fs/smbfs/inode.c

   1 /*
   2  *  inode.c
   3  *
   4  *  Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
   5  *  Copyright (C) 1997 by Volker Lendecke
   6  *
   7  *  Please add a note about your changes to smbfs in the ChangeLog file.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/time.h>
  12 #include <linux/kernel.h>
  13 #include <linux/mm.h>
  14 #include <linux/string.h>
  15 #include <linux/stat.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19 #include <linux/file.h>
  20 #include <linux/dcache.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/nls.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/mount.h>
  25 #include <linux/net.h>
  26 #include <linux/vfs.h>
  27 #include <linux/highuid.h>
  28 #include <linux/sched.h>
  29 #include <linux/smb_fs.h>
  30 #include <linux/smbno.h>
  31 #include <linux/smb_mount.h>
  32
  33 #include <asm/system.h>
  34 #include <asm/uaccess.h>
  35
  36 #include "smb_debug.h"
  37 #include "getopt.h"
  38 #include "proto.h"
  39
  40 /* Always pick a default string */
  41 #ifdef CONFIG_SMB_NLS_REMOTE
  42 #define SMB_NLS_REMOTE CONFIG_SMB_NLS_REMOTE
  43 #else
  44 #define SMB_NLS_REMOTE ""
  45 #endif
  46
  47 #define SMB_TTL_DEFAULT 1000
  48
  49 static void smb_delete_inode(struct inode *);
  50 static void smb_put_super(struct super_block *);
  51 static int  smb_statfs(struct dentry *, struct kstatfs *);
  52 static int  smb_show_options(struct seq_file *, struct vfsmount *);
  53
  54 static struct kmem_cache *smb_inode_cachep;
  55
  56 static struct inode *smb_alloc_inode(struct super_block *sb)
  57 {
  58         struct smb_inode_info *ei;
  59         ei = (struct smb_inode_info *)kmem_cache_alloc(smb_inode_cachep, GFP_KERNEL);
  60         if (!ei)
  61                 return NULL;
  62         return &ei->vfs_inode;
  63 }
  64
  65 static void smb_destroy_inode(struct inode *inode)
  66 {
  67         kmem_cache_free(smb_inode_cachep, SMB_I(inode));
  68 }
  69
  70 static void init_once(struct kmem_cache *cachep, void *foo)
  71 {
  72         struct smb_inode_info *ei = (struct smb_inode_info *) foo;
  73
  74         inode_init_once(&ei->vfs_inode);
  75 }
  76
  77 static int init_inodecache(void)
  78 {
  79         smb_inode_cachep = kmem_cache_create("smb_inode_cache",
  80                                              sizeof(struct smb_inode_info),
  81                                              0, (SLAB_RECLAIM_ACCOUNT|
  82                                                 SLAB_MEM_SPREAD),
  83                                              init_once);
  84         if (smb_inode_cachep == NULL)
  85                 return -ENOMEM;
  86         return 0;
  87 }
  88
  89 static void destroy_inodecache(void)
  90 {
  91         kmem_cache_destroy(smb_inode_cachep);
  92 }
  93
  94 static int smb_remount(struct super_block *sb, int *flags, char *data)
  95 {
  96         *flags |= MS_NODIRATIME;
  97         return 0;
  98 }
  99
 100 static const struct super_operations smb_sops =
 101 {
 102         .alloc_inode    = smb_alloc_inode,
 103         .destroy_inode  = smb_destroy_inode,
 104         .drop_inode     = generic_delete_inode,
 105         .delete_inode   = smb_delete_inode,
 106         .put_super      = smb_put_super,
 107         .statfs         = smb_statfs,
 108         .show_options   = smb_show_options,
 109         .remount_fs     = smb_remount,
 110 };
 111
 112
 113 /* We are always generating a new inode here */
 114 struct inode *
 115 smb_iget(struct super_block *sb, struct smb_fattr *fattr)
