}
EXPORT_SYMBOL(delete_from_page_cache);
-static int sleep_on_page(void *word)
-{
- io_schedule();
- return 0;
-}
-
-static int sleep_on_page_killable(void *word)
-{
- sleep_on_page(word);
- return fatal_signal_pending(current) ? -EINTR : 0;
-}
-
static int filemap_check_errors(struct address_space *mapping)
{
int ret = 0;
DEFINE_WAIT_BIT(wait, &page->flags, bit_nr);
if (test_bit(bit_nr, &page->flags))
- __wait_on_bit(page_waitqueue(page), &wait, sleep_on_page,
+ __wait_on_bit(page_waitqueue(page), &wait, bit_wait_io,
TASK_UNINTERRUPTIBLE);
}
EXPORT_SYMBOL(wait_on_page_bit);
return 0;
return __wait_on_bit(page_waitqueue(page), &wait,
- sleep_on_page_killable, TASK_KILLABLE);
+ bit_wait_io, TASK_KILLABLE);
}
/**
{
DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
- __wait_on_bit_lock(page_waitqueue(page), &wait, sleep_on_page,
+ __wait_on_bit_lock(page_waitqueue(page), &wait, bit_wait_io,
TASK_UNINTERRUPTIBLE);
}
EXPORT_SYMBOL(__lock_page);
DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
return __wait_on_bit_lock(page_waitqueue(page), &wait,
- sleep_on_page_killable, TASK_KILLABLE);
+ bit_wait_io, TASK_KILLABLE);
}
EXPORT_SYMBOL_GPL(__lock_page_killable);
+/*
+ * Return values:
+ * 1 - page is locked; mmap_sem is still held.
+ * 0 - page is not locked.
+ * mmap_sem has been released (up_read()), unless flags had both
+ * FAULT_FLAG_ALLOW_RETRY and FAULT_FLAG_RETRY_NOWAIT set, in
+ * which case mmap_sem is still held.
+ *
+ * If neither ALLOW_RETRY nor KILLABLE are set, will always return 1
+ * with the page locked and the mmap_sem unperturbed.
+ */
int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
unsigned int flags)
{
if (WARN_ON_ONCE(!(fgp_flags & FGP_LOCK)))
fgp_flags |= FGP_LOCK;
- /* Init accessed so avoit atomic mark_page_accessed later */
+ /* Init accessed so avoid atomic mark_page_accessed later */
if (fgp_flags & FGP_ACCESSED)
- init_page_accessed(page);
+ __SetPageReferenced(page);
err = add_to_page_cache_lru(page, mapping, offset, radix_gfp_mask);
if (unlikely(err)) {
* The goto's are kind of ugly, but this streamlines the normal case of having
* it in the page cache, and handles the special cases reasonably without
* having a lot of duplicated code.
+ *
+ * vma->vm_mm->mmap_sem must be held on entry.
+ *
+ * If our return value has VM_FAULT_RETRY set, it's because
+ * lock_page_or_retry() returned 0.
+ * The mmap_sem has usually been released in this case.
+ * See __lock_page_or_retry() for the exception.
+ *
+ * If our return value does not have VM_FAULT_RETRY set, the mmap_sem
+ * has not been released.
+ *
+ * We never return with VM_FAULT_RETRY and a bit from VM_FAULT_ERROR set.
*/
int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{