text: // SPDX-License-Identifier: GPL-2.0
  /*
   * fs/f2fs/super.c
   *
   * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   *             http://www.samsung.com/
   */
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/fs.h>
  #include <linux/statfs.h>
  #include <linux/buffer_head.h>
  #include <linux/backing-dev.h>
  #include <linux/kthread.h>
  #include <linux/parser.h>
  #include <linux/mount.h>
  #include <linux/seq_file.h>
  #include <linux/proc_fs.h>
  #include <linux/random.h>
  #include <linux/exportfs.h>
  #include <linux/blkdev.h>
  #include <linux/quotaops.h>
  #include <linux/f2fs_fs.h>
  #include <linux/sysfs.h>
  #include <linux/quota.h>
  
  #include "f2fs.h"
  #include "node.h"
  #include "segment.h"
  #include "xattr.h"
  #include "gc.h"
  #include "trace.h"
  
  #define CREATE_TRACE_POINTS
  #include <trace/events/f2fs.h>
  
  static struct kmem_cache *f2fs_inode_cachep;
  
  #ifdef CONFIG_F2FS_FAULT_INJECTION
  
  const char *f2fs_fault_name[FAULT_MAX] = {
  	[FAULT_KMALLOC]		= "kmalloc",
  	[FAULT_KVMALLOC]	= "kvmalloc",
  	[FAULT_PAGE_ALLOC]	= "page alloc",
  	[FAULT_PAGE_GET]	= "page get",
  	[FAULT_ALLOC_BIO]	= "alloc bio",
  	[FAULT_ALLOC_NID]	= "alloc nid",
  	[FAULT_ORPHAN]		= "orphan",
  	[FAULT_BLOCK]		= "no more block",
  	[FAULT_DIR_DEPTH]	= "too big dir depth",
  	[FAULT_EVICT_INODE]	= "evict_inode fail",
  	[FAULT_TRUNCATE]	= "truncate fail",
  	[FAULT_READ_IO]		= "read IO error",
  	[FAULT_CHECKPOINT]	= "checkpoint error",
  	[FAULT_DISCARD]		= "discard error",
  	[FAULT_WRITE_IO]	= "write IO error",
  };
  
  void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,
  							unsigned int type)
  {
  	struct f2fs_fault_info *ffi = &F2FS_OPTION(sbi).fault_info;
  
  	if (rate) {
  		atomic_set(&ffi->inject_ops, 0);
  		ffi->inject_rate = rate;
  	}
  
  	if (type)
  		ffi->inject_type = type;
  
  	if (!rate && !type)
  		memset(ffi, 0, sizeof(struct f2fs_fault_info));
  }
  #endif
  
  /* f2fs-wide shrinker description */
  static struct shrinker f2fs_shrinker_info = {
  	.scan_objects = f2fs_shrink_scan,
  	.count_objects = f2fs_shrink_count,
  	.seeks = DEFAULT_SEEKS,
  };
  
  enum {
  	Opt_gc_background,
  	Opt_disable_roll_forward,
  	Opt_norecovery,
  	Opt_discard,
  	Opt_nodiscard,
  	Opt_noheap,
  	Opt_heap,
  	Opt_user_xattr,
  	Opt_nouser_xattr,
  	Opt_acl,
  	Opt_noacl,
  	Opt_active_logs,
  	Opt_disable_ext_identify,
  	Opt_inline_xattr,
  	Opt_noinline_xattr,
  	Opt_inline_xattr_size,
  	Opt_inline_data,
  	Opt_inline_dentry,
  	Opt_noinline_dentry,
  	Opt_flush_merge,
  	Opt_noflush_merge,
  	Opt_nobarrier,
  	Opt_fastboot,
  	Opt_extent_cache,
  	Opt_noextent_cache,
  	Opt_noinline_data,
  	Opt_data_flush,
  	Opt_reserve_root,
  	Opt_resgid,
  	Opt_resuid,
  	Opt_mode,
  	Opt_io_size_bits,
  	Opt_fault_injection,
  	Opt_fault_type,
  	Opt_lazytime,
  	Opt_nolazytime,
  	Opt_quota,
  	Opt_noquota,
  	Opt_usrquota,
  	Opt_grpquota,
  	Opt_prjquota,
  	Opt_usrjquota,
  	Opt_grpjquota,
  	Opt_prjjquota,
  	Opt_offusrjquota,
  	Opt_offgrpjquota,
  	Opt_offprjjquota,
  	Opt_jqfmt_vfsold,
  	Opt_jqfmt_vfsv0,
  	Opt_jqfmt_vfsv1,
  	Opt_whint,
  	Opt_alloc,
  	Opt_fsync,
  	Opt_test_dummy_encryption,
  	Opt_checkpoint_disable,
  	Opt_checkpoint_disable_cap,
  	Opt_checkpoint_disable_cap_perc,
  	Opt_checkpoint_enable,
  	Opt_err,
  };
  
  static match_table_t f2fs_tokens = {
  	{Opt_gc_background, "background_gc=%s"},
  	{Opt_disable_roll_forward, "disable_roll_forward"},
  	{Opt_norecovery, "norecovery"},
  	{Opt_discard, "discard"},
  	{Opt_nodiscard, "nodiscard"},
  	{Opt_noheap, "no_heap"},
  	{Opt_heap, "heap"},
  	{Opt_user_xattr, "user_xattr"},
  	{Opt_nouser_xattr, "nouser_xattr"},
  	{Opt_acl, "acl"},
  	{Opt_noacl, "noacl"},
  	{Opt_active_logs, "active_logs=%u"},
  	{Opt_disable_ext_identify, "disable_ext_identify"},
  	{Opt_inline_xattr, "inline_xattr"},
  	{Opt_noinline_xattr, "noinline_xattr"},
  	{Opt_inline_xattr_size, "inline_xattr_size=%u"},
  	{Opt_inline_data, "inline_data"},
  	{Opt_inline_dentry, "inline_dentry"},
  	{Opt_noinline_dentry, "noinline_dentry"},
  	{Opt_flush_merge, "flush_merge"},
  	{Opt_noflush_merge, "noflush_merge"},
  	{Opt_nobarrier, "nobarrier"},
  	{Opt_fastboot, "fastboot"},
  	{Opt_extent_cache, "extent_cache"},
  	{Opt_noextent_cache, "noextent_cache"},
  	{Opt_noinline_data, "noinline_data"},
  	{Opt_data_flush, "data_flush"},
  	{Opt_reserve_root, "reserve_root=%u"},
  	{Opt_resgid, "resgid=%u"},
  	{Opt_resuid, "resuid=%u"},
  	{Opt_mode, "mode=%s"},
  	{Opt_io_size_bits, "io_bits=%u"},
  	{Opt_fault_injection, "fault_injection=%u"},
  	{Opt_fault_type, "fault_type=%u"},
  	{Opt_lazytime, "lazytime"},
  	{Opt_nolazytime, "nolazytime"},
  	{Opt_quota, "quota"},
  	{Opt_noquota, "noquota"},
  	{Opt_usrquota, "usrquota"},
  	{Opt_grpquota, "grpquota"},
  	{Opt_prjquota, "prjquota"},
  	{Opt_usrjquota, "usrjquota=%s"},
  	{Opt_grpjquota, "grpjquota=%s"},
  	{Opt_prjjquota, "prjjquota=%s"},
  	{Opt_offusrjquota, "usrjquota="},
  	{Opt_offgrpjquota, "grpjquota="},
  	{Opt_offprjjquota, "prjjquota="},
  	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
  	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
  	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
  	{Opt_whint, "whint_mode=%s"},
  	{Opt_alloc, "alloc_mode=%s"},
  	{Opt_fsync, "fsync_mode=%s"},
  	{Opt_test_dummy_encryption, "test_dummy_encryption"},
  	{Opt_checkpoint_disable, "checkpoint=disable"},
  	{Opt_checkpoint_disable_cap, "checkpoint=disable:%u"},
  	{Opt_checkpoint_disable_cap_perc, "checkpoint=disable:%u%%"},
  	{Opt_checkpoint_enable, "checkpoint=enable"},
  	{Opt_err, NULL},
  };
  
  void f2fs_printk(struct f2fs_sb_info *sbi, const char *fmt, ...)
  {
  	struct va_format vaf;
  	va_list args;
  	int level;
  
  	va_start(args, fmt);
  
  	level = printk_get_level(fmt);
  	vaf.fmt = printk_skip_level(fmt);
  	vaf.va = &args;
  	printk("%c%cF2FS-fs (%s): %pV\n",
  	       KERN_SOH_ASCII, level, sbi->sb->s_id, &vaf);
  
  	va_end(args);
  }
  
  static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
  {
  	block_t limit = min((sbi->user_block_count << 1) / 1000,
  			sbi->user_block_count - sbi->reserved_blocks);
  
  	/* limit is 0.2% */
  	if (test_opt(sbi, RESERVE_ROOT) &&
  			F2FS_OPTION(sbi).root_reserved_blocks > limit) {
  		F2FS_OPTION(sbi).root_reserved_blocks = limit;
  		f2fs_info(sbi, "Reduce reserved blocks for root = %u",
  			  F2FS_OPTION(sbi).root_reserved_blocks);
  	}
  	if (!test_opt(sbi, RESERVE_ROOT) &&
  		(!uid_eq(F2FS_OPTION(sbi).s_resuid,
  				make_kuid(&init_user_ns, F2FS_DEF_RESUID)) ||
  		!gid_eq(F2FS_OPTION(sbi).s_resgid,
  				make_kgid(&init_user_ns, F2FS_DEF_RESGID))))
  		f2fs_info(sbi, "Ignore s_resuid=%u, s_resgid=%u w/o reserve_root",
  			  from_kuid_munged(&init_user_ns,
  					   F2FS_OPTION(sbi).s_resuid),
  			  from_kgid_munged(&init_user_ns,
  					   F2FS_OPTION(sbi).s_resgid));
  }
  
  static void init_once(void *foo)
  {
  	struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
  
  	inode_init_once(&fi->vfs_inode);
  }
  
  #ifdef CONFIG_QUOTA
  static const char * const quotatypes[] = INITQFNAMES;
  #define QTYPE2NAME(t) (quotatypes[t])
  static int f2fs_set_qf_name(struct super_block *sb, int qtype,
  							substring_t *args)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	char *qname;
  	int ret = -EINVAL;
  
  	if (sb_any_quota_loaded(sb) && !F2FS_OPTION(sbi).s_qf_names[qtype]) {
  		f2fs_err(sbi, "Cannot change journaled quota options when quota turned on");
  		return -EINVAL;
  	}
  	if (f2fs_sb_has_quota_ino(sbi)) {
  		f2fs_info(sbi, "QUOTA feature is enabled, so ignore qf_name");
  		return 0;
  	}
  
  	qname = match_strdup(args);
  	if (!qname) {
  		f2fs_err(sbi, "Not enough memory for storing quotafile name");
  		return -ENOMEM;
  	}
  	if (F2FS_OPTION(sbi).s_qf_names[qtype]) {
  		if (strcmp(F2FS_OPTION(sbi).s_qf_names[qtype], qname) == 0)
  			ret = 0;
  		else
  			f2fs_err(sbi, "%s quota file already specified",
  				 QTYPE2NAME(qtype));
  		goto errout;
  	}
  	if (strchr(qname, '/')) {
  		f2fs_err(sbi, "quotafile must be on filesystem root");
  		goto errout;
  	}
  	F2FS_OPTION(sbi).s_qf_names[qtype] = qname;
  	set_opt(sbi, QUOTA);
  	return 0;
  errout:
  	kvfree(qname);
  	return ret;
  }
  
  static int f2fs_clear_qf_name(struct super_block *sb, int qtype)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  
  	if (sb_any_quota_loaded(sb) && F2FS_OPTION(sbi).s_qf_names[qtype]) {
  		f2fs_err(sbi, "Cannot change journaled quota options when quota turned on");
  		return -EINVAL;
  	}
  	kvfree(F2FS_OPTION(sbi).s_qf_names[qtype]);
  	F2FS_OPTION(sbi).s_qf_names[qtype] = NULL;
  	return 0;
  }
  
  static int f2fs_check_quota_options(struct f2fs_sb_info *sbi)
  {
  	/*
  	 * We do the test below only for project quotas. 'usrquota' and
  	 * 'grpquota' mount options are allowed even without quota feature
  	 * to support legacy quotas in quota files.
  	 */
  	if (test_opt(sbi, PRJQUOTA) && !f2fs_sb_has_project_quota(sbi)) {
  		f2fs_err(sbi, "Project quota feature not enabled. Cannot enable project quota enforcement.");
  		return -1;
  	}
  	if (F2FS_OPTION(sbi).s_qf_names[USRQUOTA] ||
  			F2FS_OPTION(sbi).s_qf_names[GRPQUOTA] ||
  			F2FS_OPTION(sbi).s_qf_names[PRJQUOTA]) {
  		if (test_opt(sbi, USRQUOTA) &&
  				F2FS_OPTION(sbi).s_qf_names[USRQUOTA])
  			clear_opt(sbi, USRQUOTA);
  
  		if (test_opt(sbi, GRPQUOTA) &&
  				F2FS_OPTION(sbi).s_qf_names[GRPQUOTA])
  			clear_opt(sbi, GRPQUOTA);
  
  		if (test_opt(sbi, PRJQUOTA) &&
  				F2FS_OPTION(sbi).s_qf_names[PRJQUOTA])
  			clear_opt(sbi, PRJQUOTA);
  
  		if (test_opt(sbi, GRPQUOTA) || test_opt(sbi, USRQUOTA) ||
  				test_opt(sbi, PRJQUOTA)) {
  			f2fs_err(sbi, "old and new quota format mixing");
  			return -1;
  		}
  
  		if (!F2FS_OPTION(sbi).s_jquota_fmt) {
  			f2fs_err(sbi, "journaled quota format not specified");
  			return -1;
  		}
  	}
  
  	if (f2fs_sb_has_quota_ino(sbi) && F2FS_OPTION(sbi).s_jquota_fmt) {
  		f2fs_info(sbi, "QUOTA feature is enabled, so ignore jquota_fmt");
  		F2FS_OPTION(sbi).s_jquota_fmt = 0;
  	}
  	return 0;
  }
  #endif
  
  static int parse_options(struct super_block *sb, char *options)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	substring_t args[MAX_OPT_ARGS];
  	char *p, *name;
  	int arg = 0;
  	kuid_t uid;
  	kgid_t gid;
  #ifdef CONFIG_QUOTA
  	int ret;
  #endif
  
  	if (!options)
  		return 0;
  
  	while ((p = strsep(&options, ",")) != NULL) {
  		int token;
  		if (!*p)
  			continue;
  		/*
  		 * Initialize args struct so we know whether arg was
  		 * found; some options take optional arguments.
  		 */
  		args[0].to = args[0].from = NULL;
  		token = match_token(p, f2fs_tokens, args);
  
  		switch (token) {
  		case Opt_gc_background:
  			name = match_strdup(&args[0]);
  
  			if (!name)
  				return -ENOMEM;
  			if (strlen(name) == 2 && !strncmp(name, "on", 2)) {
  				set_opt(sbi, BG_GC);
  				clear_opt(sbi, FORCE_FG_GC);
  			} else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {
  				clear_opt(sbi, BG_GC);
  				clear_opt(sbi, FORCE_FG_GC);
  			} else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {
  				set_opt(sbi, BG_GC);
  				set_opt(sbi, FORCE_FG_GC);
  			} else {
  				kvfree(name);
  				return -EINVAL;
  			}
  			kvfree(name);
  			break;
  		case Opt_disable_roll_forward:
  			set_opt(sbi, DISABLE_ROLL_FORWARD);
  			break;
  		case Opt_norecovery:
  			/* this option mounts f2fs with ro */
  			set_opt(sbi, DISABLE_ROLL_FORWARD);
  			if (!f2fs_readonly(sb))
  				return -EINVAL;
  			break;
  		case Opt_discard:
  			set_opt(sbi, DISCARD);
  			break;
  		case Opt_nodiscard:
  			if (f2fs_sb_has_blkzoned(sbi)) {
  				f2fs_warn(sbi, "discard is required for zoned block devices");
  				return -EINVAL;
  			}
  			clear_opt(sbi, DISCARD);
  			break;
  		case Opt_noheap:
  			set_opt(sbi, NOHEAP);
  			break;
  		case Opt_heap:
  			clear_opt(sbi, NOHEAP);
  			break;
  #ifdef CONFIG_F2FS_FS_XATTR
  		case Opt_user_xattr:
  			set_opt(sbi, XATTR_USER);
  			break;
  		case Opt_nouser_xattr:
  			clear_opt(sbi, XATTR_USER);
  			break;
  		case Opt_inline_xattr:
  			set_opt(sbi, INLINE_XATTR);
  			break;
  		case Opt_noinline_xattr:
  			clear_opt(sbi, INLINE_XATTR);
  			break;
  		case Opt_inline_xattr_size:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			set_opt(sbi, INLINE_XATTR_SIZE);
  			F2FS_OPTION(sbi).inline_xattr_size = arg;
  			break;
  #else
  		case Opt_user_xattr:
  			f2fs_info(sbi, "user_xattr options not supported");
  			break;
  		case Opt_nouser_xattr:
  			f2fs_info(sbi, "nouser_xattr options not supported");
  			break;
  		case Opt_inline_xattr:
  			f2fs_info(sbi, "inline_xattr options not supported");
  			break;
  		case Opt_noinline_xattr:
  			f2fs_info(sbi, "noinline_xattr options not supported");
  			break;
  #endif
  #ifdef CONFIG_F2FS_FS_POSIX_ACL
  		case Opt_acl:
  			set_opt(sbi, POSIX_ACL);
  			break;
  		case Opt_noacl:
  			clear_opt(sbi, POSIX_ACL);
  			break;
  #else
  		case Opt_acl:
  			f2fs_info(sbi, "acl options not supported");
  			break;
  		case Opt_noacl:
  			f2fs_info(sbi, "noacl options not supported");
  			break;
  #endif
  		case Opt_active_logs:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
  				return -EINVAL;
  			F2FS_OPTION(sbi).active_logs = arg;
  			break;
  		case Opt_disable_ext_identify:
  			set_opt(sbi, DISABLE_EXT_IDENTIFY);
  			break;
  		case Opt_inline_data:
  			set_opt(sbi, INLINE_DATA);
  			break;
  		case Opt_inline_dentry:
  			set_opt(sbi, INLINE_DENTRY);
  			break;
  		case Opt_noinline_dentry:
  			clear_opt(sbi, INLINE_DENTRY);
  			break;
  		case Opt_flush_merge:
  			set_opt(sbi, FLUSH_MERGE);
  			break;
  		case Opt_noflush_merge:
  			clear_opt(sbi, FLUSH_MERGE);
  			break;
  		case Opt_nobarrier:
  			set_opt(sbi, NOBARRIER);
  			break;
  		case Opt_fastboot:
  			set_opt(sbi, FASTBOOT);
  			break;
  		case Opt_extent_cache:
  			set_opt(sbi, EXTENT_CACHE);
  			break;
  		case Opt_noextent_cache:
  			clear_opt(sbi, EXTENT_CACHE);
  			break;
  		case Opt_noinline_data:
  			clear_opt(sbi, INLINE_DATA);
  			break;
  		case Opt_data_flush:
  			set_opt(sbi, DATA_FLUSH);
  			break;
  		case Opt_reserve_root:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			if (test_opt(sbi, RESERVE_ROOT)) {
  				f2fs_info(sbi, "Preserve previous reserve_root=%u",
  					  F2FS_OPTION(sbi).root_reserved_blocks);
  			} else {
  				F2FS_OPTION(sbi).root_reserved_blocks = arg;
  				set_opt(sbi, RESERVE_ROOT);
  			}
  			break;
  		case Opt_resuid:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			uid = make_kuid(current_user_ns(), arg);
  			if (!uid_valid(uid)) {
  				f2fs_err(sbi, "Invalid uid value %d", arg);
  				return -EINVAL;
  			}
  			F2FS_OPTION(sbi).s_resuid = uid;
  			break;
  		case Opt_resgid:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			gid = make_kgid(current_user_ns(), arg);
  			if (!gid_valid(gid)) {
  				f2fs_err(sbi, "Invalid gid value %d", arg);
  				return -EINVAL;
  			}
  			F2FS_OPTION(sbi).s_resgid = gid;
  			break;
  		case Opt_mode:
  			name = match_strdup(&args[0]);
  
  			if (!name)
  				return -ENOMEM;
  			if (strlen(name) == 8 &&
  					!strncmp(name, "adaptive", 8)) {
  				if (f2fs_sb_has_blkzoned(sbi)) {
  					f2fs_warn(sbi, "adaptive mode is not allowed with zoned block device feature");
  					kvfree(name);
  					return -EINVAL;
  				}
  				set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
  			} else if (strlen(name) == 3 &&
  					!strncmp(name, "lfs", 3)) {
  				set_opt_mode(sbi, F2FS_MOUNT_LFS);
  			} else {
  				kvfree(name);
  				return -EINVAL;
  			}
  			kvfree(name);
  			break;
  		case Opt_io_size_bits:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			if (arg <= 0 || arg > __ilog2_u32(BIO_MAX_PAGES)) {
  				f2fs_warn(sbi, "Not support %d, larger than %d",
  					  1 << arg, BIO_MAX_PAGES);
  				return -EINVAL;
  			}
  			F2FS_OPTION(sbi).write_io_size_bits = arg;
  			break;
  #ifdef CONFIG_F2FS_FAULT_INJECTION
  		case Opt_fault_injection:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			f2fs_build_fault_attr(sbi, arg, F2FS_ALL_FAULT_TYPE);
  			set_opt(sbi, FAULT_INJECTION);
  			break;
  
  		case Opt_fault_type:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			f2fs_build_fault_attr(sbi, 0, arg);
  			set_opt(sbi, FAULT_INJECTION);
  			break;
  #else
  		case Opt_fault_injection:
  			f2fs_info(sbi, "fault_injection options not supported");
  			break;
  
  		case Opt_fault_type:
  			f2fs_info(sbi, "fault_type options not supported");
  			break;
  #endif
  		case Opt_lazytime:
  			sb->s_flags |= MS_LAZYTIME;
  			break;
  		case Opt_nolazytime:
  			sb->s_flags &= ~MS_LAZYTIME;
  			break;
  #ifdef CONFIG_QUOTA
  		case Opt_quota:
  		case Opt_usrquota:
  			set_opt(sbi, USRQUOTA);
  			break;
  		case Opt_grpquota:
  			set_opt(sbi, GRPQUOTA);
  			break;
  		case Opt_prjquota:
  			set_opt(sbi, PRJQUOTA);
  			break;
  		case Opt_usrjquota:
  			ret = f2fs_set_qf_name(sb, USRQUOTA, &args[0]);
  			if (ret)
  				return ret;
  			break;
  		case Opt_grpjquota:
  			ret = f2fs_set_qf_name(sb, GRPQUOTA, &args[0]);
  			if (ret)
  				return ret;
  			break;
  		case Opt_prjjquota:
  			ret = f2fs_set_qf_name(sb, PRJQUOTA, &args[0]);
  			if (ret)
  				return ret;
  			break;
  		case Opt_offusrjquota:
  			ret = f2fs_clear_qf_name(sb, USRQUOTA);
  			if (ret)
  				return ret;
  			break;
  		case Opt_offgrpjquota:
  			ret = f2fs_clear_qf_name(sb, GRPQUOTA);
  			if (ret)
  				return ret;
  			break;
  		case Opt_offprjjquota:
  			ret = f2fs_clear_qf_name(sb, PRJQUOTA);
  			if (ret)
  				return ret;
  			break;
  		case Opt_jqfmt_vfsold:
  			F2FS_OPTION(sbi).s_jquota_fmt = QFMT_VFS_OLD;
  			break;
  		case Opt_jqfmt_vfsv0:
  			F2FS_OPTION(sbi).s_jquota_fmt = QFMT_VFS_V0;
  			break;
  		case Opt_jqfmt_vfsv1:
  			F2FS_OPTION(sbi).s_jquota_fmt = QFMT_VFS_V1;
  			break;
  		case Opt_noquota:
  			clear_opt(sbi, QUOTA);
  			clear_opt(sbi, USRQUOTA);
  			clear_opt(sbi, GRPQUOTA);
  			clear_opt(sbi, PRJQUOTA);
  			break;
  #else
  		case Opt_quota:
  		case Opt_usrquota:
  		case Opt_grpquota:
  		case Opt_prjquota:
  		case Opt_usrjquota:
  		case Opt_grpjquota:
  		case Opt_prjjquota:
  		case Opt_offusrjquota:
  		case Opt_offgrpjquota:
  		case Opt_offprjjquota:
  		case Opt_jqfmt_vfsold:
  		case Opt_jqfmt_vfsv0:
  		case Opt_jqfmt_vfsv1:
  		case Opt_noquota:
  			f2fs_info(sbi, "quota operations not supported");
  			break;
  #endif
  		case Opt_whint:
  			name = match_strdup(&args[0]);
  			if (!name)
  				return -ENOMEM;
  			if (strlen(name) == 10 &&
  					!strncmp(name, "user-based", 10)) {
  				F2FS_OPTION(sbi).whint_mode = WHINT_MODE_USER;
  			} else if (strlen(name) == 3 &&
  					!strncmp(name, "off", 3)) {
  				F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
  			} else if (strlen(name) == 8 &&
  					!strncmp(name, "fs-based", 8)) {
  				F2FS_OPTION(sbi).whint_mode = WHINT_MODE_FS;
  			} else {
  				kvfree(name);
  				return -EINVAL;
  			}
  			kvfree(name);
  			break;
  		case Opt_alloc:
  			name = match_strdup(&args[0]);
  			if (!name)
  				return -ENOMEM;
  
  			if (strlen(name) == 7 &&
  					!strncmp(name, "default", 7)) {
  				F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
  			} else if (strlen(name) == 5 &&
  					!strncmp(name, "reuse", 5)) {
  				F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_REUSE;
  			} else {
  				kvfree(name);
  				return -EINVAL;
  			}
  			kvfree(name);
  			break;
  		case Opt_fsync:
  			name = match_strdup(&args[0]);
  			if (!name)
  				return -ENOMEM;
  			if (strlen(name) == 5 &&
  					!strncmp(name, "posix", 5)) {
  				F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
  			} else if (strlen(name) == 6 &&
  					!strncmp(name, "strict", 6)) {
  				F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_STRICT;
  			} else if (strlen(name) == 9 &&
  					!strncmp(name, "nobarrier", 9)) {
  				F2FS_OPTION(sbi).fsync_mode =
  							FSYNC_MODE_NOBARRIER;
  			} else {
  				kvfree(name);
  				return -EINVAL;
  			}
  			kvfree(name);
  			break;
  		case Opt_test_dummy_encryption:
  #ifdef CONFIG_FS_ENCRYPTION
  			if (!f2fs_sb_has_encrypt(sbi)) {
  				f2fs_err(sbi, "Encrypt feature is off");
  				return -EINVAL;
  			}
  
  			F2FS_OPTION(sbi).test_dummy_encryption = true;
  			f2fs_info(sbi, "Test dummy encryption mode enabled");
  #else
  			f2fs_info(sbi, "Test dummy encryption mount option ignored");
  #endif
  			break;
  		case Opt_checkpoint_disable_cap_perc:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			if (arg < 0 || arg > 100)
  				return -EINVAL;
  			if (arg == 100)
  				F2FS_OPTION(sbi).unusable_cap =
  					sbi->user_block_count;
  			else
  				F2FS_OPTION(sbi).unusable_cap =
  					(sbi->user_block_count / 100) *	arg;
  			set_opt(sbi, DISABLE_CHECKPOINT);
  			break;
  		case Opt_checkpoint_disable_cap:
  			if (args->from && match_int(args, &arg))
  				return -EINVAL;
  			F2FS_OPTION(sbi).unusable_cap = arg;
  			set_opt(sbi, DISABLE_CHECKPOINT);
  			break;
  		case Opt_checkpoint_disable:
  			set_opt(sbi, DISABLE_CHECKPOINT);
  			break;
  		case Opt_checkpoint_enable:
  			clear_opt(sbi, DISABLE_CHECKPOINT);
  			break;
  		default:
  			f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
  				 p);
  			return -EINVAL;
  		}
  	}
  #ifdef CONFIG_QUOTA
  	if (f2fs_check_quota_options(sbi))
  		return -EINVAL;
  #else
  	if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sbi->sb)) {
  		f2fs_info(sbi, "Filesystem with quota feature cannot be mounted RDWR without CONFIG_QUOTA");
  		return -EINVAL;
  	}
  	if (f2fs_sb_has_project_quota(sbi) && !f2fs_readonly(sbi->sb)) {
  		f2fs_err(sbi, "Filesystem with project quota feature cannot be mounted RDWR without CONFIG_QUOTA");
  		return -EINVAL;
  	}
  #endif
  
  	if (F2FS_IO_SIZE_BITS(sbi) && !test_opt(sbi, LFS)) {
  		f2fs_err(sbi, "Should set mode=lfs with %uKB-sized IO",
  			 F2FS_IO_SIZE_KB(sbi));
  		return -EINVAL;
  	}
  
  	if (test_opt(sbi, INLINE_XATTR_SIZE)) {
  		int min_size, max_size;
  
  		if (!f2fs_sb_has_extra_attr(sbi) ||
  			!f2fs_sb_has_flexible_inline_xattr(sbi)) {
  			f2fs_err(sbi, "extra_attr or flexible_inline_xattr feature is off");
  			return -EINVAL;
  		}
  		if (!test_opt(sbi, INLINE_XATTR)) {
  			f2fs_err(sbi, "inline_xattr_size option should be set with inline_xattr option");
  			return -EINVAL;
  		}
  
  		min_size = sizeof(struct f2fs_xattr_header) / sizeof(__le32);
  		max_size = MAX_INLINE_XATTR_SIZE;
  
  		if (F2FS_OPTION(sbi).inline_xattr_size < min_size ||
  				F2FS_OPTION(sbi).inline_xattr_size > max_size) {
  			f2fs_err(sbi, "inline xattr size is out of range: %d ~ %d",
  				 min_size, max_size);
  			return -EINVAL;
  		}
  	}
  
  	if (test_opt(sbi, DISABLE_CHECKPOINT) && test_opt(sbi, LFS)) {
  		f2fs_err(sbi, "LFS not compatible with checkpoint=disable\n");
  		return -EINVAL;
  	}
  
  	/* Not pass down write hints if the number of active logs is lesser
  	 * than NR_CURSEG_TYPE.
  	 */
  	if (F2FS_OPTION(sbi).active_logs != NR_CURSEG_TYPE)
  		F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
  	return 0;
  }
  
  static struct inode *f2fs_alloc_inode(struct super_block *sb)
  {
  	struct f2fs_inode_info *fi;
  
  	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
  	if (!fi)
  		return NULL;
  
  	init_once((void *) fi);
  
  	/* Initialize f2fs-specific inode info */
  	atomic_set(&fi->dirty_pages, 0);
  	init_rwsem(&fi->i_sem);
  	INIT_LIST_HEAD(&fi->dirty_list);
  	INIT_LIST_HEAD(&fi->gdirty_list);
  	INIT_LIST_HEAD(&fi->inmem_ilist);
  	INIT_LIST_HEAD(&fi->inmem_pages);
  	mutex_init(&fi->inmem_lock);
  	init_rwsem(&fi->i_gc_rwsem[READ]);
  	init_rwsem(&fi->i_gc_rwsem[WRITE]);
  	init_rwsem(&fi->i_mmap_sem);
  	init_rwsem(&fi->i_xattr_sem);
  
  	/* Will be used by directory only */
  	fi->i_dir_level = F2FS_SB(sb)->dir_level;
  
  	return &fi->vfs_inode;
  }
  
  static int f2fs_drop_inode(struct inode *inode)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	int ret;
  
  	/*
  	 * during filesystem shutdown, if checkpoint is disabled,
  	 * drop useless meta/node dirty pages.
  	 */
  	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
  		if (inode->i_ino == F2FS_NODE_INO(sbi) ||
  			inode->i_ino == F2FS_META_INO(sbi)) {
  			trace_f2fs_drop_inode(inode, 1);
  			return 1;
  		}
  	}
  
  	/*
  	 * This is to avoid a deadlock condition like below.
  	 * writeback_single_inode(inode)
  	 *  - f2fs_write_data_page
  	 *    - f2fs_gc -> iput -> evict
  	 *       - inode_wait_for_writeback(inode)
  	 */
  	if ((!inode_unhashed(inode) && inode->i_state & I_SYNC)) {
  		if (!inode->i_nlink && !is_bad_inode(inode)) {
  			/* to avoid evict_inode call simultaneously */
  			atomic_inc(&inode->i_count);
  			spin_unlock(&inode->i_lock);
  
  			/* some remained atomic pages should discarded */
  			if (f2fs_is_atomic_file(inode))
  				f2fs_drop_inmem_pages(inode);
  
  			/* should remain fi->extent_tree for writepage */
  			f2fs_destroy_extent_node(inode);
  
  			sb_start_intwrite(inode->i_sb);
  			f2fs_i_size_write(inode, 0);
  
  			f2fs_submit_merged_write_cond(F2FS_I_SB(inode),
  					inode, NULL, 0, DATA);
  			truncate_inode_pages_final(inode->i_mapping);
  
  			if (F2FS_HAS_BLOCKS(inode))
  				f2fs_truncate(inode);
  
  			sb_end_intwrite(inode->i_sb);
  
  			spin_lock(&inode->i_lock);
  			atomic_dec(&inode->i_count);
  		}
  		trace_f2fs_drop_inode(inode, 0);
  		return 0;
  	}
  	ret = generic_drop_inode(inode);
  	trace_f2fs_drop_inode(inode, ret);
  	return ret;
  }
  
  int f2fs_inode_dirtied(struct inode *inode, bool sync)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	int ret = 0;
  
  	spin_lock(&sbi->inode_lock[DIRTY_META]);
  	if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
  		ret = 1;
  	} else {
  		set_inode_flag(inode, FI_DIRTY_INODE);
  		stat_inc_dirty_inode(sbi, DIRTY_META);
  	}
  	if (sync && list_empty(&F2FS_I(inode)->gdirty_list)) {
  		list_add_tail(&F2FS_I(inode)->gdirty_list,
  				&sbi->inode_list[DIRTY_META]);
  		inc_page_count(sbi, F2FS_DIRTY_IMETA);
  	}
  	spin_unlock(&sbi->inode_lock[DIRTY_META]);
  	return ret;
  }
  
  void f2fs_inode_synced(struct inode *inode)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  
  	spin_lock(&sbi->inode_lock[DIRTY_META]);
  	if (!is_inode_flag_set(inode, FI_DIRTY_INODE)) {
  		spin_unlock(&sbi->inode_lock[DIRTY_META]);
  		return;
  	}
  	if (!list_empty(&F2FS_I(inode)->gdirty_list)) {
  		list_del_init(&F2FS_I(inode)->gdirty_list);
  		dec_page_count(sbi, F2FS_DIRTY_IMETA);
  	}
  	clear_inode_flag(inode, FI_DIRTY_INODE);
  	clear_inode_flag(inode, FI_AUTO_RECOVER);
  	stat_dec_dirty_inode(F2FS_I_SB(inode), DIRTY_META);
  	spin_unlock(&sbi->inode_lock[DIRTY_META]);
  }
  
  /*
   * f2fs_dirty_inode() is called from __mark_inode_dirty()
   *
   * We should call set_dirty_inode to write the dirty inode through write_inode.
   */
  static void f2fs_dirty_inode(struct inode *inode, int flags)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  
  	if (inode->i_ino == F2FS_NODE_INO(sbi) ||
  			inode->i_ino == F2FS_META_INO(sbi))
  		return;
  
  	if (flags == I_DIRTY_TIME)
  		return;
  
  	if (is_inode_flag_set(inode, FI_AUTO_RECOVER))
  		clear_inode_flag(inode, FI_AUTO_RECOVER);
  
  	f2fs_inode_dirtied(inode, false);
  }
  
  static void f2fs_i_callback(struct rcu_head *head)
  {
  	struct inode *inode = container_of(head, struct inode, i_rcu);
  
  	fscrypt_free_inode(inode);
  
  	kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
  }
  
  static void f2fs_destroy_inode(struct inode *inode)
  {
  	call_rcu(&inode->i_rcu, f2fs_i_callback);
  }
  
  static void destroy_percpu_info(struct f2fs_sb_info *sbi)
  {
  	percpu_counter_destroy(&sbi->alloc_valid_block_count);
  	percpu_counter_destroy(&sbi->total_valid_inode_count);
  }
  
  static void destroy_device_list(struct f2fs_sb_info *sbi)
  {
  	int i;
  
  	for (i = 0; i < sbi->s_ndevs; i++) {
  		blkdev_put(FDEV(i).bdev, FMODE_EXCL);
  #ifdef CONFIG_BLK_DEV_ZONED
  		kvfree(FDEV(i).blkz_seq);
  #endif
  	}
  	kvfree(sbi->devs);
  }
  
  static void f2fs_put_super(struct super_block *sb)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	int i;
  	bool dropped;
  
  	f2fs_quota_off_umount(sb);
  
  	/* prevent remaining shrinker jobs */
  	mutex_lock(&sbi->umount_mutex);
  
  	/*
  	 * We don't need to do checkpoint when superblock is clean.
  	 * But, the previous checkpoint was not done by umount, it needs to do
  	 * clean checkpoint again.
  	 */
  	if ((is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
  			!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG))) {
  		struct cp_control cpc = {
  			.reason = CP_UMOUNT,
  		};
  		f2fs_write_checkpoint(sbi, &cpc);
  	}
  
  	/* be sure to wait for any on-going discard commands */
  	dropped = f2fs_issue_discard_timeout(sbi);
  
  	if ((f2fs_hw_support_discard(sbi) || f2fs_hw_should_discard(sbi)) &&
  					!sbi->discard_blks && !dropped) {
  		struct cp_control cpc = {
  			.reason = CP_UMOUNT | CP_TRIMMED,
  		};
  		f2fs_write_checkpoint(sbi, &cpc);
  	}
  
  	/*
  	 * normally superblock is clean, so we need to release this.
  	 * In addition, EIO will skip do checkpoint, we need this as well.
  	 */
  	f2fs_release_ino_entry(sbi, true);
  
  	f2fs_leave_shrinker(sbi);
  	mutex_unlock(&sbi->umount_mutex);
  
  	/* our cp_error case, we can wait for any writeback page */
  	f2fs_flush_merged_writes(sbi);
  
  	f2fs_wait_on_all_pages_writeback(sbi);
  
  	f2fs_bug_on(sbi, sbi->fsync_node_num);
  
  	iput(sbi->node_inode);
  	sbi->node_inode = NULL;
  
  	iput(sbi->meta_inode);
  	sbi->meta_inode = NULL;
  
  	/*
  	 * iput() can update stat information, if f2fs_write_checkpoint()
  	 * above failed with error.
  	 */
  	f2fs_destroy_stats(sbi);
  
  	/* destroy f2fs internal modules */
  	f2fs_destroy_node_manager(sbi);
  	f2fs_destroy_segment_manager(sbi);
  
  	kvfree(sbi->ckpt);
  
  	f2fs_unregister_sysfs(sbi);
  
  	sb->s_fs_info = NULL;
  	if (sbi->s_chksum_driver)
  		crypto_free_shash(sbi->s_chksum_driver);
  	kvfree(sbi->raw_super);
  
  	destroy_device_list(sbi);
  	mempool_destroy(sbi->write_io_dummy);
  #ifdef CONFIG_QUOTA
  	for (i = 0; i < MAXQUOTAS; i++)
  		kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
  #endif
  	destroy_percpu_info(sbi);
  	for (i = 0; i < NR_PAGE_TYPE; i++)
  		kvfree(sbi->write_io[i]);
  	kvfree(sbi);
  }
  
  int f2fs_sync_fs(struct super_block *sb, int sync)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	int err = 0;
  
  	if (unlikely(f2fs_cp_error(sbi)))
  		return 0;
  	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
  		return 0;
  
  	trace_f2fs_sync_fs(sb, sync);
  
  	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
  		return -EAGAIN;
  
  	if (sync) {
  		struct cp_control cpc;
  
  		cpc.reason = __get_cp_reason(sbi);
  
  		mutex_lock(&sbi->gc_mutex);
  		err = f2fs_write_checkpoint(sbi, &cpc);
  		mutex_unlock(&sbi->gc_mutex);
  	}
  	f2fs_trace_ios(NULL, 1);
  
  	return err;
  }
  
  static int f2fs_freeze(struct super_block *sb)
  {
  	if (f2fs_readonly(sb))
  		return 0;
  
  	/* IO error happened before */
  	if (unlikely(f2fs_cp_error(F2FS_SB(sb))))
  		return -EIO;
  
  	/* must be clean, since sync_filesystem() was already called */
  	if (is_sbi_flag_set(F2FS_SB(sb), SBI_IS_DIRTY))
  		return -EINVAL;
  	return 0;
  }
  
  static int f2fs_unfreeze(struct super_block *sb)
  {
  	return 0;
  }
  
  #ifdef CONFIG_QUOTA
  static int f2fs_statfs_project(struct super_block *sb,
  				kprojid_t projid, struct kstatfs *buf)
  {
  	struct kqid qid;
  	struct dquot *dquot;
  	u64 limit;
  	u64 curblock;
  
  	qid = make_kqid_projid(projid);
  	dquot = dqget(sb, qid);
  	if (IS_ERR(dquot))
  		return PTR_ERR(dquot);
  	spin_lock(&dq_data_lock);
  
  	limit = (dquot->dq_dqb.dqb_bsoftlimit ?
  		 dquot->dq_dqb.dqb_bsoftlimit :
  		 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
  	if (limit && buf->f_blocks > limit) {
  		curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
  		buf->f_blocks = limit;
  		buf->f_bfree = buf->f_bavail =
  			(buf->f_blocks > curblock) ?
  			 (buf->f_blocks - curblock) : 0;
  	}
  
  	limit = dquot->dq_dqb.dqb_isoftlimit ?
  		dquot->dq_dqb.dqb_isoftlimit :
  		dquot->dq_dqb.dqb_ihardlimit;
  	if (limit && buf->f_files > limit) {
  		buf->f_files = limit;
  		buf->f_ffree =
  			(buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
  			 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
  	}
  
  	spin_unlock(&dq_data_lock);
  	dqput(dquot);
  	return 0;
  }
  #endif
  
  static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
  {
  	struct super_block *sb = dentry->d_sb;
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
  	block_t total_count, user_block_count, start_count;
  	u64 avail_node_count;
  
  	total_count = le64_to_cpu(sbi->raw_super->block_count);
  	user_block_count = sbi->user_block_count;
  	start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
  	buf->f_type = F2FS_SUPER_MAGIC;
  	buf->f_bsize = sbi->blocksize;
  
  	buf->f_blocks = total_count - start_count;
  	buf->f_bfree = user_block_count - valid_user_blocks(sbi) -
  						sbi->current_reserved_blocks;
  
  	spin_lock(&sbi->stat_lock);
  	if (unlikely(buf->f_bfree <= sbi->unusable_block_count))
  		buf->f_bfree = 0;
  	else
  		buf->f_bfree -= sbi->unusable_block_count;
  	spin_unlock(&sbi->stat_lock);
  
  	if (buf->f_bfree > F2FS_OPTION(sbi).root_reserved_blocks)
  		buf->f_bavail = buf->f_bfree -
  				F2FS_OPTION(sbi).root_reserved_blocks;
  	else
  		buf->f_bavail = 0;
  
  	avail_node_count = sbi->total_node_count - sbi->nquota_files -
  						F2FS_RESERVED_NODE_NUM;
  
  	if (avail_node_count > user_block_count) {
  		buf->f_files = user_block_count;
  		buf->f_ffree = buf->f_bavail;
  	} else {
  		buf->f_files = avail_node_count;
  		buf->f_ffree = min(avail_node_count - valid_node_count(sbi),
  					buf->f_bavail);
  	}
  
  	buf->f_namelen = F2FS_NAME_LEN;
  	buf->f_fsid.val[0] = (u32)id;
  	buf->f_fsid.val[1] = (u32)(id >> 32);
  
  #ifdef CONFIG_QUOTA
  	if (is_inode_flag_set(dentry->d_inode, FI_PROJ_INHERIT) &&
  			sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
  		f2fs_statfs_project(sb, F2FS_I(dentry->d_inode)->i_projid, buf);
  	}
  #endif
  	return 0;
  }
  
  static inline void f2fs_show_quota_options(struct seq_file *seq,
  					   struct super_block *sb)
  {
  #ifdef CONFIG_QUOTA
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  
  	if (F2FS_OPTION(sbi).s_jquota_fmt) {
  		char *fmtname = "";
  
  		switch (F2FS_OPTION(sbi).s_jquota_fmt) {
  		case QFMT_VFS_OLD:
  			fmtname = "vfsold";
  			break;
  		case QFMT_VFS_V0:
  			fmtname = "vfsv0";
  			break;
  		case QFMT_VFS_V1:
  			fmtname = "vfsv1";
  			break;
  		}
  		seq_printf(seq, ",jqfmt=%s", fmtname);
  	}
  
  	if (F2FS_OPTION(sbi).s_qf_names[USRQUOTA])
  		seq_show_option(seq, "usrjquota",
  			F2FS_OPTION(sbi).s_qf_names[USRQUOTA]);
  
  	if (F2FS_OPTION(sbi).s_qf_names[GRPQUOTA])
  		seq_show_option(seq, "grpjquota",
  			F2FS_OPTION(sbi).s_qf_names[GRPQUOTA]);
  
  	if (F2FS_OPTION(sbi).s_qf_names[PRJQUOTA])
  		seq_show_option(seq, "prjjquota",
  			F2FS_OPTION(sbi).s_qf_names[PRJQUOTA]);
  #endif
  }
  
  static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
  
  	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
  		if (test_opt(sbi, FORCE_FG_GC))
  			seq_printf(seq, ",background_gc=%s", "sync");
  		else
  			seq_printf(seq, ",background_gc=%s", "on");
  	} else {
  		seq_printf(seq, ",background_gc=%s", "off");
  	}
  	if (test_opt(sbi, DISABLE_ROLL_FORWARD))
  		seq_puts(seq, ",disable_roll_forward");
  	if (test_opt(sbi, DISCARD))
  		seq_puts(seq, ",discard");
  	else
  		seq_puts(seq, ",nodiscard");
  	if (test_opt(sbi, NOHEAP))
  		seq_puts(seq, ",no_heap");
  	else
  		seq_puts(seq, ",heap");
  #ifdef CONFIG_F2FS_FS_XATTR
  	if (test_opt(sbi, XATTR_USER))
  		seq_puts(seq, ",user_xattr");
  	else
  		seq_puts(seq, ",nouser_xattr");
  	if (test_opt(sbi, INLINE_XATTR))
  		seq_puts(seq, ",inline_xattr");
  	else
  		seq_puts(seq, ",noinline_xattr");
  	if (test_opt(sbi, INLINE_XATTR_SIZE))
  		seq_printf(seq, ",inline_xattr_size=%u",
  					F2FS_OPTION(sbi).inline_xattr_size);
  #endif
  #ifdef CONFIG_F2FS_FS_POSIX_ACL
  	if (test_opt(sbi, POSIX_ACL))
  		seq_puts(seq, ",acl");
  	else
  		seq_puts(seq, ",noacl");
  #endif
  	if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
  		seq_puts(seq, ",disable_ext_identify");
  	if (test_opt(sbi, INLINE_DATA))
  		seq_puts(seq, ",inline_data");
  	else
  		seq_puts(seq, ",noinline_data");
  	if (test_opt(sbi, INLINE_DENTRY))
  		seq_puts(seq, ",inline_dentry");
  	else
  		seq_puts(seq, ",noinline_dentry");
  	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
  		seq_puts(seq, ",flush_merge");
  	if (test_opt(sbi, NOBARRIER))
  		seq_puts(seq, ",nobarrier");
  	if (test_opt(sbi, FASTBOOT))
  		seq_puts(seq, ",fastboot");
  	if (test_opt(sbi, EXTENT_CACHE))
  		seq_puts(seq, ",extent_cache");
  	else
  		seq_puts(seq, ",noextent_cache");
  	if (test_opt(sbi, DATA_FLUSH))
  		seq_puts(seq, ",data_flush");
  
