Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4807 insertions, 0 deletions

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
new file mode 100644
index 000000000..3805162dc
--- /dev/null
+++ b/fs/f2fs/super.c
@@ -0,0 +1,4807 @@
+// 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/fs_context.h>
+#include <linux/sched/mm.h>
+#include <linux/statfs.h>
+#include <linux/buffer_head.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 <linux/unicode.h>
+#include <linux/part_stat.h>
+#include <linux/zstd.h>
+#include <linux/lz4.h>
+
+#include "f2fs.h"
+#include "node.h"
+#include "segment.h"
+#include "xattr.h"
+#include "gc.h"
+#include "iostat.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_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",
+	[FAULT_SLAB_ALLOC]	= "slab alloc",
+	[FAULT_DQUOT_INIT]	= "dquot initialize",
+	[FAULT_LOCK_OP]		= "lock_op",
+};
+
+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_alloc,
+	Opt_fsync,
+	Opt_test_dummy_encryption,
+	Opt_inlinecrypt,
+	Opt_checkpoint_disable,
+	Opt_checkpoint_disable_cap,
+	Opt_checkpoint_disable_cap_perc,
+	Opt_checkpoint_enable,
+	Opt_checkpoint_merge,
+	Opt_nocheckpoint_merge,
+	Opt_compress_algorithm,
+	Opt_compress_log_size,
+	Opt_compress_extension,
+	Opt_nocompress_extension,
+	Opt_compress_chksum,
+	Opt_compress_mode,
+	Opt_compress_cache,
+	Opt_atgc,
+	Opt_gc_merge,
+	Opt_nogc_merge,
+	Opt_discard_unit,
+	Opt_memory_mode,
+	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_alloc, "alloc_mode=%s"},
+	{Opt_fsync, "fsync_mode=%s"},
+	{Opt_test_dummy_encryption, "test_dummy_encryption=%s"},
+	{Opt_test_dummy_encryption, "test_dummy_encryption"},
+	{Opt_inlinecrypt, "inlinecrypt"},
+	{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_checkpoint_merge, "checkpoint_merge"},
+	{Opt_nocheckpoint_merge, "nocheckpoint_merge"},
+	{Opt_compress_algorithm, "compress_algorithm=%s"},
+	{Opt_compress_log_size, "compress_log_size=%u"},
+	{Opt_compress_extension, "compress_extension=%s"},
+	{Opt_nocompress_extension, "nocompress_extension=%s"},
+	{Opt_compress_chksum, "compress_chksum"},
+	{Opt_compress_mode, "compress_mode=%s"},
+	{Opt_compress_cache, "compress_cache"},
+	{Opt_atgc, "atgc"},
+	{Opt_gc_merge, "gc_merge"},
+	{Opt_nogc_merge, "nogc_merge"},
+	{Opt_discard_unit, "discard_unit=%s"},
+	{Opt_memory_mode, "memory=%s"},
+	{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);
+}
+
+#if IS_ENABLED(CONFIG_UNICODE)
+static const struct f2fs_sb_encodings {
+	__u16 magic;
+	char *name;
+	unsigned int version;
+} f2fs_sb_encoding_map[] = {
+	{F2FS_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
+};
+
+static const struct f2fs_sb_encodings *
+f2fs_sb_read_encoding(const struct f2fs_super_block *sb)
+{
+	__u16 magic = le16_to_cpu(sb->s_encoding);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(f2fs_sb_encoding_map); i++)
+		if (magic == f2fs_sb_encoding_map[i].magic)
+			return &f2fs_sb_encoding_map[i];
+
+	return NULL;
+}
+
+struct kmem_cache *f2fs_cf_name_slab;
+static int __init f2fs_create_casefold_cache(void)
+{
+	f2fs_cf_name_slab = f2fs_kmem_cache_create("f2fs_casefolded_name",
+							F2FS_NAME_LEN);
+	if (!f2fs_cf_name_slab)
+		return -ENOMEM;
+	return 0;
+}
+
+static void f2fs_destroy_casefold_cache(void)
+{
+	kmem_cache_destroy(f2fs_cf_name_slab);
+}
+#else
+static int __init f2fs_create_casefold_cache(void) { return 0; }
+static void f2fs_destroy_casefold_cache(void) { }
+#endif
+
+static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
+{
+	block_t limit = min((sbi->user_block_count >> 3),
+			sbi->user_block_count - sbi->reserved_blocks);
+
+	/* limit is 12.5% */
+	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 inline int adjust_reserved_segment(struct f2fs_sb_info *sbi)
+{
+	unsigned int sec_blks = sbi->blocks_per_seg * sbi->segs_per_sec;
+	unsigned int avg_vblocks;
+	unsigned int wanted_reserved_segments;
+	block_t avail_user_block_count;
+
+	if (!F2FS_IO_ALIGNED(sbi))
+		return 0;
+
+	/* average valid block count in section in worst case */
+	avg_vblocks = sec_blks / F2FS_IO_SIZE(sbi);
+
+	/*
+	 * we need enough free space when migrating one section in worst case
+	 */
+	wanted_reserved_segments = (F2FS_IO_SIZE(sbi) / avg_vblocks) *
+						reserved_segments(sbi);
+	wanted_reserved_segments -= reserved_segments(sbi);
+
+	avail_user_block_count = sbi->user_block_count -
+				sbi->current_reserved_blocks -
+				F2FS_OPTION(sbi).root_reserved_blocks;
+
+	if (wanted_reserved_segments * sbi->blocks_per_seg >
+					avail_user_block_count) {
+		f2fs_err(sbi, "IO align feature can't grab additional reserved segment: %u, available segments: %u",
+			wanted_reserved_segments,
+			avail_user_block_count >> sbi->log_blocks_per_seg);
+		return -ENOSPC;
+	}
+
+	SM_I(sbi)->additional_reserved_segments = wanted_reserved_segments;
+
+	f2fs_info(sbi, "IO align feature needs additional reserved segment: %u",
+			 wanted_reserved_segments);
+
+	return 0;
+}
+
+static inline void adjust_unusable_cap_perc(struct f2fs_sb_info *sbi)
+{
+	if (!F2FS_OPTION(sbi).unusable_cap_perc)
+		return;
+
+	if (F2FS_OPTION(sbi).unusable_cap_perc == 100)
+		F2FS_OPTION(sbi).unusable_cap = sbi->user_block_count;
+	else
+		F2FS_OPTION(sbi).unusable_cap = (sbi->user_block_count / 100) *
+					F2FS_OPTION(sbi).unusable_cap_perc;
+
+	f2fs_info(sbi, "Adjust unusable cap for checkpoint=disable = %u / %u%%",
+			F2FS_OPTION(sbi).unusable_cap,
+			F2FS_OPTION(sbi).unusable_cap_perc);
+}
+
+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:
+	kfree(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;
+	}
+	kfree(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 f2fs_set_test_dummy_encryption(struct super_block *sb,
+					  const char *opt,
+					  const substring_t *arg,
+					  bool is_remount)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct fs_parameter param = {
+		.type = fs_value_is_string,
+		.string = arg->from ? arg->from : "",
+	};
+	struct fscrypt_dummy_policy *policy =
+		&F2FS_OPTION(sbi).dummy_enc_policy;
+	int err;
+
+	if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) {
+		f2fs_warn(sbi, "test_dummy_encryption option not supported");
+		return -EINVAL;
+	}
+
+	if (!f2fs_sb_has_encrypt(sbi)) {
+		f2fs_err(sbi, "Encrypt feature is off");
+		return -EINVAL;
+	}
+
+	/*
+	 * This mount option is just for testing, and it's not worthwhile to
+	 * implement the extra complexity (e.g. RCU protection) that would be
+	 * needed to allow it to be set or changed during remount.  We do allow
+	 * it to be specified during remount, but only if there is no change.
+	 */
+	if (is_remount && !fscrypt_is_dummy_policy_set(policy)) {
+		f2fs_warn(sbi, "Can't set test_dummy_encryption on remount");
+		return -EINVAL;
+	}
+
+	err = fscrypt_parse_test_dummy_encryption(&param, policy);
+	if (err) {
+		if (err == -EEXIST)
+			f2fs_warn(sbi,
+				  "Can't change test_dummy_encryption on remount");
+		else if (err == -EINVAL)
+			f2fs_warn(sbi, "Value of option \"%s\" is unrecognized",
+				  opt);
+		else
+			f2fs_warn(sbi, "Error processing option \"%s\" [%d]",
+				  opt, err);
+		return -EINVAL;
+	}
+	err = fscrypt_add_test_dummy_key(sb, policy);
+	if (err) {
+		f2fs_warn(sbi, "Error adding test dummy encryption key [%d]",
+			  err);
+		return err;
+	}
+	f2fs_warn(sbi, "Test dummy encryption mode enabled");
+	return 0;
+}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+static bool is_compress_extension_exist(struct f2fs_sb_info *sbi,
+					const char *new_ext, bool is_ext)
+{
+	unsigned char (*ext)[F2FS_EXTENSION_LEN];
+	int ext_cnt;
+	int i;
+
+	if (is_ext) {
+		ext = F2FS_OPTION(sbi).extensions;
+		ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
+	} else {
+		ext = F2FS_OPTION(sbi).noextensions;
+		ext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
+	}
+
+	for (i = 0; i < ext_cnt; i++) {
+		if (!strcasecmp(new_ext, ext[i]))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * 1. The same extension name cannot not appear in both compress and non-compress extension
+ * at the same time.
+ * 2. If the compress extension specifies all files, the types specified by the non-compress
+ * extension will be treated as special cases and will not be compressed.
+ * 3. Don't allow the non-compress extension specifies all files.
+ */
+static int f2fs_test_compress_extension(struct f2fs_sb_info *sbi)
+{
+	unsigned char (*ext)[F2FS_EXTENSION_LEN];
+	unsigned char (*noext)[F2FS_EXTENSION_LEN];
+	int ext_cnt, noext_cnt, index = 0, no_index = 0;
+
+	ext = F2FS_OPTION(sbi).extensions;
+	ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
+	noext = F2FS_OPTION(sbi).noextensions;
+	noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
+
+	if (!noext_cnt)
+		return 0;
+
+	for (no_index = 0; no_index < noext_cnt; no_index++) {
+		if (!strcasecmp("*", noext[no_index])) {
+			f2fs_info(sbi, "Don't allow the nocompress extension specifies all files");
+			return -EINVAL;
+		}
+		for (index = 0; index < ext_cnt; index++) {
+			if (!strcasecmp(ext[index], noext[no_index])) {
+				f2fs_info(sbi, "Don't allow the same extension %s appear in both compress and nocompress extension",
+						ext[index]);
+				return -EINVAL;
+			}
+		}
+	}
+	return 0;
+}
+
+#ifdef CONFIG_F2FS_FS_LZ4
+static int f2fs_set_lz4hc_level(struct f2fs_sb_info *sbi, const char *str)
+{
+#ifdef CONFIG_F2FS_FS_LZ4HC
+	unsigned int level;
+
+	if (strlen(str) == 3) {
+		F2FS_OPTION(sbi).compress_level = 0;
+		return 0;
+	}
+
+	str += 3;
+
+	if (str[0] != ':') {
+		f2fs_info(sbi, "wrong format, e.g. <alg_name>:<compr_level>");
+		return -EINVAL;
+	}
+	if (kstrtouint(str + 1, 10, &level))
+		return -EINVAL;
+
+	if (level < LZ4HC_MIN_CLEVEL || level > LZ4HC_MAX_CLEVEL) {
+		f2fs_info(sbi, "invalid lz4hc compress level: %d", level);
+		return -EINVAL;
+	}
+
+	F2FS_OPTION(sbi).compress_level = level;
+	return 0;
+#else
+	if (strlen(str) == 3) {
+		F2FS_OPTION(sbi).compress_level = 0;
+		return 0;
+	}
+	f2fs_info(sbi, "kernel doesn't support lz4hc compression");
+	return -EINVAL;
+#endif
+}
+#endif
+
+#ifdef CONFIG_F2FS_FS_ZSTD
+static int f2fs_set_zstd_level(struct f2fs_sb_info *sbi, const char *str)
+{
+	unsigned int level;
+	int len = 4;
+
+	if (strlen(str) == len) {
+		F2FS_OPTION(sbi).compress_level = F2FS_ZSTD_DEFAULT_CLEVEL;
+		return 0;
+	}
+
+	str += len;
+
+	if (str[0] != ':') {
+		f2fs_info(sbi, "wrong format, e.g. <alg_name>:<compr_level>");
+		return -EINVAL;
+	}
+	if (kstrtouint(str + 1, 10, &level))
+		return -EINVAL;
+
+	if (level < zstd_min_clevel() || level > zstd_max_clevel()) {
+		f2fs_info(sbi, "invalid zstd compress level: %d", level);
+		return -EINVAL;
+	}
+
+	F2FS_OPTION(sbi).compress_level = level;
+	return 0;
+}
+#endif
+#endif
+
+static int parse_options(struct super_block *sb, char *options, bool is_remount)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	substring_t args[MAX_OPT_ARGS];
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	unsigned char (*ext)[F2FS_EXTENSION_LEN];
+	unsigned char (*noext)[F2FS_EXTENSION_LEN];
+	int ext_cnt, noext_cnt;
+#endif
+	char *p, *name;
+	int arg = 0;
+	kuid_t uid;
+	kgid_t gid;
+	int ret;
+
+	if (!options)
+		goto default_check;
+
+	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 (!strcmp(name, "on")) {
+				F2FS_OPTION(sbi).bggc_mode = BGGC_MODE_ON;
+			} else if (!strcmp(name, "off")) {
+				F2FS_OPTION(sbi).bggc_mode = BGGC_MODE_OFF;
+			} else if (!strcmp(name, "sync")) {
+				F2FS_OPTION(sbi).bggc_mode = BGGC_MODE_SYNC;
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(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, NORECOVERY);
+			if (!f2fs_readonly(sb))
+				return -EINVAL;
+			break;
+		case Opt_discard:
+			if (!f2fs_hw_support_discard(sbi)) {
+				f2fs_warn(sbi, "device does not support discard");
+				break;
+			}
+			set_opt(sbi, DISCARD);
+			break;
+		case Opt_nodiscard:
+			if (f2fs_hw_should_discard(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_PERSIST_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, READ_EXTENT_CACHE);
+			break;
+		case Opt_noextent_cache:
+			clear_opt(sbi, READ_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 (!strcmp(name, "adaptive")) {
+				F2FS_OPTION(sbi).fs_mode = FS_MODE_ADAPTIVE;
+			} else if (!strcmp(name, "lfs")) {
+				F2FS_OPTION(sbi).fs_mode = FS_MODE_LFS;
+			} else if (!strcmp(name, "fragment:segment")) {
+				F2FS_OPTION(sbi).fs_mode = FS_MODE_FRAGMENT_SEG;
+			} else if (!strcmp(name, "fragment:block")) {
+				F2FS_OPTION(sbi).fs_mode = FS_MODE_FRAGMENT_BLK;
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			break;
+		case Opt_io_size_bits:
+			if (args->from && match_int(args, &arg))
+				return -EINVAL;
+			if (arg <= 0 || arg > __ilog2_u32(BIO_MAX_VECS)) {
+				f2fs_warn(sbi, "Not support %ld, larger than %d",
+					BIT(arg), BIO_MAX_VECS);
+				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 |= SB_LAZYTIME;
+			break;
+		case Opt_nolazytime:
+			sb->s_flags &= ~SB_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_alloc:
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+
+			if (!strcmp(name, "default")) {
+				F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
+			} else if (!strcmp(name, "reuse")) {
+				F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_REUSE;
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			break;
+		case Opt_fsync:
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+			if (!strcmp(name, "posix")) {
+				F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
+			} else if (!strcmp(name, "strict")) {
+				F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_STRICT;
+			} else if (!strcmp(name, "nobarrier")) {
+				F2FS_OPTION(sbi).fsync_mode =
+							FSYNC_MODE_NOBARRIER;
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			break;
+		case Opt_test_dummy_encryption:
+			ret = f2fs_set_test_dummy_encryption(sb, p, &args[0],
+							     is_remount);
+			if (ret)
+				return ret;
+			break;
+		case Opt_inlinecrypt:
+#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
+			sb->s_flags |= SB_INLINECRYPT;
+#else
+			f2fs_info(sbi, "inline encryption not supported");
+#endif
+			break;
+		case Opt_checkpoint_disable_cap_perc:
+			if (args->from && match_int(args, &arg))
+				return -EINVAL;
+			if (arg < 0 || arg > 100)
+				return -EINVAL;
+			F2FS_OPTION(sbi).unusable_cap_perc = 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;
+		case Opt_checkpoint_merge:
+			set_opt(sbi, MERGE_CHECKPOINT);
+			break;
+		case Opt_nocheckpoint_merge:
+			clear_opt(sbi, MERGE_CHECKPOINT);
+			break;
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+		case Opt_compress_algorithm:
+			if (!f2fs_sb_has_compression(sbi)) {
+				f2fs_info(sbi, "Image doesn't support compression");
+				break;
+			}
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+			if (!strcmp(name, "lzo")) {
+#ifdef CONFIG_F2FS_FS_LZO
+				F2FS_OPTION(sbi).compress_level = 0;
+				F2FS_OPTION(sbi).compress_algorithm =
+								COMPRESS_LZO;
+#else
+				f2fs_info(sbi, "kernel doesn't support lzo compression");
+#endif
+			} else if (!strncmp(name, "lz4", 3)) {
+#ifdef CONFIG_F2FS_FS_LZ4
+				ret = f2fs_set_lz4hc_level(sbi, name);
+				if (ret) {
+					kfree(name);
+					return -EINVAL;
+				}
+				F2FS_OPTION(sbi).compress_algorithm =
+								COMPRESS_LZ4;
+#else
+				f2fs_info(sbi, "kernel doesn't support lz4 compression");
+#endif
+			} else if (!strncmp(name, "zstd", 4)) {
+#ifdef CONFIG_F2FS_FS_ZSTD
+				ret = f2fs_set_zstd_level(sbi, name);
+				if (ret) {
+					kfree(name);
+					return -EINVAL;
+				}
+				F2FS_OPTION(sbi).compress_algorithm =
+								COMPRESS_ZSTD;
+#else
+				f2fs_info(sbi, "kernel doesn't support zstd compression");
