blob: 2ecd46f85e9f271a90e217d9ec8ba7f9b0911a75 [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));
Mark Fashehfef26652005-09-09 13:01:31 -070066 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 inode->i_size = 0;
68 qnx4_truncate(inode);
69 lock_kernel();
70 qnx4_free_inode(inode);
71 unlock_kernel();
72}
73
74static void qnx4_write_super(struct super_block *sb)
75{
76 lock_kernel();
77 QNX4DEBUG(("qnx4: write_super\n"));
78 sb->s_dirt = 0;
79 unlock_kernel();
80}
81
82static int qnx4_write_inode(struct inode *inode, int unused)
83{
84 struct qnx4_inode_entry *raw_inode;
85 int block, ino;
86 struct buffer_head *bh;
87 ino = inode->i_ino;
88
89 QNX4DEBUG(("qnx4: write inode 1.\n"));
90 if (inode->i_nlink == 0) {
91 return 0;
92 }
93 if (!ino) {
94 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
95 inode->i_sb->s_id, ino);
96 return -EIO;
97 }
98 QNX4DEBUG(("qnx4: write inode 2.\n"));
99 block = ino / QNX4_INODES_PER_BLOCK;
100 lock_kernel();
101 if (!(bh = sb_bread(inode->i_sb, block))) {
102 printk("qnx4: major problem: unable to read inode from dev "
103 "%s\n", inode->i_sb->s_id);
104 unlock_kernel();
105 return -EIO;
106 }
107 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
108 (ino % QNX4_INODES_PER_BLOCK);
109 raw_inode->di_mode = cpu_to_le16(inode->i_mode);
110 raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
111 raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
112 raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
113 raw_inode->di_size = cpu_to_le32(inode->i_size);
114 raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
115 raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
116 raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
117 raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
118 mark_buffer_dirty(bh);
119 brelse(bh);
120 unlock_kernel();
121 return 0;
122}
123
124#endif
125
126static void qnx4_put_super(struct super_block *sb);
127static struct inode *qnx4_alloc_inode(struct super_block *sb);
128static void qnx4_destroy_inode(struct inode *inode);
129static void qnx4_read_inode(struct inode *);
130static int qnx4_remount(struct super_block *sb, int *flags, char *data);
131static int qnx4_statfs(struct super_block *, struct kstatfs *);
132
133static struct super_operations qnx4_sops =
134{
135 .alloc_inode = qnx4_alloc_inode,
136 .destroy_inode = qnx4_destroy_inode,
137 .read_inode = qnx4_read_inode,
138 .put_super = qnx4_put_super,
139 .statfs = qnx4_statfs,
140 .remount_fs = qnx4_remount,
141#ifdef CONFIG_QNX4FS_RW
142 .write_inode = qnx4_write_inode,
143 .delete_inode = qnx4_delete_inode,
144 .write_super = qnx4_write_super,
145#endif
146};
147
148static int qnx4_remount(struct super_block *sb, int *flags, char *data)
149{
150 struct qnx4_sb_info *qs;
151
152 qs = qnx4_sb(sb);
153 qs->Version = QNX4_VERSION;
154#ifndef CONFIG_QNX4FS_RW
155 *flags |= MS_RDONLY;
156#endif
157 if (*flags & MS_RDONLY) {
158 return 0;
159 }
160
161 mark_buffer_dirty(qs->sb_buf);
162
163 return 0;
164}
165
166static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
167 int create)
168{
169 struct buffer_head *result = NULL;
170
171 if ( nr >= 0 )
172 nr = qnx4_block_map( inode, nr );
173 if (nr) {
174 result = sb_getblk(inode->i_sb, nr);
175 return result;
176 }
177 if (!create) {
178 return NULL;
179 }
180#if 0
181 tmp = qnx4_new_block(inode->i_sb);
182 if (!tmp) {
183 return NULL;
184 }
185 result = sb_getblk(inode->i_sb, tmp);
186 if (tst) {
187 qnx4_free_block(inode->i_sb, tmp);
188 brelse(result);
189 goto repeat;
190 }
191 tst = tmp;
192#endif
193 inode->i_ctime = CURRENT_TIME_SEC;
194 mark_inode_dirty(inode);
195 return result;
196}
197
198struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
199{
200 struct buffer_head *bh;
201
202 bh = qnx4_getblk(inode, block, create);
203 if (!bh || buffer_uptodate(bh)) {
204 return bh;
205 }
206 ll_rw_block(READ, 1, &bh);
207 wait_on_buffer(bh);
208 if (buffer_uptodate(bh)) {
209 return bh;
210 }
211 brelse(bh);
212
213 return NULL;
214}
215
216static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
217{
218 unsigned long phys;
219
220 QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
221
222 phys = qnx4_block_map( inode, iblock );
223 if ( phys ) {
224 // logical block is before EOF
225 map_bh(bh, inode->i_sb, phys);
226 } else if ( create ) {
227 // to be done.
228 }
229 return 0;
230}
231
232unsigned long qnx4_block_map( struct inode *inode, long iblock )
233{
234 int ix;
235 long offset, i_xblk;
236 unsigned long block = 0;
237 struct buffer_head *bh = NULL;
238 struct qnx4_xblk *xblk = NULL;
239 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000240 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
243 // iblock is in the first extent. This is easy.
244 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
245 } else {
246 // iblock is beyond first extent. We have to follow the extent chain.
247 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
248 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
249 ix = 0;
250 while ( --nxtnt > 0 ) {
251 if ( ix == 0 ) {
252 // read next xtnt block.
253 bh = sb_bread(inode->i_sb, i_xblk - 1);
254 if ( !bh ) {
255 QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
256 return -EIO;
257 }
258 xblk = (struct qnx4_xblk*)bh->b_data;
259 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
260 QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
261 return -EIO;
262 }
263 }
264 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
265 // got it!
266 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
267 break;
268 }
269 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
270 if ( ++ix >= xblk->xblk_num_xtnts ) {
271 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
272 ix = 0;
273 brelse( bh );
274 bh = NULL;
275 }
276 }
277 if ( bh )
278 brelse( bh );
279 }
280
281 QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
282 return block;
283}
284
285static int qnx4_statfs(struct super_block *sb, struct kstatfs *buf)
286{
287 lock_kernel();
288
289 buf->f_type = sb->s_magic;
290 buf->f_bsize = sb->s_blocksize;
291 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
292 buf->f_bfree = qnx4_count_free_blocks(sb);
293 buf->f_bavail = buf->f_bfree;
294 buf->f_namelen = QNX4_NAME_MAX;
295
296 unlock_kernel();
297
298 return 0;
299}
300
301/*
302 * Check the root directory of the filesystem to make sure
303 * it really _is_ a qnx4 filesystem, and to check the size
304 * of the directory entry.
