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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
28static const struct super_operations qnx6_sops;
29
30static void qnx6_put_super(struct super_block *sb);
31static struct inode *qnx6_alloc_inode(struct super_block *sb);
32static void qnx6_destroy_inode(struct inode *inode);
33static int qnx6_remount(struct super_block *sb, int *flags, char *data);
34static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf);
35static int qnx6_show_options(struct seq_file *seq, struct dentry *root);
36
37static 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
46static 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
56static 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
63static 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
69static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);
70
71static int qnx6_get_block(struct inode *inode, sector_t iblock,
72 struct buffer_head *bh, int create)
73{
74 unsigned phys;
75
76 QNX6DEBUG((KERN_INFO "qnx6: 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
87static int qnx6_check_blockptr(__fs32 ptr)
88{
89 if (ptr == ~(__fs32)0) {
90 printk(KERN_ERR "qnx6: hit unused blockpointer.\n");
91 return 0;
92 }
93 return 1;
94}
95
96static int qnx6_readpage(struct file *file, struct page *page)
97{
98 return mpage_readpage(page, qnx6_get_block);
99}
100
101static 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 */
111static 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 printk(KERN_ERR "qnx6:Requested file block number (%u) too big.",
131 no);
132 return 0;
133 }
134
135 block = qnx6_get_devblock(s, ei->di_block_ptr[levelptr]);
136
137 for (i = 0; i < depth; i++) {
138 bh = sb_bread(s, block);
139 if (!bh) {
140 printk(KERN_ERR "qnx6:Error reading block (%u)\n",
141 block);
142 return 0;
143 }
144 bitdelta -= ptrbits;
145 levelptr = (no >> bitdelta) & mask;
146 ptr = ((__fs32 *)bh->b_data)[levelptr];
147
148 if (!qnx6_check_blockptr(ptr))
149 return 0;
150
151 block = qnx6_get_devblock(s, ptr);
152 brelse(bh);
153 }
154 return block;
155}
156
157static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf)
158{
159 struct super_block *sb = dentry->d_sb;
160 struct qnx6_sb_info *sbi = QNX6_SB(sb);
161 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
162
163 buf->f_type = sb->s_magic;
164 buf->f_bsize = sb->s_blocksize;
165 buf->f_blocks = fs32_to_cpu(sbi, sbi->sb->sb_num_blocks);
166 buf->f_bfree = fs32_to_cpu(sbi, sbi->sb->sb_free_blocks);
167 buf->f_files = fs32_to_cpu(sbi, sbi->sb->sb_num_inodes);
168 buf->f_ffree = fs32_to_cpu(sbi, sbi->sb->sb_free_inodes);
169 buf->f_bavail = buf->f_bfree;
170 buf->f_namelen = QNX6_LONG_NAME_MAX;
171 buf->f_fsid.val[0] = (u32)id;
172 buf->f_fsid.val[1] = (u32)(id >> 32);
173
174 return 0;
175}
176
177/*
178 * Check the root directory of the filesystem to make sure
179 * it really _is_ a qnx6 filesystem, and to check the size
180 * of the directory entry.
181 */
182static const char *qnx6_checkroot(struct super_block *s)
183{
184 static char match_root[2][3] = {".\0\0", "..\0"};
185 int i, error = 0;
186 struct qnx6_dir_entry *dir_entry;
187 struct inode *root = s->s_root->d_inode;
188 struct address_space *mapping = root->i_mapping;
189 struct page *page = read_mapping_page(mapping, 0, NULL);
190 if (IS_ERR(page))
191 return "error reading root directory";
192 kmap(page);
193 dir_entry = page_address(page);
194 for (i = 0; i < 2; i++) {
195 /* maximum 3 bytes - due to match_root limitation */
196 if (strncmp(dir_entry[i].de_fname, match_root[i], 3))
197 error = 1;
198 }
199 qnx6_put_page(page);
200 if (error)
201 return "error reading root directory.";
202 return NULL;
203}
204
205#ifdef CONFIG_QNX6FS_DEBUG
206void qnx6_superblock_debug(struct qnx6_super_block *sb, struct super_block *s)
207{
208 struct qnx6_sb_info *sbi = QNX6_SB(s);
209
210 QNX6DEBUG((KERN_INFO "magic: %08x\n",
211 fs32_to_cpu(sbi, sb->sb_magic)));
212 QNX6DEBUG((KERN_INFO "checksum: %08x\n",
213 fs32_to_cpu(sbi, sb->sb_checksum)));
214 QNX6DEBUG((KERN_INFO "serial: %llx\n",
215 fs64_to_cpu(sbi, sb->sb_serial)));
216 QNX6DEBUG((KERN_INFO "flags: %08x\n",
217 fs32_to_cpu(sbi, sb->sb_flags)));
218 QNX6DEBUG((KERN_INFO "blocksize: %08x\n",
219 fs32_to_cpu(sbi, sb->sb_blocksize)));
220 QNX6DEBUG((KERN_INFO "num_inodes: %08x\n",
221 fs32_to_cpu(sbi, sb->sb_num_inodes)));
222 QNX6DEBUG((KERN_INFO "free_inodes: %08x\n",
223 fs32_to_cpu(sbi, sb->sb_free_inodes)));
224 QNX6DEBUG((KERN_INFO "num_blocks: %08x\n",
225 fs32_to_cpu(sbi, sb->sb_num_blocks)));
