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1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
15 | #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 | ||
33 | static struct super_operations qnx4_sops; | |
34 | ||
35 | #ifdef CONFIG_QNX4FS_RW | |
36 | ||
37 | int 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 | ||
62 | static void qnx4_delete_inode(struct inode *inode) | |
63 | { | |
64 | QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino)); | |
fef26658 | 65 | truncate_inode_pages(&inode->i_data, 0); |
1da177e4 LT |
66 | inode->i_size = 0; |
67 | qnx4_truncate(inode); | |
68 | lock_kernel(); | |
69 | qnx4_free_inode(inode); | |
70 | unlock_kernel(); | |
71 | } | |
72 | ||
73 | static 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 | ||
81 | static 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 | ||
125 | static void qnx4_put_super(struct super_block *sb); | |
126 | static struct inode *qnx4_alloc_inode(struct super_block *sb); | |
127 | static void qnx4_destroy_inode(struct inode *inode); | |
128 | static void qnx4_read_inode(struct inode *); | |
129 | static int qnx4_remount(struct super_block *sb, int *flags, char *data); | |
726c3342 | 130 | static int qnx4_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
131 | |
132 | static 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 | ||
147 | static 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 | ||
165 | static 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 | ||
197 | struct 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 | ||
215 | static 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 | ||
231 | unsigned 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); | |
75043cb5 | 239 | u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts); |
1da177e4 LT |
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 | ||
726c3342 | 284 | static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 285 | { |
726c3342 DH |
286 | struct super_block *sb = dentry->d_sb; |
287 | ||
1da177e4 LT |
288 | lock_kernel(); |
289 | ||
290 | buf->f_type = sb->s_magic; | |
291 | buf->f_bsize = sb->s_blocksize; | |
292 | buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8; | |
293 | buf->f_bfree = qnx4_count_free_blocks(sb); | |
294 | buf->f_bavail = buf->f_bfree; | |
295 | buf->f_namelen = QNX4_NAME_MAX; | |
296 | ||
297 | unlock_kernel(); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | /* | |
303 | * Check the root directory of the filesystem to make sure | |
304 | * it really _is_ a qnx4 filesystem, and to check the size | |
305 | * of the directory entry. | |
306 | */ | |
307 | static const char *qnx4_checkroot(struct super_block *sb) | |
308 | { | |
309 | struct buffer_head *bh; | |
310 | struct qnx4_inode_entry *rootdir; | |
311 | int rd, rl; | |
312 | int i, j; | |
313 | int found = 0; | |
314 | ||
315 | if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') { | |
316 | return "no qnx4 filesystem (no root dir)."; | |
317 | } else { | |
318 | QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id)); | |
319 | rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1; | |
320 | rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size); | |
321 | for (j = 0; j < rl; j++) { | |
322 | bh = sb_bread(sb, rd + j); /* root dir, first block */ | |
323 | if (bh == NULL) { | |
324 | return "unable to read root entry."; | |
325 | } | |
326 | for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) { | |
327 | rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE); | |
328 | if (rootdir->di_fname != NULL) { | |
329 | QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname)); | |
330 | if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) { | |
331 | found = 1; | |
332 | qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL ); | |
333 | if (!qnx4_sb(sb)->BitMap) { | |
334 | brelse (bh); | |
335 | return "not enough memory for bitmap inode"; | |
336 | } | |
337 | memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */ | |
338 | break; | |
339 | } | |
340 | } | |
341 | } | |
342 | brelse(bh); | |
343 | if (found != 0) { | |
344 | break; | |
345 | } | |
346 | } | |
347 | if (found == 0) { | |
348 | return "bitmap file not found."; | |
349 | } | |
350 | } | |
351 | return NULL; | |
352 | } | |
353 | ||
354 | static int qnx4_fill_super(struct super_block *s, void *data, int silent) | |
355 | { | |
356 | struct buffer_head *bh; | |
357 | struct inode *root; | |
358 | const char *errmsg; | |
359 | struct qnx4_sb_info *qs; | |
360 | ||
f8314dc6 | 361 | qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL); |
1da177e4 LT |
362 | if (!qs) |
363 | return -ENOMEM; | |
364 | s->s_fs_info = qs; | |
1da177e4 LT |
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 | } | |
75043cb5 | 376 | if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) { |
1da177e4 LT |
377 | 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 | ||
423 | static 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 | ||
432 | static int qnx4_writepage(struct page *page, struct writeback_control *wbc) | |
433 | { | |
434 | return block_write_full_page(page,qnx4_get_block, wbc); | |
435 | } | |
436 | static int qnx4_readpage(struct file *file, struct page *page) | |
437 | { | |
438 | return block_read_full_page(page,qnx4_get_block); | |
439 | } | |
440 | static 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 | } | |
447 | static sector_t qnx4_bmap(struct address_space *mapping, sector_t block) | |
448 | { | |
449 | return generic_block_bmap(mapping,block,qnx4_get_block); | |
450 | } | |
f5e54d6e | 451 | static const struct address_space_operations qnx4_aops = { |
1da177e4 LT |
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 | ||
460 | static 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 | ||
519 | static kmem_cache_t *qnx4_inode_cachep; | |
520 | ||
521 | static 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 | ||
530 | static void qnx4_destroy_inode(struct inode *inode) | |
531 | { | |
532 | kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode)); | |
533 | } | |
534 | ||
535 | static 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 | ||
545 | static int init_inodecache(void) | |
546 | { | |
547 | qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache", | |
548 | sizeof(struct qnx4_inode_info), | |
fffb60f9 PJ |
549 | 0, (SLAB_RECLAIM_ACCOUNT| |
550 | SLAB_MEM_SPREAD), | |
1da177e4 LT |
551 | init_once, NULL); |
552 | if (qnx4_inode_cachep == NULL) | |
553 | return -ENOMEM; | |
554 | return 0; | |
555 | } | |
556 | ||
557 | static 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 | ||
454e2398 DH |
564 | static int qnx4_get_sb(struct file_system_type *fs_type, |
565 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 566 | { |
454e2398 DH |
567 | return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super, |
568 | mnt); | |
1da177e4 LT |
569 | } |
570 | ||
571 | static struct file_system_type qnx4_fs_type = { | |
572 | .owner = THIS_MODULE, | |
573 | .name = "qnx4", | |
574 | .get_sb = qnx4_get_sb, | |
575 | .kill_sb = kill_block_super, | |
576 | .fs_flags = FS_REQUIRES_DEV, | |
577 | }; | |
578 | ||
579 | static int __init init_qnx4_fs(void) | |
580 | { | |
581 | int err; | |
582 | ||
583 | err = init_inodecache(); | |
584 | if (err) | |
585 | return err; | |
586 | ||
587 | err = register_filesystem(&qnx4_fs_type); | |
588 | if (err) { | |
589 | destroy_inodecache(); | |
590 | return err; | |
591 | } | |
592 | ||
593 | printk("QNX4 filesystem 0.2.3 registered.\n"); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static void __exit exit_qnx4_fs(void) | |
598 | { | |
599 | unregister_filesystem(&qnx4_fs_type); | |
600 | destroy_inodecache(); | |
601 | } | |
602 | ||
603 | module_init(init_qnx4_fs) | |
604 | module_exit(exit_qnx4_fs) | |
605 | MODULE_LICENSE("GPL"); | |
606 |