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f2fs: flush pending checkpoints when freezing super 

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>
This commit is contained in:
Jaegeuk Kim 2022-08-19 15:52:02 -07:00
parent 265576181b
commit c7b5857637
3 changed files with 21 additions and 9 deletions
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24
fs/f2fs/checkpoint.c
View File

@ -1893,15 +1893,27 @@ 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)

1
fs/f2fs/f2fs.h
View File

@ -3711,6 +3711,7 @@ static inline bool f2fs_need_rand_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);

5
fs/f2fs/super.c
View File

@ -1671,9 +1671,8 @@ 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);