226 QNX6DEBUG((KERN_INFO "free_blocks: %08x\n",
227 fs32_to_cpu(sbi, sb->sb_free_blocks)));
228 QNX6DEBUG((KERN_INFO "inode_levels: %02x\n",
229 sb->Inode.levels));
230}
231#endif
232
233enum {
234 Opt_mmifs,
235 Opt_err
236};
237
238static const match_table_t tokens = {
239 {Opt_mmifs, "mmi_fs"},
240 {Opt_err, NULL}
241};
242
243static int qnx6_parse_options(char *options, struct super_block *sb)
244{
245 char *p;
246 struct qnx6_sb_info *sbi = QNX6_SB(sb);
247 substring_t args[MAX_OPT_ARGS];
248
249 if (!options)
250 return 1;
251
252 while ((p = strsep(&options, ",")) != NULL) {
253 int token;
254 if (!*p)
255 continue;
256
257 token = match_token(p, tokens, args);
258 switch (token) {
259 case Opt_mmifs:
260 set_opt(sbi->s_mount_opt, MMI_FS);
261 break;
262 default:
263 return 0;
264 }
265 }
266 return 1;
267}
268
269static struct buffer_head *qnx6_check_first_superblock(struct super_block *s,
270 int offset, int silent)
271{
272 struct qnx6_sb_info *sbi = QNX6_SB(s);
273 struct buffer_head *bh;
274 struct qnx6_super_block *sb;
275
276 /* Check the superblock signatures
277 start with the first superblock */
278 bh = sb_bread(s, offset);
279 if (!bh) {
280 printk(KERN_ERR "qnx6: unable to read the first superblock\n");
281 return NULL;
282 }
283 sb = (struct qnx6_super_block *)bh->b_data;
284 if (fs32_to_cpu(sbi, sb->sb_magic) != QNX6_SUPER_MAGIC) {
285 sbi->s_bytesex = BYTESEX_BE;
286 if (fs32_to_cpu(sbi, sb->sb_magic) == QNX6_SUPER_MAGIC) {
287 /* we got a big endian fs */
288 QNX6DEBUG((KERN_INFO "qnx6: fs got different"
289 " endianness.\n"));
290 return bh;
291 } else
292 sbi->s_bytesex = BYTESEX_LE;
293 if (!silent) {
294 if (offset == 0) {
295 printk(KERN_ERR "qnx6: wrong signature (magic)"
296 " in superblock #1.\n");
297 } else {
298 printk(KERN_INFO "qnx6: wrong signature (magic)"
299 " at position (0x%lx) - will try"
300 " alternative position (0x0000).\n",
301 offset * s->s_blocksize);
302 }
303 }
304 brelse(bh);
305 return NULL;
306 }
307 return bh;
308}
309
310static struct inode *qnx6_private_inode(struct super_block *s,
311 struct qnx6_root_node *p);
312
313static int qnx6_fill_super(struct super_block *s, void *data, int silent)
314{
315 struct buffer_head *bh1 = NULL, *bh2 = NULL;
316 struct qnx6_super_block *sb1 = NULL, *sb2 = NULL;
317 struct qnx6_sb_info *sbi;
318 struct inode *root;
319 const char *errmsg;
320 struct qnx6_sb_info *qs;
321 int ret = -EINVAL;
322 u64 offset;
323 int bootblock_offset = QNX6_BOOTBLOCK_SIZE;
324
325 qs = kzalloc(sizeof(struct qnx6_sb_info), GFP_KERNEL);
326 if (!qs)
327 return -ENOMEM;
328 s->s_fs_info = qs;
329
330 /* Superblock always is 512 Byte long */
331 if (!sb_set_blocksize(s, QNX6_SUPERBLOCK_SIZE)) {
332 printk(KERN_ERR "qnx6: unable to set blocksize\n");
333 goto outnobh;
334 }
335
336 /* parse the mount-options */
337 if (!qnx6_parse_options((char *) data, s)) {
338 printk(KERN_ERR "qnx6: invalid mount options.\n");
339 goto outnobh;
340 }
341 if (test_opt(s, MMI_FS)) {
342 sb1 = qnx6_mmi_fill_super(s, silent);
343 if (sb1)
344 goto mmi_success;
345 else
346 goto outnobh;
347 }
348 sbi = QNX6_SB(s);
349 sbi->s_bytesex = BYTESEX_LE;
350 /* Check the superblock signatures
351 start with the first superblock */
352 bh1 = qnx6_check_first_superblock(s,
353 bootblock_offset / QNX6_SUPERBLOCK_SIZE, silent);
354 if (!bh1) {
355 /* try again without bootblock offset */
356 bh1 = qnx6_check_first_superblock(s, 0, silent);
357 if (!bh1) {
358 printk(KERN_ERR "qnx6: unable to read the first superblock\n");
359 goto outnobh;
360 }
361 /* seems that no bootblock at partition start */
362 bootblock_offset = 0;
363 }
364 sb1 = (struct qnx6_super_block *)bh1->b_data;
365
366#ifdef CONFIG_QNX6FS_DEBUG
367 qnx6_superblock_debug(sb1, s);
368#endif
369
370 /* checksum check - start at byte 8 and end at byte 512 */
371 if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
372 crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
373 printk(KERN_ERR "qnx6: superblock #1 checksum error\n");
374 goto out;
375 }
376
377 /* set new blocksize */
378 if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
379 printk(KERN_ERR "qnx6: unable to set blocksize\n");
380 goto out;
381 }
382 /* blocksize invalidates bh - pull it back in */
383 brelse(bh1);
384 bh1 = sb_bread(s, bootblock_offset >> s->s_blocksize_bits);
385 if (!bh1)
386 goto outnobh;
387 sb1 = (struct qnx6_super_block *)bh1->b_data;
388
389 /* calculate second superblock blocknumber */
390 offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) +
391 (bootblock_offset >> s->s_blocksize_bits) +
