diff options
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 2161 |
1 files changed, 934 insertions, 1227 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index b68c8607770..084af1060d7 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -31,6 +31,7 @@ #include <linux/errno.h> #include <linux/unistd.h> #include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/addr.h> #include <linux/sunrpc/stats.h> #include <linux/sunrpc/metrics.h> #include <linux/sunrpc/xprtsock.h> @@ -41,7 +42,6 @@ #include <linux/lockd/bind.h> #include <linux/seq_file.h> #include <linux/mount.h> -#include <linux/mnt_namespace.h> #include <linux/namei.h> #include <linux/nfs_idmap.h> #include <linux/vfs.h> @@ -53,8 +53,9 @@ #include <linux/nfs_xdr.h> #include <linux/magic.h> #include <linux/parser.h> +#include <linux/nsproxy.h> +#include <linux/rcupdate.h> -#include <asm/system.h> #include <asm/uaccess.h> #include "nfs4_fs.h" @@ -63,10 +64,14 @@ #include "iostat.h" #include "internal.h" #include "fscache.h" +#include "nfs4session.h" +#include "pnfs.h" +#include "nfs.h" #define NFSDBG_FACILITY NFSDBG_VFS +#define NFS_TEXT_DATA 1 -#ifdef CONFIG_NFS_V3 +#if IS_ENABLED(CONFIG_NFS_V3) #define NFS_DEFAULT_VERSION 3 #else #define NFS_DEFAULT_VERSION 2 @@ -79,13 +84,13 @@ enum { Opt_cto, Opt_nocto, Opt_ac, Opt_noac, Opt_lock, Opt_nolock, - Opt_v2, Opt_v3, Opt_v4, Opt_udp, Opt_tcp, Opt_rdma, Opt_acl, Opt_noacl, Opt_rdirplus, Opt_nordirplus, Opt_sharecache, Opt_nosharecache, Opt_resvport, Opt_noresvport, Opt_fscache, Opt_nofscache, + Opt_migration, Opt_nomigration, /* Mount options that take integer arguments */ Opt_port, @@ -97,10 +102,10 @@ enum { Opt_namelen, Opt_mountport, Opt_mountvers, - Opt_nfsvers, 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, @@ -132,9 +137,6 @@ static const match_table_t nfs_mount_option_tokens = { { Opt_noac, "noac" }, { Opt_lock, "lock" }, { Opt_nolock, "nolock" }, - { Opt_v2, "v2" }, - { Opt_v3, "v3" }, - { Opt_v4, "v4" }, { Opt_udp, "udp" }, { Opt_tcp, "tcp" }, { Opt_rdma, "rdma" }, @@ -148,6 +150,8 @@ static const match_table_t nfs_mount_option_tokens = { { Opt_noresvport, "noresvport" }, { Opt_fscache, "fsc" }, { Opt_nofscache, "nofsc" }, + { Opt_migration, "migration" }, + { Opt_nomigration, "nomigration" }, { Opt_port, "port=%s" }, { Opt_rsize, "rsize=%s" }, @@ -163,9 +167,10 @@ static const match_table_t nfs_mount_option_tokens = { { 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_minorversion, "minorversion=%s" }, { Opt_sec, "sec=%s" }, { Opt_proto, "proto=%s" }, @@ -179,6 +184,9 @@ static const match_table_t nfs_mount_option_tokens = { { 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 } }; @@ -259,120 +267,101 @@ static match_table_t nfs_local_lock_tokens = { { Opt_local_lock_err, NULL } }; +enum { + Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, + Opt_vers_4_1, Opt_vers_4_2, + + Opt_vers_err +}; + +static match_table_t nfs_vers_tokens = { + { Opt_vers_2, "2" }, + { Opt_vers_3, "3" }, + { Opt_vers_4, "4" }, + { Opt_vers_4_0, "4.0" }, + { Opt_vers_4_1, "4.1" }, + { Opt_vers_4_2, "4.2" }, + + { Opt_vers_err, NULL } +}; -static 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 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 = { +struct file_system_type nfs_fs_type = { .owner = THIS_MODULE, .name = "nfs", - .get_sb = nfs_get_sb, + .mount = nfs_fs_mount, .kill_sb = nfs_kill_super, - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, + .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, }; +MODULE_ALIAS_FS("nfs"); +EXPORT_SYMBOL_GPL(nfs_fs_type); struct file_system_type nfs_xdev_fs_type = { .owner = THIS_MODULE, .name = "nfs", .mount = nfs_xdev_mount, .kill_sb = nfs_kill_super, - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, + .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, }; -static const struct super_operations nfs_sops = { +const struct super_operations nfs_sops = { .alloc_inode = nfs_alloc_inode, .destroy_inode = nfs_destroy_inode, .write_inode = nfs_write_inode, + .drop_inode = nfs_drop_inode, .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, }; +EXPORT_SYMBOL_GPL(nfs_sops); -#ifdef CONFIG_NFS_V4 -static int nfs4_validate_text_mount_data(void *options, +#if IS_ENABLED(CONFIG_NFS_V4) +static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); +static int nfs4_validate_mount_data(void *options, struct nfs_parsed_mount_data *args, const char *dev_name); -static int nfs4_try_mount(int flags, const char *dev_name, - struct nfs_parsed_mount_data *data, struct vfsmount *mnt); -static int nfs4_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); -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 int nfs4_referral_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); -static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data); -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, -}; -static struct file_system_type nfs4_remote_fs_type = { +struct file_system_type nfs4_fs_type = { .owner = THIS_MODULE, .name = "nfs4", - .mount = nfs4_remote_mount, - .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", - .mount = nfs4_xdev_mount, - .kill_sb = nfs4_kill_super, - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, + .mount = nfs_fs_mount, + .kill_sb = nfs_kill_super, + .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, }; +MODULE_ALIAS_FS("nfs4"); +MODULE_ALIAS("nfs4"); +EXPORT_SYMBOL_GPL(nfs4_fs_type); -static struct file_system_type nfs4_remote_referral_fs_type = { - .owner = THIS_MODULE, - .name = "nfs4", - .mount = nfs4_remote_referral_mount, - .kill_sb = nfs4_kill_super, - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, -}; +static int __init register_nfs4_fs(void) +{ + return register_filesystem(&nfs4_fs_type); +} -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 void unregister_nfs4_fs(void) +{ + unregister_filesystem(&nfs4_fs_type); +} +#else +static int __init register_nfs4_fs(void) +{ + return 0; +} -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_stats = nfs_show_stats, - .remount_fs = nfs_remount, -}; +static void unregister_nfs4_fs(void) +{ +} #endif static struct shrinker acl_shrinker = { - .shrink = nfs_access_cache_shrinker, + .count_objects = nfs_access_cache_count, + .scan_objects = nfs_access_cache_scan, .seeks = DEFAULT_SEEKS, }; @@ -387,21 +376,18 @@ int __init register_nfs_fs(void) if (ret < 0) goto error_0; - ret = nfs_register_sysctl(); + ret = register_nfs4_fs(); if (ret < 0) goto error_1; -#ifdef CONFIG_NFS_V4 - ret = register_filesystem(&nfs4_fs_type); + + ret = nfs_register_sysctl(); if (ret < 0) goto error_2; -#endif register_shrinker(&acl_shrinker); return 0; -#ifdef CONFIG_NFS_V4 error_2: - nfs_unregister_sysctl(); -#endif + unregister_nfs4_fs(); error_1: unregister_filesystem(&nfs_fs_type); error_0: @@ -414,10 +400,8 @@ error_0: void __exit unregister_nfs_fs(void) { unregister_shrinker(&acl_shrinker); -#ifdef CONFIG_NFS_V4 - unregister_filesystem(&nfs4_fs_type); -#endif nfs_unregister_sysctl(); + unregister_nfs4_fs(); unregister_filesystem(&nfs_fs_type); } @@ -428,6 +412,7 @@ void nfs_sb_active(struct super_block *sb) if (atomic_inc_return(&server->active) == 1) atomic_inc(&sb->s_active); } +EXPORT_SYMBOL_GPL(nfs_sb_active); void nfs_sb_deactive(struct super_block *sb) { @@ -436,11 +421,12 @@ void nfs_sb_deactive(struct super_block *sb) if (atomic_dec_and_test(&server->active)) deactivate_super(sb); } +EXPORT_SYMBOL_GPL(nfs_sb_deactive); /* * Deliver file system statistics to userspace */ -static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) +int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct nfs_server *server = NFS_SB(dentry->d_sb); unsigned char blockbits; @@ -501,6 +487,7 @@ static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) dprintk("%s: statfs error = %d\n", __func__, -error); return error; } +EXPORT_SYMBOL_GPL(nfs_statfs); /* * Map the security flavour number to a name @@ -510,7 +497,8 @@ static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) static const struct { rpc_authflavor_t flavour; const char *str; - } sec_flavours[] = { + } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { + /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ { RPC_AUTH_NULL, "null" }, { RPC_AUTH_UNIX, "sys" }, { RPC_AUTH_GSS_KRB5, "krb5" }, @@ -606,14 +594,13 @@ static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, nfs_show_mountd_netid(m, nfss, showdefaults); } -#ifdef CONFIG_NFS_V4 +#if IS_ENABLED(CONFIG_NFS_V4) static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { struct nfs_client *clp = nfss->nfs_client; seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); - seq_printf(m, ",minorversion=%u", clp->cl_minorversion); } #else static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, @@ -622,6 +609,15 @@ static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, } #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 */ @@ -649,7 +645,7 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, u32 version = clp->rpc_ops->version; int local_flock, local_fcntl; - seq_printf(m, ",vers=%u", version); + 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) @@ -669,8 +665,10 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 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); @@ -690,6 +688,9 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, if (nfss->options & NFS_OPTION_FSCACHE) seq_printf(m, ",fsc"); + if (nfss->options & NFS_OPTION_MIGRATION) + seq_printf(m, ",migration"); + if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) seq_printf(m, ",lookupcache=none"); @@ -713,26 +714,96 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, /* * Describe the mount options on this VFS mountpoint */ -static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) +int nfs_show_options(struct seq_file *m, struct dentry *root) { - struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); + struct nfs_server *nfss = NFS_SB(root->d_sb); nfs_show_mount_options(m, nfss, 0); + rcu_read_lock(); seq_printf(m, ",addr=%s", rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, RPC_DISPLAY_ADDR)); + rcu_read_unlock(); return 0; } +EXPORT_SYMBOL_GPL(nfs_show_options); + +#if IS_ENABLED(CONFIG_NFS_V4) +#ifdef CONFIG_NFS_V4_1 +static void show_sessions(struct seq_file *m, struct nfs_server *server) +{ + if (nfs4_has_session(server->nfs_client)) + seq_printf(m, ",sessions"); +} +#else +static void show_sessions(struct seq_file *m, struct nfs_server *server) {} +#endif +#endif + +#ifdef CONFIG_NFS_V4_1 +static void show_pnfs(struct seq_file *m, struct nfs_server *server) +{ + seq_printf(m, ",pnfs="); + if (server->pnfs_curr_ld) + seq_printf(m, "%s", server->pnfs_curr_ld->name); + else + seq_printf(m, "not configured"); +} + +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) +{ + if (nfss->nfs_client && nfss->nfs_client->cl_implid) { + struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; + seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," + "date='%llu,%u'", + impl_id->name, impl_id->domain, + impl_id->date.seconds, impl_id->date.nseconds); + } +} +#else +#if IS_ENABLED(CONFIG_NFS_V4) +static void show_pnfs(struct seq_file *m, struct nfs_server *server) +{ +} +#endif +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) +{ +} +#endif + +int nfs_show_devname(struct seq_file *m, struct dentry *root) +{ + char *page = (char *) __get_free_page(GFP_KERNEL); + char *devname, *dummy; + int err = 0; + if (!page) + return -ENOMEM; + devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); + if (IS_ERR(devname)) + err = PTR_ERR(devname); + else + seq_escape(m, devname, " \t\n\\"); + free_page((unsigned long)page); + return err; +} +EXPORT_SYMBOL_GPL(nfs_show_devname); + +int nfs_show_path(struct seq_file *m, struct dentry *dentry) +{ + seq_puts(m, "/"); + return 0; +} +EXPORT_SYMBOL_GPL(nfs_show_path); /* * Present statistical information for this VFS mountpoint */ -static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) +int nfs_show_stats(struct seq_file *m, struct dentry *root) { int i, cpu; - struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); + struct nfs_server *nfss = NFS_SB(root->d_sb); struct rpc_auth *auth = nfss->client->cl_auth; struct nfs_iostats totals = { }; @@ -742,14 +813,16 @@ static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) * 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" : ""); + 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); @@ -757,12 +830,15 @@ static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) seq_printf(m, ",bsize=%u", nfss->bsize); seq_printf(m, ",namlen=%u", nfss->namelen); -#ifdef CONFIG_NFS_V4 +#if IS_ENABLED(CONFIG_NFS_V4) if (nfss->nfs_client->rpc_ops->version == 4) { seq_printf(m, "\n\tnfsv4:\t"); seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); + seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); + show_sessions(m, nfss); + show_pnfs(m, nfss); } #endif @@ -813,12 +889,13 @@ static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) return 0; } +EXPORT_SYMBOL_GPL(nfs_show_stats); /* * Begin unmount by attempting to remove all automounted mountpoints we added * in response to xdev traversals and referrals */ -static void nfs_umount_begin(struct super_block *sb) +void nfs_umount_begin(struct super_block *sb) { struct nfs_server *server; struct rpc_clnt *rpc; @@ -832,8 +909,9 @@ static void nfs_umount_begin(struct super_block *sb) if (!IS_ERR(rpc)) rpc_killall_tasks(rpc); } +EXPORT_SYMBOL_GPL(nfs_umount_begin); -static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) +static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) { struct nfs_parsed_mount_data *data; @@ -846,14 +924,28 @@ static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int ve 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->version = version; + data->selected_flavor = RPC_AUTH_MAXFLAVOR; data->minorversion = 0; + data->need_mount = true; + data->net = current->nsproxy->net_ns; + security_init_mnt_opts(&data->lsm_opts); } return data; } +static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) +{ + if (data) { + kfree(data->client_address); + kfree(data->mount_server.hostname); + kfree(data->nfs_server.export_path); + kfree(data->nfs_server.hostname); + kfree(data->fscache_uniq); + security_free_mnt_opts(&data->lsm_opts); + kfree(data); + } +} + /* * Sanity-check a server address provided by the mount command. * @@ -928,57 +1020,170 @@ static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) } /* + * Add 'flavor' to 'auth_info' if not already present. + * Returns true if 'flavor' ends up in the list, false otherwise + */ +static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, + rpc_authflavor_t flavor) +{ + unsigned int i; + unsigned int max_flavor_len = (sizeof(auth_info->flavors) / + sizeof(auth_info->flavors[0])); + + /* make sure this flavor isn't already in the list */ + for (i = 0; i < auth_info->flavor_len; i++) { + if (flavor == auth_info->flavors[i]) + return true; + } + + if (auth_info->flavor_len + 1 >= max_flavor_len) { + dfprintk(MOUNT, "NFS: too many sec= flavors\n"); + return false; + } + + auth_info->flavors[auth_info->flavor_len++] = flavor; + return true; +} + +/* + * Return true if 'match' is in auth_info or auth_info is empty. + * Return false otherwise. + */ +bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, + rpc_authflavor_t match) +{ + int i; + + if (!auth_info->flavor_len) + return true; + + for (i = 0; i < auth_info->flavor_len; i++) { + if (auth_info->flavors[i] == match) + return true; + } + return false; +} +EXPORT_SYMBOL_GPL(nfs_auth_info_match); + +/* * Parse the value of the 'sec=' option. */ static int nfs_parse_security_flavors(char *value, struct nfs_parsed_mount_data *mnt) { substring_t args[MAX_OPT_ARGS]; + rpc_authflavor_t pseudoflavor; + char *p; dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); - 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; + while ((p = strsep(&value, ":")) != NULL) { + switch (match_token(p, nfs_secflavor_tokens, args)) { + case Opt_sec_none: + pseudoflavor = RPC_AUTH_NULL; + break; + case Opt_sec_sys: + pseudoflavor = RPC_AUTH_UNIX; + break; + case Opt_sec_krb5: + pseudoflavor = RPC_AUTH_GSS_KRB5; + break; + case Opt_sec_krb5i: + pseudoflavor = RPC_AUTH_GSS_KRB5I; + break; + case Opt_sec_krb5p: + pseudoflavor = RPC_AUTH_GSS_KRB5P; + break; + case Opt_sec_lkey: + pseudoflavor = RPC_AUTH_GSS_LKEY; + break; + case Opt_sec_lkeyi: + pseudoflavor = RPC_AUTH_GSS_LKEYI; + break; + case Opt_sec_lkeyp: + pseudoflavor = RPC_AUTH_GSS_LKEYP; + break; + case Opt_sec_spkm: + pseudoflavor = RPC_AUTH_GSS_SPKM; + break; + case Opt_sec_spkmi: + pseudoflavor = RPC_AUTH_GSS_SPKMI; + break; + case Opt_sec_spkmp: + pseudoflavor = RPC_AUTH_GSS_SPKMP; + break; + default: + dfprintk(MOUNT, + "NFS: sec= option '%s' not recognized\n", p); + return 0; + } + + if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) + return 0; + } + + return 1; +} + +static int nfs_parse_version_string(char *string, + struct nfs_parsed_mount_data *mnt, + substring_t *args) +{ + mnt->flags &= ~NFS_MOUNT_VER3; + switch (match_token(string, nfs_vers_tokens, args)) { + case Opt_vers_2: + mnt->version = 2; break; - case Opt_sec_lkeyi: - mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; + case Opt_vers_3: + mnt->flags |= NFS_MOUNT_VER3; + mnt->version = 3; break; - case Opt_sec_lkeyp: - mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; + 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_sec_spkm: - mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; + case Opt_vers_4_0: + mnt->version = 4; + mnt->minorversion = 0; break; - case Opt_sec_spkmi: - mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; + case Opt_vers_4_1: + mnt->version = 4; + mnt->minorversion = 1; break; - case Opt_sec_spkmp: - mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; + case Opt_vers_4_2: + mnt->version = 4; + mnt->minorversion = 2; break; default: return 0; } - - mnt->auth_flavor_len = 1; return 1; } +static int nfs_get_option_str(substring_t args[], char **option) +{ + kfree(*option); + *option = match_strdup(args); + return !*option; +} + +static int nfs_get_option_ul(substring_t args[], unsigned long *option) +{ + int rc; + char *string; + + string = match_strdup(args); + if (string == NULL) + return -ENOMEM; + rc = kstrtoul(string, 10, option); + kfree(string); + + return rc; +} + /* * Error-check and convert a string of mount options from user space into * a data structure. The whole mount string is processed; bad options are @@ -1063,18 +1268,6 @@ static int nfs_parse_mount_options(char *raw, mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); break; - case Opt_v2: - mnt->flags &= ~NFS_MOUNT_VER3; - mnt->version = 2; - break; - case Opt_v3: - mnt->flags |= NFS_MOUNT_VER3; - mnt->version = 3; - break; - case Opt_v4: - mnt->flags &= ~NFS_MOUNT_VER3; - mnt->version = 4; - break; case Opt_udp: mnt->flags &= ~NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; @@ -1122,185 +1315,93 @@ static int nfs_parse_mount_options(char *raw, kfree(mnt->fscache_uniq); mnt->fscache_uniq = NULL; break; + case Opt_migration: + mnt->options |= NFS_OPTION_MIGRATION; + break; + case Opt_nomigration: + mnt->options &= NFS_OPTION_MIGRATION; + break; /* * options that take numeric values */ case Opt_port: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0 || option > USHRT_MAX) + if (nfs_get_option_ul(args, &option) || + option > USHRT_MAX) goto out_invalid_value; mnt->nfs_server.port = option; break; case Opt_rsize: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->rsize = option; break; case Opt_wsize: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->wsize = option; break; case Opt_bsize: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->bsize = option; break; case Opt_timeo: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0 || option == 0) + if (nfs_get_option_ul(args, &option) || option == 0) goto out_invalid_value; mnt->timeo = option; break; case Opt_retrans: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0 || option == 0) + if (nfs_get_option_ul(args, &option) || option == 0) goto out_invalid_value; mnt->retrans = option; break; case Opt_acregmin: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acregmin = option; break; case Opt_acregmax: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acregmax = option; break; case Opt_acdirmin: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acdirmin = option; break; case Opt_acdirmax: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acdirmax = option; break; case Opt_actimeo: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->acregmin = mnt->acregmax = mnt->acdirmin = mnt->acdirmax = option; break; case Opt_namelen: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; mnt->namlen = option; break; case Opt_mountport: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0 || option > USHRT_MAX) + if (nfs_get_option_ul(args, &option) || + option > USHRT_MAX) goto out_invalid_value; mnt->mount_server.port = option; break; case Opt_mountvers: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0 || + 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_nfsvers: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) - goto out_invalid_value; - switch (option) { - case NFS2_VERSION: - mnt->flags &= ~NFS_MOUNT_VER3; - mnt->version = 2; - break; - case NFS3_VERSION: - mnt->flags |= NFS_MOUNT_VER3; - mnt->version = 3; - break; - case NFS4_VERSION: - mnt->flags &= ~NFS_MOUNT_VER3; - mnt->version = 4; - break; - default: - goto out_invalid_value; - } - break; case Opt_minorversion: - string = match_strdup(args); - if (string == NULL) - goto out_nomem; - rc = strict_strtoul(string, 10, &option); - kfree(string); - if (rc != 0) + if (nfs_get_option_ul(args, &option)) goto out_invalid_value; if (option > NFS4_MAX_MINOR_VERSION) goto out_invalid_value; @@ -1310,6 +1411,15 @@ static int nfs_parse_mount_options(char *raw, /* * 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) @@ -1336,21 +1446,18 @@ static int nfs_parse_mount_options(char *raw, case Opt_xprt_udp: mnt->flags &= ~NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; - kfree(string); break; case Opt_xprt_tcp6: protofamily = AF_INET6; case Opt_xprt_tcp: mnt->flags |= NFS_MOUNT_TCP; mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; - kfree(string); 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); - kfree(string); break; default: dfprintk(MOUNT, "NFS: unrecognized " @@ -1358,6 +1465,7 @@ static int nfs_parse_mount_options(char *raw, kfree(string); return 0; } + kfree(string); break; case Opt_mountproto: string = match_strdup(args); @@ -1391,7 +1499,7 @@ static int nfs_parse_mount_options(char *raw, if (string == NULL) goto out_nomem; mnt->nfs_server.addrlen = - rpc_pton(string, strlen(string), + rpc_pton(mnt->net, string, strlen(string), (struct sockaddr *) &mnt->nfs_server.address, sizeof(mnt->nfs_server.address)); @@ -1400,25 +1508,20 @@ static int nfs_parse_mount_options(char *raw, goto out_invalid_address; break; case Opt_clientaddr: - string = match_strdup(args); - if (string == NULL) + if (nfs_get_option_str(args, &mnt->client_address)) goto out_nomem; - kfree(mnt->client_address); - mnt->client_address = string; break; case Opt_mounthost: - string = match_strdup(args); - if (string == NULL) + if (nfs_get_option_str(args, + &mnt->mount_server.hostname)) 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; mnt->mount_server.addrlen = - rpc_pton(string, strlen(string), + rpc_pton(mnt->net, string, strlen(string), (struct sockaddr *) &mnt->mount_server.address, sizeof(mnt->mount_server.address)); @@ -1451,11 +1554,8 @@ static int nfs_parse_mount_options(char *raw, }; break; case Opt_fscache_uniq: - string = match_strdup(args); - if (string == NULL) + if (nfs_get_option_str(args, &mnt->fscache_uniq)) goto out_nomem; - kfree(mnt->fscache_uniq); - mnt->fscache_uniq = string; mnt->options |= NFS_OPTION_FSCACHE; break; case Opt_local_lock: @@ -1510,9 +1610,16 @@ static int nfs_parse_mount_options(char *raw, if (!sloppy && invalid_option) return 0; + if (mnt->minorversion && mnt->version != 4) + goto out_minorversion_mismatch; + + if (mnt->options & NFS_OPTION_MIGRATION && + (mnt->version != 4 || mnt->minorversion != 0)) + goto out_migration_misuse; + /* * verify that any proto=/mountproto= options match the address - * familiies in the addr=/mountaddr= options. + * families in the addr=/mountaddr= options. */ if (protofamily != AF_UNSPEC && protofamily != mnt->nfs_server.address.ss_family) @@ -1543,6 +1650,14 @@ out_invalid_address: out_invalid_value: printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); return 0; +out_minorversion_mismatch: + printk(KERN_INFO "NFS: mount option vers=%u does not support " + "minorversion=%u\n", mnt->version, mnt->minorversion); + return 0; +out_migration_misuse: + printk(KERN_INFO + "NFS: 'migration' not supported for this NFS version\n"); + return 0; out_nomem: printk(KERN_INFO "NFS: not enough memory to parse option\n"); return 0; @@ -1553,60 +1668,51 @@ out_security_failure: } /* - * 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. + * Ensure that a specified authtype in args->auth_info is supported by + * the server. Returns 0 and sets args->selected_flavor if it's ok, and + * -EACCES if not. */ -static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, - struct nfs_mount_request *request) +static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, + rpc_authflavor_t *server_authlist, unsigned int count) { - unsigned int i, j, server_authlist_len = *(request->auth_flav_len); + rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; + unsigned int i; /* - * 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. + * If the sec= mount option is used, the specified flavor or AUTH_NULL + * must be in the list returned by the server. * - * 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. + * AUTH_NULL has a special meaning when it's in the server list - it + * means that the server will ignore the rpc creds, so any flavor + * can be used. */ - for (i = 0; i < 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; - } + for (i = 0; i < count; i++) { + flavor = server_authlist[i]; + + if (nfs_auth_info_match(&args->auth_info, flavor) || + flavor == RPC_AUTH_NULL) + goto out; + } - dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); - nfs_umount(request); + dfprintk(MOUNT, + "NFS: specified auth flavors not supported by server\n"); return -EACCES; + +out: + args->selected_flavor = flavor; + dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); + return 0; } /* * Use the remote server's MOUNT service to request the NFS file handle * corresponding to the provided path. */ -static int nfs_try_mount(struct nfs_parsed_mount_data *args, - struct nfs_fh *root_fh) +static int nfs_request_mount(struct nfs_parsed_mount_data *args, + struct nfs_fh *root_fh, + rpc_authflavor_t *server_authlist, + unsigned int *server_authlist_len) { - 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, @@ -1614,8 +1720,9 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args, .protocol = args->mount_server.protocol, .fh = root_fh, .noresvport = args->flags & NFS_MOUNT_NORESVPORT, - .auth_flav_len = &server_authlist_len, + .auth_flav_len = server_authlist_len, .auth_flavs = server_authlist, + .net = args->net, }; int status; @@ -1657,107 +1764,153 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args, 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); + return 0; } -static int nfs_parse_simple_hostname(const char *dev_name, - char **hostname, size_t maxnamlen, - char **export_path, size_t maxpathlen) +static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, + struct nfs_subversion *nfs_mod) { - size_t len; - char *colon, *comma; - - colon = strchr(dev_name, ':'); - if (colon == NULL) - goto out_bad_devname; - - len = colon - dev_name; - if (len > maxnamlen) - goto out_hostname; + int status; + unsigned int i; + bool tried_auth_unix = false; + bool auth_null_in_list = false; + struct nfs_server *server = ERR_PTR(-EACCES); + struct nfs_parsed_mount_data *args = mount_info->parsed; + rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; + unsigned int authlist_len = ARRAY_SIZE(authlist); + + status = nfs_request_mount(args, mount_info->mntfh, authlist, + &authlist_len); + if (status) + return ERR_PTR(status); - /* N.B. caller will free nfs_server.hostname in all cases */ - *hostname = kstrndup(dev_name, len, GFP_KERNEL); - if (!*hostname) - goto out_nomem; + /* + * Was a sec= authflavor specified in the options? First, verify + * whether the server supports it, and then just try to use it if so. + */ + if (args->auth_info.flavor_len > 0) { + status = nfs_verify_authflavors(args, authlist, authlist_len); + dfprintk(MOUNT, "NFS: using auth flavor %u\n", + args->selected_flavor); + if (status) + return ERR_PTR(status); + return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); + } - /* kill possible hostname list: not supported */ - comma = strchr(*hostname, ','); - if (comma != NULL) { - if (comma == *hostname) - goto out_bad_devname; - *comma = '\0'; + /* + * No sec= option was provided. RFC 2623, section 2.7 suggests we + * SHOULD prefer the flavor listed first. However, some servers list + * AUTH_NULL first. Avoid ever choosing AUTH_NULL. + */ + for (i = 0; i < authlist_len; ++i) { + rpc_authflavor_t flavor; + struct rpcsec_gss_info info; + + flavor = authlist[i]; + switch (flavor) { + case RPC_AUTH_UNIX: + tried_auth_unix = true; + break; + case RPC_AUTH_NULL: + auth_null_in_list = true; + continue; + default: + if (rpcauth_get_gssinfo(flavor, &info) != 0) + continue; + /* Fallthrough */ + } + dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); + args->selected_flavor = flavor; + server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); + if (!IS_ERR(server)) + return server; } - colon++; - len = strlen(colon); - if (len > maxpathlen) - goto out_path; - *export_path = kstrndup(colon, len, GFP_KERNEL); - if (!*export_path) - goto out_nomem; + /* + * Nothing we tried so far worked. At this point, give up if we've + * already tried AUTH_UNIX or if the server's list doesn't contain + * AUTH_NULL + */ + if (tried_auth_unix || !auth_null_in_list) + return server; - dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); - return 0; + /* Last chance! Try AUTH_UNIX */ + dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); + args->selected_flavor = RPC_AUTH_UNIX; + return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); +} -out_bad_devname: - dfprintk(MOUNT, "NFS: device name not in host:path format\n"); - return -EINVAL; +struct dentry *nfs_try_mount(int flags, const char *dev_name, + struct nfs_mount_info *mount_info, + struct nfs_subversion *nfs_mod) +{ + struct nfs_server *server; -out_nomem: - dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); - return -ENOMEM; + if (mount_info->parsed->need_mount) + server = nfs_try_mount_request(mount_info, nfs_mod); + else + server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); -out_hostname: - dfprintk(MOUNT, "NFS: server hostname too long\n"); - return -ENAMETOOLONG; + if (IS_ERR(server)) + return ERR_CAST(server); -out_path: - dfprintk(MOUNT, "NFS: export pathname too long\n"); - return -ENAMETOOLONG; + return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); } +EXPORT_SYMBOL_GPL(nfs_try_mount); /* - * Hostname has square brackets around it because it contains one or - * more colons. We look for the first closing square bracket, and a - * colon must follow it. + * 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_protected_hostname(const char *dev_name, - char **hostname, size_t maxnamlen, - char **export_path, size_t maxpathlen) +static int nfs_parse_devname(const char *dev_name, + char **hostname, size_t maxnamlen, + char **export_path, size_t maxpathlen) { size_t len; - char *start, *end; + char *end; - start = (char *)(dev_name + 1); + /* 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(start, ']'); - if (end == NULL) - goto out_bad_devname; - if (*(end + 1) != ':') - goto out_bad_devname; + 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; + } - len = end - start; if (len > maxnamlen) goto out_hostname; /* N.B. caller will free nfs_server.hostname in all cases */ - *hostname = kstrndup(start, len, GFP_KERNEL); + *hostname = kstrndup(dev_name, len, GFP_KERNEL); if (*hostname == NULL) goto out_nomem; - - end += 2; - len = strlen(end); + 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: @@ -1778,29 +1931,6 @@ out_path: } /* - * Split "dev_name" into "hostname:export_path". - * - * The leftmost colon demarks the split between the server's hostname - * and the export path. If the hostname starts with a left square - * bracket, then it may contain colons. - * - * Note: caller frees hostname and export path, even on error. - */ -static int nfs_parse_devname(const char *dev_name, - char **hostname, size_t maxnamlen, - char **export_path, size_t maxpathlen) -{ - if (*dev_name == '[') - return nfs_parse_protected_hostname(dev_name, - hostname, maxnamlen, - export_path, maxpathlen); - - return nfs_parse_simple_hostname(dev_name, - hostname, maxnamlen, - export_path, maxpathlen); -} - -/* * Validate the NFS2/NFS3 mount data * - fills in the mount root filehandle * @@ -1816,17 +1946,19 @@ static int nfs_parse_devname(const char *dev_name, * + 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) +static int nfs23_validate_mount_data(void *options, + struct nfs_parsed_mount_data *args, + struct nfs_fh *mntfh, + const char *dev_name) { struct nfs_mount_data *data = (struct nfs_mount_data *)options; struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; + int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; if (data == NULL) goto out_no_data; + args->version = NFS_DEFAULT_VERSION; switch (data->version) { case 1: data->namlen = 0; @@ -1837,6 +1969,8 @@ static int nfs_validate_mount_data(void *options, goto out_no_v3; data->root.size = NFS2_FHSIZE; memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); + /* Turn off security negotiation */ + extra_flags |= NFS_MOUNT_SECFLAVOUR; case 4: if (data->flags & NFS_MOUNT_SECFLAVOUR) goto out_no_sec; @@ -1864,7 +1998,7 @@ static int nfs_validate_mount_data(void *options, * can deal with. */ args->flags = data->flags & NFS_MOUNT_FLAGMASK; - args->flags |= NFS_MOUNT_LEGACY_INTERFACE; + args->flags |= extra_flags; args->rsize = data->rsize; args->wsize = data->wsize; args->timeo = data->timeo; @@ -1873,9 +2007,11 @@ static int nfs_validate_mount_data(void *options, args->acregmax = data->acregmax; args->acdirmin = data->acdirmin; args->acdirmax = data->acdirmax; + args->need_mount = false; memcpy(sap, &data->addr, sizeof(data->addr)); args->nfs_server.addrlen = sizeof(data->addr); + args->nfs_server.port = ntohs(data->addr.sin_port); if (!nfs_verify_server_address(sap)) goto out_no_address; @@ -1887,7 +2023,9 @@ static int nfs_validate_mount_data(void *options, args->bsize = data->bsize; if (data->flags & NFS_MOUNT_SECFLAVOUR) - args->auth_flavors[0] = data->pseudoflavor; + args->selected_flavor = data->pseudoflavor; + else + args->selected_flavor = RPC_AUTH_UNIX; if (!args->nfs_server.hostname) goto out_nomem; @@ -1924,46 +2062,11 @@ static int nfs_validate_mount_data(void *options, } break; - default: { - int status; - - 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 - return nfs4_validate_text_mount_data(options, - args, dev_name); -#else - goto out_v4_not_compiled; -#endif - - nfs_set_port(sap, &args->nfs_server.port, 0); - - nfs_set_mount_transport_protocol(args); - - status = nfs_parse_devname(dev_name, - &args->nfs_server.hostname, - PAGE_SIZE, - &args->nfs_server.export_path, - NFS_MAXPATHLEN); - if (!status) - status = nfs_try_mount(args, mntfh); - - kfree(args->nfs_server.export_path); - args->nfs_server.export_path = NULL; - - if (status) - return status; - - break; - } + default: + return NFS_TEXT_DATA; } -#ifndef CONFIG_NFS_V3 +#if !IS_ENABLED(CONFIG_NFS_V3) if (args->version == 3) goto out_v3_not_compiled; #endif /* !CONFIG_NFS_V3 */ @@ -1983,18 +2086,12 @@ out_no_sec: dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); return -EINVAL; -#ifndef CONFIG_NFS_V3 +#if !IS_ENABLED(CONFIG_NFS_V3) out_v3_not_compiled: dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); return -EPROTONOSUPPORT; #endif /* !CONFIG_NFS_V3 */ -#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_nomem: dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); return -ENOMEM; @@ -2008,15 +2105,104 @@ out_invalid_fh: return -EINVAL; } +#if IS_ENABLED(CONFIG_NFS_V4) +static int nfs_validate_mount_data(struct file_system_type *fs_type, + void *options, + struct nfs_parsed_mount_data *args, + struct nfs_fh *mntfh, + const char *dev_name) +{ + if (fs_type == &nfs_fs_type) + return nfs23_validate_mount_data(options, args, mntfh, dev_name); + return nfs4_validate_mount_data(options, args, dev_name); +} +#else +static int nfs_validate_mount_data(struct file_system_type *fs_type, + void *options, + struct nfs_parsed_mount_data *args, + struct nfs_fh *mntfh, + const char *dev_name) +{ + return nfs23_validate_mount_data(options, args, mntfh, dev_name); +} +#endif + +static int nfs_validate_text_mount_data(void *options, + struct nfs_parsed_mount_data *args, + const char *dev_name) +{ + int port = 0; + int max_namelen = PAGE_SIZE; + int max_pathlen = NFS_MAXPATHLEN; + struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; + + if (nfs_parse_mount_options((char *)options, args) == 0) + return -EINVAL; + + if (!nfs_verify_server_address(sap)) + goto out_no_address; + + if (args->version == 4) { +#if IS_ENABLED(CONFIG_NFS_V4) + port = NFS_PORT; + max_namelen = NFS4_MAXNAMLEN; + max_pathlen = NFS4_MAXPATHLEN; + nfs_validate_transport_protocol(args); + if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) + goto out_invalid_transport_udp; + nfs4_validate_mount_flags(args); +#else + goto out_v4_not_compiled; +#endif /* CONFIG_NFS_V4 */ + } else + nfs_set_mount_transport_protocol(args); + + nfs_set_port(sap, &args->nfs_server.port, port); + + return nfs_parse_devname(dev_name, + &args->nfs_server.hostname, + max_namelen, + &args->nfs_server.export_path, + max_pathlen); + +#if !IS_ENABLED(CONFIG_NFS_V4) +out_v4_not_compiled: + dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); + return -EPROTONOSUPPORT; +#else +out_invalid_transport_udp: + dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); + return -EINVAL; +#endif /* !CONFIG_NFS_V4 */ + +out_no_address: + dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); + return -EINVAL; +} + +#define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ + | NFS_MOUNT_SECURE \ + | NFS_MOUNT_TCP \ + | NFS_MOUNT_VER3 \ + | NFS_MOUNT_KERBEROS \ + | NFS_MOUNT_NONLM \ + | NFS_MOUNT_BROKEN_SUID \ + | NFS_MOUNT_STRICTLOCK \ + | NFS_MOUNT_UNSHARED \ + | NFS_MOUNT_NORESVPORT \ + | NFS_MOUNT_LEGACY_INTERFACE) + static int nfs_compare_remount_data(struct nfs_server *nfss, struct nfs_parsed_mount_data *data) { - if (data->flags != nfss->flags || + if ((data->flags ^ nfss->flags) & NFS_MOUNT_CMP_FLAGMASK || data->rsize != nfss->rsize || data->wsize != nfss->wsize || + data->version != nfss->nfs_client->rpc_ops->version || + data->minorversion != nfss->nfs_client->cl_minorversion || data->retrans != nfss->client->cl_timeout->to_retries || - data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || + data->selected_flavor != nfss->client->cl_auth->au_flavor || data->acregmin != nfss->acregmin / HZ || data->acregmax != nfss->acregmax / HZ || data->acdirmin != nfss->acdirmin / HZ || @@ -2031,7 +2217,7 @@ nfs_compare_remount_data(struct nfs_server *nfss, return 0; } -static int +int nfs_remount(struct super_block *sb, int *flags, char *raw_data) { int error; @@ -2041,6 +2227,8 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data) struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; u32 nfsvers = nfss->nfs_client->rpc_ops->version; + sync_filesystem(sb); + /* * Userspace mount programs that send binary options generally send * them populated with default values. We have no way to know which @@ -2061,7 +2249,8 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data) 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->selected_flavor = nfss->client->cl_auth->au_flavor; + data->auth_info = nfss->auth_info; data->acregmin = nfss->acregmin / HZ; data->acregmax = nfss->acregmax / HZ; data->acdirmin = nfss->acdirmin / HZ; @@ -2069,25 +2258,38 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data) data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; data->nfs_server.port = nfss->port; data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; + data->version = nfsvers; + data->minorversion = nfss->nfs_client->cl_minorversion; + data->net = current->nsproxy->net_ns; memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, data->nfs_server.addrlen); /* overwrite those values with any that were specified */ - error = nfs_parse_mount_options((char *)options, data); - if (error < 0) + error = -EINVAL; + if (!nfs_parse_mount_options((char *)options, data)) goto out; + /* + * noac is a special case. It implies -o sync, but that's not + * necessarily reflected in the mtab options. do_remount_sb + * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the + * remount options, so we have to explicitly reset it. + */ + if (data->flags & NFS_MOUNT_NOAC) + *flags |= MS_SYNCHRONOUS; + /* compare new mount options with old ones */ error = nfs_compare_remount_data(nfss, data); out: kfree(data); return error; } +EXPORT_SYMBOL_GPL(nfs_remount); /* * Initialise the common bits of the superblock */ -static inline void nfs_initialise_sb(struct super_block *sb) +inline void nfs_initialise_sb(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); @@ -2095,15 +2297,12 @@ static inline void nfs_initialise_sb(struct super_block *sb) /* 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)); + "%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); - if (server->flags & NFS_MOUNT_NOAC) - sb->s_flags |= MS_SYNCHRONOUS; - sb->s_bdi = &server->backing_dev_info; nfs_super_set_maxbytes(sb, server->maxfilesize); @@ -2112,17 +2311,19 @@ static inline void nfs_initialise_sb(struct super_block *sb) /* * Finish setting up an NFS2/3 superblock */ -static void nfs_fill_super(struct super_block *sb, - struct nfs_parsed_mount_data *data) +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_xattr = server->nfs_client->cl_nfs_mod->xattr; + sb->s_op = server->nfs_client->cl_nfs_mod->sops; + if (data && data->bsize) sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); - if (server->nfs_client->rpc_ops->version == 3) { + if (server->nfs_client->rpc_ops->version != 2) { /* The VFS shouldn't apply the umask to mode bits. We will do * so ourselves when necessary. */ @@ -2130,31 +2331,32 @@ static void nfs_fill_super(struct super_block *sb, sb->s_time_gran = 1; } - sb->s_op = &nfs_sops; nfs_initialise_sb(sb); } +EXPORT_SYMBOL_GPL(nfs_fill_super); /* - * Finish setting up a cloned NFS2/3 superblock + * Finish setting up a cloned NFS2/3/4 superblock */ -static void nfs_clone_super(struct super_block *sb, - const struct super_block *old_sb) +void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) { + const struct super_block *old_sb = mount_info->cloned->sb; struct nfs_server *server = NFS_SB(sb); sb->s_blocksize_bits = old_sb->s_blocksize_bits; sb->s_blocksize = old_sb->s_blocksize; sb->s_maxbytes = old_sb->s_maxbytes; + sb->s_xattr = old_sb->s_xattr; + sb->s_op = old_sb->s_op; + sb->s_time_gran = 1; - if (server->nfs_client->rpc_ops->version == 3) { + if (server->nfs_client->rpc_ops->version != 2) { /* The VFS shouldn't apply the umask to mode bits. We will do * so ourselves when necessary. */ sb->s_flags |= MS_POSIXACL; - sb->s_time_gran = 1; } - sb->s_op = old_sb->s_op; nfs_initialise_sb(sb); } @@ -2168,7 +2370,7 @@ static int nfs_compare_mount_options(const struct super_block *s, const struct n goto Ebusy; if (a->nfs_client != b->nfs_client) goto Ebusy; - if (a->flags != b->flags) + if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) goto Ebusy; if (a->wsize != b->wsize) goto Ebusy; @@ -2182,7 +2384,8 @@ static int nfs_compare_mount_options(const struct super_block *s, const struct n goto Ebusy; if (a->acdirmax != b->acdirmax) goto Ebusy; - if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) + if (b->auth_info.flavor_len > 0 && + clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) goto Ebusy; return 1; Ebusy: @@ -2262,61 +2465,111 @@ static int nfs_compare_super(struct super_block *sb, void *data) return nfs_compare_mount_options(sb, server, mntflags); } +#ifdef CONFIG_NFS_FSCACHE +static void nfs_get_cache_cookie(struct super_block *sb, + struct nfs_parsed_mount_data *parsed, + struct nfs_clone_mount *cloned) +{ + struct nfs_server *nfss = NFS_SB(sb); + char *uniq = NULL; + int ulen = 0; + + nfss->fscache_key = NULL; + nfss->fscache = NULL; + + if (parsed) { + if (!(parsed->options & NFS_OPTION_FSCACHE)) + return; + if (parsed->fscache_uniq) { + uniq = parsed->fscache_uniq; + ulen = strlen(parsed->fscache_uniq); + } + } else if (cloned) { + struct nfs_server *mnt_s = NFS_SB(cloned->sb); + if (!(mnt_s->options & NFS_OPTION_FSCACHE)) + return; + if (mnt_s->fscache_key) { + uniq = mnt_s->fscache_key->key.uniquifier; + ulen = mnt_s->fscache_key->key.uniq_len; + }; + } else + return; + + nfs_fscache_get_super_cookie(sb, uniq, ulen); +} +#else +static void nfs_get_cache_cookie(struct super_block *sb, + struct nfs_parsed_mount_data *parsed, + struct nfs_clone_mount *cloned) +{ +} +#endif + static int nfs_bdi_register(struct nfs_server *server) { return bdi_register_dev(&server->backing_dev_info, server->s_dev); } -static int nfs_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) +int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, + struct nfs_mount_info *mount_info) +{ + int error; + unsigned long kflags = 0, kflags_out = 0; + if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) + kflags |= SECURITY_LSM_NATIVE_LABELS; + + error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, + kflags, &kflags_out); + if (error) + goto err; + + if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && + !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) + NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; +err: + return error; +} +EXPORT_SYMBOL_GPL(nfs_set_sb_security); + +int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, + struct nfs_mount_info *mount_info) +{ + /* clone any lsm security options from the parent to the new sb */ + if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) + return -ESTALE; + return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); +} +EXPORT_SYMBOL_GPL(nfs_clone_sb_security); + +struct dentry *nfs_fs_mount_common(struct nfs_server *server, + int flags, const char *dev_name, + struct nfs_mount_info *mount_info, + struct nfs_subversion *nfs_mod) { - struct nfs_server *server = NULL; struct super_block *s; - struct nfs_parsed_mount_data *data; - struct nfs_fh *mntfh; - struct dentry *mntroot; + 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 = -ENOMEM; - - data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); - mntfh = nfs_alloc_fhandle(); - 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; - -#ifdef CONFIG_NFS_V4 - if (data->version == 4) { - error = nfs4_try_mount(flags, dev_name, data, mnt); - kfree(data->client_address); - kfree(data->nfs_server.export_path); - goto out; - } -#endif /* CONFIG_NFS_V4 */ - - /* Get a volume representation */ - server = nfs_create_server(data, mntfh); - if (IS_ERR(server)) { - error = PTR_ERR(server); - goto out; - } - sb_mntdata.server = server; + int error; if (server->flags & NFS_MOUNT_UNSHARED) compare_super = NULL; + /* -o noac implies -o sync */ + if (server->flags & NFS_MOUNT_NOAC) + sb_mntdata.mntflags |= MS_SYNCHRONOUS; + + if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) + if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) + sb_mntdata.mntflags |= MS_SYNCHRONOUS; + /* Get a superblock - note that we may end up sharing one that already exists */ - s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); + s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); if (IS_ERR(s)) { - error = PTR_ERR(s); + mntroot = ERR_CAST(s); goto out_err_nosb; } @@ -2325,41 +2578,31 @@ static int nfs_get_sb(struct file_system_type *fs_type, server = NULL; } else { error = nfs_bdi_register(server); - if (error) + if (error) { + mntroot = ERR_PTR(error); goto error_splat_bdi; + } + server->super = s; } if (!s->s_root) { /* initial superblock/root creation */ - nfs_fill_super(s, data); - nfs_fscache_get_super_cookie( - s, data ? data->fscache_uniq : NULL, NULL); + mount_info->fill_super(s, mount_info); + nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); } - mntroot = nfs_get_root(s, mntfh); - if (IS_ERR(mntroot)) { - error = PTR_ERR(mntroot); + mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); + if (IS_ERR(mntroot)) goto error_splat_super; - } - error = security_sb_set_mnt_opts(s, &data->lsm_opts); + error = mount_info->set_security(s, mntroot, mount_info); 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); - kfree(data->fscache_uniq); - security_free_mnt_opts(&data->lsm_opts); -out_free_fh: - nfs_free_fhandle(mntfh); - kfree(data); - return error; + return mntroot; out_err_nosb: nfs_free_server(server); @@ -2367,6 +2610,7 @@ out_err_nosb: error_splat_root: dput(mntroot); + mntroot = ERR_PTR(error); error_splat_super: if (server && !s->s_root) bdi_unregister(&server->backing_dev_info); @@ -2374,22 +2618,65 @@ error_splat_bdi: deactivate_locked_super(s); goto out; } +EXPORT_SYMBOL_GPL(nfs_fs_mount_common); + +struct dentry *nfs_fs_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *raw_data) +{ + struct nfs_mount_info mount_info = { + .fill_super = nfs_fill_super, + .set_security = nfs_set_sb_security, + }; + struct dentry *mntroot = ERR_PTR(-ENOMEM); + struct nfs_subversion *nfs_mod; + int error; + + mount_info.parsed = nfs_alloc_parsed_mount_data(); + mount_info.mntfh = nfs_alloc_fhandle(); + if (mount_info.parsed == NULL || mount_info.mntfh == NULL) + goto out; + + /* Validate the mount data */ + error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); + if (error == NFS_TEXT_DATA) + error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); + if (error < 0) { + mntroot = ERR_PTR(error); + goto out; + } + + nfs_mod = get_nfs_version(mount_info.parsed->version); + if (IS_ERR(nfs_mod)) { + mntroot = ERR_CAST(nfs_mod); + goto out; + } + + mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); + + put_nfs_version(nfs_mod); +out: + nfs_free_parsed_mount_data(mount_info.parsed); + nfs_free_fhandle(mount_info.mntfh); + return mntroot; +} +EXPORT_SYMBOL_GPL(nfs_fs_mount); /* * Ensure that we unregister the bdi before kill_anon_super * releases the device name */ -static void nfs_put_super(struct super_block *s) +void nfs_put_super(struct super_block *s) { struct nfs_server *server = NFS_SB(s); bdi_unregister(&server->backing_dev_info); } +EXPORT_SYMBOL_GPL(nfs_put_super); /* * Destroy an NFS2/3 superblock */ -static void nfs_kill_super(struct super_block *s) +void nfs_kill_super(struct super_block *s) { struct nfs_server *server = NFS_SB(s); @@ -2397,130 +2684,44 @@ static void nfs_kill_super(struct super_block *s) nfs_fscache_release_super_cookie(s); nfs_free_server(server); } +EXPORT_SYMBOL_GPL(nfs_kill_super); /* - * Clone an NFS2/3 server record on xdev traversal (FSID-change) + * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) */ static struct dentry * nfs_xdev_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data) { struct nfs_clone_mount *data = raw_data; - struct 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, + struct nfs_mount_info mount_info = { + .fill_super = nfs_clone_super, + .set_security = nfs_clone_sb_security, + .cloned = data, }; - int error; + struct nfs_server *server; + struct dentry *mntroot = ERR_PTR(-ENOMEM); + struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; dprintk("--> nfs_xdev_mount()\n"); - /* 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; + mount_info.mntfh = mount_info.cloned->fh; - 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_bdi; - } - - if (!s->s_root) { - /* initial superblock/root creation */ - nfs_clone_super(s, data->sb); - nfs_fscache_get_super_cookie(s, NULL, data); - } - - 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; + /* create a new volume representation */ + server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); - /* clone any lsm security options from the parent to the new sb */ - security_sb_clone_mnt_opts(data->sb, s); + if (IS_ERR(server)) + mntroot = ERR_CAST(server); + else + mntroot = nfs_fs_mount_common(server, flags, + dev_name, &mount_info, nfs_mod); - dprintk("<-- nfs_xdev_mount() = 0\n"); + dprintk("<-- nfs_xdev_mount() = %ld\n", + IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); return mntroot; - -out_err_nosb: - nfs_free_server(server); -out_err_noserver: - dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); - return ERR_PTR(error); - -error_splat_super: - if (server && !s->s_root) - bdi_unregister(&server->backing_dev_info); -error_splat_bdi: - deactivate_locked_super(s); - dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); - return ERR_PTR(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; - /* - * 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) -{ - 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); -} +#if IS_ENABLED(CONFIG_NFS_V4) static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) { @@ -2528,43 +2729,6 @@ static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); } -static int nfs4_validate_text_mount_data(void *options, - struct nfs_parsed_mount_data *args, - const char *dev_name) -{ - struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; - - nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); - - nfs_validate_transport_protocol(args); - - nfs4_validate_mount_flags(args); - - if (args->version != 4) { - dfprintk(MOUNT, - "NFS4: Illegal mount version\n"); - return -EINVAL; - } - - if (args->auth_flavor_len > 1) { - dfprintk(MOUNT, - "NFS4: Too many RPC auth flavours specified\n"); - return -EINVAL; - } - - if (args->client_address == NULL) { - dfprintk(MOUNT, - "NFS4: mount program didn't pass callback address\n"); - return -EINVAL; - } - - return nfs_parse_devname(dev_name, - &args->nfs_server.hostname, - NFS4_MAXNAMLEN, - &args->nfs_server.export_path, - NFS4_MAXPATHLEN); -} - /* * Validate NFSv4 mount options */ @@ -2579,6 +2743,8 @@ static int nfs4_validate_mount_data(void *options, if (data == NULL) goto out_no_data; + args->version = 4; + switch (data->version) { case 1: if (data->host_addrlen > sizeof(args->nfs_server.address)) @@ -2590,15 +2756,19 @@ static int nfs4_validate_mount_data(void *options, return -EFAULT; if (!nfs_verify_server_address(sap)) goto out_no_address; + args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); if (data->auth_flavourlen) { + rpc_authflavor_t pseudoflavor; if (data->auth_flavourlen > 1) goto out_inval_auth; - if (copy_from_user(&args->auth_flavors[0], + if (copy_from_user(&pseudoflavor, data->auth_flavours, - sizeof(args->auth_flavors[0]))) + sizeof(pseudoflavor))) return -EFAULT; - } + args->selected_flavor = pseudoflavor; + } else + args->selected_flavor = RPC_AUTH_UNIX; c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); if (IS_ERR(c)) @@ -2632,16 +2802,12 @@ static int nfs4_validate_mount_data(void *options, args->acdirmax = data->acdirmax; args->nfs_server.protocol = data->proto; nfs_validate_transport_protocol(args); + if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) + goto out_invalid_transport_udp; break; default: - if (nfs_parse_mount_options((char *)options, args) == 0) - return -EINVAL; - - if (!nfs_verify_server_address(sap)) - return -EINVAL; - - return nfs4_validate_text_mount_data(options, args, dev_name); + return NFS_TEXT_DATA; } return 0; @@ -2658,535 +2824,76 @@ out_inval_auth: out_no_address: dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); return -EINVAL; + +out_invalid_transport_udp: + dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); + return -EINVAL; } /* - * Get the superblock for the NFS4 root partition + * NFS v4 module parameters need to stay in the + * NFS client for backwards compatibility */ -static struct dentry * -nfs4_remote_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *raw_data) +unsigned int nfs_callback_set_tcpport; +unsigned short nfs_callback_tcpport; +/* Default cache timeout is 10 minutes */ +unsigned int nfs_idmap_cache_timeout = 600; +/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ +bool nfs4_disable_idmapping = true; +unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; +unsigned short send_implementation_id = 1; +char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; +bool recover_lost_locks = false; + +EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); +EXPORT_SYMBOL_GPL(nfs_callback_tcpport); +EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); +EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); +EXPORT_SYMBOL_GPL(max_session_slots); +EXPORT_SYMBOL_GPL(send_implementation_id); +EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); +EXPORT_SYMBOL_GPL(recover_lost_locks); + +#define NFS_CALLBACK_MAXPORTNR (65535U) + +static int param_set_portnr(const char *val, const struct kernel_param *kp) { - struct nfs_parsed_mount_data *data = raw_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; - - mntfh = nfs_alloc_fhandle(); - if (data == NULL || mntfh == NULL) - goto out_free_fh; - - security_init_mnt_opts(&data->lsm_opts); - - /* 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(&nfs4_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_bdi; - } - - if (!s->s_root) { - /* initial superblock/root creation */ - nfs4_fill_super(s); - nfs_fscache_get_super_cookie( - s, data ? data->fscache_uniq : NULL, NULL); - } - - 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; - - security_free_mnt_opts(&data->lsm_opts); - nfs_free_fhandle(mntfh); - return mntroot; - -out: - security_free_mnt_opts(&data->lsm_opts); -out_free_fh: - nfs_free_fhandle(mntfh); - return ERR_PTR(error); - -out_free: - nfs_free_server(server); - goto out; - -error_splat_root: - dput(mntroot); -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 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) + 