linux-kernel - [PATCH v3 4/4] Documentation: ABI: Fix documentation for mass

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Message-id: <1428596290-23637-5-git-send-email-k.opasiak@samsung.com>
Date:	Thu, 09 Apr 2015 18:18:10 +0200
From:	Krzysztof Opasiak <k.opasiak@...sung.com>
To:	balbi@...com, gregkh@...uxfoundation.org, jlbec@...lplan.org
Cc:	andrzej.p@...sung.com, m.szyprowski@...sung.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Krzysztof Opasiak <k.opasiak@...sung.com>
Subject: [PATCH v3 4/4] Documentation: ABI: Fix documentation for mass_storage
 function

Luns in mass storage function are identified using their id.
While creating lun's directory user cannot choose any arbitrary
name other than decimal value from 1 to FSG_MAX_LUNS.

Moreover, LUNs ids should be contiguous. This means that user
may remove only lun with max id and can create new lun
only if its id equals to max id + 1.

Signed-off-by: Krzysztof Opasiak <k.opasiak@...sung.com>
---
 .../ABI/testing/configfs-usb-gadget-mass-storage   |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/configfs-usb-gadget-mass-storage b/Documentation/ABI/testing/configfs-usb-gadget-mass-storage
index 9931fb0..2bf085d 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget-mass-storage
+++ b/Documentation/ABI/testing/configfs-usb-gadget-mass-storage
@@ -11,10 +11,15 @@ Description:
 				are 2..4. Available only if
 				CONFIG_USB_GADGET_DEBUG_FILES is set.
 
-What:		/config/usb-gadget/gadget/functions/mass_storage.name/lun.name
+What:		/config/usb-gadget/gadget/functions/mass_storage.name/lun.id
 Date:		Oct 2013
 KernelVersion:	3.13
 Description:
+		id - decimal value from 1 to FSG_MAX_LUNS
+		(which is 8 by default) - 1. LUNs should be numbered contiguously.
+		lun.0 is reserved for default lun which appears while creating
+		mass_storage.name directory and cannot be removed by the user.
+
 		The attributes:
 
 		file		- The path to the backing file for the LUN.
-- 
1.7.9.5

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