[Linux-cluster] problem exporting GFS2 filesystem with NFS

[Steven Whitehouse]

Hi,

On Wed, 2007-01-24 at 16:25 +0100, Benoit DUFFAU wrote:
> Le mercredi 24 janvier 2007 à 11:49 +0000, Steven Whitehouse a écrit :
> > > 
> > > are you sure with your code ?? :
> > > 
> > > +       if (unlock);
> > > +               gfs2_glock_dq_uninit(&gh);
> > > 
> > > shouldn't it be : 
> > > 
> > > +       if (unlock)
> > > +               gfs2_glock_dq_uninit(&gh);
> > > 
> > > instead ???
> > > 
> > Yes, you are right it should be. I don't know how that stray ; got in
> > there and I'll fix that now.
> > 
> 
> great ! 
> 
> > > 
> > > here again the kernel dump
> > > 
> > > Jan 24 12:27:55 replica1 kernel: ------------[ cut here ]------------
> > > Jan 24 12:27:55 replica1 kernel: Call Trace:
> > > 
> > The bit I really need to see is the next bit - i.e. the stack back
> > trace. Was it identical to the last trace you posted?
> > 
> 
> ok so here is the complete trace using your patch 
> 
> 
> Hope it helps
> 
Yes, that was just the thing, thanks for sending that. Please see if the
follow patch (it assumes that you have already applied the original fix
I pointed you at) does the trick,

Steve.


diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index f7c8d31..88fcfb4 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -395,8 +395,10 @@ struct inode *gfs2_lookup_simple(struct 
  * @is_root: If 1, ignore the caller's permissions
  * @i_gh: An uninitialized holder for the new inode glock
  *
- * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
- * @is_root is true.
+ * This can be called via the VFS filldir function when NFS is doing
+ * a readdirplus and the inode which its intending to stat isn't
+ * already in cache. In this case we must not take the directory glock
+ * again, since the readdir call will have already taken that lock.
  *
  * Returns: errno
  */
@@ -409,8 +411,9 @@ struct inode *gfs2_lookupi(struct inode 
 	struct gfs2_holder d_gh;
 	struct gfs2_inum_host inum;
 	unsigned int type;
-	int error = 0;
+	int error;
 	struct inode *inode = NULL;
+	int unlock = 0;
 
 	if (!name->len || name->len > GFS2_FNAMESIZE)
 		return ERR_PTR(-ENAMETOOLONG);
@@ -422,9 +425,12 @@ struct inode *gfs2_lookupi(struct inode 
 		return dir;
 	}
 
-	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
-	if (error)
-		return ERR_PTR(error);
+	if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) {
+		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
+		if (error)
+			return ERR_PTR(error);
+		unlock = 1;
+	}
 
 	if (!is_root) {
 		error = permission(dir, MAY_EXEC, NULL);
@@ -439,10 +445,11 @@ struct inode *gfs2_lookupi(struct inode 
 	inode = gfs2_inode_lookup(sb, &inum, type);
 
 out:
-	gfs2_glock_dq_uninit(&d_gh);
+	if (unlock)
+		gfs2_glock_dq_uninit(&d_gh);
 	if (error == -ENOENT)
 		return NULL;
-	return inode;
+	return inode ? inode : ERR_PTR(error);
 }
 
 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 4d7f94d..16bb4b4 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -69,13 +69,16 @@ static void buf_lo_add(struct gfs2_sbd *
 	struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 	struct gfs2_trans *tr;
 
-	if (!list_empty(&bd->bd_list_tr))
+	gfs2_log_lock(sdp);
+	if (!list_empty(&bd->bd_list_tr)) {
+		gfs2_log_unlock(sdp);
 		return;
-
+	}
 	tr = current->journal_info;
 	tr->tr_touched = 1;
 	tr->tr_num_buf++;
 	list_add(&bd->bd_list_tr, &tr->tr_list_buf);
+	gfs2_log_unlock(sdp);
 
 	if (!list_empty(&le->le_list))
 		return;
@@ -84,7 +87,6 @@ static void buf_lo_add(struct gfs2_sbd *
 
 	gfs2_meta_check(sdp, bd->bd_bh);
 	gfs2_pin(sdp, bd->bd_bh);
-
 	gfs2_log_lock(sdp);
 	sdp->sd_log_num_buf++;
 	list_add(&le->le_list, &sdp->sd_log_le_buf);
@@ -98,11 +100,13 @@ static void buf_lo_incore_commit(struct 
 	struct list_head *head = &tr->tr_list_buf;
 	struct gfs2_bufdata *bd;
 
+	gfs2_log_lock(sdp);
 	while (!list_empty(head)) {
 		bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
 		list_del_init(&bd->bd_list_tr);
 		tr->tr_num_buf--;
 	}
+	gfs2_log_unlock(sdp);
 	gfs2_assert_warn(sdp, !tr->tr_num_buf);
 }
 
@@ -462,13 +466,17 @@ static void databuf_lo_add(struct gfs2_s
 	struct address_space *mapping = bd->bd_bh->b_page->mapping;
 	struct gfs2_inode *ip = GFS2_I(mapping->host);
 
+	gfs2_log_lock(sdp);
 	tr->tr_touched = 1;
 	if (list_empty(&bd->bd_list_tr) &&
 	    (ip->i_di.di_flags & GFS2_DIF_JDATA)) {
 		tr->tr_num_buf++;
 		list_add(&bd->bd_list_tr, &tr->tr_list_buf);
+		gfs2_log_unlock(sdp);
 		gfs2_pin(sdp, bd->bd_bh);
 		tr->tr_num_buf_new++;
+	} else {
+		gfs2_log_unlock(sdp);
 	}
 	gfs2_trans_add_gl(bd->bd_gl);
 	gfs2_log_lock(sdp);
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 747c731..5591f89 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -1018,7 +1018,7 @@ static int gfs2_getattr(struct vfsmount 
 	}
 
 	generic_fillattr(inode, stat);
-	if (unlock);
+	if (unlock)
 		gfs2_glock_dq_uninit(&gh);
 
 	return 0;