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_flag >> COMPRESS_LEVEL_OFFSET)
 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 #ifdef CONFIG_F2FS_FS_LZ4HC
 268 static int lz4hc_compress_pages(struct compress_ctx *cc)
 269 {
 270         unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
 271                                                 COMPRESS_LEVEL_OFFSET;
 272         int len;
 273
 274         if (level)
 275                 len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 276                                         cc->clen, level, cc->private);
 277         else
 278                 len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 279                                                 cc->clen, cc->private);
 280         if (!len)
 281                 return -EAGAIN;
 282
 283         cc->clen = len;
 284         return 0;
 285 }
 286 #endif
 287
 288 static int lz4_compress_pages(struct compress_ctx *cc)
 289 {
 290         int len;
 291
 292 #ifdef CONFIG_F2FS_FS_LZ4HC
 293         return lz4hc_compress_pages(cc);
 294 #endif
 295         len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 296                                                 cc->clen, cc->private);
 297         if (!len)
 298                 return -EAGAIN;
 299
 300         cc->clen = len;
 301         return 0;
 302 }
 303
 304 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 305 {
 306         int ret;
 307
 308         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 309                                                 dic->clen, dic->rlen);
 310         if (ret < 0) {
 311                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 312                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 313                 return -EIO;
 314         }
 315
 316         if (ret != PAGE_SIZE << dic->log_cluster_size) {
 317                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
 318                                         "expected:%lu\n", KERN_ERR,
 319                                         F2FS_I_SB(dic->inode)->sb->s_id, ret,
 320                                         PAGE_SIZE << dic->log_cluster_size);
 321                 return -EIO;
 322         }
 323         return 0;
 324 }
 325
 326 static const struct f2fs_compress_ops f2fs_lz4_ops = {
 327         .init_compress_ctx      = lz4_init_compress_ctx,
 328         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 329         .compress_pages         = lz4_compress_pages,
 330         .decompress_pages       = lz4_decompress_pages,
 331 };
 332 #endif
 333
 334 #ifdef CONFIG_F2FS_FS_ZSTD
 335 #define F2FS_ZSTD_DEFAULT_CLEVEL        1
 336
 337 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 338 {
 339         zstd_parameters params;
 340         zstd_cstream *stream;
 341         void *workspace;
 342         unsigned int workspace_size;
 343         unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
 344                                                 COMPRESS_LEVEL_OFFSET;
 345
 346         if (!level)
 347                 level = F2FS_ZSTD_DEFAULT_CLEVEL;
 348
 349         params = zstd_get_params(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen);
 350         workspace_size = zstd_cstream_workspace_bound(&params.cParams);
 351
 352         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 353                                         workspace_size, GFP_NOFS);
 354         if (!workspace)
 355                 return -ENOMEM;
 356
 357         stream = zstd_init_cstream(&params, 0, workspace, workspace_size);
 358         if (!stream) {
 359                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n",
 360                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 361                                 __func__);
 362                 kvfree(workspace);
 363                 return -EIO;
 364         }
 365
 366         cc->private = workspace;
 367         cc->private2 = stream;
 368
 369         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 370         return 0;
 371 }
 372
 373 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 374 {
 375         kvfree(cc->private);
 376         cc->private = NULL;
 377         cc->private2 = NULL;
 378 }
 379
 380 static int zstd_compress_pages(struct compress_ctx *cc)
 381 {
 382         zstd_cstream *stream = cc->private2;
 383         zstd_in_buffer inbuf;
 384         zstd_out_buffer outbuf;
 385         int src_size = cc->rlen;
 386         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 387         int ret;
 388
 389         inbuf.pos = 0;
 390         inbuf.src = cc->rbuf;
 391         inbuf.size = src_size;
 392
 393         outbuf.pos = 0;
 394         outbuf.dst = cc->cbuf->cdata;
 395         outbuf.size = dst_size;
 396
 397         ret = zstd_compress_stream(stream, &outbuf, &inbuf);
 398         if (zstd_is_error(ret)) {
 399                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n",
 400                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 401                                 __func__, zstd_get_error_code(ret));
 402                 return -EIO;
 403         }
 404
 405         ret = zstd_end_stream(stream, &outbuf);
 406         if (zstd_is_error(ret)) {
 407                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n",
 408                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 409                                 __func__, zstd_get_error_code(ret));
 410                 return -EIO;
 411         }
 412
 413         /*
 414          * there is compressed data remained in intermediate buffer due to
 415          * no more space in cbuf.cdata
 416          */
 417         if (ret)
 418                 return -EAGAIN;
 419
 420         cc->clen = outbuf.pos;
 421         return 0;
 422 }
 423
 424 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 425 {
 426         zstd_dstream *stream;
 427         void *workspace;
 428         unsigned int workspace_size;
 429         unsigned int max_window_size =
 430                         MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 431
 432         workspace_size = zstd_dstream_workspace_bound(max_window_size);
 433
 434         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 435                                         workspace_size, GFP_NOFS);
 436         if (!workspace)
 437                 return -ENOMEM;
 438
 439         stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
 440         if (!stream) {
 441                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n",
 442                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 443                                 __func__);
 444                 kvfree(workspace);
 445                 return -EIO;
 446         }
 447
 448         dic->private = workspace;
 449         dic->private2 = stream;
 450
 451         return 0;
 452 }
 453
 454 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 455 {
 456         kvfree(dic->private);
 457         dic->private = NULL;
 458         dic->private2 = NULL;
 459 }
 460
 461 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 462 {
 463         zstd_dstream *stream = dic->private2;
 464         zstd_in_buffer inbuf;
 465         zstd_out_buffer outbuf;
 466         int ret;
 467
 468         inbuf.pos = 0;
 469         inbuf.src = dic->cbuf->cdata;
 470         inbuf.size = dic->clen;
 471
 472         outbuf.pos = 0;
 473         outbuf.dst = dic->rbuf;
 474         outbuf.size = dic->rlen;
 475
 476         ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
 477         if (zstd_is_error(ret)) {
 478                 printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n",
