blob: 43098bb5723af2890acaaa8d2f3a86a37fc7b811 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070055static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
56{
57 unsigned long phys;
58
Anders Larsen891ddb92009-09-26 20:15:09 +020059 QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 phys = qnx4_block_map( inode, iblock );
62 if ( phys ) {
63 // logical block is before EOF
64 map_bh(bh, inode->i_sb, phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 }
66 return 0;
67}
68
Al Viro7cd916f2012-02-14 17:48:20 -050069static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset)
70{
71 u32 size = le32_to_cpu(extent->xtnt_size);
72 if (*offset < size)
73 return le32_to_cpu(extent->xtnt_blk) + *offset - 1;
74 *offset -= size;
75 return 0;
76}
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078unsigned long qnx4_block_map( struct inode *inode, long iblock )
79{
80 int ix;
Al Viro7cd916f2012-02-14 17:48:20 -050081 long i_xblk;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 struct buffer_head *bh = NULL;
83 struct qnx4_xblk *xblk = NULL;
84 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
Alexey Dobriyan75043cb2005-06-24 20:52:52 +000085 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
Al Viro7cd916f2012-02-14 17:48:20 -050086 u32 offset = iblock;
87 u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Al Viro7cd916f2012-02-14 17:48:20 -050089 if (block) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 // iblock is in the first extent. This is easy.
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 } else {
92 // iblock is beyond first extent. We have to follow the extent chain.
93 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 ix = 0;
95 while ( --nxtnt > 0 ) {
96 if ( ix == 0 ) {
97 // read next xtnt block.
98 bh = sb_bread(inode->i_sb, i_xblk - 1);
99 if ( !bh ) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200100 QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 return -EIO;
102 }
103 xblk = (struct qnx4_xblk*)bh->b_data;
104 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200105 QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return -EIO;
107 }
108 }
Al Viro7cd916f2012-02-14 17:48:20 -0500109 block = try_extent(&xblk->xblk_xtnts[ix], &offset);
110 if (block) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 // got it!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 break;
113 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if ( ++ix >= xblk->xblk_num_xtnts ) {
115 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
116 ix = 0;
117 brelse( bh );
118 bh = NULL;
119 }
120 }
121 if ( bh )
122 brelse( bh );
123 }
124
Anders Larsen891ddb92009-09-26 20:15:09 +0200125 QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return block;
127}
128
David Howells726c3342006-06-23 02:02:58 -0700129static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
David Howells726c3342006-06-23 02:02:58 -0700131 struct super_block *sb = dentry->d_sb;
Coly Li5b76dc02009-04-02 16:59:40 -0700132 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -0700133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 buf->f_type = sb->s_magic;
135 buf->f_bsize = sb->s_blocksize;
136 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
137 buf->f_bfree = qnx4_count_free_blocks(sb);
138 buf->f_bavail = buf->f_bfree;
139 buf->f_namelen = QNX4_NAME_MAX;
Coly Li5b76dc02009-04-02 16:59:40 -0700140 buf->f_fsid.val[0] = (u32)id;
141 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 return 0;
144}
145
146/*
147 * Check the root directory of the filesystem to make sure
148 * it really _is_ a qnx4 filesystem, and to check the size
149 * of the directory entry.
