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Merge tag 'rtc-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
[linux.git] / fs / affs / file.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT		 2/*
3 * linux/fs/affs/file.c
4 *
5 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 *
7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 *
9 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 *
11 * (C) 1991 Linus Torvalds - minix filesystem
12 *
13 * affs regular file handling primitives
14 */
15
e2e40f2c 16#include <linux/uio.h>
3f1266f1 17#include <linux/blkdev.h>
a3bf4c36 18#include <linux/mpage.h>
1da177e4
LT		 19#include "affs.h"
20
1da177e4 21static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
1da177e4
LT		 22
23static int
24affs_file_open(struct inode *inode, struct file *filp)
25{
9606d9aa 26 pr_debug("open(%lu,%d)\n",
dca3c336
RZ		 27 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
28 atomic_inc(&AFFS_I(inode)->i_opencnt);
1da177e4
LT		 29 return 0;
30}
31
32static int
33affs_file_release(struct inode *inode, struct file *filp)
34{
9606d9aa 35 pr_debug("release(%lu, %d)\n",
dca3c336
RZ		 36 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
37
38 if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) {
5955102c 39 inode_lock(inode);
dca3c336
RZ		 40 if (inode->i_size != AFFS_I(inode)->mmu_private)
41 affs_truncate(inode);
1da177e4 42 affs_free_prealloc(inode);
5955102c 43 inode_unlock(inode);
dca3c336 44 }
1da177e4
LT		 45
46 return 0;
47}
48
49static int
50affs_grow_extcache(struct inode *inode, u32 lc_idx)
51{
52 struct super_block *sb = inode->i_sb;
53 struct buffer_head *bh;
54 u32 lc_max;
55 int i, j, key;
56
57 if (!AFFS_I(inode)->i_lc) {
58 char *ptr = (char *)get_zeroed_page(GFP_NOFS);
59 if (!ptr)
60 return -ENOMEM;
61 AFFS_I(inode)->i_lc = (u32 *)ptr;
62 AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2);
63 }
64
65 lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift;
66
67 if (AFFS_I(inode)->i_extcnt > lc_max) {
68 u32 lc_shift, lc_mask, tmp, off;
69
70 /* need to recalculate linear cache, start from old size */
71 lc_shift = AFFS_I(inode)->i_lc_shift;
72 tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift;
73 for (; tmp; tmp >>= 1)
74 lc_shift++;
75 lc_mask = (1 << lc_shift) - 1;
76
77 /* fix idx and old size to new shift */
78 lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
79 AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
80
81 /* first shrink old cache to make more space */
82 off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift);
83 for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off)
84 AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j];
85
86 AFFS_I(inode)->i_lc_shift = lc_shift;
87 AFFS_I(inode)->i_lc_mask = lc_mask;
88 }
89
90 /* fill cache to the needed index */
91 i = AFFS_I(inode)->i_lc_size;
92 AFFS_I(inode)->i_lc_size = lc_idx + 1;
93 for (; i <= lc_idx; i++) {
94 if (!i) {
95 AFFS_I(inode)->i_lc[0] = inode->i_ino;
96 continue;
97 }
98 key = AFFS_I(inode)->i_lc[i - 1];
99 j = AFFS_I(inode)->i_lc_mask + 1;
100 // unlock cache
101 for (; j > 0; j--) {
102 bh = affs_bread(sb, key);
103 if (!bh)
104 goto err;
105 key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
106 affs_brelse(bh);
107 }
108 // lock cache
109 AFFS_I(inode)->i_lc[i] = key;
110 }
111
112 return 0;
113
114err:
115 // lock cache
116 return -EIO;
117}
118
119static struct buffer_head *
120affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext)
121{
122 struct super_block *sb = inode->i_sb;
123 struct buffer_head *new_bh;
124 u32 blocknr, tmp;
125
126 blocknr = affs_alloc_block(inode, bh->b_blocknr);
127 if (!blocknr)
128 return ERR_PTR(-ENOSPC);
129
130 new_bh = affs_getzeroblk(sb, blocknr);
131 if (!new_bh) {
132 affs_free_block(sb, blocknr);
133 return ERR_PTR(-EIO);
134 }
135
