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/types.h>
17 #include <linux/string.h>
18 #include <linux/errno.h>
19 #include <linux/slab.h>
21 #include <linux/qnx4_fs.h>
22 #include <linux/init.h>
23 #include <linux/highuid.h>
24 #include <linux/smp_lock.h>
25 #include <linux/pagemap.h>
26 #include <linux/buffer_head.h>
27 #include <linux/vfs.h>
28 #include <asm/uaccess.h>
30 #define QNX4_VERSION 4
31 #define QNX4_BMNAME ".bitmap"
33 static const struct super_operations qnx4_sops;
35 #ifdef CONFIG_QNX4FS_RW
37 int qnx4_sync_inode(struct inode *inode)
41 struct buffer_head *bh;
43 bh = qnx4_update_inode(inode);
44 if (bh && buffer_dirty(bh))
46 sync_dirty_buffer(bh);
47 if (buffer_req(bh) && !buffer_uptodate(bh))
49 printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
50 inode->i_sb->s_id, inode->i_ino);
62 static void qnx4_delete_inode(struct inode *inode)
64 QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
65 truncate_inode_pages(&inode->i_data, 0);
69 qnx4_free_inode(inode);
73 static int qnx4_write_inode(struct inode *inode, int unused)
75 struct qnx4_inode_entry *raw_inode;
77 struct buffer_head *bh;
80 QNX4DEBUG(("qnx4: write inode 1.\n"));
81 if (inode->i_nlink == 0) {
85 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
86 inode->i_sb->s_id, ino);
89 QNX4DEBUG(("qnx4: write inode 2.\n"));
90 block = ino / QNX4_INODES_PER_BLOCK;
92 if (!(bh = sb_bread(inode->i_sb, block))) {
93 printk("qnx4: major problem: unable to read inode from dev "
94 "%s\n", inode->i_sb->s_id);
98 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
99 (ino % QNX4_INODES_PER_BLOCK);
100 raw_inode->di_mode = cpu_to_le16(inode->i_mode);
101 raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
102 raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
103 raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
104 raw_inode->di_size = cpu_to_le32(inode->i_size);
105 raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
106 raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
107 raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
108 raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
109 mark_buffer_dirty(bh);
117 static void qnx4_put_super(struct super_block *sb);
118 static struct inode *qnx4_alloc_inode(struct super_block *sb);
119 static void qnx4_destroy_inode(struct inode *inode);
120 static int qnx4_remount(struct super_block *sb, int *flags, char *data);
121 static int qnx4_statfs(struct dentry *, struct kstatfs *);
123 static const struct super_operations qnx4_sops =
125 .alloc_inode = qnx4_alloc_inode,
126 .destroy_inode = qnx4_destroy_inode,
127 .put_super = qnx4_put_super,
128 .statfs = qnx4_statfs,
129 .remount_fs = qnx4_remount,
130 #ifdef CONFIG_QNX4FS_RW
131 .write_inode = qnx4_write_inode,
132 .delete_inode = qnx4_delete_inode,
136 static int qnx4_remount(struct super_block *sb, int *flags, char *data)
138 struct qnx4_sb_info *qs;
141 qs->Version = QNX4_VERSION;
142 #ifndef CONFIG_QNX4FS_RW
145 if (*flags & MS_RDONLY) {
149 mark_buffer_dirty(qs->sb_buf);
154 static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
157 struct buffer_head *result = NULL;
160 nr = qnx4_block_map( inode, nr );
162 result = sb_getblk(inode->i_sb, nr);
169 tmp = qnx4_new_block(inode->i_sb);
173 result = sb_getblk(inode->i_sb, tmp);
175 qnx4_free_block(inode->i_sb, tmp);
181 inode->i_ctime = CURRENT_TIME_SEC;
182 mark_inode_dirty(inode);
186 struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
188 struct buffer_head *bh;
190 bh = qnx4_getblk(inode, block, create);
191 if (!bh || buffer_uptodate(bh)) {
194 ll_rw_block(READ, 1, &bh);
196 if (buffer_uptodate(bh)) {
204 static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
208 QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
210 phys = qnx4_block_map( inode, iblock );
212 // logical block is before EOF
213 map_bh(bh, inode->i_sb, phys);
214 } else if ( create ) {
220 unsigned long qnx4_block_map( struct inode *inode, long iblock )
224 unsigned long block = 0;
225 struct buffer_head *bh = NULL;
226 struct qnx4_xblk *xblk = NULL;
227 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
228 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
230 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
231 // iblock is in the first extent. This is easy.
