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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/fs/nfs/client.c

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35 KiB
C
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/* client.c: NFS client sharing and management code
*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/metrics.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/smp_lock.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
#include <linux/nfs_xdr.h>
#include <asm/system.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
static DEFINE_SPINLOCK(nfs_client_lock);
static LIST_HEAD(nfs_client_list);
static LIST_HEAD(nfs_volume_list);
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
/*
* RPC cruft for NFS
*/
static struct rpc_version *nfs_version[5] = {
[2] = &nfs_version2,
#ifdef CONFIG_NFS_V3
[3] = &nfs_version3,
#endif
#ifdef CONFIG_NFS_V4
[4] = &nfs_version4,
#endif
};
struct rpc_program nfs_program = {
.name = "nfs",
.number = NFS_PROGRAM,
.nrvers = ARRAY_SIZE(nfs_version),
.version = nfs_version,
.stats = &nfs_rpcstat,
.pipe_dir_name = "/nfs",
};
struct rpc_stat nfs_rpcstat = {
.program = &nfs_program
};
#ifdef CONFIG_NFS_V3_ACL
static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
static struct rpc_version * nfsacl_version[] = {
[3] = &nfsacl_version3,
};
struct rpc_program nfsacl_program = {
.name = "nfsacl",
.number = NFS_ACL_PROGRAM,
.nrvers = ARRAY_SIZE(nfsacl_version),
.version = nfsacl_version,
.stats = &nfsacl_rpcstat,
};
#endif /* CONFIG_NFS_V3_ACL */
/*
* Allocate a shared client record
*
* Since these are allocated/deallocated very rarely, we don't
* bother putting them in a slab cache...
*/
static struct nfs_client *nfs_alloc_client(const char *hostname,
const struct sockaddr_in *addr,
int nfsversion)
{
struct nfs_client *clp;
int error;
if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
goto error_0;
error = rpciod_up();
if (error < 0) {
dprintk("%s: couldn't start rpciod! Error = %d\n",
__FUNCTION__, error);
goto error_1;
}
__set_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
if (nfsversion == 4) {
if (nfs_callback_up() < 0)
goto error_2;
__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
}
atomic_set(&clp->cl_count, 1);
clp->cl_cons_state = NFS_CS_INITING;
clp->cl_nfsversion = nfsversion;
memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
if (hostname) {
clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
if (!clp->cl_hostname)
goto error_3;
}
INIT_LIST_HEAD(&clp->cl_superblocks);
clp->cl_rpcclient = ERR_PTR(-EINVAL);
#ifdef CONFIG_NFS_V4
init_rwsem(&clp->cl_sem);
INIT_LIST_HEAD(&clp->cl_delegations);
INIT_LIST_HEAD(&clp->cl_state_owners);
INIT_LIST_HEAD(&clp->cl_unused);
spin_lock_init(&clp->cl_lock);
INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
clp->cl_boot_time = CURRENT_TIME;
clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
#endif
return clp;
error_3:
if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
nfs_callback_down();
error_2:
rpciod_down();
__clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
error_1:
kfree(clp);
error_0:
return NULL;
}
static void nfs4_shutdown_client(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4
if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
nfs4_kill_renewd(clp);
while (!list_empty(&clp->cl_unused)) {
struct nfs4_state_owner *sp;
sp = list_entry(clp->cl_unused.next,
struct nfs4_state_owner,
so_list);
list_del(&sp->so_list);
kfree(sp);
}
BUG_ON(!list_empty(&clp->cl_state_owners));
if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
nfs_idmap_delete(clp);
#endif
}
/*
* Destroy a shared client record
*/
static void nfs_free_client(struct nfs_client *clp)
{
dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
nfs4_shutdown_client(clp);
/* -EIO all pending I/O */
if (!IS_ERR(clp->cl_rpcclient))
rpc_shutdown_client(clp->cl_rpcclient);
if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
nfs_callback_down();
if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state))
rpciod_down();
kfree(clp->cl_hostname);
kfree(clp);
dprintk("<-- nfs_free_client()\n");
}
/*
* Release a reference to a shared client record
*/
void nfs_put_client(struct nfs_client *clp)
{
if (!clp)
return;
dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
list_del(&clp->cl_share_link);
spin_unlock(&nfs_client_lock);
BUG_ON(!list_empty(&clp->cl_superblocks));
nfs_free_client(clp);
}
}
/*
* Find a client by address
* - caller must hold nfs_client_lock
*/
static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port)
{
struct nfs_client *clp;
list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
/* Don't match clients that failed to initialise properly */
if (clp->cl_cons_state < 0)
continue;
/* Different NFS versions cannot share the same nfs_client */
if (clp->cl_nfsversion != nfsversion)
continue;
if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
sizeof(clp->cl_addr.sin_addr)) != 0)
continue;
if (!match_port || clp->cl_addr.sin_port == addr->sin_port)
goto found;
}
return NULL;
found:
atomic_inc(&clp->cl_count);
return clp;
}
/*
* Find a client by IP address and protocol version
* - returns NULL if no such client
*/
struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
{
struct nfs_client *clp;
spin_lock(&nfs_client_lock);
clp = __nfs_find_client(addr, nfsversion, 0);
spin_unlock(&nfs_client_lock);
if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) {
nfs_put_client(clp);
clp = NULL;
}
return clp;
}
/*
* Look up a client by IP address and protocol version
* - creates a new record if one doesn't yet exist
*/
static struct nfs_client *nfs_get_client(const char *hostname,
const struct sockaddr_in *addr,
int nfsversion)
{
struct nfs_client *clp, *new = NULL;
int error;
dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",
hostname ?: "", NIPQUAD(addr->sin_addr),
addr->sin_port, nfsversion);
/* see if the client already exists */
do {
spin_lock(&nfs_client_lock);
clp = __nfs_find_client(addr, nfsversion, 1);
if (clp)
goto found_client;
if (new)
goto install_client;
spin_unlock(&nfs_client_lock);
new = nfs_alloc_client(hostname, addr, nfsversion);
} while (new);
return ERR_PTR(-ENOMEM);
/* install a new client and return with it unready */
install_client:
clp = new;
list_add(&clp->cl_share_link, &nfs_client_list);
spin_unlock(&nfs_client_lock);
dprintk("--> nfs_get_client() = %p [new]\n", clp);
return clp;
/* found an existing client
* - make sure it's ready before returning
*/
found_client:
spin_unlock(&nfs_client_lock);
if (new)
nfs_free_client(new);
error = wait_event_interruptible(nfs_client_active_wq,
clp->cl_cons_state != NFS_CS_INITING);
if (error < 0) {
nfs_put_client(clp);
return ERR_PTR(-ERESTARTSYS);
}
if (clp->cl_cons_state < NFS_CS_READY) {
error = clp->cl_cons_state;
nfs_put_client(clp);
return ERR_PTR(error);
}
BUG_ON(clp->cl_cons_state != NFS_CS_READY);
dprintk("--> nfs_get_client() = %p [share]\n", clp);
return clp;
}
/*
* Mark a server as ready or failed
*/
static void nfs_mark_client_ready(struct nfs_client *clp, int state)
{
clp->cl_cons_state = state;
wake_up_all(&nfs_client_active_wq);
}
/*
* Initialise the timeout values for a connection
*/
static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
unsigned int timeo, unsigned int retrans)
{
to->to_initval = timeo * HZ / 10;
to->to_retries = retrans;
if (!to->to_retries)
to->to_retries = 2;
switch (proto) {
case IPPROTO_TCP:
if (!to->to_initval)
to->to_initval = 60 * HZ;
if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
to->to_initval = NFS_MAX_TCP_TIMEOUT;
to->to_increment = to->to_initval;
to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
to->to_exponential = 0;
break;
case IPPROTO_UDP:
default:
if (!to->to_initval)
to->to_initval = 11 * HZ / 10;
if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
to->to_initval = NFS_MAX_UDP_TIMEOUT;
to->to_maxval = NFS_MAX_UDP_TIMEOUT;
to->to_exponential = 1;
