]>
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); | |
1da177e4 LT |
25 | static int affs_file_open(struct inode *inode, struct file *filp); |
26 | static int affs_file_release(struct inode *inode, struct file *filp); | |
27 | ||
4b6f5d20 | 28 | const struct file_operations affs_file_operations = { |
1da177e4 | 29 | .llseek = generic_file_llseek, |
543ade1f BP |
30 | .read = do_sync_read, |
31 | .aio_read = generic_file_aio_read, | |
32 | .write = do_sync_write, | |
33 | .aio_write = generic_file_aio_write, | |
1da177e4 LT |
34 | .mmap = generic_file_mmap, |
35 | .open = affs_file_open, | |
36 | .release = affs_file_release, | |
c4758795 | 37 | .fsync = affs_file_fsync, |
5ffc4ef4 | 38 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
39 | }; |
40 | ||
754661f1 | 41 | const struct inode_operations affs_file_inode_operations = { |
1da177e4 LT |
42 | .setattr = affs_notify_change, |
43 | }; | |
44 | ||
45 | static int | |
46 | affs_file_open(struct inode *inode, struct file *filp) | |
47 | { | |
dca3c336 RZ |
48 | pr_debug("AFFS: open(%lu,%d)\n", |
49 | inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); | |
50 | atomic_inc(&AFFS_I(inode)->i_opencnt); | |
1da177e4 LT |
51 | return 0; |
52 | } | |
53 | ||
54 | static int | |
55 | affs_file_release(struct inode *inode, struct file *filp) | |
56 | { | |
dca3c336 RZ |
57 | pr_debug("AFFS: release(%lu, %d)\n", |
58 | inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); | |
59 | ||
60 | if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) { | |
61 | mutex_lock(&inode->i_mutex); | |
62 | if (inode->i_size != AFFS_I(inode)->mmu_private) | |
63 | affs_truncate(inode); | |
1da177e4 | 64 | affs_free_prealloc(inode); |
dca3c336 RZ |
65 | mutex_unlock(&inode->i_mutex); |
66 | } | |
1da177e4 LT |
67 | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static int | |
72 | affs_grow_extcache(struct inode *inode, u32 lc_idx) | |
73 | { | |
74 | struct super_block *sb = inode->i_sb; | |
75 | struct buffer_head *bh; | |
76 | u32 lc_max; | |
77 | int i, j, key; | |
78 | ||
79 | if (!AFFS_I(inode)->i_lc) { | |
80 | char *ptr = (char *)get_zeroed_page(GFP_NOFS); | |
81 | if (!ptr) | |
82 | return -ENOMEM; | |
83 | AFFS_I(inode)->i_lc = (u32 *)ptr; | |
84 | AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2); | |
85 | } | |
86 | ||
87 | lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift; | |
88 | ||
89 | if (AFFS_I(inode)->i_extcnt > lc_max) { | |
90 | u32 lc_shift, lc_mask, tmp, off; | |
91 | ||
92 | /* need to recalculate linear cache, start from old size */ | |
93 | lc_shift = AFFS_I(inode)->i_lc_shift; | |
94 | tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift; | |
95 | for (; tmp; tmp >>= 1) | |
96 | lc_shift++; | |
97 | lc_mask = (1 << lc_shift) - 1; | |
98 | ||
99 | /* fix idx and old size to new shift */ | |
100 | lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift); | |
101 | AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift); | |
102 | ||
103 | /* first shrink old cache to make more space */ | |
104 | off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift); | |
105 | for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off) | |
106 | AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j]; | |
107 | ||
108 | AFFS_I(inode)->i_lc_shift = lc_shift; | |
109 | AFFS_I(inode)->i_lc_mask = lc_mask; | |
110 | } | |
111 | ||
112 | /* fill cache to the needed index */ | |
113 | i = AFFS_I(inode)->i_lc_size; | |
114 | AFFS_I(inode)->i_lc_size = lc_idx + 1; | |
115 | for (; i <= lc_idx; i++) { | |
116 | if (!i) { | |
117 | AFFS_I(inode)->i_lc[0] = inode->i_ino; | |
118 | continue; | |
119 | } | |
120 | key = AFFS_I(inode)->i_lc[i - 1]; | |
121 | j = AFFS_I(inode)->i_lc_mask + 1; | |
122 | // unlock cache | |
123 | for (; j > 0; j--) { | |
124 | bh = affs_bread(sb, key); | |
125 | if (!bh) | |
126 | goto err; | |
127 | key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
128 | affs_brelse(bh); | |
129 | } | |
130 | // lock cache | |
131 | AFFS_I(inode)->i_lc[i] = key; | |
132 | } | |
133 | ||
134 | return 0; | |
135 | ||
136 | err: | |
