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the gating of system calls that cause modifications to the underlying filesystem. The gating can be enabled by any filesystem that needs to consistently suspend operations by adding the vop_stdgetwritemount to their set of vnops. Once gating is enabled, the function vfs_write_suspend stops all new write operations to a filesystem, allows any filesystem modifying system calls already in progress to complete, then sync's the filesystem to disk and returns. The function vfs_write_resume allows the suspended write operations to begin again. Gating is not added by default for all filesystems as for SMP systems it adds two extra locks to such critical kernel paths as the write system call. Thus, gating should only be added as needed. Details on the use and current status of snapshots in FFS can be found in /sys/ufs/ffs/README.snapshot so for brevity and timelyness is not included here. Unless and until you create a snapshot file, these changes should have no effect on your system (famous last words).
163 lines
6.4 KiB
C
163 lines
6.4 KiB
C
/*
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* Copyright (c) 1982, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)inode.h 8.9 (Berkeley) 5/14/95
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* $FreeBSD$
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*/
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#ifndef _UFS_UFS_INODE_H_
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#define _UFS_UFS_INODE_H_
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#include <sys/lock.h>
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#include <sys/queue.h>
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#include <ufs/ufs/dinode.h>
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/*
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* The size of a logical block number.
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*/
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typedef long ufs_lbn_t;
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/*
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* This must agree with the definition in <ufs/ufs/dir.h>.
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*/
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#define doff_t int32_t
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/*
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* The inode is used to describe each active (or recently active) file in the
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* UFS filesystem. It is composed of two types of information. The first part
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* is the information that is needed only while the file is active (such as
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* the identity of the file and linkage to speed its lookup). The second part
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* is the permanent meta-data associated with the file which is read in
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* from the permanent dinode from long term storage when the file becomes
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* active, and is put back when the file is no longer being used.
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*/
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struct inode {
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struct lock i_lock; /* Inode lock. >Keep this first< */
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LIST_ENTRY(inode) i_hash;/* Hash chain. */
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struct vnode *i_vnode;/* Vnode associated with this inode. */
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struct vnode *i_devvp;/* Vnode for block I/O. */
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u_int32_t i_flag; /* flags, see below */
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dev_t i_dev; /* Device associated with the inode. */
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ino_t i_number; /* The identity of the inode. */
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int i_effnlink; /* i_nlink when I/O completes */
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union { /* Associated filesystem. */
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struct fs *fs; /* FFS */
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struct ext2_sb_info *e2fs; /* EXT2FS */
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} inode_u;
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#define i_fs inode_u.fs
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#define i_e2fs inode_u.e2fs
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struct dquot *i_dquot[MAXQUOTAS]; /* Dquot structures. */
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u_quad_t i_modrev; /* Revision level for NFS lease. */
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struct lockf *i_lockf;/* Head of byte-level lock list. */
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struct inode *i_copyonwrite; /* copy-on-write list */
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/*
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* Side effects; used during directory lookup.
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*/
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int32_t i_count; /* Size of free slot in directory. */
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doff_t i_endoff; /* End of useful stuff in directory. */
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doff_t i_diroff; /* Offset in dir, where we found last entry. */
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doff_t i_offset; /* Offset of free space in directory. */
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ino_t i_ino; /* Inode number of found directory. */
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u_int32_t i_reclen; /* Size of found directory entry. */
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u_int32_t i_spare[4]; /* XXX actually non-spare (for ext2fs). */
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/*
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* The on-disk dinode itself.
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*/
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struct dinode i_din; /* 128 bytes of the on-disk dinode. */
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};
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#define i_atime i_din.di_atime
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#define i_atimensec i_din.di_atimensec
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#define i_blocks i_din.di_blocks
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#define i_ctime i_din.di_ctime
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#define i_ctimensec i_din.di_ctimensec
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#define i_db i_din.di_db
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#define i_flags i_din.di_flags
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#define i_gen i_din.di_gen
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#define i_gid i_din.di_gid
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#define i_ib i_din.di_ib
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#define i_mode i_din.di_mode
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#define i_mtime i_din.di_mtime
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#define i_mtimensec i_din.di_mtimensec
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#define i_nlink i_din.di_nlink
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#define i_rdev i_din.di_rdev
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#define i_shortlink i_din.di_shortlink
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#define i_size i_din.di_size
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#define i_uid i_din.di_uid
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/* These flags are kept in i_flag. */
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#define IN_ACCESS 0x0001 /* Access time update request. */
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#define IN_CHANGE 0x0002 /* Inode change time update request. */
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#define IN_UPDATE 0x0004 /* Modification time update request. */
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#define IN_MODIFIED 0x0008 /* Inode has been modified. */
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#define IN_RENAME 0x0010 /* Inode is being renamed. */
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#define IN_SHLOCK 0x0020 /* File has shared lock. */
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#define IN_EXLOCK 0x0040 /* File has exclusive lock. */
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#define IN_HASHED 0x0080 /* Inode is on hash list */
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#define IN_LAZYMOD 0x0100 /* Modified, but don't write yet. */
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#ifdef _KERNEL
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/*
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* Structure used to pass around logical block paths generated by
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* ufs_getlbns and used by truncate and bmap code.
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*/
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struct indir {
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ufs_daddr_t in_lbn; /* Logical block number. */
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int in_off; /* Offset in buffer. */
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int in_exists; /* Flag if the block exists. */
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};
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/* Convert between inode pointers and vnode pointers. */
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#define VTOI(vp) ((struct inode *)(vp)->v_data)
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#define ITOV(ip) ((ip)->i_vnode)
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/* Determine if soft dependencies are being done */
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#define DOINGSOFTDEP(vp) ((vp)->v_mount->mnt_flag & MNT_SOFTDEP)
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#define DOINGASYNC(vp) ((vp)->v_mount->mnt_flag & MNT_ASYNC)
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/* This overlays the fid structure (see mount.h). */
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struct ufid {
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u_int16_t ufid_len; /* Length of structure. */
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u_int16_t ufid_pad; /* Force 32-bit alignment. */
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ino_t ufid_ino; /* File number (ino). */
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int32_t ufid_gen; /* Generation number. */
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};
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#endif /* _KERNEL */
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#endif /* !_UFS_UFS_INODE_H_ */
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