 479                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 480                                 __func__, zstd_get_error_code(ret));
 481                 return -EIO;
 482         }
 483
 484         if (dic->rlen != outbuf.pos) {
 485                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 486                                 "expected:%lu\n", KERN_ERR,
 487                                 F2FS_I_SB(dic->inode)->sb->s_id,
 488                                 __func__, dic->rlen,
 489                                 PAGE_SIZE << dic->log_cluster_size);
 490                 return -EIO;
 491         }
 492
 493         return 0;
 494 }
 495
 496 static const struct f2fs_compress_ops f2fs_zstd_ops = {
 497         .init_compress_ctx      = zstd_init_compress_ctx,
 498         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 499         .compress_pages         = zstd_compress_pages,
 500         .init_decompress_ctx    = zstd_init_decompress_ctx,
 501         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 502         .decompress_pages       = zstd_decompress_pages,
 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                 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
 516                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, 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 static mempool_t *compress_page_pool;
 562 static int num_compress_pages = 512;
 563 module_param(num_compress_pages, uint, 0444);
 564 MODULE_PARM_DESC(num_compress_pages,
 565                 "Number of intermediate compress pages to preallocate");
 566
 567 int f2fs_init_compress_mempool(void)
 568 {
 569         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 570         if (!compress_page_pool)
 571                 return -ENOMEM;
 572
 573         return 0;
 574 }
 575
 576 void f2fs_destroy_compress_mempool(void)
 577 {
 578         mempool_destroy(compress_page_pool);
 579 }
 580
 581 static struct page *f2fs_compress_alloc_page(void)
 582 {
 583         struct page *page;
 584
 585         page = mempool_alloc(compress_page_pool, GFP_NOFS);
 586         lock_page(page);
 587
 588         return page;
 589 }
 590
 591 static void f2fs_compress_free_page(struct page *page)
 592 {
 593         if (!page)
 594                 return;
 595         detach_page_private(page);
 596         page->mapping = NULL;
 597         unlock_page(page);
 598         mempool_free(page, compress_page_pool);
 599 }
 600
 601 #define MAX_VMAP_RETRIES        3
 602
 603 static void *f2fs_vmap(struct page **pages, unsigned int count)
 604 {
 605         int i;
 606         void *buf = NULL;
 607
 608         for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 609                 buf = vm_map_ram(pages, count, -1);
 610                 if (buf)
 611                         break;
 612                 vm_unmap_aliases();
 613         }
 614         return buf;
 615 }
 616
 617 static int f2fs_compress_pages(struct compress_ctx *cc)
 618 {
 619         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 620         const struct f2fs_compress_ops *cops =
 621                                 f2fs_cops[fi->i_compress_algorithm];
 622         unsigned int max_len, new_nr_cpages;
 623         u32 chksum = 0;
 624         int i, ret;
 625
 626         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 627                                 cc->cluster_size, fi->i_compress_algorithm);
 628
 629         if (cops->init_compress_ctx) {
 630                 ret = cops->init_compress_ctx(cc);
 631                 if (ret)
 632                         goto out;
 633         }
 634
 635         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 636         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 637         cc->valid_nr_cpages = cc->nr_cpages;
 638
 639         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 640         if (!cc->cpages) {
 641                 ret = -ENOMEM;
 642                 goto destroy_compress_ctx;
 643         }
 644
 645         for (i = 0; i < cc->nr_cpages; i++) {
 646                 cc->cpages[i] = f2fs_compress_alloc_page();
 647                 if (!cc->cpages[i]) {
 648                         ret = -ENOMEM;
 649                         goto out_free_cpages;
 650                 }
 651         }
 652
 653         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 654         if (!cc->rbuf) {
 655                 ret = -ENOMEM;
 656                 goto out_free_cpages;
 657         }
 658
 659         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 660         if (!cc->cbuf) {
 661                 ret = -ENOMEM;
 662                 goto out_vunmap_rbuf;
 663         }
 664
 665         ret = cops->compress_pages(cc);
 666         if (ret)
 667                 goto out_vunmap_cbuf;
 668
 669         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 670
 671         if (cc->clen > max_len) {
 672                 ret = -EAGAIN;
 673                 goto out_vunmap_cbuf;
 674         }
 675
 676         cc->cbuf->clen = cpu_to_le32(cc->clen);
 677
 678         if (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)
 679                 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
 680                                         cc->cbuf->cdata, cc->clen);
 681         cc->cbuf->chksum = cpu_to_le32(chksum);
 682
 683         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 684                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 685
 686         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 687
 688         /* zero out any unused part of the last page */
 689         memset(&cc->cbuf->cdata[cc->clen], 0,
 690                         (new_nr_cpages * PAGE_SIZE) -
 691                         (cc->clen + COMPRESS_HEADER_SIZE));
 692
 693         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 694         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 695
 696         for (i = 0; i < cc->nr_cpages; i++) {
 697                 if (i < new_nr_cpages)
 698                         continue;
 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                 goto out_release;
 766         }
 767
 768         ret = cops->decompress_pages(dic);
 769
 770         if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
 771                 u32 provided = le32_to_cpu(dic->cbuf->chksum);
 772                 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
 773
 774                 if (provided != calculated) {
 775                         if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 776                                 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 777                                 printk_ratelimited(
 778                                         "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
 779                                         KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
 780                                         provided, calculated);
 781                         }
 782                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 783                 }
 784         }
 785
 786 out_release:
 787         f2fs_release_decomp_mem(dic, bypass_callback, false);
 788
 789 out_end_io:
 790         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 791                                                         dic->clen, ret);
 792         f2fs_decompress_end_io(dic, ret, in_task);
 793 }
 794
 795 /*
 796  * This is called when a page of a compressed cluster has been read from disk
 797  * (or failed to be read from disk).  It checks whether this page was the last
 798  * page being waited on in the cluster, and if so, it decompresses the cluster
 799  * (or in the case of a failure, cleans up without actually decompressing).
