Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 2118 insertions, 0 deletions

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
new file mode 100644
index 000000000..811e350a1
--- /dev/null
+++ b/fs/f2fs/sysfs.c
@@ -0,0 +1,2118 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * f2fs sysfs interface
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *             http://www.samsung.com/
+ * Copyright (c) 2017 Chao Yu <chao@kernel.org>
+ */
+#include <linux/compiler.h>
+#include <linux/proc_fs.h>
+#include <linux/f2fs_fs.h>
+#include <linux/seq_file.h>
+#include <linux/unicode.h>
+#include <linux/ioprio.h>
+#include <linux/sysfs.h>
+
+#include "f2fs.h"
+#include "segment.h"
+#include "gc.h"
+#include "iostat.h"
+#include <trace/events/f2fs.h>
+
+static struct proc_dir_entry *f2fs_proc_root;
+
+/* Sysfs support for f2fs */
+enum {
+	GC_THREAD,	/* struct f2fs_gc_thread */
+	SM_INFO,	/* struct f2fs_sm_info */
+	DCC_INFO,	/* struct discard_cmd_control */
+	NM_INFO,	/* struct f2fs_nm_info */
+	F2FS_SBI,	/* struct f2fs_sb_info */
+#ifdef CONFIG_F2FS_STAT_FS
+	STAT_INFO,	/* struct f2fs_stat_info */
+#endif
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	FAULT_INFO_RATE,	/* struct f2fs_fault_info */
+	FAULT_INFO_TYPE,	/* struct f2fs_fault_info */
+	FAULT_INFO_TIMEOUT,	/* struct f2fs_fault_info */
+#endif
+	RESERVED_BLOCKS,	/* struct f2fs_sb_info */
+	CPRC_INFO,	/* struct ckpt_req_control */
+	ATGC_INFO,	/* struct atgc_management */
+};
+
+static const char *gc_mode_names[MAX_GC_MODE] = {
+	"GC_NORMAL",
+	"GC_IDLE_CB",
+	"GC_IDLE_GREEDY",
+	"GC_IDLE_AT",
+	"GC_URGENT_HIGH",
+	"GC_URGENT_LOW",
+	"GC_URGENT_MID"
+};
+
+struct f2fs_attr {
+	struct attribute attr;
+	ssize_t (*show)(struct f2fs_attr *a, struct f2fs_sb_info *sbi, char *buf);
+	ssize_t (*store)(struct f2fs_attr *a, struct f2fs_sb_info *sbi,
+			 const char *buf, size_t len);
+	int struct_type;
+	int offset;
+	int size;
+	int id;
+};
+
+struct f2fs_base_attr {
+	struct attribute attr;
+	ssize_t (*show)(struct f2fs_base_attr *a, char *buf);
+	ssize_t (*store)(struct f2fs_base_attr *a, const char *buf, size_t len);
+};
+
+static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
+			     struct f2fs_sb_info *sbi, char *buf);
+
+static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
+{
+	if (struct_type == GC_THREAD)
+		return (unsigned char *)&sbi->gc_thread;
+	else if (struct_type == SM_INFO)
+		return (unsigned char *)SM_I(sbi);
+	else if (struct_type == DCC_INFO)
+		return (unsigned char *)SM_I(sbi)->dcc_info;
+	else if (struct_type == NM_INFO)
+		return (unsigned char *)NM_I(sbi);
+	else if (struct_type == F2FS_SBI || struct_type == RESERVED_BLOCKS)
+		return (unsigned char *)sbi;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	else if (struct_type == FAULT_INFO_RATE ||
+		struct_type == FAULT_INFO_TYPE ||
+		struct_type == FAULT_INFO_TIMEOUT)
+		return (unsigned char *)&F2FS_OPTION(sbi).fault_info;
+#endif
+#ifdef CONFIG_F2FS_STAT_FS
+	else if (struct_type == STAT_INFO)
+		return (unsigned char *)F2FS_STAT(sbi);
+#endif
+	else if (struct_type == CPRC_INFO)
+		return (unsigned char *)&sbi->cprc_info;
+	else if (struct_type == ATGC_INFO)
+		return (unsigned char *)&sbi->am;
+	return NULL;
+}
+
+static ssize_t dirty_segments_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%llu\n",
+			(unsigned long long)(dirty_segments(sbi)));
+}
+
+static ssize_t free_segments_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%llu\n",
+			(unsigned long long)(free_segments(sbi)));
+}
+
+static ssize_t ovp_segments_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%llu\n",
+			(unsigned long long)(overprovision_segments(sbi)));
+}
+
+static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%llu\n",
+			(unsigned long long)(sbi->kbytes_written +
+			((f2fs_get_sectors_written(sbi) -
+				sbi->sectors_written_start) >> 1)));
+}
+
+static ssize_t sb_status_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%lx\n", sbi->s_flag);
+}
+
+static ssize_t cp_status_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%x\n", le32_to_cpu(F2FS_CKPT(sbi)->ckpt_flags));
+}
+
+static ssize_t pending_discard_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	if (!SM_I(sbi)->dcc_info)
+		return -EINVAL;
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)atomic_read(
+				&SM_I(sbi)->dcc_info->discard_cmd_cnt));
+}
+
+static ssize_t issued_discard_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	if (!SM_I(sbi)->dcc_info)
+		return -EINVAL;
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)atomic_read(
+				&SM_I(sbi)->dcc_info->issued_discard));
+}
+
+static ssize_t queued_discard_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	if (!SM_I(sbi)->dcc_info)
+		return -EINVAL;
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)atomic_read(
+				&SM_I(sbi)->dcc_info->queued_discard));
+}
+
+static ssize_t undiscard_blks_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	if (!SM_I(sbi)->dcc_info)
+		return -EINVAL;
+	return sysfs_emit(buf, "%u\n",
+				SM_I(sbi)->dcc_info->undiscard_blks);
+}
+
+static ssize_t atgc_enabled_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%d\n", sbi->am.atgc_enabled ? 1 : 0);
+}
+
+static ssize_t gc_mode_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%s\n", gc_mode_names[sbi->gc_mode]);
+}
+
+static ssize_t features_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	int len = 0;
+
+	if (f2fs_sb_has_encrypt(sbi))
+		len += sysfs_emit_at(buf, len, "%s",
+						"encryption");
+	if (f2fs_sb_has_blkzoned(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "blkzoned");
+	if (f2fs_sb_has_extra_attr(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "extra_attr");
+	if (f2fs_sb_has_project_quota(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "projquota");
+	if (f2fs_sb_has_inode_chksum(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "inode_checksum");
+	if (f2fs_sb_has_flexible_inline_xattr(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "flexible_inline_xattr");
+	if (f2fs_sb_has_quota_ino(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "quota_ino");
+	if (f2fs_sb_has_inode_crtime(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "inode_crtime");
+	if (f2fs_sb_has_lost_found(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "lost_found");
+	if (f2fs_sb_has_verity(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "verity");
+	if (f2fs_sb_has_sb_chksum(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "sb_checksum");
+	if (f2fs_sb_has_casefold(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "casefold");
+	if (f2fs_sb_has_readonly(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "readonly");
+	if (f2fs_sb_has_compression(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "compression");
+	if (f2fs_sb_has_packed_ssa(sbi))
+		len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "packed_ssa");
+	len += sysfs_emit_at(buf, len, "%s%s",
+				len ? ", " : "", "pin_file");
+	len += sysfs_emit_at(buf, len, "\n");
+	return len;
+}
+
+static ssize_t current_reserved_blocks_show(struct f2fs_attr *a,
+					struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", sbi->current_reserved_blocks);
+}
+
+static ssize_t unusable_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	block_t unusable;
+
+	if (test_opt(sbi, DISABLE_CHECKPOINT))
+		unusable = sbi->unusable_block_count;
+	else
+		unusable = f2fs_get_unusable_blocks(sbi);
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)unusable);
+}
+
+static ssize_t encoding_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+#if IS_ENABLED(CONFIG_UNICODE)
+	struct super_block *sb = sbi->sb;
+
+	if (f2fs_sb_has_casefold(sbi))
+		return sysfs_emit(buf, "UTF-8 (%d.%d.%d)\n",
+			(sb->s_encoding->version >> 16) & 0xff,
+			(sb->s_encoding->version >> 8) & 0xff,
+			sb->s_encoding->version & 0xff);
+#endif
+	return sysfs_emit(buf, "(none)\n");
+}
+
+static ssize_t encoding_flags_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%x\n",
+		le16_to_cpu(F2FS_RAW_SUPER(sbi)->s_encoding_flags));
+}
+
+static ssize_t effective_lookup_mode_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	switch (F2FS_OPTION(sbi).lookup_mode) {
+	case LOOKUP_PERF:
+		return sysfs_emit(buf, "perf\n");
+	case LOOKUP_COMPAT:
+		return sysfs_emit(buf, "compat\n");
+	case LOOKUP_AUTO:
+		if (sb_no_casefold_compat_fallback(sbi->sb))
+			return sysfs_emit(buf, "auto:perf\n");
+		return sysfs_emit(buf, "auto:compat\n");
+	}
+	return 0;
+}
+
+static ssize_t mounted_time_sec_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%llu\n", SIT_I(sbi)->mounted_time);
+}
+
+#ifdef CONFIG_F2FS_STAT_FS
+static ssize_t moved_blocks_foreground_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct f2fs_stat_info *si = F2FS_STAT(sbi);
+
+	return sysfs_emit(buf, "%llu\n",
+		(unsigned long long)(si->tot_blks -
+			(si->bg_data_blks + si->bg_node_blks)));
+}
+
+static ssize_t moved_blocks_background_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct f2fs_stat_info *si = F2FS_STAT(sbi);
+
+	return sysfs_emit(buf, "%llu\n",
+		(unsigned long long)(si->bg_data_blks + si->bg_node_blks));
+}
+
+static ssize_t avg_vblocks_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	struct f2fs_stat_info *si = F2FS_STAT(sbi);
+
+	si->dirty_count = dirty_segments(sbi);
+	f2fs_update_sit_info(sbi);
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)(si->avg_vblocks));
+}
+
+static ssize_t defrag_blocks_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct f2fs_stat_info *si = F2FS_STAT(sbi);
+
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)(si->defrag_blks));
+}
+#endif
+
+static ssize_t main_blkaddr_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%llu\n",
+			(unsigned long long)MAIN_BLKADDR(sbi));
+}
+
+static ssize_t __sbi_show_value(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf,
+		unsigned char *value)
+{
+	switch (a->size) {
+	case 1:
+		return sysfs_emit(buf, "%u\n", *(u8 *)value);
+	case 2:
+		return sysfs_emit(buf, "%u\n", *(u16 *)value);
+	case 4:
+		return sysfs_emit(buf, "%u\n", *(u32 *)value);
+	case 8:
+		return sysfs_emit(buf, "%llu\n", *(u64 *)value);
+	default:
+		f2fs_bug_on(sbi, 1);
+		return sysfs_emit(buf,
+				"show sysfs node value with wrong type\n");
+	}
+}
+
+static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
+			struct f2fs_sb_info *sbi, char *buf)
+{
+	unsigned char *ptr = NULL;
+
+	ptr = __struct_ptr(sbi, a->struct_type);
+	if (!ptr)
+		return -EINVAL;
+
+	if (!strcmp(a->attr.name, "extension_list")) {
+		__u8 (*extlist)[F2FS_EXTENSION_LEN] =
+					sbi->raw_super->extension_list;
+		int cold_count, hot_count;
+		int len = 0, i;
+
+		f2fs_down_read(&sbi->sb_lock);
+		cold_count = le32_to_cpu(sbi->raw_super->extension_count);
+		hot_count = sbi->raw_super->hot_ext_count;
+		len += sysfs_emit_at(buf, len, "cold file extension:\n");
+		for (i = 0; i < cold_count; i++)
+			len += sysfs_emit_at(buf, len, "%s\n", extlist[i]);
+
+		len += sysfs_emit_at(buf, len, "hot file extension:\n");
+		for (i = cold_count; i < cold_count + hot_count; i++)
+			len += sysfs_emit_at(buf, len, "%s\n", extlist[i]);
+		f2fs_up_read(&sbi->sb_lock);
+
+		return len;
+	}
+
+	if (!strcmp(a->attr.name, "ckpt_thread_ioprio")) {
+		struct ckpt_req_control *cprc = &sbi->cprc_info;
+		int class = IOPRIO_PRIO_CLASS(cprc->ckpt_thread_ioprio);
+		int level = IOPRIO_PRIO_LEVEL(cprc->ckpt_thread_ioprio);
+
+		if (class != IOPRIO_CLASS_RT && class != IOPRIO_CLASS_BE)
+			return -EINVAL;
+
+		return sysfs_emit(buf, "%s,%d\n",
+			class == IOPRIO_CLASS_RT ? "rt" : "be", level);
+	}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (!strcmp(a->attr.name, "compr_written_block"))
+		return sysfs_emit(buf, "%llu\n", sbi->compr_written_block);
+
+	if (!strcmp(a->attr.name, "compr_saved_block"))
+		return sysfs_emit(buf, "%llu\n", sbi->compr_saved_block);
+
+	if (!strcmp(a->attr.name, "compr_new_inode"))
+		return sysfs_emit(buf, "%u\n", sbi->compr_new_inode);
+#endif
+
+	if (!strcmp(a->attr.name, "gc_segment_mode"))
+		return sysfs_emit(buf, "%u\n", sbi->gc_segment_mode);
+
+	if (!strcmp(a->attr.name, "gc_reclaimed_segments")) {
+		return sysfs_emit(buf, "%u\n",
+			sbi->gc_reclaimed_segs[sbi->gc_segment_mode]);
+	}
+
+	if (!strcmp(a->attr.name, "current_atomic_write")) {
+		s64 current_write = atomic64_read(&sbi->current_atomic_write);
+
+		return sysfs_emit(buf, "%lld\n", current_write);
+	}
+
+	if (!strcmp(a->attr.name, "peak_atomic_write"))
+		return sysfs_emit(buf, "%lld\n", sbi->peak_atomic_write);
+
+	if (!strcmp(a->attr.name, "committed_atomic_block"))
+		return sysfs_emit(buf, "%llu\n", sbi->committed_atomic_block);
+
+	if (!strcmp(a->attr.name, "revoked_atomic_block"))
+		return sysfs_emit(buf, "%llu\n", sbi->revoked_atomic_block);
+
+#ifdef CONFIG_F2FS_STAT_FS
+	if (!strcmp(a->attr.name, "cp_foreground_calls"))
+		return sysfs_emit(buf, "%d\n",
+				atomic_read(&sbi->cp_call_count[TOTAL_CALL]) -
+				atomic_read(&sbi->cp_call_count[BACKGROUND]));
+	if (!strcmp(a->attr.name, "cp_background_calls"))
+		return sysfs_emit(buf, "%d\n",
+				atomic_read(&sbi->cp_call_count[BACKGROUND]));
+#endif
+
+	return __sbi_show_value(a, sbi, buf, ptr + a->offset);
+}
+
+static void __sbi_store_value(struct f2fs_attr *a,
+			struct f2fs_sb_info *sbi,
+			unsigned char *ui, unsigned long value)
+{
+	switch (a->size) {
+	case 1:
+		*(u8 *)ui = value;
+		break;
+	case 2:
+		*(u16 *)ui = value;
+		break;
+	case 4:
+		*(u32 *)ui = value;
+		break;
+	case 8:
+		*(u64 *)ui = value;
+		break;
+	default:
+		f2fs_bug_on(sbi, 1);
+		f2fs_err(sbi, "store sysfs node value with wrong type");
+	}
+}
+
+static ssize_t __sbi_store(struct f2fs_attr *a,
+			struct f2fs_sb_info *sbi,
+			const char *buf, size_t count)
+{
+	unsigned char *ptr;
+	unsigned long t;
+	unsigned int *ui;
+	ssize_t ret;
+
+	ptr = __struct_ptr(sbi, a->struct_type);
+	if (!ptr)
+		return -EINVAL;
+
+	if (!strcmp(a->attr.name, "extension_list")) {
+		const char *name = strim((char *)buf);
+		bool set = true, hot;
+
+		if (!strncmp(name, "[h]", 3))
+			hot = true;
+		else if (!strncmp(name, "[c]", 3))
+			hot = false;
+		else
+			return -EINVAL;
+
+		name += 3;
+
+		if (*name == '!') {
+			name++;
+			set = false;
+		}
+
+		if (!strlen(name) || strlen(name) >= F2FS_EXTENSION_LEN)
+			return -EINVAL;
+
+		f2fs_down_write(&sbi->sb_lock);
+
+		ret = f2fs_update_extension_list(sbi, name, hot, set);
+		if (ret)
+			goto out;
+
+		ret = f2fs_commit_super(sbi, false);
+		if (ret)
+			f2fs_update_extension_list(sbi, name, hot, !set);
+out:
+		f2fs_up_write(&sbi->sb_lock);
+		return ret ? ret : count;
+	}
+
+	if (!strcmp(a->attr.name, "ckpt_thread_ioprio")) {
+		const char *name = strim((char *)buf);
+		struct ckpt_req_control *cprc = &sbi->cprc_info;
+		int class;
+		long level;
+		int ret;
+
+		if (!strncmp(name, "rt,", 3))
+			class = IOPRIO_CLASS_RT;
+		else if (!strncmp(name, "be,", 3))
+			class = IOPRIO_CLASS_BE;
+		else
+			return -EINVAL;
+
+		name += 3;
+		ret = kstrtol(name, 10, &level);
+		if (ret)
+			return ret;
+		if (level >= IOPRIO_NR_LEVELS || level < 0)
+			return -EINVAL;
+
+		cprc->ckpt_thread_ioprio = IOPRIO_PRIO_VALUE(class, level);
+		if (cprc->f2fs_issue_ckpt) {
+			ret = set_task_ioprio(cprc->f2fs_issue_ckpt,
+					cprc->ckpt_thread_ioprio);
+			if (ret)
+				return ret;
+		}
+
+		return count;
+	}
+
+	ui = (unsigned int *)(ptr + a->offset);
+
+	ret = kstrtoul(skip_spaces(buf), 0, &t);
+	if (ret < 0)
+		return ret;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	if (a->struct_type == FAULT_INFO_TYPE) {
+		if (f2fs_build_fault_attr(sbi, 0, t, FAULT_TYPE))
+			return -EINVAL;
+		return count;
+	}
+	if (a->struct_type == FAULT_INFO_RATE) {
+		if (f2fs_build_fault_attr(sbi, t, 0, FAULT_RATE))
+			return -EINVAL;
+		return count;
+	}
+	if (a->struct_type == FAULT_INFO_TIMEOUT) {
+		if (f2fs_build_fault_attr(sbi, 0, t, FAULT_TIMEOUT))
+			return -EINVAL;
+		f2fs_simulate_lock_timeout(sbi);
+		return count;
+	}
+#endif
+	if (a->struct_type == RESERVED_BLOCKS) {
+		spin_lock(&sbi->stat_lock);
+		if (t > (unsigned long)(sbi->user_block_count -
+				F2FS_OPTION(sbi).root_reserved_blocks)) {
+			spin_unlock(&sbi->stat_lock);
+			return -EINVAL;
+		}
+		*ui = t;
+		sbi->current_reserved_blocks = min(sbi->reserved_blocks,
+				sbi->user_block_count - valid_user_blocks(sbi));
+		spin_unlock(&sbi->stat_lock);
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "discard_io_aware_gran")) {
+		if (t > MAX_PLIST_NUM)
+			return -EINVAL;
+		if (!f2fs_block_unit_discard(sbi))
+			return -EINVAL;
+		if (t == *ui)
+			return count;
+		*ui = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "discard_granularity")) {
+		if (t == 0 || t > MAX_PLIST_NUM)
+			return -EINVAL;
+		if (!f2fs_block_unit_discard(sbi))
+			return -EINVAL;
+		if (t == *ui)
+			return count;
+		*ui = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "max_ordered_discard")) {
+		if (t == 0 || t > MAX_PLIST_NUM)
+			return -EINVAL;
+		if (!f2fs_block_unit_discard(sbi))
+			return -EINVAL;
+		*ui = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "discard_urgent_util")) {
+		if (t > 100)
+			return -EINVAL;
+		*ui = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "discard_io_aware")) {
+		if (t >= DPOLICY_IO_AWARE_MAX)
+			return -EINVAL;
+		*ui = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "migration_granularity")) {
+		if (t == 0 || t > SEGS_PER_SEC(sbi))
+			return -EINVAL;
+	}
+
+	if (!strcmp(a->attr.name, "migration_window_granularity")) {
+		if (t == 0 || t > SEGS_PER_SEC(sbi))
+			return -EINVAL;
+	}
+
+	if (!strcmp(a->attr.name, "gc_urgent")) {
+		if (t == 0) {
+			sbi->gc_mode = GC_NORMAL;
+		} else if (t == 1) {
+			sbi->gc_mode = GC_URGENT_HIGH;
+			if (sbi->gc_thread.f2fs_gc_task) {
+				sbi->gc_thread.gc_wake = true;
+				wake_up_interruptible_all(
+					&sbi->gc_thread.gc_wait_queue_head);
+				wake_up_discard_thread(sbi, true);
+			}
+		} else if (t == 2) {
+			sbi->gc_mode = GC_URGENT_LOW;
+		} else if (t == 3) {
+			sbi->gc_mode = GC_URGENT_MID;
+			if (sbi->gc_thread.f2fs_gc_task) {
+				sbi->gc_thread.gc_wake = true;
+				wake_up_interruptible_all(
+					&sbi->gc_thread.gc_wait_queue_head);
+			}
+		} else {
+			return -EINVAL;
+		}
+		return count;
+	}
+	if (!strcmp(a->attr.name, "gc_idle")) {
+		if (t == GC_IDLE_CB) {
+			sbi->gc_mode = GC_IDLE_CB;
