Merge tag 'f2fs-for-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeu...
[linux-2.6-microblaze.git] / fs / f2fs / compress.c
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
23 static struct kmem_cache *cic_entry_slab;
24 static struct kmem_cache *dic_entry_slab;
25
26 static void *page_array_alloc(struct inode *inode, int nr)
27 {
28         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
29         unsigned int size = sizeof(struct page *) * nr;
30
31         if (likely(size <= sbi->page_array_slab_size))
32                 return f2fs_kmem_cache_alloc(sbi->page_array_slab,
33                                         GFP_F2FS_ZERO, false, F2FS_I_SB(inode));
34         return f2fs_kzalloc(sbi, size, GFP_NOFS);
35 }
36
37 static void page_array_free(struct inode *inode, void *pages, int nr)
38 {
39         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
40         unsigned int size = sizeof(struct page *) * nr;
41
42         if (!pages)
43                 return;
44
45         if (likely(size <= sbi->page_array_slab_size))
46                 kmem_cache_free(sbi->page_array_slab, pages);
47         else
48                 kfree(pages);
49 }
50
51 struct f2fs_compress_ops {
52         int (*init_compress_ctx)(struct compress_ctx *cc);
53         void (*destroy_compress_ctx)(struct compress_ctx *cc);
54         int (*compress_pages)(struct compress_ctx *cc);
55         int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
56         void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
57         int (*decompress_pages)(struct decompress_io_ctx *dic);
58 };
59
60 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
61 {
62         return index & (cc->cluster_size - 1);
63 }
64
65 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
66 {
67         return index >> cc->log_cluster_size;
68 }
69
70 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
71 {
72         return cc->cluster_idx << cc->log_cluster_size;
73 }
74
75 bool f2fs_is_compressed_page(struct page *page)
76 {
77         if (!PagePrivate(page))
78                 return false;
79         if (!page_private(page))
80                 return false;
81         if (page_private_nonpointer(page))
82                 return false;
83
84         f2fs_bug_on(F2FS_M_SB(page->mapping),
85                 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
86         return true;
87 }
88
89 static void f2fs_set_compressed_page(struct page *page,
90                 struct inode *inode, pgoff_t index, void *data)
91 {
92         attach_page_private(page, (void *)data);
93
94         /* i_crypto_info and iv index */
95         page->index = index;
96         page->mapping = inode->i_mapping;
97 }
98
99 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
100 {
101         int i;
102
103         for (i = 0; i < len; i++) {
104                 if (!cc->rpages[i])
105                         continue;
106                 if (unlock)
107                         unlock_page(cc->rpages[i]);
108                 else
109                         put_page(cc->rpages[i]);
110         }
111 }
112
113 static void f2fs_put_rpages(struct compress_ctx *cc)
114 {
115         f2fs_drop_rpages(cc, cc->cluster_size, false);
116 }
117
118 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
119 {
120         f2fs_drop_rpages(cc, len, true);
121 }
122
123 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
124                 struct writeback_control *wbc, bool redirty, int unlock)
125 {
126         unsigned int i;
127
128         for (i = 0; i < cc->cluster_size; i++) {
129                 if (!cc->rpages[i])
130                         continue;
131                 if (redirty)
132                         redirty_page_for_writepage(wbc, cc->rpages[i]);
133                 f2fs_put_page(cc->rpages[i], unlock);
134         }
135 }
136
137 struct page *f2fs_compress_control_page(struct page *page)
138 {
139         return ((struct compress_io_ctx *)page_private(page))->rpages[0];
140 }
141
142 int f2fs_init_compress_ctx(struct compress_ctx *cc)
143 {
144         if (cc->rpages)
145                 return 0;
146
147         cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
148         return cc->rpages ? 0 : -ENOMEM;
149 }
150
151 void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
152 {
153         page_array_free(cc->inode, cc->rpages, cc->cluster_size);
154         cc->rpages = NULL;
155         cc->nr_rpages = 0;
156         cc->nr_cpages = 0;
157         if (!reuse)
158                 cc->cluster_idx = NULL_CLUSTER;
159 }
160
161 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
162 {
163         unsigned int cluster_ofs;
164
165         if (!f2fs_cluster_can_merge_page(cc, page->index))
166                 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
167
168         cluster_ofs = offset_in_cluster(cc, page->index);
169         cc->rpages[cluster_ofs] = page;
170         cc->nr_rpages++;
171         cc->cluster_idx = cluster_idx(cc, page->index);
172 }
173
174 #ifdef CONFIG_F2FS_FS_LZO
175 static int lzo_init_compress_ctx(struct compress_ctx *cc)
176 {
177         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
178                                 LZO1X_MEM_COMPRESS, GFP_NOFS);
179         if (!cc->private)
180                 return -ENOMEM;
181
182         cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
183         return 0;
184 }
185
186 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
187 {
188         kvfree(cc->private);
189         cc->private = NULL;
190 }
191
192 static int lzo_compress_pages(struct compress_ctx *cc)
193 {
194         int ret;
195
196         ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
197                                         &cc->clen, cc->private);
198         if (ret != LZO_E_OK) {
199                 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
200                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
201                 return -EIO;
202         }
203         return 0;
204 }
205
206 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
207 {
208         int ret;
209
210         ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
211                                                 dic->rbuf, &dic->rlen);
212         if (ret != LZO_E_OK) {
213                 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
214                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
215                 return -EIO;
216         }
217
218         if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
219                 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
220                                         "expected:%lu\n", KERN_ERR,
221                                         F2FS_I_SB(dic->inode)->sb->s_id,
222                                         dic->rlen,
223                                         PAGE_SIZE << dic->log_cluster_size);
224                 return -EIO;
225         }
226         return 0;
227 }
228
229 static const struct f2fs_compress_ops f2fs_lzo_ops = {
230         .init_compress_ctx      = lzo_init_compress_ctx,
231         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
232         .compress_pages         = lzo_compress_pages,
233         .decompress_pages       = lzo_decompress_pages,
234 };
235 #endif
236
237 #ifdef CONFIG_F2FS_FS_LZ4
238 static int lz4_init_compress_ctx(struct compress_ctx *cc)
239 {
240         unsigned int size = LZ4_MEM_COMPRESS;
241
242 #ifdef CONFIG_F2FS_FS_LZ4HC
243         if (F2FS_I(cc->inode)->i_compress_flag >> COMPRESS_LEVEL_OFFSET)
244                 size = LZ4HC_MEM_COMPRESS;
245 #endif
246
247         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
248         if (!cc->private)
249                 return -ENOMEM;
250
251         /*
252          * we do not change cc->clen to LZ4_compressBound(inputsize) to
253          * adapt worst compress case, because lz4 compressor can handle
254          * output budget properly.
