fs/f2fs/compress.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * f2fs compress support
   4  *
   5  * Copyright (c) 2019 Chao Yu <chao@kernel.org>
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/writeback.h>
  12 #include <linux/backing-dev.h>
  13 #include <linux/lzo.h>
  14 #include <linux/lz4.h>
  15 #include <linux/zstd.h>
  16 #include <linux/pagevec.h>
  17
  18 #include "f2fs.h"
  19 #include "node.h"
  20 #include "segment.h"
  21 #include <trace/events/f2fs.h>
  22
  23 static struct kmem_cache *cic_entry_slab;
  24 static struct kmem_cache *dic_entry_slab;
  25
  26 static void *page_array_alloc(struct inode *inode, int nr)
  27 {
  28         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  29         unsigned int size = sizeof(struct page *) * nr;
  30
  31         if (likely(size <= sbi->page_array_slab_size))
  32                 return f2fs_kmem_cache_alloc(sbi->page_array_slab,
  33                                         GFP_F2FS_ZERO, false, F2FS_I_SB(inode));
  34         return f2fs_kzalloc(sbi, size, GFP_NOFS);
  35 }
  36
  37 static void page_array_free(struct inode *inode, void *pages, int nr)
  38 {
  39         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  40         unsigned int size = sizeof(struct page *) * nr;
  41
  42         if (!pages)
  43                 return;
  44
  45         if (likely(size <= sbi->page_array_slab_size))
  46                 kmem_cache_free(sbi->page_array_slab, pages);
  47         else
  48                 kfree(pages);
  49 }
  50
  51 struct f2fs_compress_ops {
  52         int (*init_compress_ctx)(struct compress_ctx *cc);
  53         void (*destroy_compress_ctx)(struct compress_ctx *cc);
  54         int (*compress_pages)(struct compress_ctx *cc);
  55         int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
  56         void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
  57         int (*decompress_pages)(struct decompress_io_ctx *dic);
  58         bool (*is_level_valid)(int level);
  59 };
  60
  61 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
  62 {
  63         return index & (cc->cluster_size - 1);
  64 }
  65
  66 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
  67 {
  68         return index >> cc->log_cluster_size;
  69 }
  70
  71 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
  72 {
  73         return cc->cluster_idx << cc->log_cluster_size;
  74 }
  75
  76 bool f2fs_is_compressed_page(struct page *page)
  77 {
  78         if (!PagePrivate(page))
  79                 return false;
  80         if (!page_private(page))
  81                 return false;
  82         if (page_private_nonpointer(page))
  83                 return false;
  84
  85         f2fs_bug_on(F2FS_M_SB(page->mapping),
  86                 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
  87         return true;
  88 }
  89
  90 static void f2fs_set_compressed_page(struct page *page,
  91                 struct inode *inode, pgoff_t index, void *data)
  92 {
  93         attach_page_private(page, (void *)data);
  94
  95         /* i_crypto_info and iv index */
  96         page->index = index;
  97         page->mapping = inode->i_mapping;
  98 }
  99
 100 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
 101 {
 102         int i;
 103
 104         for (i = 0; i < len; i++) {
 105                 if (!cc->rpages[i])
 106                         continue;
 107                 if (unlock)
 108                         unlock_page(cc->rpages[i]);
 109                 else
 110                         put_page(cc->rpages[i]);
 111         }
 112 }
 113
 114 static void f2fs_put_rpages(struct compress_ctx *cc)
 115 {
 116         f2fs_drop_rpages(cc, cc->cluster_size, false);
 117 }
 118
 119 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
 120 {
 121         f2fs_drop_rpages(cc, len, true);
 122 }
 123
 124 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 125                 struct writeback_control *wbc, bool redirty, int unlock)
 126 {
 127         unsigned int i;
 128
 129         for (i = 0; i < cc->cluster_size; i++) {
 130                 if (!cc->rpages[i])
 131                         continue;
 132                 if (redirty)
 133                         redirty_page_for_writepage(wbc, cc->rpages[i]);
 134                 f2fs_put_page(cc->rpages[i], unlock);
 135         }
 136 }
 137
 138 struct page *f2fs_compress_control_page(struct page *page)
 139 {
 140         return ((struct compress_io_ctx *)page_private(page))->rpages[0];
 141 }
 142
 143 int f2fs_init_compress_ctx(struct compress_ctx *cc)
 144 {
 145         if (cc->rpages)
 146                 return 0;
 147
 148         cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 149         return cc->rpages ? 0 : -ENOMEM;
 150 }
 151
 152 void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
 153 {
 154         page_array_free(cc->inode, cc->rpages, cc->cluster_size);
 155         cc->rpages = NULL;
 156         cc->nr_rpages = 0;
 157         cc->nr_cpages = 0;
 158         cc->valid_nr_cpages = 0;
 159         if (!reuse)
 160                 cc->cluster_idx = NULL_CLUSTER;
 161 }
 162
 163 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 164 {
 165         unsigned int cluster_ofs;
 166
 167         if (!f2fs_cluster_can_merge_page(cc, page->index))
 168                 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 169
 170         cluster_ofs = offset_in_cluster(cc, page->index);
 171         cc->rpages[cluster_ofs] = page;
 172         cc->nr_rpages++;
 173         cc->cluster_idx = cluster_idx(cc, page->index);
 174 }
 175
 176 #ifdef CONFIG_F2FS_FS_LZO
 177 static int lzo_init_compress_ctx(struct compress_ctx *cc)
 178 {
 179         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 180                                 LZO1X_MEM_COMPRESS, GFP_NOFS);
 181         if (!cc->private)
 182                 return -ENOMEM;
 183
 184         cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 185         return 0;
 186 }
 187
 188 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 189 {
 190         kvfree(cc->private);
 191         cc->private = NULL;
 192 }
 193
 194 static int lzo_compress_pages(struct compress_ctx *cc)
 195 {
 196         int ret;
 197
 198         ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 199                                         &cc->clen, cc->private);
 200         if (ret != LZO_E_OK) {
 201                 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
 202                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 203                 return -EIO;
 204         }
 205         return 0;
 206 }
 207
 208 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 209 {
 210         int ret;
 211
 212         ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 213                                                 dic->rbuf, &dic->rlen);
 214         if (ret != LZO_E_OK) {
 215                 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
 216                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 217                 return -EIO;
 218         }
 219
 220         if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 221                 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
 222                                         "expected:%lu\n", KERN_ERR,
 223                                         F2FS_I_SB(dic->inode)->sb->s_id,
 224                                         dic->rlen,
 225                                         PAGE_SIZE << dic->log_cluster_size);
 226                 return -EIO;
 227         }
 228         return 0;
 229 }
 230
 231 static const struct f2fs_compress_ops f2fs_lzo_ops = {
 232         .init_compress_ctx      = lzo_init_compress_ctx,
 233         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 234         .compress_pages         = lzo_compress_pages,
 235         .decompress_pages       = lzo_decompress_pages,
 236 };
 237 #endif
 238
 239 #ifdef CONFIG_F2FS_FS_LZ4
 240 static int lz4_init_compress_ctx(struct compress_ctx *cc)
 241 {
 242         unsigned int size = LZ4_MEM_COMPRESS;
 243
 244 #ifdef CONFIG_F2FS_FS_LZ4HC
 245         if (F2FS_I(cc->inode)->i_compress_level)
 246                 size = LZ4HC_MEM_COMPRESS;
 247 #endif
 248
 249         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
 250         if (!cc->private)
 251                 return -ENOMEM;
 252
 253         /*
 254          * we do not change cc->clen to LZ4_compressBound(inputsize) to
 255          * adapt worst compress case, because lz4 compressor can handle
 256          * output budget properly.
 257          */
 258         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 259         return 0;
 260 }
 261
 262 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 263 {
 264         kvfree(cc->private);
 265         cc->private = NULL;
 266 }
 267
 268 static int lz4_compress_pages(struct compress_ctx *cc)
 269 {
 270         int len = -EINVAL;
 271         unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 272
 273         if (!level)
 274                 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 275                                                 cc->clen, cc->private);
 276 #ifdef CONFIG_F2FS_FS_LZ4HC
 277         else
 278                 len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 279                                         cc->clen, level, cc->private);
 280 #endif
 281         if (len < 0)
 282                 return len;
 283         if (!len)
 284                 return -EAGAIN;
 285
 286         cc->clen = len;
 287         return 0;
 288 }
 289
 290 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 291 {
 292         int ret;
 293
 294         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 295                                                 dic->clen, dic->rlen);
 296         if (ret < 0) {
 297                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 298                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 299                 return -EIO;
 300         }
 301
 302         if (ret != PAGE_SIZE << dic->log_cluster_size) {
 303                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
 304                                         "expected:%lu\n", KERN_ERR,
 305                                         F2FS_I_SB(dic->inode)->sb->s_id, ret,
 306                                         PAGE_SIZE << dic->log_cluster_size);
 307                 return -EIO;
 308         }
 309         return 0;
 310 }
 311
 312 static bool lz4_is_level_valid(int lvl)
 313 {
 314 #ifdef CONFIG_F2FS_FS_LZ4HC
 315         return !lvl || (lvl >= LZ4HC_MIN_CLEVEL && lvl <= LZ4HC_MAX_CLEVEL);
 316 #else
 317         return lvl == 0;
 318 #endif
 319 }
 320
 321 static const struct f2fs_compress_ops f2fs_lz4_ops = {
 322         .init_compress_ctx      = lz4_init_compress_ctx,
 323         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 324         .compress_pages         = lz4_compress_pages,
 325         .decompress_pages       = lz4_decompress_pages,
 326         .is_level_valid         = lz4_is_level_valid,
 327 };
 328 #endif
 329
 330 #ifdef CONFIG_F2FS_FS_ZSTD
 331 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 332 {
 333         zstd_parameters params;
 334         zstd_cstream *stream;
 335         void *workspace;
 336         unsigned int workspace_size;
 337         unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 338
 339         /* Need to remain this for backward compatibility */
 340         if (!level)
 341                 level = F2FS_ZSTD_DEFAULT_CLEVEL;
 342
 343         params = zstd_get_params(level, cc->rlen);
 344         workspace_size = zstd_cstream_workspace_bound(&params.cParams);
 345
 346         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 347                                         workspace_size, GFP_NOFS);
 348         if (!workspace)
 349                 return -ENOMEM;
 350
 351         stream = zstd_init_cstream(&params, 0, workspace, workspace_size);
 352         if (!stream) {
 353                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n",
 354                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 355                                 __func__);
 356                 kvfree(workspace);
 357                 return -EIO;
 358         }
 359
 360         cc->private = workspace;
 361         cc->private2 = stream;
 362
 363         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 364         return 0;
 365 }
 366
 367 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 368 {
 369         kvfree(cc->private);
 370         cc->private = NULL;
 371         cc->private2 = NULL;
 372 }
 373
 374 static int zstd_compress_pages(struct compress_ctx *cc)
 375 {
 376         zstd_cstream *stream = cc->private2;
 377         zstd_in_buffer inbuf;
 378         zstd_out_buffer outbuf;
 379         int src_size = cc->rlen;
 380         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 381         int ret;
 382
 383         inbuf.pos = 0;
 384         inbuf.src = cc->rbuf;
 385         inbuf.size = src_size;
 386
 387         outbuf.pos = 0;
 388         outbuf.dst = cc->cbuf->cdata;
 389         outbuf.size = dst_size;
 390
 391         ret = zstd_compress_stream(stream, &outbuf, &inbuf);
 392         if (zstd_is_error(ret)) {
 393                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n",
 394                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 395                                 __func__, zstd_get_error_code(ret));
 396                 return -EIO;
 397         }
 398
 399         ret = zstd_end_stream(stream, &outbuf);
 400         if (zstd_is_error(ret)) {
 401                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n",
 402                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 403                                 __func__, zstd_get_error_code(ret));
 404                 return -EIO;
 405         }
 406
 407         /*
 408          * there is compressed data remained in intermediate buffer due to
 409          * no more space in cbuf.cdata
 410          */
 411         if (ret)
 412                 return -EAGAIN;
 413
 414         cc->clen = outbuf.pos;
 415         return 0;
 416 }
 417
 418 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 419 {
 420         zstd_dstream *stream;
 421         void *workspace;
 422         unsigned int workspace_size;
 423         unsigned int max_window_size =
 424                         MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 425
 426         workspace_size = zstd_dstream_workspace_bound(max_window_size);
 427
 428         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 429                                         workspace_size, GFP_NOFS);
 430         if (!workspace)
 431                 return -ENOMEM;
 432
 433         stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
 434         if (!stream) {
 435                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n",
 436                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 437                                 __func__);
 438                 kvfree(workspace);
 439                 return -EIO;
 440         }
 441
 442         dic->private = workspace;
 443         dic->private2 = stream;
 444
 445         return 0;
 446 }
 447
 448 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 449 {
 450         kvfree(dic->private);
 451         dic->private = NULL;
 452         dic->private2 = NULL;
 453 }
 454
 455 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 456 {
 457         zstd_dstream *stream = dic->private2;
 458         zstd_in_buffer inbuf;
 459         zstd_out_buffer outbuf;
 460         int ret;
 461
 462         inbuf.pos = 0;
 463         inbuf.src = dic->cbuf->cdata;
 464         inbuf.size = dic->clen;
 465
 466         outbuf.pos = 0;
 467         outbuf.dst = dic->rbuf;
 468         outbuf.size = dic->rlen;
 469
 470         ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
 471         if (zstd_is_error(ret)) {
 472                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n",
 473                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 474                                 __func__, zstd_get_error_code(ret));
 475                 return -EIO;
 476         }
 477
 478         if (dic->rlen != outbuf.pos) {
 479                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 480                                 "expected:%lu\n", KERN_ERR,
 481                                 F2FS_I_SB(dic->inode)->sb->s_id,
 482                                 __func__, dic->rlen,
 483                                 PAGE_SIZE << dic->log_cluster_size);
 484                 return -EIO;
 485         }
 486
 487         return 0;
 488 }
 489
 490 static bool zstd_is_level_valid(int lvl)
 491 {
 492         return lvl >= zstd_min_clevel() && lvl <= zstd_max_clevel();
 493 }
 494
 495 static const struct f2fs_compress_ops f2fs_zstd_ops = {
 496         .init_compress_ctx      = zstd_init_compress_ctx,
 497         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 498         .compress_pages         = zstd_compress_pages,
 499         .init_decompress_ctx    = zstd_init_decompress_ctx,
 500         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 501         .decompress_pages       = zstd_decompress_pages,
 502         .is_level_valid         = zstd_is_level_valid,
 503 };
 504 #endif
 505
 506 #ifdef CONFIG_F2FS_FS_LZO
 507 #ifdef CONFIG_F2FS_FS_LZORLE
 508 static int lzorle_compress_pages(struct compress_ctx *cc)
 509 {
 510         int ret;
 511
 512         ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 513                                         &cc->clen, cc->private);
 514         if (ret != LZO_E_OK) {
 515                 f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
 516                                 "lzo-rle compress failed, ret:%d", ret);
 517                 return -EIO;
 518         }
 519         return 0;
 520 }
 521
 522 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 523         .init_compress_ctx      = lzo_init_compress_ctx,
 524         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 525         .compress_pages         = lzorle_compress_pages,
 526         .decompress_pages       = lzo_decompress_pages,
 527 };
 528 #endif
 529 #endif
 530
 531 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 532 #ifdef CONFIG_F2FS_FS_LZO
 533         &f2fs_lzo_ops,
 534 #else
 535         NULL,
 536 #endif
 537 #ifdef CONFIG_F2FS_FS_LZ4
 538         &f2fs_lz4_ops,
 539 #else
 540         NULL,
 541 #endif
 542 #ifdef CONFIG_F2FS_FS_ZSTD
 543         &f2fs_zstd_ops,
 544 #else
 545         NULL,
 546 #endif
 547 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 548         &f2fs_lzorle_ops,
 549 #else
 550         NULL,
 551 #endif
 552 };
 553
 554 bool f2fs_is_compress_backend_ready(struct inode *inode)
 555 {
 556         if (!f2fs_compressed_file(inode))
 557                 return true;
 558         return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 559 }
 560
 561 bool f2fs_is_compress_level_valid(int alg, int lvl)
 562 {
 563         const struct f2fs_compress_ops *cops = f2fs_cops[alg];
 564
 565         if (cops->is_level_valid)
 566                 return cops->is_level_valid(lvl);
 567
 568         return lvl == 0;
 569 }
 570
 571 static mempool_t *compress_page_pool;
 572 static int num_compress_pages = 512;
 573 module_param(num_compress_pages, uint, 0444);
 574 MODULE_PARM_DESC(num_compress_pages,
 575                 "Number of intermediate compress pages to preallocate");
 576
 577 int __init f2fs_init_compress_mempool(void)
 578 {
 579         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 580         return compress_page_pool ? 0 : -ENOMEM;
 581 }
 582
 583 void f2fs_destroy_compress_mempool(void)
 584 {
 585         mempool_destroy(compress_page_pool);
 586 }
 587
 588 static struct page *f2fs_compress_alloc_page(void)
 589 {
 590         struct page *page;
 591
 592         page = mempool_alloc(compress_page_pool, GFP_NOFS);
 593         lock_page(page);
 594
 595         return page;
 596 }
 597
 598 static void f2fs_compress_free_page(struct page *page)
 599 {
 600         if (!page)
 601                 return;
 602         detach_page_private(page);
 603         page->mapping = NULL;
 604         unlock_page(page);
 605         mempool_free(page, compress_page_pool);
 606 }
 607
 608 #define MAX_VMAP_RETRIES        3
 609
 610 static void *f2fs_vmap(struct page **pages, unsigned int count)
 611 {
 612         int i;
 613         void *buf = NULL;
 614
 615         for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 616                 buf = vm_map_ram(pages, count, -1);
 617                 if (buf)
 618                         break;
 619                 vm_unmap_aliases();
 620         }
 621         return buf;
 622 }
 623
 624 static int f2fs_compress_pages(struct compress_ctx *cc)
 625 {
 626         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 627         const struct f2fs_compress_ops *cops =
 628                                 f2fs_cops[fi->i_compress_algorithm];
 629         unsigned int max_len, new_nr_cpages;
 630         u32 chksum = 0;
 631         int i, ret;
 632
 633         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 634                                 cc->cluster_size, fi->i_compress_algorithm);
 635
 636         if (cops->init_compress_ctx) {
 637                 ret = cops->init_compress_ctx(cc);
 638                 if (ret)
 639                         goto out;
 640         }
 641
 642         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 643         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 644         cc->valid_nr_cpages = cc->nr_cpages;
 645
 646         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 647         if (!cc->cpages) {
 648                 ret = -ENOMEM;
 649                 goto destroy_compress_ctx;
 650         }
 651
 652         for (i = 0; i < cc->nr_cpages; i++)
 653                 cc->cpages[i] = f2fs_compress_alloc_page();
 654
 655         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 656         if (!cc->rbuf) {
 657                 ret = -ENOMEM;
 658                 goto out_free_cpages;
 659         }
 660
 661         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 662         if (!cc->cbuf) {
 663                 ret = -ENOMEM;
 664                 goto out_vunmap_rbuf;
 665         }
 666
 667         ret = cops->compress_pages(cc);
 668         if (ret)
 669                 goto out_vunmap_cbuf;
 670
 671         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 672
 673         if (cc->clen > max_len) {
 674                 ret = -EAGAIN;
 675                 goto out_vunmap_cbuf;
 676         }
 677
 678         cc->cbuf->clen = cpu_to_le32(cc->clen);
 679
 680         if (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))
 681                 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
 682                                         cc->cbuf->cdata, cc->clen);
 683         cc->cbuf->chksum = cpu_to_le32(chksum);
 684
 685         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 686                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 687
 688         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 689
 690         /* zero out any unused part of the last page */
 691         memset(&cc->cbuf->cdata[cc->clen], 0,
 692                         (new_nr_cpages * PAGE_SIZE) -
 693                         (cc->clen + COMPRESS_HEADER_SIZE));
 694
 695         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 696         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 697
 698         for (i = new_nr_cpages; i < cc->nr_cpages; i++) {
 699                 f2fs_compress_free_page(cc->cpages[i]);
 700                 cc->cpages[i] = NULL;
 701         }
 702
 703         if (cops->destroy_compress_ctx)
 704                 cops->destroy_compress_ctx(cc);
 705
 706         cc->valid_nr_cpages = new_nr_cpages;
 707
 708         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 709                                                         cc->clen, ret);
 710         return 0;
 711
 712 out_vunmap_cbuf:
 713         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 714 out_vunmap_rbuf:
 715         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 716 out_free_cpages:
 717         for (i = 0; i < cc->nr_cpages; i++) {
 718                 if (cc->cpages[i])
 719                         f2fs_compress_free_page(cc->cpages[i]);
 720         }
 721         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 722         cc->cpages = NULL;
 723 destroy_compress_ctx:
 724         if (cops->destroy_compress_ctx)
 725                 cops->destroy_compress_ctx(cc);
 726 out:
 727         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 728                                                         cc->clen, ret);
 729         return ret;
 730 }
 731
 732 static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
 733                 bool pre_alloc);
 734 static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
 735                 bool bypass_destroy_callback, bool pre_alloc);
 736
 737 void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
 738 {
 739         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 740         struct f2fs_inode_info *fi = F2FS_I(dic->inode);
 741         const struct f2fs_compress_ops *cops =
 742                         f2fs_cops[fi->i_compress_algorithm];
 743         bool bypass_callback = false;
 744         int ret;
 745
 746         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 747                                 dic->cluster_size, fi->i_compress_algorithm);
 748
 749         if (dic->failed) {
 750                 ret = -EIO;
 751                 goto out_end_io;
 752         }
 753
 754         ret = f2fs_prepare_decomp_mem(dic, false);
 755         if (ret) {
 756                 bypass_callback = true;
 757                 goto out_release;
 758         }
 759
 760         dic->clen = le32_to_cpu(dic->cbuf->clen);
 761         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 762
 763         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 764                 ret = -EFSCORRUPTED;
 765
 766                 /* Avoid f2fs_commit_super in irq context */
 767                 if (!in_task)
 768                         f2fs_handle_error_async(sbi, ERROR_FAIL_DECOMPRESSION);
 769                 else
 770                         f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
 771                 goto out_release;
 772         }
 773
 774         ret = cops->decompress_pages(dic);
 775
 776         if (!ret && (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))) {
 777                 u32 provided = le32_to_cpu(dic->cbuf->chksum);
 778                 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
 779
 780                 if (provided != calculated) {
 781                         if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 782                                 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 783                                 f2fs_info_ratelimited(sbi,
 784                                         "checksum invalid, nid = %lu, %x vs %x",
 785                                         dic->inode->i_ino,
 786                                         provided, calculated);
 787                         }
 788                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 789                 }
 790         }
 791
 792 out_release:
 793         f2fs_release_decomp_mem(dic, bypass_callback, false);
 794
 795 out_end_io:
 796         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 797                                                         dic->clen, ret);
 798         f2fs_decompress_end_io(dic, ret, in_task);
 799 }
 800
 801 /*
 802  * This is called when a page of a compressed cluster has been read from disk
 803  * (or failed to be read from disk).  It checks whether this page was the last
 804  * page being waited on in the cluster, and if so, it decompresses the cluster
 805  * (or in the case of a failure, cleans up without actually decompressing).
