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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SYS_MOUNT_H_
#define _SYS_MOUNT_H_
#include <sys/queue.h>
#include <sys/syscall.h>
#include <sys/types.h>
#if defined(_KERNEL)
#include <os/vnode.h>
#endif /* defined(_KERNEL) */
/*
* Mount filesystem string names
*/
#define MOUNT_INITRD "initrd" /* Initial ramdisk */
#define MOUNT_DEVFS "devfs" /* Device filesystem */
/*
* The mount system call
*/
int mount(
const char *source, const char *target, const char *fstype,
unsigned long mountflags, void *data
);
#if defined(_KERNEL)
/*
* Number of bytes allowed in a filesystem
* name including the null termination
*/
#define FSNAME_MAX 16
/* Forward declarations */
struct fs_info;
struct vfsops;
struct mount;
/* Filesystem vfsops */
extern struct vfsops g_omar_vfsops;
extern struct vfsops g_devfs_vfops;
/*
* Represents a mountpoint
*
* @vp: Vnode of mount
* @fs: The filesystem backing this mountpoint
* @name: Mountname
* @link: TAILQ link
*/
struct mount {
struct vnode *vp;
struct fs_info *fs;
char name[FSNAME_MAX];
TAILQ_ENTRY(mount) link;
};
/*
* Represents a list of mountpoints
*
* @i: Initialized (set if initialized)
*/
struct mountlist {
uint8_t i : 1;
TAILQ_HEAD(, mount) list;
};
/*
* Arguments for mount()
*
* @vp_res: Vnode result
* @source: Specifies the source filesystem to mount
* @target: Specifies the location to mount source
* @fstype: File system type
* @data: Filesystem specific data
*/
struct mount_args {
struct vnode *vp_res;
const char *source;
const char *target;
const char *fstype;
const void *data;
};
/*
* Represents information about a filesystem
*
* @name: Filesystem type name
* @vfsops: VFS operations vector
* @attr: Attribute mask that may be set by fs
* @refcount: Mount count of this type
*
* XXX: The attributes mask is set by the filesystem and
* intended as an optimization to provide a way for
* filesystems set flags to modify behavior during
* things like the lookup stage.
*/
struct fs_info {
char name[FSNAME_MAX];
const struct vfsops *vfsops;
uint16_t attr;
int refcount;
};
/*
* Filesystem attributes mask
*/
#define FS_ATTR_IMAGE BIT(0) /* Is an image kind e.g., OSMORA OMAR */
/*
* VFS operations vector
*
* @init: Initialize the filesystem
* @mount: Mount a filesystem
*/
struct vfsops {
int(*init)(struct fs_info *fip);
int(*mount)(struct fs_info *fip, struct mount_args *margs);
};
/*
* Lookup a mountpoint existing on the system
*
* @name: Name of mountpoint
* @mp_res: Result of mountpoint is written here
*
* Returns zero on success, otherwise a less than zero
* value to indicate failure
*/
int mount_lookup(const char *name, struct mount **mp_res);
/*
* Mount a specific filesystem
*
* @margs: Mount arguments
* @flags: Mount flags
*
* Returns zero on success, otherwise a less than zero
* failure upon failure.
*/
int kmount(struct mount_args *margs, uint32_t flags);
/*
* Initialize a mountpoint to a known state
*
* @mp: Pointer to mountlist [if NULL, use root]
*
* Returns zero on success, otherwise a less than
* zero value on failure.
*/
int mountlist_init(struct mountlist *mlp);
/*
* Allocate a new mountpoint
*
* @name: The name to allocate mountpoint as
* @mp_res: Result pointer is written here
*
* Returns zero on success, otherwise a less than
* zero value to indicate failure.
*/
int mount_alloc(const char *name, struct mount **mp_res);
/*
* Mount system call
*/
scret_t sys_mount(struct syscall_args *scargs);
#endif /* !_KERNEL */
#endif /* !_SYS_MOUNT_H_ */
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