150 */
151static const char *qnx4_checkroot(struct super_block *sb)
152{
153 struct buffer_head *bh;
154 struct qnx4_inode_entry *rootdir;
155 int rd, rl;
156 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Al Viro4134bf82012-01-19 13:40:57 -0500158 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 return "no qnx4 filesystem (no root dir).";
Al Viro4134bf82012-01-19 13:40:57 -0500160 QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
161 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
162 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
163 for (j = 0; j < rl; j++) {
164 bh = sb_bread(sb, rd + j); /* root dir, first block */
165 if (bh == NULL)
166 return "unable to read root entry.";
167 rootdir = (struct qnx4_inode_entry *) bh->b_data;
168 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
169 QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
170 if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
171 continue;
172 qnx4_sb(sb)->BitMap = kmemdup(rootdir,
173 sizeof(struct qnx4_inode_entry),
174 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 brelse(bh);
Al Viro4134bf82012-01-19 13:40:57 -0500176 if (!qnx4_sb(sb)->BitMap)
177 return "not enough memory for bitmap inode";
178 /* keep bitmap inode known */
179 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
Al Viro4134bf82012-01-19 13:40:57 -0500181 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 }
Al Viro4134bf82012-01-19 13:40:57 -0500183 return "bitmap file not found.";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
186static int qnx4_fill_super(struct super_block *s, void *data, int silent)
187{
188 struct buffer_head *bh;
189 struct inode *root;
190 const char *errmsg;
191 struct qnx4_sb_info *qs;
David Howells2b7e5bc2008-02-07 00:15:45 -0800192 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700194 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
Arnd Bergmann073c2142010-10-21 15:53:15 +0200195 if (!qs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 return -ENOMEM;
197 s->s_fs_info = qs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
200
201 /* Check the superblock signature. Since the qnx4 code is
202 dangerous, we should leave as quickly as possible
203 if we don't belong here... */
204 bh = sb_bread(s, 1);
205 if (!bh) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200206 printk(KERN_ERR "qnx4: unable to read the superblock\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 goto outnobh;
208 }
Alexey Dobriyan75043cb2005-06-24 20:52:52 +0000209 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 if (!silent)
Anders Larsen891ddb92009-09-26 20:15:09 +0200211 printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 goto out;
213 }
214 s->s_op = &qnx4_sops;
215 s->s_magic = QNX4_SUPER_MAGIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 qnx4_sb(s)->sb_buf = bh;
218 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
219
220
221 /* check before allocating dentries, inodes, .. */
222 errmsg = qnx4_checkroot(s);
223 if (errmsg != NULL) {
224 if (!silent)
Anders Larsen891ddb92009-09-26 20:15:09 +0200225 printk(KERN_ERR "qnx4: %s\n", errmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 goto out;
227 }
228
229 /* does root not have inode number QNX4_ROOT_INO ?? */
David Howells2b7e5bc2008-02-07 00:15:45 -0800230 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
231 if (IS_ERR(root)) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200232 printk(KERN_ERR "qnx4: get inode failed\n");
David Howells2b7e5bc2008-02-07 00:15:45 -0800233 ret = PTR_ERR(root);
Al Viro8bc51912012-01-19 13:54:36 -0500234 goto outb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 }
236
David Howells2b7e5bc2008-02-07 00:15:45 -0800237 ret = -ENOMEM;
Al Viro48fde702012-01-08 22:15:13 -0500238 s->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 if (s->s_root == NULL)
Al Viro48fde702012-01-08 22:15:13 -0500240 goto outb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return 0;
244
Al Viro8bc51912012-01-19 13:54:36 -0500245 outb:
246 kfree(qs->BitMap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 out:
248 brelse(bh);
249 outnobh:
250 kfree(qs);
251 s->s_fs_info = NULL;
David Howells2b7e5bc2008-02-07 00:15:45 -0800252 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255static void qnx4_put_super(struct super_block *sb)
256{
257 struct qnx4_sb_info *qs = qnx4_sb(sb);
258 kfree( qs->BitMap );
259 kfree( qs );
260 sb->s_fs_info = NULL;
261 return;
262}
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264static int qnx4_readpage(struct file *file, struct page *page)
265{
266 return block_read_full_page(page,qnx4_get_block);
267}
Nick Pigginf8706182007-10-16 01:25:12 -0700268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
270{
271 return generic_block_bmap(mapping,block,qnx4_get_block);
272}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700273static const struct address_space_operations qnx4_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 .readpage = qnx4_readpage,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 .bmap = qnx4_bmap
276};
277
David Howells2b7e5bc2008-02-07 00:15:45 -0800278struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
280 struct buffer_head *bh;
281 struct qnx4_inode_entry *raw_inode;
David Howells2b7e5bc2008-02-07 00:15:45 -0800282 int block;
283 struct qnx4_inode_entry *qnx4_inode;
284 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
David Howells2b7e5bc2008-02-07 00:15:45 -0800286 inode = iget_locked(sb, ino);
287 if (!inode)
288 return ERR_PTR(-ENOMEM);
289 if (!(inode->i_state & I_NEW))
290 return inode;
291
292 qnx4_inode = qnx4_raw_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 inode->i_mode = 0;
294
Anders Larsen891ddb92009-09-26 20:15:09 +0200295 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 if (!ino) {
David Howells2b7e5bc2008-02-07 00:15:45 -0800297 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
298 "out of range\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 sb->s_id, ino);
David Howells2b7e5bc2008-02-07 00:15:45 -0800300 iget_failed(inode);
301 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 }
303 block = ino / QNX4_INODES_PER_BLOCK;
304
305 if (!(bh = sb_bread(sb, block))) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200306 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 "%s\n", sb->s_id);
David Howells2b7e5bc2008-02-07 00:15:45 -0800308 iget_failed(inode);
309 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 }
311 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
312 (ino % QNX4_INODES_PER_BLOCK);
313
314 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
Eric W. Biederman511728d2012-02-10 12:11:12 -0800315 i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid));
316 i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid));
Miklos Szeredibfe86842011-10-28 14:13:29 +0200317 set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 inode->i_size = le32_to_cpu(raw_inode->di_size);
319 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
320 inode->i_mtime.tv_nsec = 0;
321 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
322 inode->i_atime.tv_nsec = 0;
323 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
324 inode->i_ctime.tv_nsec = 0;
325 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
328 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig945ffe52009-09-22 16:43:59 -0700329 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 inode->i_mapping->a_ops = &qnx4_aops;
331 qnx4_i(inode)->mmu_private = inode->i_size;
332 } else if (S_ISDIR(inode->i_mode)) {
333 inode->i_op = &qnx4_dir_inode_operations;
334 inode->i_fop = &qnx4_dir_operations;
335 } else if (S_ISLNK(inode->i_mode)) {
336 inode->i_op = &page_symlink_inode_operations;
337 inode->i_mapping->a_ops = &qnx4_aops;
338 qnx4_i(inode)->mmu_private = inode->i_size;
David Howells2b7e5bc2008-02-07 00:15:45 -0800339 } else {
340 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
341 ino, sb->s_id);
342 iget_failed(inode);
343 brelse(bh);
344 return ERR_PTR(-EIO);
345 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 brelse(bh);
David Howells2b7e5bc2008-02-07 00:15:45 -0800347 unlock_new_inode(inode);
348 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350
Christoph Lametere18b8902006-12-06 20:33:20 -0800351static struct kmem_cache *qnx4_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353static struct inode *qnx4_alloc_inode(struct super_block *sb)
354{
355 struct qnx4_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800356 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 if (!ei)
358 return NULL;
359 return &ei->vfs_inode;
360}
361
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100362static void qnx4_i_callback(struct rcu_head *head)
363{
364 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100365 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
366}
367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368static void qnx4_destroy_inode(struct inode *inode)
369{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100370 call_rcu(&inode->i_rcu, qnx4_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371}
372
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700373static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
375 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
376
Christoph Lametera35afb82007-05-16 22:10:57 -0700377 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
380static int init_inodecache(void)
381{
382 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
383 sizeof(struct qnx4_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800384 0, (SLAB_RECLAIM_ACCOUNT|
385 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900386 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 if (qnx4_inode_cachep == NULL)
388 return -ENOMEM;
389 return 0;
390}
391
392static void destroy_inodecache(void)
393{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000394 /*
395 * Make sure all delayed rcu free inodes are flushed before we
396 * destroy cache.
397 */
398 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700399 kmem_cache_destroy(qnx4_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Al Viro152a0832010-07-25 00:46:55 +0400402static struct dentry *qnx4_mount(struct file_system_type *fs_type,
403 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404{
Al Viro152a0832010-07-25 00:46:55 +0400405 return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406}
407
408static struct file_system_type qnx4_fs_type = {
409 .owner = THIS_MODULE,
410 .name = "qnx4",
Al Viro152a0832010-07-25 00:46:55 +0400411 .mount = qnx4_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 .kill_sb = kill_block_super,
413 .fs_flags = FS_REQUIRES_DEV,
414};
415
416static int __init init_qnx4_fs(void)
417{
418 int err;
419
420 err = init_inodecache();
421 if (err)
422 return err;
423
424 err = register_filesystem(&qnx4_fs_type);
425 if (err) {
426 destroy_inodecache();
427 return err;
428 }
429
Anders Larsen891ddb92009-09-26 20:15:09 +0200430 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return 0;
432}
433
434static void __exit exit_qnx4_fs(void)
435{
436 unregister_filesystem(&qnx4_fs_type);
437 destroy_inodecache();
438}
439
440module_init(init_qnx4_fs)
441module_exit(exit_qnx4_fs)
442MODULE_LICENSE("GPL");
443