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
  23static struct kmem_cache *cic_entry_slab;
  24static struct kmem_cache *dic_entry_slab;
  25
  26static void *page_array_alloc(struct f2fs_sb_info *sbi, int nr)
  27{
  28	unsigned int size = sizeof(struct page *) * nr;
  29
  30	if (likely(size <= sbi->page_array_slab_size))
  31		return f2fs_kmem_cache_alloc(sbi->page_array_slab,
  32					GFP_F2FS_ZERO, false, sbi);
  33	return f2fs_kzalloc(sbi, size, GFP_NOFS);
  34}
  35
  36static void page_array_free(struct f2fs_sb_info *sbi, void *pages, int nr)
  37{
  38	unsigned int size = sizeof(struct page *) * nr;
  39
  40	if (!pages)
  41		return;
  42
  43	if (likely(size <= sbi->page_array_slab_size))
  44		kmem_cache_free(sbi->page_array_slab, pages);
  45	else
  46		kfree(pages);
  47}
  48
  49struct f2fs_compress_ops {
  50	int (*init_compress_ctx)(struct compress_ctx *cc);
  51	void (*destroy_compress_ctx)(struct compress_ctx *cc);
  52	int (*compress_pages)(struct compress_ctx *cc);
  53	int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
  54	void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
  55	int (*decompress_pages)(struct decompress_io_ctx *dic);
  56	bool (*is_level_valid)(int level);
  57};
  58
  59static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
  60{
  61	return index & (cc->cluster_size - 1);
  62}
  63
  64static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
  65{
  66	return index >> cc->log_cluster_size;
  67}
  68
  69static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
  70{
  71	return cc->cluster_idx << cc->log_cluster_size;
  72}
  73
  74bool f2fs_is_compressed_page(struct folio *folio)
  75{
  76	if (!folio->private)
  77		return false;
  78	if (folio_test_f2fs_nonpointer(folio))
  79		return false;
  80
  81	f2fs_bug_on(F2FS_F_SB(folio),
  82		*((u32 *)folio->private) != F2FS_COMPRESSED_PAGE_MAGIC);
  83	return true;
  84}
  85
  86static void f2fs_set_compressed_page(struct page *page,
  87		struct inode *inode, pgoff_t index, void *data)
  88{
  89	struct folio *folio = page_folio(page);
  90
  91	folio_attach_private(folio, (void *)data);
  92
  93	/* i_crypto_info and iv index */
  94	folio->index = index;
  95	folio->mapping = inode->i_mapping;
  96}
  97
  98static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
  99{
 100	int i;
 101
 102	for (i = 0; i < len; i++) {
 103		if (!cc->rpages[i])
 104			continue;
 105		if (unlock)
 106			unlock_page(cc->rpages[i]);
 107		else
 108			put_page(cc->rpages[i]);
 109	}
 110}
 111
 112static void f2fs_put_rpages(struct compress_ctx *cc)
 113{
 114	f2fs_drop_rpages(cc, cc->cluster_size, false);
 115}
 116
 117static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
 118{
 119	f2fs_drop_rpages(cc, len, true);
 120}
 121
 122static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 123		struct writeback_control *wbc, bool redirty, bool unlock)
 124{
 125	unsigned int i;
 126
 127	for (i = 0; i < cc->cluster_size; i++) {
 128		if (!cc->rpages[i])
 129			continue;
 130		if (redirty)
 131			redirty_page_for_writepage(wbc, cc->rpages[i]);
 132		f2fs_put_page(cc->rpages[i], unlock);
 133	}
 134}
 135
 136struct folio *f2fs_compress_control_folio(struct folio *folio)
 137{
 138	struct compress_io_ctx *ctx = folio->private;
 139
 140	return page_folio(ctx->rpages[0]);
 141}
 142
 143int f2fs_init_compress_ctx(struct compress_ctx *cc)
 144{
 145	if (cc->rpages)
 146		return 0;
 147
 148	cc->rpages = page_array_alloc(F2FS_I_SB(cc->inode), cc->cluster_size);
 149	return cc->rpages ? 0 : -ENOMEM;
 150}
 151
 152void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
 153{
 154	page_array_free(F2FS_I_SB(cc->inode), cc->rpages, cc->cluster_size);
 155	cc->rpages = NULL;
 156	cc->nr_rpages = 0;
 157	cc->nr_cpages = 0;
 158	cc->valid_nr_cpages = 0;
 159	if (!reuse)
 160		cc->cluster_idx = NULL_CLUSTER;
 161}
 162
 163void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct folio *folio)
 164{
 165	unsigned int cluster_ofs;
 166
 167	if (!f2fs_cluster_can_merge_page(cc, folio->index))
 168		f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 169
 170	cluster_ofs = offset_in_cluster(cc, folio->index);
 171	cc->rpages[cluster_ofs] = folio_page(folio, 0);
 172	cc->nr_rpages++;
 173	cc->cluster_idx = cluster_idx(cc, folio->index);
 174}
 175
 176#ifdef CONFIG_F2FS_FS_LZO
 177static int lzo_init_compress_ctx(struct compress_ctx *cc)
 178{
 179	cc->private = f2fs_vmalloc(F2FS_I_SB(cc->inode),
 180					LZO1X_MEM_COMPRESS);
 181	if (!cc->private)
 182		return -ENOMEM;
 183
 184	cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 185	return 0;
 186}
 187
 188static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 189{
 190	vfree(cc->private);
 191	cc->private = NULL;
 192}
 193
 194static int lzo_compress_pages(struct compress_ctx *cc)
 195{
 196	int ret;
 197
 198	ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 199					&cc->clen, cc->private);
 200	if (ret != LZO_E_OK) {
 201		f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
 202				"lzo compress failed, ret:%d", ret);
 203		return -EIO;
 204	}
 205	return 0;
 206}
 207
 208static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 209{
 210	int ret;
 211
 212	ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 213						dic->rbuf, &dic->rlen);
 214	if (ret != LZO_E_OK) {
 215		f2fs_err_ratelimited(dic->sbi,
 216				"lzo decompress failed, ret:%d", ret);
 217		return -EIO;
 218	}
 219
 220	if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 221		f2fs_err_ratelimited(dic->sbi,
 222				"lzo invalid rlen:%zu, expected:%lu",
 223				dic->rlen, PAGE_SIZE << dic->log_cluster_size);
 224		return -EIO;
 225	}
 226	return 0;
 227}
 228
 229static 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
 238static 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_level)
 244		size = LZ4HC_MEM_COMPRESS;
 245#endif
 246
 247	cc->private = f2fs_vmalloc(F2FS_I_SB(cc->inode), size);
 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
 260static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 261{
 262	vfree(cc->private);
 263	cc->private = NULL;
 264}
 265
 266static int lz4_compress_pages(struct compress_ctx *cc)
 267{
 268	int len = -EINVAL;
 269	unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 270
 271	if (!level)
 272		len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 273						cc->clen, cc->private);
 274#ifdef CONFIG_F2FS_FS_LZ4HC
 275	else
 276		len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 277					cc->clen, level, cc->private);
 278#endif
 279	if (len < 0)
 280		return len;
 281	if (!len)
 282		return -EAGAIN;
 283
 284	cc->clen = len;
 285	return 0;
 286}
 287
 288static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 289{
 290	int ret;
 291
 292	ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 293						dic->clen, dic->rlen);
 294	if (ret < 0) {
 295		f2fs_err_ratelimited(dic->sbi,
 296				"lz4 decompress failed, ret:%d", ret);
 297		return -EIO;
 298	}
 299
 300	if (ret != PAGE_SIZE << dic->log_cluster_size) {
 301		f2fs_err_ratelimited(dic->sbi,
 302				"lz4 invalid ret:%d, expected:%lu",
 303				ret, PAGE_SIZE << dic->log_cluster_size);
 304		return -EIO;
 305	}
 306	return 0;
 307}
 308
 309static bool lz4_is_level_valid(int lvl)
 310{
 311#ifdef CONFIG_F2FS_FS_LZ4HC
 312	return !lvl || (lvl >= LZ4HC_MIN_CLEVEL && lvl <= LZ4HC_MAX_CLEVEL);
 313#else
 314	return lvl == 0;
 315#endif
 316}
 317
 318static const struct f2fs_compress_ops f2fs_lz4_ops = {
 319	.init_compress_ctx	= lz4_init_compress_ctx,