255          */
256         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
257         return 0;
258 }
259
260 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
261 {
262         kvfree(cc->private);
263         cc->private = NULL;
264 }
265
266 #ifdef CONFIG_F2FS_FS_LZ4HC
267 static int lz4hc_compress_pages(struct compress_ctx *cc)
268 {
269         unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
270                                                 COMPRESS_LEVEL_OFFSET;
271         int len;
272
273         if (level)
274                 len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
275                                         cc->clen, level, cc->private);
276         else
277                 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
278                                                 cc->clen, cc->private);
279         if (!len)
280                 return -EAGAIN;
281
282         cc->clen = len;
283         return 0;
284 }
285 #endif
286
287 static int lz4_compress_pages(struct compress_ctx *cc)
288 {
289         int len;
290
291 #ifdef CONFIG_F2FS_FS_LZ4HC
292         return lz4hc_compress_pages(cc);
293 #endif
294         len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
295                                                 cc->clen, cc->private);
296         if (!len)
297                 return -EAGAIN;
298
299         cc->clen = len;
300         return 0;
301 }
302
303 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
304 {
305         int ret;
306
307         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
308                                                 dic->clen, dic->rlen);
309         if (ret < 0) {
310                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
311                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
312                 return -EIO;
313         }
314
315         if (ret != PAGE_SIZE << dic->log_cluster_size) {
316                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
317                                         "expected:%lu\n", KERN_ERR,
318                                         F2FS_I_SB(dic->inode)->sb->s_id,
319                                         dic->rlen,
320                                         PAGE_SIZE << dic->log_cluster_size);
321                 return -EIO;
322         }
323         return 0;
324 }
325
326 static const struct f2fs_compress_ops f2fs_lz4_ops = {
327         .init_compress_ctx      = lz4_init_compress_ctx,
328         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
329         .compress_pages         = lz4_compress_pages,
330         .decompress_pages       = lz4_decompress_pages,
331 };
332 #endif
333
334 #ifdef CONFIG_F2FS_FS_ZSTD
335 #define F2FS_ZSTD_DEFAULT_CLEVEL        1
336
337 static int zstd_init_compress_ctx(struct compress_ctx *cc)
338 {
339         ZSTD_parameters params;
340         ZSTD_CStream *stream;
341         void *workspace;
342         unsigned int workspace_size;
343         unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
344                                                 COMPRESS_LEVEL_OFFSET;
345
346         if (!level)
347                 level = F2FS_ZSTD_DEFAULT_CLEVEL;
348
349         params = ZSTD_getParams(level, cc->rlen, 0);
350         workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
351
352         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
353                                         workspace_size, GFP_NOFS);
354         if (!workspace)
355                 return -ENOMEM;
356
357         stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
358         if (!stream) {
359                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
360                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
361                                 __func__);
362                 kvfree(workspace);
363                 return -EIO;
364         }
365
366         cc->private = workspace;
367         cc->private2 = stream;
368
369         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
370         return 0;
371 }
372
373 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
374 {
375         kvfree(cc->private);
376         cc->private = NULL;
377         cc->private2 = NULL;
378 }
379
380 static int zstd_compress_pages(struct compress_ctx *cc)
381 {
382         ZSTD_CStream *stream = cc->private2;
383         ZSTD_inBuffer inbuf;
384         ZSTD_outBuffer outbuf;
385         int src_size = cc->rlen;
386         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
387         int ret;
388
389         inbuf.pos = 0;
390         inbuf.src = cc->rbuf;
391         inbuf.size = src_size;
392
393         outbuf.pos = 0;
394         outbuf.dst = cc->cbuf->cdata;
395         outbuf.size = dst_size;
396
397         ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
398         if (ZSTD_isError(ret)) {
399                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
400                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
401                                 __func__, ZSTD_getErrorCode(ret));
402                 return -EIO;
403         }
404
405         ret = ZSTD_endStream(stream, &outbuf);
406         if (ZSTD_isError(ret)) {
407                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
408                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
409                                 __func__, ZSTD_getErrorCode(ret));
410                 return -EIO;
411         }
412
413         /*
414          * there is compressed data remained in intermediate buffer due to
415          * no more space in cbuf.cdata
416          */
417         if (ret)
418                 return -EAGAIN;
419
420         cc->clen = outbuf.pos;
421         return 0;
422 }
423
424 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
425 {
426         ZSTD_DStream *stream;
427         void *workspace;
428         unsigned int workspace_size;
429         unsigned int max_window_size =
430                         MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
431
432         workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
433
434         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
435                                         workspace_size, GFP_NOFS);
436         if (!workspace)
437                 return -ENOMEM;
438
439         stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
440         if (!stream) {
441                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
442                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
443                                 __func__);
444                 kvfree(workspace);
445                 return -EIO;
446         }
447
448         dic->private = workspace;
449         dic->private2 = stream;
450
451         return 0;
452 }
453
454 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
455 {
456         kvfree(dic->private);
457         dic->private = NULL;
458         dic->private2 = NULL;
459 }
460
461 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
462 {
463         ZSTD_DStream *stream = dic->private2;
464         ZSTD_inBuffer inbuf;
465         ZSTD_outBuffer outbuf;
466         int ret;
467
468         inbuf.pos = 0;
469         inbuf.src = dic->cbuf->cdata;
470         inbuf.size = dic->clen;
471
472         outbuf.pos = 0;
473         outbuf.dst = dic->rbuf;
474         outbuf.size = dic->rlen;
475
476         ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
477         if (ZSTD_isError(ret)) {
478                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
479                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
480                                 __func__, ZSTD_getErrorCode(ret));
481                 return -EIO;
482         }
483
484         if (dic->rlen != outbuf.pos) {
485                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
486                                 "expected:%lu\n", KERN_ERR,
487                                 F2FS_I_SB(dic->inode)->sb->s_id,
488                                 __func__, dic->rlen,
489                                 PAGE_SIZE << dic->log_cluster_size);
490                 return -EIO;
491         }
492
493         return 0;
494 }
495
496 static const struct f2fs_compress_ops f2fs_zstd_ops = {
497         .init_compress_ctx      = zstd_init_compress_ctx,
498         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
499         .compress_pages         = zstd_compress_pages,
500         .init_decompress_ctx    = zstd_init_decompress_ctx,
501         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
502         .decompress_pages       = zstd_decompress_pages,
503 };
504 #endif
505
506 #ifdef CONFIG_F2FS_FS_LZO
507 #ifdef CONFIG_F2FS_FS_LZORLE
508 static int lzorle_compress_pages(struct compress_ctx *cc)
509 {
510         int ret;
511
512         ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
513                                         &cc->clen, cc->private);
514         if (ret != LZO_E_OK) {
515                 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
516                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
517                 return -EIO;
518         }
519         return 0;
520 }
521
522 static 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
531 static 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
554 bool 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
561 static mempool_t *compress_page_pool;
562 static int num_compress_pages = 512;
563 module_param(num_compress_pages, uint, 0444);
564 MODULE_PARM_DESC(num_compress_pages,
565                 "Number of intermediate compress pages to preallocate");
566
567 int f2fs_init_compress_mempool(void)
568 {
569         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
570         if (!compress_page_pool)
571                 return -ENOMEM;
572
573         return 0;
574 }
575
576 void f2fs_destroy_compress_mempool(void)
577 {
578         mempool_destroy(compress_page_pool);
579 }
580
581 static struct page *f2fs_compress_alloc_page(void)
582 {
583         struct page *page;
584
585         page = mempool_alloc(compress_page_pool, GFP_NOFS);
586         lock_page(page);
587
588         return page;
589 }
590
591 static void f2fs_compress_free_page(struct page *page)
592 {
593         if (!page)
594                 return;
595         detach_page_private(page);
596         page->mapping = NULL;
597         unlock_page(page);
598         mempool_free(page, compress_page_pool);
599 }
600
601 #define MAX_VMAP_RETRIES        3
602
603 static void *f2fs_vmap(struct page **pages, unsigned int count)
604 {
605         int i;
606         void *buf = NULL;
607
608         for (i = 0; i < MAX_VMAP_RETRIES; i++) {
609                 buf = vm_map_ram(pages, count, -1);
610                 if (buf)
611                         break;
612                 vm_unmap_aliases();
613         }
614         return buf;
615 }
616
617 static int f2fs_compress_pages(struct compress_ctx *cc)
618 {
619         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
620         const struct f2fs_compress_ops *cops =
621                                 f2fs_cops[fi->i_compress_algorithm];
622         unsigned int max_len, new_nr_cpages;
623         struct page **new_cpages;
624         u32 chksum = 0;
625         int i, ret;
626
627         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
628                                 cc->cluster_size, fi->i_compress_algorithm);
629
630         if (cops->init_compress_ctx) {
631                 ret = cops->init_compress_ctx(cc);
632                 if (ret)
633                         goto out;
634         }
635
636         max_len = COMPRESS_HEADER_SIZE + cc->clen;
637         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
638
639         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
640         if (!cc->cpages) {
641                 ret = -ENOMEM;
642                 goto destroy_compress_ctx;
643         }
644
645         for (i = 0; i < cc->nr_cpages; i++) {
646                 cc->cpages[i] = f2fs_compress_alloc_page();
647                 if (!cc->cpages[i]) {
648                         ret = -ENOMEM;
649                         goto out_free_cpages;
650                 }
651         }
652
653         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
654         if (!cc->rbuf) {
655                 ret = -ENOMEM;
656                 goto out_free_cpages;
657         }
658
659         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
660         if (!cc->cbuf) {
661                 ret = -ENOMEM;
662                 goto out_vunmap_rbuf;
663         }
664
665         ret = cops->compress_pages(cc);
666         if (ret)
667                 goto out_vunmap_cbuf;
668
669         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
670
671         if (cc->clen > max_len) {
672                 ret = -EAGAIN;
673                 goto out_vunmap_cbuf;
674         }
675
676         cc->cbuf->clen = cpu_to_le32(cc->clen);
677
678         if (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)
679                 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
680                                         cc->cbuf->cdata, cc->clen);
681         cc->cbuf->chksum = cpu_to_le32(chksum);
682
683         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
684                 cc->cbuf->reserved[i] = cpu_to_le32(0);
685
686         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
687
688         /* Now we're going to cut unnecessary tail pages */
689         new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
690         if (!new_cpages) {
691                 ret = -ENOMEM;
692                 goto out_vunmap_cbuf;
693         }
694
695         /* zero out any unused part of the last page */
696         memset(&cc->cbuf->cdata[cc->clen], 0,
697                         (new_nr_cpages * PAGE_SIZE) -
698                         (cc->clen + COMPRESS_HEADER_SIZE));
699
700         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
701         vm_unmap_ram(cc->rbuf, cc->cluster_size);
702
703         for (i = 0; i < cc->nr_cpages; i++) {
704                 if (i < new_nr_cpages) {
705                         new_cpages[i] = cc->cpages[i];
706                         continue;
707                 }
708                 f2fs_compress_free_page(cc->cpages[i]);
709                 cc->cpages[i] = NULL;
710         }
711
712         if (cops->destroy_compress_ctx)
713                 cops->destroy_compress_ctx(cc);
714
715         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
716         cc->cpages = new_cpages;
717         cc->nr_cpages = new_nr_cpages;
718
719         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
720                                                         cc->clen, ret);
721         return 0;
722
723 out_vunmap_cbuf:
724         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
725 out_vunmap_rbuf:
726         vm_unmap_ram(cc->rbuf, cc->cluster_size);
727 out_free_cpages:
728         for (i = 0; i < cc->nr_cpages; i++) {
729                 if (cc->cpages[i])
730                         f2fs_compress_free_page(cc->cpages[i]);
731         }
732         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
733         cc->cpages = NULL;
734 destroy_compress_ctx:
735         if (cops->destroy_compress_ctx)
736                 cops->destroy_compress_ctx(cc);
737 out:
738         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
739                                                         cc->clen, ret);
740         return ret;
741 }
742
743 void f2fs_decompress_cluster(struct decompress_io_ctx *dic)
744 {
745         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
746         struct f2fs_inode_info *fi = F2FS_I(dic->inode);
747         const struct f2fs_compress_ops *cops =
748                         f2fs_cops[fi->i_compress_algorithm];
749         int ret;
750         int i;
751
752         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
753                                 dic->cluster_size, fi->i_compress_algorithm);
754
755         if (dic->failed) {
756                 ret = -EIO;
757                 goto out_end_io;
758         }
759
760         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
761         if (!dic->tpages) {
762                 ret = -ENOMEM;
763                 goto out_end_io;
764         }
765
766         for (i = 0; i < dic->cluster_size; i++) {
767                 if (dic->rpages[i]) {
768                         dic->tpages[i] = dic->rpages[i];
769                         continue;
770                 }
771
772                 dic->tpages[i] = f2fs_compress_alloc_page();
773                 if (!dic->tpages[i]) {
774                         ret = -ENOMEM;
775                         goto out_end_io;
776                 }
777         }
778
779         if (cops->init_decompress_ctx) {
780                 ret = cops->init_decompress_ctx(dic);
781                 if (ret)
782                         goto out_end_io;
783         }
784
785         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
786         if (!dic->rbuf) {
787                 ret = -ENOMEM;
788                 goto out_destroy_decompress_ctx;
789         }
790
791         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
792         if (!dic->cbuf) {
793                 ret = -ENOMEM;
794                 goto out_vunmap_rbuf;
795         }
796
797         dic->clen = le32_to_cpu(dic->cbuf->clen);
798         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
799
800         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
801                 ret = -EFSCORRUPTED;
802                 goto out_vunmap_cbuf;
803         }
804
805         ret = cops->decompress_pages(dic);
806
807         if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
808                 u32 provided = le32_to_cpu(dic->cbuf->chksum);
809                 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
810
811                 if (provided != calculated) {
812                         if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
813                                 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
814                                 printk_ratelimited(
815                                         "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
816                                         KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
817                                         provided, calculated);
818                         }
819                         set_sbi_flag(sbi, SBI_NEED_FSCK);
820                 }
821         }
822
823 out_vunmap_cbuf:
824         vm_unmap_ram(dic->cbuf, dic->nr_cpages);
825 out_vunmap_rbuf:
826         vm_unmap_ram(dic->rbuf, dic->cluster_size);
827 out_destroy_decompress_ctx:
828         if (cops->destroy_decompress_ctx)
829                 cops->destroy_decompress_ctx(dic);
830 out_end_io:
831         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
832                                                         dic->clen, ret);
833         f2fs_decompress_end_io(dic, ret);
834 }
835
836 /*
837  * This is called when a page of a compressed cluster has been read from disk
838  * (or failed to be read from disk).  It checks whether this page was the last
839  * page being waited on in the cluster, and if so, it decompresses the cluster
840  * (or in the case of a failure, cleans up without actually decompressing).
