fs/f2fs/compress.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * f2fs compress support
   4  *
   5  * Copyright (c) 2019 Chao Yu <chao@kernel.org>
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/writeback.h>
  11 #include <linux/backing-dev.h>
  12 #include <linux/lzo.h>
  13 #include <linux/lz4.h>
  14 #include <linux/zstd.h>
  15
  16 #include "f2fs.h"
  17 #include "node.h"
  18 #include <trace/events/f2fs.h>
  19
  20 struct f2fs_compress_ops {
  21         int (*init_compress_ctx)(struct compress_ctx *cc);
  22         void (*destroy_compress_ctx)(struct compress_ctx *cc);
  23         int (*compress_pages)(struct compress_ctx *cc);
  24         int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
  25         void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
  26         int (*decompress_pages)(struct decompress_io_ctx *dic);
  27 };
  28
  29 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
  30 {
  31         return index & (cc->cluster_size - 1);
  32 }
  33
  34 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
  35 {
  36         return index >> cc->log_cluster_size;
  37 }
  38
  39 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
  40 {
  41         return cc->cluster_idx << cc->log_cluster_size;
  42 }
  43
  44 bool f2fs_is_compressed_page(struct page *page)
  45 {
  46         if (!PagePrivate(page))
  47                 return false;
  48         if (!page_private(page))
  49                 return false;
  50         if (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
  51                 return false;
  52         /*
  53          * page->private may be set with pid.
  54          * pid_max is enough to check if it is traced.
  55          */
  56         if (IS_IO_TRACED_PAGE(page))
  57                 return false;
  58
  59         f2fs_bug_on(F2FS_M_SB(page->mapping),
  60                 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
  61         return true;
  62 }
  63
  64 static void f2fs_set_compressed_page(struct page *page,
  65                 struct inode *inode, pgoff_t index, void *data)
  66 {
  67         SetPagePrivate(page);
  68         set_page_private(page, (unsigned long)data);
  69
  70         /* i_crypto_info and iv index */
  71         page->index = index;
  72         page->mapping = inode->i_mapping;
  73 }
  74
  75 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
  76 {
  77         int i;
  78
  79         for (i = 0; i < len; i++) {
  80                 if (!cc->rpages[i])
  81                         continue;
  82                 if (unlock)
  83                         unlock_page(cc->rpages[i]);
  84                 else
  85                         put_page(cc->rpages[i]);
  86         }
  87 }
  88
  89 static void f2fs_put_rpages(struct compress_ctx *cc)
  90 {
  91         f2fs_drop_rpages(cc, cc->cluster_size, false);
  92 }
  93
  94 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
  95 {
  96         f2fs_drop_rpages(cc, len, true);
  97 }
  98
  99 static void f2fs_put_rpages_mapping(struct address_space *mapping,
 100                                 pgoff_t start, int len)
 101 {
 102         int i;
 103
 104         for (i = 0; i < len; i++) {
 105                 struct page *page = find_get_page(mapping, start + i);
 106
 107                 put_page(page);
 108                 put_page(page);
 109         }
 110 }
 111
 112 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 113                 struct writeback_control *wbc, bool redirty, int unlock)
 114 {
 115         unsigned int i;
 116
 117         for (i = 0; i < cc->cluster_size; i++) {
 118                 if (!cc->rpages[i])
 119                         continue;
 120                 if (redirty)
 121                         redirty_page_for_writepage(wbc, cc->rpages[i]);
 122                 f2fs_put_page(cc->rpages[i], unlock);
 123         }
 124 }
 125
 126 struct page *f2fs_compress_control_page(struct page *page)
 127 {
 128         return ((struct compress_io_ctx *)page_private(page))->rpages[0];
 129 }
 130
 131 int f2fs_init_compress_ctx(struct compress_ctx *cc)
 132 {
 133         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 134
 135         if (cc->nr_rpages)
 136                 return 0;
 137
 138         cc->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
 139                                         cc->log_cluster_size, GFP_NOFS);
 140         return cc->rpages ? 0 : -ENOMEM;
 141 }
 142
 143 void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
 144 {
 145         kfree(cc->rpages);
 146         cc->rpages = NULL;
 147         cc->nr_rpages = 0;
 148         cc->nr_cpages = 0;
 149         cc->cluster_idx = NULL_CLUSTER;
 150 }
 151
 152 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 153 {
 154         unsigned int cluster_ofs;
 155
 156         if (!f2fs_cluster_can_merge_page(cc, page->index))
 157                 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 158
 159         cluster_ofs = offset_in_cluster(cc, page->index);
 160         cc->rpages[cluster_ofs] = page;
 161         cc->nr_rpages++;
 162         cc->cluster_idx = cluster_idx(cc, page->index);
 163 }
 164
 165 #ifdef CONFIG_F2FS_FS_LZO
 166 static int lzo_init_compress_ctx(struct compress_ctx *cc)
 167 {
 168         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 169                                 LZO1X_MEM_COMPRESS, GFP_NOFS);
 170         if (!cc->private)
 171                 return -ENOMEM;
 172
 173         cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 174         return 0;
 175 }
 176
 177 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 178 {
 179         kvfree(cc->private);
 180         cc->private = NULL;
 181 }
 182
 183 static int lzo_compress_pages(struct compress_ctx *cc)
 184 {
 185         int ret;
 186
 187         ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 188                                         &cc->clen, cc->private);
 189         if (ret != LZO_E_OK) {
 190                 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
 191                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 192                 return -EIO;
 193         }
 194         return 0;
 195 }
 196
 197 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 198 {
 199         int ret;
 200
 201         ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 202                                                 dic->rbuf, &dic->rlen);
 203         if (ret != LZO_E_OK) {
 204                 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
 205                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 206                 return -EIO;
 207         }
 208
 209         if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 210                 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
 211                                         "expected:%lu\n", KERN_ERR,
 212                                         F2FS_I_SB(dic->inode)->sb->s_id,
 213                                         dic->rlen,
 214                                         PAGE_SIZE << dic->log_cluster_size);
 215                 return -EIO;
 216         }
 217         return 0;
 218 }
 219
 220 static const struct f2fs_compress_ops f2fs_lzo_ops = {
 221         .init_compress_ctx      = lzo_init_compress_ctx,
 222         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 223         .compress_pages         = lzo_compress_pages,
 224         .decompress_pages       = lzo_decompress_pages,
 225 };
 226 #endif
 227
 228 #ifdef CONFIG_F2FS_FS_LZ4
 229 static int lz4_init_compress_ctx(struct compress_ctx *cc)
 230 {
 231         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 232                                 LZ4_MEM_COMPRESS, GFP_NOFS);
 233         if (!cc->private)
 234                 return -ENOMEM;
 235
 236         /*
 237          * we do not change cc->clen to LZ4_compressBound(inputsize) to
 238          * adapt worst compress case, because lz4 compressor can handle
 239          * output budget properly.
