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
15 #include <linux/aio.h>
18 static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
21 affs_file_open(struct inode *inode, struct file *filp)
23 pr_debug("open(%lu,%d)\n",
24 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
25 atomic_inc(&AFFS_I(inode)->i_opencnt);
30 affs_file_release(struct inode *inode, struct file *filp)
32 pr_debug("release(%lu, %d)\n",
33 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
35 if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) {
36 mutex_lock(&inode->i_mutex);
37 if (inode->i_size != AFFS_I(inode)->mmu_private)
39 affs_free_prealloc(inode);
40 mutex_unlock(&inode->i_mutex);
47 affs_grow_extcache(struct inode *inode, u32 lc_idx)
49 struct super_block *sb = inode->i_sb;
50 struct buffer_head *bh;
54 if (!AFFS_I(inode)->i_lc) {
55 char *ptr = (char *)get_zeroed_page(GFP_NOFS);
58 AFFS_I(inode)->i_lc = (u32 *)ptr;
59 AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2);
62 lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift;
64 if (AFFS_I(inode)->i_extcnt > lc_max) {
65 u32 lc_shift, lc_mask, tmp, off;
67 /* need to recalculate linear cache, start from old size */
68 lc_shift = AFFS_I(inode)->i_lc_shift;
69 tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift;
70 for (; tmp; tmp >>= 1)
72 lc_mask = (1 << lc_shift) - 1;
74 /* fix idx and old size to new shift */
75 lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
76 AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
78 /* first shrink old cache to make more space */
79 off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift);
80 for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off)
81 AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j];
83 AFFS_I(inode)->i_lc_shift = lc_shift;
84 AFFS_I(inode)->i_lc_mask = lc_mask;
87 /* fill cache to the needed index */
88 i = AFFS_I(inode)->i_lc_size;
89 AFFS_I(inode)->i_lc_size = lc_idx + 1;
90 for (; i <= lc_idx; i++) {
92 AFFS_I(inode)->i_lc[0] = inode->i_ino;
95 key = AFFS_I(inode)->i_lc[i - 1];
96 j = AFFS_I(inode)->i_lc_mask + 1;
99 bh = affs_bread(sb, key);
102 key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
106 AFFS_I(inode)->i_lc[i] = key;
116 static struct buffer_head *
117 affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext)
119 struct super_block *sb = inode->i_sb;
120 struct buffer_head *new_bh;
123 blocknr = affs_alloc_block(inode, bh->b_blocknr);
125 return ERR_PTR(-ENOSPC);
127 new_bh = affs_getzeroblk(sb, blocknr);
129 affs_free_block(sb, blocknr);
130 return ERR_PTR(-EIO);
133 AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST);
134 AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr);
135 AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE);
136 AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino);
137 affs_fix_checksum(sb, new_bh);
139 mark_buffer_dirty_inode(new_bh, inode);
141 tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
143 affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp);
144 AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr);
145 affs_adjust_checksum(bh, blocknr - tmp);
146 mark_buffer_dirty_inode(bh, inode);
148 AFFS_I(inode)->i_extcnt++;
149 mark_inode_dirty(inode);
154 static inline struct buffer_head *
155 affs_get_extblock(struct inode *inode, u32 ext)
157 /* inline the simplest case: same extended block as last time */
158 struct buffer_head *bh = AFFS_I(inode)->i_ext_bh;
159 if (ext == AFFS_I(inode)->i_ext_last)
162 /* we have to do more (not inlined) */
163 bh = affs_get_extblock_slow(inode, ext);
168 static struct buffer_head *
169 affs_get_extblock_slow(struct inode *inode, u32 ext)
171 struct super_block *sb = inode->i_sb;
172 struct buffer_head *bh;
174 u32 lc_idx, lc_off, ac_idx;
177 if (ext == AFFS_I(inode)->i_ext_last + 1) {
178 /* read the next extended block from the current one */
179 bh = AFFS_I(inode)->i_ext_bh;
180 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
181 if (ext < AFFS_I(inode)->i_extcnt)
183 BUG_ON(ext > AFFS_I(inode)->i_extcnt);
184 bh = affs_alloc_extblock(inode, bh, ext);
