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| author | Jens Axboe <jens.axboe@oracle.com> | 2010-05-19 21:03:16 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-05-21 21:12:52 +0200 |
| commit | b492e95be0ae672922f4734acf3f5d35c30be948 (patch) | |
| tree | a8a1e7f035903796e6b8f626add8d269bf989a35 /include/linux/pipe_fs_i.h | |
| parent | 35f3d14dbbc58447c61e38a162ea10add6b31dc7 (diff) | |
| download | lwn-b492e95be0ae672922f4734acf3f5d35c30be948.tar.gz lwn-b492e95be0ae672922f4734acf3f5d35c30be948.zip | |
pipe: set lower and upper limit on max pages in the pipe page array
We need at least two to guarantee proper POSIX behaviour, so
never allow a smaller limit than that.
Also expose a /proc/sys/fs/pipe-max-pages sysctl file that allows
root to define a sane upper limit. Make it default to 16 times the
default size, which is 16 pages.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/pipe_fs_i.h')
| -rw-r--r-- | include/linux/pipe_fs_i.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index 65f4282fcbaf..16de3933c45e 100644 --- a/include/linux/pipe_fs_i.h +++ b/include/linux/pipe_fs_i.h @@ -139,6 +139,8 @@ void pipe_lock(struct pipe_inode_info *); void pipe_unlock(struct pipe_inode_info *); void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *); +extern unsigned int pipe_max_pages; + /* Drop the inode semaphore and wait for a pipe event, atomically */ void pipe_wait(struct pipe_inode_info *pipe); |