1 files changed, 28 insertions, 6 deletions

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 1e444fe1f778..042b688ed124 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -2,13 +2,16 @@
 /*
  *  inode.c - part of debugfs, a tiny little debug file system
  *
- *  Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ *  Copyright (C) 2004,2019 Greg Kroah-Hartman <greg@kroah.com>
  *  Copyright (C) 2004 IBM Inc.
+ *  Copyright (C) 2019 Linux Foundation <gregkh@linuxfoundation.org>
  *
  *  debugfs is for people to use instead of /proc or /sys.
  *  See ./Documentation/core-api/kernel-api.rst for more details.
  */
 
+#define pr_fmt(fmt)     "debugfs: " fmt
+
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/mount.h>
@@ -285,15 +288,17 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
         struct dentry *dentry;
         int error;
 
-        pr_debug("debugfs: creating file '%s'\n",name);
+        pr_debug("creating file '%s'\n", name);
 
         if (IS_ERR(parent))
                 return parent;
 
         error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
                               &debugfs_mount_count);
-        if (error)
+        if (error) {
+                pr_err("Unable to pin filesystem for file '%s'\n", name);
                 return ERR_PTR(error);
+        }
 
         /* If the parent is not specified, we create it in the root.
          * We need the root dentry to do this, which is in the super
@@ -306,6 +311,12 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
         inode_lock(d_inode(parent));
         dentry = lookup_one_len(name, parent, strlen(name));
         if (!IS_ERR(dentry) && d_really_is_positive(dentry)) {
+                if (d_is_dir(dentry))
+                        pr_err("Directory '%s' with parent '%s' already present!\n",
+                               name, parent->d_name.name);
+                else
+                        pr_err("File '%s' in directory '%s' already present!\n",
+                               name, parent->d_name.name);
                 dput(dentry);
                 dentry = ERR_PTR(-EEXIST);
         }
@@ -349,8 +360,11 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode,
                 return dentry;
 
         inode = debugfs_get_inode(dentry->d_sb);
-        if (unlikely(!inode))
+        if (unlikely(!inode)) {
+                pr_err("out of free dentries, can not create file '%s'\n",
+                       name);
                 return failed_creating(dentry);
+        }
 
         inode->i_mode = mode;
         inode->i_private = data;
@@ -511,8 +525,11 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
                 return dentry;
 
         inode = debugfs_get_inode(dentry->d_sb);
-        if (unlikely(!inode))
+        if (unlikely(!inode)) {
+                pr_err("out of free dentries, can not create directory '%s'\n",
+                       name);
                 return failed_creating(dentry);
+        }
 
         inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
         inode->i_op = &simple_dir_inode_operations;
@@ -550,8 +567,11 @@ struct dentry *debugfs_create_automount(const char *name,
                 return dentry;
 
         inode = debugfs_get_inode(dentry->d_sb);
-        if (unlikely(!inode))
+        if (unlikely(!inode)) {
+                pr_err("out of free dentries, can not create automount '%s'\n",
+                       name);
                 return failed_creating(dentry);
+        }
 
         make_empty_dir_inode(inode);
         inode->i_flags |= S_AUTOMOUNT;
@@ -606,6 +626,8 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
 
         inode = debugfs_get_inode(dentry->d_sb);
         if (unlikely(!inode)) {
+                pr_err("out of free dentries, can not create symlink '%s'\n",
+                       name);
                 kfree(link);
                 return failed_creating(dentry);
         }