1
2
3
4
5
6
7
8
9
10
11
12
13
14
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>
23#include "qnx4.h"
24
25#define QNX4_VERSION 4
26#define QNX4_BMNAME ".bitmap"
27
28static const struct super_operations qnx4_sops;
29
30static struct inode *qnx4_alloc_inode(struct super_block *sb);
31static void qnx4_destroy_inode(struct inode *inode);
32static int qnx4_remount(struct super_block *sb, int *flags, char *data);
33static int qnx4_statfs(struct dentry *, struct kstatfs *);
34
35static const struct super_operations qnx4_sops =
36{
37 .alloc_inode = qnx4_alloc_inode,
38 .destroy_inode = qnx4_destroy_inode,
39 .statfs = qnx4_statfs,
40 .remount_fs = qnx4_remount,
41};
42
43static int qnx4_remount(struct super_block *sb, int *flags, char *data)
44{
45 struct qnx4_sb_info *qs;
46
47 sync_filesystem(sb);
48 qs = qnx4_sb(sb);
49 qs->Version = QNX4_VERSION;
50 *flags |= SB_RDONLY;
51 return 0;
52}
53
54static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
55{
56 unsigned long phys;
57
58 QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
59
60 phys = qnx4_block_map( inode, iblock );
61 if ( phys ) {
62
63 map_bh(bh, inode->i_sb, phys);
64 }
65 return 0;
66}
67
68static 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
77unsigned long qnx4_block_map( struct inode *inode, long iblock )
78{
79 int ix;
80 long i_xblk;
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);
85 u32 offset = iblock;
86 u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);
87
88 if (block) {
89
90 } else {
91
92 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
93 ix = 0;
94 while ( --nxtnt > 0 ) {
95 if ( ix == 0 ) {
96
97 bh = sb_bread(inode->i_sb, i_xblk - 1);
98 if ( !bh ) {
99 QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
100 return -EIO;
101 }
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));
105 return -EIO;
106 }
107 }
108 block = try_extent(&xblk->xblk_xtnts[ix], &offset);
109 if (block) {
110
111 break;
112 }
113 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
124 QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
125 return block;
126}
127
128static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
129{
130 struct super_block *sb = dentry->d_sb;
131 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
132
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);
141
142 return 0;
143}
144
145
146
147
148
149
150static const char *qnx4_checkroot(struct super_block *sb,
151 struct qnx4_super_block *s)
152{
153 struct buffer_head *bh;
154 struct qnx4_inode_entry *rootdir;
155 int rd, rl;
156 int i, j;
157
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);
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);
175 brelse(bh);
176 if (!qnx4_sb(sb)->BitMap)
177 return "not enough memory for bitmap inode";
178
179 return NULL;
180 }
181 brelse(bh);
182 }
183 return "bitmap file not found.";
184}
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
193 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
194 if (!qs)
195 return -ENOMEM;
196 s->s_fs_info = qs;
197
198 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
199
200 s->s_op = &qnx4_sops;
201 s->s_magic = QNX4_SUPER_MAGIC;
202 s->s_flags |= SB_RDONLY;
203 s->s_time_min = 0;
204 s->s_time_max = U32_MAX;
205
206
207
208
209 bh = sb_bread(s, 1);
210 if (!bh) {
211 printk(KERN_ERR "qnx4: unable to read the superblock\n");
212 return -EINVAL;
213 }
214
215
216 errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
217 brelse(bh);
218 if (errmsg != NULL) {
219 if (!silent)
220 printk(KERN_ERR "qnx4: %s\n", errmsg);
221 return -EINVAL;
222 }
223
224
225 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
226 if (IS_ERR(root)) {
227 printk(KERN_ERR "qnx4: get inode failed\n");
228 return PTR_ERR(root);
229 }
230
231 s->s_root = d_make_root(root);
232 if (s->s_root == NULL)
233 return -ENOMEM;
234
235 return 0;
236}
237
238static void qnx4_kill_sb(struct super_block *sb)
239{
240 struct qnx4_sb_info *qs = qnx4_sb(sb);
241 kill_block_super(sb);
242 if (qs) {
243 kfree(qs->BitMap);
244 kfree(qs);
245 }
246}
247
248static int qnx4_readpage(struct file *file, struct page *page)
249{
250 return block_read_full_page(page,qnx4_get_block);
251}
252
253static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
254{
255 return generic_block_bmap(mapping,block,qnx4_get_block);
256}
257static const struct address_space_operations qnx4_aops = {
258 .readpage = qnx4_readpage,
259 .bmap = qnx4_bmap
260};
261
262struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
