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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / fs / f2fs / compress.c
blob4bcbacfe33259201ec6c37c1080fff2b01bfe2cc
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 u32 chksum = 0;
606 int i, ret;
607
608 trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
609 cc->cluster_size, fi->i_compress_algorithm);
610
611 if (cops->init_compress_ctx) {
612 ret = cops->init_compress_ctx(cc);
613 if (ret)
614 goto out;
615 }
616
617 max_len = COMPRESS_HEADER_SIZE + cc->clen;
618 cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
619
620 cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
621 if (!cc->cpages) {
622 ret = -ENOMEM;
623 goto destroy_compress_ctx;
624 }
625
626 for (i = 0; i < cc->nr_cpages; i++) {
627 cc->cpages[i] = f2fs_compress_alloc_page();
628 if (!cc->cpages[i]) {
629 ret = -ENOMEM;
630 goto out_free_cpages;
631 }
632 }
633
634 cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
635 if (!cc->rbuf) {
636 ret = -ENOMEM;
637 goto out_free_cpages;
638 }
639
640 cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
641 if (!cc->cbuf) {
642 ret = -ENOMEM;
643 goto out_vunmap_rbuf;
644 }
645
646 ret = cops->compress_pages(cc);
647 if (ret)
648 goto out_vunmap_cbuf;
649
650 max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
651
652 if (cc->clen > max_len) {
653 ret = -EAGAIN;
654 goto out_vunmap_cbuf;
655 }
656
657 cc->cbuf->clen = cpu_to_le32(cc->clen);
658
659 if (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)
660 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
661 cc->cbuf->cdata, cc->clen);
662 cc->cbuf->chksum = cpu_to_le32(chksum);
663
664 for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
665 cc->cbuf->reserved[i] = cpu_to_le32(0);
666
667 new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
668
669 /* Now we're going to cut unnecessary tail pages */
670 new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
671 if (!new_cpages) {
672 ret = -ENOMEM;
673 goto out_vunmap_cbuf;
674 }
675
676 /* zero out any unused part of the last page */
677 memset(&cc->cbuf->cdata[cc->clen], 0,
678 (new_nr_cpages * PAGE_SIZE) -
679 (cc->clen + COMPRESS_HEADER_SIZE));
680
681 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
682 vm_unmap_ram(cc->rbuf, cc->cluster_size);
683
684 for (i = 0; i < cc->nr_cpages; i++) {
685 if (i < new_nr_cpages) {
686 new_cpages[i] = cc->cpages[i];
687 continue;
688 }
689 f2fs_compress_free_page(cc->cpages[i]);
690 cc->cpages[i] = NULL;
691 }
692
693 if (cops->destroy_compress_ctx)
694 cops->destroy_compress_ctx(cc);
695
696 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
697 cc->cpages = new_cpages;
698 cc->nr_cpages = new_nr_cpages;
699
700 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
701 cc->clen, ret);
702 return 0;
703
704 out_vunmap_cbuf:
705 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
706 out_vunmap_rbuf:
707 vm_unmap_ram(cc->rbuf, cc->cluster_size);
708 out_free_cpages:
709 for (i = 0; i < cc->nr_cpages; i++) {
710 if (cc->cpages[i])
711 f2fs_compress_free_page(cc->cpages[i]);
712 }
713 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
714 cc->cpages = NULL;
715 destroy_compress_ctx:
716 if (cops->destroy_compress_ctx)
717 cops->destroy_compress_ctx(cc);
718 out:
719 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
720 cc->clen, ret);
721 return ret;
722 }
723
724 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
725 {
726 struct decompress_io_ctx *dic =
727 (struct decompress_io_ctx *)page_private(page);
728 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
729 struct f2fs_inode_info *fi= F2FS_I(dic->inode);
730 const struct f2fs_compress_ops *cops =
731 f2fs_cops[fi->i_compress_algorithm];
732 int ret;
733 int i;
734
735 dec_page_count(sbi, F2FS_RD_DATA);
736
737 if (bio->bi_status || PageError(page))
738 dic->failed = true;
739
740 if (atomic_dec_return(&dic->pending_pages))
741 return;
742
743 trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
744 dic->cluster_size, fi->i_compress_algorithm);
745
746 /* submit partial compressed pages */
747 if (dic->failed) {
748 ret = -EIO;
749 goto out_free_dic;
750 }
751
752 dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
753 if (!dic->tpages) {
754 ret = -ENOMEM;
755 goto out_free_dic;
756 }
757
758 for (i = 0; i < dic->cluster_size; i++) {
759 if (dic->rpages[i]) {
760 dic->tpages[i] = dic->rpages[i];
761 continue;
762 }
763
764 dic->tpages[i] = f2fs_compress_alloc_page();
765 if (!dic->tpages[i]) {
766 ret = -ENOMEM;
767 goto out_free_dic;
768 }
769 }
770
771 if (cops->init_decompress_ctx) {
772 ret = cops->init_decompress_ctx(dic);
773 if (ret)
774 goto out_free_dic;
775 }
776
777 dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
778 if (!dic->rbuf) {
779 ret = -ENOMEM;
780 goto destroy_decompress_ctx;
781 }
782
783 dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
784 if (!dic->cbuf) {
785 ret = -ENOMEM;
786 goto out_vunmap_rbuf;
787 }
788
789 dic->clen = le32_to_cpu(dic->cbuf->clen);
790 dic->rlen = PAGE_SIZE << dic->log_cluster_size;
791
792 if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
793 ret = -EFSCORRUPTED;
794 goto out_vunmap_cbuf;
795 }
796
797 ret = cops->decompress_pages(dic);
798
799 if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
800 u32 provided = le32_to_cpu(dic->cbuf->chksum);
801 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
802
803 if (provided != calculated) {
804 if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
805 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
806 printk_ratelimited(
807 "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
808 KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
809 provided, calculated);
810 }
811 set_sbi_flag(sbi, SBI_NEED_FSCK);
812 }
813 }
814
815 out_vunmap_cbuf:
816 vm_unmap_ram(dic->cbuf, dic->nr_cpages);
817 out_vunmap_rbuf:
818 vm_unmap_ram(dic->rbuf, dic->cluster_size);
819 destroy_decompress_ctx:
820 if (cops->destroy_decompress_ctx)
821 cops->destroy_decompress_ctx(dic);
822 out_free_dic:
823 if (!verity)
824 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
825 ret, false);
826
827 trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
828 dic->clen, ret);
829 if (!verity)
830 f2fs_free_dic(dic);
831 }
832
833 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
834 {
835 if (cc->cluster_idx == NULL_CLUSTER)
836 return true;
837 return cc->cluster_idx == cluster_idx(cc, index);
838 }
839
840 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
841 {
842 return cc->nr_rpages == 0;
843 }
844
845 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
846 {
847 return cc->cluster_size == cc->nr_rpages;
848 }
849
850 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
851 {
852 if (f2fs_cluster_is_empty(cc))
853 return true;
854 return is_page_in_cluster(cc, index);
855 }
856
857 static bool __cluster_may_compress(struct compress_ctx *cc)
858 {
859 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
860 loff_t i_size = i_size_read(cc->inode);
861 unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
862 int i;
863
864 for (i = 0; i < cc->cluster_size; i++) {
865 struct page *page = cc->rpages[i];
866
867 f2fs_bug_on(sbi, !page);
868
869 if (unlikely(f2fs_cp_error(sbi)))
870 return false;
871 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
872 return false;
873
874 /* beyond EOF */
