From d0129aceaecc2b1f5171b8e8036eb469b6e0fe81 Mon Sep 17 00:00:00 2001 From: Sunil Mushran Date: Mon, 10 Mar 2008 15:16:26 -0700 Subject: [PATCH] ocfs2/dlm: Dumps the mles into a debugfs file This patch dumps all mles it can fit in one page into a debugfs file. Useful for debugging. Signed-off-by: Sunil Mushran Signed-off-by: Joel Becker Signed-off-by: Mark Fasheh --- fs/ocfs2/dlm/dlmdebug.c | 119 ++++++++++++++++++++++++++++++++++++++++ fs/ocfs2/dlm/dlmdebug.h | 1 + 2 files changed, 120 insertions(+) diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c index cccb1ce3372..6de326bf603 100644 --- a/fs/ocfs2/dlm/dlmdebug.c +++ b/fs/ocfs2/dlm/dlmdebug.c @@ -302,6 +302,7 @@ static int stringify_lockname(const char *lockname, int locklen, #define DLM_DEBUGFS_DIR "o2dlm" #define DLM_DEBUGFS_DLM_STATE "dlm_state" #define DLM_DEBUGFS_LOCKING_STATE "locking_state" +#define DLM_DEBUGFS_MLE_STATE "mle_state" /* begin - utils funcs */ static void dlm_debug_free(struct kref *kref) @@ -395,6 +396,112 @@ static int debug_buffer_release(struct inode *inode, struct file *file) } /* end - util funcs */ +/* begin - debug mle funcs */ +static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len) +{ + int out = 0; + unsigned int namelen; + const char *name; + char *mle_type; + + if (mle->type != DLM_MLE_MASTER) { + namelen = mle->u.name.len; + name = mle->u.name.name; + } else { + namelen = mle->u.res->lockname.len; + name = mle->u.res->lockname.name; + } + + if (mle->type == DLM_MLE_BLOCK) + mle_type = "BLK"; + else if (mle->type == DLM_MLE_MASTER) + mle_type = "MAS"; + else + mle_type = "MIG"; + + out += stringify_lockname(name, namelen, buf + out, len - out); + out += snprintf(buf + out, len - out, + "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n", + mle_type, mle->master, mle->new_master, + !list_empty(&mle->hb_events), + !!mle->inuse, + atomic_read(&mle->mle_refs.refcount)); + + out += snprintf(buf + out, len - out, "Maybe="); + out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES, + buf + out, len - out); + out += snprintf(buf + out, len - out, "\n"); + + out += snprintf(buf + out, len - out, "Vote="); + out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES, + buf + out, len - out); + out += snprintf(buf + out, len - out, "\n"); + + out += snprintf(buf + out, len - out, "Response="); + out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES, + buf + out, len - out); + out += snprintf(buf + out, len - out, "\n"); + + out += snprintf(buf + out, len - out, "Node="); + out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES, + buf + out, len - out); + out += snprintf(buf + out, len - out, "\n"); + + out += snprintf(buf + out, len - out, "\n"); + + return out; +} + +static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db) +{ + struct dlm_master_list_entry *mle; + int out = 0; + unsigned long total = 0; + + out += snprintf(db->buf + out, db->len - out, + "Dumping MLEs for Domain: %s\n", dlm->name); + + spin_lock(&dlm->master_lock); + list_for_each_entry(mle, &dlm->master_list, list) { + ++total; + if (db->len - out < 200) + continue; + out += dump_mle(mle, db->buf + out, db->len - out); + } + spin_unlock(&dlm->master_lock); + + out += snprintf(db->buf + out, db->len - out, + "Total on list: %ld\n", total); + return out; +} + +static int debug_mle_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_mle_print(dlm, db); + + file->private_data = db; + + return 0; +bail: + return -ENOMEM; +} + +static struct file_operations debug_mle_fops = { + .open = debug_mle_open, + .release = debug_buffer_release, + .read = debug_buffer_read, + .llseek = debug_buffer_llseek, +}; + +/* end - debug mle funcs */ + /* begin - debug lockres funcs */ static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len) { @@ -789,6 +896,16 @@ int dlm_debug_init(struct dlm_ctxt *dlm) goto bail; } + /* for dumping mles */ + dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE, + S_IFREG|S_IRUSR, + dlm->dlm_debugfs_subroot, + dlm, &debug_mle_fops); + if (!dc->debug_mle_dentry) { + mlog_errno(-ENOMEM); + goto bail; + } + dlm_debug_get(dc); return 0; @@ -802,6 +919,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm) struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; if (dc) { + if (dc->debug_mle_dentry) + debugfs_remove(dc->debug_mle_dentry); if (dc->debug_lockres_dentry) debugfs_remove(dc->debug_lockres_dentry); if (dc->debug_state_dentry) diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h index 7c5b2b0a05e..cbc69f29578 100644 --- a/fs/ocfs2/dlm/dlmdebug.h +++ b/fs/ocfs2/dlm/dlmdebug.h @@ -31,6 +31,7 @@ struct dlm_debug_ctxt { struct kref debug_refcnt; struct dentry *debug_state_dentry; struct dentry *debug_lockres_dentry; + struct dentry *debug_mle_dentry; }; struct debug_buffer { -- 2.34.1