Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5d026c72 KB |
2 | /* |
3 | * QNX6 file system, Linux implementation. | |
4 | * | |
5 | * Version : 1.0.0 | |
6 | * | |
7 | * History : | |
8 | * | |
9 | * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release. | |
10 | * 16-02-2012 pagemap extension by Al Viro | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/highuid.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/buffer_head.h> | |
20 | #include <linux/writeback.h> | |
21 | #include <linux/statfs.h> | |
22 | #include <linux/parser.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/mount.h> | |
25 | #include <linux/crc32.h> | |
26 | #include <linux/mpage.h> | |
27 | #include "qnx6.h" | |
28 | ||
29 | static const struct super_operations qnx6_sops; | |
30 | ||
31 | static void qnx6_put_super(struct super_block *sb); | |
32 | static struct inode *qnx6_alloc_inode(struct super_block *sb); | |
45c2a3ff | 33 | static void qnx6_free_inode(struct inode *inode); |
5d026c72 KB |
34 | static int qnx6_remount(struct super_block *sb, int *flags, char *data); |
35 | static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf); | |
36 | static int qnx6_show_options(struct seq_file *seq, struct dentry *root); | |
37 | ||
38 | static const struct super_operations qnx6_sops = { | |
39 | .alloc_inode = qnx6_alloc_inode, | |
45c2a3ff | 40 | .free_inode = qnx6_free_inode, |
5d026c72 KB |
41 | .put_super = qnx6_put_super, |
42 | .statfs = qnx6_statfs, | |
43 | .remount_fs = qnx6_remount, | |
44 | .show_options = qnx6_show_options, | |
45 | }; | |
46 | ||
47 | static int qnx6_show_options(struct seq_file *seq, struct dentry *root) | |
48 | { | |
49 | struct super_block *sb = root->d_sb; | |
50 | struct qnx6_sb_info *sbi = QNX6_SB(sb); | |
51 | ||
52 | if (sbi->s_mount_opt & QNX6_MOUNT_MMI_FS) | |
53 | seq_puts(seq, ",mmi_fs"); | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static int qnx6_remount(struct super_block *sb, int *flags, char *data) | |
58 | { | |
02b9984d | 59 | sync_filesystem(sb); |
1751e8a6 | 60 | *flags |= SB_RDONLY; |
5d026c72 KB |
61 | return 0; |
62 | } | |
63 | ||
64 | static unsigned qnx6_get_devblock(struct super_block *sb, __fs32 block) | |
65 | { | |
66 | struct qnx6_sb_info *sbi = QNX6_SB(sb); | |
67 | return fs32_to_cpu(sbi, block) + sbi->s_blks_off; | |
68 | } | |
69 | ||
70 | static unsigned qnx6_block_map(struct inode *inode, unsigned iblock); | |
71 | ||
72 | static int qnx6_get_block(struct inode *inode, sector_t iblock, | |
73 | struct buffer_head *bh, int create) | |
74 | { | |
75 | unsigned phys; | |
76 | ||
fa5a7a41 FF |
77 | pr_debug("qnx6_get_block inode=[%ld] iblock=[%ld]\n", |
78 | inode->i_ino, (unsigned long)iblock); | |
5d026c72 KB |
79 | |
80 | phys = qnx6_block_map(inode, iblock); | |
81 | if (phys) { | |
82 | /* logical block is before EOF */ | |
83 | map_bh(bh, inode->i_sb, phys); | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static int qnx6_check_blockptr(__fs32 ptr) | |
89 | { | |
90 | if (ptr == ~(__fs32)0) { | |
e6c32616 | 91 | pr_err("hit unused blockpointer.\n"); |
5d026c72 KB |
92 | return 0; |
93 | } | |
94 | return 1; | |
95 | } | |
96 | ||
f132ab7d | 97 | static int qnx6_read_folio(struct file *file, struct folio *folio) |
5d026c72 | 98 | { |
f132ab7d | 99 | return mpage_read_folio(folio, qnx6_get_block); |
5d026c72 KB |
100 | } |
101 | ||
d4388340 | 102 | static void qnx6_readahead(struct readahead_control *rac) |
5d026c72 | 103 | { |
d4388340 | 104 | mpage_readahead(rac, qnx6_get_block); |
5d026c72 KB |
105 | } |
106 | ||
107 | /* | |
108 | * returns the block number for the no-th element in the tree | |
109 | * inodebits requred as there are multiple inodes in one inode block | |
110 | */ | |
111 | static unsigned qnx6_block_map(struct inode *inode, unsigned no) | |
112 | { | |
113 | struct super_block *s = inode->i_sb; | |
114 | struct qnx6_sb_info *sbi = QNX6_SB(s); | |
115 | struct qnx6_inode_info *ei = QNX6_I(inode); | |
116 | unsigned block = 0; | |
117 | struct buffer_head *bh; | |
118 | __fs32 ptr; | |
119 | int levelptr; | |
120 | int ptrbits = sbi->s_ptrbits; | |
121 | int bitdelta; | |
122 | u32 mask = (1 << ptrbits) - 1; | |
123 | int depth = ei->di_filelevels; | |
124 | int i; | |
125 | ||
126 | bitdelta = ptrbits * depth; | |
127 | levelptr = no >> bitdelta; | |
128 | ||
129 | if (levelptr > QNX6_NO_DIRECT_POINTERS - 1) { | |
e6c32616 | 130 | pr_err("Requested file block number (%u) too big.", no); |
5d026c72 KB |
131 | return 0; |
132 | } | |
133 | ||
134 | block = qnx6_get_devblock(s, ei->di_block_ptr[levelptr]); | |
135 | ||
136 | for (i = 0; i < depth; i++) { | |
137 | bh = sb_bread(s, block); | |
138 | if (!bh) { | |
e6c32616 | 139 | pr_err("Error reading block (%u)\n", block); |
5d026c72 KB |
140 | return 0; |
141 | } | |
142 | bitdelta -= ptrbits; | |
143 | levelptr = (no >> bitdelta) & mask; | |
144 | ptr = ((__fs32 *)bh->b_data)[levelptr]; | |
145 | ||
146 | if (!qnx6_check_blockptr(ptr)) | |
147 | return 0; | |
148 | ||
149 | block = qnx6_get_devblock(s, ptr); | |
150 | brelse(bh); | |
151 | } | |
152 | return block; | |
153 | } | |
154 | ||
155 | static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf) | |
156 | { | |
157 | struct super_block *sb = dentry->d_sb; | |
158 | struct qnx6_sb_info *sbi = QNX6_SB(sb); | |
159 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
160 | ||
161 | buf->f_type = sb->s_magic; | |
162 | buf->f_bsize = sb->s_blocksize; | |
163 | buf->f_blocks = fs32_to_cpu(sbi, sbi->sb->sb_num_blocks); | |
164 | buf->f_bfree = fs32_to_cpu(sbi, sbi->sb->sb_free_blocks); | |
165 | buf->f_files = fs32_to_cpu(sbi, sbi->sb->sb_num_inodes); | |
166 | buf->f_ffree = fs32_to_cpu(sbi, sbi->sb->sb_free_inodes); | |
167 | buf->f_bavail = buf->f_bfree; | |
168 | buf->f_namelen = QNX6_LONG_NAME_MAX; | |
6d1349c7 | 169 | buf->f_fsid = u64_to_fsid(id); |
5d026c72 KB |
170 | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Check the root directory of the filesystem to make sure | |
176 | * it really _is_ a qnx6 filesystem, and to check the size | |
