fs/f2fs/super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/super.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/fs.h>
  11 #include <linux/statfs.h>
  12 #include <linux/buffer_head.h>
  13 #include <linux/backing-dev.h>
  14 #include <linux/kthread.h>
  15 #include <linux/parser.h>
  16 #include <linux/mount.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/random.h>
  20 #include <linux/exportfs.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/quotaops.h>
  23 #include <linux/f2fs_fs.h>
  24 #include <linux/sysfs.h>
  25 #include <linux/quota.h>
  26 #include <linux/unicode.h>
  27
  28 #include "f2fs.h"
  29 #include "node.h"
  30 #include "segment.h"
  31 #include "xattr.h"
  32 #include "gc.h"
  33 #include "trace.h"
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/f2fs.h>
  37
  38 static struct kmem_cache *f2fs_inode_cachep;
  39
  40 #ifdef CONFIG_F2FS_FAULT_INJECTION
  41
  42 const char *f2fs_fault_name[FAULT_MAX] = {
  43         [FAULT_KMALLOC]         = "kmalloc",
  44         [FAULT_KVMALLOC]        = "kvmalloc",
  45         [FAULT_PAGE_ALLOC]      = "page alloc",
  46         [FAULT_PAGE_GET]        = "page get",
  47         [FAULT_ALLOC_BIO]       = "alloc bio",
  48         [FAULT_ALLOC_NID]       = "alloc nid",
  49         [FAULT_ORPHAN]          = "orphan",
  50         [FAULT_BLOCK]           = "no more block",
  51         [FAULT_DIR_DEPTH]       = "too big dir depth",
  52         [FAULT_EVICT_INODE]     = "evict_inode fail",
  53         [FAULT_TRUNCATE]        = "truncate fail",
  54         [FAULT_READ_IO]         = "read IO error",
  55         [FAULT_CHECKPOINT]      = "checkpoint error",
  56         [FAULT_DISCARD]         = "discard error",
  57         [FAULT_WRITE_IO]        = "write IO error",
  58 };
  59
  60 void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,
  61                                                         unsigned int type)
  62 {
  63         struct f2fs_fault_info *ffi = &F2FS_OPTION(sbi).fault_info;
  64
  65         if (rate) {
  66                 atomic_set(&ffi->inject_ops, 0);
  67                 ffi->inject_rate = rate;
  68         }
  69
  70         if (type)
  71                 ffi->inject_type = type;
  72
  73         if (!rate && !type)
  74                 memset(ffi, 0, sizeof(struct f2fs_fault_info));
  75 }
  76 #endif
  77
  78 /* f2fs-wide shrinker description */
  79 static struct shrinker f2fs_shrinker_info = {
  80         .scan_objects = f2fs_shrink_scan,
  81         .count_objects = f2fs_shrink_count,
  82         .seeks = DEFAULT_SEEKS,
  83 };
  84
  85 enum {
  86         Opt_gc_background,
  87         Opt_disable_roll_forward,
  88         Opt_norecovery,
  89         Opt_discard,
  90         Opt_nodiscard,
  91         Opt_noheap,
  92         Opt_heap,
  93         Opt_user_xattr,
  94         Opt_nouser_xattr,
  95         Opt_acl,
  96         Opt_noacl,
  97         Opt_active_logs,
  98         Opt_disable_ext_identify,
  99         Opt_inline_xattr,
 100         Opt_noinline_xattr,
 101         Opt_inline_xattr_size,
 102         Opt_inline_data,
 103         Opt_inline_dentry,
 104         Opt_noinline_dentry,
 105         Opt_flush_merge,
 106         Opt_noflush_merge,
 107         Opt_nobarrier,
 108         Opt_fastboot,
 109         Opt_extent_cache,
 110         Opt_noextent_cache,
 111         Opt_noinline_data,
 112         Opt_data_flush,
 113         Opt_reserve_root,
 114         Opt_resgid,
 115         Opt_resuid,
 116         Opt_mode,
 117         Opt_io_size_bits,
 118         Opt_fault_injection,
 119         Opt_fault_type,
 120         Opt_lazytime,
 121         Opt_nolazytime,
 122         Opt_quota,
 123         Opt_noquota,
 124         Opt_usrquota,
 125         Opt_grpquota,
 126         Opt_prjquota,
 127         Opt_usrjquota,
 128         Opt_grpjquota,
 129         Opt_prjjquota,
 130         Opt_offusrjquota,
 131         Opt_offgrpjquota,
 132         Opt_offprjjquota,
 133         Opt_jqfmt_vfsold,
 134         Opt_jqfmt_vfsv0,
 135         Opt_jqfmt_vfsv1,
 136         Opt_whint,
 137         Opt_alloc,
 138         Opt_fsync,
 139         Opt_test_dummy_encryption,
 140         Opt_checkpoint_disable,
 141         Opt_checkpoint_disable_cap,
 142         Opt_checkpoint_disable_cap_perc,
 143         Opt_checkpoint_enable,
 144         Opt_err,
 145 };
 146
 147 static match_table_t f2fs_tokens = {
 148         {Opt_gc_background, "background_gc=%s"},
 149         {Opt_disable_roll_forward, "disable_roll_forward"},
 150         {Opt_norecovery, "norecovery"},
 151         {Opt_discard, "discard"},
 152         {Opt_nodiscard, "nodiscard"},
 153         {Opt_noheap, "no_heap"},
 154         {Opt_heap, "heap"},
 155         {Opt_user_xattr, "user_xattr"},
 156         {Opt_nouser_xattr, "nouser_xattr"},
 157         {Opt_acl, "acl"},
 158         {Opt_noacl, "noacl"},
 159         {Opt_active_logs, "active_logs=%u"},
 160         {Opt_disable_ext_identify, "disable_ext_identify"},
 161         {Opt_inline_xattr, "inline_xattr"},
 162         {Opt_noinline_xattr, "noinline_xattr"},
 163         {Opt_inline_xattr_size, "inline_xattr_size=%u"},
 164         {Opt_inline_data, "inline_data"},
 165         {Opt_inline_dentry, "inline_dentry"},
 166         {Opt_noinline_dentry, "noinline_dentry"},
 167         {Opt_flush_merge, "flush_merge"},
 168         {Opt_noflush_merge, "noflush_merge"},
 169         {Opt_nobarrier, "nobarrier"},
 170         {Opt_fastboot, "fastboot"},
 171         {Opt_extent_cache, "extent_cache"},
 172         {Opt_noextent_cache, "noextent_cache"},
 173         {Opt_noinline_data, "noinline_data"},
 174         {Opt_data_flush, "data_flush"},
 175         {Opt_reserve_root, "reserve_root=%u"},
 176         {Opt_resgid, "resgid=%u"},
 177         {Opt_resuid, "resuid=%u"},
 178         {Opt_mode, "mode=%s"},
 179         {Opt_io_size_bits, "io_bits=%u"},
 180         {Opt_fault_injection, "fault_injection=%u"},
 181         {Opt_fault_type, "fault_type=%u"},
 182         {Opt_lazytime, "lazytime"},
 183         {Opt_nolazytime, "nolazytime"},
 184         {Opt_quota, "quota"},
 185         {Opt_noquota, "noquota"},
 186         {Opt_usrquota, "usrquota"},
 187         {Opt_grpquota, "grpquota"},
 188         {Opt_prjquota, "prjquota"},
 189         {Opt_usrjquota, "usrjquota=%s"},
 190         {Opt_grpjquota, "grpjquota=%s"},
 191         {Opt_prjjquota, "prjjquota=%s"},
 192         {Opt_offusrjquota, "usrjquota="},
 193         {Opt_offgrpjquota, "grpjquota="},
 194         {Opt_offprjjquota, "prjjquota="},
 195         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 196         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 197         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 198         {Opt_whint, "whint_mode=%s"},
 199         {Opt_alloc, "alloc_mode=%s"},
 200         {Opt_fsync, "fsync_mode=%s"},
 201         {Opt_test_dummy_encryption, "test_dummy_encryption"},
 202         {Opt_checkpoint_disable, "checkpoint=disable"},
 203         {Opt_checkpoint_disable_cap, "checkpoint=disable:%u"},
 204         {Opt_checkpoint_disable_cap_perc, "checkpoint=disable:%u%%"},
 205         {Opt_checkpoint_enable, "checkpoint=enable"},
 206         {Opt_err, NULL},
 207 };
 208
 209 void f2fs_printk(struct f2fs_sb_info *sbi, const char *fmt, ...)
 210 {
 211         struct va_format vaf;
 212         va_list args;
 213         int level;
 214
 215         va_start(args, fmt);
 216
 217         level = printk_get_level(fmt);
 218         vaf.fmt = printk_skip_level(fmt);
 219         vaf.va = &args;
 220         printk("%c%cF2FS-fs (%s): %pV\n",
 221                KERN_SOH_ASCII, level, sbi->sb->s_id, &vaf);
 222
 223         va_end(args);
 224 }
 225
 226 #ifdef CONFIG_UNICODE
 227 static const struct f2fs_sb_encodings {
 228         __u16 magic;
 229         char *name;
 230         char *version;
 231 } f2fs_sb_encoding_map[] = {
 232         {F2FS_ENC_UTF8_12_1, "utf8", "12.1.0"},
 233 };
 234
 235 static int f2fs_sb_read_encoding(const struct f2fs_super_block *sb,
 236                                  const struct f2fs_sb_encodings **encoding,
 237                                  __u16 *flags)
 238 {
 239         __u16 magic = le16_to_cpu(sb->s_encoding);
 240         int i;
 241
 242         for (i = 0; i < ARRAY_SIZE(f2fs_sb_encoding_map); i++)
 243                 if (magic == f2fs_sb_encoding_map[i].magic)
 244                         break;
 245
 246         if (i >= ARRAY_SIZE(f2fs_sb_encoding_map))
 247                 return -EINVAL;
 248
 249         *encoding = &f2fs_sb_encoding_map[i];
 250         *flags = le16_to_cpu(sb->s_encoding_flags);
 251
 252         return 0;
 253 }
 254 #endif
 255
 256 static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
 257 {
 258         block_t limit = min((sbi->user_block_count << 1) / 1000,
 259                         sbi->user_block_count - sbi->reserved_blocks);
 260
 261         /* limit is 0.2% */
 262         if (test_opt(sbi, RESERVE_ROOT) &&
 263                         F2FS_OPTION(sbi).root_reserved_blocks > limit) {
 264                 F2FS_OPTION(sbi).root_reserved_blocks = limit;
 265                 f2fs_info(sbi, "Reduce reserved blocks for root = %u",
 266                           F2FS_OPTION(sbi).root_reserved_blocks);
 267         }
 268         if (!test_opt(sbi, RESERVE_ROOT) &&
 269                 (!uid_eq(F2FS_OPTION(sbi).s_resuid,
 270                                 make_kuid(&init_user_ns, F2FS_DEF_RESUID)) ||
 271                 !gid_eq(F2FS_OPTION(sbi).s_resgid,
 272                                 make_kgid(&init_user_ns, F2FS_DEF_RESGID))))
 273                 f2fs_info(sbi, "Ignore s_resuid=%u, s_resgid=%u w/o reserve_root",
 274                           from_kuid_munged(&init_user_ns,
 275                                            F2FS_OPTION(sbi).s_resuid),
 276                           from_kgid_munged(&init_user_ns,
 277                                            F2FS_OPTION(sbi).s_resgid));
 278 }
 279
 280 static void init_once(void *foo)
 281 {
 282         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 283
 284         inode_init_once(&fi->vfs_inode);
 285 }
 286
 287 #ifdef CONFIG_QUOTA
 288 static const char * const quotatypes[] = INITQFNAMES;
 289 #define QTYPE2NAME(t) (quotatypes[t])
 290 static int f2fs_set_qf_name(struct super_block *sb, int qtype,
 291                                                         substring_t *args)
 292 {
 293         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 294         char *qname;
 295         int ret = -EINVAL;
 296
 297         if (sb_any_quota_loaded(sb) && !F2FS_OPTION(sbi).s_qf_names[qtype]) {
 298                 f2fs_err(sbi, "Cannot change journaled quota options when quota turned on");
 299                 return -EINVAL;
 300         }
 301         if (f2fs_sb_has_quota_ino(sbi)) {
 302                 f2fs_info(sbi, "QUOTA feature is enabled, so ignore qf_name");
 303                 return 0;
 304         }
 305
 306         qname = match_strdup(args);
 307         if (!qname) {
 308                 f2fs_err(sbi, "Not enough memory for storing quotafile name");
 309                 return -ENOMEM;
 310         }
 311         if (F2FS_OPTION(sbi).s_qf_names[qtype]) {
 312                 if (strcmp(F2FS_OPTION(sbi).s_qf_names[qtype], qname) == 0)
 313                         ret = 0;
 314                 else
 315                         f2fs_err(sbi, "%s quota file already specified",
 316                                  QTYPE2NAME(qtype));
 317                 goto errout;
 318         }
 319         if (strchr(qname, '/')) {
 320                 f2fs_err(sbi, "quotafile must be on filesystem root");
 321                 goto errout;
 322         }
 323         F2FS_OPTION(sbi).s_qf_names[qtype] = qname;
 324         set_opt(sbi, QUOTA);
 325         return 0;
 326 errout:
 327         kvfree(qname);
 328         return ret;
 329 }
 330
 331 static int f2fs_clear_qf_name(struct super_block *sb, int qtype)
 332 {
 333         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 334
 335         if (sb_any_quota_loaded(sb) && F2FS_OPTION(sbi).s_qf_names[qtype]) {
 336                 f2fs_err(sbi, "Cannot change journaled quota options when quota turned on");
 337                 return -EINVAL;
 338         }
 339         kvfree(F2FS_OPTION(sbi).s_qf_names[qtype]);
 340         F2FS_OPTION(sbi).s_qf_names[qtype] = NULL;
 341         return 0;
 342 }
 343
 344 static int f2fs_check_quota_options(struct f2fs_sb_info *sbi)
 345 {
 346         /*
 347          * We do the test below only for project quotas. 'usrquota' and
 348          * 'grpquota' mount options are allowed even without quota feature
 349          * to support legacy quotas in quota files.
 350          */
 351         if (test_opt(sbi, PRJQUOTA) && !f2fs_sb_has_project_quota(sbi)) {
 352                 f2fs_err(sbi, "Project quota feature not enabled. Cannot enable project quota enforcement.");
 353                 return -1;
 354         }
 355         if (F2FS_OPTION(sbi).s_qf_names[USRQUOTA] ||
 356                         F2FS_OPTION(sbi).s_qf_names[GRPQUOTA] ||
 357                         F2FS_OPTION(sbi).s_qf_names[PRJQUOTA]) {
 358                 if (test_opt(sbi, USRQUOTA) &&
 359                                 F2FS_OPTION(sbi).s_qf_names[USRQUOTA])
 360                         clear_opt(sbi, USRQUOTA);
 361
 362                 if (test_opt(sbi, GRPQUOTA) &&
 363                                 F2FS_OPTION(sbi).s_qf_names[GRPQUOTA])
 364                         clear_opt(sbi, GRPQUOTA);
 365
 366                 if (test_opt(sbi, PRJQUOTA) &&
 367                                 F2FS_OPTION(sbi).s_qf_names[PRJQUOTA])
 368                         clear_opt(sbi, PRJQUOTA);
 369
 370                 if (test_opt(sbi, GRPQUOTA) || test_opt(sbi, USRQUOTA) ||
 371                                 test_opt(sbi, PRJQUOTA)) {
 372                         f2fs_err(sbi, "old and new quota format mixing");
 373                         return -1;
 374                 }
 375
 376                 if (!F2FS_OPTION(sbi).s_jquota_fmt) {
 377                         f2fs_err(sbi, "journaled quota format not specified");
 378                         return -1;
 379                 }
 380         }
 381
 382         if (f2fs_sb_has_quota_ino(sbi) && F2FS_OPTION(sbi).s_jquota_fmt) {
 383                 f2fs_info(sbi, "QUOTA feature is enabled, so ignore jquota_fmt");
 384                 F2FS_OPTION(sbi).s_jquota_fmt = 0;
 385         }
 386         return 0;
 387 }
 388 #endif
 389
 390 static int parse_options(struct super_block *sb, char *options)
 391 {
 392         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 393         substring_t args[MAX_OPT_ARGS];
 394         char *p, *name;
 395         int arg = 0;
 396         kuid_t uid;
 397         kgid_t gid;
 398 #ifdef CONFIG_QUOTA
 399         int ret;
 400 #endif
 401
 402         if (!options)
 403                 return 0;
 404
 405         while ((p = strsep(&options, ",")) != NULL) {
 406                 int token;
 407                 if (!*p)
 408                         continue;
 409                 /*
 410                  * Initialize args struct so we know whether arg was
 411                  * found; some options take optional arguments.
