30b0c37b27
In preparation for bidi we abstract all IO members of scsi_cmnd,
that will need to duplicate, into a substructure.
- Group all IO members of scsi_cmnd into a scsi_data_buffer
structure.
- Adjust accessors to new members.
- scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
scsi_cmnd. And work on it.
- Adjust scsi_init_io() and scsi_release_buffers() for above
change.
- Fix other parts of scsi_lib/scsi.c to members migration. Use
accessors where appropriate.
- fix Documentation about scsi_cmnd in scsi_host.h
- scsi_error.c
* Changed needed members of struct scsi_eh_save.
* Careful considerations in scsi_eh_prep/restore_cmnd.
- sd.c and sr.c
* sd and sr would adjust IO size to align on device's block
size so code needs to change once we move to scsi_data_buff
implementation.
* Convert code to use scsi_for_each_sg
* Use data accessors where appropriate.
- tgt: convert libsrp to use scsi_data_buffer
- isd200: This driver still bangs on scsi_cmnd IO members,
so need changing
[jejb: rebased on top of sg_table patches fixed up conflicts
and used the synergy to eliminate use_sg and sg_count]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
#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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struct scsi_device;
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struct Scsi_Host;
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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 int scsi_sense_valid(struct scsi_sense_hdr *sshdr)
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{
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if (!sshdr)
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return 0;
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return (sshdr->response_code & 0x70) == 0x70;
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}
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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 int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
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struct scsi_sense_hdr *sshdr);
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extern int scsi_command_normalize_sense(struct scsi_cmnd *cmd,
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struct scsi_sense_hdr *sshdr);
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static inline int scsi_sense_is_deferred(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 const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
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int desc_type);
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extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
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u64 * info_out);
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/*
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* Reset request from external source
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*/
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#define SCSI_TRY_RESET_DEVICE 1
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#define SCSI_TRY_RESET_BUS 2
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#define SCSI_TRY_RESET_HOST 3
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extern int scsi_reset_provider(struct scsi_device *, int);
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struct scsi_eh_save {
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/* saved state */
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int result;
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enum dma_data_direction data_direction;
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unsigned char cmd_len;
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unsigned char cmnd[MAX_COMMAND_SIZE];
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struct scsi_data_buffer sdb;
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/* new command support */
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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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