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ocfs2: add dlm_recover_callback_support in sysfs 

This is a part of the nocontrold feature which was incorporated sometime
back.

This is required for backward compatibility of the tools, specifically
the scenario where the tools with recovery callback is used with a
kernel not using the recovery callbacks (older kernel + newer tools).
The tools look for this file to understand if the kernel supports DLM
recovery callbacks.

For kernels which support recovery callbacks but will miss this patch,
ocfs2 will continue to use the older API and would still be able to
mount the filesystem.

[akpm@linux-foundation.org: simplify]
[sfr@canb.auug.org.au: VERIFY_OCTAL_PERMISSIONS fix up]
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Goldwyn Rodrigues 2014-04-03 14:46:52 -07:00 committed by Linus Torvalds
parent ded2cf7141
commit 765aabbbc7
1 changed files with 14 additions and 0 deletions
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14
fs/ocfs2/stackglue.c
View File

@ -603,11 +603,25 @@ static struct kobj_attribute ocfs2_attr_cluster_stack =
ocfs2_cluster_stack_show,
ocfs2_cluster_stack_store);
static ssize_t ocfs2_dlm_recover_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "1\n");
}
static struct kobj_attribute ocfs2_attr_dlm_recover_support =
__ATTR(dlm_recover_callback_support, S_IRUGO,
ocfs2_dlm_recover_show, NULL);
static struct attribute *ocfs2_attrs[] = {
&ocfs2_attr_max_locking_protocol.attr,
&ocfs2_attr_loaded_cluster_plugins.attr,
&ocfs2_attr_active_cluster_plugin.attr,
&ocfs2_attr_cluster_stack.attr,
&ocfs2_attr_dlm_recover_support.attr,
NULL,
};