f2fs: separate out iostat feature

Added F2FS_IOSTAT config option to support getting IO statistics through
sysfs and printing out periodic IO statistics tracepoint events and
moved I/O statistics related codes into separate files for better
maintenance.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
[Jaegeuk Kim: set default=y]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

13 files changed, 223 insertions, 149 deletions

diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig
index 2ac026fc3564..7eea3cfd894d 100644
--- a/fs/f2fs/Kconfig
+++ b/fs/f2fs/Kconfig
@@ -133,3 +133,12 @@ config F2FS_FS_ZSTD
 	default y
 	help
 	  Support ZSTD compress algorithm, if unsure, say Y.
+
+config F2FS_IOSTAT
+	bool "F2FS IO statistics information"
+	depends on F2FS_FS
+	default y
+	help
+	  Support getting IO statistics through sysfs and printing out periodic
+	  IO statistics tracepoint events. You have to turn on "iostat_enable"
+	  sysfs node to enable this feature.
diff --git a/fs/f2fs/Makefile b/fs/f2fs/Makefile
index e5295746208b..8a7322d229e4 100644
--- a/fs/f2fs/Makefile
+++ b/fs/f2fs/Makefile
@@ -9,3 +9,4 @@ f2fs-$(CONFIG_F2FS_FS_XATTR) += xattr.o
 f2fs-$(CONFIG_F2FS_FS_POSIX_ACL) += acl.o
 f2fs-$(CONFIG_FS_VERITY) += verity.o
 f2fs-$(CONFIG_F2FS_FS_COMPRESSION) += compress.o
+f2fs-$(CONFIG_F2FS_IOSTAT) += iostat.o
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 41960c55c343..3962cfeb4a57 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -18,6 +18,7 @@
 #include "f2fs.h"
 #include "node.h"
 #include "segment.h"
+#include "iostat.h"
 #include <trace/events/f2fs.h>
 
 #define DEFAULT_CHECKPOINT_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index e4e4eb800d2b..fd16c4fc4507 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -25,6 +25,7 @@
 #include "f2fs.h"
 #include "node.h"
 #include "segment.h"
+#include "iostat.h"
 #include <trace/events/f2fs.h>
 
 #define NUM_PREALLOC_POST_READ_CTXS	128
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index fe5f280f6ac0..12ecf6ee9cb5 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1713,14 +1713,6 @@ struct f2fs_sb_info {
 #endif
 	spinlock_t stat_lock;			/* lock for stat operations */
 
-	/* For app/fs IO statistics */
-	spinlock_t iostat_lock;
-	unsigned long long rw_iostat[NR_IO_TYPE];
-	unsigned long long prev_rw_iostat[NR_IO_TYPE];
-	bool iostat_enable;
-	unsigned long iostat_next_period;
-	unsigned int iostat_period_ms;
-
 	/* to attach REQ_META|REQ_FUA flags */
 	unsigned int data_io_flag;
 	unsigned int node_io_flag;
@@ -1780,6 +1772,16 @@ struct f2fs_sb_info {
 	unsigned int compress_watermark;	/* cache page watermark */
 	atomic_t compress_page_hit;		/* cache hit count */
 #endif
+
+#ifdef CONFIG_F2FS_IOSTAT
+	/* For app/fs IO statistics */
+	spinlock_t iostat_lock;
+	unsigned long long rw_iostat[NR_IO_TYPE];
+	unsigned long long prev_rw_iostat[NR_IO_TYPE];
+	bool iostat_enable;
+	unsigned long iostat_next_period;
+	unsigned int iostat_period_ms;
+#endif
 };
 
 struct f2fs_private_dio {
@@ -3257,47 +3259,6 @@ static inline int get_inline_xattr_addrs(struct inode *inode)
 		sizeof((f2fs_inode)->field))			\
 		<= (F2FS_OLD_ATTRIBUTE_SIZE + (extra_isize)))	\
 
