1420 lines
35 KiB
C
1420 lines
35 KiB
C
/* client.c: NFS client sharing and management code
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*
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* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/metrics.h>
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#include <linux/sunrpc/xprtsock.h>
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#include <linux/sunrpc/xprtrdma.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/nfs4_mount.h>
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#include <linux/lockd/bind.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/nfs_idmap.h>
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#include <linux/vfs.h>
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#include <linux/inet.h>
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#include <linux/nfs_xdr.h>
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#include <asm/system.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "iostat.h"
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#include "internal.h"
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#define NFSDBG_FACILITY NFSDBG_CLIENT
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static DEFINE_SPINLOCK(nfs_client_lock);
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static LIST_HEAD(nfs_client_list);
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static LIST_HEAD(nfs_volume_list);
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static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
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/*
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* RPC cruft for NFS
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*/
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static struct rpc_version *nfs_version[5] = {
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[2] = &nfs_version2,
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#ifdef CONFIG_NFS_V3
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[3] = &nfs_version3,
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#endif
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#ifdef CONFIG_NFS_V4
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[4] = &nfs_version4,
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#endif
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};
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struct rpc_program nfs_program = {
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.name = "nfs",
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.number = NFS_PROGRAM,
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.nrvers = ARRAY_SIZE(nfs_version),
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.version = nfs_version,
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.stats = &nfs_rpcstat,
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.pipe_dir_name = "/nfs",
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};
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struct rpc_stat nfs_rpcstat = {
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.program = &nfs_program
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};
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#ifdef CONFIG_NFS_V3_ACL
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static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
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static struct rpc_version * nfsacl_version[] = {
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[3] = &nfsacl_version3,
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};
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struct rpc_program nfsacl_program = {
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.name = "nfsacl",
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.number = NFS_ACL_PROGRAM,
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.nrvers = ARRAY_SIZE(nfsacl_version),
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.version = nfsacl_version,
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.stats = &nfsacl_rpcstat,
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};
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#endif /* CONFIG_NFS_V3_ACL */
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struct nfs_client_initdata {
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const char *hostname;
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const struct sockaddr_in *addr;
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const struct nfs_rpc_ops *rpc_ops;
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};
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/*
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* Allocate a shared client record
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*
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* Since these are allocated/deallocated very rarely, we don't
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* bother putting them in a slab cache...
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*/
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static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
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{
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struct nfs_client *clp;
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if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
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goto error_0;
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clp->rpc_ops = cl_init->rpc_ops;
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if (cl_init->rpc_ops->version == 4) {
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if (nfs_callback_up() < 0)
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goto error_2;
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__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
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}
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atomic_set(&clp->cl_count, 1);
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clp->cl_cons_state = NFS_CS_INITING;
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memcpy(&clp->cl_addr, cl_init->addr, sizeof(clp->cl_addr));
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if (cl_init->hostname) {
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clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
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if (!clp->cl_hostname)
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goto error_3;
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}
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INIT_LIST_HEAD(&clp->cl_superblocks);
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clp->cl_rpcclient = ERR_PTR(-EINVAL);
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#ifdef CONFIG_NFS_V4
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init_rwsem(&clp->cl_sem);
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INIT_LIST_HEAD(&clp->cl_delegations);
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spin_lock_init(&clp->cl_lock);
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INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
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rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
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clp->cl_boot_time = CURRENT_TIME;
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clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
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#endif
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return clp;
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error_3:
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if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
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nfs_callback_down();
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error_2:
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kfree(clp);
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error_0:
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return NULL;
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}
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static void nfs4_shutdown_client(struct nfs_client *clp)
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{
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#ifdef CONFIG_NFS_V4
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if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
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nfs4_kill_renewd(clp);
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BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
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if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
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nfs_idmap_delete(clp);
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#endif
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}
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/*
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* Destroy a shared client record
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*/
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static void nfs_free_client(struct nfs_client *clp)
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{
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dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
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nfs4_shutdown_client(clp);
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/* -EIO all pending I/O */
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if (!IS_ERR(clp->cl_rpcclient))
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rpc_shutdown_client(clp->cl_rpcclient);
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if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
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nfs_callback_down();
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kfree(clp->cl_hostname);
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kfree(clp);
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dprintk("<-- nfs_free_client()\n");
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}
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/*
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* Release a reference to a shared client record
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*/
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void nfs_put_client(struct nfs_client *clp)
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{
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if (!clp)
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return;
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dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
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if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
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list_del(&clp->cl_share_link);
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spin_unlock(&nfs_client_lock);
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BUG_ON(!list_empty(&clp->cl_superblocks));
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nfs_free_client(clp);
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}
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}
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/*
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* Find a client by IP address and protocol version
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* - returns NULL if no such client
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*/
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struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
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{
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struct nfs_client *clp;
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spin_lock(&nfs_client_lock);
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list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
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/* Don't match clients that failed to initialise properly */
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if (clp->cl_cons_state != NFS_CS_READY)
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continue;
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/* Different NFS versions cannot share the same nfs_client */
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if (clp->rpc_ops->version != nfsversion)
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continue;
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/* Match only the IP address, not the port number */
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if (clp->cl_addr.sin_addr.s_addr != addr->sin_addr.s_addr)
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continue;
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atomic_inc(&clp->cl_count);
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spin_unlock(&nfs_client_lock);
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return clp;
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}
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spin_unlock(&nfs_client_lock);
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return NULL;
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}
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/*
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* Find an nfs_client on the list that matches the initialisation data
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* that is supplied.
