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inode.h

/*    $OpenBSD: inode.h,v 1.27 2004/07/13 21:04:29 millert Exp $  */
/*    $NetBSD: inode.h,v 1.8 1995/06/15 23:22:50 cgd Exp $  */

/*
 * Copyright (c) 1982, 1989, 1993
 *    The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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 University 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 REGENTS 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 REGENTS 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.
 *
 *    @(#)inode.h 8.5 (Berkeley) 7/8/94
 */

#include <sys/buf.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ext2fs/ext2fs_dinode.h>

/*
 * Per-filesystem inode extensions.
 */
struct ext2fs_inode_ext {
       ufs1_daddr_t     ext2fs_last_lblk; /* last logical block allocated */
       ufs1_daddr_t     ext2fs_last_blk; /* last block allocated on disk */
       u_int32_t  ext2fs_effective_uid; /* effective inode uid */
       u_int32_t  ext2fs_effective_gid; /* effective inode gid */
};

/*
 * The inode is used to describe each active (or recently active) file in the
 * UFS filesystem. It is composed of two types of information. The first part
 * is the information that is needed only while the file is active (such as
 * the identity of the file and linkage to speed its lookup). The second part
 * is * the permanent meta-data associated with the file which is read in
 * from the permanent dinode from long term storage when the file becomes
 * active, and is put back when the file is no longer being used.
 */
struct inode {
      LIST_ENTRY(inode) i_hash; /* Hash chain */
      struct      vnode  *i_vnode;/* Vnode associated with this inode. */
      struct      ufsmount *i_ump;
      u_int32_t i_flag; /* flags, see below */
      dev_t   i_dev;    /* Device associated with the inode. */
      ino_t   i_number; /* The identity of the inode. */
      int       i_effnlink;   /* i_nlink when I/O completes */

      union {                 /* Associated filesystem. */
            struct      fs *fs;                 /* FFS */
            struct      lfs *lfs;         /* LFS */
            struct  m_ext2fs *e2fs;       /* EXT2FS */
      } inode_u;
#define     i_fs  inode_u.fs
#define     i_lfs inode_u.lfs
#define i_e2fs  inode_u.e2fs

      struct   cluster_info i_ci;
      struct       dquot *i_dquot[MAXQUOTAS]; /* Dquot structures. */
      u_quad_t i_modrev;      /* Revision level for NFS lease. */
      struct       lockf *i_lockf;/* Head of byte-level lock list. */
      struct   lock i_lock;   /* Inode lock */

      /*
       * Side effects; used during directory lookup.
       */
      int32_t       i_count;  /* Size of free slot in directory. */
      doff_t        i_endoff; /* End of useful stuff in directory. */
      doff_t        i_diroff; /* Offset in dir, where we found last entry. */
      doff_t        i_offset; /* Offset of free space in directory. */
      ino_t   i_ino;    /* Inode number of found directory. */
      u_int32_t i_reclen;     /* Size of found directory entry. */
      /*
       * Inode extensions
       */
      union {
            /* Other extensions could go here... */
            struct ext2fs_inode_ext   e2fs;
            struct dirhash *dirhash;
      } inode_ext;

#define i_e2fs_last_lblk      inode_ext.e2fs.ext2fs_last_lblk
#define i_e2fs_last_blk       inode_ext.e2fs.ext2fs_last_blk
#define i_e2fs_uid            inode_ext.e2fs.ext2fs_effective_uid
#define i_e2fs_gid            inode_ext.e2fs.ext2fs_effective_gid
#define     i_dirhash         inode_ext.dirhash

      /*
       * The on-disk dinode itself.
       */
      union {
            struct ufs1_dinode ffs1_din;
            struct ext2fs_dinode e2fs_din;
      } dinode_u;
#define i_din1 dinode_u.ffs1_din
#define     i_e2din     dinode_u.e2fs_din

      struct inode_vtbl *i_vtbl;
};

struct inode_vtbl {
      int (* iv_truncate)(struct inode *, off_t, int, 
          struct ucred *);
      int (* iv_update)(struct inode *, struct timespec *, struct timespec *,
          int waitfor);
      int (* iv_inode_alloc)(struct inode *, mode_t mode, 
          struct ucred *, struct vnode **);
      int (* iv_inode_free)(struct inode *, ino_t ino, mode_t mode);
      int (* iv_buf_alloc)(struct inode *, off_t, int, struct ucred *,
          int, struct buf **);
      int (* iv_bufatoff)(struct inode *, off_t offset, char **res,
          struct buf **bpp);
};

