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-rw-r--r--mm/filemap.c16
-rw-r--r--mm/memory.c10
2 files changed, 23 insertions, 3 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 8ed709a..33f8125 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -612,6 +612,19 @@ void __lock_page_nosync(struct page *page)
TASK_UNINTERRUPTIBLE);
}
+int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
+ unsigned int flags)
+{
+ if (!(flags & FAULT_FLAG_ALLOW_RETRY)) {
+ __lock_page(page);
+ return 1;
+ } else {
+ up_read(&mm->mmap_sem);
+ wait_on_page_locked(page);
+ return 0;
+ }
+}
+
/**
* find_get_page - find and get a page reference
* @mapping: the address_space to search
@@ -1550,7 +1563,8 @@ retry_find:
goto no_cached_page;
}
- lock_page(page);
+ if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags))
+ return ret | VM_FAULT_RETRY;
/* Did it get truncated? */
if (unlikely(page->mapping != mapping)) {
diff --git a/mm/memory.c b/mm/memory.c
index 92cc54e..714c443 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2627,6 +2627,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page *page, *swapcache = NULL;
swp_entry_t entry;
pte_t pte;
+ int locked;
struct mem_cgroup *ptr = NULL;
int exclusive = 0;
int ret = 0;
@@ -2677,8 +2678,12 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto out_release;
}
- lock_page(page);
+ locked = lock_page_or_retry(page, mm, flags);
delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
+ if (!locked) {
+ ret |= VM_FAULT_RETRY;
+ goto out_release;
+ }
/*
* Make sure try_to_free_swap or reuse_swap_page or swapoff did not
@@ -2927,7 +2932,8 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
vmf.page = NULL;
ret = vma->vm_ops->fault(vma, &vmf);
- if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
+ if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE |
+ VM_FAULT_RETRY)))
return ret;
if (unlikely(PageHWPoison(vmf.page))) {
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