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*/
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static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
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{
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struct nfs_client *clp;
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list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
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/* Don't match clients that failed to initialise properly */
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if (clp->cl_cons_state < 0)
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continue;
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/* Different NFS versions cannot share the same nfs_client */
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if (clp->rpc_ops != data->rpc_ops)
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continue;
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/* Match the full socket address */
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if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
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continue;
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atomic_inc(&clp->cl_count);
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return clp;
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}
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return NULL;
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}
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/*
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* Look up a client by IP address and protocol version
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* - creates a new record if one doesn't yet exist
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*/
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static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
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{
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struct nfs_client *clp, *new = NULL;
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int error;
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dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%u)\n",
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cl_init->hostname ?: "", NIPQUAD(cl_init->addr->sin_addr),
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cl_init->addr->sin_port, cl_init->rpc_ops->version);
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/* see if the client already exists */
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do {
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spin_lock(&nfs_client_lock);
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clp = nfs_match_client(cl_init);
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if (clp)
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goto found_client;
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if (new)
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goto install_client;
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spin_unlock(&nfs_client_lock);
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new = nfs_alloc_client(cl_init);
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} while (new);
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return ERR_PTR(-ENOMEM);
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/* install a new client and return with it unready */
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install_client:
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clp = new;
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list_add(&clp->cl_share_link, &nfs_client_list);
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spin_unlock(&nfs_client_lock);
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dprintk("--> nfs_get_client() = %p [new]\n", clp);
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return clp;
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/* found an existing client
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* - make sure it's ready before returning
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*/
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found_client:
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spin_unlock(&nfs_client_lock);
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if (new)
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nfs_free_client(new);
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error = wait_event_interruptible(nfs_client_active_wq,
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clp->cl_cons_state != NFS_CS_INITING);
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if (error < 0) {
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nfs_put_client(clp);
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return ERR_PTR(-ERESTARTSYS);
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}
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if (clp->cl_cons_state < NFS_CS_READY) {
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error = clp->cl_cons_state;
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nfs_put_client(clp);
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return ERR_PTR(error);
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}
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BUG_ON(clp->cl_cons_state != NFS_CS_READY);
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dprintk("--> nfs_get_client() = %p [share]\n", clp);
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return clp;
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}
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/*
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* Mark a server as ready or failed
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*/
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static void nfs_mark_client_ready(struct nfs_client *clp, int state)
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{
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clp->cl_cons_state = state;
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wake_up_all(&nfs_client_active_wq);
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}
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/*
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* Initialise the timeout values for a connection
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*/
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static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
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unsigned int timeo, unsigned int retrans)
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{
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to->to_initval = timeo * HZ / 10;
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to->to_retries = retrans;
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if (!to->to_retries)
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to->to_retries = 2;
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switch (proto) {
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case XPRT_TRANSPORT_TCP:
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case XPRT_TRANSPORT_RDMA:
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if (!to->to_initval)
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to->to_initval = 60 * HZ;
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if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
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to->to_initval = NFS_MAX_TCP_TIMEOUT;
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to->to_increment = to->to_initval;
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to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
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to->to_exponential = 0;
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break;
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case XPRT_TRANSPORT_UDP:
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default:
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if (!to->to_initval)
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to->to_initval = 11 * HZ / 10;
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if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
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to->to_initval = NFS_MAX_UDP_TIMEOUT;
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to->to_maxval = NFS_MAX_UDP_TIMEOUT;
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to->to_exponential = 1;
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break;
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}
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}
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/*
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* Create an RPC client handle
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*/
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static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
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unsigned int timeo,
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unsigned int retrans,
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rpc_authflavor_t flavor,
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int flags)
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{
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struct rpc_timeout timeparms;
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struct rpc_clnt *clnt = NULL;
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struct rpc_create_args args = {
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.protocol = proto,
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.address = (struct sockaddr *)&clp->cl_addr,
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.addrsize = sizeof(clp->cl_addr),
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.timeout = &timeparms,
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.servername = clp->cl_hostname,
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.program = &nfs_program,
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.version = clp->rpc_ops->version,
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.authflavor = flavor,
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.flags = flags,
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};
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if (!IS_ERR(clp->cl_rpcclient))
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return 0;
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nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
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clp->retrans_timeo = timeparms.to_initval;
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clp->retrans_count = timeparms.to_retries;
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clnt = rpc_create(&args);
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if (IS_ERR(clnt)) {
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dprintk("%s: cannot create RPC client. Error = %ld\n",
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__FUNCTION__, PTR_ERR(clnt));
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return PTR_ERR(clnt);
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}
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clp->cl_rpcclient = clnt;
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return 0;
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}
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/*
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* Version 2 or 3 client destruction
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*/
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static void nfs_destroy_server(struct nfs_server *server)
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{
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if (!(server->flags & NFS_MOUNT_NONLM))
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lockd_down(); /* release rpc.lockd */
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}
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|
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/*
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* Version 2 or 3 lockd setup
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*/
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static int nfs_start_lockd(struct nfs_server *server)
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{
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int error = 0;
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if (server->nfs_client->rpc_ops->version > 3)
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goto out;
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if (server->flags & NFS_MOUNT_NONLM)
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goto out;
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error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
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IPPROTO_TCP : IPPROTO_UDP);
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if (error < 0)
