fs/qnx6/inode.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * QNX6 file system, Linux implementation.
   4  *
   5  * Version : 1.0.0
   6  *
   7  * History :
   8  *
   9  * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
  10  * 16-02-2012 pagemap extension by Al Viro
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/highuid.h>
  18 #include <linux/pagemap.h>
  19 #include <linux/buffer_head.h>
  20 #include <linux/writeback.h>
  21 #include <linux/statfs.h>
  22 #include <linux/parser.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/mount.h>
  25 #include <linux/crc32.h>
  26 #include <linux/mpage.h>
  27 #include "qnx6.h"
  28
  29 static const struct super_operations qnx6_sops;
  30
  31 static void qnx6_put_super(struct super_block *sb);
  32 static struct inode *qnx6_alloc_inode(struct super_block *sb);
  33 static void qnx6_free_inode(struct inode *inode);
  34 static int qnx6_remount(struct super_block *sb, int *flags, char *data);
  35 static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf);
  36 static int qnx6_show_options(struct seq_file *seq, struct dentry *root);
  37
  38 static const struct super_operations qnx6_sops = {
  39         .alloc_inode    = qnx6_alloc_inode,
  40         .free_inode     = qnx6_free_inode,
  41         .put_super      = qnx6_put_super,
  42         .statfs         = qnx6_statfs,
  43         .remount_fs     = qnx6_remount,
  44         .show_options   = qnx6_show_options,
  45 };
  46
  47 static int qnx6_show_options(struct seq_file *seq, struct dentry *root)
  48 {
  49         struct super_block *sb = root->d_sb;
  50         struct qnx6_sb_info *sbi = QNX6_SB(sb);
  51
  52         if (sbi->s_mount_opt & QNX6_MOUNT_MMI_FS)
  53                 seq_puts(seq, ",mmi_fs");
  54         return 0;
  55 }
  56
  57 static int qnx6_remount(struct super_block *sb, int *flags, char *data)
  58 {
  59         sync_filesystem(sb);
  60         *flags |= SB_RDONLY;
  61         return 0;
  62 }
  63
  64 static unsigned qnx6_get_devblock(struct super_block *sb, __fs32 block)
  65 {
  66         struct qnx6_sb_info *sbi = QNX6_SB(sb);
  67         return fs32_to_cpu(sbi, block) + sbi->s_blks_off;
  68 }
  69
  70 static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);
  71
  72 static int qnx6_get_block(struct inode *inode, sector_t iblock,
  73                         struct buffer_head *bh, int create)
  74 {
  75         unsigned phys;
  76
  77         pr_debug("qnx6_get_block inode=[%ld] iblock=[%ld]\n",
  78                  inode->i_ino, (unsigned long)iblock);
  79
  80         phys = qnx6_block_map(inode, iblock);
  81         if (phys) {
  82                 /* logical block is before EOF */
  83                 map_bh(bh, inode->i_sb, phys);
  84         }
  85         return 0;
  86 }
  87
  88 static int qnx6_check_blockptr(__fs32 ptr)
  89 {
  90         if (ptr == ~(__fs32)0) {
  91                 pr_err("hit unused blockpointer.\n");
  92                 return 0;
  93         }
  94         return 1;
  95 }
  96
  97 static int qnx6_readpage(struct file *file, struct page *page)
  98 {
  99         return mpage_readpage(page, qnx6_get_block);
 100 }
 101
 102 static void qnx6_readahead(struct readahead_control *rac)
 103 {
 104         mpage_readahead(rac, qnx6_get_block);
 105 }
 106
 107 /*
 108  * returns the block number for the no-th element in the tree
 109  * inodebits requred as there are multiple inodes in one inode block
 110  */
 111 static unsigned qnx6_block_map(struct inode *inode, unsigned no)
 112 {
 113         struct super_block *s = inode->i_sb;
 114         struct qnx6_sb_info *sbi = QNX6_SB(s);
 115         struct qnx6_inode_info *ei = QNX6_I(inode);
 116         unsigned block = 0;
 117         struct buffer_head *bh;
 118         __fs32 ptr;
 119         int levelptr;
 120         int ptrbits = sbi->s_ptrbits;
 121         int bitdelta;
 122         u32 mask = (1 << ptrbits) - 1;
 123         int depth = ei->di_filelevels;
 124         int i;
 125
 126         bitdelta = ptrbits * depth;
 127         levelptr = no >> bitdelta;
 128
 129         if (levelptr > QNX6_NO_DIRECT_POINTERS - 1) {
 130                 pr_err("Requested file block number (%u) too big.", no);
 131                 return 0;