+		} else if (t == GC_IDLE_GREEDY) {
+			sbi->gc_mode = GC_IDLE_GREEDY;
+		} else if (t == GC_IDLE_AT) {
+			if (!sbi->am.atgc_enabled)
+				return -EINVAL;
+			sbi->gc_mode = GC_IDLE_AT;
+		} else {
+			sbi->gc_mode = GC_NORMAL;
+		}
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_remaining_trials")) {
+		spin_lock(&sbi->gc_remaining_trials_lock);
+		sbi->gc_remaining_trials = t;
+		spin_unlock(&sbi->gc_remaining_trials_lock);
+
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_no_zoned_gc_percent")) {
+		if (t > 100)
+			return -EINVAL;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_boost_zoned_gc_percent")) {
+		if (t > 100)
+			return -EINVAL;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_valid_thresh_ratio")) {
+		if (t > 100)
+			return -EINVAL;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+#ifdef CONFIG_F2FS_IOSTAT
+	if (!strcmp(a->attr.name, "iostat_enable")) {
+		sbi->iostat_enable = !!t;
+		if (!sbi->iostat_enable)
+			f2fs_reset_iostat(sbi);
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "iostat_period_ms")) {
+		if (t < MIN_IOSTAT_PERIOD_MS || t > MAX_IOSTAT_PERIOD_MS)
+			return -EINVAL;
+		spin_lock_irq(&sbi->iostat_lock);
+		sbi->iostat_period_ms = (unsigned int)t;
+		spin_unlock_irq(&sbi->iostat_lock);
+		return count;
+	}
+#endif
+
+#ifdef CONFIG_BLK_DEV_ZONED
+	if (!strcmp(a->attr.name, "blkzone_alloc_policy")) {
+		if (t < BLKZONE_ALLOC_PRIOR_SEQ || t > BLKZONE_ALLOC_PRIOR_CONV)
+			return -EINVAL;
+		sbi->blkzone_alloc_policy = t;
+		return count;
+	}
+#endif
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (!strcmp(a->attr.name, "compr_written_block") ||
+		!strcmp(a->attr.name, "compr_saved_block")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->compr_written_block = 0;
+		sbi->compr_saved_block = 0;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "compr_new_inode")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->compr_new_inode = 0;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "compress_percent")) {
+		if (t == 0 || t > 100)
+			return -EINVAL;
+		*ui = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "compress_watermark")) {
+		if (t == 0 || t > 100)
+			return -EINVAL;
+		*ui = t;
+		return count;
+	}
+#endif
+
+	if (!strcmp(a->attr.name, "atgc_candidate_ratio")) {
+		if (t > 100)
+			return -EINVAL;
+		sbi->am.candidate_ratio = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "atgc_age_weight")) {
+		if (t > 100)
+			return -EINVAL;
+		sbi->am.age_weight = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_segment_mode")) {
+		if (t < MAX_GC_MODE)
+			sbi->gc_segment_mode = t;
+		else
+			return -EINVAL;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_pin_file_thresh")) {
+		if (t > MAX_GC_FAILED_PINNED_FILES)
+			return -EINVAL;
+		sbi->gc_pin_file_threshold = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_reclaimed_segments")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->gc_reclaimed_segs[sbi->gc_segment_mode] = 0;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "seq_file_ra_mul")) {
+		if (t >= MIN_RA_MUL && t <= MAX_RA_MUL)
+			sbi->seq_file_ra_mul = t;
+		else
+			return -EINVAL;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "max_fragment_chunk")) {
+		if (t >= MIN_FRAGMENT_SIZE && t <= MAX_FRAGMENT_SIZE)
+			sbi->max_fragment_chunk = t;
+		else
+			return -EINVAL;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "max_fragment_hole")) {
+		if (t >= MIN_FRAGMENT_SIZE && t <= MAX_FRAGMENT_SIZE)
+			sbi->max_fragment_hole = t;
+		else
+			return -EINVAL;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "peak_atomic_write")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->peak_atomic_write = 0;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "committed_atomic_block")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->committed_atomic_block = 0;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "revoked_atomic_block")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->revoked_atomic_block = 0;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "readdir_ra")) {
+		sbi->readdir_ra = !!t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "hot_data_age_threshold")) {
+		if (t == 0 || t >= sbi->warm_data_age_threshold)
+			return -EINVAL;
+		if (t == *ui)
+			return count;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "warm_data_age_threshold")) {
+		if (t <= sbi->hot_data_age_threshold)
+			return -EINVAL;
+		if (t == *ui)
+			return count;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "last_age_weight")) {
+		if (t > 100)
+			return -EINVAL;
+		if (t == *ui)
+			return count;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "max_read_extent_count")) {
+		if (t > UINT_MAX)
+			return -EINVAL;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "ipu_policy")) {
+		if (t >= BIT(F2FS_IPU_MAX))
+			return -EINVAL;
+		/* allow F2FS_IPU_NOCACHE only for IPU in the pinned file */
+		if (f2fs_lfs_mode(sbi) && (t & ~BIT(F2FS_IPU_NOCACHE)))
+			return -EINVAL;
+		SM_I(sbi)->ipu_policy = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "dir_level")) {
+		if (t > MAX_DIR_HASH_DEPTH)
+			return -EINVAL;
+		sbi->dir_level = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "reserved_pin_section")) {
+		if (t > GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))
+			return -EINVAL;
+		*ui = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_boost_gc_multiple")) {
+		if (t < 1 || t > SEGS_PER_SEC(sbi))
+			return -EINVAL;
+		sbi->gc_thread.boost_gc_multiple = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "gc_boost_gc_greedy")) {
+		if (t > GC_GREEDY)
+			return -EINVAL;
+		sbi->gc_thread.boost_gc_greedy = (unsigned int)t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "bggc_io_aware")) {
+		if (t < AWARE_ALL_IO || t > AWARE_NONE)
+			return -EINVAL;
+		sbi->bggc_io_aware = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "allocate_section_hint")) {
+		if (t < 0 || t > MAIN_SECS(sbi))
+			return -EINVAL;
+		sbi->allocate_section_hint = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "allocate_section_policy")) {
+		if (t < ALLOCATE_FORWARD_NOHINT || t > ALLOCATE_FORWARD_FROM_HINT)
+			return -EINVAL;
+		sbi->allocate_section_policy = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "adjust_lock_priority")) {
+		if (t >= BIT(LOCK_NAME_MAX - 1))
+			return -EINVAL;
+		sbi->adjust_lock_priority = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "lock_duration_priority")) {
+		if (t < NICE_TO_PRIO(MIN_NICE) || t > NICE_TO_PRIO(MAX_NICE))
+			return -EINVAL;
+		sbi->lock_duration_priority = t;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "critical_task_priority")) {
+		if (t < NICE_TO_PRIO(MIN_NICE) || t > NICE_TO_PRIO(MAX_NICE))
+			return -EINVAL;
+		if (!capable(CAP_SYS_NICE))
+			return -EPERM;
+		sbi->critical_task_priority = t;
+		if (sbi->cprc_info.f2fs_issue_ckpt)
+			set_user_nice(sbi->cprc_info.f2fs_issue_ckpt,
+					PRIO_TO_NICE(sbi->critical_task_priority));
+		if (sbi->gc_thread.f2fs_gc_task)
+			set_user_nice(sbi->gc_thread.f2fs_gc_task,
+					PRIO_TO_NICE(sbi->critical_task_priority));
+		return count;
+	}
+
+	__sbi_store_value(a, sbi, ptr + a->offset, t);
+
+	return count;
+}
+
+static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
+			struct f2fs_sb_info *sbi,
+			const char *buf, size_t count)
+{
+	ssize_t ret;
+	bool gc_entry = (!strcmp(a->attr.name, "gc_urgent") ||
+					a->struct_type == GC_THREAD);
+	bool thread_entry = !strcmp(a->attr.name, "ckpt_thread_ioprio") ||
+			!strcmp(a->attr.name, "critical_task_priority");
+
+	if (gc_entry || thread_entry) {
+		if (!down_read_trylock(&sbi->sb->s_umount))
+			return -EAGAIN;
+	}
+	ret = __sbi_store(a, sbi, buf, count);
+	if (gc_entry || thread_entry)
+		up_read(&sbi->sb->s_umount);
+
+	return ret;
+}
+
+static ssize_t f2fs_attr_show(struct kobject *kobj,
+				struct attribute *attr, char *buf)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+								s_kobj);
+	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+	return a->show ? a->show(a, sbi, buf) : 0;
+}
+
+static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
+						const char *buf, size_t len)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+									s_kobj);
+	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+	return a->store ? a->store(a, sbi, buf, len) : 0;
+}
+
+static void f2fs_sb_release(struct kobject *kobj)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+								s_kobj);
+	complete(&sbi->s_kobj_unregister);
+}
+
+static ssize_t f2fs_base_attr_show(struct kobject *kobj,
+				struct attribute *attr, char *buf)
+{
+	struct f2fs_base_attr *a = container_of(attr,
+				struct f2fs_base_attr, attr);
+
+	return a->show ? a->show(a, buf) : 0;
+}
+
+static ssize_t f2fs_base_attr_store(struct kobject *kobj,
+				struct attribute *attr,
+				const char *buf, size_t len)
+{
+	struct f2fs_base_attr *a = container_of(attr,
+				struct f2fs_base_attr, attr);
+
+	return a->store ? a->store(a, buf, len) : 0;
+}
+
+/*
+ * Note that there are three feature list entries:
+ * 1) /sys/fs/f2fs/features
+ *   : shows runtime features supported by in-kernel f2fs along with Kconfig.
+ *     - ref. F2FS_FEATURE_RO_ATTR()
+ *
+ * 2) /sys/fs/f2fs/$s_id/features <deprecated>
+ *   : shows on-disk features enabled by mkfs.f2fs, used for old kernels. This
+ *     won't add new feature anymore, and thus, users should check entries in 3)
+ *     instead of this 2).
+ *
+ * 3) /sys/fs/f2fs/$s_id/feature_list
+ *   : shows on-disk features enabled by mkfs.f2fs per instance, which follows
+ *     sysfs entry rule where each entry should expose single value.
+ *     This list covers old feature list provided by 2) and beyond. Therefore,
+ *     please add new on-disk feature in this list only.
+ *     - ref. F2FS_SB_FEATURE_RO_ATTR()
+ */
+static ssize_t f2fs_feature_show(struct f2fs_base_attr *a, char *buf)
+{
+	return sysfs_emit(buf, "supported\n");
+}
+
+#define F2FS_FEATURE_RO_ATTR(_name)				\
+static struct f2fs_base_attr f2fs_base_attr_##_name = {		\
+	.attr = {.name = __stringify(_name), .mode = 0444 },	\
+	.show	= f2fs_feature_show,				\
+}
+
+static ssize_t f2fs_tune_show(struct f2fs_base_attr *a, char *buf)
+{
+	unsigned int res = 0;
+
+	if (!strcmp(a->attr.name, "reclaim_caches_kb"))
+		res = f2fs_donate_files();
+
+	return sysfs_emit(buf, "%u\n", res);
+}
+
+static ssize_t f2fs_tune_store(struct f2fs_base_attr *a,
+			const char *buf, size_t count)
+{
+	unsigned long t;
+	int ret;
+
+	ret = kstrtoul(skip_spaces(buf), 0, &t);
+	if (ret)
+		return ret;
+
+	if (!strcmp(a->attr.name, "reclaim_caches_kb"))
+		f2fs_reclaim_caches(t);
+
+	return count;
+}
+
+#define F2FS_TUNE_RW_ATTR(_name)				\
+static struct f2fs_base_attr f2fs_base_attr_##_name = {		\
+	.attr = {.name = __stringify(_name), .mode = 0644 },	\
+	.show	= f2fs_tune_show,				\
+	.store	= f2fs_tune_store,				\
+}
+
+static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	if (F2FS_HAS_FEATURE(sbi, a->id))
+		return sysfs_emit(buf, "supported\n");
+	return sysfs_emit(buf, "unsupported\n");
+}
+
+#define F2FS_SB_FEATURE_RO_ATTR(_name, _feat)			\
+static struct f2fs_attr f2fs_attr_sb_##_name = {		\
+	.attr = {.name = __stringify(_name), .mode = 0444 },	\
+	.show	= f2fs_sb_feature_show,				\
+	.id	= F2FS_FEATURE_##_feat,				\
+}
+
+#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset, _size) \
+static struct f2fs_attr f2fs_attr_##_name = {			\
+	.attr = {.name = __stringify(_name), .mode = _mode },	\
+	.show	= _show,					\
+	.store	= _store,					\
+	.struct_type = _struct_type,				\
+	.offset = _offset,					\
+	.size = _size						\
+}
+
+#define F2FS_RO_ATTR(struct_type, struct_name, name, elname)	\
+	F2FS_ATTR_OFFSET(struct_type, name, 0444,		\
+		f2fs_sbi_show, NULL,				\
+		offsetof(struct struct_name, elname),		\
+		sizeof_field(struct struct_name, elname))
+
+#define F2FS_RW_ATTR(struct_type, struct_name, name, elname)	\
+	F2FS_ATTR_OFFSET(struct_type, name, 0644,		\
+		f2fs_sbi_show, f2fs_sbi_store,			\
+		offsetof(struct struct_name, elname),		\
+		sizeof_field(struct struct_name, elname))
+
+#define F2FS_GENERAL_RO_ATTR(name) \
+static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
+
+#ifdef CONFIG_F2FS_STAT_FS
+#define STAT_INFO_RO_ATTR(name, elname)				\
+	F2FS_RO_ATTR(STAT_INFO, f2fs_stat_info, name, elname)
+#endif
+
+#define GC_THREAD_RW_ATTR(name, elname)				\
+	F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, name, elname)
+
+#define SM_INFO_RW_ATTR(name, elname)				\
+	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, name, elname)
+
+#define SM_INFO_GENERAL_RW_ATTR(elname)				\
+	SM_INFO_RW_ATTR(elname, elname)
+
+#define DCC_INFO_RW_ATTR(name, elname)				\
+	F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, name, elname)
+
+#define DCC_INFO_GENERAL_RW_ATTR(elname)			\
+	DCC_INFO_RW_ATTR(elname, elname)
+
+#define NM_INFO_RW_ATTR(name, elname)				\
+	F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, name, elname)
+
+#define NM_INFO_GENERAL_RW_ATTR(elname)				\
+	NM_INFO_RW_ATTR(elname, elname)
+
+#define F2FS_SBI_RW_ATTR(name, elname)				\
+	F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, name, elname)
+
+#define F2FS_SBI_GENERAL_RW_ATTR(elname)			\
+	F2FS_SBI_RW_ATTR(elname, elname)
+
+#define F2FS_SBI_GENERAL_RO_ATTR(elname)			\
+	F2FS_RO_ATTR(F2FS_SBI, f2fs_sb_info, elname, elname)
+
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+#define FAULT_INFO_GENERAL_RW_ATTR(type, elname)		\
+	F2FS_RW_ATTR(type, f2fs_fault_info, elname, elname)
+#endif
+
+#define RESERVED_BLOCKS_GENERAL_RW_ATTR(elname)			\
+	F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, elname, elname)
+
+#define CPRC_INFO_GENERAL_RW_ATTR(elname)			\
+	F2FS_RW_ATTR(CPRC_INFO, ckpt_req_control, elname, elname)
+
+#define ATGC_INFO_RW_ATTR(name, elname)				\
+	F2FS_RW_ATTR(ATGC_INFO, atgc_management, name, elname)
+
+/* GC_THREAD ATTR */
+GC_THREAD_RW_ATTR(gc_urgent_sleep_time, urgent_sleep_time);
+GC_THREAD_RW_ATTR(gc_min_sleep_time, min_sleep_time);
+GC_THREAD_RW_ATTR(gc_max_sleep_time, max_sleep_time);
+GC_THREAD_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time);
+GC_THREAD_RW_ATTR(gc_no_zoned_gc_percent, no_zoned_gc_percent);
+GC_THREAD_RW_ATTR(gc_boost_zoned_gc_percent, boost_zoned_gc_percent);
+GC_THREAD_RW_ATTR(gc_valid_thresh_ratio, valid_thresh_ratio);
+GC_THREAD_RW_ATTR(gc_boost_gc_multiple, boost_gc_multiple);
+GC_THREAD_RW_ATTR(gc_boost_gc_greedy, boost_gc_greedy);
+
+/* SM_INFO ATTR */
+SM_INFO_RW_ATTR(reclaim_segments, rec_prefree_segments);
+SM_INFO_GENERAL_RW_ATTR(ipu_policy);
+SM_INFO_GENERAL_RW_ATTR(min_ipu_util);
+SM_INFO_GENERAL_RW_ATTR(min_fsync_blocks);
+SM_INFO_GENERAL_RW_ATTR(min_seq_blocks);
+SM_INFO_GENERAL_RW_ATTR(min_hot_blocks);
+SM_INFO_GENERAL_RW_ATTR(min_ssr_sections);
+SM_INFO_GENERAL_RW_ATTR(reserved_segments);
+
+/* DCC_INFO ATTR */
+DCC_INFO_RW_ATTR(max_small_discards, max_discards);
+DCC_INFO_GENERAL_RW_ATTR(max_discard_request);
+DCC_INFO_GENERAL_RW_ATTR(min_discard_issue_time);
+DCC_INFO_GENERAL_RW_ATTR(mid_discard_issue_time);
+DCC_INFO_GENERAL_RW_ATTR(max_discard_issue_time);
+DCC_INFO_GENERAL_RW_ATTR(discard_io_aware_gran);
+DCC_INFO_GENERAL_RW_ATTR(discard_urgent_util);
+DCC_INFO_GENERAL_RW_ATTR(discard_granularity);
+DCC_INFO_GENERAL_RW_ATTR(max_ordered_discard);
+DCC_INFO_GENERAL_RW_ATTR(discard_io_aware);
+
+/* NM_INFO ATTR */
+NM_INFO_RW_ATTR(max_roll_forward_node_blocks, max_rf_node_blocks);
+NM_INFO_GENERAL_RW_ATTR(ram_thresh);
+NM_INFO_GENERAL_RW_ATTR(ra_nid_pages);
+NM_INFO_GENERAL_RW_ATTR(dirty_nats_ratio);
+
+/* F2FS_SBI ATTR */
+F2FS_RW_ATTR(F2FS_SBI, f2fs_super_block, extension_list, extension_list);
