From 95d402f057f2e208e4631893f6cd4a59c7c05e41 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Mon, 31 Oct 2011 20:19:09 +0000 Subject: dm: add bufio The dm-bufio interface allows you to do cached I/O on devices, holding recently-read blocks in memory and performing delayed writes. We don't use buffer cache or page cache already present in the kernel, because: * we need to handle block sizes larger than a page * we can't allocate memory to perform reads or we'd have deadlocks Currently, when a cache is required, we limit its size to a fraction of available memory. Usage can be viewed and changed in /sys/module/dm_bufio/parameters/ . The first user is thin provisioning, but more dm users are planned. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/md/Makefile') diff --git a/drivers/md/Makefile b/drivers/md/Makefile index 448838b1f92a..56661c4272f2 100644 --- a/drivers/md/Makefile +++ b/drivers/md/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_MD_MULTIPATH) += multipath.o obj-$(CONFIG_MD_FAULTY) += faulty.o obj-$(CONFIG_BLK_DEV_MD) += md-mod.o obj-$(CONFIG_BLK_DEV_DM) += dm-mod.o +obj-$(CONFIG_DM_BUFIO) += dm-bufio.o obj-$(CONFIG_DM_CRYPT) += dm-crypt.o obj-$(CONFIG_DM_DELAY) += dm-delay.o obj-$(CONFIG_DM_FLAKEY) += dm-flakey.o -- cgit v1.2.3