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         u32 chksum = 0;
 606         int i, ret;
 607
 608         trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
 609                                 cc->cluster_size, fi->i_compress_algorithm);
 610
 611         if (cops->init_compress_ctx) {
 612                 ret = cops->init_compress_ctx(cc);
 613                 if (ret)
 614                         goto out;
 615         }
 616
 617         max_len = COMPRESS_HEADER_SIZE + cc->clen;
 618         cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 619
 620         cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 621         if (!cc->cpages) {
 622                 ret = -ENOMEM;
 623                 goto destroy_compress_ctx;
 624         }
 625
 626         for (i = 0; i < cc->nr_cpages; i++) {
 627                 cc->cpages[i] = f2fs_compress_alloc_page();
 628                 if (!cc->cpages[i]) {
 629                         ret = -ENOMEM;
 630                         goto out_free_cpages;
 631                 }
 632         }
 633
 634         cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 635         if (!cc->rbuf) {
 636                 ret = -ENOMEM;
 637                 goto out_free_cpages;
 638         }
 639
 640         cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 641         if (!cc->cbuf) {
 642                 ret = -ENOMEM;
 643                 goto out_vunmap_rbuf;
 644         }
 645
 646         ret = cops->compress_pages(cc);
 647         if (ret)
 648                 goto out_vunmap_cbuf;
 649
 650         max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
 651
 652         if (cc->clen > max_len) {
 653                 ret = -EAGAIN;
 654                 goto out_vunmap_cbuf;
 655         }
 656
 657         cc->cbuf->clen = cpu_to_le32(cc->clen);
 658
 659         if (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)
 660                 chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
 661                                         cc->cbuf->cdata, cc->clen);
 662         cc->cbuf->chksum = cpu_to_le32(chksum);
 663
 664         for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 665                 cc->cbuf->reserved[i] = cpu_to_le32(0);
 666
 667         new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
 668
 669         /* Now we're going to cut unnecessary tail pages */
 670         new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
 671         if (!new_cpages) {
 672                 ret = -ENOMEM;
 673                 goto out_vunmap_cbuf;
 674         }
 675
 676         /* zero out any unused part of the last page */
 677         memset(&cc->cbuf->cdata[cc->clen], 0,
 678                         (new_nr_cpages * PAGE_SIZE) -
 679                         (cc->clen + COMPRESS_HEADER_SIZE));
 680
 681         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 682         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 683
 684         for (i = 0; i < cc->nr_cpages; i++) {
 685                 if (i < new_nr_cpages) {
 686                         new_cpages[i] = cc->cpages[i];
 687                         continue;
 688                 }
 689                 f2fs_compress_free_page(cc->cpages[i]);
 690                 cc->cpages[i] = NULL;
 691         }
 692
 693         if (cops->destroy_compress_ctx)
 694                 cops->destroy_compress_ctx(cc);
 695
 696         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 697         cc->cpages = new_cpages;
 698         cc->nr_cpages = new_nr_cpages;
 699
 700         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 701                                                         cc->clen, ret);
 702         return 0;
 703
 704 out_vunmap_cbuf:
 705         vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 706 out_vunmap_rbuf:
 707         vm_unmap_ram(cc->rbuf, cc->cluster_size);
 708 out_free_cpages:
 709         for (i = 0; i < cc->nr_cpages; i++) {
 710                 if (cc->cpages[i])
 711                         f2fs_compress_free_page(cc->cpages[i]);
 712         }
 713         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 714         cc->cpages = NULL;
 715 destroy_compress_ctx:
 716         if (cops->destroy_compress_ctx)
 717                 cops->destroy_compress_ctx(cc);
 718 out:
 719         trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 720                                                         cc->clen, ret);
 721         return ret;
 722 }
 723
 724 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 725 {
 726         struct decompress_io_ctx *dic =
 727                         (struct decompress_io_ctx *)page_private(page);
 728         struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
 729         struct f2fs_inode_info *fi= F2FS_I(dic->inode);
 730         const struct f2fs_compress_ops *cops =
 731                         f2fs_cops[fi->i_compress_algorithm];
 732         int ret;
 733         int i;
 734
 735         dec_page_count(sbi, F2FS_RD_DATA);
 736
 737         if (bio->bi_status || PageError(page))
 738                 dic->failed = true;
 739
 740         if (atomic_dec_return(&dic->pending_pages))
 741                 return;
 742
