f2fs: fix to propagate error from f2fs_enable_checkpoint()

[ Upstream commit be112e7449a6e1b54aa9feac618825d154b3a5c7 ]

In order to let userspace detect such error rather than suffering
silent failure.

Fixes: 4354994f097d ("f2fs: checkpoint disabling")
Cc: stable@kernel.org
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f103d979a65a41a58caaf18cec3d4240cdfd3b4e..3001ad8df5d1be97d273dc34d301def4d4ecc1f4 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2282,10 +2282,11 @@ restore_flag:
        return err;
 }
 
-static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
+static int f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
 {
        unsigned int nr_pages = get_pages(sbi, F2FS_DIRTY_DATA) / 16;
        long long start, writeback, end;
+       int ret;
 
        f2fs_info(sbi, "f2fs_enable_checkpoint() starts, meta: %lld, node: %lld, data: %lld",
                                        get_pages(sbi, F2FS_DIRTY_META),
@@ -2319,7 +2320,9 @@ static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
        set_sbi_flag(sbi, SBI_IS_DIRTY);
        f2fs_up_write(&sbi->gc_lock);
 
-       f2fs_sync_fs(sbi->sb, 1);
+       ret = f2fs_sync_fs(sbi->sb, 1);
+       if (ret)
+               f2fs_err(sbi, "%s sync_fs failed, ret: %d", __func__, ret);
 
        /* Let's ensure there's no pending checkpoint anymore */
        f2fs_flush_ckpt_thread(sbi);
@@ -2329,6 +2332,7 @@ static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
        f2fs_info(sbi, "f2fs_enable_checkpoint() finishes, writeback:%llu, sync:%llu",
                                        ktime_ms_delta(writeback, start),
                                        ktime_ms_delta(end, writeback));
+       return ret;
 }
 
 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
@@ -2543,7 +2547,9 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
                                goto restore_discard;
                        need_enable_checkpoint = true;
                } else {
-                       f2fs_enable_checkpoint(sbi);
+                       err = f2fs_enable_checkpoint(sbi);
+                       if (err)
+                               goto restore_discard;
                        need_disable_checkpoint = true;
                }
        }
@@ -2585,7 +2591,8 @@ skip:
        return 0;
 restore_checkpoint:
        if (need_enable_checkpoint) {
-               f2fs_enable_checkpoint(sbi);
+               if (f2fs_enable_checkpoint(sbi))
+                       f2fs_warn(sbi, "checkpoint has not been enabled");
        } else if (need_disable_checkpoint) {
                if (f2fs_disable_checkpoint(sbi))
                        f2fs_warn(sbi, "checkpoint has not been disabled");
@@ -4836,13 +4843,12 @@ reset_checkpoint:
        if (err)
                goto sync_free_meta;
 
-       if (test_opt(sbi, DISABLE_CHECKPOINT)) {
+       if (test_opt(sbi, DISABLE_CHECKPOINT))
                err = f2fs_disable_checkpoint(sbi);
-               if (err)
-                       goto sync_free_meta;
-       } else if (is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)) {
-               f2fs_enable_checkpoint(sbi);
-       }
+       else if (is_set_ckpt_flags(sbi, CP_DISABLED_FLAG))
+               err = f2fs_enable_checkpoint(sbi);
+       if (err)
+               goto sync_free_meta;
 
        /*
         * If filesystem is not mounted as read-only then