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6a1162d4cd
Implement the linux_io_* syscalls (AIO). They are only enabled if the native
AIO code is available (either compiled in to the kernel or as a module) at
the time the functions are used. If the AIO stuff is not available there
will be a ENOSYS.
From the submitter:
---snip---
DESIGN NOTES:
1. Linux permits a process to own multiple AIO queues (distinguished by
"context"), but FreeBSD creates only one single AIO queue per process.
My code maintains a request queue (STAILQ of queue(3)) per "context",
and throws all AIO requests of all contexts owned by a process into
the single FreeBSD per-process AIO queue.
When the process calls io_destroy(2), io_getevents(2), io_submit(2) and
io_cancel(2), my code can pick out requests owned by the specified context
from the single FreeBSD per-process AIO queue according to the per-context
request queues maintained by my code.
2. The request queue maintained by my code stores contrast information between
Linux IO control blocks (struct linux_iocb) and FreeBSD IO control blocks
(struct aiocb). FreeBSD IO control block actually exists in userland memory
space, required by FreeBSD native aio_XXXXXX(2).
3. It is quite troubling that the function io_getevents() of libaio-0.3.105
needs to use Linux-specific "struct aio_ring", which is a partial mirror
of context in user space. I would rather take the address of context in
kernel as the context ID, but the io_getevents() of libaio forces me to
take the address of the "ring" in user space as the context ID.
To my surprise, one comment line in the file "io_getevents.c" of
libaio-0.3.105 reads:
Ben will hate me for this
REFERENCE:
1. Linux kernel source code: http://www.kernel.org/pub/linux/kernel/v2.6/
(include/linux/aio_abi.h, fs/aio.c)
2. Linux manual pages: http://www.kernel.org/pub/linux/docs/manpages/
(io_setup(2), io_destroy(2), io_getevents(2), io_submit(2), io_cancel(2))
3. Linux Scalability Effort: http://lse.sourceforge.net/io/aio.html
The design notes: http://lse.sourceforge.net/io/aionotes.txt
4. The package libaio, both source and binary:
http://rpmfind.net/linux/rpm2html/search.php?query=libaio
Simple transparent interface to Linux AIO system calls.
5. Libaio-oracle: http://oss.oracle.com/projects/libaio-oracle/
POSIX AIO implementation based on Linux AIO system calls (depending on
libaio).
---snip---
Submitted by: Li, Xiao <intron@intron.ac>
52 lines
1.5 KiB
Makefile
52 lines
1.5 KiB
Makefile
# $FreeBSD$
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.if ${MACHINE_ARCH} == "amd64"
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SFX= 32
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CFLAGS+=-DCOMPAT_IA32 -DCOMPAT_LINUX32
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.endif
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.PATH: ${.CURDIR}/../../compat/linux ${.CURDIR}/../../${MACHINE_ARCH}/linux${SFX}
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KMOD= linux
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SRCS= linux_aio.c linux${SFX}_dummy.c linux_emul.c linux_file.c \
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linux_futex.c linux_getcwd.c linux_ioctl.c linux_ipc.c \
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linux${SFX}_machdep.c linux_mib.c linux_misc.c linux_signal.c \
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linux_socket.c linux_stats.c linux_sysctl.c linux${SFX}_sysent.c \
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linux${SFX}_sysvec.c linux_uid16.c linux_util.c linux_time.c \
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opt_inet6.h opt_mac.h opt_compat.h opt_posix.h vnode_if.h \
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device_if.h bus_if.h
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OBJS= linux${SFX}_locore.o
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.if ${MACHINE_ARCH} == "i386"
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SRCS+= linux_ptrace.c imgact_linux.c opt_cpu.h
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.endif
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EXPORT_SYMS=
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EXPORT_SYMS+= linux_emul_path
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EXPORT_SYMS+= linux_get_osname
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EXPORT_SYMS+= linux_get_osrelease
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EXPORT_SYMS+= linux_ifname
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EXPORT_SYMS+= linux_ioctl_register_handler
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EXPORT_SYMS+= linux_ioctl_unregister_handler
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CLEANFILES= linux${SFX}_assym.h linux${SFX}_genassym.o
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linux${SFX}_assym.h: linux${SFX}_genassym.o
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.if exists(@)
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linux${SFX}_assym.h: @/kern/genassym.sh
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.endif
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sh @/kern/genassym.sh linux${SFX}_genassym.o > ${.TARGET}
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linux${SFX}_locore.o: linux${SFX}_locore.s linux${SFX}_assym.h
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${CC} -c -x assembler-with-cpp -DLOCORE ${CFLAGS} \
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${.IMPSRC} -o ${.TARGET}
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linux${SFX}_genassym.o: linux${SFX}_genassym.c linux.h @ machine
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${CC} -c ${CFLAGS:N-fno-common} ${.IMPSRC}
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.if !defined(KERNBUILDDIR)
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opt_inet6.h:
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echo "#define INET6 1" > opt_inet6.h
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.endif
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.include <bsd.kmod.mk>
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