blob: aa92d6b76a9af185e2f6a375d8140cfab7a77bfc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * QNX4 file system, Linux implementation.
3 *
4 * Version : 0.2.1
5 *
6 * Using parts of the xiafs filesystem.
7 *
8 * History :
9 *
10 * 01-06-1998 by Richard Frowijn : first release.
11 * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
12 * 30-06-1998 by Frank Denis : first step to write inodes.
13 */
14
15#include <linux/config.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/string.h>
19#include <linux/errno.h>
20#include <linux/slab.h>
21#include <linux/fs.h>
22#include <linux/qnx4_fs.h>
23#include <linux/init.h>
24#include <linux/highuid.h>
25#include <linux/smp_lock.h>
26#include <linux/pagemap.h>
27#include <linux/buffer_head.h>
28#include <linux/vfs.h>
29#include <asm/uaccess.h>
30
31#define QNX4_VERSION 4
32#define QNX4_BMNAME ".bitmap"
33
34static struct super_operations qnx4_sops;
35
36#ifdef CONFIG_QNX4FS_RW
37
38int qnx4_sync_inode(struct inode *inode)
39{
40 int err = 0;
41# if 0
42 struct buffer_head *bh;
43
44 bh = qnx4_update_inode(inode);
45 if (bh && buffer_dirty(bh))
46 {
47 sync_dirty_buffer(bh);
48 if (buffer_req(bh) && !buffer_uptodate(bh))
49 {
50 printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
51 inode->i_sb->s_id, inode->i_ino);
52 err = -1;
53 }
54 brelse (bh);
55 } else if (!bh) {
56 err = -1;
57 }
58# endif
59
60 return err;
61}
62
63static void qnx4_delete_inode(struct inode *inode)
64{
65 QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
66 inode->i_size = 0;
67 qnx4_truncate(inode);
68 lock_kernel();
69 qnx4_free_inode(inode);
70 unlock_kernel();
71}
72
73static void qnx4_write_super(struct super_block *sb)
74{
75 lock_kernel();
76 QNX4DEBUG(("qnx4: write_super\n"));
77 sb->s_dirt = 0;
78 unlock_kernel();
79}
80
81static int qnx4_write_inode(struct inode *inode, int unused)
82{
83 struct qnx4_inode_entry *raw_inode;
84 int block, ino;
85 struct buffer_head *bh;
86 ino = inode->i_ino;
87
88 QNX4DEBUG(("qnx4: write inode 1.\n"));
89 if (inode->i_nlink == 0) {
90 return 0;
91 }
92 if (!ino) {
93 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
94 inode->i_sb->s_id, ino);
95 return -EIO;
96 }
97 QNX4DEBUG(("qnx4: write inode 2.\n"));
98 block = ino / QNX4_INODES_PER_BLOCK;
99 lock_kernel();
100 if (!(bh = sb_bread(inode->i_sb, block))) {
101 printk("qnx4: major problem: unable to read inode from dev "
102 "%s\n", inode->i_sb->s_id);
103 unlock_kernel();
104 return -EIO;
105 }
106 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
107 (ino % QNX4_INODES_PER_BLOCK);
108 raw_inode->di_mode = cpu_to_le16(inode->i_mode);
109 raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
110 raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
111 raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
112 raw_inode->di_size = cpu_to_le32(inode->i_size);
113 raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
114 raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
115 raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
116 raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
117 mark_buffer_dirty(bh);
118 brelse(bh);
119 unlock_kernel();
120 return 0;
121}
122
123#endif
124
125static void qnx4_put_super(struct super_block *sb);
126static struct inode *qnx4_alloc_inode(struct super_block *sb);
127static void qnx4_destroy_inode(struct inode *inode);
128static void qnx4_read_inode(struct inode *);
129static int qnx4_remount(struct super_block *sb, int *flags, char *data);
130static int qnx4_statfs(struct super_block *, struct kstatfs *);
131
132static struct super_operations qnx4_sops =
133{
134 .alloc_inode = qnx4_alloc_inode,
135 .destroy_inode = qnx4_destroy_inode,
136 .read_inode = qnx4_read_inode,
137 .put_super = qnx4_put_super,
138 .statfs = qnx4_statfs,
139 .remount_fs = qnx4_remount,
140#ifdef CONFIG_QNX4FS_RW
141 .write_inode = qnx4_write_inode,
142 .delete_inode = qnx4_delete_inode,
