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authorTejun Heo <tj@kernel.org>2008-08-25 10:47:25 (GMT)
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 06:56:06 (GMT)
commit870d6656126add8e383645732b03df2b7ccd4f94 (patch)
tree9c33dd91350ea163b160d9f5cb40d913c5caf268 /drivers/ide
parentf615b48cc7df7cac3865ec76ac1a5bb04d3e07f4 (diff)
downloadlinux-870d6656126add8e383645732b03df2b7ccd4f94.tar.xz
block: implement CONFIG_DEBUG_BLOCK_EXT_DEVT
Extended devt introduces non-contiguos device numbers. This patch implements a debug option which forces most devt allocations to be from the extended area and spreads them out. This is enabled by default if DEBUG_KERNEL is set and achieves... 1. Detects code paths in kernel or userland which expect predetermined consecutive device numbers. 2. When something goes wrong, avoid corruption as adding to the minor of earlier partition won't lead to the wrong but valid device. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-disk.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 7a88de9..a072df5 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -42,7 +42,13 @@
#include <asm/div64.h>
#define IDE_DISK_PARTS (1 << PARTN_BITS)
+
+#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
#define IDE_DISK_MINORS IDE_DISK_PARTS
+#else
+#define IDE_DISK_MINORS 1
+#endif
+
#define IDE_DISK_EXT_MINORS (IDE_DISK_PARTS - IDE_DISK_MINORS)
struct ide_disk_obj {