 800  */
 801 void f2fs_end_read_compressed_page(struct page *page, bool failed,
 802                 block_t blkaddr, bool in_task)
 803 {
 804         struct decompress_io_ctx *dic =
 805                         (struct decompress_io_ctx *)page_private(page);
 806         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 807
 808         dec_page_count(sbi, F2FS_RD_DATA);
 809
 810         if (failed)
 811                 WRITE_ONCE(dic->failed, true);
 812         else if (blkaddr && in_task)
 813                 f2fs_cache_compressed_page(sbi, page,
 814                                         dic->inode->i_ino, blkaddr);
 815
 816         if (atomic_dec_and_test(&dic->remaining_pages))
 817                 f2fs_decompress_cluster(dic, in_task);
 818 }
 819
 820 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 821 {
 822         if (cc->cluster_idx == NULL_CLUSTER)
 823                 return true;
 824         return cc->cluster_idx == cluster_idx(cc, index);
 825 }
 826
 827 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 828 {
 829         return cc->nr_rpages == 0;
 830 }
 831
 832 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 833 {
 834         return cc->cluster_size == cc->nr_rpages;
 835 }
 836
 837 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 838 {
 839         if (f2fs_cluster_is_empty(cc))
 840                 return true;
 841         return is_page_in_cluster(cc, index);
 842 }
 843
 844 bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
 845                                 int index, int nr_pages, bool uptodate)
 846 {
 847         unsigned long pgidx = pages[index]->index;
 848         int i = uptodate ? 0 : 1;
 849
 850         /*
 851          * when uptodate set to true, try to check all pages in cluster is
 852          * uptodate or not.
 853          */
 854         if (uptodate && (pgidx % cc->cluster_size))
 855                 return false;
 856
 857         if (nr_pages - index < cc->cluster_size)
 858                 return false;
 859
 860         for (; i < cc->cluster_size; i++) {
 861                 if (pages[index + i]->index != pgidx + i)
 862                         return false;
 863                 if (uptodate && !PageUptodate(pages[index + i]))
 864                         return false;
 865         }
 866
 867         return true;
 868 }
 869
 870 static bool cluster_has_invalid_data(struct compress_ctx *cc)
 871 {
 872         loff_t i_size = i_size_read(cc->inode);
 873         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 874         int i;
 875
 876         for (i = 0; i < cc->cluster_size; i++) {
 877                 struct page *page = cc->rpages[i];
 878
 879                 f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
 880
 881                 /* beyond EOF */
 882                 if (page->index >= nr_pages)
 883                         return true;
 884         }
 885         return false;
 886 }
 887
 888 bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
 889 {
 890         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 891         unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
 892         bool compressed = dn->data_blkaddr == COMPRESS_ADDR;
 893         int cluster_end = 0;
 894         int i;
 895         char *reason = "";
 896
 897         if (!compressed)
 898                 return false;
 899
 900         /* [..., COMPR_ADDR, ...] */
 901         if (dn->ofs_in_node % cluster_size) {
 902                 reason = "[*|C|*|*]";
 903                 goto out;
 904         }
 905
 906         for (i = 1; i < cluster_size; i++) {
 907                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
 908                                                         dn->ofs_in_node + i);
 909
 910                 /* [COMPR_ADDR, ..., COMPR_ADDR] */
 911                 if (blkaddr == COMPRESS_ADDR) {
 912                         reason = "[C|*|C|*]";
 913                         goto out;
 914                 }
 915                 if (compressed) {
 916                         if (!__is_valid_data_blkaddr(blkaddr)) {
 917                                 if (!cluster_end)
 918                                         cluster_end = i;
 919                                 continue;
 920                         }
 921                         /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
 922                         if (cluster_end) {
 923                                 reason = "[C|N|N|V]";
 924                                 goto out;
 925                         }
 926                 }
 927         }
 928         return false;
 929 out:
 930         f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
 931                         dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
 932         set_sbi_flag(sbi, SBI_NEED_FSCK);
 933         return true;
 934 }
 935
 936 static int __f2fs_cluster_blocks(struct inode *inode,
 937                                 unsigned int cluster_idx, bool compr)
 938 {
 939         struct dnode_of_data dn;
 940         unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
 941         unsigned int start_idx = cluster_idx <<
 942                                 F2FS_I(inode)->i_log_cluster_size;
 943         int ret;
 944
 945         set_new_dnode(&dn, inode, NULL, NULL, 0);
 946         ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
 947         if (ret) {
 948                 if (ret == -ENOENT)
 949                         ret = 0;
 950                 goto fail;
 951         }
 952
 953         if (f2fs_sanity_check_cluster(&dn)) {
 954                 ret = -EFSCORRUPTED;
 955                 goto fail;
 956         }
 957
 958         if (dn.data_blkaddr == COMPRESS_ADDR) {
 959                 int i;
 960
 961                 ret = 1;
 962                 for (i = 1; i < cluster_size; i++) {
 963                         block_t blkaddr;
 964
 965                         blkaddr = data_blkaddr(dn.inode,
 966                                         dn.node_page, dn.ofs_in_node + i);
 967                         if (compr) {
 968                                 if (__is_valid_data_blkaddr(blkaddr))
 969                                         ret++;
 970                         } else {
 971                                 if (blkaddr != NULL_ADDR)
 972                                         ret++;
 973                         }
 974                 }
 975
 976                 f2fs_bug_on(F2FS_I_SB(inode),
 977                         !compr && ret != cluster_size &&
 978                         !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
 979         }
 980 fail:
 981         f2fs_put_dnode(&dn);
 982         return ret;
 983 }
 984
 985 /* return # of compressed blocks in compressed cluster */
 986 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 987 {
 988         return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
 989 }
 990
 991 /* return # of valid blocks in compressed cluster */
 992 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 993 {
 994         return __f2fs_cluster_blocks(inode,
 995                 index >> F2FS_I(inode)->i_log_cluster_size,
 996                 false);
 997 }
 998
 999 static bool cluster_may_compress(struct compress_ctx *cc)
1000 {
1001         if (!f2fs_need_compress_data(cc->inode))
1002                 return false;
1003         if (f2fs_is_atomic_file(cc->inode))
1004                 return false;
1005         if (!f2fs_cluster_is_full(cc))
1006                 return false;
1007         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
1008                 return false;
1009         return !cluster_has_invalid_data(cc);
1010 }
1011
1012 static void set_cluster_writeback(struct compress_ctx *cc)
1013 {
1014         int i;
1015
1016         for (i = 0; i < cc->cluster_size; i++) {
1017                 if (cc->rpages[i])
1018                         set_page_writeback(cc->rpages[i]);
1019         }
1020 }
1021
1022 static void set_cluster_dirty(struct compress_ctx *cc)
1023 {
1024         int i;
1025
1026         for (i = 0; i < cc->cluster_size; i++)
1027                 if (cc->rpages[i])
1028                         set_page_dirty(cc->rpages[i]);
