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block: Add error codes for common PR failures

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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>
This commit is contained in:
Mike Christie 2022-11-21 21:26:00 -06:00 committed by Martin K. Petersen
parent 9f5436f47c
commit 255c4f4a6d
1 changed files with 17 additions and 0 deletions
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17
include/uapi/linux/pr.h
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@ -4,6 +4,23 @@
#include <linux/types.h>
enum pr_status {
PR_STS_SUCCESS = 0x0,
/*
* The following error codes are based on SCSI, because the interface
* was originally created for it and has existing users.
*/
/* Generic device failure. */
PR_STS_IOERR = 0x2,
PR_STS_RESERVATION_CONFLICT = 0x18,
/* Temporary path failure that can be retried. */
PR_STS_RETRY_PATH_FAILURE = 0xe0000,
/* The request was failed due to a fast failure timer. */
PR_STS_PATH_FAST_FAILED = 0xf0000,
/* The path cannot be reached and has been marked as failed. */
PR_STS_PATH_FAILED = 0x10000,
};
enum pr_type {
PR_WRITE_EXCLUSIVE = 1,
PR_EXCLUSIVE_ACCESS = 2,