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 = 0;
1217         if (dquot->dq_dqb.dqb_bsoftlimit)
1218                 limit = dquot->dq_dqb.dqb_bsoftlimit;
1219         if (dquot->dq_dqb.dqb_bhardlimit &&
1220                         (!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
1221                 limit = dquot->dq_dqb.dqb_bhardlimit;
1222
1223         if (limit && buf->f_blocks > limit) {
1224                 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
1225                 buf->f_blocks = limit;
1226                 buf->f_bfree = buf->f_bavail =
1227                         (buf->f_blocks > curblock) ?
1228                          (buf->f_blocks - curblock) : 0;
1229         }
1230
1231         limit = 0;
1232         if (dquot->dq_dqb.dqb_isoftlimit)
1233                 limit = dquot->dq_dqb.dqb_isoftlimit;
1234         if (dquot->dq_dqb.dqb_ihardlimit &&
1235                         (!limit || dquot->dq_dqb.dqb_ihardlimit < limit))
1236                 limit = dquot->dq_dqb.dqb_ihardlimit;
1237
1238         if (limit && buf->f_files > limit) {
1239                 buf->f_files = limit;
1240                 buf->f_ffree =
1241                         (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
1242                          (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
1243         }
1244
1245         spin_unlock(&dquot->dq_dqb_lock);
1246         dqput(dquot);
1247         return 0;
1248 }
1249 #endif
1250
1251 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
1252 {
1253         struct super_block *sb = dentry->d_sb;
1254         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1255         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1256         block_t total_count, user_block_count, start_count;
1257         u64 avail_node_count;
1258
1259         total_count = le64_to_cpu(sbi->raw_super->block_count);
1260         user_block_count = sbi->user_block_count;
1261         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
1262         buf->f_type = F2FS_SUPER_MAGIC;
1263         buf->f_bsize = sbi->blocksize;
1264
1265         buf->f_blocks = total_count - start_count;
1266         buf->f_bfree = user_block_count - valid_user_blocks(sbi) -
1267                                                 sbi->current_reserved_blocks;
1268
1269         spin_lock(&sbi->stat_lock);
1270         if (unlikely(buf->f_bfree <= sbi->unusable_block_count))
1271                 buf->f_bfree = 0;
1272         else
1273                 buf->f_bfree -= sbi->unusable_block_count;
1274         spin_unlock(&sbi->stat_lock);
1275
1276         if (buf->f_bfree > F2FS_OPTION(sbi).root_reserved_blocks)
1277                 buf->f_bavail = buf->f_bfree -
1278                                 F2FS_OPTION(sbi).root_reserved_blocks;
1279         else
1280                 buf->f_bavail = 0;
1281
1282         avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
1283
1284         if (avail_node_count > user_block_count) {
1285                 buf->f_files = user_block_count;
1286                 buf->f_ffree = buf->f_bavail;
1287         } else {
1288                 buf->f_files = avail_node_count;
1289                 buf->f_ffree = min(avail_node_count - valid_node_count(sbi),
1290                                         buf->f_bavail);
1291         }
1292
1293         buf->f_namelen = F2FS_NAME_LEN;
1294         buf->f_fsid.val[0] = (u32)id;
1295         buf->f_fsid.val[1] = (u32)(id >> 32);
1296
1297 #ifdef CONFIG_QUOTA
1298         if (is_inode_flag_set(dentry->d_inode, FI_PROJ_INHERIT) &&
1299                         sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
1300                 f2fs_statfs_project(sb, F2FS_I(dentry->d_inode)->i_projid, buf);
1301         }
1302 #endif
1303         return 0;
1304 }
1305
1306 static inline void f2fs_show_quota_options(struct seq_file *seq,
1307                                            struct super_block *sb)
1308 {
1309 #ifdef CONFIG_QUOTA
1310         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1311
1312         if (F2FS_OPTION(sbi).s_jquota_fmt) {
1313                 char *fmtname = "";
1314
1315                 switch (F2FS_OPTION(sbi).s_jquota_fmt) {
1316                 case QFMT_VFS_OLD:
1317                         fmtname = "vfsold";
1318                         break;
1319                 case QFMT_VFS_V0:
1320                         fmtname = "vfsv0";
1321                         break;
1322                 case QFMT_VFS_V1:
1323                         fmtname = "vfsv1";
1324                         break;
1325                 }
1326                 seq_printf(seq, ",jqfmt=%s", fmtname);
1327         }
1328
1329         if (F2FS_OPTION(sbi).s_qf_names[USRQUOTA])
1330                 seq_show_option(seq, "usrjquota",
1331                         F2FS_OPTION(sbi).s_qf_names[USRQUOTA]);
1332
1333         if (F2FS_OPTION(sbi).s_qf_names[GRPQUOTA])
1334                 seq_show_option(seq, "grpjquota",
1335                         F2FS_OPTION(sbi).s_qf_names[GRPQUOTA]);
1336
1337         if (F2FS_OPTION(sbi).s_qf_names[PRJQUOTA])
1338                 seq_show_option(seq, "prjjquota",
1339                         F2FS_OPTION(sbi).s_qf_names[PRJQUOTA]);
1340 #endif
1341 }
1342
1343 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
1344 {
1345         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
1346
1347         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
1348                 if (test_opt(sbi, FORCE_FG_GC))
1349                         seq_printf(seq, ",background_gc=%s", "sync");
1350                 else
1351                         seq_printf(seq, ",background_gc=%s", "on");
1352         } else {
1353                 seq_printf(seq, ",background_gc=%s", "off");
1354         }
1355         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
1356                 seq_puts(seq, ",disable_roll_forward");
1357         if (test_opt(sbi, DISCARD))
1358                 seq_puts(seq, ",discard");
1359         else
1360                 seq_puts(seq, ",nodiscard");
1361         if (test_opt(sbi, NOHEAP))
1362                 seq_puts(seq, ",no_heap");
1363         else
1364                 seq_puts(seq, ",heap");
1365 #ifdef CONFIG_F2FS_FS_XATTR
1366         if (test_opt(sbi, XATTR_USER))
1367                 seq_puts(seq, ",user_xattr");
1368         else
1369                 seq_puts(seq, ",nouser_xattr");
1370         if (test_opt(sbi, INLINE_XATTR))
1371                 seq_puts(seq, ",inline_xattr");
1372         else
1373                 seq_puts(seq, ",noinline_xattr");
1374         if (test_opt(sbi, INLINE_XATTR_SIZE))
1375                 seq_printf(seq, ",inline_xattr_size=%u",
1376                                         F2FS_OPTION(sbi).inline_xattr_size);
1377 #endif
1378 #ifdef CONFIG_F2FS_FS_POSIX_ACL
1379         if (test_opt(sbi, POSIX_ACL))
1380                 seq_puts(seq, ",acl");
1381         else
1382                 seq_puts(seq, ",noacl");
1383 #endif
1384         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
1385                 seq_puts(seq, ",disable_ext_identify");
1386         if (test_opt(sbi, INLINE_DATA))
1387                 seq_puts(seq, ",inline_data");
1388         else
1389                 seq_puts(seq, ",noinline_data");
1390         if (test_opt(sbi, INLINE_DENTRY))
1391                 seq_puts(seq, ",inline_dentry");
1392         else
1393                 seq_puts(seq, ",noinline_dentry");
1394         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
1395                 seq_puts(seq, ",flush_merge");
1396         if (test_opt(sbi, NOBARRIER))
1397                 seq_puts(seq, ",nobarrier");
1398         if (test_opt(sbi, FASTBOOT))
1399                 seq_puts(seq, ",fastboot");
1400         if (test_opt(sbi, EXTENT_CACHE))
1401                 seq_puts(seq, ",extent_cache");
1402         else
1403                 seq_puts(seq, ",noextent_cache");
1404         if (test_opt(sbi, DATA_FLUSH))
1405                 seq_puts(seq, ",data_flush");
1406
1407         seq_puts(seq, ",mode=");
1408         if (test_opt(sbi, ADAPTIVE))
1409                 seq_puts(seq, "adaptive");
1410         else if (test_opt(sbi, LFS))
1411                 seq_puts(seq, "lfs");
1412         seq_printf(seq, ",active_logs=%u", F2FS_OPTION(sbi).active_logs);
1413         if (test_opt(sbi, RESERVE_ROOT))
1414                 seq_printf(seq, ",reserve_root=%u,resuid=%u,resgid=%u",
1415                                 F2FS_OPTION(sbi).root_reserved_blocks,
1416                                 from_kuid_munged(&init_user_ns,
1417                                         F2FS_OPTION(sbi).s_resuid),
1418                                 from_kgid_munged(&init_user_ns,
1419                                         F2FS_OPTION(sbi).s_resgid));
1420         if (F2FS_IO_SIZE_BITS(sbi))
1421                 seq_printf(seq, ",io_bits=%u",
1422                                 F2FS_OPTION(sbi).write_io_size_bits);
1423 #ifdef CONFIG_F2FS_FAULT_INJECTION
1424         if (test_opt(sbi, FAULT_INJECTION)) {
1425                 seq_printf(seq, ",fault_injection=%u",
1426                                 F2FS_OPTION(sbi).fault_info.inject_rate);
1427                 seq_printf(seq, ",fault_type=%u",
1428                                 F2FS_OPTION(sbi).fault_info.inject_type);
1429         }
1430 #endif
1431 #ifdef CONFIG_QUOTA
1432         if (test_opt(sbi, QUOTA))
1433                 seq_puts(seq, ",quota");
1434         if (test_opt(sbi, USRQUOTA))
1435                 seq_puts(seq, ",usrquota");
1436         if (test_opt(sbi, GRPQUOTA))
1437                 seq_puts(seq, ",grpquota");
1438         if (test_opt(sbi, PRJQUOTA))
1439                 seq_puts(seq, ",prjquota");
1440 #endif
1441         f2fs_show_quota_options(seq, sbi->sb);
1442         if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_USER)
1443                 seq_printf(seq, ",whint_mode=%s", "user-based");
1444         else if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_FS)
1445                 seq_printf(seq, ",whint_mode=%s", "fs-based");
1446 #ifdef CONFIG_FS_ENCRYPTION
1447         if (F2FS_OPTION(sbi).test_dummy_encryption)
1448                 seq_puts(seq, ",test_dummy_encryption");
1449 #endif
1450
1451         if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_DEFAULT)
1452                 seq_printf(seq, ",alloc_mode=%s", "default");
1453         else if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_REUSE)
1454                 seq_printf(seq, ",alloc_mode=%s", "reuse");
1455
1456         if (test_opt(sbi, DISABLE_CHECKPOINT))
1457                 seq_printf(seq, ",checkpoint=disable:%u",
1458                                 F2FS_OPTION(sbi).unusable_cap);
1459         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_POSIX)
1460                 seq_printf(seq, ",fsync_mode=%s", "posix");
1461         else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
1462                 seq_printf(seq, ",fsync_mode=%s", "strict");
1463         else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_NOBARRIER)
1464                 seq_printf(seq, ",fsync_mode=%s", "nobarrier");
1465         return 0;
1466 }
1467
1468 static void default_options(struct f2fs_sb_info *sbi)
1469 {
1470         /* init some FS parameters */
1471         F2FS_OPTION(sbi).active_logs = NR_CURSEG_TYPE;
1472         F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
1473         F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
1474         F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
1475         F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
1476         F2FS_OPTION(sbi).test_dummy_encryption = false;
1477         F2FS_OPTION(sbi).s_resuid = make_kuid(&init_user_ns, F2FS_DEF_RESUID);
1478         F2FS_OPTION(sbi).s_resgid = make_kgid(&init_user_ns, F2FS_DEF_RESGID);
1479
1480         set_opt(sbi, BG_GC);
1481         set_opt(sbi, INLINE_XATTR);
1482         set_opt(sbi, INLINE_DATA);
1483         set_opt(sbi, INLINE_DENTRY);
1484         set_opt(sbi, EXTENT_CACHE);
1485         set_opt(sbi, NOHEAP);
1486         clear_opt(sbi, DISABLE_CHECKPOINT);
1487         F2FS_OPTION(sbi).unusable_cap = 0;
1488         sbi->sb->s_flags |= SB_LAZYTIME;
1489         set_opt(sbi, FLUSH_MERGE);
1490         set_opt(sbi, DISCARD);
1491         if (f2fs_sb_has_blkzoned(sbi))
1492                 set_opt_mode(sbi, F2FS_MOUNT_LFS);
1493         else
1494                 set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
1495
1496 #ifdef CONFIG_F2FS_FS_XATTR
1497         set_opt(sbi, XATTR_USER);
1498 #endif
1499 #ifdef CONFIG_F2FS_FS_POSIX_ACL
1500         set_opt(sbi, POSIX_ACL);
1501 #endif
1502
1503         f2fs_build_fault_attr(sbi, 0, 0);
1504 }
1505
1506 #ifdef CONFIG_QUOTA
1507 static int f2fs_enable_quotas(struct super_block *sb);
1508 #endif
1509
1510 static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
1511 {
1512         unsigned int s_flags = sbi->sb->s_flags;
1513         struct cp_control cpc;
1514         int err = 0;
1515         int ret;
1516         block_t unusable;
1517
1518         if (s_flags & SB_RDONLY) {
1519                 f2fs_err(sbi, "checkpoint=disable on readonly fs");
1520                 return -EINVAL;
1521         }
1522         sbi->sb->s_flags |= SB_ACTIVE;
1523
1524         f2fs_update_time(sbi, DISABLE_TIME);
1525
1526         while (!f2fs_time_over(sbi, DISABLE_TIME)) {
1527                 mutex_lock(&sbi->gc_mutex);
1528                 err = f2fs_gc(sbi, true, false, NULL_SEGNO);
1529                 if (err == -ENODATA) {
1530                         err = 0;
1531                         break;
1532                 }
1533                 if (err && err != -EAGAIN)
1534                         break;
1535         }
1536
1537         ret = sync_filesystem(sbi->sb);
1538         if (ret || err) {
1539                 err = ret ? ret: err;
1540                 goto restore_flag;
1541         }
1542
1543         unusable = f2fs_get_unusable_blocks(sbi);
1544         if (f2fs_disable_cp_again(sbi, unusable)) {
1545                 err = -EAGAIN;
1546                 goto restore_flag;
1547         }
1548
1549         mutex_lock(&sbi->gc_mutex);
1550         cpc.reason = CP_PAUSE;
1551         set_sbi_flag(sbi, SBI_CP_DISABLED);
1552         err = f2fs_write_checkpoint(sbi, &cpc);
1553         if (err)
1554                 goto out_unlock;
1555
1556         spin_lock(&sbi->stat_lock);
1557         sbi->unusable_block_count = unusable;
1558         spin_unlock(&sbi->stat_lock);
1559
1560 out_unlock:
1561         mutex_unlock(&sbi->gc_mutex);
1562 restore_flag:
1563         sbi->sb->s_flags = s_flags;     /* Restore MS_RDONLY status */
1564         return err;
1565 }
1566
1567 static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
1568 {
1569         mutex_lock(&sbi->gc_mutex);
1570         f2fs_dirty_to_prefree(sbi);
1571
1572         clear_sbi_flag(sbi, SBI_CP_DISABLED);
1573         set_sbi_flag(sbi, SBI_IS_DIRTY);
1574         mutex_unlock(&sbi->gc_mutex);
1575
1576         f2fs_sync_fs(sbi->sb, 1);
1577 }
1578
1579 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
1580 {
1581         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1582         struct f2fs_mount_info org_mount_opt;
1583         unsigned long old_sb_flags;
1584         int err;
1585         bool need_restart_gc = false;
1586         bool need_stop_gc = false;
1587         bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
1588         bool disable_checkpoint = test_opt(sbi, DISABLE_CHECKPOINT);
1589         bool no_io_align = !F2FS_IO_ALIGNED(sbi);
1590         bool checkpoint_changed;
1591 #ifdef CONFIG_QUOTA
1592         int i, j;
1593 #endif
1594
1595         /*
1596          * Save the old mount options in case we
1597          * need to restore them.
1598          */
1599         org_mount_opt = sbi->mount_opt;
1600         old_sb_flags = sb->s_flags;
1601
1602 #ifdef CONFIG_QUOTA
1603         org_mount_opt.s_jquota_fmt = F2FS_OPTION(sbi).s_jquota_fmt;
1604         for (i = 0; i < MAXQUOTAS; i++) {
1605                 if (F2FS_OPTION(sbi).s_qf_names[i]) {
1606                         org_mount_opt.s_qf_names[i] =
1607                                 kstrdup(F2FS_OPTION(sbi).s_qf_names[i],
1608                                 GFP_KERNEL);
1609                         if (!org_mount_opt.s_qf_names[i]) {
1610                                 for (j = 0; j < i; j++)
1611                                         kvfree(org_mount_opt.s_qf_names[j]);
1612                                 return -ENOMEM;
1613                         }
1614                 } else {
1615                         org_mount_opt.s_qf_names[i] = NULL;
1616                 }
1617         }
1618 #endif
1619
1620         /* recover superblocks we couldn't write due to previous RO mount */
1621         if (!(*flags & SB_RDONLY) && is_sbi_flag_set(sbi, SBI_NEED_SB_WRITE)) {
1622                 err = f2fs_commit_super(sbi, false);
1623                 f2fs_info(sbi, "Try to recover all the superblocks, ret: %d",
1624                           err);
1625                 if (!err)
1626                         clear_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1627         }
1628
1629         default_options(sbi);
1630
1631         /* parse mount options */
1632         err = parse_options(sb, data);
1633         if (err)
1634                 goto restore_opts;
1635         checkpoint_changed =
1636                         disable_checkpoint != test_opt(sbi, DISABLE_CHECKPOINT);
1637
1638         /*
1639          * Previous and new state of filesystem is RO,
1640          * so skip checking GC and FLUSH_MERGE conditions.
1641          */
1642         if (f2fs_readonly(sb) && (*flags & SB_RDONLY))
1643                 goto skip;
1644
1645 #ifdef CONFIG_QUOTA
1646         if (!f2fs_readonly(sb) && (*flags & SB_RDONLY)) {
1647                 err = dquot_suspend(sb, -1);
1648                 if (err < 0)
1649                         goto restore_opts;
1650         } else if (f2fs_readonly(sb) && !(*flags & SB_RDONLY)) {
1651                 /* dquot_resume needs RW */
1652                 sb->s_flags &= ~SB_RDONLY;
1653                 if (sb_any_quota_suspended(sb)) {
1654                         dquot_resume(sb, -1);
1655                 } else if (f2fs_sb_has_quota_ino(sbi)) {
1656                         err = f2fs_enable_quotas(sb);
1657                         if (err)
1658                                 goto restore_opts;
1659                 }
1660         }
1661 #endif
1662         /* disallow enable/disable extent_cache dynamically */
1663         if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
1664                 err = -EINVAL;
1665                 f2fs_warn(sbi, "switch extent_cache option is not allowed");
1666                 goto restore_opts;
1667         }
1668
1669         if (no_io_align == !!F2FS_IO_ALIGNED(sbi)) {
1670                 err = -EINVAL;
1671                 f2fs_warn(sbi, "switch io_bits option is not allowed");
1672                 goto restore_opts;
1673         }
1674
1675         if ((*flags & SB_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
1676                 err = -EINVAL;
1677                 f2fs_warn(sbi, "disabling checkpoint not compatible with read-only");
1678                 goto restore_opts;
1679         }
1680
1681         /*
1682          * We stop the GC thread if FS is mounted as RO
1683          * or if background_gc = off is passed in mount
1684          * option. Also sync the filesystem.
1685          */
1686         if ((*flags & SB_RDONLY) || !test_opt(sbi, BG_GC)) {
1687                 if (sbi->gc_thread) {
1688                         f2fs_stop_gc_thread(sbi);
1689                         need_restart_gc = true;
1690                 }
1691         } else if (!sbi->gc_thread) {
1692                 err = f2fs_start_gc_thread(sbi);
1693                 if (err)
1694                         goto restore_opts;
1695                 need_stop_gc = true;
1696         }
1697
1698         if (*flags & SB_RDONLY ||
1699                 F2FS_OPTION(sbi).whint_mode != org_mount_opt.whint_mode) {
1700                 writeback_inodes_sb(sb, WB_REASON_SYNC);
1701                 sync_inodes_sb(sb);
1702
1703                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1704                 set_sbi_flag(sbi, SBI_IS_CLOSE);
1705                 f2fs_sync_fs(sb, 1);
1706                 clear_sbi_flag(sbi, SBI_IS_CLOSE);
1707         }
1708
1709         if (checkpoint_changed) {
1710                 if (test_opt(sbi, DISABLE_CHECKPOINT)) {
1711                         err = f2fs_disable_checkpoint(sbi);
1712                         if (err)
1713                                 goto restore_gc;
1714                 } else {
1715                         f2fs_enable_checkpoint(sbi);
1716                 }
1717         }
1718
1719         /*
1720          * We stop issue flush thread if FS is mounted as RO
1721          * or if flush_merge is not passed in mount option.
1722          */
1723         if ((*flags & SB_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
1724                 clear_opt(sbi, FLUSH_MERGE);
1725                 f2fs_destroy_flush_cmd_control(sbi, false);
1726         } else {
1727                 err = f2fs_create_flush_cmd_control(sbi);
1728                 if (err)
1729                         goto restore_gc;
1730         }
1731 skip:
1732 #ifdef CONFIG_QUOTA
1733         /* Release old quota file names */
1734         for (i = 0; i < MAXQUOTAS; i++)
1735                 kvfree(org_mount_opt.s_qf_names[i]);
1736 #endif
1737         /* Update the POSIXACL Flag */
1738         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1739                 (test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
1740
1741         limit_reserve_root(sbi);
1742         *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
1743         return 0;
1744 restore_gc:
1745         if (need_restart_gc) {
1746                 if (f2fs_start_gc_thread(sbi))
1747                         f2fs_warn(sbi, "background gc thread has stopped");
1748         } else if (need_stop_gc) {
1749                 f2fs_stop_gc_thread(sbi);
1750         }
1751 restore_opts:
1752 #ifdef CONFIG_QUOTA
1753         F2FS_OPTION(sbi).s_jquota_fmt = org_mount_opt.s_jquota_fmt;
1754         for (i = 0; i < MAXQUOTAS; i++) {
1755                 kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
1756                 F2FS_OPTION(sbi).s_qf_names[i] = org_mount_opt.s_qf_names[i];
1757         }
1758 #endif
1759         sbi->mount_opt = org_mount_opt;
1760         sb->s_flags = old_sb_flags;
1761         return err;
1762 }
1763
1764 #ifdef CONFIG_QUOTA
1765 /* Read data from quotafile */
1766 static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
1767                                size_t len, loff_t off)
1768 {
1769         struct inode *inode = sb_dqopt(sb)->files[type];
1770         struct address_space *mapping = inode->i_mapping;
1771         block_t blkidx = F2FS_BYTES_TO_BLK(off);
1772         int offset = off & (sb->s_blocksize - 1);
1773         int tocopy;
1774         size_t toread;
1775         loff_t i_size = i_size_read(inode);
1776         struct page *page;
1777         char *kaddr;
1778
1779         if (off > i_size)
1780                 return 0;
1781
1782         if (off + len > i_size)
1783                 len = i_size - off;
1784         toread = len;
1785         while (toread > 0) {
1786                 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
1787 repeat:
1788                 page = read_cache_page_gfp(mapping, blkidx, GFP_NOFS);
1789                 if (IS_ERR(page)) {
1790                         if (PTR_ERR(page) == -ENOMEM) {
1791                                 congestion_wait(BLK_RW_ASYNC, HZ/50);
1792                                 goto repeat;
1793                         }
1794                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
1795                         return PTR_ERR(page);
1796                 }
1797
1798                 lock_page(page);
1799
1800                 if (unlikely(page->mapping != mapping)) {
1801                         f2fs_put_page(page, 1);
1802                         goto repeat;
1803                 }
1804                 if (unlikely(!PageUptodate(page))) {
1805                         f2fs_put_page(page, 1);
1806                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
1807                         return -EIO;
1808                 }
1809
1810                 kaddr = kmap_atomic(page);
1811                 memcpy(data, kaddr + offset, tocopy);
1812                 kunmap_atomic(kaddr);
1813                 f2fs_put_page(page, 1);
1814
1815                 offset = 0;
1816                 toread -= tocopy;
1817                 data += tocopy;
1818                 blkidx++;
1819         }
1820         return len;
1821 }
1822
1823 /* Write to quotafile */
1824 static ssize_t f2fs_quota_write(struct super_block *sb, int type,
1825                                 const char *data, size_t len, loff_t off)
1826 {
1827         struct inode *inode = sb_dqopt(sb)->files[type];
1828         struct address_space *mapping = inode->i_mapping;
1829         const struct address_space_operations *a_ops = mapping->a_ops;
1830         int offset = off & (sb->s_blocksize - 1);
1831         size_t towrite = len;
1832         struct page *page;
1833         char *kaddr;
1834         int err = 0;
1835         int tocopy;
1836
1837         while (towrite > 0) {
1838                 tocopy = min_t(unsigned long, sb->s_blocksize - offset,
1839                                                                 towrite);
1840 retry:
1841                 err = a_ops->write_begin(NULL, mapping, off, tocopy, 0,
1842                                                         &page, NULL);
1843                 if (unlikely(err)) {
1844                         if (err == -ENOMEM) {
1845                                 congestion_wait(BLK_RW_ASYNC, HZ/50);
1846                                 goto retry;
1847                         }
1848                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
1849                         break;
1850                 }
1851
1852                 kaddr = kmap_atomic(page);
1853                 memcpy(kaddr + offset, data, tocopy);
