/* * linux/fs/nfs/super.c * * Copyright (C) 1992 Rick Sladkey * * nfs superblock handling functions * * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some * experimental NFS changes. Modularisation taken straight from SYS5 fs. * * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. * J.S.Peatfield@damtp.cam.ac.uk * * Split from inode.c by David Howells <dhowells@redhat.com> * * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a * particular server are held in the same superblock * - NFS superblocks can have several effective roots to the dentry tree * - directory type roots are spliced into the tree when a path from one root reaches the root * of another (see nfs_lookup()) */ #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/addr.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/namei.h> #include <linux/vfs.h> #include <linux/inet.h> #include <linux/in6.h> #include <linux/slab.h> #include <net/ipv6.h> #include <linux/netdevice.h> #include <linux/nfs_xdr.h> #include <linux/magic.h> #include <linux/parser.h> #include <linux/nsproxy.h> #include <linux/rcupdate.h> #include <asm/uaccess.h> #include "nfs4_fs.h" #include "callback.h" #include "delegation.h" #include "iostat.h" #include "internal.h" #include "fscache.h" #include "nfs4session.h" #include "pnfs.h" #include "nfs.h" #define NFSDBG_FACILITY NFSDBG_VFS #define NFS_TEXT_DATA 1 #if IS_ENABLED(CONFIG_NFS_V3) #define NFS_DEFAULT_VERSION 3 #else #define NFS_DEFAULT_VERSION 2 #endif enum { /* Mount options that take no arguments */ Opt_soft, Opt_hard, Opt_posix, Opt_noposix, Opt_cto, Opt_nocto, Opt_ac, Opt_noac, Opt_lock, Opt_nolock, Opt_udp, Opt_tcp, Opt_rdma, Opt_acl, Opt_noacl, Opt_rdirplus, Opt_nordirplus, Opt_sharecache, Opt_nosharecache, Opt_resvport, Opt_noresvport, Opt_fscache, Opt_nofscache, Opt_migration, Opt_nomigration, /* Mount options that take integer arguments */ Opt_port, Opt_rsize, Opt_wsize, Opt_bsize, Opt_timeo, Opt_retrans, Opt_acregmin, Opt_acregmax, Opt_acdirmin, Opt_acdirmax, Opt_actimeo, Opt_namelen, Opt_mountport, Opt_mountvers, Opt_minorversion, /* Mount options that take string arguments */ Opt_nfsvers, Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, Opt_addr, Opt_mountaddr, Opt_clientaddr, Opt_lookupcache, Opt_fscache_uniq, Opt_local_lock, /* Special mount options */ Opt_userspace, Opt_deprecated, Opt_sloppy, Opt_err }; static const match_table_t nfs_mount_option_tokens = { { Opt_userspace, "bg" }, { Opt_userspace, "fg" }, { Opt_userspace, "retry=%s" }, { Opt_sloppy, "sloppy" }, { Opt_soft, "soft" }, { Opt_hard, "hard" }, { Opt_deprecated, "intr" }, { Opt_deprecated, "nointr" }, { Opt_posix, "posix" }, { Opt_noposix, "noposix" }, { Opt_cto, "cto" }, { Opt_nocto, "nocto" }, { Opt_ac, "ac" }, { Opt_noac, "noac" }, { Opt_lock, "lock" }, { Opt_nolock, "nolock" }, { Opt_udp, "udp" }, { Opt_tcp, "tcp" }, { Opt_rdma, "rdma" }, { Opt_acl, "acl" }, { Opt_noacl, "noacl" }, { Opt_rdirplus, "rdirplus" }, { Opt_nordirplus, "nordirplus" }, { Opt_sharecache, "sharecache" }, { Opt_nosharecache, "nosharecache" }, { Opt_resvport, "resvport" }, { Opt_noresvport, "noresvport" }, { Opt_fscache, "fsc" }, { Opt_nofscache, "nofsc" }, { Opt_migration, "migration" }, { Opt_nomigration, "nomigration" }, { Opt_port, "port=%s" }, { Opt_rsize, "rsize=%s" }, { Opt_wsize, "wsize=%s" }, { Opt_bsize, "bsize=%s" }, { Opt_timeo, "timeo=%s" }, { Opt_retrans, "retrans=%s" }, { Opt_acregmin, "acregmin=%s" }, { Opt_acregmax, "acregmax=%s" }, { Opt_acdirmin, "acdirmin=%s" }, { Opt_acdirmax, "acdirmax=%s" }, { Opt_actimeo, "actimeo=%s" }, { Opt_namelen, "namlen=%s" }, { Opt_mountport, "mountport=%s" }, { Opt_mountvers, "mountvers=%s" }, { Opt_minorversion, "minorversion=%s" }, { Opt_nfsvers, "nfsvers=%s" }, { Opt_nfsvers, "vers=%s" }, { Opt_sec, "sec=%s" }, { Opt_proto, "proto=%s" }, { Opt_mountproto, "mountproto=%s" }, { Opt_addr, "addr=%s" }, { Opt_clientaddr, "clientaddr=%s" }, { Opt_mounthost, "mounthost=%s" }, { Opt_mountaddr, "mountaddr=%s" }, { Opt_lookupcache, "lookupcache=%s" }, { Opt_fscache_uniq, "fsc=%s" }, { Opt_local_lock, "local_lock=%s" }, /* The following needs to be listed after all other options */ { Opt_nfsvers, "v%s" }, { Opt_err, NULL } }; enum { Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, Opt_xprt_rdma6, Opt_xprt_err }; static const match_table_t nfs_xprt_protocol_tokens = { { Opt_xprt_udp, "udp" }, { Opt_xprt_udp6, "udp6" }, { Opt_xprt_tcp, "tcp" }, { Opt_xprt_tcp6, "tcp6" }, { Opt_xprt_rdma, "rdma" }, { Opt_xprt_rdma6, "rdma6" }, { Opt_xprt_err, NULL } }; enum { Opt_sec_none, Opt_sec_sys, Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, Opt_sec_err }; static const match_table_t nfs_secflavor_tokens = { { Opt_sec_none, "none" }, { Opt_sec_none, "null" }, { Opt_sec_sys, "sys" }, { Opt_sec_krb5, "krb5" }, { Opt_sec_krb5i, "krb5i" }, { Opt_sec_krb5p, "krb5p" }, { Opt_sec_lkey, "lkey" }, { Opt_sec_lkeyi, "lkeyi" }, { Opt_sec_lkeyp, "lkeyp" }, { Opt_sec_spkm, "spkm3" }, { Opt_sec_spkmi, "spkm3i" }, { Opt_sec_spkmp, "spkm3p" }, { Opt_sec_err, NULL } }; enum { Opt_lookupcache_all, Opt_lookupcache_positive, Opt_lookupcache_none, Opt_lookupcache_err }; static match_table_t nfs_lookupcache_tokens = { { Opt_lookupcache_all, "all" }, { Opt_lookupcache_positive, "pos" }, { Opt_lookupcache_positive, "positive" }, { Opt_lookupcache_none, "none" }, { Opt_lookupcache_err, NULL } }; enum { Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, Opt_local_lock_none, Opt_local_lock_err }; static match_table_t nfs_local_lock_tokens = { { Opt_local_lock_all, "all" }, { Opt_local_lock_flock, "flock" }, { Opt_local_lock_posix, "posix" }, { Opt_local_lock_none, "none" }, { Opt_local_lock_err, NULL } }; enum { Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, Opt_vers_4_1, Opt_vers_4_2, Opt_vers_err }; static match_table_t nfs_vers_tokens = { { Opt_vers_2, "2" }, { Opt_vers_3, "3" }, { Opt_vers_4, "4" }, { Opt_vers_4_0, "4.0" }, { Opt_vers_4_1, "4.1" }, { Opt_vers_4_2, "4.2" }, { Opt_vers_err, NULL } }; static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data); struct file_system_type nfs_fs_type = { .owner = THIS_MODULE, .name = "nfs", .mount = nfs_fs_mount, .kill_sb = nfs_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, }; MODULE_ALIAS_FS("nfs"); EXPORT_SYMBOL_GPL(nfs_fs_type); struct file_system_type nfs_xdev_fs_type = { .owner = THIS_MODULE, .name = "nfs", .mount = nfs_xdev_mount, .kill_sb = nfs_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, }; const struct super_operations nfs_sops = { .alloc_inode = nfs_alloc_inode, .destroy_inode = nfs_destroy_inode, .write_inode = nfs_write_inode, .drop_inode = nfs_drop_inode, .statfs = nfs_statfs, .evict_inode = nfs_evict_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, .show_devname = nfs_show_devname, .show_path = nfs_show_path, .show_stats = nfs_show_stats, .remount_fs = nfs_remount, }; EXPORT_SYMBOL_GPL(nfs_sops); #if IS_ENABLED(CONFIG_NFS_V4) static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); static int nfs4_validate_mount_data(void *options, struct nfs_parsed_mount_data *args, const char *dev_name); struct file_system_type nfs4_fs_type = { .owner = THIS_MODULE, .name = "nfs4", .mount = nfs_fs_mount, .kill_sb = nfs_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, }; MODULE_ALIAS_FS("nfs4"); MODULE_ALIAS("nfs4"); EXPORT_SYMBOL_GPL(nfs4_fs_type); static int __init register_nfs4_fs(void) { return register_filesystem(&nfs4_fs_type); } static void unregister_nfs4_fs(void) { unregister_filesystem(&nfs4_fs_type); } #else static int __init register_nfs4_fs(void) { return 0; } static void unregister_nfs4_fs(void) { } #endif static struct shrinker acl_shrinker = { .count_objects = nfs_access_cache_count, .scan_objects = nfs_access_cache_scan, .seeks = DEFAULT_SEEKS, }; /* * Register the NFS filesystems */ int __init register_nfs_fs(void) { int ret; ret = register_filesystem(&nfs_fs_type); if (ret < 0) goto error_0; ret = register_nfs4_fs(); if (ret < 0) goto error_1; ret = nfs_register_sysctl(); if (ret < 0) goto error_2; ret = register_shrinker(&acl_shrinker); if (ret < 0) goto error_3; return 0; error_3: nfs_unregister_sysctl(); error_2: unregister_nfs4_fs(); error_1: unregister_filesystem(&nfs_fs_type); error_0: return ret; } /* * Unregister the NFS filesystems */ void __exit unregister_nfs_fs(void) { unregister_shrinker(&acl_shrinker); nfs_unregister_sysctl(); unregister_nfs4_fs(); unregister_filesystem(&nfs_fs_type); } bool nfs_sb_active(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); if (!atomic_inc_not_zero(&sb->s_active)) return false; if (atomic_inc_return(&server->active) != 1) atomic_dec(&sb->s_active); return true; } EXPORT_SYMBOL_GPL(nfs_sb_active); void nfs_sb_deactive(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); if (atomic_dec_and_test(&server->active)) deactivate_super(sb); } EXPORT_SYMBOL_GPL(nfs_sb_deactive); /* * Deliver file system statistics to userspace */ int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct nfs_server *server = NFS_SB(dentry->d_sb); unsigned char blockbits; unsigned long blockres; struct nfs_fh *fh = NFS_FH(d_inode(dentry)); struct nfs_fsstat res; int error = -ENOMEM; res.fattr = nfs_alloc_fattr(); if (res.fattr == NULL) goto out_err; error = server->nfs_client->rpc_ops->statfs(server, fh, &res); if (unlikely(error == -ESTALE)) { struct dentry *pd_dentry; pd_dentry = dget_parent(dentry); if (pd_dentry != NULL) { nfs_zap_caches(d_inode(pd_dentry)); dput(pd_dentry); } } nfs_free_fattr(res.fattr); if (error < 0) goto out_err; buf->f_type = NFS_SUPER_MAGIC; /* * Current versions of glibc do not correctly handle the * case where f_frsize != f_bsize. Eventually we want to * report the value of wtmult in this field. */ buf->f_frsize = dentry->d_sb->s_blocksize; /* * On most *nix systems, f_blocks, f_bfree, and f_bavail * are reported in units of f_frsize. Linux hasn't had * an f_frsize field in its statfs struct until recently, * thus historically Linux's sys_statfs reports these * fields in units of f_bsize. */ buf->f_bsize = dentry->d_sb->s_blocksize; blockbits = dentry->d_sb->s_blocksize_bits; blockres = (1 << blockbits) - 1; buf->f_blocks = (res.tbytes + blockres) >> blockbits; buf->f_bfree = (res.fbytes + blockres) >> blockbits; buf->f_bavail = (res.abytes + blockres) >> blockbits; buf->f_files = res.tfiles; buf->f_ffree = res.afiles; buf->f_namelen = server->namelen; return 0; out_err: dprintk("%s: statfs error = %d\n", __func__, -error); return error; } EXPORT_SYMBOL_GPL(nfs_statfs); /* * Map the security flavour number to a name */ static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) { static const struct { rpc_authflavor_t flavour; const char *str; } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ { RPC_AUTH_NULL, "null" }, { RPC_AUTH_UNIX, "sys" }, { RPC_AUTH_GSS_KRB5, "krb5" }, { RPC_AUTH_GSS_KRB5I, "krb5i" }, { RPC_AUTH_GSS_KRB5P, "krb5p" }, { RPC_AUTH_GSS_LKEY, "lkey" }, { RPC_AUTH_GSS_LKEYI, "lkeyi" }, { RPC_AUTH_GSS_LKEYP, "lkeyp" }, { RPC_AUTH_GSS_SPKM, "spkm" }, { RPC_AUTH_GSS_SPKMI, "spkmi" }, { RPC_AUTH_GSS_SPKMP, "spkmp" }, { UINT_MAX, "unknown" } }; int i; for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { if (sec_flavours[i].flavour == flavour) break; } return sec_flavours[i].str; } static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; seq_printf(m, ",mountproto="); switch (sap->sa_family) { case AF_INET: switch (nfss->mountd_protocol) { case IPPROTO_UDP: seq_printf(m, RPCBIND_NETID_UDP); break; case IPPROTO_TCP: seq_printf(m, RPCBIND_NETID_TCP); break; default: if (showdefaults) seq_printf(m, "auto"); } break; case AF_INET6: switch (nfss->mountd_protocol) { case IPPROTO_UDP: seq_printf(m, RPCBIND_NETID_UDP6); break; case IPPROTO_TCP: seq_printf(m, RPCBIND_NETID_TCP6); break; default: if (showdefaults) seq_printf(m, "auto"); } break; default: if (showdefaults) seq_printf(m, "auto"); } } static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) return; switch (sap->sa_family) { case AF_INET: { struct sockaddr_in *sin = (struct sockaddr_in *)sap; seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); break; } case AF_INET6: { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); break; } default: if (showdefaults) seq_printf(m, ",mountaddr=unspecified"); } if (nfss->mountd_version || showdefaults) seq_printf(m, ",mountvers=%u", nfss->mountd_version); if ((nfss->mountd_port && nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || showdefaults) seq_printf(m, ",mountport=%u", nfss->mountd_port); nfs_show_mountd_netid(m, nfss, showdefaults); } #if IS_ENABLED(CONFIG_NFS_V4) static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { struct nfs_client *clp = nfss->nfs_client; seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); } #else static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { } #endif static void nfs_show_nfs_version(struct seq_file *m, unsigned int version, unsigned int minorversion) { seq_printf(m, ",vers=%u", version); if (version == 4) seq_printf(m, ".%u", minorversion); } /* * Describe the mount options in force on this server representation */ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { static const struct proc_nfs_info { int flag; const char *str; const char *nostr; } nfs_info[] = { { NFS_MOUNT_SOFT, ",soft", ",hard" }, { NFS_MOUNT_POSIX, ",posix", "" }, { NFS_MOUNT_NOCTO, ",nocto", "" }, { NFS_MOUNT_NOAC, ",noac", "" }, { NFS_MOUNT_NONLM, ",nolock", "" }, { NFS_MOUNT_NOACL, ",noacl", "" }, { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, { 0, NULL, NULL } }; const struct proc_nfs_info *nfs_infop; struct nfs_client *clp = nfss->nfs_client; u32 version = clp->rpc_ops->version; int local_flock, local_fcntl; nfs_show_nfs_version(m, version, clp->cl_minorversion); seq_printf(m, ",rsize=%u", nfss->rsize); seq_printf(m, ",wsize=%u", nfss->wsize); if (nfss->bsize != 0) seq_printf(m, ",bsize=%u", nfss->bsize); seq_printf(m, ",namlen=%u", nfss->namelen); if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { if (nfss->flags & nfs_infop->flag) seq_puts(m, nfs_infop->str); else seq_puts(m, nfs_infop->nostr); } rcu_read_lock(); seq_printf(m, ",proto=%s", rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); rcu_read_unlock(); if (version == 4) { if (nfss->port != NFS_PORT) seq_printf(m, ",port=%u", nfss->port); } else if (nfss->port) seq_printf(m, ",port=%u", nfss->port); seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); if (version != 4) nfs_show_mountd_options(m, nfss, showdefaults); else nfs_show_nfsv4_options(m, nfss, showdefaults); if (nfss->options & NFS_OPTION_FSCACHE) seq_printf(m, ",fsc"); if (nfss->options & NFS_OPTION_MIGRATION) seq_printf(m, ",migration"); if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) seq_printf(m, ",lookupcache=none"); else seq_printf(m, ",lookupcache=pos"); } local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; if (!local_flock && !local_fcntl) seq_printf(m, ",local_lock=none"); else if (local_flock && local_fcntl) seq_printf(m, ",local_lock=all"); else if (local_flock) seq_printf(m, ",local_lock=flock"); else seq_printf(m, ",local_lock=posix"); } /* * Describe the mount options on this VFS mountpoint */ int nfs_show_options(struct seq_file *m, struct dentry *root) { struct nfs_server *nfss = NFS_SB(root->d_sb); nfs_show_mount_options(m, nfss, 0); rcu_read_lock(); seq_printf(m, ",addr=%s", rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, RPC_DISPLAY_ADDR)); rcu_read_unlock(); return 0; } EXPORT_SYMBOL_GPL(nfs_show_options); #if IS_ENABLED(CONFIG_NFS_V4) #ifdef CONFIG_NFS_V4_1 static void show_sessions(struct seq_file *m, struct nfs_server *server) { if (nfs4_has_session(server->nfs_client)) seq_printf(m, ",sessions"); } #else static void show_sessions(struct seq_file *m, struct nfs_server *server) {} #endif #endif #ifdef CONFIG_NFS_V4_1 static void show_pnfs(struct seq_file *m, struct nfs_server *server) { seq_printf(m, ",pnfs="); if (server->pnfs_curr_ld) seq_printf(m, "%s", server->pnfs_curr_ld->name); else seq_printf(m, "not configured"); } static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) { if (nfss->nfs_client && nfss->nfs_client->cl_implid) { struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," "date='%llu,%u'", impl_id->name, impl_id->domain, impl_id->date.seconds, impl_id->date.nseconds); } } #else #if IS_ENABLED(CONFIG_NFS_V4) static void show_pnfs(struct seq_file *m, struct nfs_server *server) { } #endif static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) { } #endif int nfs_show_devname(struct seq_file *m, struct dentry *root) { char *page = (char *) __get_free_page(GFP_KERNEL); char *devname, *dummy; int err = 0; if (!page) return -ENOMEM; devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); if (IS_ERR(devname)) err = PTR_ERR(devname); else seq_escape(m, devname, " \t\n\\"); free_page((unsigned long)page); return err; } EXPORT_SYMBOL_GPL(nfs_show_devname); int nfs_show_path(struct seq_file *m, struct dentry *dentry) { seq_puts(m, "/"); return 0; } EXPORT_SYMBOL_GPL(nfs_show_path); /* * Present statistical information for this VFS mountpoint */ int nfs_show_stats(struct seq_file *m, struct dentry *root) { int i, cpu; struct nfs_server *nfss = NFS_SB(root->d_sb); struct rpc_auth *auth = nfss->client->cl_auth; struct nfs_iostats totals = { }; seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); /* * Display all mount option settings */ seq_printf(m, "\n\topts:\t"); seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); nfs_show_mount_options(m, nfss, 1); seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); show_implementation_id(m, nfss); seq_printf(m, "\n\tcaps:\t"); seq_printf(m, "caps=0x%x", nfss->caps); seq_printf(m, ",wtmult=%u", nfss->wtmult); seq_printf(m, ",dtsize=%u", nfss->dtsize); seq_printf(m, ",bsize=%u", nfss->bsize); seq_printf(m, ",namlen=%u", nfss->namelen); #if IS_ENABLED(CONFIG_NFS_V4) if (nfss->nfs_client->rpc_ops->version == 4) { seq_printf(m, "\n\tnfsv4:\t"); seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); show_sessions(m, nfss); show_pnfs(m, nfss); } #endif /* * Display security flavor in effect for this mount */ seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); if (auth->au_flavor) seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); /* * Display superblock I/O counters */ for_each_possible_cpu(cpu) { struct nfs_iostats *stats; preempt_disable(); stats = per_cpu_ptr(nfss->io_stats, cpu); for (i = 0; i < __NFSIOS_COUNTSMAX; i++) totals.events[i] += stats->events[i]; for (i = 0; i < __NFSIOS_BYTESMAX; i++) totals.bytes[i] += stats->bytes[i]; #ifdef CONFIG_NFS_FSCACHE for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) totals.fscache[i] += stats->fscache[i]; #endif preempt_enable(); } seq_printf(m, "\n\tevents:\t"); for (i = 0; i < __NFSIOS_COUNTSMAX; i++) seq_printf(m, "%lu ", totals.events[i]); seq_printf(m, "\n\tbytes:\t"); for (i = 0; i < __NFSIOS_BYTESMAX; i++) seq_printf(m, "%Lu ", totals.bytes[i]); #ifdef CONFIG_NFS_FSCACHE if (nfss->options & NFS_OPTION_FSCACHE) { seq_printf(m, "\n\tfsc:\t"); for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) seq_printf(m, "%Lu ", totals.bytes[i]); } #endif seq_printf(m, "\n"); rpc_print_iostats(m, nfss->client); return 0; } EXPORT_SYMBOL_GPL(nfs_show_stats); /* * Begin unmount by attempting to remove all automounted mountpoints we added * in response to xdev traversals and referrals */ void nfs_umount_begin(struct super_block *sb) { struct nfs_server *server; struct rpc_clnt *rpc; server = NFS_SB(sb); /* -EIO all pending I/O */ rpc = server->client_acl; if (!IS_ERR(rpc)) rpc_killall_tasks(rpc); rpc = server->client; if (!IS_ERR(rpc)) rpc_killall_tasks(rpc); } EXPORT_SYMBOL_GPL(nfs_umount_begin); static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) { struct nfs_parsed_mount_data *data; data = kzalloc(sizeof(*data), GFP_KERNEL); if (data) { data->acregmin = NFS_DEF_ACREGMIN; data->acregmax = NFS_DEF_ACREGMAX; data->acdirmin = NFS_DEF_ACDIRMIN; data->acdirmax = NFS_DEF_ACDIRMAX; data->mount_server.port = NFS_UNSPEC_PORT; data->nfs_server.port = NFS_UNSPEC_PORT; data->nfs_server.protocol = XPRT_TRANSPORT_TCP; data->selected_flavor = RPC_AUTH_MAXFLAVOR; data->minorversion = 0; data->need_mount = true; data->net = current->nsproxy->net_ns; security_init_mnt_opts(&data->lsm_opts); } return data; } static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) { if (data) { kfree(data->client_address); kfree(data->mount_server.hostname); kfree(data->nfs_server.export_path); kfree(data->nfs_server.hostname); kfree(data->fscache_uniq); security_free_mnt_opts(&data->lsm_opts); kfree(data); } } /* * Sanity-check a server address provided by the mount command. * * Address family must be initialized, and address must not be * the ANY address for that family. */ static int nfs_verify_server_address(struct sockaddr *addr) { switch (addr->sa_family) { case AF_INET: { struct sockaddr_in *sa = (struct sockaddr_in *)addr; return sa->sin_addr.s_addr != htonl(INADDR_ANY); } case AF_INET6: { struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; return !ipv6_addr_any(sa); } } dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); return 0; } /* * Select between a default port value and a user-specified port value. * If a zero value is set, then autobind will be used. */ static void nfs_set_port(struct sockaddr *sap, int *port, const unsigned short default_port) { if (*port == NFS_UNSPEC_PORT) *port = default_port; rpc_set_port(sap, *port); } /* * Sanity check the NFS transport protocol. * */ static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) { switch (mnt->nfs_server.protocol) { case XPRT_TRANSPORT_UDP: case XPRT_TRANSPORT_TCP: case XPRT_TRANSPORT_RDMA: break; default: mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; } } /* * For text based NFSv2/v3 mounts, the mount protocol transport default * settings should depend upon the specified NFS transport. */ static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) { nfs_validate_transport_protocol(mnt); if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) return; switch (mnt->nfs_server.protocol) { case XPRT_TRANSPORT_UDP: mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; break; case XPRT_TRANSPORT_TCP: case XPRT_TRANSPORT_RDMA: mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; } } /* * Add 'flavor' to 'auth_info' if not already present. * Returns true if 'flavor' ends up in the list, false otherwise */ static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, rpc_authflavor_t flavor) { unsigned int i; unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); /* make sure this flavor isn't already in the list */ for (i = 0; i < auth_info->flavor_len; i++) { if (flavor == auth_info->flavors[i]) return true; } if (auth_info->flavor_len + 1 >= max_flavor_len) { dfprintk(MOUNT, "NFS: too many sec= flavors\n"); return false; } auth_info->flavors[auth_info->flavor_len++] = flavor; return true; } /* * Return true if 'match' is in auth_info or auth_info is empty. * Return false otherwise. */ bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, rpc_authflavor_t match) { int i; if (!auth_info->flavor_len) return true; for (i = 0; i < auth_info->flavor_len; i++) { if (auth_info->flavors[i] == match) return true; } return false; } EXPORT_SYMBOL_GPL(nfs_auth_info_match); /* * Parse the value of the 'sec=' option. */ static int nfs_parse_security_flavors(char *value, struct nfs_parsed_mount_data *mnt) { substring_t args[MAX_OPT_ARGS]; rpc_authflavor_t pseudoflavor; char *p; dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); while ((p = strsep(&value, ":")) != NULL) { switch (match_token(p, nfs_secflavor_tokens, args)) { case Opt_sec_none: pseudoflavor = RPC_AUTH_NULL; break; case Opt_sec_sys: pseudoflavor = RPC_AUTH_UNIX; break; case Opt_sec_krb5: pseudoflavor = RPC_AUTH_GSS_KRB5; break; case Opt_sec_krb5i: pseudoflavor = RPC_AUTH_GSS_KRB5I; break; case Opt_sec_krb5p: pseudoflavor = RPC_AUTH_GSS_KRB5P; break; case Opt_sec_lkey: pseudoflavor = RPC_AUTH_GSS_LKEY; break; case Opt_sec_lkeyi: pseudoflavor = RPC_AUTH_GSS_LKEYI; break; case Opt_sec_lkeyp: pseudoflavor = RPC_AUTH_GSS_LKEYP; break; case Opt_sec_spkm: pseudoflavor = RPC_AUTH_GSS_SPKM; break; case Opt_sec_spkmi: pseudoflavor = RPC_AUTH_GSS_SPKMI; break; case Opt_sec_spkmp: pseudoflavor = RPC_AUTH_GSS_SPKMP; break; default: dfprintk(MOUNT, "NFS: sec= option '%s' not recognized\n", p); return 0; } if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) return 0; } return 1; } static int nfs_parse_version_string(char *string, struct nfs_parsed_mount_data *mnt, substring_t *args) { mnt->flags &= ~NFS_MOUNT_VER3; switch (match_token(string, nfs_vers_tokens, args)) { case Opt_vers_2: mnt->version = 2; break; case Opt_vers_3: mnt->flags |= NFS_MOUNT_VER3; mnt->version = 3; break; case Opt_vers_4: /* Backward compatibility option. In future, * the mount program should always supply * a NFSv4 minor version number. */ mnt->version = 4; break; case Opt_vers_4_0: mnt->version = 4; mnt->minorversion = 0; break; case Opt_vers_4_1: mnt->version = 4; mnt->minorversion = 1; break; case Opt_vers_4_2: mnt->version = 4; mnt->minorversion = 2; break; default: return 0; } return 1; } static int nfs_get_option_str(substring_t args[], char **option) { kfree(*option); *option = match_strdup(args); return !*option; } static int nfs_get_option_ul(substring_t args[], unsigned long *option) { int rc; char *string; string = match_strdup(args); if (string == NULL) return -ENOMEM; rc = kstrtoul(string, 10, option); kfree(string); return rc; } /* * Error-check and convert a string of mount options from user space into * a data structure. The whole mount string is processed; bad options are * skipped as they are encountered. If there were no errors, return 1; * otherwise return 0 (zero). */ static int nfs_parse_mount_options(char *raw, struct nfs_parsed_mount_data *mnt) { char *p, *string, *secdata; int rc, sloppy = 0, invalid_option = 0; unsigned short protofamily = AF_UNSPEC; unsigned short mountfamily = AF_UNSPEC; if (!raw) { dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); return 1; } dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); secdata = alloc_secdata(); if (!secdata) goto out_nomem; rc = security_sb_copy_data(raw, secdata); if (rc) goto out_security_failure; rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); if (rc) goto out_security_failure; free_secdata(secdata); while ((p = strsep(&raw, ",")) != NULL) { substring_t args[MAX_OPT_ARGS]; unsigned long option; int token; if (!*p) continue; dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); token = match_token(p, nfs_mount_option_tokens, args); switch (token) { /* * boolean options: foo/nofoo */ case Opt_soft: mnt->flags |= NFS_MOUNT_SOFT; break; case Opt_hard: mnt->flags &= ~NFS_MOUNT_SOFT; break; case Opt_posix: mnt->flags |= NFS_MOUNT_POSIX; break; case Opt_noposix: mnt->flags &= ~NFS_MOUNT_POSIX; break; case Opt_cto: mnt->flags &= ~NFS_MOUNT_NOCTO; break; case Opt_nocto: mnt->flags |= NFS_MOUNT_NOCTO; break; case Opt_ac: mnt->flags &= ~NFS_MOUNT_NOAC; break; case Opt_noac: mnt->flags |= NFS_MOUNT_NOAC; break; case Opt_lock: mnt->flags &= ~NFS_MOUNT_NONLM; mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); break; case Opt_nolock: mnt->flags |= NFS_MOUNT_NONLM; mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); break; case Opt_udp: mnt->flags &= ~NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; break; case Opt_tcp: mnt->flags |= NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; break; case Opt_rdma: mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; xprt_load_transport(p); break; case Opt_acl: mnt->flags &= ~NFS_MOUNT_NOACL; break; case Opt_noacl: mnt->flags |= NFS_MOUNT_NOACL; break; case Opt_rdirplus: mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; break; case Opt_nordirplus: mnt->flags |= NFS_MOUNT_NORDIRPLUS; break; case Opt_sharecache: mnt->flags &= ~NFS_MOUNT_UNSHARED; break; case Opt_nosharecache: mnt->flags |= NFS_MOUNT_UNSHARED; break; case Opt_resvport: mnt->flags &= ~NFS_MOUNT_NORESVPORT; break; case Opt_noresvport: mnt->flags |= NFS_MOUNT_NORESVPORT; break; case Opt_fscache: mnt->options |= NFS_OPTION_FSCACHE; kfree(mnt->fscache_uniq); mnt->fscache_uniq = NULL; break; case Opt_nofscache: mnt->options &= ~NFS_OPTION_FSCACHE; kfree(mnt->fscache_uniq); mnt->fscache_uniq = NULL; break; case Opt_migration: mnt->options |= NFS_OPTION_MIGRATION; break; case Opt_nomigration: mnt->options &= NFS_OPTION_MIGRATION; break; /* * options that take numeric values */ case Opt_port: if (nfs_get_option_ul(args, &option) || option > USHRT_MAX) goto out_invalid_value; mnt->nfs_server.port = option; break; case Opt_rsize: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->rsize = option; break; case Opt_wsize: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->wsize = option; break; case Opt_bsize: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->bsize = option; break; case Opt_timeo: if (nfs_get_option_ul(args, &option) || option == 0) goto out_invalid_value; mnt->timeo = option; break; case Opt_retrans: if (nfs_get_option_ul(args, &option) || option == 0) goto out_invalid_value; mnt->retrans = option; break; case Opt_acregmin: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acregmin = option; break; case Opt_acregmax: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acregmax = option; break; case Opt_acdirmin: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acdirmin = option; break; case Opt_acdirmax: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acdirmax = option; break; case Opt_actimeo: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acregmin = mnt->acregmax = mnt->acdirmin = mnt->acdirmax = option; break; case Opt_namelen: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->namlen = option; break; case Opt_mountport: if (nfs_get_option_ul(args, &option) || option > USHRT_MAX) goto out_invalid_value; mnt->mount_server.port = option; break; case Opt_mountvers: if (nfs_get_option_ul(args, &option) || option < NFS_MNT_VERSION || option > NFS_MNT3_VERSION) goto out_invalid_value; mnt->mount_server.version = option; break; case Opt_minorversion: if (nfs_get_option_ul(args, &option)) goto out_invalid_value; if (option > NFS4_MAX_MINOR_VERSION) goto out_invalid_value; mnt->minorversion = option; break; /* * options that take text values */ case Opt_nfsvers: string = match_strdup(args); if (string == NULL) goto out_nomem; rc = nfs_parse_version_string(string, mnt, args); kfree(string); if (!rc) goto out_invalid_value; break; case Opt_sec: string = match_strdup(args); if (string == NULL) goto out_nomem; rc = nfs_parse_security_flavors(string, mnt); kfree(string); if (!rc) { dfprintk(MOUNT, "NFS: unrecognized " "security flavor\n"); return 0; } break; case Opt_proto: string = match_strdup(args); if (string == NULL) goto out_nomem; token = match_token(string, nfs_xprt_protocol_tokens, args); protofamily = AF_INET; switch (token) { case Opt_xprt_udp6: protofamily = AF_INET6; case Opt_xprt_udp: mnt->flags &= ~NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; break; case Opt_xprt_tcp6: protofamily = AF_INET6; case Opt_xprt_tcp: mnt->flags |= NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; break; case Opt_xprt_rdma6: protofamily = AF_INET6; case Opt_xprt_rdma: /* vector side protocols to TCP */ mnt->flags |= NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; xprt_load_transport(string); break; default: dfprintk(MOUNT, "NFS: unrecognized " "transport protocol\n"); kfree(string); return 0; } kfree(string); break; case Opt_mountproto: string = match_strdup(args); if (string == NULL) goto out_nomem; token = match_token(string, nfs_xprt_protocol_tokens, args); kfree(string); mountfamily = AF_INET; switch (token) { case Opt_xprt_udp6: mountfamily = AF_INET6; case Opt_xprt_udp: mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; break; case Opt_xprt_tcp6: mountfamily = AF_INET6; case Opt_xprt_tcp: mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; break; case Opt_xprt_rdma: /* not used for side protocols */ default: dfprintk(MOUNT, "NFS: unrecognized " "transport protocol\n"); return 0; } break; case Opt_addr: string = match_strdup(args); if (string == NULL) goto out_nomem; mnt->nfs_server.addrlen = rpc_pton(mnt->net, string, strlen(string), (struct sockaddr *) &mnt->nfs_server.address, sizeof(mnt->nfs_server.address)); kfree(string); if (mnt->nfs_server.addrlen == 0) goto out_invalid_address; break; case Opt_clientaddr: if (nfs_get_option_str(args, &mnt->client_address)) goto out_nomem; break; case Opt_mounthost: if (nfs_get_option_str(args, &mnt->mount_server.hostname)) goto out_nomem; break; case Opt_mountaddr: string = match_strdup(args); if (string == NULL) goto out_nomem; mnt->mount_server.addrlen = rpc_pton(mnt->net, string, strlen(string), (struct sockaddr *) &mnt->mount_server.address, sizeof(mnt->mount_server.address)); kfree(string); if (mnt->mount_server.addrlen == 0) goto out_invalid_address; break; case Opt_lookupcache: string = match_strdup(args); if (string == NULL) goto out_nomem; token = match_token(string, nfs_lookupcache_tokens, args); kfree(string); switch (token) { case Opt_lookupcache_all: mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); break; case Opt_lookupcache_positive: mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; break; case