The reason nodes are fenced during network failures is because we need
to guarantee that no i/o's are going to happen from this fenced node. If
you just change the fs to read-only we still cannot guarantee that there
are no inflight-io's from this node from previous writes.
On 05/31/2013 08:33 AM, Vineeth Thampi wrote:
Hi,
I have been working around the issue of Node fence in case of a
heartbeat failure / Network timeout. I modified o2quo_fence_self() in
quorum.c to make all ocfs2 filesystems RO, when tested it worked like
a charm, and the filesystems were made RO, but I am not able to umount
the filesystem or stop O2CB service.
Is there any way by which I could ask O2CB to abort heartbeat and
treat the filesystem as LOCAL instead of GLOBAL?
The following is the code change that I made.
**************************************************
static void make_fs_RO(struct super_block *sb, void *arg)
{
struct ocfs2_super *osb = OCFS2_SB(sb);
sb->s_flags |= MS_RDONLY;
ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
ocfs2_set_ro_flag(osb, *(int *)arg);
}
/* this is horribly heavy-handed. It should instead flip the file
* system RO and call some userspace script. */
static void o2quo_fence_self(void)
{
*...*
case O2NM_FENCE_RESET:
printk(KERN_ERR "*** Hard failure in O2CB, all ocfs2 "
"filesystems made RO ***\n");
/* Iterate through all ocfs2 super blocks and make
each of
them RO */
fs_type = get_fs_type("ocfs2");
if (fs_type)
iterate_supers_type(fs_type, make_fs_RO,
&hard_reset);
break;
*...*
}
***************************************************************
The error from kern.log:
=======================================
May 31 16:08:18 localhost kernel: [ 5434.076126]
(kworker/u:2,577,3):dlm_send_remote_convert_request:395 ERROR: Error
-107 when sending message 504 (key 0xcfe4a084) to node 0
May 31 16:08:18 localhost kernel: [ 5434.076178] o2dlm: Waiting on the
death of node 0 in domain A4E98618A3744717A65AF04E943D035A
=======================================
Any pointers would be much appreciated.
Thanks,
Vineeth
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