  	seq_puts(seq, ",mode=");
  	if (test_opt(sbi, ADAPTIVE))
  		seq_puts(seq, "adaptive");
  	else if (test_opt(sbi, LFS))
  		seq_puts(seq, "lfs");
  	seq_printf(seq, ",active_logs=%u", F2FS_OPTION(sbi).active_logs);
  	if (test_opt(sbi, RESERVE_ROOT))
  		seq_printf(seq, ",reserve_root=%u,resuid=%u,resgid=%u",
  				F2FS_OPTION(sbi).root_reserved_blocks,
  				from_kuid_munged(&init_user_ns,
  					F2FS_OPTION(sbi).s_resuid),
  				from_kgid_munged(&init_user_ns,
  					F2FS_OPTION(sbi).s_resgid));
  	if (F2FS_IO_SIZE_BITS(sbi))
  		seq_printf(seq, ",io_bits=%u",
  				F2FS_OPTION(sbi).write_io_size_bits);
  #ifdef CONFIG_F2FS_FAULT_INJECTION
  	if (test_opt(sbi, FAULT_INJECTION)) {
  		seq_printf(seq, ",fault_injection=%u",
  				F2FS_OPTION(sbi).fault_info.inject_rate);
  		seq_printf(seq, ",fault_type=%u",
  				F2FS_OPTION(sbi).fault_info.inject_type);
  	}
  #endif
  #ifdef CONFIG_QUOTA
  	if (test_opt(sbi, QUOTA))
  		seq_puts(seq, ",quota");
  	if (test_opt(sbi, USRQUOTA))
  		seq_puts(seq, ",usrquota");
  	if (test_opt(sbi, GRPQUOTA))
  		seq_puts(seq, ",grpquota");
  	if (test_opt(sbi, PRJQUOTA))
  		seq_puts(seq, ",prjquota");
  #endif
  	f2fs_show_quota_options(seq, sbi->sb);
  	if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_USER)
  		seq_printf(seq, ",whint_mode=%s", "user-based");
  	else if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_FS)
  		seq_printf(seq, ",whint_mode=%s", "fs-based");
  #ifdef CONFIG_FS_ENCRYPTION
  	if (F2FS_OPTION(sbi).test_dummy_encryption)
  		seq_puts(seq, ",test_dummy_encryption");
  #endif
  
  	if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_DEFAULT)
  		seq_printf(seq, ",alloc_mode=%s", "default");
  	else if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_REUSE)
  		seq_printf(seq, ",alloc_mode=%s", "reuse");
  
  	if (test_opt(sbi, DISABLE_CHECKPOINT))
  		seq_printf(seq, ",checkpoint=disable:%u",
  				F2FS_OPTION(sbi).unusable_cap);
  	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_POSIX)
  		seq_printf(seq, ",fsync_mode=%s", "posix");
  	else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
  		seq_printf(seq, ",fsync_mode=%s", "strict");
  	else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_NOBARRIER)
  		seq_printf(seq, ",fsync_mode=%s", "nobarrier");
  	return 0;
  }
  
  static void default_options(struct f2fs_sb_info *sbi)
  {
  	/* init some FS parameters */
  	F2FS_OPTION(sbi).active_logs = NR_CURSEG_TYPE;
  	F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
  	F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
  	F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
  	F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
  	F2FS_OPTION(sbi).test_dummy_encryption = false;
  	F2FS_OPTION(sbi).s_resuid = make_kuid(&init_user_ns, F2FS_DEF_RESUID);
  	F2FS_OPTION(sbi).s_resgid = make_kgid(&init_user_ns, F2FS_DEF_RESGID);
  
  	set_opt(sbi, BG_GC);
  	set_opt(sbi, INLINE_XATTR);
  	set_opt(sbi, INLINE_DATA);
  	set_opt(sbi, INLINE_DENTRY);
  	set_opt(sbi, EXTENT_CACHE);
  	set_opt(sbi, NOHEAP);
  	sbi->sb->s_flags |= MS_LAZYTIME;
  	clear_opt(sbi, DISABLE_CHECKPOINT);
  	F2FS_OPTION(sbi).unusable_cap = 0;
  	set_opt(sbi, FLUSH_MERGE);
  	set_opt(sbi, DISCARD);
  	if (f2fs_sb_has_blkzoned(sbi))
  		set_opt_mode(sbi, F2FS_MOUNT_LFS);
  	else
  		set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
  
  #ifdef CONFIG_F2FS_FS_XATTR
  	set_opt(sbi, XATTR_USER);
  #endif
  #ifdef CONFIG_F2FS_FS_POSIX_ACL
  	set_opt(sbi, POSIX_ACL);
  #endif
  
  	f2fs_build_fault_attr(sbi, 0, 0);
  }
  
  #ifdef CONFIG_QUOTA
  static int f2fs_enable_quotas(struct super_block *sb);
  #endif
  
  static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
  {
  	unsigned int s_flags = sbi->sb->s_flags;
  	struct cp_control cpc;
  	int err = 0;
  	int ret;
  	block_t unusable;
  
  	if (s_flags & MS_RDONLY) {
  		f2fs_err(sbi, "checkpoint=disable on readonly fs");
  		return -EINVAL;
  	}
  	sbi->sb->s_flags |= MS_ACTIVE;
  
  	f2fs_update_time(sbi, DISABLE_TIME);
  
  	while (!f2fs_time_over(sbi, DISABLE_TIME)) {
  		mutex_lock(&sbi->gc_mutex);
  		err = f2fs_gc(sbi, true, false, NULL_SEGNO);
  		if (err == -ENODATA) {
  			err = 0;
  			break;
  		}
  		if (err && err != -EAGAIN)
  			break;
  	}
  
  	ret = sync_filesystem(sbi->sb);
  	if (ret || err) {
  		err = ret ? ret: err;
  		goto restore_flag;
  	}
  
  	unusable = f2fs_get_unusable_blocks(sbi);
  	if (f2fs_disable_cp_again(sbi, unusable)) {
  		err = -EAGAIN;
  		goto restore_flag;
  	}
  
  	mutex_lock(&sbi->gc_mutex);
  	cpc.reason = CP_PAUSE;
  	set_sbi_flag(sbi, SBI_CP_DISABLED);
  	err = f2fs_write_checkpoint(sbi, &cpc);
  	if (err)
  		goto out_unlock;
  
  	spin_lock(&sbi->stat_lock);
  	sbi->unusable_block_count = unusable;
  	spin_unlock(&sbi->stat_lock);
  
  out_unlock:
  	mutex_unlock(&sbi->gc_mutex);
  restore_flag:
  	sbi->sb->s_flags = s_flags;	/* Restore MS_RDONLY status */
  	return err;
  }
  
  static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
  {
  	mutex_lock(&sbi->gc_mutex);
  	f2fs_dirty_to_prefree(sbi);
  
  	clear_sbi_flag(sbi, SBI_CP_DISABLED);
  	set_sbi_flag(sbi, SBI_IS_DIRTY);
  	mutex_unlock(&sbi->gc_mutex);
  
  	f2fs_sync_fs(sbi->sb, 1);
  }
  
  static int f2fs_remount(struct super_block *sb, int *flags, char *data)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	struct f2fs_mount_info org_mount_opt;
  	unsigned long old_sb_flags;
  	int err;
  	bool need_restart_gc = false;
  	bool need_stop_gc = false;
  	bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
  	bool disable_checkpoint = test_opt(sbi, DISABLE_CHECKPOINT);
  	bool checkpoint_changed;
  #ifdef CONFIG_QUOTA
  	int i, j;
  #endif
  
  	/*
  	 * Save the old mount options in case we
  	 * need to restore them.
  	 */
  	org_mount_opt = sbi->mount_opt;
  	old_sb_flags = sb->s_flags;
  
  #ifdef CONFIG_QUOTA
  	org_mount_opt.s_jquota_fmt = F2FS_OPTION(sbi).s_jquota_fmt;
  	for (i = 0; i < MAXQUOTAS; i++) {
  		if (F2FS_OPTION(sbi).s_qf_names[i]) {
  			org_mount_opt.s_qf_names[i] =
  				kstrdup(F2FS_OPTION(sbi).s_qf_names[i],
  				GFP_KERNEL);
  			if (!org_mount_opt.s_qf_names[i]) {
  				for (j = 0; j < i; j++)
  					kvfree(org_mount_opt.s_qf_names[j]);
  				return -ENOMEM;
  			}
  		} else {
  			org_mount_opt.s_qf_names[i] = NULL;
  		}
  	}
  #endif
  
  	/* recover superblocks we couldn't write due to previous RO mount */
  	if (!(*flags & MS_RDONLY) && is_sbi_flag_set(sbi, SBI_NEED_SB_WRITE)) {
  		err = f2fs_commit_super(sbi, false);
  		f2fs_info(sbi, "Try to recover all the superblocks, ret: %d",
  			  err);
  		if (!err)
  			clear_sbi_flag(sbi, SBI_NEED_SB_WRITE);
  	}
  
  	default_options(sbi);
  
  	/* parse mount options */
  	err = parse_options(sb, data);
  	if (err)
  		goto restore_opts;
  	checkpoint_changed =
  			disable_checkpoint != test_opt(sbi, DISABLE_CHECKPOINT);
  
  	/*
  	 * Previous and new state of filesystem is RO,
  	 * so skip checking GC and FLUSH_MERGE conditions.
  	 */
  	if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
  		goto skip;
  
  #ifdef CONFIG_QUOTA
  	if (!f2fs_readonly(sb) && (*flags & MS_RDONLY)) {
  		err = dquot_suspend(sb, -1);
  		if (err < 0)
  			goto restore_opts;
  	} else if (f2fs_readonly(sb) && !(*flags & MS_RDONLY)) {
  		/* dquot_resume needs RW */
  		sb->s_flags &= ~MS_RDONLY;
  		if (sb_any_quota_suspended(sb)) {
  			dquot_resume(sb, -1);
  		} else if (f2fs_sb_has_quota_ino(sbi)) {
  			err = f2fs_enable_quotas(sb);
  			if (err)
  				goto restore_opts;
  		}
  	}
  #endif
  	/* disallow enable/disable extent_cache dynamically */
  	if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
  		err = -EINVAL;
  		f2fs_warn(sbi, "switch extent_cache option is not allowed");
  		goto restore_opts;
  	}
  
  	if ((*flags & MS_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
  		err = -EINVAL;
  		f2fs_warn(sbi, "disabling checkpoint not compatible with read-only");
  		goto restore_opts;
  	}
  
  	/*
  	 * We stop the GC thread if FS is mounted as RO
  	 * or if background_gc = off is passed in mount
  	 * option. Also sync the filesystem.
  	 */
  	if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
  		if (sbi->gc_thread) {
  			f2fs_stop_gc_thread(sbi);
  			need_restart_gc = true;
  		}
  	} else if (!sbi->gc_thread) {
  		err = f2fs_start_gc_thread(sbi);
  		if (err)
  			goto restore_opts;
  		need_stop_gc = true;
  	}
  
  	if (*flags & MS_RDONLY ||
  		F2FS_OPTION(sbi).whint_mode != org_mount_opt.whint_mode) {
  		writeback_inodes_sb(sb, WB_REASON_SYNC);
  		sync_inodes_sb(sb);
  
  		set_sbi_flag(sbi, SBI_IS_DIRTY);
  		set_sbi_flag(sbi, SBI_IS_CLOSE);
  		f2fs_sync_fs(sb, 1);
  		clear_sbi_flag(sbi, SBI_IS_CLOSE);
  	}
  
  	if (checkpoint_changed) {
  		if (test_opt(sbi, DISABLE_CHECKPOINT)) {
  			err = f2fs_disable_checkpoint(sbi);
  			if (err)
  				goto restore_gc;
  		} else {
  			f2fs_enable_checkpoint(sbi);
  		}
  	}
  
  	/*
  	 * We stop issue flush thread if FS is mounted as RO
  	 * or if flush_merge is not passed in mount option.
  	 */
  	if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
  		clear_opt(sbi, FLUSH_MERGE);
  		f2fs_destroy_flush_cmd_control(sbi, false);
  	} else {
  		err = f2fs_create_flush_cmd_control(sbi);
  		if (err)
  			goto restore_gc;
  	}
  skip:
  #ifdef CONFIG_QUOTA
  	/* Release old quota file names */
  	for (i = 0; i < MAXQUOTAS; i++)
  		kvfree(org_mount_opt.s_qf_names[i]);
  #endif
  	/* Update the POSIXACL Flag */
  	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
  		(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
  
  	limit_reserve_root(sbi);
  	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
  	return 0;
  restore_gc:
  	if (need_restart_gc) {
  		if (f2fs_start_gc_thread(sbi))
  			f2fs_warn(sbi, "background gc thread has stopped");
  	} else if (need_stop_gc) {
  		f2fs_stop_gc_thread(sbi);
  	}
  restore_opts:
  #ifdef CONFIG_QUOTA
  	F2FS_OPTION(sbi).s_jquota_fmt = org_mount_opt.s_jquota_fmt;
  	for (i = 0; i < MAXQUOTAS; i++) {
  		kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
  		F2FS_OPTION(sbi).s_qf_names[i] = org_mount_opt.s_qf_names[i];
  	}
  #endif
  	sbi->mount_opt = org_mount_opt;
  	sb->s_flags = old_sb_flags;
  	return err;
  }
  
  #ifdef CONFIG_QUOTA
  /* Read data from quotafile */
  static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
  			       size_t len, loff_t off)
  {
  	struct inode *inode = sb_dqopt(sb)->files[type];
  	struct address_space *mapping = inode->i_mapping;
  	block_t blkidx = F2FS_BYTES_TO_BLK(off);
  	int offset = off & (sb->s_blocksize - 1);
  	int tocopy;
  	size_t toread;
  	loff_t i_size = i_size_read(inode);
  	struct page *page;
  	char *kaddr;
  
  	if (off > i_size)
  		return 0;
  
  	if (off + len > i_size)
  		len = i_size - off;
  	toread = len;
  	while (toread > 0) {
  		tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
  repeat:
  		page = read_cache_page_gfp(mapping, blkidx, GFP_NOFS);
  		if (IS_ERR(page)) {
  			if (PTR_ERR(page) == -ENOMEM) {
  				congestion_wait(BLK_RW_ASYNC, HZ/50);
  				goto repeat;
  			}
  			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
  			return PTR_ERR(page);
  		}
  
  		lock_page(page);
  
  		if (unlikely(page->mapping != mapping)) {
  			f2fs_put_page(page, 1);
  			goto repeat;
  		}
  		if (unlikely(!PageUptodate(page))) {
  			f2fs_put_page(page, 1);
  			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
  			return -EIO;
  		}
  
  		kaddr = kmap_atomic(page);
  		memcpy(data, kaddr + offset, tocopy);
  		kunmap_atomic(kaddr);
  		f2fs_put_page(page, 1);
  
  		offset = 0;
  		toread -= tocopy;
  		data += tocopy;
  		blkidx++;
  	}
  	return len;
  }
  
