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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * f2fs compress support
4 *
5 * Copyright (c) 2019 Chao Yu <chao@kernel.org>
6 */
7
8#include <linux/fs.h>
9#include <linux/f2fs_fs.h>
10#include <linux/moduleparam.h>
11#include <linux/writeback.h>
12#include <linux/backing-dev.h>
13#include <linux/lzo.h>
14#include <linux/lz4.h>
15#include <linux/zstd.h>
16#include <linux/pagevec.h>
17
18#include "f2fs.h"
19#include "node.h"
20#include "segment.h"
21#include <trace/events/f2fs.h>
22
23static struct kmem_cache *cic_entry_slab;
24static struct kmem_cache *dic_entry_slab;
25
26static void *page_array_alloc(struct inode *inode, int nr)
27{
28 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
29 unsigned int size = sizeof(struct page *) * nr;
30
31 if (likely(size <= sbi->page_array_slab_size))
32 return f2fs_kmem_cache_alloc(sbi->page_array_slab,
33 GFP_F2FS_ZERO, false, F2FS_I_SB(inode));
34 return f2fs_kzalloc(sbi, size, GFP_NOFS);
35}
36
37static void page_array_free(struct inode *inode, void *pages, int nr)
38{
39 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
40 unsigned int size = sizeof(struct page *) * nr;
41
42 if (!pages)
43 return;
44
45 if (likely(size <= sbi->page_array_slab_size))
46 kmem_cache_free(sbi->page_array_slab, pages);
47 else
48 kfree(pages);
49}
50
51struct f2fs_compress_ops {
52 int (*init_compress_ctx)(struct compress_ctx *cc);
53 void (*destroy_compress_ctx)(struct compress_ctx *cc);
54 int (*compress_pages)(struct compress_ctx *cc);
55 int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
56 void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
57 int (*decompress_pages)(struct decompress_io_ctx *dic);
58};
59
60static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
61{
62 return index & (cc->cluster_size - 1);
63}
64
65static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
66{
67 return index >> cc->log_cluster_size;
68}
69
70static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
71{
72 return cc->cluster_idx << cc->log_cluster_size;
73}
74
75bool f2fs_is_compressed_page(struct page *page)
76{
77 if (!PagePrivate(page))
78 return false;
79 if (!page_private(page))
80 return false;
81 if (page_private_nonpointer(page))
82 return false;
83
84 f2fs_bug_on(F2FS_M_SB(page->mapping),
85 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
86 return true;
87}
88
89static void f2fs_set_compressed_page(struct page *page,
90 struct inode *inode, pgoff_t index, void *data)
91{
92 attach_page_private(page, (void *)data);
93
94 /* i_crypto_info and iv index */
95 page->index = index;
96 page->mapping = inode->i_mapping;
97}
98
99static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
100{
101 int i;
102
103 for (i = 0; i < len; i++) {
104 if (!cc->rpages[i])
105 continue;
106 if (unlock)
107 unlock_page(cc->rpages[i]);
108 else
109 put_page(cc->rpages[i]);
110 }
111}
112
113static void f2fs_put_rpages(struct compress_ctx *cc)
114{
115 f2fs_drop_rpages(cc, cc->cluster_size, false);
116}
117
118static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
119{
120 f2fs_drop_rpages(cc, len, true);
121}
122
123static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
124 struct writeback_control *wbc, bool redirty, int unlock)
125{
126 unsigned int i;
127
128 for (i = 0; i < cc->cluster_size; i++) {
129 if (!cc->rpages[i])
130 continue;
131 if (redirty)
132 redirty_page_for_writepage(wbc, cc->rpages[i]);
133 f2fs_put_page(cc->rpages[i], unlock);
134 }
135}
136
137struct page *f2fs_compress_control_page(struct page *page)
138{
139 return ((struct compress_io_ctx *)page_private(page))->rpages[0];
140}
141
142int f2fs_init_compress_ctx(struct compress_ctx *cc)
143{
144 if (cc->rpages)
145 return 0;
146
147 cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
148 return cc->rpages ? 0 : -ENOMEM;
149}
150
151void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
152{
153 page_array_free(cc->inode, cc->rpages, cc->cluster_size);
154 cc->rpages = NULL;
155 cc->nr_rpages = 0;
156 cc->nr_cpages = 0;
157 cc->valid_nr_cpages = 0;
158 if (!reuse)
159 cc->cluster_idx = NULL_CLUSTER;
160}
161
162void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
163{
164 unsigned int cluster_ofs;
165
166 if (!f2fs_cluster_can_merge_page(cc, page->index))
167 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
168
169 cluster_ofs = offset_in_cluster(cc, page->index);
170 cc->rpages[cluster_ofs] = page;
171 cc->nr_rpages++;
172 cc->cluster_idx = cluster_idx(cc, page->index);
173}
174
175#ifdef CONFIG_F2FS_FS_LZO
176static int lzo_init_compress_ctx(struct compress_ctx *cc)
177{
178 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
179 LZO1X_MEM_COMPRESS, GFP_NOFS);
180 if (!cc->private)
181 return -ENOMEM;
182
183 cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
184 return 0;
185}
186
187static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
188{
189 kvfree(cc->private);
190 cc->private = NULL;
191}
192
193static int lzo_compress_pages(struct compress_ctx *cc)
194{
195 int ret;
196
197 ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
198 &cc->clen, cc->private);
199 if (ret != LZO_E_OK) {
200 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
201 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
202 return -EIO;
203 }
204 return 0;
205}
206
207static int lzo_decompress_pages(struct decompress_io_ctx *dic)
208{
209 int ret;
210
211 ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
212 dic->rbuf, &dic->rlen);
213 if (ret != LZO_E_OK) {
214 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
215 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
216 return -EIO;
217 }
218
219 if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
220 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
221 "expected:%lu\n", KERN_ERR,
222 F2FS_I_SB(dic->inode)->sb->s_id,
223 dic->rlen,
224 PAGE_SIZE << dic->log_cluster_size);
225 return -EIO;
226 }
227 return 0;
228}
229
230static const struct f2fs_compress_ops f2fs_lzo_ops = {
231 .init_compress_ctx = lzo_init_compress_ctx,
232 .destroy_compress_ctx = lzo_destroy_compress_ctx,
233 .compress_pages = lzo_compress_pages,
234 .decompress_pages = lzo_decompress_pages,
235};
236#endif
237
238#ifdef CONFIG_F2FS_FS_LZ4
239static int lz4_init_compress_ctx(struct compress_ctx *cc)
240{
241 unsigned int size = LZ4_MEM_COMPRESS;
242
243#ifdef CONFIG_F2FS_FS_LZ4HC
244 if (F2FS_I(cc->inode)->i_compress_flag >> COMPRESS_LEVEL_OFFSET)
245 size = LZ4HC_MEM_COMPRESS;
246#endif
247
248 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
249 if (!cc->private)
250 return -ENOMEM;
251
252 /*
253 * we do not change cc->clen to LZ4_compressBound(inputsize) to
254 * adapt worst compress case, because lz4 compressor can handle
255 * output budget properly.
256 */
257 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
258 return 0;
259}
260
261static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
262{
263 kvfree(cc->private);
264 cc->private = NULL;
265}
266
267#ifdef CONFIG_F2FS_FS_LZ4HC
268static int lz4hc_compress_pages(struct compress_ctx *cc)
269{
270 unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
271 COMPRESS_LEVEL_OFFSET;
272 int len;
273
274 if (level)
275 len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
276 cc->clen, level, cc->private);
277 else
278 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
279 cc->clen, cc->private);
280 if (!len)
281 return -EAGAIN;
282
283 cc->clen = len;
284 return 0;
285}
286#endif
287
288static int lz4_compress_pages(struct compress_ctx *cc)
289{
290 int len;
291
292#ifdef CONFIG_F2FS_FS_LZ4HC
293 return lz4hc_compress_pages(cc);
294#endif
295 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
296 cc->clen, cc->private);
297 if (!len)
298 return -EAGAIN;
299
300 cc->clen = len;
301 return 0;
302}
303
304static int lz4_decompress_pages(struct decompress_io_ctx *dic)
305{
306 int ret;
307
308 ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
309 dic->clen, dic->rlen);
310 if (ret < 0) {
311 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
312 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
313 return -EIO;
314 }
315
316 if (ret != PAGE_SIZE << dic->log_cluster_size) {
317 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
318 "expected:%lu\n", KERN_ERR,
319 F2FS_I_SB(dic->inode)->sb->s_id, ret,
320 PAGE_SIZE << dic->log_cluster_size);
321 return -EIO;
322 }
323 return 0;
324}
325
326static const struct f2fs_compress_ops f2fs_lz4_ops = {
327 .init_compress_ctx = lz4_init_compress_ctx,
328 .destroy_compress_ctx = lz4_destroy_compress_ctx,
329 .compress_pages = lz4_compress_pages,
330 .decompress_pages = lz4_decompress_pages,
331};
332#endif
333
334#ifdef CONFIG_F2FS_FS_ZSTD
335#define F2FS_ZSTD_DEFAULT_CLEVEL 1
336
337static int zstd_init_compress_ctx(struct compress_ctx *cc)
338{
339 zstd_parameters params;
340 zstd_cstream *stream;
341 void *workspace;
342 unsigned int workspace_size;
343 unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
344 COMPRESS_LEVEL_OFFSET;
345
346 if (!level)
347 level = F2FS_ZSTD_DEFAULT_CLEVEL;
348
349 params = zstd_get_params(level, cc->rlen);
350 workspace_size = zstd_cstream_workspace_bound(¶ms.cParams);
351
352 workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
353 workspace_size, GFP_NOFS);
354 if (!workspace)
355 return -ENOMEM;
356
357 stream = zstd_init_cstream(¶ms, 0, workspace, workspace_size);
358 if (!stream) {
359 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n",
360 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
361 __func__);
362 kvfree(workspace);
363 return -EIO;
364 }
365
366 cc->private = workspace;
367 cc->private2 = stream;
368
369 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
370 return 0;
371}
372
373static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
374{
375 kvfree(cc->private);
376 cc->private = NULL;
377 cc->private2 = NULL;
378}
379
380static int zstd_compress_pages(struct compress_ctx *cc)
381{
382 zstd_cstream *stream = cc->private2;
383 zstd_in_buffer inbuf;
384 zstd_out_buffer outbuf;
385 int src_size = cc->rlen;
386 int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
387 int ret;
388
389 inbuf.pos = 0;
390 inbuf.src = cc->rbuf;
391 inbuf.size = src_size;
392
393 outbuf.pos = 0;
394 outbuf.dst = cc->cbuf->cdata;
395 outbuf.size = dst_size;
396
397 ret = zstd_compress_stream(stream, &outbuf, &inbuf);
398 if (zstd_is_error(ret)) {
399 printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n",
400 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
401 __func__, zstd_get_error_code(ret));
402 return -EIO;
403 }
404
405 ret = zstd_end_stream(stream, &outbuf);
406 if (zstd_is_error(ret)) {
407 printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n",
408 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
409 __func__, zstd_get_error_code(ret));
410 return -EIO;
411 }
412
413 /*
414 * there is compressed data remained in intermediate buffer due to
415 * no more space in cbuf.cdata
416 */
417 if (ret)
418 return -EAGAIN;
419
420 cc->clen = outbuf.pos;
421 return 0;
422}
423
424static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
425{
426 zstd_dstream *stream;
427 void *workspace;
428 unsigned int workspace_size;
429 unsigned int max_window_size =
430 MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
431
432 workspace_size = zstd_dstream_workspace_bound(max_window_size);
433
434 workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
435 workspace_size, GFP_NOFS);
436 if (!workspace)
437 return -ENOMEM;
438
439 stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
440 if (!stream) {
441 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n",
442 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
443 __func__);
444 kvfree(workspace);
445 return -EIO;
446 }
447
448 dic->private = workspace;
449 dic->private2 = stream;
450
451 return 0;
452}
453
454static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
455{
456 kvfree(dic->private);
457 dic->private = NULL;
458 dic->private2 = NULL;
459}
460
461static int zstd_decompress_pages(struct decompress_io_ctx *dic)
462{
463 zstd_dstream *stream = dic->private2;
464 zstd_in_buffer inbuf;
465 zstd_out_buffer outbuf;
466 int ret;
467
468 inbuf.pos = 0;
469 inbuf.src = dic->cbuf->cdata;
470 inbuf.size = dic->clen;
471
472 outbuf.pos = 0;
473 outbuf.dst = dic->rbuf;
474 outbuf.size = dic->rlen;
475
476 ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
477 if (zstd_is_error(ret)) {
478 printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n",
479 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
480 __func__, zstd_get_error_code(ret));
481 return -EIO;
482 }
483
484 if (dic->rlen != outbuf.pos) {
485 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
486 "expected:%lu\n", KERN_ERR,
487 F2FS_I_SB(dic->inode)->sb->s_id,
488 __func__, dic->rlen,
489 PAGE_SIZE << dic->log_cluster_size);
490 return -EIO;
491 }
492
493 return 0;
494}
495
496static const struct f2fs_compress_ops f2fs_zstd_ops = {
497 .init_compress_ctx = zstd_init_compress_ctx,
498 .destroy_compress_ctx = zstd_destroy_compress_ctx,
499 .compress_pages = zstd_compress_pages,
500 .init_decompress_ctx = zstd_init_decompress_ctx,
501 .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
502 .decompress_pages = zstd_decompress_pages,
503};
504#endif
505
506#ifdef CONFIG_F2FS_FS_LZO
507#ifdef CONFIG_F2FS_FS_LZORLE
508static int lzorle_compress_pages(struct compress_ctx *cc)
509{
510 int ret;
511
512 ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
513 &cc->clen, cc->private);
514 if (ret != LZO_E_OK) {
515 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
516 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
517 return -EIO;
518 }
519 return 0;
520}
521
522static const struct f2fs_compress_ops f2fs_lzorle_ops = {
523 .init_compress_ctx = lzo_init_compress_ctx,
524 .destroy_compress_ctx = lzo_destroy_compress_ctx,
525 .compress_pages = lzorle_compress_pages,
526 .decompress_pages = lzo_decompress_pages,
527};
528#endif
529#endif
530
531static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
532#ifdef CONFIG_F2FS_FS_LZO
533 &f2fs_lzo_ops,
534#else
535 NULL,
536#endif
537#ifdef CONFIG_F2FS_FS_LZ4
538 &f2fs_lz4_ops,
539#else
540 NULL,
541#endif
542#ifdef CONFIG_F2FS_FS_ZSTD
543 &f2fs_zstd_ops,
544#else
545 NULL,
546#endif
547#if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
548 &f2fs_lzorle_ops,
549#else
550 NULL,
551#endif
552};
553
554bool f2fs_is_compress_backend_ready(struct inode *inode)
555{
556 if (!f2fs_compressed_file(inode))
557 return true;
558 return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
559}
560
561static mempool_t *compress_page_pool;
562static int num_compress_pages = 512;
563module_param(num_compress_pages, uint, 0444);
564MODULE_PARM_DESC(num_compress_pages,
565 "Number of intermediate compress pages to preallocate");
566
567int f2fs_init_compress_mempool(void)
568{
569 compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
570 return compress_page_pool ? 0 : -ENOMEM;
571}
572
573void f2fs_destroy_compress_mempool(void)
574{
575 mempool_destroy(compress_page_pool);
576}
577
578static struct page *f2fs_compress_alloc_page(void)
579{
580 struct page *page;
581
582 page = mempool_alloc(compress_page_pool, GFP_NOFS);
583 lock_page(page);
584
585 return page;
586}
587
588static void f2fs_compress_free_page(struct page *page)
589{
590 if (!page)
591 return;
592 detach_page_private(page);
593 page->mapping = NULL;
594 unlock_page(page);
595 mempool_free(page, compress_page_pool);
596}
597
598#define MAX_VMAP_RETRIES 3
599
600static void *f2fs_vmap(struct page **pages, unsigned int count)
601{
602 int i;
603 void *buf = NULL;
604
605 for (i = 0; i < MAX_VMAP_RETRIES; i++) {
606 buf = vm_map_ram(pages, count, -1);
607 if (buf)
608 break;
609 vm_unmap_aliases();
610 }
611 return buf;
612}
613
614static int f2fs_compress_pages(struct compress_ctx *cc)
615{
616 struct f2fs_inode_info *fi = F2FS_I(cc->inode);
617 const struct f2fs_compress_ops *cops =
618 f2fs_cops[fi->i_compress_algorithm];
619 unsigned int max_len, new_nr_cpages;
620 u32 chksum = 0;
621 int i, ret;
622
623 trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
624 cc->cluster_size, fi->i_compress_algorithm);
625
626 if (cops->init_compress_ctx) {
627 ret = cops->init_compress_ctx(cc);
628 if (ret)
629 goto out;
630 }
631
632 max_len = COMPRESS_HEADER_SIZE + cc->clen;
633 cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
634 cc->valid_nr_cpages = cc->nr_cpages;
635
636 cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
637 if (!cc->cpages) {
638 ret = -ENOMEM;
639 goto destroy_compress_ctx;
640 }
641
642 for (i = 0; i < cc->nr_cpages; i++) {
643 cc->cpages[i] = f2fs_compress_alloc_page();
644 if (!cc->cpages[i]) {
645 ret = -ENOMEM;
646 goto out_free_cpages;
647 }
648 }
649
650 cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
651 if (!cc->rbuf) {
652 ret = -ENOMEM;
653 goto out_free_cpages;
654 }
655
656 cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
657 if (!cc->cbuf) {
658 ret = -ENOMEM;
659 goto out_vunmap_rbuf;
660 }
661
662 ret = cops->compress_pages(cc);
663 if (ret)
664 goto out_vunmap_cbuf;
665
666 max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
667
668 if (cc->clen > max_len) {
669 ret = -EAGAIN;
670 goto out_vunmap_cbuf;
671 }
672
673 cc->cbuf->clen = cpu_to_le32(cc->clen);
674
675 if (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)
676 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
677 cc->cbuf->cdata, cc->clen);
678 cc->cbuf->chksum = cpu_to_le32(chksum);
679
680 for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
681 cc->cbuf->reserved[i] = cpu_to_le32(0);
682
683 new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
684
685 /* zero out any unused part of the last page */
686 memset(&cc->cbuf->cdata[cc->clen], 0,
687 (new_nr_cpages * PAGE_SIZE) -
688 (cc->clen + COMPRESS_HEADER_SIZE));
689
690 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
691 vm_unmap_ram(cc->rbuf, cc->cluster_size);
692
693 for (i = 0; i < cc->nr_cpages; i++) {
694 if (i < new_nr_cpages)
695 continue;
696 f2fs_compress_free_page(cc->cpages[i]);
697 cc->cpages[i] = NULL;
698 }
699
700 if (cops->destroy_compress_ctx)
701 cops->destroy_compress_ctx(cc);
702
703 cc->valid_nr_cpages = new_nr_cpages;
704
705 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
706 cc->clen, ret);
707 return 0;
708
709out_vunmap_cbuf:
710 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
711out_vunmap_rbuf:
712 vm_unmap_ram(cc->rbuf, cc->cluster_size);
713out_free_cpages:
714 for (i = 0; i < cc->nr_cpages; i++) {
715 if (cc->cpages[i])
716 f2fs_compress_free_page(cc->cpages[i]);
717 }
718 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
719 cc->cpages = NULL;
720destroy_compress_ctx:
721 if (cops->destroy_compress_ctx)
722 cops->destroy_compress_ctx(cc);
723out:
724 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
725 cc->clen, ret);
726 return ret;
727}
728
729static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
730 bool pre_alloc);
731static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
732 bool bypass_destroy_callback, bool pre_alloc);
733
734void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
735{
736 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
737 struct f2fs_inode_info *fi = F2FS_I(dic->inode);
738 const struct f2fs_compress_ops *cops =
739 f2fs_cops[fi->i_compress_algorithm];
740 bool bypass_callback = false;
741 int ret;
742
743 trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
744 dic->cluster_size, fi->i_compress_algorithm);
745
746 if (dic->failed) {
747 ret = -EIO;
748 goto out_end_io;
749 }
750
751 ret = f2fs_prepare_decomp_mem(dic, false);
752 if (ret) {
753 bypass_callback = true;
754 goto out_release;
755 }
756
757 dic->clen = le32_to_cpu(dic->cbuf->clen);
758 dic->rlen = PAGE_SIZE << dic->log_cluster_size;
759
760 if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
761 ret = -EFSCORRUPTED;
762 f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
763 goto out_release;
764 }
765
766 ret = cops->decompress_pages(dic);
767
768 if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
769 u32 provided = le32_to_cpu(dic->cbuf->chksum);
770 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
771
772 if (provided != calculated) {
773 if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
774 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
775 printk_ratelimited(
776 "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
777 KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
778 provided, calculated);
779 }
780 set_sbi_flag(sbi, SBI_NEED_FSCK);
781 }
782 }
783
784out_release:
785 f2fs_release_decomp_mem(dic, bypass_callback, false);
786
787out_end_io:
788 trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
789 dic->clen, ret);
790 f2fs_decompress_end_io(dic, ret, in_task);
791}
792
793/*
794 * This is called when a page of a compressed cluster has been read from disk
795 * (or failed to be read from disk). It checks whether this page was the last
796 * page being waited on in the cluster, and if so, it decompresses the cluster
797 * (or in the case of a failure, cleans up without actually decompressing).
