Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/affs/file.c | |
3 | * | |
4 | * (c) 1996 Hans-Joachim Widmaier - Rewritten | |
5 | * | |
6 | * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. | |
7 | * | |
8 | * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. | |
9 | * | |
10 | * (C) 1991 Linus Torvalds - minix filesystem | |
11 | * | |
12 | * affs regular file handling primitives | |
13 | */ | |
14 | ||
15 | #include "affs.h" | |
16 | ||
17 | #if PAGE_SIZE < 4096 | |
18 | #error PAGE_SIZE must be at least 4096 | |
19 | #endif | |
20 | ||
21 | static int affs_grow_extcache(struct inode *inode, u32 lc_idx); | |
22 | static struct buffer_head *affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext); | |
23 | static inline struct buffer_head *affs_get_extblock(struct inode *inode, u32 ext); | |
24 | static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext); | |
25 | static ssize_t affs_file_write(struct file *filp, const char __user *buf, size_t count, loff_t *ppos); | |
26 | static int affs_file_open(struct inode *inode, struct file *filp); | |
27 | static int affs_file_release(struct inode *inode, struct file *filp); | |
28 | ||
29 | struct file_operations affs_file_operations = { | |
30 | .llseek = generic_file_llseek, | |
31 | .read = generic_file_read, | |
32 | .write = affs_file_write, | |
33 | .mmap = generic_file_mmap, | |
34 | .open = affs_file_open, | |
35 | .release = affs_file_release, | |
36 | .fsync = file_fsync, | |
37 | .sendfile = generic_file_sendfile, | |
38 | }; | |
39 | ||
40 | struct inode_operations affs_file_inode_operations = { | |
41 | .truncate = affs_truncate, | |
42 | .setattr = affs_notify_change, | |
43 | }; | |
44 | ||
45 | static int | |
46 | affs_file_open(struct inode *inode, struct file *filp) | |
47 | { | |
48 | if (atomic_read(&filp->f_count) != 1) | |
49 | return 0; | |
50 | pr_debug("AFFS: open(%d)\n", AFFS_I(inode)->i_opencnt); | |
51 | AFFS_I(inode)->i_opencnt++; | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int | |
56 | affs_file_release(struct inode *inode, struct file *filp) | |
57 | { | |
58 | if (atomic_read(&filp->f_count) != 0) | |
59 | return 0; | |
60 | pr_debug("AFFS: release(%d)\n", AFFS_I(inode)->i_opencnt); | |
61 | AFFS_I(inode)->i_opencnt--; | |
62 | if (!AFFS_I(inode)->i_opencnt) | |
63 | affs_free_prealloc(inode); | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static int | |
69 | affs_grow_extcache(struct inode *inode, u32 lc_idx) | |
70 | { | |
71 | struct super_block *sb = inode->i_sb; | |
72 | struct buffer_head *bh; | |
73 | u32 lc_max; | |
74 | int i, j, key; | |
75 | ||
76 | if (!AFFS_I(inode)->i_lc) { | |
77 | char *ptr = (char *)get_zeroed_page(GFP_NOFS); | |
78 | if (!ptr) | |
79 | return -ENOMEM; | |
80 | AFFS_I(inode)->i_lc = (u32 *)ptr; | |
81 | AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2); | |
82 | } | |
83 | ||
84 | lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift; | |
85 | ||
86 | if (AFFS_I(inode)->i_extcnt > lc_max) { | |
87 | u32 lc_shift, lc_mask, tmp, off; | |
88 | ||
89 | /* need to recalculate linear cache, start from old size */ | |
90 | lc_shift = AFFS_I(inode)->i_lc_shift; | |
91 | tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift; | |
92 | for (; tmp; tmp >>= 1) | |
93 | lc_shift++; | |
94 | lc_mask = (1 << lc_shift) - 1; | |
95 | ||
96 | /* fix idx and old size to new shift */ | |
97 | lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift); | |
98 | AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift); | |
99 | ||
100 | /* first shrink old cache to make more space */ | |
101 | off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift); | |
102 | for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off) | |
103 | AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j]; | |
104 | ||
105 | AFFS_I(inode)->i_lc_shift = lc_shift; | |
106 | AFFS_I(inode)->i_lc_mask = lc_mask; | |
107 | } | |
108 | ||
109 | /* fill cache to the needed index */ | |
