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Merge tag 'hwmon-for-v5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groec...
[linux.git] / fs / f2fs / compress.c
CommitLineData
4c8ff709
CY		 1// SPDX-License-Identifier: GPL-2.0
2/*
3 * f2fs compress support
4 *
5 * Copyright (c) 2019 Chao Yu <[email protected]>
6 */
7
8#include <linux/fs.h>
9#include <linux/f2fs_fs.h>
10#include <linux/writeback.h>
11#include <linux/backing-dev.h>
12#include <linux/lzo.h>
13#include <linux/lz4.h>
50cfa66f 14#include <linux/zstd.h>
4c8ff709
CY		 15
16#include "f2fs.h"
17#include "node.h"
18#include <trace/events/f2fs.h>
19
20struct f2fs_compress_ops {
21 int (*init_compress_ctx)(struct compress_ctx *cc);
22 void (*destroy_compress_ctx)(struct compress_ctx *cc);
23 int (*compress_pages)(struct compress_ctx *cc);
23b1faaa
CY		 24 int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
25 void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
4c8ff709
CY		 26 int (*decompress_pages)(struct decompress_io_ctx *dic);
27};
28
29static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
30{
31 return index & (cc->cluster_size - 1);
32}
33
34static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
35{
36 return index >> cc->log_cluster_size;
37}
38
39static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
40{
41 return cc->cluster_idx << cc->log_cluster_size;
42}
43
44bool f2fs_is_compressed_page(struct page *page)
45{
46 if (!PagePrivate(page))
47 return false;
48 if (!page_private(page))
49 return false;
50 if (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
51 return false;
29b993c7
YC		 52 /*
53 * page->private may be set with pid.
54 * pid_max is enough to check if it is traced.
55 */
56 if (IS_IO_TRACED_PAGE(page))
57 return false;
58
4c8ff709
CY		 59 f2fs_bug_on(F2FS_M_SB(page->mapping),
60 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
61 return true;
62}
63
64static void f2fs_set_compressed_page(struct page *page,
887347a0 65 struct inode *inode, pgoff_t index, void *data)
4c8ff709
CY		 66{
67 SetPagePrivate(page);
68 set_page_private(page, (unsigned long)data);
69
70 /* i_crypto_info and iv index */
71 page->index = index;
72 page->mapping = inode->i_mapping;
4c8ff709
CY		 73}
74
4c8ff709
CY		 75static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
76{
77 int i;
78
79 for (i = 0; i < len; i++) {
80 if (!cc->rpages[i])
81 continue;
82 if (unlock)
83 unlock_page(cc->rpages[i]);
84 else
85 put_page(cc->rpages[i]);
86 }
87}
88
89static void f2fs_put_rpages(struct compress_ctx *cc)
90{
91 f2fs_drop_rpages(cc, cc->cluster_size, false);
92}
93
94static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
95{
96 f2fs_drop_rpages(cc, len, true);
97}
98
bc67c5d0 99static void f2fs_put_rpages_mapping(struct address_space *mapping,
4c8ff709
CY		 100 pgoff_t start, int len)
101{
102 int i;
103
104 for (i = 0; i < len; i++) {
105 struct page *page = find_get_page(mapping, start + i);
106
107 put_page(page);
108 put_page(page);
109 }
110}
111
112static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
113 struct writeback_control *wbc, bool redirty, int unlock)
114{
115 unsigned int i;
116
117 for (i = 0; i < cc->cluster_size; i++) {
118 if (!cc->rpages[i])
119 continue;
120 if (redirty)
121 redirty_page_for_writepage(wbc, cc->rpages[i]);
122 f2fs_put_page(cc->rpages[i], unlock);
123 }
124}
125
126struct page *f2fs_compress_control_page(struct page *page)
127{
128 return ((struct compress_io_ctx *)page_private(page))->rpages[0];
129}
130
131int f2fs_init_compress_ctx(struct compress_ctx *cc)
132{
133 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
134
135 if (cc->nr_rpages)
136 return 0;
137
138 cc->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
139 cc->log_cluster_size, GFP_NOFS);
140 return cc->rpages ? 0 : -ENOMEM;
141}
142
143void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
144{
145 kfree(cc->rpages);
146 cc->rpages = NULL;
147 cc->nr_rpages = 0;
148 cc->nr_cpages = 0;
149 cc->cluster_idx = NULL_CLUSTER;
150}
151
152void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
153{
154 unsigned int cluster_ofs;
155
156 if (!f2fs_cluster_can_merge_page(cc, page->index))
157 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
158
159 cluster_ofs = offset_in_cluster(cc, page->index);
160 cc->rpages[cluster_ofs] = page;
161 cc->nr_rpages++;
162 cc->cluster_idx = cluster_idx(cc, page->index);
163}
164
165#ifdef CONFIG_F2FS_FS_LZO
166static int lzo_init_compress_ctx(struct compress_ctx *cc)
167{
168 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
169 LZO1X_MEM_COMPRESS, GFP_NOFS);
170 if (!cc->private)
171 return -ENOMEM;
172
173 cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
174 return 0;
175}
176
177static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
178{
179 kvfree(cc->private);
180 cc->private = NULL;
181}
182
183static int lzo_compress_pages(struct compress_ctx *cc)
184{
185 int ret;
186
187 ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
188 &cc->clen, cc->private);
189 if (ret != LZO_E_OK) {
190 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
191 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
192 return -EIO;
193 }
194 return 0;
195}
196
197static int lzo_decompress_pages(struct decompress_io_ctx *dic)
198{
199 int ret;
200
201 ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
202 dic->rbuf, &dic->rlen);
203 if (ret != LZO_E_OK) {
204 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
205 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
206 return -EIO;
207 }
208
209 if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
210 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
211 "expected:%lu\n", KERN_ERR,
212 F2FS_I_SB(dic->inode)->sb->s_id,
213 dic->rlen,
214 PAGE_SIZE << dic->log_cluster_size);
215 return -EIO;
216 }
217 return 0;
218}
219
220static const struct f2fs_compress_ops f2fs_lzo_ops = {
221 .init_compress_ctx = lzo_init_compress_ctx,
222 .destroy_compress_ctx = lzo_destroy_compress_ctx,
223 .compress_pages = lzo_compress_pages,
224 .decompress_pages = lzo_decompress_pages,
225};
226#endif
227
228#ifdef CONFIG_F2FS_FS_LZ4
229static int lz4_init_compress_ctx(struct compress_ctx *cc)
230{
231 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
232 LZ4_MEM_COMPRESS, GFP_NOFS);
233 if (!cc->private)
234 return -ENOMEM;
235
f6644143
CY		 236 /*
237 * we do not change cc->clen to LZ4_compressBound(inputsize) to
238 * adapt worst compress case, because lz4 compressor can handle
239 * output budget properly.
