freebsd/sys/ufs/lfs/lfs_vnops.c

/*
 * Copyright (c) 1986, 1989, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 *
 *	@(#)lfs_vnops.c	8.5 (Berkeley) 12/30/93
 * $Id: lfs_vnops.c,v 1.16 1995/12/07 12:47:56 davidg Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/malloc.h>

#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_prot.h>
#include <vm/vm_page.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>

#include <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>

#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>

static int	 lfs_close __P((struct vop_close_args *));
static int	 lfs_fsync __P((struct vop_fsync_args *));
static int	 lfs_getattr __P((struct vop_getattr_args *));
static int	 lfs_inactive __P((struct vop_inactive_args *));
static int	 lfs_read __P((struct vop_read_args *));
static int	 lfs_write __P((struct vop_write_args *));


/* Global vfs data structures for lfs. */
vop_t **lfs_vnodeop_p;
static struct vnodeopv_entry_desc lfs_vnodeop_entries[] = {
	{ &vop_default_desc, (vop_t *)vn_default_error },
	{ &vop_lookup_desc, (vop_t *)ufs_lookup },	/* lookup */
	{ &vop_create_desc, (vop_t *)ufs_create },	/* create */
	{ &vop_mknod_desc, (vop_t *)ufs_mknod },	/* mknod */
	{ &vop_open_desc, (vop_t *)ufs_open },		/* open */
	{ &vop_close_desc, (vop_t *)lfs_close },	/* close */
	{ &vop_access_desc, (vop_t *)ufs_access },	/* access */
	{ &vop_getattr_desc, (vop_t *)lfs_getattr },	/* getattr */
	{ &vop_setattr_desc, (vop_t *)ufs_setattr },	/* setattr */
	{ &vop_read_desc, (vop_t *)lfs_read },		/* read */
	{ &vop_write_desc, (vop_t *)lfs_write },	/* write */
	{ &vop_ioctl_desc, (vop_t *)ufs_ioctl },	/* ioctl */
	{ &vop_select_desc, (vop_t *)ufs_select },	/* select */
	{ &vop_mmap_desc, (vop_t *)ufs_mmap },		/* mmap */
	{ &vop_fsync_desc, (vop_t *)lfs_fsync },	/* fsync */
	{ &vop_seek_desc, (vop_t *)ufs_seek },		/* seek */
	{ &vop_remove_desc, (vop_t *)ufs_remove },	/* remove */
	{ &vop_link_desc, (vop_t *)ufs_link },		/* link */
	{ &vop_rename_desc, (vop_t *)ufs_rename },	/* rename */
	{ &vop_mkdir_desc, (vop_t *)ufs_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, (vop_t *)ufs_rmdir },	/* rmdir */
	{ &vop_symlink_desc, (vop_t *)ufs_symlink },	/* symlink */
	{ &vop_readdir_desc, (vop_t *)ufs_readdir },	/* readdir */
	{ &vop_readlink_desc, (vop_t *)ufs_readlink },	/* readlink */
	{ &vop_abortop_desc, (vop_t *)ufs_abortop },	/* abortop */
	{ &vop_inactive_desc, (vop_t *)lfs_inactive },	/* inactive */
	{ &vop_reclaim_desc, (vop_t *)ufs_reclaim },	/* reclaim */
	{ &vop_lock_desc, (vop_t *)ufs_lock },		/* lock */
	{ &vop_unlock_desc, (vop_t *)ufs_unlock },	/* unlock */
	{ &vop_bmap_desc, (vop_t *)ufs_bmap },		/* bmap */
	{ &vop_strategy_desc, (vop_t *)ufs_strategy },	/* strategy */
	{ &vop_print_desc, (vop_t *)ufs_print },	/* print */
	{ &vop_islocked_desc, (vop_t *)ufs_islocked },	/* islocked */
	{ &vop_pathconf_desc, (vop_t *)ufs_pathconf },	/* pathconf */
	{ &vop_advlock_desc, (vop_t *)ufs_advlock },	/* advlock */
	{ &vop_blkatoff_desc, (vop_t *)lfs_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, (vop_t *)lfs_valloc },	/* valloc */
	{ &vop_vfree_desc, (vop_t *)lfs_vfree },	/* vfree */
	{ &vop_truncate_desc, (vop_t *)lfs_truncate },	/* truncate */
	{ &vop_update_desc, (vop_t *)lfs_update },	/* update */
	{ &vop_bwrite_desc, (vop_t *)lfs_bwrite },	/* bwrite */
	{ NULL, NULL }
};
static struct vnodeopv_desc lfs_vnodeop_opv_desc =
	{ &lfs_vnodeop_p, lfs_vnodeop_entries };

vop_t **lfs_specop_p;
static struct vnodeopv_entry_desc lfs_specop_entries[] = {
	{ &vop_default_desc, (vop_t *)vn_default_error },
	{ &vop_lookup_desc, (vop_t *)spec_lookup },	/* lookup */
	{ &vop_create_desc, (vop_t *)spec_create },	/* create */
	{ &vop_mknod_desc, (vop_t *)spec_mknod },	/* mknod */
	{ &vop_open_desc, (vop_t *)spec_open },		/* open */
	{ &vop_close_desc, (vop_t *)ufsspec_close },	/* close */
	{ &vop_access_desc, (vop_t *)ufs_access },	/* access */
	{ &vop_getattr_desc, (vop_t *)lfs_getattr },	/* getattr */
	{ &vop_setattr_desc, (vop_t *)ufs_setattr },	/* setattr */
	{ &vop_read_desc, (vop_t *)ufsspec_read },	/* read */
	{ &vop_write_desc, (vop_t *)ufsspec_write },	/* write */
	{ &vop_ioctl_desc, (vop_t *)spec_ioctl },	/* ioctl */
	{ &vop_select_desc, (vop_t *)spec_select },	/* select */
	{ &vop_mmap_desc, (vop_t *)spec_mmap },		/* mmap */
	{ &vop_fsync_desc, (vop_t *)spec_fsync },	/* fsync */
	{ &vop_seek_desc, (vop_t *)spec_seek },		/* seek */
	{ &vop_remove_desc, (vop_t *)spec_remove },	/* remove */
	{ &vop_link_desc, (vop_t *)spec_link },		/* link */
	{ &vop_rename_desc, (vop_t *)spec_rename },	/* rename */
	{ &vop_mkdir_desc, (vop_t *)spec_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, (vop_t *)spec_rmdir },	/* rmdir */
	{ &vop_symlink_desc, (vop_t *)spec_symlink },	/* symlink */
	{ &vop_readdir_desc, (vop_t *)spec_readdir },	/* readdir */
	{ &vop_readlink_desc, (vop_t *)spec_readlink },	/* readlink */
	{ &vop_abortop_desc, (vop_t *)spec_abortop },	/* abortop */
	{ &vop_inactive_desc, (vop_t *)lfs_inactive },	/* inactive */
	{ &vop_reclaim_desc, (vop_t *)ufs_reclaim },	/* reclaim */
	{ &vop_lock_desc, (vop_t *)ufs_lock },		/* lock */
	{ &vop_unlock_desc, (vop_t *)ufs_unlock },	/* unlock */
	{ &vop_bmap_desc, (vop_t *)spec_bmap },		/* bmap */
	{ &vop_strategy_desc, (vop_t *)spec_strategy },	/* strategy */
	{ &vop_print_desc, (vop_t *)ufs_print },	/* print */
	{ &vop_islocked_desc, (vop_t *)ufs_islocked },	/* islocked */
	{ &vop_pathconf_desc, (vop_t *)spec_pathconf },	/* pathconf */
	{ &vop_advlock_desc, (vop_t *)spec_advlock },	/* advlock */
	{ &vop_blkatoff_desc, (vop_t *)spec_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, (vop_t *)spec_valloc },	/* valloc */
	{ &vop_vfree_desc, (vop_t *)lfs_vfree },	/* vfree */
	{ &vop_truncate_desc, (vop_t *)spec_truncate },	/* truncate */
	{ &vop_update_desc, (vop_t *)lfs_update },	/* update */
	{ &vop_bwrite_desc, (vop_t *)lfs_bwrite },	/* bwrite */
	{ NULL, NULL }
};
static struct vnodeopv_desc lfs_specop_opv_desc =
	{ &lfs_specop_p, lfs_specop_entries };

