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/*
  Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
  This file is part of GlusterFS.

  GlusterFS is free software; you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published
  by the Free Software Foundation; either version 3 of the License,
  or (at your option) any later version.

  GlusterFS is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see
  <http://www.gnu.org/licenses/>.
*/


#ifndef _IATT_H
#define _IATT_H

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/stat.h> /* for iatt <--> stat conversions */
#include <unistd.h>

#include "compat.h"
#include "uuid.h"

typedef enum {
        IA_INVAL = 0,
        IA_IFREG,
        IA_IFDIR,
        IA_IFLNK,
        IA_IFBLK,
        IA_IFCHR,
        IA_IFIFO,
        IA_IFSOCK
} ia_type_t;


typedef struct {
        uint8_t    suid:1;
        uint8_t    sgid:1;
        uint8_t    sticky:1;
        struct {
                uint8_t    read:1;
                uint8_t    write:1;
                uint8_t    exec:1;
        } owner, group, other;
} ia_prot_t;


struct iatt {
        uint64_t     ia_ino;        /* inode number */
        uuid_t       ia_gfid;
        uint64_t     ia_dev;        /* backing device ID */
        ia_type_t    ia_type;       /* type of file */
        ia_prot_t    ia_prot;       /* protection */
        uint32_t     ia_nlink;      /* Link count */
        uint32_t     ia_uid;        /* user ID of owner */
        uint32_t     ia_gid;        /* group ID of owner */
        uint64_t     ia_rdev;       /* device ID (if special file) */
        uint64_t     ia_size;       /* file size in bytes */
        uint32_t     ia_blksize;    /* blocksize for filesystem I/O */
        uint64_t     ia_blocks;     /* number of 512B blocks allocated */
        uint32_t     ia_atime;      /* last access time */
        uint32_t     ia_atime_nsec;
        uint32_t     ia_mtime;      /* last modification time */
        uint32_t     ia_mtime_nsec;
        uint32_t     ia_ctime;      /* last status change time */
        uint32_t     ia_ctime_nsec;
};


#define IA_ISREG(t) (t == IA_IFREG)
#define IA_ISDIR(t) (t == IA_IFDIR)
#define IA_ISLNK(t) (t == IA_IFLNK)
#define IA_ISBLK(t) (t == IA_IFBLK)
#define IA_ISCHR(t) (t == IA_IFCHR)
#define IA_ISFIFO(t) (t == IA_IFIFO)
#define IA_ISSOCK(t) (t == IA_IFSOCK)

#define IA_PROT_RUSR(prot)      ((prot).owner.read == 1)
#define IA_PROT_WUSR(prot)      ((prot).owner.write == 1)
#define IA_PROT_XUSR(prot)      ((prot).owner.exec == 1)

#define IA_PROT_RGRP(prot)      ((prot).group.read == 1)
#define IA_PROT_WGRP(prot)      ((prot).group.write == 1)
#define IA_PROT_XGRP(prot)      ((prot).group.exec == 1)

#define IA_PROT_ROTH(prot)      ((prot).other.read == 1)
#define IA_PROT_WOTH(prot)      ((prot).other.write == 1)
#define IA_PROT_XOTH(prot)      ((prot).other.exec == 1)

#define IA_PROT_SUID(prot)      ((prot).suid == 1)
#define IA_PROT_SGID(prot)      ((prot).sgid == 1)
#define IA_PROT_STCKY(prot)     ((prot).sticky == 1)

static inline uint32_t
ia_major (uint64_t ia_dev)
{
        return (uint32_t) (ia_dev >> 32);
}


static inline uint32_t
ia_minor (uint64_t ia_dev)
{
        return (uint32_t) (ia_dev & 0xffffffff);
}


static inline uint64_t
ia_makedev (uint32_t ia_maj, uint32_t ia_min)
{
        return ((((uint64_t) ia_maj) << 32) & ia_min);
}


static inline ia_prot_t
ia_prot_from_st_mode (mode_t mode)
{
        ia_prot_t ia_prot = {0, };

        if (mode & S_ISUID)
                ia_prot.suid = 1;
        if (mode & S_ISGID)
                ia_prot.sgid = 1;
        if (mode & S_ISVTX)
                ia_prot.sticky = 1;

        if (mode & S_IRUSR)
                ia_prot.owner.read = 1;
        if (mode & S_IWUSR)
                ia_prot.owner.write = 1;
        if (mode & S_IXUSR)
                ia_prot.owner.exec = 1;

        if (mode & S_IRGRP)
                ia_prot.group.read = 1;
        if (mode & S_IWGRP)
                ia_prot.group.write = 1;
        if (mode & S_IXGRP)
                ia_prot.group.exec = 1;

        if (mode & S_IROTH)
                ia_prot.other.read = 1;
        if (mode & S_IWOTH)
                ia_prot.other.write = 1;
        if (mode & S_IXOTH)
                ia_prot.other.exec = 1;

        return ia_prot;
}


static inline ia_type_t
ia_type_from_st_mode (mode_t mode)
{
        ia_type_t type = IA_INVAL;

        if (S_ISREG (mode))
                type = IA_IFREG;
        if (S_ISDIR (mode))
                type = IA_IFDIR;
        if (S_ISLNK (mode))
                type = IA_IFLNK;
        if (S_ISBLK (mode))
                type = IA_IFBLK;
        if (S_ISCHR (mode))
                type = IA_IFCHR;
        if (S_ISFIFO (mode))
                type = IA_IFIFO;
        if (S_ISSOCK (mode))
                type = IA_IFSOCK;

        return type;
}


static inline mode_t
st_mode_from_ia (ia_prot_t prot, ia_type_t type)
{
        mode_t    st_mode = 0;
        uint32_t  type_bit = 0;
        uint32_t  prot_bit = 0;

        switch (type) {
        case IA_IFREG:
                type_bit = S_IFREG;
                break;
        case IA_IFDIR:
                type_bit = S_IFDIR;
                break;
        case IA_IFLNK:
                type_bit = S_IFLNK;
                break;
        case IA_IFBLK:
                type_bit = S_IFBLK;
                break;
        case IA_IFCHR:
                type_bit = S_IFCHR;
                break;
        case IA_IFIFO:
                type_bit = S_IFIFO;
                break;
        case IA_IFSOCK:
                type_bit = S_IFSOCK;
                break;
        case IA_INVAL:
                break;
        }

        if (prot.suid)
                prot_bit |= S_ISUID;
        if (prot.sgid)
                prot_bit |= S_ISGID;
        if (prot.sticky)
                prot_bit |= S_ISVTX;

        if (prot.owner.read)
                prot_bit |= S_IRUSR;
        if (prot.owner.write)
                prot_bit |= S_IWUSR;
        if (prot.owner.exec)
                prot_bit |= S_IXUSR;

        if (prot.group.read)
                prot_bit |= S_IRGRP;
        if (prot.group.write)
                prot_bit |= S_IWGRP;
        if (prot.group.exec)
                prot_bit |= S_IXGRP;

        if (prot.other.read)
                prot_bit |= S_IROTH;
        if (prot.other.write)
                prot_bit |= S_IWOTH;
        if (prot.other.exec)
                prot_bit |= S_IXOTH;

        st_mode = (type_bit | prot_bit);

        return st_mode;
}


static inline int
iatt_from_stat (struct iatt *iatt, struct stat *stat)
{
        iatt->ia_dev        = stat->st_dev;
        iatt->ia_ino        = stat->st_ino;

        iatt->ia_type       = ia_type_from_st_mode (stat->st_mode);
        iatt->ia_prot       = ia_prot_from_st_mode (stat->st_mode);