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-rw-r--r--fs/nfs/nfs2xdr.c406
1 files changed, 403 insertions, 3 deletions
diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index 5914a1911c9..869e2151a2b 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -61,6 +61,23 @@
#define NFS_readdirres_sz (1)
#define NFS_statfsres_sz (1+NFS_info_sz)
+
+/*
+ * While encoding arguments, set up the reply buffer in advance to
+ * receive reply data directly into the page cache.
+ */
+static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
+ unsigned int base, unsigned int len,
+ unsigned int bufsize)
+{
+ struct rpc_auth *auth = req->rq_cred->cr_auth;
+ unsigned int replen;
+
+ replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
+ xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
+}
+
+
/*
* Common NFS XDR functions as inlines
*/
@@ -81,7 +98,7 @@ xdr_decode_fhandle(__be32 *p, struct nfs_fh *fhandle)
}
static inline __be32*
-xdr_encode_time(__be32 *p, struct timespec *timep)
+xdr_encode_time(__be32 *p, const struct timespec *timep)
{
*p++ = htonl(timep->tv_sec);
/* Convert nanoseconds into microseconds */
@@ -90,7 +107,7 @@ xdr_encode_time(__be32 *p, struct timespec *timep)
}
static inline __be32*
-xdr_encode_current_server_time(__be32 *p, struct timespec *timep)
+xdr_encode_current_server_time(__be32 *p, const struct timespec *timep)
{
/*
* Passing the invalid value useconds=1000000 is a
@@ -174,6 +191,136 @@ xdr_encode_sattr(__be32 *p, struct iattr *attr)
}
/*
+ * Encode/decode NFSv2 basic data types
+ *
+ * Basic NFSv2 data types are defined in section 2.3 of RFC 1094:
+ * "NFS: Network File System Protocol Specification".
+ *
+ * Not all basic data types have their own encoding and decoding
+ * functions. For run-time efficiency, some data types are encoded
+ * or decoded inline.
+ */
+
+/*
+ * 2.3.3. fhandle
+ *
+ * typedef opaque fhandle[FHSIZE];
+ */
+static void encode_fhandle(struct xdr_stream *xdr, const struct nfs_fh *fh)
+{
+ __be32 *p;
+
+ BUG_ON(fh->size != NFS2_FHSIZE);
+ p = xdr_reserve_space(xdr, NFS2_FHSIZE);
+ memcpy(p, fh->data, NFS2_FHSIZE);
+}
+
+/*
+ * 2.3.6. sattr
+ *
+ * struct sattr {
+ * unsigned int mode;
+ * unsigned int uid;
+ * unsigned int gid;
+ * unsigned int size;
+ * timeval atime;
+ * timeval mtime;
+ * };
+ */
+
+#define NFS2_SATTR_NOT_SET (0xffffffff)
+
+static __be32 *xdr_time_not_set(__be32 *p)
+{
+ *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
+ *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
+ return p;
+}
+
+static void encode_sattr(struct xdr_stream *xdr, const struct iattr *attr)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, NFS_sattr_sz << 2);
+
+ if (attr->ia_valid & ATTR_MODE)
+ *p++ = cpu_to_be32(attr->ia_mode);
+ else
+ *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
+ if (attr->ia_valid & ATTR_UID)
+ *p++ = cpu_to_be32(attr->ia_uid);
+ else
+ *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
+ if (attr->ia_valid & ATTR_GID)
+ *p++ = cpu_to_be32(attr->ia_gid);
+ else
+ *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
+ if (attr->ia_valid & ATTR_SIZE)
+ *p++ = cpu_to_be32((u32)attr->ia_size);
+ else
+ *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
+
+ if (attr->ia_valid & ATTR_ATIME_SET)
+ p = xdr_encode_time(p, &attr->ia_atime);
+ else if (attr->ia_valid & ATTR_ATIME)
+ p = xdr_encode_current_server_time(p, &attr->ia_atime);
+ else
+ p = xdr_time_not_set(p);
+ if (attr->ia_valid & ATTR_MTIME_SET)
+ xdr_encode_time(p, &attr->ia_mtime);
+ else if (attr->ia_valid & ATTR_MTIME)
+ xdr_encode_current_server_time(p, &attr->ia_mtime);
+ else
+ xdr_time_not_set(p);
+}
+
+/*
+ * 2.3.7. filename
+ *
+ * typedef string filename<MAXNAMLEN>;
+ */
+static void encode_filename(struct xdr_stream *xdr,
+ const char *name, u32 length)
+{
+ __be32 *p;
+
+ BUG_ON(length > NFS2_MAXNAMLEN);
+ p = xdr_reserve_space(xdr, 4 + length);
+ xdr_encode_opaque(p, name, length);
+}
+
+/*
+ * 2.3.8. path
+ *
+ * typedef string path<MAXPATHLEN>;
+ */