240 */
241 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
4c8ff709
CY		 242 return 0;
243}
244
245static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
246{
247 kvfree(cc->private);
248 cc->private = NULL;
249}
250
251static int lz4_compress_pages(struct compress_ctx *cc)
252{
253 int len;
254
255 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
256 cc->clen, cc->private);
f6644143
CY		 257 if (!len)
258 return -EAGAIN;
259
4c8ff709
CY		 260 cc->clen = len;
261 return 0;
262}
263
264static int lz4_decompress_pages(struct decompress_io_ctx *dic)
265{
266 int ret;
267
268 ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
269 dic->clen, dic->rlen);
270 if (ret < 0) {
271 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
272 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
273 return -EIO;
274 }
275
276 if (ret != PAGE_SIZE << dic->log_cluster_size) {
277 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
278 "expected:%lu\n", KERN_ERR,
279 F2FS_I_SB(dic->inode)->sb->s_id,
280 dic->rlen,
281 PAGE_SIZE << dic->log_cluster_size);
282 return -EIO;
283 }
284 return 0;
285}
286
287static const struct f2fs_compress_ops f2fs_lz4_ops = {
288 .init_compress_ctx = lz4_init_compress_ctx,
289 .destroy_compress_ctx = lz4_destroy_compress_ctx,
290 .compress_pages = lz4_compress_pages,
291 .decompress_pages = lz4_decompress_pages,
292};
293#endif
294
50cfa66f
CY		 295#ifdef CONFIG_F2FS_FS_ZSTD
296#define F2FS_ZSTD_DEFAULT_CLEVEL 1
297
298static int zstd_init_compress_ctx(struct compress_ctx *cc)
299{
300 ZSTD_parameters params;
301 ZSTD_CStream *stream;
302 void *workspace;
303 unsigned int workspace_size;
304
305 params = ZSTD_getParams(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen, 0);
306 workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
307
308 workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
309 workspace_size, GFP_NOFS);
310 if (!workspace)
311 return -ENOMEM;
312
313 stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
314 if (!stream) {
315 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
316 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
317 __func__);
318 kvfree(workspace);
319 return -EIO;
320 }
321
322 cc->private = workspace;
323 cc->private2 = stream;
324
325 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
326 return 0;
327}
328
329static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
330{
331 kvfree(cc->private);
332 cc->private = NULL;
333 cc->private2 = NULL;
334}
335
336static int zstd_compress_pages(struct compress_ctx *cc)
337{
338 ZSTD_CStream *stream = cc->private2;
339 ZSTD_inBuffer inbuf;
340 ZSTD_outBuffer outbuf;
341 int src_size = cc->rlen;
342 int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
343 int ret;
344
345 inbuf.pos = 0;
346 inbuf.src = cc->rbuf;
347 inbuf.size = src_size;
348
349 outbuf.pos = 0;
350 outbuf.dst = cc->cbuf->cdata;
351 outbuf.size = dst_size;
352
353 ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
354 if (ZSTD_isError(ret)) {
355 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
356 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
357 __func__, ZSTD_getErrorCode(ret));
358 return -EIO;
359 }
360
361 ret = ZSTD_endStream(stream, &outbuf);
362 if (ZSTD_isError(ret)) {
363 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
364 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
365 __func__, ZSTD_getErrorCode(ret));
366 return -EIO;
367 }
368
1454c978
CY		 369 /*
370 * there is compressed data remained in intermediate buffer due to
371 * no more space in cbuf.cdata
372 */
373 if (ret)
374 return -EAGAIN;
375
50cfa66f
CY		 376 cc->clen = outbuf.pos;
377 return 0;
378}
379
380static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
381{
382 ZSTD_DStream *stream;
383 void *workspace;
384 unsigned int workspace_size;
385
386 workspace_size = ZSTD_DStreamWorkspaceBound(MAX_COMPRESS_WINDOW_SIZE);
387
388 workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
389 workspace_size, GFP_NOFS);
390 if (!workspace)
391 return -ENOMEM;
392
393 stream = ZSTD_initDStream(MAX_COMPRESS_WINDOW_SIZE,
394 workspace, workspace_size);
395 if (!stream) {
396 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
397 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
398 __func__);
399 kvfree(workspace);
400 return -EIO;
401 }
402
403 dic->private = workspace;
404 dic->private2 = stream;
405
406 return 0;
407}
408
409static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
410{
411 kvfree(dic->private);
412 dic->private = NULL;
413 dic->private2 = NULL;
414}
415
416static int zstd_decompress_pages(struct decompress_io_ctx *dic)
417{
418 ZSTD_DStream *stream = dic->private2;
419 ZSTD_inBuffer inbuf;
420 ZSTD_outBuffer outbuf;
421 int ret;
422
423 inbuf.pos = 0;
424 inbuf.src = dic->cbuf->cdata;
425 inbuf.size = dic->clen;
426
427 outbuf.pos = 0;
428 outbuf.dst = dic->rbuf;
429 outbuf.size = dic->rlen;
430
431 ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
432 if (ZSTD_isError(ret)) {