 806  */
 807 void f2fs_end_read_compressed_page(struct page *page, bool failed,
 808                 block_t blkaddr, bool in_task)
 809 {
 810         struct decompress_io_ctx *dic =
 811                         (struct decompress_io_ctx *)page_private(page);
 812         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 813
 814         dec_page_count(sbi, F2FS_RD_DATA);
 815
 816         if (failed)
 817                 WRITE_ONCE(dic->failed, true);
 818         else if (blkaddr && in_task)
 819                 f2fs_cache_compressed_page(sbi, page,
 820                                         dic->inode->i_ino, blkaddr);
 821
 822         if (atomic_dec_and_test(&dic->remaining_pages))
 823                 f2fs_decompress_cluster(dic, in_task);
 824 }
 825
 826 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 827 {
 828         if (cc->cluster_idx == NULL_CLUSTER)
 829                 return true;
 830         return cc->cluster_idx == cluster_idx(cc, index);
 831 }
 832
 833 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 834 {
 835         return cc->nr_rpages == 0;
 836 }
 837
 838 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 839 {
 840         return cc->cluster_size == cc->nr_rpages;
 841 }
 842
 843 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 844 {
 845         if (f2fs_cluster_is_empty(cc))
 846                 return true;
 847         return is_page_in_cluster(cc, index);
 848 }
 849
 850 bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
 851                                 int index, int nr_pages, bool uptodate)
 852 {
 853         unsigned long pgidx = pages[index]->index;
 854         int i = uptodate ? 0 : 1;
 855
 856         /*
 857          * when uptodate set to true, try to check all pages in cluster is
 858          * uptodate or not.
 859          */
 860         if (uptodate && (pgidx % cc->cluster_size))
 861                 return false;
 862
 863         if (nr_pages - index < cc->cluster_size)
 864                 return false;
 865
 866         for (; i < cc->cluster_size; i++) {
 867                 if (pages[index + i]->index != pgidx + i)
 868                         return false;
 869                 if (uptodate && !PageUptodate(pages[index + i]))
 870                         return false;
 871         }
 872
 873         return true;
 874 }
 875
 876 static bool cluster_has_invalid_data(struct compress_ctx *cc)
 877 {
 878         loff_t i_size = i_size_read(cc->inode);
 879         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 880         int i;
 881
 882         for (i = 0; i < cc->cluster_size; i++) {
 883                 struct page *page = cc->rpages[i];
 884
 885                 f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
 886
 887                 /* beyond EOF */
 888                 if (page->index >= nr_pages)
 889                         return true;
 890         }
 891         return false;
 892 }
 893
 894 bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
 895 {
 896 #ifdef CONFIG_F2FS_CHECK_FS
 897         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 898         unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
 899         int cluster_end = 0;
 900         unsigned int count;
 901         int i;
 902         char *reason = "";
 903
 904         if (dn->data_blkaddr != COMPRESS_ADDR)
 905                 return false;
 906
 907         /* [..., COMPR_ADDR, ...] */
 908         if (dn->ofs_in_node % cluster_size) {
 909                 reason = "[*|C|*|*]";
 910                 goto out;
 911         }
 912
 913         for (i = 1, count = 1; i < cluster_size; i++, count++) {
 914                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
 915                                                         dn->ofs_in_node + i);
 916
 917                 /* [COMPR_ADDR, ..., COMPR_ADDR] */
 918                 if (blkaddr == COMPRESS_ADDR) {
 919                         reason = "[C|*|C|*]";
 920                         goto out;
 921                 }
 922                 if (!__is_valid_data_blkaddr(blkaddr)) {
 923                         if (!cluster_end)
 924                                 cluster_end = i;
 925                         continue;
 926                 }
 927                 /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
 928                 if (cluster_end) {
 929                         reason = "[C|N|N|V]";
 930                         goto out;
 931                 }
 932         }
 933
 934         f2fs_bug_on(F2FS_I_SB(dn->inode), count != cluster_size &&
 935                 !is_inode_flag_set(dn->inode, FI_COMPRESS_RELEASED));
 936
 937         return false;
 938 out:
 939         f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
 940                         dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
 941         set_sbi_flag(sbi, SBI_NEED_FSCK);
 942         return true;
 943 #else
 944         return false;
 945 #endif
 946 }
 947
 948 static int __f2fs_get_cluster_blocks(struct inode *inode,
 949                                         struct dnode_of_data *dn)
 950 {
 951         unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
 952         int count, i;
 953
 954         for (i = 1, count = 1; i < cluster_size; i++) {
 955                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
 956                                                         dn->ofs_in_node + i);
 957
 958                 if (__is_valid_data_blkaddr(blkaddr))
 959                         count++;
 960         }
 961
 962         return count;
 963 }
 964
 965 static int __f2fs_cluster_blocks(struct inode *inode,
 966                                 unsigned int cluster_idx, bool compr_blks)
 967 {
 968         struct dnode_of_data dn;
 969         unsigned int start_idx = cluster_idx <<
 970                                 F2FS_I(inode)->i_log_cluster_size;
 971         int ret;
 972
 973         set_new_dnode(&dn, inode, NULL, NULL, 0);
 974         ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
 975         if (ret) {
 976                 if (ret == -ENOENT)
 977                         ret = 0;
 978                 goto fail;
 979         }
 980
 981         if (f2fs_sanity_check_cluster(&dn)) {
 982                 ret = -EFSCORRUPTED;
 983                 goto fail;
 984         }
 985
 986         if (dn.data_blkaddr == COMPRESS_ADDR) {
 987                 if (compr_blks)
 988                         ret = __f2fs_get_cluster_blocks(inode, &dn);
 989                 else
 990                         ret = 1;
 991         }
 992 fail:
 993         f2fs_put_dnode(&dn);
 994         return ret;
 995 }
 996
 997 /* return # of compressed blocks in compressed cluster */
 998 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 999 {
1000         return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
1001 }
1002
1003 /* return whether cluster is compressed one or not */
1004 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
1005 {
1006         return __f2fs_cluster_blocks(inode,
1007                 index >> F2FS_I(inode)->i_log_cluster_size,
1008                 false);
1009 }
1010
1011 static bool cluster_may_compress(struct compress_ctx *cc)
1012 {
1013         if (!f2fs_need_compress_data(cc->inode))
1014                 return false;
1015         if (f2fs_is_atomic_file(cc->inode))
1016                 return false;
1017         if (!f2fs_cluster_is_full(cc))
1018                 return false;
1019         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
1020                 return false;
1021         return !cluster_has_invalid_data(cc);
1022 }
1023
1024 static void set_cluster_writeback(struct compress_ctx *cc)
1025 {
1026         int i;
1027
1028         for (i = 0; i < cc->cluster_size; i++) {
1029                 if (cc->rpages[i])
1030                         set_page_writeback(cc->rpages[i]);
1031         }
1032 }
1033
1034 static void set_cluster_dirty(struct compress_ctx *cc)
1035 {
1036         int i;
1037
1038         for (i = 0; i < cc->cluster_size; i++)
1039                 if (cc->rpages[i]) {
1040                         set_page_dirty(cc->rpages[i]);
1041                         set_page_private_gcing(cc->rpages[i]);
1042                 }
1043 }
1044
1045 static int prepare_compress_overwrite(struct compress_ctx *cc,
1046                 struct page **pagep, pgoff_t index, void **fsdata)
