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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
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_remount(struct super_block *sb, int *flags, char *data);
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 .remount_fs = qnx6_remount,
44 .show_options = qnx6_show_options,
45};
46
47static 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
57static 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
64static 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
70static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);
71
72static 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
83 map_bh(bh, inode->i_sb, phys);
84 }
85 return 0;
86}
87
88static 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
97static int qnx6_readpage(struct file *file, struct page *page)
98{
99 return mpage_readpage(page, qnx6_get_block);
100}
101
102static int qnx6_readpages(struct file *file, struct address_space *mapping,
103 struct list_head *pages, unsigned nr_pages)
104{
105 return mpage_readpages(mapping, pages, nr_pages, qnx6_get_block);
106}
107
108
109
110
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.val[0] = (u32)id;
171 buf->f_fsid.val[1] = (u32)(id >> 32);
172
173 return 0;
174}
175
176
177
178
179
180
181static const char *qnx6_checkroot(struct super_block *s)
182{
183 static char match_root[2][3] = {".\0\0", "..\0"};
184 int i, error = 0;
185 struct qnx6_dir_entry *dir_entry;
186 struct inode *root = d_inode(s->s_root);
187 struct address_space *mapping = root->i_mapping;
188 struct page *page = read_mapping_page(mapping, 0, NULL);
189 if (IS_ERR(page))
190 return "error reading root directory";
191 kmap(page);
192 dir_entry = page_address(page);
193 for (i = 0; i < 2; i++) {
194
195 if (strncmp(dir_entry[i].de_fname, match_root[i], 3))
196 error = 1;
197 }
198 qnx6_put_page(page);
199 if (error)
200 return "error reading root directory.";
201 return NULL;
202}
203
204#ifdef CONFIG_QNX6FS_DEBUG
205void qnx6_superblock_debug(struct qnx6_super_block *sb, struct super_block *s)
206{
207 struct qnx6_sb_info *sbi = QNX6_SB(s);
208
209 pr_debug("magic: %08x\n", fs32_to_cpu(sbi, sb->sb_magic));
210 pr_debug("checksum: %08x\n", fs32_to_cpu(sbi, sb->sb_checksum));
211 pr_debug("serial: %llx\n", fs64_to_cpu(sbi, sb->sb_serial));
212 pr_debug("flags: %08x\n", fs32_to_cpu(sbi, sb->sb_flags));
213 pr_debug("blocksize: %08x\n", fs32_to_cpu(sbi, sb->sb_blocksize));
214 pr_debug("num_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_num_inodes));
215 pr_debug("free_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_free_inodes));
216 pr_debug("num_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_num_blocks));
217 pr_debug("free_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_free_blocks));
218 pr_debug("inode_levels: %02x\n", sb->Inode.levels);
219}
220#endif
221
222enum {
223 Opt_mmifs,
224 Opt_err
225};
226
227static const match_table_t tokens = {
228 {Opt_mmifs, "mmi_fs"},
229 {Opt_err, NULL}
230};
231
232static int qnx6_parse_options(char *options, struct super_block *sb)
233{
234 char *p;
235 struct qnx6_sb_info *sbi = QNX6_SB(sb);
236 substring_t args[MAX_OPT_ARGS];
237
238 if (!options)
239 return 1;
240
241 while ((p = strsep(&options, ",")) != NULL) {
242 int token;
243 if (!*p)
244 continue;
245
246 token = match_token(p, tokens, args);
247 switch (token) {
248 case Opt_mmifs:
249 set_opt(sbi->s_mount_opt, MMI_FS);
250 break;
251 default:
252 return 0;
253 }
254 }
255 return 1;
256}
257
258static struct buffer_head *qnx6_check_first_superblock(struct super_block *s,
259 int offset, int silent)
