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Subject[PATCH] f2fs: fix to flush all dirty inodes during recovery
Date
From: Chao Yu <yuchao0@huawei.com>

generic/417 reported as blow:

------------[ cut here ]------------
kernel BUG at /home/yuchao/git/devf2fs/inode.c:695!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 1 PID: 21697 Comm: umount Tainted: G W O 4.18.0-rc2+ #39
Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
EIP: f2fs_evict_inode+0x556/0x580 [f2fs]
Call Trace:
? _raw_spin_unlock+0x2c/0x50
evict+0xa8/0x170
dispose_list+0x34/0x40
evict_inodes+0x118/0x120
generic_shutdown_super+0x41/0x100
? rcu_read_lock_sched_held+0x97/0xa0
kill_block_super+0x22/0x50
kill_f2fs_super+0x6f/0x80 [f2fs]
deactivate_locked_super+0x3d/0x70
deactivate_super+0x40/0x60
cleanup_mnt+0x39/0x70
__cleanup_mnt+0x10/0x20
task_work_run+0x81/0xa0
exit_to_usermode_loop+0x59/0xa7
do_fast_syscall_32+0x1f5/0x22c
entry_SYSENTER_32+0x53/0x86
EIP: f2fs_evict_inode+0x556/0x580 [f2fs]

It can simply reproduced with scripts:

1. mkfs.f2fs /dev/zram0
2. mount -t f2fs /dev/zram0 /mnt/f2fs
3. xfs_io -f /mnt/f2fs/file -c "pwrite 0 4k" -c "fsync"
4. godown /mnt/f2fs
5. umount /mnt/f2fs
6. mount -t f2fs -o ro /dev/zram0 /mnt/f2fs
7. umount /mnt/f2fs

The reason is: during recovery, i_{c,m}time of inode will be updated, then
the inode can be set dirty w/o being tracked in sbi->inode_list[DIRTY_META]
global list, so later write_checkpoint will not flush such dirty inode into
node page.

Once umount is called, sync_filesystem() in generic_shutdown_super() will
skip sync dirty inodes due to sb_rdonly check, leaving dirty inodes there.

To solve this issue, add sync_inodes_sb() in recovery to make sure all
dirty inodes will be flushed before write_checkpoint().

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/recovery.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 95511ed11a22..7812121ab057 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -701,6 +701,9 @@ int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
struct cp_control cpc = {
.reason = CP_RECOVERY,
};
+
+ sync_inodes_sb(sbi->sb);
+
err = f2fs_write_checkpoint(sbi, &cpc);
}

--
2.18.0
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