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-rw-r--r--fs/nfs/nfs3xdr.c1023
1 files changed, 1023 insertions, 0 deletions
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
new file mode 100644
index 000000000000..a3593d47e5ab
--- /dev/null
+++ b/fs/nfs/nfs3xdr.c
@@ -0,0 +1,1023 @@
+/*
+ * linux/fs/nfs/nfs3xdr.c
+ *
+ * XDR functions to encode/decode NFSv3 RPC arguments and results.
+ *
+ * Copyright (C) 1996, 1997 Olaf Kirch
+ */
+
+#include <linux/param.h>
+#include <linux/time.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/utsname.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/in.h>
+#include <linux/pagemap.h>
+#include <linux/proc_fs.h>
+#include <linux/kdev_t.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/nfs.h>
+#include <linux/nfs3.h>
+#include <linux/nfs_fs.h>
+
+#define NFSDBG_FACILITY NFSDBG_XDR
+
+/* Mapping from NFS error code to "errno" error code. */
+#define errno_NFSERR_IO EIO
+
+extern int nfs_stat_to_errno(int);
+
+/*
+ * Declare the space requirements for NFS arguments and replies as
+ * number of 32bit-words
+ */
+#define NFS3_fhandle_sz (1+16)
+#define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
+#define NFS3_sattr_sz (15)
+#define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
+#define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
+#define NFS3_fattr_sz (21)
+#define NFS3_wcc_attr_sz (6)
+#define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
+#define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
+#define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
+#define NFS3_fsstat_sz
+#define NFS3_fsinfo_sz
+#define NFS3_pathconf_sz
+#define NFS3_entry_sz (NFS3_filename_sz+3)
+
+#define NFS3_sattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
+#define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
+#define NFS3_accessargs_sz (NFS3_fh_sz+1)
+#define NFS3_readlinkargs_sz (NFS3_fh_sz)
+#define NFS3_readargs_sz (NFS3_fh_sz+3)
+#define NFS3_writeargs_sz (NFS3_fh_sz+5)
+#define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
+#define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
+#define NFS3_symlinkargs_sz (NFS3_diropargs_sz+NFS3_path_sz+NFS3_sattr_sz)
+#define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
+#define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
+#define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
+#define NFS3_readdirargs_sz (NFS3_fh_sz+2)
+#define NFS3_commitargs_sz (NFS3_fh_sz+3)
+
+#define NFS3_attrstat_sz (1+NFS3_fattr_sz)
+#define NFS3_wccstat_sz (1+NFS3_wcc_data_sz)
+#define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
+#define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
+#define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
+#define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
+#define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
+#define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
+#define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
+#define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
+#define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2)
+#define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
+#define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
+#define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
+#define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
+
+/*
+ * Map file type to S_IFMT bits
+ */
+static struct {
+ unsigned int mode;
+ unsigned int nfs2type;
+} nfs_type2fmt[] = {
+ { 0, NFNON },
+ { S_IFREG, NFREG },
+ { S_IFDIR, NFDIR },
+ { S_IFBLK, NFBLK },
+ { S_IFCHR, NFCHR },
+ { S_IFLNK, NFLNK },
+ { S_IFSOCK, NFSOCK },
+ { S_IFIFO, NFFIFO },
+ { 0, NFBAD }
+};
+
+/*
+ * Common NFS XDR functions as inlines
+ */
+static inline u32 *
+xdr_encode_fhandle(u32 *p, struct nfs_fh *fh)
+{
+ return xdr_encode_array(p, fh->data, fh->size);
+}
+
+static inline u32 *
+xdr_decode_fhandle(u32 *p, struct nfs_fh *fh)
+{
+ if ((fh->size = ntohl(*p++)) <= NFS3_FHSIZE) {
+ memcpy(fh->data, p, fh->size);
+ return p + XDR_QUADLEN(fh->size);
+ }
+ return NULL;
+}
+
+/*
+ * Encode/decode time.
+ */
+static inline u32 *
+xdr_encode_time3(u32 *p, struct timespec *timep)
+{
+ *p++ = htonl(timep->tv_sec);
+ *p++ = htonl(timep->tv_nsec);
+ return p;
+}
+
+static inline u32 *
+xdr_decode_time3(u32 *p, struct timespec *timep)
+{
+ timep->tv_sec = ntohl(*p++);
+ timep->tv_nsec = ntohl(*p++);
+ return p;
+}
+
+static u32 *
+xdr_decode_fattr(u32 *p, struct nfs_fattr *fattr)
+{
+ unsigned int type, major, minor;
+ int fmode;
+
+ type = ntohl(*p++);
+ if (type >= NF3BAD)
+ type = NF3BAD;
+ fmode = nfs_type2fmt[type].mode;
+ fattr->type = nfs_type2fmt[type].nfs2type;
+ fattr->mode = (ntohl(*p++) & ~S_IFMT) | fmode;
+ fattr->nlink = ntohl(*p++);
+ fattr->uid = ntohl(*p++);
+ fattr->gid = ntohl(*p++);
+ p = xdr_decode_hyper(p, &fattr->size);
+ p = xdr_decode_hyper(p, &fattr->du.nfs3.used);
+
+ /* Turn remote device info into Linux-specific dev_t */
+ major = ntohl(*p++);
+ minor = ntohl(*p++);
+ fattr->rdev = MKDEV(major, minor);
+ if (MAJOR(fattr->rdev) != major || MINOR(fattr->rdev) != minor)
+ fattr->rdev = 0;
+
+ p = xdr_decode_hyper(p, &fattr->fsid_u.nfs3);
+ p = xdr_decode_hyper(p, &fattr->fileid);
+ p = xdr_decode_time3(p, &fattr->atime);
+ p = xdr_decode_time3(p, &fattr->mtime);
+ p = xdr_decode_time3(p, &fattr->ctime);
+
+ /* Update the mode bits */
+ fattr->valid |= (NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3);
+ fattr->timestamp = jiffies;
+ return p;
+}
+
+static inline u32 *
+xdr_encode_sattr(u32 *p, struct iattr *attr)
+{
+ if (attr->ia_valid & ATTR_MODE) {
+ *p++ = xdr_one;
+ *p++ = htonl(attr->ia_mode);
+ } else {
+ *p++ = xdr_zero;
+ }
+ if (attr->ia_valid & ATTR_UID) {
+ *p++ = xdr_one;
+ *p++ = htonl(attr->ia_uid);
+ } else {
+ *p++ = xdr_zero;
+ }
+ if (attr->ia_valid & ATTR_GID) {
+ *p++ = xdr_one;
+ *p++ = htonl(attr->ia_gid);
+ } else {
+ *p++ = xdr_zero;
+ }
+ if (attr->ia_valid & ATTR_SIZE) {
+ *p++ = xdr_one;
+ p = xdr_encode_hyper(p, (__u64) attr->ia_size);
+ } else {
+ *p++ = xdr_zero;
+ }
+ if (attr->ia_valid & ATTR_ATIME_SET) {
+ *p++ = xdr_two;
+ p = xdr_encode_time3(p, &attr->ia_atime);
+ } else if (attr->ia_valid & ATTR_ATIME) {
+ *p++ = xdr_one;
+ } else {
+ *p++ = xdr_zero;
+ }
+ if (attr->ia_valid & ATTR_MTIME_SET) {
+ *p++ = xdr_two;
+ p = xdr_encode_time3(p, &attr->ia_mtime);
+ } else if (attr->ia_valid & ATTR_MTIME) {
+ *p++ = xdr_one;
+ } else {
+ *p++ = xdr_zero;
+ }
+ return p;
+}
+
+static inline u32 *
+xdr_decode_wcc_attr(u32 *p, struct nfs_fattr *fattr)
+{
+ p = xdr_decode_hyper(p, &fattr->pre_size);
+ p = xdr_decode_time3(p, &fattr->pre_mtime);
+ p = xdr_decode_time3(p, &fattr->pre_ctime);
+ fattr->valid |= NFS_ATTR_WCC;
+ return p;
+}
+
+static inline u32 *
+xdr_decode_post_op_attr(u32 *p, struct nfs_fattr *fattr)
+{
+ if (*p++)
+ p = xdr_decode_fattr(p, fattr);
+ return p;
+}
+
+static inline u32 *
+xdr_decode_pre_op_attr(u32 *p, struct nfs_fattr *fattr)
+{
+ if (*p++)
+ return xdr_decode_wcc_attr(p, fattr);
+ return p;
+}
+
+
+static inline u32 *
+xdr_decode_wcc_data(u32 *p, struct nfs_fattr *fattr)
+{
+ p = xdr_decode_pre_op_attr(p, fattr);
+ return xdr_decode_post_op_attr(p, fattr);
+}
+
+/*
+ * NFS encode functions
+ */
+
+/*
+ * Encode file handle argument
+ */
+static int
+nfs3_xdr_fhandle(struct rpc_rqst *req, u32 *p, struct nfs_fh *fh)
+{
+ p = xdr_encode_fhandle(p, fh);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode SETATTR arguments
+ */
+static int
+nfs3_xdr_sattrargs(struct rpc_rqst *req, u32 *p, struct nfs3_sattrargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_sattr(p, args->sattr);
+ *p++ = htonl(args->guard);
+ if (args->guard)
+ p = xdr_encode_time3(p, &args->guardtime);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode directory ops argument
+ */
+static int
+nfs3_xdr_diropargs(struct rpc_rqst *req, u32 *p, struct nfs3_diropargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_array(p, args->name, args->len);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode access() argument
+ */
+static int
+nfs3_xdr_accessargs(struct rpc_rqst *req, u32 *p, struct nfs3_accessargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fh);
+ *p++ = htonl(args->access);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ 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
+ * exactly to the page we want to fetch.
+ */
+static int
+nfs3_xdr_readargs(struct rpc_rqst *req, u32 *p, struct nfs_readargs *args)
+{
+ struct rpc_auth *auth = req->rq_task->tk_auth;
+ unsigned int replen;
+ u32 count = args->count;
+
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_hyper(p, args->offset);
+ *p++ = htonl(count);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+
+ /* Inline the page array */
+ replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readres_sz) << 2;
+ xdr_inline_pages(&req->rq_rcv_buf, replen,
+ args->pages, args->pgbase, count);
+ return 0;
+}
+
+/*
+ * Write arguments. Splice the buffer to be written into the iovec.
+ */
+static int
+nfs3_xdr_writeargs(struct rpc_rqst *req, u32 *p, struct nfs_writeargs *args)
+{
+ struct xdr_buf *sndbuf = &req->rq_snd_buf;
+ u32 count = args->count;
+
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_hyper(p, args->offset);
+ *p++ = htonl(count);
+ *p++ = htonl(args->stable);
+ *p++ = htonl(count);
+ sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
+
+ /* Copy the page array */
+ xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
+ return 0;
+}
+
+/*
+ * Encode CREATE arguments
+ */
+static int
+nfs3_xdr_createargs(struct rpc_rqst *req, u32 *p, struct nfs3_createargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_array(p, args->name, args->len);
+
+ *p++ = htonl(args->createmode);
+ if (args->createmode == NFS3_CREATE_EXCLUSIVE) {
+ *p++ = args->verifier[0];
+ *p++ = args->verifier[1];
+ } else
+ p = xdr_encode_sattr(p, args->sattr);
+
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode MKDIR arguments
+ */
+static int
+nfs3_xdr_mkdirargs(struct rpc_rqst *req, u32 *p, struct nfs3_mkdirargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_array(p, args->name, args->len);