1854                 kunmap_atomic(kaddr);
1855                 flush_dcache_page(page);
1856
1857                 a_ops->write_end(NULL, mapping, off, tocopy, tocopy,
1858                                                 page, NULL);
1859                 offset = 0;
1860                 towrite -= tocopy;
1861                 off += tocopy;
1862                 data += tocopy;
1863                 cond_resched();
1864         }
1865
1866         if (len == towrite)
1867                 return err;
1868         inode->i_mtime = inode->i_ctime = current_time(inode);
1869         f2fs_mark_inode_dirty_sync(inode, false);
1870         return len - towrite;
1871 }
1872
1873 static struct dquot **f2fs_get_dquots(struct inode *inode)
1874 {
1875         return F2FS_I(inode)->i_dquot;
1876 }
1877
1878 static qsize_t *f2fs_get_reserved_space(struct inode *inode)
1879 {
1880         return &F2FS_I(inode)->i_reserved_quota;
1881 }
1882
1883 static int f2fs_quota_on_mount(struct f2fs_sb_info *sbi, int type)
1884 {
1885         if (is_set_ckpt_flags(sbi, CP_QUOTA_NEED_FSCK_FLAG)) {
1886                 f2fs_err(sbi, "quota sysfile may be corrupted, skip loading it");
1887                 return 0;
1888         }
1889
1890         return dquot_quota_on_mount(sbi->sb, F2FS_OPTION(sbi).s_qf_names[type],
1891                                         F2FS_OPTION(sbi).s_jquota_fmt, type);
1892 }
1893
1894 int f2fs_enable_quota_files(struct f2fs_sb_info *sbi, bool rdonly)
1895 {
1896         int enabled = 0;
1897         int i, err;
1898
1899         if (f2fs_sb_has_quota_ino(sbi) && rdonly) {
1900                 err = f2fs_enable_quotas(sbi->sb);
1901                 if (err) {
1902                         f2fs_err(sbi, "Cannot turn on quota_ino: %d", err);
1903                         return 0;
1904                 }
1905                 return 1;
1906         }
1907
1908         for (i = 0; i < MAXQUOTAS; i++) {
1909                 if (F2FS_OPTION(sbi).s_qf_names[i]) {
1910                         err = f2fs_quota_on_mount(sbi, i);
1911                         if (!err) {
1912                                 enabled = 1;
1913                                 continue;
1914                         }
1915                         f2fs_err(sbi, "Cannot turn on quotas: %d on %d",
1916                                  err, i);
1917                 }
1918         }
1919         return enabled;
1920 }
1921
1922 static int f2fs_quota_enable(struct super_block *sb, int type, int format_id,
1923                              unsigned int flags)
1924 {
1925         struct inode *qf_inode;
1926         unsigned long qf_inum;
1927         int err;
1928
1929         BUG_ON(!f2fs_sb_has_quota_ino(F2FS_SB(sb)));
1930
1931         qf_inum = f2fs_qf_ino(sb, type);
1932         if (!qf_inum)
1933                 return -EPERM;
1934
1935         qf_inode = f2fs_iget(sb, qf_inum);
1936         if (IS_ERR(qf_inode)) {
1937                 f2fs_err(F2FS_SB(sb), "Bad quota inode %u:%lu", type, qf_inum);
1938                 return PTR_ERR(qf_inode);
1939         }
1940
1941         /* Don't account quota for quota files to avoid recursion */
1942         qf_inode->i_flags |= S_NOQUOTA;
1943         err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
1944         iput(qf_inode);
1945         return err;
1946 }
1947
1948 static int f2fs_enable_quotas(struct super_block *sb)
1949 {
1950         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1951         int type, err = 0;
1952         unsigned long qf_inum;
1953         bool quota_mopt[MAXQUOTAS] = {
1954                 test_opt(sbi, USRQUOTA),
1955                 test_opt(sbi, GRPQUOTA),
1956                 test_opt(sbi, PRJQUOTA),
1957         };
1958
1959         if (is_set_ckpt_flags(F2FS_SB(sb), CP_QUOTA_NEED_FSCK_FLAG)) {
1960                 f2fs_err(sbi, "quota file may be corrupted, skip loading it");
1961                 return 0;
1962         }
1963
1964         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1965
1966         for (type = 0; type < MAXQUOTAS; type++) {
1967                 qf_inum = f2fs_qf_ino(sb, type);
1968                 if (qf_inum) {
1969                         err = f2fs_quota_enable(sb, type, QFMT_VFS_V1,
1970                                 DQUOT_USAGE_ENABLED |
1971                                 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
1972                         if (err) {
1973                                 f2fs_err(sbi, "Failed to enable quota tracking (type=%d, err=%d). Please run fsck to fix.",
1974                                          type, err);
1975                                 for (type--; type >= 0; type--)
1976                                         dquot_quota_off(sb, type);
1977                                 set_sbi_flag(F2FS_SB(sb),
1978                                                 SBI_QUOTA_NEED_REPAIR);
1979                                 return err;
1980                         }
1981                 }
1982         }
1983         return 0;
1984 }
1985
1986 int f2fs_quota_sync(struct super_block *sb, int type)
1987 {
1988         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1989         struct quota_info *dqopt = sb_dqopt(sb);
1990         int cnt;
1991         int ret;
1992
1993         /*
1994          * do_quotactl
1995          *  f2fs_quota_sync
1996          *  down_read(quota_sem)
1997          *  dquot_writeback_dquots()
1998          *  f2fs_dquot_commit
1999          *                            block_operation
2000          *                            down_read(quota_sem)
2001          */
2002         f2fs_lock_op(sbi);
2003
2004         down_read(&sbi->quota_sem);
2005         ret = dquot_writeback_dquots(sb, type);
2006         if (ret)
2007                 goto out;
2008
2009         /*
2010          * Now when everything is written we can discard the pagecache so
2011          * that userspace sees the changes.
2012          */
2013         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2014                 struct address_space *mapping;
2015
2016                 if (type != -1 && cnt != type)
2017                         continue;
2018                 if (!sb_has_quota_active(sb, cnt))
2019                         continue;
2020
2021                 mapping = dqopt->files[cnt]->i_mapping;
2022
2023                 ret = filemap_fdatawrite(mapping);
2024                 if (ret)
2025                         goto out;
2026
2027                 /* if we are using journalled quota */
2028                 if (is_journalled_quota(sbi))
2029                         continue;
2030
2031                 ret = filemap_fdatawait(mapping);
2032                 if (ret)
2033                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
2034
2035                 inode_lock(dqopt->files[cnt]);
2036                 truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
2037                 inode_unlock(dqopt->files[cnt]);
2038         }
2039 out:
2040         if (ret)
2041                 set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
2042         up_read(&sbi->quota_sem);
2043         f2fs_unlock_op(sbi);
2044         return ret;
2045 }
2046
2047 static int f2fs_quota_on(struct super_block *sb, int type, int format_id,
2048                                                         const struct path *path)
2049 {
2050         struct inode *inode;
2051         int err;
2052
2053         /* if quota sysfile exists, deny enabling quota with specific file */
2054         if (f2fs_sb_has_quota_ino(F2FS_SB(sb))) {
2055                 f2fs_err(F2FS_SB(sb), "quota sysfile already exists");
2056                 return -EBUSY;
2057         }
2058
2059         err = f2fs_quota_sync(sb, type);
2060         if (err)
2061                 return err;
2062
2063         err = dquot_quota_on(sb, type, format_id, path);
2064         if (err)
2065                 return err;
2066
2067         inode = d_inode(path->dentry);
2068
2069         inode_lock(inode);
2070         F2FS_I(inode)->i_flags |= F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL;
2071         f2fs_set_inode_flags(inode);
2072         inode_unlock(inode);
2073         f2fs_mark_inode_dirty_sync(inode, false);
2074
2075         return 0;
2076 }
2077
2078 static int __f2fs_quota_off(struct super_block *sb, int type)
2079 {
2080         struct inode *inode = sb_dqopt(sb)->files[type];
2081         int err;
2082
2083         if (!inode || !igrab(inode))
2084                 return dquot_quota_off(sb, type);
2085
2086         err = f2fs_quota_sync(sb, type);
2087         if (err)
2088                 goto out_put;
2089
2090         err = dquot_quota_off(sb, type);
2091         if (err || f2fs_sb_has_quota_ino(F2FS_SB(sb)))
2092                 goto out_put;
2093
2094         inode_lock(inode);
2095         F2FS_I(inode)->i_flags &= ~(F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL);
2096         f2fs_set_inode_flags(inode);
2097         inode_unlock(inode);
2098         f2fs_mark_inode_dirty_sync(inode, false);
2099 out_put:
2100         iput(inode);
2101         return err;
2102 }
2103
2104 static int f2fs_quota_off(struct super_block *sb, int type)
2105 {
2106         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2107         int err;
2108
2109         err = __f2fs_quota_off(sb, type);
2110
2111         /*
2112          * quotactl can shutdown journalled quota, result in inconsistence
2113          * between quota record and fs data by following updates, tag the
2114          * flag to let fsck be aware of it.
2115          */
2116         if (is_journalled_quota(sbi))
2117                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2118         return err;
2119 }
2120
2121 void f2fs_quota_off_umount(struct super_block *sb)
2122 {
2123         int type;
2124         int err;
2125
2126         for (type = 0; type < MAXQUOTAS; type++) {
2127                 err = __f2fs_quota_off(sb, type);
2128                 if (err) {
2129                         int ret = dquot_quota_off(sb, type);
2130
2131                         f2fs_err(F2FS_SB(sb), "Fail to turn off disk quota (type: %d, err: %d, ret:%d), Please run fsck to fix it.",
2132                                  type, err, ret);
2133                         set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
2134                 }
2135         }
2136         /*
2137          * In case of checkpoint=disable, we must flush quota blocks.
2138          * This can cause NULL exception for node_inode in end_io, since
2139          * put_super already dropped it.
2140          */
2141         sync_filesystem(sb);
2142 }
2143
2144 static void f2fs_truncate_quota_inode_pages(struct super_block *sb)
2145 {
2146         struct quota_info *dqopt = sb_dqopt(sb);
2147         int type;
2148
2149         for (type = 0; type < MAXQUOTAS; type++) {
2150                 if (!dqopt->files[type])
2151                         continue;
2152                 f2fs_inode_synced(dqopt->files[type]);
2153         }
2154 }
2155
2156 static int f2fs_dquot_commit(struct dquot *dquot)
2157 {
2158         struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
2159         int ret;
2160
2161         down_read(&sbi->quota_sem);
2162         ret = dquot_commit(dquot);
2163         if (ret < 0)
2164                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2165         up_read(&sbi->quota_sem);
2166         return ret;
2167 }
2168
2169 static int f2fs_dquot_acquire(struct dquot *dquot)
2170 {
2171         struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
2172         int ret;
2173
2174         down_read(&sbi->quota_sem);
2175         ret = dquot_acquire(dquot);
2176         if (ret < 0)
2177                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2178         up_read(&sbi->quota_sem);
2179         return ret;
2180 }
2181
2182 static int f2fs_dquot_release(struct dquot *dquot)
2183 {
2184         struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
2185         int ret;
2186
2187         down_read(&sbi->quota_sem);
2188         ret = dquot_release(dquot);
2189         if (ret < 0)
2190                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2191         up_read(&sbi->quota_sem);
2192         return ret;
2193 }
2194
2195 static int f2fs_dquot_mark_dquot_dirty(struct dquot *dquot)
2196 {
2197         struct super_block *sb = dquot->dq_sb;
2198         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2199         int ret;
2200
2201         down_read(&sbi->quota_sem);
2202         ret = dquot_mark_dquot_dirty(dquot);
2203
2204         /* if we are using journalled quota */
2205         if (is_journalled_quota(sbi))
2206                 set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
2207
2208         up_read(&sbi->quota_sem);
2209         return ret;
2210 }
2211
2212 static int f2fs_dquot_commit_info(struct super_block *sb, int type)
2213 {
2214         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2215         int ret;
2216
2217         down_read(&sbi->quota_sem);
2218         ret = dquot_commit_info(sb, type);
2219         if (ret < 0)
2220                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
2221         up_read(&sbi->quota_sem);
2222         return ret;
2223 }
2224
2225 static int f2fs_get_projid(struct inode *inode, kprojid_t *projid)
2226 {
2227         *projid = F2FS_I(inode)->i_projid;
2228         return 0;
2229 }
2230
2231 static const struct dquot_operations f2fs_quota_operations = {
2232         .get_reserved_space = f2fs_get_reserved_space,
2233         .write_dquot    = f2fs_dquot_commit,
2234         .acquire_dquot  = f2fs_dquot_acquire,
2235         .release_dquot  = f2fs_dquot_release,
2236         .mark_dirty     = f2fs_dquot_mark_dquot_dirty,
2237         .write_info     = f2fs_dquot_commit_info,
2238         .alloc_dquot    = dquot_alloc,
2239         .destroy_dquot  = dquot_destroy,
2240         .get_projid     = f2fs_get_projid,
2241         .get_next_id    = dquot_get_next_id,
2242 };
2243
2244 static const struct quotactl_ops f2fs_quotactl_ops = {
2245         .quota_on       = f2fs_quota_on,
2246         .quota_off      = f2fs_quota_off,
2247         .quota_sync     = f2fs_quota_sync,
2248         .get_state      = dquot_get_state,
2249         .set_info       = dquot_set_dqinfo,
2250         .get_dqblk      = dquot_get_dqblk,
2251         .set_dqblk      = dquot_set_dqblk,
2252         .get_nextdqblk  = dquot_get_next_dqblk,
2253 };
2254 #else
2255 int f2fs_quota_sync(struct super_block *sb, int type)
2256 {
2257         return 0;
2258 }
2259
2260 void f2fs_quota_off_umount(struct super_block *sb)
2261 {
2262 }
2263 #endif
2264
2265 static const struct super_operations f2fs_sops = {
2266         .alloc_inode    = f2fs_alloc_inode,
2267         .free_inode     = f2fs_free_inode,
2268         .drop_inode     = f2fs_drop_inode,
2269         .write_inode    = f2fs_write_inode,
2270         .dirty_inode    = f2fs_dirty_inode,
2271         .show_options   = f2fs_show_options,
2272 #ifdef CONFIG_QUOTA
2273         .quota_read     = f2fs_quota_read,
2274         .quota_write    = f2fs_quota_write,
2275         .get_dquots     = f2fs_get_dquots,
2276 #endif
2277         .evict_inode    = f2fs_evict_inode,
2278         .put_super      = f2fs_put_super,
2279         .sync_fs        = f2fs_sync_fs,
2280         .freeze_fs      = f2fs_freeze,
2281         .unfreeze_fs    = f2fs_unfreeze,
2282         .statfs         = f2fs_statfs,
2283         .remount_fs     = f2fs_remount,
2284 };
2285
2286 #ifdef CONFIG_FS_ENCRYPTION
2287 static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
2288 {
2289         return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
2290                                 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
2291                                 ctx, len, NULL);
2292 }
2293
2294 static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
2295                                                         void *fs_data)
2296 {
2297         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2298
2299         /*
2300          * Encrypting the root directory is not allowed because fsck
2301          * expects lost+found directory to exist and remain unencrypted
2302          * if LOST_FOUND feature is enabled.
2303          *
2304          */
2305         if (f2fs_sb_has_lost_found(sbi) &&
2306                         inode->i_ino == F2FS_ROOT_INO(sbi))
2307                 return -EPERM;
2308
2309         return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
2310                                 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
2311                                 ctx, len, fs_data, XATTR_CREATE);
2312 }
2313
2314 static bool f2fs_dummy_context(struct inode *inode)
2315 {
2316         return DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(inode));
2317 }
2318
2319 static bool f2fs_has_stable_inodes(struct super_block *sb)
2320 {
2321         return true;
2322 }
2323
2324 static void f2fs_get_ino_and_lblk_bits(struct super_block *sb,
2325                                        int *ino_bits_ret, int *lblk_bits_ret)
2326 {
2327         *ino_bits_ret = 8 * sizeof(nid_t);
2328         *lblk_bits_ret = 8 * sizeof(block_t);
2329 }
2330
2331 static const struct fscrypt_operations f2fs_cryptops = {
2332         .key_prefix             = "f2fs:",
2333         .get_context            = f2fs_get_context,
2334         .set_context            = f2fs_set_context,
2335         .dummy_context          = f2fs_dummy_context,
2336         .empty_dir              = f2fs_empty_dir,
2337         .max_namelen            = F2FS_NAME_LEN,
2338         .has_stable_inodes      = f2fs_has_stable_inodes,
2339         .get_ino_and_lblk_bits  = f2fs_get_ino_and_lblk_bits,
2340 };
2341 #endif
2342
2343 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
2344                 u64 ino, u32 generation)
2345 {
2346         struct f2fs_sb_info *sbi = F2FS_SB(sb);
2347         struct inode *inode;
2348
2349         if (f2fs_check_nid_range(sbi, ino))
2350                 return ERR_PTR(-ESTALE);
2351
2352         /*
2353          * f2fs_iget isn't quite right if the inode is currently unallocated!
2354          * However f2fs_iget currently does appropriate checks to handle stale
2355          * inodes so everything is OK.
2356          */
2357         inode = f2fs_iget(sb, ino);
2358         if (IS_ERR(inode))
2359                 return ERR_CAST(inode);
2360         if (unlikely(generation && inode->i_generation != generation)) {
2361                 /* we didn't find the right inode.. */
2362                 iput(inode);
2363                 return ERR_PTR(-ESTALE);
2364         }
2365         return inode;
2366 }
2367
2368 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
2369                 int fh_len, int fh_type)
2370 {
2371         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
2372                                     f2fs_nfs_get_inode);
2373 }
2374
2375 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
2376                 int fh_len, int fh_type)
2377 {
2378         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
2379                                     f2fs_nfs_get_inode);
2380 }
2381
2382 static const struct export_operations f2fs_export_ops = {
2383         .fh_to_dentry = f2fs_fh_to_dentry,
2384         .fh_to_parent = f2fs_fh_to_parent,
2385         .get_parent = f2fs_get_parent,
2386 };
2387
2388 static loff_t max_file_blocks(void)
2389 {
2390         loff_t result = 0;
2391         loff_t leaf_count = DEF_ADDRS_PER_BLOCK;
2392
2393         /*
2394          * note: previously, result is equal to (DEF_ADDRS_PER_INODE -
2395          * DEFAULT_INLINE_XATTR_ADDRS), but now f2fs try to reserve more
2396          * space in inode.i_addr, it will be more safe to reassign
2397          * result as zero.
2398          */
2399
2400         /* two direct node blocks */
2401         result += (leaf_count * 2);
2402
2403         /* two indirect node blocks */
2404         leaf_count *= NIDS_PER_BLOCK;
2405         result += (leaf_count * 2);
2406
2407         /* one double indirect node block */
2408         leaf_count *= NIDS_PER_BLOCK;
2409         result += leaf_count;
2410
2411         return result;
2412 }
2413
2414 static int __f2fs_commit_super(struct buffer_head *bh,
2415                         struct f2fs_super_block *super)
2416 {
2417         lock_buffer(bh);
2418         if (super)
2419                 memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
2420         set_buffer_dirty(bh);
2421         unlock_buffer(bh);
2422
2423         /* it's rare case, we can do fua all the time */
2424         return __sync_dirty_buffer(bh, REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
2425 }
2426
2427 static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
2428                                         struct buffer_head *bh)
2429 {
2430         struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
2431                                         (bh->b_data + F2FS_SUPER_OFFSET);
2432         struct super_block *sb = sbi->sb;
2433         u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
2434         u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr);
2435         u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr);
2436         u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr);
2437         u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
2438         u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
2439         u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt);
2440         u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit);
2441         u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat);
2442         u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa);
2443         u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main);
2444         u32 segment_count = le32_to_cpu(raw_super->segment_count);
2445         u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
2446         u64 main_end_blkaddr = main_blkaddr +
2447                                 (segment_count_main << log_blocks_per_seg);
2448         u64 seg_end_blkaddr = segment0_blkaddr +
2449                                 (segment_count << log_blocks_per_seg);
2450
2451         if (segment0_blkaddr != cp_blkaddr) {
2452                 f2fs_info(sbi, "Mismatch start address, segment0(%u) cp_blkaddr(%u)",
2453                           segment0_blkaddr, cp_blkaddr);
2454                 return true;
2455         }
2456
2457         if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) !=
2458                                                         sit_blkaddr) {
2459                 f2fs_info(sbi, "Wrong CP boundary, start(%u) end(%u) blocks(%u)",
2460                           cp_blkaddr, sit_blkaddr,
2461                           segment_count_ckpt << log_blocks_per_seg);
2462                 return true;
2463         }
2464
2465         if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) !=
2466                                                         nat_blkaddr) {
2467                 f2fs_info(sbi, "Wrong SIT boundary, start(%u) end(%u) blocks(%u)",
2468                           sit_blkaddr, nat_blkaddr,
2469                           segment_count_sit << log_blocks_per_seg);
2470                 return true;
2471         }
2472
2473         if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) !=
2474                                                         ssa_blkaddr) {
2475                 f2fs_info(sbi, "Wrong NAT boundary, start(%u) end(%u) blocks(%u)",
2476                           nat_blkaddr, ssa_blkaddr,
2477                           segment_count_nat << log_blocks_per_seg);
2478                 return true;
2479         }
2480
2481         if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) !=
2482                                                         main_blkaddr) {
2483                 f2fs_info(sbi, "Wrong SSA boundary, start(%u) end(%u) blocks(%u)",
2484                           ssa_blkaddr, main_blkaddr,
2485                           segment_count_ssa << log_blocks_per_seg);
2486                 return true;
2487         }
2488
2489         if (main_end_blkaddr > seg_end_blkaddr) {
2490                 f2fs_info(sbi, "Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
2491                           main_blkaddr,
2492                           segment0_blkaddr +
2493                           (segment_count << log_blocks_per_seg),
2494                           segment_count_main << log_blocks_per_seg);
2495                 return true;
2496         } else if (main_end_blkaddr < seg_end_blkaddr) {
2497                 int err = 0;
2498                 char *res;
2499
2500                 /* fix in-memory information all the time */
2501                 raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
2502                                 segment0_blkaddr) >> log_blocks_per_seg);
2503
2504                 if (f2fs_readonly(sb) || bdev_read_only(sb->s_bdev)) {
2505                         set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
2506                         res = "internally";
2507                 } else {
2508                         err = __f2fs_commit_super(bh, NULL);
2509                         res = err ? "failed" : "done";
2510                 }
2511                 f2fs_info(sbi, "Fix alignment : %s, start(%u) end(%u) block(%u)",
2512                           res, main_blkaddr,
2513                           segment0_blkaddr +
2514                           (segment_count << log_blocks_per_seg),
2515                           segment_count_main << log_blocks_per_seg);
2516                 if (err)
2517                         return true;
2518         }
2519         return false;
2520 }
2521
2522 static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
2523                                 struct buffer_head *bh)
2524 {
2525         block_t segment_count, segs_per_sec, secs_per_zone;
2526         block_t total_sections, blocks_per_seg;
2527         struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
2528                                         (bh->b_data + F2FS_SUPER_OFFSET);
2529         unsigned int blocksize;
2530         size_t crc_offset = 0;
2531         __u32 crc = 0;
2532
2533         if (le32_to_cpu(raw_super->magic) != F2FS_SUPER_MAGIC) {
2534                 f2fs_info(sbi, "Magic Mismatch, valid(0x%x) - read(0x%x)",
2535                           F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
2536                 return -EINVAL;
2537         }
2538
2539         /* Check checksum_offset and crc in superblock */
2540         if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_SB_CHKSUM)) {
2541                 crc_offset = le32_to_cpu(raw_super->checksum_offset);
2542                 if (crc_offset !=
2543                         offsetof(struct f2fs_super_block, crc)) {
2544                         f2fs_info(sbi, "Invalid SB checksum offset: %zu",
2545                                   crc_offset);
2546                         return -EFSCORRUPTED;
2547                 }
2548                 crc = le32_to_cpu(raw_super->crc);
2549                 if (!f2fs_crc_valid(sbi, crc, raw_super, crc_offset)) {
2550                         f2fs_info(sbi, "Invalid SB checksum value: %u", crc);
2551                         return -EFSCORRUPTED;
2552                 }
2553         }
2554
2555         /* Currently, support only 4KB page cache size */
2556         if (F2FS_BLKSIZE != PAGE_SIZE) {
2557                 f2fs_info(sbi, "Invalid page_cache_size (%lu), supports only 4KB",
2558                           PAGE_SIZE);
2559                 return -EFSCORRUPTED;
2560         }
2561
2562         /* Currently, support only 4KB block size */
2563         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
2564         if (blocksize != F2FS_BLKSIZE) {
2565                 f2fs_info(sbi, "Invalid blocksize (%u), supports only 4KB",
2566                           blocksize);
2567                 return -EFSCORRUPTED;
2568         }
2569
2570         /* check log blocks per segment */
2571         if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
2572                 f2fs_info(sbi, "Invalid log blocks per segment (%u)",
2573                           le32_to_cpu(raw_super->log_blocks_per_seg));
2574                 return -EFSCORRUPTED;
2575         }
2576
2577         /* Currently, support 512/1024/2048/4096 bytes sector size */
2578         if (le32_to_cpu(raw_super->log_sectorsize) >
2579                                 F2FS_MAX_LOG_SECTOR_SIZE ||
2580                 le32_to_cpu(raw_super->log_sectorsize) <
2581                                 F2FS_MIN_LOG_SECTOR_SIZE) {
2582                 f2fs_info(sbi, "Invalid log sectorsize (%u)",
2583                           le32_to_cpu(raw_super->log_sectorsize));
2584                 return -EFSCORRUPTED;
2585         }
2586         if (le32_to_cpu(raw_super->log_sectors_per_block) +
2587                 le32_to_cpu(raw_super->log_sectorsize) !=
2588                         F2FS_MAX_LOG_SECTOR_SIZE) {
2589                 f2fs_info(sbi, "Invalid log sectors per block(%u) log sectorsize(%u)",
2590                           le32_to_cpu(raw_super->log_sectors_per_block),
2591                           le32_to_cpu(raw_super->log_sectorsize));
2592                 return -EFSCORRUPTED;
2593         }
2594
2595         segment_count = le32_to_cpu(raw_super->segment_count);
2596         segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
2597         secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
2598         total_sections = le32_to_cpu(raw_super->section_count);
2599
2600         /* blocks_per_seg should be 512, given the above check */
2601         blocks_per_seg = 1 << le32_to_cpu(raw_super->log_blocks_per_seg);
2602
2603         if (segment_count > F2FS_MAX_SEGMENT ||
2604                                 segment_count < F2FS_MIN_SEGMENTS) {
2605                 f2fs_info(sbi, "Invalid segment count (%u)", segment_count);
2606                 return -EFSCORRUPTED;
2607         }
2608
2609         if (total_sections > segment_count ||
2610                         total_sections < F2FS_MIN_SEGMENTS ||
2611                         segs_per_sec > segment_count || !segs_per_sec) {
2612                 f2fs_info(sbi, "Invalid segment/section count (%u, %u x %u)",
2613                           segment_count, total_sections, segs_per_sec);
2614                 return -EFSCORRUPTED;
2615         }
2616
2617         if ((segment_count / segs_per_sec) < total_sections) {
2618                 f2fs_info(sbi, "Small segment_count (%u < %u * %u)",
2619                           segment_count, segs_per_sec, total_sections);
2620                 return -EFSCORRUPTED;
2621         }
2622
2623         if (segment_count > (le64_to_cpu(raw_super->block_count) >> 9)) {
2624                 f2fs_info(sbi, "Wrong segment_count / block_count (%u > %llu)",
2625                           segment_count, le64_to_cpu(raw_super->block_count));
2626                 return -EFSCORRUPTED;
2627         }
2628
2629         if (RDEV(0).path[0]) {
2630                 block_t dev_seg_count = le32_to_cpu(RDEV(0).total_segments);
2631                 int i = 1;
2632
2633                 while (i < MAX_DEVICES && RDEV(i).path[0]) {
2634                         dev_seg_count += le32_to_cpu(RDEV(i).total_segments);
2635                         i++;
2636                 }
2637                 if (segment_count != dev_seg_count) {
2638                         f2fs_info(sbi, "Segment count (%u) mismatch with total segments from devices (%u)",
2639                                         segment_count, dev_seg_count);
2640                         return -EFSCORRUPTED;
2641                 }
2642         }
2643
2644         if (secs_per_zone > total_sections || !secs_per_zone) {
2645                 f2fs_info(sbi, "Wrong secs_per_zone / total_sections (%u, %u)",
2646                           secs_per_zone, total_sections);
2647                 return -EFSCORRUPTED;
2648         }
2649         if (le32_to_cpu(raw_super->extension_count) > F2FS_MAX_EXTENSION ||
2650                         raw_super->hot_ext_count > F2FS_MAX_EXTENSION ||
2651                         (le32_to_cpu(raw_super->extension_count) +
2652                         raw_super->hot_ext_count) > F2FS_MAX_EXTENSION) {
2653                 f2fs_info(sbi, "Corrupted extension count (%u + %u > %u)",
2654                           le32_to_cpu(raw_super->extension_count),
2655                           raw_super->hot_ext_count,
2656                           F2FS_MAX_EXTENSION);
2657                 return -EFSCORRUPTED;
2658         }
2659
2660         if (le32_to_cpu(raw_super->cp_payload) >
2661                                 (blocks_per_seg - F2FS_CP_PACKS)) {
2662                 f2fs_info(sbi, "Insane cp_payload (%u > %u)",
2663                           le32_to_cpu(raw_super->cp_payload),
2664                           blocks_per_seg - F2FS_CP_PACKS);
2665                 return -EFSCORRUPTED;
2666         }
2667
2668         /* check reserved ino info */
2669         if (le32_to_cpu(raw_super->node_ino) != 1 ||
2670                 le32_to_cpu(raw_super->meta_ino) != 2 ||
2671                 le32_to_cpu(raw_super->root_ino) != 3) {
2672                 f2fs_info(sbi, "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)",
2673                           le32_to_cpu(raw_super->node_ino),
2674                           le32_to_cpu(raw_super->meta_ino),
2675                           le32_to_cpu(raw_super->root_ino));
2676                 return -EFSCORRUPTED;
2677         }
2678
2679         /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
2680         if (sanity_check_area_boundary(sbi, bh))
2681                 return -EFSCORRUPTED;
2682
2683         return 0;
2684 }
2685
2686 int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
2687 {
2688         unsigned int total, fsmeta;
2689         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
2690         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
2691         unsigned int ovp_segments, reserved_segments;
2692         unsigned int main_segs, blocks_per_seg;
2693         unsigned int sit_segs, nat_segs;
2694         unsigned int sit_bitmap_size, nat_bitmap_size;
2695         unsigned int log_blocks_per_seg;
2696         unsigned int segment_count_main;
2697         unsigned int cp_pack_start_sum, cp_payload;
2698         block_t user_block_count, valid_user_blocks;
2699         block_t avail_node_count, valid_node_count;
2700         int i, j;
2701
2702         total = le32_to_cpu(raw_super->segment_count);
2703         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
2704         sit_segs = le32_to_cpu(raw_super->segment_count_sit);
2705         fsmeta += sit_segs;
2706         nat_segs = le32_to_cpu(raw_super->segment_count_nat);
2707         fsmeta += nat_segs;
2708         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
2709         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
2710
2711         if (unlikely(fsmeta >= total))
2712                 return 1;
2713
2714         ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
2715         reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
2716
2717         if (unlikely(fsmeta < F2FS_MIN_SEGMENTS ||
2718                         ovp_segments == 0 || reserved_segments == 0)) {
2719                 f2fs_err(sbi, "Wrong layout: check mkfs.f2fs version");
2720                 return 1;
2721         }
2722
2723         user_block_count = le64_to_cpu(ckpt->user_block_count);
2724         segment_count_main = le32_to_cpu(raw_super->segment_count_main);
2725         log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
2726         if (!user_block_count || user_block_count >=
2727                         segment_count_main << log_blocks_per_seg) {
2728                 f2fs_err(sbi, "Wrong user_block_count: %u",
2729                          user_block_count);
2730                 return 1;
2731         }
2732
2733         valid_user_blocks = le64_to_cpu(ckpt->valid_block_count);
2734         if (valid_user_blocks > user_block_count) {
2735                 f2fs_err(sbi, "Wrong valid_user_blocks: %u, user_block_count: %u",
2736                          valid_user_blocks, user_block_count);
2737                 return 1;
2738         }
2739
2740         valid_node_count = le32_to_cpu(ckpt->valid_node_count);
2741         avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
2742         if (valid_node_count > avail_node_count) {
2743                 f2fs_err(sbi, "Wrong valid_node_count: %u, avail_node_count: %u",
2744                          valid_node_count, avail_node_count);
2745                 return 1;
2746         }
2747
2748         main_segs = le32_to_cpu(raw_super->segment_count_main);
2749         blocks_per_seg = sbi->blocks_per_seg;
2750
2751         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
2752                 if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
2753                         le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg)
2754                         return 1;
2755                 for (j = i + 1; j < NR_CURSEG_NODE_TYPE; j++) {
2756                         if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
2757                                 le32_to_cpu(ckpt->cur_node_segno[j])) {
2758                                 f2fs_err(sbi, "Node segment (%u, %u) has the same segno: %u",
2759                                          i, j,
2760                                          le32_to_cpu(ckpt->cur_node_segno[i]));
2761                                 return 1;
2762                         }
2763                 }
2764         }
2765         for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
2766                 if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
2767                         le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg)
2768                         return 1;
2769                 for (j = i + 1; j < NR_CURSEG_DATA_TYPE; j++) {
2770                         if (le32_to_cpu(ckpt->cur_data_segno[i]) ==
2771                                 le32_to_cpu(ckpt->cur_data_segno[j])) {
2772                                 f2fs_err(sbi, "Data segment (%u, %u) has the same segno: %u",
2773                                          i, j,
2774                                          le32_to_cpu(ckpt->cur_data_segno[i]));
2775                                 return 1;
2776                         }
2777                 }
2778         }
2779         for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
2780                 for (j = 0; j < NR_CURSEG_DATA_TYPE; j++) {
2781                         if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
2782                                 le32_to_cpu(ckpt->cur_data_segno[j])) {
2783                                 f2fs_err(sbi, "Node segment (%u) and Data segment (%u) has the same segno: %u",
2784                                          i, j,
2785                                          le32_to_cpu(ckpt->cur_node_segno[i]));
2786                                 return 1;
2787                         }
2788                 }
2789         }
2790
2791         sit_bitmap_size = le32_to_cpu(ckpt->sit_ver_bitmap_bytesize);
2792         nat_bitmap_size = le32_to_cpu(ckpt->nat_ver_bitmap_bytesize);
2793
2794         if (sit_bitmap_size != ((sit_segs / 2) << log_blocks_per_seg) / 8 ||
2795                 nat_bitmap_size != ((nat_segs / 2) << log_blocks_per_seg) / 8) {
2796                 f2fs_err(sbi, "Wrong bitmap size: sit: %u, nat:%u",
2797                          sit_bitmap_size, nat_bitmap_size);
2798                 return 1;
2799         }
2800
2801         cp_pack_start_sum = __start_sum_addr(sbi);
2802         cp_payload = __cp_payload(sbi);
2803         if (cp_pack_start_sum < cp_payload + 1 ||
2804                 cp_pack_start_sum > blocks_per_seg - 1 -
2805                         NR_CURSEG_TYPE) {
2806                 f2fs_err(sbi, "Wrong cp_pack_start_sum: %u",
2807                          cp_pack_start_sum);
2808                 return 1;
2809         }
2810
2811         if (__is_set_ckpt_flags(ckpt, CP_LARGE_NAT_BITMAP_FLAG) &&
2812                 le32_to_cpu(ckpt->checksum_offset) != CP_MIN_CHKSUM_OFFSET) {
2813                 f2fs_warn(sbi, "using deprecated layout of large_nat_bitmap, "
2814                           "please run fsck v1.13.0 or higher to repair, chksum_offset: %u, "
2815                           "fixed with patch: \"f2fs-tools: relocate chksum_offset for large_nat_bitmap feature\"",
2816                           le32_to_cpu(ckpt->checksum_offset));
2817                 return 1;
2818         }
2819
2820         if (unlikely(f2fs_cp_error(sbi))) {
2821                 f2fs_err(sbi, "A bug case: need to run fsck");
2822                 return 1;
2823         }
2824         return 0;
2825 }
2826
2827 static void init_sb_info(struct f2fs_sb_info *sbi)
2828 {
2829         struct f2fs_super_block *raw_super = sbi->raw_super;
2830         int i;
2831
2832         sbi->log_sectors_per_block =
2833                 le32_to_cpu(raw_super->log_sectors_per_block);
2834         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
2835         sbi->blocksize = 1 << sbi->log_blocksize;
2836         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
2837         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
2838         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
2839         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
2840         sbi->total_sections = le32_to_cpu(raw_super->section_count);
2841         sbi->total_node_count =
2842                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
2843                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
2844         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
2845         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
2846         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
2847         sbi->cur_victim_sec = NULL_SECNO;
2848         sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
2849         sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
2850         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
2851         sbi->migration_granularity = sbi->segs_per_sec;
2852
2853         sbi->dir_level = DEF_DIR_LEVEL;
2854         sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
2855         sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
2856         sbi->interval_time[DISCARD_TIME] = DEF_IDLE_INTERVAL;
2857         sbi->interval_time[GC_TIME] = DEF_IDLE_INTERVAL;
2858         sbi->interval_time[DISABLE_TIME] = DEF_DISABLE_INTERVAL;
2859         sbi->interval_time[UMOUNT_DISCARD_TIMEOUT] =
2860                                 DEF_UMOUNT_DISCARD_TIMEOUT;
2861         clear_sbi_flag(sbi, SBI_NEED_FSCK);
2862
2863         for (i = 0; i < NR_COUNT_TYPE; i++)
2864                 atomic_set(&sbi->nr_pages[i], 0);
2865
2866         for (i = 0; i < META; i++)
2867                 atomic_set(&sbi->wb_sync_req[i], 0);
2868
2869         INIT_LIST_HEAD(&sbi->s_list);
2870         mutex_init(&sbi->umount_mutex);
2871         init_rwsem(&sbi->io_order_lock);
2872         spin_lock_init(&sbi->cp_lock);
2873
2874         sbi->dirty_device = 0;
2875         spin_lock_init(&sbi->dev_lock);
2876
2877         init_rwsem(&sbi->sb_lock);
2878         init_rwsem(&sbi->pin_sem);
2879 }
2880
2881 static int init_percpu_info(struct f2fs_sb_info *sbi)
2882 {
2883         int err;
2884
2885         err = percpu_counter_init(&sbi->alloc_valid_block_count, 0, GFP_KERNEL);
2886         if (err)
2887                 return err;
2888
2889         err = percpu_counter_init(&sbi->total_valid_inode_count, 0,
2890                                                                 GFP_KERNEL);
2891         if (err)
2892                 percpu_counter_destroy(&sbi->alloc_valid_block_count);
2893
2894         return err;
2895 }
2896
2897 #ifdef CONFIG_BLK_DEV_ZONED
2898 static int f2fs_report_zone_cb(struct blk_zone *zone, unsigned int idx,
2899                                void *data)
2900 {
2901         struct f2fs_dev_info *dev = data;
2902
2903         if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL)
2904                 set_bit(idx, dev->blkz_seq);
2905         return 0;
2906 }
2907
2908 static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
2909 {
2910         struct block_device *bdev = FDEV(devi).bdev;
2911         sector_t nr_sectors = bdev->bd_part->nr_sects;
2912         int ret;
2913
2914         if (!f2fs_sb_has_blkzoned(sbi))
2915                 return 0;
2916
2917         if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
2918                                 SECTOR_TO_BLOCK(bdev_zone_sectors(bdev)))
2919                 return -EINVAL;
2920         sbi->blocks_per_blkz = SECTOR_TO_BLOCK(bdev_zone_sectors(bdev));
2921         if (sbi->log_blocks_per_blkz && sbi->log_blocks_per_blkz !=
2922                                 __ilog2_u32(sbi->blocks_per_blkz))
2923                 return -EINVAL;
2924         sbi->log_blocks_per_blkz = __ilog2_u32(sbi->blocks_per_blkz);
2925         FDEV(devi).nr_blkz = SECTOR_TO_BLOCK(nr_sectors) >>
2926                                         sbi->log_blocks_per_blkz;
2927         if (nr_sectors & (bdev_zone_sectors(bdev) - 1))
2928                 FDEV(devi).nr_blkz++;
2929
2930         FDEV(devi).blkz_seq = f2fs_kzalloc(sbi,
2931                                         BITS_TO_LONGS(FDEV(devi).nr_blkz)
2932                                         * sizeof(unsigned long),
2933                                         GFP_KERNEL);
2934         if (!FDEV(devi).blkz_seq)
2935                 return -ENOMEM;
2936
2937         /* Get block zones type */
2938         ret = blkdev_report_zones(bdev, 0, BLK_ALL_ZONES, f2fs_report_zone_cb,
2939                                   &FDEV(devi));
2940         if (ret < 0)
2941                 return ret;
2942
2943         return 0;
2944 }
2945 #endif
2946
2947 /*
2948  * Read f2fs raw super block.
2949  * Because we have two copies of super block, so read both of them
2950  * to get the first valid one. If any one of them is broken, we pass
2951  * them recovery flag back to the caller.
2952  */
2953 static int read_raw_super_block(struct f2fs_sb_info *sbi,
2954                         struct f2fs_super_block **raw_super,
2955                         int *valid_super_block, int *recovery)
2956 {
2957         struct super_block *sb = sbi->sb;
2958         int block;
2959         struct buffer_head *bh;
2960         struct f2fs_super_block *super;
2961         int err = 0;
2962
2963         super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
2964         if (!super)
2965                 return -ENOMEM;
2966
2967         for (block = 0; block < 2; block++) {
2968                 bh = sb_bread(sb, block);
2969                 if (!bh) {
2970                         f2fs_err(sbi, "Unable to read %dth superblock",
2971                                  block + 1);
2972                         err = -EIO;
2973                         *recovery = 1;
2974                         continue;
2975                 }
2976
2977                 /* sanity checking of raw super */
2978                 err = sanity_check_raw_super(sbi, bh);
2979                 if (err) {
2980                         f2fs_err(sbi, "Can't find valid F2FS filesystem in %dth superblock",
2981                                  block + 1);
2982                         brelse(bh);
2983                         *recovery = 1;
2984                         continue;
2985                 }
2986
2987                 if (!*raw_super) {
2988                         memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
2989                                                         sizeof(*super));
2990                         *valid_super_block = block;
2991                         *raw_super = super;
2992                 }
2993                 brelse(bh);
2994         }
2995
2996         /* No valid superblock */
2997         if (!*raw_super)
2998                 kvfree(super);
2999         else
3000                 err = 0;
3001
3002         return err;
3003 }
3004
3005 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
3006 {
3007         struct buffer_head *bh;
3008         __u32 crc = 0;
3009         int err;
3010
3011         if ((recover && f2fs_readonly(sbi->sb)) ||
3012                                 bdev_read_only(sbi->sb->s_bdev)) {
3013                 set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
3014                 return -EROFS;
3015         }
3016
3017         /* we should update superblock crc here */
3018         if (!recover && f2fs_sb_has_sb_chksum(sbi)) {
3019                 crc = f2fs_crc32(sbi, F2FS_RAW_SUPER(sbi),
3020                                 offsetof(struct f2fs_super_block, crc));
3021                 F2FS_RAW_SUPER(sbi)->crc = cpu_to_le32(crc);
3022         }
3023
3024         /* write back-up superblock first */
3025         bh = sb_bread(sbi->sb, sbi->valid_super_block ? 0 : 1);
3026         if (!bh)
3027                 return -EIO;
3028         err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
3029         brelse(bh);
3030
3031         /* if we are in recovery path, skip writing valid superblock */
3032         if (recover || err)
3033                 return err;
3034
3035         /* write current valid superblock */
3036         bh = sb_bread(sbi->sb, sbi->valid_super_block);
3037         if (!bh)
3038                 return -EIO;
3039         err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
3040         brelse(bh);
3041         return err;
3042 }
3043
3044 static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
3045 {
3046         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
3047         unsigned int max_devices = MAX_DEVICES;
3048         int i;
3049
3050         /* Initialize single device information */
3051         if (!RDEV(0).path[0]) {
3052                 if (!bdev_is_zoned(sbi->sb->s_bdev))
3053                         return 0;
3054                 max_devices = 1;
3055         }
3056
3057         /*
3058          * Initialize multiple devices information, or single
3059          * zoned block device information.
3060          */
3061         sbi->devs = f2fs_kzalloc(sbi,
3062                                  array_size(max_devices,
3063                                             sizeof(struct f2fs_dev_info)),
3064                                  GFP_KERNEL);
3065         if (!sbi->devs)
3066                 return -ENOMEM;
3067
3068         for (i = 0; i < max_devices; i++) {
3069
3070                 if (i > 0 && !RDEV(i).path[0])
3071                         break;
3072
3073                 if (max_devices == 1) {
3074                         /* Single zoned block device mount */
3075                         FDEV(0).bdev =
3076                                 blkdev_get_by_dev(sbi->sb->s_bdev->bd_dev,
3077                                         sbi->sb->s_mode, sbi->sb->s_type);
3078                 } else {
3079                         /* Multi-device mount */
3080                         memcpy(FDEV(i).path, RDEV(i).path, MAX_PATH_LEN);
3081                         FDEV(i).total_segments =
3082                                 le32_to_cpu(RDEV(i).total_segments);
3083                         if (i == 0) {
3084                                 FDEV(i).start_blk = 0;
3085                                 FDEV(i).end_blk = FDEV(i).start_blk +
3086                                     (FDEV(i).total_segments <<
3087                                     sbi->log_blocks_per_seg) - 1 +
3088                                     le32_to_cpu(raw_super->segment0_blkaddr);
3089                         } else {
3090                                 FDEV(i).start_blk = FDEV(i - 1).end_blk + 1;
3091                                 FDEV(i).end_blk = FDEV(i).start_blk +
3092                                         (FDEV(i).total_segments <<
3093                                         sbi->log_blocks_per_seg) - 1;
3094                         }
3095                         FDEV(i).bdev = blkdev_get_by_path(FDEV(i).path,
3096                                         sbi->sb->s_mode, sbi->sb->s_type);
3097                 }
3098                 if (IS_ERR(FDEV(i).bdev))
3099                         return PTR_ERR(FDEV(i).bdev);
3100
3101                 /* to release errored devices */
3102                 sbi->s_ndevs = i + 1;
3103
3104 #ifdef CONFIG_BLK_DEV_ZONED
3105                 if (bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HM &&
3106                                 !f2fs_sb_has_blkzoned(sbi)) {
3107                         f2fs_err(sbi, "Zoned block device feature not enabled\n");
3108                         return -EINVAL;
3109                 }
3110                 if (bdev_zoned_model(FDEV(i).bdev) != BLK_ZONED_NONE) {
3111                         if (init_blkz_info(sbi, i)) {
3112                                 f2fs_err(sbi, "Failed to initialize F2FS blkzone information");
3113                                 return -EINVAL;
3114                         }
3115                         if (max_devices == 1)
3116                                 break;
3117                         f2fs_info(sbi, "Mount Device [%2d]: %20s, %8u, %8x - %8x (zone: %s)",
3118                                   i, FDEV(i).path,
3119                                   FDEV(i).total_segments,
3120                                   FDEV(i).start_blk, FDEV(i).end_blk,
3121                                   bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HA ?
3122                                   "Host-aware" : "Host-managed");
3123                         continue;
3124                 }
3125 #endif
3126                 f2fs_info(sbi, "Mount Device [%2d]: %20s, %8u, %8x - %8x",
3127                           i, FDEV(i).path,
3128                           FDEV(i).total_segments,
3129                           FDEV(i).start_blk, FDEV(i).end_blk);
3130         }
3131         f2fs_info(sbi,
3132                   "IO Block Size: %8d KB", F2FS_IO_SIZE_KB(sbi));
3133         return 0;
3134 }
3135
3136 static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
3137 {
3138 #ifdef CONFIG_UNICODE
3139         if (f2fs_sb_has_casefold(sbi) && !sbi->s_encoding) {
3140                 const struct f2fs_sb_encodings *encoding_info;
3141                 struct unicode_map *encoding;
3142                 __u16 encoding_flags;
3143
3144                 if (f2fs_sb_has_encrypt(sbi)) {
3145                         f2fs_err(sbi,
3146                                 "Can't mount with encoding and encryption");
3147                         return -EINVAL;
3148                 }
3149
3150                 if (f2fs_sb_read_encoding(sbi->raw_super, &encoding_info,
3151                                           &encoding_flags)) {
3152                         f2fs_err(sbi,
3153                                  "Encoding requested by superblock is unknown");
3154                         return -EINVAL;
3155                 }
3156
3157                 encoding = utf8_load(encoding_info->version);
3158                 if (IS_ERR(encoding)) {
3159                         f2fs_err(sbi,
3160                                  "can't mount with superblock charset: %s-%s "
3161                                  "not supported by the kernel. flags: 0x%x.",
3162                                  encoding_info->name, encoding_info->version,
3163                                  encoding_flags);
3164                         return PTR_ERR(encoding);
3165                 }
3166                 f2fs_info(sbi, "Using encoding defined by superblock: "
3167                          "%s-%s with flags 0x%hx", encoding_info->name,
3168                          encoding_info->version?:"\b", encoding_flags);
3169
3170                 sbi->s_encoding = encoding;
3171                 sbi->s_encoding_flags = encoding_flags;
3172                 sbi->sb->s_d_op = &f2fs_dentry_ops;
3173         }
3174 #else
3175         if (f2fs_sb_has_casefold(sbi)) {
3176                 f2fs_err(sbi, "Filesystem with casefold feature cannot be mounted without CONFIG_UNICODE");
3177                 return -EINVAL;
3178         }
3179 #endif
3180         return 0;
3181 }
3182
3183 static void f2fs_tuning_parameters(struct f2fs_sb_info *sbi)
3184 {
3185         struct f2fs_sm_info *sm_i = SM_I(sbi);
3186
3187         /* adjust parameters according to the volume size */
3188         if (sm_i->main_segments <= SMALL_VOLUME_SEGMENTS) {
3189                 F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_REUSE;
3190                 sm_i->dcc_info->discard_granularity = 1;
3191                 sm_i->ipu_policy = 1 << F2FS_IPU_FORCE;
3192         }
3193
3194         sbi->readdir_ra = 1;
3195 }
3196
3197 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
3198 {
3199         struct f2fs_sb_info *sbi;
3200         struct f2fs_super_block *raw_super;
3201         struct inode *root;
3202         int err;
3203         bool skip_recovery = false, need_fsck = false;
3204         char *options = NULL;
3205         int recovery, i, valid_super_block;
3206         struct curseg_info *seg_i;
3207         int retry_cnt = 1;
3208
3209 try_onemore:
3210         err = -EINVAL;
3211         raw_super = NULL;
3212         valid_super_block = -1;
3213         recovery = 0;
3214
3215         /* allocate memory for f2fs-specific super block info */
3216         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
3217         if (!sbi)
3218                 return -ENOMEM;
3219
3220         sbi->sb = sb;
3221
3222         /* Load the checksum driver */
3223         sbi->s_chksum_driver = crypto_alloc_shash("crc32", 0, 0);
3224         if (IS_ERR(sbi->s_chksum_driver)) {
3225                 f2fs_err(sbi, "Cannot load crc32 driver.");
3226                 err = PTR_ERR(sbi->s_chksum_driver);
3227                 sbi->s_chksum_driver = NULL;
3228                 goto free_sbi;
3229         }
3230
3231         /* set a block size */
3232         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
3233                 f2fs_err(sbi, "unable to set blocksize");
3234                 goto free_sbi;
3235         }
3236
3237         err = read_raw_super_block(sbi, &raw_super, &valid_super_block,
3238                                                                 &recovery);
3239         if (err)
3240                 goto free_sbi;
3241
3242         sb->s_fs_info = sbi;
3243         sbi->raw_super = raw_super;
3244
3245         /* precompute checksum seed for metadata */
3246         if (f2fs_sb_has_inode_chksum(sbi))
3247                 sbi->s_chksum_seed = f2fs_chksum(sbi, ~0, raw_super->uuid,
3248                                                 sizeof(raw_super->uuid));
3249
3250         /*
3251          * The BLKZONED feature indicates that the drive was formatted with
3252          * zone alignment optimization. This is optional for host-aware
3253          * devices, but mandatory for host-managed zoned block devices.
3254          */
3255 #ifndef CONFIG_BLK_DEV_ZONED
3256         if (f2fs_sb_has_blkzoned(sbi)) {
3257                 f2fs_err(sbi, "Zoned block device support is not enabled");
3258                 err = -EOPNOTSUPP;
3259                 goto free_sb_buf;
3260         }
3261 #endif
3262         default_options(sbi);
3263         /* parse mount options */
3264         options = kstrdup((const char *)data, GFP_KERNEL);
3265         if (data && !options) {
3266                 err = -ENOMEM;
3267                 goto free_sb_buf;
3268         }
3269
3270         err = parse_options(sb, options);
3271         if (err)
3272                 goto free_options;
3273
3274         sbi->max_file_blocks = max_file_blocks();
3275         sb->s_maxbytes = sbi->max_file_blocks <<
3276                                 le32_to_cpu(raw_super->log_blocksize);
3277         sb->s_max_links = F2FS_LINK_MAX;
3278
3279         err = f2fs_setup_casefold(sbi);
3280         if (err)
3281                 goto free_options;
3282
3283 #ifdef CONFIG_QUOTA
3284         sb->dq_op = &f2fs_quota_operations;
3285         sb->s_qcop = &f2fs_quotactl_ops;
3286         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
3287
3288         if (f2fs_sb_has_quota_ino(sbi)) {
3289                 for (i = 0; i < MAXQUOTAS; i++) {
3290                         if (f2fs_qf_ino(sbi->sb, i))
3291                                 sbi->nquota_files++;
3292                 }
3293         }
3294 #endif
3295
3296         sb->s_op = &f2fs_sops;
3297 #ifdef CONFIG_FS_ENCRYPTION
3298         sb->s_cop = &f2fs_cryptops;
3299 #endif
3300 #ifdef CONFIG_FS_VERITY
3301         sb->s_vop = &f2fs_verityops;
3302 #endif
3303         sb->s_xattr = f2fs_xattr_handlers;
3304         sb->s_export_op = &f2fs_export_ops;
3305         sb->s_magic = F2FS_SUPER_MAGIC;
3306         sb->s_time_gran = 1;
3307         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3308                 (test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
3309         memcpy(&sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
3310         sb->s_iflags |= SB_I_CGROUPWB;
3311
3312         /* init f2fs-specific super block info */
3313         sbi->valid_super_block = valid_super_block;
3314         mutex_init(&sbi->gc_mutex);
3315         mutex_init(&sbi->writepages);
3316         mutex_init(&sbi->cp_mutex);
3317         mutex_init(&sbi->resize_mutex);
3318         init_rwsem(&sbi->node_write);
3319         init_rwsem(&sbi->node_change);
3320
3321         /* disallow all the data/node/meta page writes */
3322         set_sbi_flag(sbi, SBI_POR_DOING);
3323         spin_lock_init(&sbi->stat_lock);
3324
3325         /* init iostat info */
3326         spin_lock_init(&sbi->iostat_lock);
3327         sbi->iostat_enable = false;
3328
3329         for (i = 0; i < NR_PAGE_TYPE; i++) {
3330                 int n = (i == META) ? 1: NR_TEMP_TYPE;
3331                 int j;
3332
3333                 sbi->write_io[i] =
3334                         f2fs_kmalloc(sbi,
3335                                      array_size(n,
3336                                                 sizeof(struct f2fs_bio_info)),
3337                                      GFP_KERNEL);
3338                 if (!sbi->write_io[i]) {
3339                         err = -ENOMEM;
3340                         goto free_bio_info;
3341                 }
3342
3343                 for (j = HOT; j < n; j++) {
3344                         init_rwsem(&sbi->write_io[i][j].io_rwsem);
3345                         sbi->write_io[i][j].sbi = sbi;
3346                         sbi->write_io[i][j].bio = NULL;
3347                         spin_lock_init(&sbi->write_io[i][j].io_lock);
3348                         INIT_LIST_HEAD(&sbi->write_io[i][j].io_list);
3349                         INIT_LIST_HEAD(&sbi->write_io[i][j].bio_list);
3350                         init_rwsem(&sbi->write_io[i][j].bio_list_lock);
3351                 }
3352         }
3353
3354         init_rwsem(&sbi->cp_rwsem);
3355         init_rwsem(&sbi->quota_sem);
3356         init_waitqueue_head(&sbi->cp_wait);
3357         init_sb_info(sbi);
3358
3359         err = init_percpu_info(sbi);
3360         if (err)
3361                 goto free_bio_info;
3362
3363         if (F2FS_IO_ALIGNED(sbi)) {
3364                 sbi->write_io_dummy =
3365                         mempool_create_page_pool(2 * (F2FS_IO_SIZE(sbi) - 1), 0);
3366                 if (!sbi->write_io_dummy) {
3367                         err = -ENOMEM;
3368                         goto free_percpu;
3369                 }
3370         }
3371
3372         /* get an inode for meta space */
3373         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
3374         if (IS_ERR(sbi->meta_inode)) {
3375                 f2fs_err(sbi, "Failed to read F2FS meta data inode");
3376                 err = PTR_ERR(sbi->meta_inode);
3377                 goto free_io_dummy;
3378         }
3379
3380         err = f2fs_get_valid_checkpoint(sbi);
3381         if (err) {
3382                 f2fs_err(sbi, "Failed to get valid F2FS checkpoint");
3383                 goto free_meta_inode;
3384         }
3385
3386         if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_QUOTA_NEED_FSCK_FLAG))
3387                 set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
3388         if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_DISABLED_QUICK_FLAG)) {
3389                 set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
3390                 sbi->interval_time[DISABLE_TIME] = DEF_DISABLE_QUICK_INTERVAL;
3391         }
3392
3393         if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_FSCK_FLAG))
3394                 set_sbi_flag(sbi, SBI_NEED_FSCK);
3395
3396         /* Initialize device list */
3397         err = f2fs_scan_devices(sbi);
3398         if (err) {
3399                 f2fs_err(sbi, "Failed to find devices");
3400                 goto free_devices;
3401         }
3402
3403         sbi->total_valid_node_count =
3404                                 le32_to_cpu(sbi->ckpt->valid_node_count);
3405         percpu_counter_set(&sbi->total_valid_inode_count,
3406                                 le32_to_cpu(sbi->ckpt->valid_inode_count));
3407         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
3408         sbi->total_valid_block_count =
3409                                 le64_to_cpu(sbi->ckpt->valid_block_count);
3410         sbi->last_valid_block_count = sbi->total_valid_block_count;
3411         sbi->reserved_blocks = 0;
3412         sbi->current_reserved_blocks = 0;
3413         limit_reserve_root(sbi);
3414
3415         for (i = 0; i < NR_INODE_TYPE; i++) {
3416                 INIT_LIST_HEAD(&sbi->inode_list[i]);
3417                 spin_lock_init(&sbi->inode_lock[i]);
3418         }
3419         mutex_init(&sbi->flush_lock);
3420
3421         f2fs_init_extent_cache_info(sbi);
3422
3423         f2fs_init_ino_entry_info(sbi);
3424
3425         f2fs_init_fsync_node_info(sbi);
3426
3427         /* setup f2fs internal modules */
3428         err = f2fs_build_segment_manager(sbi);
3429         if (err) {
3430                 f2fs_err(sbi, "Failed to initialize F2FS segment manager (%d)",
3431                          err);
3432                 goto free_sm;
3433         }
3434         err = f2fs_build_node_manager(sbi);
3435         if (err) {
3436                 f2fs_err(sbi, "Failed to initialize F2FS node manager (%d)",
3437                          err);
3438                 goto free_nm;
3439         }
3440
3441         /* For write statistics */
3442         if (sb->s_bdev->bd_part)
3443                 sbi->sectors_written_start =
3444                         (u64)part_stat_read(sb->s_bdev->bd_part,
3445                                             sectors[STAT_WRITE]);
3446
3447         /* Read accumulated write IO statistics if exists */
3448         seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
3449         if (__exist_node_summaries(sbi))
3450                 sbi->kbytes_written =
3451                         le64_to_cpu(seg_i->journal->info.kbytes_written);
3452
3453         f2fs_build_gc_manager(sbi);
3454
3455         err = f2fs_build_stats(sbi);
3456         if (err)
3457                 goto free_nm;
3458
3459         /* get an inode for node space */
3460         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
3461         if (IS_ERR(sbi->node_inode)) {
3462                 f2fs_err(sbi, "Failed to read node inode");
3463                 err = PTR_ERR(sbi->node_inode);
3464                 goto free_stats;
3465         }
3466
3467         /* read root inode and dentry */
3468         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
3469         if (IS_ERR(root)) {
3470                 f2fs_err(sbi, "Failed to read root inode");
3471                 err = PTR_ERR(root);
3472                 goto free_node_inode;
3473         }
3474         if (!S_ISDIR(root->i_mode) || !root->i_blocks ||
3475                         !root->i_size || !root->i_nlink) {
3476                 iput(root);
3477                 err = -EINVAL;
3478                 goto free_node_inode;
3479         }
3480
3481         sb->s_root = d_make_root(root); /* allocate root dentry */
3482         if (!sb->s_root) {
3483                 err = -ENOMEM;
3484                 goto free_node_inode;
3485         }
3486
3487         err = f2fs_register_sysfs(sbi);
3488         if (err)
3489                 goto free_root_inode;
3490
3491 #ifdef CONFIG_QUOTA
3492         /* Enable quota usage during mount */
3493         if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sb)) {
3494                 err = f2fs_enable_quotas(sb);
3495                 if (err)
3496                         f2fs_err(sbi, "Cannot turn on quotas: error %d", err);
3497         }
3498 #endif
3499         /* if there are nt orphan nodes free them */
3500         err = f2fs_recover_orphan_inodes(sbi);
3501         if (err)
3502                 goto free_meta;
3503
3504         if (unlikely(is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)))
3505                 goto reset_checkpoint;
3506
3507         /* recover fsynced data */
3508         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
3509                 /*
3510                  * mount should be failed, when device has readonly mode, and
3511                  * previous checkpoint was not done by clean system shutdown.
