From e3b49ea36802053f312013fd4ccb6e59920a9f76 Mon Sep 17 00:00:00 2001 From: Hyeong-Jun Kim Date: Tue, 2 Nov 2021 16:10:02 +0900 Subject: 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. Fixes: 6aa58d8ad20a ("f2fs: readahead encrypted block during GC") Signed-off-by: Hyeong-Jun Kim Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/data.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/f2fs/data.c') diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 74e1a350c1d8..9f754aaef558 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1708,6 +1708,8 @@ 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); if (map->m_multidev_dio) { block_t blk_addr = map->m_pblk; -- cgit v1.2.3