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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/qnx4_fs.h>
22#include <linux/fs.h>
23#include <linux/locks.h>
24#include <linux/init.h>
25#include <linux/highuid.h>
26#include <linux/smp_lock.h>
27
28#include <asm/uaccess.h>
29
30#define QNX4_VERSION 4
31#define QNX4_BMNAME ".bitmap"
32
33static struct super_operations qnx4_sops;
34
35#ifdef CONFIG_QNX4FS_RW
36
37int qnx4_sync_inode(struct inode *inode)
38{
39 int err = 0;
40# if 0
41 struct buffer_head *bh;
42
43 bh = qnx4_update_inode(inode);
44 if (bh && buffer_dirty(bh))
45 {
46 ll_rw_block(WRITE, 1, &bh);
47 wait_on_buffer(bh);
48 if (buffer_req(bh) && !buffer_uptodate(bh))
49 {
50 printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
51 kdevname(inode->i_dev), 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 lock_kernel();
67 inode->i_size = 0;
68 qnx4_truncate(inode);
69 qnx4_free_inode(inode);
70 unlock_kernel();
71}
72
73static void qnx4_write_super(struct super_block *sb)
74{
75 QNX4DEBUG(("qnx4: write_super\n"));
76 sb->s_dirt = 0;
77}
78
79static void qnx4_write_inode(struct inode *inode, int unused)
80{
81 struct qnx4_inode_entry *raw_inode;
82 int block, ino;
83 struct buffer_head *bh;
84 ino = inode->i_ino;
85
86 QNX4DEBUG(("qnx4: write inode 1.\n"));
87 if (inode->i_nlink == 0) {
88 return;
89 }
90 if (!ino) {
91 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
92 kdevname(inode->i_dev), ino);
93 return;
94 }
95 QNX4DEBUG(("qnx4: write inode 2.\n"));
96 block = ino / QNX4_INODES_PER_BLOCK;
97 lock_kernel();
98 if (!(bh = sb_bread(inode->i_sb, block))) {
99 printk("qnx4: major problem: unable to read inode from dev "
100 "%s\n", kdevname(inode->i_dev));
101 unlock_kernel();
102 return;
103 }
104 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
105 (ino % QNX4_INODES_PER_BLOCK);
106 raw_inode->di_mode = cpu_to_le16(inode->i_mode);
107 raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
108 raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
109 raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
110 raw_inode->di_size = cpu_to_le32(inode->i_size);
111 raw_inode->di_mtime = cpu_to_le32(inode->i_mtime);
112 raw_inode->di_atime = cpu_to_le32(inode->i_atime);
113 raw_inode->di_ctime = cpu_to_le32(inode->i_ctime);
114 raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
115 mark_buffer_dirty(bh);
116 brelse(bh);
117 unlock_kernel();
118}
119
120#endif
121
122static struct super_block *qnx4_read_super(struct super_block *, void *, int);
123static void qnx4_put_super(struct super_block *sb);
124static void qnx4_read_inode(struct inode *);
125static int qnx4_remount(struct super_block *sb, int *flags, char *data);
126static int qnx4_statfs(struct super_block *, struct statfs *);
127
128static struct super_operations qnx4_sops =
129{
130 read_inode: qnx4_read_inode,
131#ifdef CONFIG_QNX4FS_RW
132 write_inode: qnx4_write_inode,
133 delete_inode: qnx4_delete_inode,
134#endif
135 put_super: qnx4_put_super,
136#ifdef CONFIG_QNX4FS_RW
137 write_super: qnx4_write_super,
138#endif
139 statfs: qnx4_statfs,
140 remount_fs: qnx4_remount,
141};
142
143static int qnx4_remount(struct super_block *sb, int *flags, char *data)
144{
145 struct qnx4_sb_info *qs;
146
147 qs = &sb->u.qnx4_sb;
148 qs->Version = QNX4_VERSION;
149 if (*flags & MS_RDONLY) {
150 return 0;
151 }
152 mark_buffer_dirty(qs->sb_buf);
153
154 return 0;
155}
156
157struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
158 int create)
159{
160 struct buffer_head *result = NULL;
161
162 if ( nr >= 0 )
163 nr = qnx4_block_map( inode, nr );
164 if (nr) {
165 result = sb_getblk(inode->i_sb, nr);
166 return result;
167 }
168 if (!create) {
169 return NULL;
170 }
171#if 0
172 tmp = qnx4_new_block(inode->i_sb);
173 if (!tmp) {
174 return NULL;
175 }
176 result = sb_getblk(inode->i_sb, tmp);
177 if (tst) {
178 qnx4_free_block(inode->i_sb, tmp);
179 brelse(result);
180 goto repeat;
181 }
182 tst = tmp;
183#endif
184 inode->i_ctime = CURRENT_TIME;
185 mark_inode_dirty(inode);
186 return result;
187}
188
189struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
190{
191 struct buffer_head *bh;
192
193 bh = qnx4_getblk(inode, block, create);
194 if (!bh || buffer_uptodate(bh)) {
195 return bh;
196 }