 116 {
 117         struct smb_sb_info *server = SMB_SB(sb);
 118         struct inode *result;
 119
 120         DEBUG1("smb_iget: %p\n", fattr);
 121
 122         result = new_inode(sb);
 123         if (!result)
 124                 return result;
 125         result->i_ino = fattr->f_ino;
 126         SMB_I(result)->open = 0;
 127         SMB_I(result)->fileid = 0;
 128         SMB_I(result)->access = 0;
 129         SMB_I(result)->flags = 0;
 130         SMB_I(result)->closed = 0;
 131         SMB_I(result)->openers = 0;
 132         smb_set_inode_attr(result, fattr);
 133         if (S_ISREG(result->i_mode)) {
 134                 result->i_op = &smb_file_inode_operations;
 135                 result->i_fop = &smb_file_operations;
 136                 result->i_data.a_ops = &smb_file_aops;
 137         } else if (S_ISDIR(result->i_mode)) {
 138                 if (server->opt.capabilities & SMB_CAP_UNIX)
 139                         result->i_op = &smb_dir_inode_operations_unix;
 140                 else
 141                         result->i_op = &smb_dir_inode_operations;
 142                 result->i_fop = &smb_dir_operations;
 143         } else if (S_ISLNK(result->i_mode)) {
 144                 result->i_op = &smb_link_inode_operations;
 145         } else {
 146                 init_special_inode(result, result->i_mode, fattr->f_rdev);
 147         }
 148         insert_inode_hash(result);
 149         return result;
 150 }
 151
 152 /*
 153  * Copy the inode data to a smb_fattr structure.
 154  */
 155 void
 156 smb_get_inode_attr(struct inode *inode, struct smb_fattr *fattr)
 157 {
 158         memset(fattr, 0, sizeof(struct smb_fattr));
 159         fattr->f_mode   = inode->i_mode;
 160         fattr->f_nlink  = inode->i_nlink;
 161         fattr->f_ino    = inode->i_ino;
 162         fattr->f_uid    = inode->i_uid;
 163         fattr->f_gid    = inode->i_gid;
 164         fattr->f_size   = inode->i_size;
 165         fattr->f_mtime  = inode->i_mtime;
 166         fattr->f_ctime  = inode->i_ctime;
 167         fattr->f_atime  = inode->i_atime;
 168         fattr->f_blocks = inode->i_blocks;
 169
 170         fattr->attr     = SMB_I(inode)->attr;
 171         /*
 172          * Keep the attributes in sync with the inode permissions.
 173          */
 174         if (fattr->f_mode & S_IWUSR)
 175                 fattr->attr &= ~aRONLY;
 176         else
 177                 fattr->attr |= aRONLY;
 178 }
 179
 180 /*
 181  * Update the inode, possibly causing it to invalidate its pages if mtime/size
 182  * is different from last time.
 183  */
 184 void
 185 smb_set_inode_attr(struct inode *inode, struct smb_fattr *fattr)
 186 {
 187         struct smb_inode_info *ei = SMB_I(inode);
 188
 189         /*
 190          * A size change should have a different mtime, or same mtime
 191          * but different size.
 192          */
 193         time_t last_time = inode->i_mtime.tv_sec;
 194         loff_t last_sz = inode->i_size;
 195
 196         inode->i_mode   = fattr->f_mode;
 197         inode->i_nlink  = fattr->f_nlink;
 198         inode->i_uid    = fattr->f_uid;
 199         inode->i_gid    = fattr->f_gid;
 200         inode->i_ctime  = fattr->f_ctime;
 201         inode->i_blocks = fattr->f_blocks;
 202         inode->i_size   = fattr->f_size;
 203         inode->i_mtime  = fattr->f_mtime;
 204         inode->i_atime  = fattr->f_atime;
 205         ei->attr = fattr->attr;
 206
 207         /*
 208          * Update the "last time refreshed" field for revalidation.
