ocfs2: Expose the file system state via debugfs

This patch creates a per mount debugfs file, fs_state, which exposes
information like, cluster stack in use, states of the downconvert, recovery
and commit threads, number of journal txns, some allocation stats, list of
all slots, etc.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

2 files changed, 177 insertions, 0 deletions

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 946d3c34b90b..18d8542a615e 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -308,6 +308,7 @@ struct ocfs2_super
         struct ocfs2_dlm_debug *osb_dlm_debug;
 
         struct dentry *osb_debug_root;
+        struct dentry *osb_ctxt;
 
         wait_queue_head_t recovery_event;
 
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 7ac83a81ee55..4eaf0e602bd0 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -201,6 +201,170 @@ static const match_table_t tokens = {
         {Opt_err, NULL}
 };
 
+#ifdef CONFIG_DEBUG_FS
+static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
+{
+        int out = 0;
+        int i;
+        struct ocfs2_cluster_connection *cconn = osb->cconn;
+        struct ocfs2_recovery_map *rm = osb->recovery_map;
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
+                        "Device", osb->dev_str, osb->uuid_str,
+                        osb->fs_generation, osb->vol_label);
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => State: %d  Flags: 0x%lX\n", "Volume",
+                        atomic_read(&osb->vol_state), osb->osb_flags);
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => Block: %lu  Cluster: %d\n", "Sizes",
+                        osb->sb->s_blocksize, osb->s_clustersize);
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => Compat: 0x%X  Incompat: 0x%X  "
+                        "ROcompat: 0x%X\n",
+                        "Features", osb->s_feature_compat,
+                        osb->s_feature_incompat, osb->s_feature_ro_compat);
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
+                        osb->s_mount_opt, osb->s_atime_quantum);
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => Stack: %s  Name: %*s  Version: %d.%d\n",
+                        "Cluster",
+                        (*osb->osb_cluster_stack == '\0' ?
+                         "o2cb" : osb->osb_cluster_stack),
+                        cconn->cc_namelen, cconn->cc_name,
+                        cconn->cc_version.pv_major, cconn->cc_version.pv_minor);
+
+        spin_lock(&osb->dc_task_lock);
+        out += snprintf(buf + out, len - out,
+                        "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
+                        "WorkSeq: %lu\n", "DownCnvt",
+                        task_pid_nr(osb->dc_task), osb->blocked_lock_count,
+                        osb->dc_wake_sequence, osb->dc_work_sequence);
+        spin_unlock(&osb->dc_task_lock);
+
+        spin_lock(&osb->osb_lock);
+        out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
+                        "Recovery",
+                        (osb->recovery_thread_task ?
+                         task_pid_nr(osb->recovery_thread_task) : -1));
+        if (rm->rm_used == 0)
+                out += snprintf(buf + out, len - out, " None\n");
+        else {
+                for (i = 0; i < rm->rm_used; i++)
+                        out += snprintf(buf + out, len - out, " %d",
+                                        rm->rm_entries[i]);
+                out += snprintf(buf + out, len - out, "\n");
+        }
+        spin_unlock(&osb->osb_lock);
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
+                        task_pid_nr(osb->commit_task), osb->osb_commit_interval,
+                        atomic_read(&osb->needs_checkpoint));
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => State: %d  NumTxns: %d  TxnId: %lu\n",
+                        "Journal", osb->journal->j_state,
+                        atomic_read(&osb->journal->j_num_trans),
+                        osb->journal->j_trans_id);
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
+                        "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
+                        "Stats",
+                        atomic_read(&osb->alloc_stats.bitmap_data),
+                        atomic_read(&osb->alloc_stats.local_data),
+                        atomic_read(&osb->alloc_stats.bg_allocs),
+                        atomic_read(&osb->alloc_stats.moves),
+                        atomic_read(&osb->alloc_stats.bg_extends));
+
+        out += snprintf(buf + out, len - out,
+                        "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
+                        "Default: %u bits\n",
+                        "LocalAlloc", osb->local_alloc_state,
+                        (unsigned long long)osb->la_last_gd,
+                        osb->local_alloc_bits, osb->local_alloc_default_bits);
+
+        spin_lock(&osb->osb_lock);
+        out += snprintf(buf + out, len - out,
+                        "%10s => Slot: %d  NumStolen: %d\n", "Steal",
+                        osb->s_inode_steal_slot,
+                        atomic_read(&osb->s_num_inodes_stolen));
+        spin_unlock(&osb->osb_lock);
+
+        out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
+                        "Slots", "Num", "RecoGen");
+
+        for (i = 0; i < osb->max_slots; ++i) {
+                out += snprintf(buf + out, len - out,
+                                "%10s  %c %3d  %10d\n",
+                                " ",
+                                (i == osb->slot_num ? '*' : ' '),
+                                i, osb->slot_recovery_generations[i]);
+        }
+
+        return out;
+}
+
+static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
+{
+        struct ocfs2_super *osb = inode->i_private;
+        char *buf = NULL;
+
+        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+        if (!buf)
+                goto bail;
+
+        i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
+
+        file->private_data = buf;
+
+        return 0;
+bail:
+        return -ENOMEM;
+}
+
+static int ocfs2_debug_release(struct inode *inode, struct file *file)
+{
+        kfree(file->private_data);
+        return 0;
+}
+
+static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
+                                size_t nbytes, loff_t *ppos)
+{
+        return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
+                                       i_size_read(file->f_mapping->host));
+}
+#else
+static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+static int ocfs2_debug_release(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
+                                size_t nbytes, loff_t *ppos)
+{
+        return 0;
+}
+#endif  /* CONFIG_DEBUG_FS */
+
+static struct file_operations ocfs2_osb_debug_fops = {
+        .open =         ocfs2_osb_debug_open,
+        .release =      ocfs2_debug_release,
+        .read =         ocfs2_debug_read,
+        .llseek =       generic_file_llseek,
+};
+
 /*
  * write_super and sync_fs ripped right out of ext3.
  */
@@ -926,6 +1090,16 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
                 goto read_super_error;
         }
 
+        osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
+                                            osb->osb_debug_root,
+                                            osb,
+                                            &ocfs2_osb_debug_fops);
+        if (!osb->osb_ctxt) {
+                status = -EINVAL;
+                mlog_errno(status);
+                goto read_super_error;
+        }
+
         status = ocfs2_mount_volume(sb);
         if (osb->root_inode)
                 inode = igrab(osb->root_inode);
@@ -1620,6 +1794,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
         osb = OCFS2_SB(sb);
         BUG_ON(!osb);
 
+        debugfs_remove(osb->osb_ctxt);
+
         ocfs2_disable_quotas(osb);
 
         ocfs2_shutdown_local_alloc(osb);