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aio: fix kioctx not being freed after cancellation at exit time

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The recent changes overhauling fs/aio.c introduced a bug that results in
the kioctx not being freed when outstanding kiocbs are cancelled at
exit_aio() time.  Specifically, a kiocb that is cancelled has its
completion events discarded by batch_complete_aio(), which then fails to
wake up the process stuck in free_ioctx().  Fix this by modifying the
wait_event() condition in free_ioctx() appropriately.

This patch was tested with the cancel operation in the thread based code
posted yesterday.

[[email protected]: fix build]
Signed-off-by: Benjamin LaHaise <[email protected]>
Signed-off-by: Kent Overstreet <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: Josh Boyer <[email protected]>
Cc: Zach Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Benjamin LaHaise 2013-05-24 15:55:38 -07:00 • committed by Linus Torvalds
commit 03e04f048d
1 changed files with 3 additions and 1 deletions
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4
fs/aio.c
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@ -307,7 +307,9 @@ static void free_ioctx(struct kioctx *ctx)
kunmap_atomic(ring);
while (atomic_read(&ctx->reqs_active) > 0) {
wait_event(ctx->wait, head != ctx->tail);
wait_event(ctx->wait,
head != ctx->tail ||
atomic_read(&ctx->reqs_active) <= 0);
avail = (head <= ctx->tail ? ctx->tail : ctx->nr_events) - head;