 240          */
 241         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 242         return 0;
 243 }
 244
 245 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 246 {
 247         kvfree(cc->private);
 248         cc->private = NULL;
 249 }
 250
 251 static int lz4_compress_pages(struct compress_ctx *cc)
 252 {
 253         int len;
 254
 255         len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 256                                                 cc->clen, cc->private);
 257         if (!len)
 258                 return -EAGAIN;
 259
 260         cc->clen = len;
 261         return 0;
 262 }
 263
 264 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 265 {
 266         int ret;
 267
 268         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 269                                                 dic->clen, dic->rlen);
 270         if (ret < 0) {
 271                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 272                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 273                 return -EIO;
 274         }
 275
 276         if (ret != PAGE_SIZE << dic->log_cluster_size) {
 277                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
 278                                         "expected:%lu\n", KERN_ERR,
 279                                         F2FS_I_SB(dic->inode)->sb->s_id,
 280                                         dic->rlen,
 281                                         PAGE_SIZE << dic->log_cluster_size);
 282                 return -EIO;
 283         }
 284         return 0;
 285 }
 286
 287 static const struct f2fs_compress_ops f2fs_lz4_ops = {
 288         .init_compress_ctx      = lz4_init_compress_ctx,
 289         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 290         .compress_pages         = lz4_compress_pages,
 291         .decompress_pages       = lz4_decompress_pages,
 292 };
 293 #endif
 294
 295 #ifdef CONFIG_F2FS_FS_ZSTD
 296 #define F2FS_ZSTD_DEFAULT_CLEVEL        1
 297
 298 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 299 {
 300         ZSTD_parameters params;
 301         ZSTD_CStream *stream;
 302         void *workspace;
 303         unsigned int workspace_size;
 304
 305         params = ZSTD_getParams(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen, 0);
 306         workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
 307
 308         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 309                                         workspace_size, GFP_NOFS);
 310         if (!workspace)
 311                 return -ENOMEM;
 312
 313         stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
 314         if (!stream) {
 315                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
 316                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 317                                 __func__);
 318                 kvfree(workspace);
 319                 return -EIO;
 320         }
 321
 322         cc->private = workspace;
 323         cc->private2 = stream;
 324
 325         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 326         return 0;
 327 }
 328
 329 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 330 {
 331         kvfree(cc->private);
 332         cc->private = NULL;
 333         cc->private2 = NULL;
 334 }
 335
 336 static int zstd_compress_pages(struct compress_ctx *cc)
 337 {
 338         ZSTD_CStream *stream = cc->private2;
 339         ZSTD_inBuffer inbuf;
 340         ZSTD_outBuffer outbuf;
 341         int src_size = cc->rlen;
 342         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 343         int ret;
 344
 345         inbuf.pos = 0;
 346         inbuf.src = cc->rbuf;
 347         inbuf.size = src_size;
 348
 349         outbuf.pos = 0;
 350         outbuf.dst = cc->cbuf->cdata;
 351         outbuf.size = dst_size;
 352
 353         ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
 354         if (ZSTD_isError(ret)) {
 355                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 356                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 357                                 __func__, ZSTD_getErrorCode(ret));
 358                 return -EIO;
 359         }
 360
 361         ret = ZSTD_endStream(stream, &outbuf);
 362         if (ZSTD_isError(ret)) {
 363                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
 364                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 365                                 __func__, ZSTD_getErrorCode(ret));
 366                 return -EIO;
 367         }
 368
 369         /*
 370          * there is compressed data remained in intermediate buffer due to
 371          * no more space in cbuf.cdata
 372          */
 373         if (ret)
 374                 return -EAGAIN;
 375
 376         cc->clen = outbuf.pos;
 377         return 0;
 378 }
 379
 380 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 381 {
 382         ZSTD_DStream *stream;
 383         void *workspace;
 384         unsigned int workspace_size;
 385
 386         workspace_size = ZSTD_DStreamWorkspaceBound(MAX_COMPRESS_WINDOW_SIZE);
 387
 388         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 389                                         workspace_size, GFP_NOFS);
 390         if (!workspace)
 391                 return -ENOMEM;
 392
 393         stream = ZSTD_initDStream(MAX_COMPRESS_WINDOW_SIZE,
 394                                         workspace, workspace_size);
 395         if (!stream) {
 396                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
 397                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 398                                 __func__);
 399                 kvfree(workspace);
 400                 return -EIO;
 401         }
 402
 403         dic->private = workspace;
 404         dic->private2 = stream;
 405
 406         return 0;
 407 }
 408
 409 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 410 {
 411         kvfree(dic->private);
 412         dic->private = NULL;
 413         dic->private2 = NULL;
 414 }
 415
 416 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 417 {
 418         ZSTD_DStream *stream = dic->private2;
 419         ZSTD_inBuffer inbuf;
 420         ZSTD_outBuffer outbuf;
 421         int ret;
 422
 423         inbuf.pos = 0;
