#ifndef __LIBCFS_LINUX_WAIT_BIT_H
#define __LIBCFS_LINUX_WAIT_BIT_H
+/* Make sure we can see if we have TASK_NOLOAD */
+#include <linux/sched.h>
/*
* Linux wait-bit related types and methods:
*/
wait_queue_entry_t *wq_entry, int state);
#endif
+/* ___wait_cond_timeout changed number of args in v3.12-rc1-78-g35a2af94c7ce
+ * so let's define our own ___wait_cond_timeout1
+ */
+
+#define ___wait_cond_timeout1(condition) \
+({ \
+ bool __cond = (condition); \
+ if (__cond && !__ret) \
+ __ret = 1; \
+ __cond || !__ret; \
+})
+
#ifndef HAVE_CLEAR_AND_WAKE_UP_BIT
/**
* clear_and_wake_up_bit - clear a bit and wake up anyone waiting on that bit
#endif /* ! HAVE_CLEAR_AND_WAKE_UP_BIT */
#ifndef HAVE_WAIT_VAR_EVENT
+extern void __init wait_bit_init(void);
extern void init_wait_var_entry(struct wait_bit_queue_entry *wbq_entry,
void *var, int flags);
extern void wake_up_var(void *var);
})
#define __wait_var_event_timeout(var, condition, timeout) \
- ___wait_var_event(var, ___wait_cond_timeout(condition), \
+ ___wait_var_event(var, ___wait_cond_timeout1(condition), \
TASK_UNINTERRUPTIBLE, 0, timeout, \
__ret = schedule_timeout(__ret))
({ \
long __ret = timeout; \
might_sleep(); \
- if (!___wait_cond_timeout(condition)) \
+ if (!___wait_cond_timeout1(condition)) \
__ret = __wait_var_event_timeout(var, condition, timeout); \
__ret; \
})
+#else /* !HAVE_WAIT_VAR_EVENT */
+/* linux-3.10.0-1062.el7 defines wait_var_event_timeout() using
+ * __wait_cond_timeout(), but doesn't define __wait_cond_timeout !!!
+ */
+# ifndef __wait_cond_timeout
+# define ___wait_cond_timeout(condition) \
+({ \
+ bool __cond = (condition); \
+ if (__cond && !__ret) \
+ __ret = 1; \
+ __cond || !__ret; \
+})
+# endif /* __wait_cond_timeout */
+
#endif /* ! HAVE_WAIT_VAR_EVENT */
+/*
+ * prepare_to_wait_event() does not support an exclusive
+ * lifo wait.
+ * However it will not relink the wait_queue_entry if
+ * it is already linked. So we link to the head of the
+ * queue here, and it will stay there.
+ */
+static inline void prepare_to_wait_exclusive_head(
+ wait_queue_head_t *waitq, wait_queue_entry_t *link)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&(waitq->lock), flags);
+#ifdef HAVE_WAIT_QUEUE_ENTRY_LIST
+ if (list_empty(&link->entry))
+#else
+ if (list_empty(&link->task_list))
+#endif
+ __add_wait_queue_exclusive(waitq, link);
+ spin_unlock_irqrestore(&((waitq)->lock), flags);
+}
+
+#ifndef ___wait_event
+/*
+ * The below macro ___wait_event() has an explicit shadow of the __ret
+ * variable when used from the wait_event_*() macros.
+ *
+ * This is so that both can use the ___wait_cond_timeout1() construct
+ * to wrap the condition.
+ *
+ * The type inconsistency of the wait_event_*() __ret variable is also
+ * on purpose; we use long where we can return timeout values and int
+ * otherwise.
+ */
+
+#define ___wait_event(wq_head, condition, state, exclusive, ret, cmd) \
+({ \
+ __label__ __out; \
+ wait_queue_entry_ __wq_entry; \
+ long __ret = ret; /* explicit shadow */ \
+ \
+ init_wait(&__wq_entry); \
+ if (exclusive) \
+ __wq_entry.flags = WQ_FLAG_EXCLUSIVE \
+ for (;;) { \
+ long __int = prepare_to_wait_event(&wq_head, \
+ &__wq_entry, state); \
+ \
+ if (condition) \
+ break; \
+ \
+ if (___wait_is_interruptible(state) && __int) { \
+ __ret = __int; \
+ goto __out; \
+ } \
+ \
+ cmd; \
+ } \
+ finish_wait(&wq_head, &__wq_entry); \
+__out: __ret; \
+})
+#endif
+
+#ifndef TASK_NOLOAD
+
+#define TASK_IDLE TASK_INTERRUPTIBLE
+
+#define ___wait_event_idle(wq_head, condition, exclusive, ret, cmd) \
+({ \
+ wait_queue_entry_t __wq_entry; \
+ unsigned long flags; \
+ long __ret = ret; /* explicit shadow */ \
+ sigset_t __old_blocked, __new_blocked; \
+ \
+ siginitset(&__new_blocked, LUSTRE_FATAL_SIGS); \
+ sigprocmask(0, &__new_blocked, &__old_blocked); \
+ init_wait(&__wq_entry); \
+ if (exclusive) \
+ __wq_entry.flags = WQ_FLAG_EXCLUSIVE; \
+ for (;;) { \
+ prepare_to_wait_event(&wq_head, \
+ &__wq_entry, \
+ TASK_INTERRUPTIBLE); \
+ \
+ if (condition) \
+ break; \
+ /* We have to do this here because some signals */ \
+ /* are not blockable - ie from strace(1). */ \
+ /* In these cases we want to schedule_timeout() */ \
+ /* again, because we don't want that to return */ \
+ /* -EINTR when the RPC actually succeeded. */ \
+ /* the recalc_sigpending() below will deliver the */ \
+ /* signal properly. */ \
+ if (signal_pending(current)) { \
+ spin_lock_irqsave(¤t->sighand->siglock, \
+ flags); \
+ clear_tsk_thread_flag(current, TIF_SIGPENDING); \
+ spin_unlock_irqrestore(¤t->sighand->siglock,\
+ flags); \
+ } \
+ cmd; \
+ } \
+ finish_wait(&wq_head, &__wq_entry); \
+ sigprocmask(SIG_SETMASK, &__old_blocked, NULL); \
+ __ret; \
+})
+
+#define wait_event_idle(wq_head, condition) \
+do { \
+ might_sleep(); \
+ if (!(condition)) \
+ ___wait_event_idle(wq_head, condition, 0, 0, schedule());\
+} while (0)
+
+#define wait_event_idle_exclusive(wq_head, condition) \
+do { \
+ might_sleep(); \
+ if (!(condition)) \
+ ___wait_event_idle(wq_head, condition, 1, 0, schedule());\
+} while (0)
+
+#define __wait_event_idle_exclusive_timeout(wq_head, condition, timeout)\
+ ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition), \
+ 1, timeout, \
+ __ret = schedule_timeout(__ret))
+
+#define wait_event_idle_exclusive_timeout(wq_head, condition, timeout) \
+({ \
+ long __ret = timeout; \
+ might_sleep(); \
+ if (!___wait_cond_timeout1(condition)) \
+ __ret = __wait_event_idle_exclusive_timeout( \
+ wq_head, condition, timeout); \
+ __ret; \
+})
+
+#define __wait_event_idle_exclusive_timeout_cmd(wq_head, condition, \
+ timeout, cmd1, cmd2) \
+ ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition), \
+ 1, timeout, \
+ cmd1; __ret = schedule_timeout(__ret); cmd2)
+
+#define wait_event_idle_exclusive_timeout_cmd(wq_head, condition, timeout,\
+ cmd1, cmd2) \
+({ \
+ long __ret = timeout; \
+ if (!___wait_cond_timeout1(condition)) \
+ __ret = __wait_event_idle_exclusive_timeout_cmd( \
+ wq_head, condition, timeout, cmd1, cmd2); \
+ __ret; \
+})
+
+#define __wait_event_idle_timeout(wq_head, condition, timeout) \
+ ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition), \
+ 0, timeout, \
+ __ret = schedule_timeout(__ret))
+
+#define wait_event_idle_timeout(wq_head, condition, timeout) \
+({ \
+ long __ret = timeout; \
+ might_sleep(); \
+ if (!___wait_cond_timeout1(condition)) \
+ __ret = __wait_event_idle_timeout(wq_head, condition, \
+ timeout); \
+ __ret; \
+})
+
+#else /* TASK_IDLE */
+#ifndef wait_event_idle
+/**
+ * wait_event_idle - wait for a condition without contributing to system load
+ * @wq_head: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ *
+ * The process is put to sleep (TASK_IDLE) until the
+ * @condition evaluates to true.
