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Subject[PATCH 02/61] debugfs: add rename for debugfs files
Date
From: Jan Kara <jack@suse.cz>

Implement debugfs_rename() to allow renaming files/directories in debugfs.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
fs/debugfs/inode.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/debugfs.h | 9 ++++++
2 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index ec8896b..1d533a2 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -368,6 +368,69 @@ void debugfs_remove(struct dentry *dentry)
}
EXPORT_SYMBOL_GPL(debugfs_remove);

+/**
+ * debugfs_rename - rename a file/directory in the debugfs filesystem
+ * @old_dir: a pointer to the parent dentry for the renamed object. This
+ * should be a directory dentry.
+ * @old_dentry: dentry of an object to be renamed.
+ * @new_dir: a pointer to the parent dentry where the object should be
+ * moved. This should be a directory dentry.
+ * @new_name: a pointer to a string containing the target name.
+ *
+ * This function renames a file/directory in debugfs. The target must not
+ * exist for rename to succeed.
+ *
+ * This function will return a pointer to old_dentry (which is updated to
+ * reflect renaming) if it succeeds. If an error occurs, %NULL will be
+ * returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -%ENODEV will be
+ * returned.
+ */
+struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+ struct dentry *new_dir, const char *new_name)
+{
+ int error;
+ struct dentry *dentry = NULL, *trap;
+ const char *old_name;
+
+ trap = lock_rename(new_dir, old_dir);
+ /* Source or destination directories don't exist? */
+ if (!old_dir->d_inode || !new_dir->d_inode)
+ goto exit;
+ /* Source does not exist, cyclic rename, or mountpoint? */
+ if (!old_dentry->d_inode || old_dentry == trap ||
+ d_mountpoint(old_dentry))
+ goto exit;
+ dentry = lookup_one_len(new_name, new_dir, strlen(new_name));
+ /* Lookup failed, cyclic rename or target exists? */
+ if (IS_ERR(dentry) || dentry == trap || dentry->d_inode)
+ goto exit;
+
+ old_name = fsnotify_oldname_init(old_dentry->d_name.name);
+
+ error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode,
+ dentry);
+ if (error) {
+ fsnotify_oldname_free(old_name);
+ goto exit;
+ }
+ d_move(old_dentry, dentry);
+ fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name,
+ old_dentry->d_name.name, S_ISDIR(old_dentry->d_inode->i_mode),
+ NULL, old_dentry->d_inode);
+ fsnotify_oldname_free(old_name);
+ unlock_rename(new_dir, old_dir);
+ dput(dentry);
+ return old_dentry;
+exit:
+ if (dentry && !IS_ERR(dentry))
+ dput(dentry);
+ unlock_rename(new_dir, old_dir);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(debugfs_rename);
+
static decl_subsys(debug, NULL, NULL);

static int __init debugfs_init(void)
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 5a9c495..104e51e 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -38,6 +38,9 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,

void debugfs_remove(struct dentry *dentry);

+struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+ struct dentry *new_dir, const char *new_name);
+
struct dentry *debugfs_create_u8(const char *name, mode_t mode,
struct dentry *parent, u8 *value);
struct dentry *debugfs_create_u16(const char *name, mode_t mode,
@@ -85,6 +88,12 @@ static inline struct dentry *debugfs_create_symlink(const char *name,
static inline void debugfs_remove(struct dentry *dentry)
{ }

+static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+ struct dentry *new_dir, char *new_name)
+{
+ return ERR_PTR(-ENODEV);
+}
+
static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
struct dentry *parent,
u8 *value)
--
1.5.2.2
-
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