blob: 6b009548d2e0380dbbbd8c061570f2805371bf4d [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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Al Viro4134bf82012-01-19 13:40:57 -0500183 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return "no qnx4 filesystem (no root dir).";
Al Viro4134bf82012-01-19 13:40:57 -0500185 QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
186 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
187 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
188 for (j = 0; j < rl; j++) {
189 bh = sb_bread(sb, rd + j); /* root dir, first block */
190 if (bh == NULL)
191 return "unable to read root entry.";
192 rootdir = (struct qnx4_inode_entry *) bh->b_data;
193 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
194 QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
195 if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
196 continue;
197 qnx4_sb(sb)->BitMap = kmemdup(rootdir,
198 sizeof(struct qnx4_inode_entry),
199 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 brelse(bh);
Al Viro4134bf82012-01-19 13:40:57 -0500201 if (!qnx4_sb(sb)->BitMap)
202 return "not enough memory for bitmap inode";
203 /* keep bitmap inode known */
204 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 }
Al Viro4134bf82012-01-19 13:40:57 -0500206 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 }
Al Viro4134bf82012-01-19 13:40:57 -0500208 return "bitmap file not found.";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209}
210
211static int qnx4_fill_super(struct super_block *s, void *data, int silent)
212{
213 struct buffer_head *bh;
214 struct inode *root;
215 const char *errmsg;
216 struct qnx4_sb_info *qs;
David Howells2b7e5bc2008-02-07 00:15:45 -0800217 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700219 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
Arnd Bergmann073c2142010-10-21 15:53:15 +0200220 if (!qs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return -ENOMEM;
222 s->s_fs_info = qs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
225
226 /* Check the superblock signature. Since the qnx4 code is
227 dangerous, we should leave as quickly as possible
228 if we don't belong here... */
229 bh = sb_bread(s, 1);
230 if (!bh) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200231 printk(KERN_ERR "qnx4: unable to read the superblock\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 goto outnobh;
233 }
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000234 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (!silent)
Anders Larsen891ddb92009-09-26 20:15:09 +0200236 printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 goto out;
238 }
239 s->s_op = &qnx4_sops;
240 s->s_magic = QNX4_SUPER_MAGIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 qnx4_sb(s)->sb_buf = bh;
243 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
244
245
246 /* check before allocating dentries, inodes, .. */
247 errmsg = qnx4_checkroot(s);
248 if (errmsg != NULL) {
249 if (!silent)
Anders Larsen891ddb92009-09-26 20:15:09 +0200250 printk(KERN_ERR "qnx4: %s\n", errmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 goto out;
252 }
253
254 /* does root not have inode number QNX4_ROOT_INO ?? */
David Howells2b7e5bc2008-02-07 00:15:45 -0800255 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
256 if (IS_ERR(root)) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200257 printk(KERN_ERR "qnx4: get inode failed\n");
David Howells2b7e5bc2008-02-07 00:15:45 -0800258 ret = PTR_ERR(root);
Al Viro8bc51912012-01-19 13:54:36 -0500259 goto outb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 }
261
David Howells2b7e5bc2008-02-07 00:15:45 -0800262 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 s->s_root = d_alloc_root(root);
264 if (s->s_root == NULL)
265 goto outi;
266
267 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return 0;
269
270 outi:
271 iput(root);
Al Viro8bc51912012-01-19 13:54:36 -0500272 outb:
273 kfree(qs->BitMap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 out:
275 brelse(bh);
276 outnobh:
277 kfree(qs);
278 s->s_fs_info = NULL;
David Howells2b7e5bc2008-02-07 00:15:45 -0800279 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
282static void qnx4_put_super(struct super_block *sb)
283{
284 struct qnx4_sb_info *qs = qnx4_sb(sb);
285 kfree( qs->BitMap );
286 kfree( qs );
287 sb->s_fs_info = NULL;
288 return;
289}
290
291static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
292{
293 return block_write_full_page(page,qnx4_get_block, wbc);
294}
Nick Pigginf8706182007-10-16 01:25:12 -0700295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296static int qnx4_readpage(struct file *file, struct page *page)
297{
298 return block_read_full_page(page,qnx4_get_block);
299}
Nick Pigginf8706182007-10-16 01:25:12 -0700300
301static int qnx4_write_begin(struct file *file, struct address_space *mapping,
302 loff_t pos, unsigned len, unsigned flags,
303 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
Nick Pigginf8706182007-10-16 01:25:12 -0700305 struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
Christoph Hellwig282dc172010-06-04 11:29:55 +0200306 int ret;
307
Nick Pigginf8706182007-10-16 01:25:12 -0700308 *pagep = NULL;
Christoph Hellwig282dc172010-06-04 11:29:55 +0200309 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
Nick Pigginf8706182007-10-16 01:25:12 -0700310 qnx4_get_block,
311 &qnx4_inode->mmu_private);
Christoph Hellwig282dc172010-06-04 11:29:55 +0200312 if (unlikely(ret)) {
313 loff_t isize = mapping->host->i_size;
314 if (pos + len > isize)
315 vmtruncate(mapping->host, isize);
316 }
317
318 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
320static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
321{
322 return generic_block_bmap(mapping,block,qnx4_get_block);
323}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700324static const struct address_space_operations qnx4_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 .readpage = qnx4_readpage,
326 .writepage = qnx4_writepage,
Nick Pigginf8706182007-10-16 01:25:12 -0700327 .write_begin = qnx4_write_begin,
328 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 .bmap = qnx4_bmap
330};
331
David Howells2b7e5bc2008-02-07 00:15:45 -0800332struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
334 struct buffer_head *bh;
335 struct qnx4_inode_entry *raw_inode;
David Howells2b7e5bc2008-02-07 00:15:45 -0800336 int block;
337 struct qnx4_inode_entry *qnx4_inode;
338 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
David Howells2b7e5bc2008-02-07 00:15:45 -0800340 inode = iget_locked(sb, ino);
341 if (!inode)
342 return ERR_PTR(-ENOMEM);
343 if (!(inode->i_state & I_NEW))
344 return inode;
345
346 qnx4_inode = qnx4_raw_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 inode->i_mode = 0;
348
Anders Larsen891ddb92009-09-26 20:15:09 +0200349 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 if (!ino) {
David Howells2b7e5bc2008-02-07 00:15:45 -0800351 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
352 "out of range\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 sb->s_id, ino);
David Howells2b7e5bc2008-02-07 00:15:45 -0800354 iget_failed(inode);
355 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
357 block = ino / QNX4_INODES_PER_BLOCK;
358
359 if (!(bh = sb_bread(sb, block))) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200360 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 "%s\n", sb->s_id);
David Howells2b7e5bc2008-02-07 00:15:45 -0800362 iget_failed(inode);
363 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
366 (ino % QNX4_INODES_PER_BLOCK);
367
368 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
369 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
370 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200371 set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 inode->i_size = le32_to_cpu(raw_inode->di_size);
373 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
374 inode->i_mtime.tv_nsec = 0;
375 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
376 inode->i_atime.tv_nsec = 0;
377 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
378 inode->i_ctime.tv_nsec = 0;
379 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
382 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig945ffe52009-09-22 16:43:59 -0700383 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 inode->i_mapping->a_ops = &qnx4_aops;
385 qnx4_i(inode)->mmu_private = inode->i_size;
386 } else if (S_ISDIR(inode->i_mode)) {
387 inode->i_op = &qnx4_dir_inode_operations;
388 inode->i_fop = &qnx4_dir_operations;
389 } else if (S_ISLNK(inode->i_mode)) {
390 inode->i_op = &page_symlink_inode_operations;
391 inode->i_mapping->a_ops = &qnx4_aops;
392 qnx4_i(inode)->mmu_private = inode->i_size;
David Howells2b7e5bc2008-02-07 00:15:45 -0800393 } else {
394 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
395 ino, sb->s_id);
396 iget_failed(inode);
397 brelse(bh);
398 return ERR_PTR(-EIO);
399 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 brelse(bh);
David Howells2b7e5bc2008-02-07 00:15:45 -0800401 unlock_new_inode(inode);
402 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403}
404
Christoph Lametere18b8902006-12-06 20:33:20 -0800405static struct kmem_cache *qnx4_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407static struct inode *qnx4_alloc_inode(struct super_block *sb)
408{
409 struct qnx4_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800410 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (!ei)
412 return NULL;
413 return &ei->vfs_inode;
414}
415
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100416static void qnx4_i_callback(struct rcu_head *head)
417{
418 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100419 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
420}
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422static void qnx4_destroy_inode(struct inode *inode)
423{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100424 call_rcu(&inode->i_rcu, qnx4_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
426
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700427static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
429 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
430
Christoph Lametera35afb82007-05-16 22:10:57 -0700431 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
434static int init_inodecache(void)
435{
436 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
437 sizeof(struct qnx4_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800438 0, (SLAB_RECLAIM_ACCOUNT|
439 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900440 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 if (qnx4_inode_cachep == NULL)
442 return -ENOMEM;
443 return 0;
444}
445
446static void destroy_inodecache(void)
447{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700448 kmem_cache_destroy(qnx4_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
450
Al Viro152a0832010-07-25 00:46:55 +0400451static struct dentry *qnx4_mount(struct file_system_type *fs_type,
452 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Al Viro152a0832010-07-25 00:46:55 +0400454 return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455}
456
457static struct file_system_type qnx4_fs_type = {
458 .owner = THIS_MODULE,
459 .name = "qnx4",
Al Viro152a0832010-07-25 00:46:55 +0400460 .mount = qnx4_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 .kill_sb = kill_block_super,
462 .fs_flags = FS_REQUIRES_DEV,
463};
464
465static int __init init_qnx4_fs(void)
466{
467 int err;
468
469 err = init_inodecache();
470 if (err)
471 return err;
472
473 err = register_filesystem(&qnx4_fs_type);
474 if (err) {
475 destroy_inodecache();
476 return err;
477 }
478
Anders Larsen891ddb92009-09-26 20:15:09 +0200479 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 return 0;
481}
482
483static void __exit exit_qnx4_fs(void)
484{
485 unregister_filesystem(&qnx4_fs_type);
486 destroy_inodecache();
487}
488
489module_init(init_qnx4_fs)
490module_exit(exit_qnx4_fs)
491MODULE_LICENSE("GPL");
492