  /* Write to quotafile */
  static ssize_t f2fs_quota_write(struct super_block *sb, int type,
  				const char *data, size_t len, loff_t off)
  {
  	struct inode *inode = sb_dqopt(sb)->files[type];
  	struct address_space *mapping = inode->i_mapping;
  	const struct address_space_operations *a_ops = mapping->a_ops;
  	int offset = off & (sb->s_blocksize - 1);
  	size_t towrite = len;
  	struct page *page;
  	char *kaddr;
  	int err = 0;
  	int tocopy;
  
  	while (towrite > 0) {
  		tocopy = min_t(unsigned long, sb->s_blocksize - offset,
  								towrite);
  retry:
  		err = a_ops->write_begin(NULL, mapping, off, tocopy, 0,
  							&page, NULL);
  		if (unlikely(err)) {
  			if (err == -ENOMEM) {
  				congestion_wait(BLK_RW_ASYNC, HZ/50);
  				goto retry;
  			}
  			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
  			break;
  		}
  
  		kaddr = kmap_atomic(page);
  		memcpy(kaddr + offset, data, tocopy);
  		kunmap_atomic(kaddr);
  		flush_dcache_page(page);
  
  		a_ops->write_end(NULL, mapping, off, tocopy, tocopy,
  						page, NULL);
  		offset = 0;
  		towrite -= tocopy;
  		off += tocopy;
  		data += tocopy;
  		cond_resched();
  	}
  
  	if (len == towrite)
  		return err;
  	inode->i_mtime = inode->i_ctime = current_time(inode);
  	f2fs_mark_inode_dirty_sync(inode, false);
  	return len - towrite;
  }
  
  static struct dquot **f2fs_get_dquots(struct inode *inode)
  {
  	return F2FS_I(inode)->i_dquot;
  }
  
  static qsize_t *f2fs_get_reserved_space(struct inode *inode)
  {
  	return &F2FS_I(inode)->i_reserved_quota;
  }
  
  static int f2fs_quota_on_mount(struct f2fs_sb_info *sbi, int type)
  {
  	if (is_set_ckpt_flags(sbi, CP_QUOTA_NEED_FSCK_FLAG)) {
  		f2fs_err(sbi, "quota sysfile may be corrupted, skip loading it");
  		return 0;
  	}
  
  	return dquot_quota_on_mount(sbi->sb, F2FS_OPTION(sbi).s_qf_names[type],
  					F2FS_OPTION(sbi).s_jquota_fmt, type);
  }
  
  int f2fs_enable_quota_files(struct f2fs_sb_info *sbi, bool rdonly)
  {
  	int enabled = 0;
  	int i, err;
  
  	if (f2fs_sb_has_quota_ino(sbi) && rdonly) {
  		err = f2fs_enable_quotas(sbi->sb);
  		if (err) {
  			f2fs_err(sbi, "Cannot turn on quota_ino: %d", err);
  			return 0;
  		}
  		return 1;
  	}
  
  	for (i = 0; i < MAXQUOTAS; i++) {
  		if (F2FS_OPTION(sbi).s_qf_names[i]) {
  			err = f2fs_quota_on_mount(sbi, i);
  			if (!err) {
  				enabled = 1;
  				continue;
  			}
  			f2fs_err(sbi, "Cannot turn on quotas: %d on %d",
  				 err, i);
  		}
  	}
  	return enabled;
  }
  
  static int f2fs_quota_enable(struct super_block *sb, int type, int format_id,
  			     unsigned int flags)
  {
  	struct inode *qf_inode;
  	unsigned long qf_inum;
  	int err;
  
  	BUG_ON(!f2fs_sb_has_quota_ino(F2FS_SB(sb)));
  
  	qf_inum = f2fs_qf_ino(sb, type);
  	if (!qf_inum)
  		return -EPERM;
  
  	qf_inode = f2fs_iget(sb, qf_inum);
  	if (IS_ERR(qf_inode)) {
  		f2fs_err(F2FS_SB(sb), "Bad quota inode %u:%lu", type, qf_inum);
  		return PTR_ERR(qf_inode);
  	}
  
  	/* Don't account quota for quota files to avoid recursion */
  	qf_inode->i_flags |= S_NOQUOTA;
  	err = dquot_enable(qf_inode, type, format_id, flags);
  	iput(qf_inode);
  	return err;
  }
  
  static int f2fs_enable_quotas(struct super_block *sb)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	int type, err = 0;
  	unsigned long qf_inum;
  	bool quota_mopt[MAXQUOTAS] = {
  		test_opt(sbi, USRQUOTA),
  		test_opt(sbi, GRPQUOTA),
  		test_opt(sbi, PRJQUOTA),
  	};
  
  	if (is_set_ckpt_flags(F2FS_SB(sb), CP_QUOTA_NEED_FSCK_FLAG)) {
  		f2fs_err(sbi, "quota file may be corrupted, skip loading it");
  		return 0;
  	}
  
  	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
  
  	for (type = 0; type < MAXQUOTAS; type++) {
  		qf_inum = f2fs_qf_ino(sb, type);
  		if (qf_inum) {
  			err = f2fs_quota_enable(sb, type, QFMT_VFS_V1,
  				DQUOT_USAGE_ENABLED |
  				(quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
  			if (err) {
  				f2fs_err(sbi, "Failed to enable quota tracking (type=%d, err=%d). Please run fsck to fix.",
  					 type, err);
  				for (type--; type >= 0; type--)
  					dquot_quota_off(sb, type);
  				set_sbi_flag(F2FS_SB(sb),
  						SBI_QUOTA_NEED_REPAIR);
  				return err;
  			}
  		}
  	}
  	return 0;
  }
  
  int f2fs_quota_sync(struct super_block *sb, int type)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	struct quota_info *dqopt = sb_dqopt(sb);
  	int cnt;
  	int ret;
  
  	/*
  	 * do_quotactl
  	 *  f2fs_quota_sync
  	 *  down_read(quota_sem)
  	 *  dquot_writeback_dquots()
  	 *  f2fs_dquot_commit
  	 *                            block_operation
  	 *                            down_read(quota_sem)
  	 */
  	f2fs_lock_op(sbi);
  
  	down_read(&sbi->quota_sem);
  	ret = dquot_writeback_dquots(sb, type);
  	if (ret)
  		goto out;
  
  	/*
  	 * Now when everything is written we can discard the pagecache so
  	 * that userspace sees the changes.
  	 */
  	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
  		struct address_space *mapping;
  
  		if (type != -1 && cnt != type)
  			continue;
  		if (!sb_has_quota_active(sb, cnt))
  			continue;
  
  		mapping = dqopt->files[cnt]->i_mapping;
  
  		ret = filemap_fdatawrite(mapping);
  		if (ret)
  			goto out;
  
  		/* if we are using journalled quota */
  		if (is_journalled_quota(sbi))
  			continue;
  
  		ret = filemap_fdatawait(mapping);
  		if (ret)
  			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
  
  		inode_lock(dqopt->files[cnt]);
  		truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
  		inode_unlock(dqopt->files[cnt]);
  	}
  out:
  	if (ret)
  		set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
  	up_read(&sbi->quota_sem);
  	f2fs_unlock_op(sbi);
  	return ret;
  }
  
  static int f2fs_quota_on(struct super_block *sb, int type, int format_id,
  							struct path *path)
  {
  	struct inode *inode;
  	int err;
  
  	err = f2fs_quota_sync(sb, type);
  	if (err)
  		return err;
  
  	err = dquot_quota_on(sb, type, format_id, path);
  	if (err)
  		return err;
  
  	inode = d_inode(path->dentry);
  
  	inode_lock(inode);
  	F2FS_I(inode)->i_flags |= F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL;
  	f2fs_set_inode_flags(inode);
  	inode_unlock(inode);
  	f2fs_mark_inode_dirty_sync(inode, false);
  
  	return 0;
  }
  
  static int f2fs_quota_off(struct super_block *sb, int type)
  {
  	struct inode *inode = sb_dqopt(sb)->files[type];
  	int err;
  
  	if (!inode || !igrab(inode))
  		return dquot_quota_off(sb, type);
  
  	err = f2fs_quota_sync(sb, type);
  	if (err)
  		goto out_put;
  
  	err = dquot_quota_off(sb, type);
  	if (err || f2fs_sb_has_quota_ino(F2FS_SB(sb)))
  		goto out_put;
  
  	inode_lock(inode);
  	F2FS_I(inode)->i_flags &= ~(F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL);
  	f2fs_set_inode_flags(inode);
  	inode_unlock(inode);
  	f2fs_mark_inode_dirty_sync(inode, false);
  out_put:
  	iput(inode);
  	return err;
  }
  
  void f2fs_quota_off_umount(struct super_block *sb)
  {
  	int type;
  	int err;
  
  	for (type = 0; type < MAXQUOTAS; type++) {
  		err = f2fs_quota_off(sb, type);
  		if (err) {
  			int ret = dquot_quota_off(sb, type);
  
  			f2fs_err(F2FS_SB(sb), "Fail to turn off disk quota (type: %d, err: %d, ret:%d), Please run fsck to fix it.",
  				 type, err, ret);
  			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
  		}
  	}
  	/*
  	 * In case of checkpoint=disable, we must flush quota blocks.
  	 * This can cause NULL exception for node_inode in end_io, since
  	 * put_super already dropped it.
  	 */
  	sync_filesystem(sb);
  }
  
  static void f2fs_truncate_quota_inode_pages(struct super_block *sb)
  {
  	struct quota_info *dqopt = sb_dqopt(sb);
  	int type;
  
  	for (type = 0; type < MAXQUOTAS; type++) {
  		if (!dqopt->files[type])
  			continue;
  		f2fs_inode_synced(dqopt->files[type]);
  	}
  }
  
  static int f2fs_dquot_commit(struct dquot *dquot)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
  	int ret;
  
  	down_read(&sbi->quota_sem);
  	ret = dquot_commit(dquot);
  	if (ret < 0)
  		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
  	up_read(&sbi->quota_sem);
  	return ret;
  }
  
  static int f2fs_dquot_acquire(struct dquot *dquot)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
  	int ret;
  
  	down_read(&sbi->quota_sem);
  	ret = dquot_acquire(dquot);
  	if (ret < 0)
  		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
  	up_read(&sbi->quota_sem);
  	return ret;
  }
  
  static int f2fs_dquot_release(struct dquot *dquot)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(dquot->dq_sb);
  	int ret;
  
  	down_read(&sbi->quota_sem);
  	ret = dquot_release(dquot);
  	if (ret < 0)
  		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
  	up_read(&sbi->quota_sem);
  	return ret;
  }
  
  static int f2fs_dquot_mark_dquot_dirty(struct dquot *dquot)
  {
  	struct super_block *sb = dquot->dq_sb;
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	int ret;
  
  	down_read(&sbi->quota_sem);
  	ret = dquot_mark_dquot_dirty(dquot);
  
  	/* if we are using journalled quota */
  	if (is_journalled_quota(sbi))
  		set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
  
  	up_read(&sbi->quota_sem);
  	return ret;
  }
  
  static int f2fs_dquot_commit_info(struct super_block *sb, int type)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	int ret;
  
  	down_read(&sbi->quota_sem);
  	ret = dquot_commit_info(sb, type);
  	if (ret < 0)
  		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
  	up_read(&sbi->quota_sem);
  	return ret;
  }
  
  static int f2fs_get_projid(struct inode *inode, kprojid_t *projid)
  {
  	*projid = F2FS_I(inode)->i_projid;
  	return 0;
  }
  
  static const struct dquot_operations f2fs_quota_operations = {
  	.get_reserved_space = f2fs_get_reserved_space,
  	.write_dquot	= f2fs_dquot_commit,
  	.acquire_dquot	= f2fs_dquot_acquire,
  	.release_dquot	= f2fs_dquot_release,
  	.mark_dirty	= f2fs_dquot_mark_dquot_dirty,
  	.write_info	= f2fs_dquot_commit_info,
  	.alloc_dquot	= dquot_alloc,
  	.destroy_dquot	= dquot_destroy,
  	.get_projid	= f2fs_get_projid,
  	.get_next_id	= dquot_get_next_id,
  };
  
  static const struct quotactl_ops f2fs_quotactl_ops = {
  	.quota_on	= f2fs_quota_on,
  	.quota_off	= f2fs_quota_off,
  	.quota_sync	= f2fs_quota_sync,
  	.get_state	= dquot_get_state,
  	.set_info	= dquot_set_dqinfo,
  	.get_dqblk	= dquot_get_dqblk,
  	.set_dqblk	= dquot_set_dqblk,
  	.get_nextdqblk	= dquot_get_next_dqblk,
  };
  #else
  int f2fs_quota_sync(struct super_block *sb, int type)
  {
  	return 0;
  }
  
  void f2fs_quota_off_umount(struct super_block *sb)
  {
  }
  #endif
  
  static const struct super_operations f2fs_sops = {
  	.alloc_inode	= f2fs_alloc_inode,
  	.drop_inode	= f2fs_drop_inode,
  	.destroy_inode	= f2fs_destroy_inode,
  	.write_inode	= f2fs_write_inode,
  	.dirty_inode	= f2fs_dirty_inode,
  	.show_options	= f2fs_show_options,
  #ifdef CONFIG_QUOTA
  	.quota_read	= f2fs_quota_read,
  	.quota_write	= f2fs_quota_write,
  	.get_dquots	= f2fs_get_dquots,
  #endif
  	.evict_inode	= f2fs_evict_inode,
  	.put_super	= f2fs_put_super,
  	.sync_fs	= f2fs_sync_fs,
  	.freeze_fs	= f2fs_freeze,
  	.unfreeze_fs	= f2fs_unfreeze,
  	.statfs		= f2fs_statfs,
  	.remount_fs	= f2fs_remount,
  };
  
  #ifdef CONFIG_FS_ENCRYPTION
  static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
  {
  	return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
  				F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
  				ctx, len, NULL);
  }
  
  static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
  							void *fs_data)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  
  	/*
  	 * Encrypting the root directory is not allowed because fsck
  	 * expects lost+found directory to exist and remain unencrypted
  	 * if LOST_FOUND feature is enabled.
  	 *
  	 */
  	if (f2fs_sb_has_lost_found(sbi) &&
  			inode->i_ino == F2FS_ROOT_INO(sbi))
  		return -EPERM;
  
  	return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
  				F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
  				ctx, len, fs_data, XATTR_CREATE);
  }
  
  static bool f2fs_dummy_context(struct inode *inode)
  {
  	return DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(inode));
  }
  
  static const struct fscrypt_operations f2fs_cryptops = {
  	.key_prefix	= "f2fs:",
  	.get_context	= f2fs_get_context,
  	.set_context	= f2fs_set_context,
  	.dummy_context	= f2fs_dummy_context,
  	.empty_dir	= f2fs_empty_dir,
  	.max_namelen	= F2FS_NAME_LEN,
  };
  #endif
  
  static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
  		u64 ino, u32 generation)
  {
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	struct inode *inode;
  
  	if (f2fs_check_nid_range(sbi, ino))
  		return ERR_PTR(-ESTALE);
  
  	/*
  	 * f2fs_iget isn't quite right if the inode is currently unallocated!
  	 * However f2fs_iget currently does appropriate checks to handle stale
  	 * inodes so everything is OK.
  	 */
  	inode = f2fs_iget(sb, ino);
  	if (IS_ERR(inode))
  		return ERR_CAST(inode);
  	if (unlikely(generation && inode->i_generation != generation)) {
  		/* we didn't find the right inode.. */
  		iput(inode);
  		return ERR_PTR(-ESTALE);
  	}
  	return inode;
  }
  
  static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
  		int fh_len, int fh_type)
  {
  	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
  				    f2fs_nfs_get_inode);
  }
  
  static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
  		int fh_len, int fh_type)
  {
  	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
  				    f2fs_nfs_get_inode);
  }
  
  static const struct export_operations f2fs_export_ops = {
  	.fh_to_dentry = f2fs_fh_to_dentry,
  	.fh_to_parent = f2fs_fh_to_parent,
  	.get_parent = f2fs_get_parent,
  };
  
  static loff_t max_file_blocks(void)
  {
  	loff_t result = 0;
  	loff_t leaf_count = DEF_ADDRS_PER_BLOCK;
  
  	/*
  	 * note: previously, result is equal to (DEF_ADDRS_PER_INODE -
  	 * DEFAULT_INLINE_XATTR_ADDRS), but now f2fs try to reserve more
  	 * space in inode.i_addr, it will be more safe to reassign
  	 * result as zero.
  	 */
  
  	/* two direct node blocks */
  	result += (leaf_count * 2);
  
  	/* two indirect node blocks */
  	leaf_count *= NIDS_PER_BLOCK;
  	result += (leaf_count * 2);
  
  	/* one double indirect node block */
  	leaf_count *= NIDS_PER_BLOCK;
  	result += leaf_count;
  
  	return result;
  }
  
  static int __f2fs_commit_super(struct buffer_head *bh,
  			struct f2fs_super_block *super)
  {
  	lock_buffer(bh);
  	if (super)
  		memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
  	set_buffer_dirty(bh);
  	unlock_buffer(bh);
  
  	/* it's rare case, we can do fua all the time */
  	return __sync_dirty_buffer(bh, REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
  }
  
  static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
  					struct buffer_head *bh)
  {
  	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
  					(bh->b_data + F2FS_SUPER_OFFSET);
  	struct super_block *sb = sbi->sb;
  	u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
  	u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr);
  	u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr);
  	u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr);
  	u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
  	u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
  	u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt);
  	u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit);
  	u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat);
  	u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa);
  	u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main);
  	u32 segment_count = le32_to_cpu(raw_super->segment_count);
  	u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
  	u64 main_end_blkaddr = main_blkaddr +
  				(segment_count_main << log_blocks_per_seg);
  	u64 seg_end_blkaddr = segment0_blkaddr +
  				(segment_count << log_blocks_per_seg);
  
  	if (segment0_blkaddr != cp_blkaddr) {
  		f2fs_info(sbi, "Mismatch start address, segment0(%u) cp_blkaddr(%u)",
  			  segment0_blkaddr, cp_blkaddr);
  		return true;
  	}
  
  	if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) !=
  							sit_blkaddr) {
  		f2fs_info(sbi, "Wrong CP boundary, start(%u) end(%u) blocks(%u)",
  			  cp_blkaddr, sit_blkaddr,
  			  segment_count_ckpt << log_blocks_per_seg);
  		return true;
  	}
  
  	if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) !=
  							nat_blkaddr) {
  		f2fs_info(sbi, "Wrong SIT boundary, start(%u) end(%u) blocks(%u)",
  			  sit_blkaddr, nat_blkaddr,
  			  segment_count_sit << log_blocks_per_seg);
  		return true;
  	}
  
  	if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) !=
  							ssa_blkaddr) {
  		f2fs_info(sbi, "Wrong NAT boundary, start(%u) end(%u) blocks(%u)",
  			  nat_blkaddr, ssa_blkaddr,
  			  segment_count_nat << log_blocks_per_seg);
  		return true;
  	}
  
  	if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) !=
  							main_blkaddr) {
  		f2fs_info(sbi, "Wrong SSA boundary, start(%u) end(%u) blocks(%u)",
  			  ssa_blkaddr, main_blkaddr,
  			  segment_count_ssa << log_blocks_per_seg);
  		return true;
  	}
  
  	if (main_end_blkaddr > seg_end_blkaddr) {
  		f2fs_info(sbi, "Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
  			  main_blkaddr,
  			  segment0_blkaddr +
  			  (segment_count << log_blocks_per_seg),
  			  segment_count_main << log_blocks_per_seg);
  		return true;
  	} else if (main_end_blkaddr < seg_end_blkaddr) {
  		int err = 0;
  		char *res;
  
  		/* fix in-memory information all the time */
  		raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
  				segment0_blkaddr) >> log_blocks_per_seg);
  
  		if (f2fs_readonly(sb) || bdev_read_only(sb->s_bdev)) {
  			set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
  			res = "internally";
  		} else {
  			err = __f2fs_commit_super(bh, NULL);
  			res = err ? "failed" : "done";
  		}
  		f2fs_info(sbi, "Fix alignment : %s, start(%u) end(%u) block(%u)",
  			  res, main_blkaddr,
  			  segment0_blkaddr +
  			  (segment_count << log_blocks_per_seg),
  			  segment_count_main << log_blocks_per_seg);
  		if (err)
  			return true;
  	}
  	return false;
  }
  
  static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
  				struct buffer_head *bh)
  {
  	block_t segment_count, segs_per_sec, secs_per_zone;
  	block_t total_sections, blocks_per_seg;
  	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
  					(bh->b_data + F2FS_SUPER_OFFSET);
  	unsigned int blocksize;
  	size_t crc_offset = 0;
  	__u32 crc = 0;
  
  	if (le32_to_cpu(raw_super->magic) != F2FS_SUPER_MAGIC) {
  		f2fs_info(sbi, "Magic Mismatch, valid(0x%x) - read(0x%x)",
  			  F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
  		return -EINVAL;
  	}
  
  	/* Check checksum_offset and crc in superblock */
  	if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_SB_CHKSUM)) {
  		crc_offset = le32_to_cpu(raw_super->checksum_offset);
  		if (crc_offset !=
  			offsetof(struct f2fs_super_block, crc)) {
  			f2fs_info(sbi, "Invalid SB checksum offset: %zu",
  				  crc_offset);
  			return -EFSCORRUPTED;
  		}
  		crc = le32_to_cpu(raw_super->crc);
  		if (!f2fs_crc_valid(sbi, crc, raw_super, crc_offset)) {
  			f2fs_info(sbi, "Invalid SB checksum value: %u", crc);
  			return -EFSCORRUPTED;
  		}
  	}
  
  	/* Currently, support only 4KB page cache size */
  	if (F2FS_BLKSIZE != PAGE_SIZE) {
  		f2fs_info(sbi, "Invalid page_cache_size (%lu), supports only 4KB",
  			  PAGE_SIZE);
  		return -EFSCORRUPTED;
  	}
  
  	/* Currently, support only 4KB block size */
  	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
  	if (blocksize != F2FS_BLKSIZE) {
  		f2fs_info(sbi, "Invalid blocksize (%u), supports only 4KB",
  			  blocksize);
  		return -EFSCORRUPTED;
  	}
  
  	/* check log blocks per segment */
  	if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
  		f2fs_info(sbi, "Invalid log blocks per segment (%u)",
  			  le32_to_cpu(raw_super->log_blocks_per_seg));
  		return -EFSCORRUPTED;
  	}
  
  	/* Currently, support 512/1024/2048/4096 bytes sector size */
  	if (le32_to_cpu(raw_super->log_sectorsize) >
  				F2FS_MAX_LOG_SECTOR_SIZE ||
  		le32_to_cpu(raw_super->log_sectorsize) <
  				F2FS_MIN_LOG_SECTOR_SIZE) {
  		f2fs_info(sbi, "Invalid log sectorsize (%u)",
  			  le32_to_cpu(raw_super->log_sectorsize));
  		return -EFSCORRUPTED;
  	}
  	if (le32_to_cpu(raw_super->log_sectors_per_block) +
  		le32_to_cpu(raw_super->log_sectorsize) !=
  			F2FS_MAX_LOG_SECTOR_SIZE) {
  		f2fs_info(sbi, "Invalid log sectors per block(%u) log sectorsize(%u)",
  			  le32_to_cpu(raw_super->log_sectors_per_block),
  			  le32_to_cpu(raw_super->log_sectorsize));
  		return -EFSCORRUPTED;
  	}
  
  	segment_count = le32_to_cpu(raw_super->segment_count);
  	segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
  	secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
  	total_sections = le32_to_cpu(raw_super->section_count);
  
  	/* blocks_per_seg should be 512, given the above check */
  	blocks_per_seg = 1 << le32_to_cpu(raw_super->log_blocks_per_seg);
  
  	if (segment_count > F2FS_MAX_SEGMENT ||
  				segment_count < F2FS_MIN_SEGMENTS) {
  		f2fs_info(sbi, "Invalid segment count (%u)", segment_count);
  		return -EFSCORRUPTED;
  	}
  
  	if (total_sections > segment_count ||
  			total_sections < F2FS_MIN_SEGMENTS ||
  			segs_per_sec > segment_count || !segs_per_sec) {
  		f2fs_info(sbi, "Invalid segment/section count (%u, %u x %u)",
  			  segment_count, total_sections, segs_per_sec);
  		return -EFSCORRUPTED;
  	}
  
  	if ((segment_count / segs_per_sec) < total_sections) {
  		f2fs_info(sbi, "Small segment_count (%u < %u * %u)",
  			  segment_count, segs_per_sec, total_sections);
  		return -EFSCORRUPTED;
  	}
  
  	if (segment_count > (le64_to_cpu(raw_super->block_count) >> 9)) {
  		f2fs_info(sbi, "Wrong segment_count / block_count (%u > %llu)",
  			  segment_count, le64_to_cpu(raw_super->block_count));
  		return -EFSCORRUPTED;
  	}
  
  	if (secs_per_zone > total_sections || !secs_per_zone) {
  		f2fs_info(sbi, "Wrong secs_per_zone / total_sections (%u, %u)",
  			  secs_per_zone, total_sections);
  		return -EFSCORRUPTED;
  	}
  	if (le32_to_cpu(raw_super->extension_count) > F2FS_MAX_EXTENSION ||
  			raw_super->hot_ext_count > F2FS_MAX_EXTENSION ||
  			(le32_to_cpu(raw_super->extension_count) +
  			raw_super->hot_ext_count) > F2FS_MAX_EXTENSION) {
  		f2fs_info(sbi, "Corrupted extension count (%u + %u > %u)",
  			  le32_to_cpu(raw_super->extension_count),
  			  raw_super->hot_ext_count,
  			  F2FS_MAX_EXTENSION);
  		return -EFSCORRUPTED;
  	}
  
  	if (le32_to_cpu(raw_super->cp_payload) >
  				(blocks_per_seg - F2FS_CP_PACKS)) {
  		f2fs_info(sbi, "Insane cp_payload (%u > %u)",
  			  le32_to_cpu(raw_super->cp_payload),
  			  blocks_per_seg - F2FS_CP_PACKS);
  		return -EFSCORRUPTED;
  	}
  
  	/* check reserved ino info */
  	if (le32_to_cpu(raw_super->node_ino) != 1 ||
  		le32_to_cpu(raw_super->meta_ino) != 2 ||
  		le32_to_cpu(raw_super->root_ino) != 3) {
  		f2fs_info(sbi, "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)",
  			  le32_to_cpu(raw_super->node_ino),
  			  le32_to_cpu(raw_super->meta_ino),
  			  le32_to_cpu(raw_super->root_ino));
  		return -EFSCORRUPTED;
  	}
  
  	/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
  	if (sanity_check_area_boundary(sbi, bh))
  		return -EFSCORRUPTED;
  
  	return 0;
  }
  
  int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
  {
  	unsigned int total, fsmeta;
  	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
  	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
  	unsigned int ovp_segments, reserved_segments;
  	unsigned int main_segs, blocks_per_seg;
  	unsigned int sit_segs, nat_segs;
  	unsigned int sit_bitmap_size, nat_bitmap_size;
  	unsigned int log_blocks_per_seg;
  	unsigned int segment_count_main;
  	unsigned int cp_pack_start_sum, cp_payload;
  	block_t user_block_count, valid_user_blocks;
  	block_t avail_node_count, valid_node_count;
  	int i, j;
  
  	total = le32_to_cpu(raw_super->segment_count);
  	fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
  	sit_segs = le32_to_cpu(raw_super->segment_count_sit);
  	fsmeta += sit_segs;
  	nat_segs = le32_to_cpu(raw_super->segment_count_nat);
  	fsmeta += nat_segs;
  	fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
  	fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
  
  	if (unlikely(fsmeta >= total))
  		return 1;
  
  	ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
  	reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
  
  	if (unlikely(fsmeta < F2FS_MIN_SEGMENTS ||
  			ovp_segments == 0 || reserved_segments == 0)) {
  		f2fs_err(sbi, "Wrong layout: check mkfs.f2fs version");
  		return 1;
  	}
  
  	user_block_count = le64_to_cpu(ckpt->user_block_count);
  	segment_count_main = le32_to_cpu(raw_super->segment_count_main);
  	log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
  	if (!user_block_count || user_block_count >=
  			segment_count_main << log_blocks_per_seg) {
  		f2fs_err(sbi, "Wrong user_block_count: %u",
  			 user_block_count);
  		return 1;
  	}
  
  	valid_user_blocks = le64_to_cpu(ckpt->valid_block_count);
  	if (valid_user_blocks > user_block_count) {
  		f2fs_err(sbi, "Wrong valid_user_blocks: %u, user_block_count: %u",
  			 valid_user_blocks, user_block_count);
  		return 1;
  	}
  
  	valid_node_count = le32_to_cpu(ckpt->valid_node_count);
  	avail_node_count = sbi->total_node_count - sbi->nquota_files -
  						F2FS_RESERVED_NODE_NUM;
  	if (valid_node_count > avail_node_count) {
  		f2fs_err(sbi, "Wrong valid_node_count: %u, avail_node_count: %u",
  			 valid_node_count, avail_node_count);
  		return 1;
  	}
  
  	main_segs = le32_to_cpu(raw_super->segment_count_main);
  	blocks_per_seg = sbi->blocks_per_seg;
  
  	for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
  		if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
  			le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg)
  			return 1;
  		for (j = i + 1; j < NR_CURSEG_NODE_TYPE; j++) {
  			if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
  				le32_to_cpu(ckpt->cur_node_segno[j])) {
  				f2fs_err(sbi, "Node segment (%u, %u) has the same segno: %u",
  					 i, j,
  					 le32_to_cpu(ckpt->cur_node_segno[i]));
  				return 1;
  			}
  		}
  	}
  	for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
  		if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
  			le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg)
  			return 1;
  		for (j = i + 1; j < NR_CURSEG_DATA_TYPE; j++) {
  			if (le32_to_cpu(ckpt->cur_data_segno[i]) ==
  				le32_to_cpu(ckpt->cur_data_segno[j])) {
  				f2fs_err(sbi, "Data segment (%u, %u) has the same segno: %u",
  					 i, j,
  					 le32_to_cpu(ckpt->cur_data_segno[i]));
  				return 1;
  			}
  		}
  	}
  	for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
  		for (j = 0; j < NR_CURSEG_DATA_TYPE; j++) {
  			if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
  				le32_to_cpu(ckpt->cur_data_segno[j])) {
  				f2fs_err(sbi, "Data segment (%u) and Data segment (%u) has the same segno: %u",
  					 i, j,
  					 le32_to_cpu(ckpt->cur_node_segno[i]));
  				return 1;
  			}
  		}
  	}
  
  	sit_bitmap_size = le32_to_cpu(ckpt->sit_ver_bitmap_bytesize);
  	nat_bitmap_size = le32_to_cpu(ckpt->nat_ver_bitmap_bytesize);
  
  	if (sit_bitmap_size != ((sit_segs / 2) << log_blocks_per_seg) / 8 ||
  		nat_bitmap_size != ((nat_segs / 2) << log_blocks_per_seg) / 8) {
  		f2fs_err(sbi, "Wrong bitmap size: sit: %u, nat:%u",
  			 sit_bitmap_size, nat_bitmap_size);
  		return 1;
  	}
  
  	cp_pack_start_sum = __start_sum_addr(sbi);
  	cp_payload = __cp_payload(sbi);
  	if (cp_pack_start_sum < cp_payload + 1 ||
  		cp_pack_start_sum > blocks_per_seg - 1 -
  			NR_CURSEG_TYPE) {
  		f2fs_err(sbi, "Wrong cp_pack_start_sum: %u",
  			 cp_pack_start_sum);
  		return 1;
  	}
  
  	if (__is_set_ckpt_flags(ckpt, CP_LARGE_NAT_BITMAP_FLAG) &&
  		le32_to_cpu(ckpt->checksum_offset) != CP_MIN_CHKSUM_OFFSET) {
  		f2fs_warn(sbi, "using deprecated layout of large_nat_bitmap, "
  			  "please run fsck v1.13.0 or higher to repair, chksum_offset: %u, "
  			  "fixed with patch: \"f2fs-tools: relocate chksum_offset for large_nat_bitmap feature\"",
  			  le32_to_cpu(ckpt->checksum_offset));
  		return 1;
  	}
  
  	if (unlikely(f2fs_cp_error(sbi))) {
  		f2fs_err(sbi, "A bug case: need to run fsck");
  		return 1;
  	}
  	return 0;
  }
  
  static void init_sb_info(struct f2fs_sb_info *sbi)
  {
  	struct f2fs_super_block *raw_super = sbi->raw_super;
  	int i;
  
  	sbi->log_sectors_per_block =
  		le32_to_cpu(raw_super->log_sectors_per_block);
  	sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
  	sbi->blocksize = 1 << sbi->log_blocksize;
  	sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
  	sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
  	sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
  	sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
  	sbi->total_sections = le32_to_cpu(raw_super->section_count);
  	sbi->total_node_count =
  		(le32_to_cpu(raw_super->segment_count_nat) / 2)
  			* sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
  	sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
  	sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
  	sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
  	sbi->cur_victim_sec = NULL_SECNO;
  	sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
  	sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
  	sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
  	sbi->migration_granularity = sbi->segs_per_sec;
  
  	sbi->dir_level = DEF_DIR_LEVEL;
  	sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
  	sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
  	sbi->interval_time[DISCARD_TIME] = DEF_IDLE_INTERVAL;
  	sbi->interval_time[GC_TIME] = DEF_IDLE_INTERVAL;
  	sbi->interval_time[DISABLE_TIME] = DEF_DISABLE_INTERVAL;
  	sbi->interval_time[UMOUNT_DISCARD_TIMEOUT] =
  				DEF_UMOUNT_DISCARD_TIMEOUT;
  	clear_sbi_flag(sbi, SBI_NEED_FSCK);
  
  	for (i = 0; i < NR_COUNT_TYPE; i++)
  		atomic_set(&sbi->nr_pages[i], 0);
  
  	for (i = 0; i < META; i++)
  		atomic_set(&sbi->wb_sync_req[i], 0);
  