177 | * of the directory entry. | |
178 | */ | |
179 | static const char *qnx6_checkroot(struct super_block *s) | |
180 | { | |
181 | static char match_root[2][3] = {".\0\0", "..\0"}; | |
182 | int i, error = 0; | |
183 | struct qnx6_dir_entry *dir_entry; | |
2b0143b5 | 184 | struct inode *root = d_inode(s->s_root); |
5d026c72 KB |
185 | struct address_space *mapping = root->i_mapping; |
186 | struct page *page = read_mapping_page(mapping, 0, NULL); | |
187 | if (IS_ERR(page)) | |
188 | return "error reading root directory"; | |
189 | kmap(page); | |
190 | dir_entry = page_address(page); | |
191 | for (i = 0; i < 2; i++) { | |
192 | /* maximum 3 bytes - due to match_root limitation */ | |
193 | if (strncmp(dir_entry[i].de_fname, match_root[i], 3)) | |
194 | error = 1; | |
195 | } | |
196 | qnx6_put_page(page); | |
197 | if (error) | |
198 | return "error reading root directory."; | |
199 | return NULL; | |
200 | } | |
201 | ||
202 | #ifdef CONFIG_QNX6FS_DEBUG | |
203 | void qnx6_superblock_debug(struct qnx6_super_block *sb, struct super_block *s) | |
204 | { | |
205 | struct qnx6_sb_info *sbi = QNX6_SB(s); | |
206 | ||
fa5a7a41 FF |
207 | pr_debug("magic: %08x\n", fs32_to_cpu(sbi, sb->sb_magic)); |
208 | pr_debug("checksum: %08x\n", fs32_to_cpu(sbi, sb->sb_checksum)); | |
209 | pr_debug("serial: %llx\n", fs64_to_cpu(sbi, sb->sb_serial)); | |
210 | pr_debug("flags: %08x\n", fs32_to_cpu(sbi, sb->sb_flags)); | |
211 | pr_debug("blocksize: %08x\n", fs32_to_cpu(sbi, sb->sb_blocksize)); | |
212 | pr_debug("num_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_num_inodes)); | |
213 | pr_debug("free_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_free_inodes)); | |
214 | pr_debug("num_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_num_blocks)); | |
215 | pr_debug("free_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_free_blocks)); | |
216 | pr_debug("inode_levels: %02x\n", sb->Inode.levels); | |
5d026c72 KB |
217 | } |
218 | #endif | |
219 | ||
220 | enum { | |
221 | Opt_mmifs, | |
222 | Opt_err | |
223 | }; | |
224 | ||
225 | static const match_table_t tokens = { | |
226 | {Opt_mmifs, "mmi_fs"}, | |
227 | {Opt_err, NULL} | |
228 | }; | |
229 | ||
230 | static int qnx6_parse_options(char *options, struct super_block *sb) | |
231 | { | |
232 | char *p; | |
233 | struct qnx6_sb_info *sbi = QNX6_SB(sb); | |
234 | substring_t args[MAX_OPT_ARGS]; | |
235 | ||
236 | if (!options) | |
237 | return 1; | |
238 | ||
239 | while ((p = strsep(&options, ",")) != NULL) { | |
240 | int token; | |
241 | if (!*p) | |
242 | continue; | |
243 | ||
244 | token = match_token(p, tokens, args); | |
245 | switch (token) { | |
246 | case Opt_mmifs: | |
247 | set_opt(sbi->s_mount_opt, MMI_FS); | |
248 | break; | |
249 | default: | |
250 | return 0; | |
251 | } | |
252 | } | |
253 | return 1; | |
254 | } | |
255 | ||
256 | static struct buffer_head *qnx6_check_first_superblock(struct super_block *s, | |
257 | int offset, int silent) | |
258 | { | |