110 | i = AFFS_I(inode)->i_lc_size; | |
111 | AFFS_I(inode)->i_lc_size = lc_idx + 1; | |
112 | for (; i <= lc_idx; i++) { | |
113 | if (!i) { | |
114 | AFFS_I(inode)->i_lc[0] = inode->i_ino; | |
115 | continue; | |
116 | } | |
117 | key = AFFS_I(inode)->i_lc[i - 1]; | |
118 | j = AFFS_I(inode)->i_lc_mask + 1; | |
119 | // unlock cache | |
120 | for (; j > 0; j--) { | |
121 | bh = affs_bread(sb, key); | |
122 | if (!bh) | |
123 | goto err; | |
124 | key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
125 | affs_brelse(bh); | |
126 | } | |
127 | // lock cache | |
128 | AFFS_I(inode)->i_lc[i] = key; | |
129 | } | |
130 | ||
131 | return 0; | |
132 | ||
133 | err: | |
134 | // lock cache | |
135 | return -EIO; | |
136 | } | |
137 | ||
138 | static struct buffer_head * | |
139 | affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext) | |
140 | { | |
141 | struct super_block *sb = inode->i_sb; | |
142 | struct buffer_head *new_bh; | |
143 | u32 blocknr, tmp; | |
144 | ||
145 | blocknr = affs_alloc_block(inode, bh->b_blocknr); | |
146 | if (!blocknr) | |
147 | return ERR_PTR(-ENOSPC); | |
148 | ||
149 | new_bh = affs_getzeroblk(sb, blocknr); | |
150 | if (!new_bh) { | |
151 | affs_free_block(sb, blocknr); | |
152 | return ERR_PTR(-EIO); | |
153 | } | |
154 | ||
155 | AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST); | |
156 | AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr); | |
157 | AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE); | |
158 | AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino); | |
159 | affs_fix_checksum(sb, new_bh); | |
160 | ||
161 | mark_buffer_dirty_inode(new_bh, inode); | |
162 | ||
163 | tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
164 | if (tmp) | |
165 | affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp); | |
166 | AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr); | |
167 | affs_adjust_checksum(bh, blocknr - tmp); | |
168 | mark_buffer_dirty_inode(bh, inode); | |
169 | ||
170 | AFFS_I(inode)->i_extcnt++; | |
171 | mark_inode_dirty(inode); | |
172 | ||
173 | return new_bh; | |
174 | } | |
175 | ||
176 | static inline struct buffer_head * | |
177 | affs_get_extblock(struct inode *inode, u32 ext) | |
178 | { | |
179 | /* inline the simplest case: same extended block as last time */ | |
180 | struct buffer_head *bh = AFFS_I(inode)->i_ext_bh; | |
181 | if (ext == AFFS_I(inode)->i_ext_last) | |
182 | atomic_inc(&bh->b_count); | |
183 | else | |
184 | /* we have to do more (not inlined) */ | |
185 | bh = affs_get_extblock_slow(inode, ext); | |
186 | ||
187 | return bh; | |
188 | } | |
189 | ||
190 | static struct buffer_head * | |
191 | affs_get_extblock_slow(struct inode *inode, u32 ext) | |
192 | { | |
193 | struct super_block *sb = inode->i_sb; | |
194 | struct buffer_head *bh; | |
195 | u32 ext_key; | |
196 | u32 lc_idx, lc_off, ac_idx; | |
197 | u32 tmp, idx; | |
198 | ||
199 | if (ext == AFFS_I(inode)->i_ext_last + 1) { | |
200 | /* read the next extended block from the current one */ | |
201 | bh = AFFS_I(inode)->i_ext_bh; | |
202 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
203 | if (ext < AFFS_I(inode)->i_extcnt) | |
204 | goto read_ext; | |
205 | if (ext > AFFS_I(inode)->i_extcnt) | |
206 | BUG(); | |
207 | bh = affs_alloc_extblock(inode, bh, ext); | |
208 | if (IS_ERR(bh)) | |
209 | return bh; | |
210 | goto store_ext; | |
211 | } | |
212 | ||
213 | if (ext == 0) { | |
214 | /* we seek back to the file header block */ | |
215 | ext_key = inode->i_ino; | |
216 | goto read_ext; | |
217 | } | |
218 | ||
219 | if (ext >= AFFS_I(inode)->i_extcnt) { | |
220 | struct buffer_head *prev_bh; | |
221 | ||
222 | /* allocate a new extended block */ | |
223 | if (ext > AFFS_I(inode)->i_extcnt) | |
224 | BUG(); | |
225 | ||
226 | /* get previous extended block */ | |
227 | prev_bh = affs_get_extblock(inode, ext - 1); | |
228 | if (IS_ERR(prev_bh)) | |
229 | return prev_bh; | |
