forked from luck/tmp_suning_uos_patched
debugfs: add rename for debugfs files
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>
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46336009b5
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@ -368,6 +368,69 @@ void debugfs_remove(struct dentry *dentry)
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}
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EXPORT_SYMBOL_GPL(debugfs_remove);
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/**
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* debugfs_rename - rename a file/directory in the debugfs filesystem
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* @old_dir: a pointer to the parent dentry for the renamed object. This
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* should be a directory dentry.
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* @old_dentry: dentry of an object to be renamed.
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* @new_dir: a pointer to the parent dentry where the object should be
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* moved. This should be a directory dentry.
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* @new_name: a pointer to a string containing the target name.
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*
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* This function renames a file/directory in debugfs. The target must not
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* exist for rename to succeed.
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*
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* This function will return a pointer to old_dentry (which is updated to
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* reflect renaming) if it succeeds. If an error occurs, %NULL will be
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* returned.
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*
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* If debugfs is not enabled in the kernel, the value -%ENODEV will be
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* returned.
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*/
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struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
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struct dentry *new_dir, const char *new_name)
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{
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int error;
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struct dentry *dentry = NULL, *trap;
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const char *old_name;
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trap = lock_rename(new_dir, old_dir);
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/* Source or destination directories don't exist? */
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if (!old_dir->d_inode || !new_dir->d_inode)
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goto exit;
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/* Source does not exist, cyclic rename, or mountpoint? */
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if (!old_dentry->d_inode || old_dentry == trap ||
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d_mountpoint(old_dentry))
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goto exit;
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dentry = lookup_one_len(new_name, new_dir, strlen(new_name));
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/* Lookup failed, cyclic rename or target exists? */
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if (IS_ERR(dentry) || dentry == trap || dentry->d_inode)
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goto exit;
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old_name = fsnotify_oldname_init(old_dentry->d_name.name);
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error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode,
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dentry);
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if (error) {
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fsnotify_oldname_free(old_name);
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goto exit;
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}
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d_move(old_dentry, dentry);
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fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name,
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old_dentry->d_name.name, S_ISDIR(old_dentry->d_inode->i_mode),
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NULL, old_dentry->d_inode);
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fsnotify_oldname_free(old_name);
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unlock_rename(new_dir, old_dir);
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dput(dentry);
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return old_dentry;
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exit:
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if (dentry && !IS_ERR(dentry))
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dput(dentry);
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unlock_rename(new_dir, old_dir);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(debugfs_rename);
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static decl_subsys(debug, NULL, NULL);
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static int __init debugfs_init(void)
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@ -38,6 +38,9 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
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void debugfs_remove(struct dentry *dentry);
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struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
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struct dentry *new_dir, const char *new_name);
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struct dentry *debugfs_create_u8(const char *name, mode_t mode,
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struct dentry *parent, u8 *value);
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struct dentry *debugfs_create_u16(const char *name, mode_t mode,
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@ -85,6 +88,12 @@ static inline struct dentry *debugfs_create_symlink(const char *name,
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static inline void debugfs_remove(struct dentry *dentry)
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{ }
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static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
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struct dentry *new_dir, char *new_name)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
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struct dentry *parent,
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u8 *value)
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