259 | struct qnx6_sb_info *sbi = QNX6_SB(s); | |
260 | struct buffer_head *bh; | |
261 | struct qnx6_super_block *sb; | |
262 | ||
263 | /* Check the superblock signatures | |
264 | start with the first superblock */ | |
265 | bh = sb_bread(s, offset); | |
266 | if (!bh) { | |
e6c32616 | 267 | pr_err("unable to read the first superblock\n"); |
5d026c72 KB |
268 | return NULL; |
269 | } | |
270 | sb = (struct qnx6_super_block *)bh->b_data; | |
271 | if (fs32_to_cpu(sbi, sb->sb_magic) != QNX6_SUPER_MAGIC) { | |
272 | sbi->s_bytesex = BYTESEX_BE; | |
273 | if (fs32_to_cpu(sbi, sb->sb_magic) == QNX6_SUPER_MAGIC) { | |
274 | /* we got a big endian fs */ | |
fa5a7a41 | 275 | pr_debug("fs got different endianness.\n"); |
5d026c72 KB |
276 | return bh; |
277 | } else | |
278 | sbi->s_bytesex = BYTESEX_LE; | |
279 | if (!silent) { | |
280 | if (offset == 0) { | |
e6c32616 | 281 | pr_err("wrong signature (magic) in superblock #1.\n"); |
5d026c72 | 282 | } else { |
e6c32616 | 283 | pr_info("wrong signature (magic) at position (0x%lx) - will try alternative position (0x0000).\n", |
e00d5b5a | 284 | offset * s->s_blocksize); |
5d026c72 KB |
285 | } |
286 | } | |
287 | brelse(bh); | |
288 | return NULL; | |
289 | } | |
290 | return bh; | |
291 | } | |
292 | ||
293 | static struct inode *qnx6_private_inode(struct super_block *s, | |
294 | struct qnx6_root_node *p); | |
295 | ||
296 | static int qnx6_fill_super(struct super_block *s, void *data, int silent) | |
297 | { | |
298 | struct buffer_head *bh1 = NULL, *bh2 = NULL; | |
299 | struct qnx6_super_block *sb1 = NULL, *sb2 = NULL; | |
300 | struct qnx6_sb_info *sbi; | |
301 | struct inode *root; | |
302 | const char *errmsg; | |
303 | struct qnx6_sb_info *qs; | |
304 | int ret = -EINVAL; | |
305 | u64 offset; | |
306 | int bootblock_offset = QNX6_BOOTBLOCK_SIZE; | |
307 | ||
308 | qs = kzalloc(sizeof(struct qnx6_sb_info), GFP_KERNEL); | |
309 | if (!qs) | |
310 | return -ENOMEM; | |
311 | s->s_fs_info = qs; | |
312 | ||
313 | /* Superblock always is 512 Byte long */ | |
314 | if (!sb_set_blocksize(s, QNX6_SUPERBLOCK_SIZE)) { | |
e6c32616 | 315 | pr_err("unable to set blocksize\n"); |
5d026c72 KB |
316 | goto outnobh; |
317 | } | |
318 | ||
319 | /* parse the mount-options */ | |
320 | if (!qnx6_parse_options((char *) data, s)) { | |
e6c32616 | 321 | pr_err("invalid mount options.\n"); |
5d026c72 KB |
322 | goto outnobh; |
323 | } | |
324 | if (test_opt(s, MMI_FS)) { | |
325 | sb1 = qnx6_mmi_fill_super(s, silent); | |
326 | if (sb1) | |
327 | goto mmi_success; | |
328 | else | |
329 | goto outnobh; | |
330 | } | |
331 | sbi = QNX6_SB(s); | |
332 | sbi->s_bytesex = BYTESEX_LE; | |
333 | /* Check the superblock signatures | |
334 | start with the first superblock */ | |
335 | bh1 = qnx6_check_first_superblock(s, | |
336 | bootblock_offset / QNX6_SUPERBLOCK_SIZE, silent); | |
337 | if (!bh1) { | |
338 | /* try again without bootblock offset */ | |
339 | bh1 = qnx6_check_first_superblock(s, 0, silent); | |
340 | if (!bh1) { | |
e6c32616 | 341 | pr_err("unable to read the first superblock\n"); |