 424         inbuf.src = dic->cbuf->cdata;
 425         inbuf.size = dic->clen;
 426
 427         outbuf.pos = 0;
 428         outbuf.dst = dic->rbuf;
 429         outbuf.size = dic->rlen;
 430
 431         ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
 432         if (ZSTD_isError(ret)) {
 433                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 434                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 435                                 __func__, ZSTD_getErrorCode(ret));
 436                 return -EIO;
 437         }
 438
 439         if (dic->rlen != outbuf.pos) {
 440                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 441                                 "expected:%lu\n", KERN_ERR,
 442                                 F2FS_I_SB(dic->inode)->sb->s_id,
 443                                 __func__, dic->rlen,
 444                                 PAGE_SIZE << dic->log_cluster_size);
 445                 return -EIO;
 446         }
 447
 448         return 0;
 449 }
 450
 451 static const struct f2fs_compress_ops f2fs_zstd_ops = {
 452         .init_compress_ctx      = zstd_init_compress_ctx,
 453         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 454         .compress_pages         = zstd_compress_pages,
 455         .init_decompress_ctx    = zstd_init_decompress_ctx,
 456         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 457         .decompress_pages       = zstd_decompress_pages,
 458 };
 459 #endif
 460
 461 #ifdef CONFIG_F2FS_FS_LZO
 462 #ifdef CONFIG_F2FS_FS_LZORLE
 463 static int lzorle_compress_pages(struct compress_ctx *cc)
 464 {
 465         int ret;
 466
 467         ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 468                                         &cc->clen, cc->private);
 469         if (ret != LZO_E_OK) {
 470                 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
 471                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 472                 return -EIO;
 473         }
 474         return 0;
 475 }
 476
 477 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 478         .init_compress_ctx      = lzo_init_compress_ctx,
 479         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 480         .compress_pages         = lzorle_compress_pages,
 481         .decompress_pages       = lzo_decompress_pages,
 482 };
 483 #endif
 484 #endif
 485
 486 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 487 #ifdef CONFIG_F2FS_FS_LZO
 488         &f2fs_lzo_ops,
 489 #else
 490         NULL,
 491 #endif
 492 #ifdef CONFIG_F2FS_FS_LZ4
 493         &f2fs_lz4_ops,
 494 #else
 495         NULL,
 496 #endif
 497 #ifdef CONFIG_F2FS_FS_ZSTD
 498         &f2fs_zstd_ops,
 499 #else
 500         NULL,
 501 #endif
 502 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 503         &f2fs_lzorle_ops,
 504 #else
 505         NULL,
 506 #endif
 507 };
 508
 509 bool f2fs_is_compress_backend_ready(struct inode *inode)
 510 {
 511         if (!f2fs_compressed_file(inode))
 512                 return true;
 513         return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 514 }
 515
 516 static mempool_t *compress_page_pool;
 517 static int num_compress_pages = 512;
 518 module_param(num_compress_pages, uint, 0444);
 519 MODULE_PARM_DESC(num_compress_pages,
 520                 "Number of intermediate compress pages to preallocate");
 521
 522 int f2fs_init_compress_mempool(void)
 523 {
 524         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 525         if (!compress_page_pool)
 526                 return -ENOMEM;
 527
 528         return 0;
 529 }
 530
 531 void f2fs_destroy_compress_mempool(void)
 532 {
 533         mempool_destroy(compress_page_pool);
 534 }
 535
 536 static struct page *f2fs_compress_alloc_page(void)
 537 {
 538         struct page *page;
 539
 540         page = mempool_alloc(compress_page_pool, GFP_NOFS);
 541         lock_page(page);
 542
 543         return page;
 544 }
 545
 546 static void f2fs_compress_free_page(struct page *page)
 547 {
 548         if (!page)
 549                 return;
 550         set_page_private(page, (unsigned long)NULL);
 551         ClearPagePrivate(page);
 552         page->mapping = NULL;
 553         unlock_page(page);
 554         mempool_free(page, compress_page_pool);
 555 }
 556
 557 static int f2fs_compress_pages(struct compress_ctx *cc)
 558 {
 559         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 560         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 561         const struct f2fs_compress_ops *cops =
 562                                 f2fs_cops[fi->i_compress_algorithm];
 563         unsigned int max_len, nr_cpages;
 564         int i, ret;
 565
 566         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 567                                 cc->cluster_size, fi->i_compress_algorithm);
 568
 569         if (cops->init_compress_ctx) {
 570                 ret = cops->init_compress_ctx(cc);
 571                 if (ret)
 572                         goto out;
 573         }
 574
 575         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 576         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 577
 578         cc->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
 579                                         cc->nr_cpages, GFP_NOFS);
 580         if (!cc->cpages) {
 581                 ret = -ENOMEM;
 582                 goto destroy_compress_ctx;
 583         }
 584
 585         for (i = 0; i < cc->nr_cpages; i++) {
 586                 cc->cpages[i] = f2fs_compress_alloc_page();
 587                 if (!cc->cpages[i]) {
 588                         ret = -ENOMEM;
 589                         goto out_free_cpages;
 590                 }
 591         }
 592
 593         cc->rbuf = vmap(cc->rpages, cc->cluster_size, VM_MAP, PAGE_KERNEL_RO);
 594         if (!cc->rbuf) {
 595                 ret = -ENOMEM;
 596                 goto out_free_cpages;
 597         }
 598
 599         cc->cbuf = vmap(cc->cpages, cc->nr_cpages, VM_MAP, PAGE_KERNEL);
 600         if (!cc->cbuf) {
 601                 ret = -ENOMEM;
 602                 goto out_vunmap_rbuf;
 603         }
 604
 605         ret = cops->compress_pages(cc);
 606         if (ret)
 607                 goto out_vunmap_cbuf;
 608
 609         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 610
