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Linux 5.10.7
[linux/fpc-iii.git] / fs / f2fs / compress.c
blobc5fee4d7ea72fea89e2851b39ec46cee954c0dac
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/writeback.h>
11 #include <linux/backing-dev.h>
12 #include <linux/lzo.h>
13 #include <linux/lz4.h>
14 #include <linux/zstd.h>
15
16 #include "f2fs.h"
17 #include "node.h"
18 #include <trace/events/f2fs.h>
19
20 static struct kmem_cache *cic_entry_slab;
21 static struct kmem_cache *dic_entry_slab;
22
23 static void *page_array_alloc(struct inode *inode, int nr)
24 {
25 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
26 unsigned int size = sizeof(struct page *) * nr;
27
28 if (likely(size <= sbi->page_array_slab_size))
29 return kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS);
30 return f2fs_kzalloc(sbi, size, GFP_NOFS);
31 }
32
33 static void page_array_free(struct inode *inode, void *pages, int nr)
34 {
35 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
36 unsigned int size = sizeof(struct page *) * nr;
37
38 if (!pages)
39 return;
40
41 if (likely(size <= sbi->page_array_slab_size))
42 kmem_cache_free(sbi->page_array_slab, pages);
43 else
44 kfree(pages);
45 }
46
47 struct f2fs_compress_ops {
48 int (*init_compress_ctx)(struct compress_ctx *cc);
49 void (*destroy_compress_ctx)(struct compress_ctx *cc);
50 int (*compress_pages)(struct compress_ctx *cc);
51 int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
52 void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
53 int (*decompress_pages)(struct decompress_io_ctx *dic);
54 };
55
56 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
57 {
58 return index & (cc->cluster_size - 1);
59 }
60
61 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
62 {
63 return index >> cc->log_cluster_size;
64 }
65
66 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
67 {
68 return cc->cluster_idx << cc->log_cluster_size;
69 }
70
71 bool f2fs_is_compressed_page(struct page *page)
72 {
73 if (!PagePrivate(page))
74 return false;
75 if (!page_private(page))
76 return false;
77 if (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
78 return false;
79 /*
80 * page->private may be set with pid.
81 * pid_max is enough to check if it is traced.
82 */
83 if (IS_IO_TRACED_PAGE(page))
84 return false;
85
86 f2fs_bug_on(F2FS_M_SB(page->mapping),
87 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
88 return true;
89 }
90
91 static void f2fs_set_compressed_page(struct page *page,
92 struct inode *inode, pgoff_t index, void *data)
93 {
94 SetPagePrivate(page);
95 set_page_private(page, (unsigned long)data);
96
97 /* i_crypto_info and iv index */
98 page->index = index;
99 page->mapping = inode->i_mapping;
100 }
101
102 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
103 {
104 int i;
105
106 for (i = 0; i < len; i++) {
107 if (!cc->rpages[i])
108 continue;
109 if (unlock)
110 unlock_page(cc->rpages[i]);
111 else
112 put_page(cc->rpages[i]);
113 }
114 }
115
116 static void f2fs_put_rpages(struct compress_ctx *cc)
117 {
118 f2fs_drop_rpages(cc, cc->cluster_size, false);
119 }
120
121 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
122 {
123 f2fs_drop_rpages(cc, len, true);
124 }
125
126 static void f2fs_put_rpages_mapping(struct address_space *mapping,
127 pgoff_t start, int len)
128 {
129 int i;
130
131 for (i = 0; i < len; i++) {
132 struct page *page = find_get_page(mapping, start + i);
133
134 put_page(page);
135 put_page(page);
136 }
137 }
138
139 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
140 struct writeback_control *wbc, bool redirty, int unlock)
141 {
142 unsigned int i;
143
144 for (i = 0; i < cc->cluster_size; i++) {
145 if (!cc->rpages[i])
146 continue;
147 if (redirty)
148 redirty_page_for_writepage(wbc, cc->rpages[i]);
149 f2fs_put_page(cc->rpages[i], unlock);
150 }
151 }
152
153 struct page *f2fs_compress_control_page(struct page *page)
154 {
155 return ((struct compress_io_ctx *)page_private(page))->rpages[0];
156 }
157
158 int f2fs_init_compress_ctx(struct compress_ctx *cc)
159 {
160 if (cc->rpages)
161 return 0;
162
163 cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
164 return cc->rpages ? 0 : -ENOMEM;
165 }
166
167 void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
168 {
169 page_array_free(cc->inode, cc->rpages, cc->cluster_size);
170 cc->rpages = NULL;
171 cc->nr_rpages = 0;
172 cc->nr_cpages = 0;
173 cc->cluster_idx = NULL_CLUSTER;
174 }
175
176 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
177 {
178 unsigned int cluster_ofs;
179
180 if (!f2fs_cluster_can_merge_page(cc, page->index))
181 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
182
183 cluster_ofs = offset_in_cluster(cc, page->index);
184 cc->rpages[cluster_ofs] = page;
185 cc->nr_rpages++;
186 cc->cluster_idx = cluster_idx(cc, page->index);
187 }
188
189 #ifdef CONFIG_F2FS_FS_LZO
190 static int lzo_init_compress_ctx(struct compress_ctx *cc)
191 {
192 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
193 LZO1X_MEM_COMPRESS, GFP_NOFS);
194 if (!cc->private)
195 return -ENOMEM;
196
197 cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
198 return 0;
199 }
200
201 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
202 {
203 kvfree(cc->private);
204 cc->private = NULL;
205 }
206
207 static int lzo_compress_pages(struct compress_ctx *cc)
208 {
209 int ret;
210
211 ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
212 &cc->clen, cc->private);
213 if (ret != LZO_E_OK) {
214 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
215 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
216 return -EIO;
217 }
218 return 0;
219 }
220
221 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
222 {
223 int ret;
224
225 ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
226 dic->rbuf, &dic->rlen);
227 if (ret != LZO_E_OK) {
228 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
229 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
230 return -EIO;
231 }
232
233 if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
234 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
235 "expected:%lu\n", KERN_ERR,
236 F2FS_I_SB(dic->inode)->sb->s_id,
237 dic->rlen,
238 PAGE_SIZE << dic->log_cluster_size);
239 return -EIO;
240 }
241 return 0;
242 }
243
244 static const struct f2fs_compress_ops f2fs_lzo_ops = {
245 .init_compress_ctx = lzo_init_compress_ctx,
246 .destroy_compress_ctx = lzo_destroy_compress_ctx,
247 .compress_pages = lzo_compress_pages,
248 .decompress_pages = lzo_decompress_pages,
249 };
250 #endif
251
252 #ifdef CONFIG_F2FS_FS_LZ4
253 static int lz4_init_compress_ctx(struct compress_ctx *cc)
254 {
255 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
256 LZ4_MEM_COMPRESS, GFP_NOFS);
257 if (!cc->private)
258 return -ENOMEM;
259
260 /*
261 * we do not change cc->clen to LZ4_compressBound(inputsize) to
262 * adapt worst compress case, because lz4 compressor can handle
263 * output budget properly.
