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