diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-11-26 12:58:05 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-11-29 06:41:29 -0700 |
| commit | 88c9a2ce520ba381bb70658c80ec704f4d60f728 (patch) | |
| tree | bec031fdc97a07949add2831079700f163184f95 /block/blk-ioc.c | |
| parent | e92a559e6c9db93662a6071f1ecbfa2c1c3be5d3 (diff) | |
fork: move copy_io to block/blk-ioc.c
Move the copying of the I/O context to the block layer as that is where
we can use the proper low-level interfaces.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211126115817.2087431-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-ioc.c')
| -rw-r--r-- | block/blk-ioc.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/block/blk-ioc.c b/block/blk-ioc.c index 70c99e85aee5..3b31cfad4b75 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -322,6 +322,33 @@ struct io_context *get_task_io_context(struct task_struct *task, return NULL; } +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 + */ + if (clone_flags & CLONE_IO) { + get_io_context_active(ioc); + + WARN_ON_ONCE(atomic_read(&ioc->nr_tasks) <= 0); + 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)) + return -ENOMEM; + + new_ioc->ioprio = ioc->ioprio; + put_io_context(new_ioc); + } + + return 0; +} + /** * ioc_lookup_icq - lookup io_cq from ioc * @ioc: the associated io_context |