diff options
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 1401 |
1 files changed, 1401 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c new file mode 100644 index 000000000..b3fcc27b9 --- /dev/null +++ b/fs/nfs/super.c @@ -0,0 +1,1401 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/fs/nfs/super.c + * + * Copyright (C) 1992 Rick Sladkey + * + * nfs superblock handling functions + * + * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some + * experimental NFS changes. Modularisation taken straight from SYS5 fs. + * + * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. + * J.S.Peatfield@damtp.cam.ac.uk + * + * Split from inode.c by David Howells <dhowells@redhat.com> + * + * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a + * particular server are held in the same superblock + * - NFS superblocks can have several effective roots to the dentry tree + * - directory type roots are spliced into the tree when a path from one root reaches the root + * of another (see nfs_lookup()) + */ + +#include <linux/module.h> +#include <linux/init.h> + +#include <linux/time.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/stat.h> +#include <linux/errno.h> +#include <linux/unistd.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/addr.h> +#include <linux/sunrpc/stats.h> +#include <linux/sunrpc/metrics.h> +#include <linux/sunrpc/xprtsock.h> +#include <linux/sunrpc/xprtrdma.h> +#include <linux/nfs_fs.h> +#include <linux/nfs_mount.h> +#include <linux/nfs4_mount.h> +#include <linux/lockd/bind.h> +#include <linux/seq_file.h> +#include <linux/mount.h> +#include <linux/namei.h> +#include <linux/vfs.h> +#include <linux/inet.h> +#include <linux/in6.h> +#include <linux/slab.h> +#include <net/ipv6.h> +#include <linux/netdevice.h> +#include <linux/nfs_xdr.h> +#include <linux/magic.h> +#include <linux/parser.h> +#include <linux/nsproxy.h> +#include <linux/rcupdate.h> + +#include <linux/uaccess.h> +#include <linux/nfs_ssc.h> + +#include "nfs4_fs.h" +#include "callback.h" +#include "delegation.h" +#include "iostat.h" +#include "internal.h" +#include "fscache.h" +#include "nfs4session.h" +#include "pnfs.h" +#include "nfs.h" + +#define NFSDBG_FACILITY NFSDBG_VFS + +const struct super_operations nfs_sops = { + .alloc_inode = nfs_alloc_inode, + .free_inode = nfs_free_inode, + .write_inode = nfs_write_inode, + .drop_inode = nfs_drop_inode, + .statfs = nfs_statfs, + .evict_inode = nfs_evict_inode, + .umount_begin = nfs_umount_begin, + .show_options = nfs_show_options, + .show_devname = nfs_show_devname, + .show_path = nfs_show_path, + .show_stats = nfs_show_stats, +}; +EXPORT_SYMBOL_GPL(nfs_sops); + +static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = { + .sco_sb_deactive = nfs_sb_deactive, +}; + +#if IS_ENABLED(CONFIG_NFS_V4) +static int __init register_nfs4_fs(void) +{ + return register_filesystem(&nfs4_fs_type); +} + +static void unregister_nfs4_fs(void) +{ + unregister_filesystem(&nfs4_fs_type); +} +#else +static int __init register_nfs4_fs(void) +{ + return 0; +} + +static void unregister_nfs4_fs(void) +{ +} +#endif + +static void nfs_ssc_register_ops(void) +{ + nfs_ssc_register(&nfs_ssc_clnt_ops_tbl); +} + +static void nfs_ssc_unregister_ops(void) +{ + nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl); +} + +static struct shrinker acl_shrinker = { + .count_objects = nfs_access_cache_count, + .scan_objects = nfs_access_cache_scan, + .seeks = DEFAULT_SEEKS, +}; + +/* + * Register the NFS filesystems + */ +int __init register_nfs_fs(void) +{ + int ret; + + ret = register_filesystem(&nfs_fs_type); + if (ret < 0) + goto error_0; + + ret = register_nfs4_fs(); + if (ret < 0) + goto error_1; + + ret = nfs_register_sysctl(); + if (ret < 0) + goto error_2; + ret = register_shrinker(&acl_shrinker); + if (ret < 0) + goto error_3; + nfs_ssc_register_ops(); + return 0; +error_3: + nfs_unregister_sysctl(); +error_2: + unregister_nfs4_fs(); +error_1: + unregister_filesystem(&nfs_fs_type); +error_0: + return