fs/f2fs/compress.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * f2fs compress support
   4  *
   5  * Copyright (c) 2019 Chao Yu <chao@kernel.org>
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/writeback.h>
  11 #include <linux/backing-dev.h>
  12 #include <linux/lzo.h>
  13 #include <linux/lz4.h>
  14 #include <linux/zstd.h>
  15
  16 #include "f2fs.h"
  17 #include "node.h"
  18 #include <trace/events/f2fs.h>
  19
  20 static struct kmem_cache *cic_entry_slab;
  21 static struct kmem_cache *dic_entry_slab;
  22
  23 static void *page_array_alloc(struct inode *inode, int nr)
  24 {
  25         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  26         unsigned int size = sizeof(struct page *) * nr;
  27
  28         if (likely(size <= sbi->page_array_slab_size))
  29                 return kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS);
  30         return f2fs_kzalloc(sbi, size, GFP_NOFS);
  31 }
  32
  33 static void page_array_free(struct inode *inode, void *pages, int nr)
  34 {
  35         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  36         unsigned int size = sizeof(struct page *) * nr;
  37
  38         if (!pages)
  39                 return;
  40
  41         if (likely(size <= sbi->page_array_slab_size))
  42                 kmem_cache_free(sbi->page_array_slab, pages);
  43         else
  44                 kfree(pages);
  45 }
  46
  47 struct f2fs_compress_ops {
  48         int (*init_compress_ctx)(struct compress_ctx *cc);
  49         void (*destroy_compress_ctx)(struct compress_ctx *cc);
  50         int (*compress_pages)(struct compress_ctx *cc);
  51         int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
  52         void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
  53         int (*decompress_pages)(struct decompress_io_ctx *dic);
  54 };
  55
  56 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
  57 {
  58         return index & (cc->cluster_size - 1);
  59 }
  60
  61 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
  62 {
  63         return index >> cc->log_cluster_size;
  64 }
  65
  66 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
  67 {
  68         return cc->cluster_idx << cc->log_cluster_size;
  69 }
  70
  71 bool f2fs_is_compressed_page(struct page *page)
  72 {
  73         if (!PagePrivate(page))
  74                 return false;
  75         if (!page_private(page))
  76                 return false;
  77         if (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
  78                 return false;
  79         /*
  80          * page->private may be set with pid.
  81          * pid_max is enough to check if it is traced.
  82          */
  83         if (IS_IO_TRACED_PAGE(page))
  84                 return false;
  85
  86         f2fs_bug_on(F2FS_M_SB(page->mapping),
  87                 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
  88         return true;
  89 }
  90
  91 static void f2fs_set_compressed_page(struct page *page,
  92                 struct inode *inode, pgoff_t index, void *data)
  93 {
  94         SetPagePrivate(page);
  95         set_page_private(page, (unsigned long)data);
  96
  97         /* i_crypto_info and iv index */
  98         page->index = index;
  99         page->mapping = inode->i_mapping;
 100 }
 101
 102 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
 103 {
 104         int i;
 105
 106         for (i = 0; i < len; i++) {
 107                 if (!cc->rpages[i])
 108                         continue;
 109                 if (unlock)
 110                         unlock_page(cc->rpages[i]);
 111                 else
 112                         put_page(cc->rpages[i]);
 113         }
 114 }
 115
 116 static void f2fs_put_rpages(struct compress_ctx *cc)
 117 {
 118         f2fs_drop_rpages(cc, cc->cluster_size, false);
 119 }
 120
 121 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
 122 {
 123         f2fs_drop_rpages(cc, len, true);
 124 }
 125
 126 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 127                 struct writeback_control *wbc, bool redirty, int unlock)
 128 {
 129         unsigned int i;
 130
 131         for (i = 0; i < cc->cluster_size; i++) {
 132                 if (!cc->rpages[i])
 133                         continue;
 134                 if (redirty)
 135                         redirty_page_for_writepage(wbc, cc->rpages[i]);
 136                 f2fs_put_page(cc->rpages[i], unlock);
 137         }
 138 }
 139
 140 struct page *f2fs_compress_control_page(struct page *page)
 141 {
 142         return ((struct compress_io_ctx *)page_private(page))->rpages[0];
 143 }
 144
 145 int f2fs_init_compress_ctx(struct compress_ctx *cc)
 146 {
 147         if (cc->rpages)
 148                 return 0;
 149
 150         cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 151         return cc->rpages ? 0 : -ENOMEM;
 152 }
 153
 154 void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
 155 {
 156         page_array_free(cc->inode, cc->rpages, cc->cluster_size);
 157         cc->rpages = NULL;
 158         cc->nr_rpages = 0;
 159         cc->nr_cpages = 0;
 160         if (!reuse)
 161                 cc->cluster_idx = NULL_CLUSTER;
 162 }
 163
 164 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 165 {
 166         unsigned int cluster_ofs;
 167
 168         if (!f2fs_cluster_can_merge_page(cc, page->index))
 169                 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 170
 171         cluster_ofs = offset_in_cluster(cc, page->index);
 172         cc->rpages[cluster_ofs] = page;
 173         cc->nr_rpages++;
 174         cc->cluster_idx = cluster_idx(cc, page->index);
 175 }
 176
 177 #ifdef CONFIG_F2FS_FS_LZO
 178 static int lzo_init_compress_ctx(struct compress_ctx *cc)
 179 {
 180         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 181                                 LZO1X_MEM_COMPRESS, GFP_NOFS);
 182         if (!cc->private)
 183                 return -ENOMEM;
 184
 185         cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 186         return 0;
 187 }
 188
 189 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 190 {
 191         kvfree(cc->private);
 192         cc->private = NULL;
 193 }
 194
 195 static int lzo_compress_pages(struct compress_ctx *cc)
 196 {
 197         int ret;
 198
 199         ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 200                                         &cc->clen, cc->private);
 201         if (ret != LZO_E_OK) {
 202                 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
 203                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 204                 return -EIO;
 205         }
 206         return 0;
 207 }
 208
 209 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 210 {
 211         int ret;
 212
 213         ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 214                                                 dic->rbuf, &dic->rlen);
 215         if (ret != LZO_E_OK) {
 216                 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
 217                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 218                 return -EIO;
 219         }
 220
 221         if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 222                 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
 223                                         "expected:%lu\n", KERN_ERR,
 224                                         F2FS_I_SB(dic->inode)->sb->s_id,
 225                                         dic->rlen,
 226                                         PAGE_SIZE << dic->log_cluster_size);
 227                 return -EIO;
 228         }
 229         return 0;
 230 }
 231
 232 static const struct f2fs_compress_ops f2fs_lzo_ops = {
 233         .init_compress_ctx      = lzo_init_compress_ctx,
 234         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 235         .compress_pages         = lzo_compress_pages,
 236         .decompress_pages       = lzo_decompress_pages,
 237 };
 238 #endif
 239
 240 #ifdef CONFIG_F2FS_FS_LZ4
 241 static int lz4_init_compress_ctx(struct compress_ctx *cc)
 242 {
 243         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 244                                 LZ4_MEM_COMPRESS, GFP_NOFS);
 245         if (!cc->private)
 246                 return -ENOMEM;
 247
 248         /*
 249          * we do not change cc->clen to LZ4_compressBound(inputsize) to
 250          * adapt worst compress case, because lz4 compressor can handle
 251          * output budget properly.
