Hell knows what happened in commit 63b05203af57e7de4f3bb63b8b81d43bc196d32b
during 2.6.9 development. Commit introduced io_wait field which remained
write-only than and still remains write-only.
Also garbage collect macros which "use" io_wait.
Signed-off-by: Alexey Dobriyan <[EMAIL PROTECTED]>
---
fs/aio.c | 16 ++--------------
include/linux/aio.h | 12 ------------
include/linux/sched.h | 7 -------
kernel/fork.c | 1 -
4 files changed, 2 insertions(+), 34 deletions(-)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -710,18 +710,9 @@ static ssize_t aio_run_iocb(struct kiocb *iocb)
/*
* Now we are all set to call the retry method in async
- * context. By setting this thread's io_wait context
- * to point to the wait queue entry inside the currently
- * running iocb for the duration of the retry, we ensure
- * that async notification wakeups are queued by the
- * operation instead of blocking waits, and when notified,
- * cause the iocb to be kicked for continuation (through
- * the aio_wake_function callback).
+ * context.
*/
- BUG_ON(current->io_wait != NULL);
- current->io_wait = &iocb->ki_wait;
ret = retry(iocb);
- current->io_wait = NULL;
if (ret != -EIOCBRETRY && ret != -EIOCBQUEUED) {
BUG_ON(!list_empty(&iocb->ki_wait.task_list));
@@ -1508,10 +1499,7 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb)
* Simply triggers a retry of the operation via kick_iocb.
*
* This callback is specified in the wait queue entry in
- * a kiocb (current->io_wait points to this wait queue
- * entry when an aio operation executes; it is used
- * instead of a synchronous wait when an i/o blocking
- * condition is encountered during aio).
+ * a kiocb.
*
* Note:
* This routine is executed with the wait queue lock held.
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -232,18 +232,6 @@ int FASTCALL(io_submit_one(struct kioctx *ctx, struct iocb
__user *user_iocb,
__put_ioctx(kioctx); \
} while (0)
-#define in_aio() (unlikely(!is_sync_wait(current->io_wait)))
-
-/* may be used for debugging */
-#define warn_if_async()
\
-do { \
- if (in_aio()) { \
- printk(KERN_ERR "%s(%s:%d) called in async context!\n", \
- __FUNCTION__, __FILE__, __LINE__); \
- dump_stack(); \
- } \
-} while (0)
-
#define io_wait_to_kiocb(wait) container_of(wait, struct kiocb, ki_wait)
#include <linux/aio_abi.h>
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1147,13 +1147,6 @@ struct task_struct {
unsigned long ptrace_message;
siginfo_t *last_siginfo; /* For ptrace use. */
-/*
- * current io wait handle: wait queue entry to use for io waits
- * If this thread is processing aio, this points at the waitqueue
- * inside the currently handled kiocb. It may be NULL (i.e. default
- * to a stack based synchronous wait) if its doing sync IO.
- */
- wait_queue_t *io_wait;
#ifdef CONFIG_TASK_XACCT
/* i/o counters(bytes read/written, #syscalls */
u64 rchar, wchar, syscr, syscw;
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1068,7 +1068,6 @@ static struct task_struct *copy_process(unsigned long
clone_flags,
monotonic_to_bootbased(&p->real_start_time);
p->security = NULL;
p->io_context = NULL;
- p->io_wait = NULL;
p->audit_context = NULL;
cpuset_fork(p);
#ifdef CONFIG_NUMA
-
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