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author | Sunil Mushran <sunil.mushran@oracle.com> | 2009-11-18 00:29:19 (GMT) |
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committer | Joel Becker <joel.becker@oracle.com> | 2009-12-03 00:49:26 (GMT) |
commit | f6656d26d17b2598f43cd41be088853fa2a03397 (patch) | |
tree | 5fdf95fdfab4302e28d9f00cf89ea4785ea9325c /fs/ocfs2/cluster/nodemanager.c | |
parent | 57b09bb5e492c37c1e4273fe4e435ffd1d2ddbe0 (diff) | |
download | linux-fsl-qoriq-f6656d26d17b2598f43cd41be088853fa2a03397.tar.xz |
ocfs2/cluster: Make fence method configurable - v2
By default, o2cb fences the box by calling emergency_restart(). While this
scheme works well in production, it comes in the way during testing as it
does not let the tester take stack/core dumps for analysis.
This patch allows user to dynamically change the fence method to panic() by:
# echo "panic" > /sys/kernel/config/cluster/<clustername>/fence_method
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/cluster/nodemanager.c')
-rw-r--r-- | fs/ocfs2/cluster/nodemanager.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/ocfs2/cluster/nodemanager.c b/fs/ocfs2/cluster/nodemanager.c index 7ee6188..c81142e 100644 --- a/fs/ocfs2/cluster/nodemanager.c +++ b/fs/ocfs2/cluster/nodemanager.c @@ -35,6 +35,10 @@ * cluster references throughout where nodes are looked up */ struct o2nm_cluster *o2nm_single_cluster = NULL; +char *o2nm_fence_method_desc[O2NM_FENCE_METHODS] = { + "reset", /* O2NM_FENCE_RESET */ + "panic", /* O2NM_FENCE_PANIC */ +}; struct o2nm_node *o2nm_get_node_by_num(u8 node_num) { @@ -579,6 +583,43 @@ static ssize_t o2nm_cluster_attr_reconnect_delay_ms_write( return o2nm_cluster_attr_write(page, count, &cluster->cl_reconnect_delay_ms); } + +static ssize_t o2nm_cluster_attr_fence_method_read( + struct o2nm_cluster *cluster, char *page) +{ + ssize_t ret = 0; + + if (cluster) + ret = sprintf(page, "%s\n", + o2nm_fence_method_desc[cluster->cl_fence_method]); + return ret; +} + +static ssize_t o2nm_cluster_attr_fence_method_write( + struct o2nm_cluster *cluster, const char *page, size_t count) +{ + unsigned int i; + + if (page[count - 1] != '\n') + goto bail; + + for (i = 0; i < O2NM_FENCE_METHODS; ++i) { + if (count != strlen(o2nm_fence_method_desc[i]) + 1) + continue; + if (strncasecmp(page, o2nm_fence_method_desc[i], count - 1)) + continue; + if (cluster->cl_fence_method != i) { + printk(KERN_INFO "ocfs2: Changing fence method to %s\n", + o2nm_fence_method_desc[i]); + cluster->cl_fence_method = i; + } + return count; + } + +bail: + return -EINVAL; +} + static struct o2nm_cluster_attribute o2nm_cluster_attr_idle_timeout_ms = { .attr = { .ca_owner = THIS_MODULE, .ca_name = "idle_timeout_ms", @@ -603,10 +644,19 @@ static struct o2nm_cluster_attribute o2nm_cluster_attr_reconnect_delay_ms = { .store = o2nm_cluster_attr_reconnect_delay_ms_write, }; +static struct o2nm_cluster_attribute o2nm_cluster_attr_fence_method = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "fence_method", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = o2nm_cluster_attr_fence_method_read, + .store = o2nm_cluster_attr_fence_method_write, +}; + static struct configfs_attribute *o2nm_cluster_attrs[] = { &o2nm_cluster_attr_idle_timeout_ms.attr, &o2nm_cluster_attr_keepalive_delay_ms.attr, &o2nm_cluster_attr_reconnect_delay_ms.attr, + &o2nm_cluster_attr_fence_method.attr, NULL, }; static ssize_t o2nm_cluster_show(struct config_item *item, @@ -778,6 +828,7 @@ static struct config_group *o2nm_cluster_group_make_group(struct config_group *g cluster->cl_reconnect_delay_ms = O2NET_RECONNECT_DELAY_MS_DEFAULT; cluster->cl_idle_timeout_ms = O2NET_IDLE_TIMEOUT_MS_DEFAULT; cluster->cl_keepalive_delay_ms = O2NET_KEEPALIVE_DELAY_MS_DEFAULT; + cluster->cl_fence_method = O2NM_FENCE_RESET; ret = &cluster->cl_group; o2nm_single_cluster = cluster; |