release/src-rt-6.x.4708/linux/linux-2.6.36/fs/smbfs/inode.c

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