143 .write_super = qnx4_write_super,
144#endif
145};
146
147static int qnx4_remount(struct super_block *sb, int *flags, char *data)
148{
149 struct qnx4_sb_info *qs;
150
151 qs = qnx4_sb(sb);
152 qs->Version = QNX4_VERSION;
153#ifndef CONFIG_QNX4FS_RW
154 *flags |= MS_RDONLY;
155#endif
156 if (*flags & MS_RDONLY) {
157 return 0;
158 }
159
160 mark_buffer_dirty(qs->sb_buf);
161
162 return 0;
163}
164
165static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
166 int create)
167{
168 struct buffer_head *result = NULL;
169
170 if ( nr >= 0 )
171 nr = qnx4_block_map( inode, nr );
172 if (nr) {
173 result = sb_getblk(inode->i_sb, nr);
174 return result;
175 }
176 if (!create) {
177 return NULL;
178 }
179#if 0
180 tmp = qnx4_new_block(inode->i_sb);
181 if (!tmp) {
182 return NULL;
183 }
184 result = sb_getblk(inode->i_sb, tmp);
185 if (tst) {
186 qnx4_free_block(inode->i_sb, tmp);
187 brelse(result);
188 goto repeat;
189 }
190 tst = tmp;
191#endif
192 inode->i_ctime = CURRENT_TIME_SEC;
193 mark_inode_dirty(inode);
194 return result;
195}
196
197struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
198{
199 struct buffer_head *bh;
200
201 bh = qnx4_getblk(inode, block, create);
202 if (!bh || buffer_uptodate(bh)) {
203 return bh;
204 }
205 ll_rw_block(READ, 1, &bh);
206 wait_on_buffer(bh);
207 if (buffer_uptodate(bh)) {
208 return bh;
209 }
210 brelse(bh);
211
212 return NULL;
213}
214
215static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
216{
217 unsigned long phys;
218
219 QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
220
221 phys = qnx4_block_map( inode, iblock );
222 if ( phys ) {
223 // logical block is before EOF
224 map_bh(bh, inode->i_sb, phys);
225 } else if ( create ) {
226 // to be done.
227 }
228 return 0;
229}
230
231unsigned long qnx4_block_map( struct inode *inode, long iblock )
232{
233 int ix;
234 long offset, i_xblk;
235 unsigned long block = 0;
236 struct buffer_head *bh = NULL;
237 struct qnx4_xblk *xblk = NULL;
238 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
239 qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
240
241 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
242 // iblock is in the first extent. This is easy.
243 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
244 } else {
245 // iblock is beyond first extent. We have to follow the extent chain.
246 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
247 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
248 ix = 0;
249 while ( --nxtnt > 0 ) {
250 if ( ix == 0 ) {
251 // read next xtnt block.
252 bh = sb_bread(inode->i_sb, i_xblk - 1);
253 if ( !bh ) {
254 QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
255 return -EIO;
256 }
257 xblk = (struct qnx4_xblk*)bh->b_data;
258 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
259 QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
260 return -EIO;
261 }
262 }
263 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
264 // got it!
265 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
266 break;
267 }
268 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
269 if ( ++ix >= xblk->xblk_num_xtnts ) {
270 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
271 ix = 0;
272 brelse( bh );
273 bh = NULL;
274 }
275 }
276 if ( bh )
277 brelse( bh );
278 }
279
280 QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
281 return block;
282}
283
284static int qnx4_statfs(struct super_block *sb, struct kstatfs *buf)
285{
286 lock_kernel();
287
288 buf->f_type = sb->s_magic;
289 buf->f_bsize = sb->s_blocksize;
290 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
291 buf->f_bfree = qnx4_count_free_blocks(sb);
292 buf->f_bavail = buf->f_bfree;
293 buf->f_namelen = QNX4_NAME_MAX;
294
295 unlock_kernel();
296
297 return 0;
298}
299
300/*
301 * Check the root directory of the filesystem to make sure
302 * it really _is_ a qnx4 filesystem, and to check the size
303 * of the directory entry.
