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https://github.com/torvalds/linux
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ce70fd9a55
Now that each scsi_request is backed by a scsi_cmnd, there is no need to indirect the CDB storage. Change all submitters of SCSI passthrough requests to store the CDB information directly in the scsi_cmnd, and while doing so allocate the full 32 bytes that cover all Linux supported SCSI hosts instead of requiring dynamic allocation for > 16 byte CDBs. On 64-bit systems this does not change the size of the scsi_cmnd at all, while on 32-bit systems it slightly increases it for now, but that increase will be made up by the removal of the remaining scsi_request fields. Link: https://lore.kernel.org/r/20220224175552.988286-4-hch@lst.de Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _SCSI_SCSI_EH_H
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#define _SCSI_SCSI_EH_H
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#include <linux/scatterlist.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_common.h>
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struct scsi_device;
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struct Scsi_Host;
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extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
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struct list_head *done_q);
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extern void scsi_eh_flush_done_q(struct list_head *done_q);
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extern void scsi_report_bus_reset(struct Scsi_Host *, int);
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extern void scsi_report_device_reset(struct Scsi_Host *, int, int);
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extern int scsi_block_when_processing_errors(struct scsi_device *);
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extern bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd,
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struct scsi_sense_hdr *sshdr);
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extern enum scsi_disposition scsi_check_sense(struct scsi_cmnd *);
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static inline bool scsi_sense_is_deferred(const struct scsi_sense_hdr *sshdr)
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{
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return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1));
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}
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extern bool scsi_get_sense_info_fld(const u8 *sense_buffer, int sb_len,
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u64 *info_out);
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extern int scsi_ioctl_reset(struct scsi_device *, int __user *);
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struct scsi_eh_save {
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/* saved state */
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int result;
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unsigned int resid_len;
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int eh_eflags;
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enum dma_data_direction data_direction;
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unsigned underflow;
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unsigned char cmd_len;
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unsigned char prot_op;
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unsigned char cmnd[32];
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struct scsi_data_buffer sdb;
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struct scatterlist sense_sgl;
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};
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extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,
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struct scsi_eh_save *ses, unsigned char *cmnd,
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int cmnd_size, unsigned sense_bytes);
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extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,
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struct scsi_eh_save *ses);
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#endif /* _SCSI_SCSI_EH_H */
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