04b2fa9f8f
Most callers in the kernel want to perform synchronous file I/O, but
still have to bloat the stack with a full struct kiocb. Split out
the parts needed in filesystem code from those in the aio code, and
only allocate those needed to pass down argument on the stack. The
aio code embedds the generic iocb in the one it allocates and can
easily get back to it by using container_of.
Also add a ->ki_complete method to struct kiocb, this is used to call
into the aio code and thus removes the dependency on aio for filesystems
impementing asynchronous operations. It will also allow other callers
to substitute their own completion callback.
We also add a new ->ki_flags field to work around the nasty layering
violation recently introduced in commit 5e33f6 ("usb: gadget: ffs: add
eventfd notification about ffs events").
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#ifndef __LINUX__AIO_H
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#define __LINUX__AIO_H
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#include <linux/list.h>
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#include <linux/workqueue.h>
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#include <linux/aio_abi.h>
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#include <linux/uio.h>
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#include <linux/rcupdate.h>
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#include <linux/atomic.h>
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struct kioctx;
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struct kiocb;
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#define KIOCB_KEY 0
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typedef int (kiocb_cancel_fn)(struct kiocb *);
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#define IOCB_EVENTFD (1 << 0)
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struct kiocb {
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struct file *ki_filp;
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loff_t ki_pos;
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void (*ki_complete)(struct kiocb *iocb, long ret, long ret2);
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void *private;
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int ki_flags;
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};
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static inline bool is_sync_kiocb(struct kiocb *kiocb)
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{
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return kiocb->ki_complete == NULL;
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}
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static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
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{
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*kiocb = (struct kiocb) {
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.ki_filp = filp,
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};
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}
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/* prototypes */
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#ifdef CONFIG_AIO
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struct mm_struct;
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extern void exit_aio(struct mm_struct *mm);
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extern long do_io_submit(aio_context_t ctx_id, long nr,
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struct iocb __user *__user *iocbpp, bool compat);
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void kiocb_set_cancel_fn(struct kiocb *req, kiocb_cancel_fn *cancel);
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#else
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struct mm_struct;
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static inline void exit_aio(struct mm_struct *mm) { }
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static inline long do_io_submit(aio_context_t ctx_id, long nr,
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struct iocb __user * __user *iocbpp,
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bool compat) { return 0; }
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static inline void kiocb_set_cancel_fn(struct kiocb *req,
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kiocb_cancel_fn *cancel) { }
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#endif /* CONFIG_AIO */
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/* for sysctl: */
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extern unsigned long aio_nr;
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extern unsigned long aio_max_nr;
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#endif /* __LINUX__AIO_H */
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