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