break;
}
}
/*
* Create an RPC client handle
*/
static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
unsigned int timeo,
unsigned int retrans,
rpc_authflavor_t flavor)
{
struct rpc_timeout timeparms;
struct rpc_clnt *clnt = NULL;
struct rpc_create_args args = {
.protocol = proto,
.address = (struct sockaddr *)&clp->cl_addr,
.addrsize = sizeof(clp->cl_addr),
.timeout = &timeparms,
.servername = clp->cl_hostname,
.program = &nfs_program,
.version = clp->rpc_ops->version,
.authflavor = flavor,
};
if (!IS_ERR(clp->cl_rpcclient))
return 0;
nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
clp->retrans_timeo = timeparms.to_initval;
clp->retrans_count = timeparms.to_retries;
clnt = rpc_create(&args);
if (IS_ERR(clnt)) {
dprintk("%s: cannot create RPC client. Error = %ld\n",
__FUNCTION__, PTR_ERR(clnt));
return PTR_ERR(clnt);
}
clp->cl_rpcclient = clnt;
return 0;
}
/*
* Version 2 or 3 client destruction
*/
static void nfs_destroy_server(struct nfs_server *server)
{
if (!IS_ERR(server->client_acl))
rpc_shutdown_client(server->client_acl);
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_down(); /* release rpc.lockd */
}
/*
* Version 2 or 3 lockd setup
*/
static int nfs_start_lockd(struct nfs_server *server)
{
int error = 0;
if (server->nfs_client->cl_nfsversion > 3)
goto out;
if (server->flags & NFS_MOUNT_NONLM)
goto out;
error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
IPPROTO_TCP : IPPROTO_UDP);
if (error < 0)
server->flags |= NFS_MOUNT_NONLM;
else
server->destroy = nfs_destroy_server;
out:
return error;
}
/*
* Initialise an NFSv3 ACL client connection
*/
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
if (server->nfs_client->cl_nfsversion != 3)
goto out_noacl;
if (server->flags & NFS_MOUNT_NOACL)
goto out_noacl;
server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
if (IS_ERR(server->client_acl))
goto out_noacl;
/* No errors! Assume that Sun nfsacls are supported */
server->caps |= NFS_CAP_ACLS;
return;
out_noacl:
server->caps &= ~NFS_CAP_ACLS;
}
#else
static inline void nfs_init_server_aclclient(struct nfs_server *server)
{
server->flags &= ~NFS_MOUNT_NOACL;
server->caps &= ~NFS_CAP_ACLS;
}
#endif
/*
* Create a general RPC client
*/
static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
{
struct nfs_client *clp = server->nfs_client;
server->client = rpc_clone_client(clp->cl_rpcclient);
if (IS_ERR(server->client)) {
dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
return PTR_ERR(server->client);
}
if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
struct rpc_auth *auth;
auth = rpcauth_create(pseudoflavour, server->client);
if (IS_ERR(auth)) {
dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
return PTR_ERR(auth);
}
}
server->client->cl_softrtry = 0;
if (server->flags & NFS_MOUNT_SOFT)
server->client->cl_softrtry = 1;
server->client->cl_intr = 0;
if (server->flags & NFS4_MOUNT_INTR)
server->client->cl_intr = 1;
return 0;
}
/*
* Initialise an NFS2 or NFS3 client
*/
static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data)
{
int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
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;
}
/* Check NFS protocol revision and initialize RPC op vector */
clp->rpc_ops = &nfs_v2_clientops;
#ifdef CONFIG_NFS_V3
if (clp->cl_nfsversion == 3)
clp->rpc_ops = &nfs_v3_clientops;
#endif
/*
* Create a client RPC handle for doing FSSTAT with UNIX auth only
* - RFC 2623, sec 2.3.2
*/
error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans,
RPC_AUTH_UNIX);
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_mount_data *data)
{
struct nfs_client *clp;
int error, nfsvers = 2;
dprintk("--> nfs_init_server()\n");
#ifdef CONFIG_NFS_V3
if (data->flags & NFS_MOUNT_VER3)
nfsvers = 3;
#endif
/* Allocate or find a client reference we can use */
clp = nfs_get_client(data->hostname, &data->addr, nfsvers);
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->pseudoflavor);
