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don't ask for size when creating backstore for existing file #1

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agrover opened this issue Dec 5, 2011 · 1 comment
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don't ask for size when creating backstore for existing file #1

agrover opened this issue Dec 5, 2011 · 1 comment

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@agrover
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agrover commented Dec 5, 2011

Why must we specify file size when creating a file backstore? We should simply use the size of the existing file (if present).

If the file does not exist, then we can create it using the given file size.
@agrover
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agrover commented Dec 13, 2011

fixed in 2.1.fb2

@agrover agrover closed this as completed Dec 13, 2011
agrover pushed a commit that referenced this issue Jun 12, 2012
add spec for the usb_gadget
3fb0fc8 
|root@squsb:~# mount a -t configfs /sys/kernel/config
|root@squsb:~# modprobe dummy_hcd
|root@squsb:~# targetcli
|Welcome to the targetcli shell:
|
| Copyright (c) 2011 by RisingTide Systems LLC.
|
|Visit us at http://www.risingtidesystems.com.
|
|Can't load fabric module qla2xxx.
|Can't load fabric module ib_srpt.
|Loaded iscsi_target_mod kernel module.
|Created '/sys/kernel/config/target/iscsi'.
|Done loading iscsi fabric module.
|Created '/sys/kernel/config/target/loopback'.
|Done loading loopback fabric module.
|Can't load fabric module tcm_fc.
|Created '/sys/kernel/config/target/usb_gadget'.
|Done loading usb_gadget fabric module.
|
|/backstores/rd_mcp> create disk 256M
|Generating a wwn serial.
|Created rd_mcp ramdisk disk with size 256M.
|Entering new node /backstores/rd_mcp/disk
|
|/usb_gadget> create
|Created target naa.60014052d9f751dd.
|Entering new node /usb_gadget/naa.60014052d9f751dd
|/usb_gadget/n...14052d9f751dd> cd luns
|/usb_gadget/n...d9f751dd/luns> create /backstores/rd_mcp/disk
|Selected LUN 0.
|Successfully created LUN 0.
|Entering new node /usb_gadget/naa.60014052d9f751dd/luns/lun0
|/usb_gadget/n...1dd/luns/lun0>
|/usb_gadget/n...1dd/luns/lun0> cd ..
|/usb_gadget/n...d9f751dd/luns> cd ..
|/usb_gadget/n...14052d9f751dd> disable
|The TPGT has been disabled.
|/usb_gadget/n...14052d9f751dd> enable
|The TPGT has been enabled.

after that on the host side:

|[  227.097768] usb 1-1: configuration #1 chosen from 1 choice
|[  227.100157]  gadget: high-speed config #1: Linux Target
|[  227.102934] Using the BOT protocol
|[  227.115756] Using the UAS protocol
|[  227.121483] scsi1 : uas
|[  227.128314] scsi 1:0:0:0: Direct-Access     LIO-ORG  RAMDISK-MCP      4.0  PQ: 0 ANSI: 5 TAG: 1
|[  227.164322] sd 1:0:0:0: [sda] 524288 512-byte logical blocks: (268 MB/256 MiB)
|[  227.204283] sd 1:0:0:0: [sda] Write Protect is off
|[  227.204904] sd 1:0:0:0: [sda] Mode Sense: 2f 00 00 00
|[  227.220285] sd 1:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
|[  227.300319]  sda: unknown partition table
|[  227.376286] sd 1:0:0:0: [sda] Attached SCSI disk

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andy Grover <agrover@redhat.com>
@mikechristie mikechristie mentioned this issue Feb 22, 2018
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@lremember lremember mentioned this issue Jan 12, 2023
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