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Btrfs: make sure we retry if we couldn't get the page 

In inode.c:btrfs_page_exists_in_range(), if we can't get the page
we need to retry. However we weren't retrying because we weren't
setting page to NULL, which makes the while loop exit immediately
and will make us call page_cache_release after exiting the loop
which is incorrect because our page get didn't succeed. This could
also make us return true when we shouldn't.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Filipe Manana 2014-06-05 13:22:24 +01:00 committed by Chris Mason
parent c81d57679e
commit 91405151eb
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/inode.c
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@ -6777,8 +6777,10 @@ bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end)
break; /* TODO: Is this relevant for this use case? */
}
if (!page_cache_get_speculative(page))
if (!page_cache_get_speculative(page)) {
page = NULL;
continue;
}
/*
* Has the page moved?