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[PATCH] aio: fix do_sync_(read|write) to properly handle aio retries

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When do_sync_(read|write) encounters an aio method that makes use of the
retry mechanism, they fail to correctly retry the operation.  This fixes
that by adding the appropriate sleep and retry mechanism.

Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Benjamin LaHaise 2005-06-23 00:10:27 -07:00 committed by Linus Torvalds
parent 4452ea509e
commit 63e6880918
1 changed files with 18 additions and 2 deletions
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20
fs/read_write.c
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@ -203,6 +203,16 @@ int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count
return -EINVAL;
}
static void wait_on_retry_sync_kiocb(struct kiocb *iocb)
{
set_current_state(TASK_UNINTERRUPTIBLE);
if (!kiocbIsKicked(iocb))
schedule();
else
kiocbClearKicked(iocb);
__set_current_state(TASK_RUNNING);
}
ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
{
struct kiocb kiocb;
@ -210,7 +220,10 @@ ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *pp
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
ret = filp->f_op->aio_read(&kiocb, buf, len, kiocb.ki_pos);
while (-EIOCBRETRY ==
(ret = filp->f_op->aio_read(&kiocb, buf, len, kiocb.ki_pos)))
wait_on_retry_sync_kiocb(&kiocb);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&kiocb);
*ppos = kiocb.ki_pos;
@ -258,7 +271,10 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
init_sync_kiocb(&kiocb, filp);
kiocb.ki_pos = *ppos;
ret = filp->f_op->aio_write(&kiocb, buf, len, kiocb.ki_pos);
while (-EIOCBRETRY ==
(ret = filp->f_op->aio_write(&kiocb, buf, len, kiocb.ki_pos)))
wait_on_retry_sync_kiocb(&kiocb);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&kiocb);
*ppos = kiocb.ki_pos;