blob: 681df5fcd161402485e5768696897728450b705c [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/init.h>
Al Viro964f5362009-06-07 09:47:13 -040017#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/highuid.h>
19#include <linux/smp_lock.h>
20#include <linux/pagemap.h>
21#include <linux/buffer_head.h>
Al Viro79d25762009-06-07 09:30:08 -040022#include <linux/writeback.h>
Al Viro964f5362009-06-07 09:47:13 -040023#include <linux/statfs.h>
24#include "qnx4.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#define QNX4_VERSION 4
27#define QNX4_BMNAME ".bitmap"
28
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080029static const struct super_operations qnx4_sops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#ifdef CONFIG_QNX4FS_RW
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033static void qnx4_delete_inode(struct inode *inode)
34{
35 QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
Mark Fashehfef26652005-09-09 13:01:31 -070036 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 inode->i_size = 0;
38 qnx4_truncate(inode);
39 lock_kernel();
40 qnx4_free_inode(inode);
41 unlock_kernel();
42}
43
Al Viro79d25762009-06-07 09:30:08 -040044static int qnx4_write_inode(struct inode *inode, int do_sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
46 struct qnx4_inode_entry *raw_inode;
47 int block, ino;
48 struct buffer_head *bh;
49 ino = inode->i_ino;
50
51 QNX4DEBUG(("qnx4: write inode 1.\n"));
52 if (inode->i_nlink == 0) {
53 return 0;
54 }
55 if (!ino) {
56 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
57 inode->i_sb->s_id, ino);
58 return -EIO;
59 }
60 QNX4DEBUG(("qnx4: write inode 2.\n"));
61 block = ino / QNX4_INODES_PER_BLOCK;
62 lock_kernel();
63 if (!(bh = sb_bread(inode->i_sb, block))) {
64 printk("qnx4: major problem: unable to read inode from dev "
65 "%s\n", inode->i_sb->s_id);
66 unlock_kernel();
67 return -EIO;
68 }
69 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
70 (ino % QNX4_INODES_PER_BLOCK);
71 raw_inode->di_mode = cpu_to_le16(inode->i_mode);
72 raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
73 raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
74 raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
75 raw_inode->di_size = cpu_to_le32(inode->i_size);
76 raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
77 raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
78 raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
79 raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
80 mark_buffer_dirty(bh);
Al Viro79d25762009-06-07 09:30:08 -040081 if (do_sync) {
82 sync_dirty_buffer(bh);
83 if (buffer_req(bh) && !buffer_uptodate(bh)) {
84 printk("qnx4: IO error syncing inode [%s:%08x]\n",
85 inode->i_sb->s_id, ino);
86 brelse(bh);
87 unlock_kernel();
88 return -EIO;
89 }
90 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 brelse(bh);
92 unlock_kernel();
93 return 0;
94}
95
96#endif
97
98static void qnx4_put_super(struct super_block *sb);
99static struct inode *qnx4_alloc_inode(struct super_block *sb);
100static void qnx4_destroy_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101static int qnx4_remount(struct super_block *sb, int *flags, char *data);
David Howells726c3342006-06-23 02:02:58 -0700102static int qnx4_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800104static const struct super_operations qnx4_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
106 .alloc_inode = qnx4_alloc_inode,
107 .destroy_inode = qnx4_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 .put_super = qnx4_put_super,
109 .statfs = qnx4_statfs,
110 .remount_fs = qnx4_remount,
111#ifdef CONFIG_QNX4FS_RW
112 .write_inode = qnx4_write_inode,
113 .delete_inode = qnx4_delete_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#endif
115};
116
117static int qnx4_remount(struct super_block *sb, int *flags, char *data)
118{
119 struct qnx4_sb_info *qs;
120
121 qs = qnx4_sb(sb);
122 qs->Version = QNX4_VERSION;
123#ifndef CONFIG_QNX4FS_RW
124 *flags |= MS_RDONLY;
125#endif
126 if (*flags & MS_RDONLY) {
127 return 0;
128 }
129
130 mark_buffer_dirty(qs->sb_buf);
131
132 return 0;
133}
134
135static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
136 int create)
137{
138 struct buffer_head *result = NULL;
139
140 if ( nr >= 0 )
141 nr = qnx4_block_map( inode, nr );
142 if (nr) {
143 result = sb_getblk(inode->i_sb, nr);
144 return result;
145 }
146 if (!create) {
147 return NULL;
148 }
149#if 0
150 tmp = qnx4_new_block(inode->i_sb);
151 if (!tmp) {
152 return NULL;
153 }
154 result = sb_getblk(inode->i_sb, tmp);
155 if (tst) {
156 qnx4_free_block(inode->i_sb, tmp);
157 brelse(result);
158 goto repeat;
159 }
160 tst = tmp;
161#endif
162 inode->i_ctime = CURRENT_TIME_SEC;
163 mark_inode_dirty(inode);
164 return result;
165}
166
167struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
168{
169 struct buffer_head *bh;
170
171 bh = qnx4_getblk(inode, block, create);
172 if (!bh || buffer_uptodate(bh)) {
173 return bh;
174 }
175 ll_rw_block(READ, 1, &bh);
176 wait_on_buffer(bh);
177 if (buffer_uptodate(bh)) {
178 return bh;
179 }
180 brelse(bh);
181
182 return NULL;
183}
184
185static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
186{
187 unsigned long phys;
188
189 QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
190
191 phys = qnx4_block_map( inode, iblock );
192 if ( phys ) {
193 // logical block is before EOF
194 map_bh(bh, inode->i_sb, phys);
195 } else if ( create ) {
196 // to be done.
197 }
198 return 0;
199}
200
201unsigned long qnx4_block_map( struct inode *inode, long iblock )
202{
203 int ix;
204 long offset, i_xblk;
205 unsigned long block = 0;
206 struct buffer_head *bh = NULL;
207 struct qnx4_xblk *xblk = NULL;
208 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000209 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
212 // iblock is in the first extent. This is easy.
213 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
214 } else {
215 // iblock is beyond first extent. We have to follow the extent chain.
216 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
217 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
218 ix = 0;
219 while ( --nxtnt > 0 ) {
220 if ( ix == 0 ) {
221 // read next xtnt block.
222 bh = sb_bread(inode->i_sb, i_xblk - 1);
223 if ( !bh ) {
224 QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
225 return -EIO;
226 }
227 xblk = (struct qnx4_xblk*)bh->b_data;
228 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
229 QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
230 return -EIO;
231 }
232 }
233 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
234 // got it!
235 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
236 break;
237 }
238 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
239 if ( ++ix >= xblk->xblk_num_xtnts ) {
240 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
241 ix = 0;
242 brelse( bh );
243 bh = NULL;
244 }
245 }
246 if ( bh )
247 brelse( bh );
248 }
249
250 QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
251 return block;
252}
253
David Howells726c3342006-06-23 02:02:58 -0700254static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
David Howells726c3342006-06-23 02:02:58 -0700256 struct super_block *sb = dentry->d_sb;
Coly Li5b76dc02009-04-02 16:59:40 -0700257 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -0700258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 lock_kernel();
260
261 buf->f_type = sb->s_magic;
262 buf->f_bsize = sb->s_blocksize;
263 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
264 buf->f_bfree = qnx4_count_free_blocks(sb);
265 buf->f_bavail = buf->f_bfree;
266 buf->f_namelen = QNX4_NAME_MAX;
Coly Li5b76dc02009-04-02 16:59:40 -0700267 buf->f_fsid.val[0] = (u32)id;
268 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 unlock_kernel();
271
272 return 0;
273}
274
275/*
276 * Check the root directory of the filesystem to make sure
277 * it really _is_ a qnx4 filesystem, and to check the size
278 * of the directory entry.