264 */
265 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
266 return 0;
267 }
268
269 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
270 {
271 kvfree(cc->private);
272 cc->private = NULL;
273 }
274
275 static int lz4_compress_pages(struct compress_ctx *cc)
276 {
277 int len;
278
279 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
280 cc->clen, cc->private);
281 if (!len)
282 return -EAGAIN;
283
284 cc->clen = len;
285 return 0;
286 }
287
288 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
289 {
290 int ret;
291
292 ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
293 dic->clen, dic->rlen);
294 if (ret < 0) {
295 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
296 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
297 return -EIO;
298 }
299
300 if (ret != PAGE_SIZE << dic->log_cluster_size) {
301 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
302 "expected:%lu\n", KERN_ERR,
303 F2FS_I_SB(dic->inode)->sb->s_id,
304 dic->rlen,
305 PAGE_SIZE << dic->log_cluster_size);
306 return -EIO;
307 }
308 return 0;
309 }
310
311 static const struct f2fs_compress_ops f2fs_lz4_ops = {
312 .init_compress_ctx = lz4_init_compress_ctx,
313 .destroy_compress_ctx = lz4_destroy_compress_ctx,
314 .compress_pages = lz4_compress_pages,
315 .decompress_pages = lz4_decompress_pages,
316 };
317 #endif
318
319 #ifdef CONFIG_F2FS_FS_ZSTD
320 #define F2FS_ZSTD_DEFAULT_CLEVEL 1
321
322 static int zstd_init_compress_ctx(struct compress_ctx *cc)
323 {
324 ZSTD_parameters params;
325 ZSTD_CStream *stream;
326 void *workspace;
327 unsigned int workspace_size;
328
329 params = ZSTD_getParams(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen, 0);
330 workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
331
332 workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
333 workspace_size, GFP_NOFS);
334 if (!workspace)
335 return -ENOMEM;
336
337 stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
338 if (!stream) {
339 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
340 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
341 __func__);
342 kvfree(workspace);
343 return -EIO;
344 }
345
346 cc->private = workspace;
347 cc->private2 = stream;
348
349 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
350 return 0;
351 }
352
353 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
354 {
355 kvfree(cc->private);
356 cc->private = NULL;
357 cc->private2 = NULL;
358 }
359
360 static int zstd_compress_pages(struct compress_ctx *cc)
361 {
362 ZSTD_CStream *stream = cc->private2;
363 ZSTD_inBuffer inbuf;
364 ZSTD_outBuffer outbuf;
365 int src_size = cc->rlen;
366 int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
367 int ret;
368
369 inbuf.pos = 0;
370 inbuf.src = cc->rbuf;
371 inbuf.size = src_size;
372
373 outbuf.pos = 0;
374 outbuf.dst = cc->cbuf->cdata;
375 outbuf.size = dst_size;
376
377 ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
378 if (ZSTD_isError(ret)) {
379 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
380 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
381 __func__, ZSTD_getErrorCode(ret));
382 return -EIO;
383 }
384
385 ret = ZSTD_endStream(stream, &outbuf);
386 if (ZSTD_isError(ret)) {
387 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
388 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
389 __func__, ZSTD_getErrorCode(ret));
390 return -EIO;
391 }
392
393 /*
394 * there is compressed data remained in intermediate buffer due to
395 * no more space in cbuf.cdata
396 */
397 if (ret)
398 return -EAGAIN;
399
400 cc->clen = outbuf.pos;
401 return 0;
402 }
403
404 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
405 {
406 ZSTD_DStream *stream;
407 void *workspace;
408 unsigned int workspace_size;
409 unsigned int max_window_size =
410 MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
411
412 workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
413
414 workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
415 workspace_size, GFP_NOFS);
416 if (!workspace)
417 return -ENOMEM;
418
419 stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
420 if (!stream) {
421 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
422 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
423 __func__);
424 kvfree(workspace);
425 return -EIO;
426 }
427
428 dic->private = workspace;
429 dic->private2 = stream;
430
431 return 0;
432 }
433
434 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
435 {
436 kvfree(dic->private);
437 dic->private = NULL;
438 dic->private2 = NULL;
439 }
440
441 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
442 {
443 ZSTD_DStream *stream = dic->private2;
444 ZSTD_inBuffer inbuf;
445 ZSTD_outBuffer outbuf;
446 int ret;
447
448 inbuf.pos = 0;
449 inbuf.src = dic->cbuf->cdata;
450 inbuf.size = dic->clen;
451
452 outbuf.pos = 0;
453 outbuf.dst = dic->rbuf;
454 outbuf.size = dic->rlen;
455
456 ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
457 if (ZSTD_isError(ret)) {