392 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
393
394 /* set bootblock offset */
395 sbi->s_blks_off = (bootblock_offset >> s->s_blocksize_bits) +
396 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
397
398 /* next the second superblock */
399 bh2 = sb_bread(s, offset);
400 if (!bh2) {
401 printk(KERN_ERR "qnx6: unable to read the second superblock\n");
402 goto out;
403 }
404 sb2 = (struct qnx6_super_block *)bh2->b_data;
405 if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
406 if (!silent)
407 printk(KERN_ERR "qnx6: wrong signature (magic)"
408 " in superblock #2.\n");
409 goto out;
410 }
411
412 /* checksum check - start at byte 8 and end at byte 512 */
413 if (fs32_to_cpu(sbi, sb2->sb_checksum) !=
414 crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
415 printk(KERN_ERR "qnx6: superblock #2 checksum error\n");
416 goto out;
417 }
418
419 if (fs64_to_cpu(sbi, sb1->sb_serial) >=
420 fs64_to_cpu(sbi, sb2->sb_serial)) {
421 /* superblock #1 active */
422 sbi->sb_buf = bh1;
423 sbi->sb = (struct qnx6_super_block *)bh1->b_data;
424 brelse(bh2);
425 printk(KERN_INFO "qnx6: superblock #1 active\n");
426 } else {
427 /* superblock #2 active */
428 sbi->sb_buf = bh2;
429 sbi->sb = (struct qnx6_super_block *)bh2->b_data;
430 brelse(bh1);
431 printk(KERN_INFO "qnx6: superblock #2 active\n");
432 }
433mmi_success:
434 /* sanity check - limit maximum indirect pointer levels */
435 if (sb1->Inode.levels > QNX6_PTR_MAX_LEVELS) {
436 printk(KERN_ERR "qnx6: too many inode levels (max %i, sb %i)\n",
437 QNX6_PTR_MAX_LEVELS, sb1->Inode.levels);
438 goto out;
439 }
440 if (sb1->Longfile.levels > QNX6_PTR_MAX_LEVELS) {
441 printk(KERN_ERR "qnx6: too many longfilename levels"
442 " (max %i, sb %i)\n",
443 QNX6_PTR_MAX_LEVELS, sb1->Longfile.levels);
444 goto out;
445 }
446 s->s_op = &qnx6_sops;
447 s->s_magic = QNX6_SUPER_MAGIC;
448 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
449
450 /* ease the later tree level calculations */
451 sbi = QNX6_SB(s);
452 sbi->s_ptrbits = ilog2(s->s_blocksize / 4);
453 sbi->inodes = qnx6_private_inode(s, &sb1->Inode);
454 if (!sbi->inodes)
455 goto out;
456 sbi->longfile = qnx6_private_inode(s, &sb1->Longfile);
457 if (!sbi->longfile)
458 goto out1;
459
460 /* prefetch root inode */
461 root = qnx6_iget(s, QNX6_ROOT_INO);
462 if (IS_ERR(root)) {
463 printk(KERN_ERR "qnx6: get inode failed\n");
464 ret = PTR_ERR(root);
465 goto out2;
466 }
467
468 ret = -ENOMEM;
469 s->s_root = d_make_root(root);
470 if (!s->s_root)
471 goto out2;
472
473 ret = -EINVAL;
474 errmsg = qnx6_checkroot(s);
475 if (errmsg != NULL) {
476 if (!silent)
477 printk(KERN_ERR "qnx6: %s\n", errmsg);
478 goto out3;
479 }
480 return 0;
481
482out3:
483 dput(s->s_root);
484 s->s_root = NULL;
485out2:
486 iput(sbi->longfile);
487out1:
488 iput(sbi->inodes);
489out:
490 if (bh1)
491 brelse(bh1);
492 if (bh2)
493 brelse(bh2);
494outnobh:
495 kfree(qs);
496 s->s_fs_info = NULL;
497 return ret;
498}
499
500static void qnx6_put_super(struct super_block *sb)
501{
502 struct qnx6_sb_info *qs = QNX6_SB(sb);
503 brelse(qs->sb_buf);
504 iput(qs->longfile);
505 iput(qs->inodes);
506 kfree(qs);
507 sb->s_fs_info = NULL;
508 return;
509}
510
511static sector_t qnx6_bmap(struct address_space *mapping, sector_t block)
512{
513 return generic_block_bmap(mapping, block, qnx6_get_block);
514}
515static const struct address_space_operations qnx6_aops = {
516 .readpage = qnx6_readpage,
517 .readpages = qnx6_readpages,
518 .bmap = qnx6_bmap
519};
520
521static struct inode *qnx6_private_inode(struct super_block *s,
522 struct qnx6_root_node *p)
523{
524 struct inode *inode = new_inode(s);
525 if (inode) {
526 struct qnx6_inode_info *ei = QNX6_I(inode);
527 struct qnx6_sb_info *sbi = QNX6_SB(s);
528 inode->i_size = fs64_to_cpu(sbi, p->size);
529 memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr));
530 ei->di_filelevels = p->levels;
531 inode->i_mode = S_IFREG | S_IRUSR; /* probably wrong */
532 inode->i_mapping->a_ops = &qnx6_aops;
533 }
534 return inode;
535}
536
537struct inode *qnx6_iget(struct super_block *sb, unsigned ino)
538{
539 struct qnx6_sb_info *sbi = QNX6_SB(sb);
540 struct qnx6_inode_entry *raw_inode;
541 struct inode *inode;
542 struct qnx6_inode_info *ei;
543 struct address_space *mapping;
544 struct page *page;
545 u32 n, offs;
546
547 inode = iget_locked(sb, ino);
548 if (!inode)
549 return ERR_PTR(-ENOMEM);
550 if (!(inode->i_state & I_NEW))
551 return inode;
552
553 ei = QNX6_I(inode);
554
555 inode->i_mode = 0;
556
557 if (ino == 0) {
558 printk(KERN_ERR "qnx6: bad inode number on dev %s: %u is "
559 "out of range\n",
560 sb->s_id, ino);
561 iget_failed(inode);
562 return ERR_PTR(-EIO);
563 }
564 n = (ino - 1) >> (PAGE_CACHE_SHIFT - QNX6_INODE_SIZE_BITS);
565 offs = (ino - 1) & (~PAGE_CACHE_MASK >> QNX6_INODE_SIZE_BITS);
566 mapping = sbi->inodes->i_mapping;
567 page = read_mapping_page(mapping, n, NULL);
568 if (IS_ERR(page)) {
569 printk(KERN_ERR "qnx6: major problem: unable to read inode from "
570 "dev %s\n", sb->s_id);
571 iget_failed(inode);
572 return ERR_CAST(page);
573 }
574 kmap(page);
575 raw_inode = ((struct qnx6_inode_entry *)page_address(page)) + offs;
576
577 inode->i_mode = fs16_to_cpu(sbi, raw_inode->di_mode);
578 i_uid_write(inode, (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid));
579 i_gid_write(inode, (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid));
580 inode->i_size = fs64_to_cpu(sbi, raw_inode->di_size);
581 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_mtime);
582 inode->i_mtime.tv_nsec = 0;
583 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_atime);
584 inode->i_atime.tv_nsec = 0;
585 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_ctime);
586 inode->i_ctime.tv_nsec = 0;
587
588 /* calc blocks based on 512 byte blocksize */
589 inode->i_blocks = (inode->i_size + 511) >> 9;
590
591 memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr,
592 sizeof(raw_inode->di_block_ptr));
593 ei->di_filelevels = raw_inode->di_filelevels;
594
595 if (S_ISREG(inode->i_mode)) {
596 inode->i_fop = &generic_ro_fops;
597 inode->i_mapping->a_ops = &qnx6_aops;
598 } else if (S_ISDIR(inode->i_mode)) {
599 inode->i_op = &qnx6_dir_inode_operations;
600 inode->i_fop = &qnx6_dir_operations;
601 inode->i_mapping->a_ops = &qnx6_aops;
602 } else if (S_ISLNK(inode->i_mode)) {
603 inode->i_op = &page_symlink_inode_operations;
604 inode->i_mapping->a_ops = &qnx6_aops;
605 } else
606 init_special_inode(inode, inode->i_mode, 0);
607 qnx6_put_page(page);
608 unlock_new_inode(inode);
609 return inode;
610}
611
612static struct kmem_cache *qnx6_inode_cachep;
613
614static struct inode *qnx6_alloc_inode(struct super_block *sb)
615{
616 struct qnx6_inode_info *ei;
617 ei = kmem_cache_alloc(qnx6_inode_cachep, GFP_KERNEL);
618 if (!ei)
619 return NULL;
620 return &ei->vfs_inode;
621}
622
623static void qnx6_i_callback(struct rcu_head *head)
624{
625 struct inode *inode = container_of(head, struct inode, i_rcu);
626 kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
627}
628
629static void qnx6_destroy_inode(struct inode *inode)
630{
631 call_rcu(&inode->i_rcu, qnx6_i_callback);
632}
633
634static void init_once(void *foo)
635{
636 struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo;
637
638 inode_init_once(&ei->vfs_inode);
639}
640
641static int init_inodecache(void)
642{
643 qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache",
644 sizeof(struct qnx6_inode_info),
645 0, (SLAB_RECLAIM_ACCOUNT|
646 SLAB_MEM_SPREAD),
647 init_once);
648 if (!qnx6_inode_cachep)
649 return -ENOMEM;
650 return 0;
651}
652
653static void destroy_inodecache(void)
654{
655 /*
656 * Make sure all delayed rcu free inodes are flushed before we
657 * destroy cache.
658 */
659 rcu_barrier();
660 kmem_cache_destroy(qnx6_inode_cachep);
661}
662
663static struct dentry *qnx6_mount(struct file_system_type *fs_type,
664 int flags, const char *dev_name, void *data)
665{
666 return mount_bdev(fs_type, flags, dev_name, data, qnx6_fill_super);
667}
668
669static struct file_system_type qnx6_fs_type = {
670 .owner = THIS_MODULE,
671 .name = "qnx6",
672 .mount = qnx6_mount,
673 .kill_sb = kill_block_super,
674 .fs_flags = FS_REQUIRES_DEV,
675};
676MODULE_ALIAS_FS("qnx6");
677
678static int __init init_qnx6_fs(void)
679{
680 int err;
681
682 err = init_inodecache();
683 if (err)
684 return err;
685
686 err = register_filesystem(&qnx6_fs_type);
687 if (err) {
688 destroy_inodecache();
689 return err;
690 }
691
692 printk(KERN_INFO "QNX6 filesystem 1.0.0 registered.\n");
693 return 0;
694}
695
696static void __exit exit_qnx6_fs(void)
697{
698 unregister_filesystem(&qnx6_fs_type);
699 destroy_inodecache();
700}
701
702module_init(init_qnx6_fs)
703module_exit(exit_qnx6_fs)
704MODULE_LICENSE("GPL");
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/seq_file.h>
23#include <linux/crc32.h>
24#include <linux/mpage.h>
25#include <linux/fs_parser.h>
26#include <linux/fs_context.h>
27#include "qnx6.h"
28
29static const struct super_operations qnx6_sops;
30
31static void qnx6_put_super(struct super_block *sb);
32static struct inode *qnx6_alloc_inode(struct super_block *sb);
