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    SubjectRe: [EXT4 set 5][PATCH 1/1] expand inode i_extra_isize to support features in larger inode
    On Sun, 15 Jul 2007 21:21:03 +0200 Peter Zijlstra <peterz@infradead.org> wrote:

    > Shows the current stacktrace where we violate the previously established
    > locking order.

    yup, but the lock_page() which we did inside truncate_mutex was a
    lock_page() against a different address_space: the blockdev mapping.

    So this is OK - we'll never take truncate_mutex against the blockdev
    mapping (it doesn't have one, for a start ;))

    This is similar to the quite common case where we take inode A's
    i_mutex inside inode B's i_mutex, which needs special lockdep annotations.

    I think. I haven't looked into this in detail.
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