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https://github.com/torvalds/linux
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0af7b5e236
This adds support in sd.c for the block PR read keys and read reservation callouts, so upper layers like LIO can get the PR info that's been setup using the existing pr callouts and return it to initiators. Signed-off-by: Mike Christie <michael.christie@oracle.com> Link: https://lore.kernel.org/r/20230407200551.12660-6-michael.christie@oracle.com Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Functions used by both the SCSI initiator code and the SCSI target code.
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*/
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#ifndef _SCSI_COMMON_H_
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#define _SCSI_COMMON_H_
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#include <linux/types.h>
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#include <uapi/linux/pr.h>
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#include <scsi/scsi_proto.h>
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enum scsi_pr_type {
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SCSI_PR_WRITE_EXCLUSIVE = 0x01,
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SCSI_PR_EXCLUSIVE_ACCESS = 0x03,
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SCSI_PR_WRITE_EXCLUSIVE_REG_ONLY = 0x05,
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SCSI_PR_EXCLUSIVE_ACCESS_REG_ONLY = 0x06,
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SCSI_PR_WRITE_EXCLUSIVE_ALL_REGS = 0x07,
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SCSI_PR_EXCLUSIVE_ACCESS_ALL_REGS = 0x08,
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};
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enum scsi_pr_type block_pr_type_to_scsi(enum pr_type type);
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enum pr_type scsi_pr_type_to_block(enum scsi_pr_type type);
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static inline unsigned
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scsi_varlen_cdb_length(const void *hdr)
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{
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return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
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}
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extern const unsigned char scsi_command_size_tbl[8];
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#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
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static inline unsigned
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scsi_command_size(const unsigned char *cmnd)
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{
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return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
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scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
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}
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static inline unsigned char
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scsi_command_control(const unsigned char *cmnd)
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{
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return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
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cmnd[1] : cmnd[COMMAND_SIZE(cmnd[0]) - 1];
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}
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/* Returns a human-readable name for the device */
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extern const char *scsi_device_type(unsigned type);
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extern void int_to_scsilun(u64, struct scsi_lun *);
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extern u64 scsilun_to_int(struct scsi_lun *);
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/*
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* This is a slightly modified SCSI sense "descriptor" format header.
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* The addition is to allow the 0x70 and 0x71 response codes. The idea
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* is to place the salient data from either "fixed" or "descriptor" sense
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* format into one structure to ease application processing.
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*
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* The original sense buffer should be kept around for those cases
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* in which more information is required (e.g. the LBA of a MEDIUM ERROR).
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*/
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struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
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u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
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u8 sense_key;
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u8 asc;
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u8 ascq;
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u8 byte4;
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u8 byte5;
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u8 byte6;
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u8 additional_length; /* always 0 for fixed sense format */
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};
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static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
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{
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if (!sshdr)
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return false;
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return (sshdr->response_code & 0x70) == 0x70;
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}
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extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
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struct scsi_sense_hdr *sshdr);
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extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
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int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
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int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
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extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
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int desc_type);
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#endif /* _SCSI_COMMON_H_ */
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