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linux/fs/smbfs/inode.c

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/*
* inode.c
*
* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
* Copyright (C) 1997 by Volker Lendecke
*
* Please add a note about your changes to smbfs in the ChangeLog file.
*/
#include <linux/module.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/slab.h>
#include <linux/init.h>
#include <linux/file.h>
#include <linux/dcache.h>
#include <linux/smp_lock.h>
#include <linux/nls.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/net.h>
#include <linux/vfs.h>
#include <linux/highuid.h>
#include <linux/sched.h>
#include <linux/smb_fs.h>
#include <linux/smbno.h>
#include <linux/smb_mount.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include "smb_debug.h"
#include "getopt.h"
#include "proto.h"
/* Always pick a default string */
#ifdef CONFIG_SMB_NLS_REMOTE
#define SMB_NLS_REMOTE CONFIG_SMB_NLS_REMOTE
#else
#define SMB_NLS_REMOTE ""
#endif
#define SMB_TTL_DEFAULT 1000
static void smb_delete_inode(struct inode *);
static void smb_put_super(struct super_block *);
static int smb_statfs(struct dentry *, struct kstatfs *);
static int smb_show_options(struct seq_file *, struct vfsmount *);
static struct kmem_cache *smb_inode_cachep;
static struct inode *smb_alloc_inode(struct super_block *sb)
{
struct smb_inode_info *ei;
ei = (struct smb_inode_info *)kmem_cache_alloc(smb_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
return &ei->vfs_inode;
}
static void smb_destroy_inode(struct inode *inode)
{
kmem_cache_free(smb_inode_cachep, SMB_I(inode));
}
static void init_once(void *foo)
{
struct smb_inode_info *ei = (struct smb_inode_info *) foo;
inode_init_once(&ei->vfs_inode);
}
static int init_inodecache(void)
{
smb_inode_cachep = kmem_cache_create("smb_inode_cache",
sizeof(struct smb_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD),
init_once);
if (smb_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
kmem_cache_destroy(smb_inode_cachep);
}
static int smb_remount(struct super_block *sb, int *flags, char *data)
{
*flags |= MS_NODIRATIME;
return 0;
}
static const struct super_operations smb_sops =
{
.alloc_inode = smb_alloc_inode,
.destroy_inode = smb_destroy_inode,
.drop_inode = generic_delete_inode,
.delete_inode = smb_delete_inode,
.put_super = smb_put_super,
.statfs = smb_statfs,
.show_options = smb_show_options,
.remount_fs = smb_remount,
};
/* We are always generating a new inode here */
struct inode *
smb_iget(struct super_block *sb, struct smb_fattr *fattr)
{
struct smb_sb_info *server = SMB_SB(sb);
struct inode *result;
DEBUG1("smb_iget: %p\n", fattr);
result = new_inode(sb);
if (!result)
return result;
result->i_ino = fattr->f_ino;
SMB_I(result)->open = 0;
SMB_I(result)->fileid = 0;
SMB_I(result)->access = 0;
SMB_I(result)->flags = 0;
SMB_I(result)->closed = 0;
SMB_I(result)->openers = 0;
smb_set_inode_attr(result, fattr);
if (S_ISREG(result->i_mode)) {
result->i_op = &smb_file_inode_operations;
result->i_fop = &smb_file_operations;
result->i_data.a_ops = &smb_file_aops;
} else if (S_ISDIR(result->i_mode)) {
if (server->opt.capabilities & SMB_CAP_UNIX)
result->i_op = &smb_dir_inode_operations_unix;
else
result->i_op = &smb_dir_inode_operations;
result->i_fop = &smb_dir_operations;
} else if (S_ISLNK(result->i_mode)) {
result->i_op = &smb_link_inode_operations;
} else {
init_special_inode(result, result->i_mode, fattr->f_rdev);
}
insert_inode_hash(result);
return result;
}
/*
* Copy the inode data to a smb_fattr structure.