458 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
459 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
460 __func__, ZSTD_getErrorCode(ret));
461 return -EIO;
462 }
463
464 if (dic->rlen != outbuf.pos) {
465 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
466 "expected:%lu\n", KERN_ERR,
467 F2FS_I_SB(dic->inode)->sb->s_id,
468 __func__, dic->rlen,
469 PAGE_SIZE << dic->log_cluster_size);
470 return -EIO;
471 }
472
473 return 0;
474 }
475
476 static const struct f2fs_compress_ops f2fs_zstd_ops = {
477 .init_compress_ctx = zstd_init_compress_ctx,
478 .destroy_compress_ctx = zstd_destroy_compress_ctx,
479 .compress_pages = zstd_compress_pages,
480 .init_decompress_ctx = zstd_init_decompress_ctx,
481 .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
482 .decompress_pages = zstd_decompress_pages,
483 };
484 #endif
485
486 #ifdef CONFIG_F2FS_FS_LZO
487 #ifdef CONFIG_F2FS_FS_LZORLE
488 static int lzorle_compress_pages(struct compress_ctx *cc)
489 {
490 int ret;
491
492 ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
493 &cc->clen, cc->private);
494 if (ret != LZO_E_OK) {
495 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
496 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
497 return -EIO;
498 }
499 return 0;
500 }
501
502 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
503 .init_compress_ctx = lzo_init_compress_ctx,
504 .destroy_compress_ctx = lzo_destroy_compress_ctx,
505 .compress_pages = lzorle_compress_pages,
506 .decompress_pages = lzo_decompress_pages,
507 };
508 #endif
509 #endif
510
511 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
512 #ifdef CONFIG_F2FS_FS_LZO
513 &f2fs_lzo_ops,
514 #else
515 NULL,
516 #endif
517 #ifdef CONFIG_F2FS_FS_LZ4
518 &f2fs_lz4_ops,
519 #else
520 NULL,
521 #endif
522 #ifdef CONFIG_F2FS_FS_ZSTD
523 &f2fs_zstd_ops,
524 #else
525 NULL,
526 #endif
527 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
528 &f2fs_lzorle_ops,
529 #else
530 NULL,
531 #endif
532 };
533
534 bool f2fs_is_compress_backend_ready(struct inode *inode)
535 {
536 if (!f2fs_compressed_file(inode))
537 return true;
538 return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
539 }
540
541 static mempool_t *compress_page_pool;
542 static int num_compress_pages = 512;
543 module_param(num_compress_pages, uint, 0444);
544 MODULE_PARM_DESC(num_compress_pages,
545 "Number of intermediate compress pages to preallocate");
546
547 int f2fs_init_compress_mempool(void)
548 {
549 compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
550 if (!compress_page_pool)
551 return -ENOMEM;
552
553 return 0;
554 }
555
556 void f2fs_destroy_compress_mempool(void)
557 {
558 mempool_destroy(compress_page_pool);
559 }
560
561 static struct page *f2fs_compress_alloc_page(void)
562 {
563 struct page *page;
564
565 page = mempool_alloc(compress_page_pool, GFP_NOFS);
566 lock_page(page);
567
568 return page;
569 }
570
571 static void f2fs_compress_free_page(struct page *page)
572 {
573 if (!page)
574 return;
575 set_page_private(page, (unsigned long)NULL);
576 ClearPagePrivate(page);
577 page->mapping = NULL;
578 unlock_page(page);
579 mempool_free(page, compress_page_pool);
580 }
581
582 #define MAX_VMAP_RETRIES 3
583
584 static void *f2fs_vmap(struct page **pages, unsigned int count)
585 {
586 int i;
587 void *buf = NULL;
588
589 for (i = 0; i < MAX_VMAP_RETRIES; i++) {
590 buf = vm_map_ram(pages, count, -1);
591 if (buf)
592 break;
593 vm_unmap_aliases();
594 }
595 return buf;
596 }
597
598 static int f2fs_compress_pages(struct compress_ctx *cc)
599 {
600 struct f2fs_inode_info *fi = F2FS_I(cc->inode);
601 const struct f2fs_compress_ops *cops =
602 f2fs_cops[fi->i_compress_algorithm];
603 unsigned int max_len, new_nr_cpages;
604 struct page **new_cpages;
605 int i, ret;
606
607 trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
608 cc->cluster_size, fi->i_compress_algorithm);
609
610 if (cops->init_compress_ctx) {
611 ret = cops->init_compress_ctx(cc);
612 if (ret)
613 goto out;
614 }
615
616 max_len = COMPRESS_HEADER_SIZE + cc->clen;
617 cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
618
619 cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
620 if (!cc->cpages) {
621 ret = -ENOMEM;
622 goto destroy_compress_ctx;
623 }
624
625 for (i = 0; i < cc->nr_cpages; i++) {
626 cc->cpages[i] = f2fs_compress_alloc_page();
627 if (!cc->cpages[i]) {
628 ret = -ENOMEM;
629 goto out_free_cpages;
630 }
631 }
632
633 cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
634 if (!cc->rbuf) {
635 ret = -ENOMEM;
636 goto out_free_cpages;
637 }
638
639 cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
640 if (!cc->cbuf) {
641 ret = -ENOMEM;
642 goto out_vunmap_rbuf;
643 }
644
645 ret = cops->compress_pages(cc);
646 if (ret)
647 goto out_vunmap_cbuf;
648
649 max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
650
651 if (cc->clen > max_len) {
652 ret = -EAGAIN;
653 goto out_vunmap_cbuf;
654 }
655
656 cc->cbuf->clen = cpu_to_le32(cc->clen);
657