 209          */
 210         ei->oldmtime = jiffies;
 211
 212         if (inode->i_mtime.tv_sec != last_time || inode->i_size != last_sz) {
 213                 VERBOSE("%ld changed, old=%ld, new=%ld, oz=%ld, nz=%ld\n",
 214                         inode->i_ino,
 215                         (long) last_time, (long) inode->i_mtime.tv_sec,
 216                         (long) last_sz, (long) inode->i_size);
 217
 218                 if (!S_ISDIR(inode->i_mode))
 219                         invalidate_remote_inode(inode);
 220         }
 221 }
 222
 223 /*
 224  * This is called if the connection has gone bad ...
 225  * try to kill off all the current inodes.
 226  */
 227 void
 228 smb_invalidate_inodes(struct smb_sb_info *server)
 229 {
 230         VERBOSE("\n");
 231         shrink_dcache_sb(SB_of(server));
 232         invalidate_inodes(SB_of(server));
 233 }
 234
 235 /*
 236  * This is called to update the inode attributes after
 237  * we've made changes to a file or directory.
 238  */
 239 static int
 240 smb_refresh_inode(struct dentry *dentry)
 241 {
 242         struct inode *inode = dentry->d_inode;
 243         int error;
 244         struct smb_fattr fattr;
 245
 246         error = smb_proc_getattr(dentry, &fattr);
 247         if (!error) {
 248                 smb_renew_times(dentry);
 249                 /*
 250                  * Check whether the type part of the mode changed,
 251                  * and don't update the attributes if it did.
 252                  *
 253                  * And don't dick with the root inode
 254                  */
 255                 if (inode->i_ino == 2)
 256                         return error;
 257                 if (S_ISLNK(inode->i_mode))
 258                         return error;   /* VFS will deal with it */
 259
 260                 if ((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT)) {
 261                         smb_set_inode_attr(inode, &fattr);
 262                 } else {
 263                         /*
 264                          * Big trouble! The inode has become a new object,
 265                          * so any operations attempted on it are invalid.
 266                          *
 267                          * To limit damage, mark the inode as bad so that
 268                          * subsequent lookup validations will fail.
 269                          */
 270                         PARANOIA("%s/%s changed mode, %07o to %07o\n",
 271                                  DENTRY_PATH(dentry),
 272                                  inode->i_mode, fattr.f_mode);
 273
 274                         fattr.f_mode = inode->i_mode; /* save mode */
 275                         make_bad_inode(inode);
 276                         inode->i_mode = fattr.f_mode; /* restore mode */
 277                         /*
 278                          * No need to worry about unhashing the dentry: the
 279                          * lookup validation will see that the inode is bad.
 280                          * But we do want to invalidate the caches ...
 281                          */
 282                         if (!S_ISDIR(inode->i_mode))
 283                                 invalidate_remote_inode(inode);
 284                         else
 285                                 smb_invalid_dir_cache(inode);
 286                         error = -EIO;
 287                 }
 288         }
 289         return error;
 290 }
 291
 292 /*
 293  * This is called when we want to check whether the inode
 294  * has changed on the server.  If it has changed, we must
 295  * invalidate our local caches.
 296  */
 297 int
 298 smb_revalidate_inode(struct dentry *dentry)
 299 {
 300         struct smb_sb_info *s = server_from_dentry(dentry);
 301         struct inode *inode = dentry->d_inode;
 302         int error = 0;
 303
 304         DEBUG1("smb_revalidate_inode\n");
 305         lock_kernel();
 306
 307         /*
 308          * Check whether we've recently refreshed the inode.
 309          */
 310         if (time_before(jiffies, SMB_I(inode)->oldmtime + SMB_MAX_AGE(s))) {
 311                 VERBOSE("up-to-date, ino=%ld, jiffies=%lu, oldtime=%lu\n",
 312                         inode->i_ino, jiffies, SMB_I(inode)->oldmtime);
 313                 goto out;
 314         }
 315
 316         error = smb_refresh_inode(dentry);
 317 out:
 318         unlock_kernel();
 319         return error;
 320 }
 321
 322 /*
 323  * This routine is called when i_nlink == 0 and i_count goes to 0.
