[PATCH] knfsd: check error status from vfs_getattr and i_op->fsync

Both vfs_getattr and i_op->fsync return error statuses which nfsd was
largely ignoring.  This as noticed when exporting directories using fuse.

This patch cleans up most of the offences, which involves moving the call
to vfs_getattr out of the xdr encoding routines (where it is too late to
report an error) into the main NFS procedure handling routines.

There is still a called to vfs_gettattr (related to the ACL code) where the
status is ignored, and called to nfsd_sync_dir don't check return status
either.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 25 insertions, 22 deletions

diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 9147b8524d05..243d94b9653a 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -154,37 +154,34 @@ decode_sattr3(u32 *p, struct iattr *iap)
 }
 
 static inline u32 *
-encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
+encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp,
+              struct kstat *stat)
 {
-        struct vfsmount *mnt = fhp->fh_export->ex_mnt;
         struct dentry   *dentry = fhp->fh_dentry;
-        struct kstat stat;
         struct timespec time;
 
-        vfs_getattr(mnt, dentry, &stat);
-
-        *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]);
-        *p++ = htonl((u32) stat.mode);
-        *p++ = htonl((u32) stat.nlink);
-        *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
-        *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
-        if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) {
+        *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
+        *p++ = htonl((u32) stat->mode);
+        *p++ = htonl((u32) stat->nlink);
+        *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
+        *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
+        if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
         } else {
-                p = xdr_encode_hyper(p, (u64) stat.size);
+                p = xdr_encode_hyper(p, (u64) stat->size);
         }
-        p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9);
-        *p++ = htonl((u32) MAJOR(stat.rdev));
-        *p++ = htonl((u32) MINOR(stat.rdev));
+        p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
+        *p++ = htonl((u32) MAJOR(stat->rdev));
+        *p++ = htonl((u32) MINOR(stat->rdev));
         if (is_fsid(fhp, rqstp->rq_reffh))
                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
         else
-                p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev));
-        p = xdr_encode_hyper(p, (u64) stat.ino);
-        p = encode_time3(p, &stat.atime);
+                p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat->dev));
+        p = xdr_encode_hyper(p, (u64) stat->ino);
+        p = encode_time3(p, &stat->atime);
         lease_get_mtime(dentry->d_inode, &time); 
         p = encode_time3(p, &time);
-        p = encode_time3(p, &stat.ctime);
+        p = encode_time3(p, &stat->ctime);
 
         return p;
 }
@@ -232,8 +229,14 @@ encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
 {
         struct dentry *dentry = fhp->fh_dentry;
         if (dentry && dentry->d_inode != NULL) {
-                *p++ = xdr_one;         /* attributes follow */
-                return encode_fattr3(rqstp, p, fhp);
+                int err;
+                struct kstat stat;
+
+                err = vfs_getattr(fhp->fh_export->ex_mnt, dentry, &stat);
+                if (!err) {
+                        *p++ = xdr_one;         /* attributes follow */
+                        return encode_fattr3(rqstp, p, fhp, &stat);
+                }
         }
         *p++ = xdr_zero;
         return p;
@@ -616,7 +619,7 @@ nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
                                         struct nfsd3_attrstat *resp)
 {
         if (resp->status == 0)
-                p = encode_fattr3(rqstp, p, &resp->fh);
+                p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
         return xdr_ressize_check(rqstp, p);
 }