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I believe that the following fix to nfs_vnops.c should do the trick w.r.t.

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the problem "when a file is truncated on the server after being written on
a client under NFSv3, the client doesn't see the size drop to zero".
(As you noted, the problem is that NMODIFIED wasn't being cleared by nfs_close
 when it flushed the buffers. After checking through the code, the only place
 where NMODIFIED was used to test for the possibility of dirty blocks was in
 nfs_setattr(). The two cases are safe to do when there aren't dirty blocks,
 so I just took out the tests. Unfortunately, testing for
 v_dirtyblkhd.lh_first being non-null is not sufficient, since there are
 times when the code moves blocks to the clean list and then back to the
 dirty list.)

Submitted by:	rick@snowhite.cis.uoguelph.ca
This commit is contained in:
Doug Rabson 1995-07-13 17:55:12 +00:00
parent d3ebcaeb6b
commit 5d81e553a2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9522
2 changed files with 16 additions and 20 deletions
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18
sys/nfs/nfs_vnops.c
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* @(#)nfs_vnops.c 8.5 (Berkeley) 2/13/94
* $Id: nfs_vnops.c,v 1.18 1995/06/28 17:33:39 dfr Exp $
* $Id: nfs_vnops.c,v 1.19 1995/07/13 08:47:55 davidg Exp $
*/
/*
@ -506,9 +506,10 @@ nfs_close(ap)
if (vp->v_type == VREG) {
if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 &&
(np->n_flag & NMODIFIED)) {
if (NFS_ISV3(vp))
if (NFS_ISV3(vp)) {
error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_p, 0);
else
np->n_flag &= ~NMODIFIED;
} else
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 1);
np->n_attrstamp = 0;
}
@ -599,22 +600,20 @@ nfs_setattr(ap)
vap->va_size = VNOVAL;
break;
default:
if (np->n_flag & NMODIFIED) {
if (vap->va_size == 0)
if (vap->va_size == 0)
error = nfs_vinvalbuf(vp, 0,
ap->a_cred, ap->a_p, 1);
else
else
error = nfs_vinvalbuf(vp, V_SAVE,
ap->a_cred, ap->a_p, 1);
if (error)
if (error)
return (error);
}
tsize = np->n_size;
np->n_size = np->n_vattr.va_size = vap->va_size;
vnode_pager_setsize(vp, (u_long)np->n_size);
};
} else if ((vap->va_mtime.ts_sec != VNOVAL ||
vap->va_atime.ts_sec != VNOVAL) && (np->n_flag & NMODIFIED) &&
vap->va_atime.ts_sec != VNOVAL) &&
vp->v_type == VREG &&
(error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
ap->a_p, 1)) == EINTR)
@ -2878,7 +2877,6 @@ loop:
error = np->n_error;
np->n_flag &= ~NWRITEERR;
}
np->n_flag &= ~NMODIFIED;
return (error);
}

18
sys/nfsclient/nfs_vnops.c
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* @(#)nfs_vnops.c 8.5 (Berkeley) 2/13/94
* $Id: nfs_vnops.c,v 1.18 1995/06/28 17:33:39 dfr Exp $
* $Id: nfs_vnops.c,v 1.19 1995/07/13 08:47:55 davidg Exp $
*/
/*
@ -506,9 +506,10 @@ nfs_close(ap)
if (vp->v_type == VREG) {
if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 &&
(np->n_flag & NMODIFIED)) {
if (NFS_ISV3(vp))
if (NFS_ISV3(vp)) {
error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_p, 0);
else
np->n_flag &= ~NMODIFIED;
} else
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 1);
np->n_attrstamp = 0;
}
@ -599,22 +600,20 @@ nfs_setattr(ap)
vap->va_size = VNOVAL;
break;
default:
if (np->n_flag & NMODIFIED) {
if (vap->va_size == 0)
if (vap->va_size == 0)
error = nfs_vinvalbuf(vp, 0,
ap->a_cred, ap->a_p, 1);
else
else
error = nfs_vinvalbuf(vp, V_SAVE,
ap->a_cred, ap->a_p, 1);
if (error)
if (error)
return (error);
}
tsize = np->n_size;
np->n_size = np->n_vattr.va_size = vap->va_size;
vnode_pager_setsize(vp, (u_long)np->n_size);
};
} else if ((vap->va_mtime.ts_sec != VNOVAL ||
vap->va_atime.ts_sec != VNOVAL) && (np->n_flag & NMODIFIED) &&
vap->va_atime.ts_sec != VNOVAL) &&
vp->v_type == VREG &&
(error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
ap->a_p, 1)) == EINTR)
@ -2878,7 +2877,6 @@ loop:
error = np->n_error;
np->n_flag &= ~NWRITEERR;
}
np->n_flag &= ~NMODIFIED;
return (error);
}