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Date: Wed, 2 Apr 2008 13:14:52 -0700
From: Mark Fasheh <mfasheh@...e.com>
To: linux-kernel@...r.kernel.org
Cc: ocfs2-devel@....oracle.com, Joel Becker <joel.becker@...cle.com>,
Sunil Mushran <sunil.mushran@...cle.com>
Subject: [PATCH 42/62] ocfs2/dlm: Dumps the lockres' into a debugfs file
From: Sunil Mushran <sunil.mushran@...cle.com>
This patch dumps all the lockres' alongwith all the locks into
a debugfs file. Useful for debugging.
Signed-off-by: Sunil Mushran <sunil.mushran@...cle.com>
Signed-off-by: Joel Becker <joel.becker@...cle.com>
Signed-off-by: Mark Fasheh <mfasheh@...e.com>
---
fs/ocfs2/dlm/dlmdebug.c | 247 +++++++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/dlm/dlmdebug.h | 8 ++
2 files changed, 255 insertions(+), 0 deletions(-)
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index e335403..cccb1ce 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -273,8 +273,35 @@ EXPORT_SYMBOL_GPL(dlm_errname);
static struct dentry *dlm_debugfs_root = NULL;
+/* NOTE: This function converts a lockname into a string. It uses knowledge
+ * of the format of the lockname that should be outside the purview of the dlm.
+ * We are adding only to make dlm debugging slightly easier.
+ *
+ * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
+ */
+static int stringify_lockname(const char *lockname, int locklen,
+ char *buf, int len)
+{
+ int out = 0;
+ __be64 inode_blkno_be;
+
+#define OCFS2_DENTRY_LOCK_INO_START 18
+ if (*lockname == 'N') {
+ memcpy((__be64 *)&inode_blkno_be,
+ (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
+ sizeof(__be64));
+ out += snprintf(buf + out, len - out, "%.*s%08x",
+ OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
+ (unsigned int)be64_to_cpu(inode_blkno_be));
+ } else
+ out += snprintf(buf + out, len - out, "%.*s",
+ locklen, lockname);
+ return out;
+}
+
#define DLM_DEBUGFS_DIR "o2dlm"
#define DLM_DEBUGFS_DLM_STATE "dlm_state"
+#define DLM_DEBUGFS_LOCKING_STATE "locking_state"
/* begin - utils funcs */
static void dlm_debug_free(struct kref *kref)
@@ -368,6 +395,213 @@ static int debug_buffer_release(struct inode *inode, struct file *file)
}
/* end - util funcs */
+/* begin - debug lockres funcs */
+static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
+{
+ int out;
+
+#define DEBUG_LOCK_VERSION 1
+ spin_lock(&lock->spinlock);
+ out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
+ "%d,%d,%d,%d\n",
+ DEBUG_LOCK_VERSION,
+ list_type, lock->ml.type, lock->ml.convert_type,
+ lock->ml.node,
+ dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
+ dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
+ !list_empty(&lock->ast_list),
+ !list_empty(&lock->bast_list),
+ lock->ast_pending, lock->bast_pending,
+ lock->convert_pending, lock->lock_pending,
+ lock->cancel_pending, lock->unlock_pending,
+ atomic_read(&lock->lock_refs.refcount));
+ spin_unlock(&lock->spinlock);
+
+ return out;
+}
+
+static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
+{
+ struct dlm_lock *lock;
+ int i;
+ int out = 0;
+
+ out += snprintf(buf + out, len - out, "NAME:");
+ out += stringify_lockname(res->lockname.name, res->lockname.len,
+ buf + out, len - out);
+ out += snprintf(buf + out, len - out, "\n");
+
+#define DEBUG_LRES_VERSION 1
+ out += snprintf(buf + out, len - out,
+ "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
+ DEBUG_LRES_VERSION,
+ res->owner, res->state, res->last_used,
+ !list_empty(&res->purge),
+ !list_empty(&res->dirty),
+ !list_empty(&res->recovering),
+ res->inflight_locks, res->migration_pending,
+ atomic_read(&res->asts_reserved),
+ atomic_read(&res->refs.refcount));
+
+ /* refmap */
+ out += snprintf(buf + out, len - out, "RMAP:");
+ out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
+ buf + out, len - out);
+ out += snprintf(buf + out, len - out, "\n");
+
+ /* lvb */
+ out += snprintf(buf + out, len - out, "LVBX:");
+ for (i = 0; i < DLM_LVB_LEN; i++)
+ out += snprintf(buf + out, len - out,
+ "%02x", (unsigned char)res->lvb[i]);
+ out += snprintf(buf + out, len - out, "\n");
+
+ /* granted */
+ list_for_each_entry(lock, &res->granted, list)
+ out += dump_lock(lock, 0, buf + out, len - out);
+
+ /* converting */
+ list_for_each_entry(lock, &res->converting, list)
+ out += dump_lock(lock, 1, buf + out, len - out);
