| /* |
| * linux/fs/nfs/super.c |
| * |
| * Copyright (C) 1992 Rick Sladkey |
| * |
| * nfs superblock handling functions |
| * |
| * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
| * experimental NFS changes. Modularisation taken straight from SYS5 fs. |
| * |
| * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. |
| * J.S.Peatfield@damtp.cam.ac.uk |
| * |
| * Split from inode.c by David Howells <dhowells@redhat.com> |
| * |
| * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a |
| * particular server are held in the same superblock |
| * - NFS superblocks can have several effective roots to the dentry tree |
| * - directory type roots are spliced into the tree when a path from one root reaches the root |
| * of another (see nfs_lookup()) |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| |
| #include <linux/time.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/string.h> |
| #include <linux/stat.h> |
| #include <linux/errno.h> |
| #include <linux/unistd.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/stats.h> |
| #include <linux/sunrpc/metrics.h> |
| #include <linux/sunrpc/xprtsock.h> |
| #include <linux/sunrpc/xprtrdma.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/nfs_mount.h> |
| #include <linux/nfs4_mount.h> |
| #include <linux/lockd/bind.h> |
| #include <linux/seq_file.h> |
| #include <linux/mount.h> |
| #include <linux/namei.h> |
| #include <linux/nfs_idmap.h> |
| #include <linux/vfs.h> |
| #include <linux/inet.h> |
| #include <linux/in6.h> |
| #include <linux/slab.h> |
| #include <net/ipv6.h> |
| #include <linux/netdevice.h> |
| #include <linux/nfs_xdr.h> |
| #include <linux/magic.h> |
| #include <linux/parser.h> |
| #include <linux/nsproxy.h> |
| #include <linux/rcupdate.h> |
| |
| #include <asm/uaccess.h> |
| |
| #include "nfs4_fs.h" |
| #include "callback.h" |
| #include "delegation.h" |
| #include "iostat.h" |
| #include "internal.h" |
| #include "fscache.h" |
| #include "pnfs.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_VFS |
| #define NFS_TEXT_DATA 1 |
| |
| #ifdef CONFIG_NFS_V3 |
| #define NFS_DEFAULT_VERSION 3 |
| #else |
| #define NFS_DEFAULT_VERSION 2 |
| #endif |
| |
| enum { |
| /* Mount options that take no arguments */ |
| Opt_soft, Opt_hard, |
| Opt_posix, Opt_noposix, |
| Opt_cto, Opt_nocto, |
| Opt_ac, Opt_noac, |
| Opt_lock, Opt_nolock, |
| Opt_udp, Opt_tcp, Opt_rdma, |
| Opt_acl, Opt_noacl, |
| Opt_rdirplus, Opt_nordirplus, |
| Opt_sharecache, Opt_nosharecache, |
| Opt_resvport, Opt_noresvport, |
| Opt_fscache, Opt_nofscache, |
| |
| /* Mount options that take integer arguments */ |
| Opt_port, |
| Opt_rsize, Opt_wsize, Opt_bsize, |
| Opt_timeo, Opt_retrans, |
| Opt_acregmin, Opt_acregmax, |
| Opt_acdirmin, Opt_acdirmax, |
| Opt_actimeo, |
| Opt_namelen, |
| Opt_mountport, |
| Opt_mountvers, |
| Opt_minorversion, |
| |
| /* Mount options that take string arguments */ |
| Opt_nfsvers, |
| Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, |
| Opt_addr, Opt_mountaddr, Opt_clientaddr, |
| Opt_lookupcache, |
| Opt_fscache_uniq, |
| Opt_local_lock, |
| |
| /* Special mount options */ |
| Opt_userspace, Opt_deprecated, Opt_sloppy, |
| |
| Opt_err |
| }; |
| |
| static const match_table_t nfs_mount_option_tokens = { |
| { Opt_userspace, "bg" }, |
| { Opt_userspace, "fg" }, |
| { Opt_userspace, "retry=%s" }, |
| |
| { Opt_sloppy, "sloppy" }, |
| |
| { Opt_soft, "soft" }, |
| { Opt_hard, "hard" }, |
| { Opt_deprecated, "intr" }, |
| { Opt_deprecated, "nointr" }, |
| { Opt_posix, "posix" }, |
| { Opt_noposix, "noposix" }, |
| { Opt_cto, "cto" }, |
| { Opt_nocto, "nocto" }, |
| { Opt_ac, "ac" }, |
| { Opt_noac, "noac" }, |
| { Opt_lock, "lock" }, |
| { Opt_nolock, "nolock" }, |
| { Opt_udp, "udp" }, |
| { Opt_tcp, "tcp" }, |
| { Opt_rdma, "rdma" }, |
| { Opt_acl, "acl" }, |
| { Opt_noacl, "noacl" }, |
| { Opt_rdirplus, "rdirplus" }, |
| { Opt_nordirplus, "nordirplus" }, |
| { Opt_sharecache, "sharecache" }, |
| { Opt_nosharecache, "nosharecache" }, |
| { Opt_resvport, "resvport" }, |
| { Opt_noresvport, "noresvport" }, |
| { Opt_fscache, "fsc" }, |
| { Opt_nofscache, "nofsc" }, |
| |
| { Opt_port, "port=%s" }, |
| { Opt_rsize, "rsize=%s" }, |
| { Opt_wsize, "wsize=%s" }, |
| { Opt_bsize, "bsize=%s" }, |
| { Opt_timeo, "timeo=%s" }, |
| { Opt_retrans, "retrans=%s" }, |
| { Opt_acregmin, "acregmin=%s" }, |
| { Opt_acregmax, "acregmax=%s" }, |
| { Opt_acdirmin, "acdirmin=%s" }, |
| { Opt_acdirmax, "acdirmax=%s" }, |
| { Opt_actimeo, "actimeo=%s" }, |
| { Opt_namelen, "namlen=%s" }, |
| { Opt_mountport, "mountport=%s" }, |
| { Opt_mountvers, "mountvers=%s" }, |
| { Opt_minorversion, "minorversion=%s" }, |
| |
| { Opt_nfsvers, "nfsvers=%s" }, |
| { Opt_nfsvers, "vers=%s" }, |
| |
| { Opt_sec, "sec=%s" }, |
| { Opt_proto, "proto=%s" }, |
| { Opt_mountproto, "mountproto=%s" }, |
| { Opt_addr, "addr=%s" }, |
| { Opt_clientaddr, "clientaddr=%s" }, |
| { Opt_mounthost, "mounthost=%s" }, |
| { Opt_mountaddr, "mountaddr=%s" }, |
| |
| { Opt_lookupcache, "lookupcache=%s" }, |
| { Opt_fscache_uniq, "fsc=%s" }, |
| { Opt_local_lock, "local_lock=%s" }, |
| |
| /* The following needs to be listed after all other options */ |
| { Opt_nfsvers, "v%s" }, |
| |
| { Opt_err, NULL } |
| }; |
| |
| enum { |
| Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, |
| |
| Opt_xprt_err |
| }; |
| |
| static const match_table_t nfs_xprt_protocol_tokens = { |
| { Opt_xprt_udp, "udp" }, |
| { Opt_xprt_udp6, "udp6" }, |
| { Opt_xprt_tcp, "tcp" }, |
| { Opt_xprt_tcp6, "tcp6" }, |
| { Opt_xprt_rdma, "rdma" }, |
| |
| { Opt_xprt_err, NULL } |
| }; |
| |
| enum { |
| Opt_sec_none, Opt_sec_sys, |
| Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, |
| Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, |
| Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, |
| |
| Opt_sec_err |
| }; |
| |
| static const match_table_t nfs_secflavor_tokens = { |
| { Opt_sec_none, "none" }, |
| { Opt_sec_none, "null" }, |
| { Opt_sec_sys, "sys" }, |
| |
| { Opt_sec_krb5, "krb5" }, |
| { Opt_sec_krb5i, "krb5i" }, |
| { Opt_sec_krb5p, "krb5p" }, |
| |
| { Opt_sec_lkey, "lkey" }, |
| { Opt_sec_lkeyi, "lkeyi" }, |
| { Opt_sec_lkeyp, "lkeyp" }, |
| |
| { Opt_sec_spkm, "spkm3" }, |
| { Opt_sec_spkmi, "spkm3i" }, |
| { Opt_sec_spkmp, "spkm3p" }, |
| |
| { Opt_sec_err, NULL } |
| }; |
| |
| enum { |
| Opt_lookupcache_all, Opt_lookupcache_positive, |
| Opt_lookupcache_none, |
| |
| Opt_lookupcache_err |
| }; |
| |
| static match_table_t nfs_lookupcache_tokens = { |
| { Opt_lookupcache_all, "all" }, |
| { Opt_lookupcache_positive, "pos" }, |
| { Opt_lookupcache_positive, "positive" }, |
| { Opt_lookupcache_none, "none" }, |
| |
| { Opt_lookupcache_err, NULL } |
| }; |
| |
| enum { |
| Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, |
| Opt_local_lock_none, |
| |
| Opt_local_lock_err |
| }; |
| |
| static match_table_t nfs_local_lock_tokens = { |
| { Opt_local_lock_all, "all" }, |
| { Opt_local_lock_flock, "flock" }, |
| { Opt_local_lock_posix, "posix" }, |
| { Opt_local_lock_none, "none" }, |
| |
| { Opt_local_lock_err, NULL } |
| }; |
| |
| enum { |
| Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, |
| Opt_vers_4_1, |
| |
| Opt_vers_err |
| }; |
| |
| static match_table_t nfs_vers_tokens = { |
| { Opt_vers_2, "2" }, |
| { Opt_vers_3, "3" }, |
| { Opt_vers_4, "4" }, |
| { Opt_vers_4_0, "4.0" }, |
| { Opt_vers_4_1, "4.1" }, |
| |
| { Opt_vers_err, NULL } |
| }; |
| |
| struct nfs_mount_info { |
| void (*fill_super)(struct super_block *, struct nfs_mount_info *); |
| int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); |
| struct nfs_parsed_mount_data *parsed; |
| struct nfs_clone_mount *cloned; |
| struct nfs_fh *mntfh; |
| }; |
| |
| 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 dentry *); |
| static int nfs_show_devname(struct seq_file *, struct dentry *); |
| static int nfs_show_path(struct seq_file *, struct dentry *); |
| static int nfs_show_stats(struct seq_file *, struct dentry *); |
| static struct dentry *nfs_fs_mount_common(struct file_system_type *, |
| struct nfs_server *, int, const char *, struct nfs_mount_info *); |
| static struct dentry *nfs_fs_mount(struct file_system_type *, |
| int, const char *, void *); |
| static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data); |
| static void nfs_put_super(struct super_block *); |
| 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", |
| .mount = nfs_fs_mount, |
| .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", |
| .mount = nfs_xdev_mount, |
| .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, |
| .evict_inode = nfs_evict_inode, |
| .umount_begin = nfs_umount_begin, |
| .show_options = nfs_show_options, |
| .show_devname = nfs_show_devname, |
| .show_path = nfs_show_path, |
| .show_stats = nfs_show_stats, |
| .remount_fs = nfs_remount, |
| }; |
| |
| #ifdef CONFIG_NFS_V4 |
| static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); |
| static int nfs4_validate_mount_data(void *options, |
| struct nfs_parsed_mount_data *args, const char *dev_name); |
| static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
| struct nfs_mount_info *mount_info); |
| static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data); |
| static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data); |
| static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data); |
| static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data); |
| |
| static struct file_system_type nfs4_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "nfs4", |
| .mount = nfs_fs_mount, |
| .kill_sb = nfs_kill_super, |
| .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
| }; |
| |
| static struct file_system_type nfs4_remote_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "nfs4", |
| .mount = nfs4_remote_mount, |
| .kill_sb = nfs_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", |
| .mount = nfs4_xdev_mount, |
| .kill_sb = nfs_kill_super, |
| .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
| }; |
| |
| static struct file_system_type nfs4_remote_referral_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "nfs4", |
| .mount = nfs4_remote_referral_mount, |
| .kill_sb = nfs_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", |
| .mount = nfs4_referral_mount, |
| .kill_sb = nfs_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, |
| .put_super = nfs_put_super, |
| .statfs = nfs_statfs, |
| .evict_inode = nfs4_evict_inode, |
| .umount_begin = nfs_umount_begin, |
| .show_options = nfs_show_options, |
| .show_devname = nfs_show_devname, |
| .show_path = nfs_show_path, |
| .show_stats = nfs_show_stats, |
| .remount_fs = nfs_remount, |
| }; |
| #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_fsstat res; |
| int error = -ENOMEM; |
| |
| res.fattr = nfs_alloc_fattr(); |
| if (res.fattr == NULL) |
| goto out_err; |
| |
| error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
| if (unlikely(error == -ESTALE)) { |
| struct dentry *pd_dentry; |
| |
| pd_dentry = dget_parent(dentry); |
| if (pd_dentry != NULL) { |
| nfs_zap_caches(pd_dentry->d_inode); |
| dput(pd_dentry); |
| } |
| } |
| nfs_free_fattr(res.fattr); |
| if (error < 0) |
| goto out_err; |
| |
| buf->f_type = NFS_SUPER_MAGIC; |
| |
| /* |
| * Current versions of glibc do not correctly handle the |
| * case where f_frsize != f_bsize. Eventually we want to |
| * report the value of wtmult in this field. |
| */ |
| buf->f_frsize = dentry->d_sb->s_blocksize; |
| |
| /* |
| * On most *nix systems, f_blocks, f_bfree, and f_bavail |
| * are reported in units of f_frsize. Linux hasn't had |
| * an f_frsize field in its statfs struct until recently, |
| * thus historically Linux's sys_statfs reports these |
| * fields in units of f_bsize. |
| */ |
| buf->f_bsize = dentry->d_sb->s_blocksize; |
| blockbits = dentry->d_sb->s_blocksize_bits; |
| blockres = (1 << blockbits) - 1; |
| buf->f_blocks = (res.tbytes + blockres) >> blockbits; |
| buf->f_bfree = (res.fbytes + blockres) >> blockbits; |
| buf->f_bavail = (res.abytes + blockres) >> blockbits; |
| |
| buf->f_files = res.tfiles; |
| buf->f_ffree = res.afiles; |
| |
| buf->f_namelen = server->namelen; |
| |
| return 0; |
| |
| out_err: |
| dprintk("%s: statfs error = %d\n", __func__, -error); |
| return error; |
| } |
| |
| /* |
| * 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_netid(struct seq_file *m, struct nfs_server *nfss, |
| int showdefaults) |
| { |
| struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; |
| |
| seq_printf(m, ",mountproto="); |
| switch (sap->sa_family) { |
| case AF_INET: |
| switch (nfss->mountd_protocol) { |
| case IPPROTO_UDP: |
| seq_printf(m, RPCBIND_NETID_UDP); |
| break; |
| case IPPROTO_TCP: |
| seq_printf(m, RPCBIND_NETID_TCP); |
| break; |
| default: |
| if (showdefaults) |
| seq_printf(m, "auto"); |
| } |
| break; |
| case AF_INET6: |
| switch (nfss->mountd_protocol) { |
| case IPPROTO_UDP: |
| seq_printf(m, RPCBIND_NETID_UDP6); |
| break; |
| case IPPROTO_TCP: |
| seq_printf(m, RPCBIND_NETID_TCP6); |
| break; |
| default: |
| if (showdefaults) |
| seq_printf(m, "auto"); |
| } |
| break; |
| default: |
| if (showdefaults) |
| seq_printf(m, "auto"); |
| } |
| } |
| |
| static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
| int showdefaults) |
| { |
| struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; |
| |
| if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
| return; |
| |
| switch (sap->sa_family) { |
| case AF_INET: { |
| struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
| seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); |
| break; |
| } |
| case AF_INET6: { |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; |
| seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); |
| break; |
| } |
| default: |
| if (showdefaults) |
| seq_printf(m, ",mountaddr=unspecified"); |
| } |
| |
| if (nfss->mountd_version || showdefaults) |
| seq_printf(m, ",mountvers=%u", nfss->mountd_version); |
| if ((nfss->mountd_port && |
| nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || |
| showdefaults) |
| seq_printf(m, ",mountport=%u", nfss->mountd_port); |
| |
| nfs_show_mountd_netid(m, nfss, showdefaults); |
| } |
| |
| #ifdef CONFIG_NFS_V4 |
| static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, |
| int showdefaults) |
| { |
| struct nfs_client *clp = nfss->nfs_client; |
| |
| seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); |
| } |
| #else |
| static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, |
| int showdefaults) |
| { |
| } |
| #endif |
| |
| static void nfs_show_nfs_version(struct seq_file *m, |
| unsigned int version, |
| unsigned int minorversion) |
| { |
| seq_printf(m, ",vers=%u", version); |
| if (version == 4) |
| seq_printf(m, ".%u", minorversion); |
| } |
| |
| /* |
| * Describe the mount options in force on this server representation |
| */ |
| static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
| int showdefaults) |
| { |
| static const struct proc_nfs_info { |
| int flag; |
| const char *str; |
| const char *nostr; |
| } nfs_info[] = { |
| { NFS_MOUNT_SOFT, ",soft", ",hard" }, |
| { NFS_MOUNT_POSIX, ",posix", "" }, |
| { NFS_MOUNT_NOCTO, ",nocto", "" }, |
| { NFS_MOUNT_NOAC, ",noac", "" }, |
| { NFS_MOUNT_NONLM, ",nolock", "" }, |
| { NFS_MOUNT_NOACL, ",noacl", "" }, |
| { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
| { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, |
| { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, |
| { 0, NULL, NULL } |
| }; |
| const struct proc_nfs_info *nfs_infop; |
| struct nfs_client *clp = nfss->nfs_client; |
| u32 version = clp->rpc_ops->version; |
| int local_flock, local_fcntl; |
| |
| nfs_show_nfs_version(m, version, clp->cl_minorversion); |
| seq_printf(m, ",rsize=%u", nfss->rsize); |
| seq_printf(m, ",wsize=%u", nfss->wsize); |
| if (nfss->bsize != 0) |
| seq_printf(m, ",bsize=%u", nfss->bsize); |
| seq_printf(m, ",namlen=%u", nfss->namelen); |
| if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
| seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
| if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
| seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
| if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
| seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
| if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
| seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
| for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
| if (nfss->flags & nfs_infop->flag) |
| seq_puts(m, nfs_infop->str); |
| else |
| seq_puts(m, nfs_infop->nostr); |
| } |
| rcu_read_lock(); |
| seq_printf(m, ",proto=%s", |
| rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
| rcu_read_unlock(); |
| if (version == 4) { |
| if (nfss->port != NFS_PORT) |
| seq_printf(m, ",port=%u", nfss->port); |
| } else |
| if (nfss->port) |
| seq_printf(m, ",port=%u", nfss->port); |
| |
| seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
| seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); |
| seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
| |
| if (version != 4) |
| nfs_show_mountd_options(m, nfss, showdefaults); |
| else |
| nfs_show_nfsv4_options(m, nfss, showdefaults); |
| |
| if (nfss->options & NFS_OPTION_FSCACHE) |
| seq_printf(m, ",fsc"); |
| |
| if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { |
| if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
| seq_printf(m, ",lookupcache=none"); |
| else |
| seq_printf(m, ",lookupcache=pos"); |
| } |
| |
| local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; |
| local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; |
| |
| if (!local_flock && !local_fcntl) |
| seq_printf(m, ",local_lock=none"); |
| else if (local_flock && local_fcntl) |
| seq_printf(m, ",local_lock=all"); |
| else if (local_flock) |
| seq_printf(m, ",local_lock=flock"); |
| else |
| seq_printf(m, ",local_lock=posix"); |
| } |
| |
| /* |
