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Re: [Qemu-block] [Qemu-devel] [PATCH 0/5] ide: avoid main-loop hang on C
From: |
John Snow |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH 0/5] ide: avoid main-loop hang on CDROM/NFS failure |
Date: |
Mon, 21 Sep 2015 16:58:20 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
On 09/21/2015 08:25 AM, Peter Lieven wrote:
> This series aims at avoiding a hanging main-loop if a vserver has a
> CDROM image mounted from a NFS share and that NFS share goes down.
> Typical situation is that users mount an CDROM ISO to install something
> and then forget to eject that CDROM afterwards.
> As a consequence this mounted CD is able to bring down the
> whole vserver if the backend NFS share is unreachable. This is bad
> especially if the CDROM itself is not needed anymore at this point.
>
> This series aims at fixing 3 blocking I/O operations that would
> hang if the NFS server is unavailable:
> - ATAPI PIO read requests used sync calls to blk_read, convert
> them to an async variant.
> - If a busmaster DMA request is cancelled all requests are drained.
> Convert the drain to an async request canceling.
> - query-block in the HMP or QMP hangs because it indirectly calls
> bdrv_get_allocated_file_size.
>
> Note that Patch 5 is only included for completeness.
>
> Peter
>
> Peter Lieven (5):
> ide/atapi: make PIO read requests async
> ide/atapi: blk_aio_readv may return NULL
> ide: add support for cancelable read requests
> ide/atapi: enable cancelable requests
> block/nfs: cache allocated filesize for read-only files
>
> block/nfs.c | 36 ++++++++++++++++++++++++++
> hw/ide/atapi.c | 75
> +++++++++++++++++++++++++++++++++++--------------------
> hw/ide/core.c | 55 ++++++++++++++++++++++++++++++++++++++++
> hw/ide/internal.h | 16 ++++++++++++
> hw/ide/pci.c | 42 ++++++++++++++++++++-----------
> 5 files changed, 183 insertions(+), 41 deletions(-)
>
I assume this supersedes both:
[Qemu-devel] [PATCH 0/2] ide/atapi: partially avoid deadlock if the
storage backend is dead
and
[Qemu-devel] [PATCH] ide/atapi: make PIO read requests async
right?
--js
- [Qemu-block] [PATCH 0/5] ide: avoid main-loop hang on CDROM/NFS failure, Peter Lieven, 2015/09/21
- [Qemu-block] [PATCH 2/5] ide/atapi: blk_aio_readv may return NULL, Peter Lieven, 2015/09/21
- [Qemu-block] [PATCH 1/5] ide/atapi: make PIO read requests async, Peter Lieven, 2015/09/21
- [Qemu-block] [PATCH 4/5] ide/atapi: enable cancelable requests, Peter Lieven, 2015/09/21
- [Qemu-block] [PATCH 3/5] ide: add support for cancelable read requests, Peter Lieven, 2015/09/21
- [Qemu-block] [PATCH 5/5] block/nfs: cache allocated filesize for read-only files, Peter Lieven, 2015/09/21
- Re: [Qemu-block] [Qemu-devel] [PATCH 0/5] ide: avoid main-loop hang on CDROM/NFS failure,
John Snow <=