  	INIT_LIST_HEAD(&sbi->s_list);
  	mutex_init(&sbi->umount_mutex);
  	init_rwsem(&sbi->io_order_lock);
  	spin_lock_init(&sbi->cp_lock);
  
  	sbi->dirty_device = 0;
  	spin_lock_init(&sbi->dev_lock);
  
  	init_rwsem(&sbi->sb_lock);
  }
  
  static int init_percpu_info(struct f2fs_sb_info *sbi)
  {
  	int err;
  
  	err = percpu_counter_init(&sbi->alloc_valid_block_count, 0, GFP_KERNEL);
  	if (err)
  		return err;
  
  	err = percpu_counter_init(&sbi->total_valid_inode_count, 0,
  								GFP_KERNEL);
  	if (err)
  		percpu_counter_destroy(&sbi->alloc_valid_block_count);
  
  	return err;
  }
  
  #ifdef CONFIG_BLK_DEV_ZONED
  static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
  {
  	struct block_device *bdev = FDEV(devi).bdev;
  	sector_t nr_sectors = bdev->bd_part->nr_sects;
  	sector_t sector = 0;
  	struct blk_zone *zones;
  	unsigned int i, nr_zones;
  	unsigned int n = 0;
  	int err = -EIO;
  
  	if (!f2fs_sb_has_blkzoned(sbi))
  		return 0;
  
  	if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
  				SECTOR_TO_BLOCK(bdev_zone_sectors(bdev)))
  		return -EINVAL;
  	sbi->blocks_per_blkz = SECTOR_TO_BLOCK(bdev_zone_sectors(bdev));
  	if (sbi->log_blocks_per_blkz && sbi->log_blocks_per_blkz !=
  				__ilog2_u32(sbi->blocks_per_blkz))
  		return -EINVAL;
  	sbi->log_blocks_per_blkz = __ilog2_u32(sbi->blocks_per_blkz);
  	FDEV(devi).nr_blkz = SECTOR_TO_BLOCK(nr_sectors) >>
  					sbi->log_blocks_per_blkz;
  	if (nr_sectors & (bdev_zone_sectors(bdev) - 1))
  		FDEV(devi).nr_blkz++;
  
  	FDEV(devi).blkz_seq = f2fs_kzalloc(sbi,
  					BITS_TO_LONGS(FDEV(devi).nr_blkz)
  					* sizeof(unsigned long),
  					GFP_KERNEL);
  	if (!FDEV(devi).blkz_seq)
  		return -ENOMEM;
  
  #define F2FS_REPORT_NR_ZONES   4096
  
  	zones = f2fs_kzalloc(sbi,
  			     array_size(F2FS_REPORT_NR_ZONES,
  					sizeof(struct blk_zone)),
  			     GFP_KERNEL);
  	if (!zones)
  		return -ENOMEM;
  
  	/* Get block zones type */
  	while (zones && sector < nr_sectors) {
  
  		nr_zones = F2FS_REPORT_NR_ZONES;
  		err = blkdev_report_zones(bdev, sector,
  					  zones, &nr_zones,
  					  GFP_KERNEL);
  		if (err)
  			break;
  		if (!nr_zones) {
  			err = -EIO;
  			break;
  		}
  
  		for (i = 0; i < nr_zones; i++) {
  			if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL)
  				set_bit(n, FDEV(devi).blkz_seq);
  			sector += zones[i].len;
  			n++;
  		}
  	}
  
  	kvfree(zones);
  
  	return err;
  }
  #endif
  
  /*
   * Read f2fs raw super block.
   * Because we have two copies of super block, so read both of them
   * to get the first valid one. If any one of them is broken, we pass
   * them recovery flag back to the caller.
   */
  static int read_raw_super_block(struct f2fs_sb_info *sbi,
  			struct f2fs_super_block **raw_super,
  			int *valid_super_block, int *recovery)
  {
  	struct super_block *sb = sbi->sb;
  	int block;
  	struct buffer_head *bh;
  	struct f2fs_super_block *super;
  	int err = 0;
  
  	super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
  	if (!super)
  		return -ENOMEM;
  
  	for (block = 0; block < 2; block++) {
  		bh = sb_bread(sb, block);
  		if (!bh) {
  			f2fs_err(sbi, "Unable to read %dth superblock",
  				 block + 1);
  			err = -EIO;
  			continue;
  		}
  
  		/* sanity checking of raw super */
  		err = sanity_check_raw_super(sbi, bh);
  		if (err) {
  			f2fs_err(sbi, "Can't find valid F2FS filesystem in %dth superblock",
  				 block + 1);
  			brelse(bh);
  			continue;
  		}
  
  		if (!*raw_super) {
  			memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
  							sizeof(*super));
  			*valid_super_block = block;
  			*raw_super = super;
  		}
  		brelse(bh);
  	}
  
  	/* Fail to read any one of the superblocks*/
  	if (err < 0)
  		*recovery = 1;
  
  	/* No valid superblock */
  	if (!*raw_super)
  		kvfree(super);
  	else
  		err = 0;
  
  	return err;
  }
  
  int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
  {
  	struct buffer_head *bh;
  	__u32 crc = 0;
  	int err;
  
  	if ((recover && f2fs_readonly(sbi->sb)) ||
  				bdev_read_only(sbi->sb->s_bdev)) {
  		set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
  		return -EROFS;
  	}
  
  	/* we should update superblock crc here */
  	if (!recover && f2fs_sb_has_sb_chksum(sbi)) {
  		crc = f2fs_crc32(sbi, F2FS_RAW_SUPER(sbi),
  				offsetof(struct f2fs_super_block, crc));
  		F2FS_RAW_SUPER(sbi)->crc = cpu_to_le32(crc);
  	}
  
  	/* write back-up superblock first */
  	bh = sb_bread(sbi->sb, sbi->valid_super_block ? 0 : 1);
  	if (!bh)
  		return -EIO;
  	err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
  	brelse(bh);
  
  	/* if we are in recovery path, skip writing valid superblock */
  	if (recover || err)
  		return err;
  
  	/* write current valid superblock */
  	bh = sb_bread(sbi->sb, sbi->valid_super_block);
  	if (!bh)
  		return -EIO;
  	err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
  	brelse(bh);
  	return err;
  }
  
  static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
  {
  	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
  	unsigned int max_devices = MAX_DEVICES;
  	int i;
  
  	/* Initialize single device information */
  	if (!RDEV(0).path[0]) {
  #ifdef CONFIG_BLK_DEV_ZONED
  		if (!bdev_is_zoned(sbi->sb->s_bdev))
  			return 0;
  		max_devices = 1;
  #else
  		return 0;
  #endif
  	}
  
  	/*
  	 * Initialize multiple devices information, or single
  	 * zoned block device information.
  	 */
  	sbi->devs = f2fs_kzalloc(sbi,
  				 array_size(max_devices,
  					    sizeof(struct f2fs_dev_info)),
  				 GFP_KERNEL);
  	if (!sbi->devs)
  		return -ENOMEM;
  
  	for (i = 0; i < max_devices; i++) {
  
  		if (i > 0 && !RDEV(i).path[0])
  			break;
  
  		if (max_devices == 1) {
  			/* Single zoned block device mount */
  			FDEV(0).bdev =
  				blkdev_get_by_dev(sbi->sb->s_bdev->bd_dev,
  					sbi->sb->s_mode, sbi->sb->s_type);
  		} else {
  			/* Multi-device mount */
  			memcpy(FDEV(i).path, RDEV(i).path, MAX_PATH_LEN);
  			FDEV(i).total_segments =
  				le32_to_cpu(RDEV(i).total_segments);
  			if (i == 0) {
  				FDEV(i).start_blk = 0;
  				FDEV(i).end_blk = FDEV(i).start_blk +
  				    (FDEV(i).total_segments <<
  				    sbi->log_blocks_per_seg) - 1 +
  				    le32_to_cpu(raw_super->segment0_blkaddr);
  			} else {
  				FDEV(i).start_blk = FDEV(i - 1).end_blk + 1;
  				FDEV(i).end_blk = FDEV(i).start_blk +
  					(FDEV(i).total_segments <<
  					sbi->log_blocks_per_seg) - 1;
  			}
  			FDEV(i).bdev = blkdev_get_by_path(FDEV(i).path,
  					sbi->sb->s_mode, sbi->sb->s_type);
  		}
  		if (IS_ERR(FDEV(i).bdev))
  			return PTR_ERR(FDEV(i).bdev);
  
  		/* to release errored devices */
  		sbi->s_ndevs = i + 1;
  
  #ifdef CONFIG_BLK_DEV_ZONED
  		if (bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HM &&
  				!f2fs_sb_has_blkzoned(sbi)) {
  			f2fs_err(sbi, "Zoned block device feature not enabled\n");
  			return -EINVAL;
  		}
  		if (bdev_zoned_model(FDEV(i).bdev) != BLK_ZONED_NONE) {
  			if (init_blkz_info(sbi, i)) {
  				f2fs_err(sbi, "Failed to initialize F2FS blkzone information");
  				return -EINVAL;
  			}
  			if (max_devices == 1)
  				break;
  			f2fs_info(sbi, "Mount Device [%2d]: %20s, %8u, %8x - %8x (zone: %s)",
  				  i, FDEV(i).path,
  				  FDEV(i).total_segments,
  				  FDEV(i).start_blk, FDEV(i).end_blk,
  				  bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HA ?
  				  "Host-aware" : "Host-managed");
  			continue;
  		}
  #endif
  		f2fs_info(sbi, "Mount Device [%2d]: %20s, %8u, %8x - %8x",
  			  i, FDEV(i).path,
  			  FDEV(i).total_segments,
  			  FDEV(i).start_blk, FDEV(i).end_blk);
  	}
  	f2fs_info(sbi,
  		  "IO Block Size: %8d KB", F2FS_IO_SIZE_KB(sbi));
  	return 0;
  }
  
  static void f2fs_tuning_parameters(struct f2fs_sb_info *sbi)
  {
  	struct f2fs_sm_info *sm_i = SM_I(sbi);
  
  	/* adjust parameters according to the volume size */
  	if (sm_i->main_segments <= SMALL_VOLUME_SEGMENTS) {
  		F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_REUSE;
  		sm_i->dcc_info->discard_granularity = 1;
  		sm_i->ipu_policy = 1 << F2FS_IPU_FORCE;
  	}
  
  	sbi->readdir_ra = 1;
  }
  
  static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
  {
  	struct f2fs_sb_info *sbi;
  	struct f2fs_super_block *raw_super;
  	struct inode *root;
  	int err;
  	bool skip_recovery = false, need_fsck = false;
  	char *options = NULL;
  	int recovery, i, valid_super_block;
  	struct curseg_info *seg_i;
  	int retry_cnt = 1;
  
  try_onemore:
  	err = -EINVAL;
  	raw_super = NULL;
  	valid_super_block = -1;
  	recovery = 0;
  
  	/* allocate memory for f2fs-specific super block info */
  	sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
  	if (!sbi)
  		return -ENOMEM;
  
  	sbi->sb = sb;
  
  	/* Load the checksum driver */
  	sbi->s_chksum_driver = crypto_alloc_shash("crc32", 0, 0);
  	if (IS_ERR(sbi->s_chksum_driver)) {
  		f2fs_err(sbi, "Cannot load crc32 driver.");
  		err = PTR_ERR(sbi->s_chksum_driver);
  		sbi->s_chksum_driver = NULL;
  		goto free_sbi;
  	}
  
  	/* set a block size */
  	if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
  		f2fs_err(sbi, "unable to set blocksize");
  		goto free_sbi;
  	}
  
  	err = read_raw_super_block(sbi, &raw_super, &valid_super_block,
  								&recovery);
  	if (err)
  		goto free_sbi;
  
  	sb->s_fs_info = sbi;
  	sbi->raw_super = raw_super;
  
  	/* precompute checksum seed for metadata */
  	if (f2fs_sb_has_inode_chksum(sbi))
  		sbi->s_chksum_seed = f2fs_chksum(sbi, ~0, raw_super->uuid,
  						sizeof(raw_super->uuid));
  
  	/*
  	 * The BLKZONED feature indicates that the drive was formatted with
  	 * zone alignment optimization. This is optional for host-aware
  	 * devices, but mandatory for host-managed zoned block devices.
  	 */
  #ifndef CONFIG_BLK_DEV_ZONED
  	if (f2fs_sb_has_blkzoned(sbi)) {
  		f2fs_err(sbi, "Zoned block device support is not enabled");
  		err = -EOPNOTSUPP;
  		goto free_sb_buf;
  	}
  #endif
  	default_options(sbi);
  	/* parse mount options */
  	options = kstrdup((const char *)data, GFP_KERNEL);
  	if (data && !options) {
  		err = -ENOMEM;
  		goto free_sb_buf;
  	}
  
  	err = parse_options(sb, options);
  	if (err)
  		goto free_options;
  
  	sbi->max_file_blocks = max_file_blocks();
  	sb->s_maxbytes = sbi->max_file_blocks <<
  				le32_to_cpu(raw_super->log_blocksize);
  	sb->s_max_links = F2FS_LINK_MAX;
  
  #ifdef CONFIG_QUOTA
  	sb->dq_op = &f2fs_quota_operations;
  	sb->s_qcop = &f2fs_quotactl_ops;
  	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
  
  	if (f2fs_sb_has_quota_ino(sbi)) {
  		for (i = 0; i < MAXQUOTAS; i++) {
  			if (f2fs_qf_ino(sbi->sb, i))
  				sbi->nquota_files++;
  		}
  	}
  #endif
  
  	sb->s_op = &f2fs_sops;
  #ifdef CONFIG_FS_ENCRYPTION
  	sb->s_cop = &f2fs_cryptops;
  #endif
  	sb->s_xattr = f2fs_xattr_handlers;
  	sb->s_export_op = &f2fs_export_ops;
  	sb->s_magic = F2FS_SUPER_MAGIC;
  	sb->s_time_gran = 1;
  	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
  		(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
  	memcpy(&sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
  	sb->s_iflags |= SB_I_CGROUPWB;
  
  	/* init f2fs-specific super block info */
  	sbi->valid_super_block = valid_super_block;
  	mutex_init(&sbi->gc_mutex);
  	mutex_init(&sbi->writepages);
  	mutex_init(&sbi->cp_mutex);
  	mutex_init(&sbi->resize_mutex);
  	init_rwsem(&sbi->node_write);
  	init_rwsem(&sbi->node_change);
  
  	/* disallow all the data/node/meta page writes */
  	set_sbi_flag(sbi, SBI_POR_DOING);
  	spin_lock_init(&sbi->stat_lock);
  
  	/* init iostat info */
  	spin_lock_init(&sbi->iostat_lock);
  	sbi->iostat_enable = false;
  
  	for (i = 0; i < NR_PAGE_TYPE; i++) {
  		int n = (i == META) ? 1: NR_TEMP_TYPE;
  		int j;
  
  		sbi->write_io[i] =
  			f2fs_kmalloc(sbi,
  				     array_size(n,
  						sizeof(struct f2fs_bio_info)),
  				     GFP_KERNEL);
  		if (!sbi->write_io[i]) {
  			err = -ENOMEM;
  			goto free_bio_info;
  		}
  
  		for (j = HOT; j < n; j++) {
  			init_rwsem(&sbi->write_io[i][j].io_rwsem);
  			sbi->write_io[i][j].sbi = sbi;
  			sbi->write_io[i][j].bio = NULL;
  			spin_lock_init(&sbi->write_io[i][j].io_lock);
  			INIT_LIST_HEAD(&sbi->write_io[i][j].io_list);
  		}
  	}
  
  	init_rwsem(&sbi->cp_rwsem);
  	init_rwsem(&sbi->quota_sem);
  	init_waitqueue_head(&sbi->cp_wait);
  	init_sb_info(sbi);
  
  	err = init_percpu_info(sbi);
  	if (err)
  		goto free_bio_info;
  
  	if (F2FS_IO_SIZE(sbi) > 1) {
  		sbi->write_io_dummy =
  			mempool_create_page_pool(2 * (F2FS_IO_SIZE(sbi) - 1), 0);
  		if (!sbi->write_io_dummy) {
  			err = -ENOMEM;
  			goto free_percpu;
  		}
  	}
  
  	/* get an inode for meta space */
  	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
  	if (IS_ERR(sbi->meta_inode)) {
  		f2fs_err(sbi, "Failed to read F2FS meta data inode");
  		err = PTR_ERR(sbi->meta_inode);
  		goto free_io_dummy;
  	}
  
  	err = f2fs_get_valid_checkpoint(sbi);
  	if (err) {
  		f2fs_err(sbi, "Failed to get valid F2FS checkpoint");
  		goto free_meta_inode;
  	}
  
  	if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_QUOTA_NEED_FSCK_FLAG))
  		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
  	if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_DISABLED_QUICK_FLAG)) {
  		set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
  		sbi->interval_time[DISABLE_TIME] = DEF_DISABLE_QUICK_INTERVAL;
  	}
  
  	if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_FSCK_FLAG))
  		set_sbi_flag(sbi, SBI_NEED_FSCK);
  
  	/* Initialize device list */
  	err = f2fs_scan_devices(sbi);
  	if (err) {
  		f2fs_err(sbi, "Failed to find devices");
  		goto free_devices;
  	}
  
  	sbi->total_valid_node_count =
  				le32_to_cpu(sbi->ckpt->valid_node_count);
  	percpu_counter_set(&sbi->total_valid_inode_count,
  				le32_to_cpu(sbi->ckpt->valid_inode_count));
  	sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
  	sbi->total_valid_block_count =
  				le64_to_cpu(sbi->ckpt->valid_block_count);
  	sbi->last_valid_block_count = sbi->total_valid_block_count;
  	sbi->reserved_blocks = 0;
  	sbi->current_reserved_blocks = 0;
  	limit_reserve_root(sbi);
  
  	for (i = 0; i < NR_INODE_TYPE; i++) {
  		INIT_LIST_HEAD(&sbi->inode_list[i]);
  		spin_lock_init(&sbi->inode_lock[i]);
  	}
  	mutex_init(&sbi->flush_lock);
  
  	f2fs_init_extent_cache_info(sbi);
  
  	f2fs_init_ino_entry_info(sbi);
  
  	f2fs_init_fsync_node_info(sbi);
  
  	/* setup f2fs internal modules */
  	err = f2fs_build_segment_manager(sbi);
  	if (err) {
  		f2fs_err(sbi, "Failed to initialize F2FS segment manager (%d)",
  			 err);
  		goto free_sm;
  	}
  	err = f2fs_build_node_manager(sbi);
  	if (err) {
  		f2fs_err(sbi, "Failed to initialize F2FS node manager (%d)",
  			 err);
  		goto free_nm;
  	}
  
  	/* For write statistics */
  	if (sb->s_bdev->bd_part)
  		sbi->sectors_written_start =
  			(u64)part_stat_read(sb->s_bdev->bd_part, sectors[1]);
  
  	/* Read accumulated write IO statistics if exists */
  	seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
  	if (__exist_node_summaries(sbi))
  		sbi->kbytes_written =
  			le64_to_cpu(seg_i->journal->info.kbytes_written);
  
  	f2fs_build_gc_manager(sbi);
  
  	err = f2fs_build_stats(sbi);
  	if (err)
  		goto free_nm;
  
  	/* get an inode for node space */
  	sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
  	if (IS_ERR(sbi->node_inode)) {
  		f2fs_err(sbi, "Failed to read node inode");
  		err = PTR_ERR(sbi->node_inode);
  		goto free_stats;
  	}
  
  	/* read root inode and dentry */
  	root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
  	if (IS_ERR(root)) {
  		f2fs_err(sbi, "Failed to read root inode");
  		err = PTR_ERR(root);
  		goto free_node_inode;
  	}
  	if (!S_ISDIR(root->i_mode) || !root->i_blocks ||
  			!root->i_size || !root->i_nlink) {
  		iput(root);
  		err = -EINVAL;
  		goto free_node_inode;
  	}
  
  	sb->s_root = d_make_root(root); /* allocate root dentry */
  	if (!sb->s_root) {
  		err = -ENOMEM;
  		goto free_node_inode;
  	}
  
  	err = f2fs_register_sysfs(sbi);
  	if (err)
  		goto free_root_inode;
  
  #ifdef CONFIG_QUOTA
  	/* Enable quota usage during mount */
  	if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sb)) {
  		err = f2fs_enable_quotas(sb);
  		if (err)
  			f2fs_err(sbi, "Cannot turn on quotas: error %d", err);
  	}
  #endif
  	/* if there are nt orphan nodes free them */
  	err = f2fs_recover_orphan_inodes(sbi);
  	if (err)
  		goto free_meta;
  
  	if (unlikely(is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)))
  		goto reset_checkpoint;
  
  	/* recover fsynced data */
  	if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
  		/*
  		 * mount should be failed, when device has readonly mode, and
  		 * previous checkpoint was not done by clean system shutdown.
  		 */
  		if (f2fs_hw_is_readonly(sbi)) {
  			if (!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
  				err = -EROFS;
  				f2fs_err(sbi, "Need to recover fsync data, but write access unavailable");
  				goto free_meta;
  			}
  			f2fs_info(sbi, "write access unavailable, skipping recovery");
  			goto reset_checkpoint;
  		}
  
  		if (need_fsck)
  			set_sbi_flag(sbi, SBI_NEED_FSCK);
  
  		if (skip_recovery)
  			goto reset_checkpoint;
  
  		err = f2fs_recover_fsync_data(sbi, false);
  		if (err < 0) {
  			if (err != -ENOMEM)
  				skip_recovery = true;
  			need_fsck = true;
  			f2fs_err(sbi, "Cannot recover all fsync data errno=%d",
  				 err);
  			goto free_meta;
  		}
  	} else {
  		err = f2fs_recover_fsync_data(sbi, true);
  
  		if (!f2fs_readonly(sb) && err > 0) {
  			err = -EINVAL;
  			f2fs_err(sbi, "Need to recover fsync data");
  			goto free_meta;
  		}
  	}
  reset_checkpoint:
  	/* f2fs_recover_fsync_data() cleared this already */
  	clear_sbi_flag(sbi, SBI_POR_DOING);
  
  	if (test_opt(sbi, DISABLE_CHECKPOINT)) {
  		err = f2fs_disable_checkpoint(sbi);
  		if (err)
  			goto sync_free_meta;
  	} else if (is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)) {
  		f2fs_enable_checkpoint(sbi);
  	}
  
  	/*
  	 * If filesystem is not mounted as read-only then
  	 * do start the gc_thread.
  	 */
  	if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
  		/* After POR, we can run background GC thread.*/
  		err = f2fs_start_gc_thread(sbi);
  		if (err)
  			goto sync_free_meta;
  	}
  	kvfree(options);
  
  	/* recover broken superblock */
  	if (recovery) {
  		err = f2fs_commit_super(sbi, true);
  		f2fs_info(sbi, "Try to recover %dth superblock, ret: %d",
  			  sbi->valid_super_block ? 1 : 2, err);
  	}
  
  	f2fs_join_shrinker(sbi);
  
  	f2fs_tuning_parameters(sbi);
  
  	f2fs_notice(sbi, "Mounted with checkpoint version = %llx",
  		    cur_cp_version(F2FS_CKPT(sbi)));
  	f2fs_update_time(sbi, CP_TIME);
  	f2fs_update_time(sbi, REQ_TIME);
  	clear_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
  	return 0;
  
  sync_free_meta:
  	/* safe to flush all the data */
  	sync_filesystem(sbi->sb);
  	retry_cnt = 0;
  
  free_meta:
  #ifdef CONFIG_QUOTA
  	f2fs_truncate_quota_inode_pages(sb);
  	if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sb))
  		f2fs_quota_off_umount(sbi->sb);
  #endif
  	/*
  	 * Some dirty meta pages can be produced by f2fs_recover_orphan_inodes()
  	 * failed by EIO. Then, iput(node_inode) can trigger balance_fs_bg()
  	 * followed by f2fs_write_checkpoint() through f2fs_write_node_pages(), which
  	 * falls into an infinite loop in f2fs_sync_meta_pages().
  	 */
  	truncate_inode_pages_final(META_MAPPING(sbi));
  	/* evict some inodes being cached by GC */
  	evict_inodes(sb);
  	f2fs_unregister_sysfs(sbi);
  free_root_inode:
  	dput(sb->s_root);
  	sb->s_root = NULL;
  free_node_inode:
  	f2fs_release_ino_entry(sbi, true);
  	truncate_inode_pages_final(NODE_MAPPING(sbi));
  	iput(sbi->node_inode);
  	sbi->node_inode = NULL;
  free_stats:
  	f2fs_destroy_stats(sbi);
  free_nm:
  	f2fs_destroy_node_manager(sbi);
  free_sm:
  	f2fs_destroy_segment_manager(sbi);
  free_devices:
  	destroy_device_list(sbi);
  	kvfree(sbi->ckpt);
  free_meta_inode:
  	make_bad_inode(sbi->meta_inode);
  	iput(sbi->meta_inode);
  	sbi->meta_inode = NULL;
  free_io_dummy:
  	mempool_destroy(sbi->write_io_dummy);
  free_percpu:
  	destroy_percpu_info(sbi);
  free_bio_info:
  	for (i = 0; i < NR_PAGE_TYPE; i++)
  		kvfree(sbi->write_io[i]);
  free_options:
  #ifdef CONFIG_QUOTA
  	for (i = 0; i < MAXQUOTAS; i++)
  		kvfree(F2FS_OPTION(sbi).s_qf_names[i]);
  #endif
  	kvfree(options);
  free_sb_buf:
  	kvfree(raw_super);
  free_sbi:
  	if (sbi->s_chksum_driver)
  		crypto_free_shash(sbi->s_chksum_driver);
  	kvfree(sbi);
  
  	/* give only one another chance */
  	if (retry_cnt > 0 && skip_recovery) {
  		retry_cnt--;
  		shrink_dcache_sb(sb);
  		goto try_onemore;
  	}
  	return err;
  }
  
  static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
  			const char *dev_name, void *data)
  {
  	return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
  }
  
  static void kill_f2fs_super(struct super_block *sb)
  {
  	if (sb->s_root) {
  		struct f2fs_sb_info *sbi = F2FS_SB(sb);
  
  		set_sbi_flag(sbi, SBI_IS_CLOSE);
  		f2fs_stop_gc_thread(sbi);
  		f2fs_stop_discard_thread(sbi);
  
  		if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
  				!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
  			struct cp_control cpc = {
  				.reason = CP_UMOUNT,
  			};
  			f2fs_write_checkpoint(sbi, &cpc);
  		}
  
  		if (is_sbi_flag_set(sbi, SBI_IS_RECOVERED) && f2fs_readonly(sb))
  			sb->s_flags &= ~MS_RDONLY;
  	}
  	kill_block_super(sb);
  }
  
  static struct file_system_type f2fs_fs_type = {
  	.owner		= THIS_MODULE,
  	.name		= "f2fs",
  	.mount		= f2fs_mount,
  	.kill_sb	= kill_f2fs_super,
  	.fs_flags	= FS_REQUIRES_DEV,
  };
  MODULE_ALIAS_FS("f2fs");
  
  static int __init init_inodecache(void)
  {
  	f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache",
  			sizeof(struct f2fs_inode_info), 0,
  			SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL);
  	if (!f2fs_inode_cachep)
  		return -ENOMEM;
  	return 0;
  }
  
  static void destroy_inodecache(void)
  {
  	/*
  	 * Make sure all delayed rcu free inodes are flushed before we
  	 * destroy cache.
  	 */
  	rcu_barrier();
  	kmem_cache_destroy(f2fs_inode_cachep);
  }
  
  static int __init init_f2fs_fs(void)
  {
  	int err;
  
  	if (PAGE_SIZE != F2FS_BLKSIZE) {
  		printk("F2FS not supported on PAGE_SIZE(%lu) != %d\n",
  				PAGE_SIZE, F2FS_BLKSIZE);
  		return -EINVAL;
  	}
  
  	f2fs_build_trace_ios();
  
  	err = init_inodecache();
  	if (err)
  		goto fail;
  	err = f2fs_create_node_manager_caches();
  	if (err)
  		goto free_inodecache;
  	err = f2fs_create_segment_manager_caches();
  	if (err)
  		goto free_node_manager_caches;
  	err = f2fs_create_checkpoint_caches();
  	if (err)
  		goto free_segment_manager_caches;
  	err = f2fs_create_extent_cache();
  	if (err)
  		goto free_checkpoint_caches;
  	err = f2fs_init_sysfs();
  	if (err)
  		goto free_extent_cache;
  	err = register_shrinker(&f2fs_shrinker_info);
  	if (err)
  		goto free_sysfs;
  	err = register_filesystem(&f2fs_fs_type);
  	if (err)
  		goto free_shrinker;
  	f2fs_create_root_stats();
  	err = f2fs_init_post_read_processing();
  	if (err)
  		goto free_root_stats;
  	return 0;
  
  free_root_stats:
  	f2fs_destroy_root_stats();
  	unregister_filesystem(&f2fs_fs_type);
  free_shrinker:
  	unregister_shrinker(&f2fs_shrinker_info);
  free_sysfs:
  	f2fs_exit_sysfs();
  free_extent_cache:
  	f2fs_destroy_extent_cache();
  free_checkpoint_caches:
  	f2fs_destroy_checkpoint_caches();
  free_segment_manager_caches:
  	f2fs_destroy_segment_manager_caches();
  free_node_manager_caches:
  	f2fs_destroy_node_manager_caches();
  free_inodecache:
  	destroy_inodecache();
  fail:
  	return err;
  }
  
  static void __exit exit_f2fs_fs(void)
  {
  	f2fs_destroy_post_read_processing();
  	f2fs_destroy_root_stats();
  	unregister_filesystem(&f2fs_fs_type);
  	unregister_shrinker(&f2fs_shrinker_info);
  	f2fs_exit_sysfs();
  	f2fs_destroy_extent_cache();
  	f2fs_destroy_checkpoint_caches();
  	f2fs_destroy_segment_manager_caches();
  	f2fs_destroy_node_manager_caches();
  	destroy_inodecache();
  	f2fs_destroy_trace_ios();
  }
  
  module_init(init_f2fs_fs)
  module_exit(exit_f2fs_fs)
  
  MODULE_AUTHOR("Samsung Electronics's Praesto Team");
  MODULE_DESCRIPTION("Flash Friendly File System");
  MODULE_LICENSE("GPL");
  
  