WebOS Internals - User contributions [en]

Mounting Files and Devices as USB Mass Storage

2011-03-16T00:36:39Z

Error454: Added link to an open source node.js project that uses these details.

==Background==
Devices running WebOS use a usb mass storage driver written by Mike Lockwood in 2008. The driver source can be found in the following location in the source tree: 
linux-2.6.24/drivers/usb/gadget/f_mass_storage.c

This driver calls '''DEVICE_ATTR''' to create a file named "file" in sysfs. When the sysfs file entry is written to, the function '''store_file()''' is called within the driver. '''store_file()''' will mount the file or device that is passed in as an argument.

==Mounting Examples==
The following examples illustrate how to use this special file, you must be root since the "file" entry has permissions 644.

'''Mount /media/internal''' 
echo /dev/mapper/store-media > /sys/devices/platform/musb_hdrc.0/gadget/gadget-lun0/file

'''Create a 256 MB image and mount it''' 
dd if=/dev/zero of=/media/internal/test.img bs=1M count=256 
echo /media/internal/test.img > /sys/devices/platform/musb_hdrc.0/gadget/gadget-lun0/file 

==Applications==
There are numerous applications that could benefit from using this feature. Many game consoles write to generic fat16/32 partitions, unfortunately they typically want to format the entire partition for their use. Using this method, a game console CAN format the entire partition (2nd example above) without wiping out precious user data.

==Sample Service==
A node.js service for WebOS 2.x that implements the base functionality to mount user-specified files can be found [http://gitorious.org/usb-mass-storage-tools-service here]

Mounting Files and Devices as USB Mass Storage

2011-03-06T05:13:55Z

Error454: Fixed section header and grammar

Mounting Files and Devices as USB Mass Storage

2011-03-05T04:18:43Z

Error454:

= Mounting Files and Devices as USB Mass Storage =
==Background==
Devices running WebOS use a usb mass storage driver written by Mike Lockwood in 2008. The driver source can be found in the following location in the source tree: 
linux-2.6.24/drivers/usb/gadget/f_mass_storage.c

This driver calls '''DEVICE_ATTR''' to create a file named "file" in sysfs. When the sysfs entry is written to, the function '''store_file()''' is called within the driver. This function will mount the file or device that is passed in.

==Mounting Examples==
The following examples illustrate how to use this file, you must be root since the "file" entry has permissions 644.

'''Mount /media/internal''' 
echo /dev/mapper/store-media > /sys/devices/platform/musb_hdrc.0/gadget/gadget-lun0/file

'''Create a 256 MB image and mount it''' 
dd if=/dev/zero of=/media/internal/test.img bs=1M count=256 
echo /media/internal/test.img > /sys/devices/platform/musb_hdrc.0/gadget/gadget-lun0/file 

==Applications==
There are numerous applications that could benefit from using this feature. Many game consoles write to generic fat16/32 partitions, unfortunately they typically want to format the entire partition for their use. Using this method, a game console CAN format the entire partition (2nd example above) without wiping out the entire partition.

Mounting Files and Devices as USB Mass Storage

2011-03-05T04:17:00Z

Error454: initial page creation

= Mounting Files and Devices as USB Mass Storage =
==Background==
Devices running WebOS use a usb mass storage driver written by Mike Lockwood in 2008. The driver source can be found in the following location in the source tree: 
linux-2.6.24/drivers/usb/gadget/f_mass_storage.c

This driver calls '''DEVICE_ATTR''' to create a file named "file" in sysfs. When the sysfs entry is read, the function '''store_file()''' is called within the driver. This function will mount the file or device that is passed in.

==Mounting Examples==
The following examples illustrate how to use this file, you must be root since the "file" entry has permissions 644.

'''Mount /media/internal''' 
echo /dev/mapper/store-media > /sys/devices/platform/musb_hdrc.0/gadget/gadget-lun0/file

'''Create a 256 MB image and mount it''' 
dd if=/dev/zero of=/media/internal/test.img bs=1M count=256 
echo /media/internal/test.img > /sys/devices/platform/musb_hdrc.0/gadget/gadget-lun0/file 

==Applications==
There are numerous applications that could benefit from using this feature. Many game consoles write to generic fat16/32 partitions, unfortunately they typically want to format the entire partition for their use. Using this method, a game console CAN format the entire partition (2nd example above) without wiping out the entire partition.

