Messages in this thread |  | | Date | Mon, 12 Feb 2001 09:16:02 -0800 | From | LA Walsh <> | Subject | Block driver design issue |
| |
I have a block driver I inherited that I working on that has a problem and was wondering for cleaner solutions.
The driver can accept written characters from either userspace programs or from the kernel. From userspace it uses sys_write. That in turn calls block_write. There's almost 100 lines of duplicated code in a copy of the block_write code in the driver "block_writek" as well as duplicate code in audit_write vs. audit_writek. The only difference being down in block_write at the "copy_from_user(p,buf,chars); " which becomes a "memcpy(p,buf,chars)" in the "block_writek" version.
I find this duplication of code to be inefficient. Is there a way to dummy up the the 'buf' address so that the "copy_from_user" will copy the buffer from kernel space? My assumption is that it wouldn't "just work" (which may also be an invalid assumption).
Suggestions? Abuse?
Thanks! -linda
-- L A Walsh | Trust Technology, Core Linux, SGI law@sgi.com | Voice: (650) 933-5338 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://vger.kernel.org/lkml/
|  |