diff options
| author | Andy Shevchenko <[email protected]> | 2010-07-22 17:53:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2010-08-10 14:35:42 -0700 |
| commit | a93917d39fc388c4761d2530af82513e2d3bf9f6 (patch) | |
| tree | 0e2f7bed30b16c70a2f71951adfadeab7a29a4a8 /fs/jbd/commit.c | |
| parent | 8156d158efa6370a8183f47327f122edbb4f2cb6 (diff) | |
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 <[email protected]>
Acked-by: Alan Stern <[email protected]>
Cc: Denis Karpov <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: David Brownell <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'fs/jbd/commit.c')
0 files changed, 0 insertions, 0 deletions