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>

2 files changed, 14 insertions, 2 deletions

diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
index 424be41130ba..a01f775cb944 100644
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -112,10 +112,21 @@ struct svc_expkey {
 
 #define EX_SECURE(exp)          (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
 #define EX_ISSYNC(exp)          (!((exp)->ex_flags & NFSEXP_ASYNC))
-#define EX_RDONLY(exp)          ((exp)->ex_flags & NFSEXP_READONLY)
 #define EX_NOHIDE(exp)          ((exp)->ex_flags & NFSEXP_NOHIDE)
 #define EX_WGATHER(exp)         ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
 
+static inline int EX_RDONLY(struct svc_export *exp, struct svc_rqst *rqstp)
+{
+        struct exp_flavor_info *f;
+        struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
+
+        for (f = exp->ex_flavors; f < end; f++) {
+                if (f->pseudoflavor == rqstp->rq_flavor)
+                        return f->flags & NFSEXP_READONLY;
+        }
+        return exp->ex_flags & NFSEXP_READONLY;
+}
+
 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
 
 /*
diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index 62499c2f0918..54ef1a18a56c 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -119,7 +119,8 @@ __be32		nfsd_statfs(struct svc_rqst *, struct svc_fh *,
                                 struct kstatfs *);
 
 int             nfsd_notify_change(struct inode *, struct iattr *);
-__be32          nfsd_permission(struct svc_export *, struct dentry *, int);
+__be32          nfsd_permission(struct svc_rqst *, struct svc_export *,
+                                struct dentry *, int);
 int             nfsd_sync_dir(struct dentry *dp);
 
 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)