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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 struct inode *qnx4_alloc_inode(struct super_block *sb);
31static void qnx4_destroy_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032static int qnx4_remount(struct super_block *sb, int *flags, char *data);
David Howells726c3342006-06-23 02:02:58 -070033static int qnx4_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080035static const struct super_operations qnx4_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
37 .alloc_inode = qnx4_alloc_inode,
38 .destroy_inode = qnx4_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 .statfs = qnx4_statfs,
40 .remount_fs = qnx4_remount,
Linus Torvalds1da177e2005-04-16 15:20:36 -070041};
42
43static int qnx4_remount(struct super_block *sb, int *flags, char *data)
44{
45 struct qnx4_sb_info *qs;
46
Theodore Ts'o02b99842014-03-13 10:14:33 -040047 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 qs = qnx4_sb(sb);
49 qs->Version = QNX4_VERSION;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 *flags |= MS_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 return 0;
52}
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
55{
56 unsigned long phys;
57
Anders Larsen891ddb92009-09-26 20:15:09 +020058 QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 phys = qnx4_block_map( inode, iblock );
61 if ( phys ) {
62 // logical block is before EOF
63 map_bh(bh, inode->i_sb, phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 }
65 return 0;
66}
67
Al Viro7cd916f2012-02-14 17:48:20 -050068static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset)
69{
70 u32 size = le32_to_cpu(extent->xtnt_size);
71 if (*offset < size)
72 return le32_to_cpu(extent->xtnt_blk) + *offset - 1;
73 *offset -= size;
74 return 0;
75}
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077unsigned long qnx4_block_map( struct inode *inode, long iblock )
78{
79 int ix;
Al Viro7cd916f2012-02-14 17:48:20 -050080 long i_xblk;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 struct buffer_head *bh = NULL;
82 struct qnx4_xblk *xblk = NULL;
83 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
Alexey Dobriyan75043cb2005-06-24 20:52:52 +000084 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
Al Viro7cd916f2012-02-14 17:48:20 -050085 u32 offset = iblock;
86 u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Al Viro7cd916f2012-02-14 17:48:20 -050088 if (block) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 // iblock is in the first extent. This is easy.
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 } else {
91 // iblock is beyond first extent. We have to follow the extent chain.
92 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 ix = 0;
94 while ( --nxtnt > 0 ) {
95 if ( ix == 0 ) {
96 // read next xtnt block.
97 bh = sb_bread(inode->i_sb, i_xblk - 1);
98 if ( !bh ) {
Anders Larsen891ddb92009-09-26 20:15:09 +020099 QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return -EIO;
101 }
102 xblk = (struct qnx4_xblk*)bh->b_data;
103 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200104 QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return -EIO;
106 }
107 }
Al Viro7cd916f2012-02-14 17:48:20 -0500108 block = try_extent(&xblk->xblk_xtnts[ix], &offset);
109 if (block) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 // got it!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 break;
112 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if ( ++ix >= xblk->xblk_num_xtnts ) {
114 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
115 ix = 0;
116 brelse( bh );
117 bh = NULL;
118 }
119 }
120 if ( bh )
121 brelse( bh );
122 }
123
Anders Larsen891ddb92009-09-26 20:15:09 +0200124 QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 return block;
126}
127
David Howells726c3342006-06-23 02:02:58 -0700128static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
David Howells726c3342006-06-23 02:02:58 -0700130 struct super_block *sb = dentry->d_sb;
Coly Li5b76dc02009-04-02 16:59:40 -0700131 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -0700132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 buf->f_type = sb->s_magic;
134 buf->f_bsize = sb->s_blocksize;
135 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
136 buf->f_bfree = qnx4_count_free_blocks(sb);
137 buf->f_bavail = buf->f_bfree;
138 buf->f_namelen = QNX4_NAME_MAX;
Coly Li5b76dc02009-04-02 16:59:40 -0700139 buf->f_fsid.val[0] = (u32)id;
140 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return 0;
143}
144
145/*
146 * Check the root directory of the filesystem to make sure
147 * it really _is_ a qnx4 filesystem, and to check the size
148 * of the directory entry.
149 */
Al Viro208adb62013-12-10 19:48:58 -0500150static const char *qnx4_checkroot(struct super_block *sb,
151 struct qnx4_super_block *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
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 Viro208adb62013-12-10 19:48:58 -0500158 if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0')
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));
Al Viro208adb62013-12-10 19:48:58 -0500161 rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1;
162 rl = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_size);
Al Viro4134bf82012-01-19 13:40:57 -0500163 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;
192
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700193 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
Arnd Bergmann073c2142010-10-21 15:53:15 +0200194 if (!qs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -ENOMEM;
196 s->s_fs_info = qs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
199
Al Viro208adb62013-12-10 19:48:58 -0500200 s->s_op = &qnx4_sops;
201 s->s_magic = QNX4_SUPER_MAGIC;
202 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 /* Check the superblock signature. Since the qnx4 code is
205 dangerous, we should leave as quickly as possible
206 if we don't belong here... */
207 bh = sb_bread(s, 1);
208 if (!bh) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200209 printk(KERN_ERR "qnx4: unable to read the superblock\n");
Al Viro208adb62013-12-10 19:48:58 -0500210 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 /* check before allocating dentries, inodes, .. */
Al Viro208adb62013-12-10 19:48:58 -0500214 errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
215 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (errmsg != NULL) {
217 if (!silent)
Anders Larsen891ddb92009-09-26 20:15:09 +0200218 printk(KERN_ERR "qnx4: %s\n", errmsg);
Al Viro208adb62013-12-10 19:48:58 -0500219 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 }
221
222 /* does root not have inode number QNX4_ROOT_INO ?? */
David Howells2b7e5bc2008-02-07 00:15:45 -0800223 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
224 if (IS_ERR(root)) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200225 printk(KERN_ERR "qnx4: get inode failed\n");
Al Viro208adb62013-12-10 19:48:58 -0500226 return PTR_ERR(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 }
228
Al Viro48fde702012-01-08 22:15:13 -0500229 s->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (s->s_root == NULL)
Al Viro208adb62013-12-10 19:48:58 -0500231 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
Al Viro208adb62013-12-10 19:48:58 -0500236static void qnx4_kill_sb(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
238 struct qnx4_sb_info *qs = qnx4_sb(sb);
Al Viro208adb62013-12-10 19:48:58 -0500239 kill_block_super(sb);
240 if (qs) {
241 kfree(qs->BitMap);
242 kfree(qs);
243 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246static int qnx4_readpage(struct file *file, struct page *page)
247{
248 return block_read_full_page(page,qnx4_get_block);
249}
Nick Pigginf8706182007-10-16 01:25:12 -0700250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
252{
253 return generic_block_bmap(mapping,block,qnx4_get_block);
254}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700255static const struct address_space_operations qnx4_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 .readpage = qnx4_readpage,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 .bmap = qnx4_bmap
258};
259
David Howells2b7e5bc2008-02-07 00:15:45 -0800260struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
262 struct buffer_head *bh;
263 struct qnx4_inode_entry *raw_inode;
David Howells2b7e5bc2008-02-07 00:15:45 -0800264 int block;
265 struct qnx4_inode_entry *qnx4_inode;
266 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
David Howells2b7e5bc2008-02-07 00:15:45 -0800268 inode = iget_locked(sb, ino);
269 if (!inode)
270 return ERR_PTR(-ENOMEM);
271 if (!(inode->i_state & I_NEW))
272 return inode;
273
274 qnx4_inode = qnx4_raw_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 inode->i_mode = 0;
276
Anders Larsen891ddb92009-09-26 20:15:09 +0200277 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 if (!ino) {
David Howells2b7e5bc2008-02-07 00:15:45 -0800279 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
280 "out of range\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 sb->s_id, ino);
David Howells2b7e5bc2008-02-07 00:15:45 -0800282 iget_failed(inode);
283 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
285 block = ino / QNX4_INODES_PER_BLOCK;
286
287 if (!(bh = sb_bread(sb, block))) {
Anders Larsen891ddb92009-09-26 20:15:09 +0200288 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 "%s\n", sb->s_id);
David Howells2b7e5bc2008-02-07 00:15:45 -0800290 iget_failed(inode);
291 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 }
293 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
