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Thu, 20 Nov 2025 06:01:18 -0800 (PST) Received: from SaltyKitkat ([195.88.211.122]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29b5b13a80csm28660985ad.35.2025.11.20.06.01.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Nov 2025 06:01:17 -0800 (PST) From: Sun YangKai To: linux-btrfs@vger.kernel.org Cc: Sun YangKai Subject: [PATCH 1/2] btrfs: add comment for btrfs_clear_buffer_dirty Date: Thu, 20 Nov 2025 21:57:04 +0800 Message-ID: <20251120140030.2770-4-sunk67188@gmail.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251120140030.2770-2-sunk67188@gmail.com> References: <20251120140030.2770-2-sunk67188@gmail.com> Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Signed-off-by: Sun YangKai --- fs/btrfs/extent_io.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 23273d0e6f22..e80066fc0f02 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3678,6 +3678,26 @@ static void btree_clear_folio_dirty_tag(struct folio *folio) xa_unlock_irq(&folio->mapping->i_pages); } +/* + * btrfs_clear_buffer_dirty - Clear the dirty state of an extent buffer + * @trans: Transaction handle, may be NULL. + * If provided, the buffer must belong to the transaction + * (checked via btrfs_header_generation). If the check failed, + * the function returns immediately. + * @eb: The extent buffer to clean. + * + * This function clears the dirty flag from @eb and updates all accounting + * that depends on it (per-CPU counter of dirty metadata bytes, folio dirty + * state, address-space tags). + * + * Special behaviour in zoned mode: + * When the filesystem is zoned (btrfs_is_zoned) the buffer is *not* + * immediately cleaned. Instead the EXTENT_BUFFER_ZONED_ZEROOUT flag is + * set and the buffer remains conceptually dirty. The physical zero-out + * required by zoned devices is deferred until btree_csum_one_bio(), which + * preserves write-ordering constraints without forcing callers to re-dirty + * the buffer later. + */ void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans, struct extent_buffer *eb) { -- 2.51.2