137 | // lock cache | |
138 | return -EIO; | |
139 | } | |
140 | ||
141 | static struct buffer_head * | |
142 | affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext) | |
143 | { | |
144 | struct super_block *sb = inode->i_sb; | |
145 | struct buffer_head *new_bh; | |
146 | u32 blocknr, tmp; | |
147 | ||
148 | blocknr = affs_alloc_block(inode, bh->b_blocknr); | |
149 | if (!blocknr) | |
150 | return ERR_PTR(-ENOSPC); | |
151 | ||
152 | new_bh = affs_getzeroblk(sb, blocknr); | |
153 | if (!new_bh) { | |
154 | affs_free_block(sb, blocknr); | |
155 | return ERR_PTR(-EIO); | |
156 | } | |
157 | ||
158 | AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST); | |
159 | AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr); | |
160 | AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE); | |
161 | AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino); | |
162 | affs_fix_checksum(sb, new_bh); | |
163 | ||
164 | mark_buffer_dirty_inode(new_bh, inode); | |
165 | ||
166 | tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
167 | if (tmp) | |
168 | affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp); | |
169 | AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr); | |
170 | affs_adjust_checksum(bh, blocknr - tmp); | |
171 | mark_buffer_dirty_inode(bh, inode); | |
172 | ||
173 | AFFS_I(inode)->i_extcnt++; | |
174 | mark_inode_dirty(inode); | |
175 | ||
176 | return new_bh; | |
177 | } | |
178 | ||
179 | static inline struct buffer_head * | |
180 | affs_get_extblock(struct inode *inode, u32 ext) | |
181 | { | |
182 | /* inline the simplest case: same extended block as last time */ | |
183 | struct buffer_head *bh = AFFS_I(inode)->i_ext_bh; | |
184 | if (ext == AFFS_I(inode)->i_ext_last) | |
dca3c336 | 185 | get_bh(bh); |
1da177e4 LT |
186 | else |
187 | /* we have to do more (not inlined) */ | |
188 | bh = affs_get_extblock_slow(inode, ext); | |
189 | ||
190 | return bh; | |
191 | } | |
192 | ||
193 | static struct buffer_head * | |
194 | affs_get_extblock_slow(struct inode *inode, u32 ext) | |
195 | { | |
196 | struct super_block *sb = inode->i_sb; | |
197 | struct buffer_head *bh; | |
198 | u32 ext_key; | |
199 | u32 lc_idx, lc_off, ac_idx; | |
200 | u32 tmp, idx; | |
201 | ||
202 | if (ext == AFFS_I(inode)->i_ext_last + 1) { | |
203 | /* read the next extended block from the current one */ | |
204 | bh = AFFS_I(inode)->i_ext_bh; | |
205 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
206 | if (ext < AFFS_I(inode)->i_extcnt) | |
207 | goto read_ext; | |
208 | if (ext > AFFS_I(inode)->i_extcnt) | |
209 | BUG(); | |
210 | bh = affs_alloc_extblock(inode, bh, ext); | |
211 | if (IS_ERR(bh)) | |
212 | return bh; | |
213 | goto store_ext; | |
214 | } | |
215 | ||
216 | if (ext == 0) { | |
217 | /* we seek back to the file header block */ | |
218 | ext_key = inode->i_ino; | |
219 | goto read_ext; | |
220 | } | |
221 | ||
222 | if (ext >= AFFS_I(inode)->i_extcnt) { | |
223 | struct buffer_head *prev_bh; | |
224 | ||
225 | /* allocate a new extended block */ | |
226 | if (ext > AFFS_I(inode)->i_extcnt) | |
227 | BUG(); | |
228 | ||
229 | /* get previous extended block */ | |
230 | prev_bh = affs_get_extblock(inode, ext - 1); | |
231 | if (IS_ERR(prev_bh)) | |
232 | return prev_bh; | |
233 | bh = affs_alloc_extblock(inode, prev_bh, ext); | |
234 | affs_brelse(prev_bh); | |
235 | if (IS_ERR(bh)) | |
236 | return bh; | |
237 | goto store_ext; | |
238 | } | |
239 | ||
240 | again: | |
241 | /* check if there is an extended cache and whether it's large enough */ | |
242 | lc_idx = ext >> AFFS_I(inode)->i_lc_shift; | |
243 | lc_off = ext & AFFS_I(inode)->i_lc_mask; | |
244 | ||
245 | if (lc_idx >= AFFS_I(inode)->i_lc_size) { | |
246 | int err; | |
247 | ||
248 | err = affs_grow_extcache(inode, lc_idx); | |
249 | if (err) | |
250 | return ERR_PTR(err); | |
251 | goto again; | |
252 | } | |
253 | ||
254 | /* every n'th key we find in the linear cache */ | |
255 | if (!lc_off) { | |
256 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; | |
257 | goto read_ext; | |
258 | } | |
259 | ||
260 | /* maybe it's still in the associative cache */ | |