 611         if (cc->clen > max_len) {
 612                 ret = -EAGAIN;
 613                 goto out_vunmap_cbuf;
 614         }
 615
 616         cc->cbuf->clen = cpu_to_le32(cc->clen);
 617
 618         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 619                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 620
 621         nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 622
 623         /* zero out any unused part of the last page */
 624         memset(&cc->cbuf->cdata[cc->clen], 0,
 625                (nr_cpages * PAGE_SIZE) - (cc->clen + COMPRESS_HEADER_SIZE));
 626
 627         vunmap(cc->cbuf);
 628         vunmap(cc->rbuf);
 629
 630         for (i = nr_cpages; i < cc->nr_cpages; i++) {
 631                 f2fs_compress_free_page(cc->cpages[i]);
 632                 cc->cpages[i] = NULL;
 633         }
 634
 635         if (cops->destroy_compress_ctx)
 636                 cops->destroy_compress_ctx(cc);
 637
 638         cc->nr_cpages = nr_cpages;
 639
 640         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 641                                                         cc->clen, ret);
 642         return 0;
 643
 644 out_vunmap_cbuf:
 645         vunmap(cc->cbuf);
 646 out_vunmap_rbuf:
 647         vunmap(cc->rbuf);
 648 out_free_cpages:
 649         for (i = 0; i < cc->nr_cpages; i++) {
 650                 if (cc->cpages[i])
 651                         f2fs_compress_free_page(cc->cpages[i]);
 652         }
 653         kfree(cc->cpages);
 654         cc->cpages = NULL;
 655 destroy_compress_ctx:
 656         if (cops->destroy_compress_ctx)
 657                 cops->destroy_compress_ctx(cc);
 658 out:
 659         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 660                                                         cc->clen, ret);
 661         return ret;
 662 }
 663
 664 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 665 {
 666         struct decompress_io_ctx *dic =
 667                         (struct decompress_io_ctx *)page_private(page);
 668         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 669         struct f2fs_inode_info *fi= F2FS_I(dic->inode);
 670         const struct f2fs_compress_ops *cops =
 671                         f2fs_cops[fi->i_compress_algorithm];
 672         int ret;
 673         int i;
 674
 675         dec_page_count(sbi, F2FS_RD_DATA);
 676
 677         if (bio->bi_status || PageError(page))
 678                 dic->failed = true;
 679
 680         if (refcount_dec_not_one(&dic->ref))
 681                 return;
 682
 683         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 684                                 dic->cluster_size, fi->i_compress_algorithm);
 685
 686         /* submit partial compressed pages */
 687         if (dic->failed) {
 688                 ret = -EIO;
 689                 goto out_free_dic;
 690         }
 691
 692         dic->tpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
 693                                         dic->cluster_size, GFP_NOFS);
 694         if (!dic->tpages) {
 695                 ret = -ENOMEM;
 696                 goto out_free_dic;
 697         }
 698
 699         for (i = 0; i < dic->cluster_size; i++) {
 700                 if (dic->rpages[i]) {
 701                         dic->tpages[i] = dic->rpages[i];
 702                         continue;
 703                 }
 704
 705                 dic->tpages[i] = f2fs_compress_alloc_page();
 706                 if (!dic->tpages[i]) {
 707                         ret = -ENOMEM;
 708                         goto out_free_dic;
 709                 }
 710         }
 711
 712         if (cops->init_decompress_ctx) {
 713                 ret = cops->init_decompress_ctx(dic);
 714                 if (ret)
 715                         goto out_free_dic;
 716         }
 717
 718         dic->rbuf = vmap(dic->tpages, dic->cluster_size, VM_MAP, PAGE_KERNEL);
 719         if (!dic->rbuf) {
 720                 ret = -ENOMEM;
 721                 goto destroy_decompress_ctx;
 722         }
 723
 724         dic->cbuf = vmap(dic->cpages, dic->nr_cpages, VM_MAP, PAGE_KERNEL_RO);
 725         if (!dic->cbuf) {
 726                 ret = -ENOMEM;
 727                 goto out_vunmap_rbuf;
 728         }
 729
 730         dic->clen = le32_to_cpu(dic->cbuf->clen);
 731         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 732
 733         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 734                 ret = -EFSCORRUPTED;
 735                 goto out_vunmap_cbuf;
 736         }
 737
 738         ret = cops->decompress_pages(dic);
 739
 740 out_vunmap_cbuf:
 741         vunmap(dic->cbuf);
 742 out_vunmap_rbuf:
 743         vunmap(dic->rbuf);
 744 destroy_decompress_ctx:
 745         if (cops->destroy_decompress_ctx)
 746                 cops->destroy_decompress_ctx(dic);
 747 out_free_dic:
 748         if (verity)
 749                 refcount_set(&dic->ref, dic->nr_cpages);
 750         if (!verity)
 751                 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
 752                                                                 ret, false);
 753
 754         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 755                                                         dic->clen, ret);
 756         if (!verity)
 757                 f2fs_free_dic(dic);
 758 }
 759
 760 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 761 {
 762         if (cc->cluster_idx == NULL_CLUSTER)
 763                 return true;
 764         return cc->cluster_idx == cluster_idx(cc, index);
 765 }
 766
 767 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 768 {
 769         return cc->nr_rpages == 0;
 770 }
 771
 772 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 773 {
 774         return cc->cluster_size == cc->nr_rpages;
 775 }
 776
 777 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 778 {
 779         if (f2fs_cluster_is_empty(cc))
 780                 return true;
 781         return is_page_in_cluster(cc, index);
 782 }
 783
 784 static bool __cluster_may_compress(struct compress_ctx *cc)
 785 {
 786         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 787         loff_t i_size = i_size_read(cc->inode);
 788         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 789         int i;
 790
 791         for (i = 0; i < cc->cluster_size; i++) {