Portal:Research

2011-03-05T03:38:21Z

Error454:

__notoc__
{{portal-header|
The Research Portal is for bleeding edge things being done with the device.

Title all pages: '''Research [description]''' or '''Reference [description]'''
}}
{{portal-two-columns
|column1=
===Research:===

* [[Applications Bundled on the Pre]]
* [[Application_Framework|Application Framework]]
* [[Application Signing|Application Signing]]
* [[Blocking Updates]]
* [[New Bluetooth|BlueZ (Replacing Palm Bluetooth)]]
* [[Bluetooth Network Connection]]
* [[Boot_Chain|Boot Chain]]
* [[Bootie]]
* [[Carrier Configuration]]
* [[ClassicFilesystem]]
* [[Decrypt SSL (trusted man-in-the-middle technique)|Decrypt SSL (trusted man-in-the-middle technique)]]
* [[Easter Eggs|Easter Eggs]]
* [[FirstUse Application Functionality]]
* [[Fonts available on board the Pre]]
* [[Gstreamer]]
* [[Hidd]]
* [[Introspecting_Dbus|Introspecting Dbus]]
* [[Key Codes|Key Codes]]
* [[Media API|Media API]]
* [[Mounting Files and Devices as USB Mass Storage]]
* [[Network Management|Network Management]]
* [[Advanced Wifi|Advanced Wireless LAN]]
* [[OpenGL|OpenGL research]]
* [[OpenGL_Triangle_of_Doom|OpenGL coding and demo Triangle of Doom]]
* [[Pre Specific Hash Codes|Pre Specific Hash Codes]]
* [[Research_Pre_Keyboard | Pre keyboard scancodes and keycodes]]
* [[Proximity Sensor]]
* [[Pictures from Self-Test|Pictures from Self-Test]]
* [[PmIpcDispatch|PmIpcDispatch to talk to palm IPC servers]]
* [[Restore Debug Log|Restore Debug Log]]
* [[Reverse_Engineering_WebOS_Doctor|Reverse Engineering WebOS Doctor]]
* [[Rooted Pre Issues|Rooted Pre Issues]]
* [[Research_Securing_Pre|Securing your Pre]]
* [[Running Processes|Running Processes]]
* [[Symlink Applications|Symlink Applications]]
* [[System Sounds|System Sounds]]
* [[TestApps|TestApps]]
* [[Facebook timezone issue|The annoying Facebook timezone issue]]
* [[Update Service Trace|Update Service Trace]]
* [[Tidbits|Tidbits]]
* [[VideoRecording]]
* [[WebOS Exploration - Various Information|WebOS Exploration - Various Information]]
* [[Research_Pre_GSM_Modem | Pre GSM modem device informations]]
* [[Research_Pre_GSM_Modem_Protocol | Pre GSM modem protocol informations]]
* [[Research_Pre_Audio | Audio routing and setup on the Pre]]
* [[Research_mpt | MSM modem passthru mode ]]
* [[Research_Pre_Boot_Process | Boot process]]
* [[LibSDL Research| SDL LibSDL research which lead to Quake and Doom running]]
* [[LibPDL Research| PDL LibPDL research ties into palm's device hooks]]
* [[Unofficial networks compatiblity list]]
* [[Research_kernel_Tuning | Research [kernel tuning]]]
* [[Touchscreen]]
* [[Java Support in webOS]]
* [[Chrooting | Methods of chrooting in webOS]]

|column2=
===Reference===
* [[Packaging Standards|Packaging Standards]]
* [[webkit_transform|Webkit Transform]]- a powerful set of commands for manipulating elements.
* [http://www.mobileforensicsworld.org/2010/presentations/MFW10_JHU_PalmPrePhoneForensics.pdf webOS Forensics Using the Palm Pre Plus] : a lot of useful informations on webOS.

}}