#include <linux/list.h>
#include <linux/highmem.h>
#include <linux/compiler.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <linux/gfp.h>
#include <linux/bitops.h>
#include <linux/hardirq.h> /* for in_interrupt() */
#include <linux/hugetlb_inline.h>
/*
- * Bits in mapping->flags. The lower __GFP_BITS_SHIFT bits are the page
- * allocation mode flags.
+ * Bits in mapping->flags.
*/
enum mapping_flags {
- AS_EIO = __GFP_BITS_SHIFT + 0, /* IO error on async write */
- AS_ENOSPC = __GFP_BITS_SHIFT + 1, /* ENOSPC on async write */
- AS_MM_ALL_LOCKS = __GFP_BITS_SHIFT + 2, /* under mm_take_all_locks() */
- AS_UNEVICTABLE = __GFP_BITS_SHIFT + 3, /* e.g., ramdisk, SHM_LOCK */
- AS_EXITING = __GFP_BITS_SHIFT + 4, /* final truncate in progress */
+ AS_EIO = 0, /* IO error on async write */
+ AS_ENOSPC = 1, /* ENOSPC on async write */
+ AS_MM_ALL_LOCKS = 2, /* under mm_take_all_locks() */
+ AS_UNEVICTABLE = 3, /* e.g., ramdisk, SHM_LOCK */
+ AS_EXITING = 4, /* final truncate in progress */
+ /* writeback related tags are not used */
+ AS_NO_WRITEBACK_TAGS = 5,
};
static inline void mapping_set_error(struct address_space *mapping, int error)
return test_bit(AS_EXITING, &mapping->flags);
}
+static inline void mapping_set_no_writeback_tags(struct address_space *mapping)
+{
+ set_bit(AS_NO_WRITEBACK_TAGS, &mapping->flags);
+}
+
+static inline int mapping_use_writeback_tags(struct address_space *mapping)
+{
+ return !test_bit(AS_NO_WRITEBACK_TAGS, &mapping->flags);
+}
+
static inline gfp_t mapping_gfp_mask(struct address_space * mapping)
{
- return (__force gfp_t)mapping->flags & __GFP_BITS_MASK;
+ return mapping->gfp_mask;
}
/* Restricts the given gfp_mask to what the mapping allows. */
*/
static inline void mapping_set_gfp_mask(struct address_space *m, gfp_t mask)
{
- m->flags = (m->flags & ~(__force unsigned long)__GFP_BITS_MASK) |
- (__force unsigned long)mask;
+ m->gfp_mask = mask;
}
void release_pages(struct page **pages, int nr, bool cold);
}
/*
- * Get the offset in PAGE_SIZE.
- * (TODO: hugepage should have ->index in PAGE_SIZE)
+ * Get index of the page with in radix-tree
+ * (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE)
*/
-static inline pgoff_t page_to_pgoff(struct page *page)
+static inline pgoff_t page_to_index(struct page *page)
{
pgoff_t pgoff;
- if (unlikely(PageHeadHuge(page)))
- return page->index << compound_order(page);
-
if (likely(!PageTransTail(page)))
return page->index;
return pgoff;
}
+/*
+ * Get the offset in PAGE_SIZE.
+ * (TODO: hugepage should have ->index in PAGE_SIZE)
+ */
+static inline pgoff_t page_to_pgoff(struct page *page)
+{
+ if (unlikely(PageHeadHuge(page)))
+ return page->index << compound_order(page);
+
+ return page_to_index(page);
+}
+
/*
* Return byte-offset into filesystem object for page.
*/
static inline loff_t page_file_offset(struct page *page)
{
- return ((loff_t)page_file_index(page)) << PAGE_SHIFT;
+ return ((loff_t)page_index(page)) << PAGE_SHIFT;
}
extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
* and for filesystems which need to wait on PG_private.
*/
extern void wait_on_page_bit(struct page *page, int bit_nr);
-
extern int wait_on_page_bit_killable(struct page *page, int bit_nr);
-extern int wait_on_page_bit_killable_timeout(struct page *page,
- int bit_nr, unsigned long timeout);
+extern void wake_up_page_bit(struct page *page, int bit_nr);
-static inline int wait_on_page_locked_killable(struct page *page)
-{
- if (!PageLocked(page))
- return 0;
- return wait_on_page_bit_killable(compound_head(page), PG_locked);
-}
-
-extern wait_queue_head_t *page_waitqueue(struct page *page);
static inline void wake_up_page(struct page *page, int bit)
{
- __wake_up_bit(page_waitqueue(page), &page->flags, bit);
+ if (!PageWaiters(page))
+ return;
+ wake_up_page_bit(page, bit);
}
/*
wait_on_page_bit(compound_head(page), PG_locked);
}
+static inline int wait_on_page_locked_killable(struct page *page)
+{
+ if (!PageLocked(page))
+ return 0;
+ return wait_on_page_bit_killable(compound_head(page), PG_locked);
+}
+
/*
* Wait for a page to complete writeback
*/
extern void add_page_wait_queue(struct page *page, wait_queue_t *waiter);
/*
- * Fault one or two userspace pages into pagetables.
- * Return -EINVAL if more than two pages would be needed.
- * Return non-zero on a fault.
+ * Fault everything in given userspace address range in.
*/
static inline int fault_in_pages_writeable(char __user *uaddr, int size)
-{
- int span, ret;
-
- if (unlikely(size == 0))
- return 0;
-
- span = offset_in_page(uaddr) + size;
- if (span > 2 * PAGE_SIZE)
- return -EINVAL;
- /*
- * Writing zeroes into userspace here is OK, because we know that if
- * the zero gets there, we'll be overwriting it.
- */
- ret = __put_user(0, uaddr);
- if (ret == 0 && span > PAGE_SIZE)
- ret = __put_user(0, uaddr + size - 1);
- return ret;
-}
-
-static inline int fault_in_pages_readable(const char __user *uaddr, int size)
-{
- volatile char c;
- int ret;
-
- if (unlikely(size == 0))
- return 0;
-
- ret = __get_user(c, uaddr);
- if (ret == 0) {
- const char __user *end = uaddr + size - 1;
-
- if (((unsigned long)uaddr & PAGE_MASK) !=
- ((unsigned long)end & PAGE_MASK)) {
- ret = __get_user(c, end);
- (void)c;
- }
- }
- return ret;
-}
-
-/*
- * Multipage variants of the above prefault helpers, useful if more than
- * PAGE_SIZE of data needs to be prefaulted. These are separate from the above
- * functions (which only handle up to PAGE_SIZE) to avoid clobbering the
- * filemap.c hotpaths.
- */
-static inline int fault_in_multipages_writeable(char __user *uaddr, int size)
{
char __user *end = uaddr + size - 1;
return 0;
}
-static inline int fault_in_multipages_readable(const char __user *uaddr,
- int size)
+static inline int fault_in_pages_readable(const char __user *uaddr, int size)
{
volatile char c;
const char __user *end = uaddr + size - 1;