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author | Reinette Chatre <reinette.chatre@linux.intel.com> | 2006-10-11 01:21:55 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-11 11:14:22 -0700 |
commit | 01a3ee2b203e511e20f98b85a9172fd32c53e87c (patch) | |
tree | 0dd90d81dc86f231828af23bdb97522405b06cab /fs/befs/super.h | |
parent | 39484e53bb00f55b6303a908070db133608ef2a5 (diff) | |
download | linux-01a3ee2b203e511e20f98b85a9172fd32c53e87c.tar.gz linux-01a3ee2b203e511e20f98b85a9172fd32c53e87c.tar.bz2 linux-01a3ee2b203e511e20f98b85a9172fd32c53e87c.zip |
[PATCH] bitmap: parse input from kernel and user buffers
lib/bitmap.c:bitmap_parse() is a library function that received as input a
user buffer. This seemed to have originated from the way the write_proc
function of the /proc filesystem operates.
This has been reworked to not use kmalloc and eliminates a lot of
get_user() overhead by performing one access_ok before using __get_user().
We need to test if we are in kernel or user space (is_user) and access the
buffer differently. We cannot use __get_user() to access kernel addresses
in all cases, for example in architectures with separate address space for
kernel and user.
This function will be useful for other uses as well; for example, taking
input for /sysfs instead of /proc, so it was changed to accept kernel
buffers. We have this use for the Linux UWB project, as part as the
upcoming bandwidth allocator code.
Only a few routines used this function and they were changed too.
Signed-off-by: Reinette Chatre <reinette.chatre@linux.intel.com>
Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/befs/super.h')
0 files changed, 0 insertions, 0 deletions