linux/fs/f2fs/compress.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * f2fs compress support
   4 *
   5 * Copyright (c) 2019 Chao Yu <chao@kernel.org>
   6 */
   7
   8#include <linux/fs.h>
   9#include <linux/f2fs_fs.h>
  10#include <linux/writeback.h>
  11#include <linux/backing-dev.h>
  12#include <linux/lzo.h>
  13#include <linux/lz4.h>
  14#include <linux/zstd.h>
  15#include <linux/pagevec.h>
  16
  17#include "f2fs.h"
  18#include "node.h"
  19#include "segment.h"
  20#include <trace/events/f2fs.h>
  21
  22static struct kmem_cache *cic_entry_slab;
  23static struct kmem_cache *dic_entry_slab;
  24
  25static void *page_array_alloc(struct inode *inode, int nr)
  26{
  27        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  28        unsigned int size = sizeof(struct page *) * nr;
  29
  30        if (likely(size <= sbi->page_array_slab_size))
  31                return kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS);
  32        return f2fs_kzalloc(sbi, size, GFP_NOFS);
  33}
  34
  35static void page_array_free(struct inode *inode, void *pages, int nr)
  36{
  37        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  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};
  57
  58static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
  59{
  60        return index & (cc->cluster_size - 1);
  61}
  62
  63static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
  64{
  65        return index >> cc->log_cluster_size;
  66}
  67
  68static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
  69{
  70        return cc->cluster_idx << cc->log_cluster_size;
  71}
  72
  73bool f2fs_is_compressed_page(struct page *page)
  74{
  75        if (!PagePrivate(page))
  76                return false;
  77        if (!page_private(page))
  78                return false;
  79        if (page_private_nonpointer(page))
  80                return false;
  81
  82        f2fs_bug_on(F2FS_M_SB(page->mapping),
  83                *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
  84        return true;
  85}
  86
  87static void f2fs_set_compressed_page(struct page *page,
  88                struct inode *inode, pgoff_t index, void *data)
  89{
  90        attach_page_private(page, (void *)data);
  91
  92        /* i_crypto_info and iv index */
  93        page->index = index;
  94        page->mapping = inode->i_mapping;
  95}
  96
  97static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
  98{
  99        int i;
 100
 101        for (i = 0; i < len; i++) {
 102                if (!cc->rpages[i])
 103                        continue;
 104                if (unlock)
 105                        unlock_page(cc->rpages[i]);
 106                else
 107                        put_page(cc->rpages[i]);
 108        }
 109}
 110
 111static void f2fs_put_rpages(struct compress_ctx *cc)
 112{
 113        f2fs_drop_rpages(cc, cc->cluster_size, false);
 114}
 115
 116static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
 117{
 118        f2fs_drop_rpages(cc, len, true);
 119}
 120
 121static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 122                struct writeback_control *wbc, bool redirty, int unlock)
 123{
 124        unsigned int i;
 125
 126        for (i = 0; i < cc->cluster_size; i++) {
 127                if (!cc->rpages[i])
 128                        continue;
 129                if (redirty)
 130                        redirty_page_for_writepage(wbc, cc->rpages[i]);
 131                f2fs_put_page(cc->rpages[i], unlock);
 132        }
 133}
 134
 135struct page *f2fs_compress_control_page(struct page *page)
 136{
 137        return ((struct compress_io_ctx *)page_private(page))->rpages[0];
 138}
 139
 140int f2fs_init_compress_ctx(struct compress_ctx *cc)
 141{
 142        if (cc->rpages)
 143                return 0;
 144
 145        cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 146        return cc->rpages ? 0 : -ENOMEM;
 147}
 148
 149void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
 150{
 151        page_array_free(cc->inode, cc->rpages, cc->cluster_size);
 152        cc->rpages = NULL;
 153        cc->nr_rpages = 0;
 154        cc->nr_cpages = 0;
 155        if (!reuse)
 156                cc->cluster_idx = NULL_CLUSTER;
 157}
 158
 159void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 160{
 161        unsigned int cluster_ofs;
 162
 163        if (!f2fs_cluster_can_merge_page(cc, page->index))
 164                f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 165
 166        cluster_ofs = offset_in_cluster(cc, page->index);
 167        cc->rpages[cluster_ofs] = page;
 168        cc->nr_rpages++;
 169        cc->cluster_idx = cluster_idx(cc, page->index);
 170}
 171
 172#ifdef CONFIG_F2FS_FS_LZO
 173static int lzo_init_compress_ctx(struct compress_ctx *cc)
 174{
 175        cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 176                                LZO1X_MEM_COMPRESS, GFP_NOFS);
 177        if (!cc->private)
 178                return -ENOMEM;
 179
 180        cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 181        return 0;
 182}
 183
 184static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 185{
 186        kvfree(cc->private);
 187        cc->private = NULL;
 188}
 189
 190static int lzo_compress_pages(struct compress_ctx *cc)
 191{
 192        int ret;
 193
 194        ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 195                                        &cc->clen, cc->private);
 196        if (ret != LZO_E_OK) {
 197                printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
 198                                KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 199                return -EIO;
 200        }
 201        return 0;
 202}
 203
 204static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 205{
 206        int ret;
 207
 208        ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 209                                                dic->rbuf, &dic->rlen);
 210        if (ret != LZO_E_OK) {
 211                printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
 212                                KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 213                return -EIO;
 214        }
 215
 216        if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 217                printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
 218                                        "expected:%lu\n", KERN_ERR,
 219                                        F2FS_I_SB(dic->inode)->sb->s_id,
 220                                        dic->rlen,
 221                                        PAGE_SIZE << dic->log_cluster_size);
 222                return -EIO;
 223        }
 224        return 0;
 225}
 226
 227static const struct f2fs_compress_ops f2fs_lzo_ops = {
 228        .init_compress_ctx      = lzo_init_compress_ctx,
 229        .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 230        .compress_pages         = lzo_compress_pages,
 231        .decompress_pages       = lzo_decompress_pages,
 232};
 233#endif
 234
 235#ifdef CONFIG_F2FS_FS_LZ4
 236static int lz4_init_compress_ctx(struct compress_ctx *cc)
 237{
 238        unsigned int size = LZ4_MEM_COMPRESS;
 239
 240#ifdef CONFIG_F2FS_FS_LZ4HC
 241        if (F2FS_I(cc->inode)->i_compress_flag >> COMPRESS_LEVEL_OFFSET)
 242                size = LZ4HC_MEM_COMPRESS;
 243#endif
 244
 245        cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
 246        if (!cc->private)
 247                return -ENOMEM;
 248
 249        /*
 250         * we do not change cc->clen to LZ4_compressBound(inputsize) to
 251         * adapt worst compress case, because lz4 compressor can handle
 252         * output budget properly.
