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btrfs: scrub: add assertions for worker pointers 

The scrub worker pointers are not NULL iff the scrub is running, so
reset them back once the last reference is dropped. Add assertions to
the initial phase of scrub to verify that.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-02-12 16:51:18 +01:00
parent ff09c4ca59
commit c835294274
2 changed files with 11 additions and 0 deletions
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4
fs/btrfs/ctree.h
View File

@ -1075,6 +1075,10 @@ struct btrfs_fs_info {
atomic_t scrubs_paused;
atomic_t scrub_cancel_req;
wait_queue_head_t scrub_pause_wait;
/*
* The worker pointers are NULL iff the refcount is 0, ie. scrub is not
* running.
*/
refcount_t scrub_workers_refcnt;
struct btrfs_workqueue *scrub_workers;
struct btrfs_workqueue *scrub_wr_completion_workers;

7
fs/btrfs/scrub.c
View File

@ -3744,17 +3744,20 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
lockdep_assert_held(&fs_info->scrub_lock);
if (refcount_read(&fs_info->scrub_workers_refcnt) == 0) {
ASSERT(fs_info->scrub_workers == NULL);
fs_info->scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub",
flags, is_dev_replace ? 1 : max_active, 4);
if (!fs_info->scrub_workers)
goto fail_scrub_workers;
ASSERT(fs_info->scrub_wr_completion_workers == NULL);
fs_info->scrub_wr_completion_workers =
btrfs_alloc_workqueue(fs_info, "scrubwrc", flags,
max_active, 2);
if (!fs_info->scrub_wr_completion_workers)
goto fail_scrub_wr_completion_workers;
ASSERT(fs_info->scrub_parity_workers == NULL);
fs_info->scrub_parity_workers =
btrfs_alloc_workqueue(fs_info, "scrubparity", flags,
max_active, 2);
@ -3934,6 +3937,10 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
scrub_workers = fs_info->scrub_workers;
scrub_wr_comp = fs_info->scrub_wr_completion_workers;
scrub_parity = fs_info->scrub_parity_workers;
fs_info->scrub_workers = NULL;
fs_info->scrub_wr_completion_workers = NULL;
fs_info->scrub_parity_workers = NULL;
}
mutex_unlock(&fs_info->scrub_lock);