+ p = xdr_encode_sattr(p, args->sattr);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode SYMLINK arguments
+ */
+static int
+nfs3_xdr_symlinkargs(struct rpc_rqst *req, u32 *p, struct nfs3_symlinkargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fromfh);
+ p = xdr_encode_array(p, args->fromname, args->fromlen);
+ p = xdr_encode_sattr(p, args->sattr);
+ p = xdr_encode_array(p, args->topath, args->tolen);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode MKNOD arguments
+ */
+static int
+nfs3_xdr_mknodargs(struct rpc_rqst *req, u32 *p, struct nfs3_mknodargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_array(p, args->name, args->len);
+ *p++ = htonl(args->type);
+ p = xdr_encode_sattr(p, args->sattr);
+ if (args->type == NF3CHR || args->type == NF3BLK) {
+ *p++ = htonl(MAJOR(args->rdev));
+ *p++ = htonl(MINOR(args->rdev));
+ }
+
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode RENAME arguments
+ */
+static int
+nfs3_xdr_renameargs(struct rpc_rqst *req, u32 *p, struct nfs3_renameargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fromfh);
+ p = xdr_encode_array(p, args->fromname, args->fromlen);
+ p = xdr_encode_fhandle(p, args->tofh);
+ p = xdr_encode_array(p, args->toname, args->tolen);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode LINK arguments
+ */
+static int
+nfs3_xdr_linkargs(struct rpc_rqst *req, u32 *p, struct nfs3_linkargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fromfh);
+ p = xdr_encode_fhandle(p, args->tofh);
+ p = xdr_encode_array(p, args->toname, args->tolen);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * Encode arguments to readdir call
+ */
+static int
+nfs3_xdr_readdirargs(struct rpc_rqst *req, u32 *p, struct nfs3_readdirargs *args)
+{
+ struct rpc_auth *auth = req->rq_task->tk_auth;
+ unsigned int replen;
+ u32 count = args->count;
+
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_hyper(p, args->cookie);
+ *p++ = args->verf[0];
+ *p++ = args->verf[1];
+ if (args->plus) {
+ /* readdirplus: need dircount + buffer size.
+ * We just make sure we make dircount big enough */
+ *p++ = htonl(count >> 3);
+ }
+ *p++ = htonl(count);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+
+ /* Inline the page array */
+ replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readdirres_sz) << 2;
+ xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
+ return 0;
+}
+
+/*
+ * Decode the result of a readdir call.
+ * We just check for syntactical correctness.
+ */
+static int
+nfs3_xdr_readdirres(struct rpc_rqst *req, u32 *p, struct nfs3_readdirres *res)
+{
+ struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
+ struct kvec *iov = rcvbuf->head;
+ struct page **page;
+ int hdrlen, recvd;
+ int status, nr;
+ unsigned int len, pglen;
+ u32 *entry, *end, *kaddr;
+
+ status = ntohl(*p++);
+ /* Decode post_op_attrs */
+ p = xdr_decode_post_op_attr(p, res->dir_attr);
+ if (status)
+ return -nfs_stat_to_errno(status);
+ /* Decode verifier cookie */
+ if (res->verf) {
