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 };
  59
  60 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
  61 {
  62         return index & (cc->cluster_size - 1);
  63 }
  64
  65 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
  66 {
  67         return index >> cc->log_cluster_size;
  68 }
  69
  70 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
  71 {
  72         return cc->cluster_idx << cc->log_cluster_size;
  73 }
  74
  75 bool f2fs_is_compressed_page(struct page *page)
  76 {
  77         if (!PagePrivate(page))
  78                 return false;
  79         if (!page_private(page))
  80                 return false;
  81         if (page_private_nonpointer(page))
  82                 return false;
  83
  84         f2fs_bug_on(F2FS_M_SB(page->mapping),
  85                 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
  86         return true;
  87 }
  88
  89 static void f2fs_set_compressed_page(struct page *page,
  90                 struct inode *inode, pgoff_t index, void *data)
  91 {
  92         attach_page_private(page, (void *)data);
  93
  94         /* i_crypto_info and iv index */
  95         page->index = index;
  96         page->mapping = inode->i_mapping;
  97 }
  98
  99 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
 100 {
 101         int i;
 102
 103         for (i = 0; i < len; i++) {
 104                 if (!cc->rpages[i])
 105                         continue;
 106                 if (unlock)
 107                         unlock_page(cc->rpages[i]);
 108                 else
 109                         put_page(cc->rpages[i]);
 110         }
 111 }
 112
 113 static void f2fs_put_rpages(struct compress_ctx *cc)
 114 {
 115         f2fs_drop_rpages(cc, cc->cluster_size, false);
 116 }
 117
 118 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
 119 {
 120         f2fs_drop_rpages(cc, len, true);
 121 }
 122
 123 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 124                 struct writeback_control *wbc, bool redirty, int unlock)
 125 {
 126         unsigned int i;
 127
 128         for (i = 0; i < cc->cluster_size; i++) {
 129                 if (!cc->rpages[i])
 130                         continue;
 131                 if (redirty)
 132                         redirty_page_for_writepage(wbc, cc->rpages[i]);
 133                 f2fs_put_page(cc->rpages[i], unlock);
 134         }
 135 }
 136
 137 struct page *f2fs_compress_control_page(struct page *page)
 138 {
 139         return ((struct compress_io_ctx *)page_private(page))->rpages[0];
 140 }
 141
 142 int f2fs_init_compress_ctx(struct compress_ctx *cc)
 143 {
 144         if (cc->rpages)
 145                 return 0;
 146
 147         cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 148         return cc->rpages ? 0 : -ENOMEM;
 149 }
 150
 151 void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
 152 {
 153         page_array_free(cc->inode, cc->rpages, cc->cluster_size);
 154         cc->rpages = NULL;
 155         cc->nr_rpages = 0;
 156         cc->nr_cpages = 0;
 157         cc->valid_nr_cpages = 0;
 158         if (!reuse)
 159                 cc->cluster_idx = NULL_CLUSTER;
 160 }
 161
 162 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 163 {
 164         unsigned int cluster_ofs;
 165
 166         if (!f2fs_cluster_can_merge_page(cc, page->index))
 167                 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 168
 169         cluster_ofs = offset_in_cluster(cc, page->index);
 170         cc->rpages[cluster_ofs] = page;
 171         cc->nr_rpages++;
 172         cc->cluster_idx = cluster_idx(cc, page->index);
 173 }
 174
 175 #ifdef CONFIG_F2FS_FS_LZO
 176 static int lzo_init_compress_ctx(struct compress_ctx *cc)
 177 {
 178         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 179                                 LZO1X_MEM_COMPRESS, GFP_NOFS);
 180         if (!cc->private)
 181                 return -ENOMEM;
 182
 183         cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 184         return 0;
 185 }
 186
 187 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 188 {
 189         kvfree(cc->private);
 190         cc->private = NULL;
 191 }
 192
 193 static int lzo_compress_pages(struct compress_ctx *cc)
 194 {
 195         int ret;
 196
 197         ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 198                                         &cc->clen, cc->private);
 199         if (ret != LZO_E_OK) {
 200                 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
 201                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 202                 return -EIO;
 203         }
 204         return 0;
 205 }
 206
 207 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 208 {
 209         int ret;
 210
 211         ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 212                                                 dic->rbuf, &dic->rlen);
 213         if (ret != LZO_E_OK) {
 214                 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
 215                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 216                 return -EIO;
 217         }
 218
 219         if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 220                 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
 221                                         "expected:%lu\n", KERN_ERR,
 222                                         F2FS_I_SB(dic->inode)->sb->s_id,
 223                                         dic->rlen,
 224                                         PAGE_SIZE << dic->log_cluster_size);
 225                 return -EIO;
 226         }
 227         return 0;
 228 }
 229
 230 static const struct f2fs_compress_ops f2fs_lzo_ops = {
 231         .init_compress_ctx      = lzo_init_compress_ctx,
 232         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 233         .compress_pages         = lzo_compress_pages,
 234         .decompress_pages       = lzo_decompress_pages,
 235 };
 236 #endif
 237
 238 #ifdef CONFIG_F2FS_FS_LZ4
 239 static int lz4_init_compress_ctx(struct compress_ctx *cc)
 240 {
 241         unsigned int size = LZ4_MEM_COMPRESS;
 242
 243 #ifdef CONFIG_F2FS_FS_LZ4HC
 244         if (F2FS_I(cc->inode)->i_compress_level)
 245                 size = LZ4HC_MEM_COMPRESS;
 246 #endif
 247
 248         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
 249         if (!cc->private)
 250                 return -ENOMEM;
 251
 252         /*
 253          * we do not change cc->clen to LZ4_compressBound(inputsize) to
 254          * adapt worst compress case, because lz4 compressor can handle
 255          * output budget properly.
 256          */
 257         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 258         return 0;
 259 }
 260
 261 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 262 {
 263         kvfree(cc->private);
 264         cc->private = NULL;
 265 }
 266
 267 static int lz4_compress_pages(struct compress_ctx *cc)
 268 {
 269         int len = -EINVAL;
 270         unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 271
 272         if (!level)
 273                 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 274                                                 cc->clen, cc->private);
 275 #ifdef CONFIG_F2FS_FS_LZ4HC
 276         else
 277                 len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 278                                         cc->clen, level, cc->private);
 279 #endif
 280         if (len < 0)
 281                 return len;
 282         if (!len)
 283                 return -EAGAIN;
 284
 285         cc->clen = len;
 286         return 0;
 287 }
 288
 289 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 290 {
 291         int ret;
 292
 293         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 294                                                 dic->clen, dic->rlen);
 295         if (ret < 0) {
 296                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 297                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 298                 return -EIO;
 299         }
 300
 301         if (ret != PAGE_SIZE << dic->log_cluster_size) {
 302                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
 303                                         "expected:%lu\n", KERN_ERR,
 304                                         F2FS_I_SB(dic->inode)->sb->s_id, ret,
 305                                         PAGE_SIZE << dic->log_cluster_size);
 306                 return -EIO;
 307         }
 308         return 0;
 309 }
 310
 311 static const struct f2fs_compress_ops f2fs_lz4_ops = {
 312         .init_compress_ctx      = lz4_init_compress_ctx,
 313         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 314         .compress_pages         = lz4_compress_pages,
 315         .decompress_pages       = lz4_decompress_pages,
 316 };
 317 #endif
 318
 319 #ifdef CONFIG_F2FS_FS_ZSTD
 320 #define F2FS_ZSTD_DEFAULT_CLEVEL        1
 321
 322 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 323 {
 324         zstd_parameters params;
 325         zstd_cstream *stream;
 326         void *workspace;
 327         unsigned int workspace_size;
 328         unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 329
 330         if (!level)
 331                 level = F2FS_ZSTD_DEFAULT_CLEVEL;
 332
 333         params = zstd_get_params(level, cc->rlen);
 334         workspace_size = zstd_cstream_workspace_bound(&params.cParams);
 335
 336         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 337                                         workspace_size, GFP_NOFS);
 338         if (!workspace)
 339                 return -ENOMEM;
 340
 341         stream = zstd_init_cstream(&params, 0, workspace, workspace_size);
 342         if (!stream) {
 343                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n",
 344                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 345                                 __func__);
 346                 kvfree(workspace);
 347                 return -EIO;
 348         }
 349
 350         cc->private = workspace;
 351         cc->private2 = stream;
 352
 353         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 354         return 0;
 355 }
 356
 357 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 358 {
 359         kvfree(cc->private);
 360         cc->private = NULL;
 361         cc->private2 = NULL;
 362 }
 363
 364 static int zstd_compress_pages(struct compress_ctx *cc)
 365 {
 366         zstd_cstream *stream = cc->private2;
 367         zstd_in_buffer inbuf;
 368         zstd_out_buffer outbuf;
 369         int src_size = cc->rlen;
 370         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 371         int ret;
 372
 373         inbuf.pos = 0;
 374         inbuf.src = cc->rbuf;
 375         inbuf.size = src_size;
 376
 377         outbuf.pos = 0;
 378         outbuf.dst = cc->cbuf->cdata;
 379         outbuf.size = dst_size;
 380
 381         ret = zstd_compress_stream(stream, &outbuf, &inbuf);
 382         if (zstd_is_error(ret)) {
 383                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n",
 384                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 385                                 __func__, zstd_get_error_code(ret));
 386                 return -EIO;
 387         }
 388
 389         ret = zstd_end_stream(stream, &outbuf);
 390         if (zstd_is_error(ret)) {
 391                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n",
 392                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 393                                 __func__, zstd_get_error_code(ret));
 394                 return -EIO;
 395         }
 396
 397         /*
 398          * there is compressed data remained in intermediate buffer due to
 399          * no more space in cbuf.cdata
 400          */
 401         if (ret)
 402                 return -EAGAIN;
 403
 404         cc->clen = outbuf.pos;
 405         return 0;
 406 }
 407
 408 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 409 {
 410         zstd_dstream *stream;
 411         void *workspace;
 412         unsigned int workspace_size;
 413         unsigned int max_window_size =
 414                         MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 415
 416         workspace_size = zstd_dstream_workspace_bound(max_window_size);
 417
 418         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 419                                         workspace_size, GFP_NOFS);
 420         if (!workspace)
 421                 return -ENOMEM;
 422
 423         stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
 424         if (!stream) {
 425                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n",
 426                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 427                                 __func__);
 428                 kvfree(workspace);
 429                 return -EIO;
 430         }
 431
 432         dic->private = workspace;
 433         dic->private2 = stream;
 434
 435         return 0;
 436 }
 437
 438 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 439 {
 440         kvfree(dic->private);
 441         dic->private = NULL;
 442         dic->private2 = NULL;
 443 }
 444
 445 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 446 {
 447         zstd_dstream *stream = dic->private2;
 448         zstd_in_buffer inbuf;
 449         zstd_out_buffer outbuf;
 450         int ret;
 451
 452         inbuf.pos = 0;
 453         inbuf.src = dic->cbuf->cdata;
 454         inbuf.size = dic->clen;
 455
 456         outbuf.pos = 0;
 457         outbuf.dst = dic->rbuf;
 458         outbuf.size = dic->rlen;
 459
 460         ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
 461         if (zstd_is_error(ret)) {
 462                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n",
 463                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 464                                 __func__, zstd_get_error_code(ret));
 465                 return -EIO;
 466         }
 467
 468         if (dic->rlen != outbuf.pos) {
 469                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 470                                 "expected:%lu\n", KERN_ERR,
 471                                 F2FS_I_SB(dic->inode)->sb->s_id,
 472                                 __func__, dic->rlen,
 473                                 PAGE_SIZE << dic->log_cluster_size);
 474                 return -EIO;
 475         }
 476
 477         return 0;
 478 }
 479
 480 static const struct f2fs_compress_ops f2fs_zstd_ops = {
 481         .init_compress_ctx      = zstd_init_compress_ctx,
 482         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 483         .compress_pages         = zstd_compress_pages,
 484         .init_decompress_ctx    = zstd_init_decompress_ctx,
 485         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 486         .decompress_pages       = zstd_decompress_pages,
 487 };
 488 #endif
 489
 490 #ifdef CONFIG_F2FS_FS_LZO
 491 #ifdef CONFIG_F2FS_FS_LZORLE
 492 static int lzorle_compress_pages(struct compress_ctx *cc)
 493 {
 494         int ret;
 495
 496         ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 497                                         &cc->clen, cc->private);
 498         if (ret != LZO_E_OK) {
 499                 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
 500                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 501                 return -EIO;
 502         }
 503         return 0;
 504 }
 505
 506 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 507         .init_compress_ctx      = lzo_init_compress_ctx,
 508         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 509         .compress_pages         = lzorle_compress_pages,
 510         .decompress_pages       = lzo_decompress_pages,
 511 };
 512 #endif
 513 #endif
 514
 515 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 516 #ifdef CONFIG_F2FS_FS_LZO
 517         &f2fs_lzo_ops,
 518 #else
 519         NULL,
 520 #endif
 521 #ifdef CONFIG_F2FS_FS_LZ4
 522         &f2fs_lz4_ops,
 523 #else
 524         NULL,
 525 #endif
 526 #ifdef CONFIG_F2FS_FS_ZSTD
 527         &f2fs_zstd_ops,
 528 #else
 529         NULL,
 530 #endif
 531 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 532         &f2fs_lzorle_ops,
 533 #else
 534         NULL,
 535 #endif
 536 };
 537
 538 bool f2fs_is_compress_backend_ready(struct inode *inode)
 539 {
 540         if (!f2fs_compressed_file(inode))
 541                 return true;
 542         return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 543 }
 544
 545 static mempool_t *compress_page_pool;
 546 static int num_compress_pages = 512;
 547 module_param(num_compress_pages, uint, 0444);
 548 MODULE_PARM_DESC(num_compress_pages,
 549                 "Number of intermediate compress pages to preallocate");
 550
 551 int __init f2fs_init_compress_mempool(void)
 552 {
 553         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 554         return compress_page_pool ? 0 : -ENOMEM;
 555 }
 556