 792                 struct page *page = cc->rpages[i];
 793
 794                 f2fs_bug_on(sbi, !page);
 795
 796                 if (unlikely(f2fs_cp_error(sbi)))
 797                         return false;
 798                 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 799                         return false;
 800
 801                 /* beyond EOF */
 802                 if (page->index >= nr_pages)
 803                         return false;
 804         }
 805         return true;
 806 }
 807
 808 static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
 809 {
 810         struct dnode_of_data dn;
 811         int ret;
 812
 813         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
 814         ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
 815                                                         LOOKUP_NODE);
 816         if (ret) {
 817                 if (ret == -ENOENT)
 818                         ret = 0;
 819                 goto fail;
 820         }
 821
 822         if (dn.data_blkaddr == COMPRESS_ADDR) {
 823                 int i;
 824
 825                 ret = 1;
 826                 for (i = 1; i < cc->cluster_size; i++) {
 827                         block_t blkaddr;
 828
 829                         blkaddr = data_blkaddr(dn.inode,
 830                                         dn.node_page, dn.ofs_in_node + i);
 831                         if (compr) {
 832                                 if (__is_valid_data_blkaddr(blkaddr))
 833                                         ret++;
 834                         } else {
 835                                 if (blkaddr != NULL_ADDR)
 836                                         ret++;
 837                         }
 838                 }
 839         }
 840 fail:
 841         f2fs_put_dnode(&dn);
 842         return ret;
 843 }
 844
 845 /* return # of compressed blocks in compressed cluster */
 846 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 847 {
 848         return __f2fs_cluster_blocks(cc, true);
 849 }
 850
 851 /* return # of valid blocks in compressed cluster */
 852 static int f2fs_cluster_blocks(struct compress_ctx *cc)
 853 {
 854         return __f2fs_cluster_blocks(cc, false);
 855 }
 856
 857 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 858 {
 859         struct compress_ctx cc = {
 860                 .inode = inode,
 861                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
 862                 .cluster_size = F2FS_I(inode)->i_cluster_size,
 863                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
 864         };
 865
 866         return f2fs_cluster_blocks(&cc);
 867 }
 868
 869 static bool cluster_may_compress(struct compress_ctx *cc)
 870 {
 871         if (!f2fs_compressed_file(cc->inode))
 872                 return false;
 873         if (f2fs_is_atomic_file(cc->inode))
 874                 return false;
 875         if (f2fs_is_mmap_file(cc->inode))
 876                 return false;
 877         if (!f2fs_cluster_is_full(cc))
 878                 return false;
 879         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
 880                 return false;
 881         return __cluster_may_compress(cc);
 882 }
 883
 884 static void set_cluster_writeback(struct compress_ctx *cc)
 885 {
 886         int i;
 887
 888         for (i = 0; i < cc->cluster_size; i++) {
 889                 if (cc->rpages[i])
 890                         set_page_writeback(cc->rpages[i]);
 891         }
 892 }
 893
 894 static void set_cluster_dirty(struct compress_ctx *cc)
 895 {
 896         int i;
 897
 898         for (i = 0; i < cc->cluster_size; i++)
 899                 if (cc->rpages[i])
 900                         set_page_dirty(cc->rpages[i]);
 901 }
 902
 903 static int prepare_compress_overwrite(struct compress_ctx *cc,
 904                 struct page **pagep, pgoff_t index, void **fsdata)
 905 {
 906         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 907         struct address_space *mapping = cc->inode->i_mapping;
 908         struct page *page;
 909         struct dnode_of_data dn;
 910         sector_t last_block_in_bio;
 911         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
 912         pgoff_t start_idx = start_idx_of_cluster(cc);
 913         int i, ret;
 914         bool prealloc;
 915
 916 retry:
 917         ret = f2fs_cluster_blocks(cc);
 918         if (ret <= 0)
 919                 return ret;
 920
 921         /* compressed case */
 922         prealloc = (ret < cc->cluster_size);
 923
 924         ret = f2fs_init_compress_ctx(cc);
 925         if (ret)
 926                 return ret;
 927
 928         /* keep page reference to avoid page reclaim */
 929         for (i = 0; i < cc->cluster_size; i++) {
 930                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
 931                                                         fgp_flag, GFP_NOFS);
 932                 if (!page) {
 933                         ret = -ENOMEM;
 934                         goto unlock_pages;
 935                 }
 936
 937                 if (PageUptodate(page))
 938                         unlock_page(page);
 939                 else
 940                         f2fs_compress_ctx_add_page(cc, page);
 941         }
 942
 943         if (!f2fs_cluster_is_empty(cc)) {
 944                 struct bio *bio = NULL;
 945
 946                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
 947                                         &last_block_in_bio, false, true);
 948                 f2fs_destroy_compress_ctx(cc);
 949                 if (ret)
 950                         goto release_pages;
 951                 if (bio)
 952                         f2fs_submit_bio(sbi, bio, DATA);
 953
 954                 ret = f2fs_init_compress_ctx(cc);
 955                 if (ret)
 956                         goto release_pages;
 957         }
 958
 959         for (i = 0; i < cc->cluster_size; i++) {
 960                 f2fs_bug_on(sbi, cc->rpages[i]);
 961
 962                 page = find_lock_page(mapping, start_idx + i);
 963                 f2fs_bug_on(sbi, !page);
 964
 965                 f2fs_wait_on_page_writeback(page, DATA, true, true);
 966
 967                 f2fs_compress_ctx_add_page(cc, page);
 968                 f2fs_put_page(page, 0);
 969
 970                 if (!PageUptodate(page)) {
 971                         f2fs_unlock_rpages(cc, i + 1);
 972                         f2fs_put_rpages_mapping(mapping, start_idx,
 973                                         cc->cluster_size);
 974                         f2fs_destroy_compress_ctx(cc);
 975                         goto retry;
 976                 }
 977         }
 978
 979         if (prealloc) {
 980                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
 981
 982                 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
 983
 984                 for (i = cc->cluster_size - 1; i > 0; i--) {
 985                         ret = f2fs_get_block(&dn, start_idx + i);
 986                         if (ret) {
 987                                 i = cc->cluster_size;
 988                                 break;
 989                         }
 990
 991                         if (dn.data_blkaddr != NEW_ADDR)
 992                                 break;
 993                 }
 994
 995                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
 996         }
 997
 998         if (likely(!ret)) {
 999                 *fsdata = cc->rpages;
1000                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1001                 return cc->cluster_size;
1002         }
1003
1004 unlock_pages:
1005         f2fs_unlock_rpages(cc, i);
1006 release_pages:
1007         f2fs_put_rpages_mapping(mapping, start_idx, i);
1008         f2fs_destroy_compress_ctx(cc);
1009         return ret;
1010 }
1011
1012 int f2fs_prepare_compress_overwrite(struct inode *inode,
1013                 struct page **pagep, pgoff_t index, void **fsdata)
1014 {
1015         struct compress_ctx cc = {
1016                 .inode = inode,
1017                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1018                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1019                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1020                 .rpages = NULL,
1021                 .nr_rpages = 0,
1022         };
1023
1024         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1025 }
1026
1027 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1028                                         pgoff_t index, unsigned copied)
1029
1030 {
1031         struct compress_ctx cc = {
1032                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1033                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1034                 .rpages = fsdata,
1035         };
1036         bool first_index = (index == cc.rpages[0]->index);
1037
1038         if (copied)
1039                 set_cluster_dirty(&cc);
1040
1041         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1042         f2fs_destroy_compress_ctx(&cc);
1043
1044         return first_index;
1045 }
1046
1047 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1048 {
1049         void *fsdata = NULL;
1050         struct page *pagep;
1051         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1052         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1053                                                         log_cluster_size;
1054         int err;
1055
1056         err = f2fs_is_compressed_cluster(inode, start_idx);
1057         if (err < 0)
1058                 return err;
1059
1060         /* truncate normal cluster */
1061         if (!err)
1062                 return f2fs_do_truncate_blocks(inode, from, lock);
1063
1064         /* truncate compressed cluster */
1065         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1066                                                 start_idx, &fsdata);
1067
1068         /* should not be a normal cluster */
1069         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1070
1071         if (err <= 0)
1072                 return err;
1073
1074         if (err > 0) {
1075                 struct page **rpages = fsdata;
1076                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1077                 int i;
1078
1079                 for (i = cluster_size - 1; i >= 0; i--) {
1080                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1081
1082                         if (from <= start) {
1083                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1084                         } else {
1085                                 zero_user_segment(rpages[i], from - start,
1086                                                                 PAGE_SIZE);
1087                                 break;
1088                         }
1089                 }
1090
1091                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1092         }
1093         return 0;
1094 }
1095
1096 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1097                                         int *submitted,
1098                                         struct writeback_control *wbc,
1099                                         enum iostat_type io_type)
1100 {
1101         struct inode *inode = cc->inode;
1102         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1103         struct f2fs_inode_info *fi = F2FS_I(inode);
1104         struct f2fs_io_info fio = {
1105                 .sbi = sbi,
1106                 .ino = cc->inode->i_ino,
1107                 .type = DATA,
1108                 .op = REQ_OP_WRITE,
1109                 .op_flags = wbc_to_write_flags(wbc),
1110                 .old_blkaddr = NEW_ADDR,
1111                 .page = NULL,
1112                 .encrypted_page = NULL,
1113                 .compressed_page = NULL,
1114                 .submitted = false,
1115                 .io_type = io_type,
1116                 .io_wbc = wbc,
1117                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1118         };
1119         struct dnode_of_data dn;
1120         struct node_info ni;
1121         struct compress_io_ctx *cic;
1122         pgoff_t start_idx = start_idx_of_cluster(cc);
1123         unsigned int last_index = cc->cluster_size - 1;
1124         loff_t psize;
1125         int i, err;
1126
1127         if (IS_NOQUOTA(inode)) {
1128                 /*
1129                  * We need to wait for node_write to avoid block allocation during
1130                  * checkpoint. This can only happen to quota writes which can cause
1131                  * the below discard race condition.
