- Fix for possible unset uid/gid in toproto - Fix for default mtree style - Update libelf - Importing libexecinfo - Resynchronize GCC, mpc, gmp, mpfr - build.sh: Replace params with show-params. This has been done as the make target has been renamed in the same way, while a new target named params has been added. This new target generates a file containing all the parameters, instead of printing it on the console. - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org) get getservbyport() out of the inner loop Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2325 lines
62 KiB
C
2325 lines
62 KiB
C
/* $NetBSD: ffs_snapshot.c,v 1.131 2013/10/19 19:28:13 martin Exp $ */
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/*
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* Copyright 2000 Marshall Kirk McKusick. All Rights Reserved.
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*
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* Further information about snapshots can be obtained from:
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*
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* Marshall Kirk McKusick http://www.mckusick.com/softdep/
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* 1614 Oxford Street mckusick@mckusick.com
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* Berkeley, CA 94709-1608 +1-510-843-9542
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* USA
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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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*
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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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*
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* THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR
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* 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_snapshot.c 8.11 (McKusick) 7/23/00
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*
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* from FreeBSD: ffs_snapshot.c,v 1.79 2004/02/13 02:02:06 kuriyama Exp
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ffs_snapshot.c,v 1.131 2013/10/19 19:28:13 martin Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_ffs.h"
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#include "opt_quota.h"
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#endif
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/namei.h>
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#include <sys/sched.h>
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#include <sys/stat.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <sys/vnode.h>
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#include <sys/kauth.h>
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#include <sys/fstrans.h>
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#include <sys/wapbl.h>
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#include <miscfs/specfs/specdev.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ufs/ufs_bswap.h>
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#include <ufs/ufs/ufs_wapbl.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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#include <uvm/uvm.h>
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struct snap_info {
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kmutex_t si_lock; /* Lock this snapinfo */
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kmutex_t si_snaplock; /* Snapshot vnode common lock */
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lwp_t *si_owner; /* Sanplock owner */
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TAILQ_HEAD(inodelst, inode) si_snapshots; /* List of active snapshots */
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daddr_t *si_snapblklist; /* Snapshot block hints list */
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uint32_t si_gen; /* Incremented on change */
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};
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#if !defined(FFS_NO_SNAPSHOT)
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typedef int (*acctfunc_t)
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(struct vnode *, void *, int, int, struct fs *, daddr_t, int);
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static int snapshot_setup(struct mount *, struct vnode *);
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static int snapshot_copyfs(struct mount *, struct vnode *, void **);
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static int snapshot_expunge(struct mount *, struct vnode *,
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struct fs *, daddr_t *, daddr_t **);
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static int snapshot_expunge_snap(struct mount *, struct vnode *,
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struct fs *, daddr_t);
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static int snapshot_writefs(struct mount *, struct vnode *, void *);
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static int cgaccount(struct vnode *, int, int *);
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static int cgaccount1(int, struct vnode *, void *, int);
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static int expunge(struct vnode *, struct inode *, struct fs *,
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acctfunc_t, int);
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static int indiracct(struct vnode *, struct vnode *, int, daddr_t,
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daddr_t, daddr_t, daddr_t, daddr_t, struct fs *, acctfunc_t, int);
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static int fullacct(struct vnode *, void *, int, int, struct fs *,
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daddr_t, int);
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static int snapacct(struct vnode *, void *, int, int, struct fs *,
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daddr_t, int);
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static int mapacct(struct vnode *, void *, int, int, struct fs *,
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daddr_t, int);
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#endif /* !defined(FFS_NO_SNAPSHOT) */
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static int ffs_copyonwrite(void *, struct buf *, bool);
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static int snapblkaddr(struct vnode *, daddr_t, daddr_t *);
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static int rwfsblk(struct vnode *, int, void *, daddr_t);
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static int syncsnap(struct vnode *);
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static int wrsnapblk(struct vnode *, void *, daddr_t);
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#if !defined(FFS_NO_SNAPSHOT)
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static int blocks_in_journal(struct fs *);
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#endif
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static inline bool is_active_snapshot(struct snap_info *, struct inode *);
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static inline daddr_t db_get(struct inode *, int);
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static inline void db_assign(struct inode *, int, daddr_t);
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static inline daddr_t ib_get(struct inode *, int);
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static inline daddr_t idb_get(struct inode *, void *, int);
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static inline void idb_assign(struct inode *, void *, int, daddr_t);
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#ifdef DEBUG
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static int snapdebug = 0;
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#endif
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int
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ffs_snapshot_init(struct ufsmount *ump)
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{
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struct snap_info *si;
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si = ump->um_snapinfo = kmem_alloc(sizeof(*si), KM_SLEEP);
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if (si == NULL)
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return ENOMEM;
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TAILQ_INIT(&si->si_snapshots);
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mutex_init(&si->si_lock, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&si->si_snaplock, MUTEX_DEFAULT, IPL_NONE);
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si->si_owner = NULL;
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si->si_gen = 0;
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si->si_snapblklist = NULL;
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return 0;
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}
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void
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ffs_snapshot_fini(struct ufsmount *ump)
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{
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struct snap_info *si;
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si = ump->um_snapinfo;
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ump->um_snapinfo = NULL;
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KASSERT(TAILQ_EMPTY(&si->si_snapshots));
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mutex_destroy(&si->si_lock);
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mutex_destroy(&si->si_snaplock);
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KASSERT(si->si_snapblklist == NULL);
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kmem_free(si, sizeof(*si));
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}
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/*
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* Create a snapshot file and initialize it for the filesystem.
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* Vnode is locked on entry and return.
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*/
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int
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ffs_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ctime)
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{
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#if defined(FFS_NO_SNAPSHOT)
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return EOPNOTSUPP;
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}
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#else /* defined(FFS_NO_SNAPSHOT) */
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bool suspended = false;
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int error, redo = 0, snaploc;
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void *sbbuf = NULL;
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daddr_t *snaplist = NULL, snaplistsize = 0;
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struct buf *bp, *nbp;
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struct fs *copy_fs = NULL;
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struct fs *fs = VFSTOUFS(mp)->um_fs;
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struct inode *ip = VTOI(vp);
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struct lwp *l = curlwp;
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struct snap_info *si = VFSTOUFS(mp)->um_snapinfo;
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struct timespec ts;
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struct timeval starttime;
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#ifdef DEBUG
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struct timeval endtime;
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#endif
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struct vnode *devvp = ip->i_devvp;
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/*
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* If the vnode already is a snapshot, return.
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*/
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if ((VTOI(vp)->i_flags & SF_SNAPSHOT)) {
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if ((VTOI(vp)->i_flags & SF_SNAPINVAL))
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return EINVAL;
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if (ctime) {
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ctime->tv_sec = DIP(VTOI(vp), mtime);
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ctime->tv_nsec = DIP(VTOI(vp), mtimensec);
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}
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return 0;
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}
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/*
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* Check for free snapshot slot in the superblock.
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*/
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for (snaploc = 0; snaploc < FSMAXSNAP; snaploc++)
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if (fs->fs_snapinum[snaploc] == 0)
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break;
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if (snaploc == FSMAXSNAP)
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return (ENOSPC);
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/*
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* Prepare the vnode to become a snapshot.
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*/
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error = snapshot_setup(mp, vp);
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if (error)
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goto out;
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/*
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* Copy all the cylinder group maps. Although the
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* filesystem is still active, we hope that only a few
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* cylinder groups will change between now and when we
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* suspend operations. Thus, we will be able to quickly
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* touch up the few cylinder groups that changed during
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* the suspension period.
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*/
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error = cgaccount(vp, 1, NULL);
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if (error)
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goto out;
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/*
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* snapshot is now valid
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*/
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ip->i_flags &= ~SF_SNAPINVAL;
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DIP_ASSIGN(ip, flags, ip->i_flags);
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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/*
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* Ensure that the snapshot is completely on disk.
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* Since we have marked it as a snapshot it is safe to
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* unlock it as no process will be allowed to write to it.
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*/
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error = VOP_FSYNC(vp, l->l_cred, FSYNC_WAIT, 0, 0);
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if (error)
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goto out;
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VOP_UNLOCK(vp);
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/*
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* All allocations are done, so we can now suspend the filesystem.
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*/
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error = vfs_suspend(vp->v_mount, 0);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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if (error)
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goto out;
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suspended = true;
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getmicrotime(&starttime);
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/*
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* First, copy all the cylinder group maps that have changed.
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*/
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error = cgaccount(vp, 2, &redo);
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if (error)
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goto out;
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/*
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* Create a copy of the superblock and its summary information.
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*/
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error = snapshot_copyfs(mp, vp, &sbbuf);
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copy_fs = (struct fs *)((char *)sbbuf + ffs_blkoff(fs, fs->fs_sblockloc));
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if (error)
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goto out;
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/*
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* Expunge unlinked files from our view.
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*/
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error = snapshot_expunge(mp, vp, copy_fs, &snaplistsize, &snaplist);
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if (error)
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goto out;
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/*
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* Record snapshot inode. Since this is the newest snapshot,
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* it must be placed at the end of the list.
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*/
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if (ip->i_nlink > 0)
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fs->fs_snapinum[snaploc] = ip->i_number;
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mutex_enter(&si->si_lock);
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if (is_active_snapshot(si, ip))
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panic("ffs_snapshot: %"PRIu64" already on list", ip->i_number);
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TAILQ_INSERT_TAIL(&si->si_snapshots, ip, i_nextsnap);
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if (TAILQ_FIRST(&si->si_snapshots) == ip) {
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/*
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* If this is the first snapshot on this filesystem, put the
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* preliminary list in place and establish the cow handler.
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*/
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si->si_snapblklist = snaplist;
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fscow_establish(mp, ffs_copyonwrite, devvp);
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}
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si->si_gen++;
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mutex_exit(&si->si_lock);
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vp->v_vflag |= VV_SYSTEM;
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/*
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* Set the mtime to the time the snapshot has been taken.
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*/
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TIMEVAL_TO_TIMESPEC(&starttime, &ts);
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if (ctime)
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*ctime = ts;
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DIP_ASSIGN(ip, mtime, ts.tv_sec);
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DIP_ASSIGN(ip, mtimensec, ts.tv_nsec);
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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/*
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* Copy allocation information from all snapshots and then
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* expunge them from our view.
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*/
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error = snapshot_expunge_snap(mp, vp, copy_fs, snaplistsize);
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if (error)
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goto out;
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/*
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* Write the superblock and its summary information to the snapshot.
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*/
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error = snapshot_writefs(mp, vp, sbbuf);
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if (error)
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goto out;
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/*
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* We're nearly done, ensure that the snapshot is completely on disk.
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*/
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error = VOP_FSYNC(vp, l->l_cred, FSYNC_WAIT, 0, 0);
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if (error)
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goto out;
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/*
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* Invalidate and free all pages on the snapshot vnode.
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* We will read and write through the buffercache.
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*/
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mutex_enter(vp->v_interlock);
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error = VOP_PUTPAGES(vp, 0, 0,
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PGO_ALLPAGES | PGO_CLEANIT | PGO_SYNCIO | PGO_FREE);
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if (error)
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goto out;
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/*
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* Invalidate short ( < fs_bsize ) buffers. We will always read
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* full size buffers later.
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*/
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mutex_enter(&bufcache_lock);
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KASSERT(LIST_FIRST(&vp->v_dirtyblkhd) == NULL);
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for (bp = LIST_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) {
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nbp = LIST_NEXT(bp, b_vnbufs);
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if (bp->b_bcount == fs->fs_bsize)
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continue;
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error = bbusy(bp, false, 0, NULL);
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if (error != 0) {
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if (error == EPASSTHROUGH) {
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nbp = LIST_FIRST(&vp->v_cleanblkhd);
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continue;
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}
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break;
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}
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brelsel(bp, BC_INVAL | BC_VFLUSH);
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}
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mutex_exit(&bufcache_lock);
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out:
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if (sbbuf != NULL) {
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free(copy_fs->fs_csp, M_UFSMNT);
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free(sbbuf, M_UFSMNT);
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}
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if (fs->fs_active != NULL) {
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free(fs->fs_active, M_DEVBUF);
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fs->fs_active = NULL;
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}
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mutex_enter(&si->si_lock);
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if (snaplist != NULL) {
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if (si->si_snapblklist == snaplist)
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si->si_snapblklist = NULL;
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free(snaplist, M_UFSMNT);
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}
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if (error) {
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fs->fs_snapinum[snaploc] = 0;
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} else {
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/*
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* As this is the newest list, it is the most inclusive, so
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* should replace the previous list.
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*/
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si->si_snapblklist = ip->i_snapblklist;
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}
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si->si_gen++;
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mutex_exit(&si->si_lock);
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|
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if (suspended) {
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VOP_UNLOCK(vp);
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vfs_resume(vp->v_mount);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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#ifdef DEBUG
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getmicrotime(&endtime);
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timersub(&endtime, &starttime, &endtime);
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printf("%s: suspended %lld.%03d sec, redo %d of %d\n",
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mp->mnt_stat.f_mntonname, (long long)endtime.tv_sec,
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endtime.tv_usec / 1000, redo, fs->fs_ncg);
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#endif
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}
|
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if (error) {
|
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if (!UFS_WAPBL_BEGIN(mp)) {
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(void) ffs_truncate(vp, (off_t)0, 0, NOCRED);
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UFS_WAPBL_END(mp);
|
|
}
|
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} else if (ip->i_nlink > 0)
|
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vref(vp);
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return (error);
|
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}
|
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|
|
/*
|
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* Prepare vnode to become a snapshot.
|
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*/
|
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static int
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snapshot_setup(struct mount *mp, struct vnode *vp)
|
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{
|
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int error, n, len, loc, cg;
|
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daddr_t blkno, numblks;
|
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struct buf *ibp, *nbp;
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struct fs *fs = VFSTOUFS(mp)->um_fs;
|
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struct lwp *l = curlwp;
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const int wbreak = blocks_in_journal(fs)/8;
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struct inode *ip = VTOI(vp);
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|
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/*
|
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* Check mount, exclusive reference and owner.
|
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*/
|
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if (vp->v_mount != mp)
|
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return EXDEV;
|
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if (vp->v_usecount != 1 || vp->v_writecount != 0)
|
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return EBUSY;
|
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error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_SNAPSHOT,
|
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0, mp, vp, NULL);
|
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if (error)
|
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return EACCES;
|
|
|
|
if (vp->v_size != 0) {
|
|
error = ffs_truncate(vp, 0, 0, NOCRED);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/* Change inode to snapshot type file. */
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
#if defined(QUOTA) || defined(QUOTA2)
|
|
/* shapshot inodes are not accounted in quotas */
|
|
chkiq(ip, -1, l->l_cred, 0);
|
|
#endif
|
|
ip->i_flags |= (SF_SNAPSHOT | SF_SNAPINVAL);
|
|
DIP_ASSIGN(ip, flags, ip->i_flags);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
ffs_update(vp, NULL, NULL, UPDATE_WAIT);
|
|
UFS_WAPBL_END(mp);
|
|
|
|
KASSERT(ip->i_flags & SF_SNAPSHOT);
|
|
/*
|
|
* Write an empty list of preallocated blocks to the end of
|
|
* the snapshot to set size to at least that of the filesystem.
|
|
*/
|
|
numblks = howmany(fs->fs_size, fs->fs_frag);
|
|
blkno = 1;
|
|
blkno = ufs_rw64(blkno, UFS_FSNEEDSWAP(fs));
|
|
error = vn_rdwr(UIO_WRITE, vp,
|
|
(void *)&blkno, sizeof(blkno), ffs_lblktosize(fs, (off_t)numblks),
|
|
UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, l->l_cred, NULL, NULL);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Preallocate critical data structures so that we can copy
|
|
* them in without further allocation after we suspend all
|
|
* operations on the filesystem. We would like to just release
|
|
* the allocated buffers without writing them since they will
|
|
* be filled in below once we are ready to go, but this upsets
|
|
* the soft update code, so we go ahead and write the new buffers.
|
|
*
|
|
* Allocate all indirect blocks and mark all of them as not
|
|
* needing to be copied.
|
|
*/
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
for (blkno = UFS_NDADDR, n = 0; blkno < numblks; blkno += FFS_NINDIR(fs)) {
|
|
error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)blkno),
|
|
fs->fs_bsize, l->l_cred, B_METAONLY, &ibp);
|
|
if (error)
|
|
goto out;
|
|
brelse(ibp, 0);
|
|
if (wbreak > 0 && (++n % wbreak) == 0) {
|
|
UFS_WAPBL_END(mp);
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
/*
|
|
* Allocate copies for the superblock and its summary information.
|
|
*/
|
|
error = ffs_balloc(vp, fs->fs_sblockloc, fs->fs_sbsize, l->l_cred,
|
|
0, &nbp);
|
|
if (error)
|
|
goto out;
|
|
bawrite(nbp);
|
|
blkno = ffs_fragstoblks(fs, fs->fs_csaddr);
|
|
len = howmany(fs->fs_cssize, fs->fs_bsize);
|
|
for (loc = 0; loc < len; loc++) {
|
|
error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)(blkno + loc)),
|
|
fs->fs_bsize, l->l_cred, 0, &nbp);
|
|
if (error)
|
|
goto out;
|
|
bawrite(nbp);
|
|
if (wbreak > 0 && (++n % wbreak) == 0) {
|
|
UFS_WAPBL_END(mp);
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
/*
|
|
* Allocate all cylinder group blocks.
|
|
*/
|
|
for (cg = 0; cg < fs->fs_ncg; cg++) {
|
|
error = ffs_balloc(vp, ffs_lfragtosize(fs, cgtod(fs, cg)),
|
|
fs->fs_bsize, l->l_cred, 0, &nbp);
|
|
if (error)
|
|
goto out;
|
|
bawrite(nbp);
|
|
if (wbreak > 0 && (++n % wbreak) == 0) {
|
|
UFS_WAPBL_END(mp);
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
|
|
out:
|
|
UFS_WAPBL_END(mp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Create a copy of the superblock and its summary information.
|
|
* It is up to the caller to free copyfs and copy_fs->fs_csp.
|
|
*/
|
|
static int
|
|
snapshot_copyfs(struct mount *mp, struct vnode *vp, void **sbbuf)
|
|
{
|
|
int error, i, len, loc, size;
|
|
void *space;
|
|
int32_t *lp;
|
|
struct buf *bp;
|
|
struct fs *copyfs, *fs = VFSTOUFS(mp)->um_fs;
|
|
struct lwp *l = curlwp;
|
|
struct vnode *devvp = VTOI(vp)->i_devvp;
|
|
|
|
/*
|
|
* Grab a copy of the superblock and its summary information.
|
|
* We delay writing it until the suspension is released below.
|
|
*/
|
|
*sbbuf = malloc(fs->fs_bsize, M_UFSMNT, M_WAITOK);
|
|
loc = ffs_blkoff(fs, fs->fs_sblockloc);
|
|
if (loc > 0)
|
|
memset(*sbbuf, 0, loc);
|
|
copyfs = (struct fs *)((char *)(*sbbuf) + loc);
|
|
memcpy(copyfs, fs, fs->fs_sbsize);
|
|
size = fs->fs_bsize < SBLOCKSIZE ? fs->fs_bsize : SBLOCKSIZE;
|
|
if (fs->fs_sbsize < size)
|
|
memset((char *)(*sbbuf) + loc + fs->fs_sbsize, 0,
|
|
size - fs->fs_sbsize);
|
|
size = ffs_blkroundup(fs, fs->fs_cssize);
|
|
if (fs->fs_contigsumsize > 0)
|
|
size += fs->fs_ncg * sizeof(int32_t);
|
|
space = malloc(size, M_UFSMNT, M_WAITOK);
|
|
copyfs->fs_csp = space;
|
|
memcpy(copyfs->fs_csp, fs->fs_csp, fs->fs_cssize);
|
|
space = (char *)space + fs->fs_cssize;
|
|
loc = howmany(fs->fs_cssize, fs->fs_fsize);
|
|
i = fs->fs_frag - loc % fs->fs_frag;
|
|
len = (i == fs->fs_frag) ? 0 : i * fs->fs_fsize;
|
|
if (len > 0) {
|
|
if ((error = bread(devvp, FFS_FSBTODB(fs, fs->fs_csaddr + loc),
|
|
len, l->l_cred, 0, &bp)) != 0) {
|
|
free(copyfs->fs_csp, M_UFSMNT);
|
|
free(*sbbuf, M_UFSMNT);
|
|
*sbbuf = NULL;
|
|
return error;
|
|
}
|
|
memcpy(space, bp->b_data, (u_int)len);
|
|
space = (char *)space + len;
|
|
brelse(bp, BC_INVAL | BC_NOCACHE);
|
|
}
|
|
if (fs->fs_contigsumsize > 0) {
|
|
copyfs->fs_maxcluster = lp = space;
|
|
for (i = 0; i < fs->fs_ncg; i++)
|
|
*lp++ = fs->fs_contigsumsize;
|
|
}
|
|
if (mp->mnt_wapbl)
|
|
copyfs->fs_flags &= ~FS_DOWAPBL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We must check for active files that have been unlinked (e.g., with a zero
|
|
* link count). We have to expunge all trace of these files from the snapshot
|
|
* so that they are not reclaimed prematurely by fsck or unnecessarily dumped.
|
|
* Note that we skip unlinked snapshot files as they will be handled separately.
|
|
* Calculate the snapshot list size and create a preliminary list.
|
|
*/
|
|
static int
|
|
snapshot_expunge(struct mount *mp, struct vnode *vp, struct fs *copy_fs,
|
|
daddr_t *snaplistsize, daddr_t **snaplist)
|
|
{
|
|
int cg, error = 0, len, loc;
|
|
daddr_t blkno, *blkp;
|
|
struct fs *fs = VFSTOUFS(mp)->um_fs;
|
|
struct inode *xp;
|
|
struct lwp *l = curlwp;
|
|
struct vattr vat;
|
|
struct vnode *logvp = NULL, *mvp = NULL, *xvp;
|
|
|
|
*snaplist = NULL;
|
|
/*
|
|
* Get the log inode if any.
|
|
*/
|
|
if ((fs->fs_flags & FS_DOWAPBL) &&
|
|
fs->fs_journal_location == UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM) {
|
|
error = VFS_VGET(mp,
|
|
fs->fs_journallocs[UFS_WAPBL_INFS_INO], &logvp);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
/*
|
|
* Allocate a marker vnode.
|
|
*/
|
|
mvp = vnalloc(mp);
|
|
/*
|
|
* We also calculate the needed size for the snapshot list.
|
|
*/
|
|
*snaplistsize = fs->fs_ncg + howmany(fs->fs_cssize, fs->fs_bsize) +
|
|
FSMAXSNAP + 1 /* superblock */ + 1 /* last block */ + 1 /* size */;
|
|
mutex_enter(&mntvnode_lock);
|
|
/*
|
|
* NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
|
|
* and vclean() can be called indirectly
|
|
*/
|
|
for (xvp = TAILQ_FIRST(&mp->mnt_vnodelist); xvp; xvp = vunmark(mvp)) {
|
|
vmark(mvp, xvp);
|
|
/*
|
|
* Make sure this vnode wasn't reclaimed in getnewvnode().
|
|
* Start over if it has (it won't be on the list anymore).
