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: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index 6de326b..a109005 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -303,6 +303,7 @@
#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 @@
}
/* 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 @@
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 @@
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)
diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h
index cbc69f2..8857743 100644
--- a/fs/ocfs2/dlm/dlmdebug.h
+++ b/fs/ocfs2/dlm/dlmdebug.h
@@ -32,6 +32,7 @@
struct dentry *debug_state_dentry;
struct dentry *debug_lockres_dentry;
struct dentry *debug_mle_dentry;
+ struct dentry *debug_purgelist_dentry;
};
struct debug_buffer {