875 if (page->index >= nr_pages)
876 return false;
877 }
878 return true;
879 }
880
881 static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
882 {
883 struct dnode_of_data dn;
884 int ret;
885
886 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
887 ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
888 LOOKUP_NODE);
889 if (ret) {
890 if (ret == -ENOENT)
891 ret = 0;
892 goto fail;
893 }
894
895 if (dn.data_blkaddr == COMPRESS_ADDR) {
896 int i;
897
898 ret = 1;
899 for (i = 1; i < cc->cluster_size; i++) {
900 block_t blkaddr;
901
902 blkaddr = data_blkaddr(dn.inode,
903 dn.node_page, dn.ofs_in_node + i);
904 if (compr) {
905 if (__is_valid_data_blkaddr(blkaddr))
906 ret++;
907 } else {
908 if (blkaddr != NULL_ADDR)
909 ret++;
910 }
911 }
912 }
913 fail:
914 f2fs_put_dnode(&dn);
915 return ret;
916 }
917
918 /* return # of compressed blocks in compressed cluster */
919 static int f2fs_compressed_blocks(struct compress_ctx *cc)
920 {
921 return __f2fs_cluster_blocks(cc, true);
922 }
923
924 /* return # of valid blocks in compressed cluster */
925 static int f2fs_cluster_blocks(struct compress_ctx *cc)
926 {
927 return __f2fs_cluster_blocks(cc, false);
928 }
929
930 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
931 {
932 struct compress_ctx cc = {
933 .inode = inode,
934 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
935 .cluster_size = F2FS_I(inode)->i_cluster_size,
936 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
937 };
938
939 return f2fs_cluster_blocks(&cc);
940 }
941
942 static bool cluster_may_compress(struct compress_ctx *cc)
943 {
944 if (!f2fs_need_compress_data(cc->inode))
945 return false;
946 if (f2fs_is_atomic_file(cc->inode))
947 return false;
948 if (f2fs_is_mmap_file(cc->inode))
949 return false;
950 if (!f2fs_cluster_is_full(cc))
951 return false;
952 if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
953 return false;
954 return __cluster_may_compress(cc);
955 }
956
957 static void set_cluster_writeback(struct compress_ctx *cc)
958 {
959 int i;
960
961 for (i = 0; i < cc->cluster_size; i++) {
962 if (cc->rpages[i])
963 set_page_writeback(cc->rpages[i]);
964 }
965 }
966
967 static void set_cluster_dirty(struct compress_ctx *cc)
968 {
969 int i;
970
971 for (i = 0; i < cc->cluster_size; i++)
972 if (cc->rpages[i])
973 set_page_dirty(cc->rpages[i]);
974 }
975
976 static int prepare_compress_overwrite(struct compress_ctx *cc,
977 struct page **pagep, pgoff_t index, void **fsdata)
978 {
979 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
980 struct address_space *mapping = cc->inode->i_mapping;
981 struct page *page;
982 struct dnode_of_data dn;
983 sector_t last_block_in_bio;
984 unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
985 pgoff_t start_idx = start_idx_of_cluster(cc);
986 int i, ret;
987 bool prealloc;
988
989 retry:
990 ret = f2fs_cluster_blocks(cc);
991 if (ret <= 0)
992 return ret;
993
994 /* compressed case */
995 prealloc = (ret < cc->cluster_size);
996
997 ret = f2fs_init_compress_ctx(cc);
998 if (ret)
999 return ret;
1000
1001 /* keep page reference to avoid page reclaim */
1002 for (i = 0; i < cc->cluster_size; i++) {
1003 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1004 fgp_flag, GFP_NOFS);
1005 if (!page) {
1006 ret = -ENOMEM;
1007 goto unlock_pages;
1008 }
1009
1010 if (PageUptodate(page))
1011 unlock_page(page);
1012 else
1013 f2fs_compress_ctx_add_page(cc, page);
1014 }
1015
1016 if (!f2fs_cluster_is_empty(cc)) {
1017 struct bio *bio = NULL;
1018
1019 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1020 &last_block_in_bio, false, true);
1021 f2fs_destroy_compress_ctx(cc);
1022 if (ret)
1023 goto release_pages;
