diff options
Diffstat (limited to 'fs/nfs/mount_clnt.c')
| -rw-r--r-- | fs/nfs/mount_clnt.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c new file mode 100644 index 000000000000..9d3ddad96d9e --- /dev/null +++ b/fs/nfs/mount_clnt.c @@ -0,0 +1,183 @@ +/* + * linux/fs/nfs/mount_clnt.c + * + * MOUNT client to support NFSroot. + * + * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/uio.h> +#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> + +#ifdef RPC_DEBUG +# define NFSDBG_FACILITY NFSDBG_ROOT +#endif + +/* +#define MOUNT_PROGRAM 100005 +#define MOUNT_VERSION 1 +#define MOUNT_MNT 1 +#define MOUNT_UMNT 3 + */ + +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; +}; + +/* + * Obtain an NFS file handle for the given host and path + */ +int +nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh, + int version, int protocol) +{ + struct rpc_clnt *mnt_clnt; + struct mnt_fhstatus result = { + .fh = fh + }; + char hostname[32]; + int status; + int call; + + dprintk("NFS: nfs_mount(%08x:%s)\n", + (unsigned)ntohl(addr->sin_addr.s_addr), path); + + sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr)); + mnt_clnt = mnt_create(hostname, addr, version, protocol); + if (IS_ERR(mnt_clnt)) + return PTR_ERR(mnt_clnt); + + 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); +} + +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)) { + xprt_destroy(xprt); + } else { + clnt->cl_softrtry = 1; + clnt->cl_chatty = 1; + clnt->cl_oneshot = 1; + clnt->cl_intr = 1; + } + return clnt; +} + +/* + * XDR encode/decode functions for MOUNT + */ +static int +xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path) +{ + p = xdr_encode_string(p, path); + + 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) +{ + struct nfs_fh *fh = res->fh; + + if ((res->status = ntohl(*p++)) == 0) { + fh->size = NFS2_FHSIZE; + memcpy(fh->data, p, NFS2_FHSIZE); + } + return 0; +} + +static int +xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res) +{ + struct nfs_fh *fh = res->fh; + + if ((res->status = ntohl(*p++)) == 0) { + int size = ntohl(*p++); + if (size <= NFS3_FHSIZE) { + fh->size = size; + memcpy(fh->data, p, size); + } else + res->status = -EBADHANDLE; + } + return 0; +} + +#define MNT_dirpath_sz (1 + 256) +#define MNT_fhstatus_sz (1 + 8) + +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 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, + }, +}; + + +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_version[] = { + NULL, + &mnt_version1, + NULL, + &mnt_version3, +}; + +static struct rpc_stat mnt_stats; + +static struct rpc_program mnt_program = { + .name = "mount", + .number = NFS_MNT_PROGRAM, + .nrvers = sizeof(mnt_version)/sizeof(mnt_version[0]), + .version = mnt_version, + .stats = &mnt_stats, +}; |