These tell the scheduler that we're waiting on IO, and still "busy".
Signed-off-by: Eric Anholt <e...@anholt.net>
---
include/linux/wait.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 3efc9f3..b299c2b 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -202,6 +202,19 @@ do {
\
finish_wait(&wq, &__wait); \
} while (0)
+#define __io_wait_event(wq, condition)
\
+do { \
+ DEFINE_WAIT(__wait); \
+ \
+ for (;;) { \
+ prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
+ if (condition) \
+ break; \
+ io_schedule(); \
+ } \
+ finish_wait(&wq, &__wait); \
+} while (0)
+
/**
* wait_event - sleep until a condition gets true
* @wq: the waitqueue to wait on
@@ -221,6 +234,13 @@ do {
\
__wait_event(wq, condition); \
} while (0)
+#define io_wait_event(wq, condition) \
+do { \
+ if (condition) \
+ break; \
+ __io_wait_event(wq, condition); \
+} while (0)
+
#define __wait_event_timeout(wq, condition, ret) \
do { \
DEFINE_WAIT(__wait); \
@@ -260,6 +280,24 @@ do {
\
__ret; \
})
+#define __io_wait_event_interruptible(wq, condition, ret) \
+do { \
+ DEFINE_WAIT(__wait); \
+ \
+ for (;;) { \
+ prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
+ if (condition) \
+ break; \
+ if (!signal_pending(current)) { \
+ io_schedule(); \
+ continue; \
+ } \
+ ret = -ERESTARTSYS; \
+ break; \
+ } \
+ finish_wait(&wq, &__wait); \
+} while (0)
+
#define __wait_event_interruptible(wq, condition, ret) \
do { \
DEFINE_WAIT(__wait); \
@@ -301,6 +339,14 @@ do {
\
__ret; \
})
+#define io_wait_event_interruptible(wq, condition) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __io_wait_event_interruptible(wq, condition, __ret); \
+ __ret; \
+})
+
#define __wait_event_interruptible_timeout(wq, condition, ret) \
do { \
DEFINE_WAIT(__wait); \
--
1.7.2.3
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