debugfs: split the beginning and the end of __create_file() off
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index adaaa04..100186c 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -305,11 +305,9 @@
};
MODULE_ALIAS_FS("debugfs");
-static struct dentry *__create_file(const char *name, umode_t mode,
- struct dentry *parent, void *data,
- const struct file_operations *fops)
+static struct dentry *start_creating(const char *name, struct dentry *parent)
{
- struct dentry *dentry = NULL;
+ struct dentry *dentry;
int error;
pr_debug("debugfs: creating file '%s'\n",name);
@@ -317,7 +315,7 @@
error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
&debugfs_mount_count);
if (error)
- goto exit;
+ 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
@@ -329,32 +327,51 @@
mutex_lock(&parent->d_inode->i_mutex);
dentry = lookup_one_len(name, parent, strlen(name));
- if (!IS_ERR(dentry)) {
- switch (mode & S_IFMT) {
- case S_IFDIR:
- error = debugfs_mkdir(dentry, mode);
-
- break;
- case S_IFLNK:
- error = debugfs_link(dentry, mode, data);
- break;
- default:
- error = debugfs_create(dentry, mode, data, fops);
- break;
- }
+ if (!IS_ERR(dentry) && dentry->d_inode) {
dput(dentry);
- } else
- error = PTR_ERR(dentry);
- mutex_unlock(&parent->d_inode->i_mutex);
+ dentry = ERR_PTR(-EEXIST);
+ }
+ if (IS_ERR(dentry))
+ mutex_unlock(&parent->d_inode->i_mutex);
+ return dentry;
+}
+
+static struct dentry *end_creating(struct dentry *dentry, int error)
+{
+ mutex_unlock(&dentry->d_parent->d_inode->i_mutex);
+ dput(dentry);
if (error) {
dentry = NULL;
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}
-exit:
return dentry;
}
+static struct dentry *__create_file(const char *name, umode_t mode,
+ struct dentry *parent, void *data,
+ const struct file_operations *fops)
+{
+ struct dentry *dentry = start_creating(name, parent);
+ int error;
+
+ if (IS_ERR(dentry))
+ return NULL;
+
+ switch (mode & S_IFMT) {
+ case S_IFDIR:
+ error = debugfs_mkdir(dentry, mode);
+ break;
+ case S_IFLNK:
+ error = debugfs_link(dentry, mode, data);
+ break;
+ default:
+ error = debugfs_create(dentry, mode, data, fops);
+ break;
+ }
+ return end_creating(dentry, error);
+}
+
/**
* debugfs_create_file - create a file in the debugfs filesystem
* @name: a pointer to a string containing the name of the file to create.