1024 if (bio)
1025 f2fs_submit_bio(sbi, bio, DATA);
1026
1027 ret = f2fs_init_compress_ctx(cc);
1028 if (ret)
1029 goto release_pages;
1030 }
1031
1032 for (i = 0; i < cc->cluster_size; i++) {
1033 f2fs_bug_on(sbi, cc->rpages[i]);
1034
1035 page = find_lock_page(mapping, start_idx + i);
1036 f2fs_bug_on(sbi, !page);
1037
1038 f2fs_wait_on_page_writeback(page, DATA, true, true);
1039
1040 f2fs_compress_ctx_add_page(cc, page);
1041 f2fs_put_page(page, 0);
1042
1043 if (!PageUptodate(page)) {
1044 f2fs_unlock_rpages(cc, i + 1);
1045 f2fs_put_rpages_mapping(mapping, start_idx,
1046 cc->cluster_size);
1047 f2fs_destroy_compress_ctx(cc);
1048 goto retry;
1049 }
1050 }
1051
1052 if (prealloc) {
1053 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
1054
1055 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1056
1057 for (i = cc->cluster_size - 1; i > 0; i--) {
1058 ret = f2fs_get_block(&dn, start_idx + i);
1059 if (ret) {
1060 i = cc->cluster_size;
1061 break;
1062 }
1063
1064 if (dn.data_blkaddr != NEW_ADDR)
1065 break;
1066 }
1067
1068 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
1069 }
1070
1071 if (likely(!ret)) {
1072 *fsdata = cc->rpages;
1073 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1074 return cc->cluster_size;
1075 }
1076
1077 unlock_pages:
1078 f2fs_unlock_rpages(cc, i);
1079 release_pages:
1080 f2fs_put_rpages_mapping(mapping, start_idx, i);
1081 f2fs_destroy_compress_ctx(cc);
1082 return ret;
1083 }
1084
1085 int f2fs_prepare_compress_overwrite(struct inode *inode,
1086 struct page **pagep, pgoff_t index, void **fsdata)
1087 {
1088 struct compress_ctx cc = {
1089 .inode = inode,
1090 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1091 .cluster_size = F2FS_I(inode)->i_cluster_size,
1092 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1093 .rpages = NULL,
1094 .nr_rpages = 0,
1095 };
1096
1097 return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1098 }
1099
1100 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1101 pgoff_t index, unsigned copied)
1102
1103 {
1104 struct compress_ctx cc = {
1105 .inode = inode,
1106 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1107 .cluster_size = F2FS_I(inode)->i_cluster_size,
1108 .rpages = fsdata,
1109 };
1110 bool first_index = (index == cc.rpages[0]->index);
1111
1112 if (copied)
1113 set_cluster_dirty(&cc);
1114
1115 f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1116 f2fs_destroy_compress_ctx(&cc);
1117
1118 return first_index;
1119 }
1120
1121 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1122 {
1123 void *fsdata = NULL;
1124 struct page *pagep;
1125 int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1126 pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1127 log_cluster_size;
1128 int err;
1129
1130 err = f2fs_is_compressed_cluster(inode, start_idx);
1131 if (err < 0)
1132 return err;
1133
1134 /* truncate normal cluster */
1135 if (!err)
1136 return f2fs_do_truncate_blocks(inode, from, lock);
1137
1138 /* truncate compressed cluster */
1139 err = f2fs_prepare_compress_overwrite(inode, &pagep,
1140 start_idx, &fsdata);
1141
1142 /* should not be a normal cluster */
1143 f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1144
1145 if (err <= 0)
1146 return err;
1147
1148 if (err > 0) {
1149 struct page **rpages = fsdata;
1150 int cluster_size = F2FS_I(inode)->i_cluster_size;
1151 int i;
1152
1153 for (i = cluster_size - 1; i >= 0; i--) {
1154 loff_t start = rpages[i]->index << PAGE_SHIFT;
1155
1156 if (from <= start) {
1157 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1158 } else {
1159 zero_user_segment(rpages[i], from - start,
1160 PAGE_SIZE);
1161 break;
1162 }
1163 }
1164
