mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 14:53:58 -04:00
421c8d9a20
It allows to reset prevent_medium_removal flag and "eject" the image. This can be useful to free the drive from a hunging host or if the host continues to use the drive even after unmounting (Linux does this). It's also a bit like using an unfolded paperclip on an optical drive. Previously, the undocumented method of sending SIGUSR1 to a special "file-storage" kernel thread could be used for these purposes, but when using multiple storages there was no way to distinguish one from the other, so we had to send a signal to everyone. Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Maxim Devaev <mdevaev@gmail.com> Link: https://lore.kernel.org/r/20220711102956.19642-1-mdevaev@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
42 lines
1.5 KiB
Plaintext
42 lines
1.5 KiB
Plaintext
What: /config/usb-gadget/gadget/functions/mass_storage.name
|
|
Date: Oct 2013
|
|
KernelVersion: 3.13
|
|
Description:
|
|
The attributes:
|
|
|
|
=========== ==============================================
|
|
stall Set to permit function to halt bulk endpoints.
|
|
Disabled on some USB devices known not to work
|
|
correctly. You should set it to true.
|
|
num_buffers Number of pipeline buffers. Valid numbers
|
|
are 2..4. Available only if
|
|
CONFIG_USB_GADGET_DEBUG_FILES is set.
|
|
=========== ==============================================
|
|
|
|
What: /config/usb-gadget/gadget/functions/mass_storage.name/lun.name
|
|
Date: Oct 2013
|
|
KernelVersion: 3.13
|
|
Description:
|
|
The attributes:
|
|
|
|
=========== ==============================================
|
|
file The path to the backing file for the LUN.
|
|
Required if LUN is not marked as removable.
|
|
ro Flag specifying access to the LUN shall be
|
|
read-only. This is implied if CD-ROM emulation
|
|
is enabled as well as when it was impossible
|
|
to open "filename" in R/W mode.
|
|
removable Flag specifying that LUN shall be indicated as
|
|
being removable.
|
|
cdrom Flag specifying that LUN shall be reported as
|
|
being a CD-ROM.
|
|
nofua Flag specifying that FUA flag
|
|
in SCSI WRITE(10,12)
|
|
forced_eject This write-only file is useful only when
|
|
the function is active. It causes the backing
|
|
file to be forcibly detached from the LUN,
|
|
regardless of whether the host has allowed it.
|
|
Any non-zero number of bytes written will
|
|
result in ejection.
|
|
=========== ==============================================
|