This is a note to let you know that I've just added the patch titled
f2fs: invalidate META_MAPPING before IPU/DIO write
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
f2fs-invalidate-meta_mapping-before-ipu-dio-write.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e3b49ea36802053f312013fd4ccb6e59920a9f76 Mon Sep 17 00:00:00 2001
From: Hyeong-Jun Kim <hj514.kim@xxxxxxxxxxx>
Date: Tue, 2 Nov 2021 16:10:02 +0900
Subject: f2fs: invalidate META_MAPPING before IPU/DIO write
From: Hyeong-Jun Kim <hj514.kim@xxxxxxxxxxx>
commit e3b49ea36802053f312013fd4ccb6e59920a9f76 upstream.
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@xxxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>a
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: lvgaofei <lvgaofei@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/f2fs/data.c | 2 ++
fs/f2fs/segment.c | 3 +++
2 files changed, 5 insertions(+)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1677,6 +1677,8 @@ sync_out:
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) {
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3614,6 +3614,9 @@ int f2fs_inplace_write_data(struct f2fs_
goto drop_bio;
}
+ 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)))
Patches currently in stable-queue which might be from hj514.kim@xxxxxxxxxxx are
queue-5.15/f2fs-invalidate-meta_mapping-before-ipu-dio-write.patch
