[PATCH v2 3/7] f2fs: add reserved_segments sysfs node

[Daeho Jeong]

From: Daeho Jeong <daehojeong@xxxxxxxxxx>

For the fine tuning of GC behavior, add reserved_segments sysfs node.

Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++
 fs/f2fs/sysfs.c                         | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 9165f617d216..deff703035e1 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -771,3 +771,9 @@ Description:	Controls migration window granularity of garbage collection on larg
 		section. it can control the scanning window granularity for GC migration
 		in a unit of segment, while migration_granularity controls the number
 		of segments which can be migrated at the same turn.
+
+What:		/sys/fs/f2fs/<disk>/reserved_segments
+Date:		September 2024
+Contact:	"Daeho Jeong" <daehojeong@xxxxxxxxxx>
+Description:	In order to fine tune GC behavior, we can control the number of
+		reserved segments.
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 66d15609d5ad..761d1abd46a8 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -974,6 +974,7 @@ 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);
@@ -1144,6 +1145,7 @@ static struct attribute *f2fs_attrs[] = {
 	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),
-- 
2.46.0.598.g6f2099f65c-goog