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| author | Chao Yu <chao@kernel.org> | 2022-07-06 09:30:15 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2022-07-31 06:16:20 +0300 |
| commit | 67ca06872eb02944b4c6f92cffa9242e92c63109 (patch) | |
| tree | 1480df337ba642e4cffcbbcbddf3f9d429c9bae8 /fs/f2fs/data.c | |
| parent | 8e0f54a70e9b0c88d6375933d281d631b7248153 (diff) | |
| download | linux-67ca06872eb02944b4c6f92cffa9242e92c63109.tar.xz | |
f2fs: fix to invalidate META_MAPPING before DIO write
Quoted from commit e3b49ea36802 ("f2fs: invalidate META_MAPPING before
IPU/DIO write")
"
Encrypted pages during GC are read and cached in META_MAPPING.
However, due to cached pages in META_MAPPING, there is an issue where
newly written pages are lost by IPU or DIO writes.
Thread A - f2fs_gc() Thread B
/* phase 3 */
down_write(i_gc_rwsem)
ra_data_block() ---- (a)
up_write(i_gc_rwsem)
f2fs_direct_IO() :
- down_read(i_gc_rwsem)
- __blockdev_direct_io()
- get_data_block_dio_write()
- f2fs_dio_submit_bio() ---- (b)
- up_read(i_gc_rwsem)
/* phase 4 */
down_write(i_gc_rwsem)
move_data_block() ---- (c)
up_write(i_gc_rwsem)
(a) In phase 3 of f2fs_gc(), up-to-date page is read from storage and
cached in META_MAPPING.
(b) In thread B, writing new data by IPU or DIO write on same blkaddr as
read in (a). cached page in META_MAPPING become out-dated.
(c) In phase 4 of f2fs_gc(), out-dated page in META_MAPPING is copied to
new blkaddr. In conclusion, the newly written data in (b) is lost.
To address this issue, invalidating pages in META_MAPPING before IPU or
DIO write.
"
In previous commit, we missed to cover extent cache hit case, and passed
wrong value for parameter @end of invalidate_mapping_pages(), fix both
issues.
Fixes: 6aa58d8ad20a ("f2fs: readahead encrypted block during GC")
Fixes: e3b49ea36802 ("f2fs: invalidate META_MAPPING before IPU/DIO write")
Cc: Hyeong-Jun Kim <hj514.kim@samsung.com>
Signed-off-by: Chao Yu <chao.yu@oppo.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/data.c')
| -rw-r--r-- | fs/f2fs/data.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 7fcbcf979737..f2a272613477 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1463,9 +1463,12 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, *map->m_next_extent = pgofs + map->m_len; /* for hardware encryption, but to avoid potential issue in future */ - if (flag == F2FS_GET_BLOCK_DIO) + if (flag == F2FS_GET_BLOCK_DIO) { f2fs_wait_on_block_writeback_range(inode, map->m_pblk, map->m_len); + invalidate_mapping_pages(META_MAPPING(sbi), + map->m_pblk, map->m_pblk + map->m_len - 1); + } if (map->m_multidev_dio) { block_t blk_addr = map->m_pblk; @@ -1682,7 +1685,7 @@ sync_out: f2fs_wait_on_block_writeback_range(inode, map->m_pblk, map->m_len); invalidate_mapping_pages(META_MAPPING(sbi), - map->m_pblk, map->m_pblk); + map->m_pblk, map->m_pblk + map->m_len - 1); if (map->m_multidev_dio) { block_t blk_addr = map->m_pblk; |