[0/1] ext4: Fix stale data exposure caused with dioread_nolock

Message

Ojaswin Mujoo Sept. 5, 2023, 10:28 a.m. UTC

The detailed report on the issues faced and the root cause can be found
in the commit message. I've intentionally added all the details to
commit message so that it can be tracked in the future, let me know if
its too long and I can try stripping some info.

For this particular fix, I've tested these patches with xfstests -g
quick with:

- 64k block size, 64k pagesize 
- 4k blocksize 64k pagesize
- both with and without nodelalloc 

and I don't see any regressions. I'll plan to run more tests on this and
report back if I notice anything. Suggestions or ideas are welcome.

Regards,
ojaswin

Ojaswin Mujoo (1):
  ext4: Mark buffer new if it is unwritten to avoid stale data exposure

 fs/ext4/inode.c | 4 ++++
 1 file changed, 4 insertions(+)