ret; +} + +/* + * Unregister the NFS filesystems + */ +void __exit unregister_nfs_fs(void) +{ + unregister_shrinker(&acl_shrinker); + nfs_unregister_sysctl(); + unregister_nfs4_fs(); + nfs_ssc_unregister_ops(); + unregister_filesystem(&nfs_fs_type); +} + +bool nfs_sb_active(struct super_block *sb) +{ + struct nfs_server *server = NFS_SB(sb); + + if (!atomic_inc_not_zero(&sb->s_active)) + return false; + if (atomic_inc_return(&server->active) != 1) + atomic_dec(&sb->s_active); + return true; +} +EXPORT_SYMBOL_GPL(nfs_sb_active); + +void nfs_sb_deactive(struct super_block *sb) +{ + struct nfs_server *server = NFS_SB(sb); + + if (atomic_dec_and_test(&server->active)) + deactivate_super(sb); +} +EXPORT_SYMBOL_GPL(nfs_sb_deactive); + +static int __nfs_list_for_each_server(struct list_head *head, + int (*fn)(struct nfs_server *, void *), + void *data) +{ + struct nfs_server *server, *last = NULL; + int ret = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(server, head, client_link) { + if (!(server->super && nfs_sb_active(server->super))) + continue; + rcu_read_unlock(); + if (last) + nfs_sb_deactive(last->super); + last = server; + ret = fn(server, data); + if (ret) + goto out; + rcu_read_lock(); + } + rcu_read_unlock(); +out: + if (last) + nfs_sb_deactive(last->super); + return ret; +} + +int nfs_client_for_each_server(struct nfs_client *clp, + int (*fn)(struct nfs_server *, void *), + void *data) +{ + return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data); +} +EXPORT_SYMBOL_GPL(nfs_client_for_each_server); + +/* + * Deliver file system statistics to userspace + */ +int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct nfs_server *server = NFS_SB(dentry->d_sb); + unsigned char blockbits; + unsigned long blockres; + struct nfs_fh *fh = NFS_FH(d_inode(dentry)); + struct nfs_fsstat res; + int error = -ENOMEM; + + res.fattr = nfs_alloc_fattr(); + if (res.fattr == NULL) + goto out_err; + + error = server->nfs_client->rpc_ops->statfs(server, fh, &res); + if (unlikely(error == -ESTALE)) { + struct dentry *pd_dentry; + + pd_dentry = dget_parent(dentry); + nfs_zap_caches(d_inode(pd_dentry)); + dput(pd_dentry); + } + nfs_free_fattr(res.fattr); + if (error < 0) + goto out_err; + + buf->f_type = NFS_SUPER_MAGIC; + + /* + * Current versions of glibc do not correctly handle the + * case where f_frsize != f_bsize. Eventually we want to + * report the value of wtmult in this field. + */ + buf->f_frsize = dentry->d_sb->s_blocksize; + + /* + * On most *nix systems, f_blocks, f_bfree, and f_bavail + * are reported in units of f_frsize. Linux hasn't had + * an f_frsize field in its statfs struct until recently, + * thus historically Linux's sys_statfs reports these + * fields in units of f_bsize. + */ + buf->f_bsize = dentry->d_sb->s_blocksize; + blockbits = dentry->d_sb->s_blocksize_bits; + blockres = (1 << blockbits) - 1; + buf->f_blocks = (res.tbytes + blockres) >> blockbits; + buf->f_bfree = (res.fbytes + blockres) >> blockbits; + buf->f_bavail = (res.abytes + blockres) >> blockbits; + + buf->f_files = res.tfiles; + buf->f_ffree = res.afiles; + + buf->f_namelen = server->namelen; + + return 0; + + out_err: + dprintk("%s: statfs error = %d\n", __func__, -error); + return error; +} +EXPORT_SYMBOL_GPL(nfs_statfs); + +/* + * Map the security flavour number to a name + */ +static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) +{ + static const struct { + rpc_authflavor_t flavour; + const char *str; + } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { + /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ + { RPC_AUTH_NULL, "null" }, + { RPC_AUTH_UNIX, "sys" }, + { RPC_AUTH_GSS_KRB5, "krb5" }, + { RPC_AUTH_GSS_KRB5I, "krb5i" }, + { RPC_AUTH_GSS_KRB5P, "krb5p" }, + { RPC_AUTH_GSS_LKEY, "lkey" }, + { RPC_AUTH_GSS_LKEYI, "lkeyi" }, + { RPC_AUTH_GSS_LKEYP, "lkeyp" }, + { RPC_AUTH_GSS_SPKM, "spkm" }, + { RPC_AUTH_GSS_SPKMI, "spkmi" }, + { RPC_AUTH_GSS_SPKMP, "spkmp" }, + { UINT_MAX, "unknown" } + }; + int