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From: Qu Wenruo <wqu@suse.com>
To: linux-btrfs@vger.kernel.org
Subject: [PATCH 02/12] btrfs: subpage: introduce helper for subpage writeback status
Date: Mon, 22 Feb 2021 14:33:47 +0800	[thread overview]
Message-ID: <20210222063357.92930-3-wqu@suse.com> (raw)
In-Reply-To: <20210222063357.92930-1-wqu@suse.com>

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(+)

diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c
index 16dd6fcd258d..9bc212d16d3c 100644
--- a/fs/btrfs/subpage.c
+++ b/fs/btrfs/subpage.c
@@ -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);
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.
-- 
2.30.0


  parent reply	other threads:[~2021-02-22  6:35 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-22  6:33 [PATCH 00/12] btrfs: support read-write for subpage metadata Qu Wenruo
2021-02-22  6:33 ` [PATCH 01/12] btrfs: subpage: introduce helper for subpage dirty status Qu Wenruo
2021-02-22  6:33 ` Qu Wenruo [this message]
2021-02-22  6:33 ` [PATCH 03/12] btrfs: disk-io: allow btree_set_page_dirty() to do more sanity check on subpage metadata Qu Wenruo
2021-02-22  7:58   ` Su Yue
2021-03-01 16:29     ` David Sterba
2021-02-22  6:33 ` [PATCH 04/12] btrfs: disk-io: support subpage metadata csum calculation at write time Qu Wenruo
2021-02-22  6:33 ` [PATCH 05/12] btrfs: extent_io: make alloc_extent_buffer() check subpage dirty bitmap Qu Wenruo
2021-02-22  6:33 ` [PATCH 06/12] btrfs: extent_io: make the page uptodate assert check to handle subpage Qu Wenruo
2021-02-22  6:33 ` [PATCH 07/12] btrfs: extent_io: make set/clear_extent_buffer_dirty() to support subpage sized metadata Qu Wenruo
2021-02-22  6:33 ` [PATCH 08/12] btrfs: extent_io: make set_btree_ioerr() accept extent buffer and handle subpage metadata Qu Wenruo
2021-02-22  6:33 ` [PATCH 09/12] btrfs: extent_io: introduce end_bio_subpage_eb_writepage() function Qu Wenruo
2021-03-01 16:33   ` David Sterba
2021-02-22  6:33 ` [PATCH 10/12] btrfs: extent_io: introduce write_one_subpage_eb() function Qu Wenruo
2021-02-22  6:33 ` [PATCH 11/12] btrfs: extent_io: make lock_extent_buffer_for_io() to support subpage metadata Qu Wenruo
2021-02-22  6:33 ` [PATCH 12/12] btrfs: extent_io: introduce submit_eb_subpage() to submit a subpage metadata page Qu Wenruo
2021-03-01 16:22 ` [PATCH 00/12] btrfs: support read-write for subpage metadata David Sterba
2021-03-01 16:30 ` David Sterba
2021-03-02  0:18   ` Qu Wenruo

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