1 // SPDX-License-Identifier: GPL-2.0
3 * f2fs compress support
5 * Copyright (c) 2019 Chao Yu <chao@kernel.org>
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>
18 #include <trace/events/f2fs.h>
20 static struct kmem_cache *cic_entry_slab;
21 static struct kmem_cache *dic_entry_slab;
23 static void *page_array_alloc(struct inode *inode, int nr)
25 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
26 unsigned int size = sizeof(struct page *) * nr;
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);
33 static void page_array_free(struct inode *inode, void *pages, int nr)
35 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
36 unsigned int size = sizeof(struct page *) * nr;
41 if (likely(size <= sbi->page_array_slab_size))
42 kmem_cache_free(sbi->page_array_slab, pages);
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);
56 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
58 return index & (cc->cluster_size - 1);
61 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
63 return index >> cc->log_cluster_size;
66 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
68 return cc->cluster_idx << cc->log_cluster_size;
71 bool f2fs_is_compressed_page(struct page *page)
73 if (!PagePrivate(page))
75 if (!page_private(page))
77 if (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
80 * page->private may be set with pid.
81 * pid_max is enough to check if it is traced.
83 if (IS_IO_TRACED_PAGE(page))
86 f2fs_bug_on(F2FS_M_SB(page->mapping),
87 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
91 static void f2fs_set_compressed_page(struct page *page,
92 struct inode *inode, pgoff_t index, void *data)
95 set_page_private(page, (unsigned long)data);
97 /* i_crypto_info and iv index */
99 page->mapping = inode->i_mapping;
102 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
106 for (i = 0; i < len; i++) {
110 unlock_page(cc->rpages[i]);
112 put_page(cc->rpages[i]);
116 static void f2fs_put_rpages(struct compress_ctx *cc)
118 f2fs_drop_rpages(cc, cc->cluster_size, false);
121 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
123 f2fs_drop_rpages(cc, len, true);
126 static void f2fs_put_rpages_mapping(struct address_space *mapping,
127 pgoff_t start, int len)
131 for (i = 0; i < len; i++) {
132 struct page *page = find_get_page(mapping, start + i);
139 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
140 struct writeback_control *wbc, bool redirty, int unlock)
144 for (i = 0; i < cc->cluster_size; i++) {
148 redirty_page_for_writepage(wbc, cc->rpages[i]);
149 f2fs_put_page(cc->rpages[i], unlock);
153 struct page *f2fs_compress_control_page(struct page *page)
155 return ((struct compress_io_ctx *)page_private(page))->rpages[0];
158 int f2fs_init_compress_ctx(struct compress_ctx *cc)
163 cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
164 return cc->rpages ? 0 : -ENOMEM;
167 void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
169 page_array_free(cc->inode, cc->rpages, cc->cluster_size);
173 cc->cluster_idx = NULL_CLUSTER;
176 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
178 unsigned int cluster_ofs;
180 if (!f2fs_cluster_can_merge_page(cc, page->index))
181 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
183 cluster_ofs = offset_in_cluster(cc, page->index);
184 cc->rpages[cluster_ofs] = page;
186 cc->cluster_idx = cluster_idx(cc, page->index);
189 #ifdef CONFIG_F2FS_FS_LZO
190 static int lzo_init_compress_ctx(struct compress_ctx *cc)
192 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
193 LZO1X_MEM_COMPRESS, GFP_NOFS);
197 cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
201 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
207 static int lzo_compress_pages(struct compress_ctx *cc)
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);
221 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
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);
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,
238 PAGE_SIZE << dic->log_cluster_size);
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,
252 #ifdef CONFIG_F2FS_FS_LZ4
253 static int lz4_init_compress_ctx(struct compress_ctx *cc)
255 unsigned int size = LZ4_MEM_COMPRESS;
257 #ifdef CONFIG_F2FS_FS_LZ4HC
258 if (F2FS_I(cc->inode)->i_compress_flag >> COMPRESS_LEVEL_OFFSET)
259 size = LZ4HC_MEM_COMPRESS;
262 cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
267 * we do not change cc->clen to LZ4_compressBound(inputsize) to
268 * adapt worst compress case, because lz4 compressor can handle
269 * output budget properly.
271 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
275 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
281 #ifdef CONFIG_F2FS_FS_LZ4HC
282 static int lz4hc_compress_pages(struct compress_ctx *cc)
284 unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
285 COMPRESS_LEVEL_OFFSET;
289 len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
290 cc->clen, level, cc->private);
292 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
293 cc->clen, cc->private);
302 static int lz4_compress_pages(struct compress_ctx *cc)
306 #ifdef CONFIG_F2FS_FS_LZ4HC
307 return lz4hc_compress_pages(cc);
309 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
310 cc->clen, cc->private);
318 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
322 ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
323 dic->clen, dic->rlen);
325 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
326 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
330 if (ret != PAGE_SIZE << dic->log_cluster_size) {
331 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
332 "expected:%lu\n", KERN_ERR,
333 F2FS_I_SB(dic->inode)->sb->s_id,
335 PAGE_SIZE << dic->log_cluster_size);
341 static const struct f2fs_compress_ops f2fs_lz4_ops = {
342 .init_compress_ctx = lz4_init_compress_ctx,
343 .destroy_compress_ctx = lz4_destroy_compress_ctx,
344 .compress_pages = lz4_compress_pages,
345 .decompress_pages = lz4_decompress_pages,
349 #ifdef CONFIG_F2FS_FS_ZSTD
350 #define F2FS_ZSTD_DEFAULT_CLEVEL 1
352 static int zstd_init_compress_ctx(struct compress_ctx *cc)
354 ZSTD_parameters params;
355 ZSTD_CStream *stream;
357 unsigned int workspace_size;
358 unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
359 COMPRESS_LEVEL_OFFSET;
362 level = F2FS_ZSTD_DEFAULT_CLEVEL;
364 params = ZSTD_getParams(level, cc->rlen, 0);
365 workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
367 workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
368 workspace_size, GFP_NOFS);
372 stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
374 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
375 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
381 cc->private = workspace;
382 cc->private2 = stream;
384 cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
388 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
395 static int zstd_compress_pages(struct compress_ctx *cc)
397 ZSTD_CStream *stream = cc->private2;
399 ZSTD_outBuffer outbuf;
400 int src_size = cc->rlen;
401 int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
405 inbuf.src = cc->rbuf;
406 inbuf.size = src_size;
409 outbuf.dst = cc->cbuf->cdata;
410 outbuf.size = dst_size;
412 ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
413 if (ZSTD_isError(ret)) {
414 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
415 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
416 __func__, ZSTD_getErrorCode(ret));
420 ret = ZSTD_endStream(stream, &outbuf);
421 if (ZSTD_isError(ret)) {
422 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
423 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
424 __func__, ZSTD_getErrorCode(ret));
429 * there is compressed data remained in intermediate buffer due to
430 * no more space in cbuf.cdata
435 cc->clen = outbuf.pos;
439 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
441 ZSTD_DStream *stream;
443 unsigned int workspace_size;
444 unsigned int max_window_size =
445 MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
447 workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
449 workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
450 workspace_size, GFP_NOFS);
454 stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
456 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
457 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
463 dic->private = workspace;
464 dic->private2 = stream;
469 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
471 kvfree(dic->private);
473 dic->private2 = NULL;
476 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
478 ZSTD_DStream *stream = dic->private2;
480 ZSTD_outBuffer outbuf;
484 inbuf.src = dic->cbuf->cdata;
485 inbuf.size = dic->clen;
488 outbuf.dst = dic->rbuf;
489 outbuf.size = dic->rlen;
491 ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
492 if (ZSTD_isError(ret)) {
493 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
494 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
495 __func__, ZSTD_getErrorCode(ret));
499 if (dic->rlen != outbuf.pos) {
500 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
501 "expected:%lu\n", KERN_ERR,
502 F2FS_I_SB(dic->inode)->sb->s_id,
