| Message ID | 20220910052759.27517-2-faithilikerun@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for zoned device | expand |
On Sat, Sep 10, 2022 at 01:27:53PM +0800, Sam Li wrote: > Signed-off-by: Sam Li <faithilikerun@gmail.com> > Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> > Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > --- > include/block/block-common.h | 43 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 43 insertions(+) > > diff --git a/include/block/block-common.h b/include/block/block-common.h > index fdb7306e78..36bd0e480e 100644 > --- a/include/block/block-common.h > +++ b/include/block/block-common.h > @@ -49,6 +49,49 @@ typedef struct BlockDriver BlockDriver; > typedef struct BdrvChild BdrvChild; > typedef struct BdrvChildClass BdrvChildClass; > > +typedef enum BlockZoneOp { > + BLK_ZO_OPEN, > + BLK_ZO_CLOSE, > + BLK_ZO_FINISH, > + BLK_ZO_RESET, > +} BlockZoneOp; > + > +typedef enum BlockZoneModel { > + BLK_Z_NONE = 0x0, /* Regular block device */ > + BLK_Z_HM = 0x1, /* Host-managed zoned block device */ > + BLK_Z_HA = 0x2, /* Host-aware zoned block device */ > +} BlockZoneModel; > + > +typedef enum BlockZoneCondition { > + BLK_ZS_NOT_WP = 0x0, > + BLK_ZS_EMPTY = 0x1, > + BLK_ZS_IOPEN = 0x2, > + BLK_ZS_EOPEN = 0x3, > + BLK_ZS_CLOSED = 0x4, > + BLK_ZS_RDONLY = 0xD, > + BLK_ZS_FULL = 0xE, > + BLK_ZS_OFFLINE = 0xF, > +} BlockZoneCondition; > + > +typedef enum BlockZoneType { > + BLK_ZT_CONV = 0x1, /* Conventional random writes supported */ > + BLK_ZT_SWR = 0x2, /* Sequential writes required */ > + BLK_ZT_SWP = 0x3, /* Sequential writes preferred */ > +} BlockZoneType; > + > +/* > + * Zone descriptor data structure. > + * Provides information on a zone with all position and size values in bytes. I'm glad that you chose bytes here for use in qemu. But since the kernel struct blk_zone uses sectors instead of bytes, is it worth adding a sentence that we intentionally use bytes here, different from Linux, to make it easier for reviewers to realize that scaling when translating between qemu and kernel is necessary? > + */ > +typedef struct BlockZoneDescriptor { > + uint64_t start; > + uint64_t length; > + uint64_t cap; > + uint64_t wp; > + BlockZoneType type; > + BlockZoneCondition cond; > +} BlockZoneDescriptor; > + > typedef struct BlockDriverInfo { > /* in bytes, 0 if irrelevant */ > int cluster_size; > -- > 2.37.3 >
Eric Blake <eblake@redhat.com> 于2022年9月15日周四 16:05写道： > > On Sat, Sep 10, 2022 at 01:27:53PM +0800, Sam Li wrote: > > Signed-off-by: Sam Li <faithilikerun@gmail.com> > > Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> > > Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > > --- > > include/block/block-common.h | 43 ++++++++++++++++++++++++++++++++++++ > > 1 file changed, 43 insertions(+) > > > > diff --git a/include/block/block-common.h b/include/block/block-common.h > > index fdb7306e78..36bd0e480e 100644 > > --- a/include/block/block-common.h > > +++ b/include/block/block-common.h > > @@ -49,6 +49,49 @@ typedef struct BlockDriver BlockDriver; > > typedef struct BdrvChild BdrvChild; > > typedef struct BdrvChildClass BdrvChildClass; > > > > +typedef enum BlockZoneOp { > > + BLK_ZO_OPEN, > > + BLK_ZO_CLOSE, > > + BLK_ZO_FINISH, > > + BLK_ZO_RESET, > > +} BlockZoneOp; > > + > > +typedef enum BlockZoneModel { > > + BLK_Z_NONE = 0x0, /* Regular block device */ > > + BLK_Z_HM = 0x1, /* Host-managed zoned block device */ > > + BLK_Z_HA = 0x2, /* Host-aware zoned block