|
|
*/
|
|
if (xvp->v_mount != mp || vismarker(xvp))
|
|
continue;
|
|
mutex_enter(xvp->v_interlock);
|
|
if ((xvp->v_iflag & VI_XLOCK) ||
|
|
xvp->v_usecount == 0 || xvp->v_type == VNON ||
|
|
VTOI(xvp) == NULL ||
|
|
(VTOI(xvp)->i_flags & SF_SNAPSHOT)) {
|
|
mutex_exit(xvp->v_interlock);
|
|
continue;
|
|
}
|
|
mutex_exit(&mntvnode_lock);
|
|
/*
|
|
* XXXAD should increase vnode ref count to prevent it
|
|
* disappearing or being recycled.
|
|
*/
|
|
mutex_exit(xvp->v_interlock);
|
|
#ifdef DEBUG
|
|
if (snapdebug)
|
|
vprint("ffs_snapshot: busy vnode", xvp);
|
|
#endif
|
|
xp = VTOI(xvp);
|
|
if (xvp != logvp) {
|
|
if (VOP_GETATTR(xvp, &vat, l->l_cred) == 0 &&
|
|
vat.va_nlink > 0) {
|
|
mutex_enter(&mntvnode_lock);
|
|
continue;
|
|
}
|
|
if (ffs_checkfreefile(copy_fs, vp, xp->i_number)) {
|
|
mutex_enter(&mntvnode_lock);
|
|
continue;
|
|
}
|
|
}
|
|
/*
|
|
* If there is a fragment, clear it here.
|
|
*/
|
|
blkno = 0;
|
|
loc = howmany(xp->i_size, fs->fs_bsize) - 1;
|
|
if (loc < UFS_NDADDR) {
|
|
len = ffs_fragroundup(fs, ffs_blkoff(fs, xp->i_size));
|
|
if (len > 0 && len < fs->fs_bsize) {
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error) {
|
|
(void)vunmark(mvp);
|
|
goto out;
|
|
}
|
|
ffs_blkfree_snap(copy_fs, vp, db_get(xp, loc),
|
|
len, xp->i_number);
|
|
blkno = db_get(xp, loc);
|
|
db_assign(xp, loc, 0);
|
|
UFS_WAPBL_END(mp);
|
|
}
|
|
}
|
|
*snaplistsize += 1;
|
|
error = expunge(vp, xp, copy_fs, fullacct, BLK_NOCOPY);
|
|
if (blkno)
|
|
db_assign(xp, loc, blkno);
|
|
if (!error) {
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (!error) {
|
|
error = ffs_freefile_snap(copy_fs, vp,
|
|
xp->i_number, xp->i_mode);
|
|
UFS_WAPBL_END(mp);
|
|
}
|
|
}
|
|
if (error) {
|
|
(void)vunmark(mvp);
|
|
goto out;
|
|
}
|
|
mutex_enter(&mntvnode_lock);
|
|
}
|
|
mutex_exit(&mntvnode_lock);
|
|
/*
|
|
* Create a preliminary list of preallocated snapshot blocks.
|
|
*/
|
|
*snaplist = malloc(*snaplistsize * sizeof(daddr_t), M_UFSMNT, M_WAITOK);
|
|
blkp = &(*snaplist)[1];
|
|
*blkp++ = ffs_lblkno(fs, fs->fs_sblockloc);
|
|
blkno = ffs_fragstoblks(fs, fs->fs_csaddr);
|
|
for (cg = 0; cg < fs->fs_ncg; cg++) {
|
|
if (ffs_fragstoblks(fs, cgtod(fs, cg)) > blkno)
|
|
break;
|
|
*blkp++ = ffs_fragstoblks(fs, cgtod(fs, cg));
|
|
}
|
|
len = howmany(fs->fs_cssize, fs->fs_bsize);
|
|
for (loc = 0; loc < len; loc++)
|
|
*blkp++ = blkno + loc;
|
|
for (; cg < fs->fs_ncg; cg++)
|
|
*blkp++ = ffs_fragstoblks(fs, cgtod(fs, cg));
|
|
(*snaplist)[0] = blkp - &(*snaplist)[0];
|
|
|
|
out:
|
|
if (mvp != NULL)
|
|
vnfree(mvp);
|
|
if (logvp != NULL)
|
|
vput(logvp);
|
|
if (error && *snaplist != NULL) {
|
|
free(*snaplist, M_UFSMNT);
|
|
*snaplist = NULL;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Copy allocation information from all the snapshots in this snapshot and
|
|
* then expunge them from its view. Also, collect the list of allocated
|
|
* blocks in i_snapblklist.
|
|
*/
|
|
static int
|
|
snapshot_expunge_snap(struct mount *mp, struct vnode *vp,
|
|
struct fs *copy_fs, daddr_t snaplistsize)
|
|
{
|
|
int error = 0, i;
|
|
daddr_t numblks, *snaplist = NULL;
|
|
struct fs *fs = VFSTOUFS(mp)->um_fs;
|
|
struct inode *ip = VTOI(vp), *xp;
|
|
struct lwp *l = curlwp;
|
|
struct snap_info *si = VFSTOUFS(mp)->um_snapinfo;
|
|
|
|
TAILQ_FOREACH(xp, &si->si_snapshots, i_nextsnap) {
|
|
if (xp != ip) {
|
|
error = expunge(vp, xp, fs, snapacct, BLK_SNAP);
|
|
if (error)
|
|
break;
|
|
}
|
|
if (xp->i_nlink != 0)
|
|
continue;
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
break;
|
|
error = ffs_freefile_snap(copy_fs, vp, xp->i_number, xp->i_mode);
|
|
UFS_WAPBL_END(mp);
|
|
if (error)
|
|
break;
|
|
}
|
|
if (error)
|
|
goto out;
|
|
/*
|
|
* Allocate space for the full list of preallocated snapshot blocks.
|
|
*/
|
|
snaplist = malloc(snaplistsize * sizeof(daddr_t), M_UFSMNT, M_WAITOK);
|
|
ip->i_snapblklist = &snaplist[1];
|
|
/*
|
|
* Expunge the blocks used by the snapshots from the set of
|
|
* blocks marked as used in the snapshot bitmaps. Also, collect
|
|
* the list of allocated blocks in i_snapblklist.
|
|
*/
|
|
error = expunge(vp, ip, copy_fs, mapacct, BLK_SNAP);
|
|
if (error)
|
|
goto out;
|
|
if (snaplistsize < ip->i_snapblklist - snaplist)
|
|
panic("ffs_snapshot: list too small");
|
|
snaplistsize = ip->i_snapblklist - snaplist;
|
|
snaplist[0] = snaplistsize;
|
|
ip->i_snapblklist = &snaplist[0];
|
|
/*
|
|
* Write out the list of allocated blocks to the end of the snapshot.
|
|
*/
|
|
numblks = howmany(fs->fs_size, fs->fs_frag);
|
|
for (i = 0; i < snaplistsize; i++)
|
|
snaplist[i] = ufs_rw64(snaplist[i], UFS_FSNEEDSWAP(fs));
|
|
error = vn_rdwr(UIO_WRITE, vp, (void *)snaplist,
|
|
snaplistsize * sizeof(daddr_t), ffs_lblktosize(fs, (off_t)numblks),
|
|
UIO_SYSSPACE, IO_NODELOCKED | IO_UNIT, l->l_cred, NULL, NULL);
|
|
for (i = 0; i < snaplistsize; i++)
|
|
snaplist[i] = ufs_rw64(snaplist[i], UFS_FSNEEDSWAP(fs));
|
|
out:
|
|
if (error && snaplist != NULL) {
|
|
free(snaplist, M_UFSMNT);
|
|
ip->i_snapblklist = NULL;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Write the superblock and its summary information to the snapshot.
|
|
* Make sure, the first UFS_NDADDR blocks get copied to the snapshot.
|
|
*/
|
|
static int
|
|
snapshot_writefs(struct mount *mp, struct vnode *vp, void *sbbuf)
|
|
{
|
|
int error, len, loc;
|
|
void *space;
|
|
daddr_t blkno;
|
|
struct buf *bp;
|
|
struct fs *copyfs, *fs = VFSTOUFS(mp)->um_fs;
|
|
struct inode *ip = VTOI(vp);
|
|
struct lwp *l = curlwp;
|
|
|
|
copyfs = (struct fs *)((char *)sbbuf + ffs_blkoff(fs, fs->fs_sblockloc));
|
|
|
|
/*
|
|
* Write the superblock and its summary information
|
|
* to the snapshot.
|
|
*/
|
|
blkno = ffs_fragstoblks(fs, fs->fs_csaddr);
|
|
len = howmany(fs->fs_cssize, fs->fs_bsize);
|
|
space = copyfs->fs_csp;
|
|
#ifdef FFS_EI
|
|
if (UFS_FSNEEDSWAP(fs)) {
|
|
ffs_sb_swap(copyfs, copyfs);
|
|
ffs_csum_swap(space, space, fs->fs_cssize);
|
|
}
|
|
#endif
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
for (loc = 0; loc < len; loc++) {
|
|
error = bread(vp, blkno + loc, fs->fs_bsize, l->l_cred,
|
|
B_MODIFY, &bp);
|
|
if (error) {
|
|
break;
|
|
}
|
|
memcpy(bp->b_data, space, fs->fs_bsize);
|
|
space = (char *)space + fs->fs_bsize;
|
|
bawrite(bp);
|
|
}
|
|
if (error)
|
|
goto out;
|
|
error = bread(vp, ffs_lblkno(fs, fs->fs_sblockloc),
|
|
fs->fs_bsize, l->l_cred, B_MODIFY, &bp);
|
|
if (error) {
|
|
goto out;
|
|
} else {
|
|
memcpy(bp->b_data, sbbuf, fs->fs_bsize);
|
|
bawrite(bp);
|
|
}
|
|
/*
|
|
* Copy the first UFS_NDADDR blocks to the snapshot so
|
|
* ffs_copyonwrite() and ffs_snapblkfree() will always work on
|
|
* indirect blocks.
|
|
*/
|
|
for (loc = 0; loc < UFS_NDADDR; loc++) {
|
|
if (db_get(ip, loc) != 0)
|
|
continue;
|
|
error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)loc),
|
|
fs->fs_bsize, l->l_cred, 0, &bp);
|
|
if (error)
|
|
break;
|
|
error = rwfsblk(vp, B_READ, bp->b_data, loc);
|
|
if (error) {
|
|
brelse(bp, 0);
|
|
break;
|
|
}
|
|
bawrite(bp);
|
|
}
|
|
|
|
out:
|
|
UFS_WAPBL_END(mp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Copy all cylinder group maps.
|
|
*/
|
|
static int
|
|
cgaccount(struct vnode *vp, int passno, int *redo)
|
|
{
|
|
int cg, error = 0;
|
|
struct buf *nbp;
|
|
struct fs *fs = VTOI(vp)->i_fs;
|
|
|
|
if (redo != NULL)
|
|
*redo = 0;
|
|
if (passno == 1)
|
|
fs->fs_active = malloc(howmany(fs->fs_ncg, NBBY),
|
|
M_DEVBUF, M_WAITOK | M_ZERO);
|
|
for (cg = 0; cg < fs->fs_ncg; cg++) {
|
|
if (passno == 2 && ACTIVECG_ISSET(fs, cg))
|
|
continue;
|
|
|
|
if (redo != NULL)
|
|
*redo += 1;
|
|
error = UFS_WAPBL_BEGIN(vp->v_mount);
|
|
if (error)
|
|
return error;
|
|
error = ffs_balloc(vp, ffs_lfragtosize(fs, cgtod(fs, cg)),
|
|
fs->fs_bsize, curlwp->l_cred, 0, &nbp);
|
|
if (error) {
|
|
UFS_WAPBL_END(vp->v_mount);
|
|
break;
|
|
}
|
|
error = cgaccount1(cg, vp, nbp->b_data, passno);
|
|
bawrite(nbp);
|
|
UFS_WAPBL_END(vp->v_mount);
|
|
if (error)
|
|
break;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Copy a cylinder group map. All the unallocated blocks are marked
|
|
* BLK_NOCOPY so that the snapshot knows that it need not copy them
|
|
* if they are later written. If passno is one, then this is a first
|
|
* pass, so only setting needs to be done. If passno is 2, then this
|
|
* is a revision to a previous pass which must be undone as the
|
|
* replacement pass is done.