 252          */
 253         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 254         return 0;
 255 }
 256
 257 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 258 {
 259         kvfree(cc->private);
 260         cc->private = NULL;
 261 }
 262
 263 static int lz4_compress_pages(struct compress_ctx *cc)
 264 {
 265         int len;
 266
 267         len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 268                                                 cc->clen, cc->private);
 269         if (!len)
 270                 return -EAGAIN;
 271
 272         cc->clen = len;
 273         return 0;
 274 }
 275
 276 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 277 {
 278         int ret;
 279
 280         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 281                                                 dic->clen, dic->rlen);
 282         if (ret < 0) {
 283                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 284                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 285                 return -EIO;
 286         }
 287
 288         if (ret != PAGE_SIZE << dic->log_cluster_size) {
 289                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
 290                                         "expected:%lu\n", KERN_ERR,
 291                                         F2FS_I_SB(dic->inode)->sb->s_id, ret,
 292                                         PAGE_SIZE << dic->log_cluster_size);
 293                 return -EIO;
 294         }
 295         return 0;
 296 }
 297
 298 static const struct f2fs_compress_ops f2fs_lz4_ops = {
 299         .init_compress_ctx      = lz4_init_compress_ctx,
 300         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 301         .compress_pages         = lz4_compress_pages,
 302         .decompress_pages       = lz4_decompress_pages,
 303 };
 304 #endif
 305
 306 #ifdef CONFIG_F2FS_FS_ZSTD
 307 #define F2FS_ZSTD_DEFAULT_CLEVEL        1
 308
 309 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 310 {
 311         ZSTD_parameters params;
 312         ZSTD_CStream *stream;
 313         void *workspace;
 314         unsigned int workspace_size;
 315
 316         params = ZSTD_getParams(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen, 0);
 317         workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
 318
 319         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 320                                         workspace_size, GFP_NOFS);
 321         if (!workspace)
 322                 return -ENOMEM;
 323
 324         stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
 325         if (!stream) {
 326                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
 327                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 328                                 __func__);
 329                 kvfree(workspace);
 330                 return -EIO;
 331         }
 332
 333         cc->private = workspace;
 334         cc->private2 = stream;
 335
 336         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 337         return 0;
 338 }
 339
 340 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 341 {
 342         kvfree(cc->private);
 343         cc->private = NULL;
 344         cc->private2 = NULL;
 345 }
 346
 347 static int zstd_compress_pages(struct compress_ctx *cc)
 348 {
 349         ZSTD_CStream *stream = cc->private2;
 350         ZSTD_inBuffer inbuf;
 351         ZSTD_outBuffer outbuf;
 352         int src_size = cc->rlen;
 353         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 354         int ret;
 355
 356         inbuf.pos = 0;
 357         inbuf.src = cc->rbuf;
 358         inbuf.size = src_size;
 359
 360         outbuf.pos = 0;
 361         outbuf.dst = cc->cbuf->cdata;
 362         outbuf.size = dst_size;
 363
 364         ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
 365         if (ZSTD_isError(ret)) {
 366                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 367                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 368                                 __func__, ZSTD_getErrorCode(ret));
 369                 return -EIO;
 370         }
 371
 372         ret = ZSTD_endStream(stream, &outbuf);
 373         if (ZSTD_isError(ret)) {
 374                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
 375                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 376                                 __func__, ZSTD_getErrorCode(ret));
 377                 return -EIO;
 378         }
 379
 380         /*
 381          * there is compressed data remained in intermediate buffer due to
 382          * no more space in cbuf.cdata
 383          */
 384         if (ret)
 385                 return -EAGAIN;
 386
 387         cc->clen = outbuf.pos;
 388         return 0;
 389 }
 390
 391 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 392 {
 393         ZSTD_DStream *stream;
 394         void *workspace;
 395         unsigned int workspace_size;
 396         unsigned int max_window_size =
 397                         MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 398
 399         workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
 400
 401         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 402                                         workspace_size, GFP_NOFS);
 403         if (!workspace)
 404                 return -ENOMEM;
 405
 406         stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
 407         if (!stream) {
 408                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
 409                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 410                                 __func__);
 411                 kvfree(workspace);
 412                 return -EIO;
 413         }
 414
 415         dic->private = workspace;
 416         dic->private2 = stream;
 417
 418         return 0;
 419 }
 420
 421 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 422 {
 423         kvfree(dic->private);
 424         dic->private = NULL;
 425         dic->private2 = NULL;
 426 }
 427
 428 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 429 {
 430         ZSTD_DStream *stream = dic->private2;
 431         ZSTD_inBuffer inbuf;
 432         ZSTD_outBuffer outbuf;
 433         int ret;
 434
 435         inbuf.pos = 0;
 436         inbuf.src = dic->cbuf->cdata;
 437         inbuf.size = dic->clen;
 438
 439         outbuf.pos = 0;
 440         outbuf.dst = dic->rbuf;
 441         outbuf.size = dic->rlen;
 442
 443         ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
 444         if (ZSTD_isError(ret)) {
 445                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 446                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 447                                 __func__, ZSTD_getErrorCode(ret));
 448                 return -EIO;
 449         }
 450
 451         if (dic->rlen != outbuf.pos) {
 452                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 453                                 "expected:%lu\n", KERN_ERR,
