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| author | Chao Yu <yuchao0@huawei.com> | 2018-09-27 13:33:18 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-10-01 04:41:22 +0300 |
| commit | 39a8695824510a951ded696d69b8dea3c720b109 (patch) | |
| tree | fa3be21e5cf852b521c4d031b63b29521d4e5f94 /Documentation | |
| parent | bab475c5414e8d1fa182fd17ae966864e9c85741 (diff) | |
| download | linux-39a8695824510a951ded696d69b8dea3c720b109.tar.xz | |
f2fs: refactor ->page_mkwrite() flow
Thread A Thread B
- f2fs_vm_page_mkwrite
- f2fs_setattr
- down_write(i_mmap_sem)
- truncate_setsize
- f2fs_truncate
- up_write(i_mmap_sem)
- f2fs_reserve_block
reserve NEW_ADDR
- skip dirty page due to truncation
1. we don't need to rserve new block address for a truncated page.
2. dn.data_blkaddr is used out of node page lock coverage.
Refactor ->page_mkwrite() flow to fix above issues:
- use __do_map_lock() to avoid racing checkpoint()
- lock data page in prior to dnode page
- cover f2fs_reserve_block with i_mmap_sem lock
- wait page writeback before zeroing page
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions