297 lines
8.6 KiB
C
297 lines
8.6 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95
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* $FreeBSD$
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*/
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#include "opt_ufs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/kernel.h>
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#include <sys/stat.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/conf.h>
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#include <machine/limits.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <ufs/ufs/extattr.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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int ffs_fsync __P((struct vop_fsync_args *));
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static int ffs_getpages __P((struct vop_getpages_args *));
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static int ffs_read __P((struct vop_read_args *));
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static int ffs_write __P((struct vop_write_args *));
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/* Global vfs data structures for ufs. */
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vop_t **ffs_vnodeop_p;
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static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) ufs_vnoperate },
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{ &vop_fsync_desc, (vop_t *) ffs_fsync },
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{ &vop_getpages_desc, (vop_t *) ffs_getpages },
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{ &vop_read_desc, (vop_t *) ffs_read },
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{ &vop_reallocblks_desc, (vop_t *) ffs_reallocblks },
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{ &vop_write_desc, (vop_t *) ffs_write },
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#ifdef UFS_EXTATTR
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{ &vop_getextattr_desc, (vop_t *) ufs_vop_getextattr },
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{ &vop_setextattr_desc, (vop_t *) ufs_vop_setextattr },
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#endif
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{ NULL, NULL }
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};
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static struct vnodeopv_desc ffs_vnodeop_opv_desc =
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{ &ffs_vnodeop_p, ffs_vnodeop_entries };
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vop_t **ffs_specop_p;
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static struct vnodeopv_entry_desc ffs_specop_entries[] = {
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{ &vop_default_desc, (vop_t *) ufs_vnoperatespec },
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{ &vop_fsync_desc, (vop_t *) ffs_fsync },
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#ifdef UFS_EXTATTR
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{ &vop_getextattr_desc, (vop_t *) ufs_vop_getextattr },
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{ &vop_setextattr_desc, (vop_t *) ufs_vop_setextattr },
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#endif
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{ NULL, NULL }
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};
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static struct vnodeopv_desc ffs_specop_opv_desc =
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{ &ffs_specop_p, ffs_specop_entries };
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vop_t **ffs_fifoop_p;
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static struct vnodeopv_entry_desc ffs_fifoop_entries[] = {
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{ &vop_default_desc, (vop_t *) ufs_vnoperatefifo },
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#ifdef UFS_EXTATTR
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{ &vop_getextattr_desc, (vop_t *) ufs_vop_getextattr },
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{ &vop_setextattr_desc, (vop_t *) ufs_vop_setextattr },
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#endif
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{ &vop_fsync_desc, (vop_t *) ffs_fsync },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc ffs_fifoop_opv_desc =
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{ &ffs_fifoop_p, ffs_fifoop_entries };
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VNODEOP_SET(ffs_vnodeop_opv_desc);
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VNODEOP_SET(ffs_specop_opv_desc);
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VNODEOP_SET(ffs_fifoop_opv_desc);
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#include <ufs/ufs/ufs_readwrite.c>
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/*
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* Synch an open file.
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*/
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/* ARGSUSED */
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int
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ffs_fsync(ap)
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struct vop_fsync_args /* {
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struct vnode *a_vp;
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struct ucred *a_cred;
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int a_waitfor;
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struct proc *a_p;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct inode *ip = VTOI(vp);
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struct buf *bp;
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struct buf *nbp;
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int s, error, wait, passes, skipmeta;
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daddr_t lbn;
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/*
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* Snapshots have to be unlocked so they do not deadlock
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* checking whether they need to copy their written buffers.
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* We always hold a reference, so they cannot be removed
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* out from underneath us.
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*/
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if (ip->i_flags & SF_SNAPSHOT)
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VOP_UNLOCK(vp, 0, ap->a_p);
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wait = (ap->a_waitfor == MNT_WAIT);
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if (vn_isdisk(vp, NULL)) {
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lbn = INT_MAX;
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if (vp->v_rdev->si_mountpoint != NULL &&
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(vp->v_rdev->si_mountpoint->mnt_flag & MNT_SOFTDEP))
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softdep_fsync_mountdev(vp);
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} else {
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lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1));
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}
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/*
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* Flush all dirty buffers associated with a vnode.
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*/
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passes = NIADDR + 1;
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skipmeta = 0;
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if (wait)
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skipmeta = 1;
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s = splbio();
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loop:
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TAILQ_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs)
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bp->b_flags &= ~B_SCANNED;
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for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
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nbp = TAILQ_NEXT(bp, b_vnbufs);
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/*
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* Reasons to skip this buffer: it has already been considered
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* on this pass, this pass is the first time through on a
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* synchronous flush request and the buffer being considered
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* is metadata, the buffer has dependencies that will cause
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* it to be redirtied and it has not already been deferred,
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* or it is already being written.
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*/
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if ((bp->b_flags & B_SCANNED) != 0)
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continue;
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bp->b_flags |= B_SCANNED;
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if ((skipmeta == 1 && bp->b_lblkno < 0))
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continue;
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if (!wait && LIST_FIRST(&bp->b_dep) != NULL &&
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(bp->b_flags & B_DEFERRED) == 0 &&
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buf_countdeps(bp, 0)) {
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bp->b_flags |= B_DEFERRED;
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continue;
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}
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if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
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continue;
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if ((bp->b_flags & B_DELWRI) == 0)
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panic("ffs_fsync: not dirty");
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if (vp != bp->b_vp)
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panic("ffs_fsync: vp != vp->b_vp");
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/*
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* If this is a synchronous flush request, or it is not a
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* file or device, start the write on this buffer immediatly.
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*/
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if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) {
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/*
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* On our final pass through, do all I/O synchronously
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* so that we can find out if our flush is failing
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* because of write errors.
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*/
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if (passes > 0 || !wait) {
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if ((bp->b_flags & B_CLUSTEROK) && !wait) {
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BUF_UNLOCK(bp);
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(void) vfs_bio_awrite(bp);
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} else {
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bremfree(bp);
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splx(s);
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(void) bawrite(bp);
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s = splbio();
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}
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} else {
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bremfree(bp);
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splx(s);
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if ((error = bwrite(bp)) != 0)
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return (error);
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s = splbio();
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}
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} else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) {
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/*
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* If the buffer is for data that has been truncated
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* off the file, then throw it away.
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*/
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bremfree(bp);
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bp->b_flags |= B_INVAL | B_NOCACHE;
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splx(s);
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brelse(bp);
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s = splbio();
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} else {
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BUF_UNLOCK(bp);
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vfs_bio_awrite(bp);
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}
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/*
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* Since we may have slept during the I/O, we need
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* to start from a known point.
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*/
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nbp = TAILQ_FIRST(&vp->v_dirtyblkhd);
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}
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/*
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* If we were asked to do this synchronously, then go back for
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* another pass, this time doing the metadata.
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*/
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if (skipmeta) {
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skipmeta = 0;
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goto loop;
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}
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if (wait) {
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while (vp->v_numoutput) {
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vp->v_flag |= VBWAIT;
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(void) tsleep((caddr_t)&vp->v_numoutput,
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PRIBIO + 4, "ffsfsn", 0);
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}
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/*
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* Ensure that any filesystem metatdata associated
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* with the vnode has been written.
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*/
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splx(s);
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if ((error = softdep_sync_metadata(ap)) != 0)
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return (error);
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s = splbio();
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if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
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/*
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* Block devices associated with filesystems may
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* have new I/O requests posted for them even if
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* the vnode is locked, so no amount of trying will
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* get them clean. Thus we give block devices a
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* good effort, then just give up. For all other file
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* types, go around and try again until it is clean.
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*/
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if (passes > 0) {
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passes -= 1;
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goto loop;
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}
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#ifdef DIAGNOSTIC
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if (!vn_isdisk(vp, NULL))
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vprint("ffs_fsync: dirty", vp);
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#endif
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}
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}
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splx(s);
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error = UFS_UPDATE(vp, wait);
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if (ip->i_flags & SF_SNAPSHOT)
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_p);
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return (error);
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}
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