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btrfs: get rid of endio_repair_workers

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This was originally added in commit 8b110e393c ("Btrfs: implement
repair function when direct read fails") to avoid a deadlock. In that
commit, the direct I/O read endio executes on the endio_workers
workqueue, submits a repair bio, and waits for it to complete. The
repair bio endio must execute on a different workqueue, otherwise it
could block on the endio_workers workqueue becoming available, which
won't happen because the original endio is blocked on the repair bio.

As of the previous commit, the original endio doesn't wait for the
repair bio, so this separate workqueue is unnecessary.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Omar Sandoval 2020-04-16 14:46:24 -07:00 committed by David Sterba
parent fd9d6670ed
commit 5c047a699a
4 changed files with 2 additions and 10 deletions
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1
fs/btrfs/ctree.h
View File

@ -758,7 +758,6 @@ struct btrfs_fs_info {
struct btrfs_workqueue *endio_workers;
struct btrfs_workqueue *endio_meta_workers;
struct btrfs_workqueue *endio_raid56_workers;
struct btrfs_workqueue *endio_repair_workers;
struct btrfs_workqueue *rmw_workers;
struct btrfs_workqueue *endio_meta_write_workers;
struct btrfs_workqueue *endio_write_workers;

8
fs/btrfs/disk-io.c
View File

@ -709,9 +709,7 @@ static void end_workqueue_bio(struct bio *bio)
else
wq = fs_info->endio_write_workers;
} else {
if (unlikely(end_io_wq->metadata == BTRFS_WQ_ENDIO_DIO_REPAIR))
wq = fs_info->endio_repair_workers;
else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
wq = fs_info->endio_raid56_workers;
else if (end_io_wq->metadata)
wq = fs_info->endio_meta_workers;
@ -1942,7 +1940,6 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
btrfs_destroy_workqueue(fs_info->workers);
btrfs_destroy_workqueue(fs_info->endio_workers);
btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
btrfs_destroy_workqueue(fs_info->endio_repair_workers);
btrfs_destroy_workqueue(fs_info->rmw_workers);
btrfs_destroy_workqueue(fs_info->endio_write_workers);
btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
@ -2145,8 +2142,6 @@ static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
fs_info->endio_raid56_workers =
btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
max_active, 4);
fs_info->endio_repair_workers =
btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0);
fs_info->rmw_workers =
btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
fs_info->endio_write_workers =
@ -2170,7 +2165,6 @@ static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
fs_info->flush_workers &&
fs_info->endio_workers && fs_info->endio_meta_workers &&
fs_info->endio_meta_write_workers &&
fs_info->endio_repair_workers &&
fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
fs_info->endio_freespace_worker && fs_info->rmw_workers &&
fs_info->caching_workers && fs_info->readahead_workers &&

1
fs/btrfs/disk-io.h
View File

@ -25,7 +25,6 @@ enum btrfs_wq_endio_type {
BTRFS_WQ_ENDIO_METADATA,
BTRFS_WQ_ENDIO_FREE_SPACE,
BTRFS_WQ_ENDIO_RAID56,
BTRFS_WQ_ENDIO_DIO_REPAIR,
};
static inline u64 btrfs_sb_offset(int mirror)

2
fs/btrfs/inode.c
View File

@ -7388,7 +7388,7 @@ static inline blk_status_t submit_dio_repair_bio(struct inode *inode,
BUG_ON(bio_op(bio) == REQ_OP_WRITE);
ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DIO_REPAIR);
ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DATA);
if (ret)
return ret;