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OpenCloudOS-Kernel/fs/nfs/super.c

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/*
* linux/fs/nfs/super.c
*
* Copyright (C) 1992 Rick Sladkey
*
* nfs superblock handling functions
*
* Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
* experimental NFS changes. Modularisation taken straight from SYS5 fs.
*
* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
* J.S.Peatfield@damtp.cam.ac.uk
*
* Split from inode.c by David Howells <dhowells@redhat.com>
*
* - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
* particular server are held in the same superblock
* - NFS superblocks can have several effective roots to the dentry tree
* - directory type roots are spliced into the tree when a path from one root reaches the root
* of another (see nfs_lookup())
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/metrics.h>
#include <linux/sunrpc/xprtsock.h>
#include <linux/sunrpc/xprtrdma.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/smp_lock.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
#include <linux/in6.h>
#include <net/ipv6.h>
#include <linux/nfs_xdr.h>
#include <linux/magic.h>
#include <linux/parser.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_VFS
enum {
/* Mount options that take no arguments */
Opt_soft, Opt_hard,
Opt_posix, Opt_noposix,
Opt_cto, Opt_nocto,
Opt_ac, Opt_noac,
Opt_lock, Opt_nolock,
Opt_v2, Opt_v3,
Opt_udp, Opt_tcp, Opt_rdma,
Opt_acl, Opt_noacl,
Opt_rdirplus, Opt_nordirplus,
Opt_sharecache, Opt_nosharecache,
/* Mount options that take integer arguments */
Opt_port,
Opt_rsize, Opt_wsize, Opt_bsize,
Opt_timeo, Opt_retrans,
Opt_acregmin, Opt_acregmax,
Opt_acdirmin, Opt_acdirmax,
Opt_actimeo,
Opt_namelen,
Opt_mountport,
Opt_mountvers,
Opt_nfsvers,
/* Mount options that take string arguments */
Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
Opt_addr, Opt_mountaddr, Opt_clientaddr,
/* Mount options that are ignored */
Opt_userspace, Opt_deprecated,
Opt_err
};
static match_table_t nfs_mount_option_tokens = {
{ Opt_userspace, "bg" },
{ Opt_userspace, "fg" },
{ Opt_userspace, "retry=%s" },
{ Opt_soft, "soft" },
{ Opt_hard, "hard" },
{ Opt_deprecated, "intr" },
{ Opt_deprecated, "nointr" },
{ Opt_posix, "posix" },
{ Opt_noposix, "noposix" },
{ Opt_cto, "cto" },
{ Opt_nocto, "nocto" },
{ Opt_ac, "ac" },
{ Opt_noac, "noac" },
{ Opt_lock, "lock" },
{ Opt_nolock, "nolock" },
{ Opt_v2, "v2" },
{ Opt_v3, "v3" },
{ Opt_udp, "udp" },
{ Opt_tcp, "tcp" },
{ Opt_rdma, "rdma" },
{ Opt_acl, "acl" },
{ Opt_noacl, "noacl" },
{ Opt_rdirplus, "rdirplus" },
{ Opt_nordirplus, "nordirplus" },
{ Opt_sharecache, "sharecache" },
{ Opt_nosharecache, "nosharecache" },
{ Opt_port, "port=%u" },
{ Opt_rsize, "rsize=%u" },
{ Opt_wsize, "wsize=%u" },
{ Opt_bsize, "bsize=%u" },
{ Opt_timeo, "timeo=%u" },
{ Opt_retrans, "retrans=%u" },
{ Opt_acregmin, "acregmin=%u" },
{ Opt_acregmax, "acregmax=%u" },
{ Opt_acdirmin, "acdirmin=%u" },
{ Opt_acdirmax, "acdirmax=%u" },
{ Opt_actimeo, "actimeo=%u" },
{ Opt_namelen, "namlen=%u" },
{ Opt_mountport, "mountport=%u" },
{ Opt_mountvers, "mountvers=%u" },
{ Opt_nfsvers, "nfsvers=%u" },
{ Opt_nfsvers, "vers=%u" },
{ Opt_sec, "sec=%s" },
{ Opt_proto, "proto=%s" },
{ Opt_mountproto, "mountproto=%s" },
{ Opt_addr, "addr=%s" },
{ Opt_clientaddr, "clientaddr=%s" },
{ Opt_mounthost, "mounthost=%s" },
{ Opt_mountaddr, "mountaddr=%s" },
{ Opt_err, NULL }
};
enum {
Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
Opt_xprt_err
};
static match_table_t nfs_xprt_protocol_tokens = {
{ Opt_xprt_udp, "udp" },
{ Opt_xprt_tcp, "tcp" },
{ Opt_xprt_rdma, "rdma" },
{ Opt_xprt_err, NULL }
};
enum {
Opt_sec_none, Opt_sec_sys,
Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
Opt_sec_err
};
static match_table_t nfs_secflavor_tokens = {
{ Opt_sec_none, "none" },
{ Opt_sec_none, "null" },
{ Opt_sec_sys, "sys" },
{ Opt_sec_krb5, "krb5" },
{ Opt_sec_krb5i, "krb5i" },
{ Opt_sec_krb5p, "krb5p" },
{ Opt_sec_lkey, "lkey" },
{ Opt_sec_lkeyi, "lkeyi" },
{ Opt_sec_lkeyp, "lkeyp" },
{ Opt_sec_spkm, "spkm3" },
{ Opt_sec_spkmi, "spkm3i" },
{ Opt_sec_spkmp, "spkm3p" },
{ Opt_sec_err, NULL }
};
static void nfs_umount_begin(struct super_block *);
static int nfs_statfs(struct dentry *, struct kstatfs *);
static int nfs_show_options(struct seq_file *, struct vfsmount *);
static int nfs_show_stats(struct seq_file *, struct vfsmount *);
static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
static int nfs_xdev_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static void nfs_kill_super(struct super_block *);
static void nfs_put_super(struct super_block *);
static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
static struct file_system_type nfs_fs_type = {
.owner = THIS_MODULE,
.name = "nfs",
.get_sb = nfs_get_sb,
.kill_sb = nfs_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
struct file_system_type nfs_xdev_fs_type = {
.owner = THIS_MODULE,
.name = "nfs",
.get_sb = nfs_xdev_get_sb,
.kill_sb = nfs_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
static const struct super_operations nfs_sops = {
.alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode,
.write_inode = nfs_write_inode,
.put_super = nfs_put_super,
.statfs = nfs_statfs,
.clear_inode = nfs_clear_inode,
.umount_begin = nfs_umount_begin,
.show_options = nfs_show_options,
.show_stats = nfs_show_stats,
.remount_fs = nfs_remount,
};
#ifdef CONFIG_NFS_V4
