NFSD: Refactor nfsd_create_setattr()

I'd like to move do_nfsd_create() out of vfs.c. Therefore
nfsd_create_setattr() needs to be made publicly visible.

Note that both call sites in vfs.c commit both the new object and
its parent directory, so just combine those common metadata commits
into nfsd_create_setattr().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index bbed7a9..83c989a 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1181,14 +1181,26 @@ out:
        return err;
 }
 
-static __be32
-nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
-                       struct iattr *iap)
+/**
+ * nfsd_create_setattr - Set a created file's attributes
+ * @rqstp: RPC transaction being executed
+ * @fhp: NFS filehandle of parent directory
+ * @resfhp: NFS filehandle of new object
+ * @iap: requested attributes of new object
+ *
+ * Returns nfs_ok on success, or an nfsstat in network byte order.
+ */
+__be32
+nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
+                   struct svc_fh *resfhp, struct iattr *iap)
 {
+       __be32 status;
+
        /*
-        * Mode has already been set earlier in create:
+        * Mode has already been set by file creation.
         */
        iap->ia_valid &= ~ATTR_MODE;
+
        /*
         * Setting uid/gid works only for root.  Irix appears to
         * send along the gid on create when it tries to implement
@@ -1196,10 +1208,31 @@ nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
         */
        if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID))
                iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
+
+       /*
+        * Callers expect new file metadata to be committed even
+        * if the attributes have not changed.
+        */
        if (iap->ia_valid)
-               return nfsd_setattr(rqstp, resfhp, iap, 0, (time64_t)0);
-       /* Callers expect file metadata to be committed here */
-       return nfserrno(commit_metadata(resfhp));
+               status = nfsd_setattr(rqstp, resfhp, iap, 0, (time64_t)0);
+       else
+               status = nfserrno(commit_metadata(resfhp));
+
+       /*
+        * Transactional filesystems had a chance to commit changes
+        * for both parent and child simultaneously making the
+        * following commit_metadata a noop in many cases.
+        */
+       if (!status)
+               status = nfserrno(commit_metadata(fhp));
+
+       /*
+        * Update the new filehandle to pick up the new attributes.
+        */
+       if (!status)
+               status = fh_update(resfhp);
+
+       return status;
 }
 
 /* HPUX client sometimes creates a file in mode 000, and sets size to 0.
@@ -1226,7 +1259,6 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
        struct dentry   *dentry, *dchild;
        struct inode    *dirp;
        __be32          err;
-       __be32          err2;
        int             host_err;
 
        dentry = fhp->fh_dentry;
@@ -1299,22 +1331,8 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
        if (host_err < 0)
                goto out_nfserr;
 
-       err = nfsd_create_setattr(rqstp, resfhp, iap);
+       err = nfsd_create_setattr(rqstp, fhp, resfhp, iap);
 
-       /*
-        * nfsd_create_setattr already committed the child.  Transactional
-        * filesystems had a chance to commit changes for both parent and
-        * child simultaneously making the following commit_metadata a
-        * noop.
-        */
-       err2 = nfserrno(commit_metadata(fhp));
-       if (err2)
-               err = err2;
-       /*
-        * Update the file handle to get the new inode info.
-        */
-       if (!err)
-               err = fh_update(resfhp);
 out:
        dput(dchild);
        return err;
@@ -1505,20 +1523,7 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
        }
 
  set_attr:
-       err = nfsd_create_setattr(rqstp, resfhp, iap);
-
-       /*
-        * nfsd_create_setattr already committed the child
-        * (and possibly also the parent).
-        */
-       if (!err)
-               err = nfserrno(commit_metadata(fhp));
-
-       /*
-        * Update the filehandle to get the new inode info.
-        */
-       if (!err)
-               err = fh_update(resfhp);
+       err = nfsd_create_setattr(rqstp, fhp, resfhp, iap);
 
  out:
        fh_unlock(fhp);

diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index ccb87b2..1f32a83 100644 (file)
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -69,6 +69,8 @@ __be32                nfsd_create(struct svc_rqst *, struct svc_fh *,
                                char *name, int len, struct iattr *attrs,
                                int type, dev_t rdev, struct svc_fh *res);
 __be32         nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
+__be32         nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
+                               struct svc_fh *resfhp, struct iattr *iap);
 __be32         do_nfsd_create(struct svc_rqst *, struct svc_fh *,
                                char *name, int len, struct iattr *attrs,
                                struct svc_fh *res, int createmode,