/* page.c */
+#define CB_PHASE_START 12
+#define CB_PHASE_FINISH 13
+
+/*
+ * io_cb_data: io callback data merged into one struct to simplify
+ * memory managment. This may be turn out to be too simple.
+ */
+struct io_cb_data;
+typedef int (*brw_callback_t)(struct io_cb_data *, int err, int phase);
+
+struct io_cb_data {
+ wait_queue_head_t waitq;
+ atomic_t refcount;
+ int complete;
+ int err;
+ struct ptlrpc_bulk_desc *desc;
+ brw_callback_t cb;
+};
+
+int ll_sync_io_cb(struct io_cb_data *data, int err, int phase);
+struct io_cb_data *ll_init_cb(void);
inline void lustre_put_page(struct page *page);
struct page *lustre_get_page_read(struct inode *dir, unsigned long index);
struct page *lustre_get_page_write(struct inode *dir, unsigned long index);
struct obd_run_ctxt;
void push_ctxt(struct obd_run_ctxt *save, struct obd_run_ctxt *new);
void pop_ctxt(struct obd_run_ctxt *saved);
-#ifdef OBD_CTXT_DEBUG
-#define OBD_SET_CTXT_MAGIC(ctxt) (ctxt)->magic = OBD_RUN_CTXT_MAGIC
-#else
-#define OBD_SET_CTXT_MAGIC(ctxt) do {} while(0)
-#endif
struct dentry *simple_mkdir(struct dentry *dir, char *name, int mode);
int lustre_fread(struct file *file, char *str, int len, loff_t *off);
int lustre_fwrite(struct file *file, const char *str, int len, loff_t *off);
#define OBD_IOC_DEC_FS_USE_COUNT _IO ('f', 133 )
+/*
+ * l_wait_event is a flexible sleeping function, permitting simple caller
+ * configuration of interrupt and timeout sensitivity along with actions to
+ * be performed in the event of either exception.
+ *
+ * Common usage looks like this:
+ *
+ * struct l_wait_info lwi = LWI_TIMEOUT_INTR(timeout, timeout_handler,
+ * intr_handler, callback_data);
+ * rc = l_wait_event(waitq, condition, &lwi);
+ *
+ * (LWI_TIMEOUT and LWI_INTR macros are available for timeout- and
+ * interrupt-only variants, respectively.)
+ *
+ * If a timeout is specified, the timeout_handler will be invoked in the event
+ * that the timeout expires before the process is awakened. (Note that any
+ * waking of the process will restart the timeout, even if the condition is
+ * not satisfied and the process immediately returns to sleep. This might be
+ * considered a bug.) If the timeout_handler returns non-zero, l_wait_event
+ * will return -ETIMEDOUT and the caller will continue. If the handler returns
+ * zero instead, the process will go back to sleep until it is awakened by the
+ * waitq or some similar mechanism, or an interrupt occurs (if the caller has
+ * asked for interrupts to be detected). The timeout will only fire once, so
+ * callers should take care that a timeout_handler which returns zero will take
+ * future steps to awaken the process. N.B. that these steps must include making
+ * the provided condition become true.
+ *
+ * If the interrupt flag (lwi_signals) is non-zero, then the process will be
+ * interruptible, and will be awakened by any "killable" signal (SIGTERM,
+ * SIGKILL or SIGINT). If a timeout is also specified, then the process will
+ * only become interruptible _after_ the timeout has expired, though it can be
+ * awakened by a signal that was delivered before the timeout and is still
+ * pending when the timeout expires. If a timeout is not specified, the process
+ * will be interruptible at all times during l_wait_event.
+ */
+struct l_wait_info {
+ long lwi_timeout;
+ int (*lwi_on_timeout)(void *);
+ long lwi_signals;
+ int (*lwi_on_signal)(void *); /* XXX return is ignored for now */
+ void *lwi_cb_data;
+};
+#define LWI_TIMEOUT(time, cb, data) \
+((struct l_wait_info) { \
+ lwi_timeout: time, \
+ lwi_on_timeout: cb, \
+ lwi_cb_data: data \
+})
+#define LWI_INTR(cb, data) \
+((struct l_wait_info) { \
+ lwi_signals: 1, \
+ lwi_on_signal: cb, \
+ lwi_cb_data: data \
+})
+
+#define LWI_TIMEOUT_INTR(time, time_cb, sig_cb, data) \
+((struct l_wait_info) { \
+ lwi_timeout: time, \
+ lwi_on_timeout: time_cb, \
+ lwi_signals: 1, \
+ lwi_on_signal: sig_cb, \
+ lwi_cb_data: data \
+})
/* XXX this should be one mask-check */
-#define l_killable_pending(task) \
-(sigismember(&(task->pending.signal), SIGKILL) || \
- sigismember(&(task->pending.signal), SIGINT) || \
+#define l_killable_pending(task) \
+(sigismember(&(task->pending.signal), SIGKILL) || \
+ sigismember(&(task->pending.signal), SIGINT) || \
sigismember(&(task->pending.signal), SIGTERM))
-/*
- * Like wait_event_interruptible, but we're only interruptible by KILL, INT, or
- * TERM.
