| /* 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/sched.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/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/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 */ |
| |
| struct nfs_client_initdata { |
| const char *hostname; |
| const struct sockaddr_in *addr; |
| int version; |
| }; |
| |
| /* |
| * 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 struct nfs_client_initdata *cl_init) |
| { |
| struct nfs_client *clp; |
| |
| if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) |
| goto error_0; |
| |
| if (cl_init->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 = cl_init->version; |
| memcpy(&clp->cl_addr, cl_init->addr, sizeof(clp->cl_addr)); |
| |
| 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); |
| |
| #ifdef CONFIG_NFS_V4 |
| init_rwsem(&clp->cl_sem); |
| INIT_LIST_HEAD(&clp->cl_delegations); |
| spin_lock_init(&clp->cl_lock); |
| 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; |
| #endif |
| |
| return clp; |
| |
| error_3: |
| if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) |
| nfs_callback_down(); |
| error_2: |
| 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); |
| #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(); |
| |
| 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 (clp->cl_addr.sin_addr.s_addr != addr->sin_addr.s_addr) |
| 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 struct nfs_client_initdata *cl_init) |
| { |
| struct nfs_client *clp, *new = NULL; |
| int error; |
| |
| dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n", |
| cl_init->hostname ?: "", NIPQUAD(cl_init->addr->sin_addr), |
| cl_init->addr->sin_port, cl_init->version); |
| |
| /* see if the client already exists */ |
| do { |
| spin_lock(&nfs_client_lock); |
| |
| clp = __nfs_find_client(cl_init->addr, cl_init->version, 1); |
| if (clp) |
| goto found_client; |
| if (new) |
| goto install_client; |
| |
| spin_unlock(&nfs_client_lock); |
| |
| new = nfs_alloc_client(cl_init); |
| } 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 XPRT_TRANSPORT_TCP: |
| case XPRT_TRANSPORT_RDMA: |
| 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 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, int proto, |
| unsigned int timeo, |
| unsigned int retrans, |
| rpc_authflavor_t flavor, |
| int flags) |
| { |
| 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, |
| .flags = flags, |
| }; |
| |
| 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 (!(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_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; |
| } |
| |
| /* 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, 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, |
| .version = 2, |
| }; |
| struct nfs_client *clp; |
| int error; |
| |
| dprintk("--> nfs_init_server()\n"); |
| |
| #ifdef CONFIG_NFS_V3 |
| if (data->flags & NFS_MOUNT_VER3) |
| cl_init.version = 3; |
| #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, |
| .version = 4, |
| }; |
| 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%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) |
| { |
| /* 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%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 */ |