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 clnt->cl_softrtry = 1; 85 clnt->cl_oneshot = 1; 86 clnt->cl_intr = 1; 87 } 88 return clnt; 89 } 90 91 /* 92 * XDR encode/decode functions for MOUNT 93 */ 94 static int 95 xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path) 96 { 97 p = xdr_encode_string(p, path); 98 99 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 100 return 0; 101 } 102 103 static int 104 xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res) 105 { 106 struct nfs_fh *fh = res->fh; 107 108 if ((res->status = ntohl(*p++)) == 0) { 109 fh->size = NFS2_FHSIZE; 110 memcpy(fh->data, p, NFS2_FHSIZE); 111 } 112 return 0; 113 } 114 115 static int 116 xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res) 117 { 118 struct nfs_fh *fh = res->fh; 119 120 if ((res->status = ntohl(*p++)) == 0) { 121 int size = ntohl(*p++); 122 if (size <= NFS3_FHSIZE) { 123 fh->size = size; 124 memcpy(fh->data, p, size); 125 } else 126 res->status = -EBADHANDLE; 127 } 128 return 0; 129 } 130 131 #define MNT_dirpath_sz (1 + 256) 132 #define MNT_fhstatus_sz (1 + 8) 133 134 static struct rpc_procinfo mnt_procedures[] = { 135 [MNTPROC_MNT] = { 136 .p_proc = MNTPROC_MNT, 137 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 138 .p_decode = (kxdrproc_t) xdr_decode_fhstatus, 139 .p_bufsiz = MNT_dirpath_sz << 2, 140 }, 141 }; 142 143 static struct rpc_procinfo mnt3_procedures[] = { 144 [MOUNTPROC3_MNT] = { 145 .p_proc = MOUNTPROC3_MNT, 146 .p_encode = (kxdrproc_t) xdr_encode_dirpath, 147 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3, 148 .p_bufsiz = MNT_dirpath_sz << 2, 149 }, 150 }; 151 152 153 static struct rpc_version mnt_version1 = { 154 .number = 1, 155 .nrprocs = 2, 156 .procs = mnt_procedures 157 }; 158 159 static struct rpc_version mnt_version3 = { 160 .number = 3, 161 .nrprocs = 2, 162 .procs = mnt3_procedures 163 }; 164 165 static struct rpc_version * mnt_version[] = { 166 NULL, 167 &mnt_version1, 168 NULL, 169 &mnt_version3, 170 }; 171 172 static struct rpc_stat mnt_stats; 173 174 static struct rpc_program mnt_program = { 175 .name = "mount", 176 .number = NFS_MNT_PROGRAM, 177 .nrvers = sizeof(mnt_version)/sizeof(mnt_version[0]), 178 .version = mnt_version, 179 .stats = &mnt_stats, 180 }; 181