5d026c72 KB |
342 | goto outnobh; |
343 | } | |
344 | /* seems that no bootblock at partition start */ | |
345 | bootblock_offset = 0; | |
346 | } | |
347 | sb1 = (struct qnx6_super_block *)bh1->b_data; | |
348 | ||
349 | #ifdef CONFIG_QNX6FS_DEBUG | |
350 | qnx6_superblock_debug(sb1, s); | |
351 | #endif | |
352 | ||
353 | /* checksum check - start at byte 8 and end at byte 512 */ | |
354 | if (fs32_to_cpu(sbi, sb1->sb_checksum) != | |
355 | crc32_be(0, (char *)(bh1->b_data + 8), 504)) { | |
e6c32616 | 356 | pr_err("superblock #1 checksum error\n"); |
5d026c72 KB |
357 | goto out; |
358 | } | |
359 | ||
360 | /* set new blocksize */ | |
361 | if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) { | |
e6c32616 | 362 | pr_err("unable to set blocksize\n"); |
5d026c72 KB |
363 | goto out; |
364 | } | |
365 | /* blocksize invalidates bh - pull it back in */ | |
366 | brelse(bh1); | |
367 | bh1 = sb_bread(s, bootblock_offset >> s->s_blocksize_bits); | |
368 | if (!bh1) | |
369 | goto outnobh; | |
370 | sb1 = (struct qnx6_super_block *)bh1->b_data; | |
371 | ||
372 | /* calculate second superblock blocknumber */ | |
373 | offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) + | |
374 | (bootblock_offset >> s->s_blocksize_bits) + | |
375 | (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits); | |
376 | ||
377 | /* set bootblock offset */ | |
378 | sbi->s_blks_off = (bootblock_offset >> s->s_blocksize_bits) + | |
379 | (QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits); | |
380 | ||
381 | /* next the second superblock */ | |
382 | bh2 = sb_bread(s, offset); | |
383 | if (!bh2) { | |
e6c32616 | 384 | pr_err("unable to read the second superblock\n"); |
5d026c72 KB |
385 | goto out; |
386 | } | |
387 | sb2 = (struct qnx6_super_block *)bh2->b_data; | |
388 | if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) { | |
389 | if (!silent) | |
e6c32616 | 390 | pr_err("wrong signature (magic) in superblock #2.\n"); |
5d026c72 KB |
391 | goto out; |
392 | } | |
393 | ||
394 | /* checksum check - start at byte 8 and end at byte 512 */ | |
395 | if (fs32_to_cpu(sbi, sb2->sb_checksum) != | |
396 | crc32_be(0, (char *)(bh2->b_data + 8), 504)) { | |
e6c32616 | 397 | pr_err("superblock #2 checksum error\n"); |
5d026c72 KB |
398 | goto out; |
399 | } | |
400 | ||
401 | if (fs64_to_cpu(sbi, sb1->sb_serial) >= | |
402 | fs64_to_cpu(sbi, sb2->sb_serial)) { | |
403 | /* superblock #1 active */ | |
404 | sbi->sb_buf = bh1; | |
405 | sbi->sb = (struct qnx6_super_block *)bh1->b_data; | |
406 | brelse(bh2); | |
e6c32616 | 407 | pr_info("superblock #1 active\n"); |
5d026c72 KB |
408 | } else { |
409 | /* superblock #2 active */ | |
410 | sbi->sb_buf = bh2; | |
411 | sbi->sb = (struct qnx6_super_block *)bh2->b_data; | |
412 | brelse(bh1); | |
e6c32616 | 413 | pr_info("superblock #2 active\n"); |
5d026c72 KB |
414 | } |
415 | mmi_success: | |
416 | /* sanity check - limit maximum indirect pointer levels */ | |
417 | if (sb1->Inode.levels > QNX6_PTR_MAX_LEVELS) { | |
