static int shmem_radix_tree_replace(struct address_space *mapping,
pgoff_t index, void *expected, void *replacement)
{
+ struct radix_tree_node *node;
void **pslot;
void *item;
VM_BUG_ON(!expected);
VM_BUG_ON(!replacement);
- pslot = radix_tree_lookup_slot(&mapping->page_tree, index);
- if (!pslot)
+ item = __radix_tree_lookup(&mapping->page_tree, index, &node, &pslot);
+ if (!item)
return -ENOENT;
- item = radix_tree_deref_slot_protected(pslot, &mapping->tree_lock);
if (item != expected)
return -ENOENT;
- radix_tree_replace_slot(pslot, replacement);
+ __radix_tree_replace(&mapping->page_tree, node, pslot,
+ replacement, NULL, NULL);
return 0;
}
int shmem_huge __read_mostly;
+#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
static int shmem_parse_huge(const char *str)
{
if (!strcmp(str, "never"))
return "bad_val";
}
}
+#endif
static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
struct shrink_control *sc, unsigned long nr_to_split)
swapped++;
if (need_resched()) {
+ slot = radix_tree_iter_resume(slot, &iter);
cond_resched_rcu();
- slot = radix_tree_iter_next(&iter);
}
}
struct mm_struct *fault_mm, int *fault_type)
{
struct address_space *mapping = inode->i_mapping;
- struct shmem_inode_info *info;
+ struct shmem_inode_info *info = SHMEM_I(inode);
struct shmem_sb_info *sbinfo;
struct mm_struct *charge_mm;
struct mem_cgroup *memcg;
* Fast cache lookup did not find it:
* bring it back from swap or allocate.
*/
- info = SHMEM_I(inode);
sbinfo = SHMEM_SB(inode->i_sb);
charge_mm = fault_mm ? : current->mm;
put_page(page);
}
if (error == -ENOSPC && !once++) {
- info = SHMEM_I(inode);
spin_lock_irq(&info->lock);
shmem_recalc_inode(inode);
spin_unlock_irq(&info->lock);
return error;
}
+/*
+ * This is like autoremove_wake_function, but it removes the wait queue
+ * entry unconditionally - even if something else had already woken the
+ * target.
+ */
+static int synchronous_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key)
+{
+ int ret = default_wake_function(wait, mode, sync, key);
+ list_del_init(&wait->task_list);
+ return ret;
+}
+
static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct inode *inode = file_inode(vma->vm_file);
vmf->pgoff >= shmem_falloc->start &&
vmf->pgoff < shmem_falloc->next) {
wait_queue_head_t *shmem_falloc_waitq;
- DEFINE_WAIT(shmem_fault_wait);
+ DEFINE_WAIT_FUNC(shmem_fault_wait, synchronous_wake_function);
ret = VM_FAULT_NOPAGE;
if ((vmf->flags & FAULT_FLAG_ALLOW_RETRY) &&
}
if (need_resched()) {
+ slot = radix_tree_iter_resume(slot, &iter);
cond_resched_rcu();
- slot = radix_tree_iter_next(&iter);
}
}
rcu_read_unlock();
spin_unlock_irq(&mapping->tree_lock);
continue_resched:
if (need_resched()) {
+ slot = radix_tree_iter_resume(slot, &iter);
cond_resched_rcu();
- slot = radix_tree_iter_next(&iter);
}
}
rcu_read_unlock();
spin_lock(&inode->i_lock);
inode->i_private = NULL;
wake_up_all(&shmem_falloc_waitq);
+ WARN_ON_ONCE(!list_empty(&shmem_falloc_waitq.task_list));
spin_unlock(&inode->i_lock);
error = 0;
goto out;