1 /* 2 * linux/fs/nfs/mount_clnt.c 3 * 4 * MOUNT client to support NFSroot. 5 * 6 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/socket.h> 11 #include <linux/kernel.h> 12 #include <linux/errno.h> 13 #include <linux/uio.h> 14 #include <linux/net.h> 15 #include <linux/in.h> 16 #include <linux/sunrpc/clnt.h> 17 #include <linux/sunrpc/xprt.h> 18 #include <linux/sunrpc/sched.h> 19 #include <linux/nfs_fs.h> 20 21 #ifdef RPC_DEBUG 22 # define NFSDBG_FACILITY NFSDBG_ROOT 23 #endif 24 25 /* 26 #define MOUNT_PROGRAM 100005 27 #define MOUNT_VERSION 1 28 #define MOUNT_MNT 1 29 #define MOUNT_UMNT 3 30 */ 31 32 static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *, 33 int, int); 34 static struct rpc_program mnt_program; 35 36 struct mnt_fhstatus { 37 unsigned int status; 38 struct nfs_fh * fh; 39 }; 40 41 /* 42 * Obtain an NFS file handle for the given host and path 43 */ 44 int 45 nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh, 46 int version, int protocol) 47 { 48 struct rpc_clnt *mnt_clnt; 49 struct mnt_fhstatus result = { 50 .fh = fh 51 }; 52 struct rpc_message msg = { 53 .rpc_argp = path, 54 .rpc_resp = &result, 55 }; 56 char hostname[32]; 57 int status; 58 59 dprintk("NFS: nfs_mount(%08x:%s)\n", 60 (unsigned)ntohl(addr->sin_addr.s_addr), path); 61 62 sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr)); 63 mnt_clnt = mnt_create(hostname, addr, version, protocol); 64 if (IS_ERR(mnt_clnt)) 65 return PTR_ERR(mnt_clnt); 66 67 if (version == NFS_MNT3_VERSION) 68 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; 69 else 70 msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT]; 71 72 status = rpc_call_sync(mnt_clnt, &msg, 0); 73 return status < 0? status : (result.status? -EACCES : 0); 74 } 75 76 static struct rpc_clnt * 77 mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version, 78 int protocol) 79 { 80 struct rpc_xprt *xprt; 81 struct rpc_clnt *clnt; 82 83 xprt = xprt_create_proto(protocol, srvaddr, NULL); 84 if (IS_ERR(xprt)) 85 return (struct rpc_clnt *)xprt; 86 87 clnt = rpc_create_client(xprt, hostname, 88 &mnt_program, version, 89 RPC_AUTH_UNIX); 90 if (!IS_ERR(clnt)) { 91 clnt->cl_softrtry = 1; 92 clnt->cl_oneshot = 1; 93 clnt->cl_intr = 1; 94 } 95 return clnt; 96 } 97 98 /* 99 * XDR encode/decode functions for MOUNT 100 */ 101 static int 102 xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path) 103 { 104 p = xdr_encode_string(p, path); 105 106 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 107 return 0; 108 } 109 110 static int 111 xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res) 112 { 113 struct nfs_fh *fh = res->fh; 114 115 if ((res->status = ntohl(*p++)) == 0) { 116 fh->size = NFS2_FHSIZE; 117 memcpy(fh->data, p, NFS2_FHSIZE); 118 } 119 return 0; 120 } 121 122 static int 123 xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res) 124 { 125 struct nfs_fh *fh = res->fh; 126 127 if ((res->status = ntohl(*p++)) == 0) { 128 int size = ntohl(*p++); 129 if (size <= NFS3_FHSIZE) { 130 fh->size = size; 131 memcpy(fh->data, p, size); 132 } else 133 res->status = -EBADHANDLE; 134 } 135 return 0; 136 } 137 138 #define MNT_dirpath_sz (1 + 256) 139 #define MNT_fhstatus_sz (1 + 8) 140 141 static struct rpc_procinfo mnt_procedures[] = { 142 [MNTPROC_MNT] = { 143 .p_proc = MNTPROC_MNT, 144 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 145 .p_decode = (kxdrproc_t) xdr_decode_fhstatus, 146 .p_bufsiz = MNT_dirpath_sz << 2, 147 .p_statidx = MNTPROC_MNT, 148 .p_name = "MOUNT", 149 }, 150 }; 151 152 static struct rpc_procinfo mnt3_procedures[] = { 153 [MOUNTPROC3_MNT] = { 154 .p_proc = MOUNTPROC3_MNT, 155 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 156 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3, 157 .p_bufsiz = MNT_dirpath_sz << 2, 158 .p_statidx = MOUNTPROC3_MNT, 159 .p_name = "MOUNT", 160 }, 161 }; 162 163 164 static struct rpc_version mnt_version1 = { 165 .number = 1, 166 .nrprocs = 2, 167 .procs = mnt_procedures 168 }; 169 170 static struct rpc_version mnt_version3 = { 171 .number = 3, 172 .nrprocs = 2, 173 .procs = mnt3_procedures 174 }; 175 176 static struct rpc_version * mnt_version[] = { 177 NULL, 178 &mnt_version1, 179 NULL, 180 &mnt_version3, 181 }; 182 183 static struct rpc_stat mnt_stats; 184 185 static struct rpc_program mnt_program = { 186 .name = "mount", 187 .number = NFS_MNT_PROGRAM, 188 .nrvers = ARRAY_SIZE(mnt_version), 189 .version = mnt_version, 190 .stats = &mnt_stats, 191 }; 192