/**
* relayfs_create_entry - create a relayfs directory or file
* @name: the name of the file to create
* @parent: parent directory
* @mode: mode
* @chan: relay channel associated with the file
*
* Returns the new dentry, NULL on failure
*
* Creates a file or directory with the specifed permissions.
*/
static struct dentry *relayfs_create_entry(const char *name,
struct dentry *parent,
int mode,
struct rchan *chan)
{
struct dentry *d;
struct inode *inode;
int error = 0;
BUG_ON(!name || !(S_ISREG(mode) || S_ISDIR(mode)));
error = simple_pin_fs("relayfs", &relayfs_mount, &relayfs_mount_count);
if (error) {
printk(KERN_ERR "Couldn't mount relayfs: errcode %d\n", error);
return NULL;
}
if (!parent && relayfs_mount && relayfs_mount->mnt_sb)
parent = relayfs_mount->mnt_sb->s_root;
if (!parent) {
simple_release_fs(&relayfs_mount, &relayfs_mount_count);
return NULL;
}
parent = dget(parent);
down(&parent->d_inode->i_sem);
d = lookup_one_len(name, parent, strlen(name));
if (IS_ERR(d)) {
d = NULL;
goto release_mount;
}
if (d->d_inode) {
d = NULL;
goto release_mount;
}
inode = relayfs_get_inode(parent->d_inode->i_sb, mode, chan);
if (!inode) {
d = NULL;
goto release_mount;
}
d_instantiate(d, inode);
dget(d); /* Extra count - pin the dentry in core */
if (S_ISDIR(mode))
parent->d_inode->i_nlink++;
goto exit;
release_mount:
simple_release_fs(&relayfs_mount, &relayfs_mount_count);
exit:
up(&parent->d_inode->i_sem);
dput(parent);
return d;
}
/**
* 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);
/*
* 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) {
/*
* 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);
}
static void drm_fs_inode_free(struct inode *inode)
{
if (inode) {
iput(inode);
simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
}
}
static void __exit myfs_exit(void)
{
myfs_registered = false;
simple_release_fs(&myfs_mount, &myfs_mount_count);
unregister_filesystem(&my_fs_type);
}
/**
* 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
* @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.
* @data: a pointer to something that the caller will want to get to later
* on. The inode.i_private pointer will point to this value on
* the open() call.
* @fops: a pointer to a struct file_operations that should be used for
* 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
* recommended to be used instead.)
*
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) 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_create_file(const char *name, mode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops)
{
struct dentry *dentry = NULL;
int error;
pr_debug("debugfs: creating file '%s'\n",name);
error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
&debugfs_mount_count);
if (error)
goto exit;
error = debugfs_create_by_name(name, mode, parent, &dentry);
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;
}
/**
* 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
* removed.
*
* This function removes a file or directory 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(struct dentry *dentry)
{
struct dentry *parent;
int ret = 0;
if (!dentry)
return;
parent = dentry->d_parent;
if (!parent || !parent->d_inode)
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);
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);
}
}
mutex_unlock(&parent->d_inode->i_mutex);
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}
/**
* securityfs_create_file - create a file in the securityfs filesystem
*
* @name: a pointer to a string containing the name of the file to create.
* @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 securityfs filesystem.
* @data: a pointer to something that the caller will want to get to later
* on. The inode.u.generic_ip pointer will point to this value on
* the open() call.
* @fops: a pointer to a struct file_operations that should be used for
* this file.
*
* This is the basic "create a file" function for securityfs. It allows for a
* wide range of flexibility in createing a file, or a directory (if you
* want to create a directory, the securityfs_create_dir() function is
* recommended to be used instead.)
*
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the securityfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, NULL will be returned.
*
* If securityfs is not enabled in the kernel, the value -ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* NULL or !NULL instead as to eliminate the need for #ifdef in the calling
* code.
*/
struct dentry *securityfs_create_file(const char *name, mode_t mode,
struct dentry *parent, void *data,
struct file_operations *fops)
{
struct dentry *dentry = NULL;
int error;
pr_debug("securityfs: creating file '%s'\n",name);
error = simple_pin_fs("securityfs", &mount, &mount_count);
if (error) {
dentry = ERR_PTR(error);
goto exit;
}
error = create_by_name(name, mode, parent, &dentry);
if (error) {
dentry = ERR_PTR(error);
simple_release_fs(&mount, &mount_count);
goto exit;
}
if (dentry->d_inode) {
if (fops)
dentry->d_inode->i_fop = fops;
if (data)
dentry->d_inode->u.generic_ip = data;
}
exit:
return dentry;
}
static void __exit debugfs_exit(void)
{
debugfs_registered = false;
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
unregister_filesystem(&debug_fs_type);
kobject_put(debug_kobj);
}
struct dentry *__create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops)
{
struct dentry *dentry = NULL;
int error;
pr_debug("debugfs: creating file '%s'\n",name);
error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
&debugfs_mount_count);
if (error)
goto exit;
/* 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
* block. A pointer to that is in the struct vfsmount that we
* have around.