433 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
434 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
435 __func__, ZSTD_getErrorCode(ret));
436 return -EIO;
437 }
438
439 if (dic->rlen != outbuf.pos) {
440 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
441 "expected:%lu\n", KERN_ERR,
442 F2FS_I_SB(dic->inode)->sb->s_id,
443 __func__, dic->rlen,
444 PAGE_SIZE << dic->log_cluster_size);
445 return -EIO;
446 }
447
448 return 0;
449}
450
451static const struct f2fs_compress_ops f2fs_zstd_ops = {
452 .init_compress_ctx = zstd_init_compress_ctx,
453 .destroy_compress_ctx = zstd_destroy_compress_ctx,
454 .compress_pages = zstd_compress_pages,
455 .init_decompress_ctx = zstd_init_decompress_ctx,
456 .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
457 .decompress_pages = zstd_decompress_pages,
458};
459#endif
460
6d92b201
CY		 461#ifdef CONFIG_F2FS_FS_LZO
462#ifdef CONFIG_F2FS_FS_LZORLE
463static int lzorle_compress_pages(struct compress_ctx *cc)
464{
465 int ret;
466
467 ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
468 &cc->clen, cc->private);
469 if (ret != LZO_E_OK) {
470 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
471 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
472 return -EIO;
473 }
474 return 0;
475}
476
477static const struct f2fs_compress_ops f2fs_lzorle_ops = {
478 .init_compress_ctx = lzo_init_compress_ctx,
479 .destroy_compress_ctx = lzo_destroy_compress_ctx,
480 .compress_pages = lzorle_compress_pages,
481 .decompress_pages = lzo_decompress_pages,
482};
483#endif
484#endif
485
4c8ff709
CY		 486static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
487#ifdef CONFIG_F2FS_FS_LZO
488 &f2fs_lzo_ops,
489#else
490 NULL,
491#endif
492#ifdef CONFIG_F2FS_FS_LZ4
493 &f2fs_lz4_ops,
494#else
495 NULL,
496#endif
50cfa66f
CY		 497#ifdef CONFIG_F2FS_FS_ZSTD
498 &f2fs_zstd_ops,
499#else
500 NULL,
501#endif
6d92b201
CY		 502#if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
503 &f2fs_lzorle_ops,
504#else
505 NULL,
506#endif
4c8ff709
CY		 507};
508
509bool f2fs_is_compress_backend_ready(struct inode *inode)
510{
511 if (!f2fs_compressed_file(inode))
512 return true;
513 return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
514}
515
99bbe307 516static mempool_t *compress_page_pool;
5e6bbde9
CY		 517static int num_compress_pages = 512;
518module_param(num_compress_pages, uint, 0444);
519MODULE_PARM_DESC(num_compress_pages,
520 "Number of intermediate compress pages to preallocate");
521
522int f2fs_init_compress_mempool(void)
523{
524 compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
525 if (!compress_page_pool)
526 return -ENOMEM;
527
528 return 0;
529}
530
531void f2fs_destroy_compress_mempool(void)
532{
533 mempool_destroy(compress_page_pool);
534}
535
536static struct page *f2fs_compress_alloc_page(void)
4c8ff709
CY		 537{
538 struct page *page;
539
5e6bbde9 540 page = mempool_alloc(compress_page_pool, GFP_NOFS);
4c8ff709 541 lock_page(page);
5e6bbde9 542
4c8ff709
CY		 543 return page;
544}
545
5e6bbde9
CY		 546static void f2fs_compress_free_page(struct page *page)
547{
548 if (!page)
549 return;
550 set_page_private(page, (unsigned long)NULL);
551 ClearPagePrivate(page);
552 page->mapping = NULL;
553 unlock_page(page);
554 mempool_free(page, compress_page_pool);
555}
556
4c8ff709
CY		 557static int f2fs_compress_pages(struct compress_ctx *cc)
558{
559 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
560 struct f2fs_inode_info *fi = F2FS_I(cc->inode);
561 const struct f2fs_compress_ops *cops =
562 f2fs_cops[fi->i_compress_algorithm];
563 unsigned int max_len, nr_cpages;
564 int i, ret;
565
566 trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
567 cc->cluster_size, fi->i_compress_algorithm);
568
23b1faaa
CY		 569 if (cops->init_compress_ctx) {
570 ret = cops->init_compress_ctx(cc);
571 if (ret)
572 goto out;
573 }
4c8ff709
CY		 574
575 max_len = COMPRESS_HEADER_SIZE + cc->clen;
576 cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
577
578 cc->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
579 cc->nr_cpages, GFP_NOFS);
580 if (!cc->cpages) {
581 ret = -ENOMEM;
582 goto destroy_compress_ctx;
583 }
584
585 for (i = 0; i < cc->nr_cpages; i++) {
5e6bbde9 586 cc->cpages[i] = f2fs_compress_alloc_page();
4c8ff709
CY		 587 if (!cc->cpages[i]) {
588 ret = -ENOMEM;
589 goto out_free_cpages;
590 }
591 }
592
593 cc->rbuf = vmap(cc->rpages, cc->cluster_size, VM_MAP, PAGE_KERNEL_RO);
594 if (!cc->rbuf) {
595 ret = -ENOMEM;
596 goto out_free_cpages;
597 }
598
599 cc->cbuf = vmap(cc->cpages, cc->nr_cpages, VM_MAP, PAGE_KERNEL);
600 if (!cc->cbuf) {
601 ret = -ENOMEM;
602 goto out_vunmap_rbuf;
603 }
604
605 ret = cops->compress_pages(cc);
606 if (ret)
607 goto out_vunmap_cbuf;
608
609 max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
610
611 if (cc->clen > max_len) {
612 ret = -EAGAIN;
613 goto out_vunmap_cbuf;
614 }
615
616 cc->cbuf->clen = cpu_to_le32(cc->clen);
4c8ff709
CY		 617
618 for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
