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| author | Chao Yu <yuchao0@huawei.com> | 2016-05-11 19:48:44 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-05-11 09:56:38 -0700 |
| commit | ab47036d8f7227361cad7894adee8e66ab6f95b2 (patch) | |
| tree | b30969adb6466b44cfb1ad443b08e895a3e7a84c /fs/f2fs/data.c | |
| parent | 3b9b10f9ce61b574c63d71ff3eeec9cf5dbe763f (diff) | |
| download | lwn-ab47036d8f7227361cad7894adee8e66ab6f95b2.tar.gz lwn-ab47036d8f7227361cad7894adee8e66ab6f95b2.zip | |
f2fs: fix deadlock when flush inline data
Below backtrace info was reported by Yunlei He:
Call Trace:
[<ffffffff817a9395>] schedule+0x35/0x80
[<ffffffff817abb7d>] rwsem_down_read_failed+0xed/0x130
[<ffffffff813c12a8>] call_rwsem_down_read_failed+0x18/0x
[<ffffffff817ab1d0>] down_read+0x20/0x30
[<ffffffffa02a1a12>] f2fs_evict_inode+0x242/0x3a0 [f2fs]
[<ffffffff81217057>] evict+0xc7/0x1a0
[<ffffffff81217cd6>] iput+0x196/0x200
[<ffffffff812134f9>] __dentry_kill+0x179/0x1e0
[<ffffffff812136f9>] dput+0x199/0x1f0
[<ffffffff811fe77b>] __fput+0x18b/0x220
[<ffffffff811fe84e>] ____fput+0xe/0x10
[<ffffffff81097427>] task_work_run+0x77/0x90
[<ffffffff81074d62>] exit_to_usermode_loop+0x73/0xa2
[<ffffffff81003b7a>] do_syscall_64+0xfa/0x110
[<ffffffff817acf65>] entry_SYSCALL64_slow_path+0x25/0x25
Call Trace:
[<ffffffff817a9395>] schedule+0x35/0x80
[<ffffffff81216dc3>] __wait_on_freeing_inode+0xa3/0xd0
[<ffffffff810bc300>] ? autoremove_wake_function+0x40/0x4
[<ffffffff8121771d>] find_inode_fast+0x7d/0xb0
[<ffffffff8121794a>] ilookup+0x6a/0xd0
[<ffffffffa02bc740>] sync_node_pages+0x210/0x650 [f2fs]
[<ffffffff8122e690>] ? do_fsync+0x70/0x70
[<ffffffffa02b085e>] block_operations+0x9e/0xf0 [f2fs]
[<ffffffff8137b795>] ? bio_endio+0x55/0x60
[<ffffffffa02b0942>] write_checkpoint+0x92/0xba0 [f2fs]
[<ffffffff8117da57>] ? mempool_free_slab+0x17/0x20
[<ffffffff8117de8b>] ? mempool_free+0x2b/0x80
[<ffffffff8122e690>] ? do_fsync+0x70/0x70
[<ffffffffa02a53e3>] f2fs_sync_fs+0x63/0xd0 [f2fs]
[<ffffffff8129630f>] ? ext4_sync_fs+0xbf/0x190
[<ffffffff8122e6b0>] sync_fs_one_sb+0x20/0x30
[<ffffffff812002e9>] iterate_supers+0xb9/0x110
[<ffffffff8122e7b5>] sys_sync+0x55/0x90
[<ffffffff81003ae9>] do_syscall_64+0x69/0x110
[<ffffffff817acf65>] entry_SYSCALL64_slow_path+0x25/0x25
With following excuting serials, we will set inline_node in inode page
after inode was unlinked, result in a deadloop described as below:
1. open file
2. write file
3. unlink file
4. write file
5. close file
Thread A Thread B
- dput
- iput_final
- inode->i_state |= I_FREEING
- evict
- f2fs_evict_inode
- f2fs_sync_fs
- write_checkpoint
- block_operations
- f2fs_lock_all (down_write(cp_rwsem))
- f2fs_lock_op (down_read(cp_rwsem))
- sync_node_pages
- ilookup
- find_inode_fast
- __wait_on_freeing_inode
(wait on I_FREEING clear)
Here, we change to set inline_node flag only for linked inode for fixing.
Reported-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Tested-by: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: stable@vger.kernel.org # v4.6
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/data.c')
| -rw-r--r-- | fs/f2fs/data.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index b61e2d40cdfb..1013836c5b6b 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1546,7 +1546,8 @@ restart: if (pos + len <= MAX_INLINE_DATA) { read_inline_data(page, ipage); set_inode_flag(F2FS_I(inode), FI_DATA_EXIST); - set_inline_node(ipage); + if (inode->i_nlink) + set_inline_node(ipage); } else { err = f2fs_convert_inline_page(&dn, page); if (err) |