+ res->verf[0] = *p++;
+ res->verf[1] = *p++;
+ } else {
+ p += 2;
+ }
+
+ hdrlen = (u8 *) p - (u8 *) iov->iov_base;
+ if (iov->iov_len < hdrlen) {
+ printk(KERN_WARNING "NFS: READDIR reply header overflowed:"
+ "length %d > %Zu\n", hdrlen, iov->iov_len);
+ return -errno_NFSERR_IO;
+ } else if (iov->iov_len != hdrlen) {
+ dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
+ xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
+ }
+
+ pglen = rcvbuf->page_len;
+ recvd = rcvbuf->len - hdrlen;
+ if (pglen > recvd)
+ pglen = recvd;
+ page = rcvbuf->pages;
+ kaddr = p = (u32 *)kmap_atomic(*page, KM_USER0);
+ end = (u32 *)((char *)p + pglen);
+ entry = p;
+ for (nr = 0; *p++; nr++) {
+ if (p + 3 > end)
+ goto short_pkt;
+ p += 2; /* inode # */
+ len = ntohl(*p++); /* string length */
+ p += XDR_QUADLEN(len) + 2; /* name + cookie */
+ if (len > NFS3_MAXNAMLEN) {
+ printk(KERN_WARNING "NFS: giant filename in readdir (len %x)!\n",
+ len);
+ goto err_unmap;
+ }
+
+ if (res->plus) {
+ /* post_op_attr */
+ if (p + 2 > end)
+ goto short_pkt;
+ if (*p++) {
+ p += 21;
+ if (p + 1 > end)
+ goto short_pkt;
+ }
+ /* post_op_fh3 */
+ if (*p++) {
+ if (p + 1 > end)
+ goto short_pkt;
+ len = ntohl(*p++);
+ if (len > NFS3_FHSIZE) {
+ printk(KERN_WARNING "NFS: giant filehandle in "
+ "readdir (len %x)!\n", len);
+ goto err_unmap;
+ }
+ p += XDR_QUADLEN(len);
+ }
+ }
+
+ if (p + 2 > end)
+ goto short_pkt;
+ entry = p;
+ }
+ if (!nr && (entry[0] != 0 || entry[1] == 0))
+ goto short_pkt;
+ out:
+ kunmap_atomic(kaddr, KM_USER0);
+ return nr;
+ short_pkt:
+ entry[0] = entry[1] = 0;
+ /* truncate listing ? */
+ if (!nr) {
+ printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
+ entry[1] = 1;
+ }
+ goto out;
+err_unmap:
+ nr = -errno_NFSERR_IO;
+ goto out;
+}
+
+u32 *
+nfs3_decode_dirent(u32 *p, struct nfs_entry *entry, int plus)
+{
+ struct nfs_entry old = *entry;
+
+ if (!*p++) {
+ if (!*p)
+ return ERR_PTR(-EAGAIN);
+ entry->eof = 1;
+ return ERR_PTR(-EBADCOOKIE);
+ }
+
+ p = xdr_decode_hyper(p, &entry->ino);
+ entry->len = ntohl(*p++);
+ entry->name = (const char *) p;
+ p += XDR_QUADLEN(entry->len);
+ entry->prev_cookie = entry->cookie;
+ p = xdr_decode_hyper(p, &entry->cookie);
+
+ if (plus) {
+ entry->fattr->valid = 0;
+ p = xdr_decode_post_op_attr(p, entry->fattr);
+ /* In fact, a post_op_fh3: */
+ if (*p++) {
+ p = xdr_decode_fhandle(p, entry->fh);
+ /* Ugh -- server reply was truncated */
+ if (p == NULL) {
+ dprintk("NFS: FH truncated\n");
+ *entry = old;
+ return ERR_PTR(-EAGAIN);
+ }
+ } else
+ memset((u8*)(entry->fh), 0, sizeof(*entry->fh));
+ }
+
+ entry->eof = !p[0] && p[1];
+ return p;
+}
+
+/*
+ * Encode COMMIT arguments
+ */
+static int
+nfs3_xdr_commitargs(struct rpc_rqst *req, u32 *p, struct nfs_writeargs *args)
+{
+ p = xdr_encode_fhandle(p, args->fh);
+ p = xdr_encode_hyper(p, args->offset);
+ *p++ = htonl(args->count);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+ return 0;
+}
+
+/*
+ * NFS XDR decode functions
+ */
+
+/*
+ * Decode attrstat reply.
