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Subject[PATCH v2] f2fs: fix to set superblock dirty correctly
Date
From: Chao Yu <yuchao0@huawei.com>

tests/generic/251 of fstest suit complains us with below message:

------------[ cut here ]------------
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 2 PID: 7698 Comm: fstrim Tainted: G O 4.7.0+ #21
task: e9f4e000 task.stack: e7262000
EIP: 0060:[<f89fcefe>] EFLAGS: 00010202 CPU: 2
EIP is at write_checkpoint+0xfde/0x1020 [f2fs]
EAX: f33eb300 EBX: eecac310 ECX: 00000001 EDX: ffff0001
ESI: eecac000 EDI: eecac5f0 EBP: e7263dec ESP: e7263d18
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 80050033 CR2: b76ab01c CR3: 2eb89de0 CR4: 000406f0
Stack:
00000001 a220fb7b e9f4e000 00000002 419ff2d3 b3a05151 00000002 e9f4e5d8
e9f4e000 419ff2d3 b3a05151 eecac310 c10b8154 b3a05151 419ff2d3 c10b78bd
e9f4e000 e9f4e000 e9f4e5d8 00000001 e9f4e000 ec409000 eecac2cc eecac288
Call Trace:
[<c10b8154>] ? __lock_acquire+0x3c4/0x760
[<c10b78bd>] ? mark_held_locks+0x5d/0x80
[<f8a10632>] f2fs_trim_fs+0x1c2/0x2e0 [f2fs]
[<f89e9f56>] f2fs_ioctl+0x6b6/0x10b0 [f2fs]
[<c13d51df>] ? __this_cpu_preempt_check+0xf/0x20
[<c10b4281>] ? trace_hardirqs_off_caller+0x91/0x120
[<f89e98a0>] ? __exchange_data_block+0xd30/0xd30 [f2fs]
[<c120b2e1>] do_vfs_ioctl+0x81/0x7f0
[<c11d57c5>] ? kmem_cache_free+0x245/0x2e0
[<c1217840>] ? get_unused_fd_flags+0x40/0x40
[<c1206eec>] ? putname+0x4c/0x50
[<c11f631e>] ? do_sys_open+0x16e/0x1d0
[<c1001990>] ? do_fast_syscall_32+0x30/0x1c0
[<c13d51df>] ? __this_cpu_preempt_check+0xf/0x20
[<c120baa8>] SyS_ioctl+0x58/0x80
[<c1001a01>] do_fast_syscall_32+0xa1/0x1c0
[<c178cc54>] sysenter_past_esp+0x45/0x74
EIP: [<f89fcefe>] write_checkpoint+0xfde/0x1020 [f2fs] SS:ESP 0068:e7263d18
---[ end trace 4de95d7e6b3aa7c6 ]---

The reason is: with below call stack, we will encounter BUG_ON during
doing fstrim.

Thread A Thread B
- write_checkpoint
- do_checkpoint
- f2fs_write_inode
- update_inode_page
- update_inode
- set_page_dirty
- f2fs_set_node_page_dirty
- inc_page_count
- percpu_counter_inc
- set_sbi_flag(SBI_IS_DIRTY)
- clear_sbi_flag(SBI_IS_DIRTY)

Thread C Thread D
- f2fs_write_node_page
- set_node_addr
- __set_nat_cache_dirty
- nm_i->dirty_nat_cnt++
- do_vfs_ioctl
- f2fs_ioctl
- f2fs_trim_fs
- write_checkpoint
- f2fs_bug_on(nm_i->dirty_nat_cnt)

Fix it by setting superblock dirty correctly in do_checkpoint and
f2fs_write_node_page.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/checkpoint.c | 8 ++++++++
fs/f2fs/node.c | 1 +
2 files changed, 9 insertions(+)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index cd0443d..1864078 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1153,6 +1153,14 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
clear_prefree_segments(sbi, cpc);
clear_sbi_flag(sbi, SBI_IS_DIRTY);

+ /*
+ * redirty superblock if metadata like node page or inode cache is
+ * updated during writting checkpoint.
+ */
+ if (get_pages(sbi, F2FS_DIRTY_NODES) ||
+ get_pages(sbi, F2FS_DIRTY_IMETA))
+ set_sbi_flag(sbi, SBI_IS_DIRTY);
+
return 0;
}

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 8a28800..365c6ff 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1597,6 +1597,7 @@ static int f2fs_write_node_page(struct page *page,
fio.old_blkaddr = ni.blk_addr;
write_node_page(nid, &fio);
set_node_addr(sbi, &ni, fio.new_blkaddr, is_fsync_dnode(page));
+ set_sbi_flag(sbi, SBI_IS_DIRTY);
dec_page_count(sbi, F2FS_DIRTY_NODES);
up_read(&sbi->node_write);

--
2.7.2
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