dlm: add new debugfs entry

The new debugfs entry dumps all rsb and lkb structures, and includes
a lot more information than has been available before.  This includes
the new timestamps added by a previous patch for debugging callback
issues.

Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 246 insertions, 50 deletions

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 19e4f9eb44e1..2f107d1a6a45 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -1,7 +1,7 @@
 /******************************************************************************
 *******************************************************************************
 **
-**  Copyright (C) 2005 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2005-2008 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -27,7 +27,7 @@ static struct dentry *dlm_root;
 
 struct rsb_iter {
         int entry;
-        int locks;
+        int format;
         int header;
         struct dlm_ls *ls;
         struct list_head *next;
@@ -60,8 +60,8 @@ static char *print_lockmode(int mode)
         }
 }
 
-static void print_resource_lock(struct seq_file *s, struct dlm_lkb *lkb,
-                                struct dlm_rsb *res)
+static void print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
+                               struct dlm_rsb *res)
 {
         seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
 
@@ -83,7 +83,7 @@ static void print_resource_lock(struct seq_file *s, struct dlm_lkb *lkb,
         seq_printf(s, "\n");
 }
 
-static int print_resource(struct dlm_rsb *res, struct seq_file *s)
+static int print_format1(struct dlm_rsb *res, struct seq_file *s)
 {
         struct dlm_lkb *lkb;
         int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
@@ -134,15 +134,15 @@ static int print_resource(struct dlm_rsb *res, struct seq_file *s)
         /* Print the locks attached to this resource */
         seq_printf(s, "Granted Queue\n");
         list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue)
-                print_resource_lock(s, lkb, res);
+                print_format1_lock(s, lkb, res);
 
         seq_printf(s, "Conversion Queue\n");
         list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue)
-                print_resource_lock(s, lkb, res);
+                print_format1_lock(s, lkb, res);
 
         seq_printf(s, "Waiting Queue\n");
         list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue)
-                print_resource_lock(s, lkb, res);
+                print_format1_lock(s, lkb, res);
 
         if (list_empty(&res->res_lookup))
                 goto out;
@@ -160,7 +160,8 @@ static int print_resource(struct dlm_rsb *res, struct seq_file *s)
         return 0;
 }
 
-static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *r)
+static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
+                               struct dlm_rsb *r)
 {
         u64 xid = 0;
         u64 us;
@@ -193,20 +194,108 @@ static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *
                    r->res_name);
 }
 
-static int print_locks(struct dlm_rsb *r, struct seq_file *s)
+static int print_format2(struct dlm_rsb *r, struct seq_file *s)
 {
         struct dlm_lkb *lkb;
 
         lock_rsb(r);
 
         list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue)
-                print_lock(s, lkb, r);
+                print_format2_lock(s, lkb, r);
 
         list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue)
-                print_lock(s, lkb, r);
+                print_format2_lock(s, lkb, r);
 
         list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue)
-                print_lock(s, lkb, r);
+                print_format2_lock(s, lkb, r);
+
+        unlock_rsb(r);
+        return 0;
+}
+
+static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
+                               int rsb_lookup)
+{
+        u64 xid = 0;
+
+        if (lkb->lkb_flags & DLM_IFL_USER) {
+                if (lkb->lkb_ua)
+                        xid = lkb->lkb_ua->xid;
+        }
+
+        seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
+                   lkb->lkb_id,
+                   lkb->lkb_nodeid,
+                   lkb->lkb_remid,
+                   lkb->lkb_ownpid,
+                   (unsigned long long)xid,
+                   lkb->lkb_exflags,
+                   lkb->lkb_flags,
+                   lkb->lkb_status,
+                   lkb->lkb_grmode,
+                   lkb->lkb_rqmode,
+                   lkb->lkb_highbast,
+                   rsb_lookup,
+                   lkb->lkb_wait_type,
+                   lkb->lkb_lvbseq,
+                   (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
+                   (unsigned long long)ktime_to_ns(lkb->lkb_time_bast));
+}
+
+static int print_format3(struct dlm_rsb *r, struct seq_file *s)
+{
+        struct dlm_lkb *lkb;
+        int i, lvblen = r->res_ls->ls_lvblen;
+        int print_name = 1;
+
+        lock_rsb(r);
+
+        seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
+                   r,
+                   r->res_nodeid,
+                   r->res_first_lkid,
+                   r->res_flags,
+                   !list_empty(&r->res_root_list),
+                   !list_empty(&r->res_recover_list),
+                   r->res_recover_locks_count,
+                   r->res_length);
+
+        for (i = 0; i < r->res_length; i++) {
+                if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
+                        print_name = 0;
+        }
+
+        seq_printf(s, "%s", print_name ? "str " : "hex");
+
+        for (i = 0; i < r->res_length; i++) {
+                if (print_name)
+                        seq_printf(s, "%c", r->res_name[i]);
+                else
+                        seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
+        }
+        seq_printf(s, "\n");
+
+        if (!r->res_lvbptr)
+                goto do_locks;
+
+        seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen);
+
+        for (i = 0; i < lvblen; i++)
+                seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
+        seq_printf(s, "\n");
+
+ do_locks:
+        list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue)
+                print_format3_lock(s, lkb, 0);
+
+        list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue)
+                print_format3_lock(s, lkb, 0);
+
+        list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue)
+                print_format3_lock(s, lkb, 0);
+
+        list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup)
+                print_format3_lock(s, lkb, 1);
 