+static void encode_path(struct xdr_stream *xdr, struct page **pages, u32 length)
+{
+ __be32 *p;
+
+ BUG_ON(length > NFS2_MAXPATHLEN);
+ p = xdr_reserve_space(xdr, 4);
+ *p = cpu_to_be32(length);
+ xdr_write_pages(xdr, pages, 0, length);
+}
+
+/*
+ * 2.3.10. diropargs
+ *
+ * struct diropargs {
+ * fhandle dir;
+ * filename name;
+ * };
+ */
+static void encode_diropargs(struct xdr_stream *xdr, const struct nfs_fh *fh,
+ const char *name, u32 length)
+{
+ encode_fhandle(xdr, fh);
+ encode_filename(xdr, name, length);
+}
+
+
+/*
* NFS encode functions
*/
/*
@@ -188,6 +335,16 @@ nfs_xdr_fhandle(struct rpc_rqst *req, __be32 *p, struct nfs_fh *fh)
return 0;
}
+static int nfs2_xdr_enc_fhandle(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_fh *fh)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_fhandle(&xdr, fh);
+ return 0;
+}
+
/*
* Encode SETATTR arguments
*/
@@ -201,6 +358,25 @@ nfs_xdr_sattrargs(struct rpc_rqst *req, __be32 *p, struct nfs_sattrargs *args)
}
/*
+ * 2.2.3. sattrargs
+ *
+ * struct sattrargs {
+ * fhandle file;
+ * sattr attributes;
+ * };
+ */
+static int nfs2_xdr_enc_sattrargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_sattrargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_fhandle(&xdr, args->fh);
+ encode_sattr(&xdr, args->sattr);
+ return 0;
+}
+
+/*
* Encode directory ops argument
* LOOKUP, RMDIR
*/
@@ -213,6 +389,16 @@ nfs_xdr_diropargs(struct rpc_rqst *req, __be32 *p, struct nfs_diropargs *args)
return 0;
}
+static int nfs2_xdr_enc_diropargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_diropargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_diropargs(&xdr, args->fh, args->name, args->len);
+ return 0;
+}
+
/*
* Encode REMOVE argument
*/
@@ -225,6 +411,18 @@ nfs_xdr_removeargs(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs
return 0;
}
+static int nfs2_xdr_enc_readlinkargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_readlinkargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_fhandle(&xdr, args->fh);
+ prepare_reply_buffer(req, args->pages, args->pgbase,
+ args->pglen, NFS_readlinkres_sz);
+ return 0;
+}
+
/*
* Arguments to a READ call. Since we read data directly into the page
* cache, we also set up the reply iovec here so that iov[1] points
@@ -253,6 +451,44 @@ nfs_xdr_readargs(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
}
/*
+ * 2.2.7. readargs
+ *
+ * struct readargs {
+ * fhandle file;
+ * unsigned offset;
+ * unsigned count;
+ * unsigned totalcount;
+ * };
+ */
+static void encode_readargs(struct xdr_stream *xdr,
+ const struct nfs_readargs *args)
+{
+ u32 offset = args->offset;
+ u32 count = args->count;
+ __be32 *p;
+
+ encode_fhandle(xdr, args->fh);
+
+ p = xdr_reserve_space(xdr, 4 + 4 + 4);
+ *p++ = cpu_to_be32(offset);
+ *p++ = cpu_to_be32(count);
+ *p = cpu_to_be32(count);
+}
+
+static int nfs2_xdr_enc_readargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_readargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_readargs(&xdr, args);
+ prepare_reply_buffer(req, args->pages, args->pgbase,
+ args->count, NFS_readres_sz);
+ req->rq_rcv_buf.flags |= XDRBUF_READ;
+ return 0;
+}
+
+/*
* Decode READ reply
*/
static int
@@ -318,6 +554,47 @@ nfs_xdr_writeargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
}
/*
+ * 2.2.9. writeargs
+ *
+ * struct writeargs {
+ * fhandle file;
+ * unsigned beginoffset;
+ * unsigned offset;
+ * unsigned totalcount;
+ * nfsdata data;
+ * };
+ */
+static void encode_writeargs(struct xdr_stream *xdr,
+ const struct nfs_writeargs *args)
+{
+ u32 offset = args->offset;
+ u32 count = args->count;
+ __be32 *p;
+
+ encode_fhandle(xdr, args->fh);
+
+ p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
+ *p++ = cpu_to_be32(offset);
+ *p++ = cpu_to_be32(offset);
+ *p++ = cpu_to_be32(count);
+
+ /* nfsdata */
+ *p = cpu_to_be32(count);
+ xdr_write_pages(xdr, args->pages, args->pgbase, count);
+}
+
+static int nfs2_xdr_enc_writeargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_writeargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_writeargs(&xdr, args);