841  */
842 void f2fs_end_read_compressed_page(struct page *page, bool failed,
843                                                 block_t blkaddr)
844 {
845         struct decompress_io_ctx *dic =
846                         (struct decompress_io_ctx *)page_private(page);
847         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
848
849         dec_page_count(sbi, F2FS_RD_DATA);
850
851         if (failed)
852                 WRITE_ONCE(dic->failed, true);
853         else if (blkaddr)
854                 f2fs_cache_compressed_page(sbi, page,
855                                         dic->inode->i_ino, blkaddr);
856
857         if (atomic_dec_and_test(&dic->remaining_pages))
858                 f2fs_decompress_cluster(dic);
859 }
860
861 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
862 {
863         if (cc->cluster_idx == NULL_CLUSTER)
864                 return true;
865         return cc->cluster_idx == cluster_idx(cc, index);
866 }
867
868 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
869 {
870         return cc->nr_rpages == 0;
871 }
872
873 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
874 {
875         return cc->cluster_size == cc->nr_rpages;
876 }
877
878 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
879 {
880         if (f2fs_cluster_is_empty(cc))
881                 return true;
882         return is_page_in_cluster(cc, index);
883 }
884
885 bool f2fs_all_cluster_page_loaded(struct compress_ctx *cc, struct pagevec *pvec,
886                                 int index, int nr_pages)
887 {
888         unsigned long pgidx;
889         int i;
890
891         if (nr_pages - index < cc->cluster_size)
892                 return false;
893
894         pgidx = pvec->pages[index]->index;
895
896         for (i = 1; i < cc->cluster_size; i++) {
897                 if (pvec->pages[index + i]->index != pgidx + i)
898                         return false;
899         }
900
901         return true;
902 }
903
904 static bool cluster_has_invalid_data(struct compress_ctx *cc)
905 {
906         loff_t i_size = i_size_read(cc->inode);
907         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
908         int i;
909
910         for (i = 0; i < cc->cluster_size; i++) {
911                 struct page *page = cc->rpages[i];
912
913                 f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
914
915                 /* beyond EOF */
916                 if (page->index >= nr_pages)
917                         return true;
918         }
919         return false;
920 }
921
922 bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
923 {
924         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
925         unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
926         bool compressed = dn->data_blkaddr == COMPRESS_ADDR;
927         int cluster_end = 0;
928         int i;
929         char *reason = "";
930
931         if (!compressed)
932                 return false;
933
934         /* [..., COMPR_ADDR, ...] */
935         if (dn->ofs_in_node % cluster_size) {
936                 reason = "[*|C|*|*]";
937                 goto out;
938         }
939
940         for (i = 1; i < cluster_size; i++) {
941                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
942                                                         dn->ofs_in_node + i);
943
944                 /* [COMPR_ADDR, ..., COMPR_ADDR] */
945                 if (blkaddr == COMPRESS_ADDR) {
946                         reason = "[C|*|C|*]";
947                         goto out;
948                 }
949                 if (compressed) {
950                         if (!__is_valid_data_blkaddr(blkaddr)) {
951                                 if (!cluster_end)
952                                         cluster_end = i;
953                                 continue;
954                         }
955                         /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
956                         if (cluster_end) {
957                                 reason = "[C|N|N|V]";
958                                 goto out;
959                         }
960                 }
961         }
962         return false;
963 out:
964         f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
965                         dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
966         set_sbi_flag(sbi, SBI_NEED_FSCK);
967         return true;
968 }
969
970 static int __f2fs_cluster_blocks(struct inode *inode,
971                                 unsigned int cluster_idx, bool compr)
972 {
973         struct dnode_of_data dn;
974         unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
975         unsigned int start_idx = cluster_idx <<
976                                 F2FS_I(inode)->i_log_cluster_size;
977         int ret;
978
979         set_new_dnode(&dn, inode, NULL, NULL, 0);
980         ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
981         if (ret) {
982                 if (ret == -ENOENT)
983                         ret = 0;
984                 goto fail;
985         }
986
987         if (f2fs_sanity_check_cluster(&dn)) {
988                 ret = -EFSCORRUPTED;
989                 goto fail;
990         }
991
992         if (dn.data_blkaddr == COMPRESS_ADDR) {
993                 int i;
994
995                 ret = 1;
996                 for (i = 1; i < cluster_size; i++) {
997                         block_t blkaddr;
998
999                         blkaddr = data_blkaddr(dn.inode,
1000                                         dn.node_page, dn.ofs_in_node + i);
1001                         if (compr) {
1002                                 if (__is_valid_data_blkaddr(blkaddr))
1003                                         ret++;
1004                         } else {
1005                                 if (blkaddr != NULL_ADDR)
1006                                         ret++;
1007                         }
1008                 }
1009
1010                 f2fs_bug_on(F2FS_I_SB(inode),
1011                         !compr && ret != cluster_size &&
1012                         !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
1013         }
1014 fail:
1015         f2fs_put_dnode(&dn);
1016         return ret;
1017 }
1018
1019 /* return # of compressed blocks in compressed cluster */
1020 static int f2fs_compressed_blocks(struct compress_ctx *cc)
1021 {
1022         return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
1023 }
1024
1025 /* return # of valid blocks in compressed cluster */
1026 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
1027 {
1028         return __f2fs_cluster_blocks(inode,
1029                 index >> F2FS_I(inode)->i_log_cluster_size,
1030                 false);
1031 }
1032
1033 static bool cluster_may_compress(struct compress_ctx *cc)
1034 {
1035         if (!f2fs_need_compress_data(cc->inode))
1036                 return false;
1037         if (f2fs_is_atomic_file(cc->inode))
1038                 return false;
1039         if (!f2fs_cluster_is_full(cc))
1040                 return false;
1041         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
1042                 return false;
1043         return !cluster_has_invalid_data(cc);
1044 }
1045
1046 static void set_cluster_writeback(struct compress_ctx *cc)
1047 {
1048         int i;
1049
1050         for (i = 0; i < cc->cluster_size; i++) {
1051                 if (cc->rpages[i])
1052                         set_page_writeback(cc->rpages[i]);
1053         }
1054 }
1055
1056 static void set_cluster_dirty(struct compress_ctx *cc)
1057 {
1058         int i;
1059
1060         for (i = 0; i < cc->cluster_size; i++)
1061                 if (cc->rpages[i])
1062                         set_page_dirty(cc->rpages[i]);
1063 }
1064
1065 static int prepare_compress_overwrite(struct compress_ctx *cc,
1066                 struct page **pagep, pgoff_t index, void **fsdata)
1067 {
1068         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1069         struct address_space *mapping = cc->inode->i_mapping;
1070         struct page *page;