619 cc->cbuf->reserved[i] = cpu_to_le32(0);
620
7fa6d598
EB		 621 nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
622
623 /* zero out any unused part of the last page */
624 memset(&cc->cbuf->cdata[cc->clen], 0,
625 (nr_cpages * PAGE_SIZE) - (cc->clen + COMPRESS_HEADER_SIZE));
626
4c8ff709
CY		 627 vunmap(cc->cbuf);
628 vunmap(cc->rbuf);
629
4c8ff709 630 for (i = nr_cpages; i < cc->nr_cpages; i++) {
5e6bbde9 631 f2fs_compress_free_page(cc->cpages[i]);
4c8ff709
CY		 632 cc->cpages[i] = NULL;
633 }
634
23b1faaa
CY		 635 if (cops->destroy_compress_ctx)
636 cops->destroy_compress_ctx(cc);
09ff4801 637
4c8ff709
CY		 638 cc->nr_cpages = nr_cpages;
639
640 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
641 cc->clen, ret);
642 return 0;
643
644out_vunmap_cbuf:
645 vunmap(cc->cbuf);
646out_vunmap_rbuf:
647 vunmap(cc->rbuf);
648out_free_cpages:
649 for (i = 0; i < cc->nr_cpages; i++) {
650 if (cc->cpages[i])
5e6bbde9 651 f2fs_compress_free_page(cc->cpages[i]);
4c8ff709
CY		 652 }
653 kfree(cc->cpages);
654 cc->cpages = NULL;
655destroy_compress_ctx:
23b1faaa
CY		 656 if (cops->destroy_compress_ctx)
657 cops->destroy_compress_ctx(cc);
4c8ff709
CY		 658out:
659 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
660 cc->clen, ret);
661 return ret;
662}
663
664void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
665{
666 struct decompress_io_ctx *dic =
667 (struct decompress_io_ctx *)page_private(page);
668 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
669 struct f2fs_inode_info *fi= F2FS_I(dic->inode);
670 const struct f2fs_compress_ops *cops =
671 f2fs_cops[fi->i_compress_algorithm];
672 int ret;
b2f57a8e 673 int i;
4c8ff709
CY		 674
675 dec_page_count(sbi, F2FS_RD_DATA);
676
677 if (bio->bi_status || PageError(page))
678 dic->failed = true;
679
680 if (refcount_dec_not_one(&dic->ref))
681 return;
682
683 trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
684 dic->cluster_size, fi->i_compress_algorithm);
685
686 /* submit partial compressed pages */
687 if (dic->failed) {
688 ret = -EIO;
689 goto out_free_dic;
690 }
691
b2f57a8e
CY		 692 dic->tpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
693 dic->cluster_size, GFP_NOFS);
694 if (!dic->tpages) {
695 ret = -ENOMEM;
696 goto out_free_dic;
697 }
698
699 for (i = 0; i < dic->cluster_size; i++) {
700 if (dic->rpages[i]) {
701 dic->tpages[i] = dic->rpages[i];
702 continue;
703 }
704
705 dic->tpages[i] = f2fs_compress_alloc_page();
706 if (!dic->tpages[i]) {
707 ret = -ENOMEM;
708 goto out_free_dic;
709 }
710 }
711
23b1faaa
CY		 712 if (cops->init_decompress_ctx) {
713 ret = cops->init_decompress_ctx(dic);
714 if (ret)
715 goto out_free_dic;
716 }
717
4c8ff709
CY		 718 dic->rbuf = vmap(dic->tpages, dic->cluster_size, VM_MAP, PAGE_KERNEL);
719 if (!dic->rbuf) {
720 ret = -ENOMEM;
23b1faaa 721 goto destroy_decompress_ctx;
4c8ff709
CY		 722 }
723
724 dic->cbuf = vmap(dic->cpages, dic->nr_cpages, VM_MAP, PAGE_KERNEL_RO);
725 if (!dic->cbuf) {
726 ret = -ENOMEM;
727 goto out_vunmap_rbuf;
728 }
729
730 dic->clen = le32_to_cpu(dic->cbuf->clen);
731 dic->rlen = PAGE_SIZE << dic->log_cluster_size;
732
733 if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
734 ret = -EFSCORRUPTED;
735 goto out_vunmap_cbuf;
736 }
737
738 ret = cops->decompress_pages(dic);
739
740out_vunmap_cbuf:
741 vunmap(dic->cbuf);
742out_vunmap_rbuf:
743 vunmap(dic->rbuf);
23b1faaa
CY		 744destroy_decompress_ctx:
745 if (cops->destroy_decompress_ctx)
746 cops->destroy_decompress_ctx(dic);
4c8ff709 747out_free_dic:
79bbefb1 748 if (verity)
887347a0 749 refcount_set(&dic->ref, dic->nr_cpages);
4c8ff709
CY		 750 if (!verity)
751 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
752 ret, false);
753
754 trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
755 dic->clen, ret);
756 if (!verity)
757 f2fs_free_dic(dic);
758}
759
760static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
761{
762 if (cc->cluster_idx == NULL_CLUSTER)
763 return true;
764 return cc->cluster_idx == cluster_idx(cc, index);
765}
766
767bool f2fs_cluster_is_empty(struct compress_ctx *cc)
768{
769 return cc->nr_rpages == 0;
770}
771
772static bool f2fs_cluster_is_full(struct compress_ctx *cc)
773{
774 return cc->cluster_size == cc->nr_rpages;
775}
776
777bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
778{
779 if (f2fs_cluster_is_empty(cc))
780 return true;
781 return is_page_in_cluster(cc, index);
782}
783
784static bool __cluster_may_compress(struct compress_ctx *cc)
785{
786 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
787 loff_t i_size = i_size_read(cc->inode);
788 unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
789 int i;
790
791 for (i = 0; i < cc->cluster_size; i++) {
792 struct page *page = cc->rpages[i];
793
794 f2fs_bug_on(sbi, !page);
795
796 if (unlikely(f2fs_cp_error(sbi)))
797 return false;
798 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
799 return false;
800
801 /* beyond EOF */
802 if (page->index >= nr_pages)
803 return false;
804 }
