NFSD: introduce struct nfsd_attrs

The attributes that nfsd might want to set on a file include 'struct
iattr' as well as an ACL and security label.
The latter two are passed around quite separately from the first, in
part because they are only needed for NFSv4.  This leads to some
clumsiness in the code, such as the attributes NOT being set in
nfsd_create_setattr().

We need to keep the directory locked until all attributes are set to
ensure the file is never visibile without all its attributes.  This need
combined with the inconsistent handling of attributes leads to more
clumsiness.

As a first step towards tidying this up, introduce 'struct nfsd_attrs'.
This is passed (by reference) to vfs.c functions that work with
attributes, and is assembled by the various nfs*proc functions which
call them.  As yet only iattr is included, but future patches will
expand this.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 14 insertions, 10 deletions

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index d79db56475d4..ad613e3a9301 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -349,11 +349,13 @@ nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp,
  * Set various file attributes.  After this call fhp needs an fh_put.
  */
 __be32
-nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
+nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
+	     struct nfsd_attrs *attr,
 	     int check_guard, time64_t guardtime)
 {
 	struct dentry	*dentry;
 	struct inode	*inode;
+	struct iattr	*iap = attr->na_iattr;
 	int		accmode = NFSD_MAY_SATTR;
 	umode_t		ftype = 0;
 	__be32		err;
@@ -1202,14 +1204,15 @@ out:
  * @rqstp: RPC transaction being executed
  * @fhp: NFS filehandle of parent directory
  * @resfhp: NFS filehandle of new object
- * @iap: requested attributes of new object
+ * @attrs: 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)
+		    struct svc_fh *resfhp, struct nfsd_attrs *attrs)
 {
+	struct iattr *iap = attrs->na_iattr;
 	__be32 status;
 
 	/*
@@ -1230,7 +1233,7 @@ nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	 * if the attributes have not changed.
 	 */
 	if (iap->ia_valid)
-		status = nfsd_setattr(rqstp, resfhp, iap, 0, (time64_t)0);
+		status = nfsd_setattr(rqstp, resfhp, attrs, 0, (time64_t)0);
 	else
 		status = nfserrno(commit_metadata(resfhp));
 
@@ -1269,11 +1272,12 @@ nfsd_check_ignore_resizing(struct iattr *iap)
 /* The parent directory should already be locked: */
 __be32
 nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
-		char *fname, int flen, struct iattr *iap,
-		int type, dev_t rdev, struct svc_fh *resfhp)
+		   char *fname, int flen, struct nfsd_attrs *attrs,
+		   int type, dev_t rdev, struct svc_fh *resfhp)
 {
 	struct dentry	*dentry, *dchild;
 	struct inode	*dirp;
+	struct iattr	*iap = attrs->na_iattr;
 	__be32		err;
 	int		host_err;
 
@@ -1347,7 +1351,7 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (host_err < 0)
 		goto out_nfserr;
 
-	err = nfsd_create_setattr(rqstp, fhp, resfhp, iap);
+	err = nfsd_create_setattr(rqstp, fhp, resfhp, attrs);
 
 out:
 	dput(dchild);
@@ -1366,8 +1370,8 @@ out_nfserr:
  */
 __be32
 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
-		char *fname, int flen, struct iattr *iap,
-		int type, dev_t rdev, struct svc_fh *resfhp)
+	    char *fname, int flen, struct nfsd_attrs *attrs,
+	    int type, dev_t rdev, struct svc_fh *resfhp)
 {
 	struct dentry	*dentry, *dchild = NULL;
 	__be32		err;
@@ -1399,7 +1403,7 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	dput(dchild);
 	if (err)
 		return err;
-	return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type,
+	return nfsd_create_locked(rqstp, fhp, fname, flen, attrs, type,
 					rdev, resfhp);
 }