1165 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1166 }
1167 return 0;
1168 }
1169
1170 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1171 int *submitted,
1172 struct writeback_control *wbc,
1173 enum iostat_type io_type)
1174 {
1175 struct inode *inode = cc->inode;
1176 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1177 struct f2fs_inode_info *fi = F2FS_I(inode);
1178 struct f2fs_io_info fio = {
1179 .sbi = sbi,
1180 .ino = cc->inode->i_ino,
1181 .type = DATA,
1182 .op = REQ_OP_WRITE,
1183 .op_flags = wbc_to_write_flags(wbc),
1184 .old_blkaddr = NEW_ADDR,
1185 .page = NULL,
1186 .encrypted_page = NULL,
1187 .compressed_page = NULL,
1188 .submitted = false,
1189 .io_type = io_type,
1190 .io_wbc = wbc,
1191 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1192 };
1193 struct dnode_of_data dn;
1194 struct node_info ni;
1195 struct compress_io_ctx *cic;
1196 pgoff_t start_idx = start_idx_of_cluster(cc);
1197 unsigned int last_index = cc->cluster_size - 1;
1198 loff_t psize;
1199 int i, err;
1200
1201 if (IS_NOQUOTA(inode)) {
1202 /*
1203 * We need to wait for node_write to avoid block allocation during
1204 * checkpoint. This can only happen to quota writes which can cause
1205 * the below discard race condition.
1206 */
1207 down_read(&sbi->node_write);
1208 } else if (!f2fs_trylock_op(sbi)) {
1209 goto out_free;
1210 }
1211
1212 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1213
1214 err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1215 if (err)
1216 goto out_unlock_op;
1217
1218 for (i = 0; i < cc->cluster_size; i++) {
1219 if (data_blkaddr(dn.inode, dn.node_page,
1220 dn.ofs_in_node + i) == NULL_ADDR)
1221 goto out_put_dnode;
1222 }
1223
1224 psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1225
1226 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1227 if (err)
1228 goto out_put_dnode;
1229
1230 fio.version = ni.version;
1231
1232 cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1233 if (!cic)
1234 goto out_put_dnode;
1235
1236 cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1237 cic->inode = inode;
1238 atomic_set(&cic->pending_pages, cc->nr_cpages);
1239 cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1240 if (!cic->rpages)
1241 goto out_put_cic;
1242
1243 cic->nr_rpages = cc->cluster_size;
1244
1245 for (i = 0; i < cc->nr_cpages; i++) {
1246 f2fs_set_compressed_page(cc->cpages[i], inode,
1247 cc->rpages[i + 1]->index, cic);
1248 fio.compressed_page = cc->cpages[i];
1249
1250 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1251 dn.ofs_in_node + i + 1);
1252
1253 /* wait for GCed page writeback via META_MAPPING */
1254 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1255
1256 if (fio.encrypted) {
1257 fio.page = cc->rpages[i + 1];
1258 err = f2fs_encrypt_one_page(&fio);
1259 if (err)
1260 goto out_destroy_crypt;
1261 cc->cpages[i] = fio.encrypted_page;
1262 }
1263 }
1264
1265 set_cluster_writeback(cc);
1266
1267 for (i = 0; i < cc->cluster_size; i++)
1268 cic->rpages[i] = cc->rpages[i];
1269
1270 for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1271 block_t blkaddr;
1272
1273 blkaddr = f2fs_data_blkaddr(&dn);
1274 fio.page = cc->rpages[i];
1275 fio.old_blkaddr = blkaddr;
1276
1277 /* cluster header */
1278 if (i == 0) {
1279 if (blkaddr == COMPRESS_ADDR)
1280 fio.compr_blocks++;
1281 if (__is_valid_data_blkaddr(blkaddr))
1282 f2fs_invalidate_blocks(sbi, blkaddr);
1283 f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1284 goto unlock_continue;
1285 }
1286
1287 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1288 fio.compr_blocks++;
1289
1290 if (i > cc->nr_cpages) {
1291 if (__is_valid_data_blkaddr(blkaddr)) {
1292 f2fs_invalidate_blocks(sbi, blkaddr);
