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Hallyn" , Stephen Smalley , Eric Paris , Kent Overstreet , Brian Foster Date: Wed, 4 Oct 2023 14:55:30 -0400 Message-ID: <20231004185530.82088-3-jlayton@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231004185530.82088-1-jlayton@kernel.org> References: <20231004185530.82088-1-jlayton@kernel.org> MIME-Version: 1.0 X-Headers-End: 1qo72m-001lYI-Mr Subject: [f2fs-dev] [PATCH v2 89/89] fs: move i_generation into new hole created after timestamp conversion X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jfs-discussion@lists.sourceforge.net, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, gfs2@lists.linux.dev, linux-mm@kvack.org, linux-mtd@lists.infradead.org, linux-hardening@vger.kernel.org, linux-afs@lists.infradead.org, linux-s390@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-rdma@vger.kernel.org, linux-unionfs@vger.kernel.org, codalist@coda.cs.cmu.edu, linux-bcachefs@vger.kernel.org, linux-serial@vger.kernel.org, linux-ext4@vger.kernel.org, devel@lists.orangefs.org, linux-trace-kernel@vger.kernel.org, linux-cifs@vger.kernel.org, selinux@vger.kernel.org, apparmor@lists.ubuntu.com, autofs@vger.kernel.org, linux-um@lists.infradead.org, reiserfs-devel@vger.kernel.org, ocfs2-devel@lists.linux.dev, ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-ntfs-dev@lists.sourceforge.net, linuxppc-dev@lists.ozlabs.org, v9fs@lists.linux.dev, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, linux-security-module@vger.kernel.org, netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, bpf@vger.kernel.org, ntfs3@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-karma-devel@lists.sourceforge.net, linux-btrfs@vger.kernel.org Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net The recent change to use discrete integers instead of struct timespec64 shaved 8 bytes off of struct inode, but it also moves the i_lock into the previous cacheline, away from the fields that it protects. Move i_generation above the i_lock, which moves the new 4 byte hole to just after the i_fsnotify_mask in my setup. Suggested-by: Amir Goldstein Signed-off-by: Jeff Layton --- 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 485b5e21c8e5..686c9f33e725 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -677,6 +677,7 @@ struct inode { u32 i_atime_nsec; u32 i_mtime_nsec; u32 i_ctime_nsec; + u32 i_generation; spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ unsigned short i_bytes; u8 i_blkbits; @@ -733,7 +734,6 @@ struct inode { unsigned i_dir_seq; }; - __u32 i_generation; #ifdef CONFIG_FSNOTIFY __u32 i_fsnotify_mask; /* all events this inode cares about */