261 | ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK; | |
262 | if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) { | |
263 | ext_key = AFFS_I(inode)->i_ac[ac_idx].key; | |
264 | goto read_ext; | |
265 | } | |
266 | ||
267 | /* try to find one of the previous extended blocks */ | |
268 | tmp = ext; | |
269 | idx = ac_idx; | |
270 | while (--tmp, --lc_off > 0) { | |
271 | idx = (idx - 1) & AFFS_AC_MASK; | |
272 | if (AFFS_I(inode)->i_ac[idx].ext == tmp) { | |
273 | ext_key = AFFS_I(inode)->i_ac[idx].key; | |
274 | goto find_ext; | |
275 | } | |
276 | } | |
277 | ||
278 | /* fall back to the linear cache */ | |
279 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; | |
280 | find_ext: | |
281 | /* read all extended blocks until we find the one we need */ | |
282 | //unlock cache | |
283 | do { | |
284 | bh = affs_bread(sb, ext_key); | |
285 | if (!bh) | |
286 | goto err_bread; | |
287 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
288 | affs_brelse(bh); | |
289 | tmp++; | |
290 | } while (tmp < ext); | |
291 | //lock cache | |
292 | ||
293 | /* store it in the associative cache */ | |
294 | // recalculate ac_idx? | |
295 | AFFS_I(inode)->i_ac[ac_idx].ext = ext; | |
296 | AFFS_I(inode)->i_ac[ac_idx].key = ext_key; | |
297 | ||
298 | read_ext: | |
299 | /* finally read the right extended block */ | |
300 | //unlock cache | |
301 | bh = affs_bread(sb, ext_key); | |
302 | if (!bh) | |
303 | goto err_bread; | |
304 | //lock cache | |
305 | ||
306 | store_ext: | |
307 | /* release old cached extended block and store the new one */ | |
308 | affs_brelse(AFFS_I(inode)->i_ext_bh); | |
309 | AFFS_I(inode)->i_ext_last = ext; | |
310 | AFFS_I(inode)->i_ext_bh = bh; | |
dca3c336 | 311 | get_bh(bh); |
1da177e4 LT |
312 | |
313 | return bh; | |
314 | ||
315 | err_bread: | |
316 | affs_brelse(bh); | |
317 | return ERR_PTR(-EIO); | |
318 | } | |
319 | ||
320 | static int | |
321 | affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) | |
322 | { | |
323 | struct super_block *sb = inode->i_sb; | |
324 | struct buffer_head *ext_bh; | |
325 | u32 ext; | |
326 | ||
327 | pr_debug("AFFS: get_block(%u, %lu)\n", (u32)inode->i_ino, (unsigned long)block); | |
328 | ||
8d4b6900 | 329 | BUG_ON(block > (sector_t)0x7fffffffUL); |
1da177e4 LT |
330 | |
331 | if (block >= AFFS_I(inode)->i_blkcnt) { | |
332 | if (block > AFFS_I(inode)->i_blkcnt || !create) | |
333 | goto err_big; | |
334 | } else | |
335 | create = 0; | |
336 | ||
337 | //lock cache | |
338 | affs_lock_ext(inode); | |
339 | ||
340 | ext = (u32)block / AFFS_SB(sb)->s_hashsize; | |
341 | block -= ext * AFFS_SB(sb)->s_hashsize; | |
342 | ext_bh = affs_get_extblock(inode, ext); | |
343 | if (IS_ERR(ext_bh)) | |
344 | goto err_ext; | |
345 | map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block))); | |
346 | ||
347 | if (create) { | |
348 | u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr); | |
349 | if (!blocknr) | |
350 | goto err_alloc; | |
351 | set_buffer_new(bh_result); | |
352 | AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize; | |
353 | AFFS_I(inode)->i_blkcnt++; | |
354 | ||
355 | /* store new block */ | |
356 | if (bh_result->b_blocknr) | |
357 | affs_warning(sb, "get_block", "block already set (%x)", bh_result->b_blocknr); | |
358 | AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr); | |
359 | AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1); | |
360 | affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1); | |
361 | bh_result->b_blocknr = blocknr; | |
362 | ||
363 | if (!block) { | |
364 | /* insert first block into header block */ | |
365 | u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data); | |
366 | if (tmp) | |
367 | affs_warning(sb, "get_block", "first block already set (%d)", tmp); | |
368 | AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr); | |
369 | affs_adjust_checksum(ext_bh, blocknr - tmp); | |
370 | } | |
371 | } | |
372 | ||
373 | affs_brelse(ext_bh); | |
374 | //unlock cache | |
375 | affs_unlock_ext(inode); | |
376 | return 0; | |
377 | ||
378 | err_big: | |
379 | affs_error(inode->i_sb,"get_block","strange block request %d", block); | |
380 | return -EIO; | |
381 | err_ext: | |
382 | // unlock cache | |
383 | affs_unlock_ext(inode); | |
384 | return PTR_ERR(ext_bh); | |
385 | err_alloc: | |
386 | brelse(ext_bh); | |
387 | clear_buffer_mapped(bh_result); | |
388 | bh_result->b_bdev = NULL; | |
389 | // unlock cache | |
390 | affs_unlock_ext(inode); | |
391 | return -ENOSPC; | |
392 | } | |
393 | ||
394 | static int affs_writepage(struct page *page, struct writeback_control *wbc) | |
395 | { | |
396 | return block_write_full_page(page, affs_get_block, wbc); | |
397 | } | |
f2b6a16e | 398 | |
1da177e4 LT |
399 | static int affs_readpage(struct file *file, struct page *page) |
400 | { | |
401 | return block_read_full_page(page, affs_get_block); | |
402 | } | |
f2b6a16e | 403 | |
1dc1834f MS |
404 | static void affs_write_failed(struct address_space *mapping, loff_t to) |
405 | { | |
406 | struct inode *inode = mapping->host; | |
407 | ||
408 | if (to > inode->i_size) { | |
409 | truncate_pagecache(inode, to, inode->i_size); | |
410 | affs_truncate(inode); | |
411 | } | |
412 | } | |
413 | ||
f2b6a16e NP |
414 | static int affs_write_begin(struct file *file, struct address_space *mapping, |
415 | loff_t pos, unsigned len, unsigned flags, | |
416 | struct page **pagep, void **fsdata) | |
1da177e4 | 417 | { |
282dc178 CH |
418 | int ret; |
419 | ||
f2b6a16e | 420 | *pagep = NULL; |
282dc178 | 421 | ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
f2b6a16e NP |
422 | affs_get_block, |
423 | &AFFS_I(mapping->host)->mmu_private); | |
1dc1834f MS |
424 | if (unlikely(ret)) |
425 | affs_write_failed(mapping, pos + len); | |
282dc178 CH |
426 | |
427 | return ret; | |
1da177e4 | 428 | } |
f2b6a16e | 429 | |
1da177e4 LT |
430 | static sector_t _affs_bmap(struct address_space *mapping, sector_t block) |
431 | { | |
432 | return generic_block_bmap(mapping,block,affs_get_block); | |
433 | } | |
f2b6a16e | 434 | |
f5e54d6e | 435 | const struct address_space_operations affs_aops = { |
1da177e4 LT |
436 | .readpage = affs_readpage, |
437 | .writepage = affs_writepage, | |
f2b6a16e NP |
438 | .write_begin = affs_write_begin, |
439 | .write_end = generic_write_end, | |
1da177e4 LT |
440 | .bmap = _affs_bmap |
441 | }; | |
442 | ||
443 | static inline struct buffer_head * | |
444 | affs_bread_ino(struct inode *inode, int block, int create) | |
445 | { | |
446 | struct buffer_head *bh, tmp_bh; | |
447 | int err; | |
448 | ||
449 | tmp_bh.b_state = 0; | |
450 | err = affs_get_block(inode, block, &tmp_bh, create); | |
451 | if (!err) { | |
452 | bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr); | |
453 | if (bh) { | |
454 | bh->b_state |= tmp_bh.b_state; | |
455 | return bh; | |
456 | } | |
457 | err = -EIO; | |
458 | } | |
459 | return ERR_PTR(err); | |
460 | } | |
461 | ||
462 | static inline struct buffer_head * | |
463 | affs_getzeroblk_ino(struct inode *inode, int block) | |
464 | { | |
465 | struct buffer_head *bh, tmp_bh; | |
466 | int err; | |
467 | ||
468 | tmp_bh.b_state = 0; | |
469 | err = affs_get_block(inode, block, &tmp_bh, 1); | |
470 | if (!err) { | |
471 | bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr); | |
472 | if (bh) { | |
473 | bh->b_state |= tmp_bh.b_state; | |
474 | return bh; | |
475 | } | |
476 | err = -EIO; | |
477 | } | |
478 | return ERR_PTR(err); | |
479 | } | |
480 | ||
481 | static inline struct buffer_head * | |
482 | affs_getemptyblk_ino(struct inode *inode, int block) | |
483 | { | |
484 | struct buffer_head *bh, tmp_bh; | |
485 | int err; | |
486 | ||
487 | tmp_bh.b_state = 0; | |
488 | err = affs_get_block(inode, block, &tmp_bh, 1); | |
489 | if (!err) { | |
490 | bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr); | |
491 | if (bh) { | |
492 | bh->b_state |= tmp_bh.b_state; | |
493 | return bh; | |
494 | } | |
495 | err = -EIO; | |
496 | } | |
497 | return ERR_PTR(err); | |
498 | } | |
499 | ||
1da177e4 LT |
500 | static int |
501 | affs_do_readpage_ofs(struct file *file, struct page *page, unsigned from, unsigned to) | |
502 | { | |
503 | struct inode *inode = page->mapping->host; | |
504 | struct super_block *sb = inode->i_sb; | |
505 | struct buffer_head *bh; | |
506 | char *data; | |
507 | u32 bidx, boff, bsize; | |
508 | u32 tmp; | |
509 | ||
510 | pr_debug("AFFS: read_page(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to); | |
8d4b6900 | 511 | BUG_ON(from > to || to > PAGE_CACHE_SIZE); |
1da177e4 LT |
512 | kmap(page); |
513 | data = page_address(page); | |
514 | bsize = AFFS_SB(sb)->s_data_blksize; | |
515 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
516 | bidx = tmp / bsize; | |
517 | boff = tmp % bsize; | |
518 | ||
519 | while (from < to) { | |
520 | bh = affs_bread_ino(inode, bidx, 0); | |
521 | if (IS_ERR(bh)) | |
522 | return PTR_ERR(bh); | |
523 | tmp = min(bsize - boff, to - from); | |
8d4b6900 | 524 | BUG_ON(from + tmp > to || tmp > bsize); |
1da177e4 LT |
525 | memcpy(data + from, AFFS_DATA(bh) + boff, tmp); |
526 | affs_brelse(bh); | |
527 | bidx++; | |
528 | from += tmp; | |
529 | boff = 0; | |
530 | } | |
531 | flush_dcache_page(page); | |
532 | kunmap(page); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static int | |
537 | affs_extent_file_ofs(struct inode *inode, u32 newsize) | |
538 | { | |
539 | struct super_block *sb = inode->i_sb; | |
540 | struct buffer_head *bh, *prev_bh; | |
541 | u32 bidx, boff; | |
542 | u32 size, bsize; | |
543 | u32 tmp; | |
544 | ||
545 | pr_debug("AFFS: extent_file(%u, %d)\n", (u32)inode->i_ino, newsize); | |
546 | bsize = AFFS_SB(sb)->s_data_blksize; | |
547 | bh = NULL; | |
548 | size = AFFS_I(inode)->mmu_private; | |
549 | bidx = size / bsize; | |
550 | boff = size % bsize; | |
551 | if (boff) { | |
552 | bh = affs_bread_ino(inode, bidx, 0); | |
553 | if (IS_ERR(bh)) | |
554 | return PTR_ERR(bh); | |
555 | tmp = min(bsize - boff, newsize - size); | |
8d4b6900 | 556 | BUG_ON(boff + tmp > bsize || tmp > bsize); |
1da177e4 | 557 | memset(AFFS_DATA(bh) + boff, 0, tmp); |
6369a4ab | 558 | be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); |
1da177e4 LT |
559 | affs_fix_checksum(sb, bh); |
560 | mark_buffer_dirty_inode(bh, inode); | |
561 | size += tmp; | |
562 | bidx++; | |
563 | } else if (bidx) { | |
564 | bh = affs_bread_ino(inode, bidx - 1, 0); | |
565 | if (IS_ERR(bh)) | |
566 | return PTR_ERR(bh); | |
567 | } | |
568 | ||
569 | while (size < newsize) { | |
570 | prev_bh = bh; | |
571 | bh = affs_getzeroblk_ino(inode, bidx); | |
572 | if (IS_ERR(bh)) | |
573 | goto out; | |
574 | tmp = min(bsize, newsize - size); | |
8d4b6900 | 575 | BUG_ON(tmp > bsize); |
1da177e4 LT |
576 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); |
577 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
578 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
579 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
580 | affs_fix_checksum(sb, bh); | |
581 | bh->b_state &= ~(1UL << BH_New); | |
582 | mark_buffer_dirty_inode(bh, inode); | |
583 | if (prev_bh) { | |
584 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
585 | if (tmp) | |
586 | affs_warning(sb, "extent_file_ofs", "next block already set for %d (%d)", bidx, tmp); | |
587 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
588 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
589 | mark_buffer_dirty_inode(prev_bh, inode); | |
590 | affs_brelse(prev_bh); | |
591 | } | |
592 | size += bsize; | |
593 | bidx++; | |
594 | } | |
595 | affs_brelse(bh); | |
596 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; | |
597 | return 0; | |
598 | ||
599 | out: | |
600 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; | |
601 | return PTR_ERR(bh); | |
602 | } | |
603 | ||
604 | static int | |
605 | affs_readpage_ofs(struct file *file, struct page *page) | |
606 | { | |
607 | struct inode *inode = page->mapping->host; | |
608 | u32 to; | |
609 | int err; | |
610 | ||
611 | pr_debug("AFFS: read_page(%u, %ld)\n", (u32)inode->i_ino, page->index); | |
612 | to = PAGE_CACHE_SIZE; | |
613 | if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) { | |
614 | to = inode->i_size & ~PAGE_CACHE_MASK; | |
615 | memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to); | |
616 | } | |
617 | ||
618 | err = affs_do_readpage_ofs(file, page, 0, to); | |
619 | if (!err) | |
620 | SetPageUptodate(page); | |
621 | unlock_page(page); | |
622 | return err; | |
623 | } | |
624 | ||
f2b6a16e NP |
625 | static int affs_write_begin_ofs(struct file *file, struct address_space *mapping, |
626 | loff_t pos, unsigned len, unsigned flags, | |
627 | struct page **pagep, void **fsdata) | |
1da177e4 | 628 | { |
f2b6a16e NP |
629 | struct inode *inode = mapping->host; |
630 | struct page *page; | |
631 | pgoff_t index; | |
1da177e4 LT |
632 | int err = 0; |
633 | ||
f2b6a16e NP |
634 | pr_debug("AFFS: write_begin(%u, %llu, %llu)\n", (u32)inode->i_ino, (unsigned long long)pos, (unsigned long long)pos + len); |
635 | if (pos > AFFS_I(inode)->mmu_private) { | |
636 | /* XXX: this probably leaves a too-big i_size in case of | |
637 | * failure. Should really be updating i_size at write_end time | |
638 | */ | |
639 | err = affs_extent_file_ofs(inode, pos); | |
1da177e4 LT |
640 | if (err) |
641 | return err; | |
642 | } | |
f2b6a16e NP |
643 | |
644 | index = pos >> PAGE_CACHE_SHIFT; | |
54566b2c | 645 | page = grab_cache_page_write_begin(mapping, index, flags); |
f2b6a16e NP |
646 | if (!page) |
647 | return -ENOMEM; | |
648 | *pagep = page; | |
1da177e4 LT |
649 | |
650 | if (PageUptodate(page)) | |
651 | return 0; | |
652 | ||
f2b6a16e NP |
653 | /* XXX: inefficient but safe in the face of short writes */ |
654 | err = affs_do_readpage_ofs(file, page, 0, PAGE_CACHE_SIZE); | |
655 | if (err) { | |
656 | unlock_page(page); | |
657 | page_cache_release(page); | |
1da177e4 LT |
658 | } |
659 | return err; | |
660 | } | |
661 | ||
f2b6a16e NP |
662 | static int affs_write_end_ofs(struct file *file, struct address_space *mapping, |
663 | loff_t pos, unsigned len, unsigned copied, | |
664 | struct page *page, void *fsdata) | |
1da177e4 | 665 | { |
f2b6a16e | 666 | struct inode *inode = mapping->host; |
1da177e4 LT |
667 | struct super_block *sb = inode->i_sb; |
668 | struct buffer_head *bh, *prev_bh; | |
669 | char *data; | |
670 | u32 bidx, boff, bsize; | |
f2b6a16e | 671 | unsigned from, to; |
1da177e4 LT |
672 | u32 tmp; |
673 | int written; | |
674 | ||
f2b6a16e NP |
675 | from = pos & (PAGE_CACHE_SIZE - 1); |
676 | to = pos + len; | |
677 | /* | |
678 | * XXX: not sure if this can handle short copies (len < copied), but | |
679 | * we don't have to, because the page should always be uptodate here, | |
680 | * due to write_begin. | |
681 | */ | |
682 | ||
683 | pr_debug("AFFS: write_begin(%u, %llu, %llu)\n", (u32)inode->i_ino, (unsigned long long)pos, (unsigned long long)pos + len); | |
1da177e4 LT |
684 | bsize = AFFS_SB(sb)->s_data_blksize; |
685 | data = page_address(page); | |
686 | ||
687 | bh = NULL; | |
688 | written = 0; | |
689 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
690 | bidx = tmp / bsize; | |
691 | boff = tmp % bsize; | |
692 | if (boff) { | |
693 | bh = affs_bread_ino(inode, bidx, 0); | |
694 | if (IS_ERR(bh)) | |
695 | return PTR_ERR(bh); | |
696 | tmp = min(bsize - boff, to - from); | |
8d4b6900 | 697 | BUG_ON(boff + tmp > bsize || tmp > bsize); |
1da177e4 | 698 | memcpy(AFFS_DATA(bh) + boff, data + from, tmp); |
6369a4ab | 699 | be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); |
1da177e4 LT |
700 | affs_fix_checksum(sb, bh); |
701 | mark_buffer_dirty_inode(bh, inode); | |
702 | written += tmp; | |
703 | from += tmp; | |
704 | bidx++; | |
705 | } else if (bidx) { | |
706 | bh = affs_bread_ino(inode, bidx - 1, 0); | |
707 | if (IS_ERR(bh)) | |
708 | return PTR_ERR(bh); | |
709 | } | |
710 | while (from + bsize <= to) { | |
711 | prev_bh = bh; | |
712 | bh = affs_getemptyblk_ino(inode, bidx); | |
713 | if (IS_ERR(bh)) | |
714 | goto out; | |
715 | memcpy(AFFS_DATA(bh), data + from, bsize); | |
716 | if (buffer_new(bh)) { | |
717 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); | |
718 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
719 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
720 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize); | |
721 | AFFS_DATA_HEAD(bh)->next = 0; | |
722 | bh->b_state &= ~(1UL << BH_New); | |
723 | if (prev_bh) { | |
724 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
725 | if (tmp) | |
726 | affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp); | |
727 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
728 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
729 | mark_buffer_dirty_inode(prev_bh, inode); | |
730 | } | |
731 | } | |
732 | affs_brelse(prev_bh); | |
733 | affs_fix_checksum(sb, bh); | |
734 | mark_buffer_dirty_inode(bh, inode); | |
735 | written += bsize; | |
736 | from += bsize; | |
737 | bidx++; | |
738 | } | |
739 | if (from < to) { | |
740 | prev_bh = bh; | |
741 | bh = affs_bread_ino(inode, bidx, 1); | |
742 | if (IS_ERR(bh)) | |
743 | goto out; | |
744 | tmp = min(bsize, to - from); | |
8d4b6900 | 745 | BUG_ON(tmp > bsize); |
1da177e4 LT |
746 | memcpy(AFFS_DATA(bh), data + from, tmp); |
747 | if (buffer_new(bh)) { | |
748 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); | |
749 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
750 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
751 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
752 | AFFS_DATA_HEAD(bh)->next = 0; | |
753 | bh->b_state &= ~(1UL << BH_New); | |
754 | if (prev_bh) { | |
755 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
756 | if (tmp) | |
757 | affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp); | |
758 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
759 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
760 | mark_buffer_dirty_inode(prev_bh, inode); | |
761 | } | |
762 | } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp) | |
763 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
764 | affs_brelse(prev_bh); | |
765 | affs_fix_checksum(sb, bh); | |
766 | mark_buffer_dirty_inode(bh, inode); | |
767 | written += tmp; | |
768 | from += tmp; | |
769 | bidx++; | |
770 | } | |
771 | SetPageUptodate(page); | |
772 | ||
773 | done: | |
774 | affs_brelse(bh); | |
775 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
776 | if (tmp > inode->i_size) | |
777 | inode->i_size = AFFS_I(inode)->mmu_private = tmp; | |
778 | ||
f2b6a16e NP |
779 | unlock_page(page); |
780 | page_cache_release(page); | |
781 | ||
1da177e4 LT |
782 | return written; |
783 | ||
784 | out: | |
785 | bh = prev_bh; | |
786 | if (!written) | |
787 | written = PTR_ERR(bh); | |
788 | goto done; | |
789 | } | |
790 | ||
f5e54d6e | 791 | const struct address_space_operations affs_aops_ofs = { |
1da177e4 LT |
792 | .readpage = affs_readpage_ofs, |
793 | //.writepage = affs_writepage_ofs, | |
f2b6a16e NP |
794 | .write_begin = affs_write_begin_ofs, |
795 | .write_end = affs_write_end_ofs | |
1da177e4 LT |
796 | }; |
797 | ||
798 | /* Free any preallocated blocks. */ | |
799 | ||
800 | void | |
801 | affs_free_prealloc(struct inode *inode) | |
802 | { | |
803 | struct super_block *sb = inode->i_sb; | |
804 | ||
805 | pr_debug("AFFS: free_prealloc(ino=%lu)\n", inode->i_ino); | |
806 | ||
807 | while (AFFS_I(inode)->i_pa_cnt) { | |
808 | AFFS_I(inode)->i_pa_cnt--; | |
809 | affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc); | |
810 | } | |
811 | } | |
812 | ||
813 | /* Truncate (or enlarge) a file to the requested size. */ | |
814 | ||
815 | void | |
816 | affs_truncate(struct inode *inode) | |
817 | { | |
818 | struct super_block *sb = inode->i_sb; | |
819 | u32 ext, ext_key; | |
820 | u32 last_blk, blkcnt, blk; | |
821 | u32 size; | |
822 | struct buffer_head *ext_bh; | |
823 | int i; | |
824 | ||
825 | pr_debug("AFFS: truncate(inode=%d, oldsize=%u, newsize=%u)\n", | |
826 | (u32)inode->i_ino, (u32)AFFS_I(inode)->mmu_private, (u32)inode->i_size); | |
827 | ||
828 | last_blk = 0; | |
829 | ext = 0; | |
830 | if (inode->i_size) { | |
831 | last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize; | |
832 | ext = last_blk / AFFS_SB(sb)->s_hashsize; | |
833 | } | |
834 | ||
835 | if (inode->i_size > AFFS_I(inode)->mmu_private) { | |
836 | struct address_space *mapping = inode->i_mapping; | |
837 | struct page *page; | |
f2b6a16e NP |
838 | void *fsdata; |
839 | u32 size = inode->i_size; | |