 253         */
 254        cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 255        return 0;
 256}
 257
 258static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 259{
 260        kvfree(cc->private);
 261        cc->private = NULL;
 262}
 263
 264#ifdef CONFIG_F2FS_FS_LZ4HC
 265static int lz4hc_compress_pages(struct compress_ctx *cc)
 266{
 267        unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
 268                                                COMPRESS_LEVEL_OFFSET;
 269        int len;
 270
 271        if (level)
 272                len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 273                                        cc->clen, level, cc->private);
 274        else
 275                len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 276                                                cc->clen, cc->private);
 277        if (!len)
 278                return -EAGAIN;
 279
 280        cc->clen = len;
 281        return 0;
 282}
 283#endif
 284
 285static int lz4_compress_pages(struct compress_ctx *cc)
 286{
 287        int len;
 288
 289#ifdef CONFIG_F2FS_FS_LZ4HC
 290        return lz4hc_compress_pages(cc);
 291#endif
 292        len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 293                                                cc->clen, cc->private);
 294        if (!len)
 295                return -EAGAIN;
 296
 297        cc->clen = len;
 298        return 0;
 299}
 300
 301static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 302{
 303        int ret;
 304
 305        ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 306                                                dic->clen, dic->rlen);
 307        if (ret < 0) {
 308                printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 309                                KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 310                return -EIO;
 311        }
 312
 313        if (ret != PAGE_SIZE << dic->log_cluster_size) {
 314                printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
 315                                        "expected:%lu\n", KERN_ERR,
 316                                        F2FS_I_SB(dic->inode)->sb->s_id,
 317                                        dic->rlen,
 318                                        PAGE_SIZE << dic->log_cluster_size);
 319                return -EIO;
 320        }
 321        return 0;
 322}
 323
 324static const struct f2fs_compress_ops f2fs_lz4_ops = {
 325        .init_compress_ctx      = lz4_init_compress_ctx,
 326        .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 327        .compress_pages         = lz4_compress_pages,
 328        .decompress_pages       = lz4_decompress_pages,
 329};
 330#endif
 331
 332#ifdef CONFIG_F2FS_FS_ZSTD
 333#define F2FS_ZSTD_DEFAULT_CLEVEL        1
 334
 335static int zstd_init_compress_ctx(struct compress_ctx *cc)
 336{
 337        ZSTD_parameters params;
 338        ZSTD_CStream *stream;
 339        void *workspace;
 340        unsigned int workspace_size;
 341        unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
 342                                                COMPRESS_LEVEL_OFFSET;
 343
 344        if (!level)
 345                level = F2FS_ZSTD_DEFAULT_CLEVEL;
 346
 347        params = ZSTD_getParams(level, cc->rlen, 0);
 348        workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
 349
 350        workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 351                                        workspace_size, GFP_NOFS);
 352        if (!workspace)
 353                return -ENOMEM;
 354
 355        stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
 356        if (!stream) {
 357                printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
 358                                KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 359                                __func__);
 360                kvfree(workspace);
 361                return -EIO;
 362        }
 363
 364        cc->private = workspace;
 365        cc->private2 = stream;
 366
 367        cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 368        return 0;
 369}
 370
 371static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 372{
 373        kvfree(cc->private);
 374        cc->private = NULL;
 375        cc->private2 = NULL;
 376}
 377
 378static int zstd_compress_pages(struct compress_ctx *cc)
 379{
 380        ZSTD_CStream *stream = cc->private2;
 381        ZSTD_inBuffer inbuf;
 382        ZSTD_outBuffer outbuf;
 383        int src_size = cc->rlen;
 384        int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 385        int ret;
 386
 387        inbuf.pos = 0;
 388        inbuf.src = cc->rbuf;
 389        inbuf.size = src_size;
 390
 391        outbuf.pos = 0;
 392        outbuf.dst = cc->cbuf->cdata;
 393        outbuf.size = dst_size;
 394
 395        ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
 396        if (ZSTD_isError(ret)) {
 397                printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 398                                KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 399                                __func__, ZSTD_getErrorCode(ret));
 400                return -EIO;
 401        }
 402
 403        ret = ZSTD_endStream(stream, &outbuf);
 404        if (ZSTD_isError(ret)) {
 405                printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
 406                                KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 407                                __func__, ZSTD_getErrorCode(ret));
 408                return -EIO;
 409        }
 410
 411        /*
 412         * there is compressed data remained in intermediate buffer due to
 413         * no more space in cbuf.cdata
 414         */
 415        if (ret)
 416                return -EAGAIN;
 417
 418        cc->clen = outbuf.pos;
 419        return 0;
 420}
 421
 422static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 423{
 424        ZSTD_DStream *stream;
 425        void *workspace;
 426        unsigned int workspace_size;
 427        unsigned int max_window_size =
 428                        MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 429
 430        workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
 431
 432        workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 433                                        workspace_size, GFP_NOFS);
 434        if (!workspace)
 435                return -ENOMEM;
 436
 437        stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
 438        if (!stream) {
 439                printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
 440                                KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 441                                __func__);
 442                kvfree(workspace);
 443                return -EIO;
 444        }
 445
 446        dic->private = workspace;
 447        dic->private2 = stream;
 448
 449        return 0;
 450}
 451
 452static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 453{
 454        kvfree(dic->private);
 455        dic->private = NULL;
 456        dic->private2 = NULL;
 457}
 458
 459static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 460{
 461        ZSTD_DStream *stream = dic->private2;
 462        ZSTD_inBuffer inbuf;
 463        ZSTD_outBuffer outbuf;
 464        int ret;
 465
 466        inbuf.pos = 0;
 467        inbuf.src = dic->cbuf->cdata;
 468        inbuf.size = dic->clen;
 469
 470        outbuf.pos = 0;
 471        outbuf.dst = dic->rbuf;
 472        outbuf.size = dic->rlen;
 473
 474        ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
 475        if (ZSTD_isError(ret)) {
 476                printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 477                                KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 478                                __func__, ZSTD_getErrorCode(ret));
 479                return -EIO;
 480        }
 481
 482        if (dic->rlen != outbuf.pos) {
 483                printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 484                                "expected:%lu\n", KERN_ERR,
 485                                F2FS_I_SB(dic->inode)->sb->s_id,
 486                                __func__, dic->rlen,
