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sed-opal: geometry feature reporting command

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Locking range start and locking range length
attributes may be require to satisfy restrictions
exposed by OPAL2 geometry feature reporting.

Geometry reporting feature is described in TCG OPAL SSC,
section 3.1.1.4 (ALIGN, LogicalBlockSize, AlignmentGranularity
and LowestAlignedLBA).

4.3.5.2.1.1 RangeStart Behavior:

[ StartAlignment = (RangeStart modulo AlignmentGranularity) - LowestAlignedLBA ]

When processing a Set method or CreateRow method on the Locking
table for a non-Global Range row, if:

a) the AlignmentRequired (ALIGN above) column in the LockingInfo
   table is TRUE;
b) RangeStart is non-zero; and
c) StartAlignment is non-zero, then the method SHALL fail and
   return an error status code INVALID_PARAMETER.

4.3.5.2.1.2 RangeLength Behavior:

If RangeStart is zero, then
	[ LengthAlignment = (RangeLength modulo AlignmentGranularity) - LowestAlignedLBA ]

If RangeStart is non-zero, then
	[ LengthAlignment = (RangeLength modulo AlignmentGranularity) ]

When processing a Set method or CreateRow method on the Locking
table for a non-Global Range row, if:

a) the AlignmentRequired (ALIGN above) column in the LockingInfo
   table is TRUE;
b) RangeLength is non-zero; and
c) LengthAlignment is non-zero, then the method SHALL fail and
   return an error status code INVALID_PARAMETER

In userspace we stuck to logical block size reported by general
block device (via sysfs or ioctl), but we can not read
'AlignmentGranularity' or 'LowestAlignedLBA' anywhere else and
we need to get those values from sed-opal interface otherwise
we will not be able to report or avoid locking range setup
INVALID_PARAMETER errors above.

Signed-off-by: Ondrej Kozina <okozina@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Tested-by: Milan Broz <gmazyland@gmail.com>
Link: https://lore.kernel.org/r/20230411090931.9193-2-okozina@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ondrej Kozina
2023-04-11 11:09:31 +02:00
committed by Jens Axboe
parent 63f8793ee6
commit 9e05a2599a
3 changed files with 42 additions and 1 deletions
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include/uapi/linux/sed-opal.h
+13
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@@ -161,6 +161,18 @@ struct opal_status {
__u32 reserved;
};
/*
* Geometry Reporting per TCG Storage OPAL SSC
* section 3.1.1.4
*/
struct opal_geometry {
__u8 align;
__u32 logical_block_size;
__u64 alignment_granularity;
__u64 lowest_aligned_lba;
__u8 __align[3];
};
#define IOC_OPAL_SAVE _IOW('p', 220, struct opal_lock_unlock)
#define IOC_OPAL_LOCK_UNLOCK _IOW('p', 221, struct opal_lock_unlock)
#define IOC_OPAL_TAKE_OWNERSHIP _IOW('p', 222, struct opal_key)
@@ -179,5 +191,6 @@ struct opal_status {
#define IOC_OPAL_GENERIC_TABLE_RW _IOW('p', 235, struct opal_read_write_table)
#define IOC_OPAL_GET_STATUS _IOR('p', 236, struct opal_status)
#define IOC_OPAL_GET_LR_STATUS _IOW('p', 237, struct opal_lr_status)
#define IOC_OPAL_GET_GEOMETRY _IOR('p', 238, struct opal_geometry)
#endif /* _UAPI_SED_OPAL_H */