 743         trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
 744                                 dic->cluster_size, fi->i_compress_algorithm);
 745
 746         /* submit partial compressed pages */
 747         if (dic->failed) {
 748                 ret = -EIO;
 749                 goto out_free_dic;
 750         }
 751
 752         dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
 753         if (!dic->tpages) {
 754                 ret = -ENOMEM;
 755                 goto out_free_dic;
 756         }
 757
 758         for (i = 0; i < dic->cluster_size; i++) {
 759                 if (dic->rpages[i]) {
 760                         dic->tpages[i] = dic->rpages[i];
 761                         continue;
 762                 }
 763
 764                 dic->tpages[i] = f2fs_compress_alloc_page();
 765                 if (!dic->tpages[i]) {
 766                         ret = -ENOMEM;
 767                         goto out_free_dic;
 768                 }
 769         }
 770
 771         if (cops->init_decompress_ctx) {
 772                 ret = cops->init_decompress_ctx(dic);
 773                 if (ret)
 774                         goto out_free_dic;
 775         }
 776
 777         dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
 778         if (!dic->rbuf) {
 779                 ret = -ENOMEM;
 780                 goto destroy_decompress_ctx;
 781         }
 782
 783         dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
 784         if (!dic->cbuf) {
 785                 ret = -ENOMEM;
 786                 goto out_vunmap_rbuf;
 787         }
 788
 789         dic->clen = le32_to_cpu(dic->cbuf->clen);
 790         dic->rlen = PAGE_SIZE << dic->log_cluster_size;
 791
 792         if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
 793                 ret = -EFSCORRUPTED;
 794                 goto out_vunmap_cbuf;
 795         }
 796
 797         ret = cops->decompress_pages(dic);
 798
 799         if (!ret && (fi->i_compress_flag & 1 << COMPRESS_CHKSUM)) {
 800                 u32 provided = le32_to_cpu(dic->cbuf->chksum);
 801                 u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
 802
 803                 if (provided != calculated) {
 804                         if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 805                                 set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 806                                 printk_ratelimited(
 807                                         "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
 808                                         KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
 809                                         provided, calculated);
 810                         }
 811                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 812                 }
 813         }
 814
 815 out_vunmap_cbuf:
 816         vm_unmap_ram(dic->cbuf, dic->nr_cpages);
 817 out_vunmap_rbuf:
 818         vm_unmap_ram(dic->rbuf, dic->cluster_size);
 819 destroy_decompress_ctx:
 820         if (cops->destroy_decompress_ctx)
 821                 cops->destroy_decompress_ctx(dic);
 822 out_free_dic:
 823         if (!verity)
 824                 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
 825                                                                 ret, false);
 826
 827         trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
 828                                                         dic->clen, ret);
 829         if (!verity)
 830                 f2fs_free_dic(dic);
 831 }
 832
 833 static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
 834 {
 835         if (cc->cluster_idx == NULL_CLUSTER)
 836                 return true;
 837         return cc->cluster_idx == cluster_idx(cc, index);
 838 }
 839
 840 bool f2fs_cluster_is_empty(struct compress_ctx *cc)
 841 {
 842         return cc->nr_rpages == 0;
 843 }
 844
 845 static bool f2fs_cluster_is_full(struct compress_ctx *cc)
 846 {
 847         return cc->cluster_size == cc->nr_rpages;
 848 }
 849
 850 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
 851 {
 852         if (f2fs_cluster_is_empty(cc))
 853                 return true;
 854         return is_page_in_cluster(cc, index);
 855 }
 856
 857 static bool __cluster_may_compress(struct compress_ctx *cc)
 858 {
 859         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 860         loff_t i_size = i_size_read(cc->inode);
 861         unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
 862         int i;
 863
 864         for (i = 0; i < cc->cluster_size; i++) {
 865                 struct page *page = cc->rpages[i];
 866
 867                 f2fs_bug_on(sbi, !page);
 868
 869                 if (unlikely(f2fs_cp_error(sbi)))
 870                         return false;
 871                 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 872                         return false;
 873
 874                 /* beyond EOF */
 875                 if (page->index >= nr_pages)
 876                         return false;
 877         }
 878         return true;
 879 }
 880
 881 static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
 882 {
 883         struct dnode_of_data dn;
 884         int ret;
 885
 886         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
 887         ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
 888                                                         LOOKUP_NODE);
 889         if (ret) {
 890                 if (ret == -ENOENT)
 891                         ret = 0;
 892                 goto fail;
 893         }
 894
 895         if (dn.data_blkaddr == COMPRESS_ADDR) {
 896                 int i;
 897
 898                 ret = 1;
 899                 for (i = 1; i < cc->cluster_size; i++) {
 900                         block_t blkaddr;
 901
 902                         blkaddr = data_blkaddr(dn.inode,
 903                                         dn.node_page, dn.ofs_in_node + i);
 904                         if (compr) {
 905                                 if (__is_valid_data_blkaddr(blkaddr))
 906                                         ret++;
 907                         } else {
 908                                 if (blkaddr != NULL_ADDR)
 909                                         ret++;
 910                         }
 911                 }
 912         }
 913 fail:
 914         f2fs_put_dnode(&dn);
 915         return ret;
 916 }
 917
 918 /* return # of compressed blocks in compressed cluster */
 919 static int f2fs_compressed_blocks(struct compress_ctx *cc)
 920 {
 921         return __f2fs_cluster_blocks(cc, true);
 922 }
 923
 924 /* return # of valid blocks in compressed cluster */
 925 static int f2fs_cluster_blocks(struct compress_ctx *cc)
 926 {
 927         return __f2fs_cluster_blocks(cc, false);
 928 }
 929
 930 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
 931 {
 932         struct compress_ctx cc = {
 933                 .inode = inode,
 934                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
 935                 .cluster_size = F2FS_I(inode)->i_cluster_size,
 936                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
 937         };
 938
 939         return f2fs_cluster_blocks(&cc);
 940 }
 941
 942 static bool cluster_may_compress(struct compress_ctx *cc)
 943 {
 944         if (!f2fs_need_compress_data(cc->inode))
 945                 return false;
 946         if (f2fs_is_atomic_file(cc->inode))
 947                 return false;
 948         if (f2fs_is_mmap_file(cc->inode))
 949                 return false;
 950         if (!f2fs_cluster_is_full(cc))
 951                 return false;
 952         if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
 953                 return false;
 954         return __cluster_may_compress(cc);
 955 }
 956
 957 static void set_cluster_writeback(struct compress_ctx *cc)
 958 {
 959         int i;
 960
 961         for (i = 0; i < cc->cluster_size; i++) {
 962                 if (cc->rpages[i])
 963                         set_page_writeback(cc->rpages[i]);
 964         }
 965 }
 966
 967 static void set_cluster_dirty(struct compress_ctx *cc)
 968 {
 969         int i;
 970
 971         for (i = 0; i < cc->cluster_size; i++)
 972                 if (cc->rpages[i])
 973                         set_page_dirty(cc->rpages[i]);
 974 }
 975
 976 static int prepare_compress_overwrite(struct compress_ctx *cc,
 977                 struct page **pagep, pgoff_t index, void **fsdata)
 978 {
 979         struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 980         struct address_space *mapping = cc->inode->i_mapping;
 981         struct page *page;
 982         struct dnode_of_data dn;
 983         sector_t last_block_in_bio;
 984         unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
 985         pgoff_t start_idx = start_idx_of_cluster(cc);
 986         int i, ret;
 987         bool prealloc;
 988
 989 retry:
 990         ret = f2fs_cluster_blocks(cc);
 991         if (ret <= 0)
 992                 return ret;
 993
 994         /* compressed case */
 995         prealloc = (ret < cc->cluster_size);
 996
 997         ret = f2fs_init_compress_ctx(cc);
 998         if (ret)
 999                 return ret;
1000
1001         /* keep page reference to avoid page reclaim */
1002         for (i = 0; i < cc->cluster_size; i++) {
1003                 page = f2fs_pagecache_get_page(mapping, start_idx + i,
1004                                                         fgp_flag, GFP_NOFS);
1005                 if (!page) {
1006                         ret = -ENOMEM;
1007                         goto unlock_pages;
1008                 }
1009
1010                 if (PageUptodate(page))
1011                         unlock_page(page);
1012                 else
1013                         f2fs_compress_ctx_add_page(cc, page);
1014         }
1015
1016         if (!f2fs_cluster_is_empty(cc)) {
1017                 struct bio *bio = NULL;
1018
1019                 ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
1020                                         &last_block_in_bio, false, true);
1021                 f2fs_destroy_compress_ctx(cc);
1022                 if (ret)
1023                         goto release_pages;
1024                 if (bio)
1025                         f2fs_submit_bio(sbi, bio, DATA);
1026
1027                 ret = f2fs_init_compress_ctx(cc);
1028                 if (ret)
1029                         goto release_pages;
1030         }
1031
1032         for (i = 0; i < cc->cluster_size; i++) {
1033                 f2fs_bug_on(sbi, cc->rpages[i]);
1034
1035                 page = find_lock_page(mapping, start_idx + i);
1036                 f2fs_bug_on(sbi, !page);
1037
1038                 f2fs_wait_on_page_writeback(page, DATA, true, true);
1039
1040                 f2fs_compress_ctx_add_page(cc, page);
1041                 f2fs_put_page(page, 0);
1042
1043                 if (!PageUptodate(page)) {
1044                         f2fs_unlock_rpages(cc, i + 1);
1045                         f2fs_put_rpages_mapping(mapping, start_idx,
1046                                         cc->cluster_size);
1047                         f2fs_destroy_compress_ctx(cc);
1048                         goto retry;
1049                 }
1050         }
1051
1052         if (prealloc) {
1053                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
1054
1055                 set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1056
1057                 for (i = cc->cluster_size - 1; i > 0; i--) {
1058                         ret = f2fs_get_block(&dn, start_idx + i);
1059                         if (ret) {
1060                                 i = cc->cluster_size;
1061                                 break;
1062                         }
1063
1064                         if (dn.data_blkaddr != NEW_ADDR)
1065                                 break;
1066                 }
1067
1068                 f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
1069         }
1070
1071         if (likely(!ret)) {
1072                 *fsdata = cc->rpages;
1073                 *pagep = cc->rpages[offset_in_cluster(cc, index)];
1074                 return cc->cluster_size;
1075         }
1076
1077 unlock_pages:
1078         f2fs_unlock_rpages(cc, i);
1079 release_pages:
1080         f2fs_put_rpages_mapping(mapping, start_idx, i);
1081         f2fs_destroy_compress_ctx(cc);
1082         return ret;
1083 }
1084
1085 int f2fs_prepare_compress_overwrite(struct inode *inode,
1086                 struct page **pagep, pgoff_t index, void **fsdata)
1087 {
1088         struct compress_ctx cc = {
1089                 .inode = inode,
1090                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1091                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1092                 .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
1093                 .rpages = NULL,
1094                 .nr_rpages = 0,
1095         };
1096
1097         return prepare_compress_overwrite(&cc, pagep, index, fsdata);
1098 }
1099
1100 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
1101                                         pgoff_t index, unsigned copied)
1102
1103 {
1104         struct compress_ctx cc = {
1105                 .inode = inode,
1106                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
1107                 .cluster_size = F2FS_I(inode)->i_cluster_size,
1108                 .rpages = fsdata,
1109         };
1110         bool first_index = (index == cc.rpages[0]->index);
1111
1112         if (copied)
1113                 set_cluster_dirty(&cc);
1114
1115         f2fs_put_rpages_wbc(&cc, NULL, false, 1);
1116         f2fs_destroy_compress_ctx(&cc);
1117
1118         return first_index;
1119 }
1120
1121 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
1122 {
1123         void *fsdata = NULL;
1124         struct page *pagep;
1125         int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
1126         pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
1127                                                         log_cluster_size;
1128         int err;
1129
1130         err = f2fs_is_compressed_cluster(inode, start_idx);
1131         if (err < 0)
1132                 return err;
1133
1134         /* truncate normal cluster */
1135         if (!err)
1136                 return f2fs_do_truncate_blocks(inode, from, lock);
1137
1138         /* truncate compressed cluster */
1139         err = f2fs_prepare_compress_overwrite(inode, &pagep,
1140                                                 start_idx, &fsdata);
1141
1142         /* should not be a normal cluster */
1143         f2fs_bug_on(F2FS_I_SB(inode), err == 0);
1144
1145         if (err <= 0)
1146                 return err;
1147
1148         if (err > 0) {
1149                 struct page **rpages = fsdata;
1150                 int cluster_size = F2FS_I(inode)->i_cluster_size;
1151                 int i;
1152
1153                 for (i = cluster_size - 1; i >= 0; i--) {
1154                         loff_t start = rpages[i]->index << PAGE_SHIFT;
1155
1156                         if (from <= start) {
1157                                 zero_user_segment(rpages[i], 0, PAGE_SIZE);
1158                         } else {
1159                                 zero_user_segment(rpages[i], from - start,
1160                                                                 PAGE_SIZE);
1161                                 break;
1162                         }
1163                 }
1164
1165                 f2fs_compress_write_end(inode, fsdata, start_idx, true);
1166         }
1167         return 0;
1168 }
1169
1170 static int f2fs_write_compressed_pages(struct compress_ctx *cc,
1171                                         int *submitted,
1172                                         struct writeback_control *wbc,
1173                                         enum iostat_type io_type)
1174 {
1175         struct inode *inode = cc->inode;
1176         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1177         struct f2fs_inode_info *fi = F2FS_I(inode);
1178         struct f2fs_io_info fio = {
1179                 .sbi = sbi,
1180                 .ino = cc->inode->i_ino,
1181                 .type = DATA,
1182                 .op = REQ_OP_WRITE,
1183                 .op_flags = wbc_to_write_flags(wbc),
1184                 .old_blkaddr = NEW_ADDR,
1185                 .page = NULL,
1186                 .encrypted_page = NULL,
1187                 .compressed_page = NULL,
1188                 .submitted = false,
1189                 .io_type = io_type,
1190                 .io_wbc = wbc,
1191                 .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
1192         };
1193         struct dnode_of_data dn;
1194         struct node_info ni;
1195         struct compress_io_ctx *cic;
1196         pgoff_t start_idx = start_idx_of_cluster(cc);
1197         unsigned int last_index = cc->cluster_size - 1;
1198         loff_t psize;
1199         int i, err;
1200
1201         if (IS_NOQUOTA(inode)) {
1202                 /*
1203                  * We need to wait for node_write to avoid block allocation during
1204                  * checkpoint. This can only happen to quota writes which can cause
1205                  * the below discard race condition.
1206                  */
1207                 down_read(&sbi->node_write);
1208         } else if (!f2fs_trylock_op(sbi)) {
1209                 goto out_free;
1210         }
1211
1212         set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
1213
1214         err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
1215         if (err)
1216                 goto out_unlock_op;
1217
1218         for (i = 0; i < cc->cluster_size; i++) {
1219                 if (data_blkaddr(dn.inode, dn.node_page,
1220                                         dn.ofs_in_node + i) == NULL_ADDR)
1221                         goto out_put_dnode;
1222         }
1223
1224         psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
1225
1226         err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
1227         if (err)
1228                 goto out_put_dnode;
1229
1230         fio.version = ni.version;
1231
1232         cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
1233         if (!cic)
1234                 goto out_put_dnode;
1235
1236         cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1237         cic->inode = inode;
1238         atomic_set(&cic->pending_pages, cc->nr_cpages);
1239         cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1240         if (!cic->rpages)
1241                 goto out_put_cic;
1242
1243         cic->nr_rpages = cc->cluster_size;
1244
1245         for (i = 0; i < cc->nr_cpages; i++) {
1246                 f2fs_set_compressed_page(cc->cpages[i], inode,
1247                                         cc->rpages[i + 1]->index, cic);
1248                 fio.compressed_page = cc->cpages[i];
1249
1250                 fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
1251                                                 dn.ofs_in_node + i + 1);
1252
1253                 /* wait for GCed page writeback via META_MAPPING */
1254                 f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
1255
1256                 if (fio.encrypted) {
1257                         fio.page = cc->rpages[i + 1];
1258                         err = f2fs_encrypt_one_page(&fio);
1259                         if (err)
1260                                 goto out_destroy_crypt;
1261                         cc->cpages[i] = fio.encrypted_page;
1262                 }
1263         }
1264
1265         set_cluster_writeback(cc);
1266
1267         for (i = 0; i < cc->cluster_size; i++)
1268                 cic->rpages[i] = cc->rpages[i];
1269
1270         for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
1271                 block_t blkaddr;
1272
1273                 blkaddr = f2fs_data_blkaddr(&dn);
1274                 fio.page = cc->rpages[i];
1275                 fio.old_blkaddr = blkaddr;
1276
1277                 /* cluster header */
1278                 if (i == 0) {
1279                         if (blkaddr == COMPRESS_ADDR)
1280                                 fio.compr_blocks++;
1281                         if (__is_valid_data_blkaddr(blkaddr))
1282                                 f2fs_invalidate_blocks(sbi, blkaddr);
1283                         f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
1284                         goto unlock_continue;
1285                 }
1286
1287                 if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
1288                         fio.compr_blocks++;
1289
1290                 if (i > cc->nr_cpages) {
1291                         if (__is_valid_data_blkaddr(blkaddr)) {
1292                                 f2fs_invalidate_blocks(sbi, blkaddr);
1293                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
1294                         }
1295                         goto unlock_continue;
1296                 }
1297
1298                 f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
1299
1300                 if (fio.encrypted)
1301                         fio.encrypted_page = cc->cpages[i - 1];
1302                 else
1303                         fio.compressed_page = cc->cpages[i - 1];
1304
1305                 cc->cpages[i - 1] = NULL;
1306                 f2fs_outplace_write_data(&dn, &fio);
1307                 (*submitted)++;
1308 unlock_continue:
1309                 inode_dec_dirty_pages(cc->inode);
1310                 unlock_page(fio.page);
1311         }
1312
1313         if (fio.compr_blocks)
1314                 f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
1315         f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
1316
1317         set_inode_flag(cc->inode, FI_APPEND_WRITE);
1318         if (cc->cluster_idx == 0)
1319                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1320
1321         f2fs_put_dnode(&dn);
1322         if (IS_NOQUOTA(inode))
1323                 up_read(&sbi->node_write);
1324         else
1325                 f2fs_unlock_op(sbi);
1326
1327         spin_lock(&fi->i_size_lock);
1328         if (fi->last_disk_size < psize)
1329                 fi->last_disk_size = psize;
1330         spin_unlock(&fi->i_size_lock);
1331
1332         f2fs_put_rpages(cc);
1333         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1334         cc->cpages = NULL;
1335         f2fs_destroy_compress_ctx(cc);
1336         return 0;
1337
1338 out_destroy_crypt:
1339         page_array_free(cc->inode, cic->rpages, cc->cluster_size);
1340
1341         for (--i; i >= 0; i--)
1342                 fscrypt_finalize_bounce_page(&cc->cpages[i]);
1343         for (i = 0; i < cc->nr_cpages; i++) {
1344                 if (!cc->cpages[i])
1345                         continue;
1346                 f2fs_put_page(cc->cpages[i], 1);
1347         }
1348 out_put_cic:
1349         kmem_cache_free(cic_entry_slab, cic);
1350 out_put_dnode:
1351         f2fs_put_dnode(&dn);
1352 out_unlock_op:
1353         if (IS_NOQUOTA(inode))
1354                 up_read(&sbi->node_write);
1355         else
1356                 f2fs_unlock_op(sbi);
1357 out_free:
1358         page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
1359         cc->cpages = NULL;
1360         return -EAGAIN;
1361 }
1362
1363 void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
1364 {
1365         struct f2fs_sb_info *sbi = bio->bi_private;
1366         struct compress_io_ctx *cic =
1367                         (struct compress_io_ctx *)page_private(page);
1368         int i;
1369
1370         if (unlikely(bio->bi_status))
1371                 mapping_set_error(cic->inode->i_mapping, -EIO);
1372
1373         f2fs_compress_free_page(page);
1374
1375         dec_page_count(sbi, F2FS_WB_DATA);
1376
1377         if (atomic_dec_return(&cic->pending_pages))
1378                 return;
1379
1380         for (i = 0; i < cic->nr_rpages; i++) {
1381                 WARN_ON(!cic->rpages[i]);
1382                 clear_cold_data(cic->rpages[i]);
1383                 end_page_writeback(cic->rpages[i]);
1384         }
1385
1386         page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
1387         kmem_cache_free(cic_entry_slab, cic);
1388 }
1389
1390 static int f2fs_write_raw_pages(struct compress_ctx *cc,
1391                                         int *submitted,
1392                                         struct writeback_control *wbc,
1393                                         enum iostat_type io_type)
1394 {
1395         struct address_space *mapping = cc->inode->i_mapping;
1396         int _submitted, compr_blocks, ret;
1397         int i = -1, err = 0;
1398
1399         compr_blocks = f2fs_compressed_blocks(cc);
1400         if (compr_blocks < 0) {
1401                 err = compr_blocks;
1402                 goto out_err;
1403         }
1404
1405         for (i = 0; i < cc->cluster_size; i++) {
1406                 if (!cc->rpages[i])
1407                         continue;
1408 retry_write:
1409                 if (cc->rpages[i]->mapping != mapping) {
1410                         unlock_page(cc->rpages[i]);
1411                         continue;
1412                 }
1413
1414                 BUG_ON(!PageLocked(cc->rpages[i]));
1415
1416                 ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
1417                                                 NULL, NULL, wbc, io_type,
1418                                                 compr_blocks);
1419                 if (ret) {
1420                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
1421                                 unlock_page(cc->rpages[i]);
1422                                 ret = 0;
1423                         } else if (ret == -EAGAIN) {
1424                                 /*
1425                                  * for quota file, just redirty left pages to
1426                                  * avoid deadlock caused by cluster update race
1427                                  * from foreground operation.
1428                                  */
1429                                 if (IS_NOQUOTA(cc->inode)) {
1430                                         err = 0;
1431                                         goto out_err;
1432                                 }
1433                                 ret = 0;
1434                                 cond_resched();
1435                                 congestion_wait(BLK_RW_ASYNC,
1436                                                 DEFAULT_IO_TIMEOUT);
1437                                 lock_page(cc->rpages[i]);
1438
1439                                 if (!PageDirty(cc->rpages[i])) {
1440                                         unlock_page(cc->rpages[i]);
1441                                         continue;
1442                                 }
1443
1444                                 clear_page_dirty_for_io(cc->rpages[i]);
1445                                 goto retry_write;
1446                         }
1447                         err = ret;
1448                         goto out_err;
1449                 }
1450
1451                 *submitted += _submitted;
1452         }
1453         return 0;
1454 out_err:
1455         for (++i; i < cc->cluster_size; i++) {
1456                 if (!cc->rpages[i])
1457                         continue;
1458                 redirty_page_for_writepage(wbc, cc->rpages[i]);
1459                 unlock_page(cc->rpages[i]);
1460         }
1461         return err;
1462 }
1463
1464 int f2fs_write_multi_pages(struct compress_ctx *cc,
1465                                         int *submitted,
1466                                         struct writeback_control *wbc,
1467                                         enum iostat_type io_type)
1468 {
1469         int err;
1470
1471         *submitted = 0;
1472         if (cluster_may_compress(cc)) {
1473                 err = f2fs_compress_pages(cc);
1474                 if (err == -EAGAIN) {
1475                         goto write;
1476                 } else if (err) {
1477                         f2fs_put_rpages_wbc(cc, wbc, true, 1);
1478                         goto destroy_out;
1479                 }
1480
1481                 err = f2fs_write_compressed_pages(cc, submitted,
1482                                                         wbc, io_type);
1483                 if (!err)
1484                         return 0;
1485                 f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
1486         }
1487 write:
1488         f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
1489
1490         err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
1491         f2fs_put_rpages_wbc(cc, wbc, false, 0);
1492 destroy_out:
1493         f2fs_destroy_compress_ctx(cc);
1494         return err;
1495 }
1496
1497 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
1498 {
1499         struct decompress_io_ctx *dic;
1500         pgoff_t start_idx = start_idx_of_cluster(cc);
1501         int i;
1502
1503         dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
1504         if (!dic)
1505                 return ERR_PTR(-ENOMEM);
1506
1507         dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
1508         if (!dic->rpages) {
1509                 kmem_cache_free(dic_entry_slab, dic);
1510                 return ERR_PTR(-ENOMEM);
1511         }
1512
1513         dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
1514         dic->inode = cc->inode;
1515         atomic_set(&dic->pending_pages, cc->nr_cpages);
1516         dic->cluster_idx = cc->cluster_idx;
1517         dic->cluster_size = cc->cluster_size;
1518         dic->log_cluster_size = cc->log_cluster_size;
1519         dic->nr_cpages = cc->nr_cpages;
1520         dic->failed = false;
1521
1522         for (i = 0; i < dic->cluster_size; i++)
1523                 dic->rpages[i] = cc->rpages[i];
1524         dic->nr_rpages = cc->cluster_size;
1525
1526         dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
1527         if (!dic->cpages)
1528                 goto out_free;
1529
1530         for (i = 0; i < dic->nr_cpages; i++) {
1531                 struct page *page;
1532
1533                 page = f2fs_compress_alloc_page();
1534                 if (!page)
1535                         goto out_free;
1536
1537                 f2fs_set_compressed_page(page, cc->inode,
1538                                         start_idx + i + 1, dic);
1539                 dic->cpages[i] = page;
1540         }
1541
1542         return dic;
1543
1544 out_free:
1545         f2fs_free_dic(dic);
1546         return ERR_PTR(-ENOMEM);
1547 }
1548
1549 void f2fs_free_dic(struct decompress_io_ctx *dic)
1550 {
1551         int i;
1552
1553         if (dic->tpages) {
1554                 for (i = 0; i < dic->cluster_size; i++) {
1555                         if (dic->rpages[i])
1556                                 continue;
1557                         if (!dic->tpages[i])
1558                                 continue;
1559                         f2fs_compress_free_page(dic->tpages[i]);
1560                 }
1561                 page_array_free(dic->inode, dic->tpages, dic->cluster_size);
1562         }
1563
1564         if (dic->cpages) {
1565                 for (i = 0; i < dic->nr_cpages; i++) {
1566                         if (!dic->cpages[i])
1567                                 continue;
1568                         f2fs_compress_free_page(dic->cpages[i]);
1569                 }
1570                 page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
1571         }
1572
1573         page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
1574         kmem_cache_free(dic_entry_slab, dic);
1575 }
1576
1577 void f2fs_decompress_end_io(struct page **rpages,
1578                         unsigned int cluster_size, bool err, bool verity)
1579 {
1580         int i;
1581
1582         for (i = 0; i < cluster_size; i++) {
1583                 struct page *rpage = rpages[i];
1584
1585                 if (!rpage)
1586                         continue;
1587
1588                 if (err || PageError(rpage))
1589                         goto clear_uptodate;
1590
1591                 if (!verity || fsverity_verify_page(rpage)) {
1592                         SetPageUptodate(rpage);
1593                         goto unlock;
1594                 }
1595 clear_uptodate:
1596                 ClearPageUptodate(rpage);
1597                 ClearPageError(rpage);
1598 unlock:
1599                 unlock_page(rpage);
1600         }
1601 }
1602
1603 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
1604 {
1605         dev_t dev = sbi->sb->s_bdev->bd_dev;
1606         char slab_name[32];
1607
1608         sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
1609
1610         sbi->page_array_slab_size = sizeof(struct page *) <<
1611                                         F2FS_OPTION(sbi).compress_log_size;
1612
1613         sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
1614                                         sbi->page_array_slab_size);
1615         if (!sbi->page_array_slab)
1616                 return -ENOMEM;
1617         return 0;
1618 }
1619
1620 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
1621 {
1622         kmem_cache_destroy(sbi->page_array_slab);
1623 }
1624
1625 static int __init f2fs_init_cic_cache(void)
1626 {
1627         cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
1628                                         sizeof(struct compress_io_ctx));
1629         if (!cic_entry_slab)
1630                 return -ENOMEM;
1631         return 0;
1632 }
1633
1634 static void f2fs_destroy_cic_cache(void)
1635 {
1636         kmem_cache_destroy(cic_entry_slab);
1637 }
1638
1639 static int __init f2fs_init_dic_cache(void)
1640 {
1641         dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
1642                                         sizeof(struct decompress_io_ctx));
1643         if (!dic_entry_slab)
1644                 return -ENOMEM;
1645         return 0;
1646 }
1647
1648 static void f2fs_destroy_dic_cache(void)
1649 {
1650         kmem_cache_destroy(dic_entry_slab);
1651 }
1652
1653 int __init f2fs_init_compress_cache(void)
1654 {
1655         int err;
1656
1657         err = f2fs_init_cic_cache();
1658         if (err)
1659                 goto out;
1660         err = f2fs_init_dic_cache();
1661         if (err)
1662                 goto free_cic;
1663         return 0;
1664 free_cic:
1665         f2fs_destroy_cic_cache();
1666 out:
1667         return -ENOMEM;
1668 }
1669
1670 void f2fs_destroy_compress_cache(void)
1671 {
1672         f2fs_destroy_dic_cache();
1673         f2fs_destroy_cic_cache();
1674 }