|
|
*/
|
|
static int
|
|
cgaccount1(int cg, struct vnode *vp, void *data, int passno)
|
|
{
|
|
struct buf *bp, *ibp;
|
|
struct inode *ip;
|
|
struct cg *cgp;
|
|
struct fs *fs;
|
|
struct lwp *l = curlwp;
|
|
daddr_t base, numblks;
|
|
int error, len, loc, ns __unused, indiroff;
|
|
|
|
ip = VTOI(vp);
|
|
fs = ip->i_fs;
|
|
ns = UFS_FSNEEDSWAP(fs);
|
|
error = bread(ip->i_devvp, FFS_FSBTODB(fs, cgtod(fs, cg)),
|
|
(int)fs->fs_cgsize, l->l_cred, 0, &bp);
|
|
if (error) {
|
|
return (error);
|
|
}
|
|
cgp = (struct cg *)bp->b_data;
|
|
if (!cg_chkmagic(cgp, ns)) {
|
|
brelse(bp, 0);
|
|
return (EIO);
|
|
}
|
|
ACTIVECG_SET(fs, cg);
|
|
|
|
memcpy(data, bp->b_data, fs->fs_cgsize);
|
|
brelse(bp, 0);
|
|
if (fs->fs_cgsize < fs->fs_bsize)
|
|
memset((char *)data + fs->fs_cgsize, 0,
|
|
fs->fs_bsize - fs->fs_cgsize);
|
|
numblks = howmany(fs->fs_size, fs->fs_frag);
|
|
len = howmany(fs->fs_fpg, fs->fs_frag);
|
|
base = cg * fs->fs_fpg / fs->fs_frag;
|
|
if (base + len >= numblks)
|
|
len = numblks - base - 1;
|
|
loc = 0;
|
|
if (base < UFS_NDADDR) {
|
|
for ( ; loc < UFS_NDADDR; loc++) {
|
|
if (ffs_isblock(fs, cg_blksfree(cgp, ns), loc))
|
|
db_assign(ip, loc, BLK_NOCOPY);
|
|
else if (db_get(ip, loc) == BLK_NOCOPY) {
|
|
if (passno == 2)
|
|
db_assign(ip, loc, 0);
|
|
else if (passno == 1)
|
|
panic("ffs_snapshot: lost direct block");
|
|
}
|
|
}
|
|
}
|
|
if ((error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)(base + loc)),
|
|
fs->fs_bsize, l->l_cred, B_METAONLY, &ibp)) != 0)
|
|
return (error);
|
|
indiroff = (base + loc - UFS_NDADDR) % FFS_NINDIR(fs);
|
|
for ( ; loc < len; loc++, indiroff++) {
|
|
if (indiroff >= FFS_NINDIR(fs)) {
|
|
bawrite(ibp);
|
|
if ((error = ffs_balloc(vp,
|
|
ffs_lblktosize(fs, (off_t)(base + loc)),
|
|
fs->fs_bsize, l->l_cred, B_METAONLY, &ibp)) != 0)
|
|
return (error);
|
|
indiroff = 0;
|
|
}
|
|
if (ffs_isblock(fs, cg_blksfree(cgp, ns), loc))
|
|
idb_assign(ip, ibp->b_data, indiroff, BLK_NOCOPY);
|
|
else if (idb_get(ip, ibp->b_data, indiroff) == BLK_NOCOPY) {
|
|
if (passno == 2)
|
|
idb_assign(ip, ibp->b_data, indiroff, 0);
|
|
else if (passno == 1)
|
|
panic("ffs_snapshot: lost indirect block");
|
|
}
|
|
}
|
|
bdwrite(ibp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Before expunging a snapshot inode, note all the
|
|
* blocks that it claims with BLK_SNAP so that fsck will
|
|
* be able to account for those blocks properly and so
|
|
* that this snapshot knows that it need not copy them
|
|
* if the other snapshot holding them is freed.
|
|
*/
|
|
static int
|
|
expunge(struct vnode *snapvp, struct inode *cancelip, struct fs *fs,
|
|
acctfunc_t acctfunc, int expungetype)
|
|
{
|
|
int i, error, ns __unused;
|
|
daddr_t lbn, rlbn;
|
|
daddr_t len, blkno, numblks, blksperindir;
|
|
struct ufs1_dinode *dip1;
|
|
struct ufs2_dinode *dip2;
|
|
struct lwp *l = curlwp;
|
|
void *bap;
|
|
struct buf *bp;
|
|
struct mount *mp;
|
|
|
|
ns = UFS_FSNEEDSWAP(fs);
|
|
mp = snapvp->v_mount;
|
|
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Prepare to expunge the inode. If its inode block has not
|
|
* yet been copied, then allocate and fill the copy.
|
|
*/
|
|
lbn = ffs_fragstoblks(fs, ino_to_fsba(fs, cancelip->i_number));
|
|
error = snapblkaddr(snapvp, lbn, &blkno);
|
|
if (error)
|
|
return error;
|
|
if (blkno != 0) {
|
|
error = bread(snapvp, lbn, fs->fs_bsize, l->l_cred,
|
|
B_MODIFY, &bp);
|
|
} else {
|
|
error = ffs_balloc(snapvp, ffs_lblktosize(fs, (off_t)lbn),
|
|
fs->fs_bsize, l->l_cred, 0, &bp);
|
|
if (! error)
|
|
error = rwfsblk(snapvp, B_READ, bp->b_data, lbn);
|
|
}
|
|
if (error) {
|
|
UFS_WAPBL_END(mp);
|
|
return error;
|
|
}
|
|
/*
|
|
* Set a snapshot inode to be a zero length file, regular files
|
|
* or unlinked snapshots to be completely unallocated.
|
|
*/
|
|
if (fs->fs_magic == FS_UFS1_MAGIC) {
|
|
dip1 = (struct ufs1_dinode *)bp->b_data +
|
|
ino_to_fsbo(fs, cancelip->i_number);
|
|
if (cancelip->i_flags & SF_SNAPSHOT) {
|
|
dip1->di_flags =
|
|
ufs_rw32(ufs_rw32(dip1->di_flags, ns) |
|
|
SF_SNAPINVAL, ns);
|
|
}
|
|
if (expungetype == BLK_NOCOPY || cancelip->i_nlink == 0)
|
|
dip1->di_mode = 0;
|
|
dip1->di_size = 0;
|
|
dip1->di_blocks = 0;
|
|
memset(&dip1->di_db[0], 0, (UFS_NDADDR + UFS_NIADDR) * sizeof(int32_t));
|
|
} else {
|
|
dip2 = (struct ufs2_dinode *)bp->b_data +
|
|
ino_to_fsbo(fs, cancelip->i_number);
|
|
if (cancelip->i_flags & SF_SNAPSHOT) {
|
|
dip2->di_flags =
|
|
ufs_rw32(ufs_rw32(dip2->di_flags, ns) |
|
|
SF_SNAPINVAL, ns);
|
|
}
|
|
if (expungetype == BLK_NOCOPY || cancelip->i_nlink == 0)
|
|
dip2->di_mode = 0;
|
|
dip2->di_size = 0;
|
|
dip2->di_blocks = 0;
|
|
memset(&dip2->di_db[0], 0, (UFS_NDADDR + UFS_NIADDR) * sizeof(int64_t));
|
|
}
|
|
bdwrite(bp);
|
|
UFS_WAPBL_END(mp);
|
|
/*
|
|
* Now go through and expunge all the blocks in the file
|
|
* using the function requested.
|
|
*/
|
|
numblks = howmany(cancelip->i_size, fs->fs_bsize);
|
|
if (fs->fs_magic == FS_UFS1_MAGIC)
|
|
bap = &cancelip->i_ffs1_db[0];
|
|
else
|
|
bap = &cancelip->i_ffs2_db[0];
|
|
error = (*acctfunc)(snapvp, bap, 0, UFS_NDADDR, fs, 0, expungetype);
|
|
if (error)
|
|
return (error);
|
|
if (fs->fs_magic == FS_UFS1_MAGIC)
|
|
bap = &cancelip->i_ffs1_ib[0];
|
|
else
|
|
bap = &cancelip->i_ffs2_ib[0];
|
|
error = (*acctfunc)(snapvp, bap, 0, UFS_NIADDR, fs, -1, expungetype);
|
|
if (error)
|
|
return (error);
|
|
blksperindir = 1;
|
|
lbn = -UFS_NDADDR;
|
|
len = numblks - UFS_NDADDR;
|
|
rlbn = UFS_NDADDR;
|
|
for (i = 0; len > 0 && i < UFS_NIADDR; i++) {
|
|
error = indiracct(snapvp, ITOV(cancelip), i,
|
|
ib_get(cancelip, i), lbn, rlbn, len,
|
|
blksperindir, fs, acctfunc, expungetype);
|
|
if (error)
|
|
return (error);
|
|
blksperindir *= FFS_NINDIR(fs);
|
|
lbn -= blksperindir + 1;
|
|
len -= blksperindir;
|
|
rlbn += blksperindir;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Descend an indirect block chain for vnode cancelvp accounting for all
|
|
* its indirect blocks in snapvp.
|
|
*/
|
|
static int
|
|
indiracct(struct vnode *snapvp, struct vnode *cancelvp, int level,
|
|
daddr_t blkno, daddr_t lbn, daddr_t rlbn, daddr_t remblks,
|
|
daddr_t blksperindir, struct fs *fs, acctfunc_t acctfunc, int expungetype)
|
|
{
|
|
int error, num, i;
|
|
daddr_t subblksperindir;
|
|
struct indir indirs[UFS_NIADDR + 2];
|
|
daddr_t last;
|
|
void *bap;
|
|
struct buf *bp;
|
|
|
|
if (blkno == 0) {
|
|
if (expungetype == BLK_NOCOPY)
|
|
return (0);
|
|
panic("indiracct: missing indir");
|
|
}
|
|
if ((error = ufs_getlbns(cancelvp, rlbn, indirs, &num)) != 0)
|
|
return (error);
|
|
if (lbn != indirs[num - 1 - level].in_lbn || num < 2)
|
|
panic("indiracct: botched params");
|
|
/*
|
|
* We have to expand bread here since it will deadlock looking
|
|
* up the block number for any blocks that are not in the cache.
|
|
*/
|
|
error = ffs_getblk(cancelvp, lbn, FFS_FSBTODB(fs, blkno), fs->fs_bsize,
|
|
false, &bp);
|
|
if (error)
|
|
return error;
|
|
if ((bp->b_oflags & (BO_DONE | BO_DELWRI)) == 0 && (error =
|
|
rwfsblk(bp->b_vp, B_READ, bp->b_data, ffs_fragstoblks(fs, blkno)))) {
|
|
brelse(bp, 0);
|
|
return (error);
|
|
}
|
|
/*
|
|
* Account for the block pointers in this indirect block.
|
|
*/
|
|
last = howmany(remblks, blksperindir);
|
|
if (last > FFS_NINDIR(fs))
|
|
last = FFS_NINDIR(fs);
|
|
bap = malloc(fs->fs_bsize, M_DEVBUF, M_WAITOK | M_ZERO);
|
|
memcpy((void *)bap, bp->b_data, fs->fs_bsize);
|
|
brelse(bp, 0);
|
|
error = (*acctfunc)(snapvp, bap, 0, last,
|
|
fs, level == 0 ? rlbn : -1, expungetype);
|
|
if (error || level == 0)
|
|
goto out;
|
|
/*
|
|
* Account for the block pointers in each of the indirect blocks
|
|
* in the levels below us.
|
|
*/
|
|
subblksperindir = blksperindir / FFS_NINDIR(fs);
|
|
for (lbn++, level--, i = 0; i < last; i++) {
|
|
error = indiracct(snapvp, cancelvp, level,
|
|
idb_get(VTOI(snapvp), bap, i), lbn, rlbn, remblks,
|
|
subblksperindir, fs, acctfunc, expungetype);
|
|
if (error)
|
|
goto out;
|
|
rlbn += blksperindir;
|
|
lbn -= blksperindir;
|
|
remblks -= blksperindir;
|
|
}
|
|
out:
|
|
free(bap, M_DEVBUF);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Do both snap accounting and map accounting.
|
|
*/
|
|
static int
|
|
fullacct(struct vnode *vp, void *bap, int oldblkp, int lastblkp,
|
|
struct fs *fs, daddr_t lblkno,
|
|
int exptype /* BLK_SNAP or BLK_NOCOPY */)
|
|
{
|
|
int error;
|
|
|
|
if ((error = snapacct(vp, bap, oldblkp, lastblkp, fs, lblkno, exptype)))
|
|
return (error);
|
|
return (mapacct(vp, bap, oldblkp, lastblkp, fs, lblkno, exptype));
|
|
}
|
|
|
|
/*
|
|
* Identify a set of blocks allocated in a snapshot inode.
|
|
*/
|
|
static int
|
|
snapacct(struct vnode *vp, void *bap, int oldblkp, int lastblkp,
|
|
struct fs *fs, daddr_t lblkno,
|
|
int expungetype /* BLK_SNAP or BLK_NOCOPY */)
|
|
{
|
|
struct inode *ip = VTOI(vp);
|
|
struct lwp *l = curlwp;
|
|
struct mount *mp = vp->v_mount;
|
|
daddr_t blkno;
|
|
daddr_t lbn;
|
|
struct buf *ibp;
|
|
int error, n;
|
|
const int wbreak = blocks_in_journal(VFSTOUFS(mp)->um_fs)/8;
|
|
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
for ( n = 0; oldblkp < lastblkp; oldblkp++) {
|
|
blkno = idb_get(ip, bap, oldblkp);
|
|
if (blkno == 0 || blkno == BLK_NOCOPY || blkno == BLK_SNAP)
|
|
continue;
|
|
lbn = ffs_fragstoblks(fs, blkno);
|
|
if (lbn < UFS_NDADDR) {
|
|
blkno = db_get(ip, lbn);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
} else {
|
|
error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)lbn),
|
|
fs->fs_bsize, l->l_cred, B_METAONLY, &ibp);
|
|
if (error)
|
|
break;
|
|
blkno = idb_get(ip, ibp->b_data,
|
|
(lbn - UFS_NDADDR) % FFS_NINDIR(fs));
|
|
}
|
|
/*
|
|
* If we are expunging a snapshot vnode and we
|
|
* find a block marked BLK_NOCOPY, then it is
|
|
* one that has been allocated to this snapshot after
|
|
* we took our current snapshot and can be ignored.
|
|
*/
|
|
if (expungetype == BLK_SNAP && blkno == BLK_NOCOPY) {
|
|
if (lbn >= UFS_NDADDR)
|
|
brelse(ibp, 0);
|
|
} else {
|
|
if (blkno != 0)
|
|
panic("snapacct: bad block");
|
|
if (lbn < UFS_NDADDR)
|
|
db_assign(ip, lbn, expungetype);
|
|
else {
|
|
idb_assign(ip, ibp->b_data,
|
|
(lbn - UFS_NDADDR) % FFS_NINDIR(fs), expungetype);
|
|
bdwrite(ibp);
|
|
}
|
|
}
|
|
if (wbreak > 0 && (++n % wbreak) == 0) {
|
|
UFS_WAPBL_END(mp);
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
UFS_WAPBL_END(mp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Account for a set of blocks allocated in a snapshot inode.
|
|
*/
|
|
static int
|
|
mapacct(struct vnode *vp, void *bap, int oldblkp, int lastblkp,
|
|
struct fs *fs, daddr_t lblkno, int expungetype)
|
|
{
|
|
daddr_t blkno;
|
|
struct inode *ip;
|
|
struct mount *mp = vp->v_mount;
|
|
ino_t inum;
|
|
int acctit, error, n;
|
|
const int wbreak = blocks_in_journal(VFSTOUFS(mp)->um_fs)/8;
|
|
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
ip = VTOI(vp);
|
|
inum = ip->i_number;
|
|
if (lblkno == -1)
|
|
acctit = 0;
|
|
else
|
|
acctit = 1;
|
|
for ( n = 0; oldblkp < lastblkp; oldblkp++, lblkno++) {
|
|
blkno = idb_get(ip, bap, oldblkp);
|
|
if (blkno == 0 || blkno == BLK_NOCOPY)
|
|
continue;
|
|
if (acctit && expungetype == BLK_SNAP && blkno != BLK_SNAP)
|
|
*ip->i_snapblklist++ = lblkno;
|
|
if (blkno == BLK_SNAP)
|
|
blkno = ffs_blkstofrags(fs, lblkno);
|
|
ffs_blkfree_snap(fs, vp, blkno, fs->fs_bsize, inum);
|
|
if (wbreak > 0 && (++n % wbreak) == 0) {
|
|
UFS_WAPBL_END(mp);
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
UFS_WAPBL_END(mp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Number of blocks that fit into the journal or zero if not logging.
|
|
*/
|
|
static int
|
|
blocks_in_journal(struct fs *fs)
|
|
{
|
|
off_t bpj;
|
|
|
|
if ((fs->fs_flags & FS_DOWAPBL) == 0)
|
|
return 0;
|
|
bpj = 1;
|
|
if (fs->fs_journal_version == UFS_WAPBL_VERSION) {
|
|
switch (fs->fs_journal_location) {
|
|
case UFS_WAPBL_JOURNALLOC_END_PARTITION:
|
|
bpj = (off_t)fs->fs_journallocs[UFS_WAPBL_EPART_BLKSZ]*
|
|
fs->fs_journallocs[UFS_WAPBL_EPART_COUNT];
|
|
break;
|
|
case UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM:
|
|
bpj = (off_t)fs->fs_journallocs[UFS_WAPBL_INFS_BLKSZ]*
|
|
fs->fs_journallocs[UFS_WAPBL_INFS_COUNT];
|
|
break;
|
|
}
|
|
}
|
|
bpj /= fs->fs_bsize;
|
|
return (bpj > 0 ? bpj : 1);
|
|
}
|
|
#endif /* defined(FFS_NO_SNAPSHOT) */
|
|
|
|
/*
|
|
* Decrement extra reference on snapshot when last name is removed.
|
|
* It will not be freed until the last open reference goes away.
|
|
*/
|
|
void
|
|
ffs_snapgone(struct vnode *vp)
|
|
{
|
|
struct inode *xp, *ip = VTOI(vp);
|
|
struct mount *mp = spec_node_getmountedfs(ip->i_devvp);
|
|
struct fs *fs;
|
|
struct snap_info *si;
|
|
int snaploc;
|
|
|
|
si = VFSTOUFS(mp)->um_snapinfo;
|
|
|
|
/*
|
|
* Find snapshot in incore list.
|
|
*/
|
|
mutex_enter(&si->si_lock);
|
|
TAILQ_FOREACH(xp, &si->si_snapshots, i_nextsnap)
|
|
if (xp == ip)
|
|
break;
|
|
mutex_exit(&si->si_lock);
|
|
if (xp != NULL)
|
|
vrele(ITOV(ip));
|
|
#ifdef DEBUG
|
|
else if (snapdebug)
|
|
printf("ffs_snapgone: lost snapshot vnode %llu\n",
|
|
(unsigned long long)ip->i_number);
|
|
#endif
|
|
/*
|
|
* Delete snapshot inode from superblock. Keep list dense.
|
|
*/
|
|
mutex_enter(&si->si_lock);
|
|
fs = ip->i_fs;
|
|
for (snaploc = 0; snaploc < FSMAXSNAP; snaploc++)
|
|
if (fs->fs_snapinum[snaploc] == ip->i_number)
|
|
break;
|
|
if (snaploc < FSMAXSNAP) {
|
|
for (snaploc++; snaploc < FSMAXSNAP; snaploc++) {
|
|
if (fs->fs_snapinum[snaploc] == 0)
|
|
break;
|
|
fs->fs_snapinum[snaploc - 1] = fs->fs_snapinum[snaploc];
|
|
}
|
|
fs->fs_snapinum[snaploc - 1] = 0;
|
|
}
|
|
si->si_gen++;
|
|
mutex_exit(&si->si_lock);
|
|
}
|
|
|
|
/*
|
|
* Prepare a snapshot file for being removed.
|
|
*/
|
|
void
|
|
ffs_snapremove(struct vnode *vp)
|
|
{
|
|
struct inode *ip = VTOI(vp), *xp;
|
|
struct vnode *devvp = ip->i_devvp;
|
|
struct fs *fs = ip->i_fs;
|
|
struct mount *mp = spec_node_getmountedfs(devvp);
|
|
struct buf *ibp;
|
|
struct snap_info *si;
|
|
struct lwp *l = curlwp;
|
|
daddr_t numblks, blkno, dblk;
|
|
int error, loc, last;
|
|
|
|
si = VFSTOUFS(mp)->um_snapinfo;
|
|
/*
|
|
* If active, delete from incore list (this snapshot may
|
|
* already have been in the process of being deleted, so
|
|
* would not have been active).
|
|
*
|
|
* Clear copy-on-write flag if last snapshot.
|
|
*/
|
|
mutex_enter(&si->si_snaplock);
|
|
mutex_enter(&si->si_lock);
|
|
if (is_active_snapshot(si, ip)) {
|
|
TAILQ_REMOVE(&si->si_snapshots, ip, i_nextsnap);
|
|
if (TAILQ_FIRST(&si->si_snapshots) != 0) {
|
|
/* Roll back the list of preallocated blocks. */
|
|
xp = TAILQ_LAST(&si->si_snapshots, inodelst);
|
|
si->si_snapblklist = xp->i_snapblklist;
|
|
si->si_gen++;
|
|
mutex_exit(&si->si_lock);
|
|
mutex_exit(&si->si_snaplock);
|
|
} else {
|
|
si->si_snapblklist = 0;
|
|
si->si_gen++;
|
|
mutex_exit(&si->si_lock);
|
|
mutex_exit(&si->si_snaplock);
|
|
fscow_disestablish(mp, ffs_copyonwrite, devvp);
|
|
}
|
|
if (ip->i_snapblklist != NULL) {
|
|
free(ip->i_snapblklist, M_UFSMNT);
|
|
ip->i_snapblklist = NULL;
|
|
}
|
|
} else {
|
|
mutex_exit(&si->si_lock);
|
|
mutex_exit(&si->si_snaplock);
|
|
}
|
|
/*
|
|
* Clear all BLK_NOCOPY fields. Pass any block claims to other
|
|
* snapshots that want them (see ffs_snapblkfree below).
