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[Qemu-devel] [PATCH 0/7] qcow2 check improvements
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH 0/7] qcow2 check improvements |
Date: |
Tue, 19 Jun 2018 21:34:50 +0300 |
Hi all!
We've faced the following problem: after host fs corruption, vm images
becomes invalid. And which is interesting, starting qemu-img check on
them led to allocating of the whole RAM and then killing qemu-img by
OOM Killer.
This was due to corrupted l2 entries, which referenced clusters far-far
beyond the end of the qcow2 file.
02 is a generic fix for the bug, 01 is unrelated improvement, 03-07 are
additional info and fixing for such corrupted table entries.
Questions on 02, 06 and 07:
1. Should restrictions be more or less strict?
2. Are there valid cases, when such entries should not be considered as
corrupted?
Vladimir Sementsov-Ogievskiy (7):
block/qcow2-refcount: fix check_oflag_copied
block/qcow2-refcount: avoid eating RAM
block/qcow2-refcount: check_refcounts_l2: refactor compressed case
block/qcow2-refcount: check_refcounts_l2: reduce ignored overlaps
block/qcow2-refcount: check_refcounts_l2: split fix_l2_entry_to_zero
block/qcow2-refcount: fix out-of-file L1 entries to be zero
block/qcow2-refcount: fix out-of-file L2 entries to be read-as-zero
block/qcow2-refcount.c | 257 +++++++++++++++++++++++++++++++++++++++----------
1 file changed, 206 insertions(+), 51 deletions(-)
--
2.11.1
- [Qemu-devel] [PATCH 0/7] qcow2 check improvements,
Vladimir Sementsov-Ogievskiy <=
- [Qemu-devel] [PATCH 2/7] block/qcow2-refcount: avoid eating RAM, Vladimir Sementsov-Ogievskiy, 2018/06/19
- [Qemu-devel] [PATCH 4/7] block/qcow2-refcount: check_refcounts_l2: reduce ignored overlaps, Vladimir Sementsov-Ogievskiy, 2018/06/19
- [Qemu-devel] [PATCH 3/7] block/qcow2-refcount: check_refcounts_l2: refactor compressed case, Vladimir Sementsov-Ogievskiy, 2018/06/19
- [Qemu-devel] [PATCH 6/7] block/qcow2-refcount: fix out-of-file L1 entries to be zero, Vladimir Sementsov-Ogievskiy, 2018/06/19
- [Qemu-devel] [PATCH 5/7] block/qcow2-refcount: check_refcounts_l2: split fix_l2_entry_to_zero, Vladimir Sementsov-Ogievskiy, 2018/06/19