Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 2 | * In-kernel MOUNT protocol client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/types.h> |
| 8 | #include <linux/socket.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/uio.h> |
| 12 | #include <linux/net.h> |
| 13 | #include <linux/in.h> |
| 14 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sunrpc/sched.h> |
| 16 | #include <linux/nfs_fs.h> |
| 17 | |
| 18 | #ifdef RPC_DEBUG |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 19 | # define NFSDBG_FACILITY NFSDBG_MOUNT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #endif |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | static struct rpc_program mnt_program; |
| 23 | |
| 24 | struct mnt_fhstatus { |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 25 | u32 status; |
| 26 | struct nfs_fh *fh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | }; |
| 28 | |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 29 | /** |
| 30 | * nfs_mount - Obtain an NFS file handle for the given host and path |
| 31 | * @addr: pointer to server's address |
| 32 | * @len: size of server's address |
| 33 | * @hostname: name of server host, or NULL |
| 34 | * @path: pointer to string containing export path to mount |
| 35 | * @version: mount version to use for this request |
| 36 | * @protocol: transport protocol to use for thie request |
| 37 | * @fh: pointer to location to place returned file handle |
| 38 | * |
| 39 | * Uses default timeout parameters specified by underlying transport. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | */ |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 41 | int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path, |
| 42 | int version, int protocol, struct nfs_fh *fh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | struct mnt_fhstatus result = { |
| 45 | .fh = fh |
| 46 | }; |
Chuck Lever | dead28d | 2006-03-20 13:44:23 -0500 | [diff] [blame] | 47 | struct rpc_message msg = { |
| 48 | .rpc_argp = path, |
| 49 | .rpc_resp = &result, |
| 50 | }; |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 51 | struct rpc_create_args args = { |
| 52 | .protocol = protocol, |
| 53 | .address = addr, |
| 54 | .addrsize = len, |
| 55 | .servername = hostname, |
| 56 | .program = &mnt_program, |
| 57 | .version = version, |
| 58 | .authflavor = RPC_AUTH_UNIX, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 59 | .flags = 0, |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 60 | }; |
| 61 | struct rpc_clnt *mnt_clnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 64 | dprintk("NFS: sending MNT request for %s:%s\n", |
| 65 | (hostname ? hostname : "server"), path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 67 | mnt_clnt = rpc_create(&args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | if (IS_ERR(mnt_clnt)) |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 69 | goto out_clnt_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
Chuck Lever | dead28d | 2006-03-20 13:44:23 -0500 | [diff] [blame] | 71 | if (version == NFS_MNT3_VERSION) |
| 72 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; |
| 73 | else |
| 74 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT]; |
| 75 | |
| 76 | status = rpc_call_sync(mnt_clnt, &msg, 0); |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 77 | rpc_shutdown_client(mnt_clnt); |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 78 | |
| 79 | if (status < 0) |
| 80 | goto out_call_err; |
| 81 | if (result.status != 0) |
| 82 | goto out_mnt_err; |
| 83 | |
| 84 | dprintk("NFS: MNT request succeeded\n"); |
| 85 | status = 0; |
| 86 | |
| 87 | out: |
| 88 | return status; |
| 89 | |
| 90 | out_clnt_err: |
| 91 | status = PTR_ERR(mnt_clnt); |
| 92 | dprintk("NFS: failed to create RPC client, status=%d\n", status); |
| 93 | goto out; |
| 94 | |
| 95 | out_call_err: |
| 96 | dprintk("NFS: failed to start MNT request, status=%d\n", status); |
| 97 | goto out; |
| 98 | |
| 99 | out_mnt_err: |
| 100 | dprintk("NFS: MNT server returned result %d\n", result.status); |
| 101 | status = -EACCES; |
| 102 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | /* |
| 106 | * XDR encode/decode functions for MOUNT |
| 107 | */ |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 108 | static int xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p, |
| 109 | const char *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | { |
| 111 | p = xdr_encode_string(p, path); |
| 112 | |
| 113 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); |
| 114 | return 0; |
| 115 | } |
| 116 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 117 | static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p, |
| 118 | struct mnt_fhstatus *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
| 120 | struct nfs_fh *fh = res->fh; |
| 121 | |
| 122 | if ((res->status = ntohl(*p++)) == 0) { |
| 123 | fh->size = NFS2_FHSIZE; |
| 124 | memcpy(fh->data, p, NFS2_FHSIZE); |
| 125 | } |
| 126 | return 0; |
| 127 | } |
| 128 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 129 | static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, |
| 130 | struct mnt_fhstatus *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
| 132 | struct nfs_fh *fh = res->fh; |
Trond Myklebust | b7e2445 | 2008-06-19 15:21:11 -0400 | [diff] [blame^] | 133 | unsigned size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | if ((res->status = ntohl(*p++)) == 0) { |
Trond Myklebust | b7e2445 | 2008-06-19 15:21:11 -0400 | [diff] [blame^] | 136 | size = ntohl(*p++); |
| 137 | if (size <= NFS3_FHSIZE && size != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | fh->size = size; |
| 139 | memcpy(fh->data, p, size); |
| 140 | } else |
| 141 | res->status = -EBADHANDLE; |
| 142 | } |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | #define MNT_dirpath_sz (1 + 256) |
| 147 | #define MNT_fhstatus_sz (1 + 8) |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 148 | #define MNT_fhstatus3_sz (1 + 16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 150 | static struct rpc_procinfo mnt_procedures[] = { |
| 151 | [MNTPROC_MNT] = { |
| 152 | .p_proc = MNTPROC_MNT, |
| 153 | .p_encode = (kxdrproc_t) xdr_encode_dirpath, |
| 154 | .p_decode = (kxdrproc_t) xdr_decode_fhstatus, |
| 155 | .p_arglen = MNT_dirpath_sz, |
| 156 | .p_replen = MNT_fhstatus_sz, |
| 157 | .p_statidx = MNTPROC_MNT, |
| 158 | .p_name = "MOUNT", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | }, |
| 160 | }; |
| 161 | |
| 162 | static struct rpc_procinfo mnt3_procedures[] = { |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 163 | [MOUNTPROC3_MNT] = { |
| 164 | .p_proc = MOUNTPROC3_MNT, |
| 165 | .p_encode = (kxdrproc_t) xdr_encode_dirpath, |
| 166 | .p_decode = (kxdrproc_t) xdr_decode_fhstatus3, |
| 167 | .p_arglen = MNT_dirpath_sz, |
| 168 | .p_replen = MNT_fhstatus3_sz, |
| 169 | .p_statidx = MOUNTPROC3_MNT, |
| 170 | .p_name = "MOUNT", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | }, |
| 172 | }; |
| 173 | |
| 174 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 175 | static struct rpc_version mnt_version1 = { |
| 176 | .number = 1, |
| 177 | .nrprocs = 2, |
| 178 | .procs = mnt_procedures, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | }; |
| 180 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 181 | static struct rpc_version mnt_version3 = { |
| 182 | .number = 3, |
| 183 | .nrprocs = 2, |
| 184 | .procs = mnt3_procedures, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | }; |
| 186 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 187 | static struct rpc_version *mnt_version[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | NULL, |
| 189 | &mnt_version1, |
| 190 | NULL, |
| 191 | &mnt_version3, |
| 192 | }; |
| 193 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 194 | static struct rpc_stat mnt_stats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 196 | static struct rpc_program mnt_program = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | .name = "mount", |
| 198 | .number = NFS_MNT_PROGRAM, |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 199 | .nrvers = ARRAY_SIZE(mnt_version), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | .version = mnt_version, |
| 201 | .stats = &mnt_stats, |
| 202 | }; |