fs/f2fs/compress.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * f2fs compress support
   4  *
   5  * Copyright (c) 2019 Chao Yu <chao@kernel.org>
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/writeback.h>
  11 #include <linux/backing-dev.h>
  12 #include <linux/lzo.h>
  13 #include <linux/lz4.h>
  14 #include <linux/zstd.h>
  15
  16 #include "f2fs.h"
  17 #include "node.h"
  18 #include <trace/events/f2fs.h>
  19
  20 static struct kmem_cache *cic_entry_slab;
  21 static struct kmem_cache *dic_entry_slab;
  22
  23 static void *page_array_alloc(struct inode *inode, int nr)
  24 {
  25         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  26         unsigned int size = sizeof(struct page *) * nr;
  27
  28         if (likely(size <= sbi->page_array_slab_size))
  29                 return kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS);
  30         return f2fs_kzalloc(sbi, size, GFP_NOFS);
  31 }
  32
  33 static void page_array_free(struct inode *inode, void *pages, int nr)
  34 {
  35         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  36         unsigned int size = sizeof(struct page *) * nr;
  37
  38         if (!pages)
  39                 return;
  40
  41         if (likely(size <= sbi->page_array_slab_size))
  42                 kmem_cache_free(sbi->page_array_slab, pages);
  43         else
  44                 kfree(pages);
  45 }
  46
  47 struct f2fs_compress_ops {
  48         int (*init_compress_ctx)(struct compress_ctx *cc);
  49         void (*destroy_compress_ctx)(struct compress_ctx *cc);
  50         int (*compress_pages)(struct compress_ctx *cc);
  51         int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
  52         void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
  53         int (*decompress_pages)(struct decompress_io_ctx *dic);
  54 };
  55
  56 static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
  57 {
  58         return index & (cc->cluster_size - 1);
  59 }
  60
  61 static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
  62 {
  63         return index >> cc->log_cluster_size;
  64 }
  65
  66 static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
  67 {
  68         return cc->cluster_idx << cc->log_cluster_size;
  69 }
  70
  71 bool f2fs_is_compressed_page(struct page *page)
  72 {
  73         if (!PagePrivate(page))
  74                 return false;
  75         if (!page_private(page))
  76                 return false;
  77         if (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
  78                 return false;
  79         /*
  80          * page->private may be set with pid.
  81          * pid_max is enough to check if it is traced.
  82          */
  83         if (IS_IO_TRACED_PAGE(page))
  84                 return false;
  85
  86         f2fs_bug_on(F2FS_M_SB(page->mapping),
  87                 *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
  88         return true;
  89 }
  90
  91 static void f2fs_set_compressed_page(struct page *page,
  92                 struct inode *inode, pgoff_t index, void *data)
  93 {
  94         SetPagePrivate(page);
  95         set_page_private(page, (unsigned long)data);
  96
  97         /* i_crypto_info and iv index */
  98         page->index = index;
  99         page->mapping = inode->i_mapping;
 100 }
 101
 102 static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
 103 {
 104         int i;
 105
 106         for (i = 0; i < len; i++) {
 107                 if (!cc->rpages[i])
 108                         continue;
 109                 if (unlock)
 110                         unlock_page(cc->rpages[i]);
 111                 else
 112                         put_page(cc->rpages[i]);
 113         }
 114 }
 115
 116 static void f2fs_put_rpages(struct compress_ctx *cc)
 117 {
 118         f2fs_drop_rpages(cc, cc->cluster_size, false);
 119 }
 120
 121 static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
 122 {
 123         f2fs_drop_rpages(cc, len, true);
 124 }
 125
 126 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 127                 struct writeback_control *wbc, bool redirty, int unlock)
 128 {
 129         unsigned int i;
 130
 131         for (i = 0; i < cc->cluster_size; i++) {
 132                 if (!cc->rpages[i])
 133                         continue;
 134                 if (redirty)
 135                         redirty_page_for_writepage(wbc, cc->rpages[i]);
 136                 f2fs_put_page(cc->rpages[i], unlock);
 137         }
 138 }
 139
 140 struct page *f2fs_compress_control_page(struct page *page)
 141 {
 142         return ((struct compress_io_ctx *)page_private(page))->rpages[0];
 143 }
 144
 145 int f2fs_init_compress_ctx(struct compress_ctx *cc)
 146 {
 147         if (cc->rpages)
 148                 return 0;
 149
 150         cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 151         return cc->rpages ? 0 : -ENOMEM;
 152 }
 153
 154 void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
 155 {
 156         page_array_free(cc->inode, cc->rpages, cc->cluster_size);
 157         cc->rpages = NULL;
 158         cc->nr_rpages = 0;
 159         cc->nr_cpages = 0;
 160         if (!reuse)
 161                 cc->cluster_idx = NULL_CLUSTER;
 162 }
 163
 164 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 165 {
 166         unsigned int cluster_ofs;
 167
 168         if (!f2fs_cluster_can_merge_page(cc, page->index))
 169                 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 170
 171         cluster_ofs = offset_in_cluster(cc, page->index);
 172         cc->rpages[cluster_ofs] = page;
 173         cc->nr_rpages++;
 174         cc->cluster_idx = cluster_idx(cc, page->index);
 175 }
 176
 177 #ifdef CONFIG_F2FS_FS_LZO
 178 static int lzo_init_compress_ctx(struct compress_ctx *cc)
 179 {
 180         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 181                                 LZO1X_MEM_COMPRESS, GFP_NOFS);
 182         if (!cc->private)
 183                 return -ENOMEM;
 184
 185         cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 186         return 0;
 187 }
 188
 189 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 190 {
 191         kvfree(cc->private);
 192         cc->private = NULL;
 193 }
 194
 195 static int lzo_compress_pages(struct compress_ctx *cc)
 196 {
 197         int ret;
 198
 199         ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 200                                         &cc->clen, cc->private);
 201         if (ret != LZO_E_OK) {
 202                 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
 203                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 204                 return -EIO;
 205         }
 206         return 0;
 207 }
 208
 209 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 210 {
 211         int ret;
 212
 213         ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 214                                                 dic->rbuf, &dic->rlen);
 215         if (ret != LZO_E_OK) {
 216                 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
 217                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 218                 return -EIO;
 219         }
 220
 221         if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 222                 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
 223                                         "expected:%lu\n", KERN_ERR,
 224                                         F2FS_I_SB(dic->inode)->sb->s_id,
 225                                         dic->rlen,
 226                                         PAGE_SIZE << dic->log_cluster_size);
 227                 return -EIO;
 228         }
 229         return 0;
 230 }
 231
 232 static const struct f2fs_compress_ops f2fs_lzo_ops = {
 233         .init_compress_ctx      = lzo_init_compress_ctx,
 234         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 235         .compress_pages         = lzo_compress_pages,
 236         .decompress_pages       = lzo_decompress_pages,
 237 };
 238 #endif
 239
 240 #ifdef CONFIG_F2FS_FS_LZ4
 241 static int lz4_init_compress_ctx(struct compress_ctx *cc)
 242 {
 243         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 244                                 LZ4_MEM_COMPRESS, GFP_NOFS);
 245         if (!cc->private)
 246                 return -ENOMEM;
 247
 248         /*
 249          * we do not change cc->clen to LZ4_compressBound(inputsize) to
 250          * adapt worst compress case, because lz4 compressor can handle
 251          * output budget properly.
