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fork: move copy_io to block/blk-ioc.c

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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>
This commit is contained in:
Christoph Hellwig 2021-11-26 12:58:05 +01:00 committed by Jens Axboe
parent e92a559e6c
commit 88c9a2ce52
3 changed files with 40 additions and 36 deletions
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27
block/blk-ioc.c
View file

@ -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

23
include/linux/iocontext.h
View file

@ -129,14 +129,6 @@ static inline void get_io_context_active(struct io_context *ioc)
atomic_inc(&ioc->active_ref);
}
static inline void ioc_task_link(struct io_context *ioc)
{
get_io_context_active(ioc);
WARN_ON_ONCE(atomic_read(&ioc->nr_tasks) <= 0);
atomic_inc(&ioc->nr_tasks);
}
struct task_struct;
#ifdef CONFIG_BLOCK
void put_io_context(struct io_context *ioc);
@ -144,10 +136,21 @@ void put_io_context_active(struct io_context *ioc);
void exit_io_context(struct task_struct *task);
struct io_context *get_task_io_context(struct task_struct *task,
gfp_t gfp_flags, int node);
int __copy_io(unsigned long clone_flags, struct task_struct *tsk);
static inline int copy_io(unsigned long clone_flags, struct task_struct *tsk)
{
if (!current->io_context)
return 0;
return __copy_io(clone_flags, tsk);
}
#else
struct io_context;
static inline void put_io_context(struct io_context *ioc) { }
static inline void exit_io_context(struct task_struct *task) { }
#endif
static inline int copy_io(unsigned long clone_flags, struct task_struct *tsk)
{
return 0;
}
#endif /* CONFIG_BLOCK */
#endif
#endif /* IOCONTEXT_H */

26
kernel/fork.c
View file

@ -1556,32 +1556,6 @@ static int copy_files(unsigned long clone_flags, struct task_struct *tsk)
return error;
}
static int copy_io(unsigned long clone_flags, struct task_struct *tsk)
{
#ifdef CONFIG_BLOCK
struct io_context *ioc = current->io_context;
struct io_context *new_ioc;
if (!ioc)
return 0;
/*
* Share io context with parent, if CLONE_IO is set
*/
if (clone_flags & CLONE_IO) {
ioc_task_link(ioc);
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);
}
#endif
return 0;
}
static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk)
{
struct sighand_struct *sig;