 132         }
 133
 134         block = qnx6_get_devblock(s, ei->di_block_ptr[levelptr]);
 135
 136         for (i = 0; i < depth; i++) {
 137                 bh = sb_bread(s, block);
 138                 if (!bh) {
 139                         pr_err("Error reading block (%u)\n", block);
 140                         return 0;
 141                 }
 142                 bitdelta -= ptrbits;
 143                 levelptr = (no >> bitdelta) & mask;
 144                 ptr = ((__fs32 *)bh->b_data)[levelptr];
 145
 146                 if (!qnx6_check_blockptr(ptr))
 147                         return 0;
 148
 149                 block = qnx6_get_devblock(s, ptr);
 150                 brelse(bh);
 151         }
 152         return block;
 153 }
 154
 155 static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf)
 156 {
 157         struct super_block *sb = dentry->d_sb;
 158         struct qnx6_sb_info *sbi = QNX6_SB(sb);
 159         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 160
 161         buf->f_type    = sb->s_magic;
 162         buf->f_bsize   = sb->s_blocksize;
 163         buf->f_blocks  = fs32_to_cpu(sbi, sbi->sb->sb_num_blocks);
 164         buf->f_bfree   = fs32_to_cpu(sbi, sbi->sb->sb_free_blocks);
 165         buf->f_files   = fs32_to_cpu(sbi, sbi->sb->sb_num_inodes);
 166         buf->f_ffree   = fs32_to_cpu(sbi, sbi->sb->sb_free_inodes);
 167         buf->f_bavail  = buf->f_bfree;
 168         buf->f_namelen = QNX6_LONG_NAME_MAX;
 169         buf->f_fsid.val[0] = (u32)id;
 170         buf->f_fsid.val[1] = (u32)(id >> 32);
 171
 172         return 0;
 173 }
 174
 175 /*
 176  * Check the root directory of the filesystem to make sure
 177  * it really _is_ a qnx6 filesystem, and to check the size
 178  * of the directory entry.
 179  */
 180 static const char *qnx6_checkroot(struct super_block *s)
 181 {
 182         static char match_root[2][3] = {".\0\0", "..\0"};
 183         int i, error = 0;
 184         struct qnx6_dir_entry *dir_entry;
 185         struct inode *root = d_inode(s->s_root);
 186         struct address_space *mapping = root->i_mapping;
 187         struct page *page = read_mapping_page(mapping, 0, NULL);
 188         if (IS_ERR(page))
 189                 return "error reading root directory";
 190         kmap(page);
 191         dir_entry = page_address(page);
 192         for (i = 0; i < 2; i++) {
 193                 /* maximum 3 bytes - due to match_root limitation */
 194                 if (strncmp(dir_entry[i].de_fname, match_root[i], 3))
 195                         error = 1;
 196         }
 197         qnx6_put_page(page);
 198         if (error)
 199                 return "error reading root directory.";
 200         return NULL;
 201 }
 202
 203 #ifdef CONFIG_QNX6FS_DEBUG
 204 void qnx6_superblock_debug(struct qnx6_super_block *sb, struct super_block *s)
 205 {
 206         struct qnx6_sb_info *sbi = QNX6_SB(s);
 207
 208         pr_debug("magic: %08x\n", fs32_to_cpu(sbi, sb->sb_magic));
 209         pr_debug("checksum: %08x\n", fs32_to_cpu(sbi, sb->sb_checksum));
 210         pr_debug("serial: %llx\n", fs64_to_cpu(sbi, sb->sb_serial));
 211         pr_debug("flags: %08x\n", fs32_to_cpu(sbi, sb->sb_flags));
 212         pr_debug("blocksize: %08x\n", fs32_to_cpu(sbi, sb->sb_blocksize));
 213         pr_debug("num_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_num_inodes));
 214         pr_debug("free_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_free_inodes));
 215         pr_debug("num_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_num_blocks));
 216         pr_debug("free_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_free_blocks));
 217         pr_debug("inode_levels: %02x\n", sb->Inode.levels);
 218 }
 219 #endif
 220
 221 enum {
 222         Opt_mmifs,
 223         Opt_err
 224 };
 225
 226 static const match_table_t tokens = {
 227         {Opt_mmifs, "mmi_fs"},
 228         {Opt_err, NULL}
 229 };
 230
 231 static int qnx6_parse_options(char *options, struct super_block *sb)
 232 {
 233         char *p;
 234         struct qnx6_sb_info *sbi = QNX6_SB(sb);
 235         substring_t args[MAX_OPT_ARGS];
 236
 237         if (!options)
 238                 return 1;
 239
 240         while ((p = strsep(&options, ",")) != NULL) {
