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2c47f9efbe
tgt uses scsi_host as I_T nexus. This works for ibmvstgt because it creates one scsi_host for one initiator. However, other target drivers don't work like that. This adds I_T nexus support, which enable one scsi_host to handle multiple initiators. New scsi_tgt_it_nexus_create/destroy functions are expected be called transport classes. For example, ibmvstgt creates an initiator remote port, then the srp transport calls tgt_it_nexus_create. tgt doesn't manages I_T nexus, instead it tells tgtd, user-space daemon, to create a new I_T nexus. On the receiving the response from tgtd, tgt calls shost->transportt->it_nexus_response. transports should notify a lld. The srp transport uses it_nexus_response callback in srp_function_template to do that. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
22 lines
807 B
C
22 lines
807 B
C
/*
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* SCSI target definitions
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*/
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#include <linux/dma-mapping.h>
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struct Scsi_Host;
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struct scsi_cmnd;
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struct scsi_lun;
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extern struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *);
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extern int scsi_tgt_alloc_queue(struct Scsi_Host *);
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extern void scsi_tgt_free_queue(struct Scsi_Host *);
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extern int scsi_tgt_queue_command(struct scsi_cmnd *, u64, struct scsi_lun *, u64);
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extern int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *, u64, int, u64,
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struct scsi_lun *, void *);
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extern struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *,
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enum dma_data_direction, gfp_t);
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extern void scsi_host_put_command(struct Scsi_Host *, struct scsi_cmnd *);
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extern int scsi_tgt_it_nexus_create(struct Scsi_Host *, u64, char *);
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extern int scsi_tgt_it_nexus_destroy(struct Scsi_Host *, u64);
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