-#define DEFAULT_IOSTAT_PERIOD_MS	3000
-#define MIN_IOSTAT_PERIOD_MS		100
-/* maximum period of iostat tracing is 1 day */
-#define MAX_IOSTAT_PERIOD_MS		8640000
-
-static inline void f2fs_reset_iostat(struct f2fs_sb_info *sbi)
-{
-	int i;
-
-	spin_lock(&sbi->iostat_lock);
-	for (i = 0; i < NR_IO_TYPE; i++) {
-		sbi->rw_iostat[i] = 0;
-		sbi->prev_rw_iostat[i] = 0;
-	}
-	spin_unlock(&sbi->iostat_lock);
-}
-
-extern void f2fs_record_iostat(struct f2fs_sb_info *sbi);
-
-static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi,
-			enum iostat_type type, unsigned long long io_bytes)
-{
-	if (!sbi->iostat_enable)
-		return;
-	spin_lock(&sbi->iostat_lock);
-	sbi->rw_iostat[type] += io_bytes;
-
-	if (type == APP_WRITE_IO || type == APP_DIRECT_IO)
-		sbi->rw_iostat[APP_BUFFERED_IO] =
-			sbi->rw_iostat[APP_WRITE_IO] -
-			sbi->rw_iostat[APP_DIRECT_IO];
-
-	if (type == APP_READ_IO || type == APP_DIRECT_READ_IO)
-		sbi->rw_iostat[APP_BUFFERED_READ_IO] =
-			sbi->rw_iostat[APP_READ_IO] -
-			sbi->rw_iostat[APP_DIRECT_READ_IO];
-	spin_unlock(&sbi->iostat_lock);
-
-	f2fs_record_iostat(sbi);
-}
-
 #define __is_large_section(sbi)		((sbi)->segs_per_sec > 1)
 
 #define __is_meta_io(fio) (PAGE_TYPE_OF_BIO((fio)->type) == META)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index d4fc5e0d2ffe..ab4ea2ddcc8b 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -31,6 +31,7 @@
 #include "xattr.h"
 #include "acl.h"
 #include "gc.h"
+#include "iostat.h"
 #include <trace/events/f2fs.h>
 #include <uapi/linux/f2fs.h>
 
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 3bc0f0162e31..2c18443972b6 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -19,6 +19,7 @@
 #include "node.h"
 #include "segment.h"
 #include "gc.h"
+#include "iostat.h"
 #include <trace/events/f2fs.h>
 
