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Merge branch 'for-3.11/drivers' of git://git.kernel.dk/linux-block

Browse Source 
Pull block IO driver bits from Jens Axboe:
 "As I mentioned in the core block pull request, due to real life
  circumstances the driver pull request would be late.  Now it looks
  like -rc2 late...  On the plus side, apart form the rsxx update, these
  are all things that I could argue could go in later in the cycle as
  they are fixes and not features.  So even though things are late, it's
  not ALL bad.

  The pull request contains:

   - Updates to bcache, all bug fixes, from Kent.

   - A pile of drbd bug fixes (no big features this time!).

   - xen blk front/back fixes.

   - rsxx driver updates, some of them deferred form 3.10.  So should be
     well cooked by now"

* 'for-3.11/drivers' of git://git.kernel.dk/linux-block: (63 commits)
  bcache: Allocation kthread fixes
  bcache: Fix GC_SECTORS_USED() calculation
  bcache: Journal replay fix
  bcache: Shutdown fix
  bcache: Fix a sysfs splat on shutdown
  bcache: Advertise that flushes are supported
  bcache: check for allocation failures
  bcache: Fix a dumb race
  bcache: Use standard utility code
  bcache: Update email address
  bcache: Delete fuzz tester
  bcache: Document shrinker reserve better
  bcache: FUA fixes
  drbd: Allow online change of al-stripes and al-stripe-size
  drbd: Constants should be UPPERCASE
  drbd: Ignore the exit code of a fence-peer handler if it returns too late
  drbd: Fix rcu_read_lock balance on error path
  drbd: fix error return code in drbd_init()
  drbd: Do not sleep inside rcu
  bcache: Refresh usage docs
  ...
This commit is contained in:
Linus Torvalds 2013-07-22 19:02:52 -07:00
commit d4c90b1b9f
47 changed files with 3236 additions and 1603 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Documentation/ABI/testing/sysfs-driver-xen-blkback Normal file
View File

@ -0,0 +1,17 @@
What: /sys/module/xen_blkback/parameters/max_buffer_pages
Date: March 2013
KernelVersion: 3.11
Contact: Roger Pau Monné <roger.pau@citrix.com>
Description:
Maximum number of free pages to keep in each block
backend buffer.
What: /sys/module/xen_blkback/parameters/max_persistent_grants
Date: March 2013
KernelVersion: 3.11
Contact: Roger Pau Monné <roger.pau@citrix.com>
Description:
Maximum number of grants to map persistently in
blkback. If the frontend tries to use more than
max_persistent_grants, the LRU kicks in and starts
removing 5% of max_persistent_grants every 100ms.

10
Documentation/ABI/testing/sysfs-driver-xen-blkfront Normal file
View File

@ -0,0 +1,10 @@
What: /sys/module/xen_blkfront/parameters/max
Date: June 2013
KernelVersion: 3.11
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Maximum number of segments that the frontend will negotiate
with the backend for indirect descriptors. The default value
is 32 - higher value means more potential throughput but more
memory usage. The backend picks the minimum of the frontend
and its default backend value.

37
Documentation/bcache.txt
View File

@ -46,29 +46,33 @@ you format your backing devices and cache device at the same time, you won't
have to manually attach:
make-bcache -B /dev/sda /dev/sdb -C /dev/sdc
To make bcache devices known to the kernel, echo them to /sys/fs/bcache/register:
bcache-tools now ships udev rules, and bcache devices are known to the kernel
immediately. Without udev, you can manually register devices like this:
echo /dev/sdb > /sys/fs/bcache/register
echo /dev/sdc > /sys/fs/bcache/register
To register your bcache devices automatically, you could add something like
this to an init script:
Registering the backing device makes the bcache device show up in /dev; you can
now format it and use it as normal. But the first time using a new bcache
device, it'll be running in passthrough mode until you attach it to a cache.
See the section on attaching.
echo /dev/sd* > /sys/fs/bcache/register_quiet
The devices show up as:
It'll look for bcache superblocks and ignore everything that doesn't have one.
/dev/bcache<N>
Registering the backing device makes the bcache show up in /dev; you can now
format it and use it as normal. But the first time using a new bcache device,
it'll be running in passthrough mode until you attach it to a cache. See the
section on attaching.
As well as (with udev):
The devices show up at /dev/bcacheN, and can be controlled via sysfs from
/sys/block/bcacheN/bcache:
/dev/bcache/by-uuid/<uuid>
/dev/bcache/by-label/<label>
To get started:
mkfs.ext4 /dev/bcache0
mount /dev/bcache0 /mnt
You can control bcache devices through sysfs at /sys/block/bcache<N>/bcache .
Cache devices are managed as sets; multiple caches per set isn't supported yet
but will allow for mirroring of metadata and dirty data in the future. Your new
cache set shows up as /sys/fs/bcache/<UUID>
@ -80,11 +84,11 @@ must be attached to your cache set to enable caching. Attaching a backing
device to a cache set is done thusly, with the UUID of the cache set in
/sys/fs/bcache:
echo <UUID> > /sys/block/bcache0/bcache/attach
echo <CSET-UUID> > /sys/block/bcache0/bcache/attach
This only has to be done once. The next time you reboot, just reregister all
your bcache devices. If a backing device has data in a cache somewhere, the
/dev/bcache# device won't be created until the cache shows up - particularly
/dev/bcache<N> device won't be created until the cache shows up - particularly
important if you have writeback caching turned on.
If you're booting up and your cache device is gone and never coming back, you
@ -191,6 +195,9 @@ want for getting the best possible numbers when benchmarking.
SYSFS - BACKING DEVICE:
Available at /sys/block/<bdev>/bcache, /sys/block/bcache*/bcache and
(if attached) /sys/fs/bcache/<cset-uuid>/bdev*
attach
Echo the UUID of a cache set to this file to enable caching.
@ -300,6 +307,8 @@ cache_readaheads
SYSFS - CACHE SET:
Available at /sys/fs/bcache/<cset-uuid>
average_key_size
Average data per key in the btree.
@ -390,6 +399,8 @@ trigger_gc
SYSFS - CACHE DEVICE:
Available at /sys/block/<cdev>/bcache
block_size
Minimum granularity of writes - should match hardware sector size.

4
MAINTAINERS
View File

@ -1642,7 +1642,7 @@ S: Maintained
F: drivers/net/hamradio/baycom*
BCACHE (BLOCK LAYER CACHE)
M: Kent Overstreet <koverstreet@google.com>
M: Kent Overstreet <kmo@daterainc.com>
L: linux-bcache@vger.kernel.org
W: http://bcache.evilpiepirate.org
S: Maintained:
@ -3346,7 +3346,7 @@ F: Documentation/firmware_class/
F: drivers/base/firmware*.c
F: include/linux/firmware.h
FLASHSYSTEM DRIVER (IBM FlashSystem 70/80 PCI SSD Flash Card)
FLASH ADAPTER DRIVER (IBM Flash Adapter 900GB Full Height PCI Flash Card)
M: Joshua Morris <josh.h.morris@us.ibm.com>
M: Philip Kelleher <pjk1939@linux.vnet.ibm.com>
S: Maintained

4
drivers/block/Kconfig
View File

@ -532,11 +532,11 @@ config BLK_DEV_RBD
If unsure, say N.
config BLK_DEV_RSXX
tristate "IBM FlashSystem 70/80 PCIe SSD Device Driver"
tristate "IBM Flash Adapter 900GB Full Height PCIe Device Driver"
depends on PCI
help
Device driver for IBM's high speed PCIe SSD
storage devices: FlashSystem-70 and FlashSystem-80.
storage device: Flash Adapter 900GB Full Height.
To compile this driver as a module, choose M here: the
module will be called rsxx.

21
drivers/block/drbd/drbd_actlog.c
View File

@ -659,6 +659,27 @@ void drbd_al_shrink(struct drbd_conf *mdev)
wake_up(&mdev->al_wait);
}
int drbd_initialize_al(struct drbd_conf *mdev, void *buffer)
{
struct al_transaction_on_disk *al = buffer;
struct drbd_md *md = &mdev->ldev->md;
sector_t al_base = md->md_offset + md->al_offset;
int al_size_4k = md->al_stripes * md->al_stripe_size_4k;
int i;
memset(al, 0, 4096);
al->magic = cpu_to_be32(DRBD_AL_MAGIC);
al->transaction_type = cpu_to_be16(AL_TR_INITIALIZED);
al->crc32c = cpu_to_be32(crc32c(0, al, 4096));
for (i = 0; i < al_size_4k; i++) {
int err = drbd_md_sync_page_io(mdev, mdev->ldev, al_base + i * 8, WRITE);
if (err)
return err;
}
return 0;
}
static int w_update_odbm(struct drbd_work *w, int unused)
{
struct update_odbm_work *udw = container_of(w, struct update_odbm_work, w);

15
drivers/block/drbd/drbd_int.h
View File

@ -832,6 +832,7 @@ struct drbd_tconn { /* is a resource from the config file */
unsigned susp_nod:1; /* IO suspended because no data */
unsigned susp_fen:1; /* IO suspended because fence peer handler runs */
struct mutex cstate_mutex; /* Protects graceful disconnects */
unsigned int connect_cnt; /* Inc each time a connection is established */
unsigned long flags;
struct net_conf *net_conf; /* content protected by rcu */
@ -1132,6 +1133,7 @@ extern void drbd_mdev_cleanup(struct drbd_conf *mdev);
void drbd_print_uuids(struct drbd_conf *mdev, const char *text);
extern void conn_md_sync(struct drbd_tconn *tconn);
extern void drbd_md_write(struct drbd_conf *mdev, void *buffer);
extern void drbd_md_sync(struct drbd_conf *mdev);
extern int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev);
extern void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local);
@ -1466,8 +1468,16 @@ extern void drbd_suspend_io(struct drbd_conf *mdev);
extern void drbd_resume_io(struct drbd_conf *mdev);
extern char *ppsize(char *buf, unsigned long long size);
extern sector_t drbd_new_dev_size(struct drbd_conf *, struct drbd_backing_dev *, sector_t, int);
enum determine_dev_size { dev_size_error = -1, unchanged = 0, shrunk = 1, grew = 2 };
extern enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *, enum dds_flags) __must_hold(local);
enum determine_dev_size {
DS_ERROR_SHRINK = -3,
DS_ERROR_SPACE_MD = -2,
DS_ERROR = -1,
DS_UNCHANGED = 0,
DS_SHRUNK = 1,
DS_GREW = 2
};
extern enum determine_dev_size
drbd_determine_dev_size(struct drbd_conf *, enum dds_flags, struct resize_parms *) __must_hold(local);
extern void resync_after_online_grow(struct drbd_conf *);
extern void drbd_reconsider_max_bio_size(struct drbd_conf *mdev);
extern enum drbd_state_rv drbd_set_role(struct drbd_conf *mdev,
@ -1633,6 +1643,7 @@ extern int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector,
#define drbd_set_out_of_sync(mdev, sector, size) \
__drbd_set_out_of_sync(mdev, sector, size, __FILE__, __LINE__)
extern void drbd_al_shrink(struct drbd_conf *mdev);
extern int drbd_initialize_al(struct drbd_conf *, void *);
/* drbd_nl.c */
/* state info broadcast */

61
drivers/block/drbd/drbd_main.c
View File

@ -2762,8 +2762,6 @@ int __init drbd_init(void)
/*
* allocate all necessary structs
*/
err = -ENOMEM;
init_waitqueue_head(&drbd_pp_wait);
drbd_proc = NULL; /* play safe for drbd_cleanup */
@ -2773,6 +2771,7 @@ int __init drbd_init(void)
if (err)
goto fail;
err = -ENOMEM;
drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
if (!drbd_proc) {
printk(KERN_ERR "drbd: unable to register proc file\n");
@ -2803,7 +2802,6 @@ int __init drbd_init(void)
fail:
drbd_cleanup();
if (err == -ENOMEM)
/* currently always the case */
printk(KERN_ERR "drbd: ran out of memory\n");
else
printk(KERN_ERR "drbd: initialization failure\n");
@ -2881,34 +2879,14 @@ struct meta_data_on_disk {
u8 reserved_u8[4096 - (7*8 + 10*4)];
} __packed;
/**
* drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
* @mdev: DRBD device.
*/
void drbd_md_sync(struct drbd_conf *mdev)
void drbd_md_write(struct drbd_conf *mdev, void *b)
{
struct meta_data_on_disk *buffer;
struct meta_data_on_disk *buffer = b;
sector_t sector;
int i;
/* Don't accidentally change the DRBD meta data layout. */
BUILD_BUG_ON(UI_SIZE != 4);
BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096);
del_timer(&mdev->md_sync_timer);
/* timer may be rearmed by drbd_md_mark_dirty() now. */
if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
return;
/* We use here D_FAILED and not D_ATTACHING because we try to write
* metadata even if we detach due to a disk failure! */
if (!get_ldev_if_state(mdev, D_FAILED))
return;
buffer = drbd_md_get_buffer(mdev);
if (!buffer)
goto out;
memset(buffer, 0, sizeof(*buffer));
buffer->la_size_sect = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
@ -2937,6 +2915,35 @@ void drbd_md_sync(struct drbd_conf *mdev)
dev_err(DEV, "meta data update failed!\n");
drbd_chk_io_error(mdev, 1, DRBD_META_IO_ERROR);
}
}
/**
* drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
* @mdev: DRBD device.
*/
void drbd_md_sync(struct drbd_conf *mdev)
{
struct meta_data_on_disk *buffer;
/* Don't accidentally change the DRBD meta data layout. */
BUILD_BUG_ON(UI_SIZE != 4);
BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096);
del_timer(&mdev->md_sync_timer);
/* timer may be rearmed by drbd_md_mark_dirty() now. */
if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
return;
/* We use here D_FAILED and not D_ATTACHING because we try to write
* metadata even if we detach due to a disk failure! */
if (!get_ldev_if_state(mdev, D_FAILED))
return;
buffer = drbd_md_get_buffer(mdev);
if (!buffer)
goto out;
drbd_md_write(mdev, buffer);
/* Update mdev->ldev->md.la_size_sect,
* since we updated it on metadata. */

185
drivers/block/drbd/drbd_nl.c
View File

@ -417,6 +417,7 @@ static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
bool conn_try_outdate_peer(struct drbd_tconn *tconn)
{
unsigned int connect_cnt;
union drbd_state mask = { };
union drbd_state val = { };
enum drbd_fencing_p fp;
@ -428,6 +429,10 @@ bool conn_try_outdate_peer(struct drbd_tconn *tconn)
return false;
}
spin_lock_irq(&tconn->req_lock);
connect_cnt = tconn->connect_cnt;
spin_unlock_irq(&tconn->req_lock);
fp = highest_fencing_policy(tconn);
switch (fp) {
case FP_NOT_AVAIL:
@ -492,8 +497,14 @@ bool conn_try_outdate_peer(struct drbd_tconn *tconn)
here, because we might were able to re-establish the connection in the
meantime. */
spin_lock_irq(&tconn->req_lock);
if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags))
_conn_request_state(tconn, mask, val, CS_VERBOSE);
if (tconn->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &tconn->flags)) {
if (tconn->connect_cnt != connect_cnt)
/* In case the connection was established and droped
while the fence-peer handler was running, ignore it */
conn_info(tconn, "Ignoring fence-peer exit code\n");
else
_conn_request_state(tconn, mask, val, CS_VERBOSE);
}
spin_unlock_irq(&tconn->req_lock);
return conn_highest_pdsk(tconn) <= D_OUTDATED;
@ -816,15 +827,20 @@ void drbd_resume_io(struct drbd_conf *mdev)
* Returns 0 on success, negative return values indicate errors.
* You should call drbd_md_sync() after calling this function.
*/
enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
enum determine_dev_size
drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags, struct resize_parms *rs) __must_hold(local)
{
sector_t prev_first_sect, prev_size; /* previous meta location */
sector_t la_size_sect, u_size;
struct drbd_md *md = &mdev->ldev->md;
u32 prev_al_stripe_size_4k;
u32 prev_al_stripes;
sector_t size;
char ppb[10];
void *buffer;
int md_moved, la_size_changed;
enum determine_dev_size rv = unchanged;
enum determine_dev_size rv = DS_UNCHANGED;
/* race:
* application request passes inc_ap_bio,
@ -836,6 +852,11 @@ enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds
* still lock the act_log to not trigger ASSERTs there.
*/
drbd_suspend_io(mdev);
buffer = drbd_md_get_buffer(mdev); /* Lock meta-data IO */
if (!buffer) {
drbd_resume_io(mdev);
return DS_ERROR;
}
/* no wait necessary anymore, actually we could assert that */
wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
@ -844,7 +865,17 @@ enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds
prev_size = mdev->ldev->md.md_size_sect;
la_size_sect = mdev->ldev->md.la_size_sect;
/* TODO: should only be some assert here, not (re)init... */
if (rs) {
/* rs is non NULL if we should change the AL layout only */
prev_al_stripes = md->al_stripes;
prev_al_stripe_size_4k = md->al_stripe_size_4k;
md->al_stripes = rs->al_stripes;
md->al_stripe_size_4k = rs->al_stripe_size / 4;
md->al_size_4k = (u64)rs->al_stripes * rs->al_stripe_size / 4;
}
drbd_md_set_sector_offsets(mdev, mdev->ldev);
rcu_read_lock();
@ -852,6 +883,21 @@ enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds
rcu_read_unlock();
size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
if (size < la_size_sect) {
if (rs && u_size == 0) {
/* Remove "rs &&" later. This check should always be active, but
right now the receiver expects the permissive behavior */
dev_warn(DEV, "Implicit shrink not allowed. "
"Use --size=%llus for explicit shrink.\n",
(unsigned long long)size);
rv = DS_ERROR_SHRINK;
}
if (u_size > size)
rv = DS_ERROR_SPACE_MD;
if (rv != DS_UNCHANGED)
goto err_out;
}
if (drbd_get_capacity(mdev->this_bdev) != size ||
drbd_bm_capacity(mdev) != size) {
int err;
@ -867,7 +913,7 @@ enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds
"Leaving size unchanged at size = %lu KB\n",
(unsigned long)size);
}
rv = dev_size_error;
rv = DS_ERROR;
}
/* racy, see comments above. */
drbd_set_my_capacity(mdev, size);
@ -875,38 +921,57 @@ enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds
dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
(unsigned long long)size>>1);
}
if (rv == dev_size_error)
goto out;
if (rv <= DS_ERROR)
goto err_out;
la_size_changed = (la_size_sect != mdev->ldev->md.la_size_sect);
md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
|| prev_size != mdev->ldev->md.md_size_sect;
if (la_size_changed || md_moved) {
int err;
if (la_size_changed || md_moved || rs) {
u32 prev_flags;
drbd_al_shrink(mdev); /* All extents inactive. */
prev_flags = md->flags;
md->flags &= ~MDF_PRIMARY_IND;
drbd_md_write(mdev, buffer);
dev_info(DEV, "Writing the whole bitmap, %s\n",
la_size_changed && md_moved ? "size changed and md moved" :
la_size_changed ? "size changed" : "md moved");
/* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
err = drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
"size changed", BM_LOCKED_MASK);
if (err) {
rv = dev_size_error;
goto out;
}
drbd_md_mark_dirty(mdev);
drbd_bitmap_io(mdev, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
"size changed", BM_LOCKED_MASK);
drbd_initialize_al(mdev, buffer);
md->flags = prev_flags;
drbd_md_write(mdev, buffer);
if (rs)
dev_info(DEV, "Changed AL layout to al-stripes = %d, al-stripe-size-kB = %d\n",
md->al_stripes, md->al_stripe_size_4k * 4);
}
if (size > la_size_sect)
rv = grew;
rv = DS_GREW;
if (size < la_size_sect)
rv = shrunk;
out:
rv = DS_SHRUNK;
if (0) {
err_out:
if (rs) {
md->al_stripes = prev_al_stripes;
md->al_stripe_size_4k = prev_al_stripe_size_4k;
md->al_size_4k = (u64)prev_al_stripes * prev_al_stripe_size_4k;
drbd_md_set_sector_offsets(mdev, mdev->ldev);
}
}
lc_unlock(mdev->act_log);
wake_up(&mdev->al_wait);
drbd_md_put_buffer(mdev);
drbd_resume_io(mdev);
return rv;
@ -1607,11 +1672,11 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
!drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
set_bit(USE_DEGR_WFC_T, &mdev->flags);
dd = drbd_determine_dev_size(mdev, 0);
if (dd == dev_size_error) {
dd = drbd_determine_dev_size(mdev, 0, NULL);
if (dd <= DS_ERROR) {
retcode = ERR_NOMEM_BITMAP;
goto force_diskless_dec;
} else if (dd == grew)
} else if (dd == DS_GREW)
set_bit(RESYNC_AFTER_NEG, &mdev->flags);
if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) ||
@ -2305,6 +2370,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
struct drbd_conf *mdev;
enum drbd_ret_code retcode;
enum determine_dev_size dd;
bool change_al_layout = false;
enum dds_flags ddsf;
sector_t u_size;
int err;
@ -2315,31 +2381,33 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
if (retcode != NO_ERROR)
goto fail;
mdev = adm_ctx.mdev;
if (!get_ldev(mdev)) {
retcode = ERR_NO_DISK;
goto fail;
}
memset(&rs, 0, sizeof(struct resize_parms));
rs.al_stripes = mdev->ldev->md.al_stripes;
rs.al_stripe_size = mdev->ldev->md.al_stripe_size_4k * 4;
if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
err = resize_parms_from_attrs(&rs, info);
if (err) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(from_attrs_err_to_txt(err));
goto fail;
goto fail_ldev;
}
}
mdev = adm_ctx.mdev;
if (mdev->state.conn > C_CONNECTED) {
retcode = ERR_RESIZE_RESYNC;
goto fail;
goto fail_ldev;
}
if (mdev->state.role == R_SECONDARY &&
mdev->state.peer == R_SECONDARY) {
retcode = ERR_NO_PRIMARY;
goto fail;
}
if (!get_ldev(mdev)) {
retcode = ERR_NO_DISK;
goto fail;
goto fail_ldev;
}
if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
@ -2358,6 +2426,28 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
}
}
if (mdev->ldev->md.al_stripes != rs.al_stripes ||
mdev->ldev->md.al_stripe_size_4k != rs.al_stripe_size / 4) {
u32 al_size_k = rs.al_stripes * rs.al_stripe_size;
if (al_size_k > (16 * 1024 * 1024)) {
retcode = ERR_MD_LAYOUT_TOO_BIG;
goto fail_ldev;
}
if (al_size_k < MD_32kB_SECT/2) {
retcode = ERR_MD_LAYOUT_TOO_SMALL;
goto fail_ldev;
}
if (mdev->state.conn != C_CONNECTED) {
retcode = ERR_MD_LAYOUT_CONNECTED;
goto fail_ldev;
}
change_al_layout = true;
}
if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
@ -2373,16 +2463,22 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
}
ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
dd = drbd_determine_dev_size(mdev, ddsf);
dd = drbd_determine_dev_size(mdev, ddsf, change_al_layout ? &rs : NULL);
drbd_md_sync(mdev);
put_ldev(mdev);
if (dd == dev_size_error) {
if (dd == DS_ERROR) {
retcode = ERR_NOMEM_BITMAP;
goto fail;
} else if (dd == DS_ERROR_SPACE_MD) {
retcode = ERR_MD_LAYOUT_NO_FIT;
goto fail;
} else if (dd == DS_ERROR_SHRINK) {
retcode = ERR_IMPLICIT_SHRINK;
goto fail;
}
if (mdev->state.conn == C_CONNECTED) {
if (dd == grew)
if (dd == DS_GREW)
set_bit(RESIZE_PENDING, &mdev->flags);
drbd_send_uuids(mdev);
@ -2658,7 +2754,6 @@ int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
const struct sib_info *sib)
{
struct state_info *si = NULL; /* for sizeof(si->member); */
struct net_conf *nc;
struct nlattr *nla;
int got_ldev;
int err = 0;
@ -2688,13 +2783,19 @@ int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
goto nla_put_failure;
rcu_read_lock();
if (got_ldev)
if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
goto nla_put_failure;
if (got_ldev) {
struct disk_conf *disk_conf;
nc = rcu_dereference(mdev->tconn->net_conf);
if (nc)
err = net_conf_to_skb(skb, nc, exclude_sensitive);
disk_conf = rcu_dereference(mdev->ldev->disk_conf);
err = disk_conf_to_skb(skb, disk_conf, exclude_sensitive);
}
if (!err) {
struct net_conf *nc;
nc = rcu_dereference(mdev->tconn->net_conf);
if (nc)
err = net_conf_to_skb(skb, nc, exclude_sensitive);
}
rcu_read_unlock();
if (err)
goto nla_put_failure;

12
drivers/block/drbd/drbd_receiver.c
View File

@ -1039,6 +1039,8 @@ randomize:
rcu_read_lock();
idr_for_each_entry(&tconn->volumes, mdev, vnr) {
kref_get(&mdev->kref);
rcu_read_unlock();
/* Prevent a race between resync-handshake and
* being promoted to Primary.
*
@ -1049,8 +1051,6 @@ randomize:
mutex_lock(mdev->state_mutex);
mutex_unlock(mdev->state_mutex);
rcu_read_unlock();
if (discard_my_data)
set_bit(DISCARD_MY_DATA, &mdev->flags);
else
@ -3545,7 +3545,7 @@ static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi)
{
struct drbd_conf *mdev;
struct p_sizes *p = pi->data;
enum determine_dev_size dd = unchanged;
enum determine_dev_size dd = DS_UNCHANGED;
sector_t p_size, p_usize, my_usize;
int ldsc = 0; /* local disk size changed */
enum dds_flags ddsf;
@ -3617,9 +3617,9 @@ static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi)
ddsf = be16_to_cpu(p->dds_flags);
if (get_ldev(mdev)) {
dd = drbd_determine_dev_size(mdev, ddsf);
dd = drbd_determine_dev_size(mdev, ddsf, NULL);
put_ldev(mdev);
if (dd == dev_size_error)
if (dd == DS_ERROR)
return -EIO;
drbd_md_sync(mdev);
} else {
@ -3647,7 +3647,7 @@ static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi)
drbd_send_sizes(mdev, 0, ddsf);
}
if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) ||
(dd == grew && mdev->state.conn == C_CONNECTED)) {
(dd == DS_GREW && mdev->state.conn == C_CONNECTED)) {
if (mdev->state.pdsk >= D_INCONSISTENT &&
mdev->state.disk >= D_INCONSISTENT) {
if (ddsf & DDSF_NO_RESYNC)

4
drivers/block/drbd/drbd_state.c
View File

@ -1115,8 +1115,10 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
drbd_thread_restart_nowait(&mdev->tconn->receiver);
/* Resume AL writing if we get a connection */
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
drbd_resume_al(mdev);
mdev->tconn->connect_cnt++;
}
/* remember last attach time so request_timer_fn() won't
* kill newly established sessions while we are still trying to thaw

