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 if (ext > AFFS_I(inode)->i_extcnt)
185 bh = affs_alloc_extblock(inode, bh, ext);
192 /* we seek back to the file header block */
193 ext_key = inode->i_ino;
197 if (ext >= AFFS_I(inode)->i_extcnt) {
198 struct buffer_head *prev_bh;
200 /* allocate a new extended block */
201 if (ext > AFFS_I(inode)->i_extcnt)
204 /* get previous extended block */
205 prev_bh = affs_get_extblock(inode, ext - 1);
208 bh = affs_alloc_extblock(inode, prev_bh, ext);
209 affs_brelse(prev_bh);
216 /* check if there is an extended cache and whether it's large enough */
217 lc_idx = ext >> AFFS_I(inode)->i_lc_shift;
218 lc_off = ext & AFFS_I(inode)->i_lc_mask;
220 if (lc_idx >= AFFS_I(inode)->i_lc_size) {
223 err = affs_grow_extcache(inode, lc_idx);
229 /* every n'th key we find in the linear cache */
231 ext_key = AFFS_I(inode)->i_lc[lc_idx];
235 /* maybe it's still in the associative cache */
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;
242 /* try to find one of the previous extended blocks */
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;
253 /* fall back to the linear cache */
254 ext_key = AFFS_I(inode)->i_lc[lc_idx];
256 /* read all extended blocks until we find the one we need */
259 bh = affs_bread(sb, ext_key);
262 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
268 /* store it in the associative cache */
269 // recalculate ac_idx?
270 AFFS_I(inode)->i_ac[ac_idx].ext = ext;
271 AFFS_I(inode)->i_ac[ac_idx].key = ext_key;
274 /* finally read the right extended block */
276 bh = affs_bread(sb, ext_key);
282 /* release old cached extended block and store the new one */
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;
292 return ERR_PTR(-EIO);
296 affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
298 struct super_block *sb = inode->i_sb;
299 struct buffer_head *ext_bh;
302 pr_debug("%s(%u, %lu)\n",
303 __func__, (u32)inode->i_ino, (unsigned long)block);
305 BUG_ON(block > (sector_t)0x7fffffffUL);
307 if (block >= AFFS_I(inode)->i_blkcnt) {
308 if (block > AFFS_I(inode)->i_blkcnt || !create)
314 affs_lock_ext(inode);
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);
321 map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block)));
324 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
327 set_buffer_new(bh_result);
328 AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize;
329 AFFS_I(inode)->i_blkcnt++;
331 /* store new block */
332 if (bh_result->b_blocknr)
333 affs_warning(sb, "get_block", "block already set (%lx)",
334 (unsigned long)bh_result->b_blocknr);
335 AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr);
336 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1);
337 affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1);
338 bh_result->b_blocknr = blocknr;
341 /* insert first block into header block */
342 u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data);
344 affs_warning(sb, "get_block", "first block already set (%d)", tmp);
345 AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr);
346 affs_adjust_checksum(ext_bh, blocknr - tmp);
352 affs_unlock_ext(inode);
356 affs_error(inode->i_sb, "get_block", "strange block request %d",
361 affs_unlock_ext(inode);
362 return PTR_ERR(ext_bh);
365 clear_buffer_mapped(bh_result);
366 bh_result->b_bdev = NULL;
368 affs_unlock_ext(inode);
372 static int affs_writepage(struct page *page, struct writeback_control *wbc)
374 return block_write_full_page(page, affs_get_block, wbc);
377 static int affs_readpage(struct file *file, struct page *page)
379 return block_read_full_page(page, affs_get_block);
382 static void affs_write_failed(struct address_space *mapping, loff_t to)
384 struct inode *inode = mapping->host;
386 if (to > inode->i_size) {
387 truncate_pagecache(inode, inode->i_size);
388 affs_truncate(inode);
393 affs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
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);