 557 void f2fs_destroy_compress_mempool(void)
 558 {
 559         mempool_destroy(compress_page_pool);
 560 }
 561
 562 static struct page *f2fs_compress_alloc_page(void)
 563 {
 564         struct page *page;
 565
 566         page = mempool_alloc(compress_page_pool, GFP_NOFS);
 567         lock_page(page);
 568
 569         return page;
 570 }
 571
 572 static void f2fs_compress_free_page(struct page *page)
 573 {
 574         if (!page)
 575                 return;
 576         detach_page_private(page);
 577         page->mapping = NULL;
 578         unlock_page(page);
 579         mempool_free(page, compress_page_pool);
 580 }
 581
 582 #define MAX_VMAP_RETRIES        3
 583
 584 static void *f2fs_vmap(struct page **pages, unsigned int count)
 585 {
 586         int i;
 587         void *buf = NULL;
 588
 589         for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 590                 buf = vm_map_ram(pages, count, -1);
 591                 if (buf)
 592                         break;
 593                 vm_unmap_aliases();
 594         }
 595         return buf;
 596 }
 597
 598 static int f2fs_compress_pages(struct compress_ctx *cc)
 599 {
 600         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 601         const struct f2fs_compress_ops *cops =
 602                                 f2fs_cops[fi->i_compress_algorithm];
 603         unsigned int max_len, new_nr_cpages;
 604         u32 chksum = 0;
 605         int i, ret;
 606
 607         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 608                                 cc->cluster_size, fi->i_compress_algorithm);
 609
 610         if (cops->init_compress_ctx) {
 611                 ret = cops->init_compress_ctx(cc);
 612                 if (ret)
 613                         goto out;
 614         }
 615
 616         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 617         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 618         cc->valid_nr_cpages = cc->nr_cpages;
 619
 620         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 621         if (!cc->cpages) {
 622                 ret = -ENOMEM;
 623                 goto destroy_compress_ctx;
 624         }
 625
 626         for (i = 0; i < cc->nr_cpages; i++) {
 627                 cc->cpages[i] = f2fs_compress_alloc_page();
 628                 if (!cc->cpages[i]) {
 629                         ret = -ENOMEM;
 630                         goto out_free_cpages;
 631                 }
 632         }
 633
 634         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 635         if (!cc->rbuf) {
 636                 ret = -ENOMEM;
 637                 goto out_free_cpages;
 638         }
 639
 640         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 641         if (!cc->cbuf) {
 642                 ret = -ENOMEM;
 643                 goto out_vunmap_rbuf;
 644         }
 645
 646         ret = cops->compress_pages(cc);
 647         if (ret)
 648                 goto out_vunmap_cbuf;
 649
 650         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 651
 652         if (cc->clen > max_len) {
 653                 ret = -EAGAIN;
 654                 goto out_vunmap_cbuf;
 655         }
 656
 657         cc->cbuf->clen = cpu_to_le32(cc->clen);
 658
 659         if (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))
 660                 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
 661                                         cc->cbuf->cdata, cc->clen);
 662         cc->cbuf->chksum = cpu_to_le32(chksum);
 663
 664         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 665                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 666
 667         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 668
 669         /* zero out any unused part of the last page */
 670         memset(&cc->cbuf->cdata[cc->clen], 0,
 671                         (new_nr_cpages * PAGE_SIZE) -
 672                         (cc->clen + COMPRESS_HEADER_SIZE));
 673
 674         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 675         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 676
 677         for (i = new_nr_cpages; i < cc->nr_cpages; i++) {
 678                 f2fs_compress_free_page(cc->cpages[i]);
 679                 cc->cpages[i] = NULL;
 680         }
 681
 682         if (cops->destroy_compress_ctx)
 683                 cops->destroy_compress_ctx(cc);
 684
 685         cc->valid_nr_cpages = new_nr_cpages;
 686
 687         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 688                                                         cc->clen, ret);
 689         return 0;
 690
 691 out_vunmap_cbuf:
 692         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 693 out_vunmap_rbuf:
 694         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 695 out_free_cpages:
 696         for (i = 0; i < cc->nr_cpages; i++) {
 697                 if (cc->cpages[i])
 698                         f2fs_compress_free_page(cc->cpages[i]);
 699         }
 700         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 701         cc->cpages = NULL;
 702 destroy_compress_ctx:
 703         if (cops->destroy_compress_ctx)
 704                 cops->destroy_compress_ctx(cc);
 705 out:
 706         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 707                                                         cc->clen, ret);
 708         return ret;
 709 }
 710
 711 static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
 712                 bool pre_alloc);
 713 static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
 714                 bool bypass_destroy_callback, bool pre_alloc);
 715
 716 void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
 717 {
 718         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 719         struct f2fs_inode_info *fi = F2FS_I(dic->inode);
 720         const struct f2fs_compress_ops *cops =
 721                         f2fs_cops[fi->i_compress_algorithm];
 722         bool bypass_callback = false;
 723         int ret;
 724
 725         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 726                                 dic->cluster_size, fi->i_compress_algorithm);
 727
 728         if (dic->failed) {
 729                 ret = -EIO;
 730                 goto out_end_io;
 731         }
 732
 733         ret = f2fs_prepare_decomp_mem(dic, false);
 734         if (ret) {
 735                 bypass_callback = true;
 736                 goto out_release;
 737         }
 738
 739         dic->clen = le32_to_cpu(dic->cbuf->clen);
 740         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 741
 742         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 743                 ret = -EFSCORRUPTED;
 744
 745                 /* Avoid f2fs_commit_super in irq context */
 746                 if (in_task)
 747                         f2fs_save_errors(sbi, ERROR_FAIL_DECOMPRESSION);
 748                 else
 749                         f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
 750                 goto out_release;
 751         }
 752
 753         ret = cops->decompress_pages(dic);
 754
 755         if (!ret && (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))) {
 756                 u32 provided = le32_to_cpu(dic->cbuf->chksum);
 757                 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
 758
 759                 if (provided != calculated) {
 760                         if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 761                                 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 762                                 printk_ratelimited(
 763                                         "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
 764                                         KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
 765                                         provided, calculated);
 766                         }
 767                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 768                 }
 769         }
 770
 771 out_release:
 772         f2fs_release_decomp_mem(dic, bypass_callback, false);
 773
 774 out_end_io:
 775         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 776                                                         dic->clen, ret);
 777         f2fs_decompress_end_io(dic, ret, in_task);
 778 }
 779
 780 /*
 781  * This is called when a page of a compressed cluster has been read from disk
 782  * (or failed to be read from disk).  It checks whether this page was the last
 783  * page being waited on in the cluster, and if so, it decompresses the cluster
 784  * (or in the case of a failure, cleans up without actually decompressing).
 785  */
 786 void f2fs_end_read_compressed_page(struct page *page, bool failed,
 787                 block_t blkaddr, bool in_task)
 788 {
 789         struct decompress_io_ctx *dic =
 790                         (struct decompress_io_ctx *)page_private(page);
 791         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 792
 793         dec_page_count(sbi, F2FS_RD_DATA);
 794
 795         if (failed)
 796                 WRITE_ONCE(dic->failed, true);
 797         else if (blkaddr && in_task)
 798                 f2fs_cache_compressed_page(sbi, page,
 799                                         dic->inode->i_ino, blkaddr);
 800
 801         if (atomic_dec_and_test(&dic->remaining_pages))
 802                 f2fs_decompress_cluster(dic, in_task);
 803 }
 804
 805 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 806 {
 807         if (cc->cluster_idx == NULL_CLUSTER)
 808                 return true;
 809         return cc->cluster_idx == cluster_idx(cc, index);
 810 }
 811
 812 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 813 {
 814         return cc->nr_rpages == 0;
 815 }
 816
 817 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 818 {
 819         return cc->cluster_size == cc->nr_rpages;
 820 }
 821
 822 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 823 {
 824         if (f2fs_cluster_is_empty(cc))
 825                 return true;
 826         return is_page_in_cluster(cc, index);
 827 }
 828
 829 bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
 830                                 int index, int nr_pages, bool uptodate)
 831 {
 832         unsigned long pgidx = pages[index]->index;
 833         int i = uptodate ? 0 : 1;
 834
 835         /*
 836          * when uptodate set to true, try to check all pages in cluster is
 837          * uptodate or not.
