4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 * (C) 1991 Linus Torvalds - minix filesystem
12 * affs regular file handling primitives
18 #error PAGE_SIZE must be at least 4096
21 static int affs_grow_extcache(struct inode *inode, u32 lc_idx);
22 static struct buffer_head *affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext);
23 static inline struct buffer_head *affs_get_extblock(struct inode *inode, u32 ext);
24 static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
25 static int affs_file_open(struct inode *inode, struct file *filp);
26 static int affs_file_release(struct inode *inode, struct file *filp);
28 const struct file_operations affs_file_operations = {
29 .llseek = generic_file_llseek,
30 .read = new_sync_read,
31 .read_iter = generic_file_read_iter,
32 .write = new_sync_write,
33 .write_iter = generic_file_write_iter,
34 .mmap = generic_file_mmap,
35 .open = affs_file_open,
36 .release = affs_file_release,
37 .fsync = affs_file_fsync,
38 .splice_read = generic_file_splice_read,
41 const struct inode_operations affs_file_inode_operations = {
42 .setattr = affs_notify_change,
46 affs_file_open(struct inode *inode, struct file *filp)
48 pr_debug("open(%lu,%d)\n",
49 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
50 atomic_inc(&AFFS_I(inode)->i_opencnt);
55 affs_file_release(struct inode *inode, struct file *filp)
57 pr_debug("release(%lu, %d)\n",
58 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
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)
64 affs_free_prealloc(inode);
65 mutex_unlock(&inode->i_mutex);
72 affs_grow_extcache(struct inode *inode, u32 lc_idx)
74 struct super_block *sb = inode->i_sb;
75 struct buffer_head *bh;
79 if (!AFFS_I(inode)->i_lc) {
80 char *ptr = (char *)get_zeroed_page(GFP_NOFS);
83 AFFS_I(inode)->i_lc = (u32 *)ptr;
84 AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2);
87 lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift;
89 if (AFFS_I(inode)->i_extcnt > lc_max) {
90 u32 lc_shift, lc_mask, tmp, off;
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)
97 lc_mask = (1 << lc_shift) - 1;
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);
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];
108 AFFS_I(inode)->i_lc_shift = lc_shift;
109 AFFS_I(inode)->i_lc_mask = lc_mask;
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++) {
117 AFFS_I(inode)->i_lc[0] = inode->i_ino;
120 key = AFFS_I(inode)->i_lc[i - 1];
121 j = AFFS_I(inode)->i_lc_mask + 1;
124 bh = affs_bread(sb, key);
127 key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
131 AFFS_I(inode)->i_lc[i] = key;
141 static struct buffer_head *
142 affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext)
144 struct super_block *sb = inode->i_sb;
145 struct buffer_head *new_bh;
148 blocknr = affs_alloc_block(inode, bh->b_blocknr);
150 return ERR_PTR(-ENOSPC);
152 new_bh = affs_getzeroblk(sb, blocknr);
154 affs_free_block(sb, blocknr);
155 return ERR_PTR(-EIO);
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);
164 mark_buffer_dirty_inode(new_bh, inode);
166 tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
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);
173 AFFS_I(inode)->i_extcnt++;
174 mark_inode_dirty(inode);
179 static inline struct buffer_head *
180 affs_get_extblock(struct inode *inode, u32 ext)
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)
187 /* we have to do more (not inlined) */
188 bh = affs_get_extblock_slow(inode, ext);
193 static struct buffer_head *
194 affs_get_extblock_slow(struct inode *inode, u32 ext)
196 struct super_block *sb = inode->i_sb;
197 struct buffer_head *bh;
199 u32 lc_idx, lc_off, ac_idx;
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)
208 if (ext > AFFS_I(inode)->i_extcnt)
210 bh = affs_alloc_extblock(inode, bh, ext);
217 /* we seek back to the file header block */
218 ext_key = inode->i_ino;
222 if (ext >= AFFS_I(inode)->i_extcnt) {
223 struct buffer_head *prev_bh;
225 /* allocate a new extended block */
226 if (ext > AFFS_I(inode)->i_extcnt)
229 /* get previous extended block */
230 prev_bh = affs_get_extblock(inode, ext - 1);
233 bh = affs_alloc_extblock(inode, prev_bh, ext);
234 affs_brelse(prev_bh);
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;
245 if (lc_idx >= AFFS_I(inode)->i_lc_size) {
248 err = affs_grow_extcache(inode, lc_idx);
254 /* every n'th key we find in the linear cache */
256 ext_key = AFFS_I(inode)->i_lc[lc_idx];
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;
267 /* try to find one of the previous extended blocks */
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;
278 /* fall back to the linear cache */
279 ext_key = AFFS_I(inode)->i_lc[lc_idx];
281 /* read all extended blocks until we find the one we need */
284 bh = affs_bread(sb, ext_key);
287 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
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;
299 /* finally read the right extended block */
301 bh = affs_bread(sb, ext_key);
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;
317 return ERR_PTR(-EIO);
321 affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
323 struct super_block *sb = inode->i_sb;
324 struct buffer_head *ext_bh;
327 pr_debug("%s(%u, %lu)\n",
328 __func__, (u32)inode->i_ino, (unsigned long)block);
330 BUG_ON(block > (sector_t)0x7fffffffUL);
332 if (block >= AFFS_I(inode)->i_blkcnt) {
333 if (block > AFFS_I(inode)->i_blkcnt || !create)
339 affs_lock_ext(inode);
341 ext = (u32)block / AFFS_SB(sb)->s_hashsize;
342 block -= ext * AFFS_SB(sb)->s_hashsize;
343 ext_bh = affs_get_extblock(inode, ext);
346 map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block)));
349 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
352 set_buffer_new(bh_result);
353 AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize;
354 AFFS_I(inode)->i_blkcnt++;
356 /* store new block */
357 if (bh_result->b_blocknr)
358 affs_warning(sb, "get_block", "block already set (%x)", bh_result->b_blocknr);
359 AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr);
360 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1);
361 affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1);
362 bh_result->b_blocknr = blocknr;
365 /* insert first block into header block */
366 u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data);
368 affs_warning(sb, "get_block", "first block already set (%d)", tmp);
369 AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr);
370 affs_adjust_checksum(ext_bh, blocknr - tmp);
376 affs_unlock_ext(inode);
380 affs_error(inode->i_sb,"get_block","strange block request %d", block);
384 affs_unlock_ext(inode);
385 return PTR_ERR(ext_bh);
388 clear_buffer_mapped(bh_result);
389 bh_result->b_bdev = NULL;
391 affs_unlock_ext(inode);
395 static int affs_writepage(struct page *page, struct writeback_control *wbc)
397 return block_write_full_page(page, affs_get_block, wbc);
400 static int affs_readpage(struct file *file, struct page *page)
402 return block_read_full_page(page, affs_get_block);
405 static void affs_write_failed(struct address_space *mapping, loff_t to)
407 struct inode *inode = mapping->host;
409 if (to > inode->i_size) {
410 truncate_pagecache(inode, inode->i_size);
411 affs_truncate(inode);
415 static int affs_write_begin(struct file *file, struct address_space *mapping,
416 loff_t pos, unsigned len, unsigned flags,
417 struct page **pagep, void **fsdata)
422 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
424 &AFFS_I(mapping->host)->mmu_private);
426 affs_write_failed(mapping, pos + len);
431 static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
433 return generic_block_bmap(mapping,block,affs_get_block);
436 const struct address_space_operations affs_aops = {
437 .readpage = affs_readpage,
438 .writepage = affs_writepage,
439 .write_begin = affs_write_begin,
440 .write_end = generic_write_end,
444 static inline struct buffer_head *
445 affs_bread_ino(struct inode *inode, int block, int create)
447 struct buffer_head *bh, tmp_bh;
451 err = affs_get_block(inode, block, &tmp_bh, create);
453 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
455 bh->b_state |= tmp_bh.b_state;
463 static inline struct buffer_head *
464 affs_getzeroblk_ino(struct inode *inode, int block)
466 struct buffer_head *bh, tmp_bh;
470 err = affs_get_block(inode, block, &tmp_bh, 1);
472 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
474 bh->b_state |= tmp_bh.b_state;
482 static inline struct buffer_head *
483 affs_getemptyblk_ino(struct inode *inode, int block)
485 struct buffer_head *bh, tmp_bh;
489 err = affs_get_block(inode, block, &tmp_bh, 1);
491 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
493 bh->b_state |= tmp_bh.b_state;
502 affs_do_readpage_ofs(struct page *page, unsigned to)
504 struct inode *inode = page->mapping->host;
505 struct super_block *sb = inode->i_sb;
506 struct buffer_head *bh;
509 u32 bidx, boff, bsize;
512 pr_debug("%s(%u, %ld, 0, %d)\n", __func__, (u32)inode->i_ino,
514 BUG_ON(to > PAGE_CACHE_SIZE);
516 data = page_address(page);
517 bsize = AFFS_SB(sb)->s_data_blksize;
518 tmp = page->index << PAGE_CACHE_SHIFT;
523 bh = affs_bread_ino(inode, bidx, 0);
526 tmp = min(bsize - boff, to - pos);
527 BUG_ON(pos + tmp > to || tmp > bsize);
528 memcpy(data + pos, AFFS_DATA(bh) + boff, tmp);
534 flush_dcache_page(page);
540 affs_extent_file_ofs(struct inode *inode, u32 newsize)
542 struct super_block *sb = inode->i_sb;
543 struct buffer_head *bh, *prev_bh;