*/
void
smb_get_inode_attr(struct inode *inode, struct smb_fattr *fattr)
{
memset(fattr, 0, sizeof(struct smb_fattr));
fattr->f_mode = inode->i_mode;
fattr->f_nlink = inode->i_nlink;
fattr->f_ino = inode->i_ino;
fattr->f_uid = inode->i_uid;
fattr->f_gid = inode->i_gid;
fattr->f_size = inode->i_size;
fattr->f_mtime = inode->i_mtime;
fattr->f_ctime = inode->i_ctime;
fattr->f_atime = inode->i_atime;
fattr->f_blocks = inode->i_blocks;
fattr->attr = SMB_I(inode)->attr;
/*
* Keep the attributes in sync with the inode permissions.
*/
if (fattr->f_mode & S_IWUSR)
fattr->attr &= ~aRONLY;
else
fattr->attr |= aRONLY;
}
/*
* Update the inode, possibly causing it to invalidate its pages if mtime/size
* is different from last time.
*/
void
smb_set_inode_attr(struct inode *inode, struct smb_fattr *fattr)
{
struct smb_inode_info *ei = SMB_I(inode);
/*
* A size change should have a different mtime, or same mtime
* but different size.
*/
time_t last_time = inode->i_mtime.tv_sec;
loff_t last_sz = inode->i_size;
inode->i_mode = fattr->f_mode;
inode->i_nlink = fattr->f_nlink;
inode->i_uid = fattr->f_uid;
inode->i_gid = fattr->f_gid;
inode->i_ctime = fattr->f_ctime;
inode->i_blocks = fattr->f_blocks;
inode->i_size = fattr->f_size;
inode->i_mtime = fattr->f_mtime;
inode->i_atime = fattr->f_atime;
ei->attr = fattr->attr;
/*
* Update the "last time refreshed" field for revalidation.
*/
ei->oldmtime = jiffies;
if (inode->i_mtime.tv_sec != last_time || inode->i_size != last_sz) {
VERBOSE("%ld changed, old=%ld, new=%ld, oz=%ld, nz=%ld\n",
inode->i_ino,
(long) last_time, (long) inode->i_mtime.tv_sec,
(long) last_sz, (long) inode->i_size);
if (!S_ISDIR(inode->i_mode))
invalidate_remote_inode(inode);
}
}
/*
* This is called if the connection has gone bad ...
* try to kill off all the current inodes.
*/
void
smb_invalidate_inodes(struct smb_sb_info *server)
{
VERBOSE("\n");
shrink_dcache_sb(SB_of(server));
invalidate_inodes(SB_of(server));
}
/*
* This is called to update the inode attributes after
* we've made changes to a file or directory.
*/
static int
smb_refresh_inode(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
int error;
struct smb_fattr fattr;
error = smb_proc_getattr(dentry, &fattr);
if (!error) {
smb_renew_times(dentry);
/*
* Check whether the type part of the mode changed,
* and don't update the attributes if it did.
*
* And don't dick with the root inode
*/
if (inode->i_ino == 2)
return error;
if (S_ISLNK(inode->i_mode))
return error; /* VFS will deal with it */
if ((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT)) {
smb_set_inode_attr(inode, &fattr);
} else {
/*
* Big trouble! The inode has become a new object,
* so any operations attempted on it are invalid.
*
* To limit damage, mark the inode as bad so that
* subsequent lookup validations will fail.
*/
PARANOIA("%s/%s changed mode, %07o to %07o\n",
DENTRY_PATH(dentry),
inode->i_mode, fattr.f_mode);
fattr.f_mode = inode->i_mode; /* save mode */
make_bad_inode(inode);
inode->i_mode = fattr.f_mode; /* restore mode */
/*
* No need to worry about unhashing the dentry: the
* lookup validation will see that the inode is bad.
* But we do want to invalidate the caches ...
*/
if (!S_ISDIR(inode->i_mode))
invalidate_remote_inode(inode);
else
smb_invalid_dir_cache(inode);
error = -EIO;
}
}
return error;
}
/*
* This is called when we want to check whether the inode
* has changed on the server. If it has changed, we must
* invalidate our local caches.
