Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 849 insertions, 0 deletions

diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c
new file mode 100644
index 000000000000..4765aaac9fd2
--- /dev/null
+++ b/fs/smbfs/inode.c
@@ -0,0 +1,849 @@
+/*
+ *  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/config.h>
+#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/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 super_block *, struct kstatfs *);
+static int  smb_show_options(struct seq_file *, struct vfsmount *);
+
+static kmem_cache_t *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, SLAB_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, kmem_cache_t * cachep, unsigned long flags)
+{
+        struct smb_inode_info *ei = (struct smb_inode_info *) foo;
+        unsigned long flagmask = SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR;
+
+        if ((flags & flagmask) == SLAB_CTOR_CONSTRUCTOR)
+                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,
+                                             init_once, NULL);
+        if (smb_inode_cachep == NULL)
+                return -ENOMEM;
+        return 0;
+}
+
+static void destroy_inodecache(void)
+{
+        if (kmem_cache_destroy(smb_inode_cachep))
+                printk(KERN_INFO "smb_inode_cache: not all structures were freed\n");
+}
+
+static int smb_remount(struct super_block *sb, int *flags, char *data)
+{
+        *flags |= MS_NODIRATIME;
+        return 0;
+}
+
+static 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_blksize= inode->i_blksize;
+        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_blksize= fattr->f_blksize;
+        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,
+                        (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);
+        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)
+{
+        if (server->remote_nls) {
+                unload_nls(server->remote_nls);
+                server->remote_nls = NULL;
+        }
+        if (server->local_nls) {
+                unload_nls(server->local_nls);
+                server->local_nls = NULL;
+        }
+}
+
+static void
+smb_put_super(struct super_block *sb)
+{
+        struct smb_sb_info *server = SMB_SB(sb);
+
+        smb_lock_server(server);
+        server->state = CONN_INVALID;
+        smbiod_unregister_server(server);
+
+        smb_close_socket(server);
+
+        if (server->conn_pid)
+                kill_proc(server->conn_pid, SIGTERM, 1);
+
+        smb_kfree(server->ops);
+        smb_unload_nls(server);
+        sb->s_fs_info = NULL;
+        smb_unlock_server(server);
+        smb_kfree(server);
+}
+
+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;
+
+        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 = smb_kmalloc(sizeof(struct smb_sb_info), GFP_KERNEL);
+        if (!server)
+                goto out_no_server;
+        sb->s_fs_info = server;
+        memset(server, 0, sizeof(struct smb_sb_info));
+
+        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 = 0;
+        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 = %d\n", sizeof(struct smb_ops) +
+                sizeof(struct smb_mount_data_kernel));
+        mem = smb_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:
+        smb_kfree(mem);
+out_no_mem:
+        if (!server->mnt)
+                printk(KERN_ERR "smb_fill_super: allocation failure\n");
+        sb->s_fs_info = NULL;
+        smb_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 super_block *sb, struct kstatfs *buf)
+{
+        int result;
+        
+        lock_kernel();
+
+        result = smb_proc_dskattr(sb, 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_fdatawrite(inode->i_mapping);
+                filemap_fdatawait(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;
+}
+
+#ifdef DEBUG_SMB_MALLOC
+int smb_malloced;
+int smb_current_kmalloced;
+int smb_current_vmalloced;
+#endif
+
+static struct super_block *smb_get_sb(struct file_system_type *fs_type,
+        int flags, const char *dev_name, void *data)
+{
+        return get_sb_nodev(fs_type, flags, data, smb_fill_super);
+}
+
+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");
+
+#ifdef DEBUG_SMB_MALLOC
+        smb_malloced = 0;
+        smb_current_kmalloced = 0;
+        smb_current_vmalloced = 0;
+#endif
+
+        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();
+#ifdef DEBUG_SMB_MALLOC
+        printk(KERN_DEBUG "smb_malloced: %d\n", smb_malloced);
+        printk(KERN_DEBUG "smb_current_kmalloced: %d\n",smb_current_kmalloced);
+        printk(KERN_DEBUG "smb_current_vmalloced: %d\n",smb_current_vmalloced);
+#endif
+}
+
+module_init(init_smb_fs)
+module_exit(exit_smb_fs)
+MODULE_LICENSE("GPL");