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(cachep: sbi->page_array_slab,
33 GFP_F2FS_ZERO, nofail: false, sbi: 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(s: sbi->page_array_slab, objp: pages);
47 else
48 kfree(objp: 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 bool (*is_level_valid)(int level);
59};
60
61static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
62{
63 return index & (cc->cluster_size - 1);
64}
65
66static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
67{
68 return index >> cc->log_cluster_size;
69}
70
71static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
72{
73 return cc->cluster_idx << cc->log_cluster_size;
74}
75
76bool f2fs_is_compressed_page(struct page *page)
77{
78 if (!PagePrivate(page))
79 return false;
80 if (!page_private(page))
81 return false;
82 if (page_private_nonpointer(page))
83 return false;
84
85 f2fs_bug_on(F2FS_M_SB(page->mapping),
86 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
87 return true;
88}
89
90static void f2fs_set_compressed_page(struct page *page,
91 struct inode *inode, pgoff_t index, void *data)
92{
93 attach_page_private(page, data: (void *)data);
94
95 /* i_crypto_info and iv index */
96 page->index = index;
97 page->mapping = inode->i_mapping;
98}
99
100static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
101{
102 int i;
103
104 for (i = 0; i < len; i++) {
105 if (!cc->rpages[i])
106 continue;
107 if (unlock)
108 unlock_page(page: cc->rpages[i]);
109 else
110 put_page(page: cc->rpages[i]);
111 }
112}
113
114static void f2fs_put_rpages(struct compress_ctx *cc)
115{
116 f2fs_drop_rpages(cc, len: cc->cluster_size, unlock: false);
117}
118
119static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
120{
121 f2fs_drop_rpages(cc, len, unlock: true);
122}
123
124static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
125 struct writeback_control *wbc, bool redirty, int unlock)
126{
127 unsigned int i;
128
129 for (i = 0; i < cc->cluster_size; i++) {
130 if (!cc->rpages[i])
131 continue;
132 if (redirty)
133 redirty_page_for_writepage(wbc, cc->rpages[i]);
134 f2fs_put_page(page: cc->rpages[i], unlock);
135 }
136}
137
138struct page *f2fs_compress_control_page(struct page *page)
139{
140 return ((struct compress_io_ctx *)page_private(page))->rpages[0];
141}
142
143int f2fs_init_compress_ctx(struct compress_ctx *cc)
144{
145 if (cc->rpages)
146 return 0;
147
148 cc->rpages = page_array_alloc(inode: cc->inode, nr: cc->cluster_size);
149 return cc->rpages ? 0 : -ENOMEM;
150}
151
152void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
153{
154 page_array_free(inode: cc->inode, pages: cc->rpages, nr: cc->cluster_size);
155 cc->rpages = NULL;
156 cc->nr_rpages = 0;
157 cc->nr_cpages = 0;
158 cc->valid_nr_cpages = 0;
159 if (!reuse)
160 cc->cluster_idx = NULL_CLUSTER;
161}
162
163void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
164{
165 unsigned int cluster_ofs;
166
167 if (!f2fs_cluster_can_merge_page(cc, index: page->index))
168 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
169
170 cluster_ofs = offset_in_cluster(cc, index: page->index);
171 cc->rpages[cluster_ofs] = page;
172 cc->nr_rpages++;
173 cc->cluster_idx = cluster_idx(cc, index: page->index);
174}
175
176#ifdef CONFIG_F2FS_FS_LZO
177static int lzo_init_compress_ctx(struct compress_ctx *cc)
178{
179 cc->private = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: cc->inode),
180 LZO1X_MEM_COMPRESS, GFP_NOFS);
181 if (!cc->private)
182 return -ENOMEM;
183
184 cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
185 return 0;
186}
187
188static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
189{
190 kvfree(addr: cc->private);
191 cc->private = NULL;
192}
193
194static int lzo_compress_pages(struct compress_ctx *cc)
195{
196 int ret;
197
198 ret = lzo1x_1_compress(src: cc->rbuf, src_len: cc->rlen, dst: cc->cbuf->cdata,
199 dst_len: &cc->clen, wrkmem: cc->private);
200 if (ret != LZO_E_OK) {
201 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
202 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
203 return -EIO;
204 }
205 return 0;
206}
207
208static int lzo_decompress_pages(struct decompress_io_ctx *dic)
209{
210 int ret;
211
212 ret = lzo1x_decompress_safe(src: dic->cbuf->cdata, src_len: dic->clen,
213 dst: dic->rbuf, dst_len: &dic->rlen);
214 if (ret != LZO_E_OK) {
215 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
216 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
217 return -EIO;
218 }
219
220 if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
221 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
222 "expected:%lu\n", KERN_ERR,
223 F2FS_I_SB(dic->inode)->sb->s_id,
224 dic->rlen,
225 PAGE_SIZE << dic->log_cluster_size);
226 return -EIO;
227 }
228 return 0;
229}
230
231static const struct f2fs_compress_ops f2fs_lzo_ops = {
232 .init_compress_ctx = lzo_init_compress_ctx,
233 .destroy_compress_ctx = lzo_destroy_compress_ctx,
234 .compress_pages = lzo_compress_pages,
235 .decompress_pages = lzo_decompress_pages,
236};
237#endif
238
239#ifdef CONFIG_F2FS_FS_LZ4
240static int lz4_init_compress_ctx(struct compress_ctx *cc)
241{
242 unsigned int size = LZ4_MEM_COMPRESS;
243
244#ifdef CONFIG_F2FS_FS_LZ4HC
245 if (F2FS_I(inode: cc->inode)->i_compress_level)
246 size = LZ4HC_MEM_COMPRESS;
247#endif
248
249 cc->private = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: cc->inode), size, GFP_NOFS);
250 if (!cc->private)
251 return -ENOMEM;
252
253 /*
254 * we do not change cc->clen to LZ4_compressBound(inputsize) to
255 * adapt worst compress case, because lz4 compressor can handle
256 * output budget properly.
257 */
258 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
259 return 0;
260}
261
262static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
263{
264 kvfree(addr: cc->private);
265 cc->private = NULL;
266}
267
268static int lz4_compress_pages(struct compress_ctx *cc)
269{
270 int len = -EINVAL;
271 unsigned char level = F2FS_I(inode: cc->inode)->i_compress_level;
272
273 if (!level)
274 len = LZ4_compress_default(source: cc->rbuf, dest: cc->cbuf->cdata, inputSize: cc->rlen,
275 maxOutputSize: cc->clen, wrkmem: cc->private);
276#ifdef CONFIG_F2FS_FS_LZ4HC
277 else
278 len = LZ4_compress_HC(src: cc->rbuf, dst: cc->cbuf->cdata, srcSize: cc->rlen,
279 dstCapacity: cc->clen, compressionLevel: level, wrkmem: cc->private);
280#endif
281 if (len < 0)
282 return len;
283 if (!len)
284 return -EAGAIN;
285
286 cc->clen = len;
287 return 0;
288}
289
290static int lz4_decompress_pages(struct decompress_io_ctx *dic)
291{
292 int ret;
293
294 ret = LZ4_decompress_safe(source: dic->cbuf->cdata, dest: dic->rbuf,
295 compressedSize: dic->clen, maxDecompressedSize: dic->rlen);
296 if (ret < 0) {
297 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
298 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
299 return -EIO;
300 }
301
302 if (ret != PAGE_SIZE << dic->log_cluster_size) {
303 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
304 "expected:%lu\n", KERN_ERR,
305 F2FS_I_SB(dic->inode)->sb->s_id, ret,
306 PAGE_SIZE << dic->log_cluster_size);
307 return -EIO;
308 }
309 return 0;
310}
311
312static bool lz4_is_level_valid(int lvl)
313{
314#ifdef CONFIG_F2FS_FS_LZ4HC
315 return !lvl || (lvl >= LZ4HC_MIN_CLEVEL && lvl <= LZ4HC_MAX_CLEVEL);
316#else
317 return lvl == 0;
318#endif
319}
320
321static const struct f2fs_compress_ops f2fs_lz4_ops = {
322 .init_compress_ctx = lz4_init_compress_ctx,
323 .destroy_compress_ctx = lz4_destroy_compress_ctx,
324 .compress_pages = lz4_compress_pages,
325 .decompress_pages = lz4_decompress_pages,
326 .is_level_valid = lz4_is_level_valid,
327};
328#endif
329
330#ifdef CONFIG_F2FS_FS_ZSTD
331static int zstd_init_compress_ctx(struct compress_ctx *cc)
332{
333 zstd_parameters params;
334 zstd_cstream *stream;
335 void *workspace;
336 unsigned int workspace_size;
337 unsigned char level = F2FS_I(inode: cc->inode)->i_compress_level;
338
339 /* Need to remain this for backward compatibility */
340 if (!level)
341 level = F2FS_ZSTD_DEFAULT_CLEVEL;
342
343 params = zstd_get_params(level, estimated_src_size: cc->rlen);
344 workspace_size = zstd_cstream_workspace_bound(cparams: &params.cParams);
345
346 workspace = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: cc->inode),
347 size: workspace_size, GFP_NOFS);
348 if (!workspace)
349 return -ENOMEM;
350
351 stream = zstd_init_cstream(parameters: &params, pledged_src_size: 0, workspace, workspace_size);
352 if (!stream) {
353 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n",
354 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
355 __func__);
356 kvfree(addr: workspace);
357 return -EIO;
358 }
359
360 cc->private = workspace;
361 cc->private2 = stream;
362
363 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
364 return 0;
365}
366
367static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
368{
369 kvfree(addr: cc->private);
370 cc->private = NULL;
371 cc->private2 = NULL;
372}
373
374static int zstd_compress_pages(struct compress_ctx *cc)
375{
376 zstd_cstream *stream = cc->private2;
377 zstd_in_buffer inbuf;
378 zstd_out_buffer outbuf;
379 int src_size = cc->rlen;
380 int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
381 int ret;
382
383 inbuf.pos = 0;
384 inbuf.src = cc->rbuf;
385 inbuf.size = src_size;
386
387 outbuf.pos = 0;
388 outbuf.dst = cc->cbuf->cdata;
389 outbuf.size = dst_size;
390
391 ret = zstd_compress_stream(cstream: stream, output: &outbuf, input: &inbuf);
392 if (zstd_is_error(code: ret)) {
393 printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n",
394 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
395 __func__, zstd_get_error_code(ret));
396 return -EIO;
397 }
398
399 ret = zstd_end_stream(cstream: stream, output: &outbuf);
400 if (zstd_is_error(code: ret)) {
401 printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n",
402 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
403 __func__, zstd_get_error_code(ret));
404 return -EIO;
405 }
406
407 /*
408 * there is compressed data remained in intermediate buffer due to
409 * no more space in cbuf.cdata
410 */
411 if (ret)
412 return -EAGAIN;
413
414 cc->clen = outbuf.pos;
415 return 0;
416}
417
418static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
419{
420 zstd_dstream *stream;
421 void *workspace;
422 unsigned int workspace_size;
423 unsigned int max_window_size =
424 MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
425
426 workspace_size = zstd_dstream_workspace_bound(max_window_size);
427
428 workspace = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: dic->inode),
429 size: workspace_size, GFP_NOFS);
430 if (!workspace)
431 return -ENOMEM;
432
433 stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
434 if (!stream) {
435 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n",
436 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
437 __func__);
438 kvfree(addr: workspace);
439 return -EIO;
440 }
441
442 dic->private = workspace;
443 dic->private2 = stream;
444
445 return 0;
446}
447
448static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
449{
450 kvfree(addr: dic->private);
451 dic->private = NULL;
452 dic->private2 = NULL;
453}
454
455static int zstd_decompress_pages(struct decompress_io_ctx *dic)
456{
457 zstd_dstream *stream = dic->private2;
458 zstd_in_buffer inbuf;
459 zstd_out_buffer outbuf;
460 int ret;
461
462 inbuf.pos = 0;
463 inbuf.src = dic->cbuf->cdata;
464 inbuf.size = dic->clen;
465
466 outbuf.pos = 0;
467 outbuf.dst = dic->rbuf;
468 outbuf.size = dic->rlen;
469
470 ret = zstd_decompress_stream(dstream: stream, output: &outbuf, input: &inbuf);
471 if (zstd_is_error(code: ret)) {
472 printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n",
473 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
474 __func__, zstd_get_error_code(ret));
475 return -EIO;
476 }
477
478 if (dic->rlen != outbuf.pos) {
479 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
480 "expected:%lu\n", KERN_ERR,
481 F2FS_I_SB(dic->inode)->sb->s_id,
482 __func__, dic->rlen,
483 PAGE_SIZE << dic->log_cluster_size);
484 return -EIO;
485 }
486
487 return 0;
488}
489
490static bool zstd_is_level_valid(int lvl)
491{
492 return lvl >= zstd_min_clevel() && lvl <= zstd_max_clevel();
493}
494
495static const struct f2fs_compress_ops f2fs_zstd_ops = {
496 .init_compress_ctx = zstd_init_compress_ctx,
497 .destroy_compress_ctx = zstd_destroy_compress_ctx,
498 .compress_pages = zstd_compress_pages,
499 .init_decompress_ctx = zstd_init_decompress_ctx,
500 .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
501 .decompress_pages = zstd_decompress_pages,
502 .is_level_valid = zstd_is_level_valid,
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(src: cc->rbuf, src_len: cc->rlen, dst: cc->cbuf->cdata,
513 dst_len: &cc->clen, wrkmem: cc->private);
514 if (ret != LZO_E_OK) {
515 f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
516 "lzo-rle compress failed, ret:%d", 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
561bool f2fs_is_compress_level_valid(int alg, int lvl)
562{
563 const struct f2fs_compress_ops *cops = f2fs_cops[alg];
564
565 if (cops->is_level_valid)
566 return cops->is_level_valid(lvl);
567
568 return lvl == 0;
569}
570
571static mempool_t *compress_page_pool;
572static int num_compress_pages = 512;
573module_param(num_compress_pages, uint, 0444);
574MODULE_PARM_DESC(num_compress_pages,
575 "Number of intermediate compress pages to preallocate");
576
577int __init f2fs_init_compress_mempool(void)
578{
579 compress_page_pool = mempool_create_page_pool(min_nr: num_compress_pages, order: 0);
580 return compress_page_pool ? 0 : -ENOMEM;
581}
582
583void f2fs_destroy_compress_mempool(void)
584{
