Let me drop this, since I missed there was a patch to introdcued this. :)

On 11/06, Jaegeuk Kim wrote:

If background GC is running very frequently by gc_urgent, the next GC can see unwritten data generated by the previous GC, which incurs to write stale corrupted data in disk.

Cc: stable@vger.kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org

---

fs/f2fs/gc.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index a07241fb8537..49fea136a3f3 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -658,6 +658,9 @@ static int ra_data_block(struct inode *inode, pgoff_t index) fio.page = page; fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;

• /* wait writeback before reading out */
• f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
• fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi), dn.data_blkaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);

@@ -755,6 +758,9 @@ static int move_data_block(struct inode *inode, block_t bidx, fio.page = page; fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;

• /* wait writeback before reading out */
• f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
• if (lfs_mode) down_write(&fio.sbi->io_order_lock);

2.19.0.605.g01d371f741-goog