 320	.destroy_compress_ctx	= lz4_destroy_compress_ctx,
 321	.compress_pages		= lz4_compress_pages,
 322	.decompress_pages	= lz4_decompress_pages,
 323	.is_level_valid		= lz4_is_level_valid,
 324};
 325#endif
 326
 327#ifdef CONFIG_F2FS_FS_ZSTD
 328static int zstd_init_compress_ctx(struct compress_ctx *cc)
 329{
 330	zstd_parameters params;
 331	zstd_cstream *stream;
 332	void *workspace;
 333	unsigned int workspace_size;
 334	unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 335
 336	/* Need to remain this for backward compatibility */
 337	if (!level)
 338		level = F2FS_ZSTD_DEFAULT_CLEVEL;
 339
 340	params = zstd_get_params(level, cc->rlen);
 341	workspace_size = zstd_cstream_workspace_bound(&params.cParams);
 342
 343	workspace = f2fs_vmalloc(F2FS_I_SB(cc->inode), workspace_size);
 344	if (!workspace)
 345		return -ENOMEM;
 346
 347	stream = zstd_init_cstream(&params, 0, workspace, workspace_size);
 348	if (!stream) {
 349		f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
 350				"%s zstd_init_cstream failed", __func__);
 351		vfree(workspace);
 352		return -EIO;
 353	}
 354
 355	cc->private = workspace;
 356	cc->private2 = stream;
 357
 358	cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 359	return 0;
 360}
 361
 362static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 363{
 364	vfree(cc->private);
 365	cc->private = NULL;
 366	cc->private2 = NULL;
 367}
 368
 369static int zstd_compress_pages(struct compress_ctx *cc)
 370{
 371	zstd_cstream *stream = cc->private2;
 372	zstd_in_buffer inbuf;
 373	zstd_out_buffer outbuf;
 374	int src_size = cc->rlen;
 375	int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 376	int ret;
 377
 378	inbuf.pos = 0;
 379	inbuf.src = cc->rbuf;
 380	inbuf.size = src_size;
 381
 382	outbuf.pos = 0;
 383	outbuf.dst = cc->cbuf->cdata;
 384	outbuf.size = dst_size;
 385
 386	ret = zstd_compress_stream(stream, &outbuf, &inbuf);
 387	if (zstd_is_error(ret)) {
 388		f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
 389				"%s zstd_compress_stream failed, ret: %d",
 390				__func__, zstd_get_error_code(ret));
 391		return -EIO;
 392	}
 393
 394	ret = zstd_end_stream(stream, &outbuf);
 395	if (zstd_is_error(ret)) {
 396		f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
 397				"%s zstd_end_stream returned %d",
 398				__func__, zstd_get_error_code(ret));
 399		return -EIO;
 400	}
 401
 402	/*
 403	 * there is compressed data remained in intermediate buffer due to
 404	 * no more space in cbuf.cdata
 405	 */
 406	if (ret)
 407		return -EAGAIN;
 408
 409	cc->clen = outbuf.pos;
 410	return 0;
 411}
 412
 413static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 414{
 415	zstd_dstream *stream;
 416	void *workspace;
 417	unsigned int workspace_size;
 418	unsigned int max_window_size =
 419			MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 420
 421	workspace_size = zstd_dstream_workspace_bound(max_window_size);
 422
 423	workspace = f2fs_vmalloc(dic->sbi, workspace_size);
 424	if (!workspace)
 425		return -ENOMEM;
 426
 427	stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
 428	if (!stream) {
 429		f2fs_err_ratelimited(dic->sbi,
 430				"%s zstd_init_dstream failed", __func__);
 431		vfree(workspace);
 432		return -EIO;
 433	}
 434
 435	dic->private = workspace;
 436	dic->private2 = stream;
 437
 438	return 0;
 439}
 440
 441static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 442{
 443	vfree(dic->private);
 444	dic->private = NULL;
 445	dic->private2 = NULL;
 446}
 447
 448static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 449{
 450	zstd_dstream *stream = dic->private2;
 451	zstd_in_buffer inbuf;
 452	zstd_out_buffer outbuf;
 453	int ret;
 454
 455	inbuf.pos = 0;
 456	inbuf.src = dic->cbuf->cdata;
 457	inbuf.size = dic->clen;
 458
 459	outbuf.pos = 0;
 460	outbuf.dst = dic->rbuf;
 461	outbuf.size = dic->rlen;
 462
 463	ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
 464	if (zstd_is_error(ret)) {
 465		f2fs_err_ratelimited(dic->sbi,
 466				"%s zstd_decompress_stream failed, ret: %d",
 467				__func__, zstd_get_error_code(ret));
 468		return -EIO;
 469	}
 470
 471	if (dic->rlen != outbuf.pos) {
 472		f2fs_err_ratelimited(dic->sbi,
 473				"%s ZSTD invalid rlen:%zu, expected:%lu",
 474				__func__, dic->rlen,
 475				PAGE_SIZE << dic->log_cluster_size);
 476		return -EIO;
 477	}
 478
 479	return 0;
 480}
 481
 482static bool zstd_is_level_valid(int lvl)
 483{
 484	return lvl >= zstd_min_clevel() && lvl <= zstd_max_clevel();
 485}
 486
 487static const struct f2fs_compress_ops f2fs_zstd_ops = {
 488	.init_compress_ctx	= zstd_init_compress_ctx,
 489	.destroy_compress_ctx	= zstd_destroy_compress_ctx,
 490	.compress_pages		= zstd_compress_pages,
 491	.init_decompress_ctx	= zstd_init_decompress_ctx,
 492	.destroy_decompress_ctx	= zstd_destroy_decompress_ctx,
 493	.decompress_pages	= zstd_decompress_pages,
 494	.is_level_valid		= zstd_is_level_valid,
 495};
 496#endif
 497
 498#ifdef CONFIG_F2FS_FS_LZO
 499#ifdef CONFIG_F2FS_FS_LZORLE
 500static int lzorle_compress_pages(struct compress_ctx *cc)
 501{
 502	int ret;
 503
 504	ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 505					&cc->clen, cc->private);
 506	if (ret != LZO_E_OK) {
 507		f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
 508				"lzo-rle compress failed, ret:%d", ret);
 509		return -EIO;
 510	}
 511	return 0;
 512}
 513
 514static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 515	.init_compress_ctx	= lzo_init_compress_ctx,
 516	.destroy_compress_ctx	= lzo_destroy_compress_ctx,
 517	.compress_pages		= lzorle_compress_pages,
 518	.decompress_pages	= lzo_decompress_pages,
 519};
 520#endif
 521#endif
 522
 523static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 524#ifdef CONFIG_F2FS_FS_LZO
 525	&f2fs_lzo_ops,
 526#else
 527	NULL,
 528#endif
 529#ifdef CONFIG_F2FS_FS_LZ4
 530	&f2fs_lz4_ops,
 531#else
 532	NULL,
 533#endif
 534#ifdef CONFIG_F2FS_FS_ZSTD
 535	&f2fs_zstd_ops,
 536#else
 537	NULL,
 538#endif
 539#if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 540	&f2fs_lzorle_ops,
 541#else
 542	NULL,
 543#endif
 544};
 545
 546bool f2fs_is_compress_backend_ready(struct inode *inode)
 547{
 548	if (!f2fs_compressed_file(inode))
 549		return true;
 550	return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 551}
 552
 553bool f2fs_is_compress_level_valid(int alg, int lvl)
 554{
 555	const struct f2fs_compress_ops *cops = f2fs_cops[alg];
 556
 557	if (cops->is_level_valid)
 558		return cops->is_level_valid(lvl);
 559
 560	return lvl == 0;
 561}
 562
 563static mempool_t *compress_page_pool;
 564static int num_compress_pages = 512;
 565module_param(num_compress_pages, uint, 0444);
 566MODULE_PARM_DESC(num_compress_pages,
 567		"Number of intermediate compress pages to preallocate");
 568
 569int __init f2fs_init_compress_mempool(void)
 570{
 571	compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 572	return compress_page_pool ? 0 : -ENOMEM;
 573}
 574
 575void f2fs_destroy_compress_mempool(void)
 576{
 577	mempool_destroy(compress_page_pool);
 578}
 579
 580static struct page *f2fs_compress_alloc_page(void)
 581{
 582	struct page *page;
 583
 584	page = mempool_alloc(compress_page_pool, GFP_NOFS);
 585	lock_page(page);
 586
 587	return page;
 588}
 589
 590static void f2fs_compress_free_page(struct page *page)
 591{
 592	struct folio *folio;
 593
 594	if (!page)
 595		return;
 596	folio = page_folio(page);
 597	folio_detach_private(folio);
 598	folio->mapping = NULL;
 599	folio_unlock(folio);