#define UFS_TRUNCATE(ip, off, flags, cred) \
    ((ip)->i_vtbl->iv_truncate)((ip), (off), (flags), (cred))

#define UFS_UPDATE(ip, sync) \
    ((ip)->i_vtbl->iv_update)((ip), NULL, NULL, (sync))

#define UFS_UPDATE2(ip, atime, mtime, sync) \
    ((ip)->i_vtbl->iv_update)((ip), (atime), (mtime), (sync))

#define UFS_INODE_ALLOC(pip, mode, cred, vpp) \
    ((pip)->i_vtbl->iv_inode_alloc)((pip), (mode), (cred), (vpp))

#define UFS_INODE_FREE(pip, ino, mode) \
    ((pip)->i_vtbl->iv_inode_free)((pip), (ino), (mode))

#define UFS_BUF_ALLOC(ip, startoffset, size, cred, flags, bpp) \
    ((ip)->i_vtbl->iv_buf_alloc)((ip), (startoffset), (size), (cred), \
        (flags), (bpp))
 
#define UFS_BUFATOFF(ip, offset, res, bpp) \
    ((ip)->i_vtbl->iv_bufatoff)((ip), (offset), (res), (bpp))


#define     i_ffs_atime       i_din1.di_atime
#define     i_ffs_atimensec         i_din1.di_atimensec
#define     i_ffs_blocks            i_din1.di_blocks
#define     i_ffs_ctime       i_din1.di_ctime
#define     i_ffs_ctimensec         i_din1.di_ctimensec
#define     i_ffs_db          i_din1.di_db
#define     i_ffs_flags       i_din1.di_flags
#define     i_ffs_gen         i_din1.di_gen
#define     i_ffs_gid         i_din1.di_gid
#define     i_ffs_ib          i_din1.di_ib
#define     i_ffs_mode        i_din1.di_mode
#define     i_ffs_mtime       i_din1.di_mtime
#define     i_ffs_mtimensec         i_din1.di_mtimensec
#define     i_ffs_nlink       i_din1.di_nlink
#define     i_ffs_rdev        i_din1.di_rdev
#define     i_ffs_shortlink         i_din1.di_shortlink
#define     i_ffs_size        i_din1.di_size
#define     i_ffs_uid         i_din1.di_uid
#define i_size                i_din1.di_size

#ifndef _KERNEL
/*
 * These are here purely for backwards compatibility for userland.
 * They allow direct references to FFS structures using the old names.
 */

#define     i_atime                 i_din1.di_atime
#define     i_atimensec       i_din1.di_atimensec
#define     i_blocks          i_din1.di_blocks
#define     i_ctime                 i_din1.di_ctime
#define     i_ctimensec       i_din1.di_ctimensec
#define     i_db              i_din1.di_db
#define     i_flags                 i_din1.di_flags
#define     i_gen             i_din1.di_gen
#define     i_gid             i_din1.di_gid
#define     i_ib              i_din1.di_ib
#define     i_mode                  i_din1.di_mode
#define     i_mtime                 i_din1.di_mtime
#define     i_mtimensec       i_din1.di_mtimensec
#define     i_nlink                 i_din1.di_nlink
#define     i_rdev                  i_din1.di_rdev
#define     i_shortlink       i_din1.di_shortlink
#define     i_size                  i_din1.di_size
#define     i_uid             i_din1.di_uid
#endif      /* _KERNEL */

#define i_e2fs_mode           i_e2din.e2di_mode
#define i_e2fs_size           i_e2din.e2di_size
#define i_e2fs_atime          i_e2din.e2di_atime
#define i_e2fs_ctime          i_e2din.e2di_ctime
#define i_e2fs_mtime          i_e2din.e2di_mtime
#define i_e2fs_dtime          i_e2din.e2di_dtime
#define i_e2fs_nlink          i_e2din.e2di_nlink
#define i_e2fs_nblock         i_e2din.e2di_nblock
#define i_e2fs_flags          i_e2din.e2di_flags
#define i_e2fs_blocks         i_e2din.e2di_blocks
#define i_e2fs_gen            i_e2din.e2di_gen
#define i_e2fs_facl           i_e2din.e2di_facl
#define i_e2fs_dacl           i_e2din.e2di_dacl
#define i_e2fs_faddr          i_e2din.e2di_faddr
#define i_e2fs_nfrag          i_e2din.e2di_nfrag
#define i_e2fs_fsize          i_e2din.e2di_fsize
#define i_e2fs_uid_low        i_e2din.e2di_uid_low
#define i_e2fs_gid_low        i_e2din.e2di_gid_low
#define i_e2fs_uid_high       i_e2din.e2di_uid_high
#define i_e2fs_gid_high       i_e2din.e2di_gid_high