1132                  */
1133                 down_read(&sbi->node_write);
1134         } else if (!f2fs_trylock_op(sbi)) {
1135                 return -EAGAIN;
1136         }
1137
1138         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1139
1140         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1141         if (err)
1142                 goto out_unlock_op;
1143
1144         for (i = 0; i < cc->cluster_size; i++) {
1145                 if (data_blkaddr(dn.inode, dn.node_page,
1146                                         dn.ofs_in_node + i) == NULL_ADDR)
1147                         goto out_put_dnode;
1148         }
1149
1150         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1151
1152         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1153         if (err)
1154                 goto out_put_dnode;
1155
1156         fio.version = ni.version;
1157
1158         cic = f2fs_kzalloc(sbi, sizeof(struct compress_io_ctx), GFP_NOFS);
1159         if (!cic)
1160                 goto out_put_dnode;
1161
1162         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1163         cic->inode = inode;
1164         refcount_set(&cic->ref, cc->nr_cpages);
1165         cic->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
1166                         cc->log_cluster_size, GFP_NOFS);
1167         if (!cic->rpages)
1168                 goto out_put_cic;
1169
1170         cic->nr_rpages = cc->cluster_size;
1171
1172         for (i = 0; i < cc->nr_cpages; i++) {
1173                 f2fs_set_compressed_page(cc->cpages[i], inode,
1174                                         cc->rpages[i + 1]->index, cic);
1175                 fio.compressed_page = cc->cpages[i];
1176
1177                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1178                                                 dn.ofs_in_node + i + 1);
1179
1180                 /* wait for GCed page writeback via META_MAPPING */
1181                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1182
1183                 if (fio.encrypted) {
1184                         fio.page = cc->rpages[i + 1];
1185                         err = f2fs_encrypt_one_page(&fio);
1186                         if (err)
1187                                 goto out_destroy_crypt;
1188                         cc->cpages[i] = fio.encrypted_page;
1189                 }
1190         }
1191
1192         set_cluster_writeback(cc);
1193
1194         for (i = 0; i < cc->cluster_size; i++)
1195                 cic->rpages[i] = cc->rpages[i];
1196
1197         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1198                 block_t blkaddr;
1199
1200                 blkaddr = f2fs_data_blkaddr(&dn);
1201                 fio.page = cc->rpages[i];
1202                 fio.old_blkaddr = blkaddr;
1203
1204                 /* cluster header */
1205                 if (i == 0) {
1206                         if (blkaddr == COMPRESS_ADDR)
1207                                 fio.compr_blocks++;
1208                         if (__is_valid_data_blkaddr(blkaddr))
1209                                 f2fs_invalidate_blocks(sbi, blkaddr);
1210                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1211                         goto unlock_continue;
1212                 }
1213
1214                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1215                         fio.compr_blocks++;
1216
1217                 if (i > cc->nr_cpages) {
1218                         if (__is_valid_data_blkaddr(blkaddr)) {
1219                                 f2fs_invalidate_blocks(sbi, blkaddr);
1220                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1221                         }
1222                         goto unlock_continue;
1223                 }
1224
1225                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1226
1227                 if (fio.encrypted)
1228                         fio.encrypted_page = cc->cpages[i - 1];
1229                 else
1230                         fio.compressed_page = cc->cpages[i - 1];
1231
1232                 cc->cpages[i - 1] = NULL;
1233                 f2fs_outplace_write_data(&dn, &fio);
1234                 (*submitted)++;
1235 unlock_continue:
1236                 inode_dec_dirty_pages(cc->inode);
1237                 unlock_page(fio.page);
1238         }
1239
1240         if (fio.compr_blocks)
1241                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1242         f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1243
1244         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1245         if (cc->cluster_idx == 0)
1246                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1247
1248         f2fs_put_dnode(&dn);
1249         if (IS_NOQUOTA(inode))
1250                 up_read(&sbi->node_write);
1251         else
1252                 f2fs_unlock_op(sbi);
1253
1254         spin_lock(&fi->i_size_lock);
1255         if (fi->last_disk_size < psize)
1256                 fi->last_disk_size = psize;
1257         spin_unlock(&fi->i_size_lock);
1258
1259         f2fs_put_rpages(cc);
1260         f2fs_destroy_compress_ctx(cc);
1261         return 0;
1262
1263 out_destroy_crypt:
1264         kfree(cic->rpages);
1265
1266         for (--i; i >= 0; i--)
1267                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1268         for (i = 0; i < cc->nr_cpages; i++) {
1269                 if (!cc->cpages[i])
1270                         continue;
1271                 f2fs_put_page(cc->cpages[i], 1);
1272         }
1273 out_put_cic:
1274         kfree(cic);
1275 out_put_dnode:
1276         f2fs_put_dnode(&dn);
1277 out_unlock_op:
1278         if (IS_NOQUOTA(inode))
1279                 up_read(&sbi->node_write);
1280         else
1281                 f2fs_unlock_op(sbi);
1282         return -EAGAIN;
1283 }
1284
1285 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1286 {
1287         struct f2fs_sb_info *sbi = bio->bi_private;
1288         struct compress_io_ctx *cic =
1289                         (struct compress_io_ctx *)page_private(page);
1290         int i;
1291
1292         if (unlikely(bio->bi_status))
1293                 mapping_set_error(cic->inode->i_mapping, -EIO);
1294
1295         f2fs_compress_free_page(page);
1296
1297         dec_page_count(sbi, F2FS_WB_DATA);
1298
1299         if (refcount_dec_not_one(&cic->ref))
1300                 return;
1301
1302         for (i = 0; i < cic->nr_rpages; i++) {
1303                 WARN_ON(!cic->rpages[i]);
1304                 clear_cold_data(cic->rpages[i]);
1305                 end_page_writeback(cic->rpages[i]);
1306         }
1307
1308         kfree(cic->rpages);
1309         kfree(cic);
1310 }
1311
1312 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1313                                         int *submitted,
1314                                         struct writeback_control *wbc,
1315                                         enum iostat_type io_type)
1316 {
1317         struct address_space *mapping = cc->inode->i_mapping;
1318         int _submitted, compr_blocks, ret;
1319         int i = -1, err = 0;
1320
1321         compr_blocks = f2fs_compressed_blocks(cc);
1322         if (compr_blocks < 0) {
1323                 err = compr_blocks;
1324                 goto out_err;
1325         }
1326
1327         for (i = 0; i < cc->cluster_size; i++) {
1328                 if (!cc->rpages[i])
1329                         continue;
1330 retry_write:
1331                 if (cc->rpages[i]->mapping != mapping) {
1332                         unlock_page(cc->rpages[i]);
1333                         continue;
1334                 }
1335
1336                 BUG_ON(!PageLocked(cc->rpages[i]));
1337
1338                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1339                                                 NULL, NULL, wbc, io_type,
1340                                                 compr_blocks);
1341                 if (ret) {
1342                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1343                                 unlock_page(cc->rpages[i]);
1344                                 ret = 0;
1345                         } else if (ret == -EAGAIN) {
1346                                 /*
1347                                  * for quota file, just redirty left pages to
1348                                  * avoid deadlock caused by cluster update race
1349                                  * from foreground operation.
