From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suzuki Subject: Problem with multiple mounts Date: Wed, 08 Nov 2006 11:22:15 -0800 Message-ID: <45522E67.7050907@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: reiserfs-list@namesys.com, lkml Cc: Jan Kara Hi, I am working on a problem as mentioned below : Problem description: "I exported a disk partition using nbd protocol. On the nbd client, I make reiserfs and run fsstress test case on this partition. At the same time, I mount this partition on the nbd server. Then Oops appears as following:" ReiserFS: sda10: found reiserfs format "3.6" with standard journal ReiserFS: sda10: using ordered data mode ReiserFS: sda10: journal params: device sda10, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 ReiserFS: sda10: checking transaction log (sda10) Oops: Kernel access of bad area, sig: 11 [#1] Call Trace: [C000000011333090] [C0000000001EDB70] .journal_read+0x165c/0x1b6c (unreliable) [C000000011333410] [C0000000001EF280] .journal_init+0xdc0/0xee8 [C000000011333530] [C0000000001CDBD8] .reiserfs_fill_super+0xa90/0x1e40 [C000000011333790] [C00000000011E988] .get_sb_bdev+0x208/0x31c [C000000011333870] [C0000000001CA00C] .get_super_block+0x38/0x60 [C000000011333900] [C00000000011E260] .vfs_kern_mount+0xec/0x198 [C0000000113339B0] [C00000000011E3E0] .do_kern_mount+0x88/0xdc [C000000011333A50] [C0000000001532CC] .do_mount+0xd50/0xe08 [C000000011333D60] [C000000000175090] .compat_sys_mount+0x368/0x448 [C000000011333E30] [C00000000000861C] syscall_exit+0x0/0x40 But, if we try the steps in the reverse order, "mount the partition on nbd server first and then try fsstress tests on the client side. This is just to ensure that the server is not seeing an incomplete journal created by the client side runs." Things work fine ! I doubt if this is due to the mount finding an incomplete journal created by the client side fsstress runs in the first scenario. My question is : Is this supported ? Mounting a filesystem which is already mounted and replaying the ( - a may be incomplete- ) journal. Thanks. Suzuki