33static void qnx6_free_inode(struct inode *inode);
34static int qnx6_reconfigure(struct fs_context *fc);
35static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf);
36static int qnx6_show_options(struct seq_file *seq, struct dentry *root);
37
38static 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 .show_options = qnx6_show_options,
44};
45
46static 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
56static int qnx6_reconfigure(struct fs_context *fc)
57{
58 struct super_block *sb = fc->root->d_sb;
59
60 sync_filesystem(sb);
61 fc->sb_flags |= SB_RDONLY;
62 return 0;
63}
64
65static unsigned qnx6_get_devblock(struct super_block *sb, __fs32 block)
66{
67 struct qnx6_sb_info *sbi = QNX6_SB(sb);
68 return fs32_to_cpu(sbi, block) + sbi->s_blks_off;
69}
70
71static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);
72
73static int qnx6_get_block(struct inode *inode, sector_t iblock,
74 struct buffer_head *bh, int create)
75{
76 unsigned phys;
77
78 pr_debug("qnx6_get_block inode=[%ld] iblock=[%ld]\n",
79 inode->i_ino, (unsigned long)iblock);
80
81 phys = qnx6_block_map(inode, iblock);
82 if (phys) {
83 /* logical block is before EOF */
84 map_bh(bh, inode->i_sb, phys);
85 }
86 return 0;
87}
88
89static int qnx6_check_blockptr(__fs32 ptr)
90{
91 if (ptr == ~(__fs32)0) {
92 pr_err("hit unused blockpointer.\n");
93 return 0;
94 }
95 return 1;
96}
97
98static int qnx6_read_folio(struct file *file, struct folio *folio)
99{
100 return mpage_read_folio(folio, qnx6_get_block);
101}
102
103static void qnx6_readahead(struct readahead_control *rac)
104{
105 mpage_readahead(rac, qnx6_get_block);
106}
107
108/*
109 * returns the block number for the no-th element in the tree
110 * inodebits requred as there are multiple inodes in one inode block
111 */
112static unsigned qnx6_block_map(struct inode *inode, unsigned no)
113{
114 struct super_block *s = inode->i_sb;
115 struct qnx6_sb_info *sbi = QNX6_SB(s);
116 struct qnx6_inode_info *ei = QNX6_I(inode);
117 unsigned block = 0;
118 struct buffer_head *bh;
119 __fs32 ptr;
120 int levelptr;
121 int ptrbits = sbi->s_ptrbits;
122 int bitdelta;
123 u32 mask = (1 << ptrbits) - 1;
124 int depth = ei->di_filelevels;
125 int i;
126
127 bitdelta = ptrbits * depth;
128 levelptr = no >> bitdelta;
129
130 if (levelptr > QNX6_NO_DIRECT_POINTERS - 1) {
131 pr_err("Requested file block number (%u) too big.", no);
132 return 0;
133 }
134
135 block = qnx6_get_devblock(s, ei->di_block_ptr[levelptr]);
136
137 for (i = 0; i < depth; i++) {
138 bh = sb_bread(s, block);
139 if (!bh) {
140 pr_err("Error reading block (%u)\n", block);
141 return 0;
142 }
143 bitdelta -= ptrbits;
144 levelptr = (no >> bitdelta) & mask;
145 ptr = ((__fs32 *)bh->b_data)[levelptr];
146
147 if (!qnx6_check_blockptr(ptr))
148 return 0;
149
150 block = qnx6_get_devblock(s, ptr);
151 brelse(bh);
152 }
153 return block;
154}
155
156static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf)
157{
158 struct super_block *sb = dentry->d_sb;
159 struct qnx6_sb_info *sbi = QNX6_SB(sb);
160 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
161
162 buf->f_type = sb->s_magic;
163 buf->f_bsize = sb->s_blocksize;
164 buf->f_blocks = fs32_to_cpu(sbi, sbi->sb->sb_num_blocks);
165 buf->f_bfree = fs32_to_cpu(sbi, sbi->sb->sb_free_blocks);
166 buf->f_files = fs32_to_cpu(sbi, sbi->sb->sb_num_inodes);
167 buf->f_ffree = fs32_to_cpu(sbi, sbi->sb->sb_free_inodes);
168 buf->f_bavail = buf->f_bfree;
169 buf->f_namelen = QNX6_LONG_NAME_MAX;
170 buf->f_fsid = u64_to_fsid(id);
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 */
180static const char *qnx6_checkroot(struct super_block *s)
181{
182 int error = 0;
183 struct qnx6_dir_entry *dir_entry;
184 struct inode *root = d_inode(s->s_root);
185 struct address_space *mapping = root->i_mapping;
186 struct folio *folio = read_mapping_folio(mapping, 0, NULL);
187
188 if (IS_ERR(folio))
189 return "error reading root directory";
190 dir_entry = kmap_local_folio(folio, 0);
191 if (memcmp(dir_entry[0].de_fname, ".", 2) ||
192 memcmp(dir_entry[1].de_fname, "..", 3))
193 error = 1;
194 folio_release_kmap(folio, dir_entry);
195 if (error)
196 return "error reading root directory.";
197 return NULL;
198}
199
200#ifdef CONFIG_QNX6FS_DEBUG
201void qnx6_superblock_debug(struct qnx6_super_block *sb, struct super_block *s)
202{
203 struct qnx6_sb_info *sbi = QNX6_SB(s);
204
205 pr_debug("magic: %08x\n", fs32_to_cpu(sbi, sb->sb_magic));
206 pr_debug("checksum: %08x\n", fs32_to_cpu(sbi, sb->sb_checksum));
207 pr_debug("serial: %llx\n", fs64_to_cpu(sbi, sb->sb_serial));
