diff mbox series

[2/5] btrfs: zoned: don't clear dirty flag of extent buffer

Message ID 20231121-josef-generic-163-v1-2-049e37185841@wdc.com
State New
Headers
Series btrfs: zoned: remove extent_buffer redirtying |

Commit Message

Johannes Thumshirn Nov. 21, 2023, 4:32 p.m. UTC 
  One a zoned filesystem, never clear the dirty flag of an extent buffer,
but instead mark it as cancelled.

On writeout, when encountering cancelled extent_buffers, zero them out.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 fs/btrfs/disk-io.c   | 2 +-
 fs/btrfs/extent_io.c | 7 +++++--
 fs/btrfs/zoned.c     | 3 ++-
 3 files changed, 8 insertions(+), 4 deletions(-)

Comments

Christoph Hellwig Nov. 21, 2023, 5:03 p.m. UTC | #1 
>  	if (test_bit(EXTENT_BUFFER_CANCELLED, &eb->bflags)) {
> -		WARN_ON_ONCE(found_start != 0);
> +		memzero_extent_buffer(eb, 0, eb->len);
>  		return BLK_STS_OK;

> +	if (btrfs_is_zoned(fs_info)) {
> +		set_bit(EXTENT_BUFFER_CANCELLED, &eb->bflags);
> +		return;
> +	}

Maybe these two places would benefit from comments on why the buffer
is just marked as cancelled and zeroed out (that is to keep the
write order because block numbers are already assigned)?

Otherwise this looks great:

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ff6140e7eef7..f259bae1c3ee 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -255,7 +255,7 @@  blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio)
 		return BLK_STS_IOERR;
 
 	if (test_bit(EXTENT_BUFFER_CANCELLED, &eb->bflags)) {
-		WARN_ON_ONCE(found_start != 0);
+		memzero_extent_buffer(eb, 0, eb->len);
 		return BLK_STS_OK;
 	}
 
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 74f984885719..8bc5025ce278 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3748,6 +3748,11 @@  void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
 	if (trans && btrfs_header_generation(eb) != trans->transid)
 		return;
 
+	if (btrfs_is_zoned(fs_info)) {
+		set_bit(EXTENT_BUFFER_CANCELLED, &eb->bflags);
+		return;
+	}
+
 	if (!test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags))
 		return;
 
@@ -4139,8 +4144,6 @@  static void __write_extent_buffer(const struct extent_buffer *eb,
 	/* For unmapped (dummy) ebs, no need to check their uptodate status. */
 	const bool check_uptodate = !test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags);
 
-	WARN_ON(test_bit(EXTENT_BUFFER_CANCELLED, &eb->bflags));
-
 	if (check_eb_range(eb, start, len))
 		return;
 
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 89cd1664efe1..117e041bdc7a 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1722,7 +1722,8 @@  void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 	    btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN))
 		return;
 
-	ASSERT(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
+	ASSERT(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
+	ASSERT(test_bit(EXTENT_BUFFER_CANCELLED, &eb->bflags));
 
 	memzero_extent_buffer(eb, 0, eb->len);
 	set_bit(EXTENT_BUFFER_CANCELLED, &eb->bflags);