 454                                 F2FS_I_SB(dic->inode)->sb->s_id,
 455                                 __func__, dic->rlen,
 456                                 PAGE_SIZE << dic->log_cluster_size);
 457                 return -EIO;
 458         }
 459
 460         return 0;
 461 }
 462
 463 static const struct f2fs_compress_ops f2fs_zstd_ops = {
 464         .init_compress_ctx      = zstd_init_compress_ctx,
 465         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 466         .compress_pages         = zstd_compress_pages,
 467         .init_decompress_ctx    = zstd_init_decompress_ctx,
 468         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 469         .decompress_pages       = zstd_decompress_pages,
 470 };
 471 #endif
 472
 473 #ifdef CONFIG_F2FS_FS_LZO
 474 #ifdef CONFIG_F2FS_FS_LZORLE
 475 static int lzorle_compress_pages(struct compress_ctx *cc)
 476 {
 477         int ret;
 478
 479         ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 480                                         &cc->clen, cc->private);
 481         if (ret != LZO_E_OK) {
 482                 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
 483                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 484                 return -EIO;
 485         }
 486         return 0;
 487 }
 488
 489 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 490         .init_compress_ctx      = lzo_init_compress_ctx,
 491         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 492         .compress_pages         = lzorle_compress_pages,
 493         .decompress_pages       = lzo_decompress_pages,
 494 };
 495 #endif
 496 #endif
 497
 498 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 499 #ifdef CONFIG_F2FS_FS_LZO
 500         &f2fs_lzo_ops,
 501 #else
 502         NULL,
 503 #endif
 504 #ifdef CONFIG_F2FS_FS_LZ4
 505         &f2fs_lz4_ops,
 506 #else
 507         NULL,
 508 #endif
 509 #ifdef CONFIG_F2FS_FS_ZSTD
 510         &f2fs_zstd_ops,
 511 #else
 512         NULL,
 513 #endif
 514 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 515         &f2fs_lzorle_ops,
 516 #else
 517         NULL,
 518 #endif
 519 };
 520
 521 bool f2fs_is_compress_backend_ready(struct inode *inode)
 522 {
 523         if (!f2fs_compressed_file(inode))
 524                 return true;
 525         return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 526 }
 527
 528 static mempool_t *compress_page_pool;
 529 static int num_compress_pages = 512;
 530 module_param(num_compress_pages, uint, 0444);
 531 MODULE_PARM_DESC(num_compress_pages,
 532                 "Number of intermediate compress pages to preallocate");
 533
 534 int f2fs_init_compress_mempool(void)
 535 {
 536         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 537         if (!compress_page_pool)
 538                 return -ENOMEM;
 539
 540         return 0;
 541 }
 542
 543 void f2fs_destroy_compress_mempool(void)
 544 {
 545         mempool_destroy(compress_page_pool);
 546 }
 547
 548 static struct page *f2fs_compress_alloc_page(void)
 549 {
 550         struct page *page;
 551
 552         page = mempool_alloc(compress_page_pool, GFP_NOFS);
 553         lock_page(page);
 554
 555         return page;
 556 }
 557
 558 static void f2fs_compress_free_page(struct page *page)
 559 {
 560         if (!page)
 561                 return;
 562         set_page_private(page, (unsigned long)NULL);
 563         ClearPagePrivate(page);
 564         page->mapping = NULL;
 565         unlock_page(page);
 566         mempool_free(page, compress_page_pool);
 567 }
 568
 569 #define MAX_VMAP_RETRIES        3
 570
 571 static void *f2fs_vmap(struct page **pages, unsigned int count)
 572 {
 573         int i;
 574         void *buf = NULL;
 575
 576         for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 577                 buf = vm_map_ram(pages, count, -1);
 578                 if (buf)
 579                         break;
 580                 vm_unmap_aliases();
 581         }
 582         return buf;
 583 }
 584
 585 static int f2fs_compress_pages(struct compress_ctx *cc)
 586 {
 587         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 588         const struct f2fs_compress_ops *cops =
 589                                 f2fs_cops[fi->i_compress_algorithm];
 590         unsigned int max_len, new_nr_cpages;
 591         struct page **new_cpages;
 592         int i, ret;
 593
 594         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 595                                 cc->cluster_size, fi->i_compress_algorithm);
 596
 597         if (cops->init_compress_ctx) {
 598                 ret = cops->init_compress_ctx(cc);
 599                 if (ret)
 600                         goto out;
 601         }
 602
 603         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 604         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 605
 606         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 607         if (!cc->cpages) {
 608                 ret = -ENOMEM;
 609                 goto destroy_compress_ctx;
 610         }
 611
 612         for (i = 0; i < cc->nr_cpages; i++) {
 613                 cc->cpages[i] = f2fs_compress_alloc_page();
 614                 if (!cc->cpages[i]) {
 615                         ret = -ENOMEM;
 616                         goto out_free_cpages;
 617                 }
 618         }
 619
 620         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 621         if (!cc->rbuf) {
 622                 ret = -ENOMEM;
 623                 goto out_free_cpages;
 624         }
 625
 626         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 627         if (!cc->cbuf) {
 628                 ret = -ENOMEM;
 629                 goto out_vunmap_rbuf;
 630         }
 631
 632         ret = cops->compress_pages(cc);
 633         if (ret)
 634                 goto out_vunmap_cbuf;
 635
 636         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 637
 638         if (cc->clen > max_len) {
 639                 ret = -EAGAIN;
 640                 goto out_vunmap_cbuf;
 641         }
 642
 643         cc->cbuf->clen = cpu_to_le32(cc->clen);
 644
 645         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 646                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 647
 648         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 649
 650         /* Now we're going to cut unnecessary tail pages */
 651         new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
 652         if (!new_cpages) {
 653                 ret = -ENOMEM;
 654                 goto out_vunmap_cbuf;
 655         }
 656
 657         /* zero out any unused part of the last page */
 658         memset(&cc->cbuf->cdata[cc->clen], 0,
 659                         (new_nr_cpages * PAGE_SIZE) -
 660                         (cc->clen + COMPRESS_HEADER_SIZE));
 661
 662         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 663         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 664
 665         for (i = 0; i < cc->nr_cpages; i++) {
 666                 if (i < new_nr_cpages) {
 667                         new_cpages[i] = cc->cpages[i];
 668                         continue;
 669                 }
 670                 f2fs_compress_free_page(cc->cpages[i]);
 671                 cc->cpages[i] = NULL;
 672         }
 673
 674         if (cops->destroy_compress_ctx)
 675                 cops->destroy_compress_ctx(cc);
 676
 677         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 678         cc->cpages = new_cpages;
 679         cc->nr_cpages = new_nr_cpages;
 680
 681         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 682                                                         cc->clen, ret);
 683         return 0;
 684
 685 out_vunmap_cbuf:
 686         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 687 out_vunmap_rbuf:
 688         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 689 out_free_cpages:
 690         for (i = 0; i < cc->nr_cpages; i++) {
 691                 if (cc->cpages[i])
 692                         f2fs_compress_free_page(cc->cpages[i]);
 693         }
 694         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 695         cc->cpages = NULL;
 696 destroy_compress_ctx:
 697         if (cops->destroy_compress_ctx)
 698                 cops->destroy_compress_ctx(cc);
 699 out:
 700         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 701                                                         cc->clen, ret);
 702         return ret;
 703 }
 704
 705 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 706 {
 707         struct decompress_io_ctx *dic =
 708                         (struct decompress_io_ctx *)page_private(page);
 709         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 710         struct f2fs_inode_info *fi= F2FS_I(dic->inode);
 711         const struct f2fs_compress_ops *cops =
 712                         f2fs_cops[fi->i_compress_algorithm];
 713         int ret;
 714         int i;
 715
 716         dec_page_count(sbi, F2FS_RD_DATA);
 717
 718         if (bio->bi_status || PageError(page))
 719                 dic->failed = true;
 720
 721         if (atomic_dec_return(&dic->pending_pages))
 722                 return;
 723
 724         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 725                                 dic->cluster_size, fi->i_compress_algorithm);
 726
 727         /* submit partial compressed pages */
 728         if (dic->failed) {
 729                 ret = -EIO;
 730                 goto out_free_dic;
 731         }
 732
 733         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
 734         if (!dic->tpages) {
 735                 ret = -ENOMEM;
 736                 goto out_free_dic;
 737         }
 738
 739         for (i = 0; i < dic->cluster_size; i++) {
 740                 if (dic->rpages[i]) {
 741                         dic->tpages[i] = dic->rpages[i];
 742                         continue;
 743                 }
 744
 745                 dic->tpages[i] = f2fs_compress_alloc_page();
 746                 if (!dic->tpages[i]) {
 747                         ret = -ENOMEM;
 748                         goto out_free_dic;
 749                 }
 750         }
 751
 752         if (cops->init_decompress_ctx) {
 753                 ret = cops->init_decompress_ctx(dic);
 754                 if (ret)
 755                         goto out_free_dic;
 756         }
 757
 758         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
 759         if (!dic->rbuf) {
 760                 ret = -ENOMEM;
 761                 goto destroy_decompress_ctx;
 762         }
 763
 764         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
 765         if (!dic->cbuf) {
 766                 ret = -ENOMEM;
 767                 goto out_vunmap_rbuf;
 768         }
 769
 770         dic->clen = le32_to_cpu(dic->cbuf->clen);
 771         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 772
 773         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 774                 ret = -EFSCORRUPTED;
 775                 goto out_vunmap_cbuf;
 776         }
 777
 778         ret = cops->decompress_pages(dic);
 779
 780 out_vunmap_cbuf:
 781         vm_unmap_ram(dic->cbuf, dic->nr_cpages);
 782 out_vunmap_rbuf:
 783         vm_unmap_ram(dic->rbuf, dic->cluster_size);
 784 destroy_decompress_ctx:
 785         if (cops->destroy_decompress_ctx)
 786                 cops->destroy_decompress_ctx(dic);
 787 out_free_dic:
 788         if (!verity)
 789                 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
 790                                                                 ret, false);
 791
 792         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 793                                                         dic->clen, ret);
 794         if (!verity)
 795                 f2fs_free_dic(dic);
 796 }
 797
 798 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 799 {
 800         if (cc->cluster_idx == NULL_CLUSTER)
 801                 return true;
 802         return cc->cluster_idx == cluster_idx(cc, index);
 803 }
 804
 805 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 806 {
 807         return cc->nr_rpages == 0;
 808 }
 809
 810 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 811 {
 812         return cc->cluster_size == cc->nr_rpages;
 813 }
 814
 815 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 816 {
 817         if (f2fs_cluster_is_empty(cc))
 818                 return true;
 819         return is_page_in_cluster(cc, index);
 820 }
 821
 822 static bool __cluster_may_compress(struct compress_ctx *cc)
 823 {
 824         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 825         loff_t i_size = i_size_read(cc->inode);
 826         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 827         int i;
 828
 829         for (i = 0; i < cc->cluster_size; i++) {
 830                 struct page *page = cc->rpages[i];
 831
 832                 f2fs_bug_on(sbi, !page);
 833
 834                 if (unlikely(f2fs_cp_error(sbi)))
 835                         return false;
 836                 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 837                         return false;
 838
 839                 /* beyond EOF */
 840                 if (page->index >= nr_pages)
 841                         return false;
 842         }
 843         return true;
 844 }
 845
 846 static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
 847 {
 848         struct dnode_of_data dn;
 849         int ret;
 850
 851         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
 852         ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
 853                                                         LOOKUP_NODE);
 854         if (ret) {
 855                 if (ret == -ENOENT)
 856                         ret = 0;
 857                 goto fail;
 858         }
 859
 860         if (dn.data_blkaddr == COMPRESS_ADDR) {
 861                 int i;
 862
 863                 ret = 1;