1293 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1294 }
1295 goto unlock_continue;
1296 }
1297
1298 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1299
1300 if (fio.encrypted)
1301 fio.encrypted_page = cc->cpages[i - 1];
1302 else
1303 fio.compressed_page = cc->cpages[i - 1];
1304
1305 cc->cpages[i - 1] = NULL;
1306 f2fs_outplace_write_data(&dn, &fio);
1307 (*submitted)++;
1308 unlock_continue:
1309 inode_dec_dirty_pages(cc->inode);
1310 unlock_page(fio.page);
1311 }
1312
1313 if (fio.compr_blocks)
1314 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1315 f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1316
1317 set_inode_flag(cc->inode, FI_APPEND_WRITE);
1318 if (cc->cluster_idx == 0)
1319 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1320
1321 f2fs_put_dnode(&dn);
1322 if (IS_NOQUOTA(inode))
1323 up_read(&sbi->node_write);
1324 else
1325 f2fs_unlock_op(sbi);
1326
1327 spin_lock(&fi->i_size_lock);
1328 if (fi->last_disk_size < psize)
1329 fi->last_disk_size = psize;
1330 spin_unlock(&fi->i_size_lock);
1331
1332 f2fs_put_rpages(cc);
1333 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1334 cc->cpages = NULL;
1335 f2fs_destroy_compress_ctx(cc);
1336 return 0;
1337
1338 out_destroy_crypt:
1339 page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1340
1341 for (--i; i >= 0; i--)
1342 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1343 for (i = 0; i < cc->nr_cpages; i++) {
1344 if (!cc->cpages[i])
1345 continue;
1346 f2fs_put_page(cc->cpages[i], 1);
1347 }
1348 out_put_cic:
1349 kmem_cache_free(cic_entry_slab, cic);
1350 out_put_dnode:
1351 f2fs_put_dnode(&dn);
1352 out_unlock_op:
1353 if (IS_NOQUOTA(inode))
1354 up_read(&sbi->node_write);
1355 else
1356 f2fs_unlock_op(sbi);
1357 out_free:
1358 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1359 cc->cpages = NULL;
1360 return -EAGAIN;
1361 }
1362
1363 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1364 {
1365 struct f2fs_sb_info *sbi = bio->bi_private;
1366 struct compress_io_ctx *cic =
1367 (struct compress_io_ctx *)page_private(page);
1368 int i;
1369
1370 if (unlikely(bio->bi_status))
1371 mapping_set_error(cic->inode->i_mapping, -EIO);
1372
1373 f2fs_compress_free_page(page);
1374
1375 dec_page_count(sbi, F2FS_WB_DATA);
1376
1377 if (atomic_dec_return(&cic->pending_pages))
1378 return;
1379
1380 for (i = 0; i < cic->nr_rpages; i++) {
1381 WARN_ON(!cic->rpages[i]);
1382 clear_cold_data(cic->rpages[i]);
1383 end_page_writeback(cic->rpages[i]);
1384 }
1385
1386 page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1387 kmem_cache_free(cic_entry_slab, cic);
1388 }
1389
1390 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1391 int *submitted,
1392 struct writeback_control *wbc,
1393 enum iostat_type io_type)
1394 {
1395 struct address_space *mapping = cc->inode->i_mapping;
1396 int _submitted, compr_blocks, ret;
1397 int i = -1, err = 0;
1398
1399 compr_blocks = f2fs_compressed_blocks(cc);
1400 if (compr_blocks < 0) {
1401 err = compr_blocks;
1402 goto out_err;
1403 }
1404
1405 for (i = 0; i < cc->cluster_size; i++) {
1406 if (!cc->rpages[i])
1407 continue;
1408 retry_write:
1409 if (cc->rpages[i]->mapping != mapping) {
1410 unlock_page(cc->rpages[i]);
1411 continue;
1412 }
1413
1414 BUG_ON(!PageLocked(cc->rpages[i]));
1415
1416 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1417 NULL, NULL, wbc, io_type,
1418 compr_blocks);
1419 if (ret) {
1420 if (ret == AOP_WRITEPAGE_ACTIVATE) {
1421 unlock_page(cc->rpages[i]);
1422 ret = 0;
1423 } else if (ret == -EAGAIN) {
1424 /*
1425 * for quota file, just redirty left pages to
1426 * avoid deadlock caused by cluster update race
1427 * from foreground operation.