136 AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST);
137 AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr);
138 AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE);
139 AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino);
140 affs_fix_checksum(sb, new_bh);
141
142 mark_buffer_dirty_inode(new_bh, inode);
143
144 tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
145 if (tmp)
146 affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp);
147 AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr);
148 affs_adjust_checksum(bh, blocknr - tmp);
149 mark_buffer_dirty_inode(bh, inode);
150
151 AFFS_I(inode)->i_extcnt++;
152 mark_inode_dirty(inode);
153
154 return new_bh;
155}
156
157static inline struct buffer_head *
158affs_get_extblock(struct inode *inode, u32 ext)
159{
160 /* inline the simplest case: same extended block as last time */
161 struct buffer_head *bh = AFFS_I(inode)->i_ext_bh;
162 if (ext == AFFS_I(inode)->i_ext_last)
dca3c336 163 get_bh(bh);
1da177e4
LT		 164 else
165 /* we have to do more (not inlined) */
166 bh = affs_get_extblock_slow(inode, ext);
167
168 return bh;
169}
170
171static struct buffer_head *
172affs_get_extblock_slow(struct inode *inode, u32 ext)
173{
174 struct super_block *sb = inode->i_sb;
175 struct buffer_head *bh;
176 u32 ext_key;
177 u32 lc_idx, lc_off, ac_idx;
178 u32 tmp, idx;
179
180 if (ext == AFFS_I(inode)->i_ext_last + 1) {
181 /* read the next extended block from the current one */
182 bh = AFFS_I(inode)->i_ext_bh;
183 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
184 if (ext < AFFS_I(inode)->i_extcnt)
185 goto read_ext;
afe305dc 186 BUG_ON(ext > AFFS_I(inode)->i_extcnt);
1da177e4
LT		 187 bh = affs_alloc_extblock(inode, bh, ext);
188 if (IS_ERR(bh))
189 return bh;
190 goto store_ext;
191 }
192
193 if (ext == 0) {
194 /* we seek back to the file header block */
195 ext_key = inode->i_ino;
196 goto read_ext;
197 }
198
199 if (ext >= AFFS_I(inode)->i_extcnt) {
200 struct buffer_head *prev_bh;
201
202 /* allocate a new extended block */
afe305dc 203 BUG_ON(ext > AFFS_I(inode)->i_extcnt);
1da177e4
LT		 204
205 /* get previous extended block */
206 prev_bh = affs_get_extblock(inode, ext - 1);
207 if (IS_ERR(prev_bh))
208 return prev_bh;
209 bh = affs_alloc_extblock(inode, prev_bh, ext);
210 affs_brelse(prev_bh);
211 if (IS_ERR(bh))
212 return bh;
213 goto store_ext;
214 }
215
216again:
217 /* check if there is an extended cache and whether it's large enough */
218 lc_idx = ext >> AFFS_I(inode)->i_lc_shift;
219 lc_off = ext & AFFS_I(inode)->i_lc_mask;
220
221 if (lc_idx >= AFFS_I(inode)->i_lc_size) {
222 int err;
223
224 err = affs_grow_extcache(inode, lc_idx);
225 if (err)
226 return ERR_PTR(err);
227 goto again;
228 }
229
230 /* every n'th key we find in the linear cache */
231 if (!lc_off) {
232 ext_key = AFFS_I(inode)->i_lc[lc_idx];
233 goto read_ext;
234 }
235
236 /* maybe it's still in the associative cache */
237 ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK;
238 if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) {
239 ext_key = AFFS_I(inode)->i_ac[ac_idx].key;
240 goto read_ext;
241 }
242
243 /* try to find one of the previous extended blocks */
244 tmp = ext;
245 idx = ac_idx;
246 while (--tmp, --lc_off > 0) {
247 idx = (idx - 1) & AFFS_AC_MASK;
248 if (AFFS_I(inode)->i_ac[idx].ext == tmp) {
249 ext_key = AFFS_I(inode)->i_ac[idx].key;
250 goto find_ext;
251 }
252 }
253
254 /* fall back to the linear cache */
255 ext_key = AFFS_I(inode)->i_lc[lc_idx];
256find_ext:
257 /* read all extended blocks until we find the one we need */
258 //unlock cache
259 do {
260 bh = affs_bread(sb, ext_key);
261 if (!bh)
262 goto err_bread;
263 ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
264 affs_brelse(bh);
265 tmp++;
266 } while (tmp < ext);
267 //lock cache
268
269 /* store it in the associative cache */
270 // recalculate ac_idx?