/* These flags are kept in i_flag. */
#define     IN_ACCESS   0x0001            /* Access time update request. */
#define     IN_CHANGE   0x0002            /* Inode change time update request. */
#define IN_UPDATE       0x0004          /* Modification time update request */
#define     IN_MODIFIED 0x0008            /* Inode has been modified. */
#define     IN_RENAME   0x0010            /* Inode is being renamed. */
#define IN_SHLOCK       0x0020          /* File has shared lock. */
#define     IN_EXLOCK   0x0040            /* File has exclusive lock. */

#define     i_devvp i_ump->um_devvp

#ifdef _KERNEL

/*
 * The DIP macro is used to access fields in the dinode that are
 * not cached in the inode itself.
 */
#define     DIP(ip, field) \
      (((ip)->i_ump->um_fstype == UM_UFS1) ? \
      (ip)->i_din1->d##field : (ip)->i_din2->d##field)

#if 0
#define     MAXSYMLINKLEN(ip) \
      ((ip)->i_ump->um_fstype == UM_UFS1) ? \
      ((NDADDR + NIADDR) * sizeof(ufs1_daddr_t)) : \
      ((NDADDR + NIADDR) * sizeof(ufs2_daddr_t))
#define     SHORTLINK(ip) \
      (((ip)->i_ump->um_fstype == UM_UFS1) ? \
      (caddr_t)(ip)->i_din1->di_db : (caddr_t)(ip)->i_din2->di_db)
#endif

/*
 * Structure used to pass around logical block paths generated by
 * ufs_getlbns and used by truncate and bmap code.
 */
struct indir {
      daddr_t in_lbn;               /* Logical block number. */
      int   in_off;                 /* Offset in buffer. */
      int   in_exists;        /* Flag if the block exists. */
};

/* Convert between inode pointers and vnode pointers. */
#define     VTOI(vp)    ((struct inode *)(vp)->v_data)
#define     ITOV(ip)    ((ip)->i_vnode)

#define     FFS_ITIMES(ip, t1, t2) {                              \
      if ((ip)->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) {   \
            (ip)->i_flag |= IN_MODIFIED;                    \
            if ((ip)->i_flag & IN_ACCESS)                   \
                  (ip)->i_ffs_atime = (t1)->tv_sec;         \
            if ((ip)->i_flag & IN_UPDATE) {                       \
                  (ip)->i_ffs_mtime = (t2)->tv_sec;         \
                  (ip)->i_modrev++;                   \
            }                                         \
            if ((ip)->i_flag & IN_CHANGE)                   \
                  (ip)->i_ffs_ctime = time.tv_sec;          \
            (ip)->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); \
      }                                               \
}

#define     EXT2FS_ITIMES(ip, t1, t2) {                           \
      if ((ip)->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) {   \
            (ip)->i_flag |= IN_MODIFIED;                    \
            if ((ip)->i_flag & IN_ACCESS)                   \
                  (ip)->i_e2fs_atime = (t1)->tv_sec;        \
            if ((ip)->i_flag & IN_UPDATE) {                       \
                  (ip)->i_e2fs_mtime = (t2)->tv_sec;        \
                  (ip)->i_modrev++;                   \
            }                                         \
            if ((ip)->i_flag & IN_CHANGE)                   \
                  (ip)->i_e2fs_ctime = time.tv_sec;         \
            (ip)->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); \
      }                                               \
}

#define ITIMES(ip, t1, t2) {                                \
      if (IS_EXT2_VNODE((ip)->i_vnode)) {                   \
            EXT2FS_ITIMES(ip, t1, t2);                      \
      } else {                                        \
            FFS_ITIMES(ip, t1, t2);                         \
      }                                               \
}

/* Determine if soft dependencies are being done */
#ifdef FFS_SOFTUPDATES
#define DOINGSOFTDEP(vp)      ((vp)->v_mount->mnt_flag & MNT_SOFTDEP)
#else
#define DOINGSOFTDEP(vp)      (0)
#endif
#define DOINGASYNC(vp)        ((vp)->v_mount->mnt_flag & MNT_ASYNC)

/* This overlays the fid structure (see mount.h). */
struct ufid {
      u_int16_t ufid_len;     /* Length of structure. */
      u_int16_t ufid_pad;     /* Force 32-bit alignment. */
      ino_t   ufid_ino; /* File number (ino). */
      int32_t       ufid_gen; /* Generation number. */
};
#endif /* _KERNEL */

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