359
drivers/block/rsxx/core.c
View File

@ -31,6 +31,8 @@
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/genhd.h>
#include <linux/idr.h>
@ -39,8 +41,9 @@
#include "rsxx_cfg.h"
#define NO_LEGACY 0
#define SYNC_START_TIMEOUT (10 * 60) /* 10 minutes */
MODULE_DESCRIPTION("IBM FlashSystem 70/80 PCIe SSD Device Driver");
MODULE_DESCRIPTION("IBM Flash Adapter 900GB Full Height Device Driver");
MODULE_AUTHOR("Joshua Morris/Philip Kelleher, IBM");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);
@ -49,9 +52,282 @@ static unsigned int force_legacy = NO_LEGACY;
module_param(force_legacy, uint, 0444);
MODULE_PARM_DESC(force_legacy, "Force the use of legacy type PCI interrupts");
static unsigned int sync_start = 1;
module_param(sync_start, uint, 0444);
MODULE_PARM_DESC(sync_start, "On by Default: Driver load will not complete "
"until the card startup has completed.");
static DEFINE_IDA(rsxx_disk_ida);
static DEFINE_SPINLOCK(rsxx_ida_lock);
/* --------------------Debugfs Setup ------------------- */
struct rsxx_cram {
u32 f_pos;
u32 offset;
void *i_private;
};
static int rsxx_attr_pci_regs_show(struct seq_file *m, void *p)
{
struct rsxx_cardinfo *card = m->private;
seq_printf(m, "HWID 0x%08x\n",
ioread32(card->regmap + HWID));
seq_printf(m, "SCRATCH 0x%08x\n",
ioread32(card->regmap + SCRATCH));
seq_printf(m, "IER 0x%08x\n",
ioread32(card->regmap + IER));
seq_printf(m, "IPR 0x%08x\n",
ioread32(card->regmap + IPR));
seq_printf(m, "CREG_CMD 0x%08x\n",
ioread32(card->regmap + CREG_CMD));
seq_printf(m, "CREG_ADD 0x%08x\n",
ioread32(card->regmap + CREG_ADD));
seq_printf(m, "CREG_CNT 0x%08x\n",
ioread32(card->regmap + CREG_CNT));
seq_printf(m, "CREG_STAT 0x%08x\n",
ioread32(card->regmap + CREG_STAT));
seq_printf(m, "CREG_DATA0 0x%08x\n",
ioread32(card->regmap + CREG_DATA0));
seq_printf(m, "CREG_DATA1 0x%08x\n",
ioread32(card->regmap + CREG_DATA1));
seq_printf(m, "CREG_DATA2 0x%08x\n",
ioread32(card->regmap + CREG_DATA2));
seq_printf(m, "CREG_DATA3 0x%08x\n",
ioread32(card->regmap + CREG_DATA3));
seq_printf(m, "CREG_DATA4 0x%08x\n",
ioread32(card->regmap + CREG_DATA4));
seq_printf(m, "CREG_DATA5 0x%08x\n",
ioread32(card->regmap + CREG_DATA5));
seq_printf(m, "CREG_DATA6 0x%08x\n",
ioread32(card->regmap + CREG_DATA6));
seq_printf(m, "CREG_DATA7 0x%08x\n",
ioread32(card->regmap + CREG_DATA7));
seq_printf(m, "INTR_COAL 0x%08x\n",
ioread32(card->regmap + INTR_COAL));
seq_printf(m, "HW_ERROR 0x%08x\n",
ioread32(card->regmap + HW_ERROR));
seq_printf(m, "DEBUG0 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG0));
seq_printf(m, "DEBUG1 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG1));
seq_printf(m, "DEBUG2 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG2));
seq_printf(m, "DEBUG3 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG3));
seq_printf(m, "DEBUG4 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG4));
seq_printf(m, "DEBUG5 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG5));
seq_printf(m, "DEBUG6 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG6));
seq_printf(m, "DEBUG7 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG7));
seq_printf(m, "RECONFIG 0x%08x\n",
ioread32(card->regmap + PCI_RECONFIG));
return 0;
}
static int rsxx_attr_stats_show(struct seq_file *m, void *p)
{
struct rsxx_cardinfo *card = m->private;
int i;
for (i = 0; i < card->n_targets; i++) {
seq_printf(m, "Ctrl %d CRC Errors = %d\n",
i, card->ctrl[i].stats.crc_errors);
seq_printf(m, "Ctrl %d Hard Errors = %d\n",
i, card->ctrl[i].stats.hard_errors);
seq_printf(m, "Ctrl %d Soft Errors = %d\n",
i, card->ctrl[i].stats.soft_errors);
seq_printf(m, "Ctrl %d Writes Issued = %d\n",
i, card->ctrl[i].stats.writes_issued);
seq_printf(m, "Ctrl %d Writes Failed = %d\n",
i, card->ctrl[i].stats.writes_failed);
seq_printf(m, "Ctrl %d Reads Issued = %d\n",
i, card->ctrl[i].stats.reads_issued);
seq_printf(m, "Ctrl %d Reads Failed = %d\n",
i, card->ctrl[i].stats.reads_failed);
seq_printf(m, "Ctrl %d Reads Retried = %d\n",
i, card->ctrl[i].stats.reads_retried);
seq_printf(m, "Ctrl %d Discards Issued = %d\n",
i, card->ctrl[i].stats.discards_issued);
seq_printf(m, "Ctrl %d Discards Failed = %d\n",
i, card->ctrl[i].stats.discards_failed);
seq_printf(m, "Ctrl %d DMA SW Errors = %d\n",
i, card->ctrl[i].stats.dma_sw_err);
seq_printf(m, "Ctrl %d DMA HW Faults = %d\n",
i, card->ctrl[i].stats.dma_hw_fault);
seq_printf(m, "Ctrl %d DMAs Cancelled = %d\n",
i, card->ctrl[i].stats.dma_cancelled);
seq_printf(m, "Ctrl %d SW Queue Depth = %d\n",
i, card->ctrl[i].stats.sw_q_depth);
seq_printf(m, "Ctrl %d HW Queue Depth = %d\n",
i, atomic_read(&card->ctrl[i].stats.hw_q_depth));
}
return 0;
}
static int rsxx_attr_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, rsxx_attr_stats_show, inode->i_private);
}
static int rsxx_attr_pci_regs_open(struct inode *inode, struct file *file)
{
return single_open(file, rsxx_attr_pci_regs_show, inode->i_private);
}
static ssize_t rsxx_cram_read(struct file *fp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct rsxx_cram *info = fp->private_data;
struct rsxx_cardinfo *card = info->i_private;
char *buf;
int st;
buf = kzalloc(sizeof(*buf) * cnt, GFP_KERNEL);
if (!buf)
return -ENOMEM;
info->f_pos = (u32)*ppos + info->offset;
st = rsxx_creg_read(card, CREG_ADD_CRAM + info->f_pos, cnt, buf, 1);
if (st)
return st;
st = copy_to_user(ubuf, buf, cnt);
if (st)
return st;
info->offset += cnt;
kfree(buf);
return cnt;
}
static ssize_t rsxx_cram_write(struct file *fp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct rsxx_cram *info = fp->private_data;
struct rsxx_cardinfo *card = info->i_private;
char *buf;
int st;
buf = kzalloc(sizeof(*buf) * cnt, GFP_KERNEL);
if (!buf)
return -ENOMEM;
st = copy_from_user(buf, ubuf, cnt);
if (st)
return st;
info->f_pos = (u32)*ppos + info->offset;
st = rsxx_creg_write(card, CREG_ADD_CRAM + info->f_pos, cnt, buf, 1);
if (st)
return st;
info->offset += cnt;
kfree(buf);
return cnt;
}
static int rsxx_cram_open(struct inode *inode, struct file *file)
{
struct rsxx_cram *info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->i_private = inode->i_private;
info->f_pos = file->f_pos;
file->private_data = info;
return 0;
}
static int rsxx_cram_release(struct inode *inode, struct file *file)
{
struct rsxx_cram *info = file->private_data;
if (!info)
return 0;
kfree(info);
file->private_data = NULL;
return 0;
}
static const struct file_operations debugfs_cram_fops = {
.owner = THIS_MODULE,
.open = rsxx_cram_open,
.read = rsxx_cram_read,
.write = rsxx_cram_write,
.release = rsxx_cram_release,
};
static const struct file_operations debugfs_stats_fops = {
.owner = THIS_MODULE,
.open = rsxx_attr_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations debugfs_pci_regs_fops = {
.owner = THIS_MODULE,
.open = rsxx_attr_pci_regs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void rsxx_debugfs_dev_new(struct rsxx_cardinfo *card)
{
struct dentry *debugfs_stats;
struct dentry *debugfs_pci_regs;
struct dentry *debugfs_cram;
card->debugfs_dir = debugfs_create_dir(card->gendisk->disk_name, NULL);
if (IS_ERR_OR_NULL(card->debugfs_dir))
goto failed_debugfs_dir;
debugfs_stats = debugfs_create_file("stats", S_IRUGO,
card->debugfs_dir, card,
&debugfs_stats_fops);
if (IS_ERR_OR_NULL(debugfs_stats))
goto failed_debugfs_stats;
debugfs_pci_regs = debugfs_create_file("pci_regs", S_IRUGO,
card->debugfs_dir, card,
&debugfs_pci_regs_fops);
if (IS_ERR_OR_NULL(debugfs_pci_regs))
goto failed_debugfs_pci_regs;
debugfs_cram = debugfs_create_file("cram", S_IRUGO | S_IWUSR,
card->debugfs_dir, card,
&debugfs_cram_fops);
if (IS_ERR_OR_NULL(debugfs_cram))
goto failed_debugfs_cram;
return;
failed_debugfs_cram:
debugfs_remove(debugfs_pci_regs);
failed_debugfs_pci_regs:
debugfs_remove(debugfs_stats);
failed_debugfs_stats:
debugfs_remove(card->debugfs_dir);
failed_debugfs_dir:
card->debugfs_dir = NULL;
}
/*----------------- Interrupt Control & Handling -------------------*/
static void rsxx_mask_interrupts(struct rsxx_cardinfo *card)
@ -163,12 +439,13 @@ static irqreturn_t rsxx_isr(int irq, void *pdata)
}
if (isr & CR_INTR_CREG) {
schedule_work(&card->creg_ctrl.done_work);
queue_work(card->creg_ctrl.creg_wq,
&card->creg_ctrl.done_work);
handled++;
}
if (isr & CR_INTR_EVENT) {
schedule_work(&card->event_work);
queue_work(card->event_wq, &card->event_work);
rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
handled++;
}
@ -329,7 +606,7 @@ static int rsxx_eeh_frozen(struct pci_dev *dev)
int i;
int st;
dev_warn(&dev->dev, "IBM FlashSystem PCI: preparing for slot reset.\n");
dev_warn(&dev->dev, "IBM Flash Adapter PCI: preparing for slot reset.\n");
card->eeh_state = 1;
rsxx_mask_interrupts(card);
@ -367,15 +644,26 @@ static void rsxx_eeh_failure(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
int i;
int cnt = 0;
dev_err(&dev->dev, "IBM FlashSystem PCI: disabling failed card.\n");
dev_err(&dev->dev, "IBM Flash Adapter PCI: disabling failed card.\n");
card->eeh_state = 1;
card->halt = 1;
for (i = 0; i < card->n_targets; i++)
del_timer_sync(&card->ctrl[i].activity_timer);
for (i = 0; i < card->n_targets; i++) {
spin_lock_bh(&card->ctrl[i].queue_lock);
cnt = rsxx_cleanup_dma_queue(&card->ctrl[i],
&card->ctrl[i].queue);
spin_unlock_bh(&card->ctrl[i].queue_lock);
rsxx_eeh_cancel_dmas(card);
cnt += rsxx_dma_cancel(&card->ctrl[i]);
if (cnt)
dev_info(CARD_TO_DEV(card),
"Freed %d queued DMAs on channel %d\n",
cnt, card->ctrl[i].id);
}
}
static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
@ -432,7 +720,7 @@ static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
int st;
dev_warn(&dev->dev,
"IBM FlashSystem PCI: recovering from slot reset.\n");
"IBM Flash Adapter PCI: recovering from slot reset.\n");
st = pci_enable_device(dev);
if (st)
@ -485,7 +773,7 @@ static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
&card->ctrl[i].issue_dma_work);
}
dev_info(&dev->dev, "IBM FlashSystem PCI: recovery complete.\n");
dev_info(&dev->dev, "IBM Flash Adapter PCI: recovery complete.\n");
return PCI_ERS_RESULT_RECOVERED;
@ -528,6 +816,7 @@ static int rsxx_pci_probe(struct pci_dev *dev,
{
struct rsxx_cardinfo *card;
int st;
unsigned int sync_timeout;
dev_info(&dev->dev, "PCI-Flash SSD discovered\n");
@ -610,7 +899,11 @@ static int rsxx_pci_probe(struct pci_dev *dev,
}
/************* Setup Processor Command Interface *************/
rsxx_creg_setup(card);
st = rsxx_creg_setup(card);
if (st) {
dev_err(CARD_TO_DEV(card), "Failed to setup creg interface.\n");
goto failed_creg_setup;
}
spin_lock_irq(&card->irq_lock);
rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
@ -650,6 +943,12 @@ static int rsxx_pci_probe(struct pci_dev *dev,
}
/************* Setup Card Event Handler *************/
card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
if (!card->event_wq) {
dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
goto failed_event_handler;
}
INIT_WORK(&card->event_work, card_event_handler);
st = rsxx_setup_dev(card);
@ -676,6 +975,33 @@ static int rsxx_pci_probe(struct pci_dev *dev,
if (st)
dev_crit(CARD_TO_DEV(card),
"Failed issuing card startup\n");
if (sync_start) {
sync_timeout = SYNC_START_TIMEOUT;
dev_info(CARD_TO_DEV(card),
"Waiting for card to startup\n");
do {
ssleep(1);
sync_timeout--;
rsxx_get_card_state(card, &card->state);
} while (sync_timeout &&
(card->state == CARD_STATE_STARTING));
if (card->state == CARD_STATE_STARTING) {
dev_warn(CARD_TO_DEV(card),
"Card startup timed out\n");
card->size8 = 0;
} else {
dev_info(CARD_TO_DEV(card),
"card state: %s\n",
rsxx_card_state_to_str(card->state));
st = rsxx_get_card_size8(card, &card->size8);
if (st)
card->size8 = 0;
}
}
} else if (card->state == CARD_STATE_GOOD ||
card->state == CARD_STATE_RD_ONLY_FAULT) {
st = rsxx_get_card_size8(card, &card->size8);
@ -685,12 +1011,21 @@ static int rsxx_pci_probe(struct pci_dev *dev,
rsxx_attach_dev(card);
/************* Setup Debugfs *************/
rsxx_debugfs_dev_new(card);
return 0;
failed_create_dev:
destroy_workqueue(card->event_wq);
card->event_wq = NULL;
failed_event_handler:
rsxx_dma_destroy(card);
failed_dma_setup:
failed_compatiblity_check:
destroy_workqueue(card->creg_ctrl.creg_wq);
card->creg_ctrl.creg_wq = NULL;
failed_creg_setup:
spin_lock_irq(&card->irq_lock);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irq(&card->irq_lock);
@ -756,6 +1091,8 @@ static void rsxx_pci_remove(struct pci_dev *dev)
/* Prevent work_structs from re-queuing themselves. */
card->halt = 1;
debugfs_remove_recursive(card->debugfs_dir);
free_irq(dev->irq, card);
if (!force_legacy)

14
drivers/block/rsxx/cregs.c
View File

@ -431,6 +431,15 @@ static int __issue_creg_rw(struct rsxx_cardinfo *card,
*hw_stat = completion.creg_status;
if (completion.st) {
/*
* This read is needed to verify that there has not been any
* extreme errors that might have occurred, i.e. EEH. The
* function iowrite32 will not detect EEH errors, so it is
* necessary that we recover if such an error is the reason
* for the timeout. This is a dummy read.
*/
ioread32(card->regmap + SCRATCH);
dev_warn(CARD_TO_DEV(card),
"creg command failed(%d x%08x)\n",
completion.st, addr);
@ -727,6 +736,11 @@ int rsxx_creg_setup(struct rsxx_cardinfo *card)
{
card->creg_ctrl.active_cmd = NULL;
card->creg_ctrl.creg_wq =
create_singlethread_workqueue(DRIVER_NAME"_creg");
if (!card->creg_ctrl.creg_wq)
return -ENOMEM;
INIT_WORK(&card->creg_ctrl.done_work, creg_cmd_done);
mutex_init(&card->creg_ctrl.reset_lock);
INIT_LIST_HEAD(&card->creg_ctrl.queue);

33
drivers/block/rsxx/dev.c
View File

@ -155,7 +155,8 @@ static void bio_dma_done_cb(struct rsxx_cardinfo *card,
atomic_set(&meta->error, 1);
if (atomic_dec_and_test(&meta->pending_dmas)) {
disk_stats_complete(card, meta->bio, meta->start_time);
if (!card->eeh_state && card->gendisk)
disk_stats_complete(card, meta->bio, meta->start_time);
bio_endio(meta->bio, atomic_read(&meta->error) ? -EIO : 0);
kmem_cache_free(bio_meta_pool, meta);
@ -170,6 +171,12 @@ static void rsxx_make_request(struct request_queue *q, struct bio *bio)
might_sleep();
if (!card)
goto req_err;
if (bio->bi_sector + (bio->bi_size >> 9) > get_capacity(card->gendisk))
goto req_err;
if (unlikely(card->halt)) {
st = -EFAULT;
goto req_err;
@ -196,7 +203,8 @@ static void rsxx_make_request(struct request_queue *q, struct bio *bio)
atomic_set(&bio_meta->pending_dmas, 0);
bio_meta->start_time = jiffies;
disk_stats_start(card, bio);
if (!unlikely(card->halt))
disk_stats_start(card, bio);
dev_dbg(CARD_TO_DEV(card), "BIO[%c]: meta: %p addr8: x%llx size: %d\n",
bio_data_dir(bio) ? 'W' : 'R', bio_meta,
@ -225,24 +233,6 @@ static bool rsxx_discard_supported(struct rsxx_cardinfo *card)
return (pci_rev >= RSXX_DISCARD_SUPPORT);
}
static unsigned short rsxx_get_logical_block_size(
struct rsxx_cardinfo *card)
{
u32 capabilities = 0;
int st;
st = rsxx_get_card_capabilities(card, &capabilities);
if (st)
dev_warn(CARD_TO_DEV(card),
"Failed reading card capabilities register\n");
/* Earlier firmware did not have support for 512 byte accesses */
if (capabilities & CARD_CAP_SUBPAGE_WRITES)
return 512;
else
return RSXX_HW_BLK_SIZE;
}
int rsxx_attach_dev(struct rsxx_cardinfo *card)
{
mutex_lock(&card->dev_lock);
@ -305,7 +295,7 @@ int rsxx_setup_dev(struct rsxx_cardinfo *card)
return -ENOMEM;
}
blk_size = rsxx_get_logical_block_size(card);
blk_size = card->config.data.block_size;
blk_queue_make_request(card->queue, rsxx_make_request);
blk_queue_bounce_limit(card->queue, BLK_BOUNCE_ANY);
@ -347,6 +337,7 @@ void rsxx_destroy_dev(struct rsxx_cardinfo *card)
card->gendisk = NULL;
blk_cleanup_queue(card->queue);
card->queue->queuedata = NULL;
unregister_blkdev(card->major, DRIVER_NAME);
}

185
drivers/block/rsxx/dma.c
View File

@ -245,6 +245,22 @@ static void rsxx_complete_dma(struct rsxx_dma_ctrl *ctrl,
kmem_cache_free(rsxx_dma_pool, dma);
}
int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl,
struct list_head *q)
{
struct rsxx_dma *dma;
struct rsxx_dma *tmp;
int cnt = 0;
list_for_each_entry_safe(dma, tmp, q, list) {
list_del(&dma->list);
rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
cnt++;
}
return cnt;
}
static void rsxx_requeue_dma(struct rsxx_dma_ctrl *ctrl,
struct rsxx_dma *dma)
{
@ -252,9 +268,10 @@ static void rsxx_requeue_dma(struct rsxx_dma_ctrl *ctrl,
* Requeued DMAs go to the front of the queue so they are issued
* first.
*/
spin_lock(&ctrl->queue_lock);
spin_lock_bh(&ctrl->queue_lock);
ctrl->stats.sw_q_depth++;
list_add(&dma->list, &ctrl->queue);
spin_unlock(&ctrl->queue_lock);
spin_unlock_bh(&ctrl->queue_lock);
}
static void rsxx_handle_dma_error(struct rsxx_dma_ctrl *ctrl,
@ -329,6 +346,7 @@ static void rsxx_handle_dma_error(struct rsxx_dma_ctrl *ctrl,
static void dma_engine_stalled(unsigned long data)
{
struct rsxx_dma_ctrl *ctrl = (struct rsxx_dma_ctrl *)data;
int cnt;
if (atomic_read(&ctrl->stats.hw_q_depth) == 0 ||
unlikely(ctrl->card->eeh_state))
@ -349,18 +367,28 @@ static void dma_engine_stalled(unsigned long data)
"DMA channel %d has stalled, faulting interface.\n",
ctrl->id);
ctrl->card->dma_fault = 1;
/* Clean up the DMA queue */
spin_lock(&ctrl->queue_lock);
cnt = rsxx_cleanup_dma_queue(ctrl, &ctrl->queue);
spin_unlock(&ctrl->queue_lock);
cnt += rsxx_dma_cancel(ctrl);
if (cnt)
dev_info(CARD_TO_DEV(ctrl->card),
"Freed %d queued DMAs on channel %d\n",
cnt, ctrl->id);
}
}
static void rsxx_issue_dmas(struct work_struct *work)
static void rsxx_issue_dmas(struct rsxx_dma_ctrl *ctrl)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
int tag;
int cmds_pending = 0;
struct hw_cmd *hw_cmd_buf;
ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work);
hw_cmd_buf = ctrl->cmd.buf;
if (unlikely(ctrl->card->halt) ||
@ -368,22 +396,22 @@ static void rsxx_issue_dmas(struct work_struct *work)
return;
while (1) {
spin_lock(&ctrl->queue_lock);
spin_lock_bh(&ctrl->queue_lock);
if (list_empty(&ctrl->queue)) {
spin_unlock(&ctrl->queue_lock);
spin_unlock_bh(&ctrl->queue_lock);
break;
}
spin_unlock(&ctrl->queue_lock);
spin_unlock_bh(&ctrl->queue_lock);
tag = pop_tracker(ctrl->trackers);
if (tag == -1)
break;
spin_lock(&ctrl->queue_lock);
spin_lock_bh(&ctrl->queue_lock);
dma = list_entry(ctrl->queue.next, struct rsxx_dma, list);
list_del(&dma->list);
ctrl->stats.sw_q_depth--;
spin_unlock(&ctrl->queue_lock);
spin_unlock_bh(&ctrl->queue_lock);
/*
* This will catch any DMAs that slipped in right before the
@ -440,9 +468,8 @@ static void rsxx_issue_dmas(struct work_struct *work)
}
}
static void rsxx_dma_done(struct work_struct *work)
static void rsxx_dma_done(struct rsxx_dma_ctrl *ctrl)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
unsigned long flags;
u16 count;
@ -450,7 +477,6 @@ static void rsxx_dma_done(struct work_struct *work)
u8 tag;
struct hw_status *hw_st_buf;
ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work);
hw_st_buf = ctrl->status.buf;
if (unlikely(ctrl->card->halt) ||
@ -520,33 +546,32 @@ static void rsxx_dma_done(struct work_struct *work)
rsxx_enable_ier(ctrl->card, CR_INTR_DMA(ctrl->id));
spin_unlock_irqrestore(&ctrl->card->irq_lock, flags);
spin_lock(&ctrl->queue_lock);
spin_lock_bh(&ctrl->queue_lock);
if (ctrl->stats.sw_q_depth)
queue_work(ctrl->issue_wq, &ctrl->issue_dma_work);
spin_unlock(&ctrl->queue_lock);
spin_unlock_bh(&ctrl->queue_lock);
}
static int rsxx_cleanup_dma_queue(struct rsxx_cardinfo *card,
struct list_head *q)
static void rsxx_schedule_issue(struct work_struct *work)
{
struct rsxx_dma *dma;
struct rsxx_dma *tmp;
int cnt = 0;
struct rsxx_dma_ctrl *ctrl;
list_for_each_entry_safe(dma, tmp, q, list) {
list_del(&dma->list);
ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work);
if (dma->dma_addr)
pci_unmap_page(card->dev, dma->dma_addr,
get_dma_size(dma),
(dma->cmd == HW_CMD_BLK_WRITE) ?
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
kmem_cache_free(rsxx_dma_pool, dma);
cnt++;
}
mutex_lock(&ctrl->work_lock);
rsxx_issue_dmas(ctrl);
mutex_unlock(&ctrl->work_lock);
}
return cnt;
static void rsxx_schedule_done(struct work_struct *work)
{
struct rsxx_dma_ctrl *ctrl;
ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work);
mutex_lock(&ctrl->work_lock);
rsxx_dma_done(ctrl);
mutex_unlock(&ctrl->work_lock);
}
static int rsxx_queue_discard(struct rsxx_cardinfo *card,
@ -698,10 +723,10 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
for (i = 0; i < card->n_targets; i++) {
if (!list_empty(&dma_list[i])) {
spin_lock(&card->ctrl[i].queue_lock);
spin_lock_bh(&card->ctrl[i].queue_lock);
card->ctrl[i].stats.sw_q_depth += dma_cnt[i];
list_splice_tail(&dma_list[i], &card->ctrl[i].queue);
spin_unlock(&card->ctrl[i].queue_lock);
spin_unlock_bh(&card->ctrl[i].queue_lock);
queue_work(card->ctrl[i].issue_wq,
&card->ctrl[i].issue_dma_work);
@ -711,8 +736,11 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
return 0;
bvec_err:
for (i = 0; i < card->n_targets; i++)
rsxx_cleanup_dma_queue(card, &dma_list[i]);
for (i = 0; i < card->n_targets; i++) {
spin_lock_bh(&card->ctrl[i].queue_lock);
rsxx_cleanup_dma_queue(&card->ctrl[i], &dma_list[i]);
spin_unlock_bh(&card->ctrl[i].queue_lock);
}
return st;
}
@ -780,6 +808,7 @@ static int rsxx_dma_ctrl_init(struct pci_dev *dev,
spin_lock_init(&ctrl->trackers->lock);
spin_lock_init(&ctrl->queue_lock);
mutex_init(&ctrl->work_lock);
INIT_LIST_HEAD(&ctrl->queue);
setup_timer(&ctrl->activity_timer, dma_engine_stalled,
@ -793,8 +822,8 @@ static int rsxx_dma_ctrl_init(struct pci_dev *dev,
if (!ctrl->done_wq)
return -ENOMEM;
INIT_WORK(&ctrl->issue_dma_work, rsxx_issue_dmas);
INIT_WORK(&ctrl->dma_done_work, rsxx_dma_done);
INIT_WORK(&ctrl->issue_dma_work, rsxx_schedule_issue);
INIT_WORK(&ctrl->dma_done_work, rsxx_schedule_done);
st = rsxx_hw_buffers_init(dev, ctrl);
if (st)
@ -918,13 +947,30 @@ failed_dma_setup:
return st;
}
int rsxx_dma_cancel(struct rsxx_dma_ctrl *ctrl)
{
struct rsxx_dma *dma;
int i;
int cnt = 0;
/* Clean up issued DMAs */
for (i = 0; i < RSXX_MAX_OUTSTANDING_CMDS; i++) {
dma = get_tracker_dma(ctrl->trackers, i);
if (dma) {
atomic_dec(&ctrl->stats.hw_q_depth);
rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
push_tracker(ctrl->trackers, i);
cnt++;
}
}
return cnt;
}
void rsxx_dma_destroy(struct rsxx_cardinfo *card)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
int i, j;
int cnt = 0;
int i;
for (i = 0; i < card->n_targets; i++) {
ctrl = &card->ctrl[i];
@ -943,33 +989,11 @@ void rsxx_dma_destroy(struct rsxx_cardinfo *card)
del_timer_sync(&ctrl->activity_timer);
/* Clean up the DMA queue */
spin_lock(&ctrl->queue_lock);
cnt = rsxx_cleanup_dma_queue(card, &ctrl->queue);
spin_unlock(&ctrl->queue_lock);
spin_lock_bh(&ctrl->queue_lock);
rsxx_cleanup_dma_queue(ctrl, &ctrl->queue);
spin_unlock_bh(&ctrl->queue_lock);
if (cnt)
dev_info(CARD_TO_DEV(card),
"Freed %d queued DMAs on channel %d\n",
cnt, i);
/* Clean up issued DMAs */
for (j = 0; j < RSXX_MAX_OUTSTANDING_CMDS; j++) {
dma = get_tracker_dma(ctrl->trackers, j);
if (dma) {
pci_unmap_page(card->dev, dma->dma_addr,
get_dma_size(dma),
(dma->cmd == HW_CMD_BLK_WRITE) ?
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
kmem_cache_free(rsxx_dma_pool, dma);
cnt++;
}
}
if (cnt)
dev_info(CARD_TO_DEV(card),
"Freed %d pending DMAs on channel %d\n",
cnt, i);
rsxx_dma_cancel(ctrl);
vfree(ctrl->trackers);
@ -1013,7 +1037,7 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
cnt++;
}
spin_lock(&card->ctrl[i].queue_lock);
spin_lock_bh(&card->ctrl[i].queue_lock);
list_splice(&issued_dmas[i], &card->ctrl[i].queue);
atomic_sub(cnt, &card->ctrl[i].stats.hw_q_depth);
@ -1028,7 +1052,7 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
}
spin_unlock(&card->ctrl[i].queue_lock);
spin_unlock_bh(&card->ctrl[i].queue_lock);
}
kfree(issued_dmas);
@ -1036,30 +1060,13 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
return 0;
}
void rsxx_eeh_cancel_dmas(struct rsxx_cardinfo *card)
{
struct rsxx_dma *dma;
struct rsxx_dma *tmp;
int i;
for (i = 0; i < card->n_targets; i++) {
spin_lock(&card->ctrl[i].queue_lock);
list_for_each_entry_safe(dma, tmp, &card->ctrl[i].queue, list) {
list_del(&dma->list);
rsxx_complete_dma(&card->ctrl[i], dma, DMA_CANCELLED);
}
spin_unlock(&card->ctrl[i].queue_lock);
}
}
int rsxx_eeh_remap_dmas(struct rsxx_cardinfo *card)
{
struct rsxx_dma *dma;
int i;
for (i = 0; i < card->n_targets; i++) {
spin_lock(&card->ctrl[i].queue_lock);
spin_lock_bh(&card->ctrl[i].queue_lock);
list_for_each_entry(dma, &card->ctrl[i].queue, list) {
dma->dma_addr = pci_map_page(card->dev, dma->page,
dma->pg_off, get_dma_size(dma),
@ -1067,12 +1074,12 @@ int rsxx_eeh_remap_dmas(struct rsxx_cardinfo *card)
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
if (!dma->dma_addr) {
spin_unlock(&card->ctrl[i].queue_lock);
spin_unlock_bh(&card->ctrl[i].queue_lock);
kmem_cache_free(rsxx_dma_pool, dma);
return -ENOMEM;
}
}
spin_unlock(&card->ctrl[i].queue_lock);
spin_unlock_bh(&card->ctrl[i].queue_lock);
}
return 0;

10
drivers/block/rsxx/rsxx_priv.h
View File

@ -39,6 +39,7 @@
#include <linux/vmalloc.h>
#include <linux/timer.h>
#include <linux/ioctl.h>
#include <linux/delay.h>
#include "rsxx.h"
#include "rsxx_cfg.h"
@ -114,6 +115,7 @@ struct rsxx_dma_ctrl {
struct timer_list activity_timer;
struct dma_tracker_list *trackers;
struct rsxx_dma_stats stats;
struct mutex work_lock;
};
struct rsxx_cardinfo {
@ -134,6 +136,7 @@ struct rsxx_cardinfo {
spinlock_t lock;
bool active;
struct creg_cmd *active_cmd;
struct workqueue_struct *creg_wq;
struct work_struct done_work;
struct list_head queue;
unsigned int q_depth;
@ -154,6 +157,7 @@ struct rsxx_cardinfo {
int buf_len;
} log;
struct workqueue_struct *event_wq;
struct work_struct event_work;
unsigned int state;
u64 size8;
@ -181,6 +185,8 @@ struct rsxx_cardinfo {
int n_targets;
struct rsxx_dma_ctrl *ctrl;
struct dentry *debugfs_dir;
};
enum rsxx_pci_regmap {
@ -283,6 +289,7 @@ enum rsxx_creg_addr {
CREG_ADD_CAPABILITIES = 0x80001050,
CREG_ADD_LOG = 0x80002000,
CREG_ADD_NUM_TARGETS = 0x80003000,
CREG_ADD_CRAM = 0xA0000000,
CREG_ADD_CONFIG = 0xB0000000,
};
@ -372,6 +379,8 @@ typedef void (*rsxx_dma_cb)(struct rsxx_cardinfo *card,
int rsxx_dma_setup(struct rsxx_cardinfo *card);
void rsxx_dma_destroy(struct rsxx_cardinfo *card);
int rsxx_dma_init(void);
int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl, struct list_head *q);
int rsxx_dma_cancel(struct rsxx_dma_ctrl *ctrl);
void rsxx_dma_cleanup(void);
void rsxx_dma_queue_reset(struct rsxx_cardinfo *card);
int rsxx_dma_configure(struct rsxx_cardinfo *card);
@ -382,7 +391,6 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
void *cb_data);
int rsxx_hw_buffers_init(struct pci_dev *dev, struct rsxx_dma_ctrl *ctrl);
int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card);
void rsxx_eeh_cancel_dmas(struct rsxx_cardinfo *card);
int rsxx_eeh_remap_dmas(struct rsxx_cardinfo *card);
/***** cregs.c *****/

882
drivers/block/xen-blkback/blkback.c
View File

File diff suppressed because it is too large Load Diff

147
drivers/block/xen-blkback/common.h
View File

@ -50,6 +50,19 @@
__func__, __LINE__, ##args)
/*
* This is the maximum number of segments that would be allowed in indirect
* requests. This value will also be passed to the frontend.
*/
#define MAX_INDIRECT_SEGMENTS 256
#define SEGS_PER_INDIRECT_FRAME \
(PAGE_SIZE/sizeof(struct blkif_request_segment_aligned))
#define MAX_INDIRECT_PAGES \
((MAX_INDIRECT_SEGMENTS + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
#define INDIRECT_PAGES(_segs) \
((_segs + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
/* Not a real protocol. Used to generate ring structs which contain
* the elements common to all protocols only. This way we get a
* compiler-checkable way to use common struct elements, so we can
@ -83,12 +96,31 @@ struct blkif_x86_32_request_other {
uint64_t id; /* private guest value, echoed in resp */
} __attribute__((__packed__));
struct blkif_x86_32_request_indirect {
uint8_t indirect_op;
uint16_t nr_segments;
uint64_t id;
blkif_sector_t sector_number;
blkif_vdev_t handle;
uint16_t _pad1;
grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST];
/*
* The maximum number of indirect segments (and pages) that will
* be used is determined by MAX_INDIRECT_SEGMENTS, this value
* is also exported to the guest (via xenstore
* feature-max-indirect-segments entry), so the frontend knows how
* many indirect segments the backend supports.
*/
uint64_t _pad2; /* make it 64 byte aligned */
} __attribute__((__packed__));
struct blkif_x86_32_request {
uint8_t operation; /* BLKIF_OP_??? */
union {
struct blkif_x86_32_request_rw rw;
struct blkif_x86_32_request_discard discard;
struct blkif_x86_32_request_other other;
struct blkif_x86_32_request_indirect indirect;
} u;
} __attribute__((__packed__));
@ -127,12 +159,32 @@ struct blkif_x86_64_request_other {
uint64_t id; /* private guest value, echoed in resp */
} __attribute__((__packed__));
struct blkif_x86_64_request_indirect {
uint8_t indirect_op;
uint16_t nr_segments;
uint32_t _pad1; /* offsetof(blkif_..,u.indirect.id)==8 */
uint64_t id;
blkif_sector_t sector_number;
blkif_vdev_t handle;
uint16_t _pad2;
grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST];
/*
* The maximum number of indirect segments (and pages) that will
* be used is determined by MAX_INDIRECT_SEGMENTS, this value
* is also exported to the guest (via xenstore
* feature-max-indirect-segments entry), so the frontend knows how
* many indirect segments the backend supports.
*/
uint32_t _pad3; /* make it 64 byte aligned */
} __attribute__((__packed__));
struct blkif_x86_64_request {
uint8_t operation; /* BLKIF_OP_??? */
union {
struct blkif_x86_64_request_rw rw;
struct blkif_x86_64_request_discard discard;
struct blkif_x86_64_request_other other;
struct blkif_x86_64_request_indirect indirect;
} u;
} __attribute__((__packed__));
@ -182,12 +234,26 @@ struct xen_vbd {
struct backend_info;
/* Number of available flags */
#define PERSISTENT_GNT_FLAGS_SIZE 2
/* This persistent grant is currently in use */
#define PERSISTENT_GNT_ACTIVE 0
/*
* This persistent grant has been used, this flag is set when we remove the
* PERSISTENT_GNT_ACTIVE, to know that this grant has been used recently.
*/
#define PERSISTENT_GNT_WAS_ACTIVE 1
/* Number of requests that we can fit in a ring */
#define XEN_BLKIF_REQS 32
struct persistent_gnt {
struct page *page;
grant_ref_t gnt;
grant_handle_t handle;
DECLARE_BITMAP(flags, PERSISTENT_GNT_FLAGS_SIZE);
struct rb_node node;
struct list_head remove_node;
};
struct xen_blkif {
@ -219,6 +285,23 @@ struct xen_blkif {
/* tree to store persistent grants */
struct rb_root persistent_gnts;
unsigned int persistent_gnt_c;
atomic_t persistent_gnt_in_use;
unsigned long next_lru;
/* used by the kworker that offload work from the persistent purge */
struct list_head persistent_purge_list;
struct work_struct persistent_purge_work;
/* buffer of free pages to map grant refs */
spinlock_t free_pages_lock;
int free_pages_num;
struct list_head free_pages;
/* List of all 'pending_req' available */
struct list_head pending_free;
/* And its spinlock. */
spinlock_t pending_free_lock;
wait_queue_head_t pending_free_wq;
/* statistics */
unsigned long st_print;
@ -231,6 +314,41 @@ struct xen_blkif {
unsigned long long st_wr_sect;
wait_queue_head_t waiting_to_free;
/* Thread shutdown wait queue. */
wait_queue_head_t shutdown_wq;
};
struct seg_buf {
unsigned long offset;
unsigned int nsec;
};
struct grant_page {
struct page *page;
struct persistent_gnt *persistent_gnt;
grant_handle_t handle;
grant_ref_t gref;
};
/*
* Each outstanding request that we've passed to the lower device layers has a
* 'pending_req' allocated to it. Each buffer_head that completes decrements
* the pendcnt towards zero. When it hits zero, the specified domain has a
* response queued for it, with the saved 'id' passed back.
*/
struct pending_req {
struct xen_blkif *blkif;
u64 id;
int nr_pages;
atomic_t pendcnt;
unsigned short operation;
int status;
struct list_head free_list;
struct grant_page *segments[MAX_INDIRECT_SEGMENTS];
/* Indirect descriptors */
struct grant_page *indirect_pages[MAX_INDIRECT_PAGES];
struct seg_buf seg[MAX_INDIRECT_SEGMENTS];
struct bio *biolist[MAX_INDIRECT_SEGMENTS];
};
@ -257,6 +375,7 @@ int xen_blkif_xenbus_init(void);
irqreturn_t xen_blkif_be_int(int irq, void *dev_id);
int xen_blkif_schedule(void *arg);
int xen_blkif_purge_persistent(void *arg);
int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
struct backend_info *be, int state);
@ -268,7 +387,7 @@ struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be);
static inline void blkif_get_x86_32_req(struct blkif_request *dst,
struct blkif_x86_32_request *src)
{
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j;
dst->operation = src->operation;
switch (src->operation) {
case BLKIF_OP_READ:
@ -291,6 +410,18 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst,
dst->u.discard.sector_number = src->u.discard.sector_number;
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
break;
case BLKIF_OP_INDIRECT:
dst->u.indirect.indirect_op = src->u.indirect.indirect_op;
dst->u.indirect.nr_segments = src->u.indirect.nr_segments;
dst->u.indirect.handle = src->u.indirect.handle;
dst->u.indirect.id = src->u.indirect.id;
dst->u.indirect.sector_number = src->u.indirect.sector_number;
barrier();
j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments));
for (i = 0; i < j; i++)
dst->u.indirect.indirect_grefs[i] =
src->u.indirect.indirect_grefs[i];
break;
default:
/*
* Don't know how to translate this op. Only get the
@ -304,7 +435,7 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst,
static inline void blkif_get_x86_64_req(struct blkif_request *dst,
struct blkif_x86_64_request *src)
{
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j;
dst->operation = src->operation;
switch (src->operation) {
case BLKIF_OP_READ:
@ -327,6 +458,18 @@ static inline void blkif_get_x86_64_req(struct blkif_request *dst,
dst->u.discard.sector_number = src->u.discard.sector_number;
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
break;
case BLKIF_OP_INDIRECT:
dst->u.indirect.indirect_op = src->u.indirect.indirect_op;
dst->u.indirect.nr_segments = src->u.indirect.nr_segments;
dst->u.indirect.handle = src->u.indirect.handle;
dst->u.indirect.id = src->u.indirect.id;
dst->u.indirect.sector_number = src->u.indirect.sector_number;
barrier();
j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments));
for (i = 0; i < j; i++)
dst->u.indirect.indirect_grefs[i] =
src->u.indirect.indirect_grefs[i];
break;
default:
/*
* Don't know how to translate this op. Only get the

85
drivers/block/xen-blkback/xenbus.c
View File

@ -98,12 +98,17 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
err = PTR_ERR(blkif->xenblkd);
blkif->xenblkd = NULL;
xenbus_dev_error(blkif->be->dev, err, "start xenblkd");
return;
}
}
static struct xen_blkif *xen_blkif_alloc(domid_t domid)
{
struct xen_blkif *blkif;
struct pending_req *req, *n;
int i, j;
BUILD_BUG_ON(MAX_INDIRECT_PAGES > BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST);
blkif = kmem_cache_zalloc(xen_blkif_cachep, GFP_KERNEL);
if (!blkif)
@ -118,8 +123,57 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
blkif->st_print = jiffies;
init_waitqueue_head(&blkif->waiting_to_free);
blkif->persistent_gnts.rb_node = NULL;
spin_lock_init(&blkif->free_pages_lock);
INIT_LIST_HEAD(&blkif->free_pages);
blkif->free_pages_num = 0;
atomic_set(&blkif->persistent_gnt_in_use, 0);
INIT_LIST_HEAD(&blkif->pending_free);
for (i = 0; i < XEN_BLKIF_REQS; i++) {
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
goto fail;
list_add_tail(&req->free_list,
&blkif->pending_free);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
req->segments[j] = kzalloc(sizeof(*req->segments[0]),
GFP_KERNEL);
if (!req->segments[j])
goto fail;
}
for (j = 0; j < MAX_INDIRECT_PAGES; j++) {
req->indirect_pages[j] = kzalloc(sizeof(*req->indirect_pages[0]),
GFP_KERNEL);
if (!req->indirect_pages[j])
goto fail;
}
}
spin_lock_init(&blkif->pending_free_lock);
init_waitqueue_head(&blkif->pending_free_wq);
init_waitqueue_head(&blkif->shutdown_wq);
return blkif;
fail:
list_for_each_entry_safe(req, n, &blkif->pending_free, free_list) {
list_del(&req->free_list);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
if (!req->segments[j])
break;
kfree(req->segments[j]);
}
for (j = 0; j < MAX_INDIRECT_PAGES; j++) {
if (!req->indirect_pages[j])
break;
kfree(req->indirect_pages[j]);
}
kfree(req);
}
kmem_cache_free(xen_blkif_cachep, blkif);
return ERR_PTR(-ENOMEM);
}
static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page,
@ -178,6 +232,7 @@ static void xen_blkif_disconnect(struct xen_blkif *blkif)
{
if (blkif->xenblkd) {
kthread_stop(blkif->xenblkd);
wake_up(&blkif->shutdown_wq);
blkif->xenblkd = NULL;
}
@ -198,8 +253,28 @@ static void xen_blkif_disconnect(struct xen_blkif *blkif)
static void xen_blkif_free(struct xen_blkif *blkif)
{
struct pending_req *req, *n;
int i = 0, j;
if (!atomic_dec_and_test(&blkif->refcnt))
BUG();
/* Check that there is no request in use */
list_for_each_entry_safe(req, n, &blkif->pending_free, free_list) {
list_del(&req->free_list);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++)
kfree(req->segments[j]);
for (j = 0; j < MAX_INDIRECT_PAGES; j++)
kfree(req->indirect_pages[j]);
kfree(req);
i++;
}
WARN_ON(i != XEN_BLKIF_REQS);
kmem_cache_free(xen_blkif_cachep, blkif);
}
@ -678,6 +753,11 @@ again:
dev->nodename);
goto abort;
}
err = xenbus_printf(xbt, dev->nodename, "feature-max-indirect-segments", "%u",
MAX_INDIRECT_SEGMENTS);
if (err)
dev_warn(&dev->dev, "writing %s/feature-max-indirect-segments (%d)",
dev->nodename, err);
err = xenbus_printf(xbt, dev->nodename, "sectors", "%llu",
(unsigned long long)vbd_sz(&be->blkif->vbd));
@ -704,6 +784,11 @@ again:
dev->nodename);
goto abort;
}
err = xenbus_printf(xbt, dev->nodename, "physical-sector-size", "%u",
bdev_physical_block_size(be->blkif->vbd.bdev));
if (err)
xenbus_dev_error(dev, err, "writing %s/physical-sector-size",
dev->nodename);
err = xenbus_transaction_end(xbt, 0);
if (err == -EAGAIN)

532
drivers/block/xen-blkfront.c
View File

@ -74,12 +74,30 @@ struct grant {
struct blk_shadow {
struct blkif_request req;
struct request *request;
struct grant *grants_used[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct grant **grants_used;
struct grant **indirect_grants;
struct scatterlist *sg;
};
struct split_bio {
struct bio *bio;
atomic_t pending;
int err;
};
static DEFINE_MUTEX(blkfront_mutex);
static const struct block_device_operations xlvbd_block_fops;
/*
* Maximum number of segments in indirect requests, the actual value used by
* the frontend driver is the minimum of this value and the value provided
* by the backend driver.
*/
static unsigned int xen_blkif_max_segments = 32;
module_param_named(max, xen_blkif_max_segments, int, S_IRUGO);
MODULE_PARM_DESC(max, "Maximum amount of segments in indirect requests (default is 32)");
#define BLK_RING_SIZE __CONST_RING_SIZE(blkif, PAGE_SIZE)
/*
@ -98,7 +116,6 @@ struct blkfront_info
enum blkif_state connected;
int ring_ref;
struct blkif_front_ring ring;
struct scatterlist sg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
unsigned int evtchn, irq;
struct request_queue *rq;
struct work_struct work;
@ -114,6 +131,7 @@ struct blkfront_info
unsigned int discard_granularity;
unsigned int discard_alignment;
unsigned int feature_persistent:1;
unsigned int max_indirect_segments;
int is_ready;
};
@ -142,6 +160,13 @@ static DEFINE_SPINLOCK(minor_lock);
#define DEV_NAME "xvd" /* name in /dev */
#define SEGS_PER_INDIRECT_FRAME \
(PAGE_SIZE/sizeof(struct blkif_request_segment_aligned))
#define INDIRECT_GREFS(_segs) \
((_segs + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
static int blkfront_setup_indirect(struct blkfront_info *info);
static int get_id_from_freelist(struct blkfront_info *info)
{
unsigned long free = info->shadow_free;
@ -358,7 +383,8 @@ static int blkif_queue_request(struct request *req)
struct blkif_request *ring_req;
unsigned long id;
unsigned int fsect, lsect;
int i, ref;
int i, ref, n;
struct blkif_request_segment_aligned *segments = NULL;
/*
* Used to store if we are able to queue the request by just using
@ -369,21 +395,27 @@ static int blkif_queue_request(struct request *req)
grant_ref_t gref_head;
struct grant *gnt_list_entry = NULL;
struct scatterlist *sg;
int nseg, max_grefs;
if (unlikely(info->connected != BLKIF_STATE_CONNECTED))
return 1;
/* Check if we have enought grants to allocate a requests */
if (info->persistent_gnts_c < BLKIF_MAX_SEGMENTS_PER_REQUEST) {
max_grefs = info->max_indirect_segments ?
info->max_indirect_segments +
INDIRECT_GREFS(info->max_indirect_segments) :
BLKIF_MAX_SEGMENTS_PER_REQUEST;
/* Check if we have enough grants to allocate a requests */
if (info->persistent_gnts_c < max_grefs) {
new_persistent_gnts = 1;
if (gnttab_alloc_grant_references(
BLKIF_MAX_SEGMENTS_PER_REQUEST - info->persistent_gnts_c,
max_grefs - info->persistent_gnts_c,
&gref_head) < 0) {
gnttab_request_free_callback(
&info->callback,
blkif_restart_queue_callback,
info,
BLKIF_MAX_SEGMENTS_PER_REQUEST);
max_grefs);
return 1;
}
} else
@ -394,42 +426,67 @@ static int blkif_queue_request(struct request *req)
id = get_id_from_freelist(info);
info->shadow[id].request = req;
ring_req->u.rw.id = id;
ring_req->u.rw.sector_number = (blkif_sector_t)blk_rq_pos(req);
ring_req->u.rw.handle = info->handle;
ring_req->operation = rq_data_dir(req) ?
BLKIF_OP_WRITE : BLKIF_OP_READ;
if (req->cmd_flags & (REQ_FLUSH | REQ_FUA)) {
/*
* Ideally we can do an unordered flush-to-disk. In case the
* backend onlysupports barriers, use that. A barrier request
* a superset of FUA, so we can implement it the same
* way. (It's also a FLUSH+FUA, since it is
* guaranteed ordered WRT previous writes.)
*/
ring_req->operation = info->flush_op;
}
if (unlikely(req->cmd_flags & (REQ_DISCARD | REQ_SECURE))) {
/* id, sector_number and handle are set above. */
ring_req->operation = BLKIF_OP_DISCARD;
ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
ring_req->u.discard.id = id;
ring_req->u.discard.sector_number = (blkif_sector_t)blk_rq_pos(req);
if ((req->cmd_flags & REQ_SECURE) && info->feature_secdiscard)
ring_req->u.discard.flag = BLKIF_DISCARD_SECURE;
else
ring_req->u.discard.flag = 0;
} else {
ring_req->u.rw.nr_segments = blk_rq_map_sg(req->q, req,
info->sg);
BUG_ON(ring_req->u.rw.nr_segments >
BLKIF_MAX_SEGMENTS_PER_REQUEST);
for_each_sg(info->sg, sg, ring_req->u.rw.nr_segments, i) {
BUG_ON(info->max_indirect_segments == 0 &&
req->nr_phys_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST);
BUG_ON(info->max_indirect_segments &&
req->nr_phys_segments > info->max_indirect_segments);
nseg = blk_rq_map_sg(req->q, req, info->shadow[id].sg);
ring_req->u.rw.id = id;
if (nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST) {
/*
* The indirect operation can only be a BLKIF_OP_READ or
* BLKIF_OP_WRITE
*/
BUG_ON(req->cmd_flags & (REQ_FLUSH | REQ_FUA));
ring_req->operation = BLKIF_OP_INDIRECT;
ring_req->u.indirect.indirect_op = rq_data_dir(req) ?
BLKIF_OP_WRITE : BLKIF_OP_READ;
ring_req->u.indirect.sector_number = (blkif_sector_t)blk_rq_pos(req);
ring_req->u.indirect.handle = info->handle;
ring_req->u.indirect.nr_segments = nseg;
} else {
ring_req->u.rw.sector_number = (blkif_sector_t)blk_rq_pos(req);
ring_req->u.rw.handle = info->handle;
ring_req->operation = rq_data_dir(req) ?
BLKIF_OP_WRITE : BLKIF_OP_READ;
if (req->cmd_flags & (REQ_FLUSH | REQ_FUA)) {
/*
* Ideally we can do an unordered flush-to-disk. In case the
* backend onlysupports barriers, use that. A barrier request
* a superset of FUA, so we can implement it the same
* way. (It's also a FLUSH+FUA, since it is
* guaranteed ordered WRT previous writes.)
*/
ring_req->operation = info->flush_op;
}
ring_req->u.rw.nr_segments = nseg;
}
for_each_sg(info->shadow[id].sg, sg, nseg, i) {
fsect = sg->offset >> 9;
lsect = fsect + (sg->length >> 9) - 1;
if ((ring_req->operation == BLKIF_OP_INDIRECT) &&
(i % SEGS_PER_INDIRECT_FRAME == 0)) {
if (segments)
kunmap_atomic(segments);
n = i / SEGS_PER_INDIRECT_FRAME;
gnt_list_entry = get_grant(&gref_head, info);
info->shadow[id].indirect_grants[n] = gnt_list_entry;
segments = kmap_atomic(pfn_to_page(gnt_list_entry->pfn));
ring_req->u.indirect.indirect_grefs[n] = gnt_list_entry->gref;
}
gnt_list_entry = get_grant(&gref_head, info);
ref = gnt_list_entry->gref;
@ -441,8 +498,7 @@ static int blkif_queue_request(struct request *req)
BUG_ON(sg->offset + sg->length > PAGE_SIZE);
shared_data = kmap_atomic(
pfn_to_page(gnt_list_entry->pfn));
shared_data = kmap_atomic(pfn_to_page(gnt_list_entry->pfn));
bvec_data = kmap_atomic(sg_page(sg));
/*
@ -461,13 +517,23 @@ static int blkif_queue_request(struct request *req)
kunmap_atomic(bvec_data);
kunmap_atomic(shared_data);
}
ring_req->u.rw.seg[i] =
(struct blkif_request_segment) {
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
if (ring_req->operation != BLKIF_OP_INDIRECT) {
ring_req->u.rw.seg[i] =
(struct blkif_request_segment) {
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
} else {
n = i % SEGS_PER_INDIRECT_FRAME;
segments[n] =
(struct blkif_request_segment_aligned) {
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
}
}
if (segments)
kunmap_atomic(segments);
}
info->ring.req_prod_pvt++;
@ -542,7 +608,9 @@ wait:
flush_requests(info);
}
static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
unsigned int physical_sector_size,
unsigned int segments)
{
struct request_queue *rq;
struct blkfront_info *info = gd->private_data;
@ -564,14 +632,15 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
/* Hard sector size and max sectors impersonate the equiv. hardware. */
blk_queue_logical_block_size(rq, sector_size);
blk_queue_max_hw_sectors(rq, 512);
blk_queue_physical_block_size(rq, physical_sector_size);
blk_queue_max_hw_sectors(rq, (segments * PAGE_SIZE) / 512);
/* Each segment in a request is up to an aligned page in size. */
blk_queue_segment_boundary(rq, PAGE_SIZE - 1);
blk_queue_max_segment_size(rq, PAGE_SIZE);
/* Ensure a merged request will fit in a single I/O ring slot. */
blk_queue_max_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST);
blk_queue_max_segments(rq, segments);
/* Make sure buffer addresses are sector-aligned. */
blk_queue_dma_alignment(rq, 511);
@ -588,13 +657,16 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
static void xlvbd_flush(struct blkfront_info *info)
{
blk_queue_flush(info->rq, info->feature_flush);
printk(KERN_INFO "blkfront: %s: %s: %s %s\n",
printk(KERN_INFO "blkfront: %s: %s: %s %s %s %s %s\n",
info->gd->disk_name,
info->flush_op == BLKIF_OP_WRITE_BARRIER ?
"barrier" : (info->flush_op == BLKIF_OP_FLUSH_DISKCACHE ?
"flush diskcache" : "barrier or flush"),
info->feature_flush ? "enabled" : "disabled",
info->feature_persistent ? "using persistent grants" : "");
info->feature_flush ? "enabled;" : "disabled;",
"persistent grants:",
info->feature_persistent ? "enabled;" : "disabled;",
"indirect descriptors:",
info->max_indirect_segments ? "enabled;" : "disabled;");
}
static int xen_translate_vdev(int vdevice, int *minor, unsigned int *offset)
@ -667,7 +739,8 @@ static char *encode_disk_name(char *ptr, unsigned int n)
static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
struct blkfront_info *info,
u16 vdisk_info, u16 sector_size)
u16 vdisk_info, u16 sector_size,
unsigned int physical_sector_size)
{
struct gendisk *gd;
int nr_minors = 1;
@ -734,7 +807,9 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
gd->driverfs_dev = &(info->xbdev->dev);
set_capacity(gd, capacity);
if (xlvbd_init_blk_queue(gd, sector_size)) {
if (xlvbd_init_blk_queue(gd, sector_size, physical_sector_size,
info->max_indirect_segments ? :
BLKIF_MAX_SEGMENTS_PER_REQUEST)) {
del_gendisk(gd);
goto release;
}
@ -818,6 +893,7 @@ static void blkif_free(struct blkfront_info *info, int suspend)
{
struct grant *persistent_gnt;
struct grant *n;
int i, j, segs;
/* Prevent new requests being issued until we fix things up. */
spin_lock_irq(&info->io_lock);
@ -843,6 +919,47 @@ static void blkif_free(struct blkfront_info *info, int suspend)
}
BUG_ON(info->persistent_gnts_c != 0);
for (i = 0; i < BLK_RING_SIZE; i++) {
/*
* Clear persistent grants present in requests already
* on the shared ring
*/
if (!info->shadow[i].request)
goto free_shadow;
segs = info->shadow[i].req.operation == BLKIF_OP_INDIRECT ?
info->shadow[i].req.u.indirect.nr_segments :
info->shadow[i].req.u.rw.nr_segments;
for (j = 0; j < segs; j++) {
persistent_gnt = info->shadow[i].grants_used[j];
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
__free_page(pfn_to_page(persistent_gnt->pfn));
kfree(persistent_gnt);
}
if (info->shadow[i].req.operation != BLKIF_OP_INDIRECT)
/*
* If this is not an indirect operation don't try to
* free indirect segments
*/
goto free_shadow;
for (j = 0; j < INDIRECT_GREFS(segs); j++) {
persistent_gnt = info->shadow[i].indirect_grants[j];
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
__free_page(pfn_to_page(persistent_gnt->pfn));
kfree(persistent_gnt);
}
free_shadow:
kfree(info->shadow[i].grants_used);
info->shadow[i].grants_used = NULL;
kfree(info->shadow[i].indirect_grants);
info->shadow[i].indirect_grants = NULL;
kfree(info->shadow[i].sg);
info->shadow[i].sg = NULL;
}
/* No more gnttab callback work. */
gnttab_cancel_free_callback(&info->callback);
spin_unlock_irq(&info->io_lock);
@ -867,12 +984,13 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info,
struct blkif_response *bret)
{
int i = 0;
struct bio_vec *bvec;
struct req_iterator iter;
unsigned long flags;
struct scatterlist *sg;
char *bvec_data;
void *shared_data;
unsigned int offset = 0;
int nseg;
nseg = s->req.operation == BLKIF_OP_INDIRECT ?
s->req.u.indirect.nr_segments : s->req.u.rw.nr_segments;
if (bret->operation == BLKIF_OP_READ) {
/*
@ -881,26 +999,29 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info,
* than PAGE_SIZE, we have to keep track of the current offset,
* to be sure we are copying the data from the right shared page.
*/
rq_for_each_segment(bvec, s->request, iter) {
BUG_ON((bvec->bv_offset + bvec->bv_len) > PAGE_SIZE);
if (bvec->bv_offset < offset)
i++;
BUG_ON(i >= s->req.u.rw.nr_segments);
for_each_sg(s->sg, sg, nseg, i) {
BUG_ON(sg->offset + sg->length > PAGE_SIZE);
shared_data = kmap_atomic(
pfn_to_page(s->grants_used[i]->pfn));
bvec_data = bvec_kmap_irq(bvec, &flags);
memcpy(bvec_data, shared_data + bvec->bv_offset,
bvec->bv_len);
bvec_kunmap_irq(bvec_data, &flags);
bvec_data = kmap_atomic(sg_page(sg));
memcpy(bvec_data + sg->offset,
shared_data + sg->offset,
sg->length);
kunmap_atomic(bvec_data);
kunmap_atomic(shared_data);
offset = bvec->bv_offset + bvec->bv_len;
}
}
/* Add the persistent grant into the list of free grants */
for (i = 0; i < s->req.u.rw.nr_segments; i++) {
for (i = 0; i < nseg; i++) {
list_add(&s->grants_used[i]->node, &info->persistent_gnts);
info->persistent_gnts_c++;
}
if (s->req.operation == BLKIF_OP_INDIRECT) {
for (i = 0; i < INDIRECT_GREFS(nseg); i++) {
list_add(&s->indirect_grants[i]->node, &info->persistent_gnts);
info->persistent_gnts_c++;
}
}
}
static irqreturn_t blkif_interrupt(int irq, void *dev_id)
@ -1034,14 +1155,6 @@ static int setup_blkring(struct xenbus_device *dev,
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
sg_init_table(info->sg, BLKIF_MAX_SEGMENTS_PER_REQUEST);
/* Allocate memory for grants */
err = fill_grant_buffer(info, BLK_RING_SIZE *
BLKIF_MAX_SEGMENTS_PER_REQUEST);
if (err)
goto fail;
err = xenbus_grant_ring(dev, virt_to_mfn(info->ring.sring));
if (err < 0) {
free_page((unsigned long)sring);
@ -1223,13 +1336,84 @@ static int blkfront_probe(struct xenbus_device *dev,
return 0;
}
/*
* This is a clone of md_trim_bio, used to split a bio into smaller ones
*/
static void trim_bio(struct bio *bio, int offset, int size)
{
/* 'bio' is a cloned bio which we need to trim to match
* the given offset and size.
* This requires adjusting bi_sector, bi_size, and bi_io_vec
*/
int i;
struct bio_vec *bvec;
int sofar = 0;
size <<= 9;
if (offset == 0 && size == bio->bi_size)
return;
bio->bi_sector += offset;
bio->bi_size = size;
offset <<= 9;
clear_bit(BIO_SEG_VALID, &bio->bi_flags);
while (bio->bi_idx < bio->bi_vcnt &&
bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
/* remove this whole bio_vec */
offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
bio->bi_idx++;
}
if (bio->bi_idx < bio->bi_vcnt) {
bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
}
/* avoid any complications with bi_idx being non-zero*/
if (bio->bi_idx) {
memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
(bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
bio->bi_vcnt -= bio->bi_idx;
bio->bi_idx = 0;
}
/* Make sure vcnt and last bv are not too big */
bio_for_each_segment(bvec, bio, i) {
if (sofar + bvec->bv_len > size)
bvec->bv_len = size - sofar;
if (bvec->bv_len == 0) {
bio->bi_vcnt = i;
break;
}
sofar += bvec->bv_len;
}
}
static void split_bio_end(struct bio *bio, int error)
{
struct split_bio *split_bio = bio->bi_private;
if (error)
split_bio->err = error;
if (atomic_dec_and_test(&split_bio->pending)) {
split_bio->bio->bi_phys_segments = 0;
bio_endio(split_bio->bio, split_bio->err);
kfree(split_bio);
}
bio_put(bio);
}
static int blkif_recover(struct blkfront_info *info)
{
int i;
struct blkif_request *req;
struct request *req, *n;
struct blk_shadow *copy;
int j;
int rc;
struct bio *bio, *cloned_bio;
struct bio_list bio_list, merge_bio;
unsigned int segs, offset;
int pending, size;
struct split_bio *split_bio;
struct list_head requests;
/* Stage 1: Make a safe copy of the shadow state. */
copy = kmemdup(info->shadow, sizeof(info->shadow),
@ -1244,36 +1428,64 @@ static int blkif_recover(struct blkfront_info *info)
info->shadow_free = info->ring.req_prod_pvt;
info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
/* Stage 3: Find pending requests and requeue them. */
rc = blkfront_setup_indirect(info);
if (rc) {
kfree(copy);
return rc;
}
segs = info->max_indirect_segments ? : BLKIF_MAX_SEGMENTS_PER_REQUEST;
blk_queue_max_segments(info->rq, segs);
bio_list_init(&bio_list);
INIT_LIST_HEAD(&requests);
for (i = 0; i < BLK_RING_SIZE; i++) {
/* Not in use? */
if (!copy[i].request)
continue;
/* Grab a request slot and copy shadow state into it. */
req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
*req = copy[i].req;
/* We get a new request id, and must reset the shadow state. */
req->u.rw.id = get_id_from_freelist(info);
memcpy(&info->shadow[req->u.rw.id], &copy[i], sizeof(copy[i]));
if (req->operation != BLKIF_OP_DISCARD) {
/* Rewrite any grant references invalidated by susp/resume. */
for (j = 0; j < req->u.rw.nr_segments; j++)
gnttab_grant_foreign_access_ref(
req->u.rw.seg[j].gref,
info->xbdev->otherend_id,
pfn_to_mfn(copy[i].grants_used[j]->pfn),
0);
/*
* Get the bios in the request so we can re-queue them.
*/
if (copy[i].request->cmd_flags &
(REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
/*
* Flush operations don't contain bios, so
* we need to requeue the whole request
*/
list_add(&copy[i].request->queuelist, &requests);
continue;
}
info->shadow[req->u.rw.id].req = *req;
info->ring.req_prod_pvt++;
merge_bio.head = copy[i].request->bio;
merge_bio.tail = copy[i].request->biotail;
bio_list_merge(&bio_list, &merge_bio);
copy[i].request->bio = NULL;
blk_put_request(copy[i].request);
}
kfree(copy);
/*
* Empty the queue, this is important because we might have
* requests in the queue with more segments than what we
* can handle now.
*/
spin_lock_irq(&info->io_lock);
while ((req = blk_fetch_request(info->rq)) != NULL) {
if (req->cmd_flags &
(REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
list_add(&req->queuelist, &requests);
continue;
}
merge_bio.head = req->bio;
merge_bio.tail = req->biotail;
bio_list_merge(&bio_list, &merge_bio);
req->bio = NULL;
if (req->cmd_flags & (REQ_FLUSH | REQ_FUA))
pr_alert("diskcache flush request found!\n");
__blk_put_request(info->rq, req);
}
spin_unlock_irq(&info->io_lock);
xenbus_switch_state(info->xbdev, XenbusStateConnected);
spin_lock_irq(&info->io_lock);
@ -1281,14 +1493,50 @@ static int blkif_recover(struct blkfront_info *info)
/* Now safe for us to use the shared ring */
info->connected = BLKIF_STATE_CONNECTED;
/* Send off requeued requests */
flush_requests(info);
/* Kick any other new requests queued since we resumed */
kick_pending_request_queues(info);
list_for_each_entry_safe(req, n, &requests, queuelist) {
/* Requeue pending requests (flush or discard) */
list_del_init(&req->queuelist);
BUG_ON(req->nr_phys_segments > segs);
blk_requeue_request(info->rq, req);
}
spin_unlock_irq(&info->io_lock);
while ((bio = bio_list_pop(&bio_list)) != NULL) {
/* Traverse the list of pending bios and re-queue them */
if (bio_segments(bio) > segs) {
/*
* This bio has more segments than what we can
* handle, we have to split it.
*/
pending = (bio_segments(bio) + segs - 1) / segs;
split_bio = kzalloc(sizeof(*split_bio), GFP_NOIO);
BUG_ON(split_bio == NULL);
atomic_set(&split_bio->pending, pending);
split_bio->bio = bio;
for (i = 0; i < pending; i++) {
offset = (i * segs * PAGE_SIZE) >> 9;
size = min((unsigned int)(segs * PAGE_SIZE) >> 9,
(unsigned int)(bio->bi_size >> 9) - offset);
cloned_bio = bio_clone(bio, GFP_NOIO);
BUG_ON(cloned_bio == NULL);
trim_bio(cloned_bio, offset, size);
cloned_bio->bi_private = split_bio;
cloned_bio->bi_end_io = split_bio_end;
submit_bio(cloned_bio->bi_rw, cloned_bio);
}
/*
* Now we have to wait for all those smaller bios to
* end, so we can also end the "parent" bio.
*/
continue;
}
/* We don't need to split this bio */
submit_bio(bio->bi_rw, bio);
}
return 0;
}
@ -1308,8 +1556,12 @@ static int blkfront_resume(struct xenbus_device *dev)
blkif_free(info, info->connected == BLKIF_STATE_CONNECTED);
err = talk_to_blkback(dev, info);
if (info->connected == BLKIF_STATE_SUSPENDED && !err)
err = blkif_recover(info);
/*
* We have to wait for the backend to switch to
* connected state, since we want to read which
* features it supports.
*/
return err;
}
@ -1387,6 +1639,60 @@ static void blkfront_setup_discard(struct blkfront_info *info)
kfree(type);
}
static int blkfront_setup_indirect(struct blkfront_info *info)
{
unsigned int indirect_segments, segs;
int err, i;
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-max-indirect-segments", "%u", &indirect_segments,
NULL);
if (err) {
info->max_indirect_segments = 0;
segs = BLKIF_MAX_SEGMENTS_PER_REQUEST;
} else {
info->max_indirect_segments = min(indirect_segments,
xen_blkif_max_segments);
segs = info->max_indirect_segments;
}
err = fill_grant_buffer(info, (segs + INDIRECT_GREFS(segs)) * BLK_RING_SIZE);
if (err)
goto out_of_memory;
for (i = 0; i < BLK_RING_SIZE; i++) {
info->shadow[i].grants_used = kzalloc(
sizeof(info->shadow[i].grants_used[0]) * segs,
GFP_NOIO);
info->shadow[i].sg = kzalloc(sizeof(info->shadow[i].sg[0]) * segs, GFP_NOIO);
if (info->max_indirect_segments)
info->shadow[i].indirect_grants = kzalloc(
sizeof(info->shadow[i].indirect_grants[0]) *
INDIRECT_GREFS(segs),
GFP_NOIO);
if ((info->shadow[i].grants_used == NULL) ||
(info->shadow[i].sg == NULL) ||
(info->max_indirect_segments &&
(info->shadow[i].indirect_grants == NULL)))
goto out_of_memory;
sg_init_table(info->shadow[i].sg, segs);
}
return 0;
out_of_memory:
for (i = 0; i < BLK_RING_SIZE; i++) {
kfree(info->shadow[i].grants_used);
info->shadow[i].grants_used = NULL;
kfree(info->shadow[i].sg);
info->shadow[i].sg = NULL;
kfree(info->shadow[i].indirect_grants);
info->shadow[i].indirect_grants = NULL;
}
return -ENOMEM;
}
/*
* Invoked when the backend is finally 'ready' (and has told produced
* the details about the physical device - #sectors, size, etc).
@ -1395,6 +1701,7 @@ static void blkfront_connect(struct blkfront_info *info)
{
unsigned long long sectors;
unsigned long sector_size;
unsigned int physical_sector_size;
unsigned int binfo;
int err;
int barrier, flush, discard, persistent;
@ -1414,8 +1721,15 @@ static void blkfront_connect(struct blkfront_info *info)
set_capacity(info->gd, sectors);
revalidate_disk(info->gd);
/* fall through */
return;
case BLKIF_STATE_SUSPENDED:
/*
* If we are recovering from suspension, we need to wait
* for the backend to announce it's features before
* reconnecting, at least we need to know if the backend
* supports indirect descriptors, and how many.
*/
blkif_recover(info);
return;
default:
@ -1437,6 +1751,16 @@ static void blkfront_connect(struct blkfront_info *info)
return;
}
/*
* physcial-sector-size is a newer field, so old backends may not
* provide this. Assume physical sector size to be the same as
* sector_size in that case.
*/
err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
"physical-sector-size", "%u", &physical_sector_size);
if (err != 1)
physical_sector_size = sector_size;
info->feature_flush = 0;
info->flush_op = 0;
@ -1483,7 +1807,15 @@ static void blkfront_connect(struct blkfront_info *info)
else
info->feature_persistent = persistent;
err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
err = blkfront_setup_indirect(info);
if (err) {
xenbus_dev_fatal(info->xbdev, err, "setup_indirect at %s",
info->xbdev->otherend);
return;
}
err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size,
physical_sector_size);
if (err) {
xenbus_dev_fatal(info->xbdev, err, "xlvbd_add at %s",
info->xbdev->otherend);

46
drivers/md/bcache/alloc.c
View File

@ -63,7 +63,10 @@
#include "bcache.h"
#include "btree.h"
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/random.h>
#include <trace/events/bcache.h>
#define MAX_IN_FLIGHT_DISCARDS 8U
@ -151,7 +154,7 @@ static void discard_finish(struct work_struct *w)
mutex_unlock(&ca->set->bucket_lock);
closure_wake_up(&ca->set->bucket_wait);
wake_up(&ca->set->alloc_wait);
wake_up_process(ca->alloc_thread);
closure_put(&ca->set->cl);
}
@ -350,38 +353,30 @@ static void invalidate_buckets(struct cache *ca)
break;
}
pr_debug("free %zu/%zu free_inc %zu/%zu unused %zu/%zu",
fifo_used(&ca->free), ca->free.size,
fifo_used(&ca->free_inc), ca->free_inc.size,
fifo_used(&ca->unused), ca->unused.size);
trace_bcache_alloc_invalidate(ca);
}
#define allocator_wait(ca, cond) \
do { \
DEFINE_WAIT(__wait); \
\
while (1) { \
prepare_to_wait(&ca->set->alloc_wait, \
&__wait, TASK_INTERRUPTIBLE); \
set_current_state(TASK_INTERRUPTIBLE); \
if (cond) \
break; \
\
mutex_unlock(&(ca)->set->bucket_lock); \
if (test_bit(CACHE_SET_STOPPING_2, &ca->set->flags)) { \
finish_wait(&ca->set->alloc_wait, &__wait); \
closure_return(cl); \
} \
if (kthread_should_stop()) \
return 0; \
\
try_to_freeze(); \
schedule(); \
mutex_lock(&(ca)->set->bucket_lock); \
} \
\
finish_wait(&ca->set->alloc_wait, &__wait); \
__set_current_state(TASK_RUNNING); \
} while (0)
void bch_allocator_thread(struct closure *cl)
static int bch_allocator_thread(void *arg)
{
struct cache *ca = container_of(cl, struct cache, alloc);
struct cache *ca = arg;
mutex_lock(&ca->set->bucket_lock);
@ -442,7 +437,7 @@ long bch_bucket_alloc(struct cache *ca, unsigned watermark, struct closure *cl)
{
long r = -1;
again:
wake_up(&ca->set->alloc_wait);
wake_up_process(ca->alloc_thread);
if (fifo_used(&ca->free) > ca->watermark[watermark] &&
fifo_pop(&ca->free, r)) {
@ -476,9 +471,7 @@ again:
return r;
}
pr_debug("alloc failure: blocked %i free %zu free_inc %zu unused %zu",
atomic_read(&ca->set->prio_blocked), fifo_used(&ca->free),
fifo_used(&ca->free_inc), fifo_used(&ca->unused));
trace_bcache_alloc_fail(ca);
if (cl) {
closure_wait(&ca->set->bucket_wait, cl);
@ -552,6 +545,17 @@ int bch_bucket_alloc_set(struct cache_set *c, unsigned watermark,
/* Init */
int bch_cache_allocator_start(struct cache *ca)
{
struct task_struct *k = kthread_run(bch_allocator_thread,
ca, "bcache_allocator");
if (IS_ERR(k))
return PTR_ERR(k);
ca->alloc_thread = k;
return 0;
}
void bch_cache_allocator_exit(struct cache *ca)
{
struct discard *d;

61
drivers/md/bcache/bcache.h
View File

@ -178,7 +178,6 @@
#define pr_fmt(fmt) "bcache: %s() " fmt "\n", __func__
#include <linux/bio.h>
#include <linux/blktrace_api.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/mutex.h>
@ -388,8 +387,6 @@ struct keybuf_key {
typedef bool (keybuf_pred_fn)(struct keybuf *, struct bkey *);
struct keybuf {
keybuf_pred_fn *key_predicate;
struct bkey last_scanned;
spinlock_t lock;
@ -437,9 +434,12 @@ struct bcache_device {
/* If nonzero, we're detaching/unregistering from cache set */
atomic_t detaching;
int flush_done;
uint64_t nr_stripes;
unsigned stripe_size_bits;
atomic_t *stripe_sectors_dirty;
atomic_long_t sectors_dirty;
unsigned long sectors_dirty_gc;
unsigned long sectors_dirty_last;
long sectors_dirty_derivative;
@ -531,6 +531,7 @@ struct cached_dev {
unsigned sequential_merge:1;
unsigned verify:1;
unsigned partial_stripes_expensive:1;
unsigned writeback_metadata:1;
unsigned writeback_running:1;
unsigned char writeback_percent;
@ -565,8 +566,7 @@ struct cache {
unsigned watermark[WATERMARK_MAX];
struct closure alloc;
struct workqueue_struct *alloc_workqueue;
struct task_struct *alloc_thread;
struct closure prio;
struct prio_set *disk_buckets;
@ -664,13 +664,9 @@ struct gc_stat {
* CACHE_SET_STOPPING always gets set first when we're closing down a cache set;
* we'll continue to run normally for awhile with CACHE_SET_STOPPING set (i.e.
* flushing dirty data).
*
* CACHE_SET_STOPPING_2 gets set at the last phase, when it's time to shut down
* the allocation thread.
*/
#define CACHE_SET_UNREGISTERING 0
#define CACHE_SET_STOPPING 1
#define CACHE_SET_STOPPING_2 2
struct cache_set {
struct closure cl;
@ -703,9 +699,6 @@ struct cache_set {
/* For the btree cache */
struct shrinker shrink;
/* For the allocator itself */
wait_queue_head_t alloc_wait;
/* For the btree cache and anything allocation related */
struct mutex bucket_lock;
@ -823,10 +816,9 @@ struct cache_set {
/*
* A btree node on disk could have too many bsets for an iterator to fit
* on the stack - this is a single element mempool for btree_read_work()
* on the stack - have to dynamically allocate them
*/
struct mutex fill_lock;
struct btree_iter *fill_iter;
mempool_t *fill_iter;
/*
* btree_sort() is a merge sort and requires temporary space - single
@ -834,6 +826,7 @@ struct cache_set {
*/
struct mutex sort_lock;
struct bset *sort;
unsigned sort_crit_factor;
/* List of buckets we're currently writing data to */
struct list_head data_buckets;
@ -906,8 +899,6 @@ static inline unsigned local_clock_us(void)
return local_clock() >> 10;
}
#define MAX_BSETS 4U
#define BTREE_PRIO USHRT_MAX
#define INITIAL_PRIO 32768
@ -1112,23 +1103,6 @@ static inline void __bkey_put(struct cache_set *c, struct bkey *k)
atomic_dec_bug(&PTR_BUCKET(c, k, i)->pin);
}
/* Blktrace macros */
#define blktrace_msg(c, fmt, ...) \
do { \
struct request_queue *q = bdev_get_queue(c->bdev); \
if (q) \
blk_add_trace_msg(q, fmt, ##__VA_ARGS__); \
} while (0)
#define blktrace_msg_all(s, fmt, ...) \
do { \
struct cache *_c; \
unsigned i; \
for_each_cache(_c, (s), i) \
blktrace_msg(_c, fmt, ##__VA_ARGS__); \
} while (0)
static inline void cached_dev_put(struct cached_dev *dc)
{
if (atomic_dec_and_test(&dc->count))
@ -1173,10 +1147,16 @@ static inline uint8_t bucket_disk_gen(struct bucket *b)
static struct kobj_attribute ksysfs_##n = \
__ATTR(n, S_IWUSR|S_IRUSR, show, store)
/* Forward declarations */
static inline void wake_up_allocators(struct cache_set *c)
{
struct cache *ca;
unsigned i;
void bch_writeback_queue(struct cached_dev *);
void bch_writeback_add(struct cached_dev *, unsigned);
for_each_cache(ca, c, i)
wake_up_process(ca->alloc_thread);
}
/* Forward declarations */
void bch_count_io_errors(struct cache *, int, const char *);
void bch_bbio_count_io_errors(struct cache_set *, struct bio *,
@ -1193,7 +1173,6 @@ void bch_submit_bbio(struct bio *, struct cache_set *, struct bkey *, unsigned);
uint8_t bch_inc_gen(struct cache *, struct bucket *);
void bch_rescale_priorities(struct cache_set *, int);
bool bch_bucket_add_unused(struct cache *, struct bucket *);
void bch_allocator_thread(struct closure *);
long bch_bucket_alloc(struct cache *, unsigned, struct closure *);
void bch_bucket_free(struct cache_set *, struct bkey *);
@ -1241,9 +1220,9 @@ void bch_cache_set_stop(struct cache_set *);
struct cache_set *bch_cache_set_alloc(struct cache_sb *);
void bch_btree_cache_free(struct cache_set *);
int bch_btree_cache_alloc(struct cache_set *);
void bch_cached_dev_writeback_init(struct cached_dev *);
void bch_moving_init_cache_set(struct cache_set *);
int bch_cache_allocator_start(struct cache *ca);
void bch_cache_allocator_exit(struct cache *ca);
int bch_cache_allocator_init(struct cache *ca);

56
drivers/md/bcache/bset.c
View File

@ -78,6 +78,7 @@ struct bkey *bch_keylist_pop(struct keylist *l)
bool __bch_ptr_invalid(struct cache_set *c, int level, const struct bkey *k)
{
unsigned i;
char buf[80];
if (level && (!KEY_PTRS(k) || !KEY_SIZE(k) || KEY_DIRTY(k)))
goto bad;
@ -102,7 +103,8 @@ bool __bch_ptr_invalid(struct cache_set *c, int level, const struct bkey *k)
return false;
bad:
cache_bug(c, "spotted bad key %s: %s", pkey(k), bch_ptr_status(c, k));
bch_bkey_to_text(buf, sizeof(buf), k);
cache_bug(c, "spotted bad key %s: %s", buf, bch_ptr_status(c, k));
return true;
}
@ -162,10 +164,16 @@ bool bch_ptr_bad(struct btree *b, const struct bkey *k)
#ifdef CONFIG_BCACHE_EDEBUG
bug:
mutex_unlock(&b->c->bucket_lock);
btree_bug(b,
{
char buf[80];
bch_bkey_to_text(buf, sizeof(buf), k);
btree_bug(b,
"inconsistent pointer %s: bucket %zu pin %i prio %i gen %i last_gc %i mark %llu gc_gen %i",
pkey(k), PTR_BUCKET_NR(b->c, k, i), atomic_read(&g->pin),
g->prio, g->gen, g->last_gc, GC_MARK(g), g->gc_gen);
buf, PTR_BUCKET_NR(b->c, k, i), atomic_read(&g->pin),
g->prio, g->gen, g->last_gc, GC_MARK(g), g->gc_gen);
}
return true;
#endif
}
@ -1084,33 +1092,39 @@ void bch_btree_sort_into(struct btree *b, struct btree *new)
new->sets->size = 0;
}
#define SORT_CRIT (4096 / sizeof(uint64_t))
void bch_btree_sort_lazy(struct btree *b)
{
if (b->nsets) {
unsigned i, j, keys = 0, total;
unsigned crit = SORT_CRIT;
int i;
for (i = 0; i <= b->nsets; i++)
keys += b->sets[i].data->keys;
/* Don't sort if nothing to do */
if (!b->nsets)
goto out;
total = keys;
/* If not a leaf node, always sort */
if (b->level) {
bch_btree_sort(b);
return;
}
for (j = 0; j < b->nsets; j++) {
if (keys * 2 < total ||
keys < 1000) {
bch_btree_sort_partial(b, j);
return;
}
for (i = b->nsets - 1; i >= 0; --i) {
crit *= b->c->sort_crit_factor;
keys -= b->sets[j].data->keys;
}
/* Must sort if b->nsets == 3 or we'll overflow */
if (b->nsets >= (MAX_BSETS - 1) - b->level) {
bch_btree_sort(b);
if (b->sets[i].data->keys < crit) {
bch_btree_sort_partial(b, i);
return;
}
}
/* Sort if we'd overflow */
if (b->nsets + 1 == MAX_BSETS) {
bch_btree_sort(b);
return;
}
out:
bset_build_written_tree(b);
}

4
drivers/md/bcache/bset.h
View File

@ -1,6 +1,8 @@
#ifndef _BCACHE_BSET_H
#define _BCACHE_BSET_H
#include <linux/slab.h>
/*
* BKEYS:
*
@ -142,6 +144,8 @@
/* Btree key comparison/iteration */
#define MAX_BSETS 4U
struct btree_iter {
size_t size, used;
struct btree_iter_set {

453
drivers/md/bcache/btree.c
View File

@ -24,6 +24,7 @@
#include "btree.h"
#include "debug.h"
#include "request.h"
#include "writeback.h"
#include <linux/slab.h>
#include <linux/bitops.h>
@ -134,44 +135,17 @@ static uint64_t btree_csum_set(struct btree *b, struct bset *i)
return crc ^ 0xffffffffffffffffULL;
}
static void btree_bio_endio(struct bio *bio, int error)
static void bch_btree_node_read_done(struct btree *b)
{
struct closure *cl = bio->bi_private;
struct btree *b = container_of(cl, struct btree, io.cl);
if (error)
set_btree_node_io_error(b);
bch_bbio_count_io_errors(b->c, bio, error, (bio->bi_rw & WRITE)
? "writing btree" : "reading btree");
closure_put(cl);
}
static void btree_bio_init(struct btree *b)
{
BUG_ON(b->bio);
b->bio = bch_bbio_alloc(b->c);
b->bio->bi_end_io = btree_bio_endio;
b->bio->bi_private = &b->io.cl;
}
void bch_btree_read_done(struct closure *cl)
{
struct btree *b = container_of(cl, struct btree, io.cl);
struct bset *i = b->sets[0].data;
struct btree_iter *iter = b->c->fill_iter;
const char *err = "bad btree header";
BUG_ON(b->nsets || b->written);
struct bset *i = b->sets[0].data;
struct btree_iter *iter;
bch_bbio_free(b->bio, b->c);
b->bio = NULL;
mutex_lock(&b->c->fill_lock);
iter = mempool_alloc(b->c->fill_iter, GFP_NOWAIT);
iter->size = b->c->sb.bucket_size / b->c->sb.block_size;
iter->used = 0;
if (btree_node_io_error(b) ||
!i->seq)
if (!i->seq)
goto err;
for (;
@ -228,17 +202,8 @@ void bch_btree_read_done(struct closure *cl)
if (b->written < btree_blocks(b))
bch_bset_init_next(b);
out:
mutex_unlock(&b->c->fill_lock);
spin_lock(&b->c->btree_read_time_lock);
bch_time_stats_update(&b->c->btree_read_time, b->io_start_time);
spin_unlock(&b->c->btree_read_time_lock);
smp_wmb(); /* read_done is our write lock */
set_btree_node_read_done(b);
closure_return(cl);
mempool_free(iter, b->c->fill_iter);
return;
err:
set_btree_node_io_error(b);
bch_cache_set_error(b->c, "%s at bucket %zu, block %zu, %u keys",
@ -247,48 +212,69 @@ err:
goto out;
}
void bch_btree_read(struct btree *b)
static void btree_node_read_endio(struct bio *bio, int error)
{
BUG_ON(b->nsets || b->written);
struct closure *cl = bio->bi_private;
closure_put(cl);
}
if (!closure_trylock(&b->io.cl, &b->c->cl))
BUG();
void bch_btree_node_read(struct btree *b)
{
uint64_t start_time = local_clock();
struct closure cl;
struct bio *bio;
b->io_start_time = local_clock();
trace_bcache_btree_read(b);
btree_bio_init(b);
b->bio->bi_rw = REQ_META|READ_SYNC;
b->bio->bi_size = KEY_SIZE(&b->key) << 9;
closure_init_stack(&cl);
bch_bio_map(b->bio, b->sets[0].data);
bio = bch_bbio_alloc(b->c);
bio->bi_rw = REQ_META|READ_SYNC;
bio->bi_size = KEY_SIZE(&b->key) << 9;
bio->bi_end_io = btree_node_read_endio;
bio->bi_private = &cl;
pr_debug("%s", pbtree(b));
trace_bcache_btree_read(b->bio);
bch_submit_bbio(b->bio, b->c, &b->key, 0);
bch_bio_map(bio, b->sets[0].data);
continue_at(&b->io.cl, bch_btree_read_done, system_wq);
bch_submit_bbio(bio, b->c, &b->key, 0);
closure_sync(&cl);
if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
set_btree_node_io_error(b);
bch_bbio_free(bio, b->c);
if (btree_node_io_error(b))
goto err;
bch_btree_node_read_done(b);
spin_lock(&b->c->btree_read_time_lock);
bch_time_stats_update(&b->c->btree_read_time, start_time);
spin_unlock(&b->c->btree_read_time_lock);
return;
err:
bch_cache_set_error(b->c, "io error reading bucket %lu",
PTR_BUCKET_NR(b->c, &b->key, 0));
}
static void btree_complete_write(struct btree *b, struct btree_write *w)
{
if (w->prio_blocked &&
!atomic_sub_return(w->prio_blocked, &b->c->prio_blocked))
wake_up(&b->c->alloc_wait);
wake_up_allocators(b->c);
if (w->journal) {
atomic_dec_bug(w->journal);
__closure_wake_up(&b->c->journal.wait);
}
if (w->owner)
closure_put(w->owner);
w->prio_blocked = 0;
w->journal = NULL;
w->owner = NULL;
}
static void __btree_write_done(struct closure *cl)
static void __btree_node_write_done(struct closure *cl)
{
struct btree *b = container_of(cl, struct btree, io.cl);
struct btree_write *w = btree_prev_write(b);
@ -304,7 +290,7 @@ static void __btree_write_done(struct closure *cl)
closure_return(cl);
}
static void btree_write_done(struct closure *cl)
static void btree_node_write_done(struct closure *cl)
{
struct btree *b = container_of(cl, struct btree, io.cl);
struct bio_vec *bv;
@ -313,10 +299,22 @@ static void btree_write_done(struct closure *cl)
__bio_for_each_segment(bv, b->bio, n, 0)
__free_page(bv->bv_page);
__btree_write_done(cl);
__btree_node_write_done(cl);
}
static void do_btree_write(struct btree *b)
static void btree_node_write_endio(struct bio *bio, int error)
{
struct closure *cl = bio->bi_private;
struct btree *b = container_of(cl, struct btree, io.cl);
if (error)
set_btree_node_io_error(b);
bch_bbio_count_io_errors(b->c, bio, error, "writing btree");
closure_put(cl);
}
static void do_btree_node_write(struct btree *b)
{
struct closure *cl = &b->io.cl;
struct bset *i = b->sets[b->nsets].data;
@ -325,15 +323,34 @@ static void do_btree_write(struct btree *b)
i->version = BCACHE_BSET_VERSION;
i->csum = btree_csum_set(b, i);
btree_bio_init(b);
b->bio->bi_rw = REQ_META|WRITE_SYNC;
b->bio->bi_size = set_blocks(i, b->c) * block_bytes(b->c);
BUG_ON(b->bio);
b->bio = bch_bbio_alloc(b->c);
b->bio->bi_end_io = btree_node_write_endio;
b->bio->bi_private = &b->io.cl;
b->bio->bi_rw = REQ_META|WRITE_SYNC|REQ_FUA;
b->bio->bi_size = set_blocks(i, b->c) * block_bytes(b->c);
bch_bio_map(b->bio, i);
/*
* If we're appending to a leaf node, we don't technically need FUA -
* this write just needs to be persisted before the next journal write,
* which will be marked FLUSH|FUA.
*
* Similarly if we're writing a new btree root - the pointer is going to
* be in the next journal entry.
*
* But if we're writing a new btree node (that isn't a root) or
* appending to a non leaf btree node, we need either FUA or a flush
* when we write the parent with the new pointer. FUA is cheaper than a
* flush, and writes appending to leaf nodes aren't blocking anything so
* just make all btree node writes FUA to keep things sane.
*/
bkey_copy(&k.key, &b->key);
SET_PTR_OFFSET(&k.key, 0, PTR_OFFSET(&k.key, 0) + bset_offset(b, i));
if (!bch_bio_alloc_pages(b->bio, GFP_NOIO)) {
if (!bio_alloc_pages(b->bio, GFP_NOIO)) {
int j;
struct bio_vec *bv;
void *base = (void *) ((unsigned long) i & ~(PAGE_SIZE - 1));
@ -342,40 +359,41 @@ static void do_btree_write(struct btree *b)
memcpy(page_address(bv->bv_page),
base + j * PAGE_SIZE, PAGE_SIZE);
trace_bcache_btree_write(b->bio);
bch_submit_bbio(b->bio, b->c, &k.key, 0);
continue_at(cl, btree_write_done, NULL);
continue_at(cl, btree_node_write_done, NULL);
} else {
b->bio->bi_vcnt = 0;
bch_bio_map(b->bio, i);
trace_bcache_btree_write(b->bio);
bch_submit_bbio(b->bio, b->c, &k.key, 0);
closure_sync(cl);
__btree_write_done(cl);
__btree_node_write_done(cl);
}
}
static void __btree_write(struct btree *b)
void bch_btree_node_write(struct btree *b, struct closure *parent)
{
struct bset *i = b->sets[b->nsets].data;
BUG_ON(current->bio_list);
trace_bcache_btree_write(b);
BUG_ON(current->bio_list);
BUG_ON(b->written >= btree_blocks(b));
BUG_ON(b->written && !i->keys);
BUG_ON(b->sets->data->seq != i->seq);
bch_check_key_order(b, i);
closure_lock(&b->io, &b->c->cl);
cancel_delayed_work(&b->work);
/* If caller isn't waiting for write, parent refcount is cache set */
closure_lock(&b->io, parent ?: &b->c->cl);
clear_bit(BTREE_NODE_dirty, &b->flags);
change_bit(BTREE_NODE_write_idx, &b->flags);
bch_check_key_order(b, i);
BUG_ON(b->written && !i->keys);
do_btree_write(b);
pr_debug("%s block %i keys %i", pbtree(b), b->written, i->keys);
do_btree_node_write(b);
b->written += set_blocks(i, b->c);
atomic_long_add(set_blocks(i, b->c) * b->c->sb.block_size,
@ -387,37 +405,31 @@ static void __btree_write(struct btree *b)
bch_bset_init_next(b);
}
static void btree_write_work(struct work_struct *w)
static void btree_node_write_work(struct work_struct *w)
{
struct btree *b = container_of(to_delayed_work(w), struct btree, work);
down_write(&b->lock);
rw_lock(true, b, b->level);
if (btree_node_dirty(b))
__btree_write(b);
up_write(&b->lock);
bch_btree_node_write(b, NULL);
rw_unlock(true, b);
}
void bch_btree_write(struct btree *b, bool now, struct btree_op *op)
static void bch_btree_leaf_dirty(struct btree *b, struct btree_op *op)
{
struct bset *i = b->sets[b->nsets].data;
struct btree_write *w = btree_current_write(b);
BUG_ON(b->written &&
(b->written >= btree_blocks(b) ||
i->seq != b->sets[0].data->seq ||
!i->keys));
BUG_ON(!b->written);
BUG_ON(!i->keys);
if (!btree_node_dirty(b)) {
set_btree_node_dirty(b);
queue_delayed_work(btree_io_wq, &b->work,
msecs_to_jiffies(30000));
}
if (!btree_node_dirty(b))
queue_delayed_work(btree_io_wq, &b->work, 30 * HZ);
w->prio_blocked += b->prio_blocked;
b->prio_blocked = 0;
set_btree_node_dirty(b);
if (op && op->journal && !b->level) {
if (op && op->journal) {
if (w->journal &&
journal_pin_cmp(b->c, w, op)) {
atomic_dec_bug(w->journal);
@ -430,23 +442,10 @@ void bch_btree_write(struct btree *b, bool now, struct btree_op *op)
}
}
if (current->bio_list)
return;
/* Force write if set is too big */
if (now ||
b->level ||
set_bytes(i) > PAGE_SIZE - 48) {
if (op && now) {
/* Must wait on multiple writes */
BUG_ON(w->owner);
w->owner = &op->cl;
closure_get(&op->cl);
}
__btree_write(b);
}
BUG_ON(!b->written);
if (set_bytes(i) > PAGE_SIZE - 48 &&
!current->bio_list)
bch_btree_node_write(b, NULL);
}
/*
@ -559,7 +558,7 @@ static struct btree *mca_bucket_alloc(struct cache_set *c,
init_rwsem(&b->lock);
lockdep_set_novalidate_class(&b->lock);
INIT_LIST_HEAD(&b->list);
INIT_DELAYED_WORK(&b->work, btree_write_work);
INIT_DELAYED_WORK(&b->work, btree_node_write_work);
b->c = c;
closure_init_unlocked(&b->io);
@ -582,7 +581,7 @@ static int mca_reap(struct btree *b, struct closure *cl, unsigned min_order)
BUG_ON(btree_node_dirty(b) && !b->sets[0].data);
if (cl && btree_node_dirty(b))
bch_btree_write(b, true, NULL);
bch_btree_node_write(b, NULL);
if (cl)
closure_wait_event_async(&b->io.wait, cl,
@ -623,6 +622,13 @@ static int bch_mca_shrink(struct shrinker *shrink, struct shrink_control *sc)
else if (!mutex_trylock(&c->bucket_lock))
return -1;
/*
* It's _really_ critical that we don't free too many btree nodes - we
* have to always leave ourselves a reserve. The reserve is how we
* guarantee that allocating memory for a new btree node can always
* succeed, so that inserting keys into the btree can always succeed and
* IO can always make forward progress:
*/
nr /= c->btree_pages;
nr = min_t(unsigned long, nr, mca_can_free(c));
@ -766,6 +772,8 @@ static struct btree *mca_cannibalize(struct cache_set *c, struct bkey *k,
int ret = -ENOMEM;
struct btree *i;
trace_bcache_btree_cache_cannibalize(c);
if (!cl)
return ERR_PTR(-ENOMEM);
@ -784,7 +792,6 @@ static struct btree *mca_cannibalize(struct cache_set *c, struct bkey *k,
return ERR_PTR(-EAGAIN);
}
/* XXX: tracepoint */
c->try_harder = cl;
c->try_harder_start = local_clock();
retry:
@ -905,6 +912,9 @@ retry:
b = mca_find(c, k);
if (!b) {
if (current->bio_list)
return ERR_PTR(-EAGAIN);
mutex_lock(&c->bucket_lock);
b = mca_alloc(c, k, level, &op->cl);
mutex_unlock(&c->bucket_lock);
@ -914,7 +924,7 @@ retry:
if (IS_ERR(b))
return b;
bch_btree_read(b);
bch_btree_node_read(b);
if (!write)
downgrade_write(&b->lock);
@ -937,15 +947,12 @@ retry:
for (; i <= b->nsets; i++)
prefetch(b->sets[i].data);
if (!closure_wait_event(&b->io.wait, &op->cl,
btree_node_read_done(b))) {
if (btree_node_io_error(b)) {
rw_unlock(write, b);
b = ERR_PTR(-EAGAIN);
} else if (btree_node_io_error(b)) {
rw_unlock(write, b);
b = ERR_PTR(-EIO);
} else
BUG_ON(!b->written);
return ERR_PTR(-EIO);
}
BUG_ON(!b->written);
return b;
}
@ -959,7 +966,7 @@ static void btree_node_prefetch(struct cache_set *c, struct bkey *k, int level)
mutex_unlock(&c->bucket_lock);
if (!IS_ERR_OR_NULL(b)) {
bch_btree_read(b);
bch_btree_node_read(b);
rw_unlock(true, b);
}
}
@ -970,24 +977,19 @@ static void btree_node_free(struct btree *b, struct btree_op *op)
{
unsigned i;
trace_bcache_btree_node_free(b);
/*
* The BUG_ON() in btree_node_get() implies that we must have a write
* lock on parent to free or even invalidate a node
*/
BUG_ON(op->lock <= b->level);
BUG_ON(b == b->c->root);
pr_debug("bucket %s", pbtree(b));
if (btree_node_dirty(b))
btree_complete_write(b, btree_current_write(b));
clear_bit(BTREE_NODE_dirty, &b->flags);
if (b->prio_blocked &&
!atomic_sub_return(b->prio_blocked, &b->c->prio_blocked))
wake_up(&b->c->alloc_wait);
b->prio_blocked = 0;
cancel_delayed_work(&b->work);
mutex_lock(&b->c->bucket_lock);
@ -1028,17 +1030,20 @@ retry:
goto retry;
}
set_btree_node_read_done(b);
b->accessed = 1;
bch_bset_init_next(b);
mutex_unlock(&c->bucket_lock);
trace_bcache_btree_node_alloc(b);
return b;
err_free:
bch_bucket_free(c, &k.key);
__bkey_put(c, &k.key);
err:
mutex_unlock(&c->bucket_lock);
trace_bcache_btree_node_alloc_fail(b);
return b;
}
@ -1137,11 +1142,8 @@ static int btree_gc_mark_node(struct btree *b, unsigned *keys,
gc->nkeys++;
gc->data += KEY_SIZE(k);
if (KEY_DIRTY(k)) {
if (KEY_DIRTY(k))
gc->dirty += KEY_SIZE(k);
if (d)
d->sectors_dirty_gc += KEY_SIZE(k);
}
}
for (t = b->sets; t <= &b->sets[b->nsets]; t++)
@ -1166,14 +1168,11 @@ static struct btree *btree_gc_alloc(struct btree *b, struct bkey *k,
if (!IS_ERR_OR_NULL(n)) {
swap(b, n);
__bkey_put(b->c, &b->key);
memcpy(k->ptr, b->key.ptr,
sizeof(uint64_t) * KEY_PTRS(&b->key));
__bkey_put(b->c, &b->key);
atomic_inc(&b->c->prio_blocked);
b->prio_blocked++;
btree_node_free(n, op);
up_write(&n->lock);
}
@ -1278,7 +1277,7 @@ static void btree_gc_coalesce(struct btree *b, struct btree_op *op,
btree_node_free(r->b, op);
up_write(&r->b->lock);
pr_debug("coalesced %u nodes", nodes);
trace_bcache_btree_gc_coalesce(nodes);
gc->nodes--;
nodes--;
@ -1293,14 +1292,9 @@ static int btree_gc_recurse(struct btree *b, struct btree_op *op,
void write(struct btree *r)
{
if (!r->written)
bch_btree_write(r, true, op);
else if (btree_node_dirty(r)) {
BUG_ON(btree_current_write(r)->owner);
btree_current_write(r)->owner = writes;
closure_get(writes);
bch_btree_write(r, true, NULL);
}
bch_btree_node_write(r, &op->cl);
else if (btree_node_dirty(r))
bch_btree_node_write(r, writes);
up_write(&r->lock);
}
@ -1386,9 +1380,7 @@ static int bch_btree_gc_root(struct btree *b, struct btree_op *op,
ret = btree_gc_recurse(b, op, writes, gc);
if (!b->written || btree_node_dirty(b)) {
atomic_inc(&b->c->prio_blocked);
b->prio_blocked++;
bch_btree_write(b, true, n ? op : NULL);
bch_btree_node_write(b, n ? &op->cl : NULL);
}
if (!IS_ERR_OR_NULL(n)) {
@ -1405,7 +1397,6 @@ static void btree_gc_start(struct cache_set *c)
{
struct cache *ca;
struct bucket *b;
struct bcache_device **d;
unsigned i;
if (!c->gc_mark_valid)
@ -1419,16 +1410,12 @@ static void btree_gc_start(struct cache_set *c)
for_each_cache(ca, c, i)
for_each_bucket(b, ca) {
b->gc_gen = b->gen;
if (!atomic_read(&b->pin))
if (!atomic_read(&b->pin)) {
SET_GC_MARK(b, GC_MARK_RECLAIMABLE);
SET_GC_SECTORS_USED(b, 0);
}
}
for (d = c->devices;
d < c->devices + c->nr_uuids;
d++)
if (*d)
(*d)->sectors_dirty_gc = 0;
mutex_unlock(&c->bucket_lock);
}
@ -1437,7 +1424,6 @@ size_t bch_btree_gc_finish(struct cache_set *c)
size_t available = 0;
struct bucket *b;
struct cache *ca;
struct bcache_device **d;
unsigned i;
mutex_lock(&c->bucket_lock);
@ -1480,22 +1466,6 @@ size_t bch_btree_gc_finish(struct cache_set *c)
}
}
for (d = c->devices;
d < c->devices + c->nr_uuids;
d++)
if (*d) {
unsigned long last =
atomic_long_read(&((*d)->sectors_dirty));
long difference = (*d)->sectors_dirty_gc - last;
pr_debug("sectors dirty off by %li", difference);
(*d)->sectors_dirty_last += difference;
atomic_long_set(&((*d)->sectors_dirty),
(*d)->sectors_dirty_gc);
}
mutex_unlock(&c->bucket_lock);
return available;
}
@ -1508,10 +1478,9 @@ static void bch_btree_gc(struct closure *cl)
struct gc_stat stats;
struct closure writes;
struct btree_op op;
uint64_t start_time = local_clock();
trace_bcache_gc_start(c->sb.set_uuid);
blktrace_msg_all(c, "Starting gc");
trace_bcache_gc_start(c);
memset(&stats, 0, sizeof(struct gc_stat));
closure_init_stack(&writes);
@ -1520,14 +1489,14 @@ static void bch_btree_gc(struct closure *cl)
btree_gc_start(c);
atomic_inc(&c->prio_blocked);
ret = btree_root(gc_root, c, &op, &writes, &stats);
closure_sync(&op.cl);
closure_sync(&writes);
if (ret) {
blktrace_msg_all(c, "Stopped gc");
pr_warn("gc failed!");
continue_at(cl, bch_btree_gc, bch_gc_wq);
}
@ -1537,6 +1506,9 @@ static void bch_btree_gc(struct closure *cl)
available = bch_btree_gc_finish(c);
atomic_dec(&c->prio_blocked);
wake_up_allocators(c);
bch_time_stats_update(&c->btree_gc_time, start_time);
stats.key_bytes *= sizeof(uint64_t);
@ -1544,10 +1516,8 @@ static void bch_btree_gc(struct closure *cl)
stats.data <<= 9;
stats.in_use = (c->nbuckets - available) * 100 / c->nbuckets;
memcpy(&c->gc_stats, &stats, sizeof(struct gc_stat));
blktrace_msg_all(c, "Finished gc");
trace_bcache_gc_end(c->sb.set_uuid);
wake_up(&c->alloc_wait);
trace_bcache_gc_end(c);
continue_at(cl, bch_moving_gc, bch_gc_wq);
}
@ -1654,14 +1624,14 @@ static bool fix_overlapping_extents(struct btree *b,
struct btree_iter *iter,
struct btree_op *op)
{
void subtract_dirty(struct bkey *k, int sectors)
void subtract_dirty(struct bkey *k, uint64_t offset, int sectors)
{
struct bcache_device *d = b->c->devices[KEY_INODE(k)];
if (KEY_DIRTY(k) && d)
atomic_long_sub(sectors, &d->sectors_dirty);
if (KEY_DIRTY(k))
bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k),
offset, -sectors);
}
uint64_t old_offset;
unsigned old_size, sectors_found = 0;
while (1) {
@ -1673,6 +1643,7 @@ static bool fix_overlapping_extents(struct btree *b,
if (bkey_cmp(k, &START_KEY(insert)) <= 0)
continue;
old_offset = KEY_START(k);
old_size = KEY_SIZE(k);
/*
@ -1728,7 +1699,7 @@ static bool fix_overlapping_extents(struct btree *b,
struct bkey *top;
subtract_dirty(k, KEY_SIZE(insert));
subtract_dirty(k, KEY_START(insert), KEY_SIZE(insert));
if (bkey_written(b, k)) {
/*
@ -1775,7 +1746,7 @@ static bool fix_overlapping_extents(struct btree *b,
}
}
subtract_dirty(k, old_size - KEY_SIZE(k));
subtract_dirty(k, old_offset, old_size - KEY_SIZE(k));
}
check_failed:
@ -1798,7 +1769,7 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
{
struct bset *i = b->sets[b->nsets].data;
struct bkey *m, *prev;
const char *status = "insert";
unsigned status = BTREE_INSERT_STATUS_INSERT;
BUG_ON(bkey_cmp(k, &b->key) > 0);
BUG_ON(b->level && !KEY_PTRS(k));
@ -1831,17 +1802,17 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
goto insert;
/* prev is in the tree, if we merge we're done */
status = "back merging";
status = BTREE_INSERT_STATUS_BACK_MERGE;
if (prev &&
bch_bkey_try_merge(b, prev, k))
goto merged;
status = "overwrote front";
status = BTREE_INSERT_STATUS_OVERWROTE;
if (m != end(i) &&
KEY_PTRS(m) == KEY_PTRS(k) && !KEY_SIZE(m))
goto copy;
status = "front merge";
status = BTREE_INSERT_STATUS_FRONT_MERGE;
if (m != end(i) &&
bch_bkey_try_merge(b, k, m))
goto copy;
@ -1851,21 +1822,21 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
insert: shift_keys(b, m, k);
copy: bkey_copy(m, k);
merged:
bch_check_keys(b, "%s for %s at %s: %s", status,
op_type(op), pbtree(b), pkey(k));
bch_check_key_order_msg(b, i, "%s for %s at %s: %s", status,
op_type(op), pbtree(b), pkey(k));
if (KEY_DIRTY(k))
bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k),
KEY_START(k), KEY_SIZE(k));
bch_check_keys(b, "%u for %s", status, op_type(op));
if (b->level && !KEY_OFFSET(k))
b->prio_blocked++;
btree_current_write(b)->prio_blocked++;
pr_debug("%s for %s at %s: %s", status,
op_type(op), pbtree(b), pkey(k));
trace_bcache_btree_insert_key(b, k, op->type, status);
return true;
}
bool bch_btree_insert_keys(struct btree *b, struct btree_op *op)
static bool bch_btree_insert_keys(struct btree *b, struct btree_op *op)
{
bool ret = false;
struct bkey *k;
@ -1896,7 +1867,7 @@ bool bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
should_split(b))
goto out;
op->replace = KEY(op->inode, bio_end(bio), bio_sectors(bio));
op->replace = KEY(op->inode, bio_end_sector(bio), bio_sectors(bio));
SET_KEY_PTRS(&op->replace, 1);
get_random_bytes(&op->replace.ptr[0], sizeof(uint64_t));
@ -1907,7 +1878,6 @@ bool bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
BUG_ON(op->type != BTREE_INSERT);
BUG_ON(!btree_insert_key(b, op, &tmp.k));
bch_btree_write(b, false, NULL);
ret = true;
out:
downgrade_write(&b->lock);
@ -1929,12 +1899,11 @@ static int btree_split(struct btree *b, struct btree_op *op)
split = set_blocks(n1->sets[0].data, n1->c) > (btree_blocks(b) * 4) / 5;
pr_debug("%ssplitting at %s keys %i", split ? "" : "not ",
pbtree(b), n1->sets[0].data->keys);
if (split) {
unsigned keys = 0;
trace_bcache_btree_node_split(b, n1->sets[0].data->keys);
n2 = bch_btree_node_alloc(b->c, b->level, &op->cl);
if (IS_ERR(n2))
goto err_free1;
@ -1967,18 +1936,21 @@ static int btree_split(struct btree *b, struct btree_op *op)
bkey_copy_key(&n2->key, &b->key);
bch_keylist_add(&op->keys, &n2->key);
bch_btree_write(n2, true, op);
bch_btree_node_write(n2, &op->cl);
rw_unlock(true, n2);
} else
} else {
trace_bcache_btree_node_compact(b, n1->sets[0].data->keys);
bch_btree_insert_keys(n1, op);
}
bch_keylist_add(&op->keys, &n1->key);
bch_btree_write(n1, true, op);
bch_btree_node_write(n1, &op->cl);
if (n3) {
bkey_copy_key(&n3->key, &MAX_KEY);
bch_btree_insert_keys(n3, op);
bch_btree_write(n3, true, op);
bch_btree_node_write(n3, &op->cl);
closure_sync(&op->cl);
bch_btree_set_root(n3);
@ -2082,8 +2054,12 @@ static int bch_btree_insert_recurse(struct btree *b, struct btree_op *op,
BUG_ON(write_block(b) != b->sets[b->nsets].data);
if (bch_btree_insert_keys(b, op))
bch_btree_write(b, false, op);
if (bch_btree_insert_keys(b, op)) {
if (!b->level)
bch_btree_leaf_dirty(b, op);
else
bch_btree_node_write(b, &op->cl);
}
}
return 0;
@ -2140,6 +2116,11 @@ int bch_btree_insert(struct btree_op *op, struct cache_set *c)
void bch_btree_set_root(struct btree *b)
{
unsigned i;
struct closure cl;
closure_init_stack(&cl);
trace_bcache_btree_set_root(b);
BUG_ON(!b->written);
@ -2153,8 +2134,8 @@ void bch_btree_set_root(struct btree *b)
b->c->root = b;
__bkey_put(b->c, &b->key);
bch_journal_meta(b->c, NULL);
pr_debug("%s for %pf", pbtree(b), __builtin_return_address(0));
bch_journal_meta(b->c, &cl);
closure_sync(&cl);
}
/* Cache lookup */
@ -2215,9 +2196,6 @@ static int submit_partial_cache_hit(struct btree *b, struct btree_op *op,
KEY_OFFSET(k) - bio->bi_sector);
n = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
if (!n)
return -EAGAIN;
if (n == bio)
op->lookup_done = true;
@ -2240,7 +2218,6 @@ static int submit_partial_cache_hit(struct btree *b, struct btree_op *op,
n->bi_end_io = bch_cache_read_endio;
n->bi_private = &s->cl;
trace_bcache_cache_hit(n);
__bch_submit_bbio(n, b->c);
}
@ -2257,9 +2234,6 @@ int bch_btree_search_recurse(struct btree *b, struct btree_op *op)
struct btree_iter iter;
bch_btree_iter_init(b, &iter, &KEY(op->inode, bio->bi_sector, 0));
pr_debug("at %s searching for %u:%llu", pbtree(b), op->inode,
(uint64_t) bio->bi_sector);
do {
k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad);
if (!k) {
@ -2303,7 +2277,8 @@ static inline int keybuf_nonoverlapping_cmp(struct keybuf_key *l,
}
static int bch_btree_refill_keybuf(struct btree *b, struct btree_op *op,
struct keybuf *buf, struct bkey *end)
struct keybuf *buf, struct bkey *end,
keybuf_pred_fn *pred)
{
struct btree_iter iter;
bch_btree_iter_init(b, &iter, &buf->last_scanned);
@ -2322,11 +2297,9 @@ static int bch_btree_refill_keybuf(struct btree *b, struct btree_op *op,
if (bkey_cmp(&buf->last_scanned, end) >= 0)
break;
if (buf->key_predicate(buf, k)) {
if (pred(buf, k)) {
struct keybuf_key *w;
pr_debug("%s", pkey(k));
spin_lock(&buf->lock);
w = array_alloc(&buf->freelist);
@ -2343,7 +2316,7 @@ static int bch_btree_refill_keybuf(struct btree *b, struct btree_op *op,
if (!k)
break;
btree(refill_keybuf, k, b, op, buf, end);
btree(refill_keybuf, k, b, op, buf, end, pred);
/*
* Might get an error here, but can't really do anything
* and it'll get logged elsewhere. Just read what we
@ -2361,7 +2334,7 @@ static int bch_btree_refill_keybuf(struct btree *b, struct btree_op *op,
}
void bch_refill_keybuf(struct cache_set *c, struct keybuf *buf,
struct bkey *end)
struct bkey *end, keybuf_pred_fn *pred)
{
struct bkey start = buf->last_scanned;
struct btree_op op;
@ -2369,7 +2342,7 @@ void bch_refill_keybuf(struct cache_set *c, struct keybuf *buf,
cond_resched();
btree_root(refill_keybuf, c, &op, buf, end);
btree_root(refill_keybuf, c, &op, buf, end, pred);
closure_sync(&op.cl);
pr_debug("found %s keys from %llu:%llu to %llu:%llu",
@ -2455,7 +2428,8 @@ struct keybuf_key *bch_keybuf_next(struct keybuf *buf)
struct keybuf_key *bch_keybuf_next_rescan(struct cache_set *c,
struct keybuf *buf,
struct bkey *end)
struct bkey *end,
keybuf_pred_fn *pred)
{
struct keybuf_key *ret;
@ -2469,15 +2443,14 @@ struct keybuf_key *bch_keybuf_next_rescan(struct cache_set *c,
break;
}
bch_refill_keybuf(c, buf, end);
bch_refill_keybuf(c, buf, end, pred);
}
return ret;
}
void bch_keybuf_init(struct keybuf *buf, keybuf_pred_fn *fn)
void bch_keybuf_init(struct keybuf *buf)
{
buf->key_predicate = fn;
buf->last_scanned = MAX_KEY;
buf->keys = RB_ROOT;

35
drivers/md/bcache/btree.h
View File

@ -102,7 +102,6 @@
#include "debug.h"
struct btree_write {
struct closure *owner;
atomic_t *journal;
/* If btree_split() frees a btree node, it writes a new pointer to that
@ -142,16 +141,12 @@ struct btree {
*/
struct bset_tree sets[MAX_BSETS];
/* Used to refcount bio splits, also protects b->bio */
/* For outstanding btree writes, used as a lock - protects write_idx */
struct closure_with_waitlist io;
/* Gets transferred to w->prio_blocked - see the comment there */
int prio_blocked;
struct list_head list;
struct delayed_work work;
uint64_t io_start_time;
struct btree_write writes[2];
struct bio *bio;
};
@ -164,13 +159,11 @@ static inline void set_btree_node_ ## flag(struct btree *b) \
{ set_bit(BTREE_NODE_ ## flag, &b->flags); } \
enum btree_flags {
BTREE_NODE_read_done,
BTREE_NODE_io_error,
BTREE_NODE_dirty,
BTREE_NODE_write_idx,
};
BTREE_FLAG(read_done);
BTREE_FLAG(io_error);
BTREE_FLAG(dirty);
BTREE_FLAG(write_idx);
@ -278,6 +271,13 @@ struct btree_op {
BKEY_PADDED(replace);
};
enum {
BTREE_INSERT_STATUS_INSERT,
BTREE_INSERT_STATUS_BACK_MERGE,
BTREE_INSERT_STATUS_OVERWROTE,
BTREE_INSERT_STATUS_FRONT_MERGE,
};
void bch_btree_op_init_stack(struct btree_op *);
static inline void rw_lock(bool w, struct btree *b, int level)
@ -293,9 +293,7 @@ static inline void rw_unlock(bool w, struct btree *b)
#ifdef CONFIG_BCACHE_EDEBUG
unsigned i;
if (w &&
b->key.ptr[0] &&
btree_node_read_done(b))
if (w && b->key.ptr[0])
for (i = 0; i <= b->nsets; i++)
bch_check_key_order(b, b->sets[i].data);
#endif
@ -370,9 +368,8 @@ static inline bool should_split(struct btree *b)
> btree_blocks(b));
}
void bch_btree_read_done(struct closure *);
void bch_btree_read(struct btree *);
void bch_btree_write(struct btree *b, bool now, struct btree_op *op);
void bch_btree_node_read(struct btree *);
void bch_btree_node_write(struct btree *, struct closure *);
void bch_cannibalize_unlock(struct cache_set *, struct closure *);
void bch_btree_set_root(struct btree *);
@ -380,7 +377,6 @@ struct btree *bch_btree_node_alloc(struct cache_set *, int, struct closure *);
struct btree *bch_btree_node_get(struct cache_set *, struct bkey *,
int, struct btree_op *);
bool bch_btree_insert_keys(struct btree *, struct btree_op *);
bool bch_btree_insert_check_key(struct btree *, struct btree_op *,
struct bio *);
int bch_btree_insert(struct btree_op *, struct cache_set *);
@ -393,13 +389,14 @@ void bch_moving_gc(struct closure *);
int bch_btree_check(struct cache_set *, struct btree_op *);
uint8_t __bch_btree_mark_key(struct cache_set *, int, struct bkey *);
void bch_keybuf_init(struct keybuf *, keybuf_pred_fn *);
void bch_refill_keybuf(struct cache_set *, struct keybuf *, struct bkey *);
void bch_keybuf_init(struct keybuf *);
void bch_refill_keybuf(struct cache_set *, struct keybuf *, struct bkey *,
keybuf_pred_fn *);
bool bch_keybuf_check_overlapping(struct keybuf *, struct bkey *,
struct bkey *);
void bch_keybuf_del(struct keybuf *, struct keybuf_key *);
struct keybuf_key *bch_keybuf_next(struct keybuf *);
struct keybuf_key *bch_keybuf_next_rescan(struct cache_set *,
struct keybuf *, struct bkey *);
struct keybuf_key *bch_keybuf_next_rescan(struct cache_set *, struct keybuf *,
struct bkey *, keybuf_pred_fn *);
#endif

6
drivers/md/bcache/closure.c
View File

@ -66,16 +66,18 @@ static inline void closure_put_after_sub(struct closure *cl, int flags)
} else {
struct closure *parent = cl->parent;
struct closure_waitlist *wait = closure_waitlist(cl);
closure_fn *destructor = cl->fn;
closure_debug_destroy(cl);
smp_mb();
atomic_set(&cl->remaining, -1);
if (wait)
closure_wake_up(wait);
if (cl->fn)
cl->fn(cl);
if (destructor)
destructor(cl);
if (parent)
closure_put(parent);

178
drivers/md/bcache/debug.c
View File

@ -47,11 +47,10 @@ const char *bch_ptr_status(struct cache_set *c, const struct bkey *k)
return "";
}
struct keyprint_hack bch_pkey(const struct bkey *k)
int bch_bkey_to_text(char *buf, size_t size, const struct bkey *k)
{
unsigned i = 0;
struct keyprint_hack r;
char *out = r.s, *end = r.s + KEYHACK_SIZE;
char *out = buf, *end = buf + size;
#define p(...) (out += scnprintf(out, end - out, __VA_ARGS__))
@ -75,16 +74,14 @@ struct keyprint_hack bch_pkey(const struct bkey *k)
if (KEY_CSUM(k))
p(" cs%llu %llx", KEY_CSUM(k), k->ptr[1]);
#undef p
return r;
return out - buf;
}
struct keyprint_hack bch_pbtree(const struct btree *b)
int bch_btree_to_text(char *buf, size_t size, const struct btree *b)
{
struct keyprint_hack r;
snprintf(r.s, 40, "%zu level %i/%i", PTR_BUCKET_NR(b->c, &b->key, 0),
b->level, b->c->root ? b->c->root->level : -1);
return r;
return scnprintf(buf, size, "%zu level %i/%i",
PTR_BUCKET_NR(b->c, &b->key, 0),
b->level, b->c->root ? b->c->root->level : -1);
}
#if defined(CONFIG_BCACHE_DEBUG) || defined(CONFIG_BCACHE_EDEBUG)
@ -100,10 +97,12 @@ static void dump_bset(struct btree *b, struct bset *i)
{
struct bkey *k;
unsigned j;
char buf[80];
for (k = i->start; k < end(i); k = bkey_next(k)) {
bch_bkey_to_text(buf, sizeof(buf), k);
printk(KERN_ERR "block %zu key %zi/%u: %s", index(i, b),
(uint64_t *) k - i->d, i->keys, pkey(k));
(uint64_t *) k - i->d, i->keys, buf);
for (j = 0; j < KEY_PTRS(k); j++) {
size_t n = PTR_BUCKET_NR(b->c, k, j);
@ -144,7 +143,7 @@ void bch_btree_verify(struct btree *b, struct bset *new)
v->written = 0;
v->level = b->level;
bch_btree_read(v);
bch_btree_node_read(v);
closure_wait_event(&v->io.wait, &cl,
atomic_read(&b->io.cl.remaining) == -1);
@ -200,7 +199,7 @@ void bch_data_verify(struct search *s)
if (!check)
return;
if (bch_bio_alloc_pages(check, GFP_NOIO))
if (bio_alloc_pages(check, GFP_NOIO))
goto out_put;
check->bi_rw = READ_SYNC;
@ -252,6 +251,7 @@ static void vdump_bucket_and_panic(struct btree *b, const char *fmt,
va_list args)
{
unsigned i;
char buf[80];
console_lock();
@ -262,7 +262,8 @@ static void vdump_bucket_and_panic(struct btree *b, const char *fmt,
console_unlock();
panic("at %s\n", pbtree(b));
bch_btree_to_text(buf, sizeof(buf), b);
panic("at %s\n", buf);
}
void bch_check_key_order_msg(struct btree *b, struct bset *i,
@ -337,6 +338,7 @@ static ssize_t bch_dump_read(struct file *file, char __user *buf,
{
struct dump_iterator *i = file->private_data;
ssize_t ret = 0;
char kbuf[80];
while (size) {
struct keybuf_key *w;
@ -355,11 +357,12 @@ static ssize_t bch_dump_read(struct file *file, char __user *buf,
if (i->bytes)
break;
w = bch_keybuf_next_rescan(i->c, &i->keys, &MAX_KEY);
w = bch_keybuf_next_rescan(i->c, &i->keys, &MAX_KEY, dump_pred);
if (!w)
break;
i->bytes = snprintf(i->buf, PAGE_SIZE, "%s\n", pkey(&w->key));
bch_bkey_to_text(kbuf, sizeof(kbuf), &w->key);
i->bytes = snprintf(i->buf, PAGE_SIZE, "%s\n", kbuf);
bch_keybuf_del(&i->keys, w);
}
@ -377,7 +380,7 @@ static int bch_dump_open(struct inode *inode, struct file *file)
file->private_data = i;
i->c = c;
bch_keybuf_init(&i->keys, dump_pred);
bch_keybuf_init(&i->keys);
i->keys.last_scanned = KEY(0, 0, 0);
return 0;
@ -409,142 +412,6 @@ void bch_debug_init_cache_set(struct cache_set *c)
#endif
/* Fuzz tester has rotted: */
#if 0
static ssize_t btree_fuzz(struct kobject *k, struct kobj_attribute *a,
const char *buffer, size_t size)
{
void dump(struct btree *b)
{
struct bset *i;
for (i = b->sets[0].data;
index(i, b) < btree_blocks(b) &&
i->seq == b->sets[0].data->seq;
i = ((void *) i) + set_blocks(i, b->c) * block_bytes(b->c))
dump_bset(b, i);
}
struct cache_sb *sb;
struct cache_set *c;
struct btree *all[3], *b, *fill, *orig;
int j;
struct btree_op op;
bch_btree_op_init_stack(&op);
sb = kzalloc(sizeof(struct cache_sb), GFP_KERNEL);
if (!sb)
return -ENOMEM;
sb->bucket_size = 128;
sb->block_size = 4;
c = bch_cache_set_alloc(sb);
if (!c)
return -ENOMEM;
for (j = 0; j < 3; j++) {
BUG_ON(list_empty(&c->btree_cache));
all[j] = list_first_entry(&c->btree_cache, struct btree, list);
list_del_init(&all[j]->list);
all[j]->key = KEY(0, 0, c->sb.bucket_size);
bkey_copy_key(&all[j]->key, &MAX_KEY);
}
b = all[0];
fill = all[1];
orig = all[2];
while (1) {
for (j = 0; j < 3; j++)
all[j]->written = all[j]->nsets = 0;
bch_bset_init_next(b);
while (1) {
struct bset *i = write_block(b);
struct bkey *k = op.keys.top;
unsigned rand;
bkey_init(k);
rand = get_random_int();
op.type = rand & 1
? BTREE_INSERT
: BTREE_REPLACE;
rand >>= 1;
SET_KEY_SIZE(k, bucket_remainder(c, rand));
rand >>= c->bucket_bits;
rand &= 1024 * 512 - 1;
rand += c->sb.bucket_size;
SET_KEY_OFFSET(k, rand);
#if 0
SET_KEY_PTRS(k, 1);
#endif
bch_keylist_push(&op.keys);
bch_btree_insert_keys(b, &op);
if (should_split(b) ||
set_blocks(i, b->c) !=
__set_blocks(i, i->keys + 15, b->c)) {
i->csum = csum_set(i);
memcpy(write_block(fill),
i, set_bytes(i));
b->written += set_blocks(i, b->c);
fill->written = b->written;
if (b->written == btree_blocks(b))
break;
bch_btree_sort_lazy(b);
bch_bset_init_next(b);
}
}
memcpy(orig->sets[0].data,
fill->sets[0].data,
btree_bytes(c));
bch_btree_sort(b);
fill->written = 0;
bch_btree_read_done(&fill->io.cl);
if (b->sets[0].data->keys != fill->sets[0].data->keys ||
memcmp(b->sets[0].data->start,
fill->sets[0].data->start,
b->sets[0].data->keys * sizeof(uint64_t))) {
struct bset *i = b->sets[0].data;
struct bkey *k, *l;
for (k = i->start,
l = fill->sets[0].data->start;
k < end(i);
k = bkey_next(k), l = bkey_next(l))
if (bkey_cmp(k, l) ||
KEY_SIZE(k) != KEY_SIZE(l))
pr_err("key %zi differs: %s != %s",
(uint64_t *) k - i->d,
pkey(k), pkey(l));
for (j = 0; j < 3; j++) {
pr_err("**** Set %i ****", j);
dump(all[j]);
}
panic("\n");
}
pr_info("fuzz complete: %i keys", b->sets[0].data->keys);
}
}
kobj_attribute_write(fuzz, btree_fuzz);
#endif
void bch_debug_exit(void)
{
if (!IS_ERR_OR_NULL(debug))
@ -554,11 +421,6 @@ void bch_debug_exit(void)
int __init bch_debug_init(struct kobject *kobj)
{
int ret = 0;
#if 0
ret = sysfs_create_file(kobj, &ksysfs_fuzz.attr);
if (ret)
return ret;
#endif
debug = debugfs_create_dir("bcache", NULL);
return ret;

11
drivers/md/bcache/debug.h
View File

@ -3,15 +3,8 @@
/* Btree/bkey debug printing */
#define KEYHACK_SIZE 80
struct keyprint_hack {
char s[KEYHACK_SIZE];
};
struct keyprint_hack bch_pkey(const struct bkey *k);
struct keyprint_hack bch_pbtree(const struct btree *b);
#define pkey(k) (&bch_pkey(k).s[0])
#define pbtree(b) (&bch_pbtree(b).s[0])
int bch_bkey_to_text(char *buf, size_t size, const struct bkey *k);
int bch_btree_to_text(char *buf, size_t size, const struct btree *b);
#ifdef CONFIG_BCACHE_EDEBUG

68
drivers/md/bcache/io.c
View File

@ -9,6 +9,8 @@
#include "bset.h"
#include "debug.h"
#include <linux/blkdev.h>
static void bch_bi_idx_hack_endio(struct bio *bio, int error)
{
struct bio *p = bio->bi_private;
@ -66,13 +68,6 @@ static void bch_generic_make_request_hack(struct bio *bio)
* The newly allocated bio will point to @bio's bi_io_vec, if the split was on a
* bvec boundry; it is the caller's responsibility to ensure that @bio is not
* freed before the split.
*
* If bch_bio_split() is running under generic_make_request(), it's not safe to
* allocate more than one bio from the same bio set. Therefore, if it is running
* under generic_make_request() it masks out __GFP_WAIT when doing the
* allocation. The caller must check for failure if there's any possibility of
* it being called from under generic_make_request(); it is then the caller's
* responsibility to retry from a safe context (by e.g. punting to workqueue).
*/
struct bio *bch_bio_split(struct bio *bio, int sectors,
gfp_t gfp, struct bio_set *bs)
@ -83,20 +78,13 @@ struct bio *bch_bio_split(struct bio *bio, int sectors,
BUG_ON(sectors <= 0);
/*
* If we're being called from underneath generic_make_request() and we
* already allocated any bios from this bio set, we risk deadlock if we
* use the mempool. So instead, we possibly fail and let the caller punt
* to workqueue or somesuch and retry in a safe context.
*/
if (current->bio_list)
gfp &= ~__GFP_WAIT;
if (sectors >= bio_sectors(bio))
return bio;
if (bio->bi_rw & REQ_DISCARD) {
ret = bio_alloc_bioset(gfp, 1, bs);
if (!ret)
return NULL;
idx = 0;
goto out;
}
@ -160,17 +148,18 @@ static unsigned bch_bio_max_sectors(struct bio *bio)
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
unsigned max_segments = min_t(unsigned, BIO_MAX_PAGES,
queue_max_segments(q));
struct bio_vec *bv, *end = bio_iovec(bio) +
min_t(int, bio_segments(bio), max_segments);
if (bio->bi_rw & REQ_DISCARD)
return min(ret, q->limits.max_discard_sectors);
if (bio_segments(bio) > max_segments ||
q->merge_bvec_fn) {
struct bio_vec *bv;
int i, seg = 0;
ret = 0;
for (bv = bio_iovec(bio); bv < end; bv++) {
bio_for_each_segment(bv, bio, i) {
struct bvec_merge_data bvm = {
.bi_bdev = bio->bi_bdev,
.bi_sector = bio->bi_sector,
@ -178,10 +167,14 @@ static unsigned bch_bio_max_sectors(struct bio *bio)
.bi_rw = bio->bi_rw,
};
if (seg == max_segments)
break;
if (q->merge_bvec_fn &&
q->merge_bvec_fn(q, &bvm, bv) < (int) bv->bv_len)
break;
seg++;
ret += bv->bv_len >> 9;
}
}
@ -218,30 +211,10 @@ static void bch_bio_submit_split_endio(struct bio *bio, int error)
closure_put(cl);
}
static void __bch_bio_submit_split(struct closure *cl)
{
struct bio_split_hook *s = container_of(cl, struct bio_split_hook, cl);
struct bio *bio = s->bio, *n;
do {
n = bch_bio_split(bio, bch_bio_max_sectors(bio),
GFP_NOIO, s->p->bio_split);
if (!n)
continue_at(cl, __bch_bio_submit_split, system_wq);
n->bi_end_io = bch_bio_submit_split_endio;
n->bi_private = cl;
closure_get(cl);
bch_generic_make_request_hack(n);
} while (n != bio);
continue_at(cl, bch_bio_submit_split_done, NULL);
}
void bch_generic_make_request(struct bio *bio, struct bio_split_pool *p)
{
struct bio_split_hook *s;
struct bio *n;
if (!bio_has_data(bio) && !(bio->bi_rw & REQ_DISCARD))
goto submit;
@ -250,6 +223,7 @@ void bch_generic_make_request(struct bio *bio, struct bio_split_pool *p)
goto submit;
s = mempool_alloc(p->bio_split_hook, GFP_NOIO);
closure_init(&s->cl, NULL);
s->bio = bio;
s->p = p;
@ -257,8 +231,18 @@ void bch_generic_make_request(struct bio *bio, struct bio_split_pool *p)
s->bi_private = bio->bi_private;
bio_get(bio);
closure_call(&s->cl, __bch_bio_submit_split, NULL, NULL);
return;
do {
n = bch_bio_split(bio, bch_bio_max_sectors(bio),
GFP_NOIO, s->p->bio_split);
n->bi_end_io = bch_bio_submit_split_endio;
n->bi_private = &s->cl;
closure_get(&s->cl);
bch_generic_make_request_hack(n);
} while (n != bio);
continue_at(&s->cl, bch_bio_submit_split_done, NULL);
submit:
bch_generic_make_request_hack(bio);
}

27
drivers/md/bcache/journal.c
View File

@ -9,6 +9,8 @@
#include "debug.h"
#include "request.h"
#include <trace/events/bcache.h>
/*
* Journal replay/recovery:
*
@ -182,9 +184,14 @@ bsearch:
pr_debug("starting binary search, l %u r %u", l, r);
while (l + 1 < r) {
m = (l + r) >> 1;
seq = list_entry(list->prev, struct journal_replay,
list)->j.seq;
if (read_bucket(m))
m = (l + r) >> 1;
read_bucket(m);
if (seq != list_entry(list->prev, struct journal_replay,
list)->j.seq)
l = m;
else
r = m;
@ -300,7 +307,8 @@ int bch_journal_replay(struct cache_set *s, struct list_head *list,
for (k = i->j.start;
k < end(&i->j);
k = bkey_next(k)) {
pr_debug("%s", pkey(k));
trace_bcache_journal_replay_key(k);
bkey_copy(op->keys.top, k);
bch_keylist_push(&op->keys);
@ -384,7 +392,7 @@ out:
return;
found:
if (btree_node_dirty(best))
bch_btree_write(best, true, NULL);
bch_btree_node_write(best, NULL);
rw_unlock(true, best);
}
@ -617,7 +625,7 @@ static void journal_write_unlocked(struct closure *cl)
bio_reset(bio);
bio->bi_sector = PTR_OFFSET(k, i);
bio->bi_bdev = ca->bdev;
bio->bi_rw = REQ_WRITE|REQ_SYNC|REQ_META|REQ_FLUSH;
bio->bi_rw = REQ_WRITE|REQ_SYNC|REQ_META|REQ_FLUSH|REQ_FUA;
bio->bi_size = sectors << 9;
bio->bi_end_io = journal_write_endio;
@ -712,7 +720,8 @@ void bch_journal(struct closure *cl)
spin_lock(&c->journal.lock);
if (journal_full(&c->journal)) {
/* XXX: tracepoint */
trace_bcache_journal_full(c);
closure_wait(&c->journal.wait, cl);
journal_reclaim(c);
@ -728,13 +737,15 @@ void bch_journal(struct closure *cl)
if (b * c->sb.block_size > PAGE_SECTORS << JSET_BITS ||
b > c->journal.blocks_free) {
/* XXX: If we were inserting so many keys that they won't fit in
trace_bcache_journal_entry_full(c);
/*
* XXX: If we were inserting so many keys that they won't fit in
* an _empty_ journal write, we'll deadlock. For now, handle
* this in bch_keylist_realloc() - but something to think about.
*/
BUG_ON(!w->data->keys);
/* XXX: tracepoint */
BUG_ON(!closure_wait(&w->wait, cl));
closure_flush(&c->journal.io);

24
drivers/md/bcache/movinggc.c
View File

@ -9,6 +9,8 @@
#include "debug.h"
#include "request.h"
#include <trace/events/bcache.h>
struct moving_io {
struct keybuf_key *w;
struct search s;
@ -44,14 +46,14 @@ static void write_moving_finish(struct closure *cl)
{
struct moving_io *io = container_of(cl, struct moving_io, s.cl);
struct bio *bio = &io->bio.bio;
struct bio_vec *bv = bio_iovec_idx(bio, bio->bi_vcnt);
struct bio_vec *bv;
int i;
while (bv-- != bio->bi_io_vec)
bio_for_each_segment_all(bv, bio, i)
__free_page(bv->bv_page);
pr_debug("%s %s", io->s.op.insert_collision
? "collision moving" : "moved",
pkey(&io->w->key));
if (io->s.op.insert_collision)
trace_bcache_gc_copy_collision(&io->w->key);
bch_keybuf_del(&io->s.op.c->moving_gc_keys, io->w);
@ -94,8 +96,6 @@ static void write_moving(struct closure *cl)
struct moving_io *io = container_of(s, struct moving_io, s);
if (!s->error) {
trace_bcache_write_moving(&io->bio.bio);
moving_init(io);
io->bio.bio.bi_sector = KEY_START(&io->w->key);
@ -122,7 +122,6 @@ static void read_moving_submit(struct closure *cl)
struct moving_io *io = container_of(s, struct moving_io, s);
struct bio *bio = &io->bio.bio;
trace_bcache_read_moving(bio);
bch_submit_bbio(bio, s->op.c, &io->w->key, 0);
continue_at(cl, write_moving, bch_gc_wq);
@ -138,7 +137,8 @@ static void read_moving(struct closure *cl)
/* XXX: if we error, background writeback could stall indefinitely */
while (!test_bit(CACHE_SET_STOPPING, &c->flags)) {
w = bch_keybuf_next_rescan(c, &c->moving_gc_keys, &MAX_KEY);
w = bch_keybuf_next_rescan(c, &c->moving_gc_keys,
&MAX_KEY, moving_pred);
if (!w)
break;
@ -159,10 +159,10 @@ static void read_moving(struct closure *cl)
bio->bi_rw = READ;
bio->bi_end_io = read_moving_endio;
if (bch_bio_alloc_pages(bio, GFP_KERNEL))
if (bio_alloc_pages(bio, GFP_KERNEL))
goto err;
pr_debug("%s", pkey(&w->key));
trace_bcache_gc_copy(&w->key);
closure_call(&io->s.cl, read_moving_submit, NULL, &c->gc.cl);
@ -250,5 +250,5 @@ void bch_moving_gc(struct closure *cl)
void bch_moving_init_cache_set(struct cache_set *c)
{
bch_keybuf_init(&c->moving_gc_keys, moving_pred);
bch_keybuf_init(&c->moving_gc_keys);
}

197
drivers/md/bcache/request.c
View File

@ -10,6 +10,7 @@
#include "btree.h"
#include "debug.h"
#include "request.h"
#include "writeback.h"
#include <linux/cgroup.h>
#include <linux/module.h>
@ -21,8 +22,6 @@
#define CUTOFF_CACHE_ADD 95
#define CUTOFF_CACHE_READA 90
#define CUTOFF_WRITEBACK 50
#define CUTOFF_WRITEBACK_SYNC 75
struct kmem_cache *bch_search_cache;
@ -489,6 +488,12 @@ static void bch_insert_data_loop(struct closure *cl)
bch_queue_gc(op->c);
}
/*
* Journal writes are marked REQ_FLUSH; if the original write was a
* flush, it'll wait on the journal write.
*/
bio->bi_rw &= ~(REQ_FLUSH|REQ_FUA);
do {
unsigned i;
struct bkey *k;
@ -510,10 +515,6 @@ static void bch_insert_data_loop(struct closure *cl)
goto err;
n = bch_bio_split(bio, KEY_SIZE(k), GFP_NOIO, split);
if (!n) {
__bkey_put(op->c, k);
continue_at(cl, bch_insert_data_loop, bcache_wq);
}
n->bi_end_io = bch_insert_data_endio;
n->bi_private = cl;
@ -530,10 +531,9 @@ static void bch_insert_data_loop(struct closure *cl)
if (KEY_CSUM(k))
bio_csum(n, k);
pr_debug("%s", pkey(k));
trace_bcache_cache_insert(k);
bch_keylist_push(&op->keys);
trace_bcache_cache_insert(n, n->bi_sector, n->bi_bdev);
n->bi_rw |= REQ_WRITE;
bch_submit_bbio(n, op->c, k, 0);
} while (n != bio);
@ -716,7 +716,7 @@ static struct search *search_alloc(struct bio *bio, struct bcache_device *d)
s->task = current;
s->orig_bio = bio;
s->write = (bio->bi_rw & REQ_WRITE) != 0;
s->op.flush_journal = (bio->bi_rw & REQ_FLUSH) != 0;
s->op.flush_journal = (bio->bi_rw & (REQ_FLUSH|REQ_FUA)) != 0;
s->op.skip = (bio->bi_rw & REQ_DISCARD) != 0;
s->recoverable = 1;
s->start_time = jiffies;
@ -784,11 +784,8 @@ static void request_read_error(struct closure *cl)
int i;
if (s->recoverable) {
/* The cache read failed, but we can retry from the backing
* device.
*/
pr_debug("recovering at sector %llu",
(uint64_t) s->orig_bio->bi_sector);
/* Retry from the backing device: */
trace_bcache_read_retry(s->orig_bio);
s->error = 0;
bv = s->bio.bio.bi_io_vec;
@ -806,7 +803,6 @@ static void request_read_error(struct closure *cl)
/* XXX: invalidate cache */
trace_bcache_read_retry(&s->bio.bio);
closure_bio_submit(&s->bio.bio, &s->cl, s->d);
}
@ -827,53 +823,13 @@ static void request_read_done(struct closure *cl)
*/
if (s->op.cache_bio) {
struct bio_vec *src, *dst;
unsigned src_offset, dst_offset, bytes;
void *dst_ptr;
bio_reset(s->op.cache_bio);
s->op.cache_bio->bi_sector = s->cache_miss->bi_sector;
s->op.cache_bio->bi_bdev = s->cache_miss->bi_bdev;
s->op.cache_bio->bi_size = s->cache_bio_sectors << 9;
bch_bio_map(s->op.cache_bio, NULL);
src = bio_iovec(s->op.cache_bio);
dst = bio_iovec(s->cache_miss);
src_offset = src->bv_offset;
dst_offset = dst->bv_offset;
dst_ptr = kmap(dst->bv_page);
while (1) {
if (dst_offset == dst->bv_offset + dst->bv_len) {
kunmap(dst->bv_page);
dst++;
if (dst == bio_iovec_idx(s->cache_miss,
s->cache_miss->bi_vcnt))
break;
dst_offset = dst->bv_offset;
dst_ptr = kmap(dst->bv_page);
}
if (src_offset == src->bv_offset + src->bv_len) {
src++;
if (src == bio_iovec_idx(s->op.cache_bio,
s->op.cache_bio->bi_vcnt))
BUG();
src_offset = src->bv_offset;
}
bytes = min(dst->bv_offset + dst->bv_len - dst_offset,
src->bv_offset + src->bv_len - src_offset);
memcpy(dst_ptr + dst_offset,
page_address(src->bv_page) + src_offset,
bytes);
src_offset += bytes;
dst_offset += bytes;
}
bio_copy_data(s->cache_miss, s->op.cache_bio);
bio_put(s->cache_miss);
s->cache_miss = NULL;
@ -899,6 +855,7 @@ static void request_read_done_bh(struct closure *cl)
struct cached_dev *dc = container_of(s->d, struct cached_dev, disk);
bch_mark_cache_accounting(s, !s->cache_miss, s->op.skip);
trace_bcache_read(s->orig_bio, !s->cache_miss, s->op.skip);
if (s->error)
continue_at_nobarrier(cl, request_read_error, bcache_wq);
@ -917,9 +874,6 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
struct bio *miss;
miss = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
if (!miss)
return -EAGAIN;
if (miss == bio)
s->op.lookup_done = true;
@ -938,8 +892,9 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
reada = min(dc->readahead >> 9,
sectors - bio_sectors(miss));
if (bio_end(miss) + reada > bdev_sectors(miss->bi_bdev))
reada = bdev_sectors(miss->bi_bdev) - bio_end(miss);
if (bio_end_sector(miss) + reada > bdev_sectors(miss->bi_bdev))
reada = bdev_sectors(miss->bi_bdev) -
bio_end_sector(miss);
}
s->cache_bio_sectors = bio_sectors(miss) + reada;
@ -963,13 +918,12 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
goto out_put;
bch_bio_map(s->op.cache_bio, NULL);
if (bch_bio_alloc_pages(s->op.cache_bio, __GFP_NOWARN|GFP_NOIO))
if (bio_alloc_pages(s->op.cache_bio, __GFP_NOWARN|GFP_NOIO))
goto out_put;
s->cache_miss = miss;
bio_get(s->op.cache_bio);
trace_bcache_cache_miss(s->orig_bio);
closure_bio_submit(s->op.cache_bio, &s->cl, s->d);
return ret;
@ -1002,24 +956,13 @@ static void cached_dev_write_complete(struct closure *cl)
cached_dev_bio_complete(cl);
}
static bool should_writeback(struct cached_dev *dc, struct bio *bio)
{
unsigned threshold = (bio->bi_rw & REQ_SYNC)
? CUTOFF_WRITEBACK_SYNC
: CUTOFF_WRITEBACK;
return !atomic_read(&dc->disk.detaching) &&
cache_mode(dc, bio) == CACHE_MODE_WRITEBACK &&
dc->disk.c->gc_stats.in_use < threshold;
}
static void request_write(struct cached_dev *dc, struct search *s)
{
struct closure *cl = &s->cl;
struct bio *bio = &s->bio.bio;
struct bkey start, end;
start = KEY(dc->disk.id, bio->bi_sector, 0);
end = KEY(dc->disk.id, bio_end(bio), 0);
end = KEY(dc->disk.id, bio_end_sector(bio), 0);
bch_keybuf_check_overlapping(&s->op.c->moving_gc_keys, &start, &end);
@ -1034,22 +977,37 @@ static void request_write(struct cached_dev *dc, struct search *s)
if (bio->bi_rw & REQ_DISCARD)
goto skip;
if (should_writeback(dc, s->orig_bio,
cache_mode(dc, bio),
s->op.skip)) {
s->op.skip = false;
s->writeback = true;
}
if (s->op.skip)
goto skip;
if (should_writeback(dc, s->orig_bio))
s->writeback = true;
trace_bcache_write(s->orig_bio, s->writeback, s->op.skip);
if (!s->writeback) {
s->op.cache_bio = bio_clone_bioset(bio, GFP_NOIO,
dc->disk.bio_split);
trace_bcache_writethrough(s->orig_bio);
closure_bio_submit(bio, cl, s->d);
} else {
s->op.cache_bio = bio;
trace_bcache_writeback(s->orig_bio);
bch_writeback_add(dc, bio_sectors(bio));
bch_writeback_add(dc);
if (s->op.flush_journal) {
/* Also need to send a flush to the backing device */
s->op.cache_bio = bio_clone_bioset(bio, GFP_NOIO,
dc->disk.bio_split);
bio->bi_size = 0;
bio->bi_vcnt = 0;
closure_bio_submit(bio, cl, s->d);
} else {
s->op.cache_bio = bio;
}
}
out:
closure_call(&s->op.cl, bch_insert_data, NULL, cl);
@ -1058,7 +1016,6 @@ skip:
s->op.skip = true;
s->op.cache_bio = s->orig_bio;
bio_get(s->op.cache_bio);
trace_bcache_write_skip(s->orig_bio);
if ((bio->bi_rw & REQ_DISCARD) &&
!blk_queue_discard(bdev_get_queue(dc->bdev)))
@ -1088,9 +1045,10 @@ static void request_nodata(struct cached_dev *dc, struct search *s)
/* Cached devices - read & write stuff */
int bch_get_congested(struct cache_set *c)
unsigned bch_get_congested(struct cache_set *c)
{
int i;
long rand;
if (!c->congested_read_threshold_us &&
!c->congested_write_threshold_us)
@ -1106,7 +1064,13 @@ int bch_get_congested(struct cache_set *c)
i += CONGESTED_MAX;
return i <= 0 ? 1 : fract_exp_two(i, 6);
if (i > 0)
i = fract_exp_two(i, 6);
rand = get_random_int();
i -= bitmap_weight(&rand, BITS_PER_LONG);
return i > 0 ? i : 1;
}
static void add_sequential(struct task_struct *t)
@ -1126,10 +1090,8 @@ static void check_should_skip(struct cached_dev *dc, struct search *s)
{
struct cache_set *c = s->op.c;
struct bio *bio = &s->bio.bio;
long rand;
int cutoff = bch_get_congested(c);
unsigned mode = cache_mode(dc, bio);
unsigned sectors, congested = bch_get_congested(c);
if (atomic_read(&dc->disk.detaching) ||
c->gc_stats.in_use > CUTOFF_CACHE_ADD ||
@ -1147,17 +1109,14 @@ static void check_should_skip(struct cached_dev *dc, struct search *s)
goto skip;
}
if (!cutoff) {
cutoff = dc->sequential_cutoff >> 9;
if (!congested && !dc->sequential_cutoff)
goto rescale;
if (!cutoff)
goto rescale;
if (mode == CACHE_MODE_WRITEBACK &&
(bio->bi_rw & REQ_WRITE) &&
(bio->bi_rw & REQ_SYNC))
goto rescale;
}
if (!congested &&
mode == CACHE_MODE_WRITEBACK &&
(bio->bi_rw & REQ_WRITE) &&
(bio->bi_rw & REQ_SYNC))
goto rescale;
if (dc->sequential_merge) {
struct io *i;
@ -1177,7 +1136,7 @@ found:
if (i->sequential + bio->bi_size > i->sequential)
i->sequential += bio->bi_size;
i->last = bio_end(bio);
i->last = bio_end_sector(bio);
i->jiffies = jiffies + msecs_to_jiffies(5000);
s->task->sequential_io = i->sequential;
@ -1192,12 +1151,19 @@ found:
add_sequential(s->task);
}
rand = get_random_int();
cutoff -= bitmap_weight(&rand, BITS_PER_LONG);
sectors = max(s->task->sequential_io,
s->task->sequential_io_avg) >> 9;
if (cutoff <= (int) (max(s->task->sequential_io,
s->task->sequential_io_avg) >> 9))
if (dc->sequential_cutoff &&
sectors >= dc->sequential_cutoff >> 9) {
trace_bcache_bypass_sequential(s->orig_bio);
goto skip;
}
if (congested && sectors >= congested) {
trace_bcache_bypass_congested(s->orig_bio);
goto skip;
}
rescale:
bch_rescale_priorities(c, bio_sectors(bio));
@ -1288,30 +1254,25 @@ void bch_cached_dev_request_init(struct cached_dev *dc)
static int flash_dev_cache_miss(struct btree *b, struct search *s,
struct bio *bio, unsigned sectors)
{
struct bio_vec *bv;
int i;
/* Zero fill bio */
while (bio->bi_idx != bio->bi_vcnt) {
struct bio_vec *bv = bio_iovec(bio);
bio_for_each_segment(bv, bio, i) {
unsigned j = min(bv->bv_len >> 9, sectors);
void *p = kmap(bv->bv_page);
memset(p + bv->bv_offset, 0, j << 9);
kunmap(bv->bv_page);
bv->bv_len -= j << 9;
bv->bv_offset += j << 9;
if (bv->bv_len)
return 0;
bio->bi_sector += j;
bio->bi_size -= j << 9;
bio->bi_idx++;
sectors -= j;
sectors -= j;
}
s->op.lookup_done = true;
bio_advance(bio, min(sectors << 9, bio->bi_size));
if (!bio->bi_size)
s->op.lookup_done = true;
return 0;
}
@ -1338,8 +1299,8 @@ static void flash_dev_make_request(struct request_queue *q, struct bio *bio)
closure_call(&s->op.cl, btree_read_async, NULL, cl);
} else if (bio_has_data(bio) || s->op.skip) {
bch_keybuf_check_overlapping(&s->op.c->moving_gc_keys,
&KEY(d->id, bio->bi_sector, 0),
&KEY(d->id, bio_end(bio), 0));
&KEY(d->id, bio->bi_sector, 0),
&KEY(d->id, bio_end_sector(bio), 0));
s->writeback = true;
s->op.cache_bio = bio;

2
drivers/md/bcache/request.h
View File

@ -30,7 +30,7 @@ struct search {
};
void bch_cache_read_endio(struct bio *, int);
int bch_get_congested(struct cache_set *);
unsigned bch_get_congested(struct cache_set *);
void bch_insert_data(struct closure *cl);
void bch_btree_insert_async(struct closure *);
void bch_cache_read_endio(struct bio *, int);

171
drivers/md/bcache/super.c
View File

@ -10,10 +10,13 @@
#include "btree.h"
#include "debug.h"
#include "request.h"
#include "writeback.h"
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/debugfs.h>
#include <linux/genhd.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/reboot.h>
@ -342,6 +345,7 @@ static void uuid_io(struct cache_set *c, unsigned long rw,
struct closure *cl = &c->uuid_write.cl;
struct uuid_entry *u;
unsigned i;
char buf[80];
BUG_ON(!parent);
closure_lock(&c->uuid_write, parent);
@ -362,8 +366,8 @@ static void uuid_io(struct cache_set *c, unsigned long rw,
break;
}
pr_debug("%s UUIDs at %s", rw & REQ_WRITE ? "wrote" : "read",
pkey(&c->uuid_bucket));
bch_bkey_to_text(buf, sizeof(buf), k);
pr_debug("%s UUIDs at %s", rw & REQ_WRITE ? "wrote" : "read", buf);
for (u = c->uuids; u < c->uuids + c->nr_uuids; u++)
if (!bch_is_zero(u->uuid, 16))
@ -543,7 +547,6 @@ void bch_prio_write(struct cache *ca)
pr_debug("free %zu, free_inc %zu, unused %zu", fifo_used(&ca->free),
fifo_used(&ca->free_inc), fifo_used(&ca->unused));
blktrace_msg(ca, "Starting priorities: " buckets_free(ca));
for (i = prio_buckets(ca) - 1; i >= 0; --i) {
long bucket;
@ -704,7 +707,8 @@ static void bcache_device_detach(struct bcache_device *d)
atomic_set(&d->detaching, 0);
}
bcache_device_unlink(d);
if (!d->flush_done)
bcache_device_unlink(d);
d->c->devices[d->id] = NULL;
closure_put(&d->c->caching);
@ -743,13 +747,35 @@ static void bcache_device_free(struct bcache_device *d)
mempool_destroy(d->unaligned_bvec);
if (d->bio_split)
bioset_free(d->bio_split);
if (is_vmalloc_addr(d->stripe_sectors_dirty))
vfree(d->stripe_sectors_dirty);
else
kfree(d->stripe_sectors_dirty);
closure_debug_destroy(&d->cl);
}
static int bcache_device_init(struct bcache_device *d, unsigned block_size)
static int bcache_device_init(struct bcache_device *d, unsigned block_size,
sector_t sectors)
{
struct request_queue *q;
size_t n;
if (!d->stripe_size_bits)
d->stripe_size_bits = 31;
d->nr_stripes = round_up(sectors, 1 << d->stripe_size_bits) >>
d->stripe_size_bits;
if (!d->nr_stripes || d->nr_stripes > SIZE_MAX / sizeof(atomic_t))
return -ENOMEM;
n = d->nr_stripes * sizeof(atomic_t);
d->stripe_sectors_dirty = n < PAGE_SIZE << 6
? kzalloc(n, GFP_KERNEL)
: vzalloc(n);
if (!d->stripe_sectors_dirty)
return -ENOMEM;
if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
!(d->unaligned_bvec = mempool_create_kmalloc_pool(1,
@ -759,6 +785,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size)
!(q = blk_alloc_queue(GFP_KERNEL)))
return -ENOMEM;
set_capacity(d->disk, sectors);
snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", bcache_minor);
d->disk->major = bcache_major;
@ -781,6 +808,8 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size)
set_bit(QUEUE_FLAG_NONROT, &d->disk->queue->queue_flags);
set_bit(QUEUE_FLAG_DISCARD, &d->disk->queue->queue_flags);
blk_queue_flush(q, REQ_FLUSH|REQ_FUA);
return 0;
}
@ -800,6 +829,17 @@ static void calc_cached_dev_sectors(struct cache_set *c)
void bch_cached_dev_run(struct cached_dev *dc)
{
struct bcache_device *d = &dc->disk;
char buf[SB_LABEL_SIZE + 1];
char *env[] = {
"DRIVER=bcache",
kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
NULL,
NULL,
};
memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
buf[SB_LABEL_SIZE] = '\0';
env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf);
if (atomic_xchg(&dc->running, 1))
return;
@ -816,10 +856,12 @@ void bch_cached_dev_run(struct cached_dev *dc)
add_disk(d->disk);
bd_link_disk_holder(dc->bdev, dc->disk.disk);
#if 0
char *env[] = { "SYMLINK=label" , NULL };
/* won't show up in the uevent file, use udevadm monitor -e instead
* only class / kset properties are persistent */
kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
#endif
kfree(env[1]);
kfree(env[2]);
if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") ||
sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache"))
pr_debug("error creating sysfs link");
@ -960,6 +1002,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c)
atomic_set(&dc->count, 1);
if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) {
bch_sectors_dirty_init(dc);
atomic_set(&dc->has_dirty, 1);
atomic_inc(&dc->count);
bch_writeback_queue(dc);
@ -1014,6 +1057,14 @@ static void cached_dev_flush(struct closure *cl)
struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl);
struct bcache_device *d = &dc->disk;
mutex_lock(&bch_register_lock);
d->flush_done = 1;
if (d->c)
bcache_device_unlink(d);
mutex_unlock(&bch_register_lock);
bch_cache_accounting_destroy(&dc->accounting);
kobject_del(&d->kobj);
@ -1045,7 +1096,8 @@ static int cached_dev_init(struct cached_dev *dc, unsigned block_size)
hlist_add_head(&io->hash, dc->io_hash + RECENT_IO);
}
ret = bcache_device_init(&dc->disk, block_size);
ret = bcache_device_init(&dc->disk, block_size,
dc->bdev->bd_part->nr_sects - dc->sb.data_offset);
if (ret)
return ret;
@ -1144,11 +1196,10 @@ static int flash_dev_run(struct cache_set *c, struct uuid_entry *u)
kobject_init(&d->kobj, &bch_flash_dev_ktype);
if (bcache_device_init(d, block_bytes(c)))
if (bcache_device_init(d, block_bytes(c), u->sectors))
goto err;
bcache_device_attach(d, c, u - c->uuids);
set_capacity(d->disk, u->sectors);
bch_flash_dev_request_init(d);
add_disk(d->disk);
@ -1255,9 +1306,10 @@ static void cache_set_free(struct closure *cl)
free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c)));
free_pages((unsigned long) c->sort, ilog2(bucket_pages(c)));
kfree(c->fill_iter);
if (c->bio_split)
bioset_free(c->bio_split);
if (c->fill_iter)
mempool_destroy(c->fill_iter);
if (c->bio_meta)
mempool_destroy(c->bio_meta);
if (c->search)
@ -1278,11 +1330,9 @@ static void cache_set_free(struct closure *cl)
static void cache_set_flush(struct closure *cl)
{
struct cache_set *c = container_of(cl, struct cache_set, caching);
struct cache *ca;
struct btree *b;
/* Shut down allocator threads */
set_bit(CACHE_SET_STOPPING_2, &c->flags);
wake_up(&c->alloc_wait);
unsigned i;
bch_cache_accounting_destroy(&c->accounting);
@ -1295,7 +1345,11 @@ static void cache_set_flush(struct closure *cl)
/* Should skip this if we're unregistering because of an error */
list_for_each_entry(b, &c->btree_cache, list)
if (btree_node_dirty(b))
bch_btree_write(b, true, NULL);
bch_btree_node_write(b, NULL);
for_each_cache(ca, c, i)
if (ca->alloc_thread)
kthread_stop(ca->alloc_thread);
closure_return(cl);
}
@ -1303,18 +1357,22 @@ static void cache_set_flush(struct closure *cl)
static void __cache_set_unregister(struct closure *cl)
{
struct cache_set *c = container_of(cl, struct cache_set, caching);
struct cached_dev *dc, *t;
struct cached_dev *dc;
size_t i;
mutex_lock(&bch_register_lock);
if (test_bit(CACHE_SET_UNREGISTERING, &c->flags))
list_for_each_entry_safe(dc, t, &c->cached_devs, list)
bch_cached_dev_detach(dc);
for (i = 0; i < c->nr_uuids; i++)
if (c->devices[i] && UUID_FLASH_ONLY(&c->uuids[i]))
bcache_device_stop(c->devices[i]);
if (c->devices[i]) {
if (!UUID_FLASH_ONLY(&c->uuids[i]) &&
test_bit(CACHE_SET_UNREGISTERING, &c->flags)) {
dc = container_of(c->devices[i],
struct cached_dev, disk);
bch_cached_dev_detach(dc);
} else {
bcache_device_stop(c->devices[i]);
}
}
mutex_unlock(&bch_register_lock);
@ -1373,9 +1431,9 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
c->btree_pages = max_t(int, c->btree_pages / 4,
BTREE_MAX_PAGES);
init_waitqueue_head(&c->alloc_wait);
c->sort_crit_factor = int_sqrt(c->btree_pages);
mutex_init(&c->bucket_lock);
mutex_init(&c->fill_lock);
mutex_init(&c->sort_lock);
spin_lock_init(&c->sort_time_lock);
closure_init_unlocked(&c->sb_write);
@ -1401,8 +1459,8 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
!(c->bio_meta = mempool_create_kmalloc_pool(2,
sizeof(struct bbio) + sizeof(struct bio_vec) *
bucket_pages(c))) ||
!(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) ||
!(c->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
!(c->fill_iter = kmalloc(iter_size, GFP_KERNEL)) ||
!(c->sort = alloc_bucket_pages(GFP_KERNEL, c)) ||
!(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) ||
bch_journal_alloc(c) ||
@ -1410,8 +1468,6 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
bch_open_buckets_alloc(c))
goto err;
c->fill_iter->size = sb->bucket_size / sb->block_size;
c->congested_read_threshold_us = 2000;
c->congested_write_threshold_us = 20000;
c->error_limit = 8 << IO_ERROR_SHIFT;
@ -1496,9 +1552,10 @@ static void run_cache_set(struct cache_set *c)
*/
bch_journal_next(&c->journal);
err = "error starting allocator thread";
for_each_cache(ca, c, i)
closure_call(&ca->alloc, bch_allocator_thread,
system_wq, &c->cl);
if (bch_cache_allocator_start(ca))
goto err;
/*
* First place it's safe to allocate: btree_check() and
@ -1531,17 +1588,16 @@ static void run_cache_set(struct cache_set *c)
bch_btree_gc_finish(c);
err = "error starting allocator thread";
for_each_cache(ca, c, i)
closure_call(&ca->alloc, bch_allocator_thread,
ca->alloc_workqueue, &c->cl);
if (bch_cache_allocator_start(ca))
goto err;
mutex_lock(&c->bucket_lock);
for_each_cache(ca, c, i)
bch_prio_write(ca);
mutex_unlock(&c->bucket_lock);
wake_up(&c->alloc_wait);
err = "cannot allocate new UUID bucket";
if (__uuid_write(c))
goto err_unlock_gc;
@ -1552,7 +1608,7 @@ static void run_cache_set(struct cache_set *c)
goto err_unlock_gc;
bkey_copy_key(&c->root->key, &MAX_KEY);
bch_btree_write(c->root, true, &op);
bch_btree_node_write(c->root, &op.cl);
bch_btree_set_root(c->root);
rw_unlock(true, c->root);
@ -1673,9 +1729,6 @@ void bch_cache_release(struct kobject *kobj)
bio_split_pool_free(&ca->bio_split_hook);
if (ca->alloc_workqueue)
destroy_workqueue(ca->alloc_workqueue);
free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca)));
kfree(ca->prio_buckets);
vfree(ca->buckets);
@ -1723,7 +1776,6 @@ static int cache_alloc(struct cache_sb *sb, struct cache *ca)
!(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) *
2, GFP_KERNEL)) ||
!(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)) ||
!(ca->alloc_workqueue = alloc_workqueue("bch_allocator", 0, 1)) ||
bio_split_pool_init(&ca->bio_split_hook))
return -ENOMEM;
@ -1786,6 +1838,36 @@ static ssize_t register_bcache(struct kobject *, struct kobj_attribute *,
kobj_attribute_write(register, register_bcache);
kobj_attribute_write(register_quiet, register_bcache);
static bool bch_is_open_backing(struct block_device *bdev) {
struct cache_set *c, *tc;
struct cached_dev *dc, *t;
list_for_each_entry_safe(c, tc, &bch_cache_sets, list)
list_for_each_entry_safe(dc, t, &c->cached_devs, list)
if (dc->bdev == bdev)
return true;
list_for_each_entry_safe(dc, t, &uncached_devices, list)
if (dc->bdev == bdev)
return true;
return false;
}
static bool bch_is_open_cache(struct block_device *bdev) {
struct cache_set *c, *tc;
struct cache *ca;
unsigned i;
list_for_each_entry_safe(c, tc, &bch_cache_sets, list)
for_each_cache(ca, c, i)
if (ca->bdev == bdev)
return true;
return false;
}
static bool bch_is_open(struct block_device *bdev) {
return bch_is_open_cache(bdev) || bch_is_open_backing(bdev);
}
static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
const char *buffer, size_t size)
{
@ -1810,8 +1892,13 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
FMODE_READ|FMODE_WRITE|FMODE_EXCL,
sb);
if (IS_ERR(bdev)) {
if (bdev == ERR_PTR(-EBUSY))
err = "device busy";
if (bdev == ERR_PTR(-EBUSY)) {
bdev = lookup_bdev(strim(path));
if (!IS_ERR(bdev) && bch_is_open(bdev))
err = "device already registered";
else
err = "device busy";
}
goto err;
}

64
drivers/md/bcache/sysfs.c
View File

@ -9,7 +9,9 @@
#include "sysfs.h"
#include "btree.h"
#include "request.h"
#include "writeback.h"
#include <linux/blkdev.h>
#include <linux/sort.h>
static const char * const cache_replacement_policies[] = {
@ -79,6 +81,9 @@ rw_attribute(writeback_rate_p_term_inverse);
rw_attribute(writeback_rate_d_smooth);
read_attribute(writeback_rate_debug);
read_attribute(stripe_size);
read_attribute(partial_stripes_expensive);
rw_attribute(synchronous);
rw_attribute(journal_delay_ms);
rw_attribute(discard);
@ -127,7 +132,7 @@ SHOW(__bch_cached_dev)
char derivative[20];
char target[20];
bch_hprint(dirty,
atomic_long_read(&dc->disk.sectors_dirty) << 9);
bcache_dev_sectors_dirty(&dc->disk) << 9);
bch_hprint(derivative, dc->writeback_rate_derivative << 9);
bch_hprint(target, dc->writeback_rate_target << 9);
@ -143,7 +148,10 @@ SHOW(__bch_cached_dev)
}
sysfs_hprint(dirty_data,
atomic_long_read(&dc->disk.sectors_dirty) << 9);
bcache_dev_sectors_dirty(&dc->disk) << 9);
sysfs_hprint(stripe_size, (1 << dc->disk.stripe_size_bits) << 9);
var_printf(partial_stripes_expensive, "%u");
var_printf(sequential_merge, "%i");
var_hprint(sequential_cutoff);
@ -170,6 +178,7 @@ STORE(__cached_dev)
disk.kobj);
unsigned v = size;
struct cache_set *c;
struct kobj_uevent_env *env;
#define d_strtoul(var) sysfs_strtoul(var, dc->var)
#define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
@ -214,6 +223,7 @@ STORE(__cached_dev)
}
if (attr == &sysfs_label) {
/* note: endlines are preserved */
memcpy(dc->sb.label, buf, SB_LABEL_SIZE);
bch_write_bdev_super(dc, NULL);
if (dc->disk.c) {
@ -221,6 +231,15 @@ STORE(__cached_dev)
buf, SB_LABEL_SIZE);
bch_uuid_write(dc->disk.c);
}
env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
if (!env)
return -ENOMEM;
add_uevent_var(env, "DRIVER=bcache");
add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
add_uevent_var(env, "CACHED_LABEL=%s", buf);
kobject_uevent_env(
&disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp);
kfree(env);
}
if (attr == &sysfs_attach) {
@ -284,6 +303,8 @@ static struct attribute *bch_cached_dev_files[] = {
&sysfs_writeback_rate_d_smooth,
&sysfs_writeback_rate_debug,
&sysfs_dirty_data,
&sysfs_stripe_size,
&sysfs_partial_stripes_expensive,
&sysfs_sequential_cutoff,
&sysfs_sequential_merge,
&sysfs_clear_stats,
@ -665,12 +686,10 @@ SHOW(__bch_cache)
int cmp(const void *l, const void *r)
{ return *((uint16_t *) r) - *((uint16_t *) l); }
/* Number of quantiles we compute */
const unsigned nq = 31;
size_t n = ca->sb.nbuckets, i, unused, btree;
uint64_t sum = 0;
uint16_t q[nq], *p, *cached;
/* Compute 31 quantiles */
uint16_t q[31], *p, *cached;
ssize_t ret;
cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t));
@ -703,26 +722,29 @@ SHOW(__bch_cache)
if (n)
do_div(sum, n);
for (i = 0; i < nq; i++)
q[i] = INITIAL_PRIO - cached[n * (i + 1) / (nq + 1)];
for (i = 0; i < ARRAY_SIZE(q); i++)
q[i] = INITIAL_PRIO - cached[n * (i + 1) /
(ARRAY_SIZE(q) + 1)];
vfree(p);
ret = snprintf(buf, PAGE_SIZE,
"Unused: %zu%%\n"
"Metadata: %zu%%\n"
"Average: %llu\n"
"Sectors per Q: %zu\n"
"Quantiles: [",
unused * 100 / (size_t) ca->sb.nbuckets,
btree * 100 / (size_t) ca->sb.nbuckets, sum,
n * ca->sb.bucket_size / (nq + 1));
ret = scnprintf(buf, PAGE_SIZE,
"Unused: %zu%%\n"
"Metadata: %zu%%\n"
"Average: %llu\n"
"Sectors per Q: %zu\n"
"Quantiles: [",
unused * 100 / (size_t) ca->sb.nbuckets,
btree * 100 / (size_t) ca->sb.nbuckets, sum,
n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
for (i = 0; i < nq && ret < (ssize_t) PAGE_SIZE; i++)
ret += snprintf(buf + ret, PAGE_SIZE - ret,
i < nq - 1 ? "%u " : "%u]\n", q[i]);
for (i = 0; i < ARRAY_SIZE(q); i++)
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"%u ", q[i]);
ret--;
ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
buf[PAGE_SIZE - 1] = '\0';
return ret;
}

47
drivers/md/bcache/trace.c
View File

@ -2,6 +2,7 @@
#include "btree.h"
#include "request.h"
#include <linux/blktrace_api.h>
#include <linux/module.h>
#define CREATE_TRACE_POINTS
@ -9,18 +10,44 @@
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_request_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_request_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_passthrough);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_cache_hit);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_cache_miss);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_bypass_sequential);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_bypass_congested);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_read);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_write);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_read_retry);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_writethrough);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_writeback);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_write_skip);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_cache_insert);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_journal_replay_key);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_journal_write);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_journal_full);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_journal_entry_full);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_cache_cannibalize);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_read);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_write);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_write_dirty);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_read_dirty);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_journal_write);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_cache_insert);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_node_alloc);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_node_alloc_fail);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_node_free);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_gc_coalesce);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_gc_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_gc_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_gc_copy);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_gc_copy_collision);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_insert_key);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_node_split);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_node_compact);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_btree_set_root);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_alloc_invalidate);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_alloc_fail);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_writeback);
EXPORT_TRACEPOINT_SYMBOL_GPL(bcache_writeback_collision);

17
drivers/md/bcache/util.c
View File

@ -228,23 +228,6 @@ start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset,
}
}
int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp)
{
int i;
struct bio_vec *bv;
bio_for_each_segment(bv, bio, i) {
bv->bv_page = alloc_page(gfp);
if (!bv->bv_page) {
while (bv-- != bio->bi_io_vec + bio->bi_idx)
__free_page(bv->bv_page);
return -ENOMEM;
}
}
return 0;
}
/*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any
* use permitted, subject to terms of PostgreSQL license; see.)

6
drivers/md/bcache/util.h
View File

@ -15,8 +15,6 @@
struct closure;
#include <trace/events/bcache.h>
#ifdef CONFIG_BCACHE_EDEBUG
#define atomic_dec_bug(v) BUG_ON(atomic_dec_return(v) < 0)
@ -566,12 +564,8 @@ static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
return x;
}
#define bio_end(bio) ((bio)->bi_sector + bio_sectors(bio))
void bch_bio_map(struct bio *bio, void *base);
int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp);
static inline sector_t bdev_sectors(struct block_device *bdev)
{
return bdev->bd_inode->i_size >> 9;

133
drivers/md/bcache/writeback.c
View File

@ -9,6 +9,9 @@
#include "bcache.h"
#include "btree.h"
#include "debug.h"
#include "writeback.h"
#include <trace/events/bcache.h>
static struct workqueue_struct *dirty_wq;
@ -36,7 +39,7 @@ static void __update_writeback_rate(struct cached_dev *dc)
int change = 0;
int64_t error;
int64_t dirty = atomic_long_read(&dc->disk.sectors_dirty);
int64_t dirty = bcache_dev_sectors_dirty(&dc->disk);
int64_t derivative = dirty - dc->disk.sectors_dirty_last;
dc->disk.sectors_dirty_last = dirty;
@ -105,6 +108,31 @@ static bool dirty_pred(struct keybuf *buf, struct bkey *k)
return KEY_DIRTY(k);
}
static bool dirty_full_stripe_pred(struct keybuf *buf, struct bkey *k)
{
uint64_t stripe;
unsigned nr_sectors = KEY_SIZE(k);
struct cached_dev *dc = container_of(buf, struct cached_dev,
writeback_keys);
unsigned stripe_size = 1 << dc->disk.stripe_size_bits;
if (!KEY_DIRTY(k))
return false;
stripe = KEY_START(k) >> dc->disk.stripe_size_bits;
while (1) {
if (atomic_read(dc->disk.stripe_sectors_dirty + stripe) !=
stripe_size)
return false;
if (nr_sectors <= stripe_size)
return true;
nr_sectors -= stripe_size;
stripe++;
}
}
static void dirty_init(struct keybuf_key *w)
{
struct dirty_io *io = w->private;
@ -149,7 +177,22 @@ static void refill_dirty(struct closure *cl)
searched_from_start = true;
}
bch_refill_keybuf(dc->disk.c, buf, &end);
if (dc->partial_stripes_expensive) {
uint64_t i;
for (i = 0; i < dc->disk.nr_stripes; i++)
if (atomic_read(dc->disk.stripe_sectors_dirty + i) ==
1 << dc->disk.stripe_size_bits)
goto full_stripes;
goto normal_refill;
full_stripes:
bch_refill_keybuf(dc->disk.c, buf, &end,
dirty_full_stripe_pred);
} else {
normal_refill:
bch_refill_keybuf(dc->disk.c, buf, &end, dirty_pred);
}
if (bkey_cmp(&buf->last_scanned, &end) >= 0 && searched_from_start) {
/* Searched the entire btree - delay awhile */
@ -181,10 +224,8 @@ void bch_writeback_queue(struct cached_dev *dc)
}
}
void bch_writeback_add(struct cached_dev *dc, unsigned sectors)
void bch_writeback_add(struct cached_dev *dc)
{
atomic_long_add(sectors, &dc->disk.sectors_dirty);
if (!atomic_read(&dc->has_dirty) &&
!atomic_xchg(&dc->has_dirty, 1)) {
atomic_inc(&dc->count);
@ -203,6 +244,34 @@ void bch_writeback_add(struct cached_dev *dc, unsigned sectors)
}
}
void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
uint64_t offset, int nr_sectors)
{
struct bcache_device *d = c->devices[inode];
unsigned stripe_size, stripe_offset;
uint64_t stripe;
if (!d)
return;
stripe_size = 1 << d->stripe_size_bits;
stripe = offset >> d->stripe_size_bits;
stripe_offset = offset & (stripe_size - 1);
while (nr_sectors) {
int s = min_t(unsigned, abs(nr_sectors),
stripe_size - stripe_offset);
if (nr_sectors < 0)
s = -s;
atomic_add(s, d->stripe_sectors_dirty + stripe);
nr_sectors -= s;
stripe_offset = 0;
stripe++;
}
}
/* Background writeback - IO loop */
static void dirty_io_destructor(struct closure *cl)
@ -216,9 +285,10 @@ static void write_dirty_finish(struct closure *cl)
struct dirty_io *io = container_of(cl, struct dirty_io, cl);
struct keybuf_key *w = io->bio.bi_private;
struct cached_dev *dc = io->dc;
struct bio_vec *bv = bio_iovec_idx(&io->bio, io->bio.bi_vcnt);
struct bio_vec *bv;
int i;
while (bv-- != io->bio.bi_io_vec)
bio_for_each_segment_all(bv, &io->bio, i)
__free_page(bv->bv_page);
/* This is kind of a dumb way of signalling errors. */
@ -236,10 +306,12 @@ static void write_dirty_finish(struct closure *cl)
for (i = 0; i < KEY_PTRS(&w->key); i++)
atomic_inc(&PTR_BUCKET(dc->disk.c, &w->key, i)->pin);
pr_debug("clearing %s", pkey(&w->key));
bch_btree_insert(&op, dc->disk.c);
closure_sync(&op.cl);
if (op.insert_collision)
trace_bcache_writeback_collision(&w->key);
atomic_long_inc(op.insert_collision
? &dc->disk.c->writeback_keys_failed
: &dc->disk.c->writeback_keys_done);
@ -275,7 +347,6 @@ static void write_dirty(struct closure *cl)
io->bio.bi_bdev = io->dc->bdev;
io->bio.bi_end_io = dirty_endio;
trace_bcache_write_dirty(&io->bio);
closure_bio_submit(&io->bio, cl, &io->dc->disk);
continue_at(cl, write_dirty_finish, dirty_wq);
@ -296,7 +367,6 @@ static void read_dirty_submit(struct closure *cl)
{
struct dirty_io *io = container_of(cl, struct dirty_io, cl);
trace_bcache_read_dirty(&io->bio);
closure_bio_submit(&io->bio, cl, &io->dc->disk);
continue_at(cl, write_dirty, dirty_wq);
@ -349,10 +419,10 @@ static void read_dirty(struct closure *cl)
io->bio.bi_rw = READ;
io->bio.bi_end_io = read_dirty_endio;
if (bch_bio_alloc_pages(&io->bio, GFP_KERNEL))
if (bio_alloc_pages(&io->bio, GFP_KERNEL))
goto err_free;
pr_debug("%s", pkey(&w->key));
trace_bcache_writeback(&w->key);
closure_call(&io->cl, read_dirty_submit, NULL, &dc->disk.cl);
@ -375,12 +445,49 @@ err:
refill_dirty(cl);
}
/* Init */
static int bch_btree_sectors_dirty_init(struct btree *b, struct btree_op *op,
struct cached_dev *dc)
{
struct bkey *k;
struct btree_iter iter;
bch_btree_iter_init(b, &iter, &KEY(dc->disk.id, 0, 0));
while ((k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad)))
if (!b->level) {
if (KEY_INODE(k) > dc->disk.id)
break;
if (KEY_DIRTY(k))
bcache_dev_sectors_dirty_add(b->c, dc->disk.id,
KEY_START(k),
KEY_SIZE(k));
} else {
btree(sectors_dirty_init, k, b, op, dc);
if (KEY_INODE(k) > dc->disk.id)
break;
cond_resched();
}
return 0;
}
void bch_sectors_dirty_init(struct cached_dev *dc)
{
struct btree_op op;
bch_btree_op_init_stack(&op);
btree_root(sectors_dirty_init, dc->disk.c, &op, dc);
}
void bch_cached_dev_writeback_init(struct cached_dev *dc)
{
closure_init_unlocked(&dc->writeback);
init_rwsem(&dc->writeback_lock);
bch_keybuf_init(&dc->writeback_keys, dirty_pred);
bch_keybuf_init(&dc->writeback_keys);
dc->writeback_metadata = true;
dc->writeback_running = true;

64
drivers/md/bcache/writeback.h Normal file
View File

@ -0,0 +1,64 @@
#ifndef _BCACHE_WRITEBACK_H
#define _BCACHE_WRITEBACK_H
#define CUTOFF_WRITEBACK 40
#define CUTOFF_WRITEBACK_SYNC 70
static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
{
uint64_t i, ret = 0;
for (i = 0; i < d->nr_stripes; i++)
ret += atomic_read(d->stripe_sectors_dirty + i);
return ret;
}
static inline bool bcache_dev_stripe_dirty(struct bcache_device *d,
uint64_t offset,
unsigned nr_sectors)
{
uint64_t stripe = offset >> d->stripe_size_bits;
while (1) {
if (atomic_read(d->stripe_sectors_dirty + stripe))
return true;
if (nr_sectors <= 1 << d->stripe_size_bits)
return false;
nr_sectors -= 1 << d->stripe_size_bits;
stripe++;
}
}
static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
unsigned cache_mode, bool would_skip)
{
unsigned in_use = dc->disk.c->gc_stats.in_use;
if (cache_mode != CACHE_MODE_WRITEBACK ||
atomic_read(&dc->disk.detaching) ||
in_use > CUTOFF_WRITEBACK_SYNC)
return false;
if (dc->partial_stripes_expensive &&
bcache_dev_stripe_dirty(&dc->disk, bio->bi_sector,
bio_sectors(bio)))
return true;
if (would_skip)
return false;
return bio->bi_rw & REQ_SYNC ||
in_use <= CUTOFF_WRITEBACK;
}
void bcache_dev_sectors_dirty_add(struct cache_set *, unsigned, uint64_t, int);
void bch_writeback_queue(struct cached_dev *);
void bch_writeback_add(struct cached_dev *);
void bch_sectors_dirty_init(struct cached_dev *dc);
void bch_cached_dev_writeback_init(struct cached_dev *);
#endif

6
include/linux/drbd.h
View File

@ -177,7 +177,11 @@ enum drbd_ret_code {
ERR_NEED_APV_100 = 163,
ERR_NEED_ALLOW_TWO_PRI = 164,
ERR_MD_UNCLEAN = 165,
ERR_MD_LAYOUT_CONNECTED = 166,
ERR_MD_LAYOUT_TOO_BIG = 167,
ERR_MD_LAYOUT_TOO_SMALL = 168,
ERR_MD_LAYOUT_NO_FIT = 169,
ERR_IMPLICIT_SHRINK = 170,
/* insert new ones above this line */
AFTER_LAST_ERR_CODE
};

2
include/linux/drbd_genl.h
View File

@ -181,6 +181,8 @@ GENL_struct(DRBD_NLA_RESIZE_PARMS, 7, resize_parms,
__u64_field(1, DRBD_GENLA_F_MANDATORY, resize_size)
__flg_field(2, DRBD_GENLA_F_MANDATORY, resize_force)
__flg_field(3, DRBD_GENLA_F_MANDATORY, no_resync)
__u32_field_def(4, 0 /* OPTIONAL */, al_stripes, DRBD_AL_STRIPES_DEF)
__u32_field_def(5, 0 /* OPTIONAL */, al_stripe_size, DRBD_AL_STRIPE_SIZE_DEF)
)
GENL_struct(DRBD_NLA_STATE_INFO, 8, state_info,

9
include/linux/drbd_limits.h
View File

@ -215,4 +215,13 @@
#define DRBD_ALWAYS_ASBP_DEF 0
#define DRBD_USE_RLE_DEF 1
#define DRBD_AL_STRIPES_MIN 1
#define DRBD_AL_STRIPES_MAX 1024
#define DRBD_AL_STRIPES_DEF 1
#define DRBD_AL_STRIPES_SCALE '1'
#define DRBD_AL_STRIPE_SIZE_MIN 4
#define DRBD_AL_STRIPE_SIZE_MAX 16777216
#define DRBD_AL_STRIPE_SIZE_DEF 32
#define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */
#endif

477
include/trace/events/bcache.h
View File

@ -9,9 +9,7 @@
struct search;
DECLARE_EVENT_CLASS(bcache_request,
TP_PROTO(struct search *s, struct bio *bio),
TP_ARGS(s, bio),
TP_STRUCT__entry(
@ -22,7 +20,6 @@ DECLARE_EVENT_CLASS(bcache_request,
__field(dev_t, orig_sector )
__field(unsigned int, nr_sector )
__array(char, rwbs, 6 )
__array(char, comm, TASK_COMM_LEN )
),
TP_fast_assign(
@ -33,36 +30,66 @@ DECLARE_EVENT_CLASS(bcache_request,
__entry->orig_sector = bio->bi_sector - 16;
__entry->nr_sector = bio->bi_size >> 9;
blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
TP_printk("%d,%d %s %llu + %u [%s] (from %d,%d @ %llu)",
TP_printk("%d,%d %s %llu + %u (from %d,%d @ %llu)",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->rwbs,
(unsigned long long)__entry->sector,
__entry->nr_sector, __entry->comm,
__entry->orig_major, __entry->orig_minor,
__entry->rwbs, (unsigned long long)__entry->sector,
__entry->nr_sector, __entry->orig_major, __entry->orig_minor,
(unsigned long long)__entry->orig_sector)
);
DECLARE_EVENT_CLASS(bkey,
TP_PROTO(struct bkey *k),
TP_ARGS(k),
TP_STRUCT__entry(
__field(u32, size )
__field(u32, inode )
__field(u64, offset )
__field(bool, dirty )
),
TP_fast_assign(
__entry->inode = KEY_INODE(k);
__entry->offset = KEY_OFFSET(k);
__entry->size = KEY_SIZE(k);
__entry->dirty = KEY_DIRTY(k);
),
TP_printk("%u:%llu len %u dirty %u", __entry->inode,
__entry->offset, __entry->size, __entry->dirty)
);
DECLARE_EVENT_CLASS(btree_node,
TP_PROTO(struct btree *b),
TP_ARGS(b),
TP_STRUCT__entry(
__field(size_t, bucket )
),
TP_fast_assign(
__entry->bucket = PTR_BUCKET_NR(b->c, &b->key, 0);
),
TP_printk("bucket %zu", __entry->bucket)
);
/* request.c */
DEFINE_EVENT(bcache_request, bcache_request_start,
TP_PROTO(struct search *s, struct bio *bio),
TP_ARGS(s, bio)
);
DEFINE_EVENT(bcache_request, bcache_request_end,
TP_PROTO(struct search *s, struct bio *bio),
TP_ARGS(s, bio)
);
DECLARE_EVENT_CLASS(bcache_bio,
TP_PROTO(struct bio *bio),
TP_ARGS(bio),
TP_STRUCT__entry(
@ -70,7 +97,6 @@ DECLARE_EVENT_CLASS(bcache_bio,
__field(sector_t, sector )
__field(unsigned int, nr_sector )
__array(char, rwbs, 6 )
__array(char, comm, TASK_COMM_LEN )
),
TP_fast_assign(
@ -78,191 +104,328 @@ DECLARE_EVENT_CLASS(bcache_bio,
__entry->sector = bio->bi_sector;
__entry->nr_sector = bio->bi_size >> 9;
blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
TP_printk("%d,%d %s %llu + %u [%s]",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->rwbs,
(unsigned long long)__entry->sector,
__entry->nr_sector, __entry->comm)
TP_printk("%d,%d %s %llu + %u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
(unsigned long long)__entry->sector, __entry->nr_sector)
);
DEFINE_EVENT(bcache_bio, bcache_passthrough,
DEFINE_EVENT(bcache_bio, bcache_bypass_sequential,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_cache_hit,
DEFINE_EVENT(bcache_bio, bcache_bypass_congested,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_cache_miss,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_read_retry,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_writethrough,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_writeback,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_write_skip,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_btree_read,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_btree_write,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_write_dirty,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_read_dirty,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_write_moving,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_read_moving,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bcache_bio, bcache_journal_write,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DECLARE_EVENT_CLASS(bcache_cache_bio,
TP_PROTO(struct bio *bio,
sector_t orig_sector,
struct block_device* orig_bdev),
TP_ARGS(bio, orig_sector, orig_bdev),
TRACE_EVENT(bcache_read,
TP_PROTO(struct bio *bio, bool hit, bool bypass),
TP_ARGS(bio, hit, bypass),
TP_STRUCT__entry(
__field(dev_t, dev )
__field(dev_t, orig_dev )
__field(sector_t, sector )
__field(sector_t, orig_sector )
__field(unsigned int, nr_sector )
__array(char, rwbs, 6 )
__array(char, comm, TASK_COMM_LEN )
__field(bool, cache_hit )
__field(bool, bypass )
),
TP_fast_assign(
__entry->dev = bio->bi_bdev->bd_dev;
__entry->orig_dev = orig_bdev->bd_dev;
__entry->sector = bio->bi_sector;
__entry->orig_sector = orig_sector;
__entry->nr_sector = bio->bi_size >> 9;
blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
__entry->cache_hit = hit;
__entry->bypass = bypass;
),
TP_printk("%d,%d %s %llu + %u [%s] (from %d,%d %llu)",
TP_printk("%d,%d %s %llu + %u hit %u bypass %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->rwbs,
(unsigned long long)__entry->sector,
__entry->nr_sector, __entry->comm,
MAJOR(__entry->orig_dev), MINOR(__entry->orig_dev),
(unsigned long long)__entry->orig_sector)
__entry->rwbs, (unsigned long long)__entry->sector,
__entry->nr_sector, __entry->cache_hit, __entry->bypass)
);
DEFINE_EVENT(bcache_cache_bio, bcache_cache_insert,
TP_PROTO(struct bio *bio,
sector_t orig_sector,
struct block_device *orig_bdev),
TP_ARGS(bio, orig_sector, orig_bdev)
);
DECLARE_EVENT_CLASS(bcache_gc,
TP_PROTO(uint8_t *uuid),
TP_ARGS(uuid),
TRACE_EVENT(bcache_write,
TP_PROTO(struct bio *bio, bool writeback, bool bypass),
TP_ARGS(bio, writeback, bypass),
TP_STRUCT__entry(
__field(uint8_t *, uuid)
__field(dev_t, dev )
__field(sector_t, sector )
__field(unsigned int, nr_sector )
__array(char, rwbs, 6 )
__field(bool, writeback )
__field(bool, bypass )
),
TP_fast_assign(
__entry->uuid = uuid;
__entry->dev = bio->bi_bdev->bd_dev;
__entry->sector = bio->bi_sector;
__entry->nr_sector = bio->bi_size >> 9;
blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
__entry->writeback = writeback;
__entry->bypass = bypass;
),
TP_printk("%d,%d %s %llu + %u hit %u bypass %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->rwbs, (unsigned long long)__entry->sector,
__entry->nr_sector, __entry->writeback, __entry->bypass)
);
DEFINE_EVENT(bcache_bio, bcache_read_retry,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
DEFINE_EVENT(bkey, bcache_cache_insert,
TP_PROTO(struct bkey *k),
TP_ARGS(k)
);
/* Journal */
DECLARE_EVENT_CLASS(cache_set,
TP_PROTO(struct cache_set *c),
TP_ARGS(c),
TP_STRUCT__entry(
__array(char, uuid, 16 )
),
TP_fast_assign(
memcpy(__entry->uuid, c->sb.set_uuid, 16);
),
TP_printk("%pU", __entry->uuid)
);
DEFINE_EVENT(bcache_gc, bcache_gc_start,
TP_PROTO(uint8_t *uuid),
TP_ARGS(uuid)
DEFINE_EVENT(bkey, bcache_journal_replay_key,
TP_PROTO(struct bkey *k),
TP_ARGS(k)
);
DEFINE_EVENT(bcache_gc, bcache_gc_end,
DEFINE_EVENT(cache_set, bcache_journal_full,
TP_PROTO(struct cache_set *c),
TP_ARGS(c)
);
TP_PROTO(uint8_t *uuid),
DEFINE_EVENT(cache_set, bcache_journal_entry_full,
TP_PROTO(struct cache_set *c),
TP_ARGS(c)
);
TP_ARGS(uuid)
DEFINE_EVENT(bcache_bio, bcache_journal_write,
TP_PROTO(struct bio *bio),
TP_ARGS(bio)
);
/* Btree */
DEFINE_EVENT(cache_set, bcache_btree_cache_cannibalize,
TP_PROTO(struct cache_set *c),
TP_ARGS(c)
);
DEFINE_EVENT(btree_node, bcache_btree_read,
TP_PROTO(struct btree *b),
TP_ARGS(b)
);
TRACE_EVENT(bcache_btree_write,
TP_PROTO(struct btree *b),
TP_ARGS(b),
TP_STRUCT__entry(
__field(size_t, bucket )
__field(unsigned, block )
__field(unsigned, keys )
),
TP_fast_assign(
__entry->bucket = PTR_BUCKET_NR(b->c, &b->key, 0);
__entry->block = b->written;
__entry->keys = b->sets[b->nsets].data->keys;
),
TP_printk("bucket %zu", __entry->bucket)
);
DEFINE_EVENT(btree_node, bcache_btree_node_alloc,
TP_PROTO(struct btree *b),
TP_ARGS(b)
);
DEFINE_EVENT(btree_node, bcache_btree_node_alloc_fail,
TP_PROTO(struct btree *b),
TP_ARGS(b)
);
DEFINE_EVENT(btree_node, bcache_btree_node_free,
TP_PROTO(struct btree *b),
TP_ARGS(b)
);
TRACE_EVENT(bcache_btree_gc_coalesce,
TP_PROTO(unsigned nodes),
TP_ARGS(nodes),
TP_STRUCT__entry(
__field(unsigned, nodes )
),
TP_fast_assign(
__entry->nodes = nodes;
),
TP_printk("coalesced %u nodes", __entry->nodes)
);
DEFINE_EVENT(cache_set, bcache_gc_start,
TP_PROTO(struct cache_set *c),
TP_ARGS(c)
);
DEFINE_EVENT(cache_set, bcache_gc_end,
TP_PROTO(struct cache_set *c),
TP_ARGS(c)
);
DEFINE_EVENT(bkey, bcache_gc_copy,
TP_PROTO(struct bkey *k),
TP_ARGS(k)
);
DEFINE_EVENT(bkey, bcache_gc_copy_collision,
TP_PROTO(struct bkey *k),
TP_ARGS(k)
);
TRACE_EVENT(bcache_btree_insert_key,
TP_PROTO(struct btree *b, struct bkey *k, unsigned op, unsigned status),
TP_ARGS(b, k, op, status),
TP_STRUCT__entry(
__field(u64, btree_node )
__field(u32, btree_level )
__field(u32, inode )
__field(u64, offset )
__field(u32, size )
__field(u8, dirty )
__field(u8, op )
__field(u8, status )
),
TP_fast_assign(
__entry->btree_node = PTR_BUCKET_NR(b->c, &b->key, 0);
__entry->btree_level = b->level;
__entry->inode = KEY_INODE(k);
__entry->offset = KEY_OFFSET(k);
__entry->size = KEY_SIZE(k);
__entry->dirty = KEY_DIRTY(k);
__entry->op = op;
__entry->status = status;
),
TP_printk("%u for %u at %llu(%u): %u:%llu len %u dirty %u",
__entry->status, __entry->op,
__entry->btree_node, __entry->btree_level,
__entry->inode, __entry->offset,
__entry->size, __entry->dirty)
);
DECLARE_EVENT_CLASS(btree_split,
TP_PROTO(struct btree *b, unsigned keys),
TP_ARGS(b, keys),
TP_STRUCT__entry(
__field(size_t, bucket )
__field(unsigned, keys )
),
TP_fast_assign(
__entry->bucket = PTR_BUCKET_NR(b->c, &b->key, 0);
__entry->keys = keys;
),
TP_printk("bucket %zu keys %u", __entry->bucket, __entry->keys)
);
DEFINE_EVENT(btree_split, bcache_btree_node_split,
TP_PROTO(struct btree *b, unsigned keys),
TP_ARGS(b, keys)
);
DEFINE_EVENT(btree_split, bcache_btree_node_compact,
TP_PROTO(struct btree *b, unsigned keys),
TP_ARGS(b, keys)
);
DEFINE_EVENT(btree_node, bcache_btree_set_root,
TP_PROTO(struct btree *b),
TP_ARGS(b)
);
/* Allocator */
TRACE_EVENT(bcache_alloc_invalidate,
TP_PROTO(struct cache *ca),
TP_ARGS(ca),
TP_STRUCT__entry(
__field(unsigned, free )
__field(unsigned, free_inc )
__field(unsigned, free_inc_size )
__field(unsigned, unused )
),
TP_fast_assign(
__entry->free = fifo_used(&ca->free);
__entry->free_inc = fifo_used(&ca->free_inc);
__entry->free_inc_size = ca->free_inc.size;
__entry->unused = fifo_used(&ca->unused);
),
TP_printk("free %u free_inc %u/%u unused %u", __entry->free,
__entry->free_inc, __entry->free_inc_size, __entry->unused)
);
TRACE_EVENT(bcache_alloc_fail,
TP_PROTO(struct cache *ca),
TP_ARGS(ca),
TP_STRUCT__entry(
__field(unsigned, free )
__field(unsigned, free_inc )
__field(unsigned, unused )
__field(unsigned, blocked )
),
TP_fast_assign(
__entry->free = fifo_used(&ca->free);
__entry->free_inc = fifo_used(&ca->free_inc);
__entry->unused = fifo_used(&ca->unused);
__entry->blocked = atomic_read(&ca->set->prio_blocked);
),
TP_printk("free %u free_inc %u unused %u blocked %u", __entry->free,
__entry->free_inc, __entry->unused, __entry->blocked)
);
/* Background writeback */
DEFINE_EVENT(bkey, bcache_writeback,
TP_PROTO(struct bkey *k),
TP_ARGS(k)
);
DEFINE_EVENT(bkey, bcache_writeback_collision,
TP_PROTO(struct bkey *k),
TP_ARGS(k)
);
#endif /* _TRACE_BCACHE_H */

53
include/xen/interface/io/blkif.h
View File

@ -102,6 +102,30 @@ typedef uint64_t blkif_sector_t;
*/
#define BLKIF_OP_DISCARD 5
/*
* Recognized if "feature-max-indirect-segments" in present in the backend
* xenbus info. The "feature-max-indirect-segments" node contains the maximum
* number of segments allowed by the backend per request. If the node is
* present, the frontend might use blkif_request_indirect structs in order to
* issue requests with more than BLKIF_MAX_SEGMENTS_PER_REQUEST (11). The
* maximum number of indirect segments is fixed by the backend, but the
* frontend can issue requests with any number of indirect segments as long as
* it's less than the number provided by the backend. The indirect_grefs field
* in blkif_request_indirect should be filled by the frontend with the
* grant references of the pages that are holding the indirect segments.
* This pages are filled with an array of blkif_request_segment_aligned
* that hold the information about the segments. The number of indirect
* pages to use is determined by the maximum number of segments
* a indirect request contains. Every indirect page can contain a maximum
* of 512 segments (PAGE_SIZE/sizeof(blkif_request_segment_aligned)),
* so to calculate the number of indirect pages to use we have to do
* ceil(indirect_segments/512).
*
* If a backend does not recognize BLKIF_OP_INDIRECT, it should *not*
* create the "feature-max-indirect-segments" node!
*/
#define BLKIF_OP_INDIRECT 6
/*
* Maximum scatter/gather segments per request.
* This is carefully chosen so that sizeof(struct blkif_ring) <= PAGE_SIZE.
@ -109,6 +133,16 @@ typedef uint64_t blkif_sector_t;
*/
#define BLKIF_MAX_SEGMENTS_PER_REQUEST 11
#define BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST 8
struct blkif_request_segment_aligned {
grant_ref_t gref; /* reference to I/O buffer frame */
/* @first_sect: first sector in frame to transfer (inclusive). */
/* @last_sect: last sector in frame to transfer (inclusive). */
uint8_t first_sect, last_sect;
uint16_t _pad; /* padding to make it 8 bytes, so it's cache-aligned */
} __attribute__((__packed__));
struct blkif_request_rw {
uint8_t nr_segments; /* number of segments */
blkif_vdev_t handle; /* only for read/write requests */
@ -147,12 +181,31 @@ struct blkif_request_other {
uint64_t id; /* private guest value, echoed in resp */
} __attribute__((__packed__));
struct blkif_request_indirect {
uint8_t indirect_op;
uint16_t nr_segments;
#ifdef CONFIG_X86_64
uint32_t _pad1; /* offsetof(blkif_...,u.indirect.id) == 8 */
#endif
uint64_t id;
blkif_sector_t sector_number;
blkif_vdev_t handle;
uint16_t _pad2;
grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST];
#ifdef CONFIG_X86_64
uint32_t _pad3; /* make it 64 byte aligned */
#else
uint64_t _pad3; /* make it 64 byte aligned */
#endif
} __attribute__((__packed__));
struct blkif_request {
uint8_t operation; /* BLKIF_OP_??? */
union {
struct blkif_request_rw rw;
struct blkif_request_discard discard;
struct blkif_request_other other;
struct blkif_request_indirect indirect;
} u;
} __attribute__((__packed__));

5
include/xen/interface/io/ring.h
View File

@ -188,6 +188,11 @@ struct __name##_back_ring { \
#define RING_REQUEST_CONS_OVERFLOW(_r, _cons) \
(((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))
/* Ill-behaved frontend determination: Can there be this many requests? */
#define RING_REQUEST_PROD_OVERFLOW(_r, _prod) \
(((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))
#define RING_PUSH_REQUESTS(_r) do { \
wmb(); /* back sees requests /before/ updated producer index */ \
(_r)->sring->req_prod = (_r)->req_prod_pvt; \