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Keep a reference to the snapshot vnode until it gets removed from the 

snapshot list.
This commit is contained in:
hannken 2010-12-12 10:29:25 +00:00
parent f29d5492f8
commit 3b57b82b8f
1 changed files with 18 additions and 22 deletions
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40
sys/ufs/ffs/ffs_snapshot.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ffs_snapshot.c,v 1.100 2010/12/12 10:28:22 hannken Exp $ */
/* $NetBSD: ffs_snapshot.c,v 1.101 2010/12/12 10:29:25 hannken Exp $ */
/*
* Copyright 2000 Marshall Kirk McKusick. All Rights Reserved.
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_snapshot.c,v 1.100 2010/12/12 10:28:22 hannken Exp $");
__KERNEL_RCSID(0, "$NetBSD: ffs_snapshot.c,v 1.101 2010/12/12 10:29:25 hannken Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
@ -278,6 +278,7 @@ ffs_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ctime)
fs->fs_snapinum[snaploc] = ip->i_number;
mutex_enter(&si->si_lock);
vref(vp);
if (is_active_snapshot(si, ip))
panic("ffs_snapshot: %"PRIu64" already on list", ip->i_number);
TAILQ_INSERT_TAIL(&si->si_snapshots, ip, i_nextsnap);
@ -391,8 +392,7 @@ out:
(void) ffs_truncate(vp, (off_t)0, 0, NOCRED);
UFS_WAPBL_END(mp);
}
} else
vref(vp);
}
return (error);
}
@ -1269,10 +1269,8 @@ ffs_snapgone(struct inode *ip)
if (xp == ip)
break;
mutex_exit(&si->si_lock);
if (xp != NULL)
vrele(ITOV(ip));
#ifdef DEBUG
else if (snapdebug)
if (snapdebug && xp == NULL)
printf("ffs_snapgone: lost snapshot vnode %llu\n",
(unsigned long long)ip->i_number);
#endif
@ -1339,6 +1337,7 @@ ffs_snapremove(struct vnode *vp)
free(ip->i_snapblklist, M_UFSMNT);
ip->i_snapblklist = NULL;
}
vrele(vp);
} else
mutex_exit(&si->si_lock);
/*
@ -1713,28 +1712,25 @@ void
ffs_snapshot_unmount(struct mount *mp)
{
struct vnode *devvp = VFSTOUFS(mp)->um_devvp;
struct inode *xp;
struct vnode *vp = NULL;
struct inode *ip;
struct snap_info *si;
bool list_empty = true;
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)
while ((ip = TAILQ_FIRST(&si->si_snapshots)) != 0) {
list_empty = false;
TAILQ_REMOVE(&si->si_snapshots, ip, i_nextsnap);
if (ip->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);
}
free(ip->i_snapblklist, M_UFSMNT);
si->si_gen++;
mutex_exit(&si->si_lock);
vrele(ITOV(ip));
mutex_enter(&si->si_lock);
}
si->si_gen++;
mutex_exit(&si->si_lock);
if (vp)
if (! list_empty)
fscow_disestablish(mp, ffs_copyonwrite, devvp);
}