[PATCH v2 3/3] xfs: mark the inode for high-res timestamp update in getattr

[Jeff Layton]

When the mtime or ctime is being queried via getattr, ensure that we
mark the inode for a high-res timestamp update on the next pass. Also,
switch to current_cmtime for other c/mtime updates.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_trans_inode.c | 2 +-
 fs/xfs/xfs_acl.c                | 2 +-
 fs/xfs/xfs_inode.c              | 2 +-
 fs/xfs/xfs_inode_item.c         | 2 +-
 fs/xfs/xfs_iops.c               | 9 ++++++---
 fs/xfs/xfs_super.c              | 5 ++++-
 6 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_inode.c
index 8b5547073379..c08be3aa3339 100644
--- a/fs/xfs/libxfs/xfs_trans_inode.c
+++ b/fs/xfs/libxfs/xfs_trans_inode.c
@@ -63,7 +63,7 @@ xfs_trans_ichgtime(
 	ASSERT(tp);
 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 
-	tv = current_time(inode);
+	tv = current_ctime(inode);
 
 	if (flags & XFS_ICHGTIME_MOD)
 		inode->i_mtime = tv;
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index 791db7d9c849..85353e6e9004 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -233,7 +233,7 @@ xfs_acl_set_mode(
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
 	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 	inode->i_mode = mode;
-	inode->i_ctime = current_time(inode);
+	inode->i_ctime = current_ctime(inode);
 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 
 	if (xfs_has_wsync(mp))
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 5808abab786c..ac299c1a9838 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -843,7 +843,7 @@ xfs_init_new_inode(
 	ip->i_df.if_nextents = 0;
 	ASSERT(ip->i_nblocks == 0);
 
-	tv = current_time(inode);
+	tv = current_ctime(inode);
 	inode->i_mtime = tv;
 	inode->i_atime = tv;
 	inode->i_ctime = tv;
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index ca2941ab6cbc..dc33f495f4fa 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -381,7 +381,7 @@ xfs_inode_to_log_dinode(
 	memset(to->di_pad3, 0, sizeof(to->di_pad3));
 	to->di_atime = xfs_inode_to_log_dinode_ts(ip, inode->i_atime);
 	to->di_mtime = xfs_inode_to_log_dinode_ts(ip, inode->i_mtime);
-	to->di_ctime = xfs_inode_to_log_dinode_ts(ip, inode->i_ctime);
+	to->di_ctime = xfs_inode_to_log_dinode_ts(ip, timestamp_truncate(inode->i_ctime, inode));
 	to->di_nlink = inode->i_nlink;
 	to->di_gen = inode->i_generation;
 	to->di_mode = inode->i_mode;
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 24718adb3c16..b0490e46e825 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -573,8 +573,11 @@ xfs_vn_getattr(
 	stat->gid = vfsgid_into_kgid(vfsgid);
 	stat->ino = ip->i_ino;
 	stat->atime = inode->i_atime;
-	stat->mtime = inode->i_mtime;
-	stat->ctime = inode->i_ctime;
+	if (request_mask & (STATX_MTIME|STATX_CTIME))
+		generic_fill_multigrain_cmtime(inode, stat);
+	else
+		stat->result_mask &= ~(STATX_CTIME|STATX_MTIME);
+
 	stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
 
 	if (xfs_has_v3inodes(mp)) {
@@ -917,7 +920,7 @@ xfs_setattr_size(
 	if (newsize != oldsize &&
 	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
 		iattr->ia_ctime = iattr->ia_mtime =
-			current_time(inode);
+			current_ctime(inode);
 		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 	}
 
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 4f814f9e12ab..ee9d0b43bf15 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1620,7 +1620,7 @@ xfs_fs_fill_super(
 	sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	sb->s_max_links = XFS_MAXLINK;
-	sb->s_time_gran = 1;
+	sb->s_time_gran = 2;
 	if (xfs_has_bigtime(mp)) {
 		sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
 		sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
@@ -1633,6 +1633,9 @@ xfs_fs_fill_super(
 
 	set_posix_acl_flag(sb);
 
+	/* Enable multigrain timestamps */
+	sb->s_flags |= SB_MULTIGRAIN_TS;
+
 	/* version 5 superblocks support inode version counters. */
 	if (xfs_has_crc(mp))
 		sb->s_flags |= SB_I_VERSION;
-- 
2.40.0