 241                 int token;
 242                 if (!*p)
 243                         continue;
 244
 245                 token = match_token(p, tokens, args);
 246                 switch (token) {
 247                 case Opt_mmifs:
 248                         set_opt(sbi->s_mount_opt, MMI_FS);
 249                         break;
 250                 default:
 251                         return 0;
 252                 }
 253         }
 254         return 1;
 255 }
 256
 257 static struct buffer_head *qnx6_check_first_superblock(struct super_block *s,
 258                                 int offset, int silent)
 259 {
 260         struct qnx6_sb_info *sbi = QNX6_SB(s);
 261         struct buffer_head *bh;
 262         struct qnx6_super_block *sb;
 263
 264         /* Check the superblock signatures
 265            start with the first superblock */
 266         bh = sb_bread(s, offset);
 267         if (!bh) {
 268                 pr_err("unable to read the first superblock\n");
 269                 return NULL;
 270         }
 271         sb = (struct qnx6_super_block *)bh->b_data;
 272         if (fs32_to_cpu(sbi, sb->sb_magic) != QNX6_SUPER_MAGIC) {
 273                 sbi->s_bytesex = BYTESEX_BE;
 274                 if (fs32_to_cpu(sbi, sb->sb_magic) == QNX6_SUPER_MAGIC) {
 275                         /* we got a big endian fs */
 276                         pr_debug("fs got different endianness.\n");
 277                         return bh;
 278                 } else
 279                         sbi->s_bytesex = BYTESEX_LE;
 280                 if (!silent) {
 281                         if (offset == 0) {
 282                                 pr_err("wrong signature (magic) in superblock #1.\n");
 283                         } else {
 284                                 pr_info("wrong signature (magic) at position (0x%lx) - will try alternative position (0x0000).\n",
 285                                         offset * s->s_blocksize);
 286                         }
 287                 }
 288                 brelse(bh);
 289                 return NULL;
 290         }
 291         return bh;
 292 }
 293
 294 static struct inode *qnx6_private_inode(struct super_block *s,
 295                                         struct qnx6_root_node *p);
 296
 297 static int qnx6_fill_super(struct super_block *s, void *data, int silent)
 298 {
 299         struct buffer_head *bh1 = NULL, *bh2 = NULL;
 300         struct qnx6_super_block *sb1 = NULL, *sb2 = NULL;
 301         struct qnx6_sb_info *sbi;
 302         struct inode *root;
 303         const char *errmsg;
 304         struct qnx6_sb_info *qs;
 305         int ret = -EINVAL;
 306         u64 offset;
 307         int bootblock_offset = QNX6_BOOTBLOCK_SIZE;
 308
 309         qs = kzalloc(sizeof(struct qnx6_sb_info), GFP_KERNEL);
 310         if (!qs)
 311                 return -ENOMEM;
 312         s->s_fs_info = qs;
 313
 314         /* Superblock always is 512 Byte long */
 315         if (!sb_set_blocksize(s, QNX6_SUPERBLOCK_SIZE)) {
 316                 pr_err("unable to set blocksize\n");
 317                 goto outnobh;
 318         }
 319
 320         /* parse the mount-options */
 321         if (!qnx6_parse_options((char *) data, s)) {
 322                 pr_err("invalid mount options.\n");
 323                 goto outnobh;
 324         }
 325         if (test_opt(s, MMI_FS)) {
 326                 sb1 = qnx6_mmi_fill_super(s, silent);
 327                 if (sb1)
 328                         goto mmi_success;
 329                 else
 330                         goto outnobh;
 331         }
 332         sbi = QNX6_SB(s);
 333         sbi->s_bytesex = BYTESEX_LE;
 334         /* Check the superblock signatures
 335            start with the first superblock */
 336         bh1 = qnx6_check_first_superblock(s,
 337                 bootblock_offset / QNX6_SUPERBLOCK_SIZE, silent);
 338         if (!bh1) {
 339                 /* try again without bootblock offset */
 340                 bh1 = qnx6_check_first_superblock(s, 0, silent);
 341                 if (!bh1) {
 342                         pr_err("unable to read the first superblock\n");
 343                         goto outnobh;
 344                 }
 345                 /* seems that no bootblock at partition start */
 346                 bootblock_offset = 0;
 347         }
 348         sb1 = (struct qnx6_super_block *)bh1->b_data;
 349
 350 #ifdef CONFIG_QNX6FS_DEBUG
 351         qnx6_superblock_debug(sb1, s);
 352 #endif
 353
 354         /* checksum check - start at byte 8 and end at byte 512 */
 355         if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
 356                         crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
 357                 pr_err("superblock #1 checksum error\n");
 358                 goto out;
 359         }
 360
 361         /* set new blocksize */
 362         if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
 363                 pr_err("unable to set blocksize\n");
 364                 goto out;
 365         }
 366         /* blocksize invalidates bh - pull it back in */
 367         brelse(bh1);
 368         bh1 = sb_bread(s, bootblock_offset >> s->s_blocksize_bits);
 369         if (!bh1)
 370                 goto outnobh;
 371         sb1 = (struct qnx6_super_block *)bh1->b_data;
 372
 373         /* calculate second superblock blocknumber */
 374         offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) +
 375                 (bootblock_offset >> s->s_blocksize_bits) +
 376                 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
 377
 378         /* set bootblock offset */
 379         sbi->s_blks_off = (bootblock_offset >> s->s_blocksize_bits) +
 380                           (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
 381
 382         /* next the second superblock */
 383         bh2 = sb_bread(s, offset);
 384         if (!bh2) {
 385                 pr_err("unable to read the second superblock\n");
 386                 goto out;
 387         }
 388         sb2 = (struct qnx6_super_block *)bh2->b_data;
 389         if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
 390                 if (!silent)
 391                         pr_err("wrong signature (magic) in superblock #2.\n");
 392                 goto out;
 393         }
 394
 395         /* checksum check - start at byte 8 and end at byte 512 */
 396         if (fs32_to_cpu(sbi, sb2->sb_checksum) !=
 397                                 crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
 398                 pr_err("superblock #2 checksum error\n");
 399                 goto out;
 400         }
 401
 402         if (fs64_to_cpu(sbi, sb1->sb_serial) >=
 403                                         fs64_to_cpu(sbi, sb2->sb_serial)) {
 404                 /* superblock #1 active */
 405                 sbi->sb_buf = bh1;
 406                 sbi->sb = (struct qnx6_super_block *)bh1->b_data;
 407                 brelse(bh2);
 408                 pr_info("superblock #1 active\n");
 409         } else {
 410                 /* superblock #2 active */
 411                 sbi->sb_buf = bh2;
 412                 sbi->sb = (struct qnx6_super_block *)bh2->b_data;
 413                 brelse(bh1);
 414                 pr_info("superblock #2 active\n");
 415         }
 416 mmi_success:
 417         /* sanity check - limit maximum indirect pointer levels */
 418         if (sb1->Inode.levels > QNX6_PTR_MAX_LEVELS) {
 419                 pr_err("too many inode levels (max %i, sb %i)\n",
 420                        QNX6_PTR_MAX_LEVELS, sb1->Inode.levels);
 421                 goto out;
 422         }
 423         if (sb1->Longfile.levels > QNX6_PTR_MAX_LEVELS) {
 424                 pr_err("too many longfilename levels (max %i, sb %i)\n",
 425                        QNX6_PTR_MAX_LEVELS, sb1->Longfile.levels);
 426                 goto out;
 427         }
 428         s->s_op = &qnx6_sops;
 429         s->s_magic = QNX6_SUPER_MAGIC;
 430         s->s_flags |= SB_RDONLY;        /* Yup, read-only yet */
 431         s->s_time_min = 0;
 432         s->s_time_max = U32_MAX;
 433
 434         /* ease the later tree level calculations */
 435         sbi = QNX6_SB(s);
 436         sbi->s_ptrbits = ilog2(s->s_blocksize / 4);
 437         sbi->inodes = qnx6_private_inode(s, &sb1->Inode);
 438         if (!sbi->inodes)
 439                 goto out;
 440         sbi->longfile = qnx6_private_inode(s, &sb1->Longfile);
