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authorEric Blake <eblake@redhat.com>2016-06-23 16:37:10 -0600
committerKevin Wolf <kwolf@redhat.com>2016-07-05 16:46:25 +0200
commitf9e95af0a6be281f56ecc8413ea4a3ac3545ce17 (patch)
treed9bcbcb304a8a3f43e57aecb3051d11579a45d9e /disas
parent202204717a7e73971cccebd38c5d8ac4b0bfcef8 (diff)
iscsi: Advertise realistic limits to block layer
The function sector_limits_lun2qemu() returns a value in units of the block layer's 512-byte sector, and can be as large as 0x40000000, which is much larger than the block layer's inherent limit of BDRV_REQUEST_MAX_SECTORS. The block layer already handles '0' as a synonym to the inherent limit, and it is nicer to return this value than it is to calculate an arbitrary maximum, for two reasons: we want to ensure that the block layer continues to special-case '0' as 'no limit beyond the inherent limits'; and we want to be able to someday expand the block layer to allow 64-bit limits, where auditing for uses of BDRV_REQUEST_MAX_SECTORS will help us make sure we aren't artificially constraining iscsi to old block layer limits. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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