From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A38B840EBB4 for ; Mon, 20 Jul 2026 16:51:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784566280; cv=none; b=KaPy57WWsa5x/1RPOtJllQHi0JtZtGuJU4g7qb4v+r/jzTTzXQ3Ei32ohENPLNcm0OjI5DDVPuxodOD8FNYz3dyDIT6JrLDge4xalCsPVtxg3ZQZDiNVssunIUYauO0ek7EIgGpT9lShQxS02AIOZZAnUvz7m7F6nPZNHaE2iNo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784566280; c=relaxed/simple; bh=7pEMBcUBxFB6dkKSSD2HgqnwVVWHQ7s0QMPKC7Ipv30=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pLiYRSW+Eej3SwrSTlI//sg2+OqSe8EEGCW9qITOBQ7sphmz6rG3y2rFPXhgs9TXOqVE/ktMBHUtoT93Ju5cexsPqgN1IHVnz/cA2EXXyxMpFuWIFWXZ/Umcqx405eLEMDwKXamyHMBqfxeKRonJ6DMz5gBnpeq3qwKkQY3AD1A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=exExoJL0; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="exExoJL0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1AB31F00A3D; Mon, 20 Jul 2026 16:51:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784566279; bh=6ztfSg0fmB5Q4j5y4Oh1yOC4bpgNuIUqnRQJ2GJMaOE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=exExoJL0GEMFidTYlADa7id8wE3CNTutf3cfhbzwBEToU9WTg/ULiC0hiSsLPe/0D 5kXYo1JKSEtHgGg7evTw9rWdSZUWlApWJKTIxCZI/r2fnIW5Ywchf74/Oe9eZfypFi vHQ4Atzw8I3Hv/C3xXxVGkL+xalAazn4wFLpsCY9iKqveQjbG/SYO33kWeeR//mUfk 4Qq9ey+4OfUOKDnzMLkwOmWG3Oyl0XpmCjGYXgJpf6dIdLPJdEvzVwtsRr1AaFvGl+ B+GaSGYMZprKSsw6R4TquqSinN8WK6Wak/h6LdL5m/3Nm5QATignXqJ+zrPaLCa206 JSbzZp8m6nj6g== From: Sasha Levin To: stable@vger.kernel.org Cc: Qu Wenruo , Boris Burkov , David Sterba , Sasha Levin Subject: [PATCH 6.18.y 2/5] btrfs: replace for_each_set_bit() with for_each_set_bitmap() Date: Mon, 20 Jul 2026 12:51:12 -0400 Message-ID: <20260720165115.2527045-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260720165115.2527045-1-sashal@kernel.org> References: <2026071509-driveway-had-c0ca@gregkh> <20260720165115.2527045-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Qu Wenruo [ Upstream commit e6698b34fab33867ef3faeeea6feb165f31aae24 ] Inside extent_io.c, there are several simple call sites doing things like: for_each_set_bit(bit, bitmap, bitmap_size) { /* handle one fs block */ } The workload includes: - set_bit() Inside extent_writepage_io(). This can be replaced with a bitmap_set(). - btrfs_folio_set_lock() - btrfs_mark_ordered_io_finished() Inside writepage_delalloc(). Instead of calling it multiple times, we can pass a range into the function with one call. Reviewed-by: Boris Burkov Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba Stable-dep-of: ff66fe666233 ("btrfs: fix incorrect buffered IO fallback for append direct writes") Signed-off-by: Sasha Levin --- fs/btrfs/extent_io.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index b8e2b605d52c1e..88b5581df7dc16 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1427,8 +1427,9 @@ static noinline_for_stack int writepage_delalloc(struct btrfs_inode *inode, u64 delalloc_start = page_start; u64 delalloc_end = page_end; u64 delalloc_to_write = 0; + unsigned int start_bit; + unsigned int end_bit; int ret = 0; - int bit; /* Save the dirty bitmap as our submission bitmap will be a subset of it. */ if (btrfs_is_subpage(fs_info, folio)) { @@ -1438,10 +1439,12 @@ static noinline_for_stack int writepage_delalloc(struct btrfs_inode *inode, bio_ctrl->submit_bitmap = 1; } - for_each_set_bit(bit, &bio_ctrl->submit_bitmap, blocks_per_folio) { - u64 start = page_start + (bit << fs_info->sectorsize_bits); + for_each_set_bitrange(start_bit, end_bit, &bio_ctrl->submit_bitmap, + blocks_per_folio) { + u64 start = page_start + (start_bit << fs_info->sectorsize_bits); + u32 len = (end_bit - start_bit) << fs_info->sectorsize_bits; - btrfs_folio_set_lock(fs_info, folio, start, fs_info->sectorsize); + btrfs_folio_set_lock(fs_info, folio, start, len); } /* Lock all (subpage) delalloc ranges inside the folio first. */ @@ -1558,10 +1561,13 @@ static noinline_for_stack int writepage_delalloc(struct btrfs_inode *inode, fs_info->sectorsize_bits, blocks_per_folio); - for_each_set_bit(bit, &bio_ctrl->submit_bitmap, bitmap_size) - btrfs_mark_ordered_io_finished(inode, folio, - page_start + (bit << fs_info->sectorsize_bits), - fs_info->sectorsize, false); + for_each_set_bitrange(start_bit, end_bit, &bio_ctrl->submit_bitmap, + bitmap_size) { + u64 start = page_start + (start_bit << fs_info->sectorsize_bits); + u32 len = (end_bit - start_bit) << fs_info->sectorsize_bits; + + btrfs_mark_ordered_io_finished(inode, folio, start, len, false); + } return ret; } out: @@ -1727,8 +1733,8 @@ static noinline_for_stack int extent_writepage_io(struct btrfs_inode *inode, return ret; } - for (cur = start; cur < end; cur += fs_info->sectorsize) - set_bit((cur - folio_start) >> fs_info->sectorsize_bits, &range_bitmap); + bitmap_set(&range_bitmap, (start - folio_pos(folio)) >> fs_info->sectorsize_bits, + len >> fs_info->sectorsize_bits); bitmap_and(&bio_ctrl->submit_bitmap, &bio_ctrl->submit_bitmap, &range_bitmap, blocks_per_folio); -- 2.53.0