798 */
799void f2fs_end_read_compressed_page(struct page *page, bool failed,
800 block_t blkaddr, bool in_task)
801{
802 struct decompress_io_ctx *dic =
803 (struct decompress_io_ctx *)page_private(page);
804 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
805
806 dec_page_count(sbi, F2FS_RD_DATA);
807
808 if (failed)
809 WRITE_ONCE(dic->failed, true);
810 else if (blkaddr && in_task)
811 f2fs_cache_compressed_page(sbi, page,
812 dic->inode->i_ino, blkaddr);
813
814 if (atomic_dec_and_test(&dic->remaining_pages))
815 f2fs_decompress_cluster(dic, in_task);
816}
817
818static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
819{
820 if (cc->cluster_idx == NULL_CLUSTER)
821 return true;
822 return cc->cluster_idx == cluster_idx(cc, index);
823}
824
825bool f2fs_cluster_is_empty(struct compress_ctx *cc)
826{
827 return cc->nr_rpages == 0;
828}
829
830static bool f2fs_cluster_is_full(struct compress_ctx *cc)
831{
832 return cc->cluster_size == cc->nr_rpages;
833}
834
835bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
836{
837 if (f2fs_cluster_is_empty(cc))
838 return true;
839 return is_page_in_cluster(cc, index);
840}
841
842bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
843 int index, int nr_pages, bool uptodate)
844{
845 unsigned long pgidx = pages[index]->index;
846 int i = uptodate ? 0 : 1;
847
848 /*
849 * when uptodate set to true, try to check all pages in cluster is
850 * uptodate or not.
851 */
852 if (uptodate && (pgidx % cc->cluster_size))
853 return false;
854
855 if (nr_pages - index < cc->cluster_size)
856 return false;
857
858 for (; i < cc->cluster_size; i++) {
859 if (pages[index + i]->index != pgidx + i)
860 return false;
861 if (uptodate && !PageUptodate(pages[index + i]))
862 return false;
863 }
864
865 return true;
866}
867
868static bool cluster_has_invalid_data(struct compress_ctx *cc)
869{
870 loff_t i_size = i_size_read(cc->inode);
871 unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
872 int i;
873
874 for (i = 0; i < cc->cluster_size; i++) {
875 struct page *page = cc->rpages[i];
876
877 f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
878
879 /* beyond EOF */
880 if (page->index >= nr_pages)
881 return true;
882 }
883 return false;
884}
885
886bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
887{
888 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
889 unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
890 bool compressed = dn->data_blkaddr == COMPRESS_ADDR;
891 int cluster_end = 0;
892 int i;
893 char *reason = "";
894
895 if (!compressed)
896 return false;
897
898 /* [..., COMPR_ADDR, ...] */
899 if (dn->ofs_in_node % cluster_size) {
900 reason = "[*|C|*|*]";
901 goto out;
902 }
903
904 for (i = 1; i < cluster_size; i++) {
905 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
906 dn->ofs_in_node + i);
907
908 /* [COMPR_ADDR, ..., COMPR_ADDR] */
909 if (blkaddr == COMPRESS_ADDR) {
910 reason = "[C|*|C|*]";
911 goto out;
912 }
913 if (!__is_valid_data_blkaddr(blkaddr)) {
914 if (!cluster_end)
915 cluster_end = i;
916 continue;
917 }
918 /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
919 if (cluster_end) {
920 reason = "[C|N|N|V]";
921 goto out;
922 }
923 }
924 return false;
925out:
926 f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
927 dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
928 set_sbi_flag(sbi, SBI_NEED_FSCK);
929 return true;
930}
931
932static int __f2fs_cluster_blocks(struct inode *inode,
933 unsigned int cluster_idx, bool compr)
934{
935 struct dnode_of_data dn;
936 unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
937 unsigned int start_idx = cluster_idx <<
938 F2FS_I(inode)->i_log_cluster_size;
939 int ret;
940
941 set_new_dnode(&dn, inode, NULL, NULL, 0);
942 ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
943 if (ret) {
944 if (ret == -ENOENT)
945 ret = 0;
946 goto fail;
947 }
948
949 if (f2fs_sanity_check_cluster(&dn)) {
950 ret = -EFSCORRUPTED;
951 f2fs_handle_error(F2FS_I_SB(inode), ERROR_CORRUPTED_CLUSTER);
952 goto fail;
953 }
954
955 if (dn.data_blkaddr == COMPRESS_ADDR) {
956 int i;
957
958 ret = 1;
959 for (i = 1; i < cluster_size; i++) {
960 block_t blkaddr;
961
962 blkaddr = data_blkaddr(dn.inode,
963 dn.node_page, dn.ofs_in_node + i);
964 if (compr) {
965 if (__is_valid_data_blkaddr(blkaddr))
966 ret++;
967 } else {
968 if (blkaddr != NULL_ADDR)
969 ret++;
970 }
971 }
972
973 f2fs_bug_on(F2FS_I_SB(inode),
974 !compr && ret != cluster_size &&
975 !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
976 }
977fail:
978 f2fs_put_dnode(&dn);
979 return ret;
980}
981
982/* return # of compressed blocks in compressed cluster */
983static int f2fs_compressed_blocks(struct compress_ctx *cc)
984{
985 return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
986}
987
988/* return # of valid blocks in compressed cluster */
989int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
990{
991 return __f2fs_cluster_blocks(inode,
992 index >> F2FS_I(inode)->i_log_cluster_size,
993 false);
994}
995
996static bool cluster_may_compress(struct compress_ctx *cc)
997{
998 if (!f2fs_need_compress_data(cc->inode))
999 return false;
1000 if (f2fs_is_atomic_file(cc->inode))
1001 return false;
1002 if (!f2fs_cluster_is_full(cc))
1003 return false;
1004 if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
1005 return false;
1006 return !cluster_has_invalid_data(cc);
1007}
1008
1009static void set_cluster_writeback(struct compress_ctx *cc)
1010{
1011 int i;
1012
1013 for (i = 0; i < cc->cluster_size; i++) {
1014 if (cc->rpages[i])
1015 set_page_writeback(cc->rpages[i]);
1016 }
1017}
1018
1019static void set_cluster_dirty(struct compress_ctx *cc)
1020{
1021 int i;
1022
1023 for (i = 0; i < cc->cluster_size; i++)
1024 if (cc->rpages[i])
1025 set_page_dirty(cc->rpages[i]);
1026}
1027
1028static int prepare_compress_overwrite(struct compress_ctx *cc,
