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Re: [PATCH v8 2/8] block: consolidate blocksize properties consistency c
From: |
Roman Kagan |
Subject: |
Re: [PATCH v8 2/8] block: consolidate blocksize properties consistency checks |
Date: |
Fri, 29 May 2020 13:56:36 +0300 |
On Fri, May 29, 2020 at 11:53:26AM +0200, Markus Armbruster wrote:
> Roman Kagan <rvkagan@yandex-team.ru> writes:
>
> > Several block device properties related to blocksize configuration must
> > be in certain relationship WRT each other: physical block must be no
> > smaller than logical block; min_io_size, opt_io_size, and
> > discard_granularity must be a multiple of a logical block.
> >
> > To ensure these requirements are met, add corresponding consistency
> > checks to blkconf_blocksizes, adjusting its signature to communicate
> > possible error to the caller. Also remove the now redundant consistency
> > checks from the specific devices.
> >
> > Signed-off-by: Roman Kagan <rvkagan@yandex-team.ru>
> > Reviewed-by: Eric Blake <eblake@redhat.com>
> > Reviewed-by: Paul Durrant <paul@xen.org>
> > ---
> > include/hw/block/block.h | 2 +-
> > hw/block/block.c | 30 +++++++++++++++++++++++++++++-
> > hw/block/fdc.c | 5 ++++-
> > hw/block/nvme.c | 5 ++++-
> > hw/block/swim.c | 5 ++++-
> > hw/block/virtio-blk.c | 7 +------
> > hw/block/xen-block.c | 6 +-----
> > hw/ide/qdev.c | 5 ++++-
> > hw/scsi/scsi-disk.c | 12 +++++-------
> > hw/usb/dev-storage.c | 5 ++++-
> > tests/qemu-iotests/172.out | 2 +-
> > 11 files changed, 58 insertions(+), 26 deletions(-)
> >
> > diff --git a/include/hw/block/block.h b/include/hw/block/block.h
> > index d7246f3862..784953a237 100644
> > --- a/include/hw/block/block.h
> > +++ b/include/hw/block/block.h
> > @@ -87,7 +87,7 @@ bool blk_check_size_and_read_all(BlockBackend *blk, void
> > *buf, hwaddr size,
> > bool blkconf_geometry(BlockConf *conf, int *trans,
> > unsigned cyls_max, unsigned heads_max, unsigned
> > secs_max,
> > Error **errp);
> > -void blkconf_blocksizes(BlockConf *conf);
> > +bool blkconf_blocksizes(BlockConf *conf, Error **errp);
> > bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
> > bool resizable, Error **errp);
> >
> > diff --git a/hw/block/block.c b/hw/block/block.c
> > index bf56c7612b..b22207c921 100644
> > --- a/hw/block/block.c
> > +++ b/hw/block/block.c
> > @@ -61,7 +61,7 @@ bool blk_check_size_and_read_all(BlockBackend *blk, void
> > *buf, hwaddr size,
> > return true;
> > }
> >
> > -void blkconf_blocksizes(BlockConf *conf)
> > +bool blkconf_blocksizes(BlockConf *conf, Error **errp)
> > {
> > BlockBackend *blk = conf->blk;
> > BlockSizes blocksizes;
> > @@ -83,6 +83,34 @@ void blkconf_blocksizes(BlockConf *conf)
> > conf->logical_block_size = BDRV_SECTOR_SIZE;
> > }
> > }
> > +
> > + if (conf->logical_block_size > conf->physical_block_size) {
> > + error_setg(errp,
> > + "logical_block_size > physical_block_size not
> > supported");
> > + return false;
> > + }
>
> Pardon me if this has been answered already for prior revisions: do we
> really support physical block sizes that are not a multiple of the
> logical block size?
Both physical and logical block sizes are required to be powers of two,
so the former is certain to be a multiple of the latter.
> > +
> > + if (!QEMU_IS_ALIGNED(conf->min_io_size, conf->logical_block_size)) {
> > + error_setg(errp,
> > + "min_io_size must be a multiple of logical_block_size");
> > + return false;
> > + }
> > +
> > + if (!QEMU_IS_ALIGNED(conf->opt_io_size, conf->logical_block_size)) {
> > + error_setg(errp,
> > + "opt_io_size must be a multiple of logical_block_size");
> > + return false;
> > + }
> > +
> > + if (conf->discard_granularity != -1 &&
> > + !QEMU_IS_ALIGNED(conf->discard_granularity,
> > + conf->logical_block_size)) {
> > + error_setg(errp, "discard_granularity must be "
> > + "a multiple of logical_block_size");
> > + return false;
> > + }
> > +
> > + return true;
> > }
> >
> > bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
> > diff --git a/hw/block/fdc.c b/hw/block/fdc.c
> > index c5fb9d6ece..8eda572ef4 100644
> > --- a/hw/block/fdc.c
> > +++ b/hw/block/fdc.c
> > @@ -554,7 +554,10 @@ static void floppy_drive_realize(DeviceState *qdev,
> > Error **errp)
> > read_only = !blk_bs(dev->conf.blk) ||
> > blk_is_read_only(dev->conf.blk);
> > }
> >
> > - blkconf_blocksizes(&dev->conf);
> > + if (!blkconf_blocksizes(&dev->conf, errp)) {
> > + return;
> > + }
> > +
> > if (dev->conf.logical_block_size != 512 ||
> > dev->conf.physical_block_size != 512)
> > {
> > diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> > index 2f3100e56c..672650e162 100644
> > --- a/hw/block/nvme.c
> > +++ b/hw/block/nvme.c
> > @@ -1390,7 +1390,10 @@ static void nvme_realize(PCIDevice *pci_dev, Error
> > **errp)
> > host_memory_backend_set_mapped(n->pmrdev, true);
> > }
> >
> > - blkconf_blocksizes(&n->conf);
> > + if (!blkconf_blocksizes(&n->conf, errp)) {
> > + return;
> > + }
> > +
> > if (!blkconf_apply_backend_options(&n->conf,
> > blk_is_read_only(n->conf.blk),
> > false, errp)) {
> > return;
> > diff --git a/hw/block/swim.c b/hw/block/swim.c
> > index 8f124782f4..74f56e8f46 100644
> > --- a/hw/block/swim.c
> > +++ b/hw/block/swim.c
> > @@ -189,7 +189,10 @@ static void swim_drive_realize(DeviceState *qdev,
> > Error **errp)
> > assert(ret == 0);
> > }
> >
> > - blkconf_blocksizes(&dev->conf);
> > + if (!blkconf_blocksizes(&dev->conf, errp)) {
> > + return;
> > + }
> > +
> > if (dev->conf.logical_block_size != 512 ||
> > dev->conf.physical_block_size != 512)
> > {
> > diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> > index 413083e62f..4ffdb130be 100644
> > --- a/hw/block/virtio-blk.c
> > +++ b/hw/block/virtio-blk.c
> > @@ -1162,12 +1162,7 @@ static void virtio_blk_device_realize(DeviceState
> > *dev, Error **errp)
> > return;
> > }
> >
> > - blkconf_blocksizes(&conf->conf);
> > -
> > - if (conf->conf.logical_block_size >
> > - conf->conf.physical_block_size) {
> > - error_setg(errp,
> > - "logical_block_size > physical_block_size not
> > supported");
> > + if (!blkconf_blocksizes(&conf->conf, errp)) {
> > return;
> > }
> >
> > diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c
> > index 570489d6d9..e17fec50e1 100644
> > --- a/hw/block/xen-block.c
> > +++ b/hw/block/xen-block.c
> > @@ -239,11 +239,7 @@ static void xen_block_realize(XenDevice *xendev, Error
> > **errp)
> > return;
> > }
> >
> > - blkconf_blocksizes(conf);
> > -
> > - if (conf->logical_block_size > conf->physical_block_size) {
> > - error_setg(
> > - errp, "logical_block_size > physical_block_size not
> > supported");
> > + if (!blkconf_blocksizes(conf, errp)) {
> > return;
> > }
> >
> > diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
> > index 06b11583f5..b4821b2403 100644
> > --- a/hw/ide/qdev.c
> > +++ b/hw/ide/qdev.c
> > @@ -187,7 +187,10 @@ static void ide_dev_initfn(IDEDevice *dev,
> > IDEDriveKind kind, Error **errp)
> > return;
> > }
> >
> > - blkconf_blocksizes(&dev->conf);
> > + if (!blkconf_blocksizes(&dev->conf, errp)) {
> > + return;
> > + }
> > +
> > if (dev->conf.logical_block_size != 512) {
> > error_setg(errp, "logical_block_size must be 512 for IDE");
> > return;
> > diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> > index 387503e11b..8ce68a9dd6 100644
> > --- a/hw/scsi/scsi-disk.c
> > +++ b/hw/scsi/scsi-disk.c
> > @@ -2346,12 +2346,7 @@ static void scsi_realize(SCSIDevice *dev, Error
> > **errp)
> > return;
> > }
> >
> > - blkconf_blocksizes(&s->qdev.conf);
> > -
> > - if (s->qdev.conf.logical_block_size >
> > - s->qdev.conf.physical_block_size) {
> > - error_setg(errp,
> > - "logical_block_size > physical_block_size not
> > supported");
> > + if (!blkconf_blocksizes(&s->qdev.conf, errp)) {
> > return;
> > }
> >
> > @@ -2436,7 +2431,9 @@ static void scsi_hd_realize(SCSIDevice *dev, Error
> > **errp)
> > if (s->qdev.conf.blk) {
> > ctx = blk_get_aio_context(s->qdev.conf.blk);
> > aio_context_acquire(ctx);
> > - blkconf_blocksizes(&s->qdev.conf);
> > + if (!blkconf_blocksizes(&s->qdev.conf, errp)) {
> > + goto out;
> > + }
> > }
> > s->qdev.blocksize = s->qdev.conf.logical_block_size;
> > s->qdev.type = TYPE_DISK;
> > @@ -2444,6 +2441,7 @@ static void scsi_hd_realize(SCSIDevice *dev, Error
> > **errp)
> > s->product = g_strdup("QEMU HARDDISK");
> > }
> > scsi_realize(&s->qdev, errp);
> > +out:
> > if (ctx) {
> > aio_context_release(ctx);
> > }
> > diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
> > index 4eba47538d..de461f37bd 100644
> > --- a/hw/usb/dev-storage.c
> > +++ b/hw/usb/dev-storage.c
> > @@ -599,7 +599,10 @@ static void usb_msd_storage_realize(USBDevice *dev,
> > Error **errp)
> > return;
> > }
> >
> > - blkconf_blocksizes(&s->conf);
> > + if (!blkconf_blocksizes(&s->conf, errp)) {
> > + return;
> > + }
> > +
> > if (!blkconf_apply_backend_options(&s->conf, blk_is_read_only(blk),
> > true,
> > errp)) {
> > return;
> > diff --git a/tests/qemu-iotests/172.out b/tests/qemu-iotests/172.out
> > index 7abbe82427..59cc70aebb 100644
> > --- a/tests/qemu-iotests/172.out
> > +++ b/tests/qemu-iotests/172.out
> > @@ -1204,7 +1204,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device
> > floppy,drive=none0,physica
> > drive-type = "144"
> >
> > Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device
> > floppy,drive=none0,logical_block_size=4096
> > -QEMU_PROG: -device floppy,drive=none0,logical_block_size=4096: Physical
> > and logical block size must be 512 for floppy
> > +QEMU_PROG: -device floppy,drive=none0,logical_block_size=4096:
> > logical_block_size > physical_block_size not supported
> >
> > Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device
> > floppy,drive=none0,physical_block_size=1024
> > QEMU_PROG: -device floppy,drive=none0,physical_block_size=1024: Physical
> > and logical block size must be 512 for floppy
>
> This no longer exercises floppy_drive_realize()'s check of
> logical_block_size:
>
> if (dev->conf.logical_block_size != 512 ||
> dev->conf.physical_block_size != 512)
Right, this check of logical_block_size here becomes redundant now,
because eariler it's verified to be no less than 512 and no more than
physical_block_size, which is required to be 512 here. I thought it
made no harm to leave it here as it was, and decided not to bother
replacing it with a comment as to why the condition is known to be true.
> {
> error_setg(errp, "Physical and logical block size must "
> "be 512 for floppy");
> return;
> }
>
> Please update the test.
The test still makes sense, it just triggers another assertion now. How
do you suggest to update it?
Thanks,
Roman.
- [PATCH v8 0/8] block: enhance handling of size-related BlockConf properties, Roman Kagan, 2020/05/28
- [PATCH v8 1/8] virtio-blk: store opt_io_size with correct size, Roman Kagan, 2020/05/28
- [PATCH v8 2/8] block: consolidate blocksize properties consistency checks, Roman Kagan, 2020/05/28
- [PATCH v8 3/8] qdev-properties: blocksize: use same limits in code and description, Roman Kagan, 2020/05/28
- [PATCH v8 4/8] qdev-properties: add size32 property type, Roman Kagan, 2020/05/28
- [PATCH v8 5/8] qdev-properties: make blocksize accept size suffixes, Roman Kagan, 2020/05/28
- [PATCH v8 6/8] block: make BlockConf size props 32bit and accept size suffixes, Roman Kagan, 2020/05/28
- [PATCH v8 7/8] qdev-properties: add getter for size32 and blocksize, Roman Kagan, 2020/05/28
- [PATCH v8 8/8] block: lift blocksize property limit to 2 MiB, Roman Kagan, 2020/05/28