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block: use alloc_io_context in __copy_io

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In __copy_io we know that the newly allocate task_struct does not have
an I/O context yet and is not exiting.  So just allocate the I/O context
struct and install it directly.  There is no need to lock the task
either as it is just being created.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211126115817.2087431-12-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-11-26 12:58:14 +01:00 committed by Jens Axboe
parent a0f14d8baa
commit 8ffc13680e
1 changed files with 3 additions and 6 deletions
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9
block/blk-ioc.c
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@ -336,7 +336,6 @@ struct io_context *get_task_io_context(struct task_struct *task,
int __copy_io(unsigned long clone_flags, struct task_struct *tsk)
{
struct io_context *ioc = current->io_context;
struct io_context *new_ioc;
/*
* Share io context with parent, if CLONE_IO is set
@ -347,12 +346,10 @@ int __copy_io(unsigned long clone_flags, struct task_struct *tsk)
atomic_inc(&ioc->nr_tasks);
tsk->io_context = ioc;
} else if (ioprio_valid(ioc->ioprio)) {
new_ioc = get_task_io_context(tsk, GFP_KERNEL, NUMA_NO_NODE);
if (unlikely(!new_ioc))
tsk->io_context = alloc_io_context(GFP_KERNEL, NUMA_NO_NODE);
if (!tsk->io_context)
return -ENOMEM;
new_ioc->ioprio = ioc->ioprio;
put_io_context(new_ioc);
tsk->io_context->ioprio = ioc->ioprio;
}
return 0;