/*
 *  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");