[PATCH] IPoIB: convert to debugfs

Convert IPoIB to use debugfs instead of its own custom debugging filesystem.

Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 18 insertions, 130 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_fs.c b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
index 044f2c78ef15..a84e5fe0f193 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_fs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
@@ -32,19 +32,16 @@
  * $Id: ipoib_fs.c 1389 2004-12-27 22:56:47Z roland $
  */
 
-#include <linux/pagemap.h>
+#include <linux/err.h>
 #include <linux/seq_file.h>
 
-#include "ipoib.h"
+struct file_operations;
 
-enum {
-        IPOIB_MAGIC = 0x49504942 /* "IPIB" */
-};
+#include <linux/debugfs.h>
+
+#include "ipoib.h"
 
-static DECLARE_MUTEX(ipoib_fs_mutex);
 static struct dentry *ipoib_root;
-static struct super_block *ipoib_sb;
-static LIST_HEAD(ipoib_device_list);
 
 static void *ipoib_mcg_seq_start(struct seq_file *file, loff_t *pos)
 {
@@ -145,143 +142,34 @@ static struct file_operations ipoib_fops = {
         .release = seq_release
 };
 
-static struct inode *ipoib_get_inode(void)
-{
-        struct inode *inode = new_inode(ipoib_sb);
-
-        if (inode) {
-                inode->i_mode    = S_IFREG | S_IRUGO;
-                inode->i_uid     = 0;
-                inode->i_gid     = 0;
-                inode->i_blksize = PAGE_CACHE_SIZE;
-                inode->i_blocks  = 0;
-                inode->i_atime   = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
-                inode->i_fop     = &ipoib_fops;
-        }
-
-        return inode;
-}
-
-static int __ipoib_create_debug_file(struct net_device *dev)
+int ipoib_create_debug_file(struct net_device *dev)
 {
         struct ipoib_dev_priv *priv = netdev_priv(dev);
-        struct dentry *dentry;
-        struct inode *inode;
         char name[IFNAMSIZ + sizeof "_mcg"];
 
         snprintf(name, sizeof name, "%s_mcg", dev->name);
 
-        dentry = d_alloc_name(ipoib_root, name);
-        if (!dentry)
-                return -ENOMEM;
-
-        inode = ipoib_get_inode();
-        if (!inode) {
-                dput(dentry);
-                return -ENOMEM;
-        }
-
-        inode->u.generic_ip = dev;
-        priv->mcg_dentry = dentry;
-
-        d_add(dentry, inode);
-
-        return 0;
-}
-
-int ipoib_create_debug_file(struct net_device *dev)
-{
-        struct ipoib_dev_priv *priv = netdev_priv(dev);
-
-        down(&ipoib_fs_mutex);
-
-        list_add_tail(&priv->fs_list, &ipoib_device_list);
-
-        if (!ipoib_sb) {
-                up(&ipoib_fs_mutex);
-                return 0;
-        }
-
-        up(&ipoib_fs_mutex);
+        priv->mcg_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
+                                               ipoib_root, dev, &ipoib_fops);
 
-        return __ipoib_create_debug_file(dev);
+        return priv->mcg_dentry ? 0 : -ENOMEM;
 }
 
 void ipoib_delete_debug_file(struct net_device *dev)
 {
         struct ipoib_dev_priv *priv = netdev_priv(dev);
 
-        down(&ipoib_fs_mutex);
-        list_del(&priv->fs_list);
-        if (!ipoib_sb) {
-                up(&ipoib_fs_mutex);
-                return;
-        }
-        up(&ipoib_fs_mutex);
-
-        if (priv->mcg_dentry) {
-                d_drop(priv->mcg_dentry);
-                simple_unlink(ipoib_root->d_inode, priv->mcg_dentry);
-        }
-}
-
-static int ipoib_fill_super(struct super_block *sb, void *data, int silent)
-{
-        static struct tree_descr ipoib_files[] = {
-                { "" }
-        };
-        struct ipoib_dev_priv *priv;
-        int ret;
-
-        ret = simple_fill_super(sb, IPOIB_MAGIC, ipoib_files);
-        if (ret)
-                return ret;
-
-        ipoib_root = sb->s_root;
-
-        down(&ipoib_fs_mutex);
-
-        ipoib_sb = sb;
-
-        list_for_each_entry(priv, &ipoib_device_list, fs_list) {
-                ret = __ipoib_create_debug_file(priv->dev);
-                if (ret)
-                        break;
-        }
-
-        up(&ipoib_fs_mutex);
-
-        return ret;
-}
-
-static struct super_block *ipoib_get_sb(struct file_system_type *fs_type,
-        int flags, const char *dev_name, void *data)
-{
-        return get_sb_single(fs_type, flags, data, ipoib_fill_super);
+        if (priv->mcg_dentry)
+                debugfs_remove(priv->mcg_dentry);
 }
 
-static void ipoib_kill_sb(struct super_block *sb)
-{
-        down(&ipoib_fs_mutex);
-        ipoib_sb = NULL;
-        up(&ipoib_fs_mutex);
-
-        kill_litter_super(sb);
-}
-
-static struct file_system_type ipoib_fs_type = {
-        .owner          = THIS_MODULE,
-        .name           = "ipoib_debugfs",
-        .get_sb         = ipoib_get_sb,
-        .kill_sb        = ipoib_kill_sb,
-};
-
 int ipoib_register_debugfs(void)
 {
-        return register_filesystem(&ipoib_fs_type);
+        ipoib_root = debugfs_create_dir("ipoib", NULL);
+        return ipoib_root ? 0 : -ENOMEM;
 }
 
 void ipoib_unregister_debugfs(void)
 {
-        unregister_filesystem(&ipoib_fs_type);
+        debugfs_remove(ipoib_root);
 }
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 8d35475a1d56..6f60abbaebd5 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1082,19 +1082,19 @@ static int __init ipoib_init_module(void)
 
         return 0;
 
-err_fs:
-        ipoib_unregister_debugfs();
-
 err_wq:
         destroy_workqueue(ipoib_workqueue);
 
+err_fs:
+        ipoib_unregister_debugfs();
+
         return ret;
 }
 
 static void __exit ipoib_cleanup_module(void)
 {
-        ipoib_unregister_debugfs();
         ib_unregister_client(&ipoib_client);
+        ipoib_unregister_debugfs();
         destroy_workqueue(ipoib_workqueue);
 }