271 AFFS_I(inode)->i_ac[ac_idx].ext = ext;
272 AFFS_I(inode)->i_ac[ac_idx].key = ext_key;
273
274read_ext:
275 /* finally read the right extended block */
276 //unlock cache
277 bh = affs_bread(sb, ext_key);
278 if (!bh)
279 goto err_bread;
280 //lock cache
281
282store_ext:
283 /* release old cached extended block and store the new one */
284 affs_brelse(AFFS_I(inode)->i_ext_bh);
285 AFFS_I(inode)->i_ext_last = ext;
286 AFFS_I(inode)->i_ext_bh = bh;
dca3c336 287 get_bh(bh);
1da177e4
LT		 288
289 return bh;
290
291err_bread:
292 affs_brelse(bh);
293 return ERR_PTR(-EIO);
294}
295
296static int
297affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
298{
299 struct super_block *sb = inode->i_sb;
300 struct buffer_head *ext_bh;
301 u32 ext;
302
08fe100d
GU		 303 pr_debug("%s(%lu, %llu)\n", __func__, inode->i_ino,
304 (unsigned long long)block);
1da177e4 305
8d4b6900 306 BUG_ON(block > (sector_t)0x7fffffffUL);
1da177e4
LT		 307
308 if (block >= AFFS_I(inode)->i_blkcnt) {
309 if (block > AFFS_I(inode)->i_blkcnt || !create)
310 goto err_big;
311 } else
312 create = 0;
313
314 //lock cache
315 affs_lock_ext(inode);
316
317 ext = (u32)block / AFFS_SB(sb)->s_hashsize;
318 block -= ext * AFFS_SB(sb)->s_hashsize;
319 ext_bh = affs_get_extblock(inode, ext);
320 if (IS_ERR(ext_bh))
321 goto err_ext;
322 map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block)));
323
324 if (create) {
325 u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
326 if (!blocknr)
327 goto err_alloc;
328 set_buffer_new(bh_result);
329 AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize;
330 AFFS_I(inode)->i_blkcnt++;
331
332 /* store new block */
333 if (bh_result->b_blocknr)
08fe100d
GU		 334 affs_warning(sb, "get_block",
335 "block already set (%llx)",
336 (unsigned long long)bh_result->b_blocknr);
1da177e4
LT		 337 AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr);
338 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1);
339 affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1);
340 bh_result->b_blocknr = blocknr;
341
342 if (!block) {
343 /* insert first block into header block */
344 u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data);
345 if (tmp)
346 affs_warning(sb, "get_block", "first block already set (%d)", tmp);
347 AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr);
348 affs_adjust_checksum(ext_bh, blocknr - tmp);
349 }
350 }
351
352 affs_brelse(ext_bh);
353 //unlock cache
354 affs_unlock_ext(inode);
355 return 0;
356
357err_big:
08fe100d
GU		 358 affs_error(inode->i_sb, "get_block", "strange block request %llu",
359 (unsigned long long)block);
1da177e4
LT		 360 return -EIO;
361err_ext:
362 // unlock cache
363 affs_unlock_ext(inode);
364 return PTR_ERR(ext_bh);
365err_alloc:
366 brelse(ext_bh);
367 clear_buffer_mapped(bh_result);
368 bh_result->b_bdev = NULL;
369 // unlock cache
370 affs_unlock_ext(inode);
371 return -ENOSPC;
372}
373
a3bf4c36
MWO		 374static int affs_writepages(struct address_space *mapping,
375 struct writeback_control *wbc)
1da177e4 376{
a3bf4c36 377 return mpage_writepages(mapping, wbc, affs_get_block);
1da177e4 378}
f2b6a16e 379
2c69e205 380static int affs_read_folio(struct file *file, struct folio *folio)
1da177e4 381{
2c69e205 382 return block_read_full_folio(folio, affs_get_block);
1da177e4 383}
f2b6a16e 384
1dc1834f
MS		 385static void affs_write_failed(struct address_space *mapping, loff_t to)
386{
387 struct inode *inode = mapping->host;
388
389 if (to > inode->i_size) {
7caef267 390 truncate_pagecache(inode, inode->i_size);
1dc1834f
MS		 391 affs_truncate(inode);
392 }
393}
394
9abb4083 395static ssize_t
c8b8e32d 396affs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
9abb4083
FF		 397{
398 struct file *file = iocb->ki_filp;
399 struct address_space *mapping = file->f_mapping;
400 struct inode *inode = mapping->host;
401 size_t count = iov_iter_count(iter);
