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btrfs: only dirty the inode in btrfs_update_time if something was changed 

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 <jlayton@redhat.com>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
This commit is contained in:
Jeff Layton 2017-12-11 06:35:24 -05:00
parent d17260fd5f
commit 3a8c7231d5
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/inode.c
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@ -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;
}
/*