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target: Allow Write Exclusive non-reservation holders to READ

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commit 1ecc758692 upstream.

For PGR reservation of type Write Exclusive Access, allow all non
reservation holding I_T nexuses with active registrations to READ
from the device.

This addresses a bug where active registrations that attempted
to READ would result in an reservation conflict.

Signed-off-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lee Duncan 2015-01-05 10:49:44 -08:00 committed by Greg Kroah-Hartman
parent 5e15feee10
commit 362684ea8f
1 changed files with 12 additions and 0 deletions
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12
drivers/target/target_core_pr.c
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@ -518,6 +518,18 @@ static int core_scsi3_pr_seq_non_holder(
return 0;
}
} else if (we && registered_nexus) {
/*
* Reads are allowed for Write Exclusive locks
* from all registrants.
*/
if (cmd->data_direction == DMA_FROM_DEVICE) {
pr_debug("Allowing READ CDB: 0x%02x for %s"
" reservation\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 0;
}
}
pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
" for %s reservation\n", transport_dump_cmd_direction(cmd),