[PATCH] OCFS2: The Second Oracle Cluster Filesystem

Very simple printk wrapper which adds the ability to enable various
sets of debug messages at run-time.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>

1 files changed, 166 insertions, 0 deletions

diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c
new file mode 100644
index 000000000000..fd741cea5705
--- /dev/null
+++ b/fs/ocfs2/cluster/masklog.c
@@ -0,0 +1,166 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * Copyright (C) 2004, 2005 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <asm/uaccess.h>
+
+#include "masklog.h"
+
+struct mlog_bits mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
+EXPORT_SYMBOL_GPL(mlog_and_bits);
+struct mlog_bits mlog_not_bits = MLOG_BITS_RHS(MLOG_INITIAL_NOT_MASK);
+EXPORT_SYMBOL_GPL(mlog_not_bits);
+
+static ssize_t mlog_mask_show(u64 mask, char *buf)
+{
+        char *state;
+
+        if (__mlog_test_u64(mask, mlog_and_bits))
+                state = "allow";
+        else if (__mlog_test_u64(mask, mlog_not_bits))
+                state = "deny";
+        else
+                state = "off";
+
+        return snprintf(buf, PAGE_SIZE, "%s\n", state);
+}
+
+static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
+{
+        if (!strnicmp(buf, "allow", 5)) {
+                __mlog_set_u64(mask, mlog_and_bits);
+                __mlog_clear_u64(mask, mlog_not_bits);
+        } else if (!strnicmp(buf, "deny", 4)) {
+                __mlog_set_u64(mask, mlog_not_bits);
+                __mlog_clear_u64(mask, mlog_and_bits);
+        } else if (!strnicmp(buf, "off", 3)) {
+                __mlog_clear_u64(mask, mlog_not_bits);
+                __mlog_clear_u64(mask, mlog_and_bits);
+        } else
+                return -EINVAL;
+
+        return count;
+}
+
+struct mlog_attribute {
+        struct attribute attr;
+        u64 mask;
+};
+
+#define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr)
+
+#define define_mask(_name) {                    \
+        .attr = {                               \
+                .name = #_name,                 \
+                .mode = S_IRUGO | S_IWUSR,      \
+        },                                      \
+        .mask = ML_##_name,                     \
+}
+
+static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
+        define_mask(ENTRY),
+        define_mask(EXIT),
+        define_mask(TCP),
+        define_mask(MSG),
+        define_mask(SOCKET),
+        define_mask(HEARTBEAT),
+        define_mask(HB_BIO),
+        define_mask(DLMFS),
+        define_mask(DLM),
+        define_mask(DLM_DOMAIN),
+        define_mask(DLM_THREAD),
+        define_mask(DLM_MASTER),
+        define_mask(DLM_RECOVERY),
+        define_mask(AIO),
+        define_mask(JOURNAL),
+        define_mask(DISK_ALLOC),
+        define_mask(SUPER),
+        define_mask(FILE_IO),
+        define_mask(EXTENT_MAP),
+        define_mask(DLM_GLUE),
+        define_mask(BH_IO),
+        define_mask(UPTODATE),
+        define_mask(NAMEI),
+        define_mask(INODE),
+        define_mask(VOTE),
+        define_mask(DCACHE),
+        define_mask(CONN),
+        define_mask(QUORUM),
+        define_mask(EXPORT),
+        define_mask(ERROR),
+        define_mask(NOTICE),
+        define_mask(KTHREAD),
+};
+
+static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
+
+static ssize_t mlog_show(struct kobject *obj, struct attribute *attr,
+                         char *buf)
+{
+        struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
+
+        return mlog_mask_show(mlog_attr->mask, buf);
+}
+
+static ssize_t mlog_store(struct kobject *obj, struct attribute *attr,
+                          const char *buf, size_t count)
+{
+        struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
+
+        return mlog_mask_store(mlog_attr->mask, buf, count);
+}
+
+static struct sysfs_ops mlog_attr_ops = {
+        .show  = mlog_show,
+        .store = mlog_store,
+};
+
+static struct kobj_type mlog_ktype = {
+        .default_attrs = mlog_attr_ptrs,
+        .sysfs_ops     = &mlog_attr_ops,
+};
+
+static struct kset mlog_kset = {
+        .kobj   = {.name = "logmask", .ktype = &mlog_ktype},
+};
+
+int mlog_sys_init(struct subsystem *o2cb_subsys)
+{
+        int i = 0;
+
+        while (mlog_attrs[i].attr.mode) {
+                mlog_attr_ptrs[i] = &mlog_attrs[i].attr;
+                i++;
+        }
+        mlog_attr_ptrs[i] = NULL;
+
+        mlog_kset.subsys = o2cb_subsys;
+        return kset_register(&mlog_kset);
+}
+
+void mlog_sys_shutdown(void)
+{
+        kset_unregister(&mlog_kset);
+}