 487                                PAGE_SIZE << dic->log_cluster_size);
 488                return -EIO;
 489        }
 490
 491        return 0;
 492}
 493
 494static const struct f2fs_compress_ops f2fs_zstd_ops = {
 495        .init_compress_ctx      = zstd_init_compress_ctx,
 496        .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 497        .compress_pages         = zstd_compress_pages,
 498        .init_decompress_ctx    = zstd_init_decompress_ctx,
 499        .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 500        .decompress_pages       = zstd_decompress_pages,
 501};
 502#endif
 503
 504#ifdef CONFIG_F2FS_FS_LZO
 505#ifdef CONFIG_F2FS_FS_LZORLE
 506static int lzorle_compress_pages(struct compress_ctx *cc)
 507{
 508        int ret;
 509
 510        ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 511                                        &cc->clen, cc->private);
 512        if (ret != LZO_E_OK) {
 513                printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
 514                                KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 515                return -EIO;
 516        }
 517        return 0;
 518}
 519
 520static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 521        .init_compress_ctx      = lzo_init_compress_ctx,
 522        .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 523        .compress_pages         = lzorle_compress_pages,
 524        .decompress_pages       = lzo_decompress_pages,
 525};
 526#endif
 527#endif
 528
 529static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 530#ifdef CONFIG_F2FS_FS_LZO
 531        &f2fs_lzo_ops,
 532#else
 533        NULL,
 534#endif
 535#ifdef CONFIG_F2FS_FS_LZ4
 536        &f2fs_lz4_ops,
 537#else
 538        NULL,
 539#endif
 540#ifdef CONFIG_F2FS_FS_ZSTD
 541        &f2fs_zstd_ops,
 542#else
 543        NULL,
 544#endif
 545#if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 546        &f2fs_lzorle_ops,
 547#else
 548        NULL,
 549#endif
 550};
 551
 552bool f2fs_is_compress_backend_ready(struct inode *inode)
 553{
 554        if (!f2fs_compressed_file(inode))
 555                return true;
 556        return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 557}
 558
 559static mempool_t *compress_page_pool;
 560static int num_compress_pages = 512;
 561module_param(num_compress_pages, uint, 0444);
 562MODULE_PARM_DESC(num_compress_pages,
 563                "Number of intermediate compress pages to preallocate");
 564
 565int f2fs_init_compress_mempool(void)
 566{
 567        compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 568        if (!compress_page_pool)
 569                return -ENOMEM;
 570
 571        return 0;
 572}
 573
 574void f2fs_destroy_compress_mempool(void)
 575{
 576        mempool_destroy(compress_page_pool);
 577}
 578
 579static struct page *f2fs_compress_alloc_page(void)
 580{
 581        struct page *page;
 582
 583        page = mempool_alloc(compress_page_pool, GFP_NOFS);
 584        lock_page(page);
 585
 586        return page;
 587}
 588
 589static void f2fs_compress_free_page(struct page *page)
 590{
 591        if (!page)
 592                return;
 593        detach_page_private(page);
 594        page->mapping = NULL;
 595        unlock_page(page);
 596        mempool_free(page, compress_page_pool);
 597}
 598
 599#define MAX_VMAP_RETRIES        3
 600
 601static void *f2fs_vmap(struct page **pages, unsigned int count)
 602{
 603        int i;
 604        void *buf = NULL;
 605
 606        for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 607                buf = vm_map_ram(pages, count, -1);
 608                if (buf)
 609                        break;
 610                vm_unmap_aliases();
 611        }
 612        return buf;
 613}
 614
 615static int f2fs_compress_pages(struct compress_ctx *cc)
 616{
 617        struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 618        const struct f2fs_compress_ops *cops =
 619                                f2fs_cops[fi->i_compress_algorithm];
 620        unsigned int max_len, new_nr_cpages;
 621        struct page **new_cpages;
 622        u32 chksum = 0;
 623        int i, ret;
 624
 625        trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 626                                cc->cluster_size, fi->i_compress_algorithm);
 627
 628        if (cops->init_compress_ctx) {
 629                ret = cops->init_compress_ctx(cc);
 630                if (ret)
 631                        goto out;
 632        }
 633
 634        max_len = COMPRESS_HEADER_SIZE + cc->clen;
 635        cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 636
 637        cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 638        if (!cc->cpages) {
 639                ret = -ENOMEM;
 640                goto destroy_compress_ctx;
 641        }
 642
 643        for (i = 0; i < cc->nr_cpages; i++) {
 644                cc->cpages[i] = f2fs_compress_alloc_page();
 645                if (!cc->cpages[i]) {
 646                        ret = -ENOMEM;
 647                        goto out_free_cpages;
 648                }
 649        }
 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 & 1 << COMPRESS_CHKSUM)
 677                chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
 678                                        cc->cbuf->cdata, cc->clen);
 679        cc->cbuf->chksum = cpu_to_le32(chksum);
 680
 681        for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 682                cc->cbuf->reserved[i] = cpu_to_le32(0);
 683
 684        new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 685
 686        /* Now we're going to cut unnecessary tail pages */
 687        new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
 688        if (!new_cpages) {
 689                ret = -ENOMEM;
 690                goto out_vunmap_cbuf;
 691        }
 692
 693        /* zero out any unused part of the last page */
 694        memset(&cc->cbuf->cdata[cc->clen], 0,
 695                        (new_nr_cpages * PAGE_SIZE) -
 696                        (cc->clen + COMPRESS_HEADER_SIZE));
 697
 698        vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 699        vm_unmap_ram(cc->rbuf, cc->cluster_size);
 700
 701        for (i = 0; i < cc->nr_cpages; i++) {
 702                if (i < new_nr_cpages) {
 703                        new_cpages[i] = cc->cpages[i];
 704                        continue;
 705                }
 706                f2fs_compress_free_page(cc->cpages[i]);
 707                cc->cpages[i] = NULL;
 708        }
 709
 710        if (cops->destroy_compress_ctx)
 711                cops->destroy_compress_ctx(cc);
 712
 713        page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 714        cc->cpages = new_cpages;
 715        cc->nr_cpages = new_nr_cpages;
 716
 717        trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 718                                                        cc->clen, ret);
 719        return 0;
 720
 721out_vunmap_cbuf:
 722        vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 723out_vunmap_rbuf:
 724        vm_unmap_ram(cc->rbuf, cc->cluster_size);
 725out_free_cpages:
 726        for (i = 0; i < cc->nr_cpages; i++) {
 727                if (cc->cpages[i])
 728                        f2fs_compress_free_page(cc->cpages[i]);
 729        }
 730        page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 731        cc->cpages = NULL;
 732destroy_compress_ctx:
 733        if (cops->destroy_compress_ctx)
 734                cops->destroy_compress_ctx(cc);
 735out:
 736        trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 737                                                        cc->clen, ret);
 738        return ret;
 739}
 740
 741void f2fs_decompress_cluster(struct decompress_io_ctx *dic)
 742{
 743        struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 744        struct f2fs_inode_info *fi = F2FS_I(dic->inode);
 745        const struct f2fs_compress_ops *cops =
 746                        f2fs_cops[fi->i_compress_algorithm];
 747        int ret;
 748        int i;
 749
 750        trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 751                                dic->cluster_size, fi->i_compress_algorithm);
 752
 753        if (dic->failed) {
 754                ret = -EIO;
 755                goto out_end_io;
 756        }
 757
 758        dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
 759        if (!dic->tpages) {
 760                ret = -ENOMEM;
 761                goto out_end_io;
 762        }
 763
 764        for (i = 0; i < dic->cluster_size; i++) {
 765                if (dic->rpages[i]) {
 766                        dic->tpages[i] = dic->rpages[i];
 767                        continue;
 768                }
 769
 770                dic->tpages[i] = f2fs_compress_alloc_page();
 771                if (!dic->tpages[i]) {
 772                        ret = -ENOMEM;
 773                        goto out_end_io;
 774                }
 775        }
 776
 777        if (cops->init_decompress_ctx) {
 778                ret = cops->init_decompress_ctx(dic);
 779                if (ret)
 780                        goto out_end_io;
 781        }
 782
 783        dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
 784        if (!dic->rbuf) {
 785                ret = -ENOMEM;
 786                goto out_destroy_decompress_ctx;
 787        }
 788
 789        dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
 790        if (!dic->cbuf) {
 791                ret = -ENOMEM;
 792                goto out_vunmap_rbuf;
 793        }
 794
 795        dic->clen = le32_to_cpu(dic->cbuf->clen);
 796        dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 797
 798        if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 799                ret = -EFSCORRUPTED;
 800                goto out_vunmap_cbuf;
 801        }
 802
 803        ret = cops->decompress_pages(dic);
 804
 805        if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
 806                u32 provided = le32_to_cpu(dic->cbuf->chksum);
 807                u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
 808
 809                if (provided != calculated) {
 810                        if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 811                                set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 812                                printk_ratelimited(
 813                                        "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
 814                                        KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
 815                                        provided, calculated);
 816                        }
 817                        set_sbi_flag(sbi, SBI_NEED_FSCK);
 818                }
 819        }
 820
 821out_vunmap_cbuf:
 822        vm_unmap_ram(dic->cbuf, dic->nr_cpages);
 823out_vunmap_rbuf:
 824        vm_unmap_ram(dic->rbuf, dic->cluster_size);
 825out_destroy_decompress_ctx:
 826        if (cops->destroy_decompress_ctx)
 827                cops->destroy_decompress_ctx(dic);
 828out_end_io:
 829        trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 830                                                        dic->clen, ret);
 831        f2fs_decompress_end_io(dic, ret);
 832}
 833
 834/*
 835 * This is called when a page of a compressed cluster has been read from disk
 836 * (or failed to be read from disk).  It checks whether this page was the last
 837 * page being waited on in the cluster, and if so, it decompresses the cluster
 838 * (or in the case of a failure, cleans up without actually decompressing).
 839 */
 840void f2fs_end_read_compressed_page(struct page *page, bool failed,
 841                                                block_t blkaddr)
 842{
 843        struct decompress_io_ctx *dic =
 844                        (struct decompress_io_ctx *)page_private(page);
 845        struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 846
 847        dec_page_count(sbi, F2FS_RD_DATA);
 848
 849        if (failed)
 850                WRITE_ONCE(dic->failed, true);
 851        else if (blkaddr)
 852                f2fs_cache_compressed_page(sbi, page,
 853                                        dic->inode->i_ino, blkaddr);
 854
 855        if (atomic_dec_and_test(&dic->remaining_pages))
 856                f2fs_decompress_cluster(dic);
 857}
 858
 859static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 860{
 861        if (cc->cluster_idx == NULL_CLUSTER)
 862                return true;
 863        return cc->cluster_idx == cluster_idx(cc, index);
 864}
 865
 866bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 867{
 868        return cc->nr_rpages == 0;
 869}
 870
 871static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 872{
 873        return cc->cluster_size == cc->nr_rpages;
 874}
 875
 876bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 877{
 878        if (f2fs_cluster_is_empty(cc))
 879                return true;
 880        return is_page_in_cluster(cc, index);
 881}
 882
 883static bool cluster_has_invalid_data(struct compress_ctx *cc)
 884{
 885        loff_t i_size = i_size_read(cc->inode);
 886        unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 887        int i;
 888
 889        for (i = 0; i < cc->cluster_size; i++) {
 890                struct page *page = cc->rpages[i];
 891
 892                f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
 893
 894                /* beyond EOF */
 895                if (page->index >= nr_pages)
 896                        return true;
 897        }
 898        return false;
 899}
 900
 901static int __f2fs_cluster_blocks(struct inode *inode,
 902                                unsigned int cluster_idx, bool compr)
 903{
 904        struct dnode_of_data dn;
 905        unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
 906        unsigned int start_idx = cluster_idx <<
 907                                F2FS_I(inode)->i_log_cluster_size;
 908        int ret;
 909
 910        set_new_dnode(&dn, inode, NULL, NULL, 0);
 911        ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
 912        if (ret) {
 913                if (ret == -ENOENT)
 914                        ret = 0;
 915                goto fail;
 916        }
 917
 918        if (dn.data_blkaddr == COMPRESS_ADDR) {
 919                int i;
 920
 921                ret = 1;
 922                for (i = 1; i < cluster_size; i++) {
 923                        block_t blkaddr;
 924
 925                        blkaddr = data_blkaddr(dn.inode,
 926                                        dn.node_page, dn.ofs_in_node + i);
 927                        if (compr) {
 928                                if (__is_valid_data_blkaddr(blkaddr))
 929                                        ret++;
 930                        } else {
 931                                if (blkaddr != NULL_ADDR)
 932                                        ret++;
 933                        }
 934                }
 935
 936                f2fs_bug_on(F2FS_I_SB(inode),
 937                        !compr && ret != cluster_size &&
 938                        !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
 939        }
 940fail:
 941        f2fs_put_dnode(&dn);
 942        return ret;
 943}
 944
 945/* return # of compressed blocks in compressed cluster */
 946static int f2fs_compressed_blocks(struct compress_ctx *cc)
 947{
 948        return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
 949}
 950
 951/* return # of valid blocks in compressed cluster */
 952int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 953{
 954        return __f2fs_cluster_blocks(inode,
 955                index >> F2FS_I(inode)->i_log_cluster_size,
 956                false);
 957}
 958
 959static bool cluster_may_compress(struct compress_ctx *cc)
 960{
 961        if (!f2fs_need_compress_data(cc->inode))
 962                return false;
 963        if (f2fs_is_atomic_file(cc->inode))
 964                return false;
 965        if (!f2fs_cluster_is_full(cc))
 966                return false;
 967        if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
 968                return false;
 969        return !cluster_has_invalid_data(cc);
 970}
 971
 972static void set_cluster_writeback(struct compress_ctx *cc)
 973{
 974        int i;
 975
 976        for (i = 0; i < cc->cluster_size; i++) {
 977                if (cc->rpages[i])
 978                        set_page_writeback(cc->rpages[i]);
 979        }
 980}
 981
 982static void set_cluster_dirty(struct compress_ctx *cc)
 983{
 984        int i;
 985
 986        for (i = 0; i < cc->cluster_size; i++)