i; + + for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { + if (sec_flavours[i].flavour == flavour) + break; + } + return sec_flavours[i].str; +} + +static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, + int showdefaults) +{ + struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; + char *proto = NULL; + + switch (sap->sa_family) { + case AF_INET: + switch (nfss->mountd_protocol) { + case IPPROTO_UDP: + proto = RPCBIND_NETID_UDP; + break; + case IPPROTO_TCP: + proto = RPCBIND_NETID_TCP; + break; + } + break; + case AF_INET6: + switch (nfss->mountd_protocol) { + case IPPROTO_UDP: + proto = RPCBIND_NETID_UDP6; + break; + case IPPROTO_TCP: + proto = RPCBIND_NETID_TCP6; + break; + } + break; + } + if (proto || showdefaults) + seq_printf(m, ",mountproto=%s", proto ?: "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_puts(m, ",mountaddr=unspecified"); + } + + if (nfss->mountd_version || showdefaults) + seq_printf(m, ",mountvers=%u", nfss->mountd_version); + if ((nfss->mountd_port && + nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || + showdefaults) + seq_printf(m, ",mountport=%u", nfss->mountd_port); + + nfs_show_mountd_netid(m, nfss, showdefaults); +} + +#if IS_ENABLED(CONFIG_NFS_V4) +static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, + int showdefaults) +{ + struct nfs_client *clp = nfss->nfs_client; + + seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); +} +#else +static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, + int showdefaults) +{ +} +#endif + +static void nfs_show_nfs_version(struct seq_file *m, + unsigned int version, + unsigned int minorversion) +{ + seq_printf(m, ",vers=%u", version); + if (version == 4) + seq_printf(m, ".%u", minorversion); +} + +/* + * Describe the mount options in force on this server representation + */ +static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, + int showdefaults) +{ + static const struct proc_nfs_info { + int flag; + const char *str; + const char *nostr; + } nfs_info[] = { + { NFS_MOUNT_SOFT, ",soft", "" }, + { NFS_MOUNT_SOFTERR, ",softerr", "" }, + { NFS_MOUNT_SOFTREVAL, ",softreval", "" }, + { 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); + if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) + seq_puts(m, ",hard"); + 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 (clp->cl_nconnect > 0) + seq_printf(m, ",nconnect=%u", clp->cl_nconnect); + 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_puts(m, ",fsc"); + + if (nfss->options & NFS_OPTION_MIGRATION) + seq_puts(m, ",migration"); + + if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { + if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) + seq_puts(m, ",lookupcache=none"); + else + seq_puts(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_puts(m, ",local_lock=none"); + else if (local_flock && local_fcntl) + seq_puts(m, ",local_lock=all"); + else if (local_flock) + seq_puts(m, ",local_lock=flock"); + else + seq_puts(m, ",local_lock=posix"); +} + +/* + * Describe the mount options on this VFS mountpoint + */ +int nfs_show_options(struct seq_file *m, struct dentry *root) +{ + struct nfs_server *nfss = NFS_SB(root->d_sb); + + nfs_show_mount_options(m, nfss, 0); + + rcu_read_lock(); + seq_printf(m, ",addr=%s", + rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, + RPC_DISPLAY_ADDR)); + rcu_read_unlock(); + + return 0; +} +EXPORT_SYMBOL_GPL(nfs_show_options); + +#if IS_ENABLED(CONFIG_NFS_V4) +static void show_lease(struct seq_file *m, struct nfs_server *server) +{ + struct nfs_client *clp = server->nfs_client; + unsigned long expire; + + seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); + expire = clp->cl_last_renewal + clp->cl_lease_time; + seq_printf(m, ",lease_expired=%ld", + time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); +} +#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_puts(m, ",sessions"); +} +#else +static void show_sessions(struct seq_file *m, struct nfs_server *server) {} +#endif +#endif + +#ifdef CONFIG_NFS_V4_1 +static void show_pnfs(struct seq_file *m, struct nfs_server *server) +{ + seq_printf(m, ",pnfs="); + if (server->pnfs_curr_ld) + seq_printf(m, "%s", server->pnfs_curr_ld->name); + else + seq_printf(m, "not configured"); +} + +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) +{ + if (nfss->nfs_client && nfss->nfs_client->cl_implid) { + struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; + seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," + "date='%llu,%u'", + impl_id->name, impl_id->domain, + impl_id->date.seconds, impl_id->date.nseconds); + } +} +#else +#if IS_ENABLED(CONFIG_NFS_V4) +static void show_pnfs(struct seq_file *m, struct nfs_server *server) +{ +} +#endif +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) +{ +} +#endif + +int nfs_show_devname(struct seq_file *m, struct dentry *root) +{ + char *page = (char *) __get_free_page(GFP_KERNEL); + char *devname, *dummy; + int err = 0; + if (!page) + return -ENOMEM; + devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); + if (IS_ERR(devname)) + err = PTR_ERR(devname); + else + seq_escape(m, devname, " \t\n\\"); + free_page((unsigned long)page); + return err; +} +EXPORT_SYMBOL_GPL(nfs_show_devname); + +int nfs_show_path(struct seq_file *m, struct dentry *dentry) +{ + seq_puts(m, "/"); + return 0; +} +EXPORT_SYMBOL_GPL(nfs_show_path); + +/* + * Present statistical information for this VFS mountpoint + */ +int nfs_show_stats(struct seq_file *m, struct dentry *root) +{ + int i, cpu; + struct nfs_server *nfss = NFS_SB(root->d_sb); + struct rpc_auth *auth = nfss->client->cl_auth; + struct nfs_iostats totals = { }; + + seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); + + /* + * Display all mount option settings + */ + seq_puts(m, "\n\topts:\t"); + seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); + seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); + seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); + seq_puts(m, root->d_sb->s_flags & SB_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_puts(m, "\n\tcaps:\t"); + seq_printf(m, "caps=0x%x", nfss->caps); + seq_printf(m, ",wtmult=%u", nfss->wtmult); + seq_printf(m, ",dtsize=%u", nfss->dtsize); + seq_printf(m, ",bsize=%u", nfss->bsize); + seq_printf(m, ",namlen=%u", nfss->namelen); + +#if IS_ENABLED(CONFIG_NFS_V4) + if (nfss->nfs_client->rpc_ops->version == 4) { + seq_puts(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); + show_lease(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_puts(m, "\n\tevents:\t"); + for (i = 0; i < __NFSIOS_COUNTSMAX; i++) + seq_printf(m, "%lu ", totals.events[i]); + seq_puts(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_puts(m, "\n\tfsc:\t"); + for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) + seq_printf(m, "%Lu ", totals.fscache[i]); + } +#endif + seq_putc(m, '\n'); + + rpc_clnt_show_stats(m, nfss->client); + + return 0; +} +EXPORT_SYMBOL_GPL(nfs_show_stats); + +/* + * Begin unmount by attempting to remove all automounted mountpoints we added + * in response to xdev traversals and referrals + */ +void nfs_umount_begin(struct super_block *sb) +{ + struct nfs_server *server; + struct rpc_clnt *rpc; + + server = NFS_SB(sb); + /* -EIO all pending I/O */ + rpc = server->client_acl; + if (!IS_ERR(rpc)) + rpc_killall_tasks(rpc); + rpc = server->client; + if (!IS_ERR(rpc)) + rpc_killall_tasks(rpc); +} +EXPORT_SYMBOL_GPL(nfs_umount_begin); + +/* + * 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); + +/* + * Ensure that a specified authtype in ctx->auth_info is supported by + * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and + * -EACCES if not. + */ +static int nfs_verify_authflavors(struct nfs_fs_context *ctx, + rpc_authflavor_t *server_authlist, + unsigned int count) +{ + rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; + bool found_auth_null = false; + unsigned int i; + + /* + * If the sec= mount option is used, the specified flavor or AUTH_NULL + * must be in the list returned by the