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NFS: Introduce generic mount client API

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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 <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2007-07-01 12:13:49 -04:00 committed by Trond Myklebust
parent bf0fd7680f
commit 0076d7b7ba
1 changed files with 57 additions and 0 deletions
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57
fs/nfs/super.c
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@ -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