 864                 for (i = 1; i < cc->cluster_size; i++) {
 865                         block_t blkaddr;
 866
 867                         blkaddr = data_blkaddr(dn.inode,
 868                                         dn.node_page, dn.ofs_in_node + i);
 869                         if (compr) {
 870                                 if (__is_valid_data_blkaddr(blkaddr))
 871                                         ret++;
 872                         } else {
 873                                 if (blkaddr != NULL_ADDR)
 874                                         ret++;
 875                         }
 876                 }
 877         }
 878 fail:
 879         f2fs_put_dnode(&dn);
 880         return ret;
 881 }
 882
 883 /* return # of compressed blocks in compressed cluster */
 884 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 885 {
 886         return __f2fs_cluster_blocks(cc, true);
 887 }
 888
 889 /* return # of valid blocks in compressed cluster */
 890 static int f2fs_cluster_blocks(struct compress_ctx *cc)
 891 {
 892         return __f2fs_cluster_blocks(cc, false);
 893 }
 894
 895 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 896 {
 897         struct compress_ctx cc = {
 898                 .inode = inode,
 899                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
 900                 .cluster_size = F2FS_I(inode)->i_cluster_size,
 901                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
 902         };
 903
 904         return f2fs_cluster_blocks(&cc);
 905 }
 906
 907 static bool cluster_may_compress(struct compress_ctx *cc)
 908 {
 909         if (!f2fs_compressed_file(cc->inode))
 910                 return false;
 911         if (f2fs_is_atomic_file(cc->inode))
 912                 return false;
 913         if (f2fs_is_mmap_file(cc->inode))
 914                 return false;
 915         if (!f2fs_cluster_is_full(cc))
 916                 return false;
 917         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
 918                 return false;
 919         return __cluster_may_compress(cc);
 920 }
 921
 922 static void set_cluster_writeback(struct compress_ctx *cc)
 923 {
 924         int i;
 925
 926         for (i = 0; i < cc->cluster_size; i++) {
 927                 if (cc->rpages[i])
 928                         set_page_writeback(cc->rpages[i]);
 929         }
 930 }
 931
 932 static void set_cluster_dirty(struct compress_ctx *cc)
 933 {
 934         int i;
 935
 936         for (i = 0; i < cc->cluster_size; i++)
 937                 if (cc->rpages[i])
 938                         set_page_dirty(cc->rpages[i]);
 939 }
 940
 941 static int prepare_compress_overwrite(struct compress_ctx *cc,
 942                 struct page **pagep, pgoff_t index, void **fsdata)
 943 {
 944         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 945         struct address_space *mapping = cc->inode->i_mapping;
 946         struct page *page;
 947         struct dnode_of_data dn;
 948         sector_t last_block_in_bio;
 949         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
 950         pgoff_t start_idx = start_idx_of_cluster(cc);
 951         int i, ret;
 952         bool prealloc;
 953
 954 retry:
 955         ret = f2fs_cluster_blocks(cc);
 956         if (ret <= 0)
 957                 return ret;
 958
 959         /* compressed case */
 960         prealloc = (ret < cc->cluster_size);
 961
 962         ret = f2fs_init_compress_ctx(cc);
 963         if (ret)
 964                 return ret;
 965
 966         /* keep page reference to avoid page reclaim */
 967         for (i = 0; i < cc->cluster_size; i++) {
 968                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
 969                                                         fgp_flag, GFP_NOFS);
 970                 if (!page) {
 971                         ret = -ENOMEM;
 972                         goto unlock_pages;
 973                 }
 974
 975                 if (PageUptodate(page))
 976                         f2fs_put_page(page, 1);
 977                 else
 978                         f2fs_compress_ctx_add_page(cc, page);
 979         }
 980
 981         if (!f2fs_cluster_is_empty(cc)) {
 982                 struct bio *bio = NULL;
 983
 984                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
 985                                         &last_block_in_bio, false, true);
 986                 f2fs_put_rpages(cc);
 987                 f2fs_destroy_compress_ctx(cc, true);
 988                 if (ret)
 989                         goto out;
 990                 if (bio)
 991                         f2fs_submit_bio(sbi, bio, DATA);
 992
 993                 ret = f2fs_init_compress_ctx(cc);
 994                 if (ret)
 995                         goto out;
 996         }
 997
 998         for (i = 0; i < cc->cluster_size; i++) {
 999                 f2fs_bug_on(sbi, cc->rpages[i]);
1000
1001                 page = find_lock_page(mapping, start_idx + i);
1002                 if (!page) {
1003                         /* page can be truncated */
1004                         goto release_and_retry;
1005                 }
1006
1007                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1008                 f2fs_compress_ctx_add_page(cc, page);
1009
1010                 if (!PageUptodate(page)) {
1011 release_and_retry:
1012                         f2fs_put_rpages(cc);
1013                         f2fs_unlock_rpages(cc, i + 1);
1014                         f2fs_destroy_compress_ctx(cc, true);
1015                         goto retry;
1016                 }
1017         }
1018
1019         if (prealloc) {
1020                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
1021
1022                 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1023
1024                 for (i = cc->cluster_size - 1; i > 0; i--) {
1025                         ret = f2fs_get_block(&dn, start_idx + i);
1026                         if (ret) {
1027                                 i = cc->cluster_size;
1028                                 break;
1029                         }
1030
1031                         if (dn.data_blkaddr != NEW_ADDR)
1032                                 break;
1033                 }
1034
1035                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
1036         }
1037
1038         if (likely(!ret)) {
1039                 *fsdata = cc->rpages;
1040                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1041                 return cc->cluster_size;
1042         }
1043
1044 unlock_pages:
1045         f2fs_put_rpages(cc);
1046         f2fs_unlock_rpages(cc, i);
1047         f2fs_destroy_compress_ctx(cc, true);
1048 out:
1049         return ret;
1050 }
1051
1052 int f2fs_prepare_compress_overwrite(struct inode *inode,
1053                 struct page **pagep, pgoff_t index, void **fsdata)
1054 {
1055         struct compress_ctx cc = {
1056                 .inode = inode,
1057                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1058                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1059                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1060                 .rpages = NULL,
1061                 .nr_rpages = 0,
1062         };
1063
1064         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1065 }
1066
1067 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1068                                         pgoff_t index, unsigned copied)
1069
1070 {
1071         struct compress_ctx cc = {
1072                 .inode = inode,
1073                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1074                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1075                 .rpages = fsdata,
1076         };
1077         bool first_index = (index == cc.rpages[0]->index);
1078
1079         if (copied)
1080                 set_cluster_dirty(&cc);
1081
1082         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1083         f2fs_destroy_compress_ctx(&cc, false);
1084
1085         return first_index;
1086 }
1087
1088 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1089 {
1090         void *fsdata = NULL;
1091         struct page *pagep;
1092         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1093         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1094                                                         log_cluster_size;
1095         int err;
1096
1097         err = f2fs_is_compressed_cluster(inode, start_idx);
1098         if (err < 0)
1099                 return err;
1100
1101         /* truncate normal cluster */
1102         if (!err)
1103                 return f2fs_do_truncate_blocks(inode, from, lock);
1104
1105         /* truncate compressed cluster */
1106         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1107                                                 start_idx, &fsdata);
1108
1109         /* should not be a normal cluster */
1110         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1111
1112         if (err <= 0)
1113                 return err;
1114
1115         if (err > 0) {
1116                 struct page **rpages = fsdata;
1117                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1118                 int i;
1119
1120                 for (i = cluster_size - 1; i >= 0; i--) {
1121                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1122
1123                         if (from <= start) {
1124                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1125                         } else {
1126                                 zero_user_segment(rpages[i], from - start,
1127                                                                 PAGE_SIZE);
1128                                 break;
1129                         }
1130                 }
1131
1132                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1133         }
1134         return 0;
1135 }
1136
1137 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1138                                         int *submitted,
1139                                         struct writeback_control *wbc,
1140                                         enum iostat_type io_type)
1141 {
1142         struct inode *inode = cc->inode;
1143         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1144         struct f2fs_inode_info *fi = F2FS_I(inode);
1145         struct f2fs_io_info fio = {
1146                 .sbi = sbi,
1147                 .ino = cc->inode->i_ino,
1148                 .type = DATA,
1149                 .op = REQ_OP_WRITE,
1150                 .op_flags = wbc_to_write_flags(wbc),
1151                 .old_blkaddr = NEW_ADDR,
1152                 .page = NULL,
1153                 .encrypted_page = NULL,
1154                 .compressed_page = NULL,
1155                 .submitted = false,
1156                 .io_type = io_type,
1157                 .io_wbc = wbc,
1158                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1159         };
1160         struct dnode_of_data dn;
1161         struct node_info ni;
1162         struct compress_io_ctx *cic;
1163         pgoff_t start_idx = start_idx_of_cluster(cc);
1164         unsigned int last_index = cc->cluster_size - 1;
1165         loff_t psize;
1166         int i, err;
1167
1168         if (IS_NOQUOTA(inode)) {
1169                 /*
1170                  * We need to wait for node_write to avoid block allocation during
1171                  * checkpoint. This can only happen to quota writes which can cause
1172                  * the below discard race condition.
1173                  */
1174                 down_read(&sbi->node_write);
1175         } else if (!f2fs_trylock_op(sbi)) {
1176                 goto out_free;
1177         }
1178
1179         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1180
1181         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1182         if (err)
1183                 goto out_unlock_op;
1184
1185         for (i = 0; i < cc->cluster_size; i++) {
1186                 if (data_blkaddr(dn.inode, dn.node_page,
1187                                         dn.ofs_in_node + i) == NULL_ADDR)
1188                         goto out_put_dnode;
1189         }
1190
1191         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1192
1193         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1194         if (err)
1195                 goto out_put_dnode;
1196
1197         fio.version = ni.version;
1198
1199         cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1200         if (!cic)
1201                 goto out_put_dnode;
1202
1203         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1204         cic->inode = inode;
1205         atomic_set(&cic->pending_pages, cc->nr_cpages);
1206         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1207         if (!cic->rpages)
1208                 goto out_put_cic;
1209
1210         cic->nr_rpages = cc->cluster_size;
1211
1212         for (i = 0; i < cc->nr_cpages; i++) {
1213                 f2fs_set_compressed_page(cc->cpages[i], inode,
1214                                         cc->rpages[i + 1]->index, cic);
1215                 fio.compressed_page = cc->cpages[i];
1216
1217                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1218                                                 dn.ofs_in_node + i + 1);
1219
1220                 /* wait for GCed page writeback via META_MAPPING */
1221                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1222
1223                 if (fio.encrypted) {
1224                         fio.page = cc->rpages[i + 1];
1225                         err = f2fs_encrypt_one_page(&fio);
1226                         if (err)
1227                                 goto out_destroy_crypt;
1228                         cc->cpages[i] = fio.encrypted_page;
1229                 }
1230         }
1231
1232         set_cluster_writeback(cc);
1233
1234         for (i = 0; i < cc->cluster_size; i++)
1235                 cic->rpages[i] = cc->rpages[i];
1236
1237         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1238                 block_t blkaddr;
1239
1240                 blkaddr = f2fs_data_blkaddr(&dn);
1241                 fio.page = cc->rpages[i];
1242                 fio.old_blkaddr = blkaddr;
1243
1244                 /* cluster header */
1245                 if (i == 0) {
1246                         if (blkaddr == COMPRESS_ADDR)
1247                                 fio.compr_blocks++;
1248                         if (__is_valid_data_blkaddr(blkaddr))
1249                                 f2fs_invalidate_blocks(sbi, blkaddr);
1250                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1251                         goto unlock_continue;
1252                 }
1253
1254                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1255                         fio.compr_blocks++;
1256
1257                 if (i > cc->nr_cpages) {
1258                         if (__is_valid_data_blkaddr(blkaddr)) {
1259                                 f2fs_invalidate_blocks(sbi, blkaddr);
1260                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1261                         }
1262                         goto unlock_continue;
1263                 }
1264
1265                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1266
1267                 if (fio.encrypted)
1268                         fio.encrypted_page = cc->cpages[i - 1];
1269                 else
1270                         fio.compressed_page = cc->cpages[i - 1];
1271
1272                 cc->cpages[i - 1] = NULL;
1273                 f2fs_outplace_write_data(&dn, &fio);
1274                 (*submitted)++;
1275 unlock_continue:
1276                 inode_dec_dirty_pages(cc->inode);
1277                 unlock_page(fio.page);
1278         }
1279
1280         if (fio.compr_blocks)
1281                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1282         f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1283
1284         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1285         if (cc->cluster_idx == 0)
1286                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1287
1288         f2fs_put_dnode(&dn);
1289         if (IS_NOQUOTA(inode))
1290                 up_read(&sbi->node_write);
1291         else
1292                 f2fs_unlock_op(sbi);
1293
1294         spin_lock(&fi->i_size_lock);
1295         if (fi->last_disk_size < psize)
1296                 fi->last_disk_size = psize;
1297         spin_unlock(&fi->i_size_lock);
1298
1299         f2fs_put_rpages(cc);
1300         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1301         cc->cpages = NULL;
1302         f2fs_destroy_compress_ctx(cc, false);
1303         return 0;
1304
1305 out_destroy_crypt:
1306         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1307
1308         for (--i; i >= 0; i--)
1309                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1310 out_put_cic:
1311         kmem_cache_free(cic_entry_slab, cic);
1312 out_put_dnode:
1313         f2fs_put_dnode(&dn);
1314 out_unlock_op:
1315         if (IS_NOQUOTA(inode))
1316                 up_read(&sbi->node_write);
1317         else
1318                 f2fs_unlock_op(sbi);
1319 out_free:
1320         for (i = 0; i < cc->nr_cpages; i++) {
1321                 if (!cc->cpages[i])
1322                         continue;
1323                 f2fs_compress_free_page(cc->cpages[i]);
1324                 cc->cpages[i] = NULL;
1325         }
1326         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1327         cc->cpages = NULL;
1328         return -EAGAIN;
1329 }
1330
1331 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1332 {
1333         struct f2fs_sb_info *sbi = bio->bi_private;
1334         struct compress_io_ctx *cic =
1335                         (struct compress_io_ctx *)page_private(page);
1336         int i;
1337
1338         if (unlikely(bio->bi_status))
1339                 mapping_set_error(cic->inode->i_mapping, -EIO);
1340
1341         f2fs_compress_free_page(page);
1342
1343         dec_page_count(sbi, F2FS_WB_DATA);
1344
1345         if (atomic_dec_return(&cic->pending_pages))
1346                 return;
1347
1348         for (i = 0; i < cic->nr_rpages; i++) {
1349                 WARN_ON(!cic->rpages[i]);
1350                 clear_cold_data(cic->rpages[i]);
1351                 end_page_writeback(cic->rpages[i]);
1352         }
1353
1354         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1355         kmem_cache_free(cic_entry_slab, cic);
1356 }
1357
1358 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1359                                         int *submitted,
1360                                         struct writeback_control *wbc,
1361                                         enum iostat_type io_type)
1362 {
1363         struct address_space *mapping = cc->inode->i_mapping;
1364         int _submitted, compr_blocks, ret, i;
1365
1366         compr_blocks = f2fs_compressed_blocks(cc);
1367
1368         for (i = 0; i < cc->cluster_size; i++) {
1369                 if (!cc->rpages[i])
1370                         continue;
1371
1372                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1373                 unlock_page(cc->rpages[i]);
1374         }
1375
1376         if (compr_blocks < 0)
1377                 return compr_blocks;
1378
1379         for (i = 0; i < cc->cluster_size; i++) {
1380                 if (!cc->rpages[i])
1381                         continue;
1382 retry_write:
1383                 lock_page(cc->rpages[i]);
1384
1385                 if (cc->rpages[i]->mapping != mapping) {
1386 continue_unlock:
1387                         unlock_page(cc->rpages[i]);
1388                         continue;
1389                 }
1390
1391                 if (!PageDirty(cc->rpages[i]))
1392                         goto continue_unlock;
1393
1394                 if (PageWriteback(cc->rpages[i])) {
1395                         if (wbc->sync_mode == WB_SYNC_NONE)
1396                                 goto continue_unlock;
1397                         f2fs_wait_on_page_writeback(cc->rpages[i], DATA, true, true);
1398                 }
1399
1400                 if (!clear_page_dirty_for_io(cc->rpages[i]))
1401                         goto continue_unlock;
1402
1403                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1404                                                 NULL, NULL, wbc, io_type,
1405                                                 compr_blocks, false);
1406                 if (ret) {
1407                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1408                                 unlock_page(cc->rpages[i]);
1409                                 ret = 0;
1410                         } else if (ret == -EAGAIN) {
1411                                 /*
1412                                  * for quota file, just redirty left pages to
1413                                  * avoid deadlock caused by cluster update race
1414                                  * from foreground operation.
1415                                  */
1416                                 if (IS_NOQUOTA(cc->inode))
1417                                         return 0;
1418                                 ret = 0;
1419                                 cond_resched();
1420                                 congestion_wait(BLK_RW_ASYNC,
1421                                                 DEFAULT_IO_TIMEOUT);
1422                                 goto retry_write;
1423                         }
1424                         return ret;
1425                 }
1426
1427                 *submitted += _submitted;
1428         }
1429
1430         f2fs_balance_fs(F2FS_M_SB(mapping), true);
1431
1432         return 0;
1433 }
1434
1435 int f2fs_write_multi_pages(struct compress_ctx *cc,
1436                                         int *submitted,
1437                                         struct writeback_control *wbc,
1438                                         enum iostat_type io_type)
1439 {
1440         int err;
1441
1442         *submitted = 0;
1443         if (cluster_may_compress(cc)) {
1444                 err = f2fs_compress_pages(cc);
1445                 if (err == -EAGAIN) {
1446                         goto write;
1447                 } else if (err) {
1448                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1449                         goto destroy_out;
1450                 }
1451
1452                 err = f2fs_write_compressed_pages(cc, submitted,
1453                                                         wbc, io_type);
1454                 if (!err)
1455                         return 0;
1456                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1457         }
1458 write:
1459         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1460
1461         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1462         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1463 destroy_out:
1464         f2fs_destroy_compress_ctx(cc, false);
1465         return err;
1466 }
1467
1468 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1469 {
1470         struct decompress_io_ctx *dic;
1471         pgoff_t start_idx = start_idx_of_cluster(cc);
1472         int i;
1473
1474         dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1475         if (!dic)
1476                 return ERR_PTR(-ENOMEM);
1477
1478         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1479         if (!dic->rpages) {
1480                 kmem_cache_free(dic_entry_slab, dic);
1481                 return ERR_PTR(-ENOMEM);
1482         }
1483
1484         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1485         dic->inode = cc->inode;
1486         atomic_set(&dic->pending_pages, cc->nr_cpages);
1487         dic->cluster_idx = cc->cluster_idx;
1488         dic->cluster_size = cc->cluster_size;
1489         dic->log_cluster_size = cc->log_cluster_size;
1490         dic->nr_cpages = cc->nr_cpages;
1491         dic->failed = false;
1492
1493         for (i = 0; i < dic->cluster_size; i++)
1494                 dic->rpages[i] = cc->rpages[i];
1495         dic->nr_rpages = cc->cluster_size;
1496
1497         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1498         if (!dic->cpages)
1499                 goto out_free;
1500
1501         for (i = 0; i < dic->nr_cpages; i++) {
1502                 struct page *page;
1503
1504                 page = f2fs_compress_alloc_page();
1505                 if (!page)
1506                         goto out_free;
1507
1508                 f2fs_set_compressed_page(page, cc->inode,
1509                                         start_idx + i + 1, dic);
1510                 dic->cpages[i] = page;
1511         }
1512
1513         return dic;
1514
1515 out_free:
1516         f2fs_free_dic(dic);
1517         return ERR_PTR(-ENOMEM);
1518 }
1519
1520 void f2fs_free_dic(struct decompress_io_ctx *dic)
1521 {
1522         int i;
1523
1524         if (dic->tpages) {
1525                 for (i = 0; i < dic->cluster_size; i++) {
1526                         if (dic->rpages[i])
1527                                 continue;
1528                         if (!dic->tpages[i])
1529                                 continue;
1530                         f2fs_compress_free_page(dic->tpages[i]);
1531                 }
1532                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1533         }
1534
1535         if (dic->cpages) {
1536                 for (i = 0; i < dic->nr_cpages; i++) {
1537                         if (!dic->cpages[i])
1538                                 continue;
1539                         f2fs_compress_free_page(dic->cpages[i]);
1540                 }
1541                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1542         }
1543
1544         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1545         kmem_cache_free(dic_entry_slab, dic);
1546 }
1547
1548 void f2fs_decompress_end_io(struct page **rpages,
1549                         unsigned int cluster_size, bool err, bool verity)
1550 {
1551         int i;
1552
1553         for (i = 0; i < cluster_size; i++) {
1554                 struct page *rpage = rpages[i];
1555
1556                 if (!rpage)
1557                         continue;
1558
1559                 if (err || PageError(rpage))
1560                         goto clear_uptodate;
1561
1562                 if (!verity || fsverity_verify_page(rpage)) {
1563                         SetPageUptodate(rpage);
1564                         goto unlock;
1565                 }
1566 clear_uptodate:
1567                 ClearPageUptodate(rpage);
1568                 ClearPageError(rpage);
1569 unlock:
1570                 unlock_page(rpage);
1571         }
1572 }
1573
1574 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1575 {
1576         dev_t dev = sbi->sb->s_bdev->bd_dev;
1577         char slab_name[35];
1578
1579         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1580
1581         sbi->page_array_slab_size = sizeof(struct page *) <<
1582                                         F2FS_OPTION(sbi).compress_log_size;
1583
1584         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1585                                         sbi->page_array_slab_size);
1586         if (!sbi->page_array_slab)
1587                 return -ENOMEM;
1588         return 0;
1589 }
1590
1591 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1592 {
1593         kmem_cache_destroy(sbi->page_array_slab);
1594 }
1595
1596 static int __init f2fs_init_cic_cache(void)
1597 {
1598         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1599                                         sizeof(struct compress_io_ctx));
1600         if (!cic_entry_slab)
1601                 return -ENOMEM;
1602         return 0;
1603 }
1604
1605 static void f2fs_destroy_cic_cache(void)
1606 {
1607         kmem_cache_destroy(cic_entry_slab);
1608 }
1609
1610 static int __init f2fs_init_dic_cache(void)
1611 {
1612         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1613                                         sizeof(struct decompress_io_ctx));
1614         if (!dic_entry_slab)
1615                 return -ENOMEM;
1616         return 0;
1617 }
1618
1619 static void f2fs_destroy_dic_cache(void)
1620 {
1621         kmem_cache_destroy(dic_entry_slab);
1622 }
1623
1624 int __init f2fs_init_compress_cache(void)
1625 {
1626         int err;
1627
1628         err = f2fs_init_cic_cache();
1629         if (err)
1630                 goto out;
1631         err = f2fs_init_dic_cache();
1632         if (err)
1633                 goto free_cic;
1634         return 0;
1635 free_cic:
1636         f2fs_destroy_cic_cache();
1637 out:
1638         return -ENOMEM;
1639 }
1640
1641 void f2fs_destroy_compress_cache(void)
1642 {
1643         f2fs_destroy_dic_cache();
1644         f2fs_destroy_cic_cache();
1645 }