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/pagemap.h>
20 #include <linux/buffer_head.h>
21 #include <linux/writeback.h>
22 #include <linux/statfs.h>
25 #define QNX4_VERSION 4
26 #define QNX4_BMNAME ".bitmap"
28 static const struct super_operations qnx4_sops;
30 static struct inode *qnx4_alloc_inode(struct super_block *sb);
31 static void qnx4_destroy_inode(struct inode *inode);
32 static int qnx4_remount(struct super_block *sb, int *flags, char *data);
33 static int qnx4_statfs(struct dentry *, struct kstatfs *);
35 static const struct super_operations qnx4_sops =
37 .alloc_inode = qnx4_alloc_inode,
38 .destroy_inode = qnx4_destroy_inode,
39 .statfs = qnx4_statfs,
40 .remount_fs = qnx4_remount,
43 static int qnx4_remount(struct super_block *sb, int *flags, char *data)
45 struct qnx4_sb_info *qs;
49 qs->Version = QNX4_VERSION;
54 static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
58 QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
60 phys = qnx4_block_map( inode, iblock );
62 // logical block is before EOF
63 map_bh(bh, inode->i_sb, phys);
68 static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset)
70 u32 size = le32_to_cpu(extent->xtnt_size);
72 return le32_to_cpu(extent->xtnt_blk) + *offset - 1;
77 unsigned long qnx4_block_map( struct inode *inode, long iblock )
81 struct buffer_head *bh = NULL;
82 struct qnx4_xblk *xblk = NULL;
83 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
84 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
86 u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);
89 // iblock is in the first extent. This is easy.
91 // iblock is beyond first extent. We have to follow the extent chain.
92 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
94 while ( --nxtnt > 0 ) {
96 // read next xtnt block.
97 bh = sb_bread(inode->i_sb, i_xblk - 1);
99 QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
102 xblk = (struct qnx4_xblk*)bh->b_data;
103 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
104 QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
108 block = try_extent(&xblk->xblk_xtnts[ix], &offset);
113 if ( ++ix >= xblk->xblk_num_xtnts ) {
114 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
124 QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
128 static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
130 struct super_block *sb = dentry->d_sb;
131 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
133 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;
139 buf->f_fsid.val[0] = (u32)id;
140 buf->f_fsid.val[1] = (u32)(id >> 32);
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.
150 static const char *qnx4_checkroot(struct super_block *sb,
151 struct qnx4_super_block *s)
153 struct buffer_head *bh;
154 struct qnx4_inode_entry *rootdir;
158 if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0')
159 return "no qnx4 filesystem (no root dir).";
160 QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
161 rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1;
162 rl = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_size);
163 for (j = 0; j < rl; j++) {
164 bh = sb_bread(sb, rd + j); /* root dir, first block */
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)
172 qnx4_sb(sb)->BitMap = kmemdup(rootdir,
173 sizeof(struct qnx4_inode_entry),
176 if (!qnx4_sb(sb)->BitMap)
177 return "not enough memory for bitmap inode";
178 /* keep bitmap inode known */
183 return "bitmap file not found.";
186 static int qnx4_fill_super(struct super_block *s, void *data, int silent)
188 struct buffer_head *bh;
191 struct qnx4_sb_info *qs;
193 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
198 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
200 s->s_op = &qnx4_sops;
201 s->s_magic = QNX4_SUPER_MAGIC;
202 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
204 /* 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... */
209 printk(KERN_ERR "qnx4: unable to read the superblock\n");
213 /* check before allocating dentries, inodes, .. */
214 errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
216 if (errmsg != NULL) {
218 printk(KERN_ERR "qnx4: %s\n", errmsg);
222 /* does root not have inode number QNX4_ROOT_INO ?? */
223 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
225 printk(KERN_ERR "qnx4: get inode failed\n");
226 return PTR_ERR(root);
229 s->s_root = d_make_root(root);
230 if (s->s_root == NULL)
236 static void qnx4_kill_sb(struct super_block *sb)
238 struct qnx4_sb_info *qs = qnx4_sb(sb);
239 kill_block_super(sb);
246 static int qnx4_readpage(struct file *file, struct page *page)
248 return block_read_full_page(page,qnx4_get_block);
251 static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
253 return generic_block_bmap(mapping,block,qnx4_get_block);
255 static const struct address_space_operations qnx4_aops = {
256 .readpage = qnx4_readpage,
260 struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
262 struct buffer_head *bh;
263 struct qnx4_inode_entry *raw_inode;
265 struct qnx4_inode_entry *qnx4_inode;
268 inode = iget_locked(sb, ino);
270 return ERR_PTR(-ENOMEM);
271 if (!(inode->i_state & I_NEW))
274 qnx4_inode = qnx4_raw_inode(inode);
277 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
279 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
283 return ERR_PTR(-EIO);
285 block = ino / QNX4_INODES_PER_BLOCK;
287 if (!(bh = sb_bread(sb, block))) {
288 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
291 return ERR_PTR(-EIO);
293 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
294 (ino % QNX4_INODES_PER_BLOCK);
296 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
297 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));
299 set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
300 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);
309 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
310 if (S_ISREG(inode->i_mode)) {
311 inode->i_fop = &generic_ro_fops;
312 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;
322 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
326 return ERR_PTR(-EIO);
329 unlock_new_inode(inode);
333 static struct kmem_cache *qnx4_inode_cachep;
335 static struct inode *qnx4_alloc_inode(struct super_block *sb)
337 struct qnx4_inode_info *ei;
338 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
341 return &ei->vfs_inode;
344 static void qnx4_i_callback(struct rcu_head *head)
346 struct inode *inode = container_of(head, struct inode, i_rcu);
347 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
350 static void qnx4_destroy_inode(struct inode *inode)
352 call_rcu(&inode->i_rcu, qnx4_i_callback);
355 static void init_once(void *foo)
357 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
359 inode_init_once(&ei->vfs_inode);
362 static int init_inodecache(void)
364 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
365 sizeof(struct qnx4_inode_info),
366 0, (SLAB_RECLAIM_ACCOUNT|
369 if (qnx4_inode_cachep == NULL)
374 static void destroy_inodecache(void)
377 * Make sure all delayed rcu free inodes are flushed before we
381 kmem_cache_destroy(qnx4_inode_cachep);
384 static struct dentry *qnx4_mount(struct file_system_type *fs_type,
385 int flags, const char *dev_name, void *data)
387 return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
390 static struct file_system_type qnx4_fs_type = {
391 .owner = THIS_MODULE,
394 .kill_sb = qnx4_kill_sb,
395 .fs_flags = FS_REQUIRES_DEV,
397 MODULE_ALIAS_FS("qnx4");
399 static int __init init_qnx4_fs(void)
403 err = init_inodecache();
407 err = register_filesystem(&qnx4_fs_type);
409 destroy_inodecache();
413 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
417 static void __exit exit_qnx4_fs(void)
419 unregister_filesystem(&qnx4_fs_type);
420 destroy_inodecache();
423 module_init(init_qnx4_fs)
424 module_exit(exit_qnx4_fs)
425 MODULE_LICENSE("GPL");