static int nfs4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static int nfs4_referral_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static void nfs4_kill_super(struct super_block *sb);
static struct file_system_type nfs4_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
.get_sb = nfs4_get_sb,
.kill_sb = nfs4_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
struct file_system_type nfs4_xdev_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
.get_sb = nfs4_xdev_get_sb,
.kill_sb = nfs4_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
struct file_system_type nfs4_referral_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
.get_sb = nfs4_referral_get_sb,
.kill_sb = nfs4_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
static const struct super_operations nfs4_sops = {
.alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode,
.write_inode = nfs_write_inode,
.statfs = nfs_statfs,
.clear_inode = nfs4_clear_inode,
.umount_begin = nfs_umount_begin,
.show_options = nfs_show_options,
.show_stats = nfs_show_stats,
.remount_fs = nfs_remount,
};
#endif
static struct shrinker acl_shrinker = {
.shrink = nfs_access_cache_shrinker,
.seeks = DEFAULT_SEEKS,
};
/*
* Register the NFS filesystems
*/
int __init register_nfs_fs(void)
{
int ret;
ret = register_filesystem(&nfs_fs_type);
if (ret < 0)
goto error_0;
ret = nfs_register_sysctl();
if (ret < 0)
goto error_1;
#ifdef CONFIG_NFS_V4
ret = register_filesystem(&nfs4_fs_type);
if (ret < 0)
goto error_2;
#endif
register_shrinker(&acl_shrinker);
return 0;
#ifdef CONFIG_NFS_V4
error_2:
nfs_unregister_sysctl();
#endif
error_1:
unregister_filesystem(&nfs_fs_type);
error_0:
return ret;
}
/*
* Unregister the NFS filesystems
*/
void __exit unregister_nfs_fs(void)
{
unregister_shrinker(&acl_shrinker);
#ifdef CONFIG_NFS_V4
unregister_filesystem(&nfs4_fs_type);
#endif
nfs_unregister_sysctl();
unregister_filesystem(&nfs_fs_type);
}
void nfs_sb_active(struct nfs_server *server)
{
atomic_inc(&server->active);
}
void nfs_sb_deactive(struct nfs_server *server)
{
if (atomic_dec_and_test(&server->active))
wake_up(&server->active_wq);
}
static void nfs_put_super(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
/*
* Make sure there are no outstanding ops to this server.
* If so, wait for them to finish before allowing the
* unmount to continue.
*/
wait_event(server->active_wq, atomic_read(&server->active) == 0);
}
/*
* Deliver file system statistics to userspace
*/
static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct nfs_server *server = NFS_SB(dentry->d_sb);
unsigned char blockbits;
unsigned long blockres;
struct nfs_fh *fh = NFS_FH(dentry->d_inode);
struct nfs_fattr fattr;
struct nfs_fsstat res = {
.fattr = &fattr,
};
int error;
lock_kernel();
error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
if (error < 0)
goto out_err;
buf->f_type = NFS_SUPER_MAGIC;
/*
* Current versions of glibc do not correctly handle the
* case where f_frsize != f_bsize. Eventually we want to
* report the value of wtmult in this field.
*/
buf->f_frsize = dentry->d_sb->s_blocksize;
/*
* On most *nix systems, f_blocks, f_bfree, and f_bavail
* are reported in units of f_frsize. Linux hasn't had
* an f_frsize field in its statfs struct until recently,
* thus historically Linux's sys_statfs reports these
* fields in units of f_bsize.
*/
buf->f_bsize = dentry->d_sb->s_blocksize;
blockbits = dentry->d_sb->s_blocksize_bits;
blockres = (1 << blockbits) - 1;
buf->f_blocks = (res.tbytes + blockres) >> blockbits;
buf->f_bfree = (res.fbytes + blockres) >> blockbits;
buf->f_bavail = (res.abytes + blockres) >> blockbits;
buf->f_files = res.tfiles;
buf->f_ffree = res.afiles;
buf->f_namelen = server->namelen;
unlock_kernel();
return 0;
out_err:
dprintk("%s: statfs error = %d\n", __func__, -error);
unlock_kernel();
return error;
}
/*
* Map the security flavour number to a name
*/
static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
{
static const struct {
rpc_authflavor_t flavour;
const char *str;
} sec_flavours[] = {
{ RPC_AUTH_NULL, "null" },
{ RPC_AUTH_UNIX, "sys" },
{ RPC_AUTH_GSS_KRB5, "krb5" },
{ RPC_AUTH_GSS_KRB5I, "krb5i" },
{ RPC_AUTH_GSS_KRB5P, "krb5p" },
{ RPC_AUTH_GSS_LKEY, "lkey" },
{ RPC_AUTH_GSS_LKEYI, "lkeyi" },
{ RPC_AUTH_GSS_LKEYP, "lkeyp" },
{ RPC_AUTH_GSS_SPKM, "spkm" },
{ RPC_AUTH_GSS_SPKMI, "spkmi" },
{ RPC_AUTH_GSS_SPKMP, "spkmp" },
{ UINT_MAX, "unknown" }
};
int i;
for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
if (sec_flavours[i].flavour == flavour)
break;
}
return sec_flavours[i].str;
}
static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
int showdefaults)
{
struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
switch (sap->sa_family) {
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *)sap;
seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
NIPQUAD(sin->sin_addr.s_addr));
break;
}
case AF_INET6: {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
seq_printf(m, ",mountaddr=" NIP6_FMT,
NIP6(sin6->sin6_addr));
break;
}
default:
if (showdefaults)
seq_printf(m, ",mountaddr=unspecified");
}
if (nfss->mountd_version || showdefaults)
seq_printf(m, ",mountvers=%u", nfss->mountd_version);
if (nfss->mountd_port || showdefaults)
seq_printf(m, ",mountport=%u", nfss->mountd_port);
switch (nfss->mountd_protocol) {
case IPPROTO_UDP:
seq_printf(m, ",mountproto=udp");
break;
case IPPROTO_TCP:
seq_printf(m, ",mountproto=tcp");
break;
default:
if (showdefaults)
seq_printf(m, ",mountproto=auto");
}
}
/*
* Describe the mount options in force on this server representation
*/
static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
int showdefaults)
{
static const struct proc_nfs_info {
int flag;
const char *str;
const char *nostr;
} nfs_info[] = {
{ NFS_MOUNT_SOFT, ",soft", ",hard" },
{ NFS_MOUNT_INTR, ",intr", ",nointr" },
{ NFS_MOUNT_POSIX, ",posix", "" },
{ NFS_MOUNT_NOCTO, ",nocto", "" },
{ NFS_MOUNT_NOAC, ",noac", "" },
{ NFS_MOUNT_NONLM, ",nolock", "" },
{ NFS_MOUNT_NOACL, ",noacl", "" },
{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
{ NFS_MOUNT_UNSHARED, ",nosharecache", ""},
{ 0, NULL, NULL }
};
const struct proc_nfs_info *nfs_infop;
struct nfs_client *clp = nfss->nfs_client;
u32 version = clp->rpc_ops->version;
seq_printf(m, ",vers=%u", version);
seq_printf(m, ",rsize=%u", nfss->rsize);
seq_printf(m, ",wsize=%u", nfss->wsize);
if (nfss->bsize != 0)
seq_printf(m, ",bsize=%u", nfss->bsize);
seq_printf(m, ",namlen=%u", nfss->namelen);
if (nfss->acregmin != 3*HZ || showdefaults)
seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
if (nfss->acregmax != 60*HZ || showdefaults)
seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
if (nfss->acdirmin != 30*HZ || showdefaults)
seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
if (nfss->acdirmax != 60*HZ || showdefaults)
seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
if (nfss->flags & nfs_infop->flag)
seq_puts(m, nfs_infop->str);
else
seq_puts(m, nfs_infop->nostr);
}
seq_printf(m, ",proto=%s",
rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
if (version == 4) {
if (nfss->port != NFS_PORT)
seq_printf(m, ",port=%u", nfss->port);
} else
if (nfss->port)
seq_printf(m, ",port=%u", nfss->port);
seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
if (version != 4)
nfs_show_mountd_options(m, nfss, showdefaults);
#ifdef CONFIG_NFS_V4
if (clp->rpc_ops->version == 4)
seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
#endif
}
/*
* Describe the mount options on this VFS mountpoint
*/
static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
{
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
nfs_show_mount_options(m, nfss, 0);
seq_printf(m, ",addr=%s",
rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
RPC_DISPLAY_ADDR));
return 0;
}
/*
* Present statistical information for this VFS mountpoint
*/
static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
{
int i, cpu;
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
struct rpc_auth *auth = nfss->client->cl_auth;
struct nfs_iostats totals = { };
seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
/*
* Display all mount option settings
*/
seq_printf(m, "\n\topts:\t");
seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
nfs_show_mount_options(m, nfss, 1);
seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
seq_printf(m, "\n\tcaps:\t");
seq_printf(m, "caps=0x%x", nfss->caps);
seq_printf(m, ",wtmult=%u", nfss->wtmult);
seq_printf(m, ",dtsize=%u", nfss->dtsize);
seq_printf(m, ",bsize=%u", nfss->bsize);
seq_printf(m, ",namlen=%u", nfss->namelen);
#ifdef CONFIG_NFS_V4
if (nfss->nfs_client->rpc_ops->version == 4) {
seq_printf(m, "\n\tnfsv4:\t");
seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
}
#endif
/*
* Display security flavor in effect for this mount
*/
seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
if (auth->au_flavor)
seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
/*
* Display superblock I/O counters
*/
for_each_possible_cpu(cpu) {
struct nfs_iostats *stats;
preempt_disable();
stats = per_cpu_ptr(nfss->io_stats, cpu);
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
totals.events[i] += stats->events[i];
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
totals.bytes[i] += stats->bytes[i];
preempt_enable();
}
seq_printf(m, "\n\tevents:\t");
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
seq_printf(m, "%lu ", totals.events[i]);
seq_printf(m, "\n\tbytes:\t");
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
seq_printf(m, "%Lu ", totals.bytes[i]);
seq_printf(m, "\n");
rpc_print_iostats(m, nfss->client);
return 0;
}
/*
* Begin unmount by attempting to remove all automounted mountpoints we added
* in response to xdev traversals and referrals
*/
static void nfs_umount_begin(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
struct rpc_clnt *rpc;
/* -EIO all pending I/O */
rpc = server->client_acl;
if (!IS_ERR(rpc))
rpc_killall_tasks(rpc);
rpc = server->client;
if (!IS_ERR(rpc))
rpc_killall_tasks(rpc);
}
/*
* Set the port number in an address. Be agnostic about the address family.
*/
static void nfs_set_port(struct sockaddr *sap, unsigned short port)
{
switch (sap->sa_family) {
case AF_INET: {
struct sockaddr_in *ap = (struct sockaddr_in *)sap;
ap->sin_port = htons(port);
break;
}
case AF_INET6: {
struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
ap->sin6_port = htons(port);
break;
}
}
}
/*
* Sanity-check a server address provided by the mount command.
*
* Address family must be initialized, and address must not be
* the ANY address for that family.
*/
static int nfs_verify_server_address(struct sockaddr *addr)
{
switch (addr->sa_family) {
case AF_INET: {
struct sockaddr_in *sa = (struct sockaddr_in *)addr;
return sa->sin_addr.s_addr != htonl(INADDR_ANY);
}
case AF_INET6: {
struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
return !ipv6_addr_any(sa);
}
}
return 0;
}
/*
* Parse string addresses passed in via a mount option,
* and construct a sockaddr based on the result.
*
* If address parsing fails, set the sockaddr's address
* family to AF_UNSPEC to force nfs_verify_server_address()
* to punt the mount.