1428 */
1429 if (IS_NOQUOTA(cc->inode)) {
1430 err = 0;
1431 goto out_err;
1432 }
1433 ret = 0;
1434 cond_resched();
1435 congestion_wait(BLK_RW_ASYNC,
1436 DEFAULT_IO_TIMEOUT);
1437 lock_page(cc->rpages[i]);
1438
1439 if (!PageDirty(cc->rpages[i])) {
1440 unlock_page(cc->rpages[i]);
1441 continue;
1442 }
1443
1444 clear_page_dirty_for_io(cc->rpages[i]);
1445 goto retry_write;
1446 }
1447 err = ret;
1448 goto out_err;
1449 }
1450
1451 *submitted += _submitted;
1452 }
1453 return 0;
1454 out_err:
1455 for (++i; i < cc->cluster_size; i++) {
1456 if (!cc->rpages[i])
1457 continue;
1458 redirty_page_for_writepage(wbc, cc->rpages[i]);
1459 unlock_page(cc->rpages[i]);
1460 }
1461 return err;
1462 }
1463
1464 int f2fs_write_multi_pages(struct compress_ctx *cc,
1465 int *submitted,
1466 struct writeback_control *wbc,
1467 enum iostat_type io_type)
1468 {
1469 int err;
1470
1471 *submitted = 0;
1472 if (cluster_may_compress(cc)) {
1473 err = f2fs_compress_pages(cc);
1474 if (err == -EAGAIN) {
1475 goto write;
1476 } else if (err) {
1477 f2fs_put_rpages_wbc(cc, wbc, true, 1);
1478 goto destroy_out;
1479 }
1480
1481 err = f2fs_write_compressed_pages(cc, submitted,
1482 wbc, io_type);
1483 if (!err)
1484 return 0;
1485 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1486 }
1487 write:
1488 f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1489
1490 err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1491 f2fs_put_rpages_wbc(cc, wbc, false, 0);
1492 destroy_out:
1493 f2fs_destroy_compress_ctx(cc);
1494 return err;
1495 }
1496
1497 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1498 {
1499 struct decompress_io_ctx *dic;
1500 pgoff_t start_idx = start_idx_of_cluster(cc);
1501 int i;
1502
1503 dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1504 if (!dic)
1505 return ERR_PTR(-ENOMEM);
1506
1507 dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1508 if (!dic->rpages) {
1509 kmem_cache_free(dic_entry_slab, dic);
1510 return ERR_PTR(-ENOMEM);
1511 }
1512
1513 dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1514 dic->inode = cc->inode;
1515 atomic_set(&dic->pending_pages, cc->nr_cpages);
1516 dic->cluster_idx = cc->cluster_idx;
1517 dic->cluster_size = cc->cluster_size;
1518 dic->log_cluster_size = cc->log_cluster_size;
1519 dic->nr_cpages = cc->nr_cpages;
1520 dic->failed = false;
1521
1522 for (i = 0; i < dic->cluster_size; i++)
1523 dic->rpages[i] = cc->rpages[i];
1524 dic->nr_rpages = cc->cluster_size;
1525
1526 dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1527 if (!dic->cpages)
1528 goto out_free;
1529
1530 for (i = 0; i < dic->nr_cpages; i++) {
1531 struct page *page;
1532
1533 page = f2fs_compress_alloc_page();
1534 if (!page)
1535 goto out_free;
1536
1537 f2fs_set_compressed_page(page, cc->inode,
1538 start_idx + i + 1, dic);
1539 dic->cpages[i] = page;
1540 }
1541
1542 return dic;
1543
1544 out_free:
1545 f2fs_free_dic(dic);
1546 return ERR_PTR(-ENOMEM);
1547 }
1548