1029 }
1030
1031 static int prepare_compress_overwrite(struct compress_ctx *cc,
1032                 struct page **pagep, pgoff_t index, void **fsdata)
1033 {
1034         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1035         struct address_space *mapping = cc->inode->i_mapping;
1036         struct page *page;
1037         sector_t last_block_in_bio;
1038         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
1039         pgoff_t start_idx = start_idx_of_cluster(cc);
1040         int i, ret;
1041
1042 retry:
1043         ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
1044         if (ret <= 0)
1045                 return ret;
1046
1047         ret = f2fs_init_compress_ctx(cc);
1048         if (ret)
1049                 return ret;
1050
1051         /* keep page reference to avoid page reclaim */
1052         for (i = 0; i < cc->cluster_size; i++) {
1053                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1054                                                         fgp_flag, GFP_NOFS);
1055                 if (!page) {
1056                         ret = -ENOMEM;
1057                         goto unlock_pages;
1058                 }
1059
1060                 if (PageUptodate(page))
1061                         f2fs_put_page(page, 1);
1062                 else
1063                         f2fs_compress_ctx_add_page(cc, page);
1064         }
1065
1066         if (!f2fs_cluster_is_empty(cc)) {
1067                 struct bio *bio = NULL;
1068
1069                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1070                                         &last_block_in_bio, false, true);
1071                 f2fs_put_rpages(cc);
1072                 f2fs_destroy_compress_ctx(cc, true);
1073                 if (ret)
1074                         goto out;
1075                 if (bio)
1076                         f2fs_submit_bio(sbi, bio, DATA);
1077
1078                 ret = f2fs_init_compress_ctx(cc);
1079                 if (ret)
1080                         goto out;
1081         }
1082
1083         for (i = 0; i < cc->cluster_size; i++) {
1084                 f2fs_bug_on(sbi, cc->rpages[i]);
1085
1086                 page = find_lock_page(mapping, start_idx + i);
1087                 if (!page) {
1088                         /* page can be truncated */
1089                         goto release_and_retry;
1090                 }
1091
1092                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1093                 f2fs_compress_ctx_add_page(cc, page);
1094
1095                 if (!PageUptodate(page)) {
1096 release_and_retry:
1097                         f2fs_put_rpages(cc);
1098                         f2fs_unlock_rpages(cc, i + 1);
1099                         f2fs_destroy_compress_ctx(cc, true);
1100                         goto retry;
1101                 }
1102         }
1103
1104         if (likely(!ret)) {
1105                 *fsdata = cc->rpages;
1106                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1107                 return cc->cluster_size;
1108         }
1109
1110 unlock_pages:
1111         f2fs_put_rpages(cc);
1112         f2fs_unlock_rpages(cc, i);
1113         f2fs_destroy_compress_ctx(cc, true);
1114 out:
1115         return ret;
1116 }
1117
1118 int f2fs_prepare_compress_overwrite(struct inode *inode,
1119                 struct page **pagep, pgoff_t index, void **fsdata)
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                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1126                 .rpages = NULL,
1127                 .nr_rpages = 0,
1128         };
1129
1130         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1131 }
1132
1133 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1134                                         pgoff_t index, unsigned copied)
1135
1136 {
1137         struct compress_ctx cc = {
1138                 .inode = inode,
1139                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1140                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1141                 .rpages = fsdata,
1142         };
1143         bool first_index = (index == cc.rpages[0]->index);
1144
1145         if (copied)
1146                 set_cluster_dirty(&cc);
1147
1148         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1149         f2fs_destroy_compress_ctx(&cc, false);
1150
1151         return first_index;
1152 }
1153
1154 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1155 {
1156         void *fsdata = NULL;
1157         struct page *pagep;
1158         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1159         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1160                                                         log_cluster_size;
1161         int err;
1162
1163         err = f2fs_is_compressed_cluster(inode, start_idx);
1164         if (err < 0)
1165                 return err;
1166
1167         /* truncate normal cluster */
1168         if (!err)
1169                 return f2fs_do_truncate_blocks(inode, from, lock);
1170
1171         /* truncate compressed cluster */
1172         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1173                                                 start_idx, &fsdata);
1174
1175         /* should not be a normal cluster */
1176         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1177
1178         if (err <= 0)
1179                 return err;
1180
1181         if (err > 0) {
1182                 struct page **rpages = fsdata;
1183                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1184                 int i;
1185
1186                 for (i = cluster_size - 1; i >= 0; i--) {
1187                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1188
1189                         if (from <= start) {
1190                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1191                         } else {
1192                                 zero_user_segment(rpages[i], from - start,
1193                                                                 PAGE_SIZE);
1194                                 break;
1195                         }
1196                 }
1197
1198                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1199         }
1200         return 0;
1201 }
1202
1203 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1204                                         int *submitted,
1205                                         struct writeback_control *wbc,
1206                                         enum iostat_type io_type)
1207 {
1208         struct inode *inode = cc->inode;
1209         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1210         struct f2fs_inode_info *fi = F2FS_I(inode);
1211         struct f2fs_io_info fio = {
1212                 .sbi = sbi,
1213                 .ino = cc->inode->i_ino,
1214                 .type = DATA,
1215                 .op = REQ_OP_WRITE,
1216                 .op_flags = wbc_to_write_flags(wbc),
1217                 .old_blkaddr = NEW_ADDR,
1218                 .page = NULL,
1219                 .encrypted_page = NULL,
1220                 .compressed_page = NULL,
1221                 .submitted = false,
1222                 .io_type = io_type,
1223                 .io_wbc = wbc,
1224                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1225         };
1226         struct dnode_of_data dn;
1227         struct node_info ni;
1228         struct compress_io_ctx *cic;
1229         pgoff_t start_idx = start_idx_of_cluster(cc);
1230         unsigned int last_index = cc->cluster_size - 1;
1231         loff_t psize;
1232         int i, err;
1233
1234         /* we should bypass data pages to proceed the kworkder jobs */
1235         if (unlikely(f2fs_cp_error(sbi))) {
1236                 mapping_set_error(cc->rpages[0]->mapping, -EIO);
1237                 goto out_free;
1238         }
1239
1240         if (IS_NOQUOTA(inode)) {
1241                 /*
1242                  * We need to wait for node_write to avoid block allocation during
1243                  * checkpoint. This can only happen to quota writes which can cause
1244                  * the below discard race condition.