 600	mempool_free(page, compress_page_pool);
 601}
 602
 603#define MAX_VMAP_RETRIES	3
 604
 605static void *f2fs_vmap(struct page **pages, unsigned int count)
 606{
 607	int i;
 608	void *buf = NULL;
 609
 610	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 611		buf = vm_map_ram(pages, count, -1);
 612		if (buf)
 613			break;
 614		vm_unmap_aliases();
 615	}
 616	return buf;
 617}
 618
 619static int f2fs_compress_pages(struct compress_ctx *cc)
 620{
 621	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 622	struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 623	const struct f2fs_compress_ops *cops =
 624				f2fs_cops[fi->i_compress_algorithm];
 625	unsigned int max_len, new_nr_cpages;
 626	u32 chksum = 0;
 627	int i, ret;
 628
 629	trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 630				cc->cluster_size, fi->i_compress_algorithm);
 631
 632	if (cops->init_compress_ctx) {
 633		ret = cops->init_compress_ctx(cc);
 634		if (ret)
 635			goto out;
 636	}
 637
 638	max_len = COMPRESS_HEADER_SIZE + cc->clen;
 639	cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 640	cc->valid_nr_cpages = cc->nr_cpages;
 641
 642	cc->cpages = page_array_alloc(sbi, cc->nr_cpages);
 643	if (!cc->cpages) {
 644		ret = -ENOMEM;
 645		goto destroy_compress_ctx;
 646	}
 647
 648	for (i = 0; i < cc->nr_cpages; i++)
 649		cc->cpages[i] = f2fs_compress_alloc_page();
 650
 651	cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 652	if (!cc->rbuf) {
 653		ret = -ENOMEM;
 654		goto out_free_cpages;
 655	}
 656
 657	cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 658	if (!cc->cbuf) {
 659		ret = -ENOMEM;
 660		goto out_vunmap_rbuf;
 661	}
 662
 663	ret = cops->compress_pages(cc);
 664	if (ret)
 665		goto out_vunmap_cbuf;
 666
 667	max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 668
 669	if (cc->clen > max_len) {
 670		ret = -EAGAIN;
 671		goto out_vunmap_cbuf;
 672	}
 673
 674	cc->cbuf->clen = cpu_to_le32(cc->clen);
 675
 676	if (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))
 677		chksum = f2fs_crc32(cc->cbuf->cdata, cc->clen);
 678	cc->cbuf->chksum = cpu_to_le32(chksum);
 679
 680	for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 681		cc->cbuf->reserved[i] = cpu_to_le32(0);
 682
 683	new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 684
 685	/* zero out any unused part of the last page */
 686	memset(&cc->cbuf->cdata[cc->clen], 0,
 687			(new_nr_cpages * PAGE_SIZE) -
 688			(cc->clen + COMPRESS_HEADER_SIZE));
 689
 690	vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 691	vm_unmap_ram(cc->rbuf, cc->cluster_size);
 692
 693	for (i = new_nr_cpages; i < cc->nr_cpages; i++) {
 694		f2fs_compress_free_page(cc->cpages[i]);
 695		cc->cpages[i] = NULL;
 696	}
 697
 698	if (cops->destroy_compress_ctx)
 699		cops->destroy_compress_ctx(cc);
 700
 701	cc->valid_nr_cpages = new_nr_cpages;
 702
 703	trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 704							cc->clen, ret);
 705	return 0;
 706
 707out_vunmap_cbuf:
 708	vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 709out_vunmap_rbuf:
 710	vm_unmap_ram(cc->rbuf, cc->cluster_size);
 711out_free_cpages:
 712	for (i = 0; i < cc->nr_cpages; i++) {
 713		if (cc->cpages[i])
 714			f2fs_compress_free_page(cc->cpages[i]);
 715	}
 716	page_array_free(sbi, cc->cpages, cc->nr_cpages);
 717	cc->cpages = NULL;
 718destroy_compress_ctx:
 719	if (cops->destroy_compress_ctx)
 720		cops->destroy_compress_ctx(cc);
 721out:
 722	trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 723							cc->clen, ret);
 724	return ret;
 725}
 726
 727static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
 728		bool pre_alloc);
 729static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
 730		bool bypass_destroy_callback, bool pre_alloc);
 731
 732void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
 733{
 734	struct f2fs_sb_info *sbi = dic->sbi;
 735	struct f2fs_inode_info *fi = F2FS_I(dic->inode);
 736	const struct f2fs_compress_ops *cops =
 737			f2fs_cops[fi->i_compress_algorithm];
 738	bool bypass_callback = false;
 739	int ret;
 740
 741	trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 742				dic->cluster_size, fi->i_compress_algorithm);
 743
 744	if (dic->failed) {
 745		ret = -EIO;
 746		goto out_end_io;
 747	}
 748
 749	ret = f2fs_prepare_decomp_mem(dic, false);
 750	if (ret) {
 751		bypass_callback = true;
 752		goto out_release;
 753	}
 754
 755	dic->clen = le32_to_cpu(dic->cbuf->clen);
 756	dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 757
 758	if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 759		ret = -EFSCORRUPTED;
 760
 761		/* Avoid f2fs_commit_super in irq context */
 762		f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
 763		goto out_release;
 764	}
 765
 766	ret = cops->decompress_pages(dic);
 767
 768	if (!ret && (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))) {
 769		u32 provided = le32_to_cpu(dic->cbuf->chksum);
 770		u32 calculated = f2fs_crc32(dic->cbuf->cdata, dic->clen);
 771
 772		if (provided != calculated) {
 773			if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 774				set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 775				f2fs_info_ratelimited(sbi,
 776					"checksum invalid, nid = %lu, %x vs %x",
 777					dic->inode->i_ino,
 778					provided, calculated);
 779			}
 780			set_sbi_flag(sbi, SBI_NEED_FSCK);
 781		}
 782	}
 783
 784out_release:
 785	f2fs_release_decomp_mem(dic, bypass_callback, false);
 786
 787out_end_io:
 788	trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 789							dic->clen, ret);
 790	f2fs_decompress_end_io(dic, ret, in_task);
 791}
 792
 793static void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi,
 794		struct folio *folio, nid_t ino, block_t blkaddr);
 795
 796/*
 797 * This is called when a page of a compressed cluster has been read from disk
 798 * (or failed to be read from disk).  It checks whether this page was the last
 799 * page being waited on in the cluster, and if so, it decompresses the cluster
 800 * (or in the case of a failure, cleans up without actually decompressing).
 801 */
 802void f2fs_end_read_compressed_page(struct folio *folio, bool failed,
 803		block_t blkaddr, bool in_task)
 804{
 805	struct decompress_io_ctx *dic = folio->private;
 806	struct f2fs_sb_info *sbi = dic->sbi;
 807
 808	dec_page_count(sbi, F2FS_RD_DATA);
 809
 810	if (failed)
 811		WRITE_ONCE(dic->failed, true);
 812	else if (blkaddr && in_task)
 813		f2fs_cache_compressed_page(sbi, folio,
 814					dic->inode->i_ino, blkaddr);
 815
 816	if (atomic_dec_and_test(&dic->remaining_pages))
 817		f2fs_decompress_cluster(dic, in_task);
 818}
 819
 820static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 821{
 822	if (cc->cluster_idx == NULL_CLUSTER)
 823		return true;
 824	return cc->cluster_idx == cluster_idx(cc, index);
 825}
 826
 827bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 828{
 829	return cc->nr_rpages == 0;
 830}
 831
 832static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 833{
 834	return cc->cluster_size == cc->nr_rpages;
 835}
 836
 837bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 838{
 839	if (f2fs_cluster_is_empty(cc))
 840		return true;
 841	return is_page_in_cluster(cc, index);
 842}
 843
 844bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
 845				int index, int nr_pages, bool uptodate)
 846{
 847	unsigned long pgidx = page_folio(pages[index])->index;
 848	int i = uptodate ? 0 : 1;
 849
 850	/*
 851	 * when uptodate set to true, try to check all pages in cluster is
 852	 * uptodate or not.
 853	 */
 854	if (uptodate && (pgidx % cc->cluster_size))
 855		return false;
 856
 857	if (nr_pages - index < cc->cluster_size)
 858		return false;
 859
 860	for (; i < cc->cluster_size; i++) {
 861		struct folio *folio = page_folio(pages[index + i]);
 862
 863		if (folio->index != pgidx + i)
 864			return false;
 865		if (uptodate && !folio_test_uptodate(folio))
 866			return false;
 867	}
 868
 869	return true;
 870}
 871
 872static bool cluster_has_invalid_data(struct compress_ctx *cc)
 873{
 874	loff_t i_size = i_size_read(cc->inode);
 875	unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 876	int i;
 877
 878	for (i = 0; i < cc->cluster_size; i++) {
 879		struct page *page = cc->rpages[i];
 880
 881		f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
 882
 883		/* beyond EOF */
 884		if (page_folio(page)->index >= nr_pages)
 885			return true;
 886	}
 887	return false;
 888}
 889
 890bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
 891{
 892#ifdef CONFIG_F2FS_CHECK_FS
 893	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 894	unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
 895	int cluster_end = 0;
 896	unsigned int count;
 897	int i;
 898	char *reason = "";
 899
 900	if (dn->data_blkaddr != COMPRESS_ADDR)
 901		return false;
 902
 903	/* [..., COMPR_ADDR, ...] */
 904	if (dn->ofs_in_node % cluster_size) {
 905		reason = "[*|C|*|*]";
 906		goto out;
 907	}
 908
 909	for (i = 1, count = 1; i < cluster_size; i++, count++) {
 910		block_t blkaddr = data_blkaddr(dn->inode, dn->node_folio,
 911							dn->ofs_in_node + i);
 912
 913		/* [COMPR_ADDR, ..., COMPR_ADDR] */
 914		if (blkaddr == COMPRESS_ADDR) {
 915			reason = "[C|*|C|*]";
 916			goto out;
 917		}
 918		if (!__is_valid_data_blkaddr(blkaddr)) {
 919			if (!cluster_end)
 920				cluster_end = i;
 921			continue;
 922		}
 923		/* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
 924		if (cluster_end) {
 925			reason = "[C|N|N|V]";
 926			goto out;
 927		}
 928	}
 929
 930	f2fs_bug_on(F2FS_I_SB(dn->inode), count != cluster_size &&
 931		!is_inode_flag_set(dn->inode, FI_COMPRESS_RELEASED));
 932
 933	return false;
 934out:
 935	f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
 936			dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
 937	set_sbi_flag(sbi, SBI_NEED_FSCK);
 938	return true;
 939#else
 940	return false;
 941#endif
 942}
 943
 944static int __f2fs_get_cluster_blocks(struct inode *inode,
 945					struct dnode_of_data *dn)
 946{
 947	unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
 948	int count, i;
 949
 950	for (i = 0, count = 0; i < cluster_size; i++) {
 951		block_t blkaddr = data_blkaddr(dn->inode, dn->node_folio,
 952							dn->ofs_in_node + i);
 953
 954		if (__is_valid_data_blkaddr(blkaddr))
 955			count++;
 956	}
 957
 958	return count;
 959}
 960
 961static int __f2fs_cluster_blocks(struct inode *inode, unsigned int cluster_idx,
 962				enum cluster_check_type type)
 963{
 964	struct dnode_of_data dn;
 965	unsigned int start_idx = cluster_idx <<
 966				F2FS_I(inode)->i_log_cluster_size;
 967	int ret;
 968
 969	set_new_dnode(&dn, inode, NULL, NULL, 0);
 970	ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
 971	if (ret) {
 972		if (ret == -ENOENT)
 973			ret = 0;
 974		goto fail;
 975	}
 976
 977	if (f2fs_sanity_check_cluster(&dn)) {
 978		ret = -EFSCORRUPTED;
 979		goto fail;
 980	}
 981
 982	if (dn.data_blkaddr == COMPRESS_ADDR) {
 983		if (type == CLUSTER_COMPR_BLKS)
 984			ret = 1 + __f2fs_get_cluster_blocks(inode, &dn);
 985		else if (type == CLUSTER_IS_COMPR)
 986			ret = 1;
 987	} else if (type == CLUSTER_RAW_BLKS) {
 988		ret = __f2fs_get_cluster_blocks(inode, &dn);
 989	}
 990fail:
 991	f2fs_put_dnode(&dn);
 992	return ret;
 993}
 994
 995/* return # of compressed blocks in compressed cluster */
 996static int f2fs_compressed_blocks(struct compress_ctx *cc)
 997{
 998	return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx,
 999		CLUSTER_COMPR_BLKS);
1000}
1001
1002/* return # of raw blocks in non-compressed cluster */
1003static int f2fs_decompressed_blocks(struct inode *inode,
1004				unsigned int cluster_idx)
1005{
1006	return __f2fs_cluster_blocks(inode, cluster_idx,
1007		CLUSTER_RAW_BLKS);
1008}
1009
1010/* return whether cluster is compressed one or not */
1011int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
1012{
1013	return __f2fs_cluster_blocks(inode,
1014		index >> F2FS_I(inode)->i_log_cluster_size,
1015		CLUSTER_IS_COMPR);
1016}
1017
1018/* return whether cluster contains non raw blocks or not */
1019bool f2fs_is_sparse_cluster(struct inode *inode, pgoff_t index)
1020{
1021	unsigned int cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size;
1022
1023	return f2fs_decompressed_blocks(inode, cluster_idx) !=
1024		F2FS_I(inode)->i_cluster_size;
1025}
1026
1027static bool cluster_may_compress(struct compress_ctx *cc)
1028{
1029	if (!f2fs_need_compress_data(cc->inode))
1030		return false;
1031	if (f2fs_is_atomic_file(cc->inode))
1032		return false;
1033	if (!f2fs_cluster_is_full(cc))
1034		return false;
1035	if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
1036		return false;
1037	return !cluster_has_invalid_data(cc);
1038}
1039
1040static void set_cluster_writeback(struct compress_ctx *cc)
1041{
1042	int i;
1043
1044	for (i = 0; i < cc->cluster_size; i++) {
1045		if (cc->rpages[i])
1046			set_page_writeback(cc->rpages[i]);
1047	}
1048}
1049
1050static void cancel_cluster_writeback(struct compress_ctx *cc,
1051			struct compress_io_ctx *cic, int submitted)
1052{
1053	int i;
1054
1055	/* Wait for submitted IOs. */
1056	if (submitted > 1) {
1057		f2fs_submit_merged_write(F2FS_I_SB(cc->inode), DATA);
1058		while (atomic_read(&cic->pending_pages) !=
1059					(cc->valid_nr_cpages - submitted + 1))
1060			f2fs_io_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT);
1061	}
1062
1063	/* Cancel writeback and stay locked. */
1064	for (i = 0; i < cc->cluster_size; i++) {
1065		if (i < submitted) {
1066			inode_inc_dirty_pages(cc->inode);
1067			lock_page(cc->rpages[i]);
1068		}
1069		clear_page_private_gcing(cc->rpages[i]);
1070		if (folio_test_writeback(page_folio(cc->rpages[i])))
1071			end_page_writeback(cc->rpages[i]);
1072	}
1073}
1074
1075static void set_cluster_dirty(struct compress_ctx *cc)
1076{
1077	int i;
1078
1079	for (i = 0; i < cc->cluster_size; i++)
1080		if (cc->rpages[i]) {
1081			set_page_dirty(cc->rpages[i]);
1082			set_page_private_gcing(cc->rpages[i]);
1083		}
1084}
1085
1086static int prepare_compress_overwrite(struct compress_ctx *cc,
1087		struct page **pagep, pgoff_t index, void **fsdata)
1088{
1089	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1090	struct address_space *mapping = cc->inode->i_mapping;
1091	struct folio *folio;
1092	sector_t last_block_in_bio;
1093	fgf_t fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1094	pgoff_t start_idx = start_idx_of_cluster(cc);
1095	int i, ret;
1096
1097retry:
1098	ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
1099	if (ret <= 0)
1100		return ret;
1101
1102	ret = f2fs_init_compress_ctx(cc);
1103	if (ret)
1104		return ret;
1105
1106	/* keep folio reference to avoid page reclaim */
1107	for (i = 0; i < cc->cluster_size; i++) {
1108		folio = f2fs_filemap_get_folio(mapping, start_idx + i,
1109				fgp_flag, GFP_NOFS);
1110		if (IS_ERR(folio)) {
1111			ret = PTR_ERR(folio);
1112			goto unlock_pages;
1113		}
1114
1115		if (folio_test_uptodate(folio))
1116			f2fs_folio_put(folio, true);
1117		else
1118			f2fs_compress_ctx_add_page(cc, folio);
1119	}
1120
1121	if (!f2fs_cluster_is_empty(cc)) {
1122		struct bio *bio = NULL;
1123
1124		ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1125					&last_block_in_bio, NULL, true);
1126		f2fs_put_rpages(cc);
1127		f2fs_destroy_compress_ctx(cc, true);
1128		if (ret)
1129			goto out;
1130		if (bio)
1131			f2fs_submit_read_bio(sbi, bio, DATA);
1132
1133		ret = f2fs_init_compress_ctx(cc);
1134		if (ret)
1135			goto out;
1136	}
1137
1138	for (i = 0; i < cc->cluster_size; i++) {
1139		f2fs_bug_on(sbi, cc->rpages[i]);
1140
1141		folio = filemap_lock_folio(mapping, start_idx + i);
1142		if (IS_ERR(folio)) {
1143			/* folio could be truncated */
1144			goto release_and_retry;
1145		}
1146
1147		f2fs_folio_wait_writeback(folio, DATA, true, true);
1148		f2fs_compress_ctx_add_page(cc, folio);
1149
1150		if (!folio_test_uptodate(folio)) {
1151			f2fs_handle_page_eio(sbi, folio, DATA);
1152release_and_retry:
1153			f2fs_put_rpages(cc);
1154			f2fs_unlock_rpages(cc, i + 1);
1155			f2fs_destroy_compress_ctx(cc, true);
1156			goto retry;
1157		}
1158	}
1159
1160	if (likely(!ret)) {
1161		*fsdata = cc->rpages;
1162		*pagep = cc->rpages[offset_in_cluster(cc, index)];
1163		return cc->cluster_size;
1164	}
1165
1166unlock_pages:
1167	f2fs_put_rpages(cc);
1168	f2fs_unlock_rpages(cc, i);
1169	f2fs_destroy_compress_ctx(cc, true);
1170out:
1171	return ret;
1172}
1173
1174int f2fs_prepare_compress_overwrite(struct inode *inode,
1175		struct page **pagep, pgoff_t index, void **fsdata)
1176{
1177	struct compress_ctx cc = {
1178		.inode = inode,
1179		.log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1180		.cluster_size = F2FS_I(inode)->i_cluster_size,
1181		.cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1182		.rpages = NULL,
1183		.nr_rpages = 0,
1184	};
1185
1186	return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1187}
1188
1189bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1190					pgoff_t index, unsigned copied)
1191
1192{
1193	struct compress_ctx cc = {
1194		.inode = inode,
1195		.log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1196		.cluster_size = F2FS_I(inode)->i_cluster_size,
1197		.rpages = fsdata,
1198	};
1199	struct folio *folio = page_folio(cc.rpages[0]);
1200	bool first_index = (index == folio->index);
1201
1202	if (copied)
1203		set_cluster_dirty(&cc);
1204
1205	f2fs_put_rpages_wbc(&cc, NULL, false, true);
1206	f2fs_destroy_compress_ctx(&cc, false);
1207
1208	return first_index;
1209}
1210
1211int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1212{
1213	void *fsdata = NULL;
1214	struct page *pagep;
1215	struct page **rpages;
1216	int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1217	pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1218							log_cluster_size;
1219	int i;
1220	int err;
1221
1222	err = f2fs_is_compressed_cluster(inode, start_idx);
1223	if (err < 0)
1224		return err;
1225
1226	/* truncate normal cluster */
1227	if (!err)
1228		return f2fs_do_truncate_blocks(inode, from, lock);
1229
1230	/* truncate compressed cluster */
1231	err = f2fs_prepare_compress_overwrite(inode, &pagep,
1232						start_idx, &fsdata);
1233
1234	/* should not be a normal cluster */
1235	f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1236
1237	if (err <= 0)
1238		return err;
1239
1240	rpages = fsdata;
1241
1242	for (i = (1 << log_cluster_size) - 1; i >= 0; i--) {
1243		struct folio *folio = page_folio(rpages[i]);
1244		loff_t start = (loff_t)folio->index << PAGE_SHIFT;
1245		loff_t offset = from > start ? from - start : 0;
1246
1247		folio_zero_segment(folio, offset, folio_size(folio));
1248
1249		if (from >= start)
1250			break;
1251	}
1252
1253	f2fs_compress_write_end(inode, fsdata, start_idx, true);
1254
1255	err = filemap_write_and_wait_range(inode->i_mapping,
1256			round_down(from, 1 << log_cluster_size << PAGE_SHIFT),
1257			LLONG_MAX);
1258	if (err)
1259		return err;
1260
1261	truncate_pagecache(inode, from);
1262
1263	return f2fs_do_truncate_blocks(inode, round_up(from, PAGE_SIZE), lock);
1264}
1265
1266static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1267					int *submitted,
1268					struct writeback_control *wbc,
1269					enum iostat_type io_type)
1270{
1271	struct inode *inode = cc->inode;
1272	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1273	struct f2fs_inode_info *fi = F2FS_I(inode);
1274	struct f2fs_io_info fio = {
1275		.sbi = sbi,
1276		.ino = cc->inode->i_ino,
1277		.type = DATA,
1278		.op = REQ_OP_WRITE,
1279		.op_flags = wbc_to_write_flags(wbc),
1280		.old_blkaddr = NEW_ADDR,
1281		.page = NULL,
1282		.encrypted_page = NULL,
1283		.compressed_page = NULL,
1284		.io_type = io_type,
1285		.io_wbc = wbc,
1286		.encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode) ?
1287									1 : 0,
1288	};
1289	struct folio *folio;
1290	struct dnode_of_data dn;
1291	struct node_info ni;
1292	struct compress_io_ctx *cic;
1293	pgoff_t start_idx = start_idx_of_cluster(cc);
1294	unsigned int last_index = cc->cluster_size - 1;
1295	loff_t psize;
1296	int i, err;
1297	bool quota_inode = IS_NOQUOTA(inode);
1298
1299	/* we should bypass data pages to proceed the kworker jobs */
1300	if (unlikely(f2fs_cp_error(sbi))) {
1301		mapping_set_error(inode->i_mapping, -EIO);
1302		goto out_free;
1303	}
1304
1305	if (quota_inode) {
1306		/*
1307		 * We need to wait for node_write to avoid block allocation during
1308		 * checkpoint. This can only happen to quota writes which can cause
1309		 * the below discard race condition.
