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authorMikulas Patocka <mpatocka@redhat.com>2013-03-02 02:45:49 +0400
committerAlasdair G Kergon <agk@redhat.com>2013-03-02 02:45:49 +0400
commit02cde50b7ea74557d32ff778c73809322445ccd2 (patch)
tree5021be59504bc5dc3e4fb247debcbb9a383b0dab /include
parente2914cc26bbca67fd30fff02c6777e8477fc8a6a (diff)
downloadlinux-02cde50b7ea74557d32ff778c73809322445ccd2.tar.xz
dm ioctl: optimize functions without variable params
Device-mapper ioctls receive and send data in a buffer supplied by userspace. The buffer has two parts. The first part contains a 'struct dm_ioctl' and has a fixed size. The second part depends on the ioctl and has a variable size. This patch recognises the specific ioctls that do not use the variable part of the buffer and skips allocating memory for it. In particular, when a device is suspended and a resume ioctl is sent, this now avoid memory allocation completely. The variable "struct dm_ioctl tmp" is moved from the function copy_params to its caller ctl_ioctl and renamed to param_kernel. It is used directly when the ioctl function doesn't need any arguments. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/uapi/linux/dm-ioctl.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index 539b179b349c..b8a6bddf0727 100644
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 23
-#define DM_VERSION_PATCHLEVEL 1
-#define DM_VERSION_EXTRA "-ioctl (2012-12-18)"
+#define DM_VERSION_MINOR 24
+#define DM_VERSION_PATCHLEVEL 0
+#define DM_VERSION_EXTRA "-ioctl (2013-01-15)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */