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