197 ll_rw_block(READ, 1, &bh);
198 wait_on_buffer(bh);
199 if (buffer_uptodate(bh)) {
200 return bh;
201 }
202 brelse(bh);
203
204 return NULL;
205}
206
207int qnx4_get_block( struct inode *inode, long iblock, struct buffer_head *bh, int create )
208{
209 unsigned long phys;
210
211 QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
212
213 phys = qnx4_block_map( inode, iblock );
214 if ( phys ) {
215
216 bh->b_dev = inode->i_dev;
217 bh->b_blocknr = phys;
218 bh->b_state |= (1UL << BH_Mapped);
219 } else if ( create ) {
220
221 }
222 return 0;
223}
224
225unsigned long qnx4_block_map( struct inode *inode, long iblock )
226{
227 int ix;
228 long offset, i_xblk;
229 unsigned long block = 0;
230 struct buffer_head *bh = 0;
231 struct qnx4_xblk *xblk = 0;
232 struct qnx4_inode_info *qnx4_inode = &inode->u.qnx4_i;
233 qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->i_num_xtnts);
234
235 if ( iblock < le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size) ) {
236
237 block = le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_blk) + iblock - 1;
238 } else {
239
240 i_xblk = le32_to_cpu(qnx4_inode->i_xblk);
241 offset = iblock - le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size);
242 ix = 0;
243 while ( --nxtnt > 0 ) {
244 if ( ix == 0 ) {
245
246 bh = sb_bread(inode->i_sb, i_xblk - 1);
247 if ( !bh ) {
248 QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
249 return -EIO;
250 }
251 xblk = (struct qnx4_xblk*)bh->b_data;
252 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
253 QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
254 return -EIO;
255 }
256 }
257 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
258
259 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
260 break;
261 }
262 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
263 if ( ++ix >= xblk->xblk_num_xtnts ) {
264 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
265 ix = 0;
266 brelse( bh );
267 bh = 0;
268 }
269 }
270 if ( bh )
271 brelse( bh );
272 }
273
274 QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
275 return block;
276}
277
278static int qnx4_statfs(struct super_block *sb, struct statfs *buf)
279{
280 buf->f_type = sb->s_magic;
281 buf->f_bsize = sb->s_blocksize;
282 buf->f_blocks = le32_to_cpu(sb->u.qnx4_sb.BitMap->di_size) * 8;
283 buf->f_bfree = qnx4_count_free_blocks(sb);
284 buf->f_bavail = buf->f_bfree;
285 buf->f_namelen = QNX4_NAME_MAX;
286
287 return 0;
288}
289
290
291
292
293
294
295static const char *qnx4_checkroot(struct super_block *sb)
296{
297 struct buffer_head *bh;
298 struct qnx4_inode_entry *rootdir;
299 int rd, rl;
300 int i, j;
301 int found = 0;
302
303 if (*(sb->u.qnx4_sb.sb->RootDir.di_fname) != '/') {
304 return "no qnx4 filesystem (no root dir).";
305 } else {
306 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", kdevname(sb->s_dev)));
307 rd = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
308 rl = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_size);
309 for (j = 0; j < rl; j++) {
310 bh = sb_bread(sb, rd + j);
311 if (bh == NULL) {
312 return "unable to read root entry.";
313 }
314 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
315 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
316 if (rootdir->di_fname != NULL) {
317 QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
318 if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
319 found = 1;
320 sb->u.qnx4_sb.BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
321 if (!sb->u.qnx4_sb.BitMap) {
322 brelse (bh);
323 return "not enough memory for bitmap inode";
324 }
325 memcpy( sb->u.qnx4_sb.BitMap, rootdir, sizeof( struct qnx4_inode_entry ) );
326 break;
327 }
328 }
329 }
330 brelse(bh);
331 if (found != 0) {
332 break;
333 }
334 }
335 if (found == 0) {
336 return "bitmap file not found.";
337 }
338 }
339 return NULL;
340}
341
342static struct super_block *qnx4_read_super(struct super_block *s,
343 void *data, int silent)
344{
345 struct buffer_head *bh;
346 kdev_t dev = s->s_dev;
347 struct inode *root;
348 const char *errmsg;
349
350 set_blocksize(dev, QNX4_BLOCK_SIZE);
351 s->s_blocksize = QNX4_BLOCK_SIZE;
352 s->s_blocksize_bits = QNX4_BLOCK_SIZE_BITS;
353
354
355
356
357 bh = sb_bread(s, 1);
358 if (!bh) {
359 printk("qnx4: unable to read the superblock\n");
