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aio: implement io_pgetevents

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This is the io_getevents equivalent of ppoll/pselect and allows to
properly mix signals and aio completions (especially with IOCB_CMD_POLL)
and atomically executes the following sequence:

	sigset_t origmask;

	pthread_sigmask(SIG_SETMASK, &sigmask, &origmask);
	ret = io_getevents(ctx, min_nr, nr, events, timeout);
	pthread_sigmask(SIG_SETMASK, &origmask, NULL);

Note that unlike many other signal related calls we do not pass a sigmask
size, as that would get us to 7 arguments, which aren't easily supported
by the syscall infrastructure.  It seems a lot less painful to just add a
new syscall variant in the unlikely case we're going to increase the
sigset size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig
2018-05-02 19:51:00 +02:00
parent a3c0d439e4
commit 7a074e96de
8 changed files with 131 additions and 12 deletions
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6
include/uapi/linux/aio_abi.h
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@@ -29,6 +29,7 @@
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/signal.h>
#include <asm/byteorder.h>
typedef __kernel_ulong_t aio_context_t;
@@ -108,5 +109,10 @@ struct iocb {
#undef IFBIG
#undef IFLITTLE
struct __aio_sigset {
sigset_t __user *sigmask;
size_t sigsetsize;
};
#endif /* __LINUX__AIO_ABI_H */