+#endif
+			} else if (!strcmp(name, "lzo-rle")) {
+#ifdef CONFIG_F2FS_FS_LZORLE
+				F2FS_OPTION(sbi).compress_level = 0;
+				F2FS_OPTION(sbi).compress_algorithm =
+								COMPRESS_LZORLE;
+#else
+				f2fs_info(sbi, "kernel doesn't support lzorle compression");
+#endif
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			break;
+		case Opt_compress_log_size:
+			if (!f2fs_sb_has_compression(sbi)) {
+				f2fs_info(sbi, "Image doesn't support compression");
+				break;
+			}
+			if (args->from && match_int(args, &arg))
+				return -EINVAL;
+			if (arg < MIN_COMPRESS_LOG_SIZE ||
+				arg > MAX_COMPRESS_LOG_SIZE) {
+				f2fs_err(sbi,
+					"Compress cluster log size is out of range");
+				return -EINVAL;
+			}
+			F2FS_OPTION(sbi).compress_log_size = arg;
+			break;
+		case Opt_compress_extension:
+			if (!f2fs_sb_has_compression(sbi)) {
+				f2fs_info(sbi, "Image doesn't support compression");
+				break;
+			}
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+
+			ext = F2FS_OPTION(sbi).extensions;
+			ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
+
+			if (strlen(name) >= F2FS_EXTENSION_LEN ||
+				ext_cnt >= COMPRESS_EXT_NUM) {
+				f2fs_err(sbi,
+					"invalid extension length/number");
+				kfree(name);
+				return -EINVAL;
+			}
+
+			if (is_compress_extension_exist(sbi, name, true)) {
+				kfree(name);
+				break;
+			}
+
+			strcpy(ext[ext_cnt], name);
+			F2FS_OPTION(sbi).compress_ext_cnt++;
+			kfree(name);
+			break;
+		case Opt_nocompress_extension:
+			if (!f2fs_sb_has_compression(sbi)) {
+				f2fs_info(sbi, "Image doesn't support compression");
+				break;
+			}
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+
+			noext = F2FS_OPTION(sbi).noextensions;
+			noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
+
+			if (strlen(name) >= F2FS_EXTENSION_LEN ||
+				noext_cnt >= COMPRESS_EXT_NUM) {
+				f2fs_err(sbi,
+					"invalid extension length/number");
+				kfree(name);
+				return -EINVAL;
+			}
+
+			if (is_compress_extension_exist(sbi, name, false)) {
+				kfree(name);
+				break;
+			}
+
+			strcpy(noext[noext_cnt], name);
+			F2FS_OPTION(sbi).nocompress_ext_cnt++;
+			kfree(name);
+			break;
+		case Opt_compress_chksum:
+			F2FS_OPTION(sbi).compress_chksum = true;
+			break;
+		case Opt_compress_mode:
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+			if (!strcmp(name, "fs")) {
+				F2FS_OPTION(sbi).compress_mode = COMPR_MODE_FS;
+			} else if (!strcmp(name, "user")) {
+				F2FS_OPTION(sbi).compress_mode = COMPR_MODE_USER;
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			break;
+		case Opt_compress_cache:
+			set_opt(sbi, COMPRESS_CACHE);
+			break;
+#else
+		case Opt_compress_algorithm:
+		case Opt_compress_log_size:
+		case Opt_compress_extension:
+		case Opt_nocompress_extension:
+		case Opt_compress_chksum:
+		case Opt_compress_mode:
+		case Opt_compress_cache:
+			f2fs_info(sbi, "compression options not supported");
+			break;
+#endif
+		case Opt_atgc:
+			set_opt(sbi, ATGC);
+			break;
+		case Opt_gc_merge:
+			set_opt(sbi, GC_MERGE);
+			break;
+		case Opt_nogc_merge:
+			clear_opt(sbi, GC_MERGE);
+			break;
+		case Opt_discard_unit:
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+			if (!strcmp(name, "block")) {
+				F2FS_OPTION(sbi).discard_unit =
+						DISCARD_UNIT_BLOCK;
+			} else if (!strcmp(name, "segment")) {
+				F2FS_OPTION(sbi).discard_unit =
+						DISCARD_UNIT_SEGMENT;
+			} else if (!strcmp(name, "section")) {
+				F2FS_OPTION(sbi).discard_unit =
+						DISCARD_UNIT_SECTION;
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			break;
+		case Opt_memory_mode:
+			name = match_strdup(&args[0]);
+			if (!name)
+				return -ENOMEM;
+			if (!strcmp(name, "normal")) {
+				F2FS_OPTION(sbi).memory_mode =
+						MEMORY_MODE_NORMAL;
+			} else if (!strcmp(name, "low")) {
+				F2FS_OPTION(sbi).memory_mode =
+						MEMORY_MODE_LOW;
+			} else {
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			break;
+		default:
+			f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
+				 p);
+			return -EINVAL;
+		}
+	}
+default_check:
+#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 !IS_ENABLED(CONFIG_UNICODE)
+	if (f2fs_sb_has_casefold(sbi)) {
+		f2fs_err(sbi,
+			"Filesystem with casefold feature cannot be mounted without CONFIG_UNICODE");
+		return -EINVAL;
+	}
+#endif
+	/*
+	 * 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.
+	 */
+	if (f2fs_sb_has_blkzoned(sbi)) {
+#ifdef CONFIG_BLK_DEV_ZONED
+		if (F2FS_OPTION(sbi).discard_unit !=
+						DISCARD_UNIT_SECTION) {
+			f2fs_info(sbi, "Zoned block device doesn't need small discard, set discard_unit=section by default");
+			F2FS_OPTION(sbi).discard_unit =
+					DISCARD_UNIT_SECTION;
+		}
+
+		if (F2FS_OPTION(sbi).fs_mode != FS_MODE_LFS) {
+			f2fs_info(sbi, "Only lfs mode is allowed with zoned block device feature");
+			return -EINVAL;
+		}
+#else
+		f2fs_err(sbi, "Zoned block device support is not enabled");
+		return -EINVAL;
+#endif
+	}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (f2fs_test_compress_extension(sbi)) {
+		f2fs_err(sbi, "invalid compress or nocompress extension");
+		return -EINVAL;
+	}
+#endif
+
+	if (F2FS_IO_SIZE_BITS(sbi) && !f2fs_lfs_mode(sbi)) {
+		f2fs_err(sbi, "Should set mode=lfs with %luKB-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) && f2fs_lfs_mode(sbi)) {
+		f2fs_err(sbi, "LFS not compatible with checkpoint=disable");
+		return -EINVAL;
+	}
+
+	if (test_opt(sbi, ATGC) && f2fs_lfs_mode(sbi)) {
+		f2fs_err(sbi, "LFS not compatible with ATGC");
+		return -EINVAL;
+	}
+
+	if (f2fs_sb_has_readonly(sbi) && !f2fs_readonly(sbi->sb)) {
+		f2fs_err(sbi, "Allow to mount readonly mode only");
+		return -EROFS;
+	}
+	return 0;
+}
+
+static struct inode *f2fs_alloc_inode(struct super_block *sb)
+{
+	struct f2fs_inode_info *fi;
+
+	if (time_to_inject(F2FS_SB(sb), FAULT_SLAB_ALLOC)) {
+		f2fs_show_injection_info(F2FS_SB(sb), FAULT_SLAB_ALLOC);
+		return NULL;
+	}
+
+	fi = alloc_inode_sb(sb, 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);
+	atomic_set(&fi->i_compr_blocks, 0);
+	init_f2fs_rwsem(&fi->i_sem);
+	spin_lock_init(&fi->i_size_lock);
+	INIT_LIST_HEAD(&fi->dirty_list);
+	INIT_LIST_HEAD(&fi->gdirty_list);
+	init_f2fs_rwsem(&fi->i_gc_rwsem[READ]);
+	init_f2fs_rwsem(&fi->i_gc_rwsem[WRITE]);
+	init_f2fs_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);
+
+			/* 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);
+	if (!ret)
+		ret = fscrypt_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 (is_inode_flag_set(inode, FI_AUTO_RECOVER))
+		clear_inode_flag(inode, FI_AUTO_RECOVER);
+
+	f2fs_inode_dirtied(inode, false);
+}
+
+static void f2fs_free_inode(struct inode *inode)
+{
+	fscrypt_free_inode(inode);
+	kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
+}
+
+static void destroy_percpu_info(struct f2fs_sb_info *sbi)
+{
+	percpu_counter_destroy(&sbi->total_valid_inode_count);
+	percpu_counter_destroy(&sbi->rf_node_block_count);
+	percpu_counter_destroy(&sbi->alloc_valid_block_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;
+
+	/* unregister procfs/sysfs entries in advance to avoid race case */
+	f2fs_unregister_sysfs(sbi);
+
+	f2fs_quota_off_umount(sb);
+
+	/* prevent remaining shrinker jobs */
+	mutex_lock(&sbi->umount_mutex);
+
+	/*
+	 * flush all issued checkpoints and stop checkpoint issue thread.
+	 * after then, all checkpoints should be done by each process context.