c8b8e32d 402 loff_t offset = iocb->ki_pos;
9abb4083
FF		 403 ssize_t ret;
404
6f673763 405 if (iov_iter_rw(iter) == WRITE) {
92b20708
FF		 406 loff_t size = offset + count;
407
408 if (AFFS_I(inode)->mmu_private < size)
409 return 0;
410 }
411
c8b8e32d 412 ret = blockdev_direct_IO(iocb, inode, iter, affs_get_block);
6f673763 413 if (ret < 0 && iov_iter_rw(iter) == WRITE)
9abb4083
FF		 414 affs_write_failed(mapping, offset + count);
415 return ret;
416}
417
f2b6a16e 418static int affs_write_begin(struct file *file, struct address_space *mapping,
9d6b0cd7 419 loff_t pos, unsigned len,
f2b6a16e 420 struct page **pagep, void **fsdata)
1da177e4 421{
282dc178
CH		 422 int ret;
423
f2b6a16e 424 *pagep = NULL;
be3bbbc5 425 ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
f2b6a16e
NP		 426 affs_get_block,
427 &AFFS_I(mapping->host)->mmu_private);
1dc1834f
MS		 428 if (unlikely(ret))
429 affs_write_failed(mapping, pos + len);
282dc178
CH		 430
431 return ret;
1da177e4 432}
f2b6a16e 433
d3a84a8d
MS		 434static int affs_write_end(struct file *file, struct address_space *mapping,
435 loff_t pos, unsigned int len, unsigned int copied,
436 struct page *page, void *fsdata)
437{
438 struct inode *inode = mapping->host;
439 int ret;
440
441 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
442
443 /* Clear Archived bit on file writes, as AmigaOS would do */
444 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
445 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
446 mark_inode_dirty(inode);
447 }
448
449 return ret;
450}
451
1da177e4
LT		 452static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
453{
454 return generic_block_bmap(mapping,block,affs_get_block);
455}
f2b6a16e 456
f5e54d6e 457const struct address_space_operations affs_aops = {
e621900a 458 .dirty_folio = block_dirty_folio,
7ba13abb 459 .invalidate_folio = block_invalidate_folio,
2c69e205 460 .read_folio = affs_read_folio,
a3bf4c36 461 .writepages = affs_writepages,
f2b6a16e 462 .write_begin = affs_write_begin,
d3a84a8d 463 .write_end = affs_write_end,
9abb4083 464 .direct_IO = affs_direct_IO,
a3bf4c36 465 .migrate_folio = buffer_migrate_folio,
1da177e4
LT		 466 .bmap = _affs_bmap
467};
468
469static inline struct buffer_head *
470affs_bread_ino(struct inode *inode, int block, int create)
471{
472 struct buffer_head *bh, tmp_bh;
473 int err;
474
475 tmp_bh.b_state = 0;
476 err = affs_get_block(inode, block, &tmp_bh, create);
477 if (!err) {
478 bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
479 if (bh) {
480 bh->b_state |= tmp_bh.b_state;
481 return bh;
482 }
483 err = -EIO;
484 }
485 return ERR_PTR(err);
486}
487
488static inline struct buffer_head *
489affs_getzeroblk_ino(struct inode *inode, int block)
490{
491 struct buffer_head *bh, tmp_bh;
492 int err;
493
494 tmp_bh.b_state = 0;
495 err = affs_get_block(inode, block, &tmp_bh, 1);
496 if (!err) {
497 bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
498 if (bh) {
499 bh->b_state |= tmp_bh.b_state;
500 return bh;
501 }
502 err = -EIO;
503 }
504 return ERR_PTR(err);
505}
506
507static inline struct buffer_head *
508affs_getemptyblk_ino(struct inode *inode, int block)
509{
510 struct buffer_head *bh, tmp_bh;
511 int err;
512
513 tmp_bh.b_state = 0;
514 err = affs_get_block(inode, block, &tmp_bh, 1);
515 if (!err) {
516 bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
517 if (bh) {
518 bh->b_state |= tmp_bh.b_state;
519 return bh;
520 }
521 err = -EIO;
522 }
523 return ERR_PTR(err);
524}
525
34113026 526static int affs_do_read_folio_ofs(struct folio *folio, size_t to, int create)
1da177e4 527{
34113026 528 struct inode *inode = folio->mapping->host;
1da177e4
LT		 529 struct super_block *sb = inode->i_sb;
530 struct buffer_head *bh;
34113026
MWO		 531 size_t pos = 0;
532 size_t bidx, boff, bsize;
1da177e4
LT		 533 u32 tmp;
534
34113026
MWO		 535 pr_debug("%s(%lu, %ld, 0, %zu)\n", __func__, inode->i_ino,
536 folio->index, to);
537 BUG_ON(to > folio_size(folio));
1da177e4 538 bsize = AFFS_SB(sb)->s_data_blksize;
34113026 539 tmp = folio_pos(folio);
1da177e4
LT		 540 bidx = tmp / bsize;
541 boff = tmp % bsize;
542
0c89d670 543 while (pos < to) {
077e073e 544 bh = affs_bread_ino(inode, bidx, create);
1da177e4
LT		 545 if (IS_ERR(bh))
546 return PTR_ERR(bh);
0c89d670
FF		 547 tmp = min(bsize - boff, to - pos);
548 BUG_ON(pos + tmp > to || tmp > bsize);
34113026 549 memcpy_to_folio(folio, pos, AFFS_DATA(bh) + boff, tmp);
1da177e4
LT		 550 affs_brelse(bh);
551 bidx++;
0c89d670 552 pos += tmp;
1da177e4
LT		 553 boff = 0;
554 }
1da177e4
LT		 555 return 0;
556}
557
558static int
559affs_extent_file_ofs(struct inode *inode, u32 newsize)
560{
561 struct super_block *sb = inode->i_sb;
562 struct buffer_head *bh, *prev_bh;
563 u32 bidx, boff;
564 u32 size, bsize;
565 u32 tmp;
566
08fe100d 567 pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize);
1da177e4
LT		 568 bsize = AFFS_SB(sb)->s_data_blksize;
569 bh = NULL;
570 size = AFFS_I(inode)->mmu_private;
571 bidx = size / bsize;
572 boff = size % bsize;
573 if (boff) {
574 bh = affs_bread_ino(inode, bidx, 0);
575 if (IS_ERR(bh))
576 return PTR_ERR(bh);
577 tmp = min(bsize - boff, newsize - size);
8d4b6900 578 BUG_ON(boff + tmp > bsize || tmp > bsize);
1da177e4 579 memset(AFFS_DATA(bh) + boff, 0, tmp);
6369a4ab 580 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
1da177e4
LT		 581 affs_fix_checksum(sb, bh);
582 mark_buffer_dirty_inode(bh, inode);
583 size += tmp;
584 bidx++;
585 } else if (bidx) {
586 bh = affs_bread_ino(inode, bidx - 1, 0);
587 if (IS_ERR(bh))
588 return PTR_ERR(bh);
589 }
590
591 while (size < newsize) {
592 prev_bh = bh;
593 bh = affs_getzeroblk_ino(inode, bidx);
594 if (IS_ERR(bh))
595 goto out;
596 tmp = min(bsize, newsize - size);
8d4b6900 597 BUG_ON(tmp > bsize);
1da177e4
LT		 598 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
599 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
600 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
601 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
602 affs_fix_checksum(sb, bh);
603 bh->b_state &= ~(1UL << BH_New);
604 mark_buffer_dirty_inode(bh, inode);
605 if (prev_bh) {
73516ace
FF		 606 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
607
608 if (tmp_next)
609 affs_warning(sb, "extent_file_ofs",
610 "next block already set for %d (%d)",
611 bidx, tmp_next);
1da177e4 612 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
73516ace 613 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
1da177e4
LT		 614 mark_buffer_dirty_inode(prev_bh, inode);
615 affs_brelse(prev_bh);
616 }
617 size += bsize;
618 bidx++;
619 }
620 affs_brelse(bh);
621 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
622 return 0;
623
624out:
625 inode->i_size = AFFS_I(inode)->mmu_private = newsize;
626 return PTR_ERR(bh);
627}
628
34113026 629static int affs_read_folio_ofs(struct file *file, struct folio *folio)
1da177e4 630{
34113026
MWO		 631 struct inode *inode = folio->mapping->host;
632 size_t to;
1da177e4
LT		 633 int err;
634
34113026
MWO		 635 pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, folio->index);
636 to = folio_size(folio);
637 if (folio_pos(folio) + to > inode->i_size) {
638 to = inode->i_size - folio_pos(folio);
639 folio_zero_segment(folio, to, folio_size(folio));
1da177e4
LT		 640 }
641
34113026 642 err = affs_do_read_folio_ofs(folio, to, 0);
1da177e4 643 if (!err)
34113026
MWO		 644 folio_mark_uptodate(folio);
645 folio_unlock(folio);
1da177e4
LT		 646 return err;
647}
648
f2b6a16e 649static int affs_write_begin_ofs(struct file *file, struct address_space *mapping,
9d6b0cd7 650 loff_t pos, unsigned len,
f2b6a16e 651 struct page **pagep, void **fsdata)
1da177e4 652{
f2b6a16e 653 struct inode *inode = mapping->host;
34113026 654 struct folio *folio;
