inode.h revision 283640
1/*- 2 * Copyright (c) 1982, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)inode.h 8.9 (Berkeley) 5/14/95 35 * $FreeBSD: stable/10/sys/ufs/ufs/inode.h 283640 2015-05-28 00:11:36Z mckusick $ 36 */ 37 38#ifndef _UFS_UFS_INODE_H_ 39#define _UFS_UFS_INODE_H_ 40 41#include <sys/lock.h> 42#include <sys/queue.h> 43#include <ufs/ufs/dinode.h> 44 45/* 46 * This must agree with the definition in <ufs/ufs/dir.h>. 47 */ 48#define doff_t int32_t 49 50/* 51 * The inode is used to describe each active (or recently active) file in the 52 * UFS filesystem. It is composed of two types of information. The first part 53 * is the information that is needed only while the file is active (such as 54 * the identity of the file and linkage to speed its lookup). The second part 55 * is the permanent meta-data associated with the file which is read in 56 * from the permanent dinode from long term storage when the file becomes 57 * active, and is put back when the file is no longer being used. 58 * 59 * An inode may only be changed while holding either the exclusive 60 * vnode lock or the shared vnode lock and the vnode interlock. We use 61 * the latter only for "read" and "get" operations that require 62 * changing i_flag, or a timestamp. This locking protocol allows executing 63 * those operations without having to upgrade the vnode lock from shared to 64 * exclusive. 65 */ 66struct inode { 67 TAILQ_ENTRY(inode) i_nextsnap; /* snapshot file list. */ 68 struct vnode *i_vnode;/* Vnode associated with this inode. */ 69 struct ufsmount *i_ump;/* Ufsmount point associated with this inode. */ 70 u_int32_t i_flag; /* flags, see below */ 71 struct cdev *i_dev; /* Device associated with the inode. */ 72 ino_t i_number; /* The identity of the inode. */ 73 int i_effnlink; /* i_nlink when I/O completes */ 74 75 struct fs *i_fs; /* Associated filesystem superblock. */ 76 struct dquot *i_dquot[MAXQUOTAS]; /* Dquot structures. */ 77 /* 78 * Side effects; used during directory lookup. 79 */ 80 int32_t i_count; /* Size of free slot in directory. */ 81 doff_t i_endoff; /* End of useful stuff in directory. */ 82 doff_t i_diroff; /* Offset in dir, where we found last entry. */ 83 doff_t i_offset; /* Offset of free space in directory. */ 84 85 union { 86 struct dirhash *dirhash; /* Hashing for large directories. */ 87 daddr_t *snapblklist; /* Collect expunged snapshot blocks. */ 88 } i_un; 89 90 int i_nextclustercg; /* last cg searched for cluster */ 91 92 /* 93 * Data for extended attribute modification. 94 */ 95 u_char *i_ea_area; /* Pointer to malloced copy of EA area */ 96 unsigned i_ea_len; /* Length of i_ea_area */ 97 int i_ea_error; /* First errno in transaction */ 98 int i_ea_refs; /* Number of users of EA area */ 99 100 /* 101 * Copies from the on-disk dinode itself. 102 */ 103 u_int16_t i_mode; /* IFMT, permissions; see below. */ 104 int16_t i_nlink; /* File link count. */ 105 u_int64_t i_size; /* File byte count. */ 106 u_int32_t i_flags; /* Status flags (chflags). */ 107 u_int64_t i_gen; /* Generation number. */ 108 u_int32_t i_uid; /* File owner. */ 109 u_int32_t i_gid; /* File group. */ 110 /* 111 * The real copy of the on-disk inode. 112 */ 113 union { 114 struct ufs1_dinode *din1; /* UFS1 on-disk dinode. */ 115 struct ufs2_dinode *din2; /* UFS2 on-disk dinode. */ 116 } dinode_u; 117}; 118/* 119 * These flags are kept in i_flag. 120 */ 121#define IN_ACCESS 0x0001 /* Access time update request. */ 122#define IN_CHANGE 0x0002 /* Inode change time update request. */ 123#define IN_UPDATE 0x0004 /* Modification time update request. */ 124#define IN_MODIFIED 0x0008 /* Inode has been modified. */ 125#define IN_NEEDSYNC 0x0010 /* Inode requires fsync. */ 126#define IN_LAZYMOD 0x0040 /* Modified, but don't write yet. */ 127#define IN_LAZYACCESS 0x0100 /* Process IN_ACCESS after the 128 suspension finished */ 129#define IN_EA_LOCKED 0x0200 130#define IN_EA_LOCKWAIT 0x0400 131 132#define IN_TRUNCATED 0x0800 /* Journaled truncation pending. */ 133 134#define i_devvp i_ump->um_devvp 135#define i_umbufobj i_ump->um_bo 136#define i_dirhash i_un.dirhash 137#define i_snapblklist i_un.snapblklist 138#define i_din1 dinode_u.din1 139#define i_din2 dinode_u.din2 140 141#ifdef _KERNEL 142/* 143 * The DIP macro is used to access fields in the dinode that are 144 * not cached in the inode itself. 145 */ 146#define DIP(ip, field) \ 147 (((ip)->i_ump->um_fstype == UFS1) ? \ 148 (ip)->i_din1->d##field : (ip)->i_din2->d##field) 149#define DIP_SET(ip, field, val) do { \ 150 if ((ip)->i_ump->um_fstype == UFS1) \ 151 (ip)->i_din1->d##field = (val); \ 152 else \ 153 (ip)->i_din2->d##field = (val); \ 154 } while (0) 155 156#define SHORTLINK(ip) \ 157 (((ip)->i_ump->um_fstype == UFS1) ? \ 158 (caddr_t)(ip)->i_din1->di_db : (caddr_t)(ip)->i_din2->di_db) 159#define IS_SNAPSHOT(ip) ((ip)->i_flags & SF_SNAPSHOT) 160 161/* 162 * Structure used to pass around logical block paths generated by 163 * ufs_getlbns and used by truncate and bmap code. 164 */ 165struct indir { 166 ufs2_daddr_t in_lbn; /* Logical block number. */ 167 int in_off; /* Offset in buffer. */ 168}; 169 170/* Convert between inode pointers and vnode pointers. */ 171#define VTOI(vp) ((struct inode *)(vp)->v_data) 172#define ITOV(ip) ((ip)->i_vnode) 173 174/* Determine if soft dependencies are being done */ 175#define DOINGSOFTDEP(vp) ((vp)->v_mount->mnt_flag & (MNT_SOFTDEP | MNT_SUJ)) 176#define MOUNTEDSOFTDEP(mp) ((mp)->mnt_flag & (MNT_SOFTDEP | MNT_SUJ)) 177#define DOINGSUJ(vp) ((vp)->v_mount->mnt_flag & MNT_SUJ) 178#define MOUNTEDSUJ(mp) ((mp)->mnt_flag & MNT_SUJ) 179 180/* This overlays the fid structure (see mount.h). */ 181struct ufid { 182 u_int16_t ufid_len; /* Length of structure. */ 183 u_int16_t ufid_pad; /* Force 32-bit alignment. */ 184 uint32_t ufid_ino; /* File number (ino). */ 185 uint32_t ufid_gen; /* Generation number. */ 186}; 187#endif /* _KERNEL */ 188 189#endif /* !_UFS_UFS_INODE_H_ */ 190