 838          */
 839         if (uptodate && (pgidx % cc->cluster_size))
 840                 return false;
 841
 842         if (nr_pages - index < cc->cluster_size)
 843                 return false;
 844
 845         for (; i < cc->cluster_size; i++) {
 846                 if (pages[index + i]->index != pgidx + i)
 847                         return false;
 848                 if (uptodate && !PageUptodate(pages[index + i]))
 849                         return false;
 850         }
 851
 852         return true;
 853 }
 854
 855 static bool cluster_has_invalid_data(struct compress_ctx *cc)
 856 {
 857         loff_t i_size = i_size_read(cc->inode);
 858         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 859         int i;
 860
 861         for (i = 0; i < cc->cluster_size; i++) {
 862                 struct page *page = cc->rpages[i];
 863
 864                 f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
 865
 866                 /* beyond EOF */
 867                 if (page->index >= nr_pages)
 868                         return true;
 869         }
 870         return false;
 871 }
 872
 873 bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
 874 {
 875         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 876         unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
 877         bool compressed = dn->data_blkaddr == COMPRESS_ADDR;
 878         int cluster_end = 0;
 879         int i;
 880         char *reason = "";
 881
 882         if (!compressed)
 883                 return false;
 884
 885         /* [..., COMPR_ADDR, ...] */
 886         if (dn->ofs_in_node % cluster_size) {
 887                 reason = "[*|C|*|*]";
 888                 goto out;
 889         }
 890
 891         for (i = 1; i < cluster_size; i++) {
 892                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
 893                                                         dn->ofs_in_node + i);
 894
 895                 /* [COMPR_ADDR, ..., COMPR_ADDR] */
 896                 if (blkaddr == COMPRESS_ADDR) {
 897                         reason = "[C|*|C|*]";
 898                         goto out;
 899                 }
 900                 if (!__is_valid_data_blkaddr(blkaddr)) {
 901                         if (!cluster_end)
 902                                 cluster_end = i;
 903                         continue;
 904                 }
 905                 /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
 906                 if (cluster_end) {
 907                         reason = "[C|N|N|V]";
 908                         goto out;
 909                 }
 910         }
 911         return false;
 912 out:
 913         f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
 914                         dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
 915         set_sbi_flag(sbi, SBI_NEED_FSCK);
 916         return true;
 917 }
 918
 919 static int __f2fs_cluster_blocks(struct inode *inode,
 920                                 unsigned int cluster_idx, bool compr)
 921 {
 922         struct dnode_of_data dn;
 923         unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
 924         unsigned int start_idx = cluster_idx <<
 925                                 F2FS_I(inode)->i_log_cluster_size;
 926         int ret;
 927
 928         set_new_dnode(&dn, inode, NULL, NULL, 0);
 929         ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
 930         if (ret) {
 931                 if (ret == -ENOENT)
 932                         ret = 0;
 933                 goto fail;
 934         }
 935
 936         if (f2fs_sanity_check_cluster(&dn)) {
 937                 ret = -EFSCORRUPTED;
 938                 f2fs_handle_error(F2FS_I_SB(inode), ERROR_CORRUPTED_CLUSTER);
 939                 goto fail;
 940         }
 941
 942         if (dn.data_blkaddr == COMPRESS_ADDR) {
 943                 int i;
 944
 945                 ret = 1;
 946                 for (i = 1; i < cluster_size; i++) {
 947                         block_t blkaddr;
 948
 949                         blkaddr = data_blkaddr(dn.inode,
 950                                         dn.node_page, dn.ofs_in_node + i);
 951                         if (compr) {
 952                                 if (__is_valid_data_blkaddr(blkaddr))
 953                                         ret++;
 954                         } else {
 955                                 if (blkaddr != NULL_ADDR)
 956                                         ret++;
 957                         }
 958                 }
 959
 960                 f2fs_bug_on(F2FS_I_SB(inode),
 961                         !compr && ret != cluster_size &&
 962                         !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
 963         }
 964 fail:
 965         f2fs_put_dnode(&dn);
 966         return ret;
 967 }
 968
 969 /* return # of compressed blocks in compressed cluster */
 970 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 971 {
 972         return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
 973 }
 974
 975 /* return # of valid blocks in compressed cluster */
 976 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 977 {
 978         return __f2fs_cluster_blocks(inode,
 979                 index >> F2FS_I(inode)->i_log_cluster_size,
 980                 false);
 981 }
 982
 983 static bool cluster_may_compress(struct compress_ctx *cc)
 984 {
 985         if (!f2fs_need_compress_data(cc->inode))
 986                 return false;
 987         if (f2fs_is_atomic_file(cc->inode))
 988                 return false;
 989         if (!f2fs_cluster_is_full(cc))
 990                 return false;
 991         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
 992                 return false;
 993         return !cluster_has_invalid_data(cc);
 994 }
 995
 996 static void set_cluster_writeback(struct compress_ctx *cc)
 997 {
 998         int i;
 999
1000         for (i = 0; i < cc->cluster_size; i++) {
1001                 if (cc->rpages[i])
1002                         set_page_writeback(cc->rpages[i]);
1003         }
1004 }
1005
1006 static void set_cluster_dirty(struct compress_ctx *cc)
1007 {
1008         int i;
1009
1010         for (i = 0; i < cc->cluster_size; i++)
1011                 if (cc->rpages[i])
1012                         set_page_dirty(cc->rpages[i]);
1013 }
1014
1015 static int prepare_compress_overwrite(struct compress_ctx *cc,
1016                 struct page **pagep, pgoff_t index, void **fsdata)
1017 {
1018         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1019         struct address_space *mapping = cc->inode->i_mapping;
1020         struct page *page;
1021         sector_t last_block_in_bio;
1022         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1023         pgoff_t start_idx = start_idx_of_cluster(cc);
1024         int i, ret;
1025
1026 retry:
1027         ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
1028         if (ret <= 0)
1029                 return ret;
1030
1031         ret = f2fs_init_compress_ctx(cc);
1032         if (ret)
1033                 return ret;
1034
1035         /* keep page reference to avoid page reclaim */
1036         for (i = 0; i < cc->cluster_size; i++) {
1037                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1038                                                         fgp_flag, GFP_NOFS);
1039                 if (!page) {
1040                         ret = -ENOMEM;
1041                         goto unlock_pages;
1042                 }
1043
1044                 if (PageUptodate(page))
1045                         f2fs_put_page(page, 1);
1046                 else
1047                         f2fs_compress_ctx_add_page(cc, page);
1048         }
1049
1050         if (!f2fs_cluster_is_empty(cc)) {
1051                 struct bio *bio = NULL;
1052
1053                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1054                                         &last_block_in_bio, false, true);
1055                 f2fs_put_rpages(cc);
1056                 f2fs_destroy_compress_ctx(cc, true);
1057                 if (ret)
1058                         goto out;
1059                 if (bio)
1060                         f2fs_submit_read_bio(sbi, bio, DATA);
1061
1062                 ret = f2fs_init_compress_ctx(cc);
1063                 if (ret)
1064                         goto out;
1065         }
1066
1067         for (i = 0; i < cc->cluster_size; i++) {
1068                 f2fs_bug_on(sbi, cc->rpages[i]);
1069
1070                 page = find_lock_page(mapping, start_idx + i);
1071                 if (!page) {
1072                         /* page can be truncated */
1073                         goto release_and_retry;
1074                 }
1075
1076                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1077                 f2fs_compress_ctx_add_page(cc, page);
1078
1079                 if (!PageUptodate(page)) {
1080 release_and_retry:
1081                         f2fs_put_rpages(cc);
1082                         f2fs_unlock_rpages(cc, i + 1);
1083                         f2fs_destroy_compress_ctx(cc, true);
1084                         goto retry;
1085                 }
1086         }
1087
1088         if (likely(!ret)) {
1089                 *fsdata = cc->rpages;
1090                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1091                 return cc->cluster_size;
1092         }
1093
1094 unlock_pages:
1095         f2fs_put_rpages(cc);
1096         f2fs_unlock_rpages(cc, i);
1097         f2fs_destroy_compress_ctx(cc, true);
1098 out:
1099         return ret;
1100 }
1101
1102 int f2fs_prepare_compress_overwrite(struct inode *inode,
1103                 struct page **pagep, pgoff_t index, void **fsdata)
1104 {
1105         struct compress_ctx cc = {
1106                 .inode = inode,
1107                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1108                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1109                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1110                 .rpages = NULL,
1111                 .nr_rpages = 0,
1112         };
1113
1114         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1115 }
1116
1117 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1118                                         pgoff_t index, unsigned copied)
1119
1120 {
1121         struct compress_ctx cc = {
1122                 .inode = inode,
1123                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1124                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1125                 .rpages = fsdata,
1126         };
1127         bool first_index = (index == cc.rpages[0]->index);
1128
1129         if (copied)
1130                 set_cluster_dirty(&cc);
1131
1132         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1133         f2fs_destroy_compress_ctx(&cc, false);
1134
1135         return first_index;
1136 }
1137
1138 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1139 {
1140         void *fsdata = NULL;
1141         struct page *pagep;
1142         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1143         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1144                                                         log_cluster_size;
1145         int err;
1146
1147         err = f2fs_is_compressed_cluster(inode, start_idx);
1148         if (err < 0)
1149                 return err;
1150
1151         /* truncate normal cluster */
1152         if (!err)
1153                 return f2fs_do_truncate_blocks(inode, from, lock);
1154
1155         /* truncate compressed cluster */
1156         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1157                                                 start_idx, &fsdata);
1158
1159         /* should not be a normal cluster */
1160         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1161
1162         if (err <= 0)
1163                 return err;
1164
1165         if (err > 0) {
1166                 struct page **rpages = fsdata;
1167                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1168                 int i;
1169
1170                 for (i = cluster_size - 1; i >= 0; i--) {
1171                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1172
1173                         if (from <= start) {
1174                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1175                         } else {
1176                                 zero_user_segment(rpages[i], from - start,
1177                                                                 PAGE_SIZE);
1178                                 break;
1179                         }
1180                 }
1181
1182                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1183         }
1184         return 0;
1185 }
1186
1187 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1188                                         int *submitted,
1189                                         struct writeback_control *wbc,
1190                                         enum iostat_type io_type)
1191 {
1192         struct inode *inode = cc->inode;
1193         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1194         struct f2fs_inode_info *fi = F2FS_I(inode);
1195         struct f2fs_io_info fio = {
1196                 .sbi = sbi,
1197                 .ino = cc->inode->i_ino,
1198                 .type = DATA,
1199                 .op = REQ_OP_WRITE,
1200                 .op_flags = wbc_to_write_flags(wbc),
1201                 .old_blkaddr = NEW_ADDR,
1202                 .page = NULL,
1203                 .encrypted_page = NULL,
1204                 .compressed_page = NULL,
1205                 .submitted = 0,
1206                 .io_type = io_type,
1207                 .io_wbc = wbc,
1208                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode) ?
1209                                                                         1 : 0,
1210         };
1211         struct dnode_of_data dn;
1212         struct node_info ni;
1213         struct compress_io_ctx *cic;
1214         pgoff_t start_idx = start_idx_of_cluster(cc);
1215         unsigned int last_index = cc->cluster_size - 1;
1216         loff_t psize;
1217         int i, err;
1218
1219         /* we should bypass data pages to proceed the kworker jobs */
1220         if (unlikely(f2fs_cp_error(sbi))) {
1221                 mapping_set_error(cc->rpages[0]->mapping, -EIO);
1222                 goto out_free;
1223         }
1224
1225         if (IS_NOQUOTA(inode)) {
1226                 /*
1227                  * We need to wait for node_write to avoid block allocation during
1228                  * checkpoint. This can only happen to quota writes which can cause
1229                  * the below discard race condition.
1230                  */
1231                 f2fs_down_read(&sbi->node_write);
1232         } else if (!f2fs_trylock_op(sbi)) {
1233                 goto out_free;
1234         }
1235
1236         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1237
1238         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1239         if (err)
1240                 goto out_unlock_op;
1241
1242         for (i = 0; i < cc->cluster_size; i++) {
1243                 if (data_blkaddr(dn.inode, dn.node_page,
1244                                         dn.ofs_in_node + i) == NULL_ADDR)
1245                         goto out_put_dnode;
1246         }
1247
1248         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1249
1250         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
1251         if (err)
1252                 goto out_put_dnode;
1253
1254         fio.version = ni.version;
1255
1256         cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1257         if (!cic)
1258                 goto out_put_dnode;
1259
1260         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1261         cic->inode = inode;
1262         atomic_set(&cic->pending_pages, cc->valid_nr_cpages);
1263         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1264         if (!cic->rpages)
1265                 goto out_put_cic;
1266
1267         cic->nr_rpages = cc->cluster_size;
1268
1269         for (i = 0; i < cc->valid_nr_cpages; i++) {
1270                 f2fs_set_compressed_page(cc->cpages[i], inode,
1271                                         cc->rpages[i + 1]->index, cic);
1272                 fio.compressed_page = cc->cpages[i];
1273
1274                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1275                                                 dn.ofs_in_node + i + 1);
1276
1277                 /* wait for GCed page writeback via META_MAPPING */
1278                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1279
1280                 if (fio.encrypted) {
1281                         fio.page = cc->rpages[i + 1];
1282                         err = f2fs_encrypt_one_page(&fio);
1283                         if (err)
1284                                 goto out_destroy_crypt;
1285                         cc->cpages[i] = fio.encrypted_page;
1286                 }
1287         }
1288
1289         set_cluster_writeback(cc);
1290
1291         for (i = 0; i < cc->cluster_size; i++)
1292                 cic->rpages[i] = cc->rpages[i];
1293
1294         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1295                 block_t blkaddr;
1296
1297                 blkaddr = f2fs_data_blkaddr(&dn);
1298                 fio.page = cc->rpages[i];
1299                 fio.old_blkaddr = blkaddr;
1300
1301                 /* cluster header */
1302                 if (i == 0) {
1303                         if (blkaddr == COMPRESS_ADDR)
1304                                 fio.compr_blocks++;
1305                         if (__is_valid_data_blkaddr(blkaddr))
1306                                 f2fs_invalidate_blocks(sbi, blkaddr);
1307                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1308                         goto unlock_continue;
1309                 }
1310
1311                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1312                         fio.compr_blocks++;
1313
1314                 if (i > cc->valid_nr_cpages) {
1315                         if (__is_valid_data_blkaddr(blkaddr)) {
1316                                 f2fs_invalidate_blocks(sbi, blkaddr);
1317                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1318                         }
1319                         goto unlock_continue;
1320                 }
1321
1322                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1323
1324                 if (fio.encrypted)
1325                         fio.encrypted_page = cc->cpages[i - 1];
1326                 else
1327                         fio.compressed_page = cc->cpages[i - 1];
1328
1329                 cc->cpages[i - 1] = NULL;
1330                 f2fs_outplace_write_data(&dn, &fio);
1331                 (*submitted)++;
1332 unlock_continue:
1333                 inode_dec_dirty_pages(cc->inode);
1334                 unlock_page(fio.page);
1335         }
1336
1337         if (fio.compr_blocks)
1338                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1339         f2fs_i_compr_blocks_update(inode, cc->valid_nr_cpages, true);
1340         add_compr_block_stat(inode, cc->valid_nr_cpages);
1341
1342         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1343         if (cc->cluster_idx == 0)
1344                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1345
1346         f2fs_put_dnode(&dn);
1347         if (IS_NOQUOTA(inode))
1348                 f2fs_up_read(&sbi->node_write);
1349         else
1350                 f2fs_unlock_op(sbi);
1351
1352         spin_lock(&fi->i_size_lock);
1353         if (fi->last_disk_size < psize)
1354                 fi->last_disk_size = psize;
1355         spin_unlock(&fi->i_size_lock);
1356
1357         f2fs_put_rpages(cc);
1358         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1359         cc->cpages = NULL;
1360         f2fs_destroy_compress_ctx(cc, false);
1361         return 0;
1362
1363 out_destroy_crypt:
1364         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1365
1366         for (--i; i >= 0; i--)
1367                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1368 out_put_cic:
1369         kmem_cache_free(cic_entry_slab, cic);
1370 out_put_dnode:
1371         f2fs_put_dnode(&dn);
1372 out_unlock_op:
1373         if (IS_NOQUOTA(inode))
1374                 f2fs_up_read(&sbi->node_write);
1375         else
1376                 f2fs_unlock_op(sbi);
1377 out_free:
1378         for (i = 0; i < cc->valid_nr_cpages; i++) {
1379                 f2fs_compress_free_page(cc->cpages[i]);
1380                 cc->cpages[i] = NULL;
1381         }
1382         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1383         cc->cpages = NULL;
1384         return -EAGAIN;
1385 }
1386
1387 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1388 {
1389         struct f2fs_sb_info *sbi = bio->bi_private;
1390         struct compress_io_ctx *cic =
1391                         (struct compress_io_ctx *)page_private(page);
1392         int i;
1393
1394         if (unlikely(bio->bi_status))
1395                 mapping_set_error(cic->inode->i_mapping, -EIO);
1396
1397         f2fs_compress_free_page(page);
1398
1399         dec_page_count(sbi, F2FS_WB_DATA);
1400
1401         if (atomic_dec_return(&cic->pending_pages))
1402                 return;
1403
1404         for (i = 0; i < cic->nr_rpages; i++) {
1405                 WARN_ON(!cic->rpages[i]);
1406                 clear_page_private_gcing(cic->rpages[i]);
1407                 end_page_writeback(cic->rpages[i]);
1408         }
1409
1410         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1411         kmem_cache_free(cic_entry_slab, cic);
1412 }
1413
1414 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1415                                         int *submitted,
1416                                         struct writeback_control *wbc,
1417                                         enum iostat_type io_type)
1418 {
1419         struct address_space *mapping = cc->inode->i_mapping;
1420         int _submitted, compr_blocks, ret, i;
1421
1422         compr_blocks = f2fs_compressed_blocks(cc);
1423
1424         for (i = 0; i < cc->cluster_size; i++) {
1425                 if (!cc->rpages[i])
1426                         continue;
1427
1428                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1429                 unlock_page(cc->rpages[i]);
1430         }
1431
1432         if (compr_blocks < 0)
1433                 return compr_blocks;
1434
1435         for (i = 0; i < cc->cluster_size; i++) {
1436                 if (!cc->rpages[i])
1437                         continue;
1438 retry_write:
1439                 lock_page(cc->rpages[i]);
1440
1441                 if (cc->rpages[i]->mapping != mapping) {
1442 continue_unlock:
1443                         unlock_page(cc->rpages[i]);
1444                         continue;
1445                 }
1446
1447                 if (!PageDirty(cc->rpages[i]))
1448                         goto continue_unlock;
1449
1450                 if (PageWriteback(cc->rpages[i])) {
1451                         if (wbc->sync_mode == WB_SYNC_NONE)
1452                                 goto continue_unlock;
1453                         f2fs_wait_on_page_writeback(cc->rpages[i], DATA, true, true);
1454                 }
1455
1456                 if (!clear_page_dirty_for_io(cc->rpages[i]))
1457                         goto continue_unlock;
1458
1459                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1460                                                 NULL, NULL, wbc, io_type,
1461                                                 compr_blocks, false);
1462                 if (ret) {
1463                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1464                                 unlock_page(cc->rpages[i]);
1465                                 ret = 0;
1466                         } else if (ret == -EAGAIN) {
1467                                 /*
1468                                  * for quota file, just redirty left pages to
1469                                  * avoid deadlock caused by cluster update race
1470                                  * from foreground operation.
1471                                  */
1472                                 if (IS_NOQUOTA(cc->inode))
1473                                         return 0;
1474                                 ret = 0;
1475                                 f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
1476                                 goto retry_write;
1477                         }
1478                         return ret;
1479                 }
1480
1481                 *submitted += _submitted;
1482         }
1483
1484         f2fs_balance_fs(F2FS_M_SB(mapping), true);
1485
1486         return 0;
1487 }
1488
1489 int f2fs_write_multi_pages(struct compress_ctx *cc,
1490                                         int *submitted,
1491                                         struct writeback_control *wbc,
1492                                         enum iostat_type io_type)
1493 {
1494         int err;
1495
1496         *submitted = 0;
1497         if (cluster_may_compress(cc)) {
1498                 err = f2fs_compress_pages(cc);
1499                 if (err == -EAGAIN) {
1500                         add_compr_block_stat(cc->inode, cc->cluster_size);
1501                         goto write;
1502                 } else if (err) {
1503                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1504                         goto destroy_out;
1505                 }
1506
1507                 err = f2fs_write_compressed_pages(cc, submitted,
1508                                                         wbc, io_type);
1509                 if (!err)
1510                         return 0;
1511                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1512         }
1513 write:
1514         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1515
1516         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1517         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1518 destroy_out:
1519         f2fs_destroy_compress_ctx(cc, false);
1520         return err;
1521 }
1522
1523 static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
1524                 bool pre_alloc)
1525 {
1526         return pre_alloc ^ f2fs_low_mem_mode(sbi);
1527 }
1528
1529 static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
1530                 bool pre_alloc)
1531 {
1532         const struct f2fs_compress_ops *cops =
1533                 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1534         int i;
1535
1536         if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1537                 return 0;
1538
1539         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
1540         if (!dic->tpages)
1541                 return -ENOMEM;
1542
1543         for (i = 0; i < dic->cluster_size; i++) {
1544                 if (dic->rpages[i]) {
1545                         dic->tpages[i] = dic->rpages[i];
1546                         continue;
1547                 }
1548
1549                 dic->tpages[i] = f2fs_compress_alloc_page();
1550                 if (!dic->tpages[i])
1551                         return -ENOMEM;
1552         }
1553
1554         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
1555         if (!dic->rbuf)
1556                 return -ENOMEM;
1557
1558         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
1559         if (!dic->cbuf)
1560                 return -ENOMEM;
1561
1562         if (cops->init_decompress_ctx)
1563                 return cops->init_decompress_ctx(dic);
1564
1565         return 0;
1566 }
1567
1568 static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
1569                 bool bypass_destroy_callback, bool pre_alloc)
1570 {
1571         const struct f2fs_compress_ops *cops =
1572                 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1573
1574         if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1575                 return;
1576
1577         if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
1578                 cops->destroy_decompress_ctx(dic);
1579
1580         if (dic->cbuf)
1581                 vm_unmap_ram(dic->cbuf, dic->nr_cpages);
1582
1583         if (dic->rbuf)
1584                 vm_unmap_ram(dic->rbuf, dic->cluster_size);
1585 }
1586
1587 static void f2fs_free_dic(struct decompress_io_ctx *dic,
1588                 bool bypass_destroy_callback);
1589
1590 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1591 {
1592         struct decompress_io_ctx *dic;
1593         pgoff_t start_idx = start_idx_of_cluster(cc);
1594         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1595         int i, ret;
1596
1597         dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1598         if (!dic)
1599                 return ERR_PTR(-ENOMEM);
1600
1601         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1602         if (!dic->rpages) {
1603                 kmem_cache_free(dic_entry_slab, dic);
1604                 return ERR_PTR(-ENOMEM);
1605         }
1606
1607         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1608         dic->inode = cc->inode;
1609         atomic_set(&dic->remaining_pages, cc->nr_cpages);
1610         dic->cluster_idx = cc->cluster_idx;
1611         dic->cluster_size = cc->cluster_size;
1612         dic->log_cluster_size = cc->log_cluster_size;
1613         dic->nr_cpages = cc->nr_cpages;
1614         refcount_set(&dic->refcnt, 1);
1615         dic->failed = false;
1616         dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1617
1618         for (i = 0; i < dic->cluster_size; i++)
1619                 dic->rpages[i] = cc->rpages[i];
1620         dic->nr_rpages = cc->cluster_size;
1621
1622         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1623         if (!dic->cpages) {
1624                 ret = -ENOMEM;
1625                 goto out_free;
1626         }
1627
1628         for (i = 0; i < dic->nr_cpages; i++) {
1629                 struct page *page;
1630
1631                 page = f2fs_compress_alloc_page();
1632                 if (!page) {
1633                         ret = -ENOMEM;
1634                         goto out_free;
1635                 }
1636
1637                 f2fs_set_compressed_page(page, cc->inode,
1638                                         start_idx + i + 1, dic);
1639                 dic->cpages[i] = page;
1640         }
1641
1642         ret = f2fs_prepare_decomp_mem(dic, true);
1643         if (ret)
1644                 goto out_free;
1645
1646         return dic;
1647
1648 out_free:
1649         f2fs_free_dic(dic, true);
1650         return ERR_PTR(ret);
1651 }
1652
1653 static void f2fs_free_dic(struct decompress_io_ctx *dic,
1654                 bool bypass_destroy_callback)
1655 {
1656         int i;
1657
1658         f2fs_release_decomp_mem(dic, bypass_destroy_callback, true);
1659
1660         if (dic->tpages) {
1661                 for (i = 0; i < dic->cluster_size; i++) {
1662                         if (dic->rpages[i])
1663                                 continue;
1664                         if (!dic->tpages[i])
1665                                 continue;
1666                         f2fs_compress_free_page(dic->tpages[i]);
1667                 }
1668                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1669         }
1670
1671         if (dic->cpages) {
1672                 for (i = 0; i < dic->nr_cpages; i++) {
1673                         if (!dic->cpages[i])
1674                                 continue;
1675                         f2fs_compress_free_page(dic->cpages[i]);
1676                 }
1677                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1678         }
1679
1680         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1681         kmem_cache_free(dic_entry_slab, dic);
1682 }
1683
1684 static void f2fs_late_free_dic(struct work_struct *work)
1685 {
1686         struct decompress_io_ctx *dic =
1687                 container_of(work, struct decompress_io_ctx, free_work);
1688
1689         f2fs_free_dic(dic, false);
1690 }
1691
1692 static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
1693 {
1694         if (refcount_dec_and_test(&dic->refcnt)) {
1695                 if (in_task) {
1696                         f2fs_free_dic(dic, false);
1697                 } else {
1698                         INIT_WORK(&dic->free_work, f2fs_late_free_dic);
1699                         queue_work(F2FS_I_SB(dic->inode)->post_read_wq,
1700                                         &dic->free_work);
1701                 }
1702         }
1703 }
1704
1705 static void f2fs_verify_cluster(struct work_struct *work)
1706 {
1707         struct decompress_io_ctx *dic =
1708                 container_of(work, struct decompress_io_ctx, verity_work);
1709         int i;
1710
1711         /* Verify, update, and unlock the decompressed pages. */
1712         for (i = 0; i < dic->cluster_size; i++) {
1713                 struct page *rpage = dic->rpages[i];
1714
1715                 if (!rpage)
1716                         continue;
1717
1718                 if (fsverity_verify_page(rpage))
1719                         SetPageUptodate(rpage);
1720                 else
1721                         ClearPageUptodate(rpage);
1722                 unlock_page(rpage);
1723         }
1724
1725         f2fs_put_dic(dic, true);
1726 }
1727
1728 /*
1729  * This is called when a compressed cluster has been decompressed
1730  * (or failed to be read and/or decompressed).
1731  */
1732 void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
1733                                 bool in_task)
1734 {
1735         int i;
1736
1737         if (!failed && dic->need_verity) {
1738                 /*
1739                  * Note that to avoid deadlocks, the verity work can't be done
1740                  * on the decompression workqueue.  This is because verifying
1741                  * the data pages can involve reading metadata pages from the
1742                  * file, and these metadata pages may be compressed.