1029 struct page **pagep, pgoff_t index, void **fsdata)
1030{
1031 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1032 struct address_space *mapping = cc->inode->i_mapping;
1033 struct page *page;
1034 sector_t last_block_in_bio;
1035 unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1036 pgoff_t start_idx = start_idx_of_cluster(cc);
1037 int i, ret;
1038
1039retry:
1040 ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
1041 if (ret <= 0)
1042 return ret;
1043
1044 ret = f2fs_init_compress_ctx(cc);
1045 if (ret)
1046 return ret;
1047
1048 /* keep page reference to avoid page reclaim */
1049 for (i = 0; i < cc->cluster_size; i++) {
1050 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1051 fgp_flag, GFP_NOFS);
1052 if (!page) {
1053 ret = -ENOMEM;
1054 goto unlock_pages;
1055 }
1056
1057 if (PageUptodate(page))
1058 f2fs_put_page(page, 1);
1059 else
1060 f2fs_compress_ctx_add_page(cc, page);
1061 }
1062
1063 if (!f2fs_cluster_is_empty(cc)) {
1064 struct bio *bio = NULL;
1065
1066 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1067 &last_block_in_bio, false, true);
1068 f2fs_put_rpages(cc);
1069 f2fs_destroy_compress_ctx(cc, true);
1070 if (ret)
1071 goto out;
1072 if (bio)
1073 f2fs_submit_bio(sbi, bio, DATA);
1074
1075 ret = f2fs_init_compress_ctx(cc);
1076 if (ret)
1077 goto out;
1078 }
1079
1080 for (i = 0; i < cc->cluster_size; i++) {
1081 f2fs_bug_on(sbi, cc->rpages[i]);
1082
1083 page = find_lock_page(mapping, start_idx + i);
1084 if (!page) {
1085 /* page can be truncated */
1086 goto release_and_retry;
1087 }
1088
1089 f2fs_wait_on_page_writeback(page, DATA, true, true);
1090 f2fs_compress_ctx_add_page(cc, page);
1091
1092 if (!PageUptodate(page)) {
1093release_and_retry:
1094 f2fs_put_rpages(cc);
1095 f2fs_unlock_rpages(cc, i + 1);
1096 f2fs_destroy_compress_ctx(cc, true);
1097 goto retry;
1098 }
1099 }
1100
1101 if (likely(!ret)) {
1102 *fsdata = cc->rpages;
1103 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1104 return cc->cluster_size;
1105 }
1106
1107unlock_pages:
1108 f2fs_put_rpages(cc);
1109 f2fs_unlock_rpages(cc, i);
1110 f2fs_destroy_compress_ctx(cc, true);
1111out:
1112 return ret;
1113}
1114
1115int f2fs_prepare_compress_overwrite(struct inode *inode,
1116 struct page **pagep, pgoff_t index, void **fsdata)
1117{
1118 struct compress_ctx cc = {
1119 .inode = inode,
1120 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1121 .cluster_size = F2FS_I(inode)->i_cluster_size,
1122 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1123 .rpages = NULL,
1124 .nr_rpages = 0,
1125 };
1126
1127 return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1128}
1129
1130bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1131 pgoff_t index, unsigned copied)
1132
1133{
1134 struct compress_ctx cc = {
1135 .inode = inode,
1136 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1137 .cluster_size = F2FS_I(inode)->i_cluster_size,
1138 .rpages = fsdata,
1139 };
1140 bool first_index = (index == cc.rpages[0]->index);
1141
1142 if (copied)
1143 set_cluster_dirty(&cc);
1144
1145 f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1146 f2fs_destroy_compress_ctx(&cc, false);
1147
1148 return first_index;
1149}
1150
1151int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1152{
1153 void *fsdata = NULL;
1154 struct page *pagep;
1155 int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1156 pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1157 log_cluster_size;
1158 int err;
1159
1160 err = f2fs_is_compressed_cluster(inode, start_idx);
1161 if (err < 0)
1162 return err;
1163
1164 /* truncate normal cluster */
1165 if (!err)
1166 return f2fs_do_truncate_blocks(inode, from, lock);
1167
1168 /* truncate compressed cluster */
1169 err = f2fs_prepare_compress_overwrite(inode, &pagep,
1170 start_idx, &fsdata);
1171
1172 /* should not be a normal cluster */
1173 f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1174
1175 if (err <= 0)
1176 return err;
1177
1178 if (err > 0) {
1179 struct page **rpages = fsdata;
1180 int cluster_size = F2FS_I(inode)->i_cluster_size;
1181 int i;
1182
1183 for (i = cluster_size - 1; i >= 0; i--) {
1184 loff_t start = rpages[i]->index << PAGE_SHIFT;
1185
1186 if (from <= start) {
1187 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1188 } else {
1189 zero_user_segment(rpages[i], from - start,
1190 PAGE_SIZE);
1191 break;
1192 }
1193 }
1194
1195 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1196 }
1197 return 0;
1198}
1199
1200static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1201 int *submitted,
1202 struct writeback_control *wbc,
1203 enum iostat_type io_type)
1204{
1205 struct inode *inode = cc->inode;
1206 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1207 struct f2fs_inode_info *fi = F2FS_I(inode);
1208 struct f2fs_io_info fio = {
1209 .sbi = sbi,
1210 .ino = cc->inode->i_ino,
1211 .type = DATA,
1212 .op = REQ_OP_WRITE,
1213 .op_flags = wbc_to_write_flags(wbc),
1214 .old_blkaddr = NEW_ADDR,
1215 .page = NULL,
1216 .encrypted_page = NULL,
1217 .compressed_page = NULL,
1218 .submitted = false,
1219 .io_type = io_type,
1220 .io_wbc = wbc,
1221 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1222 };
1223 struct dnode_of_data dn;
1224 struct node_info ni;
1225 struct compress_io_ctx *cic;
1226 pgoff_t start_idx = start_idx_of_cluster(cc);
1227 unsigned int last_index = cc->cluster_size - 1;
1228 loff_t psize;
1229 int i, err;
1230
1231 /* we should bypass data pages to proceed the kworkder jobs */
1232 if (unlikely(f2fs_cp_error(sbi))) {
1233 mapping_set_error(cc->rpages[0]->mapping, -EIO);
1234 goto out_free;
1235 }
1236
1237 if (IS_NOQUOTA(inode)) {
1238 /*
1239 * We need to wait for node_write to avoid block allocation during
1240 * checkpoint. This can only happen to quota writes which can cause
1241 * the below discard race condition.
1242 */
1243 f2fs_down_read(&sbi->node_write);
1244 } else if (!f2fs_trylock_op(sbi)) {
1245 goto out_free;
1246 }
1247
1248 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1249
1250 err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1251 if (err)
1252 goto out_unlock_op;
1253
1254 for (i = 0; i < cc->cluster_size; i++) {
1255 if (data_blkaddr(dn.inode, dn.node_page,
1256 dn.ofs_in_node + i) == NULL_ADDR)
1257 goto out_put_dnode;
1258 }
1259
1260 psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1261
1262 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
1263 if (err)
1264 goto out_put_dnode;
1265
1266 fio.version = ni.version;
1267
1268 cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1269 if (!cic)
1270 goto out_put_dnode;
1271
1272 cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1273 cic->inode = inode;
1274 atomic_set(&cic->pending_pages, cc->valid_nr_cpages);
1275 cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1276 if (!cic->rpages)
1277 goto out_put_cic;
1278
1279 cic->nr_rpages = cc->cluster_size;
1280
1281 for (i = 0; i < cc->valid_nr_cpages; i++) {
1282 f2fs_set_compressed_page(cc->cpages[i], inode,
1283 cc->rpages[i + 1]->index, cic);
1284 fio.compressed_page = cc->cpages[i];
1285
1286 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1287 dn.ofs_in_node + i + 1);
1288
1289 /* wait for GCed page writeback via META_MAPPING */
1290 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1291
1292 if (fio.encrypted) {
1293 fio.page = cc->rpages[i + 1];
1294 err = f2fs_encrypt_one_page(&fio);
1295 if (err)
1296 goto out_destroy_crypt;
1297 cc->cpages[i] = fio.encrypted_page;
1298 }
1299 }
1300
1301 set_cluster_writeback(cc);
1302
1303 for (i = 0; i < cc->cluster_size; i++)
1304 cic->rpages[i] = cc->rpages[i];
1305
1306 for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1307 block_t blkaddr;
1308
1309 blkaddr = f2fs_data_blkaddr(&dn);
1310 fio.page = cc->rpages[i];
1311 fio.old_blkaddr = blkaddr;
1312
1313 /* cluster header */
1314 if (i == 0) {
1315 if (blkaddr == COMPRESS_ADDR)
1316 fio.compr_blocks++;
1317 if (__is_valid_data_blkaddr(blkaddr))
1318 f2fs_invalidate_blocks(sbi, blkaddr);
1319 f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1320 goto unlock_continue;
1321 }
1322
1323 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1324 fio.compr_blocks++;
1325
1326 if (i > cc->valid_nr_cpages) {
1327 if (__is_valid_data_blkaddr(blkaddr)) {
1328 f2fs_invalidate_blocks(sbi, blkaddr);
1329 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1330 }
1331 goto unlock_continue;
1332 }
1333
1334 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1335
1336 if (fio.encrypted)
1337 fio.encrypted_page = cc->cpages[i - 1];
1338 else
1339 fio.compressed_page = cc->cpages[i - 1];
1340
1341 cc->cpages[i - 1] = NULL;
1342 f2fs_outplace_write_data(&dn, &fio);
1343 (*submitted)++;
1344unlock_continue:
1345 inode_dec_dirty_pages(cc->inode);
1346 unlock_page(fio.page);
1347 }
1348
1349 if (fio.compr_blocks)
1350 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1351 f2fs_i_compr_blocks_update(inode, cc->valid_nr_cpages, true);
1352 add_compr_block_stat(inode, cc->valid_nr_cpages);
1353
1354 set_inode_flag(cc->inode, FI_APPEND_WRITE);
1355 if (cc->cluster_idx == 0)
1356 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1357
1358 f2fs_put_dnode(&dn);
1359 if (IS_NOQUOTA(inode))
1360 f2fs_up_read(&sbi->node_write);
1361 else
1362 f2fs_unlock_op(sbi);
1363
1364 spin_lock(&fi->i_size_lock);
1365 if (fi->last_disk_size < psize)
1366 fi->last_disk_size = psize;
1367 spin_unlock(&fi->i_size_lock);
1368
1369 f2fs_put_rpages(cc);
1370 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1371 cc->cpages = NULL;
1372 f2fs_destroy_compress_ctx(cc, false);
1373 return 0;
1374
1375out_destroy_crypt:
1376 page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1377
1378 for (--i; i >= 0; i--)
1379 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1380out_put_cic:
1381 kmem_cache_free(cic_entry_slab, cic);
1382out_put_dnode:
1383 f2fs_put_dnode(&dn);
1384out_unlock_op:
1385 if (IS_NOQUOTA(inode))
1386 f2fs_up_read(&sbi->node_write);
1387 else
1388 f2fs_unlock_op(sbi);
1389out_free:
1390 for (i = 0; i < cc->valid_nr_cpages; i++) {
1391 f2fs_compress_free_page(cc->cpages[i]);
1392 cc->cpages[i] = NULL;
1393 }
1394 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1395 cc->cpages = NULL;
1396 return -EAGAIN;
1397}
1398
1399void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1400{
1401 struct f2fs_sb_info *sbi = bio->bi_private;
1402 struct compress_io_ctx *cic =
1403 (struct compress_io_ctx *)page_private(page);
1404 int i;
1405
1406 if (unlikely(bio->bi_status))
1407 mapping_set_error(cic->inode->i_mapping, -EIO);
1408
1409 f2fs_compress_free_page(page);
1410
1411 dec_page_count(sbi, F2FS_WB_DATA);
1412
1413 if (atomic_dec_return(&cic->pending_pages))
1414 return;
1415
1416 for (i = 0; i < cic->nr_rpages; i++) {
1417 WARN_ON(!cic->rpages[i]);
1418 clear_page_private_gcing(cic->rpages[i]);
1419 end_page_writeback(cic->rpages[i]);
1420 }
1421
1422 page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1423 kmem_cache_free(cic_entry_slab, cic);
1424}
1425
1426static int f2fs_write_raw_pages(struct compress_ctx *cc,
1427 int *submitted,
1428 struct writeback_control *wbc,
1429 enum iostat_type io_type)
1430{
1431 struct address_space *mapping = cc->inode->i_mapping;
1432 int _submitted, compr_blocks, ret, i;
1433
1434 compr_blocks = f2fs_compressed_blocks(cc);
1435
1436 for (i = 0; i < cc->cluster_size; i++) {
1437 if (!cc->rpages[i])
1438 continue;
1439
1440 redirty_page_for_writepage(wbc, cc->rpages[i]);
1441 unlock_page(cc->rpages[i]);
1442 }
1443
1444 if (compr_blocks < 0)
1445 return compr_blocks;
1446
1447 for (i = 0; i < cc->cluster_size; i++) {
1448 if (!cc->rpages[i])
1449 continue;
1450retry_write:
1451 lock_page(cc->rpages[i]);
1452
1453 if (cc->rpages[i]->mapping != mapping) {
1454continue_unlock:
1455 unlock_page(cc->rpages[i]);
1456 continue;
1457 }
1458
1459 if (!PageDirty(cc->rpages[i]))
1460 goto continue_unlock;
1461
1462 if (!clear_page_dirty_for_io(cc->rpages[i]))
1463 goto continue_unlock;
1464
1465 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1466 NULL, NULL, wbc, io_type,
1467 compr_blocks, false);
1468 if (ret) {
1469 if (ret == AOP_WRITEPAGE_ACTIVATE) {
1470 unlock_page(cc->rpages[i]);
1471 ret = 0;
1472 } else if (ret == -EAGAIN) {
1473 /*
1474 * for quota file, just redirty left pages to
1475 * avoid deadlock caused by cluster update race
1476 * from foreground operation.