*/
static void nfs_parse_server_address(char *value,
struct sockaddr *sap,
size_t *len)
{
if (strchr(value, ':')) {
struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
ap->sin6_family = AF_INET6;
*len = sizeof(*ap);
if (in6_pton(value, -1, addr, '\0', NULL))
return;
} else {
struct sockaddr_in *ap = (struct sockaddr_in *)sap;
u8 *addr = (u8 *)&ap->sin_addr.s_addr;
ap->sin_family = AF_INET;
*len = sizeof(*ap);
if (in4_pton(value, -1, addr, '\0', NULL))
return;
}
sap->sa_family = AF_UNSPEC;
*len = 0;
}
/*
* Error-check and convert a string of mount options from user space into
* a data structure
*/
static int nfs_parse_mount_options(char *raw,
struct nfs_parsed_mount_data *mnt)
{
char *p, *string, *secdata;
int rc;
if (!raw) {
dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
return 1;
}
dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
secdata = alloc_secdata();
if (!secdata)
goto out_nomem;
rc = security_sb_copy_data(raw, secdata);
if (rc)
goto out_security_failure;
rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
if (rc)
goto out_security_failure;
free_secdata(secdata);
while ((p = strsep(&raw, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
int option, token;
if (!*p)
continue;
dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
token = match_token(p, nfs_mount_option_tokens, args);
switch (token) {
case Opt_soft:
mnt->flags |= NFS_MOUNT_SOFT;
break;
case Opt_hard:
mnt->flags &= ~NFS_MOUNT_SOFT;
break;
case Opt_posix:
mnt->flags |= NFS_MOUNT_POSIX;
break;
case Opt_noposix:
mnt->flags &= ~NFS_MOUNT_POSIX;
break;
case Opt_cto:
mnt->flags &= ~NFS_MOUNT_NOCTO;
break;
case Opt_nocto:
mnt->flags |= NFS_MOUNT_NOCTO;
break;
case Opt_ac:
mnt->flags &= ~NFS_MOUNT_NOAC;
break;
case Opt_noac:
mnt->flags |= NFS_MOUNT_NOAC;
break;
case Opt_lock:
mnt->flags &= ~NFS_MOUNT_NONLM;
break;
case Opt_nolock:
mnt->flags |= NFS_MOUNT_NONLM;
break;
case Opt_v2:
mnt->flags &= ~NFS_MOUNT_VER3;
break;
case Opt_v3:
mnt->flags |= NFS_MOUNT_VER3;
break;
case Opt_udp:
mnt->flags &= ~NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
mnt->timeo = 7;
mnt->retrans = 5;
break;
case Opt_tcp:
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
mnt->timeo = 600;
mnt->retrans = 2;
break;
case Opt_rdma:
mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
mnt->timeo = 600;
mnt->retrans = 2;
break;
case Opt_acl:
mnt->flags &= ~NFS_MOUNT_NOACL;
break;
case Opt_noacl:
mnt->flags |= NFS_MOUNT_NOACL;
break;
case Opt_rdirplus:
mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
break;
case Opt_nordirplus:
mnt->flags |= NFS_MOUNT_NORDIRPLUS;
break;
case Opt_sharecache:
mnt->flags &= ~NFS_MOUNT_UNSHARED;
break;
case Opt_nosharecache:
mnt->flags |= NFS_MOUNT_UNSHARED;
break;
case Opt_port:
if (match_int(args, &option))
return 0;
if (option < 0 || option > 65535)
return 0;
mnt->nfs_server.port = option;
break;
case Opt_rsize:
if (match_int(args, &mnt->rsize))
return 0;
break;
case Opt_wsize:
if (match_int(args, &mnt->wsize))
return 0;
break;
case Opt_bsize:
if (match_int(args, &option))
return 0;
if (option < 0)
return 0;
mnt->bsize = option;
break;
case Opt_timeo:
if (match_int(args, &mnt->timeo))
return 0;
break;
case Opt_retrans:
if (match_int(args, &mnt->retrans))
return 0;
break;
case Opt_acregmin:
if (match_int(args, &mnt->acregmin))
return 0;
break;
case Opt_acregmax:
if (match_int(args, &mnt->acregmax))
return 0;
break;
case Opt_acdirmin:
if (match_int(args, &mnt->acdirmin))
return 0;
break;
case Opt_acdirmax:
if (match_int(args, &mnt->acdirmax))
return 0;
break;
case Opt_actimeo:
if (match_int(args, &option))
return 0;
if (option < 0)
return 0;
mnt->acregmin =
mnt->acregmax =
mnt->acdirmin =
mnt->acdirmax = option;
break;
case Opt_namelen:
if (match_int(args, &mnt->namlen))
return 0;
break;
case Opt_mountport:
if (match_int(args, &option))
return 0;
if (option < 0 || option > 65535)
return 0;
mnt->mount_server.port = option;
break;
case Opt_mountvers:
if (match_int(args, &option))
return 0;
if (option < 0)
return 0;
mnt->mount_server.version = option;
break;
case Opt_nfsvers:
if (match_int(args, &option))
return 0;
switch (option) {
case 2:
mnt->flags &= ~NFS_MOUNT_VER3;
break;
case 3:
mnt->flags |= NFS_MOUNT_VER3;
break;
default:
goto out_unrec_vers;
}
break;
case Opt_sec:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
token = match_token(string, nfs_secflavor_tokens, args);
kfree(string);
/*
* The flags setting is for v2/v3. The flavor_len
* setting is for v4. v2/v3 also need to know the
* difference between NULL and UNIX.
*/
switch (token) {
case Opt_sec_none:
mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 0;
mnt->auth_flavors[0] = RPC_AUTH_NULL;
break;
case Opt_sec_sys:
mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 0;
mnt->auth_flavors[0] = RPC_AUTH_UNIX;
break;
case Opt_sec_krb5:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
break;
case Opt_sec_krb5i:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
break;
case Opt_sec_krb5p:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
break;
case Opt_sec_lkey:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
break;
case Opt_sec_lkeyi:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
break;
case Opt_sec_lkeyp:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
break;
case Opt_sec_spkm:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
break;
case Opt_sec_spkmi:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
break;
case Opt_sec_spkmp:
mnt->flags |= NFS_MOUNT_SECFLAVOUR;
mnt->auth_flavor_len = 1;
mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
break;
default:
goto out_unrec_sec;
}
break;
case Opt_proto:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
token = match_token(string,
nfs_xprt_protocol_tokens, args);
kfree(string);
switch (token) {
case Opt_xprt_udp:
mnt->flags &= ~NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
mnt->timeo = 7;
mnt->retrans = 5;
break;
case Opt_xprt_tcp:
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
mnt->timeo = 600;
mnt->retrans = 2;
break;
case Opt_xprt_rdma:
/* vector side protocols to TCP */
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
mnt->timeo = 600;
mnt->retrans = 2;
break;
default:
goto out_unrec_xprt;
}
break;
case Opt_mountproto:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
token = match_token(string,
nfs_xprt_protocol_tokens, args);
kfree(string);
switch (token) {
case Opt_xprt_udp:
mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp:
mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma: /* not used for side protocols */
default:
goto out_unrec_xprt;
}
break;
case Opt_addr:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
nfs_parse_server_address(string, (struct sockaddr *)
&mnt->nfs_server.address,
&mnt->nfs_server.addrlen);
kfree(string);
break;
case Opt_clientaddr:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
kfree(mnt->client_address);
mnt->client_address = string;
break;
case Opt_mounthost:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
kfree(mnt->mount_server.hostname);
mnt->mount_server.hostname = string;
break;
case Opt_mountaddr:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
nfs_parse_server_address(string, (struct sockaddr *)
&mnt->mount_server.address,
&mnt->mount_server.addrlen);
kfree(string);
break;
case Opt_userspace:
case Opt_deprecated:
dfprintk(MOUNT, "NFS: ignoring mount option "
"'%s'\n", p);
break;
default:
goto out_unknown;
}
}
nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
mnt->nfs_server.port);
return 1;
out_nomem:
printk(KERN_INFO "NFS: not enough memory to parse option\n");
return 0;
out_security_failure:
free_secdata(secdata);
printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
return 0;
out_unrec_vers:
printk(KERN_INFO "NFS: unrecognized NFS version number\n");
return 0;
out_unrec_xprt:
printk(KERN_INFO "NFS: unrecognized transport protocol\n");
return 0;
out_unrec_sec:
printk(KERN_INFO "NFS: unrecognized security flavor\n");
return 0;
out_unknown:
printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
return 0;
}
/*
* Use the remote server's MOUNT service to request the NFS file handle
* corresponding to the provided path.
