Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/fs/qnx6/inode.c

  1 /*
  2  * QNX6 file system, Linux implementation.
  3  *
  4  * Version : 1.0.0
  5  *
  6  * History :
  7  *
  8  * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
  9  * 16-02-2012 pagemap extension by Al Viro
 10  *
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/init.h>
 15 #include <linux/slab.h>
 16 #include <linux/highuid.h>
 17 #include <linux/pagemap.h>
 18 #include <linux/buffer_head.h>
 19 #include <linux/writeback.h>
 20 #include <linux/statfs.h>
 21 #include <linux/parser.h>
 22 #include <linux/seq_file.h>
 23 #include <linux/mount.h>
 24 #include <linux/crc32.h>
 25 #include <linux/mpage.h>
 26 #include "qnx6.h"
 27 
 28 static const struct super_operations qnx6_sops;
 29 
 30 static void qnx6_put_super(struct super_block *sb);
 31 static struct inode *qnx6_alloc_inode(struct super_block *sb);
 32 static void qnx6_destroy_inode(struct inode *inode);
 33 static int qnx6_remount(struct super_block *sb, int *flags, char *data);
 34 static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf);
 35 static int qnx6_show_options(struct seq_file *seq, struct dentry *root);
 36 
 37 static const struct super_operations qnx6_sops = {
 38         .alloc_inode    = qnx6_alloc_inode,
 39         .destroy_inode  = qnx6_destroy_inode,
 40         .put_super      = qnx6_put_super,
 41         .statfs         = qnx6_statfs,
 42         .remount_fs     = qnx6_remount,
 43         .show_options   = qnx6_show_options,
 44 };
 45 
 46 static int qnx6_show_options(struct seq_file *seq, struct dentry *root)
 47 {
 48         struct super_block *sb = root->d_sb;
 49         struct qnx6_sb_info *sbi = QNX6_SB(sb);
 50 
 51         if (sbi->s_mount_opt & QNX6_MOUNT_MMI_FS)
 52                 seq_puts(seq, ",mmi_fs");
 53         return 0;
 54 }
 55 
 56 static int qnx6_remount(struct super_block *sb, int *flags, char *data)
 57 {
 58         sync_filesystem(sb);
 59         *flags |= MS_RDONLY;
 60         return 0;
 61 }
 62 
 63 static unsigned qnx6_get_devblock(struct super_block *sb, __fs32 block)
 64 {
 65         struct qnx6_sb_info *sbi = QNX6_SB(sb);
 66         return fs32_to_cpu(sbi, block) + sbi->s_blks_off;
 67 }
 68 
 69 static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);
 70 
 71 static int qnx6_get_block(struct inode *inode, sector_t iblock,
 72                         struct buffer_head *bh, int create)
 73 {
 74         unsigned phys;
 75 
 76         pr_debug("qnx6_get_block inode=[%ld] iblock=[%ld]\n",
 77                  inode->i_ino, (unsigned long)iblock);
 78 
 79         phys = qnx6_block_map(inode, iblock);
 80         if (phys) {
 81                 /* logical block is before EOF */
 82                 map_bh(bh, inode->i_sb, phys);
 83         }
 84         return 0;
 85 }
 86 
 87 static int qnx6_check_blockptr(__fs32 ptr)
 88 {
 89         if (ptr == ~(__fs32)0) {
 90                 pr_err("hit unused blockpointer.\n");
 91                 return 0;
 92         }
 93         return 1;
 94 }
 95 
 96 static int qnx6_readpage(struct file *file, struct page *page)
 97 {
 98         return mpage_readpage(page, qnx6_get_block);
 99 }
100 
101 static int qnx6_readpages(struct file *file, struct address_space *mapping,
102                    struct list_head *pages, unsigned nr_pages)
103 {
104         return mpage_readpages(mapping, pages, nr_pages, 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 = s->s_root->d_inode;
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 |= MS_RDONLY;        /* Yup, read-only yet */
431 
432         /* ease the later tree level calculations */
433         sbi = QNX6_SB(s);
434         sbi->s_ptrbits = ilog2(s->s_blocksize / 4);
435         sbi->inodes = qnx6_private_inode(s, &sb1->Inode);
436         if (!sbi->inodes)
437                 goto out;
438         sbi->longfile = qnx6_private_inode(s, &sb1->Longfile);
439         if (!sbi->longfile)
440                 goto out1;
441 
442         /* prefetch root inode */
443         root = qnx6_iget(s, QNX6_ROOT_INO);
444         if (IS_ERR(root)) {
445                 pr_err("get inode failed\n");