1047 {
1048         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1049         struct address_space *mapping = cc->inode->i_mapping;
1050         struct page *page;
1051         sector_t last_block_in_bio;
1052         fgf_t fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1053         pgoff_t start_idx = start_idx_of_cluster(cc);
1054         int i, ret;
1055
1056 retry:
1057         ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
1058         if (ret <= 0)
1059                 return ret;
1060
1061         ret = f2fs_init_compress_ctx(cc);
1062         if (ret)
1063                 return ret;
1064
1065         /* keep page reference to avoid page reclaim */
1066         for (i = 0; i < cc->cluster_size; i++) {
1067                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1068                                                         fgp_flag, GFP_NOFS);
1069                 if (!page) {
1070                         ret = -ENOMEM;
1071                         goto unlock_pages;
1072                 }
1073
1074                 if (PageUptodate(page))
1075                         f2fs_put_page(page, 1);
1076                 else
1077                         f2fs_compress_ctx_add_page(cc, page);
1078         }
1079
1080         if (!f2fs_cluster_is_empty(cc)) {
1081                 struct bio *bio = NULL;
1082
1083                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1084                                         &last_block_in_bio, false, true);
1085                 f2fs_put_rpages(cc);
1086                 f2fs_destroy_compress_ctx(cc, true);
1087                 if (ret)
1088                         goto out;
1089                 if (bio)
1090                         f2fs_submit_read_bio(sbi, bio, DATA);
1091
1092                 ret = f2fs_init_compress_ctx(cc);
1093                 if (ret)
1094                         goto out;
1095         }
1096
1097         for (i = 0; i < cc->cluster_size; i++) {
1098                 f2fs_bug_on(sbi, cc->rpages[i]);
1099
1100                 page = find_lock_page(mapping, start_idx + i);
1101                 if (!page) {
1102                         /* page can be truncated */
1103                         goto release_and_retry;
1104                 }
1105
1106                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1107                 f2fs_compress_ctx_add_page(cc, page);
1108
1109                 if (!PageUptodate(page)) {
1110 release_and_retry:
1111                         f2fs_put_rpages(cc);
1112                         f2fs_unlock_rpages(cc, i + 1);
1113                         f2fs_destroy_compress_ctx(cc, true);
1114                         goto retry;
1115                 }
1116         }
1117
1118         if (likely(!ret)) {
1119                 *fsdata = cc->rpages;
1120                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1121                 return cc->cluster_size;
1122         }
1123
1124 unlock_pages:
1125         f2fs_put_rpages(cc);
1126         f2fs_unlock_rpages(cc, i);
1127         f2fs_destroy_compress_ctx(cc, true);
1128 out:
1129         return ret;
1130 }
1131
1132 int f2fs_prepare_compress_overwrite(struct inode *inode,
1133                 struct page **pagep, pgoff_t index, void **fsdata)
1134 {
1135         struct compress_ctx cc = {
1136                 .inode = inode,
1137                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1138                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1139                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1140                 .rpages = NULL,
1141                 .nr_rpages = 0,
1142         };
1143
1144         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1145 }
1146
1147 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1148                                         pgoff_t index, unsigned copied)
1149
1150 {
1151         struct compress_ctx cc = {
1152                 .inode = inode,
1153                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1154                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1155                 .rpages = fsdata,
1156         };
1157         bool first_index = (index == cc.rpages[0]->index);
1158
1159         if (copied)
1160                 set_cluster_dirty(&cc);
1161
1162         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1163         f2fs_destroy_compress_ctx(&cc, false);
1164
1165         return first_index;
1166 }
1167
1168 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1169 {
1170         void *fsdata = NULL;
1171         struct page *pagep;
1172         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1173         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1174                                                         log_cluster_size;
1175         int err;
1176
1177         err = f2fs_is_compressed_cluster(inode, start_idx);
1178         if (err < 0)
1179                 return err;
1180
1181         /* truncate normal cluster */
1182         if (!err)
1183                 return f2fs_do_truncate_blocks(inode, from, lock);
1184
1185         /* truncate compressed cluster */
1186         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1187                                                 start_idx, &fsdata);
1188
1189         /* should not be a normal cluster */
1190         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1191
1192         if (err <= 0)
1193                 return err;
1194
1195         if (err > 0) {
1196                 struct page **rpages = fsdata;
1197                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1198                 int i;
1199
1200                 for (i = cluster_size - 1; i >= 0; i--) {
1201                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1202
1203                         if (from <= start) {
1204                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1205                         } else {
1206                                 zero_user_segment(rpages[i], from - start,
1207                                                                 PAGE_SIZE);
1208                                 break;
1209                         }
1210                 }
1211
1212                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1213         }
1214         return 0;
1215 }
1216
1217 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1218                                         int *submitted,
1219                                         struct writeback_control *wbc,
1220                                         enum iostat_type io_type)
1221 {
1222         struct inode *inode = cc->inode;
1223         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1224         struct f2fs_inode_info *fi = F2FS_I(inode);
1225         struct f2fs_io_info fio = {
1226                 .sbi = sbi,
1227                 .ino = cc->inode->i_ino,
1228                 .type = DATA,
1229                 .op = REQ_OP_WRITE,
1230                 .op_flags = wbc_to_write_flags(wbc),
1231                 .old_blkaddr = NEW_ADDR,
1232                 .page = NULL,
1233                 .encrypted_page = NULL,
1234                 .compressed_page = NULL,
1235                 .submitted = 0,
1236                 .io_type = io_type,
1237                 .io_wbc = wbc,
1238                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode) ?
1239                                                                         1 : 0,
1240         };
1241         struct dnode_of_data dn;
1242         struct node_info ni;
1243         struct compress_io_ctx *cic;
1244         pgoff_t start_idx = start_idx_of_cluster(cc);
1245         unsigned int last_index = cc->cluster_size - 1;
1246         loff_t psize;
1247         int i, err;
1248         bool quota_inode = IS_NOQUOTA(inode);
1249
1250         /* we should bypass data pages to proceed the kworker jobs */
1251         if (unlikely(f2fs_cp_error(sbi))) {
1252                 mapping_set_error(cc->rpages[0]->mapping, -EIO);
1253                 goto out_free;
1254         }
1255
1256         if (quota_inode) {
1257                 /*
1258                  * We need to wait for node_write to avoid block allocation during
1259                  * checkpoint. This can only happen to quota writes which can cause
1260                  * the below discard race condition.
1261                  */
1262                 f2fs_down_read(&sbi->node_write);
1263         } else if (!f2fs_trylock_op(sbi)) {
1264                 goto out_free;
1265         }
1266
1267         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1268
1269         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1270         if (err)
1271                 goto out_unlock_op;
1272
1273         for (i = 0; i < cc->cluster_size; i++) {
1274                 if (data_blkaddr(dn.inode, dn.node_page,
1275                                         dn.ofs_in_node + i) == NULL_ADDR)
1276                         goto out_put_dnode;
1277         }
1278
1279         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1280
1281         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
1282         if (err)
1283                 goto out_put_dnode;
1284
1285         fio.version = ni.version;
1286
1287         cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1288         if (!cic)
1289                 goto out_put_dnode;
1290
1291         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1292         cic->inode = inode;
1293         atomic_set(&cic->pending_pages, cc->valid_nr_cpages);
1294         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1295         if (!cic->rpages)
1296                 goto out_put_cic;
1297
1298         cic->nr_rpages = cc->cluster_size;
1299
1300         for (i = 0; i < cc->valid_nr_cpages; i++) {
1301                 f2fs_set_compressed_page(cc->cpages[i], inode,
1302                                         cc->rpages[i + 1]->index, cic);
1303                 fio.compressed_page = cc->cpages[i];
1304
1305                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1306                                                 dn.ofs_in_node + i + 1);
1307
1308                 /* wait for GCed page writeback via META_MAPPING */
1309                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1310
1311                 if (fio.encrypted) {
1312                         fio.page = cc->rpages[i + 1];
1313                         err = f2fs_encrypt_one_page(&fio);
1314                         if (err)
1315                                 goto out_destroy_crypt;
1316                         cc->cpages[i] = fio.encrypted_page;
1317                 }
1318         }
1319
1320         set_cluster_writeback(cc);
1321
1322         for (i = 0; i < cc->cluster_size; i++)
1323                 cic->rpages[i] = cc->rpages[i];
1324
1325         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1326                 block_t blkaddr;
1327
1328                 blkaddr = f2fs_data_blkaddr(&dn);
1329                 fio.page = cc->rpages[i];
1330                 fio.old_blkaddr = blkaddr;
1331
1332                 /* cluster header */
1333                 if (i == 0) {
1334                         if (blkaddr == COMPRESS_ADDR)
1335                                 fio.compr_blocks++;
1336                         if (__is_valid_data_blkaddr(blkaddr))
1337                                 f2fs_invalidate_blocks(sbi, blkaddr);
1338                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1339                         goto unlock_continue;
1340                 }
1341
1342                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1343                         fio.compr_blocks++;
1344
1345                 if (i > cc->valid_nr_cpages) {
1346                         if (__is_valid_data_blkaddr(blkaddr)) {
1347                                 f2fs_invalidate_blocks(sbi, blkaddr);
1348                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1349                         }
1350                         goto unlock_continue;
1351                 }
1352
1353                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1354
1355                 if (fio.encrypted)
1356                         fio.encrypted_page = cc->cpages[i - 1];
1357                 else
1358                         fio.compressed_page = cc->cpages[i - 1];
1359
1360                 cc->cpages[i - 1] = NULL;
1361                 f2fs_outplace_write_data(&dn, &fio);
1362                 (*submitted)++;
1363 unlock_continue:
1364                 inode_dec_dirty_pages(cc->inode);
1365                 unlock_page(fio.page);
1366         }
1367
1368         if (fio.compr_blocks)
1369                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1370         f2fs_i_compr_blocks_update(inode, cc->valid_nr_cpages, true);
1371         add_compr_block_stat(inode, cc->valid_nr_cpages);
1372
1373         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1374
1375         f2fs_put_dnode(&dn);
1376         if (quota_inode)
1377                 f2fs_up_read(&sbi->node_write);
1378         else
1379                 f2fs_unlock_op(sbi);
1380
1381         spin_lock(&fi->i_size_lock);
1382         if (fi->last_disk_size < psize)
1383                 fi->last_disk_size = psize;
1384         spin_unlock(&fi->i_size_lock);
1385
1386         f2fs_put_rpages(cc);
1387         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1388         cc->cpages = NULL;
1389         f2fs_destroy_compress_ctx(cc, false);
1390         return 0;
1391
1392 out_destroy_crypt:
1393         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1394
1395         for (--i; i >= 0; i--)
1396                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1397 out_put_cic:
1398         kmem_cache_free(cic_entry_slab, cic);
1399 out_put_dnode:
1400         f2fs_put_dnode(&dn);
1401 out_unlock_op:
1402         if (quota_inode)
1403                 f2fs_up_read(&sbi->node_write);
1404         else
1405                 f2fs_unlock_op(sbi);
1406 out_free:
1407         for (i = 0; i < cc->valid_nr_cpages; i++) {
1408                 f2fs_compress_free_page(cc->cpages[i]);
1409                 cc->cpages[i] = NULL;
1410         }
1411         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1412         cc->cpages = NULL;
1413         return -EAGAIN;
1414 }
1415
1416 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1417 {
1418         struct f2fs_sb_info *sbi = bio->bi_private;
1419         struct compress_io_ctx *cic =
1420                         (struct compress_io_ctx *)page_private(page);
1421         enum count_type type = WB_DATA_TYPE(page,
1422                                 f2fs_is_compressed_page(page));
1423         int i;
1424
1425         if (unlikely(bio->bi_status))
1426                 mapping_set_error(cic->inode->i_mapping, -EIO);
1427
1428         f2fs_compress_free_page(page);
1429
1430         dec_page_count(sbi, type);
1431
1432         if (atomic_dec_return(&cic->pending_pages))
1433                 return;
1434
1435         for (i = 0; i < cic->nr_rpages; i++) {
1436                 WARN_ON(!cic->rpages[i]);
1437                 clear_page_private_gcing(cic->rpages[i]);
1438                 end_page_writeback(cic->rpages[i]);
1439         }
1440
1441         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1442         kmem_cache_free(cic_entry_slab, cic);
1443 }
1444
1445 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1446                                         int *submitted_p,
1447                                         struct writeback_control *wbc,
1448                                         enum iostat_type io_type)
1449 {
1450         struct address_space *mapping = cc->inode->i_mapping;
1451         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
1452         int submitted, compr_blocks, i;
1453         int ret = 0;
1454
1455         compr_blocks = f2fs_compressed_blocks(cc);
1456
1457         for (i = 0; i < cc->cluster_size; i++) {
1458                 if (!cc->rpages[i])
1459                         continue;
1460
1461                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1462                 unlock_page(cc->rpages[i]);
1463         }
1464
1465         if (compr_blocks < 0)
1466                 return compr_blocks;
1467
1468         /* overwrite compressed cluster w/ normal cluster */
1469         if (compr_blocks > 0)
1470                 f2fs_lock_op(sbi);
1471
1472         for (i = 0; i < cc->cluster_size; i++) {
1473                 if (!cc->rpages[i])
1474                         continue;
1475 retry_write:
1476                 lock_page(cc->rpages[i]);
1477
1478                 if (cc->rpages[i]->mapping != mapping) {
1479 continue_unlock:
1480                         unlock_page(cc->rpages[i]);
1481                         continue;
1482                 }
1483
1484                 if (!PageDirty(cc->rpages[i]))
1485                         goto continue_unlock;
1486
1487                 if (PageWriteback(cc->rpages[i])) {
1488                         if (wbc->sync_mode == WB_SYNC_NONE)
1489                                 goto continue_unlock;
1490                         f2fs_wait_on_page_writeback(cc->rpages[i], DATA, true, true);
1491                 }
1492
1493                 if (!clear_page_dirty_for_io(cc->rpages[i]))
1494                         goto continue_unlock;
1495
1496                 ret = f2fs_write_single_data_page(cc->rpages[i], &submitted,
1497                                                 NULL, NULL, wbc, io_type,
1498                                                 compr_blocks, false);
1499                 if (ret) {
1500                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1501                                 unlock_page(cc->rpages[i]);
1502                                 ret = 0;
1503                         } else if (ret == -EAGAIN) {
1504                                 ret = 0;
1505                                 /*
1506                                  * for quota file, just redirty left pages to
1507                                  * avoid deadlock caused by cluster update race
1508                                  * from foreground operation.
1509                                  */
1510                                 if (IS_NOQUOTA(cc->inode))
1511                                         goto out;
1512                                 f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
1513                                 goto retry_write;
1514                         }
1515                         goto out;
1516                 }
1517
1518                 *submitted_p += submitted;
1519         }
1520
1521 out:
1522         if (compr_blocks > 0)
1523                 f2fs_unlock_op(sbi);
1524
1525         f2fs_balance_fs(sbi, true);
1526         return ret;
1527 }
1528
1529 int f2fs_write_multi_pages(struct compress_ctx *cc,
1530                                         int *submitted,
1531                                         struct writeback_control *wbc,
1532                                         enum iostat_type io_type)
1533 {
1534         int err;
1535
1536         *submitted = 0;
1537         if (cluster_may_compress(cc)) {
1538                 err = f2fs_compress_pages(cc);
1539                 if (err == -EAGAIN) {
1540                         add_compr_block_stat(cc->inode, cc->cluster_size);
1541                         goto write;
1542                 } else if (err) {
1543                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1544                         goto destroy_out;
1545                 }
1546
1547                 err = f2fs_write_compressed_pages(cc, submitted,
1548                                                         wbc, io_type);
1549                 if (!err)
1550                         return 0;
1551                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1552         }
1553 write:
1554         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1555
1556         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1557         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1558 destroy_out:
1559         f2fs_destroy_compress_ctx(cc, false);
1560         return err;
1561 }
1562
1563 static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
1564                 bool pre_alloc)
1565 {
1566         return pre_alloc ^ f2fs_low_mem_mode(sbi);
1567 }
1568
1569 static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
1570                 bool pre_alloc)
1571 {
1572         const struct f2fs_compress_ops *cops =
1573                 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1574         int i;
1575
1576         if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1577                 return 0;
1578
1579         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
1580         if (!dic->tpages)
1581                 return -ENOMEM;
1582
1583         for (i = 0; i < dic->cluster_size; i++) {
1584                 if (dic->rpages[i]) {
1585                         dic->tpages[i] = dic->rpages[i];
1586                         continue;
1587                 }
1588
1589                 dic->tpages[i] = f2fs_compress_alloc_page();
1590         }
1591
1592         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
1593         if (!dic->rbuf)
1594                 return -ENOMEM;
1595
1596         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
1597         if (!dic->cbuf)
1598                 return -ENOMEM;
1599
1600         if (cops->init_decompress_ctx)
1601                 return cops->init_decompress_ctx(dic);
1602
1603         return 0;
1604 }
1605
1606 static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
1607                 bool bypass_destroy_callback, bool pre_alloc)
1608 {
1609         const struct f2fs_compress_ops *cops =
1610                 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1611
1612         if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1613                 return;
1614
1615         if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
1616                 cops->destroy_decompress_ctx(dic);
1617
1618         if (dic->cbuf)
1619                 vm_unmap_ram(dic->cbuf, dic->nr_cpages);
1620
1621         if (dic->rbuf)
1622                 vm_unmap_ram(dic->rbuf, dic->cluster_size);
1623 }
1624
1625 static void f2fs_free_dic(struct decompress_io_ctx *dic,
1626                 bool bypass_destroy_callback);
1627
1628 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1629 {
1630         struct decompress_io_ctx *dic;
1631         pgoff_t start_idx = start_idx_of_cluster(cc);
1632         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1633         int i, ret;
1634
1635         dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1636         if (!dic)
1637                 return ERR_PTR(-ENOMEM);
1638
1639         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1640         if (!dic->rpages) {
1641                 kmem_cache_free(dic_entry_slab, dic);
1642                 return ERR_PTR(-ENOMEM);
1643         }
1644
1645         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1646         dic->inode = cc->inode;
1647         atomic_set(&dic->remaining_pages, cc->nr_cpages);
1648         dic->cluster_idx = cc->cluster_idx;
1649         dic->cluster_size = cc->cluster_size;
1650         dic->log_cluster_size = cc->log_cluster_size;
1651         dic->nr_cpages = cc->nr_cpages;
1652         refcount_set(&dic->refcnt, 1);
1653         dic->failed = false;
1654         dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1655
1656         for (i = 0; i < dic->cluster_size; i++)
1657                 dic->rpages[i] = cc->rpages[i];
1658         dic->nr_rpages = cc->cluster_size;
1659
1660         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1661         if (!dic->cpages) {
1662                 ret = -ENOMEM;
1663                 goto out_free;
1664         }
1665
1666         for (i = 0; i < dic->nr_cpages; i++) {
1667                 struct page *page;
1668
1669                 page = f2fs_compress_alloc_page();
1670                 f2fs_set_compressed_page(page, cc->inode,
1671                                         start_idx + i + 1, dic);
1672                 dic->cpages[i] = page;
1673         }
1674
1675         ret = f2fs_prepare_decomp_mem(dic, true);
1676         if (ret)
1677                 goto out_free;
1678
1679         return dic;
1680
1681 out_free:
1682         f2fs_free_dic(dic, true);
1683         return ERR_PTR(ret);
1684 }
1685
1686 static void f2fs_free_dic(struct decompress_io_ctx *dic,
1687                 bool bypass_destroy_callback)
1688 {
1689         int i;
1690
1691         f2fs_release_decomp_mem(dic, bypass_destroy_callback, true);
1692
1693         if (dic->tpages) {
1694                 for (i = 0; i < dic->cluster_size; i++) {
1695                         if (dic->rpages[i])
1696                                 continue;
1697                         if (!dic->tpages[i])
1698                                 continue;
1699                         f2fs_compress_free_page(dic->tpages[i]);
1700                 }
1701                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1702         }
1703
1704         if (dic->cpages) {
1705                 for (i = 0; i < dic->nr_cpages; i++) {
1706                         if (!dic->cpages[i])
1707                                 continue;
1708                         f2fs_compress_free_page(dic->cpages[i]);
1709                 }
1710                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1711         }
1712
1713         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1714         kmem_cache_free(dic_entry_slab, dic);
1715 }
1716
1717 static void f2fs_late_free_dic(struct work_struct *work)
1718 {
1719         struct decompress_io_ctx *dic =
1720                 container_of(work, struct decompress_io_ctx, free_work);
1721
1722         f2fs_free_dic(dic, false);
1723 }
1724
1725 static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
1726 {
1727         if (refcount_dec_and_test(&dic->refcnt)) {
1728                 if (in_task) {
1729                         f2fs_free_dic(dic, false);
1730                 } else {
1731                         INIT_WORK(&dic->free_work, f2fs_late_free_dic);
1732                         queue_work(F2FS_I_SB(dic->inode)->post_read_wq,
1733                                         &dic->free_work);
1734                 }
1735         }
1736 }
1737
1738 static void f2fs_verify_cluster(struct work_struct *work)
1739 {
1740         struct decompress_io_ctx *dic =
1741                 container_of(work, struct decompress_io_ctx, verity_work);
1742         int i;
1743
1744         /* Verify, update, and unlock the decompressed pages. */
1745         for (i = 0; i < dic->cluster_size; i++) {
1746                 struct page *rpage = dic->rpages[i];
1747
1748                 if (!rpage)
1749                         continue;
1750
1751                 if (fsverity_verify_page(rpage))
1752                         SetPageUptodate(rpage);
1753                 else
1754                         ClearPageUptodate(rpage);
1755                 unlock_page(rpage);
1756         }
1757
1758         f2fs_put_dic(dic, true);
1759 }
1760
1761 /*
1762  * This is called when a compressed cluster has been decompressed
1763  * (or failed to be read and/or decompressed).
1764  */
1765 void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
1766                                 bool in_task)
1767 {
1768         int i;
1769
1770         if (!failed && dic->need_verity) {
1771                 /*
1772                  * Note that to avoid deadlocks, the verity work can't be done
1773                  * on the decompression workqueue.  This is because verifying
1774                  * the data pages can involve reading metadata pages from the
1775                  * file, and these metadata pages may be compressed.
1776                  */
1777                 INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1778                 fsverity_enqueue_verify_work(&dic->verity_work);
1779                 return;
1780         }
1781
1782         /* Update and unlock the cluster's pagecache pages. */
1783         for (i = 0; i < dic->cluster_size; i++) {
1784                 struct page *rpage = dic->rpages[i];
1785
1786                 if (!rpage)
1787                         continue;
1788
1789                 if (failed)
1790                         ClearPageUptodate(rpage);
1791                 else
1792                         SetPageUptodate(rpage);
1793                 unlock_page(rpage);
1794         }
1795
1796         /*
1797          * Release the reference to the decompress_io_ctx that was being held
1798          * for I/O completion.
1799          */
1800         f2fs_put_dic(dic, in_task);
1801 }
1802
1803 /*
1804  * Put a reference to a compressed page's decompress_io_ctx.
1805  *
1806  * This is called when the page is no longer needed and can be freed.
1807  */
1808 void f2fs_put_page_dic(struct page *page, bool in_task)
1809 {
1810         struct decompress_io_ctx *dic =
1811                         (struct decompress_io_ctx *)page_private(page);
1812
1813         f2fs_put_dic(dic, in_task);
1814 }
1815
1816 /*
1817  * check whether cluster blocks are contiguous, and add extent cache entry
1818  * only if cluster blocks are logically and physically contiguous.
1819  */
1820 unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn,
1821                                                 unsigned int ofs_in_node)
1822 {
1823         bool compressed = data_blkaddr(dn->inode, dn->node_page,
1824                                         ofs_in_node) == COMPRESS_ADDR;
1825         int i = compressed ? 1 : 0;
1826         block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page,
1827                                                         ofs_in_node + i);
1828
1829         for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
1830                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
1831                                                         ofs_in_node + i);
1832
1833                 if (!__is_valid_data_blkaddr(blkaddr))
1834                         break;
1835                 if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
1836                         return 0;
1837         }
1838
1839         return compressed ? i - 1 : i;
1840 }
1841
1842 const struct address_space_operations f2fs_compress_aops = {
1843         .release_folio = f2fs_release_folio,
1844         .invalidate_folio = f2fs_invalidate_folio,
1845         .migrate_folio  = filemap_migrate_folio,
1846 };
1847
1848 struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1849 {
1850         return sbi->compress_inode->i_mapping;
1851 }
1852
1853 void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
1854 {
1855         if (!sbi->compress_inode)
1856                 return;
1857         invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr);
1858 }
1859
1860 void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1861                                                 nid_t ino, block_t blkaddr)
1862 {
1863         struct page *cpage;
1864         int ret;
1865
1866         if (!test_opt(sbi, COMPRESS_CACHE))
1867                 return;
1868
1869         if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1870                 return;
1871
1872         if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
1873                 return;
1874
1875         cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
1876         if (cpage) {
1877                 f2fs_put_page(cpage, 0);
1878                 return;
1879         }
1880
1881         cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
1882         if (!cpage)
1883                 return;
1884
1885         ret = add_to_page_cache_lru(cpage, COMPRESS_MAPPING(sbi),
1886                                                 blkaddr, GFP_NOFS);
1887         if (ret) {
1888                 f2fs_put_page(cpage, 0);
1889                 return;
1890         }
1891
1892         set_page_private_data(cpage, ino);
1893
1894         memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
1895         SetPageUptodate(cpage);
1896         f2fs_put_page(cpage, 1);
1897 }
1898
1899 bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1900                                                                 block_t blkaddr)
1901 {
1902         struct page *cpage;
1903         bool hitted = false;
1904
1905         if (!test_opt(sbi, COMPRESS_CACHE))
1906                 return false;
1907
1908         cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
1909                                 blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1910         if (cpage) {
1911                 if (PageUptodate(cpage)) {
1912                         atomic_inc(&sbi->compress_page_hit);
1913                         memcpy(page_address(page),
1914                                 page_address(cpage), PAGE_SIZE);
1915                         hitted = true;
1916                 }
1917                 f2fs_put_page(cpage, 1);
1918         }
1919
1920         return hitted;
1921 }
1922
1923 void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1924 {
1925         struct address_space *mapping = COMPRESS_MAPPING(sbi);
1926         struct folio_batch fbatch;
1927         pgoff_t index = 0;
1928         pgoff_t end = MAX_BLKADDR(sbi);
1929
1930         if (!mapping->nrpages)
1931                 return;
1932
1933         folio_batch_init(&fbatch);
1934
1935         do {
1936                 unsigned int nr, i;
1937
1938                 nr = filemap_get_folios(mapping, &index, end - 1, &fbatch);
1939                 if (!nr)
1940                         break;
1941
1942                 for (i = 0; i < nr; i++) {
1943                         struct folio *folio = fbatch.folios[i];
1944
1945                         folio_lock(folio);
1946                         if (folio->mapping != mapping) {
1947                                 folio_unlock(folio);
1948                                 continue;
1949                         }
1950
1951                         if (ino != get_page_private_data(&folio->page)) {
1952                                 folio_unlock(folio);
1953                                 continue;
1954                         }
1955
1956                         generic_error_remove_folio(mapping, folio);
1957                         folio_unlock(folio);
1958                 }
1959                 folio_batch_release(&fbatch);
1960                 cond_resched();
1961         } while (index < end);
1962 }
1963
1964 int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
1965 {
1966         struct inode *inode;
1967
1968         if (!test_opt(sbi, COMPRESS_CACHE))
1969                 return 0;
1970
1971         inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
1972         if (IS_ERR(inode))
1973                 return PTR_ERR(inode);
1974         sbi->compress_inode = inode;
1975
1976         sbi->compress_percent = COMPRESS_PERCENT;
1977         sbi->compress_watermark = COMPRESS_WATERMARK;
1978
1979         atomic_set(&sbi->compress_page_hit, 0);
1980
1981         return 0;
1982 }
1983
1984 void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
1985 {
1986         if (!sbi->compress_inode)
1987                 return;
1988         iput(sbi->compress_inode);
1989         sbi->compress_inode = NULL;
1990 }
1991
1992 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1993 {
1994         dev_t dev = sbi->sb->s_bdev->bd_dev;
1995         char slab_name[35];
1996
1997         if (!f2fs_sb_has_compression(sbi))
1998                 return 0;
1999
2000         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
2001
2002         sbi->page_array_slab_size = sizeof(struct page *) <<
2003                                         F2FS_OPTION(sbi).compress_log_size;
2004
2005         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
2006                                         sbi->page_array_slab_size);
2007         return sbi->page_array_slab ? 0 : -ENOMEM;
2008 }
2009
2010 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
2011 {
2012         kmem_cache_destroy(sbi->page_array_slab);
2013 }
2014
2015 int __init f2fs_init_compress_cache(void)
2016 {
2017         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
2018                                         sizeof(struct compress_io_ctx));
2019         if (!cic_entry_slab)
2020                 return -ENOMEM;
2021         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
2022                                         sizeof(struct decompress_io_ctx));
2023         if (!dic_entry_slab)
2024                 goto free_cic;
2025         return 0;
2026 free_cic:
2027         kmem_cache_destroy(cic_entry_slab);
2028         return -ENOMEM;
2029 }
2030
2031 void f2fs_destroy_compress_cache(void)
2032 {
2033         kmem_cache_destroy(dic_entry_slab);
2034         kmem_cache_destroy(cic_entry_slab);
2035 }