 987                if (cc->rpages[i])
 988                        set_page_dirty(cc->rpages[i]);
 989}
 990
 991static int prepare_compress_overwrite(struct compress_ctx *cc,
 992                struct page **pagep, pgoff_t index, void **fsdata)
 993{
 994        struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 995        struct address_space *mapping = cc->inode->i_mapping;
 996        struct page *page;
 997        sector_t last_block_in_bio;
 998        unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
 999        pgoff_t start_idx = start_idx_of_cluster(cc);
1000        int i, ret;
1001
1002retry:
1003        ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
1004        if (ret <= 0)
1005                return ret;
1006
1007        ret = f2fs_init_compress_ctx(cc);
1008        if (ret)
1009                return ret;
1010
1011        /* keep page reference to avoid page reclaim */
1012        for (i = 0; i < cc->cluster_size; i++) {
1013                page = f2fs_pagecache_get_page(mapping, start_idx + i,
1014                                                        fgp_flag, GFP_NOFS);
1015                if (!page) {
1016                        ret = -ENOMEM;
1017                        goto unlock_pages;
1018                }
1019
1020                if (PageUptodate(page))
1021                        f2fs_put_page(page, 1);
1022                else
1023                        f2fs_compress_ctx_add_page(cc, page);
1024        }
1025
1026        if (!f2fs_cluster_is_empty(cc)) {
1027                struct bio *bio = NULL;
1028
1029                ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1030                                        &last_block_in_bio, false, true);
1031                f2fs_put_rpages(cc);
1032                f2fs_destroy_compress_ctx(cc, true);
1033                if (ret)
1034                        goto out;
1035                if (bio)
1036                        f2fs_submit_bio(sbi, bio, DATA);
1037
1038                ret = f2fs_init_compress_ctx(cc);
1039                if (ret)
1040                        goto out;
1041        }
1042
1043        for (i = 0; i < cc->cluster_size; i++) {
1044                f2fs_bug_on(sbi, cc->rpages[i]);
1045
1046                page = find_lock_page(mapping, start_idx + i);
1047                if (!page) {
1048                        /* page can be truncated */
1049                        goto release_and_retry;
1050                }
1051
1052                f2fs_wait_on_page_writeback(page, DATA, true, true);
1053                f2fs_compress_ctx_add_page(cc, page);
1054
1055                if (!PageUptodate(page)) {
1056release_and_retry:
1057                        f2fs_put_rpages(cc);
1058                        f2fs_unlock_rpages(cc, i + 1);
1059                        f2fs_destroy_compress_ctx(cc, true);
1060                        goto retry;
1061                }
1062        }
1063
1064        if (likely(!ret)) {
1065                *fsdata = cc->rpages;
1066                *pagep = cc->rpages[offset_in_cluster(cc, index)];
1067                return cc->cluster_size;
1068        }
1069
1070unlock_pages:
1071        f2fs_put_rpages(cc);
1072        f2fs_unlock_rpages(cc, i);
1073        f2fs_destroy_compress_ctx(cc, true);
1074out:
1075        return ret;
1076}
1077
1078int f2fs_prepare_compress_overwrite(struct inode *inode,
1079                struct page **pagep, pgoff_t index, void **fsdata)
1080{
1081        struct compress_ctx cc = {
1082                .inode = inode,
1083                .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1084                .cluster_size = F2FS_I(inode)->i_cluster_size,
1085                .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1086                .rpages = NULL,
1087                .nr_rpages = 0,
1088        };
1089
1090        return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1091}
1092
1093bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1094                                        pgoff_t index, unsigned copied)
1095
1096{
1097        struct compress_ctx cc = {
1098                .inode = inode,
1099                .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1100                .cluster_size = F2FS_I(inode)->i_cluster_size,
1101                .rpages = fsdata,
1102        };
1103        bool first_index = (index == cc.rpages[0]->index);
1104
1105        if (copied)
1106                set_cluster_dirty(&cc);
1107
1108        f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1109        f2fs_destroy_compress_ctx(&cc, false);
1110
1111        return first_index;
1112}
1113
1114int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1115{
1116        void *fsdata = NULL;
1117        struct page *pagep;
1118        int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1119        pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1120                                                        log_cluster_size;
1121        int err;
1122
1123        err = f2fs_is_compressed_cluster(inode, start_idx);
1124        if (err < 0)
1125                return err;
1126
1127        /* truncate normal cluster */
1128        if (!err)
1129                return f2fs_do_truncate_blocks(inode, from, lock);
1130
1131        /* truncate compressed cluster */
1132        err = f2fs_prepare_compress_overwrite(inode, &pagep,
1133                                                start_idx, &fsdata);
1134
1135        /* should not be a normal cluster */
1136        f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1137
1138        if (err <= 0)
1139                return err;
1140
1141        if (err > 0) {
1142                struct page **rpages = fsdata;
1143                int cluster_size = F2FS_I(inode)->i_cluster_size;
1144                int i;
1145
1146                for (i = cluster_size - 1; i >= 0; i--) {
1147                        loff_t start = rpages[i]->index << PAGE_SHIFT;
1148
1149                        if (from <= start) {
1150                                zero_user_segment(rpages[i], 0, PAGE_SIZE);
1151                        } else {
1152                                zero_user_segment(rpages[i], from - start,
1153                                                                PAGE_SIZE);
1154                                break;
1155                        }
1156                }
1157
1158                f2fs_compress_write_end(inode, fsdata, start_idx, true);
1159        }
1160        return 0;
1161}
1162
1163static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1164                                        int *submitted,
1165                                        struct writeback_control *wbc,
1166                                        enum iostat_type io_type)
1167{
1168        struct inode *inode = cc->inode;
1169        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1170        struct f2fs_inode_info *fi = F2FS_I(inode);
1171        struct f2fs_io_info fio = {
1172                .sbi = sbi,
1173                .ino = cc->inode->i_ino,
1174                .type = DATA,
1175                .op = REQ_OP_WRITE,
1176                .op_flags = wbc_to_write_flags(wbc),
1177                .old_blkaddr = NEW_ADDR,
1178                .page = NULL,
1179                .encrypted_page = NULL,
1180                .compressed_page = NULL,
1181                .submitted = false,
1182                .io_type = io_type,
1183                .io_wbc = wbc,
1184                .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1185        };
1186        struct dnode_of_data dn;
1187        struct node_info ni;
1188        struct compress_io_ctx *cic;
1189        pgoff_t start_idx = start_idx_of_cluster(cc);
1190        unsigned int last_index = cc->cluster_size - 1;
1191        loff_t psize;
1192        int i, err;
1193
1194        /* we should bypass data pages to proceed the kworkder jobs */
1195        if (unlikely(f2fs_cp_error(sbi))) {
1196                mapping_set_error(cc->rpages[0]->mapping, -EIO);
1197                goto out_free;
1198        }
1199
1200        if (IS_NOQUOTA(inode)) {
1201                /*
1202                 * We need to wait for node_write to avoid block allocation during
1203                 * checkpoint. This can only happen to quota writes which can cause
1204                 * the below discard race condition.
1205                 */
1206                down_read(&sbi->node_write);
1207        } else if (!f2fs_trylock_op(sbi)) {
1208                goto out_free;
1209        }
1210
1211        set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1212
1213        err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1214        if (err)
1215                goto out_unlock_op;
1216
1217        for (i = 0; i < cc->cluster_size; i++) {
1218                if (data_blkaddr(dn.inode, dn.node_page,
1219                                        dn.ofs_in_node + i) == NULL_ADDR)
1220                        goto out_put_dnode;
1221        }
1222
1223        psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1224
1225        err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1226        if (err)
1227                goto out_put_dnode;
1228
1229        fio.version = ni.version;
1230
1231        cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1232        if (!cic)
1233                goto out_put_dnode;
1234
1235        cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1236        cic->inode = inode;
1237        atomic_set(&cic->pending_pages, cc->nr_cpages);
1238        cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1239        if (!cic->rpages)
1240                goto out_put_cic;
1241
1242        cic->nr_rpages = cc->cluster_size;
1243
1244        for (i = 0; i < cc->nr_cpages; i++) {
1245                f2fs_set_compressed_page(cc->cpages[i], inode,
1246                                        cc->rpages[i + 1]->index, cic);
1247                fio.compressed_page = cc->cpages[i];
1248
1249                fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1250                                                dn.ofs_in_node + i + 1);
1251
1252                /* wait for GCed page writeback via META_MAPPING */
1253                f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1254
1255                if (fio.encrypted) {
1256                        fio.page = cc->rpages[i + 1];
1257                        err = f2fs_encrypt_one_page(&fio);
1258                        if (err)
1259                                goto out_destroy_crypt;
1260                        cc->cpages[i] = fio.encrypted_page;
1261                }
1262        }
1263
1264        set_cluster_writeback(cc);
1265
1266        for (i = 0; i < cc->cluster_size; i++)
1267                cic->rpages[i] = cc->rpages[i];
1268
1269        for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1270                block_t blkaddr;
1271
1272                blkaddr = f2fs_data_blkaddr(&dn);
1273                fio.page = cc->rpages[i];
1274                fio.old_blkaddr = blkaddr;
1275
1276                /* cluster header */
1277                if (i == 0) {
1278                        if (blkaddr == COMPRESS_ADDR)
1279                                fio.compr_blocks++;
1280                        if (__is_valid_data_blkaddr(blkaddr))
1281                                f2fs_invalidate_blocks(sbi, blkaddr);
1282                        f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1283                        goto unlock_continue;
1284                }
1285
1286                if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1287                        fio.compr_blocks++;
1288
1289                if (i > cc->nr_cpages) {
1290                        if (__is_valid_data_blkaddr(blkaddr)) {
1291                                f2fs_invalidate_blocks(sbi, blkaddr);
1292                                f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1293                        }
1294                        goto unlock_continue;
1295                }
1296
1297                f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1298
1299                if (fio.encrypted)
1300                        fio.encrypted_page = cc->cpages[i - 1];
1301                else
1302                        fio.compressed_page = cc->cpages[i - 1];
1303
1304                cc->cpages[i - 1] = NULL;
1305                f2fs_outplace_write_data(&dn, &fio);
1306                (*submitted)++;
1307unlock_continue:
1308                inode_dec_dirty_pages(cc->inode);
1309                unlock_page(fio.page);
1310        }
1311
1312        if (fio.compr_blocks)
1313                f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1314        f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1315        add_compr_block_stat(inode, cc->nr_cpages);
1316
1317        set_inode_flag(cc->inode, FI_APPEND_WRITE);
1318        if (cc->cluster_idx == 0)
1319                set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1320
1321        f2fs_put_dnode(&dn);
1322        if (IS_NOQUOTA(inode))
1323                up_read(&sbi->node_write);
1324        else
1325                f2fs_unlock_op(sbi);
1326
1327        spin_lock(&fi->i_size_lock);
1328        if (fi->last_disk_size < psize)
1329                fi->last_disk_size = psize;
1330        spin_unlock(&fi->i_size_lock);
1331
1332        f2fs_put_rpages(cc);
1333        page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1334        cc->cpages = NULL;
1335        f2fs_destroy_compress_ctx(cc, false);
1336        return 0;
1337
1338out_destroy_crypt:
1339        page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1340
1341        for (--i; i >= 0; i--)
1342                fscrypt_finalize_bounce_page(&cc->cpages[i]);
1343        for (i = 0; i < cc->nr_cpages; i++) {
1344                if (!cc->cpages[i])
1345                        continue;
1346                f2fs_compress_free_page(cc->cpages[i]);
1347                cc->cpages[i] = NULL;
1348        }
1349out_put_cic:
1350        kmem_cache_free(cic_entry_slab, cic);
1351out_put_dnode:
1352        f2fs_put_dnode(&dn);
1353out_unlock_op:
1354        if (IS_NOQUOTA(inode))
1355                up_read(&sbi->node_write);
1356        else
1357                f2fs_unlock_op(sbi);
1358out_free:
1359        page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1360        cc->cpages = NULL;
1361        return -EAGAIN;
1362}
1363
1364void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1365{
1366        struct f2fs_sb_info *sbi = bio->bi_private;
1367        struct compress_io_ctx *cic =
1368                        (struct compress_io_ctx *)page_private(page);
1369        int i;
1370
1371        if (unlikely(bio->bi_status))
1372                mapping_set_error(cic->inode->i_mapping, -EIO);
1373
1374        f2fs_compress_free_page(page);
1375
1376        dec_page_count(sbi, F2FS_WB_DATA);
1377
1378        if (atomic_dec_return(&cic->pending_pages))
1379                return;
1380
1381        for (i = 0; i < cic->nr_rpages; i++) {
1382                WARN_ON(!cic->rpages[i]);
1383                clear_page_private_gcing(cic->rpages[i]);
1384                end_page_writeback(cic->rpages[i]);
1385        }
1386
1387        page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1388        kmem_cache_free(cic_entry_slab, cic);
1389}
1390
1391static int f2fs_write_raw_pages(struct compress_ctx *cc,
1392                                        int *submitted,
1393                                        struct writeback_control *wbc,
1394                                        enum iostat_type io_type)
1395{
1396        struct address_space *mapping = cc->inode->i_mapping;
1397        int _submitted, compr_blocks, ret;
1398        int i = -1, err = 0;
1399
1400        compr_blocks = f2fs_compressed_blocks(cc);
1401        if (compr_blocks < 0) {
1402                err = compr_blocks;
1403                goto out_err;
1404        }
1405
1406        for (i = 0; i < cc->cluster_size; i++) {
1407                if (!cc->rpages[i])
1408                        continue;
1409retry_write:
1410                if (cc->rpages[i]->mapping != mapping) {
1411                        unlock_page(cc->rpages[i]);
1412                        continue;
1413                }
1414
1415                BUG_ON(!PageLocked(cc->rpages[i]));
1416
1417                ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1418                                                NULL, NULL, wbc, io_type,
1419                                                compr_blocks, false);
1420                if (ret) {
1421                        if (ret == AOP_WRITEPAGE_ACTIVATE) {
1422                                unlock_page(cc->rpages[i]);
1423                                ret = 0;
1424                        } else if (ret == -EAGAIN) {
1425                                /*
1426                                 * for quota file, just redirty left pages to
1427                                 * avoid deadlock caused by cluster update race
1428                                 * from foreground operation.
1429                                 */
1430                                if (IS_NOQUOTA(cc->inode)) {
1431                                        err = 0;
1432                                        goto out_err;
1433                                }
1434                                ret = 0;
1435                                cond_resched();
1436                                congestion_wait(BLK_RW_ASYNC,
1437                                                DEFAULT_IO_TIMEOUT);
1438                                lock_page(cc->rpages[i]);
1439
1440                                if (!PageDirty(cc->rpages[i])) {
1441                                        unlock_page(cc->rpages[i]);
1442                                        continue;
1443                                }
1444
1445                                clear_page_dirty_for_io(cc->rpages[i]);
1446                                goto retry_write;
1447                        }
1448                        err = ret;
1449                        goto out_err;
1450                }
1451
1452                *submitted += _submitted;
1453        }
1454
1455        f2fs_balance_fs(F2FS_M_SB(mapping), true);
1456
1457        return 0;
1458out_err:
1459        for (++i; i < cc->cluster_size; i++) {
1460                if (!cc->rpages[i])
1461                        continue;
1462                redirty_page_for_writepage(wbc, cc->rpages[i]);
1463                unlock_page(cc->rpages[i]);
1464        }
1465        return err;
1466}
1467
1468int f2fs_write_multi_pages(struct compress_ctx *cc,
1469                                        int *submitted,
1470                                        struct writeback_control *wbc,
1471                                        enum iostat_type io_type)
1472{
1473        int err;
1474
1475        *submitted = 0;
1476        if (cluster_may_compress(cc)) {
1477                err = f2fs_compress_pages(cc);
1478                if (err == -EAGAIN) {
1479                        goto write;
1480                } else if (err) {
1481                        f2fs_put_rpages_wbc(cc, wbc, true, 1);
1482                        goto destroy_out;
1483                }
1484
1485                err = f2fs_write_compressed_pages(cc, submitted,
1486                                                        wbc, io_type);
1487                if (!err)
1488                        return 0;
1489                f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1490        }
1491write:
1492        f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1493
1494        err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1495        f2fs_put_rpages_wbc(cc, wbc, false, 0);
1496destroy_out:
1497        f2fs_destroy_compress_ctx(cc, false);
1498        return err;
1499}
1500
1501static void f2fs_free_dic(struct decompress_io_ctx *dic);
1502
1503struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1504{
1505        struct decompress_io_ctx *dic;
1506        pgoff_t start_idx = start_idx_of_cluster(cc);
1507        int i;
1508
1509        dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1510        if (!dic)
1511                return ERR_PTR(-ENOMEM);
1512
1513        dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1514        if (!dic->rpages) {
1515                kmem_cache_free(dic_entry_slab, dic);
1516                return ERR_PTR(-ENOMEM);
1517        }
1518
1519        dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1520        dic->inode = cc->inode;
1521        atomic_set(&dic->remaining_pages, cc->nr_cpages);
1522        dic->cluster_idx = cc->cluster_idx;
1523        dic->cluster_size = cc->cluster_size;
1524        dic->log_cluster_size = cc->log_cluster_size;
1525        dic->nr_cpages = cc->nr_cpages;
1526        refcount_set(&dic->refcnt, 1);
1527        dic->failed = false;
1528        dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1529
1530        for (i = 0; i < dic->cluster_size; i++)
1531                dic->rpages[i] = cc->rpages[i];
1532        dic->nr_rpages = cc->cluster_size;
1533
1534        dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1535        if (!dic->cpages)
1536                goto out_free;
1537
1538        for (i = 0; i < dic->nr_cpages; i++) {
1539                struct page *page;
1540
1541                page = f2fs_compress_alloc_page();
1542                if (!page)
1543                        goto out_free;
1544
1545                f2fs_set_compressed_page(page, cc->inode,
1546                                        start_idx + i + 1, dic);
1547                dic->cpages[i] = page;
1548        }
1549
1550        return dic;
1551
1552out_free:
1553        f2fs_free_dic(dic);
1554        return ERR_PTR(-ENOMEM);
1555}
1556
1557static void f2fs_free_dic(struct decompress_io_ctx *dic)
1558{
1559        int i;
1560
1561        if (dic->tpages) {
1562                for (i = 0; i < dic->cluster_size; i++) {
1563                        if (dic->rpages[i])
1564                                continue;
1565                        if (!dic->tpages[i])
1566                                continue;
1567                        f2fs_compress_free_page(dic->tpages[i]);
1568                }
1569                page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1570        }
1571
1572        if (dic->cpages) {
1573                for (i = 0; i < dic->nr_cpages; i++) {
1574                        if (!dic->cpages[i])
1575                                continue;
1576                        f2fs_compress_free_page(dic->cpages[i]);
1577                }
1578                page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1579        }
1580
1581        page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1582        kmem_cache_free(dic_entry_slab, dic);
1583}
1584
1585static void f2fs_put_dic(struct decompress_io_ctx *dic)
1586{
1587        if (refcount_dec_and_test(&dic->refcnt))
1588                f2fs_free_dic(dic);
1589}
1590
1591/*
1592 * Update and unlock the cluster's pagecache pages, and release the reference to
1593 * the decompress_io_ctx that was being held for I/O completion.
1594 */
1595static void __f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed)
1596{
1597        int i;
1598
1599        for (i = 0; i < dic->cluster_size; i++) {
1600                struct page *rpage = dic->rpages[i];
1601
1602                if (!rpage)
1603                        continue;
1604
1605                /* PG_error was set if verity failed. */
1606                if (failed || PageError(rpage)) {
1607                        ClearPageUptodate(rpage);
1608                        /* will re-read again later */
1609                        ClearPageError(rpage);
1610                } else {
1611                        SetPageUptodate(rpage);
1612                }
1613                unlock_page(rpage);
1614        }
1615
1616        f2fs_put_dic(dic);
1617}
1618
1619static void f2fs_verify_cluster(struct work_struct *work)
1620{
1621        struct decompress_io_ctx *dic =
1622                container_of(work, struct decompress_io_ctx, verity_work);
1623        int i;
1624
1625        /* Verify the cluster's decompressed pages with fs-verity. */
1626        for (i = 0; i < dic->cluster_size; i++) {
1627                struct page *rpage = dic->rpages[i];
1628
1629                if (rpage && !fsverity_verify_page(rpage))
1630                        SetPageError(rpage);
1631        }
1632
1633        __f2fs_decompress_end_io(dic, false);
1634}
1635
1636/*
1637 * This is called when a compressed cluster has been decompressed
1638 * (or failed to be read and/or decompressed).
1639 */
1640void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed)
1641{
1642        if (!failed && dic->need_verity) {
1643                /*
1644                 * Note that to avoid deadlocks, the verity work can't be done
1645                 * on the decompression workqueue.  This is because verifying
1646                 * the data pages can involve reading metadata pages from the
1647                 * file, and these metadata pages may be compressed.
1648                 */
1649                INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1650                fsverity_enqueue_verify_work(&dic->verity_work);
1651        } else {
1652                __f2fs_decompress_end_io(dic, failed);
1653        }
1654}
1655
1656/*
1657 * Put a reference to a compressed page's decompress_io_ctx.
1658 *
1659 * This is called when the page is no longer needed and can be freed.
1660 */
1661void f2fs_put_page_dic(struct page *page)
1662{
1663        struct decompress_io_ctx *dic =
1664                        (struct decompress_io_ctx *)page_private(page);
1665
1666        f2fs_put_dic(dic);
1667}
1668
1669const struct address_space_operations f2fs_compress_aops = {
1670        .releasepage = f2fs_release_page,
1671        .invalidatepage = f2fs_invalidate_page,
1672};
1673
1674struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1675{
1676        return sbi->compress_inode->i_mapping;
1677}
1678
1679void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
1680{
1681        if (!sbi->compress_inode)
1682                return;
1683        invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr);
1684}
1685
1686void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1687                                                nid_t ino, block_t blkaddr)
1688{
1689        struct page *cpage;
1690        int ret;
1691
1692        if (!test_opt(sbi, COMPRESS_CACHE))
1693                return;
1694
1695        if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1696                return;
1697
1698        if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
1699                return;
1700
1701        cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
1702        if (cpage) {
1703                f2fs_put_page(cpage, 0);
1704                return;
1705        }
1706
1707        cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
1708        if (!cpage)
1709                return;
1710
1711        ret = add_to_page_cache_lru(cpage, COMPRESS_MAPPING(sbi),
1712                                                blkaddr, GFP_NOFS);
1713        if (ret) {
1714                f2fs_put_page(cpage, 0);
1715                return;
1716        }
1717
1718        set_page_private_data(cpage, ino);
1719
1720        if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1721                goto out;
1722
1723        memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
1724        SetPageUptodate(cpage);
1725out:
1726        f2fs_put_page(cpage, 1);
1727}
1728
1729bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1730                                                                block_t blkaddr)
1731{
1732        struct page *cpage;
1733        bool hitted = false;
1734
1735        if (!test_opt(sbi, COMPRESS_CACHE))
1736                return false;
1737
1738        cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
1739                                blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1740        if (cpage) {
1741                if (PageUptodate(cpage)) {
1742                        atomic_inc(&sbi->compress_page_hit);
1743                        memcpy(page_address(page),
1744                                page_address(cpage), PAGE_SIZE);
1745                        hitted = true;
1746                }
1747                f2fs_put_page(cpage, 1);
1748        }
1749
1750        return hitted;
1751}
1752
1753void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1754{
1755        struct address_space *mapping = sbi->compress_inode->i_mapping;
1756        struct pagevec pvec;
1757        pgoff_t index = 0;
1758        pgoff_t end = MAX_BLKADDR(sbi);
1759
1760        if (!mapping->nrpages)
1761                return;
1762
1763        pagevec_init(&pvec);
1764
1765        do {
1766                unsigned int nr_pages;
1767                int i;
1768
1769                nr_pages = pagevec_lookup_range(&pvec, mapping,
1770                                                &index, end - 1);
1771                if (!nr_pages)
1772                        break;
1773
1774                for (i = 0; i < nr_pages; i++) {
1775                        struct page *page = pvec.pages[i];
1776
1777                        if (page->index > end)
1778                                break;
1779
1780                        lock_page(page);
1781                        if (page->mapping != mapping) {
1782                                unlock_page(page);
1783                                continue;
1784                        }
1785
1786                        if (ino != get_page_private_data(page)) {
1787                                unlock_page(page);
1788                                continue;
1789                        }
1790
1791                        generic_error_remove_page(mapping, page);
1792                        unlock_page(page);
1793                }
1794                pagevec_release(&pvec);
1795                cond_resched();
1796        } while (index < end);
1797}
1798
1799int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
1800{
1801        struct inode *inode;
1802
1803        if (!test_opt(sbi, COMPRESS_CACHE))
1804                return 0;
1805
1806        inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
1807        if (IS_ERR(inode))
1808                return PTR_ERR(inode);
1809        sbi->compress_inode = inode;
1810
1811        sbi->compress_percent = COMPRESS_PERCENT;
1812        sbi->compress_watermark = COMPRESS_WATERMARK;
1813
1814        atomic_set(&sbi->compress_page_hit, 0);
1815
1816        return 0;
1817}
1818
1819void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
1820{
1821        if (!sbi->compress_inode)
1822                return;
1823        iput(sbi->compress_inode);
1824        sbi->compress_inode = NULL;
1825}
1826
1827int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1828{
1829        dev_t dev = sbi->sb->s_bdev->bd_dev;
1830        char slab_name[32];
1831
1832        sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1833
1834        sbi->page_array_slab_size = sizeof(struct page *) <<
1835                                        F2FS_OPTION(sbi).compress_log_size;
1836
1837        sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1838                                        sbi->page_array_slab_size);
1839        if (!sbi->page_array_slab)
1840                return -ENOMEM;
1841        return 0;
1842}
1843
1844void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1845{
1846        kmem_cache_destroy(sbi->page_array_slab);
1847}
1848
1849static int __init f2fs_init_cic_cache(void)
1850{
1851        cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1852                                        sizeof(struct compress_io_ctx));
1853        if (!cic_entry_slab)
1854                return -ENOMEM;
1855        return 0;
1856}
1857
1858static void f2fs_destroy_cic_cache(void)
1859{
1860        kmem_cache_destroy(cic_entry_slab);
1861}
1862
1863static int __init f2fs_init_dic_cache(void)
1864{
1865        dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1866                                        sizeof(struct decompress_io_ctx));
1867        if (!dic_entry_slab)
1868                return -ENOMEM;
1869        return 0;
1870}
1871
1872static void f2fs_destroy_dic_cache(void)
1873{
1874        kmem_cache_destroy(dic_entry_slab);
1875}
1876
1877int __init f2fs_init_compress_cache(void)
1878{
1879        int err;
1880
1881        err = f2fs_init_cic_cache();
1882        if (err)
1883                goto out;
1884        err = f2fs_init_dic_cache();
1885        if (err)
1886                goto free_cic;
1887        return 0;
1888free_cic:
1889        f2fs_destroy_cic_cache();
1890out:
1891        return -ENOMEM;
1892}
1893
1894void f2fs_destroy_compress_cache(void)
1895{
1896        f2fs_destroy_dic_cache();
1897        f2fs_destroy_cic_cache();
1898}
1899
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