| /* |
| * 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/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, |
| |
| /* Mount options that are ignored */ |
| Opt_userspace, Opt_deprecated, |
| |
| Opt_err |
| }; |
| |
| static match_table_t nfs_mount_option_tokens = { |
| { Opt_userspace, "bg" }, |
| { Opt_userspace, "fg" }, |
| { Opt_userspace, "retry=%s" }, |
| |
| { 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_err, NULL } |
| }; |
| |
| enum { |
| Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma, |
| |
| Opt_xprt_err |
| }; |
| |
| static 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 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 } |
| }; |
| |
| |
| 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 void nfs_put_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, |
| .put_super = nfs_put_super, |
| .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 nfs_server *server) |
| { |
| atomic_inc(&server->active); |
| } |
| |
| void nfs_sb_deactive(struct nfs_server *server) |
| { |
| if (atomic_dec_and_test(&server->active)) |
| wake_up(&server->active_wq); |
| } |
| |
| static void nfs_put_super(struct super_block *sb) |
| { |
| struct nfs_server *server = NFS_SB(sb); |
| /* |
| * Make sure there are no outstanding ops to this server. |
| * If so, wait for them to finish before allowing the |
| * unmount to continue. |
| */ |
| wait_event(server->active_wq, atomic_read(&server->active) == 0); |
| } |
| |
| /* |
| * 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; |
| |
| lock_kernel(); |
| |
| 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; |
| |
| unlock_kernel(); |
| return 0; |
| |
| out_err: |
| dprintk("%s: statfs error = %d\n", __func__, -error); |
| unlock_kernel(); |
| 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 != 3*HZ || showdefaults) |
| seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
| if (nfss->acregmax != 60*HZ || showdefaults) |
| seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
| if (nfss->acdirmin != 30*HZ || showdefaults) |
| seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
| if (nfss->acdirmax != 60*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); |
| } |
| |
| /* |
| * Set the port number in an address. Be agnostic about the address family. |
| */ |
| static void nfs_set_port(struct sockaddr *sap, unsigned short port) |
| { |
| switch (sap->sa_family) { |
| case AF_INET: { |
| struct sockaddr_in *ap = (struct sockaddr_in *)sap; |
| ap->sin_port = htons(port); |
| break; |
| } |
| case AF_INET6: { |
| struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; |
| ap->sin6_port = htons(port); |
| break; |
| } |
| } |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * Parse string addresses passed in via a mount option, |
| * and construct a sockaddr based on the result. |
| * |
| * If address parsing fails, set the sockaddr's address |
| * family to AF_UNSPEC to force nfs_verify_server_address() |
| * to punt the mount. |
| */ |
| static void nfs_parse_server_address(char *value, |
| struct sockaddr *sap, |
| size_t *len) |
| { |
| if (strchr(value, ':')) { |
| struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; |
| u8 *addr = (u8 *)&ap->sin6_addr.in6_u; |
| |
| ap->sin6_family = AF_INET6; |
| *len = sizeof(*ap); |
| if (in6_pton(value, -1, addr, '\0', NULL)) |
| return; |
| } else { |
| struct sockaddr_in *ap = (struct sockaddr_in *)sap; |
| u8 *addr = (u8 *)&ap->sin_addr.s_addr; |
| |
| ap->sin_family = AF_INET; |
| *len = sizeof(*ap); |
| if (in4_pton(value, -1, addr, '\0', NULL)) |
| return; |
| } |
| |
| sap->sa_family = AF_UNSPEC; |
| *len = 0; |
| } |
| |
| /* |
| * Error-check and convert a string of mount options from user space into |
| * a data structure |
| */ |
| static int nfs_parse_mount_options(char *raw, |
| struct nfs_parsed_mount_data *mnt) |
| { |
| char *p, *string, *secdata; |
| int rc; |
| |
| 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) { |
| 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; |
| mnt->timeo = 7; |
| mnt->retrans = 5; |
| break; |
| case Opt_tcp: |
| mnt->flags |= NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| mnt->timeo = 600; |
| mnt->retrans = 2; |
| break; |
| case Opt_rdma: |
| mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; |
| mnt->timeo = 600; |
| mnt->retrans = 2; |
| 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_port: |
| if (match_int(args, &option)) |
| return 0; |
| if (option < 0 || option > 65535) |
| return 0; |
| mnt->nfs_server.port = option; |
| break; |
| case Opt_rsize: |
| if (match_int(args, &mnt->rsize)) |
| return 0; |
| break; |
| case Opt_wsize: |
| if (match_int(args, &mnt->wsize)) |
| return 0; |
| break; |
| case Opt_bsize: |
| if (match_int(args, &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| mnt->bsize = option; |
| break; |
| case Opt_timeo: |
| if (match_int(args, &mnt->timeo)) |
| return 0; |
| break; |
| case Opt_retrans: |
| if (match_int(args, &mnt->retrans)) |
| return 0; |
| break; |
| case Opt_acregmin: |
| if (match_int(args, &mnt->acregmin)) |
| return 0; |
| break; |
| case Opt_acregmax: |
| if (match_int(args, &mnt->acregmax)) |
| return 0; |
| break; |
| case Opt_acdirmin: |
| if (match_int(args, &mnt->acdirmin)) |
| return 0; |
| break; |
| case Opt_acdirmax: |
| if (match_int(args, &mnt->acdirmax)) |
| return 0; |
| break; |
| case Opt_actimeo: |
| if (match_int(args, &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| mnt->acregmin = |
| mnt->acregmax = |
| mnt->acdirmin = |
| mnt->acdirmax = option; |
| break; |
| case Opt_namelen: |
| if (match_int(args, &mnt->namlen)) |
| return 0; |
| break; |
| case Opt_mountport: |
| if (match_int(args, &option)) |
| return 0; |
| if (option < 0 || option > 65535) |
| return 0; |
| mnt->mount_server.port = option; |
| break; |
| case Opt_mountvers: |
| if (match_int(args, &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| mnt->mount_server.version = option; |
| break; |
| case Opt_nfsvers: |
| if (match_int(args, &option)) |
| return 0; |
| switch (option) { |
| case 2: |
| mnt->flags &= ~NFS_MOUNT_VER3; |
| break; |
| case 3: |
| mnt->flags |= NFS_MOUNT_VER3; |
| break; |
| default: |
| goto out_unrec_vers; |
| } |
| break; |
| |
| case Opt_sec: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| token = match_token(string, nfs_secflavor_tokens, args); |
| kfree(string); |
| |
| /* |
| * The flags setting is for v2/v3. The flavor_len |
| * setting is for v4. v2/v3 also need to know the |
| * difference between NULL and UNIX. |
| */ |
| switch (token) { |
| case Opt_sec_none: |
| mnt->flags &= ~NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 0; |
| mnt->auth_flavors[0] = RPC_AUTH_NULL; |
| break; |
| case Opt_sec_sys: |
| mnt->flags &= ~NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 0; |
| mnt->auth_flavors[0] = RPC_AUTH_UNIX; |
| break; |
| case Opt_sec_krb5: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; |
| break; |
| case Opt_sec_krb5i: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; |
| break; |
| case Opt_sec_krb5p: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; |
| break; |
| case Opt_sec_lkey: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; |
| break; |
| case Opt_sec_lkeyi: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; |
| break; |
| case Opt_sec_lkeyp: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; |
| break; |
| case Opt_sec_spkm: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; |
| break; |
| case Opt_sec_spkmi: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; |
| break; |
| case Opt_sec_spkmp: |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; |
| break; |
| default: |
| goto out_unrec_sec; |
| } |
| 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; |
| mnt->timeo = 7; |
| mnt->retrans = 5; |
| break; |
| case Opt_xprt_tcp: |
| mnt->flags |= NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| mnt->timeo = 600; |
| mnt->retrans = 2; |
| break; |
| case Opt_xprt_rdma: |
| /* vector side protocols to TCP */ |
| mnt->flags |= NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; |
| mnt->timeo = 600; |
| mnt->retrans = 2; |
| break; |
| default: |
| goto out_unrec_xprt; |
| } |
| 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: |
| goto out_unrec_xprt; |
| } |
| break; |
| case Opt_addr: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| nfs_parse_server_address(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_server_address(string, (struct sockaddr *) |
| &mnt->mount_server.address, |
| &mnt->mount_server.addrlen); |
| kfree(string); |
| break; |
| |
| case Opt_userspace: |
| case Opt_deprecated: |
| dfprintk(MOUNT, "NFS: ignoring mount option " |
| "'%s'\n", p); |
| break; |
| |
| default: |
| goto out_unknown; |
| } |
| } |
| |
| nfs_set_port((struct sockaddr *)&mnt->nfs_server.address, |
| mnt->nfs_server.port); |
| |
| 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; |
| out_unrec_vers: |
| printk(KERN_INFO "NFS: unrecognized NFS version number\n"); |
| return 0; |
| |
| out_unrec_xprt: |
| printk(KERN_INFO "NFS: unrecognized transport protocol\n"); |
| return 0; |
| |
| out_unrec_sec: |
| printk(KERN_INFO "NFS: unrecognized security flavor\n"); |
| return 0; |
| |
| out_unknown: |
| printk(KERN_INFO "NFS: unknown mount option: %s\n", p); |
| 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", |
| hostname, status); |
| return status; |
| } |
| |
| /* |
| * 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->timeo = 600; |
| args->retrans = 2; |
| args->acregmin = 3; |
| args->acregmax = 60; |
| args->acdirmin = 30; |
| args->acdirmax = 60; |
| args->mount_server.port = 0; /* autobind unless user sets port */ |
| args->mount_server.protocol = XPRT_TRANSPORT_UDP; |
| args->nfs_server.port = 0; /* autobind unless user sets port */ |
| args->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| |
| 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; |
| 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; |
| 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: { |
| unsigned int len; |
| char *c; |
| 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; |
| |
| c = strchr(dev_name, ':'); |
| if (c == NULL) |
| return -EINVAL; |
| len = c - dev_name; |
| /* N.B. caller will free nfs_server.hostname in all cases */ |
| args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL); |
| if (!args->nfs_server.hostname) |
| goto out_nomem; |
| |
| c++; |
| if (strlen(c) > NFS_MAXPATHLEN) |
| return -ENAMETOOLONG; |
| args->nfs_server.export_path = c; |
| |
| status = nfs_try_mount(args, mntfh); |
| if (status) |
| return status; |
| |
| break; |
| } |
| } |
| |
| if (!(args->flags & NFS_MOUNT_SECFLAVOUR)) |
| args->auth_flavors[0] = RPC_AUTH_UNIX; |
| |
| #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; |
| |
| /* |
| * 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 ((sb->s_type == &nfs4_fs_type && options4->version == 1) || |
| (sb->s_type == &nfs_fs_type && 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->timeo = 600; |
| args->retrans = 2; |
| args->acregmin = 3; |
| args->acregmax = 60; |
| args->acdirmin = 30; |
| args->acdirmax = 60; |
| args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */ |
| args->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| |
| 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; |
| |
| switch (data->auth_flavourlen) { |
| case 0: |
| args->auth_flavors[0] = RPC_AUTH_UNIX; |
| break; |
| case 1: |
| if (copy_from_user(&args->auth_flavors[0], |
| data->auth_flavours, |
| sizeof(args->auth_flavors[0]))) |
| return -EFAULT; |
| break; |
| default: |
| goto out_inval_auth; |
| } |
| |
| 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; |
| |
| break; |
| default: { |
| unsigned int len; |
| |
| if (nfs_parse_mount_options((char *)options, args) == 0) |
| return -EINVAL; |
| |
| if (!nfs_verify_server_address((struct sockaddr *) |
| &args->nfs_server.address)) |
| return -EINVAL; |
| |
| switch (args->auth_flavor_len) { |
| case 0: |
| args->auth_flavors[0] = RPC_AUTH_UNIX; |
| break; |
| case 1: |
| break; |
| default: |
| goto out_inval_auth; |
| } |
| |
| /* |
| * Split "dev_name" into "hostname:mntpath". |
| */ |
| c = strchr(dev_name, ':'); |
| if (c == NULL) |
| return -EINVAL; |
| /* while calculating len, pretend ':' is '\0' */ |
| len = c - dev_name; |
| if (len > NFS4_MAXNAMLEN) |
| return -ENAMETOOLONG; |
| /* N.B. caller will free nfs_server.hostname in all cases */ |
| args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL); |
| if (!args->nfs_server.hostname) |
| goto out_nomem; |
| |
| c++; /* step over the ':' */ |
| len = strlen(c); |
| if (len > NFS4_MAXPATHLEN) |
| return -ENAMETOOLONG; |
| args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL); |
| if (!args->nfs_server.export_path) |
| goto out_nomem; |
| |
| dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path); |
| |
| if (args->client_address == NULL) |
| goto out_no_client_address; |
| |
| 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_nomem: |
| dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n"); |
| return -ENOMEM; |
| |
| 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(&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 */ |
| 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(&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 */ |
| 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 */ |