*/
int
smb_revalidate_inode(struct dentry *dentry)
{
struct smb_sb_info *s = server_from_dentry(dentry);
struct inode *inode = dentry->d_inode;
int error = 0;
DEBUG1("smb_revalidate_inode\n");
lock_kernel();
/*
* Check whether we've recently refreshed the inode.
*/
if (time_before(jiffies, SMB_I(inode)->oldmtime + SMB_MAX_AGE(s))) {
VERBOSE("up-to-date, ino=%ld, jiffies=%lu, oldtime=%lu\n",
inode->i_ino, jiffies, SMB_I(inode)->oldmtime);
goto out;
}
error = smb_refresh_inode(dentry);
out:
unlock_kernel();
return error;
}
/*
* This routine is called when i_nlink == 0 and i_count goes to 0.
* All blocking cleanup operations need to go here to avoid races.
*/
static void
smb_delete_inode(struct inode *ino)
{
DEBUG1("ino=%ld\n", ino->i_ino);
truncate_inode_pages(&ino->i_data, 0);
lock_kernel();
if (smb_close(ino))
PARANOIA("could not close inode %ld\n", ino->i_ino);
unlock_kernel();
clear_inode(ino);
}
static struct option opts[] = {
{ "version", 0, 'v' },
{ "win95", SMB_MOUNT_WIN95, 1 },
{ "oldattr", SMB_MOUNT_OLDATTR, 1 },
{ "dirattr", SMB_MOUNT_DIRATTR, 1 },
{ "case", SMB_MOUNT_CASE, 1 },
{ "uid", 0, 'u' },
{ "gid", 0, 'g' },
{ "file_mode", 0, 'f' },
{ "dir_mode", 0, 'd' },
{ "iocharset", 0, 'i' },
{ "codepage", 0, 'c' },
{ "ttl", 0, 't' },
{ NULL, 0, 0}
};
static int
parse_options(struct smb_mount_data_kernel *mnt, char *options)
{
int c;
unsigned long flags;
unsigned long value;
char *optarg;
char *optopt;
flags = 0;
while ( (c = smb_getopt("smbfs", &options, opts,
&optopt, &optarg, &flags, &value)) > 0) {
VERBOSE("'%s' -> '%s'\n", optopt, optarg ? optarg : "<none>");
switch (c) {
case 1:
/* got a "flag" option */
break;
case 'v':
if (value != SMB_MOUNT_VERSION) {
printk ("smbfs: Bad mount version %ld, expected %d\n",
value, SMB_MOUNT_VERSION);
return 0;
}
mnt->version = value;
break;
case 'u':
mnt->uid = value;
flags |= SMB_MOUNT_UID;
break;
case 'g':
mnt->gid = value;
flags |= SMB_MOUNT_GID;
break;
case 'f':
mnt->file_mode = (value & S_IRWXUGO) | S_IFREG;
flags |= SMB_MOUNT_FMODE;
break;
case 'd':
mnt->dir_mode = (value & S_IRWXUGO) | S_IFDIR;
flags |= SMB_MOUNT_DMODE;
break;
case 'i':
strlcpy(mnt->codepage.local_name, optarg,
SMB_NLS_MAXNAMELEN);
break;
case 'c':
strlcpy(mnt->codepage.remote_name, optarg,
SMB_NLS_MAXNAMELEN);
break;
case 't':
mnt->ttl = value;
break;
default:
printk ("smbfs: Unrecognized mount option %s\n",
optopt);
return -1;
}
}
mnt->flags = flags;
return c;
}
/*
* smb_show_options() is for displaying mount options in /proc/mounts.
* It tries to avoid showing settings that were not changed from their
* defaults.
