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f2fs: fix to drop all dirty pages during umount() if cp_error is set

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[ Upstream commit c9b3649a93 ]

xfstest generic/361 reports a bug as below:

f2fs_bug_on(sbi, sbi->fsync_node_num);

kernel BUG at fs/f2fs/super.c:1627!
RIP: 0010:f2fs_put_super+0x3a8/0x3b0
Call Trace:
 generic_shutdown_super+0x8c/0x1b0
 kill_block_super+0x2b/0x60
 kill_f2fs_super+0x87/0x110
 deactivate_locked_super+0x39/0x80
 deactivate_super+0x46/0x50
 cleanup_mnt+0x109/0x170
 __cleanup_mnt+0x16/0x20
 task_work_run+0x65/0xa0
 exit_to_user_mode_prepare+0x175/0x190
 syscall_exit_to_user_mode+0x25/0x50
 do_syscall_64+0x4c/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

During umount(), if cp_error is set, f2fs_wait_on_all_pages() should
not stop waiting all F2FS_WB_CP_DATA pages to be writebacked, otherwise,
fsync_node_num can be non-zero after f2fs_wait_on_all_pages() causing
this bug.

In this case, to avoid deadloop in f2fs_wait_on_all_pages(), it needs
to drop all dirty pages rather than redirtying them.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chao Yu 2023-04-10 10:12:22 +08:00 committed by Greg Kroah-Hartman
parent 8659c5f4ff
commit 4ceedc2f8b
2 changed files with 12 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
fs/f2fs/checkpoint.c
View file

@ -306,8 +306,15 @@ static int __f2fs_write_meta_page(struct page *page,
trace_f2fs_writepage(page, META);
if (unlikely(f2fs_cp_error(sbi)))
if (unlikely(f2fs_cp_error(sbi))) {
if (is_sbi_flag_set(sbi, SBI_IS_CLOSE)) {
ClearPageUptodate(page);
dec_page_count(sbi, F2FS_DIRTY_META);
unlock_page(page);
return 0;
}
goto redirty_out;
}
if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
goto redirty_out;
if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
@ -1277,7 +1284,8 @@ void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
if (!get_pages(sbi, type))
break;
if (unlikely(f2fs_cp_error(sbi)))
if (unlikely(f2fs_cp_error(sbi) &&
!is_sbi_flag_set(sbi, SBI_IS_CLOSE)))
break;
io_schedule_timeout(HZ/50);

3
fs/f2fs/data.c
View file

@ -2130,7 +2130,8 @@ static int __write_data_page(struct page *page, bool *submitted,
* don't drop any dirty dentry pages for keeping lastest
* directory structure.
*/
if (S_ISDIR(inode->i_mode))
if (S_ISDIR(inode->i_mode) &&
!is_sbi_flag_set(sbi, SBI_IS_CLOSE))
goto redirty_out;
goto out;
}