+
+ /* blocked */
+ list_for_each_entry(lock, &res->blocked, list)
+ out += dump_lock(lock, 2, buf + out, len - out);
+
+ out += snprintf(buf + out, len - out, "\n");
+
+ return out;
+}
+
+static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
+{
+ struct debug_lockres *dl = m->private;
+ struct dlm_ctxt *dlm = dl->dl_ctxt;
+ struct dlm_lock_resource *res = NULL;
+
+ spin_lock(&dlm->spinlock);
+
+ if (dl->dl_res) {
+ list_for_each_entry(res, &dl->dl_res->tracking, tracking) {
+ if (dl->dl_res) {
+ dlm_lockres_put(dl->dl_res);
+ dl->dl_res = NULL;
+ }
+ if (&res->tracking == &dlm->tracking_list) {
+ mlog(0, "End of list found, %p\n", res);
+ dl = NULL;
+ break;
+ }
+ dlm_lockres_get(res);
+ dl->dl_res = res;
+ break;
+ }
+ } else {
+ if (!list_empty(&dlm->tracking_list)) {
+ list_for_each_entry(res, &dlm->tracking_list, tracking)
+ break;
+ dlm_lockres_get(res);
+ dl->dl_res = res;
+ } else
+ dl = NULL;
+ }
+
+ if (dl) {
+ spin_lock(&dl->dl_res->spinlock);
+ dump_lockres(dl->dl_res, dl->dl_buf, dl->dl_len - 1);
+ spin_unlock(&dl->dl_res->spinlock);
+ }
+
+ spin_unlock(&dlm->spinlock);
+
+ return dl;
+}
+
+static void lockres_seq_stop(struct seq_file *m, void *v)
+{
+}
+
+static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ return NULL;
+}
+
+static int lockres_seq_show(struct seq_file *s, void *v)
+{
+ struct debug_lockres *dl = (struct debug_lockres *)v;
+
+ seq_printf(s, "%s", dl->dl_buf);
+
+ return 0;
+}
+
+static struct seq_operations debug_lockres_ops = {
+ .start = lockres_seq_start,
+ .stop = lockres_seq_stop,
+ .next = lockres_seq_next,
+ .show = lockres_seq_show,
+};
+
+static int debug_lockres_open(struct inode *inode, struct file *file)
+{
+ struct dlm_ctxt *dlm = inode->i_private;
+ int ret = -ENOMEM;
+ struct seq_file *seq;
+ struct debug_lockres *dl = NULL;
+
+ dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
+ if (!dl) {
+ mlog_errno(ret);
+ goto bail;
+ }
+
+ dl->dl_len = PAGE_SIZE;
+ dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
+ if (!dl->dl_buf) {
+ mlog_errno(ret);
+ goto bail;
+ }
+
+ ret = seq_open(file, &debug_lockres_ops);
+ if (ret) {
+ mlog_errno(ret);
+ goto bail;
+ }
+
+ seq = (struct seq_file *) file->private_data;
+ seq->private = dl;
+
+ dlm_grab(dlm);
+ dl->dl_ctxt = dlm;
+
+ return 0;
+bail:
+ if (dl)
+ kfree(dl->dl_buf);
+ kfree(dl);
+ return ret;
+}
+
+static int debug_lockres_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = (struct seq_file *)file->private_data;
+ struct debug_lockres *dl = (struct debug_lockres *)seq->private;
+
+ if (dl->dl_res)
+ dlm_lockres_put(dl->dl_res);
+ dlm_put(dl->dl_ctxt);
+ kfree(dl->dl_buf);
+ return seq_release_private(inode, file);
+}
+
+static struct file_operations debug_lockres_fops = {
+ .open = debug_lockres_open,
+ .release = debug_lockres_release,
+ .read = seq_read,
+ .llseek = seq_lseek,
+};
+/* end - debug lockres funcs */
+
/* begin - debug state funcs */
static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
{
@@ -544,6 +778,17 @@ int dlm_debug_init(struct dlm_ctxt *dlm)
goto bail;
}
+ /* for dumping lockres */
+ dc->debug_lockres_dentry =
+ debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
+ S_IFREG|S_IRUSR,
+ dlm->dlm_debugfs_subroot,
+ dlm, &debug_lockres_fops);
+ if (!dc->debug_lockres_dentry) {
+ mlog_errno(-ENOMEM);
+ goto bail;
+ }
+
dlm_debug_get(dc);
return 0;
@@ -557,6 +802,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm)
struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
if (dc) {
+ if (dc->debug_lockres_dentry)
+ debugfs_remove(dc->debug_lockres_dentry);
if (dc->debug_state_dentry)
debugfs_remove(dc->debug_state_dentry);
dlm_debug_put(dc);
diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h
index 94cc10a..7c5b2b0 100644
--- a/fs/ocfs2/dlm/dlmdebug.h
+++ b/fs/ocfs2/dlm/dlmdebug.h
@@ -30,6 +30,7 @@
struct dlm_debug_ctxt {
struct kref debug_refcnt;
struct dentry *debug_state_dentry;
+ struct dentry *debug_lockres_dentry;
};
struct debug_buffer {
@@ -37,6 +38,13 @@ struct debug_buffer {
char *buf;
};
+struct debug_lockres {
+ int dl_len;
+ char *dl_buf;
+ struct dlm_ctxt *dl_ctxt;
+ struct dlm_lock_resource *dl_res;
+};
+
int dlm_debug_init(struct dlm_ctxt *dlm);
void dlm_debug_shutdown(struct dlm_ctxt *dlm);
--
1.5.4.1
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