232 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
234 // iblock is beyond first extent. We have to follow the extent chain.
235 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
236 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
238 while ( --nxtnt > 0 ) {
240 // read next xtnt block.
241 bh = sb_bread(inode->i_sb, i_xblk - 1);
243 QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
246 xblk = (struct qnx4_xblk*)bh->b_data;
247 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
248 QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
252 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
254 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
257 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
258 if ( ++ix >= xblk->xblk_num_xtnts ) {
259 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
269 QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
273 static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
275 struct super_block *sb = dentry->d_sb;
276 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
280 buf->f_type = sb->s_magic;
281 buf->f_bsize = sb->s_blocksize;
282 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
283 buf->f_bfree = qnx4_count_free_blocks(sb);
284 buf->f_bavail = buf->f_bfree;
285 buf->f_namelen = QNX4_NAME_MAX;
286 buf->f_fsid.val[0] = (u32)id;
287 buf->f_fsid.val[1] = (u32)(id >> 32);
295 * Check the root directory of the filesystem to make sure
296 * it really _is_ a qnx4 filesystem, and to check the size
297 * of the directory entry.
299 static const char *qnx4_checkroot(struct super_block *sb)
301 struct buffer_head *bh;
302 struct qnx4_inode_entry *rootdir;
307 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
308 return "no qnx4 filesystem (no root dir).";
310 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
311 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
312 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
313 for (j = 0; j < rl; j++) {
314 bh = sb_bread(sb, rd + j); /* root dir, first block */
316 return "unable to read root entry.";
318 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
319 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
320 if (rootdir->di_fname != NULL) {
321 QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
322 if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
324 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
325 if (!qnx4_sb(sb)->BitMap) {
327 return "not enough memory for bitmap inode";
329 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
340 return "bitmap file not found.";
346 static int qnx4_fill_super(struct super_block *s, void *data, int silent)
348 struct buffer_head *bh;
351 struct qnx4_sb_info *qs;
354 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
359 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
361 /* Check the superblock signature. Since the qnx4 code is
362 dangerous, we should leave as quickly as possible
363 if we don't belong here... */
366 printk("qnx4: unable to read the superblock\n");
369 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
371 printk("qnx4: wrong fsid in superblock.\n");
374 s->s_op = &qnx4_sops;
375 s->s_magic = QNX4_SUPER_MAGIC;
376 #ifndef CONFIG_QNX4FS_RW
377 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
379 qnx4_sb(s)->sb_buf = bh;
380 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
383 /* check before allocating dentries, inodes, .. */
384 errmsg = qnx4_checkroot(s);
385 if (errmsg != NULL) {
387 printk("qnx4: %s\n", errmsg);
391 /* does root not have inode number QNX4_ROOT_INO ?? */
392 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
394 printk("qnx4: get inode failed\n");
400 s->s_root = d_alloc_root(root);
401 if (s->s_root == NULL)
418 static void qnx4_put_super(struct super_block *sb)
420 struct qnx4_sb_info *qs = qnx4_sb(sb);
423 sb->s_fs_info = NULL;
427 static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
429 return block_write_full_page(page,qnx4_get_block, wbc);
432 static int qnx4_readpage(struct file *file, struct page *page)
434 return block_read_full_page(page,qnx4_get_block);