server. + * + * AUTH_NULL has a special meaning when it's in the server list - it + * means that the server will ignore the rpc creds, so any flavor + * can be used but still use the sec= that was specified. + * + * Note also that the MNT procedure in MNTv1 does not return a list + * of supported security flavors. In this case, nfs_mount() fabricates + * a security flavor list containing just AUTH_NULL. + */ + for (i = 0; i < count; i++) { + flavor = server_authlist[i]; + + if (nfs_auth_info_match(&ctx->auth_info, flavor)) + goto out; + + if (flavor == RPC_AUTH_NULL) + found_auth_null = true; + } + + if (found_auth_null) { + flavor = ctx->auth_info.flavors[0]; + goto out; + } + + dfprintk(MOUNT, + "NFS: specified auth flavors not supported by server\n"); + return -EACCES; + +out: + ctx->selected_flavor = flavor; + dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor); + return 0; +} + +/* + * Use the remote server's MOUNT service to request the NFS file handle + * corresponding to the provided path. + */ +static int nfs_request_mount(struct fs_context *fc, + struct nfs_fh *root_fh, + rpc_authflavor_t *server_authlist, + unsigned int *server_authlist_len) +{ + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct nfs_mount_request request = { + .sap = (struct sockaddr *) + &ctx->mount_server.address, + .dirpath = ctx->nfs_server.export_path, + .protocol = ctx->mount_server.protocol, + .fh = root_fh, + .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, + .auth_flav_len = server_authlist_len, + .auth_flavs = server_authlist, + .net = fc->net_ns, + }; + int status; + + if (ctx->mount_server.version == 0) { + switch (ctx->version) { + default: + ctx->mount_server.version = NFS_MNT3_VERSION; + break; + case 2: + ctx->mount_server.version = NFS_MNT_VERSION; + } + } + request.version = ctx->mount_server.version; + + if (ctx->mount_server.hostname) + request.hostname = ctx->mount_server.hostname; + else + request.hostname = ctx->nfs_server.hostname; + + /* + * Construct the mount server's address. + */ + if (ctx->mount_server.address.sa_family == AF_UNSPEC) { + memcpy(request.sap, &ctx->nfs_server.address, + ctx->nfs_server.addrlen); + ctx->mount_server.addrlen = ctx->nfs_server.addrlen; + } + request.salen = ctx->mount_server.addrlen; + nfs_set_port(request.sap, &ctx->mount_server.port, 0); + + /* + * Now ask the mount server to map our export path + * to a file handle. + */ + status = nfs_mount(&request); + if (status != 0) { + dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", + request.hostname, status); + return status; + } + + return 0; +} + +static struct nfs_server *nfs_try_mount_request(struct fs_context *fc) +{ + struct nfs_fs_context *ctx = nfs_fc2context(fc); + int status; + unsigned int i; + bool tried_auth_unix = false; + bool auth_null_in_list = false; + struct nfs_server *server = ERR_PTR(-EACCES); + rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; + unsigned int authlist_len = ARRAY_SIZE(authlist); + + status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len); + if (status) + return ERR_PTR(status); + + /* + * Was a sec= authflavor specified in the options? First, verify + * whether the server supports it, and then just try to use it if so. + */ + if (ctx->auth_info.flavor_len > 0) { + status = nfs_verify_authflavors(ctx, authlist, authlist_len); + dfprintk(MOUNT, "NFS: using auth flavor %u\n", + ctx->selected_flavor); + if (status) + return ERR_PTR(status); + return ctx->nfs_mod->rpc_ops->create_server(fc); + } + + /* + * 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; + break; + } + dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); + ctx->selected_flavor = flavor; + server = ctx->nfs_mod->rpc_ops->create_server(fc); + if (!IS_ERR(server)) + return server; + } + + /* + * Nothing we tried so far worked. At this point, give up if we've + * already tried AUTH_UNIX or if the server's list doesn't contain + * AUTH_NULL + */ + if (tried_auth_unix || !auth_null_in_list) + return