|
|
*/
|
|
for (blkno = 1; blkno < UFS_NDADDR; blkno++) {
|
|
dblk = db_get(ip, blkno);
|
|
if (dblk == BLK_NOCOPY || dblk == BLK_SNAP)
|
|
db_assign(ip, blkno, 0);
|
|
else if ((dblk == ffs_blkstofrags(fs, blkno) &&
|
|
ffs_snapblkfree(fs, ip->i_devvp, dblk, fs->fs_bsize,
|
|
ip->i_number))) {
|
|
DIP_ADD(ip, blocks, -btodb(fs->fs_bsize));
|
|
db_assign(ip, blkno, 0);
|
|
}
|
|
}
|
|
numblks = howmany(ip->i_size, fs->fs_bsize);
|
|
for (blkno = UFS_NDADDR; blkno < numblks; blkno += FFS_NINDIR(fs)) {
|
|
error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)blkno),
|
|
fs->fs_bsize, l->l_cred, B_METAONLY, &ibp);
|
|
if (error)
|
|
continue;
|
|
if (fs->fs_size - blkno > FFS_NINDIR(fs))
|
|
last = FFS_NINDIR(fs);
|
|
else
|
|
last = fs->fs_size - blkno;
|
|
for (loc = 0; loc < last; loc++) {
|
|
dblk = idb_get(ip, ibp->b_data, loc);
|
|
if (dblk == BLK_NOCOPY || dblk == BLK_SNAP)
|
|
idb_assign(ip, ibp->b_data, loc, 0);
|
|
else if (dblk == ffs_blkstofrags(fs, blkno) &&
|
|
ffs_snapblkfree(fs, ip->i_devvp, dblk,
|
|
fs->fs_bsize, ip->i_number)) {
|
|
DIP_ADD(ip, blocks, -btodb(fs->fs_bsize));
|
|
idb_assign(ip, ibp->b_data, loc, 0);
|
|
}
|
|
}
|
|
bawrite(ibp);
|
|
UFS_WAPBL_END(mp);
|
|
error = UFS_WAPBL_BEGIN(mp);
|
|
KASSERT(error == 0);
|
|
}
|
|
/*
|
|
* Clear snapshot flag and drop reference.
|
|
*/
|
|
ip->i_flags &= ~(SF_SNAPSHOT | SF_SNAPINVAL);
|
|
DIP_ASSIGN(ip, flags, ip->i_flags);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
#if defined(QUOTA) || defined(QUOTA2)
|
|
chkdq(ip, DIP(ip, blocks), l->l_cred, FORCE);
|
|
chkiq(ip, 1, l->l_cred, FORCE);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Notification that a block is being freed. Return zero if the free
|
|
* should be allowed to proceed. Return non-zero if the snapshot file
|
|
* wants to claim the block. The block will be claimed if it is an
|
|
* uncopied part of one of the snapshots. It will be freed if it is
|
|
* either a BLK_NOCOPY or has already been copied in all of the snapshots.
|
|
* If a fragment is being freed, then all snapshots that care about
|
|
* it must make a copy since a snapshot file can only claim full sized
|
|
* blocks. Note that if more than one snapshot file maps the block,
|
|
* we can pick one at random to claim it. Since none of the snapshots
|
|
* can change, we are assurred that they will all see the same unmodified
|
|
* image. When deleting a snapshot file (see ffs_snapremove above), we
|
|
* must push any of these claimed blocks to one of the other snapshots
|
|
* that maps it. These claimed blocks are easily identified as they will
|
|
* have a block number equal to their logical block number within the
|
|
* snapshot. A copied block can never have this property because they
|
|
* must always have been allocated from a BLK_NOCOPY location.
|
|
*/
|
|
int
|
|
ffs_snapblkfree(struct fs *fs, struct vnode *devvp, daddr_t bno,
|
|
long size, ino_t inum)
|
|
{
|
|
struct mount *mp = spec_node_getmountedfs(devvp);
|
|
struct buf *ibp;
|
|
struct inode *ip;
|
|
struct vnode *vp = NULL;
|
|
struct snap_info *si;
|
|
void *saved_data = NULL;
|
|
daddr_t lbn;
|
|
daddr_t blkno;
|
|
uint32_t gen;
|
|
int indiroff = 0, error = 0, claimedblk = 0;
|
|
|
|
si = VFSTOUFS(mp)->um_snapinfo;
|
|
lbn = ffs_fragstoblks(fs, bno);
|
|
mutex_enter(&si->si_snaplock);
|
|
mutex_enter(&si->si_lock);
|
|
si->si_owner = curlwp;
|
|
|
|
retry:
|
|
gen = si->si_gen;
|
|
TAILQ_FOREACH(ip, &si->si_snapshots, i_nextsnap) {
|
|
vp = ITOV(ip);
|
|
/*
|
|
* Lookup block being written.
|
|
*/
|
|
if (lbn < UFS_NDADDR) {
|
|
blkno = db_get(ip, lbn);
|
|
} else {
|
|
mutex_exit(&si->si_lock);
|
|
error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)lbn),
|
|
fs->fs_bsize, FSCRED, B_METAONLY, &ibp);
|
|
if (error) {
|
|
mutex_enter(&si->si_lock);
|
|
break;
|
|
}
|
|
indiroff = (lbn - UFS_NDADDR) % FFS_NINDIR(fs);
|
|
blkno = idb_get(ip, ibp->b_data, indiroff);
|
|
mutex_enter(&si->si_lock);
|
|
if (gen != si->si_gen) {
|
|
brelse(ibp, 0);
|
|
goto retry;
|
|
}
|
|
}
|
|
/*
|
|
* Check to see if block needs to be copied.
|
|
*/
|
|
if (blkno == 0) {
|
|
/*
|
|
* A block that we map is being freed. If it has not
|
|
* been claimed yet, we will claim or copy it (below).
|
|
*/
|
|
claimedblk = 1;
|
|
} else if (blkno == BLK_SNAP) {
|
|
/*
|
|
* No previous snapshot claimed the block,
|
|
* so it will be freed and become a BLK_NOCOPY
|
|
* (don't care) for us.
|
|
*/
|
|
if (claimedblk)
|
|
panic("snapblkfree: inconsistent block type");
|
|
if (lbn < UFS_NDADDR) {
|
|
db_assign(ip, lbn, BLK_NOCOPY);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
} else {
|
|
idb_assign(ip, ibp->b_data, indiroff,
|
|
BLK_NOCOPY);
|
|
mutex_exit(&si->si_lock);
|
|
if (ip->i_nlink > 0)
|
|
bwrite(ibp);
|
|
else
|
|
bdwrite(ibp);
|
|
mutex_enter(&si->si_lock);
|
|
if (gen != si->si_gen)
|
|
goto retry;
|
|
}
|
|
continue;
|
|
} else /* BLK_NOCOPY or default */ {
|
|
/*
|
|
* If the snapshot has already copied the block
|
|
* (default), or does not care about the block,
|
|
* it is not needed.
|
|
*/
|
|
if (lbn >= UFS_NDADDR)
|
|
brelse(ibp, 0);
|
|
continue;
|
|
}
|
|
/*
|
|
* If this is a full size block, we will just grab it
|
|
* and assign it to the snapshot inode. Otherwise we
|
|
* will proceed to copy it. See explanation for this
|
|
* routine as to why only a single snapshot needs to
|
|
* claim this block.
|
|
*/
|
|
if (size == fs->fs_bsize) {
|
|
#ifdef DEBUG
|
|
if (snapdebug)
|
|
printf("%s %llu lbn %" PRId64
|
|
"from inum %llu\n",
|
|
"Grabonremove: snapino",
|
|
(unsigned long long)ip->i_number,
|
|
lbn, (unsigned long long)inum);
|
|
#endif
|
|
mutex_exit(&si->si_lock);
|
|
if (lbn < UFS_NDADDR) {
|
|
db_assign(ip, lbn, bno);
|
|
} else {
|
|
idb_assign(ip, ibp->b_data, indiroff, bno);
|
|
if (ip->i_nlink > 0)
|
|
bwrite(ibp);
|
|
else
|
|
bdwrite(ibp);
|
|
}
|
|
DIP_ADD(ip, blocks, btodb(size));
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
if (ip->i_nlink > 0 && mp->mnt_wapbl)
|
|
error = syncsnap(vp);
|
|
else
|
|
error = 0;
|
|
mutex_enter(&si->si_lock);
|
|
si->si_owner = NULL;
|
|
mutex_exit(&si->si_lock);
|
|
mutex_exit(&si->si_snaplock);
|
|
return (error == 0);
|
|
}
|
|
if (lbn >= UFS_NDADDR)
|
|
brelse(ibp, 0);
|
|
#ifdef DEBUG
|
|
if (snapdebug)
|
|
printf("%s%llu lbn %" PRId64 " %s %llu size %ld\n",
|
|
"Copyonremove: snapino ",
|
|
(unsigned long long)ip->i_number,
|
|
lbn, "for inum", (unsigned long long)inum, size);
|
|
#endif
|
|
/*
|
|
* If we have already read the old block contents, then
|
|
* simply copy them to the new block. Note that we need
|
|
* to synchronously write snapshots that have not been
|
|
* unlinked, and hence will be visible after a crash,
|
|
* to ensure their integrity.
|
|
*/
|
|
mutex_exit(&si->si_lock);
|
|
if (saved_data == NULL) {
|
|
saved_data = malloc(fs->fs_bsize, M_UFSMNT, M_WAITOK);
|
|
error = rwfsblk(vp, B_READ, saved_data, lbn);
|
|
if (error) {
|
|
free(saved_data, M_UFSMNT);
|
|
saved_data = NULL;
|
|
mutex_enter(&si->si_lock);
|
|
break;
|
|
}
|
|
}
|
|
error = wrsnapblk(vp, saved_data, lbn);
|
|
if (error == 0 && ip->i_nlink > 0 && mp->mnt_wapbl)
|
|
error = syncsnap(vp);
|
|
mutex_enter(&si->si_lock);
|
|
if (error)
|
|
break;
|
|
if (gen != si->si_gen)
|
|
goto retry;
|
|
}
|
|
si->si_owner = NULL;
|
|
mutex_exit(&si->si_lock);
|
|
mutex_exit(&si->si_snaplock);
|
|
if (saved_data)
|
|
free(saved_data, M_UFSMNT);
|
|
/*
|
|
* If we have been unable to allocate a block in which to do
|
|
* the copy, then return non-zero so that the fragment will
|
|
* not be freed. Although space will be lost, the snapshot
|
|
* will stay consistent.
|
|
*/
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Associate snapshot files when mounting.
|
|
*/
|
|
void
|
|
ffs_snapshot_mount(struct mount *mp)
|
|
{
|
|
struct vnode *devvp = VFSTOUFS(mp)->um_devvp;
|
|
struct fs *fs = VFSTOUFS(mp)->um_fs;
|
|
struct lwp *l = curlwp;
|
|
struct vnode *vp;
|
|
struct inode *ip, *xp;
|
|
struct snap_info *si;
|
|
daddr_t snaplistsize, *snapblklist;
|
|
int i, error, ns __unused, snaploc, loc;
|
|
|
|
/*
|
|
* No persistent snapshots on apple ufs file systems.
|
|
*/
|
|
if (UFS_MPISAPPLEUFS(VFSTOUFS(mp)))
|
|
return;
|
|
|
|
si = VFSTOUFS(mp)->um_snapinfo;
|
|
ns = UFS_FSNEEDSWAP(fs);
|
|
/*
|
|
* XXX The following needs to be set before ffs_truncate or
|
|
* VOP_READ can be called.
|
|
*/
|
|
mp->mnt_stat.f_iosize = fs->fs_bsize;
|
|
/*
|
|
* Process each snapshot listed in the superblock.
