Message-ID: <20140311065643.30585.824.stgit@birch.djwong.org>
Date:	Mon, 10 Mar 2014 23:56:43 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 26/49] tests: add test for corrupted checksummed root
 directory block

fsck crashes if we take a checksummed filesystem, zap the root
directory block, and try to fix things.

If we trash the root directory block, e2fsck will find inode 11 (the
old lost+found) and try to attach it to l+f.  The lost+found checker
also fails to find l+f and tries to add one to the root dir.  The root
dir is not found but is recreated with incorrect checksums, so linking
in the l+f dir fails and the l+f '..' entry isn't set.  Since both
dirs now fail checksum verification, they're both referred to rehash
to have that fixed, but because l+f doesn't have a '..' entry, rehash
crashes because l+f has < 2 entries.

On a checksumming filesystem, the routines in e2fsck that recreate
/lost+found and / must write the new directory block *after* the inode
has been written to disk because the checksum depends on i_generation.
This will have been fixed in the previous patch, so add a regression
test.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 tests/f_rebuild_csum_rootdir/expect.1 |  311 +++++++++++++++++++++++++++++++++
 tests/f_rebuild_csum_rootdir/expect.2 |    7 +
 tests/f_rebuild_csum_rootdir/image.gz |  Bin
 tests/f_rebuild_csum_rootdir/name     |    1 
 4 files changed, 319 insertions(+)
 create mode 100644 tests/f_rebuild_csum_rootdir/expect.1
 create mode 100644 tests/f_rebuild_csum_rootdir/expect.2
 create mode 100644 tests/f_rebuild_csum_rootdir/image.gz
 create mode 100644 tests/f_rebuild_csum_rootdir/name


