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authorJaegeuk Kim <jaegeuk@kernel.org>2015-12-01 01:26:44 +0100
committerJaegeuk Kim <jaegeuk@kernel.org>2015-12-04 20:52:36 +0100
commit760de7914e27781abb44564449c761ea4440f982 (patch)
treed836230fe63ec680631c681f821c8a41d84dbe6b /fs/f2fs/extent_cache.c
parentf2fs: fix to report error in f2fs_readdir (diff)
downloadlinux-760de7914e27781abb44564449c761ea4440f982.tar.xz
linux-760de7914e27781abb44564449c761ea4440f982.zip
f2fs: avoid deadlock in f2fs_shrink_extent_tree
While handling extent trees, we can enter into a reclaiming path anytime. If it tries to release some extent nodes in the same extent tree, write_lock(&et->lock) would be hanged. In order to avoid the deadlock, we can just skip it. Note that, if it is an unreferenced tree, we should get write_lock(&et->lock) successfully and release all of therein nodes. Reviewed-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/extent_cache.c')
-rw-r--r--fs/f2fs/extent_cache.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 7ddba812e11b..de063f2b2384 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -615,9 +615,10 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
for (i = 0; i < found; i++) {
struct extent_tree *et = treevec[i];
- write_lock(&et->lock);
- node_cnt += __free_extent_tree(sbi, et, false);
- write_unlock(&et->lock);
+ if (write_trylock(&et->lock)) {
+ node_cnt += __free_extent_tree(sbi, et, false);
+ write_unlock(&et->lock);
+ }
if (node_cnt + tree_cnt >= nr_shrink)
goto unlock_out;