device */ > > +} BlockZoneModel; > > + > > +typedef enum BlockZoneCondition { > > + BLK_ZS_NOT_WP = 0x0, > > + BLK_ZS_EMPTY = 0x1, > > + BLK_ZS_IOPEN = 0x2, > > + BLK_ZS_EOPEN = 0x3, > > + BLK_ZS_CLOSED = 0x4, > > + BLK_ZS_RDONLY = 0xD, > > + BLK_ZS_FULL = 0xE, > > + BLK_ZS_OFFLINE = 0xF, > > +} BlockZoneCondition; > > + > > +typedef enum BlockZoneType { > > + BLK_ZT_CONV = 0x1, /* Conventional random writes supported */ > > + BLK_ZT_SWR = 0x2, /* Sequential writes required */ > > + BLK_ZT_SWP = 0x3, /* Sequential writes preferred */ > > +} BlockZoneType; > > + > > +/* > > + * Zone descriptor data structure. > > + * Provides information on a zone with all position and size values in bytes. > > I'm glad that you chose bytes here for use in qemu. But since the > kernel struct blk_zone uses sectors instead of bytes, is it worth > adding a sentence that we intentionally use bytes here, different from > Linux, to make it easier for reviewers to realize that scaling when > translating between qemu and kernel is necessary? Sorry about the unit mistake. The zone information is in sectors which is the same as kernel struct blk_zone. I think adding a sentence to inform the sector unit makes it clear what the zone descriptor is. > > > + */ > > +typedef struct BlockZoneDescriptor { > > + uint64_t start; > > + uint64_t length; > > + uint64_t cap; > > + uint64_t wp; > > + BlockZoneType type; > > + BlockZoneCondition cond; > > +} BlockZoneDescriptor; > > + > > typedef struct BlockDriverInfo { > > /* in bytes, 0 if irrelevant */ > > int cluster_size; > > -- > > 2.37.3 > > > > -- > Eric Blake, Principal Software Engineer > Red Hat, Inc. +1-919-301-3266 > Virtualization: qemu.org | libvirt.org >
On Thu, Sep 15, 2022 at 06:06:38PM +0800, Sam Li wrote: > Eric Blake <eblake@redhat.com> 于2022年9月15日周四 16:05写道： > > > > On Sat, Sep 10, 2022 at 01:27:53PM +0800, Sam Li wrote: > > > Signed-off-by: Sam Li <faithilikerun@gmail.com> > > > Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> > > > Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > > > --- > > > include/block/block-common.h | 43 ++++++++++++++++++++++++++++++++++++ > > > 1 file changed, 43 insertions(+) > > > > > > diff --git a/include/block/block-common.h b/include/block/block-common.h > > > index fdb7306e78..36bd0e480e 100644 > > > --- a/include/block/block-common.h > > > +++ b/include/block/block-common.h > > > @@ -49,6 +49,49 @@ typedef struct BlockDriver BlockDriver; > > > typedef struct BdrvChild BdrvChild; > > > typedef struct BdrvChildClass BdrvChildClass; > > > > > > +typedef enum BlockZoneOp { > > > + BLK_ZO_OPEN, > > > + BLK_ZO_CLOSE, > > > + BLK_ZO_FINISH, > > > + BLK_ZO_RESET, > > > +} BlockZoneOp; > > > + > > > +typedef enum BlockZoneModel { > > > + BLK_Z_NONE = 0x0, /* Regular block device */ > > > + BLK_Z_HM = 0x1, /* Host-managed zoned block device */ > > > + BLK_Z_HA = 0x2, /* Host-aware zoned block device */ > > > +} BlockZoneModel; > > > + > > > +typedef enum BlockZoneCondition { > > > + BLK_ZS_NOT_WP = 0x0, > > > + BLK_ZS_EMPTY = 0x1, > > > + BLK_ZS_IOPEN = 0x2, > > > + BLK_ZS_EOPEN = 0x3, > > > + BLK_ZS_CLOSED = 0x4, > > > + BLK_ZS_RDONLY = 0xD, > > > + BLK_ZS_FULL = 0xE, > > > + BLK_ZS_OFFLINE = 0xF, > > > +} BlockZoneCondition; > > > + > > > +typedef enum BlockZoneType { > > > + BLK_ZT_CONV = 0x1, /* Conventional random writes supported */ > > > + BLK_ZT_SWR = 0x2, /* Sequential writes required */ > > > + BLK_ZT_SWP = 0x3, /* Sequential writes preferred */ > > > +} BlockZoneType; > > > + > > > +/* > > > + * Zone descriptor data structure. > > > + * Provides information on a zone with all position and size values in bytes. > > > > I'm glad that you chose bytes here for use in qemu. But since the > > kernel struct blk_zone uses sectors instead of bytes, is it worth > > adding a sentence that we intentionally use bytes here, different from > > Linux, to make it easier for reviewers to realize that scaling when > > translating between qemu and kernel is necessary? > > Sorry about the unit mistake. The zone information is in sectors which > is the same as kernel struct blk_zone. I think adding a sentence to > inform the sector unit makes it clear what the zone descriptor is. I'd make the units bytes for consistency with the rest of the QEMU block layer. For example, the MapEntry structure that "qemu-img map" reports has names with similar fields and they are in bytes: struct MapEntry { int64_t start; int64_t length; Stefan
Stefan Hajnoczi <stefanha@redhat.com> 于2022年9月18日周日 04:17写道： > > On Thu, Sep 15, 2022 at 06:06:38PM +0800, Sam Li wrote: > > Eric Blake <eblake@redhat.com> 于2022年9月15日周四 16:05写道： > > > > > > On Sat, Sep 10, 2022 at 01:27:53PM +0800, Sam Li wrote: > > > > Signed-off-by: Sam Li <faithilikerun@gmail.com> > > > > Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> > > > > Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > > > > --- > > > > include/block/block-common.h | 43 ++++++++++++++++++++++++++++++++++++ > > > > 1 file changed, 43 insertions(+) > > > > > > > > diff --git a/include/block/block-common.h b/include/block/block-common.h > > > > index fdb7306e78..36bd0e480e 100644 > > > > --- a/include/block/block-common.h > > > > +++ b/include/block/block-common.h > > > > @@ -49,6 +49,49 @@ typedef struct BlockDriver BlockDriver; > > > > typedef struct BdrvChild BdrvChild; > > > > typedef struct BdrvChildClass BdrvChildClass; > > > > > > > > +typedef enum BlockZoneOp { > > > > + BLK_ZO_OPEN, > > > > + BLK_ZO_CLOSE, > > > > + BLK_ZO_FINISH, > > > > + BLK_ZO_RESET, > > > > +} BlockZoneOp; > > > > + > > > > +typedef enum BlockZoneModel { > > > > + BLK_Z_NONE = 0x0, /* Regular block device */ > > > > + BLK_Z_HM = 0x1, /* Host-managed zoned block device */ > > > > + BLK_Z_HA = 0x2, /* Host-aware zoned block device */ > > > > +} BlockZoneModel; > > > > + > > > > +typedef enum BlockZoneCondition { > > > > + BLK_ZS_NOT_WP = 0x0, > > > > + BLK_ZS_EMPTY = 0x1, > > > > + BLK_ZS_IOPEN = 0x2, > > > > + BLK_ZS_EOPEN = 0x3, > > > > + BLK_ZS_CLOSED = 0x4, > > > > + BLK_ZS_RDONLY = 0xD, > > > > + BLK_ZS_FULL = 0xE, > > > > + BLK_ZS_OFFLINE = 0xF, > > > > +} BlockZoneCondition; > > > > + > > > > +typedef enum BlockZoneType { > > > > + BLK_ZT_CONV = 0x1, /* Conventional random writes supported */ > > > > + BLK_ZT_SWR = 0x2, /* Sequential writes required */ > > > > + BLK_ZT_SWP = 0x3, /* Sequential writes preferred */ > > > > +} BlockZoneType; > > > > + > > > > +/* > > > > + * Zone descriptor data structure. > > > > + * Provides information on a zone with all position and size values in bytes. > > > > > > I'm glad that you chose bytes here for use in qemu. But since the > > > kernel struct blk_zone uses sectors instead of bytes, is it worth > > > adding a sentence that we intentionally use bytes here, different from > > > Linux, to make it easier for reviewers to realize that scaling when > > > translating between qemu and kernel is necessary? > > > > Sorry about the unit mistake. The zone information is in sectors which > > is the same as kernel struct blk_zone. I think adding a sentence to > > inform the sector unit makes it clear what the zone descriptor is. > > I'd make the units bytes for consistency with the rest of the QEMU block > layer. For example, the MapEntry structure that "qemu-img map" reports > has names with similar fields and they are in bytes: > > struct MapEntry { > int64_t start; > int64_t length; > I think the zone descriptor uses sector units because ioctl() will report zones in sector units. Making blk_zone.offset = zone_descriptor.offset is more convenient than using byte units where it needs make conversions twice(sector -> byte -> sector in zone descriptors and offset argument in bdrv_co_zone_report). The MapEntry uses byte units because lseek() in bdrv_co_block_status suggests the file offset is set to bytes and I think it may be why the rest of the block layer uses bytes(not sure). I do not object to using bytes here but it would require some compromises. If I was wrong about anything, please let me know. Sam
On 9/19/22 09:50, Sam Li wrote: > Stefan Hajnoczi <stefanha@redhat.com> 于2022年9月18日周日 04:17写道： >> >> On Thu, Sep 15, 2022 at 06:06:38PM +0800, Sam Li wrote: >>> Eric Blake <eblake@redhat.com> 于2022年9月15日周四 16:05写道： >>>> >>>> On Sat, Sep 10, 2022 at 01:27:53PM +0800, Sam Li wrote: >>>>> Signed-off-by: Sam Li <faithilikerun@gmail.com> >>>>> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> >>>>> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> >>>>> --- >>>>> include/block/block-common.h | 43 ++++++++++++++++++++++++++++++++++++ >>>>> 1 file changed, 43 insertions(+) >>>>> >>>>> diff --git a/include/block/block-common.h b/include/block/block-common.h >>>>> index fdb7306e78..36bd0e480e 100644 >>>>> --- a/include/block/block-common.h >>>>> +++ b/include/block/block-common.h >>>>> @@ -49,6 +49,49 @@ typedef struct BlockDriver BlockDriver; >>>>> typedef struct BdrvChild BdrvChild; >>>>> typedef struct BdrvChildClass BdrvChildClass; >>>>> >>>>> +typedef enum BlockZoneOp { >>>>> + BLK_ZO_OPEN, >>>>> + BLK_ZO_CLOSE, >>>>> + BLK_ZO_FINISH, >>>>> + BLK_ZO_RESET, >>>>> +} BlockZoneOp; >>>>> + >>>>> +typedef enum BlockZoneModel { >>>>> + BLK_Z_NONE = 0x0, /* Regular block device */ >>>>> + BLK_Z_HM = 0x1, /* Host-managed zoned block device */ >>>>> + BLK_Z_HA = 0x2, /* Host-aware zoned block device */ >>>>> +} BlockZoneModel; >>>>> + >>>>> +typedef enum BlockZoneCondition { >>>>> + BLK_ZS_NOT_WP = 0x0, >>>>> + BLK_ZS_EMPTY = 0x1, >>>>> + BLK_ZS_IOPEN = 0x2, >>>>> + BLK_ZS_EOPEN = 0x3, >>>>> + BLK_ZS_CLOSED = 0x4, >>>>> + BLK_ZS_RDONLY = 0xD, >>>>> + BLK_ZS_FULL = 0xE, >>>>> + BLK_ZS_OFFLINE = 0xF, >>>>> +} BlockZoneCondition; >>>>> + >>>>> +typedef enum BlockZoneType { >>>>> + BLK_ZT_CONV = 0x1, /* Conventional random writes supported */ >>>>> + BLK_ZT_SWR = 0x2, /* Sequential writes required */ >>>>> + BLK_ZT_SWP = 0x3, /* Sequential writes preferred */ >>>>> +} BlockZoneType; >>>>> + >>>>> +/* >>>>> + * Zone descriptor data structure. >>>>> + * Provides information on a zone with all position and size values in bytes. >>>> >>>> I'm glad that you chose bytes here for use in qemu. But since the >>>> kernel struct blk_zone uses sectors instead of bytes, is it worth >>>> adding a sentence that we intentionally use bytes here, different from >>>> Linux, to make it easier for reviewers to realize that scaling when >>>> translating between qemu and kernel is necessary? >>> >>> Sorry