 252          */
 253         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 254         return 0;
 255 }
 256
 257 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 258 {
 259         kvfree(cc->private);
 260         cc->private = NULL;
 261 }
 262
 263 static int lz4_compress_pages(struct compress_ctx *cc)
 264 {
 265         int len;
 266
 267         len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 268                                                 cc->clen, cc->private);
 269         if (!len)
 270                 return -EAGAIN;
 271
 272         cc->clen = len;
 273         return 0;
 274 }
 275
 276 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 277 {
 278         int ret;
 279
 280         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 281                                                 dic->clen, dic->rlen);
 282         if (ret < 0) {
 283                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 284                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 285                 return -EIO;
 286         }
 287
 288         if (ret != PAGE_SIZE << dic->log_cluster_size) {
 289                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
 290                                         "expected:%lu\n", KERN_ERR,
 291                                         F2FS_I_SB(dic->inode)->sb->s_id, ret,
 292                                         PAGE_SIZE << dic->log_cluster_size);
 293                 return -EIO;
 294         }
 295         return 0;
 296 }
 297
 298 static const struct f2fs_compress_ops f2fs_lz4_ops = {
 299         .init_compress_ctx      = lz4_init_compress_ctx,
 300         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 301         .compress_pages         = lz4_compress_pages,
 302         .decompress_pages       = lz4_decompress_pages,
 303 };
 304 #endif
 305
 306 #ifdef CONFIG_F2FS_FS_ZSTD
 307 #define F2FS_ZSTD_DEFAULT_CLEVEL        1
 308
 309 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 310 {
 311         ZSTD_parameters params;
 312         ZSTD_CStream *stream;
 313         void *workspace;
 314         unsigned int workspace_size;
 315
 316         params = ZSTD_getParams(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen, 0);
 317         workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
 318
 319         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 320                                         workspace_size, GFP_NOFS);
 321         if (!workspace)
 322                 return -ENOMEM;
 323
 324         stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
 325         if (!stream) {
 326                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
 327                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 328                                 __func__);
 329                 kvfree(workspace);
 330                 return -EIO;
 331         }
 332
 333         cc->private = workspace;
 334         cc->private2 = stream;
 335
 336         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 337         return 0;
 338 }
 339
 340 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 341 {
 342         kvfree(cc->private);
 343         cc->private = NULL;
 344         cc->private2 = NULL;
 345 }
 346
 347 static int zstd_compress_pages(struct compress_ctx *cc)
 348 {
 349         ZSTD_CStream *stream = cc->private2;
 350         ZSTD_inBuffer inbuf;
 351         ZSTD_outBuffer outbuf;
 352         int src_size = cc->rlen;
 353         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 354         int ret;
 355
 356         inbuf.pos = 0;
 357         inbuf.src = cc->rbuf;
 358         inbuf.size = src_size;
 359
 360         outbuf.pos = 0;
 361         outbuf.dst = cc->cbuf->cdata;
 362         outbuf.size = dst_size;
 363
 364         ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
 365         if (ZSTD_isError(ret)) {
 366                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 367                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 368                                 __func__, ZSTD_getErrorCode(ret));
 369                 return -EIO;
 370         }
 371
 372         ret = ZSTD_endStream(stream, &outbuf);
 373         if (ZSTD_isError(ret)) {
 374                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
 375                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 376                                 __func__, ZSTD_getErrorCode(ret));
 377                 return -EIO;
 378         }
 379
 380         /*
 381          * there is compressed data remained in intermediate buffer due to
 382          * no more space in cbuf.cdata
 383          */
 384         if (ret)
 385                 return -EAGAIN;
 386
 387         cc->clen = outbuf.pos;
 388         return 0;
 389 }
 390
 391 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 392 {
 393         ZSTD_DStream *stream;
 394         void *workspace;
 395         unsigned int workspace_size;
 396         unsigned int max_window_size =
 397                         MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 398
 399         workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
 400
 401         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 402                                         workspace_size, GFP_NOFS);
 403         if (!workspace)
 404                 return -ENOMEM;
 405
 406         stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
 407         if (!stream) {
 408                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
 409                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 410                                 __func__);
 411                 kvfree(workspace);
 412                 return -EIO;
 413         }
 414
 415         dic->private = workspace;
 416         dic->private2 = stream;
 417
 418         return 0;
 419 }
 420
 421 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 422 {
 423         kvfree(dic->private);
 424         dic->private = NULL;
 425         dic->private2 = NULL;
 426 }
 427
 428 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 429 {
 430         ZSTD_DStream *stream = dic->private2;
 431         ZSTD_inBuffer inbuf;
 432         ZSTD_outBuffer outbuf;
 433         int ret;
 434
 435         inbuf.pos = 0;
 436         inbuf.src = dic->cbuf->cdata;
 437         inbuf.size = dic->clen;
 438
 439         outbuf.pos = 0;
 440         outbuf.dst = dic->rbuf;
 441         outbuf.size = dic->rlen;
 442
 443         ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
 444         if (ZSTD_isError(ret)) {
 445                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 446                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 447                                 __func__, ZSTD_getErrorCode(ret));
 448                 return -EIO;
 449         }
 450
 451         if (dic->rlen != outbuf.pos) {
 452                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 453                                 "expected:%lu\n", KERN_ERR,