+	 */
+	f2fs_stop_ckpt_thread(sbi);
+
+	/*
+	 * 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(sbi, F2FS_WB_CP_DATA);
+
+	f2fs_bug_on(sbi, sbi->fsync_node_num);
+
+	f2fs_destroy_compress_inode(sbi);
+
+	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);
+
+	f2fs_destroy_post_read_wq(sbi);
+
+	kvfree(sbi->ckpt);
+
+	sb->s_fs_info = NULL;
+	if (sbi->s_chksum_driver)
+		crypto_free_shash(sbi->s_chksum_driver);
+	kfree(sbi->raw_super);
+
+	destroy_device_list(sbi);
+	f2fs_destroy_page_array_cache(sbi);
+	f2fs_destroy_xattr_caches(sbi);
+	mempool_destroy(sbi->write_io_dummy);
+#ifdef CONFIG_QUOTA
+	for (i = 0; i < MAXQUOTAS; i++)
+		kfree(F2FS_OPTION(sbi).s_qf_names[i]);
+#endif
+	fscrypt_free_dummy_policy(&F2FS_OPTION(sbi).dummy_enc_policy);
+	destroy_percpu_info(sbi);
+	f2fs_destroy_iostat(sbi);
+	for (i = 0; i < NR_PAGE_TYPE; i++)
+		kvfree(sbi->write_io[i]);
+#if IS_ENABLED(CONFIG_UNICODE)
+	utf8_unload(sb->s_encoding);
+#endif
+	kfree(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)
+		err = f2fs_issue_checkpoint(sbi);
+
+	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;
+
+	/* Let's flush checkpoints and stop the thread. */
+	f2fs_flush_ckpt_thread(F2FS_SB(sb));
+
+	/* to avoid deadlock on f2fs_evict_inode->SB_FREEZE_FS */
+	set_sbi_flag(F2FS_SB(sb), SBI_IS_FREEZING);
+	return 0;
+}
+
+static int f2fs_unfreeze(struct super_block *sb)
+{
+	clear_sbi_flag(F2FS_SB(sb), SBI_IS_FREEZING);
+	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(&dquot->dq_dqb_lock);
+
+	limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
+					dquot->dq_dqb.dqb_bhardlimit);
+	if (limit)
+		limit >>= sb->s_blocksize_bits;
+
+	if (limit && buf->f_blocks > limit) {
+		curblock = (dquot->dq_dqb.dqb_curspace +
+			    dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
+		buf->f_blocks = limit;
+		buf->f_bfree = buf->f_bavail =
+			(buf->f_blocks > curblock) ?
+			 (buf->f_blocks - curblock) : 0;
+	}
+
+	limit = min_not_zero(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(&dquot->dq_dqb_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;
+	unsigned int total_valid_node_count;
+
+	total_count = le64_to_cpu(sbi->raw_super->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;
+
+	spin_lock(&sbi->stat_lock);
+
+	user_block_count = sbi->user_block_count;
+	total_valid_node_count = valid_node_count(sbi);
+	avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
+	buf->f_bfree = user_block_count - valid_user_blocks(sbi) -
+						sbi->current_reserved_blocks;
+
+	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;
+
+	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 - total_valid_node_count,
+					buf->f_bavail);
+	}
+
+	buf->f_namelen = F2FS_NAME_LEN;
+	buf->f_fsid    = u64_to_fsid(id);
+
+#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
+}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+static inline void f2fs_show_compress_options(struct seq_file *seq,
+							struct super_block *sb)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	char *algtype = "";
+	int i;
+
+	if (!f2fs_sb_has_compression(sbi))
+		return;
+
+	switch (F2FS_OPTION(sbi).compress_algorithm) {
+	case COMPRESS_LZO:
+		algtype = "lzo";
+		break;
+	case COMPRESS_LZ4:
+		algtype = "lz4";
+		break;
+	case COMPRESS_ZSTD:
+		algtype = "zstd";
+		break;
+	case COMPRESS_LZORLE:
+		algtype = "lzo-rle";
+		break;
+	}
+	seq_printf(seq, ",compress_algorithm=%s", algtype);
+
+	if (F2FS_OPTION(sbi).compress_level)
+		seq_printf(seq, ":%d", F2FS_OPTION(sbi).compress_level);
+
+	seq_printf(seq, ",compress_log_size=%u",
+			F2FS_OPTION(sbi).compress_log_size);
+
+	for (i = 0; i < F2FS_OPTION(sbi).compress_ext_cnt; i++) {
+		seq_printf(seq, ",compress_extension=%s",
+			F2FS_OPTION(sbi).extensions[i]);
+	}
+
+	for (i = 0; i < F2FS_OPTION(sbi).nocompress_ext_cnt; i++) {
+		seq_printf(seq, ",nocompress_extension=%s",
+			F2FS_OPTION(sbi).noextensions[i]);
+	}
+
+	if (F2FS_OPTION(sbi).compress_chksum)
+		seq_puts(seq, ",compress_chksum");
+
+	if (F2FS_OPTION(sbi).compress_mode == COMPR_MODE_FS)
+		seq_printf(seq, ",compress_mode=%s", "fs");
+	else if (F2FS_OPTION(sbi).compress_mode == COMPR_MODE_USER)
+		seq_printf(seq, ",compress_mode=%s", "user");
+
+	if (test_opt(sbi, COMPRESS_CACHE))
+		seq_puts(seq, ",compress_cache");
+}
+#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_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC)
+		seq_printf(seq, ",background_gc=%s", "sync");
+	else if (F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_ON)
+		seq_printf(seq, ",background_gc=%s", "on");
+	else if (F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_OFF)
+		seq_printf(seq, ",background_gc=%s", "off");
+
+	if (test_opt(sbi, GC_MERGE))
+		seq_puts(seq, ",gc_merge");
+
+	if (test_opt(sbi, DISABLE_ROLL_FORWARD))
+		seq_puts(seq, ",disable_roll_forward");
+	if (test_opt(sbi, NORECOVERY))
+		seq_puts(seq, ",norecovery");
+	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, READ_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 (F2FS_OPTION(sbi).fs_mode == FS_MODE_ADAPTIVE)
+		seq_puts(seq, "adaptive");
+	else if (F2FS_OPTION(sbi).fs_mode == FS_MODE_LFS)
+		seq_puts(seq, "lfs");
+	else if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_SEG)
+		seq_puts(seq, "fragment:segment");
+	else if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK)
+		seq_puts(seq, "fragment:block");
+	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);
+
+	fscrypt_show_test_dummy_encryption(seq, ',', sbi->sb);
+
+	if (sbi->sb->s_flags & SB_INLINECRYPT)
+		seq_puts(seq, ",inlinecrypt");
+
+	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 (test_opt(sbi, MERGE_CHECKPOINT))
+		seq_puts(seq, ",checkpoint_merge");
+	else
+		seq_puts(seq, ",nocheckpoint_merge");
+	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");
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	f2fs_show_compress_options(seq, sbi->sb);
+#endif
+
+	if (test_opt(sbi, ATGC))
+		seq_puts(seq, ",atgc");
+
+	if (F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_BLOCK)
+		seq_printf(seq, ",discard_unit=%s", "block");
+	else if (F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_SEGMENT)
+		seq_printf(seq, ",discard_unit=%s", "segment");
+	else if (F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_SECTION)
+		seq_printf(seq, ",discard_unit=%s", "section");
+
+	if (F2FS_OPTION(sbi).memory_mode == MEMORY_MODE_NORMAL)
+		seq_printf(seq, ",memory=%s", "normal");
+	else if (F2FS_OPTION(sbi).memory_mode == MEMORY_MODE_LOW)
+		seq_printf(seq, ",memory=%s", "low");
+
+	return 0;
+}
+
+static void default_options(struct f2fs_sb_info *sbi)
+{
+	/* init some FS parameters */
+	if (f2fs_sb_has_readonly(sbi))
+		F2FS_OPTION(sbi).active_logs = NR_CURSEG_RO_TYPE;
+	else
+		F2FS_OPTION(sbi).active_logs = NR_CURSEG_PERSIST_TYPE;
+
+	F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
+	F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
+	F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_POSIX;
+	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);
+	F2FS_OPTION(sbi).compress_algorithm = COMPRESS_LZ4;
+	F2FS_OPTION(sbi).compress_log_size = MIN_COMPRESS_LOG_SIZE;
+	F2FS_OPTION(sbi).compress_ext_cnt = 0;
+	F2FS_OPTION(sbi).compress_mode = COMPR_MODE_FS;
+	F2FS_OPTION(sbi).bggc_mode = BGGC_MODE_ON;
+	F2FS_OPTION(sbi).memory_mode = MEMORY_MODE_NORMAL;
+
+	sbi->sb->s_flags &= ~SB_INLINECRYPT;
+
+	set_opt(sbi, INLINE_XATTR);
+	set_opt(sbi, INLINE_DATA);
+	set_opt(sbi, INLINE_DENTRY);
+	set_opt(sbi, READ_EXTENT_CACHE);
+	set_opt(sbi, NOHEAP);
+	clear_opt(sbi, DISABLE_CHECKPOINT);
+	set_opt(sbi, MERGE_CHECKPOINT);
+	F2FS_OPTION(sbi).unusable_cap = 0;
+	sbi->sb->s_flags |= SB_LAZYTIME;
+	set_opt(sbi, FLUSH_MERGE);
+	if (f2fs_hw_support_discard(sbi) || f2fs_hw_should_discard(sbi))
+		set_opt(sbi, DISCARD);
+	if (f2fs_sb_has_blkzoned(sbi)) {
+		F2FS_OPTION(sbi).fs_mode = FS_MODE_LFS;
+		F2FS_OPTION(sbi).discard_unit = DISCARD_UNIT_SECTION;
+	} else {
+		F2FS_OPTION(sbi).fs_mode = FS_MODE_ADAPTIVE;
+		F2FS_OPTION(sbi).discard_unit = DISCARD_UNIT_BLOCK;
+	}
+
+#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;
+	unsigned int gc_mode = sbi->gc_mode;
+	int err = 0;
+	int ret;
+	block_t unusable;
+
+	if (s_flags & SB_RDONLY) {
+		f2fs_err(sbi, "checkpoint=disable on readonly fs");
+		return -EINVAL;
+	}
+	sbi->sb->s_flags |= SB_ACTIVE;
+
+	/* check if we need more GC first */
+	unusable = f2fs_get_unusable_blocks(sbi);
+	if (!f2fs_disable_cp_again(sbi, unusable))
+		goto skip_gc;
+
+	f2fs_update_time(sbi, DISABLE_TIME);
+
+	sbi->gc_mode = GC_URGENT_HIGH;
+
+	while (!f2fs_time_over(sbi, DISABLE_TIME)) {
+		struct f2fs_gc_control gc_control = {