|
|
*/
|
|
vp = NULL;
|
|
mutex_enter(&si->si_lock);
|
|
for (snaploc = 0; snaploc < FSMAXSNAP; snaploc++) {
|
|
if (fs->fs_snapinum[snaploc] == 0)
|
|
break;
|
|
if ((error = VFS_VGET(mp, fs->fs_snapinum[snaploc],
|
|
&vp)) != 0) {
|
|
printf("ffs_snapshot_mount: vget failed %d\n", error);
|
|
continue;
|
|
}
|
|
ip = VTOI(vp);
|
|
if ((ip->i_flags & (SF_SNAPSHOT | SF_SNAPINVAL)) !=
|
|
SF_SNAPSHOT) {
|
|
printf("ffs_snapshot_mount: non-snapshot inode %d\n",
|
|
fs->fs_snapinum[snaploc]);
|
|
vput(vp);
|
|
vp = NULL;
|
|
for (loc = snaploc + 1; loc < FSMAXSNAP; loc++) {
|
|
if (fs->fs_snapinum[loc] == 0)
|
|
break;
|
|
fs->fs_snapinum[loc - 1] = fs->fs_snapinum[loc];
|
|
}
|
|
fs->fs_snapinum[loc - 1] = 0;
|
|
snaploc--;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Read the block hints list. Use an empty list on
|
|
* read errors.
|
|
*/
|
|
error = vn_rdwr(UIO_READ, vp,
|
|
(void *)&snaplistsize, sizeof(snaplistsize),
|
|
ffs_lblktosize(fs, howmany(fs->fs_size, fs->fs_frag)),
|
|
UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT|IO_ALTSEMANTICS,
|
|
l->l_cred, NULL, NULL);
|
|
if (error) {
|
|
printf("ffs_snapshot_mount: read_1 failed %d\n", error);
|
|
snaplistsize = 1;
|
|
} else
|
|
snaplistsize = ufs_rw64(snaplistsize, ns);
|
|
snapblklist = malloc(
|
|
snaplistsize * sizeof(daddr_t), M_UFSMNT, M_WAITOK);
|
|
if (error)
|
|
snapblklist[0] = 1;
|
|
else {
|
|
error = vn_rdwr(UIO_READ, vp, (void *)snapblklist,
|
|
snaplistsize * sizeof(daddr_t),
|
|
ffs_lblktosize(fs, howmany(fs->fs_size, fs->fs_frag)),
|
|
UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT|IO_ALTSEMANTICS,
|
|
l->l_cred, NULL, NULL);
|
|
for (i = 0; i < snaplistsize; i++)
|
|
snapblklist[i] = ufs_rw64(snapblklist[i], ns);
|
|
if (error) {
|
|
printf("ffs_snapshot_mount: read_2 failed %d\n",
|
|
error);
|
|
snapblklist[0] = 1;
|
|
}
|
|
}
|
|
ip->i_snapblklist = &snapblklist[0];
|
|
|
|
/*
|
|
* Link it onto the active snapshot list.
|
|
*/
|
|
if (is_active_snapshot(si, ip))
|
|
panic("ffs_snapshot_mount: %"PRIu64" already on list",
|
|
ip->i_number);
|
|
else
|
|
TAILQ_INSERT_TAIL(&si->si_snapshots, ip, i_nextsnap);
|
|
vp->v_vflag |= VV_SYSTEM;
|
|
VOP_UNLOCK(vp);
|
|
}
|
|
/*
|
|
* No usable snapshots found.
|
|
*/
|
|
if (vp == NULL) {
|
|
mutex_exit(&si->si_lock);
|
|
return;
|
|
}
|
|
/*
|
|
* Attach the block hints list. We always want to
|
|
* use the list from the newest snapshot.
|
|
*/
|
|
xp = TAILQ_LAST(&si->si_snapshots, inodelst);
|
|
si->si_snapblklist = xp->i_snapblklist;
|
|
fscow_establish(mp, ffs_copyonwrite, devvp);
|
|
si->si_gen++;
|
|
mutex_exit(&si->si_lock);
|
|
}
|
|
|
|
/*
|
|
* Disassociate snapshot files when unmounting.
|
|
*/
|
|
void
|
|
ffs_snapshot_unmount(struct mount *mp)
|
|
{
|
|
struct vnode *devvp = VFSTOUFS(mp)->um_devvp;
|
|
struct inode *xp;
|
|
struct vnode *vp = NULL;
|
|
struct snap_info *si;
|
|
|
|
si = VFSTOUFS(mp)->um_snapinfo;
|
|
mutex_enter(&si->si_lock);
|
|
while ((xp = TAILQ_FIRST(&si->si_snapshots)) != 0) {
|
|
vp = ITOV(xp);
|
|
TAILQ_REMOVE(&si->si_snapshots, xp, i_nextsnap);
|
|
if (xp->i_snapblklist == si->si_snapblklist)
|
|
si->si_snapblklist = NULL;
|
|
free(xp->i_snapblklist, M_UFSMNT);
|
|
if (xp->i_nlink > 0) {
|
|
si->si_gen++;
|
|
mutex_exit(&si->si_lock);
|
|
vrele(vp);
|
|
mutex_enter(&si->si_lock);
|
|
}
|
|
}
|
|
si->si_gen++;
|
|
mutex_exit(&si->si_lock);
|
|
if (vp)
|
|
fscow_disestablish(mp, ffs_copyonwrite, devvp);
|
|
}
|
|
|
|
/*
|
|
* Check for need to copy block that is about to be written,
|
|
* copying the block if necessary.
|
|
*/
|
|
static int
|
|
ffs_copyonwrite(void *v, struct buf *bp, bool data_valid)
|
|
{
|
|
struct fs *fs;
|
|
struct inode *ip;
|
|
struct vnode *devvp = v, *vp = NULL;
|
|
struct mount *mp = spec_node_getmountedfs(devvp);
|
|
struct snap_info *si;
|
|
void *saved_data = NULL;
|
|
daddr_t lbn, blkno, *snapblklist;
|
|
uint32_t gen;
|
|
int lower, upper, mid, snapshot_locked = 0, error = 0;
|
|
|
|
/*
|
|
* Check for valid snapshots.
|
|
*/
|
|
si = VFSTOUFS(mp)->um_snapinfo;
|
|
mutex_enter(&si->si_lock);
|
|
ip = TAILQ_FIRST(&si->si_snapshots);
|
|
if (ip == NULL) {
|
|
mutex_exit(&si->si_lock);
|
|
return 0;
|
|
}
|
|
/*
|
|
* First check to see if it is after the file system,
|
|
* in the journal or in the preallocated list.
|
|
* By doing these checks we avoid several potential deadlocks.
|
|
*/
|
|
fs = ip->i_fs;
|
|
lbn = ffs_fragstoblks(fs, FFS_DBTOFSB(fs, bp->b_blkno));
|
|
if (bp->b_blkno >= FFS_FSBTODB(fs, fs->fs_size)) {
|
|
mutex_exit(&si->si_lock);
|
|
return 0;
|
|
}
|
|
if ((fs->fs_flags & FS_DOWAPBL) &&
|
|
fs->fs_journal_location == UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM) {
|
|
off_t blk_off, log_start, log_end;
|
|
|
|
log_start = (off_t)fs->fs_journallocs[UFS_WAPBL_INFS_ADDR] *
|
|
fs->fs_journallocs[UFS_WAPBL_INFS_BLKSZ];
|
|
log_end = log_start + fs->fs_journallocs[UFS_WAPBL_INFS_COUNT] *
|
|
fs->fs_journallocs[UFS_WAPBL_INFS_BLKSZ];
|
|
blk_off = dbtob(bp->b_blkno);
|
|
if (blk_off >= log_start && blk_off < log_end) {
|
|
mutex_exit(&si->si_lock);
|
|
return 0;
|
|
}
|
|
}
|
|
snapblklist = si->si_snapblklist;
|
|
upper = (snapblklist != NULL ? snapblklist[0] - 1 : 0);
|
|
lower = 1;
|
|
while (lower <= upper) {
|
|
mid = (lower + upper) / 2;
|
|
if (snapblklist[mid] == lbn)
|
|
break;
|
|
if (snapblklist[mid] < lbn)
|
|
lower = mid + 1;
|
|
else
|
|
upper = mid - 1;
|
|
}
|
|
if (lower <= upper) {
|
|
mutex_exit(&si->si_lock);
|
|
return 0;
|
|
}
|
|
/*
|
|
* Not in the precomputed list, so check the snapshots.
|
|
*/
|
|
if (si->si_owner != curlwp) {
|
|
if (!mutex_tryenter(&si->si_snaplock)) {
|
|
mutex_exit(&si->si_lock);
|
|
mutex_enter(&si->si_snaplock);
|
|
mutex_enter(&si->si_lock);
|
|
}
|
|
si->si_owner = curlwp;
|
|
snapshot_locked = 1;
|
|
}
|
|
if (data_valid && bp->b_bcount == fs->fs_bsize)
|
|
saved_data = bp->b_data;
|
|
retry:
|
|
gen = si->si_gen;
|
|
TAILQ_FOREACH(ip, &si->si_snapshots, i_nextsnap) {
|
|
vp = ITOV(ip);
|
|
/*
|
|
* We ensure that everything of our own that needs to be
|
|
* copied will be done at the time that ffs_snapshot is
|
|
* called. Thus we can skip the check here which can
|
|
* deadlock in doing the lookup in ffs_balloc.
|
|
*/
|
|
if (bp->b_vp == vp)
|
|
continue;
|
|
/*
|
|
* Check to see if block needs to be copied.
|
|
*/
|
|
if (lbn < UFS_NDADDR) {
|
|
blkno = db_get(ip, lbn);
|
|
} else {
|
|
mutex_exit(&si->si_lock);
|
|
blkno = 0; /* XXX: GCC */
|
|
if ((error = snapblkaddr(vp, lbn, &blkno)) != 0) {
|
|
mutex_enter(&si->si_lock);
|
|
break;
|
|
}
|
|
mutex_enter(&si->si_lock);
|
|
if (gen != si->si_gen)
|
|
goto retry;
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if (blkno == BLK_SNAP && bp->b_lblkno >= 0)
|
|
panic("ffs_copyonwrite: bad copy block");
|
|
#endif
|
|
if (blkno != 0)
|
|
continue;
|
|
|
|
if (curlwp == uvm.pagedaemon_lwp) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
/* Only one level of recursion allowed. */
|
|
KASSERT(snapshot_locked);
|
|
/*
|
|
* Allocate the block into which to do the copy. Since
|
|
* multiple processes may all try to copy the same block,
|
|
* we have to recheck our need to do a copy if we sleep
|
|
* waiting for the lock.
|
|
*
|
|
* Because all snapshots on a filesystem share a single
|
|
* lock, we ensure that we will never be in competition
|
|
* with another process to allocate a block.
|
|
*/
|
|
#ifdef DEBUG
|
|
if (snapdebug) {
|
|
printf("Copyonwrite: snapino %llu lbn %" PRId64 " for ",
|
|
(unsigned long long)ip->i_number, lbn);
|
|
if (bp->b_vp == devvp)
|
|
printf("fs metadata");
|
|
else
|
|
printf("inum %llu", (unsigned long long)
|
|
VTOI(bp->b_vp)->i_number);
|
|
printf(" lblkno %" PRId64 "\n", bp->b_lblkno);
|
|
}
|
|
#endif
|
|
/*
|
|
* If we have already read the old block contents, then
|
|
* simply copy them to the new block. Note that we need
|
|
* to synchronously write snapshots that have not been
|
|
* unlinked, and hence will be visible after a crash,
|
|
* to ensure their integrity.
