@@ -23,6 +23,7 @@
struct btrfs_subpage {
/* Common members for both data and metadata pages */
spinlock_t lock;
+ u16 uptodate_bitmap;
union {
/* Structures only used by metadata */
struct {
@@ -102,4 +103,87 @@ static inline bool btrfs_subpage_clear_and_test_tree_block(
return last;
}
+static inline void btrfs_subpage_set_uptodate(struct btrfs_fs_info *fs_info,
+ struct page *page, u64 start, u32 len)
+{
+ struct btrfs_subpage *subpage = (struct btrfs_subpage *)page->private;
+ u16 tmp = btrfs_subpage_calc_bitmap(fs_info, page, start, len);
+ unsigned long flags;
+
+ spin_lock_irqsave(&subpage->lock, flags);
+ subpage->uptodate_bitmap |= tmp;
+ if (subpage->uptodate_bitmap == U16_MAX)
+ SetPageUptodate(page);
+ spin_unlock_irqrestore(&subpage->lock, flags);
+}
+
+static inline void btrfs_subpage_clear_uptodate(struct btrfs_fs_info *fs_info,
+ struct page *page, u64 start, u32 len)
+{
+ struct btrfs_subpage *subpage = (struct btrfs_subpage *)page->private;
+ u16 tmp = btrfs_subpage_calc_bitmap(fs_info, page, start, len);
+ unsigned long flags;
+
+ spin_lock_irqsave(&subpage->lock, flags);
+ subpage->uptodate_bitmap &= ~tmp;
+ ClearPageUptodate(page);
+ spin_unlock_irqrestore(&subpage->lock, flags);
+}
+
+/*
+ * Unlike set/clear which is dependent on each page status, for test all bits
+ * are tested in the same way.
+ */
+#define DECLARE_BTRFS_SUBPAGE_TEST_OP(name) \
+static inline bool btrfs_subpage_test_##name(struct btrfs_fs_info *fs_info, \
+ struct page *page, u64 start, u32 len) \
+{ \
+ struct btrfs_subpage *subpage = (struct btrfs_subpage *)page->private; \
+ u16 tmp = btrfs_subpage_calc_bitmap(fs_info, page, start, len); \
+ unsigned long flags; \
+ bool ret; \
+ \
+ spin_lock_irqsave(&subpage->lock, flags); \
+ ret = ((subpage->name##_bitmap & tmp) == tmp); \
+ spin_unlock_irqrestore(&subpage->lock, flags); \
+ return ret; \
+}
+DECLARE_BTRFS_SUBPAGE_TEST_OP(uptodate);
+
+/*
+ * Note that, in selftest, especially extent-io-tests, we can have empty
+ * fs_info passed in.
+ * Thankfully in selftest, we only test sectorsize == PAGE_SIZE cases so far,
+ * thus we can fall back to regular sectorsize branch.
+ */
+#define DECLARE_BTRFS_PAGE_OPS(name, set_page_func, clear_page_func, \
+ test_page_func) \
+static inline void btrfs_page_set_##name(struct btrfs_fs_info *fs_info, \
+ struct page *page, u64 start, u32 len) \
+{ \
+ if (unlikely(!fs_info) || fs_info->sectorsize == PAGE_SIZE) { \
+ set_page_func(page); \
+ return; \
+ } \
+ btrfs_subpage_set_##name(fs_info, page, start, len); \
+} \
+static inline void btrfs_page_clear_##name(struct btrfs_fs_info *fs_info, \
+ struct page *page, u64 start, u32 len) \
+{ \
+ if (unlikely(!fs_info) || fs_info->sectorsize == PAGE_SIZE) { \
+ clear_page_func(page); \
+ return; \
+ } \
+ btrfs_subpage_clear_##name(fs_info, page, start, len); \
+} \
+static inline bool btrfs_page_test_##name(struct btrfs_fs_info *fs_info, \
+ struct page *page, u64 start, u32 len) \
+{ \
+ if (unlikely(!fs_info) || fs_info->sectorsize == PAGE_SIZE) \
+ return test_page_func(page); \
+ return btrfs_subpage_test_##name(fs_info, page, start, len); \
+}
+DECLARE_BTRFS_PAGE_OPS(uptodate, SetPageUptodate, ClearPageUptodate,
+ PageUptodate);
+
#endif /* BTRFS_SUBPAGE_H */
This patch introduce the following functions to handle btrfs subpage uptodate status: - btrfs_subpage_set_uptodate() - btrfs_subpage_clear_uptodate() - btrfs_subpage_test_uptodate() Those helpers can only be called when the range is ensured to be inside the page. - btrfs_page_set_uptodate() - btrfs_page_clear_uptodate() - btrfs_page_test_uptodate() Those helpers can handle both regular sector size and subpage without problem. Although caller should still ensure that the range is inside the page. Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/subpage.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+)