 324  * All blocking cleanup operations need to go here to avoid races.
 325  */
 326 static void
 327 smb_delete_inode(struct inode *ino)
 328 {
 329         DEBUG1("ino=%ld\n", ino->i_ino);
 330         truncate_inode_pages(&ino->i_data, 0);
 331         lock_kernel();
 332         if (smb_close(ino))
 333                 PARANOIA("could not close inode %ld\n", ino->i_ino);
 334         unlock_kernel();
 335         clear_inode(ino);
 336 }
 337
 338 static struct option opts[] = {
 339         { "version",    0, 'v' },
 340         { "win95",      SMB_MOUNT_WIN95, 1 },
 341         { "oldattr",    SMB_MOUNT_OLDATTR, 1 },
 342         { "dirattr",    SMB_MOUNT_DIRATTR, 1 },
 343         { "case",       SMB_MOUNT_CASE, 1 },
 344         { "uid",        0, 'u' },
 345         { "gid",        0, 'g' },
 346         { "file_mode",  0, 'f' },
 347         { "dir_mode",   0, 'd' },
 348         { "iocharset",  0, 'i' },
 349         { "codepage",   0, 'c' },
 350         { "ttl",        0, 't' },
 351         { NULL,         0, 0}
 352 };
 353
 354 static int
 355 parse_options(struct smb_mount_data_kernel *mnt, char *options)
 356 {
 357         int c;
 358         unsigned long flags;
 359         unsigned long value;
 360         char *optarg;
 361         char *optopt;
 362
 363         flags = 0;
 364         while ( (c = smb_getopt("smbfs", &options, opts,
 365                                 &optopt, &optarg, &flags, &value)) > 0) {
 366
 367                 VERBOSE("'%s' -> '%s'\n", optopt, optarg ? optarg : "<none>");
 368                 switch (c) {
 369                 case 1:
 370                         /* got a "flag" option */
 371                         break;
 372                 case 'v':
 373                         if (value != SMB_MOUNT_VERSION) {
 374                         printk ("smbfs: Bad mount version %ld, expected %d\n",
 375                                 value, SMB_MOUNT_VERSION);
 376                                 return 0;
 377                         }
 378                         mnt->version = value;
 379                         break;
 380                 case 'u':
 381                         mnt->uid = value;
 382                         flags |= SMB_MOUNT_UID;
 383                         break;
 384                 case 'g':
 385                         mnt->gid = value;
 386                         flags |= SMB_MOUNT_GID;
 387                         break;
 388                 case 'f':
 389                         mnt->file_mode = (value & S_IRWXUGO) | S_IFREG;
 390                         flags |= SMB_MOUNT_FMODE;
 391                         break;
 392                 case 'd':
 393                         mnt->dir_mode = (value & S_IRWXUGO) | S_IFDIR;
 394                         flags |= SMB_MOUNT_DMODE;
 395                         break;
 396                 case 'i':
 397                         strlcpy(mnt->codepage.local_name, optarg,
 398                                 SMB_NLS_MAXNAMELEN);
 399                         break;
 400                 case 'c':
 401                         strlcpy(mnt->codepage.remote_name, optarg,
 402                                 SMB_NLS_MAXNAMELEN);
 403                         break;
 404                 case 't':
 405                         mnt->ttl = value;
 406                         break;
 407                 default:
 408                         printk ("smbfs: Unrecognized mount option %s\n",
 409                                 optopt);
 410                         return -1;
 411                 }
 412         }
 413         mnt->flags = flags;
 414         return c;
 415 }
 416
 417 /*
 418  * smb_show_options() is for displaying mount options in /proc/mounts.
 419  * It tries to avoid showing settings that were not changed from their
 420  * defaults.