+ xdr.buf->flags |= XDRBUF_WRITE;
+ return 0;
+}
+
+/*
* Encode create arguments
* CREATE, MKDIR
*/
@@ -332,6 +609,35 @@ nfs_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs_createargs *args)
}
/*
+ * 2.2.10. createargs
+ *
+ * struct createargs {
+ * diropargs where;
+ * sattr attributes;
+ * };
+ */
+static int nfs2_xdr_enc_createargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_createargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_diropargs(&xdr, args->fh, args->name, args->len);
+ encode_sattr(&xdr, args->sattr);
+ return 0;
+}
+
+static int nfs2_xdr_enc_removeargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_removeargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_diropargs(&xdr, args->fh, args->name.name, args->name.len);
+ return 0;
+}
+
+/*
* Encode RENAME arguments
*/
static int
@@ -346,6 +652,27 @@ nfs_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs_renameargs *args)
}
/*
+ * 2.2.12. renameargs
+ *
+ * struct renameargs {
+ * diropargs from;
+ * diropargs to;
+ * };
+ */
+static int nfs2_xdr_enc_renameargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_renameargs *args)
+{
+ const struct qstr *old = args->old_name;
+ const struct qstr *new = args->new_name;
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_diropargs(&xdr, args->old_dir, old->name, old->len);
+ encode_diropargs(&xdr, args->new_dir, new->name, new->len);
+ return 0;
+}
+
+/*
* Encode LINK arguments
*/
static int
@@ -359,6 +686,25 @@ nfs_xdr_linkargs(struct rpc_rqst *req, __be32 *p, struct nfs_linkargs *args)
}
/*
+ * 2.2.13. linkargs
+ *
+ * struct linkargs {
+ * fhandle from;
+ * diropargs to;
+ * };
+ */
+static int nfs2_xdr_enc_linkargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_linkargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_fhandle(&xdr, args->fromfh);
+ encode_diropargs(&xdr, args->tofh, args->toname, args->tolen);
+ return 0;
+}
+
+/*
* Encode SYMLINK arguments
*/
static int
@@ -388,6 +734,27 @@ nfs_xdr_symlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs_symlinkargs *arg
}
/*
+ * 2.2.14. symlinkargs
+ *
+ * struct symlinkargs {
+ * diropargs from;
+ * path to;
+ * sattr attributes;
+ * };
+ */
+static int nfs2_xdr_enc_symlinkargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_symlinkargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_diropargs(&xdr, args->fromfh, args->fromname, args->fromlen);
+ encode_path(&xdr, args->pages, args->pathlen);
+ encode_sattr(&xdr, args->sattr);
+ return 0;
+}
+
+/*
* Encode arguments to readdir call
*/
static int
@@ -409,6 +776,39 @@ nfs_xdr_readdirargs(struct rpc_rqst *req, __be32 *p, struct nfs_readdirargs *arg
}
/*
+ * 2.2.17. readdirargs
+ *
+ * struct readdirargs {
+ * fhandle dir;
+ * nfscookie cookie;
+ * unsigned count;
+ * };
+ */
+static void encode_readdirargs(struct xdr_stream *xdr,
+ const struct nfs_readdirargs *args)
+{
+ __be32 *p;
+
+ encode_fhandle(xdr, args->fh);
+
+ p = xdr_reserve_space(xdr, 4 + 4);
+ *p++ = cpu_to_be32(args->cookie);
+ *p = cpu_to_be32(args->count);
+}
+
+static int nfs2_xdr_enc_readdirargs(struct rpc_rqst *req, __be32 *p,
+ const struct nfs_readdirargs *args)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_readdirargs(&xdr, args);
+ prepare_reply_buffer(req, args->pages, 0,
+ args->count, NFS_readdirres_sz);
+ return 0;
+}
+
+/*
* Decode the result of a readdir call.
* We're not really decoding anymore, we just leave the buffer untouched
* and only check that it is syntactically correct.
@@ -698,7 +1098,7 @@ nfs_stat_to_errno(int stat)
#define PROC(proc, argtype, restype, timer) \
[NFSPROC_##proc] = { \
.p_proc = NFSPROC_##proc, \
- .p_encode = (kxdrproc_t) nfs_xdr_##argtype, \
+ .p_encode = (kxdrproc_t)nfs2_xdr_enc_##argtype, \
.p_decode = (kxdrproc_t) nfs_xdr_##restype, \
.p_arglen = NFS_##argtype##_sz, \
.p_replen = NFS_##restype##_sz, \
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-23 23:40:06 +0000