+ * The @condition is checked each time the waitqueue @wq_head is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ */
+#define wait_event_idle(wq_head, condition) \
+do { \
+ might_sleep(); \
+ if (!(condition)) \
+ ___wait_event(wq_head, condition, TASK_IDLE, 0, 0, \
+ schedule()); \
+} while (0)
+#endif
+#ifndef wait_event_idle_exclusive
+/**
+ * wait_event_idle_exclusive - wait for a condition without contributing to
+ * system load
+ * @wq_head: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ *
+ * The process is put to sleep (TASK_IDLE) until the
+ * @condition evaluates to true.
+ * The @condition is checked each time the waitqueue @wq_head is woken up.
+ *
+ * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
+ * set thus if other processes wait on the same list, when this
+ * process is woken further processes are not considered.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ */
+#define wait_event_idle_exclusive(wq_head, condition) \
+do { \
+ might_sleep(); \
+ if (!(condition)) \
+ ___wait_event(wq_head, condition, TASK_IDLE, 1, 0, \
+ schedule()); \
+} while (0)
+#endif
+#ifndef wait_event_idle_exclusive_timeout
+/**
+ * wait_event_idle_exclusive_timeout - sleep without load until a condition
+ * becomes true or a timeout elapses
+ * @wq_head: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, in jiffies
+ *
+ * The process is put to sleep (TASK_IDLE) until the
+ * @condition evaluates to true. The @condition is checked each time
+ * the waitqueue @wq_head is woken up.
+ *
+ * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
+ * set thus if other processes wait on the same list, when this
+ * process is woken further processes are not considered.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * Returns:
+ * 0 if the @condition evaluated to %false after the @timeout elapsed,
+ * 1 if the @condition evaluated to %true after the @timeout elapsed,
+ * or the remaining jiffies (at least 1) if the @condition evaluated
+ * to %true before the @timeout elapsed.
+ */
+#define wait_event_idle_exclusive_timeout(wq_head, condition, timeout) \
+({ \
+ long __ret = timeout; \
+ might_sleep(); \
+ if (!___wait_cond_timeout1(condition)) \
+ __ret = __wait_event_idle_exclusive_timeout(wq_head, \
+ condition, \
+ timeout); \
+ __ret; \
+})
+#endif
+#ifndef wait_event_idle_exclusive_timeout_cmd
+#define __wait_event_idle_exclusive_timeout_cmd(wq_head, condition, \
+ timeout, cmd1, cmd2) \
+ ___wait_event(wq_head, ___wait_cond_timeout1(condition), \
+ TASK_IDLE, 1, timeout, \
+ cmd1; __ret = schedule_timeout(__ret); cmd2)
+
+#define wait_event_idle_exclusive_timeout_cmd(wq_head, condition, timeout,\
+ cmd1, cmd2) \
+({ \
+ long __ret = timeout; \
+ if (!___wait_cond_timeout1(condition)) \
+ __ret = __wait_event_idle_exclusive_timeout_cmd( \
+ wq_head, condition, timeout, cmd1, cmd2); \
+ __ret; \
+})
+#endif
+
+#ifndef wait_event_idle_timeout
+
+#define __wait_event_idle_timeout(wq_head, condition, timeout) \
+ ___wait_event(wq_head, ___wait_cond_timeout1(condition), \
+ TASK_IDLE, 0, timeout, \
+ __ret = schedule_timeout(__ret))
+
+/**
+ * wait_event_idle_timeout - sleep without load until a condition becomes
+ * true or a timeout elapses
+ * @wq_head: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, in jiffies
+ *
+ * The process is put to sleep (TASK_IDLE) until the
+ * @condition evaluates to true. The @condition is checked each time
+ * the waitqueue @wq_head is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * Returns:
+ * 0 if the @condition evaluated to %false after the @timeout elapsed,
+ * 1 if the @condition evaluated to %true after the @timeout elapsed,
+ * or the remaining jiffies (at least 1) if the @condition evaluated
+ * to %true before the @timeout elapsed.