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server->flags |= NFS_MOUNT_NONLM;
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else
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server->destroy = nfs_destroy_server;
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out:
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return error;
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}
|
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|
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/*
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* Initialise an NFSv3 ACL client connection
|
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*/
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#ifdef CONFIG_NFS_V3_ACL
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static void nfs_init_server_aclclient(struct nfs_server *server)
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{
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if (server->nfs_client->rpc_ops->version != 3)
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goto out_noacl;
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if (server->flags & NFS_MOUNT_NOACL)
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goto out_noacl;
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server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
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if (IS_ERR(server->client_acl))
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goto out_noacl;
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|
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/* No errors! Assume that Sun nfsacls are supported */
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server->caps |= NFS_CAP_ACLS;
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return;
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|
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out_noacl:
|
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server->caps &= ~NFS_CAP_ACLS;
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}
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#else
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static inline void nfs_init_server_aclclient(struct nfs_server *server)
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{
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server->flags &= ~NFS_MOUNT_NOACL;
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server->caps &= ~NFS_CAP_ACLS;
|
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}
|
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#endif
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|
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/*
|
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* Create a general RPC client
|
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*/
|
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static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
|
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{
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struct nfs_client *clp = server->nfs_client;
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|
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server->client = rpc_clone_client(clp->cl_rpcclient);
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if (IS_ERR(server->client)) {
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dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
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return PTR_ERR(server->client);
|
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}
|
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|
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if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
|
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struct rpc_auth *auth;
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|
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auth = rpcauth_create(pseudoflavour, server->client);
|
|
if (IS_ERR(auth)) {
|
|
dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
|
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return PTR_ERR(auth);
|
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}
|
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}
|
|
server->client->cl_softrtry = 0;
|
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if (server->flags & NFS_MOUNT_SOFT)
|
|
server->client->cl_softrtry = 1;
|
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|
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server->client->cl_intr = 0;
|
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if (server->flags & NFS4_MOUNT_INTR)
|
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server->client->cl_intr = 1;
|
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|
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return 0;
|
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}
|
|
|
|
/*
|
|
* Initialise an NFS2 or NFS3 client
|
|
*/
|
|
static int nfs_init_client(struct nfs_client *clp,
|
|
const struct nfs_parsed_mount_data *data)
|
|
{
|
|
int error;
|
|
|
|
if (clp->cl_cons_state == NFS_CS_READY) {
|
|
/* the client is already initialised */
|
|
dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create a client RPC handle for doing FSSTAT with UNIX auth only
|
|
* - RFC 2623, sec 2.3.2
|
|
*/
|
|
error = nfs_create_rpc_client(clp, data->nfs_server.protocol,
|
|
data->timeo, data->retrans, RPC_AUTH_UNIX, 0);
|
|
if (error < 0)
|
|
goto error;
|
|
nfs_mark_client_ready(clp, NFS_CS_READY);
|
|
return 0;
|
|
|
|
error:
|
|
nfs_mark_client_ready(clp, error);
|
|
dprintk("<-- nfs_init_client() = xerror %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Create a version 2 or 3 client
|
|
*/
|
|
static int nfs_init_server(struct nfs_server *server,
|
|
const struct nfs_parsed_mount_data *data)
|
|
{
|
|
struct nfs_client_initdata cl_init = {
|
|
.hostname = data->nfs_server.hostname,
|
|
.addr = &data->nfs_server.address,
|
|
.rpc_ops = &nfs_v2_clientops,
|
|
};
|
|
struct nfs_client *clp;
|
|
int error;
|
|
|
|
dprintk("--> nfs_init_server()\n");
|
|
|
|
#ifdef CONFIG_NFS_V3
|
|
if (data->flags & NFS_MOUNT_VER3)
|
|
cl_init.rpc_ops = &nfs_v3_clientops;
|
|
#endif
|
|
|
|
/* Allocate or find a client reference we can use */
|
|
clp = nfs_get_client(&cl_init);
|
|
if (IS_ERR(clp)) {
|
|
dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
|
|
return PTR_ERR(clp);
|
|
}
|
|
|
|
error = nfs_init_client(clp, data);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
server->nfs_client = clp;
|
|
|
|
/* Initialise the client representation from the mount data */
|
|
server->flags = data->flags & NFS_MOUNT_FLAGMASK;
|
|
|
|
if (data->rsize)
|
|
server->rsize = nfs_block_size(data->rsize, NULL);
|
|
if (data->wsize)
|
|
server->wsize = nfs_block_size(data->wsize, NULL);
|
|
|
|
server->acregmin = data->acregmin * HZ;
|
|
server->acregmax = data->acregmax * HZ;
|
|
server->acdirmin = data->acdirmin * HZ;
|
|
server->acdirmax = data->acdirmax * HZ;
|
|
|
|
/* Start lockd here, before we might error out */
|
|
error = nfs_start_lockd(server);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
server->namelen = data->namlen;
|
|
/* Create a client RPC handle for the NFSv3 ACL management interface */
|
|
nfs_init_server_aclclient(server);
|
|
dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
|
|
return 0;
|
|
|
|
error:
|
|
server->nfs_client = NULL;
|
|
nfs_put_client(clp);
|
|
dprintk("<-- nfs_init_server() = xerror %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Load up the server record from information gained in an fsinfo record
|
|
*/
|
|
static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
|
|
{
|
|
unsigned long max_rpc_payload;
|
|
|
|
/* Work out a lot of parameters */
|
|
if (server->rsize == 0)
|
|
server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
|
|
if (server->wsize == 0)
|
|
server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
|
|
|
|
if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
|
|
server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
|
|
if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
|
|
server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
|
|
|
|
max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
|
|
if (server->rsize > max_rpc_payload)
|
|
server->rsize = max_rpc_payload;
|
|
if (server->rsize > NFS_MAX_FILE_IO_SIZE)
|
|
server->rsize = NFS_MAX_FILE_IO_SIZE;
|
|
server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
|
|
|
server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
|
|
|
|
if (server->wsize > max_rpc_payload)
|
|
server->wsize = max_rpc_payload;
|
|
if (server->wsize > NFS_MAX_FILE_IO_SIZE)
|
|
server->wsize = NFS_MAX_FILE_IO_SIZE;
|
|
server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
|
server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
|
|
|
|
server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
|
|
if (server->dtsize > PAGE_CACHE_SIZE)
|
|
server->dtsize = PAGE_CACHE_SIZE;
|
|
if (server->dtsize > server->rsize)
|
|
server->dtsize = server->rsize;
|
|
|
|
if (server->flags & NFS_MOUNT_NOAC) {
|
|
server->acregmin = server->acregmax = 0;
|
|
server->acdirmin = server->acdirmax = 0;
|
|
}
|
|
|
|
server->maxfilesize = fsinfo->maxfilesize;
|
|
|
|
/* We're airborne Set socket buffersize */
|
|
rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
|
|
}
|
|
|
|
/*
|
|
* Probe filesystem information, including the FSID on v2/v3
|
|
*/
|
|
static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_fsinfo fsinfo;
|
|
struct nfs_client *clp = server->nfs_client;
|
|
int error;
|
|
|
|
dprintk("--> nfs_probe_fsinfo()\n");
|
|
|
|
if (clp->rpc_ops->set_capabilities != NULL) {
|
|
error = clp->rpc_ops->set_capabilities(server, mntfh);
|
|
if (error < 0)
|
|
goto out_error;
|
|
}
|
|
|
|
fsinfo.fattr = fattr;
|
|
nfs_fattr_init(fattr);
|
|
error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
|
|
if (error < 0)
|
|
goto out_error;
|
|
|
|
nfs_server_set_fsinfo(server, &fsinfo);
|
|
error = bdi_init(&server->backing_dev_info);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
|
|
/* Get some general file system info */
|
|
if (server->namelen == 0) {
|
|
struct nfs_pathconf pathinfo;
|
|
|
|
pathinfo.fattr = fattr;
|
|
nfs_fattr_init(fattr);
|
|
|
|
if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
|
|
server->namelen = pathinfo.max_namelen;
|
|
}
|
|
|
|
dprintk("<-- nfs_probe_fsinfo() = 0\n");
|
|
return 0;
|
|
|
|
out_error:
|
|
dprintk("nfs_probe_fsinfo: error = %d\n", -error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Copy useful information when duplicating a server record
|
|
*/
|
|
static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
|
|
{
|
|
target->flags = source->flags;
|
|
target->acregmin = source->acregmin;
|
|
target->acregmax = source->acregmax;
|
|
target->acdirmin = source->acdirmin;
|
|
target->acdirmax = source->acdirmax;
|
|
target->caps = source->caps;
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialise a server record
|
|
*/
|
|
static struct nfs_server *nfs_alloc_server(void)
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
|
|
if (!server)
|
|
return NULL;
|
|
|
|
server->client = server->client_acl = ERR_PTR(-EINVAL);
|
|
|
|
/* Zero out the NFS state stuff */
|
|
INIT_LIST_HEAD(&server->client_link);
|
|
INIT_LIST_HEAD(&server->master_link);
|
|
|
|
init_waitqueue_head(&server->active_wq);
|
|
atomic_set(&server->active, 0);
|
|
|
|
server->io_stats = nfs_alloc_iostats();
|
|
if (!server->io_stats) {
|
|
kfree(server);
|
|
return NULL;
|
|
}
|
|
|
|
return server;
|
|
}
|
|
|
|
/*
|
|
* Free up a server record
|
|
*/
|
|
void nfs_free_server(struct nfs_server *server)
|
|
{
|
|
dprintk("--> nfs_free_server()\n");
|
|
|
|
spin_lock(&nfs_client_lock);
|
|
list_del(&server->client_link);
|
|
list_del(&server->master_link);
|
|
spin_unlock(&nfs_client_lock);
|
|
|
|
if (server->destroy != NULL)
|
|
server->destroy(server);
|
|
|
|
if (!IS_ERR(server->client_acl))
|
|
rpc_shutdown_client(server->client_acl);
|
|
if (!IS_ERR(server->client))
|
|
rpc_shutdown_client(server->client);
|
|
|
|
nfs_put_client(server->nfs_client);
|
|
|
|
nfs_free_iostats(server->io_stats);
|
|
bdi_destroy(&server->backing_dev_info);
|
|
kfree(server);
|
|
nfs_release_automount_timer();
|
|
dprintk("<-- nfs_free_server()\n");
|
|
}
|
|
|
|
/*
|
|
* Create a version 2 or 3 volume record
|
|
* - keyed on server and FSID
|
|
*/
|
|
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
|
|
struct nfs_fh *mntfh)
|
|
{
|
|
struct nfs_server *server;
|
|
struct nfs_fattr fattr;
|
|
int error;
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Get a client representation */
|
|
error = nfs_init_server(server, data);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
BUG_ON(!server->nfs_client);
|
|
BUG_ON(!server->nfs_client->rpc_ops);
|
|
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
|
|
|
|
/* Probe the root fh to retrieve its FSID */
|
|
error = nfs_probe_fsinfo(server, mntfh, &fattr);
|
|
if (error < 0)
|
|
goto error;
|
|
if (server->nfs_client->rpc_ops->version == 3) {
|
|
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
|
|