*/
static int
smb_show_options(struct seq_file *s, struct vfsmount *m)
{
struct smb_mount_data_kernel *mnt = SMB_SB(m->mnt_sb)->mnt;
int i;
for (i = 0; opts[i].name != NULL; i++)
if (mnt->flags & opts[i].flag)
seq_printf(s, ",%s", opts[i].name);
if (mnt->flags & SMB_MOUNT_UID)
seq_printf(s, ",uid=%d", mnt->uid);
if (mnt->flags & SMB_MOUNT_GID)
seq_printf(s, ",gid=%d", mnt->gid);
if (mnt->mounted_uid != 0)
seq_printf(s, ",mounted_uid=%d", mnt->mounted_uid);
/*
* Defaults for file_mode and dir_mode are unknown to us; they
* depend on the current umask of the user doing the mount.
*/
if (mnt->flags & SMB_MOUNT_FMODE)
seq_printf(s, ",file_mode=%04o", mnt->file_mode & S_IRWXUGO);
if (mnt->flags & SMB_MOUNT_DMODE)
seq_printf(s, ",dir_mode=%04o", mnt->dir_mode & S_IRWXUGO);
if (strcmp(mnt->codepage.local_name, CONFIG_NLS_DEFAULT))
seq_printf(s, ",iocharset=%s", mnt->codepage.local_name);
if (strcmp(mnt->codepage.remote_name, SMB_NLS_REMOTE))
seq_printf(s, ",codepage=%s", mnt->codepage.remote_name);
if (mnt->ttl != SMB_TTL_DEFAULT)
seq_printf(s, ",ttl=%d", mnt->ttl);
return 0;
}
static void
smb_unload_nls(struct smb_sb_info *server)
{
unload_nls(server->remote_nls);
unload_nls(server->local_nls);
}
static void
smb_put_super(struct super_block *sb)
{
struct smb_sb_info *server = SMB_SB(sb);
lock_kernel();
smb_lock_server(server);
server->state = CONN_INVALID;
smbiod_unregister_server(server);
smb_close_socket(server);
if (server->conn_pid)
kill_pid(server->conn_pid, SIGTERM, 1);
kfree(server->ops);
smb_unload_nls(server);
sb->s_fs_info = NULL;
smb_unlock_server(server);
put_pid(server->conn_pid);
kfree(server);
unlock_kernel();
}
static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
{
struct smb_sb_info *server;
struct smb_mount_data_kernel *mnt;
struct smb_mount_data *oldmnt;
struct inode *root_inode;
struct smb_fattr root;
int ver;
void *mem;
static int warn_count;
if (warn_count < 5) {
warn_count++;
printk(KERN_EMERG "smbfs is deprecated and will be removed"
" from the 2.6.27 kernel. Please migrate to cifs\n");
}
if (!raw_data)
goto out_no_data;
oldmnt = (struct smb_mount_data *) raw_data;
ver = oldmnt->version;
if (ver != SMB_MOUNT_OLDVERSION && cpu_to_be32(ver) != SMB_MOUNT_ASCII)
goto out_wrong_data;
sb->s_flags |= MS_NODIRATIME;
sb->s_blocksize = 1024; /* Eh... Is this correct? */
sb->s_blocksize_bits = 10;
sb->s_magic = SMB_SUPER_MAGIC;
sb->s_op = &smb_sops;
sb->s_time_gran = 100;
server = kzalloc(sizeof(struct smb_sb_info), GFP_KERNEL);
if (!server)
goto out_no_server;
sb->s_fs_info = server;
server->super_block = sb;
server->mnt = NULL;
server->sock_file = NULL;
init_waitqueue_head(&server->conn_wq);
init_MUTEX(&server->sem);
INIT_LIST_HEAD(&server->entry);
INIT_LIST_HEAD(&server->xmitq);
INIT_LIST_HEAD(&server->recvq);
server->conn_error = 0;
server->conn_pid = NULL;
server->state = CONN_INVALID; /* no connection yet */
server->generation = 0;
/* Allocate the global temp buffer and some superblock helper structs */
/* FIXME: move these to the smb_sb_info struct */
VERBOSE("alloc chunk = %lu\n", sizeof(struct smb_ops) +
sizeof(struct smb_mount_data_kernel));
