From 0076d7b7bab580ca2e94637d351fa7cd357743a8 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Sun, 1 Jul 2007 12:13:49 -0400 Subject: NFS: Introduce generic mount client API For NFSv2 and v3 mounts, the first step is to contact the server's MOUNTD and request the file handle for the root of the mounted share. Add a function to the NFS client that handles this operation. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust --- fs/nfs/super.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 7e56411e55fc..48db52a7067a 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -991,6 +991,63 @@ out_unknown: return 0; } +/* + * Use the remote server's MOUNT service to request the NFS file handle + * corresponding to the provided path. + */ +static int nfs_try_mount(struct nfs_parsed_mount_data *args, + struct nfs_fh *root_fh) +{ + struct sockaddr_in sin; + int status; + + if (args->mount_server.version == 0) { + if (args->flags & NFS_MOUNT_VER3) + args->mount_server.version = NFS_MNT3_VERSION; + else + args->mount_server.version = NFS_MNT_VERSION; + } + + /* + * Construct the mount server's address. + */ + if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY) + sin = args->mount_server.address; + else + sin = args->nfs_server.address; + if (args->mount_server.port == 0) { + status = rpcb_getport_sync(&sin, + args->mount_server.program, + args->mount_server.version, + args->mount_server.protocol); + if (status < 0) + goto out_err; + sin.sin_port = htons(status); + } else + sin.sin_port = htons(args->mount_server.port); + + /* + * Now ask the mount server to map our export path + * to a file handle. + */ + status = nfs_mount((struct sockaddr *) &sin, + sizeof(sin), + args->nfs_server.hostname, + args->nfs_server.export_path, + args->mount_server.version, + args->mount_server.protocol, + root_fh); + if (status < 0) + goto out_err; + + return status; + +out_err: + dfprintk(MOUNT, "NFS: unable to contact server on host " + NIPQUAD_FMT "\n", NIPQUAD(sin.sin_addr.s_addr)); + return status; +} + /* * Validate the NFS2/NFS3 mount data * - fills in the mount root filehandle -- cgit v1.2.2