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block: Fix io_context leak after failure of clone with CLONE_IO

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With CLONE_IO, parent's io_context->nr_tasks is incremented, but never
decremented whenever copy_process() fails afterwards, which prevents
exit_io_context() from calling IO schedulers exit functions.

Give a task_struct to exit_io_context(), and call exit_io_context() instead of
put_io_context() in copy_process() cleanup path.

Signed-off-by: Louis Rilling <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Louis Rilling 2009-12-04 14:52:42 +01:00 • committed by Jens Axboe
commit b69f229206
4 changed files with 11 additions and 9 deletions
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10
block/blk-ioc.c
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@ -66,14 +66,14 @@ static void cfq_exit(struct io_context *ioc)
}
/* Called by the exitting task */
void exit_io_context(void)
void exit_io_context(struct task_struct *task)
{
struct io_context *ioc;
task_lock(current);
ioc = current->io_context;
current->io_context = NULL;
task_unlock(current);
task_lock(task);
ioc = task->io_context;
task->io_context = NULL;
task_unlock(task);
if (atomic_dec_and_test(&ioc->nr_tasks)) {
if (ioc->aic && ioc->aic->exit)