1350                                  */
1351                                 if (IS_NOQUOTA(cc->inode)) {
1352                                         err = 0;
1353                                         goto out_err;
1354                                 }
1355                                 ret = 0;
1356                                 cond_resched();
1357                                 congestion_wait(BLK_RW_ASYNC,
1358                                                 DEFAULT_IO_TIMEOUT);
1359                                 lock_page(cc->rpages[i]);
1360
1361                                 if (!PageDirty(cc->rpages[i])) {
1362                                         unlock_page(cc->rpages[i]);
1363                                         continue;
1364                                 }
1365
1366                                 clear_page_dirty_for_io(cc->rpages[i]);
1367                                 goto retry_write;
1368                         }
1369                         err = ret;
1370                         goto out_err;
1371                 }
1372
1373                 *submitted += _submitted;
1374         }
1375         return 0;
1376 out_err:
1377         for (++i; i < cc->cluster_size; i++) {
1378                 if (!cc->rpages[i])
1379                         continue;
1380                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1381                 unlock_page(cc->rpages[i]);
1382         }
1383         return err;
1384 }
1385
1386 int f2fs_write_multi_pages(struct compress_ctx *cc,
1387                                         int *submitted,
1388                                         struct writeback_control *wbc,
1389                                         enum iostat_type io_type)
1390 {
1391         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
1392         const struct f2fs_compress_ops *cops =
1393                         f2fs_cops[fi->i_compress_algorithm];
1394         int err;
1395
1396         *submitted = 0;
1397         if (cluster_may_compress(cc)) {
1398                 err = f2fs_compress_pages(cc);
1399                 if (err == -EAGAIN) {
1400                         goto write;
1401                 } else if (err) {
1402                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1403                         goto destroy_out;
1404                 }
1405
1406                 err = f2fs_write_compressed_pages(cc, submitted,
1407                                                         wbc, io_type);
1408                 cops->destroy_compress_ctx(cc);
1409                 kfree(cc->cpages);
1410                 cc->cpages = NULL;
1411                 if (!err)
1412                         return 0;
1413                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1414         }
1415 write:
1416         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1417
1418         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1419         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1420 destroy_out:
1421         f2fs_destroy_compress_ctx(cc);
1422         return err;
1423 }
1424
1425 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1426 {
1427         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
1428         struct decompress_io_ctx *dic;
1429         pgoff_t start_idx = start_idx_of_cluster(cc);
1430         int i;
1431
1432         dic = f2fs_kzalloc(sbi, sizeof(struct decompress_io_ctx), GFP_NOFS);
1433         if (!dic)
1434                 return ERR_PTR(-ENOMEM);
1435
1436         dic->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
1437                         cc->log_cluster_size, GFP_NOFS);
1438         if (!dic->rpages) {
1439                 kfree(dic);
1440                 return ERR_PTR(-ENOMEM);
1441         }
1442
1443         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1444         dic->inode = cc->inode;
1445         refcount_set(&dic->ref, cc->nr_cpages);
1446         dic->cluster_idx = cc->cluster_idx;
1447         dic->cluster_size = cc->cluster_size;
1448         dic->log_cluster_size = cc->log_cluster_size;
1449         dic->nr_cpages = cc->nr_cpages;
1450         dic->failed = false;
1451
1452         for (i = 0; i < dic->cluster_size; i++)
1453                 dic->rpages[i] = cc->rpages[i];
1454         dic->nr_rpages = cc->cluster_size;
1455
1456         dic->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
1457                                         dic->nr_cpages, GFP_NOFS);
1458         if (!dic->cpages)
1459                 goto out_free;
1460
1461         for (i = 0; i < dic->nr_cpages; i++) {
1462                 struct page *page;
1463
1464                 page = f2fs_compress_alloc_page();
1465                 if (!page)
1466                         goto out_free;
1467
1468                 f2fs_set_compressed_page(page, cc->inode,
1469                                         start_idx + i + 1, dic);
1470                 dic->cpages[i] = page;
1471         }
1472
1473         return dic;
1474
1475 out_free:
1476         f2fs_free_dic(dic);
1477         return ERR_PTR(-ENOMEM);
1478 }
1479
1480 void f2fs_free_dic(struct decompress_io_ctx *dic)
1481 {
1482         int i;
1483
1484         if (dic->tpages) {
1485                 for (i = 0; i < dic->cluster_size; i++) {
1486                         if (dic->rpages[i])
1487                                 continue;
1488                         if (!dic->tpages[i])
1489                                 continue;
1490                         f2fs_compress_free_page(dic->tpages[i]);
1491                 }
1492                 kfree(dic->tpages);
1493         }
1494
1495         if (dic->cpages) {
1496                 for (i = 0; i < dic->nr_cpages; i++) {
1497                         if (!dic->cpages[i])
1498                                 continue;
1499                         f2fs_compress_free_page(dic->cpages[i]);
1500                 }
1501                 kfree(dic->cpages);
1502         }
1503
1504         kfree(dic->rpages);
1505         kfree(dic);
1506 }
1507
1508 void f2fs_decompress_end_io(struct page **rpages,
1509                         unsigned int cluster_size, bool err, bool verity)
1510 {
1511         int i;
1512
1513         for (i = 0; i < cluster_size; i++) {
1514                 struct page *rpage = rpages[i];
1515
1516                 if (!rpage)
1517                         continue;
1518
1519                 if (err || PageError(rpage))
1520                         goto clear_uptodate;
1521
1522                 if (!verity || fsverity_verify_page(rpage)) {
1523                         SetPageUptodate(rpage);
1524                         goto unlock;
1525                 }
1526 clear_uptodate:
1527                 ClearPageUptodate(rpage);
1528                 ClearPageError(rpage);
1529 unlock:
1530                 unlock_page(rpage);
1531         }
1532 }