 441         if (!sbi->longfile)
 442                 goto out1;
 443
 444         /* prefetch root inode */
 445         root = qnx6_iget(s, QNX6_ROOT_INO);
 446         if (IS_ERR(root)) {
 447                 pr_err("get inode failed\n");
 448                 ret = PTR_ERR(root);
 449                 goto out2;
 450         }
 451
 452         ret = -ENOMEM;
 453         s->s_root = d_make_root(root);
 454         if (!s->s_root)
 455                 goto out2;
 456
 457         ret = -EINVAL;
 458         errmsg = qnx6_checkroot(s);
 459         if (errmsg != NULL) {
 460                 if (!silent)
 461                         pr_err("%s\n", errmsg);
 462                 goto out3;
 463         }
 464         return 0;
 465
 466 out3:
 467         dput(s->s_root);
 468         s->s_root = NULL;
 469 out2:
 470         iput(sbi->longfile);
 471 out1:
 472         iput(sbi->inodes);
 473 out:
 474         if (bh1)
 475                 brelse(bh1);
 476         if (bh2)
 477                 brelse(bh2);
 478 outnobh:
 479         kfree(qs);
 480         s->s_fs_info = NULL;
 481         return ret;
 482 }
 483
 484 static void qnx6_put_super(struct super_block *sb)
 485 {
 486         struct qnx6_sb_info *qs = QNX6_SB(sb);
 487         brelse(qs->sb_buf);
 488         iput(qs->longfile);
 489         iput(qs->inodes);
 490         kfree(qs);
 491         sb->s_fs_info = NULL;
 492         return;
 493 }
 494
 495 static sector_t qnx6_bmap(struct address_space *mapping, sector_t block)
 496 {
 497         return generic_block_bmap(mapping, block, qnx6_get_block);
 498 }
 499 static const struct address_space_operations qnx6_aops = {
 500         .readpage       = qnx6_readpage,
 501         .readahead      = qnx6_readahead,
 502         .bmap           = qnx6_bmap
 503 };
 504
 505 static struct inode *qnx6_private_inode(struct super_block *s,
 506                                         struct qnx6_root_node *p)
 507 {
 508         struct inode *inode = new_inode(s);
 509         if (inode) {
 510                 struct qnx6_inode_info *ei = QNX6_I(inode);
 511                 struct qnx6_sb_info *sbi = QNX6_SB(s);
 512                 inode->i_size = fs64_to_cpu(sbi, p->size);
 513                 memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr));
 514                 ei->di_filelevels = p->levels;
 515                 inode->i_mode = S_IFREG | S_IRUSR; /* probably wrong */
 516                 inode->i_mapping->a_ops = &qnx6_aops;
 517         }
 518         return inode;
 519 }
 520
 521 struct inode *qnx6_iget(struct super_block *sb, unsigned ino)
 522 {
 523         struct qnx6_sb_info *sbi = QNX6_SB(sb);
 524         struct qnx6_inode_entry *raw_inode;
 525         struct inode *inode;
 526         struct qnx6_inode_info  *ei;
 527         struct address_space *mapping;
 528         struct page *page;
 529         u32 n, offs;
 530
 531         inode = iget_locked(sb, ino);
 532         if (!inode)
 533                 return ERR_PTR(-ENOMEM);
 534         if (!(inode->i_state & I_NEW))
 535                 return inode;
 536
 537         ei = QNX6_I(inode);
 538
 539         inode->i_mode = 0;
 540
 541         if (ino == 0) {
 542                 pr_err("bad inode number on dev %s: %u is out of range\n",
 543                        sb->s_id, ino);
 544                 iget_failed(inode);
 545                 return ERR_PTR(-EIO);
 546         }
 547         n = (ino - 1) >> (PAGE_SHIFT - QNX6_INODE_SIZE_BITS);
 548         offs = (ino - 1) & (~PAGE_MASK >> QNX6_INODE_SIZE_BITS);
 549         mapping = sbi->inodes->i_mapping;
 550         page = read_mapping_page(mapping, n, NULL);
 551         if (IS_ERR(page)) {
 552                 pr_err("major problem: unable to read inode from dev %s\n",
 553                        sb->s_id);
 554                 iget_failed(inode);
 555                 return ERR_CAST(page);
 556         }
 557         kmap(page);
 558         raw_inode = ((struct qnx6_inode_entry *)page_address(page)) + offs;
 559
 560         inode->i_mode    = fs16_to_cpu(sbi, raw_inode->di_mode);
 561         i_uid_write(inode, (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid));
 562         i_gid_write(inode, (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid));
 563         inode->i_size    = fs64_to_cpu(sbi, raw_inode->di_size);
 564         inode->i_mtime.tv_sec   = fs32_to_cpu(sbi, raw_inode->di_mtime);
 565         inode->i_mtime.tv_nsec = 0;
 566         inode->i_atime.tv_sec   = fs32_to_cpu(sbi, raw_inode->di_atime);
 567         inode->i_atime.tv_nsec = 0;
 568         inode->i_ctime.tv_sec   = fs32_to_cpu(sbi, raw_inode->di_ctime);
 569         inode->i_ctime.tv_nsec = 0;
 570
 571         /* calc blocks based on 512 byte blocksize */
 572         inode->i_blocks = (inode->i_size + 511) >> 9;
 573
 574         memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr,
 575                                 sizeof(raw_inode->di_block_ptr));
 576         ei->di_filelevels = raw_inode->di_filelevels;
 577
 578         if (S_ISREG(inode->i_mode)) {
 579                 inode->i_fop = &generic_ro_fops;
 580                 inode->i_mapping->a_ops = &qnx6_aops;
 581         } else if (S_ISDIR(inode->i_mode)) {
 582                 inode->i_op = &qnx6_dir_inode_operations;
 583                 inode->i_fop = &qnx6_dir_operations;
 584                 inode->i_mapping->a_ops = &qnx6_aops;
 585         } else if (S_ISLNK(inode->i_mode)) {
 586                 inode->i_op = &page_symlink_inode_operations;
 587                 inode_nohighmem(inode);
 588                 inode->i_mapping->a_ops = &qnx6_aops;
 589         } else
 590                 init_special_inode(inode, inode->i_mode, 0);
 591         qnx6_put_page(page);
 592         unlock_new_inode(inode);
 593         return inode;
 594 }
 595
 596 static struct kmem_cache *qnx6_inode_cachep;
 597
 598 static struct inode *qnx6_alloc_inode(struct super_block *sb)
 599 {
 600         struct qnx6_inode_info *ei;
 601         ei = kmem_cache_alloc(qnx6_inode_cachep, GFP_KERNEL);
 602         if (!ei)
 603                 return NULL;
 604         return &ei->vfs_inode;
 605 }
 606
 607 static void qnx6_free_inode(struct inode *inode)
 608 {
 609         kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
 610 }
 611
 612 static void init_once(void *foo)
 613 {
 614         struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo;
 615
 616         inode_init_once(&ei->vfs_inode);
 617 }
 618
 619 static int init_inodecache(void)
 620 {
 621         qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache",
 622                                              sizeof(struct qnx6_inode_info),
 623                                              0, (SLAB_RECLAIM_ACCOUNT|
 624                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 625                                              init_once);
 626         if (!qnx6_inode_cachep)
 627                 return -ENOMEM;
 628         return 0;
 629 }
 630
 631 static void destroy_inodecache(void)
 632 {
 633         /*
 634          * Make sure all delayed rcu free inodes are flushed before we
 635          * destroy cache.
 636          */
 637         rcu_barrier();
 638         kmem_cache_destroy(qnx6_inode_cachep);
 639 }
 640
 641 static struct dentry *qnx6_mount(struct file_system_type *fs_type,
 642         int flags, const char *dev_name, void *data)
 643 {
 644         return mount_bdev(fs_type, flags, dev_name, data, qnx6_fill_super);
 645 }
 646
 647 static struct file_system_type qnx6_fs_type = {
 648         .owner          = THIS_MODULE,
 649         .name           = "qnx6",
 650         .mount          = qnx6_mount,
 651         .kill_sb        = kill_block_super,
 652         .fs_flags       = FS_REQUIRES_DEV,
 653 };
 654 MODULE_ALIAS_FS("qnx6");
 655
 656 static int __init init_qnx6_fs(void)
 657 {
 658         int err;
 659
 660         err = init_inodecache();
 661         if (err)
 662                 return err;
 663
 664         err = register_filesystem(&qnx6_fs_type);
 665         if (err) {
 666                 destroy_inodecache();
 667                 return err;
 668         }
 669
 670         pr_info("QNX6 filesystem 1.0.0 registered.\n");
 671         return 0;
 672 }
 673
 674 static void __exit exit_qnx6_fs(void)
 675 {
 676         unregister_filesystem(&qnx6_fs_type);
 677         destroy_inodecache();
 678 }
 679
 680 module_init(init_qnx6_fs)
 681 module_exit(exit_qnx6_fs)
 682 MODULE_LICENSE("GPL");