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Commit 7209300a authored by Sunil Mushran's avatar Sunil Mushran Committed by Mark Fasheh
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ocfs2/dlm: Dumps the purgelist into a debugfs file



This patch dumps all the lockres' on the purgelist it can fit in one page
into a debugfs file. Useful for debugging.

Signed-off-by: default avatarSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent d0129ace
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+71 −0
Original line number Diff line number Diff line
@@ -303,6 +303,7 @@ static int stringify_lockname(const char *lockname, int locklen,
#define DLM_DEBUGFS_DLM_STATE			"dlm_state"
#define DLM_DEBUGFS_LOCKING_STATE		"locking_state"
#define DLM_DEBUGFS_MLE_STATE			"mle_state"
#define DLM_DEBUGFS_PURGE_LIST			"purge_list"

/* begin - utils funcs */
static void dlm_debug_free(struct kref *kref)
@@ -396,6 +397,63 @@ static int debug_buffer_release(struct inode *inode, struct file *file)
}
/* end - util funcs */

/* begin - purge list funcs */
static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
{
	struct dlm_lock_resource *res;
	int out = 0;
	unsigned long total = 0;

	out += snprintf(db->buf + out, db->len - out,
			"Dumping Purgelist for Domain: %s\n", dlm->name);

	spin_lock(&dlm->spinlock);
	list_for_each_entry(res, &dlm->purge_list, purge) {
		++total;
		if (db->len - out < 100)
			continue;
		spin_lock(&res->spinlock);
		out += stringify_lockname(res->lockname.name,
					  res->lockname.len,
					  db->buf + out, db->len - out);
		out += snprintf(db->buf + out, db->len - out, "\t%ld\n",
				(jiffies - res->last_used)/HZ);
		spin_unlock(&res->spinlock);
	}
	spin_unlock(&dlm->spinlock);

	out += snprintf(db->buf + out, db->len - out,
			"Total on list: %ld\n", total);

	return out;
}

static int debug_purgelist_open(struct inode *inode, struct file *file)
{
	struct dlm_ctxt *dlm = inode->i_private;
	struct debug_buffer *db;

	db = debug_buffer_allocate();
	if (!db)
		goto bail;

	db->len = debug_purgelist_print(dlm, db);

	file->private_data = db;

	return 0;
bail:
	return -ENOMEM;
}

static struct file_operations debug_purgelist_fops = {
	.open =		debug_purgelist_open,
	.release =	debug_buffer_release,
	.read =		debug_buffer_read,
	.llseek =	debug_buffer_llseek,
};
/* end - purge list funcs */

/* begin - debug mle funcs */
static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
{
@@ -906,6 +964,17 @@ int dlm_debug_init(struct dlm_ctxt *dlm)
		goto bail;
	}

	/* for dumping lockres on the purge list */
	dc->debug_purgelist_dentry =
			debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
					    S_IFREG|S_IRUSR,
					    dlm->dlm_debugfs_subroot,
					    dlm, &debug_purgelist_fops);
	if (!dc->debug_purgelist_dentry) {
		mlog_errno(-ENOMEM);
		goto bail;
	}

	dlm_debug_get(dc);
	return 0;

@@ -919,6 +988,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm)
	struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;

	if (dc) {
		if (dc->debug_purgelist_dentry)
			debugfs_remove(dc->debug_purgelist_dentry);
		if (dc->debug_mle_dentry)
			debugfs_remove(dc->debug_mle_dentry);
		if (dc->debug_lockres_dentry)
+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ struct dlm_debug_ctxt {
	struct dentry *debug_state_dentry;
	struct dentry *debug_lockres_dentry;
	struct dentry *debug_mle_dentry;
	struct dentry *debug_purgelist_dentry;
};

struct debug_buffer {