504 PAGE_SIZE << dic->log_cluster_size);
511 static const struct f2fs_compress_ops f2fs_zstd_ops = {
512 .init_compress_ctx = zstd_init_compress_ctx,
513 .destroy_compress_ctx = zstd_destroy_compress_ctx,
514 .compress_pages = zstd_compress_pages,
515 .init_decompress_ctx = zstd_init_decompress_ctx,
516 .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
517 .decompress_pages = zstd_decompress_pages,
521 #ifdef CONFIG_F2FS_FS_LZO
522 #ifdef CONFIG_F2FS_FS_LZORLE
523 static int lzorle_compress_pages(struct compress_ctx *cc)
527 ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
528 &cc->clen, cc->private);
529 if (ret != LZO_E_OK) {
530 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
531 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
537 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
538 .init_compress_ctx = lzo_init_compress_ctx,
539 .destroy_compress_ctx = lzo_destroy_compress_ctx,
540 .compress_pages = lzorle_compress_pages,
541 .decompress_pages = lzo_decompress_pages,
546 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
547 #ifdef CONFIG_F2FS_FS_LZO
552 #ifdef CONFIG_F2FS_FS_LZ4
557 #ifdef CONFIG_F2FS_FS_ZSTD
562 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
569 bool f2fs_is_compress_backend_ready(struct inode *inode)
571 if (!f2fs_compressed_file(inode))
573 return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
576 static mempool_t *compress_page_pool;
577 static int num_compress_pages = 512;
578 module_param(num_compress_pages, uint, 0444);
579 MODULE_PARM_DESC(num_compress_pages,
580 "Number of intermediate compress pages to preallocate");
582 int f2fs_init_compress_mempool(void)
584 compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
585 if (!compress_page_pool)
591 void f2fs_destroy_compress_mempool(void)
593 mempool_destroy(compress_page_pool);
596 static struct page *f2fs_compress_alloc_page(void)
600 page = mempool_alloc(compress_page_pool, GFP_NOFS);
606 static void f2fs_compress_free_page(struct page *page)
610 set_page_private(page, (unsigned long)NULL);
611 ClearPagePrivate(page);
612 page->mapping = NULL;
614 mempool_free(page, compress_page_pool);
617 #define MAX_VMAP_RETRIES 3
619 static void *f2fs_vmap(struct page **pages, unsigned int count)
624 for (i = 0; i < MAX_VMAP_RETRIES; i++) {
625 buf = vm_map_ram(pages, count, -1);
633 static int f2fs_compress_pages(struct compress_ctx *cc)
635 struct f2fs_inode_info *fi = F2FS_I(cc->inode);
636 const struct f2fs_compress_ops *cops =
637 f2fs_cops[fi->i_compress_algorithm];
638 unsigned int max_len, new_nr_cpages;
639 struct page **new_cpages;
643 trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
644 cc->cluster_size, fi->i_compress_algorithm);
646 if (cops->init_compress_ctx) {
647 ret = cops->init_compress_ctx(cc);
652 max_len = COMPRESS_HEADER_SIZE + cc->clen;
653 cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
655 cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
658 goto destroy_compress_ctx;
661 for (i = 0; i < cc->nr_cpages; i++) {
662 cc->cpages[i] = f2fs_compress_alloc_page();
663 if (!cc->cpages[i]) {
665 goto out_free_cpages;
669 cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
672 goto out_free_cpages;
675 cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
678 goto out_vunmap_rbuf;
681 ret = cops->compress_pages(cc);
683 goto out_vunmap_cbuf;
685 max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
687 if (cc->clen > max_len) {
689 goto out_vunmap_cbuf;
692 cc->cbuf->clen = cpu_to_le32(cc->clen);
694 if (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)
695 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
696 cc->cbuf->cdata, cc->clen);
697 cc->cbuf->chksum = cpu_to_le32(chksum);
699 for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
700 cc->cbuf->reserved[i] = cpu_to_le32(0);
702 new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
704 /* Now we're going to cut unnecessary tail pages */
705 new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
708 goto out_vunmap_cbuf;
711 /* zero out any unused part of the last page */
712 memset(&cc->cbuf->cdata[cc->clen], 0,
713 (new_nr_cpages * PAGE_SIZE) -
714 (cc->clen + COMPRESS_HEADER_SIZE));
716 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
717 vm_unmap_ram(cc->rbuf, cc->cluster_size);
719 for (i = 0; i < cc->nr_cpages; i++) {
720 if (i < new_nr_cpages) {
721 new_cpages[i] = cc->cpages[i];
724 f2fs_compress_free_page(cc->cpages[i]);
725 cc->cpages[i] = NULL;
728 if (cops->destroy_compress_ctx)
729 cops->destroy_compress_ctx(cc);
731 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
732 cc->cpages = new_cpages;
733 cc->nr_cpages = new_nr_cpages;
735 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
740 vm_unmap_ram(cc->cbuf, cc->nr_cpages);
742 vm_unmap_ram(cc->rbuf, cc->cluster_size);
744 for (i = 0; i < cc->nr_cpages; i++) {
746 f2fs_compress_free_page(cc->cpages[i]);
748 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
750 destroy_compress_ctx:
751 if (cops->destroy_compress_ctx)
752 cops->destroy_compress_ctx(cc);
754 trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
759 static void f2fs_decompress_cluster(struct decompress_io_ctx *dic)
761 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
762 struct f2fs_inode_info *fi = F2FS_I(dic->inode);
763 const struct f2fs_compress_ops *cops =
764 f2fs_cops[fi->i_compress_algorithm];
768 trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
769 dic->cluster_size, fi->i_compress_algorithm);
776 dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
782 for (i = 0; i < dic->cluster_size; i++) {
783 if (dic->rpages[i]) {
784 dic->tpages[i] = dic->rpages[i];
788 dic->tpages[i] = f2fs_compress_alloc_page();
789 if (!dic->tpages[i]) {
795 if (cops->init_decompress_ctx) {
796 ret = cops->init_decompress_ctx(dic);
801 dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
804 goto out_destroy_decompress_ctx;
807 dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
810 goto out_vunmap_rbuf;
813 dic->clen = le32_to_cpu(dic->cbuf->clen);
814 dic->rlen = PAGE_SIZE << dic->log_cluster_size;
816 if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
818 goto out_vunmap_cbuf;
821 ret = cops->decompress_pages(dic);
823 if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
824 u32 provided = le32_to_cpu(dic->cbuf->chksum);
825 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
827 if (provided != calculated) {
828 if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
829 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
831 "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
832 KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
833 provided, calculated);
835 set_sbi_flag(sbi, SBI_NEED_FSCK);
840 vm_unmap_ram(dic->cbuf, dic->nr_cpages);
842 vm_unmap_ram(dic->rbuf, dic->cluster_size);
843 out_destroy_decompress_ctx:
844 if (cops->destroy_decompress_ctx)
845 cops->destroy_decompress_ctx(dic);
847 trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
849 f2fs_decompress_end_io(dic, ret);
853 * This is called when a page of a compressed cluster has been read from disk
854 * (or failed to be read from disk). It checks whether this page was the last
855 * page being waited on in the cluster, and if so, it decompresses the cluster
856 * (or in the case of a failure, cleans up without actually decompressing).
858 void f2fs_end_read_compressed_page(struct page *page, bool failed)
860 struct decompress_io_ctx *dic =
861 (struct decompress_io_ctx *)page_private(page);
862 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
864 dec_page_count(sbi, F2FS_RD_DATA);
867 WRITE_ONCE(dic->failed, true);
869 if (atomic_dec_and_test(&dic->remaining_pages))
870 f2fs_decompress_cluster(dic);
873 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
875 if (cc->cluster_idx == NULL_CLUSTER)
877 return cc->cluster_idx == cluster_idx(cc, index);
880 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
882 return cc->nr_rpages == 0;
885 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
887 return cc->cluster_size == cc->nr_rpages;
890 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
892 if (f2fs_cluster_is_empty(cc))
894 return is_page_in_cluster(cc, index);
897 static bool __cluster_may_compress(struct compress_ctx *cc)
899 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
900 loff_t i_size = i_size_read(cc->inode);
901 unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
904 for (i = 0; i < cc->cluster_size; i++) {
905 struct page *page = cc->rpages[i];
907 f2fs_bug_on(sbi, !page);
909 if (unlikely(f2fs_cp_error(sbi)))
911 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
915 if (page->index >= nr_pages)
921 static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
923 struct dnode_of_data dn;
926 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
927 ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
935 if (dn.data_blkaddr == COMPRESS_ADDR) {
939 for (i = 1; i < cc->cluster_size; i++) {
942 blkaddr = data_blkaddr(dn.inode,
943 dn.node_page, dn.ofs_in_node + i);
945 if (__is_valid_data_blkaddr(blkaddr))
948 if (blkaddr != NULL_ADDR)
958 /* return # of compressed blocks in compressed cluster */
959 static int f2fs_compressed_blocks(struct compress_ctx *cc)
961 return __f2fs_cluster_blocks(cc, true);
964 /* return # of valid blocks in compressed cluster */
965 static int f2fs_cluster_blocks(struct compress_ctx *cc)
967 return __f2fs_cluster_blocks(cc, false);
970 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
972 struct compress_ctx cc = {
974 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
975 .cluster_size = F2FS_I(inode)->i_cluster_size,
976 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
979 return f2fs_cluster_blocks(&cc);
982 static bool cluster_may_compress(struct compress_ctx *cc)
984 if (!f2fs_need_compress_data(cc->inode))
986 if (f2fs_is_atomic_file(cc->inode))
988 if (f2fs_is_mmap_file(cc->inode))
990 if (!f2fs_cluster_is_full(cc))
992 if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
994 return __cluster_may_compress(cc);
997 static void set_cluster_writeback(struct compress_ctx *cc)
1001 for (i = 0; i < cc->cluster_size; i++) {
1003 set_page_writeback(cc->rpages[i]);
1007 static void set_cluster_dirty(struct compress_ctx *cc)
1011 for (i = 0; i < cc->cluster_size; i++)
1013 set_page_dirty(cc->rpages[i]);
1016 static int prepare_compress_overwrite(struct compress_ctx *cc,
1017 struct page **pagep, pgoff_t index, void **fsdata)
1019 struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1020 struct address_space *mapping = cc->inode->i_mapping;
1022 struct dnode_of_data dn;
1023 sector_t last_block_in_bio;
1024 unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1025 pgoff_t start_idx = start_idx_of_cluster(cc);
1030 ret = f2fs_cluster_blocks(cc);
1034 /* compressed case */
1035 prealloc = (ret < cc->cluster_size);
1037 ret = f2fs_init_compress_ctx(cc);
1041 /* keep page reference to avoid page reclaim */
1042 for (i = 0; i < cc->cluster_size; i++) {
1043 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1044 fgp_flag, GFP_NOFS);
1050 if (PageUptodate(page))
1053 f2fs_compress_ctx_add_page(cc, page);
1056 if (!f2fs_cluster_is_empty(cc)) {
1057 struct bio *bio = NULL;
1059 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1060 &last_block_in_bio, false, true);
1061 f2fs_destroy_compress_ctx(cc);
1065 f2fs_submit_bio(sbi, bio, DATA);
1067 ret = f2fs_init_compress_ctx(cc);
1072 for (i = 0; i < cc->cluster_size; i++) {
1073 f2fs_bug_on(sbi, cc->rpages[i]);
1075 page = find_lock_page(mapping, start_idx + i);
1076 f2fs_bug_on(sbi, !page);
1078 f2fs_wait_on_page_writeback(page, DATA, true, true);
1080 f2fs_compress_ctx_add_page(cc, page);
1081 f2fs_put_page(page, 0);
1083 if (!PageUptodate(page)) {
1084 f2fs_unlock_rpages(cc, i + 1);
1085 f2fs_put_rpages_mapping(mapping, start_idx,
1087 f2fs_destroy_compress_ctx(cc);
1093 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
1095 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1097 for (i = cc->cluster_size - 1; i > 0; i--) {
1098 ret = f2fs_get_block(&dn, start_idx + i);
1100 i = cc->cluster_size;
1104 if (dn.data_blkaddr != NEW_ADDR)
1108 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
1112 *fsdata = cc->rpages;
1113 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1114 return cc->cluster_size;
1118 f2fs_unlock_rpages(cc, i);
1120 f2fs_put_rpages_mapping(mapping, start_idx, i);
1121 f2fs_destroy_compress_ctx(cc);
1125 int f2fs_prepare_compress_overwrite(struct inode *inode,
1126 struct page **pagep, pgoff_t index, void **fsdata)
1128 struct compress_ctx cc = {
1130 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1131 .cluster_size = F2FS_I(inode)->i_cluster_size,
1132 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1137 return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1140 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1141 pgoff_t index, unsigned copied)
1144 struct compress_ctx cc = {
1146 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1147 .cluster_size = F2FS_I(inode)->i_cluster_size,
1150 bool first_index = (index == cc.rpages[0]->index);
1153 set_cluster_dirty(&cc);
1155 f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1156 f2fs_destroy_compress_ctx(&cc);
1161 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1163 void *fsdata = NULL;
1165 int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1166 pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1170 err = f2fs_is_compressed_cluster(inode, start_idx);
1174 /* truncate normal cluster */
1176 return f2fs_do_truncate_blocks(inode, from, lock);
1178 /* truncate compressed cluster */
1179 err = f2fs_prepare_compress_overwrite(inode, &pagep,
1180 start_idx, &fsdata);
1182 /* should not be a normal cluster */
1183 f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1189 struct page **rpages = fsdata;
1190 int cluster_size = F2FS_I(inode)->i_cluster_size;
1193 for (i = cluster_size - 1; i >= 0; i--) {
1194 loff_t start = rpages[i]->index << PAGE_SHIFT;
1196 if (from <= start) {
1197 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1199 zero_user_segment(rpages[i], from - start,
1205 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1210 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1212 struct writeback_control *wbc,
1213 enum iostat_type io_type)
1215 struct inode *inode = cc->inode;
1216 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1217 struct f2fs_inode_info *fi = F2FS_I(inode);
1218 struct f2fs_io_info fio = {
1220 .ino = cc->inode->i_ino,
1223 .op_flags = wbc_to_write_flags(wbc),
1224 .old_blkaddr = NEW_ADDR,
1226 .encrypted_page = NULL,
1227 .compressed_page = NULL,
1231 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1233 struct dnode_of_data dn;
1234 struct node_info ni;
1235 struct compress_io_ctx *cic;
1236 pgoff_t start_idx = start_idx_of_cluster(cc);
1237 unsigned int last_index = cc->cluster_size - 1;
1241 if (IS_NOQUOTA(inode)) {
1243 * We need to wait for node_write to avoid block allocation during
1244 * checkpoint. This can only happen to quota writes which can cause
1245 * the below discard race condition.
1247 down_read(&sbi->node_write);
1248 } else if (!f2fs_trylock_op(sbi)) {
1252 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1254 err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1258 for (i = 0; i < cc->cluster_size; i++) {
1259 if (data_blkaddr(dn.inode, dn.node_page,
1260 dn.ofs_in_node + i) == NULL_ADDR)
1264 psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1266 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1270 fio.version = ni.version;
1272 cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1276 cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1278 atomic_set(&cic->pending_pages, cc->nr_cpages);
1279 cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1283 cic->nr_rpages = cc->cluster_size;
1285 for (i = 0; i < cc->nr_cpages; i++) {
1286 f2fs_set_compressed_page(cc->cpages[i], inode,
1287 cc->rpages[i + 1]->index, cic);
1288 fio.compressed_page = cc->cpages[i];
1290 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1291 dn.ofs_in_node + i + 1);
1293 /* wait for GCed page writeback via META_MAPPING */
1294 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1296 if (fio.encrypted) {
1297 fio.page = cc->rpages[i + 1];
1298 err = f2fs_encrypt_one_page(&fio);
1300 goto out_destroy_crypt;
1301 cc->cpages[i] = fio.encrypted_page;
1305 set_cluster_writeback(cc);
1307 for (i = 0; i < cc->cluster_size; i++)
1308 cic->rpages[i] = cc->rpages[i];
1310 for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1313 blkaddr = f2fs_data_blkaddr(&dn);
1314 fio.page = cc->rpages[i];
1315 fio.old_blkaddr = blkaddr;
1317 /* cluster header */
1319 if (blkaddr == COMPRESS_ADDR)
1321 if (__is_valid_data_blkaddr(blkaddr))
1322 f2fs_invalidate_blocks(sbi, blkaddr);
1323 f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1324 goto unlock_continue;
1327 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1330 if (i > cc->nr_cpages) {
1331 if (__is_valid_data_blkaddr(blkaddr)) {
1332 f2fs_invalidate_blocks(sbi, blkaddr);
1333 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1335 goto unlock_continue;
1338 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1341 fio.encrypted_page = cc->cpages[i - 1];
1343 fio.compressed_page = cc->cpages[i - 1];
1345 cc->cpages[i - 1] = NULL;
1346 f2fs_outplace_write_data(&dn, &fio);
1349 inode_dec_dirty_pages(cc->inode);
1350 unlock_page(fio.page);
1353 if (fio.compr_blocks)
1354 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1355 f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1357 set_inode_flag(cc->inode, FI_APPEND_WRITE);
1358 if (cc->cluster_idx == 0)
1359 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1361 f2fs_put_dnode(&dn);
1362 if (IS_NOQUOTA(inode))
1363 up_read(&sbi->node_write);
1365 f2fs_unlock_op(sbi);
1367 spin_lock(&fi->i_size_lock);
1368 if (fi->last_disk_size < psize)
1369 fi->last_disk_size = psize;
1370 spin_unlock(&fi->i_size_lock);
1372 f2fs_put_rpages(cc);
1373 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1375 f2fs_destroy_compress_ctx(cc);
1379 page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1381 for (--i; i >= 0; i--)
1382 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1383 for (i = 0; i < cc->nr_cpages; i++) {
1386 f2fs_put_page(cc->cpages[i], 1);
1389 kmem_cache_free(cic_entry_slab, cic);
1391 f2fs_put_dnode(&dn);
1393 if (IS_NOQUOTA(inode))
1394 up_read(&sbi->node_write);
1396 f2fs_unlock_op(sbi);
1398 page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1403 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1405 struct f2fs_sb_info *sbi = bio->bi_private;
1406 struct compress_io_ctx *cic =
1407 (struct compress_io_ctx *)page_private(page);
1410 if (unlikely(bio->bi_status))
1411 mapping_set_error(cic->inode->i_mapping, -EIO);
1413 f2fs_compress_free_page(page);
1415 dec_page_count(sbi, F2FS_WB_DATA);
1417 if (atomic_dec_return(&cic->pending_pages))
1420 for (i = 0; i < cic->nr_rpages; i++) {
1421 WARN_ON(!cic->rpages[i]);
1422 clear_cold_data(cic->rpages[i]);
1423 end_page_writeback(cic->rpages[i]);
1426 page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1427 kmem_cache_free(cic_entry_slab, cic);
1430 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1432 struct writeback_control *wbc,
1433 enum iostat_type io_type)
1435 struct address_space *mapping = cc->inode->i_mapping;
1436 int _submitted, compr_blocks, ret;
1437 int i = -1, err = 0;
1439 compr_blocks = f2fs_compressed_blocks(cc);
1440 if (compr_blocks < 0) {
1445 for (i = 0; i < cc->cluster_size; i++) {
1449 if (cc->rpages[i]->mapping != mapping) {
1450 unlock_page(cc->rpages[i]);
1454 BUG_ON(!PageLocked(cc->rpages[i]));
1456 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1457 NULL, NULL, wbc, io_type,
1460 if (ret == AOP_WRITEPAGE_ACTIVATE) {
1461 unlock_page(cc->rpages[i]);
1463 } else if (ret == -EAGAIN) {
1465 * for quota file, just redirty left pages to
1466 * avoid deadlock caused by cluster update race
1467 * from foreground operation.
1469 if (IS_NOQUOTA(cc->inode)) {
1475 congestion_wait(BLK_RW_ASYNC,
1476 DEFAULT_IO_TIMEOUT);
1477 lock_page(cc->rpages[i]);
1479 if (!PageDirty(cc->rpages[i])) {
1480 unlock_page(cc->rpages[i]);
1484 clear_page_dirty_for_io(cc->rpages[i]);
1491 *submitted += _submitted;
1495 for (++i; i < cc->cluster_size; i++) {
1498 redirty_page_for_writepage(wbc, cc->rpages[i]);
1499 unlock_page(cc->rpages[i]);
1504 int f2fs_write_multi_pages(struct compress_ctx *cc,
1506 struct writeback_control *wbc,
1507 enum iostat_type io_type)
1512 if (cluster_may_compress(cc)) {
1513 err = f2fs_compress_pages(cc);
1514 if (err == -EAGAIN) {
1517 f2fs_put_rpages_wbc(cc, wbc, true, 1);
1521 err = f2fs_write_compressed_pages(cc, submitted,
1525 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1528 f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1530 err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1531 f2fs_put_rpages_wbc(cc, wbc, false, 0);
1533 f2fs_destroy_compress_ctx(cc);
1537 static void f2fs_free_dic(struct decompress_io_ctx *dic);
1539 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1541 struct decompress_io_ctx *dic;
1542 pgoff_t start_idx = start_idx_of_cluster(cc);
1545 dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1547 return ERR_PTR(-ENOMEM);
1549 dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1551 kmem_cache_free(dic_entry_slab, dic);
1552 return ERR_PTR(-ENOMEM);
1555 dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1556 dic->inode = cc->inode;
1557 atomic_set(&dic->remaining_pages, cc->nr_cpages);
1558 dic->cluster_idx = cc->cluster_idx;
1559 dic->cluster_size = cc->cluster_size;
1560 dic->log_cluster_size = cc->log_cluster_size;
1561 dic->nr_cpages = cc->nr_cpages;
1562 refcount_set(&dic->refcnt, 1);
1563 dic->failed = false;
1564 dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1566 for (i = 0; i < dic->cluster_size; i++)
1567 dic->rpages[i] = cc->rpages[i];
1568 dic->nr_rpages = cc->cluster_size;
1570 dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1574 for (i = 0; i < dic->nr_cpages; i++) {
1577 page = f2fs_compress_alloc_page();
1581 f2fs_set_compressed_page(page, cc->inode,
1582 start_idx + i + 1, dic);
1583 dic->cpages[i] = page;
1590 return ERR_PTR(-ENOMEM);
1593 static void f2fs_free_dic(struct decompress_io_ctx *dic)
1598 for (i = 0; i < dic->cluster_size; i++) {
1601 if (!dic->tpages[i])
1603 f2fs_compress_free_page(dic->tpages[i]);
1605 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1609 for (i = 0; i < dic->nr_cpages; i++) {
1610 if (!dic->cpages[i])
1612 f2fs_compress_free_page(dic->cpages[i]);
1614 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1617 page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1618 kmem_cache_free(dic_entry_slab, dic);
1621 static void f2fs_put_dic(struct decompress_io_ctx *dic)
1623 if (refcount_dec_and_test(&dic->refcnt))
1628 * Update and unlock the cluster's pagecache pages, and release the reference to
1629 * the decompress_io_ctx that was being held for I/O completion.