437 static int qnx4_write_begin(struct file *file, struct address_space *mapping,
438 loff_t pos, unsigned len, unsigned flags,
439 struct page **pagep, void **fsdata)
441 struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
443 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
445 &qnx4_inode->mmu_private);
447 static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
449 return generic_block_bmap(mapping,block,qnx4_get_block);
451 static const struct address_space_operations qnx4_aops = {
452 .readpage = qnx4_readpage,
453 .writepage = qnx4_writepage,
454 .sync_page = block_sync_page,
455 .write_begin = qnx4_write_begin,
456 .write_end = generic_write_end,
460 struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
462 struct buffer_head *bh;
463 struct qnx4_inode_entry *raw_inode;
465 struct qnx4_inode_entry *qnx4_inode;
468 inode = iget_locked(sb, ino);
470 return ERR_PTR(-ENOMEM);
471 if (!(inode->i_state & I_NEW))
474 qnx4_inode = qnx4_raw_inode(inode);
477 QNX4DEBUG(("Reading inode : [%d]\n", ino));
479 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
483 return ERR_PTR(-EIO);
485 block = ino / QNX4_INODES_PER_BLOCK;
487 if (!(bh = sb_bread(sb, block))) {
488 printk("qnx4: major problem: unable to read inode from dev "
491 return ERR_PTR(-EIO);
493 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
494 (ino % QNX4_INODES_PER_BLOCK);
496 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
497 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
498 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
499 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
500 inode->i_size = le32_to_cpu(raw_inode->di_size);
501 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
502 inode->i_mtime.tv_nsec = 0;
503 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
504 inode->i_atime.tv_nsec = 0;
505 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
506 inode->i_ctime.tv_nsec = 0;
507 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
509 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
510 if (S_ISREG(inode->i_mode)) {
511 inode->i_op = &qnx4_file_inode_operations;
512 inode->i_fop = &qnx4_file_operations;
513 inode->i_mapping->a_ops = &qnx4_aops;
514 qnx4_i(inode)->mmu_private = inode->i_size;
515 } else if (S_ISDIR(inode->i_mode)) {
516 inode->i_op = &qnx4_dir_inode_operations;
517 inode->i_fop = &qnx4_dir_operations;
518 } else if (S_ISLNK(inode->i_mode)) {
519 inode->i_op = &page_symlink_inode_operations;
520 inode->i_mapping->a_ops = &qnx4_aops;
521 qnx4_i(inode)->mmu_private = inode->i_size;
523 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
527 return ERR_PTR(-EIO);
530 unlock_new_inode(inode);
534 static struct kmem_cache *qnx4_inode_cachep;
536 static struct inode *qnx4_alloc_inode(struct super_block *sb)
538 struct qnx4_inode_info *ei;
539 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
542 return &ei->vfs_inode;
545 static void qnx4_destroy_inode(struct inode *inode)
547 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
550 static void init_once(void *foo)
552 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
554 inode_init_once(&ei->vfs_inode);
557 static int init_inodecache(void)
559 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
560 sizeof(struct qnx4_inode_info),
561 0, (SLAB_RECLAIM_ACCOUNT|
564 if (qnx4_inode_cachep == NULL)
569 static void destroy_inodecache(void)
571 kmem_cache_destroy(qnx4_inode_cachep);
574 static int qnx4_get_sb(struct file_system_type *fs_type,
575 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
577 return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
581 static struct file_system_type qnx4_fs_type = {
582 .owner = THIS_MODULE,
584 .get_sb = qnx4_get_sb,
585 .kill_sb = kill_block_super,
586 .fs_flags = FS_REQUIRES_DEV,
589 static int __init init_qnx4_fs(void)
593 err = init_inodecache();
597 err = register_filesystem(&qnx4_fs_type);
599 destroy_inodecache();
603 printk("QNX4 filesystem 0.2.3 registered.\n");
607 static void __exit exit_qnx4_fs(void)
609 unregister_filesystem(&qnx4_fs_type);
610 destroy_inodecache();
613 module_init(init_qnx4_fs)
614 module_exit(exit_qnx4_fs)
615 MODULE_LICENSE("GPL");