1 // SPDX-License-Identifier: GPL-2.0
5 * (c) 1996 Hans-Joachim Widmaier - Rewritten
7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
9 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
11 * (C) 1991 Linus Torvalds - minix filesystem
13 * affs regular file handling primitives
16 #include <linux/uio.h>
19 static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
22 affs_file_open(struct inode *inode, struct file *filp)
24 pr_debug("open(%lu,%d)\n",
25 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
26 atomic_inc(&AFFS_I(inode)->i_opencnt);
31 affs_file_release(struct inode *inode, struct file *filp)
33 pr_debug("release(%lu, %d)\n",
34 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
36 if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) {
38 if (inode->i_size != AFFS_I(inode)->mmu_private)
40 affs_free_prealloc(inode);
48 affs_grow_extcache(struct inode *inode, u32 lc_idx)
50 struct super_block *sb = inode->i_sb;
51 struct buffer_head *bh;
55 if (!AFFS_I(inode)->i_lc) {
56 char *ptr = (char *)get_zeroed_page(GFP_NOFS);
59 AFFS_I(inode)->i_lc = (u32 *)ptr;
60 AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2);
63 lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift;
65 if (AFFS_I(inode)->i_extcnt > lc_max) {
66 u32 lc_shift, lc_mask, tmp, off;
68 /* need to recalculate linear cache, start from old size */
69 lc_shift = AFFS_I(inode)->i_lc_shift;
70 tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift;
71 for (; tmp; tmp >>= 1)
73 lc_mask = (1 << lc_shift) - 1;
75 /* fix idx and old size to new shift */
76 lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
77 AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
79 /* first shrink old cache to make more space */
80 off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift);
81 for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off)
82 AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j];
84 AFFS_I(inode)->i_lc_shift = lc_shift;
85 AFFS_I(inode)->i_lc_mask = lc_mask;
88 /* fill cache to the needed index */
89 i = AFFS_I(inode)->i_lc_size;
90 AFFS_I(inode)->i_lc_size = lc_idx + 1;
91 for (; i <= lc_idx; i++) {
93 AFFS_I(inode)->i_lc[0] = inode->i_ino;
96 key = AFFS_I(inode)->i_lc[i - 1];
97 j = AFFS_I(inode)->i_lc_mask + 1;
100 bh = affs_bread(sb, key);
103 key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
107 AFFS_I(inode)->i_lc[i] = key;
117 static struct buffer_head *
118 affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext)
120 struct super_block *sb = inode->i_sb;
121 struct buffer_head *new_bh;
124 blocknr = affs_alloc_block(inode, bh->b_blocknr);
126 return ERR_PTR(-ENOSPC);
128 new_bh = affs_getzeroblk(sb, blocknr);
130 affs_free_block(sb, blocknr);
131 return ERR_PTR(-EIO);
134 AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST);
135 AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr);
136 AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE);
137 AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino);
138 affs_fix_checksum(sb, new_bh);
140 mark_buffer_dirty_inode(new_bh, inode);
142 tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
144 affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp);
145 AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr);
146 affs_adjust_checksum(bh, blocknr - tmp);
147 mark_buffer_dirty_inode(bh, inode);
149 AFFS_I(inode)->i_extcnt++;
150 mark_inode_dirty(inode);
155 static inline struct buffer_head *
156 affs_get_extblock(struct inode *inode, u32 ext)
158 /* inline the simplest case: same extended block as last time */
159 struct buffer_head *bh = AFFS_I(inode)->i_ext_bh;
160 if (ext == AFFS_I(inode)->i_ext_last)
163 /* we have to do more (not inlined) */
164 bh = affs_get_extblock_slow(inode, ext);
169 static struct buffer_head *
170 affs_get_extblock_slow(struct inode *inode, u32 ext)
172 struct super_block *sb = inode->i_sb;
173 struct buffer_head *bh;
175 u32 lc_idx, lc_off, ac_idx;
178 if (ext == AFFS_I(inode)->i_ext_last + 1) {
179 /* read the next extended block from the current one */
180 bh = AFFS_I(inode)->i_ext_bh;
181 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
182 if (ext < AFFS_I(inode)->i_extcnt)
184 BUG_ON(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 BUG_ON(ext > AFFS_I(inode)->i_extcnt);
