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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 .dirty_folio = block_dirty_folio,
457 .invalidate_folio = block_invalidate_folio,
458 .readpage = affs_readpage,
459 .writepage = affs_writepage,
460 .write_begin = affs_write_begin,
461 .write_end = affs_write_end,
462 .direct_IO = affs_direct_IO,
463 .bmap = _affs_bmap
464};
465
466static inline struct buffer_head *
467affs_bread_ino(struct inode *inode, int block, int create)
468{
469 struct buffer_head *bh, tmp_bh;
470 int err;
471
472 tmp_bh.b_state = 0;
473 err = affs_get_block(inode, block, &tmp_bh, create);
474 if (!err) {
475 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
476 if (bh) {
477 bh->b_state |= tmp_bh.b_state;
478 return bh;
479 }
480 err = -EIO;
481 }
482 return ERR_PTR(err);
483}
484
485static inline struct buffer_head *
486affs_getzeroblk_ino(struct inode *inode, int block)
487{
488 struct buffer_head *bh, tmp_bh;
489 int err;
490
491 tmp_bh.b_state = 0;
492 err = affs_get_block(inode, block, &tmp_bh, 1);
493 if (!err) {
494 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
495 if (bh) {
496 bh->b_state |= tmp_bh.b_state;
497 return bh;
498 }
499 err = -EIO;
500 }
501 return ERR_PTR(err);
502}
503
504static inline struct buffer_head *
505affs_getemptyblk_ino(struct inode *inode, int block)
506{
507 struct buffer_head *bh, tmp_bh;
508 int err;
509
510 tmp_bh.b_state = 0;
511 err = affs_get_block(inode, block, &tmp_bh, 1);
512 if (!err) {
513 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
514 if (bh) {
515 bh->b_state |= tmp_bh.b_state;
516 return bh;
517 }
518 err = -EIO;
519 }
520 return ERR_PTR(err);
521}
522
523static int
524affs_do_readpage_ofs(struct page *page, unsigned to, int create)
525{
526 struct inode *inode = page->mapping->host;
527 struct super_block *sb = inode->i_sb;
528 struct buffer_head *bh;
529 char *data;
530 unsigned pos = 0;
531 u32 bidx, boff, bsize;
532 u32 tmp;
533
534 pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino,
535 page->index, to);
536 BUG_ON(to > PAGE_SIZE);
537 bsize = AFFS_SB(sb)->s_data_blksize;
538 tmp = page->index << PAGE_SHIFT;
539 bidx = tmp / bsize;
540 boff = tmp % bsize;
541
542 while (pos < to) {
543 bh = affs_bread_ino(inode, bidx, create);
544 if (IS_ERR(bh))
545 return PTR_ERR(bh);
546 tmp = min(bsize - boff, to - pos);
547 BUG_ON(pos + tmp > to || tmp > bsize);
548 data = kmap_atomic(page);
549 memcpy(data + pos, AFFS_DATA(bh) + boff, tmp);
550 kunmap_atomic(data);
551 affs_brelse(bh);
552 bidx++;
553 pos += tmp;
554 boff = 0;
555 }
556 flush_dcache_page(page);
557 return 0;
558}
559
560static int
561affs_extent_file_ofs(struct inode *inode, u32 newsize)
562{
563 struct super_block *sb = inode->i_sb;
564 struct buffer_head *bh, *prev_bh;
565 u32 bidx, boff;
566 u32 size, bsize;
567 u32 tmp;
568
569 pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize);
570 bsize = AFFS_SB(sb)->s_data_blksize;
571 bh = NULL;
572 size = AFFS_I(inode)->mmu_private;
573 bidx = size / bsize;
574 boff = size % bsize;
575 if (boff) {
576 bh = affs_bread_ino(inode, bidx, 0);
577 if (IS_ERR(bh))
578 return PTR_ERR(bh);
579 tmp = min(bsize - boff, newsize - size);
580 BUG_ON(boff + tmp > bsize || tmp > bsize);
581 memset(AFFS_DATA(bh) + boff, 0, tmp);
582 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
583 affs_fix_checksum(sb, bh);
584 mark_buffer_dirty_inode(bh, inode);
585 size += tmp;
586 bidx++;
587 } else if (bidx) {
588 bh = affs_bread_ino(inode, bidx - 1, 0);
589 if (IS_ERR(bh))
590 return PTR_ERR(bh);
591 }
592
593 while (size < newsize) {
594 prev_bh = bh;
595 bh = affs_getzeroblk_ino(inode, bidx);
596 if (IS_ERR(bh))
597 goto out;
598 tmp = min(bsize, newsize - size);
599 BUG_ON(tmp > bsize);
600 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
601 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
602 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
603 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
604 affs_fix_checksum(sb, bh);
605 bh->b_state &= ~(1UL << BH_New);
606 mark_buffer_dirty_inode(bh, inode);
607 if (prev_bh) {
608 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
609
610 if (tmp_next)
611 affs_warning(sb, "extent_file_ofs",
612 "next block already set for %d (%d)",
613 bidx, tmp_next);
614 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
615 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
616 mark_buffer_dirty_inode(prev_bh, inode);
617 affs_brelse(prev_bh);
618 }
619 size += bsize;
620 bidx++;
621 }
622 affs_brelse(bh);
623 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
624 return 0;
625
626out:
627 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
628 return PTR_ERR(bh);
629}
630
631static int
632affs_readpage_ofs(struct file *file, struct page *page)
633{
634 struct inode *inode = page->mapping->host;
635 u32 to;
636 int err;
637
638 pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index);
639 to = PAGE_SIZE;
640 if (((page->index + 1) << PAGE_SHIFT) > inode->i_size) {
641 to = inode->i_size & ~PAGE_MASK;
642 memset(page_address(page) + to, 0, PAGE_SIZE - to);
643 }
644
645 err = affs_do_readpage_ofs(page, to, 0);
646 if (!err)
647 SetPageUptodate(page);
648 unlock_page(page);
649 return err;
650}
651
652static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
653 loff_t pos, unsigned len, unsigned flags,
654 struct page **pagep, void **fsdata)
655{
656 struct inode *inode = mapping->host;
657 struct page *page;
658 pgoff_t index;
659 int err = 0;
660
661 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
662 pos + len);
663 if (pos > AFFS_I(inode)->mmu_private) {
664
665
666
667 err = affs_extent_file_ofs(inode, pos);
668 if (err)
669 return err;
670 }
671
672 index = pos >> PAGE_SHIFT;
673 page = grab_cache_page_write_begin(mapping, index, flags);
674 if (!page)
675 return -ENOMEM;
676 *pagep = page;
677
678 if (PageUptodate(page))
679 return 0;
680
681
682 err = affs_do_readpage_ofs(page, PAGE_SIZE, 1);
683 if (err) {
684 unlock_page(page);
685 put_page(page);
686 }
687 return err;
688}
689
690static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
691 loff_t pos, unsigned len, unsigned copied,
692 struct page *page, void *fsdata)
693{
694 struct inode *inode = mapping->host;
695 struct super_block *sb = inode->i_sb;
696 struct buffer_head *bh, *prev_bh;
697 char *data;
698 u32 bidx, boff, bsize;
699 unsigned from, to;
700 u32 tmp;
701 int written;
702
703 from = pos & (PAGE_SIZE - 1);
704 to = from + len;
705
706
707
708
709
710
711 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
712 pos + len);
713 bsize = AFFS_SB(sb)->s_data_blksize;
714 data = page_address(page);
715
716 bh = NULL;
717 written = 0;
718 tmp = (page->index << PAGE_SHIFT) + from;
719 bidx = tmp / bsize;
720 boff = tmp % bsize;
721 if (boff) {
722 bh = affs_bread_ino(inode, bidx, 0);
723 if (IS_ERR(bh)) {
724 written = PTR_ERR(bh);
725 goto err_first_bh;
726 }
727 tmp = min(bsize - boff, to - from);
728 BUG_ON(boff + tmp > bsize || tmp > bsize);
729 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
730 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
731 affs_fix_checksum(sb, bh);
732 mark_buffer_dirty_inode(bh, inode);
733 written += tmp;
734 from += tmp;
735 bidx++;
736 } else if (bidx) {
737 bh = affs_bread_ino(inode, bidx - 1, 0);
738 if (IS_ERR(bh)) {
739 written = PTR_ERR(bh);
740 goto err_first_bh;
741 }
742 }
743 while (from + bsize <= to) {
744 prev_bh = bh;
745 bh = affs_getemptyblk_ino(inode, bidx);
746 if (IS_ERR(bh))
747 goto err_bh;
748 memcpy(AFFS_DATA(bh), data + from, bsize);
749 if (buffer_new(bh)) {
750 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
751 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
752 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
753 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
754 AFFS_DATA_HEAD(bh)->next = 0;
755 bh->b_state &= ~(1UL << BH_New);
756 if (prev_bh) {
757 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
758
759 if (tmp_next)
760 affs_warning(sb, "commit_write_ofs",
761 "next block already set for %d (%d)",
762 bidx, tmp_next);
763 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
764 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
765 mark_buffer_dirty_inode(prev_bh, inode);
766 }
767 }
768 affs_brelse(prev_bh);
769 affs_fix_checksum(sb, bh);
770 mark_buffer_dirty_inode(bh, inode);
771 written += bsize;
772 from += bsize;
773 bidx++;
774 }
775 if (from < to) {
776 prev_bh = bh;
777 bh = affs_bread_ino(inode, bidx, 1);
778 if (IS_ERR(bh))
779 goto err_bh;
780 tmp = min(bsize, to - from);
781 BUG_ON(tmp > bsize);
782 memcpy(AFFS_DATA(bh), data + from, tmp);
783 if (buffer_new(bh)) {
784 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
785 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
786 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
787 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
788 AFFS_DATA_HEAD(bh)->next = 0;
789 bh->b_state &= ~(1UL << BH_New);
790 if (prev_bh) {
791 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
792
793 if (tmp_next)
794 affs_warning(sb, "commit_write_ofs",
795 "next block already set for %d (%d)",
796 bidx, tmp_next);
797 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
798 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
799 mark_buffer_dirty_inode(prev_bh, inode);
800 }
801 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
802 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
803 affs_brelse(prev_bh);
804 affs_fix_checksum(sb, bh);
805 mark_buffer_dirty_inode(bh, inode);
806 written += tmp;
807 from += tmp;
808 bidx++;
809 }
810 SetPageUptodate(page);
811
812done:
813 affs_brelse(bh);
814 tmp = (page->index << PAGE_SHIFT) + from;
815 if (tmp > inode->i_size)
816 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
817
818
819 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
820 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
821 mark_inode_dirty(inode);
822 }
823
824err_first_bh:
825 unlock_page(page);
826 put_page(page);
827
828 return written;
829
830err_bh:
831 bh = prev_bh;
832 if (!written)
833 written = PTR_ERR(bh);
834 goto done;
835}
836
837const struct address_space_operations affs_aops_ofs = {
838 .dirty_folio = block_dirty_folio,
839 .invalidate_folio = block_invalidate_folio,
840 .readpage = affs_readpage_ofs,
841
842 .write_begin = affs_write_begin_ofs,
843 .write_end = affs_write_end_ofs
844};
845
846
847
848void
849affs_free_prealloc(struct inode *inode)
850{
851 struct super_block *sb = inode->i_sb;
852
853 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
854
855 while (AFFS_I(inode)->i_pa_cnt) {
856 AFFS_I(inode)->i_pa_cnt--;
857 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
858 }
859}
860
861
862
863void
864affs_truncate(struct inode *inode)
865{
866 struct super_block *sb = inode->i_sb;
867 u32 ext, ext_key;
868 u32 last_blk, blkcnt, blk;
869 u32 size;
870 struct buffer_head *ext_bh;
871 int i;
872
873 pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n",
874 inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size);
875
876 last_blk = 0;
877 ext = 0;
878 if (inode->i_size) {
879 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
880 ext = last_blk / AFFS_SB(sb)->s_hashsize;
881 }
882
883 if (inode->i_size > AFFS_I(inode)->mmu_private) {
884 struct address_space *mapping = inode->i_mapping;
885 struct page *page;
886 void *fsdata;
887 loff_t isize = inode->i_size;
888 int res;
889
890 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata);
891 if (!res)
892 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata);
893 else
894 inode->i_size = AFFS_I(inode)->mmu_private;
895 mark_inode_dirty(inode);
896 return;
897 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
898 return;
899
900
901 ext_bh = affs_get_extblock(inode, ext);
902 if (IS_ERR(ext_bh)) {
903 affs_warning(sb, "truncate",
904 "unexpected read error for ext block %u (%ld)",
905 ext, PTR_ERR(ext_bh));
906 return;
907 }
908 if (AFFS_I(inode)->i_lc) {
909
910 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
911 if (AFFS_I(inode)->i_lc_size > i) {
912 AFFS_I(inode)->i_lc_size = i;
913 for (; i < AFFS_LC_SIZE; i++)
914 AFFS_I(inode)->i_lc[i] = 0;
915 }
916
917 for (i = 0; i < AFFS_AC_SIZE; i++)
918 if (AFFS_I(inode)->i_ac[i].ext >= ext)
919 AFFS_I(inode)->i_ac[i].ext = 0;
920 }
921 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
922
923 blkcnt = AFFS_I(inode)->i_blkcnt;
924 i = 0;
925 blk = last_blk;
926 if (inode->i_size) {
927 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
928 blk++;
929 } else
930 AFFS_HEAD(ext_bh)->first_data = 0;
931 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
932 size = AFFS_SB(sb)->s_hashsize;
933 if (size > blkcnt - blk + i)
934 size = blkcnt - blk + i;
935 for (; i < size; i++, blk++) {
936 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
937 AFFS_BLOCK(sb, ext_bh, i) = 0;
938 }
939 AFFS_TAIL(sb, ext_bh)->extension = 0;
940 affs_fix_checksum(sb, ext_bh);
941 mark_buffer_dirty_inode(ext_bh, inode);
942 affs_brelse(ext_bh);
943
944 if (inode->i_size) {
945 AFFS_I(inode)->i_blkcnt = last_blk + 1;
946 AFFS_I(inode)->i_extcnt = ext + 1;
947 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) {
948 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
949 u32 tmp;
950 if (IS_ERR(bh)) {
951 affs_warning(sb, "truncate",
952 "unexpected read error for last block %u (%ld)",
953 ext, PTR_ERR(bh));
954 return;
955 }
956 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
957 AFFS_DATA_HEAD(bh)->next = 0;
958 affs_adjust_checksum(bh, -tmp);
959 affs_brelse(bh);
960 }
961 } else {
962 AFFS_I(inode)->i_blkcnt = 0;
963 AFFS_I(inode)->i_extcnt = 1;
964 }
965 AFFS_I(inode)->mmu_private = inode->i_size;
966
967
968 while (ext_key) {
969 ext_bh = affs_bread(sb, ext_key);
970 size = AFFS_SB(sb)->s_hashsize;
971 if (size > blkcnt - blk)
972 size = blkcnt - blk;
973 for (i = 0; i < size; i++, blk++)
974 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
975 affs_free_block(sb, ext_key);
976 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
977 affs_brelse(ext_bh);
978 }
979 affs_free_prealloc(inode);
980}
981
982int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
983{
984 struct inode *inode = filp->f_mapping->host;
985 int ret, err;
986
987 err = file_write_and_wait_range(filp, start, end);
988 if (err)
989 return err;
990
991 inode_lock(inode);
992 ret = write_inode_now(inode, 0);
993 err = sync_blockdev(inode->i_sb->s_bdev);
994 if (!ret)
995 ret = err;
996 inode_unlock(inode);
997 return ret;
998}
999const struct file_operations affs_file_operations = {
1000 .llseek = generic_file_llseek,
1001 .read_iter = generic_file_read_iter,
1002 .write_iter = generic_file_write_iter,
1003 .mmap = generic_file_mmap,
1004 .open = affs_file_open,
1005 .release = affs_file_release,
1006 .fsync = affs_file_fsync,
1007 .splice_read = generic_file_splice_read,
1008};
1009
1010const struct inode_operations affs_file_inode_operations = {
1011 .setattr = affs_notify_change,
1012};
1013