360 goto outnobh;
361 }
362 if ( le32_to_cpu( *(__u32*)bh->b_data ) != QNX4_SUPER_MAGIC ) {
363 if (!silent)
364 printk("qnx4: wrong fsid in superblock sector.\n");
365 goto out;
366 }
367 s->s_op = &qnx4_sops;
368 s->s_magic = QNX4_SUPER_MAGIC;
369#ifndef CONFIG_QNX4FS_RW
370 s->s_flags |= MS_RDONLY;
371#endif
372 s->u.qnx4_sb.sb_buf = bh;
373 s->u.qnx4_sb.sb = (struct qnx4_super_block *) bh->b_data;
374
375
376
377 errmsg = qnx4_checkroot(s);
378 if (errmsg != NULL) {
379 if (!silent)
380 printk("qnx4: %s\n", errmsg);
381 goto out;
382 }
383
384
385 root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
386 if (!root) {
387 printk("qnx4: get inode failed\n");
388 goto out;
389 }
390
391 s->s_root = d_alloc_root(root);
392 if (s->s_root == NULL)
393 goto outi;
394
395 brelse(bh);
396
397 return s;
398
399 outi:
400 iput(root);
401 out:
402 brelse(bh);
403 outnobh:
404
405 return NULL;
406}
407
408static void qnx4_put_super(struct super_block *sb)
409{
410 kfree( sb->u.qnx4_sb.BitMap );
411 return;
412}
413
414static int qnx4_writepage(struct page *page)
415{
416 return block_write_full_page(page,qnx4_get_block);
417}
418static int qnx4_readpage(struct file *file, struct page *page)
419{
420 return block_read_full_page(page,qnx4_get_block);
421}
422static int qnx4_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
423{
424 return cont_prepare_write(page,from,to,qnx4_get_block,
425 &page->mapping->host->u.qnx4_i.mmu_private);
426}
427static int qnx4_bmap(struct address_space *mapping, long block)
428{
429 return generic_block_bmap(mapping,block,qnx4_get_block);
430}
431struct address_space_operations qnx4_aops = {
432 readpage: qnx4_readpage,
433 writepage: qnx4_writepage,
434 sync_page: block_sync_page,
435 prepare_write: qnx4_prepare_write,
436 commit_write: generic_commit_write,
437 bmap: qnx4_bmap
438};
439
440static void qnx4_read_inode(struct inode *inode)
441{
442 struct buffer_head *bh;
443 struct qnx4_inode_entry *raw_inode;
444 int block, ino;
445
446 ino = inode->i_ino;
447 inode->i_mode = 0;
448
449 QNX4DEBUG(("Reading inode : [%d]\n", ino));
450 if (!ino) {
451 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
452 kdevname(inode->i_dev), ino);
453 return;
454 }
455 block = ino / QNX4_INODES_PER_BLOCK;
456
457 if (!(bh = sb_bread(inode->i_sb, block))) {
458 printk("qnx4: major problem: unable to read inode from dev "
459 "%s\n", kdevname(inode->i_dev));
460 return;
461 }
462 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
463 (ino % QNX4_INODES_PER_BLOCK);
464
465 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
466 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
467 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
468 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
469 inode->i_size = le32_to_cpu(raw_inode->di_size);
470 inode->i_mtime = le32_to_cpu(raw_inode->di_mtime);
471 inode->i_atime = le32_to_cpu(raw_inode->di_atime);
472 inode->i_ctime = le32_to_cpu(raw_inode->di_ctime);
473 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
474 inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
475
476 memcpy(&inode->u.qnx4_i, (struct qnx4_inode_info *) raw_inode, QNX4_DIR_ENTRY_SIZE);
477 if (S_ISREG(inode->i_mode)) {
478 inode->i_op = &qnx4_file_inode_operations;
479 inode->i_fop = &qnx4_file_operations;
480 inode->i_mapping->a_ops = &qnx4_aops;
481 inode->u.qnx4_i.mmu_private = inode->i_size;
482 } else if (S_ISDIR(inode->i_mode)) {
483 inode->i_op = &qnx4_dir_inode_operations;
484 inode->i_fop = &qnx4_dir_operations;
485 } else if (S_ISLNK(inode->i_mode)) {
486 inode->i_op = &page_symlink_inode_operations;
487 inode->i_mapping->a_ops = &qnx4_aops;
488 inode->u.qnx4_i.mmu_private = inode->i_size;
489 } else
490 printk("qnx4: bad inode %d on dev %s\n",ino,kdevname(inode->i_dev));
491 brelse(bh);
492}
493
494static DECLARE_FSTYPE_DEV(qnx4_fs_type, "qnx4", qnx4_read_super);
495
496static int __init init_qnx4_fs(void)
497{
498 printk("QNX4 filesystem 0.2.2 registered.\n");
499 return register_filesystem(&qnx4_fs_type);
500}
501
502static void __exit exit_qnx4_fs(void)
503{
504 unregister_filesystem(&qnx4_fs_type);
505}
506
507EXPORT_NO_SYMBOLS;
508
509module_init(init_qnx4_fs)
510module_exit(exit_qnx4_fs)
511MODULE_LICENSE("GPL");
512
513