658 for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
659 cc->cbuf->reserved[i] = cpu_to_le32(0);
660
661 new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
662
663 /* Now we're going to cut unnecessary tail pages */
664 new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
665 if (!new_cpages) {
666 ret = -ENOMEM;
667 goto out_vunmap_cbuf;
668 }
669
670 /* zero out any unused part of the last page */
671 memset(&cc->cbuf->cdata[cc->clen], 0,
672 (new_nr_cpages * PAGE_SIZE) -
673 (cc->clen + COMPRESS_HEADER_SIZE));
674
675 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
676 vm_unmap_ram(cc->rbuf, cc->cluster_size);
677
678 for (i = 0; i < cc->nr_cpages; i++) {
679 if (i < new_nr_cpages) {
680 new_cpages[i] = cc->cpages[i];
681 continue;
682 }
683 f2fs_compress_free_page(cc->cpages[i]);
684 cc->cpages[i] = NULL;
685 }
686
687 if (cops->destroy_compress_ctx)
688 cops->destroy_compress_ctx(cc);
689
690 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
691 cc->cpages = new_cpages;
692 cc->nr_cpages = new_nr_cpages;
693
694 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
695 cc->clen, ret);
696 return 0;
697
698 out_vunmap_cbuf:
699 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
700 out_vunmap_rbuf:
701 vm_unmap_ram(cc->rbuf, cc->cluster_size);
702 out_free_cpages:
703 for (i = 0; i < cc->nr_cpages; i++) {
704 if (cc->cpages[i])
705 f2fs_compress_free_page(cc->cpages[i]);
706 }
707 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
708 cc->cpages = NULL;
709 destroy_compress_ctx:
710 if (cops->destroy_compress_ctx)
711 cops->destroy_compress_ctx(cc);
712 out:
713 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
714 cc->clen, ret);
715 return ret;
716 }
717
718 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
719 {
720 struct decompress_io_ctx *dic =
721 (struct decompress_io_ctx *)page_private(page);
722 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
723 struct f2fs_inode_info *fi= F2FS_I(dic->inode);
724 const struct f2fs_compress_ops *cops =
725 f2fs_cops[fi->i_compress_algorithm];
726 int ret;
727 int i;
728
729 dec_page_count(sbi, F2FS_RD_DATA);
730
731 if (bio->bi_status || PageError(page))
732 dic->failed = true;
733
734 if (atomic_dec_return(&dic->pending_pages))
735 return;
736
737 trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
738 dic->cluster_size, fi->i_compress_algorithm);
739
740 /* submit partial compressed pages */
741 if (dic->failed) {
742 ret = -EIO;
743 goto out_free_dic;
744 }
745
746 dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
747 if (!dic->tpages) {
748 ret = -ENOMEM;
749 goto out_free_dic;
750 }
751
752 for (i = 0; i < dic->cluster_size; i++) {
753 if (dic->rpages[i]) {
754 dic->tpages[i] = dic->rpages[i];
755 continue;
756 }
757
758 dic->tpages[i] = f2fs_compress_alloc_page();
759 if (!dic->tpages[i]) {
760 ret = -ENOMEM;
761 goto out_free_dic;
762 }
763 }
764
765 if (cops->init_decompress_ctx) {
766 ret = cops->init_decompress_ctx(dic);
767 if (ret)
768 goto out_free_dic;
769 }
770
771 dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
772 if (!dic->rbuf) {
773 ret = -ENOMEM;
774 goto destroy_decompress_ctx;
775 }
776
777 dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
778 if (!dic->cbuf) {
779 ret = -ENOMEM;
780 goto out_vunmap_rbuf;
781 }
782
783 dic->clen = le32_to_cpu(dic->cbuf->clen);
784 dic->rlen = PAGE_SIZE << dic->log_cluster_size;
785
786 if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
787 ret = -EFSCORRUPTED;
788 goto out_vunmap_cbuf;
789 }
790
791 ret = cops->decompress_pages(dic);
792
793 out_vunmap_cbuf:
794 vm_unmap_ram(dic->cbuf, dic->nr_cpages);
795 out_vunmap_rbuf:
796 vm_unmap_ram(dic->rbuf, dic->cluster_size);
797 destroy_decompress_ctx:
798 if (cops->destroy_decompress_ctx)
799 cops->destroy_decompress_ctx(dic);
800 out_free_dic:
801 if (!verity)
802 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
803 ret, false);
804
805 trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
806 dic->clen, ret);
807 if (!verity)
808 f2fs_free_dic(dic);
809 }
810
811 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
812 {
813 if (cc->cluster_idx == NULL_CLUSTER)
814 return true;
815 return cc->cluster_idx == cluster_idx(cc, index);
816 }
817
818 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
819 {
820 return cc->nr_rpages == 0;
821 }
822
823 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
824 {
825 return cc->cluster_size == cc->nr_rpages;
826 }
827
828 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
829 {
830 if (f2fs_cluster_is_empty(cc))
831 return true;
832 return is_page_in_cluster(cc, index);
833 }
834
835 static bool __cluster_may_compress(struct compress_ctx *cc)
836 {
837 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
838 loff_t i_size = i_size_read(cc->inode);
839 unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
840 int i;
841
842 for (i = 0; i < cc->cluster_size; i++) {
843 struct page *page = cc->rpages[i];
844
845 f2fs_bug_on(sbi, !page);
846
847 if (unlikely(f2fs_cp_error(sbi)))
848 return false;
849 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
850 return false;
851
852 /* beyond EOF */
853 if (page->index >= nr_pages)
854 return false;
855 }
856 return true;
857 }
858
859 static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
860 {
861 struct dnode_of_data dn;
862 int ret;
863
864 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
865 ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
866 LOOKUP_NODE);
867 if (ret) {
868 if (ret == -ENOENT)
869 ret = 0;
870 goto fail;
871 }
872
873 if (dn.data_blkaddr == COMPRESS_ADDR) {
874 int i;
875
876 ret = 1;
877 for (i = 1; i < cc->cluster_size; i++) {
878 block_t blkaddr;
879
880 blkaddr = data_blkaddr(dn.inode,
881 dn.node_page, dn.ofs_in_node + i);
882 if (compr) {
883 if (__is_valid_data_blkaddr(blkaddr))
884 ret++;
885 } else {
886 if (blkaddr != NULL_ADDR)
887 ret++;
888 }
889 }
890 }
891 fail:
892 f2fs_put_dnode(&dn);
893 return ret;
894 }
895
896 /* return # of compressed blocks in compressed cluster */
897 static int f2fs_compressed_blocks(struct compress_ctx *cc)
898 {
899 return __f2fs_cluster_blocks(cc, true);
900 }
901
902 /* return # of valid blocks in compressed cluster */
903 static int f2fs_cluster_blocks(struct compress_ctx *cc)
904 {
905 return __f2fs_cluster_blocks(cc, false);
906 }
907
908 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
909 {
910 struct compress_ctx cc = {
911 .inode = inode,
912 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
913 .cluster_size = F2FS_I(inode)->i_cluster_size,
914 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
915 };
916
917 return f2fs_cluster_blocks(&cc);
918 }
919
920 static bool cluster_may_compress(struct compress_ctx *cc)
921 {
922 if (!f2fs_compressed_file(cc->inode))
923 return false;
924 if (f2fs_is_atomic_file(cc->inode))
925 return false;
926 if (f2fs_is_mmap_file(cc->inode))
927 return false;
928 if (!f2fs_cluster_is_full(cc))
929 return false;
930 if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
931 return false;
932 return __cluster_may_compress(cc);
933 }
934
935 static void set_cluster_writeback(struct compress_ctx *cc)
936 {
937 int i;
938
939 for (i = 0; i < cc->cluster_size; i++) {
940 if (cc->rpages[i])
941 set_page_writeback(cc->rpages[i]);
942 }
943 }
944
945 static void set_cluster_dirty(struct compress_ctx *cc)
946 {
947 int i;
948
949 for (i = 0; i < cc->cluster_size; i++)
950 if (cc->rpages[i])
951 set_page_dirty(cc->rpages[i]);
952 }
953
954 static int prepare_compress_overwrite(struct compress_ctx *cc,
955 struct page **pagep, pgoff_t index, void **fsdata)
956 {
957 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
958 struct address_space *mapping = cc->inode->i_mapping;
959 struct page *page;
960 struct dnode_of_data dn;
961 sector_t last_block_in_bio;
962 unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
963 pgoff_t start_idx = start_idx_of_cluster(cc);
964 int i, ret;
965 bool prealloc;
966
967 retry:
968 ret = f2fs_cluster_blocks(cc);
969 if (ret <= 0)
970 return ret;
971
972 /* compressed case */
973 prealloc = (ret < cc->cluster_size);
974
975 ret = f2fs_init_compress_ctx(cc);
976 if (ret)
977 return ret;
978
979 /* keep page reference to avoid page reclaim */
980 for (i = 0; i < cc->cluster_size; i++) {
981 page = f2fs_pagecache_get_page(mapping, start_idx + i,
982 fgp_flag, GFP_NOFS);
983 if (!page) {
984 ret = -ENOMEM;
985 goto unlock_pages;
986 }
987
988 if (PageUptodate(page))
989 unlock_page(page);
990 else
991 f2fs_compress_ctx_add_page(cc, page);
992 }
993
994 if (!f2fs_cluster_is_empty(cc)) {
995 struct bio *bio = NULL;
996
997 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
998 &last_block_in_bio, false, true);
999 f2fs_destroy_compress_ctx(cc);
1000 if (ret)
1001 goto release_pages;
1002 if (bio)
1003 f2fs_submit_bio(sbi, bio, DATA);
1004
1005 ret = f2fs_init_compress_ctx(cc);
1006 if (ret)
1007 goto release_pages;
1008 }
1009
1010 for (i = 0; i < cc->cluster_size; i++) {
1011 f2fs_bug_on(sbi, cc->rpages[i]);
1012
1013 page = find_lock_page(mapping, start_idx + i);
1014 f2fs_bug_on(sbi, !page);
1015
1016 f2fs_wait_on_page_writeback(page, DATA, true, true);
1017
1018 f2fs_compress_ctx_add_page(cc, page);
1019 f2fs_put_page(page, 0);
1020
1021 if (!PageUptodate(page)) {
1022 f2fs_unlock_rpages(cc, i + 1);
1023 f2fs_put_rpages_mapping(mapping, start_idx,
1024 cc->cluster_size);
1025 f2fs_destroy_compress_ctx(cc);
1026 goto retry;
1027 }
1028 }
1029
1030 if (prealloc) {
1031 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
1032
1033 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1034
1035 for (i = cc->cluster_size - 1; i > 0; i--) {
1036 ret = f2fs_get_block(&dn, start_idx + i);
1037 if (ret) {
1038 i = cc->cluster_size;
1039 break;
1040 }
1041
1042 if (dn.data_blkaddr != NEW_ADDR)
1043 break;
1044 }
1045
1046 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
1047 }
1048
1049 if (likely(!ret)) {
1050 *fsdata = cc->rpages;
1051 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1052 return cc->cluster_size;
1053 }
1054
1055 unlock_pages:
1056 f2fs_unlock_rpages(cc, i);
1057 release_pages:
1058 f2fs_put_rpages_mapping(mapping, start_idx, i);
1059 f2fs_destroy_compress_ctx(cc);
1060 return ret;
1061 }
1062
1063 int f2fs_prepare_compress_overwrite(struct inode *inode,
1064 struct page **pagep, pgoff_t index, void **fsdata)
1065 {
1066 struct compress_ctx cc = {
1067 .inode = inode,
1068 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1069 .cluster_size = F2FS_I(inode)->i_cluster_size,
1070 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1071 .rpages = NULL,
1072 .nr_rpages = 0,
1073 };
1074
1075 return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1076 }
1077
1078 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1079 pgoff_t index, unsigned copied)
1080
1081 {
1082 struct compress_ctx cc = {
1083 .inode = inode,
1084 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1085 .cluster_size = F2FS_I(inode)->i_cluster_size,
1086 .rpages = fsdata,
1087 };
1088 bool first_index = (index == cc.rpages[0]->index);
1089
1090 if (copied)
1091 set_cluster_dirty(&cc);
1092
1093 f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1094 f2fs_destroy_compress_ctx(&cc);
1095
1096 return first_index;
1097 }
1098
1099 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1100 {
1101 void *fsdata = NULL;
1102 struct page *pagep;
1103 int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1104 pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1105 log_cluster_size;
1106 int err;
1107
1108 err = f2fs_is_compressed_cluster(inode, start_idx);
1109 if (err < 0)
1110 return err;
1111
1112 /* truncate normal cluster */
1113 if (!err)
1114 return f2fs_do_truncate_blocks(inode, from, lock);
1115
1116 /* truncate compressed cluster */
1117 err = f2fs_prepare_compress_overwrite(inode, &pagep,
1118 start_idx, &fsdata);
1119
1120 /* should not be a normal cluster */
1121 f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1122
1123 if (err <= 0)
1124 return err;
1125
1126 if (err > 0) {
1127 struct page **rpages = fsdata;
1128 int cluster_size = F2FS_I(inode)->i_cluster_size;
1129 int i;
1130
1131 for (i = cluster_size - 1; i >= 0; i--) {
1132 loff_t start = rpages[i]->index << PAGE_SHIFT;
1133
1134 if (from <= start) {
1135 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1136 } else {
1137 zero_user_segment(rpages[i], from - start,
1138 PAGE_SIZE);
1139 break;
1140 }
1141 }
1142
1143 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1144 }
1145 return 0;
1146 }
1147
1148 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1149 int *submitted,
1150 struct writeback_control *wbc,
1151 enum iostat_type io_type)
1152 {
1153 struct inode *inode = cc->inode;
1154 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1155 struct f2fs_inode_info *fi = F2FS_I(inode);
1156 struct f2fs_io_info fio = {
1157 .sbi = sbi,
1158 .ino = cc->inode->i_ino,
1159 .type = DATA,
1160 .op = REQ_OP_WRITE,
1161 .op_flags = wbc_to_write_flags(wbc),
1162 .old_blkaddr = NEW_ADDR,
1163 .page = NULL,
1164 .encrypted_page = NULL,
1165 .compressed_page = NULL,
1166 .submitted = false,
1167 .io_type = io_type,
1168 .io_wbc = wbc,
1169 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1170 };
1171 struct dnode_of_data dn;
1172 struct node_info ni;
1173 struct compress_io_ctx *cic;
1174 pgoff_t start_idx = start_idx_of_cluster(cc);
1175 unsigned int last_index = cc->cluster_size - 1;
1176 loff_t psize;
1177 int i, err;
1178
1179 if (IS_NOQUOTA(inode)) {
1180 /*
1181 * We need to wait for node_write to avoid block allocation during
1182 * checkpoint. This can only happen to quota writes which can cause
1183 * the below discard race condition.
1184 */
1185 down_read(&sbi->node_write);
1186 } else if (!f2fs_trylock_op(sbi)) {
1187 goto out_free;
1188 }
1189
1190 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1191
1192 err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1193 if (err)
1194 goto out_unlock_op;
1195
1196 for (i = 0; i < cc->cluster_size; i++) {
1197 if (data_blkaddr(dn.inode, dn.node_page,
1198 dn.ofs_in_node + i) == NULL_ADDR)
1199 goto out_put_dnode;
1200 }
1201
1202 psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1203
1204 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1205 if (err)
1206 goto out_put_dnode;
1207
1208 fio.version = ni.version;
1209
1210 cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1211 if (!cic)
1212 goto out_put_dnode;
1213
1214 cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1215 cic->inode = inode;
1216 atomic_set(&cic->pending_pages, cc->nr_cpages);
1217 cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1218 if (!cic->rpages)
1219 goto out_put_cic;
1220
1221 cic->nr_rpages = cc->cluster_size;
1222
1223 for (i = 0; i < cc->nr_cpages; i++) {
1224 f2fs_set_compressed_page(cc->cpages[i], inode,
1225 cc->rpages[i + 1]->index, cic);