294 (ino % QNX4_INODES_PER_BLOCK);
295
296 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
Eric W. Biederman511728d2012-02-10 12:11:12 -0800297 i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid));
298 i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid));
Miklos Szeredibfe86842011-10-28 14:13:29 +0200299 set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 inode->i_size = le32_to_cpu(raw_inode->di_size);
301 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
302 inode->i_mtime.tv_nsec = 0;
303 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
304 inode->i_atime.tv_nsec = 0;
305 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
306 inode->i_ctime.tv_nsec = 0;
307 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
310 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig945ffe52009-09-22 16:43:59 -0700311 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 inode->i_mapping->a_ops = &qnx4_aops;
313 qnx4_i(inode)->mmu_private = inode->i_size;
314 } else if (S_ISDIR(inode->i_mode)) {
315 inode->i_op = &qnx4_dir_inode_operations;
316 inode->i_fop = &qnx4_dir_operations;
317 } else if (S_ISLNK(inode->i_mode)) {
318 inode->i_op = &page_symlink_inode_operations;
319 inode->i_mapping->a_ops = &qnx4_aops;
320 qnx4_i(inode)->mmu_private = inode->i_size;
David Howells2b7e5bc2008-02-07 00:15:45 -0800321 } else {
322 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
323 ino, sb->s_id);
324 iget_failed(inode);
325 brelse(bh);
326 return ERR_PTR(-EIO);
327 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 brelse(bh);
David Howells2b7e5bc2008-02-07 00:15:45 -0800329 unlock_new_inode(inode);
330 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331}
332
Christoph Lametere18b8902006-12-06 20:33:20 -0800333static struct kmem_cache *qnx4_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335static struct inode *qnx4_alloc_inode(struct super_block *sb)
336{
337 struct qnx4_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800338 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 if (!ei)
340 return NULL;
341 return &ei->vfs_inode;
342}
343
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100344static void qnx4_i_callback(struct rcu_head *head)
345{
346 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100347 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
348}
349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350static void qnx4_destroy_inode(struct inode *inode)
351{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100352 call_rcu(&inode->i_rcu, qnx4_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353}
354
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700355static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
357 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
358
Christoph Lametera35afb82007-05-16 22:10:57 -0700359 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
361
362static int init_inodecache(void)
363{
364 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
365 sizeof(struct qnx4_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800366 0, (SLAB_RECLAIM_ACCOUNT|
367 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900368 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (qnx4_inode_cachep == NULL)
370 return -ENOMEM;
371 return 0;
372}
373
374static void destroy_inodecache(void)
375{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000376 /*
377 * Make sure all delayed rcu free inodes are flushed before we
378 * destroy cache.
379 */
380 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700381 kmem_cache_destroy(qnx4_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382}
383
Al Viro152a0832010-07-25 00:46:55 +0400384static struct dentry *qnx4_mount(struct file_system_type *fs_type,
385 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386{
Al Viro152a0832010-07-25 00:46:55 +0400387 return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}
389
390static struct file_system_type qnx4_fs_type = {
391 .owner = THIS_MODULE,
392 .name = "qnx4",
Al Viro152a0832010-07-25 00:46:55 +0400393 .mount = qnx4_mount,
Al Viro208adb62013-12-10 19:48:58 -0500394 .kill_sb = qnx4_kill_sb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 .fs_flags = FS_REQUIRES_DEV,
396};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800397MODULE_ALIAS_FS("qnx4");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399static int __init init_qnx4_fs(void)
400{
401 int err;
402
403 err = init_inodecache();
404 if (err)
405 return err;
406
407 err = register_filesystem(&qnx4_fs_type);
408 if (err) {
409 destroy_inodecache();
410 return err;
411 }
412
Anders Larsen891ddb92009-09-26 20:15:09 +0200413 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 return 0;
415}
416
417static void __exit exit_qnx4_fs(void)
418{
419 unregister_filesystem(&qnx4_fs_type);
420 destroy_inodecache();
421}
422
423module_init(init_qnx4_fs)
424module_exit(exit_qnx4_fs)
425MODULE_LICENSE("GPL");
426