linux-ext4 - [PATCH 00/18] e2fsprogs patchbomb 7/14, part 2

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Date:	Fri, 25 Jul 2014 17:33:39 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 00/18] e2fsprogs patchbomb 7/14, part 2

Hi all,

Continuing the patchset that I sent last Friday, here are patches to
fix e2fsck failures with filesystems containing the bigalloc and/or
metadata checksumming features.  Like last week, e2fuzz helped me to
find the failures.

The first patch is the 'reserve & repair root' patch from last week,
unchanged from last week but included so it doesn't get lost in the
noise.  The second patch fixes a merge error in -next.

Patches 3 & 5 fix some fairly common errors when allocating or
deallocating blocks within a cluster.  Perhaps the most controversial
bigalloc patch is #4, which uses the duplicate block handler to
enforce that a logical cluster only maps to a single physical cluster,
and that within a cluster, each logical block maps to the same block
within the physical cluster.

Patches 6-10 are largely unchanged from patches 10-14 in the 5/14
patchbomb, though they include suggestions that Lukáš had at that
time.  These patches largely alter e2fsck's behavior regarding
checksums -- allowing the user to specify strict mode (zap anything
with a bad checksum) or regular mode (fix checksum if it passes other
tests), and corrects some mis-handling by other parts of fsck.

Patches 11-18 also fix errors when dealing with FS objects that fail
checksum tests.  Library flag handling, error reporting, inode
re-checking (for regular mode), directory repair, and extent checksum
repair all required minor corrections.

I've tested these e2fsprogs changes against the -next branch as of
7/25.  As I stated in the part 1 introduction, I use several VMs, each
with 32M-1G ramdisks to test with; the test process is "misc/e2fuzz.sh
-B <fuzz> -s <size>", where fuzz is anything from 2 bytes to "0.1%"
of metadata bytes.  Since the bulk of changes to -next in the past 12
days are my own patches, I've only run the `make check' tests and run
e2fuzz a few thousand times to quick-check for errors.

Next week will be e2fsck fixes for extended attribute and inline data
problems.

Comments and questions are, as always, welcome.

--D
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