[PATCH v2] fs: Handle I_DONTCACHE in iput_final() instead of generic_drop_inode()

From: Hao Li
Date: Fri Sep 04 2020 - 03:59:59 EST


If generic_drop_inode() returns true, it means iput_final() can evict
this inode regardless of whether it is dirty or not. If we check
I_DONTCACHE in generic_drop_inode(), any inode with this bit set will be
evicted unconditionally. This is not the desired behavior because
I_DONTCACHE only means the inode shouldn't be cached on the LRU list.
As for whether we need to evict this inode, this is what
generic_drop_inode() should do. This patch corrects the usage of
I_DONTCACHE.

This patch was proposed in [1].

[1]: https://lore.kernel.org/linux-fsdevel/20200831003407.GE12096@xxxxxxxxxxxxxxxxxxx/

Fixes: dae2f8ed7992 ("fs: Lift XFS_IDONTCACHE to the VFS layer")
Signed-off-by: Hao Li <lihao2018.fnst@xxxxxxxxxxxxxx>
---
Changes in v2:
- Adjust code format
- Add Fixes tag in commit message

fs/inode.c | 4 +++-
include/linux/fs.h | 3 +--
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index 72c4c347afb7..19ad823f781c 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1625,7 +1625,9 @@ static void iput_final(struct inode *inode)
else
drop = generic_drop_inode(inode);

- if (!drop && (sb->s_flags & SB_ACTIVE)) {
+ if (!drop &&
+ !(inode->i_state & I_DONTCACHE) &&
+ (sb->s_flags & SB_ACTIVE)) {
inode_add_lru(inode);
spin_unlock(&inode->i_lock);
return;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e019ea2f1347..93caee80ce47 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2922,8 +2922,7 @@ extern int inode_needs_sync(struct inode *inode);
extern int generic_delete_inode(struct inode *inode);
static inline int generic_drop_inode(struct inode *inode)
{
- return !inode->i_nlink || inode_unhashed(inode) ||
- (inode->i_state & I_DONTCACHE);
+ return !inode->i_nlink || inode_unhashed(inode);
}
extern void d_mark_dontcache(struct inode *inode);

--
2.28.0