Commit 899fee36 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim

f2fs: fix to avoid data corruption by forbidding SSR overwrite

There is one case can cause data corruption.

- write 4k to fileA
- fsync fileA, 4k data is writebacked to lbaA
- write 4k to fileA
- kworker flushs 4k to lbaB; dnode contain lbaB didn't be persisted yet
- write 4k to fileB
- kworker flush 4k to lbaA due to SSR
- SPOR -> dnode with lbaA will be recovered, however lbaA contains fileB's
data

One solution is tracking all fsynced file's block history, and disallow
SSR overwrite on newly invalidated block on that file.

However, during recovery, no matter the dnode is flushed or fsynced, all
previous dnodes until last fsynced one in node chain can be recovered,
that means we need to record all block change in flushed dnode, which
will cause heavy cost, so let's just use simple fix by forbidding SSR
overwrite directly.

Fixes: 5b6c6be2 ("f2fs: use SSR for warm node as well")
Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent aabc172b
...@@ -2163,9 +2163,11 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del) ...@@ -2163,9 +2163,11 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
if (!f2fs_test_and_set_bit(offset, se->discard_map)) if (!f2fs_test_and_set_bit(offset, se->discard_map))
sbi->discard_blks--; sbi->discard_blks--;
/* don't overwrite by SSR to keep node chain */ /*
if (IS_NODESEG(se->type) && * SSR should never reuse block which is checkpointed
!is_sbi_flag_set(sbi, SBI_CP_DISABLED)) { * or newly invalidated.
*/
if (!is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
if (!f2fs_test_and_set_bit(offset, se->ckpt_valid_map)) if (!f2fs_test_and_set_bit(offset, se->ckpt_valid_map))
se->ckpt_valid_blocks++; se->ckpt_valid_blocks++;
} }
......
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