+			.victim_segno = NULL_SEGNO,
+			.init_gc_type = FG_GC,
+			.should_migrate_blocks = false,
+			.err_gc_skipped = true,
+			.nr_free_secs = 1 };
+
+		f2fs_down_write(&sbi->gc_lock);
+		err = f2fs_gc(sbi, &gc_control);
+		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;
+	}
+
+skip_gc:
+	f2fs_down_write(&sbi->gc_lock);
+	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:
+	f2fs_up_write(&sbi->gc_lock);
+restore_flag:
+	sbi->gc_mode = gc_mode;
+	sbi->sb->s_flags = s_flags;	/* Restore SB_RDONLY status */
+	return err;
+}
+
+static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
+{
+	int retry = DEFAULT_RETRY_IO_COUNT;
+
+	/* we should flush all the data to keep data consistency */
+	do {
+		sync_inodes_sb(sbi->sb);
+		f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
+	} while (get_pages(sbi, F2FS_DIRTY_DATA) && retry--);
+
+	if (unlikely(retry < 0))
+		f2fs_warn(sbi, "checkpoint=enable has some unwritten data.");
+
+	f2fs_down_write(&sbi->gc_lock);
+	f2fs_dirty_to_prefree(sbi);
+
+	clear_sbi_flag(sbi, SBI_CP_DISABLED);
+	set_sbi_flag(sbi, SBI_IS_DIRTY);
+	f2fs_up_write(&sbi->gc_lock);
+
+	f2fs_sync_fs(sbi->sb, 1);
+
+	/* Let's ensure there's no pending checkpoint anymore */
+	f2fs_flush_ckpt_thread(sbi);
+}
+
+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, need_stop_gc = false;
+	bool need_restart_ckpt = false, need_stop_ckpt = false;
+	bool need_restart_flush = false, need_stop_flush = false;
+	bool need_restart_discard = false, need_stop_discard = false;
+	bool no_read_extent_cache = !test_opt(sbi, READ_EXTENT_CACHE);
+	bool enable_checkpoint = !test_opt(sbi, DISABLE_CHECKPOINT);
+	bool no_io_align = !F2FS_IO_ALIGNED(sbi);
+	bool no_atgc = !test_opt(sbi, ATGC);
+	bool no_discard = !test_opt(sbi, DISCARD);
+	bool no_compress_cache = !test_opt(sbi, COMPRESS_CACHE);
+	bool block_unit_discard = f2fs_block_unit_discard(sbi);
+	struct discard_cmd_control *dcc;
+#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++)
+					kfree(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 & SB_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, true);
+	if (err)
+		goto restore_opts;
+
+	/*
+	 * Previous and new state of filesystem is RO,
+	 * so skip checking GC and FLUSH_MERGE conditions.
+	 */
+	if (f2fs_readonly(sb) && (*flags & SB_RDONLY))
+		goto skip;
+
+	if (f2fs_dev_is_readonly(sbi) && !(*flags & SB_RDONLY)) {
+		err = -EROFS;
+		goto restore_opts;
+	}
+
+#ifdef CONFIG_QUOTA
+	if (!f2fs_readonly(sb) && (*flags & SB_RDONLY)) {
+		err = dquot_suspend(sb, -1);
+		if (err < 0)
+			goto restore_opts;
+	} else if (f2fs_readonly(sb) && !(*flags & SB_RDONLY)) {
+		/* dquot_resume needs RW */
+		sb->s_flags &= ~SB_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 atgc dynamically */
+	if (no_atgc == !!test_opt(sbi, ATGC)) {
+		err = -EINVAL;
+		f2fs_warn(sbi, "switch atgc option is not allowed");
+		goto restore_opts;
+	}
+
+	/* disallow enable/disable extent_cache dynamically */
+	if (no_read_extent_cache == !!test_opt(sbi, READ_EXTENT_CACHE)) {
+		err = -EINVAL;
+		f2fs_warn(sbi, "switch extent_cache option is not allowed");
+		goto restore_opts;
+	}
+
+	if (no_io_align == !!F2FS_IO_ALIGNED(sbi)) {
+		err = -EINVAL;
+		f2fs_warn(sbi, "switch io_bits option is not allowed");
+		goto restore_opts;
+	}
+
+	if (no_compress_cache == !!test_opt(sbi, COMPRESS_CACHE)) {
+		err = -EINVAL;
+		f2fs_warn(sbi, "switch compress_cache option is not allowed");
+		goto restore_opts;
+	}
+
+	if (block_unit_discard != f2fs_block_unit_discard(sbi)) {
+		err = -EINVAL;
+		f2fs_warn(sbi, "switch discard_unit option is not allowed");
+		goto restore_opts;
+	}
+
+	if ((*flags & SB_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 & SB_RDONLY) ||
+			(F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_OFF &&
+			!test_opt(sbi, GC_MERGE))) {
+		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 & SB_RDONLY) {
+		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 ((*flags & SB_RDONLY) || test_opt(sbi, DISABLE_CHECKPOINT) ||
+			!test_opt(sbi, MERGE_CHECKPOINT)) {
+		f2fs_stop_ckpt_thread(sbi);
+		need_restart_ckpt = true;
+	} else {
+		/* Flush if the prevous checkpoint, if exists. */
+		f2fs_flush_ckpt_thread(sbi);
+
+		err = f2fs_start_ckpt_thread(sbi);
+		if (err) {
+			f2fs_err(sbi,
+			    "Failed to start F2FS issue_checkpoint_thread (%d)",
+			    err);
+			goto restore_gc;
+		}
+		need_stop_ckpt = true;
+	}
+
+	/*
+	 * We stop issue flush thread if FS is mounted as RO
+	 * or if flush_merge is not passed in mount option.
+	 */
+	if ((*flags & SB_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
+		clear_opt(sbi, FLUSH_MERGE);
+		f2fs_destroy_flush_cmd_control(sbi, false);
+		need_restart_flush = true;
+	} else {
+		err = f2fs_create_flush_cmd_control(sbi);
+		if (err)
+			goto restore_ckpt;
+		need_stop_flush = true;
+	}
+
+	if (no_discard == !!test_opt(sbi, DISCARD)) {
+		if (test_opt(sbi, DISCARD)) {
+			err = f2fs_start_discard_thread(sbi);
+			if (err)
+				goto restore_flush;
+			need_stop_discard = true;
+		} else {
+			dcc = SM_I(sbi)->dcc_info;
+			f2fs_stop_discard_thread(sbi);
+			if (atomic_read(&dcc->discard_cmd_cnt))
+				f2fs_issue_discard_timeout(sbi);
+			need_restart_discard = true;
+		}
+	}
+
+	if (enable_checkpoint == !!test_opt(sbi, DISABLE_CHECKPOINT)) {
+		if (test_opt(sbi, DISABLE_CHECKPOINT)) {
+			err = f2fs_disable_checkpoint(sbi);
+			if (err)
+				goto restore_discard;
+		} else {
+			f2fs_enable_checkpoint(sbi);
+		}
+	}
+
+skip:
+#ifdef CONFIG_QUOTA
+	/* Release old quota file names */
+	for (i = 0; i < MAXQUOTAS; i++)
+		kfree(org_mount_opt.s_qf_names[i]);
+#endif
+	/* Update the POSIXACL Flag */
+	sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
+		(test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
+
+	limit_reserve_root(sbi);
+	adjust_unusable_cap_perc(sbi);
+	*flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
+	return 0;
+restore_discard:
+	if (need_restart_discard) {
+		if (f2fs_start_discard_thread(sbi))
+			f2fs_warn(sbi, "discard has been stopped");
+	} else if (need_stop_discard) {
+		f2fs_stop_discard_thread(sbi);
+	}
+restore_flush:
+	if (need_restart_flush) {
+		if (f2fs_create_flush_cmd_control(sbi))
+			f2fs_warn(sbi, "background flush thread has stopped");
+	} else if (need_stop_flush) {
+		clear_opt(sbi, FLUSH_MERGE);
+		f2fs_destroy_flush_cmd_control(sbi, false);
+	}
+restore_ckpt:
+	if (need_restart_ckpt) {
+		if (f2fs_start_ckpt_thread(sbi))
+			f2fs_warn(sbi, "background ckpt thread has stopped");
+	} else if (need_stop_ckpt) {
+		f2fs_stop_ckpt_thread(sbi);
+	}
+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++) {
+		kfree(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;
+
+	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) {
+				memalloc_retry_wait(GFP_NOFS);
+				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;
+		}
+
+		memcpy_from_page(data, page, offset, tocopy);
+		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;
+	void *fsdata = NULL;
+	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,
+							&page, &fsdata);
+		if (unlikely(err)) {
+			if (err == -ENOMEM) {
+				f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
+				goto retry;
+			}
+			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
+			break;
+		}
+
+		memcpy_to_page(page, offset, data, tocopy);
+
+		a_ops->write_end(NULL, mapping, off, tocopy, tocopy,
+						page, fsdata);
+		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;
+}
+
+int f2fs_dquot_initialize(struct inode *inode)
+{
+	if (time_to_inject(F2FS_I_SB(inode), FAULT_DQUOT_INIT)) {
+		f2fs_show_injection_info(F2FS_I_SB(inode), FAULT_DQUOT_INIT);
+		return -ESRCH;
+	}
+
+	return dquot_initialize(inode);
+}
+
+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_load_quota_inode(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;
+}
+
+static int f2fs_quota_sync_file(struct f2fs_sb_info *sbi, int type)
+{
+	struct quota_info *dqopt = sb_dqopt(sbi->sb);
+	struct address_space *mapping = dqopt->files[type]->i_mapping;
+	int ret = 0;
+
+	ret = dquot_writeback_dquots(sbi->sb, type);
+	if (ret)
+		goto out;
+
+	ret = filemap_fdatawrite(mapping);
+	if (ret)
+		goto out;
+
+	/* if we are using journalled quota */
+	if (is_journalled_quota(sbi))
+		goto out;
+
+	ret = filemap_fdatawait(mapping);
+
+	truncate_inode_pages(&dqopt->files[type]->i_data, 0);
+out:
+	if (ret)
+		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+	return ret;
+}
+
+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 = 0;
+
+	/*
+	 * Now when everything is written we can discard the pagecache so
+	 * that userspace sees the changes.