805 return true;
806}
807
1a67cbe1 808static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
4c8ff709
CY		 809{
810 struct dnode_of_data dn;
811 int ret;
812
813 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
814 ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
815 LOOKUP_NODE);
816 if (ret) {
817 if (ret == -ENOENT)
818 ret = 0;
819 goto fail;
820 }
821
822 if (dn.data_blkaddr == COMPRESS_ADDR) {
823 int i;
824
825 ret = 1;
826 for (i = 1; i < cc->cluster_size; i++) {
827 block_t blkaddr;
828
a2ced1ce 829 blkaddr = data_blkaddr(dn.inode,
4c8ff709 830 dn.node_page, dn.ofs_in_node + i);
1a67cbe1
CY		 831 if (compr) {
832 if (__is_valid_data_blkaddr(blkaddr))
833 ret++;
834 } else {
835 if (blkaddr != NULL_ADDR)
836 ret++;
837 }
4c8ff709
CY		 838 }
839 }
840fail:
841 f2fs_put_dnode(&dn);
842 return ret;
843}
844
1a67cbe1
CY		 845/* return # of compressed blocks in compressed cluster */
846static int f2fs_compressed_blocks(struct compress_ctx *cc)
847{
848 return __f2fs_cluster_blocks(cc, true);
849}
850
851/* return # of valid blocks in compressed cluster */
d078319d 852static int f2fs_cluster_blocks(struct compress_ctx *cc)
1a67cbe1
CY		 853{
854 return __f2fs_cluster_blocks(cc, false);
855}
856
4c8ff709
CY		 857int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
858{
859 struct compress_ctx cc = {
860 .inode = inode,
861 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
862 .cluster_size = F2FS_I(inode)->i_cluster_size,
863 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
864 };
865
d078319d 866 return f2fs_cluster_blocks(&cc);
4c8ff709
CY		 867}
868
869static bool cluster_may_compress(struct compress_ctx *cc)
870{
871 if (!f2fs_compressed_file(cc->inode))
872 return false;
873 if (f2fs_is_atomic_file(cc->inode))
874 return false;
875 if (f2fs_is_mmap_file(cc->inode))
876 return false;
877 if (!f2fs_cluster_is_full(cc))
878 return false;
dc35d73a
CY		 879 if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
880 return false;
4c8ff709
CY		 881 return __cluster_may_compress(cc);
882}
883
884static void set_cluster_writeback(struct compress_ctx *cc)
885{
886 int i;
887
888 for (i = 0; i < cc->cluster_size; i++) {
889 if (cc->rpages[i])
890 set_page_writeback(cc->rpages[i]);
891 }
892}
893
894static void set_cluster_dirty(struct compress_ctx *cc)
895{
896 int i;
897
898 for (i = 0; i < cc->cluster_size; i++)
899 if (cc->rpages[i])
900 set_page_dirty(cc->rpages[i]);
901}
902
903static int prepare_compress_overwrite(struct compress_ctx *cc,
904 struct page **pagep, pgoff_t index, void **fsdata)
905{
906 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
907 struct address_space *mapping = cc->inode->i_mapping;
908 struct page *page;
909 struct dnode_of_data dn;
910 sector_t last_block_in_bio;
911 unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
912 pgoff_t start_idx = start_idx_of_cluster(cc);
913 int i, ret;
914 bool prealloc;
915
916retry:
d078319d 917 ret = f2fs_cluster_blocks(cc);
4c8ff709
CY		 918 if (ret <= 0)
919 return ret;
920
921 /* compressed case */
922 prealloc = (ret < cc->cluster_size);
923
924 ret = f2fs_init_compress_ctx(cc);
925 if (ret)
926 return ret;
927
928 /* keep page reference to avoid page reclaim */
929 for (i = 0; i < cc->cluster_size; i++) {
930 page = f2fs_pagecache_get_page(mapping, start_idx + i,
931 fgp_flag, GFP_NOFS);
932 if (!page) {
933 ret = -ENOMEM;
934 goto unlock_pages;
935 }
936
937 if (PageUptodate(page))
938 unlock_page(page);
939 else
940 f2fs_compress_ctx_add_page(cc, page);
941 }
942
943 if (!f2fs_cluster_is_empty(cc)) {
944 struct bio *bio = NULL;
945
946 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
0683728a 947 &last_block_in_bio, false, true);
4c8ff709
CY		 948 f2fs_destroy_compress_ctx(cc);
949 if (ret)
950 goto release_pages;
951 if (bio)
952 f2fs_submit_bio(sbi, bio, DATA);
953
954 ret = f2fs_init_compress_ctx(cc);
955 if (ret)
956 goto release_pages;
957 }
958
959 for (i = 0; i < cc->cluster_size; i++) {
960 f2fs_bug_on(sbi, cc->rpages[i]);
961
962 page = find_lock_page(mapping, start_idx + i);
963 f2fs_bug_on(sbi, !page);
964
965 f2fs_wait_on_page_writeback(page, DATA, true, true);
966
967 f2fs_compress_ctx_add_page(cc, page);
968 f2fs_put_page(page, 0);
969
970 if (!PageUptodate(page)) {
971 f2fs_unlock_rpages(cc, i + 1);
bc67c5d0 972 f2fs_put_rpages_mapping(mapping, start_idx,
4c8ff709
CY		 973 cc->cluster_size);
974 f2fs_destroy_compress_ctx(cc);
975 goto retry;
976 }
977 }
978
979 if (prealloc) {
0ef81833 980 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
4c8ff709
CY		 981
982 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
983
984 for (i = cc->cluster_size - 1; i > 0; i--) {
985 ret = f2fs_get_block(&dn, start_idx + i);
986 if (ret) {
987 i = cc->cluster_size;
988 break;
989 }
990
991 if (dn.data_blkaddr != NEW_ADDR)
992 break;
993 }
994
0ef81833 995 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
4c8ff709
CY		 996 }
997
998 if (likely(!ret)) {
999 *fsdata = cc->rpages;
