Commit 7209300a authored by Sunil Mushran's avatar Sunil Mushran Committed by Mark Fasheh
Browse files

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

fs/ocfs2/dlm/dlmdebug.c

+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)

fs/ocfs2/dlm/dlmdebug.h

+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 {