mem = kmalloc(sizeof(struct smb_ops) +
sizeof(struct smb_mount_data_kernel), GFP_KERNEL);
if (!mem)
goto out_no_mem;
server->ops = mem;
smb_install_null_ops(server->ops);
server->mnt = mem + sizeof(struct smb_ops);
/* Setup NLS stuff */
server->remote_nls = NULL;
server->local_nls = NULL;
mnt = server->mnt;
memset(mnt, 0, sizeof(struct smb_mount_data_kernel));
strlcpy(mnt->codepage.local_name, CONFIG_NLS_DEFAULT,
SMB_NLS_MAXNAMELEN);
strlcpy(mnt->codepage.remote_name, SMB_NLS_REMOTE,
SMB_NLS_MAXNAMELEN);
mnt->ttl = SMB_TTL_DEFAULT;
if (ver == SMB_MOUNT_OLDVERSION) {
mnt->version = oldmnt->version;
SET_UID(mnt->uid, oldmnt->uid);
SET_GID(mnt->gid, oldmnt->gid);
mnt->file_mode = (oldmnt->file_mode & S_IRWXUGO) | S_IFREG;
mnt->dir_mode = (oldmnt->dir_mode & S_IRWXUGO) | S_IFDIR;
mnt->flags = (oldmnt->file_mode >> 9) | SMB_MOUNT_UID |
SMB_MOUNT_GID | SMB_MOUNT_FMODE | SMB_MOUNT_DMODE;
} else {
mnt->file_mode = S_IRWXU | S_IRGRP | S_IXGRP |
S_IROTH | S_IXOTH | S_IFREG;
mnt->dir_mode = S_IRWXU | S_IRGRP | S_IXGRP |
S_IROTH | S_IXOTH | S_IFDIR;
if (parse_options(mnt, raw_data))
goto out_bad_option;
}
mnt->mounted_uid = current_uid();
smb_setcodepage(server, &mnt->codepage);
/*
* Display the enabled options
* Note: smb_proc_getattr uses these in 2.4 (but was changed in 2.2)
*/
if (mnt->flags & SMB_MOUNT_OLDATTR)
printk("SMBFS: Using core getattr (Win 95 speedup)\n");
else if (mnt->flags & SMB_MOUNT_DIRATTR)
printk("SMBFS: Using dir ff getattr\n");
if (smbiod_register_server(server) < 0) {
printk(KERN_ERR "smbfs: failed to start smbiod\n");
goto out_no_smbiod;
}
/*
* Keep the super block locked while we get the root inode.
*/
smb_init_root_dirent(server, &root, sb);
root_inode = smb_iget(sb, &root);
if (!root_inode)
goto out_no_root;
sb->s_root = d_alloc_root(root_inode);
if (!sb->s_root)
goto out_no_root;
smb_new_dentry(sb->s_root);
return 0;
out_no_root:
iput(root_inode);
out_no_smbiod:
smb_unload_nls(server);
out_bad_option:
kfree(mem);
out_no_mem:
if (!server->mnt)
printk(KERN_ERR "smb_fill_super: allocation failure\n");
sb->s_fs_info = NULL;
kfree(server);
goto out_fail;
out_wrong_data:
printk(KERN_ERR "smbfs: mount_data version %d is not supported\n", ver);
goto out_fail;
out_no_data:
printk(KERN_ERR "smb_fill_super: missing data argument\n");
out_fail:
return -EINVAL;
out_no_server:
printk(KERN_ERR "smb_fill_super: cannot allocate struct smb_sb_info\n");
return -ENOMEM;
}
static int
smb_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int result;
lock_kernel();
result = smb_proc_dskattr(dentry, buf);
unlock_kernel();
buf->f_type = SMB_SUPER_MAGIC;
buf->f_namelen = SMB_MAXPATHLEN;
return result;
}
int smb_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
int err = smb_revalidate_inode(dentry);
if (!err)
generic_fillattr(dentry->d_inode, stat);
return err;
}
int
smb_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
struct smb_sb_info *server = server_from_dentry(dentry);
unsigned int mask = (S_IFREG | S_IFDIR | S_IRWXUGO);
int error, changed, refresh = 0;
struct smb_fattr fattr;
lock_kernel();
error = smb_revalidate_inode(dentry);
if (error)
goto out;
