From: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Date: Tue, 27 Jul 2010 15:56:07 +0000 (-0400)
Subject: ext4: fix EFBIG edge case when writing to large non-extent file
X-Git-Tag: v2.6.36-rc1~501^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d889dc8382c4d71b6d538b7b13777bc1ec51df10;p=pandora-kernel.git

ext4: fix EFBIG edge case when writing to large non-extent file

By running the following reproducer, we can confirm that the write
system call returns with 0 when it should return the error EFBIG.

#!/bin/sh

/bin/dd if=/dev/zero of=./img bs=1k count=1 seek=1024k > /dev/null 2>&1
/sbin/mkfs.ext3 -Fq ./img
/bin/mount -o loop -t ext4 ./img /mnt
/bin/touch /mnt/file
strace /bin/dd if=/dev/zero of=/mnt/file conv=notrunc bs=1k count=1 seek=$((2194719883264/1024)) 2>&1 | /bin/egrep "write.* 1024\) = "
/bin/umount /mnt
exit

Signed-off-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Eric Sandeen <sandeen@redhat.com>
---

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