[PATCH] f2fs: show more discard stat by sysfs

[Zhiguo Niu <zhiguo.niu@unisoc.com>]

The current pending_discard attr just only shows the discard_cmd_cnt
information, which is not very meaningful. More discard information
can be shown so that we can check them through sysfs when needed.

Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
---
 fs/f2fs/sysfs.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 417fae96..f98e680 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -134,13 +134,22 @@ static ssize_t cp_status_show(struct f2fs_attr *a,
 	return sysfs_emit(buf, "%x\n", le32_to_cpu(F2FS_CKPT(sbi)->ckpt_flags));
 }
 
-static ssize_t pending_discard_show(struct f2fs_attr *a,
+static ssize_t discard_stat_show(struct f2fs_attr *a,
 		struct f2fs_sb_info *sbi, char *buf)
 {
-	if (!SM_I(sbi)->dcc_info)
+	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
+	if (!dcc)
 		return -EINVAL;
-	return sysfs_emit(buf, "%llu\n", (unsigned long long)atomic_read(
-				&SM_I(sbi)->dcc_info->discard_cmd_cnt));
+
+	return sysfs_emit(buf, "%llu, %llu, %llu, %u\n",
+			(unsigned long long)atomic_read(
+				&dcc->discard_cmd_cnt),
+			(unsigned long long)atomic_read(
+				&dcc->issued_discard),
+			(unsigned long long)atomic_read(
+				&dcc->queued_discard),
+			dcc->undiscard_blks);
 }
 
 static ssize_t gc_mode_show(struct f2fs_attr *a,
@@ -1016,7 +1025,7 @@ static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a,
 F2FS_GENERAL_RO_ATTR(encoding);
 F2FS_GENERAL_RO_ATTR(mounted_time_sec);
 F2FS_GENERAL_RO_ATTR(main_blkaddr);
-F2FS_GENERAL_RO_ATTR(pending_discard);
+F2FS_GENERAL_RO_ATTR(discard_stat);
 F2FS_GENERAL_RO_ATTR(gc_mode);
 #ifdef CONFIG_F2FS_STAT_FS
 F2FS_GENERAL_RO_ATTR(moved_blocks_background);
@@ -1074,7 +1083,7 @@ static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a,
 	ATTR_LIST(discard_urgent_util),
 	ATTR_LIST(discard_granularity),
 	ATTR_LIST(max_ordered_discard),
-	ATTR_LIST(pending_discard),
+	ATTR_LIST(discard_stat),
 	ATTR_LIST(gc_mode),
 	ATTR_LIST(ipu_policy),
 	ATTR_LIST(min_ipu_util),
-- 
1.9.1