/* * linux/fs/nfs/super.c * * Copyright (C) 1992 Rick Sladkey * * nfs superblock handling functions * * Modularised by Alan Cox <Alan.Cox@linux.org>, 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/stats.h> #include <linux/sunrpc/metrics.h> #include <linux/sunrpc/xprtsock.h> #include <linux/sunrpc/xprtrdma.h> #include <linux/nfs_fs.h> #include <linux/nfs_mount.h> #include <linux/nfs4_mount.h> #include <linux/lockd/bind.h> #include <linux/smp_lock.h> #include <linux/seq_file.h> #include <linux/mount.h> #include <linux/nfs_idmap.h> #include <linux/vfs.h> #include <linux/inet.h> #include <linux/in6.h> #include <net/ipv6.h> #include <linux/netdevice.h> #include <linux/nfs_xdr.h> #include <linux/magic.h> #include <linux/parser.h> #include <asm/system.h> #include <asm/uaccess.h> #include "nfs4_fs.h" #include "callback.h" #include "delegation.h" #include "iostat.h" #include "internal.h" #define NFSDBG_FACILITY NFSDBG_VFS 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_v2, Opt_v3, Opt_udp, Opt_tcp, Opt_rdma, Opt_acl, Opt_noacl, Opt_rdirplus, Opt_nordirplus, Opt_sharecache, Opt_nosharecache, /* 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_nfsvers, /* Mount options that take string arguments */ Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, Opt_addr, Opt_mountaddr, Opt_clientaddr, Opt_lookupcache, /* 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_v2, "v2" }, { Opt_v3, "v3" }, { 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_port, "port=%u" }, { Opt_rsize, "rsize=%u" }, { Opt_wsize, "wsize=%u" }, { Opt_bsize, "bsize=%u" }, { Opt_timeo, "timeo=%u" }, { Opt_retrans, "retrans=%u" }, { Opt_acregmin, "acregmin=%u" }, { Opt_acregmax, "acregmax=%u" }, { Opt_acdirmin, "acdirmin=%u" }, { Opt_acdirmax, "acdirmax=%u" }, { Opt_actimeo, "actimeo=%u" }, { Opt_namelen, "namlen=%u" }, { Opt_mountport, "mountport=%u" }, { Opt_mountvers, "mountvers=%u" }, { Opt_nfsvers, "nfsvers=%u" }, { Opt_nfsvers, "vers=%u" }, { 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_err, NULL } }; enum { Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma, Opt_xprt_err }; static const match_table_t nfs_xprt_protocol_tokens = { { Opt_xprt_udp, "udp" }, { Opt_xprt_tcp, "tcp" }, { Opt_xprt_rdma, "rdma" }, { 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 } }; static void nfs_umount_begin(struct super_block *); static int nfs_statfs(struct dentry *, struct kstatfs *); static int nfs_show_options(struct seq_file *, struct vfsmount *); static int nfs_show_stats(struct seq_file *, struct vfsmount *); static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); static void nfs_kill_super(struct super_block *); static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); static struct file_system_type nfs_fs_type = { .owner = THIS_MODULE, .name = "nfs", .get_sb = nfs_get_sb, .kill_sb = nfs_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; struct file_system_type nfs_xdev_fs_type = { .owner = THIS_MODULE, .name = "nfs", .get_sb = nfs_xdev_get_sb, .kill_sb = nfs_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; static const struct super_operations nfs_sops = { .alloc_inode = nfs_alloc_inode, .destroy_inode = nfs_destroy_inode, .write_inode = nfs_write_inode, .statfs = nfs_statfs, .clear_inode = nfs_clear_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, .show_stats = nfs_show_stats, .remount_fs = nfs_remount, }; #ifdef CONFIG_NFS_V4 static int nfs4_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); static void nfs4_kill_super(struct super_block *sb); static struct file_system_type nfs4_fs_type = { .owner = THIS_MODULE, .name = "nfs4", .get_sb = nfs4_get_sb, .kill_sb = nfs4_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; struct file_system_type nfs4_xdev_fs_type = { .owner = THIS_MODULE, .name = "nfs4", .get_sb = nfs4_xdev_get_sb, .kill_sb = nfs4_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; struct file_system_type nfs4_referral_fs_type = { .owner = THIS_MODULE, .name = "nfs4", .get_sb = nfs4_referral_get_sb, .kill_sb = nfs4_kill_super, .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; static const struct super_operations nfs4_sops = { .alloc_inode = nfs_alloc_inode, .destroy_inode = nfs_destroy_inode, .write_inode = nfs_write_inode, .statfs = nfs_statfs, .clear_inode = nfs4_clear_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, .show_stats = nfs_show_stats, .remount_fs = nfs_remount, }; #endif static struct shrinker acl_shrinker = { .shrink = nfs_access_cache_shrinker, .