blob: 2aad1044b84ccf1342578cd66407ef88e406cf1d [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/slab.h>
20#include <linux/fs.h>
21#include <linux/qnx4_fs.h>
22#include <linux/init.h>
23#include <linux/highuid.h>
24#include <linux/smp_lock.h>
25#include <linux/pagemap.h>
26#include <linux/buffer_head.h>
27#include <linux/vfs.h>
28#include <asm/uaccess.h>
29
30#define QNX4_VERSION 4
31#define QNX4_BMNAME ".bitmap"
32
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080033static const struct super_operations qnx4_sops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
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 sync_dirty_buffer(bh);
47 if (buffer_req(bh) && !buffer_uptodate(bh))
48 {
49 printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
50 inode->i_sb->s_id, inode->i_ino);
51 err = -1;
52 }
53 brelse (bh);
54 } else if (!bh) {
55 err = -1;
56 }
57# endif
58
59 return err;
60}
61
62static void qnx4_delete_inode(struct inode *inode)
63{
64 QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
Mark Fashehfef26652005-09-09 13:01:31 -070065 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128static int qnx4_remount(struct super_block *sb, int *flags, char *data);
David Howells726c3342006-06-23 02:02:58 -0700129static int qnx4_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800131static const struct super_operations qnx4_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
133 .alloc_inode = qnx4_alloc_inode,
134 .destroy_inode = qnx4_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 .put_super = qnx4_put_super,
136 .statfs = qnx4_statfs,
137 .remount_fs = qnx4_remount,
138#ifdef CONFIG_QNX4FS_RW
139 .write_inode = qnx4_write_inode,
140 .delete_inode = qnx4_delete_inode,
141 .write_super = qnx4_write_super,
142#endif
143};
144
145static int qnx4_remount(struct super_block *sb, int *flags, char *data)
146{
147 struct qnx4_sb_info *qs;
148
149 qs = qnx4_sb(sb);
150 qs->Version = QNX4_VERSION;
151#ifndef CONFIG_QNX4FS_RW
152 *flags |= MS_RDONLY;
153#endif
154 if (*flags & MS_RDONLY) {
155 return 0;
156 }
157
158 mark_buffer_dirty(qs->sb_buf);
159
160 return 0;
161}
162
163static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
164 int create)
165{
166 struct buffer_head *result = NULL;
167
168 if ( nr >= 0 )
169 nr = qnx4_block_map( inode, nr );
170 if (nr) {
171 result = sb_getblk(inode->i_sb, nr);
172 return result;
173 }
174 if (!create) {
175 return NULL;
176 }
177#if 0
178 tmp = qnx4_new_block(inode->i_sb);
179 if (!tmp) {
180 return NULL;
181 }
182 result = sb_getblk(inode->i_sb, tmp);
183 if (tst) {
184 qnx4_free_block(inode->i_sb, tmp);
185 brelse(result);
186 goto repeat;
187 }
188 tst = tmp;
189#endif
190 inode->i_ctime = CURRENT_TIME_SEC;
191 mark_inode_dirty(inode);
192 return result;
193}
194
195struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
196{
197 struct buffer_head *bh;
198
199 bh = qnx4_getblk(inode, block, create);
200 if (!bh || buffer_uptodate(bh)) {
201 return bh;
202 }
203 ll_rw_block(READ, 1, &bh);
204 wait_on_buffer(bh);
205 if (buffer_uptodate(bh)) {
206 return bh;
207 }
208 brelse(bh);
209
210 return NULL;
211}
212
213static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
214{
215 unsigned long phys;
216
217 QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
218
219 phys = qnx4_block_map( inode, iblock );
220 if ( phys ) {
221 // logical block is before EOF
222 map_bh(bh, inode->i_sb, phys);
223 } else if ( create ) {
224 // to be done.
225 }
226 return 0;
227}
228
229unsigned long qnx4_block_map( struct inode *inode, long iblock )
230{
231 int ix;
232 long offset, i_xblk;
233 unsigned long block = 0;
234 struct buffer_head *bh = NULL;
235 struct qnx4_xblk *xblk = NULL;
236 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000237 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
240 // iblock is in the first extent. This is easy.
241 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
242 } else {
243 // iblock is beyond first extent. We have to follow the extent chain.
244 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
245 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
246 ix = 0;
247 while ( --nxtnt > 0 ) {
248 if ( ix == 0 ) {
249 // read next xtnt block.
250 bh = sb_bread(inode->i_sb, i_xblk - 1);
251 if ( !bh ) {
252 QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
253 return -EIO;
254 }
255 xblk = (struct qnx4_xblk*)bh->b_data;
256 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
257 QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
258 return -EIO;
259 }
260 }
261 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
262 // got it!
263 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
264 break;
265 }
266 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
267 if ( ++ix >= xblk->xblk_num_xtnts ) {
268 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
269 ix = 0;
270 brelse( bh );
271 bh = NULL;
272 }
273 }
274 if ( bh )
275 brelse( bh );
276 }
277
278 QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
279 return block;
280}
281
David Howells726c3342006-06-23 02:02:58 -0700282static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
David Howells726c3342006-06-23 02:02:58 -0700284 struct super_block *sb = dentry->d_sb;
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 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;
David Howells2b7e5bc2008-02-07 00:15:45 -0800358 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700360 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (!qs)
362 return -ENOMEM;
363 s->s_fs_info = qs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
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 }
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000375 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 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 ?? */
David Howells2b7e5bc2008-02-07 00:15:45 -0800398 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
399 if (IS_ERR(root)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 printk("qnx4: get inode failed\n");
David Howells2b7e5bc2008-02-07 00:15:45 -0800401 ret = PTR_ERR(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 goto out;
403 }
404
David Howells2b7e5bc2008-02-07 00:15:45 -0800405 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 s->s_root = d_alloc_root(root);
407 if (s->s_root == NULL)
408 goto outi;
409
410 brelse(bh);
411
412 return 0;
413
414 outi:
415 iput(root);
416 out:
417 brelse(bh);
418 outnobh:
419 kfree(qs);
420 s->s_fs_info = NULL;
David Howells2b7e5bc2008-02-07 00:15:45 -0800421 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423
424static void qnx4_put_super(struct super_block *sb)
425{
426 struct qnx4_sb_info *qs = qnx4_sb(sb);
427 kfree( qs->BitMap );
428 kfree( qs );
429 sb->s_fs_info = NULL;
430 return;
431}
432
433static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
434{
435 return block_write_full_page(page,qnx4_get_block, wbc);
436}
Nick Pigginf8706182007-10-16 01:25:12 -0700437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438static int qnx4_readpage(struct file *file, struct page *page)
439{
440 return block_read_full_page(page,qnx4_get_block);
441}
Nick Pigginf8706182007-10-16 01:25:12 -0700442
443static int qnx4_write_begin(struct file *file, struct address_space *mapping,
444 loff_t pos, unsigned len, unsigned flags,
445 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446{
Nick Pigginf8706182007-10-16 01:25:12 -0700447 struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
448 *pagep = NULL;
449 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
450 qnx4_get_block,
451 &qnx4_inode->mmu_private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
454{
455 return generic_block_bmap(mapping,block,qnx4_get_block);
456}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700457static const struct address_space_operations qnx4_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 .readpage = qnx4_readpage,
459 .writepage = qnx4_writepage,
460 .sync_page = block_sync_page,
Nick Pigginf8706182007-10-16 01:25:12 -0700461 .write_begin = qnx4_write_begin,
462 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 .bmap = qnx4_bmap
464};
465
David Howells2b7e5bc2008-02-07 00:15:45 -0800466struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
468 struct buffer_head *bh;
469 struct qnx4_inode_entry *raw_inode;
David Howells2b7e5bc2008-02-07 00:15:45 -0800470 int block;
471 struct qnx4_inode_entry *qnx4_inode;
472 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
David Howells2b7e5bc2008-02-07 00:15:45 -0800474 inode = iget_locked(sb, ino);
475 if (!inode)
476 return ERR_PTR(-ENOMEM);
477 if (!(inode->i_state & I_NEW))
478 return inode;
479