+	 */
+	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+
+		if (type != -1 && cnt != type)
+			continue;
+
+		if (!sb_has_quota_active(sb, cnt))
+			continue;
+
+		if (!f2fs_sb_has_quota_ino(sbi))
+			inode_lock(dqopt->files[cnt]);
+
+		/*
+		 * do_quotactl
+		 *  f2fs_quota_sync
+		 *  f2fs_down_read(quota_sem)
+		 *  dquot_writeback_dquots()
+		 *  f2fs_dquot_commit
+		 *			      block_operation
+		 *			      f2fs_down_read(quota_sem)
+		 */
+		f2fs_lock_op(sbi);
+		f2fs_down_read(&sbi->quota_sem);
+
+		ret = f2fs_quota_sync_file(sbi, cnt);
+
+		f2fs_up_read(&sbi->quota_sem);
+		f2fs_unlock_op(sbi);
+
+		if (!f2fs_sb_has_quota_ino(sbi))
+			inode_unlock(dqopt->files[cnt]);
+
+		if (ret)
+			break;
+	}
+	return ret;
+}
+
+static int f2fs_quota_on(struct super_block *sb, int type, int format_id,
+							const struct path *path)
+{
+	struct inode *inode;
+	int err;
+
+	/* if quota sysfile exists, deny enabling quota with specific file */
+	if (f2fs_sb_has_quota_ino(F2FS_SB(sb))) {
+		f2fs_err(F2FS_SB(sb), "quota sysfile already exists");
+		return -EBUSY;
+	}
+
+	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;
+}
+
+static int f2fs_quota_off(struct super_block *sb, int type)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	int err;
+
+	err = __f2fs_quota_off(sb, type);
+
+	/*
+	 * quotactl can shutdown journalled quota, result in inconsistence
+	 * between quota record and fs data by following updates, tag the
+	 * flag to let fsck be aware of it.
+	 */
+	if (is_journalled_quota(sbi))
+		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+	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;
+
+	f2fs_down_read_nested(&sbi->quota_sem, SINGLE_DEPTH_NESTING);
+	ret = dquot_commit(dquot);
+	if (ret < 0)
+		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+	f2fs_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;
+
+	f2fs_down_read(&sbi->quota_sem);
+	ret = dquot_acquire(dquot);
+	if (ret < 0)
+		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+	f2fs_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 = dquot_release(dquot);
+
+	if (ret < 0)
+		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+	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 = dquot_mark_dquot_dirty(dquot);
+
+	/* if we are using journalled quota */
+	if (is_journalled_quota(sbi))
+		set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
+
+	return ret;
+}
+
+static int f2fs_dquot_commit_info(struct super_block *sb, int type)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	int ret = dquot_commit_info(sb, type);
+
+	if (ret < 0)
+		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+	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_dquot_initialize(struct inode *inode)
+{
+	return 0;
+}
+
+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,
+	.free_inode	= f2fs_free_inode,
+	.drop_inode	= f2fs_drop_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 const union fscrypt_policy *f2fs_get_dummy_policy(struct super_block *sb)
+{
+	return F2FS_OPTION(F2FS_SB(sb)).dummy_enc_policy.policy;
+}
+
+static bool f2fs_has_stable_inodes(struct super_block *sb)
+{
+	return true;
+}
+
+static void f2fs_get_ino_and_lblk_bits(struct super_block *sb,
+				       int *ino_bits_ret, int *lblk_bits_ret)
+{
+	*ino_bits_ret = 8 * sizeof(nid_t);
+	*lblk_bits_ret = 8 * sizeof(block_t);
+}
+
+static struct block_device **f2fs_get_devices(struct super_block *sb,
+					      unsigned int *num_devs)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct block_device **devs;
+	int i;
+
+	if (!f2fs_is_multi_device(sbi))
+		return NULL;
+
+	devs = kmalloc_array(sbi->s_ndevs, sizeof(*devs), GFP_KERNEL);
+	if (!devs)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < sbi->s_ndevs; i++)
+		devs[i] = FDEV(i).bdev;
+	*num_devs = sbi->s_ndevs;
+	return devs;
+}
+
+static const struct fscrypt_operations f2fs_cryptops = {
+	.key_prefix		= "f2fs:",
+	.get_context		= f2fs_get_context,
+	.set_context		= f2fs_set_context,
+	.get_dummy_policy	= f2fs_get_dummy_policy,
+	.empty_dir		= f2fs_empty_dir,
+	.has_stable_inodes	= f2fs_has_stable_inodes,
+	.get_ino_and_lblk_bits	= f2fs_get_ino_and_lblk_bits,
+	.get_devices		= f2fs_get_devices,
+};
+#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,
+};
+
+loff_t max_file_blocks(struct inode *inode)
+{
+	loff_t result = 0;
+	loff_t leaf_count;
+
+	/*
+	 * 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.
+	 */
+
+	if (inode && f2fs_compressed_file(inode))
+		leaf_count = ADDRS_PER_BLOCK(inode);
+	else
+		leaf_count = DEF_ADDRS_PER_BLOCK;
+
+	/* 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(%llu) block(%u)",
+			  main_blkaddr, seg_end_blkaddr,
+			  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(%llu) block(%u)",
+			  res, main_blkaddr, seg_end_blkaddr,
+			  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, segment_count_main;
+	block_t total_sections, blocks_per_seg;
+	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
+					(bh->b_data + F2FS_SUPER_OFFSET);
+	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 block size */
+	if (le32_to_cpu(raw_super->log_blocksize) != F2FS_BLKSIZE_BITS) {
+		f2fs_info(sbi, "Invalid log_blocksize (%u), supports only %u",
+			  le32_to_cpu(raw_super->log_blocksize),
+			  F2FS_BLKSIZE_BITS);
+		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);
+	segment_count_main = le32_to_cpu(raw_super->segment_count_main);
+	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 = BIT(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_main || total_sections < 1 ||
+			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_main != total_sections * segs_per_sec) {
+		f2fs_info(sbi, "Invalid segment/section count (%u != %u * %u)",
+			  segment_count_main, 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 (RDEV(0).path[0]) {
+		block_t dev_seg_count = le32_to_cpu(RDEV(0).total_segments);
+		int i = 1;
+
+		while (i < MAX_DEVICES && RDEV(i).path[0]) {
+			dev_seg_count += le32_to_cpu(RDEV(i).total_segments);
+			i++;
+		}
+		if (segment_count != dev_seg_count) {
+			f2fs_info(sbi, "Segment count (%u) mismatch with total segments from devices (%u)",
+					segment_count, dev_seg_count);
+			return -EFSCORRUPTED;
+		}
+	} else {
+		if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_BLKZONED) &&
+					!bdev_is_zoned(sbi->sb->s_bdev)) {
+			f2fs_info(sbi, "Zoned block device path is missing");
+			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 -
+				NR_CURSEG_PERSIST_TYPE)) {
+		f2fs_info(sbi, "Insane cp_payload (%u >= %u)",
+			  le32_to_cpu(raw_super->cp_payload),
+			  blocks_per_seg - F2FS_CP_PACKS -
+			  NR_CURSEG_PERSIST_TYPE);
+		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;
+	unsigned int nat_blocks, nat_bits_bytes, nat_bits_blocks;
+	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 (!f2fs_sb_has_readonly(sbi) &&
+			unlikely(fsmeta < F2FS_MIN_META_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) +
+			(f2fs_sb_has_readonly(sbi) ? 1 : 0);
+	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 - 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;
+
+		if (f2fs_sb_has_readonly(sbi))
+			goto check_data;
+
+		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;
+			}
+		}
+	}
+check_data:
+	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;
+
+		if (f2fs_sb_has_readonly(sbi))
+			goto skip_cross;
+
+		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, "Node segment (%u) and Data segment (%u) has the same segno: %u",
+					 i, j,
+					 le32_to_cpu(ckpt->cur_node_segno[i]));
+				return 1;
+			}
+		}
+	}
+skip_cross:
+	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_PERSIST_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;
+	}
+
+	nat_blocks = nat_segs << log_blocks_per_seg;
+	nat_bits_bytes = nat_blocks / BITS_PER_BYTE;
+	nat_bits_blocks = F2FS_BLK_ALIGN((nat_bits_bytes << 1) + 8);
+	if (__is_set_ckpt_flags(ckpt, CP_NAT_BITS_FLAG) &&
+		(cp_payload + F2FS_CP_PACKS +
