blob: e63b4171d583bca9f5f32bc106eacac52ba89fde [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/pagemap.h>
20#include <linux/buffer_head.h>
Al Viro79d25762009-06-07 09:30:08 -040021#include <linux/writeback.h>
Al Viro964f5362009-06-07 09:47:13 -040022#include <linux/statfs.h>
23#include "qnx4.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#define QNX4_VERSION 4
26#define QNX4_BMNAME ".bitmap"
27
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080028static const struct super_operations qnx4_sops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Linus Torvalds1da177e2005-04-16 15:20:36 -070030static void qnx4_put_super(struct super_block *sb);
31static struct inode *qnx4_alloc_inode(struct super_block *sb);
32static void qnx4_destroy_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033static int qnx4_remount(struct super_block *sb, int *flags, char *data);
David Howells726c3342006-06-23 02:02:58 -070034static int qnx4_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080036static const struct super_operations qnx4_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
38 .alloc_inode = qnx4_alloc_inode,
39 .destroy_inode = qnx4_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 .put_super = qnx4_put_super,
41 .statfs = qnx4_statfs,
42 .remount_fs = qnx4_remount,
Linus Torvalds1da177e2005-04-16 15:20:36 -070043};
44
45static int qnx4_remount(struct super_block *sb, int *flags, char *data)
46{
47 struct qnx4_sb_info *qs;
48
49 qs = qnx4_sb(sb);
50 qs->Version = QNX4_VERSION;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 *flags |= MS_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return 0;
53}
54
55static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
56 int create)
57{
58 struct buffer_head *result = NULL;
59
60 if ( nr >= 0 )
61 nr = qnx4_block_map( inode, nr );
62 if (nr) {
63 result = sb_getblk(inode->i_sb, nr);
64 return result;
65 }
Anders Larsenca120b22009-12-15 16:48:23 -080066 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
69struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
70{
71 struct buffer_head *bh;
72
73 bh = qnx4_getblk(inode, block, create);
74 if (!bh || buffer_uptodate(bh)) {
75 return bh;
76 }
77 ll_rw_block(READ, 1, &bh);
78 wait_on_buffer(bh);
79 if (buffer_uptodate(bh)) {
80 return bh;
81 }
82 brelse(bh);
83
84 return NULL;
85}
86
87static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
88{
89 unsigned long phys;
90
Anders Larsen891ddb92009-09-26 20:15:09 +020091 QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 phys = qnx4_block_map( inode, iblock );
94 if ( phys ) {
95 // logical block is before EOF
96 map_bh(bh, inode->i_sb, phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
98 return 0;
99}
100
101unsigned long qnx4_block_map( struct inode *inode, long iblock )
102{
103 int ix;
104 long offset, i_xblk;
105 unsigned long block = 0;
106 struct buffer_head *bh = NULL;
107 struct qnx4_xblk *xblk = NULL;
108 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000109 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
112 // iblock is in the first extent. This is easy.
113 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
114 } else {
115 // iblock is beyond first extent. We have to follow the extent chain.
116 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
117 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
118 ix = 0;
119 while ( --nxtnt > 0 ) {
120 if ( ix == 0 ) {
121 // read next xtnt block.
122 bh = sb_bread(inode->i_sb, i_xblk - 1);
123 if ( !bh ) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200124 QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 return -EIO;
126 }
127 xblk = (struct qnx4_xblk*)bh->b_data;
128 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200129 QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 return -EIO;
131 }
132 }
133 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
134 // got it!
135 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
136 break;
137 }
138 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
139 if ( ++ix >= xblk->xblk_num_xtnts ) {
140 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
141 ix = 0;
142 brelse( bh );
143 bh = NULL;
144 }
145 }
146 if ( bh )
147 brelse( bh );
148 }
149
Anders Larsen891ddb92009-09-26 20:15:09 +0200150 QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 return block;
152}
153
David Howells726c3342006-06-23 02:02:58 -0700154static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
David Howells726c3342006-06-23 02:02:58 -0700156 struct super_block *sb = dentry->d_sb;
Coly Li5b76dc02009-04-02 16:59:40 -0700157 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -0700158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 buf->f_type = sb->s_magic;
160 buf->f_bsize = sb->s_blocksize;
161 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
162 buf->f_bfree = qnx4_count_free_blocks(sb);
163 buf->f_bavail = buf->f_bfree;
164 buf->f_namelen = QNX4_NAME_MAX;
Coly Li5b76dc02009-04-02 16:59:40 -0700165 buf->f_fsid.val[0] = (u32)id;
166 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return 0;
169}
170
171/*
172 * Check the root directory of the filesystem to make sure
173 * it really _is_ a qnx4 filesystem, and to check the size
174 * of the directory entry.
175 */
176static const char *qnx4_checkroot(struct super_block *sb)
177{
178 struct buffer_head *bh;
179 struct qnx4_inode_entry *rootdir;
180 int rd, rl;
181 int i, j;
182 int found = 0;
183
184 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
185 return "no qnx4 filesystem (no root dir).";
186 } else {
Anders Larsen891ddb92009-09-26 20:15:09 +0200187 QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
189 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
190 for (j = 0; j < rl; j++) {
191 bh = sb_bread(sb, rd + j); /* root dir, first block */
192 if (bh == NULL) {
193 return "unable to read root entry.";
194 }
195 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
196 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
197 if (rootdir->di_fname != NULL) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200198 QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
Julia Lawall7e2a1082009-11-12 23:08:36 +0100199 if (!strcmp(rootdir->di_fname,
200 QNX4_BMNAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 found = 1;
202 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
203 if (!qnx4_sb(sb)->BitMap) {
204 brelse (bh);
205 return "not enough memory for bitmap inode";
206 }
207 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
208 break;
209 }
210 }
211 }
212 brelse(bh);
213 if (found != 0) {
214 break;
215 }
216 }
217 if (found == 0) {
218 return "bitmap file not found.";
219 }
220 }
221 return NULL;
222}
223
224static int qnx4_fill_super(struct super_block *s, void *data, int silent)
225{
226 struct buffer_head *bh;
227 struct inode *root;
228 const char *errmsg;
229 struct qnx4_sb_info *qs;
David Howells2b7e5bc2008-02-07 00:15:45 -0800230 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700232 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
Arnd Bergmann073c2142010-10-21 15:53:15 +0200233 if (!qs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return -ENOMEM;
235 s->s_fs_info = qs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
238
239 /* Check the superblock signature. Since the qnx4 code is
240 dangerous, we should leave as quickly as possible
241 if we don't belong here... */
242 bh = sb_bread(s, 1);
243 if (!bh) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200244 printk(KERN_ERR "qnx4: unable to read the superblock\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 goto outnobh;
246 }
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000247 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 if (!silent)
Anders Larsen891ddb92009-09-26 20:15:09 +0200249 printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 goto out;
251 }
252 s->s_op = &qnx4_sops;
253 s->s_magic = QNX4_SUPER_MAGIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 qnx4_sb(s)->sb_buf = bh;
256 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
257
258
259 /* check before allocating dentries, inodes, .. */
260 errmsg = qnx4_checkroot(s);
261 if (errmsg != NULL) {
262 if (!silent)
Anders Larsen891ddb92009-09-26 20:15:09 +0200263 printk(KERN_ERR "qnx4: %s\n", errmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 goto out;
265 }
266
267 /* does root not have inode number QNX4_ROOT_INO ?? */
David Howells2b7e5bc2008-02-07 00:15:45 -0800268 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
269 if (IS_ERR(root)) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200270 printk(KERN_ERR "qnx4: get inode failed\n");
David Howells2b7e5bc2008-02-07 00:15:45 -0800271 ret = PTR_ERR(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 goto out;
273 }
274
David Howells2b7e5bc2008-02-07 00:15:45 -0800275 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 s->s_root = d_alloc_root(root);
277 if (s->s_root == NULL)
278 goto outi;
279
280 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 return 0;
282
283 outi:
284 iput(root);
285 out:
286 brelse(bh);
287 outnobh:
288 kfree(qs);
289 s->s_fs_info = NULL;
David Howells2b7e5bc2008-02-07 00:15:45 -0800290 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
293static void qnx4_put_super(struct super_block *sb)
294{
295 struct qnx4_sb_info *qs = qnx4_sb(sb);
296 kfree( qs->BitMap );
297 kfree( qs );
298 sb->s_fs_info = NULL;
299 return;
300}
301
302static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
303{
304 return block_write_full_page(page,qnx4_get_block, wbc);
305}
Nick Pigginf8706182007-10-16 01:25:12 -0700306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307static int qnx4_readpage(struct file *file, struct page *page)
308{
309 return block_read_full_page(page,qnx4_get_block);
310}
Nick Pigginf8706182007-10-16 01:25:12 -0700311
312static int qnx4_write_begin(struct file *file, struct address_space *mapping,
313 loff_t pos, unsigned len, unsigned flags,
314 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
Nick Pigginf8706182007-10-16 01:25:12 -0700316 struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
Christoph Hellwig282dc172010-06-04 11:29:55 +0200317 int ret;
318
Nick Pigginf8706182007-10-16 01:25:12 -0700319 *pagep = NULL;
Christoph Hellwig282dc172010-06-04 11:29:55 +0200320 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
Nick Pigginf8706182007-10-16 01:25:12 -0700321 qnx4_get_block,
322 &qnx4_inode->mmu_private);
Christoph Hellwig282dc172010-06-04 11:29:55 +0200323 if (unlikely(ret)) {
324 loff_t isize = mapping->host->i_size;
325 if (pos + len > isize)
326 vmtruncate(mapping->host, isize);
327 }
328
329 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
332{
333 return generic_block_bmap(mapping,block,qnx4_get_block);
334}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700335static const struct address_space_operations qnx4_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 .readpage = qnx4_readpage,
337 .writepage = qnx4_writepage,
338 .sync_page = block_sync_page,
Nick Pigginf8706182007-10-16 01:25:12 -0700339 .write_begin = qnx4_write_begin,
340 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 .bmap = qnx4_bmap
342};
343
David Howells2b7e5bc2008-02-07 00:15:45 -0800344struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
346 struct buffer_head *bh;
347 struct qnx4_inode_entry *raw_inode;
David Howells2b7e5bc2008-02-07 00:15:45 -0800348 int block;
349 struct qnx4_inode_entry *qnx4_inode;
350 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
David Howells2b7e5bc2008-02-07 00:15:45 -0800352 inode = iget_locked(sb, ino);
353 if (!inode)
354 return ERR_PTR(-ENOMEM);
355 if (!(inode->i_state & I_NEW))
356 return inode;
357
358 qnx4_inode = qnx4_raw_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 inode->i_mode = 0;
360
Anders Larsen891ddb92009-09-26 20:15:09 +0200361 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (!ino) {
David Howells2b7e5bc2008-02-07 00:15:45 -0800363 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
364 "out of range\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 sb->s_id, ino);
David Howells2b7e5bc2008-02-07 00:15:45 -0800366 iget_failed(inode);
367 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
369 block = ino / QNX4_INODES_PER_BLOCK;
370
371 if (!(bh = sb_bread(sb, block))) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200372 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 "%s\n", sb->s_id);
David Howells2b7e5bc2008-02-07 00:15:45 -0800374 iget_failed(inode);
375 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 }
377 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
378 (ino % QNX4_INODES_PER_BLOCK);
379
380 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
381 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
382 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
383 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
384 inode->i_size = le32_to_cpu(raw_inode->di_size);
385 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
386 inode->i_mtime.tv_nsec = 0;
387 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
388 inode->i_atime.tv_nsec = 0;
389 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
390 inode->i_ctime.tv_nsec = 0;
391 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
394 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig945ffe52009-09-22 16:43:59 -0700395 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 inode->i_mapping->a_ops = &qnx4_aops;
397 qnx4_i(inode)->mmu_private = inode->i_size;
398 } else if (S_ISDIR(inode->i_mode)) {
399 inode->i_op = &qnx4_dir_inode_operations;
400 inode->i_fop = &qnx4_dir_operations;
401 } else if (S_ISLNK(inode->i_mode)) {
402 inode->i_op = &page_symlink_inode_operations;
403 inode->i_mapping->a_ops = &qnx4_aops;
404 qnx4_i(inode)->mmu_private = inode->i_size;
David Howells2b7e5bc2008-02-07 00:15:45 -0800405 } else {
406 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
407 ino, sb->s_id);
408 iget_failed(inode);
409 brelse(bh);
410 return ERR_PTR(-EIO);
411 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 brelse(bh);
David Howells2b7e5bc2008-02-07 00:15:45 -0800413 unlock_new_inode(inode);
414 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415}
416
Christoph Lametere18b8902006-12-06 20:33:20 -0800417static struct kmem_cache *qnx4_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419static struct inode *qnx4_alloc_inode(struct super_block *sb)
420{
421 struct qnx4_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800422 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (!ei)
424 return NULL;
425 return &ei->vfs_inode;
426}
427
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100428static void qnx4_i_callback(struct rcu_head *head)
429{
430 struct inode *inode = container_of(head, struct inode, i_rcu);
431 INIT_LIST_HEAD(&inode->i_dentry);
432 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
433}
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435static void qnx4_destroy_inode(struct inode *inode)
436{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100437 call_rcu(&inode->i_rcu, qnx4_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
439
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700440static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
442 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
443
Christoph Lametera35afb82007-05-16 22:10:57 -0700444 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
447static int init_inodecache(void)
448{
449 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
450 sizeof(struct qnx4_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800451 0, (SLAB_RECLAIM_ACCOUNT|
452 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900453 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (qnx4_inode_cachep == NULL)
455 return -ENOMEM;
456 return 0;
457}
458
459static void destroy_inodecache(void)
460{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700461 kmem_cache_destroy(qnx4_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462}
463
Al Viro152a0832010-07-25 00:46:55 +0400464static struct dentry *qnx4_mount(struct file_system_type *fs_type,
465 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466{
Al Viro152a0832010-07-25 00:46:55 +0400467 return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468}
469
470static struct file_system_type qnx4_fs_type = {
471 .owner = THIS_MODULE,
472 .name = "qnx4",
Al Viro152a0832010-07-25 00:46:55 +0400473 .mount = qnx4_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 .kill_sb = kill_block_super,
475 .fs_flags = FS_REQUIRES_DEV,
476};
477
478static int __init init_qnx4_fs(void)
479{
480 int err;
481
482 err = init_inodecache();
483 if (err)
484 return err;
485
486 err = register_filesystem(&qnx4_fs_type);
487 if (err) {
488 destroy_inodecache();
489 return err;
490 }
491
Anders Larsen891ddb92009-09-26 20:15:09 +0200492 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 return 0;
494}
495
496static void __exit exit_qnx4_fs(void)
497{
498 unregister_filesystem(&qnx4_fs_type);
499 destroy_inodecache();
500}
501
502module_init(init_qnx4_fs)
503module_exit(exit_qnx4_fs)
504MODULE_LICENSE("GPL");
505