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Btrfs: handle operations for device replace separately

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Since this part is mostly independent, this moves it to a separate
function.

Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-03-14 13:33:58 -07:00 committed by David Sterba
parent 5ab56090b8
commit 73c0f22825
1 changed files with 98 additions and 81 deletions
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179
fs/btrfs/volumes.c
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@ -5532,6 +5532,100 @@ static int get_extra_mirror_from_replace(struct btrfs_fs_info *fs_info,
return ret;
}
static void handle_ops_on_dev_replace(enum btrfs_map_op op,
struct btrfs_bio **bbio_ret,
struct btrfs_dev_replace *dev_replace,
int *num_stripes_ret, int *max_errors_ret)
{
struct btrfs_bio *bbio = *bbio_ret;
u64 srcdev_devid = dev_replace->srcdev->devid;
int tgtdev_indexes = 0;
int num_stripes = *num_stripes_ret;
int max_errors = *max_errors_ret;
int i;
if (op == BTRFS_MAP_WRITE) {
int index_where_to_add;
/*
* duplicate the write operations while the dev replace
* procedure is running. Since the copying of the old disk to
* the new disk takes place at run time while the filesystem is
* mounted writable, the regular write operations to the old
* disk have to be duplicated to go to the new disk as well.
*
* Note that device->missing is handled by the caller, and that
* the write to the old disk is already set up in the stripes
* array.
*/
index_where_to_add = num_stripes;
for (i = 0; i < num_stripes; i++) {
if (bbio->stripes[i].dev->devid == srcdev_devid) {
/* write to new disk, too */
struct btrfs_bio_stripe *new =
bbio->stripes + index_where_to_add;
struct btrfs_bio_stripe *old =
bbio->stripes + i;
new->physical = old->physical;
new->length = old->length;
new->dev = dev_replace->tgtdev;
bbio->tgtdev_map[i] = index_where_to_add;
index_where_to_add++;
max_errors++;
tgtdev_indexes++;
}
}
num_stripes = index_where_to_add;
} else if (op == BTRFS_MAP_GET_READ_MIRRORS) {
int index_srcdev = 0;
int found = 0;
u64 physical_of_found = 0;
/*
* During the dev-replace procedure, the target drive can also
* be used to read data in case it is needed to repair a corrupt
* block elsewhere. This is possible if the requested area is
* left of the left cursor. In this area, the target drive is a
* full copy of the source drive.
*/
for (i = 0; i < num_stripes; i++) {
if (bbio->stripes[i].dev->devid == srcdev_devid) {
/*
* In case of DUP, in order to keep it simple,
* only add the mirror with the lowest physical
* address
*/
if (found &&
physical_of_found <=
bbio->stripes[i].physical)
continue;
index_srcdev = i;
found = 1;
physical_of_found = bbio->stripes[i].physical;
}
}
if (found) {
struct btrfs_bio_stripe *tgtdev_stripe =
bbio->stripes + num_stripes;
tgtdev_stripe->physical = physical_of_found;
tgtdev_stripe->length =
bbio->stripes[index_srcdev].length;
tgtdev_stripe->dev = dev_replace->tgtdev;
bbio->tgtdev_map[index_srcdev] = num_stripes;
tgtdev_indexes++;
num_stripes++;
}
}
*num_stripes_ret = num_stripes;
*max_errors_ret = max_errors;
bbio->num_tgtdevs = tgtdev_indexes;
*bbio_ret = bbio;
}
static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
enum btrfs_map_op op,
u64 logical, u64 *length,
@ -5812,86 +5906,10 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
if (bbio->raid_map)
sort_parity_stripes(bbio, num_stripes);
tgtdev_indexes = 0;
if (dev_replace_is_ongoing && op == BTRFS_MAP_WRITE &&
dev_replace->tgtdev != NULL) {
int index_where_to_add;
u64 srcdev_devid = dev_replace->srcdev->devid;
/*
* duplicate the write operations while the dev replace
* procedure is running. Since the copying of the old disk
* to the new disk takes place at run time while the
* filesystem is mounted writable, the regular write
* operations to the old disk have to be duplicated to go
* to the new disk as well.
* Note that device->missing is handled by the caller, and
* that the write to the old disk is already set up in the
* stripes array.
*/
index_where_to_add = num_stripes;
for (i = 0; i < num_stripes; i++) {
if (bbio->stripes[i].dev->devid == srcdev_devid) {
/* write to new disk, too */
struct btrfs_bio_stripe *new =
bbio->stripes + index_where_to_add;
struct btrfs_bio_stripe *old =
bbio->stripes + i;
new->physical = old->physical;
new->length = old->length;
new->dev = dev_replace->tgtdev;
bbio->tgtdev_map[i] = index_where_to_add;
index_where_to_add++;
max_errors++;
tgtdev_indexes++;
}
}
num_stripes = index_where_to_add;
} else if (dev_replace_is_ongoing &&
op == BTRFS_MAP_GET_READ_MIRRORS &&
dev_replace->tgtdev != NULL) {
u64 srcdev_devid = dev_replace->srcdev->devid;
int index_srcdev = 0;
int found = 0;
u64 physical_of_found = 0;
/*
* During the dev-replace procedure, the target drive can
* also be used to read data in case it is needed to repair
* a corrupt block elsewhere. This is possible if the
* requested area is left of the left cursor. In this area,
* the target drive is a full copy of the source drive.
*/
for (i = 0; i < num_stripes; i++) {
if (bbio->stripes[i].dev->devid == srcdev_devid) {
/*
* In case of DUP, in order to keep it
* simple, only add the mirror with the
* lowest physical address
*/
if (found &&
physical_of_found <=
bbio->stripes[i].physical)
continue;
index_srcdev = i;
found = 1;
physical_of_found = bbio->stripes[i].physical;
}
}
if (found) {
struct btrfs_bio_stripe *tgtdev_stripe =
bbio->stripes + num_stripes;
tgtdev_stripe->physical = physical_of_found;
tgtdev_stripe->length =
bbio->stripes[index_srcdev].length;
tgtdev_stripe->dev = dev_replace->tgtdev;
bbio->tgtdev_map[index_srcdev] = num_stripes;
tgtdev_indexes++;
num_stripes++;
}
if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL &&
(op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS)) {
handle_ops_on_dev_replace(op, &bbio, dev_replace, &num_stripes,
&max_errors);
}
*bbio_ret = bbio;
@ -5899,7 +5917,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
bbio->num_stripes = num_stripes;
bbio->max_errors = max_errors;
bbio->mirror_num = mirror_num;
bbio->num_tgtdevs = tgtdev_indexes;
/*
* this is the case that REQ_READ && dev_replace_is_ongoing &&