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    SubjectRe: [PATCH 0/20] return f_fsid for statfs(2)
    These patches probably belong in linux-fsdevel, but I hesitate to ask
    you to repost all twenty.

    On Tue, 2009-01-20 at 01:30 +0800, Coly Li wrote:
    > Currently many file systems in Linux kernel do not return f_fsid in statfs info, the value is set as
    > 0 in vfs layer. Anyway, in some conditions, f_fsid from statfs(2) is useful, especially being used
    > as (f_fsid, ino) pair to uniquely identify a file.
    > Basic idea of the patches is generating a unique fs ID by huge_encode_dev(sb->s_bdev->bd_dev) during
    > file system mounting life time (no endian consistent issue). sb is a point of struct super_block of
    > current mounted file system being accessed by statfs(2).

    ext[234] return a portion of the uuid in f_fsid. There is a theoretical
    chance of those values being non-unique. Since there doesn't appear to
    be any case for the fsid to be persistent between boots, I guess
    huge_encode_dev() is probably a better choice. In practice it probably
    makes no difference.

    > The patches are quite simple, any feedback or patch review is welcome.

    They look reasonable to me.

    David Kleikamp
    IBM Linux Technology Center

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