| * Describe the mount options on this VFS mountpoint |
| */ |
| static int nfs_show_options(struct seq_file *m, struct dentry *root) |
| { |
| struct nfs_server *nfss = NFS_SB(root->d_sb); |
| |
| nfs_show_mount_options(m, nfss, 0); |
| |
| rcu_read_lock(); |
| seq_printf(m, ",addr=%s", |
| rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, |
| RPC_DISPLAY_ADDR)); |
| rcu_read_unlock(); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_NFS_V4 |
| #ifdef CONFIG_NFS_V4_1 |
| static void show_sessions(struct seq_file *m, struct nfs_server *server) |
| { |
| if (nfs4_has_session(server->nfs_client)) |
| seq_printf(m, ",sessions"); |
| } |
| #else |
| static void show_sessions(struct seq_file *m, struct nfs_server *server) {} |
| #endif |
| #endif |
| |
| #ifdef CONFIG_NFS_V4_1 |
| static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
| { |
| seq_printf(m, ",pnfs="); |
| if (server->pnfs_curr_ld) |
| seq_printf(m, "%s", server->pnfs_curr_ld->name); |
| else |
| seq_printf(m, "not configured"); |
| } |
| |
| static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
| { |
| if (nfss->nfs_client && nfss->nfs_client->cl_implid) { |
| struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; |
| seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," |
| "date='%llu,%u'", |
| impl_id->name, impl_id->domain, |
| impl_id->date.seconds, impl_id->date.nseconds); |
| } |
| } |
| #else |
| #ifdef CONFIG_NFS_V4 |
| static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
| { |
| } |
| #endif |
| static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
| { |
| } |
| #endif |
| |
| static int nfs_show_devname(struct seq_file *m, struct dentry *root) |
| { |
| char *page = (char *) __get_free_page(GFP_KERNEL); |
| char *devname, *dummy; |
| int err = 0; |
| if (!page) |
| return -ENOMEM; |
| devname = nfs_path(&dummy, root, page, PAGE_SIZE); |
| if (IS_ERR(devname)) |
| err = PTR_ERR(devname); |
| else |
| seq_escape(m, devname, " \t\n\\"); |
| free_page((unsigned long)page); |
| return err; |
| } |
| |
| static int nfs_show_path(struct seq_file *m, struct dentry *dentry) |
| { |
| seq_puts(m, "/"); |
| return 0; |
| } |
| |
| /* |
| * Present statistical information for this VFS mountpoint |
| */ |
| static int nfs_show_stats(struct seq_file *m, struct dentry *root) |
| { |
| int i, cpu; |
| struct nfs_server *nfss = NFS_SB(root->d_sb); |
| struct rpc_auth *auth = nfss->client->cl_auth; |
| struct nfs_iostats totals = { }; |
| |
| seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); |
| |
| /* |
| * Display all mount option settings |
| */ |
| seq_printf(m, "\n\topts:\t"); |
| seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); |
| seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); |
| seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); |
| seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); |
| nfs_show_mount_options(m, nfss, 1); |
| |
| seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); |
| |
| show_implementation_id(m, nfss); |
| |
| seq_printf(m, "\n\tcaps:\t"); |
| seq_printf(m, "caps=0x%x", nfss->caps); |
| seq_printf(m, ",wtmult=%u", nfss->wtmult); |
| seq_printf(m, ",dtsize=%u", nfss->dtsize); |
| seq_printf(m, ",bsize=%u", nfss->bsize); |
| seq_printf(m, ",namlen=%u", nfss->namelen); |
| |
| #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); |
| show_sessions(m, nfss); |
| show_pnfs(m, nfss); |
| } |
| #endif |
| |
| /* |
| * Display security flavor in effect for this mount |
| */ |
| seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
| if (auth->au_flavor) |
| seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
| |
| /* |
| * Display superblock I/O counters |
| */ |
| for_each_possible_cpu(cpu) { |
| struct nfs_iostats *stats; |
| |
| preempt_disable(); |
| stats = per_cpu_ptr(nfss->io_stats, cpu); |
| |
| for (i = 0; i < __NFSIOS_COUNTSMAX; i++) |
| totals.events[i] += stats->events[i]; |
| for (i = 0; i < __NFSIOS_BYTESMAX; i++) |
| totals.bytes[i] += stats->bytes[i]; |
| #ifdef CONFIG_NFS_FSCACHE |
| for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) |
| totals.fscache[i] += stats->fscache[i]; |
| #endif |
| |
| preempt_enable(); |
| } |
| |
| seq_printf(m, "\n\tevents:\t"); |
| for (i = 0; i < __NFSIOS_COUNTSMAX; i++) |
| seq_printf(m, "%lu ", totals.events[i]); |
| seq_printf(m, "\n\tbytes:\t"); |
| for (i = 0; i < __NFSIOS_BYTESMAX; i++) |
| seq_printf(m, "%Lu ", totals.bytes[i]); |
| #ifdef CONFIG_NFS_FSCACHE |
| if (nfss->options & NFS_OPTION_FSCACHE) { |
| seq_printf(m, "\n\tfsc:\t"); |
| for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) |
| seq_printf(m, "%Lu ", totals.bytes[i]); |
| } |
| #endif |
| seq_printf(m, "\n"); |
| |
| rpc_print_iostats(m, nfss->client); |
| |
| return 0; |
| } |
| |
| /* |
| * 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; |
| struct rpc_clnt *rpc; |
| |
| server = NFS_SB(sb); |
| /* -EIO all pending I/O */ |
| rpc = server->client_acl; |
| if (!IS_ERR(rpc)) |
| rpc_killall_tasks(rpc); |
| rpc = server->client; |
| if (!IS_ERR(rpc)) |
| rpc_killall_tasks(rpc); |
| } |
| |
| static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) |
| { |
| struct nfs_parsed_mount_data *data; |
| |
| data = kzalloc(sizeof(*data), GFP_KERNEL); |
| if (data) { |
| data->acregmin = NFS_DEF_ACREGMIN; |
| data->acregmax = NFS_DEF_ACREGMAX; |
| data->acdirmin = NFS_DEF_ACDIRMIN; |
| data->acdirmax = NFS_DEF_ACDIRMAX; |
| data->mount_server.port = NFS_UNSPEC_PORT; |
| data->nfs_server.port = NFS_UNSPEC_PORT; |
| data->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| data->auth_flavors[0] = RPC_AUTH_UNIX; |
| data->auth_flavor_len = 1; |
| data->minorversion = 0; |
| data->need_mount = true; |
| data->net = current->nsproxy->net_ns; |
| security_init_mnt_opts(&data->lsm_opts); |
| } |
| return data; |
| } |
| |
| static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) |
| { |
| if (data) { |
| kfree(data->client_address); |
| kfree(data->mount_server.hostname); |
| kfree(data->nfs_server.export_path); |
| kfree(data->nfs_server.hostname); |
| kfree(data->fscache_uniq); |
| security_free_mnt_opts(&data->lsm_opts); |
| kfree(data); |
| } |
| } |
| |
| /* |
| * Sanity-check a server address provided by the mount command. |
| * |
| * Address family must be initialized, and address must not be |
| * the ANY address for that family. |
| */ |
| static int nfs_verify_server_address(struct sockaddr *addr) |
| { |
| switch (addr->sa_family) { |
| case AF_INET: { |
| struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
| return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
| } |
| case AF_INET6: { |
| struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; |
| return !ipv6_addr_any(sa); |
| } |
| } |
| |
| dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); |
| return 0; |
| } |
| |
| /* |
| * Select between a default port value and a user-specified port value. |
| * If a zero value is set, then autobind will be used. |
| */ |
| static void nfs_set_port(struct sockaddr *sap, int *port, |
| const unsigned short default_port) |
| { |
| if (*port == NFS_UNSPEC_PORT) |
| *port = default_port; |
| |
| rpc_set_port(sap, *port); |
| } |
| |
| /* |
| * Sanity check the NFS transport protocol. |
| * |
| */ |
| static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) |
| { |
| switch (mnt->nfs_server.protocol) { |
| case XPRT_TRANSPORT_UDP: |
| case XPRT_TRANSPORT_TCP: |
| case XPRT_TRANSPORT_RDMA: |
| break; |
| default: |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| } |
| } |
| |
| /* |
| * For text based NFSv2/v3 mounts, the mount protocol transport default |
| * settings should depend upon the specified NFS transport. |
| */ |
| static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) |
| { |
| nfs_validate_transport_protocol(mnt); |
| |
| if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || |
| mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) |
| return; |
| switch (mnt->nfs_server.protocol) { |
| case XPRT_TRANSPORT_UDP: |
| mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
| break; |
| case XPRT_TRANSPORT_TCP: |
| case XPRT_TRANSPORT_RDMA: |
| mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
| } |
| } |
| |
| /* |
| * Parse the value of the 'sec=' option. |
| */ |
| static int nfs_parse_security_flavors(char *value, |
| struct nfs_parsed_mount_data *mnt) |
| { |
| substring_t args[MAX_OPT_ARGS]; |
| |
| dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); |
| |
| switch (match_token(value, nfs_secflavor_tokens, args)) { |
| case Opt_sec_none: |
| mnt->auth_flavors[0] = RPC_AUTH_NULL; |
| break; |
| case Opt_sec_sys: |
| mnt->auth_flavors[0] = RPC_AUTH_UNIX; |
| break; |
| case Opt_sec_krb5: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; |
| break; |
| case Opt_sec_krb5i: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; |
| break; |
| case Opt_sec_krb5p: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; |
| break; |
| case Opt_sec_lkey: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; |
| break; |
| case Opt_sec_lkeyi: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; |
| break; |
| case Opt_sec_lkeyp: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; |
| break; |
| case Opt_sec_spkm: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; |
| break; |
| case Opt_sec_spkmi: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; |
| break; |
| case Opt_sec_spkmp: |
| mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; |
| break; |
| default: |
| return 0; |
| } |
| |
| mnt->flags |= NFS_MOUNT_SECFLAVOUR; |
| mnt->auth_flavor_len = 1; |
| return 1; |
| } |
| |
| static int nfs_parse_version_string(char *string, |
| struct nfs_parsed_mount_data *mnt, |
| substring_t *args) |
| { |
| mnt->flags &= ~NFS_MOUNT_VER3; |
| switch (match_token(string, nfs_vers_tokens, args)) { |
| case Opt_vers_2: |
| mnt->version = 2; |
| break; |
| case Opt_vers_3: |
| mnt->flags |= NFS_MOUNT_VER3; |
| mnt->version = 3; |
| break; |
| case Opt_vers_4: |
| /* Backward compatibility option. In future, |
| * the mount program should always supply |
| * a NFSv4 minor version number. |
| */ |
| mnt->version = 4; |
| break; |
| case Opt_vers_4_0: |
| mnt->version = 4; |
| mnt->minorversion = 0; |
| break; |
| case Opt_vers_4_1: |
| mnt->version = 4; |
| mnt->minorversion = 1; |
| break; |
| default: |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int nfs_get_option_str(substring_t args[], char **option) |
| { |
| kfree(*option); |
| *option = match_strdup(args); |
| return !option; |
| } |
| |
| static int nfs_get_option_ul(substring_t args[], unsigned long *option) |
| { |
| int rc; |
| char *string; |
| |
| string = match_strdup(args); |
| if (string == NULL) |
| return -ENOMEM; |
| rc = strict_strtoul(string, 10, option); |
| kfree(string); |
| |
| return rc; |
| } |
| |
| /* |
| * Error-check and convert a string of mount options from user space into |
| * a data structure. The whole mount string is processed; bad options are |
| * skipped as they are encountered. If there were no errors, return 1; |
| * otherwise return 0 (zero). |
| */ |
| static int nfs_parse_mount_options(char *raw, |
| struct nfs_parsed_mount_data *mnt) |
| { |
| char *p, *string, *secdata; |
| int rc, sloppy = 0, invalid_option = 0; |
| unsigned short protofamily = AF_UNSPEC; |
| unsigned short mountfamily = AF_UNSPEC; |
| |
| if (!raw) { |
| dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); |
| return 1; |
| } |
| dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); |
| |
| secdata = alloc_secdata(); |
| if (!secdata) |
| goto out_nomem; |
| |
| rc = security_sb_copy_data(raw, secdata); |
| if (rc) |
| goto out_security_failure; |
| |
| rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); |
| if (rc) |
| goto out_security_failure; |
| |
| free_secdata(secdata); |
| |
| while ((p = strsep(&raw, ",")) != NULL) { |
| substring_t args[MAX_OPT_ARGS]; |
| unsigned long option; |
| int token; |
| |
| if (!*p) |
| continue; |
| |
| dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); |
| |
| token = match_token(p, nfs_mount_option_tokens, args); |
| switch (token) { |
| |
| /* |
| * boolean options: foo/nofoo |
| */ |
| case Opt_soft: |
| mnt->flags |= NFS_MOUNT_SOFT; |
| break; |
| case Opt_hard: |
| mnt->flags &= ~NFS_MOUNT_SOFT; |
| break; |
| case Opt_posix: |
| mnt->flags |= NFS_MOUNT_POSIX; |
| break; |
| case Opt_noposix: |
| mnt->flags &= ~NFS_MOUNT_POSIX; |
| break; |
| case Opt_cto: |
| mnt->flags &= ~NFS_MOUNT_NOCTO; |
| break; |
| case Opt_nocto: |
| mnt->flags |= NFS_MOUNT_NOCTO; |
| break; |
| case Opt_ac: |
| mnt->flags &= ~NFS_MOUNT_NOAC; |
| break; |
| case Opt_noac: |
| mnt->flags |= NFS_MOUNT_NOAC; |
| break; |
| case Opt_lock: |
| mnt->flags &= ~NFS_MOUNT_NONLM; |
| mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
| NFS_MOUNT_LOCAL_FCNTL); |
| break; |
| case Opt_nolock: |
| mnt->flags |= NFS_MOUNT_NONLM; |
| mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
| NFS_MOUNT_LOCAL_FCNTL); |
| break; |
| case Opt_udp: |
| mnt->flags &= ~NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
| break; |
| case Opt_tcp: |
| mnt->flags |= NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| break; |
| case Opt_rdma: |
| mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; |
| xprt_load_transport(p); |
| break; |
| case Opt_acl: |
| mnt->flags &= ~NFS_MOUNT_NOACL; |
| break; |
| case Opt_noacl: |
| mnt->flags |= NFS_MOUNT_NOACL; |
| break; |
| case Opt_rdirplus: |
| mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; |
| break; |
| case Opt_nordirplus: |
| mnt->flags |= NFS_MOUNT_NORDIRPLUS; |
| break; |
| case Opt_sharecache: |
| mnt->flags &= ~NFS_MOUNT_UNSHARED; |
| break; |
| case Opt_nosharecache: |
| mnt->flags |= NFS_MOUNT_UNSHARED; |
| break; |
| case Opt_resvport: |
| mnt->flags &= ~NFS_MOUNT_NORESVPORT; |
| break; |
| case Opt_noresvport: |
| mnt->flags |= NFS_MOUNT_NORESVPORT; |
| break; |
| case Opt_fscache: |
| mnt->options |= NFS_OPTION_FSCACHE; |
| kfree(mnt->fscache_uniq); |
| mnt->fscache_uniq = NULL; |
| break; |
| case Opt_nofscache: |
| mnt->options &= ~NFS_OPTION_FSCACHE; |
| kfree(mnt->fscache_uniq); |
| mnt->fscache_uniq = NULL; |
| break; |
| |
| /* |
| * options that take numeric values |
| */ |
| case Opt_port: |
| if (nfs_get_option_ul(args, &option) || |
| option > USHRT_MAX) |
| goto out_invalid_value; |
| mnt->nfs_server.port = option; |
| break; |
| case Opt_rsize: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->rsize = option; |
| break; |
| case Opt_wsize: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->wsize = option; |
| break; |
| case Opt_bsize: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->bsize = option; |
| break; |
| case Opt_timeo: |
| if (nfs_get_option_ul(args, &option) || option == 0) |
| goto out_invalid_value; |
| mnt->timeo = option; |
| break; |
| case Opt_retrans: |
| if (nfs_get_option_ul(args, &option) || option == 0) |
| goto out_invalid_value; |
| mnt->retrans = option; |
| break; |
| case Opt_acregmin: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->acregmin = option; |
| break; |
| case Opt_acregmax: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->acregmax = option; |
| break; |
| case Opt_acdirmin: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->acdirmin = option; |
| break; |
| case Opt_acdirmax: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->acdirmax = option; |
| break; |
| case Opt_actimeo: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->acregmin = mnt->acregmax = |
| mnt->acdirmin = mnt->acdirmax = option; |
| break; |
| case Opt_namelen: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| mnt->namlen = option; |
| break; |
| case Opt_mountport: |
| if (nfs_get_option_ul(args, &option) || |
| option > USHRT_MAX) |
| goto out_invalid_value; |
| mnt->mount_server.port = option; |
| break; |
| case Opt_mountvers: |
| if (nfs_get_option_ul(args, &option) || |
| option < NFS_MNT_VERSION || |
| option > NFS_MNT3_VERSION) |
| goto out_invalid_value; |
| mnt->mount_server.version = option; |
| break; |
| case Opt_minorversion: |
| if (nfs_get_option_ul(args, &option)) |
| goto out_invalid_value; |
| if (option > NFS4_MAX_MINOR_VERSION) |
| goto out_invalid_value; |
| mnt->minorversion = option; |
| break; |
| |
| /* |
| * options that take text values |
| */ |
| case Opt_nfsvers: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| rc = nfs_parse_version_string(string, mnt, args); |
| kfree(string); |
| if (!rc) |
| goto out_invalid_value; |
| break; |
| case Opt_sec: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| rc = nfs_parse_security_flavors(string, mnt); |
| kfree(string); |
| if (!rc) { |
| dfprintk(MOUNT, "NFS: unrecognized " |
| "security flavor\n"); |
| return 0; |
| } |
| break; |
| case Opt_proto: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| token = match_token(string, |
| nfs_xprt_protocol_tokens, args); |
| |
| protofamily = AF_INET; |
| switch (token) { |
| case Opt_xprt_udp6: |
| protofamily = AF_INET6; |
| case Opt_xprt_udp: |
| mnt->flags &= ~NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
| break; |
| case Opt_xprt_tcp6: |
| protofamily = AF_INET6; |
| case Opt_xprt_tcp: |
| mnt->flags |= NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
| break; |
| case Opt_xprt_rdma: |
| /* vector side protocols to TCP */ |
| mnt->flags |= NFS_MOUNT_TCP; |
| mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; |
| xprt_load_transport(string); |
| break; |
| default: |
| dfprintk(MOUNT, "NFS: unrecognized " |
| "transport protocol\n"); |
| kfree(string); |
| return 0; |
| } |
| kfree(string); |
| break; |
| case Opt_mountproto: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| token = match_token(string, |
| nfs_xprt_protocol_tokens, args); |
| kfree(string); |
| |
| mountfamily = AF_INET; |
| switch (token) { |
| case Opt_xprt_udp6: |
| mountfamily = AF_INET6; |