 412                  */
 413                 args[0].to = args[0].from = NULL;
 414                 token = match_token(p, f2fs_tokens, args);
 415
 416                 switch (token) {
 417                 case Opt_gc_background:
 418                         name = match_strdup(&args[0]);
 419
 420                         if (!name)
 421                                 return -ENOMEM;
 422                         if (strlen(name) == 2 && !strncmp(name, "on", 2)) {
 423                                 set_opt(sbi, BG_GC);
 424                                 clear_opt(sbi, FORCE_FG_GC);
 425                         } else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {
 426                                 clear_opt(sbi, BG_GC);
 427                                 clear_opt(sbi, FORCE_FG_GC);
 428                         } else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {
 429                                 set_opt(sbi, BG_GC);
 430                                 set_opt(sbi, FORCE_FG_GC);
 431                         } else {
 432                                 kvfree(name);
 433                                 return -EINVAL;
 434                         }
 435                         kvfree(name);
 436                         break;
 437                 case Opt_disable_roll_forward:
 438                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 439                         break;
 440                 case Opt_norecovery:
 441                         /* this option mounts f2fs with ro */
 442                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 443                         if (!f2fs_readonly(sb))
 444                                 return -EINVAL;
 445                         break;
 446                 case Opt_discard:
 447                         set_opt(sbi, DISCARD);
 448                         break;
 449                 case Opt_nodiscard:
 450                         if (f2fs_sb_has_blkzoned(sbi)) {
 451                                 f2fs_warn(sbi, "discard is required for zoned block devices");
 452                                 return -EINVAL;
 453                         }
 454                         clear_opt(sbi, DISCARD);
 455                         break;
 456                 case Opt_noheap:
 457                         set_opt(sbi, NOHEAP);
 458                         break;
 459                 case Opt_heap:
 460                         clear_opt(sbi, NOHEAP);
 461                         break;
 462 #ifdef CONFIG_F2FS_FS_XATTR
 463                 case Opt_user_xattr:
 464                         set_opt(sbi, XATTR_USER);
 465                         break;
 466                 case Opt_nouser_xattr:
 467                         clear_opt(sbi, XATTR_USER);
 468                         break;
 469                 case Opt_inline_xattr:
 470                         set_opt(sbi, INLINE_XATTR);
 471                         break;
 472                 case Opt_noinline_xattr:
 473                         clear_opt(sbi, INLINE_XATTR);
 474                         break;
 475                 case Opt_inline_xattr_size:
 476                         if (args->from && match_int(args, &arg))
 477                                 return -EINVAL;
 478                         set_opt(sbi, INLINE_XATTR_SIZE);
 479                         F2FS_OPTION(sbi).inline_xattr_size = arg;
 480                         break;
 481 #else
 482                 case Opt_user_xattr:
 483                         f2fs_info(sbi, "user_xattr options not supported");
 484                         break;
 485                 case Opt_nouser_xattr:
 486                         f2fs_info(sbi, "nouser_xattr options not supported");
 487                         break;
 488                 case Opt_inline_xattr:
 489                         f2fs_info(sbi, "inline_xattr options not supported");
 490                         break;
 491                 case Opt_noinline_xattr:
 492                         f2fs_info(sbi, "noinline_xattr options not supported");
 493                         break;
 494 #endif
 495 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 496                 case Opt_acl:
 497                         set_opt(sbi, POSIX_ACL);
 498                         break;
 499                 case Opt_noacl:
 500                         clear_opt(sbi, POSIX_ACL);
 501                         break;
 502 #else
 503                 case Opt_acl:
 504                         f2fs_info(sbi, "acl options not supported");
 505                         break;
 506                 case Opt_noacl:
 507                         f2fs_info(sbi, "noacl options not supported");
 508                         break;
 509 #endif
 510                 case Opt_active_logs:
 511                         if (args->from && match_int(args, &arg))
 512                                 return -EINVAL;
 513                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 514                                 return -EINVAL;
 515                         F2FS_OPTION(sbi).active_logs = arg;
 516                         break;
 517                 case Opt_disable_ext_identify:
 518                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 519                         break;
 520                 case Opt_inline_data:
 521                         set_opt(sbi, INLINE_DATA);
 522                         break;
 523                 case Opt_inline_dentry:
 524                         set_opt(sbi, INLINE_DENTRY);
 525                         break;
 526                 case Opt_noinline_dentry:
 527                         clear_opt(sbi, INLINE_DENTRY);
 528                         break;
 529                 case Opt_flush_merge:
 530                         set_opt(sbi, FLUSH_MERGE);
 531                         break;
 532                 case Opt_noflush_merge:
 533                         clear_opt(sbi, FLUSH_MERGE);
 534                         break;
 535                 case Opt_nobarrier:
 536                         set_opt(sbi, NOBARRIER);
 537                         break;
 538                 case Opt_fastboot:
 539                         set_opt(sbi, FASTBOOT);
 540                         break;
 541                 case Opt_extent_cache:
 542                         set_opt(sbi, EXTENT_CACHE);
 543                         break;
 544                 case Opt_noextent_cache:
 545                         clear_opt(sbi, EXTENT_CACHE);
 546                         break;
 547                 case Opt_noinline_data:
 548                         clear_opt(sbi, INLINE_DATA);
 549                         break;
 550                 case Opt_data_flush:
 551                         set_opt(sbi, DATA_FLUSH);
 552                         break;
 553                 case Opt_reserve_root:
 554                         if (args->from && match_int(args, &arg))
 555                                 return -EINVAL;
 556                         if (test_opt(sbi, RESERVE_ROOT)) {
 557                                 f2fs_info(sbi, "Preserve previous reserve_root=%u",
 558                                           F2FS_OPTION(sbi).root_reserved_blocks);
 559                         } else {
 560                                 F2FS_OPTION(sbi).root_reserved_blocks = arg;
 561                                 set_opt(sbi, RESERVE_ROOT);
 562                         }
 563                         break;
 564                 case Opt_resuid:
 565                         if (args->from && match_int(args, &arg))
 566                                 return -EINVAL;
 567                         uid = make_kuid(current_user_ns(), arg);
 568                         if (!uid_valid(uid)) {
 569                                 f2fs_err(sbi, "Invalid uid value %d", arg);
 570                                 return -EINVAL;
 571                         }
 572                         F2FS_OPTION(sbi).s_resuid = uid;
 573                         break;
 574                 case Opt_resgid:
 575                         if (args->from && match_int(args, &arg))
 576                                 return -EINVAL;
 577                         gid = make_kgid(current_user_ns(), arg);
 578                         if (!gid_valid(gid)) {
 579                                 f2fs_err(sbi, "Invalid gid value %d", arg);
 580                                 return -EINVAL;
 581                         }
 582                         F2FS_OPTION(sbi).s_resgid = gid;
 583                         break;
 584                 case Opt_mode:
 585                         name = match_strdup(&args[0]);
 586
 587                         if (!name)
 588                                 return -ENOMEM;
 589                         if (strlen(name) == 8 &&
 590                                         !strncmp(name, "adaptive", 8)) {
 591                                 if (f2fs_sb_has_blkzoned(sbi)) {
 592                                         f2fs_warn(sbi, "adaptive mode is not allowed with zoned block device feature");
 593                                         kvfree(name);
 594                                         return -EINVAL;
 595                                 }
 596                                 set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
 597                         } else if (strlen(name) == 3 &&
 598                                         !strncmp(name, "lfs", 3)) {
 599                                 set_opt_mode(sbi, F2FS_MOUNT_LFS);
 600                         } else {
 601                                 kvfree(name);
 602                                 return -EINVAL;
 603                         }
 604                         kvfree(name);
 605                         break;
 606                 case Opt_io_size_bits:
 607                         if (args->from && match_int(args, &arg))
 608                                 return -EINVAL;
 609                         if (arg <= 0 || arg > __ilog2_u32(BIO_MAX_PAGES)) {
 610                                 f2fs_warn(sbi, "Not support %d, larger than %d",
 611                                           1 << arg, BIO_MAX_PAGES);
 612                                 return -EINVAL;
 613                         }
 614                         F2FS_OPTION(sbi).write_io_size_bits = arg;
 615                         break;
 616 #ifdef CONFIG_F2FS_FAULT_INJECTION
 617                 case Opt_fault_injection:
 618                         if (args->from && match_int(args, &arg))
 619                                 return -EINVAL;
 620                         f2fs_build_fault_attr(sbi, arg, F2FS_ALL_FAULT_TYPE);
 621                         set_opt(sbi, FAULT_INJECTION);
 622                         break;
 623
 624                 case Opt_fault_type:
 625                         if (args->from && match_int(args, &arg))
 626                                 return -EINVAL;
 627                         f2fs_build_fault_attr(sbi, 0, arg);
 628                         set_opt(sbi, FAULT_INJECTION);
 629                         break;
 630 #else
 631                 case Opt_fault_injection:
 632                         f2fs_info(sbi, "fault_injection options not supported");
 633                         break;
 634
 635                 case Opt_fault_type:
 636                         f2fs_info(sbi, "fault_type options not supported");
 637                         break;
 638 #endif
 639                 case Opt_lazytime:
 640                         sb->s_flags |= SB_LAZYTIME;
 641                         break;
 642                 case Opt_nolazytime:
 643                         sb->s_flags &= ~SB_LAZYTIME;
 644                         break;
 645 #ifdef CONFIG_QUOTA
 646                 case Opt_quota:
 647                 case Opt_usrquota:
 648                         set_opt(sbi, USRQUOTA);
 649                         break;
 650                 case Opt_grpquota:
 651                         set_opt(sbi, GRPQUOTA);
 652                         break;
 653                 case Opt_prjquota:
 654                         set_opt(sbi, PRJQUOTA);
 655                         break;
 656                 case Opt_usrjquota:
 657                         ret = f2fs_set_qf_name(sb, USRQUOTA, &args[0]);
 658                         if (ret)
 659                                 return ret;
 660                         break;
 661                 case Opt_grpjquota:
 662                         ret = f2fs_set_qf_name(sb, GRPQUOTA, &args[0]);
 663                         if (ret)
 664                                 return ret;
 665                         break;
 666                 case Opt_prjjquota:
 667                         ret = f2fs_set_qf_name(sb, PRJQUOTA, &args[0]);
 668                         if (ret)
 669                                 return ret;
 670                         break;
 671                 case Opt_offusrjquota:
 672                         ret = f2fs_clear_qf_name(sb, USRQUOTA);
 673                         if (ret)
 674                                 return ret;
 675                         break;
 676                 case Opt_offgrpjquota:
 677                         ret = f2fs_clear_qf_name(sb, GRPQUOTA);
 678                         if (ret)
 679                                 return ret;
 680                         break;
 681                 case Opt_offprjjquota:
 682                         ret = f2fs_clear_qf_name(sb, PRJQUOTA);
 683                         if (ret)
 684                                 return ret;
 685                         break;
 686                 case Opt_jqfmt_vfsold:
 687                         F2FS_OPTION(sbi).s_jquota_fmt = QFMT_VFS_OLD;
 688                         break;
 689                 case Opt_jqfmt_vfsv0:
 690                         F2FS_OPTION(sbi).s_jquota_fmt = QFMT_VFS_V0;
 691                         break;
 692                 case Opt_jqfmt_vfsv1:
 693                         F2FS_OPTION(sbi).s_jquota_fmt = QFMT_VFS_V1;
 694                         break;
 695                 case Opt_noquota:
 696                         clear_opt(sbi, QUOTA);
 697                         clear_opt(sbi, USRQUOTA);
 698                         clear_opt(sbi, GRPQUOTA);
 699                         clear_opt(sbi, PRJQUOTA);
 700                         break;
 701 #else
 702                 case Opt_quota:
 703                 case Opt_usrquota:
 704                 case Opt_grpquota:
 705                 case Opt_prjquota:
 706                 case Opt_usrjquota:
 707                 case Opt_grpjquota:
 708                 case Opt_prjjquota:
 709                 case Opt_offusrjquota:
 710                 case Opt_offgrpjquota:
 711                 case Opt_offprjjquota:
 712                 case Opt_jqfmt_vfsold:
 713                 case Opt_jqfmt_vfsv0:
 714                 case Opt_jqfmt_vfsv1:
 715                 case Opt_noquota:
 716                         f2fs_info(sbi, "quota operations not supported");
 717                         break;
 718 #endif
 719                 case Opt_whint:
 720                         name = match_strdup(&args[0]);
 721                         if (!name)
 722                                 return -ENOMEM;
 723                         if (strlen(name) == 10 &&
 724                                         !strncmp(name, "user-based", 10)) {
 725                                 F2FS_OPTION(sbi).whint_mode = WHINT_MODE_USER;
 726                         } else if (strlen(name) == 3 &&
 727                                         !strncmp(name, "off", 3)) {
 728                                 F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
 729                         } else if (strlen(name) == 8 &&
 730                                         !strncmp(name, "fs-based", 8)) {
 731                                 F2FS_OPTION(sbi).whint_mode = WHINT_MODE_FS;
 732                         } else {
 733                                 kvfree(name);
 734                                 return -EINVAL;
 735                         }
 736                         kvfree(name);
 737                         break;
 738                 case Opt_alloc:
 739                         name = match_strdup(&args[0]);
 740                         if (!name)
 741                                 return -ENOMEM;
 742
 743                         if (strlen(name) == 7 &&
 744                                         !strncmp(name, "default", 7)) {
 745                                 F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
 746                         } else if (strlen(name) == 5 &&
 747                                         !strncmp(name, "reuse", 5)) {
 748                                 F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_REUSE;
 749                         } else {
 750                                 kvfree(name);
 751                                 return -EINVAL;
 752                         }
 753                         kvfree(name);
 754                         break;
 755                 case Opt_fsync:
 756                         name = match_strdup(&args[0]);
 757                         if (!name)
 758                                 return -ENOMEM;
 759                         if (strlen(name) == 5 &&
 760                                         !strncmp(name, "posix", 5)) {
 761                                 F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
 762                         } else if (strlen(name) == 6 &&
 763                                         !strncmp(name, "strict", 6)) {
 764                                 F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_STRICT;
 765                         } else if (strlen(name) == 9 &&
 766                                         !strncmp(name, "nobarrier", 9)) {
 767                                 F2FS_OPTION(sbi).fsync_mode =
 768                                                         FSYNC_MODE_NOBARRIER;
 769                         } else {
 770                                 kvfree(name);
 771                                 return -EINVAL;
 772                         }
 773                         kvfree(name);
 774                         break;
 775                 case Opt_test_dummy_encryption:
 776 #ifdef CONFIG_FS_ENCRYPTION
 777                         if (!f2fs_sb_has_encrypt(sbi)) {
 778                                 f2fs_err(sbi, "Encrypt feature is off");
 779                                 return -EINVAL;
 780                         }
 781
 782                         F2FS_OPTION(sbi).test_dummy_encryption = true;
 783                         f2fs_info(sbi, "Test dummy encryption mode enabled");
 784 #else
 785                         f2fs_info(sbi, "Test dummy encryption mount option ignored");
 786 #endif
 787                         break;
 788                 case Opt_checkpoint_disable_cap_perc:
 789                         if (args->from && match_int(args, &arg))
 790                                 return -EINVAL;
 791                         if (arg < 0 || arg > 100)
 792                                 return -EINVAL;
 793                         if (arg == 100)
 794                                 F2FS_OPTION(sbi).unusable_cap =
 795                                         sbi->user_block_count;
 796                         else
 797                                 F2FS_OPTION(sbi).unusable_cap =
 798                                         (sbi->user_block_count / 100) * arg;
 799                         set_opt(sbi, DISABLE_CHECKPOINT);
 800                         break;
 801                 case Opt_checkpoint_disable_cap:
 802                         if (args->from && match_int(args, &arg))
 803                                 return -EINVAL;
 804                         F2FS_OPTION(sbi).unusable_cap = arg;
 805                         set_opt(sbi, DISABLE_CHECKPOINT);
 806                         break;
 807                 case Opt_checkpoint_disable:
 808                         set_opt(sbi, DISABLE_CHECKPOINT);
 809                         break;
 810                 case Opt_checkpoint_enable:
 811                         clear_opt(sbi, DISABLE_CHECKPOINT);
 812                         break;
 813                 default:
 814                         f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
 815                                  p);
 816                         return -EINVAL;
 817                 }
 818         }
 819 #ifdef CONFIG_QUOTA
 820         if (f2fs_check_quota_options(sbi))
 821                 return -EINVAL;
 822 #else
 823         if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sbi->sb)) {
 824                 f2fs_info(sbi, "Filesystem with quota feature cannot be mounted RDWR without CONFIG_QUOTA");
 825                 return -EINVAL;
 826         }
 827         if (f2fs_sb_has_project_quota(sbi) && !f2fs_readonly(sbi->sb)) {
 828                 f2fs_err(sbi, "Filesystem with project quota feature cannot be mounted RDWR without CONFIG_QUOTA");
 829                 return -EINVAL;
 830         }
 831 #endif
 832 #ifndef CONFIG_UNICODE
 833         if (f2fs_sb_has_casefold(sbi)) {
 834                 f2fs_err(sbi,
 835                         "Filesystem with casefold feature cannot be mounted without CONFIG_UNICODE");
 836                 return -EINVAL;
 837         }
 838 #endif
 839
 840         if (F2FS_IO_SIZE_BITS(sbi) && !test_opt(sbi, LFS)) {
 841                 f2fs_err(sbi, "Should set mode=lfs with %uKB-sized IO",
 842                          F2FS_IO_SIZE_KB(sbi));
 843                 return -EINVAL;
 844         }
 845
 846         if (test_opt(sbi, INLINE_XATTR_SIZE)) {
 847                 int min_size, max_size;
 848
 849                 if (!f2fs_sb_has_extra_attr(sbi) ||
 850                         !f2fs_sb_has_flexible_inline_xattr(sbi)) {
 851                         f2fs_err(sbi, "extra_attr or flexible_inline_xattr feature is off");
 852                         return -EINVAL;
 853                 }
 854                 if (!test_opt(sbi, INLINE_XATTR)) {
 855                         f2fs_err(sbi, "inline_xattr_size option should be set with inline_xattr option");
 856                         return -EINVAL;
 857                 }
 858
 859                 min_size = sizeof(struct f2fs_xattr_header) / sizeof(__le32);
 860                 max_size = MAX_INLINE_XATTR_SIZE;
 861
 862                 if (F2FS_OPTION(sbi).inline_xattr_size < min_size ||
 863                                 F2FS_OPTION(sbi).inline_xattr_size > max_size) {
 864                         f2fs_err(sbi, "inline xattr size is out of range: %d ~ %d",
 865                                  min_size, max_size);
 866                         return -EINVAL;
 867                 }
 868         }
 869
 870         if (test_opt(sbi, DISABLE_CHECKPOINT) && test_opt(sbi, LFS)) {
 871                 f2fs_err(sbi, "LFS not compatible with checkpoint=disable\n");
 872                 return -EINVAL;
 873         }
 874
 875         /* Not pass down write hints if the number of active logs is lesser
 876          * than NR_CURSEG_TYPE.