230 | bh = affs_alloc_extblock(inode, prev_bh, ext); | |
231 | affs_brelse(prev_bh); | |
232 | if (IS_ERR(bh)) | |
233 | return bh; | |
234 | goto store_ext; | |
235 | } | |
236 | ||
237 | again: | |
238 | /* check if there is an extended cache and whether it's large enough */ | |
239 | lc_idx = ext >> AFFS_I(inode)->i_lc_shift; | |
240 | lc_off = ext & AFFS_I(inode)->i_lc_mask; | |
241 | ||
242 | if (lc_idx >= AFFS_I(inode)->i_lc_size) { | |
243 | int err; | |
244 | ||
245 | err = affs_grow_extcache(inode, lc_idx); | |
246 | if (err) | |
247 | return ERR_PTR(err); | |
248 | goto again; | |
249 | } | |
250 | ||
251 | /* every n'th key we find in the linear cache */ | |
252 | if (!lc_off) { | |
253 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; | |
254 | goto read_ext; | |
255 | } | |
256 | ||
257 | /* maybe it's still in the associative cache */ | |
258 | ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK; | |
259 | if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) { | |
260 | ext_key = AFFS_I(inode)->i_ac[ac_idx].key; | |
261 | goto read_ext; | |
262 | } | |
263 | ||
264 | /* try to find one of the previous extended blocks */ | |
265 | tmp = ext; | |
266 | idx = ac_idx; | |
267 | while (--tmp, --lc_off > 0) { | |
268 | idx = (idx - 1) & AFFS_AC_MASK; | |
269 | if (AFFS_I(inode)->i_ac[idx].ext == tmp) { | |
270 | ext_key = AFFS_I(inode)->i_ac[idx].key; | |
271 | goto find_ext; | |
272 | } | |
273 | } | |
274 | ||
275 | /* fall back to the linear cache */ | |
276 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; | |
277 | find_ext: | |
278 | /* read all extended blocks until we find the one we need */ | |
279 | //unlock cache | |
280 | do { | |
281 | bh = affs_bread(sb, ext_key); | |
282 | if (!bh) | |
283 | goto err_bread; | |
284 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
285 | affs_brelse(bh); | |
286 | tmp++; | |
287 | } while (tmp < ext); | |
288 | //lock cache | |
289 | ||
290 | /* store it in the associative cache */ | |
291 | // recalculate ac_idx? | |
292 | AFFS_I(inode)->i_ac[ac_idx].ext = ext; | |
293 | AFFS_I(inode)->i_ac[ac_idx].key = ext_key; | |
294 | ||
295 | read_ext: | |
296 | /* finally read the right extended block */ | |
297 | //unlock cache | |
298 | bh = affs_bread(sb, ext_key); | |
299 | if (!bh) | |
300 | goto err_bread; | |
301 | //lock cache | |
302 | ||
303 | store_ext: | |
304 | /* release old cached extended block and store the new one */ | |
305 | affs_brelse(AFFS_I(inode)->i_ext_bh); | |
306 | AFFS_I(inode)->i_ext_last = ext; | |
307 | AFFS_I(inode)->i_ext_bh = bh; | |
308 | atomic_inc(&bh->b_count); | |
309 | ||
310 | return bh; | |
311 | ||
312 | err_bread: | |
313 | affs_brelse(bh); | |
314 | return ERR_PTR(-EIO); | |
315 | } | |
316 | ||
317 | static int | |
318 | affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) | |
319 | { | |
320 | struct super_block *sb = inode->i_sb; | |
321 | struct buffer_head *ext_bh; | |
322 | u32 ext; | |
323 | ||
324 | pr_debug("AFFS: get_block(%u, %lu)\n", (u32)inode->i_ino, (unsigned long)block); | |
325 | ||
326 | ||
327 | if (block > (sector_t)0x7fffffffUL) | |
328 | BUG(); | |
329 | ||
330 | if (block >= AFFS_I(inode)->i_blkcnt) { | |
331 | if (block > AFFS_I(inode)->i_blkcnt || !create) | |
332 | goto err_big; | |
333 | } else | |
334 | create = 0; | |
335 | ||
336 | //lock cache | |
337 | affs_lock_ext(inode); | |
338 | ||
339 | ext = (u32)block / AFFS_SB(sb)->s_hashsize; | |
340 | block -= ext * AFFS_SB(sb)->s_hashsize; | |
341 | ext_bh = affs_get_extblock(inode, ext); | |
342 | if (IS_ERR(ext_bh)) | |
343 | goto err_ext; | |
344 | map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block))); | |
345 | ||
346 | if (create) { | |
347 | u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr); | |
348 | if (!blocknr) | |
349 | goto err_alloc; | |
350 | set_buffer_new(bh_result); | |
351 | AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize; | |
352 | AFFS_I(inode)->i_blkcnt++; | |
