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_mapping(struct address_space *mapping,
 127                                 pgoff_t start, int len)
 128 {
 129         int i;
 130
 131         for (i = 0; i < len; i++) {
 132                 struct page *page = find_get_page(mapping, start + i);
 133
 134                 put_page(page);
 135                 put_page(page);
 136         }
 137 }
 138
 139 static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
 140                 struct writeback_control *wbc, bool redirty, int unlock)
 141 {
 142         unsigned int i;
 143
 144         for (i = 0; i < cc->cluster_size; i++) {
 145                 if (!cc->rpages[i])
 146                         continue;
 147                 if (redirty)
 148                         redirty_page_for_writepage(wbc, cc->rpages[i]);
 149                 f2fs_put_page(cc->rpages[i], unlock);
 150         }
 151 }
 152
 153 struct page *f2fs_compress_control_page(struct page *page)
 154 {
 155         return ((struct compress_io_ctx *)page_private(page))->rpages[0];
 156 }
 157
 158 int f2fs_init_compress_ctx(struct compress_ctx *cc)
 159 {
 160         if (cc->rpages)
 161                 return 0;
 162
 163         cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 164         return cc->rpages ? 0 : -ENOMEM;
 165 }
 166
 167 void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
 168 {
 169         page_array_free(cc->inode, cc->rpages, cc->cluster_size);
 170         cc->rpages = NULL;
 171         cc->nr_rpages = 0;
 172         cc->nr_cpages = 0;
 173         cc->cluster_idx = NULL_CLUSTER;
 174 }
 175
 176 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 177 {
 178         unsigned int cluster_ofs;
 179
 180         if (!f2fs_cluster_can_merge_page(cc, page->index))
 181                 f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 182
 183         cluster_ofs = offset_in_cluster(cc, page->index);
 184         cc->rpages[cluster_ofs] = page;
 185         cc->nr_rpages++;
 186         cc->cluster_idx = cluster_idx(cc, page->index);
 187 }
 188
 189 #ifdef CONFIG_F2FS_FS_LZO
 190 static int lzo_init_compress_ctx(struct compress_ctx *cc)
 191 {
 192         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 193                                 LZO1X_MEM_COMPRESS, GFP_NOFS);
 194         if (!cc->private)
 195                 return -ENOMEM;
 196
 197         cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
 198         return 0;
 199 }
 200
 201 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 202 {
 203         kvfree(cc->private);
 204         cc->private = NULL;
 205 }
 206
 207 static int lzo_compress_pages(struct compress_ctx *cc)
 208 {
 209         int ret;
 210
 211         ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 212                                         &cc->clen, cc->private);
 213         if (ret != LZO_E_OK) {
 214                 printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
 215                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 216                 return -EIO;
 217         }
 218         return 0;
 219 }
 220
 221 static int lzo_decompress_pages(struct decompress_io_ctx *dic)
 222 {
 223         int ret;
 224
 225         ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
 226                                                 dic->rbuf, &dic->rlen);
 227         if (ret != LZO_E_OK) {
 228                 printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
 229                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 230                 return -EIO;
 231         }
 232
 233         if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
 234                 printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
 235                                         "expected:%lu\n", KERN_ERR,
 236                                         F2FS_I_SB(dic->inode)->sb->s_id,
 237                                         dic->rlen,
 238                                         PAGE_SIZE << dic->log_cluster_size);
 239                 return -EIO;
 240         }
 241         return 0;
 242 }
 243
 244 static const struct f2fs_compress_ops f2fs_lzo_ops = {
 245         .init_compress_ctx      = lzo_init_compress_ctx,
 246         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 247         .compress_pages         = lzo_compress_pages,
 248         .decompress_pages       = lzo_decompress_pages,
 249 };
 250 #endif
 251
 252 #ifdef CONFIG_F2FS_FS_LZ4
 253 static int lz4_init_compress_ctx(struct compress_ctx *cc)
 254 {
 255         cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 256                                 LZ4_MEM_COMPRESS, GFP_NOFS);
 257         if (!cc->private)
 258                 return -ENOMEM;
 259
 260         /*
 261          * we do not change cc->clen to LZ4_compressBound(inputsize) to
 262          * adapt worst compress case, because lz4 compressor can handle
 263          * output budget properly.