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 = nfs_register_sysctl(); if (ret < 0) goto error_1; #ifdef CONFIG_NFS_V4 ret = register_filesystem(&nfs4_fs_type); if (ret < 0) goto error_2; #endif register_shrinker(&acl_shrinker); return 0; #ifdef CONFIG_NFS_V4 error_2: nfs_unregister_sysctl(); #endif 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); #ifdef CONFIG_NFS_V4 unregister_filesystem(&nfs4_fs_type); #endif nfs_unregister_sysctl(); unregister_filesystem(&nfs_fs_type); } void nfs_sb_active(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); if (atomic_inc_return(&server->active) == 1) atomic_inc(&sb->s_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); } /* * Deliver file system statistics to userspace */ static 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(dentry->d_inode); struct nfs_fattr fattr; struct nfs_fsstat res = { .fattr = &fattr, }; int error; error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 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; } /* * 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[] = { { 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_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; switch (sap->sa_family) { case AF_INET: { struct sockaddr_in *sin = (struct sockaddr_in *)sap; seq_printf(m, ",mountaddr=" NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr)); break; } case AF_INET6: { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; seq_printf(m, ",mountaddr=" NIP6_FMT, NIP6(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 || showdefaults) seq_printf(m, ",mountport=%u", nfss->mountd_port); switch (nfss->mountd_protocol) { case IPPROTO_UDP: seq_printf(m, ",mountproto=udp"); break; case IPPROTO_TCP: seq_printf(m, ",mountproto=tcp"); break; default: if (showdefaults) seq_printf(m, ",mountproto=auto"); } } /* * 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_INTR, ",intr", ",nointr" }, { 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", ""}, { 0, NULL, NULL } }; const struct proc_nfs_info *nfs_infop; struct nfs_client *clp = nfss->nfs_client; u32 version = clp->rpc_ops->version; seq_printf(m, ",vers=%u", version); 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); } seq_printf(m, ",proto=%s", rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO)); 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); #ifdef CONFIG_NFS_V4 if (clp->rpc_ops->version == 4) seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); #endif } /* * Describe the mount options on this VFS mountpoint */ static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) { struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); nfs_show_mount_options(m, nfss, 0); seq_printf(m, ",addr=%s", rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, RPC_DISPLAY_ADDR)); return 0; } /* * Present statistical information for this VFS mountpoint */ static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) { int i, cpu; struct nfs_server *nfss = NFS_SB(mnt->mnt_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, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); seq_puts(m, mnt->mnt_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); 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); #ifdef 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, ",acl=0x%x", nfss->acl_bitmask); } #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]; 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]); seq_printf(m, "\n"); rpc_print_iostats(m, nfss->client); return 0; } /* * Begin unmount by attempting to remove all automounted mountpoints we added * in response to xdev traversals and referrals */ static void nfs_umount_begin(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); struct rpc_clnt *rpc; /* -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); } /* * 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); } } return 0; } static void nfs_parse_ipv4_address(char *string, size_t str_len, struct sockaddr *sap, size_t *addr_len) { struct sockaddr_in *sin = (struct sockaddr_in *)sap; u8 *addr = (u8 *)&sin->sin_addr.s_addr; if (str_len <= INET_ADDRSTRLEN) { dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n", (int)str_len, string); sin->sin_family = AF_INET; *addr_len = sizeof(*sin); if (in4_pton(string, str_len, addr, '\0', NULL)) return; } sap->sa_family = AF_UNSPEC; *addr_len = 0; } #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len, const char *delim, struct sockaddr_in6 *sin6) { char *p; size_t len; if ((string + str_len) == delim) return 1; if (*delim != IPV6_SCOPE_DELIMITER) return 0; if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)) return 0; len = (string + str_len) - delim - 1; p = kstrndup(delim + 1, len, GFP_KERNEL); if (p) { unsigned long scope_id = 0; struct net_device *dev; dev = dev_get_by_name(&init_net, p); if (dev != NULL) { scope_id = dev->ifindex; dev_put(dev); } else { if (strict_strtoul(p, 10, &scope_id) == 0) { kfree(p); return 0; } } kfree(p); sin6->sin6_scope_id = scope_id; dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id); return 1; } return 0; } static void nfs_parse_ipv6_address(char *string, size_t str_len, struct sockaddr *sap, size_t *addr_len) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; u8 *addr = (u8 *)&sin6->sin6_addr.in6_u; const char *delim; if (str_len <= INET6_ADDRSTRLEN) { dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n", (int)str_len, string); sin6->sin6_family = AF_INET6; *addr_len = sizeof(*sin6); if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim) != 0) { if (nfs_parse_ipv6_scope_id(string, str_len, delim, sin6) != 0) return; } } sap->sa_family = AF_UNSPEC; *addr_len = 0; } #else static void nfs_parse_ipv6_address(char *string, size_t str_len, struct sockaddr *sap, size_t *addr_len) { sap->sa_family = AF_UNSPEC; *addr_len = 0; } #endif /* * Construct a sockaddr based on the contents of a string that contains * an IP address in presentation format. * * If there is a problem constructing the new sockaddr, set the address * family to AF_UNSPEC. */ void nfs_parse_ip_address(char *string, size_t str_len, struct sockaddr *sap, size_t *addr_len) { unsigned int i, colons; colons = 0; for (i = 0; i < str_len; i++) if (string[i] == ':') colons++; if (colons >= 2) nfs_parse_ipv6_address(string, str_len, sap, addr_len); else nfs_parse_ipv4_address(string, str_len, sap, addr_len); } /* * 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; } } /* * Parse the value of the 'sec=' option. * * The flavor_len setting is for v4 mounts. */ static int nfs_parse_security_flavors(char *value, struct nfs_parsed_mount_data *mnt) { substring_t args[MAX_OPT_ARGS]; dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); switch (match_token(value, nfs_secflavor_tokens, args)) { case Opt_sec_none: mnt->auth_flavor_len = 0; mnt->auth_flavors[0] = RPC_AUTH_NULL; break; case Opt_sec_sys: mnt->auth_flavor_len = 0; mnt->auth_flavors[0] = RPC_AUTH_UNIX; break; case Opt_sec_krb5: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; break; case Opt_sec_krb5i: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; break; case Opt_sec_krb5p: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; break; case Opt_sec_lkey: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; break; case Opt_sec_lkeyi: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; break; case Opt_sec_lkeyp: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; break; case Opt_sec_spkm: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; break; case Opt_sec_spkmi: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; break; case Opt_sec_spkmp: mnt->auth_flavor_len = 1; mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; break; default: return 0; } return 1; } static void nfs_parse_invalid_value(const char *option) { dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option); } /* * 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, errors = 0; 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]; int option, 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; break; case Opt_nolock: mnt->flags |= NFS_MOUNT_NONLM; break; case Opt_v2: mnt->flags &= ~NFS_MOUNT_VER3; break; case Opt_v3: mnt->flags |= NFS_MOUNT_VER3; 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; 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; /* * options that take numeric values */ case Opt_port: if (match_int(args, &option) || option < 0 || option > USHORT_MAX) { errors++; nfs_parse_invalid_value("port"); } else mnt->nfs_server.port = option; break; case Opt_rsize: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("rsize"); } else mnt->rsize = option; break; case Opt_wsize: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("wsize"); } else mnt->wsize = option; break; case Opt_bsize: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("bsize"); } else mnt->bsize = option; break; case Opt_timeo: if (match_int(args, &option) || option <= 0) { errors++; nfs_parse_invalid_value("timeo"); } else mnt->timeo = option; break; case Opt_retrans: if (match_int(args, &option) || option <= 0) { errors++; nfs_parse_invalid_value("retrans"); } else mnt->retrans = option; break; case Opt_acregmin: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("acregmin"); } else mnt->acregmin = option; break; case Opt_acregmax: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("acregmax"); } else mnt->acregmax = option; break; case Opt_acdirmin: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("acdirmin"); } else