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);
if (clp->cl_nfsversion == 3) {
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
server->namelen = NFS3_MAXNAMLEN;
server->caps |= NFS_CAP_READDIRPLUS;
} else {
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
server->namelen = NFS2_MAXNAMLEN;
}
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);
/* 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);
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))
rpc_shutdown_client(server->client);
nfs_put_client(server->nfs_client);
nfs_free_iostats(server->io_stats);
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_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 (!(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);
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 *clp;
int error;
dprintk("--> nfs4_set_client()\n");
/* Allocate or find a client reference we can use */
clp = nfs_get_client(hostname, addr, 4);
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 nfs4_mount_data *data, rpc_authflavor_t authflavour)
{
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, authflavour);
/* 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 nfs4_mount_data *data,
const char *hostname,
const struct sockaddr_in *addr,
const char *mntpath,
const char *ip_addr,
rpc_authflavor_t authflavour,
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, hostname, addr, ip_addr, authflavour,
data->proto, data->timeo, data->retrans);
if (error < 0)
goto error;
/* set up the general RPC client */
error = nfs4_init_server(server, data, authflavour);
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, mntpath);
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;
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 *fh)
{
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 filesystem info for this server filesystem */
error = nfs_probe_fsinfo(server, fh, &fattr);
if (error < 0)
goto error;
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;
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 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 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)
{
struct list_head *_p;
loff_t pos = *_pos;
/* lock the list against modification */
spin_lock(&nfs_client_lock);
/* allow for the header line */
if (!pos)
return SEQ_START_TOKEN;
pos--;
/* find the n'th element in the list */
list_for_each(_p, &nfs_client_list)
if (!pos--)
break;
return _p != &nfs_client_list ? _p : NULL;
}
/*
* move to next server
*/
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
struct list_head *_p;
(*pos)++;
_p = v;
_p = (v == SEQ_START_TOKEN) ? nfs_client_list.next : _p->next;
return _p != &nfs_client_list ? _p : NULL;
}
/*
* 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 == SEQ_START_TOKEN) {
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%d %02x%02x%02x%02x %4hx %3d %s\n",
clp->cl_nfsversion,
NIPQUAD(clp->cl_addr.sin_addr),
ntohs(clp->cl_addr.sin_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)
{
struct list_head *_p;
loff_t pos = *_pos;
/* lock the list against modification */
spin_lock(&nfs_client_lock);
/* allow for the header line */
if (!pos)
return SEQ_START_TOKEN;
pos--;
/* find the n'th element in the list */
list_for_each(_p, &nfs_volume_list)
if (!pos--)
break;
return _p != &nfs_volume_list ? _p : NULL;
}
/*
* move to next volume
*/
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
struct list_head *_p;
(*pos)++;
_p = v;
_p = (v == SEQ_START_TOKEN) ? nfs_volume_list.next : _p->next;
return _p != &nfs_volume_list ? _p : NULL;
}
/*
* 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 == SEQ_START_TOKEN) {
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%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
clp->cl_nfsversion,
NIPQUAD(clp->cl_addr.sin_addr),
ntohs(clp->cl_addr.sin_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 */
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