1477 */
1478 if (IS_NOQUOTA(cc->inode))
1479 return 0;
1480 ret = 0;
1481 f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
1482 goto retry_write;
1483 }
1484 return ret;
1485 }
1486
1487 *submitted += _submitted;
1488 }
1489
1490 f2fs_balance_fs(F2FS_M_SB(mapping), true);
1491
1492 return 0;
1493}
1494
1495int f2fs_write_multi_pages(struct compress_ctx *cc,
1496 int *submitted,
1497 struct writeback_control *wbc,
1498 enum iostat_type io_type)
1499{
1500 int err;
1501
1502 *submitted = 0;
1503 if (cluster_may_compress(cc)) {
1504 err = f2fs_compress_pages(cc);
1505 if (err == -EAGAIN) {
1506 add_compr_block_stat(cc->inode, cc->cluster_size);
1507 goto write;
1508 } else if (err) {
1509 f2fs_put_rpages_wbc(cc, wbc, true, 1);
1510 goto destroy_out;
1511 }
1512
1513 err = f2fs_write_compressed_pages(cc, submitted,
1514 wbc, io_type);
1515 if (!err)
1516 return 0;
1517 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1518 }
1519write:
1520 f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1521
1522 err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1523 f2fs_put_rpages_wbc(cc, wbc, false, 0);
1524destroy_out:
1525 f2fs_destroy_compress_ctx(cc, false);
1526 return err;
1527}
1528
1529static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
1530 bool pre_alloc)
1531{
1532 return pre_alloc ^ f2fs_low_mem_mode(sbi);
1533}
1534
1535static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
1536 bool pre_alloc)
1537{
1538 const struct f2fs_compress_ops *cops =
1539 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1540 int i;
1541
1542 if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1543 return 0;
1544
1545 dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
1546 if (!dic->tpages)
1547 return -ENOMEM;
1548
1549 for (i = 0; i < dic->cluster_size; i++) {
1550 if (dic->rpages[i]) {
1551 dic->tpages[i] = dic->rpages[i];
1552 continue;
1553 }
1554
1555 dic->tpages[i] = f2fs_compress_alloc_page();
1556 if (!dic->tpages[i])
1557 return -ENOMEM;
1558 }
1559
1560 dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
1561 if (!dic->rbuf)
1562 return -ENOMEM;
1563
1564 dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
1565 if (!dic->cbuf)
1566 return -ENOMEM;
1567
1568 if (cops->init_decompress_ctx)
1569 return cops->init_decompress_ctx(dic);
1570
1571 return 0;
1572}
1573
1574static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
1575 bool bypass_destroy_callback, bool pre_alloc)
1576{
1577 const struct f2fs_compress_ops *cops =
1578 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1579
1580 if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1581 return;
1582
1583 if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
1584 cops->destroy_decompress_ctx(dic);
1585
1586 if (dic->cbuf)
1587 vm_unmap_ram(dic->cbuf, dic->nr_cpages);
1588
1589 if (dic->rbuf)
1590 vm_unmap_ram(dic->rbuf, dic->cluster_size);
1591}
1592
1593static void f2fs_free_dic(struct decompress_io_ctx *dic,
1594 bool bypass_destroy_callback);
1595
1596struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1597{
1598 struct decompress_io_ctx *dic;
1599 pgoff_t start_idx = start_idx_of_cluster(cc);
1600 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1601 int i, ret;
1602
1603 dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1604 if (!dic)
1605 return ERR_PTR(-ENOMEM);
1606
1607 dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1608 if (!dic->rpages) {
1609 kmem_cache_free(dic_entry_slab, dic);
1610 return ERR_PTR(-ENOMEM);
1611 }
1612
1613 dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1614 dic->inode = cc->inode;
1615 atomic_set(&dic->remaining_pages, cc->nr_cpages);
1616 dic->cluster_idx = cc->cluster_idx;
1617 dic->cluster_size = cc->cluster_size;
1618 dic->log_cluster_size = cc->log_cluster_size;
1619 dic->nr_cpages = cc->nr_cpages;
1620 refcount_set(&dic->refcnt, 1);
1621 dic->failed = false;
1622 dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1623
1624 for (i = 0; i < dic->cluster_size; i++)
1625 dic->rpages[i] = cc->rpages[i];
1626 dic->nr_rpages = cc->cluster_size;
1627
1628 dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1629 if (!dic->cpages) {
1630 ret = -ENOMEM;
1631 goto out_free;
1632 }
1633
1634 for (i = 0; i < dic->nr_cpages; i++) {
1635 struct page *page;
1636
1637 page = f2fs_compress_alloc_page();
1638 if (!page) {
1639 ret = -ENOMEM;
1640 goto out_free;
1641 }
1642
1643 f2fs_set_compressed_page(page, cc->inode,
1644 start_idx + i + 1, dic);
1645 dic->cpages[i] = page;
1646 }
1647
1648 ret = f2fs_prepare_decomp_mem(dic, true);
1649 if (ret)
1650 goto out_free;
1651
1652 return dic;
1653
1654out_free:
1655 f2fs_free_dic(dic, true);
1656 return ERR_PTR(ret);
1657}
1658
1659static void f2fs_free_dic(struct decompress_io_ctx *dic,
1660 bool bypass_destroy_callback)
1661{
1662 int i;
1663
1664 f2fs_release_decomp_mem(dic, bypass_destroy_callback, true);
1665
1666 if (dic->tpages) {
1667 for (i = 0; i < dic->cluster_size; i++) {
1668 if (dic->rpages[i])
1669 continue;
1670 if (!dic->tpages[i])
1671 continue;
1672 f2fs_compress_free_page(dic->tpages[i]);
1673 }
1674 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1675 }
1676
1677 if (dic->cpages) {
1678 for (i = 0; i < dic->nr_cpages; i++) {
1679 if (!dic->cpages[i])
1680 continue;
1681 f2fs_compress_free_page(dic->cpages[i]);
1682 }
1683 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1684 }
1685
1686 page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1687 kmem_cache_free(dic_entry_slab, dic);
1688}
1689
1690static void f2fs_late_free_dic(struct work_struct *work)
1691{
1692 struct decompress_io_ctx *dic =
1693 container_of(work, struct decompress_io_ctx, free_work);
1694
1695 f2fs_free_dic(dic, false);
1696}
1697
1698static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
1699{
1700 if (refcount_dec_and_test(&dic->refcnt)) {
1701 if (in_task) {
1702 f2fs_free_dic(dic, false);
1703 } else {
1704 INIT_WORK(&dic->free_work, f2fs_late_free_dic);
1705 queue_work(F2FS_I_SB(dic->inode)->post_read_wq,
1706 &dic->free_work);
1707 }
1708 }
1709}
1710
1711static void f2fs_verify_cluster(struct work_struct *work)
1712{
1713 struct decompress_io_ctx *dic =
1714 container_of(work, struct decompress_io_ctx, verity_work);
1715 int i;
1716
1717 /* Verify, update, and unlock the decompressed pages. */
1718 for (i = 0; i < dic->cluster_size; i++) {
1719 struct page *rpage = dic->rpages[i];
1720
1721 if (!rpage)
1722 continue;
1723
1724 if (fsverity_verify_page(rpage))
1725 SetPageUptodate(rpage);
1726 else
1727 ClearPageUptodate(rpage);
1728 unlock_page(rpage);
1729 }
1730
1731 f2fs_put_dic(dic, true);
1732}
1733
1734/*
1735 * This is called when a compressed cluster has been decompressed
1736 * (or failed to be read and/or decompressed).
1737 */
1738void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
1739 bool in_task)
1740{
1741 int i;
1742
1743 if (!failed && dic->need_verity) {
1744 /*
1745 * Note that to avoid deadlocks, the verity work can't be done
1746 * on the decompression workqueue. This is because verifying
1747 * the data pages can involve reading metadata pages from the
1748 * file, and these metadata pages may be compressed.