+ */
+static int
+nfs3_xdr_attrstat(struct rpc_rqst *req, u32 *p, struct nfs_fattr *fattr)
+{
+ int status;
+
+ if ((status = ntohl(*p++)))
+ return -nfs_stat_to_errno(status);
+ xdr_decode_fattr(p, fattr);
+ return 0;
+}
+
+/*
+ * Decode status+wcc_data reply
+ * SATTR, REMOVE, RMDIR
+ */
+static int
+nfs3_xdr_wccstat(struct rpc_rqst *req, u32 *p, struct nfs_fattr *fattr)
+{
+ int status;
+
+ if ((status = ntohl(*p++)))
+ status = -nfs_stat_to_errno(status);
+ xdr_decode_wcc_data(p, fattr);
+ return status;
+}
+
+/*
+ * Decode LOOKUP reply
+ */
+static int
+nfs3_xdr_lookupres(struct rpc_rqst *req, u32 *p, struct nfs3_diropres *res)
+{
+ int status;
+
+ if ((status = ntohl(*p++))) {
+ status = -nfs_stat_to_errno(status);
+ } else {
+ if (!(p = xdr_decode_fhandle(p, res->fh)))
+ return -errno_NFSERR_IO;
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ }
+ xdr_decode_post_op_attr(p, res->dir_attr);
+ return status;
+}
+
+/*
+ * Decode ACCESS reply
+ */
+static int
+nfs3_xdr_accessres(struct rpc_rqst *req, u32 *p, struct nfs3_accessres *res)
+{
+ int status = ntohl(*p++);
+
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ if (status)
+ return -nfs_stat_to_errno(status);
+ res->access = ntohl(*p++);
+ return 0;
+}
+
+static int
+nfs3_xdr_readlinkargs(struct rpc_rqst *req, u32 *p, struct nfs3_readlinkargs *args)
+{
+ struct rpc_auth *auth = req->rq_task->tk_auth;
+ unsigned int replen;
+
+ p = xdr_encode_fhandle(p, args->fh);
+ req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
+
+ /* Inline the page array */
+ replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readlinkres_sz) << 2;
+ xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
+ return 0;
+}
+
+/*
+ * Decode READLINK reply
+ */
+static int
+nfs3_xdr_readlinkres(struct rpc_rqst *req, u32 *p, struct nfs_fattr *fattr)
+{
+ struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
+ struct kvec *iov = rcvbuf->head;
+ int hdrlen, len, recvd;
+ char *kaddr;
+ int status;
+
+ status = ntohl(*p++);
+ p = xdr_decode_post_op_attr(p, fattr);
+
+ if (status != 0)
+ return -nfs_stat_to_errno(status);
+
+ /* Convert length of symlink */
+ len = ntohl(*p++);
+ if (len >= rcvbuf->page_len || len <= 0) {
+ dprintk(KERN_WARNING "nfs: server returned giant symlink!\n");
+ return -ENAMETOOLONG;
+ }
+
+ hdrlen = (u8 *) p - (u8 *) iov->iov_base;
+ if (iov->iov_len < hdrlen) {
+ printk(KERN_WARNING "NFS: READLINK reply header overflowed:"
+ "length %d > %Zu\n", hdrlen, iov->iov_len);
+ return -errno_NFSERR_IO;
+ } else if (iov->iov_len != hdrlen) {
+ dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
+ xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
+ }
+ recvd = req->rq_rcv_buf.len - hdrlen;
+ if (recvd < len) {
+ printk(KERN_WARNING "NFS: server cheating in readlink reply: "
+ "count %u > recvd %u\n", len, recvd);
+ return -EIO;
+ }
+
+ /* NULL terminate the string we got */
+ kaddr = (char*)kmap_atomic(rcvbuf->pages[0], KM_USER0);
+ kaddr[len+rcvbuf->page_base] = '\0';
+ kunmap_atomic(kaddr, KM_USER0);
+ return 0;
+}
+
+/*
+ * Decode READ reply
+ */
+static int
+nfs3_xdr_readres(struct rpc_rqst *req, u32 *p, struct nfs_readres *res)
+{
+ struct kvec *iov = req->rq_rcv_buf.head;
+ int status, count, ocount, recvd, hdrlen;
+
+ status = ntohl(*p++);
+ p = xdr_decode_post_op_attr(p, res->fattr);
+
+ if (status != 0)
+ return -nfs_stat_to_errno(status);
+
+ /* Decode reply could and EOF flag. NFSv3 is somewhat redundant
+ * in that it puts the count both in the res struct and in the
+ * opaque data count. */
+ count = ntohl(*p++);
+ res->eof = ntohl(*p++);
+ ocount = ntohl(*p++);
+
+ if (ocount != count) {
+ printk(KERN_WARNING "NFS: READ count doesn't match RPC opaque count.\n");
+ return -errno_NFSERR_IO;
+ }
+
+ hdrlen = (u8 *) p - (u8 *) iov->iov_base;
+ if (iov->iov_len < hdrlen) {
+ printk(KERN_WARNING "NFS: READ reply header overflowed:"
+ "length %d > %Zu\n", hdrlen, iov->iov_len);
+ return -errno_NFSERR_IO;
+ } else if (iov->iov_len != hdrlen) {
+ dprintk("NFS: READ header is short. iovec will be shifted.\n");
+ xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
+ }
+
+ recvd = req->rq_rcv_buf.len - hdrlen;
+ if (count > recvd) {
+ printk(KERN_WARNING "NFS: server cheating in read reply: "
+ "count %d > recvd %d\n", count, recvd);
+ count = recvd;
+ res->eof = 0;
+ }
+
+ if (count < res->count)
+ res->count = count;
+
+ return count;
+}
+
+/*
+ * Decode WRITE response
+ */
+static int
+nfs3_xdr_writeres(struct rpc_rqst *req, u32 *p, struct nfs_writeres *res)
+{
+ int status;
+
+ status = ntohl(*p++);
+ p = xdr_decode_wcc_data(p, res->fattr);
+
+ if (status != 0)
+ return -nfs_stat_to_errno(status);
+
+ res->count = ntohl(*p++);
+ res->verf->committed = (enum nfs3_stable_how)ntohl(*p++);
+ res->verf->verifier[0] = *p++;
+ res->verf->verifier[1] = *p++;
+
+ return res->count;
+}
+
+/*
+ * Decode a CREATE response
+ */
+static int
+nfs3_xdr_createres(struct rpc_rqst *req, u32 *p, struct nfs3_diropres *res)
+{
+ int status;
+
+ status = ntohl(*p++);
+ if (status == 0) {
+ if (*p++) {
+ if (!(p = xdr_decode_fhandle(p, res->fh)))
+ return -errno_NFSERR_IO;
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ } else {
+ memset(res->fh, 0, sizeof(*res->fh));
+ /* Do decode post_op_attr but set it to NULL */
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ res->fattr->valid = 0;
+ }
+ } else {
+ status = -nfs_stat_to_errno(status);
+ }
+ p = xdr_decode_wcc_data(p, res->dir_attr);
+ return status;
+}
+
+/*
+ * Decode RENAME reply
+ */
+static int
+nfs3_xdr_renameres(struct rpc_rqst *req, u32 *p, struct nfs3_renameres *res)
+{
+ int status;
+
+ if ((status = ntohl(*p++)) != 0)
+ status = -nfs_stat_to_errno(status);
+ p = xdr_decode_wcc_data(p, res->fromattr);
+ p = xdr_decode_wcc_data(p, res->toattr);
+ return status;
+}
+
+/*
+ * Decode LINK reply
+ */
+static int
+nfs3_xdr_linkres(struct rpc_rqst *req, u32 *p, struct nfs3_linkres *res)
+{
+ int status;
+
+ if ((status = ntohl(*p++)) != 0)
+ status = -nfs_stat_to_errno(status);
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ p = xdr_decode_wcc_data(p, res->dir_attr);
+ return status;
+}
+
+/*
+ * Decode FSSTAT reply
+ */
+static int
+nfs3_xdr_fsstatres(struct rpc_rqst *req, u32 *p, struct nfs_fsstat *res)
+{
+ int status;
+
+ status = ntohl(*p++);
+