263{
264 struct buffer_head *bh;
265 struct qnx4_inode_entry *raw_inode;
266 int block;
267 struct qnx4_inode_entry *qnx4_inode;
268 struct inode *inode;
269
270 inode = iget_locked(sb, ino);
271 if (!inode)
272 return ERR_PTR(-ENOMEM);
273 if (!(inode->i_state & I_NEW))
274 return inode;
275
276 qnx4_inode = qnx4_raw_inode(inode);
277 inode->i_mode = 0;
278
279 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
280 if (!ino) {
281 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
282 "out of range\n",
283 sb->s_id, ino);
284 iget_failed(inode);
285 return ERR_PTR(-EIO);
286 }
287 block = ino / QNX4_INODES_PER_BLOCK;
288
289 if (!(bh = sb_bread(sb, block))) {
290 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
291 "%s\n", sb->s_id);
292 iget_failed(inode);
293 return ERR_PTR(-EIO);
294 }
295 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
296 (ino % QNX4_INODES_PER_BLOCK);
297
298 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
299 i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid));
300 i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid));
301 set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
302 inode->i_size = le32_to_cpu(raw_inode->di_size);
303 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
304 inode->i_mtime.tv_nsec = 0;
305 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
306 inode->i_atime.tv_nsec = 0;
307 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
308 inode->i_ctime.tv_nsec = 0;
309 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
310
311 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
312 if (S_ISREG(inode->i_mode)) {
313 inode->i_fop = &generic_ro_fops;
314 inode->i_mapping->a_ops = &qnx4_aops;
315 qnx4_i(inode)->mmu_private = inode->i_size;
316 } else if (S_ISDIR(inode->i_mode)) {
317 inode->i_op = &qnx4_dir_inode_operations;
318 inode->i_fop = &qnx4_dir_operations;
319 } else if (S_ISLNK(inode->i_mode)) {
320 inode->i_op = &page_symlink_inode_operations;
321 inode_nohighmem(inode);
322 inode->i_mapping->a_ops = &qnx4_aops;
323 qnx4_i(inode)->mmu_private = inode->i_size;
324 } else {
325 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
326 ino, sb->s_id);
327 iget_failed(inode);
328 brelse(bh);
329 return ERR_PTR(-EIO);
330 }
331 brelse(bh);
332 unlock_new_inode(inode);
333 return inode;
334}
335
336static struct kmem_cache *qnx4_inode_cachep;
337
338static struct inode *qnx4_alloc_inode(struct super_block *sb)
339{
340 struct qnx4_inode_info *ei;
341 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
342 if (!ei)
343 return NULL;
344 return &ei->vfs_inode;
345}
346
347static void qnx4_i_callback(struct rcu_head *head)
348{
349 struct inode *inode = container_of(head, struct inode, i_rcu);
350 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
351}
352
353static void qnx4_destroy_inode(struct inode *inode)
354{
355 call_rcu(&inode->i_rcu, qnx4_i_callback);
356}
357
358static void init_once(void *foo)
359{
360 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
361
362 inode_init_once(&ei->vfs_inode);
363}
364
365static int init_inodecache(void)
366{
367 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
368 sizeof(struct qnx4_inode_info),
369 0, (SLAB_RECLAIM_ACCOUNT|
370 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
371 init_once);
372 if (qnx4_inode_cachep == NULL)
373 return -ENOMEM;
374 return 0;
375}
376
377static void destroy_inodecache(void)
378{
379
380
381
382
383 rcu_barrier();
384 kmem_cache_destroy(qnx4_inode_cachep);
385}
386
387static struct dentry *qnx4_mount(struct file_system_type *fs_type,
388 int flags, const char *dev_name, void *data)
389{
390 return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
391}
392
393static struct file_system_type qnx4_fs_type = {
394 .owner = THIS_MODULE,
395 .name = "qnx4",
396 .mount = qnx4_mount,
397 .kill_sb = qnx4_kill_sb,
398 .fs_flags = FS_REQUIRES_DEV,
399};
400MODULE_ALIAS_FS("qnx4");
401
402static int __init init_qnx4_fs(void)
403{
404 int err;
405
406 err = init_inodecache();
407 if (err)
408 return err;
409
410 err = register_filesystem(&qnx4_fs_type);
411 if (err) {
412 destroy_inodecache();
413 return err;
414 }
415
416 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
417 return 0;
418}
419
420static void __exit exit_qnx4_fs(void)
421{
422 unregister_filesystem(&qnx4_fs_type);
423 destroy_inodecache();
424}
425
426module_init(init_qnx4_fs)
427module_exit(exit_qnx4_fs)
428MODULE_LICENSE("GPL");
429
430