 421  */
 422 static int
 423 smb_show_options(struct seq_file *s, struct vfsmount *m)
 424 {
 425         struct smb_mount_data_kernel *mnt = SMB_SB(m->mnt_sb)->mnt;
 426         int i;
 427
 428         for (i = 0; opts[i].name != NULL; i++)
 429                 if (mnt->flags & opts[i].flag)
 430                         seq_printf(s, ",%s", opts[i].name);
 431
 432         if (mnt->flags & SMB_MOUNT_UID)
 433                 seq_printf(s, ",uid=%d", mnt->uid);
 434         if (mnt->flags & SMB_MOUNT_GID)
 435                 seq_printf(s, ",gid=%d", mnt->gid);
 436         if (mnt->mounted_uid != 0)
 437                 seq_printf(s, ",mounted_uid=%d", mnt->mounted_uid);
 438
 439         /*
 440          * Defaults for file_mode and dir_mode are unknown to us; they
 441          * depend on the current umask of the user doing the mount.
 442          */
 443         if (mnt->flags & SMB_MOUNT_FMODE)
 444                 seq_printf(s, ",file_mode=%04o", mnt->file_mode & S_IRWXUGO);
 445         if (mnt->flags & SMB_MOUNT_DMODE)
 446                 seq_printf(s, ",dir_mode=%04o", mnt->dir_mode & S_IRWXUGO);
 447
 448         if (strcmp(mnt->codepage.local_name, CONFIG_NLS_DEFAULT))
 449                 seq_printf(s, ",iocharset=%s", mnt->codepage.local_name);
 450         if (strcmp(mnt->codepage.remote_name, SMB_NLS_REMOTE))
 451                 seq_printf(s, ",codepage=%s", mnt->codepage.remote_name);
 452
 453         if (mnt->ttl != SMB_TTL_DEFAULT)
 454                 seq_printf(s, ",ttl=%d", mnt->ttl);
 455
 456         return 0;
 457 }
 458
 459 static void
 460 smb_unload_nls(struct smb_sb_info *server)
 461 {
 462         if (server->remote_nls) {
 463                 unload_nls(server->remote_nls);
 464                 server->remote_nls = NULL;
 465         }
 466         if (server->local_nls) {
 467                 unload_nls(server->local_nls);
 468                 server->local_nls = NULL;
 469         }
 470 }
 471
 472 static void
 473 smb_put_super(struct super_block *sb)
 474 {
 475         struct smb_sb_info *server = SMB_SB(sb);
 476
 477         smb_lock_server(server);
 478         server->state = CONN_INVALID;
 479         smbiod_unregister_server(server);
 480
 481         smb_close_socket(server);
 482
 483         if (server->conn_pid)
 484                 kill_pid(server->conn_pid, SIGTERM, 1);
 485
 486         kfree(server->ops);
 487         smb_unload_nls(server);
 488         sb->s_fs_info = NULL;
 489         smb_unlock_server(server);
 490         put_pid(server->conn_pid);
 491         kfree(server);
 492 }
 493
 494 static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
 495 {
 496         struct smb_sb_info *server;
 497         struct smb_mount_data_kernel *mnt;
 498         struct smb_mount_data *oldmnt;
 499         struct inode *root_inode;
 500         struct smb_fattr root;
 501         int ver;
 502         void *mem;
 503         static int warn_count;
 504
 505         if (warn_count < 5) {
 506                 warn_count++;
 507                 printk(KERN_EMERG "smbfs is deprecated and will be removed"
 508                         "from the 2.6.27 kernel.  Please migrate to cifs\n");
 509         }
 510
 511         if (!raw_data)
 512                 goto out_no_data;
 513
 514         oldmnt = (struct smb_mount_data *) raw_data;
 515         ver = oldmnt->version;
 516         if (ver != SMB_MOUNT_OLDVERSION && cpu_to_be32(ver) != SMB_MOUNT_ASCII)
 517                 goto out_wrong_data;
 518
 519         sb->s_flags |= MS_NODIRATIME;
 520         sb->s_blocksize = 1024; /* Eh...  Is this correct? */
 521         sb->s_blocksize_bits = 10;