server; + + /* Last chance! Try AUTH_UNIX */ + dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); + ctx->selected_flavor = RPC_AUTH_UNIX; + return ctx->nfs_mod->rpc_ops->create_server(fc); +} + +int nfs_try_get_tree(struct fs_context *fc) +{ + struct nfs_fs_context *ctx = nfs_fc2context(fc); + + if (ctx->need_mount) + ctx->server = nfs_try_mount_request(fc); + else + ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); + + return nfs_get_tree_common(fc); +} +EXPORT_SYMBOL_GPL(nfs_try_get_tree); + + +#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ + | NFS_MOUNT_SECURE \ + | NFS_MOUNT_TCP \ + | NFS_MOUNT_VER3 \ + | NFS_MOUNT_KERBEROS \ + | NFS_MOUNT_NONLM \ + | NFS_MOUNT_BROKEN_SUID \ + | NFS_MOUNT_STRICTLOCK \ + | NFS_MOUNT_LEGACY_INTERFACE) + +#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ + ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) + +static int +nfs_compare_remount_data(struct nfs_server *nfss, + struct nfs_fs_context *ctx) +{ + if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || + ctx->rsize != nfss->rsize || + ctx->wsize != nfss->wsize || + ctx->version != nfss->nfs_client->rpc_ops->version || + ctx->minorversion != nfss->nfs_client->cl_minorversion || + ctx->retrans != nfss->client->cl_timeout->to_retries || + !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || + ctx->acregmin != nfss->acregmin / HZ || + ctx->acregmax != nfss->acregmax / HZ || + ctx->acdirmin != nfss->acdirmin / HZ || + ctx->acdirmax != nfss->acdirmax / HZ || + ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || + (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || + ctx->nfs_server.port != nfss->port || + ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || + !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address, + (struct sockaddr *)&nfss->nfs_client->cl_addr)) + return -EINVAL; + + return 0; +} + +int nfs_reconfigure(struct fs_context *fc) +{ + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct super_block *sb = fc->root->d_sb; + struct nfs_server *nfss = sb->s_fs_info; + + sync_filesystem(sb); + + /* + * Userspace mount programs that send binary options generally send + * them populated with default values. We have no way to know which + * ones were explicitly specified. Fall back to legacy behavior and + * just return success. + */ + if (ctx->skip_reconfig_option_check) + return 0; + + /* + * noac is a special case. It implies -o sync, but that's not + * necessarily reflected in the mtab options. reconfigure_super + * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the + * remount options, so we have to explicitly reset it. + */ + if (ctx->flags & NFS_MOUNT_NOAC) { + fc->sb_flags |= SB_SYNCHRONOUS; + fc->sb_flags_mask |= SB_SYNCHRONOUS; + } + + /* compare new mount options with old ones */ + return nfs_compare_remount_data(nfss, ctx); +} +EXPORT_SYMBOL_GPL(nfs_reconfigure); + +/* + * Finish setting up an NFS superblock + */ +static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) +{ + struct nfs_server *server = NFS_SB(sb); + + sb->s_blocksize_bits = 0; + sb->s_blocksize = 0; + sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; + sb->s_op = server->nfs_client->cl_nfs_mod->sops; + if (ctx && ctx->bsize) + sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits); + + switch (server->nfs_client->rpc_ops->version) { + case 2: + sb->s_time_gran = 1000; + sb->s_time_min = 0; + sb->s_time_max = U32_MAX; + break; + case 3: + /* + * The VFS shouldn't apply the umask to mode bits. + * We will do so ourselves when necessary. + */ + sb->s_flags |= SB_POSIXACL; + sb->s_time_gran = 1; + sb->s_time_min = 0; + sb->s_time_max = U32_MAX; + sb->s_export_op = &nfs_export_ops; + break; + case 4: + sb->s_flags |= SB_POSIXACL; + sb->s_time_gran = 1; + sb->s_time_min = S64_MIN; + sb->s_time_max = S64_MAX; + if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) + sb->s_export_op = &nfs_export_ops; + break; + } + + 