585 mempool_destroy(pool: compress_page_pool);
586}
587
588static struct page *f2fs_compress_alloc_page(void)
589{
590 struct page *page;
591
592 page = mempool_alloc(pool: compress_page_pool, GFP_NOFS);
593 lock_page(page);
594
595 return page;
596}
597
598static void f2fs_compress_free_page(struct page *page)
599{
600 if (!page)
601 return;
602 detach_page_private(page);
603 page->mapping = NULL;
604 unlock_page(page);
605 mempool_free(element: page, pool: compress_page_pool);
606}
607
608#define MAX_VMAP_RETRIES 3
609
610static void *f2fs_vmap(struct page **pages, unsigned int count)
611{
612 int i;
613 void *buf = NULL;
614
615 for (i = 0; i < MAX_VMAP_RETRIES; i++) {
616 buf = vm_map_ram(pages, count, node: -1);
617 if (buf)
618 break;
619 vm_unmap_aliases();
620 }
621 return buf;
622}
623
624static int f2fs_compress_pages(struct compress_ctx *cc)
625{
626 struct f2fs_inode_info *fi = F2FS_I(inode: cc->inode);
627 const struct f2fs_compress_ops *cops =
628 f2fs_cops[fi->i_compress_algorithm];
629 unsigned int max_len, new_nr_cpages;
630 u32 chksum = 0;
631 int i, ret;
632
633 trace_f2fs_compress_pages_start(inode: cc->inode, cluster_idx: cc->cluster_idx,
634 cluster_size: cc->cluster_size, algtype: fi->i_compress_algorithm);
635
636 if (cops->init_compress_ctx) {
637 ret = cops->init_compress_ctx(cc);
638 if (ret)
639 goto out;
640 }
641
642 max_len = COMPRESS_HEADER_SIZE + cc->clen;
643 cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
644 cc->valid_nr_cpages = cc->nr_cpages;
645
646 cc->cpages = page_array_alloc(inode: cc->inode, nr: cc->nr_cpages);
647 if (!cc->cpages) {
648 ret = -ENOMEM;
649 goto destroy_compress_ctx;
650 }
651
652 for (i = 0; i < cc->nr_cpages; i++)
653 cc->cpages[i] = f2fs_compress_alloc_page();
654
655 cc->rbuf = f2fs_vmap(pages: cc->rpages, count: cc->cluster_size);
656 if (!cc->rbuf) {
657 ret = -ENOMEM;
658 goto out_free_cpages;
659 }
660
661 cc->cbuf = f2fs_vmap(pages: cc->cpages, count: cc->nr_cpages);
662 if (!cc->cbuf) {
663 ret = -ENOMEM;
664 goto out_vunmap_rbuf;
665 }
666
667 ret = cops->compress_pages(cc);
668 if (ret)
669 goto out_vunmap_cbuf;
670
671 max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
672
673 if (cc->clen > max_len) {
674 ret = -EAGAIN;
675 goto out_vunmap_cbuf;
676 }
677
678 cc->cbuf->clen = cpu_to_le32(cc->clen);
679
680 if (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))
681 chksum = f2fs_crc32(sbi: F2FS_I_SB(inode: cc->inode),
682 address: cc->cbuf->cdata, length: cc->clen);
683 cc->cbuf->chksum = cpu_to_le32(chksum);
684
685 for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
686 cc->cbuf->reserved[i] = cpu_to_le32(0);
687
688 new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
689
690 /* zero out any unused part of the last page */
691 memset(&cc->cbuf->cdata[cc->clen], 0,
692 (new_nr_cpages * PAGE_SIZE) -
693 (cc->clen + COMPRESS_HEADER_SIZE));
694
695 vm_unmap_ram(mem: cc->cbuf, count: cc->nr_cpages);
696 vm_unmap_ram(mem: cc->rbuf, count: cc->cluster_size);
697
698 for (i = new_nr_cpages; i < cc->nr_cpages; i++) {
699 f2fs_compress_free_page(page: cc->cpages[i]);
700 cc->cpages[i] = NULL;
701 }
702
703 if (cops->destroy_compress_ctx)
704 cops->destroy_compress_ctx(cc);
705
706 cc->valid_nr_cpages = new_nr_cpages;
707
708 trace_f2fs_compress_pages_end(inode: cc->inode, cluster_idx: cc->cluster_idx,
709 compressed_size: cc->clen, ret);
710 return 0;
711
712out_vunmap_cbuf:
713 vm_unmap_ram(mem: cc->cbuf, count: cc->nr_cpages);
714out_vunmap_rbuf:
715 vm_unmap_ram(mem: cc->rbuf, count: cc->cluster_size);
716out_free_cpages:
717 for (i = 0; i < cc->nr_cpages; i++) {
718 if (cc->cpages[i])
719 f2fs_compress_free_page(page: cc->cpages[i]);
720 }
721 page_array_free(inode: cc->inode, pages: cc->cpages, nr: cc->nr_cpages);
722 cc->cpages = NULL;
723destroy_compress_ctx:
724 if (cops->destroy_compress_ctx)
725 cops->destroy_compress_ctx(cc);
726out:
727 trace_f2fs_compress_pages_end(inode: cc->inode, cluster_idx: cc->cluster_idx,
728 compressed_size: cc->clen, ret);
729 return ret;
730}
731
732static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
733 bool pre_alloc);
734static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
735 bool bypass_destroy_callback, bool pre_alloc);
736
737void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
738{
739 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dic->inode);
740 struct f2fs_inode_info *fi = F2FS_I(inode: dic->inode);
741 const struct f2fs_compress_ops *cops =
742 f2fs_cops[fi->i_compress_algorithm];
743 bool bypass_callback = false;
744 int ret;
745
746 trace_f2fs_decompress_pages_start(inode: dic->inode, cluster_idx: dic->cluster_idx,
747 cluster_size: dic->cluster_size, algtype: fi->i_compress_algorithm);
748
749 if (dic->failed) {
750 ret = -EIO;
751 goto out_end_io;
752 }
753
754 ret = f2fs_prepare_decomp_mem(dic, pre_alloc: false);
755 if (ret) {
756 bypass_callback = true;
757 goto out_release;
758 }
759
760 dic->clen = le32_to_cpu(dic->cbuf->clen);
761 dic->rlen = PAGE_SIZE << dic->log_cluster_size;
762
763 if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
764 ret = -EFSCORRUPTED;
765
766 /* Avoid f2fs_commit_super in irq context */
767 if (!in_task)
768 f2fs_handle_error_async(sbi, error: ERROR_FAIL_DECOMPRESSION);
769 else
770 f2fs_handle_error(sbi, error: ERROR_FAIL_DECOMPRESSION);
771 goto out_release;
772 }
773
774 ret = cops->decompress_pages(dic);
775
776 if (!ret && (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))) {
777 u32 provided = le32_to_cpu(dic->cbuf->chksum);
778 u32 calculated = f2fs_crc32(sbi, address: dic->cbuf->cdata, length: dic->clen);
779
780 if (provided != calculated) {
781 if (!is_inode_flag_set(inode: dic->inode, flag: FI_COMPRESS_CORRUPT)) {
782 set_inode_flag(inode: dic->inode, flag: FI_COMPRESS_CORRUPT);
783 f2fs_info_ratelimited(sbi,
784 "checksum invalid, nid = %lu, %x vs %x",
785 dic->inode->i_ino,
786 provided, calculated);
787 }
788 set_sbi_flag(sbi, type: SBI_NEED_FSCK);
789 }
790 }
791
792out_release:
793 f2fs_release_decomp_mem(dic, bypass_destroy_callback: bypass_callback, pre_alloc: false);
794
795out_end_io:
796 trace_f2fs_decompress_pages_end(inode: dic->inode, cluster_idx: dic->cluster_idx,
797 compressed_size: dic->clen, ret);
798 f2fs_decompress_end_io(dic, failed: ret, in_task);
799}
800
801/*
802 * This is called when a page of a compressed cluster has been read from disk
803 * (or failed to be read from disk). It checks whether this page was the last
804 * page being waited on in the cluster, and if so, it decompresses the cluster
805 * (or in the case of a failure, cleans up without actually decompressing).
806 */
807void f2fs_end_read_compressed_page(struct page *page, bool failed,
808 block_t blkaddr, bool in_task)
809{
810 struct decompress_io_ctx *dic =
811 (struct decompress_io_ctx *)page_private(page);
812 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dic->inode);
813
814 dec_page_count(sbi, count_type: F2FS_RD_DATA);
815
816 if (failed)
817 WRITE_ONCE(dic->failed, true);
818 else if (blkaddr && in_task)
819 f2fs_cache_compressed_page(sbi, page,
820 ino: dic->inode->i_ino, blkaddr);
821
822 if (atomic_dec_and_test(v: &dic->remaining_pages))
823 f2fs_decompress_cluster(dic, in_task);
824}
825
826static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
827{
828 if (cc->cluster_idx == NULL_CLUSTER)
829 return true;
830 return cc->cluster_idx == cluster_idx(cc, index);
831}
832
833bool f2fs_cluster_is_empty(struct compress_ctx *cc)
834{
835 return cc->nr_rpages == 0;
836}
837
838static bool f2fs_cluster_is_full(struct compress_ctx *cc)
839{
840 return cc->cluster_size == cc->nr_rpages;
841}
842
843bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
844{
845 if (f2fs_cluster_is_empty(cc))
846 return true;
847 return is_page_in_cluster(cc, index);
848}
849
850bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
851 int index, int nr_pages, bool uptodate)
852{
853 unsigned long pgidx = pages[index]->index;
854 int i = uptodate ? 0 : 1;
855
856 /*
857 * when uptodate set to true, try to check all pages in cluster is
858 * uptodate or not.
859 */
860 if (uptodate && (pgidx % cc->cluster_size))
861 return false;
862
863 if (nr_pages - index < cc->cluster_size)
864 return false;
865
866 for (; i < cc->cluster_size; i++) {
867 if (pages[index + i]->index != pgidx + i)
868 return false;
869 if (uptodate && !PageUptodate(page: pages[index + i]))
870 return false;
871 }
872
873 return true;
874}
875
876static bool cluster_has_invalid_data(struct compress_ctx *cc)
877{
878 loff_t i_size = i_size_read(inode: cc->inode);
879 unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
880 int i;
881
882 for (i = 0; i < cc->cluster_size; i++) {
883 struct page *page = cc->rpages[i];
884
885 f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
886
887 /* beyond EOF */
888 if (page->index >= nr_pages)
889 return true;
890 }
891 return false;
892}
893
894bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
895{
896#ifdef CONFIG_F2FS_CHECK_FS
897 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dn->inode);
898 unsigned int cluster_size = F2FS_I(inode: dn->inode)->i_cluster_size;
899 int cluster_end = 0;
900 unsigned int count;
901 int i;
902 char *reason = "";
903
904 if (dn->data_blkaddr != COMPRESS_ADDR)
905 return false;
906
907 /* [..., COMPR_ADDR, ...] */
908 if (dn->ofs_in_node % cluster_size) {
909 reason = "[*|C|*|*]";
910 goto out;
911 }
912
913 for (i = 1, count = 1; i < cluster_size; i++, count++) {
914 block_t blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page,
915 offset: dn->ofs_in_node + i);
916
917 /* [COMPR_ADDR, ..., COMPR_ADDR] */
918 if (blkaddr == COMPRESS_ADDR) {
919 reason = "[C|*|C|*]";
920 goto out;
921 }
922 if (!__is_valid_data_blkaddr(blkaddr)) {
923 if (!cluster_end)
924 cluster_end = i;
925 continue;
926 }
927 /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
928 if (cluster_end) {
929 reason = "[C|N|N|V]";
930 goto out;
931 }
932 }
933
934 f2fs_bug_on(F2FS_I_SB(dn->inode), count != cluster_size &&
935 !is_inode_flag_set(dn->inode, FI_COMPRESS_RELEASED));
936
937 return false;
938out:
939 f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
940 dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
941 set_sbi_flag(sbi, type: SBI_NEED_FSCK);
942 return true;
943#else
944 return false;
945#endif
946}
947
948static int __f2fs_get_cluster_blocks(struct inode *inode,
949 struct dnode_of_data *dn)
950{
951 unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
952 int count, i;
953
954 for (i = 1, count = 1; i < cluster_size; i++) {
955 block_t blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page,
956 offset: dn->ofs_in_node + i);
957
958 if (__is_valid_data_blkaddr(blkaddr))
959 count++;
960 }
961
962 return count;
963}
964
965static int __f2fs_cluster_blocks(struct inode *inode,
966 unsigned int cluster_idx, bool compr_blks)
967{
968 struct dnode_of_data dn;
969 unsigned int start_idx = cluster_idx <<
970 F2FS_I(inode)->i_log_cluster_size;
971 int ret;
972
973 set_new_dnode(dn: &dn, inode, NULL, NULL, nid: 0);
974 ret = f2fs_get_dnode_of_data(dn: &dn, index: start_idx, mode: LOOKUP_NODE);
975 if (ret) {
976 if (ret == -ENOENT)
977 ret = 0;
978 goto fail;
979 }
980
981 if (f2fs_sanity_check_cluster(dn: &dn)) {
982 ret = -EFSCORRUPTED;
983 goto fail;
984 }
985
986 if (dn.data_blkaddr == COMPRESS_ADDR) {
987 if (compr_blks)
988 ret = __f2fs_get_cluster_blocks(inode, dn: &dn);
989 else
990 ret = 1;
991 }
992fail:
993 f2fs_put_dnode(dn: &dn);
994 return ret;
995}
996
997/* return # of compressed blocks in compressed cluster */
998static int f2fs_compressed_blocks(struct compress_ctx *cc)
999{
1000 return __f2fs_cluster_blocks(inode: cc->inode, cluster_idx: cc->cluster_idx, compr_blks: true);
1001}
1002
1003/* return whether cluster is compressed one or not */
1004int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
1005{
1006 return __f2fs_cluster_blocks(inode,
1007 cluster_idx: index >> F2FS_I(inode)->i_log_cluster_size,
1008 compr_blks: false);
1009}
1010
1011static bool cluster_may_compress(struct compress_ctx *cc)
1012{
1013 if (!f2fs_need_compress_data(inode: cc->inode))
1014 return false;
1015 if (f2fs_is_atomic_file(inode: cc->inode))
1016 return false;
1017 if (!f2fs_cluster_is_full(cc))
1018 return false;
1019 if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
1020 return false;
1021 return !cluster_has_invalid_data(cc);
1022}
1023
1024static void set_cluster_writeback(struct compress_ctx *cc)
1025{
1026 int i;
1027
1028 for (i = 0; i < cc->cluster_size; i++) {
1029 if (cc->rpages[i])
1030 set_page_writeback(cc->rpages[i]);
1031 }
1032}
1033
1034static void set_cluster_dirty(struct compress_ctx *cc)
1035{
1036 int i;
1037
1038 for (i = 0; i < cc->cluster_size; i++)
1039 if (cc->rpages[i]) {
1040 set_page_dirty(cc->rpages[i]);
1041 set_page_private_gcing(cc->rpages[i]);
1042 }
1043}
1044
1045static int prepare_compress_overwrite(struct compress_ctx *cc,
1046 struct page **pagep, pgoff_t index, void **fsdata)
1047{
1048 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: cc->inode);
1049 struct address_space *mapping = cc->inode->i_mapping;
1050 struct page *page;
1051 sector_t last_block_in_bio;
1052 fgf_t fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1053 pgoff_t start_idx = start_idx_of_cluster(cc);
1054 int i, ret;
1055
1056retry:
1057 ret = f2fs_is_compressed_cluster(inode: cc->inode, index: start_idx);
1058 if (ret <= 0)
1059 return ret;
1060
1061 ret = f2fs_init_compress_ctx(cc);
1062 if (ret)
1063 return ret;
1064
1065 /* keep page reference to avoid page reclaim */
1066 for (i = 0; i < cc->cluster_size; i++) {
1067 page = f2fs_pagecache_get_page(mapping, index: start_idx + i,
1068 fgp_flags: fgp_flag, GFP_NOFS);
1069 if (!page) {
1070 ret = -ENOMEM;
1071 goto unlock_pages;
1072 }
1073
1074 if (PageUptodate(page))
1075 f2fs_put_page(page, unlock: 1);
1076 else
1077 f2fs_compress_ctx_add_page(cc, page);
1078 }
1079
1080 if (!f2fs_cluster_is_empty(cc)) {
1081 struct bio *bio = NULL;
1082
1083 ret = f2fs_read_multi_pages(cc, bio_ret: &bio, nr_pages: cc->cluster_size,
1084 last_block_in_bio: &last_block_in_bio, is_readahead: false, for_write: true);
1085 f2fs_put_rpages(cc);
1086 f2fs_destroy_compress_ctx(cc, reuse: true);
1087 if (ret)
1088 goto out;