1da177e4 LT |
840 | int res; |
841 | ||
f2b6a16e | 842 | res = mapping->a_ops->write_begin(NULL, mapping, size, 0, 0, &page, &fsdata); |
1da177e4 | 843 | if (!res) |
f2b6a16e | 844 | res = mapping->a_ops->write_end(NULL, mapping, size, 0, 0, page, fsdata); |
dca3c336 RZ |
845 | else |
846 | inode->i_size = AFFS_I(inode)->mmu_private; | |
1da177e4 LT |
847 | mark_inode_dirty(inode); |
848 | return; | |
849 | } else if (inode->i_size == AFFS_I(inode)->mmu_private) | |
850 | return; | |
851 | ||
852 | // lock cache | |
853 | ext_bh = affs_get_extblock(inode, ext); | |
854 | if (IS_ERR(ext_bh)) { | |
855 | affs_warning(sb, "truncate", "unexpected read error for ext block %u (%d)", | |
856 | ext, PTR_ERR(ext_bh)); | |
857 | return; | |
858 | } | |
859 | if (AFFS_I(inode)->i_lc) { | |
860 | /* clear linear cache */ | |
861 | i = (ext + 1) >> AFFS_I(inode)->i_lc_shift; | |
862 | if (AFFS_I(inode)->i_lc_size > i) { | |
863 | AFFS_I(inode)->i_lc_size = i; | |
864 | for (; i < AFFS_LC_SIZE; i++) | |
865 | AFFS_I(inode)->i_lc[i] = 0; | |
866 | } | |
867 | /* clear associative cache */ | |
868 | for (i = 0; i < AFFS_AC_SIZE; i++) | |
869 | if (AFFS_I(inode)->i_ac[i].ext >= ext) | |
870 | AFFS_I(inode)->i_ac[i].ext = 0; | |
871 | } | |
872 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); | |
873 | ||
874 | blkcnt = AFFS_I(inode)->i_blkcnt; | |
875 | i = 0; | |
876 | blk = last_blk; | |
877 | if (inode->i_size) { | |
878 | i = last_blk % AFFS_SB(sb)->s_hashsize + 1; | |
879 | blk++; | |
880 | } else | |
881 | AFFS_HEAD(ext_bh)->first_data = 0; | |
dca3c336 | 882 | AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i); |
1da177e4 LT |
883 | size = AFFS_SB(sb)->s_hashsize; |
884 | if (size > blkcnt - blk + i) | |
885 | size = blkcnt - blk + i; | |
886 | for (; i < size; i++, blk++) { | |
887 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); | |
888 | AFFS_BLOCK(sb, ext_bh, i) = 0; | |
889 | } | |
890 | AFFS_TAIL(sb, ext_bh)->extension = 0; | |
891 | affs_fix_checksum(sb, ext_bh); | |
892 | mark_buffer_dirty_inode(ext_bh, inode); | |
893 | affs_brelse(ext_bh); | |
894 | ||
895 | if (inode->i_size) { | |
896 | AFFS_I(inode)->i_blkcnt = last_blk + 1; | |
897 | AFFS_I(inode)->i_extcnt = ext + 1; | |
898 | if (AFFS_SB(sb)->s_flags & SF_OFS) { | |
899 | struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0); | |
900 | u32 tmp; | |
0e45b67d | 901 | if (IS_ERR(bh)) { |
1da177e4 | 902 | affs_warning(sb, "truncate", "unexpected read error for last block %u (%d)", |
0e45b67d | 903 | ext, PTR_ERR(bh)); |
1da177e4 LT |
904 | return; |
905 | } | |
906 | tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next); | |
907 | AFFS_DATA_HEAD(bh)->next = 0; | |
908 | affs_adjust_checksum(bh, -tmp); | |
909 | affs_brelse(bh); | |
910 | } | |
911 | } else { | |
912 | AFFS_I(inode)->i_blkcnt = 0; | |
913 | AFFS_I(inode)->i_extcnt = 1; | |
914 | } | |
915 | AFFS_I(inode)->mmu_private = inode->i_size; | |
916 | // unlock cache | |
917 | ||
918 | while (ext_key) { | |
919 | ext_bh = affs_bread(sb, ext_key); | |
920 | size = AFFS_SB(sb)->s_hashsize; | |
921 | if (size > blkcnt - blk) | |
922 | size = blkcnt - blk; | |
923 | for (i = 0; i < size; i++, blk++) | |
924 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); | |
925 | affs_free_block(sb, ext_key); | |
926 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); | |
927 | affs_brelse(ext_bh); | |
928 | } | |
929 | affs_free_prealloc(inode); | |
930 | } | |
c4758795 | 931 | |
02c24a82 | 932 | int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
c4758795 | 933 | { |
7ea80859 | 934 | struct inode *inode = filp->f_mapping->host; |
c4758795 AV |
935 | int ret, err; |
936 | ||
02c24a82 JB |
937 | err = filemap_write_and_wait_range(inode->i_mapping, start, end); |
938 | if (err) | |
939 | return err; | |
940 | ||
941 | mutex_lock(&inode->i_mutex); | |
c4758795 AV |
942 | ret = write_inode_now(inode, 0); |
943 | err = sync_blockdev(inode->i_sb->s_bdev); | |
944 | if (!ret) | |
945 | ret = err; | |
02c24a82 | 946 | mutex_unlock(&inode->i_mutex); |
c4758795 AV |
947 | return ret; |
948 | } |