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