+F2FS_SBI_RW_ATTR(gc_idle, gc_mode);
+F2FS_SBI_RW_ATTR(gc_urgent, gc_mode);
+F2FS_SBI_RW_ATTR(cp_interval, interval_time[CP_TIME]);
+F2FS_SBI_RW_ATTR(idle_interval, interval_time[REQ_TIME]);
+F2FS_SBI_RW_ATTR(discard_idle_interval, interval_time[DISCARD_TIME]);
+F2FS_SBI_RW_ATTR(gc_idle_interval, interval_time[GC_TIME]);
+F2FS_SBI_RW_ATTR(umount_discard_timeout, interval_time[UMOUNT_DISCARD_TIMEOUT]);
+F2FS_SBI_RW_ATTR(gc_pin_file_thresh, gc_pin_file_threshold);
+F2FS_SBI_RW_ATTR(gc_reclaimed_segments, gc_reclaimed_segs);
+F2FS_SBI_RW_ATTR(max_atc_write_bio_size, max_atc_write_bio_size);
+F2FS_SBI_GENERAL_RW_ATTR(max_victim_search);
+F2FS_SBI_GENERAL_RW_ATTR(migration_granularity);
+F2FS_SBI_GENERAL_RW_ATTR(migration_window_granularity);
+F2FS_SBI_GENERAL_RW_ATTR(dir_level);
+F2FS_SBI_GENERAL_RW_ATTR(allocate_section_hint);
+F2FS_SBI_GENERAL_RW_ATTR(allocate_section_policy);
+#ifdef CONFIG_F2FS_IOSTAT
+F2FS_SBI_GENERAL_RW_ATTR(iostat_enable);
+F2FS_SBI_GENERAL_RW_ATTR(iostat_period_ms);
+#endif
+F2FS_SBI_GENERAL_RW_ATTR(readdir_ra);
+F2FS_SBI_GENERAL_RW_ATTR(max_io_bytes);
+F2FS_SBI_GENERAL_RW_ATTR(data_io_flag);
+F2FS_SBI_GENERAL_RW_ATTR(node_io_flag);
+F2FS_SBI_GENERAL_RW_ATTR(gc_remaining_trials);
+F2FS_SBI_GENERAL_RW_ATTR(seq_file_ra_mul);
+F2FS_SBI_GENERAL_RW_ATTR(gc_segment_mode);
+F2FS_SBI_GENERAL_RW_ATTR(max_fragment_chunk);
+F2FS_SBI_GENERAL_RW_ATTR(max_fragment_hole);
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+F2FS_SBI_GENERAL_RW_ATTR(compr_written_block);
+F2FS_SBI_GENERAL_RW_ATTR(compr_saved_block);
+F2FS_SBI_GENERAL_RW_ATTR(compr_new_inode);
+F2FS_SBI_GENERAL_RW_ATTR(compress_percent);
+F2FS_SBI_GENERAL_RW_ATTR(compress_watermark);
+#endif
+/* atomic write */
+F2FS_SBI_GENERAL_RO_ATTR(current_atomic_write);
+F2FS_SBI_GENERAL_RW_ATTR(peak_atomic_write);
+F2FS_SBI_GENERAL_RW_ATTR(committed_atomic_block);
+F2FS_SBI_GENERAL_RW_ATTR(revoked_atomic_block);
+/* block age extent cache */
+F2FS_SBI_GENERAL_RW_ATTR(hot_data_age_threshold);
+F2FS_SBI_GENERAL_RW_ATTR(warm_data_age_threshold);
+F2FS_SBI_GENERAL_RW_ATTR(last_age_weight);
+/* read extent cache */
+F2FS_SBI_GENERAL_RW_ATTR(max_read_extent_count);
+#ifdef CONFIG_BLK_DEV_ZONED
+F2FS_SBI_GENERAL_RO_ATTR(unusable_blocks_per_sec);
+F2FS_SBI_GENERAL_RO_ATTR(max_open_zones);
+F2FS_SBI_GENERAL_RW_ATTR(blkzone_alloc_policy);
+#endif
+F2FS_SBI_GENERAL_RW_ATTR(carve_out);
+F2FS_SBI_GENERAL_RW_ATTR(reserved_pin_section);
+F2FS_SBI_GENERAL_RO_ATTR(pinned_area_max_secno);
+F2FS_SBI_GENERAL_RW_ATTR(bggc_io_aware);
+F2FS_SBI_GENERAL_RW_ATTR(max_lock_elapsed_time);
+F2FS_SBI_GENERAL_RW_ATTR(lock_duration_priority);
+F2FS_SBI_GENERAL_RW_ATTR(adjust_lock_priority);
+F2FS_SBI_GENERAL_RW_ATTR(critical_task_priority);
+
+/* STAT_INFO ATTR */
+#ifdef CONFIG_F2FS_STAT_FS
+STAT_INFO_RO_ATTR(cp_foreground_calls, cp_call_count[FOREGROUND]);
+STAT_INFO_RO_ATTR(cp_background_calls, cp_call_count[BACKGROUND]);
+STAT_INFO_RO_ATTR(gc_foreground_calls, gc_call_count[FOREGROUND]);
+STAT_INFO_RO_ATTR(gc_background_calls, gc_call_count[BACKGROUND]);
+#endif
+
+/* FAULT_INFO ATTR */
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+FAULT_INFO_GENERAL_RW_ATTR(FAULT_INFO_RATE, inject_rate);
+FAULT_INFO_GENERAL_RW_ATTR(FAULT_INFO_TYPE, inject_type);
+FAULT_INFO_GENERAL_RW_ATTR(FAULT_INFO_TIMEOUT, inject_lock_timeout);
+#endif
+
+/* RESERVED_BLOCKS ATTR */
+RESERVED_BLOCKS_GENERAL_RW_ATTR(reserved_blocks);
+
+/* CPRC_INFO ATTR */
+CPRC_INFO_GENERAL_RW_ATTR(ckpt_thread_ioprio);
+
+/* ATGC_INFO ATTR */
+ATGC_INFO_RW_ATTR(atgc_candidate_ratio, candidate_ratio);
+ATGC_INFO_RW_ATTR(atgc_candidate_count, max_candidate_count);
+ATGC_INFO_RW_ATTR(atgc_age_weight, age_weight);
+ATGC_INFO_RW_ATTR(atgc_age_threshold, age_threshold);
+
+F2FS_GENERAL_RO_ATTR(dirty_segments);
+F2FS_GENERAL_RO_ATTR(free_segments);
+F2FS_GENERAL_RO_ATTR(ovp_segments);
+F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
+F2FS_GENERAL_RO_ATTR(features);
+F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
+F2FS_GENERAL_RO_ATTR(unusable);
+F2FS_GENERAL_RO_ATTR(encoding);
+F2FS_GENERAL_RO_ATTR(encoding_flags);
+F2FS_GENERAL_RO_ATTR(effective_lookup_mode);
+F2FS_GENERAL_RO_ATTR(mounted_time_sec);
+F2FS_GENERAL_RO_ATTR(main_blkaddr);
+F2FS_GENERAL_RO_ATTR(pending_discard);
+F2FS_GENERAL_RO_ATTR(atgc_enabled);
+F2FS_GENERAL_RO_ATTR(gc_mode);
+#ifdef CONFIG_F2FS_STAT_FS
+F2FS_GENERAL_RO_ATTR(moved_blocks_background);
+F2FS_GENERAL_RO_ATTR(moved_blocks_foreground);
+F2FS_GENERAL_RO_ATTR(avg_vblocks);
+F2FS_GENERAL_RO_ATTR(defrag_blocks);
+#endif
+
+#ifdef CONFIG_FS_ENCRYPTION
+F2FS_FEATURE_RO_ATTR(encryption);
+F2FS_FEATURE_RO_ATTR(test_dummy_encryption_v2);
+#if IS_ENABLED(CONFIG_UNICODE)
+F2FS_FEATURE_RO_ATTR(encrypted_casefold);
+#endif
+#endif /* CONFIG_FS_ENCRYPTION */
+#ifdef CONFIG_BLK_DEV_ZONED
+F2FS_FEATURE_RO_ATTR(block_zoned);
+#endif
+F2FS_FEATURE_RO_ATTR(atomic_write);
+F2FS_FEATURE_RO_ATTR(extra_attr);
+F2FS_FEATURE_RO_ATTR(project_quota);
+F2FS_FEATURE_RO_ATTR(inode_checksum);
+F2FS_FEATURE_RO_ATTR(flexible_inline_xattr);
+F2FS_FEATURE_RO_ATTR(quota_ino);
+F2FS_FEATURE_RO_ATTR(inode_crtime);
+F2FS_FEATURE_RO_ATTR(lost_found);
+#ifdef CONFIG_FS_VERITY
+F2FS_FEATURE_RO_ATTR(verity);
+#endif
+F2FS_FEATURE_RO_ATTR(sb_checksum);
+#if IS_ENABLED(CONFIG_UNICODE)
+F2FS_FEATURE_RO_ATTR(casefold);
+#endif
+F2FS_FEATURE_RO_ATTR(readonly);
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+F2FS_FEATURE_RO_ATTR(compression);
+#endif
+F2FS_FEATURE_RO_ATTR(pin_file);
+#ifdef CONFIG_UNICODE
+F2FS_FEATURE_RO_ATTR(linear_lookup);
+#endif
+F2FS_FEATURE_RO_ATTR(packed_ssa);
+F2FS_FEATURE_RO_ATTR(fserror);
+
+#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
+static struct attribute *f2fs_attrs[] = {
+	ATTR_LIST(gc_urgent_sleep_time),
+	ATTR_LIST(gc_min_sleep_time),
+	ATTR_LIST(gc_max_sleep_time),
+	ATTR_LIST(gc_no_gc_sleep_time),
+	ATTR_LIST(gc_no_zoned_gc_percent),
+	ATTR_LIST(gc_boost_zoned_gc_percent),
+	ATTR_LIST(gc_valid_thresh_ratio),
+	ATTR_LIST(gc_boost_gc_multiple),
+	ATTR_LIST(gc_boost_gc_greedy),
+	ATTR_LIST(gc_idle),
+	ATTR_LIST(gc_urgent),
+	ATTR_LIST(reclaim_segments),
+	ATTR_LIST(main_blkaddr),
+	ATTR_LIST(max_small_discards),
+	ATTR_LIST(max_discard_request),
+	ATTR_LIST(min_discard_issue_time),
+	ATTR_LIST(mid_discard_issue_time),
+	ATTR_LIST(max_discard_issue_time),
+	ATTR_LIST(discard_io_aware_gran),
+	ATTR_LIST(discard_urgent_util),
+	ATTR_LIST(discard_granularity),
+	ATTR_LIST(max_ordered_discard),
