On 5/24/2011 12:18 PM, Theodore Ts'o wrote:
Hi Allison,
I was finally able to track down the source of the regression with a
stable repro case, and a git bisect pointed at this commit:
b1235954684b05c945ab08defe1547b8ffa1a759 is the first bad commit
commit b1235954684b05c945ab08defe1547b8ffa1a759
Author: Allison Henderson<achender@xxxxxxxxxxxxxxxxxx>
Date: Mon May 16 16:04:13 2011 -0400
ext4: add support for "hole punch" out in the truncate routines for
extents
This patch modifies the truncate routines to support hole punching
Below is a brief summary of the patches changes:
- Added end param to ext_ext4_rm_leaf
This function has been modified to accept an end parameter
which enables it to punch holes in leafs instead of just
truncating them.
- Implemented the "remove head" case in the ext_remove_blocks routine
This routine is used by ext_ext4_rm_leaf to remove the tail
of an extent during a truncate. The new ext_ext4_rm_leaf
routine will now also use it to remove the head of an extent in the
case that the hole covers a region of blocks at the beginning
of an extent.
- Added "end" param to ext4_ext_remove_space routine
This function has been modified to accept a stop parameter, which
is passed through to ext4_ext_rm_leaf.
[ext4 punch hole patch series 3/5 v7]
Signed-off-by: Allison Henderson<achender@xxxxxxxxxx>
Signed-off-by: "Theodore Ts'o"<tytso@xxxxxxx>
Reviewed-by: Mingming Cao<cmm@xxxxxxxxxx>
(This commit can be found on the dev-save branch of ext4.git).
Here's the reproduction information. Use the following[1] as the image
for TEST_DEV for xfstests, and run xfstests #213. You will get a
message indicating that the file system was corrupted after the test
completes.
[1]
ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/ext4-testcases/test-4k-213-bug-report.img.bz2
In case this is significant, I was running my kernels under KVM, using
the following parameters:
/usr/local/bin/qemu-system-x86_64 -boot order=c \
-drive file=/kbuild/root_fs.img,if=virtio \
-drive file=/dev/funarg/test-4k,cache=none,if=virtio \
-drive file=/dev/funarg/big-scratch,cache=none,if=virtio \
-drive file=/dev/funarg/test-1k,cache=none,if=virtio \
-serial telnet::4445,server -smp 2 -m 1024 \
--kernel /kbuild/ext4/arch/x86/boot/bzImage \
--append "root=fe00 console=ttyS0,115200 console=tty0"&
sleep 0.5
exec xterm -e script -c "telnet 127.0.0.1 4445" /tmp/kvm-console&
The file system corruption is quite distinctive; I will attach it at the
end of this message.
What to do --- what I am currently thinking about doing is to drop
patches 3/5, 4/5, and 5/5 from the punch series, since we're running out
of time in this short merge window. I've already tried building a patch
series with these patches dropped, and (a) none of the patches needed
modification, and (b) this problem disappeared. So it seems pretty
clear it's a problem with patch 3/5 in the punch patch series.
If we can figure out what is going quickly, we can try to add revised
patches back to the merge window. Does that sound fair?
- Ted
e2fsck 1.41.14 (22-Dec-2010)
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
Block bitmap differences: -(8562--8595) -(8606--8615) -(8620--8839)
-(8852--8874) -(8888--8919) -(8929--8959) -(8986--8999) -(9008--9208)
-(9236--9246) -(9260--9373) -(33090--33091) -(33218--33223)
-(33246--33247) -(33280--33283) -(33300--33303) -(33348--33349)
-(33454--33455) -(33516--33517) -(33528--33529) -(33582--33583)
-(33615--33621) -(33628--33633) -(33665--33666) -(33670--33671)
-(33680--33684) -(33710--33717) -(33752--33759) -(33807--33809)
-(33857--33858) -33882 -(33952--33956) -(34034--34035) -34090
-(34105--34126) -(34157--34167) -34175 -(34192--34194) -(34207--34209)
-(34233--34240) -(34252--34282) -(34302--34303) -(34368--34404)
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-(34926--34973) -(34978--35054) -35056 -(35082--35106) -(35124--35191)
-(35201--35252) -(35266--35348) -(35359--35397) -(35413--35461)
-(35466--35536) -(35560--35589) -(35601--35627) -(35646--35681) -(35711-
-3!
