f2fs: give up CP_TRIMMED_FLAG if it drops discards

In ->umount, once we drop remained discard entries, we should not
set CP_TRIMMED_FLAG with another checkpoint.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 3173d03..dac50d8 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2553,7 +2553,7 @@ void init_discard_policy(struct discard_policy *dpolicy, int discard_type,
                                                unsigned int granularity);
 void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new);
 void stop_discard_thread(struct f2fs_sb_info *sbi);
-void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
+bool 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 d661403..bfbcff8 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1196,12 +1196,13 @@ skip:
        return issued;
 }
 
-static void __drop_discard_cmd(struct f2fs_sb_info *sbi)
+static bool __drop_discard_cmd(struct f2fs_sb_info *sbi)
 {
        struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
        struct list_head *pend_list;
        struct discard_cmd *dc, *tmp;
        int i;
+       bool dropped = false;
 
        mutex_lock(&dcc->cmd_lock);
        for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
@@ -1209,9 +1210,12 @@ static void __drop_discard_cmd(struct f2fs_sb_info *sbi)
                list_for_each_entry_safe(dc, tmp, pend_list, list) {
                        f2fs_bug_on(sbi, dc->state != D_PREP);
                        __remove_discard_cmd(sbi, dc);
+                       dropped = true;
                }
        }
        mutex_unlock(&dcc->cmd_lock);
+
+       return dropped;
 }
 
 static void __wait_one_discard_bio(struct f2fs_sb_info *sbi,
@@ -1306,15 +1310,18 @@ void stop_discard_thread(struct f2fs_sb_info *sbi)
 }
 
 /* This comes from f2fs_put_super */
-void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
+bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
 {
        struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
        struct discard_policy dpolicy;
+       bool dropped;
 
        init_discard_policy(&dpolicy, DPOLICY_UMOUNT, dcc->discard_granularity);
        __issue_discard_cmd(sbi, &dpolicy);
-       __drop_discard_cmd(sbi);
+       dropped = __drop_discard_cmd(sbi);
        __wait_all_discard_cmd(sbi, &dpolicy);
+
+       return dropped;
 }
 
 static int issue_discard_thread(void *data)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f98a07c..3a47b32 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -781,6 +781,7 @@ static void f2fs_put_super(struct super_block *sb)
 {
        struct f2fs_sb_info *sbi = F2FS_SB(sb);
        int i;
+       bool dropped;
 
        f2fs_quota_off_umount(sb);
 
@@ -801,9 +802,9 @@ static void f2fs_put_super(struct super_block *sb)
        }
 
        /* be sure to wait for any on-going discard commands */
-       f2fs_wait_discard_bios(sbi);
+       dropped = f2fs_wait_discard_bios(sbi);
 
-       if (f2fs_discard_en(sbi) && !sbi->discard_blks) {
+       if (f2fs_discard_en(sbi) && !sbi->discard_blks && !dropped) {
                struct cp_control cpc = {
                        .reason = CP_UMOUNT | CP_TRIMMED,
                };