353 | ||
354 | /* store new block */ | |
355 | if (bh_result->b_blocknr) | |
356 | affs_warning(sb, "get_block", "block already set (%x)", bh_result->b_blocknr); | |
357 | AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr); | |
358 | AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1); | |
359 | affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1); | |
360 | bh_result->b_blocknr = blocknr; | |
361 | ||
362 | if (!block) { | |
363 | /* insert first block into header block */ | |
364 | u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data); | |
365 | if (tmp) | |
366 | affs_warning(sb, "get_block", "first block already set (%d)", tmp); | |
367 | AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr); | |
368 | affs_adjust_checksum(ext_bh, blocknr - tmp); | |
369 | } | |
370 | } | |
371 | ||
372 | affs_brelse(ext_bh); | |
373 | //unlock cache | |
374 | affs_unlock_ext(inode); | |
375 | return 0; | |
376 | ||
377 | err_big: | |
378 | affs_error(inode->i_sb,"get_block","strange block request %d", block); | |
379 | return -EIO; | |
380 | err_ext: | |
381 | // unlock cache | |
382 | affs_unlock_ext(inode); | |
383 | return PTR_ERR(ext_bh); | |
384 | err_alloc: | |
385 | brelse(ext_bh); | |
386 | clear_buffer_mapped(bh_result); | |
387 | bh_result->b_bdev = NULL; | |
388 | // unlock cache | |
389 | affs_unlock_ext(inode); | |
390 | return -ENOSPC; | |
391 | } | |
392 | ||
393 | static int affs_writepage(struct page *page, struct writeback_control *wbc) | |
394 | { | |
395 | return block_write_full_page(page, affs_get_block, wbc); | |
396 | } | |
397 | static int affs_readpage(struct file *file, struct page *page) | |
398 | { | |
399 | return block_read_full_page(page, affs_get_block); | |
400 | } | |
401 | static int affs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) | |
402 | { | |
403 | return cont_prepare_write(page, from, to, affs_get_block, | |
404 | &AFFS_I(page->mapping->host)->mmu_private); | |
405 | } | |
406 | static sector_t _affs_bmap(struct address_space *mapping, sector_t block) | |
407 | { | |
408 | return generic_block_bmap(mapping,block,affs_get_block); | |
409 | } | |
410 | struct address_space_operations affs_aops = { | |
411 | .readpage = affs_readpage, | |
412 | .writepage = affs_writepage, | |
413 | .sync_page = block_sync_page, | |
414 | .prepare_write = affs_prepare_write, | |
415 | .commit_write = generic_commit_write, | |
416 | .bmap = _affs_bmap | |
417 | }; | |
418 | ||
419 | static inline struct buffer_head * | |
420 | affs_bread_ino(struct inode *inode, int block, int create) | |
421 | { | |
422 | struct buffer_head *bh, tmp_bh; | |
423 | int err; | |
424 | ||
425 | tmp_bh.b_state = 0; | |
426 | err = affs_get_block(inode, block, &tmp_bh, create); | |
427 | if (!err) { | |
428 | bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr); | |
429 | if (bh) { | |
430 | bh->b_state |= tmp_bh.b_state; | |
431 | return bh; | |
432 | } | |
433 | err = -EIO; | |
434 | } | |
435 | return ERR_PTR(err); | |
436 | } | |
437 | ||
438 | static inline struct buffer_head * | |
439 | affs_getzeroblk_ino(struct inode *inode, int block) | |
440 | { | |
441 | struct buffer_head *bh, tmp_bh; | |
442 | int err; | |
443 | ||
444 | tmp_bh.b_state = 0; | |
445 | err = affs_get_block(inode, block, &tmp_bh, 1); | |
446 | if (!err) { | |
447 | bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr); | |
448 | if (bh) { | |
449 | bh->b_state |= tmp_bh.b_state; | |
450 | return bh; | |
451 | } | |
452 | err = -EIO; | |
453 | } | |
454 | return ERR_PTR(err); | |
455 | } | |
456 | ||
457 | static inline struct buffer_head * | |
458 | affs_getemptyblk_ino(struct inode *inode, int block) | |
459 | { | |
460 | struct buffer_head *bh, tmp_bh; | |
461 | int err; | |
462 | ||
463 | tmp_bh.b_state = 0; | |
464 | err = affs_get_block(inode, block, &tmp_bh, 1); | |
465 | if (!err) { | |
466 | bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr); | |