3512                  */
3513                 if (f2fs_hw_is_readonly(sbi)) {
3514                         if (!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
3515                                 err = -EROFS;
3516                                 f2fs_err(sbi, "Need to recover fsync data, but write access unavailable");
3517                                 goto free_meta;
3518                         }
3519                         f2fs_info(sbi, "write access unavailable, skipping recovery");
3520                         goto reset_checkpoint;
3521                 }
3522
3523                 if (need_fsck)
3524                         set_sbi_flag(sbi, SBI_NEED_FSCK);
3525
3526                 if (skip_recovery)
3527                         goto reset_checkpoint;
3528
3529                 err = f2fs_recover_fsync_data(sbi, false);
3530                 if (err < 0) {
3531                         if (err != -ENOMEM)
3532                                 skip_recovery = true;
3533                         need_fsck = true;
3534                         f2fs_err(sbi, "Cannot recover all fsync data errno=%d",
3535                                  err);
3536                         goto free_meta;
3537                 }
3538         } else {
3539                 err = f2fs_recover_fsync_data(sbi, true);
3540
3541                 if (!f2fs_readonly(sb) && err > 0) {
3542                         err = -EINVAL;
3543                         f2fs_err(sbi, "Need to recover fsync data");
3544                         goto free_meta;
3545                 }
3546         }
3547 reset_checkpoint:
3548         /* f2fs_recover_fsync_data() cleared this already */
3549         clear_sbi_flag(sbi, SBI_POR_DOING);
3550
3551         if (test_opt(sbi, DISABLE_CHECKPOINT)) {
3552                 err = f2fs_disable_checkpoint(sbi);
3553                 if (err)
3554                         goto sync_free_meta;
3555         } else if (is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)) {
3556                 f2fs_enable_checkpoint(sbi);
3557         }
3558
3559         /*
3560          * If filesystem is not mounted as read-only then
3561          * do start the gc_thread.
3562          */
3563         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
3564                 /* After POR, we can run background GC thread.*/
3565                 err = f2fs_start_gc_thread(sbi);
3566                 if (err)
3567                         goto sync_free_meta;
3568         }
3569         kvfree(options);
3570
3571         /* recover broken superblock */
3572         if (recovery) {
3573                 err = f2fs_commit_super(sbi, true);
3574                 f2fs_info(sbi, "Try to recover %dth superblock, ret: %d",
3575                           sbi->valid_super_block ? 1 : 2, err);
3576         }
3577
3578         f2fs_join_shrinker(sbi);
3579
3580         f2fs_tuning_parameters(sbi);
3581
3582         f2fs_notice(sbi, "Mounted with checkpoint version = %llx",
3583                     cur_cp_version(F2FS_CKPT(sbi)));
3584         f2fs_update_time(sbi, CP_TIME);
3585         f2fs_update_time(sbi, REQ_TIME);
3586         clear_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
3587         return 0;
3588
3589 sync_free_meta:
3590         /* safe to flush all the data */
3591         sync_filesystem(sbi->sb);
3592         retry_cnt = 0;
3593
3594 free_meta:
3595 #ifdef CONFIG_QUOTA
3596         f2fs_truncate_quota_inode_pages(sb);
3597         if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sb))
3598                 f2fs_quota_off_umount(sbi->sb);
3599 #endif
3600         /*
3601          * Some dirty meta pages can be produced by f2fs_recover_orphan_inodes()
3602          * failed by EIO. Then, iput(node_inode) can trigger balance_fs_bg()
3603          * followed by f2fs_write_checkpoint() through f2fs_write_node_pages(), which
3604          * falls into an infinite loop in f2fs_sync_meta_pages().
3605          */
3606         truncate_inode_pages_final(META_MAPPING(sbi));
3607         /* evict some inodes being cached by GC */
3608         evict_inodes(sb);
3609         f2fs_unregister_sysfs(sbi);
3610 free_root_inode:
3611         dput(sb->s_root);
3612         sb->s_root = NULL;
3613 free_node_inode:
3614         f2fs_release_ino_entry(sbi, true);
3615         truncate_inode_pages_final(NODE_MAPPING(sbi));
3616         iput(sbi->node_inode);
3617         sbi->node_inode = NULL;
3618 free_stats:
3619         f2fs_destroy_stats(sbi);
3620 free_nm:
3621         f2fs_destroy_node_manager(sbi);
3622 free_sm:
3623         f2fs_destroy_segment_manager(sbi);
3624 free_devices:
3625         destroy_device_list(sbi);
3626         kvfree(sbi->ckpt);
3627 free_meta_inode:
3628         make_bad_inode(sbi->meta_inode);
3629         iput(sbi->meta_inode);
3630         sbi->meta_inode = NULL;
3631 free_io_dummy:
3632         mempool_destroy(sbi->write_io_dummy);
3633 free_percpu:
3634         destroy_percpu_info(sbi);
3635 free_bio_info:
3636         for (i = 0; i < NR_PAGE_TYPE; i++)
3637                 kvfree(sbi->write_io[i]);
3638
3639 #ifdef CONFIG_UNICODE
3640         utf8_unload(sbi->s_encoding);
3641 #endif
3642 free_options:
3643 #ifdef CONFIG_QUOTA
3644         for (i = 0; i < MAXQUOTAS; i++)
3645                 kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
3646 #endif
3647         kvfree(options);
3648 free_sb_buf:
3649         kvfree(raw_super);
3650 free_sbi:
3651         if (sbi->s_chksum_driver)
3652                 crypto_free_shash(sbi->s_chksum_driver);
3653         kvfree(sbi);
3654
3655         /* give only one another chance */
3656         if (retry_cnt > 0 && skip_recovery) {
3657                 retry_cnt--;
3658                 shrink_dcache_sb(sb);
3659                 goto try_onemore;
3660         }
3661         return err;
3662 }
3663
3664 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
3665                         const char *dev_name, void *data)
3666 {
3667         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
3668 }
3669
3670 static void kill_f2fs_super(struct super_block *sb)
3671 {
3672         if (sb->s_root) {
3673                 struct f2fs_sb_info *sbi = F2FS_SB(sb);
3674
3675                 set_sbi_flag(sbi, SBI_IS_CLOSE);
3676                 f2fs_stop_gc_thread(sbi);
3677                 f2fs_stop_discard_thread(sbi);
3678
3679                 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
3680                                 !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
3681                         struct cp_control cpc = {
3682                                 .reason = CP_UMOUNT,
3683                         };
3684                         f2fs_write_checkpoint(sbi, &cpc);
3685                 }
3686
3687                 if (is_sbi_flag_set(sbi, SBI_IS_RECOVERED) && f2fs_readonly(sb))
3688                         sb->s_flags &= ~SB_RDONLY;
3689         }
3690         kill_block_super(sb);
3691 }
3692
3693 static struct file_system_type f2fs_fs_type = {
3694         .owner          = THIS_MODULE,
3695         .name           = "f2fs",
3696         .mount          = f2fs_mount,
3697         .kill_sb        = kill_f2fs_super,
3698         .fs_flags       = FS_REQUIRES_DEV,
3699 };
3700 MODULE_ALIAS_FS("f2fs");
3701
3702 static int __init init_inodecache(void)
3703 {
3704         f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache",
3705                         sizeof(struct f2fs_inode_info), 0,
3706                         SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL);
3707         if (!f2fs_inode_cachep)
3708                 return -ENOMEM;
3709         return 0;
3710 }
3711
3712 static void destroy_inodecache(void)
3713 {
3714         /*
3715          * Make sure all delayed rcu free inodes are flushed before we
3716          * destroy cache.
3717          */
3718         rcu_barrier();
3719         kmem_cache_destroy(f2fs_inode_cachep);
3720 }
3721
3722 static int __init init_f2fs_fs(void)
3723 {
3724         int err;
3725
3726         if (PAGE_SIZE != F2FS_BLKSIZE) {
3727                 printk("F2FS not supported on PAGE_SIZE(%lu) != %d\n",
3728                                 PAGE_SIZE, F2FS_BLKSIZE);
3729                 return -EINVAL;
3730         }
3731
3732         f2fs_build_trace_ios();
3733
3734         err = init_inodecache();
3735         if (err)
3736                 goto fail;
3737         err = f2fs_create_node_manager_caches();
3738         if (err)
3739                 goto free_inodecache;
3740         err = f2fs_create_segment_manager_caches();
3741         if (err)
3742                 goto free_node_manager_caches;
3743         err = f2fs_create_checkpoint_caches();
3744         if (err)
3745                 goto free_segment_manager_caches;
3746         err = f2fs_create_extent_cache();
3747         if (err)
3748                 goto free_checkpoint_caches;
3749         err = f2fs_init_sysfs();
3750         if (err)
3751                 goto free_extent_cache;
3752         err = register_shrinker(&f2fs_shrinker_info);
3753         if (err)
3754                 goto free_sysfs;
3755         err = register_filesystem(&f2fs_fs_type);
3756         if (err)
3757                 goto free_shrinker;
3758         f2fs_create_root_stats();
3759         err = f2fs_init_post_read_processing();
3760         if (err)
3761                 goto free_root_stats;
3762         err = f2fs_init_bio_entry_cache();
3763         if (err)
3764                 goto free_post_read;
3765         return 0;
3766
3767 free_post_read:
3768         f2fs_destroy_post_read_processing();
3769 free_root_stats:
3770         f2fs_destroy_root_stats();
3771         unregister_filesystem(&f2fs_fs_type);
3772 free_shrinker:
3773         unregister_shrinker(&f2fs_shrinker_info);
3774 free_sysfs:
3775         f2fs_exit_sysfs();
3776 free_extent_cache:
3777         f2fs_destroy_extent_cache();
3778 free_checkpoint_caches:
3779         f2fs_destroy_checkpoint_caches();
3780 free_segment_manager_caches:
3781         f2fs_destroy_segment_manager_caches();
3782 free_node_manager_caches:
3783         f2fs_destroy_node_manager_caches();
3784 free_inodecache:
3785         destroy_inodecache();
3786 fail:
3787         return err;
3788 }
3789
3790 static void __exit exit_f2fs_fs(void)
3791 {
3792         f2fs_destroy_bio_entry_cache();
3793         f2fs_destroy_post_read_processing();
3794         f2fs_destroy_root_stats();
3795         unregister_filesystem(&f2fs_fs_type);
3796         unregister_shrinker(&f2fs_shrinker_info);
3797         f2fs_exit_sysfs();
3798         f2fs_destroy_extent_cache();
3799         f2fs_destroy_checkpoint_caches();
3800         f2fs_destroy_segment_manager_caches();
3801         f2fs_destroy_node_manager_caches();
3802         destroy_inodecache();
3803         f2fs_destroy_trace_ios();
3804 }
3805
3806 module_init(init_f2fs_fs)
3807 module_exit(exit_f2fs_fs)
3808
3809 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
3810 MODULE_DESCRIPTION("Flash Friendly File System");
3811 MODULE_LICENSE("GPL");
3812