1245                  */
1246                 f2fs_down_read(&sbi->node_write);
1247         } else if (!f2fs_trylock_op(sbi)) {
1248                 goto out_free;
1249         }
1250
1251         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1252
1253         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1254         if (err)
1255                 goto out_unlock_op;
1256
1257         for (i = 0; i < cc->cluster_size; i++) {
1258                 if (data_blkaddr(dn.inode, dn.node_page,
1259                                         dn.ofs_in_node + i) == NULL_ADDR)
1260                         goto out_put_dnode;
1261         }
1262
1263         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1264
1265         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
1266         if (err)
1267                 goto out_put_dnode;
1268
1269         fio.version = ni.version;
1270
1271         cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1272         if (!cic)
1273                 goto out_put_dnode;
1274
1275         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1276         cic->inode = inode;
1277         atomic_set(&cic->pending_pages, cc->valid_nr_cpages);
1278         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1279         if (!cic->rpages)
1280                 goto out_put_cic;
1281
1282         cic->nr_rpages = cc->cluster_size;
1283
1284         for (i = 0; i < cc->valid_nr_cpages; i++) {
1285                 f2fs_set_compressed_page(cc->cpages[i], inode,
1286                                         cc->rpages[i + 1]->index, cic);
1287                 fio.compressed_page = cc->cpages[i];
1288
1289                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1290                                                 dn.ofs_in_node + i + 1);
1291
1292                 /* wait for GCed page writeback via META_MAPPING */
1293                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1294
1295                 if (fio.encrypted) {
1296                         fio.page = cc->rpages[i + 1];
1297                         err = f2fs_encrypt_one_page(&fio);
1298                         if (err)
1299                                 goto out_destroy_crypt;
1300                         cc->cpages[i] = fio.encrypted_page;
1301                 }
1302         }
1303
1304         set_cluster_writeback(cc);
1305
1306         for (i = 0; i < cc->cluster_size; i++)
1307                 cic->rpages[i] = cc->rpages[i];
1308
1309         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1310                 block_t blkaddr;
1311
1312                 blkaddr = f2fs_data_blkaddr(&dn);
1313                 fio.page = cc->rpages[i];
1314                 fio.old_blkaddr = blkaddr;
1315
1316                 /* cluster header */
1317                 if (i == 0) {
1318                         if (blkaddr == COMPRESS_ADDR)
1319                                 fio.compr_blocks++;
1320                         if (__is_valid_data_blkaddr(blkaddr))
1321                                 f2fs_invalidate_blocks(sbi, blkaddr);
1322                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1323                         goto unlock_continue;
1324                 }
1325
1326                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1327                         fio.compr_blocks++;
1328
1329                 if (i > cc->valid_nr_cpages) {
1330                         if (__is_valid_data_blkaddr(blkaddr)) {
1331                                 f2fs_invalidate_blocks(sbi, blkaddr);
1332                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1333                         }
1334                         goto unlock_continue;
1335                 }
1336
1337                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1338
1339                 if (fio.encrypted)
1340                         fio.encrypted_page = cc->cpages[i - 1];
1341                 else
1342                         fio.compressed_page = cc->cpages[i - 1];
1343
1344                 cc->cpages[i - 1] = NULL;
1345                 f2fs_outplace_write_data(&dn, &fio);
1346                 (*submitted)++;
1347 unlock_continue:
1348                 inode_dec_dirty_pages(cc->inode);
1349                 unlock_page(fio.page);
1350         }
1351
1352         if (fio.compr_blocks)
1353                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1354         f2fs_i_compr_blocks_update(inode, cc->valid_nr_cpages, true);
1355         add_compr_block_stat(inode, cc->valid_nr_cpages);
1356
1357         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1358         if (cc->cluster_idx == 0)
1359                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1360
1361         f2fs_put_dnode(&dn);
1362         if (IS_NOQUOTA(inode))
1363                 f2fs_up_read(&sbi->node_write);
1364         else
1365                 f2fs_unlock_op(sbi);
1366
1367         spin_lock(&fi->i_size_lock);
1368         if (fi->last_disk_size < psize)
1369                 fi->last_disk_size = psize;
1370         spin_unlock(&fi->i_size_lock);
1371
1372         f2fs_put_rpages(cc);
1373         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1374         cc->cpages = NULL;
1375         f2fs_destroy_compress_ctx(cc, false);
1376         return 0;
1377
1378 out_destroy_crypt:
1379         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1380
1381         for (--i; i >= 0; i--)
1382                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1383 out_put_cic:
1384         kmem_cache_free(cic_entry_slab, cic);
1385 out_put_dnode:
1386         f2fs_put_dnode(&dn);
1387 out_unlock_op:
1388         if (IS_NOQUOTA(inode))
1389                 f2fs_up_read(&sbi->node_write);
1390         else
1391                 f2fs_unlock_op(sbi);
1392 out_free:
1393         for (i = 0; i < cc->valid_nr_cpages; i++) {
1394                 f2fs_compress_free_page(cc->cpages[i]);
1395                 cc->cpages[i] = NULL;
1396         }
1397         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1398         cc->cpages = NULL;
1399         return -EAGAIN;
1400 }
1401
1402 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1403 {
1404         struct f2fs_sb_info *sbi = bio->bi_private;
1405         struct compress_io_ctx *cic =
1406                         (struct compress_io_ctx *)page_private(page);
1407         int i;
1408
1409         if (unlikely(bio->bi_status))
1410                 mapping_set_error(cic->inode->i_mapping, -EIO);
1411
1412         f2fs_compress_free_page(page);
1413
1414         dec_page_count(sbi, F2FS_WB_DATA);
1415
1416         if (atomic_dec_return(&cic->pending_pages))
1417                 return;
1418
1419         for (i = 0; i < cic->nr_rpages; i++) {
1420                 WARN_ON(!cic->rpages[i]);
1421                 clear_page_private_gcing(cic->rpages[i]);
1422                 end_page_writeback(cic->rpages[i]);
1423         }
1424
1425         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1426         kmem_cache_free(cic_entry_slab, cic);
