This is a note to let you know that I've just added the patch titled
fs/dcache: Re-use value stored to dentry->d_flags instead of re-reading
to the 6.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-dcache-re-use-value-stored-to-dentry-d_flags-inst.patch
and it can be found in the queue-6.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 72c979fe95179e528834031562234e7a9ee690c1
Author: linke li <lilinke99@xxxxxx>
Date: Wed Apr 3 10:10:08 2024 +0800
fs/dcache: Re-use value stored to dentry->d_flags instead of re-reading
[ Upstream commit 8bfb40be31ddea0cb4664b352e1797cfe6c91976 ]
Currently, the __d_clear_type_and_inode() writes the value flags to
dentry->d_flags, then immediately re-reads it in order to use it in a if
statement. This re-read is useless because no other update to
dentry->d_flags can occur at this point.
This commit therefore re-use flags in the if statement instead of
re-reading dentry->d_flags.
Signed-off-by: linke li <lilinke99@xxxxxx>
Link: https://lore.kernel.org/r/tencent_5E187BD0A61BA28605E85405F15228254D0A@xxxxxx
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Stable-dep-of: aabfe57ebaa7 ("vfs: don't mod negative dentry count when on shrinker list")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/dcache.c b/fs/dcache.c
index 71a8e943a0fa5..407095188f83a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -355,7 +355,7 @@ static inline void __d_clear_type_and_inode(struct dentry *dentry)
flags &= ~DCACHE_ENTRY_TYPE;
WRITE_ONCE(dentry->d_flags, flags);
dentry->d_inode = NULL;
- if (dentry->d_flags & DCACHE_LRU_LIST)
+ if (flags & DCACHE_LRU_LIST)
this_cpu_inc(nr_dentry_negative);
}
