user/sven/linux.git/include/linux/aio.h, branch v3.9

include/linux/aio.h: cpp->C conversions

2012-07-31T00:25:21Z

Convert init_sync_kiocb() from a nasty macro into a nice C function. The struct assignment trick takes care of zeroing all unmentioned fields. Shrinks fs/read_write.o's .text from 9857 bytes to 9714. Also demacroize is_sync_kiocb() and aio_ring_avail(). The latter fixes an arg-referenced-multiple-times hand grenade. Cc: Junxiao Bi Cc: Mark Fasheh Acked-by: Jeff Moyer Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aio: make kiocb->private NUll in init_sync_kiocb()

2012-07-05T08:33:59Z

Ocfs2 uses kiocb.*private as a flag of unsigned long size. In commit a11f7e6 ocfs2: serialize unaligned aio, the unaligned io flag is involved in it to serialize the unaligned aio. As *private is not initialized in init_sync_kiocb() of do_sync_write(), this unaligned io flag may be unexpectly set in an aligned dio. And this will cause OCFS2_I(inode)->ip_unaligned_aio decreased to -1 in ocfs2_dio_end_io(), thus the following unaligned dio will hang forever at ocfs2_aiodio_wait() in ocfs2_file_aio_write(). Signed-off-by: Junxiao Bi Cc: stable@vger.kernel.org Acked-by: Jeff Moyer Signed-off-by: Joel Becker

aio: allocate kiocbs in batches

2011-11-02T23:07:03Z

In testing aio on a fast storage device, I found that the context lock takes up a fair amount of cpu time in the I/O submission path. The reason is that we take it for every I/O submitted (see __aio_get_req). Since we know how many I/Os are passed to io_submit, we can preallocate the kiocbs in batches, reducing the number of times we take and release the lock. In my testing, I was able to reduce the amount of time spent in _raw_spin_lock_irq by .56% (average of 3 runs). The command I used to test this was: aio-stress -O -o 2 -o 3 -r 8 -d 128 -b 32 -i 32 -s 16384 I also tested the patch with various numbers of events passed to io_submit, and I ran the xfstests aio group of tests to ensure I didn't break anything. Signed-off-by: Jeff Moyer Cc: Daniel Ehrenberg Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

atomic: use

2011-07-26T23:49:47Z

This allows us to move duplicated code in (atomic_inc_not_zero() for now) to Signed-off-by: Arun Sharma Reviewed-by: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Cc: Eric Dumazet Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aio: fix the compat vectored operations

2010-05-27T16:12:53Z

The aio compat code was not converting the struct iovecs from 32bit to 64bit pointers, causing either EINVAL to be returned from io_getevents, or EFAULT as the result of the I/O. This patch passes a compat flag to io_submit to signal that pointer conversion is necessary for a given iocb array. A variant of this was tested by Michael Tokarev. I have also updated the libaio test harness to exercise this code path with good success. Further, I grabbed a copy of ltp and ran the testcases/kernel/syscall/readv and writev tests there (compiled with -m32 on my 64bit system). All seems happy, but extra eyes on this would be welcome. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix CONFIG_COMPAT=n build] Signed-off-by: Jeff Moyer Reported-by: Michael Tokarev Cc: Zach Brown Cc: [2.6.35.1] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aio: remove unused field

2009-12-16T15:20:13Z

Don't know the reason, but it appears ki_wait field of iocb never gets used. Signed-off-by: Shaohua Li Cc: Jeff Moyer Cc: Benjamin LaHaise Cc: Zach Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

includecheck fix: include/linux, aio.h

2009-09-20T10:39:20Z

fix the following 'make includecheck' warning: include/linux/aio.h: linux/aio_abi.h is included more than once. Signed-off-by: Jaswinder Singh Rajput Cc: bcrl@kvack.org Cc: Sam Ravnborg LKML-Reference: <1247068254.4382.101.camel@ht.satnam>

eventfd: revised interface and cleanups

2009-07-01T01:55:58Z

Change the eventfd interface to de-couple the eventfd memory context, from the file pointer instance. Without such change, there is no clean way to racely free handle the POLLHUP event sent when the last instance of the file* goes away. Also, now the internal eventfd APIs are using the eventfd context instead of the file*. This patch is required by KVM's IRQfd code, which is still under development. Signed-off-by: Davide Libenzi Cc: Gregory Haskins Cc: Rusty Russell Cc: Benjamin LaHaise Cc: Avi Kivity Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aio: make the lookup_ioctx() lockless

2008-12-29T07:29:50Z

The mm->ioctx_list is currently protected by a reader-writer lock, so we always grab that lock on the read side for doing ioctx lookups. As the workload is extremely reader biased, turn this into an rcu hlist so we can make lookup_ioctx() lockless. Get rid of the rwlock and use a spinlock for providing update side exclusion. There's usually only 1 entry on this list, so it doesn't make sense to look into fancier data structures. Reviewed-by: Jeff Moyer Signed-off-by: Jens Axboe

Configure out AIO support

2008-10-16T18:21:51Z

This patchs adds the CONFIG_AIO option which allows to remove support for asynchronous I/O operations, that are not necessarly used by applications, particularly on embedded devices. As this is a size-reduction option, it depends on CONFIG_EMBEDDED. It allows to save ~7 kilobytes of kernel code/data: text data bss dec hex filename 1115067 119180 217088 1451335 162547 vmlinux 1108025 119048 217088 1444161 160941 vmlinux.new -7042 -132 0 -7174 -1C06 +/- This patch has been originally written by Matt Mackall , and is part of the Linux Tiny project. [randy.dunlap@oracle.com: build fix] Signed-off-by: Thomas Petazzoni Cc: Benjamin LaHaise Cc: Zach Brown Signed-off-by: Matt Mackall Signed-off-by: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds