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 char hostname[32]; 53 int status; 54 int call; 55 56 dprintk("NFS: nfs_mount(%08x:%s)\n", 57 (unsigned)ntohl(addr->sin_addr.s_addr), path); 58 59 sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr)); 60 mnt_clnt = mnt_create(hostname, addr, version, protocol); 61 if (IS_ERR(mnt_clnt)) 62 return PTR_ERR(mnt_clnt); 63 64 call = (version == NFS_MNT3_VERSION) ? MOUNTPROC3_MNT : MNTPROC_MNT; 65 status = rpc_call(mnt_clnt, call, path, &result, 0); 66 return status < 0? status : (result.status? -EACCES : 0); 67 } 68 69 static struct rpc_clnt * 70 mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version, 71 int protocol) 72 { 73 struct rpc_xprt *xprt; 74 struct rpc_clnt *clnt; 75 76 xprt = xprt_create_proto(protocol, srvaddr, NULL); 77 if (IS_ERR(xprt)) 78 return (struct rpc_clnt *)xprt; 79 80 clnt = rpc_create_client(xprt, hostname, 81 &mnt_program, version, 82 RPC_AUTH_UNIX); 83 if (IS_ERR(clnt)) { 84 xprt_destroy(xprt); 85 } else { 86 clnt->cl_softrtry = 1; 87 clnt->cl_chatty = 1; 88 clnt->cl_oneshot = 1; 89 clnt->cl_intr = 1; 90 } 91 return clnt; 92 } 93 94 /* 95 * XDR encode/decode functions for MOUNT 96 */ 97 static int 98 xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path) 99 { 100 p = xdr_encode_string(p, path); 101 102 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 103 return 0; 104 } 105 106 static int 107 xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res) 108 { 109 struct nfs_fh *fh = res->fh; 110 111 if ((res->status = ntohl(*p++)) == 0) { 112 fh->size = NFS2_FHSIZE; 113 memcpy(fh->data, p, NFS2_FHSIZE); 114 } 115 return 0; 116 } 117 118 static int 119 xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res) 120 { 121 struct nfs_fh *fh = res->fh; 122 123 if ((res->status = ntohl(*p++)) == 0) { 124 int size = ntohl(*p++); 125 if (size <= NFS3_FHSIZE) { 126 fh->size = size; 127 memcpy(fh->data, p, size); 128 } else 129 res->status = -EBADHANDLE; 130 } 131 return 0; 132 } 133 134 #define MNT_dirpath_sz (1 + 256) 135 #define MNT_fhstatus_sz (1 + 8) 136 137 static struct rpc_procinfo mnt_procedures[] = { 138 [MNTPROC_MNT] = { 139 .p_proc = MNTPROC_MNT, 140 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 141 .p_decode = (kxdrproc_t) xdr_decode_fhstatus, 142 .p_bufsiz = MNT_dirpath_sz << 2, 143 }, 144 }; 145 146 static struct rpc_procinfo mnt3_procedures[] = { 147 [MOUNTPROC3_MNT] = { 148 .p_proc = MOUNTPROC3_MNT, 149 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 150 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3, 151 .p_bufsiz = MNT_dirpath_sz << 2, 152 }, 153 }; 154 155 156 static struct rpc_version mnt_version1 = { 157 .number = 1, 158 .nrprocs = 2, 159 .procs = mnt_procedures 160 }; 161 162 static struct rpc_version mnt_version3 = { 163 .number = 3, 164 .nrprocs = 2, 165 .procs = mnt3_procedures 166 }; 167 168 static struct rpc_version * mnt_version[] = { 169 NULL, 170 &mnt_version1, 171 NULL, 172 &mnt_version3, 173 }; 174 175 static struct rpc_stat mnt_stats; 176 177 static struct rpc_program mnt_program = { 178 .name = "mount", 179 .number = NFS_MNT_PROGRAM, 180 .nrvers = sizeof(mnt_version)/sizeof(mnt_version[0]), 181 .version = mnt_version, 182 .stats = &mnt_stats, 183 }; 184