f2fs: flush pending checkpoints when freezing super

commit c7b58576370147833999fd4cc874d0f918bdf9ca upstream.

This avoids -EINVAL when trying to freeze f2fs.

Cc: stable@vger.kernel.org
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index f2fe494..2046c1f 100644 (file)
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1892,15 +1892,27 @@ int f2fs_start_ckpt_thread(struct f2fs_sb_info *sbi)
 void f2fs_stop_ckpt_thread(struct f2fs_sb_info *sbi)
 {
        struct ckpt_req_control *cprc = &sbi->cprc_info;
+       struct task_struct *ckpt_task;
 
-       if (cprc->f2fs_issue_ckpt) {
-               struct task_struct *ckpt_task = cprc->f2fs_issue_ckpt;
+       if (!cprc->f2fs_issue_ckpt)
+               return;
 
-               cprc->f2fs_issue_ckpt = NULL;
-               kthread_stop(ckpt_task);
+       ckpt_task = cprc->f2fs_issue_ckpt;
+       cprc->f2fs_issue_ckpt = NULL;
+       kthread_stop(ckpt_task);
 
-               flush_remained_ckpt_reqs(sbi, NULL);
-       }
+       f2fs_flush_ckpt_thread(sbi);
+}
+
+void f2fs_flush_ckpt_thread(struct f2fs_sb_info *sbi)
+{
+       struct ckpt_req_control *cprc = &sbi->cprc_info;
+
+       flush_remained_ckpt_reqs(sbi, NULL);
+
+       /* Let's wait for the previous dispatched checkpoint. */
+       while (atomic_read(&cprc->queued_ckpt))
+               io_schedule_timeout(DEFAULT_IO_TIMEOUT);
 }
 
 void f2fs_init_ckpt_req_control(struct f2fs_sb_info *sbi)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a0e1e29..9a3f2e3 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3540,6 +3540,7 @@ unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
  * checkpoint.c
  */
 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io);
+void f2fs_flush_ckpt_thread(struct f2fs_sb_info *sbi);
 struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index);
 struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index);
 struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index);

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ba032eb..59215c4 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1661,9 +1661,8 @@ static int f2fs_freeze(struct super_block *sb)
        if (is_sbi_flag_set(F2FS_SB(sb), SBI_IS_DIRTY))
                return -EINVAL;
 
-       /* ensure no checkpoint required */
-       if (!llist_empty(&F2FS_SB(sb)->cprc_info.issue_list))
-               return -EINVAL;
+       /* Let's flush checkpoints and stop the thread. */
+       f2fs_flush_ckpt_thread(F2FS_SB(sb));
 
        /* to avoid deadlock on f2fs_evict_inode->SB_FREEZE_FS */
        set_sbi_flag(F2FS_SB(sb), SBI_IS_FREEZING);