2 * QNX4 file system, Linux implementation.
6 * Using parts of the xiafs filesystem.
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.
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/highuid.h>
19 #include <linux/smp_lock.h>
20 #include <linux/pagemap.h>
21 #include <linux/buffer_head.h>
22 #include <linux/writeback.h>
23 #include <linux/statfs.h>
26 #define QNX4_VERSION 4
27 #define QNX4_BMNAME ".bitmap"
29 static const struct super_operations qnx4_sops;
31 static void qnx4_put_super(struct super_block *sb);
32 static struct inode *qnx4_alloc_inode(struct super_block *sb);
33 static void qnx4_destroy_inode(struct inode *inode);
34 static int qnx4_remount(struct super_block *sb, int *flags, char *data);
35 static int qnx4_statfs(struct dentry *, struct kstatfs *);
37 static const struct super_operations qnx4_sops =
39 .alloc_inode = qnx4_alloc_inode,
40 .destroy_inode = qnx4_destroy_inode,
41 .put_super = qnx4_put_super,
42 .statfs = qnx4_statfs,
43 .remount_fs = qnx4_remount,
46 static int qnx4_remount(struct super_block *sb, int *flags, char *data)
48 struct qnx4_sb_info *qs;
51 qs->Version = QNX4_VERSION;
56 static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
59 struct buffer_head *result = NULL;
62 nr = qnx4_block_map( inode, nr );
64 result = sb_getblk(inode->i_sb, nr);
70 struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
72 struct buffer_head *bh;
74 bh = qnx4_getblk(inode, block, create);
75 if (!bh || buffer_uptodate(bh)) {
78 ll_rw_block(READ, 1, &bh);
80 if (buffer_uptodate(bh)) {
88 static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
92 QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
94 phys = qnx4_block_map( inode, iblock );
96 // logical block is before EOF
97 map_bh(bh, inode->i_sb, phys);
102 unsigned long qnx4_block_map( struct inode *inode, long iblock )
106 unsigned long block = 0;
107 struct buffer_head *bh = NULL;
108 struct qnx4_xblk *xblk = NULL;
109 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
110 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
112 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
113 // iblock is in the first extent. This is easy.
114 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
116 // iblock is beyond first extent. We have to follow the extent chain.
117 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
118 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
120 while ( --nxtnt > 0 ) {
122 // read next xtnt block.
123 bh = sb_bread(inode->i_sb, i_xblk - 1);
125 QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
128 xblk = (struct qnx4_xblk*)bh->b_data;
129 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
130 QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
134 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
136 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
139 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
140 if ( ++ix >= xblk->xblk_num_xtnts ) {
141 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
151 QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
155 static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
157 struct super_block *sb = dentry->d_sb;
158 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
162 buf->f_type = sb->s_magic;
163 buf->f_bsize = sb->s_blocksize;
164 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
165 buf->f_bfree = qnx4_count_free_blocks(sb);
166 buf->f_bavail = buf->f_bfree;
167 buf->f_namelen = QNX4_NAME_MAX;
168 buf->f_fsid.val[0] = (u32)id;
169 buf->f_fsid.val[1] = (u32)(id >> 32);
177 * Check the root directory of the filesystem to make sure
178 * it really _is_ a qnx4 filesystem, and to check the size
179 * of the directory entry.
181 static const char *qnx4_checkroot(struct super_block *sb)
183 struct buffer_head *bh;
184 struct qnx4_inode_entry *rootdir;
189 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
190 return "no qnx4 filesystem (no root dir).";
192 QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
193 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
194 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
195 for (j = 0; j < rl; j++) {
196 bh = sb_bread(sb, rd + j); /* root dir, first block */
198 return "unable to read root entry.";
200 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
201 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
202 if (rootdir->di_fname != NULL) {
203 QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
204 if (!strcmp(rootdir->di_fname,
207 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
208 if (!qnx4_sb(sb)->BitMap) {
210 return "not enough memory for bitmap inode";
212 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
223 return "bitmap file not found.";
229 static int qnx4_fill_super(struct super_block *s, void *data, int silent)
231 struct buffer_head *bh;
234 struct qnx4_sb_info *qs;
237 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
242 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
244 /* Check the superblock signature. Since the qnx4 code is
245 dangerous, we should leave as quickly as possible
246 if we don't belong here... */
249 printk(KERN_ERR "qnx4: unable to read the superblock\n");
252 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
254 printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
257 s->s_op = &qnx4_sops;
258 s->s_magic = QNX4_SUPER_MAGIC;
259 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
260 qnx4_sb(s)->sb_buf = bh;
261 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
264 /* check before allocating dentries, inodes, .. */
265 errmsg = qnx4_checkroot(s);
266 if (errmsg != NULL) {
268 printk(KERN_ERR "qnx4: %s\n", errmsg);
272 /* does root not have inode number QNX4_ROOT_INO ?? */
273 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
275 printk(KERN_ERR "qnx4: get inode failed\n");
281 s->s_root = d_alloc_root(root);
282 if (s->s_root == NULL)
299 static void qnx4_put_super(struct super_block *sb)
301 struct qnx4_sb_info *qs = qnx4_sb(sb);
304 sb->s_fs_info = NULL;
308 static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
310 return block_write_full_page(page,qnx4_get_block, wbc);
313 static int qnx4_readpage(struct file *file, struct page *page)
315 return block_read_full_page(page,qnx4_get_block);
318 static int qnx4_write_begin(struct file *file, struct address_space *mapping,
319 loff_t pos, unsigned len, unsigned flags,
320 struct page **pagep, void **fsdata)
322 struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
324 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
326 &qnx4_inode->mmu_private);
328 static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
330 return generic_block_bmap(mapping,block,qnx4_get_block);
332 static const struct address_space_operations qnx4_aops = {
333 .readpage = qnx4_readpage,
334 .writepage = qnx4_writepage,
335 .sync_page = block_sync_page,
336 .write_begin = qnx4_write_begin,
337 .write_end = generic_write_end,
341 struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
343 struct buffer_head *bh;
344 struct qnx4_inode_entry *raw_inode;
346 struct qnx4_inode_entry *qnx4_inode;
349 inode = iget_locked(sb, ino);
351 return ERR_PTR(-ENOMEM);
352 if (!(inode->i_state & I_NEW))
355 qnx4_inode = qnx4_raw_inode(inode);
358 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
360 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
364 return ERR_PTR(-EIO);
366 block = ino / QNX4_INODES_PER_BLOCK;
368 if (!(bh = sb_bread(sb, block))) {
369 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
372 return ERR_PTR(-EIO);
374 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
375 (ino % QNX4_INODES_PER_BLOCK);
377 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
378 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
379 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
380 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
381 inode->i_size = le32_to_cpu(raw_inode->di_size);
382 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
383 inode->i_mtime.tv_nsec = 0;
384 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
385 inode->i_atime.tv_nsec = 0;
386 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
387 inode->i_ctime.tv_nsec = 0;
388 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
390 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
391 if (S_ISREG(inode->i_mode)) {
392 inode->i_fop = &generic_ro_fops;
393 inode->i_mapping->a_ops = &qnx4_aops;
394 qnx4_i(inode)->mmu_private = inode->i_size;
395 } else if (S_ISDIR(inode->i_mode)) {
396 inode->i_op = &qnx4_dir_inode_operations;
397 inode->i_fop = &qnx4_dir_operations;
398 } else if (S_ISLNK(inode->i_mode)) {
399 inode->i_op = &page_symlink_inode_operations;
400 inode->i_mapping->a_ops = &qnx4_aops;
401 qnx4_i(inode)->mmu_private = inode->i_size;
403 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
407 return ERR_PTR(-EIO);
410 unlock_new_inode(inode);
414 static struct kmem_cache *qnx4_inode_cachep;
416 static struct inode *qnx4_alloc_inode(struct super_block *sb)
418 struct qnx4_inode_info *ei;
419 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
422 return &ei->vfs_inode;
425 static void qnx4_destroy_inode(struct inode *inode)
427 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
430 static void init_once(void *foo)
432 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
434 inode_init_once(&ei->vfs_inode);
437 static int init_inodecache(void)
439 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
440 sizeof(struct qnx4_inode_info),
441 0, (SLAB_RECLAIM_ACCOUNT|
444 if (qnx4_inode_cachep == NULL)
449 static void destroy_inodecache(void)
451 kmem_cache_destroy(qnx4_inode_cachep);
454 static int qnx4_get_sb(struct file_system_type *fs_type,
455 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
457 return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
461 static struct file_system_type qnx4_fs_type = {
462 .owner = THIS_MODULE,
464 .get_sb = qnx4_get_sb,
465 .kill_sb = kill_block_super,
466 .fs_flags = FS_REQUIRES_DEV,
469 static int __init init_qnx4_fs(void)
473 err = init_inodecache();
477 err = register_filesystem(&qnx4_fs_type);
479 destroy_inodecache();
483 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
487 static void __exit exit_qnx4_fs(void)
489 unregister_filesystem(&qnx4_fs_type);
490 destroy_inodecache();
493 module_init(init_qnx4_fs)
494 module_exit(exit_qnx4_fs)
495 MODULE_LICENSE("GPL");