1226 fio.compressed_page = cc->cpages[i];
1227
1228 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1229 dn.ofs_in_node + i + 1);
1230
1231 /* wait for GCed page writeback via META_MAPPING */
1232 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1233
1234 if (fio.encrypted) {
1235 fio.page = cc->rpages[i + 1];
1236 err = f2fs_encrypt_one_page(&fio);
1237 if (err)
1238 goto out_destroy_crypt;
1239 cc->cpages[i] = fio.encrypted_page;
1240 }
1241 }
1242
1243 set_cluster_writeback(cc);
1244
1245 for (i = 0; i < cc->cluster_size; i++)
1246 cic->rpages[i] = cc->rpages[i];
1247
1248 for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1249 block_t blkaddr;
1250
1251 blkaddr = f2fs_data_blkaddr(&dn);
1252 fio.page = cc->rpages[i];
1253 fio.old_blkaddr = blkaddr;
1254
1255 /* cluster header */
1256 if (i == 0) {
1257 if (blkaddr == COMPRESS_ADDR)
1258 fio.compr_blocks++;
1259 if (__is_valid_data_blkaddr(blkaddr))
1260 f2fs_invalidate_blocks(sbi, blkaddr);
1261 f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1262 goto unlock_continue;
1263 }
1264
1265 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1266 fio.compr_blocks++;
1267
1268 if (i > cc->nr_cpages) {
1269 if (__is_valid_data_blkaddr(blkaddr)) {
1270 f2fs_invalidate_blocks(sbi, blkaddr);
1271 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1272 }
1273 goto unlock_continue;
1274 }
1275
1276 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1277
1278 if (fio.encrypted)
1279 fio.encrypted_page = cc->cpages[i - 1];
1280 else
1281 fio.compressed_page = cc->cpages[i - 1];
1282
1283 cc->cpages[i - 1] = NULL;
1284 f2fs_outplace_write_data(&dn, &fio);
1285 (*submitted)++;
1286 unlock_continue:
1287 inode_dec_dirty_pages(cc->inode);
1288 unlock_page(fio.page);
1289 }
1290
1291 if (fio.compr_blocks)
1292 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1293 f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1294
1295 set_inode_flag(cc->inode, FI_APPEND_WRITE);
1296 if (cc->cluster_idx == 0)
1297 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1298
1299 f2fs_put_dnode(&dn);
1300 if (IS_NOQUOTA(inode))
1301 up_read(&sbi->node_write);
1302 else
1303 f2fs_unlock_op(sbi);
1304
1305 spin_lock(&fi->i_size_lock);
1306 if (fi->last_disk_size < psize)
1307 fi->last_disk_size = psize;
1308 spin_unlock(&fi->i_size_lock);
1309
1310 f2fs_put_rpages(cc);
1311 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1312 cc->cpages = NULL;
1313 f2fs_destroy_compress_ctx(cc);
1314 return 0;
1315
1316 out_destroy_crypt:
1317 page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1318
1319 for (--i; i >= 0; i--)
1320 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1321 for (i = 0; i < cc->nr_cpages; i++) {
1322 if (!cc->cpages[i])
1323 continue;
1324 f2fs_put_page(cc->cpages[i], 1);
1325 }
1326 out_put_cic:
1327 kmem_cache_free(cic_entry_slab, cic);
1328 out_put_dnode:
1329 f2fs_put_dnode(&dn);
1330 out_unlock_op:
1331 if (IS_NOQUOTA(inode))
1332 up_read(&sbi->node_write);
1333 else
1334 f2fs_unlock_op(sbi);
1335 out_free:
1336 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1337 cc->cpages = NULL;
1338 return -EAGAIN;
1339 }
1340
1341 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1342 {
1343 struct f2fs_sb_info *sbi = bio->bi_private;
1344 struct compress_io_ctx *cic =
1345 (struct compress_io_ctx *)page_private(page);
1346 int i;
1347
1348 if (unlikely(bio->bi_status))
1349 mapping_set_error(cic->inode->i_mapping, -EIO);
1350
1351 f2fs_compress_free_page(page);
1352
1353 dec_page_count(sbi, F2FS_WB_DATA);
1354
1355 if (atomic_dec_return(&cic->pending_pages))
1356 return;
1357
1358 for (i = 0; i < cic->nr_rpages; i++) {
1359 WARN_ON(!cic->rpages[i]);
1360 clear_cold_data(cic->rpages[i]);
1361 end_page_writeback(cic->rpages[i]);
1362 }
1363
1364 page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1365 kmem_cache_free(cic_entry_slab, cic);
1366 }
1367
1368 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1369 int *submitted,
1370 struct writeback_control *wbc,
1371 enum iostat_type io_type)
1372 {
1373 struct address_space *mapping = cc->inode->i_mapping;
1374 int _submitted, compr_blocks, ret;
1375 int i = -1, err = 0;
1376
1377 compr_blocks = f2fs_compressed_blocks(cc);
1378 if (compr_blocks < 0) {
1379 err = compr_blocks;
1380 goto out_err;
1381 }
1382
1383 for (i = 0; i < cc->cluster_size; i++) {
1384 if (!cc->rpages[i])
1385 continue;
1386 retry_write:
1387 if (cc->rpages[i]->mapping != mapping) {
1388 unlock_page(cc->rpages[i]);
1389 continue;
1390 }
1391
1392 BUG_ON(!PageLocked(cc->rpages[i]));
1393
1394 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1395 NULL, NULL, wbc, io_type,
1396 compr_blocks);
1397 if (ret) {
1398 if (ret == AOP_WRITEPAGE_ACTIVATE) {
1399 unlock_page(cc->rpages[i]);
1400 ret = 0;
1401 } else if (ret == -EAGAIN) {
1402 /*
1403 * for quota file, just redirty left pages to
1404 * avoid deadlock caused by cluster update race
1405 * from foreground operation.
1406 */
1407 if (IS_NOQUOTA(cc->inode)) {
1408 err = 0;
1409 goto out_err;
1410 }
1411 ret = 0;
1412 cond_resched();
1413 congestion_wait(BLK_RW_ASYNC,
1414 DEFAULT_IO_TIMEOUT);
1415 lock_page(cc->rpages[i]);
1416
1417 if (!PageDirty(cc->rpages[i])) {
1418 unlock_page(cc->rpages[i]);
1419 continue;
1420 }
1421
1422 clear_page_dirty_for_io(cc->rpages[i]);
1423 goto retry_write;
1424 }
1425 err = ret;
1426 goto out_err;
1427 }
1428
1429 *submitted += _submitted;
1430 }
1431 return 0;
1432 out_err:
1433 for (++i; i < cc->cluster_size; i++) {
1434 if (!cc->rpages[i])
1435 continue;
1436 redirty_page_for_writepage(wbc, cc->rpages[i]);
1437 unlock_page(cc->rpages[i]);
1438 }
1439 return err;
1440 }
1441
1442 int f2fs_write_multi_pages(struct compress_ctx *cc,
1443 int *submitted,
1444 struct writeback_control *wbc,
1445 enum iostat_type io_type)
1446 {
1447 int err;
1448
1449 *submitted = 0;
1450 if (cluster_may_compress(cc)) {
1451 err = f2fs_compress_pages(cc);
1452 if (err == -EAGAIN) {
1453 goto write;
1454 } else if (err) {
1455 f2fs_put_rpages_wbc(cc, wbc, true, 1);
1456 goto destroy_out;
1457 }
1458
1459 err = f2fs_write_compressed_pages(cc, submitted,
1460 wbc, io_type);
1461 if (!err)
1462 return 0;
1463 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1464 }
1465 write:
1466 f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1467
1468 err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1469 f2fs_put_rpages_wbc(cc, wbc, false, 0);
1470 destroy_out:
1471 f2fs_destroy_compress_ctx(cc);
1472 return err;
1473 }
1474
1475 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1476 {
1477 struct decompress_io_ctx *dic;
1478 pgoff_t start_idx = start_idx_of_cluster(cc);
1479 int i;
1480
1481 dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1482 if (!dic)
1483 return ERR_PTR(-ENOMEM);
1484
1485 dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1486 if (!dic->rpages) {
1487 kmem_cache_free(dic_entry_slab, dic);
1488 return ERR_PTR(-ENOMEM);
1489 }
1490
1491 dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1492 dic->inode = cc->inode;
1493 atomic_set(&dic->pending_pages, cc->nr_cpages);
1494 dic->cluster_idx = cc->cluster_idx;
1495 dic->cluster_size = cc->cluster_size;
1496 dic->log_cluster_size = cc->log_cluster_size;
1497 dic->nr_cpages = cc->nr_cpages;
1498 dic->failed = false;
1499
1500 for (i = 0; i < dic->cluster_size; i++)
1501 dic->rpages[i] = cc->rpages[i];
1502 dic->nr_rpages = cc->cluster_size;
1503
1504 dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1505 if (!dic->cpages)
1506 goto out_free;
1507
1508 for (i = 0; i < dic->nr_cpages; i++) {
1509 struct page *page;
1510
1511 page = f2fs_compress_alloc_page();
1512 if (!page)
1513 goto out_free;
1514
1515 f2fs_set_compressed_page(page, cc->inode,
1516 start_idx + i + 1, dic);
1517 dic->cpages[i] = page;
1518 }
1519
1520 return dic;
1521
1522 out_free:
1523 f2fs_free_dic(dic);
1524 return ERR_PTR(-ENOMEM);
1525 }
1526
1527 void f2fs_free_dic(struct decompress_io_ctx *dic)
1528 {
1529 int i;
1530
1531 if (dic->tpages) {
1532 for (i = 0; i < dic->cluster_size; i++) {
1533 if (dic->rpages[i])
1534 continue;
1535 if (!dic->tpages[i])
1536 continue;
1537 f2fs_compress_free_page(dic->tpages[i]);
1538 }
1539 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1540 }
1541
1542 if (dic->cpages) {
1543 for (i = 0; i < dic->nr_cpages; i++) {
1544 if (!dic->cpages[i])
1545 continue;
1546 f2fs_compress_free_page(dic->cpages[i]);
1547 }
1548 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1549 }
1550
1551 page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1552 kmem_cache_free(dic_entry_slab, dic);
1553 }
1554
1555 void f2fs_decompress_end_io(struct page **rpages,
1556 unsigned int cluster_size, bool err, bool verity)
1557 {
1558 int i;
1559
1560 for (i = 0; i < cluster_size; i++) {
1561 struct page *rpage = rpages[i];
1562
1563 if (!rpage)
1564 continue;
1565
1566 if (err || PageError(rpage))
1567 goto clear_uptodate;
1568
1569 if (!verity || fsverity_verify_page(rpage)) {
1570 SetPageUptodate(rpage);
1571 goto unlock;
1572 }
1573 clear_uptodate:
1574 ClearPageUptodate(rpage);
1575 ClearPageError(rpage);
1576 unlock:
1577 unlock_page(rpage);
1578 }
1579 }
1580
1581 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1582 {
1583 dev_t dev = sbi->sb->s_bdev->bd_dev;
1584 char slab_name[32];
1585
1586 sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1587
1588 sbi->page_array_slab_size = sizeof(struct page *) <<
1589 F2FS_OPTION(sbi).compress_log_size;
1590
1591 sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1592 sbi->page_array_slab_size);
1593 if (!sbi->page_array_slab)
1594 return -ENOMEM;
1595 return 0;
1596 }
1597
1598 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1599 {
1600 kmem_cache_destroy(sbi->page_array_slab);
1601 }
1602
1603 static int __init f2fs_init_cic_cache(void)
1604 {
1605 cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1606 sizeof(struct compress_io_ctx));
1607 if (!cic_entry_slab)
1608 return -ENOMEM;
1609 return 0;
1610 }
1611
1612 static void f2fs_destroy_cic_cache(void)
1613 {
1614 kmem_cache_destroy(cic_entry_slab);
1615 }
1616
1617 static int __init f2fs_init_dic_cache(void)
1618 {
1619 dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1620 sizeof(struct decompress_io_ctx));
1621 if (!dic_entry_slab)
1622 return -ENOMEM;
1623 return 0;
1624 }
1625
1626 static void f2fs_destroy_dic_cache(void)
1627 {
1628 kmem_cache_destroy(dic_entry_slab);
1629 }
1630
1631 int __init f2fs_init_compress_cache(void)
1632 {
1633 int err;
1634
1635 err = f2fs_init_cic_cache();
1636 if (err)
1637 goto out;
1638 err = f2fs_init_dic_cache();
1639 if (err)
1640 goto free_cic;
1641 return 0;
1642 free_cic:
1643 f2fs_destroy_cic_cache();
1644 out:
1645 return -ENOMEM;
1646 }
1647
1648 void f2fs_destroy_compress_cache(void)
1649 {
1650 f2fs_destroy_dic_cache();
1651 f2fs_destroy_cic_cache();
1652 }
Linux with added FPC-III support