vop_t **lfs_fifoop_p;
static struct vnodeopv_entry_desc lfs_fifoop_entries[] = {
	{ &vop_default_desc, (vop_t *)vn_default_error },
	{ &vop_lookup_desc, (vop_t *)fifo_lookup },	/* lookup */
	{ &vop_create_desc, (vop_t *)fifo_create },	/* create */
	{ &vop_mknod_desc, (vop_t *)fifo_mknod },	/* mknod */
	{ &vop_open_desc, (vop_t *)fifo_open },		/* open */
	{ &vop_close_desc, (vop_t *)ufsfifo_close },	/* close */
	{ &vop_access_desc, (vop_t *)ufs_access },	/* access */
	{ &vop_getattr_desc, (vop_t *)lfs_getattr },	/* getattr */
	{ &vop_setattr_desc, (vop_t *)ufs_setattr },	/* setattr */
	{ &vop_read_desc, (vop_t *)ufsfifo_read },	/* read */
	{ &vop_write_desc, (vop_t *)ufsfifo_write },	/* write */
	{ &vop_ioctl_desc, (vop_t *)fifo_ioctl },	/* ioctl */
	{ &vop_select_desc, (vop_t *)fifo_select },	/* select */
	{ &vop_mmap_desc, (vop_t *)fifo_mmap },		/* mmap */
	{ &vop_fsync_desc, (vop_t *)fifo_fsync },	/* fsync */
	{ &vop_seek_desc, (vop_t *)fifo_seek },		/* seek */
	{ &vop_remove_desc, (vop_t *)fifo_remove },	/* remove */
	{ &vop_link_desc, (vop_t *)fifo_link },		/* link */
	{ &vop_rename_desc, (vop_t *)fifo_rename },	/* rename */
	{ &vop_mkdir_desc, (vop_t *)fifo_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, (vop_t *)fifo_rmdir },	/* rmdir */
	{ &vop_symlink_desc, (vop_t *)fifo_symlink },	/* symlink */
	{ &vop_readdir_desc, (vop_t *)fifo_readdir },	/* readdir */
	{ &vop_readlink_desc, (vop_t *)fifo_readlink },	/* readlink */
	{ &vop_abortop_desc, (vop_t *)fifo_abortop },	/* abortop */
	{ &vop_inactive_desc, (vop_t *)lfs_inactive },	/* inactive */
	{ &vop_reclaim_desc, (vop_t *)ufs_reclaim },	/* reclaim */
	{ &vop_lock_desc, (vop_t *)ufs_lock },		/* lock */
	{ &vop_unlock_desc, (vop_t *)ufs_unlock },	/* unlock */
	{ &vop_bmap_desc, (vop_t *)fifo_bmap },		/* bmap */
	{ &vop_strategy_desc, (vop_t *)fifo_strategy },	/* strategy */
	{ &vop_print_desc, (vop_t *)ufs_print },	/* print */
	{ &vop_islocked_desc, (vop_t *)ufs_islocked },	/* islocked */
	{ &vop_pathconf_desc, (vop_t *)fifo_pathconf },	/* pathconf */
	{ &vop_advlock_desc, (vop_t *)fifo_advlock },	/* advlock */
	{ &vop_blkatoff_desc, (vop_t *)fifo_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, (vop_t *)fifo_valloc },	/* valloc */
	{ &vop_vfree_desc, (vop_t *)lfs_vfree },	/* vfree */
	{ &vop_truncate_desc, (vop_t *)fifo_truncate },	/* truncate */
	{ &vop_update_desc, (vop_t *)lfs_update },	/* update */
	{ &vop_bwrite_desc, (vop_t *)lfs_bwrite },	/* bwrite */
	{ NULL, NULL }
};
static struct vnodeopv_desc lfs_fifoop_opv_desc =
	{ &lfs_fifoop_p, lfs_fifoop_entries };

VNODEOP_SET(lfs_vnodeop_opv_desc);
VNODEOP_SET(lfs_specop_opv_desc);
VNODEOP_SET(lfs_fifoop_opv_desc);

