b855f8d175
Introduce a privileged helper to run persistent reservation commands. This lets virtual machines send persistent reservations without using CAP_SYS_RAWIO or out-of-tree patches. The helper uses Unix permissions and SCM_RIGHTS to restrict access to processes that can access its socket and prove that they have an open file descriptor for a raw SCSI device. The next patch will also correct the usage of persistent reservations with multipath devices. It would also be possible to support for Linux's IOC_PR_* ioctls in the future, to support NVMe devices. For now, however, only SCSI is supported. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
/* Definitions for QEMU's persistent reservation helper daemon
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*
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* Copyright (C) 2017 Red Hat, Inc.
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*
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* Author:
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* Paolo Bonzini <pbonzini@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef QEMU_PR_HELPER_H
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#define QEMU_PR_HELPER_H 1
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#include <stdint.h>
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#define PR_HELPER_CDB_SIZE 16
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#define PR_HELPER_SENSE_SIZE 96
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#define PR_HELPER_DATA_SIZE 8192
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typedef struct PRHelperResponse {
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int32_t result;
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int32_t sz;
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uint8_t sense[PR_HELPER_SENSE_SIZE];
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} PRHelperResponse;
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#endif
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