1071         sector_t last_block_in_bio;
1072         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1073         pgoff_t start_idx = start_idx_of_cluster(cc);
1074         int i, ret;
1075
1076 retry:
1077         ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
1078         if (ret <= 0)
1079                 return ret;
1080
1081         ret = f2fs_init_compress_ctx(cc);
1082         if (ret)
1083                 return ret;
1084
1085         /* keep page reference to avoid page reclaim */
1086         for (i = 0; i < cc->cluster_size; i++) {
1087                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1088                                                         fgp_flag, GFP_NOFS);
1089                 if (!page) {
1090                         ret = -ENOMEM;
1091                         goto unlock_pages;
1092                 }
1093
1094                 if (PageUptodate(page))
1095                         f2fs_put_page(page, 1);
1096                 else
1097                         f2fs_compress_ctx_add_page(cc, page);
1098         }
1099
1100         if (!f2fs_cluster_is_empty(cc)) {
1101                 struct bio *bio = NULL;
1102
1103                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1104                                         &last_block_in_bio, false, true);
1105                 f2fs_put_rpages(cc);
1106                 f2fs_destroy_compress_ctx(cc, true);
1107                 if (ret)
1108                         goto out;
1109                 if (bio)
1110                         f2fs_submit_bio(sbi, bio, DATA);
1111
1112                 ret = f2fs_init_compress_ctx(cc);
1113                 if (ret)
1114                         goto out;
1115         }
1116
1117         for (i = 0; i < cc->cluster_size; i++) {
1118                 f2fs_bug_on(sbi, cc->rpages[i]);
1119
1120                 page = find_lock_page(mapping, start_idx + i);
1121                 if (!page) {
1122                         /* page can be truncated */
1123                         goto release_and_retry;
1124                 }
1125
1126                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1127                 f2fs_compress_ctx_add_page(cc, page);
1128
1129                 if (!PageUptodate(page)) {
1130 release_and_retry:
1131                         f2fs_put_rpages(cc);
1132                         f2fs_unlock_rpages(cc, i + 1);
1133                         f2fs_destroy_compress_ctx(cc, true);
1134                         goto retry;
1135                 }
1136         }
1137
1138         if (likely(!ret)) {
1139                 *fsdata = cc->rpages;
1140                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1141                 return cc->cluster_size;
1142         }
1143
1144 unlock_pages:
1145         f2fs_put_rpages(cc);
1146         f2fs_unlock_rpages(cc, i);
1147         f2fs_destroy_compress_ctx(cc, true);
1148 out:
1149         return ret;
1150 }
1151
1152 int f2fs_prepare_compress_overwrite(struct inode *inode,
1153                 struct page **pagep, pgoff_t index, void **fsdata)
1154 {
1155         struct compress_ctx cc = {
1156                 .inode = inode,
1157                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1158                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1159                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1160                 .rpages = NULL,
1161                 .nr_rpages = 0,
1162         };
1163
1164         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1165 }
1166
1167 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1168                                         pgoff_t index, unsigned copied)
1169
1170 {
1171         struct compress_ctx cc = {
1172                 .inode = inode,
1173                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1174                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1175                 .rpages = fsdata,
1176         };
1177         bool first_index = (index == cc.rpages[0]->index);
1178
1179         if (copied)
1180                 set_cluster_dirty(&cc);
1181
1182         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1183         f2fs_destroy_compress_ctx(&cc, false);
1184
1185         return first_index;
1186 }
1187
1188 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1189 {
1190         void *fsdata = NULL;
1191         struct page *pagep;
1192         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1193         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1194                                                         log_cluster_size;
1195         int err;
1196
1197         err = f2fs_is_compressed_cluster(inode, start_idx);
1198         if (err < 0)
1199                 return err;
1200
1201         /* truncate normal cluster */
1202         if (!err)
1203                 return f2fs_do_truncate_blocks(inode, from, lock);
1204
1205         /* truncate compressed cluster */
1206         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1207                                                 start_idx, &fsdata);
1208
1209         /* should not be a normal cluster */
1210         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1211
1212         if (err <= 0)
1213                 return err;
1214
1215         if (err > 0) {
1216                 struct page **rpages = fsdata;
1217                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1218                 int i;
1219
1220                 for (i = cluster_size - 1; i >= 0; i--) {
1221                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1222
1223                         if (from <= start) {
1224                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1225                         } else {
1226                                 zero_user_segment(rpages[i], from - start,
1227                                                                 PAGE_SIZE);
1228                                 break;
1229                         }
1230                 }
1231
1232                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1233         }
1234         return 0;
1235 }
1236
1237 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1238                                         int *submitted,
1239                                         struct writeback_control *wbc,
1240                                         enum iostat_type io_type)
1241 {
1242         struct inode *inode = cc->inode;
1243         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1244         struct f2fs_inode_info *fi = F2FS_I(inode);
1245         struct f2fs_io_info fio = {
1246                 .sbi = sbi,
1247                 .ino = cc->inode->i_ino,
1248                 .type = DATA,
1249                 .op = REQ_OP_WRITE,
1250                 .op_flags = wbc_to_write_flags(wbc),
1251                 .old_blkaddr = NEW_ADDR,
1252                 .page = NULL,
1253                 .encrypted_page = NULL,
1254                 .compressed_page = NULL,
1255                 .submitted = false,
1256                 .io_type = io_type,
1257                 .io_wbc = wbc,
1258                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1259         };
1260         struct dnode_of_data dn;
1261         struct node_info ni;
1262         struct compress_io_ctx *cic;
1263         pgoff_t start_idx = start_idx_of_cluster(cc);
1264         unsigned int last_index = cc->cluster_size - 1;
1265         loff_t psize;
1266         int i, err;
1267
1268         /* we should bypass data pages to proceed the kworkder jobs */
1269         if (unlikely(f2fs_cp_error(sbi))) {
1270                 mapping_set_error(cc->rpages[0]->mapping, -EIO);
1271                 goto out_free;
1272         }
1273
1274         if (IS_NOQUOTA(inode)) {
1275                 /*
1276                  * We need to wait for node_write to avoid block allocation during
1277                  * checkpoint. This can only happen to quota writes which can cause
1278                  * the below discard race condition.
1279                  */
1280                 down_read(&sbi->node_write);
1281         } else if (!f2fs_trylock_op(sbi)) {
1282                 goto out_free;
1283         }
1284
1285         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1286
1287         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1288         if (err)
1289                 goto out_unlock_op;
1290
1291         for (i = 0; i < cc->cluster_size; i++) {
1292                 if (data_blkaddr(dn.inode, dn.node_page,
1293                                         dn.ofs_in_node + i) == NULL_ADDR)
1294                         goto out_put_dnode;
1295         }
1296
1297         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1298
1299         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1300         if (err)
1301                 goto out_put_dnode;
1302
1303         fio.version = ni.version;
1304
1305         cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1306         if (!cic)
1307                 goto out_put_dnode;
1308
1309         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1310         cic->inode = inode;
1311         atomic_set(&cic->pending_pages, cc->nr_cpages);
1312         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1313         if (!cic->rpages)
1314                 goto out_put_cic;
1315
1316         cic->nr_rpages = cc->cluster_size;
1317
1318         for (i = 0; i < cc->nr_cpages; i++) {
1319                 f2fs_set_compressed_page(cc->cpages[i], inode,
1320                                         cc->rpages[i + 1]->index, cic);
1321                 fio.compressed_page = cc->cpages[i];
1322
1323                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1324                                                 dn.ofs_in_node + i + 1);
1325
1326                 /* wait for GCed page writeback via META_MAPPING */
1327                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1328
1329                 if (fio.encrypted) {
1330                         fio.page = cc->rpages[i + 1];
1331                         err = f2fs_encrypt_one_page(&fio);
1332                         if (err)
1333                                 goto out_destroy_crypt;
1334                         cc->cpages[i] = fio.encrypted_page;
1335                 }
1336         }
1337
1338         set_cluster_writeback(cc);
1339
1340         for (i = 0; i < cc->cluster_size; i++)
1341                 cic->rpages[i] = cc->rpages[i];
1342
1343         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1344                 block_t blkaddr;
1345
1346                 blkaddr = f2fs_data_blkaddr(&dn);
1347                 fio.page = cc->rpages[i];
1348                 fio.old_blkaddr = blkaddr;
1349
1350                 /* cluster header */
1351                 if (i == 0) {
1352                         if (blkaddr == COMPRESS_ADDR)
1353                                 fio.compr_blocks++;
1354                         if (__is_valid_data_blkaddr(blkaddr))
1355                                 f2fs_invalidate_blocks(sbi, blkaddr);
1356                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1357                         goto unlock_continue;
1358                 }
1359
1360                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1361                         fio.compr_blocks++;
1362
1363                 if (i > cc->nr_cpages) {
1364                         if (__is_valid_data_blkaddr(blkaddr)) {
1365                                 f2fs_invalidate_blocks(sbi, blkaddr);
1366                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1367                         }
1368                         goto unlock_continue;
1369                 }
1370
1371                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1372
1373                 if (fio.encrypted)
1374                         fio.encrypted_page = cc->cpages[i - 1];
1375                 else
1376                         fio.compressed_page = cc->cpages[i - 1];
1377
1378                 cc->cpages[i - 1] = NULL;
1379                 f2fs_outplace_write_data(&dn, &fio);
1380                 (*submitted)++;
1381 unlock_continue:
1382                 inode_dec_dirty_pages(cc->inode);
1383                 unlock_page(fio.page);
1384         }
1385
1386         if (fio.compr_blocks)
1387                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1388         f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1389         add_compr_block_stat(inode, cc->nr_cpages);
1390
1391         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1392         if (cc->cluster_idx == 0)
1393                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1394
1395         f2fs_put_dnode(&dn);
1396         if (IS_NOQUOTA(inode))
1397                 up_read(&sbi->node_write);
1398         else
1399                 f2fs_unlock_op(sbi);
1400
1401         spin_lock(&fi->i_size_lock);
1402         if (fi->last_disk_size < psize)
1403                 fi->last_disk_size = psize;
1404         spin_unlock(&fi->i_size_lock);
1405
1406         f2fs_put_rpages(cc);
1407         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1408         cc->cpages = NULL;
1409         f2fs_destroy_compress_ctx(cc, false);
1410         return 0;
1411
1412 out_destroy_crypt:
1413         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1414
1415         for (--i; i >= 0; i--)
1416                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1417 out_put_cic:
1418         kmem_cache_free(cic_entry_slab, cic);
1419 out_put_dnode:
1420         f2fs_put_dnode(&dn);
1421 out_unlock_op:
1422         if (IS_NOQUOTA(inode))
1423                 up_read(&sbi->node_write);
1424         else
1425                 f2fs_unlock_op(sbi);
1426 out_free:
1427         for (i = 0; i < cc->nr_cpages; i++) {
1428                 if (!cc->cpages[i])
1429                         continue;
1430                 f2fs_compress_free_page(cc->cpages[i]);
1431                 cc->cpages[i] = NULL;
1432         }
1433         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1434         cc->cpages = NULL;
1435         return -EAGAIN;
1436 }
1437
1438 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1439 {
1440         struct f2fs_sb_info *sbi = bio->bi_private;
1441         struct compress_io_ctx *cic =
1442                         (struct compress_io_ctx *)page_private(page);
1443         int i;
1444
1445         if (unlikely(bio->bi_status))
1446                 mapping_set_error(cic->inode->i_mapping, -EIO);
1447
1448         f2fs_compress_free_page(page);
1449
1450         dec_page_count(sbi, F2FS_WB_DATA);
1451
1452         if (atomic_dec_return(&cic->pending_pages))
1453                 return;
1454
1455         for (i = 0; i < cic->nr_rpages; i++) {
1456                 WARN_ON(!cic->rpages[i]);
1457                 clear_page_private_gcing(cic->rpages[i]);
1458                 end_page_writeback(cic->rpages[i]);
1459         }
1460
1461         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1462         kmem_cache_free(cic_entry_slab, cic);
1463 }
1464
1465 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1466                                         int *submitted,
1467                                         struct writeback_control *wbc,
1468                                         enum iostat_type io_type)
1469 {
1470         struct address_space *mapping = cc->inode->i_mapping;
1471         int _submitted, compr_blocks, ret;
1472         int i = -1, err = 0;
1473
1474         compr_blocks = f2fs_compressed_blocks(cc);
1475         if (compr_blocks < 0) {
1476                 err = compr_blocks;
1477                 goto out_err;
1478         }
1479
1480         for (i = 0; i < cc->cluster_size; i++) {
1481                 if (!cc->rpages[i])
1482                         continue;
1483 retry_write:
1484                 if (cc->rpages[i]->mapping != mapping) {
1485                         unlock_page(cc->rpages[i]);
1486                         continue;
1487                 }
1488
1489                 BUG_ON(!PageLocked(cc->rpages[i]));
1490
1491                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1492                                                 NULL, NULL, wbc, io_type,
1493                                                 compr_blocks, false);
1494                 if (ret) {
1495                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1496                                 unlock_page(cc->rpages[i]);
1497                                 ret = 0;
1498                         } else if (ret == -EAGAIN) {
1499                                 /*
1500                                  * for quota file, just redirty left pages to
1501                                  * avoid deadlock caused by cluster update race
1502                                  * from foreground operation.