+	ATTR_LIST(discard_io_aware),
+	ATTR_LIST(pending_discard),
+	ATTR_LIST(gc_mode),
+	ATTR_LIST(ipu_policy),
+	ATTR_LIST(min_ipu_util),
+	ATTR_LIST(min_fsync_blocks),
+	ATTR_LIST(min_seq_blocks),
+	ATTR_LIST(min_hot_blocks),
+	ATTR_LIST(min_ssr_sections),
+	ATTR_LIST(reserved_segments),
+	ATTR_LIST(max_victim_search),
+	ATTR_LIST(migration_granularity),
+	ATTR_LIST(migration_window_granularity),
+	ATTR_LIST(dir_level),
+	ATTR_LIST(ram_thresh),
+	ATTR_LIST(ra_nid_pages),
+	ATTR_LIST(dirty_nats_ratio),
+	ATTR_LIST(max_roll_forward_node_blocks),
+	ATTR_LIST(cp_interval),
+	ATTR_LIST(idle_interval),
+	ATTR_LIST(discard_idle_interval),
+	ATTR_LIST(gc_idle_interval),
+	ATTR_LIST(umount_discard_timeout),
+	ATTR_LIST(bggc_io_aware),
+#ifdef CONFIG_F2FS_IOSTAT
+	ATTR_LIST(iostat_enable),
+	ATTR_LIST(iostat_period_ms),
+#endif
+	ATTR_LIST(readdir_ra),
+	ATTR_LIST(max_io_bytes),
+	ATTR_LIST(gc_pin_file_thresh),
+	ATTR_LIST(extension_list),
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	ATTR_LIST(inject_rate),
+	ATTR_LIST(inject_type),
+	ATTR_LIST(inject_lock_timeout),
+#endif
+	ATTR_LIST(data_io_flag),
+	ATTR_LIST(node_io_flag),
+	ATTR_LIST(gc_remaining_trials),
+	ATTR_LIST(ckpt_thread_ioprio),
+	ATTR_LIST(dirty_segments),
+	ATTR_LIST(free_segments),
+	ATTR_LIST(ovp_segments),
+	ATTR_LIST(unusable),
+	ATTR_LIST(lifetime_write_kbytes),
+	ATTR_LIST(features),
+	ATTR_LIST(reserved_blocks),
+	ATTR_LIST(current_reserved_blocks),
+	ATTR_LIST(encoding),
+	ATTR_LIST(encoding_flags),
+	ATTR_LIST(effective_lookup_mode),
+	ATTR_LIST(mounted_time_sec),
+#ifdef CONFIG_F2FS_STAT_FS
+	ATTR_LIST(cp_foreground_calls),
+	ATTR_LIST(cp_background_calls),
+	ATTR_LIST(gc_foreground_calls),
+	ATTR_LIST(gc_background_calls),
+	ATTR_LIST(moved_blocks_foreground),
+	ATTR_LIST(moved_blocks_background),
+	ATTR_LIST(avg_vblocks),
+	ATTR_LIST(defrag_blocks),
+#endif
+#ifdef CONFIG_BLK_DEV_ZONED
+	ATTR_LIST(unusable_blocks_per_sec),
+	ATTR_LIST(max_open_zones),
+	ATTR_LIST(blkzone_alloc_policy),
+#endif
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	ATTR_LIST(compr_written_block),
+	ATTR_LIST(compr_saved_block),
+	ATTR_LIST(compr_new_inode),
+	ATTR_LIST(compress_percent),
+	ATTR_LIST(compress_watermark),
+#endif
+	/* For ATGC */
+	ATTR_LIST(atgc_candidate_ratio),
+	ATTR_LIST(atgc_candidate_count),
+	ATTR_LIST(atgc_age_weight),
+	ATTR_LIST(atgc_age_threshold),
+	ATTR_LIST(atgc_enabled),
+	ATTR_LIST(seq_file_ra_mul),
+	ATTR_LIST(gc_segment_mode),
+	ATTR_LIST(gc_reclaimed_segments),
+	ATTR_LIST(max_atc_write_bio_size),
+	ATTR_LIST(max_fragment_chunk),
+	ATTR_LIST(max_fragment_hole),
+	ATTR_LIST(current_atomic_write),
+	ATTR_LIST(peak_atomic_write),
+	ATTR_LIST(committed_atomic_block),
+	ATTR_LIST(revoked_atomic_block),
+	ATTR_LIST(hot_data_age_threshold),
+	ATTR_LIST(warm_data_age_threshold),
+	ATTR_LIST(last_age_weight),
+	ATTR_LIST(max_read_extent_count),
+	ATTR_LIST(carve_out),
+	ATTR_LIST(reserved_pin_section),
+	ATTR_LIST(pinned_area_max_secno),
+	ATTR_LIST(allocate_section_hint),
+	ATTR_LIST(allocate_section_policy),
+	ATTR_LIST(max_lock_elapsed_time),
+	ATTR_LIST(lock_duration_priority),
+	ATTR_LIST(adjust_lock_priority),
+	ATTR_LIST(critical_task_priority),
+	NULL,
+};
+ATTRIBUTE_GROUPS(f2fs);
+
+#define BASE_ATTR_LIST(name) (&f2fs_base_attr_##name.attr)
+static struct attribute *f2fs_feat_attrs[] = {
+#ifdef CONFIG_FS_ENCRYPTION
+	BASE_ATTR_LIST(encryption),
+	BASE_ATTR_LIST(test_dummy_encryption_v2),
+#if IS_ENABLED(CONFIG_UNICODE)
+	BASE_ATTR_LIST(encrypted_casefold),
+#endif
+#endif /* CONFIG_FS_ENCRYPTION */
+#ifdef CONFIG_BLK_DEV_ZONED
+	BASE_ATTR_LIST(block_zoned),
+#endif
+	BASE_ATTR_LIST(atomic_write),
+	BASE_ATTR_LIST(extra_attr),
+	BASE_ATTR_LIST(project_quota),
+	BASE_ATTR_LIST(inode_checksum),
+	BASE_ATTR_LIST(flexible_inline_xattr),
+	BASE_ATTR_LIST(quota_ino),
+	BASE_ATTR_LIST(inode_crtime),
+	BASE_ATTR_LIST(lost_found),
+#ifdef CONFIG_FS_VERITY
+	BASE_ATTR_LIST(verity),
+#endif
+	BASE_ATTR_LIST(sb_checksum),
+#if IS_ENABLED(CONFIG_UNICODE)
+	BASE_ATTR_LIST(casefold),
+#endif
+	BASE_ATTR_LIST(readonly),
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	BASE_ATTR_LIST(compression),
+#endif
+	BASE_ATTR_LIST(pin_file),
+#ifdef CONFIG_UNICODE
+	BASE_ATTR_LIST(linear_lookup),
+#endif
+	BASE_ATTR_LIST(packed_ssa),
+	BASE_ATTR_LIST(fserror),
+	NULL,
+};
+ATTRIBUTE_GROUPS(f2fs_feat);
+
+F2FS_GENERAL_RO_ATTR(sb_status);
+F2FS_GENERAL_RO_ATTR(cp_status);
+F2FS_GENERAL_RO_ATTR(issued_discard);
+F2FS_GENERAL_RO_ATTR(queued_discard);
+F2FS_GENERAL_RO_ATTR(undiscard_blks);
+
+static struct attribute *f2fs_stat_attrs[] = {
+	ATTR_LIST(sb_status),
+	ATTR_LIST(cp_status),
+	ATTR_LIST(issued_discard),
+	ATTR_LIST(queued_discard),
+	ATTR_LIST(undiscard_blks),
+	NULL,
+};
+ATTRIBUTE_GROUPS(f2fs_stat);
+
+F2FS_SB_FEATURE_RO_ATTR(encryption, ENCRYPT);
+F2FS_SB_FEATURE_RO_ATTR(block_zoned, BLKZONED);
+F2FS_SB_FEATURE_RO_ATTR(extra_attr, EXTRA_ATTR);
+F2FS_SB_FEATURE_RO_ATTR(project_quota, PRJQUOTA);
+F2FS_SB_FEATURE_RO_ATTR(inode_checksum, INODE_CHKSUM);
+F2FS_SB_FEATURE_RO_ATTR(flexible_inline_xattr, FLEXIBLE_INLINE_XATTR);
+F2FS_SB_FEATURE_RO_ATTR(quota_ino, QUOTA_INO);
+F2FS_SB_FEATURE_RO_ATTR(inode_crtime, INODE_CRTIME);
+F2FS_SB_FEATURE_RO_ATTR(lost_found, LOST_FOUND);
+F2FS_SB_FEATURE_RO_ATTR(verity, VERITY);
+F2FS_SB_FEATURE_RO_ATTR(sb_checksum, SB_CHKSUM);
+F2FS_SB_FEATURE_RO_ATTR(casefold, CASEFOLD);
+F2FS_SB_FEATURE_RO_ATTR(compression, COMPRESSION);
+F2FS_SB_FEATURE_RO_ATTR(readonly, RO);
+F2FS_SB_FEATURE_RO_ATTR(device_alias, DEVICE_ALIAS);
+F2FS_SB_FEATURE_RO_ATTR(packed_ssa, PACKED_SSA);
+
+static struct attribute *f2fs_sb_feat_attrs[] = {
+	ATTR_LIST(sb_encryption),
+	ATTR_LIST(sb_block_zoned),
+	ATTR_LIST(sb_extra_attr),
+	ATTR_LIST(sb_project_quota),
+	ATTR_LIST(sb_inode_checksum),
+	ATTR_LIST(sb_flexible_inline_xattr),
+	ATTR_LIST(sb_quota_ino),
+	ATTR_LIST(sb_inode_crtime),
+	ATTR_LIST(sb_lost_found),
+	ATTR_LIST(sb_verity),
+	ATTR_LIST(sb_sb_checksum),
+	ATTR_LIST(sb_casefold),
+	ATTR_LIST(sb_compression),
+	ATTR_LIST(sb_readonly),
+	ATTR_LIST(sb_device_alias),
+	ATTR_LIST(sb_packed_ssa),
+	NULL,
+};
+ATTRIBUTE_GROUPS(f2fs_sb_feat);
+
+F2FS_TUNE_RW_ATTR(reclaim_caches_kb);
+
+static struct attribute *f2fs_tune_attrs[] = {
+	BASE_ATTR_LIST(reclaim_caches_kb),
+	NULL,
+};
+ATTRIBUTE_GROUPS(f2fs_tune);
+
+static const struct sysfs_ops f2fs_attr_ops = {
+	.show	= f2fs_attr_show,
+	.store	= f2fs_attr_store,
+};
+
+static const struct kobj_type f2fs_sb_ktype = {
