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    SubjectRe: [PATCH 3/4] unionfs: restructure unionfs_setattr
    In message <>, Hugh Dickins writes:
    > On Tue, 18 Dec 2007, Erez Zadok wrote:
    > > In message <>, Hugh Dickins writes:
    > > > In order to fix unionfs truncation, we need to move the lower notify_change
    > > > out of the loop in unionfs_setattr. But when I came to do that, I couldn't
    > > [...]
    > >
    > > Hugh, I want to understand how patches 3/4 and 4/4 are related. In patch 3
    > > you say "in order to fix truncation" but you mention a truncation problem
    > > only in patch 4; is there a patch ordering problem, or they're both related
    > > to the same issue (with 3/4 being a code cleanup, and 4/4 actually fixing
    > > the problem)?
    > I needed to move that notify_change out of the loop, to fix the truncation
    > problem, but had great difficulty understanding the loop. So, just as you
    > say, made the code cleanup first in 3/4, then fixed the problem in 4/4.
    > But that cleanup does need your review and testing.

    A quick look at your setattr patches seems very promising. And I've further
    realized more cleanup is possible: because we call revalidate_chain at the
    opening to ->setattr, we're guaranteed to have a valid lower dentry, so for
    example we can remove the else case for "if (lower_dentry)".

    I'll be testing this and your other patches, plus look into the locking
    issues you brought up.


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