#define	LFS_READWRITE
#include <ufs/ufs/ufs_readwrite.c>
#undef	LFS_READWRITE

/*
 * Synch an open file.
 */
/* ARGSUSED */
static int
lfs_fsync(ap)
	struct vop_fsync_args /* {
		struct vnode *a_vp;
		struct ucred *a_cred;
		int a_waitfor;
		struct proc *a_p;
	} */ *ap;
{
	struct timeval tv;
	int error;
	tv = time;

	error = (VOP_UPDATE(ap->a_vp, &tv, &tv,
	    ap->a_waitfor == MNT_WAIT ? LFS_SYNC : 0));
	if(ap->a_waitfor == MNT_WAIT && ap->a_vp->v_dirtyblkhd.lh_first != NULL)
	       panic("lfs_fsync: dirty bufs");
	return( error );
}

/*
 * These macros are used to bracket UFS directory ops, so that we can
 * identify all the pages touched during directory ops which need to
 * be ordered and flushed atomically, so that they may be recovered.
 */
#define	SET_DIROP(fs) {							\
	if ((fs)->lfs_writer)						\
		tsleep(&(fs)->lfs_dirops, PRIBIO + 1, "lfs_dirop", 0);	\
	++(fs)->lfs_dirops;						\
	(fs)->lfs_doifile = 1;						\
}

#define	SET_ENDOP(fs) {							\
	--(fs)->lfs_dirops;						\
	if (!(fs)->lfs_dirops)						\
		wakeup(&(fs)->lfs_writer);				\
}

#define	MARK_VNODE(dvp)	(dvp)->v_flag |= VDIROP


/* XXX hack to avoid calling ITIMES in getattr */
static int
lfs_getattr(ap)
	struct vop_getattr_args /* {
		struct vnode *a_vp;
		struct vattr *a_vap;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct inode *ip = VTOI(vp);
	register struct vattr *vap = ap->a_vap;
	/*
	 * Copy from inode table
	 */
	vap->va_fsid = ip->i_dev;
	vap->va_fileid = ip->i_number;
	vap->va_mode = ip->i_mode & ~IFMT;
	vap->va_nlink = ip->i_nlink;
	vap->va_uid = ip->i_uid;
	vap->va_gid = ip->i_gid;
	vap->va_rdev = (dev_t)ip->i_rdev;
	vap->va_size = ip->i_din.di_size;
	vap->va_atime = ip->i_atime;
	vap->va_mtime = ip->i_mtime;
	vap->va_ctime = ip->i_ctime;
	vap->va_flags = ip->i_flags;
	vap->va_gen = ip->i_gen;
	/* this doesn't belong here */
	if (vp->v_type == VBLK)
		vap->va_blocksize = BLKDEV_IOSIZE;
	else if (vp->v_type == VCHR)
		vap->va_blocksize = MAXBSIZE;
	else
		vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
	vap->va_bytes = dbtob(ip->i_blocks);
	vap->va_type = vp->v_type;
	vap->va_filerev = ip->i_modrev;
	return (0);
}
/*
 * Close called
 *
 * XXX -- we were using ufs_close, but since it updates the
 * times on the inode, we might need to bump the uinodes
 * count.
 */
/* ARGSUSED */
static int
lfs_close(ap)
	struct vop_close_args /* {
		struct vnode *a_vp;
		int  a_fflag;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct inode *ip = VTOI(vp);
	int mod;

	if (vp->v_usecount > 1 && !(ip->i_flag & IN_LOCKED)) {
		mod = ip->i_flag & IN_MODIFIED;
		ITIMES(ip, &time, &time);
		if (!mod && ip->i_flag & IN_MODIFIED)
			ip->i_lfs->lfs_uinodes++;
	}
	return (0);
}

/*
 * Stub inactive routine that avoids calling ufs_inactive in some cases.
 */

static int
lfs_inactive(ap)
	struct vop_inactive_args /* {
		struct vnode *a_vp;
	} */ *ap;
{

        if (ap->a_vp->v_flag & VNINACT) {
	  return(0);
        }
	return (ufs_inactive(ap));
}