 454                                 F2FS_I_SB(dic->inode)->sb->s_id,
 455                                 __func__, dic->rlen,
 456                                 PAGE_SIZE << dic->log_cluster_size);
 457                 return -EIO;
 458         }
 459
 460         return 0;
 461 }
 462
 463 static const struct f2fs_compress_ops f2fs_zstd_ops = {
 464         .init_compress_ctx      = zstd_init_compress_ctx,
 465         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 466         .compress_pages         = zstd_compress_pages,
 467         .init_decompress_ctx    = zstd_init_decompress_ctx,
 468         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 469         .decompress_pages       = zstd_decompress_pages,
 470 };
 471 #endif
 472
 473 #ifdef CONFIG_F2FS_FS_LZO
 474 #ifdef CONFIG_F2FS_FS_LZORLE
 475 static int lzorle_compress_pages(struct compress_ctx *cc)
 476 {
 477         int ret;
 478
 479         ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 480                                         &cc->clen, cc->private);
 481         if (ret != LZO_E_OK) {
 482                 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
 483                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 484                 return -EIO;
 485         }
 486         return 0;
 487 }
 488
 489 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 490         .init_compress_ctx      = lzo_init_compress_ctx,
 491         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 492         .compress_pages         = lzorle_compress_pages,
 493         .decompress_pages       = lzo_decompress_pages,
 494 };
 495 #endif
 496 #endif
 497
 498 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 499 #ifdef CONFIG_F2FS_FS_LZO
 500         &f2fs_lzo_ops,
 501 #else
 502         NULL,
 503 #endif
 504 #ifdef CONFIG_F2FS_FS_LZ4
 505         &f2fs_lz4_ops,
 506 #else
 507         NULL,
 508 #endif
 509 #ifdef CONFIG_F2FS_FS_ZSTD
 510         &f2fs_zstd_ops,
 511 #else
 512         NULL,
 513 #endif
 514 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 515         &f2fs_lzorle_ops,
 516 #else
 517         NULL,
 518 #endif
 519 };
 520
 521 bool f2fs_is_compress_backend_ready(struct inode *inode)
 522 {
 523         if (!f2fs_compressed_file(inode))
 524                 return true;
 525         return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 526 }
 527
 528 static mempool_t *compress_page_pool;
 529 static int num_compress_pages = 512;
 530 module_param(num_compress_pages, uint, 0444);
 531 MODULE_PARM_DESC(num_compress_pages,
 532                 "Number of intermediate compress pages to preallocate");
 533
 534 int f2fs_init_compress_mempool(void)
 535 {
 536         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 537         if (!compress_page_pool)
 538                 return -ENOMEM;
 539
 540         return 0;
 541 }
 542
 543 void f2fs_destroy_compress_mempool(void)
 544 {
 545         mempool_destroy(compress_page_pool);
 546 }
 547
 548 static struct page *f2fs_compress_alloc_page(void)
 549 {
 550         struct page *page;
 551
 552         page = mempool_alloc(compress_page_pool, GFP_NOFS);
 553         lock_page(page);
 554
 555         return page;
 556 }
 557
 558 static void f2fs_compress_free_page(struct page *page)
 559 {
 560         if (!page)
 561                 return;
 562         set_page_private(page, (unsigned long)NULL);
 563         ClearPagePrivate(page);
 564         page->mapping = NULL;
 565         unlock_page(page);
 566         mempool_free(page, compress_page_pool);
 567 }
 568
 569 #define MAX_VMAP_RETRIES        3
 570
 571 static void *f2fs_vmap(struct page **pages, unsigned int count)
 572 {
 573         int i;
 574         void *buf = NULL;
 575
 576         for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 577                 buf = vm_map_ram(pages, count, -1);
 578                 if (buf)
 579                         break;
 580                 vm_unmap_aliases();
 581         }
 582         return buf;
 583 }
 584
 585 static int f2fs_compress_pages(struct compress_ctx *cc)
 586 {
 587         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 588         const struct f2fs_compress_ops *cops =
 589                                 f2fs_cops[fi->i_compress_algorithm];
 590         unsigned int max_len, new_nr_cpages;
 591         struct page **new_cpages;
 592         u32 chksum = 0;
 593         int i, ret;
 594
 595         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 596                                 cc->cluster_size, fi->i_compress_algorithm);
 597
 598         if (cops->init_compress_ctx) {
 599                 ret = cops->init_compress_ctx(cc);
 600                 if (ret)
 601                         goto out;
 602         }
 603
 604         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 605         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 606
 607         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 608         if (!cc->cpages) {
 609                 ret = -ENOMEM;
 610                 goto destroy_compress_ctx;
 611         }
 612
 613         for (i = 0; i < cc->nr_cpages; i++) {
 614                 cc->cpages[i] = f2fs_compress_alloc_page();
 615                 if (!cc->cpages[i]) {
 616                         ret = -ENOMEM;
 617                         goto out_free_cpages;
 618                 }
 619         }
 620
 621         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 622         if (!cc->rbuf) {
 623                 ret = -ENOMEM;
 624                 goto out_free_cpages;
 625         }
 626
 627         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 628         if (!cc->cbuf) {
 629                 ret = -ENOMEM;
 630                 goto out_vunmap_rbuf;
 631         }
 632
 633         ret = cops->compress_pages(cc);
 634         if (ret)
 635                 goto out_vunmap_cbuf;
 636
 637         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 638
 639         if (cc->clen > max_len) {
 640                 ret = -EAGAIN;
 641                 goto out_vunmap_cbuf;
 642         }
 643
 644         cc->cbuf->clen = cpu_to_le32(cc->clen);
 645
 646         if (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)
 647                 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
 648                                         cc->cbuf->cdata, cc->clen);
 649         cc->cbuf->chksum = cpu_to_le32(chksum);
 650
 651         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 652                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 653
 654         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 655
 656         /* Now we're going to cut unnecessary tail pages */
 657         new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
 658         if (!new_cpages) {
 659                 ret = -ENOMEM;
 660                 goto out_vunmap_cbuf;
 661         }
 662
 663         /* zero out any unused part of the last page */