|
|
*/
|
|
mutex_exit(&si->si_lock);
|
|
if (saved_data == NULL) {
|
|
saved_data = malloc(fs->fs_bsize, M_UFSMNT, M_WAITOK);
|
|
error = rwfsblk(vp, B_READ, saved_data, lbn);
|
|
if (error) {
|
|
free(saved_data, M_UFSMNT);
|
|
saved_data = NULL;
|
|
mutex_enter(&si->si_lock);
|
|
break;
|
|
}
|
|
}
|
|
error = wrsnapblk(vp, saved_data, lbn);
|
|
if (error == 0 && ip->i_nlink > 0 && mp->mnt_wapbl)
|
|
error = syncsnap(vp);
|
|
mutex_enter(&si->si_lock);
|
|
if (error)
|
|
break;
|
|
if (gen != si->si_gen)
|
|
goto retry;
|
|
}
|
|
/*
|
|
* Note that we need to synchronously write snapshots that
|
|
* have not been unlinked, and hence will be visible after
|
|
* a crash, to ensure their integrity.
|
|
*/
|
|
if (snapshot_locked) {
|
|
si->si_owner = NULL;
|
|
mutex_exit(&si->si_lock);
|
|
mutex_exit(&si->si_snaplock);
|
|
} else
|
|
mutex_exit(&si->si_lock);
|
|
if (saved_data && saved_data != bp->b_data)
|
|
free(saved_data, M_UFSMNT);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Read from a snapshot.
|
|
*/
|
|
int
|
|
ffs_snapshot_read(struct vnode *vp, struct uio *uio, int ioflag)
|
|
{
|
|
struct inode *ip = VTOI(vp);
|
|
struct fs *fs = ip->i_fs;
|
|
struct snap_info *si = VFSTOUFS(vp->v_mount)->um_snapinfo;
|
|
struct buf *bp;
|
|
daddr_t lbn, nextlbn;
|
|
off_t fsbytes, bytesinfile;
|
|
long size, xfersize, blkoffset;
|
|
int error;
|
|
|
|
fstrans_start(vp->v_mount, FSTRANS_SHARED);
|
|
mutex_enter(&si->si_snaplock);
|
|
|
|
if (ioflag & IO_ALTSEMANTICS)
|
|
fsbytes = ip->i_size;
|
|
else
|
|
fsbytes = ffs_lfragtosize(fs, fs->fs_size);
|
|
for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
|
|
bytesinfile = fsbytes - uio->uio_offset;
|
|
if (bytesinfile <= 0)
|
|
break;
|
|
lbn = ffs_lblkno(fs, uio->uio_offset);
|
|
nextlbn = lbn + 1;
|
|
size = fs->fs_bsize;
|
|
blkoffset = ffs_blkoff(fs, uio->uio_offset);
|
|
xfersize = MIN(MIN(fs->fs_bsize - blkoffset, uio->uio_resid),
|
|
bytesinfile);
|
|
|
|
if (ffs_lblktosize(fs, nextlbn + 1) >= fsbytes) {
|
|
if (ffs_lblktosize(fs, lbn) + size > fsbytes)
|
|
size = ffs_fragroundup(fs,
|
|
fsbytes - ffs_lblktosize(fs, lbn));
|
|
error = bread(vp, lbn, size, NOCRED, 0, &bp);
|
|
} else {
|
|
int nextsize = fs->fs_bsize;
|
|
error = breadn(vp, lbn,
|
|
size, &nextlbn, &nextsize, 1, NOCRED, 0, &bp);
|
|
}
|
|
if (error)
|
|
break;
|
|
|
|
/*
|
|
* We should only get non-zero b_resid when an I/O error
|
|
* has occurred, which should cause us to break above.
|
|
* However, if the short read did not cause an error,
|
|
* then we want to ensure that we do not uiomove bad
|
|
* or uninitialized data.
|
|
*/
|
|
size -= bp->b_resid;
|
|
if (size < blkoffset + xfersize) {
|
|
xfersize = size - blkoffset;
|
|
if (xfersize <= 0)
|
|
break;
|
|
}
|
|
error = uiomove((char *)bp->b_data + blkoffset, xfersize, uio);
|
|
if (error)
|
|
break;
|
|
brelse(bp, BC_AGE);
|
|
}
|
|
if (bp != NULL)
|
|
brelse(bp, BC_AGE);
|
|
|
|
mutex_exit(&si->si_snaplock);
|
|
fstrans_done(vp->v_mount);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Lookup a snapshots data block address.
|
|
* Simpler than UFS_BALLOC() as we know all metadata is already allocated
|
|
* and safe even for the pagedaemon where we cannot bread().
|
|
*/
|
|
static int
|
|
snapblkaddr(struct vnode *vp, daddr_t lbn, daddr_t *res)
|
|
{
|
|
struct indir indirs[UFS_NIADDR + 2];
|
|
struct inode *ip = VTOI(vp);
|
|
struct fs *fs = ip->i_fs;
|
|
struct buf *bp;
|
|
int error, num;
|
|
|
|
KASSERT(lbn >= 0);
|
|
|
|
if (lbn < UFS_NDADDR) {
|
|
*res = db_get(ip, lbn);
|
|
return 0;
|
|
}
|
|
if ((error = ufs_getlbns(vp, lbn, indirs, &num)) != 0)
|
|
return error;
|
|
if (curlwp == uvm.pagedaemon_lwp) {
|
|
mutex_enter(&bufcache_lock);
|
|
bp = incore(vp, indirs[num-1].in_lbn);
|
|
if (bp && (bp->b_oflags & (BO_DONE | BO_DELWRI))) {
|
|
*res = idb_get(ip, bp->b_data, indirs[num-1].in_off);
|
|
error = 0;
|
|
} else
|
|
error = ENOMEM;
|
|
mutex_exit(&bufcache_lock);
|
|
return error;
|
|
}
|
|
error = bread(vp, indirs[num-1].in_lbn, fs->fs_bsize, NOCRED, 0, &bp);
|
|
if (error == 0) {
|
|
*res = idb_get(ip, bp->b_data, indirs[num-1].in_off);
|
|
brelse(bp, 0);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Read or write the specified block of the filesystem vp resides on
|
|
* from or to the disk bypassing the buffer cache.
|
|
*/
|
|
static int
|
|
rwfsblk(struct vnode *vp, int flags, void *data, daddr_t lbn)
|
|
{
|
|
int error;
|
|
struct inode *ip = VTOI(vp);
|
|
struct fs *fs = ip->i_fs;
|
|
struct buf *nbp;
|
|
|
|
nbp = getiobuf(NULL, true);
|
|
nbp->b_flags = flags;
|
|
nbp->b_bcount = nbp->b_bufsize = fs->fs_bsize;
|
|
nbp->b_error = 0;
|
|
nbp->b_data = data;
|
|
nbp->b_blkno = nbp->b_rawblkno = FFS_FSBTODB(fs, ffs_blkstofrags(fs, lbn));
|
|
nbp->b_proc = NULL;
|
|
nbp->b_dev = ip->i_devvp->v_rdev;
|
|
SET(nbp->b_cflags, BC_BUSY); /* mark buffer busy */
|
|
|
|
bdev_strategy(nbp);
|
|
|
|
error = biowait(nbp);
|
|
|
|
putiobuf(nbp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Write all dirty buffers to disk and invalidate them.
|
|
*/
|
|
static int
|
|
syncsnap(struct vnode *vp)
|
|
{
|
|
int error;
|
|
buf_t *bp;
|
|
struct fs *fs = VTOI(vp)->i_fs;
|
|
|
|
mutex_enter(&bufcache_lock);
|
|
while ((bp = LIST_FIRST(&vp->v_dirtyblkhd))) {
|
|
error = bbusy(bp, false, 0, NULL);
|
|
if (error == EPASSTHROUGH)
|
|
continue;
|
|
else if (error != 0) {
|
|
mutex_exit(&bufcache_lock);
|
|
return error;
|
|
}
|
|
KASSERT(bp->b_bcount == fs->fs_bsize);
|
|
mutex_exit(&bufcache_lock);
|
|
error = rwfsblk(vp, B_WRITE, bp->b_data,
|
|
ffs_fragstoblks(fs, FFS_DBTOFSB(fs, bp->b_blkno)));
|
|
brelse(bp, BC_INVAL | BC_VFLUSH);
|
|
if (error)
|
|
return error;
|
|
mutex_enter(&bufcache_lock);
|
|
}
|
|
mutex_exit(&bufcache_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write the specified block to a snapshot.
|
|
*/
|
|
static int
|
|
wrsnapblk(struct vnode *vp, void *data, daddr_t lbn)
|
|
{
|
|
struct inode *ip = VTOI(vp);
|
|
struct fs *fs = ip->i_fs;
|
|
struct buf *bp;
|
|
int error;
|
|
|
|
error = ffs_balloc(vp, ffs_lblktosize(fs, (off_t)lbn), fs->fs_bsize,
|
|
FSCRED, (ip->i_nlink > 0 ? B_SYNC : 0), &bp);
|
|
if (error)
|
|
return error;
|
|
memcpy(bp->b_data, data, fs->fs_bsize);
|
|
if (ip->i_nlink > 0)
|
|
error = bwrite(bp);
|
|
else
|
|
bawrite(bp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Check if this inode is present on the active snapshot list.
|
|
* Must be called with snapinfo locked.
|
|
*/
|
|
static inline bool
|
|
is_active_snapshot(struct snap_info *si, struct inode *ip)
|
|
{
|
|
struct inode *xp;
|
|
|
|
KASSERT(mutex_owned(&si->si_lock));
|
|
|
|
TAILQ_FOREACH(xp, &si->si_snapshots, i_nextsnap)
|
|
if (xp == ip)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Get/Put direct block from inode or buffer containing disk addresses. Take
|
|
* care for fs type (UFS1/UFS2) and byte swapping. These functions should go
|
|
* into a global include.
|
|
*/
|
|
static inline daddr_t
|
|
db_get(struct inode *ip, int loc)
|
|
{
|
|
if (ip->i_ump->um_fstype == UFS1)
|
|
return ufs_rw32(ip->i_ffs1_db[loc], UFS_IPNEEDSWAP(ip));
|
|
else
|
|
return ufs_rw64(ip->i_ffs2_db[loc], UFS_IPNEEDSWAP(ip));
|
|
}
|
|
|
|
static inline void
|
|
db_assign(struct inode *ip, int loc, daddr_t val)
|
|
{
|
|
if (ip->i_ump->um_fstype == UFS1)
|
|
ip->i_ffs1_db[loc] = ufs_rw32(val, UFS_IPNEEDSWAP(ip));
|
|
else
|
|
ip->i_ffs2_db[loc] = ufs_rw64(val, UFS_IPNEEDSWAP(ip));
|
|
}
|
|
|
|
static inline daddr_t
|
|
ib_get(struct inode *ip, int loc)
|
|
{
|
|
if (ip->i_ump->um_fstype == UFS1)
|
|
return ufs_rw32(ip->i_ffs1_ib[loc], UFS_IPNEEDSWAP(ip));
|
|
else
|
|
return ufs_rw64(ip->i_ffs2_ib[loc], UFS_IPNEEDSWAP(ip));
|
|
}
|
|
|
|
static inline daddr_t
|
|
idb_get(struct inode *ip, void *bf, int loc)
|
|
{
|
|
if (ip->i_ump->um_fstype == UFS1)
|
|
return ufs_rw32(((int32_t *)(bf))[loc], UFS_IPNEEDSWAP(ip));
|
|
else
|
|
return ufs_rw64(((int64_t *)(bf))[loc], UFS_IPNEEDSWAP(ip));
|
|
}
|
|
|
|
static inline void
|
|
idb_assign(struct inode *ip, void *bf, int loc, daddr_t val)
|
|
{
|
|
if (ip->i_ump->um_fstype == UFS1)
|
|
((int32_t *)(bf))[loc] = ufs_rw32(val, UFS_IPNEEDSWAP(ip));
|
|
else
|
|
((int64_t *)(bf))[loc] = ufs_rw64(val, UFS_IPNEEDSWAP(ip));
|
|
}
|