[stable request] ext4: fix fencepost in s_first_meta_bg validation

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Hi,

can we have:
commit 2ba3e6e8afc9b6188b471f27cf2b5e3cf34e7af2
Author: Theodore Ts'o <tytso@xxxxxxx>
Date:   Wed Feb 15 01:26:39 2017 -0500

    ext4: fix fencepost in s_first_meta_bg validation


in stable trees wherever 3a4b77cd47bb837b8557595ec7425f281f2ca1fe (ext4:
validate s_first_meta_bg at mount time) was applied? It fixes its
fallout as was reported by IBM to our bugzilla:
EXT4-fs (dm-0): mounting ext3 file system using the ext4 subsystem
EXT4-fs (dm-0): first meta block group too large: 1 (group descriptor
block count 1)
<8D>FAILED<D9> Failed to mount /sysroot/usr.

3.12 already has the patch as of 3.12.71.

thanks,
-- 
js
suse labs



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