Opt_lookupcache_none: mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; break; default: dfprintk(MOUNT, "NFS: invalid " "lookupcache argument\n"); return 0; }; break; case Opt_fscache_uniq: if (nfs_get_option_str(args, &mnt->fscache_uniq)) goto out_nomem; mnt->options |= NFS_OPTION_FSCACHE; break; case Opt_local_lock: string = match_strdup(args); if (string == NULL) goto out_nomem; token = match_token(string, nfs_local_lock_tokens, args); kfree(string); switch (token) { case Opt_local_lock_all: mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); break; case Opt_local_lock_flock: mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; break; case Opt_local_lock_posix: mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; break; case Opt_local_lock_none: mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); break; default: dfprintk(MOUNT, "NFS: invalid " "local_lock argument\n"); return 0; }; break; /* * Special options */ case Opt_sloppy: sloppy = 1; dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); break; case Opt_userspace: case Opt_deprecated: dfprintk(MOUNT, "NFS: ignoring mount option " "'%s'\n", p); break; default: invalid_option = 1; dfprintk(MOUNT, "NFS: unrecognized mount option " "'%s'\n", p); } } if (!sloppy && invalid_option) return 0; if (mnt->minorversion && mnt->version != 4) goto out_minorversion_mismatch; if (mnt->options & NFS_OPTION_MIGRATION && (mnt->version != 4 || mnt->minorversion != 0)) goto out_migration_misuse; /* * verify that any proto=/mountproto= options match the address * families in the addr=/mountaddr= options. */ if (protofamily != AF_UNSPEC && protofamily != mnt->nfs_server.address.ss_family) goto out_proto_mismatch; if (mountfamily != AF_UNSPEC) { if (mnt->mount_server.addrlen) { if (mountfamily != mnt->mount_server.address.ss_family) goto out_mountproto_mismatch; } else { if (mountfamily != mnt->nfs_server.address.ss_family) goto out_mountproto_mismatch; } } return 1; out_mountproto_mismatch: printk(KERN_INFO "NFS: mount server address does not match mountproto= " "option\n"); return 0; out_proto_mismatch: printk(KERN_INFO "NFS: server address does not match proto= option\n"); return 0; out_invalid_address: printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); return 0; out_invalid_value: printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); return 0; out_minorversion_mismatch: printk(KERN_INFO "NFS: mount option vers=%u does not support " "minorversion=%u\n", mnt->version, mnt->minorversion); return 0; out_migration_misuse: printk(KERN_INFO "NFS: 'migration' not supported for this NFS version\n"); return 0; out_nomem: printk(KERN_INFO "NFS: not enough memory to parse option\n"); return 0; out_security_failure: free_secdata(secdata); printk(KERN_INFO "NFS: security options invalid: %d\n", rc); return 0; } /* * Ensure that a specified authtype in args->auth_info is supported by * the server. Returns 0 and sets args->selected_flavor if it's ok, and * -EACCES if not. */ static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, rpc_authflavor_t *server_authlist, unsigned int count) { rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; unsigned int i; /* * If the sec= mount option is used, the specified flavor or AUTH_NULL * must be in the list returned by the server. * * AUTH_NULL has a special meaning when it's in the server list - it * means that the server will ignore the rpc creds, so any flavor * can be used. */ for (i = 0; i < count; i++) { flavor = server_authlist[i]; if (nfs_auth_info_match(&args->auth_info, flavor) || flavor == RPC_AUTH_NULL) goto out; } dfprintk(MOUNT, "NFS: specified auth flavors not supported by server\n"); return -EACCES; out: args->selected_flavor = flavor; dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); return 0; } /* * Use the remote server's MOUNT service to request the NFS file handle * corresponding to the provided path. */ static int nfs_request_mount(struct nfs_parsed_mount_data *args, struct nfs_fh *root_fh, rpc_authflavor_t *server_authlist, unsigned int *server_authlist_len) { struct nfs_mount_request request = { .sap = (struct sockaddr *) &args->mount_server.address, .dirpath = args->nfs_server.export_path, .protocol = args->mount_server.protocol, .fh = root_fh, .noresvport = args->flags & NFS_MOUNT_NORESVPORT, .auth_flav_len = server_authlist_len, .auth_flavs = server_authlist, .net = args->net, }; int status; if (args->mount_server.version == 0) { switch (args->version) { default: args->mount_server.version = NFS_MNT3_VERSION; break; case 2: args->mount_server.version = NFS_MNT_VERSION; } } request.version = args->mount_server.version; if (args->mount_server.hostname) request.hostname = args->mount_server.hostname; else request.hostname = args->nfs_server.hostname; /* * Construct the mount server's address. */ if (args->mount_server.address.ss_family == AF_UNSPEC) { memcpy(request.sap, &args->nfs_server.address, args->nfs_server.addrlen); args->mount_server.addrlen = args->nfs_server.addrlen; } request.salen = args->mount_server.addrlen; nfs_set_port(request.sap, &args->mount_server.port, 0); /* * Now ask the mount server to map our export path * to a file handle. */ status = nfs_mount(&request); if (status != 0) { dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", request.hostname, status); return status; } return 0; } static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, struct nfs_subversion *nfs_mod) { int status; unsigned int i; bool tried_auth_unix = false; bool auth_null_in_list = false; struct nfs_server *server = ERR_PTR(-EACCES); struct nfs_parsed_mount_data *args = mount_info->parsed; rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; unsigned int authlist_len = ARRAY_SIZE(authlist); status = nfs_request_mount(args, mount_info->mntfh, authlist, &authlist_len); if (status) return ERR_PTR(status); /* * Was a sec= authflavor specified in the options? First, verify * whether the server supports it, and then just try to use it if so. */ if (args->auth_info.flavor_len > 0) { status = nfs_verify_authflavors(args, authlist, authlist_len); dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); if (status) return ERR_PTR(status); return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); } /* * No sec= option was provided. RFC 2623, section 2.7 suggests we * SHOULD prefer the flavor listed first. However, some servers list * AUTH_NULL first. Avoid ever choosing AUTH_NULL. */ for (i = 0; i < authlist_len; ++i) { rpc_authflavor_t flavor; struct rpcsec_gss_info info; flavor = authlist[i]; switch (flavor) { case RPC_AUTH_UNIX: tried_auth_unix = true; break; case RPC_AUTH_NULL: auth_null_in_list = true; continue; default: if (rpcauth_get_gssinfo(flavor, &info) != 0) continue; /* Fallthrough */ } dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); args->selected_flavor = flavor; server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); if (!IS_ERR(server)) return server; } /* * Nothing we tried so far worked. At this point, give up if we've * already tried AUTH_UNIX or if the server's list doesn't contain * AUTH_NULL */ if (tried_auth_unix || !auth_null_in_list) return server; /* Last chance! Try AUTH_UNIX */ dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); args->selected_flavor = RPC_AUTH_UNIX; return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); } struct dentry *nfs_try_mount(int flags, const char *dev_name, struct nfs_mount_info *mount_info, struct nfs_subversion *nfs_mod) { struct nfs_server *server; if (mount_info->parsed->need_mount) server = nfs_try_mount_request(mount_info, nfs_mod); else server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); if (IS_ERR(server)) return ERR_CAST(server); return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); } EXPORT_SYMBOL_GPL(nfs_try_mount); /* * Split "dev_name" into "hostname:export_path". * * The leftmost colon demarks the split between the server's hostname * and the export path. If the hostname starts with a left square * bracket, then it may contain colons. * * Note: caller frees hostname and export path, even on error. */ static int nfs_parse_devname(const char *dev_name, char **hostname, size_t maxnamlen, char **export_path, size_t maxpathlen) { size_t len; char *end; /* Is the host name protected with square brakcets? */ if (*dev_name == '[') { end = strchr(++dev_name, ']'); if (end == NULL || end[1] != ':') goto out_bad_devname; len = end - dev_name; end++; } else { char *comma; end = strchr(dev_name, ':'); if (end == NULL) goto out_bad_devname; len = end - dev_name; /* kill possible hostname list: not supported */ comma = strchr(dev_name, ','); if (comma != NULL && comma < end) *comma = 0; } if (len > maxnamlen) goto out_hostname; /* N.B. caller will free nfs_server.hostname in all cases */ *hostname = kstrndup(dev_name, len, GFP_KERNEL); if (*hostname == NULL) goto out_nomem; len = strlen(++end); if (len > maxpathlen) goto out_path; *export_path = kstrndup(end, len, GFP_KERNEL); if (!*export_path) goto out_nomem; dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); return 0; out_bad_devname: dfprintk(MOUNT, "NFS: device name not in host:path format\n"); return -EINVAL; out_nomem: dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); return -ENOMEM; out_hostname: dfprintk(MOUNT, "NFS: server hostname too long\n"); return -ENAMETOOLONG; out_path: dfprintk(MOUNT, "NFS: export pathname too long\n"); return -ENAMETOOLONG; } /* * Validate the NFS2/NFS3 mount data * - fills in the mount root filehandle * * For option strings, user space handles the following behaviors: * * + DNS: mapping server host name to IP address ("addr=" option) * * + failure mode: how to behave if a mount request can't be handled * immediately ("fg/bg" option) * * + retry: how often to retry a mount request ("retry=" option) * * + breaking back: trying proto=udp after proto=tcp, v2 after v3, * mountproto=tcp after mountproto=udp, and so on */ static int nfs23_validate_mount_data(void *options, struct nfs_parsed_mount_data *args, struct nfs_fh *mntfh, const char *dev_name) { struct nfs_mount_data *data = (struct nfs_mount_data *)options; struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; if (data == NULL) goto out_no_data; args->version = NFS_DEFAULT_VERSION; switch (data->version) { case 1: data->namlen = 0; case 2: data->bsize = 0; case 3: if (data->flags & NFS_MOUNT_VER3) goto out_no_v3; data->root.size = NFS2_FHSIZE; memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); /* Turn off security negotiation */ extra_flags |= NFS_MOUNT_SECFLAVOUR; case 4: if (data->flags & NFS_MOUNT_SECFLAVOUR) goto out_no_sec; case 5: memset(data->context, 0, sizeof(data->context)); case 6: if (data->flags & NFS_MOUNT_VER3) { if (data->root.size > NFS3_FHSIZE || data->root.size == 0) goto out_invalid_fh; mntfh->size = data->root.size; args->version = 3; } else { mntfh->size = NFS2_FHSIZE; args->version = 2; } memcpy(mntfh->data, data->root.data, mntfh->size); if (mntfh->size < sizeof(mntfh->data)) memset(mntfh->data + mntfh->size, 0, sizeof(mntfh->data) - mntfh->size); /* * Translate to nfs_parsed_mount_data, which nfs_fill_super * can deal with. */ args->flags = data->flags & NFS_MOUNT_FLAGMASK; args->flags |= extra_flags; args->rsize = data->rsize; args->wsize = data->wsize; args->timeo = data->timeo; args->retrans = data->retrans; args->acregmin = data->acregmin; args->acregmax = data->acregmax; args->acdirmin = data->acdirmin; args->acdirmax = data->acdirmax; args->need_mount = false; memcpy(sap, &data->addr, sizeof(data->addr)); args->nfs_server.addrlen = sizeof(data->addr); args->nfs_server.port = ntohs(data->addr.sin_port); if (!nfs_verify_server_address(sap)) goto out_no_address; if (!(data->flags & NFS_MOUNT_TCP)) args->nfs_server.protocol = XPRT_TRANSPORT_UDP; /* N.B. caller will free nfs_server.hostname in all cases */ args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); args->namlen = data->namlen; args->bsize = data->bsize; if (data->flags & NFS_MOUNT_SECFLAVOUR) args->selected_flavor = data->pseudoflavor; else args->selected_flavor = RPC_AUTH_UNIX; if (!args->nfs_server.hostname) goto out_nomem; if (!(data->flags & NFS_MOUNT_NONLM)) args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| NFS_MOUNT_LOCAL_FCNTL); else args->flags |= (NFS_MOUNT_LOCAL_FLOCK| NFS_MOUNT_LOCAL_FCNTL); /* * The legacy version 6 binary mount data from userspace has a * field used only to transport selinux information into the * the kernel. To continue to support that functionality we * have a touch of selinux knowledge here in the NFS code. The * userspace code converted context=blah to just blah so we are * converting back to the full string selinux understands. */ if (data->context[0]){ #ifdef CONFIG_SECURITY_SELINUX int rc; char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); if (!opts_str) return -ENOMEM; strcpy(opts_str, "context="); data->context[NFS_MAX_CONTEXT_LEN] = '\0'; strcat(opts_str, &data->context[0]); rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); kfree(opts_str); if (rc) return rc; #else return -EINVAL; #endif } break; default: return NFS_TEXT_DATA; } return 0; out_no_data: dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); return -EINVAL; out_no_v3: dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", data->version); return -EINVAL; out_no_sec: dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); return -EINVAL; out_nomem: dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); return -ENOMEM; out_no_address: dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); return -EINVAL; out_invalid_fh: dfprintk(MOUNT, "NFS: invalid root filehandle\n"); return -EINVAL; } #if IS_ENABLED(CONFIG_NFS_V4) static int nfs_validate_mount_data(struct file_system_type *fs_type, void *options, struct nfs_parsed_mount_data *args, struct nfs_fh *mntfh, const char *dev_name) { if (fs_type == &nfs_fs_type) return nfs23_validate_mount_data(options, args, mntfh, dev_name); return nfs4_validate_mount_data(options, args, dev_name); } #else static int nfs_validate_mount_data(struct file_system_type *fs_type, void *options, struct nfs_parsed_mount_data *args, struct nfs_fh *mntfh, const char *dev_name) { return nfs23_validate_mount_data(options, args, mntfh, dev_name); } #endif static int nfs_validate_text_mount_data(void *options, struct nfs_parsed_mount_data *args, const char *dev_name) { int port = 0; int max_namelen = PAGE_SIZE; int max_pathlen = NFS_MAXPATHLEN; struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; if (nfs_parse_mount_options((char *)options, args) == 0) return -EINVAL; if (!nfs_verify_server_address(sap)) goto out_no_address; if (args->version == 4) { #if IS_ENABLED(CONFIG_NFS_V4) port = NFS_PORT; max_namelen = NFS4_MAXNAMLEN; max_pathlen = NFS4_MAXPATHLEN; nfs_validate_transport_protocol(args); if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) goto out_invalid_transport_udp; nfs4_validate_mount_flags(args); #else goto out_v4_not_compiled; #endif /* CONFIG_NFS_V4 */ } else nfs_set_mount_transport_protocol(args); nfs_set_port(sap, &args->nfs_server.port, port); return nfs_parse_devname(dev_name, &args->nfs_server.hostname, max_namelen, &args->nfs_server.export_path, max_pathlen); #if !IS_ENABLED(CONFIG_NFS_V4) out_v4_not_compiled: dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); return -EPROTONOSUPPORT; #else out_invalid_transport_udp: dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); return -EINVAL; #endif /* !CONFIG_NFS_V4 */ out_no_address: dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); return -EINVAL; } #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ | NFS_MOUNT_SECURE \ | NFS_MOUNT_TCP \ | NFS_MOUNT_VER3 \ | NFS_MOUNT_KERBEROS \ | NFS_MOUNT_NONLM \ | NFS_MOUNT_BROKEN_SUID \ | NFS_MOUNT_STRICTLOCK \ | NFS_MOUNT_LEGACY_INTERFACE) #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) static int nfs_compare_remount_data(struct nfs_server *nfss, struct nfs_parsed_mount_data *data) { if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || data->rsize != nfss->rsize || data->wsize != nfss->wsize || data->version != nfss->nfs_client->rpc_ops->version || data->minorversion != nfss->nfs_client->cl_minorversion || data->retrans != nfss->client->cl_timeout->to_retries || !