1503                                  */
1504                                 if (IS_NOQUOTA(cc->inode)) {
1505                                         err = 0;
1506                                         goto out_err;
1507                                 }
1508                                 ret = 0;
1509                                 cond_resched();
1510                                 congestion_wait(BLK_RW_ASYNC,
1511                                                 DEFAULT_IO_TIMEOUT);
1512                                 lock_page(cc->rpages[i]);
1513
1514                                 if (!PageDirty(cc->rpages[i])) {
1515                                         unlock_page(cc->rpages[i]);
1516                                         continue;
1517                                 }
1518
1519                                 clear_page_dirty_for_io(cc->rpages[i]);
1520                                 goto retry_write;
1521                         }
1522                         err = ret;
1523                         goto out_err;
1524                 }
1525
1526                 *submitted += _submitted;
1527         }
1528
1529         f2fs_balance_fs(F2FS_M_SB(mapping), true);
1530
1531         return 0;
1532 out_err:
1533         for (++i; i < cc->cluster_size; i++) {
1534                 if (!cc->rpages[i])
1535                         continue;
1536                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1537                 unlock_page(cc->rpages[i]);
1538         }
1539         return err;
1540 }
1541
1542 int f2fs_write_multi_pages(struct compress_ctx *cc,
1543                                         int *submitted,
1544                                         struct writeback_control *wbc,
1545                                         enum iostat_type io_type)
1546 {
1547         int err;
1548
1549         *submitted = 0;
1550         if (cluster_may_compress(cc)) {
1551                 err = f2fs_compress_pages(cc);
1552                 if (err == -EAGAIN) {
1553                         add_compr_block_stat(cc->inode, cc->cluster_size);
1554                         goto write;
1555                 } else if (err) {
1556                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1557                         goto destroy_out;
1558                 }
1559
1560                 err = f2fs_write_compressed_pages(cc, submitted,
1561                                                         wbc, io_type);
1562                 if (!err)
1563                         return 0;
1564                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1565         }
1566 write:
1567         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1568
1569         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1570         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1571 destroy_out:
1572         f2fs_destroy_compress_ctx(cc, false);
1573         return err;
1574 }
1575
1576 static void f2fs_free_dic(struct decompress_io_ctx *dic);
1577
1578 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1579 {
1580         struct decompress_io_ctx *dic;
1581         pgoff_t start_idx = start_idx_of_cluster(cc);
1582         int i;
1583
1584         dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO,
1585                                         false, F2FS_I_SB(cc->inode));
1586         if (!dic)
1587                 return ERR_PTR(-ENOMEM);
1588
1589         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1590         if (!dic->rpages) {
1591                 kmem_cache_free(dic_entry_slab, dic);
1592                 return ERR_PTR(-ENOMEM);
1593         }
1594
1595         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1596         dic->inode = cc->inode;
1597         atomic_set(&dic->remaining_pages, cc->nr_cpages);
1598         dic->cluster_idx = cc->cluster_idx;
1599         dic->cluster_size = cc->cluster_size;
1600         dic->log_cluster_size = cc->log_cluster_size;
1601         dic->nr_cpages = cc->nr_cpages;
1602         refcount_set(&dic->refcnt, 1);
1603         dic->failed = false;
1604         dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1605
1606         for (i = 0; i < dic->cluster_size; i++)
1607                 dic->rpages[i] = cc->rpages[i];
1608         dic->nr_rpages = cc->cluster_size;
1609
1610         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1611         if (!dic->cpages)
1612                 goto out_free;
1613
1614         for (i = 0; i < dic->nr_cpages; i++) {
1615                 struct page *page;
1616
1617                 page = f2fs_compress_alloc_page();
1618                 if (!page)
1619                         goto out_free;
1620
1621                 f2fs_set_compressed_page(page, cc->inode,
1622                                         start_idx + i + 1, dic);
1623                 dic->cpages[i] = page;
1624         }
1625
1626         return dic;
1627
1628 out_free:
1629         f2fs_free_dic(dic);
1630         return ERR_PTR(-ENOMEM);
1631 }
1632
1633 static void f2fs_free_dic(struct decompress_io_ctx *dic)
1634 {
1635         int i;
1636
1637         if (dic->tpages) {
1638                 for (i = 0; i < dic->cluster_size; i++) {
1639                         if (dic->rpages[i])
1640                                 continue;
1641                         if (!dic->tpages[i])
1642                                 continue;
1643                         f2fs_compress_free_page(dic->tpages[i]);
1644                 }
1645                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1646         }
1647
1648         if (dic->cpages) {
1649                 for (i = 0; i < dic->nr_cpages; i++) {
1650                         if (!dic->cpages[i])
1651                                 continue;
1652                         f2fs_compress_free_page(dic->cpages[i]);
1653                 }
1654                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1655         }
1656
1657         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1658         kmem_cache_free(dic_entry_slab, dic);
1659 }
1660
1661 static void f2fs_put_dic(struct decompress_io_ctx *dic)
1662 {
1663         if (refcount_dec_and_test(&dic->refcnt))
1664                 f2fs_free_dic(dic);
1665 }
1666
1667 /*
1668  * Update and unlock the cluster's pagecache pages, and release the reference to
1669  * the decompress_io_ctx that was being held for I/O completion.
1670  */
1671 static void __f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed)
1672 {
1673         int i;
1674
1675         for (i = 0; i < dic->cluster_size; i++) {
1676                 struct page *rpage = dic->rpages[i];
1677
1678                 if (!rpage)
1679                         continue;
1680
1681                 /* PG_error was set if verity failed. */
1682                 if (failed || PageError(rpage)) {
1683                         ClearPageUptodate(rpage);
1684                         /* will re-read again later */
1685                         ClearPageError(rpage);
1686                 } else {
1687                         SetPageUptodate(rpage);
1688                 }
1689                 unlock_page(rpage);
1690         }
1691
1692         f2fs_put_dic(dic);
1693 }
1694
1695 static void f2fs_verify_cluster(struct work_struct *work)
1696 {
1697         struct decompress_io_ctx *dic =
1698                 container_of(work, struct decompress_io_ctx, verity_work);
1699         int i;
1700
1701         /* Verify the cluster's decompressed pages with fs-verity. */
1702         for (i = 0; i < dic->cluster_size; i++) {
1703                 struct page *rpage = dic->rpages[i];
1704
1705                 if (rpage && !fsverity_verify_page(rpage))
1706                         SetPageError(rpage);
1707         }
1708
1709         __f2fs_decompress_end_io(dic, false);
1710 }
1711
1712 /*
1713  * This is called when a compressed cluster has been decompressed
1714  * (or failed to be read and/or decompressed).
1715  */
1716 void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed)
1717 {
1718         if (!failed && dic->need_verity) {
1719                 /*
1720                  * Note that to avoid deadlocks, the verity work can't be done
1721                  * on the decompression workqueue.  This is because verifying
1722                  * the data pages can involve reading metadata pages from the
1723                  * file, and these metadata pages may be compressed.
1724                  */
1725                 INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1726                 fsverity_enqueue_verify_work(&dic->verity_work);
1727         } else {
1728                 __f2fs_decompress_end_io(dic, failed);
1729         }
1730 }
1731
1732 /*
1733  * Put a reference to a compressed page's decompress_io_ctx.
1734  *
1735  * This is called when the page is no longer needed and can be freed.
