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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 qs = qnx4_sb(sb);
48 qs->Version = QNX4_VERSION;
49 *flags |= MS_RDONLY;
50 return 0;
51}
52
53static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
54{
55 unsigned long phys;
56
57 QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
58
59 phys = qnx4_block_map( inode, iblock );
60 if ( phys ) {
61
62 map_bh(bh, inode->i_sb, phys);
63 }
64 return 0;
65}
66
67static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset)
68{
69 u32 size = le32_to_cpu(extent->xtnt_size);
70 if (*offset < size)
71 return le32_to_cpu(extent->xtnt_blk) + *offset - 1;
72 *offset -= size;
73 return 0;
74}
75
76unsigned long qnx4_block_map( struct inode *inode, long iblock )
77{
78 int ix;
79 long i_xblk;
80 struct buffer_head *bh = NULL;
81 struct qnx4_xblk *xblk = NULL;
82 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
83 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
84 u32 offset = iblock;
85 u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);
86
87 if (block) {
88
89 } else {
90
91 i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
92 ix = 0;
93 while ( --nxtnt > 0 ) {
94 if ( ix == 0 ) {
95
96 bh = sb_bread(inode->i_sb, i_xblk - 1);
97 if ( !bh ) {
98 QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
99 return -EIO;
100 }
101 xblk = (struct qnx4_xblk*)bh->b_data;
102 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
103 QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
104 return -EIO;
105 }
106 }
107 block = try_extent(&xblk->xblk_xtnts[ix], &offset);
108 if (block) {
109
110 break;
111 }
112 if ( ++ix >= xblk->xblk_num_xtnts ) {
113 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
114 ix = 0;
115 brelse( bh );
116 bh = NULL;
117 }
118 }
119 if ( bh )
120 brelse( bh );
121 }
122
123 QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
124 return block;
125}
126
127static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
128{
129 struct super_block *sb = dentry->d_sb;
130 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
131
132 buf->f_type = sb->s_magic;
133 buf->f_bsize = sb->s_blocksize;
134 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
135 buf->f_bfree = qnx4_count_free_blocks(sb);
136 buf->f_bavail = buf->f_bfree;
137 buf->f_namelen = QNX4_NAME_MAX;
138 buf->f_fsid.val[0] = (u32)id;
139 buf->f_fsid.val[1] = (u32)(id >> 32);
140
141 return 0;
142}
143
144
145
146
147
148
149static const char *qnx4_checkroot(struct super_block *sb,
150 struct qnx4_super_block *s)
151{
152 struct buffer_head *bh;
153 struct qnx4_inode_entry *rootdir;
154 int rd, rl;
155 int i, j;
156
157 if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0')
158 return "no qnx4 filesystem (no root dir).";
159 QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
160 rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1;
161 rl = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_size);
162 for (j = 0; j < rl; j++) {
163 bh = sb_bread(sb, rd + j);
164 if (bh == NULL)
165 return "unable to read root entry.";
166 rootdir = (struct qnx4_inode_entry *) bh->b_data;
167 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
168 QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
169 if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
170 continue;
171 qnx4_sb(sb)->BitMap = kmemdup(rootdir,
172 sizeof(struct qnx4_inode_entry),
173 GFP_KERNEL);
174 brelse(bh);
175 if (!qnx4_sb(sb)->BitMap)
176 return "not enough memory for bitmap inode";
177
178 return NULL;
179 }
180 brelse(bh);
181 }
182 return "bitmap file not found.";
183}
184
185static int qnx4_fill_super(struct super_block *s, void *data, int silent)
186{
187 struct buffer_head *bh;
188 struct inode *root;
189 const char *errmsg;
190 struct qnx4_sb_info *qs;
191
192 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
193 if (!qs)
194 return -ENOMEM;
195 s->s_fs_info = qs;
196
197 sb_set_blocksize(s, QNX4_BLOCK_SIZE);
198
199 s->s_op = &qnx4_sops;
200 s->s_magic = QNX4_SUPER_MAGIC;
201 s->s_flags |= MS_RDONLY;
202
203
204
205
206 bh = sb_bread(s, 1);
207 if (!bh) {
208 printk(KERN_ERR "qnx4: unable to read the superblock\n");
209 return -EINVAL;
210 }
211
212
213 errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
214 brelse(bh);
215 if (errmsg != NULL) {
216 if (!silent)
217 printk(KERN_ERR "qnx4: %s\n", errmsg);
218 return -EINVAL;
219 }
220
221
222 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
223 if (IS_ERR(root)) {
224 printk(KERN_ERR "qnx4: get inode failed\n");
225 return PTR_ERR(root);
226 }
227
228 s->s_root = d_make_root(root);
229 if (s->s_root == NULL)
230 return -ENOMEM;
231
232 return 0;
233}
234
235static void qnx4_kill_sb(struct super_block *sb)
236{
237 struct qnx4_sb_info *qs = qnx4_sb(sb);
238 kill_block_super(sb);
239 if (qs) {
240 kfree(qs->BitMap);
241 kfree(qs);
