Date: Tue, 2 Jul 2002 16:13:27 +0200 From: Johan Karlsson <johan@FreeBSD.ORG> To: Bruce Evans <bde@zeta.org.au> Cc: freebsd-audit@FreeBSD.ORG, sheldonh@FreeBSD.ORG Subject: Re: accounting to appen only file Message-ID: <20020702161327.A90890@numeri.campus.luth.se> In-Reply-To: <20020702224153.U12090-100000@gamplex.bde.org>; from bde@zeta.org.au on Tue, Jul 02, 2002 at 11:23:48PM %2B1000 References: <20020701204140.A49191@numeri.campus.luth.se> <20020702224153.U12090-100000@gamplex.bde.org>
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On Tue, Jul 02, 2002 at 23:23 (+1000) +0000, Bruce Evans wrote:
> Note that the flags variable was only used to discard some changes made
> by vn_open(). At least in the direct descendant of vn_open(), these changes
> are limited to clearing O_CREAT and O_TRUNC, but we really shouldn't assume
> this. Strictly, we should record returned flags for use late like the `file'
> layer would do.
I have implemented a variant of this, please see the attached patch.
take care
/Johan K
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Johan Karlsson mailto:johan@FreeBSD.org
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Index: kern_acct.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/kern_acct.c,v
retrieving revision 1.44
diff -u -r1.44 kern_acct.c
--- kern_acct.c 16 May 2002 21:28:11 -0000 1.44
+++ kern_acct.c 2 Jul 2002 14:04:12 -0000
@@ -83,10 +83,11 @@
static struct callout acctwatch_callout;
/*
- * Accounting vnode pointer, and saved vnode pointer.
+ * Accounting vnode pointer, saved vnode pointer, and its flags.
*/
static struct vnode *acctp;
static struct vnode *savacctp;
+static int acctflags, saveacctflags;
/*
* Values associated with enabling and disabling accounting
@@ -127,19 +128,19 @@
mtx_lock(&Giant);
/*
* If accounting is to be started to a file, open that file for
- * writing and make sure it's a 'normal'.
+ * appending and make sure it's a 'normal'.
*/
if (SCARG(uap, path) != NULL) {
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path),
td);
- flags = FWRITE;
+ flags = FWRITE | O_APPEND;
error = vn_open(&nd, &flags, 0);
if (error)
goto done2;
NDFREE(&nd, NDF_ONLY_PNBUF);
VOP_UNLOCK(nd.ni_vp, 0, td);
if (nd.ni_vp->v_type != VREG) {
- vn_close(nd.ni_vp, FWRITE, td->td_ucred, td);
+ vn_close(nd.ni_vp, flags, td->td_ucred, td);
error = EACCES;
goto done2;
}
@@ -151,7 +152,8 @@
*/
if (acctp != NULLVP || savacctp != NULLVP) {
callout_stop(&acctwatch_callout);
- error = vn_close((acctp != NULLVP ? acctp : savacctp), FWRITE,
+ error = vn_close((acctp != NULLVP ? acctp : savacctp),
+ (acctp != NULLVP ? acctflags : saveacctflags),
td->td_ucred, td);
acctp = savacctp = NULLVP;
}
@@ -163,6 +165,7 @@
* free space watcher.
*/
acctp = nd.ni_vp;
+ acctflags = flags;
callout_init(&acctwatch_callout, 0);
acctwatch(NULL);
done2:
@@ -316,13 +319,14 @@
if (savacctp != NULLVP) {
if (savacctp->v_type == VBAD) {
- (void) vn_close(savacctp, FWRITE, NOCRED, NULL);
+ (void) vn_close(savacctp, saveacctflags, NOCRED, NULL);
savacctp = NULLVP;
return;
}
(void)VFS_STATFS(savacctp->v_mount, &sb, (struct thread *)0);
if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
acctp = savacctp;
+ acctflags = savacctflags;
savacctp = NULLVP;
log(LOG_NOTICE, "Accounting resumed\n");
}
@@ -330,13 +334,14 @@
if (acctp == NULLVP)
return;
if (acctp->v_type == VBAD) {
- (void) vn_close(acctp, FWRITE, NOCRED, NULL);
+ (void) vn_close(acctp, acctflags, NOCRED, NULL);
acctp = NULLVP;
return;
}
(void)VFS_STATFS(acctp->v_mount, &sb, (struct thread *)0);
if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
savacctp = acctp;
+ savacctflags = acctflags;
acctp = NULLVP;
log(LOG_NOTICE, "Accounting suspended\n");
}
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