knfsd: nfsd4: make readonly access depend on pseudoflavor

Allow readonly access to vary depending on the pseudoflavor, using the flag
passed with each pseudoflavor in the export downcall.  The rest of the flags
are ignored for now, though some day we might also allow id squashing to vary
based on the flavor.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 10 insertions, 8 deletions

diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index d5fe392b14fb..8d2b49914843 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -255,7 +255,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
 		goto out;
 
 	/* Finally, check access permissions. */
-	error = nfsd_permission(exp, dentry, access);
+	error = nfsd_permission(rqstp, exp, dentry, access);
 
 	if (error) {
 		dprintk("fh_verify: %s/%s permission failure, "
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index b2c7147aa921..977a71f64e19 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -278,7 +278,8 @@ nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 					 *   echo thing > device-special-file-or-pipe
 					 * by doing a CREATE with type==0
 					 */
-					nfserr = nfsd_permission(newfhp->fh_export,
+					nfserr = nfsd_permission(rqstp,
+								 newfhp->fh_export,
 								 newfhp->fh_dentry,
 								 MAY_WRITE|MAY_LOCAL_ACCESS);
 					if (nfserr && nfserr != nfserr_rofs)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 8e109e586a74..e90f4a8a1d01 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -328,7 +328,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 	/* The size case is special. It changes the file as well as the attributes.  */
 	if (iap->ia_valid & ATTR_SIZE) {
 		if (iap->ia_size < inode->i_size) {
-			err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
+			err = nfsd_permission(rqstp, fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
 			if (err)
 				goto out;
 		}
@@ -616,7 +616,7 @@ nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *suppor
 
 			sresult |= map->access;
 
-			err2 = nfsd_permission(export, dentry, map->how);
+			err2 = nfsd_permission(rqstp, export, dentry, map->how);
 			switch (err2) {
 			case nfs_ok:
 				result |= map->access;
@@ -1043,7 +1043,7 @@ nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 	__be32		err;
 
 	if (file) {
-		err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
+		err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
 				MAY_READ|MAY_OWNER_OVERRIDE);
 		if (err)
 			goto out;
@@ -1072,7 +1072,7 @@ nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 	__be32			err = 0;
 
 	if (file) {
-		err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
+		err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
 				MAY_WRITE|MAY_OWNER_OVERRIDE);
 		if (err)
 			goto out;
@@ -1801,7 +1801,8 @@ nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
  * Check for a user's access permissions to this inode.
  */
 __be32
-nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
+nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
+					struct dentry *dentry, int acc)
 {
 	struct inode	*inode = dentry->d_inode;
 	int		err;
@@ -1832,7 +1833,7 @@ nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
 	 */
 	if (!(acc & MAY_LOCAL_ACCESS))
 		if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
-			if (EX_RDONLY(exp) || IS_RDONLY(inode))
+			if (EX_RDONLY(exp, rqstp) || IS_RDONLY(inode))
 				return nfserr_rofs;
 			if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
 				return nfserr_perm;