1000 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1001 return cc->cluster_size;
1002 }
1003
1004unlock_pages:
1005 f2fs_unlock_rpages(cc, i);
1006release_pages:
bc67c5d0 1007 f2fs_put_rpages_mapping(mapping, start_idx, i);
4c8ff709
CY		 1008 f2fs_destroy_compress_ctx(cc);
1009 return ret;
1010}
1011
1012int f2fs_prepare_compress_overwrite(struct inode *inode,
1013 struct page **pagep, pgoff_t index, void **fsdata)
1014{
1015 struct compress_ctx cc = {
1016 .inode = inode,
1017 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1018 .cluster_size = F2FS_I(inode)->i_cluster_size,
1019 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1020 .rpages = NULL,
1021 .nr_rpages = 0,
1022 };
1023
1024 return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1025}
1026
1027bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1028 pgoff_t index, unsigned copied)
1029
1030{
1031 struct compress_ctx cc = {
1032 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1033 .cluster_size = F2FS_I(inode)->i_cluster_size,
1034 .rpages = fsdata,
1035 };
1036 bool first_index = (index == cc.rpages[0]->index);
1037
1038 if (copied)
1039 set_cluster_dirty(&cc);
1040
1041 f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1042 f2fs_destroy_compress_ctx(&cc);
1043
1044 return first_index;
1045}
1046
3265d3db
CY		 1047int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1048{
1049 void *fsdata = NULL;
1050 struct page *pagep;
1051 int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1052 pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1053 log_cluster_size;
1054 int err;
1055
1056 err = f2fs_is_compressed_cluster(inode, start_idx);
1057 if (err < 0)
1058 return err;
1059
1060 /* truncate normal cluster */
1061 if (!err)
1062 return f2fs_do_truncate_blocks(inode, from, lock);
1063
1064 /* truncate compressed cluster */
1065 err = f2fs_prepare_compress_overwrite(inode, &pagep,
1066 start_idx, &fsdata);
1067
1068 /* should not be a normal cluster */
1069 f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1070
1071 if (err <= 0)
1072 return err;
1073
1074 if (err > 0) {
1075 struct page **rpages = fsdata;
1076 int cluster_size = F2FS_I(inode)->i_cluster_size;
1077 int i;
1078
1079 for (i = cluster_size - 1; i >= 0; i--) {
1080 loff_t start = rpages[i]->index << PAGE_SHIFT;
1081
1082 if (from <= start) {
1083 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1084 } else {
1085 zero_user_segment(rpages[i], from - start,
1086 PAGE_SIZE);
1087 break;
1088 }
1089 }
1090
1091 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1092 }
1093 return 0;
1094}
1095
4c8ff709
CY		 1096static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1097 int *submitted,
1098 struct writeback_control *wbc,
1099 enum iostat_type io_type)
1100{
1101 struct inode *inode = cc->inode;
1102 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1103 struct f2fs_inode_info *fi = F2FS_I(inode);
1104 struct f2fs_io_info fio = {
1105 .sbi = sbi,
1106 .ino = cc->inode->i_ino,
1107 .type = DATA,
1108 .op = REQ_OP_WRITE,
1109 .op_flags = wbc_to_write_flags(wbc),
1110 .old_blkaddr = NEW_ADDR,
1111 .page = NULL,
1112 .encrypted_page = NULL,
1113 .compressed_page = NULL,
1114 .submitted = false,
4c8ff709
CY		 1115 .io_type = io_type,
1116 .io_wbc = wbc,
27aacd28 1117 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
4c8ff709
CY		 1118 };
1119 struct dnode_of_data dn;
1120 struct node_info ni;
1121 struct compress_io_ctx *cic;
1122 pgoff_t start_idx = start_idx_of_cluster(cc);
1123 unsigned int last_index = cc->cluster_size - 1;
1124 loff_t psize;
1125 int i, err;
1126
79963d96
CY		 1127 if (IS_NOQUOTA(inode)) {
1128 /*
1129 * We need to wait for node_write to avoid block allocation during
1130 * checkpoint. This can only happen to quota writes which can cause
1131 * the below discard race condition.
1132 */
1133 down_read(&sbi->node_write);
1134 } else if (!f2fs_trylock_op(sbi)) {
df77fbd8 1135 return -EAGAIN;
79963d96 1136 }
4c8ff709 1137
df77fbd8 1138 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
4c8ff709
CY		 1139
1140 err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1141 if (err)
1142 goto out_unlock_op;
1143
1144 for (i = 0; i < cc->cluster_size; i++) {
a2ced1ce 1145 if (data_blkaddr(dn.inode, dn.node_page,
4c8ff709
CY		 1146 dn.ofs_in_node + i) == NULL_ADDR)
1147 goto out_put_dnode;
1148 }
1149
1150 psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1151
1152 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1153 if (err)
1154 goto out_put_dnode;
1155
1156 fio.version = ni.version;
1157
1158 cic = f2fs_kzalloc(sbi, sizeof(struct compress_io_ctx), GFP_NOFS);
1159 if (!cic)
1160 goto out_put_dnode;
1161
1162 cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1163 cic->inode = inode;
887347a0 1164 refcount_set(&cic->ref, cc->nr_cpages);
4c8ff709
CY		 1165 cic->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
1166 cc->log_cluster_size, GFP_NOFS);
1167 if (!cic->rpages)
1168 goto out_put_cic;
1169
1170 cic->nr_rpages = cc->cluster_size;
1171