+ */
+#define wait_event_idle_timeout(wq_head, condition, timeout) \
+({ \
+ long __ret = timeout; \
+ might_sleep(); \
+ if (!___wait_cond_timeout1(condition)) \
+ __ret = __wait_event_idle_timeout(wq_head, condition, \
+ timeout); \
+ __ret; \
+})
+#endif
+#endif /* TASK_IDLE */
+
+/* ___wait_event_lifo is used for lifo exclusive 'idle' waits */
+#ifdef TASK_NOLOAD
+
+#define ___wait_event_lifo(wq_head, condition, ret, cmd) \
+({ \
+ wait_queue_entry_t __wq_entry; \
+ long __ret = ret; /* explicit shadow */ \
+ \
+ init_wait(&__wq_entry); \
+ __wq_entry.flags = WQ_FLAG_EXCLUSIVE; \
+ for (;;) { \
+ prepare_to_wait_exclusive_head(&wq_head, &__wq_entry); \
+ prepare_to_wait_event(&wq_head, &__wq_entry, TASK_IDLE);\
+ \
+ if (condition) \
+ break; \
+ \
+ cmd; \
+ } \
+ finish_wait(&wq_head, &__wq_entry); \
+ __ret; \
+})
+#else
+#define ___wait_event_lifo(wq_head, condition, ret, cmd) \
+({ \
+ wait_queue_entry_t __wq_entry; \
+ unsigned long flags; \
+ long __ret = ret; /* explicit shadow */ \
+ sigset_t __old_blocked, __new_blocked; \
+ \
+ siginitset(&__new_blocked, LUSTRE_FATAL_SIGS); \
+ sigprocmask(0, &__new_blocked, &__old_blocked); \
+ init_wait(&__wq_entry); \
+ __wq_entry.flags = WQ_FLAG_EXCLUSIVE; \
+ for (;;) { \
+ prepare_to_wait_exclusive_head(&wq_head, &__wq_entry); \
+ prepare_to_wait_event(&wq_head, &__wq_entry, \
+ TASK_INTERRUPTIBLE); \
+ \
+ if (condition) \
+ break; \
+ /* See justification in ___wait_event_idle */ \
+ if (signal_pending(current)) { \
+ spin_lock_irqsave(¤t->sighand->siglock, \
+ flags); \
+ clear_tsk_thread_flag(current, TIF_SIGPENDING); \
+ spin_unlock_irqrestore(¤t->sighand->siglock,\
+ flags); \
+ } \
+ cmd; \
+ } \
+ sigprocmask(SIG_SETMASK, &__old_blocked, NULL); \
+ finish_wait(&wq_head, &__wq_entry); \
+ __ret; \
+})
+#endif
+
+#define wait_event_idle_exclusive_lifo(wq_head, condition) \
+do { \
+ might_sleep(); \
+ if (!(condition)) \
+ ___wait_event_lifo(wq_head, condition, 0, schedule()); \
+} while (0)
+
+#define __wait_event_idle_lifo_timeout(wq_head, condition, timeout) \
+ ___wait_event_lifo(wq_head, ___wait_cond_timeout1(condition), \
+ timeout, \
+ __ret = schedule_timeout(__ret))
+
+#define wait_event_idle_exclusive_lifo_timeout(wq_head, condition, timeout)\
+({ \
+ long __ret = timeout; \
+ might_sleep(); \
+ if (!___wait_cond_timeout1(condition)) \
+ __ret = __wait_event_idle_lifo_timeout(wq_head, \
+ condition, \
+ timeout); \
+ __ret; \
+})
+
+/* l_wait_event_abortable() is a bit like wait_event_killable()
+ * except there is a fixed set of signals which will abort:
+ * LUSTRE_FATAL_SIGS
+ */
+#define LUSTRE_FATAL_SIGS \
+ (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGTERM) | \
+ sigmask(SIGQUIT) | sigmask(SIGALRM))
+
+#define l_wait_event_abortable(wq, condition) \
+({ \
+ sigset_t __new_blocked, __old_blocked; \
+ int __ret = 0; \
+ siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS); \
+ sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked); \
+ __ret = wait_event_interruptible(wq, condition); \
+ sigprocmask(SIG_SETMASK, &__old_blocked, NULL); \
+ __ret; \
+})
+
+#define l_wait_event_abortable_timeout(wq, condition, timeout) \
+({ \
+ sigset_t __new_blocked, __old_blocked; \
+ int __ret = 0; \
+ siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS); \
+ sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked); \
+ __ret = wait_event_interruptible_timeout(wq, condition, timeout);\
+ sigprocmask(SIG_SETMASK, &__old_blocked, NULL); \
+ __ret; \
+})
+
+#define l_wait_event_abortable_exclusive(wq, condition) \
+({ \
+ sigset_t __new_blocked, __old_blocked; \
+ int __ret = 0; \
+ siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS); \
+ sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked); \
+ __ret = wait_event_interruptible_exclusive(wq, condition); \
+ sigprocmask(SIG_SETMASK, &__old_blocked, NULL); \
+ __ret; \
+})
+
#endif /* __LICBFS_LINUX_WAIT_BIT_H */
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