[PATCH v3 4/8] nfsd: use ATTR_CTIME_SET for delegated ctime updates

[Jeff Layton]

Ensure that notify_change() doesn't clobber a delegated ctime update
with current_time() by setting ATTR_CTIME_SET for those updates.

Don't bother setting the timestamps in cb_getattr_update_times() in the
non-delegated case. notify_change() will do that itself.

Fixes: 7e13f4f8d27d ("nfsd: handle delegated timestamps in SETATTR")
Signed-off-by: Jeff Layton <jlay...@kernel.org>
---
 fs/nfsd/nfs4state.c | 6 +++---
 fs/nfsd/nfs4xdr.c   | 3 ++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 
88c347957da5b8f352be63f84f207d2225f81cb9..77eea2ad93cc07939f045fc4b983b1ac00d068b8
 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -9167,7 +9167,6 @@ static bool set_cb_time(struct timespec64 *cb, const 
struct timespec64 *orig,
 static int cb_getattr_update_times(struct dentry *dentry, struct 
nfs4_delegation *dp)
 {
        struct inode *inode = d_inode(dentry);
-       struct timespec64 now = current_time(inode);
        struct nfs4_cb_fattr *ncf = &dp->dl_cb_fattr;
        struct iattr attrs = { };
        int ret;
@@ -9175,6 +9174,7 @@ static int cb_getattr_update_times(struct dentry *dentry, 
struct nfs4_delegation
        if (deleg_attrs_deleg(dp->dl_type)) {
                struct timespec64 atime = inode_get_atime(inode);
                struct timespec64 mtime = inode_get_mtime(inode);
+               struct timespec64 now = current_time(inode);
 
                attrs.ia_atime = ncf->ncf_cb_atime;
                attrs.ia_mtime = ncf->ncf_cb_mtime;
@@ -9183,12 +9183,12 @@ static int cb_getattr_update_times(struct dentry 
*dentry, struct nfs4_delegation
                        attrs.ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 
                if (set_cb_time(&attrs.ia_mtime, &mtime, &now)) {
-                       attrs.ia_valid |= ATTR_CTIME | ATTR_MTIME | 
ATTR_MTIME_SET;
+                       attrs.ia_valid |= ATTR_CTIME | ATTR_CTIME_SET |
+                                         ATTR_MTIME | ATTR_MTIME_SET;
                        attrs.ia_ctime = attrs.ia_mtime;
                }
        } else {
                attrs.ia_valid |= ATTR_MTIME | ATTR_CTIME;
-               attrs.ia_mtime = attrs.ia_ctime = now;
        }
 
        if (!attrs.ia_valid)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 
52033e2d603eb545dda781df5458da7d9805a373..c0a3c6a7c8bb70d62940115c3101e9f897401456
 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -539,7 +539,8 @@ nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 
*bmval, u32 bmlen,
                iattr->ia_mtime.tv_nsec = modify.nseconds;
                iattr->ia_ctime.tv_sec = modify.seconds;
                iattr->ia_ctime.tv_nsec = modify.nseconds;
-               iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME | ATTR_MTIME_SET | 
ATTR_DELEG;
+               iattr->ia_valid |= ATTR_CTIME | ATTR_CTIME_SET |
+                                  ATTR_MTIME | ATTR_MTIME_SET | ATTR_DELEG;
        }
 
        /* request sanity: did attrlist4 contain the expected number of words? 
*/

-- 
2.50.1