402 ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, affs_get_block);
403 if (ret < 0 && (rw & WRITE))
404 affs_write_failed(mapping, offset + count);
408 static int affs_write_begin(struct file *file, struct address_space *mapping,
409 loff_t pos, unsigned len, unsigned flags,
410 struct page **pagep, void **fsdata)
415 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
417 &AFFS_I(mapping->host)->mmu_private);
419 affs_write_failed(mapping, pos + len);
424 static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
426 return generic_block_bmap(mapping,block,affs_get_block);
429 const struct address_space_operations affs_aops = {
430 .readpage = affs_readpage,
431 .writepage = affs_writepage,
432 .write_begin = affs_write_begin,
433 .write_end = generic_write_end,
434 .direct_IO = affs_direct_IO,
438 static inline struct buffer_head *
439 affs_bread_ino(struct inode *inode, int block, int create)
441 struct buffer_head *bh, tmp_bh;
445 err = affs_get_block(inode, block, &tmp_bh, create);
447 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
449 bh->b_state |= tmp_bh.b_state;
457 static inline struct buffer_head *
458 affs_getzeroblk_ino(struct inode *inode, int block)
460 struct buffer_head *bh, tmp_bh;
464 err = affs_get_block(inode, block, &tmp_bh, 1);
466 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
468 bh->b_state |= tmp_bh.b_state;
476 static inline struct buffer_head *
477 affs_getemptyblk_ino(struct inode *inode, int block)
479 struct buffer_head *bh, tmp_bh;
483 err = affs_get_block(inode, block, &tmp_bh, 1);
485 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
487 bh->b_state |= tmp_bh.b_state;
496 affs_do_readpage_ofs(struct page *page, unsigned to)
498 struct inode *inode = page->mapping->host;
499 struct super_block *sb = inode->i_sb;
500 struct buffer_head *bh;
503 u32 bidx, boff, bsize;
506 pr_debug("%s(%u, %ld, 0, %d)\n", __func__, (u32)inode->i_ino,
508 BUG_ON(to > PAGE_CACHE_SIZE);
510 data = page_address(page);
511 bsize = AFFS_SB(sb)->s_data_blksize;
512 tmp = page->index << PAGE_CACHE_SHIFT;
517 bh = affs_bread_ino(inode, bidx, 0);
520 tmp = min(bsize - boff, to - pos);
521 BUG_ON(pos + tmp > to || tmp > bsize);
522 memcpy(data + pos, AFFS_DATA(bh) + boff, tmp);
528 flush_dcache_page(page);
534 affs_extent_file_ofs(struct inode *inode, u32 newsize)
536 struct super_block *sb = inode->i_sb;
537 struct buffer_head *bh, *prev_bh;
542 pr_debug("%s(%u, %d)\n", __func__, (u32)inode->i_ino, newsize);
543 bsize = AFFS_SB(sb)->s_data_blksize;
545 size = AFFS_I(inode)->mmu_private;
549 bh = affs_bread_ino(inode, bidx, 0);
552 tmp = min(bsize - boff, newsize - size);
553 BUG_ON(boff + tmp > bsize || tmp > bsize);
554 memset(AFFS_DATA(bh) + boff, 0, tmp);
555 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
556 affs_fix_checksum(sb, bh);
557 mark_buffer_dirty_inode(bh, inode);
561 bh = affs_bread_ino(inode, bidx - 1, 0);
566 while (size < newsize) {
568 bh = affs_getzeroblk_ino(inode, bidx);
571 tmp = min(bsize, newsize - size);
573 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
574 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
575 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
576 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
577 affs_fix_checksum(sb, bh);
578 bh->b_state &= ~(1UL << BH_New);
579 mark_buffer_dirty_inode(bh, inode);
581 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
584 affs_warning(sb, "extent_file_ofs",
585 "next block already set for %d (%d)",
587 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
588 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
589 mark_buffer_dirty_inode(prev_bh, inode);
590 affs_brelse(prev_bh);
596 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
600 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
605 affs_readpage_ofs(struct file *file, struct page *page)
607 struct inode *inode = page->mapping->host;
611 pr_debug("%s(%u, %ld)\n", __func__, (u32)inode->i_ino, page->index);
612 to = PAGE_CACHE_SIZE;
613 if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) {
614 to = inode->i_size & ~PAGE_CACHE_MASK;
615 memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to);
618 err = affs_do_readpage_ofs(page, to);
620 SetPageUptodate(page);
625 static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
626 loff_t pos, unsigned len, unsigned flags,
627 struct page **pagep, void **fsdata)
629 struct inode *inode = mapping->host;
634 pr_debug("%s(%u, %llu, %llu)\n", __func__, (u32)inode->i_ino,
635 (unsigned long long)pos, (unsigned long long)pos + len);
636 if (pos > AFFS_I(inode)->mmu_private) {
637 /* XXX: this probably leaves a too-big i_size in case of
638 * failure. Should really be updating i_size at write_end time
640 err = affs_extent_file_ofs(inode, pos);
645 index = pos >> PAGE_CACHE_SHIFT;
646 page = grab_cache_page_write_begin(mapping, index, flags);
651 if (PageUptodate(page))
654 /* XXX: inefficient but safe in the face of short writes */
655 err = affs_do_readpage_ofs(page, PAGE_CACHE_SIZE);
658 page_cache_release(page);
663 static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
664 loff_t pos, unsigned len, unsigned copied,
665 struct page *page, void *fsdata)
667 struct inode *inode = mapping->host;
668 struct super_block *sb = inode->i_sb;
669 struct buffer_head *bh, *prev_bh;
671 u32 bidx, boff, bsize;
676 from = pos & (PAGE_CACHE_SIZE - 1);
679 * XXX: not sure if this can handle short copies (len < copied), but
680 * we don't have to, because the page should always be uptodate here,
681 * due to write_begin.
684 pr_debug("%s(%u, %llu, %llu)\n",
685 __func__, (u32)inode->i_ino, (unsigned long long)pos,
686 (unsigned long long)pos + len);
687 bsize = AFFS_SB(sb)->s_data_blksize;
688 data = page_address(page);
692 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
696 bh = affs_bread_ino(inode, bidx, 0);
699 tmp = min(bsize - boff, to - from);
700 BUG_ON(boff + tmp > bsize || tmp > bsize);
701 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
702 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
703 affs_fix_checksum(sb, bh);
704 mark_buffer_dirty_inode(bh, inode);
709 bh = affs_bread_ino(inode, bidx - 1, 0);
713 while (from + bsize <= to) {
715 bh = affs_getemptyblk_ino(inode, bidx);
718 memcpy(AFFS_DATA(bh), data + from, bsize);
719 if (buffer_new(bh)) {
720 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
721 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
722 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
723 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
724 AFFS_DATA_HEAD(bh)->next = 0;
725 bh->b_state &= ~(1UL << BH_New);
727 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
730 affs_warning(sb, "commit_write_ofs",
731 "next block already set for %d (%d)",
733 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
734 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
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_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
764 affs_warning(sb, "commit_write_ofs",
765 "next block already set for %d (%d)",
767 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
768 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
769 mark_buffer_dirty_inode(prev_bh, inode);
771 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
772 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
773 affs_brelse(prev_bh);
774 affs_fix_checksum(sb, bh);
775 mark_buffer_dirty_inode(bh, inode);
780 SetPageUptodate(page);
784 tmp = (page->index << PAGE_CACHE_SHIFT) + from;
785 if (tmp > inode->i_size)
786 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
789 page_cache_release(page);
796 written = PTR_ERR(bh);
800 const struct address_space_operations affs_aops_ofs = {
801 .readpage = affs_readpage_ofs,
802 //.writepage = affs_writepage_ofs,
803 .write_begin = affs_write_begin_ofs,
804 .write_end = affs_write_end_ofs
807 /* Free any preallocated blocks. */
810 affs_free_prealloc(struct inode *inode)
812 struct super_block *sb = inode->i_sb;
814 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
816 while (AFFS_I(inode)->i_pa_cnt) {
817 AFFS_I(inode)->i_pa_cnt--;
818 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
822 /* Truncate (or enlarge) a file to the requested size. */
825 affs_truncate(struct inode *inode)
827 struct super_block *sb = inode->i_sb;
829 u32 last_blk, blkcnt, blk;
831 struct buffer_head *ext_bh;
834 pr_debug("truncate(inode=%d, oldsize=%u, newsize=%u)\n",
835 (u32)inode->i_ino, (u32)AFFS_I(inode)->mmu_private, (u32)inode->i_size);
840 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
841 ext = last_blk / AFFS_SB(sb)->s_hashsize;
844 if (inode->i_size > AFFS_I(inode)->mmu_private) {
845 struct address_space *mapping = inode->i_mapping;
848 loff_t isize = inode->i_size;
851 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata);
853 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata);
855 inode->i_size = AFFS_I(inode)->mmu_private;
856 mark_inode_dirty(inode);
858 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
862 ext_bh = affs_get_extblock(inode, ext);
863 if (IS_ERR(ext_bh)) {
864 affs_warning(sb, "truncate",
865 "unexpected read error for ext block %u (%ld)",
866 (unsigned int)ext, PTR_ERR(ext_bh));
869 if (AFFS_I(inode)->i_lc) {
870 /* clear linear cache */
871 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
872 if (AFFS_I(inode)->i_lc_size > i) {
873 AFFS_I(inode)->i_lc_size = i;
874 for (; i < AFFS_LC_SIZE; i++)
875 AFFS_I(inode)->i_lc[i] = 0;
877 /* clear associative cache */
878 for (i = 0; i < AFFS_AC_SIZE; i++)
879 if (AFFS_I(inode)->i_ac[i].ext >= ext)
880 AFFS_I(inode)->i_ac[i].ext = 0;
882 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
884 blkcnt = AFFS_I(inode)->i_blkcnt;
888 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
891 AFFS_HEAD(ext_bh)->first_data = 0;
892 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
893 size = AFFS_SB(sb)->s_hashsize;
894 if (size > blkcnt - blk + i)
895 size = blkcnt - blk + i;
896 for (; i < size; i++, blk++) {
897 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
898 AFFS_BLOCK(sb, ext_bh, i) = 0;
900 AFFS_TAIL(sb, ext_bh)->extension = 0;
901 affs_fix_checksum(sb, ext_bh);
902 mark_buffer_dirty_inode(ext_bh, inode);
906 AFFS_I(inode)->i_blkcnt = last_blk + 1;
907 AFFS_I(inode)->i_extcnt = ext + 1;
908 if (AFFS_SB(sb)->s_flags & SF_OFS) {
909 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
912 affs_warning(sb, "truncate",
913 "unexpected read error for last block %u (%ld)",
914 (unsigned int)ext, PTR_ERR(bh));
917 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
918 AFFS_DATA_HEAD(bh)->next = 0;
919 affs_adjust_checksum(bh, -tmp);
923 AFFS_I(inode)->i_blkcnt = 0;
924 AFFS_I(inode)->i_extcnt = 1;
926 AFFS_I(inode)->mmu_private = inode->i_size;
930 ext_bh = affs_bread(sb, ext_key);
931 size = AFFS_SB(sb)->s_hashsize;
932 if (size > blkcnt - blk)
934 for (i = 0; i < size; i++, blk++)
935 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
936 affs_free_block(sb, ext_key);
937 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
940 affs_free_prealloc(inode);
943 int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
945 struct inode *inode = filp->f_mapping->host;
948 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
952 mutex_lock(&inode->i_mutex);
953 ret = write_inode_now(inode, 0);
954 err = sync_blockdev(inode->i_sb->s_bdev);
957 mutex_unlock(&inode->i_mutex);
960 const struct file_operations affs_file_operations = {
961 .llseek = generic_file_llseek,
962 .read = new_sync_read,
963 .read_iter = generic_file_read_iter,
964 .write = new_sync_write,
965 .write_iter = generic_file_write_iter,
966 .mmap = generic_file_mmap,
967 .open = affs_file_open,
968 .release = affs_file_release,
969 .fsync = affs_file_fsync,
970 .splice_read = generic_file_splice_read,
973 const struct inode_operations affs_file_inode_operations = {
974 .setattr = affs_notify_change,