5754) -(35776--35780) -(35782--35862) -(35866--35918) -(35927--35990)
-(36016--36146) -(36149--36232) -(36243--36293) -(36322--36420)
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-(40399--40519) -(40525--40635) -(40640--40671) -(40705--40744)
-(40764--40806) -(40812--40982) -(40989--41006) -(41028--41087)
-(41096--41332) -(41344--41442) -(41468--41696) -(41717--41848)
-(41882--42075) -(42107--42268) -(42298--42661) -(42688--42782)
-(42784--429
16)!
-(42946--43117) -(43147--43391) -(43398--43631) -(43636--4378!
3) -(43815--44031) -(44288--44517) -(44530--44543) -(45492--45765)
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-(66582--66610) -(66624--66679) -(66684--66706) -(66739--66800)
-(66808--66828) -(66832--66897) -(66924--66932) -(66937--66985)
-(67015--67108) -(67118--67151) -(67176--67192) -(67209--67337)
-(67352--67382) -(67404--67412) -(67414--67521) -(67551--67667)
-(67693--67752) -(67776--67901) -(67929--67947) -(67975--67989)
-(68017--68055) -(68075--68190) -(68217--68232) -(68252--68268)
-(68286--68334) -(68364--68450) -(68470--68600) -(68602--68614)
-(68633--68772)
-(!
68800--68824) -(68831--68838) -(68878--69038) -(69059--69135)
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-(69491--69578) -(69610--69750) -(69779--69908) -(69937--70038)
-(70044--70084) -(70115--70198) -(70217--70468) -(70494--70869)
-(70899--71024) -(98625--163839) -(196608--229375) -(230988--231167)
-(231424--294911) -(295233--360437) -(360439--524277) -534050 -534078
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-601178 -(601251--601252) -6
013!
27 -(601425--601427) -601482 -(601517--601519) -601600 -(601625--601626!
) -(601726--601728) -(601738--601741) -(601756--601767)
-(601780--601783) -(601842--601853) -(601868--601886)
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-(1048600--1048607) -(1081344--1146869) -(1146871--1310709)
Fix? yes
Free blocks count wrong for group #0 (23379, counted=24069).
Fix? yes
Free blocks count wrong for group #1 (18867, counted=29461).
Fix? yes
Free blocks count wrong for group #2 (27266, counted=31479).
Fix? yes
Free blocks count wrong for group #3 (0, counted=32447).
Fix? yes
Free blocks count wrong for group #4 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #6 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #7 (1547, counted=32447).
Fix? yes
Free blocks count wrong for group #8 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #9 (0, counted=32447).
Fix? yes
Free blocks count wrong for group #10 (1, counted=32768).
Fix? yes
Free blocks count wrong for group #11 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #12 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #13 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #14 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #15 (10, counted=32768).
Fix? yes
Free blocks count wrong for group #16 (0, counted=22872).
Fix? yes
Free blocks count wrong for group #18 (0, counted=20068).
Fix? yes
Free blocks count wrong for group #19 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #20 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #21 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #22 (1, counted=32768).
Fix? yes
Free blocks count wrong for group #23 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #24 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #25 (0, counted=32447).
Fix? yes
Free blocks count wrong for group #26 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #27 (0, counted=32447).
Fix? yes
Free blocks count wrong for group #28 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #29 (10, counted=32768).
Fix? yes
Free blocks count wrong for group #30 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #31 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #32 (28640, counted=28656).
Fix? yes
Free blocks count wrong for group #33 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #34 (1, counted=32768).
Fix? yes
Free blocks count wrong for group #35 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #36 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #37 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #38 (0, counted=32768).
Fix? yes
Free blocks count wrong for group #39 (10, counted=32768).
Fix? yes
Free blocks count wrong (132179, counted=1236023).
Fix? yes
/dev/funarg/test-4k: ***** FILE SYSTEM WAS MODIFIED *****
/dev/funarg/test-4k: 5541/327680 files (2.9% non-contiguous),
74697/1310720 blocks
Hi Ted,
I have recreated the problem and am checking into it now. Thx!
Allison Henderson
