From 73285082745045bcd64333c1fbaa88f8490f2626 Mon Sep 17 00:00:00 2001 From: Ken Chen Date: Tue, 8 May 2007 00:28:20 -0700 Subject: remove artificial software max_loop limit Remove artificial maximum 256 loop device that can be created due to a legacy device number limit. Searching through lkml archive, there are several instances where users complained about the artificial limit that the loop driver impose. There is no reason to have such limit. This patch rid the limit entirely and make loop device and associated block queue instantiation on demand. With on-demand instantiation, it also gives the benefit of not wasting memory if these devices are not in use (compare to current implementation that always create 8 loop devices), a net improvement in both areas. This version is both tested with creation of large number of loop devices and is compatible with existing losetup/mount user land tools. There are a number of people who worked on this and provided valuable suggestions, in no particular order, by: Jens Axboe Jan Engelhardt Christoph Hellwig Thomas M Signed-off-by: Ken Chen Cc: Jan Engelhardt Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/loop.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/loop.h') diff --git a/include/linux/loop.h b/include/linux/loop.h index 191a595055f0..0b99b31f017b 100644 --- a/include/linux/loop.h +++ b/include/linux/loop.h @@ -64,6 +64,8 @@ struct loop_device { wait_queue_head_t lo_event; request_queue_t *lo_queue; + struct gendisk *lo_disk; + struct list_head lo_list; }; #endif /* __KERNEL__ */ -- cgit v1.2.3