305 */
306static const char *qnx4_checkroot(struct super_block *sb)
307{
308 struct buffer_head *bh;
309 struct qnx4_inode_entry *rootdir;
310 int rd, rl;
311 int i, j;
312 int found = 0;
313
314 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
315 return "no qnx4 filesystem (no root dir).";
316 } else {
317 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
318 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
319 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
320 for (j = 0; j < rl; j++) {
321 bh = sb_bread(sb, rd + j); /* root dir, first block */
322 if (bh == NULL) {
323 return "unable to read root entry.";
324 }
325 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
326 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
327 if (rootdir->di_fname != NULL) {
328 QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
329 if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
330 found = 1;
331 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
332 if (!qnx4_sb(sb)->BitMap) {
333 brelse (bh);
334 return "not enough memory for bitmap inode";
335 }
336 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
337 break;
338 }
339 }
340 }
341 brelse(bh);
342 if (found != 0) {
343 break;
344 }
345 }
346 if (found == 0) {
347 return "bitmap file not found.";
348 }
349 }
350 return NULL;
351}
352
353static int qnx4_fill_super(struct super_block *s, void *data, int silent)
354{
355 struct buffer_head *bh;
356 struct inode *root;
357 const char *errmsg;
358 struct qnx4_sb_info *qs;
359
360 qs = kmalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
361 if (!qs)
362 return -ENOMEM;
363 s->s_fs_info = qs;
364 memset(qs, 0, sizeof(struct qnx4_sb_info));
365
366 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
367
368 /* Check the superblock signature. Since the qnx4 code is
369 dangerous, we should leave as quickly as possible
370 if we don't belong here... */
371 bh = sb_bread(s, 1);
372 if (!bh) {
373 printk("qnx4: unable to read the superblock\n");
374 goto outnobh;
375 }
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000376 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 if (!silent)
378 printk("qnx4: wrong fsid in superblock.\n");
379 goto out;
380 }
381 s->s_op = &qnx4_sops;
382 s->s_magic = QNX4_SUPER_MAGIC;
383#ifndef CONFIG_QNX4FS_RW
384 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
385#endif
386 qnx4_sb(s)->sb_buf = bh;
387 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
388
389
390 /* check before allocating dentries, inodes, .. */
391 errmsg = qnx4_checkroot(s);
392 if (errmsg != NULL) {
393 if (!silent)
394 printk("qnx4: %s\n", errmsg);
395 goto out;
396 }
397
398 /* does root not have inode number QNX4_ROOT_INO ?? */
399 root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
400 if (!root) {
401 printk("qnx4: get inode failed\n");
402 goto out;
403 }
404
405 s->s_root = d_alloc_root(root);
406 if (s->s_root == NULL)
407 goto outi;
408
409 brelse(bh);
410
411 return 0;
412
413 outi:
414 iput(root);
415 out:
416 brelse(bh);
417 outnobh:
418 kfree(qs);
419 s->s_fs_info = NULL;
420 return -EINVAL;
421}
422
423static void qnx4_put_super(struct super_block *sb)
424{
425 struct qnx4_sb_info *qs = qnx4_sb(sb);
426 kfree( qs->BitMap );
427 kfree( qs );
428 sb->s_fs_info = NULL;
429 return;
430}
431
432static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
433{
434 return block_write_full_page(page,qnx4_get_block, wbc);
435}
436static int qnx4_readpage(struct file *file, struct page *page)
437{
438 return block_read_full_page(page,qnx4_get_block);
439}
440static int qnx4_prepare_write(struct file *file, struct page *page,
441 unsigned from, unsigned to)
442{
443 struct qnx4_inode_info *qnx4_inode = qnx4_i(page->mapping->host);
444 return cont_prepare_write(page, from, to, qnx4_get_block,
445 &qnx4_inode->mmu_private);
446}
447static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
448{
449 return generic_block_bmap(mapping,block,qnx4_get_block);
450}
451static struct address_space_operations qnx4_aops = {
452 .readpage = qnx4_readpage,
453 .writepage = qnx4_writepage,
454 .sync_page = block_sync_page,
455 .prepare_write = qnx4_prepare_write,
456 .commit_write = generic_commit_write,
457 .bmap = qnx4_bmap
458};
459
460static void qnx4_read_inode(struct inode *inode)
461{
462 struct buffer_head *bh;
463 struct qnx4_inode_entry *raw_inode;
464 int block, ino;
465 struct super_block *sb = inode->i_sb;
466 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
467
468 ino = inode->i_ino;
469 inode->i_mode = 0;
470
471 QNX4DEBUG(("Reading inode : [%d]\n", ino));
472 if (!ino) {
473 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
474 sb->s_id, ino);
475 return;
476 }
477 block = ino / QNX4_INODES_PER_BLOCK;
478
479 if (!(bh = sb_bread(sb, block))) {
480 printk("qnx4: major problem: unable to read inode from dev "
481 "%s\n", sb->s_id);
482 return;
483 }
484 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
485 (ino % QNX4_INODES_PER_BLOCK);
486
487 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
488 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
489 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
490 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
491 inode->i_size = le32_to_cpu(raw_inode->di_size);
492 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
493 inode->i_mtime.tv_nsec = 0;
494 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
495 inode->i_atime.tv_nsec = 0;
496 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
497 inode->i_ctime.tv_nsec = 0;
498 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
499 inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
500
501 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
502 if (S_ISREG(inode->i_mode)) {
503 inode->i_op = &qnx4_file_inode_operations;
504 inode->i_fop = &qnx4_file_operations;
505 inode->i_mapping->a_ops = &qnx4_aops;
506 qnx4_i(inode)->mmu_private = inode->i_size;
507 } else if (S_ISDIR(inode->i_mode)) {
508 inode->i_op = &qnx4_dir_inode_operations;
509 inode->i_fop = &qnx4_dir_operations;
510 } else if (S_ISLNK(inode->i_mode)) {
511 inode->i_op = &page_symlink_inode_operations;
512 inode->i_mapping->a_ops = &qnx4_aops;
513 qnx4_i(inode)->mmu_private = inode->i_size;
514 } else
515 printk("qnx4: bad inode %d on dev %s\n",ino,sb->s_id);
516 brelse(bh);
517}
518
519static kmem_cache_t *qnx4_inode_cachep;
520
521static struct inode *qnx4_alloc_inode(struct super_block *sb)
522{
523 struct qnx4_inode_info *ei;
524 ei = kmem_cache_alloc(qnx4_inode_cachep, SLAB_KERNEL);
525 if (!ei)
526 return NULL;
527 return &ei->vfs_inode;
528}
529
530static void qnx4_destroy_inode(struct inode *inode)
531{
532 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
533}
534
535static void init_once(void *foo, kmem_cache_t * cachep,
536 unsigned long flags)
537{
538 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
539
540 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
541 SLAB_CTOR_CONSTRUCTOR)
542 inode_init_once(&ei->vfs_inode);
543}
544
545static int init_inodecache(void)
546{
547 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
548 sizeof(struct qnx4_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800549 0, (SLAB_RECLAIM_ACCOUNT|
550 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 init_once, NULL);
552 if (qnx4_inode_cachep == NULL)
553 return -ENOMEM;
554 return 0;
555}
556
557static void destroy_inodecache(void)
558{
559 if (kmem_cache_destroy(qnx4_inode_cachep))
560 printk(KERN_INFO
561 "qnx4_inode_cache: not all structures were freed\n");
562}
563
564static struct super_block *qnx4_get_sb(struct file_system_type *fs_type,
565 int flags, const char *dev_name, void *data)
566{
567 return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
568}
569
570static struct file_system_type qnx4_fs_type = {
571 .owner = THIS_MODULE,
572 .name = "qnx4",
573 .get_sb = qnx4_get_sb,
574 .kill_sb = kill_block_super,
575 .fs_flags = FS_REQUIRES_DEV,
576};
577
578static int __init init_qnx4_fs(void)
579{
580 int err;
581
582 err = init_inodecache();
583 if (err)
584 return err;
585
586 err = register_filesystem(&qnx4_fs_type);
587 if (err) {
588 destroy_inodecache();
589 return err;
590 }
591
592 printk("QNX4 filesystem 0.2.3 registered.\n");
593 return 0;
594}
595
596static void __exit exit_qnx4_fs(void)
597{
598 unregister_filesystem(&qnx4_fs_type);
599 destroy_inodecache();
600}
601
602module_init(init_qnx4_fs)
603module_exit(exit_qnx4_fs)
604MODULE_LICENSE("GPL");
605