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From: jbrassow@sourceware.org To: lvm-devel@redhat.com, lvm2-cvs@sourceware.org Subject: LVM2/libdm/misc dm-log-userspace.h Date: Fri, 14 Oct 2011 14:04:00 -0000 [thread overview] Message-ID: <20111014140406.28798.qmail@sourceware.org> (raw) CVSROOT: /cvs/lvm2 Module name: LVM2 Changes by: jbrassow@sourceware.org 2011-10-14 14:04:06 Modified files: libdm/misc : dm-log-userspace.h Log message: Update stale libdm/misc/dm-log-userspace.h The upstream kernel version that this file mirrors has changed, here is the commit message: commit 86a54a4802df10d23ccd655e2083e812fe990243 Author: Jonathan Brassow <jbrassow@redhat.com> Date: Thu Jan 13 19:59:52 2011 +0000 dm log userspace: add version number to comms This patch adds a 'version' field to the 'dm_ulog_request' structure. The 'version' field is taken from a portion of the unused 'padding' field in the 'dm_ulog_request' structure. This was done to avoid changing the size of the structure and possibly disrupting backwards compatibility. The version number will help notify user-space daemons when a change has been made to the kernel/userspace log API. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/misc/dm-log-userspace.h.diff?cvsroot=lvm2&r1=1.3&r2=1.4 --- LVM2/libdm/misc/dm-log-userspace.h 2010/06/22 13:11:32 1.3 +++ LVM2/libdm/misc/dm-log-userspace.h 2011/10/14 14:04:05 1.4 @@ -363,13 +363,23 @@ * various request types above. The remaining 24-bits are currently * set to zero and are reserved for future use and compatibility concerns. * - * User-space should always use DM_ULOG_REQUEST_TYPE to aquire the + * User-space should always use DM_ULOG_REQUEST_TYPE to acquire the * request type from the 'request_type' field to maintain forward compatibility. */ #define DM_ULOG_REQUEST_MASK 0xFF #define DM_ULOG_REQUEST_TYPE(request_type) \ (DM_ULOG_REQUEST_MASK & (request_type)) +/* + * DM_ULOG_REQUEST_VERSION is incremented when there is a + * change to the way information is passed between kernel + * and userspace. This could be a structure change of + * dm_ulog_request or a change in the way requests are + * issued/handled. Changes are outlined here: + * version 1: Initial implementation + */ +#define DM_ULOG_REQUEST_VERSION 1 + struct dm_ulog_request { /* * The local unique identifier (luid) and the universally unique @@ -383,8 +393,9 @@ */ uint64_t luid; char uuid[DM_UUID_LEN]; - char padding[7]; /* Padding because DM_UUID_LEN = 129 */ + char padding[3]; /* Padding because DM_UUID_LEN = 129 */ + uint32_t version; /* See DM_ULOG_REQUEST_VERSION */ int32_t error; /* Used to report back processing errors */ uint32_t seq; /* Sequence number for request */
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