f2b6a16e 655 pgoff_t index;
1da177e4
LT		 656 int err = 0;
657
08fe100d
GU		 658 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
659 pos + len);
f2b6a16e
NP		 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
663 */
664 err = affs_extent_file_ofs(inode, pos);
1da177e4
LT		 665 if (err)
666 return err;
667 }
f2b6a16e 668
09cbfeaf 669 index = pos >> PAGE_SHIFT;
34113026
MWO		 670 folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
671 mapping_gfp_mask(mapping));
672 if (IS_ERR(folio))
673 return PTR_ERR(folio);
674 *pagep = &folio->page;
1da177e4 675
34113026 676 if (folio_test_uptodate(folio))
1da177e4
LT		 677 return 0;
678
f2b6a16e 679 /* XXX: inefficient but safe in the face of short writes */
34113026 680 err = affs_do_read_folio_ofs(folio, folio_size(folio), 1);
f2b6a16e 681 if (err) {
34113026
MWO		 682 folio_unlock(folio);
683 folio_put(folio);
1da177e4
LT		 684 }
685 return err;
686}
687
f2b6a16e
NP		 688static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
689 loff_t pos, unsigned len, unsigned copied,
690 struct page *page, void *fsdata)
1da177e4 691{
34113026 692 struct folio *folio = page_folio(page);
f2b6a16e 693 struct inode *inode = mapping->host;
1da177e4
LT		 694 struct super_block *sb = inode->i_sb;
695 struct buffer_head *bh, *prev_bh;
696 char *data;
697 u32 bidx, boff, bsize;
f2b6a16e 698 unsigned from, to;
1da177e4
LT		 699 u32 tmp;
700 int written;
701
09cbfeaf 702 from = pos & (PAGE_SIZE - 1);
a80f2d22 703 to = from + len;
f2b6a16e
NP		 704 /*
705 * XXX: not sure if this can handle short copies (len < copied), but
34113026 706 * we don't have to, because the folio should always be uptodate here,
f2b6a16e
NP		 707 * due to write_begin.
708 */
709
08fe100d
GU		 710 pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
711 pos + len);
1da177e4 712 bsize = AFFS_SB(sb)->s_data_blksize;
34113026 713 data = folio_address(folio);
1da177e4
LT		 714
715 bh = NULL;
716 written = 0;
34113026 717 tmp = (folio->index << PAGE_SHIFT) + from;
1da177e4
LT		 718 bidx = tmp / bsize;
719 boff = tmp % bsize;
720 if (boff) {
721 bh = affs_bread_ino(inode, bidx, 0);
3d5d472c
TK		 722 if (IS_ERR(bh)) {
723 written = PTR_ERR(bh);
724 goto err_first_bh;
725 }
1da177e4 726 tmp = min(bsize - boff, to - from);
8d4b6900 727 BUG_ON(boff + tmp > bsize || tmp > bsize);
1da177e4 728 memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
6369a4ab 729 be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp);
1da177e4
LT		 730 affs_fix_checksum(sb, bh);
731 mark_buffer_dirty_inode(bh, inode);
732 written += tmp;
733 from += tmp;
734 bidx++;
735 } else if (bidx) {
736 bh = affs_bread_ino(inode, bidx - 1, 0);
3d5d472c
TK		 737 if (IS_ERR(bh)) {
738 written = PTR_ERR(bh);
739 goto err_first_bh;
740 }
1da177e4
LT		 741 }
742 while (from + bsize <= to) {
743 prev_bh = bh;
744 bh = affs_getemptyblk_ino(inode, bidx);
745 if (IS_ERR(bh))
3d5d472c 746 goto err_bh;
1da177e4
LT		 747 memcpy(AFFS_DATA(bh), data + from, bsize);
748 if (buffer_new(bh)) {
749 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
750 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
751 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
752 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
753 AFFS_DATA_HEAD(bh)->next = 0;
754 bh->b_state &= ~(1UL << BH_New);
755 if (prev_bh) {
73516ace
FF		 756 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
757
758 if (tmp_next)
759 affs_warning(sb, "commit_write_ofs",
760 "next block already set for %d (%d)",
761 bidx, tmp_next);
1da177e4 762 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
73516ace 763 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
1da177e4
LT		 764 mark_buffer_dirty_inode(prev_bh, inode);
765 }
766 }
767 affs_brelse(prev_bh);
768 affs_fix_checksum(sb, bh);
769 mark_buffer_dirty_inode(bh, inode);
770 written += bsize;
771 from += bsize;
772 bidx++;
773 }
774 if (from < to) {
