linux/fs/kernfs/inode.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * fs/kernfs/inode.c - kernfs inode implementation
 *
 * Copyright (c) 2001-3 Patrick Mochel
 * Copyright (c) 2007 SUSE Linux Products GmbH
 * Copyright (c) 2007, 2013 Tejun Heo <[email protected]>
 */

#include <linux/pagemap.h>
#include <linux/backing-dev.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/security.h>

#include "kernfs-internal.h"

static const struct inode_operations kernfs_iops = …;

static struct kernfs_iattrs *__kernfs_iattrs(struct kernfs_node *kn, int alloc)
{ … }

static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
{ … }

static struct kernfs_iattrs *kernfs_iattrs_noalloc(struct kernfs_node *kn)
{ … }

int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr)
{ … }

/**
 * kernfs_setattr - set iattr on a node
 * @kn: target node
 * @iattr: iattr to set
 *
 * Return: %0 on success, -errno on failure.
 */
int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr)
{ … }

int kernfs_iop_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
		       struct iattr *iattr)
{ … }

ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size)
{ … }

static inline void set_default_inode_attr(struct inode *inode, umode_t mode)
{ … }

static inline void set_inode_attr(struct inode *inode,
				  struct kernfs_iattrs *attrs)
{ … }

static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode)
{ … }

int kernfs_iop_getattr(struct mnt_idmap *idmap,
		       const struct path *path, struct kstat *stat,
		       u32 request_mask, unsigned int query_flags)
{ … }

static void kernfs_init_inode(struct kernfs_node *kn, struct inode *inode)
{ … }

/**
 *	kernfs_get_inode - get inode for kernfs_node
 *	@sb: super block
 *	@kn: kernfs_node to allocate inode for
 *
 *	Get inode for @kn.  If such inode doesn't exist, a new inode is
 *	allocated and basics are initialized.  New inode is returned
 *	locked.
 *
 *	Locking:
 *	Kernel thread context (may sleep).
 *
 *	Return:
 *	Pointer to allocated inode on success, %NULL on failure.
 */
struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn)
{ … }

/*
 * The kernfs_node serves as both an inode and a directory entry for
 * kernfs.  To prevent the kernfs inode numbers from being freed
 * prematurely we take a reference to kernfs_node from the kernfs inode.  A
 * super_operations.evict_inode() implementation is needed to drop that
 * reference upon inode destruction.
 */
void kernfs_evict_inode(struct inode *inode)
{ … }

int kernfs_iop_permission(struct mnt_idmap *idmap,
			  struct inode *inode, int mask)
{ … }

int kernfs_xattr_get(struct kernfs_node *kn, const char *name,
		     void *value, size_t size)
{ … }

int kernfs_xattr_set(struct kernfs_node *kn, const char *name,
		     const void *value, size_t size, int flags)
{ … }

static int kernfs_vfs_xattr_get(const struct xattr_handler *handler,
				struct dentry *unused, struct inode *inode,
				const char *suffix, void *value, size_t size)
{ … }

static int kernfs_vfs_xattr_set(const struct xattr_handler *handler,
				struct mnt_idmap *idmap,
				struct dentry *unused, struct inode *inode,
				const char *suffix, const void *value,
				size_t size, int flags)
{ … }

static int kernfs_vfs_user_xattr_add(struct kernfs_node *kn,
				     const char *full_name,
				     struct simple_xattrs *xattrs,
				     const void *value, size_t size, int flags)
{ … }

static int kernfs_vfs_user_xattr_rm(struct kernfs_node *kn,
				    const char *full_name,
				    struct simple_xattrs *xattrs,
				    const void *value, size_t size, int flags)
{ … }

static int kernfs_vfs_user_xattr_set(const struct xattr_handler *handler,
				     struct mnt_idmap *idmap,
				     struct dentry *unused, struct inode *inode,
				     const char *suffix, const void *value,
				     size_t size, int flags)
{ … }

static const struct xattr_handler kernfs_trusted_xattr_handler = …;

static const struct xattr_handler kernfs_security_xattr_handler = …;

static const struct xattr_handler kernfs_user_xattr_handler = …;

const struct xattr_handler * const kernfs_xattr_handlers[] = …;