260{
261 struct qnx6_sb_info *sbi = QNX6_SB(s);
262 struct buffer_head *bh;
263 struct qnx6_super_block *sb;
264
265
266
267 bh = sb_bread(s, offset);
268 if (!bh) {
269 pr_err("unable to read the first superblock\n");
270 return NULL;
271 }
272 sb = (struct qnx6_super_block *)bh->b_data;
273 if (fs32_to_cpu(sbi, sb->sb_magic) != QNX6_SUPER_MAGIC) {
274 sbi->s_bytesex = BYTESEX_BE;
275 if (fs32_to_cpu(sbi, sb->sb_magic) == QNX6_SUPER_MAGIC) {
276
277 pr_debug("fs got different endianness.\n");
278 return bh;
279 } else
280 sbi->s_bytesex = BYTESEX_LE;
281 if (!silent) {
282 if (offset == 0) {
283 pr_err("wrong signature (magic) in superblock #1.\n");
284 } else {
285 pr_info("wrong signature (magic) at position (0x%lx) - will try alternative position (0x0000).\n",
286 offset * s->s_blocksize);
287 }
288 }
289 brelse(bh);
290 return NULL;
291 }
292 return bh;
293}
294
295static struct inode *qnx6_private_inode(struct super_block *s,
296 struct qnx6_root_node *p);
297
298static int qnx6_fill_super(struct super_block *s, void *data, int silent)
299{
300 struct buffer_head *bh1 = NULL, *bh2 = NULL;
301 struct qnx6_super_block *sb1 = NULL, *sb2 = NULL;
302 struct qnx6_sb_info *sbi;
303 struct inode *root;
304 const char *errmsg;
305 struct qnx6_sb_info *qs;
306 int ret = -EINVAL;
307 u64 offset;
308 int bootblock_offset = QNX6_BOOTBLOCK_SIZE;
309
310 qs = kzalloc(sizeof(struct qnx6_sb_info), GFP_KERNEL);
311 if (!qs)
312 return -ENOMEM;
313 s->s_fs_info = qs;
314
315
316 if (!sb_set_blocksize(s, QNX6_SUPERBLOCK_SIZE)) {
317 pr_err("unable to set blocksize\n");
318 goto outnobh;
319 }
320
321
322 if (!qnx6_parse_options((char *) data, s)) {
323 pr_err("invalid mount options.\n");
324 goto outnobh;
325 }
326 if (test_opt(s, MMI_FS)) {
327 sb1 = qnx6_mmi_fill_super(s, silent);
328 if (sb1)
329 goto mmi_success;
330 else
331 goto outnobh;
332 }
333 sbi = QNX6_SB(s);
334 sbi->s_bytesex = BYTESEX_LE;
335
336
337 bh1 = qnx6_check_first_superblock(s,
338 bootblock_offset / QNX6_SUPERBLOCK_SIZE, silent);
339 if (!bh1) {
340
341 bh1 = qnx6_check_first_superblock(s, 0, silent);
342 if (!bh1) {
343 pr_err("unable to read the first superblock\n");
344 goto outnobh;
345 }
346
347 bootblock_offset = 0;
348 }
349 sb1 = (struct qnx6_super_block *)bh1->b_data;
350
351#ifdef CONFIG_QNX6FS_DEBUG
352 qnx6_superblock_debug(sb1, s);
353#endif
354
355
356 if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
357 crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
358 pr_err("superblock #1 checksum error\n");
359 goto out;
360 }
361
362
363 if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
364 pr_err("unable to set blocksize\n");
365 goto out;
366 }
367
368 brelse(bh1);
369 bh1 = sb_bread(s, bootblock_offset >> s->s_blocksize_bits);
370 if (!bh1)
371 goto outnobh;
372 sb1 = (struct qnx6_super_block *)bh1->b_data;
373
374
375 offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) +
376 (bootblock_offset >> s->s_blocksize_bits) +
377 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
378
379
380 sbi->s_blks_off = (bootblock_offset >> s->s_blocksize_bits) +
381 (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
382
383
384 bh2 = sb_bread(s, offset);
385 if (!bh2) {
386 pr_err("unable to read the second superblock\n");
387 goto out;
388 }
389 sb2 = (struct qnx6_super_block *)bh2->b_data;
390 if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
391 if (!silent)
392 pr_err("wrong signature (magic) in superblock #2.\n");
393 goto out;
394 }
395
396
397 if (fs32_to_cpu(sbi, sb2->sb_checksum) !=
398 crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
399 pr_err("superblock #2 checksum error\n");