775 prev_bh = bh;
776 bh = affs_bread_ino(inode, bidx, 1);
777 if (IS_ERR(bh))
3d5d472c 778 goto err_bh;
1da177e4 779 tmp = min(bsize, to - from);
8d4b6900 780 BUG_ON(tmp > bsize);
1da177e4
LT		 781 memcpy(AFFS_DATA(bh), data + from, tmp);
782 if (buffer_new(bh)) {
783 AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
784 AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
785 AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
786 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
787 AFFS_DATA_HEAD(bh)->next = 0;
788 bh->b_state &= ~(1UL << BH_New);
789 if (prev_bh) {
73516ace
FF		 790 u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
791
792 if (tmp_next)
793 affs_warning(sb, "commit_write_ofs",
794 "next block already set for %d (%d)",
795 bidx, tmp_next);
1da177e4 796 AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
73516ace 797 affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next);
1da177e4
LT		 798 mark_buffer_dirty_inode(prev_bh, inode);
799 }
800 } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
801 AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
802 affs_brelse(prev_bh);
803 affs_fix_checksum(sb, bh);
804 mark_buffer_dirty_inode(bh, inode);
805 written += tmp;
806 from += tmp;
807 bidx++;
808 }
34113026 809 folio_mark_uptodate(folio);
1da177e4
LT		 810
811done:
812 affs_brelse(bh);
34113026 813 tmp = (folio->index << PAGE_SHIFT) + from;
1da177e4
LT		 814 if (tmp > inode->i_size)
815 inode->i_size = AFFS_I(inode)->mmu_private = tmp;
816
d3a84a8d
MS		 817 /* Clear Archived bit on file writes, as AmigaOS would do */
818 if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {
819 AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;
820 mark_inode_dirty(inode);
821 }
822
3d5d472c 823err_first_bh:
34113026
MWO		 824 folio_unlock(folio);
825 folio_put(folio);
f2b6a16e 826
1da177e4
LT		 827 return written;
828
3d5d472c 829err_bh:
1da177e4
LT		 830 bh = prev_bh;
831 if (!written)
832 written = PTR_ERR(bh);
833 goto done;
834}
835
f5e54d6e 836const struct address_space_operations affs_aops_ofs = {
e621900a 837 .dirty_folio = block_dirty_folio,
7ba13abb 838 .invalidate_folio = block_invalidate_folio,
1b6f3c87 839 .read_folio = affs_read_folio_ofs,
a3bf4c36 840 //.writepages = affs_writepages_ofs,
f2b6a16e 841 .write_begin = affs_write_begin_ofs,
a3bf4c36
MWO		 842 .write_end = affs_write_end_ofs,
843 .migrate_folio = filemap_migrate_folio,
1da177e4
LT		 844};
845
846/* Free any preallocated blocks. */
847
848void
849affs_free_prealloc(struct inode *inode)
850{
851 struct super_block *sb = inode->i_sb;
852
9606d9aa 853 pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino);
1da177e4
LT		 854
855 while (AFFS_I(inode)->i_pa_cnt) {
856 AFFS_I(inode)->i_pa_cnt--;
857 affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
858 }
859}
860
861/* Truncate (or enlarge) a file to the requested size. */
862
863void
864affs_truncate(struct inode *inode)
865{
866 struct super_block *sb = inode->i_sb;
867 u32 ext, ext_key;
868 u32 last_blk, blkcnt, blk;
869 u32 size;
870 struct buffer_head *ext_bh;
871 int i;
872
08fe100d
GU		 873 pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n",
874 inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size);
1da177e4
LT		 875
876 last_blk = 0;
877 ext = 0;
878 if (inode->i_size) {
879 last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
880 ext = last_blk / AFFS_SB(sb)->s_hashsize;
881 }
882
883 if (inode->i_size > AFFS_I(inode)->mmu_private) {
884 struct address_space *mapping = inode->i_mapping;
885 struct page *page;
eef034ac 886 void *fsdata = NULL;
73516ace 887 loff_t isize = inode->i_size;
1da177e4
LT		 888 int res;
889
9d6b0cd7 890 res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, &page, &fsdata);
1da177e4 891 if (!res)
73516ace 892 res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata);
dca3c336
RZ		 893 else