| case Opt_xprt_udp: |
| mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
| break; |
| case Opt_xprt_tcp6: |
| mountfamily = AF_INET6; |
| case Opt_xprt_tcp: |
| mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
| break; |
| case Opt_xprt_rdma: /* not used for side protocols */ |
| default: |
| dfprintk(MOUNT, "NFS: unrecognized " |
| "transport protocol\n"); |
| return 0; |
| } |
| break; |
| case Opt_addr: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| mnt->nfs_server.addrlen = |
| rpc_pton(mnt->net, string, strlen(string), |
| (struct sockaddr *) |
| &mnt->nfs_server.address, |
| sizeof(mnt->nfs_server.address)); |
| kfree(string); |
| if (mnt->nfs_server.addrlen == 0) |
| goto out_invalid_address; |
| break; |
| case Opt_clientaddr: |
| if (nfs_get_option_str(args, &mnt->client_address)) |
| goto out_nomem; |
| break; |
| case Opt_mounthost: |
| if (nfs_get_option_str(args, |
| &mnt->mount_server.hostname)) |
| goto out_nomem; |
| break; |
| case Opt_mountaddr: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| mnt->mount_server.addrlen = |
| rpc_pton(mnt->net, string, strlen(string), |
| (struct sockaddr *) |
| &mnt->mount_server.address, |
| sizeof(mnt->mount_server.address)); |
| kfree(string); |
| if (mnt->mount_server.addrlen == 0) |
| goto out_invalid_address; |
| break; |
| case Opt_lookupcache: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| token = match_token(string, |
| nfs_lookupcache_tokens, args); |
| kfree(string); |
| switch (token) { |
| case Opt_lookupcache_all: |
| mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); |
| break; |
| case Opt_lookupcache_positive: |
| mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; |
| mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; |
| break; |
| case Opt_lookupcache_none: |
| mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; |
| break; |
| default: |
| dfprintk(MOUNT, "NFS: invalid " |
| "lookupcache argument\n"); |
| return 0; |
| }; |
| break; |
| case Opt_fscache_uniq: |
| if (nfs_get_option_str(args, &mnt->fscache_uniq)) |
| goto out_nomem; |
| mnt->options |= NFS_OPTION_FSCACHE; |
| break; |
| case Opt_local_lock: |
| string = match_strdup(args); |
| if (string == NULL) |
| goto out_nomem; |
| token = match_token(string, nfs_local_lock_tokens, |
| args); |
| kfree(string); |
| switch (token) { |
| case Opt_local_lock_all: |
| mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
| NFS_MOUNT_LOCAL_FCNTL); |
| break; |
| case Opt_local_lock_flock: |
| mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; |
| break; |
| case Opt_local_lock_posix: |
| mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; |
| break; |
| case Opt_local_lock_none: |
| mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
| NFS_MOUNT_LOCAL_FCNTL); |
| break; |
| default: |
| dfprintk(MOUNT, "NFS: invalid " |
| "local_lock argument\n"); |
| return 0; |
| }; |
| break; |
| |
| /* |
| * Special options |
| */ |
| case Opt_sloppy: |
| sloppy = 1; |
| dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); |
| break; |
| case Opt_userspace: |
| case Opt_deprecated: |
| dfprintk(MOUNT, "NFS: ignoring mount option " |
| "'%s'\n", p); |
| break; |
| |
| default: |
| invalid_option = 1; |
| dfprintk(MOUNT, "NFS: unrecognized mount option " |
| "'%s'\n", p); |
| } |
| } |
| |
| if (!sloppy && invalid_option) |
| return 0; |
| |
| if (mnt->minorversion && mnt->version != 4) |
| goto out_minorversion_mismatch; |
| |
| /* |
| * verify that any proto=/mountproto= options match the address |
| * familiies in the addr=/mountaddr= options. |
| */ |
| if (protofamily != AF_UNSPEC && |
| protofamily != mnt->nfs_server.address.ss_family) |
| goto out_proto_mismatch; |
| |
| if (mountfamily != AF_UNSPEC) { |
| if (mnt->mount_server.addrlen) { |
| if (mountfamily != mnt->mount_server.address.ss_family) |
| goto out_mountproto_mismatch; |
| } else { |
| if (mountfamily != mnt->nfs_server.address.ss_family) |
| goto out_mountproto_mismatch; |
| } |
| } |
| |
| return 1; |
| |
| out_mountproto_mismatch: |
| printk(KERN_INFO "NFS: mount server address does not match mountproto= " |
| "option\n"); |
| return 0; |
| out_proto_mismatch: |
| printk(KERN_INFO "NFS: server address does not match proto= option\n"); |
| return 0; |
| out_invalid_address: |
| printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); |
| return 0; |
| out_invalid_value: |
| printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); |
| return 0; |
| out_minorversion_mismatch: |
| printk(KERN_INFO "NFS: mount option vers=%u does not support " |
| "minorversion=%u\n", mnt->version, mnt->minorversion); |
| return 0; |
| out_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; |
| } |
| |
| /* |
| * Match the requested auth flavors with the list returned by |
| * the server. Returns zero and sets the mount's authentication |
| * flavor on success; returns -EACCES if server does not support |
| * the requested flavor. |
| */ |
| static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, |
| struct nfs_mount_request *request) |
| { |
| unsigned int i, j, server_authlist_len = *(request->auth_flav_len); |
| |
| /* |
| * Certain releases of Linux's mountd return an empty |
| * flavor list. To prevent behavioral regression with |
| * these servers (ie. rejecting mounts that used to |
| * succeed), revert to pre-2.6.32 behavior (no checking) |
| * if the returned flavor list is empty. |
| */ |
| if (server_authlist_len == 0) |
| return 0; |
| |
| /* |
| * We avoid sophisticated negotiating here, as there are |
| * plenty of cases where we can get it wrong, providing |
| * either too little or too much security. |
| * |
| * RFC 2623, section 2.7 suggests we SHOULD prefer the |
| * flavor listed first. However, some servers list |
| * AUTH_NULL first. Our caller plants AUTH_SYS, the |
| * preferred default, in args->auth_flavors[0] if user |
| * didn't specify sec= mount option. |
| */ |
| for (i = 0; i < args->auth_flavor_len; i++) |
| for (j = 0; j < server_authlist_len; j++) |
| if (args->auth_flavors[i] == request->auth_flavs[j]) { |
| dfprintk(MOUNT, "NFS: using auth flavor %d\n", |
| request->auth_flavs[j]); |
| args->auth_flavors[0] = request->auth_flavs[j]; |
| return 0; |
| } |
| |
| dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); |
| nfs_umount(request); |
| return -EACCES; |
| } |
| |
| /* |
| * Use the remote server's MOUNT service to request the NFS file handle |
| * corresponding to the provided path. |
| */ |
| static int nfs_request_mount(struct nfs_parsed_mount_data *args, |
| struct nfs_fh *root_fh) |
| { |
| rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; |
| unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); |
| struct nfs_mount_request request = { |
| .sap = (struct sockaddr *) |
| &args->mount_server.address, |
| .dirpath = args->nfs_server.export_path, |
| .protocol = args->mount_server.protocol, |
| .fh = root_fh, |
| .noresvport = args->flags & NFS_MOUNT_NORESVPORT, |
| .auth_flav_len = &server_authlist_len, |
| .auth_flavs = server_authlist, |
| .net = args->net, |
| }; |
| int status; |
| |
| if (args->mount_server.version == 0) { |
| switch (args->version) { |
| default: |
| args->mount_server.version = NFS_MNT3_VERSION; |
| break; |
| case 2: |
| args->mount_server.version = NFS_MNT_VERSION; |
| } |
| } |
| request.version = args->mount_server.version; |
| |
| if (args->mount_server.hostname) |
| request.hostname = args->mount_server.hostname; |
| else |
| request.hostname = args->nfs_server.hostname; |
| |
| /* |
| * Construct the mount server's address. |
| */ |
| if (args->mount_server.address.ss_family == AF_UNSPEC) { |
| memcpy(request.sap, &args->nfs_server.address, |
| args->nfs_server.addrlen); |
| args->mount_server.addrlen = args->nfs_server.addrlen; |
| } |
| request.salen = args->mount_server.addrlen; |
| nfs_set_port(request.sap, &args->mount_server.port, 0); |
| |
| /* |
| * Now ask the mount server to map our export path |
| * to a file handle. |
| */ |
| status = nfs_mount(&request); |
| if (status != 0) { |
| dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", |
| request.hostname, status); |
| return status; |
| } |
| |
| /* |
| * MNTv1 (NFSv2) does not support auth flavor negotiation. |
| */ |
| if (args->mount_server.version != NFS_MNT3_VERSION) |
| return 0; |
| return nfs_walk_authlist(args, &request); |
| } |
| |
| static struct dentry *nfs_try_mount(int flags, const char *dev_name, |
| struct nfs_mount_info *mount_info) |
| { |
| int status; |
| struct nfs_server *server; |
| |
| if (mount_info->parsed->need_mount) { |
| status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); |
| if (status) |
| return ERR_PTR(status); |
| } |
| |
| /* Get a volume representation */ |
| server = nfs_create_server(mount_info->parsed, mount_info->mntfh); |
| if (IS_ERR(server)) |
| return ERR_CAST(server); |
| |
| return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info); |
| } |
| |
| /* |
