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Open Source and information security mailing list archives
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Date: Thu, 28 Sep 2023 07:05:54 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
David Sterba <dsterba@...e.cz>,
Amir Goldstein <amir73il@...il.com>,
Theodore Ts'o <tytso@....edu>,
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Arnd Bergmann <arnd@...db.de>,
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"Tigran A. Aivazian" <aivazian.tigran@...il.com>,
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Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
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selinux@...r.kernel.org
Subject: [PATCH 87/87] fs: move i_blocks up a few places in struct inode
The recent change to use discrete integers instead of struct timespec64
in struct inode shaved 8 bytes off of it, but it also moves the i_lock
into the previous cacheline, away from the fields that it protects.
Move i_blocks up above the i_lock, which moves the new 4 byte hole to
just after the timestamps, without changing the size of the structure.
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
include/linux/fs.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index de902ff2938b..3e0fe0f52e7c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,11 +677,11 @@ struct inode {
u32 i_atime_nsec;
u32 i_mtime_nsec;
u32 i_ctime_nsec;
+ blkcnt_t i_blocks;
spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
unsigned short i_bytes;
u8 i_blkbits;
u8 i_write_hint;
- blkcnt_t i_blocks;
#ifdef __NEED_I_SIZE_ORDERED
seqcount_t i_size_seqcount;
--
2.41.0
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