279 */
280static const char *qnx4_checkroot(struct super_block *sb)
281{
282 struct buffer_head *bh;
283 struct qnx4_inode_entry *rootdir;
284 int rd, rl;
285 int i, j;
286 int found = 0;
287
288 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
289 return "no qnx4 filesystem (no root dir).";
290 } else {
291 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
292 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
293 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
294 for (j = 0; j < rl; j++) {
295 bh = sb_bread(sb, rd + j); /* root dir, first block */
296 if (bh == NULL) {
297 return "unable to read root entry.";
298 }
299 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
300 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
301 if (rootdir->di_fname != NULL) {
302 QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
303 if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
304 found = 1;
305 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
306 if (!qnx4_sb(sb)->BitMap) {
307 brelse (bh);
308 return "not enough memory for bitmap inode";
309 }
310 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
311 break;
312 }
313 }
314 }
315 brelse(bh);
316 if (found != 0) {
317 break;
318 }
319 }
320 if (found == 0) {
321 return "bitmap file not found.";
322 }
323 }
324 return NULL;
325}
326
327static int qnx4_fill_super(struct super_block *s, void *data, int silent)
328{
329 struct buffer_head *bh;
330 struct inode *root;
331 const char *errmsg;
332 struct qnx4_sb_info *qs;
David Howells2b7e5bc2008-02-07 00:15:45 -0800333 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700335 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 if (!qs)
337 return -ENOMEM;
338 s->s_fs_info = qs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
341
342 /* Check the superblock signature. Since the qnx4 code is
343 dangerous, we should leave as quickly as possible
344 if we don't belong here... */
345 bh = sb_bread(s, 1);
346 if (!bh) {
347 printk("qnx4: unable to read the superblock\n");
348 goto outnobh;
349 }
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000350 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (!silent)
352 printk("qnx4: wrong fsid in superblock.\n");
353 goto out;
354 }
355 s->s_op = &qnx4_sops;
356 s->s_magic = QNX4_SUPER_MAGIC;
357#ifndef CONFIG_QNX4FS_RW
358 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
359#endif
360 qnx4_sb(s)->sb_buf = bh;
361 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
362
363
364 /* check before allocating dentries, inodes, .. */
365 errmsg = qnx4_checkroot(s);
366 if (errmsg != NULL) {
367 if (!silent)
368 printk("qnx4: %s\n", errmsg);
369 goto out;
370 }
371
372 /* does root not have inode number QNX4_ROOT_INO ?? */
David Howells2b7e5bc2008-02-07 00:15:45 -0800373 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
374 if (IS_ERR(root)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 printk("qnx4: get inode failed\n");
David Howells2b7e5bc2008-02-07 00:15:45 -0800376 ret = PTR_ERR(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 goto out;
378 }
379
David Howells2b7e5bc2008-02-07 00:15:45 -0800380 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 s->s_root = d_alloc_root(root);
382 if (s->s_root == NULL)
383 goto outi;
384
385 brelse(bh);
386
387 return 0;
388
389 outi:
390 iput(root);
391 out:
392 brelse(bh);
393 outnobh:
394 kfree(qs);
395 s->s_fs_info = NULL;
David Howells2b7e5bc2008-02-07 00:15:45 -0800396 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397}
398
399static void qnx4_put_super(struct super_block *sb)
400{
401 struct qnx4_sb_info *qs = qnx4_sb(sb);
402 kfree( qs->BitMap );
403 kfree( qs );
404 sb->s_fs_info = NULL;
405 return;
406}
407
408static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
409{
410 return block_write_full_page(page,qnx4_get_block, wbc);
411}
Nick Pigginf8706182007-10-16 01:25:12 -0700412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413static int qnx4_readpage(struct file *file, struct page *page)
414{
415 return block_read_full_page(page,qnx4_get_block);
416}
Nick Pigginf8706182007-10-16 01:25:12 -0700417
418static int qnx4_write_begin(struct file *file, struct address_space *mapping,
419 loff_t pos, unsigned len, unsigned flags,
420 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Nick Pigginf8706182007-10-16 01:25:12 -0700422 struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
423 *pagep = NULL;
424 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
425 qnx4_get_block,
426 &qnx4_inode->mmu_private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427}
428static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
429{
430 return generic_block_bmap(mapping,block,qnx4_get_block);
431}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700432static const struct address_space_operations qnx4_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 .readpage = qnx4_readpage,
434 .writepage = qnx4_writepage,
435 .sync_page = block_sync_page,
Nick Pigginf8706182007-10-16 01:25:12 -0700436 .write_begin = qnx4_write_begin,
437 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 .bmap = qnx4_bmap
439};
440
David Howells2b7e5bc2008-02-07 00:15:45 -0800441struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 struct buffer_head *bh;
