/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_STATFS_H
#define _LINUX_STATFS_H

#include <linux/types.h>
#include <asm/statfs.h>
#include <asm/byteorder.h>

struct kstatfs {
        long f_type;
        long f_bsize;
        u64 f_blocks;
        u64 f_bfree;
        u64 f_bavail;
        u64 f_files;
        u64 f_ffree;
        __kernel_fsid_t f_fsid;
        long f_namelen;
        long f_frsize;
        long f_flags;
        long f_spare[4];
};

/*
 * Definitions for the flag in f_flag.
 *
 * Generally these flags are equivalent to the MS_ flags used in the mount
 * ABI.  The exception is ST_VALID which has the same value as MS_REMOUNT
 * which doesn't make any sense for statfs.
 */
#define ST_RDONLY       0x0001  /* mount read-only */
#define ST_NOSUID       0x0002  /* ignore suid and sgid bits */
#define ST_NODEV        0x0004  /* disallow access to device special files */
#define ST_NOEXEC       0x0008  /* disallow program execution */
#define ST_SYNCHRONOUS  0x0010  /* writes are synced at once */
#define ST_VALID        0x0020  /* f_flags support is implemented */
#define ST_MANDLOCK     0x0040  /* allow mandatory locks on an FS */
/* 0x0080 used for ST_WRITE in glibc */
/* 0x0100 used for ST_APPEND in glibc */
/* 0x0200 used for ST_IMMUTABLE in glibc */
#define ST_NOATIME      0x0400  /* do not update access times */
#define ST_NODIRATIME   0x0800  /* do not update directory access times */
#define ST_RELATIME     0x1000  /* update atime relative to mtime/ctime */
#define ST_NOSYMFOLLOW  0x2000  /* do not follow symlinks */

struct dentry;
extern int vfs_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid);

static inline __kernel_fsid_t u64_to_fsid(u64 v)
{
        return (__kernel_fsid_t){.val = {(u32)v, (u32)(v>>32)}};
}

/* Fold 16 bytes uuid to 64 bit fsid */
static inline __kernel_fsid_t uuid_to_fsid(__u8 *uuid)
{
        return u64_to_fsid(le64_to_cpup((void *)uuid) ^
                le64_to_cpup((void *)(uuid + sizeof(u64))));
}

#endif