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) || data->acregmin != nfss->acregmin / HZ || data->acregmax != nfss->acregmax / HZ || data->acdirmin != nfss->acdirmin / HZ || data->acdirmax != nfss->acdirmax / HZ || data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || data->nfs_server.port != nfss->port || data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, (struct sockaddr *)&nfss->nfs_client->cl_addr)) return -EINVAL; return 0; } int nfs_remount(struct super_block *sb, int *flags, char *raw_data) { int error; struct nfs_server *nfss = sb->s_fs_info; struct nfs_parsed_mount_data *data; struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; u32 nfsvers = nfss->nfs_client->rpc_ops->version; sync_filesystem(sb); /* * Userspace mount programs that send binary options generally send * them populated with default values. We have no way to know which * ones were explicitly specified. Fall back to legacy behavior and * just return success. */ if ((nfsvers == 4 && (!options4 || options4->version == 1)) || (nfsvers <= 3 && (!options || (options->version >= 1 && options->version <= 6)))) return 0; data = kzalloc(sizeof(*data), GFP_KERNEL); if (data == NULL) return -ENOMEM; /* fill out struct with values from existing mount */ data->flags = nfss->flags; data->rsize = nfss->rsize; data->wsize = nfss->wsize; data->retrans = nfss->client->cl_timeout->to_retries; data->selected_flavor = nfss->client->cl_auth->au_flavor; data->acregmin = nfss->acregmin / HZ; data->acregmax = nfss->acregmax / HZ; data->acdirmin = nfss->acdirmin / HZ; data->acdirmax = nfss->acdirmax / HZ; data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; data->nfs_server.port = nfss->port; data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; data->version = nfsvers; data->minorversion = nfss->nfs_client->cl_minorversion; data->net = current->nsproxy->net_ns; memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, data->nfs_server.addrlen); /* overwrite those values with any that were specified */ error = -EINVAL; if (!nfs_parse_mount_options((char *)options, data)) goto out; /* * noac is a special case. It implies -o sync, but that's not * necessarily reflected in the mtab options. do_remount_sb * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the * remount options, so we have to explicitly reset it. */ if (data->flags & NFS_MOUNT_NOAC) *flags |= MS_SYNCHRONOUS; /* compare new mount options with old ones */ error = nfs_compare_remount_data(nfss, data); out: kfree(data); return error; } EXPORT_SYMBOL_GPL(nfs_remount); /* * Initialise the common bits of the superblock */ inline void nfs_initialise_sb(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); sb->s_magic = NFS_SUPER_MAGIC; /* We probably want something more informative here */ snprintf(sb->s_id, sizeof(sb->s_id), "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); if (sb->s_blocksize == 0) sb->s_blocksize = nfs_block_bits(server->wsize, &sb->s_blocksize_bits); sb->s_bdi = &server->backing_dev_info; nfs_super_set_maxbytes(sb, server->maxfilesize); } /* * Finish setting up an NFS2/3 superblock */ void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) { struct nfs_parsed_mount_data *data = mount_info->parsed; struct nfs_server *server = NFS_SB(sb); sb->s_blocksize_bits = 0; sb->s_blocksize = 0; sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; sb->s_op = server->nfs_client->cl_nfs_mod->sops; if (data && data->bsize) sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); if (server->nfs_client->rpc_ops->version != 2) { /* The VFS shouldn't apply the umask to mode bits. We will do * so ourselves when necessary. */ sb->s_flags |= MS_POSIXACL; sb->s_time_gran = 1; } nfs_initialise_sb(sb); } EXPORT_SYMBOL_GPL(nfs_fill_super); /* * Finish setting up a cloned NFS2/3/4 superblock */ void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) { const struct super_block *old_sb = mount_info->cloned->sb; struct nfs_server *server = NFS_SB(sb); sb->s_blocksize_bits = old_sb->s_blocksize_bits; sb->s_blocksize = old_sb->s_blocksize; sb->s_maxbytes = old_sb->s_maxbytes; sb->s_xattr = old_sb->s_xattr; sb->s_op = old_sb->s_op; sb->s_time_gran = 1; if (server->nfs_client->rpc_ops->version != 2) { /* The VFS shouldn't apply the umask to mode bits. We will do * so ourselves when necessary. */ sb->s_flags |= MS_POSIXACL; } nfs_initialise_sb(sb); } static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) { const struct nfs_server *a = s->s_fs_info; const struct rpc_clnt *clnt_a = a->client; const struct rpc_clnt *clnt_b = b->client; if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) goto Ebusy; if (a->nfs_client != b->nfs_client) goto Ebusy; if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) goto Ebusy; if (a->wsize != b->wsize) goto Ebusy; if (a->rsize != b->rsize) goto Ebusy; if (a->acregmin != b->acregmin) goto Ebusy; if (a->acregmax != b->acregmax) goto Ebusy; if (a->acdirmin != b->acdirmin) goto Ebusy; if (a->acdirmax != b->acdirmax) goto Ebusy; if (b->auth_info.flavor_len > 0 && clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) goto Ebusy; return 1; Ebusy: return 0; } struct nfs_sb_mountdata { struct nfs_server *server; int mntflags; }; static int nfs_set_super(struct super_block *s, void *data) { struct nfs_sb_mountdata *sb_mntdata = data; struct nfs_server *server = sb_mntdata->server; int ret; s->s_flags = sb_mntdata->mntflags; s->s_fs_info = server; s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; ret = set_anon_super(s, server); if (ret == 0) server->s_dev = s->s_dev; return ret; } static int nfs_compare_super_address(struct nfs_server *server1, struct nfs_server *server2) { struct sockaddr *sap1, *sap2; struct rpc_xprt *xprt1 = server1->client->cl_xprt; struct rpc_xprt *xprt2 = server2->client->cl_xprt; if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) return 0; sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; if (sap1->sa_family != sap2->sa_family) return 0; switch (sap1->sa_family) { case AF_INET: { struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) return 0; if (sin1->sin_port != sin2->sin_port) return 0; break; } case AF_INET6: { struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) return 0; if (sin1->sin6_port != sin2->sin6_port) return 0; break; } default: return 0; } return 1; } static int nfs_compare_super(struct super_block *sb, void *data) { struct nfs_sb_mountdata *sb_mntdata = data; struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); int mntflags = sb_mntdata->mntflags; if (!nfs_compare_super_address(old, server)) return 0; /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ if (old->flags & NFS_MOUNT_UNSHARED) return 0; if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) return 0; return nfs_compare_mount_options(sb, server, mntflags); } #ifdef CONFIG_NFS_FSCACHE static void nfs_get_cache_cookie(struct super_block *sb, struct nfs_parsed_mount_data *parsed, struct nfs_clone_mount *cloned) { struct nfs_server *nfss = NFS_SB(sb); char *uniq = NULL; int ulen = 0; nfss->fscache_key = NULL; nfss->fscache = NULL; if (parsed) { if (!(parsed->options & NFS_OPTION_FSCACHE)) return; if (parsed->fscache_uniq) { uniq = parsed->fscache_uniq; ulen = strlen(parsed->fscache_uniq); } } else if (cloned) { struct nfs_server *mnt_s = NFS_SB(cloned->sb); if (!(mnt_s->options & NFS_OPTION_FSCACHE)) return; if (mnt_s->fscache_key) { uniq = mnt_s->fscache_key->key.uniquifier; ulen = mnt_s->fscache_key->key.uniq_len; }; } else return; nfs_fscache_get_super_cookie(sb, uniq, ulen); } #else static void nfs_get_cache_cookie(struct super_block *sb, struct nfs_parsed_mount_data *parsed, struct nfs_clone_mount *cloned) { } #endif static int nfs_bdi_register(struct nfs_server *server) { return bdi_register_dev(&server->backing_dev_info, server->s_dev); } int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, struct nfs_mount_info *mount_info) { int error; unsigned long kflags = 0, kflags_out = 0; if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) kflags |= SECURITY_LSM_NATIVE_LABELS; error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, kflags, &kflags_out); if (error) goto err; if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; err: return error; } EXPORT_SYMBOL_GPL(nfs_set_sb_security); int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, struct nfs_mount_info *mount_info) { /* clone any lsm security options from the parent to the new sb */ if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) return -ESTALE; return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); } EXPORT_SYMBOL_GPL(nfs_clone_sb_security); struct dentry *nfs_fs_mount_common(struct nfs_server *server, int flags, const char *dev_name, struct nfs_mount_info *mount_info, struct nfs_subversion *nfs_mod) { struct super_block *s; struct dentry *mntroot = ERR_PTR(-ENOMEM); int (*compare_super)(struct super_block *, void *) = nfs_compare_super; struct nfs_sb_mountdata sb_mntdata = { .mntflags = flags, .server = server, }; int error; if (server->flags & NFS_MOUNT_UNSHARED) compare_super = NULL; /* -o noac implies -o sync */ if (server->flags & NFS_MOUNT_NOAC) sb_mntdata.mntflags |= MS_SYNCHRONOUS; if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) sb_mntdata.mntflags |= MS_SYNCHRONOUS; /* Get a superblock - note that we may end up sharing one that already exists */ s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); if (IS_ERR(s)) { mntroot = ERR_CAST(s); goto out_err_nosb; } if (s->s_fs_info != server) { nfs_free_server(server); server = NULL; } else { error = nfs_bdi_register(server); if (error) { mntroot = ERR_PTR(error); goto error_splat_super; } server->super = s; } if (!s->s_root) { /* initial superblock/root creation */ mount_info->fill_super(s, mount_info); nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); } mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); if (IS_ERR(mntroot)) goto error_splat_super; error = mount_info->set_security(s, mntroot, mount_info); if (error) goto error_splat_root; s->s_flags |= MS_ACTIVE; out: return mntroot; out_err_nosb: nfs_free_server(server); goto out; error_splat_root: dput(mntroot); mntroot = ERR_PTR(error); error_splat_super: deactivate_locked_super(s); goto out; } EXPORT_SYMBOL_GPL(nfs_fs_mount_common); struct dentry *nfs_fs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data) { struct nfs_mount_info mount_info = { .fill_super = nfs_fill_super, .set_security = nfs_set_sb_security, }; struct dentry *mntroot = ERR_PTR(-ENOMEM); struct nfs_subversion *nfs_mod; int error; mount_info.parsed = nfs_alloc_parsed_mount_data(); mount_info.mntfh = nfs_alloc_fhandle(); if (mount_info.parsed == NULL || mount_info.mntfh == NULL) goto out; /* Validate the mount data */ error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); if (error == NFS_TEXT_DATA) error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); if (error < 0) { mntroot = ERR_PTR(error); goto out; } nfs_mod = get_nfs_version(mount_info.parsed->version); if (IS_ERR(nfs_mod)) { mntroot = ERR_CAST(nfs_mod); goto out; } mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); put_nfs_version(nfs_mod); out: nfs_free_parsed_mount_data(mount_info.parsed); nfs_free_fhandle(mount_info.mntfh); return mntroot; } EXPORT_SYMBOL_GPL(nfs_fs_mount); /* * Destroy an NFS2/3 superblock */ void nfs_kill_super(struct super_block *s) { struct nfs_server *server = NFS_SB(s); dev_t dev = s->s_dev; generic_shutdown_super(s); nfs_fscache_release_super_cookie(s); nfs_free_server(server); free_anon_bdev(dev); } EXPORT_SYMBOL_GPL(nfs_kill_super); /* * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) */ static struct dentry * nfs_xdev_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data) { struct nfs_clone_mount *data = raw_data; struct nfs_mount_info mount_info = { .fill_super = nfs_clone_super, .set_security = nfs_clone_sb_security, .cloned = data, }; struct nfs_server *server; struct dentry *mntroot = ERR_PTR(-ENOMEM); struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; dprintk("--> nfs_xdev_mount()\n"); mount_info.mntfh = mount_info.cloned->fh; /* create a new volume representation */ server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); if (IS_ERR(server)) mntroot = ERR_CAST(server); else mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod); dprintk("<-- nfs_xdev_mount() = %ld\n", IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); return mntroot; } #if IS_ENABLED(CONFIG_NFS_V4) static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) { args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); } /* * Validate NFSv4 mount options */ static int nfs4_validate_mount_data(void *options, struct nfs_parsed_mount_data *args, const char *dev_name) { struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; char *c; if (data == NULL) goto out_no_data; args->version = 4; switch (data->version) { case 1: if (data->host_addrlen > sizeof(args->nfs_server.address)) goto out_no_address; if (data->host_addrlen == 0) goto out_no_address; args->nfs_server.addrlen = data->host_addrlen; if (copy_from_user(sap, data->host_addr, data->host_addrlen)) return -EFAULT; if (!nfs_verify_server_address(sap)) goto out_no_address; args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); if (data->auth_flavourlen) { rpc_authflavor_t pseudoflavor; if (data->auth_flavourlen > 1) goto out_inval_auth; if (copy_from_user(&pseudoflavor, data->auth_flavours, sizeof(pseudoflavor))) return -EFAULT; args->selected_flavor = pseudoflavor; } else args->selected_flavor = RPC_AUTH_UNIX; c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); if (IS_ERR(c)) return PTR_ERR(c); args->nfs_server.hostname = c; c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); if (IS_ERR(c)) return PTR_ERR(c); args->nfs_server.export_path = c; dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); c = strndup_user(data->client_addr.data, 16); if (IS_ERR(c)) return PTR_ERR(c); args->client_address = c; /* * Translate to nfs_parsed_mount_data, which nfs4_fill_super * can deal with. */ args->flags = data->flags & NFS4_MOUNT_FLAGMASK; args->rsize = data->rsize; args->wsize = data->wsize; args->timeo = data->timeo; args->retrans = data->retrans; args->acregmin = data->acregmin; args->acregmax = data->acregmax; args->acdirmin = data->acdirmin; args->acdirmax = data->acdirmax; args->nfs_server.protocol = data->proto; nfs_validate_transport_protocol(args); if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) goto out_invalid_transport_udp; break; default: return NFS_TEXT_DATA; } return 0; out_no_data: dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); return -EINVAL; out_inval_auth: dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", data->auth_flavourlen); return -EINVAL; out_no_address: dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); return -EINVAL; out_invalid_transport_udp: dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); return -EINVAL; } /* * NFS v4 module parameters need to stay in the * NFS client for backwards compatibility */ unsigned int nfs_callback_set_tcpport; /* Default cache timeout is 10 minutes */ unsigned int nfs_idmap_cache_timeout = 600; /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ bool nfs4_disable_idmapping = true; unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; unsigned short send_implementation_id = 1; char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; bool recover_lost_locks = false; EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); EXPORT_SYMBOL_GPL(max_session_slots); EXPORT_SYMBOL_GPL(send_implementation_id); EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); EXPORT_SYMBOL_GPL(recover_lost_locks); #define NFS_CALLBACK_MAXPORTNR (65535U) static int param_set_portnr(const char *val, const struct kernel_param *kp) { unsigned long num; int ret; if (!val) return -EINVAL; ret = kstrtoul(val, 0, &num); if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) return -EINVAL; *((unsigned int *)kp->arg) = num; return 0; } static const struct kernel_param_ops param_ops_portnr = { .set = param_set_portnr, .get = param_get_uint, }; #define param_check_portnr(name, p) __param_check(name, p, unsigned int); module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); module_param(nfs_idmap_cache_timeout, int, 0644); module_param(nfs4_disable_idmapping, bool, 0644); module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, NFS4_CLIENT_ID_UNIQ_LEN, 0600); MODULE_PARM_DESC(nfs4_disable_idmapping, "Turn off NFSv4 idmapping when using 'sec=sys'"); module_param(max_session_slots, ushort, 0644); MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " "requests the client will negotiate"); module_param(send_implementation_id, ushort, 0644); MODULE_PARM_DESC(send_implementation_id, "Send implementation ID with NFSv4.1 exchange_id"); MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); module_param(recover_lost_locks, bool, 0644); MODULE_PARM_DESC(recover_lost_locks, "If the server reports that a lock might be lost, " "try to recover it risking data corruption."); #endif /* CONFIG_NFS_V4 */