         unlock_rsb(r);
         return 0;
@@ -231,7 +320,7 @@ static int rsb_iter_next(struct rsb_iter *ri)
                                 break;
                         }
                         read_unlock(&ls->ls_rsbtbl[i].lock);
-                }
+                }
                 ri->entry = i;
 
                 if (ri->entry >= ls->ls_rsbtbl_size)
@@ -248,7 +337,7 @@ static int rsb_iter_next(struct rsb_iter *ri)
                         read_unlock(&ls->ls_rsbtbl[i].lock);
                         dlm_put_rsb(old);
                         goto top;
-                }
+                }
                 ri->rsb = list_entry(ri->next, struct dlm_rsb, res_hashchain);
                 dlm_hold_rsb(ri->rsb);
                 read_unlock(&ls->ls_rsbtbl[i].lock);
@@ -274,6 +363,7 @@ static struct rsb_iter *rsb_iter_init(struct dlm_ls *ls)
         ri->ls = ls;
         ri->entry = 0;
         ri->next = NULL;
+        ri->format = 1;
 
         if (rsb_iter_next(ri)) {
                 rsb_iter_free(ri);
@@ -325,16 +415,26 @@ static int rsb_seq_show(struct seq_file *file, void *iter_ptr)
 {
         struct rsb_iter *ri = iter_ptr;
 
-        if (ri->locks) {
+        switch (ri->format) {
+        case 1:
+                print_format1(ri->rsb, file);
+                break;
+        case 2:
                 if (ri->header) {
-                        seq_printf(file, "id nodeid remid pid xid exflags flags "
-                                         "sts grmode rqmode time_ms r_nodeid "
-                                         "r_len r_name\n");
+                        seq_printf(file, "id nodeid remid pid xid exflags "
+                                         "flags sts grmode rqmode time_ms "
+                                         "r_nodeid r_len r_name\n");
                         ri->header = 0;
                 }
-                print_locks(ri->rsb, file);
-        } else {
-                print_resource(ri->rsb, file);
+                print_format2(ri->rsb, file);
+                break;
+        case 3:
+                if (ri->header) {
+                        seq_printf(file, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
+                        ri->header = 0;
+                }
+                print_format3(ri->rsb, file);
+                break;
         }
 
         return 0;
@@ -385,7 +485,7 @@ static struct rsb_iter *locks_iter_init(struct dlm_ls *ls, loff_t *pos)
         ri->ls = ls;
         ri->entry = 0;
         ri->next = NULL;
-        ri->locks = 1;
+        ri->format = 2;
 
         if (*pos == 0)
                 ri->header = 1;
@@ -448,6 +548,84 @@ static const struct file_operations locks_fops = {
 };
 
 /*
+ * Dump all rsb/lvb/lkb state in compact listing, more complete than _locks
+ * This can replace both formats 1 and 2 eventually.
+ */
+
+static struct rsb_iter *all_iter_init(struct dlm_ls *ls, loff_t *pos)
+{
+        struct rsb_iter *ri;
+
+        ri = kzalloc(sizeof *ri, GFP_KERNEL);
+        if (!ri)
+                return NULL;
+
+        ri->ls = ls;
+        ri->entry = 0;
+        ri->next = NULL;
+        ri->format = 3;
+
+        if (*pos == 0)
+                ri->header = 1;
+
+        if (rsb_iter_next(ri)) {
+                rsb_iter_free(ri);
+                return NULL;
+        }
+
+        return ri;
+}
+
+static void *all_seq_start(struct seq_file *file, loff_t *pos)
+{
+        struct rsb_iter *ri;
+        loff_t n = *pos;
+
+        ri = all_iter_init(file->private, pos);
+        if (!ri)
+                return NULL;
+
+        while (n--) {
+                if (rsb_iter_next(ri)) {
+                        rsb_iter_free(ri);
+                        return NULL;
+                }
+        }
+
+        return ri;
+}
+
+static struct seq_operations all_seq_ops = {
+        .start = all_seq_start,
+        .next  = rsb_seq_next,
+        .stop  = rsb_seq_stop,
+        .show  = rsb_seq_show,
+};
+
+static int all_open(struct inode *inode, struct file *file)
+{
+        struct seq_file *seq;
+        int ret;
+
+        ret = seq_open(file, &all_seq_ops);
+        if (ret)
+                return ret;
+
+        seq = file->private_data;
+        seq->private = inode->i_private;
+
+        return 0;
+}
+
+static const struct file_operations all_fops = {
+        .owner   = THIS_MODULE,
+        .open    = all_open,
+        .read    = seq_read,
+        .llseek  = seq_lseek,
+        .release = seq_release
+};
+
+/*
  * dump lkb's on the ls_waiters list
  */
 
@@ -489,30 +667,33 @@ static const struct file_operations waiters_fops = {
         .read    = waiters_read
 };
 
+void dlm_delete_debug_file(struct dlm_ls *ls)
+{
+        if (ls->ls_debug_rsb_dentry)
+                debugfs_remove(ls->ls_debug_rsb_dentry);
+        if (ls->ls_debug_waiters_dentry)
+                debugfs_remove(ls->ls_debug_waiters_dentry);
+        if (ls->ls_debug_locks_dentry)
+                debugfs_remove(ls->ls_debug_locks_dentry);
+        if (ls->ls_debug_all_dentry)
+                debugfs_remove(ls->ls_debug_all_dentry);
+}
+
 int dlm_create_debug_file(struct dlm_ls *ls)
 {
         char name[DLM_LOCKSPACE_LEN+8];
 
+        /* format 1 */
+
         ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
                                                       S_IFREG | S_IRUGO,
                                                       dlm_root,
                                                       ls,
                                                       &rsb_fops);
         if (!ls->ls_debug_rsb_dentry)
-                return -ENOMEM;
+                goto fail;
 
-        memset(name, 0, sizeof(name));
-        snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
-
-        ls->ls_debug_waiters_dentry = debugfs_create_file(name,
-                                                          S_IFREG | S_IRUGO,
-                                                          dlm_root,
-                                                          ls,
-                                                          &waiters_fops);
-        if (!ls->ls_debug_waiters_dentry) {
-                debugfs_remove(ls->ls_debug_rsb_dentry);
-                return -ENOMEM;
-        }
+        /* format 2 */
 
         memset(name, 0, sizeof(name));
         snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name);
@@ -522,23 +703,38 @@ int dlm_create_debug_file(struct dlm_ls *ls)
                                                         dlm_root,
                                                         ls,
                                                         &locks_fops);
-        if (!ls->ls_debug_locks_dentry) {
-                debugfs_remove(ls->ls_debug_waiters_dentry);
-                debugfs_remove(ls->ls_debug_rsb_dentry);
-                return -ENOMEM;
-        }
+        if (!ls->ls_debug_locks_dentry)
+                goto fail;
+
+        /* format 3 */
+
+        memset(name, 0, sizeof(name));
+        snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name);
+
+        ls->ls_debug_all_dentry = debugfs_create_file(name,
+                                                      S_IFREG | S_IRUGO,
+                                                      dlm_root,
+                                                      ls,
+                                                      &all_fops);
+        if (!ls->ls_debug_all_dentry)
+                goto fail;
+
+        memset(name, 0, sizeof(name));
+        snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
+
+        ls->ls_debug_waiters_dentry = debugfs_create_file(name,
+                                                          S_IFREG | S_IRUGO,
+                                                          dlm_root,
+                                                          ls,
+                                                          &waiters_fops);
+        if (!ls->ls_debug_waiters_dentry)
+                goto fail;
 
         return 0;
-}
 
-void dlm_delete_debug_file(struct dlm_ls *ls)
-{
-        if (ls->ls_debug_rsb_dentry)
-                debugfs_remove(ls->ls_debug_rsb_dentry);
-        if (ls->ls_debug_waiters_dentry)
-                debugfs_remove(ls->ls_debug_waiters_dentry);
-        if (ls->ls_debug_locks_dentry)
-                debugfs_remove(ls->ls_debug_locks_dentry);
+ fail:
+        dlm_delete_debug_file(ls);
+        return -ENOMEM;
 }
 
 int __init dlm_register_debugfs(void)