1427 }
1428
1429 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1430                                         int *submitted,
1431                                         struct writeback_control *wbc,
1432                                         enum iostat_type io_type)
1433 {
1434         struct address_space *mapping = cc->inode->i_mapping;
1435         int _submitted, compr_blocks, ret, i;
1436
1437         compr_blocks = f2fs_compressed_blocks(cc);
1438
1439         for (i = 0; i < cc->cluster_size; i++) {
1440                 if (!cc->rpages[i])
1441                         continue;
1442
1443                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1444                 unlock_page(cc->rpages[i]);
1445         }
1446
1447         if (compr_blocks < 0)
1448                 return compr_blocks;
1449
1450         for (i = 0; i < cc->cluster_size; i++) {
1451                 if (!cc->rpages[i])
1452                         continue;
1453 retry_write:
1454                 lock_page(cc->rpages[i]);
1455
1456                 if (cc->rpages[i]->mapping != mapping) {
1457 continue_unlock:
1458                         unlock_page(cc->rpages[i]);
1459                         continue;
1460                 }
1461
1462                 if (!PageDirty(cc->rpages[i]))
1463                         goto continue_unlock;
1464
1465                 if (!clear_page_dirty_for_io(cc->rpages[i]))
1466                         goto continue_unlock;
1467
1468                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1469                                                 NULL, NULL, wbc, io_type,
1470                                                 compr_blocks, false);
1471                 if (ret) {
1472                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1473                                 unlock_page(cc->rpages[i]);
1474                                 ret = 0;
1475                         } else if (ret == -EAGAIN) {
1476                                 /*
1477                                  * for quota file, just redirty left pages to
1478                                  * avoid deadlock caused by cluster update race
1479                                  * from foreground operation.
1480                                  */
1481                                 if (IS_NOQUOTA(cc->inode))
1482                                         return 0;
1483                                 ret = 0;
1484                                 f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
1485                                 goto retry_write;
1486                         }
1487                         return ret;
1488                 }
1489
1490                 *submitted += _submitted;
1491         }
1492
1493         f2fs_balance_fs(F2FS_M_SB(mapping), true);
1494
1495         return 0;
1496 }
1497
1498 int f2fs_write_multi_pages(struct compress_ctx *cc,
1499                                         int *submitted,
1500                                         struct writeback_control *wbc,
1501                                         enum iostat_type io_type)
1502 {
1503         int err;
1504
1505         *submitted = 0;
1506         if (cluster_may_compress(cc)) {
1507                 err = f2fs_compress_pages(cc);
1508                 if (err == -EAGAIN) {
1509                         add_compr_block_stat(cc->inode, cc->cluster_size);
1510                         goto write;
1511                 } else if (err) {
1512                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1513                         goto destroy_out;
1514                 }
1515
1516                 err = f2fs_write_compressed_pages(cc, submitted,
1517                                                         wbc, io_type);
1518                 if (!err)
1519                         return 0;
1520                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1521         }
1522 write:
1523         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1524
1525         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1526         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1527 destroy_out:
1528         f2fs_destroy_compress_ctx(cc, false);
1529         return err;
1530 }
1531
1532 static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
1533                 bool pre_alloc)
1534 {
1535         return pre_alloc ^ f2fs_low_mem_mode(sbi);
1536 }
1537
1538 static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
1539                 bool pre_alloc)
1540 {
1541         const struct f2fs_compress_ops *cops =
1542                 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1543         int i;
1544
1545         if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1546                 return 0;
1547
1548         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
1549         if (!dic->tpages)
1550                 return -ENOMEM;
1551
1552         for (i = 0; i < dic->cluster_size; i++) {
1553                 if (dic->rpages[i]) {
1554                         dic->tpages[i] = dic->rpages[i];
1555                         continue;
1556                 }
1557
1558                 dic->tpages[i] = f2fs_compress_alloc_page();
1559                 if (!dic->tpages[i])
1560                         return -ENOMEM;
1561         }
1562
1563         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
1564         if (!dic->rbuf)
1565                 return -ENOMEM;
1566
1567         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
1568         if (!dic->cbuf)
1569                 return -ENOMEM;
1570
1571         if (cops->init_decompress_ctx) {
1572                 int ret = cops->init_decompress_ctx(dic);
1573
1574                 if (ret)
1575                         return ret;
1576         }
1577
1578         return 0;
1579 }
1580
1581 static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
1582                 bool bypass_destroy_callback, bool pre_alloc)
1583 {
1584         const struct f2fs_compress_ops *cops =
1585                 f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
1586
1587         if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
1588                 return;
1589
1590         if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
1591                 cops->destroy_decompress_ctx(dic);
1592
1593         if (dic->cbuf)
1594                 vm_unmap_ram(dic->cbuf, dic->nr_cpages);
1595
1596         if (dic->rbuf)
1597                 vm_unmap_ram(dic->rbuf, dic->cluster_size);
1598 }
1599
1600 static void f2fs_free_dic(struct decompress_io_ctx *dic,
1601                 bool bypass_destroy_callback);
1602
1603 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1604 {
1605         struct decompress_io_ctx *dic;
1606         pgoff_t start_idx = start_idx_of_cluster(cc);
1607         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1608         int i, ret;
1609
1610         dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO, false, sbi);