 664         memset(&cc->cbuf->cdata[cc->clen], 0,
 665                         (new_nr_cpages * PAGE_SIZE) -
 666                         (cc->clen + COMPRESS_HEADER_SIZE));
 667
 668         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 669         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 670
 671         for (i = 0; i < cc->nr_cpages; i++) {
 672                 if (i < new_nr_cpages) {
 673                         new_cpages[i] = cc->cpages[i];
 674                         continue;
 675                 }
 676                 f2fs_compress_free_page(cc->cpages[i]);
 677                 cc->cpages[i] = NULL;
 678         }
 679
 680         if (cops->destroy_compress_ctx)
 681                 cops->destroy_compress_ctx(cc);
 682
 683         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 684         cc->cpages = new_cpages;
 685         cc->nr_cpages = new_nr_cpages;
 686
 687         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 688                                                         cc->clen, ret);
 689         return 0;
 690
 691 out_vunmap_cbuf:
 692         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 693 out_vunmap_rbuf:
 694         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 695 out_free_cpages:
 696         for (i = 0; i < cc->nr_cpages; i++) {
 697                 if (cc->cpages[i])
 698                         f2fs_compress_free_page(cc->cpages[i]);
 699         }
 700         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 701         cc->cpages = NULL;
 702 destroy_compress_ctx:
 703         if (cops->destroy_compress_ctx)
 704                 cops->destroy_compress_ctx(cc);
 705 out:
 706         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 707                                                         cc->clen, ret);
 708         return ret;
 709 }
 710
 711 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 712 {
 713         struct decompress_io_ctx *dic =
 714                         (struct decompress_io_ctx *)page_private(page);
 715         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 716         struct f2fs_inode_info *fi= F2FS_I(dic->inode);
 717         const struct f2fs_compress_ops *cops =
 718                         f2fs_cops[fi->i_compress_algorithm];
 719         int ret;
 720         int i;
 721
 722         dec_page_count(sbi, F2FS_RD_DATA);
 723
 724         if (bio->bi_status || PageError(page))
 725                 dic->failed = true;
 726
 727         if (atomic_dec_return(&dic->pending_pages))
 728                 return;
 729
 730         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 731                                 dic->cluster_size, fi->i_compress_algorithm);
 732
 733         /* submit partial compressed pages */
 734         if (dic->failed) {
 735                 ret = -EIO;
 736                 goto out_free_dic;
 737         }
 738
 739         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
 740         if (!dic->tpages) {
 741                 ret = -ENOMEM;
 742                 goto out_free_dic;
 743         }
 744
 745         for (i = 0; i < dic->cluster_size; i++) {
 746                 if (dic->rpages[i]) {
 747                         dic->tpages[i] = dic->rpages[i];
 748                         continue;
 749                 }
 750
 751                 dic->tpages[i] = f2fs_compress_alloc_page();
 752                 if (!dic->tpages[i]) {
 753                         ret = -ENOMEM;
 754                         goto out_free_dic;
 755                 }
 756         }
 757
 758         if (cops->init_decompress_ctx) {
 759                 ret = cops->init_decompress_ctx(dic);
 760                 if (ret)
 761                         goto out_free_dic;
 762         }
 763
 764         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
 765         if (!dic->rbuf) {
 766                 ret = -ENOMEM;
 767                 goto destroy_decompress_ctx;
 768         }
 769
 770         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
 771         if (!dic->cbuf) {
 772                 ret = -ENOMEM;
 773                 goto out_vunmap_rbuf;
 774         }
 775
 776         dic->clen = le32_to_cpu(dic->cbuf->clen);
 777         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 778
 779         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 780                 ret = -EFSCORRUPTED;
 781                 goto out_vunmap_cbuf;
 782         }
 783
 784         ret = cops->decompress_pages(dic);
 785
 786         if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
 787                 u32 provided = le32_to_cpu(dic->cbuf->chksum);
 788                 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
 789
 790                 if (provided != calculated) {
 791                         if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 792                                 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 793                                 printk_ratelimited(
 794                                         "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
 795                                         KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
 796                                         provided, calculated);
 797                         }
 798                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 799                 }
 800         }
 801
 802 out_vunmap_cbuf:
 803         vm_unmap_ram(dic->cbuf, dic->nr_cpages);
 804 out_vunmap_rbuf:
 805         vm_unmap_ram(dic->rbuf, dic->cluster_size);
 806 destroy_decompress_ctx:
 807         if (cops->destroy_decompress_ctx)
 808                 cops->destroy_decompress_ctx(dic);
 809 out_free_dic:
 810         if (!verity)
 811                 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
 812                                                                 ret, false);
 813
 814         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 815                                                         dic->clen, ret);
 816         if (!verity)
 817                 f2fs_free_dic(dic);
 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 static bool __cluster_may_compress(struct compress_ctx *cc)
 845 {
 846         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 847         loff_t i_size = i_size_read(cc->inode);
 848         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 849         int i;
 850
 851         for (i = 0; i < cc->cluster_size; i++) {
 852                 struct page *page = cc->rpages[i];
 853
 854                 f2fs_bug_on(sbi, !page);
 855
 856                 if (unlikely(f2fs_cp_error(sbi)))
 857                         return false;
 858                 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 859                         return false;
 860
 861                 /* beyond EOF */
 862                 if (page->index >= nr_pages)
 863                         return false;
 864         }
 865         return true;
 866 }
 867
 868 static int __f2fs_cluster_blocks(struct inode *inode,
