| Message ID | 20231217165359.604246-3-hch@lst.de (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [1/5] virtio_blk: cleanup zoned device probing | expand |
On 2023/12/18 1:53, Christoph Hellwig wrote: > virtblk_revalidate_zones is called unconditionally from > virtblk_config_changed_work from the virtio config_changed callback. > > virtblk_revalidate_zones is a bit odd in that it re-clears the zoned > state for host aware or non-zoned devices, which isn't needed unless the > zoned mode changed - but a zone mode change to a host managed model isn't > handled at all, and virtio_blk also doesn't handle any other config > change except for a capacity change is handled (and even if it was > the upper layers above virtio_blk wouldn't handle it very well). > > But even the useful case of a size change that would add or remove > zones isn't handled properly as blk_revalidate_disk_zones expects the > device capacity to cover all zones, but the capacity is only updated > after virtblk_revalidate_zones. > > As this code appears to be entirely untested and is getting in the way > remove it for now, but it can be readded in a fixed version with > proper test coverage if needed. > > Fixes: 95bfec41bd3d ("virtio-blk: add support for zoned block devices") > Fixes: f1ba4e674feb ("virtio-blk: fix to match virtio spec") > Signed-off-by: Christoph Hellwig <hch@lst.de> Not ideal... But I think this is OK for now given that as you say, the upper layer will not be able to handle zone changes anyway. Reviewed-by: Damien Le Moal <dlemoal@kernel.org> > --- > drivers/block/virtio_blk.c | 26 -------------------------- > 1 file changed, 26 deletions(-) > > diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c > index aeead732a24dc9..a28f1687066bb4 100644 > --- a/drivers/block/virtio_blk.c > +++ b/drivers/block/virtio_blk.c > @@ -722,27 +722,6 @@ static int virtblk_report_zones(struct gendisk *disk, sector_t sector, > return ret; > } > > -static void virtblk_revalidate_zones(struct virtio_blk *vblk) > -{ > - u8 model; > - > - virtio_cread(vblk->vdev, struct virtio_blk_config, > - zoned.model, &model); > - switch (model) { > - default: > - dev_err(&vblk->vdev->dev, "unknown zone model %d\n", model); > - fallthrough; > - case VIRTIO_BLK_Z_NONE: > - case VIRTIO_BLK_Z_HA: > - disk_set_zoned(vblk->disk, BLK_ZONED_NONE); > - return; > - case VIRTIO_BLK_Z_HM: > - WARN_ON_ONCE(!vblk->zone_sectors); > - if (!blk_revalidate_disk_zones(vblk->disk, NULL)) > - set_capacity_and_notify(vblk->disk, 0); > - } > -} > - > static int virtblk_probe_zoned_device(struct virtio_device *vdev, > struct virtio_blk *vblk, > struct request_queue *q) > @@ -823,10 +802,6 @@ static int virtblk_probe_zoned_device(struct virtio_device *vdev, > */ > #define virtblk_report_zones NULL > > -static inline void virtblk_revalidate_zones(struct virtio_blk *vblk) > -{ > -} > - > static inline int virtblk_probe_zoned_device(struct virtio_device *vdev, > struct virtio_blk *vblk, struct request_queue *q) > { > @@ -982,7 +957,6 @@ static void virtblk_config_changed_work(struct work_struct *work) > struct virtio_blk *vblk = > container_of(work, struct virtio_blk, config_work); > > - virtblk_revalidate_zones(vblk); > virtblk_update_capacity(vblk, true); > } >
On Sun, Dec 17, 2023 at 05:53:56PM +0100, Christoph Hellwig wrote: > virtblk_revalidate_zones is called unconditionally from > virtblk_config_changed_work from the virtio config_changed callback. > > virtblk_revalidate_zones is a bit odd in that it re-clears the zoned > state for host aware or non-zoned devices, which isn't needed unless the > zoned mode changed - but a zone mode change to a host managed model isn't > handled at all, and virtio_blk also doesn't handle any other config > change except for a capacity change is handled (and even if it was > the upper layers above virtio_blk wouldn't handle it very well). > > But even the useful case of a size change that would add or remove > zones isn't handled properly as blk_revalidate_disk_zones expects the > device capacity to cover all zones, but the capacity is only updated > after virtblk_revalidate_zones. > > As this code appears to be entirely untested and is getting in the way > remove it for now, but it can be readded in a fixed version with > proper test coverage if needed. > > Fixes: 95bfec41bd3d ("virtio-blk: add support for zoned block devices") > Fixes: f1ba4e674feb ("virtio-blk: fix to match virtio spec") > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > drivers/block/virtio_blk.c | 26 -------------------------- > 1 file changed, 26 deletions(-) Fair enough. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index aeead732a24dc9..a28f1687066bb4 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -722,27 +722,6 @@ static int virtblk_report_zones(struct gendisk *disk, sector_t sector, return ret; } -static void virtblk_revalidate_zones(struct virtio_blk *vblk) -{ - u8 model; - - virtio_cread(vblk->vdev, struct virtio_blk_config, - zoned.model, &model); - switch (model) { - default: - dev_err(&vblk->vdev->dev, "unknown zone model %d\n", model); - fallthrough; - case VIRTIO_BLK_Z_NONE: - case VIRTIO_BLK_Z_HA: - disk_set_zoned(vblk->disk, BLK_ZONED_NONE); - return; - case VIRTIO_BLK_Z_HM: - WARN_ON_ONCE(!vblk->zone_sectors); - if (!blk_revalidate_disk_zones(vblk->disk, NULL)) - set_capacity_and_notify(vblk->disk, 0); - } -} - static int virtblk_probe_zoned_device(struct virtio_device *vdev, struct virtio_blk *vblk, struct request_queue *q) @@ -823,10 +802,6 @@ static int virtblk_probe_zoned_device(struct virtio_device *vdev, */ #define virtblk_report_zones NULL -static inline void virtblk_revalidate_zones(struct virtio_blk *vblk) -{ -} - static inline int virtblk_probe_zoned_device(struct virtio_device *vdev, struct virtio_blk *vblk, struct request_queue *q) { @@ -982,7 +957,6 @@ static void virtblk_config_changed_work(struct work_struct *work) struct virtio_blk *vblk = container_of(work, struct virtio_blk, config_work); - virtblk_revalidate_zones(vblk); virtblk_update_capacity(vblk, true); }
virtblk_revalidate_zones is called unconditionally from virtblk_config_changed_work from the virtio config_changed callback. virtblk_revalidate_zones is a bit odd in that it re-clears the zoned state for host aware or non-zoned devices, which isn't needed unless the zoned mode changed - but a zone mode change to a host managed model isn't handled at all, and virtio_blk also doesn't handle any other config change except for a capacity change is handled (and even if it was the upper layers above virtio_blk wouldn't handle it very well). But even the useful case of a size change that would add or remove zones isn't handled properly as blk_revalidate_disk_zones expects the device capacity to cover all zones, but the capacity is only updated after virtblk_revalidate_zones. As this code appears to be entirely untested and is getting in the way remove it for now, but it can be readded in a fixed version with proper test coverage if needed. Fixes: 95bfec41bd3d ("virtio-blk: add support for zoned block devices") Fixes: f1ba4e674feb ("virtio-blk: fix to match virtio spec") Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/block/virtio_blk.c | 26 -------------------------- 1 file changed, 26 deletions(-)