/*
- * file.c - part of debugfs, a tiny little debug file system
+ * inode.c - part of debugfs, a tiny little debug file system
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004 IBM Inc.
*
*/
-/* uncomment to get debug messages from the debug filesystem, ah the irony. */
-/* #define DEBUG */
-
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/debugfs.h>
#include <linux/fsnotify.h>
#include <linux/string.h>
-
-#define DEBUGFS_MAGIC 0x64626720
-
-/* declared over in file.c */
-extern struct file_operations debugfs_file_operations;
-extern struct inode_operations debugfs_link_operations;
+#include <linux/magic.h>
+#include <linux/slab.h>
static struct vfsmount *debugfs_mount;
static int debugfs_mount_count;
+static bool debugfs_registered;
+
+static struct inode *debugfs_get_inode(struct super_block *sb, umode_t mode, dev_t dev,
+ void *data, const struct file_operations *fops)
-static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev)
{
struct inode *inode = new_inode(sb);
if (inode) {
+ inode->i_ino = get_next_ino();
inode->i_mode = mode;
- inode->i_uid = 0;
- inode->i_gid = 0;
- inode->i_blocks = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
default:
init_special_inode(inode, mode, dev);
break;
case S_IFREG:
- inode->i_fop = &debugfs_file_operations;
+ inode->i_fop = fops ? fops : &debugfs_file_operations;
+ inode->i_private = data;
break;
case S_IFLNK:
inode->i_op = &debugfs_link_operations;
+ inode->i_fop = fops;
+ inode->i_private = data;
break;
case S_IFDIR:
inode->i_op = &simple_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
+ inode->i_fop = fops ? fops : &simple_dir_operations;
+ inode->i_private = data;
/* directory inodes start off with i_nlink == 2
* (for "." entry) */
/* SMP-safe */
static int debugfs_mknod(struct inode *dir, struct dentry *dentry,
- int mode, dev_t dev)
+ umode_t mode, dev_t dev, void *data,
+ const struct file_operations *fops)
{
struct inode *inode;
int error = -EPERM;
if (dentry->d_inode)
return -EEXIST;
- inode = debugfs_get_inode(dir->i_sb, mode, dev);
+ inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops);
if (inode) {
d_instantiate(dentry, inode);
dget(dentry);
return error;
}
-static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode,
+ void *data, const struct file_operations *fops)
{
int res;
mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
- res = debugfs_mknod(dir, dentry, mode, 0);
+ res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
if (!res) {
inc_nlink(dir);
fsnotify_mkdir(dir, dentry);
return res;
}
-static int debugfs_link(struct inode *dir, struct dentry *dentry, int mode)
+static int debugfs_link(struct inode *dir, struct dentry *dentry, umode_t mode,
+ void *data, const struct file_operations *fops)
{
mode = (mode & S_IALLUGO) | S_IFLNK;
- return debugfs_mknod(dir, dentry, mode, 0);
+ return debugfs_mknod(dir, dentry, mode, 0, data, fops);
}
-static int debugfs_create(struct inode *dir, struct dentry *dentry, int mode)
+static int debugfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ void *data, const struct file_operations *fops)
{
int res;
mode = (mode & S_IALLUGO) | S_IFREG;
- res = debugfs_mknod(dir, dentry, mode, 0);
+ res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
if (!res)
fsnotify_create(dir, dentry);
return res;
return simple_fill_super(sb, DEBUGFS_MAGIC, debug_files);
}
-static int debug_get_sb(struct file_system_type *fs_type,
+static struct dentry *debug_mount(struct file_system_type *fs_type,
int flags, const char *dev_name,
- void *data, struct vfsmount *mnt)
+ void *data)
{
- return get_sb_single(fs_type, flags, data, debug_fill_super, mnt);
+ return mount_single(fs_type, flags, data, debug_fill_super);
}
static struct file_system_type debug_fs_type = {
.owner = THIS_MODULE,
.name = "debugfs",
- .get_sb = debug_get_sb,
+ .mount = debug_mount,
.kill_sb = kill_litter_super,
};
-static int debugfs_create_by_name(const char *name, mode_t mode,
+static int debugfs_create_by_name(const char *name, umode_t mode,
struct dentry *parent,
- struct dentry **dentry)
+ struct dentry **dentry,
+ void *data,
+ const struct file_operations *fops)
{
int error = 0;
* block. A pointer to that is in the struct vfsmount that we
* have around.
*/
- if (!parent) {
- if (debugfs_mount && debugfs_mount->mnt_sb) {
- parent = debugfs_mount->mnt_sb->s_root;
- }
- }
- if (!parent) {
- pr_debug("debugfs: Ah! can not find a parent!\n");
- return -EFAULT;
- }
+ if (!parent)
+ parent = debugfs_mount->mnt_root;
*dentry = NULL;
mutex_lock(&parent->d_inode->i_mutex);
if (!IS_ERR(*dentry)) {
switch (mode & S_IFMT) {
case S_IFDIR:
- error = debugfs_mkdir(parent->d_inode, *dentry, mode);
+ error = debugfs_mkdir(parent->d_inode, *dentry, mode,
+ data, fops);
break;
case S_IFLNK:
- error = debugfs_link(parent->d_inode, *dentry, mode);
+ error = debugfs_link(parent->d_inode, *dentry, mode,
+ data, fops);
break;
default:
- error = debugfs_create(parent->d_inode, *dentry, mode);
+ error = debugfs_create(parent->d_inode, *dentry, mode,
+ data, fops);
break;
}
dput(*dentry);
/**
* debugfs_create_file - create a file in the debugfs filesystem
* @name: a pointer to a string containing the name of the file to create.
- * @mode: the permission that the file should have
+ * @mode: the permission that the file should have.
* @parent: a pointer to the parent dentry for this file. This should be a
* directory dentry if set. If this paramater is NULL, then the
* file will be created in the root of the debugfs filesystem.
* this file.
*
* This is the basic "create a file" function for debugfs. It allows for a
- * wide range of flexibility in createing a file, or a directory (if you
- * want to create a directory, the debugfs_create_dir() function is
+ * wide range of flexibility in creating a file, or a directory (if you want
+ * to create a directory, the debugfs_create_dir() function is
* recommended to be used instead.)
*
* This function will return a pointer to a dentry if it succeeds. This
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned.
*/
-struct dentry *debugfs_create_file(const char *name, mode_t mode,
+struct dentry *debugfs_create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops)
{
if (error)
goto exit;
- error = debugfs_create_by_name(name, mode, parent, &dentry);
+ error = debugfs_create_by_name(name, mode, parent, &dentry,
+ data, fops);
if (error) {
dentry = NULL;
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
goto exit;
}
-
- if (dentry->d_inode) {
- if (data)
- dentry->d_inode->i_private = data;
- if (fops)
- dentry->d_inode->i_fop = fops;
- }
exit:
return dentry;
}
}
EXPORT_SYMBOL_GPL(debugfs_create_symlink);
+static int __debugfs_remove(struct dentry *dentry, struct dentry *parent)
+{
+ int ret = 0;
+
+ if (debugfs_positive(dentry)) {
+ if (dentry->d_inode) {
+ dget(dentry);
+ switch (dentry->d_inode->i_mode & S_IFMT) {
+ case S_IFDIR:
+ ret = simple_rmdir(parent->d_inode, dentry);
+ break;
+ case S_IFLNK:
+ kfree(dentry->d_inode->i_private);
+ /* fall through */
+ default:
+ simple_unlink(parent->d_inode, dentry);
+ break;
+ }
+ if (!ret)
+ d_delete(dentry);
+ dput(dentry);
+ }
+ }
+ return ret;
+}
+
/**
* debugfs_remove - removes a file or directory from the debugfs filesystem
* @dentry: a pointer to a the dentry of the file or directory to be
void debugfs_remove(struct dentry *dentry)
{
struct dentry *parent;
- int ret = 0;
-
+ int ret;
+
if (!dentry)
return;
return;
mutex_lock(&parent->d_inode->i_mutex);
- if (debugfs_positive(dentry)) {
- if (dentry->d_inode) {
- dget(dentry);
- switch (dentry->d_inode->i_mode & S_IFMT) {
- case S_IFDIR:
- ret = simple_rmdir(parent->d_inode, dentry);
- if (ret)
- printk(KERN_ERR
- "DebugFS rmdir on %s failed : "
- "directory not empty.\n",
- dentry->d_name.name);
- break;
- case S_IFLNK:
- kfree(dentry->d_inode->i_private);
- /* fall through */
- default:
- simple_unlink(parent->d_inode, dentry);
+ ret = __debugfs_remove(dentry, parent);
+ mutex_unlock(&parent->d_inode->i_mutex);
+ if (!ret)
+ simple_release_fs(&debugfs_mount, &debugfs_mount_count);
+}
+EXPORT_SYMBOL_GPL(debugfs_remove);
+
+/**
+ * debugfs_remove_recursive - recursively removes a directory
+ * @dentry: a pointer to a the dentry of the directory to be removed.
