/*
- * linux/fs/nfs/mount_clnt.c
- *
- * MOUNT client to support NFSroot.
+ * In-kernel MOUNT protocol client
*
* Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/net.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
-#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/sched.h>
#include <linux/nfs_fs.h>
+#include "internal.h"
#ifdef RPC_DEBUG
-# define NFSDBG_FACILITY NFSDBG_ROOT
+# define NFSDBG_FACILITY NFSDBG_MOUNT
#endif
/*
-#define MOUNT_PROGRAM 100005
-#define MOUNT_VERSION 1
-#define MOUNT_MNT 1
-#define MOUNT_UMNT 3
+ * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
+ */
+#define MNTPATHLEN (1024)
+
+/*
+ * XDR data type sizes
+ */
+#define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN))
+#define MNT_status_sz (1)
+#define MNT_fhs_status_sz (1)
+#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE)
+#define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE))
+
+/*
+ * XDR argument and result sizes
+ */
+#define MNT_enc_dirpath_sz encode_dirpath_sz
+
+/*
+ * Defined by RFC 1094, section A.5
+ */
+enum {
+ MOUNTPROC_NULL = 0,
+ MOUNTPROC_MNT = 1,
+ MOUNTPROC_DUMP = 2,
+ MOUNTPROC_UMNT = 3,
+ MOUNTPROC_UMNTALL = 4,
+ MOUNTPROC_EXPORT = 5,
+};
+
+/*
+ * Defined by RFC 1813, section 5.2
*/
+enum {
+ MOUNTPROC3_NULL = 0,
+ MOUNTPROC3_MNT = 1,
+ MOUNTPROC3_DUMP = 2,
+ MOUNTPROC3_UMNT = 3,
+ MOUNTPROC3_UMNTALL = 4,
+ MOUNTPROC3_EXPORT = 5,
+};
-static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *,
- int, int);
static struct rpc_program mnt_program;
-struct mnt_fhstatus {
- unsigned int status;
- struct nfs_fh * fh;
+/*
+ * Defined by OpenGroup XNFS Version 3W, chapter 8
+ */
+enum mountstat {
+ MNT_OK = 0,
+ MNT_EPERM = 1,
+ MNT_ENOENT = 2,
+ MNT_EACCES = 13,
+ MNT_EINVAL = 22,
+};
+
+static struct {
+ u32 status;
+ int errno;
+} mnt_errtbl[] = {
+ { .status = MNT_OK, .errno = 0, },
+ { .status = MNT_EPERM, .errno = -EPERM, },
+ { .status = MNT_ENOENT, .errno = -ENOENT, },
+ { .status = MNT_EACCES, .errno = -EACCES, },
+ { .status = MNT_EINVAL, .errno = -EINVAL, },
};
/*
- * Obtain an NFS file handle for the given host and path
+ * Defined by RFC 1813, section 5.1.5
+ */
+enum mountstat3 {
+ MNT3_OK = 0, /* no error */
+ MNT3ERR_PERM = 1, /* Not owner */
+ MNT3ERR_NOENT = 2, /* No such file or directory */
+ MNT3ERR_IO = 5, /* I/O error */
+ MNT3ERR_ACCES = 13, /* Permission denied */
+ MNT3ERR_NOTDIR = 20, /* Not a directory */
+ MNT3ERR_INVAL = 22, /* Invalid argument */
+ MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
+ MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
+ MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
+};
+
+static struct {
+ u32 status;
+ int errno;
+} mnt3_errtbl[] = {
+ { .status = MNT3_OK, .errno = 0, },
+ { .status = MNT3ERR_PERM, .errno = -EPERM, },
+ { .status = MNT3ERR_NOENT, .errno = -ENOENT, },
+ { .status = MNT3ERR_IO, .errno = -EIO, },
+ { .status = MNT3ERR_ACCES, .errno = -EACCES, },
+ { .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
+ { .status = MNT3ERR_INVAL, .errno = -EINVAL, },
+ { .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
+ { .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
+ { .status = MNT3ERR_SERVERFAULT, .errno = -ESERVERFAULT, },
+};
+
+struct mountres {
+ int errno;
+ struct nfs_fh *fh;
+};
+
+struct mnt_fhstatus {
+ u32 status;
+ struct nfs_fh *fh;
+};
+
+/**
+ * nfs_mount - Obtain an NFS file handle for the given host and path
+ * @info: pointer to mount request arguments
+ *
+ * Uses default timeout parameters specified by underlying transport.