| * Split "dev_name" into "hostname:export_path". |
| * |
| * The leftmost colon demarks the split between the server's hostname |
| * and the export path. If the hostname starts with a left square |
| * bracket, then it may contain colons. |
| * |
| * Note: caller frees hostname and export path, even on error. |
| */ |
| static int nfs_parse_devname(const char *dev_name, |
| char **hostname, size_t maxnamlen, |
| char **export_path, size_t maxpathlen) |
| { |
| size_t len; |
| char *end; |
| |
| /* Is the host name protected with square brakcets? */ |
| if (*dev_name == '[') { |
| end = strchr(++dev_name, ']'); |
| if (end == NULL || end[1] != ':') |
| goto out_bad_devname; |
| |
| len = end - dev_name; |
| end++; |
| } else { |
| char *comma; |
| |
| end = strchr(dev_name, ':'); |
| if (end == NULL) |
| goto out_bad_devname; |
| len = end - dev_name; |
| |
| /* kill possible hostname list: not supported */ |
| comma = strchr(dev_name, ','); |
| if (comma != NULL && comma < end) |
| *comma = 0; |
| } |
| |
| if (len > maxnamlen) |
| goto out_hostname; |
| |
| /* N.B. caller will free nfs_server.hostname in all cases */ |
| *hostname = kstrndup(dev_name, len, GFP_KERNEL); |
| if (*hostname == NULL) |
| goto out_nomem; |
| len = strlen(++end); |
| if (len > maxpathlen) |
| goto out_path; |
| *export_path = kstrndup(end, len, GFP_KERNEL); |
| if (!*export_path) |
| goto out_nomem; |
| |
| dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); |
| return 0; |
| |
| out_bad_devname: |
| dfprintk(MOUNT, "NFS: device name not in host:path format\n"); |
| return -EINVAL; |
| |
| out_nomem: |
| dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); |
| return -ENOMEM; |
| |
| out_hostname: |
| dfprintk(MOUNT, "NFS: server hostname too long\n"); |
| return -ENAMETOOLONG; |
| |
| out_path: |
| dfprintk(MOUNT, "NFS: export pathname too long\n"); |
| return -ENAMETOOLONG; |
| } |
| |
| /* |
| * Validate the NFS2/NFS3 mount data |
| * - fills in the mount root filehandle |
| * |
| * For option strings, user space handles the following behaviors: |
| * |
| * + DNS: mapping server host name to IP address ("addr=" option) |
| * |
| * + failure mode: how to behave if a mount request can't be handled |
| * immediately ("fg/bg" option) |
| * |
| * + retry: how often to retry a mount request ("retry=" option) |
| * |
| * + breaking back: trying proto=udp after proto=tcp, v2 after v3, |
| * mountproto=tcp after mountproto=udp, and so on |
| */ |
| static int nfs23_validate_mount_data(void *options, |
| struct nfs_parsed_mount_data *args, |
| struct nfs_fh *mntfh, |
| const char *dev_name) |
| { |
| struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
| struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
| |
| if (data == NULL) |
| goto out_no_data; |
| |
| args->version = NFS_DEFAULT_VERSION; |
| switch (data->version) { |
| case 1: |
| data->namlen = 0; |
| case 2: |
| data->bsize = 0; |
| case 3: |
| if (data->flags & NFS_MOUNT_VER3) |
| goto out_no_v3; |
| data->root.size = NFS2_FHSIZE; |
| memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); |
| case 4: |
| if (data->flags & NFS_MOUNT_SECFLAVOUR) |
| goto out_no_sec; |
| case 5: |
| memset(data->context, 0, sizeof(data->context)); |
| case 6: |
| if (data->flags & NFS_MOUNT_VER3) { |
| if (data->root.size > NFS3_FHSIZE || data->root.size == 0) |
| goto out_invalid_fh; |
| mntfh->size = data->root.size; |
| args->version = 3; |
| } else { |
| mntfh->size = NFS2_FHSIZE; |
| args->version = 2; |
| } |
| |
| |
| memcpy(mntfh->data, data->root.data, mntfh->size); |
| if (mntfh->size < sizeof(mntfh->data)) |
| memset(mntfh->data + mntfh->size, 0, |
| sizeof(mntfh->data) - mntfh->size); |
| |
| /* |
| * Translate to nfs_parsed_mount_data, which nfs_fill_super |
| * can deal with. |
| */ |
| args->flags = data->flags & NFS_MOUNT_FLAGMASK; |
| args->flags |= NFS_MOUNT_LEGACY_INTERFACE; |
| args->rsize = data->rsize; |
| args->wsize = data->wsize; |
| args->timeo = data->timeo; |
| args->retrans = data->retrans; |
| args->acregmin = data->acregmin; |
| args->acregmax = data->acregmax; |
| args->acdirmin = data->acdirmin; |
| args->acdirmax = data->acdirmax; |
| args->need_mount = false; |
| |
| memcpy(sap, &data->addr, sizeof(data->addr)); |
| args->nfs_server.addrlen = sizeof(data->addr); |
| if (!nfs_verify_server_address(sap)) |
| goto out_no_address; |
| |
| if (!(data->flags & NFS_MOUNT_TCP)) |
| args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
| /* N.B. caller will free nfs_server.hostname in all cases */ |
| args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); |
| args->namlen = data->namlen; |
| args->bsize = data->bsize; |
| |
| if (data->flags & NFS_MOUNT_SECFLAVOUR) |
| args->auth_flavors[0] = data->pseudoflavor; |
| if (!args->nfs_server.hostname) |
| goto out_nomem; |
| |
| if (!(data->flags & NFS_MOUNT_NONLM)) |
| args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| |
| NFS_MOUNT_LOCAL_FCNTL); |
| else |
| args->flags |= (NFS_MOUNT_LOCAL_FLOCK| |
| NFS_MOUNT_LOCAL_FCNTL); |
| /* |
| * The legacy version 6 binary mount data from userspace has a |
| * field used only to transport selinux information into the |
| * the kernel. To continue to support that functionality we |
| * have a touch of selinux knowledge here in the NFS code. The |
| * userspace code converted context=blah to just blah so we are |
| * converting back to the full string selinux understands. |
| */ |
| if (data->context[0]){ |
| #ifdef CONFIG_SECURITY_SELINUX |
| int rc; |
| char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); |
| if (!opts_str) |
| return -ENOMEM; |
| strcpy(opts_str, "context="); |
| data->context[NFS_MAX_CONTEXT_LEN] = '\0'; |
| strcat(opts_str, &data->context[0]); |
| rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); |
| kfree(opts_str); |
| if (rc) |
| return rc; |
| #else |
| return -EINVAL; |
| #endif |
| } |
| |
| break; |
| default: |
| return NFS_TEXT_DATA; |
| } |
| |
| #ifndef CONFIG_NFS_V3 |
| if (args->version == 3) |
| 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; |
| } |
| |
| #ifdef CONFIG_NFS_V4 |
| static int nfs_validate_mount_data(struct file_system_type *fs_type, |
| void *options, |
| struct nfs_parsed_mount_data *args, |
| struct nfs_fh *mntfh, |
| const char *dev_name) |
| { |
| if (fs_type == &nfs_fs_type) |
| return nfs23_validate_mount_data(options, args, mntfh, dev_name); |
| return nfs4_validate_mount_data(options, args, dev_name); |
| } |
| #else |
| static int nfs_validate_mount_data(struct file_system_type *fs_type, |
| void *options, |
| struct nfs_parsed_mount_data *args, |
| struct nfs_fh *mntfh, |
| const char *dev_name) |
| { |
| return nfs23_validate_mount_data(options, args, mntfh, dev_name); |
| } |
| #endif |
| |
| static int nfs_validate_text_mount_data(void *options, |
| struct nfs_parsed_mount_data *args, |
| const char *dev_name) |
| { |
| int port = 0; |
| int max_namelen = PAGE_SIZE; |
| int max_pathlen = NFS_MAXPATHLEN; |
| struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
| |
| if (nfs_parse_mount_options((char *)options, args) == 0) |
| return -EINVAL; |
| |
| if (!nfs_verify_server_address(sap)) |
| goto out_no_address; |
| |
| if (args->version == 4) { |
| #ifdef CONFIG_NFS_V4 |
| port = NFS_PORT; |
| max_namelen = NFS4_MAXNAMLEN; |
| max_pathlen = NFS4_MAXPATHLEN; |
| nfs_validate_transport_protocol(args); |
| nfs4_validate_mount_flags(args); |
| #else |
| goto out_v4_not_compiled; |
| #endif /* CONFIG_NFS_V4 */ |
| } else |
| nfs_set_mount_transport_protocol(args); |
| |
| nfs_set_port(sap, &args->nfs_server.port, port); |
| |
| if (args->auth_flavor_len > 1) |
| goto out_bad_auth; |
| |
| return nfs_parse_devname(dev_name, |
| &args->nfs_server.hostname, |
| max_namelen, |
| &args->nfs_server.export_path, |
| max_pathlen); |
| |
| #ifndef CONFIG_NFS_V4 |
| out_v4_not_compiled: |
| dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); |
| return -EPROTONOSUPPORT; |
| #endif /* !CONFIG_NFS_V4 */ |
| |
| out_no_address: |
| dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); |
| return -EINVAL; |
| |
| out_bad_auth: |
| dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\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.port != nfss->port || |
| data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
| !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, |
| (struct sockaddr *)&nfss->nfs_client->cl_addr)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| 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.port = nfss->port; |
| 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; |
| |
| /* |
| * noac is a special case. It implies -o sync, but that's not |
| * necessarily reflected in the mtab options. do_remount_sb |
| * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the |
| * remount options, so we have to explicitly reset it. |
| */ |
| if (data->flags & NFS_MOUNT_NOAC) |
| *flags |= MS_SYNCHRONOUS; |
| |