1736  */
1737 void f2fs_put_page_dic(struct page *page)
1738 {
1739         struct decompress_io_ctx *dic =
1740                         (struct decompress_io_ctx *)page_private(page);
1741
1742         f2fs_put_dic(dic);
1743 }
1744
1745 /*
1746  * check whether cluster blocks are contiguous, and add extent cache entry
1747  * only if cluster blocks are logically and physically contiguous.
1748  */
1749 unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn)
1750 {
1751         bool compressed = f2fs_data_blkaddr(dn) == COMPRESS_ADDR;
1752         int i = compressed ? 1 : 0;
1753         block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page,
1754                                                 dn->ofs_in_node + i);
1755
1756         for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
1757                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
1758                                                 dn->ofs_in_node + i);
1759
1760                 if (!__is_valid_data_blkaddr(blkaddr))
1761                         break;
1762                 if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
1763                         return 0;
1764         }
1765
1766         return compressed ? i - 1 : i;
1767 }
1768
1769 const struct address_space_operations f2fs_compress_aops = {
1770         .releasepage = f2fs_release_page,
1771         .invalidatepage = f2fs_invalidate_page,
1772 };
1773
1774 struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1775 {
1776         return sbi->compress_inode->i_mapping;
1777 }
1778
1779 void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
1780 {
1781         if (!sbi->compress_inode)
1782                 return;
1783         invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr);
1784 }
1785
1786 void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1787                                                 nid_t ino, block_t blkaddr)
1788 {
1789         struct page *cpage;
1790         int ret;
1791
1792         if (!test_opt(sbi, COMPRESS_CACHE))
1793                 return;
1794
1795         if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1796                 return;
1797
1798         if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
1799                 return;
1800
1801         cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
1802         if (cpage) {
1803                 f2fs_put_page(cpage, 0);
1804                 return;
1805         }
1806
1807         cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
1808         if (!cpage)
1809                 return;
1810
1811         ret = add_to_page_cache_lru(cpage, COMPRESS_MAPPING(sbi),
1812                                                 blkaddr, GFP_NOFS);
1813         if (ret) {
1814                 f2fs_put_page(cpage, 0);
1815                 return;
1816         }
1817
1818         set_page_private_data(cpage, ino);
1819
1820         if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1821                 goto out;
1822
1823         memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
1824         SetPageUptodate(cpage);
1825 out:
1826         f2fs_put_page(cpage, 1);
1827 }
1828
1829 bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1830                                                                 block_t blkaddr)
1831 {
1832         struct page *cpage;
1833         bool hitted = false;
1834
1835         if (!test_opt(sbi, COMPRESS_CACHE))
1836                 return false;
1837
1838         cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
1839                                 blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1840         if (cpage) {
1841                 if (PageUptodate(cpage)) {
1842                         atomic_inc(&sbi->compress_page_hit);
1843                         memcpy(page_address(page),
1844                                 page_address(cpage), PAGE_SIZE);
1845                         hitted = true;
1846                 }
1847                 f2fs_put_page(cpage, 1);
1848         }
1849
1850         return hitted;
1851 }
1852
1853 void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1854 {
1855         struct address_space *mapping = sbi->compress_inode->i_mapping;
1856         struct pagevec pvec;
1857         pgoff_t index = 0;
1858         pgoff_t end = MAX_BLKADDR(sbi);
1859
1860         if (!mapping->nrpages)
1861                 return;
1862
1863         pagevec_init(&pvec);
1864
1865         do {
1866                 unsigned int nr_pages;
1867                 int i;
1868
1869                 nr_pages = pagevec_lookup_range(&pvec, mapping,
1870                                                 &index, end - 1);
1871                 if (!nr_pages)
1872                         break;
1873
1874                 for (i = 0; i < nr_pages; i++) {
1875                         struct page *page = pvec.pages[i];
1876
1877                         if (page->index > end)
1878                                 break;
1879
1880                         lock_page(page);
1881                         if (page->mapping != mapping) {
1882                                 unlock_page(page);
1883                                 continue;
1884                         }
1885
1886                         if (ino != get_page_private_data(page)) {
1887                                 unlock_page(page);
1888                                 continue;
1889                         }
1890
1891                         generic_error_remove_page(mapping, page);
1892                         unlock_page(page);
1893                 }
1894                 pagevec_release(&pvec);
1895                 cond_resched();
1896         } while (index < end);
1897 }
1898
1899 int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
1900 {
1901         struct inode *inode;
1902
1903         if (!test_opt(sbi, COMPRESS_CACHE))
1904                 return 0;
1905
1906         inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
1907         if (IS_ERR(inode))
1908                 return PTR_ERR(inode);
1909         sbi->compress_inode = inode;
1910
1911         sbi->compress_percent = COMPRESS_PERCENT;
1912         sbi->compress_watermark = COMPRESS_WATERMARK;
1913
1914         atomic_set(&sbi->compress_page_hit, 0);
1915
1916         return 0;
1917 }
1918
1919 void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
1920 {
1921         if (!sbi->compress_inode)
1922                 return;
1923         iput(sbi->compress_inode);
1924         sbi->compress_inode = NULL;
1925 }
1926
1927 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1928 {
1929         dev_t dev = sbi->sb->s_bdev->bd_dev;
1930         char slab_name[32];
1931
1932         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1933
1934         sbi->page_array_slab_size = sizeof(struct page *) <<
1935                                         F2FS_OPTION(sbi).compress_log_size;
1936
1937         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1938                                         sbi->page_array_slab_size);
1939         if (!sbi->page_array_slab)
1940                 return -ENOMEM;
1941         return 0;
1942 }
1943
1944 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1945 {
1946         kmem_cache_destroy(sbi->page_array_slab);
1947 }
1948
1949 static int __init f2fs_init_cic_cache(void)
1950 {
1951         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1952                                         sizeof(struct compress_io_ctx));
1953         if (!cic_entry_slab)
1954                 return -ENOMEM;
1955         return 0;
1956 }
1957
1958 static void f2fs_destroy_cic_cache(void)
1959 {
1960         kmem_cache_destroy(cic_entry_slab);
1961 }
1962
1963 static int __init f2fs_init_dic_cache(void)
1964 {
1965         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1966                                         sizeof(struct decompress_io_ctx));
1967         if (!dic_entry_slab)
1968                 return -ENOMEM;
1969         return 0;
1970 }
1971
1972 static void f2fs_destroy_dic_cache(void)
1973 {
1974         kmem_cache_destroy(dic_entry_slab);
1975 }
1976
1977 int __init f2fs_init_compress_cache(void)
1978 {
1979         int err;
1980
1981         err = f2fs_init_cic_cache();
1982         if (err)
1983                 goto out;
1984         err = f2fs_init_dic_cache();
1985         if (err)
1986                 goto free_cic;
1987         return 0;
1988 free_cic:
1989         f2fs_destroy_cic_cache();
1990 out:
1991         return -ENOMEM;
1992 }
1993
1994 void f2fs_destroy_compress_cache(void)
1995 {
1996         f2fs_destroy_dic_cache();
1997         f2fs_destroy_cic_cache();
1998 }