@@ -259,6 +259,33 @@ void btrfs_subpage_clear_dirty(const struct btrfs_fs_info *fs_info,
clear_page_dirty_for_io(page);
}
+void btrfs_subpage_set_writeback(const 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->writeback_bitmap |= tmp;
+ set_page_writeback(page);
+ spin_unlock_irqrestore(&subpage->lock, flags);
+}
+
+void btrfs_subpage_clear_writeback(const 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->writeback_bitmap &= ~tmp;
+ if (subpage->writeback_bitmap == 0)
+ end_page_writeback(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.
@@ -280,6 +307,7 @@ bool btrfs_subpage_test_##name(const struct btrfs_fs_info *fs_info, \
IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(uptodate);
IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(error);
IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(dirty);
+IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(writeback);
/*
* Note that, in selftests (extent-io-tests), we can have empty fs_info passed
@@ -318,3 +346,5 @@ IMPLEMENT_BTRFS_PAGE_OPS(uptodate, SetPageUptodate, ClearPageUptodate,
IMPLEMENT_BTRFS_PAGE_OPS(error, SetPageError, ClearPageError, PageError);
IMPLEMENT_BTRFS_PAGE_OPS(dirty, set_page_dirty, clear_page_dirty_for_io,
PageDirty);
+IMPLEMENT_BTRFS_PAGE_OPS(writeback, set_page_writeback, end_page_writeback,
+ PageWriteback);
@@ -21,6 +21,7 @@ struct btrfs_subpage {
u16 uptodate_bitmap;
u16 error_bitmap;
u16 dirty_bitmap;
+ u16 writeback_bitmap;
union {
/*
* Structures only used by metadata
@@ -89,6 +90,7 @@ bool btrfs_page_test_##name(const struct btrfs_fs_info *fs_info, \
DECLARE_BTRFS_SUBPAGE_OPS(uptodate);
DECLARE_BTRFS_SUBPAGE_OPS(error);
DECLARE_BTRFS_SUBPAGE_OPS(dirty);
+DECLARE_BTRFS_SUBPAGE_OPS(writeback);
/*
* Extra clear_and_test function for subpage dirty bitmap.
This patch introduce the following functions to handle btrfs subpage writeback status: - btrfs_subpage_set_writeback() - btrfs_subpage_clear_writeback() - btrfs_subpage_test_writeback() Those helpers can only be called when the range is ensured to be inside the page. - btrfs_page_set_writeback() - btrfs_page_clear_writeback() - btrfs_page_test_writeback() Those helpers can handle both regular sector size and subpage without problem. Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/subpage.c | 30 ++++++++++++++++++++++++++++++ fs/btrfs/subpage.h | 2 ++ 2 files changed, 32 insertions(+)