1089 if (bio)
1090 f2fs_submit_read_bio(sbi, bio, type: DATA);
1091
1092 ret = f2fs_init_compress_ctx(cc);
1093 if (ret)
1094 goto out;
1095 }
1096
1097 for (i = 0; i < cc->cluster_size; i++) {
1098 f2fs_bug_on(sbi, cc->rpages[i]);
1099
1100 page = find_lock_page(mapping, index: start_idx + i);
1101 if (!page) {
1102 /* page can be truncated */
1103 goto release_and_retry;
1104 }
1105
1106 f2fs_wait_on_page_writeback(page, type: DATA, ordered: true, locked: true);
1107 f2fs_compress_ctx_add_page(cc, page);
1108
1109 if (!PageUptodate(page)) {
1110release_and_retry:
1111 f2fs_put_rpages(cc);
1112 f2fs_unlock_rpages(cc, len: i + 1);
1113 f2fs_destroy_compress_ctx(cc, reuse: true);
1114 goto retry;
1115 }
1116 }
1117
1118 if (likely(!ret)) {
1119 *fsdata = cc->rpages;
1120 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1121 return cc->cluster_size;
1122 }
1123
1124unlock_pages:
1125 f2fs_put_rpages(cc);
1126 f2fs_unlock_rpages(cc, len: i);
1127 f2fs_destroy_compress_ctx(cc, reuse: true);
1128out:
1129 return ret;
1130}
1131
1132int f2fs_prepare_compress_overwrite(struct inode *inode,
1133 struct page **pagep, pgoff_t index, void **fsdata)
1134{
1135 struct compress_ctx cc = {
1136 .inode = inode,
1137 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1138 .cluster_size = F2FS_I(inode)->i_cluster_size,
1139 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1140 .rpages = NULL,
1141 .nr_rpages = 0,
1142 };
1143
1144 return prepare_compress_overwrite(cc: &cc, pagep, index, fsdata);
1145}
1146
1147bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1148 pgoff_t index, unsigned copied)
1149
1150{
1151 struct compress_ctx cc = {
1152 .inode = inode,
1153 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1154 .cluster_size = F2FS_I(inode)->i_cluster_size,
1155 .rpages = fsdata,
1156 };
1157 bool first_index = (index == cc.rpages[0]->index);
1158
1159 if (copied)
1160 set_cluster_dirty(&cc);
1161
1162 f2fs_put_rpages_wbc(cc: &cc, NULL, redirty: false, unlock: 1);
1163 f2fs_destroy_compress_ctx(cc: &cc, reuse: false);
1164
1165 return first_index;
1166}
1167
1168int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1169{
1170 void *fsdata = NULL;
1171 struct page *pagep;
1172 int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1173 pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1174 log_cluster_size;
1175 int err;
1176
1177 err = f2fs_is_compressed_cluster(inode, index: start_idx);
1178 if (err < 0)
1179 return err;
1180
1181 /* truncate normal cluster */
1182 if (!err)
1183 return f2fs_do_truncate_blocks(inode, from, lock);
1184
1185 /* truncate compressed cluster */
1186 err = f2fs_prepare_compress_overwrite(inode, pagep: &pagep,
1187 index: start_idx, fsdata: &fsdata);
1188
1189 /* should not be a normal cluster */
1190 f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1191
1192 if (err <= 0)
1193 return err;
1194
1195 if (err > 0) {
1196 struct page **rpages = fsdata;
1197 int cluster_size = F2FS_I(inode)->i_cluster_size;
1198 int i;
1199
1200 for (i = cluster_size - 1; i >= 0; i--) {
1201 loff_t start = rpages[i]->index << PAGE_SHIFT;
1202
1203 if (from <= start) {
1204 zero_user_segment(page: rpages[i], start: 0, PAGE_SIZE);
1205 } else {
1206 zero_user_segment(page: rpages[i], start: from - start,
1207 PAGE_SIZE);
1208 break;
1209 }
1210 }
1211
1212 f2fs_compress_write_end(inode, fsdata, index: start_idx, copied: true);
1213 }
1214 return 0;
1215}
1216
1217static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1218 int *submitted,
1219 struct writeback_control *wbc,
1220 enum iostat_type io_type)
1221{
1222 struct inode *inode = cc->inode;
1223 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1224 struct f2fs_inode_info *fi = F2FS_I(inode);
1225 struct f2fs_io_info fio = {
1226 .sbi = sbi,
1227 .ino = cc->inode->i_ino,
1228 .type = DATA,
1229 .op = REQ_OP_WRITE,
1230 .op_flags = wbc_to_write_flags(wbc),
1231 .old_blkaddr = NEW_ADDR,
1232 .page = NULL,
1233 .encrypted_page = NULL,
1234 .compressed_page = NULL,
1235 .submitted = 0,
1236 .io_type = io_type,
1237 .io_wbc = wbc,
1238 .encrypted = fscrypt_inode_uses_fs_layer_crypto(inode: cc->inode) ?
1239 1 : 0,
1240 };
1241 struct dnode_of_data dn;
1242 struct node_info ni;
1243 struct compress_io_ctx *cic;
1244 pgoff_t start_idx = start_idx_of_cluster(cc);
1245 unsigned int last_index = cc->cluster_size - 1;
1246 loff_t psize;
1247 int i, err;
1248 bool quota_inode = IS_NOQUOTA(inode);
1249
1250 /* we should bypass data pages to proceed the kworker jobs */
1251 if (unlikely(f2fs_cp_error(sbi))) {
1252 mapping_set_error(mapping: cc->rpages[0]->mapping, error: -EIO);
1253 goto out_free;
1254 }
1255
1256 if (quota_inode) {
1257 /*
1258 * We need to wait for node_write to avoid block allocation during
1259 * checkpoint. This can only happen to quota writes which can cause
1260 * the below discard race condition.
1261 */
1262 f2fs_down_read(sem: &sbi->node_write);
1263 } else if (!f2fs_trylock_op(sbi)) {
1264 goto out_free;
1265 }
1266
1267 set_new_dnode(dn: &dn, inode: cc->inode, NULL, NULL, nid: 0);
1268
1269 err = f2fs_get_dnode_of_data(dn: &dn, index: start_idx, mode: LOOKUP_NODE);
1270 if (err)
1271 goto out_unlock_op;
1272
1273 for (i = 0; i < cc->cluster_size; i++) {
1274 if (data_blkaddr(inode: dn.inode, node_page: dn.node_page,
1275 offset: dn.ofs_in_node + i) == NULL_ADDR)
1276 goto out_put_dnode;
1277 }
1278
1279 psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1280
1281 err = f2fs_get_node_info(sbi: fio.sbi, nid: dn.nid, ni: &ni, checkpoint_context: false);
1282 if (err)
1283 goto out_put_dnode;
1284
1285 fio.version = ni.version;
1286
1287 cic = f2fs_kmem_cache_alloc(cachep: cic_entry_slab, GFP_F2FS_ZERO, nofail: false, sbi);
1288 if (!cic)
1289 goto out_put_dnode;
1290
1291 cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1292 cic->inode = inode;
1293 atomic_set(v: &cic->pending_pages, i: cc->valid_nr_cpages);
1294 cic->rpages = page_array_alloc(inode: cc->inode, nr: cc->cluster_size);
1295 if (!cic->rpages)
1296 goto out_put_cic;
1297
1298 cic->nr_rpages = cc->cluster_size;
1299
1300 for (i = 0; i < cc->valid_nr_cpages; i++) {
1301 f2fs_set_compressed_page(page: cc->cpages[i], inode,
