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Btrfs: Add extra checks to avoid removing extent_state from pages we can't free

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-11 10:51:07 -04:00
parent f29844623d
commit 3dd39914bc
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/disk-io.c
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@ -436,6 +436,12 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags)
struct extent_map_tree *map; struct extent_map_tree *map;
int ret; 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; tree = &BTRFS_I(page->mapping->host)->io_tree;
map = &BTRFS_I(page->mapping->host)->extent_tree; map = &BTRFS_I(page->mapping->host)->extent_tree;
ret = try_release_extent_mapping(map, tree, page, gfp_flags); ret = try_release_extent_mapping(map, tree, page, gfp_flags);