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255c4f4a6d
If a PR operation fails we can return a device-specific error which is impossible to handle in some cases because we could have a mix of devices when DM is used, or future users like LIO only knows it's interacting with a block device so it doesn't know the type. This patch adds a new pr_status enum so drivers can convert errors to a common type which can be handled by the caller. Signed-off-by: Mike Christie <michael.christie@oracle.com> Link: https://lore.kernel.org/r/20221122032603.32766-2-michael.christie@oracle.com Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_PR_H
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#define _UAPI_PR_H
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#include <linux/types.h>
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enum pr_status {
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PR_STS_SUCCESS = 0x0,
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/*
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* The following error codes are based on SCSI, because the interface
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* was originally created for it and has existing users.
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*/
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/* Generic device failure. */
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PR_STS_IOERR = 0x2,
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PR_STS_RESERVATION_CONFLICT = 0x18,
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/* Temporary path failure that can be retried. */
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PR_STS_RETRY_PATH_FAILURE = 0xe0000,
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/* The request was failed due to a fast failure timer. */
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PR_STS_PATH_FAST_FAILED = 0xf0000,
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/* The path cannot be reached and has been marked as failed. */
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PR_STS_PATH_FAILED = 0x10000,
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};
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enum pr_type {
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PR_WRITE_EXCLUSIVE = 1,
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PR_EXCLUSIVE_ACCESS = 2,
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PR_WRITE_EXCLUSIVE_REG_ONLY = 3,
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PR_EXCLUSIVE_ACCESS_REG_ONLY = 4,
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PR_WRITE_EXCLUSIVE_ALL_REGS = 5,
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PR_EXCLUSIVE_ACCESS_ALL_REGS = 6,
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};
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struct pr_reservation {
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__u64 key;
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__u32 type;
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__u32 flags;
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};
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struct pr_registration {
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__u64 old_key;
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__u64 new_key;
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__u32 flags;
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__u32 __pad;
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};
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struct pr_preempt {
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__u64 old_key;
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__u64 new_key;
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__u32 type;
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__u32 flags;
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};
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struct pr_clear {
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__u64 key;
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__u32 flags;
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__u32 __pad;
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};
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#define PR_FL_IGNORE_KEY (1 << 0) /* ignore existing key */
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#define IOC_PR_REGISTER _IOW('p', 200, struct pr_registration)
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#define IOC_PR_RESERVE _IOW('p', 201, struct pr_reservation)
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#define IOC_PR_RELEASE _IOW('p', 202, struct pr_reservation)
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#define IOC_PR_PREEMPT _IOW('p', 203, struct pr_preempt)
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#define IOC_PR_PREEMPT_ABORT _IOW('p', 204, struct pr_preempt)
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#define IOC_PR_CLEAR _IOW('p', 205, struct pr_clear)
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#endif /* _UAPI_PR_H */
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