548 pr_debug("%s(%u, %d)\n", __func__, (u32)inode->i_ino, newsize);
549 bsize = AFFS_SB(sb)->s_data_blksize;
551 size = AFFS_I(inode)->mmu_private;
555 bh = affs_bread_ino(inode, bidx, 0);
558 tmp = min(bsize - boff, newsize - size);
559 BUG_ON(boff + tmp > bsize || tmp > bsize);
560 memset(AFFS_DATA(bh) + boff, 0, tmp);
561 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
562 affs_fix_checksum(sb, bh);
563 mark_buffer_dirty_inode(bh, inode);
567 bh = affs_bread_ino(inode, bidx - 1, 0);
572 while (size < newsize) {
574 bh = affs_getzeroblk_ino(inode, bidx);
577 tmp = min(bsize, newsize - size);
579 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
580 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
581 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
582 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
583 affs_fix_checksum(sb, bh);
584 bh->b_state &= ~(1UL << BH_New);
585 mark_buffer_dirty_inode(bh, inode);
587 u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
589 affs_warning(sb, "extent_file_ofs", "next block already set for %d (%d)", bidx, tmp);
590 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
591 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
592 mark_buffer_dirty_inode(prev_bh, inode);
593 affs_brelse(prev_bh);
599 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
603 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
608 affs_readpage_ofs(struct file *file, struct page *page)
610 struct inode *inode = page->mapping->host;
614 pr_debug("%s(%u, %ld)\n", __func__, (u32)inode->i_ino, page->index);
615 to = PAGE_CACHE_SIZE;
616 if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) {
617 to = inode->i_size & ~PAGE_CACHE_MASK;
618 memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to);
621 err = affs_do_readpage_ofs(page, to);
623 SetPageUptodate(page);
628 static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
629 loff_t pos, unsigned len, unsigned flags,
630 struct page **pagep, void **fsdata)
632 struct inode *inode = mapping->host;
637 pr_debug("%s(%u, %llu, %llu)\n", __func__, (u32)inode->i_ino,
638 (unsigned long long)pos, (unsigned long long)pos + len);
639 if (pos > AFFS_I(inode)->mmu_private) {
640 /* XXX: this probably leaves a too-big i_size in case of
641 * failure. Should really be updating i_size at write_end time
643 err = affs_extent_file_ofs(inode, pos);
648 index = pos >> PAGE_CACHE_SHIFT;
649 page = grab_cache_page_write_begin(mapping, index, flags);
654 if (PageUptodate(page))
657 /* XXX: inefficient but safe in the face of short writes */
658 err = affs_do_readpage_ofs(page, PAGE_CACHE_SIZE);
661 page_cache_release(page);
666 static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
667 loff_t pos, unsigned len, unsigned copied,
668 struct page *page, void *fsdata)
670 struct inode *inode = mapping->host;
671 struct super_block *sb = inode->i_sb;
672 struct buffer_head *bh, *prev_bh;
674 u32 bidx, boff, bsize;
679 from = pos & (PAGE_CACHE_SIZE - 1);
682 * XXX: not sure if this can handle short copies (len < copied), but
683 * we don't have to, because the page should always be uptodate here,
684 * due to write_begin.
687 pr_debug("%s(%u, %llu, %llu)\n",
688 __func__, (u32)inode->i_ino, (unsigned long long)pos,
689 (unsigned long long)pos + len);
690 bsize = AFFS_SB(sb)->s_data_blksize;
691 data = page_address(page);
695 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
699 bh = affs_bread_ino(inode, bidx, 0);
702 tmp = min(bsize - boff, to - from);
703 BUG_ON(boff + tmp > bsize || tmp > bsize);
704 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
705 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
706 affs_fix_checksum(sb, bh);
707 mark_buffer_dirty_inode(bh, inode);
712 bh = affs_bread_ino(inode, bidx - 1, 0);
716 while (from + bsize <= to) {
718 bh = affs_getemptyblk_ino(inode, bidx);
721 memcpy(AFFS_DATA(bh), data + from, bsize);
722 if (buffer_new(bh)) {
723 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
724 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
725 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
726 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
727 AFFS_DATA_HEAD(bh)->next = 0;
728 bh->b_state &= ~(1UL << BH_New);
730 u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
732 affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp);
733 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
734 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
735 mark_buffer_dirty_inode(prev_bh, inode);
738 affs_brelse(prev_bh);
739 affs_fix_checksum(sb, bh);
740 mark_buffer_dirty_inode(bh, inode);
747 bh = affs_bread_ino(inode, bidx, 1);
750 tmp = min(bsize, to - from);
752 memcpy(AFFS_DATA(bh), data + from, tmp);
753 if (buffer_new(bh)) {