400 goto out;
401 }
402
403 if (fs64_to_cpu(sbi, sb1->sb_serial) >=
404 fs64_to_cpu(sbi, sb2->sb_serial)) {
405
406 sbi->sb_buf = bh1;
407 sbi->sb = (struct qnx6_super_block *)bh1->b_data;
408 brelse(bh2);
409 pr_info("superblock #1 active\n");
410 } else {
411
412 sbi->sb_buf = bh2;
413 sbi->sb = (struct qnx6_super_block *)bh2->b_data;
414 brelse(bh1);
415 pr_info("superblock #2 active\n");
416 }
417mmi_success:
418
419 if (sb1->Inode.levels > QNX6_PTR_MAX_LEVELS) {
420 pr_err("too many inode levels (max %i, sb %i)\n",
421 QNX6_PTR_MAX_LEVELS, sb1->Inode.levels);
422 goto out;
423 }
424 if (sb1->Longfile.levels > QNX6_PTR_MAX_LEVELS) {
425 pr_err("too many longfilename levels (max %i, sb %i)\n",
426 QNX6_PTR_MAX_LEVELS, sb1->Longfile.levels);
427 goto out;
428 }
429 s->s_op = &qnx6_sops;
430 s->s_magic = QNX6_SUPER_MAGIC;
431 s->s_flags |= SB_RDONLY;
432
433
434 sbi = QNX6_SB(s);
435 sbi->s_ptrbits = ilog2(s->s_blocksize / 4);
436 sbi->inodes = qnx6_private_inode(s, &sb1->Inode);
437 if (!sbi->inodes)
438 goto out;
439 sbi->longfile = qnx6_private_inode(s, &sb1->Longfile);
440 if (!sbi->longfile)
441 goto out1;
442
443
444 root = qnx6_iget(s, QNX6_ROOT_INO);
445 if (IS_ERR(root)) {
446 pr_err("get inode failed\n");
447 ret = PTR_ERR(root);
448 goto out2;
449 }
450
451 ret = -ENOMEM;
452 s->s_root = d_make_root(root);
453 if (!s->s_root)
454 goto out2;
455
456 ret = -EINVAL;
457 errmsg = qnx6_checkroot(s);
458 if (errmsg != NULL) {
459 if (!silent)
460 pr_err("%s\n", errmsg);
461 goto out3;
462 }
463 return 0;
464
465out3:
466 dput(s->s_root);
467 s->s_root = NULL;
468out2:
469 iput(sbi->longfile);
470out1:
471 iput(sbi->inodes);
472out:
473 if (bh1)
474 brelse(bh1);
475 if (bh2)
476 brelse(bh2);
477outnobh:
478 kfree(qs);
479 s->s_fs_info = NULL;
480 return ret;
481}
482
483static void qnx6_put_super(struct super_block *sb)
484{
485 struct qnx6_sb_info *qs = QNX6_SB(sb);
486 brelse(qs->sb_buf);
487 iput(qs->longfile);
488 iput(qs->inodes);
489 kfree(qs);
490 sb->s_fs_info = NULL;
491 return;
492}
493
494static sector_t qnx6_bmap(struct address_space *mapping, sector_t block)
495{
496 return generic_block_bmap(mapping, block, qnx6_get_block);
497}
498static const struct address_space_operations qnx6_aops = {
499 .readpage = qnx6_readpage,
500 .readpages = qnx6_readpages,
501 .bmap = qnx6_bmap
502};
503
504static struct inode *qnx6_private_inode(struct super_block *s,
505 struct qnx6_root_node *p)
506{
507 struct inode *inode = new_inode(s);
508 if (inode) {
509 struct qnx6_inode_info *ei = QNX6_I(inode);
510 struct qnx6_sb_info *sbi = QNX6_SB(s);
511 inode->i_size = fs64_to_cpu(sbi, p->size);
512 memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr));
513 ei->di_filelevels = p->levels;
514 inode->i_mode = S_IFREG | S_IRUSR;
515 inode->i_mapping->a_ops = &qnx6_aops;
516 }
517 return inode;
518}
519
520struct inode *qnx6_iget(struct super_block *sb, unsigned ino)
521{
522 struct qnx6_sb_info *sbi = QNX6_SB(sb);
523 struct qnx6_inode_entry *raw_inode;
524 struct inode *inode;
525 struct qnx6_inode_info *ei;
526 struct address_space *mapping;
527 struct page *page;
528 u32 n, offs;
529
530 inode = iget_locked(sb, ino);
531 if (!inode)
532 return ERR_PTR(-ENOMEM);
533 if (!(inode->i_state & I_NEW))
534 return inode;
535
536 ei = QNX6_I(inode);
537
538 inode->i_mode = 0;
539
540 if (ino == 0) {
541 pr_err("bad inode number on dev %s: %u is out of range\n",
542 sb->s_id, ino);
543 iget_failed(inode);
544 return ERR_PTR(-EIO);
545 }
546 n = (ino - 1) >> (PAGE_SHIFT - QNX6_INODE_SIZE_BITS);
547 offs = (ino - 1) & (~PAGE_MASK >> QNX6_INODE_SIZE_BITS);
548 mapping = sbi->inodes->i_mapping;