1749 */
1750 INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1751 fsverity_enqueue_verify_work(&dic->verity_work);
1752 return;
1753 }
1754
1755 /* Update and unlock the cluster's pagecache pages. */
1756 for (i = 0; i < dic->cluster_size; i++) {
1757 struct page *rpage = dic->rpages[i];
1758
1759 if (!rpage)
1760 continue;
1761
1762 if (failed)
1763 ClearPageUptodate(rpage);
1764 else
1765 SetPageUptodate(rpage);
1766 unlock_page(rpage);
1767 }
1768
1769 /*
1770 * Release the reference to the decompress_io_ctx that was being held
1771 * for I/O completion.
1772 */
1773 f2fs_put_dic(dic, in_task);
1774}
1775
1776/*
1777 * Put a reference to a compressed page's decompress_io_ctx.
1778 *
1779 * This is called when the page is no longer needed and can be freed.
1780 */
1781void f2fs_put_page_dic(struct page *page, bool in_task)
1782{
1783 struct decompress_io_ctx *dic =
1784 (struct decompress_io_ctx *)page_private(page);
1785
1786 f2fs_put_dic(dic, in_task);
1787}
1788
1789/*
1790 * check whether cluster blocks are contiguous, and add extent cache entry
1791 * only if cluster blocks are logically and physically contiguous.
1792 */
1793unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn)
1794{
1795 bool compressed = f2fs_data_blkaddr(dn) == COMPRESS_ADDR;
1796 int i = compressed ? 1 : 0;
1797 block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page,
1798 dn->ofs_in_node + i);
1799
1800 for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
1801 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
1802 dn->ofs_in_node + i);
1803
1804 if (!__is_valid_data_blkaddr(blkaddr))
1805 break;
1806 if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
1807 return 0;
1808 }
1809
1810 return compressed ? i - 1 : i;
1811}
1812
1813const struct address_space_operations f2fs_compress_aops = {
1814 .release_folio = f2fs_release_folio,
1815 .invalidate_folio = f2fs_invalidate_folio,
1816};
1817
1818struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1819{
1820 return sbi->compress_inode->i_mapping;
1821}
1822
1823void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
1824{
1825 if (!sbi->compress_inode)
1826 return;
1827 invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr);
1828}
1829
1830void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1831 nid_t ino, block_t blkaddr)
1832{
1833 struct page *cpage;
1834 int ret;
1835
1836 if (!test_opt(sbi, COMPRESS_CACHE))
1837 return;
1838
1839 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1840 return;
1841
1842 if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
1843 return;
1844
1845 cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
1846 if (cpage) {
1847 f2fs_put_page(cpage, 0);
1848 return;
1849 }
1850
1851 cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
1852 if (!cpage)
1853 return;
1854
1855 ret = add_to_page_cache_lru(cpage, COMPRESS_MAPPING(sbi),
1856 blkaddr, GFP_NOFS);
1857 if (ret) {
1858 f2fs_put_page(cpage, 0);
1859 return;
1860 }
1861
1862 set_page_private_data(cpage, ino);
1863
1864 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1865 goto out;
1866
1867 memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
1868 SetPageUptodate(cpage);
1869out:
1870 f2fs_put_page(cpage, 1);
1871}
1872
1873bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1874 block_t blkaddr)
1875{
1876 struct page *cpage;
1877 bool hitted = false;
1878
1879 if (!test_opt(sbi, COMPRESS_CACHE))
1880 return false;
1881
1882 cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
1883 blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1884 if (cpage) {
1885 if (PageUptodate(cpage)) {
1886 atomic_inc(&sbi->compress_page_hit);
1887 memcpy(page_address(page),
1888 page_address(cpage), PAGE_SIZE);
1889 hitted = true;
1890 }
1891 f2fs_put_page(cpage, 1);
1892 }
1893
1894 return hitted;
1895}
1896
1897void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1898{
1899 struct address_space *mapping = COMPRESS_MAPPING(sbi);
1900 struct folio_batch fbatch;
1901 pgoff_t index = 0;
1902 pgoff_t end = MAX_BLKADDR(sbi);
1903
1904 if (!mapping->nrpages)
1905 return;
1906
1907 folio_batch_init(&fbatch);
1908
1909 do {
1910 unsigned int nr, i;
1911
1912 nr = filemap_get_folios(mapping, &index, end - 1, &fbatch);
1913 if (!nr)
1914 break;
1915
1916 for (i = 0; i < nr; i++) {
1917 struct folio *folio = fbatch.folios[i];
1918
1919 folio_lock(folio);
1920 if (folio->mapping != mapping) {
1921 folio_unlock(folio);
1922 continue;
1923 }
1924
1925 if (ino != get_page_private_data(&folio->page)) {
1926 folio_unlock(folio);
1927 continue;
1928 }
1929
1930 generic_error_remove_page(mapping, &folio->page);
1931 folio_unlock(folio);
1932 }
1933 folio_batch_release(&fbatch);
1934 cond_resched();
1935 } while (index < end);
1936}
1937
1938int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
1939{
1940 struct inode *inode;
1941
1942 if (!test_opt(sbi, COMPRESS_CACHE))
1943 return 0;
1944
1945 inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
1946 if (IS_ERR(inode))
1947 return PTR_ERR(inode);
1948 sbi->compress_inode = inode;
1949
1950 sbi->compress_percent = COMPRESS_PERCENT;
1951 sbi->compress_watermark = COMPRESS_WATERMARK;
1952
1953 atomic_set(&sbi->compress_page_hit, 0);
1954
1955 return 0;
1956}
1957
1958void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
1959{
1960 if (!sbi->compress_inode)
1961 return;
1962 iput(sbi->compress_inode);
1963 sbi->compress_inode = NULL;
1964}
1965
1966int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1967{
1968 dev_t dev = sbi->sb->s_bdev->bd_dev;
1969 char slab_name[32];
1970
1971 if (!f2fs_sb_has_compression(sbi))
1972 return 0;
1973
1974 sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1975
1976 sbi->page_array_slab_size = sizeof(struct page *) <<
1977 F2FS_OPTION(sbi).compress_log_size;
1978
1979 sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1980 sbi->page_array_slab_size);
1981 return sbi->page_array_slab ? 0 : -ENOMEM;
1982}
1983
1984void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1985{
1986 kmem_cache_destroy(sbi->page_array_slab);
1987}
1988
1989int __init f2fs_init_compress_cache(void)
1990{
1991 cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1992 sizeof(struct compress_io_ctx));
1993 if (!cic_entry_slab)
1994 return -ENOMEM;
1995 dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1996 sizeof(struct decompress_io_ctx));
1997 if (!dic_entry_slab)
1998 goto free_cic;
1999 return 0;
2000free_cic:
2001 kmem_cache_destroy(cic_entry_slab);
2002 return -ENOMEM;
2003}
2004
2005void f2fs_destroy_compress_cache(void)
2006{
2007 kmem_cache_destroy(dic_entry_slab);
2008 kmem_cache_destroy(cic_entry_slab);
2009}