1631 static void __f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed)
1635 for (i = 0; i < dic->cluster_size; i++) {
1636 struct page *rpage = dic->rpages[i];
1641 /* PG_error was set if verity failed. */
1642 if (failed || PageError(rpage)) {
1643 ClearPageUptodate(rpage);
1644 /* will re-read again later */
1645 ClearPageError(rpage);
1647 SetPageUptodate(rpage);
1655 static void f2fs_verify_cluster(struct work_struct *work)
1657 struct decompress_io_ctx *dic =
1658 container_of(work, struct decompress_io_ctx, verity_work);
1661 /* Verify the cluster's decompressed pages with fs-verity. */
1662 for (i = 0; i < dic->cluster_size; i++) {
1663 struct page *rpage = dic->rpages[i];
1665 if (rpage && !fsverity_verify_page(rpage))
1666 SetPageError(rpage);
1669 __f2fs_decompress_end_io(dic, false);
1673 * This is called when a compressed cluster has been decompressed
1674 * (or failed to be read and/or decompressed).
1676 void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed)
1678 if (!failed && dic->need_verity) {
1680 * Note that to avoid deadlocks, the verity work can't be done
1681 * on the decompression workqueue. This is because verifying
1682 * the data pages can involve reading metadata pages from the
1683 * file, and these metadata pages may be compressed.
1685 INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1686 fsverity_enqueue_verify_work(&dic->verity_work);
1688 __f2fs_decompress_end_io(dic, failed);
1693 * Put a reference to a compressed page's decompress_io_ctx.
1695 * This is called when the page is no longer needed and can be freed.
1697 void f2fs_put_page_dic(struct page *page)
1699 struct decompress_io_ctx *dic =
1700 (struct decompress_io_ctx *)page_private(page);
1705 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1707 dev_t dev = sbi->sb->s_bdev->bd_dev;
1710 sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1712 sbi->page_array_slab_size = sizeof(struct page *) <<
1713 F2FS_OPTION(sbi).compress_log_size;
1715 sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1716 sbi->page_array_slab_size);
1717 if (!sbi->page_array_slab)
1722 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1724 kmem_cache_destroy(sbi->page_array_slab);
1727 static int __init f2fs_init_cic_cache(void)
1729 cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1730 sizeof(struct compress_io_ctx));
1731 if (!cic_entry_slab)
1736 static void f2fs_destroy_cic_cache(void)
1738 kmem_cache_destroy(cic_entry_slab);
1741 static int __init f2fs_init_dic_cache(void)
1743 dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1744 sizeof(struct decompress_io_ctx));
1745 if (!dic_entry_slab)
1750 static void f2fs_destroy_dic_cache(void)
1752 kmem_cache_destroy(dic_entry_slab);
1755 int __init f2fs_init_compress_cache(void)
1759 err = f2fs_init_cic_cache();
1762 err = f2fs_init_dic_cache();
1767 f2fs_destroy_cic_cache();
1772 void f2fs_destroy_compress_cache(void)
1774 f2fs_destroy_dic_cache();
1775 f2fs_destroy_cic_cache();