mnt->acdirmin = option; break; case Opt_acdirmax: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("acdirmax"); } else mnt->acdirmax = option; break; case Opt_actimeo: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("actimeo"); } else mnt->acregmin = mnt->acregmax = mnt->acdirmin = mnt->acdirmax = option; break; case Opt_namelen: if (match_int(args, &option) || option < 0) { errors++; nfs_parse_invalid_value("namlen"); } else mnt->namlen = option; break; case Opt_mountport: if (match_int(args, &option) || option < 0 || option > USHORT_MAX) { errors++; nfs_parse_invalid_value("mountport"); } else mnt->mount_server.port = option; break; case Opt_mountvers: if (match_int(args, &option) || option < NFS_MNT_VERSION || option > NFS_MNT3_VERSION) { errors++; nfs_parse_invalid_value("mountvers"); } else mnt->mount_server.version = option; break; case Opt_nfsvers: if (match_int(args, &option)) { errors++; nfs_parse_invalid_value("nfsvers"); break; } switch (option) { case NFS2_VERSION: mnt->flags &= ~NFS_MOUNT_VER3; break; case NFS3_VERSION: mnt->flags |= NFS_MOUNT_VER3; break; default: errors++; nfs_parse_invalid_value("nfsvers"); } break; /* * options that take text values */ case Opt_sec: string = match_strdup(args); if (string == NULL) goto out_nomem; rc = nfs_parse_security_flavors(string, mnt); kfree(string); if (!rc) { errors++; dfprintk(MOUNT, "NFS: unrecognized " "security flavor\n"); } break; case Opt_proto: string = match_strdup(args); if (string == NULL) goto out_nomem; token = match_token(string, nfs_xprt_protocol_tokens, args); kfree(string); switch (token) { case Opt_xprt_udp: mnt->flags &= ~NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; break; case Opt_xprt_tcp: mnt->flags |= NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; break; case Opt_xprt_rdma: /* vector side protocols to TCP */ mnt->flags |= NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; break; default: errors++; dfprintk(MOUNT, "NFS: unrecognized " "transport protocol\n"); } 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); switch (token) { case Opt_xprt_udp: mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; break; case Opt_xprt_tcp: mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; break; case Opt_xprt_rdma: /* not used for side protocols */ default: errors++; dfprintk(MOUNT, "NFS: unrecognized " "transport protocol\n"); } break; case Opt_addr: string = match_strdup(args); if (string == NULL) goto out_nomem; nfs_parse_ip_address(string, strlen(string), (struct sockaddr *) &mnt->nfs_server.address, &mnt->nfs_server.addrlen); kfree(string); break; case Opt_clientaddr: string = match_strdup(args); if (string == NULL) goto out_nomem; kfree(mnt->client_address); mnt->client_address = string; break; case Opt_mounthost: string = match_strdup(args); if (string == NULL) goto out_nomem; kfree(mnt->mount_server.hostname); mnt->mount_server.hostname = string; break; case Opt_mountaddr: string = match_strdup(args); if (string == NULL) goto out_nomem; nfs_parse_ip_address(string, strlen(string), (struct sockaddr *) &mnt->mount_server.address, &mnt->mount_server.addrlen); kfree(string); 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: errors++; dfprintk(MOUNT, "NFS: invalid " "lookupcache argument\n"); }; 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: errors++; dfprintk(MOUNT, "NFS: unrecognized mount option " "'%s'\n", p); } } if (errors > 0) { dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n", errors, (errors == 1 ? "" : "s")); if (!sloppy) return 0; } return 1; 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; } /* * Use the remote server's MOUNT service to request the NFS file handle * corresponding to the provided path. */ static int nfs_try_mount(struct nfs_parsed_mount_data *args, struct nfs_fh *root_fh) { struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address; char *hostname; int status; if (args->mount_server.version == 0) { if (args->flags & NFS_MOUNT_VER3) args->mount_server.version = NFS_MNT3_VERSION; else args->mount_server.version = NFS_MNT_VERSION; } if (args->mount_server.hostname) hostname = args->mount_server.hostname; else hostname = args->nfs_server.hostname; /* * Construct the mount server's address. */ if (args->mount_server.address.ss_family == AF_UNSPEC) { memcpy(sap, &args->nfs_server.address, args->nfs_server.addrlen); args->mount_server.addrlen = args->nfs_server.addrlen; } /* * autobind will be used if mount_server.port == 0 */ nfs_set_port(sap, args->mount_server.port); /* * Now ask the mount server to map our export path * to a file handle. */ status = nfs_mount(sap, args->mount_server.addrlen, hostname, args->nfs_server.export_path, args->mount_server.version, args->mount_server.protocol, root_fh); if (status == 0) return 0; dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", hostname, status); return status; } static int nfs_parse_simple_hostname(const char *dev_name, char **hostname, size_t maxnamlen, char **export_path, size_t maxpathlen) { size_t len; char *colon, *comma; colon = strchr(dev_name, ':'); if (colon == NULL) goto out_bad_devname; len = colon - dev_name; 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) goto out_nomem; /* kill possible hostname list: not supported */ comma = strchr(*hostname, ','); if (comma != NULL) { if (comma == *hostname) goto out_bad_devname; *comma = '\0'; } colon++; len = strlen(colon); if (len > maxpathlen) goto out_path; *export_path = kstrndup(colon, 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; } /* * Hostname has square brackets around it because it contains one or * more colons. We look for the first closing square bracket, and a * colon must follow it. */ static int nfs_parse_protected_hostname(const char *dev_name, char **hostname, size_t maxnamlen, char **export_path, size_t maxpathlen) { size_t len; char *start, *end; start = (char *)(dev_name + 1); end = strchr(start, ']'); if (end == NULL) goto out_bad_devname; if (*(end + 1) != ':') goto out_bad_devname; len = end - start; if (len > maxnamlen) goto out_hostname; /* N.B. caller will free nfs_server.hostname in all cases */ *hostname = kstrndup(start, len, GFP_KERNEL); if (*hostname == NULL) goto out_nomem; end += 2; len = strlen(end); if (len > maxpathlen) goto out_path; *export_path = kstrndup(end, len, GFP_KERNEL); if (!*export_path) goto out_nomem; 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; } /* * 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) { if (*dev_name == '[') return nfs_parse_protected_hostname(dev_name, hostname, maxnamlen, export_path, maxpathlen); return nfs_parse_simple_hostname(dev_name, hostname, maxnamlen, export_path, maxpathlen); } /* * 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 nfs_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; if (data == NULL) goto out_no_data; args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP); args->rsize = NFS_MAX_FILE_IO_SIZE; args->wsize = NFS_MAX_FILE_IO_SIZE; args->acregmin = NFS_DEF_ACREGMIN; args->acregmax = NFS_DEF_ACREGMAX; args->acdirmin = NFS_DEF_ACDIRMIN; args->acdirmax = NFS_DEF_ACDIRMAX; args->mount_server.port = 0; /* autobind unless user sets port */ args->nfs_server.port = 0; /* autobind unless user sets port */ args->nfs_server.protocol = XPRT_TRANSPORT_TCP; args->auth_flavors[0] = RPC_AUTH_UNIX; 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); 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; } else mntfh->size = NFS2_FHSIZE; 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->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; memcpy(&args->nfs_server.address, &data->addr, sizeof(data->addr)); args->nfs_server.addrlen = sizeof(data->addr); if (!nfs_verify_server_address((struct sockaddr *) &args->nfs_server.address)) 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->auth_flavors[0] = data->pseudoflavor; if (!args->nfs_server.hostname) goto out_nomem; /* * 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: { int status; if (nfs_parse_mount_options((char *)options, args) == 0) return -EINVAL; if (!nfs_verify_server_address((struct sockaddr *) &args->nfs_server.address)) goto out_no_address; nfs_set_port((struct sockaddr *)&args->nfs_server.address, args->nfs_server.port); nfs_set_mount_transport_protocol(args); status = nfs_parse_devname(dev_name, &args->nfs_server.hostname, PAGE_SIZE, &args->nfs_server.export_path, NFS_MAXPATHLEN); if (!status) status = nfs_try_mount(args, mntfh); kfree(args->nfs_server.export_path); args->nfs_server.export_path = NULL; if (status) return status; break; } } #ifndef CONFIG_NFS_V3 if (args->flags & NFS_MOUNT_VER3) goto out_v3_not_compiled; #endif /* !CONFIG_NFS_V3 */ 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; #ifndef CONFIG_NFS_V3 out_v3_not_compiled: dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); return -EPROTONOSUPPORT; #endif /* !CONFIG_NFS_V3 */ 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; } static int nfs_compare_remount_data(struct nfs_server *nfss, struct nfs_parsed_mount_data *data) { if (data->flags != nfss->flags || data->rsize != nfss->rsize || data->wsize != nfss->wsize || data->retrans != nfss->client->cl_timeout->to_retries || data->auth_flavors[0] != 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.addrlen != nfss->nfs_client->cl_addrlen || memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr, data->nfs_server.addrlen) != 0) return -EINVAL; return 0; } static 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; /* * 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->auth_flavors[0] = 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.addrlen = nfss->nfs_client->cl_addrlen; memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, data->nfs_server.addrlen); /* overwrite those values with any that were specified */ error = nfs_parse_mount_options((char *)options, data); if (error < 0) goto out; /* compare new mount options with old ones */ error = nfs_compare_remount_data(nfss, data); out: kfree(data); return error; } /* * Initialise the common bits of the superblock */ static 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), "%x:%x", 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); if (server->flags & NFS_MOUNT_NOAC) sb->s_flags |= MS_SYNCHRONOUS; nfs_super_set_maxbytes(sb, server->maxfilesize); } /* * Finish setting up an NFS2/3 superblock */ static void nfs_fill_super(struct super_block *sb, struct nfs_parsed_mount_data *data) { struct nfs_server *server = NFS_SB(sb); sb->s_blocksize_bits = 0; sb->s_blocksize = 0; if (data->bsize) sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); if (server->flags & NFS_MOUNT_VER3) { /* 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; } sb->s_op = &nfs_sops; nfs_initialise_sb(sb); } /* * Finish setting up a cloned NFS2/3 superblock */ static void nfs_clone_super(struct super_block *sb, const struct super_block *old_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; if (server->flags & NFS_MOUNT_VER3) { /* 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; } sb->s_op = old_sb->s_op; nfs_initialise_sb(sb); } #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 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) 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 (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; 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; 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); } static int nfs_bdi_register(struct nfs_server *server) { return bdi_register_dev(&server->backing_dev_info, server->s_dev); } static int nfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { struct nfs_server *server = NULL; struct super_block *s; struct nfs_parsed_mount_data *data; struct nfs_fh *mntfh; struct dentry *mntroot; int (*compare_super)(struct super_block *, void *) = nfs_compare_super; struct nfs_sb_mountdata sb_mntdata = { .mntflags = flags, }; int error = -ENOMEM; data = kzalloc(sizeof(*data), GFP_KERNEL); mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); if (data == NULL || mntfh == NULL) goto out_free_fh; security_init_mnt_opts(&data->lsm_opts); /* Validate the mount data */ error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); if (error < 0) goto out; /* Get a volume representation */ server = nfs_create_server(data, mntfh); if (IS_ERR(server)) { error = PTR_ERR(server); goto out; } sb_mntdata.server = server; if (server->flags & NFS_MOUNT_UNSHARED) compare_super = NULL; /* Get a superblock - note that we may end up sharing one that already exists */ s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); if (IS_ERR(s)) { error = PTR_ERR(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) goto error_splat_super; } if (!s->s_root) { /* initial superblock/root creation */ nfs_fill_super(s, data); } mntroot = nfs_get_root(s, mntfh); if (IS_ERR(mntroot)) { error = PTR_ERR(mntroot); goto error_splat_super; } error = security_sb_set_mnt_opts(s, &data->lsm_opts); if (error) goto error_splat_root; s->s_flags |= MS_ACTIVE; mnt->mnt_sb = s; mnt->mnt_root = mntroot; error = 0; out: kfree(data->nfs_server.hostname); kfree(data->mount_server.hostname); security_free_mnt_opts(&data->lsm_opts); out_free_fh: kfree(mntfh); kfree(data); return error; out_err_nosb: nfs_free_server(server); goto out; error_splat_root: dput(mntroot); error_splat_super: up_write(&s->s_umount); deactivate_super(s); goto out; } /* * Destroy an NFS2/3 superblock */ static void nfs_kill_super(struct super_block *s) { struct nfs_server *server = NFS_SB(s); bdi_unregister(&server->backing_dev_info); kill_anon_super(s); nfs_free_server(server); } /* * Clone an NFS2/3 server record on xdev traversal (FSID-change) */ static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { struct nfs_clone_mount *data = raw_data; struct super_block *s; struct nfs_server *server; struct dentry *mntroot; int (*compare_super)(struct super_block *, void *) = nfs_compare_super; struct nfs_sb_mountdata sb_mntdata = { .mntflags = flags, }; int error; dprintk("--> nfs_xdev_get_sb()\n"); /* create a new volume representation */ server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); if (IS_ERR(server)) { error = PTR_ERR(server); goto out_err_noserver; } sb_mntdata.server = server; if (server->flags & NFS_MOUNT_UNSHARED) compare_super = NULL; /* Get a superblock - note that we may end up sharing one that already exists */ s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); if (IS_ERR(s)) { error = PTR_ERR(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) goto error_splat_super; } if (!s->s_root) { /* initial superblock/root creation */ nfs_clone_super(s, data->sb); } mntroot = nfs_get_root(s, data->fh); if (IS_ERR(mntroot)) { error = PTR_ERR(mntroot); goto error_splat_super; } if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { dput(mntroot); error = -ESTALE; goto error_splat_super; } s->s_flags |= MS_ACTIVE; mnt->mnt_sb = s; mnt->mnt_root = mntroot; /* clone any lsm security options from the parent to the new sb */ security_sb_clone_mnt_opts(data->sb, s); dprintk("<-- nfs_xdev_get_sb() = 0\n"); return 0; out_err_nosb: nfs_free_server(server); out_err_noserver: dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); return error; error_splat_super: up_write(&s->s_umount); deactivate_super(s); dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); return error; } #ifdef CONFIG_NFS_V4 /* * Finish setting up a cloned NFS4 superblock */ static void nfs4_clone_super(struct super_block *sb, const struct super_block *old_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_time_gran = 1; sb->s_op = old_sb->s_op; nfs_initialise_sb(sb); } /* * Set up an NFS4 superblock */ static void nfs4_fill_super(struct super_block *sb) { sb->s_time_gran = 1; sb->s_op = &nfs4_sops; nfs_initialise_sb(sb); } /* * Validate NFSv4 mount options */ static int nfs4_validate_mount_data(void *options, struct nfs_parsed_mount_data *args, const char *dev_name) { struct sockaddr_in *ap; struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; char *c; if (data == NULL) goto out_no_data; args->rsize = NFS_MAX_FILE_IO_SIZE; args->wsize = NFS_MAX_FILE_IO_SIZE; args->acregmin = NFS_DEF_ACREGMIN; args->acregmax = NFS_DEF_ACREGMAX; args->acdirmin = NFS_DEF_ACDIRMIN; args->acdirmax = NFS_DEF_ACDIRMAX; args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */ args->auth_flavors[0] = RPC_AUTH_UNIX; args->auth_flavor_len = 0; switch (data->version) { case 1: ap = (struct sockaddr_in *)&args->nfs_server.address; 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(ap, data->host_addr, data->host_addrlen)) return -EFAULT; if (!nfs_verify_server_address((struct sockaddr *) &args->nfs_server.address)) goto out_no_address; if (data->auth_flavourlen) { if (data->auth_flavourlen > 1) goto out_inval_auth; if (copy_from_user(&args->auth_flavors[0], data->auth_flavours, sizeof(args->auth_flavors[0]))) return -EFAULT; } 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); break; default: { int status; if (nfs_parse_mount_options((char *)options, args) == 0) return -EINVAL; if (!nfs_verify_server_address((struct sockaddr *) &args->nfs_server.address)) return -EINVAL; nfs_set_port((struct sockaddr *)&args->nfs_server.address, args->nfs_server.port); nfs_validate_transport_protocol(args); if (args->auth_flavor_len > 1) goto out_inval_auth; if (args->client_address == NULL) goto out_no_client_address; status = nfs_parse_devname(dev_name, &args->nfs_server.hostname, NFS4_MAXNAMLEN, &args->nfs_server.export_path, NFS4_MAXPATHLEN); if (status < 0) return status; break; } } 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_no_client_address: dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n"); return -EINVAL; } /* * Get the superblock for an NFS4 mountpoint */ static int nfs4_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { struct nfs_parsed_mount_data *data; struct super_block *s; struct nfs_server *server; struct nfs_fh *mntfh; struct dentry *mntroot; int (*compare_super)(struct super_block *, void *) = nfs_compare_super; struct nfs_sb_mountdata sb_mntdata = { .mntflags = flags, }; int error = -ENOMEM; data = kzalloc(sizeof(*data), GFP_KERNEL); mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); if (data == NULL || mntfh == NULL) goto out_free_fh; security_init_mnt_opts(&data->lsm_opts); /* Validate the mount data */ error = nfs4_validate_mount_data(raw_data, data, dev_name); if (error < 0) goto out; /* Get a volume representation */ server = nfs4_create_server(data, mntfh); if (IS_ERR(server)) { error = PTR_ERR(server); goto out; } sb_mntdata.server = server; if (server->flags & NFS4_MOUNT_UNSHARED) compare_super = NULL; /* Get a superblock - note that we may end up sharing one that already exists */ s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); if (IS_ERR(s)) { error = PTR_ERR(s); goto out_free; } if (s->s_fs_info != server) { nfs_free_server(server); server = NULL; } else { error = nfs_bdi_register(server); if (error) goto error_splat_super; } if (!s->s_root) { /* initial superblock/root creation */ nfs4_fill_super(s); } mntroot = nfs4_get_root(s, mntfh); if (IS_ERR(mntroot)) { error = PTR_ERR(mntroot); goto error_splat_super; } error = security_sb_set_mnt_opts(s, &data->lsm_opts); if (error) goto error_splat_root; s->s_flags |= MS_ACTIVE; mnt->mnt_sb = s; mnt->mnt_root = mntroot; error = 0; out: kfree(data->client_address); kfree(data->nfs_server.export_path); kfree(data->nfs_server.hostname); security_free_mnt_opts(&data->lsm_opts); out_free_fh: kfree(mntfh); kfree(data); return error; out_free: nfs_free_server(server); goto out; error_splat_root: dput(mntroot); error_splat_super: up_write(&s->s_umount); deactivate_super(s); goto out; } static void nfs4_kill_super(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); nfs_return_all_delegations(sb); kill_anon_super(sb); nfs4_renewd_prepare_shutdown(server); nfs_free_server(server); } /* * Clone an NFS4 server record on xdev traversal (FSID-change) */ static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { struct nfs_clone_mount *data = raw_data; struct super_block *s; struct nfs_server *server; struct dentry *mntroot; int (*compare_super)(struct super_block *, void *) = nfs_compare_super; struct nfs_sb_mountdata sb_mntdata = { .mntflags = flags, }; int error; dprintk("--> nfs4_xdev_get_sb()\n"); /* create a new volume representation */ server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); if (IS_ERR(server)) { error = PTR_ERR(server); goto out_err_noserver; } sb_mntdata.server = server; if (server->flags & NFS4_MOUNT_UNSHARED) compare_super = NULL; /* Get a superblock - note that we may end up sharing one that already exists */ s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); if (IS_ERR(s)) { error = PTR_ERR(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) goto error_splat_super; } if (!s->s_root) { /* initial superblock/root creation */ nfs4_clone_super(s, data->sb); } mntroot = nfs4_get_root(s, data->fh); if (IS_ERR(mntroot)) { error = PTR_ERR(mntroot); goto error_splat_super; } if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { dput(mntroot); error = -ESTALE; goto error_splat_super; } s->s_flags |= MS_ACTIVE; mnt->mnt_sb = s; mnt->mnt_root = mntroot; security_sb_clone_mnt_opts(data->sb, s); dprintk("<-- nfs4_xdev_get_sb() = 0\n"); return 0; out_err_nosb: nfs_free_server(server); out_err_noserver: dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); return error; error_splat_super: up_write(&s->s_umount); deactivate_super(s); dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); return error; } /* * Create an NFS4 server record on referral traversal */ static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { struct nfs_clone_mount *data = raw_data; struct super_block *s; struct nfs_server *server; struct dentry *mntroot; struct nfs_fh mntfh; int (*compare_super)(struct super_block *, void *) = nfs_compare_super; struct nfs_sb_mountdata sb_mntdata = { .mntflags = flags, }; int error; dprintk("--> nfs4_referral_get_sb()\n"); /* create a new volume representation */ server = nfs4_create_referral_server(data, &mntfh); if (IS_ERR(server)) { error = PTR_ERR(server); goto out_err_noserver; } sb_mntdata.server = server; if (server->flags & NFS4_MOUNT_UNSHARED) compare_super = NULL; /* Get a superblock - note that we may end up sharing one that already exists */ s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); if (IS_ERR(s)) { error = PTR_ERR(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) goto error_splat_super; } if (!s->s_root) { /* initial superblock/root creation */ nfs4_fill_super(s); } mntroot = nfs4_get_root(s, &mntfh); if (IS_ERR(mntroot)) { error = PTR_ERR(mntroot); goto error_splat_super; } if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { dput(mntroot); error = -ESTALE; goto error_splat_super; } s->s_flags |= MS_ACTIVE; mnt->mnt_sb = s; mnt->mnt_root = mntroot; security_sb_clone_mnt_opts(data->sb, s); dprintk("<-- nfs4_referral_get_sb() = 0\n"); return 0; out_err_nosb: nfs_free_server(server); out_err_noserver: dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); return error; error_splat_super: up_write(&s->s_umount); deactivate_super(s); dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); return error; } #endif /* CONFIG_NFS_V4 */