*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
-
+#include <linux/sched.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/metrics.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/sunrpc/xprtrdma.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/in6.h>
+#include <net/ipv6.h>
#include <linux/nfs_xdr.h>
#include <asm/system.h>
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 */
+
+struct nfs_client_initdata {
+ const char *hostname;
+ const struct sockaddr *addr;
+ size_t addrlen;
+ const struct nfs_rpc_ops *rpc_ops;
+ int proto;
+};
+
+/*
* 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)
+static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
{
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);
- __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
- goto error_1;
- }
+ clp->rpc_ops = cl_init->rpc_ops;
- if (nfsversion == 4) {
+ if (cl_init->rpc_ops->version == 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));
+ memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
+ clp->cl_addrlen = cl_init->addrlen;
- if (hostname) {
- clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
+ if (cl_init->hostname) {
+ clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
if (!clp->cl_hostname)
goto error_3;
}
INIT_LIST_HEAD(&clp->cl_superblocks);
clp->cl_rpcclient = ERR_PTR(-EINVAL);
+ clp->cl_proto = cl_init->proto;
+
#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);
+ INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
clp->cl_boot_time = CURRENT_TIME;
clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
return clp;
error_3:
- nfs_callback_down();
- __clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
+ 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);
+ BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
+ if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
+ nfs_idmap_delete(clp);
+
+ rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
+#endif
+}
+
/*
* Destroy a shared client record
*/
static void nfs_free_client(struct nfs_client *clp)
{
- dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
+ dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
-#ifdef CONFIG_NFS_V4
- if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) {
- 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));
- nfs_idmap_delete(clp);
- }
-#endif
+ nfs4_shutdown_client(clp);
/* -EIO all pending I/O */
if (!IS_ERR(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);
*/
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)) {
}
}
+static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
+ const struct sockaddr_in *sa2)
+{
+ return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
+}
+
+static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
+ const struct sockaddr_in6 *sa2)
+{
+ return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
+}
+
+static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
+ const struct sockaddr *sa2)
+{
+ switch (sa1->sa_family) {
+ case AF_INET:
+ return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
+ (const struct sockaddr_in *)sa2);
+ case AF_INET6:
+ return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
+ (const struct sockaddr_in6 *)sa2);
+ }
+ BUG();
+}
+
/*
- * Find a client by address
- * - caller must hold nfs_client_lock
+ * Find a client by IP address and protocol version
+ * - returns NULL if no such client
*/
-static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
+struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
{
struct nfs_client *clp;
+ spin_lock(&nfs_client_lock);
list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
+ struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
+
+ /* Don't match clients that failed to initialise properly */
+ if (clp->cl_cons_state != NFS_CS_READY)
+ continue;
+
/* Different NFS versions cannot share the same nfs_client */
- if (clp->cl_nfsversion != nfsversion)
+ if (clp->rpc_ops->version != nfsversion)
continue;
- if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
- sizeof(clp->cl_addr.sin_addr)) != 0)
+ if (addr->sa_family != clap->sa_family)
+ continue;
+ /* Match only the IP address, not the port number */
+ if (!nfs_sockaddr_match_ipaddr(addr, clap))
continue;
- if (clp->cl_addr.sin_port == addr->sin_port)
- goto found;
+ atomic_inc(&clp->cl_count);
+ spin_unlock(&nfs_client_lock);
+ return clp;
}
-
+ spin_unlock(&nfs_client_lock);
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 *nfs_find_client_next(struct nfs_client *clp)
{
- struct nfs_client *clp;
+ struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
+ u32 nfsvers = clp->rpc_ops->version;
spin_lock(&nfs_client_lock);
- clp = __nfs_find_client(addr, nfsversion);
+ list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
+ struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
+
+ /* Don't match clients that failed to initialise properly */
+ if (clp->cl_cons_state != NFS_CS_READY)
+ continue;
+
+ /* Different NFS versions cannot share the same nfs_client */
+ if (clp->rpc_ops->version != nfsvers)
+ continue;
+
+ if (sap->sa_family != clap->sa_family)
+ continue;
+ /* Match only the IP address, not the port number */
+ if (!nfs_sockaddr_match_ipaddr(sap, clap))
+ continue;
+
+ atomic_inc(&clp->cl_count);
+ spin_unlock(&nfs_client_lock);
+ return clp;
+ }
spin_unlock(&nfs_client_lock);
+ return NULL;
+}
+
+/*
+ * Find an nfs_client on the list that matches the initialisation data
+ * that is supplied.