+		NR_CURSEG_PERSIST_TYPE + nat_bits_blocks >= blocks_per_seg)) {
+		f2fs_warn(sbi, "Insane cp_payload: %u, nat_bits_blocks: %u)",
+			  cp_payload, nat_bits_blocks);
+		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 = BIT(sbi->log_blocksize);
+	sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
+	sbi->blocks_per_seg = BIT(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;
+	F2FS_ROOT_INO(sbi) = le32_to_cpu(raw_super->root_ino);
+	F2FS_NODE_INO(sbi) = le32_to_cpu(raw_super->node_ino);
+	F2FS_META_INO(sbi) = le32_to_cpu(raw_super->meta_ino);
+	sbi->cur_victim_sec = NULL_SECNO;
+	sbi->gc_mode = GC_NORMAL;
+	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->seq_file_ra_mul = MIN_RA_MUL;
+	sbi->max_fragment_chunk = DEF_FRAGMENT_SIZE;
+	sbi->max_fragment_hole = DEF_FRAGMENT_SIZE;
+	spin_lock_init(&sbi->gc_urgent_high_lock);
+	atomic64_set(&sbi->current_atomic_write, 0);
+
+	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_f2fs_rwsem(&sbi->io_order_lock);
+	spin_lock_init(&sbi->cp_lock);
+
+	sbi->dirty_device = 0;
+	spin_lock_init(&sbi->dev_lock);
+
+	init_f2fs_rwsem(&sbi->sb_lock);
+	init_f2fs_rwsem(&sbi->pin_sem);
+}
+
+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->rf_node_block_count, 0, GFP_KERNEL);
+	if (err)
+		goto err_valid_block;
+
+	err = percpu_counter_init(&sbi->total_valid_inode_count, 0,
+								GFP_KERNEL);
+	if (err)
+		goto err_node_block;
+	return 0;
+
+err_node_block:
+	percpu_counter_destroy(&sbi->rf_node_block_count);
+err_valid_block:
+	percpu_counter_destroy(&sbi->alloc_valid_block_count);
+	return err;
+}
+
+#ifdef CONFIG_BLK_DEV_ZONED
+
+struct f2fs_report_zones_args {
+	struct f2fs_sb_info *sbi;
+	struct f2fs_dev_info *dev;
+};
+
+static int f2fs_report_zone_cb(struct blk_zone *zone, unsigned int idx,
+			      void *data)
+{
+	struct f2fs_report_zones_args *rz_args = data;
+	block_t unusable_blocks = (zone->len - zone->capacity) >>
+					F2FS_LOG_SECTORS_PER_BLOCK;
+
+	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
+		return 0;
+
+	set_bit(idx, rz_args->dev->blkz_seq);
+	if (!rz_args->sbi->unusable_blocks_per_sec) {
+		rz_args->sbi->unusable_blocks_per_sec = unusable_blocks;
+		return 0;
+	}
+	if (rz_args->sbi->unusable_blocks_per_sec != unusable_blocks) {
+		f2fs_err(rz_args->sbi, "F2FS supports single zone capacity\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
+{
+	struct block_device *bdev = FDEV(devi).bdev;
+	sector_t nr_sectors = bdev_nr_sectors(bdev);
+	struct f2fs_report_zones_args rep_zone_arg;
+	u64 zone_sectors;
+	int ret;
+
+	if (!f2fs_sb_has_blkzoned(sbi))
+		return 0;
+
+	zone_sectors = bdev_zone_sectors(bdev);
+	if (!is_power_of_2(zone_sectors)) {
+		f2fs_err(sbi, "F2FS does not support non power of 2 zone sizes\n");
+		return -EINVAL;
+	}
+
+	if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
+				SECTOR_TO_BLOCK(zone_sectors))
+		return -EINVAL;
+	sbi->blocks_per_blkz = SECTOR_TO_BLOCK(zone_sectors);
+	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 & (zone_sectors - 1))
+		FDEV(devi).nr_blkz++;
+
+	FDEV(devi).blkz_seq = f2fs_kvzalloc(sbi,
+					BITS_TO_LONGS(FDEV(devi).nr_blkz)
+					* sizeof(unsigned long),
+					GFP_KERNEL);
+	if (!FDEV(devi).blkz_seq)
+		return -ENOMEM;
+
+	rep_zone_arg.sbi = sbi;
+	rep_zone_arg.dev = &FDEV(devi);
+
+	ret = blkdev_report_zones(bdev, 0, BLK_ALL_ZONES, f2fs_report_zone_cb,
+				  &rep_zone_arg);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+#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;
+			*recovery = 1;
+			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);
+			*recovery = 1;
+			continue;
+		}
+
+		if (!*raw_super) {
+			memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
+							sizeof(*super));
+			*valid_super_block = block;
+			*raw_super = super;
+		}
+		brelse(bh);
+	}
+
+	/* No valid superblock */
+	if (!*raw_super)
+		kfree(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;
+}
+
+void f2fs_handle_stop(struct f2fs_sb_info *sbi, unsigned char reason)
+{
+	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
+	int err;
+
+	f2fs_down_write(&sbi->sb_lock);
+
+	if (raw_super->s_stop_reason[reason] < GENMASK(BITS_PER_BYTE - 1, 0))
+		raw_super->s_stop_reason[reason]++;
+
+	err = f2fs_commit_super(sbi, false);
+	if (err)
+		f2fs_err(sbi, "f2fs_commit_super fails to record reason:%u err:%d",
+								reason, err);
+	f2fs_up_write(&sbi->sb_lock);
+}
+
+void f2fs_save_errors(struct f2fs_sb_info *sbi, unsigned char flag)
+{
+	spin_lock(&sbi->error_lock);
+	if (!test_bit(flag, (unsigned long *)sbi->errors)) {
+		set_bit(flag, (unsigned long *)sbi->errors);
+		sbi->error_dirty = true;
+	}
+	spin_unlock(&sbi->error_lock);
+}
+
+static bool f2fs_update_errors(struct f2fs_sb_info *sbi)
+{
+	bool need_update = false;
+
+	spin_lock(&sbi->error_lock);
+	if (sbi->error_dirty) {
+		memcpy(F2FS_RAW_SUPER(sbi)->s_errors, sbi->errors,
+							MAX_F2FS_ERRORS);
+		sbi->error_dirty = false;
+		need_update = true;
+	}
+	spin_unlock(&sbi->error_lock);
+
+	return need_update;
+}
+
+void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error)
+{
+	int err;
+
+	f2fs_save_errors(sbi, error);
+
+	f2fs_down_write(&sbi->sb_lock);
+
+	if (!f2fs_update_errors(sbi))
+		goto out_unlock;
+
+	err = f2fs_commit_super(sbi, false);
+	if (err)
+		f2fs_err(sbi, "f2fs_commit_super fails to record errors:%u, err:%d",
+								error, err);
+out_unlock:
+	f2fs_up_write(&sbi->sb_lock);
+}
+
+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;
+	unsigned int logical_blksize;
+	int i;
+
+	/* Initialize single device information */
+	if (!RDEV(0).path[0]) {
+		if (!bdev_is_zoned(sbi->sb->s_bdev))
+			return 0;
+		max_devices = 1;
+	}
+
+	/*
+	 * 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;
+
+	logical_blksize = bdev_logical_block_size(sbi->sb->s_bdev);
+	sbi->aligned_blksize = true;
+
+	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;
+
+		if (logical_blksize != bdev_logical_block_size(FDEV(i).bdev))
+			sbi->aligned_blksize = false;
+
+#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");
+			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: %8ld KB", F2FS_IO_SIZE_KB(sbi));
+	return 0;
+}
+
+static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
+{
+#if IS_ENABLED(CONFIG_UNICODE)
+	if (f2fs_sb_has_casefold(sbi) && !sbi->sb->s_encoding) {
+		const struct f2fs_sb_encodings *encoding_info;
+		struct unicode_map *encoding;
+		__u16 encoding_flags;
+
+		encoding_info = f2fs_sb_read_encoding(sbi->raw_super);
+		if (!encoding_info) {
+			f2fs_err(sbi,
+				 "Encoding requested by superblock is unknown");
+			return -EINVAL;
+		}
+
+		encoding_flags = le16_to_cpu(sbi->raw_super->s_encoding_flags);
+		encoding = utf8_load(encoding_info->version);
+		if (IS_ERR(encoding)) {
+			f2fs_err(sbi,
+				 "can't mount with superblock charset: %s-%u.%u.%u "
+				 "not supported by the kernel. flags: 0x%x.",
+				 encoding_info->name,
+				 unicode_major(encoding_info->version),
+				 unicode_minor(encoding_info->version),
+				 unicode_rev(encoding_info->version),
+				 encoding_flags);
+			return PTR_ERR(encoding);
+		}
+		f2fs_info(sbi, "Using encoding defined by superblock: "
+			 "%s-%u.%u.%u with flags 0x%hx", encoding_info->name,
+			 unicode_major(encoding_info->version),
+			 unicode_minor(encoding_info->version),
+			 unicode_rev(encoding_info->version),
+			 encoding_flags);
+
+		sbi->sb->s_encoding = encoding;
+		sbi->sb->s_encoding_flags = encoding_flags;
+	}
+#else
+	if (f2fs_sb_has_casefold(sbi)) {
+		f2fs_err(sbi, "Filesystem with casefold feature cannot be mounted without CONFIG_UNICODE");
+		return -EINVAL;
+	}
+#endif
+	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;
+		if (f2fs_block_unit_discard(sbi))
+			sm_i->dcc_info->discard_granularity = 1;
+		sm_i->ipu_policy = 1 << F2FS_IPU_FORCE |
+					1 << F2FS_IPU_HONOR_OPU_WRITE;
+	}
+
+	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;
+
+	/* initialize locks within allocated memory */
+	init_f2fs_rwsem(&sbi->gc_lock);
+	mutex_init(&sbi->writepages);