446                 ret = PTR_ERR(root);
447                 goto out2;
448         }
449 
450         ret = -ENOMEM;
451         s->s_root = d_make_root(root);
452         if (!s->s_root)
453                 goto out2;
454 
455         ret = -EINVAL;
456         errmsg = qnx6_checkroot(s);
457         if (errmsg != NULL) {
458                 if (!silent)
459                         pr_err("%s\n", errmsg);
460                 goto out3;
461         }
462         return 0;
463 
464 out3:
465         dput(s->s_root);
466         s->s_root = NULL;
467 out2:
468         iput(sbi->longfile);
469 out1:
470         iput(sbi->inodes);
471 out:
472         if (bh1)
473                 brelse(bh1);
474         if (bh2)
475                 brelse(bh2);
476 outnobh:
477         kfree(qs);
478         s->s_fs_info = NULL;
479         return ret;
480 }
481 
482 static void qnx6_put_super(struct super_block *sb)
483 {
484         struct qnx6_sb_info *qs = QNX6_SB(sb);
485         brelse(qs->sb_buf);
486         iput(qs->longfile);
487         iput(qs->inodes);
488         kfree(qs);
489         sb->s_fs_info = NULL;
490         return;
491 }
492 
493 static sector_t qnx6_bmap(struct address_space *mapping, sector_t block)
494 {
495         return generic_block_bmap(mapping, block, qnx6_get_block);
496 }
497 static const struct address_space_operations qnx6_aops = {
498         .readpage       = qnx6_readpage,
499         .readpages      = qnx6_readpages,
500         .bmap           = qnx6_bmap
501 };
502 
503 static struct inode *qnx6_private_inode(struct super_block *s,
504                                         struct qnx6_root_node *p)
505 {
506         struct inode *inode = new_inode(s);
507         if (inode) {
508                 struct qnx6_inode_info *ei = QNX6_I(inode);
509                 struct qnx6_sb_info *sbi = QNX6_SB(s);
510                 inode->i_size = fs64_to_cpu(sbi, p->size);
511                 memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr));
512                 ei->di_filelevels = p->levels;
513                 inode->i_mode = S_IFREG | S_IRUSR; /* probably wrong */
514                 inode->i_mapping->a_ops = &qnx6_aops;
515         }
516         return inode;
517 }
518 
519 struct inode *qnx6_iget(struct super_block *sb, unsigned ino)
520 {
521         struct qnx6_sb_info *sbi = QNX6_SB(sb);
522         struct qnx6_inode_entry *raw_inode;
523         struct inode *inode;
524         struct qnx6_inode_info  *ei;
525         struct address_space *mapping;
526         struct page *page;
527         u32 n, offs;
528 
529         inode = iget_locked(sb, ino);
530         if (!inode)
531                 return ERR_PTR(-ENOMEM);
532         if (!(inode->i_state & I_NEW))
533                 return inode;
534 
535         ei = QNX6_I(inode);
536 
537         inode->i_mode = 0;
538 
539         if (ino == 0) {
540                 pr_err("bad inode number on dev %s: %u is out of range\n",
541                        sb->s_id, ino);
542                 iget_failed(inode);
543                 return ERR_PTR(-EIO);
544         }
545         n = (ino - 1) >> (PAGE_CACHE_SHIFT - QNX6_INODE_SIZE_BITS);
546         offs = (ino - 1) & (~PAGE_CACHE_MASK >> QNX6_INODE_SIZE_BITS);
547         mapping = sbi->inodes->i_mapping;
548         page = read_mapping_page(mapping, n, NULL);
549         if (IS_ERR(page)) {
550                 pr_err("major problem: unable to read inode from dev %s\n",
551                        sb->s_id);
552                 iget_failed(inode);
553                 return ERR_CAST(page);
554         }
555         kmap(page);
556         raw_inode = ((struct qnx6_inode_entry *)page_address(page)) + offs;
557 
558         inode->i_mode    = fs16_to_cpu(sbi, raw_inode->di_mode);
559         i_uid_write(inode, (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid));
560         i_gid_write(inode, (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid));
561         inode->i_size    = fs64_to_cpu(sbi, raw_inode->di_size);
562         inode->i_mtime.tv_sec   = fs32_to_cpu(sbi, raw_inode->di_mtime);
563         inode->i_mtime.tv_nsec = 0;
