linux-ext4 - ext4_validate_block_bitmap regression on ext3 with stride=X

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Date:   Thu, 19 Apr 2018 20:50:43 +0200
From:   Ilya Dryomov <idryomov@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     "Theodore Ts'o" <tytso@....edu>
Subject: ext4_validate_block_bitmap regression on ext3 with stride=X

Hello,

Commit 7dac4a1726a9 ("ext4: add validity checks for bitmap block
numbers") in 4.17-rc1 causes a regression on ext3 with a custom
stride-size.  One of the new checks triggers, sometimes leading to
transient -ENOSPC errors that go away after a remount.

Trivially reproduced with:

  $ mkfs -t ext3 -E stride=256 /dev/vdb
  $ mount /dev/vdb /mnt
  $ cd /mnt
  $ wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.16.3.tar.xz
  $ tar xvf linux-4.16.3.tar.xz

[ 2769.383365] EXT4-fs (vdb): mounting ext3 file system using the ext4 subsystem
[ 2769.392635] EXT4-fs (vdb): mounted filesystem with ordered data
mode. Opts: (null)
[ 2791.127834] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 14: block 462848: invalid
block bitmap
[ 2791.130456] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 15: block 495872: invalid
block bitmap
[ 2791.133257] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 16: block 528896: invalid
block bitmap
[ 2791.137147] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 17: block 561920: invalid
block bitmap
[ 2791.139943] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 18: block 594944: invalid
block bitmap
[ 2791.142342] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 20: block 660992: invalid
block bitmap
[ 2791.145348] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 21: block 694016: invalid
block bitmap
[ 2791.148161] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 22: block 727040: invalid
block bitmap
[ 2791.150702] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 23: block 760064: invalid
block bitmap
[ 2791.153333] EXT4-fs error (device vdb):
ext4_validate_block_bitmap:399: comm tar: bg 24: block 793088: invalid
block bitmap

Reverting 7dac4a1726a9 fixes it for me.

Thanks,

                Ilya