+	init_f2fs_rwsem(&sbi->cp_global_sem);
+	init_f2fs_rwsem(&sbi->node_write);
+	init_f2fs_rwsem(&sbi->node_change);
+	spin_lock_init(&sbi->stat_lock);
+	init_f2fs_rwsem(&sbi->cp_rwsem);
+	init_f2fs_rwsem(&sbi->quota_sem);
+	init_waitqueue_head(&sbi->cp_wait);
+	spin_lock_init(&sbi->error_lock);
+
+	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);
+
+	/* 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;
+
+	memcpy(sbi->errors, raw_super->s_errors, MAX_F2FS_ERRORS);
+
+	/* 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));
+
+	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, false);
+	if (err)
+		goto free_options;
+
+	sb->s_maxbytes = max_file_blocks(NULL) <<
+				le32_to_cpu(raw_super->log_blocksize);
+	sb->s_max_links = F2FS_LINK_MAX;
+
+	err = f2fs_setup_casefold(sbi);
+	if (err)
+		goto free_options;
+
+#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
+#ifdef CONFIG_FS_VERITY
+	sb->s_vop = &f2fs_verityops;
+#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 & ~SB_POSIXACL) |
+		(test_opt(sbi, POSIX_ACL) ? SB_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;
+
+	/* disallow all the data/node/meta page writes */
+	set_sbi_flag(sbi, SBI_POR_DOING);
+
+	err = f2fs_init_write_merge_io(sbi);
+	if (err)
+		goto free_bio_info;
+
+	init_sb_info(sbi);
+
+	err = f2fs_init_iostat(sbi);
+	if (err)
+		goto free_bio_info;
+
+	err = init_percpu_info(sbi);
+	if (err)
+		goto free_iostat;
+
+	if (F2FS_IO_ALIGNED(sbi)) {
+		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;
+		}
+	}
+
+	/* init per sbi slab cache */
+	err = f2fs_init_xattr_caches(sbi);
+	if (err)
+		goto free_io_dummy;
+	err = f2fs_init_page_array_cache(sbi);
+	if (err)
+		goto free_xattr_cache;
+
+	/* 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_page_array_cache;
+	}
+
+	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;
+	}
+
+	err = f2fs_init_post_read_wq(sbi);
+	if (err) {
+		f2fs_err(sbi, "Failed to initialize post read workqueue");
+		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);
+	adjust_unusable_cap_perc(sbi);
+
+	f2fs_init_extent_cache_info(sbi);
+
+	f2fs_init_ino_entry_info(sbi);
+
+	f2fs_init_fsync_node_info(sbi);
+
+	/* setup checkpoint request control and start checkpoint issue thread */
+	f2fs_init_ckpt_req_control(sbi);
+	if (!f2fs_readonly(sb) && !test_opt(sbi, DISABLE_CHECKPOINT) &&
+			test_opt(sbi, MERGE_CHECKPOINT)) {
+		err = f2fs_start_ckpt_thread(sbi);
+		if (err) {
+			f2fs_err(sbi,
+			    "Failed to start F2FS issue_checkpoint_thread (%d)",
+			    err);
+			goto stop_ckpt_thread;
+		}
+	}
+
+	/* 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;
+	}
+
+	err = adjust_reserved_segment(sbi);
+	if (err)
+		goto free_nm;
+
+	/* For write statistics */
+	sbi->sectors_written_start = f2fs_get_sectors_written(sbi);
+
+	/* 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_init_compress_inode(sbi);
+	if (err)
+		goto free_root_inode;
+
+	err = f2fs_register_sysfs(sbi);
+	if (err)
+		goto free_compress_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 any orphan inodes, 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) &&
+			!test_opt(sbi, NORECOVERY)) {
+		/*
+		 * 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 = f2fs_recover_fsync_data(sbi, true);
+				if (err > 0) {
+					err = -EROFS;
+					f2fs_err(sbi, "Need to recover fsync data, but "
+						"write access unavailable, please try "
+						"mount w/ disable_roll_forward or norecovery");
+				}
+				if (err < 0)
+					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;
+		}
+	}
+
+	/*
+	 * If the f2fs is not readonly and fsync data recovery succeeds,
+	 * check zoned block devices' write pointer consistency.
+	 */
+	if (!err && !f2fs_readonly(sb) && f2fs_sb_has_blkzoned(sbi)) {
+		err = f2fs_check_write_pointer(sbi);
+		if (err)
+			goto free_meta;
+	}
+
+reset_checkpoint:
+	f2fs_init_inmem_curseg(sbi);
+
+	/* 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 ((F2FS_OPTION(sbi).bggc_mode != BGGC_MODE_OFF ||
+		test_opt(sbi, GC_MERGE)) && !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_compress_inode:
+	f2fs_destroy_compress_inode(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:
+	/* stop discard thread before destroying node manager */
+	f2fs_stop_discard_thread(sbi);
+	f2fs_destroy_node_manager(sbi);
+free_sm:
+	f2fs_destroy_segment_manager(sbi);
+stop_ckpt_thread:
+	f2fs_stop_ckpt_thread(sbi);
+	f2fs_destroy_post_read_wq(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_page_array_cache:
+	f2fs_destroy_page_array_cache(sbi);
+free_xattr_cache:
+	f2fs_destroy_xattr_caches(sbi);
+free_io_dummy:
+	mempool_destroy(sbi->write_io_dummy);
+free_percpu:
+	destroy_percpu_info(sbi);
+free_iostat:
+	f2fs_destroy_iostat(sbi);
+free_bio_info:
+	for (i = 0; i < NR_PAGE_TYPE; i++)
+		kvfree(sbi->write_io[i]);
+
+#if IS_ENABLED(CONFIG_UNICODE)
+	utf8_unload(sb->s_encoding);
+	sb->s_encoding = NULL;
+#endif
+free_options:
+#ifdef CONFIG_QUOTA
+	for (i = 0; i < MAXQUOTAS; i++)
+		kfree(F2FS_OPTION(sbi).s_qf_names[i]);
+#endif
+	fscrypt_free_dummy_policy(&F2FS_OPTION(sbi).dummy_enc_policy);
+	kvfree(options);
+free_sb_buf:
+	kfree(raw_super);
+free_sbi:
+	if (sbi->s_chksum_driver)
+		crypto_free_shash(sbi->s_chksum_driver);
+	kfree(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);
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+		/*
+		 * latter evict_inode() can bypass checking and invalidating
+		 * compress inode cache.
+		 */
+		if (test_opt(sbi, COMPRESS_CACHE))
+			truncate_inode_pages_final(COMPRESS_MAPPING(sbi));
+#endif
+
+		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 &= ~SB_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 | FS_ALLOW_IDMAP,
+};
+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;
+	}
+
+	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_recovery_cache();
+	if (err)
+		goto free_checkpoint_caches;
+	err = f2fs_create_extent_cache();
+	if (err)
+		goto free_recovery_cache;
+	err = f2fs_create_garbage_collection_cache();
+	if (err)
+		goto free_extent_cache;
+	err = f2fs_init_sysfs();
+	if (err)
+		goto free_garbage_collection_cache;
+	err = register_shrinker(&f2fs_shrinker_info, "f2fs-shrinker");
+	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;
+	err = f2fs_init_iostat_processing();
+	if (err)
+		goto free_post_read;
+	err = f2fs_init_bio_entry_cache();
+	if (err)
+		goto free_iostat;
+	err = f2fs_init_bioset();
+	if (err)
+		goto free_bio_enrty_cache;
+	err = f2fs_init_compress_mempool();
+	if (err)
+		goto free_bioset;
+	err = f2fs_init_compress_cache();
+	if (err)
+		goto free_compress_mempool;
+	err = f2fs_create_casefold_cache();
+	if (err)
+		goto free_compress_cache;
+	return 0;
+free_compress_cache:
+	f2fs_destroy_compress_cache();
+free_compress_mempool:
+	f2fs_destroy_compress_mempool();
+free_bioset:
+	f2fs_destroy_bioset();
+free_bio_enrty_cache:
+	f2fs_destroy_bio_entry_cache();
+free_iostat:
+	f2fs_destroy_iostat_processing();
+free_post_read:
+	f2fs_destroy_post_read_processing();
+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_garbage_collection_cache:
+	f2fs_destroy_garbage_collection_cache();
+free_extent_cache:
+	f2fs_destroy_extent_cache();
+free_recovery_cache:
+	f2fs_destroy_recovery_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_casefold_cache();
+	f2fs_destroy_compress_cache();
+	f2fs_destroy_compress_mempool();
+	f2fs_destroy_bioset();
+	f2fs_destroy_bio_entry_cache();
+	f2fs_destroy_iostat_processing();
+	f2fs_destroy_post_read_processing();
+	f2fs_destroy_root_stats();
+	unregister_filesystem(&f2fs_fs_type);
+	unregister_shrinker(&f2fs_shrinker_info);
+	f2fs_exit_sysfs();
+	f2fs_destroy_garbage_collection_cache();
+	f2fs_destroy_extent_cache();
+	f2fs_destroy_recovery_cache();
+	f2fs_destroy_checkpoint_caches();
+	f2fs_destroy_segment_manager_caches();
+	f2fs_destroy_node_manager_caches();
+	destroy_inodecache();
+}
+
+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");
+MODULE_SOFTDEP("pre: crc32");
+