*/
static int nfs_try_mount(struct nfs_parsed_mount_data *args,
struct nfs_fh *root_fh)
{
struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
char *hostname;
int status;
if (args->mount_server.version == 0) {
if (args->flags & NFS_MOUNT_VER3)
args->mount_server.version = NFS_MNT3_VERSION;
else
args->mount_server.version = NFS_MNT_VERSION;
}
if (args->mount_server.hostname)
hostname = args->mount_server.hostname;
else
hostname = args->nfs_server.hostname;
/*
* Construct the mount server's address.
*/
if (args->mount_server.address.ss_family == AF_UNSPEC) {
memcpy(sap, &args->nfs_server.address,
args->nfs_server.addrlen);
args->mount_server.addrlen = args->nfs_server.addrlen;
}
/*
* autobind will be used if mount_server.port == 0
*/
nfs_set_port(sap, args->mount_server.port);
/*
* Now ask the mount server to map our export path
* to a file handle.
*/
status = nfs_mount(sap,
args->mount_server.addrlen,
hostname,
args->nfs_server.export_path,
args->mount_server.version,
args->mount_server.protocol,
root_fh);
if (status == 0)
return 0;
dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
hostname, status);
return status;
}
/*
* Split "dev_name" into "hostname:export_path".
*
* Note: caller frees hostname and export path, even on error.
*/
static int nfs_parse_devname(const char *dev_name,
char **hostname, size_t maxnamlen,
char **export_path, size_t maxpathlen)
{
size_t len;
char *colon, *comma;
colon = strchr(dev_name, ':');
if (colon == NULL)
goto out_bad_devname;
len = colon - dev_name;
if (len > maxnamlen)
goto out_hostname;
/* N.B. caller will free nfs_server.hostname in all cases */
*hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (!*hostname)
goto out_nomem;
/* kill possible hostname list: not supported */
comma = strchr(*hostname, ',');
if (comma != NULL) {
if (comma == *hostname)
goto out_bad_devname;
*comma = '\0';
}
colon++;
len = strlen(colon);
if (len > maxpathlen)
goto out_path;
*export_path = kstrndup(colon, len, GFP_KERNEL);
if (!*export_path)
goto out_nomem;
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
return 0;
out_bad_devname:
dfprintk(MOUNT, "NFS: device name not in host:path format\n");
return -EINVAL;
out_nomem:
dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
return -ENOMEM;
out_hostname:
dfprintk(MOUNT, "NFS: server hostname too long\n");
return -ENAMETOOLONG;
out_path:
dfprintk(MOUNT, "NFS: export pathname too long\n");
return -ENAMETOOLONG;
}
/*
* Validate the NFS2/NFS3 mount data
* - fills in the mount root filehandle
*
* For option strings, user space handles the following behaviors:
*
* + DNS: mapping server host name to IP address ("addr=" option)
*
* + failure mode: how to behave if a mount request can't be handled
* immediately ("fg/bg" option)
*
* + retry: how often to retry a mount request ("retry=" option)
*
* + breaking back: trying proto=udp after proto=tcp, v2 after v3,
* mountproto=tcp after mountproto=udp, and so on
*/
static int nfs_validate_mount_data(void *options,
struct nfs_parsed_mount_data *args,
struct nfs_fh *mntfh,
const char *dev_name)
{
struct nfs_mount_data *data = (struct nfs_mount_data *)options;
if (data == NULL)
goto out_no_data;
args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
args->rsize = NFS_MAX_FILE_IO_SIZE;
args->wsize = NFS_MAX_FILE_IO_SIZE;
args->timeo = 600;
args->retrans = 2;
args->acregmin = 3;
args->acregmax = 60;
args->acdirmin = 30;
args->acdirmax = 60;
args->mount_server.port = 0; /* autobind unless user sets port */
args->mount_server.protocol = XPRT_TRANSPORT_UDP;
args->nfs_server.port = 0; /* autobind unless user sets port */
args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
switch (data->version) {
case 1:
data->namlen = 0;
case 2:
data->bsize = 0;
case 3:
if (data->flags & NFS_MOUNT_VER3)
goto out_no_v3;
data->root.size = NFS2_FHSIZE;
memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
case 4:
if (data->flags & NFS_MOUNT_SECFLAVOUR)
goto out_no_sec;
case 5:
memset(data->context, 0, sizeof(data->context));
case 6:
if (data->flags & NFS_MOUNT_VER3) {
if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
goto out_invalid_fh;
mntfh->size = data->root.size;
} else
mntfh->size = NFS2_FHSIZE;
memcpy(mntfh->data, data->root.data, mntfh->size);
if (mntfh->size < sizeof(mntfh->data))
memset(mntfh->data + mntfh->size, 0,
sizeof(mntfh->data) - mntfh->size);
/*
* Translate to nfs_parsed_mount_data, which nfs_fill_super
* can deal with.