1172 for (i = 0; i < cc->nr_cpages; i++) {
1173 f2fs_set_compressed_page(cc->cpages[i], inode,
887347a0 1174 cc->rpages[i + 1]->index, cic);
4c8ff709 1175 fio.compressed_page = cc->cpages[i];
f567adb0
CY		 1176
1177 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1178 dn.ofs_in_node + i + 1);
1179
1180 /* wait for GCed page writeback via META_MAPPING */
1181 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1182
4c8ff709
CY		 1183 if (fio.encrypted) {
1184 fio.page = cc->rpages[i + 1];
1185 err = f2fs_encrypt_one_page(&fio);
1186 if (err)
1187 goto out_destroy_crypt;
1188 cc->cpages[i] = fio.encrypted_page;
1189 }
1190 }
1191
1192 set_cluster_writeback(cc);
1193
1194 for (i = 0; i < cc->cluster_size; i++)
1195 cic->rpages[i] = cc->rpages[i];
1196
1197 for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1198 block_t blkaddr;
1199
a2ced1ce 1200 blkaddr = f2fs_data_blkaddr(&dn);
95978caa 1201 fio.page = cc->rpages[i];
4c8ff709
CY		 1202 fio.old_blkaddr = blkaddr;
1203
1204 /* cluster header */
1205 if (i == 0) {
1206 if (blkaddr == COMPRESS_ADDR)
1207 fio.compr_blocks++;
1208 if (__is_valid_data_blkaddr(blkaddr))
1209 f2fs_invalidate_blocks(sbi, blkaddr);
1210 f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1211 goto unlock_continue;
1212 }
1213
1214 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1215 fio.compr_blocks++;
1216
1217 if (i > cc->nr_cpages) {
1218 if (__is_valid_data_blkaddr(blkaddr)) {
1219 f2fs_invalidate_blocks(sbi, blkaddr);
1220 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1221 }
1222 goto unlock_continue;
1223 }
1224
1225 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1226
1227 if (fio.encrypted)
1228 fio.encrypted_page = cc->cpages[i - 1];
1229 else
1230 fio.compressed_page = cc->cpages[i - 1];
1231
1232 cc->cpages[i - 1] = NULL;
1233 f2fs_outplace_write_data(&dn, &fio);
1234 (*submitted)++;
1235unlock_continue:
1236 inode_dec_dirty_pages(cc->inode);
1237 unlock_page(fio.page);
1238 }
1239
1240 if (fio.compr_blocks)
1241 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1242 f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1243
1244 set_inode_flag(cc->inode, FI_APPEND_WRITE);
1245 if (cc->cluster_idx == 0)
1246 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1247
1248 f2fs_put_dnode(&dn);
79963d96
CY		 1249 if (IS_NOQUOTA(inode))
1250 up_read(&sbi->node_write);
1251 else
435cbab9 1252 f2fs_unlock_op(sbi);
4c8ff709 1253
c10c9820 1254 spin_lock(&fi->i_size_lock);
4c8ff709
CY		 1255 if (fi->last_disk_size < psize)
1256 fi->last_disk_size = psize;
c10c9820 1257 spin_unlock(&fi->i_size_lock);
4c8ff709
CY		 1258
1259 f2fs_put_rpages(cc);
1260 f2fs_destroy_compress_ctx(cc);
1261 return 0;
1262
1263out_destroy_crypt:
1264 kfree(cic->rpages);
1265
1266 for (--i; i >= 0; i--)
1267 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1268 for (i = 0; i < cc->nr_cpages; i++) {
1269 if (!cc->cpages[i])
1270 continue;
1271 f2fs_put_page(cc->cpages[i], 1);
1272 }
1273out_put_cic:
1274 kfree(cic);
1275out_put_dnode:
1276 f2fs_put_dnode(&dn);
1277out_unlock_op:
79963d96
CY		 1278 if (IS_NOQUOTA(inode))
1279 up_read(&sbi->node_write);
1280 else
435cbab9 1281 f2fs_unlock_op(sbi);
4c8ff709
CY		 1282 return -EAGAIN;
1283}
1284
1285void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1286{
1287 struct f2fs_sb_info *sbi = bio->bi_private;
1288 struct compress_io_ctx *cic =
1289 (struct compress_io_ctx *)page_private(page);
1290 int i;
1291
1292 if (unlikely(bio->bi_status))
1293 mapping_set_error(cic->inode->i_mapping, -EIO);
1294
5e6bbde9 1295 f2fs_compress_free_page(page);
4c8ff709
CY		 1296
1297 dec_page_count(sbi, F2FS_WB_DATA);
1298
1299 if (refcount_dec_not_one(&cic->ref))
1300 return;
1301
1302 for (i = 0; i < cic->nr_rpages; i++) {
1303 WARN_ON(!cic->rpages[i]);
1304 clear_cold_data(cic->rpages[i]);
1305 end_page_writeback(cic->rpages[i]);
1306 }
1307
1308 kfree(cic->rpages);
1309 kfree(cic);
1310}
1311
1312static int f2fs_write_raw_pages(struct compress_ctx *cc,
1313 int *submitted,
1314 struct writeback_control *wbc,
1315 enum iostat_type io_type)
1316{
1317 struct address_space *mapping = cc->inode->i_mapping;
1318 int _submitted, compr_blocks, ret;
1319 int i = -1, err = 0;
1320
1321 compr_blocks = f2fs_compressed_blocks(cc);
1322 if (compr_blocks < 0) {
1323 err = compr_blocks;
1324 goto out_err;
1325 }
1326
1327 for (i = 0; i < cc->cluster_size; i++) {
1328 if (!cc->rpages[i])
1329 continue;
1330retry_write:
1331 if (cc->rpages[i]->mapping != mapping) {
1332 unlock_page(cc->rpages[i]);
1333 continue;
1334 }
1335
1336 BUG_ON(!PageLocked(cc->rpages[i]));
1337
1338 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1339 NULL, NULL, wbc, io_type,
1340 compr_blocks);
1341 if (ret) {
1342 if (ret == AOP_WRITEPAGE_ACTIVATE) {
1343 unlock_page(cc->rpages[i]);
1344 ret = 0;
1345 } else if (ret == -EAGAIN) {
466357dc
CY		 1346 /*
1347 * for quota file, just redirty left pages to
1348 * avoid deadlock caused by cluster update race
1349 * from foreground operation.
