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Date:	Tue, 04 Sep 2012 20:05:26 +0300
From:	Anssi Hannula <anssi.hannula@....fi>
To:	Theodore Ts'o <tytso@....edu>
CC:	Yongqiang Yang <xiaoqiangnk@...il.com>,
	Kevin Liao <kevinlia@...il.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/2] resize2fs: fix overhead calculation for meta_bg file
 systems

04.09.2012 05:14, Theodore Ts'o kirjoitti:
> On Tue, Sep 04, 2012 at 09:59:55AM +0800, Yongqiang Yang wrote:
>> Hi Kevin,
>>
>>   Ted has sent out the patches on online resizing for meta_bg and
>> 64bits, so you can have a try again. It seems that the bug in
>> e2fsprogs has been fixed.
> 
> Make sure you use the latest version of the kernel patches that I just
> sent out.  There quite a number of bugs in the Yongqiang's original
> patch set which I tripped over while I was testing 64-bit resize ---
> and please note that there are definitely still rough edges
> (especially for in cases where the file system was created < 16TB, but
> with the 64-bit feature and resize_inode features enabled).  There may
> also be bugs for the straightforward case of resizing very large file
> systems.

Indeed, I hit a BUG_ON() on resize from 8589934590 blocks to 8589934640
blocks (4k):
 [  676.140165] ------------[ cut here ]------------
 [  676.150026] kernel BUG at fs/ext4/resize.c:255!
 [  676.150026] invalid opcode: 0000 [#1] SMP
 [  676.150026] CPU 0
 [  676.150026] Modules linked in:[  676.150026]  dm_snapshot dm_zero
af_packet dm_mod joydev hid_generic ppdev snd_intel8x0 snd_ac97_codec
ac97_bus usbhid microcode e1000 snd_pcm snd_page_alloc snd_timer hid
i2c_piix4 i2c_core button snd soundcore ac parport_pc parport processor
evdev ipv6 autofs4 ext4 crc16 jbd2 ohci_hcd sd_mod crc_t10dif usbcore
usb_common sr_mod ata_piix ahci libahci libata scsi_mod [last unloaded:
nf_defrag_ipv4]

 [  676.150026] Pid: 1793, comm: resize2fs Not tainted
3.5.3-server-2anssi.9.ext4.10.2 #1 innotek GmbH VirtualBox
 [  676.150026] RIP: 0010:[<ffffffffa014e9bc>]  [<ffffffffa014e9bc>]
ext4_resize_fs+0x94c/0xa30 [ext4]
 [  676.150026] RSP: 0018:ffff880046eedd18  EFLAGS: 00010246
 [  676.150026] RAX: 0000000000040001 RBX: ffff88005b799800 RCX:
0000000000000001
 [  676.150026] RDX: 0000000000081bf1 RSI: 0000000000040001 RDI:
ffff88005b068000
 [  676.150026] RBP: ffff880046eeddd8 R08: 0000000200000003 R09:
0000000000000000
 [  676.150026] R10: 0000000000000000 R11: 0000000080042000 R12:
0000000000040001
 [  676.150026] R13: ffff880037fb5e20 R14: 0000000000000000 R15:
ffff88005b068000
 [  676.150026] FS:  00007fb43e067740(0000) GS:ffff88005fc00000(0000)
knlGS:0000000000000000
 [  676.150026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 [  676.150026] CR2: 00007fd905261178 CR3: 0000000044993000 CR4:
00000000000006f0
 [  676.150026] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
 [  676.150026] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
 [  676.150026] Process resize2fs (pid: 1793, threadinfo
ffff880046eec000, task ffff880053f824c0)
 [  676.150026] Stack:
 [  676.150026]  ffff880046eedda8 ffffffff8117971e 0000000f53529c40
0000000000000000
 [  676.150026]  000000020000002f 0000000000000000 0000000200000030
ffff88005b20e990
 [  676.150026]  0000000100000001 ffff880000000001 0000000200000000
0000000200000000
 [  676.150026] Call Trace:
 [  676.150026]  [<ffffffff8117971e>] ? do_last+0x2ee/0x9f0
 [  676.150026]  [<ffffffffa012e05f>] ext4_ioctl+0x9af/0xbc0 [ext4]
 [  676.150026]  [<ffffffff8117db6f>] do_vfs_ioctl+0x8f/0x4e0
 [  676.150026]  [<ffffffff8117e051>] sys_ioctl+0x91/0xa0
 [  676.150026]  [<ffffffff8147d0bd>] system_call_fastpath+0x1a/0x1f
 [  676.150026] Code: c7 c1 60 2c 17 a0 ba 0c 07 00 00 48 c7 c6 9b e8 16
a0 4c 89 e7 31 c0 e8 b3 80 ff ff c7 85 6c ff ff ff ea ff ff ff e9 4c f8
ff ff <0f> 0b 8b 55 a4 8b 45 a0 f7 da 44 31 e0 85 c2 0f 84 6c fb ff ff
 [  676.150026] RIP  [<ffffffffa014e9bc>] ext4_resize_fs+0x94c/0xa30 [ext4]
 [  676.150026]  RSP <ffff880046eedd18>
 [  676.788513] ---[ end trace fbf2bd5a59c2ab99 ]---

This is BUG_ON(src_group >= group_data[0].group + flex_gd->count);

I was using the below basic test script which uses a virtual large
volume in LVM (e2fsprogs is 1.42.5, except for resize2fs):

#!/bin/bash -ex

VG=delta
LV=ext4test
LVSIZE=40T
MOUNTPOINT="/mnt/iso"
RESIZE2FS=/root/resize2fs

INITIAL_SIZE_K=4294967295
NEW_BLOCKS=8589934590

lvcreate -l 100%FREE -V "$LVSIZE" -n "$LV" "$VG"
mkfs.ext4 -O meta_bg,64bit,^resize_inode "/dev/$VG/$LV" "$INITIAL_SIZE_K"

mount "/dev/$VG/$LV" "$MOUNTPOINT"

mkdir "$MOUNTPOINT/test"
for file in 1 2; do
        dd if=/dev/urandom bs=1M count=50 of="$MOUNTPOINT/test/$file"
done
md5sum $MOUNTPOINT/test/* > $MOUNTPOINT/MD5SUM

for N in $NEW_BLOCKS $((NEW_BLOCKS + 50)); do
        $RESIZE2FS "/dev/$VG/$LV" "$N"

        umount "$MOUNTPOINT"
        fsck.ext4 -nvf "/dev/$VG/$LV"
        mount "/dev/$VG/$LV" "$MOUNTPOINT"
        md5sum -c "$MOUNTPOINT/MD5SUM"
done



> So while I very much appreciate users giving the code a try and
> sending us feedback, please do think twice before using this code on
> file systems with data that hasn't been backed up recently.  (Of
> course, being good System Administrators you are all keeping --- and
> verifying --- regular backups, right?  :-)

-- 
Anssi Hannula
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