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btrfs: switch extent_buffer blocking_writers from atomic to int

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The blocking_writers is either 0 or 1 and always updated under the lock,
so we don't need the atomic_t semantics.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2019-05-02 16:47:23 +02:00
parent 38e9372e39
commit 06297d8cef
4 changed files with 23 additions and 29 deletions
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2
fs/btrfs/extent_io.c
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@@ -4857,7 +4857,7 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
eb->bflags = 0;
rwlock_init(&eb->lock);
atomic_set(&eb->blocking_readers, 0);
atomic_set(&eb->blocking_writers, 0);
eb->blocking_writers = 0;
eb->lock_nested = false;
init_waitqueue_head(&eb->write_lock_wq);
init_waitqueue_head(&eb->read_lock_wq);