*/
args->flags = data->flags;
args->rsize = data->rsize;
args->wsize = data->wsize;
args->timeo = data->timeo;
args->retrans = data->retrans;
args->acregmin = data->acregmin;
args->acregmax = data->acregmax;
args->acdirmin = data->acdirmin;
args->acdirmax = data->acdirmax;
memcpy(&args->nfs_server.address, &data->addr,
sizeof(data->addr));
args->nfs_server.addrlen = sizeof(data->addr);
if (!nfs_verify_server_address((struct sockaddr *)
&args->nfs_server.address))
goto out_no_address;
if (!(data->flags & NFS_MOUNT_TCP))
args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
/* N.B. caller will free nfs_server.hostname in all cases */
args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
args->namlen = data->namlen;
args->bsize = data->bsize;
args->auth_flavors[0] = data->pseudoflavor;
if (!args->nfs_server.hostname)
goto out_nomem;
/*
* The legacy version 6 binary mount data from userspace has a
* field used only to transport selinux information into the
* the kernel. To continue to support that functionality we
* have a touch of selinux knowledge here in the NFS code. The
* userspace code converted context=blah to just blah so we are
* converting back to the full string selinux understands.
*/
if (data->context[0]){
#ifdef CONFIG_SECURITY_SELINUX
int rc;
char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
if (!opts_str)
return -ENOMEM;
strcpy(opts_str, "context=");
data->context[NFS_MAX_CONTEXT_LEN] = '\0';
strcat(opts_str, &data->context[0]);
rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
kfree(opts_str);
if (rc)
return rc;
#else
return -EINVAL;
#endif
}
break;
default: {
int status;
if (nfs_parse_mount_options((char *)options, args) == 0)
return -EINVAL;
if (!nfs_verify_server_address((struct sockaddr *)
&args->nfs_server.address))
goto out_no_address;
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;
}
}
if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
args->auth_flavors[0] = RPC_AUTH_UNIX;
#ifndef CONFIG_NFS_V3
if (args->flags & NFS_MOUNT_VER3)
goto out_v3_not_compiled;
#endif /* !CONFIG_NFS_V3 */
return 0;
out_no_data:
dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
return -EINVAL;
out_no_v3:
dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
data->version);
return -EINVAL;
out_no_sec:
dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
return -EINVAL;
#ifndef CONFIG_NFS_V3
out_v3_not_compiled:
dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
return -EPROTONOSUPPORT;
#endif /* !CONFIG_NFS_V3 */
out_nomem:
dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
return -ENOMEM;
out_no_address:
dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
return -EINVAL;
out_invalid_fh:
dfprintk(MOUNT, "NFS: invalid root filehandle\n");
return -EINVAL;
}
static int
nfs_compare_remount_data(struct nfs_server *nfss,
struct nfs_parsed_mount_data *data)
{
if (data->flags != nfss->flags ||
data->rsize != nfss->rsize ||
data->wsize != nfss->wsize ||
data->retrans != nfss->client->cl_timeout->to_retries ||
data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
data->acregmin != nfss->acregmin / HZ ||
data->acregmax != nfss->acregmax / HZ ||
data->acdirmin != nfss->acdirmin / HZ ||
data->acdirmax != nfss->acdirmax / HZ ||
data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
data->nfs_server.addrlen) != 0)
return -EINVAL;
return 0;
}
static int
nfs_remount(struct super_block *sb, int *flags, char *raw_data)
{
int error;
struct nfs_server *nfss = sb->s_fs_info;
struct nfs_parsed_mount_data *data;
struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
u32 nfsvers = nfss->nfs_client->rpc_ops->version;
/*
* Userspace mount programs that send binary options generally send
* them populated with default values. We have no way to know which
* ones were explicitly specified. Fall back to legacy behavior and
* just return success.
*/
if ((nfsvers == 4 && options4->version == 1) ||
(nfsvers <= 3 && options->version >= 1 &&
options->version <= 6))
return 0;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
/* fill out struct with values from existing mount */
data->flags = nfss->flags;
data->rsize = nfss->rsize;
data->wsize = nfss->wsize;
data->retrans = nfss->client->cl_timeout->to_retries;
data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
data->acregmin = nfss->acregmin / HZ;
data->acregmax = nfss->acregmax / HZ;
data->acdirmin = nfss->acdirmin / HZ;
data->acdirmax = nfss->acdirmax / HZ;
data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
data->nfs_server.addrlen);
/* overwrite those values with any that were specified */
error = nfs_parse_mount_options((char *)options, data);
if (error < 0)
goto out;
/* compare new mount options with old ones */
error = nfs_compare_remount_data(nfss, data);
out:
kfree(data);
return error;
}
/*
* Initialise the common bits of the superblock
*/
static inline void nfs_initialise_sb(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
sb->s_magic = NFS_SUPER_MAGIC;
/* We probably want something more informative here */
snprintf(sb->s_id, sizeof(sb->s_id),
"%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
if (sb->s_blocksize == 0)
sb->s_blocksize = nfs_block_bits(server->wsize,
&sb->s_blocksize_bits);
if (server->flags & NFS_MOUNT_NOAC)
sb->s_flags |= MS_SYNCHRONOUS;
nfs_super_set_maxbytes(sb, server->maxfilesize);
}
/*
* Finish setting up an NFS2/3 superblock
*/
static void nfs_fill_super(struct super_block *sb,
struct nfs_parsed_mount_data *data)
{
struct nfs_server *server = NFS_SB(sb);
sb->s_blocksize_bits = 0;
sb->s_blocksize = 0;
if (data->bsize)
sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
if (server->flags & NFS_MOUNT_VER3) {
/* The VFS shouldn't apply the umask to mode bits. We will do
* so ourselves when necessary.
*/
sb->s_flags |= MS_POSIXACL;
sb->s_time_gran = 1;
}
sb->s_op = &nfs_sops;
nfs_initialise_sb(sb);
}
/*
* Finish setting up a cloned NFS2/3 superblock
*/
static void nfs_clone_super(struct super_block *sb,
const struct super_block *old_sb)
{
struct nfs_server *server = NFS_SB(sb);
sb->s_blocksize_bits = old_sb->s_blocksize_bits;
sb->s_blocksize = old_sb->s_blocksize;
sb->s_maxbytes = old_sb->s_maxbytes;
if (server->flags & NFS_MOUNT_VER3) {
/* The VFS shouldn't apply the umask to mode bits. We will do
* so ourselves when necessary.
*/
sb->s_flags |= MS_POSIXACL;
sb->s_time_gran = 1;
}
sb->s_op = old_sb->s_op;
nfs_initialise_sb(sb);
}
#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
{
const struct nfs_server *a = s->s_fs_info;
const struct rpc_clnt *clnt_a = a->client;
const struct rpc_clnt *clnt_b = b->client;
if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
goto Ebusy;
if (a->nfs_client != b->nfs_client)
goto Ebusy;
if (a->flags != b->flags)
goto Ebusy;
if (a->wsize != b->wsize)
goto Ebusy;
if (a->rsize != b->rsize)
goto Ebusy;
if (a->acregmin != b->acregmin)
goto Ebusy;
if (a->acregmax != b->acregmax)
goto Ebusy;
if (a->acdirmin != b->acdirmin)
goto Ebusy;
if (a->acdirmax != b->acdirmax)
goto Ebusy;
if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
goto Ebusy;
return 1;
Ebusy:
return 0;
}
struct nfs_sb_mountdata {
struct nfs_server *server;
int mntflags;
};
static int nfs_set_super(struct super_block *s, void *data)
{
struct nfs_sb_mountdata *sb_mntdata = data;
struct nfs_server *server = sb_mntdata->server;
int ret;
s->s_flags = sb_mntdata->mntflags;
s->s_fs_info = server;
ret = set_anon_super(s, server);
if (ret == 0)
server->s_dev = s->s_dev;
return ret;
}
static int nfs_compare_super_address(struct nfs_server *server1,
struct nfs_server *server2)
{
struct sockaddr *sap1, *sap2;
sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
if (sap1->sa_family != sap2->sa_family)
return 0;
switch (sap1->sa_family) {
case AF_INET: {
struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
return 0;
if (sin1->sin_port != sin2->sin_port)
return 0;
break;
}
case AF_INET6: {
struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
return 0;
if (sin1->sin6_port != sin2->sin6_port)
return 0;
break;
}
default:
return 0;
}
return 1;
}
static int nfs_compare_super(struct super_block *sb, void *data)
{
struct nfs_sb_mountdata *sb_mntdata = data;
struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
int mntflags = sb_mntdata->mntflags;
if (!nfs_compare_super_address(old, server))
return 0;
/* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
if (old->flags & NFS_MOUNT_UNSHARED)
return 0;
if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
return 0;
return nfs_compare_mount_options(sb, server, mntflags);
}
static int nfs_bdi_register(struct nfs_server *server)
{
return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}
static int nfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
{
struct nfs_server *server = NULL;
struct super_block *s;
struct nfs_parsed_mount_data *data;
struct nfs_fh *mntfh;
struct dentry *mntroot;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
if (data == NULL || mntfh == NULL)
goto out_free_fh;
security_init_mnt_opts(&data->lsm_opts);
/* Validate the mount data */
error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
if (error < 0)
goto out;
/* Get a volume representation */
server = nfs_create_server(data, mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out;
}
sb_mntdata.server = server;
if (server->flags & NFS_MOUNT_UNSHARED)
compare_super = NULL;
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_err_nosb;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
} else {
error = nfs_bdi_register(server);
if (error)
goto error_splat_super;
}
if (!s->s_root) {
/* initial superblock/root creation */
nfs_fill_super(s, data);
}
mntroot = nfs_get_root(s, mntfh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
error = security_sb_set_mnt_opts(s, &data->lsm_opts);
if (error)
goto error_splat_root;
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
error = 0;
out:
kfree(data->nfs_server.hostname);
kfree(data->mount_server.hostname);
security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
kfree(mntfh);
kfree(data);
return error;
out_err_nosb:
nfs_free_server(server);
goto out;
error_splat_root:
dput(mntroot);
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
goto out;
}
/*
* Destroy an NFS2/3 superblock
*/
static void nfs_kill_super(struct super_block *s)
{
struct nfs_server *server = NFS_SB(s);
bdi_unregister(&server->backing_dev_info);
kill_anon_super(s);
nfs_free_server(server);
}
/*
* Clone an NFS2/3 server record on xdev traversal (FSID-change)
*/
static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
struct vfsmount *mnt)
{
struct nfs_clone_mount *data = raw_data;
struct super_block *s;
struct nfs_server *server;
struct dentry *mntroot;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error;
dprintk("--> nfs_xdev_get_sb()\n");
/* create a new volume representation */
server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out_err_noserver;
}
sb_mntdata.server = server;
if (server->flags & NFS_MOUNT_UNSHARED)
compare_super = NULL;
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_err_nosb;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
} else {
error = nfs_bdi_register(server);
if (error)
goto error_splat_super;
}
if (!s->s_root) {
/* initial superblock/root creation */
nfs_clone_super(s, data->sb);
}
mntroot = nfs_get_root(s, data->fh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
dput(mntroot);
error = -ESTALE;
goto error_splat_super;
}
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
/* clone any lsm security options from the parent to the new sb */
security_sb_clone_mnt_opts(data->sb, s);
dprintk("<-- nfs_xdev_get_sb() = 0\n");
return 0;
out_err_nosb:
nfs_free_server(server);
out_err_noserver:
dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
return error;
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
return error;
}
#ifdef CONFIG_NFS_V4
/*
* Finish setting up a cloned NFS4 superblock
*/
static void nfs4_clone_super(struct super_block *sb,
const struct super_block *old_sb)
{
sb->s_blocksize_bits = old_sb->s_blocksize_bits;
sb->s_blocksize = old_sb->s_blocksize;
sb->s_maxbytes = old_sb->s_maxbytes;
sb->s_time_gran = 1;
sb->s_op = old_sb->s_op;
nfs_initialise_sb(sb);
}
/*
* Set up an NFS4 superblock
*/
static void nfs4_fill_super(struct super_block *sb)
{
sb->s_time_gran = 1;
sb->s_op = &nfs4_sops;
nfs_initialise_sb(sb);
}
/*
* Validate NFSv4 mount options
*/
static int nfs4_validate_mount_data(void *options,
struct nfs_parsed_mount_data *args,
const char *dev_name)
{
struct sockaddr_in *ap;
struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
char *c;
if (data == NULL)
goto out_no_data;
args->rsize = NFS_MAX_FILE_IO_SIZE;
args->wsize = NFS_MAX_FILE_IO_SIZE;
args->timeo = 600;
args->retrans = 2;
args->acregmin = 3;
args->acregmax = 60;
args->acdirmin = 30;
args->acdirmax = 60;
args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
switch (data->version) {
case 1:
ap = (struct sockaddr_in *)&args->nfs_server.address;
if (data->host_addrlen > sizeof(args->nfs_server.address))
goto out_no_address;
if (data->host_addrlen == 0)
goto out_no_address;
args->nfs_server.addrlen = data->host_addrlen;
if (copy_from_user(ap, data->host_addr, data->host_addrlen))
return -EFAULT;
if (!nfs_verify_server_address((struct sockaddr *)
&args->nfs_server.address))
goto out_no_address;
switch (data->auth_flavourlen) {
case 0:
args->auth_flavors[0] = RPC_AUTH_UNIX;
break;
case 1:
if (copy_from_user(&args->auth_flavors[0],
data->auth_flavours,
sizeof(args->auth_flavors[0])))
return -EFAULT;
break;
default:
goto out_inval_auth;
}
c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
if (IS_ERR(c))
return PTR_ERR(c);
args->nfs_server.hostname = c;
c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
if (IS_ERR(c))
return PTR_ERR(c);
args->nfs_server.export_path = c;
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
c = strndup_user(data->client_addr.data, 16);
if (IS_ERR(c))
return PTR_ERR(c);
args->client_address = c;
/*
* Translate to nfs_parsed_mount_data, which nfs4_fill_super
* can deal with.