754 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
755 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
756 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
757 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
758 AFFS_DATA_HEAD(bh)->next = 0;
759 bh->b_state &= ~(1UL << BH_New);
761 u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
763 affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp);
764 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
765 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
766 mark_buffer_dirty_inode(prev_bh, inode);
768 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
769 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
770 affs_brelse(prev_bh);
771 affs_fix_checksum(sb, bh);
772 mark_buffer_dirty_inode(bh, inode);
777 SetPageUptodate(page);
781 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
782 if (tmp > inode->i_size)
783 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
786 page_cache_release(page);
793 written = PTR_ERR(bh);
797 const struct address_space_operations affs_aops_ofs = {
798 .readpage = affs_readpage_ofs,
799 //.writepage = affs_writepage_ofs,
800 .write_begin = affs_write_begin_ofs,
801 .write_end = affs_write_end_ofs
804 /* Free any preallocated blocks. */
807 affs_free_prealloc(struct inode *inode)
809 struct super_block *sb = inode->i_sb;
811 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
813 while (AFFS_I(inode)->i_pa_cnt) {
814 AFFS_I(inode)->i_pa_cnt--;
815 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
819 /* Truncate (or enlarge) a file to the requested size. */
822 affs_truncate(struct inode *inode)
824 struct super_block *sb = inode->i_sb;
826 u32 last_blk, blkcnt, blk;
828 struct buffer_head *ext_bh;
831 pr_debug("truncate(inode=%d, oldsize=%u, newsize=%u)\n",
832 (u32)inode->i_ino, (u32)AFFS_I(inode)->mmu_private, (u32)inode->i_size);
837 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
838 ext = last_blk / AFFS_SB(sb)->s_hashsize;
841 if (inode->i_size > AFFS_I(inode)->mmu_private) {
842 struct address_space *mapping = inode->i_mapping;
845 loff_t size = inode->i_size;
848 res = mapping->a_ops->write_begin(NULL, mapping, size, 0, 0, &page, &fsdata);
850 res = mapping->a_ops->write_end(NULL, mapping, size, 0, 0, page, fsdata);
852 inode->i_size = AFFS_I(inode)->mmu_private;
853 mark_inode_dirty(inode);
855 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
859 ext_bh = affs_get_extblock(inode, ext);
860 if (IS_ERR(ext_bh)) {
861 affs_warning(sb, "truncate", "unexpected read error for ext block %u (%d)",
862 ext, PTR_ERR(ext_bh));
865 if (AFFS_I(inode)->i_lc) {
866 /* clear linear cache */
867 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
868 if (AFFS_I(inode)->i_lc_size > i) {
869 AFFS_I(inode)->i_lc_size = i;
870 for (; i < AFFS_LC_SIZE; i++)
871 AFFS_I(inode)->i_lc[i] = 0;
873 /* clear associative cache */
874 for (i = 0; i < AFFS_AC_SIZE; i++)
875 if (AFFS_I(inode)->i_ac[i].ext >= ext)
876 AFFS_I(inode)->i_ac[i].ext = 0;
878 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
880 blkcnt = AFFS_I(inode)->i_blkcnt;
884 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
887 AFFS_HEAD(ext_bh)->first_data = 0;
888 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
889 size = AFFS_SB(sb)->s_hashsize;
890 if (size > blkcnt - blk + i)
891 size = blkcnt - blk + i;
892 for (; i < size; i++, blk++) {
893 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
894 AFFS_BLOCK(sb, ext_bh, i) = 0;
896 AFFS_TAIL(sb, ext_bh)->extension = 0;
897 affs_fix_checksum(sb, ext_bh);
898 mark_buffer_dirty_inode(ext_bh, inode);
902 AFFS_I(inode)->i_blkcnt = last_blk + 1;
903 AFFS_I(inode)->i_extcnt = ext + 1;
904 if (AFFS_SB(sb)->s_flags & SF_OFS) {
905 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
908 affs_warning(sb, "truncate", "unexpected read error for last block %u (%d)",
912 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
913 AFFS_DATA_HEAD(bh)->next = 0;
914 affs_adjust_checksum(bh, -tmp);
918 AFFS_I(inode)->i_blkcnt = 0;
919 AFFS_I(inode)->i_extcnt = 1;
921 AFFS_I(inode)->mmu_private = inode->i_size;
925 ext_bh = affs_bread(sb, ext_key);
926 size = AFFS_SB(sb)->s_hashsize;
927 if (size > blkcnt - blk)
929 for (i = 0; i < size; i++, blk++)
930 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
931 affs_free_block(sb, ext_key);
932 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
935 affs_free_prealloc(inode);
938 int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
940 struct inode *inode = filp->f_mapping->host;
943 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
947 mutex_lock(&inode->i_mutex);
948 ret = write_inode_now(inode, 0);
949 err = sync_blockdev(inode->i_sb->s_bdev);
952 mutex_unlock(&inode->i_mutex);