server->namelen = NFS3_MAXNAMLEN;
|
|
if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
|
|
server->caps |= NFS_CAP_READDIRPLUS;
|
|
} else {
|
|
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
|
|
server->namelen = NFS2_MAXNAMLEN;
|
|
}
|
|
|
|
if (!(fattr.valid & NFS_ATTR_FATTR)) {
|
|
error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
|
|
if (error < 0) {
|
|
dprintk("nfs_create_server: getattr error = %d\n", -error);
|
|
goto error;
|
|
}
|
|
}
|
|
memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
|
|
|
|
dprintk("Server FSID: %llx:%llx\n",
|
|
(unsigned long long) server->fsid.major,
|
|
(unsigned long long) server->fsid.minor);
|
|
|
|
BUG_ON(!server->nfs_client);
|
|
BUG_ON(!server->nfs_client->rpc_ops);
|
|
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
|
|
|
|
spin_lock(&nfs_client_lock);
|
|
list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
|
|
list_add_tail(&server->master_link, &nfs_volume_list);
|
|
spin_unlock(&nfs_client_lock);
|
|
|
|
server->mount_time = jiffies;
|
|
return server;
|
|
|
|
error:
|
|
nfs_free_server(server);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_V4
|
|
/*
|
|
* Initialise an NFS4 client record
|
|
*/
|
|
static int nfs4_init_client(struct nfs_client *clp,
|
|
int proto, int timeo, int retrans,
|
|
const char *ip_addr,
|
|
rpc_authflavor_t authflavour)
|
|
{
|
|
int error;
|
|
|
|
if (clp->cl_cons_state == NFS_CS_READY) {
|
|
/* the client is initialised already */
|
|
dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
|
|
return 0;
|
|
}
|
|
|
|
/* Check NFS protocol revision and initialize RPC op vector */
|
|
clp->rpc_ops = &nfs_v4_clientops;
|
|
|
|
error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour,
|
|
RPC_CLNT_CREATE_DISCRTRY);
|
|
if (error < 0)
|
|
goto error;
|
|
memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
|
|
|
|
error = nfs_idmap_new(clp);
|
|
if (error < 0) {
|
|
dprintk("%s: failed to create idmapper. Error = %d\n",
|
|
__FUNCTION__, error);
|
|
goto error;
|
|
}
|
|
__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
|
|
|
|
nfs_mark_client_ready(clp, NFS_CS_READY);
|
|
return 0;
|
|
|
|
error:
|
|
nfs_mark_client_ready(clp, error);
|
|
dprintk("<-- nfs4_init_client() = xerror %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Set up an NFS4 client
|
|
*/
|
|
static int nfs4_set_client(struct nfs_server *server,
|
|
const char *hostname, const struct sockaddr_in *addr,
|
|
const char *ip_addr,
|
|
rpc_authflavor_t authflavour,
|
|
int proto, int timeo, int retrans)
|
|
{
|
|
struct nfs_client_initdata cl_init = {
|
|
.hostname = hostname,
|
|
.addr = addr,
|
|
.rpc_ops = &nfs_v4_clientops,
|
|
};
|
|
struct nfs_client *clp;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_set_client()\n");
|
|
|
|
/* Allocate or find a client reference we can use */
|
|
clp = nfs_get_client(&cl_init);
|
|
if (IS_ERR(clp)) {
|
|
error = PTR_ERR(clp);
|
|
goto error;
|
|
}
|
|
error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour);
|
|
if (error < 0)
|
|
goto error_put;
|
|
|
|
server->nfs_client = clp;
|
|
dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
|
|
return 0;
|
|
|
|
error_put:
|
|
nfs_put_client(clp);
|
|
error:
|
|
dprintk("<-- nfs4_set_client() = xerror %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Create a version 4 volume record
|
|
*/
|
|
static int nfs4_init_server(struct nfs_server *server,
|
|
const struct nfs_parsed_mount_data *data)
|
|
{
|
|
int error;
|
|
|
|
dprintk("--> nfs4_init_server()\n");
|
|
|
|
/* Initialise the client representation from the mount data */
|
|
server->flags = data->flags & NFS_MOUNT_FLAGMASK;
|
|
server->caps |= NFS_CAP_ATOMIC_OPEN;
|
|
|
|
if (data->rsize)
|
|
server->rsize = nfs_block_size(data->rsize, NULL);
|
|
if (data->wsize)
|
|
server->wsize = nfs_block_size(data->wsize, NULL);
|
|
|
|
server->acregmin = data->acregmin * HZ;
|
|
server->acregmax = data->acregmax * HZ;
|
|
server->acdirmin = data->acdirmin * HZ;
|
|
server->acdirmax = data->acdirmax * HZ;
|
|
|
|
error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
|
|
|
|
/* Done */
|
|
dprintk("<-- nfs4_init_server() = %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Create a version 4 volume record
|
|
* - keyed on server and FSID
|
|
*/
|
|
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
|
|
struct nfs_fh *mntfh)
|
|
{
|
|
struct nfs_fattr fattr;
|
|
struct nfs_server *server;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_create_server()\n");
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Get a client record */
|
|
error = nfs4_set_client(server,
|
|
data->nfs_server.hostname,
|
|
&data->nfs_server.address,
|
|
data->client_address,
|
|
data->auth_flavors[0],
|
|
data->nfs_server.protocol,
|
|
data->timeo, data->retrans);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
/* set up the general RPC client */
|
|
error = nfs4_init_server(server, data);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
BUG_ON(!server->nfs_client);
|
|
BUG_ON(!server->nfs_client->rpc_ops);
|
|
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
|
|
|
|
/* Probe the root fh to retrieve its FSID */
|
|
error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
dprintk("Server FSID: %llx:%llx\n",
|
|
(unsigned long long) server->fsid.major,
|
|
(unsigned long long) server->fsid.minor);
|
|
dprintk("Mount FH: %d\n", mntfh->size);
|
|
|
|
error = nfs_probe_fsinfo(server, mntfh, &fattr);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
|
|
server->namelen = NFS4_MAXNAMLEN;
|
|
|
|
BUG_ON(!server->nfs_client);
|
|
BUG_ON(!server->nfs_client->rpc_ops);
|
|
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
|
|
|
|
spin_lock(&nfs_client_lock);
|
|
list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
|
|
list_add_tail(&server->master_link, &nfs_volume_list);
|
|
spin_unlock(&nfs_client_lock);
|
|
|
|
server->mount_time = jiffies;
|
|
dprintk("<-- nfs4_create_server() = %p\n", server);
|
|
return server;
|
|
|
|
error:
|
|
nfs_free_server(server);
|
|
dprintk("<-- nfs4_create_server() = error %d\n", error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/*
|
|
* Create an NFS4 referral server record
|
|
*/
|
|
struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
|
|
struct nfs_fh *mntfh)
|
|
{
|
|
struct nfs_client *parent_client;
|
|
struct nfs_server *server, *parent_server;
|
|
struct nfs_fattr fattr;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_create_referral_server()\n");
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
parent_server = NFS_SB(data->sb);
|
|
parent_client = parent_server->nfs_client;
|
|
|
|
/* Get a client representation.
|
|
* Note: NFSv4 always uses TCP, */
|
|
error = nfs4_set_client(server, data->hostname, data->addr,
|
|
parent_client->cl_ipaddr,
|
|
data->authflavor,
|
|
parent_server->client->cl_xprt->prot,
|
|
parent_client->retrans_timeo,
|
|
parent_client->retrans_count);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
/* Initialise the client representation from the parent server */
|
|
nfs_server_copy_userdata(server, parent_server);
|
|
server->caps |= NFS_CAP_ATOMIC_OPEN;
|
|
|
|
error = nfs_init_server_rpcclient(server, data->authflavor);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
BUG_ON(!server->nfs_client);
|
|
BUG_ON(!server->nfs_client->rpc_ops);
|
|
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
|
|
|
|
/* Probe the root fh to retrieve its FSID and filehandle */
|
|
error = nfs4_path_walk(server, mntfh, data->mnt_path);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
/* probe the filesystem info for this server filesystem */
|
|
error = nfs_probe_fsinfo(server, mntfh, &fattr);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
|
|
server->namelen = NFS4_MAXNAMLEN;
|
|
|
|
dprintk("Referral FSID: %llx:%llx\n",
|
|
(unsigned long long) server->fsid.major,
|
|
(unsigned long long) server->fsid.minor);
|
|
|
|
spin_lock(&nfs_client_lock);
|
|
list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
|
|
list_add_tail(&server->master_link, &nfs_volume_list);
|
|
spin_unlock(&nfs_client_lock);
|
|
|
|
server->mount_time = jiffies;
|
|
|
|
dprintk("<-- nfs_create_referral_server() = %p\n", server);
|
|
return server;
|
|
|
|
error:
|
|
nfs_free_server(server);
|
|
dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
#endif /* CONFIG_NFS_V4 */
|
|
|
|
/*
|
|
* Clone an NFS2, NFS3 or NFS4 server record
|
|
*/
|
|
struct nfs_server *nfs_clone_server(struct nfs_server *source,
|
|
struct nfs_fh *fh,
|
|
struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_server *server;
|
|
struct nfs_fattr fattr_fsinfo;
|
|
int error;
|
|
|
|
dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
|
|
(unsigned long long) fattr->fsid.major,
|
|
(unsigned long long) fattr->fsid.minor);
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Copy data from the source */
|
|
server->nfs_client = source->nfs_client;
|
|
atomic_inc(&server->nfs_client->cl_count);
|
|
nfs_server_copy_userdata(server, source);
|
|
|
|
server->fsid = fattr->fsid;
|
|
|
|
error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
|
|
if (error < 0)
|
|
goto out_free_server;
|
|
if (!IS_ERR(source->client_acl))
|
|
nfs_init_server_aclclient(server);
|
|
|
|
/* probe the filesystem info for this server filesystem */
|
|
error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
|
|
if (error < 0)
|
|
goto out_free_server;
|
|
|
|
if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
|
|
server->namelen = NFS4_MAXNAMLEN;
|
|
|
|
dprintk("Cloned FSID: %llx:%llx\n",
|
|
(unsigned long long) server->fsid.major,
|
|
(unsigned long long) server->fsid.minor);
|
|
|
|
error = nfs_start_lockd(server);
|
|
if (error < 0)
|
|
goto out_free_server;
|
|
|
|
spin_lock(&nfs_client_lock);
|
|
list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
|
|
list_add_tail(&server->master_link, &nfs_volume_list);
|
|
spin_unlock(&nfs_client_lock);
|
|
|
|
server->mount_time = jiffies;
|
|
|
|
dprintk("<-- nfs_clone_server() = %p\n", server);
|
|
return server;
|
|
|
|
out_free_server:
|
|
nfs_free_server(server);
|
|
dprintk("<-- nfs_clone_server() = error %d\n", error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static struct proc_dir_entry *proc_fs_nfs;
|
|
|
|
static int nfs_server_list_open(struct inode *inode, struct file *file);
|
|
static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
|
|
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
|
|
static void nfs_server_list_stop(struct seq_file *p, void *v);
|
|
static int nfs_server_list_show(struct seq_file *m, void *v);
|
|
|
|
static struct seq_operations nfs_server_list_ops = {
|
|
.start = nfs_server_list_start,
|
|
.next = nfs_server_list_next,
|
|
.stop = nfs_server_list_stop,
|
|
.show = nfs_server_list_show,
|
|
};
|
|
|
|
static const struct file_operations nfs_server_list_fops = {
|
|
.open = nfs_server_list_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int nfs_volume_list_open(struct inode *inode, struct file *file);
|
|
static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
|
|
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
|
|
static void nfs_volume_list_stop(struct seq_file *p, void *v);
|
|
static int nfs_volume_list_show(struct seq_file *m, void *v);
|
|
|
|
static struct seq_operations nfs_volume_list_ops = {
|
|
.start = nfs_volume_list_start,
|
|
.next = nfs_volume_list_next,
|
|
.stop = nfs_volume_list_stop,
|
|
.show = nfs_volume_list_show,
|
|
};
|
|
|
|
static const struct file_operations nfs_volume_list_fops = {
|
|
.open = nfs_volume_list_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/*
