[RFC PATCH 4/4] ceph: fill in the change attribute in statx requests

[Jeff Layton]

When statx requests the change attribute, request the full gamut of caps
(similarly to how ctime is handled). When the change attribute seems to
be valid, return it in the chgattr field.

Signed-off-by: Jeff Layton <jlayton at kernel.org>
---
 fs/ceph/inode.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 56c53ab3618e..fb2ed85f9083 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2408,10 +2408,10 @@ static int statx_to_caps(u32 want, umode_t mode)
 {
 	int mask = 0;
 
-	if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
+	if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHGATTR))
 		mask |= CEPH_CAP_AUTH_SHARED;
 
-	if (want & (STATX_NLINK|STATX_CTIME)) {
+	if (want & (STATX_NLINK|STATX_CTIME|STATX_CHGATTR)) {
 		/*
 		 * The link count for directories depends on inode->i_subdirs,
 		 * and that is only updated when Fs caps are held.
@@ -2422,11 +2422,10 @@ static int statx_to_caps(u32 want, umode_t mode)
 			mask |= CEPH_CAP_LINK_SHARED;
 	}
 
-	if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
-		    STATX_BLOCKS))
+	if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE| STATX_BLOCKS|STATX_CHGATTR))
 		mask |= CEPH_CAP_FILE_SHARED;
 
-	if (want & (STATX_CTIME))
+	if (want & (STATX_CTIME|STATX_CHGATTR))
 		mask |= CEPH_CAP_XATTR_SHARED;
 
 	return mask;
@@ -2468,6 +2467,11 @@ int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
 		valid_mask |= STATX_BTIME;
 	}
 
+	if (request_mask & STATX_CHGATTR) {
+		stat->chgattr = inode_peek_iversion_raw(inode);
+		valid_mask |= STATX_CHGATTR;
+	}
+
 	if (ceph_snap(inode) == CEPH_NOSNAP)
 		stat->dev = inode->i_sb->s_dev;
 	else
-- 
2.37.1