[PATCH 2/4] f2fs: introduce f2fs_wait_discard_bios

[Chao Yu]

Split f2fs_wait_discard_bios from f2fs_wait_discard_bio, just for cleanup,
no logic change.

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
 fs/f2fs/f2fs.h    |  2 +-
 fs/f2fs/segment.c | 38 ++++++++++++++++++++++----------------
 fs/f2fs/super.c   |  2 +-
 3 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d3c052f2ad66..054c72da466f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2189,7 +2189,7 @@ void destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free);
 void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr);
 bool is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr);
 void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new);
-void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr);
+void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
 void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc);
 void release_discard_addrs(struct f2fs_sb_info *sbi);
 int npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 152356fc60c0..4d345897b1ce 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -784,15 +784,10 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
 {
 	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 	struct list_head *pend_list = &(dcc->discard_pend_list);
-	struct list_head *wait_list = &(dcc->discard_wait_list);
 	struct discard_cmd *dc, *tmp;
-	struct blk_plug plug;
 
 	mutex_lock(&dcc->cmd_lock);
 
-	if (blkaddr == NULL_ADDR)
-		goto release_discard;
-
 	list_for_each_entry_safe(dc, tmp, pend_list, list) {
 		if (dc->lstart <= blkaddr && blkaddr < dc->lstart + dc->len) {
 			if (dc->state == D_SUBMIT)
@@ -801,19 +796,30 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
 		}
 	}
 
-release_discard:
-	/* this comes from f2fs_put_super */
-	if (blkaddr == NULL_ADDR) {
-		blk_start_plug(&plug);
-		list_for_each_entry_safe(dc, tmp, pend_list, list)
-			__submit_discard_cmd(sbi, dc);
-		blk_finish_plug(&plug);
+	mutex_unlock(&dcc->cmd_lock);
+}
 
-		list_for_each_entry_safe(dc, tmp, wait_list, list) {
-			wait_for_completion_io(&dc->wait);
-			__remove_discard_cmd(sbi, dc);
-		}
+/* This comes from f2fs_put_super */
+void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
+{
+	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+	struct list_head *pend_list = &(dcc->discard_pend_list);
+	struct list_head *wait_list = &(dcc->discard_wait_list);
+	struct discard_cmd *dc, *tmp;
+	struct blk_plug plug;
+
+	mutex_lock(&dcc->cmd_lock);
+
+	blk_start_plug(&plug);
+	list_for_each_entry_safe(dc, tmp, pend_list, list)
+		__submit_discard_cmd(sbi, dc);
+	blk_finish_plug(&plug);
+
+	list_for_each_entry_safe(dc, tmp, wait_list, list) {
+		wait_for_completion_io(&dc->wait);
+		__remove_discard_cmd(sbi, dc);
 	}
+
 	mutex_unlock(&dcc->cmd_lock);
 }
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 32f08aeddcc5..6677cea131dc 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -790,7 +790,7 @@ static void f2fs_put_super(struct super_block *sb)
 	}
 
 	/* be sure to wait for any on-going discard commands */
-	f2fs_wait_discard_bio(sbi, NULL_ADDR);
+	f2fs_wait_discard_bios(sbi);
 
 	/* write_checkpoint can update stat informaion */
 	f2fs_destroy_stats(sbi);
-- 
2.8.2.295.g3f1c1d0