e6c32616 | 418 | pr_err("too many inode levels (max %i, sb %i)\n", |
e00d5b5a | 419 | QNX6_PTR_MAX_LEVELS, sb1->Inode.levels); |
5d026c72 KB |
420 | goto out; |
421 | } | |
422 | if (sb1->Longfile.levels > QNX6_PTR_MAX_LEVELS) { | |
e6c32616 | 423 | pr_err("too many longfilename levels (max %i, sb %i)\n", |
e00d5b5a | 424 | QNX6_PTR_MAX_LEVELS, sb1->Longfile.levels); |
5d026c72 KB |
425 | goto out; |
426 | } | |
427 | s->s_op = &qnx6_sops; | |
428 | s->s_magic = QNX6_SUPER_MAGIC; | |
1751e8a6 | 429 | s->s_flags |= SB_RDONLY; /* Yup, read-only yet */ |
22b13969 DD |
430 | s->s_time_min = 0; |
431 | s->s_time_max = U32_MAX; | |
5d026c72 KB |
432 | |
433 | /* ease the later tree level calculations */ | |
434 | sbi = QNX6_SB(s); | |
435 | sbi->s_ptrbits = ilog2(s->s_blocksize / 4); | |
436 | sbi->inodes = qnx6_private_inode(s, &sb1->Inode); | |
437 | if (!sbi->inodes) | |
438 | goto out; | |
439 | sbi->longfile = qnx6_private_inode(s, &sb1->Longfile); | |
440 | if (!sbi->longfile) | |
441 | goto out1; | |
442 | ||
443 | /* prefetch root inode */ | |
444 | root = qnx6_iget(s, QNX6_ROOT_INO); | |
445 | if (IS_ERR(root)) { | |
e6c32616 | 446 | pr_err("get inode failed\n"); |
5d026c72 KB |
447 | ret = PTR_ERR(root); |
448 | goto out2; | |
449 | } | |
450 | ||
451 | ret = -ENOMEM; | |
452 | s->s_root = d_make_root(root); | |
453 | if (!s->s_root) | |
454 | goto out2; | |
455 | ||
456 | ret = -EINVAL; | |
457 | errmsg = qnx6_checkroot(s); | |
458 | if (errmsg != NULL) { | |
459 | if (!silent) | |
e6c32616 | 460 | pr_err("%s\n", errmsg); |
5d026c72 KB |
461 | goto out3; |
462 | } | |
463 | return 0; | |
464 | ||
465 | out3: | |
466 | dput(s->s_root); | |
467 | s->s_root = NULL; | |
468 | out2: | |
469 | iput(sbi->longfile); | |
470 | out1: | |
471 | iput(sbi->inodes); | |
472 | out: | |
cba7543e MC |
473 | brelse(bh1); |
474 | brelse(bh2); | |
5d026c72 KB |
475 | outnobh: |
476 | kfree(qs); | |
477 | s->s_fs_info = NULL; | |
478 | return ret; | |
479 | } | |
480 | ||
481 | static void qnx6_put_super(struct super_block *sb) | |
482 | { | |
483 | struct qnx6_sb_info *qs = QNX6_SB(sb); | |
484 | brelse(qs->sb_buf); | |
485 | iput(qs->longfile); | |
486 | iput(qs->inodes); | |
487 | kfree(qs); | |
488 | sb->s_fs_info = NULL; | |
489 | return; | |
490 | } | |
491 | ||
492 | static sector_t qnx6_bmap(struct address_space *mapping, sector_t block) | |
493 | { | |
494 | return generic_block_bmap(mapping, block, qnx6_get_block); | |
495 | } | |
496 | static const struct address_space_operations qnx6_aops = { | |
f132ab7d | 497 | .read_folio = qnx6_read_folio, |
d4388340 | 498 | .readahead = qnx6_readahead, |
5d026c72 KB |
499 | .bmap = qnx6_bmap |
500 | }; | |
501 | ||
502 | static struct inode *qnx6_private_inode(struct super_block *s, | |
503 | struct qnx6_root_node *p) | |
504 | { | |
505 | struct inode *inode = new_inode(s); | |
506 | if (inode) { | |
507 | struct qnx6_inode_info *ei = QNX6_I(inode); | |
508 | struct qnx6_sb_info *sbi = QNX6_SB(s); | |
