BACKPORT: 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 hj514.kim@samsung.com Reviewed-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: lvgaofei lvgaofei@oppo.com (cherry picked from commit e3b49ea36802053f312013fd4ccb6e59920a9f76) --- fs/f2fs/data.c | 5 ++++- fs/f2fs/segment.c | 3 +++ 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index b2016fd..994a09e 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1713,9 +1713,12 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, sync_out:

/* for hardware encryption, but to avoid potential issue in future */ - if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED) + if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED) { 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 (flag == F2FS_GET_BLOCK_PRECACHE) { if (map->m_flags & F2FS_MAP_MAPPED) { diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 19224e7..8549332 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -3547,6 +3547,9 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio) return -EFSCORRUPTED; }

+ invalidate_mapping_pages(META_MAPPING(sbi), + fio->new_blkaddr, fio->new_blkaddr); + stat_inc_inplace_blocks(fio->sbi);

if (fio->bio && !(SM_I(sbi)->ipu_policy & (1 << F2FS_IPU_NOCACHE))) -- 2.7.4

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