Date: Fri, 16 Nov 2001 14:56:59 +0300 (MSK) From: Maxim Konovalov <maxim@macomnet.ru> To: Alfred Perlstein <bright@mu.org> Cc: John Baldwin <jhb@FreeBSD.org>, <hackers@FreeBSD.org> Subject: Re: has 'options LOCKF_DEBUG' ever worked? (w/ patch) (fwd) Message-ID: <20011116113214.S13973-100000@news1.macomnet.ru> In-Reply-To: <20011115153239.T13393@elvis.mu.org>
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Hello,
On Thu, 15 Nov 2001, Alfred Perlstein wrote:
> Yes I saw this, I have no idea what 'JH' stands for either that's why
> I left it as is.
>
> The problem is that VTOI is ufs specific, this "fix" will break
> LOCKF_DEBUG for all other FS's other than UFS because it casts
> the vnode->data ptr to struct inode *.
>
> So your "fix" is broken.
Alfred, John, thanks you very much for your answers. I expected
something similar. Btw are there any smart ways to find out does
underlying FS support inode concept or not? Yes, I know about
vnode.v_tag, but comparing it with VT_UFS/VT_NFS/VT_MFS etc does not
look OK for me.
> Please just fix lf_print to not deref the inode ptr in the struct.
Here it is. I put you comment, Alfred, above lf_inode assignment.
Index: kern_lockf.c
===================================================================
RCS file: /vol0/cvs/ncvs/src/sys/kern/kern_lockf.c,v
retrieving revision 1.38
diff -u -r1.38 kern_lockf.c
--- kern_lockf.c 2001/09/12 08:37:44 1.38
+++ kern_lockf.c 2001/11/16 11:49:42
@@ -163,7 +163,13 @@
lock->lf_start = start;
lock->lf_end = end;
lock->lf_id = ap->a_id;
-/* lock->lf_inode = ip; */ /* XXX JH */
+ /*
+ * XXX The problem is that VTOI is ufs specific, so it will
+ * break LOCKF_DEBUG for all other FS's other than UFS because
+ * it casts the vnode->data ptr to struct inode *.
+ */
+/* lock->lf_inode = VTOI(ap->a_vp); */
+ lock->lf_inode = (struct inode *)0;
lock->lf_type = fl->l_type;
lock->lf_head = head;
lock->lf_next = (struct lockf *)0;
@@ -768,15 +774,22 @@
printf("proc %ld", (long)((struct proc *)lock->lf_id)->p_pid);
else
printf("id %p", (void *)lock->lf_id);
- /* XXX no %qd in kernel. Truncate. */
- printf(" in ino %lu on dev <%d, %d>, %s, start %ld, end %ld",
- (u_long)lock->lf_inode->i_number,
- major(lock->lf_inode->i_dev),
- minor(lock->lf_inode->i_dev),
- lock->lf_type == F_RDLCK ? "shared" :
- lock->lf_type == F_WRLCK ? "exclusive" :
- lock->lf_type == F_UNLCK ? "unlock" :
- "unknown", (long)lock->lf_start, (long)lock->lf_end);
+ if (lock->lf_inode != (struct inode *)0)
+ /* XXX no %qd in kernel. Truncate. */
+ printf(" in ino %lu on dev <%d, %d>, %s, start %ld, end %ld",
+ (u_long)lock->lf_inode->i_number,
+ major(lock->lf_inode->i_dev),
+ minor(lock->lf_inode->i_dev),
+ lock->lf_type == F_RDLCK ? "shared" :
+ lock->lf_type == F_WRLCK ? "exclusive" :
+ lock->lf_type == F_UNLCK ? "unlock" :
+ "unknown", (long)lock->lf_start, (long)lock->lf_end);
+ else
+ printf(" %s, start %ld, end %ld",
+ lock->lf_type == F_RDLCK ? "shared" :
+ lock->lf_type == F_WRLCK ? "exclusive" :
+ lock->lf_type == F_UNLCK ? "unlock" :
+ "unknown", (long)lock->lf_start, (long)lock->lf_end);
if (!TAILQ_EMPTY(&lock->lf_blkhd))
printf(" block %p\n", (void *)TAILQ_FIRST(&lock->lf_blkhd));
else
@@ -789,6 +802,9 @@
struct lockf *lock;
{
register struct lockf *lf, *blk;
+
+ if (lock->lf_inode == (struct inode *)0)
+ return;
printf("%s: Lock list for ino %lu on dev <%d, %d>:\n",
tag, (u_long)lock->lf_inode->i_number,
> -Alfred
tested on -stable.
- -maxim
--
Maxim Konovalov, MAcomnet, Internet-Intranet Dept., system engineer
phone: +7 (095) 796-9079, mailto: maxim@macomnet.ru
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