1611         if (!dic)
1612                 return ERR_PTR(-ENOMEM);
1613
1614         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1615         if (!dic->rpages) {
1616                 kmem_cache_free(dic_entry_slab, dic);
1617                 return ERR_PTR(-ENOMEM);
1618         }
1619
1620         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1621         dic->inode = cc->inode;
1622         atomic_set(&dic->remaining_pages, cc->nr_cpages);
1623         dic->cluster_idx = cc->cluster_idx;
1624         dic->cluster_size = cc->cluster_size;
1625         dic->log_cluster_size = cc->log_cluster_size;
1626         dic->nr_cpages = cc->nr_cpages;
1627         refcount_set(&dic->refcnt, 1);
1628         dic->failed = false;
1629         dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
1630
1631         for (i = 0; i < dic->cluster_size; i++)
1632                 dic->rpages[i] = cc->rpages[i];
1633         dic->nr_rpages = cc->cluster_size;
1634
1635         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1636         if (!dic->cpages) {
1637                 ret = -ENOMEM;
1638                 goto out_free;
1639         }
1640
1641         for (i = 0; i < dic->nr_cpages; i++) {
1642                 struct page *page;
1643
1644                 page = f2fs_compress_alloc_page();
1645                 if (!page) {
1646                         ret = -ENOMEM;
1647                         goto out_free;
1648                 }
1649
1650                 f2fs_set_compressed_page(page, cc->inode,
1651                                         start_idx + i + 1, dic);
1652                 dic->cpages[i] = page;
1653         }
1654
1655         ret = f2fs_prepare_decomp_mem(dic, true);
1656         if (ret)
1657                 goto out_free;
1658
1659         return dic;
1660
1661 out_free:
1662         f2fs_free_dic(dic, true);
1663         return ERR_PTR(ret);
1664 }
1665
1666 static void f2fs_free_dic(struct decompress_io_ctx *dic,
1667                 bool bypass_destroy_callback)
1668 {
1669         int i;
1670
1671         f2fs_release_decomp_mem(dic, bypass_destroy_callback, true);
1672
1673         if (dic->tpages) {
1674                 for (i = 0; i < dic->cluster_size; i++) {
1675                         if (dic->rpages[i])
1676                                 continue;
1677                         if (!dic->tpages[i])
1678                                 continue;
1679                         f2fs_compress_free_page(dic->tpages[i]);
1680                 }
1681                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1682         }
1683
1684         if (dic->cpages) {
1685                 for (i = 0; i < dic->nr_cpages; i++) {
1686                         if (!dic->cpages[i])
1687                                 continue;
1688                         f2fs_compress_free_page(dic->cpages[i]);
1689                 }
1690                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1691         }
1692
1693         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1694         kmem_cache_free(dic_entry_slab, dic);
1695 }
1696
1697 static void f2fs_late_free_dic(struct work_struct *work)
1698 {
1699         struct decompress_io_ctx *dic =
1700                 container_of(work, struct decompress_io_ctx, free_work);
1701
1702         f2fs_free_dic(dic, false);
1703 }
1704
1705 static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
1706 {
1707         if (refcount_dec_and_test(&dic->refcnt)) {
1708                 if (in_task) {
1709                         f2fs_free_dic(dic, false);
1710                 } else {
1711                         INIT_WORK(&dic->free_work, f2fs_late_free_dic);
1712                         queue_work(F2FS_I_SB(dic->inode)->post_read_wq,
1713                                         &dic->free_work);
1714                 }
1715         }
1716 }
1717
1718 /*
1719  * Update and unlock the cluster's pagecache pages, and release the reference to
1720  * the decompress_io_ctx that was being held for I/O completion.
1721  */
1722 static void __f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
1723                                 bool in_task)
1724 {
1725         int i;
1726
1727         for (i = 0; i < dic->cluster_size; i++) {
1728                 struct page *rpage = dic->rpages[i];
1729
1730                 if (!rpage)
1731                         continue;
1732
1733                 /* PG_error was set if verity failed. */
1734                 if (failed || PageError(rpage)) {
1735                         ClearPageUptodate(rpage);
1736                         /* will re-read again later */
1737                         ClearPageError(rpage);
1738                 } else {
1739                         SetPageUptodate(rpage);
1740                 }
1741                 unlock_page(rpage);
1742         }
1743
1744         f2fs_put_dic(dic, in_task);
1745 }
1746
1747 static void f2fs_verify_cluster(struct work_struct *work)
1748 {
1749         struct decompress_io_ctx *dic =
1750                 container_of(work, struct decompress_io_ctx, verity_work);
1751         int i;
1752
1753         /* Verify the cluster's decompressed pages with fs-verity. */
1754         for (i = 0; i < dic->cluster_size; i++) {
1755                 struct page *rpage = dic->rpages[i];
1756
1757                 if (rpage && !fsverity_verify_page(rpage))
1758                         SetPageError(rpage);
1759         }
1760
1761         __f2fs_decompress_end_io(dic, false, true);
1762 }
1763
1764 /*
1765  * This is called when a compressed cluster has been decompressed
1766  * (or failed to be read and/or decompressed).
1767  */
1768 void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
1769                                 bool in_task)
1770 {
1771         if (!failed && dic->need_verity) {
1772                 /*
1773                  * Note that to avoid deadlocks, the verity work can't be done
1774                  * on the decompression workqueue.  This is because verifying
1775                  * the data pages can involve reading metadata pages from the
1776                  * file, and these metadata pages may be compressed.
1777                  */
1778                 INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
1779                 fsverity_enqueue_verify_work(&dic->verity_work);
1780         } else {
1781                 __f2fs_decompress_end_io(dic, failed, in_task);
1782         }
1783 }
1784
1785 /*
1786  * Put a reference to a compressed page's decompress_io_ctx.
1787  *
1788  * This is called when the page is no longer needed and can be freed.
1789  */
1790 void f2fs_put_page_dic(struct page *page, bool in_task)
1791 {
1792         struct decompress_io_ctx *dic =
1793                         (struct decompress_io_ctx *)page_private(page);
1794
1795         f2fs_put_dic(dic, in_task);
1796 }
1797
1798 /*
1799  * check whether cluster blocks are contiguous, and add extent cache entry
1800  * only if cluster blocks are logically and physically contiguous.