 877          */
 878         if (F2FS_OPTION(sbi).active_logs != NR_CURSEG_TYPE)
 879                 F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
 880         return 0;
 881 }
 882
 883 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 884 {
 885         struct f2fs_inode_info *fi;
 886
 887         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 888         if (!fi)
 889                 return NULL;
 890
 891         init_once((void *) fi);
 892
 893         /* Initialize f2fs-specific inode info */
 894         atomic_set(&fi->dirty_pages, 0);
 895         init_rwsem(&fi->i_sem);
 896         INIT_LIST_HEAD(&fi->dirty_list);
 897         INIT_LIST_HEAD(&fi->gdirty_list);
 898         INIT_LIST_HEAD(&fi->inmem_ilist);
 899         INIT_LIST_HEAD(&fi->inmem_pages);
 900         mutex_init(&fi->inmem_lock);
 901         init_rwsem(&fi->i_gc_rwsem[READ]);
 902         init_rwsem(&fi->i_gc_rwsem[WRITE]);
 903         init_rwsem(&fi->i_mmap_sem);
 904         init_rwsem(&fi->i_xattr_sem);
 905
 906         /* Will be used by directory only */
 907         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 908
 909         return &fi->vfs_inode;
 910 }
 911
 912 static int f2fs_drop_inode(struct inode *inode)
 913 {
 914         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 915         int ret;
 916
 917         /*
 918          * during filesystem shutdown, if checkpoint is disabled,
 919          * drop useless meta/node dirty pages.
 920          */
 921         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
 922                 if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 923                         inode->i_ino == F2FS_META_INO(sbi)) {
 924                         trace_f2fs_drop_inode(inode, 1);
 925                         return 1;
 926                 }
 927         }
 928
 929         /*
 930          * This is to avoid a deadlock condition like below.
 931          * writeback_single_inode(inode)
 932          *  - f2fs_write_data_page
 933          *    - f2fs_gc -> iput -> evict
 934          *       - inode_wait_for_writeback(inode)
 935          */
 936         if ((!inode_unhashed(inode) && inode->i_state & I_SYNC)) {
 937                 if (!inode->i_nlink && !is_bad_inode(inode)) {
 938                         /* to avoid evict_inode call simultaneously */
 939                         atomic_inc(&inode->i_count);
 940                         spin_unlock(&inode->i_lock);
 941
 942                         /* some remained atomic pages should discarded */
 943                         if (f2fs_is_atomic_file(inode))
 944                                 f2fs_drop_inmem_pages(inode);
 945
 946                         /* should remain fi->extent_tree for writepage */
 947                         f2fs_destroy_extent_node(inode);
 948
 949                         sb_start_intwrite(inode->i_sb);
 950                         f2fs_i_size_write(inode, 0);
 951
 952                         f2fs_submit_merged_write_cond(F2FS_I_SB(inode),
 953                                         inode, NULL, 0, DATA);
 954                         truncate_inode_pages_final(inode->i_mapping);
 955
 956                         if (F2FS_HAS_BLOCKS(inode))
 957                                 f2fs_truncate(inode);
 958
 959                         sb_end_intwrite(inode->i_sb);
 960
 961                         spin_lock(&inode->i_lock);
 962                         atomic_dec(&inode->i_count);
 963                 }
 964                 trace_f2fs_drop_inode(inode, 0);
 965                 return 0;
 966         }
 967         ret = generic_drop_inode(inode);
 968         if (!ret)
 969                 ret = fscrypt_drop_inode(inode);
 970         trace_f2fs_drop_inode(inode, ret);
 971         return ret;
 972 }
 973
 974 int f2fs_inode_dirtied(struct inode *inode, bool sync)
 975 {
 976         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 977         int ret = 0;
 978
 979         spin_lock(&sbi->inode_lock[DIRTY_META]);
 980         if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
 981                 ret = 1;
 982         } else {
 983                 set_inode_flag(inode, FI_DIRTY_INODE);
 984                 stat_inc_dirty_inode(sbi, DIRTY_META);
 985         }
 986         if (sync && list_empty(&F2FS_I(inode)->gdirty_list)) {
 987                 list_add_tail(&F2FS_I(inode)->gdirty_list,
 988                                 &sbi->inode_list[DIRTY_META]);
 989                 inc_page_count(sbi, F2FS_DIRTY_IMETA);
 990         }
 991         spin_unlock(&sbi->inode_lock[DIRTY_META]);
 992         return ret;
 993 }
 994
 995 void f2fs_inode_synced(struct inode *inode)
 996 {
 997         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 998
 999         spin_lock(&sbi->inode_lock[DIRTY_META]);
1000         if (!is_inode_flag_set(inode, FI_DIRTY_INODE)) {
1001                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
1002                 return;
1003         }
1004         if (!list_empty(&F2FS_I(inode)->gdirty_list)) {
1005                 list_del_init(&F2FS_I(inode)->gdirty_list);
1006                 dec_page_count(sbi, F2FS_DIRTY_IMETA);
1007         }
1008         clear_inode_flag(inode, FI_DIRTY_INODE);
1009         clear_inode_flag(inode, FI_AUTO_RECOVER);
1010         stat_dec_dirty_inode(F2FS_I_SB(inode), DIRTY_META);
1011         spin_unlock(&sbi->inode_lock[DIRTY_META]);
1012 }
1013
1014 /*
1015  * f2fs_dirty_inode() is called from __mark_inode_dirty()
1016  *
1017  * We should call set_dirty_inode to write the dirty inode through write_inode.
1018  */
1019 static void f2fs_dirty_inode(struct inode *inode, int flags)
1020 {
1021         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1022
1023         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
1024                         inode->i_ino == F2FS_META_INO(sbi))
1025                 return;
1026
1027         if (flags == I_DIRTY_TIME)
1028                 return;
1029
1030         if (is_inode_flag_set(inode, FI_AUTO_RECOVER))
1031                 clear_inode_flag(inode, FI_AUTO_RECOVER);
1032
1033         f2fs_inode_dirtied(inode, false);
1034 }
1035
1036 static void f2fs_free_inode(struct inode *inode)
1037 {
1038         fscrypt_free_inode(inode);
1039         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
1040 }
1041
1042 static void destroy_percpu_info(struct f2fs_sb_info *sbi)
1043 {
1044         percpu_counter_destroy(&sbi->alloc_valid_block_count);
1045         percpu_counter_destroy(&sbi->total_valid_inode_count);
1046 }
1047
1048 static void destroy_device_list(struct f2fs_sb_info *sbi)
1049 {
1050         int i;
1051
1052         for (i = 0; i < sbi->s_ndevs; i++) {
1053                 blkdev_put(FDEV(i).bdev, FMODE_EXCL);
1054 #ifdef CONFIG_BLK_DEV_ZONED
1055                 kvfree(FDEV(i).blkz_seq);
1056 #endif
1057         }
1058         kvfree(sbi->devs);
1059 }
1060
1061 static void f2fs_put_super(struct super_block *sb)
1062 {
1063         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1064         int i;
1065         bool dropped;
1066
1067         f2fs_quota_off_umount(sb);
1068
1069         /* prevent remaining shrinker jobs */
1070         mutex_lock(&sbi->umount_mutex);
1071
1072         /*
1073          * We don't need to do checkpoint when superblock is clean.
1074          * But, the previous checkpoint was not done by umount, it needs to do
1075          * clean checkpoint again.
1076          */
1077         if ((is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
1078                         !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG))) {
1079                 struct cp_control cpc = {
1080                         .reason = CP_UMOUNT,
1081                 };
1082                 f2fs_write_checkpoint(sbi, &cpc);
1083         }
1084
1085         /* be sure to wait for any on-going discard commands */
1086         dropped = f2fs_issue_discard_timeout(sbi);
1087
1088         if ((f2fs_hw_support_discard(sbi) || f2fs_hw_should_discard(sbi)) &&
1089                                         !sbi->discard_blks && !dropped) {
1090                 struct cp_control cpc = {
1091                         .reason = CP_UMOUNT | CP_TRIMMED,
1092                 };
1093                 f2fs_write_checkpoint(sbi, &cpc);
1094         }
1095
1096         /*
1097          * normally superblock is clean, so we need to release this.
1098          * In addition, EIO will skip do checkpoint, we need this as well.
1099          */
1100         f2fs_release_ino_entry(sbi, true);
1101
1102         f2fs_leave_shrinker(sbi);
1103         mutex_unlock(&sbi->umount_mutex);
1104
1105         /* our cp_error case, we can wait for any writeback page */
1106         f2fs_flush_merged_writes(sbi);
1107
1108         f2fs_wait_on_all_pages_writeback(sbi);
1109
1110         f2fs_bug_on(sbi, sbi->fsync_node_num);
1111
1112         iput(sbi->node_inode);
1113         sbi->node_inode = NULL;
1114
1115         iput(sbi->meta_inode);
1116         sbi->meta_inode = NULL;
1117
1118         /*
1119          * iput() can update stat information, if f2fs_write_checkpoint()
1120          * above failed with error.
1121          */
1122         f2fs_destroy_stats(sbi);
1123
1124         /* destroy f2fs internal modules */
1125         f2fs_destroy_node_manager(sbi);
1126         f2fs_destroy_segment_manager(sbi);
1127
1128         kvfree(sbi->ckpt);
1129
1130         f2fs_unregister_sysfs(sbi);
1131
1132         sb->s_fs_info = NULL;
1133         if (sbi->s_chksum_driver)
1134                 crypto_free_shash(sbi->s_chksum_driver);
1135         kvfree(sbi->raw_super);
1136
1137         destroy_device_list(sbi);
1138         mempool_destroy(sbi->write_io_dummy);
1139 #ifdef CONFIG_QUOTA
1140         for (i = 0; i < MAXQUOTAS; i++)
1141                 kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
1142 #endif
1143         destroy_percpu_info(sbi);
1144         for (i = 0; i < NR_PAGE_TYPE; i++)
1145                 kvfree(sbi->write_io[i]);
1146 #ifdef CONFIG_UNICODE
1147         utf8_unload(sbi->s_encoding);
1148 #endif
1149         kvfree(sbi);
1150 }
1151
1152 int f2fs_sync_fs(struct super_block *sb, int sync)
1153 {
1154         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1155         int err = 0;
1156
1157         if (unlikely(f2fs_cp_error(sbi)))
1158                 return 0;
1159         if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
1160                 return 0;
1161
1162         trace_f2fs_sync_fs(sb, sync);
1163
1164         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
1165                 return -EAGAIN;
1166
1167         if (sync) {
1168                 struct cp_control cpc;
1169
1170                 cpc.reason = __get_cp_reason(sbi);
1171
1172                 mutex_lock(&sbi->gc_mutex);
1173                 err = f2fs_write_checkpoint(sbi, &cpc);
1174                 mutex_unlock(&sbi->gc_mutex);
1175         }
1176         f2fs_trace_ios(NULL, 1);
1177
1178         return err;
1179 }
1180
1181 static int f2fs_freeze(struct super_block *sb)
1182 {
1183         if (f2fs_readonly(sb))
1184                 return 0;
1185
1186         /* IO error happened before */
1187         if (unlikely(f2fs_cp_error(F2FS_SB(sb))))
1188                 return -EIO;
1189
1190         /* must be clean, since sync_filesystem() was already called */
1191         if (is_sbi_flag_set(F2FS_SB(sb), SBI_IS_DIRTY))
1192                 return -EINVAL;
1193         return 0;
1194 }
1195
1196 static int f2fs_unfreeze(struct super_block *sb)
1197 {
1198         return 0;
1199 }
1200
1201 #ifdef CONFIG_QUOTA
1202 static int f2fs_statfs_project(struct super_block *sb,
1203                                 kprojid_t projid, struct kstatfs *buf)
1204 {
1205         struct kqid qid;
1206         struct dquot *dquot;
1207         u64 limit;
1208         u64 curblock;
1209
1210         qid = make_kqid_projid(projid);
1211         dquot = dqget(sb, qid);
1212         if (IS_ERR(dquot))
1213                 return PTR_ERR(dquot);
1214         spin_lock(&dquot->dq_dqb_lock);
1215
1216         limit = (dquot->dq_dqb.dqb_bsoftlimit ?
1217                  dquot->dq_dqb.dqb_bsoftlimit :
1218                  dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
1219         if (limit && buf->f_blocks > limit) {
1220                 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
1221                 buf->f_blocks = limit;
1222                 buf->f_bfree = buf->f_bavail =
1223                         (buf->f_blocks > curblock) ?
1224                          (buf->f_blocks - curblock) : 0;
1225         }
1226
1227         limit = dquot->dq_dqb.dqb_isoftlimit ?
1228                 dquot->dq_dqb.dqb_isoftlimit :
1229                 dquot->dq_dqb.dqb_ihardlimit;
1230         if (limit && buf->f_files > limit) {
1231                 buf->f_files = limit;
1232                 buf->f_ffree =
1233                         (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
1234                          (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
1235         }
1236
1237         spin_unlock(&dquot->dq_dqb_lock);
1238         dqput(dquot);
1239         return 0;
1240 }
1241 #endif
1242
1243 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
1244 {
1245         struct super_block *sb = dentry->d_sb;
1246         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1247         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1248         block_t total_count, user_block_count, start_count;
1249         u64 avail_node_count;
1250
1251         total_count = le64_to_cpu(sbi->raw_super->block_count);
1252         user_block_count = sbi->user_block_count;
1253         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
1254         buf->f_type = F2FS_SUPER_MAGIC;
1255         buf->f_bsize = sbi->blocksize;
1256
1257         buf->f_blocks = total_count - start_count;
1258         buf->f_bfree = user_block_count - valid_user_blocks(sbi) -
1259                                                 sbi->current_reserved_blocks;
1260
1261         spin_lock(&sbi->stat_lock);
1262         if (unlikely(buf->f_bfree <= sbi->unusable_block_count))
1263                 buf->f_bfree = 0;
1264         else
1265                 buf->f_bfree -= sbi->unusable_block_count;
1266         spin_unlock(&sbi->stat_lock);
1267
1268         if (buf->f_bfree > F2FS_OPTION(sbi).root_reserved_blocks)
1269                 buf->f_bavail = buf->f_bfree -
1270                                 F2FS_OPTION(sbi).root_reserved_blocks;
1271         else
1272                 buf->f_bavail = 0;
1273
1274         avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
1275
1276         if (avail_node_count > user_block_count) {
1277                 buf->f_files = user_block_count;
1278                 buf->f_ffree = buf->f_bavail;
1279         } else {
1280                 buf->f_files = avail_node_count;
1281                 buf->f_ffree = min(avail_node_count - valid_node_count(sbi),
1282                                         buf->f_bavail);
1283         }
1284
1285         buf->f_namelen = F2FS_NAME_LEN;
1286         buf->f_fsid.val[0] = (u32)id;
1287         buf->f_fsid.val[1] = (u32)(id >> 32);
1288
1289 #ifdef CONFIG_QUOTA
1290         if (is_inode_flag_set(dentry->d_inode, FI_PROJ_INHERIT) &&
1291                         sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
1292                 f2fs_statfs_project(sb, F2FS_I(dentry->d_inode)->i_projid, buf);
1293         }
1294 #endif
1295         return 0;
1296 }
1297
1298 static inline void f2fs_show_quota_options(struct seq_file *seq,
1299                                            struct super_block *sb)
1300 {
1301 #ifdef CONFIG_QUOTA
1302         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1303
1304         if (F2FS_OPTION(sbi).s_jquota_fmt) {
1305                 char *fmtname = "";
1306
1307                 switch (F2FS_OPTION(sbi).s_jquota_fmt) {
1308                 case QFMT_VFS_OLD:
1309                         fmtname = "vfsold";
1310                         break;
1311                 case QFMT_VFS_V0:
1312                         fmtname = "vfsv0";
1313                         break;
1314                 case QFMT_VFS_V1:
1315                         fmtname = "vfsv1";
1316                         break;
1317                 }
1318                 seq_printf(seq, ",jqfmt=%s", fmtname);