+ *
+ * This function recursively removes a directory tree in debugfs that
+ * was previously created with a call to another debugfs function
+ * (like debugfs_create_file() or variants thereof.)
+ *
+ * This function is required to be called in order for the file to be
+ * removed, no automatic cleanup of files will happen when a module is
+ * removed, you are responsible here.
+ */
+void debugfs_remove_recursive(struct dentry *dentry)
+{
+ struct dentry *child;
+ struct dentry *parent;
+
+ if (!dentry)
+ return;
+
+ parent = dentry->d_parent;
+ if (!parent || !parent->d_inode)
+ return;
+
+ parent = dentry;
+ mutex_lock(&parent->d_inode->i_mutex);
+
+ while (1) {
+ /*
+ * When all dentries under "parent" has been removed,
+ * walk up the tree until we reach our starting point.
+ */
+ if (list_empty(&parent->d_subdirs)) {
+ mutex_unlock(&parent->d_inode->i_mutex);
+ if (parent == dentry)
break;
+ parent = parent->d_parent;
+ mutex_lock(&parent->d_inode->i_mutex);
+ }
+ child = list_entry(parent->d_subdirs.next, struct dentry,
+ d_u.d_child);
+ next_sibling:
+
+ /*
+ * If "child" isn't empty, walk down the tree and
+ * remove all its descendants first.
+ */
+ if (!list_empty(&child->d_subdirs)) {
+ mutex_unlock(&parent->d_inode->i_mutex);
+ parent = child;
+ mutex_lock(&parent->d_inode->i_mutex);
+ continue;
+ }
+ __debugfs_remove(child, parent);
+ if (parent->d_subdirs.next == &child->d_u.d_child) {
+ /*
+ * Try the next sibling.
+ */
+ if (child->d_u.d_child.next != &parent->d_subdirs) {
+ child = list_entry(child->d_u.d_child.next,
+ struct dentry,
+ d_u.d_child);
+ goto next_sibling;
}
- if (!ret)
- d_delete(dentry);
- dput(dentry);
+
+ /*
+ * Avoid infinite loop if we fail to remove
+ * one dentry.
+ */
+ mutex_unlock(&parent->d_inode->i_mutex);
+ break;
}
+ simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}
+
+ parent = dentry->d_parent;
+ mutex_lock(&parent->d_inode->i_mutex);
+ __debugfs_remove(dentry, parent);
mutex_unlock(&parent->d_inode->i_mutex);
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}
-EXPORT_SYMBOL_GPL(debugfs_remove);
+EXPORT_SYMBOL_GPL(debugfs_remove_recursive);
/**
* debugfs_rename - rename a file/directory in the debugfs filesystem
}
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);
+ S_ISDIR(old_dentry->d_inode->i_mode),
+ NULL, old_dentry);
fsnotify_oldname_free(old_name);
unlock_rename(new_dir, old_dir);
dput(dentry);
}
EXPORT_SYMBOL_GPL(debugfs_rename);
-static decl_subsys(debug, NULL, NULL);
+/**
+ * debugfs_initialized - Tells whether debugfs has been registered
+ */
+bool debugfs_initialized(void)
+{
+ return debugfs_registered;
+}
+EXPORT_SYMBOL_GPL(debugfs_initialized);
+
+
+static struct kobject *debug_kobj;
static int __init debugfs_init(void)
{
int retval;
- kobj_set_kset_s(&debug_subsys, kernel_subsys);
- retval = subsystem_register(&debug_subsys);
- if (retval)
- return retval;
+ debug_kobj = kobject_create_and_add("debug", kernel_kobj);
+ if (!debug_kobj)
+ return -EINVAL;
retval = register_filesystem(&debug_fs_type);
if (retval)
- subsystem_unregister(&debug_subsys);
- return retval;
-}
+ kobject_put(debug_kobj);
+ else
+ debugfs_registered = true;
-static void __exit debugfs_exit(void)
-{
- simple_release_fs(&debugfs_mount, &debugfs_mount_count);
- unregister_filesystem(&debug_fs_type);
- subsystem_unregister(&debug_subsys);
+ return retval;
}
-
core_initcall(debugfs_init);
-module_exit(debugfs_exit);
-MODULE_LICENSE("GPL");
projects / linux-3.10.git / blobdiff