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    SubjectRe: [PATCH RFC] ext3 data=guarded v3
    On Wed, 2009-04-15 at 13:22 -0400, Chris Mason wrote:
    > Hello everyone,


    > This passed a longer stress test and generally seems to be working. I
    > don't think anyone would recommend it as a default for 2.6.30, but it
    > may be a good idea to have a review party and decide if it is safe enough
    > to include so people can experiment with it.

    I know you didn't say RFT, but I did some anyway, and found a 100%
    repeatable corruption scenario wrt git+umount.

    /dev/sdf3 on /media/root type ext3 (rw,_netdev,noatime,data=guarded,acl,user_xattr)

    <user git>
    cd /media/root/home/git/testo
    git init
    cp /usr/local/src/kernel/linux-2.6.30.git/.git/config .git/.
    git fetch
    git pull
    <user root>
    umount /media/root
    mount /media/root
    <user git>
    cd /media/root/home/git/testo
    git checkout -f

    git@marge:..git/testo> git checkout -f
    error: packfile .git/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack does not match index
    error: packfile .git/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack cannot be accessed
    error: packfile .git/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack does not match index
    error: packfile .git/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack cannot be accessed
    fatal: You are on a branch yet to be born

    git@marge:..git/testo> md5sum .git/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack .git.good/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack
    a54de2e5ed5f2dd8925169b404463261 .git/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack
    88ca6b0eac30ef18e623b3a6f6490299 .git.good/objects/pack/pack-5897f5ab55217236982c43fd644e854d0c42fa97.pack
    t@marge:..git/testo> md5sum .git/index .git.good/index
    f2f9a1ffd2544841985f112e0831d2a5 .git/index
    1f88bfbe71adfd649254e3a4bd91e7fa .git.good/index

    git version
    repositoryformatversion = 0
    filemode = true
    bare = false
    logallrefupdates = true
    [remote "master"]
    url = git://localhost/~git/linux-2.6
    fetch = +refs/heads/master:refs/remotes/master/master
    [branch "master"]
    remote = master
    merge = refs/heads/master

    If I move a .git created while mounted data=writeback into this
    directory, I can mount/umount/checkout to my hearts content while
    mounted data=guarded, but if I do the fetch/pull/umount while
    data=guarded, after umount/mount, the repo is corrupt.

    Prior to umount, all seems fine, trees build, git fsck is happy etc.


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      Last update: 2009-04-16 13:41    [W:0.023 / U:48.008 seconds]
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