[PATCH v4 18/19] btrfs: only dirty the inode in btrfs_update_time if something was changed
From: Jeff Layton <jlayton@kernel.org>
Date: 2017-12-22 12:05:55
Also in:
linux-btrfs, linux-ext4, linux-fsdevel, linux-nfs, linux-xfs, lkml
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
From: Jeff Layton <redacted> At this point, we know that "now" and the file times may differ, and we suspect that the i_version has been flagged to be bumped. Attempt to bump the i_version, and only mark the inode dirty if that actually occurred or if one of the times was updated. Signed-off-by: Jeff Layton <redacted> --- fs/btrfs/inode.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ac8692849a81..76245323a7c8 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c@@ -6107,19 +6107,20 @@ static int btrfs_update_time(struct inode *inode, struct timespec *now, int flags) { struct btrfs_root *root = BTRFS_I(inode)->root; + bool dirty = flags & ~S_VERSION; if (btrfs_root_readonly(root)) return -EROFS; if (flags & S_VERSION) - inode_inc_iversion(inode); + dirty |= inode_maybe_inc_iversion(inode, dirty); if (flags & S_CTIME) inode->i_ctime = *now; if (flags & S_MTIME) inode->i_mtime = *now; if (flags & S_ATIME) inode->i_atime = *now; - return btrfs_dirty_inode(inode); + return dirty ? btrfs_dirty_inode(inode) : 0; } /*
--
2.14.3