467 | if (bh) { | |
468 | bh->b_state |= tmp_bh.b_state; | |
469 | return bh; | |
470 | } | |
471 | err = -EIO; | |
472 | } | |
473 | return ERR_PTR(err); | |
474 | } | |
475 | ||
476 | static ssize_t | |
477 | affs_file_write(struct file *file, const char __user *buf, | |
478 | size_t count, loff_t *ppos) | |
479 | { | |
480 | ssize_t retval; | |
481 | ||
482 | retval = generic_file_write (file, buf, count, ppos); | |
483 | if (retval >0) { | |
484 | struct inode *inode = file->f_dentry->d_inode; | |
485 | inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
486 | mark_inode_dirty(inode); | |
487 | } | |
488 | return retval; | |
489 | } | |
490 | ||
491 | static int | |
492 | affs_do_readpage_ofs(struct file *file, struct page *page, unsigned from, unsigned to) | |
493 | { | |
494 | struct inode *inode = page->mapping->host; | |
495 | struct super_block *sb = inode->i_sb; | |
496 | struct buffer_head *bh; | |
497 | char *data; | |
498 | u32 bidx, boff, bsize; | |
499 | u32 tmp; | |
500 | ||
501 | pr_debug("AFFS: read_page(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to); | |
502 | if (from > to || to > PAGE_CACHE_SIZE) | |
503 | BUG(); | |
504 | kmap(page); | |
505 | data = page_address(page); | |
506 | bsize = AFFS_SB(sb)->s_data_blksize; | |
507 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
508 | bidx = tmp / bsize; | |
509 | boff = tmp % bsize; | |
510 | ||
511 | while (from < to) { | |
512 | bh = affs_bread_ino(inode, bidx, 0); | |
513 | if (IS_ERR(bh)) | |
514 | return PTR_ERR(bh); | |
515 | tmp = min(bsize - boff, to - from); | |
516 | if (from + tmp > to || tmp > bsize) | |
517 | BUG(); | |
518 | memcpy(data + from, AFFS_DATA(bh) + boff, tmp); | |
519 | affs_brelse(bh); | |
520 | bidx++; | |
521 | from += tmp; | |
522 | boff = 0; | |
523 | } | |
524 | flush_dcache_page(page); | |
525 | kunmap(page); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static int | |
530 | affs_extent_file_ofs(struct inode *inode, u32 newsize) | |
531 | { | |
532 | struct super_block *sb = inode->i_sb; | |
533 | struct buffer_head *bh, *prev_bh; | |
534 | u32 bidx, boff; | |
535 | u32 size, bsize; | |
536 | u32 tmp; | |
537 | ||
538 | pr_debug("AFFS: extent_file(%u, %d)\n", (u32)inode->i_ino, newsize); | |
539 | bsize = AFFS_SB(sb)->s_data_blksize; | |
540 | bh = NULL; | |
541 | size = AFFS_I(inode)->mmu_private; | |
542 | bidx = size / bsize; | |
543 | boff = size % bsize; | |
544 | if (boff) { | |
545 | bh = affs_bread_ino(inode, bidx, 0); | |
546 | if (IS_ERR(bh)) | |
547 | return PTR_ERR(bh); | |
548 | tmp = min(bsize - boff, newsize - size); | |
549 | if (boff + tmp > bsize || tmp > bsize) | |
550 | BUG(); | |
551 | memset(AFFS_DATA(bh) + boff, 0, tmp); | |
552 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(be32_to_cpu(AFFS_DATA_HEAD(bh)->size) + tmp); | |
553 | affs_fix_checksum(sb, bh); | |
554 | mark_buffer_dirty_inode(bh, inode); | |
555 | size += tmp; | |
556 | bidx++; | |
557 | } else if (bidx) { | |
558 | bh = affs_bread_ino(inode, bidx - 1, 0); | |
559 | if (IS_ERR(bh)) | |
560 | return PTR_ERR(bh); | |
561 | } | |
562 | ||
563 | while (size < newsize) { | |
564 | prev_bh = bh; | |
565 | bh = affs_getzeroblk_ino(inode, bidx); | |
566 | if (IS_ERR(bh)) | |
567 | goto out; | |
568 | tmp = min(bsize, newsize - size); | |
569 | if (tmp > bsize) | |
570 | BUG(); | |
571 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); | |
572 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
573 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
574 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
575 | affs_fix_checksum(sb, bh); | |
576 | bh->b_state &= ~(1UL << BH_New); | |
577 | mark_buffer_dirty_inode(bh, inode); | |
578 | if (prev_bh) { | |
579 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
580 | if (tmp) | |
581 | affs_warning(sb, "extent_file_ofs", "next block already set for %d (%d)", bidx, tmp); | |
582 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
583 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
584 | mark_buffer_dirty_inode(prev_bh, inode); | |
585 | affs_brelse(prev_bh); | |
586 | } | |
587 | size += bsize; | |
588 | bidx++; | |
589 | } | |
590 | affs_brelse(bh); | |
591 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; | |
592 | return 0; | |
593 | ||
594 | out: | |
595 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; | |
596 | return PTR_ERR(bh); | |
597 | } | |
598 | ||
599 | static int | |
600 | affs_readpage_ofs(struct file *file, struct page *page) | |
601 | { | |
602 | struct inode *inode = page->mapping->host; | |
603 | u32 to; | |
604 | int err; | |
605 | ||
606 | pr_debug("AFFS: read_page(%u, %ld)\n", (u32)inode->i_ino, page->index); | |
607 | to = PAGE_CACHE_SIZE; | |
608 | if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) { | |
609 | to = inode->i_size & ~PAGE_CACHE_MASK; | |
610 | memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to); | |
611 | } | |
612 | ||
613 | err = affs_do_readpage_ofs(file, page, 0, to); | |
614 | if (!err) | |
615 | SetPageUptodate(page); | |
616 | unlock_page(page); | |
617 | return err; | |
618 | } | |
619 | ||
620 | static int affs_prepare_write_ofs(struct file *file, struct page *page, unsigned from, unsigned to) | |
621 | { | |
622 | struct inode *inode = page->mapping->host; | |
623 | u32 size, offset; | |
624 | u32 tmp; | |
625 | int err = 0; | |
626 | ||
627 | pr_debug("AFFS: prepare_write(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to); | |
628 | offset = page->index << PAGE_CACHE_SHIFT; | |
629 | if (offset + from > AFFS_I(inode)->mmu_private) { | |
630 | err = affs_extent_file_ofs(inode, offset + from); | |
631 | if (err) | |
632 | return err; | |
633 | } | |
634 | size = inode->i_size; | |
635 | ||
636 | if (PageUptodate(page)) | |
637 | return 0; | |
638 | ||
639 | if (from) { | |
640 | err = affs_do_readpage_ofs(file, page, 0, from); | |
641 | if (err) | |
642 | return err; | |
643 | } | |
644 | if (to < PAGE_CACHE_SIZE) { | |
645 | char *kaddr = kmap_atomic(page, KM_USER0); | |
646 | ||
647 | memset(kaddr + to, 0, PAGE_CACHE_SIZE - to); | |
648 | flush_dcache_page(page); | |
649 | kunmap_atomic(kaddr, KM_USER0); | |
650 | if (size > offset + to) { | |
651 | if (size < offset + PAGE_CACHE_SIZE) | |
652 | tmp = size & ~PAGE_CACHE_MASK; | |
653 | else | |
654 | tmp = PAGE_CACHE_SIZE; | |
655 | err = affs_do_readpage_ofs(file, page, to, tmp); | |
656 | } | |
657 | } | |
658 | return err; | |
659 | } | |
660 | ||
661 | static int affs_commit_write_ofs(struct file *file, struct page *page, unsigned from, unsigned to) | |
662 | { | |
663 | struct inode *inode = page->mapping->host; | |
664 | struct super_block *sb = inode->i_sb; | |
665 | struct buffer_head *bh, *prev_bh; | |
666 | char *data; | |
667 | u32 bidx, boff, bsize; | |
668 | u32 tmp; | |
669 | int written; | |
670 | ||
671 | pr_debug("AFFS: commit_write(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to); | |
672 | bsize = AFFS_SB(sb)->s_data_blksize; | |
673 | data = page_address(page); | |
674 | ||
675 | bh = NULL; | |
676 | written = 0; | |
677 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
678 | bidx = tmp / bsize; | |
679 | boff = tmp % bsize; | |
680 | if (boff) { | |
681 | bh = affs_bread_ino(inode, bidx, 0); | |
682 | if (IS_ERR(bh)) | |
683 | return PTR_ERR(bh); | |
684 | tmp = min(bsize - boff, to - from); | |
685 | if (boff + tmp > bsize || tmp > bsize) | |
686 | BUG(); | |
687 | memcpy(AFFS_DATA(bh) + boff, data + from, tmp); | |
688 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(be32_to_cpu(AFFS_DATA_HEAD(bh)->size) + tmp); | |
689 | affs_fix_checksum(sb, bh); | |
690 | mark_buffer_dirty_inode(bh, inode); | |
691 | written += tmp; | |
692 | from += tmp; | |
693 | bidx++; | |
694 | } else if (bidx) { | |
695 | bh = affs_bread_ino(inode, bidx - 1, 0); | |
696 | if (IS_ERR(bh)) | |
697 | return PTR_ERR(bh); | |
698 | } | |
699 | while (from + bsize <= to) { | |
700 | prev_bh = bh; | |
701 | bh = affs_getemptyblk_ino(inode, bidx); | |
702 | if (IS_ERR(bh)) | |
703 | goto out; | |
704 | memcpy(AFFS_DATA(bh), data + from, bsize); | |
705 | if (buffer_new(bh)) { | |
706 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); | |
707 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
708 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
709 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize); | |
710 | AFFS_DATA_HEAD(bh)->next = 0; | |
711 | bh->b_state &= ~(1UL << BH_New); | |
712 | if (prev_bh) { | |
713 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
714 | if (tmp) | |
715 | affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp); | |
716 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
717 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
718 | mark_buffer_dirty_inode(prev_bh, inode); | |
719 | } | |
720 | } | |
721 | affs_brelse(prev_bh); | |
722 | affs_fix_checksum(sb, bh); | |
723 | mark_buffer_dirty_inode(bh, inode); | |
724 | written += bsize; | |
725 | from += bsize; | |
726 | bidx++; | |
727 | } | |
728 | if (from < to) { | |
729 | prev_bh = bh; | |
730 | bh = affs_bread_ino(inode, bidx, 1); | |
731 | if (IS_ERR(bh)) | |
732 | goto out; | |
733 | tmp = min(bsize, to - from); | |
734 | if (tmp > bsize) | |
735 | BUG(); | |
736 | memcpy(AFFS_DATA(bh), data + from, tmp); | |
737 | if (buffer_new(bh)) { | |
738 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); | |
739 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
740 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
741 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
742 | AFFS_DATA_HEAD(bh)->next = 0; | |
743 | bh->b_state &= ~(1UL << BH_New); | |
744 | if (prev_bh) { | |
745 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
746 | if (tmp) | |
747 | affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp); | |
748 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
749 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
750 | mark_buffer_dirty_inode(prev_bh, inode); | |
751 | } | |
752 | } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp) | |
753 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
754 | affs_brelse(prev_bh); | |
755 | affs_fix_checksum(sb, bh); | |
756 | mark_buffer_dirty_inode(bh, inode); | |
757 | written += tmp; | |
758 | from += tmp; | |
759 | bidx++; | |
760 | } | |
761 | SetPageUptodate(page); | |
762 | ||
763 | done: | |
764 | affs_brelse(bh); | |
765 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
766 | if (tmp > inode->i_size) | |
767 | inode->i_size = AFFS_I(inode)->mmu_private = tmp; | |
768 | ||
769 | return written; | |
770 | ||
771 | out: | |
772 | bh = prev_bh; | |
773 | if (!written) | |
774 | written = PTR_ERR(bh); | |
775 | goto done; | |
776 | } | |
777 | ||
778 | struct address_space_operations affs_aops_ofs = { | |
779 | .readpage = affs_readpage_ofs, | |
780 | //.writepage = affs_writepage_ofs, | |
781 | //.sync_page = affs_sync_page_ofs, | |
782 | .prepare_write = affs_prepare_write_ofs, | |
783 | .commit_write = affs_commit_write_ofs | |
784 | }; | |
785 | ||
786 | /* Free any preallocated blocks. */ | |
787 | ||
788 | void | |
789 | affs_free_prealloc(struct inode *inode) | |
790 | { | |
791 | struct super_block *sb = inode->i_sb; | |
792 | ||
793 | pr_debug("AFFS: free_prealloc(ino=%lu)\n", inode->i_ino); | |
794 | ||
795 | while (AFFS_I(inode)->i_pa_cnt) { | |
796 | AFFS_I(inode)->i_pa_cnt--; | |
797 | affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc); | |
798 | } | |
799 | } | |
800 | ||
801 | /* Truncate (or enlarge) a file to the requested size. */ | |
802 | ||
803 | void | |
804 | affs_truncate(struct inode *inode) | |
805 | { | |
806 | struct super_block *sb = inode->i_sb; | |
807 | u32 ext, ext_key; | |
808 | u32 last_blk, blkcnt, blk; | |
809 | u32 size; | |
810 | struct buffer_head *ext_bh; | |
811 | int i; | |
812 | ||
