f2fs: expose # of overprivision segments

This is useful when checking conditions during checkpoint=disable in Android. Reviewed-by: Chao Yu <[email protected]> Signed-off-by: Jaegeuk Kim <[email protected]> Change-Id: Id6232d1095d4cddd69e7274b19859081f78fae68
reocat · Jan 5, 2024 · a2c6648 · a2c6648
1 parent ef4e822
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diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -327,6 +327,11 @@ Description:	Give a way to change checkpoint merge daemon's io priority.
 		and set the I/O priority within valid range of it. "," delimiter
 		is necessary in between I/O class and priority number.
 
+What:		/sys/fs/f2fs/<disk>/ovp_segments
+Date:		March 2021
+Contact:	"Jaegeuk Kim" <[email protected]>
+Description:	Shows the number of overprovision segments.
+
 What:		/sys/fs/f2fs/<disk>/atgc_candidate_ratio
 Date:		May 2021
 Contact:	"Chao Yu" <[email protected]>

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
@@ -99,6 +99,13 @@ static ssize_t reserved_segments_show(struct f2fs_attr *a,
 		(unsigned long long)(reserved_segments(sbi)));
 }
 
+static ssize_t ovp_segments_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sprintf(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)
 {
@@ -682,6 +689,7 @@ F2FS_RW_ATTR(CPRC_INFO, ckpt_req_control, ckpt_thread_ioprio, ckpt_thread_ioprio
 F2FS_GENERAL_RO_ATTR(dirty_segments);
 F2FS_GENERAL_RO_ATTR(free_segments);
 F2FS_GENERAL_RO_ATTR(reserved_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);
@@ -775,6 +783,7 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(dirty_segments),
 	ATTR_LIST(free_segments),
 	ATTR_LIST(reserved_segments),
+	ATTR_LIST(ovp_segments),
 	ATTR_LIST(unusable),
 	ATTR_LIST(lifetime_write_kbytes),
 	ATTR_LIST(features),