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SubjectRe: [RFC PATCH 1/2] vfs: Introduce on-demand filesystem initialisation
On Sun, Jun 01, 2008 at 03:51:54PM +0100, Tom Spink wrote:

Occam's Razor...

You've just serialized ->kill_sb() for given fs type (and made sure that
if one gets stuck, _everything_ gets stuck). Moreover, you've serialized
sget() against the same thing (i.e. pretty much each ->get_sb()).

All of that (and a couple of new methods) is done for something that just
plain does not belong to VFS. It's trivially doable in filesystem *and*
it's about the objects with lifetimes that make sense only for filesystem

Hell, just do

int want_xfs_threads(void)
int res = 0;
if (!count++) {
start threads
if failed {
res = -Esomething;
return res;

void leave_xfs_threads(void)
if (!--count)
stop threads

Call want_xfs_threads() in xfs_fs_fill_super(); call leave_xfs_threads() in
the end of xfs_put_super() and on failure exit from xfs_fs_fill_super().
End of story... Any other fs that wants such things can do the same.

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