549 page = read_mapping_page(mapping, n, NULL);
550 if (IS_ERR(page)) {
551 pr_err("major problem: unable to read inode from dev %s\n",
552 sb->s_id);
553 iget_failed(inode);
554 return ERR_CAST(page);
555 }
556 kmap(page);
557 raw_inode = ((struct qnx6_inode_entry *)page_address(page)) + offs;
558
559 inode->i_mode = fs16_to_cpu(sbi, raw_inode->di_mode);
560 i_uid_write(inode, (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid));
561 i_gid_write(inode, (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid));
562 inode->i_size = fs64_to_cpu(sbi, raw_inode->di_size);
563 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_mtime);
564 inode->i_mtime.tv_nsec = 0;
565 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_atime);
566 inode->i_atime.tv_nsec = 0;
567 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_ctime);
568 inode->i_ctime.tv_nsec = 0;
569
570
571 inode->i_blocks = (inode->i_size + 511) >> 9;
572
573 memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr,
574 sizeof(raw_inode->di_block_ptr));
575 ei->di_filelevels = raw_inode->di_filelevels;
576
577 if (S_ISREG(inode->i_mode)) {
578 inode->i_fop = &generic_ro_fops;
579 inode->i_mapping->a_ops = &qnx6_aops;
580 } else if (S_ISDIR(inode->i_mode)) {
581 inode->i_op = &qnx6_dir_inode_operations;
582 inode->i_fop = &qnx6_dir_operations;
583 inode->i_mapping->a_ops = &qnx6_aops;
584 } else if (S_ISLNK(inode->i_mode)) {
585 inode->i_op = &page_symlink_inode_operations;
586 inode_nohighmem(inode);
587 inode->i_mapping->a_ops = &qnx6_aops;
588 } else
589 init_special_inode(inode, inode->i_mode, 0);
590 qnx6_put_page(page);
591 unlock_new_inode(inode);
592 return inode;
593}
594
595static struct kmem_cache *qnx6_inode_cachep;
596
597static struct inode *qnx6_alloc_inode(struct super_block *sb)
598{
599 struct qnx6_inode_info *ei;
600 ei = kmem_cache_alloc(qnx6_inode_cachep, GFP_KERNEL);
601 if (!ei)
602 return NULL;
603 return &ei->vfs_inode;
604}
605
606static void qnx6_free_inode(struct inode *inode)
607{
608 kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
609}
610
611static void init_once(void *foo)
612{
613 struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo;
614
615 inode_init_once(&ei->vfs_inode);
616}
617
618static int init_inodecache(void)
619{
620 qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache",
621 sizeof(struct qnx6_inode_info),
622 0, (SLAB_RECLAIM_ACCOUNT|
623 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
624 init_once);
625 if (!qnx6_inode_cachep)
626 return -ENOMEM;
627 return 0;
628}
629
630static void destroy_inodecache(void)
631{
632
633
634
635
636 rcu_barrier();
637 kmem_cache_destroy(qnx6_inode_cachep);
638}
639
640static struct dentry *qnx6_mount(struct file_system_type *fs_type,
641 int flags, const char *dev_name, void *data)
642{
643 return mount_bdev(fs_type, flags, dev_name, data, qnx6_fill_super);
644}
645
646static struct file_system_type qnx6_fs_type = {
647 .owner = THIS_MODULE,
648 .name = "qnx6",
649 .mount = qnx6_mount,
650 .kill_sb = kill_block_super,
651 .fs_flags = FS_REQUIRES_DEV,
652};
653MODULE_ALIAS_FS("qnx6");
654
655static int __init init_qnx6_fs(void)
656{
657 int err;
658
659 err = init_inodecache();
660 if (err)
661 return err;
662
663 err = register_filesystem(&qnx6_fs_type);
664 if (err) {
665 destroy_inodecache();
666 return err;
667 }
668
669 pr_info("QNX6 filesystem 1.0.0 registered.\n");
670 return 0;
671}
672
673static void __exit exit_qnx6_fs(void)
674{
675 unregister_filesystem(&qnx6_fs_type);
676 destroy_inodecache();
677}
678
679module_init(init_qnx6_fs)
680module_exit(exit_qnx6_fs)
681MODULE_LICENSE("GPL");
682