|
|
* open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
|
|
* we're dealing
|
|
*/
|
|
static int nfs_server_list_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *m;
|
|
int ret;
|
|
|
|
ret = seq_open(file, &nfs_server_list_ops);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
m = file->private_data;
|
|
m->private = PDE(inode)->data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* set up the iterator to start reading from the server list and return the first item
|
|
*/
|
|
static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
|
|
{
|
|
/* lock the list against modification */
|
|
spin_lock(&nfs_client_lock);
|
|
return seq_list_start_head(&nfs_client_list, *_pos);
|
|
}
|
|
|
|
/*
|
|
* move to next server
|
|
*/
|
|
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
|
|
{
|
|
return seq_list_next(v, &nfs_client_list, pos);
|
|
}
|
|
|
|
/*
|
|
* clean up after reading from the transports list
|
|
*/
|
|
static void nfs_server_list_stop(struct seq_file *p, void *v)
|
|
{
|
|
spin_unlock(&nfs_client_lock);
|
|
}
|
|
|
|
/*
|
|
* display a header line followed by a load of call lines
|
|
*/
|
|
static int nfs_server_list_show(struct seq_file *m, void *v)
|
|
{
|
|
struct nfs_client *clp;
|
|
|
|
/* display header on line 1 */
|
|
if (v == &nfs_client_list) {
|
|
seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
|
|
return 0;
|
|
}
|
|
|
|
/* display one transport per line on subsequent lines */
|
|
clp = list_entry(v, struct nfs_client, cl_share_link);
|
|
|
|
seq_printf(m, "v%u %s %s %3d %s\n",
|
|
clp->rpc_ops->version,
|
|
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
|
|
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
|
|
atomic_read(&clp->cl_count),
|
|
clp->cl_hostname);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
|
|
*/
|
|
static int nfs_volume_list_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *m;
|
|
int ret;
|
|
|
|
ret = seq_open(file, &nfs_volume_list_ops);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
m = file->private_data;
|
|
m->private = PDE(inode)->data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* set up the iterator to start reading from the volume list and return the first item
|
|
*/
|
|
static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
|
|
{
|
|
/* lock the list against modification */
|
|
spin_lock(&nfs_client_lock);
|
|
return seq_list_start_head(&nfs_volume_list, *_pos);
|
|
}
|
|
|
|
/*
|
|
* move to next volume
|
|
*/
|
|
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
|
|
{
|
|
return seq_list_next(v, &nfs_volume_list, pos);
|
|
}
|
|
|
|
/*
|
|
* clean up after reading from the transports list
|
|
*/
|
|
static void nfs_volume_list_stop(struct seq_file *p, void *v)
|
|
{
|
|
spin_unlock(&nfs_client_lock);
|
|
}
|
|
|
|
/*
|
|
* display a header line followed by a load of call lines
|
|
*/
|
|
static int nfs_volume_list_show(struct seq_file *m, void *v)
|
|
{
|
|
struct nfs_server *server;
|
|
struct nfs_client *clp;
|
|
char dev[8], fsid[17];
|
|
|
|
/* display header on line 1 */
|
|
if (v == &nfs_volume_list) {
|
|
seq_puts(m, "NV SERVER PORT DEV FSID\n");
|
|
return 0;
|
|
}
|
|
/* display one transport per line on subsequent lines */
|
|
server = list_entry(v, struct nfs_server, master_link);
|
|
clp = server->nfs_client;
|
|
|
|
snprintf(dev, 8, "%u:%u",
|
|
MAJOR(server->s_dev), MINOR(server->s_dev));
|
|
|
|
snprintf(fsid, 17, "%llx:%llx",
|
|
(unsigned long long) server->fsid.major,
|
|
(unsigned long long) server->fsid.minor);
|
|
|
|
seq_printf(m, "v%u %s %s %-7s %-17s\n",
|
|
clp->rpc_ops->version,
|
|
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
|
|
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
|
|
dev,
|
|
fsid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* initialise the /proc/fs/nfsfs/ directory
|
|
*/
|
|
int __init nfs_fs_proc_init(void)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
|
|
if (!proc_fs_nfs)
|
|
goto error_0;
|
|
|
|
proc_fs_nfs->owner = THIS_MODULE;
|
|
|
|
/* a file of servers with which we're dealing */
|
|
p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
|
|
if (!p)
|
|
goto error_1;
|
|
|
|
p->proc_fops = &nfs_server_list_fops;
|
|
p->owner = THIS_MODULE;
|
|
|
|
/* a file of volumes that we have mounted */
|
|
p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
|
|
if (!p)
|
|
goto error_2;
|
|
|
|
p->proc_fops = &nfs_volume_list_fops;
|
|
p->owner = THIS_MODULE;
|
|
return 0;
|
|
|
|
error_2:
|
|
remove_proc_entry("servers", proc_fs_nfs);
|
|
error_1:
|
|
remove_proc_entry("nfsfs", proc_root_fs);
|
|
error_0:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* clean up the /proc/fs/nfsfs/ directory
|
|
*/
|
|
void nfs_fs_proc_exit(void)
|
|
{
|
|
remove_proc_entry("volumes", proc_fs_nfs);
|
|
remove_proc_entry("servers", proc_fs_nfs);
|
|
remove_proc_entry("nfsfs", proc_root_fs);
|
|
}
|
|
|
|
#endif /* CONFIG_PROC_FS */
|