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.
-ben
Signed-off-by: Benjamin LaHaise <[email protected]>
diff -purN v2.6.12-rc6/fs/read_write.c uml-rc6/fs/read_write.c
--- v2.6.12-rc6/fs/read_write.c 2005-06-13 02:08:02.000000000 -0400
+++ uml-rc6/fs/read_write.c 2005-06-13 14:04:13.272313776 -0400
@@ -203,6 +203,16 @@ Einval:
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,
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,
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;
-
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