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btrfs: zoned: factor out zoned device lookup 

To be able to construct a zone append bio we need to look up the
btrfs_device. The code doing the chunk map lookup to get the device is
present in btrfs_submit_compressed_write and submit_extent_page.

Factor out the lookup calls into a helper and use it in the submission
paths.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2021-05-19 00:40:29 +09:00 committed by David Sterba
parent 50535db8fb
commit e7ff9e6b8e
4 changed files with 39 additions and 23 deletions
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16
fs/btrfs/compression.c
View File

@ -427,24 +427,16 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
bio->bi_end_io = end_compressed_bio_write;
if (use_append) {
struct extent_map *em;
struct map_lookup *map;
struct block_device *bdev;
struct btrfs_device *device;
em = btrfs_get_chunk_map(fs_info, disk_start, PAGE_SIZE);
if (IS_ERR(em)) {
device = btrfs_zoned_get_device(fs_info, disk_start, PAGE_SIZE);
if (IS_ERR(device)) {
kfree(cb);
bio_put(bio);
return BLK_STS_NOTSUPP;
}
map = em->map_lookup;
/* We only support single profile for now */
ASSERT(map->num_stripes == 1);
bdev = map->stripes[0].dev->bdev;
bio_set_dev(bio, bdev);
free_extent_map(em);
bio_set_dev(bio, device->bdev);
}
if (blkcg_css) {

16
fs/btrfs/extent_io.c
View File

@ -3266,19 +3266,13 @@ static int submit_extent_page(unsigned int opf,
wbc_account_cgroup_owner(wbc, page, io_size);
}
if (btrfs_is_zoned(fs_info) && bio_op(bio) == REQ_OP_ZONE_APPEND) {
struct extent_map *em;
struct map_lookup *map;
struct btrfs_device *device;
em = btrfs_get_chunk_map(fs_info, disk_bytenr, io_size);
if (IS_ERR(em))
return PTR_ERR(em);
device = btrfs_zoned_get_device(fs_info, disk_bytenr, io_size);
if (IS_ERR(device))
return PTR_ERR(device);
map = em->map_lookup;
/* We only support single profile for now */
ASSERT(map->num_stripes == 1);
btrfs_io_bio(bio)->device = map->stripes[0].dev;
free_extent_map(em);
btrfs_io_bio(bio)->device = device;
}
*bio_ret = bio;

21
fs/btrfs/zoned.c
View File

@ -1533,3 +1533,24 @@ int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
length = wp - physical_pos;
return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);
}
struct btrfs_device *btrfs_zoned_get_device(struct btrfs_fs_info *fs_info,
u64 logical, u64 length)
{
struct btrfs_device *device;
struct extent_map *em;
struct map_lookup *map;
em = btrfs_get_chunk_map(fs_info, logical, length);
if (IS_ERR(em))
return ERR_CAST(em);
map = em->map_lookup;
/* We only support single profile for now */
ASSERT(map->num_stripes == 1);
device = map->stripes[0].dev;
free_extent_map(em);
return device;
}

9
fs/btrfs/zoned.h
View File

@ -65,6 +65,8 @@ void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length);
int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
u64 physical_start, u64 physical_pos);
struct btrfs_device *btrfs_zoned_get_device(struct btrfs_fs_info *fs_info,
u64 logical, u64 length);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
@ -191,6 +193,13 @@ static inline int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev,
return -EOPNOTSUPP;
}
static inline struct btrfs_device *btrfs_zoned_get_device(
struct btrfs_fs_info *fs_info,
u64 logical, u64 length)
{
return ERR_PTR(-EOPNOTSUPP);
}
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)