• Al Viro's avatar
    Hang/soft lockup in d_invalidate with simultaneous calls · 81be24d2
    Al Viro authored
    It's not hard to trigger a bunch of d_invalidate() on the same
    dentry in parallel.  They end up fighting each other - any
    dentry picked for removal by one will be skipped by the rest
    and we'll go for the next iteration through the entire
    subtree, even if everything is being skipped.  Morevoer, we
    immediately go back to scanning the subtree.  The only thing
    we really need is to dissolve all mounts in the subtree and
    as soon as we've nothing left to do, we can just unhash the
    dentry and bugger off.
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
dcache.c 93.9 KB