 static struct kmem_cache *victim_entry_slab;
diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c
new file mode 100644
index 000000000000..21c29e121a86
--- /dev/null
+++ b/fs/f2fs/iostat.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * f2fs iostat support
+ *
+ * Copyright 2021 Google LLC
+ * Author: Daeho Jeong <daehojeong@google.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+#include <linux/seq_file.h>
+
+#include "f2fs.h"
+#include "iostat.h"
+#include <trace/events/f2fs.h>
+
+int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
+{
+	struct super_block *sb = seq->private;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	time64_t now = ktime_get_real_seconds();
+
+	if (!sbi->iostat_enable)
+		return 0;
+
+	seq_printf(seq, "time:		%-16llu\n", now);
+
+	/* print app write IOs */
+	seq_puts(seq, "[WRITE]\n");
+	seq_printf(seq, "app buffered:	%-16llu\n",
+				sbi->rw_iostat[APP_BUFFERED_IO]);
+	seq_printf(seq, "app direct:	%-16llu\n",
+				sbi->rw_iostat[APP_DIRECT_IO]);
+	seq_printf(seq, "app mapped:	%-16llu\n",
+				sbi->rw_iostat[APP_MAPPED_IO]);
+
+	/* print fs write IOs */
+	seq_printf(seq, "fs data:	%-16llu\n",
+				sbi->rw_iostat[FS_DATA_IO]);
+	seq_printf(seq, "fs node:	%-16llu\n",
+				sbi->rw_iostat[FS_NODE_IO]);
+	seq_printf(seq, "fs meta:	%-16llu\n",
+				sbi->rw_iostat[FS_META_IO]);
+	seq_printf(seq, "fs gc data:	%-16llu\n",
+				sbi->rw_iostat[FS_GC_DATA_IO]);
+	seq_printf(seq, "fs gc node:	%-16llu\n",
+				sbi->rw_iostat[FS_GC_NODE_IO]);
+	seq_printf(seq, "fs cp data:	%-16llu\n",
+				sbi->rw_iostat[FS_CP_DATA_IO]);
+	seq_printf(seq, "fs cp node:	%-16llu\n",
+				sbi->rw_iostat[FS_CP_NODE_IO]);
+	seq_printf(seq, "fs cp meta:	%-16llu\n",
+				sbi->rw_iostat[FS_CP_META_IO]);
+
+	/* print app read IOs */
+	seq_puts(seq, "[READ]\n");
+	seq_printf(seq, "app buffered:	%-16llu\n",
+				sbi->rw_iostat[APP_BUFFERED_READ_IO]);
+	seq_printf(seq, "app direct:	%-16llu\n",
+				sbi->rw_iostat[APP_DIRECT_READ_IO]);
+	seq_printf(seq, "app mapped:	%-16llu\n",
+				sbi->rw_iostat[APP_MAPPED_READ_IO]);
+
+	/* print fs read IOs */
+	seq_printf(seq, "fs data:	%-16llu\n",
+				sbi->rw_iostat[FS_DATA_READ_IO]);
+	seq_printf(seq, "fs gc data:	%-16llu\n",
+				sbi->rw_iostat[FS_GDATA_READ_IO]);
+	seq_printf(seq, "fs compr_data:	%-16llu\n",
+				sbi->rw_iostat[FS_CDATA_READ_IO]);
+	seq_printf(seq, "fs node:	%-16llu\n",
+				sbi->rw_iostat[FS_NODE_READ_IO]);
+	seq_printf(seq, "fs meta:	%-16llu\n",
+				sbi->rw_iostat[FS_META_READ_IO]);
+
+	/* print other IOs */
+	seq_puts(seq, "[OTHER]\n");
+	seq_printf(seq, "fs discard:	%-16llu\n",
+				sbi->rw_iostat[FS_DISCARD]);
+
+	return 0;
+}
+
+static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi)
+{
+	unsigned long long iostat_diff[NR_IO_TYPE];
+	int i;
+
+	if (time_is_after_jiffies(sbi->iostat_next_period))
+		return;
+
+	/* Need double check under the lock */
+	spin_lock(&sbi->iostat_lock);
+	if (time_is_after_jiffies(sbi->iostat_next_period)) {
+		spin_unlock(&sbi->iostat_lock);
+		return;
+	}
+	sbi->iostat_next_period = jiffies +
+				msecs_to_jiffies(sbi->iostat_period_ms);
+
+	for (i = 0; i < NR_IO_TYPE; i++) {
+		iostat_diff[i] = sbi->rw_iostat[i] -
+				sbi->prev_rw_iostat[i];
+		sbi->prev_rw_iostat[i] = sbi->rw_iostat[i];
+	}
+	spin_unlock(&sbi->iostat_lock);
+
+	trace_f2fs_iostat(sbi, iostat_diff);
+}
+
+void f2fs_reset_iostat(struct f2fs_sb_info *sbi)
+{
+	int i;
+
+	spin_lock(&sbi->iostat_lock);
+	for (i = 0; i < NR_IO_TYPE; i++) {
+		sbi->rw_iostat[i] = 0;
+		sbi->prev_rw_iostat[i] = 0;
+	}
+	spin_unlock(&sbi->iostat_lock);
+}
+
+void f2fs_update_iostat(struct f2fs_sb_info *sbi,
+			enum iostat_type type, unsigned long long io_bytes)
+{
+	if (!sbi->iostat_enable)
+		return;
+
+	spin_lock(&sbi->iostat_lock);
+	sbi->rw_iostat[type] += io_bytes;
+
+	if (type == APP_WRITE_IO || type == APP_DIRECT_IO)
+		sbi->rw_iostat[APP_BUFFERED_IO] =
+			sbi->rw_iostat[APP_WRITE_IO] -
+			sbi->rw_iostat[APP_DIRECT_IO];
+
+	if (type == APP_READ_IO || type == APP_DIRECT_READ_IO)
+		sbi->rw_iostat[APP_BUFFERED_READ_IO] =
+			sbi->rw_iostat[APP_READ_IO] -
+			sbi->rw_iostat[APP_DIRECT_READ_IO];
+	spin_unlock(&sbi->iostat_lock);
+
+	f2fs_record_iostat(sbi);
+}
+
+int f2fs_init_iostat(struct f2fs_sb_info *sbi)
+{
+	/* init iostat info */
+	spin_lock_init(&sbi->iostat_lock);
+	sbi->iostat_enable = false;
+	sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS;
+
+	return 0;
+}
diff --git a/fs/f2fs/iostat.h b/fs/f2fs/iostat.h
new file mode 100644
index 000000000000..46e4a36fc8e9
--- /dev/null
+++ b/fs/f2fs/iostat.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2021 Google LLC
+ * Author: Daeho Jeong <daehojeong@google.com>
+ */
+#ifndef __F2FS_IOSTAT_H__
+#define __F2FS_IOSTAT_H__
+
+#ifdef CONFIG_F2FS_IOSTAT
+
+#define DEFAULT_IOSTAT_PERIOD_MS	3000
+#define MIN_IOSTAT_PERIOD_MS		100
+/* maximum period of iostat tracing is 1 day */
+#define MAX_IOSTAT_PERIOD_MS		8640000
+
+extern int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
+			void *offset);
+extern void f2fs_reset_iostat(struct f2fs_sb_info *sbi);
+extern void f2fs_update_iostat(struct f2fs_sb_info *sbi,
+			enum iostat_type type, unsigned long long io_bytes);
+extern int f2fs_init_iostat(struct f2fs_sb_info *sbi);
+#else
+static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi,
+		enum iostat_type type, unsigned long long io_bytes) {}
+static inline int f2fs_init_iostat(struct f2fs_sb_info *sbi) { return 0; }
+#endif
+#endif /* __F2FS_IOSTAT_H__ */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 161173de5a2d..043cb831b289 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -17,6 +17,7 @@
 #include "node.h"
 #include "segment.h"
 #include "xattr.h"
+#include "iostat.h"
 #include <trace/events/f2fs.h>
 
