[PATCH] knfsd: Fix type mismatch with filldir_t used by nfsd

nfsd defines a type 'encode_dent_fn' which is much like 'filldir_t' except
that the first pointer is 'struct readdir_cd *' rather than 'void *'.  It
then casts encode_dent_fn points to 'filldir_t' as needed.  This hides any
other type mismatches between the two such as the fact that the 'ino' arg
recently changed from ino_t to u64.

So: get rid of 'encode_dent_fn', get rid of the cast of the function type,
change the first arg of various functions from 'struct readdir_cd *' to
'void *', and live with the fact that we have a little less type checking
on the calling of these functions now.  Less internal (to nfsd) checking
offset by more external checking, which is more important.

Thanks to Gabriel Paubert <paubert@iram.es> for discovering this and
providing an initial patch.

Signed-off-by: Gabriel Paubert <paubert@iram.es>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

7 files changed, 20 insertions, 19 deletions

diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 277df40f098d..e695660921ec 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -990,15 +990,16 @@ encode_entry(struct readdir_cd *ccd, const char *name,
 }
 
 int
-nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
-                     int namlen, loff_t offset, ino_t ino, unsigned int d_type)
+nfs3svc_encode_entry(void *cd, const char *name,
+                     int namlen, loff_t offset, u64 ino, unsigned int d_type)
 {
         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
 }
 
 int
-nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
-                          int namlen, loff_t offset, ino_t ino, unsigned int d_type)
+nfs3svc_encode_entry_plus(void *cd, const char *name,
+                          int namlen, loff_t offset, u64 ino,
+                          unsigned int d_type)
 {
         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
 }
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index fea46368afb2..18aa9440df14 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1880,9 +1880,10 @@ nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
 }
 
 static int
-nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
-                    loff_t offset, ino_t ino, unsigned int d_type)
+nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
+                    loff_t offset, u64 ino, unsigned int d_type)
 {
+        struct readdir_cd *ccd = ccdv;
         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
         int buflen;
         __be32 *p = cd->buffer;
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index f5243f943996..6555c50d9006 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -462,9 +462,10 @@ nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
 }
 
 int
-nfssvc_encode_entry(struct readdir_cd *ccd, const char *name,
-                    int namlen, loff_t offset, ino_t ino, unsigned int d_type)
+nfssvc_encode_entry(void *ccdv, const char *name,
+                    int namlen, loff_t offset, u64 ino, unsigned int d_type)
 {
+        struct readdir_cd *ccd = ccdv;
         struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
         __be32  *p = cd->buffer;
         int     buflen, slen;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 4dd49d6e90cd..5d32e5fa697e 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1716,7 +1716,7 @@ out:
  */
 __be32
 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 
-             struct readdir_cd *cdp, encode_dent_fn func)
+             struct readdir_cd *cdp, filldir_t func)
 {
         __be32          err;
         int             host_err;
@@ -1741,7 +1741,7 @@ nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
 
         do {
                 cdp->err = nfserr_eof; /* will be cleared on successful read */
-                host_err = vfs_readdir(file, (filldir_t) func, cdp);
+                host_err = vfs_readdir(file, func, cdp);
         } while (host_err >=0 && cdp->err == nfs_ok);
         if (host_err)
                 err = nfserrno(host_err);
diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index 0727774772ba..4b7c4b568f6d 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -52,8 +52,6 @@
 struct readdir_cd {
         __be32                  err;    /* 0, nfserr, or nfserr_eof */
 };
-typedef int             (*encode_dent_fn)(struct readdir_cd *, const char *,
-                                                int, loff_t, ino_t, unsigned int);
 typedef int (*nfsd_dirop_t)(struct inode *, struct dentry *, int, int);
 
 extern struct svc_program       nfsd_program;
@@ -117,7 +115,7 @@ __be32		nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
 int             nfsd_truncate(struct svc_rqst *, struct svc_fh *,
                                 unsigned long size);
 __be32          nfsd_readdir(struct svc_rqst *, struct svc_fh *,
-                             loff_t *, struct readdir_cd *, encode_dent_fn);
+                             loff_t *, struct readdir_cd *, filldir_t);
 __be32          nfsd_statfs(struct svc_rqst *, struct svc_fh *,
                                 struct kstatfs *);
 
diff --git a/include/linux/nfsd/xdr.h b/include/linux/nfsd/xdr.h
index 877192d3ae79..67885d5e6e50 100644
--- a/include/linux/nfsd/xdr.h
+++ b/include/linux/nfsd/xdr.h
@@ -165,8 +165,8 @@ int nfssvc_encode_readres(struct svc_rqst *, __be32 *, struct nfsd_readres *);
 int nfssvc_encode_statfsres(struct svc_rqst *, __be32 *, struct nfsd_statfsres *);
 int nfssvc_encode_readdirres(struct svc_rqst *, __be32 *, struct nfsd_readdirres *);
 
-int nfssvc_encode_entry(struct readdir_cd *, const char *name,
-                                int namlen, loff_t offset, ino_t ino, unsigned int);
+int nfssvc_encode_entry(void *, const char *name,
+                        int namlen, loff_t offset, u64 ino, unsigned int);
 
 int nfssvc_release_fhandle(struct svc_rqst *, __be32 *, struct nfsd_fhandle *);
 
diff --git a/include/linux/nfsd/xdr3.h b/include/linux/nfsd/xdr3.h
index 79963867b0d7..89d9d6061a62 100644
--- a/include/linux/nfsd/xdr3.h
+++ b/include/linux/nfsd/xdr3.h
@@ -331,11 +331,11 @@ int nfs3svc_release_fhandle(struct svc_rqst *, __be32 *,
                                 struct nfsd3_attrstat *);
 int nfs3svc_release_fhandle2(struct svc_rqst *, __be32 *,
                                 struct nfsd3_fhandle_pair *);
-int nfs3svc_encode_entry(struct readdir_cd *, const char *name,
-                                int namlen, loff_t offset, ino_t ino,
+int nfs3svc_encode_entry(void *, const char *name,
+                                int namlen, loff_t offset, u64 ino,
                                 unsigned int);
-int nfs3svc_encode_entry_plus(struct readdir_cd *, const char *name,
-                                int namlen, loff_t offset, ino_t ino,
+int nfs3svc_encode_entry_plus(void *, const char *name,
+                                int namlen, loff_t offset, u64 ino,
                                 unsigned int);
 /* Helper functions for NFSv3 ACL code */
 __be32 *nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p,