203 /* get previous extended block */
204 prev_bh = affs_get_extblock(inode, ext - 1);
207 bh = affs_alloc_extblock(inode, prev_bh, ext);
208 affs_brelse(prev_bh);
215 /* check if there is an extended cache and whether it's large enough */
216 lc_idx = ext >> AFFS_I(inode)->i_lc_shift;
217 lc_off = ext & AFFS_I(inode)->i_lc_mask;
219 if (lc_idx >= AFFS_I(inode)->i_lc_size) {
222 err = affs_grow_extcache(inode, lc_idx);
228 /* every n'th key we find in the linear cache */
230 ext_key = AFFS_I(inode)->i_lc[lc_idx];
234 /* maybe it's still in the associative cache */
235 ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK;
236 if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) {
237 ext_key = AFFS_I(inode)->i_ac[ac_idx].key;
241 /* try to find one of the previous extended blocks */
244 while (--tmp, --lc_off > 0) {
245 idx = (idx - 1) & AFFS_AC_MASK;
246 if (AFFS_I(inode)->i_ac[idx].ext == tmp) {
247 ext_key = AFFS_I(inode)->i_ac[idx].key;
252 /* fall back to the linear cache */
253 ext_key = AFFS_I(inode)->i_lc[lc_idx];
255 /* read all extended blocks until we find the one we need */
258 bh = affs_bread(sb, ext_key);
261 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
267 /* store it in the associative cache */
268 // recalculate ac_idx?
269 AFFS_I(inode)->i_ac[ac_idx].ext = ext;
270 AFFS_I(inode)->i_ac[ac_idx].key = ext_key;
273 /* finally read the right extended block */
275 bh = affs_bread(sb, ext_key);
281 /* release old cached extended block and store the new one */
282 affs_brelse(AFFS_I(inode)->i_ext_bh);
283 AFFS_I(inode)->i_ext_last = ext;
284 AFFS_I(inode)->i_ext_bh = bh;
291 return ERR_PTR(-EIO);
295 affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
297 struct super_block *sb = inode->i_sb;
298 struct buffer_head *ext_bh;
301 pr_debug("%s(%lu, %llu)\n", __func__, inode->i_ino,
302 (unsigned long long)block);
304 BUG_ON(block > (sector_t)0x7fffffffUL);
306 if (block >= AFFS_I(inode)->i_blkcnt) {
307 if (block > AFFS_I(inode)->i_blkcnt || !create)
313 affs_lock_ext(inode);
315 ext = (u32)block / AFFS_SB(sb)->s_hashsize;
316 block -= ext * AFFS_SB(sb)->s_hashsize;
317 ext_bh = affs_get_extblock(inode, ext);
320 map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block)));
323 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
326 set_buffer_new(bh_result);
327 AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize;
328 AFFS_I(inode)->i_blkcnt++;
330 /* store new block */
331 if (bh_result->b_blocknr)
332 affs_warning(sb, "get_block",
333 "block already set (%llx)",
334 (unsigned long 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 %llu",
357 (unsigned long long)block);
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(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);
399 loff_t offset = iocb->ki_pos;
402 if (iov_iter_rw(iter) == WRITE) {
403 loff_t size = offset + count;
405 if (AFFS_I(inode)->mmu_private < size)
409 ret = blockdev_direct_IO(iocb, inode, iter, affs_get_block);
410 if (ret < 0 && iov_iter_rw(iter) == WRITE)
411 affs_write_failed(mapping, offset + count);
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 int affs_write_end(struct file *file, struct address_space *mapping,
432 loff_t pos, unsigned int len, unsigned int copied,
433 struct page *page, void *fsdata)
435 struct inode *inode = mapping->host;
438 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
440 /* Clear Archived bit on file writes, as AmigaOS would do */
441 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
442 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
443 mark_inode_dirty(inode);
449 static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
451 return generic_block_bmap(mapping,block,affs_get_block);
454 const struct address_space_operations affs_aops = {
455 .readpage = affs_readpage,
456 .writepage = affs_writepage,
457 .write_begin = affs_write_begin,
458 .write_end = affs_write_end,
459 .direct_IO = affs_direct_IO,
463 static inline struct buffer_head *
464 affs_bread_ino(struct inode *inode, int block, int create)
466 struct buffer_head *bh, tmp_bh;
470 err = affs_get_block(inode, block, &tmp_bh, create);
472 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
474 bh->b_state |= tmp_bh.b_state;
482 static inline struct buffer_head *
483 affs_getzeroblk_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_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
493 bh->b_state |= tmp_bh.b_state;
501 static inline struct buffer_head *
502 affs_getemptyblk_ino(struct inode *inode, int block)
504 struct buffer_head *bh, tmp_bh;
508 err = affs_get_block(inode, block, &tmp_bh, 1);
510 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
512 bh->b_state |= tmp_bh.b_state;
521 affs_do_readpage_ofs(struct page *page, unsigned to, int create)
523 struct inode *inode = page->mapping->host;
524 struct super_block *sb = inode->i_sb;
525 struct buffer_head *bh;
528 u32 bidx, boff, bsize;
531 pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino,
533 BUG_ON(to > PAGE_SIZE);
534 bsize = AFFS_SB(sb)->s_data_blksize;
535 tmp = page->index << PAGE_SHIFT;
540 bh = affs_bread_ino(inode, bidx, create);
543 tmp = min(bsize - boff, to - pos);
544 BUG_ON(pos + tmp > to || tmp > bsize);
545 data = kmap_atomic(page);
546 memcpy(data + pos, AFFS_DATA(bh) + boff, tmp);
553 flush_dcache_page(page);
558 affs_extent_file_ofs(struct inode *inode, u32 newsize)
560 struct super_block *sb = inode->i_sb;
561 struct buffer_head *bh, *prev_bh;
566 pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize);
567 bsize = AFFS_SB(sb)->s_data_blksize;
569 size = AFFS_I(inode)->mmu_private;
573 bh = affs_bread_ino(inode, bidx, 0);
576 tmp = min(bsize - boff, newsize - size);
577 BUG_ON(boff + tmp > bsize || tmp > bsize);
578 memset(AFFS_DATA(bh) + boff, 0, tmp);
579 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
580 affs_fix_checksum(sb, bh);
581 mark_buffer_dirty_inode(bh, inode);
585 bh = affs_bread_ino(inode, bidx - 1, 0);
590 while (size < newsize) {
592 bh = affs_getzeroblk_ino(inode, bidx);
595 tmp = min(bsize, newsize - size);
597 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
598 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
599 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
600 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
601 affs_fix_checksum(sb, bh);
602 bh->b_state &= ~(1UL << BH_New);
603 mark_buffer_dirty_inode(bh, inode);
605 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
608 affs_warning(sb, "extent_file_ofs",
609 "next block already set for %d (%d)",
611 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
612 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
613 mark_buffer_dirty_inode(prev_bh, inode);
614 affs_brelse(prev_bh);
620 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
624 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
629 affs_readpage_ofs(struct file *file, struct page *page)
631 struct inode *inode = page->mapping->host;
635 pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index);
637 if (((page->index + 1) << PAGE_SHIFT) > inode->i_size) {
638 to = inode->i_size & ~PAGE_MASK;
639 memset(page_address(page) + to, 0, PAGE_SIZE - to);
642 err = affs_do_readpage_ofs(page, to, 0);
644 SetPageUptodate(page);
649 static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
650 loff_t pos, unsigned len, unsigned flags,
651 struct page **pagep, void **fsdata)
653 struct inode *inode = mapping->host;
658 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
660 if (pos > AFFS_I(inode)->mmu_private) {
661 /* XXX: this probably leaves a too-big i_size in case of
662 * failure. Should really be updating i_size at write_end time
664 err = affs_extent_file_ofs(inode, pos);
669 index = pos >> PAGE_SHIFT;
670 page = grab_cache_page_write_begin(mapping, index, flags);
675 if (PageUptodate(page))
678 /* XXX: inefficient but safe in the face of short writes */
679 err = affs_do_readpage_ofs(page, PAGE_SIZE, 1);
687 static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
688 loff_t pos, unsigned len, unsigned copied,
689 struct page *page, void *fsdata)
691 struct inode *inode = mapping->host;
692 struct super_block *sb = inode->i_sb;
693 struct buffer_head *bh, *prev_bh;
695 u32 bidx, boff, bsize;
700 from = pos & (PAGE_SIZE - 1);
703 * XXX: not sure if this can handle short copies (len < copied), but
704 * we don't have to, because the page should always be uptodate here,
705 * due to write_begin.
708 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
710 bsize = AFFS_SB(sb)->s_data_blksize;
711 data = page_address(page);
715 tmp = (page->index << PAGE_SHIFT) + from;
719 bh = affs_bread_ino(inode, bidx, 0);
721 written = PTR_ERR(bh);
724 tmp = min(bsize - boff, to - from);
725 BUG_ON(boff + tmp > bsize || tmp > bsize);
726 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
727 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
728 affs_fix_checksum(sb, bh);
729 mark_buffer_dirty_inode(bh, inode);
734 bh = affs_bread_ino(inode, bidx - 1, 0);
736 written = PTR_ERR(bh);
740 while (from + bsize <= to) {
742 bh = affs_getemptyblk_ino(inode, bidx);
745 memcpy(AFFS_DATA(bh), data + from, bsize);
746 if (buffer_new(bh)) {
747 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
748 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
749 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
750 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
751 AFFS_DATA_HEAD(bh)->next = 0;
752 bh->b_state &= ~(1UL << BH_New);
754 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
757 affs_warning(sb, "commit_write_ofs",
758 "next block already set for %d (%d)",
760 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
761 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
762 mark_buffer_dirty_inode(prev_bh, inode);
765 affs_brelse(prev_bh);
766 affs_fix_checksum(sb, bh);
767 mark_buffer_dirty_inode(bh, inode);
774 bh = affs_bread_ino(inode, bidx, 1);
777 tmp = min(bsize, to - from);
779 memcpy(AFFS_DATA(bh), data + from, tmp);
780 if (buffer_new(bh)) {
781 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
782 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
783 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
784 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
785 AFFS_DATA_HEAD(bh)->next = 0;
786 bh->b_state &= ~(1UL << BH_New);
788 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
791 affs_warning(sb, "commit_write_ofs",
792 "next block already set for %d (%d)",
794 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
795 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
796 mark_buffer_dirty_inode(prev_bh, inode);
798 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
799 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
800 affs_brelse(prev_bh);
801 affs_fix_checksum(sb, bh);
802 mark_buffer_dirty_inode(bh, inode);
807 SetPageUptodate(page);
811 tmp = (page->index << PAGE_SHIFT) + from;
812 if (tmp > inode->i_size)
813 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
815 /* Clear Archived bit on file writes, as AmigaOS would do */
816 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
817 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
818 mark_inode_dirty(inode);
830 written = PTR_ERR(bh);
834 const struct address_space_operations affs_aops_ofs = {
835 .readpage = affs_readpage_ofs,
836 //.writepage = affs_writepage_ofs,
837 .write_begin = affs_write_begin_ofs,
838 .write_end = affs_write_end_ofs
841 /* Free any preallocated blocks. */
844 affs_free_prealloc(struct inode *inode)
846 struct super_block *sb = inode->i_sb;
848 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
850 while (AFFS_I(inode)->i_pa_cnt) {
851 AFFS_I(inode)->i_pa_cnt--;
852 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
856 /* Truncate (or enlarge) a file to the requested size. */
859 affs_truncate(struct inode *inode)
861 struct super_block *sb = inode->i_sb;
863 u32 last_blk, blkcnt, blk;
865 struct buffer_head *ext_bh;
868 pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n",
869 inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size);
874 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
875 ext = last_blk / AFFS_SB(sb)->s_hashsize;
878 if (inode->i_size > AFFS_I(inode)->mmu_private) {
879 struct address_space *mapping = inode->i_mapping;
882 loff_t isize = inode->i_size;
885 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata);
887 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata);
889 inode->i_size = AFFS_I(inode)->mmu_private;
890 mark_inode_dirty(inode);
892 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
896 ext_bh = affs_get_extblock(inode, ext);
897 if (IS_ERR(ext_bh)) {
898 affs_warning(sb, "truncate",
899 "unexpected read error for ext block %u (%ld)",
900 ext, PTR_ERR(ext_bh));
903 if (AFFS_I(inode)->i_lc) {
904 /* clear linear cache */
905 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
906 if (AFFS_I(inode)->i_lc_size > i) {
907 AFFS_I(inode)->i_lc_size = i;
908 for (; i < AFFS_LC_SIZE; i++)
909 AFFS_I(inode)->i_lc[i] = 0;
911 /* clear associative cache */
912 for (i = 0; i < AFFS_AC_SIZE; i++)
913 if (AFFS_I(inode)->i_ac[i].ext >= ext)
914 AFFS_I(inode)->i_ac[i].ext = 0;
916 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
918 blkcnt = AFFS_I(inode)->i_blkcnt;
922 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
925 AFFS_HEAD(ext_bh)->first_data = 0;
926 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
927 size = AFFS_SB(sb)->s_hashsize;
928 if (size > blkcnt - blk + i)
929 size = blkcnt - blk + i;
930 for (; i < size; i++, blk++) {
931 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
932 AFFS_BLOCK(sb, ext_bh, i) = 0;
934 AFFS_TAIL(sb, ext_bh)->extension = 0;
935 affs_fix_checksum(sb, ext_bh);
936 mark_buffer_dirty_inode(ext_bh, inode);
940 AFFS_I(inode)->i_blkcnt = last_blk + 1;
941 AFFS_I(inode)->i_extcnt = ext + 1;
942 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) {
943 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
946 affs_warning(sb, "truncate",
947 "unexpected read error for last block %u (%ld)",
951 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
952 AFFS_DATA_HEAD(bh)->next = 0;
953 affs_adjust_checksum(bh, -tmp);
957 AFFS_I(inode)->i_blkcnt = 0;
958 AFFS_I(inode)->i_extcnt = 1;
960 AFFS_I(inode)->mmu_private = inode->i_size;
964 ext_bh = affs_bread(sb, ext_key);
965 size = AFFS_SB(sb)->s_hashsize;
966 if (size > blkcnt - blk)
968 for (i = 0; i < size; i++, blk++)
969 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
970 affs_free_block(sb, ext_key);
971 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
974 affs_free_prealloc(inode);
977 int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
979 struct inode *inode = filp->f_mapping->host;
982 err = file_write_and_wait_range(filp, start, end);
987 ret = write_inode_now(inode, 0);
988 err = sync_blockdev(inode->i_sb->s_bdev);
994 const struct file_operations affs_file_operations = {
995 .llseek = generic_file_llseek,
996 .read_iter = generic_file_read_iter,
997 .write_iter = generic_file_write_iter,
998 .mmap = generic_file_mmap,
999 .open = affs_file_open,
1000 .release = affs_file_release,
1001 .fsync = affs_file_fsync,
1002 .splice_read = generic_file_splice_read,
1005 const struct inode_operations affs_file_inode_operations = {
1006 .setattr = affs_notify_change,