From 6f17400bd92e82ad549ea5374ffc71e35e2e4ee5 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Mon, 31 May 2021 16:50:45 +0800 Subject: [PATCH] btrfs: introduce helpers for subpage ordered status This patch introduces the following functions to handle btrfs subpage ordered (Private2) status: - btrfs_subpage_set_ordered() - btrfs_subpage_clear_ordered() - btrfs_subpage_test_ordered() These helpers can only be called when the range is ensured to be inside the page. - btrfs_page_set_ordered() - btrfs_page_clear_ordered() - btrfs_page_test_ordered() These helpers can handle both regular sector size and subpage without problem. These functions are here to coordinate btrfs_invalidatepage() with btrfs_writepage_endio_finish_ordered(), to make sure only one of those functions can finish the ordered extent. Tested-by: Ritesh Harjani # [ppc64] Tested-by: Anand Jain # [aarch64] Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/subpage.c | 29 +++++++++++++++++++++++++++++ fs/btrfs/subpage.h | 4 ++++ 2 files changed, 33 insertions(+) diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c index 69a0dbf35362..7d72eaf5f972 100644 --- a/fs/btrfs/subpage.c +++ b/fs/btrfs/subpage.c @@ -429,6 +429,32 @@ void btrfs_subpage_clear_writeback(const struct btrfs_fs_info *fs_info, spin_unlock_irqrestore(&subpage->lock, flags); } +void btrfs_subpage_set_ordered(const struct btrfs_fs_info *fs_info, + struct page *page, u64 start, u32 len) +{ + struct btrfs_subpage *subpage = (struct btrfs_subpage *)page->private; + const u16 tmp = btrfs_subpage_calc_bitmap(fs_info, page, start, len); + unsigned long flags; + + spin_lock_irqsave(&subpage->lock, flags); + subpage->ordered_bitmap |= tmp; + SetPageOrdered(page); + spin_unlock_irqrestore(&subpage->lock, flags); +} + +void btrfs_subpage_clear_ordered(const struct btrfs_fs_info *fs_info, + struct page *page, u64 start, u32 len) +{ + struct btrfs_subpage *subpage = (struct btrfs_subpage *)page->private; + const u16 tmp = btrfs_subpage_calc_bitmap(fs_info, page, start, len); + unsigned long flags; + + spin_lock_irqsave(&subpage->lock, flags); + subpage->ordered_bitmap &= ~tmp; + if (subpage->ordered_bitmap == 0) + ClearPageOrdered(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. @@ -451,6 +477,7 @@ IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(uptodate); IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(error); IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(dirty); IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(writeback); +IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(ordered); /* * Note that, in selftests (extent-io-tests), we can have empty fs_info passed @@ -519,3 +546,5 @@ 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); +IMPLEMENT_BTRFS_PAGE_OPS(ordered, SetPageOrdered, ClearPageOrdered, + PageOrdered); diff --git a/fs/btrfs/subpage.h b/fs/btrfs/subpage.h index 9d087ab3244e..65298a5efe7b 100644 --- a/fs/btrfs/subpage.h +++ b/fs/btrfs/subpage.h @@ -34,6 +34,9 @@ struct btrfs_subpage { struct { atomic_t readers; atomic_t writers; + + /* Tracke pending ordered extent in this sector */ + u16 ordered_bitmap; }; }; }; @@ -111,6 +114,7 @@ DECLARE_BTRFS_SUBPAGE_OPS(uptodate); DECLARE_BTRFS_SUBPAGE_OPS(error); DECLARE_BTRFS_SUBPAGE_OPS(dirty); DECLARE_BTRFS_SUBPAGE_OPS(writeback); +DECLARE_BTRFS_SUBPAGE_OPS(ordered); bool btrfs_subpage_clear_and_test_dirty(const struct btrfs_fs_info *fs_info, struct page *page, u64 start, u32 len); -- 2.20.1