[lkml]   [2012]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH 3/3] usb: gadget: mass_storage: add documentation
    > On Mon, 11 Jun 2012, Michal Nazarewicz wrote:
    >> + Mass Storage Gadget (or MSG) acts as a USB Mass Storage device,
    >> + appearing to the host as a disk or a CD-ROM drive. It supports
    >> + multiple logical units (LUNs). Backing storage for each LUN is
    >> + provided by a regular file or a block device, access can be limited
    >> + to read-only, and gadget can indicate that it is removable and/or
    >> + CD-ROM (the latter implies read-only access).

    On Mon, 11 Jun 2012 17:25:15 +0200, Alan Stern <> wrote:
    > Does CD-ROM really imply read-only? If not, shouldn't it?

    It indeed does:

    curlun->ro = lcfg->cdrom || lcfg->ro;

    >> + - ro=b[,b...]
    >> +
    >> + This parameter specifies whether each logical unit should be
    >> + reported as read only. This will prevent host from modifying the
    >> + backing files.
    >> +
    >> + Note that if this flag for given logical unit is false but the
    >> + backing file could not be opened in read/write mode, the gadget
    >> + will fall back to read only mode anyway.
    >> +
    >> + The default value for each logical unit is false.
    > Shouldn't the default be true for logical units that are cdroms?

    Indeed. I've changed this last line to: The default value for non-CD-ROM
    logical units is false; for logical units simulating CD-ROM it is forced
    to true.

    > Very good. When you make the small changes listed above, you can add
    > Acked-by: Alan Stern <>

    I'll resend it tomorrow in case anyone else has any comments.

    Best regards, _ _
    .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
    ..o | Computer Science, Michał “mina86” Nazarewicz (o o)
    ooo +----<email/xmpp:>--------------ooO--(_)--Ooo--
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2012-06-11 19:02    [W:0.025 / U:75.360 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site