about the unit mistake. The zone information is in sectors which >>> is the same as kernel struct blk_zone. I think adding a sentence to >>> inform the sector unit makes it clear what the zone descriptor is. >> >> I'd make the units bytes for consistency with the rest of the QEMU block >> layer. For example, the MapEntry structure that "qemu-img map" reports >> has names with similar fields and they are in bytes: >> >> struct MapEntry { >> int64_t start; >> int64_t length; >> > > I think the zone descriptor uses sector units because ioctl() will > report zones in sector units. Making blk_zone.offset = > zone_descriptor.offset is more convenient than using byte units where > it needs make conversions twice(sector -> byte -> sector in zone > descriptors and offset argument in bdrv_co_zone_report). The MapEntry > uses byte units because lseek() in bdrv_co_block_status suggests the > file offset is set to bytes and I think it may be why the rest of the > block layer uses bytes(not sure). > > I do not object to using bytes here but it would require some > compromises. If I was wrong about anything, please let me know. The conversion can be done using 9-bits left and right shifts, which are cheap to do. I think it is important to be consistent with qemu block API, so using for the API bytes is preferred. That will avoid confusions. > > > Sam
Damien Le Moal <damien.lemoal@opensource.wdc.com>于2022年9月19日 周一16:04写道： > On 9/19/22 09:50, Sam Li wrote: > > Stefan Hajnoczi <stefanha@redhat.com> 于2022年9月18日周日 04:17写道： > >> > >> On Thu, Sep 15, 2022 at 06:06:38PM +0800, Sam Li wrote: > >>> Eric Blake <eblake@redhat.com> 于2022年9月15日周四 16:05写道： > >>>> > >>>> On Sat, Sep 10, 2022 at 01:27:53PM +0800, Sam Li wrote: > >>>>> Signed-off-by: Sam Li <faithilikerun@gmail.com> > >>>>> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> > >>>>> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > >>>>> --- > >>>>> include/block/block-common.h | 43 > ++++++++++++++++++++++++++++++++++++ > >>>>> 1 file changed, 43 insertions(+) > >>>>> > >>>>> diff --git a/include/block/block-common.h > b/include/block/block-common.h > >>>>> index fdb7306e78..36bd0e480e 100644 > >>>>> --- a/include/block/block-common.h > >>>>> +++ b/include/block/block-common.h > >>>>> @@ -49,6 +49,49 @@ typedef struct BlockDriver BlockDriver; > >>>>> typedef struct BdrvChild BdrvChild; > >>>>> typedef struct BdrvChildClass BdrvChildClass; > >>>>> > >>>>> +typedef enum BlockZoneOp { > >>>>> + BLK_ZO_OPEN, > >>>>> + BLK_ZO_CLOSE, > >>>>> + BLK_ZO_FINISH, > >>>>> + BLK_ZO_RESET, > >>>>> +} BlockZoneOp; > >>>>> + > >>>>> +typedef enum BlockZoneModel { > >>>>> + BLK_Z_NONE = 0x0, /* Regular block device */ > >>>>> + BLK_Z_HM = 0x1, /* Host-managed zoned block device */ > >>>>> + BLK_Z_HA = 0x2, /* Host-aware zoned block device */ > >>>>> +} BlockZoneModel; > >>>>> + > >>>>> +typedef enum BlockZoneCondition { > >>>>> + BLK_ZS_NOT_WP = 0x0, > >>>>> + BLK_ZS_EMPTY = 0x1, > >>>>> + BLK_ZS_IOPEN = 0x2, > >>>>> + BLK_ZS_EOPEN = 0x3, > >>>>> + BLK_ZS_CLOSED = 0x4, > >>>>> + BLK_ZS_RDONLY = 0xD, > >>>>> + BLK_ZS_FULL = 0xE, > >>>>> + BLK_ZS_OFFLINE = 0xF, > >>>>> +} BlockZoneCondition; > >>>>> + > >>>>> +typedef enum BlockZoneType { > >>>>> + BLK_ZT_CONV = 0x1, /* Conventional random writes supported */ > >>>>> + BLK_ZT_SWR = 0x2, /* Sequential writes required */ > >>>>> + BLK_ZT_SWP = 0x3, /* Sequential writes preferred */ > >>>>> +} BlockZoneType; > >>>>> + > >>>>> +/* > >>>>> + * Zone descriptor data structure. > >>>>> + * Provides information on a zone with all position and size values > in bytes. > >>>> > >>>> I'm glad that you chose bytes here for use in qemu. But since the > >>>> kernel struct blk_zone uses sectors instead of bytes, is it worth > >>>> adding a sentence that we intentionally use bytes here, different from > >>>> Linux, to make it easier for reviewers to realize that scaling when > >>>> translating between qemu and kernel is necessary? > >>> > >>> Sorry about the unit mistake. The zone information is in sectors which > >>> is the same as kernel struct blk_zone. I think adding a sentence to > >>> inform the sector unit makes it clear what the zone descriptor is. > >> > >> I'd make the units bytes for consistency with the rest of the QEMU block > >> layer. For example, the MapEntry structure that "qemu-img map" reports > >> has names with similar fields and they are in bytes: > >> > >> struct MapEntry { > >> int64_t start; > >> int64_t length; > >> > > > > I think the zone descriptor uses sector units because ioctl() will > > report zones in sector units. Making blk_zone.offset = > > zone_descriptor.offset is more convenient than using byte units where > > it needs make conversions twice(sector -> byte -> sector in zone > > descriptors and offset argument in bdrv_co_zone_report). The MapEntry > > uses byte units because lseek() in bdrv_co_block_status suggests the > > file offset is set to bytes and I think it may be why the rest of the > > block layer uses bytes(not sure). > > > > I do not object to using bytes here but it would require some > > compromises. If I was wrong about anything, please let me know. > > The conversion can be done using 9-bits left and right shifts, which are > cheap to do. I think it is important to be consistent with qemu block API, > so using for the API bytes is preferred. That will avoid confusions. Ok, will change it. Thanks! > > > > > > > Sam > > -- > Damien Le Moal > Western Digital Research > >
diff --git a/include/block/block-common.h b/include/block/block-common.h index fdb7306e78..36bd0e480e 100644 --- a/include/block/block-common.h +++ b/include/block/block-common.h @@ -49,6 +49,49 @@ typedef struct BlockDriver BlockDriver; typedef struct BdrvChild BdrvChild; typedef struct BdrvChildClass BdrvChildClass; +typedef enum BlockZoneOp { + BLK_ZO_OPEN, + BLK_ZO_CLOSE, + BLK_ZO_FINISH, + BLK_ZO_RESET, +} BlockZoneOp; + +typedef enum BlockZoneModel { + BLK_Z_NONE = 0x0, /* Regular block device */ + BLK_Z_HM = 0x1, /* Host-managed zoned block device */ + BLK_Z_HA = 0x2, /* Host-aware zoned block device */ +} BlockZoneModel; + +typedef enum BlockZoneCondition { + BLK_ZS_NOT_WP = 0x0, + BLK_ZS_EMPTY = 0x1, + BLK_ZS_IOPEN = 0x2, + BLK_ZS_EOPEN = 0x3, + BLK_ZS_CLOSED = 0x4, + BLK_ZS_RDONLY = 0xD, + BLK_ZS_FULL = 0xE, + BLK_ZS_OFFLINE = 0xF, +} BlockZoneCondition; + +typedef enum BlockZoneType { + BLK_ZT_CONV = 0x1, /* Conventional random writes supported */ + BLK_ZT_SWR = 0x2, /* Sequential writes required */ + BLK_ZT_SWP = 0x3, /* Sequential writes preferred */ +} BlockZoneType; + +/* + * Zone descriptor data structure. + * Provides information on a zone with all position and size values in bytes. + */ +typedef struct BlockZoneDescriptor { + uint64_t start; + uint64_t length; + uint64_t cap; + uint64_t wp; + BlockZoneType type; + BlockZoneCondition cond; +} BlockZoneDescriptor; + typedef struct BlockDriverInfo { /* in bytes, 0 if irrelevant */ int cluster_size;