+	.default_groups = f2fs_groups,
+	.sysfs_ops	= &f2fs_attr_ops,
+	.release	= f2fs_sb_release,
+};
+
+static const struct kobj_type f2fs_ktype = {
+	.sysfs_ops	= &f2fs_attr_ops,
+};
+
+static struct kset f2fs_kset = {
+	.kobj	= {.ktype = &f2fs_ktype},
+};
+
+static const struct sysfs_ops f2fs_feat_attr_ops = {
+	.show	= f2fs_base_attr_show,
+	.store	= f2fs_base_attr_store,
+};
+
+static const struct kobj_type f2fs_feat_ktype = {
+	.default_groups = f2fs_feat_groups,
+	.sysfs_ops	= &f2fs_feat_attr_ops,
+};
+
+static struct kobject f2fs_feat = {
+	.kset	= &f2fs_kset,
+};
+
+static const struct sysfs_ops f2fs_tune_attr_ops = {
+	.show	= f2fs_base_attr_show,
+	.store	= f2fs_base_attr_store,
+};
+
+static const struct kobj_type f2fs_tune_ktype = {
+	.default_groups = f2fs_tune_groups,
+	.sysfs_ops	= &f2fs_tune_attr_ops,
+};
+
+static struct kobject f2fs_tune = {
+	.kset	= &f2fs_kset,
+};
+
+static ssize_t f2fs_stat_attr_show(struct kobject *kobj,
+				struct attribute *attr, char *buf)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+								s_stat_kobj);
+	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+	return a->show ? a->show(a, sbi, buf) : 0;
+}
+
+static ssize_t f2fs_stat_attr_store(struct kobject *kobj, struct attribute *attr,
+						const char *buf, size_t len)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+								s_stat_kobj);
+	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+	return a->store ? a->store(a, sbi, buf, len) : 0;
+}
+
+static void f2fs_stat_kobj_release(struct kobject *kobj)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+								s_stat_kobj);
+	complete(&sbi->s_stat_kobj_unregister);
+}
+
+static const struct sysfs_ops f2fs_stat_attr_ops = {
+	.show	= f2fs_stat_attr_show,
+	.store	= f2fs_stat_attr_store,
+};
+
+static const struct kobj_type f2fs_stat_ktype = {
+	.default_groups = f2fs_stat_groups,
+	.sysfs_ops	= &f2fs_stat_attr_ops,
+	.release	= f2fs_stat_kobj_release,
+};
+
+static ssize_t f2fs_sb_feat_attr_show(struct kobject *kobj,
+				struct attribute *attr, char *buf)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+							s_feature_list_kobj);
+	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+	return a->show ? a->show(a, sbi, buf) : 0;
+}
+
+static void f2fs_feature_list_kobj_release(struct kobject *kobj)
+{
+	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+							s_feature_list_kobj);
+	complete(&sbi->s_feature_list_kobj_unregister);
+}
+
+static const struct sysfs_ops f2fs_feature_list_attr_ops = {
+	.show	= f2fs_sb_feat_attr_show,
+};
+
+static const struct kobj_type f2fs_feature_list_ktype = {
+	.default_groups = f2fs_sb_feat_groups,
+	.sysfs_ops	= &f2fs_feature_list_attr_ops,
+	.release	= f2fs_feature_list_kobj_release,
+};
+
+static int __maybe_unused segment_info_seq_show(struct seq_file *seq,
+						void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	unsigned int total_segs =
+			le32_to_cpu(sbi->raw_super->segment_count_main);
+	int i;
+
+	seq_puts(seq, "format: segment_type|valid_blocks\n"
+		"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
+
+	for (i = 0; i < total_segs; i++) {
+		struct seg_entry *se = get_seg_entry(sbi, i);
+
+		if ((i % 10) == 0)
+			seq_printf(seq, "%-10d", i);
+		seq_printf(seq, "%d|%-3u", se->type, se->valid_blocks);
+		if ((i % 10) == 9 || i == (total_segs - 1))
+			seq_putc(seq, '\n');
+		else
+			seq_putc(seq, ' ');
+	}
+
+	return 0;
+}
+
+static int __maybe_unused segment_bits_seq_show(struct seq_file *seq,
+						void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	unsigned int total_segs =
+			le32_to_cpu(sbi->raw_super->segment_count_main);
+	int i, j;
+
+	seq_puts(seq, "format: segment_type|valid_blocks|bitmaps|mtime\n"
+		"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
+
+	for (i = 0; i < total_segs; i++) {
+		struct seg_entry *se = get_seg_entry(sbi, i);
+
+		seq_printf(seq, "%-10d", i);
+		seq_printf(seq, "%d|%-3u|", se->type, se->valid_blocks);
+		for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
+			seq_printf(seq, " %.2x", se->cur_valid_map[j]);
+		seq_printf(seq, "| %llx", se->mtime);
+		seq_putc(seq, '\n');
+	}
+	return 0;
+}
+
+static int __maybe_unused victim_bits_seq_show(struct seq_file *seq,
+						void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
+	int i;
+
+	seq_puts(seq, "format: victim_secmap bitmaps\n");
+
+	for (i = 0; i < MAIN_SECS(sbi); i++) {
+		if ((i % 10) == 0)
+			seq_printf(seq, "%-10d", i);
+		seq_printf(seq, "%d", test_bit(i, dirty_i->victim_secmap) ? 1 : 0);
+		if ((i % 10) == 9 || i == (MAIN_SECS(sbi) - 1))
+			seq_putc(seq, '\n');
+		else
+			seq_putc(seq, ' ');
+	}
+	return 0;
+}
+
+static int __maybe_unused discard_plist_seq_show(struct seq_file *seq,
+						void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+	int i, count;
+
+	seq_puts(seq, "Discard pend list(Show diacrd_cmd count on each entry, .:not exist):\n");
+	if (!f2fs_realtime_discard_enable(sbi))
+		return 0;
+
+	if (dcc) {
+		mutex_lock(&dcc->cmd_lock);
+		for (i = 0; i < MAX_PLIST_NUM; i++) {
+			struct list_head *pend_list;
+			struct discard_cmd *dc, *tmp;
+
+			if (i % 8 == 0)
+				seq_printf(seq, "  %-3d", i);
+			count = 0;
+			pend_list = &dcc->pend_list[i];
+			list_for_each_entry_safe(dc, tmp, pend_list, list)
+				count++;
+			if (count)
+				seq_printf(seq, " %7d", count);
+			else
+				seq_puts(seq, "       .");
+			if (i % 8 == 7)
+				seq_putc(seq, '\n');
+		}
+		seq_putc(seq, '\n');
+		mutex_unlock(&dcc->cmd_lock);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused disk_map_seq_show(struct seq_file *seq,
+						void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	int i;
+
+	seq_printf(seq, "Address Layout   : %5luB Block address (# of Segments)\n",
+					F2FS_BLKSIZE);
+	seq_printf(seq, " SB            : %12s\n", "0/1024B");
+	seq_printf(seq, " seg0_blkaddr  : 0x%010x\n", SEG0_BLKADDR(sbi));
+	seq_printf(seq, " Checkpoint    : 0x%010x (%10d)\n",
+			le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_blkaddr), 2);
+	seq_printf(seq, " SIT           : 0x%010x (%10d)\n",
+			SIT_I(sbi)->sit_base_addr,
+			le32_to_cpu(F2FS_RAW_SUPER(sbi)->segment_count_sit));
+	seq_printf(seq, " NAT           : 0x%010x (%10d)\n",
+			NM_I(sbi)->nat_blkaddr,
+			le32_to_cpu(F2FS_RAW_SUPER(sbi)->segment_count_nat));
+	seq_printf(seq, " SSA           : 0x%010x (%10d)\n",
+			SM_I(sbi)->ssa_blkaddr,
+			le32_to_cpu(F2FS_RAW_SUPER(sbi)->segment_count_ssa));
+	seq_printf(seq, " Main          : 0x%010x (%10d)\n",