1801  */
1802 unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn)
1803 {
1804         bool compressed = f2fs_data_blkaddr(dn) == COMPRESS_ADDR;
1805         int i = compressed ? 1 : 0;
1806         block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page,
1807                                                 dn->ofs_in_node + i);
1808
1809         for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
1810                 block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
1811                                                 dn->ofs_in_node + i);
1812
1813                 if (!__is_valid_data_blkaddr(blkaddr))
1814                         break;
1815                 if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
1816                         return 0;
1817         }
1818
1819         return compressed ? i - 1 : i;
1820 }
1821
1822 const struct address_space_operations f2fs_compress_aops = {
1823         .release_folio = f2fs_release_folio,
1824         .invalidate_folio = f2fs_invalidate_folio,
1825 };
1826
1827 struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
1828 {
1829         return sbi->compress_inode->i_mapping;
1830 }
1831
1832 void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
1833 {
1834         if (!sbi->compress_inode)
1835                 return;
1836         invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr);
1837 }
1838
1839 void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1840                                                 nid_t ino, block_t blkaddr)
1841 {
1842         struct page *cpage;
1843         int ret;
1844
1845         if (!test_opt(sbi, COMPRESS_CACHE))
1846                 return;
1847
1848         if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1849                 return;
1850
1851         if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
1852                 return;
1853
1854         cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
1855         if (cpage) {
1856                 f2fs_put_page(cpage, 0);
1857                 return;
1858         }
1859
1860         cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
1861         if (!cpage)
1862                 return;
1863
1864         ret = add_to_page_cache_lru(cpage, COMPRESS_MAPPING(sbi),
1865                                                 blkaddr, GFP_NOFS);
1866         if (ret) {
1867                 f2fs_put_page(cpage, 0);
1868                 return;
1869         }
1870
1871         set_page_private_data(cpage, ino);
1872
1873         if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
1874                 goto out;
1875
1876         memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
1877         SetPageUptodate(cpage);
1878 out:
1879         f2fs_put_page(cpage, 1);
1880 }
1881
1882 bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
1883                                                                 block_t blkaddr)
1884 {
1885         struct page *cpage;
1886         bool hitted = false;
1887
1888         if (!test_opt(sbi, COMPRESS_CACHE))
1889                 return false;
1890
1891         cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
1892                                 blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
1893         if (cpage) {
1894                 if (PageUptodate(cpage)) {
1895                         atomic_inc(&sbi->compress_page_hit);
1896                         memcpy(page_address(page),
1897                                 page_address(cpage), PAGE_SIZE);
1898                         hitted = true;
1899                 }
1900                 f2fs_put_page(cpage, 1);
1901         }
1902
1903         return hitted;
1904 }
1905
1906 void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
1907 {
1908         struct address_space *mapping = sbi->compress_inode->i_mapping;
1909         struct folio_batch fbatch;
1910         pgoff_t index = 0;
1911         pgoff_t end = MAX_BLKADDR(sbi);
1912
1913         if (!mapping->nrpages)
1914                 return;
1915
1916         folio_batch_init(&fbatch);
1917
1918         do {
1919                 unsigned int nr, i;
1920
1921                 nr = filemap_get_folios(mapping, &index, end - 1, &fbatch);
1922                 if (!nr)
1923                         break;
1924
1925                 for (i = 0; i < nr; i++) {
1926                         struct folio *folio = fbatch.folios[i];
1927
1928                         folio_lock(folio);
1929                         if (folio->mapping != mapping) {
1930                                 folio_unlock(folio);
1931                                 continue;
1932                         }
1933
1934                         if (ino != get_page_private_data(&folio->page)) {
1935                                 folio_unlock(folio);
1936                                 continue;
1937                         }
1938
1939                         generic_error_remove_page(mapping, &folio->page);
1940                         folio_unlock(folio);
1941                 }
1942                 folio_batch_release(&fbatch);
1943                 cond_resched();
1944         } while (index < end);
1945 }
1946
1947 int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
1948 {
1949         struct inode *inode;
1950
1951         if (!test_opt(sbi, COMPRESS_CACHE))
1952                 return 0;
1953
1954         inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
1955         if (IS_ERR(inode))
1956                 return PTR_ERR(inode);
1957         sbi->compress_inode = inode;
1958
1959         sbi->compress_percent = COMPRESS_PERCENT;
1960         sbi->compress_watermark = COMPRESS_WATERMARK;
1961
1962         atomic_set(&sbi->compress_page_hit, 0);
1963
1964         return 0;
1965 }
1966
1967 void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
1968 {
1969         if (!sbi->compress_inode)
1970                 return;
1971         iput(sbi->compress_inode);
1972         sbi->compress_inode = NULL;
1973 }
1974
1975 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1976 {
1977         dev_t dev = sbi->sb->s_bdev->bd_dev;
1978         char slab_name[32];
1979
1980         if (!f2fs_sb_has_compression(sbi))
1981                 return 0;
1982
1983         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1984
1985         sbi->page_array_slab_size = sizeof(struct page *) <<
1986                                         F2FS_OPTION(sbi).compress_log_size;
1987
1988         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1989                                         sbi->page_array_slab_size);
1990         if (!sbi->page_array_slab)
1991                 return -ENOMEM;
1992         return 0;
1993 }
1994
1995 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1996 {
1997         kmem_cache_destroy(sbi->page_array_slab);
1998 }
1999
2000 static int __init f2fs_init_cic_cache(void)
2001 {
2002         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
2003                                         sizeof(struct compress_io_ctx));
2004         if (!cic_entry_slab)
2005                 return -ENOMEM;
2006         return 0;
2007 }
2008
2009 static void f2fs_destroy_cic_cache(void)
2010 {
2011         kmem_cache_destroy(cic_entry_slab);
2012 }
2013
2014 static int __init f2fs_init_dic_cache(void)
2015 {
2016         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
2017                                         sizeof(struct decompress_io_ctx));
2018         if (!dic_entry_slab)
2019                 return -ENOMEM;
2020         return 0;
2021 }
2022
2023 static void f2fs_destroy_dic_cache(void)
2024 {
2025         kmem_cache_destroy(dic_entry_slab);
2026 }
2027
2028 int __init f2fs_init_compress_cache(void)
2029 {
2030         int err;
2031
2032         err = f2fs_init_cic_cache();
2033         if (err)
2034                 goto out;
2035         err = f2fs_init_dic_cache();
2036         if (err)
2037                 goto free_cic;
2038         return 0;
2039 free_cic:
2040         f2fs_destroy_cic_cache();
2041 out:
2042         return -ENOMEM;
2043 }
2044
2045 void f2fs_destroy_compress_cache(void)
2046 {
2047         f2fs_destroy_dic_cache();
2048         f2fs_destroy_cic_cache();
2049 }