1549 void f2fs_free_dic(struct decompress_io_ctx *dic)
1550 {
1551 int i;
1552
1553 if (dic->tpages) {
1554 for (i = 0; i < dic->cluster_size; i++) {
1555 if (dic->rpages[i])
1556 continue;
1557 if (!dic->tpages[i])
1558 continue;
1559 f2fs_compress_free_page(dic->tpages[i]);
1560 }
1561 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1562 }
1563
1564 if (dic->cpages) {
1565 for (i = 0; i < dic->nr_cpages; i++) {
1566 if (!dic->cpages[i])
1567 continue;
1568 f2fs_compress_free_page(dic->cpages[i]);
1569 }
1570 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1571 }
1572
1573 page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1574 kmem_cache_free(dic_entry_slab, dic);
1575 }
1576
1577 void f2fs_decompress_end_io(struct page **rpages,
1578 unsigned int cluster_size, bool err, bool verity)
1579 {
1580 int i;
1581
1582 for (i = 0; i < cluster_size; i++) {
1583 struct page *rpage = rpages[i];
1584
1585 if (!rpage)
1586 continue;
1587
1588 if (err || PageError(rpage))
1589 goto clear_uptodate;
1590
1591 if (!verity || fsverity_verify_page(rpage)) {
1592 SetPageUptodate(rpage);
1593 goto unlock;
1594 }
1595 clear_uptodate:
1596 ClearPageUptodate(rpage);
1597 ClearPageError(rpage);
1598 unlock:
1599 unlock_page(rpage);
1600 }
1601 }
1602
1603 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1604 {
1605 dev_t dev = sbi->sb->s_bdev->bd_dev;
1606 char slab_name[32];
1607
1608 sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1609
1610 sbi->page_array_slab_size = sizeof(struct page *) <<
1611 F2FS_OPTION(sbi).compress_log_size;
1612
1613 sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1614 sbi->page_array_slab_size);
1615 if (!sbi->page_array_slab)
1616 return -ENOMEM;
1617 return 0;
1618 }
1619
1620 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1621 {
1622 kmem_cache_destroy(sbi->page_array_slab);
1623 }
1624
1625 static int __init f2fs_init_cic_cache(void)
1626 {
1627 cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1628 sizeof(struct compress_io_ctx));
1629 if (!cic_entry_slab)
1630 return -ENOMEM;
1631 return 0;
1632 }
1633
1634 static void f2fs_destroy_cic_cache(void)
1635 {
1636 kmem_cache_destroy(cic_entry_slab);
1637 }
1638
1639 static int __init f2fs_init_dic_cache(void)
1640 {
1641 dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1642 sizeof(struct decompress_io_ctx));
1643 if (!dic_entry_slab)
1644 return -ENOMEM;
1645 return 0;
1646 }
1647
1648 static void f2fs_destroy_dic_cache(void)
1649 {
1650 kmem_cache_destroy(dic_entry_slab);
1651 }
1652
1653 int __init f2fs_init_compress_cache(void)
1654 {
1655 int err;
1656
1657 err = f2fs_init_cic_cache();
1658 if (err)
1659 goto out;
1660 err = f2fs_init_dic_cache();
1661 if (err)
1662 goto free_cic;
1663 return 0;
1664 free_cic:
1665 f2fs_destroy_cic_cache();
1666 out:
1667 return -ENOMEM;
1668 }
1669
1670 void f2fs_destroy_compress_cache(void)
1671 {
1672 f2fs_destroy_dic_cache();
1673 f2fs_destroy_cic_cache();
1674 }
Linux with added FPC-III support