894 inode->i_size = AFFS_I(inode)->mmu_private;
1da177e4
LT		 895 mark_inode_dirty(inode);
896 return;
897 } else if (inode->i_size == AFFS_I(inode)->mmu_private)
898 return;
899
900 // lock cache
901 ext_bh = affs_get_extblock(inode, ext);
902 if (IS_ERR(ext_bh)) {
1ee54b09
FF		 903 affs_warning(sb, "truncate",
904 "unexpected read error for ext block %u (%ld)",
08fe100d 905 ext, PTR_ERR(ext_bh));
1da177e4
LT		 906 return;
907 }
908 if (AFFS_I(inode)->i_lc) {
909 /* clear linear cache */
910 i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
911 if (AFFS_I(inode)->i_lc_size > i) {
912 AFFS_I(inode)->i_lc_size = i;
913 for (; i < AFFS_LC_SIZE; i++)
914 AFFS_I(inode)->i_lc[i] = 0;
915 }
916 /* clear associative cache */
917 for (i = 0; i < AFFS_AC_SIZE; i++)
918 if (AFFS_I(inode)->i_ac[i].ext >= ext)
919 AFFS_I(inode)->i_ac[i].ext = 0;
920 }
921 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
922
923 blkcnt = AFFS_I(inode)->i_blkcnt;
924 i = 0;
925 blk = last_blk;
926 if (inode->i_size) {
927 i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
928 blk++;
929 } else
930 AFFS_HEAD(ext_bh)->first_data = 0;
dca3c336 931 AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
1da177e4
LT		 932 size = AFFS_SB(sb)->s_hashsize;
933 if (size > blkcnt - blk + i)
934 size = blkcnt - blk + i;
935 for (; i < size; i++, blk++) {
936 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
937 AFFS_BLOCK(sb, ext_bh, i) = 0;
938 }
939 AFFS_TAIL(sb, ext_bh)->extension = 0;
940 affs_fix_checksum(sb, ext_bh);
941 mark_buffer_dirty_inode(ext_bh, inode);
942 affs_brelse(ext_bh);
943
944 if (inode->i_size) {
945 AFFS_I(inode)->i_blkcnt = last_blk + 1;
946 AFFS_I(inode)->i_extcnt = ext + 1;
79bda4d5 947 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) {
1da177e4
LT		 948 struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
949 u32 tmp;
0e45b67d 950 if (IS_ERR(bh)) {
1ee54b09
FF		 951 affs_warning(sb, "truncate",
952 "unexpected read error for last block %u (%ld)",
08fe100d 953 ext, PTR_ERR(bh));
1da177e4
LT		 954 return;
955 }
956 tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
957 AFFS_DATA_HEAD(bh)->next = 0;
958 affs_adjust_checksum(bh, -tmp);
959 affs_brelse(bh);
960 }
961 } else {
962 AFFS_I(inode)->i_blkcnt = 0;
963 AFFS_I(inode)->i_extcnt = 1;
964 }
965 AFFS_I(inode)->mmu_private = inode->i_size;
966 // unlock cache
967
968 while (ext_key) {
969 ext_bh = affs_bread(sb, ext_key);
970 size = AFFS_SB(sb)->s_hashsize;
971 if (size > blkcnt - blk)
972 size = blkcnt - blk;
973 for (i = 0; i < size; i++, blk++)
974 affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
975 affs_free_block(sb, ext_key);
976 ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
977 affs_brelse(ext_bh);
978 }
979 affs_free_prealloc(inode);
980}
c4758795 981
02c24a82 982int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
c4758795 983{
7ea80859 984 struct inode *inode = filp->f_mapping->host;
c4758795
AV		 985 int ret, err;
986
3b49c9a1 987 err = file_write_and_wait_range(filp, start, end);
02c24a82
JB		 988 if (err)
989 return err;
990
5955102c 991 inode_lock(inode);
c4758795
AV		 992 ret = write_inode_now(inode, 0);
993 err = sync_blockdev(inode->i_sb->s_bdev);
994 if (!ret)
995 ret = err;
5955102c 996 inode_unlock(inode);
c4758795
AV		 997 return ret;
998}
7633978b
FF		 999const struct file_operations affs_file_operations = {
1000 .llseek = generic_file_llseek,
7633978b 1001 .read_iter = generic_file_read_iter,
7633978b
FF		 1002 .write_iter = generic_file_write_iter,
1003 .mmap = generic_file_mmap,
1004 .open = affs_file_open,
1005 .release = affs_file_release,
1006 .fsync = affs_file_fsync,
2cb1e089 1007 .splice_read = filemap_splice_read,
7633978b
FF		 1008};
1009
1010const struct inode_operations affs_file_inode_operations = {
1011 .setattr = affs_notify_change,
1012};
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