 869                                 unsigned int cluster_idx, bool compr)
 870 {
 871         struct dnode_of_data dn;
 872         unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
 873         unsigned int start_idx = cluster_idx <<
 874                                 F2FS_I(inode)->i_log_cluster_size;
 875         int ret;
 876
 877         set_new_dnode(&dn, inode, NULL, NULL, 0);
 878         ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
 879         if (ret) {
 880                 if (ret == -ENOENT)
 881                         ret = 0;
 882                 goto fail;
 883         }
 884
 885         if (dn.data_blkaddr == COMPRESS_ADDR) {
 886                 int i;
 887
 888                 ret = 1;
 889                 for (i = 1; i < cluster_size; i++) {
 890                         block_t blkaddr;
 891
 892                         blkaddr = data_blkaddr(dn.inode,
 893                                         dn.node_page, dn.ofs_in_node + i);
 894                         if (compr) {
 895                                 if (__is_valid_data_blkaddr(blkaddr))
 896                                         ret++;
 897                         } else {
 898                                 if (blkaddr != NULL_ADDR)
 899                                         ret++;
 900                         }
 901                 }
 902
 903                 f2fs_bug_on(F2FS_I_SB(inode),
 904                         !compr && ret != cluster_size &&
 905                         !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
 906         }
 907 fail:
 908         f2fs_put_dnode(&dn);
 909         return ret;
 910 }
 911
 912 /* return # of compressed blocks in compressed cluster */
 913 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 914 {
 915         return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
 916 }
 917
 918 /* return # of valid blocks in compressed cluster */
 919 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 920 {
 921         return __f2fs_cluster_blocks(inode,
 922                 index >> F2FS_I(inode)->i_log_cluster_size,
 923                 false);
 924 }
 925
 926 static bool cluster_may_compress(struct compress_ctx *cc)
 927 {
 928         if (!f2fs_need_compress_data(cc->inode))
 929                 return false;
 930         if (f2fs_is_atomic_file(cc->inode))
 931                 return false;
 932         if (f2fs_is_mmap_file(cc->inode))
 933                 return false;
 934         if (!f2fs_cluster_is_full(cc))
 935                 return false;
 936         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
 937                 return false;
 938         return __cluster_may_compress(cc);
 939 }
 940
 941 static void set_cluster_writeback(struct compress_ctx *cc)
 942 {
 943         int i;
 944
 945         for (i = 0; i < cc->cluster_size; i++) {
 946                 if (cc->rpages[i])
 947                         set_page_writeback(cc->rpages[i]);
 948         }
 949 }
 950
 951 static void set_cluster_dirty(struct compress_ctx *cc)
 952 {
 953         int i;
 954
 955         for (i = 0; i < cc->cluster_size; i++)
 956                 if (cc->rpages[i])
 957                         set_page_dirty(cc->rpages[i]);
 958 }
 959
 960 static int prepare_compress_overwrite(struct compress_ctx *cc,
 961                 struct page **pagep, pgoff_t index, void **fsdata)
 962 {
 963         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 964         struct address_space *mapping = cc->inode->i_mapping;
 965         struct page *page;
 966         sector_t last_block_in_bio;
 967         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
 968         pgoff_t start_idx = start_idx_of_cluster(cc);
 969         int i, ret;
 970
 971 retry:
 972         ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
 973         if (ret <= 0)
 974                 return ret;
 975
 976         ret = f2fs_init_compress_ctx(cc);
 977         if (ret)
 978                 return ret;
 979
 980         /* keep page reference to avoid page reclaim */
 981         for (i = 0; i < cc->cluster_size; i++) {
 982                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
 983                                                         fgp_flag, GFP_NOFS);
 984                 if (!page) {
 985                         ret = -ENOMEM;
 986                         goto unlock_pages;
 987                 }
 988
 989                 if (PageUptodate(page))
 990                         f2fs_put_page(page, 1);
 991                 else
 992                         f2fs_compress_ctx_add_page(cc, page);
 993         }
 994
 995         if (!f2fs_cluster_is_empty(cc)) {
 996                 struct bio *bio = NULL;
 997
 998                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
 999                                         &last_block_in_bio, false, true);
1000                 f2fs_put_rpages(cc);
1001                 f2fs_destroy_compress_ctx(cc, true);
1002                 if (ret)
1003                         goto out;
1004                 if (bio)
1005                         f2fs_submit_bio(sbi, bio, DATA);
1006
1007                 ret = f2fs_init_compress_ctx(cc);
1008                 if (ret)
1009                         goto out;
1010         }
1011
1012         for (i = 0; i < cc->cluster_size; i++) {
1013                 f2fs_bug_on(sbi, cc->rpages[i]);
1014
1015                 page = find_lock_page(mapping, start_idx + i);
1016                 if (!page) {
1017                         /* page can be truncated */
1018                         goto release_and_retry;
1019                 }
1020
1021                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1022                 f2fs_compress_ctx_add_page(cc, page);
1023
1024                 if (!PageUptodate(page)) {
1025 release_and_retry:
1026                         f2fs_put_rpages(cc);
1027                         f2fs_unlock_rpages(cc, i + 1);
1028                         f2fs_destroy_compress_ctx(cc, true);
1029                         goto retry;
1030                 }
1031         }
1032
1033         if (likely(!ret)) {
1034                 *fsdata = cc->rpages;
1035                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1036                 return cc->cluster_size;
1037         }
1038
1039 unlock_pages:
1040         f2fs_put_rpages(cc);
1041         f2fs_unlock_rpages(cc, i);
1042         f2fs_destroy_compress_ctx(cc, true);
1043 out:
1044         return ret;
1045 }
1046
1047 int f2fs_prepare_compress_overwrite(struct inode *inode,
1048                 struct page **pagep, pgoff_t index, void **fsdata)
1049 {
1050         struct compress_ctx cc = {
1051                 .inode = inode,
1052                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1053                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1054                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1055                 .rpages = NULL,
1056                 .nr_rpages = 0,
1057         };
1058
1059         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1060 }
1061
1062 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1063                                         pgoff_t index, unsigned copied)
1064
1065 {
1066         struct compress_ctx cc = {
1067                 .inode = inode,
1068                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1069                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1070                 .rpages = fsdata,
1071         };
1072         bool first_index = (index == cc.rpages[0]->index);
1073
1074         if (copied)
1075                 set_cluster_dirty(&cc);
1076
1077         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1078         f2fs_destroy_compress_ctx(&cc, false);
1079
1080         return first_index;
1081 }
1082
1083 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1084 {
1085         void *fsdata = NULL;
1086         struct page *pagep;
1087         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1088         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1089                                                         log_cluster_size;
1090         int err;
1091
1092         err = f2fs_is_compressed_cluster(inode, start_idx);
1093         if (err < 0)
1094                 return err;
1095
1096         /* truncate normal cluster */
1097         if (!err)
1098                 return f2fs_do_truncate_blocks(inode, from, lock);
1099
1100         /* truncate compressed cluster */
1101         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1102                                                 start_idx, &fsdata);
1103
1104         /* should not be a normal cluster */
1105         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1106
1107         if (err <= 0)
1108                 return err;
1109
1110         if (err > 0) {
1111                 struct page **rpages = fsdata;
1112                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1113                 int i;
1114
1115                 for (i = cluster_size - 1; i >= 0; i--) {
1116                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1117
1118                         if (from <= start) {
1119                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1120                         } else {
1121                                 zero_user_segment(rpages[i], from - start,
1122                                                                 PAGE_SIZE);
1123                                 break;
1124                         }
1125                 }
1126
1127                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1128         }
1129         return 0;
1130 }
1131
1132 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1133                                         int *submitted,
1134                                         struct writeback_control *wbc,
1135                                         enum iostat_type io_type)
1136 {
1137         struct inode *inode = cc->inode;
1138         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1139         struct f2fs_inode_info *fi = F2FS_I(inode);
1140         struct f2fs_io_info fio = {
1141                 .sbi = sbi,
1142                 .ino = cc->inode->i_ino,
1143                 .type = DATA,
1144                 .op = REQ_OP_WRITE,
1145                 .op_flags = wbc_to_write_flags(wbc),
1146                 .old_blkaddr = NEW_ADDR,
1147                 .page = NULL,
1148                 .encrypted_page = NULL,
1149                 .compressed_page = NULL,
1150                 .submitted = false,
1151                 .io_type = io_type,
1152                 .io_wbc = wbc,
1153                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1154         };
1155         struct dnode_of_data dn;
1156         struct node_info ni;
1157         struct compress_io_ctx *cic;
1158         pgoff_t start_idx = start_idx_of_cluster(cc);
1159         unsigned int last_index = cc->cluster_size - 1;
1160         loff_t psize;
1161         int i, err;
1162
1163         /* we should bypass data pages to proceed the kworker jobs */
1164         if (unlikely(f2fs_cp_error(sbi))) {
1165                 mapping_set_error(cc->rpages[0]->mapping, -EIO);
1166                 goto out_free;
1167         }
1168
1169         if (IS_NOQUOTA(inode)) {
1170                 /*
1171                  * We need to wait for node_write to avoid block allocation during
1172                  * checkpoint. This can only happen to quota writes which can cause
1173                  * the below discard race condition.
1174                  */
1175                 down_read(&sbi->node_write);
1176         } else if (!f2fs_trylock_op(sbi)) {
1177                 goto out_free;
1178         }
1179
1180         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1181
1182         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1183         if (err)
1184                 goto out_unlock_op;
1185
1186         for (i = 0; i < cc->cluster_size; i++) {
1187                 if (data_blkaddr(dn.inode, dn.node_page,
1188                                         dn.ofs_in_node + i) == NULL_ADDR)
1189                         goto out_put_dnode;
1190         }
1191
1192         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1193
1194         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1195         if (err)
1196                 goto out_put_dnode;
1197
1198         fio.version = ni.version;
1199
1200         cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1201         if (!cic)
1202                 goto out_put_dnode;
1203
1204         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1205         cic->inode = inode;
1206         atomic_set(&cic->pending_pages, cc->nr_cpages);
1207         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1208         if (!cic->rpages)
1209                 goto out_put_cic;
1210
1211         cic->nr_rpages = cc->cluster_size;
1212
1213         for (i = 0; i < cc->nr_cpages; i++) {
1214                 f2fs_set_compressed_page(cc->cpages[i], inode,
1215                                         cc->rpages[i + 1]->index, cic);
1216                 fio.compressed_page = cc->cpages[i];
1217
1218                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1219                                                 dn.ofs_in_node + i + 1);
1220
1221                 /* wait for GCed page writeback via META_MAPPING */
1222                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1223
1224                 if (fio.encrypted) {
1225                         fio.page = cc->rpages[i + 1];
1226                         err = f2fs_encrypt_one_page(&fio);
1227                         if (err)
1228                                 goto out_destroy_crypt;
1229                         cc->cpages[i] = fio.encrypted_page;
1230                 }
1231         }
1232
1233         set_cluster_writeback(cc);
1234
1235         for (i = 0; i < cc->cluster_size; i++)
1236                 cic->rpages[i] = cc->rpages[i];
1237
