linux/fs/smb/client/namespace.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Contains mounting routines used for handling traversal via SMB junctions.
 *
 *   Copyright (c) 2007 Igor Mammedov
 *   Copyright (C) International Business Machines  Corp., 2008
 *   Author(s): Igor Mammedov ([email protected])
 *		Steve French ([email protected])
 *   Copyright (c) 2023 Paulo Alcantara <[email protected]>
 */

#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/vfs.h>
#include <linux/fs.h>
#include <linux/inet.h>
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifsfs.h"
#include "cifs_debug.h"
#include "fs_context.h"

static LIST_HEAD(cifs_automount_list);

static void cifs_expire_automounts(struct work_struct *work);
static DECLARE_DELAYED_WORK(cifs_automount_task,
			    cifs_expire_automounts);
static int cifs_mountpoint_expiry_timeout = …;

static void cifs_expire_automounts(struct work_struct *work)
{ … }

void cifs_release_automount_timer(void)
{ … }

/**
 * cifs_build_devname - build a devicename from a UNC and optional prepath
 * @nodename:	pointer to UNC string
 * @prepath:	pointer to prefixpath (or NULL if there isn't one)
 *
 * Build a new cifs devicename after chasing a DFS referral. Allocate a buffer
 * big enough to hold the final thing. Copy the UNC from the nodename, and
 * concatenate the prepath onto the end of it if there is one.
 *
 * Returns pointer to the built string, or a ERR_PTR. Caller is responsible
 * for freeing the returned string.
 */
char *
cifs_build_devname(char *nodename, const char *prepath)
{ … }

static bool is_dfs_mount(struct dentry *dentry)
{ … }

/* Return full path out of a dentry set for automount */
static char *automount_fullpath(struct dentry *dentry, void *page)
{ … }

static void fs_context_set_ids(struct smb3_fs_context *ctx)
{ … }

/*
 * Create a vfsmount that we can automount
 */
static struct vfsmount *cifs_do_automount(struct path *path)
{ … }

/*
 * Attempt to automount the referral
 */
struct vfsmount *cifs_d_automount(struct path *path)
{ … }

const struct inode_operations cifs_namespace_inode_operations = …;