304 */
305static const char *qnx4_checkroot(struct super_block *sb)
306{
307 struct buffer_head *bh;
308 struct qnx4_inode_entry *rootdir;
309 int rd, rl;
310 int i, j;
311 int found = 0;
312
313 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
314 return "no qnx4 filesystem (no root dir).";
315 } else {
316 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
317 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
318 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
319 for (j = 0; j < rl; j++) {
320 bh = sb_bread(sb, rd + j); /* root dir, first block */
321 if (bh == NULL) {
322 return "unable to read root entry.";
323 }
324 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
325 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
326 if (rootdir->di_fname != NULL) {
327 QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
328 if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
329 found = 1;
330 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
331 if (!qnx4_sb(sb)->BitMap) {
332 brelse (bh);
333 return "not enough memory for bitmap inode";
334 }
335 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
336 break;
337 }
338 }
339 }
340 brelse(bh);
341 if (found != 0) {
342 break;
343 }
344 }
345 if (found == 0) {
346 return "bitmap file not found.";
347 }
348 }
349 return NULL;
350}
351
352static int qnx4_fill_super(struct super_block *s, void *data, int silent)
353{
354 struct buffer_head *bh;
355 struct inode *root;
356 const char *errmsg;
357 struct qnx4_sb_info *qs;
358
359 qs = kmalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
360 if (!qs)
361 return -ENOMEM;
362 s->s_fs_info = qs;
363 memset(qs, 0, sizeof(struct qnx4_sb_info));
364
365 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
366
367 /* Check the superblock signature. Since the qnx4 code is
368 dangerous, we should leave as quickly as possible
369 if we don't belong here... */
370 bh = sb_bread(s, 1);
371 if (!bh) {
372 printk("qnx4: unable to read the superblock\n");
373 goto outnobh;
374 }
375 if ( le32_to_cpu( *(__u32*)bh->b_data ) != QNX4_SUPER_MAGIC ) {
376 if (!silent)
377 printk("qnx4: wrong fsid in superblock.\n");
378 goto out;
379 }
380 s->s_op = &qnx4_sops;
381 s->s_magic = QNX4_SUPER_MAGIC;
382#ifndef CONFIG_QNX4FS_RW
383 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
384#endif
385 qnx4_sb(s)->sb_buf = bh;
386 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
387
388
389 /* check before allocating dentries, inodes, .. */
390 errmsg = qnx4_checkroot(s);
391 if (errmsg != NULL) {
392 if (!silent)
393 printk("qnx4: %s\n", errmsg);
394 goto out;
395 }
396
397 /* does root not have inode number QNX4_ROOT_INO ?? */
398 root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
399 if (!root) {
400 printk("qnx4: get inode failed\n");
401 goto out;
402 }
403
404 s->s_root = d_alloc_root(root);
405 if (s->s_root == NULL)
406 goto outi;
407
408 brelse(bh);
409
410 return 0;
411
412 outi:
413 iput(root);
414 out:
415 brelse(bh);
416 outnobh:
417 kfree(qs);
418 s->s_fs_info = NULL;
419 return -EINVAL;
420}
421
422static void qnx4_put_super(struct super_block *sb)
423{
424 struct qnx4_sb_info *qs = qnx4_sb(sb);
425 kfree( qs->BitMap );
426 kfree( qs );
427 sb->s_fs_info = NULL;
428 return;
429}
430
431static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
432{
433 return block_write_full_page(page,qnx4_get_block, wbc);
434}
435static int qnx4_readpage(struct file *file, struct page *page)
436{
437 return block_read_full_page(page,qnx4_get_block);
438}
439static int qnx4_prepare_write(struct file *file, struct page *page,
440 unsigned from, unsigned to)
441{
442 struct qnx4_inode_info *qnx4_inode = qnx4_i(page->mapping->host);
443 return cont_prepare_write(page, from, to, qnx4_get_block,
444 &qnx4_inode->mmu_private);
445}
446static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
447{
448 return generic_block_bmap(mapping,block,qnx4_get_block);
449}
450static struct address_space_operations qnx4_aops = {
451 .readpage = qnx4_readpage,
452 .writepage = qnx4_writepage,
453 .sync_page = block_sync_page,
454 .prepare_write = qnx4_prepare_write,
455 .commit_write = generic_commit_write,
