From: Zhang Qilong zhangqilong3@huawei.com
[ Upstream commit 07725adc55c0a414c10acb5c8c86cea34b95ddef ]
The following scenarios exist. process A: process B: ->f2fs_drop_extent_tree ->f2fs_update_extent_cache_range ->f2fs_update_extent_tree_range ->write_lock ->set_inode_flag ->is_inode_flag_set ->__free_extent_tree // Shouldn't // have been // cleaned up // here ->write_lock
In this case, the "FI_NO_EXTENT" flag is set between f2fs_update_extent_tree_range and is_inode_flag_set by other process. it leads to clearing the whole exten tree which should not have happened. And we fix it by move the setting it to the range of write_lock.
Fixes:5f281fab9b9a3 ("f2fs: disable extent_cache for fcollapse/finsert inodes") Signed-off-by: Zhang Qilong zhangqilong3@huawei.com Reviewed-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/extent_cache.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c index a70cd2580eae..36d6b561b524 100644 --- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -717,9 +717,8 @@ void f2fs_drop_extent_tree(struct inode *inode) if (!f2fs_may_extent_tree(inode)) return;
- set_inode_flag(inode, FI_NO_EXTENT); - write_lock(&et->lock); + set_inode_flag(inode, FI_NO_EXTENT); __free_extent_tree(sbi, et); if (et->largest.len) { et->largest.len = 0;