[PATCH 5.19 114/717] f2fs: flush pending checkpoints when freezing super

Greg Kroah-Hartman
2022-10-22T07:46:59Z

From: Jaegeuk Kim <jaegeuk@kernel.org>

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>
---
fs/f2fs/checkpoint.c | 24 ++++++++++++++++++------
fs/f2fs/f2fs.h | 1 +
fs/f2fs/super.c | 5 ++---
3 files changed, 21 insertions(+), 9 deletions(-)

--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1894,15 +1894,27 @@ int f2fs_start_ckpt_thread(struct f2fs_s
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)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3676,6 +3676,7 @@ static inline bool f2fs_need_rand_seg(st
* 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);
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1637,9 +1637,8 @@ static int f2fs_freeze(struct super_bloc
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);