3; - root_devname = kmalloc(len, GFP_KERNEL); - if (root_devname == NULL) - return ERR_PTR(-ENOMEM); - snprintf(root_devname, len, "%s:/", hostname); - root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); - kfree(root_devname); - return root_mnt; -} - -static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) -{ - char *page = (char *) __get_free_page(GFP_KERNEL); - char *devname, *tmp; - - if (page == NULL) - return; - devname = nfs_path(path->mnt->mnt_devname, - path->mnt->mnt_root, path->dentry, - page, PAGE_SIZE); - if (IS_ERR(devname)) - goto out_freepage; - tmp = kstrdup(devname, GFP_KERNEL); - if (tmp == NULL) - goto out_freepage; - kfree(mnt->mnt_devname); - mnt->mnt_devname = tmp; -out_freepage: - free_page((unsigned long)page); -} - -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 int nfs_follow_remote_path(struct vfsmount *root_mnt, - const char *export_path, struct vfsmount *mnt_target) -{ - struct nameidata *nd = NULL; - struct mnt_namespace *ns_private; - struct super_block *s; + unsigned long num; int ret; - nd = kmalloc(sizeof(*nd), GFP_KERNEL); - if (nd == NULL) - return -ENOMEM; - - ns_private = create_mnt_ns(root_mnt); - ret = PTR_ERR(ns_private); - if (IS_ERR(ns_private)) - goto out_mntput; - - ret = nfs_referral_loop_protect(); - if (ret != 0) - goto out_put_mnt_ns; - - ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, - export_path, LOOKUP_FOLLOW, nd); - - nfs_referral_loop_unprotect(); - put_mnt_ns(ns_private); - - if (ret != 0) - goto out_err; - - s = nd->path.mnt->mnt_sb; - atomic_inc(&s->s_active); - mnt_target->mnt_sb = s; - mnt_target->mnt_root = dget(nd->path.dentry); - - /* Correct the device pathname */ - nfs_fix_devname(&nd->path, mnt_target); - - path_put(&nd->path); - kfree(nd); - down_write(&s->s_umount); + if (!val) + return -EINVAL; + ret = kstrtoul(val, 0, &num); + if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) + return -EINVAL; + *((unsigned int *)kp->arg) = num; return 0; -out_put_mnt_ns: - put_mnt_ns(ns_private); -out_mntput: - mntput(root_mnt); -out_err: - kfree(nd); - return ret; -} - -static int nfs4_try_mount(int flags, const char *dev_name, - struct nfs_parsed_mount_data *data, - struct vfsmount *mnt) -{ - char *export_path; - struct vfsmount *root_mnt; - int error; - - 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, data, - data->nfs_server.hostname); - data->nfs_server.export_path = export_path; - - error = PTR_ERR(root_mnt); - if (IS_ERR(root_mnt)) - goto out; - - error = nfs_follow_remote_path(root_mnt, export_path, mnt); - -out: - dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, - error != 0 ? " [error]" : ""); - return error; -} - -/* - * 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; - int error = -ENOMEM; - - data = nfs_alloc_parsed_mount_data(4); - if (data == NULL) - goto out_free_data; - - /* Validate the mount data */ - error = nfs4_validate_mount_data(raw_data, data, dev_name); - if (error < 0) - goto out; - - error = nfs4_try_mount(flags, dev_name, data, mnt); - -out: - kfree(data->client_address); - kfree(data->nfs_server.export_path); - kfree(data->nfs_server.hostname); - kfree(data->fscache_uniq); -out_free_data: - kfree(data); - dprintk("<-- nfs4_get_sb() = %d%s\n", error, - error != 0 ? " [error]" : ""); - return error; -} - -static void nfs4_kill_super(struct super_block *sb) -{ - struct nfs_server *server = NFS_SB(sb); - - dprintk("--> %s\n", __func__); - nfs_super_return_all_delegations(sb); - kill_anon_super(sb); - nfs_fscache_release_super_cookie(sb); - nfs_free_server(server); - dprintk("<-- %s\n", __func__); -} - -/* - * 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_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_mount()\n"); - - /* create a new volume representation */ - server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); - if (IS_ERR(server)) { - error = PTR_ERR(server); - goto out_err_noserver; - } - sb_mntdata.server = server; - - if (server->flags & NFS4_MOUNT_UNSHARED) - compare_super = NULL; - - /* Get a superblock - note that we may end up sharing one that already exists */ - s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); - if (IS_ERR(s)) { - error = PTR_ERR(s); - goto out_err_nosb; - } - - if (s->s_fs_info != server) { - nfs_free_server(server); - server = NULL; - } else { - error = nfs_bdi_register(server); - if (error) - goto error_splat_bdi; - } - - if (!s->s_root) { - /* initial superblock/root creation */ - nfs4_clone_super(s, data->sb); - nfs_fscache_get_super_cookie(s, NULL, data); - } - - 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; - - security_sb_clone_mnt_opts(data->sb, s); - - dprintk("<-- nfs4_xdev_mount() = 0\n"); - return mntroot; - -out_err_nosb: - nfs_free_server(server); -out_err_noserver: - dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); - return ERR_PTR(error); - -error_splat_super: - if (server && !s->s_root) - bdi_unregister(&server->backing_dev_info); -error_splat_bdi: - deactivate_locked_super(s); - dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); - return ERR_PTR(error); } +static struct kernel_param_ops param_ops_portnr = { + .set = param_set_portnr, + .get = param_get_uint, +}; +#define param_check_portnr(name, p) __param_check(name, p, unsigned int); + +module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); +module_param(nfs_idmap_cache_timeout, int, 0644); +module_param(nfs4_disable_idmapping, bool, 0644); +module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, + NFS4_CLIENT_ID_UNIQ_LEN, 0600); +MODULE_PARM_DESC(nfs4_disable_idmapping, + "Turn off NFSv4 idmapping when using 'sec=sys'"); +module_param(max_session_slots, ushort, 0644); +MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " + "requests the client will negotiate"); +module_param(send_implementation_id, ushort, 0644); +MODULE_PARM_DESC(send_implementation_id, + "Send implementation ID with NFSv4.1 exchange_id"); +MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); + +module_param(recover_lost_locks, bool, 0644); +MODULE_PARM_DESC(recover_lost_locks, + "If the server reports that a lock might be lost, " + "try to recover it risking data corruption."); -static struct dentry * -nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *raw_data) -{ - 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 = -ENOMEM; - - dprintk("--> nfs4_referral_get_sb()\n"); - - mntfh = nfs_alloc_fhandle(); - if (mntfh == NULL) - goto out_err_nofh; - - /* create a new volume representation */ - server = nfs4_create_referral_server(data, mntfh); - if (IS_ERR(server)) { - error = PTR_ERR(server); - goto out_err_noserver; - } - sb_mntdata.server = server; - - if (server->flags & NFS4_MOUNT_UNSHARED) - compare_super = NULL; - - /* Get a superblock - note that we may end up sharing one that already exists */ - s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); - if (IS_ERR(s)) { - error = PTR_ERR(s); - goto out_err_nosb; - } - - if (s->s_fs_info != server) { - nfs_free_server(server); - server = NULL; - } else { - error = nfs_bdi_register(server); - if (error) - goto error_splat_bdi; - } - - if (!s->s_root) { - /* initial superblock/root creation */ - nfs4_fill_super(s); - nfs_fscache_get_super_cookie(s, NULL, data); - } - - 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; - - security_sb_clone_mnt_opts(data->sb, s); - - nfs_free_fhandle(mntfh); - dprintk("<-- nfs4_referral_get_sb() = 0\n"); - return mntroot; - -out_err_nosb: - nfs_free_server(server); -out_err_noserver: - nfs_free_fhandle(mntfh); -out_err_nofh: - dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); - return ERR_PTR(error); - -error_splat_super: - if (server && !s->s_root) - bdi_unregister(&server->backing_dev_info); -error_splat_bdi: - deactivate_locked_super(s); - nfs_free_fhandle(mntfh); - dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); - return ERR_PTR(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; - char *export_path; - struct vfsmount *root_mnt; - int error; - - dprintk("--> nfs4_referral_get_sb()\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; - - error = PTR_ERR(root_mnt); - if (IS_ERR(root_mnt)) - goto out; - - error = nfs_follow_remote_path(root_mnt, export_path, mnt); -out: - dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, - error != 0 ? " [error]" : ""); - return error; -} #endif /* CONFIG_NFS_V4 */ |