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/uio.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)) {
37 if (inode->i_size != AFFS_I(inode)->mmu_private)
39 affs_free_prealloc(inode);
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(struct kiocb *iocb, struct iov_iter *iter)
394 struct file *file = iocb->ki_filp;
395 struct address_space *mapping = file->f_mapping;
396 struct inode *inode = mapping->host;
397 size_t count = iov_iter_count(iter);
398 loff_t offset = iocb->ki_pos;
401 if (iov_iter_rw(iter) == WRITE) {
402 loff_t size = offset + count;
404 if (AFFS_I(inode)->mmu_private < size)
408 ret = blockdev_direct_IO(iocb, inode, iter, affs_get_block);
409 if (ret < 0 && iov_iter_rw(iter) == WRITE)
410 affs_write_failed(mapping, offset + count);
414 static int affs_write_begin(struct file *file, struct address_space *mapping,
415 loff_t pos, unsigned len, unsigned flags,
416 struct page **pagep, void **fsdata)
421 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
423 &AFFS_I(mapping->host)->mmu_private);
425 affs_write_failed(mapping, pos + len);
430 static int affs_write_end(struct file *file, struct address_space *mapping,
431 loff_t pos, unsigned int len, unsigned int copied,
432 struct page *page, void *fsdata)
434 struct inode *inode = mapping->host;
437 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
439 /* Clear Archived bit on file writes, as AmigaOS would do */
440 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
441 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
442 mark_inode_dirty(inode);
448 static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
450 return generic_block_bmap(mapping,block,affs_get_block);
453 const struct address_space_operations affs_aops = {
454 .readpage = affs_readpage,
455 .writepage = affs_writepage,
456 .write_begin = affs_write_begin,
457 .write_end = affs_write_end,
458 .direct_IO = affs_direct_IO,
462 static inline struct buffer_head *
463 affs_bread_ino(struct inode *inode, int block, int create)
465 struct buffer_head *bh, tmp_bh;
469 err = affs_get_block(inode, block, &tmp_bh, create);
471 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
473 bh->b_state |= tmp_bh.b_state;
481 static inline struct buffer_head *
482 affs_getzeroblk_ino(struct inode *inode, int block)
484 struct buffer_head *bh, tmp_bh;
488 err = affs_get_block(inode, block, &tmp_bh, 1);
490 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
492 bh->b_state |= tmp_bh.b_state;
500 static inline struct buffer_head *
501 affs_getemptyblk_ino(struct inode *inode, int block)
503 struct buffer_head *bh, tmp_bh;
507 err = affs_get_block(inode, block, &tmp_bh, 1);
509 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
511 bh->b_state |= tmp_bh.b_state;
520 affs_do_readpage_ofs(struct page *page, unsigned to)
522 struct inode *inode = page->mapping->host;
523 struct super_block *sb = inode->i_sb;
524 struct buffer_head *bh;
527 u32 bidx, boff, bsize;
530 pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino,
532 BUG_ON(to > PAGE_SIZE);
533 bsize = AFFS_SB(sb)->s_data_blksize;
534 tmp = page->index << PAGE_SHIFT;
539 bh = affs_bread_ino(inode, bidx, 0);
542 tmp = min(bsize - boff, to - pos);
543 BUG_ON(pos + tmp > to || tmp > bsize);
544 data = kmap_atomic(page);
545 memcpy(data + pos, AFFS_DATA(bh) + boff, tmp);
552 flush_dcache_page(page);
557 affs_extent_file_ofs(struct inode *inode, u32 newsize)
559 struct super_block *sb = inode->i_sb;
560 struct buffer_head *bh, *prev_bh;
565 pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize);
566 bsize = AFFS_SB(sb)->s_data_blksize;
568 size = AFFS_I(inode)->mmu_private;
572 bh = affs_bread_ino(inode, bidx, 0);
575 tmp = min(bsize - boff, newsize - size);
576 BUG_ON(boff + tmp > bsize || tmp > bsize);
577 memset(AFFS_DATA(bh) + boff, 0, tmp);
578 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
579 affs_fix_checksum(sb, bh);
580 mark_buffer_dirty_inode(bh, inode);
584 bh = affs_bread_ino(inode, bidx - 1, 0);
589 while (size < newsize) {
591 bh = affs_getzeroblk_ino(inode, bidx);
594 tmp = min(bsize, newsize - size);
596 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
597 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
598 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
599 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
600 affs_fix_checksum(sb, bh);
601 bh->b_state &= ~(1UL << BH_New);
602 mark_buffer_dirty_inode(bh, inode);
604 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
607 affs_warning(sb, "extent_file_ofs",
608 "next block already set for %d (%d)",
610 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
611 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
612 mark_buffer_dirty_inode(prev_bh, inode);
613 affs_brelse(prev_bh);
619 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
623 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
628 affs_readpage_ofs(struct file *file, struct page *page)
630 struct inode *inode = page->mapping->host;
634 pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index);
636 if (((page->index + 1) << PAGE_SHIFT) > inode->i_size) {
637 to = inode->i_size & ~PAGE_MASK;
638 memset(page_address(page) + to, 0, PAGE_SIZE - to);
641 err = affs_do_readpage_ofs(page, to);
643 SetPageUptodate(page);
648 static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
649 loff_t pos, unsigned len, unsigned flags,
650 struct page **pagep, void **fsdata)
652 struct inode *inode = mapping->host;
657 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
659 if (pos > AFFS_I(inode)->mmu_private) {
660 /* XXX: this probably leaves a too-big i_size in case of
661 * failure. Should really be updating i_size at write_end time
663 err = affs_extent_file_ofs(inode, pos);
668 index = pos >> PAGE_SHIFT;
669 page = grab_cache_page_write_begin(mapping, index, flags);
674 if (PageUptodate(page))
677 /* XXX: inefficient but safe in the face of short writes */
678 err = affs_do_readpage_ofs(page, PAGE_SIZE);
686 static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
687 loff_t pos, unsigned len, unsigned copied,
688 struct page *page, void *fsdata)
690 struct inode *inode = mapping->host;
691 struct super_block *sb = inode->i_sb;
692 struct buffer_head *bh, *prev_bh;
694 u32 bidx, boff, bsize;
699 from = pos & (PAGE_SIZE - 1);
702 * XXX: not sure if this can handle short copies (len < copied), but
703 * we don't have to, because the page should always be uptodate here,
704 * due to write_begin.
707 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
709 bsize = AFFS_SB(sb)->s_data_blksize;
710 data = page_address(page);
714 tmp = (page->index << PAGE_SHIFT) + from;
718 bh = affs_bread_ino(inode, bidx, 0);
720 written = PTR_ERR(bh);
723 tmp = min(bsize - boff, to - from);
724 BUG_ON(boff + tmp > bsize || tmp > bsize);
725 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
726 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
727 affs_fix_checksum(sb, bh);
728 mark_buffer_dirty_inode(bh, inode);
733 bh = affs_bread_ino(inode, bidx - 1, 0);
735 written = PTR_ERR(bh);
739 while (from + bsize <= to) {
741 bh = affs_getemptyblk_ino(inode, bidx);
744 memcpy(AFFS_DATA(bh), data + from, bsize);
745 if (buffer_new(bh)) {
746 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
747 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
748 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
749 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
750 AFFS_DATA_HEAD(bh)->next = 0;
751 bh->b_state &= ~(1UL << BH_New);
753 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
756 affs_warning(sb, "commit_write_ofs",
757 "next block already set for %d (%d)",
759 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
760 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
761 mark_buffer_dirty_inode(prev_bh, inode);
764 affs_brelse(prev_bh);
765 affs_fix_checksum(sb, bh);
766 mark_buffer_dirty_inode(bh, inode);
773 bh = affs_bread_ino(inode, bidx, 1);
776 tmp = min(bsize, to - from);
778 memcpy(AFFS_DATA(bh), data + from, tmp);
779 if (buffer_new(bh)) {
780 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
781 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
782 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
783 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
784 AFFS_DATA_HEAD(bh)->next = 0;
785 bh->b_state &= ~(1UL << BH_New);
787 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
790 affs_warning(sb, "commit_write_ofs",
791 "next block already set for %d (%d)",
793 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
794 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
795 mark_buffer_dirty_inode(prev_bh, inode);
797 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
798 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
799 affs_brelse(prev_bh);
800 affs_fix_checksum(sb, bh);
801 mark_buffer_dirty_inode(bh, inode);
806 SetPageUptodate(page);
810 tmp = (page->index << PAGE_SHIFT) + from;
811 if (tmp > inode->i_size)
812 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
814 /* Clear Archived bit on file writes, as AmigaOS would do */
815 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
816 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
817 mark_inode_dirty(inode);
829 written = PTR_ERR(bh);
833 const struct address_space_operations affs_aops_ofs = {
834 .readpage = affs_readpage_ofs,
835 //.writepage = affs_writepage_ofs,
836 .write_begin = affs_write_begin_ofs,
837 .write_end = affs_write_end_ofs
840 /* Free any preallocated blocks. */
843 affs_free_prealloc(struct inode *inode)
845 struct super_block *sb = inode->i_sb;
847 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
849 while (AFFS_I(inode)->i_pa_cnt) {
850 AFFS_I(inode)->i_pa_cnt--;
851 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
855 /* Truncate (or enlarge) a file to the requested size. */
858 affs_truncate(struct inode *inode)
860 struct super_block *sb = inode->i_sb;
862 u32 last_blk, blkcnt, blk;
864 struct buffer_head *ext_bh;
867 pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n",
868 inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size);
873 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
874 ext = last_blk / AFFS_SB(sb)->s_hashsize;
877 if (inode->i_size > AFFS_I(inode)->mmu_private) {
878 struct address_space *mapping = inode->i_mapping;
881 loff_t isize = inode->i_size;
884 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata);
886 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata);
888 inode->i_size = AFFS_I(inode)->mmu_private;
889 mark_inode_dirty(inode);
891 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
895 ext_bh = affs_get_extblock(inode, ext);
896 if (IS_ERR(ext_bh)) {
897 affs_warning(sb, "truncate",
898 "unexpected read error for ext block %u (%ld)",
899 ext, PTR_ERR(ext_bh));
902 if (AFFS_I(inode)->i_lc) {
903 /* clear linear cache */
904 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
905 if (AFFS_I(inode)->i_lc_size > i) {
906 AFFS_I(inode)->i_lc_size = i;
907 for (; i < AFFS_LC_SIZE; i++)
908 AFFS_I(inode)->i_lc[i] = 0;
910 /* clear associative cache */
911 for (i = 0; i < AFFS_AC_SIZE; i++)
912 if (AFFS_I(inode)->i_ac[i].ext >= ext)
913 AFFS_I(inode)->i_ac[i].ext = 0;
915 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
917 blkcnt = AFFS_I(inode)->i_blkcnt;
921 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
924 AFFS_HEAD(ext_bh)->first_data = 0;
925 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
926 size = AFFS_SB(sb)->s_hashsize;
927 if (size > blkcnt - blk + i)
928 size = blkcnt - blk + i;
929 for (; i < size; i++, blk++) {
930 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
931 AFFS_BLOCK(sb, ext_bh, i) = 0;
933 AFFS_TAIL(sb, ext_bh)->extension = 0;
934 affs_fix_checksum(sb, ext_bh);
935 mark_buffer_dirty_inode(ext_bh, inode);
939 AFFS_I(inode)->i_blkcnt = last_blk + 1;
940 AFFS_I(inode)->i_extcnt = ext + 1;
941 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) {
942 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
945 affs_warning(sb, "truncate",
946 "unexpected read error for last block %u (%ld)",
950 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
951 AFFS_DATA_HEAD(bh)->next = 0;
952 affs_adjust_checksum(bh, -tmp);
956 AFFS_I(inode)->i_blkcnt = 0;
957 AFFS_I(inode)->i_extcnt = 1;
959 AFFS_I(inode)->mmu_private = inode->i_size;
963 ext_bh = affs_bread(sb, ext_key);
964 size = AFFS_SB(sb)->s_hashsize;
965 if (size > blkcnt - blk)
967 for (i = 0; i < size; i++, blk++)
968 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
969 affs_free_block(sb, ext_key);
970 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
973 affs_free_prealloc(inode);
976 int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
978 struct inode *inode = filp->f_mapping->host;
981 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
986 ret = write_inode_now(inode, 0);
987 err = sync_blockdev(inode->i_sb->s_bdev);
993 const struct file_operations affs_file_operations = {
994 .llseek = generic_file_llseek,
995 .read_iter = generic_file_read_iter,
996 .write_iter = generic_file_write_iter,
997 .mmap = generic_file_mmap,
998 .open = affs_file_open,
999 .release = affs_file_release,
1000 .fsync = affs_file_fsync,
1001 .splice_read = generic_file_splice_read,
1004 const struct inode_operations affs_file_inode_operations = {
1005 .setattr = affs_notify_change,