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Merge branch 'fix/waitqueue-barriers' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux into for-linus-4.4

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This commit is contained in:
Chris Mason
2015-10-12 16:24:40 -07:00
parent 62fb50ab7c ee86395458
commit 6db4a7335d
12 changed files with 62 additions and 7 deletions
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3
fs/btrfs/inode.c
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@@ -1096,6 +1096,9 @@ static noinline void async_cow_submit(struct btrfs_work *work)
nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >>
PAGE_CACHE_SHIFT;
/*
* atomic_sub_return implies a barrier for waitqueue_active
*/
if (atomic_sub_return(nr_pages, &root->fs_info->async_delalloc_pages) <
5 * 1024 * 1024 &&
waitqueue_active(&root->fs_info->async_submit_wait))