| From: |
| Christoph Hellwig <hch-AT-lst.de> |
| To: |
| Jens Axboe <axboe-AT-kernel.dk> |
| Subject: |
| make block layer auto-PI deadlock safe |
| Date: |
| Thu, 23 Oct 2025 10:08:53 +0200 |
| Message-ID: |
| <20251023080919.9209-1-hch@lst.de> |
| Cc: |
| Vlastimil Babka <vbabka-AT-suse.cz>, Andrew Morton <akpm-AT-linux-foundation.org>, Christoph Lameter <cl-AT-gentwo.org>, David Rientjes <rientjes-AT-google.com>, Roman Gushchin <roman.gushchin-AT-linux.dev>, Harry Yoo <harry.yoo-AT-oracle.com>, "Martin K. Petersen" <martin.petersen-AT-oracle.com>, linux-block-AT-vger.kernel.org, linux-mm-AT-kvack.org |
| Archive-link: |
| Article |
Hi all,
currently the automatic block layer PI generation allocates the integrity
buffer using kmalloc, and thus could deadlock, or fail I/O request due
to memory pressure.
Fix this by adding a mempool, and capping the maximum I/O size on PI
capable devices to not exceed the allocation size of the mempool.
This is against the block-6.18 branch as it has a contextual dependency
on the PI fix merged there yesterday.
Diffstat:
block/bio-integrity-auto.c | 26 ++---------------------
block/bio-integrity.c | 47 ++++++++++++++++++++++++++++++++++++++++++
block/bio.c | 13 +----------
block/blk-settings.c | 11 +++++++++
include/linux/bio-integrity.h | 6 +++++
include/linux/blk-integrity.h | 5 ++++
include/linux/slab.h | 10 ++++++++
7 files changed, 84 insertions(+), 34 deletions(-)
