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Merge branch 'for-4.2/core' into for-4.2/drivers

Browse Source 
We need the blkdev_reread_part() changes for drivers to adapt.
This commit is contained in:
Jens Axboe 2015-05-20 09:05:57 -06:00
commit b816d45fd5
20 changed files with 285 additions and 291 deletions
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33
block/blk-core.c
View File

@ -1522,7 +1522,8 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
* Caller must ensure !blk_queue_nomerges(q) beforehand.
*/
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int *request_count)
unsigned int *request_count,
struct request **same_queue_rq)
{
struct blk_plug *plug;
struct request *rq;
@ -1542,8 +1543,16 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
list_for_each_entry_reverse(rq, plug_list, queuelist) {
int el_ret;
if (rq->q == q)
if (rq->q == q) {
(*request_count)++;
/*
* Only blk-mq multiple hardware queues case checks the
* rq in the same queue, there should be only one such
* rq in a queue
**/
if (same_queue_rq)
*same_queue_rq = rq;
}
if (rq->q != q || !blk_rq_merge_ok(rq, bio))
continue;
@ -1608,7 +1617,7 @@ void blk_queue_bio(struct request_queue *q, struct bio *bio)
* any locks.
*/
if (!blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count))
blk_attempt_plug_merge(q, bio, &request_count, NULL))
return;
spin_lock_irq(q->queue_lock);
@ -1716,8 +1725,6 @@ static void handle_bad_sector(struct bio *bio)
bio->bi_rw,
(unsigned long long)bio_end_sector(bio),
(long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));
set_bit(BIO_EOF, &bio->bi_flags);
}
#ifdef CONFIG_FAIL_MAKE_REQUEST
@ -3032,22 +3039,21 @@ void blk_start_plug(struct blk_plug *plug)
{
struct task_struct *tsk = current;
/*
* If this is a nested plug, don't actually assign it.
*/
if (tsk->plug)
return;
INIT_LIST_HEAD(&plug->list);
INIT_LIST_HEAD(&plug->mq_list);
INIT_LIST_HEAD(&plug->cb_list);
/*
* If this is a nested plug, don't actually assign it. It will be
* flushed on its own.
*/
if (!tsk->plug) {
/*
* Store ordering should not be needed here, since a potential
* preempt will imply a full memory barrier
*/
tsk->plug = plug;
}
}
EXPORT_SYMBOL(blk_start_plug);
static int plug_rq_cmp(void *priv, struct list_head *a, struct list_head *b)
@ -3193,9 +3199,10 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
void blk_finish_plug(struct blk_plug *plug)
{
if (plug != current->plug)
return;
blk_flush_plug_list(plug, false);
if (plug == current->plug)
current->plug = NULL;
}
EXPORT_SYMBOL(blk_finish_plug);

