[PATCH v2 1/2] nfsd: encode stat->mtime for getattr instead of inode->i_mtime

[Amir Goldstein <amir73il@gmail.com>]

The values of stat->mtime and inode->i_mtime may differ for overlayfs
and stat->mtime is the correct value to use when encoding getattr.
This is also consistent with the fact that other attr times are also
encoded from stat values.

Both callers of lease_get_mtime() already have the value of stat->mtime,
so the only needed change is that lease_get_mtime() will not overwrite
this value with inode->i_mtime in case the inode does not have an
exclusive lease.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/locks.c       | 6 ++----
 fs/nfsd/nfsxdr.c | 1 +
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 21b4dfa289ee..d6ff4beb70ce 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1554,9 +1554,9 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
 EXPORT_SYMBOL(__break_lease);
 
 /**
- *	lease_get_mtime - get the last modified time of an inode
+ *	lease_get_mtime - update modified time of an inode with exclusive lease
  *	@inode: the inode
- *      @time:  pointer to a timespec which will contain the last modified time
+ *      @time:  pointer to a timespec which contains the last modified time
  *
  * This is to force NFS clients to flush their caches for files with
  * exclusive leases.  The justification is that if someone has an
@@ -1580,8 +1580,6 @@ void lease_get_mtime(struct inode *inode, struct timespec *time)
 
 	if (has_lease)
 		*time = current_time(inode);
-	else
-		*time = inode->i_mtime;
 }
 
 EXPORT_SYMBOL(lease_get_mtime);
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 644a0342f0e0..79b6064f8977 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -188,6 +188,7 @@ encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 	*p++ = htonl((u32) stat->ino);
 	*p++ = htonl((u32) stat->atime.tv_sec);
 	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
+	time = stat->mtime;
 	lease_get_mtime(d_inode(dentry), &time); 
 	*p++ = htonl((u32) time.tv_sec);
 	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); 
-- 
2.7.4