208 pr_debug("flags: %08x\n", fs32_to_cpu(sbi, sb->sb_flags));
209 pr_debug("blocksize: %08x\n", fs32_to_cpu(sbi, sb->sb_blocksize));
210 pr_debug("num_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_num_inodes));
211 pr_debug("free_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_free_inodes));
212 pr_debug("num_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_num_blocks));
213 pr_debug("free_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_free_blocks));
214 pr_debug("inode_levels: %02x\n", sb->Inode.levels);
215}
216#endif
217
218enum {
219 Opt_mmifs
220};
221
222struct qnx6_context {
223 unsigned long s_mount_opts;
224};
225
226static const struct fs_parameter_spec qnx6_param_spec[] = {
227 fsparam_flag ("mmi_fs", Opt_mmifs),
228 {}
229};
230
231static int qnx6_parse_param(struct fs_context *fc, struct fs_parameter *param)
232{
233 struct qnx6_context *ctx = fc->fs_private;
234 struct fs_parse_result result;
235 int opt;
236
237 opt = fs_parse(fc, qnx6_param_spec, param, &result);
238 if (opt < 0)
239 return opt;
240
241 switch (opt) {
242 case Opt_mmifs:
243 ctx->s_mount_opts |= QNX6_MOUNT_MMI_FS;
244 break;
245 default:
246 return -EINVAL;
247 }
248 return 0;
249}
250
251static struct buffer_head *qnx6_check_first_superblock(struct super_block *s,
252 int offset, int silent)
253{
254 struct qnx6_sb_info *sbi = QNX6_SB(s);
255 struct buffer_head *bh;
256 struct qnx6_super_block *sb;
257
258 /* Check the superblock signatures
259 start with the first superblock */
260 bh = sb_bread(s, offset);
261 if (!bh) {
262 pr_err("unable to read the first superblock\n");
263 return NULL;
264 }
265 sb = (struct qnx6_super_block *)bh->b_data;
266 if (fs32_to_cpu(sbi, sb->sb_magic) != QNX6_SUPER_MAGIC) {
267 sbi->s_bytesex = BYTESEX_BE;
268 if (fs32_to_cpu(sbi, sb->sb_magic) == QNX6_SUPER_MAGIC) {
269 /* we got a big endian fs */
270 pr_debug("fs got different endianness.\n");
271 return bh;
272 } else
273 sbi->s_bytesex = BYTESEX_LE;
274 if (!silent) {
275 if (offset == 0) {
276 pr_err("wrong signature (magic) in superblock #1.\n");
277 } else {
278 pr_info("wrong signature (magic) at position (0x%lx) - will try alternative position (0x0000).\n",
279 offset * s->s_blocksize);
280 }
281 }
282 brelse(bh);
283 return NULL;
284 }
285 return bh;
286}
287
288static struct inode *qnx6_private_inode(struct super_block *s,
289 struct qnx6_root_node *p);
290
291static int qnx6_fill_super(struct super_block *s, struct fs_context *fc)
292{
293 struct buffer_head *bh1 = NULL, *bh2 = NULL;
294 struct qnx6_super_block *sb1 = NULL, *sb2 = NULL;
295 struct qnx6_sb_info *sbi;
296 struct qnx6_context *ctx = fc->fs_private;
297 struct inode *root;
298 const char *errmsg;
299 struct qnx6_sb_info *qs;
300 int ret = -EINVAL;
301 u64 offset;
302 int bootblock_offset = QNX6_BOOTBLOCK_SIZE;
303 int silent = fc->sb_flags & SB_SILENT;
304
305 qs = kzalloc(sizeof(struct qnx6_sb_info), GFP_KERNEL);
306 if (!qs)
307 return -ENOMEM;
308 s->s_fs_info = qs;
309 qs->s_mount_opt = ctx->s_mount_opts;
310
311 /* Superblock always is 512 Byte long */
312 if (!sb_set_blocksize(s, QNX6_SUPERBLOCK_SIZE)) {
313 pr_err("unable to set blocksize\n");
314 goto outnobh;
315 }
316
317 if (qs->s_mount_opt == QNX6_MOUNT_MMI_FS) {
318 sb1 = qnx6_mmi_fill_super(s, silent);
319 if (sb1)
320 goto mmi_success;
321 else
322 goto outnobh;
323 }
324 sbi = QNX6_SB(s);
325 sbi->s_bytesex = BYTESEX_LE;
326 /* Check the superblock signatures
327 start with the first superblock */
328 bh1 = qnx6_check_first_superblock(s,
329 bootblock_offset / QNX6_SUPERBLOCK_SIZE, silent);
330 if (!bh1) {
331 /* try again without bootblock offset */
332 bh1 = qnx6_check_first_superblock(s, 0, silent);
333 if (!bh1) {
334 pr_err("unable to read the first superblock\n");
335 goto outnobh;
336 }
337 /* seems that no bootblock at partition start */
338 bootblock_offset = 0;
339 }
340 sb1 = (struct qnx6_super_block *)bh1->b_data;
341
342#ifdef CONFIG_QNX6FS_DEBUG
343 qnx6_superblock_debug(sb1, s);
344#endif
345
346 /* checksum check - start at byte 8 and end at byte 512 */
347 if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
348 crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
349 pr_err("superblock #1 checksum error\n");
350 goto out;
351 }
352
353 /* set new blocksize */
354 if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
355 pr_err("unable to set blocksize\n");
356 goto out;
357 }
358 /* blocksize invalidates bh - pull it back in */
359 brelse(bh1);
360 bh1 = sb_bread(s, bootblock_offset >> s->s_blocksize_bits);
361 if (!bh1)
362 goto outnobh;