*/
args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
args->rsize = data->rsize;
args->wsize = data->wsize;
args->timeo = data->timeo;
args->retrans = data->retrans;
args->acregmin = data->acregmin;
args->acregmax = data->acregmax;
args->acdirmin = data->acdirmin;
args->acdirmax = data->acdirmax;
args->nfs_server.protocol = data->proto;
break;
default: {
int status;
if (nfs_parse_mount_options((char *)options, args) == 0)
return -EINVAL;
if (!nfs_verify_server_address((struct sockaddr *)
&args->nfs_server.address))
return -EINVAL;
switch (args->auth_flavor_len) {
case 0:
args->auth_flavors[0] = RPC_AUTH_UNIX;
break;
case 1:
break;
default:
goto out_inval_auth;
}
if (args->client_address == NULL)
goto out_no_client_address;
status = nfs_parse_devname(dev_name,
&args->nfs_server.hostname,
NFS4_MAXNAMLEN,
&args->nfs_server.export_path,
NFS4_MAXPATHLEN);
if (status < 0)
return status;
break;
}
}
return 0;
out_no_data:
dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
return -EINVAL;
out_inval_auth:
dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
data->auth_flavourlen);
return -EINVAL;
out_no_address:
dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
return -EINVAL;
out_no_client_address:
dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
return -EINVAL;
}
/*
* Get the superblock for an NFS4 mountpoint
*/
static int nfs4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
{
struct nfs_parsed_mount_data *data;
struct super_block *s;
struct nfs_server *server;
struct nfs_fh *mntfh;
struct dentry *mntroot;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
if (data == NULL || mntfh == NULL)
goto out_free_fh;
security_init_mnt_opts(&data->lsm_opts);
/* Validate the mount data */
error = nfs4_validate_mount_data(raw_data, data, dev_name);
if (error < 0)
goto out;
/* Get a volume representation */
server = nfs4_create_server(data, mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out;
}
sb_mntdata.server = server;
if (server->flags & NFS4_MOUNT_UNSHARED)
compare_super = NULL;
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_free;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
} else {
error = nfs_bdi_register(server);
if (error)
goto error_splat_super;
}
if (!s->s_root) {
/* initial superblock/root creation */
nfs4_fill_super(s);
}
mntroot = nfs4_get_root(s, mntfh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
error = security_sb_set_mnt_opts(s, &data->lsm_opts);
if (error)
goto error_splat_root;
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
error = 0;
out:
kfree(data->client_address);
kfree(data->nfs_server.export_path);
kfree(data->nfs_server.hostname);
security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
kfree(mntfh);
kfree(data);
return error;
out_free:
nfs_free_server(server);
goto out;
error_splat_root:
dput(mntroot);
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
goto out;
}
static void nfs4_kill_super(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
nfs_return_all_delegations(sb);
kill_anon_super(sb);
nfs4_renewd_prepare_shutdown(server);
nfs_free_server(server);
}
/*
* Clone an NFS4 server record on xdev traversal (FSID-change)
*/
static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
struct vfsmount *mnt)
{
struct nfs_clone_mount *data = raw_data;
struct super_block *s;
struct nfs_server *server;
struct dentry *mntroot;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error;
dprintk("--> nfs4_xdev_get_sb()\n");
/* create a new volume representation */
server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out_err_noserver;
}
sb_mntdata.server = server;
if (server->flags & NFS4_MOUNT_UNSHARED)
compare_super = NULL;
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_err_nosb;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
} else {
error = nfs_bdi_register(server);
if (error)
goto error_splat_super;
}
if (!s->s_root) {
/* initial superblock/root creation */
nfs4_clone_super(s, data->sb);
}
mntroot = nfs4_get_root(s, data->fh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
dput(mntroot);
error = -ESTALE;
goto error_splat_super;
}
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
security_sb_clone_mnt_opts(data->sb, s);
dprintk("<-- nfs4_xdev_get_sb() = 0\n");
return 0;
out_err_nosb:
nfs_free_server(server);
out_err_noserver:
dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
return error;
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
return error;
}
/*
* Create an NFS4 server record on referral traversal
*/
static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
struct vfsmount *mnt)
{
struct nfs_clone_mount *data = raw_data;
struct super_block *s;
struct nfs_server *server;
struct dentry *mntroot;
struct nfs_fh mntfh;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error;
dprintk("--> nfs4_referral_get_sb()\n");
/* create a new volume representation */
server = nfs4_create_referral_server(data, &mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out_err_noserver;
}
sb_mntdata.server = server;
if (server->flags & NFS4_MOUNT_UNSHARED)
compare_super = NULL;
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_err_nosb;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
} else {
error = nfs_bdi_register(server);
if (error)
goto error_splat_super;
}
if (!s->s_root) {
/* initial superblock/root creation */
nfs4_fill_super(s);
}
mntroot = nfs4_get_root(s, &mntfh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
dput(mntroot);
error = -ESTALE;
goto error_splat_super;
}
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
security_sb_clone_mnt_opts(data->sb, s);
dprintk("<-- nfs4_referral_get_sb() = 0\n");
return 0;
out_err_nosb:
nfs_free_server(server);
out_err_noserver:
dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
return error;
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
return error;
}
#endif /* CONFIG_NFS_V4 */
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