xref: /kernel/liteos_m/components/fs/vfs/vfs_mount.h

/*
 * Copyright (c) 2022-2022 Huawei Device Co., Ltd. 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 copyright holder 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 HOLDER 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 _VFS_MOUNT_H_
#define _VFS_MOUNT_H_

#include "sys/statfs.h"
#include "los_compiler.h"

#ifdef __cplusplus
#if __cplusplus
extern "C" {
#endif /* __cplusplus */
#endif /* __cplusplus */

struct FsMap;
struct MountPoint;

struct MountOps {
    int (*mount)(struct MountPoint *mp, unsigned long mountflags,
                 const void *data);
    int (*umount)(struct MountPoint *mp);
    int (*umount2)(struct MountPoint *mp, int flag);
    int (*statfs)(const char *path, struct statfs *buf);
};

struct MountPoint {
    struct FsMap      *mFs;    /* file system info */
    struct MountPoint *mNext;  /* point to next mount point */
    const char        *mPath;  /* target path, /system, /usr, etc. */
    const char        *mDev;   /* device, "emmc0p0", "emmc0p1", etc. */
    UINT32             mRefs;  /* reference to mount point */
    void              *mData;  /* specific file system handle */
    BOOL               mWriteEnable; /* writable flag */
};

extern struct MountPoint *g_mountPoints;
#define LOS_MP_FOR_EACH_ENTRY(prev) \
        for (prev = g_mountPoints; prev != NULL; prev = prev->mNext)

struct MountPoint *VfsMpFind(const char *path, const char **pathInMp);

#ifdef __cplusplus
#if __cplusplus
}
#endif /* __cplusplus */
#endif /* __cplusplus */

#endif /* _VFS_MOUNT_H_ */