1310		 */
1311		f2fs_down_read(&sbi->node_write);
1312	} else if (!f2fs_trylock_op(sbi)) {
1313		goto out_free;
1314	}
1315
1316	set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1317
1318	err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1319	if (err)
1320		goto out_unlock_op;
1321
1322	for (i = 0; i < cc->cluster_size; i++) {
1323		if (data_blkaddr(dn.inode, dn.node_folio,
1324					dn.ofs_in_node + i) == NULL_ADDR)
1325			goto out_put_dnode;
1326	}
1327
1328	folio = page_folio(cc->rpages[last_index]);
1329	psize = folio_next_pos(folio);
1330
1331	err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
1332	if (err)
1333		goto out_put_dnode;
1334
1335	fio.version = ni.version;
1336
1337	cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1338	if (!cic)
1339		goto out_put_dnode;
1340
1341	cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1342	cic->inode = inode;
1343	atomic_set(&cic->pending_pages, cc->valid_nr_cpages);
1344	cic->rpages = page_array_alloc(sbi, cc->cluster_size);
1345	if (!cic->rpages)
1346		goto out_put_cic;
1347
1348	cic->nr_rpages = cc->cluster_size;
1349
1350	for (i = 0; i < cc->valid_nr_cpages; i++) {
1351		f2fs_set_compressed_page(cc->cpages[i], inode,
1352				page_folio(cc->rpages[i + 1])->index, cic);
1353		fio.compressed_page = cc->cpages[i];
1354
1355		fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_folio,
1356						dn.ofs_in_node + i + 1);
1357
1358		/* wait for GCed page writeback via META_MAPPING */
1359		f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1360
1361		if (fio.encrypted) {
1362			fio.page = cc->rpages[i + 1];
1363			err = f2fs_encrypt_one_page(&fio);
1364			if (err)
1365				goto out_destroy_crypt;
1366			cc->cpages[i] = fio.encrypted_page;
1367		}
1368	}
1369
1370	set_cluster_writeback(cc);
1371
1372	for (i = 0; i < cc->cluster_size; i++)
1373		cic->rpages[i] = cc->rpages[i];
1374
1375	for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1376		block_t blkaddr;
1377
1378		blkaddr = f2fs_data_blkaddr(&dn);
1379		fio.page = cc->rpages[i];
1380		fio.old_blkaddr = blkaddr;
1381
1382		/* cluster header */
1383		if (i == 0) {
1384			if (blkaddr == COMPRESS_ADDR)
1385				fio.compr_blocks++;
1386			if (__is_valid_data_blkaddr(blkaddr))
1387				f2fs_invalidate_blocks(sbi, blkaddr, 1);
1388			f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1389			goto unlock_continue;
1390		}
1391
1392		if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1393			fio.compr_blocks++;
1394
1395		if (i > cc->valid_nr_cpages) {
1396			if (__is_valid_data_blkaddr(blkaddr)) {
1397				f2fs_invalidate_blocks(sbi, blkaddr, 1);
1398				f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1399			}
1400			goto unlock_continue;
1401		}
1402
1403		f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1404
1405		if (fio.encrypted)
1406			fio.encrypted_page = cc->cpages[i - 1];
1407		else
1408			fio.compressed_page = cc->cpages[i - 1];
1409
1410		cc->cpages[i - 1] = NULL;
1411		fio.submitted = 0;
1412		f2fs_outplace_write_data(&dn, &fio);
1413		if (unlikely(!fio.submitted)) {
1414			cancel_cluster_writeback(cc, cic, i);
1415
1416			/* To call fscrypt_finalize_bounce_page */
1417			i = cc->valid_nr_cpages;
1418			*submitted = 0;
1419			goto out_destroy_crypt;
1420		}
1421		(*submitted)++;
1422unlock_continue:
1423		inode_dec_dirty_pages(cc->inode);
1424		folio_unlock(fio.folio);
1425	}
1426
1427	if (fio.compr_blocks)
1428		f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1429	f2fs_i_compr_blocks_update(inode, cc->valid_nr_cpages, true);
1430	add_compr_block_stat(inode, cc->valid_nr_cpages);
1431
1432	set_inode_flag(cc->inode, FI_APPEND_WRITE);
1433
1434	f2fs_put_dnode(&dn);
1435	if (quota_inode)
1436		f2fs_up_read(&sbi->node_write);
1437	else
1438		f2fs_unlock_op(sbi);
1439
1440	spin_lock(&fi->i_size_lock);
1441	if (fi->last_disk_size < psize)
1442		fi->last_disk_size = psize;
1443	spin_unlock(&fi->i_size_lock);
1444
1445	f2fs_put_rpages(cc);
1446	page_array_free(sbi, cc->cpages, cc->nr_cpages);
1447	cc->cpages = NULL;
1448	f2fs_destroy_compress_ctx(cc, false);
1449	return 0;
1450
1451out_destroy_crypt:
1452	page_array_free(sbi, cic->rpages, cc->cluster_size);
1453
1454	for (--i; i >= 0; i--) {
1455		if (!cc->cpages[i])
1456			continue;
1457		fscrypt_finalize_bounce_page(&cc->cpages[i]);
1458	}
1459out_put_cic:
1460	kmem_cache_free(cic_entry_slab, cic);
1461out_put_dnode:
1462	f2fs_put_dnode(&dn);
1463out_unlock_op:
1464	if (quota_inode)
1465		f2fs_up_read(&sbi->node_write);
1466	else
1467		f2fs_unlock_op(sbi);
1468out_free:
1469	for (i = 0; i < cc->valid_nr_cpages; i++) {
1470		f2fs_compress_free_page(cc->cpages[i]);
1471		cc->cpages[i] = NULL;
1472	}
1473	page_array_free(sbi, cc->cpages, cc->nr_cpages);
1474	cc->cpages = NULL;
1475	return -EAGAIN;
1476}
1477
1478void f2fs_compress_write_end_io(struct bio *bio, struct folio *folio)
1479{
1480	struct page *page = &folio->page;
1481	struct f2fs_sb_info *sbi = bio->bi_private;
1482	struct compress_io_ctx *cic = folio->private;
1483	enum count_type type = WB_DATA_TYPE(folio,
1484				f2fs_is_compressed_page(folio));
1485	int i;
1486
1487	if (unlikely(bio->bi_status != BLK_STS_OK))
1488		mapping_set_error(cic->inode->i_mapping, -EIO);
1489
1490	f2fs_compress_free_page(page);
1491
1492	dec_page_count(sbi, type);
1493
1494	if (atomic_dec_return(&cic->pending_pages))
1495		return;
1496
1497	for (i = 0; i < cic->nr_rpages; i++) {
1498		WARN_ON(!cic->rpages[i]);
1499		clear_page_private_gcing(cic->rpages[i]);
1500		end_page_writeback(cic->rpages[i]);
1501	}
1502
1503	page_array_free(sbi, cic->rpages, cic->nr_rpages);
1504	kmem_cache_free(cic_entry_slab, cic);
1505}
1506
1507static int f2fs_write_raw_pages(struct compress_ctx *cc,
1508					int *submitted_p,
1509					struct writeback_control *wbc,
1510					enum iostat_type io_type)
1511{
1512	struct address_space *mapping = cc->inode->i_mapping;
1513	struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
1514	int submitted, compr_blocks, i;
1515	int ret = 0;
1516
1517	compr_blocks = f2fs_compressed_blocks(cc);
1518
1519	for (i = 0; i < cc->cluster_size; i++) {
1520		if (!cc->rpages[i])
1521			continue;
1522
1523		redirty_page_for_writepage(wbc, cc->rpages[i]);
1524		unlock_page(cc->rpages[i]);
1525	}
1526
1527	if (compr_blocks < 0)
1528		return compr_blocks;
1529
1530	/* overwrite compressed cluster w/ normal cluster */
1531	if (compr_blocks > 0)
1532		f2fs_lock_op(sbi);
1533
1534	for (i = 0; i < cc->cluster_size; i++) {
1535		struct folio *folio;
1536
1537		if (!cc->rpages[i])
1538			continue;
1539		folio = page_folio(cc->rpages[i]);
1540retry_write:
1541		folio_lock(folio);
1542
1543		if (folio->mapping != mapping) {
1544continue_unlock:
1545			folio_unlock(folio);
1546			continue;
1547		}
1548
1549		if (!folio_test_dirty(folio))
1550			goto continue_unlock;
1551
1552		if (folio_test_writeback(folio)) {
1553			if (wbc->sync_mode == WB_SYNC_NONE)
1554				goto continue_unlock;
1555			f2fs_folio_wait_writeback(folio, DATA, true, true);
1556		}
1557
1558		if (!folio_clear_dirty_for_io(folio))
1559			goto continue_unlock;
1560
1561		submitted = 0;
1562		ret = f2fs_write_single_data_page(folio, &submitted,
1563						NULL, NULL, wbc, io_type,
1564						compr_blocks, false);
1565		if (ret) {
1566			if (ret == 1) {
1567				ret = 0;
1568			} else if (ret == -EAGAIN) {
1569				ret = 0;
1570				/*
1571				 * for quota file, just redirty left pages to
1572				 * avoid deadlock caused by cluster update race
1573				 * from foreground operation.
1574				 */
1575				if (IS_NOQUOTA(cc->inode))
1576					goto out;
1577				f2fs_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT);
1578				goto retry_write;
1579			}
1580			goto out;
1581		}
1582
1583		*submitted_p += submitted;
1584	}
1585
1586out:
1587	if (compr_blocks > 0)
1588		f2fs_unlock_op(sbi);
1589
1590	f2fs_balance_fs(sbi, true);
1591	return ret;
1592}
1593
1594int f2fs_write_multi_pages(struct compress_ctx *cc,
1595					int *submitted,
1596					struct writeback_control *wbc,
1597					enum iostat_type io_type)
1598{
1599	int err;
1600
1601	*submitted = 0;
1602	if (cluster_may_compress(cc)) {
1603		err = f2fs_compress_pages(cc);
1604		if (err == -EAGAIN) {
1605			add_compr_block_stat(cc->inode, cc->cluster_size);
1606			goto write;
1607		} else if (err) {
1608			f2fs_put_rpages_wbc(cc, wbc, true, true);
1609			goto destroy_out;
1610		}
1611
1612		err = f2fs_write_compressed_pages(cc, submitted,
1613							wbc, io_type);
1614		if (!err)
1615			return 0;
1616		f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1617	}
1618write:
1619	f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1620
1621	err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1622	f2fs_put_rpages_wbc(cc, wbc, false, false);
1623destroy_out:
1624	f2fs_destroy_compress_ctx(cc, false);
1625	return err;
1626}
1627
1628static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
1629		bool pre_alloc)
1630{
1631	return pre_alloc ^ f2fs_low_mem_mode(sbi);
1632}
1633
1634static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
1635		bool pre_alloc)
1636{
1637	const struct f2fs_compress_ops *cops = f2fs_cops[dic->compress_algorithm];
1638	int i;
1639
1640	if (!allow_memalloc_for_decomp(dic->sbi, pre_alloc))
1641		return 0;
1642
1643	dic->tpages = page_array_alloc(dic->sbi, dic->cluster_size);
1644	if (!dic->tpages)
1645		return -ENOMEM;
1646
1647	for (i = 0; i < dic->cluster_size; i++) {
1648		if (dic->rpages[i]) {
1649			dic->tpages[i] = dic->rpages[i];
1650			continue;
1651		}
1652
1653		dic->tpages[i] = f2fs_compress_alloc_page();
1654	}
1655
1656	dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
1657	if (!dic->rbuf)
1658		return -ENOMEM;
1659
1660	dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
1661	if (!dic->cbuf)
1662		return -ENOMEM;
1663
1664	if (cops->init_decompress_ctx)
1665		return cops->init_decompress_ctx(dic);
1666
1667	return 0;
1668}
1669
1670static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
1671		bool bypass_destroy_callback, bool pre_alloc)
1672{
1673	const struct f2fs_compress_ops *cops = f2fs_cops[dic->compress_algorithm];
1674
1675	if (!allow_memalloc_for_decomp(dic->sbi, pre_alloc))
1676		return;
1677
1678	if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
1679		cops->destroy_decompress_ctx(dic);
1680
1681	if (dic->cbuf)
1682		vm_unmap_ram(dic->cbuf, dic->nr_cpages);
1683
1684	if (dic->rbuf)
1685		vm_unmap_ram(dic->rbuf, dic->cluster_size);
1686}
1687
1688static void f2fs_free_dic(struct decompress_io_ctx *dic,
1689		bool bypass_destroy_callback);
1690
1691struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1692{
1693	struct decompress_io_ctx *dic;
1694	pgoff_t start_idx = start_idx_of_cluster(cc);
1695	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1696	int i, ret;
1697
1698	dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1699	if (!dic)
1700		return ERR_PTR(-ENOMEM);
1701
1702	dic->rpages = page_array_alloc(sbi, cc->cluster_size);
1703	if (!dic->rpages) {
1704		kmem_cache_free(dic_entry_slab, dic);
1705		return ERR_PTR(-ENOMEM);
1706	}
1707
1708	dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1709	dic->inode = cc->inode;
1710	dic->sbi = sbi;
1711	dic->compress_algorithm = F2FS_I(cc->inode)->i_compress_algorithm;
1712	atomic_set(&dic->remaining_pages, cc->nr_cpages);
1713	dic->cluster_idx = cc->cluster_idx;
1714	dic->cluster_size = cc->cluster_size;
1715	dic->log_cluster_size = cc->log_cluster_size;
1716	dic->nr_cpages = cc->nr_cpages;
1717	refcount_set(&dic->refcnt, 1);
1718	dic->failed = false;
1719	dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1720
1721	for (i = 0; i < dic->cluster_size; i++)
1722		dic->rpages[i] = cc->rpages[i];
1723	dic->nr_rpages = cc->cluster_size;
1724
1725	dic->cpages = page_array_alloc(sbi, dic->nr_cpages);
1726	if (!dic->cpages) {
1727		ret = -ENOMEM;
1728		goto out_free;
1729	}
1730
1731	for (i = 0; i < dic->nr_cpages; i++) {
1732		struct page *page;
1733
1734		page = f2fs_compress_alloc_page();
1735		f2fs_set_compressed_page(page, cc->inode,
1736					start_idx + i + 1, dic);
1737		dic->cpages[i] = page;
1738	}
1739
1740	ret = f2fs_prepare_decomp_mem(dic, true);
1741	if (ret)
1742		goto out_free;
1743
1744	return dic;
1745
1746out_free:
1747	f2fs_free_dic(dic, true);
1748	return ERR_PTR(ret);
1749}
1750
1751static void f2fs_free_dic(struct decompress_io_ctx *dic,
1752		bool bypass_destroy_callback)
1753{
1754	int i;
1755	/* use sbi in dic to avoid UFA of dic->inode*/
1756	struct f2fs_sb_info *sbi = dic->sbi;
1757
1758	f2fs_release_decomp_mem(dic, bypass_destroy_callback, true);
1759
1760	if (dic->tpages) {
1761		for (i = 0; i < dic->cluster_size; i++) {
1762			if (dic->rpages[i])
1763				continue;
1764			if (!dic->tpages[i])
1765				continue;
1766			f2fs_compress_free_page(dic->tpages[i]);
1767		}
1768		page_array_free(sbi, dic->tpages, dic->cluster_size);
1769	}
1770
1771	if (dic->cpages) {
1772		for (i = 0; i < dic->nr_cpages; i++) {
1773			if (!dic->cpages[i])
1774				continue;
1775			f2fs_compress_free_page(dic->cpages[i]);
1776		}
1777		page_array_free(sbi, dic->cpages, dic->nr_cpages);
1778	}
1779
1780	page_array_free(sbi, dic->rpages, dic->nr_rpages);
1781	kmem_cache_free(dic_entry_slab, dic);
1782}
1783
1784static void f2fs_late_free_dic(struct work_struct *work)
1785{
1786	struct decompress_io_ctx *dic =
1787		container_of(work, struct decompress_io_ctx, free_work);
1788
1789	f2fs_free_dic(dic, false);
1790}
1791
1792static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
1793{
1794	if (refcount_dec_and_test(&dic->refcnt)) {
1795		if (in_task) {
1796			f2fs_free_dic(dic, false);
1797		} else {
1798			INIT_WORK(&dic->free_work, f2fs_late_free_dic);
1799			queue_work(dic->sbi->post_read_wq, &dic->free_work);
1800		}
1801	}
1802}
1803
1804static void f2fs_verify_cluster(struct work_struct *work)
1805{
1806	struct decompress_io_ctx *dic =
1807		container_of(work, struct decompress_io_ctx, verity_work);
1808	int i;
1809
1810	/* Verify, update, and unlock the decompressed pages. */
1811	for (i = 0; i < dic->cluster_size; i++) {
1812		struct page *rpage = dic->rpages[i];
1813
1814		if (!rpage)
1815			continue;
1816
1817		if (fsverity_verify_page(rpage))
1818			SetPageUptodate(rpage);
1819		else
1820			ClearPageUptodate(rpage);
1821		unlock_page(rpage);
1822	}
1823
1824	f2fs_put_dic(dic, true);
1825}
1826
1827/*
1828 * This is called when a compressed cluster has been decompressed
1829 * (or failed to be read and/or decompressed).
