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