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); + + nfs_super_set_maxbytes(sb, server->maxfilesize); +} + +static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, + const struct fs_context *fc) +{ + 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_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) + goto Ebusy; + if (a->nfs_client != b->nfs_client) + goto Ebusy; + if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) + goto Ebusy; + if (a->wsize != b->wsize) + goto Ebusy; + if (a->rsize != b->rsize) + goto Ebusy; + if (a->acregmin != b->acregmin) + goto Ebusy; + if (a->acregmax != b->acregmax) + goto Ebusy; + if (a->acdirmin != b->acdirmin) + goto Ebusy; + if (a->acdirmax != b->acdirmax) + goto Ebusy; + if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) + goto Ebusy; + return 1; +Ebusy: + return 0; +} + +static int nfs_set_super(struct super_block *s, struct fs_context *fc) +{ + struct nfs_server *server = fc->s_fs_info; + int ret; + + s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; + ret = set_anon_super(s, server); + if (ret == 0) + server->s_dev = s->s_dev; + return ret; +} + +static int nfs_compare_super_address(struct nfs_server *server1, + struct nfs_server *server2) +{ + struct sockaddr *sap1, *sap2; + struct rpc_xprt *xprt1 = server1->client->cl_xprt; + struct rpc_xprt *xprt2 = server2->client->cl_xprt; + + if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) + return 0; + + sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; + sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; + + if (sap1->sa_family != sap2->sa_family) + return 0; + + switch (sap1->sa_family) { + case AF_INET: { + struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; + struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; + if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) + return 0; + if (sin1->sin_port != sin2->sin_port) + return 0; + break; + } + case AF_INET6: { + struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; + struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; + if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) + return 0; + if (sin1->sin6_port != sin2->sin6_port) + return 0; + break; + } + default: + return 0; + } + + return 1; +} + +static int nfs_compare_userns(const struct nfs_server *old, + const struct nfs_server *new) +{ + const struct user_namespace *oldns = &init_user_ns; + const struct user_namespace *newns = &init_user_ns; + + if (old->client && old->client->cl_cred) + oldns = old->client->cl_cred->user_ns; + if (new->client && new->client->cl_cred) + newns = new->client->cl_cred->user_ns; + if (oldns != newns) + return 0; + return 1; +} + +static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) +{ + struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); + + 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; + if (!nfs_compare_userns(old, server)) + return 0; + return nfs_compare_mount_options(sb, server, fc); +} + +#ifdef CONFIG_NFS_FSCACHE +static void nfs_get_cache_cookie(struct super_block *sb, + struct nfs_fs_context *ctx) +{ + struct nfs_server *nfss = NFS_SB(sb); + char *uniq = NULL; + int ulen = 0; + + nfss->fscache_key = NULL; + nfss->fscache = NULL; + + if (!ctx) + return; + + if (ctx->clone_data.sb) { + struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.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 { + if (!(ctx->options & NFS_OPTION_FSCACHE)) + return; + if (ctx->fscache_uniq) { + uniq = ctx->fscache_uniq; + ulen = strlen(ctx->fscache_uniq); + } + } + + nfs_fscache_get_super_cookie(sb, uniq, ulen); +} +#else +static void nfs_get_cache_cookie(struct super_block *sb, + struct nfs_fs_context *ctx) +{ +} +#endif + +int nfs_get_tree_common(struct fs_context *fc) +{ + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct super_block *s; + int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; + struct nfs_server *server = ctx->server; + int error; + + ctx->server = NULL; + if (IS_ERR(server)) + return PTR_ERR(server); + + if (server->flags & NFS_MOUNT_UNSHARED) + compare_super = NULL; + + /* -o noac implies -o sync */ + if (server->flags & NFS_MOUNT_NOAC) + fc->sb_flags |= SB_SYNCHRONOUS; + + if (ctx->clone_data.sb) + if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) + fc->sb_flags |= SB_SYNCHRONOUS; + + if (server->caps & NFS_CAP_SECURITY_LABEL) + fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS; + + /* Get a superblock - note that we may end up sharing one that already exists */ + fc->s_fs_info = server; + s = sget_fc(fc, compare_super, nfs_set_super); + fc->s_fs_info = NULL; + if (IS_ERR(s)) { + error = PTR_ERR(s); + nfs_errorf(fc, "NFS: Couldn't get superblock"); + goto out_err_nosb; + } + + if (s->s_fs_info != server) { + nfs_free_server(server); + server = NULL; + } else { + error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), + MINOR(server->s_dev)); + if (error) + goto error_splat_super; + s->s_bdi->io_pages = server->rpages; + server->super = s; + } + + if (!s->s_root) { + unsigned bsize = ctx->clone_data.inherited_bsize; + /* initial superblock/root creation */ + nfs_fill_super(s, ctx); + if (bsize) { + s->s_blocksize_bits = bsize; + s->s_blocksize = 1U << bsize; + } + nfs_get_cache_cookie(s, ctx); + } + + error = nfs_get_root(s, fc); + if (error < 0) { + nfs_errorf(fc, "NFS: Couldn't get root dentry"); + goto error_splat_super; + } + + s->s_flags |= SB_ACTIVE; + error = 0; + +out: + return error; + +out_err_nosb: + nfs_free_server(server); + goto out; +error_splat_super: + deactivate_locked_super(s); + goto out; +} + +/* + * Destroy an NFS2/3 superblock + */ +void nfs_kill_super(struct super_block *s) +{ + struct nfs_server *server = NFS_SB(s); + dev_t dev = s->s_dev; + + generic_shutdown_super(s); + + nfs_fscache_release_super_cookie(s); + + nfs_free_server(server); + free_anon_bdev(dev); +} +EXPORT_SYMBOL_GPL(nfs_kill_super); + +#if IS_ENABLED(CONFIG_NFS_V4) + +/* + * NFS v4 module parameters need to stay in the + * NFS client for backwards compatibility + */ +unsigned int nfs_callback_set_tcpport; +unsigned short nfs_callback_nr_threads; +/* 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 max_session_cb_slots = NFS4_DEF_CB_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_nr_threads); +EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); +EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); +EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); +EXPORT_SYMBOL_GPL(max_session_slots); +EXPORT_SYMBOL_GPL(max_session_cb_slots); +EXPORT_SYMBOL_GPL(send_implementation_id); +EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); +EXPORT_SYMBOL_GPL(recover_lost_locks); + +#define NFS_CALLBACK_MAXPORTNR (65535U) + +static int param_set_portnr(const char *val, const struct kernel_param *kp) +{ + unsigned long num; + int ret; + + if (!val) + return -EINVAL; + ret = kstrtoul(val, 0, &num); + if (ret || num > NFS_CALLBACK_MAXPORTNR) + return -EINVAL; + *((unsigned int *)kp->arg) = num; + return 0; +} +static const struct kernel_param_ops param_ops_portnr = { + .set = param_set_portnr, + .get = param_get_uint, +}; +#define param_check_portnr(name, p) __param_check(name, p, unsigned int); + +module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); +module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); +MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " + "assigned to the NFSv4 callback channels."); +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(max_session_cb_slots, ushort, 0644); +MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " + "callbacks the client will process for a given server"); +module_param(send_implementation_id, ushort, 0644); +MODULE_PARM_DESC(send_implementation_id, + "Send implementation ID with NFSv4.1 exchange_id"); +MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); + +module_param(recover_lost_locks, bool, 0644); +MODULE_PARM_DESC(recover_lost_locks, + "If the server reports that a lock might be lost, " + "try to recover it risking data corruption."); + + +#endif /* CONFIG_NFS_V4 */ |