From e38cf302b2e92a870f23e07c4390e04685779340 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Mon, 11 Dec 2017 06:35:22 -0500 Subject: fs: only set S_VERSION when updating times if necessary We only really need to update i_version if someone has queried for it since we last incremented it. By doing that, we can avoid having to update the inode if the times haven't changed. If the times have changed, then we go ahead and forcibly increment the counter, under the assumption that we'll be going to the storage anyway, and the increment itself is relatively cheap. Signed-off-by: Jeff Layton Reviewed-by: Jan Kara --- fs/inode.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'fs/inode.c') diff --git a/fs/inode.c b/fs/inode.c index 19e72f500f71..e2ca0f4b5151 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -1635,17 +1635,21 @@ static int relatime_need_update(const struct path *path, struct inode *inode, int generic_update_time(struct inode *inode, struct timespec *time, int flags) { int iflags = I_DIRTY_TIME; + bool dirty = false; if (flags & S_ATIME) inode->i_atime = *time; if (flags & S_VERSION) - inode_inc_iversion(inode); + dirty = inode_maybe_inc_iversion(inode, false); if (flags & S_CTIME) inode->i_ctime = *time; if (flags & S_MTIME) inode->i_mtime = *time; + if ((flags & (S_ATIME | S_CTIME | S_MTIME)) && + !(inode->i_sb->s_flags & SB_LAZYTIME)) + dirty = true; - if (!(inode->i_sb->s_flags & SB_LAZYTIME) || (flags & S_VERSION)) + if (dirty) iflags |= I_DIRTY_SYNC; __mark_inode_dirty(inode, iflags); return 0; @@ -1864,7 +1868,7 @@ int file_update_time(struct file *file) if (!timespec_equal(&inode->i_ctime, &now)) sync_it |= S_CTIME; - if (IS_I_VERSION(inode)) + if (IS_I_VERSION(inode) && inode_iversion_need_inc(inode)) sync_it |= S_VERSION; if (!sync_it) -- cgit v1.2.3-59-g8ed1b