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| author | Chris Mason <chris.mason@oracle.com> | 2008-06-25 16:01:31 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:03 -0400 |
| commit | 079899c2384023cd8efcd3806680b4f1d2abbd54 (patch) | |
| tree | d5d6d44f92b600f2fd3e5066bdcd5812e58cbf14 /fs/btrfs/extent_io.c | |
| parent | e7a84565bcdb239caad29ccbe559ef978090ac7e (diff) | |
| download | linux-079899c2384023cd8efcd3806680b4f1d2abbd54.tar.gz | |
Btrfs: Change find_extent_buffer to use TestSetPageLocked
This makes it possible for callers to check for extent_buffers in cache without deadlocking against any btree locks held. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.c')
| -rw-r--r-- | fs/btrfs/extent_io.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index bd15cdcaba95..40a5f53cb040 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2808,10 +2808,15 @@ struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, goto lru_add; for (i = 0; i < num_pages; i++, index++) { - p = find_lock_page(mapping, index); + p = find_get_page(mapping, index); if (!p) { goto fail; } + if (TestSetPageLocked(p)) { + page_cache_release(p); + goto fail; + } + set_page_extent_mapped(p); mark_page_accessed(p); |