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Allocate a pseudo SCSI device if 'nr_reserved_cmds' has been set. Pseudo SCSI devices have the SCSI ID <max_id>:U64_MAX so they won't clash with any devices the LLD might create. Pseudo SCSI devices are excluded from scanning and will not show up in sysfs. Additionally, pseudo SCSI devices are skipped by shost_for_each_device(). This prevents that the SCSI error handler tries to submit a reset to a non-existent logical unit. Do not allocate a budget map for pseudo SCSI devices since the cmd_per_lun limit does not apply to pseudo SCSI devices. Do not perform queue depth ramp up / ramp down for pseudo SCSI devices. Pseudo SCSI devices will be used to send internal commands to a storage device. [ bvanassche: edited patch description / renamed host_sdev into pseudo_sdev / unexported scsi_get_host_dev() / modified error path in scsi_get_pseudo_dev() / skip pseudo devices in __scsi_iterate_devices() and also when calling sdev_init(), sdev_configure() and sdev_destroy(). See also https://lore.kernel.org/linux-scsi/20211125151048.103910-2-hare@suse.de/ ] Reviewed-by: John Garry <john.g.garry@oracle.com> Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://patch.msgid.link/20251031204029.2883185-5-bvanassche@acm.org Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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