We can issue a host bus scan on Linux host to get the /dev/sd* devices on host.
The scan is issued using this command :
echo "- - -" > /sys/class/scsi_host/host0/scan
Can someone please tell me the flow of events in the Linux userspace/kernel code which leads to formation of /dev/sd* devices post scsi scan ?
Is this a PCI bus scan OR SCSI commands sent to controller of storage OR something new ?
How does a rescan LUN on Linux works
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Looked upon the code how iscsid scan works. __scsi_scan_target is the key function which does the SCSI scan. This function first it tries to probe and add LUN 0 using scsi_probe_and_add_lun function.
scsi_probe_and_add_lun function will :
1. allocate scsi_device data structure
2. call scsi_probe_lun and send SCSI enquiries to LUN 0.
3. call scsi_add_lun to fill the scsi_device data structure from the enquiries done.
this data structure is added using scsi_sysfs_add_sdev function.
Then it tries to send SCSI report LUN command to get the number of LUNS in function scsi_report_lun_scan. This function finds the number of LUNs and again tries to add all the LUNs using scsi_probe_and_add_lun function.
scsi_sysfs_add_sdev function adds the devices by calling scsi_target_add and device_add for scsi_device.
This device_add calls the drivers' probe function (sd_probe):
linux-3.14.69\drivers\scsi\sd.c
This sd_probe function allocates the disk and launches thread sd_probe_async.
sd_probe_async calls add_disk and prints the message : "Attached SCSI %sdisk"