+			SM_I(sbi)->main_blkaddr,
+			le32_to_cpu(F2FS_RAW_SUPER(sbi)->segment_count_main));
+	seq_printf(seq, " Block size    : %12lu KB\n", F2FS_BLKSIZE >> 10);
+	seq_printf(seq, " Segment size  : %12d MB\n",
+			(BLKS_PER_SEG(sbi) << (F2FS_BLKSIZE_BITS - 10)) >> 10);
+	seq_printf(seq, " Segs/Sections : %12d\n",
+			SEGS_PER_SEC(sbi));
+	seq_printf(seq, " Section size  : %12d MB\n",
+			(BLKS_PER_SEC(sbi) << (F2FS_BLKSIZE_BITS - 10)) >> 10);
+	seq_printf(seq, " # of Sections : %12d\n",
+			le32_to_cpu(F2FS_RAW_SUPER(sbi)->section_count));
+
+	if (!f2fs_is_multi_device(sbi))
+		return 0;
+
+	seq_puts(seq, "\nDisk Map for multi devices:\n");
+	for (i = 0; i < sbi->s_ndevs; i++)
+		seq_printf(seq, "Disk:%2d (zoned=%d): 0x%010x - 0x%010x on %s\n",
+			i, bdev_is_zoned(FDEV(i).bdev),
+			FDEV(i).start_blk, FDEV(i).end_blk,
+			FDEV(i).path);
+	return 0;
+}
+
+static int __maybe_unused donation_list_seq_show(struct seq_file *seq,
+						void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct inode *inode;
+	struct f2fs_inode_info *fi;
+	struct dentry *dentry;
+	char *buf, *path;
+	int i;
+
+	buf = f2fs_getname(sbi);
+	if (!buf)
+		return 0;
+
+	seq_printf(seq, "Donation List\n");
+	seq_printf(seq, " # of files  : %u\n", sbi->donate_files);
+	seq_printf(seq, " %-50s %10s %20s %20s %22s\n",
+			"File path", "Status", "Donation offset (kb)",
+			"Donation size (kb)", "File cached size (kb)");
+	seq_printf(seq, "---\n");
+
+	for (i = 0; i < sbi->donate_files; i++) {
+		spin_lock(&sbi->inode_lock[DONATE_INODE]);
+		if (list_empty(&sbi->inode_list[DONATE_INODE])) {
+			spin_unlock(&sbi->inode_lock[DONATE_INODE]);
+			break;
+		}
+		fi = list_first_entry(&sbi->inode_list[DONATE_INODE],
+					struct f2fs_inode_info, gdonate_list);
+		list_move_tail(&fi->gdonate_list, &sbi->inode_list[DONATE_INODE]);
+		inode = igrab(&fi->vfs_inode);
+		spin_unlock(&sbi->inode_lock[DONATE_INODE]);
+
+		if (!inode)
+			continue;
+
+		inode_lock_shared(inode);
+
+		dentry = d_find_alias(inode);
+		if (!dentry) {
+			path = NULL;
+		} else {
+			path = dentry_path_raw(dentry, buf, PATH_MAX);
+			if (IS_ERR(path))
+				goto next;
+		}
+		seq_printf(seq, " %-50s %10s %20llu %20llu %22llu\n",
+				path ? path : "<unlinked>",
+				is_inode_flag_set(inode, FI_DONATE_FINISHED) ?
+				"Evicted" : "Donated",
+				(loff_t)fi->donate_start << (PAGE_SHIFT - 10),
+				(loff_t)(fi->donate_end + 1) << (PAGE_SHIFT - 10),
+				(loff_t)inode->i_mapping->nrpages << (PAGE_SHIFT - 10));
+next:
+		dput(dentry);
+		inode_unlock_shared(inode);
+		iput(inode);
+	}
+	f2fs_putname(buf);
+	return 0;
+}
+
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+static int __maybe_unused inject_stats_seq_show(struct seq_file *seq,
+						void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_fault_info *ffi = &F2FS_OPTION(sbi).fault_info;
+	int i;
+
+	seq_puts(seq, "fault_type		injected_count\n");
+
+	for (i = 0; i < FAULT_MAX; i++)
+		seq_printf(seq, "%-24s%-10u\n", f2fs_fault_name[i],
+						ffi->inject_count[i]);
+	return 0;
+}
+#endif
+
+int __init f2fs_init_sysfs(void)
+{
+	int ret;
+
+	kobject_set_name(&f2fs_kset.kobj, "f2fs");
+	f2fs_kset.kobj.parent = fs_kobj;
+	ret = kset_register(&f2fs_kset);
+	if (ret)
+		return ret;
+
+	ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
+				   NULL, "features");
+	if (ret)
+		goto unregister_kset;
+
+	ret = kobject_init_and_add(&f2fs_tune, &f2fs_tune_ktype,
+				   NULL, "tuning");
+	if (ret)
+		goto put_feat;
+
+	f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
+	if (!f2fs_proc_root) {
+		ret = -ENOMEM;
+		goto put_tune;
+	}
+
+	return 0;
+
+put_tune:
+	kobject_put(&f2fs_tune);
+put_feat:
+	kobject_put(&f2fs_feat);
+unregister_kset:
+	kset_unregister(&f2fs_kset);
+	return ret;
+}
+
+void f2fs_exit_sysfs(void)
+{
+	kobject_put(&f2fs_tune);
+	kobject_put(&f2fs_feat);
+	kset_unregister(&f2fs_kset);
+	remove_proc_entry("fs/f2fs", NULL);
+	f2fs_proc_root = NULL;
+}
+
+int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
+{
+	struct super_block *sb = sbi->sb;
+	int err;
+
+	sbi->s_kobj.kset = &f2fs_kset;
+	init_completion(&sbi->s_kobj_unregister);
+	err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
+				"%s", sb->s_id);
+	if (err)
+		goto put_sb_kobj;
+
+	sbi->s_stat_kobj.kset = &f2fs_kset;
+	init_completion(&sbi->s_stat_kobj_unregister);
+	err = kobject_init_and_add(&sbi->s_stat_kobj, &f2fs_stat_ktype,
+						&sbi->s_kobj, "stat");
+	if (err)
+		goto put_stat_kobj;
+
+	sbi->s_feature_list_kobj.kset = &f2fs_kset;
+	init_completion(&sbi->s_feature_list_kobj_unregister);
+	err = kobject_init_and_add(&sbi->s_feature_list_kobj,
+					&f2fs_feature_list_ktype,
+					&sbi->s_kobj, "feature_list");
+	if (err)
+		goto put_feature_list_kobj;
+
+	sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
+	if (!sbi->s_proc) {
+		err = -ENOMEM;
+		goto put_feature_list_kobj;
+	}
+
+	proc_create_single_data("segment_info", 0444, sbi->s_proc,
+				segment_info_seq_show, sb);
+	proc_create_single_data("segment_bits", 0444, sbi->s_proc,
+				segment_bits_seq_show, sb);
+#ifdef CONFIG_F2FS_IOSTAT
+	proc_create_single_data("iostat_info", 0444, sbi->s_proc,
+				iostat_info_seq_show, sb);
+#endif
+	proc_create_single_data("victim_bits", 0444, sbi->s_proc,
+				victim_bits_seq_show, sb);
+	proc_create_single_data("discard_plist_info", 0444, sbi->s_proc,
+				discard_plist_seq_show, sb);
+	proc_create_single_data("disk_map", 0444, sbi->s_proc,
+				disk_map_seq_show, sb);
+	proc_create_single_data("donation_list", 0444, sbi->s_proc,
+				donation_list_seq_show, sb);
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	proc_create_single_data("inject_stats", 0444, sbi->s_proc,
+				inject_stats_seq_show, sb);
+#endif
+	return 0;
+put_feature_list_kobj:
+	kobject_put(&sbi->s_feature_list_kobj);
+	wait_for_completion(&sbi->s_feature_list_kobj_unregister);
+put_stat_kobj:
+	kobject_put(&sbi->s_stat_kobj);
+	wait_for_completion(&sbi->s_stat_kobj_unregister);
+put_sb_kobj:
+	kobject_put(&sbi->s_kobj);
+	wait_for_completion(&sbi->s_kobj_unregister);
+	return err;
+}
+
+void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
+{
+	remove_proc_subtree(sbi->sb->s_id, f2fs_proc_root);
+
+	kobject_put(&sbi->s_stat_kobj);
+	wait_for_completion(&sbi->s_stat_kobj_unregister);
+	kobject_put(&sbi->s_feature_list_kobj);
+	wait_for_completion(&sbi->s_feature_list_kobj_unregister);
+
+	kobject_put(&sbi->s_kobj);
+	wait_for_completion(&sbi->s_kobj_unregister);
+}