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authorQu Wenruo <wqu@suse.com>2021-03-25 15:14:38 +0800
committerDavid Sterba <dsterba@suse.com>2021-04-19 17:25:18 +0200
commit3470da3b7d87fde4b9729d4e29c2dc074cd59c10 (patch)
tree6d9cef321e1d3c5519a22e13e508b4218c84ef5c /fs/btrfs/subpage.c
parentd8a5713e891dab2b0d13a82455df8ddf73fa9af4 (diff)
downloadlinux-3470da3b7d87fde4b9729d4e29c2dc074cd59c10.tar.bz2
btrfs: subpage: introduce helpers for writeback status
Introduces the following functions to handle subpage writeback status: - btrfs_subpage_set_writeback() - btrfs_subpage_clear_writeback() - btrfs_subpage_test_writeback() These 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() These helpers can handle both regular sector size and subpage without problem. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/subpage.c')
-rw-r--r--fs/btrfs/subpage.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c
index 7ae5a77e5f40..df1461cea507 100644
--- a/fs/btrfs/subpage.c
+++ b/fs/btrfs/subpage.c
@@ -269,6 +269,33 @@ 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.
@@ -290,6 +317,7 @@ 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
@@ -328,3 +356,5 @@ 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);