NFS: Add a lookupfh NFS RPC op
Add a lookup filehandle NFS RPC op so that a file handle can be looked up without requiring dentries and inodes and other VFS stuff when doing an NFS4 pathwalk during mounting. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -1583,6 +1583,52 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
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return status;
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}
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static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
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struct qstr *name, struct nfs_fh *fhandle,
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struct nfs_fattr *fattr)
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{
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int status;
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struct nfs4_lookup_arg args = {
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.bitmask = server->attr_bitmask,
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.dir_fh = dirfh,
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.name = name,
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};
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struct nfs4_lookup_res res = {
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.server = server,
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.fattr = fattr,
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.fh = fhandle,
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
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.rpc_argp = &args,
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.rpc_resp = &res,
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};
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nfs_fattr_init(fattr);
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dprintk("NFS call lookupfh %s\n", name->name);
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status = rpc_call_sync(server->client, &msg, 0);
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dprintk("NFS reply lookupfh: %d\n", status);
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if (status == -NFS4ERR_MOVED)
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status = -EREMOTE;
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return status;
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}
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static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
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struct qstr *name, struct nfs_fh *fhandle,
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struct nfs_fattr *fattr)
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{
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struct nfs4_exception exception = { };
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int err;
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do {
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err = nfs4_handle_exception(server,
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_nfs4_proc_lookupfh(server, dirfh, name,
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fhandle, fattr),
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&exception);
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} while (exception.retry);
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return err;
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}
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static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
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struct nfs_fh *fhandle, struct nfs_fattr *fattr)
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{
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@ -3723,6 +3769,7 @@ struct nfs_rpc_ops nfs_v4_clientops = {
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.getroot = nfs4_proc_get_root,
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.getattr = nfs4_proc_getattr,
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.setattr = nfs4_proc_setattr,
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.lookupfh = nfs4_proc_lookupfh,
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.lookup = nfs4_proc_lookup,
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.access = nfs4_proc_access,
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.readlink = nfs4_proc_readlink,
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@ -770,6 +770,9 @@ struct nfs_rpc_ops {
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int (*getroot) (struct nfs_server *, struct nfs_fh *,
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struct nfs_fsinfo *);
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int (*lookupfh)(struct nfs_server *, struct nfs_fh *,
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struct qstr *, struct nfs_fh *,
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struct nfs_fattr *);
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int (*getattr) (struct nfs_server *, struct nfs_fh *,
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struct nfs_fattr *);
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int (*setattr) (struct dentry *, struct nfs_fattr *,
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