+ */
+static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
+{
+ struct nfs_client *clp;
- BUG_ON(clp->cl_cons_state == 0);
+ 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;
- return clp;
+ /* Different NFS versions cannot share the same nfs_client */
+ if (clp->rpc_ops != data->rpc_ops)
+ continue;
+
+ if (clp->cl_proto != data->proto)
+ continue;
+
+ /* Match the full socket address */
+ if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
+ continue;
+
+ atomic_inc(&clp->cl_count);
+ return clp;
+ }
+ return NULL;
}
/*
* Look up a client by IP address and protocol version
* - creates a new record if one doesn't yet exist
*/
-struct nfs_client *nfs_get_client(const char *hostname,
- const struct sockaddr_in *addr,
- int nfsversion)
+static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
{
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);
+ dprintk("--> nfs_get_client(%s,v%u)\n",
+ cl_init->hostname ?: "", cl_init->rpc_ops->version);
/* see if the client already exists */
do {
spin_lock(&nfs_client_lock);
- clp = __nfs_find_client(addr, nfsversion);
+ clp = nfs_match_client(cl_init);
if (clp)
goto found_client;
if (new)
spin_unlock(&nfs_client_lock);
- new = nfs_alloc_client(hostname, addr, nfsversion);
+ new = nfs_alloc_client(cl_init);
} while (new);
return ERR_PTR(-ENOMEM);
if (new)
nfs_free_client(new);
- if (clp->cl_cons_state == NFS_CS_INITING) {
- DECLARE_WAITQUEUE(myself, current);
-
- add_wait_queue(&nfs_client_active_wq, &myself);
-
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (signal_pending(current) ||
- clp->cl_cons_state > NFS_CS_READY)
- break;
- schedule();
- }
-
- remove_wait_queue(&nfs_client_active_wq, &myself);
-
- if (signal_pending(current)) {
- nfs_put_client(clp);
- return ERR_PTR(-ERESTARTSYS);
- }
+ error = wait_event_killable(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) {
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
*/
-void nfs_mark_client_ready(struct nfs_client *clp, int state)
+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 XPRT_TRANSPORT_TCP:
+ case XPRT_TRANSPORT_RDMA:
+ if (to->to_initval == 0)
+ 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);
+ if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
+ to->to_maxval = NFS_MAX_TCP_TIMEOUT;
+ if (to->to_maxval < to->to_initval)
+ to->to_maxval = to->to_initval;
+ to->to_exponential = 0;
+ break;
+ case XPRT_TRANSPORT_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,
+ const struct rpc_timeout *timeparms,
+ rpc_authflavor_t flavor,
+ int flags)
+{
+ struct rpc_clnt *clnt = NULL;
+ struct rpc_create_args args = {
+ .protocol = clp->cl_proto,
+ .address = (struct sockaddr *)&clp->cl_addr,
+ .addrsize = clp->cl_addrlen,
+ .timeout = timeparms,
+ .servername = clp->cl_hostname,
+ .program = &nfs_program,
+ .version = clp->rpc_ops->version,
+ .authflavor = flavor,
+ .flags = flags,
+ };
+
+ if (!IS_ERR(clp->cl_rpcclient))
+ return 0;
+
+ 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 (!(server->flags & NFS_MOUNT_NONLM))
+ nlmclnt_done(server->nlm_host);
+}
+
+/*
+ * Version 2 or 3 lockd setup
+ */
+static int nfs_start_lockd(struct nfs_server *server)
+{
+ struct nlm_host *host;
+ struct nfs_client *clp = server->nfs_client;
+ struct nlmclnt_initdata nlm_init = {
+ .hostname = clp->cl_hostname,
+ .address = (struct sockaddr *)&clp->cl_addr,
+ .addrlen = clp->cl_addrlen,
+ .protocol = server->flags & NFS_MOUNT_TCP ?
+ IPPROTO_TCP : IPPROTO_UDP,
+ .nfs_version = clp->rpc_ops->version,
+ };
+
+ if (nlm_init.nfs_version > 3)
+ return 0;
+ if (server->flags & NFS_MOUNT_NONLM)
+ return 0;
+
+ host = nlmclnt_init(&nlm_init);
+ if (IS_ERR(host))
+ return PTR_ERR(host);
+
+ server->nlm_host = host;
+ server->destroy = nfs_destroy_server;
+ return 0;
+}
+
+/*
+ * 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->rpc_ops->version != 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,
+ const struct rpc_timeout *timeo,
+ 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);
+ }
+
+ memcpy(&server->client->cl_timeout_default,
+ timeo,
+ sizeof(server->client->cl_timeout_default));
+ server->client->cl_timeout = &server->client->cl_timeout_default;
+
+ 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;
+
+ return 0;
+}
+
+/*
+ * Initialise an NFS2 or NFS3 client
+ */
+static int nfs_init_client(struct nfs_client *clp,
+ const struct rpc_timeout *timeparms,
+ 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, timeparms, 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 = (const struct sockaddr *)&data->nfs_server.address,
+ .addrlen = data->nfs_server.addrlen,
+ .rpc_ops = &nfs_v2_clientops,
+ .proto = data->nfs_server.protocol,
+ };
+ struct rpc_timeout timeparms;
+ 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);
+ }
+
+ nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
+ data->timeo, data->retrans);
+ error = nfs_init_client(clp, &timeparms, 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, &timeparms, 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,
+ const struct rpc_timeout *timeparms,
+ 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, timeparms, 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 *addr,
+ const size_t addrlen,
+ const char *ip_addr,
+ rpc_authflavor_t authflavour,
+ int proto, const struct rpc_timeout *timeparms)
+{
+ struct nfs_client_initdata cl_init = {
+ .hostname = hostname,
+ .addr = addr,
+ .addrlen = addrlen,
+ .rpc_ops = &nfs_v4_clientops,
+ .proto = proto,
+ };
+ 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, timeparms, 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)
+{
+ struct rpc_timeout timeparms;
+ int error;
+
+ dprintk("--> nfs4_init_server()\n");
+
+ nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
+ data->timeo, data->retrans);
+
+ /* Get a client record */
+ error = nfs4_set_client(server,
+ data->nfs_server.hostname,
+ (const struct sockaddr *)&data->nfs_server.address,
+ data->nfs_server.addrlen,
+ data->client_address,
+ data->auth_flavors[0],
+ data->nfs_server.protocol,
+ &timeparms);
+ if (error < 0)
+ goto error;
+
+ /* 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, &timeparms, data->auth_flavors[0]);
+
+error:
+ /* 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);
+
+ /* 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,
+ data->addrlen,
+ parent_client->cl_ipaddr,
+ data->authflavor,
+ parent_server->client->cl_xprt->prot,
+ parent_server->client->cl_timeout);
+ 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, parent_server->client->cl_timeout, 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_timeout,
+ 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 */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff