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pipe: adjust minimum pipe size to 1 page 

We don't need to pages to guarantee the POSIX requirement
that upto a page size write must be atomic to an empty
pipe.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Jens Axboe 2010-06-03 12:44:30 +02:00
parent b4ca761577
commit 6a6ca57de9
1 changed files with 1 additions and 7 deletions
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8
fs/pipe.c
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@ -1181,13 +1181,7 @@ long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
if (!capable(CAP_SYS_ADMIN) && nr_pages > pipe_max_pages) { if (!capable(CAP_SYS_ADMIN) && nr_pages > pipe_max_pages) {
ret = -EPERM; ret = -EPERM;
goto out; goto out;
} } else if (nr_pages < 1) {
/*
* The pipe needs to be at least 2 pages large to
* guarantee POSIX behaviour.
*/
if (arg < 2) {
ret = -EINVAL; ret = -EINVAL;
goto out; goto out;
} }