| /* compare new mount options with old ones */ |
| error = nfs_compare_remount_data(nfss, data); |
| out: |
| kfree(data); |
| return error; |
| } |
| |
| /* |
| * 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), |
| "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
| |
| if (sb->s_blocksize == 0) |
| sb->s_blocksize = nfs_block_bits(server->wsize, |
| &sb->s_blocksize_bits); |
| |
| sb->s_bdi = &server->backing_dev_info; |
| |
| nfs_super_set_maxbytes(sb, server->maxfilesize); |
| } |
| |
| /* |
| * Finish setting up an NFS2/3 superblock |
| */ |
| static void nfs_fill_super(struct super_block *sb, |
| struct nfs_mount_info *mount_info) |
| { |
| struct nfs_parsed_mount_data *data = mount_info->parsed; |
| struct nfs_server *server = NFS_SB(sb); |
| |
| sb->s_blocksize_bits = 0; |
| sb->s_blocksize = 0; |
| if (data->bsize) |
| sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); |
| |
| if (server->nfs_client->rpc_ops->version == 3) { |
| /* 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, |
| struct nfs_mount_info *mount_info) |
| { |
| const struct super_block *old_sb = mount_info->cloned->sb; |
| struct nfs_server *server = NFS_SB(sb); |
| |
| sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
| sb->s_blocksize = old_sb->s_blocksize; |
| sb->s_maxbytes = old_sb->s_maxbytes; |
| |
| if (server->nfs_client->rpc_ops->version == 3) { |
| /* 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); |
| } |
| |
| 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; |
| s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; |
| ret = set_anon_super(s, server); |
| if (ret == 0) |
| server->s_dev = s->s_dev; |
| return ret; |
| } |
| |
| static int nfs_compare_super_address(struct nfs_server *server1, |
| struct nfs_server *server2) |
| { |
| struct sockaddr *sap1, *sap2; |
| |
| sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; |
| sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; |
| |
| if (sap1->sa_family != sap2->sa_family) |
| return 0; |
| |
| switch (sap1->sa_family) { |
| case AF_INET: { |
| struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; |
| struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; |
| if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) |
| return 0; |
| if (sin1->sin_port != sin2->sin_port) |
| return 0; |
| break; |
| } |
| case AF_INET6: { |
| struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; |
| struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; |
| if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) |
| return 0; |
| if (sin1->sin6_port != sin2->sin6_port) |
| return 0; |
| break; |
| } |
| default: |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int nfs_compare_super(struct super_block *sb, void *data) |
| { |
| struct nfs_sb_mountdata *sb_mntdata = data; |
| struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); |
| int mntflags = sb_mntdata->mntflags; |
| |
| if (!nfs_compare_super_address(old, server)) |
| return 0; |
| /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ |
| if (old->flags & NFS_MOUNT_UNSHARED) |
| return 0; |
| if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) |
| return 0; |
| return nfs_compare_mount_options(sb, server, mntflags); |
| } |
| |
| #ifdef CONFIG_NFS_FSCACHE |
| static void nfs_get_cache_cookie(struct super_block *sb, |
| struct nfs_parsed_mount_data *parsed, |
| struct nfs_clone_mount *cloned) |
| { |
| char *uniq = NULL; |
| int ulen = 0; |
| |
| if (parsed && parsed->fscache_uniq) { |
| uniq = parsed->fscache_uniq; |
| ulen = strlen(parsed->fscache_uniq); |
| } else if (cloned) { |
| struct nfs_server *mnt_s = NFS_SB(cloned->sb); |
| if (mnt_s->fscache_key) { |
| uniq = mnt_s->fscache_key->key.uniquifier; |
| ulen = mnt_s->fscache_key->key.uniq_len; |
| }; |
| } |
| |
| nfs_fscache_get_super_cookie(sb, uniq, ulen); |
| } |
| #else |
| static void nfs_get_cache_cookie(struct super_block *sb, |
| struct nfs_parsed_mount_data *parsed, |
| struct nfs_clone_mount *cloned) |
| { |
| } |
| #endif |
| |
| static int nfs_bdi_register(struct nfs_server *server) |
| { |
| return bdi_register_dev(&server->backing_dev_info, server->s_dev); |
| } |
| |
| static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, |
| struct nfs_mount_info *mount_info) |
| { |
| return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); |
| } |
| |
| static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, |
| struct nfs_mount_info *mount_info) |
| { |
| /* clone any lsm security options from the parent to the new sb */ |
| security_sb_clone_mnt_opts(mount_info->cloned->sb, s); |
| if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) |
| return -ESTALE; |
| return 0; |
| } |
| |
| static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type, |
| struct nfs_server *server, |
| int flags, const char *dev_name, |
| struct nfs_mount_info *mount_info) |
| { |
| struct super_block *s; |
| struct dentry *mntroot = ERR_PTR(-ENOMEM); |
| int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
| struct nfs_sb_mountdata sb_mntdata = { |
| .mntflags = flags, |
| .server = server, |
| }; |
| int error; |
| |
| if (server->flags & NFS_MOUNT_UNSHARED) |
| compare_super = NULL; |
| |
| /* -o noac implies -o sync */ |
| if (server->flags & NFS_MOUNT_NOAC) |
| sb_mntdata.mntflags |= MS_SYNCHRONOUS; |
| |
| /* 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)) { |
| mntroot = ERR_CAST(s); |
| goto out_err_nosb; |
| } |
| |
| if (s->s_fs_info != server) { |
| nfs_free_server(server); |
| server = NULL; |
| } else { |
| error = nfs_bdi_register(server); |
| if (error) { |
| mntroot = ERR_PTR(error); |
| goto error_splat_bdi; |
| } |
| } |
| |
| if (!s->s_root) { |
| /* initial superblock/root creation */ |
| mount_info->fill_super(s, mount_info); |
| nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); |
| } |
| |
| mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); |
| if (IS_ERR(mntroot)) |
| goto error_splat_super; |
| |
| error = mount_info->set_security(s, mntroot, mount_info); |
| if (error) |
| goto error_splat_root; |
| |
| s->s_flags |= MS_ACTIVE; |
| |
| out: |
| return mntroot; |
| |
| out_err_nosb: |
| nfs_free_server(server); |
| goto out; |
| |
| error_splat_root: |
| dput(mntroot); |
| mntroot = ERR_PTR(error); |
| error_splat_super: |
| if (server && !s->s_root) |
| bdi_unregister(&server->backing_dev_info); |
| error_splat_bdi: |
| deactivate_locked_super(s); |
| goto out; |
| } |
| |
| static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data) |
| { |
| struct nfs_mount_info mount_info = { |
| .fill_super = nfs_fill_super, |
| .set_security = nfs_set_sb_security, |
| }; |
| struct dentry *mntroot = ERR_PTR(-ENOMEM); |
| int error; |
| |
| mount_info.parsed = nfs_alloc_parsed_mount_data(); |
| mount_info.mntfh = nfs_alloc_fhandle(); |
| if (mount_info.parsed == NULL || mount_info.mntfh == NULL) |
| goto out; |
| |
| /* Validate the mount data */ |
| error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); |
| if (error == NFS_TEXT_DATA) |
| error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); |
| if (error < 0) { |
| mntroot = ERR_PTR(error); |
| goto out; |
| } |
| |
| #ifdef CONFIG_NFS_V4 |
| if (mount_info.parsed->version == 4) |
| mntroot = nfs4_try_mount(flags, dev_name, &mount_info); |
| else |
| #endif /* CONFIG_NFS_V4 */ |
| mntroot = nfs_try_mount(flags, dev_name, &mount_info); |
| |
| out: |
| nfs_free_parsed_mount_data(mount_info.parsed); |
| nfs_free_fhandle(mount_info.mntfh); |
| return mntroot; |
| } |
| |
| /* |
| * Ensure that we unregister the bdi before kill_anon_super |
| * releases the device name |
| */ |
| static void nfs_put_super(struct super_block *s) |
| { |
| struct nfs_server *server = NFS_SB(s); |
| |
| bdi_unregister(&server->backing_dev_info); |
| } |
| |
| /* |
| * Destroy an NFS2/3 superblock |
| */ |
| static void nfs_kill_super(struct super_block *s) |
| { |
| struct nfs_server *server = NFS_SB(s); |
| |
| kill_anon_super(s); |
| nfs_fscache_release_super_cookie(s); |
| nfs_free_server(server); |
| } |
| |
| /* |
| * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) |
| */ |
| static struct dentry * |
| nfs_xdev_mount_common(struct file_system_type *fs_type, int flags, |
| const char *dev_name, struct nfs_mount_info *mount_info) |
| { |
| struct nfs_clone_mount *data = mount_info->cloned; |
| struct nfs_server *server; |
| struct dentry *mntroot = ERR_PTR(-ENOMEM); |
| int error; |
| |
| dprintk("--> nfs_xdev_mount_common()\n"); |
| |
| mount_info->mntfh = data->fh; |
| |
| /* create a new volume representation */ |
| server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); |
| if (IS_ERR(server)) { |
| error = PTR_ERR(server); |
| goto out_err; |
| } |
| |
| mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info); |
| dprintk("<-- nfs_xdev_mount_common() = 0\n"); |
| out: |
| return mntroot; |
| |
| out_err: |
| dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); |
| goto out; |
| } |
| |
| /* |
| * Clone an NFS2/3 server record on xdev traversal (FSID-change) |
| */ |
| static struct dentry * |
| nfs_xdev_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *raw_data) |
| { |
| struct nfs_mount_info mount_info = { |
| .fill_super = nfs_clone_super, |
| .set_security = nfs_clone_sb_security, |
| .cloned = raw_data, |
| }; |
| return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info); |
| } |
| |
| #ifdef CONFIG_NFS_V4 |
| |
| /* |
| * Finish setting up a cloned NFS4 superblock |
| */ |
| static void nfs4_clone_super(struct super_block *sb, |
| struct nfs_mount_info *mount_info) |
| { |
| const struct super_block *old_sb = mount_info->cloned->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; |
| /* |
| * The VFS shouldn't apply the umask to mode bits. We will do |
| * so ourselves when necessary. |
| */ |
| sb->s_flags |= MS_POSIXACL; |
| sb->s_xattr = old_sb->s_xattr; |
| nfs_initialise_sb(sb); |
| } |
| |
| /* |
| * Set up an NFS4 superblock |
| */ |
| static void nfs4_fill_super(struct super_block *sb, |
| struct nfs_mount_info *mount_info) |
| { |
| sb->s_time_gran = 1; |
| sb->s_op = &nfs4_sops; |
| /* |
| * The VFS shouldn't apply the umask to mode bits. We will do |
| * so ourselves when necessary. |
| */ |
| sb->s_flags |= MS_POSIXACL; |
| sb->s_xattr = nfs4_xattr_handlers; |
| nfs_initialise_sb(sb); |
| } |
| |
| static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) |
| { |
| args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| |
| NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); |
| } |
| |
| /* |
| * Validate NFSv4 mount options |
| */ |
| static int nfs4_validate_mount_data(void *options, |
| struct nfs_parsed_mount_data *args, |
| const char *dev_name) |
| { |
| struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; |
| struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
| char *c; |
| |
| if (data == NULL) |
| goto out_no_data; |
| |
| args->version = 4; |
| |
| switch (data->version) { |
| case 1: |
| if (data->host_addrlen > sizeof(args->nfs_server.address)) |
| goto out_no_address; |
| if (data->host_addrlen == 0) |
| goto out_no_address; |
| args->nfs_server.addrlen = data->host_addrlen; |
| if (copy_from_user(sap, data->host_addr, data->host_addrlen)) |
| return -EFAULT; |
| if (!nfs_verify_server_address(sap)) |
| goto out_no_address; |
| |
| 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: |
| return NFS_TEXT_DATA; |
| } |
| |
| return 0; |
| |
| out_no_data: |
| dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); |
| return -EINVAL; |
| |
| out_inval_auth: |
| dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", |
| data->auth_flavourlen); |
| return -EINVAL; |
| |
| out_no_address: |
| dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); |
| return -EINVAL; |
| } |
| |
| /* |
| * Get the superblock for the NFS4 root partition |
| */ |
| static struct dentry * |
| nfs4_remote_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *info) |
| { |
| struct nfs_mount_info *mount_info = info; |
| struct nfs_server *server; |
| struct dentry *mntroot = ERR_PTR(-ENOMEM); |
| |
| mount_info->fill_super = nfs4_fill_super; |
| mount_info->set_security = nfs_set_sb_security; |
| |
| /* Get a volume representation */ |
| server = nfs4_create_server(mount_info->parsed, mount_info->mntfh); |
| if (IS_ERR(server)) { |
| mntroot = ERR_CAST(server); |
| goto out; |
| } |
| |
| mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info); |
| |
| out: |
| return mntroot; |
| } |
| |
| static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, |
| int flags, void *data, const char *hostname) |
| { |
| struct vfsmount *root_mnt; |
| char *root_devname; |
| size_t len; |
| |
| len = strlen(hostname) + 5; |
| root_devname = kmalloc(len, GFP_KERNEL); |
| if (root_devname == NULL) |
| return ERR_PTR(-ENOMEM); |
| /* Does hostname needs to be enclosed in brackets? */ |
| if (strchr(hostname, ':')) |
| snprintf(root_devname, len, "[%s]:/", hostname); |
| else |
| snprintf(root_devname, len, "%s:/", hostname); |
| root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); |
| kfree(root_devname); |
| return root_mnt; |
| } |
| |
| struct nfs_referral_count { |
| struct list_head list; |
| const struct task_struct *task; |
| unsigned int referral_count; |
| }; |
| |
| static LIST_HEAD(nfs_referral_count_list); |
| static DEFINE_SPINLOCK(nfs_referral_count_list_lock); |
| |
| static struct nfs_referral_count *nfs_find_referral_count(void) |
| { |
| struct nfs_referral_count *p; |
| |
| list_for_each_entry(p, &nfs_referral_count_list, list) { |
| if (p->task == current) |
| return p; |
| } |
| return NULL; |
| } |
| |
| #define NFS_MAX_NESTED_REFERRALS 2 |
| |
| static int nfs_referral_loop_protect(void) |
| { |
| struct nfs_referral_count *p, *new; |
| int ret = -ENOMEM; |
| |
| new = kmalloc(sizeof(*new), GFP_KERNEL); |
| if (!new) |
| goto out; |
| new->task = current; |
| new->referral_count = 1; |
| |
| ret = 0; |
| spin_lock(&nfs_referral_count_list_lock); |
| p = nfs_find_referral_count(); |
| if (p != NULL) { |
| if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) |
| ret = -ELOOP; |
| else |
| p->referral_count++; |
| } else { |
| list_add(&new->list, &nfs_referral_count_list); |
| new = NULL; |
| } |
| spin_unlock(&nfs_referral_count_list_lock); |
| kfree(new); |
| out: |
| return ret; |
| } |
| |
| static void nfs_referral_loop_unprotect(void) |
| { |
| struct nfs_referral_count *p; |
| |
| spin_lock(&nfs_referral_count_list_lock); |
| p = nfs_find_referral_count(); |
| p->referral_count--; |
| if (p->referral_count == 0) |
| list_del(&p->list); |
| else |
| p = NULL; |
| spin_unlock(&nfs_referral_count_list_lock); |
| kfree(p); |
| } |
| |
| static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, |
| const char *export_path) |
| { |
| struct dentry *dentry; |
| int err; |
| |
| if (IS_ERR(root_mnt)) |
| return ERR_CAST(root_mnt); |
| |
| err = nfs_referral_loop_protect(); |
| if (err) { |
| mntput(root_mnt); |
| return ERR_PTR(err); |
| } |
| |
| dentry = mount_subtree(root_mnt, export_path); |
| nfs_referral_loop_unprotect(); |
| |
| return dentry; |
| } |
| |
| static struct dentry *nfs4_try_mount(int flags, const char *dev_name, |
| struct nfs_mount_info *mount_info) |
| { |
| char *export_path; |
| struct vfsmount *root_mnt; |
| struct dentry *res; |
| struct nfs_parsed_mount_data *data = mount_info->parsed; |
| |
| dfprintk(MOUNT, "--> nfs4_try_mount()\n"); |
| |
| export_path = data->nfs_server.export_path; |
| data->nfs_server.export_path = "/"; |
| root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info, |
| data->nfs_server.hostname); |
| data->nfs_server.export_path = export_path; |
| |
| res = nfs_follow_remote_path(root_mnt, export_path); |
| |
| dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", |
| IS_ERR(res) ? PTR_ERR(res) : 0, |
| IS_ERR(res) ? " [error]" : ""); |
| return res; |
| } |
| |
| /* |
| * Clone an NFS4 server record on xdev traversal (FSID-change) |
| */ |
| static struct dentry * |
| nfs4_xdev_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *raw_data) |
| { |
| struct nfs_mount_info mount_info = { |
| .fill_super = nfs4_clone_super, |
| .set_security = nfs_clone_sb_security, |
| .cloned = raw_data, |
| }; |
| return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info); |
| } |
| |
| static struct dentry * |
| nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *raw_data) |
| { |
| struct nfs_mount_info mount_info = { |
| .fill_super = nfs4_fill_super, |
| .set_security = nfs_clone_sb_security, |
| .cloned = raw_data, |
| }; |
| struct nfs_server *server; |
| struct dentry *mntroot = ERR_PTR(-ENOMEM); |
| |
| dprintk("--> nfs4_referral_get_sb()\n"); |
| |
| mount_info.mntfh = nfs_alloc_fhandle(); |
| if (mount_info.cloned == NULL || mount_info.mntfh == NULL) |
| goto out; |
| |
| /* create a new volume representation */ |
| server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh); |
| if (IS_ERR(server)) { |
| mntroot = ERR_CAST(server); |
| goto out; |
| } |
| |
| mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, &mount_info); |
| out: |
| nfs_free_fhandle(mount_info.mntfh); |
| return mntroot; |
| } |
| |
| /* |
| * Create an NFS4 server record on referral traversal |
| */ |
| static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data) |
| { |
| struct nfs_clone_mount *data = raw_data; |
| char *export_path; |
| struct vfsmount *root_mnt; |
| struct dentry *res; |
| |
| dprintk("--> nfs4_referral_mount()\n"); |
| |
| export_path = data->mnt_path; |
| data->mnt_path = "/"; |
| |
| root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, |
| flags, data, data->hostname); |
| data->mnt_path = export_path; |
| |
| res = nfs_follow_remote_path(root_mnt, export_path); |
| dprintk("<-- nfs4_referral_mount() = %ld%s\n", |
| IS_ERR(res) ? PTR_ERR(res) : 0, |
| IS_ERR(res) ? " [error]" : ""); |
| return res; |
| } |
| |
| #endif /* CONFIG_NFS_V4 */ |