444 struct qnx4_inode_entry *raw_inode;
David Howells2b7e5bc2008-02-07 00:15:45 -0800445 int block;
446 struct qnx4_inode_entry *qnx4_inode;
447 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
David Howells2b7e5bc2008-02-07 00:15:45 -0800449 inode = iget_locked(sb, ino);
450 if (!inode)
451 return ERR_PTR(-ENOMEM);
452 if (!(inode->i_state & I_NEW))
453 return inode;
454
455 qnx4_inode = qnx4_raw_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 inode->i_mode = 0;
457
458 QNX4DEBUG(("Reading inode : [%d]\n", ino));
459 if (!ino) {
David Howells2b7e5bc2008-02-07 00:15:45 -0800460 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
461 "out of range\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 sb->s_id, ino);
David Howells2b7e5bc2008-02-07 00:15:45 -0800463 iget_failed(inode);
464 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 }
466 block = ino / QNX4_INODES_PER_BLOCK;
467
468 if (!(bh = sb_bread(sb, block))) {
469 printk("qnx4: major problem: unable to read inode from dev "
470 "%s\n", sb->s_id);
David Howells2b7e5bc2008-02-07 00:15:45 -0800471 iget_failed(inode);
472 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 }
474 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
475 (ino % QNX4_INODES_PER_BLOCK);
476
477 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
478 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
479 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
480 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
481 inode->i_size = le32_to_cpu(raw_inode->di_size);
482 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
483 inode->i_mtime.tv_nsec = 0;
484 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
485 inode->i_atime.tv_nsec = 0;
486 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
487 inode->i_ctime.tv_nsec = 0;
488 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
491 if (S_ISREG(inode->i_mode)) {
492 inode->i_op = &qnx4_file_inode_operations;
493 inode->i_fop = &qnx4_file_operations;
494 inode->i_mapping->a_ops = &qnx4_aops;
495 qnx4_i(inode)->mmu_private = inode->i_size;
496 } else if (S_ISDIR(inode->i_mode)) {
497 inode->i_op = &qnx4_dir_inode_operations;
498 inode->i_fop = &qnx4_dir_operations;
499 } else if (S_ISLNK(inode->i_mode)) {
500 inode->i_op = &page_symlink_inode_operations;
501 inode->i_mapping->a_ops = &qnx4_aops;
502 qnx4_i(inode)->mmu_private = inode->i_size;
David Howells2b7e5bc2008-02-07 00:15:45 -0800503 } else {
504 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
505 ino, sb->s_id);
506 iget_failed(inode);
507 brelse(bh);
508 return ERR_PTR(-EIO);
509 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 brelse(bh);
David Howells2b7e5bc2008-02-07 00:15:45 -0800511 unlock_new_inode(inode);
512 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
Christoph Lametere18b8902006-12-06 20:33:20 -0800515static struct kmem_cache *qnx4_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517static struct inode *qnx4_alloc_inode(struct super_block *sb)
518{
519 struct qnx4_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800520 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 if (!ei)
522 return NULL;
523 return &ei->vfs_inode;
524}
525
526static void qnx4_destroy_inode(struct inode *inode)
527{
528 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
529}
530
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700531static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
533 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
534
Christoph Lametera35afb82007-05-16 22:10:57 -0700535 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536}
537
538static int init_inodecache(void)
539{
540 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
541 sizeof(struct qnx4_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800542 0, (SLAB_RECLAIM_ACCOUNT|
543 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900544 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 if (qnx4_inode_cachep == NULL)
546 return -ENOMEM;
547 return 0;
548}
549
550static void destroy_inodecache(void)
551{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700552 kmem_cache_destroy(qnx4_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
David Howells454e2392006-06-23 02:02:57 -0700555static int qnx4_get_sb(struct file_system_type *fs_type,
556 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
David Howells454e2392006-06-23 02:02:57 -0700558 return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
559 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
562static struct file_system_type qnx4_fs_type = {
563 .owner = THIS_MODULE,
564 .name = "qnx4",
565 .get_sb = qnx4_get_sb,
566 .kill_sb = kill_block_super,
567 .fs_flags = FS_REQUIRES_DEV,
568};
569
570static int __init init_qnx4_fs(void)
571{
572 int err;
573
574 err = init_inodecache();
575 if (err)
576 return err;
577
578 err = register_filesystem(&qnx4_fs_type);
579 if (err) {
580 destroy_inodecache();
581 return err;
582 }
583
584 printk("QNX4 filesystem 0.2.3 registered.\n");
585 return 0;
586}
587
588static void __exit exit_qnx4_fs(void)
589{
590 unregister_filesystem(&qnx4_fs_type);
591 destroy_inodecache();
592}
593
594module_init(init_qnx4_fs)
595module_exit(exit_qnx4_fs)
596MODULE_LICENSE("GPL");
597