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btrfs: scrub: remove btrfs_fs_info::scrub_wr_completion_workers 

Since the scrub rework introduced by commit 2af2aaf982 ("btrfs:
scrub: introduce structure for new BTRFS_STRIPE_LEN based interface")
and later commits, scrub only needs one single workqueue,
fs_info::scrub_worker.

That scrub_wr_completion_workers is initially to handle the delay work
after write bios finished.  But the new scrub code goes submit-and-wait
for write bios, thus all the work are done inside the scrub_worker.

The last user of fs_info::scrub_wr_completion_workers is removed in
commit 16f9399349 ("btrfs: scrub: remove the old writeback
infrastructure"), so we can safely remove the workqueue.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2023-06-12 15:23:29 +08:00 committed by David Sterba
parent c2bbc0bab0
commit 81db6ae842
2 changed files with 2 additions and 18 deletions
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1
fs/btrfs/fs.h
View File

@ -642,7 +642,6 @@ struct btrfs_fs_info {
*/
refcount_t scrub_workers_refcnt;
struct workqueue_struct *scrub_workers;
struct workqueue_struct *scrub_wr_completion_workers;
struct btrfs_subpage_info *subpage_info;
struct btrfs_discard_ctl discard_ctl;

19
fs/btrfs/scrub.c
View File

@ -2698,17 +2698,12 @@ static void scrub_workers_put(struct btrfs_fs_info *fs_info)
if (refcount_dec_and_mutex_lock(&fs_info->scrub_workers_refcnt,
&fs_info->scrub_lock)) {
struct workqueue_struct *scrub_workers = fs_info->scrub_workers;
struct workqueue_struct *scrub_wr_comp =
fs_info->scrub_wr_completion_workers;
fs_info->scrub_workers = NULL;
fs_info->scrub_wr_completion_workers = NULL;
mutex_unlock(&fs_info->scrub_lock);
if (scrub_workers)
destroy_workqueue(scrub_workers);
if (scrub_wr_comp)
destroy_workqueue(scrub_wr_comp);
}
}
@ -2719,7 +2714,6 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
int is_dev_replace)
{
struct workqueue_struct *scrub_workers = NULL;
struct workqueue_struct *scrub_wr_comp = NULL;
unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND;
int max_active = fs_info->thread_pool_size;
int ret = -ENOMEM;
@ -2732,18 +2726,12 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
else
scrub_workers = alloc_workqueue("btrfs-scrub", flags, max_active);
if (!scrub_workers)
goto fail_scrub_workers;
scrub_wr_comp = alloc_workqueue("btrfs-scrubwrc", flags, max_active);
if (!scrub_wr_comp)
goto fail_scrub_wr_completion_workers;
return -ENOMEM;
mutex_lock(&fs_info->scrub_lock);
if (refcount_read(&fs_info->scrub_workers_refcnt) == 0) {
ASSERT(fs_info->scrub_workers == NULL &&
fs_info->scrub_wr_completion_workers == NULL);
ASSERT(fs_info->scrub_workers == NULL);
fs_info->scrub_workers = scrub_workers;
fs_info->scrub_wr_completion_workers = scrub_wr_comp;
refcount_set(&fs_info->scrub_workers_refcnt, 1);
mutex_unlock(&fs_info->scrub_lock);
return 0;
@ -2754,10 +2742,7 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
ret = 0;
destroy_workqueue(scrub_wr_comp);
fail_scrub_wr_completion_workers:
destroy_workqueue(scrub_workers);
fail_scrub_workers:
return ret;
}