1238         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1239                 block_t blkaddr;
1240
1241                 blkaddr = f2fs_data_blkaddr(&dn);
1242                 fio.page = cc->rpages[i];
1243                 fio.old_blkaddr = blkaddr;
1244
1245                 /* cluster header */
1246                 if (i == 0) {
1247                         if (blkaddr == COMPRESS_ADDR)
1248                                 fio.compr_blocks++;
1249                         if (__is_valid_data_blkaddr(blkaddr))
1250                                 f2fs_invalidate_blocks(sbi, blkaddr);
1251                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1252                         goto unlock_continue;
1253                 }
1254
1255                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1256                         fio.compr_blocks++;
1257
1258                 if (i > cc->nr_cpages) {
1259                         if (__is_valid_data_blkaddr(blkaddr)) {
1260                                 f2fs_invalidate_blocks(sbi, blkaddr);
1261                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1262                         }
1263                         goto unlock_continue;
1264                 }
1265
1266                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1267
1268                 if (fio.encrypted)
1269                         fio.encrypted_page = cc->cpages[i - 1];
1270                 else
1271                         fio.compressed_page = cc->cpages[i - 1];
1272
1273                 cc->cpages[i - 1] = NULL;
1274                 f2fs_outplace_write_data(&dn, &fio);
1275                 (*submitted)++;
1276 unlock_continue:
1277                 inode_dec_dirty_pages(cc->inode);
1278                 unlock_page(fio.page);
1279         }
1280
1281         if (fio.compr_blocks)
1282                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1283         f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1284
1285         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1286         if (cc->cluster_idx == 0)
1287                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1288
1289         f2fs_put_dnode(&dn);
1290         if (IS_NOQUOTA(inode))
1291                 up_read(&sbi->node_write);
1292         else
1293                 f2fs_unlock_op(sbi);
1294
1295         spin_lock(&fi->i_size_lock);
1296         if (fi->last_disk_size < psize)
1297                 fi->last_disk_size = psize;
1298         spin_unlock(&fi->i_size_lock);
1299
1300         f2fs_put_rpages(cc);
1301         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1302         cc->cpages = NULL;
1303         f2fs_destroy_compress_ctx(cc, false);
1304         return 0;
1305
1306 out_destroy_crypt:
1307         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1308
1309         for (--i; i >= 0; i--)
1310                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1311 out_put_cic:
1312         kmem_cache_free(cic_entry_slab, cic);
1313 out_put_dnode:
1314         f2fs_put_dnode(&dn);
1315 out_unlock_op:
1316         if (IS_NOQUOTA(inode))
1317                 up_read(&sbi->node_write);
1318         else
1319                 f2fs_unlock_op(sbi);
1320 out_free:
1321         for (i = 0; i < cc->nr_cpages; i++) {
1322                 if (!cc->cpages[i])
1323                         continue;
1324                 f2fs_compress_free_page(cc->cpages[i]);
1325                 cc->cpages[i] = NULL;
1326         }
1327         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1328         cc->cpages = NULL;
1329         return -EAGAIN;
1330 }
1331
1332 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1333 {
1334         struct f2fs_sb_info *sbi = bio->bi_private;
1335         struct compress_io_ctx *cic =
1336                         (struct compress_io_ctx *)page_private(page);
1337         int i;
1338
1339         if (unlikely(bio->bi_status))
1340                 mapping_set_error(cic->inode->i_mapping, -EIO);
1341
1342         f2fs_compress_free_page(page);
1343
1344         dec_page_count(sbi, F2FS_WB_DATA);
1345
1346         if (atomic_dec_return(&cic->pending_pages))
1347                 return;
1348
1349         for (i = 0; i < cic->nr_rpages; i++) {
1350                 WARN_ON(!cic->rpages[i]);
1351                 clear_cold_data(cic->rpages[i]);
1352                 end_page_writeback(cic->rpages[i]);
1353         }
1354
1355         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1356         kmem_cache_free(cic_entry_slab, cic);
1357 }
1358
1359 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1360                                         int *submitted,
1361                                         struct writeback_control *wbc,
1362                                         enum iostat_type io_type)
1363 {
1364         struct address_space *mapping = cc->inode->i_mapping;
1365         int _submitted, compr_blocks, ret, i;
1366
1367         compr_blocks = f2fs_compressed_blocks(cc);
1368
1369         for (i = 0; i < cc->cluster_size; i++) {
1370                 if (!cc->rpages[i])
1371                         continue;
1372
1373                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1374                 unlock_page(cc->rpages[i]);
1375         }
1376
1377         if (compr_blocks < 0)
1378                 return compr_blocks;
1379
1380         for (i = 0; i < cc->cluster_size; i++) {
1381                 if (!cc->rpages[i])
1382                         continue;
1383 retry_write:
1384                 lock_page(cc->rpages[i]);
1385
1386                 if (cc->rpages[i]->mapping != mapping) {
1387 continue_unlock:
1388                         unlock_page(cc->rpages[i]);
1389                         continue;
1390                 }
1391
1392                 if (!PageDirty(cc->rpages[i]))
1393                         goto continue_unlock;
1394
1395                 if (PageWriteback(cc->rpages[i])) {
1396                         if (wbc->sync_mode == WB_SYNC_NONE)
1397                                 goto continue_unlock;
1398                         f2fs_wait_on_page_writeback(cc->rpages[i], DATA, true, true);
1399                 }
1400
1401                 if (!clear_page_dirty_for_io(cc->rpages[i]))
1402                         goto continue_unlock;
1403
1404                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1405                                                 NULL, NULL, wbc, io_type,
1406                                                 compr_blocks, false);
1407                 if (ret) {
1408                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1409                                 unlock_page(cc->rpages[i]);
1410                                 ret = 0;
1411                         } else if (ret == -EAGAIN) {
1412                                 /*
1413                                  * for quota file, just redirty left pages to
1414                                  * avoid deadlock caused by cluster update race
1415                                  * from foreground operation.