456 .bmap = qnx4_bmap
457};
458
459static void qnx4_read_inode(struct inode *inode)
460{
461 struct buffer_head *bh;
462 struct qnx4_inode_entry *raw_inode;
463 int block, ino;
464 struct super_block *sb = inode->i_sb;
465 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
466
467 ino = inode->i_ino;
468 inode->i_mode = 0;
469
470 QNX4DEBUG(("Reading inode : [%d]\n", ino));
471 if (!ino) {
472 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
473 sb->s_id, ino);
474 return;
475 }
476 block = ino / QNX4_INODES_PER_BLOCK;
477
478 if (!(bh = sb_bread(sb, block))) {
479 printk("qnx4: major problem: unable to read inode from dev "
480 "%s\n", sb->s_id);
481 return;
482 }
483 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
484 (ino % QNX4_INODES_PER_BLOCK);
485
486 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
487 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
488 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
489 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
490 inode->i_size = le32_to_cpu(raw_inode->di_size);
491 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
492 inode->i_mtime.tv_nsec = 0;
493 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
494 inode->i_atime.tv_nsec = 0;
495 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
496 inode->i_ctime.tv_nsec = 0;
497 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
498 inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
499
500 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
501 if (S_ISREG(inode->i_mode)) {
502 inode->i_op = &qnx4_file_inode_operations;
503 inode->i_fop = &qnx4_file_operations;
504 inode->i_mapping->a_ops = &qnx4_aops;
505 qnx4_i(inode)->mmu_private = inode->i_size;
506 } else if (S_ISDIR(inode->i_mode)) {
507 inode->i_op = &qnx4_dir_inode_operations;
508 inode->i_fop = &qnx4_dir_operations;
509 } else if (S_ISLNK(inode->i_mode)) {
510 inode->i_op = &page_symlink_inode_operations;
511 inode->i_mapping->a_ops = &qnx4_aops;
512 qnx4_i(inode)->mmu_private = inode->i_size;
513 } else
514 printk("qnx4: bad inode %d on dev %s\n",ino,sb->s_id);
515 brelse(bh);
516}
517
518static kmem_cache_t *qnx4_inode_cachep;
519
520static struct inode *qnx4_alloc_inode(struct super_block *sb)
521{
522 struct qnx4_inode_info *ei;
523 ei = kmem_cache_alloc(qnx4_inode_cachep, SLAB_KERNEL);
524 if (!ei)
525 return NULL;
526 return &ei->vfs_inode;
527}
528
529static void qnx4_destroy_inode(struct inode *inode)
530{
531 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
532}
533
534static void init_once(void *foo, kmem_cache_t * cachep,
535 unsigned long flags)
536{
537 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
538
539 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
540 SLAB_CTOR_CONSTRUCTOR)
541 inode_init_once(&ei->vfs_inode);
542}
543
544static int init_inodecache(void)
545{
546 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
547 sizeof(struct qnx4_inode_info),
548 0, SLAB_RECLAIM_ACCOUNT,
549 init_once, NULL);
550 if (qnx4_inode_cachep == NULL)
551 return -ENOMEM;
552 return 0;
553}
554
555static void destroy_inodecache(void)
556{
557 if (kmem_cache_destroy(qnx4_inode_cachep))
558 printk(KERN_INFO
559 "qnx4_inode_cache: not all structures were freed\n");
560}
561
562static struct super_block *qnx4_get_sb(struct file_system_type *fs_type,
563 int flags, const char *dev_name, void *data)
564{
565 return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
566}
567
568static struct file_system_type qnx4_fs_type = {
569 .owner = THIS_MODULE,
570 .name = "qnx4",
571 .get_sb = qnx4_get_sb,
572 .kill_sb = kill_block_super,
573 .fs_flags = FS_REQUIRES_DEV,
574};
575
576static int __init init_qnx4_fs(void)
577{
578 int err;
579
580 err = init_inodecache();
581 if (err)
582 return err;
583
584 err = register_filesystem(&qnx4_fs_type);
585 if (err) {
586 destroy_inodecache();
587 return err;
588 }
589
590 printk("QNX4 filesystem 0.2.3 registered.\n");
591 return 0;
592}
593
594static void __exit exit_qnx4_fs(void)
595{
596 unregister_filesystem(&qnx4_fs_type);
597 destroy_inodecache();
598}
599
600module_init(init_qnx4_fs)
601module_exit(exit_qnx4_fs)
602MODULE_LICENSE("GPL");
603