xfs: fix memory allocation failures with ACLs

Ever since increasing the number of supported ACLs from 25 to as
many as can fit in an xattr, there have been reports of order 4
memory allocations failing in the ACL code. Fix it in the same way
we've fixed all the xattr read/write code that has the same problem.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_acl.c

@@ -152,9 +152,12 @@ xfs_get_acl(struct inode *inode, int type)
 	 * go out to the disk.
 	 */
 	len = XFS_ACL_MAX_SIZE(ip->i_mount);
-	xfs_acl = kzalloc(len, GFP_KERNEL);
-	if (!xfs_acl)
-		return ERR_PTR(-ENOMEM);
+	xfs_acl = kmem_zalloc(len, KM_SLEEP | KM_MAYFAIL);
+	if (!xfs_acl) {
+		xfs_acl = kmem_zalloc_large(len);
+		if (!xfs_acl)
+			return ERR_PTR(-ENOMEM);
+	}
 
 	error = -xfs_attr_get(ip, ea_name, (unsigned char *)xfs_acl,
 							&len, ATTR_ROOT);
@@ -175,10 +178,13 @@ xfs_get_acl(struct inode *inode, int type)
 	if (IS_ERR(acl))
 		goto out;
 
- out_update_cache:
+out_update_cache:
 	set_cached_acl(inode, type, acl);
- out:
-	kfree(xfs_acl);
+out:
+	if (is_vmalloc_addr(xfs_acl))
+		kmem_free_large(xfs_acl);
+	else
+		kfree(xfs_acl);
 	return acl;
 }
 
@@ -209,9 +215,12 @@ xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
 		struct xfs_acl *xfs_acl;
 		int len = XFS_ACL_MAX_SIZE(ip->i_mount);
 
-		xfs_acl = kzalloc(len, GFP_KERNEL);
-		if (!xfs_acl)
-			return -ENOMEM;
+		xfs_acl = kmem_zalloc(len, KM_SLEEP | KM_MAYFAIL);
+		if (!xfs_acl) {
+			xfs_acl = kmem_zalloc_large(len);
+			if (!xfs_acl)
+				return -ENOMEM;
+		}
 
 		xfs_acl_to_disk(xfs_acl, acl);
 
@@ -222,7 +231,10 @@ xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
 		error = -xfs_attr_set(ip, ea_name, (unsigned char *)xfs_acl,
 				len, ATTR_ROOT);
 
-		kfree(xfs_acl);
+		if (is_vmalloc_addr(xfs_acl))
+			kmem_free_large(xfs_acl);
+		else
+			kfree(xfs_acl);
 	} else {
 		/*
 		 * A NULL ACL argument means we want to remove the ACL.