*/
-int
-nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
- int version, int protocol)
+int nfs_mount(struct nfs_mount_request *info)
{
- struct rpc_clnt *mnt_clnt;
struct mnt_fhstatus result = {
- .fh = fh
+ .fh = info->fh
+ };
+ struct rpc_message msg = {
+ .rpc_argp = info->dirpath,
+ .rpc_resp = &result,
};
- char hostname[32];
+ struct rpc_create_args args = {
+ .protocol = info->protocol,
+ .address = info->sap,
+ .addrsize = info->salen,
+ .servername = info->hostname,
+ .program = &mnt_program,
+ .version = info->version,
+ .authflavor = RPC_AUTH_UNIX,
+ };
+ struct rpc_clnt *mnt_clnt;
int status;
- int call;
- dprintk("NFS: nfs_mount(%08x:%s)\n",
- (unsigned)ntohl(addr->sin_addr.s_addr), path);
+ dprintk("NFS: sending MNT request for %s:%s\n",
+ (info->hostname ? info->hostname : "server"),
+ info->dirpath);
+
+ if (info->noresvport)
+ args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
- sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
- mnt_clnt = mnt_create(hostname, addr, version, protocol);
+ mnt_clnt = rpc_create(&args);
if (IS_ERR(mnt_clnt))
- return PTR_ERR(mnt_clnt);
+ goto out_clnt_err;
- call = (version == NFS_MNT3_VERSION) ? MOUNTPROC3_MNT : MNTPROC_MNT;
- status = rpc_call(mnt_clnt, call, path, &result, 0);
- return status < 0? status : (result.status? -EACCES : 0);
-}
+ if (info->version == NFS_MNT3_VERSION)
+ msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
+ else
+ msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
-static struct rpc_clnt *
-mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version,
- int protocol)
-{
- struct rpc_xprt *xprt;
- struct rpc_clnt *clnt;
-
- xprt = xprt_create_proto(protocol, srvaddr, NULL);
- if (IS_ERR(xprt))
- return (struct rpc_clnt *)xprt;
-
- clnt = rpc_create_client(xprt, hostname,
- &mnt_program, version,
- RPC_AUTH_UNIX);
- if (!IS_ERR(clnt)) {
- clnt->cl_softrtry = 1;
- clnt->cl_chatty = 1;
- clnt->cl_oneshot = 1;
- clnt->cl_intr = 1;
- }
- return clnt;
+ status = rpc_call_sync(mnt_clnt, &msg, 0);
+ rpc_shutdown_client(mnt_clnt);
+
+ if (status < 0)
+ goto out_call_err;
+ if (result.status != 0)
+ goto out_mnt_err;
+
+ dprintk("NFS: MNT request succeeded\n");
+ status = 0;
+
+out:
+ return status;
+
+out_clnt_err:
+ status = PTR_ERR(mnt_clnt);
+ dprintk("NFS: failed to create RPC client, status=%d\n", status);
+ goto out;
+
+out_call_err:
+ dprintk("NFS: failed to start MNT request, status=%d\n", status);
+ goto out;
+
+out_mnt_err:
+ dprintk("NFS: MNT server returned result %d\n", result.status);
+ status = nfs_stat_to_errno(result.status);
+ goto out;
}
/*
* XDR encode/decode functions for MOUNT
*/
-static int
-xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path)
+
+static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
{
- p = xdr_encode_string(p, path);
+ const u32 pathname_len = strlen(pathname);
+ __be32 *p;
+
+ if (unlikely(pathname_len > MNTPATHLEN))
+ return -EIO;
+
+ p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);
+ if (unlikely(p == NULL))
+ return -EIO;
+ xdr_encode_opaque(p, pathname, pathname_len);
- req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
-static int
-xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
+static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p,
+ const char *dirpath)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ return encode_mntdirpath(&xdr, dirpath);
+}
+
+static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p,
+ struct mnt_fhstatus *res)
{
struct nfs_fh *fh = res->fh;
return 0;
}
-static int
-xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
+/*
+ * RFC 1094: "A non-zero status indicates some sort of error. In this
+ * case, the status is a UNIX error number." This can be problematic
+ * if the server and client use different errno values for the same
+ * error.
+ *
+ * However, the OpenGroup XNFS spec provides a simple mapping that is
+ * independent of local errno values on the server and the client.
+ */
+static int decode_status(struct xdr_stream *xdr, struct mountres *res)
+{
+ unsigned int i;
+ u32 status;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, sizeof(status));
+ if (unlikely(p == NULL))
+ return -EIO;
+ status = ntohl(*p);
+
+ for (i = 0; i <= ARRAY_SIZE(mnt_errtbl); i++) {
+ if (mnt_errtbl[i].status == status) {
+ res->errno = mnt_errtbl[i].errno;
+ return 0;
+ }
+ }
+
+ dprintk("NFS: unrecognized MNT status code: %u\n", status);
+ res->errno = -EACCES;
+ return 0;
+}
+
+static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res)
+{
+ struct nfs_fh *fh = res->fh;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, NFS2_FHSIZE);
+ if (unlikely(p == NULL))
+ return -EIO;
+
+ fh->size = NFS2_FHSIZE;
+ memcpy(fh->data, p, NFS2_FHSIZE);
+ return 0;
+}
+
+static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
+{
+ unsigned int i;
+ u32 status;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, sizeof(status));
+ if (unlikely(p == NULL))
+ return -EIO;
+ status = ntohl(*p);
+
+ for (i = 0; i <= ARRAY_SIZE(mnt3_errtbl); i++) {
+ if (mnt3_errtbl[i].status == status) {
+ res->errno = mnt3_errtbl[i].errno;
+ return 0;
+ }
+ }
+
+ dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
+ res->errno = -EACCES;
+ return 0;
+}
+
+static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
+{
+ struct nfs_fh *fh = res->fh;
+ u32 size;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, sizeof(size));
+ if (unlikely(p == NULL))
+ return -EIO;
+
+ size = ntohl(*p++);
+ if (size > NFS3_FHSIZE || size == 0)
+ return -EIO;
+
+ p = xdr_inline_decode(xdr, size);
+ if (unlikely(p == NULL))
+ return -EIO;
+
+ fh->size = size;
+ memcpy(fh->data, p, size);
+ return 0;
+}
+
+static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
+ struct mnt_fhstatus *res)
{
struct nfs_fh *fh = res->fh;
+ unsigned size;
if ((res->status = ntohl(*p++)) == 0) {
- int size = ntohl(*p++);
- if (size <= NFS3_FHSIZE) {
+ size = ntohl(*p++);
+ if (size <= NFS3_FHSIZE && size != 0) {
fh->size = size;
memcpy(fh->data, p, size);
} else
return 0;
}
-#define MNT_dirpath_sz (1 + 256)
#define MNT_fhstatus_sz (1 + 8)
+#define MNT_fhstatus3_sz (1 + 16)
-static struct rpc_procinfo mnt_procedures[] = {
-[MNTPROC_MNT] = {
- .p_proc = MNTPROC_MNT,
- .p_encode = (kxdrproc_t) xdr_encode_dirpath,
- .p_decode = (kxdrproc_t) xdr_decode_fhstatus,
- .p_bufsiz = MNT_dirpath_sz << 2,
+static struct rpc_procinfo mnt_procedures[] = {
+ [MOUNTPROC_MNT] = {
+ .p_proc = MOUNTPROC_MNT,
+ .p_encode = (kxdrproc_t)mnt_enc_dirpath,
+ .p_decode = (kxdrproc_t) xdr_decode_fhstatus,
+ .p_arglen = MNT_enc_dirpath_sz,
+ .p_replen = MNT_fhstatus_sz,
+ .p_statidx = MOUNTPROC_MNT,
+ .p_name = "MOUNT",
},
};
static struct rpc_procinfo mnt3_procedures[] = {
-[MOUNTPROC3_MNT] = {
- .p_proc = MOUNTPROC3_MNT,
- .p_encode = (kxdrproc_t) xdr_encode_dirpath,
- .p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
- .p_bufsiz = MNT_dirpath_sz << 2,
+ [MOUNTPROC3_MNT] = {
+ .p_proc = MOUNTPROC3_MNT,
+ .p_encode = (kxdrproc_t)mnt_enc_dirpath,
+ .p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
+ .p_arglen = MNT_enc_dirpath_sz,
+ .p_replen = MNT_fhstatus3_sz,
+ .p_statidx = MOUNTPROC3_MNT,
+ .p_name = "MOUNT",
},
};
-static struct rpc_version mnt_version1 = {
- .number = 1,
- .nrprocs = 2,
- .procs = mnt_procedures
+static struct rpc_version mnt_version1 = {
+ .number = 1,
+ .nrprocs = 2,
+ .procs = mnt_procedures,
};
-static struct rpc_version mnt_version3 = {
- .number = 3,
- .nrprocs = 2,
- .procs = mnt3_procedures
+static struct rpc_version mnt_version3 = {
+ .number = 3,
+ .nrprocs = 2,
+ .procs = mnt3_procedures,
};
-static struct rpc_version * mnt_version[] = {
+static struct rpc_version *mnt_version[] = {
NULL,
&mnt_version1,
NULL,
&mnt_version3,
};
-static struct rpc_stat mnt_stats;
+static struct rpc_stat mnt_stats;
-static struct rpc_program mnt_program = {
+static struct rpc_program mnt_program = {
.name = "mount",
.number = NFS_MNT_PROGRAM,
- .nrvers = sizeof(mnt_version)/sizeof(mnt_version[0]),
+ .nrvers = ARRAY_SIZE(mnt_version),
.version = mnt_version,
.stats = &mnt_stats,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff