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| author | Chris Mason <chris.mason@oracle.com> | 2008-04-11 10:51:07 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:01 -0400 |
| commit | 3dd39914bc0737d055c780d29c20a1d117819cdb (patch) | |
| tree | d7d65e3f3d929310130316051d16e5c52906283b /fs/btrfs/disk-io.c | |
| parent | f29844623de29a12358d7fba35d0959465b64adf (diff) | |
| download | lwn-3dd39914bc0737d055c780d29c20a1d117819cdb.tar.gz lwn-3dd39914bc0737d055c780d29c20a1d117819cdb.zip | |
Btrfs: Add extra checks to avoid removing extent_state from pages we can't free
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index cf1de75f088a..e22960e23501 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -436,6 +436,12 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags) struct extent_map_tree *map; int ret; + if (page_count(page) > 3) { + /* once for page->private, once for the caller, once + * once for the page cache + */ + return 0; + } tree = &BTRFS_I(page->mapping->host)->io_tree; map = &BTRFS_I(page->mapping->host)->extent_tree; ret = try_release_extent_mapping(map, tree, page, gfp_flags); |