diff --git a/tests/f_rebuild_csum_rootdir/expect.1 b/tests/f_rebuild_csum_rootdir/expect.1
new file mode 100644
index 0000000..6b5c47b
--- /dev/null
+++ b/tests/f_rebuild_csum_rootdir/expect.1
@@ -0,0 +1,311 @@
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Directory inode 2, block #0, offset 0: directory has no checksum
+Fix? yes
+
+Directory inode 2, block #0, offset 0: directory corrupted
+Salvage? yes
+
+Missing '.' in directory inode 2.
+Fix? yes
+
+Setting filetype for entry '.' in ??? (2) to 2.
+Missing '..' in directory inode 2.
+Fix? yes
+
+Setting filetype for entry '..' in ??? (2) to 2.
+Pass 3: Checking directory connectivity
+'..' in / (2) is <The NULL inode> (0), should be / (2).
+Fix? yes
+
+Unconnected directory inode 11 (/???)
+Connect to /lost+found? yes
+
+/lost+found not found.  Create? yes
+
+Pass 3A: Optimizing directories
+Pass 4: Checking reference counts
+Inode 11 ref count is 3, should be 2.  Fix? yes
+
+Unattached inode 12
+Connect to /lost+found? yes
+
+Inode 12 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 13
+Connect to /lost+found? yes
+
+Inode 13 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 14
+Connect to /lost+found? yes
+
+Inode 14 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 15
+Connect to /lost+found? yes
+
+Inode 15 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 16
+Connect to /lost+found? yes
+
+Inode 16 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 17
+Connect to /lost+found? yes
+
+Inode 17 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 18
+Connect to /lost+found? yes
+
+Inode 18 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 19
+Connect to /lost+found? yes
+
+Inode 19 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 20
+Connect to /lost+found? yes
+
+Inode 20 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 21
+Connect to /lost+found? yes
+
+Inode 21 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 22
+Connect to /lost+found? yes
+
+Inode 22 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 23
+Connect to /lost+found? yes
+
+Inode 23 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 24
+Connect to /lost+found? yes
+
+Inode 24 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 25
+Connect to /lost+found? yes
+
+Inode 25 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 26
+Connect to /lost+found? yes
+
+Inode 26 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 27
+Connect to /lost+found? yes
+
+Inode 27 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 28
+Connect to /lost+found? yes
+
+Inode 28 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 29
+Connect to /lost+found? yes
+
+Inode 29 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 30
+Connect to /lost+found? yes
+
+Inode 30 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 31
+Connect to /lost+found? yes
+
+Inode 31 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 32
+Connect to /lost+found? yes
+
+Inode 32 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 33
+Connect to /lost+found? yes
+
+Inode 33 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 34
+Connect to /lost+found? yes
+
+Inode 34 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 35
+Connect to /lost+found? yes
+
+Inode 35 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 36
+Connect to /lost+found? yes
+
+Inode 36 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 37
+Connect to /lost+found? yes
+
+Inode 37 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 38
+Connect to /lost+found? yes
+
+Inode 38 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 39
+Connect to /lost+found? yes
+
+Inode 39 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 40
+Connect to /lost+found? yes
+
+Inode 40 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 41
+Connect to /lost+found? yes
+
+Inode 41 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 42
+Connect to /lost+found? yes
+
+Inode 42 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 43
+Connect to /lost+found? yes
+
+Inode 43 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 44
+Connect to /lost+found? yes
+
+Inode 44 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 45
+Connect to /lost+found? yes
+
+Inode 45 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 46
+Connect to /lost+found? yes
+
+Inode 46 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 47
+Connect to /lost+found? yes
+
+Inode 47 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 48
+Connect to /lost+found? yes
+
+Inode 48 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 49
+Connect to /lost+found? yes
+
+Inode 49 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 50
+Connect to /lost+found? yes
+
+Inode 50 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 51
+Connect to /lost+found? yes
+
+Inode 51 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 52
+Connect to /lost+found? yes
+
+Inode 52 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 53
+Connect to /lost+found? yes
+
+Inode 53 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 54
+Connect to /lost+found? yes
+
+Inode 54 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 55
+Connect to /lost+found? yes
+
+Inode 55 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 56
+Connect to /lost+found? yes
+
+Inode 56 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 57
+Connect to /lost+found? yes
+
+Inode 57 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 58
+Connect to /lost+found? yes
+
+Inode 58 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 59
+Connect to /lost+found? yes
+
+Inode 59 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 60
+Connect to /lost+found? yes
+
+Inode 60 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 61
+Connect to /lost+found? yes
+
+Inode 61 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 62
+Connect to /lost+found? yes
+
+Inode 62 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 63
+Connect to /lost+found? yes
+
+Inode 63 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 64
+Connect to /lost+found? yes
+
+Inode 64 ref count is 2, should be 1.  Fix? yes
+
+Unattached zero-length inode 65.  Clear? yes
+
+Unattached inode 66
+Connect to /lost+found? yes
+
+Inode 66 ref count is 2, should be 1.  Fix? yes
+
+Unattached inode 67
+Connect to /lost+found? yes
+
+Inode 67 ref count is 2, should be 1.  Fix? yes
+
+Pass 5: Checking group summary information
+
+test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
+test_filesys: 67/512 files (1.5% non-contiguous), 1127/2048 blocks
+Exit status is 1
diff --git a/tests/f_rebuild_csum_rootdir/expect.2 b/tests/f_rebuild_csum_rootdir/expect.2
new file mode 100644
index 0000000..033f1bf
--- /dev/null
+++ b/tests/f_rebuild_csum_rootdir/expect.2
@@ -0,0 +1,7 @@
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+test_filesys: 67/512 files (1.5% non-contiguous), 1127/2048 blocks
+Exit status is 0
diff --git a/tests/f_rebuild_csum_rootdir/image.gz b/tests/f_rebuild_csum_rootdir/image.gz
new file mode 100644
index 0000000000000000000000000000000000000000..a32fd4431a44560b20033d43836000ef22ce977f
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z#E5r=8v4^nO`wW3d9fZ*A1NTJ7Wq=bn?=x*NQrZlNZwy&pn8w^{xpas7eRuz5^4V*
zD!SGgR_bD~gRXXV%Q$Md39@...WoTr3>wYe^agZd_AOW{_t&`7zM1rt>GGO1AlYT+
zDsFVRf^wy+ySAnszIBG(%^J}2F)3pFJA$koqa~mvpe3Lspe3Lspe3Lspe3Lspe3Ls
zpe3Lspe3Lspe3Lspe3Lspe3Lspe3Lspe3Lspe67(B|wQB?3U1P9P7+eL4^IM3;(9e
W)Gq69OyI|Sozg9bf2Chr*ZB{=uW}{;

literal 0
HcmV?d00001

diff --git a/tests/f_rebuild_csum_rootdir/name b/tests/f_rebuild_csum_rootdir/name
new file mode 100644
index 0000000..b246f48
--- /dev/null
+++ b/tests/f_rebuild_csum_rootdir/name
@@ -0,0 +1 @@
+force fsck to rebuild a corrupted rootdir w/ metadata_csum

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