363 sb1 = (struct qnx6_super_block *)bh1->b_data;
364
365 /* calculate second superblock blocknumber */
366 offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) +
367 (bootblock_offset >> s->s_blocksize_bits) +
368 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
369
370 /* set bootblock offset */
371 sbi->s_blks_off = (bootblock_offset >> s->s_blocksize_bits) +
372 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
373
374 /* next the second superblock */
375 bh2 = sb_bread(s, offset);
376 if (!bh2) {
377 pr_err("unable to read the second superblock\n");
378 goto out;
379 }
380 sb2 = (struct qnx6_super_block *)bh2->b_data;
381 if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
382 if (!silent)
383 pr_err("wrong signature (magic) in superblock #2.\n");
384 goto out;
385 }
386
387 /* checksum check - start at byte 8 and end at byte 512 */
388 if (fs32_to_cpu(sbi, sb2->sb_checksum) !=
389 crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
390 pr_err("superblock #2 checksum error\n");
391 goto out;
392 }
393
394 if (fs64_to_cpu(sbi, sb1->sb_serial) >=
395 fs64_to_cpu(sbi, sb2->sb_serial)) {
396 /* superblock #1 active */
397 sbi->sb_buf = bh1;
398 sbi->sb = (struct qnx6_super_block *)bh1->b_data;
399 brelse(bh2);
400 pr_info("superblock #1 active\n");
401 } else {
402 /* superblock #2 active */
403 sbi->sb_buf = bh2;
404 sbi->sb = (struct qnx6_super_block *)bh2->b_data;
405 brelse(bh1);
406 pr_info("superblock #2 active\n");
407 }
408mmi_success:
409 /* sanity check - limit maximum indirect pointer levels */
410 if (sb1->Inode.levels > QNX6_PTR_MAX_LEVELS) {
411 pr_err("too many inode levels (max %i, sb %i)\n",
412 QNX6_PTR_MAX_LEVELS, sb1->Inode.levels);
413 goto out;
414 }
415 if (sb1->Longfile.levels > QNX6_PTR_MAX_LEVELS) {
416 pr_err("too many longfilename levels (max %i, sb %i)\n",
417 QNX6_PTR_MAX_LEVELS, sb1->Longfile.levels);
418 goto out;
419 }
420 s->s_op = &qnx6_sops;
421 s->s_magic = QNX6_SUPER_MAGIC;
422 s->s_flags |= SB_RDONLY; /* Yup, read-only yet */
423 s->s_time_min = 0;
424 s->s_time_max = U32_MAX;
425
426 /* ease the later tree level calculations */
427 sbi = QNX6_SB(s);
428 sbi->s_ptrbits = ilog2(s->s_blocksize / 4);
429 sbi->inodes = qnx6_private_inode(s, &sb1->Inode);
430 if (!sbi->inodes)
431 goto out;
432 sbi->longfile = qnx6_private_inode(s, &sb1->Longfile);
433 if (!sbi->longfile)
434 goto out1;
435
436 /* prefetch root inode */
437 root = qnx6_iget(s, QNX6_ROOT_INO);
438 if (IS_ERR(root)) {
439 pr_err("get inode failed\n");
440 ret = PTR_ERR(root);
441 goto out2;
442 }
443
444 ret = -ENOMEM;
445 s->s_root = d_make_root(root);
446 if (!s->s_root)
447 goto out2;
448
449 ret = -EINVAL;
450 errmsg = qnx6_checkroot(s);
451 if (errmsg != NULL) {
452 if (!silent)
453 pr_err("%s\n", errmsg);
454 goto out3;
455 }
456 return 0;
457
458out3:
459 dput(s->s_root);
460 s->s_root = NULL;
461out2:
462 iput(sbi->longfile);
463out1:
464 iput(sbi->inodes);
465out:
466 brelse(bh1);
467 brelse(bh2);
468outnobh:
469 kfree(qs);
470 s->s_fs_info = NULL;
471 return ret;
472}
473
474static void qnx6_put_super(struct super_block *sb)
475{
476 struct qnx6_sb_info *qs = QNX6_SB(sb);
477 brelse(qs->sb_buf);
478 iput(qs->longfile);
479 iput(qs->inodes);
480 kfree(qs);
481 sb->s_fs_info = NULL;
482 return;
483}
484
485static sector_t qnx6_bmap(struct address_space *mapping, sector_t block)
486{
487 return generic_block_bmap(mapping, block, qnx6_get_block);
488}
489static const struct address_space_operations qnx6_aops = {
490 .read_folio = qnx6_read_folio,
491 .readahead = qnx6_readahead,
492 .bmap = qnx6_bmap
493};
494
495static struct inode *qnx6_private_inode(struct super_block *s,
496 struct qnx6_root_node *p)
497{
498 struct inode *inode = new_inode(s);
499 if (inode) {
500 struct qnx6_inode_info *ei = QNX6_I(inode);
501 struct qnx6_sb_info *sbi = QNX6_SB(s);
502 inode->i_size = fs64_to_cpu(sbi, p->size);
503 memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr));
504 ei->di_filelevels = p->levels;
505 inode->i_mode = S_IFREG | S_IRUSR; /* probably wrong */
506 inode->i_mapping->a_ops = &qnx6_aops;
507 }
508 return inode;
509}
510
511struct inode *qnx6_iget(struct super_block *sb, unsigned ino)
512{
513 struct qnx6_sb_info *sbi = QNX6_SB(sb);
514 struct qnx6_inode_entry *raw_inode;
515 struct inode *inode;
516 struct qnx6_inode_info *ei;
517 struct address_space *mapping;
518 struct folio *folio;
519 u32 n, offs;
520
521 inode = iget_locked(sb, ino);
522 if (!inode)
523 return ERR_PTR(-ENOMEM);
524 if (!(inode->i_state & I_NEW))
525 return inode;
526
