diff options
| author | Chao Yu <yuchao0@huawei.com> | 2017-03-22 14:45:05 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-08 13:05:13 +0100 |
| commit | cb9b1d4ec206702a4df1cb42ba8142f39acfdd91 (patch) | |
| tree | f553d647824d6885cc4d78d47f05139f3d13d219 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 3b19f961d260d1ae12b497e5eb77e5ecc1039fac (diff) | |
f2fs: fix race condition in between free nid allocator/initializer
commit 30a61ddf8117c26ac5b295e1233eaa9629a94ca3 upstream.
In below concurrent case, allocated nid can be loaded into free nid cache
and be allocated again.
Thread A Thread B
- f2fs_create
- f2fs_new_inode
- alloc_nid
- __insert_nid_to_list(ALLOC_NID_LIST)
- f2fs_balance_fs_bg
- build_free_nids
- __build_free_nids
- scan_nat_page
- add_free_nid
- __lookup_nat_cache
- f2fs_add_link
- init_inode_metadata
- new_inode_page
- new_node_page
- set_node_addr
- alloc_nid_done
- __remove_nid_from_list(ALLOC_NID_LIST)
- __insert_nid_to_list(FREE_NID_LIST)
This patch makes nat cache lookup and free nid list operation being atomical
to avoid this race condition.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[bwh: Backported to 4.9:
- add_free_nid() returns 0 in case of any error (except low memory)
- Tree/list addition has not been moved into __insert_nid_to_list()]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions