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btrfs: add error handling for scrub_workers_get()

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Although it is a rare case, we'd better free previous allocated
memory on error.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Zhao Lei 2015-06-12 20:36:58 +08:00 committed by Chris Mason
parent 65f5333875
commit e82afc52ab
1 changed files with 20 additions and 19 deletions
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39
fs/btrfs/scrub.c
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@ -3571,7 +3571,6 @@ static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
int is_dev_replace)
{
int ret = 0;
unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND;
int max_active = fs_info->thread_pool_size;
@ -3584,34 +3583,36 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
fs_info->scrub_workers =
btrfs_alloc_workqueue("btrfs-scrub", flags,
max_active, 4);
if (!fs_info->scrub_workers) {
ret = -ENOMEM;
goto out;
}
if (!fs_info->scrub_workers)
goto fail_scrub_workers;
fs_info->scrub_wr_completion_workers =
btrfs_alloc_workqueue("btrfs-scrubwrc", flags,
max_active, 2);
if (!fs_info->scrub_wr_completion_workers) {
ret = -ENOMEM;
goto out;
}
if (!fs_info->scrub_wr_completion_workers)
goto fail_scrub_wr_completion_workers;
fs_info->scrub_nocow_workers =
btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0);
if (!fs_info->scrub_nocow_workers) {
ret = -ENOMEM;
goto out;
}
if (!fs_info->scrub_nocow_workers)
goto fail_scrub_nocow_workers;
fs_info->scrub_parity_workers =
btrfs_alloc_workqueue("btrfs-scrubparity", flags,
max_active, 2);
if (!fs_info->scrub_parity_workers) {
ret = -ENOMEM;
goto out;
}
if (!fs_info->scrub_parity_workers)
goto fail_scrub_parity_workers;
}
++fs_info->scrub_workers_refcnt;
out:
return ret;
return 0;
fail_scrub_parity_workers:
btrfs_destroy_workqueue(fs_info->scrub_nocow_workers);
fail_scrub_nocow_workers:
btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers);
fail_scrub_wr_completion_workers:
btrfs_destroy_workqueue(fs_info->scrub_workers);
fail_scrub_workers:
return -ENOMEM;
}
static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info)