 264          */
 265         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 266         return 0;
 267 }
 268
 269 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 270 {
 271         kvfree(cc->private);
 272         cc->private = NULL;
 273 }
 274
 275 static int lz4_compress_pages(struct compress_ctx *cc)
 276 {
 277         int len;
 278
 279         len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
 280                                                 cc->clen, cc->private);
 281         if (!len)
 282                 return -EAGAIN;
 283
 284         cc->clen = len;
 285         return 0;
 286 }
 287
 288 static int lz4_decompress_pages(struct decompress_io_ctx *dic)
 289 {
 290         int ret;
 291
 292         ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
 293                                                 dic->clen, dic->rlen);
 294         if (ret < 0) {
 295                 printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
 296                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
 297                 return -EIO;
 298         }
 299
 300         if (ret != PAGE_SIZE << dic->log_cluster_size) {
 301                 printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
 302                                         "expected:%lu\n", KERN_ERR,
 303                                         F2FS_I_SB(dic->inode)->sb->s_id,
 304                                         dic->rlen,
 305                                         PAGE_SIZE << dic->log_cluster_size);
 306                 return -EIO;
 307         }
 308         return 0;
 309 }
 310
 311 static const struct f2fs_compress_ops f2fs_lz4_ops = {
 312         .init_compress_ctx      = lz4_init_compress_ctx,
 313         .destroy_compress_ctx   = lz4_destroy_compress_ctx,
 314         .compress_pages         = lz4_compress_pages,
 315         .decompress_pages       = lz4_decompress_pages,
 316 };
 317 #endif
 318
 319 #ifdef CONFIG_F2FS_FS_ZSTD
 320 #define F2FS_ZSTD_DEFAULT_CLEVEL        1
 321
 322 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 323 {
 324         ZSTD_parameters params;
 325         ZSTD_CStream *stream;
 326         void *workspace;
 327         unsigned int workspace_size;
 328
 329         params = ZSTD_getParams(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen, 0);
 330         workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
 331
 332         workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
 333                                         workspace_size, GFP_NOFS);
 334         if (!workspace)
 335                 return -ENOMEM;
 336
 337         stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
 338         if (!stream) {
 339                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
 340                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 341                                 __func__);
 342                 kvfree(workspace);
 343                 return -EIO;
 344         }
 345
 346         cc->private = workspace;
 347         cc->private2 = stream;
 348
 349         cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 350         return 0;
 351 }
 352
 353 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 354 {
 355         kvfree(cc->private);
 356         cc->private = NULL;
 357         cc->private2 = NULL;
 358 }
 359
 360 static int zstd_compress_pages(struct compress_ctx *cc)
 361 {
 362         ZSTD_CStream *stream = cc->private2;
 363         ZSTD_inBuffer inbuf;
 364         ZSTD_outBuffer outbuf;
 365         int src_size = cc->rlen;
 366         int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
 367         int ret;
 368
 369         inbuf.pos = 0;
 370         inbuf.src = cc->rbuf;
 371         inbuf.size = src_size;
 372
 373         outbuf.pos = 0;
 374         outbuf.dst = cc->cbuf->cdata;
 375         outbuf.size = dst_size;
 376
 377         ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
 378         if (ZSTD_isError(ret)) {
 379                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 380                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 381                                 __func__, ZSTD_getErrorCode(ret));
 382                 return -EIO;
 383         }
 384
 385         ret = ZSTD_endStream(stream, &outbuf);
 386         if (ZSTD_isError(ret)) {
 387                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
 388                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
 389                                 __func__, ZSTD_getErrorCode(ret));
 390                 return -EIO;
 391         }
 392
 393         /*
 394          * there is compressed data remained in intermediate buffer due to
 395          * no more space in cbuf.cdata
 396          */
 397         if (ret)
 398                 return -EAGAIN;
 399
 400         cc->clen = outbuf.pos;
 401         return 0;
 402 }
 403
 404 static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 405 {
 406         ZSTD_DStream *stream;
 407         void *workspace;
 408         unsigned int workspace_size;
 409         unsigned int max_window_size =
 410                         MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 411
 412         workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
 413
 414         workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 415                                         workspace_size, GFP_NOFS);
 416         if (!workspace)
 417                 return -ENOMEM;
 418
 419         stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
 420         if (!stream) {
 421                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
 422                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 423                                 __func__);
 424                 kvfree(workspace);
 425                 return -EIO;
 426         }
 427
 428         dic->private = workspace;
 429         dic->private2 = stream;
 430
 431         return 0;
 432 }
 433
 434 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 435 {
 436         kvfree(dic->private);
 437         dic->private = NULL;
 438         dic->private2 = NULL;
 439 }
 440
 441 static int zstd_decompress_pages(struct decompress_io_ctx *dic)
 442 {
 443         ZSTD_DStream *stream = dic->private2;
 444         ZSTD_inBuffer inbuf;
 445         ZSTD_outBuffer outbuf;
 446         int ret;
 447
 448         inbuf.pos = 0;
 449         inbuf.src = dic->cbuf->cdata;
 450         inbuf.size = dic->clen;
 451
 452         outbuf.pos = 0;
 453         outbuf.dst = dic->rbuf;
 454         outbuf.size = dic->rlen;
 455
 456         ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
 457         if (ZSTD_isError(ret)) {
 458                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
 459                                 KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
 460                                 __func__, ZSTD_getErrorCode(ret));
 461                 return -EIO;
 462         }
 463
 464         if (dic->rlen != outbuf.pos) {
 465                 printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
 466                                 "expected:%lu\n", KERN_ERR,
 467                                 F2FS_I_SB(dic->inode)->sb->s_id,
 468                                 __func__, dic->rlen,
 469                                 PAGE_SIZE << dic->log_cluster_size);
 470                 return -EIO;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static const struct f2fs_compress_ops f2fs_zstd_ops = {
 477         .init_compress_ctx      = zstd_init_compress_ctx,
 478         .destroy_compress_ctx   = zstd_destroy_compress_ctx,
 479         .compress_pages         = zstd_compress_pages,
 480         .init_decompress_ctx    = zstd_init_decompress_ctx,
 481         .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
 482         .decompress_pages       = zstd_decompress_pages,
 483 };
 484 #endif
 485
 486 #ifdef CONFIG_F2FS_FS_LZO
 487 #ifdef CONFIG_F2FS_FS_LZORLE
 488 static int lzorle_compress_pages(struct compress_ctx *cc)
 489 {
 490         int ret;
 491
 492         ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
 493                                         &cc->clen, cc->private);
 494         if (ret != LZO_E_OK) {
 495                 printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
 496                                 KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
 497                 return -EIO;
 498         }
 499         return 0;
 500 }
 501
 502 static const struct f2fs_compress_ops f2fs_lzorle_ops = {
 503         .init_compress_ctx      = lzo_init_compress_ctx,
 504         .destroy_compress_ctx   = lzo_destroy_compress_ctx,
 505         .compress_pages         = lzorle_compress_pages,
 506         .decompress_pages       = lzo_decompress_pages,
 507 };
 508 #endif
 509 #endif
 510
 511 static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
 512 #ifdef CONFIG_F2FS_FS_LZO
 513         &f2fs_lzo_ops,
 514 #else
 515         NULL,
 516 #endif
 517 #ifdef CONFIG_F2FS_FS_LZ4
 518         &f2fs_lz4_ops,
 519 #else
 520         NULL,
 521 #endif
 522 #ifdef CONFIG_F2FS_FS_ZSTD
 523         &f2fs_zstd_ops,
 524 #else
 525         NULL,
 526 #endif
 527 #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
 528         &f2fs_lzorle_ops,
 529 #else
 530         NULL,
 531 #endif
 532 };
 533
 534 bool f2fs_is_compress_backend_ready(struct inode *inode)
 535 {
 536         if (!f2fs_compressed_file(inode))
 537                 return true;
 538         return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
 539 }
 540
 541 static mempool_t *compress_page_pool;
 542 static int num_compress_pages = 512;
 543 module_param(num_compress_pages, uint, 0444);
 544 MODULE_PARM_DESC(num_compress_pages,
 545                 "Number of intermediate compress pages to preallocate");
 546
 547 int f2fs_init_compress_mempool(void)
 548 {
 549         compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
 550         if (!compress_page_pool)
 551                 return -ENOMEM;
 552
 553         return 0;
 554 }
 555
 556 void f2fs_destroy_compress_mempool(void)
 557 {
 558         mempool_destroy(compress_page_pool);
 559 }
 560
 561 static struct page *f2fs_compress_alloc_page(void)
 562 {
 563         struct page *page;
 564
 565         page = mempool_alloc(compress_page_pool, GFP_NOFS);
 566         lock_page(page);
 567
 568         return page;
 569 }
 570
 571 static void f2fs_compress_free_page(struct page *page)
 572 {
 573         if (!page)
 574                 return;
 575         set_page_private(page, (unsigned long)NULL);
 576         ClearPagePrivate(page);
 577         page->mapping = NULL;
 578         unlock_page(page);
 579         mempool_free(page, compress_page_pool);
 580 }
 581
 582 #define MAX_VMAP_RETRIES        3
 583
 584 static void *f2fs_vmap(struct page **pages, unsigned int count)
 585 {
 586         int i;
 587         void *buf = NULL;
 588
 589         for (i = 0; i < MAX_VMAP_RETRIES; i++) {
 590                 buf = vm_map_ram(pages, count, -1);
 591                 if (buf)
 592                         break;
 593                 vm_unmap_aliases();
 594         }
 595         return buf;
 596 }
 597
 598 static int f2fs_compress_pages(struct compress_ctx *cc)
 599 {
 600         struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 601         const struct f2fs_compress_ops *cops =
 602                                 f2fs_cops[fi->i_compress_algorithm];
 603         unsigned int max_len, new_nr_cpages;
 604         struct page **new_cpages;
 605         int i, ret;
 606
 607         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 608                                 cc->cluster_size, fi->i_compress_algorithm);
 609
 610         if (cops->init_compress_ctx) {
 611                 ret = cops->init_compress_ctx(cc);
 612                 if (ret)
 613                         goto out;
 614         }
 615
 616         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 617         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 618
 619         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 620         if (!cc->cpages) {
 621                 ret = -ENOMEM;
 622                 goto destroy_compress_ctx;
 623         }
 624
 625         for (i = 0; i < cc->nr_cpages; i++) {
 626                 cc->cpages[i] = f2fs_compress_alloc_page();
 627                 if (!cc->cpages[i]) {
 628                         ret = -ENOMEM;
 629                         goto out_free_cpages;
 630                 }
 631         }
 632
 633         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 634         if (!cc->rbuf) {
 635                 ret = -ENOMEM;
 636                 goto out_free_cpages;
 637         }
 638
 639         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 640         if (!cc->cbuf) {
 641                 ret = -ENOMEM;
 642                 goto out_vunmap_rbuf;
 643         }
 644
 645         ret = cops->compress_pages(cc);
 646         if (ret)
 647                 goto out_vunmap_cbuf;
 648
 649         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 650
 651         if (cc->clen > max_len) {
 652                 ret = -EAGAIN;
 653                 goto out_vunmap_cbuf;
 654         }
 655
 656         cc->cbuf->clen = cpu_to_le32(cc->clen);
 657
 658         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 659                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 660
 661         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 662
 663         /* Now we're going to cut unnecessary tail pages */
 664         new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
 665         if (!new_cpages) {
 666                 ret = -ENOMEM;
 667                 goto out_vunmap_cbuf;
