Messages in this thread Patch in this message | | | Date | Mon, 06 Jun 2005 13:39:10 +0200 | From | Jan Blunck <> | Subject | [PATCH] don't allow sys_readahead() on files opened with O_DIRECT |
| |
do_readahead() doesn't make sense if the file is opened with O_DIRECT, since only the page cache is stuffed but never used.
Signed-off-by: Jan Blunck <j.blunck@tu-harburg.de>
mm/filemap.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletion(-)
Index: experimental-um/mm/filemap.c =================================================================== --- experimental-um.orig/mm/filemap.c +++ experimental-um/mm/filemap.c @@ -1110,7 +1110,8 @@ static ssize_t do_readahead(struct address_space *mapping, struct file *filp, unsigned long index, unsigned long nr) { - if (!mapping || !mapping->a_ops || !mapping->a_ops->readpage) + if (!mapping || !mapping->a_ops || !mapping->a_ops->readpage + || mapping->a_ops->direct_IO) return -EINVAL; force_page_cache_readahead(mapping, filp, index, | |