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Andy Shevchenko a93917d39f USB: gadget: storage: optional SCSI WRITE FUA bit 
MS Windows mounts removable storage in "Removal optimized mode" by
default. All the writes to the media are synchronous which is achieved
by setting FUA (Force Unit Access) bit in SCSI WRITE(10,12) commands.
This prevents I/O requests aggregation in block layer dramatically
decreasing performance.

This patch brings an option to accept or ignore mentioned bit
 a) via specifying module parameter "nofua", or
 b) through sysfs entry
	/sys/devices/platform/_UDC_/gadget/gadget-lunX/nofua
	(_UDC_ is the name of the USB Device Controller driver)

Patch is based on the work that was done by Denis Karpov for Maemo 5
platform.

Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Denis Karpov <ext-denis.2.karpov@nokia.com>
Cc: Adrian Hunter <adrian.hunter@nokia.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-10 14:35:42 -07:00
..
debugfs-ec Documentation: Add new /sys/kernel/debug/ec/* files to ABI 2010-08-03 09:49:07 -04:00
debugfs-pktcdvd doc: use correct debugfs mountpoint 2009-04-13 15:04:33 -07:00
ima_policy ima: rename PATH_CHECK to FILE_CHECK 2010-02-07 03:06:23 -05:00
procfs-diskstats tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
sysfs-block block: Added in stricter no merge semantics for block I/O 2010-01-29 09:04:08 +01:00
sysfs-bus-css [S390] cio: Introduce modalias for css bus. 2008-07-14 10:02:05 +02:00
sysfs-bus-i2c-devices-hm6352 hmc6352: add driver for the HMC6352 compass 2010-08-09 20:45:10 -07:00
sysfs-bus-pci PCI: export SMBIOS provided firmware instance and label to sysfs 2010-07-30 09:36:01 -07:00
sysfs-bus-pci-devices-cciss cciss: Add usage_count attribute to each logical drive in /sys 2009-10-01 21:15:44 +02:00
sysfs-bus-umc uwb: document UWB and WUSB sysfs files 2008-09-17 16:54:35 +01:00
sysfs-bus-usb USB: deprecate the power/level sysfs attribute 2010-05-20 13:21:37 -07:00
sysfs-bus-usb-devices-usbsevseg USB: Added driver for a Delcom USB 7-segment LED Display 2008-10-17 14:40:51 -07:00
sysfs-c2port Add c2 port support 2008-11-12 17:17:18 -08:00
sysfs-class
sysfs-class-bdi fuse: fix bdi naming conflict 2008-05-24 09:56:07 -07:00
sysfs-class-lcd video/lcd: document sysfs interface 2009-08-28 15:21:12 -04:00
sysfs-class-led led: document sysfs interface 2009-08-28 15:21:12 -04:00
sysfs-class-mtd Documentation: add MTD sysfs docs 2009-05-29 15:13:04 +01:00
sysfs-class-pktcdvd
sysfs-class-power ds2760_battery: Document ABI change 2010-05-19 12:25:39 +04:00
sysfs-class-regulator regulator: add get_status() 2009-03-31 09:56:20 +01:00
sysfs-class-uwb_rc uwb: add basic radio manager 2008-11-19 14:46:33 +00:00
sysfs-class-uwb_rc-wusbhc USB: wusb: add wusb_phy_rate sysfs file to host controllers 2009-12-11 11:55:16 -08:00
sysfs-dev sysfs: add /sys/dev/{char,block} to lookup sysfs path by major:minor 2008-07-21 21:54:40 -07:00
sysfs-devices
sysfs-devices-memory Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
sysfs-devices-node mm: compaction: add /sys trigger for per-node memory compaction 2010-05-25 08:06:59 -07:00
sysfs-devices-platform-_UDC_-gadget USB: gadget: storage: optional SCSI WRITE FUA bit 2010-08-10 14:35:42 -07:00
sysfs-devices-power PM: Add facility for advanced testing of async suspend/resume 2010-02-26 20:39:10 +01:00
sysfs-devices-system-cpu Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
sysfs-driver-hid-picolcd HID: split picolcd's operation_mode sysfs attribute 2010-04-27 15:31:26 +02:00
sysfs-driver-hid-prodikeys HID: Prodikeys PC-MIDI HID Driver 2010-05-12 15:18:59 +02:00
sysfs-driver-hid-roccat-kone HID: roccat: remove obsolete kone_abi_version sysfs attribute 2010-06-21 15:20:35 +02:00
sysfs-firmware-acpi ACPI: add /sys/firmware/acpi/interrupts/sci_not counter 2009-04-21 00:35:47 -04:00
sysfs-firmware-memmap Bernhard has moved 2009-02-18 15:37:56 -08:00
sysfs-firmware-sfi SFI: add sysfs interface for SFI tables. 2010-05-27 12:46:20 -04:00
sysfs-firmware-sgi_uv sysfs: document files in /sys/firmware/sgi_uv/ 2008-09-02 19:21:40 -07:00
sysfs-fs-ext4 ext4: teach the inode allocator to use a goal inode number 2009-06-13 11:45:35 -04:00
sysfs-gpio gpiolib: allow poll() on value 2009-09-23 07:39:48 -07:00
sysfs-i2c-bmp085 drivers/misc: support for the pressure sensor BMP085 from Bosch Sensortec 2010-08-09 20:45:05 -07:00
sysfs-ibft Firmware: add iSCSI iBFT Support 2008-04-19 19:10:28 -07:00
sysfs-kernel-mm mm: create /sys/kernel/mm 2008-07-24 10:47:17 -07:00
sysfs-kernel-mm-hugepages hugetlb: new sysfs interface 2008-07-24 10:47:17 -07:00
sysfs-kernel-slab slub: allow stats to be cleared 2009-10-15 21:34:12 +03:00
sysfs-kernel-uids
sysfs-memory-page-offline HWPOISON: Add soft page offline support 2009-12-16 12:20:00 +01:00
sysfs-ocfs2 ocfs2: Document /sys/fs/ocfs2 2008-04-18 08:56:07 -07:00
sysfs-platform-asus-laptop asus-laptop: set the right paths in the documentation 2010-02-28 19:35:09 +01:00
sysfs-platform-eeepc-laptop eeepc-laptop: set the right paths in the documentation 2010-02-28 19:30:57 +01:00
sysfs-power PM: Make it possible to avoid races between wakeup and system sleep 2010-07-19 01:58:48 +02:00
sysfs-pps LinuxPPS: core support 2009-06-18 13:04:04 -07:00
sysfs-profiling profiling: dynamically enable readprofile at runtime 2008-10-16 11:21:31 -07:00
sysfs-wacom HID: wacom: add ABI doc entry for speed attribute 2010-04-23 02:14:10 +02:00
sysfs-wusb_cbaf uwb: document UWB and WUSB sysfs files 2008-09-17 16:54:35 +01:00