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If a failed command is retried and fails again we need to enter SCSI EH, otherwise we will never be able to recover the command. To detect this situation we must not clear scmd->eh_eflags when EH finishes but rather make it persistent throughout the lifetime of the command. Signed-off-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
55 lines
1.6 KiB
C
55 lines
1.6 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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#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 int 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 int 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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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;
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struct scsi_data_buffer sdb;
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struct request *next_rq;
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/* new command support */
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unsigned char eh_cmnd[BLK_MAX_CDB];
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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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