 522         sb->s_magic = SMB_SUPER_MAGIC;
 523         sb->s_op = &smb_sops;
 524         sb->s_time_gran = 100;
 525
 526         server = kzalloc(sizeof(struct smb_sb_info), GFP_KERNEL);
 527         if (!server)
 528                 goto out_no_server;
 529         sb->s_fs_info = server;
 530
 531         server->super_block = sb;
 532         server->mnt = NULL;
 533         server->sock_file = NULL;
 534         init_waitqueue_head(&server->conn_wq);
 535         init_MUTEX(&server->sem);
 536         INIT_LIST_HEAD(&server->entry);
 537         INIT_LIST_HEAD(&server->xmitq);
 538         INIT_LIST_HEAD(&server->recvq);
 539         server->conn_error = 0;
 540         server->conn_pid = NULL;
 541         server->state = CONN_INVALID; /* no connection yet */
 542         server->generation = 0;
 543
 544         /* Allocate the global temp buffer and some superblock helper structs */
 545         /* FIXME: move these to the smb_sb_info struct */
 546         VERBOSE("alloc chunk = %lu\n", sizeof(struct smb_ops) +
 547                 sizeof(struct smb_mount_data_kernel));
 548         mem = kmalloc(sizeof(struct smb_ops) +
 549                       sizeof(struct smb_mount_data_kernel), GFP_KERNEL);
 550         if (!mem)
 551                 goto out_no_mem;
 552
 553         server->ops = mem;
 554         smb_install_null_ops(server->ops);
 555         server->mnt = mem + sizeof(struct smb_ops);
 556
 557         /* Setup NLS stuff */
 558         server->remote_nls = NULL;
 559         server->local_nls = NULL;
 560
 561         mnt = server->mnt;
 562
 563         memset(mnt, 0, sizeof(struct smb_mount_data_kernel));
 564         strlcpy(mnt->codepage.local_name, CONFIG_NLS_DEFAULT,
 565                 SMB_NLS_MAXNAMELEN);
 566         strlcpy(mnt->codepage.remote_name, SMB_NLS_REMOTE,
 567                 SMB_NLS_MAXNAMELEN);
 568
 569         mnt->ttl = SMB_TTL_DEFAULT;
 570         if (ver == SMB_MOUNT_OLDVERSION) {
 571                 mnt->version = oldmnt->version;
 572
 573                 SET_UID(mnt->uid, oldmnt->uid);
 574                 SET_GID(mnt->gid, oldmnt->gid);
 575
 576                 mnt->file_mode = (oldmnt->file_mode & S_IRWXUGO) | S_IFREG;
 577                 mnt->dir_mode = (oldmnt->dir_mode & S_IRWXUGO) | S_IFDIR;
 578
 579                 mnt->flags = (oldmnt->file_mode >> 9) | SMB_MOUNT_UID |
 580                         SMB_MOUNT_GID | SMB_MOUNT_FMODE | SMB_MOUNT_DMODE;
 581         } else {
 582                 mnt->file_mode = S_IRWXU | S_IRGRP | S_IXGRP |
 583                                 S_IROTH | S_IXOTH | S_IFREG;
 584                 mnt->dir_mode = S_IRWXU | S_IRGRP | S_IXGRP |
 585                                 S_IROTH | S_IXOTH | S_IFDIR;
 586                 if (parse_options(mnt, raw_data))
 587                         goto out_bad_option;
 588         }
 589         mnt->mounted_uid = current->uid;
 590         smb_setcodepage(server, &mnt->codepage);
 591
 592         /*
 593          * Display the enabled options
 594          * Note: smb_proc_getattr uses these in 2.4 (but was changed in 2.2)
 595          */
 596         if (mnt->flags & SMB_MOUNT_OLDATTR)
 597                 printk("SMBFS: Using core getattr (Win 95 speedup)\n");
 598         else if (mnt->flags & SMB_MOUNT_DIRATTR)
 599                 printk("SMBFS: Using dir ff getattr\n");
 600
 601         if (smbiod_register_server(server) < 0) {
 602                 printk(KERN_ERR "smbfs: failed to start smbiod\n");
 603                 goto out_no_smbiod;
 604         }
 605
 606         /*
 607          * Keep the super block locked while we get the root inode.
 608          */
 609         smb_init_root_dirent(server, &root, sb);
 610         root_inode = smb_iget(sb, &root);
 611         if (!root_inode)
 612                 goto out_no_root;
 613
 614         sb->s_root = d_alloc_root(root_inode);
 615         if (!sb->s_root)
 616                 goto out_no_root;
 617
 618         smb_new_dentry(sb->s_root);
 619
 620         return 0;
 621
 622 out_no_root:
 623         iput(root_inode);
 624 out_no_smbiod:
 625         smb_unload_nls(server);
 626 out_bad_option:
 627         kfree(mem);
 628 out_no_mem:
 629         if (!server->mnt)
 630                 printk(KERN_ERR "smb_fill_super: allocation failure\n");
 631         sb->s_fs_info = NULL;
 632         kfree(server);
 633         goto out_fail;
 634 out_wrong_data:
 635         printk(KERN_ERR "smbfs: mount_data version %d is not supported\n", ver);
 636         goto out_fail;
 637 out_no_data:
 638         printk(KERN_ERR "smb_fill_super: missing data argument\n");
 639 out_fail:
 640         return -EINVAL;
 641 out_no_server:
 642         printk(KERN_ERR "smb_fill_super: cannot allocate struct smb_sb_info\n");
 643         return -ENOMEM;
 644 }
 645
 646 static int
 647 smb_statfs(struct dentry *dentry, struct kstatfs *buf)
 648 {
 649         int result;
 650
 651         lock_kernel();
 652
 653         result = smb_proc_dskattr(dentry, buf);
 654
 655         unlock_kernel();
 656
 657         buf->f_type = SMB_SUPER_MAGIC;
 658         buf->f_namelen = SMB_MAXPATHLEN;
 659         return result;
 660 }
 661
 662 int smb_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 663 {
 664         int err = smb_revalidate_inode(dentry);
 665         if (!err)
 666                 generic_fillattr(dentry->d_inode, stat);
 667         return err;
 668 }
 669
 670 int
 671 smb_notify_change(struct dentry *dentry, struct iattr *attr)
 672 {
 673         struct inode *inode = dentry->d_inode;
 674         struct smb_sb_info *server = server_from_dentry(dentry);
 675         unsigned int mask = (S_IFREG | S_IFDIR | S_IRWXUGO);
 676         int error, changed, refresh = 0;
 677         struct smb_fattr fattr;
 678
 679         lock_kernel();
 680
 681         error = smb_revalidate_inode(dentry);
 682         if (error)
 683                 goto out;
 684
 685         if ((error = inode_change_ok(inode, attr)) < 0)
 686                 goto out;
 687
 688         error = -EPERM;
 689         if ((attr->ia_valid & ATTR_UID) && (attr->ia_uid != server->mnt->uid))
 690                 goto out;
 691
 692         if ((attr->ia_valid & ATTR_GID) && (attr->ia_uid != server->mnt->gid))
 693                 goto out;
 694
 695         if ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~mask))
 696                 goto out;
 697
 698         if ((attr->ia_valid & ATTR_SIZE) != 0) {
 699                 VERBOSE("changing %s/%s, old size=%ld, new size=%ld\n",
 700                         DENTRY_PATH(dentry),
 701                         (long) inode->i_size, (long) attr->ia_size);
 702
 703                 filemap_write_and_wait(inode->i_mapping);
 704
 705                 error = smb_open(dentry, O_WRONLY);
 706                 if (error)
 707                         goto out;
 708                 error = server->ops->truncate(inode, attr->ia_size);
 709                 if (error)
 710                         goto out;
 711                 error = vmtruncate(inode, attr->ia_size);
 712                 if (error)
 713                         goto out;
 714                 refresh = 1;
 715         }
 716
 717         if (server->opt.capabilities & SMB_CAP_UNIX) {
 718                 /* For now we don't want to set the size with setattr_unix */
 719                 attr->ia_valid &= ~ATTR_SIZE;
 720                 /* FIXME: only call if we actually want to set something? */
 721                 error = smb_proc_setattr_unix(dentry, attr, 0, 0);
 722                 if (!error)
 723                         refresh = 1;
 724
 725                 goto out;
 726         }
 727
 728         /*
 729          * Initialize the fattr and check for changed fields.
 730          * Note: CTIME under SMB is creation time rather than
 731          * change time, so we don't attempt to change it.
 732          */
 733         smb_get_inode_attr(inode, &fattr);
 734
 735         changed = 0;
 736         if ((attr->ia_valid & ATTR_MTIME) != 0) {
 737                 fattr.f_mtime = attr->ia_mtime;
 738                 changed = 1;
 739         }
 740         if ((attr->ia_valid & ATTR_ATIME) != 0) {
 741                 fattr.f_atime = attr->ia_atime;
 742                 /* Earlier protocols don't have an access time */
 743                 if (server->opt.protocol >= SMB_PROTOCOL_LANMAN2)
 744                         changed = 1;
 745         }
 746         if (changed) {
 747                 error = smb_proc_settime(dentry, &fattr);
 748                 if (error)
 749                         goto out;
 750                 refresh = 1;
 751         }
 752
 753         /*
 754          * Check for mode changes ... we're extremely limited in
 755          * what can be set for SMB servers: just the read-only bit.
 756          */
 757         if ((attr->ia_valid & ATTR_MODE) != 0) {
 758                 VERBOSE("%s/%s mode change, old=%x, new=%x\n",
 759                         DENTRY_PATH(dentry), fattr.f_mode, attr->ia_mode);
 760                 changed = 0;
 761                 if (attr->ia_mode & S_IWUSR) {
 762                         if (fattr.attr & aRONLY) {
 763                                 fattr.attr &= ~aRONLY;
 764                                 changed = 1;
 765                         }
 766                 } else {
 767                         if (!(fattr.attr & aRONLY)) {
 768                                 fattr.attr |= aRONLY;
 769                                 changed = 1;
 770                         }
 771                 }
 772                 if (changed) {
 773                         error = smb_proc_setattr(dentry, &fattr);
 774                         if (error)
 775                                 goto out;
 776                         refresh = 1;
 777                 }
 778         }
 779         error = 0;
 780
 781 out:
 782         if (refresh)
 783                 smb_refresh_inode(dentry);
 784         unlock_kernel();
 785         return error;
 786 }
 787
 788 static int smb_get_sb(struct file_system_type *fs_type,
 789         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 790 {
 791         return get_sb_nodev(fs_type, flags, data, smb_fill_super, mnt);
 792 }
 793
 794 static struct file_system_type smb_fs_type = {
 795         .owner          = THIS_MODULE,
 796         .name           = "smbfs",
 797         .get_sb         = smb_get_sb,
 798         .kill_sb        = kill_anon_super,
 799         .fs_flags       = FS_BINARY_MOUNTDATA,
 800 };
 801
 802 static int __init init_smb_fs(void)
 803 {
 804         int err;
 805         DEBUG1("registering ...\n");
 806
 807         err = init_inodecache();
 808         if (err)
 809                 goto out_inode;
 810         err = smb_init_request_cache();
 811         if (err)
 812                 goto out_request;
 813         err = register_filesystem(&smb_fs_type);
 814         if (err)
 815                 goto out;
 816         return 0;
 817 out:
 818         smb_destroy_request_cache();
 819 out_request:
 820         destroy_inodecache();
 821 out_inode:
 822         return err;
 823 }
 824
 825 static void __exit exit_smb_fs(void)
 826 {
 827         DEBUG1("unregistering ...\n");
 828         unregister_filesystem(&smb_fs_type);
 829         smb_destroy_request_cache();
 830         destroy_inodecache();
 831 }
 832
 833 module_init(init_smb_fs)
 834 module_exit(exit_smb_fs)
 835 MODULE_LICENSE("GPL");