1302 index: cc->rpages[i + 1]->index, data: cic);
1303 fio.compressed_page = cc->cpages[i];
1304
1305 fio.old_blkaddr = data_blkaddr(inode: dn.inode, node_page: dn.node_page,
1306 offset: dn.ofs_in_node + i + 1);
1307
1308 /* wait for GCed page writeback via META_MAPPING */
1309 f2fs_wait_on_block_writeback(inode, blkaddr: fio.old_blkaddr);
1310
1311 if (fio.encrypted) {
1312 fio.page = cc->rpages[i + 1];
1313 err = f2fs_encrypt_one_page(fio: &fio);
1314 if (err)
1315 goto out_destroy_crypt;
1316 cc->cpages[i] = fio.encrypted_page;
1317 }
1318 }
1319
1320 set_cluster_writeback(cc);
1321
1322 for (i = 0; i < cc->cluster_size; i++)
1323 cic->rpages[i] = cc->rpages[i];
1324
1325 for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1326 block_t blkaddr;
1327
1328 blkaddr = f2fs_data_blkaddr(dn: &dn);
1329 fio.page = cc->rpages[i];
1330 fio.old_blkaddr = blkaddr;
1331
1332 /* cluster header */
1333 if (i == 0) {
1334 if (blkaddr == COMPRESS_ADDR)
1335 fio.compr_blocks++;
1336 if (__is_valid_data_blkaddr(blkaddr))
1337 f2fs_invalidate_blocks(sbi, addr: blkaddr);
1338 f2fs_update_data_blkaddr(dn: &dn, COMPRESS_ADDR);
1339 goto unlock_continue;
1340 }
1341
1342 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1343 fio.compr_blocks++;
1344
1345 if (i > cc->valid_nr_cpages) {
1346 if (__is_valid_data_blkaddr(blkaddr)) {
1347 f2fs_invalidate_blocks(sbi, addr: blkaddr);
1348 f2fs_update_data_blkaddr(dn: &dn, NEW_ADDR);
1349 }
1350 goto unlock_continue;
1351 }
1352
1353 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1354
1355 if (fio.encrypted)
1356 fio.encrypted_page = cc->cpages[i - 1];
1357 else
1358 fio.compressed_page = cc->cpages[i - 1];
1359
1360 cc->cpages[i - 1] = NULL;
1361 f2fs_outplace_write_data(dn: &dn, fio: &fio);
1362 (*submitted)++;
1363unlock_continue:
1364 inode_dec_dirty_pages(inode: cc->inode);
1365 unlock_page(page: fio.page);
1366 }
1367
1368 if (fio.compr_blocks)
1369 f2fs_i_compr_blocks_update(inode, blocks: fio.compr_blocks - 1, add: false);
1370 f2fs_i_compr_blocks_update(inode, blocks: cc->valid_nr_cpages, add: true);
1371 add_compr_block_stat(inode, cc->valid_nr_cpages);
1372
1373 set_inode_flag(inode: cc->inode, flag: FI_APPEND_WRITE);
1374
1375 f2fs_put_dnode(dn: &dn);
1376 if (quota_inode)
1377 f2fs_up_read(sem: &sbi->node_write);
1378 else
1379 f2fs_unlock_op(sbi);
1380
1381 spin_lock(lock: &fi->i_size_lock);
1382 if (fi->last_disk_size < psize)
1383 fi->last_disk_size = psize;
1384 spin_unlock(lock: &fi->i_size_lock);
1385
1386 f2fs_put_rpages(cc);
1387 page_array_free(inode: cc->inode, pages: cc->cpages, nr: cc->nr_cpages);
1388 cc->cpages = NULL;
1389 f2fs_destroy_compress_ctx(cc, reuse: false);
1390 return 0;
1391
1392out_destroy_crypt:
1393 page_array_free(inode: cc->inode, pages: cic->rpages, nr: cc->cluster_size);
1394
1395 for (--i; i >= 0; i--)
1396 fscrypt_finalize_bounce_page(pagep: &cc->cpages[i]);
1397out_put_cic:
1398 kmem_cache_free(s: cic_entry_slab, objp: cic);
1399out_put_dnode:
1400 f2fs_put_dnode(dn: &dn);
1401out_unlock_op:
1402 if (quota_inode)
1403 f2fs_up_read(sem: &sbi->node_write);
1404 else
1405 f2fs_unlock_op(sbi);
1406out_free:
1407 for (i = 0; i < cc->valid_nr_cpages; i++) {
1408 f2fs_compress_free_page(page: cc->cpages[i]);
1409 cc->cpages[i] = NULL;
1410 }
1411 page_array_free(inode: cc->inode, pages: cc->cpages, nr: cc->nr_cpages);
1412 cc->cpages = NULL;
1413 return -EAGAIN;
1414}
1415
1416void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1417{
1418 struct f2fs_sb_info *sbi = bio->bi_private;
1419 struct compress_io_ctx *cic =
1420 (struct compress_io_ctx *)page_private(page);
1421 enum count_type type = WB_DATA_TYPE(page,
1422 f2fs_is_compressed_page(page));
1423 int i;
1424
1425 if (unlikely(bio->bi_status))
1426 mapping_set_error(mapping: cic->inode->i_mapping, error: -EIO);
1427
1428 f2fs_compress_free_page(page);
1429
1430 dec_page_count(sbi, count_type: type);
1431
1432 if (atomic_dec_return(v: &cic->pending_pages))
1433 return;
1434
1435 for (i = 0; i < cic->nr_rpages; i++) {
1436 WARN_ON(!cic->rpages[i]);
1437 clear_page_private_gcing(page: cic->rpages[i]);
1438 end_page_writeback(page: cic->rpages[i]);
1439 }
1440
1441 page_array_free(inode: cic->inode, pages: cic->rpages, nr: cic->nr_rpages);
1442 kmem_cache_free(s: cic_entry_slab, objp: cic);
1443}
1444
1445static int f2fs_write_raw_pages(struct compress_ctx *cc,
1446 int *submitted_p,
1447 struct writeback_control *wbc,
1448 enum iostat_type io_type)
1449{
1450 struct address_space *mapping = cc->inode->i_mapping;
1451 struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
1452 int submitted, compr_blocks, i;
1453 int ret = 0;
1454
1455 compr_blocks = f2fs_compressed_blocks(cc);
1456
1457 for (i = 0; i < cc->cluster_size; i++) {
1458 if (!cc->rpages[i])
1459 continue;
1460
1461 redirty_page_for_writepage(wbc, cc->rpages[i]);
1462 unlock_page(page: cc->rpages[i]);
1463 }
1464
1465 if (compr_blocks < 0)
1466 return compr_blocks;
1467
1468 /* overwrite compressed cluster w/ normal cluster */
1469 if (compr_blocks > 0)
1470 f2fs_lock_op(sbi);
1471
1472 for (i = 0; i < cc->cluster_size; i++) {
1473 if (!cc->rpages[i])
1474 continue;
1475retry_write:
1476 lock_page(page: cc->rpages[i]);
1477
1478 if (cc->rpages[i]->mapping != mapping) {
1479continue_unlock:
1480 unlock_page(page: cc->rpages[i]);
1481 continue;
1482 }
1483
1484 if (!PageDirty(page: cc->rpages[i]))
1485 goto continue_unlock;
1486
1487 if (PageWriteback(page: cc->rpages[i])) {
1488 if (wbc->sync_mode == WB_SYNC_NONE)
1489 goto continue_unlock;
1490 f2fs_wait_on_page_writeback(page: cc->rpages[i], type: DATA, ordered: true, locked: true);
1491 }
1492
1493 if (!clear_page_dirty_for_io(page: cc->rpages[i]))
1494 goto continue_unlock;
1495
1496 ret = f2fs_write_single_data_page(page: cc->rpages[i], submitted: &submitted,
1497 NULL, NULL, wbc, io_type,
1498 compr_blocks, allow_balance: false);
1499 if (ret) {
1500 if (ret == AOP_WRITEPAGE_ACTIVATE) {
1501 unlock_page(page: cc->rpages[i]);
1502 ret = 0;
1503 } else if (ret == -EAGAIN) {
1504 ret = 0;
1505 /*
1506 * for quota file, just redirty left pages to
1507 * avoid deadlock caused by cluster update race
1508 * from foreground operation.
1509 */
1510 if (IS_NOQUOTA(cc->inode))
1511 goto out;
1512 f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
1513 goto retry_write;
1514 }
1515 goto out;
1516 }
1517
1518 *submitted_p += submitted;
1519 }
1520
1521out:
1522 if (compr_blocks > 0)
1523 f2fs_unlock_op(sbi);
1524
1525 f2fs_balance_fs(sbi, need: true);
1526 return ret;
1527}
1528
1529int f2fs_write_multi_pages(struct compress_ctx *cc,
1530 int *submitted,
1531 struct writeback_control *wbc,
1532 enum iostat_type io_type)
1533{
1534 int err;
1535
1536 *submitted = 0;
1537 if (cluster_may_compress(cc)) {
1538 err = f2fs_compress_pages(cc);
1539 if (err == -EAGAIN) {
1540 add_compr_block_stat(cc->inode, cc->cluster_size);
1541 goto write;
1542 } else if (err) {
1543 f2fs_put_rpages_wbc(cc, wbc, redirty: true, unlock: 1);
1544 goto destroy_out;
1545 }
1546
1547 err = f2fs_write_compressed_pages(cc, submitted,
1548 wbc, io_type);
1549 if (!err)
1550 return 0;
1551 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1552 }
1553write:
1554 f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1555
1556 err = f2fs_write_raw_pages(cc, submitted_p: submitted, wbc, io_type);
1557 f2fs_put_rpages_wbc(cc, wbc, redirty: false, unlock: 0);
1558destroy_out:
1559 f2fs_destroy_compress_ctx(cc, reuse: false);
1560 return err;
1561}
1562
1563static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
1564 bool pre_alloc)
1565{
1566 return pre_alloc ^ f2fs_low_mem_mode(sbi);
1567}
1568
1569static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
1570 bool pre_alloc)
1571{
1572 const struct f2fs_compress_ops *cops =
1573 f2fs_cops[F2FS_I(inode: dic->inode)->i_compress_algorithm];
1574 int i;
1575
1576 if (!allow_memalloc_for_decomp(sbi: F2FS_I_SB(inode: dic->inode), pre_alloc))
1577 return 0;
1578
1579 dic->tpages = page_array_alloc(inode: dic->inode, nr: dic->cluster_size);
1580 if (!dic->tpages)
1581 return -ENOMEM;
1582
1583 for (i = 0; i < dic->cluster_size; i++) {
1584 if (dic->rpages[i]) {
1585 dic->tpages[i] = dic->rpages[i];
1586 continue;
1587 }
1588
1589 dic->tpages[i] = f2fs_compress_alloc_page();
1590 }
1591
1592 dic->rbuf = f2fs_vmap(pages: dic->tpages, count: dic->cluster_size);
1593 if (!dic->rbuf)
1594 return -ENOMEM;
1595
1596 dic->cbuf = f2fs_vmap(pages: dic->cpages, count: dic->nr_cpages);
1597 if (!dic->cbuf)
1598 return -ENOMEM;
1599
1600 if (cops->init_decompress_ctx)
1601 return cops->init_decompress_ctx(dic);
1602
1603 return 0;
1604}
1605
1606static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
1607 bool bypass_destroy_callback, bool pre_alloc)
1608{
1609 const struct f2fs_compress_ops *cops =
1610 f2fs_cops[F2FS_I(inode: dic->inode)->i_compress_algorithm];
1611
1612 if (!allow_memalloc_for_decomp(sbi: F2FS_I_SB(inode: dic->inode), pre_alloc))
1613 return;
1614
1615 if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
1616 cops->destroy_decompress_ctx(dic);
1617
1618 if (dic->cbuf)
1619 vm_unmap_ram(mem: dic->cbuf, count: dic->nr_cpages);
1620
1621 if (dic->rbuf)
1622 vm_unmap_ram(mem: dic->rbuf, count: dic->cluster_size);
1623}
1624
1625static void f2fs_free_dic(struct decompress_io_ctx *dic,
1626 bool bypass_destroy_callback);
1627
1628struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1629{
1630 struct decompress_io_ctx *dic;
1631 pgoff_t start_idx = start_idx_of_cluster(cc);
1632 struct f2fs_sb_info *sbi = F2FS_I_SB(inode: cc->inode);
1633 int i, ret;
1634
1635 dic = f2fs_kmem_cache_alloc(cachep: dic_entry_slab, GFP_F2FS_ZERO, nofail: false, sbi);
1636 if (!dic)
1637 return ERR_PTR(error: -ENOMEM);
1638
1639 dic->rpages = page_array_alloc(inode: cc->inode, nr: cc->cluster_size);
1640 if (!dic->rpages) {
1641 kmem_cache_free(s: dic_entry_slab, objp: dic);
1642 return ERR_PTR(error: -ENOMEM);
1643 }
1644
1645 dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1646 dic->inode = cc->inode;
1647 atomic_set(v: &dic->remaining_pages, i: cc->nr_cpages);
1648 dic->cluster_idx = cc->cluster_idx;
1649 dic->cluster_size = cc->cluster_size;
1650 dic->log_cluster_size = cc->log_cluster_size;
1651 dic->nr_cpages = cc->nr_cpages;
1652 refcount_set(r: &dic->refcnt, n: 1);
1653 dic->failed = false;
1654 dic->need_verity = f2fs_need_verity(inode: cc->inode, idx: start_idx);
1655
1656 for (i = 0; i < dic->cluster_size; i++)
1657 dic->rpages[i] = cc->rpages[i];
1658 dic->nr_rpages = cc->cluster_size;
1659
1660 dic->cpages = page_array_alloc(inode: dic->inode, nr: dic->nr_cpages);
1661 if (!dic->cpages) {
1662 ret = -ENOMEM;
1663 goto out_free;
1664 }
1665
1666 for (i = 0; i < dic->nr_cpages; i++) {
1667 struct page *page;
1668
1669 page = f2fs_compress_alloc_page();
1670 f2fs_set_compressed_page(page, inode: cc->inode,
1671 index: start_idx + i + 1, data: dic);
1672 dic->cpages[i] = page;
1673 }
1674
1675 ret = f2fs_prepare_decomp_mem(dic, pre_alloc: true);
1676 if (ret)
1677 goto out_free;
1678
1679 return dic;
1680
1681out_free:
1682 f2fs_free_dic(dic, bypass_destroy_callback: true);
1683 return ERR_PTR(error: ret);
1684}
1685
1686static void f2fs_free_dic(struct decompress_io_ctx *dic,
1687 bool bypass_destroy_callback)
1688{
1689 int i;
1690
1691 f2fs_release_decomp_mem(dic, bypass_destroy_callback, pre_alloc: true);
1692
1693 if (dic->tpages) {
1694 for (i = 0; i < dic->cluster_size; i++) {
1695 if (dic->rpages[i])
1696 continue;
1697 if (!dic->tpages[i])
1698 continue;
1699 f2fs_compress_free_page(page: dic->tpages[i]);
1700 }
1701 page_array_free(inode: dic->inode, pages: dic->tpages, nr: dic->cluster_size);
1702 }
1703
1704 if (dic->cpages) {
1705 for (i = 0; i < dic->nr_cpages; i++) {
1706 if (!dic->cpages[i])
1707 continue;
1708 f2fs_compress_free_page(page: dic->cpages[i]);
1709 }
1710 page_array_free(inode: dic->inode, pages: dic->cpages, nr: dic->nr_cpages);
1711 }
1712
1713 page_array_free(inode: dic->inode, pages: dic->rpages, nr: dic->nr_rpages);
1714 kmem_cache_free(s: dic_entry_slab, objp: dic);
1715}
1716
1717static void f2fs_late_free_dic(struct work_struct *work)
1718{
1719 struct decompress_io_ctx *dic =
1720 container_of(work, struct decompress_io_ctx, free_work);
1721
1722 f2fs_free_dic(dic, bypass_destroy_callback: false);
1723}
1724
1725static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
1726{
1727 if (refcount_dec_and_test(r: &dic->refcnt)) {
1728 if (in_task) {
1729 f2fs_free_dic(dic, bypass_destroy_callback: false);
1730 } else {
1731 INIT_WORK(&dic->free_work, f2fs_late_free_dic);
1732 queue_work(wq: F2FS_I_SB(inode: dic->inode)->post_read_wq,
1733 work: &dic->free_work);
1734 }
1735 }
1736}
1737
1738static void f2fs_verify_cluster(struct work_struct *work)
1739{
1740 struct decompress_io_ctx *dic =
1741 container_of(work, struct decompress_io_ctx, verity_work);
1742 int i;
1743
1744 /* Verify, update, and unlock the decompressed pages. */
1745 for (i = 0; i < dic->cluster_size; i++) {
1746 struct page *rpage = dic->rpages[i];
1747
1748 if (!rpage)
1749 continue;
1750
1751 if (fsverity_verify_page(page: rpage))
1752 SetPageUptodate(rpage);
1753 else
1754 ClearPageUptodate(page: rpage);
1755 unlock_page(page: rpage);
1756 }
1757
1758 f2fs_put_dic(dic, in_task: true);
1759}
1760
1761/*
1762 * This is called when a compressed cluster has been decompressed
1763 * (or failed to be read and/or decompressed).
1764 */
1765void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
1766 bool in_task)
1767{
1768 int i;
1769
1770 if (!failed && dic->need_verity) {
1771 /*
1772 * Note that to avoid deadlocks, the verity work can't be done
1773 * on the decompression workqueue. This is because verifying
1774 * the data pages can involve reading metadata pages from the
1775 * file, and these metadata pages may be compressed.
1776 */
1777 INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1778 fsverity_enqueue_verify_work(work: &dic->verity_work);
1779 return;
1780 }
1781
1782 /* Update and unlock the cluster's pagecache pages. */
1783 for (i = 0; i < dic->cluster_size; i++) {
1784 struct page *rpage = dic->rpages[i];
1785
1786 if (!rpage)
1787 continue;
1788
1789 if (failed)
1790 ClearPageUptodate(page: rpage);
1791 else
1792 SetPageUptodate(rpage);
1793 unlock_page(page: rpage);
1794 }
1795
1796 /*
1797 * Release the reference to the decompress_io_ctx that was being held
1798 * for I/O completion.
1799 */
1800 f2fs_put_dic(dic, in_task);
1801}
1802
1803/*
1804 * Put a reference to a compressed page's decompress_io_ctx.
1805 *
1806 * This is called when the page is no longer needed and can be freed.
1807 */
1808void f2fs_put_page_dic(struct page *page, bool in_task)
1809{
1810 struct decompress_io_ctx *dic =
1811 (struct decompress_io_ctx *)page_private(page);
1812
1813 f2fs_put_dic(dic, in_task);
1814}
1815
1816/*
1817 * check whether cluster blocks are contiguous, and add extent cache entry
1818 * only if cluster blocks are logically and physically contiguous.
1819 */
1820unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn,
1821 unsigned int ofs_in_node)
1822{
1823 bool compressed = data_blkaddr(inode: dn->inode, node_page: dn->node_page,
1824 offset: ofs_in_node) == COMPRESS_ADDR;
1825 int i = compressed ? 1 : 0;
1826 block_t first_blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page,
1827 offset: ofs_in_node + i);
1828
1829 for (i += 1; i < F2FS_I(inode: dn->inode)->i_cluster_size; i++) {
1830 block_t blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page,
1831 offset: ofs_in_node + i);
1832
1833 if (!__is_valid_data_blkaddr(blkaddr))
1834 break;
1835 if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
1836 return 0;
1837 }
1838
1839 return compressed ? i - 1 : i;
1840}
1841
1842const struct address_space_operations f2fs_compress_aops = {
1843 .release_folio = f2fs_release_folio,
1844 .invalidate_folio = f2fs_invalidate_folio,
1845 .migrate_folio = filemap_migrate_folio,
1846};
1847
1848struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1849{
1850 return sbi->compress_inode->i_mapping;
1851}
1852
1853void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
1854{
1855 if (!sbi->compress_inode)
1856 return;
1857 invalidate_mapping_pages(mapping: COMPRESS_MAPPING(sbi), start: blkaddr, end: blkaddr);
1858}
1859
1860void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1861 nid_t ino, block_t blkaddr)
1862{
1863 struct page *cpage;
1864 int ret;
1865
1866 if (!test_opt(sbi, COMPRESS_CACHE))
1867 return;
1868
1869 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, type: DATA_GENERIC_ENHANCE_READ))
1870 return;
1871
1872 if (!f2fs_available_free_memory(sbi, type: COMPRESS_PAGE))
1873 return;
1874
1875 cpage = find_get_page(mapping: COMPRESS_MAPPING(sbi), offset: blkaddr);
1876 if (cpage) {
1877 f2fs_put_page(page: cpage, unlock: 0);
1878 return;
1879 }
1880
1881 cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
1882 if (!cpage)
1883 return;
1884
1885 ret = add_to_page_cache_lru(page: cpage, mapping: COMPRESS_MAPPING(sbi),
1886 index: blkaddr, GFP_NOFS);
1887 if (ret) {
1888 f2fs_put_page(page: cpage, unlock: 0);
1889 return;
1890 }
1891
1892 set_page_private_data(page: cpage, data: ino);
1893
1894 memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
1895 SetPageUptodate(cpage);
1896 f2fs_put_page(page: cpage, unlock: 1);
1897}
1898
1899bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1900 block_t blkaddr)
1901{
1902 struct page *cpage;
1903 bool hitted = false;
1904
1905 if (!test_opt(sbi, COMPRESS_CACHE))
1906 return false;
1907
1908 cpage = f2fs_pagecache_get_page(mapping: COMPRESS_MAPPING(sbi),
1909 index: blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1910 if (cpage) {
1911 if (PageUptodate(page: cpage)) {
1912 atomic_inc(v: &sbi->compress_page_hit);
1913 memcpy(page_address(page),
1914 page_address(cpage), PAGE_SIZE);
1915 hitted = true;
1916 }
1917 f2fs_put_page(page: cpage, unlock: 1);
1918 }
1919
1920 return hitted;
1921}
1922
1923void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1924{
1925 struct address_space *mapping = COMPRESS_MAPPING(sbi);
1926 struct folio_batch fbatch;
1927 pgoff_t index = 0;
1928 pgoff_t end = MAX_BLKADDR(sbi);
1929
1930 if (!mapping->nrpages)
1931 return;
1932
1933 folio_batch_init(fbatch: &fbatch);
1934
1935 do {
1936 unsigned int nr, i;
1937
1938 nr = filemap_get_folios(mapping, start: &index, end: end - 1, fbatch: &fbatch);
1939 if (!nr)
1940 break;
1941
1942 for (i = 0; i < nr; i++) {
1943 struct folio *folio = fbatch.folios[i];
1944
1945 folio_lock(folio);
1946 if (folio->mapping != mapping) {
1947 folio_unlock(folio);
1948 continue;
1949 }
1950
1951 if (ino != get_page_private_data(page: &folio->page)) {
1952 folio_unlock(folio);
1953 continue;
1954 }
1955
1956 generic_error_remove_folio(mapping, folio);
1957 folio_unlock(folio);
1958 }
1959 folio_batch_release(fbatch: &fbatch);
1960 cond_resched();
1961 } while (index < end);
1962}
1963
1964int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
1965{
1966 struct inode *inode;
1967
1968 if (!test_opt(sbi, COMPRESS_CACHE))
1969 return 0;
1970
1971 inode = f2fs_iget(sb: sbi->sb, F2FS_COMPRESS_INO(sbi));
1972 if (IS_ERR(ptr: inode))
1973 return PTR_ERR(ptr: inode);
1974 sbi->compress_inode = inode;
1975
1976 sbi->compress_percent = COMPRESS_PERCENT;
1977 sbi->compress_watermark = COMPRESS_WATERMARK;
1978
1979 atomic_set(v: &sbi->compress_page_hit, i: 0);
1980
1981 return 0;
1982}
1983
1984void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
1985{
1986 if (!sbi->compress_inode)
1987 return;
1988 iput(sbi->compress_inode);
1989 sbi->compress_inode = NULL;
1990}
1991
1992int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1993{
1994 dev_t dev = sbi->sb->s_bdev->bd_dev;
1995 char slab_name[35];
1996
1997 if (!f2fs_sb_has_compression(sbi))
1998 return 0;
1999
2000 sprintf(buf: slab_name, fmt: "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
2001
2002 sbi->page_array_slab_size = sizeof(struct page *) <<
2003 F2FS_OPTION(sbi).compress_log_size;
2004
2005 sbi->page_array_slab = f2fs_kmem_cache_create(name: slab_name,
2006 size: sbi->page_array_slab_size);
2007 return sbi->page_array_slab ? 0 : -ENOMEM;
2008}
2009
2010void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
2011{
2012 kmem_cache_destroy(s: sbi->page_array_slab);
2013}
2014
2015int __init f2fs_init_compress_cache(void)
2016{
2017 cic_entry_slab = f2fs_kmem_cache_create(name: "f2fs_cic_entry",
2018 size: sizeof(struct compress_io_ctx));
2019 if (!cic_entry_slab)
2020 return -ENOMEM;
2021 dic_entry_slab = f2fs_kmem_cache_create(name: "f2fs_dic_entry",
2022 size: sizeof(struct decompress_io_ctx));
2023 if (!dic_entry_slab)
2024 goto free_cic;
2025 return 0;
2026free_cic:
2027 kmem_cache_destroy(s: cic_entry_slab);
2028 return -ENOMEM;
2029}
2030
2031void f2fs_destroy_compress_cache(void)
2032{
2033 kmem_cache_destroy(s: dic_entry_slab);
2034 kmem_cache_destroy(s: cic_entry_slab);
2035}
2036

source code of linux/fs/f2fs/compress.c