1743                  */
1744                 INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1745                 fsverity_enqueue_verify_work(&dic->verity_work);
1746                 return;
1747         }
1748
1749         /* Update and unlock the cluster's pagecache pages. */
1750         for (i = 0; i < dic->cluster_size; i++) {
1751                 struct page *rpage = dic->rpages[i];
1752
1753                 if (!rpage)
1754                         continue;
1755
1756                 if (failed)
1757                         ClearPageUptodate(rpage);
1758                 else
1759                         SetPageUptodate(rpage);
1760                 unlock_page(rpage);
1761         }
1762
1763         /*
1764          * Release the reference to the decompress_io_ctx that was being held
1765          * for I/O completion.
1766          */
1767         f2fs_put_dic(dic, in_task);
1768 }
1769
1770 /*
1771  * Put a reference to a compressed page's decompress_io_ctx.
1772  *
1773  * This is called when the page is no longer needed and can be freed.
1774  */
1775 void f2fs_put_page_dic(struct page *page, bool in_task)
1776 {
1777         struct decompress_io_ctx *dic =
1778                         (struct decompress_io_ctx *)page_private(page);
1779
1780         f2fs_put_dic(dic, in_task);
1781 }
1782
1783 /*
1784  * check whether cluster blocks are contiguous, and add extent cache entry
1785  * only if cluster blocks are logically and physically contiguous.
1786  */
1787 unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn)
1788 {
1789         bool compressed = f2fs_data_blkaddr(dn) == COMPRESS_ADDR;
1790         int i = compressed ? 1 : 0;
1791         block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page,
1792                                                 dn->ofs_in_node + i);
1793
1794         for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
1795                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
1796                                                 dn->ofs_in_node + i);
1797
1798                 if (!__is_valid_data_blkaddr(blkaddr))
1799                         break;
1800                 if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
1801                         return 0;
1802         }
1803
1804         return compressed ? i - 1 : i;
1805 }
1806
1807 const struct address_space_operations f2fs_compress_aops = {
1808         .release_folio = f2fs_release_folio,
1809         .invalidate_folio = f2fs_invalidate_folio,
1810         .migrate_folio  = filemap_migrate_folio,
1811 };
1812
1813 struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1814 {
1815         return sbi->compress_inode->i_mapping;
1816 }
1817
1818 void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
1819 {
1820         if (!sbi->compress_inode)
1821                 return;
1822         invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr);
1823 }
1824
1825 void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1826                                                 nid_t ino, block_t blkaddr)
1827 {
1828         struct page *cpage;
1829         int ret;
1830
1831         if (!test_opt(sbi, COMPRESS_CACHE))
1832                 return;
1833
1834         if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1835                 return;
1836
1837         if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
1838                 return;
1839
1840         cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
1841         if (cpage) {
1842                 f2fs_put_page(cpage, 0);
1843                 return;
1844         }
1845
1846         cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
1847         if (!cpage)
1848                 return;
1849
1850         ret = add_to_page_cache_lru(cpage, COMPRESS_MAPPING(sbi),
1851                                                 blkaddr, GFP_NOFS);
1852         if (ret) {
1853                 f2fs_put_page(cpage, 0);
1854                 return;
1855         }
1856
1857         set_page_private_data(cpage, ino);
1858
1859         if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1860                 goto out;
1861
1862         memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
1863         SetPageUptodate(cpage);
1864 out:
1865         f2fs_put_page(cpage, 1);
1866 }
1867
1868 bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1869                                                                 block_t blkaddr)
1870 {
1871         struct page *cpage;
1872         bool hitted = false;
1873
1874         if (!test_opt(sbi, COMPRESS_CACHE))
1875                 return false;
1876
1877         cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
1878                                 blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1879         if (cpage) {
1880                 if (PageUptodate(cpage)) {
1881                         atomic_inc(&sbi->compress_page_hit);
1882                         memcpy(page_address(page),
1883                                 page_address(cpage), PAGE_SIZE);
1884                         hitted = true;
1885                 }
1886                 f2fs_put_page(cpage, 1);
1887         }
1888
1889         return hitted;
1890 }
1891
1892 void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1893 {
1894         struct address_space *mapping = COMPRESS_MAPPING(sbi);
1895         struct folio_batch fbatch;
1896         pgoff_t index = 0;
1897         pgoff_t end = MAX_BLKADDR(sbi);
1898
1899         if (!mapping->nrpages)
1900                 return;
1901
1902         folio_batch_init(&fbatch);
1903
1904         do {
1905                 unsigned int nr, i;
1906
1907                 nr = filemap_get_folios(mapping, &index, end - 1, &fbatch);
1908                 if (!nr)
1909                         break;
1910
1911                 for (i = 0; i < nr; i++) {
1912                         struct folio *folio = fbatch.folios[i];
1913
1914                         folio_lock(folio);
1915                         if (folio->mapping != mapping) {
1916                                 folio_unlock(folio);
1917                                 continue;
1918                         }
1919
1920                         if (ino != get_page_private_data(&folio->page)) {
1921                                 folio_unlock(folio);
1922                                 continue;
1923                         }
1924
1925                         generic_error_remove_page(mapping, &folio->page);
1926                         folio_unlock(folio);
1927                 }
1928                 folio_batch_release(&fbatch);
1929                 cond_resched();
1930         } while (index < end);
1931 }
1932
1933 int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
1934 {
1935         struct inode *inode;
1936
1937         if (!test_opt(sbi, COMPRESS_CACHE))
1938                 return 0;
1939
1940         inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
1941         if (IS_ERR(inode))
1942                 return PTR_ERR(inode);
1943         sbi->compress_inode = inode;
1944
1945         sbi->compress_percent = COMPRESS_PERCENT;
1946         sbi->compress_watermark = COMPRESS_WATERMARK;
1947
1948         atomic_set(&sbi->compress_page_hit, 0);
1949
1950         return 0;
1951 }
1952
1953 void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
1954 {
1955         if (!sbi->compress_inode)
1956                 return;
1957         iput(sbi->compress_inode);
1958         sbi->compress_inode = NULL;
1959 }
1960
1961 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1962 {
1963         dev_t dev = sbi->sb->s_bdev->bd_dev;
1964         char slab_name[32];
1965
1966         if (!f2fs_sb_has_compression(sbi))
1967                 return 0;
1968
1969         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1970
1971         sbi->page_array_slab_size = sizeof(struct page *) <<
1972                                         F2FS_OPTION(sbi).compress_log_size;
1973
1974         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1975                                         sbi->page_array_slab_size);
1976         return sbi->page_array_slab ? 0 : -ENOMEM;
1977 }
1978
1979 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1980 {
1981         kmem_cache_destroy(sbi->page_array_slab);
1982 }
1983
1984 int __init f2fs_init_compress_cache(void)
1985 {
1986         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1987                                         sizeof(struct compress_io_ctx));
1988         if (!cic_entry_slab)
1989                 return -ENOMEM;
1990         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1991                                         sizeof(struct decompress_io_ctx));
1992         if (!dic_entry_slab)
1993                 goto free_cic;
1994         return 0;
1995 free_cic:
1996         kmem_cache_destroy(cic_entry_slab);
1997         return -ENOMEM;
1998 }
1999
2000 void f2fs_destroy_compress_cache(void)
2001 {
2002         kmem_cache_destroy(dic_entry_slab);
2003         kmem_cache_destroy(cic_entry_slab);
2004 }