 668         }
 669
 670         /* zero out any unused part of the last page */
 671         memset(&cc->cbuf->cdata[cc->clen], 0,
 672                         (new_nr_cpages * PAGE_SIZE) -
 673                         (cc->clen + COMPRESS_HEADER_SIZE));
 674
 675         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 676         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 677
 678         for (i = 0; i < cc->nr_cpages; i++) {
 679                 if (i < new_nr_cpages) {
 680                         new_cpages[i] = cc->cpages[i];
 681                         continue;
 682                 }
 683                 f2fs_compress_free_page(cc->cpages[i]);
 684                 cc->cpages[i] = NULL;
 685         }
 686
 687         if (cops->destroy_compress_ctx)
 688                 cops->destroy_compress_ctx(cc);
 689
 690         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 691         cc->cpages = new_cpages;
 692         cc->nr_cpages = new_nr_cpages;
 693
 694         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 695                                                         cc->clen, ret);
 696         return 0;
 697
 698 out_vunmap_cbuf:
 699         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 700 out_vunmap_rbuf:
 701         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 702 out_free_cpages:
 703         for (i = 0; i < cc->nr_cpages; i++) {
 704                 if (cc->cpages[i])
 705                         f2fs_compress_free_page(cc->cpages[i]);
 706         }
 707         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 708         cc->cpages = NULL;
 709 destroy_compress_ctx:
 710         if (cops->destroy_compress_ctx)
 711                 cops->destroy_compress_ctx(cc);
 712 out:
 713         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 714                                                         cc->clen, ret);
 715         return ret;
 716 }
 717
 718 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 719 {
 720         struct decompress_io_ctx *dic =
 721                         (struct decompress_io_ctx *)page_private(page);
 722         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 723         struct f2fs_inode_info *fi= F2FS_I(dic->inode);
 724         const struct f2fs_compress_ops *cops =
 725                         f2fs_cops[fi->i_compress_algorithm];
 726         int ret;
 727         int i;
 728
 729         dec_page_count(sbi, F2FS_RD_DATA);
 730
 731         if (bio->bi_status || PageError(page))
 732                 dic->failed = true;
 733
 734         if (atomic_dec_return(&dic->pending_pages))
 735                 return;
 736
 737         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 738                                 dic->cluster_size, fi->i_compress_algorithm);
 739
 740         /* submit partial compressed pages */
 741         if (dic->failed) {
 742                 ret = -EIO;
 743                 goto out_free_dic;
 744         }
 745
 746         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
 747         if (!dic->tpages) {
 748                 ret = -ENOMEM;
 749                 goto out_free_dic;
 750         }
 751
 752         for (i = 0; i < dic->cluster_size; i++) {
 753                 if (dic->rpages[i]) {
 754                         dic->tpages[i] = dic->rpages[i];
 755                         continue;
 756                 }
 757
 758                 dic->tpages[i] = f2fs_compress_alloc_page();
 759                 if (!dic->tpages[i]) {
 760                         ret = -ENOMEM;
 761                         goto out_free_dic;
 762                 }
 763         }
 764
 765         if (cops->init_decompress_ctx) {
 766                 ret = cops->init_decompress_ctx(dic);
 767                 if (ret)
 768                         goto out_free_dic;
 769         }
 770
 771         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
 772         if (!dic->rbuf) {
 773                 ret = -ENOMEM;
 774                 goto destroy_decompress_ctx;
 775         }
 776
 777         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
 778         if (!dic->cbuf) {
 779                 ret = -ENOMEM;
 780                 goto out_vunmap_rbuf;
 781         }
 782
 783         dic->clen = le32_to_cpu(dic->cbuf->clen);
 784         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 785
 786         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 787                 ret = -EFSCORRUPTED;
 788                 goto out_vunmap_cbuf;
 789         }
 790
 791         ret = cops->decompress_pages(dic);
 792
 793 out_vunmap_cbuf:
 794         vm_unmap_ram(dic->cbuf, dic->nr_cpages);
 795 out_vunmap_rbuf:
 796         vm_unmap_ram(dic->rbuf, dic->cluster_size);
 797 destroy_decompress_ctx:
 798         if (cops->destroy_decompress_ctx)
 799                 cops->destroy_decompress_ctx(dic);
 800 out_free_dic:
 801         if (verity)
 802                 atomic_set(&dic->pending_pages, dic->nr_cpages);
 803         if (!verity)
 804                 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
 805                                                                 ret, false);
 806
 807         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 808                                                         dic->clen, ret);
 809         if (!verity)
 810                 f2fs_free_dic(dic);
 811 }
 812
 813 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 814 {
 815         if (cc->cluster_idx == NULL_CLUSTER)
 816                 return true;
 817         return cc->cluster_idx == cluster_idx(cc, index);
 818 }
 819
 820 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 821 {
 822         return cc->nr_rpages == 0;
 823 }
 824
 825 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 826 {
 827         return cc->cluster_size == cc->nr_rpages;
 828 }
 829
 830 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 831 {
 832         if (f2fs_cluster_is_empty(cc))
 833                 return true;
 834         return is_page_in_cluster(cc, index);
 835 }
 836
 837 static bool __cluster_may_compress(struct compress_ctx *cc)
 838 {
 839         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 840         loff_t i_size = i_size_read(cc->inode);
 841         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 842         int i;
 843
 844         for (i = 0; i < cc->cluster_size; i++) {
 845                 struct page *page = cc->rpages[i];
 846
 847                 f2fs_bug_on(sbi, !page);
 848
 849                 if (unlikely(f2fs_cp_error(sbi)))
 850                         return false;
 851                 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 852                         return false;
 853
 854                 /* beyond EOF */
 855                 if (page->index >= nr_pages)
 856                         return false;
 857         }
 858         return true;
 859 }
 860
 861 static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
 862 {
 863         struct dnode_of_data dn;
 864         int ret;
 865
 866         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
 867         ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
 868                                                         LOOKUP_NODE);
 869         if (ret) {
 870                 if (ret == -ENOENT)
 871                         ret = 0;
 872                 goto fail;
 873         }
 874
 875         if (dn.data_blkaddr == COMPRESS_ADDR) {
 876                 int i;
 877
 878                 ret = 1;
 879                 for (i = 1; i < cc->cluster_size; i++) {
 880                         block_t blkaddr;
 881
 882                         blkaddr = data_blkaddr(dn.inode,
 883                                         dn.node_page, dn.ofs_in_node + i);
 884                         if (compr) {
 885                                 if (__is_valid_data_blkaddr(blkaddr))
 886                                         ret++;
 887                         } else {
 888                                 if (blkaddr != NULL_ADDR)
 889                                         ret++;
 890                         }
 891                 }
 892         }
 893 fail:
 894         f2fs_put_dnode(&dn);
 895         return ret;
 896 }
 897
 898 /* return # of compressed blocks in compressed cluster */
 899 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 900 {
 901         return __f2fs_cluster_blocks(cc, true);
 902 }
 903
 904 /* return # of valid blocks in compressed cluster */
 905 static int f2fs_cluster_blocks(struct compress_ctx *cc)
 906 {
 907         return __f2fs_cluster_blocks(cc, false);
 908 }
 909
 910 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 911 {
 912         struct compress_ctx cc = {
 913                 .inode = inode,
 914                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
 915                 .cluster_size = F2FS_I(inode)->i_cluster_size,
 916                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
 917         };
 918
 919         return f2fs_cluster_blocks(&cc);
 920 }
 921
 922 static bool cluster_may_compress(struct compress_ctx *cc)
 923 {
 924         if (!f2fs_compressed_file(cc->inode))
 925                 return false;
 926         if (f2fs_is_atomic_file(cc->inode))
 927                 return false;
 928         if (f2fs_is_mmap_file(cc->inode))
 929                 return false;
 930         if (!f2fs_cluster_is_full(cc))
 931                 return false;
 932         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
 933                 return false;
 934         return __cluster_may_compress(cc);
 935 }
 936
 937 static void set_cluster_writeback(struct compress_ctx *cc)
 938 {
 939         int i;
 940
 941         for (i = 0; i < cc->cluster_size; i++) {
 942                 if (cc->rpages[i])
 943                         set_page_writeback(cc->rpages[i]);
 944         }
 945 }
 946
 947 static void set_cluster_dirty(struct compress_ctx *cc)
 948 {
 949         int i;
 950
 951         for (i = 0; i < cc->cluster_size; i++)
 952                 if (cc->rpages[i])
 953                         set_page_dirty(cc->rpages[i]);
 954 }
 955
 956 static int prepare_compress_overwrite(struct compress_ctx *cc,
 957                 struct page **pagep, pgoff_t index, void **fsdata)
 958 {
 959         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 960         struct address_space *mapping = cc->inode->i_mapping;
 961         struct page *page;
 962         struct dnode_of_data dn;
 963         sector_t last_block_in_bio;
 964         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
 965         pgoff_t start_idx = start_idx_of_cluster(cc);
 966         int i, ret;
 967         bool prealloc;
 968
 969 retry:
 970         ret = f2fs_cluster_blocks(cc);
 971         if (ret <= 0)
 972                 return ret;
 973
 974         /* compressed case */
 975         prealloc = (ret < cc->cluster_size);
 976
 977         ret = f2fs_init_compress_ctx(cc);
 978         if (ret)
 979                 return ret;
 980
 981         /* keep page reference to avoid page reclaim */
 982         for (i = 0; i < cc->cluster_size; i++) {
 983                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
 984                                                         fgp_flag, GFP_NOFS);
 985                 if (!page) {
 986                         ret = -ENOMEM;
 987                         goto unlock_pages;
 988                 }
 989
 990                 if (PageUptodate(page))
 991                         unlock_page(page);
 992                 else
 993                         f2fs_compress_ctx_add_page(cc, page);
 994         }
 995
 996         if (!f2fs_cluster_is_empty(cc)) {
 997                 struct bio *bio = NULL;
 998
 999                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1000                                         &last_block_in_bio, false, true);
1001                 f2fs_destroy_compress_ctx(cc);
1002                 if (ret)
1003                         goto release_pages;
1004                 if (bio)
1005                         f2fs_submit_bio(sbi, bio, DATA);
1006
1007                 ret = f2fs_init_compress_ctx(cc);
1008                 if (ret)
1009                         goto release_pages;
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                 f2fs_bug_on(sbi, !page);
1017
1018                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1019
1020                 f2fs_compress_ctx_add_page(cc, page);
1021                 f2fs_put_page(page, 0);
1022
1023                 if (!PageUptodate(page)) {
1024                         f2fs_unlock_rpages(cc, i + 1);
1025                         f2fs_put_rpages_mapping(mapping, start_idx,
1026                                         cc->cluster_size);
1027                         f2fs_destroy_compress_ctx(cc);
1028                         goto retry;
1029                 }
1030         }
1031
1032         if (prealloc) {
1033                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
1034
1035                 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1036
1037                 for (i = cc->cluster_size - 1; i > 0; i--) {
1038                         ret = f2fs_get_block(&dn, start_idx + i);
1039                         if (ret) {
1040                                 i = cc->cluster_size;
1041                                 break;
1042                         }
1043
1044                         if (dn.data_blkaddr != NEW_ADDR)
1045                                 break;
1046                 }
1047
1048                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
1049         }
1050
1051         if (likely(!ret)) {
1052                 *fsdata = cc->rpages;
1053                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1054                 return cc->cluster_size;
1055         }
1056
1057 unlock_pages:
1058         f2fs_unlock_rpages(cc, i);
1059 release_pages:
1060         f2fs_put_rpages_mapping(mapping, start_idx, i);
1061         f2fs_destroy_compress_ctx(cc);
1062         return ret;
1063 }
1064
1065 int f2fs_prepare_compress_overwrite(struct inode *inode,
1066                 struct page **pagep, pgoff_t index, void **fsdata)
1067 {
1068         struct compress_ctx cc = {
1069                 .inode = inode,
1070                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1071                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1072                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1073                 .rpages = NULL,
1074                 .nr_rpages = 0,
1075         };
1076
1077         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1078 }
1079
1080 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1081                                         pgoff_t index, unsigned copied)
1082
1083 {
1084         struct compress_ctx cc = {
1085                 .inode = inode,
1086                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1087                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1088                 .rpages = fsdata,
1089         };
1090         bool first_index = (index == cc.rpages[0]->index);
1091
1092         if (copied)
1093                 set_cluster_dirty(&cc);
1094
1095         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1096         f2fs_destroy_compress_ctx(&cc);
1097
1098         return first_index;
1099 }
1100
1101 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1102 {
1103         void *fsdata = NULL;
1104         struct page *pagep;
1105         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1106         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1107                                                         log_cluster_size;
1108         int err;
1109
1110         err = f2fs_is_compressed_cluster(inode, start_idx);
1111         if (err < 0)
1112                 return err;
1113
1114         /* truncate normal cluster */
1115         if (!err)
1116                 return f2fs_do_truncate_blocks(inode, from, lock);
1117
1118         /* truncate compressed cluster */
1119         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1120                                                 start_idx, &fsdata);
1121
1122         /* should not be a normal cluster */
1123         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1124
1125         if (err <= 0)
1126                 return err;
1127
1128         if (err > 0) {
1129                 struct page **rpages = fsdata;
1130                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1131                 int i;
1132
1133                 for (i = cluster_size - 1; i >= 0; i--) {
1134                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1135
1136                         if (from <= start) {
1137                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1138                         } else {
1139                                 zero_user_segment(rpages[i], from - start,
1140                                                                 PAGE_SIZE);
1141                                 break;
1142                         }
1143                 }
1144
1145                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1146         }
1147         return 0;
1148 }
1149
1150 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1151                                         int *submitted,
1152                                         struct writeback_control *wbc,
1153                                         enum iostat_type io_type)
1154 {
1155         struct inode *inode = cc->inode;
1156         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1157         struct f2fs_inode_info *fi = F2FS_I(inode);
1158         struct f2fs_io_info fio = {
1159                 .sbi = sbi,
1160                 .ino = cc->inode->i_ino,
1161                 .type = DATA,
1162                 .op = REQ_OP_WRITE,
1163                 .op_flags = wbc_to_write_flags(wbc),
1164                 .old_blkaddr = NEW_ADDR,
1165                 .page = NULL,
1166                 .encrypted_page = NULL,
1167                 .compressed_page = NULL,
1168                 .submitted = false,
1169                 .io_type = io_type,
1170                 .io_wbc = wbc,
1171                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1172         };
1173         struct dnode_of_data dn;
1174         struct node_info ni;
1175         struct compress_io_ctx *cic;
1176         pgoff_t start_idx = start_idx_of_cluster(cc);
1177         unsigned int last_index = cc->cluster_size - 1;
1178         loff_t psize;
1179         int i, err;
1180
1181         if (IS_NOQUOTA(inode)) {
1182                 /*
1183                  * We need to wait for node_write to avoid block allocation during
1184                  * checkpoint. This can only happen to quota writes which can cause
1185                  * the below discard race condition.
1186                  */
1187                 down_read(&sbi->node_write);
1188         } else if (!f2fs_trylock_op(sbi)) {
1189                 goto out_free;
1190         }
1191
1192         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1193
1194         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1195         if (err)
1196                 goto out_unlock_op;
1197
1198         for (i = 0; i < cc->cluster_size; i++) {
1199                 if (data_blkaddr(dn.inode, dn.node_page,
1200                                         dn.ofs_in_node + i) == NULL_ADDR)
1201                         goto out_put_dnode;
1202         }
1203
1204         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1205
1206         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1207         if (err)
1208                 goto out_put_dnode;
1209
1210         fio.version = ni.version;
1211
1212         cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1213         if (!cic)
1214                 goto out_put_dnode;
1215
1216         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1217         cic->inode = inode;
1218         atomic_set(&cic->pending_pages, cc->nr_cpages);
1219         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1220         if (!cic->rpages)
1221                 goto out_put_cic;
1222
1223         cic->nr_rpages = cc->cluster_size;
1224
1225         for (i = 0; i < cc->nr_cpages; i++) {
1226                 f2fs_set_compressed_page(cc->cpages[i], inode,
1227                                         cc->rpages[i + 1]->index, cic);
1228                 fio.compressed_page = cc->cpages[i];
1229
1230                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1231                                                 dn.ofs_in_node + i + 1);
1232
