[PATCH v2 05/15] btrfs: introduce helpers for subpage writeback status
From: Qu Wenruo <hidden>
Date: 2021-03-10 09:09:51
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
This patch introduces 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 <redacted> --- fs/btrfs/subpage.c | 30 ++++++++++++++++++++++++++++++ fs/btrfs/subpage.h | 2 ++ 2 files changed, 32 insertions(+)
diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c
index 183925902031..2a326d6385ed 100644
--- a/fs/btrfs/subpage.c
+++ b/fs/btrfs/subpage.c@@ -260,6 +260,33 @@ 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.
@@ -281,6 +308,7 @@ 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
@@ -319,3 +347,5 @@ 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);
diff --git a/fs/btrfs/subpage.h b/fs/btrfs/subpage.h
index adaece5ce294..fe43267e31f3 100644
--- a/fs/btrfs/subpage.h
+++ b/fs/btrfs/subpage.h@@ -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.
--
2.30.1