813 | pr_debug("AFFS: truncate(inode=%d, oldsize=%u, newsize=%u)\n", | |
814 | (u32)inode->i_ino, (u32)AFFS_I(inode)->mmu_private, (u32)inode->i_size); | |
815 | ||
816 | last_blk = 0; | |
817 | ext = 0; | |
818 | if (inode->i_size) { | |
819 | last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize; | |
820 | ext = last_blk / AFFS_SB(sb)->s_hashsize; | |
821 | } | |
822 | ||
823 | if (inode->i_size > AFFS_I(inode)->mmu_private) { | |
824 | struct address_space *mapping = inode->i_mapping; | |
825 | struct page *page; | |
826 | u32 size = inode->i_size - 1; | |
827 | int res; | |
828 | ||
829 | page = grab_cache_page(mapping, size >> PAGE_CACHE_SHIFT); | |
830 | if (!page) | |
831 | return; | |
832 | size = (size & (PAGE_CACHE_SIZE - 1)) + 1; | |
833 | res = mapping->a_ops->prepare_write(NULL, page, size, size); | |
834 | if (!res) | |
835 | res = mapping->a_ops->commit_write(NULL, page, size, size); | |
836 | unlock_page(page); | |
837 | page_cache_release(page); | |
838 | mark_inode_dirty(inode); | |
839 | return; | |
840 | } else if (inode->i_size == AFFS_I(inode)->mmu_private) | |
841 | return; | |
842 | ||
843 | // lock cache | |
844 | ext_bh = affs_get_extblock(inode, ext); | |
845 | if (IS_ERR(ext_bh)) { | |
846 | affs_warning(sb, "truncate", "unexpected read error for ext block %u (%d)", | |
847 | ext, PTR_ERR(ext_bh)); | |
848 | return; | |
849 | } | |
850 | if (AFFS_I(inode)->i_lc) { | |
851 | /* clear linear cache */ | |
852 | i = (ext + 1) >> AFFS_I(inode)->i_lc_shift; | |
853 | if (AFFS_I(inode)->i_lc_size > i) { | |
854 | AFFS_I(inode)->i_lc_size = i; | |
855 | for (; i < AFFS_LC_SIZE; i++) | |
856 | AFFS_I(inode)->i_lc[i] = 0; | |
857 | } | |
858 | /* clear associative cache */ | |
859 | for (i = 0; i < AFFS_AC_SIZE; i++) | |
860 | if (AFFS_I(inode)->i_ac[i].ext >= ext) | |
861 | AFFS_I(inode)->i_ac[i].ext = 0; | |
862 | } | |
863 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); | |
864 | ||
865 | blkcnt = AFFS_I(inode)->i_blkcnt; | |
866 | i = 0; | |
867 | blk = last_blk; | |
868 | if (inode->i_size) { | |
869 | i = last_blk % AFFS_SB(sb)->s_hashsize + 1; | |
870 | blk++; | |
871 | } else | |
872 | AFFS_HEAD(ext_bh)->first_data = 0; | |
873 | size = AFFS_SB(sb)->s_hashsize; | |
874 | if (size > blkcnt - blk + i) | |
875 | size = blkcnt - blk + i; | |
876 | for (; i < size; i++, blk++) { | |
877 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); | |
878 | AFFS_BLOCK(sb, ext_bh, i) = 0; | |
879 | } | |
880 | AFFS_TAIL(sb, ext_bh)->extension = 0; | |
881 | affs_fix_checksum(sb, ext_bh); | |
882 | mark_buffer_dirty_inode(ext_bh, inode); | |
883 | affs_brelse(ext_bh); | |
884 | ||
885 | if (inode->i_size) { | |
886 | AFFS_I(inode)->i_blkcnt = last_blk + 1; | |
887 | AFFS_I(inode)->i_extcnt = ext + 1; | |
888 | if (AFFS_SB(sb)->s_flags & SF_OFS) { | |
889 | struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0); | |
890 | u32 tmp; | |
891 | if (IS_ERR(ext_bh)) { | |
892 | affs_warning(sb, "truncate", "unexpected read error for last block %u (%d)", | |
893 | ext, PTR_ERR(ext_bh)); | |
894 | return; | |
895 | } | |
896 | tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next); | |
897 | AFFS_DATA_HEAD(bh)->next = 0; | |
898 | affs_adjust_checksum(bh, -tmp); | |
899 | affs_brelse(bh); | |
900 | } | |
901 | } else { | |
902 | AFFS_I(inode)->i_blkcnt = 0; | |
903 | AFFS_I(inode)->i_extcnt = 1; | |
904 | } | |
905 | AFFS_I(inode)->mmu_private = inode->i_size; | |
906 | // unlock cache | |
907 | ||
908 | while (ext_key) { | |
909 | ext_bh = affs_bread(sb, ext_key); | |
910 | size = AFFS_SB(sb)->s_hashsize; | |
911 | if (size > blkcnt - blk) | |
912 | size = blkcnt - blk; | |
913 | for (i = 0; i < size; i++, blk++) | |
914 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); | |
915 | affs_free_block(sb, ext_key); | |
916 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); | |
917 | affs_brelse(ext_bh); | |
918 | } | |
919 | affs_free_prealloc(inode); | |
920 | } |