1319         }
1320
1321         if (F2FS_OPTION(sbi).s_qf_names[USRQUOTA])
1322                 seq_show_option(seq, "usrjquota",
1323                         F2FS_OPTION(sbi).s_qf_names[USRQUOTA]);
1324
1325         if (F2FS_OPTION(sbi).s_qf_names[GRPQUOTA])
1326                 seq_show_option(seq, "grpjquota",
1327                         F2FS_OPTION(sbi).s_qf_names[GRPQUOTA]);
1328
1329         if (F2FS_OPTION(sbi).s_qf_names[PRJQUOTA])
1330                 seq_show_option(seq, "prjjquota",
1331                         F2FS_OPTION(sbi).s_qf_names[PRJQUOTA]);
1332 #endif
1333 }
1334
1335 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
1336 {
1337         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
1338
1339         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
1340                 if (test_opt(sbi, FORCE_FG_GC))
1341                         seq_printf(seq, ",background_gc=%s", "sync");
1342                 else
1343                         seq_printf(seq, ",background_gc=%s", "on");
1344         } else {
1345                 seq_printf(seq, ",background_gc=%s", "off");
1346         }
1347         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
1348                 seq_puts(seq, ",disable_roll_forward");
1349         if (test_opt(sbi, DISCARD))
1350                 seq_puts(seq, ",discard");
1351         else
1352                 seq_puts(seq, ",nodiscard");
1353         if (test_opt(sbi, NOHEAP))
1354                 seq_puts(seq, ",no_heap");
1355         else
1356                 seq_puts(seq, ",heap");
1357 #ifdef CONFIG_F2FS_FS_XATTR
1358         if (test_opt(sbi, XATTR_USER))
1359                 seq_puts(seq, ",user_xattr");
1360         else
1361                 seq_puts(seq, ",nouser_xattr");
1362         if (test_opt(sbi, INLINE_XATTR))
1363                 seq_puts(seq, ",inline_xattr");
1364         else
1365                 seq_puts(seq, ",noinline_xattr");
1366         if (test_opt(sbi, INLINE_XATTR_SIZE))
1367                 seq_printf(seq, ",inline_xattr_size=%u",
1368                                         F2FS_OPTION(sbi).inline_xattr_size);
1369 #endif
1370 #ifdef CONFIG_F2FS_FS_POSIX_ACL
1371         if (test_opt(sbi, POSIX_ACL))
1372                 seq_puts(seq, ",acl");
1373         else
1374                 seq_puts(seq, ",noacl");
1375 #endif
1376         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
1377                 seq_puts(seq, ",disable_ext_identify");
1378         if (test_opt(sbi, INLINE_DATA))
1379                 seq_puts(seq, ",inline_data");
1380         else
1381                 seq_puts(seq, ",noinline_data");
1382         if (test_opt(sbi, INLINE_DENTRY))
1383                 seq_puts(seq, ",inline_dentry");
1384         else
1385                 seq_puts(seq, ",noinline_dentry");
1386         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
1387                 seq_puts(seq, ",flush_merge");
1388         if (test_opt(sbi, NOBARRIER))
1389                 seq_puts(seq, ",nobarrier");
1390         if (test_opt(sbi, FASTBOOT))
1391                 seq_puts(seq, ",fastboot");
1392         if (test_opt(sbi, EXTENT_CACHE))
1393                 seq_puts(seq, ",extent_cache");
1394         else
1395                 seq_puts(seq, ",noextent_cache");
1396         if (test_opt(sbi, DATA_FLUSH))
1397                 seq_puts(seq, ",data_flush");
1398
1399         seq_puts(seq, ",mode=");
1400         if (test_opt(sbi, ADAPTIVE))
1401                 seq_puts(seq, "adaptive");
1402         else if (test_opt(sbi, LFS))
1403                 seq_puts(seq, "lfs");
1404         seq_printf(seq, ",active_logs=%u", F2FS_OPTION(sbi).active_logs);
1405         if (test_opt(sbi, RESERVE_ROOT))
1406                 seq_printf(seq, ",reserve_root=%u,resuid=%u,resgid=%u",
1407                                 F2FS_OPTION(sbi).root_reserved_blocks,
1408                                 from_kuid_munged(&init_user_ns,
1409                                         F2FS_OPTION(sbi).s_resuid),
1410                                 from_kgid_munged(&init_user_ns,
1411                                         F2FS_OPTION(sbi).s_resgid));
1412         if (F2FS_IO_SIZE_BITS(sbi))
1413                 seq_printf(seq, ",io_bits=%u",
1414                                 F2FS_OPTION(sbi).write_io_size_bits);
1415 #ifdef CONFIG_F2FS_FAULT_INJECTION
1416         if (test_opt(sbi, FAULT_INJECTION)) {
1417                 seq_printf(seq, ",fault_injection=%u",
1418                                 F2FS_OPTION(sbi).fault_info.inject_rate);
1419                 seq_printf(seq, ",fault_type=%u",
1420                                 F2FS_OPTION(sbi).fault_info.inject_type);
1421         }
1422 #endif
1423 #ifdef CONFIG_QUOTA
1424         if (test_opt(sbi, QUOTA))
1425                 seq_puts(seq, ",quota");
1426         if (test_opt(sbi, USRQUOTA))
1427                 seq_puts(seq, ",usrquota");
1428         if (test_opt(sbi, GRPQUOTA))
1429                 seq_puts(seq, ",grpquota");
1430         if (test_opt(sbi, PRJQUOTA))
1431                 seq_puts(seq, ",prjquota");
1432 #endif
1433         f2fs_show_quota_options(seq, sbi->sb);
1434         if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_USER)
1435                 seq_printf(seq, ",whint_mode=%s", "user-based");
1436         else if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_FS)
1437                 seq_printf(seq, ",whint_mode=%s", "fs-based");
1438 #ifdef CONFIG_FS_ENCRYPTION
1439         if (F2FS_OPTION(sbi).test_dummy_encryption)
1440                 seq_puts(seq, ",test_dummy_encryption");
1441 #endif
1442
1443         if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_DEFAULT)
1444                 seq_printf(seq, ",alloc_mode=%s", "default");
1445         else if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_REUSE)
1446                 seq_printf(seq, ",alloc_mode=%s", "reuse");
1447
1448         if (test_opt(sbi, DISABLE_CHECKPOINT))
1449                 seq_printf(seq, ",checkpoint=disable:%u",
1450                                 F2FS_OPTION(sbi).unusable_cap);
1451         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_POSIX)
1452                 seq_printf(seq, ",fsync_mode=%s", "posix");
1453         else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
1454                 seq_printf(seq, ",fsync_mode=%s", "strict");
1455         else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_NOBARRIER)
1456                 seq_printf(seq, ",fsync_mode=%s", "nobarrier");
1457         return 0;
1458 }
1459
1460 static void default_options(struct f2fs_sb_info *sbi)
1461 {
1462         /* init some FS parameters */
1463         F2FS_OPTION(sbi).active_logs = NR_CURSEG_TYPE;
1464         F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
1465         F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
1466         F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
1467         F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
1468         F2FS_OPTION(sbi).test_dummy_encryption = false;
1469         F2FS_OPTION(sbi).s_resuid = make_kuid(&init_user_ns, F2FS_DEF_RESUID);
1470         F2FS_OPTION(sbi).s_resgid = make_kgid(&init_user_ns, F2FS_DEF_RESGID);
1471
1472         set_opt(sbi, BG_GC);
1473         set_opt(sbi, INLINE_XATTR);
1474         set_opt(sbi, INLINE_DATA);
1475         set_opt(sbi, INLINE_DENTRY);
1476         set_opt(sbi, EXTENT_CACHE);
1477         set_opt(sbi, NOHEAP);
1478         clear_opt(sbi, DISABLE_CHECKPOINT);
1479         F2FS_OPTION(sbi).unusable_cap = 0;
1480         sbi->sb->s_flags |= SB_LAZYTIME;
1481         set_opt(sbi, FLUSH_MERGE);
1482         set_opt(sbi, DISCARD);
1483         if (f2fs_sb_has_blkzoned(sbi))
1484                 set_opt_mode(sbi, F2FS_MOUNT_LFS);
1485         else
1486                 set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
1487
1488 #ifdef CONFIG_F2FS_FS_XATTR
1489         set_opt(sbi, XATTR_USER);
1490 #endif
1491 #ifdef CONFIG_F2FS_FS_POSIX_ACL
1492         set_opt(sbi, POSIX_ACL);
1493 #endif
1494
1495         f2fs_build_fault_attr(sbi, 0, 0);
1496 }
1497
1498 #ifdef CONFIG_QUOTA
1499 static int f2fs_enable_quotas(struct super_block *sb);
1500 #endif
1501
1502 static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
1503 {
1504         unsigned int s_flags = sbi->sb->s_flags;
1505         struct cp_control cpc;
1506         int err = 0;
1507         int ret;
1508         block_t unusable;
1509
1510         if (s_flags & SB_RDONLY) {
1511                 f2fs_err(sbi, "checkpoint=disable on readonly fs");
1512                 return -EINVAL;
1513         }
1514         sbi->sb->s_flags |= SB_ACTIVE;
1515
1516         f2fs_update_time(sbi, DISABLE_TIME);
1517
1518         while (!f2fs_time_over(sbi, DISABLE_TIME)) {
1519                 mutex_lock(&sbi->gc_mutex);
1520                 err = f2fs_gc(sbi, true, false, NULL_SEGNO);
1521                 if (err == -ENODATA) {
1522                         err = 0;
1523                         break;
1524                 }
1525                 if (err && err != -EAGAIN)
1526                         break;
1527         }
1528
1529         ret = sync_filesystem(sbi->sb);
1530         if (ret || err) {
1531                 err = ret ? ret: err;
1532                 goto restore_flag;
1533         }
1534
1535         unusable = f2fs_get_unusable_blocks(sbi);
1536         if (f2fs_disable_cp_again(sbi, unusable)) {
1537                 err = -EAGAIN;
1538                 goto restore_flag;
1539         }
1540
1541         mutex_lock(&sbi->gc_mutex);
1542         cpc.reason = CP_PAUSE;
1543         set_sbi_flag(sbi, SBI_CP_DISABLED);
1544         err = f2fs_write_checkpoint(sbi, &cpc);
1545         if (err)
1546                 goto out_unlock;
1547
1548         spin_lock(&sbi->stat_lock);
1549         sbi->unusable_block_count = unusable;
1550         spin_unlock(&sbi->stat_lock);
1551
1552 out_unlock:
1553         mutex_unlock(&sbi->gc_mutex);
1554 restore_flag:
1555         sbi->sb->s_flags = s_flags;     /* Restore MS_RDONLY status */
1556         return err;
1557 }
1558
1559 static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
1560 {
1561         mutex_lock(&sbi->gc_mutex);
1562         f2fs_dirty_to_prefree(sbi);
1563
1564         clear_sbi_flag(sbi, SBI_CP_DISABLED);
1565         set_sbi_flag(sbi, SBI_IS_DIRTY);
1566         mutex_unlock(&sbi->gc_mutex);
1567
1568         f2fs_sync_fs(sbi->sb, 1);
1569 }
1570
1571 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
1572 {
1573         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1574         struct f2fs_mount_info org_mount_opt;
1575         unsigned long old_sb_flags;
1576         int err;
1577         bool need_restart_gc = false;
1578         bool need_stop_gc = false;
1579         bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
1580         bool disable_checkpoint = test_opt(sbi, DISABLE_CHECKPOINT);
1581         bool no_io_align = !F2FS_IO_ALIGNED(sbi);
1582         bool checkpoint_changed;
1583 #ifdef CONFIG_QUOTA
1584         int i, j;
1585 #endif
1586
1587         /*
1588          * Save the old mount options in case we
1589          * need to restore them.
1590          */
1591         org_mount_opt = sbi->mount_opt;
1592         old_sb_flags = sb->s_flags;
1593
1594 #ifdef CONFIG_QUOTA
1595         org_mount_opt.s_jquota_fmt = F2FS_OPTION(sbi).s_jquota_fmt;
1596         for (i = 0; i < MAXQUOTAS; i++) {
1597                 if (F2FS_OPTION(sbi).s_qf_names[i]) {
1598                         org_mount_opt.s_qf_names[i] =
1599                                 kstrdup(F2FS_OPTION(sbi).s_qf_names[i],
1600                                 GFP_KERNEL);
1601                         if (!org_mount_opt.s_qf_names[i]) {
1602                                 for (j = 0; j < i; j++)
1603                                         kvfree(org_mount_opt.s_qf_names[j]);
1604                                 return -ENOMEM;
1605                         }
1606                 } else {
1607                         org_mount_opt.s_qf_names[i] = NULL;
1608                 }
1609         }
1610 #endif
1611
1612         /* recover superblocks we couldn't write due to previous RO mount */
1613         if (!(*flags & SB_RDONLY) && is_sbi_flag_set(sbi, SBI_NEED_SB_WRITE)) {
1614                 err = f2fs_commit_super(sbi, false);
1615                 f2fs_info(sbi, "Try to recover all the superblocks, ret: %d",
1616                           err);
1617                 if (!err)
1618                         clear_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1619         }
1620
1621         default_options(sbi);
1622
1623         /* parse mount options */
1624         err = parse_options(sb, data);
1625         if (err)
1626                 goto restore_opts;
1627         checkpoint_changed =
1628                         disable_checkpoint != test_opt(sbi, DISABLE_CHECKPOINT);
1629
1630         /*
1631          * Previous and new state of filesystem is RO,
1632          * so skip checking GC and FLUSH_MERGE conditions.
1633          */
1634         if (f2fs_readonly(sb) && (*flags & SB_RDONLY))
1635                 goto skip;
1636
1637 #ifdef CONFIG_QUOTA
1638         if (!f2fs_readonly(sb) && (*flags & SB_RDONLY)) {
1639                 err = dquot_suspend(sb, -1);
1640                 if (err < 0)
1641                         goto restore_opts;
1642         } else if (f2fs_readonly(sb) && !(*flags & SB_RDONLY)) {
1643                 /* dquot_resume needs RW */
1644                 sb->s_flags &= ~SB_RDONLY;
1645                 if (sb_any_quota_suspended(sb)) {
1646                         dquot_resume(sb, -1);
1647                 } else if (f2fs_sb_has_quota_ino(sbi)) {
1648                         err = f2fs_enable_quotas(sb);
1649                         if (err)
1650                                 goto restore_opts;
1651                 }
1652         }
1653 #endif
1654         /* disallow enable/disable extent_cache dynamically */
1655         if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
1656                 err = -EINVAL;
1657                 f2fs_warn(sbi, "switch extent_cache option is not allowed");
1658                 goto restore_opts;
1659         }
1660
1661         if (no_io_align == !!F2FS_IO_ALIGNED(sbi)) {
1662                 err = -EINVAL;
1663                 f2fs_warn(sbi, "switch io_bits option is not allowed");
1664                 goto restore_opts;
1665         }
1666
1667         if ((*flags & SB_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
1668                 err = -EINVAL;
1669                 f2fs_warn(sbi, "disabling checkpoint not compatible with read-only");
1670                 goto restore_opts;
1671         }
1672
1673         /*
1674          * We stop the GC thread if FS is mounted as RO
1675          * or if background_gc = off is passed in mount
1676          * option. Also sync the filesystem.
1677          */
1678         if ((*flags & SB_RDONLY) || !test_opt(sbi, BG_GC)) {
1679                 if (sbi->gc_thread) {
1680                         f2fs_stop_gc_thread(sbi);
1681                         need_restart_gc = true;
1682                 }
1683         } else if (!sbi->gc_thread) {
1684                 err = f2fs_start_gc_thread(sbi);
1685                 if (err)
1686                         goto restore_opts;
1687                 need_stop_gc = true;
1688         }
1689
1690         if (*flags & SB_RDONLY ||
1691                 F2FS_OPTION(sbi).whint_mode != org_mount_opt.whint_mode) {
1692                 writeback_inodes_sb(sb, WB_REASON_SYNC);
1693                 sync_inodes_sb(sb);
1694
1695                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1696                 set_sbi_flag(sbi, SBI_IS_CLOSE);
1697                 f2fs_sync_fs(sb, 1);
1698                 clear_sbi_flag(sbi, SBI_IS_CLOSE);
1699         }
1700
1701         if (checkpoint_changed) {
1702                 if (test_opt(sbi, DISABLE_CHECKPOINT)) {
1703                         err = f2fs_disable_checkpoint(sbi);
1704                         if (err)
1705                                 goto restore_gc;
1706                 } else {
1707                         f2fs_enable_checkpoint(sbi);
1708                 }
1709         }
1710
1711         /*
1712          * We stop issue flush thread if FS is mounted as RO
1713          * or if flush_merge is not passed in mount option.
1714          */
1715         if ((*flags & SB_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
1716                 clear_opt(sbi, FLUSH_MERGE);
1717                 f2fs_destroy_flush_cmd_control(sbi, false);
1718         } else {
1719                 err = f2fs_create_flush_cmd_control(sbi);
1720                 if (err)
1721                         goto restore_gc;
1722         }
1723 skip:
1724 #ifdef CONFIG_QUOTA
1725         /* Release old quota file names */
1726         for (i = 0; i < MAXQUOTAS; i++)
1727                 kvfree(org_mount_opt.s_qf_names[i]);
1728 #endif
1729         /* Update the POSIXACL Flag */
1730         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1731                 (test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
1732
1733         limit_reserve_root(sbi);
1734         *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
1735         return 0;
1736 restore_gc:
1737         if (need_restart_gc) {
1738                 if (f2fs_start_gc_thread(sbi))
1739                         f2fs_warn(sbi, "background gc thread has stopped");
1740         } else if (need_stop_gc) {
1741                 f2fs_stop_gc_thread(sbi);
1742         }
1743 restore_opts:
1744 #ifdef CONFIG_QUOTA
1745         F2FS_OPTION(sbi).s_jquota_fmt = org_mount_opt.s_jquota_fmt;
1746         for (i = 0; i < MAXQUOTAS; i++) {
1747                 kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
1748                 F2FS_OPTION(sbi).s_qf_names[i] = org_mount_opt.s_qf_names[i];
1749         }
1750 #endif
1751         sbi->mount_opt = org_mount_opt;
1752         sb->s_flags = old_sb_flags;
1753         return err;
1754 }
1755
1756 #ifdef CONFIG_QUOTA
1757 /* Read data from quotafile */
1758 static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
1759                                size_t len, loff_t off)
1760 {
1761         struct inode *inode = sb_dqopt(sb)->files[type];
1762         struct address_space *mapping = inode->i_mapping;
1763         block_t blkidx = F2FS_BYTES_TO_BLK(off);
1764         int offset = off & (sb->s_blocksize - 1);
1765         int tocopy;
1766         size_t toread;
1767         loff_t i_size = i_size_read(inode);
1768         struct page *page;
1769         char *kaddr;
1770
1771         if (off > i_size)
1772                 return 0;
1773
1774         if (off + len > i_size)
1775                 len = i_size - off;
1776         toread = len;
1777         while (toread > 0) {
1778                 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
1779 repeat:
1780                 page = read_cache_page_gfp(mapping, blkidx, GFP_NOFS);
1781                 if (IS_ERR(page)) {
1782                         if (PTR_ERR(page) == -ENOMEM) {
1783                                 congestion_wait(BLK_RW_ASYNC, HZ/50);
1784                                 goto repeat;
1785                         }
1786                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
1787                         return PTR_ERR(page);
1788                 }
1789
1790                 lock_page(page);
1791
1792                 if (unlikely(page->mapping != mapping)) {
1793                         f2fs_put_page(page, 1);
1794                         goto repeat;
1795                 }
1796                 if (unlikely(!PageUptodate(page))) {
1797                         f2fs_put_page(page, 1);
1798                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
1799                         return -EIO;
1800                 }
1801
1802                 kaddr = kmap_atomic(page);
1803                 memcpy(data, kaddr + offset, tocopy);
1804                 kunmap_atomic(kaddr);
1805                 f2fs_put_page(page, 1);
1806
1807                 offset = 0;
1808                 toread -= tocopy;
1809                 data += tocopy;
1810                 blkidx++;
1811         }
1812         return len;
1813 }
1814
1815 /* Write to quotafile */
1816 static ssize_t f2fs_quota_write(struct super_block *sb, int type,
1817                                 const char *data, size_t len, loff_t off)
1818 {
1819         struct inode *inode = sb_dqopt(sb)->files[type];
1820         struct address_space *mapping = inode->i_mapping;
1821         const struct address_space_operations *a_ops = mapping->a_ops;
1822         int offset = off & (sb->s_blocksize - 1);
1823         size_t towrite = len;
1824         struct page *page;
1825         char *kaddr;
1826         int err = 0;
1827         int tocopy;
1828
1829         while (towrite > 0) {
1830                 tocopy = min_t(unsigned long, sb->s_blocksize - offset,
1831                                                                 towrite);
1832 retry:
1833                 err = a_ops->write_begin(NULL, mapping, off, tocopy, 0,
1834                                                         &page, NULL);
1835                 if (unlikely(err)) {
1836                         if (err == -ENOMEM) {
1837                                 congestion_wait(BLK_RW_ASYNC, HZ/50);
1838                                 goto retry;
1839                         }
1840                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
1841                         break;
1842                 }
1843
1844                 kaddr = kmap_atomic(page);
1845                 memcpy(kaddr + offset, data, tocopy);
1846                 kunmap_atomic(kaddr);
1847                 flush_dcache_page(page);
1848
1849                 a_ops->write_end(NULL, mapping, off, tocopy, tocopy,
1850                                                 page, NULL);
1851                 offset = 0;
1852                 towrite -= tocopy;
1853                 off += tocopy;
1854                 data += tocopy;
1855                 cond_resched();
1856         }
1857
1858         if (len == towrite)
1859                 return err;
1860         inode->i_mtime = inode->i_ctime = current_time(inode);
1861         f2fs_mark_inode_dirty_sync(inode, false);
1862         return len - towrite;
1863 }
1864
1865 static struct dquot **f2fs_get_dquots(struct inode *inode)
1866 {
1867         return F2FS_I(inode)->i_dquot;
1868 }
1869
1870 static qsize_t *f2fs_get_reserved_space(struct inode *inode)
1871 {
1872         return &F2FS_I(inode)->i_reserved_quota;
1873 }
1874
1875 static int f2fs_quota_on_mount(struct f2fs_sb_info *sbi, int type)
1876 {
1877         if (is_set_ckpt_flags(sbi, CP_QUOTA_NEED_FSCK_FLAG)) {
1878                 f2fs_err(sbi, "quota sysfile may be corrupted, skip loading it");
1879                 return 0;
1880         }
1881
1882         return dquot_quota_on_mount(sbi->sb, F2FS_OPTION(sbi).s_qf_names[type],
1883                                         F2FS_OPTION(sbi).s_jquota_fmt, type);
1884 }
1885
1886 int f2fs_enable_quota_files(struct f2fs_sb_info *sbi, bool rdonly)
1887 {
1888         int enabled = 0;
1889         int i, err;
1890
1891         if (f2fs_sb_has_quota_ino(sbi) && rdonly) {
1892                 err = f2fs_enable_quotas(sbi->sb);
1893                 if (err) {
1894                         f2fs_err(sbi, "Cannot turn on quota_ino: %d", err);
1895                         return 0;
1896                 }
1897                 return 1;
1898         }
1899
1900         for (i = 0; i < MAXQUOTAS; i++) {
1901                 if (F2FS_OPTION(sbi).s_qf_names[i]) {
1902                         err = f2fs_quota_on_mount(sbi, i);
1903                         if (!err) {
1904                                 enabled = 1;
1905                                 continue;
1906                         }
1907                         f2fs_err(sbi, "Cannot turn on quotas: %d on %d",
1908                                  err, i);
1909                 }
1910         }
1911         return enabled;
1912 }
1913
1914 static int f2fs_quota_enable(struct super_block *sb, int type, int format_id,
1915                              unsigned int flags)
1916 {
1917         struct inode *qf_inode;
1918         unsigned long qf_inum;
1919         int err;
1920
1921         BUG_ON(!f2fs_sb_has_quota_ino(F2FS_SB(sb)));
1922
1923         qf_inum = f2fs_qf_ino(sb, type);
1924         if (!qf_inum)
1925                 return -EPERM;
1926
1927         qf_inode = f2fs_iget(sb, qf_inum);
1928         if (IS_ERR(qf_inode)) {
1929                 f2fs_err(F2FS_SB(sb), "Bad quota inode %u:%lu", type, qf_inum);
1930                 return PTR_ERR(qf_inode);
1931         }
1932
1933         /* Don't account quota for quota files to avoid recursion */
1934         qf_inode->i_flags |= S_NOQUOTA;
1935         err = dquot_enable(qf_inode, type, format_id, flags);
1936         iput(qf_inode);
1937         return err;
1938 }
1939
1940 static int f2fs_enable_quotas(struct super_block *sb)
1941 {
1942         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1943         int type, err = 0;
1944         unsigned long qf_inum;
1945         bool quota_mopt[MAXQUOTAS] = {
1946                 test_opt(sbi, USRQUOTA),
1947                 test_opt(sbi, GRPQUOTA),
1948                 test_opt(sbi, PRJQUOTA),
1949         };
1950
1951         if (is_set_ckpt_flags(F2FS_SB(sb), CP_QUOTA_NEED_FSCK_FLAG)) {
1952                 f2fs_err(sbi, "quota file may be corrupted, skip loading it");
1953                 return 0;
1954         }
1955
1956         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1957
1958         for (type = 0; type < MAXQUOTAS; type++) {
1959                 qf_inum = f2fs_qf_ino(sb, type);
1960                 if (qf_inum) {
1961                         err = f2fs_quota_enable(sb, type, QFMT_VFS_V1,
1962                                 DQUOT_USAGE_ENABLED |
1963                                 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
1964                         if (err) {
1965                                 f2fs_err(sbi, "Failed to enable quota tracking (type=%d, err=%d). Please run fsck to fix.",
1966                                          type, err);
1967                                 for (type--; type >= 0; type--)
1968                                         dquot_quota_off(sb, type);
1969                                 set_sbi_flag(F2FS_SB(sb),
1970                                                 SBI_QUOTA_NEED_REPAIR);
1971                                 return err;
1972                         }
1973                 }
1974         }
1975         return 0;
1976 }
1977
1978 int f2fs_quota_sync(struct super_block *sb, int type)
1979 {
1980         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1981         struct quota_info *dqopt = sb_dqopt(sb);
1982         int cnt;
1983         int ret;
1984
1985         /*
1986          * do_quotactl
1987          *  f2fs_quota_sync
1988          *  down_read(quota_sem)
1989          *  dquot_writeback_dquots()
1990          *  f2fs_dquot_commit
1991          *                            block_operation
1992          *                            down_read(quota_sem)
1993          */
1994         f2fs_lock_op(sbi);
1995
1996         down_read(&sbi->quota_sem);
1997         ret = dquot_writeback_dquots(sb, type);
1998         if (ret)
1999                 goto out;
2000
2001         /*
2002          * Now when everything is written we can discard the pagecache so
2003          * that userspace sees the changes.
2004          */
2005         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2006                 struct address_space *mapping;
2007
2008                 if (type != -1 && cnt != type)
2009                         continue;
2010                 if (!sb_has_quota_active(sb, cnt))
2011                         continue;
2012
2013                 mapping = dqopt->files[cnt]->i_mapping;
2014
2015                 ret = filemap_fdatawrite(mapping);
2016                 if (ret)
2017                         goto out;
2018
2019                 /* if we are using journalled quota */
2020                 if (is_journalled_quota(sbi))
2021                         continue;
2022
2023                 ret = filemap_fdatawait(mapping);
2024                 if (ret)
2025                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
2026
2027                 inode_lock(dqopt->files[cnt]);
2028                 truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
2029                 inode_unlock(dqopt->files[cnt]);
2030         }
2031 out:
2032         if (ret)
2033                 set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
2034         up_read(&sbi->quota_sem);
2035         f2fs_unlock_op(sbi);
2036         return ret;
2037 }
2038
2039 static int f2fs_quota_on(struct super_block *sb, int type, int format_id,
2040                                                         const struct path *path)
2041 {
2042         struct inode *inode;
2043         int err;
2044
2045         /* if quota sysfile exists, deny enabling quota with specific file */
2046         if (f2fs_sb_has_quota_ino(F2FS_SB(sb))) {
2047                 f2fs_err(F2FS_SB(sb), "quota sysfile already exists");
2048                 return -EBUSY;
2049         }
2050
2051         err = f2fs_quota_sync(sb, type);
2052         if (err)
2053                 return err;
2054
2055         err = dquot_quota_on(sb, type, format_id, path);
2056         if (err)
2057                 return err;
2058
2059         inode = d_inode(path->dentry);
2060
2061         inode_lock(inode);
2062         F2FS_I(inode)->i_flags |= F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL;
2063         f2fs_set_inode_flags(inode);
2064         inode_unlock(inode);
2065         f2fs_mark_inode_dirty_sync(inode, false);
2066
2067         return 0;
2068 }
2069
2070 static int __f2fs_quota_off(struct super_block *sb, int type)
2071 {
2072         struct inode *inode = sb_dqopt(sb)->files[type];
2073         int err;
2074
2075         if (!inode || !igrab(inode))
2076                 return dquot_quota_off(sb, type);
2077
2078         err = f2fs_quota_sync(sb, type);
2079         if (err)
2080                 goto out_put;
2081
2082         err = dquot_quota_off(sb, type);
2083         if (err || f2fs_sb_has_quota_ino(F2FS_SB(sb)))
2084                 goto out_put;
2085
2086         inode_lock(inode);
2087         F2FS_I(inode)->i_flags &= ~(F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL);
2088         f2fs_set_inode_flags(inode);
2089         inode_unlock(inode);
2090         f2fs_mark_inode_dirty_sync(inode, false);
2091 out_put:
2092         iput(inode);
2093         return err;
2094 }
2095
2096 static int f2fs_quota_off(struct super_block *sb, int type)
2097 {
2098         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2099         int err;
2100
2101         err = __f2fs_quota_off(sb, type);
2102
2103         /*
2104          * quotactl can shutdown journalled quota, result in inconsistence
2105          * between quota record and fs data by following updates, tag the
2106          * flag to let fsck be aware of it.
2107          */
2108         if (is_journalled_quota(sbi))
2109                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2110         return err;
2111 }
2112
2113 void f2fs_quota_off_umount(struct super_block *sb)
2114 {
2115         int type;
2116         int err;
2117
2118         for (type = 0; type < MAXQUOTAS; type++) {
2119                 err = __f2fs_quota_off(sb, type);
2120                 if (err) {
2121                         int ret = dquot_quota_off(sb, type);
2122
2123                         f2fs_err(F2FS_SB(sb), "Fail to turn off disk quota (type: %d, err: %d, ret:%d), Please run fsck to fix it.",
2124                                  type, err, ret);
2125                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
2126                 }
2127         }
2128         /*
2129          * In case of checkpoint=disable, we must flush quota blocks.
2130          * This can cause NULL exception for node_inode in end_io, since
2131          * put_super already dropped it.
2132          */
2133         sync_filesystem(sb);
2134 }
2135
2136 static void f2fs_truncate_quota_inode_pages(struct super_block *sb)
2137 {
2138         struct quota_info *dqopt = sb_dqopt(sb);
2139         int type;
2140
2141         for (type = 0; type < MAXQUOTAS; type++) {
2142                 if (!dqopt->files[type])
2143                         continue;
2144                 f2fs_inode_synced(dqopt->files[type]);
2145         }
2146 }
2147
2148 static int f2fs_dquot_commit(struct dquot *dquot)
2149 {
2150         struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
2151         int ret;
2152
2153         down_read(&sbi->quota_sem);
2154         ret = dquot_commit(dquot);
2155         if (ret < 0)
2156                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2157         up_read(&sbi->quota_sem);
2158         return ret;
2159 }
2160
2161 static int f2fs_dquot_acquire(struct dquot *dquot)
2162 {
2163         struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
2164         int ret;
2165
2166         down_read(&sbi->quota_sem);
2167         ret = dquot_acquire(dquot);
2168         if (ret < 0)
2169                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2170         up_read(&sbi->quota_sem);
2171         return ret;
2172 }
2173
2174 static int f2fs_dquot_release(struct dquot *dquot)
2175 {
2176         struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
2177         int ret;
2178
2179         down_read(&sbi->quota_sem);
2180         ret = dquot_release(dquot);
2181         if (ret < 0)
2182                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2183         up_read(&sbi->quota_sem);
2184         return ret;
2185 }
2186
2187 static int f2fs_dquot_mark_dquot_dirty(struct dquot *dquot)
2188 {
2189         struct super_block *sb = dquot->dq_sb;
2190         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2191         int ret;
2192
2193         down_read(&sbi->quota_sem);
2194         ret = dquot_mark_dquot_dirty(dquot);
2195
2196         /* if we are using journalled quota */
2197         if (is_journalled_quota(sbi))
2198                 set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
2199
2200         up_read(&sbi->quota_sem);
2201         return ret;
2202 }
2203
2204 static int f2fs_dquot_commit_info(struct super_block *sb, int type)
2205 {
2206         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2207         int ret;
2208
2209         down_read(&sbi->quota_sem);
2210         ret = dquot_commit_info(sb, type);
2211         if (ret < 0)
2212                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2213         up_read(&sbi->quota_sem);
2214         return ret;
2215 }
2216
2217 static int f2fs_get_projid(struct inode *inode, kprojid_t *projid)
2218 {
2219         *projid = F2FS_I(inode)->i_projid;
2220         return 0;
2221 }
2222
2223 static const struct dquot_operations f2fs_quota_operations = {
2224         .get_reserved_space = f2fs_get_reserved_space,
2225         .write_dquot    = f2fs_dquot_commit,
2226         .acquire_dquot  = f2fs_dquot_acquire,
2227         .release_dquot  = f2fs_dquot_release,
2228         .mark_dirty     = f2fs_dquot_mark_dquot_dirty,
2229         .write_info     = f2fs_dquot_commit_info,
2230         .alloc_dquot    = dquot_alloc,
2231         .destroy_dquot  = dquot_destroy,
2232         .get_projid     = f2fs_get_projid,
2233         .get_next_id    = dquot_get_next_id,
2234 };
2235
2236 static const struct quotactl_ops f2fs_quotactl_ops = {
2237         .quota_on       = f2fs_quota_on,
2238         .quota_off      = f2fs_quota_off,
2239         .quota_sync     = f2fs_quota_sync,
2240         .get_state      = dquot_get_state,
2241         .set_info       = dquot_set_dqinfo,
2242         .get_dqblk      = dquot_get_dqblk,
2243         .set_dqblk      = dquot_set_dqblk,
2244         .get_nextdqblk  = dquot_get_next_dqblk,
2245 };
2246 #else
2247 int f2fs_quota_sync(struct super_block *sb, int type)
2248 {
2249         return 0;
2250 }
2251
2252 void f2fs_quota_off_umount(struct super_block *sb)
2253 {
2254 }
2255 #endif
2256
2257 static const struct super_operations f2fs_sops = {
2258         .alloc_inode    = f2fs_alloc_inode,
2259         .free_inode     = f2fs_free_inode,
2260         .drop_inode     = f2fs_drop_inode,
2261         .write_inode    = f2fs_write_inode,
2262         .dirty_inode    = f2fs_dirty_inode,
2263         .show_options   = f2fs_show_options,
2264 #ifdef CONFIG_QUOTA
2265         .quota_read     = f2fs_quota_read,
2266         .quota_write    = f2fs_quota_write,
2267         .get_dquots     = f2fs_get_dquots,
2268 #endif
2269         .evict_inode    = f2fs_evict_inode,
2270         .put_super      = f2fs_put_super,
2271         .sync_fs        = f2fs_sync_fs,
2272         .freeze_fs      = f2fs_freeze,
2273         .unfreeze_fs    = f2fs_unfreeze,
2274         .statfs         = f2fs_statfs,
2275         .remount_fs     = f2fs_remount,
2276 };
2277
2278 #ifdef CONFIG_FS_ENCRYPTION
2279 static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
2280 {
2281         return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
2282                                 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
2283                                 ctx, len, NULL);
2284 }
2285
2286 static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
2287                                                         void *fs_data)
2288 {
2289         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2290
2291         /*
2292          * Encrypting the root directory is not allowed because fsck
2293          * expects lost+found directory to exist and remain unencrypted
2294          * if LOST_FOUND feature is enabled.
2295          *
2296          */
2297         if (f2fs_sb_has_lost_found(sbi) &&
2298                         inode->i_ino == F2FS_ROOT_INO(sbi))
2299                 return -EPERM;
2300
2301         return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
2302                                 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
2303                                 ctx, len, fs_data, XATTR_CREATE);
2304 }
2305
2306 static bool f2fs_dummy_context(struct inode *inode)
2307 {
2308         return DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(inode));
2309 }
2310
2311 static const struct fscrypt_operations f2fs_cryptops = {
2312         .key_prefix     = "f2fs:",
2313         .get_context    = f2fs_get_context,
2314         .set_context    = f2fs_set_context,
2315         .dummy_context  = f2fs_dummy_context,
2316         .empty_dir      = f2fs_empty_dir,
2317         .max_namelen    = F2FS_NAME_LEN,
2318 };
2319 #endif
2320
2321 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
2322                 u64 ino, u32 generation)
2323 {
2324         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2325         struct inode *inode;
2326
2327         if (f2fs_check_nid_range(sbi, ino))
2328                 return ERR_PTR(-ESTALE);
2329
2330         /*
2331          * f2fs_iget isn't quite right if the inode is currently unallocated!
2332          * However f2fs_iget currently does appropriate checks to handle stale
2333          * inodes so everything is OK.
2334          */
2335         inode = f2fs_iget(sb, ino);
2336         if (IS_ERR(inode))
2337                 return ERR_CAST(inode);
2338         if (unlikely(generation && inode->i_generation != generation)) {
2339                 /* we didn't find the right inode.. */
2340                 iput(inode);
2341                 return ERR_PTR(-ESTALE);
2342         }
2343         return inode;
2344 }
2345
2346 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
2347                 int fh_len, int fh_type)
2348 {
2349         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
2350                                     f2fs_nfs_get_inode);
2351 }
2352
2353 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
2354                 int fh_len, int fh_type)
2355 {
2356         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
2357                                     f2fs_nfs_get_inode);
2358 }
2359
2360 static const struct export_operations f2fs_export_ops = {
2361         .fh_to_dentry = f2fs_fh_to_dentry,
2362         .fh_to_parent = f2fs_fh_to_parent,
2363         .get_parent = f2fs_get_parent,
2364 };
2365
2366 static loff_t max_file_blocks(void)
2367 {
2368         loff_t result = 0;
2369         loff_t leaf_count = DEF_ADDRS_PER_BLOCK;
2370
2371         /*
2372          * note: previously, result is equal to (DEF_ADDRS_PER_INODE -
2373          * DEFAULT_INLINE_XATTR_ADDRS), but now f2fs try to reserve more
2374          * space in inode.i_addr, it will be more safe to reassign
2375          * result as zero.
2376          */
2377
2378         /* two direct node blocks */
2379         result += (leaf_count * 2);
2380
2381         /* two indirect node blocks */
2382         leaf_count *= NIDS_PER_BLOCK;
2383         result += (leaf_count * 2);
2384
2385         /* one double indirect node block */
2386         leaf_count *= NIDS_PER_BLOCK;
2387         result += leaf_count;
2388
2389         return result;
2390 }
2391
2392 static int __f2fs_commit_super(struct buffer_head *bh,
2393                         struct f2fs_super_block *super)
2394 {
2395         lock_buffer(bh);
2396         if (super)
2397                 memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
2398         set_buffer_dirty(bh);
2399         unlock_buffer(bh);
2400
2401         /* it's rare case, we can do fua all the time */
2402         return __sync_dirty_buffer(bh, REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
2403 }
2404
2405 static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
2406                                         struct buffer_head *bh)
2407 {
2408         struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
2409                                         (bh->b_data + F2FS_SUPER_OFFSET);
2410         struct super_block *sb = sbi->sb;
2411         u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
2412         u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr);
2413         u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr);
2414         u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr);
2415         u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
2416         u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
2417         u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt);
2418         u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit);
2419         u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat);
2420         u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa);
2421         u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main);
2422         u32 segment_count = le32_to_cpu(raw_super->segment_count);
2423         u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
2424         u64 main_end_blkaddr = main_blkaddr +
2425                                 (segment_count_main << log_blocks_per_seg);
2426         u64 seg_end_blkaddr = segment0_blkaddr +
2427                                 (segment_count << log_blocks_per_seg);
2428
2429         if (segment0_blkaddr != cp_blkaddr) {
2430                 f2fs_info(sbi, "Mismatch start address, segment0(%u) cp_blkaddr(%u)",
2431                           segment0_blkaddr, cp_blkaddr);
2432                 return true;
2433         }
2434
2435         if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) !=
2436                                                         sit_blkaddr) {
2437                 f2fs_info(sbi, "Wrong CP boundary, start(%u) end(%u) blocks(%u)",
2438                           cp_blkaddr, sit_blkaddr,
2439                           segment_count_ckpt << log_blocks_per_seg);
2440                 return true;
2441         }
2442
2443         if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) !=
2444                                                         nat_blkaddr) {
2445                 f2fs_info(sbi, "Wrong SIT boundary, start(%u) end(%u) blocks(%u)",
2446                           sit_blkaddr, nat_blkaddr,
2447                           segment_count_sit << log_blocks_per_seg);
2448                 return true;
2449         }
2450
2451         if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) !=
2452                                                         ssa_blkaddr) {
2453                 f2fs_info(sbi, "Wrong NAT boundary, start(%u) end(%u) blocks(%u)",
2454                           nat_blkaddr, ssa_blkaddr,
2455                           segment_count_nat << log_blocks_per_seg);
2456                 return true;
2457         }
2458
2459         if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) !=
2460                                                         main_blkaddr) {
2461                 f2fs_info(sbi, "Wrong SSA boundary, start(%u) end(%u) blocks(%u)",
2462                           ssa_blkaddr, main_blkaddr,
2463                           segment_count_ssa << log_blocks_per_seg);
2464                 return true;
2465         }
2466
2467         if (main_end_blkaddr > seg_end_blkaddr) {
2468                 f2fs_info(sbi, "Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
2469                           main_blkaddr,
2470                           segment0_blkaddr +
2471                           (segment_count << log_blocks_per_seg),
2472                           segment_count_main << log_blocks_per_seg);
2473                 return true;
2474         } else if (main_end_blkaddr < seg_end_blkaddr) {
2475                 int err = 0;
2476                 char *res;
2477
2478                 /* fix in-memory information all the time */
2479                 raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
2480                                 segment0_blkaddr) >> log_blocks_per_seg);
2481
2482                 if (f2fs_readonly(sb) || bdev_read_only(sb->s_bdev)) {
2483                         set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
2484                         res = "internally";
2485                 } else {
2486                         err = __f2fs_commit_super(bh, NULL);
2487                         res = err ? "failed" : "done";
2488                 }
2489                 f2fs_info(sbi, "Fix alignment : %s, start(%u) end(%u) block(%u)",
2490                           res, main_blkaddr,
2491                           segment0_blkaddr +
2492                           (segment_count << log_blocks_per_seg),
2493                           segment_count_main << log_blocks_per_seg);
2494                 if (err)
2495                         return true;
2496         }
2497         return false;
2498 }
2499
2500 static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
2501                                 struct buffer_head *bh)
2502 {
2503         block_t segment_count, segs_per_sec, secs_per_zone;
2504         block_t total_sections, blocks_per_seg;
2505         struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
2506                                         (bh->b_data + F2FS_SUPER_OFFSET);
2507         unsigned int blocksize;
2508         size_t crc_offset = 0;
2509         __u32 crc = 0;
2510
2511         if (le32_to_cpu(raw_super->magic) != F2FS_SUPER_MAGIC) {
2512                 f2fs_info(sbi, "Magic Mismatch, valid(0x%x) - read(0x%x)",
2513                           F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
2514                 return -EINVAL;
2515         }
2516
2517         /* Check checksum_offset and crc in superblock */
2518         if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_SB_CHKSUM)) {
2519                 crc_offset = le32_to_cpu(raw_super->checksum_offset);
2520                 if (crc_offset !=
2521                         offsetof(struct f2fs_super_block, crc)) {
2522                         f2fs_info(sbi, "Invalid SB checksum offset: %zu",
2523                                   crc_offset);
2524                         return -EFSCORRUPTED;
2525                 }
2526                 crc = le32_to_cpu(raw_super->crc);
2527                 if (!f2fs_crc_valid(sbi, crc, raw_super, crc_offset)) {
2528                         f2fs_info(sbi, "Invalid SB checksum value: %u", crc);
2529                         return -EFSCORRUPTED;
2530                 }
2531         }
2532
2533         /* Currently, support only 4KB page cache size */
2534         if (F2FS_BLKSIZE != PAGE_SIZE) {
2535                 f2fs_info(sbi, "Invalid page_cache_size (%lu), supports only 4KB",
2536                           PAGE_SIZE);
2537                 return -EFSCORRUPTED;
2538         }
2539
2540         /* Currently, support only 4KB block size */
2541         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
2542         if (blocksize != F2FS_BLKSIZE) {
2543                 f2fs_info(sbi, "Invalid blocksize (%u), supports only 4KB",
2544                           blocksize);
2545                 return -EFSCORRUPTED;
2546         }
2547
2548         /* check log blocks per segment */
2549         if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
2550                 f2fs_info(sbi, "Invalid log blocks per segment (%u)",
2551                           le32_to_cpu(raw_super->log_blocks_per_seg));
2552                 return -EFSCORRUPTED;
2553         }
2554
2555         /* Currently, support 512/1024/2048/4096 bytes sector size */
2556         if (le32_to_cpu(raw_super->log_sectorsize) >
2557                                 F2FS_MAX_LOG_SECTOR_SIZE ||
2558                 le32_to_cpu(raw_super->log_sectorsize) <
2559                                 F2FS_MIN_LOG_SECTOR_SIZE) {
2560                 f2fs_info(sbi, "Invalid log sectorsize (%u)",
2561                           le32_to_cpu(raw_super->log_sectorsize));
2562                 return -EFSCORRUPTED;
2563         }
2564         if (le32_to_cpu(raw_super->log_sectors_per_block) +
2565                 le32_to_cpu(raw_super->log_sectorsize) !=
2566                         F2FS_MAX_LOG_SECTOR_SIZE) {
2567                 f2fs_info(sbi, "Invalid log sectors per block(%u) log sectorsize(%u)",
2568                           le32_to_cpu(raw_super->log_sectors_per_block),
2569                           le32_to_cpu(raw_super->log_sectorsize));
2570                 return -EFSCORRUPTED;
2571         }
2572
2573         segment_count = le32_to_cpu(raw_super->segment_count);
2574         segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
2575         secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
2576         total_sections = le32_to_cpu(raw_super->section_count);
2577
2578         /* blocks_per_seg should be 512, given the above check */
2579         blocks_per_seg = 1 << le32_to_cpu(raw_super->log_blocks_per_seg);
2580
2581         if (segment_count > F2FS_MAX_SEGMENT ||
2582                                 segment_count < F2FS_MIN_SEGMENTS) {
2583                 f2fs_info(sbi, "Invalid segment count (%u)", segment_count);
2584                 return -EFSCORRUPTED;
2585         }
2586
2587         if (total_sections > segment_count ||
2588                         total_sections < F2FS_MIN_SEGMENTS ||
2589                         segs_per_sec > segment_count || !segs_per_sec) {
2590                 f2fs_info(sbi, "Invalid segment/section count (%u, %u x %u)",
2591                           segment_count, total_sections, segs_per_sec);
2592                 return -EFSCORRUPTED;
2593         }
2594
2595         if ((segment_count / segs_per_sec) < total_sections) {
2596                 f2fs_info(sbi, "Small segment_count (%u < %u * %u)",
2597                           segment_count, segs_per_sec, total_sections);
2598                 return -EFSCORRUPTED;
2599         }
2600
2601         if (segment_count > (le64_to_cpu(raw_super->block_count) >> 9)) {
2602                 f2fs_info(sbi, "Wrong segment_count / block_count (%u > %llu)",
2603                           segment_count, le64_to_cpu(raw_super->block_count));
2604                 return -EFSCORRUPTED;
2605         }
2606
2607         if (secs_per_zone > total_sections || !secs_per_zone) {
2608                 f2fs_info(sbi, "Wrong secs_per_zone / total_sections (%u, %u)",
2609                           secs_per_zone, total_sections);
2610                 return -EFSCORRUPTED;
2611         }
2612         if (le32_to_cpu(raw_super->extension_count) > F2FS_MAX_EXTENSION ||
2613                         raw_super->hot_ext_count > F2FS_MAX_EXTENSION ||
2614                         (le32_to_cpu(raw_super->extension_count) +
2615                         raw_super->hot_ext_count) > F2FS_MAX_EXTENSION) {
2616                 f2fs_info(sbi, "Corrupted extension count (%u + %u > %u)",
2617                           le32_to_cpu(raw_super->extension_count),
2618                           raw_super->hot_ext_count,
2619                           F2FS_MAX_EXTENSION);
2620                 return -EFSCORRUPTED;
2621         }
2622
2623         if (le32_to_cpu(raw_super->cp_payload) >
2624                                 (blocks_per_seg - F2FS_CP_PACKS)) {
2625                 f2fs_info(sbi, "Insane cp_payload (%u > %u)",
2626                           le32_to_cpu(raw_super->cp_payload),
2627                           blocks_per_seg - F2FS_CP_PACKS);
2628                 return -EFSCORRUPTED;
2629         }
2630
2631         /* check reserved ino info */
2632         if (le32_to_cpu(raw_super->node_ino) != 1 ||
2633                 le32_to_cpu(raw_super->meta_ino) != 2 ||
2634                 le32_to_cpu(raw_super->root_ino) != 3) {
2635                 f2fs_info(sbi, "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)",
2636                           le32_to_cpu(raw_super->node_ino),
2637                           le32_to_cpu(raw_super->meta_ino),
2638                           le32_to_cpu(raw_super->root_ino));
2639                 return -EFSCORRUPTED;
2640         }
2641
2642         /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
2643         if (sanity_check_area_boundary(sbi, bh))
2644                 return -EFSCORRUPTED;
2645
2646         return 0;
2647 }
2648
2649 int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
2650 {
2651         unsigned int total, fsmeta;
2652         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
2653         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
2654         unsigned int ovp_segments, reserved_segments;
2655         unsigned int main_segs, blocks_per_seg;
2656         unsigned int sit_segs, nat_segs;
2657         unsigned int sit_bitmap_size, nat_bitmap_size;
2658         unsigned int log_blocks_per_seg;
2659         unsigned int segment_count_main;
2660         unsigned int cp_pack_start_sum, cp_payload;
2661         block_t user_block_count, valid_user_blocks;
2662         block_t avail_node_count, valid_node_count;
2663         int i, j;
2664
2665         total = le32_to_cpu(raw_super->segment_count);
2666         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
2667         sit_segs = le32_to_cpu(raw_super->segment_count_sit);
2668         fsmeta += sit_segs;
2669         nat_segs = le32_to_cpu(raw_super->segment_count_nat);
2670         fsmeta += nat_segs;
2671         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
2672         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
2673
2674         if (unlikely(fsmeta >= total))
2675                 return 1;
2676
2677         ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
2678         reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
2679
2680         if (unlikely(fsmeta < F2FS_MIN_SEGMENTS ||
2681                         ovp_segments == 0 || reserved_segments == 0)) {
2682                 f2fs_err(sbi, "Wrong layout: check mkfs.f2fs version");
2683                 return 1;
2684         }
2685
2686         user_block_count = le64_to_cpu(ckpt->user_block_count);
2687         segment_count_main = le32_to_cpu(raw_super->segment_count_main);
2688         log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
2689         if (!user_block_count || user_block_count >=
2690                         segment_count_main << log_blocks_per_seg) {
2691                 f2fs_err(sbi, "Wrong user_block_count: %u",
2692                          user_block_count);
2693                 return 1;
2694         }
2695
2696         valid_user_blocks = le64_to_cpu(ckpt->valid_block_count);
2697         if (valid_user_blocks > user_block_count) {
2698                 f2fs_err(sbi, "Wrong valid_user_blocks: %u, user_block_count: %u",
2699                          valid_user_blocks, user_block_count);
2700                 return 1;
2701         }
2702
2703         valid_node_count = le32_to_cpu(ckpt->valid_node_count);
2704         avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
2705         if (valid_node_count > avail_node_count) {
2706                 f2fs_err(sbi, "Wrong valid_node_count: %u, avail_node_count: %u",
2707                          valid_node_count, avail_node_count);
2708                 return 1;
2709         }
2710
2711         main_segs = le32_to_cpu(raw_super->segment_count_main);
2712         blocks_per_seg = sbi->blocks_per_seg;
2713
2714         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
2715                 if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
2716                         le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg)
2717                         return 1;
2718                 for (j = i + 1; j < NR_CURSEG_NODE_TYPE; j++) {
2719                         if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
2720                                 le32_to_cpu(ckpt->cur_node_segno[j])) {
2721                                 f2fs_err(sbi, "Node segment (%u, %u) has the same segno: %u",
2722                                          i, j,
2723                                          le32_to_cpu(ckpt->cur_node_segno[i]));
2724                                 return 1;
2725                         }
2726                 }
2727         }
2728         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
2729                 if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
2730                         le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg)
2731                         return 1;
2732                 for (j = i + 1; j < NR_CURSEG_DATA_TYPE; j++) {
2733                         if (le32_to_cpu(ckpt->cur_data_segno[i]) ==
2734                                 le32_to_cpu(ckpt->cur_data_segno[j])) {
2735                                 f2fs_err(sbi, "Data segment (%u, %u) has the same segno: %u",
2736                                          i, j,
2737                                          le32_to_cpu(ckpt->cur_data_segno[i]));
2738                                 return 1;
2739                         }
2740                 }
2741         }
2742         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
2743                 for (j = 0; j < NR_CURSEG_DATA_TYPE; j++) {
2744                         if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
2745                                 le32_to_cpu(ckpt->cur_data_segno[j])) {
2746                                 f2fs_err(sbi, "Node segment (%u) and Data segment (%u) has the same segno: %u",
2747                                          i, j,
2748                                          le32_to_cpu(ckpt->cur_node_segno[i]));
2749                                 return 1;
2750                         }
2751                 }
2752         }
2753
2754         sit_bitmap_size = le32_to_cpu(ckpt->sit_ver_bitmap_bytesize);
2755         nat_bitmap_size = le32_to_cpu(ckpt->nat_ver_bitmap_bytesize);
2756
2757         if (sit_bitmap_size != ((sit_segs / 2) << log_blocks_per_seg) / 8 ||
2758                 nat_bitmap_size != ((nat_segs / 2) << log_blocks_per_seg) / 8) {
2759                 f2fs_err(sbi, "Wrong bitmap size: sit: %u, nat:%u",
2760                          sit_bitmap_size, nat_bitmap_size);
2761                 return 1;
2762         }
2763
2764         cp_pack_start_sum = __start_sum_addr(sbi);
2765         cp_payload = __cp_payload(sbi);
2766         if (cp_pack_start_sum < cp_payload + 1 ||
2767                 cp_pack_start_sum > blocks_per_seg - 1 -
2768                         NR_CURSEG_TYPE) {
2769                 f2fs_err(sbi, "Wrong cp_pack_start_sum: %u",
2770                          cp_pack_start_sum);
2771                 return 1;
2772         }
2773
2774         if (__is_set_ckpt_flags(ckpt, CP_LARGE_NAT_BITMAP_FLAG) &&
2775                 le32_to_cpu(ckpt->checksum_offset) != CP_MIN_CHKSUM_OFFSET) {
2776                 f2fs_warn(sbi, "using deprecated layout of large_nat_bitmap, "
2777                           "please run fsck v1.13.0 or higher to repair, chksum_offset: %u, "
2778                           "fixed with patch: \"f2fs-tools: relocate chksum_offset for large_nat_bitmap feature\"",
2779                           le32_to_cpu(ckpt->checksum_offset));
2780                 return 1;
2781         }
2782
2783         if (unlikely(f2fs_cp_error(sbi))) {
2784                 f2fs_err(sbi, "A bug case: need to run fsck");
2785                 return 1;
2786         }
2787         return 0;
2788 }
2789
2790 static void init_sb_info(struct f2fs_sb_info *sbi)
2791 {
2792         struct f2fs_super_block *raw_super = sbi->raw_super;
2793         int i;
2794
2795         sbi->log_sectors_per_block =
2796                 le32_to_cpu(raw_super->log_sectors_per_block);
2797         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
2798         sbi->blocksize = 1 << sbi->log_blocksize;
2799         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
2800         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
2801         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
2802         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
2803         sbi->total_sections = le32_to_cpu(raw_super->section_count);
2804         sbi->total_node_count =
2805                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
2806                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
2807         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
2808         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
2809         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
2810         sbi->cur_victim_sec = NULL_SECNO;
2811         sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
2812         sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
2813         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
2814         sbi->migration_granularity = sbi->segs_per_sec;
2815
2816         sbi->dir_level = DEF_DIR_LEVEL;
2817         sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
2818         sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
2819         sbi->interval_time[DISCARD_TIME] = DEF_IDLE_INTERVAL;
2820         sbi->interval_time[GC_TIME] = DEF_IDLE_INTERVAL;
2821         sbi->interval_time[DISABLE_TIME] = DEF_DISABLE_INTERVAL;
2822         sbi->interval_time[UMOUNT_DISCARD_TIMEOUT] =
2823                                 DEF_UMOUNT_DISCARD_TIMEOUT;
2824         clear_sbi_flag(sbi, SBI_NEED_FSCK);
2825
2826         for (i = 0; i < NR_COUNT_TYPE; i++)
2827                 atomic_set(&sbi->nr_pages[i], 0);
2828
2829         for (i = 0; i < META; i++)
2830                 atomic_set(&sbi->wb_sync_req[i], 0);
2831
2832         INIT_LIST_HEAD(&sbi->s_list);
2833         mutex_init(&sbi->umount_mutex);
2834         init_rwsem(&sbi->io_order_lock);
2835         spin_lock_init(&sbi->cp_lock);
2836
2837         sbi->dirty_device = 0;
2838         spin_lock_init(&sbi->dev_lock);
2839
2840         init_rwsem(&sbi->sb_lock);
2841 }
2842
2843 static int init_percpu_info(struct f2fs_sb_info *sbi)
2844 {
2845         int err;
2846
2847         err = percpu_counter_init(&sbi->alloc_valid_block_count, 0, GFP_KERNEL);
2848         if (err)
2849                 return err;
2850
2851         err = percpu_counter_init(&sbi->total_valid_inode_count, 0,
2852                                                                 GFP_KERNEL);
2853         if (err)
2854                 percpu_counter_destroy(&sbi->alloc_valid_block_count);
2855
2856         return err;
2857 }
2858
2859 #ifdef CONFIG_BLK_DEV_ZONED
2860 static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
2861 {
2862         struct block_device *bdev = FDEV(devi).bdev;
2863         sector_t nr_sectors = bdev->bd_part->nr_sects;
2864         sector_t sector = 0;
2865         struct blk_zone *zones;
2866         unsigned int i, nr_zones;
2867         unsigned int n = 0;
2868         int err = -EIO;
2869
2870         if (!f2fs_sb_has_blkzoned(sbi))
2871                 return 0;
2872
2873         if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
2874                                 SECTOR_TO_BLOCK(bdev_zone_sectors(bdev)))
2875                 return -EINVAL;
2876         sbi->blocks_per_blkz = SECTOR_TO_BLOCK(bdev_zone_sectors(bdev));
2877         if (sbi->log_blocks_per_blkz && sbi->log_blocks_per_blkz !=
2878                                 __ilog2_u32(sbi->blocks_per_blkz))
2879                 return -EINVAL;
2880         sbi->log_blocks_per_blkz = __ilog2_u32(sbi->blocks_per_blkz);
2881         FDEV(devi).nr_blkz = SECTOR_TO_BLOCK(nr_sectors) >>
2882                                         sbi->log_blocks_per_blkz;
2883         if (nr_sectors & (bdev_zone_sectors(bdev) - 1))
2884                 FDEV(devi).nr_blkz++;
2885
2886         FDEV(devi).blkz_seq = f2fs_kzalloc(sbi,
2887                                         BITS_TO_LONGS(FDEV(devi).nr_blkz)
2888                                         * sizeof(unsigned long),
2889                                         GFP_KERNEL);
2890         if (!FDEV(devi).blkz_seq)
2891                 return -ENOMEM;
2892
2893 #define F2FS_REPORT_NR_ZONES   4096
2894
2895         zones = f2fs_kzalloc(sbi,
2896                              array_size(F2FS_REPORT_NR_ZONES,
2897                                         sizeof(struct blk_zone)),
2898                              GFP_KERNEL);
2899         if (!zones)
2900                 return -ENOMEM;
2901
2902         /* Get block zones type */
2903         while (zones && sector < nr_sectors) {
2904
2905                 nr_zones = F2FS_REPORT_NR_ZONES;
2906                 err = blkdev_report_zones(bdev, sector, zones, &nr_zones);
2907                 if (err)
2908                         break;
2909                 if (!nr_zones) {
2910                         err = -EIO;
2911                         break;
2912                 }
2913
2914                 for (i = 0; i < nr_zones; i++) {
2915                         if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL)
2916                                 set_bit(n, FDEV(devi).blkz_seq);
2917                         sector += zones[i].len;
2918                         n++;
2919                 }
2920         }
2921
2922         kvfree(zones);
2923
2924         return err;
2925 }
2926 #endif
2927
2928 /*
2929  * Read f2fs raw super block.
2930  * Because we have two copies of super block, so read both of them
2931  * to get the first valid one. If any one of them is broken, we pass
2932  * them recovery flag back to the caller.
2933  */
2934 static int read_raw_super_block(struct f2fs_sb_info *sbi,
2935                         struct f2fs_super_block **raw_super,
2936                         int *valid_super_block, int *recovery)
2937 {
2938         struct super_block *sb = sbi->sb;
2939         int block;
2940         struct buffer_head *bh;
2941         struct f2fs_super_block *super;
2942         int err = 0;
2943
2944         super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
2945         if (!super)
2946                 return -ENOMEM;
2947
2948         for (block = 0; block < 2; block++) {
2949                 bh = sb_bread(sb, block);
2950                 if (!bh) {
2951                         f2fs_err(sbi, "Unable to read %dth superblock",
2952                                  block + 1);
2953                         err = -EIO;
2954                         continue;
2955                 }
2956
2957                 /* sanity checking of raw super */
2958                 err = sanity_check_raw_super(sbi, bh);
2959                 if (err) {
2960                         f2fs_err(sbi, "Can't find valid F2FS filesystem in %dth superblock",
2961                                  block + 1);
2962                         brelse(bh);
2963                         continue;
2964                 }
2965
2966                 if (!*raw_super) {
2967                         memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
2968                                                         sizeof(*super));
2969                         *valid_super_block = block;
2970                         *raw_super = super;
2971                 }
2972                 brelse(bh);
2973         }
2974
2975         /* Fail to read any one of the superblocks*/
2976         if (err < 0)
2977                 *recovery = 1;
2978
2979         /* No valid superblock */
2980         if (!*raw_super)
2981                 kvfree(super);
2982         else
2983                 err = 0;
2984
2985         return err;
2986 }
2987
2988 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
2989 {
2990         struct buffer_head *bh;
2991         __u32 crc = 0;
2992         int err;
2993
2994         if ((recover && f2fs_readonly(sbi->sb)) ||
2995                                 bdev_read_only(sbi->sb->s_bdev)) {
2996                 set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
2997                 return -EROFS;
2998         }
2999
3000         /* we should update superblock crc here */
3001         if (!recover && f2fs_sb_has_sb_chksum(sbi)) {
3002                 crc = f2fs_crc32(sbi, F2FS_RAW_SUPER(sbi),
3003                                 offsetof(struct f2fs_super_block, crc));
3004                 F2FS_RAW_SUPER(sbi)->crc = cpu_to_le32(crc);
3005         }
3006
3007         /* write back-up superblock first */
3008         bh = sb_bread(sbi->sb, sbi->valid_super_block ? 0 : 1);
3009         if (!bh)
3010                 return -EIO;
3011         err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
3012         brelse(bh);
3013
3014         /* if we are in recovery path, skip writing valid superblock */
3015         if (recover || err)
3016                 return err;
3017
3018         /* write current valid superblock */
3019         bh = sb_bread(sbi->sb, sbi->valid_super_block);
3020         if (!bh)
3021                 return -EIO;
3022         err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
3023         brelse(bh);
3024         return err;
3025 }
3026
3027 static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
3028 {
3029         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
3030         unsigned int max_devices = MAX_DEVICES;
3031         int i;
3032
3033         /* Initialize single device information */
3034         if (!RDEV(0).path[0]) {
3035                 if (!bdev_is_zoned(sbi->sb->s_bdev))
3036                         return 0;
3037                 max_devices = 1;
3038         }
3039
3040         /*
3041          * Initialize multiple devices information, or single
3042          * zoned block device information.
3043          */
3044         sbi->devs = f2fs_kzalloc(sbi,
3045                                  array_size(max_devices,
3046                                             sizeof(struct f2fs_dev_info)),
3047                                  GFP_KERNEL);
3048         if (!sbi->devs)
3049                 return -ENOMEM;
3050
3051         for (i = 0; i < max_devices; i++) {
3052
3053                 if (i > 0 && !RDEV(i).path[0])
3054                         break;
3055
3056                 if (max_devices == 1) {
3057                         /* Single zoned block device mount */
3058                         FDEV(0).bdev =
3059                                 blkdev_get_by_dev(sbi->sb->s_bdev->bd_dev,
3060                                         sbi->sb->s_mode, sbi->sb->s_type);
3061                 } else {
3062                         /* Multi-device mount */
3063                         memcpy(FDEV(i).path, RDEV(i).path, MAX_PATH_LEN);
3064                         FDEV(i).total_segments =
3065                                 le32_to_cpu(RDEV(i).total_segments);
3066                         if (i == 0) {
3067                                 FDEV(i).start_blk = 0;
3068                                 FDEV(i).end_blk = FDEV(i).start_blk +
3069                                     (FDEV(i).total_segments <<
3070                                     sbi->log_blocks_per_seg) - 1 +
3071                                     le32_to_cpu(raw_super->segment0_blkaddr);
3072                         } else {
3073                                 FDEV(i).start_blk = FDEV(i - 1).end_blk + 1;
3074                                 FDEV(i).end_blk = FDEV(i).start_blk +
3075                                         (FDEV(i).total_segments <<
3076                                         sbi->log_blocks_per_seg) - 1;
3077                         }
3078                         FDEV(i).bdev = blkdev_get_by_path(FDEV(i).path,
3079                                         sbi->sb->s_mode, sbi->sb->s_type);
3080                 }
3081                 if (IS_ERR(FDEV(i).bdev))
3082                         return PTR_ERR(FDEV(i).bdev);
3083
3084                 /* to release errored devices */
3085                 sbi->s_ndevs = i + 1;
3086
3087 #ifdef CONFIG_BLK_DEV_ZONED
3088                 if (bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HM &&
3089                                 !f2fs_sb_has_blkzoned(sbi)) {
3090                         f2fs_err(sbi, "Zoned block device feature not enabled\n");
3091                         return -EINVAL;
3092                 }
3093                 if (bdev_zoned_model(FDEV(i).bdev) != BLK_ZONED_NONE) {
3094                         if (init_blkz_info(sbi, i)) {
3095                                 f2fs_err(sbi, "Failed to initialize F2FS blkzone information");
3096                                 return -EINVAL;
3097                         }
3098                         if (max_devices == 1)
3099                                 break;
3100                         f2fs_info(sbi, "Mount Device [%2d]: %20s, %8u, %8x - %8x (zone: %s)",
3101                                   i, FDEV(i).path,
3102                                   FDEV(i).total_segments,
3103                                   FDEV(i).start_blk, FDEV(i).end_blk,
3104                                   bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HA ?
3105                                   "Host-aware" : "Host-managed");
3106                         continue;
3107                 }
3108 #endif
3109                 f2fs_info(sbi, "Mount Device [%2d]: %20s, %8u, %8x - %8x",
3110                           i, FDEV(i).path,
3111                           FDEV(i).total_segments,
3112                           FDEV(i).start_blk, FDEV(i).end_blk);
3113         }
3114         f2fs_info(sbi,
3115                   "IO Block Size: %8d KB", F2FS_IO_SIZE_KB(sbi));
3116         return 0;
3117 }
3118
3119 static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
3120 {
3121 #ifdef CONFIG_UNICODE
3122         if (f2fs_sb_has_casefold(sbi) && !sbi->s_encoding) {
3123                 const struct f2fs_sb_encodings *encoding_info;
3124                 struct unicode_map *encoding;
3125                 __u16 encoding_flags;
3126
3127                 if (f2fs_sb_has_encrypt(sbi)) {
3128                         f2fs_err(sbi,
3129                                 "Can't mount with encoding and encryption");
3130                         return -EINVAL;
3131                 }
3132
3133                 if (f2fs_sb_read_encoding(sbi->raw_super, &encoding_info,
3134                                           &encoding_flags)) {
3135                         f2fs_err(sbi,
3136                                  "Encoding requested by superblock is unknown");
3137                         return -EINVAL;
3138                 }
3139
3140                 encoding = utf8_load(encoding_info->version);
3141                 if (IS_ERR(encoding)) {
3142                         f2fs_err(sbi,
3143                                  "can't mount with superblock charset: %s-%s "
3144                                  "not supported by the kernel. flags: 0x%x.",
3145                                  encoding_info->name, encoding_info->version,
3146                                  encoding_flags);
3147                         return PTR_ERR(encoding);
3148                 }
3149                 f2fs_info(sbi, "Using encoding defined by superblock: "
3150                          "%s-%s with flags 0x%hx", encoding_info->name,
3151                          encoding_info->version?:"\b", encoding_flags);
3152
3153                 sbi->s_encoding = encoding;
3154                 sbi->s_encoding_flags = encoding_flags;
3155                 sbi->sb->s_d_op = &f2fs_dentry_ops;
3156         }
3157 #else
3158         if (f2fs_sb_has_casefold(sbi)) {
3159                 f2fs_err(sbi, "Filesystem with casefold feature cannot be mounted without CONFIG_UNICODE");
3160                 return -EINVAL;
3161         }
3162 #endif
3163         return 0;
3164 }
3165
3166 static void f2fs_tuning_parameters(struct f2fs_sb_info *sbi)
3167 {
3168         struct f2fs_sm_info *sm_i = SM_I(sbi);
3169
3170         /* adjust parameters according to the volume size */
3171         if (sm_i->main_segments <= SMALL_VOLUME_SEGMENTS) {
3172                 F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_REUSE;
3173                 sm_i->dcc_info->discard_granularity = 1;
3174                 sm_i->ipu_policy = 1 << F2FS_IPU_FORCE;
3175         }
3176
3177         sbi->readdir_ra = 1;
3178 }
3179
3180 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
3181 {
3182         struct f2fs_sb_info *sbi;
3183         struct f2fs_super_block *raw_super;
3184         struct inode *root;
3185         int err;
3186         bool skip_recovery = false, need_fsck = false;
3187         char *options = NULL;
3188         int recovery, i, valid_super_block;
3189         struct curseg_info *seg_i;
3190         int retry_cnt = 1;
3191
3192 try_onemore:
3193         err = -EINVAL;
3194         raw_super = NULL;
3195         valid_super_block = -1;
3196         recovery = 0;
3197
3198         /* allocate memory for f2fs-specific super block info */
3199         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
3200         if (!sbi)
3201                 return -ENOMEM;
3202
3203         sbi->sb = sb;
3204
3205         /* Load the checksum driver */
3206         sbi->s_chksum_driver = crypto_alloc_shash("crc32", 0, 0);
3207         if (IS_ERR(sbi->s_chksum_driver)) {
3208                 f2fs_err(sbi, "Cannot load crc32 driver.");
3209                 err = PTR_ERR(sbi->s_chksum_driver);
3210                 sbi->s_chksum_driver = NULL;
3211                 goto free_sbi;
3212         }
3213
3214         /* set a block size */
3215         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
3216                 f2fs_err(sbi, "unable to set blocksize");
3217                 goto free_sbi;
3218         }
3219
3220         err = read_raw_super_block(sbi, &raw_super, &valid_super_block,
3221                                                                 &recovery);
3222         if (err)
3223                 goto free_sbi;
3224
3225         sb->s_fs_info = sbi;
3226         sbi->raw_super = raw_super;
3227
3228         /* precompute checksum seed for metadata */
3229         if (f2fs_sb_has_inode_chksum(sbi))
3230                 sbi->s_chksum_seed = f2fs_chksum(sbi, ~0, raw_super->uuid,
3231                                                 sizeof(raw_super->uuid));
3232
3233         /*
3234          * The BLKZONED feature indicates that the drive was formatted with
3235          * zone alignment optimization. This is optional for host-aware
3236          * devices, but mandatory for host-managed zoned block devices.