1350 */
1351 if (IS_NOQUOTA(cc->inode)) {
1352 err = 0;
1353 goto out_err;
1354 }
4c8ff709
CY		 1355 ret = 0;
1356 cond_resched();
5df7731f
CY		 1357 congestion_wait(BLK_RW_ASYNC,
1358 DEFAULT_IO_TIMEOUT);
4c8ff709 1359 lock_page(cc->rpages[i]);
eb1353cf
CY		 1360
1361 if (!PageDirty(cc->rpages[i])) {
1362 unlock_page(cc->rpages[i]);
1363 continue;
1364 }
1365
4c8ff709
CY		 1366 clear_page_dirty_for_io(cc->rpages[i]);
1367 goto retry_write;
1368 }
1369 err = ret;
466357dc 1370 goto out_err;
4c8ff709
CY		 1371 }
1372
1373 *submitted += _submitted;
1374 }
1375 return 0;
4c8ff709
CY		 1376out_err:
1377 for (++i; i < cc->cluster_size; i++) {
1378 if (!cc->rpages[i])
1379 continue;
1380 redirty_page_for_writepage(wbc, cc->rpages[i]);
1381 unlock_page(cc->rpages[i]);
1382 }
1383 return err;
1384}
1385
1386int f2fs_write_multi_pages(struct compress_ctx *cc,
1387 int *submitted,
1388 struct writeback_control *wbc,
1389 enum iostat_type io_type)
1390{
1391 struct f2fs_inode_info *fi = F2FS_I(cc->inode);
1392 const struct f2fs_compress_ops *cops =
1393 f2fs_cops[fi->i_compress_algorithm];
1394 int err;
1395
1396 *submitted = 0;
1397 if (cluster_may_compress(cc)) {
1398 err = f2fs_compress_pages(cc);
1399 if (err == -EAGAIN) {
1400 goto write;
1401 } else if (err) {
1402 f2fs_put_rpages_wbc(cc, wbc, true, 1);
1403 goto destroy_out;
1404 }
1405
1406 err = f2fs_write_compressed_pages(cc, submitted,
1407 wbc, io_type);
1408 cops->destroy_compress_ctx(cc);
02772fbf
CY		 1409 kfree(cc->cpages);
1410 cc->cpages = NULL;
4c8ff709
CY		 1411 if (!err)
1412 return 0;
1413 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1414 }
1415write:
1416 f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1417
1418 err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1419 f2fs_put_rpages_wbc(cc, wbc, false, 0);
1420destroy_out:
1421 f2fs_destroy_compress_ctx(cc);
1422 return err;
1423}
1424
1425struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1426{
1427 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1428 struct decompress_io_ctx *dic;
1429 pgoff_t start_idx = start_idx_of_cluster(cc);
1430 int i;
1431
1432 dic = f2fs_kzalloc(sbi, sizeof(struct decompress_io_ctx), GFP_NOFS);
1433 if (!dic)
1434 return ERR_PTR(-ENOMEM);
1435
1436 dic->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
1437 cc->log_cluster_size, GFP_NOFS);
1438 if (!dic->rpages) {
1439 kfree(dic);
1440 return ERR_PTR(-ENOMEM);
1441 }
1442
1443 dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1444 dic->inode = cc->inode;
887347a0 1445 refcount_set(&dic->ref, cc->nr_cpages);
4c8ff709
CY		 1446 dic->cluster_idx = cc->cluster_idx;
1447 dic->cluster_size = cc->cluster_size;
1448 dic->log_cluster_size = cc->log_cluster_size;
1449 dic->nr_cpages = cc->nr_cpages;
1450 dic->failed = false;
1451
1452 for (i = 0; i < dic->cluster_size; i++)
1453 dic->rpages[i] = cc->rpages[i];
1454 dic->nr_rpages = cc->cluster_size;
1455
1456 dic->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
1457 dic->nr_cpages, GFP_NOFS);
1458 if (!dic->cpages)
1459 goto out_free;
1460
1461 for (i = 0; i < dic->nr_cpages; i++) {
1462 struct page *page;
1463
5e6bbde9 1464 page = f2fs_compress_alloc_page();
4c8ff709
CY		 1465 if (!page)
1466 goto out_free;
1467
1468 f2fs_set_compressed_page(page, cc->inode,
887347a0 1469 start_idx + i + 1, dic);
4c8ff709
CY		 1470 dic->cpages[i] = page;
1471 }
1472
4c8ff709
CY		 1473 return dic;
1474
1475out_free:
1476 f2fs_free_dic(dic);
1477 return ERR_PTR(-ENOMEM);
1478}
1479
1480void f2fs_free_dic(struct decompress_io_ctx *dic)
1481{
1482 int i;
1483
1484 if (dic->tpages) {
1485 for (i = 0; i < dic->cluster_size; i++) {
1486 if (dic->rpages[i])
1487 continue;
8908e753
CY		 1488 if (!dic->tpages[i])
1489 continue;
5e6bbde9 1490 f2fs_compress_free_page(dic->tpages[i]);
4c8ff709
CY		 1491 }
1492 kfree(dic->tpages);
1493 }
1494
1495 if (dic->cpages) {
1496 for (i = 0; i < dic->nr_cpages; i++) {
1497 if (!dic->cpages[i])
1498 continue;
5e6bbde9 1499 f2fs_compress_free_page(dic->cpages[i]);
4c8ff709
CY		 1500 }
1501 kfree(dic->cpages);
1502 }
1503
1504 kfree(dic->rpages);
1505 kfree(dic);
1506}
1507
1508void f2fs_decompress_end_io(struct page **rpages,
1509 unsigned int cluster_size, bool err, bool verity)
1510{
1511 int i;
1512
1513 for (i = 0; i < cluster_size; i++) {
1514 struct page *rpage = rpages[i];
1515
1516 if (!rpage)
1517 continue;
1518
23c51bed
CY		 1519 if (err || PageError(rpage))
1520 goto clear_uptodate;
1521
1522 if (!verity || fsverity_verify_page(rpage)) {
1523 SetPageUptodate(rpage);
1524 goto unlock;
4c8ff709 1525 }
23c51bed
CY		 1526clear_uptodate:
1527 ClearPageUptodate(rpage);
1528 ClearPageError(rpage);
1529unlock:
4c8ff709
CY		 1530 unlock_page(rpage);
1531 }
1532}
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