if ((error = inode_change_ok(inode, attr)) < 0)
goto out;
error = -EPERM;
if ((attr->ia_valid & ATTR_UID) && (attr->ia_uid != server->mnt->uid))
goto out;
if ((attr->ia_valid & ATTR_GID) && (attr->ia_uid != server->mnt->gid))
goto out;
if ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~mask))
goto out;
if ((attr->ia_valid & ATTR_SIZE) != 0) {
VERBOSE("changing %s/%s, old size=%ld, new size=%ld\n",
DENTRY_PATH(dentry),
(long) inode->i_size, (long) attr->ia_size);
filemap_write_and_wait(inode->i_mapping);
error = smb_open(dentry, O_WRONLY);
if (error)
goto out;
error = server->ops->truncate(inode, attr->ia_size);
if (error)
goto out;
error = vmtruncate(inode, attr->ia_size);
if (error)
goto out;
refresh = 1;
}
if (server->opt.capabilities & SMB_CAP_UNIX) {
/* For now we don't want to set the size with setattr_unix */
attr->ia_valid &= ~ATTR_SIZE;
/* FIXME: only call if we actually want to set something? */
error = smb_proc_setattr_unix(dentry, attr, 0, 0);
if (!error)
refresh = 1;
goto out;
}
/*
* Initialize the fattr and check for changed fields.
* Note: CTIME under SMB is creation time rather than
* change time, so we don't attempt to change it.
*/
smb_get_inode_attr(inode, &fattr);
changed = 0;
if ((attr->ia_valid & ATTR_MTIME) != 0) {
fattr.f_mtime = attr->ia_mtime;
changed = 1;
}
if ((attr->ia_valid & ATTR_ATIME) != 0) {
fattr.f_atime = attr->ia_atime;
/* Earlier protocols don't have an access time */
if (server->opt.protocol >= SMB_PROTOCOL_LANMAN2)
changed = 1;
}
if (changed) {
error = smb_proc_settime(dentry, &fattr);
if (error)
goto out;
refresh = 1;
}
/*
* Check for mode changes ... we're extremely limited in
* what can be set for SMB servers: just the read-only bit.
*/
if ((attr->ia_valid & ATTR_MODE) != 0) {
VERBOSE("%s/%s mode change, old=%x, new=%x\n",
DENTRY_PATH(dentry), fattr.f_mode, attr->ia_mode);
changed = 0;
if (attr->ia_mode & S_IWUSR) {
if (fattr.attr & aRONLY) {
fattr.attr &= ~aRONLY;
changed = 1;
}
} else {
if (!(fattr.attr & aRONLY)) {
fattr.attr |= aRONLY;
changed = 1;
}
}
if (changed) {
error = smb_proc_setattr(dentry, &fattr);
if (error)
goto out;
refresh = 1;
}
}
error = 0;
out:
if (refresh)
smb_refresh_inode(dentry);
unlock_kernel();
return error;
}
static int smb_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_nodev(fs_type, flags, data, smb_fill_super, mnt);
}
static struct file_system_type smb_fs_type = {
.owner = THIS_MODULE,
.name = "smbfs",
.get_sb = smb_get_sb,
.kill_sb = kill_anon_super,
.fs_flags = FS_BINARY_MOUNTDATA,
};
static int __init init_smb_fs(void)
{
int err;
DEBUG1("registering ...\n");
err = init_inodecache();
if (err)
goto out_inode;
err = smb_init_request_cache();
if (err)
goto out_request;
err = register_filesystem(&smb_fs_type);
if (err)
goto out;
return 0;
out:
smb_destroy_request_cache();
out_request:
destroy_inodecache();
out_inode:
return err;
}
static void __exit exit_smb_fs(void)
{
DEBUG1("unregistering ...\n");
unregister_filesystem(&smb_fs_type);
smb_destroy_request_cache();
destroy_inodecache();
}
module_init(init_smb_fs)
module_exit(exit_smb_fs)
MODULE_LICENSE("GPL");
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