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Message-ID: <20130128173647.GA23868@gmail.com> Date: Tue, 29 Jan 2013 01:36:47 +0800 From: Zheng Liu <gnehzuil.liu@...il.com> To: linux-ext4@...r.kernel.org Subject: punch command works incorrect in debugfs Hi all, I found a bug in debugfs that 'punch' command work incorrect for a indirect-based file. The bug can be triggered by the following commands, and it seems that the problem is in libext2fs library. I file this bug in mailing list because I have no time to look at it carefully and I doubt that this command is not used frequently. [reproduce steps] sudo mkfs.ext4 -O ^extent ${DEV} sudo mount -t ext4 ${DEV} ${MNT} sudo dd if=/dev/zero of=${MNT}/punch-file bs=4k count=16 sync sudo umount ${MNT} sudo debugfs ${DEV} -R 'stat punch-file' sudo debugfs -w ${DEV} -R 'punch punch-file 4 6' sudo debugfs ${DEV} -R 'stat punch-file' [expected result] ... BLOCKS: (0-3):34304-34307, (6-11):34310-34315, (IND):33793, (12-15):34316-34319 ... [wrong result] ... BLOCKS: (0-11):34304-34315, (IND):33793, (12-15):34316-34319 ... Regards, - Zheng -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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