128
block/blk-mq.c
View File

@ -89,7 +89,8 @@ static int blk_mq_queue_enter(struct request_queue *q, gfp_t gfp)
return -EBUSY;
ret = wait_event_interruptible(q->mq_freeze_wq,
!q->mq_freeze_depth || blk_queue_dying(q));
!atomic_read(&q->mq_freeze_depth) ||
blk_queue_dying(q));
if (blk_queue_dying(q))
return -ENODEV;
if (ret)
@ -112,13 +113,10 @@ static void blk_mq_usage_counter_release(struct percpu_ref *ref)
void blk_mq_freeze_queue_start(struct request_queue *q)
{
bool freeze;
int freeze_depth;
spin_lock_irq(q->queue_lock);
freeze = !q->mq_freeze_depth++;
spin_unlock_irq(q->queue_lock);
if (freeze) {
freeze_depth = atomic_inc_return(&q->mq_freeze_depth);
if (freeze_depth == 1) {
percpu_ref_kill(&q->mq_usage_counter);
blk_mq_run_hw_queues(q, false);
}
@ -143,13 +141,11 @@ EXPORT_SYMBOL_GPL(blk_mq_freeze_queue);
void blk_mq_unfreeze_queue(struct request_queue *q)
{
bool wake;
int freeze_depth;
spin_lock_irq(q->queue_lock);
wake = !--q->mq_freeze_depth;
WARN_ON_ONCE(q->mq_freeze_depth < 0);
spin_unlock_irq(q->queue_lock);
if (wake) {
freeze_depth = atomic_dec_return(&q->mq_freeze_depth);
WARN_ON_ONCE(freeze_depth < 0);
if (!freeze_depth) {
percpu_ref_reinit(&q->mq_usage_counter);
wake_up_all(&q->mq_freeze_wq);
}
@ -1224,6 +1220,38 @@ static struct request *blk_mq_map_request(struct request_queue *q,
return rq;
}
static int blk_mq_direct_issue_request(struct request *rq)
{
int ret;
struct request_queue *q = rq->q;
struct blk_mq_hw_ctx *hctx = q->mq_ops->map_queue(q,
rq->mq_ctx->cpu);
struct blk_mq_queue_data bd = {
.rq = rq,
.list = NULL,
.last = 1
};
/*
* For OK queue, we are done. For error, kill it. Any other
* error (busy), just add it to our list as we previously
* would have done
*/
ret = q->mq_ops->queue_rq(hctx, &bd);
if (ret == BLK_MQ_RQ_QUEUE_OK)
return 0;
else {
__blk_mq_requeue_request(rq);
if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
rq->errors = -EIO;
blk_mq_end_request(rq, rq->errors);
return 0;
}
return -1;
}
}
/*
* Multiple hardware queue variant. This will not use per-process plugs,
* but will attempt to bypass the hctx queueing if we can go straight to
@ -1235,6 +1263,9 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
struct blk_map_ctx data;
struct request *rq;
unsigned int request_count = 0;
struct blk_plug *plug;
struct request *same_queue_rq = NULL;
blk_queue_bounce(q, &bio);
@ -1243,6 +1274,10 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
return;
}
if (!is_flush_fua && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq))
return;
rq = blk_mq_map_request(q, bio, &data);
if (unlikely(!rq))
return;
@ -1253,38 +1288,42 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
goto run_queue;
}
plug = current->plug;
/*
* If the driver supports defer issued based on 'last', then
* queue it up like normal since we can potentially save some
* CPU this way.
*/
if (is_sync && !(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) {
struct blk_mq_queue_data bd = {
.rq = rq,
.list = NULL,
.last = 1
};
int ret;
if (((plug && !blk_queue_nomerges(q)) || is_sync) &&
!(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) {
struct request *old_rq = NULL;
blk_mq_bio_to_request(rq, bio);
/*
* For OK queue, we are done. For error, kill it. Any other
* error (busy), just add it to our list as we previously
* would have done
* we do limited pluging. If bio can be merged, do merge.
* Otherwise the existing request in the plug list will be
* issued. So the plug list will have one request at most
*/
ret = q->mq_ops->queue_rq(data.hctx, &bd);
if (ret == BLK_MQ_RQ_QUEUE_OK)
goto done;
else {
__blk_mq_requeue_request(rq);
if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
rq->errors = -EIO;
blk_mq_end_request(rq, rq->errors);
goto done;
}
if (plug) {
/*
* The plug list might get flushed before this. If that
* happens, same_queue_rq is invalid and plug list is empty
**/
if (same_queue_rq && !list_empty(&plug->mq_list)) {
old_rq = same_queue_rq;
list_del_init(&old_rq->queuelist);
}
list_add_tail(&rq->queuelist, &plug->mq_list);
} else /* is_sync */
old_rq = rq;
blk_mq_put_ctx(data.ctx);
if (!old_rq)
return;
if (!blk_mq_direct_issue_request(old_rq))
return;
blk_mq_insert_request(old_rq, false, true, true);
return;
}
if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) {
@ -1297,7 +1336,6 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
run_queue:
blk_mq_run_hw_queue(data.hctx, !is_sync || is_flush_fua);
}
done:
blk_mq_put_ctx(data.ctx);
}
@ -1309,16 +1347,11 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
{
const int is_sync = rw_is_sync(bio->bi_rw);
const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
unsigned int use_plug, request_count = 0;
struct blk_plug *plug;
unsigned int request_count = 0;
struct blk_map_ctx data;
struct request *rq;
/*
* If we have multiple hardware queues, just go directly to
* one of those for sync IO.
*/
use_plug = !is_flush_fua && !is_sync;
blk_queue_bounce(q, &bio);
if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
@ -1326,8 +1359,8 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
return;
}
if (use_plug && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count))
if (!is_flush_fua && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count, NULL))
return;
rq = blk_mq_map_request(q, bio, &data);
@ -1345,9 +1378,7 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
* utilize that to temporarily store requests until the task is
* either done or scheduled away.
*/
if (use_plug) {
struct blk_plug *plug = current->plug;
plug = current->plug;
if (plug) {
blk_mq_bio_to_request(rq, bio);
if (list_empty(&plug->mq_list))
@ -1360,7 +1391,6 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
blk_mq_put_ctx(data.ctx);
return;
}
}
if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) {
/*
@ -2047,7 +2077,7 @@ void blk_mq_free_queue(struct request_queue *q)
/* Basically redo blk_mq_init_queue with queue frozen */
static void blk_mq_queue_reinit(struct request_queue *q)
{
WARN_ON_ONCE(!q->mq_freeze_depth);
WARN_ON_ONCE(!atomic_read(&q->mq_freeze_depth));
blk_mq_sysfs_unregister(q);

3
block/blk.h
View File

@ -78,7 +78,8 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
struct bio *bio);
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int *request_count);
unsigned int *request_count,
struct request **same_queue_rq);
void blk_account_io_start(struct request *req, bool new_io);
void blk_account_io_completion(struct request *req, unsigned int bytes);

3
block/bounce.c
View File

@ -128,9 +128,6 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
struct bio_vec *bvec, *org_vec;
int i;
if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
set_bit(BIO_EOPNOTSUPP, &bio_orig->bi_flags);
/*
* free up bounce indirect pages used
*/

37
block/ioctl.c
View File

@ -150,21 +150,48 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
}
}
static int blkdev_reread_part(struct block_device *bdev)
/*
* This is an exported API for the block driver, and will not
* acquire bd_mutex. This API should be used in case that
* caller has held bd_mutex already.
*/
int __blkdev_reread_part(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
int res;
if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!mutex_trylock(&bdev->bd_mutex))
return -EBUSY;
res = rescan_partitions(disk, bdev);
lockdep_assert_held(&bdev->bd_mutex);
return rescan_partitions(disk, bdev);
}
EXPORT_SYMBOL(__blkdev_reread_part);
/*
* This is an exported API for the block driver, and will
* try to acquire bd_mutex. If bd_mutex has been held already
* in current context, please call __blkdev_reread_part().
*
* Make sure the held locks in current context aren't required
* in open()/close() handler and I/O path for avoiding ABBA deadlock:
* - bd_mutex is held before calling block driver's open/close
* handler
* - reading partition table may submit I/O to the block device
*/
int blkdev_reread_part(struct block_device *bdev)
{
int res;
mutex_lock(&bdev->bd_mutex);
res = __blkdev_reread_part(bdev);
mutex_unlock(&bdev->bd_mutex);
return res;
}
EXPORT_SYMBOL(blkdev_reread_part);
static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
uint64_t len, int secure)

11
fs/btrfs/disk-io.c
View File

@ -3269,11 +3269,8 @@ static int write_dev_supers(struct btrfs_device *device,
*/
static void btrfs_end_empty_barrier(struct bio *bio, int err)
{
if (err) {
if (err == -EOPNOTSUPP)
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
if (err)
clear_bit(BIO_UPTODATE, &bio->bi_flags);
}
if (bio->bi_private)
complete(bio->bi_private);
bio_put(bio);
@ -3301,11 +3298,7 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
wait_for_completion(&device->flush_wait);
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
printk_in_rcu("BTRFS: disabling barriers on dev %s\n",
rcu_str_deref(device->name));
device->nobarriers = 1;
} else if (!bio_flagged(bio, BIO_UPTODATE)) {
if (!bio_flagged(bio, BIO_UPTODATE)) {
ret = -EIO;
btrfs_dev_stat_inc_and_print(device,
BTRFS_DEV_STAT_FLUSH_ERRS);

2
fs/btrfs/extent_io.c
View File

@ -2767,8 +2767,6 @@ static int __must_check submit_one_bio(int rw, struct bio *bio,
else
btrfsic_submit_bio(rw, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP;
bio_put(bio);
return ret;
}

10
fs/buffer.c
View File

@ -2938,10 +2938,6 @@ static void end_bio_bh_io_sync(struct bio *bio, int err)
{
struct buffer_head *bh = bio->bi_private;
if (err == -EOPNOTSUPP) {
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
}
if (unlikely (test_bit(BIO_QUIET,&bio->bi_flags)))
set_bit(BH_Quiet, &bh->b_state);
@ -3041,13 +3037,7 @@ int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags)
if (buffer_prio(bh))
rw |= REQ_PRIO;
bio_get(bio);
submit_bio(rw, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP;
bio_put(bio);
return ret;
}
EXPORT_SYMBOL_GPL(_submit_bh);

1
fs/ext4/page-io.c
View File

@ -359,7 +359,6 @@ void ext4_io_submit(struct ext4_io_submit *io)
if (bio) {
bio_get(io->io_bio);
submit_bio(io->io_op, io->io_bio);
BUG_ON(bio_flagged(io->io_bio, BIO_EOPNOTSUPP));
bio_put(io->io_bio);
}
io->io_bio = NULL;

12
fs/nilfs2/segbuf.c
View File

@ -343,11 +343,6 @@ static void nilfs_end_bio_write(struct bio *bio, int err)
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct nilfs_segment_buffer *segbuf = bio->bi_private;
if (err == -EOPNOTSUPP) {
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
/* to be detected by nilfs_segbuf_submit_bio() */
}
if (!uptodate)
atomic_inc(&segbuf->sb_err);
@ -374,15 +369,8 @@ static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
bio->bi_end_io = nilfs_end_bio_write;
bio->bi_private = segbuf;
bio_get(bio);
submit_bio(mode, bio);
segbuf->sb_nbio++;
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
bio_put(bio);
err = -EOPNOTSUPP;
goto failed;
}
bio_put(bio);
wi->bio = NULL;
wi->rest_blocks -= wi->end - wi->start;

21
include/linux/blk_types.h
View File

@ -112,18 +112,15 @@ struct bio {
* bio flags
*/
#define BIO_UPTODATE 0 /* ok after I/O completion */
#define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
#define BIO_EOF 2 /* out-out-bounds error */
#define BIO_SEG_VALID 3 /* bi_phys_segments valid */
#define BIO_CLONED 4 /* doesn't own data */
#define BIO_BOUNCED 5 /* bio is a bounce bio */
#define BIO_USER_MAPPED 6 /* contains user pages */
#define BIO_EOPNOTSUPP 7 /* not supported */
#define BIO_NULL_MAPPED 8 /* contains invalid user pages */
#define BIO_QUIET 9 /* Make BIO Quiet */
#define BIO_SNAP_STABLE 10 /* bio data must be snapshotted during write */
#define BIO_CHAIN 11 /* chained bio, ->bi_remaining in effect */
#define BIO_REFFED 12 /* bio has elevated ->bi_cnt */
#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
#define BIO_CLONED 2 /* doesn't own data */
#define BIO_BOUNCED 3 /* bio is a bounce bio */
#define BIO_USER_MAPPED 4 /* contains user pages */
#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
#define BIO_QUIET 6 /* Make BIO Quiet */
#define BIO_SNAP_STABLE 7 /* bio data must be snapshotted during write */
#define BIO_CHAIN 8 /* chained bio, ->bi_remaining in effect */
#define BIO_REFFED 9 /* bio has elevated ->bi_cnt */
/*
* Flags starting here get preserved by bio_reset() - this includes

2
include/linux/blkdev.h
View File

@ -444,7 +444,7 @@ struct request_queue {
struct mutex sysfs_lock;
int bypass_depth;
int mq_freeze_depth;
atomic_t mq_freeze_depth;
#if defined(CONFIG_BLK_DEV_BSG)
bsg_job_fn *bsg_job_fn;

3
include/linux/fs.h
View File

@ -2279,6 +2279,9 @@ extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
void *holder);
extern void blkdev_put(struct block_device *bdev, fmode_t mode);
extern int __blkdev_reread_part(struct block_device *bdev);
extern int blkdev_reread_part(struct block_device *bdev);
#ifdef CONFIG_SYSFS
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
extern void bd_unlink_disk_holder(struct block_device *bdev,

1
include/linux/swap.h
View File

@ -377,7 +377,6 @@ extern void end_swap_bio_write(struct bio *bio, int err);
extern int __swap_writepage(struct page *page, struct writeback_control *wbc,
void (*end_write_func)(struct bio *, int));
extern int swap_set_page_dirty(struct page *page);
extern void end_swap_bio_read(struct bio *bio, int err);
int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
unsigned long nr_pages, sector_t start_block);

3
kernel/power/Makefile
View File

@ -7,8 +7,7 @@ obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o
obj-$(CONFIG_FREEZER) += process.o
obj-$(CONFIG_SUSPEND) += suspend.o
obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \
block_io.o
obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o
obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o

103
kernel/power/block_io.c
View File

@ -1,103 +0,0 @@
/*
* This file provides functions for block I/O operations on swap/file.
*
* Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
*
* This file is released under the GPLv2.
*/
#include <linux/bio.h>
#include <linux/kernel.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include "power.h"
/**
* submit - submit BIO request.
* @rw: READ or WRITE.
* @off physical offset of page.
* @page: page we're reading or writing.
* @bio_chain: list of pending biod (for async reading)
*
* Straight from the textbook - allocate and initialize the bio.
* If we're reading, make sure the page is marked as dirty.
* Then submit it and, if @bio_chain == NULL, wait.
*/
static int submit(int rw, struct block_device *bdev, sector_t sector,
struct page *page, struct bio **bio_chain)
{
const int bio_rw = rw | REQ_SYNC;
struct bio *bio;
bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
bio->bi_iter.bi_sector = sector;
bio->bi_bdev = bdev;
bio->bi_end_io = end_swap_bio_read;
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
printk(KERN_ERR "PM: Adding page to bio failed at %llu\n",
(unsigned long long)sector);
bio_put(bio);
return -EFAULT;
}
lock_page(page);
bio_get(bio);
if (bio_chain == NULL) {
submit_bio(bio_rw, bio);
wait_on_page_locked(page);
if (rw == READ)
bio_set_pages_dirty(bio);
bio_put(bio);
} else {
if (rw == READ)
get_page(page); /* These pages are freed later */
bio->bi_private = *bio_chain;
*bio_chain = bio;
submit_bio(bio_rw, bio);
}
return 0;
}
int hib_bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
{
return submit(READ, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
virt_to_page(addr), bio_chain);
}
int hib_bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
{
return submit(WRITE, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
virt_to_page(addr), bio_chain);
}
int hib_wait_on_bio_chain(struct bio **bio_chain)
{
struct bio *bio;
struct bio *next_bio;
int ret = 0;
if (bio_chain == NULL)
return 0;
bio = *bio_chain;
if (bio == NULL)
return 0;
while (bio) {
struct page *page;
next_bio = bio->bi_private;
page = bio->bi_io_vec[0].bv_page;
wait_on_page_locked(page);
if (!PageUptodate(page) || PageError(page))
ret = -EIO;
put_page(page);
bio_put(bio);
bio = next_bio;
}
*bio_chain = NULL;
return ret;
}

9
kernel/power/power.h
View File

@ -163,15 +163,6 @@ extern void swsusp_close(fmode_t);
extern int swsusp_unmark(void);
#endif
/* kernel/power/block_io.c */
extern struct block_device *hib_resume_bdev;
extern int hib_bio_read_page(pgoff_t page_off, void *addr,
struct bio **bio_chain);
extern int hib_bio_write_page(pgoff_t page_off, void *addr,
struct bio **bio_chain);
extern int hib_wait_on_bio_chain(struct bio **bio_chain);
struct timeval;
/* kernel/power/swsusp.c */
extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);

159
kernel/power/swap.c
View File

@ -212,7 +212,84 @@ int swsusp_swap_in_use(void)
*/
static unsigned short root_swap = 0xffff;
struct block_device *hib_resume_bdev;
static struct block_device *hib_resume_bdev;
struct hib_bio_batch {
atomic_t count;
wait_queue_head_t wait;
int error;
};
static void hib_init_batch(struct hib_bio_batch *hb)
{
atomic_set(&hb->count, 0);
init_waitqueue_head(&hb->wait);
hb->error = 0;
}
static void hib_end_io(struct bio *bio, int error)
{
struct hib_bio_batch *hb = bio->bi_private;
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct page *page = bio->bi_io_vec[0].bv_page;
if (!uptodate || error) {
printk(KERN_ALERT "Read-error on swap-device (%u:%u:%Lu)\n",
imajor(bio->bi_bdev->bd_inode),
iminor(bio->bi_bdev->bd_inode),
(unsigned long long)bio->bi_iter.bi_sector);
if (!error)
error = -EIO;
}
if (bio_data_dir(bio) == WRITE)
put_page(page);
if (error && !hb->error)
hb->error = error;
if (atomic_dec_and_test(&hb->count))
wake_up(&hb->wait);
bio_put(bio);
}
static int hib_submit_io(int rw, pgoff_t page_off, void *addr,
struct hib_bio_batch *hb)
{
struct page *page = virt_to_page(addr);
struct bio *bio;
int error = 0;
bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9);
bio->bi_bdev = hib_resume_bdev;
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
printk(KERN_ERR "PM: Adding page to bio failed at %llu\n",
(unsigned long long)bio->bi_iter.bi_sector);
bio_put(bio);
return -EFAULT;
}
if (hb) {
bio->bi_end_io = hib_end_io;
bio->bi_private = hb;
atomic_inc(&hb->count);
submit_bio(rw, bio);
} else {
error = submit_bio_wait(rw, bio);
bio_put(bio);
}
return error;
}
static int hib_wait_io(struct hib_bio_batch *hb)
{
wait_event(hb->wait, atomic_read(&hb->count) == 0);
return hb->error;
}
/*
* Saving part
@ -222,7 +299,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
{
int error;
hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
hib_submit_io(READ_SYNC, swsusp_resume_block, swsusp_header, NULL);
if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
!memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
@ -231,7 +308,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
swsusp_header->flags = flags;
if (flags & SF_CRC32_MODE)
swsusp_header->crc32 = handle->crc32;
error = hib_bio_write_page(swsusp_resume_block,
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
swsusp_header, NULL);
} else {
printk(KERN_ERR "PM: Swap header not found!\n");
@ -271,10 +348,10 @@ static int swsusp_swap_check(void)
* write_page - Write one page to given swap location.
* @buf: Address we're writing.
* @offset: Offset of the swap page we're writing to.
* @bio_chain: Link the next write BIO here
* @hb: bio completion batch
*/
static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb)
{
void *src;
int ret;
@ -282,13 +359,13 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
if (!offset)
return -ENOSPC;
if (bio_chain) {
if (hb) {
src = (void *)__get_free_page(__GFP_WAIT | __GFP_NOWARN |
__GFP_NORETRY);
if (src) {
copy_page(src, buf);
} else {
ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */
ret = hib_wait_io(hb); /* Free pages */
if (ret)
return ret;
src = (void *)__get_free_page(__GFP_WAIT |
@ -298,14 +375,14 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
copy_page(src, buf);
} else {
WARN_ON_ONCE(1);
bio_chain = NULL; /* Go synchronous */
hb = NULL; /* Go synchronous */
src = buf;
}
}
} else {
src = buf;
}
return hib_bio_write_page(offset, src, bio_chain);
return hib_submit_io(WRITE_SYNC, offset, src, hb);
}
static void release_swap_writer(struct swap_map_handle *handle)
@ -348,7 +425,7 @@ err_close:
}
static int swap_write_page(struct swap_map_handle *handle, void *buf,
struct bio **bio_chain)
struct hib_bio_batch *hb)
{
int error = 0;
sector_t offset;
@ -356,7 +433,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
if (!handle->cur)
return -EINVAL;
offset = alloc_swapdev_block(root_swap);
error = write_page(buf, offset, bio_chain);
error = write_page(buf, offset, hb);
if (error)
return error;
handle->cur->entries[handle->k++] = offset;
@ -365,15 +442,15 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
if (!offset)
return -ENOSPC;
handle->cur->next_swap = offset;
error = write_page(handle->cur, handle->cur_swap, bio_chain);
error = write_page(handle->cur, handle->cur_swap, hb);
if (error)
goto out;
clear_page(handle->cur);
handle->cur_swap = offset;
handle->k = 0;
if (bio_chain && low_free_pages() <= handle->reqd_free_pages) {
error = hib_wait_on_bio_chain(bio_chain);
if (hb && low_free_pages() <= handle->reqd_free_pages) {
error = hib_wait_io(hb);
if (error)
goto out;
/*
@ -445,23 +522,24 @@ static int save_image(struct swap_map_handle *handle,
int ret;
int nr_pages;
int err2;
struct bio *bio;
struct hib_bio_batch hb;
ktime_t start;
ktime_t stop;
hib_init_batch(&hb);
printk(KERN_INFO "PM: Saving image data pages (%u pages)...\n",
nr_to_write);
m = nr_to_write / 10;
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
while (1) {
ret = snapshot_read_next(snapshot);
if (ret <= 0)
break;
ret = swap_write_page(handle, data_of(*snapshot), &bio);
ret = swap_write_page(handle, data_of(*snapshot), &hb);
if (ret)
break;
if (!(nr_pages % m))
@ -469,7 +547,7 @@ static int save_image(struct swap_map_handle *handle,
nr_pages / m * 10);
nr_pages++;
}
err2 = hib_wait_on_bio_chain(&bio);
err2 = hib_wait_io(&hb);
stop = ktime_get();
if (!ret)
ret = err2;
@ -580,7 +658,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
int ret = 0;
int nr_pages;
int err2;
struct bio *bio;
struct hib_bio_batch hb;
ktime_t start;
ktime_t stop;
size_t off;
@ -589,6 +667,8 @@ static int save_image_lzo(struct swap_map_handle *handle,
struct cmp_data *data = NULL;
struct crc_data *crc = NULL;
hib_init_batch(&hb);
/*
* We'll limit the number of threads for compression to limit memory
* footprint.
@ -674,7 +754,6 @@ static int save_image_lzo(struct swap_map_handle *handle,
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
for (;;) {
for (thr = 0; thr < nr_threads; thr++) {
@ -748,7 +827,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
off += PAGE_SIZE) {
memcpy(page, data[thr].cmp + off, PAGE_SIZE);
ret = swap_write_page(handle, page, &bio);
ret = swap_write_page(handle, page, &hb);
if (ret)
goto out_finish;
}
@ -759,7 +838,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
}
out_finish:
err2 = hib_wait_on_bio_chain(&bio);
err2 = hib_wait_io(&hb);
stop = ktime_get();
if (!ret)
ret = err2;
@ -906,7 +985,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
return -ENOMEM;
}
error = hib_bio_read_page(offset, tmp->map, NULL);
error = hib_submit_io(READ_SYNC, offset, tmp->map, NULL);
if (error) {
release_swap_reader(handle);
return error;
@ -919,7 +998,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
}
static int swap_read_page(struct swap_map_handle *handle, void *buf,
struct bio **bio_chain)
struct hib_bio_batch *hb)
{
sector_t offset;
int error;
@ -930,7 +1009,7 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
offset = handle->cur->entries[handle->k];
if (!offset)
return -EFAULT;
error = hib_bio_read_page(offset, buf, bio_chain);
error = hib_submit_io(READ_SYNC, offset, buf, hb);
if (error)
return error;
if (++handle->k >= MAP_PAGE_ENTRIES) {
@ -968,27 +1047,28 @@ static int load_image(struct swap_map_handle *handle,
int ret = 0;
ktime_t start;
ktime_t stop;
struct bio *bio;
struct hib_bio_batch hb;
int err2;
unsigned nr_pages;
hib_init_batch(&hb);
printk(KERN_INFO "PM: Loading image data pages (%u pages)...\n",
nr_to_read);
m = nr_to_read / 10;
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
for ( ; ; ) {
ret = snapshot_write_next(snapshot);
if (ret <= 0)
break;
ret = swap_read_page(handle, data_of(*snapshot), &bio);
ret = swap_read_page(handle, data_of(*snapshot), &hb);
if (ret)
break;
if (snapshot->sync_read)
ret = hib_wait_on_bio_chain(&bio);
ret = hib_wait_io(&hb);
if (ret)
break;
if (!(nr_pages % m))
@ -996,7 +1076,7 @@ static int load_image(struct swap_map_handle *handle,
nr_pages / m * 10);
nr_pages++;
}
err2 = hib_wait_on_bio_chain(&bio);
err2 = hib_wait_io(&hb);
stop = ktime_get();
if (!ret)
ret = err2;
@ -1067,7 +1147,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
unsigned int m;
int ret = 0;
int eof = 0;
struct bio *bio;
struct hib_bio_batch hb;
ktime_t start;
ktime_t stop;
unsigned nr_pages;
@ -1080,6 +1160,8 @@ static int load_image_lzo(struct swap_map_handle *handle,
struct dec_data *data = NULL;
struct crc_data *crc = NULL;
hib_init_batch(&hb);
/*
* We'll limit the number of threads for decompression to limit memory
* footprint.
@ -1190,7 +1272,6 @@ static int load_image_lzo(struct swap_map_handle *handle,
if (!m)
m = 1;
nr_pages = 0;
bio = NULL;
start = ktime_get();
ret = snapshot_write_next(snapshot);
@ -1199,7 +1280,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
for(;;) {
for (i = 0; !eof && i < want; i++) {
ret = swap_read_page(handle, page[ring], &bio);
ret = swap_read_page(handle, page[ring], &hb);
if (ret) {
/*
* On real read error, finish. On end of data,
@ -1226,7 +1307,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
if (!asked)
break;
ret = hib_wait_on_bio_chain(&bio);
ret = hib_wait_io(&hb);
if (ret)
goto out_finish;
have += asked;
@ -1281,7 +1362,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
* Wait for more data while we are decompressing.
*/
if (have < LZO_CMP_PAGES && asked) {
ret = hib_wait_on_bio_chain(&bio);
ret = hib_wait_io(&hb);
if (ret)
goto out_finish;
have += asked;
@ -1430,7 +1511,7 @@ int swsusp_check(void)
if (!IS_ERR(hib_resume_bdev)) {
set_blocksize(hib_resume_bdev, PAGE_SIZE);
clear_page(swsusp_header);
error = hib_bio_read_page(swsusp_resume_block,
error = hib_submit_io(READ_SYNC, swsusp_resume_block,
swsusp_header, NULL);
if (error)
goto put;
@ -1438,7 +1519,7 @@ int swsusp_check(void)
if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
/* Reset swap signature now */
error = hib_bio_write_page(swsusp_resume_block,
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
swsusp_header, NULL);
} else {
error = -EINVAL;
@ -1482,10 +1563,10 @@ int swsusp_unmark(void)
{
int error;
hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
hib_submit_io(READ_SYNC, swsusp_resume_block, swsusp_header, NULL);
if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
error = hib_bio_write_page(swsusp_resume_block,
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
swsusp_header, NULL);
} else {
printk(KERN_ERR "PM: Cannot find swsusp signature!\n");

3
kernel/sched/core.c
View File

@ -4387,10 +4387,7 @@ long __sched io_schedule_timeout(long timeout)
long ret;
current->in_iowait = 1;
if (old_iowait)
blk_schedule_flush_plug(current);
else
blk_flush_plug(current);
delayacct_blkio_start();
rq = raw_rq();

2
mm/page_io.c
View File

@ -69,7 +69,7 @@ void end_swap_bio_write(struct bio *bio, int err)
bio_put(bio);
}
void end_swap_bio_read(struct bio *bio, int err)
static void end_swap_bio_read(struct bio *bio, int err)
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct page *page = bio->bi_io_vec[0].bv_page;