return 0;
}
+/*
+ * wait for an object to become active (or dead)
+ */
+static int fscache_wait_for_retrieval_activation(struct fscache_object *object,
+ struct fscache_retrieval *op,
+ atomic_t *stat_op_waits,
+ atomic_t *stat_object_dead)
+{
+ int ret;
+
+ if (!test_bit(FSCACHE_OP_WAITING, &op->op.flags))
+ goto check_if_dead;
+
+ _debug(">>> WT");
+ fscache_stat(stat_op_waits);
+ if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
+ fscache_wait_bit_interruptible,
+ TASK_INTERRUPTIBLE) < 0) {
+ ret = fscache_cancel_op(&op->op);
+ if (ret == 0)
+ return -ERESTARTSYS;
+
+ /* it's been removed from the pending queue by another party,
+ * so we should get to run shortly */
+ wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
+ fscache_wait_bit, TASK_UNINTERRUPTIBLE);
+ }
+ _debug("<<< GO");
+
+check_if_dead:
+ if (unlikely(fscache_object_is_dead(object))) {
+ fscache_stat(stat_object_dead);
+ return -ENOBUFS;
+ }
+ return 0;
+}
+
/*
* read a page from the cache or allocate a block in which to store it
* - we return:
/* we wait for the operation to become active, and then process it
* *here*, in this thread, and not in the thread pool */
- if (test_bit(FSCACHE_OP_WAITING, &op->op.flags)) {
- _debug(">>> WT");
- fscache_stat(&fscache_n_retrieval_op_waits);
- if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit_interruptible,
- TASK_INTERRUPTIBLE) < 0) {
- ret = fscache_cancel_op(&op->op);
- if (ret == 0) {
- ret = -ERESTARTSYS;
- goto error;
- }
-
- /* it's been removed from the pending queue by another
- * party, so we should get to run shortly */
- wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit, TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
- }
+ ret = fscache_wait_for_retrieval_activation(
+ object, op,
+ __fscache_stat(&fscache_n_retrieval_op_waits),
+ __fscache_stat(&fscache_n_retrievals_object_dead));
+ if (ret < 0)
+ goto error;
/* ask the cache to honour the operation */
if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) {
/* we wait for the operation to become active, and then process it
* *here*, in this thread, and not in the thread pool */
- if (test_bit(FSCACHE_OP_WAITING, &op->op.flags)) {
- _debug(">>> WT");
- fscache_stat(&fscache_n_retrieval_op_waits);
- if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit_interruptible,
- TASK_INTERRUPTIBLE) < 0) {
- ret = fscache_cancel_op(&op->op);
- if (ret == 0) {
- ret = -ERESTARTSYS;
- goto error;
- }
-
- /* it's been removed from the pending queue by another
- * party, so we should get to run shortly */
- wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit, TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
- }
+ ret = fscache_wait_for_retrieval_activation(
+ object, op,
+ __fscache_stat(&fscache_n_retrieval_op_waits),
+ __fscache_stat(&fscache_n_retrievals_object_dead));
+ if (ret < 0)
+ goto error;
/* ask the cache to honour the operation */
if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) {
fscache_stat(&fscache_n_alloc_ops);
- if (test_bit(FSCACHE_OP_WAITING, &op->op.flags)) {
- _debug(">>> WT");
- fscache_stat(&fscache_n_alloc_op_waits);
- if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit_interruptible,
- TASK_INTERRUPTIBLE) < 0) {
- ret = fscache_cancel_op(&op->op);
- if (ret == 0) {
- ret = -ERESTARTSYS;
- goto error;
- }
-
- /* it's been removed from the pending queue by another
- * party, so we should get to run shortly */
- wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
- fscache_wait_bit, TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
- }
+ ret = fscache_wait_for_retrieval_activation(
+ object, op,
+ __fscache_stat(&fscache_n_alloc_op_waits),
+ __fscache_stat(&fscache_n_allocs_object_dead));
+ if (ret < 0)
+ goto error;
/* ask the cache to honour the operation */
fscache_stat(&fscache_n_cop_allocate_page);