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15#include <asm/div64.h>
16#include <asm/uaccess.h>
17#include <asm/system.h>
18#include <linux/sched.h>
19#include <linux/affs_fs.h>
20#include <linux/fcntl.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/slab.h>
24#include <linux/stat.h>
25#include <linux/locks.h>
26#include <linux/smp_lock.h>
27#include <linux/dirent.h>
28#include <linux/fs.h>
29#include <linux/amigaffs.h>
30#include <linux/mm.h>
31#include <linux/pagemap.h>
32
33#if PAGE_SIZE < 4096
34#error PAGE_SIZE must be at least 4096
35#endif
36
37static int affs_grow_extcache(struct inode *inode, u32 lc_idx);
38static struct buffer_head *affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext);
39static inline struct buffer_head *affs_get_extblock(struct inode *inode, u32 ext);
40static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
41static int affs_get_block(struct inode *inode, long block, struct buffer_head *bh_result, int create);
42
43static ssize_t affs_file_write(struct file *filp, const char *buf, size_t count, loff_t *ppos);
44static int affs_file_open(struct inode *inode, struct file *filp);
45static int affs_file_release(struct inode *inode, struct file *filp);
46
47struct file_operations affs_file_operations = {
48 llseek: generic_file_llseek,
49 read: generic_file_read,
50 write: affs_file_write,
51 mmap: generic_file_mmap,
52 open: affs_file_open,
53 release: affs_file_release,
54 fsync: file_fsync,
55};
56
57struct inode_operations affs_file_inode_operations = {
58 truncate: affs_truncate,
59 setattr: affs_notify_change,
60};
61
62static int
63affs_file_open(struct inode *inode, struct file *filp)
64{
65 if (atomic_read(&filp->f_count) != 1)
66 return 0;
67 pr_debug("AFFS: open(%d)\n", AFFS_INODE->i_opencnt);
68 AFFS_INODE->i_opencnt++;
69 return 0;
70}
71
72static int
73affs_file_release(struct inode *inode, struct file *filp)
74{
75 if (atomic_read(&filp->f_count) != 0)
76 return 0;
77 pr_debug("AFFS: release(%d)\n", AFFS_INODE->i_opencnt);
78 AFFS_INODE->i_opencnt--;
79 if (!AFFS_INODE->i_opencnt)
80 affs_free_prealloc(inode);
81
82 return 0;
83}
84
85static int
86affs_grow_extcache(struct inode *inode, u32 lc_idx)
87{
88 struct super_block *sb = inode->i_sb;
89 struct buffer_head *bh;
90 u32 lc_max;
91 int i, j, key;
92
93 if (!AFFS_INODE->i_lc) {
94 char *ptr = (char *)get_zeroed_page(GFP_NOFS);
95 if (!ptr)
96 return -ENOMEM;
97 AFFS_INODE->i_lc = (u32 *)ptr;
98 AFFS_INODE->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2);
99 }
100
101 lc_max = AFFS_LC_SIZE << AFFS_INODE->i_lc_shift;
102
103 if (AFFS_INODE->i_extcnt > lc_max) {
104 u32 lc_shift, lc_mask, tmp, off;
105
106
107 lc_shift = AFFS_INODE->i_lc_shift;
108 tmp = (AFFS_INODE->i_extcnt / AFFS_LC_SIZE) >> lc_shift;
109 for (; tmp; tmp >>= 1)
110 lc_shift++;
111 lc_mask = (1 << lc_shift) - 1;
112
113
114 lc_idx >>= (lc_shift - AFFS_INODE->i_lc_shift);
115 AFFS_INODE->i_lc_size >>= (lc_shift - AFFS_INODE->i_lc_shift);
116
117
118 off = 1 << (lc_shift - AFFS_INODE->i_lc_shift);
119 for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off)
120 AFFS_INODE->i_ac[i] = AFFS_INODE->i_ac[j];
121
122 AFFS_INODE->i_lc_shift = lc_shift;
123 AFFS_INODE->i_lc_mask = lc_mask;
124 }
125
126
127 i = AFFS_INODE->i_lc_size;
128 AFFS_INODE->i_lc_size = lc_idx + 1;
129 for (; i <= lc_idx; i++) {
130 if (!i) {
131 AFFS_INODE->i_lc[0] = inode->i_ino;
132 continue;
133 }
134 key = AFFS_INODE->i_lc[i - 1];
135 j = AFFS_INODE->i_lc_mask + 1;
136
137 for (; j > 0; j--) {
138 bh = affs_bread(sb, key);
139 if (!bh)
140 goto err;
141 key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
142 affs_brelse(bh);
143 }
144
145 AFFS_INODE->i_lc[i] = key;
146 }
147
148 return 0;
149
150err:
151
152 return -EIO;
153}
154
155static struct buffer_head *
156affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext)
157{
158 struct super_block *sb = inode->i_sb;
159 struct buffer_head *new_bh;
160 u32 blocknr, tmp;
161
162 blocknr = affs_alloc_block(inode, bh->b_blocknr);
163 if (!blocknr)
164 return ERR_PTR(-ENOSPC);
165
166 new_bh = affs_getzeroblk(sb, blocknr);
167 if (!new_bh) {
168 affs_free_block(sb, blocknr);
169 return ERR_PTR(-EIO);
170 }
171
172 AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST);
173 AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr);
174 AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE);
175 AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino);
176 affs_fix_checksum(sb, new_bh);
177
178 mark_buffer_dirty_inode(new_bh, inode);
179
180 tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
181 if (tmp)
182 affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp);
183 AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr);
184 affs_adjust_checksum(bh, blocknr - tmp);
185 mark_buffer_dirty_inode(bh, inode);
186
187 AFFS_INODE->i_extcnt++;
188 mark_inode_dirty(inode);
189
190 return new_bh;
191}
192
193static inline struct buffer_head *
194affs_get_extblock(struct inode *inode, u32 ext)
195{
196
197 struct buffer_head *bh = AFFS_INODE->i_ext_bh;
198 if (ext == AFFS_INODE->i_ext_last)
199 atomic_inc(&bh->b_count);
200 else
201
202 bh = affs_get_extblock_slow(inode, ext);
203
204 return bh;
205}
206
207static struct buffer_head *
208affs_get_extblock_slow(struct inode *inode, u32 ext)
209{
210 struct super_block *sb = inode->i_sb;
211 struct buffer_head *bh;
212 u32 ext_key;
213 u32 lc_idx, lc_off, ac_idx;
214 u32 tmp, idx;
215
216 if (ext == AFFS_INODE->i_ext_last + 1) {
217
218 bh = AFFS_INODE->i_ext_bh;
219 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
220 if (ext < AFFS_INODE->i_extcnt)
221 goto read_ext;
222 if (ext > AFFS_INODE->i_extcnt)
223 BUG();
224 bh = affs_alloc_extblock(inode, bh, ext);
225 if (IS_ERR(bh))
226 return bh;
227 goto store_ext;
228 }
229
230 if (ext == 0) {
231
232 ext_key = inode->i_ino;
233 goto read_ext;
234 }
235
236 if (ext >= AFFS_INODE->i_extcnt) {
237 struct buffer_head *prev_bh;
238
239
240 if (ext > AFFS_INODE->i_extcnt)
241 BUG();
242
243
244 prev_bh = affs_get_extblock(inode, ext - 1);
245 if (IS_ERR(prev_bh))
246 return prev_bh;
247 bh = affs_alloc_extblock(inode, prev_bh, ext);
248 affs_brelse(prev_bh);
249 if (IS_ERR(bh))
250 return bh;
251 goto store_ext;
252 }
253
254again:
255
256 lc_idx = ext >> AFFS_INODE->i_lc_shift;
257 lc_off = ext & AFFS_INODE->i_lc_mask;
258
259 if (lc_idx >= AFFS_INODE->i_lc_size) {
260 int err;
261
262 err = affs_grow_extcache(inode, lc_idx);
263 if (err)
264 return ERR_PTR(err);
265 goto again;
266 }
267
268
269 if (!lc_off) {
270 ext_key = AFFS_INODE->i_lc[lc_idx];
271 goto read_ext;
272 }
273
274
275 ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK;
276 if (AFFS_INODE->i_ac[ac_idx].ext == ext) {
277 ext_key = AFFS_INODE->i_ac[ac_idx].key;
278 goto read_ext;
279 }
280
281
282 tmp = ext;
283 idx = ac_idx;
284 while (--tmp, --lc_off > 0) {
285 idx = (idx - 1) & AFFS_AC_MASK;
286 if (AFFS_INODE->i_ac[idx].ext == tmp) {
287 ext_key = AFFS_INODE->i_ac[idx].key;
288 goto find_ext;
289 }
290 }
291
292
293 ext_key = AFFS_INODE->i_lc[lc_idx];
294find_ext:
295
296
297 do {
298 bh = affs_bread(sb, ext_key);
299 if (!bh)
300 goto err_bread;
301 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
302 affs_brelse(bh);
303 tmp++;
304 } while (tmp < ext);
305
306
307
308
309 AFFS_INODE->i_ac[ac_idx].ext = ext;
310 AFFS_INODE->i_ac[ac_idx].key = ext_key;
311
312read_ext:
313
314
315 bh = affs_bread(sb, ext_key);
316 if (!bh)
317 goto err_bread;
318
319
320store_ext:
321
322 affs_brelse(AFFS_INODE->i_ext_bh);
323 AFFS_INODE->i_ext_last = ext;
324 AFFS_INODE->i_ext_bh = bh;
325 atomic_inc(&bh->b_count);
326
327 return bh;
328
329err_bread:
330 affs_brelse(bh);
331 return ERR_PTR(-EIO);
332}
333
334static int
335affs_get_block(struct inode *inode, long block, struct buffer_head *bh_result, int create)
336{
337 struct super_block *sb = inode->i_sb;
338 struct buffer_head *ext_bh;
339 u32 ext;
340
341 pr_debug("AFFS: get_block(%u, %ld)\n", (u32)inode->i_ino, block);
342
343 if (block < 0)
344 goto err_small;
345
346 if (block >= AFFS_INODE->i_blkcnt) {
347 if (block > AFFS_INODE->i_blkcnt || !create)
348 goto err_big;
349 } else
350 create = 0;
351
352
353 affs_lock_ext(inode);
354
355 ext = block / AFFS_SB->s_hashsize;
356 block -= ext * AFFS_SB->s_hashsize;
357 ext_bh = affs_get_extblock(inode, ext);
358 if (IS_ERR(ext_bh))
359 goto err_ext;
360 bh_result->b_blocknr = be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block));
361 bh_result->b_dev = inode->i_dev;
362 bh_result->b_state |= (1UL << BH_Mapped);
363
364 if (create) {
365 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
366 if (!blocknr)
367 goto err_alloc;
368 bh_result->b_state |= (1UL << BH_New);
369 AFFS_INODE->mmu_private += AFFS_SB->s_data_blksize;
370 AFFS_INODE->i_blkcnt++;
371
372
373 if (bh_result->b_blocknr)
374 affs_warning(sb, "get_block", "block already set (%x)", bh_result->b_blocknr);
375 AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr);
376 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1);
377 affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1);
378 bh_result->b_blocknr = blocknr;
379
380 if (!block) {
381
382 u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data);
383 if (tmp)
384 affs_warning(sb, "get_block", "first block already set (%d)", tmp);
385 AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr);
386 affs_adjust_checksum(ext_bh, blocknr - tmp);
387 }
388 }
389
390 affs_brelse(ext_bh);
391
392 affs_unlock_ext(inode);
393 return 0;
394
395err_small:
396 affs_error(inode->i_sb,"get_block","Block < 0");
397 return -EIO;
398err_big:
399 affs_error(inode->i_sb,"get_block","strange block request %d", block);
400 return -EIO;
401err_ext:
402
403 affs_unlock_ext(inode);
404 return PTR_ERR(ext_bh);
405err_alloc:
406 brelse(ext_bh);
407 bh_result->b_state &= ~(1UL << BH_Mapped);
408
409 affs_unlock_ext(inode);
410 return -ENOSPC;
411}
412
413static int affs_writepage(struct page *page)
414{
415 return block_write_full_page(page, affs_get_block);
416}
417static int affs_readpage(struct file *file, struct page *page)
418{
419 return block_read_full_page(page, affs_get_block);
420}
421static int affs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
422{
423 return cont_prepare_write(page, from, to, affs_get_block,
424 &page->mapping->host->u.affs_i.mmu_private);
425}
426static int _affs_bmap(struct address_space *mapping, long block)
427{
428 return generic_block_bmap(mapping,block,affs_get_block);
429}
430struct address_space_operations affs_aops = {
431 readpage: affs_readpage,
432 writepage: affs_writepage,
433 sync_page: block_sync_page,
434 prepare_write: affs_prepare_write,
435 commit_write: generic_commit_write,
436 bmap: _affs_bmap
437};
438
439static inline struct buffer_head *
440affs_bread_ino(struct inode *inode, int block, int create)
441{
442 struct buffer_head *bh, tmp_bh;
443 int err;
444
445 tmp_bh.b_state = 0;
446 err = affs_get_block(inode, block, &tmp_bh, create);
447 if (!err) {
448 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
449 if (bh) {
450 bh->b_state |= tmp_bh.b_state;
451 return bh;
452 }
453 err = -EIO;
454 }
455 return ERR_PTR(err);
456}
457
458static inline struct buffer_head *
459affs_getzeroblk_ino(struct inode *inode, int block)
460{
461 struct buffer_head *bh, tmp_bh;
462 int err;
463
464 tmp_bh.b_state = 0;
465 err = affs_get_block(inode, block, &tmp_bh, 1);
466 if (!err) {
467 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
468 if (bh) {
469 bh->b_state |= tmp_bh.b_state;
470 return bh;
471 }
472 err = -EIO;
473 }
474 return ERR_PTR(err);
475}
476
477static inline struct buffer_head *
478affs_getemptyblk_ino(struct inode *inode, int block)
479{
480 struct buffer_head *bh, tmp_bh;
481 int err;
482
483 tmp_bh.b_state = 0;
484 err = affs_get_block(inode, block, &tmp_bh, 1);
485 if (!err) {
486 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
487 if (bh) {
488 bh->b_state |= tmp_bh.b_state;
489 return bh;
490 }
491 err = -EIO;
492 }
493 return ERR_PTR(err);
494}
495
496static ssize_t
497affs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
498{
499 ssize_t retval;
500
501 retval = generic_file_write (file, buf, count, ppos);
502 if (retval >0) {
503 struct inode *inode = file->f_dentry->d_inode;
504 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
505 mark_inode_dirty(inode);
506 }
507 return retval;
508}
509
510static int
511affs_do_readpage_ofs(struct file *file, struct page *page, unsigned from, unsigned to)
512{
513 struct inode *inode = page->mapping->host;
514 struct super_block *sb = inode->i_sb;
515 struct buffer_head *bh;
516 char *data;
517 u32 bidx, boff, bsize;
518 u32 tmp;
519
520 pr_debug("AFFS: read_page(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to);
521 if (from > to || to > PAGE_CACHE_SIZE)
522 BUG();
523 data = page_address(page);
524 bsize = AFFS_SB->s_data_blksize;
525 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
526 bidx = tmp / bsize;
527 boff = tmp % bsize;
528
529 while (from < to) {
530 bh = affs_bread_ino(inode, bidx, 0);
531 if (IS_ERR(bh))
532 return PTR_ERR(bh);
533 tmp = min(bsize - boff, to - from);
534 if (from + tmp > to || tmp > bsize)
535 BUG();
536 memcpy(data + from, AFFS_DATA(bh) + boff, tmp);
537 affs_brelse(bh);
538 bidx++;
539 from += tmp;
540 boff = 0;
541 }
542 return 0;
543}
544
545static int
546affs_extent_file_ofs(struct inode *inode, u32 newsize)
547{
548 struct super_block *sb = inode->i_sb;
549 struct buffer_head *bh, *prev_bh;
550 u32 bidx, boff;
551 u32 size, bsize;
552 u32 tmp;
553
554 pr_debug("AFFS: extent_file(%u, %d)\n", (u32)inode->i_ino, newsize);
555 bsize = AFFS_SB->s_data_blksize;
556 bh = NULL;
557 size = AFFS_INODE->mmu_private;
558 bidx = size / bsize;
559 boff = size % bsize;
560 if (boff) {
561 bh = affs_bread_ino(inode, bidx, 0);
562 if (IS_ERR(bh))
563 return PTR_ERR(bh);
564 tmp = min(bsize - boff, newsize - size);
565 if (boff + tmp > bsize || tmp > bsize)
566 BUG();
567 memset(AFFS_DATA(bh) + boff, 0, tmp);
568 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(be32_to_cpu(AFFS_DATA_HEAD(bh)->size) + tmp);
569 affs_fix_checksum(sb, bh);
570 mark_buffer_dirty_inode(bh, inode);
571 size += tmp;
572 bidx++;
573 } else if (bidx) {
574 bh = affs_bread_ino(inode, bidx - 1, 0);
575 if (IS_ERR(bh))
576 return PTR_ERR(bh);
577 }
578
579 while (size < newsize) {
580 prev_bh = bh;
581 bh = affs_getzeroblk_ino(inode, bidx);
582 if (IS_ERR(bh))
583 goto out;
584 tmp = min(bsize, newsize - size);
585 if (tmp > bsize)
586 BUG();
587 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
588 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
589 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
590 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
591 affs_fix_checksum(sb, bh);
592 bh->b_state &= ~(1UL << BH_New);
593 mark_buffer_dirty_inode(bh, inode);
594 if (prev_bh) {
595 u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
596 if (tmp)
597 affs_warning(sb, "extent_file_ofs", "next block already set for %d (%d)", bidx, tmp);
598 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
599 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
600 mark_buffer_dirty_inode(prev_bh, inode);
601 affs_brelse(prev_bh);
602 }
603 size += bsize;
604 bidx++;
605 }
606 affs_brelse(bh);
607 inode->i_size = AFFS_INODE->mmu_private = newsize;
608 return 0;
609
610out:
611 inode->i_size = AFFS_INODE->mmu_private = size;
612 return PTR_ERR(bh);
613}
614
615static int
616affs_readpage_ofs(struct file *file, struct page *page)
617{
618 struct inode *inode = page->mapping->host;
619 u32 to;
620 int err;
621
622 pr_debug("AFFS: read_page(%u, %ld)\n", (u32)inode->i_ino, page->index);
623 to = PAGE_CACHE_SIZE;
624 if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) {
625 to = inode->i_size & ~PAGE_CACHE_MASK;
626 memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to);
627 }
628
629 err = affs_do_readpage_ofs(file, page, 0, to);
630 if (!err)
631 SetPageUptodate(page);
632 UnlockPage(page);
633 return err;
634}
635
636static int affs_prepare_write_ofs(struct file *file, struct page *page, unsigned from, unsigned to)
637{
638 struct inode *inode = page->mapping->host;
639 u32 size, offset;
640 u32 tmp;
641 int err = 0;
642
643 pr_debug("AFFS: prepare_write(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to);
644 offset = page->index << PAGE_CACHE_SHIFT;
645 if (offset + from > AFFS_INODE->mmu_private) {
646 err = affs_extent_file_ofs(inode, offset + from);
647 if (err)
648 return err;
649 }
650 size = inode->i_size;
651
652 if (Page_Uptodate(page))
653 return 0;
654
655 if (from) {
656 err = affs_do_readpage_ofs(file, page, 0, from);
657 if (err)
658 return err;
659 }
660 if (to < PAGE_CACHE_SIZE) {
661 memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to);
662 if (size > offset + to) {
663 if (size < offset + PAGE_CACHE_SIZE)
664 tmp = size & ~PAGE_CACHE_MASK;
665 else
666 tmp = PAGE_CACHE_SIZE;
667 err = affs_do_readpage_ofs(file, page, to, tmp);
668 }
669 }
670 return err;
671}
672
673static int affs_commit_write_ofs(struct file *file, struct page *page, unsigned from, unsigned to)
674{
675 struct inode *inode = page->mapping->host;
676 struct super_block *sb = inode->i_sb;
677 struct buffer_head *bh, *prev_bh;
678 char *data;
679 u32 bidx, boff, bsize;
680 u32 tmp;
681 int written;
682
683 pr_debug("AFFS: commit_write(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to);
684 bsize = AFFS_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);
697 if (boff + tmp > bsize || tmp > bsize)
698 BUG();
699 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
700 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(be32_to_cpu(AFFS_DATA_HEAD(bh)->size) + tmp);
701 affs_fix_checksum(sb, bh);
702 mark_buffer_dirty_inode(bh, inode);
703 written += tmp;
704 from += tmp;
705 bidx++;
706 } else if (bidx) {
707 bh = affs_bread_ino(inode, bidx - 1, 0);
708 if (IS_ERR(bh))
709 return PTR_ERR(bh);
710 }
711 while (from + bsize <= to) {
712 prev_bh = bh;
713 bh = affs_getemptyblk_ino(inode, bidx);
714 if (IS_ERR(bh))
715 goto out;
716 memcpy(AFFS_DATA(bh), data + from, bsize);
717 if (bh->b_state & (1UL << BH_New)) {
718 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
719 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
720 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
721 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
722 AFFS_DATA_HEAD(bh)->next = 0;
723 bh->b_state &= ~(1UL << BH_New);
724 if (prev_bh) {
725 u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
726 if (tmp)
727 affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp);
728 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
729 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
730 mark_buffer_dirty_inode(prev_bh, inode);
731 }
732 }
733 affs_brelse(prev_bh);
734 affs_fix_checksum(sb, bh);
735 mark_buffer_dirty_inode(bh, inode);
736 written += bsize;
737 from += bsize;
738 bidx++;
739 }
740 if (from < to) {
741 prev_bh = bh;
742 bh = affs_bread_ino(inode, bidx, 1);
743 if (IS_ERR(bh))
744 goto out;
745 tmp = min(bsize, to - from);
746 if (tmp > bsize)
747 BUG();
748 memcpy(AFFS_DATA(bh), data + from, tmp);
749 if (bh->b_state & (1UL << BH_New)) {
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(tmp);
754 AFFS_DATA_HEAD(bh)->next = 0;
755 bh->b_state &= ~(1UL << BH_New);
756 if (prev_bh) {
757 u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
758 if (tmp)
759 affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp);
760 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
761 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
762 mark_buffer_dirty_inode(prev_bh, inode);
763 }
764 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
765 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
766 affs_brelse(prev_bh);
767 affs_fix_checksum(sb, bh);
768 mark_buffer_dirty_inode(bh, inode);
769 written += tmp;
770 from += tmp;
771 bidx++;
772 }
773 SetPageUptodate(page);
774
775done:
776 affs_brelse(bh);
777 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
778 if (tmp > inode->i_size)
779 inode->i_size = AFFS_INODE->mmu_private = tmp;
780
781 return written;
782
783out:
784 bh = prev_bh;
785 if (!written)
786 written = PTR_ERR(bh);
787 goto done;
788}
789
790struct address_space_operations affs_aops_ofs = {
791 readpage: affs_readpage_ofs,
792
793
794 prepare_write: affs_prepare_write_ofs,
795 commit_write: affs_commit_write_ofs
796};
797
798
799
800void
801affs_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 (inode->u.affs_i.i_pa_cnt) {
808 inode->u.affs_i.i_pa_cnt--;
809 affs_free_block(sb, ++inode->u.affs_i.i_lastalloc);
810 }
811}
812
813
814
815void
816affs_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_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->s_data_blksize;
832 ext = last_blk / AFFS_SB->s_hashsize;
833 }
834
835 if (inode->i_size > AFFS_INODE->mmu_private) {
836 struct address_space *mapping = inode->i_mapping;
837 struct page *page;
838 u32 size = inode->i_size - 1;
839 int res;
840
841 page = grab_cache_page(mapping, size >> PAGE_CACHE_SHIFT);
842 if (!page)
843 return;
844 size = (size & (PAGE_CACHE_SIZE - 1)) + 1;
845 res = mapping->a_ops->prepare_write(NULL, page, size, size);
846 if (!res)
847 res = mapping->a_ops->commit_write(NULL, page, size, size);
848 UnlockPage(page);
849 page_cache_release(page);
850 mark_inode_dirty(inode);
851 return;
852 } else if (inode->i_size == AFFS_INODE->mmu_private)
853 return;
854
855
856 ext_bh = affs_get_extblock(inode, ext);
857 if (IS_ERR(ext_bh)) {
858 affs_warning(sb, "truncate", "unexpected read error for ext block %u (%d)",
859 ext, PTR_ERR(ext_bh));
860 return;
861 }
862 if (AFFS_INODE->i_lc) {
863
864 i = (ext + 1) >> AFFS_INODE->i_lc_shift;
865 if (AFFS_INODE->i_lc_size > i) {
866 AFFS_INODE->i_lc_size = i;
867 for (; i < AFFS_LC_SIZE; i++)
868 AFFS_INODE->i_lc[i] = 0;
869 }
870
871 for (i = 0; i < AFFS_AC_SIZE; i++)
872 if (AFFS_INODE->i_ac[i].ext >= ext)
873 AFFS_INODE->i_ac[i].ext = 0;
874 }
875 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
876
877 blkcnt = AFFS_INODE->i_blkcnt;
878 i = 0;
879 blk = last_blk;
880 if (inode->i_size) {
881 i = last_blk % AFFS_SB->s_hashsize + 1;
882 blk++;
883 } else
884 AFFS_HEAD(ext_bh)->first_data = 0;
885 size = AFFS_SB->s_hashsize;
886 if (size > blkcnt - blk + i)
887 size = blkcnt - blk + i;
888 for (; i < size; i++, blk++) {
889 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
890 AFFS_BLOCK(sb, ext_bh, i) = 0;
891 }
892 AFFS_TAIL(sb, ext_bh)->extension = 0;
893 affs_fix_checksum(sb, ext_bh);
894 mark_buffer_dirty_inode(ext_bh, inode);
895 affs_brelse(ext_bh);
896
897 if (inode->i_size) {
898 AFFS_INODE->i_blkcnt = last_blk + 1;
899 AFFS_INODE->i_extcnt = ext + 1;
900 if (AFFS_SB->s_flags & SF_OFS) {
901 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
902 u32 tmp;
903 if (IS_ERR(bh)) {
904 affs_warning(sb, "truncate", "unexpected read error for last block %u (%d)",
905 last_blk, PTR_ERR(bh));
906 return;
907 }
908 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
909 AFFS_DATA_HEAD(bh)->next = 0;
910 affs_adjust_checksum(bh, -tmp);
911 affs_brelse(bh);
912 }
913 } else {
914 AFFS_INODE->i_blkcnt = 0;
915 AFFS_INODE->i_extcnt = 1;
916 }
917 AFFS_INODE->mmu_private = inode->i_size;
918
919
920 while (ext_key) {
921 ext_bh = affs_bread(sb, ext_key);
922 size = AFFS_SB->s_hashsize;
923 if (size > blkcnt - blk)
924 size = blkcnt - blk;
925 for (i = 0; i < size; i++, blk++)
926 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
927 affs_free_block(sb, ext_key);
928 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
929 affs_brelse(ext_bh);
930 }
931 affs_free_prealloc(inode);
932}
933