480 qnx4_inode = qnx4_raw_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 inode->i_mode = 0;
482
483 QNX4DEBUG(("Reading inode : [%d]\n", ino));
484 if (!ino) {
David Howells2b7e5bc2008-02-07 00:15:45 -0800485 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
486 "out of range\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 sb->s_id, ino);
David Howells2b7e5bc2008-02-07 00:15:45 -0800488 iget_failed(inode);
489 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
491 block = ino / QNX4_INODES_PER_BLOCK;
492
493 if (!(bh = sb_bread(sb, block))) {
494 printk("qnx4: major problem: unable to read inode from dev "
495 "%s\n", sb->s_id);
David Howells2b7e5bc2008-02-07 00:15:45 -0800496 iget_failed(inode);
497 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 }
499 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
500 (ino % QNX4_INODES_PER_BLOCK);
501
502 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
503 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
504 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
505 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
506 inode->i_size = le32_to_cpu(raw_inode->di_size);
507 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
508 inode->i_mtime.tv_nsec = 0;
509 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
510 inode->i_atime.tv_nsec = 0;
511 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
512 inode->i_ctime.tv_nsec = 0;
513 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
516 if (S_ISREG(inode->i_mode)) {
517 inode->i_op = &qnx4_file_inode_operations;
518 inode->i_fop = &qnx4_file_operations;
519 inode->i_mapping->a_ops = &qnx4_aops;
520 qnx4_i(inode)->mmu_private = inode->i_size;
521 } else if (S_ISDIR(inode->i_mode)) {
522 inode->i_op = &qnx4_dir_inode_operations;
523 inode->i_fop = &qnx4_dir_operations;
524 } else if (S_ISLNK(inode->i_mode)) {
525 inode->i_op = &page_symlink_inode_operations;
526 inode->i_mapping->a_ops = &qnx4_aops;
527 qnx4_i(inode)->mmu_private = inode->i_size;
David Howells2b7e5bc2008-02-07 00:15:45 -0800528 } else {
529 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
530 ino, sb->s_id);
531 iget_failed(inode);
532 brelse(bh);
533 return ERR_PTR(-EIO);
534 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 brelse(bh);
David Howells2b7e5bc2008-02-07 00:15:45 -0800536 unlock_new_inode(inode);
537 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538}
539
Christoph Lametere18b8902006-12-06 20:33:20 -0800540static struct kmem_cache *qnx4_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542static struct inode *qnx4_alloc_inode(struct super_block *sb)
543{
544 struct qnx4_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800545 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 if (!ei)
547 return NULL;
548 return &ei->vfs_inode;
549}
550
551static void qnx4_destroy_inode(struct inode *inode)
552{
553 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
554}
555
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700556static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
558 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
559
Christoph Lametera35afb82007-05-16 22:10:57 -0700560 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561}
562
563static int init_inodecache(void)
564{
565 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
566 sizeof(struct qnx4_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800567 0, (SLAB_RECLAIM_ACCOUNT|
568 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900569 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 if (qnx4_inode_cachep == NULL)
571 return -ENOMEM;
572 return 0;
573}
574
575static void destroy_inodecache(void)
576{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700577 kmem_cache_destroy(qnx4_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
David Howells454e2392006-06-23 02:02:57 -0700580static int qnx4_get_sb(struct file_system_type *fs_type,
581 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582{
David Howells454e2392006-06-23 02:02:57 -0700583 return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
584 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585}
586
587static struct file_system_type qnx4_fs_type = {
588 .owner = THIS_MODULE,
589 .name = "qnx4",
590 .get_sb = qnx4_get_sb,
591 .kill_sb = kill_block_super,
592 .fs_flags = FS_REQUIRES_DEV,
593};
594
595static int __init init_qnx4_fs(void)
596{
597 int err;
598
599 err = init_inodecache();
600 if (err)
601 return err;
602
603 err = register_filesystem(&qnx4_fs_type);
604 if (err) {
605 destroy_inodecache();
606 return err;
607 }
608
609 printk("QNX4 filesystem 0.2.3 registered.\n");
610 return 0;
611}
612
613static void __exit exit_qnx4_fs(void)
614{
615 unregister_filesystem(&qnx4_fs_type);
616 destroy_inodecache();
617}
618
619module_init(init_qnx4_fs)
620module_exit(exit_qnx4_fs)
621MODULE_LICENSE("GPL");
622