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16#include <linux/uio.h>
17#include <linux/blkdev.h>
18#include "affs.h"
19
20static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
21
22static int
23affs_file_open(struct inode *inode, struct file *filp)
24{
25 pr_debug("open(%lu,%d)\n",
26 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
27 atomic_inc(&AFFS_I(inode)->i_opencnt);
28 return 0;
29}
30
31static int
32affs_file_release(struct inode *inode, struct file *filp)
33{
34 pr_debug("release(%lu, %d)\n",
35 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
36
37 if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) {
38 inode_lock(inode);
39 if (inode->i_size != AFFS_I(inode)->mmu_private)
40 affs_truncate(inode);
41 affs_free_prealloc(inode);
42 inode_unlock(inode);
43 }
44
45 return 0;
46}
47
48static int
49affs_grow_extcache(struct inode *inode, u32 lc_idx)
50{
51 struct super_block *sb = inode->i_sb;
52 struct buffer_head *bh;
53 u32 lc_max;
54 int i, j, key;
55
56 if (!AFFS_I(inode)->i_lc) {
57 char *ptr = (char *)get_zeroed_page(GFP_NOFS);
58 if (!ptr)
59 return -ENOMEM;
60 AFFS_I(inode)->i_lc = (u32 *)ptr;
61 AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2);
62 }
63
64 lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift;
65
66 if (AFFS_I(inode)->i_extcnt > lc_max) {
67 u32 lc_shift, lc_mask, tmp, off;
68
69
70 lc_shift = AFFS_I(inode)->i_lc_shift;
71 tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift;
72 for (; tmp; tmp >>= 1)
73 lc_shift++;
74 lc_mask = (1 << lc_shift) - 1;
75
76
77 lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
78 AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
79
80
81 off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift);
82 for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off)
83 AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j];
84
85 AFFS_I(inode)->i_lc_shift = lc_shift;
86 AFFS_I(inode)->i_lc_mask = lc_mask;
87 }
88
89
90 i = AFFS_I(inode)->i_lc_size;
91 AFFS_I(inode)->i_lc_size = lc_idx + 1;
92 for (; i <= lc_idx; i++) {
93 if (!i) {
94 AFFS_I(inode)->i_lc[0] = inode->i_ino;
95 continue;
96 }
97 key = AFFS_I(inode)->i_lc[i - 1];
98 j = AFFS_I(inode)->i_lc_mask + 1;
99
100 for (; j > 0; j--) {
101 bh = affs_bread(sb, key);
102 if (!bh)
103 goto err;
104 key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
105 affs_brelse(bh);
106 }
107
108 AFFS_I(inode)->i_lc[i] = key;
109 }
110
111 return 0;
112
113err:
114
115 return -EIO;
116}
117
118static struct buffer_head *
119affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext)
120{
121 struct super_block *sb = inode->i_sb;
122 struct buffer_head *new_bh;
123 u32 blocknr, tmp;
124
125 blocknr = affs_alloc_block(inode, bh->b_blocknr);
126 if (!blocknr)
127 return ERR_PTR(-ENOSPC);
128
129 new_bh = affs_getzeroblk(sb, blocknr);
130 if (!new_bh) {
131 affs_free_block(sb, blocknr);
132 return ERR_PTR(-EIO);
133 }
134
135 AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST);
136 AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr);
137 AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE);
138 AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino);
139 affs_fix_checksum(sb, new_bh);
140
141 mark_buffer_dirty_inode(new_bh, inode);
142
143 tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
144 if (tmp)
145 affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp);
146 AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr);
147 affs_adjust_checksum(bh, blocknr - tmp);
148 mark_buffer_dirty_inode(bh, inode);
149
150 AFFS_I(inode)->i_extcnt++;
151 mark_inode_dirty(inode);
152
153 return new_bh;
154}
155
156static inline struct buffer_head *
157affs_get_extblock(struct inode *inode, u32 ext)
158{
159
160 struct buffer_head *bh = AFFS_I(inode)->i_ext_bh;
161 if (ext == AFFS_I(inode)->i_ext_last)
162 get_bh(bh);
163 else
164
165 bh = affs_get_extblock_slow(inode, ext);
166
167 return bh;
168}
169
170static struct buffer_head *
171affs_get_extblock_slow(struct inode *inode, u32 ext)
172{
173 struct super_block *sb = inode->i_sb;
174 struct buffer_head *bh;
175 u32 ext_key;
176 u32 lc_idx, lc_off, ac_idx;
177 u32 tmp, idx;
178
179 if (ext == AFFS_I(inode)->i_ext_last + 1) {
180
181 bh = AFFS_I(inode)->i_ext_bh;
182 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
183 if (ext < AFFS_I(inode)->i_extcnt)
184 goto read_ext;
185 BUG_ON(ext > AFFS_I(inode)->i_extcnt);
186 bh = affs_alloc_extblock(inode, bh, ext);
187 if (IS_ERR(bh))
188 return bh;
189 goto store_ext;
190 }
191
192 if (ext == 0) {
193
194 ext_key = inode->i_ino;
195 goto read_ext;
196 }
197
198 if (ext >= AFFS_I(inode)->i_extcnt) {
199 struct buffer_head *prev_bh;
200
201
202 BUG_ON(ext > AFFS_I(inode)->i_extcnt);
203
204
205 prev_bh = affs_get_extblock(inode, ext - 1);
206 if (IS_ERR(prev_bh))
207 return prev_bh;
208 bh = affs_alloc_extblock(inode, prev_bh, ext);
209 affs_brelse(prev_bh);
210 if (IS_ERR(bh))
211 return bh;
212 goto store_ext;
213 }
214
215again:
216
217 lc_idx = ext >> AFFS_I(inode)->i_lc_shift;
218 lc_off = ext & AFFS_I(inode)->i_lc_mask;
219
220 if (lc_idx >= AFFS_I(inode)->i_lc_size) {
221 int err;
222
223 err = affs_grow_extcache(inode, lc_idx);
224 if (err)
225 return ERR_PTR(err);
226 goto again;
227 }
228
229
230 if (!lc_off) {
231 ext_key = AFFS_I(inode)->i_lc[lc_idx];
232 goto read_ext;
233 }
234
235
236 ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK;
237 if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) {
238 ext_key = AFFS_I(inode)->i_ac[ac_idx].key;
239 goto read_ext;
240 }
241
242
243 tmp = ext;
244 idx = ac_idx;
245 while (--tmp, --lc_off > 0) {
246 idx = (idx - 1) & AFFS_AC_MASK;
247 if (AFFS_I(inode)->i_ac[idx].ext == tmp) {
248 ext_key = AFFS_I(inode)->i_ac[idx].key;
249 goto find_ext;
250 }
251 }
252
253
254 ext_key = AFFS_I(inode)->i_lc[lc_idx];
255find_ext:
256
257
258 do {
259 bh = affs_bread(sb, ext_key);
260 if (!bh)
261 goto err_bread;
262 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
263 affs_brelse(bh);
264 tmp++;
265 } while (tmp < ext);
266
267
268
269
270 AFFS_I(inode)->i_ac[ac_idx].ext = ext;
271 AFFS_I(inode)->i_ac[ac_idx].key = ext_key;
272
273read_ext:
274
275
276 bh = affs_bread(sb, ext_key);
277 if (!bh)
278 goto err_bread;
279
280
281store_ext:
282
283 affs_brelse(AFFS_I(inode)->i_ext_bh);
284 AFFS_I(inode)->i_ext_last = ext;
285 AFFS_I(inode)->i_ext_bh = bh;
286 get_bh(bh);
287
288 return bh;
289
290err_bread:
291 affs_brelse(bh);
292 return ERR_PTR(-EIO);
293}
294
295static int
296affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
297{
298 struct super_block *sb = inode->i_sb;
299 struct buffer_head *ext_bh;
300 u32 ext;
301
302 pr_debug("%s(%lu, %llu)\n", __func__, inode->i_ino,
303 (unsigned long long)block);
304
305 BUG_ON(block > (sector_t)0x7fffffffUL);
306
307 if (block >= AFFS_I(inode)->i_blkcnt) {
308 if (block > AFFS_I(inode)->i_blkcnt || !create)
309 goto err_big;
310 } else
311 create = 0;
312
313
314 affs_lock_ext(inode);
315
316 ext = (u32)block / AFFS_SB(sb)->s_hashsize;
317 block -= ext * AFFS_SB(sb)->s_hashsize;
318 ext_bh = affs_get_extblock(inode, ext);
319 if (IS_ERR(ext_bh))
320 goto err_ext;
321 map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block)));
322
323 if (create) {
324 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
325 if (!blocknr)
326 goto err_alloc;
327 set_buffer_new(bh_result);
328 AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize;
329 AFFS_I(inode)->i_blkcnt++;
330
331
332 if (bh_result->b_blocknr)
333 affs_warning(sb, "get_block",
334 "block already set (%llx)",
335 (unsigned long long)bh_result->b_blocknr);
336 AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr);
337 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1);
338 affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1);
339 bh_result->b_blocknr = blocknr;
340
341 if (!block) {
342
343 u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data);
344 if (tmp)
345 affs_warning(sb, "get_block", "first block already set (%d)", tmp);
346 AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr);
347 affs_adjust_checksum(ext_bh, blocknr - tmp);
348 }
349 }
350
351 affs_brelse(ext_bh);
352
353 affs_unlock_ext(inode);
354 return 0;
355
356err_big:
357 affs_error(inode->i_sb, "get_block", "strange block request %llu",
358 (unsigned long long)block);
359 return -EIO;
360err_ext:
361
362 affs_unlock_ext(inode);
363 return PTR_ERR(ext_bh);
364err_alloc:
365 brelse(ext_bh);
366 clear_buffer_mapped(bh_result);
367 bh_result->b_bdev = NULL;
368
369 affs_unlock_ext(inode);
370 return -ENOSPC;
371}
372
373static int affs_writepage(struct page *page, struct writeback_control *wbc)
374{
375 return block_write_full_page(page, affs_get_block, wbc);
376}
377
378static int affs_readpage(struct file *file, struct page *page)
379{
380 return block_read_full_page(page, affs_get_block);
381}
382
383static void affs_write_failed(struct address_space *mapping, loff_t to)
384{
385 struct inode *inode = mapping->host;
386
387 if (to > inode->i_size) {
388 truncate_pagecache(inode, inode->i_size);
389 affs_truncate(inode);
390 }
391}
392
393static ssize_t
394affs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
395{
396 struct file *file = iocb->ki_filp;
397 struct address_space *mapping = file->f_mapping;
398 struct inode *inode = mapping->host;
399 size_t count = iov_iter_count(iter);
400 loff_t offset = iocb->ki_pos;
401 ssize_t ret;
402
403 if (iov_iter_rw(iter) == WRITE) {
404 loff_t size = offset + count;
405
406 if (AFFS_I(inode)->mmu_private < size)
407 return 0;
408 }
409
410 ret = blockdev_direct_IO(iocb, inode, iter, affs_get_block);
411 if (ret < 0 && iov_iter_rw(iter) == WRITE)
412 affs_write_failed(mapping, offset + count);
413 return ret;
414}
415
416static int affs_write_begin(struct file *file, struct address_space *mapping,
417 loff_t pos, unsigned len, unsigned flags,
418 struct page **pagep, void **fsdata)
419{
420 int ret;
421
422 *pagep = NULL;
423 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
424 affs_get_block,
425 &AFFS_I(mapping->host)->mmu_private);
426 if (unlikely(ret))
427 affs_write_failed(mapping, pos + len);
428
429 return ret;
430}
431
432static int affs_write_end(struct file *file, struct address_space *mapping,
433 loff_t pos, unsigned int len, unsigned int copied,
434 struct page *page, void *fsdata)
435{
436 struct inode *inode = mapping->host;
437 int ret;
438
439 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
440
441
442 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
443 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
444 mark_inode_dirty(inode);
445 }
446
447 return ret;
448}
449
450static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
451{
452 return generic_block_bmap(mapping,block,affs_get_block);
453}
454
455const struct address_space_operations affs_aops = {
456 .set_page_dirty = __set_page_dirty_buffers,
457 .readpage = affs_readpage,
458 .writepage = affs_writepage,
459 .write_begin = affs_write_begin,
460 .write_end = affs_write_end,
461 .direct_IO = affs_direct_IO,
462 .bmap = _affs_bmap
463};
464
465static inline struct buffer_head *
466affs_bread_ino(struct inode *inode, int block, int create)
467{
468 struct buffer_head *bh, tmp_bh;
469 int err;
470
471 tmp_bh.b_state = 0;
472 err = affs_get_block(inode, block, &tmp_bh, create);
473 if (!err) {
474 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
475 if (bh) {
476 bh->b_state |= tmp_bh.b_state;
477 return bh;
478 }
479 err = -EIO;
480 }
481 return ERR_PTR(err);
482}
483
484static inline struct buffer_head *
485affs_getzeroblk_ino(struct inode *inode, int block)
486{
487 struct buffer_head *bh, tmp_bh;
488 int err;
489
490 tmp_bh.b_state = 0;
491 err = affs_get_block(inode, block, &tmp_bh, 1);
492 if (!err) {
493 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
494 if (bh) {
495 bh->b_state |= tmp_bh.b_state;
496 return bh;
497 }
498 err = -EIO;
499 }
500 return ERR_PTR(err);
501}
502
503static inline struct buffer_head *
504affs_getemptyblk_ino(struct inode *inode, int block)
505{
506 struct buffer_head *bh, tmp_bh;
507 int err;
508
509 tmp_bh.b_state = 0;
510 err = affs_get_block(inode, block, &tmp_bh, 1);
511 if (!err) {
512 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
513 if (bh) {
514 bh->b_state |= tmp_bh.b_state;
515 return bh;
516 }
517 err = -EIO;
518 }
519 return ERR_PTR(err);
520}
521
522static int
523affs_do_readpage_ofs(struct page *page, unsigned to, int create)
524{
525 struct inode *inode = page->mapping->host;
526 struct super_block *sb = inode->i_sb;
527 struct buffer_head *bh;
528 char *data;
529 unsigned pos = 0;
530 u32 bidx, boff, bsize;
531 u32 tmp;
532
533 pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino,
534 page->index, to);
535 BUG_ON(to > PAGE_SIZE);
536 bsize = AFFS_SB(sb)->s_data_blksize;
537 tmp = page->index << PAGE_SHIFT;
538 bidx = tmp / bsize;
539 boff = tmp % bsize;
540
541 while (pos < to) {
542 bh = affs_bread_ino(inode, bidx, create);
543 if (IS_ERR(bh))
544 return PTR_ERR(bh);
545 tmp = min(bsize - boff, to - pos);
546 BUG_ON(pos + tmp > to || tmp > bsize);
547 data = kmap_atomic(page);
548 memcpy(data + pos, AFFS_DATA(bh) + boff, tmp);
549 kunmap_atomic(data);
550 affs_brelse(bh);
551 bidx++;
552 pos += tmp;
553 boff = 0;
554 }
555 flush_dcache_page(page);
556 return 0;
557}
558
559static int
560affs_extent_file_ofs(struct inode *inode, u32 newsize)
561{
562 struct super_block *sb = inode->i_sb;
563 struct buffer_head *bh, *prev_bh;
564 u32 bidx, boff;
565 u32 size, bsize;
566 u32 tmp;
567
568 pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize);
569 bsize = AFFS_SB(sb)->s_data_blksize;
570 bh = NULL;
571 size = AFFS_I(inode)->mmu_private;
572 bidx = size / bsize;
573 boff = size % bsize;
574 if (boff) {
575 bh = affs_bread_ino(inode, bidx, 0);
576 if (IS_ERR(bh))
577 return PTR_ERR(bh);
578 tmp = min(bsize - boff, newsize - size);
579 BUG_ON(boff + tmp > bsize || tmp > bsize);
580 memset(AFFS_DATA(bh) + boff, 0, tmp);
581 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
582 affs_fix_checksum(sb, bh);
583 mark_buffer_dirty_inode(bh, inode);
584 size += tmp;
585 bidx++;
586 } else if (bidx) {
587 bh = affs_bread_ino(inode, bidx - 1, 0);
588 if (IS_ERR(bh))
589 return PTR_ERR(bh);
590 }
591
592 while (size < newsize) {
593 prev_bh = bh;
594 bh = affs_getzeroblk_ino(inode, bidx);
595 if (IS_ERR(bh))
596 goto out;
597 tmp = min(bsize, newsize - size);
598 BUG_ON(tmp > bsize);
599 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
600 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
601 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
602 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
603 affs_fix_checksum(sb, bh);
604 bh->b_state &= ~(1UL << BH_New);
605 mark_buffer_dirty_inode(bh, inode);
606 if (prev_bh) {
607 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
608
609 if (tmp_next)
610 affs_warning(sb, "extent_file_ofs",
611 "next block already set for %d (%d)",
612 bidx, tmp_next);
613 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
614 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
615 mark_buffer_dirty_inode(prev_bh, inode);
616 affs_brelse(prev_bh);
617 }
618 size += bsize;
619 bidx++;
620 }
621 affs_brelse(bh);
622 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
623 return 0;
624
625out:
626 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
627 return PTR_ERR(bh);
628}
629
630static int
631affs_readpage_ofs(struct file *file, struct page *page)
632{
633 struct inode *inode = page->mapping->host;
634 u32 to;
635 int err;
636
637 pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index);
638 to = PAGE_SIZE;
639 if (((page->index + 1) << PAGE_SHIFT) > inode->i_size) {
640 to = inode->i_size & ~PAGE_MASK;
641 memset(page_address(page) + to, 0, PAGE_SIZE - to);
642 }
643
644 err = affs_do_readpage_ofs(page, to, 0);
645 if (!err)
646 SetPageUptodate(page);
647 unlock_page(page);
648 return err;
649}
650
651static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
652 loff_t pos, unsigned len, unsigned flags,
653 struct page **pagep, void **fsdata)
654{
655 struct inode *inode = mapping->host;
656 struct page *page;
657 pgoff_t index;
658 int err = 0;
659
660 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
661 pos + len);
662 if (pos > AFFS_I(inode)->mmu_private) {
663
664
665
666 err = affs_extent_file_ofs(inode, pos);
667 if (err)
668 return err;
669 }
670
671 index = pos >> PAGE_SHIFT;
672 page = grab_cache_page_write_begin(mapping, index, flags);
673 if (!page)
674 return -ENOMEM;
675 *pagep = page;
676
677 if (PageUptodate(page))
678 return 0;
679
680
681 err = affs_do_readpage_ofs(page, PAGE_SIZE, 1);
682 if (err) {
683 unlock_page(page);
684 put_page(page);
685 }
686 return err;
687}
688
689static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
690 loff_t pos, unsigned len, unsigned copied,
691 struct page *page, void *fsdata)
692{
693 struct inode *inode = mapping->host;
694 struct super_block *sb = inode->i_sb;
695 struct buffer_head *bh, *prev_bh;
696 char *data;
697 u32 bidx, boff, bsize;
698 unsigned from, to;
699 u32 tmp;
700 int written;
701
702 from = pos & (PAGE_SIZE - 1);
703 to = from + len;
704
705
706
707
708
709
710 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
711 pos + len);
712 bsize = AFFS_SB(sb)->s_data_blksize;
713 data = page_address(page);
714
715 bh = NULL;
716 written = 0;
717 tmp = (page->index << PAGE_SHIFT) + from;
718 bidx = tmp / bsize;
719 boff = tmp % bsize;
720 if (boff) {
721 bh = affs_bread_ino(inode, bidx, 0);
722 if (IS_ERR(bh)) {
723 written = PTR_ERR(bh);
724 goto err_first_bh;
725 }
726 tmp = min(bsize - boff, to - from);
727 BUG_ON(boff + tmp > bsize || tmp > bsize);
728 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
729 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
730 affs_fix_checksum(sb, bh);
731 mark_buffer_dirty_inode(bh, inode);
732 written += tmp;
733 from += tmp;
734 bidx++;
735 } else if (bidx) {
736 bh = affs_bread_ino(inode, bidx - 1, 0);
737 if (IS_ERR(bh)) {
738 written = PTR_ERR(bh);
739 goto err_first_bh;
740 }
741 }
742 while (from + bsize <= to) {
743 prev_bh = bh;
744 bh = affs_getemptyblk_ino(inode, bidx);
745 if (IS_ERR(bh))
746 goto err_bh;
747 memcpy(AFFS_DATA(bh), data + from, bsize);
748 if (buffer_new(bh)) {
749 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
750 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
751 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
752 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
753 AFFS_DATA_HEAD(bh)->next = 0;
754 bh->b_state &= ~(1UL << BH_New);
755 if (prev_bh) {
756 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
757
758 if (tmp_next)
759 affs_warning(sb, "commit_write_ofs",
760 "next block already set for %d (%d)",
761 bidx, tmp_next);
762 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
763 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
764 mark_buffer_dirty_inode(prev_bh, inode);
765 }
766 }
767 affs_brelse(prev_bh);
768 affs_fix_checksum(sb, bh);
769 mark_buffer_dirty_inode(bh, inode);
770 written += bsize;
771 from += bsize;
772 bidx++;
773 }
774 if (from < to) {
775 prev_bh = bh;
776 bh = affs_bread_ino(inode, bidx, 1);
777 if (IS_ERR(bh))
778 goto err_bh;
779 tmp = min(bsize, to - from);
780 BUG_ON(tmp > bsize);
781 memcpy(AFFS_DATA(bh), data + from, tmp);
782 if (buffer_new(bh)) {
783 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
784 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
785 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
786 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
787 AFFS_DATA_HEAD(bh)->next = 0;
788 bh->b_state &= ~(1UL << BH_New);
789 if (prev_bh) {
790 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
791
792 if (tmp_next)
793 affs_warning(sb, "commit_write_ofs",
794 "next block already set for %d (%d)",
795 bidx, tmp_next);
796 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
797 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
798 mark_buffer_dirty_inode(prev_bh, inode);
799 }
800 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
801 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
802 affs_brelse(prev_bh);
803 affs_fix_checksum(sb, bh);
804 mark_buffer_dirty_inode(bh, inode);
805 written += tmp;
806 from += tmp;
807 bidx++;
808 }
809 SetPageUptodate(page);
810
811done:
812 affs_brelse(bh);
813 tmp = (page->index << PAGE_SHIFT) + from;
814 if (tmp > inode->i_size)
815 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
816
817
818 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
819 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
820 mark_inode_dirty(inode);
821 }
822
823err_first_bh:
824 unlock_page(page);
825 put_page(page);
826
827 return written;
828
829err_bh:
830 bh = prev_bh;
831 if (!written)
832 written = PTR_ERR(bh);
833 goto done;
834}
835
836const struct address_space_operations affs_aops_ofs = {
837 .set_page_dirty = __set_page_dirty_buffers,
838 .readpage = affs_readpage_ofs,
839
840 .write_begin = affs_write_begin_ofs,
841 .write_end = affs_write_end_ofs
842};
843
844
845
846void
847affs_free_prealloc(struct inode *inode)
848{
849 struct super_block *sb = inode->i_sb;
850
851 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
852
853 while (AFFS_I(inode)->i_pa_cnt) {
854 AFFS_I(inode)->i_pa_cnt--;
855 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
856 }
857}
858
859
860
861void
862affs_truncate(struct inode *inode)
863{
864 struct super_block *sb = inode->i_sb;
865 u32 ext, ext_key;
866 u32 last_blk, blkcnt, blk;
867 u32 size;
868 struct buffer_head *ext_bh;
869 int i;
870
871 pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n",
872 inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size);
873
874 last_blk = 0;
875 ext = 0;
876 if (inode->i_size) {
877 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
878 ext = last_blk / AFFS_SB(sb)->s_hashsize;
879 }
880
881 if (inode->i_size > AFFS_I(inode)->mmu_private) {
882 struct address_space *mapping = inode->i_mapping;
883 struct page *page;
884 void *fsdata;
885 loff_t isize = inode->i_size;
886 int res;
887
888 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata);
889 if (!res)
890 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata);
891 else
892 inode->i_size = AFFS_I(inode)->mmu_private;
893 mark_inode_dirty(inode);
894 return;
895 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
896 return;
897
898
899 ext_bh = affs_get_extblock(inode, ext);
900 if (IS_ERR(ext_bh)) {
901 affs_warning(sb, "truncate",
902 "unexpected read error for ext block %u (%ld)",
903 ext, PTR_ERR(ext_bh));
904 return;
905 }
906 if (AFFS_I(inode)->i_lc) {
907
908 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
909 if (AFFS_I(inode)->i_lc_size > i) {
910 AFFS_I(inode)->i_lc_size = i;
911 for (; i < AFFS_LC_SIZE; i++)
912 AFFS_I(inode)->i_lc[i] = 0;
913 }
914
915 for (i = 0; i < AFFS_AC_SIZE; i++)
916 if (AFFS_I(inode)->i_ac[i].ext >= ext)
917 AFFS_I(inode)->i_ac[i].ext = 0;
918 }
919 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
920
921 blkcnt = AFFS_I(inode)->i_blkcnt;
922 i = 0;
923 blk = last_blk;
924 if (inode->i_size) {
925 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
926 blk++;
927 } else
928 AFFS_HEAD(ext_bh)->first_data = 0;
929 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
930 size = AFFS_SB(sb)->s_hashsize;
931 if (size > blkcnt - blk + i)
932 size = blkcnt - blk + i;
933 for (; i < size; i++, blk++) {
934 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
935 AFFS_BLOCK(sb, ext_bh, i) = 0;
936 }
937 AFFS_TAIL(sb, ext_bh)->extension = 0;
938 affs_fix_checksum(sb, ext_bh);
939 mark_buffer_dirty_inode(ext_bh, inode);
940 affs_brelse(ext_bh);
941
942 if (inode->i_size) {
943 AFFS_I(inode)->i_blkcnt = last_blk + 1;
944 AFFS_I(inode)->i_extcnt = ext + 1;
945 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) {
946 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
947 u32 tmp;
948 if (IS_ERR(bh)) {
949 affs_warning(sb, "truncate",
950 "unexpected read error for last block %u (%ld)",
951 ext, PTR_ERR(bh));
952 return;
953 }
954 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
955 AFFS_DATA_HEAD(bh)->next = 0;
956 affs_adjust_checksum(bh, -tmp);
957 affs_brelse(bh);
958 }
959 } else {
960 AFFS_I(inode)->i_blkcnt = 0;
961 AFFS_I(inode)->i_extcnt = 1;
962 }
963 AFFS_I(inode)->mmu_private = inode->i_size;
964
965
966 while (ext_key) {
967 ext_bh = affs_bread(sb, ext_key);
968 size = AFFS_SB(sb)->s_hashsize;
969 if (size > blkcnt - blk)
970 size = blkcnt - blk;
971 for (i = 0; i < size; i++, blk++)
972 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
973 affs_free_block(sb, ext_key);
974 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
975 affs_brelse(ext_bh);
976 }
977 affs_free_prealloc(inode);
978}
979
980int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
981{
982 struct inode *inode = filp->f_mapping->host;
983 int ret, err;
984
985 err = file_write_and_wait_range(filp, start, end);
986 if (err)
987 return err;
988
989 inode_lock(inode);
990 ret = write_inode_now(inode, 0);
991 err = sync_blockdev(inode->i_sb->s_bdev);
992 if (!ret)
993 ret = err;
994 inode_unlock(inode);
995 return ret;
996}
997const struct file_operations affs_file_operations = {
998 .llseek = generic_file_llseek,
999 .read_iter = generic_file_read_iter,
1000 .write_iter = generic_file_write_iter,
1001 .mmap = generic_file_mmap,
1002 .open = affs_file_open,
1003 .release = affs_file_release,
1004 .fsync = affs_file_fsync,
1005 .splice_read = generic_file_splice_read,
1006};
1007
1008const struct inode_operations affs_file_inode_operations = {
1009 .setattr = affs_notify_change,
1010};
1011
