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| Current File : //usr/src/sys/ufs/ufs/inode.h |
/*-
* 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.
* 4. 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 8.9 (Berkeley) 5/14/95
* $FreeBSD: release/9.1.0/sys/ufs/ufs/inode.h 233630 2012-03-28 21:34:55Z mckusick $
*/
#ifndef _UFS_UFS_INODE_H_
#define _UFS_UFS_INODE_H_
#include <sys/lock.h>
#include <sys/queue.h>
#include <ufs/ufs/dinode.h>
/*
* This must agree with the definition in <ufs/ufs/dir.h>.
*/
#define doff_t int32_t
/*
* 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.
*
* An inode may only be changed while holding either the exclusive
* vnode lock or the shared vnode lock and the vnode interlock. We use
* the latter only for "read" and "get" operations that require
* changing i_flag, or a timestamp. This locking protocol allows executing
* those operations without having to upgrade the vnode lock from shared to
* exclusive.
*/
struct inode {
TAILQ_ENTRY(inode) i_nextsnap; /* snapshot file list. */
struct vnode *i_vnode;/* Vnode associated with this inode. */
struct ufsmount *i_ump;/* Ufsmount point associated with this inode. */
u_int32_t i_flag; /* flags, see below */
struct cdev *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 */
struct fs *i_fs; /* Associated filesystem superblock. */
struct dquot *i_dquot[MAXQUOTAS]; /* Dquot structures. */
/*
* 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. */
union {
struct dirhash *dirhash; /* Hashing for large directories. */
daddr_t *snapblklist; /* Collect expunged snapshot blocks. */
} i_un;
/*
* Data for extended attribute modification.
*/
u_char *i_ea_area; /* Pointer to malloced copy of EA area */
unsigned i_ea_len; /* Length of i_ea_area */
int i_ea_error; /* First errno in transaction */
int i_ea_refs; /* Number of users of EA area */
/*
* Copies from the on-disk dinode itself.
*/
u_int16_t i_mode; /* IFMT, permissions; see below. */
int16_t i_nlink; /* File link count. */
u_int64_t i_size; /* File byte count. */
u_int32_t i_flags; /* Status flags (chflags). */
int64_t i_gen; /* Generation number. */
u_int32_t i_uid; /* File owner. */
u_int32_t i_gid; /* File group. */
/*
* The real copy of the on-disk inode.
*/
union {
struct ufs1_dinode *din1; /* UFS1 on-disk dinode. */
struct ufs2_dinode *din2; /* UFS2 on-disk dinode. */
} dinode_u;
};
/*
* 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_NEEDSYNC 0x0010 /* Inode requires fsync. */
#define IN_LAZYMOD 0x0040 /* Modified, but don't write yet. */
#define IN_LAZYACCESS 0x0100 /* Process IN_ACCESS after the
suspension finished */
#define IN_EA_LOCKED 0x0200
#define IN_EA_LOCKWAIT 0x0400
#define IN_TRUNCATED 0x0800 /* Journaled truncation pending. */
#define i_devvp i_ump->um_devvp
#define i_umbufobj i_ump->um_bo
#define i_dirhash i_un.dirhash
#define i_snapblklist i_un.snapblklist
#define i_din1 dinode_u.din1
#define i_din2 dinode_u.din2
#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 == UFS1) ? \
(ip)->i_din1->d##field : (ip)->i_din2->d##field)
#define DIP_SET(ip, field, val) do { \
if ((ip)->i_ump->um_fstype == UFS1) \
(ip)->i_din1->d##field = (val); \
else \
(ip)->i_din2->d##field = (val); \
} while (0)
#define MAXSYMLINKLEN(ip) \
((ip)->i_ump->um_fstype == UFS1) ? \
((NDADDR + NIADDR) * sizeof(ufs1_daddr_t)) : \
((NDADDR + NIADDR) * sizeof(ufs2_daddr_t))
#define SHORTLINK(ip) \
(((ip)->i_ump->um_fstype == UFS1) ? \
(caddr_t)(ip)->i_din1->di_db : (caddr_t)(ip)->i_din2->di_db)
#define IS_SNAPSHOT(ip) ((ip)->i_flags & SF_SNAPSHOT)
/*
* Structure used to pass around logical block paths generated by
* ufs_getlbns and used by truncate and bmap code.
*/
struct indir {
ufs2_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)
/* Determine if soft dependencies are being done */
#define DOINGSOFTDEP(vp) ((vp)->v_mount->mnt_flag & (MNT_SOFTDEP | MNT_SUJ))
#define MOUNTEDSOFTDEP(mp) ((mp)->mnt_flag & (MNT_SOFTDEP | MNT_SUJ))
#define DOINGSUJ(vp) ((vp)->v_mount->mnt_flag & MNT_SUJ)
#define MOUNTEDSUJ(mp) ((mp)->mnt_flag & MNT_SUJ)
/* 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 */
#endif /* !_UFS_UFS_INODE_H_ */