1233                 /* wait for GCed page writeback via META_MAPPING */
1234                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1235
1236                 if (fio.encrypted) {
1237                         fio.page = cc->rpages[i + 1];
1238                         err = f2fs_encrypt_one_page(&fio);
1239                         if (err)
1240                                 goto out_destroy_crypt;
1241                         cc->cpages[i] = fio.encrypted_page;
1242                 }
1243         }
1244
1245         set_cluster_writeback(cc);
1246
1247         for (i = 0; i < cc->cluster_size; i++)
1248                 cic->rpages[i] = cc->rpages[i];
1249
1250         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1251                 block_t blkaddr;
1252
1253                 blkaddr = f2fs_data_blkaddr(&dn);
1254                 fio.page = cc->rpages[i];
1255                 fio.old_blkaddr = blkaddr;
1256
1257                 /* cluster header */
1258                 if (i == 0) {
1259                         if (blkaddr == COMPRESS_ADDR)
1260                                 fio.compr_blocks++;
1261                         if (__is_valid_data_blkaddr(blkaddr))
1262                                 f2fs_invalidate_blocks(sbi, blkaddr);
1263                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1264                         goto unlock_continue;
1265                 }
1266
1267                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1268                         fio.compr_blocks++;
1269
1270                 if (i > cc->nr_cpages) {
1271                         if (__is_valid_data_blkaddr(blkaddr)) {
1272                                 f2fs_invalidate_blocks(sbi, blkaddr);
1273                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1274                         }
1275                         goto unlock_continue;
1276                 }
1277
1278                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1279
1280                 if (fio.encrypted)
1281                         fio.encrypted_page = cc->cpages[i - 1];
1282                 else
1283                         fio.compressed_page = cc->cpages[i - 1];
1284
1285                 cc->cpages[i - 1] = NULL;
1286                 f2fs_outplace_write_data(&dn, &fio);
1287                 (*submitted)++;
1288 unlock_continue:
1289                 inode_dec_dirty_pages(cc->inode);
1290                 unlock_page(fio.page);
1291         }
1292
1293         if (fio.compr_blocks)
1294                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1295         f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1296
1297         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1298         if (cc->cluster_idx == 0)
1299                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1300
1301         f2fs_put_dnode(&dn);
1302         if (IS_NOQUOTA(inode))
1303                 up_read(&sbi->node_write);
1304         else
1305                 f2fs_unlock_op(sbi);
1306
1307         spin_lock(&fi->i_size_lock);
1308         if (fi->last_disk_size < psize)
1309                 fi->last_disk_size = psize;
1310         spin_unlock(&fi->i_size_lock);
1311
1312         f2fs_put_rpages(cc);
1313         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1314         cc->cpages = NULL;
1315         f2fs_destroy_compress_ctx(cc);
1316         return 0;
1317
1318 out_destroy_crypt:
1319         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1320
1321         for (--i; i >= 0; i--)
1322                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1323         for (i = 0; i < cc->nr_cpages; i++) {
1324                 if (!cc->cpages[i])
1325                         continue;
1326                 f2fs_put_page(cc->cpages[i], 1);
1327         }
1328 out_put_cic:
1329         kmem_cache_free(cic_entry_slab, cic);
1330 out_put_dnode:
1331         f2fs_put_dnode(&dn);
1332 out_unlock_op:
1333         if (IS_NOQUOTA(inode))
1334                 up_read(&sbi->node_write);
1335         else
1336                 f2fs_unlock_op(sbi);
1337 out_free:
1338         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1339         cc->cpages = NULL;
1340         return -EAGAIN;
1341 }
1342
1343 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1344 {
1345         struct f2fs_sb_info *sbi = bio->bi_private;
1346         struct compress_io_ctx *cic =
1347                         (struct compress_io_ctx *)page_private(page);
1348         int i;
1349
1350         if (unlikely(bio->bi_status))
1351                 mapping_set_error(cic->inode->i_mapping, -EIO);
1352
1353         f2fs_compress_free_page(page);
1354
1355         dec_page_count(sbi, F2FS_WB_DATA);
1356
1357         if (atomic_dec_return(&cic->pending_pages))
1358                 return;
1359
1360         for (i = 0; i < cic->nr_rpages; i++) {
1361                 WARN_ON(!cic->rpages[i]);
1362                 clear_cold_data(cic->rpages[i]);
1363                 end_page_writeback(cic->rpages[i]);
1364         }
1365
1366         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1367         kmem_cache_free(cic_entry_slab, cic);
1368 }
1369
1370 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1371                                         int *submitted,
1372                                         struct writeback_control *wbc,
1373                                         enum iostat_type io_type)
1374 {
1375         struct address_space *mapping = cc->inode->i_mapping;
1376         int _submitted, compr_blocks, ret;
1377         int i = -1, err = 0;
1378
1379         compr_blocks = f2fs_compressed_blocks(cc);
1380         if (compr_blocks < 0) {
1381                 err = compr_blocks;
1382                 goto out_err;
1383         }
1384
1385         for (i = 0; i < cc->cluster_size; i++) {
1386                 if (!cc->rpages[i])
1387                         continue;
1388 retry_write:
1389                 if (cc->rpages[i]->mapping != mapping) {
1390                         unlock_page(cc->rpages[i]);
1391                         continue;
1392                 }
1393
1394                 BUG_ON(!PageLocked(cc->rpages[i]));
1395
1396                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1397                                                 NULL, NULL, wbc, io_type,
1398                                                 compr_blocks);
1399                 if (ret) {
1400                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1401                                 unlock_page(cc->rpages[i]);
1402                                 ret = 0;
1403                         } else if (ret == -EAGAIN) {
1404                                 /*
1405                                  * for quota file, just redirty left pages to
1406                                  * avoid deadlock caused by cluster update race
1407                                  * from foreground operation.
1408                                  */
1409                                 if (IS_NOQUOTA(cc->inode)) {
1410                                         err = 0;
1411                                         goto out_err;
1412                                 }
1413                                 ret = 0;
1414                                 cond_resched();
1415                                 congestion_wait(BLK_RW_ASYNC,
1416                                                 DEFAULT_IO_TIMEOUT);
1417                                 lock_page(cc->rpages[i]);
1418
1419                                 if (!PageDirty(cc->rpages[i])) {
1420                                         unlock_page(cc->rpages[i]);
1421                                         continue;
1422                                 }
1423
1424                                 clear_page_dirty_for_io(cc->rpages[i]);
1425                                 goto retry_write;
1426                         }
1427                         err = ret;
1428                         goto out_err;
1429                 }
1430
1431                 *submitted += _submitted;
1432         }
1433         return 0;
1434 out_err:
1435         for (++i; i < cc->cluster_size; i++) {
1436                 if (!cc->rpages[i])
1437                         continue;
1438                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1439                 unlock_page(cc->rpages[i]);
1440         }
1441         return err;
1442 }
1443
1444 int f2fs_write_multi_pages(struct compress_ctx *cc,
1445                                         int *submitted,
1446                                         struct writeback_control *wbc,
1447                                         enum iostat_type io_type)
1448 {
1449         int err;
1450
1451         *submitted = 0;
1452         if (cluster_may_compress(cc)) {
1453                 err = f2fs_compress_pages(cc);
1454                 if (err == -EAGAIN) {
1455                         goto write;
1456                 } else if (err) {
1457                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1458                         goto destroy_out;
1459                 }
1460
1461                 err = f2fs_write_compressed_pages(cc, submitted,
1462                                                         wbc, io_type);
1463                 if (!err)
1464                         return 0;
1465                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1466         }
1467 write:
1468         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1469
1470         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1471         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1472 destroy_out:
1473         f2fs_destroy_compress_ctx(cc);
1474         return err;
1475 }
1476
1477 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1478 {
1479         struct decompress_io_ctx *dic;
1480         pgoff_t start_idx = start_idx_of_cluster(cc);
1481         int i;
1482
1483         dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1484         if (!dic)
1485                 return ERR_PTR(-ENOMEM);
1486
1487         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1488         if (!dic->rpages) {
1489                 kmem_cache_free(dic_entry_slab, dic);
1490                 return ERR_PTR(-ENOMEM);
1491         }
1492
1493         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1494         dic->inode = cc->inode;
1495         atomic_set(&dic->pending_pages, cc->nr_cpages);
1496         dic->cluster_idx = cc->cluster_idx;
1497         dic->cluster_size = cc->cluster_size;
1498         dic->log_cluster_size = cc->log_cluster_size;
1499         dic->nr_cpages = cc->nr_cpages;
1500         dic->failed = false;
1501
1502         for (i = 0; i < dic->cluster_size; i++)
1503                 dic->rpages[i] = cc->rpages[i];
1504         dic->nr_rpages = cc->cluster_size;
1505
1506         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1507         if (!dic->cpages)
1508                 goto out_free;
1509
1510         for (i = 0; i < dic->nr_cpages; i++) {
1511                 struct page *page;
1512
1513                 page = f2fs_compress_alloc_page();
1514                 if (!page)
1515                         goto out_free;
1516
1517                 f2fs_set_compressed_page(page, cc->inode,
1518                                         start_idx + i + 1, dic);
1519                 dic->cpages[i] = page;
1520         }
1521
1522         return dic;
1523
1524 out_free:
1525         f2fs_free_dic(dic);
1526         return ERR_PTR(-ENOMEM);
1527 }
1528
1529 void f2fs_free_dic(struct decompress_io_ctx *dic)
1530 {
1531         int i;
1532
1533         if (dic->tpages) {
1534                 for (i = 0; i < dic->cluster_size; i++) {
1535                         if (dic->rpages[i])
1536                                 continue;
1537                         if (!dic->tpages[i])
1538                                 continue;
1539                         f2fs_compress_free_page(dic->tpages[i]);
1540                 }
1541                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1542         }
1543
1544         if (dic->cpages) {
1545                 for (i = 0; i < dic->nr_cpages; i++) {
1546                         if (!dic->cpages[i])
1547                                 continue;
1548                         f2fs_compress_free_page(dic->cpages[i]);
1549                 }
1550                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1551         }
1552
1553         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1554         kmem_cache_free(dic_entry_slab, dic);
1555 }
1556
1557 void f2fs_decompress_end_io(struct page **rpages,
1558                         unsigned int cluster_size, bool err, bool verity)
1559 {
1560         int i;
1561
1562         for (i = 0; i < cluster_size; i++) {
1563                 struct page *rpage = rpages[i];
1564
1565                 if (!rpage)
1566                         continue;
1567
1568                 if (err || PageError(rpage))
1569                         goto clear_uptodate;
1570
1571                 if (!verity || fsverity_verify_page(rpage)) {
1572                         SetPageUptodate(rpage);
1573                         goto unlock;
1574                 }
1575 clear_uptodate:
1576                 ClearPageUptodate(rpage);
1577                 ClearPageError(rpage);
1578 unlock:
1579                 unlock_page(rpage);
1580         }
1581 }
1582
1583 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1584 {
1585         dev_t dev = sbi->sb->s_bdev->bd_dev;
1586         char slab_name[32];
1587
1588         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1589
1590         sbi->page_array_slab_size = sizeof(struct page *) <<
1591                                         F2FS_OPTION(sbi).compress_log_size;
1592
1593         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1594                                         sbi->page_array_slab_size);
1595         if (!sbi->page_array_slab)
1596                 return -ENOMEM;
1597         return 0;
1598 }
1599
1600 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1601 {
1602         kmem_cache_destroy(sbi->page_array_slab);
1603 }
1604
1605 static int __init f2fs_init_cic_cache(void)
1606 {
1607         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1608                                         sizeof(struct compress_io_ctx));
1609         if (!cic_entry_slab)
1610                 return -ENOMEM;
1611         return 0;
1612 }
1613
1614 static void f2fs_destroy_cic_cache(void)
1615 {
1616         kmem_cache_destroy(cic_entry_slab);
1617 }
1618
1619 static int __init f2fs_init_dic_cache(void)
1620 {
1621         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1622                                         sizeof(struct decompress_io_ctx));
1623         if (!dic_entry_slab)
1624                 return -ENOMEM;
1625         return 0;
1626 }
1627
1628 static void f2fs_destroy_dic_cache(void)
1629 {
1630         kmem_cache_destroy(dic_entry_slab);
1631 }
1632
1633 int __init f2fs_init_compress_cache(void)
1634 {
1635         int err;
1636
1637         err = f2fs_init_cic_cache();
1638         if (err)
1639                 goto out;
1640         err = f2fs_init_dic_cache();
1641         if (err)
1642                 goto free_cic;
1643         return 0;
1644 free_cic:
1645         f2fs_destroy_cic_cache();
1646 out:
1647         return -ENOMEM;
1648 }
1649
1650 void f2fs_destroy_compress_cache(void)
1651 {
1652         f2fs_destroy_dic_cache();
1653         f2fs_destroy_cic_cache();
1654 }