527 ei = QNX6_I(inode);
528
529 inode->i_mode = 0;
530
531 if (ino == 0) {
532 pr_err("bad inode number on dev %s: %u is out of range\n",
533 sb->s_id, ino);
534 iget_failed(inode);
535 return ERR_PTR(-EIO);
536 }
537 n = (ino - 1) >> (PAGE_SHIFT - QNX6_INODE_SIZE_BITS);
538 mapping = sbi->inodes->i_mapping;
539 folio = read_mapping_folio(mapping, n, NULL);
540 if (IS_ERR(folio)) {
541 pr_err("major problem: unable to read inode from dev %s\n",
542 sb->s_id);
543 iget_failed(inode);
544 return ERR_CAST(folio);
545 }
546 offs = offset_in_folio(folio, (ino - 1) << QNX6_INODE_SIZE_BITS);
547 raw_inode = kmap_local_folio(folio, offs);
548
549 inode->i_mode = fs16_to_cpu(sbi, raw_inode->di_mode);
550 i_uid_write(inode, (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid));
551 i_gid_write(inode, (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid));
552 inode->i_size = fs64_to_cpu(sbi, raw_inode->di_size);
553 inode_set_mtime(inode, fs32_to_cpu(sbi, raw_inode->di_mtime), 0);
554 inode_set_atime(inode, fs32_to_cpu(sbi, raw_inode->di_atime), 0);
555 inode_set_ctime(inode, fs32_to_cpu(sbi, raw_inode->di_ctime), 0);
556
557 /* calc blocks based on 512 byte blocksize */
558 inode->i_blocks = (inode->i_size + 511) >> 9;
559
560 memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr,
561 sizeof(raw_inode->di_block_ptr));
562 ei->di_filelevels = raw_inode->di_filelevels;
563
564 if (S_ISREG(inode->i_mode)) {
565 inode->i_fop = &generic_ro_fops;
566 inode->i_mapping->a_ops = &qnx6_aops;
567 } else if (S_ISDIR(inode->i_mode)) {
568 inode->i_op = &qnx6_dir_inode_operations;
569 inode->i_fop = &qnx6_dir_operations;
570 inode->i_mapping->a_ops = &qnx6_aops;
571 } else if (S_ISLNK(inode->i_mode)) {
572 inode->i_op = &page_symlink_inode_operations;
573 inode_nohighmem(inode);
574 inode->i_mapping->a_ops = &qnx6_aops;
575 } else
576 init_special_inode(inode, inode->i_mode, 0);
577 folio_release_kmap(folio, raw_inode);
578 unlock_new_inode(inode);
579 return inode;
580}
581
582static struct kmem_cache *qnx6_inode_cachep;
583
584static struct inode *qnx6_alloc_inode(struct super_block *sb)
585{
586 struct qnx6_inode_info *ei;
587 ei = alloc_inode_sb(sb, qnx6_inode_cachep, GFP_KERNEL);
588 if (!ei)
589 return NULL;
590 return &ei->vfs_inode;
591}
592
593static void qnx6_free_inode(struct inode *inode)
594{
595 kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
596}
597
598static void init_once(void *foo)
599{
600 struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo;
601
602 inode_init_once(&ei->vfs_inode);
603}
604
605static int init_inodecache(void)
606{
607 qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache",
608 sizeof(struct qnx6_inode_info),
609 0, (SLAB_RECLAIM_ACCOUNT|
610 SLAB_ACCOUNT),
611 init_once);
612 if (!qnx6_inode_cachep)
613 return -ENOMEM;
614 return 0;
615}
616
617static void destroy_inodecache(void)
618{
619 /*
620 * Make sure all delayed rcu free inodes are flushed before we
621 * destroy cache.
622 */
623 rcu_barrier();
624 kmem_cache_destroy(qnx6_inode_cachep);
625}
626
627static int qnx6_get_tree(struct fs_context *fc)
628{
629 return get_tree_bdev(fc, qnx6_fill_super);
630}
631
632static void qnx6_free_fc(struct fs_context *fc)
633{
634 kfree(fc->fs_private);
635}
636
637static const struct fs_context_operations qnx6_context_ops = {
638 .parse_param = qnx6_parse_param,
639 .get_tree = qnx6_get_tree,
640 .reconfigure = qnx6_reconfigure,
641 .free = qnx6_free_fc,
642};
643
644static int qnx6_init_fs_context(struct fs_context *fc)
645{
646 struct qnx6_context *ctx;
647
648 ctx = kzalloc(sizeof(struct qnx6_context), GFP_KERNEL);
649 if (!ctx)
650 return -ENOMEM;
651 fc->ops = &qnx6_context_ops;
652 fc->fs_private = ctx;
653
654 return 0;
655}
656
657static struct file_system_type qnx6_fs_type = {
658 .owner = THIS_MODULE,
659 .name = "qnx6",
660 .kill_sb = kill_block_super,
661 .fs_flags = FS_REQUIRES_DEV,
662 .init_fs_context = qnx6_init_fs_context,
663 .parameters = qnx6_param_spec,
664};
665MODULE_ALIAS_FS("qnx6");
666
667static int __init init_qnx6_fs(void)
668{
669 int err;
670
671 err = init_inodecache();
672 if (err)
673 return err;
674
675 err = register_filesystem(&qnx6_fs_type);
676 if (err) {
677 destroy_inodecache();
678 return err;
679 }
680
681 pr_info("QNX6 filesystem 1.0.0 registered.\n");
682 return 0;
683}
684
685static void __exit exit_qnx6_fs(void)
686{
687 unregister_filesystem(&qnx6_fs_type);
688 destroy_inodecache();
689}
690
691module_init(init_qnx6_fs)
692module_exit(exit_qnx6_fs)
693MODULE_DESCRIPTION("QNX6 file system");
694MODULE_LICENSE("GPL");