*/
if (!parent)
parent = debugfs_mount->mnt_root;
dentry = NULL;
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(parent->d_inode, dentry, mode);
break;
case S_IFLNK:
error = debugfs_link(parent->d_inode, dentry, mode,
data);
break;
default:
error = debugfs_create(parent->d_inode, dentry, mode,
data, fops);
break;
}
dput(dentry);
} else
error = PTR_ERR(dentry);
mutex_unlock(&parent->d_inode->i_mutex);
if (error) {
dentry = NULL;
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}
exit:
return dentry;
}
struct dentry *capifs_new_ncci(unsigned int number, dev_t device)
{
struct dentry *dentry;
if (simple_pin_fs(&capifs_fs_type, &capifs_mnt, &capifs_mnt_count) < 0)
return NULL;
dentry = new_ncci(number, device);
if (!dentry)
simple_release_fs(&capifs_mnt, &capifs_mnt_count);
return dentry;
}
/**
* 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
* removed.
*
* This function removes a file or directory 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(struct dentry *dentry)
{
struct dentry *parent;
if (!dentry)
return;
parent = dentry->d_parent;
if (!parent || !parent->d_inode)
return;
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);
}
static struct inode *drm_fs_inode_new(void)
{
struct inode *inode;
int r;
r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
if (r < 0) {
DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
return ERR_PTR(r);
}
inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
if (IS_ERR(inode))
simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
return inode;
}
/**
* 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
* removed.
*
* This function removes a file or directory 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(struct dentry *dentry)
{
struct dentry *parent;
int ret;
if (IS_ERR_OR_NULL(dentry))
return;
parent = dentry->d_parent;
if (!parent || !parent->d_inode)
return;
mutex_lock(&parent->d_inode->i_mutex);
ret = __debugfs_remove(dentry, parent);
mutex_unlock(&parent->d_inode->i_mutex);
if (!ret)
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}
/**
* securityfs_remove - removes a file or directory from the securityfs filesystem
*
* @dentry: a pointer to a the dentry of the file or directory to be removed.
*
* This function removes a file or directory in securityfs that was previously
* created with a call to another securityfs function (like
* securityfs_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 securityfs_remove(struct dentry *dentry)
{
struct inode *dir;
if (!dentry || IS_ERR(dentry))
return;
dir = d_inode(dentry->d_parent);
inode_lock(dir);
if (simple_positive(dentry)) {
if (d_is_dir(dentry))
simple_rmdir(dir, dentry);
else
simple_unlink(dir, dentry);
dput(dentry);
}
inode_unlock(dir);
simple_release_fs(&mount, &mount_count);
}
static struct file *cxl_getfile(const char *name,
const struct file_operations *fops,
void *priv, int flags)
{
struct file *file;
struct inode *inode;
int rc;
/* strongly inspired by anon_inode_getfile() */
if (fops->owner && !try_module_get(fops->owner))
return ERR_PTR(-ENOENT);
rc = simple_pin_fs(&cxl_fs_type, &cxl_vfs_mount, &cxl_fs_cnt);
if (rc < 0) {
pr_err("Cannot mount cxl pseudo filesystem: %d\n", rc);
file = ERR_PTR(rc);
goto err_module;
}
inode = alloc_anon_inode(cxl_vfs_mount->mnt_sb);
if (IS_ERR(inode)) {
file = ERR_CAST(inode);
goto err_fs;
}
file = alloc_file_pseudo(inode, cxl_vfs_mount, name,
flags & (O_ACCMODE | O_NONBLOCK), fops);
if (IS_ERR(file))
goto err_inode;
file->private_data = priv;
return file;
err_inode:
iput(inode);
err_fs:
simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
err_module:
module_put(fops->owner);
return file;
}
/**
* relayfs_remove - remove a file or directory in the relay filesystem
* @dentry: file or directory dentry
*/
int relayfs_remove(struct dentry *dentry)
{
struct dentry *parent = dentry->d_parent;
if (!parent)
return -EINVAL;
parent = dget(parent);
down(&parent->d_inode->i_sem);
if (dentry->d_inode) {
simple_unlink(parent->d_inode, dentry);
d_delete(dentry);
}
dput(dentry);
up(&parent->d_inode->i_sem);
dput(parent);
simple_release_fs(&relayfs_mount, &relayfs_mount_count);
return 0;
}
/**
* securityfs_remove - removes a file or directory from the securityfs filesystem
*
* @dentry: a pointer to a the dentry of the file or directory to be removed.
*
* This function removes a file or directory in securityfs that was previously
* created with a call to another securityfs function (like
* securityfs_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 securityfs_remove(struct dentry *dentry)
{
struct dentry *parent;
if (!dentry || IS_ERR(dentry))
return;
parent = dentry->d_parent;
if (!parent || d_really_is_negative(parent))
return;
inode_lock(d_inode(parent));
if (simple_positive(dentry)) {
if (d_is_dir(dentry))
simple_rmdir(d_inode(parent), dentry);
else
simple_unlink(d_inode(parent), dentry);
dput(dentry);
}
inode_unlock(d_inode(parent));
simple_release_fs(&mount, &mount_count);
}
void capifs_free_ncci(struct dentry *dentry)
{
struct dentry *root = capifs_mnt->mnt_sb->s_root;
struct inode *inode;
if (!dentry)
return;
mutex_lock(&root->d_inode->i_mutex);
inode = dentry->d_inode;
if (inode) {
drop_nlink(inode);
d_delete(dentry);
dput(dentry);
}
dput(dentry);
mutex_unlock(&root->d_inode->i_mutex);
simple_release_fs(&capifs_mnt, &capifs_mnt_count);
}
/**
* securityfs_remove - removes a file or directory from the securityfs filesystem
*
* @dentry: a pointer to a the dentry of the file or directory to be removed.
*
* This function removes a file or directory in securityfs that was previously
* created with a call to another securityfs function (like
* securityfs_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 securityfs_remove(struct dentry *dentry)
{
struct dentry *parent;
if (!dentry || IS_ERR(dentry))
return;
parent = dentry->d_parent;
if (!parent || !parent->d_inode)
return;
mutex_lock(&parent->d_inode->i_mutex);
if (positive(dentry)) {
if (dentry->d_inode) {
if (S_ISDIR(dentry->d_inode->i_mode))
simple_rmdir(parent->d_inode, dentry);
else
simple_unlink(parent->d_inode, dentry);
dput(dentry);
}
}
mutex_unlock(&parent->d_inode->i_mutex);
simple_release_fs(&mount, &mount_count);
}
/**
* securityfs_create_file - create a file in the securityfs filesystem
*
* @name: a pointer to a string containing the name of the file to create.
* @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 parameter is %NULL, then the
* file will be created in the root of the securityfs filesystem.
* @data: a pointer to something that the caller will want to get to later
* on. The inode.i_private pointer will point to this value on
* the open() call.
* @fops: a pointer to a struct file_operations that should be used for
* this file.
*
* This is the basic "create a file" function for securityfs. It allows for a
* wide range of flexibility in creating a file, or a directory (if you
* want to create a directory, the securityfs_create_dir() function is
* recommended to be used instead).
*
* This function returns a pointer to a dentry if it succeeds. This
* pointer must be passed to the securityfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here). If an error occurs, the function will return
* the erorr value (via ERR_PTR).
*
* If securityfs is not enabled in the kernel, the value %-ENODEV is
* returned.
*/
struct dentry *securityfs_create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops)
{
struct dentry *dentry;
int is_dir = S_ISDIR(mode);
struct inode *dir, *inode;
int error;
if (!is_dir) {
BUG_ON(!fops);
mode = (mode & S_IALLUGO) | S_IFREG;
}
pr_debug("securityfs: creating file '%s'\n",name);
error = simple_pin_fs(&fs_type, &mount, &mount_count);
if (error)
return ERR_PTR(error);
if (!parent)
parent = mount->mnt_root;
dir = parent->d_inode;
mutex_lock(&dir->i_mutex);
dentry = lookup_one_len(name, parent, strlen(name));
if (IS_ERR(dentry))
goto out;
if (dentry->d_inode) {
error = -EEXIST;
goto out1;
}
inode = new_inode(dir->i_sb);
if (!inode) {
error = -ENOMEM;
goto out1;
}
inode->i_ino = get_next_ino();
inode->i_mode = mode;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_private = data;
if (is_dir) {
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
inc_nlink(inode);
inc_nlink(dir);
} else {
inode->i_fop = fops;
}
d_instantiate(dentry, inode);
dget(dentry);
mutex_unlock(&dir->i_mutex);
return dentry;
out1:
dput(dentry);
dentry = ERR_PTR(error);
out:
mutex_unlock(&dir->i_mutex);
simple_release_fs(&mount, &mount_count);
return dentry;
}
void cxl_release_mapping(struct cxl_context *ctx)
{
if (ctx->kernelapi && ctx->mapping)
simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
}
static void __exit aufs_exit(void)
{
simple_release_fs(&aufs_mount,&aufs_mount_count);
unregister_filesystem(&au_fs_type);
}
static void __exit debugfs_exit(void)
{
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
unregister_filesystem(&debug_fs_type);
subsystem_unregister(&debug_subsys);
}
void configfs_release_fs(void)
{
simple_release_fs(&configfs_mount, &configfs_mnt_count);
}
static void __exit securityfs_exit(void)
{
simple_release_fs(&mount, &mount_count);
unregister_filesystem(&fs_type);
subsystem_unregister(&security_subsys);
}