509 | inode->i_size = fs64_to_cpu(sbi, p->size); | |
510 | memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr)); | |
511 | ei->di_filelevels = p->levels; | |
512 | inode->i_mode = S_IFREG | S_IRUSR; /* probably wrong */ | |
513 | inode->i_mapping->a_ops = &qnx6_aops; | |
514 | } | |
515 | return inode; | |
516 | } | |
517 | ||
518 | struct inode *qnx6_iget(struct super_block *sb, unsigned ino) | |
519 | { | |
520 | struct qnx6_sb_info *sbi = QNX6_SB(sb); | |
521 | struct qnx6_inode_entry *raw_inode; | |
522 | struct inode *inode; | |
523 | struct qnx6_inode_info *ei; | |
524 | struct address_space *mapping; | |
525 | struct page *page; | |
526 | u32 n, offs; | |
527 | ||
528 | inode = iget_locked(sb, ino); | |
529 | if (!inode) | |
530 | return ERR_PTR(-ENOMEM); | |
531 | if (!(inode->i_state & I_NEW)) | |
532 | return inode; | |
533 | ||
534 | ei = QNX6_I(inode); | |
535 | ||
536 | inode->i_mode = 0; | |
537 | ||
538 | if (ino == 0) { | |
e6c32616 | 539 | pr_err("bad inode number on dev %s: %u is out of range\n", |
5d026c72 KB |
540 | sb->s_id, ino); |
541 | iget_failed(inode); | |
542 | return ERR_PTR(-EIO); | |
543 | } | |
09cbfeaf KS |
544 | n = (ino - 1) >> (PAGE_SHIFT - QNX6_INODE_SIZE_BITS); |
545 | offs = (ino - 1) & (~PAGE_MASK >> QNX6_INODE_SIZE_BITS); | |
5d026c72 KB |
546 | mapping = sbi->inodes->i_mapping; |
547 | page = read_mapping_page(mapping, n, NULL); | |
548 | if (IS_ERR(page)) { | |
e6c32616 | 549 | pr_err("major problem: unable to read inode from dev %s\n", |
e00d5b5a | 550 | sb->s_id); |
5d026c72 KB |
551 | iget_failed(inode); |
552 | return ERR_CAST(page); | |
553 | } | |
554 | kmap(page); | |
555 | raw_inode = ((struct qnx6_inode_entry *)page_address(page)) + offs; | |
556 | ||
557 | inode->i_mode = fs16_to_cpu(sbi, raw_inode->di_mode); | |
85a03d1b EB |
558 | i_uid_write(inode, (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid)); |
559 | i_gid_write(inode, (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid)); | |
5d026c72 | 560 | inode->i_size = fs64_to_cpu(sbi, raw_inode->di_size); |
c2c08f3f JL |
561 | inode_set_mtime(inode, fs32_to_cpu(sbi, raw_inode->di_mtime), 0); |
562 | inode_set_atime(inode, fs32_to_cpu(sbi, raw_inode->di_atime), 0); | |
ade79b7c | 563 | inode_set_ctime(inode, fs32_to_cpu(sbi, raw_inode->di_ctime), 0); |
5d026c72 KB |
564 | |
565 | /* calc blocks based on 512 byte blocksize */ | |
566 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
567 | ||
568 | memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr, | |
569 | sizeof(raw_inode->di_block_ptr)); | |
570 | ei->di_filelevels = raw_inode->di_filelevels; | |
571 | ||
572 | if (S_ISREG(inode->i_mode)) { | |
573 | inode->i_fop = &generic_ro_fops; | |
574 | inode->i_mapping->a_ops = &qnx6_aops; | |
575 | } else if (S_ISDIR(inode->i_mode)) { | |
576 | inode->i_op = &qnx6_dir_inode_operations; | |
577 | inode->i_fop = &qnx6_dir_operations; | |
578 | inode->i_mapping->a_ops = &qnx6_aops; | |
579 | } else if (S_ISLNK(inode->i_mode)) { | |
580 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 581 | inode_nohighmem(inode); |
5d026c72 KB |
582 | inode->i_mapping->a_ops = &qnx6_aops; |
583 | } else | |
584 | init_special_inode(inode, inode->i_mode, 0); | |
585 | qnx6_put_page(page); | |
586 | unlock_new_inode(inode); | |
587 | return inode; | |
588 | } | |
589 | ||
590 | static struct kmem_cache *qnx6_inode_cachep; | |
591 | ||
592 | static struct inode *qnx6_alloc_inode(struct super_block *sb) | |
593 | { | |
594 | struct qnx6_inode_info *ei; | |
fd60b288 | 595 | ei = alloc_inode_sb(sb, qnx6_inode_cachep, GFP_KERNEL); |
5d026c72 KB |
596 | if (!ei) |
597 | return NULL; | |
598 | return &ei->vfs_inode; | |
599 | } | |
600 | ||
45c2a3ff | 601 | static void qnx6_free_inode(struct inode *inode) |
5d026c72 | 602 | { |
5d026c72 KB |
603 | kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode)); |
604 | } | |
605 | ||
5d026c72 KB |
606 | static void init_once(void *foo) |
607 | { | |
608 | struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo; | |
609 | ||
610 | inode_init_once(&ei->vfs_inode); | |
611 | } | |
612 | ||
613 | static int init_inodecache(void) | |
614 | { | |
615 | qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache", | |
616 | sizeof(struct qnx6_inode_info), | |
617 | 0, (SLAB_RECLAIM_ACCOUNT| | |
5d097056 | 618 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
5d026c72 KB |
619 | init_once); |
620 | if (!qnx6_inode_cachep) | |
621 | return -ENOMEM; | |
622 | return 0; | |
623 | } | |
624 | ||
625 | static void destroy_inodecache(void) | |
626 | { | |
8c0a8537 KS |
627 | /* |
628 | * Make sure all delayed rcu free inodes are flushed before we | |
629 | * destroy cache. | |
630 | */ | |
631 | rcu_barrier(); | |
5d026c72 KB |
632 | kmem_cache_destroy(qnx6_inode_cachep); |
633 | } | |
634 | ||
635 | static struct dentry *qnx6_mount(struct file_system_type *fs_type, | |
636 | int flags, const char *dev_name, void *data) | |
637 | { | |
638 | return mount_bdev(fs_type, flags, dev_name, data, qnx6_fill_super); | |
639 | } | |
640 | ||
641 | static struct file_system_type qnx6_fs_type = { | |
642 | .owner = THIS_MODULE, | |
643 | .name = "qnx6", | |
644 | .mount = qnx6_mount, | |
645 | .kill_sb = kill_block_super, | |
646 | .fs_flags = FS_REQUIRES_DEV, | |
647 | }; | |
7f78e035 | 648 | MODULE_ALIAS_FS("qnx6"); |
5d026c72 KB |
649 | |
650 | static int __init init_qnx6_fs(void) | |
651 | { | |
652 | int err; | |
653 | ||
654 | err = init_inodecache(); | |
655 | if (err) | |
656 | return err; | |
657 | ||
658 | err = register_filesystem(&qnx6_fs_type); | |
659 | if (err) { | |
660 | destroy_inodecache(); | |
661 | return err; | |
662 | } | |
663 | ||
e00d5b5a | 664 | pr_info("QNX6 filesystem 1.0.0 registered.\n"); |
5d026c72 KB |
665 | return 0; |
666 | } | |
667 | ||
668 | static void __exit exit_qnx6_fs(void) | |
669 | { | |
670 | unregister_filesystem(&qnx6_fs_type); | |
671 | destroy_inodecache(); | |
672 | } | |
673 | ||
674 | module_init(init_qnx6_fs) | |
675 | module_exit(exit_qnx6_fs) | |
676 | MODULE_LICENSE("GPL"); |