242 }
243}
244
245static int qnx4_readpage(struct file *file, struct page *page)
246{
247 return block_read_full_page(page,qnx4_get_block);
248}
249
250static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
251{
252 return generic_block_bmap(mapping,block,qnx4_get_block);
253}
254static const struct address_space_operations qnx4_aops = {
255 .readpage = qnx4_readpage,
256 .bmap = qnx4_bmap
257};
258
259struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
260{
261 struct buffer_head *bh;
262 struct qnx4_inode_entry *raw_inode;
263 int block;
264 struct qnx4_inode_entry *qnx4_inode;
265 struct inode *inode;
266
267 inode = iget_locked(sb, ino);
268 if (!inode)
269 return ERR_PTR(-ENOMEM);
270 if (!(inode->i_state & I_NEW))
271 return inode;
272
273 qnx4_inode = qnx4_raw_inode(inode);
274 inode->i_mode = 0;
275
276 QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
277 if (!ino) {
278 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
279 "out of range\n",
280 sb->s_id, ino);
281 iget_failed(inode);
282 return ERR_PTR(-EIO);
283 }
284 block = ino / QNX4_INODES_PER_BLOCK;
285
286 if (!(bh = sb_bread(sb, block))) {
287 printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
288 "%s\n", sb->s_id);
289 iget_failed(inode);
290 return ERR_PTR(-EIO);
291 }
292 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
293 (ino % QNX4_INODES_PER_BLOCK);
294
295 inode->i_mode = le16_to_cpu(raw_inode->di_mode);
296 i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid));
297 i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid));
298 set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
299 inode->i_size = le32_to_cpu(raw_inode->di_size);
300 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
301 inode->i_mtime.tv_nsec = 0;
302 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
303 inode->i_atime.tv_nsec = 0;
304 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
305 inode->i_ctime.tv_nsec = 0;
306 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
307
308 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
309 if (S_ISREG(inode->i_mode)) {
310 inode->i_fop = &generic_ro_fops;
311 inode->i_mapping->a_ops = &qnx4_aops;
312 qnx4_i(inode)->mmu_private = inode->i_size;
313 } else if (S_ISDIR(inode->i_mode)) {
314 inode->i_op = &qnx4_dir_inode_operations;
315 inode->i_fop = &qnx4_dir_operations;
316 } else if (S_ISLNK(inode->i_mode)) {
317 inode->i_op = &page_symlink_inode_operations;
318 inode->i_mapping->a_ops = &qnx4_aops;
319 qnx4_i(inode)->mmu_private = inode->i_size;
320 } else {
321 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
322 ino, sb->s_id);
323 iget_failed(inode);
324 brelse(bh);
325 return ERR_PTR(-EIO);
326 }
327 brelse(bh);
328 unlock_new_inode(inode);
329 return inode;
330}
331
332static struct kmem_cache *qnx4_inode_cachep;
333
334static struct inode *qnx4_alloc_inode(struct super_block *sb)
335{
336 struct qnx4_inode_info *ei;
337 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
338 if (!ei)
339 return NULL;
340 return &ei->vfs_inode;
341}
342
343static void qnx4_i_callback(struct rcu_head *head)
344{
345 struct inode *inode = container_of(head, struct inode, i_rcu);
346 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
347}
348
349static void qnx4_destroy_inode(struct inode *inode)
350{
351 call_rcu(&inode->i_rcu, qnx4_i_callback);
352}
353
354static void init_once(void *foo)
355{
356 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
357
358 inode_init_once(&ei->vfs_inode);
359}
360
361static int init_inodecache(void)
362{
363 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
364 sizeof(struct qnx4_inode_info),
365 0, (SLAB_RECLAIM_ACCOUNT|
366 SLAB_MEM_SPREAD),
367 init_once);
368 if (qnx4_inode_cachep == NULL)
369 return -ENOMEM;
370 return 0;
371}
372
373static void destroy_inodecache(void)
374{
375
376
377
378
379 rcu_barrier();
380 kmem_cache_destroy(qnx4_inode_cachep);
381}
382
383static struct dentry *qnx4_mount(struct file_system_type *fs_type,
384 int flags, const char *dev_name, void *data)
385{
386 return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
387}
388
389static struct file_system_type qnx4_fs_type = {
390 .owner = THIS_MODULE,
391 .name = "qnx4",
392 .mount = qnx4_mount,
393 .kill_sb = qnx4_kill_sb,
394 .fs_flags = FS_REQUIRES_DEV,
395};
396MODULE_ALIAS_FS("qnx4");
397
398static int __init init_qnx4_fs(void)
399{
400 int err;
401
402 err = init_inodecache();
403 if (err)
404 return err;
405
406 err = register_filesystem(&qnx4_fs_type);
407 if (err) {
408 destroy_inodecache();
409 return err;
410 }
411
412 printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
413 return 0;
414}
415
416static void __exit exit_qnx4_fs(void)
417{
418 unregister_filesystem(&qnx4_fs_type);
419 destroy_inodecache();
420}
421
422module_init(init_qnx4_fs)
423module_exit(exit_qnx4_fs)
424MODULE_LICENSE("GPL");
425
426
