Commit Message
Greg KH
Oct. 24, 2022, 11:31 a.m. UTC
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 3ebf976a682d..bd16c78b5bf2 100644 --- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -762,9 +762,8 @@ 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;