564         inode->i_atime.tv_sec   = fs32_to_cpu(sbi, raw_inode->di_atime);
565         inode->i_atime.tv_nsec = 0;
566         inode->i_ctime.tv_sec   = fs32_to_cpu(sbi, raw_inode->di_ctime);
567         inode->i_ctime.tv_nsec = 0;
568 
569         /* calc blocks based on 512 byte blocksize */
570         inode->i_blocks = (inode->i_size + 511) >> 9;
571 
572         memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr,
573                                 sizeof(raw_inode->di_block_ptr));
574         ei->di_filelevels = raw_inode->di_filelevels;
575 
576         if (S_ISREG(inode->i_mode)) {
577                 inode->i_fop = &generic_ro_fops;
578                 inode->i_mapping->a_ops = &qnx6_aops;
579         } else if (S_ISDIR(inode->i_mode)) {
580                 inode->i_op = &qnx6_dir_inode_operations;
581                 inode->i_fop = &qnx6_dir_operations;
582                 inode->i_mapping->a_ops = &qnx6_aops;
583         } else if (S_ISLNK(inode->i_mode)) {
584                 inode->i_op = &page_symlink_inode_operations;
585                 inode->i_mapping->a_ops = &qnx6_aops;
586         } else
587                 init_special_inode(inode, inode->i_mode, 0);
588         qnx6_put_page(page);
589         unlock_new_inode(inode);
590         return inode;
591 }
592 
593 static struct kmem_cache *qnx6_inode_cachep;
594 
595 static struct inode *qnx6_alloc_inode(struct super_block *sb)
596 {
597         struct qnx6_inode_info *ei;
598         ei = kmem_cache_alloc(qnx6_inode_cachep, GFP_KERNEL);
599         if (!ei)
600                 return NULL;
601         return &ei->vfs_inode;
602 }
603 
604 static void qnx6_i_callback(struct rcu_head *head)
605 {
606         struct inode *inode = container_of(head, struct inode, i_rcu);
607         kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
608 }
609 
610 static void qnx6_destroy_inode(struct inode *inode)
611 {
612         call_rcu(&inode->i_rcu, qnx6_i_callback);
613 }
614 
615 static void init_once(void *foo)
616 {
617         struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo;
618 
619         inode_init_once(&ei->vfs_inode);
620 }
621 
622 static int init_inodecache(void)
623 {
624         qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache",
625                                              sizeof(struct qnx6_inode_info),
626                                              0, (SLAB_RECLAIM_ACCOUNT|
627                                                 SLAB_MEM_SPREAD),
628                                              init_once);
629         if (!qnx6_inode_cachep)
630                 return -ENOMEM;
631         return 0;
632 }
633 
634 static void destroy_inodecache(void)
635 {
636         /*
637          * Make sure all delayed rcu free inodes are flushed before we
638          * destroy cache.
639          */
640         rcu_barrier();
641         kmem_cache_destroy(qnx6_inode_cachep);
642 }
643 
644 static struct dentry *qnx6_mount(struct file_system_type *fs_type,
645         int flags, const char *dev_name, void *data)
646 {
647         return mount_bdev(fs_type, flags, dev_name, data, qnx6_fill_super);
648 }
649 
650 static struct file_system_type qnx6_fs_type = {
651         .owner          = THIS_MODULE,
652         .name           = "qnx6",
653         .mount          = qnx6_mount,
654         .kill_sb        = kill_block_super,
655         .fs_flags       = FS_REQUIRES_DEV,
656 };
657 MODULE_ALIAS_FS("qnx6");
658 
659 static int __init init_qnx6_fs(void)
660 {
661         int err;
662 
663         err = init_inodecache();
664         if (err)
665                 return err;
666 
667         err = register_filesystem(&qnx6_fs_type);
668         if (err) {
669                 destroy_inodecache();
670                 return err;
671         }
672 
673         pr_info("QNX6 filesystem 1.0.0 registered.\n");
674         return 0;
675 }
676 
677 static void __exit exit_qnx6_fs(void)
678 {
679         unregister_filesystem(&qnx6_fs_type);
680         destroy_inodecache();
681 }
682 
683 module_init(init_qnx6_fs)
684 module_exit(exit_qnx6_fs)
685 MODULE_LICENSE("GPL");
686 

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