1416                                  */
1417                                 if (IS_NOQUOTA(cc->inode))
1418                                         return 0;
1419                                 ret = 0;
1420                                 cond_resched();
1421                                 congestion_wait(BLK_RW_ASYNC,
1422                                                 DEFAULT_IO_TIMEOUT);
1423                                 goto retry_write;
1424                         }
1425                         return ret;
1426                 }
1427
1428                 *submitted += _submitted;
1429         }
1430
1431         f2fs_balance_fs(F2FS_M_SB(mapping), true);
1432
1433         return 0;
1434 }
1435
1436 int f2fs_write_multi_pages(struct compress_ctx *cc,
1437                                         int *submitted,
1438                                         struct writeback_control *wbc,
1439                                         enum iostat_type io_type)
1440 {
1441         int err;
1442
1443         *submitted = 0;
1444         if (cluster_may_compress(cc)) {
1445                 err = f2fs_compress_pages(cc);
1446                 if (err == -EAGAIN) {
1447                         goto write;
1448                 } else if (err) {
1449                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1450                         goto destroy_out;
1451                 }
1452
1453                 err = f2fs_write_compressed_pages(cc, submitted,
1454                                                         wbc, io_type);
1455                 if (!err)
1456                         return 0;
1457                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1458         }
1459 write:
1460         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1461
1462         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1463         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1464 destroy_out:
1465         f2fs_destroy_compress_ctx(cc, false);
1466         return err;
1467 }
1468
1469 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1470 {
1471         struct decompress_io_ctx *dic;
1472         pgoff_t start_idx = start_idx_of_cluster(cc);
1473         int i;
1474
1475         dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1476         if (!dic)
1477                 return ERR_PTR(-ENOMEM);
1478
1479         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1480         if (!dic->rpages) {
1481                 kmem_cache_free(dic_entry_slab, dic);
1482                 return ERR_PTR(-ENOMEM);
1483         }
1484
1485         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1486         dic->inode = cc->inode;
1487         atomic_set(&dic->pending_pages, cc->nr_cpages);
1488         dic->cluster_idx = cc->cluster_idx;
1489         dic->cluster_size = cc->cluster_size;
1490         dic->log_cluster_size = cc->log_cluster_size;
1491         dic->nr_cpages = cc->nr_cpages;
1492         dic->failed = false;
1493
1494         for (i = 0; i < dic->cluster_size; i++)
1495                 dic->rpages[i] = cc->rpages[i];
1496         dic->nr_rpages = cc->cluster_size;
1497
1498         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1499         if (!dic->cpages)
1500                 goto out_free;
1501
1502         for (i = 0; i < dic->nr_cpages; i++) {
1503                 struct page *page;
1504
1505                 page = f2fs_compress_alloc_page();
1506                 if (!page)
1507                         goto out_free;
1508
1509                 f2fs_set_compressed_page(page, cc->inode,
1510                                         start_idx + i + 1, dic);
1511                 dic->cpages[i] = page;
1512         }
1513
1514         return dic;
1515
1516 out_free:
1517         f2fs_free_dic(dic);
1518         return ERR_PTR(-ENOMEM);
1519 }
1520
1521 void f2fs_free_dic(struct decompress_io_ctx *dic)
1522 {
1523         int i;
1524
1525         if (dic->tpages) {
1526                 for (i = 0; i < dic->cluster_size; i++) {
1527                         if (dic->rpages[i])
1528                                 continue;
1529                         if (!dic->tpages[i])
1530                                 continue;
1531                         f2fs_compress_free_page(dic->tpages[i]);
1532                 }
1533                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1534         }
1535
1536         if (dic->cpages) {
1537                 for (i = 0; i < dic->nr_cpages; i++) {
1538                         if (!dic->cpages[i])
1539                                 continue;
1540                         f2fs_compress_free_page(dic->cpages[i]);
1541                 }
1542                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1543         }
1544
1545         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1546         kmem_cache_free(dic_entry_slab, dic);
1547 }
1548
1549 void f2fs_decompress_end_io(struct page **rpages,
1550                         unsigned int cluster_size, bool err, bool verity)
1551 {
1552         int i;
1553
1554         for (i = 0; i < cluster_size; i++) {
1555                 struct page *rpage = rpages[i];
1556
1557                 if (!rpage)
1558                         continue;
1559
1560                 if (err || PageError(rpage))
1561                         goto clear_uptodate;
1562
1563                 if (!verity || fsverity_verify_page(rpage)) {
1564                         SetPageUptodate(rpage);
1565                         goto unlock;
1566                 }
1567 clear_uptodate:
1568                 ClearPageUptodate(rpage);
1569                 ClearPageError(rpage);
1570 unlock:
1571                 unlock_page(rpage);
1572         }
1573 }
1574
1575 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1576 {
1577         dev_t dev = sbi->sb->s_bdev->bd_dev;
1578         char slab_name[35];
1579
1580         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1581
1582         sbi->page_array_slab_size = sizeof(struct page *) <<
1583                                         F2FS_OPTION(sbi).compress_log_size;
1584
1585         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1586                                         sbi->page_array_slab_size);
1587         if (!sbi->page_array_slab)
1588                 return -ENOMEM;
1589         return 0;
1590 }
1591
1592 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1593 {
1594         kmem_cache_destroy(sbi->page_array_slab);
1595 }
1596
1597 static int __init f2fs_init_cic_cache(void)
1598 {
1599         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1600                                         sizeof(struct compress_io_ctx));
1601         if (!cic_entry_slab)
1602                 return -ENOMEM;
1603         return 0;
1604 }
1605
1606 static void f2fs_destroy_cic_cache(void)
1607 {
1608         kmem_cache_destroy(cic_entry_slab);
1609 }
1610
1611 static int __init f2fs_init_dic_cache(void)
1612 {
1613         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1614                                         sizeof(struct decompress_io_ctx));
1615         if (!dic_entry_slab)
1616                 return -ENOMEM;
1617         return 0;
1618 }
1619
1620 static void f2fs_destroy_dic_cache(void)
1621 {
1622         kmem_cache_destroy(dic_entry_slab);
1623 }
1624
1625 int __init f2fs_init_compress_cache(void)
1626 {
1627         int err;
1628
1629         err = f2fs_init_cic_cache();
1630         if (err)
1631                 goto out;
1632         err = f2fs_init_dic_cache();
1633         if (err)
1634                 goto free_cic;
1635         return 0;
1636 free_cic:
1637         f2fs_destroy_cic_cache();
1638 out:
1639         return -ENOMEM;
1640 }
1641
1642 void f2fs_destroy_compress_cache(void)
1643 {
1644         f2fs_destroy_dic_cache();
1645         f2fs_destroy_cic_cache();
1646 }