1830 */
1831void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
1832				bool in_task)
1833{
1834	int i;
1835
1836	if (!failed && dic->need_verity) {
1837		/*
1838		 * Note that to avoid deadlocks, the verity work can't be done
1839		 * on the decompression workqueue.  This is because verifying
1840		 * the data pages can involve reading metadata pages from the
1841		 * file, and these metadata pages may be compressed.
1842		 */
1843		INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1844		fsverity_enqueue_verify_work(&dic->verity_work);
1845		return;
1846	}
1847
1848	/* Update and unlock the cluster's pagecache pages. */
1849	for (i = 0; i < dic->cluster_size; i++) {
1850		struct page *rpage = dic->rpages[i];
1851
1852		if (!rpage)
1853			continue;
1854
1855		if (failed)
1856			ClearPageUptodate(rpage);
1857		else
1858			SetPageUptodate(rpage);
1859		unlock_page(rpage);
1860	}
1861
1862	/*
1863	 * Release the reference to the decompress_io_ctx that was being held
1864	 * for I/O completion.
1865	 */
1866	f2fs_put_dic(dic, in_task);
1867}
1868
1869/*
1870 * Put a reference to a compressed folio's decompress_io_ctx.
1871 *
1872 * This is called when the folio is no longer needed and can be freed.
1873 */
1874void f2fs_put_folio_dic(struct folio *folio, bool in_task)
1875{
1876	struct decompress_io_ctx *dic = folio->private;
1877
1878	f2fs_put_dic(dic, in_task);
1879}
1880
1881/*
1882 * check whether cluster blocks are contiguous, and add extent cache entry
1883 * only if cluster blocks are logically and physically contiguous.
1884 */
1885unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn,
1886						unsigned int ofs_in_node)
1887{
1888	bool compressed = data_blkaddr(dn->inode, dn->node_folio,
1889					ofs_in_node) == COMPRESS_ADDR;
1890	int i = compressed ? 1 : 0;
1891	block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_folio,
1892							ofs_in_node + i);
1893
1894	for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
1895		block_t blkaddr = data_blkaddr(dn->inode, dn->node_folio,
1896							ofs_in_node + i);
1897
1898		if (!__is_valid_data_blkaddr(blkaddr))
1899			break;
1900		if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
1901			return 0;
1902	}
1903
1904	return compressed ? i - 1 : i;
1905}
1906
1907const struct address_space_operations f2fs_compress_aops = {
1908	.release_folio = f2fs_release_folio,
1909	.invalidate_folio = f2fs_invalidate_folio,
1910	.migrate_folio	= filemap_migrate_folio,
1911};
1912
1913struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1914{
1915	return sbi->compress_inode->i_mapping;
1916}
1917
1918void f2fs_invalidate_compress_pages_range(struct f2fs_sb_info *sbi,
1919				block_t blkaddr, unsigned int len)
1920{
1921	if (!sbi->compress_inode)
1922		return;
1923	invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr + len - 1);
1924}
1925
1926static void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi,
1927		struct folio *folio, nid_t ino, block_t blkaddr)
1928{
1929	struct folio *cfolio;
1930	int ret;
1931
1932	if (!test_opt(sbi, COMPRESS_CACHE))
1933		return;
1934
1935	if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1936		return;
1937
1938	if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
1939		return;
1940
1941	cfolio = filemap_get_folio(COMPRESS_MAPPING(sbi), blkaddr);
1942	if (!IS_ERR(cfolio)) {
1943		f2fs_folio_put(cfolio, false);
1944		return;
1945	}
1946
1947	cfolio = filemap_alloc_folio(__GFP_NOWARN | __GFP_IO, 0, NULL);
1948	if (!cfolio)
1949		return;
1950
1951	ret = filemap_add_folio(COMPRESS_MAPPING(sbi), cfolio,
1952						blkaddr, GFP_NOFS);
1953	if (ret) {
1954		f2fs_folio_put(cfolio, false);
1955		return;
1956	}
1957
1958	folio_set_f2fs_data(cfolio, ino);
1959
1960	memcpy(folio_address(cfolio), folio_address(folio), PAGE_SIZE);
1961	folio_mark_uptodate(cfolio);
1962	f2fs_folio_put(cfolio, true);
1963}
1964
1965bool f2fs_load_compressed_folio(struct f2fs_sb_info *sbi, struct folio *folio,
1966								block_t blkaddr)
1967{
1968	struct folio *cfolio;
1969	bool hitted = false;
1970
1971	if (!test_opt(sbi, COMPRESS_CACHE))
1972		return false;
1973
1974	cfolio = f2fs_filemap_get_folio(COMPRESS_MAPPING(sbi),
1975				blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1976	if (!IS_ERR(cfolio)) {
1977		if (folio_test_uptodate(cfolio)) {
1978			atomic_inc(&sbi->compress_page_hit);
1979			memcpy(folio_address(folio),
1980				folio_address(cfolio), folio_size(folio));
1981			hitted = true;
1982		}
1983		f2fs_folio_put(cfolio, true);
1984	}
1985
1986	return hitted;
1987}
1988
1989void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1990{
1991	struct address_space *mapping = COMPRESS_MAPPING(sbi);
1992	struct folio_batch fbatch;
1993	pgoff_t index = 0;
1994	pgoff_t end = MAX_BLKADDR(sbi);
1995
1996	if (!mapping->nrpages)
1997		return;
1998
1999	folio_batch_init(&fbatch);
2000
2001	do {
2002		unsigned int nr, i;
2003
2004		nr = filemap_get_folios(mapping, &index, end - 1, &fbatch);
2005		if (!nr)
2006			break;
2007
2008		for (i = 0; i < nr; i++) {
2009			struct folio *folio = fbatch.folios[i];
2010
2011			folio_lock(folio);
2012			if (folio->mapping != mapping) {
2013				folio_unlock(folio);
2014				continue;
2015			}
2016
2017			if (ino != folio_get_f2fs_data(folio)) {
2018				folio_unlock(folio);
2019				continue;
2020			}
2021
2022			generic_error_remove_folio(mapping, folio);
2023			folio_unlock(folio);
2024		}
2025		folio_batch_release(&fbatch);
2026		cond_resched();
2027	} while (index < end);
2028}
2029
2030int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
2031{
2032	struct inode *inode;
2033
2034	if (!test_opt(sbi, COMPRESS_CACHE))
2035		return 0;
2036
2037	inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
2038	if (IS_ERR(inode))
2039		return PTR_ERR(inode);
2040	sbi->compress_inode = inode;
2041
2042	sbi->compress_percent = COMPRESS_PERCENT;
2043	sbi->compress_watermark = COMPRESS_WATERMARK;
2044
2045	atomic_set(&sbi->compress_page_hit, 0);
2046
2047	return 0;
2048}
2049
2050void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
2051{
2052	if (!sbi->compress_inode)
2053		return;
2054	iput(sbi->compress_inode);
2055	sbi->compress_inode = NULL;
2056}
2057
2058int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
2059{
2060	dev_t dev = sbi->sb->s_bdev->bd_dev;
2061	char slab_name[35];
2062
2063	if (!f2fs_sb_has_compression(sbi))
2064		return 0;
2065
2066	sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
2067
2068	sbi->page_array_slab_size = sizeof(struct page *) <<
2069					F2FS_OPTION(sbi).compress_log_size;
2070
2071	sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
2072					sbi->page_array_slab_size);
2073	return sbi->page_array_slab ? 0 : -ENOMEM;
2074}
2075
2076void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
2077{
2078	kmem_cache_destroy(sbi->page_array_slab);
2079}
2080
2081int __init f2fs_init_compress_cache(void)
2082{
2083	cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
2084					sizeof(struct compress_io_ctx));
2085	if (!cic_entry_slab)
2086		return -ENOMEM;
2087	dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
2088					sizeof(struct decompress_io_ctx));
2089	if (!dic_entry_slab)
2090		goto free_cic;
2091	return 0;
2092free_cic:
2093	kmem_cache_destroy(cic_entry_slab);
2094	return -ENOMEM;
2095}
2096
2097void f2fs_destroy_compress_cache(void)
2098{
2099	kmem_cache_destroy(dic_entry_slab);
2100	kmem_cache_destroy(cic_entry_slab);
2101}