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ if (status != 0)
+ return -nfs_stat_to_errno(status);
+
+ p = xdr_decode_hyper(p, &res->tbytes);
+ p = xdr_decode_hyper(p, &res->fbytes);
+ p = xdr_decode_hyper(p, &res->abytes);
+ p = xdr_decode_hyper(p, &res->tfiles);
+ p = xdr_decode_hyper(p, &res->ffiles);
+ p = xdr_decode_hyper(p, &res->afiles);
+
+ /* ignore invarsec */
+ return 0;
+}
+
+/*
+ * Decode FSINFO reply
+ */
+static int
+nfs3_xdr_fsinfores(struct rpc_rqst *req, u32 *p, struct nfs_fsinfo *res)
+{
+ int status;
+
+ status = ntohl(*p++);
+
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ if (status != 0)
+ return -nfs_stat_to_errno(status);
+
+ res->rtmax = ntohl(*p++);
+ res->rtpref = ntohl(*p++);
+ res->rtmult = ntohl(*p++);
+ res->wtmax = ntohl(*p++);
+ res->wtpref = ntohl(*p++);
+ res->wtmult = ntohl(*p++);
+ res->dtpref = ntohl(*p++);
+ p = xdr_decode_hyper(p, &res->maxfilesize);
+
+ /* ignore time_delta and properties */
+ res->lease_time = 0;
+ return 0;
+}
+
+/*
+ * Decode PATHCONF reply
+ */
+static int
+nfs3_xdr_pathconfres(struct rpc_rqst *req, u32 *p, struct nfs_pathconf *res)
+{
+ int status;
+
+ status = ntohl(*p++);
+
+ p = xdr_decode_post_op_attr(p, res->fattr);
+ if (status != 0)
+ return -nfs_stat_to_errno(status);
+ res->max_link = ntohl(*p++);
+ res->max_namelen = ntohl(*p++);
+
+ /* ignore remaining fields */
+ return 0;
+}
+
+/*
+ * Decode COMMIT reply
+ */
+static int
+nfs3_xdr_commitres(struct rpc_rqst *req, u32 *p, struct nfs_writeres *res)
+{
+ int status;
+
+ status = ntohl(*p++);
+ p = xdr_decode_wcc_data(p, res->fattr);
+ if (status != 0)
+ return -nfs_stat_to_errno(status);
+
+ res->verf->verifier[0] = *p++;
+ res->verf->verifier[1] = *p++;
+ return 0;
+}
+
+#ifndef MAX
+# define MAX(a, b) (((a) > (b))? (a) : (b))
+#endif
+
+#define PROC(proc, argtype, restype, timer) \
+[NFS3PROC_##proc] = { \
+ .p_proc = NFS3PROC_##proc, \
+ .p_encode = (kxdrproc_t) nfs3_xdr_##argtype, \
+ .p_decode = (kxdrproc_t) nfs3_xdr_##restype, \
+ .p_bufsiz = MAX(NFS3_##argtype##_sz,NFS3_##restype##_sz) << 2, \
+ .p_timer = timer \
+ }
+
+struct rpc_procinfo nfs3_procedures[] = {
+ PROC(GETATTR, fhandle, attrstat, 1),
+ PROC(SETATTR, sattrargs, wccstat, 0),
+ PROC(LOOKUP, diropargs, lookupres, 2),
+ PROC(ACCESS, accessargs, accessres, 1),
+ PROC(READLINK, readlinkargs, readlinkres, 3),
+ PROC(READ, readargs, readres, 3),
+ PROC(WRITE, writeargs, writeres, 4),
+ PROC(CREATE, createargs, createres, 0),
+ PROC(MKDIR, mkdirargs, createres, 0),
+ PROC(SYMLINK, symlinkargs, createres, 0),
+ PROC(MKNOD, mknodargs, createres, 0),
+ PROC(REMOVE, diropargs, wccstat, 0),
+ PROC(RMDIR, diropargs, wccstat, 0),
+ PROC(RENAME, renameargs, renameres, 0),
+ PROC(LINK, linkargs, linkres, 0),
+ PROC(READDIR, readdirargs, readdirres, 3),
+ PROC(READDIRPLUS, readdirargs, readdirres, 3),
+ PROC(FSSTAT, fhandle, fsstatres, 0),
+ PROC(FSINFO, fhandle, fsinfores, 0),
+ PROC(PATHCONF, fhandle, pathconfres, 0),
+ PROC(COMMIT, commitargs, commitres, 5),
+};
+
+struct rpc_version nfs_version3 = {
+ .number = 3,
+ .nrprocs = sizeof(nfs3_procedures)/sizeof(nfs3_procedures[0]),
+ .procs = nfs3_procedures
+};
+