191 /* we seek back to the file header block */
192 ext_key = inode->i_ino;
196 if (ext >= AFFS_I(inode)->i_extcnt) {
197 struct buffer_head *prev_bh;
199 /* allocate a new extended block */
200 BUG_ON(ext > AFFS_I(inode)->i_extcnt);
202 /* get previous extended block */
203 prev_bh = affs_get_extblock(inode, ext - 1);
206 bh = affs_alloc_extblock(inode, prev_bh, ext);
207 affs_brelse(prev_bh);
214 /* check if there is an extended cache and whether it's large enough */
215 lc_idx = ext >> AFFS_I(inode)->i_lc_shift;
216 lc_off = ext & AFFS_I(inode)->i_lc_mask;
218 if (lc_idx >= AFFS_I(inode)->i_lc_size) {
221 err = affs_grow_extcache(inode, lc_idx);
227 /* every n'th key we find in the linear cache */
229 ext_key = AFFS_I(inode)->i_lc[lc_idx];
233 /* maybe it's still in the associative cache */
234 ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK;
235 if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) {
236 ext_key = AFFS_I(inode)->i_ac[ac_idx].key;
240 /* try to find one of the previous extended blocks */
243 while (--tmp, --lc_off > 0) {
244 idx = (idx - 1) & AFFS_AC_MASK;
245 if (AFFS_I(inode)->i_ac[idx].ext == tmp) {
246 ext_key = AFFS_I(inode)->i_ac[idx].key;
251 /* fall back to the linear cache */
252 ext_key = AFFS_I(inode)->i_lc[lc_idx];
254 /* read all extended blocks until we find the one we need */
257 bh = affs_bread(sb, ext_key);
260 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
266 /* store it in the associative cache */
267 // recalculate ac_idx?
268 AFFS_I(inode)->i_ac[ac_idx].ext = ext;
269 AFFS_I(inode)->i_ac[ac_idx].key = ext_key;
272 /* finally read the right extended block */
274 bh = affs_bread(sb, ext_key);
280 /* release old cached extended block and store the new one */
281 affs_brelse(AFFS_I(inode)->i_ext_bh);
282 AFFS_I(inode)->i_ext_last = ext;
283 AFFS_I(inode)->i_ext_bh = bh;
290 return ERR_PTR(-EIO);
294 affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
296 struct super_block *sb = inode->i_sb;
297 struct buffer_head *ext_bh;
300 pr_debug("%s(%lu, %llu)\n", __func__, inode->i_ino,
301 (unsigned long long)block);
303 BUG_ON(block > (sector_t)0x7fffffffUL);
305 if (block >= AFFS_I(inode)->i_blkcnt) {
306 if (block > AFFS_I(inode)->i_blkcnt || !create)
312 affs_lock_ext(inode);
314 ext = (u32)block / AFFS_SB(sb)->s_hashsize;
315 block -= ext * AFFS_SB(sb)->s_hashsize;
316 ext_bh = affs_get_extblock(inode, ext);
319 map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block)));
322 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
325 set_buffer_new(bh_result);
326 AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize;
327 AFFS_I(inode)->i_blkcnt++;
329 /* store new block */
330 if (bh_result->b_blocknr)
331 affs_warning(sb, "get_block",
332 "block already set (%llx)",
333 (unsigned long long)bh_result->b_blocknr);
334 AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr);
335 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1);
336 affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1);
337 bh_result->b_blocknr = blocknr;
340 /* insert first block into header block */
341 u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data);
343 affs_warning(sb, "get_block", "first block already set (%d)", tmp);
344 AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr);
345 affs_adjust_checksum(ext_bh, blocknr - tmp);
351 affs_unlock_ext(inode);
355 affs_error(inode->i_sb, "get_block", "strange block request %llu",
356 (unsigned long long)block);
360 affs_unlock_ext(inode);
361 return PTR_ERR(ext_bh);
364 clear_buffer_mapped(bh_result);
365 bh_result->b_bdev = NULL;
367 affs_unlock_ext(inode);
371 static int affs_writepage(struct page *page, struct writeback_control *wbc)
373 return block_write_full_page(page, affs_get_block, wbc);
376 static int affs_readpage(struct file *file, struct page *page)
378 return block_read_full_page(page, affs_get_block);
381 static void affs_write_failed(struct address_space *mapping, loff_t to)
383 struct inode *inode = mapping->host;
385 if (to > inode->i_size) {
386 truncate_pagecache(inode, inode->i_size);
387 affs_truncate(inode);
392 affs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
395 struct file *file = iocb->ki_filp;
396 struct address_space *mapping = file->f_mapping;
397 struct inode *inode = mapping->host;
398 size_t count = iov_iter_count(iter);
401 ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, affs_get_block);
402 if (ret < 0 && (rw & WRITE))
403 affs_write_failed(mapping, offset + count);
407 static int affs_write_begin(struct file *file, struct address_space *mapping,
408 loff_t pos, unsigned len, unsigned flags,
409 struct page **pagep, void **fsdata)
414 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
416 &AFFS_I(mapping->host)->mmu_private);
418 affs_write_failed(mapping, pos + len);
423 static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
425 return generic_block_bmap(mapping,block,affs_get_block);
428 const struct address_space_operations affs_aops = {
429 .readpage = affs_readpage,
430 .writepage = affs_writepage,
431 .write_begin = affs_write_begin,
432 .write_end = generic_write_end,
433 .direct_IO = affs_direct_IO,
437 static inline struct buffer_head *
438 affs_bread_ino(struct inode *inode, int block, int create)
440 struct buffer_head *bh, tmp_bh;
444 err = affs_get_block(inode, block, &tmp_bh, create);
446 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
448 bh->b_state |= tmp_bh.b_state;
456 static inline struct buffer_head *
457 affs_getzeroblk_ino(struct inode *inode, int block)
459 struct buffer_head *bh, tmp_bh;
463 err = affs_get_block(inode, block, &tmp_bh, 1);
465 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
467 bh->b_state |= tmp_bh.b_state;
475 static inline struct buffer_head *
476 affs_getemptyblk_ino(struct inode *inode, int block)
478 struct buffer_head *bh, tmp_bh;
482 err = affs_get_block(inode, block, &tmp_bh, 1);
484 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
486 bh->b_state |= tmp_bh.b_state;
495 affs_do_readpage_ofs(struct page *page, unsigned to)
497 struct inode *inode = page->mapping->host;
498 struct super_block *sb = inode->i_sb;
499 struct buffer_head *bh;
502 u32 bidx, boff, bsize;
505 pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino,
507 BUG_ON(to > PAGE_CACHE_SIZE);
509 data = page_address(page);
510 bsize = AFFS_SB(sb)->s_data_blksize;
511 tmp = page->index << PAGE_CACHE_SHIFT;
516 bh = affs_bread_ino(inode, bidx, 0);
519 tmp = min(bsize - boff, to - pos);
520 BUG_ON(pos + tmp > to || tmp > bsize);
521 memcpy(data + pos, AFFS_DATA(bh) + boff, tmp);
527 flush_dcache_page(page);
533 affs_extent_file_ofs(struct inode *inode, u32 newsize)
535 struct super_block *sb = inode->i_sb;
536 struct buffer_head *bh, *prev_bh;
541 pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize);
542 bsize = AFFS_SB(sb)->s_data_blksize;
544 size = AFFS_I(inode)->mmu_private;
548 bh = affs_bread_ino(inode, bidx, 0);
551 tmp = min(bsize - boff, newsize - size);
552 BUG_ON(boff + tmp > bsize || tmp > bsize);
553 memset(AFFS_DATA(bh) + boff, 0, tmp);
554 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
555 affs_fix_checksum(sb, bh);
556 mark_buffer_dirty_inode(bh, inode);
560 bh = affs_bread_ino(inode, bidx - 1, 0);
565 while (size < newsize) {
567 bh = affs_getzeroblk_ino(inode, bidx);
570 tmp = min(bsize, newsize - size);
572 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
573 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
574 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
575 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
576 affs_fix_checksum(sb, bh);
577 bh->b_state &= ~(1UL << BH_New);
578 mark_buffer_dirty_inode(bh, inode);
580 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
583 affs_warning(sb, "extent_file_ofs",
584 "next block already set for %d (%d)",
586 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
587 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
588 mark_buffer_dirty_inode(prev_bh, inode);
589 affs_brelse(prev_bh);
595 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
599 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
604 affs_readpage_ofs(struct file *file, struct page *page)
606 struct inode *inode = page->mapping->host;
610 pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index);
611 to = PAGE_CACHE_SIZE;
612 if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) {
613 to = inode->i_size & ~PAGE_CACHE_MASK;
614 memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to);
617 err = affs_do_readpage_ofs(page, to);
619 SetPageUptodate(page);
624 static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
625 loff_t pos, unsigned len, unsigned flags,
626 struct page **pagep, void **fsdata)
628 struct inode *inode = mapping->host;
633 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
635 if (pos > AFFS_I(inode)->mmu_private) {
636 /* XXX: this probably leaves a too-big i_size in case of
637 * failure. Should really be updating i_size at write_end time
639 err = affs_extent_file_ofs(inode, pos);
644 index = pos >> PAGE_CACHE_SHIFT;
645 page = grab_cache_page_write_begin(mapping, index, flags);
650 if (PageUptodate(page))
653 /* XXX: inefficient but safe in the face of short writes */
654 err = affs_do_readpage_ofs(page, PAGE_CACHE_SIZE);
657 page_cache_release(page);
662 static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
663 loff_t pos, unsigned len, unsigned copied,
664 struct page *page, void *fsdata)
666 struct inode *inode = mapping->host;
667 struct super_block *sb = inode->i_sb;
668 struct buffer_head *bh, *prev_bh;
670 u32 bidx, boff, bsize;
675 from = pos & (PAGE_CACHE_SIZE - 1);
678 * XXX: not sure if this can handle short copies (len < copied), but
679 * we don't have to, because the page should always be uptodate here,
680 * due to write_begin.
683 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
685 bsize = AFFS_SB(sb)->s_data_blksize;
686 data = page_address(page);
690 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
694 bh = affs_bread_ino(inode, bidx, 0);
697 tmp = min(bsize - boff, to - from);
698 BUG_ON(boff + tmp > bsize || tmp > bsize);
699 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
700 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
701 affs_fix_checksum(sb, bh);
702 mark_buffer_dirty_inode(bh, inode);
707 bh = affs_bread_ino(inode, bidx - 1, 0);
711 while (from + bsize <= to) {
713 bh = affs_getemptyblk_ino(inode, bidx);
716 memcpy(AFFS_DATA(bh), data + from, bsize);
717 if (buffer_new(bh)) {
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);
725 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
728 affs_warning(sb, "commit_write_ofs",
729 "next block already set for %d (%d)",
731 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
732 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
733 mark_buffer_dirty_inode(prev_bh, inode);
736 affs_brelse(prev_bh);
737 affs_fix_checksum(sb, bh);
738 mark_buffer_dirty_inode(bh, inode);
745 bh = affs_bread_ino(inode, bidx, 1);
748 tmp = min(bsize, to - from);
750 memcpy(AFFS_DATA(bh), data + from, tmp);
751 if (buffer_new(bh)) {
752 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
753 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
754 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
755 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
756 AFFS_DATA_HEAD(bh)->next = 0;
757 bh->b_state &= ~(1UL << BH_New);
759 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
762 affs_warning(sb, "commit_write_ofs",
763 "next block already set for %d (%d)",
765 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
766 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
767 mark_buffer_dirty_inode(prev_bh, inode);
769 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
770 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
771 affs_brelse(prev_bh);
772 affs_fix_checksum(sb, bh);
773 mark_buffer_dirty_inode(bh, inode);
778 SetPageUptodate(page);
782 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
783 if (tmp > inode->i_size)
784 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
787 page_cache_release(page);
794 written = PTR_ERR(bh);
798 const struct address_space_operations affs_aops_ofs = {
799 .readpage = affs_readpage_ofs,
800 //.writepage = affs_writepage_ofs,
801 .write_begin = affs_write_begin_ofs,
802 .write_end = affs_write_end_ofs
805 /* Free any preallocated blocks. */
808 affs_free_prealloc(struct inode *inode)
810 struct super_block *sb = inode->i_sb;
812 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
814 while (AFFS_I(inode)->i_pa_cnt) {
815 AFFS_I(inode)->i_pa_cnt--;
816 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
820 /* Truncate (or enlarge) a file to the requested size. */
823 affs_truncate(struct inode *inode)
825 struct super_block *sb = inode->i_sb;
827 u32 last_blk, blkcnt, blk;
829 struct buffer_head *ext_bh;
832 pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n",
833 inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size);
838 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
839 ext = last_blk / AFFS_SB(sb)->s_hashsize;
842 if (inode->i_size > AFFS_I(inode)->mmu_private) {
843 struct address_space *mapping = inode->i_mapping;
846 loff_t isize = inode->i_size;
849 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata);
851 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata);
853 inode->i_size = AFFS_I(inode)->mmu_private;
854 mark_inode_dirty(inode);
856 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
860 ext_bh = affs_get_extblock(inode, ext);
861 if (IS_ERR(ext_bh)) {
862 affs_warning(sb, "truncate",
863 "unexpected read error for ext block %u (%ld)",
864 ext, PTR_ERR(ext_bh));
867 if (AFFS_I(inode)->i_lc) {
868 /* clear linear cache */
869 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
870 if (AFFS_I(inode)->i_lc_size > i) {
871 AFFS_I(inode)->i_lc_size = i;
872 for (; i < AFFS_LC_SIZE; i++)
873 AFFS_I(inode)->i_lc[i] = 0;
875 /* clear associative cache */
876 for (i = 0; i < AFFS_AC_SIZE; i++)
877 if (AFFS_I(inode)->i_ac[i].ext >= ext)
878 AFFS_I(inode)->i_ac[i].ext = 0;
880 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
882 blkcnt = AFFS_I(inode)->i_blkcnt;
886 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
889 AFFS_HEAD(ext_bh)->first_data = 0;
890 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
891 size = AFFS_SB(sb)->s_hashsize;
892 if (size > blkcnt - blk + i)
893 size = blkcnt - blk + i;
894 for (; i < size; i++, blk++) {
895 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
896 AFFS_BLOCK(sb, ext_bh, i) = 0;
898 AFFS_TAIL(sb, ext_bh)->extension = 0;
899 affs_fix_checksum(sb, ext_bh);
900 mark_buffer_dirty_inode(ext_bh, inode);
904 AFFS_I(inode)->i_blkcnt = last_blk + 1;
905 AFFS_I(inode)->i_extcnt = ext + 1;
906 if (AFFS_SB(sb)->s_flags & SF_OFS) {
907 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
910 affs_warning(sb, "truncate",
911 "unexpected read error for last block %u (%ld)",
915 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
916 AFFS_DATA_HEAD(bh)->next = 0;
917 affs_adjust_checksum(bh, -tmp);
921 AFFS_I(inode)->i_blkcnt = 0;
922 AFFS_I(inode)->i_extcnt = 1;
924 AFFS_I(inode)->mmu_private = inode->i_size;
928 ext_bh = affs_bread(sb, ext_key);
929 size = AFFS_SB(sb)->s_hashsize;
930 if (size > blkcnt - blk)
932 for (i = 0; i < size; i++, blk++)
933 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
934 affs_free_block(sb, ext_key);
935 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
938 affs_free_prealloc(inode);
941 int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
943 struct inode *inode = filp->f_mapping->host;
946 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
950 mutex_lock(&inode->i_mutex);
951 ret = write_inode_now(inode, 0);
952 err = sync_blockdev(inode->i_sb->s_bdev);
955 mutex_unlock(&inode->i_mutex);
958 const struct file_operations affs_file_operations = {
959 .llseek = generic_file_llseek,
960 .read = new_sync_read,
961 .read_iter = generic_file_read_iter,
962 .write = new_sync_write,
963 .write_iter = generic_file_write_iter,
964 .mmap = generic_file_mmap,
965 .open = affs_file_open,
966 .release = affs_file_release,
967 .fsync = affs_file_fsync,
968 .splice_read = generic_file_splice_read,
971 const struct inode_operations affs_file_inode_operations = {
972 .setattr = affs_notify_change,