 #define on_f2fs_build_free_nids(nmi) mutex_is_locked(&(nm_i)->build_lock)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index b4dd22134a73..73abec9988e9 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -20,6 +20,7 @@
 #include "segment.h"
 #include "node.h"
 #include "gc.h"
+#include "iostat.h"
 #include <trace/events/f2fs.h>
 
 #define __reverse_ffz(x) __reverse_ffs(~(x))
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index b556ca38f0fb..a23926d1a77b 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -33,6 +33,7 @@
 #include "segment.h"
 #include "xattr.h"
 #include "gc.h"
+#include "iostat.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/f2fs.h>
@@ -3964,11 +3965,6 @@ try_onemore:
 	set_sbi_flag(sbi, SBI_POR_DOING);
 	spin_lock_init(&sbi->stat_lock);
 
-	/* init iostat info */
-	spin_lock_init(&sbi->iostat_lock);
-	sbi->iostat_enable = false;
-	sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS;
-
 	for (i = 0; i < NR_PAGE_TYPE; i++) {
 		int n = (i == META) ? 1 : NR_TEMP_TYPE;
 		int j;
@@ -3999,6 +3995,10 @@ try_onemore:
 	init_waitqueue_head(&sbi->cp_wait);
 	init_sb_info(sbi);
 
+	err = f2fs_init_iostat(sbi);
+	if (err)
+		goto free_bio_info;
+
 	err = init_percpu_info(sbi);
 	if (err)
 		goto free_bio_info;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 36d7e40bf12e..a1a3e0f6d658 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -17,6 +17,7 @@
 #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;
@@ -477,6 +478,7 @@ out:
 		return count;
 	}
 
+#ifdef CONFIG_F2FS_IOSTAT
 	if (!strcmp(a->attr.name, "iostat_enable")) {
 		sbi->iostat_enable = !!t;
 		if (!sbi->iostat_enable)
@@ -492,6 +494,7 @@ out:
 		spin_unlock(&sbi->iostat_lock);
 		return count;
 	}
+#endif
 
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 	if (!strcmp(a->attr.name, "compr_written_block") ||
@@ -700,8 +703,10 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, discard_idle_interval,
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle_interval, interval_time[GC_TIME]);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info,
 		umount_discard_timeout, interval_time[UMOUNT_DISCARD_TIMEOUT]);
+#ifdef CONFIG_F2FS_IOSTAT
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_period_ms, iostat_period_ms);
+#endif
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_io_bytes, max_io_bytes);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
@@ -807,8 +812,10 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(discard_idle_interval),
 	ATTR_LIST(gc_idle_interval),
 	ATTR_LIST(umount_discard_timeout),
+#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),
@@ -1076,101 +1083,6 @@ static int __maybe_unused segment_bits_seq_show(struct seq_file *seq,
 	return 0;
 }
 
-void f2fs_record_iostat(struct f2fs_sb_info *sbi)
-{
-	unsigned long long iostat_diff[NR_IO_TYPE];
-	int i;
-
-	if (time_is_after_jiffies(sbi->iostat_next_period))
-		return;
-
-	/* Need double check under the lock */
-	spin_lock(&sbi->iostat_lock);
-	if (time_is_after_jiffies(sbi->iostat_next_period)) {
-		spin_unlock(&sbi->iostat_lock);
-		return;
-	}
-	sbi->iostat_next_period = jiffies +
-				msecs_to_jiffies(sbi->iostat_period_ms);
-
-	for (i = 0; i < NR_IO_TYPE; i++) {
-		iostat_diff[i] = sbi->rw_iostat[i] -
-				sbi->prev_rw_iostat[i];
-		sbi->prev_rw_iostat[i] = sbi->rw_iostat[i];
-	}
-	spin_unlock(&sbi->iostat_lock);
-
-	trace_f2fs_iostat(sbi, iostat_diff);
-}
-
-static int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
-					       void *offset)
-{
-	struct super_block *sb = seq->private;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
-	time64_t now = ktime_get_real_seconds();
-
-	if (!sbi->iostat_enable)
-		return 0;
-
-	seq_printf(seq, "time:		%-16llu\n", now);
-
-	/* print app write IOs */
-	seq_puts(seq, "[WRITE]\n");
-	seq_printf(seq, "app buffered:	%-16llu\n",
-				sbi->rw_iostat[APP_BUFFERED_IO]);
-	seq_printf(seq, "app direct:	%-16llu\n",
-				sbi->rw_iostat[APP_DIRECT_IO]);
-	seq_printf(seq, "app mapped:	%-16llu\n",
-				sbi->rw_iostat[APP_MAPPED_IO]);
-
-	/* print fs write IOs */
-	seq_printf(seq, "fs data:	%-16llu\n",
-				sbi->rw_iostat[FS_DATA_IO]);
-	seq_printf(seq, "fs node:	%-16llu\n",
-				sbi->rw_iostat[FS_NODE_IO]);
-	seq_printf(seq, "fs meta:	%-16llu\n",
-				sbi->rw_iostat[FS_META_IO]);
-	seq_printf(seq, "fs gc data:	%-16llu\n",
-				sbi->rw_iostat[FS_GC_DATA_IO]);
-	seq_printf(seq, "fs gc node:	%-16llu\n",
-				sbi->rw_iostat[FS_GC_NODE_IO]);
-	seq_printf(seq, "fs cp data:	%-16llu\n",
-				sbi->rw_iostat[FS_CP_DATA_IO]);
-	seq_printf(seq, "fs cp node:	%-16llu\n",
-				sbi->rw_iostat[FS_CP_NODE_IO]);
-	seq_printf(seq, "fs cp meta:	%-16llu\n",
-				sbi->rw_iostat[FS_CP_META_IO]);
-
-	/* print app read IOs */
-	seq_puts(seq, "[READ]\n");
-	seq_printf(seq, "app buffered:	%-16llu\n",
-				sbi->rw_iostat[APP_BUFFERED_READ_IO]);
-	seq_printf(seq, "app direct:	%-16llu\n",
-				sbi->rw_iostat[APP_DIRECT_READ_IO]);
-	seq_printf(seq, "app mapped:	%-16llu\n",
-				sbi->rw_iostat[APP_MAPPED_READ_IO]);
-
-	/* print fs read IOs */
-	seq_printf(seq, "fs data:	%-16llu\n",
-				sbi->rw_iostat[FS_DATA_READ_IO]);
-	seq_printf(seq, "fs gc data:	%-16llu\n",
-				sbi->rw_iostat[FS_GDATA_READ_IO]);
-	seq_printf(seq, "fs compr_data:	%-16llu\n",
-				sbi->rw_iostat[FS_CDATA_READ_IO]);
-	seq_printf(seq, "fs node:	%-16llu\n",
-				sbi->rw_iostat[FS_NODE_READ_IO]);
-	seq_printf(seq, "fs meta:	%-16llu\n",
-				sbi->rw_iostat[FS_META_READ_IO]);
-
-	/* print other IOs */
-	seq_puts(seq, "[OTHER]\n");
-	seq_printf(seq, "fs discard:	%-16llu\n",
-				sbi->rw_iostat[FS_DISCARD]);
-
-	return 0;
-}
-
 static int __maybe_unused victim_bits_seq_show(struct seq_file *seq,
 						void *offset)
 {
@@ -1257,8 +1169,10 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
 				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);
 	}
@@ -1278,7 +1192,9 @@ put_sb_kobj:
 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
 {
 	if (sbi->s_proc) {
+#ifdef CONFIG_F2FS_IOSTAT
 		remove_proc_entry("iostat_info", sbi->s_proc);
+#endif
 		remove_proc_entry("segment_info", sbi->s_proc);
 		remove_proc_entry("segment_bits", sbi->s_proc);
 		remove_proc_entry("victim_bits", sbi->s_proc);