3237          */
3238 #ifndef CONFIG_BLK_DEV_ZONED
3239         if (f2fs_sb_has_blkzoned(sbi)) {
3240                 f2fs_err(sbi, "Zoned block device support is not enabled");
3241                 err = -EOPNOTSUPP;
3242                 goto free_sb_buf;
3243         }
3244 #endif
3245         default_options(sbi);
3246         /* parse mount options */
3247         options = kstrdup((const char *)data, GFP_KERNEL);
3248         if (data && !options) {
3249                 err = -ENOMEM;
3250                 goto free_sb_buf;
3251         }
3252
3253         err = parse_options(sb, options);
3254         if (err)
3255                 goto free_options;
3256
3257         sbi->max_file_blocks = max_file_blocks();
3258         sb->s_maxbytes = sbi->max_file_blocks <<
3259                                 le32_to_cpu(raw_super->log_blocksize);
3260         sb->s_max_links = F2FS_LINK_MAX;
3261
3262         err = f2fs_setup_casefold(sbi);
3263         if (err)
3264                 goto free_options;
3265
3266 #ifdef CONFIG_QUOTA
3267         sb->dq_op = &f2fs_quota_operations;
3268         sb->s_qcop = &f2fs_quotactl_ops;
3269         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
3270
3271         if (f2fs_sb_has_quota_ino(sbi)) {
3272                 for (i = 0; i < MAXQUOTAS; i++) {
3273                         if (f2fs_qf_ino(sbi->sb, i))
3274                                 sbi->nquota_files++;
3275                 }
3276         }
3277 #endif
3278
3279         sb->s_op = &f2fs_sops;
3280 #ifdef CONFIG_FS_ENCRYPTION
3281         sb->s_cop = &f2fs_cryptops;
3282 #endif
3283 #ifdef CONFIG_FS_VERITY
3284         sb->s_vop = &f2fs_verityops;
3285 #endif
3286         sb->s_xattr = f2fs_xattr_handlers;
3287         sb->s_export_op = &f2fs_export_ops;
3288         sb->s_magic = F2FS_SUPER_MAGIC;
3289         sb->s_time_gran = 1;
3290         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3291                 (test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
3292         memcpy(&sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
3293         sb->s_iflags |= SB_I_CGROUPWB;
3294
3295         /* init f2fs-specific super block info */
3296         sbi->valid_super_block = valid_super_block;
3297         mutex_init(&sbi->gc_mutex);
3298         mutex_init(&sbi->writepages);
3299         mutex_init(&sbi->cp_mutex);
3300         mutex_init(&sbi->resize_mutex);
3301         init_rwsem(&sbi->node_write);
3302         init_rwsem(&sbi->node_change);
3303
3304         /* disallow all the data/node/meta page writes */
3305         set_sbi_flag(sbi, SBI_POR_DOING);
3306         spin_lock_init(&sbi->stat_lock);
3307
3308         /* init iostat info */
3309         spin_lock_init(&sbi->iostat_lock);
3310         sbi->iostat_enable = false;
3311
3312         for (i = 0; i < NR_PAGE_TYPE; i++) {
3313                 int n = (i == META) ? 1: NR_TEMP_TYPE;
3314                 int j;
3315
3316                 sbi->write_io[i] =
3317                         f2fs_kmalloc(sbi,
3318                                      array_size(n,
3319                                                 sizeof(struct f2fs_bio_info)),
3320                                      GFP_KERNEL);
3321                 if (!sbi->write_io[i]) {
3322                         err = -ENOMEM;
3323                         goto free_bio_info;
3324                 }
3325
3326                 for (j = HOT; j < n; j++) {
3327                         init_rwsem(&sbi->write_io[i][j].io_rwsem);
3328                         sbi->write_io[i][j].sbi = sbi;
3329                         sbi->write_io[i][j].bio = NULL;
3330                         spin_lock_init(&sbi->write_io[i][j].io_lock);
3331                         INIT_LIST_HEAD(&sbi->write_io[i][j].io_list);
3332                 }
3333         }
3334
3335         init_rwsem(&sbi->cp_rwsem);
3336         init_rwsem(&sbi->quota_sem);
3337         init_waitqueue_head(&sbi->cp_wait);
3338         init_sb_info(sbi);
3339
3340         err = init_percpu_info(sbi);
3341         if (err)
3342                 goto free_bio_info;
3343
3344         if (F2FS_IO_ALIGNED(sbi)) {
3345                 sbi->write_io_dummy =
3346                         mempool_create_page_pool(2 * (F2FS_IO_SIZE(sbi) - 1), 0);
3347                 if (!sbi->write_io_dummy) {
3348                         err = -ENOMEM;
3349                         goto free_percpu;
3350                 }
3351         }
3352
3353         /* get an inode for meta space */
3354         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
3355         if (IS_ERR(sbi->meta_inode)) {
3356                 f2fs_err(sbi, "Failed to read F2FS meta data inode");
3357                 err = PTR_ERR(sbi->meta_inode);
3358                 goto free_io_dummy;
3359         }
3360
3361         err = f2fs_get_valid_checkpoint(sbi);
3362         if (err) {
3363                 f2fs_err(sbi, "Failed to get valid F2FS checkpoint");
3364                 goto free_meta_inode;
3365         }
3366
3367         if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_QUOTA_NEED_FSCK_FLAG))
3368                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
3369         if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_DISABLED_QUICK_FLAG)) {
3370                 set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
3371                 sbi->interval_time[DISABLE_TIME] = DEF_DISABLE_QUICK_INTERVAL;
3372         }
3373
3374         if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_FSCK_FLAG))
3375                 set_sbi_flag(sbi, SBI_NEED_FSCK);
3376
3377         /* Initialize device list */
3378         err = f2fs_scan_devices(sbi);
3379         if (err) {
3380                 f2fs_err(sbi, "Failed to find devices");
3381                 goto free_devices;
3382         }
3383
3384         sbi->total_valid_node_count =
3385                                 le32_to_cpu(sbi->ckpt->valid_node_count);
3386         percpu_counter_set(&sbi->total_valid_inode_count,
3387                                 le32_to_cpu(sbi->ckpt->valid_inode_count));
3388         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
3389         sbi->total_valid_block_count =
3390                                 le64_to_cpu(sbi->ckpt->valid_block_count);
3391         sbi->last_valid_block_count = sbi->total_valid_block_count;
3392         sbi->reserved_blocks = 0;
3393         sbi->current_reserved_blocks = 0;
3394         limit_reserve_root(sbi);
3395
3396         for (i = 0; i < NR_INODE_TYPE; i++) {
3397                 INIT_LIST_HEAD(&sbi->inode_list[i]);
3398                 spin_lock_init(&sbi->inode_lock[i]);
3399         }
3400         mutex_init(&sbi->flush_lock);
3401
3402         f2fs_init_extent_cache_info(sbi);
3403
3404         f2fs_init_ino_entry_info(sbi);
3405
3406         f2fs_init_fsync_node_info(sbi);
3407
3408         /* setup f2fs internal modules */
3409         err = f2fs_build_segment_manager(sbi);
3410         if (err) {
3411                 f2fs_err(sbi, "Failed to initialize F2FS segment manager (%d)",
3412                          err);
3413                 goto free_sm;
3414         }
3415         err = f2fs_build_node_manager(sbi);
3416         if (err) {
3417                 f2fs_err(sbi, "Failed to initialize F2FS node manager (%d)",
3418                          err);
3419                 goto free_nm;
3420         }
3421
3422         /* For write statistics */
3423         if (sb->s_bdev->bd_part)
3424                 sbi->sectors_written_start =
3425                         (u64)part_stat_read(sb->s_bdev->bd_part,
3426                                             sectors[STAT_WRITE]);
3427
3428         /* Read accumulated write IO statistics if exists */
3429         seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
3430         if (__exist_node_summaries(sbi))
3431                 sbi->kbytes_written =
3432                         le64_to_cpu(seg_i->journal->info.kbytes_written);
3433
3434         f2fs_build_gc_manager(sbi);
3435
3436         err = f2fs_build_stats(sbi);
3437         if (err)
3438                 goto free_nm;
3439
3440         /* get an inode for node space */
3441         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
3442         if (IS_ERR(sbi->node_inode)) {
3443                 f2fs_err(sbi, "Failed to read node inode");
3444                 err = PTR_ERR(sbi->node_inode);
3445                 goto free_stats;
3446         }
3447
3448         /* read root inode and dentry */
3449         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
3450         if (IS_ERR(root)) {
3451                 f2fs_err(sbi, "Failed to read root inode");
3452                 err = PTR_ERR(root);
3453                 goto free_node_inode;
3454         }
3455         if (!S_ISDIR(root->i_mode) || !root->i_blocks ||
3456                         !root->i_size || !root->i_nlink) {
3457                 iput(root);
3458                 err = -EINVAL;
3459                 goto free_node_inode;
3460         }
3461
3462         sb->s_root = d_make_root(root); /* allocate root dentry */
3463         if (!sb->s_root) {
3464                 err = -ENOMEM;
3465                 goto free_node_inode;
3466         }
3467
3468         err = f2fs_register_sysfs(sbi);
3469         if (err)
3470                 goto free_root_inode;
3471
3472 #ifdef CONFIG_QUOTA
3473         /* Enable quota usage during mount */
3474         if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sb)) {
3475                 err = f2fs_enable_quotas(sb);
3476                 if (err)
3477                         f2fs_err(sbi, "Cannot turn on quotas: error %d", err);
3478         }
3479 #endif
3480         /* if there are nt orphan nodes free them */
3481         err = f2fs_recover_orphan_inodes(sbi);
3482         if (err)
3483                 goto free_meta;
3484
3485         if (unlikely(is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)))
3486                 goto reset_checkpoint;
3487
3488         /* recover fsynced data */
3489         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
3490                 /*
3491                  * mount should be failed, when device has readonly mode, and
3492                  * previous checkpoint was not done by clean system shutdown.
3493                  */
3494                 if (f2fs_hw_is_readonly(sbi)) {
3495                         if (!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
3496                                 err = -EROFS;
3497                                 f2fs_err(sbi, "Need to recover fsync data, but write access unavailable");
3498                                 goto free_meta;
3499                         }
3500                         f2fs_info(sbi, "write access unavailable, skipping recovery");
3501                         goto reset_checkpoint;
3502                 }
3503
3504                 if (need_fsck)
3505                         set_sbi_flag(sbi, SBI_NEED_FSCK);
3506
3507                 if (skip_recovery)
3508                         goto reset_checkpoint;
3509
3510                 err = f2fs_recover_fsync_data(sbi, false);
3511                 if (err < 0) {
3512                         if (err != -ENOMEM)
3513                                 skip_recovery = true;
3514                         need_fsck = true;
3515                         f2fs_err(sbi, "Cannot recover all fsync data errno=%d",
3516                                  err);
3517                         goto free_meta;
3518                 }
3519         } else {
3520                 err = f2fs_recover_fsync_data(sbi, true);
3521
3522                 if (!f2fs_readonly(sb) && err > 0) {
3523                         err = -EINVAL;
3524                         f2fs_err(sbi, "Need to recover fsync data");
3525                         goto free_meta;
3526                 }
3527         }
3528 reset_checkpoint:
3529         /* f2fs_recover_fsync_data() cleared this already */
3530         clear_sbi_flag(sbi, SBI_POR_DOING);
3531
3532         if (test_opt(sbi, DISABLE_CHECKPOINT)) {
3533                 err = f2fs_disable_checkpoint(sbi);
3534                 if (err)
3535                         goto sync_free_meta;
3536         } else if (is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)) {
3537                 f2fs_enable_checkpoint(sbi);
3538         }
3539
3540         /*
3541          * If filesystem is not mounted as read-only then
3542          * do start the gc_thread.
3543          */
3544         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
3545                 /* After POR, we can run background GC thread.*/
3546                 err = f2fs_start_gc_thread(sbi);
3547                 if (err)
3548                         goto sync_free_meta;
3549         }
3550         kvfree(options);
3551
3552         /* recover broken superblock */
3553         if (recovery) {
3554                 err = f2fs_commit_super(sbi, true);
3555                 f2fs_info(sbi, "Try to recover %dth superblock, ret: %d",
3556                           sbi->valid_super_block ? 1 : 2, err);
3557         }
3558
3559         f2fs_join_shrinker(sbi);
3560
3561         f2fs_tuning_parameters(sbi);
3562
3563         f2fs_notice(sbi, "Mounted with checkpoint version = %llx",
3564                     cur_cp_version(F2FS_CKPT(sbi)));
3565         f2fs_update_time(sbi, CP_TIME);
3566         f2fs_update_time(sbi, REQ_TIME);
3567         clear_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
3568         return 0;
3569
3570 sync_free_meta:
3571         /* safe to flush all the data */
3572         sync_filesystem(sbi->sb);
3573         retry_cnt = 0;
3574
3575 free_meta:
3576 #ifdef CONFIG_QUOTA
3577         f2fs_truncate_quota_inode_pages(sb);
3578         if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sb))
3579                 f2fs_quota_off_umount(sbi->sb);
3580 #endif
3581         /*
3582          * Some dirty meta pages can be produced by f2fs_recover_orphan_inodes()
3583          * failed by EIO. Then, iput(node_inode) can trigger balance_fs_bg()
3584          * followed by f2fs_write_checkpoint() through f2fs_write_node_pages(), which
3585          * falls into an infinite loop in f2fs_sync_meta_pages().
3586          */
3587         truncate_inode_pages_final(META_MAPPING(sbi));
3588         /* evict some inodes being cached by GC */
3589         evict_inodes(sb);
3590         f2fs_unregister_sysfs(sbi);
3591 free_root_inode:
3592         dput(sb->s_root);
3593         sb->s_root = NULL;
3594 free_node_inode:
3595         f2fs_release_ino_entry(sbi, true);
3596         truncate_inode_pages_final(NODE_MAPPING(sbi));
3597         iput(sbi->node_inode);
3598         sbi->node_inode = NULL;
3599 free_stats:
3600         f2fs_destroy_stats(sbi);
3601 free_nm:
3602         f2fs_destroy_node_manager(sbi);
3603 free_sm:
3604         f2fs_destroy_segment_manager(sbi);
3605 free_devices:
3606         destroy_device_list(sbi);
3607         kvfree(sbi->ckpt);
3608 free_meta_inode:
3609         make_bad_inode(sbi->meta_inode);
3610         iput(sbi->meta_inode);
3611         sbi->meta_inode = NULL;
3612 free_io_dummy:
3613         mempool_destroy(sbi->write_io_dummy);
3614 free_percpu:
3615         destroy_percpu_info(sbi);
3616 free_bio_info:
3617         for (i = 0; i < NR_PAGE_TYPE; i++)
3618                 kvfree(sbi->write_io[i]);
3619
3620 #ifdef CONFIG_UNICODE
3621         utf8_unload(sbi->s_encoding);
3622 #endif
3623 free_options:
3624 #ifdef CONFIG_QUOTA
3625         for (i = 0; i < MAXQUOTAS; i++)
3626                 kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
3627 #endif
3628         kvfree(options);
3629 free_sb_buf:
3630         kvfree(raw_super);
3631 free_sbi:
3632         if (sbi->s_chksum_driver)
3633                 crypto_free_shash(sbi->s_chksum_driver);
3634         kvfree(sbi);
3635
3636         /* give only one another chance */
3637         if (retry_cnt > 0 && skip_recovery) {
3638                 retry_cnt--;
3639                 shrink_dcache_sb(sb);
3640                 goto try_onemore;
3641         }
3642         return err;
3643 }
3644
3645 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
3646                         const char *dev_name, void *data)
3647 {
3648         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
3649 }
3650
3651 static void kill_f2fs_super(struct super_block *sb)
3652 {
3653         if (sb->s_root) {
3654                 struct f2fs_sb_info *sbi = F2FS_SB(sb);
3655
3656                 set_sbi_flag(sbi, SBI_IS_CLOSE);
3657                 f2fs_stop_gc_thread(sbi);
3658                 f2fs_stop_discard_thread(sbi);
3659
3660                 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
3661                                 !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
3662                         struct cp_control cpc = {
3663                                 .reason = CP_UMOUNT,
3664                         };
3665                         f2fs_write_checkpoint(sbi, &cpc);
3666                 }
3667
3668                 if (is_sbi_flag_set(sbi, SBI_IS_RECOVERED) && f2fs_readonly(sb))
3669                         sb->s_flags &= ~SB_RDONLY;
3670         }
3671         kill_block_super(sb);
3672 }
3673
3674 static struct file_system_type f2fs_fs_type = {
3675         .owner          = THIS_MODULE,
3676         .name           = "f2fs",
3677         .mount          = f2fs_mount,
3678         .kill_sb        = kill_f2fs_super,
3679         .fs_flags       = FS_REQUIRES_DEV,
3680 };
3681 MODULE_ALIAS_FS("f2fs");
3682
3683 static int __init init_inodecache(void)
3684 {
3685         f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache",
3686                         sizeof(struct f2fs_inode_info), 0,
3687                         SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL);
3688         if (!f2fs_inode_cachep)
3689                 return -ENOMEM;
3690         return 0;
3691 }
3692
3693 static void destroy_inodecache(void)
3694 {
3695         /*
3696          * Make sure all delayed rcu free inodes are flushed before we
3697          * destroy cache.
3698          */
3699         rcu_barrier();
3700         kmem_cache_destroy(f2fs_inode_cachep);
3701 }
3702
3703 static int __init init_f2fs_fs(void)
3704 {
3705         int err;
3706
3707         if (PAGE_SIZE != F2FS_BLKSIZE) {
3708                 printk("F2FS not supported on PAGE_SIZE(%lu) != %d\n",
3709                                 PAGE_SIZE, F2FS_BLKSIZE);
3710                 return -EINVAL;
3711         }
3712
3713         f2fs_build_trace_ios();
3714
3715         err = init_inodecache();
3716         if (err)
3717                 goto fail;
3718         err = f2fs_create_node_manager_caches();
3719         if (err)
3720                 goto free_inodecache;
3721         err = f2fs_create_segment_manager_caches();
3722         if (err)
3723                 goto free_node_manager_caches;
3724         err = f2fs_create_checkpoint_caches();
3725         if (err)
3726                 goto free_segment_manager_caches;
3727         err = f2fs_create_extent_cache();
3728         if (err)
3729                 goto free_checkpoint_caches;
3730         err = f2fs_init_sysfs();
3731         if (err)
3732                 goto free_extent_cache;
3733         err = register_shrinker(&f2fs_shrinker_info);
3734         if (err)
3735                 goto free_sysfs;
3736         err = register_filesystem(&f2fs_fs_type);
3737         if (err)
3738                 goto free_shrinker;
3739         f2fs_create_root_stats();
3740         err = f2fs_init_post_read_processing();
3741         if (err)
3742                 goto free_root_stats;
3743         return 0;
3744
3745 free_root_stats:
3746         f2fs_destroy_root_stats();
3747         unregister_filesystem(&f2fs_fs_type);
3748 free_shrinker:
3749         unregister_shrinker(&f2fs_shrinker_info);
3750 free_sysfs:
3751         f2fs_exit_sysfs();
3752 free_extent_cache:
3753         f2fs_destroy_extent_cache();
3754 free_checkpoint_caches:
3755         f2fs_destroy_checkpoint_caches();
3756 free_segment_manager_caches:
3757         f2fs_destroy_segment_manager_caches();
3758 free_node_manager_caches:
3759         f2fs_destroy_node_manager_caches();
3760 free_inodecache:
3761         destroy_inodecache();
3762 fail:
3763         return err;
3764 }
3765
3766 static void __exit exit_f2fs_fs(void)
3767 {
3768         f2fs_destroy_post_read_processing();
3769         f2fs_destroy_root_stats();
3770         unregister_filesystem(&f2fs_fs_type);
3771         unregister_shrinker(&f2fs_shrinker_info);
3772         f2fs_exit_sysfs();
3773         f2fs_destroy_extent_cache();
3774         f2fs_destroy_checkpoint_caches();
3775         f2fs_destroy_segment_manager_caches();
3776         f2fs_destroy_node_manager_caches();
3777         destroy_inodecache();
3778         f2fs_destroy_trace_ios();
3779 }
3780
3781 module_init(init_f2fs_fs)
3782 module_exit(exit_f2fs_fs)
3783
3784 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
3785 MODULE_DESCRIPTION("Flash Friendly File System");
3786 MODULE_LICENSE("GPL");
3787