- *
- * XXXshaver These are going away soon, I hope.
- */
-#define __l_wait_event_killable(wq, condition, ret) \
-do { \
- wait_queue_t __wait; \
- init_waitqueue_entry(&__wait, current); \
- \
- add_wait_queue(&wq, &__wait); \
- for (;;) { \
- set_current_state(TASK_INTERRUPTIBLE); \
- if (condition) \
- break; \
- if (!signal_pending(current) || \
- !l_killable_pending(current)) { \
- schedule(); \
- continue; \
- } \
- ret = -ERESTARTSYS; \
- break; \
- } \
- current->state = TASK_RUNNING; \
- remove_wait_queue(&wq, &__wait); \
-} while(0)
-
-#define l_wait_event_killable(wq, condition) \
-({ \
- int __ret = 0; \
- if (!(condition)) \
- __l_wait_event_killable(wq, condition, __ret); \
- __ret; \
-})
-
-#define __l_wait_event_timeout(wq, condition, timeout, ret) \
-do { \
- wait_queue_t __wait; \
- init_waitqueue_entry(&__wait, current); \
- \
- add_wait_queue(&wq, &__wait); \
- for (;;) { \
- set_current_state(TASK_INTERRUPTIBLE); \
- if (condition) \
- break; \
- if (timeout) \
- schedule_timeout(timeout); \
- else \
- schedule(); \
- } \
- current->state = TASK_RUNNING; \
- remove_wait_queue(&wq, &__wait); \
+#define __l_wait_event(wq, condition, info, ret) \
+do { \
+ wait_queue_t __wait; \
+ long __state; \
+ int __timed_out = 0; \
+ init_waitqueue_entry(&__wait, current); \
+ \
+ add_wait_queue(&wq, &__wait); \
+ if (info->lwi_signals && !info->lwi_timeout) \
+ __state = TASK_INTERRUPTIBLE; \
+ else \
+ __state = TASK_UNINTERRUPTIBLE; \
+ for (;;) { \
+ set_current_state(__state); \
+ if (condition) \
+ break; \
+ if (__state == TASK_INTERRUPTIBLE && l_killable_pending(current)) { \
+ CERROR("lwe: interrupt\n"); \
+ if (info->lwi_on_signal) \
+ info->lwi_on_signal(info->lwi_cb_data); \
+ ret = -EINTR; \
+ break; \
+ } \
+ if (info->lwi_timeout && !__timed_out) { \
+ if (schedule_timeout(info->lwi_timeout) == 0) { \
+ CERROR("lwe: timeout\n"); \
+ __timed_out = 1; \
+ if (!info->lwi_on_timeout || \
+ info->lwi_on_timeout(info->lwi_cb_data)) { \
+ ret = -ETIMEDOUT; \
+ break; \
+ } \
+ /* We'll take signals after a timeout. */ \
+ if (info->lwi_signals) { \
+ __state = TASK_INTERRUPTIBLE; \
+ /* Check for a pending interrupt. */ \
+ if (info->lwi_signals && l_killable_pending(current)) { \
+ CERROR("lwe: pending interrupt\n"); \
+ if (info->lwi_on_signal) \
+ info->lwi_on_signal(info->lwi_cb_data); \
+ ret = -EINTR; \
+ break; \
+ } \
+ } \
+ } \
+ } else { \
+ schedule(); \
+ } \
+ } \
+ current->state = TASK_RUNNING; \
+ remove_wait_queue(&wq, &__wait); \
} while(0)
-#define l_wait_event_timeout(wq, condition, timeout) \
-({ \
- int __ret = 0; \
- if (!(condition)) \
- __l_wait_event_timeout(wq, condition, timeout, __ret); \
- __ret; \
+#define l_wait_event(wq, condition, info) \
+({ \
+ int __ret = 0; \
+ struct l_wait_info *__info = (info); \
+ if (!(condition)) \
+ __l_wait_event(wq, condition, __info, __ret); \
+ __ret; \
})
#endif /* _LUSTRE_LIB_H */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff