From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=198.137.202.133 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793978486; b=hpovEfCYyxCMu9T51ja8KkBEEKQcmQSLQZpnV05QjIpdtMDQ/PuD+QpcPdIalmFexbh0 pDGBH19LQQSPdENdU8PIaZdajB+zRq5mdQELUjGUb61EvsHD0fgPQ6D07djpeI1TXb3iy P064HkqSeso3uEseHrtQyTR8VIRZWEKvMx8I4j6yeTP/AdzG0rQ5E6K20uCZMCVsdOwsz ercZMeTi+YgzGVmY3rHKoFAkEqCG+PGO7nvd2QdrwWYogBIH/wxM/UiWnNKOECssEthoO ShfLwFbEUfraS6JQTTPInDyUQLDBZM3AhSHN10iUDqG5hgrucRm9ejl+CYGAYVXnldA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793978486; h=DMARC-Filter:DKIM-Signature:Received:Date:From:To:Cc:Subject: Message-ID:References:MIME-Version:Content-Type:Content-Disposition: In-Reply-To:X-SRS-Rewrite; bh=Q1NE3WJ6X7I6EvJyqTueFcBcKQ9APRrKdguN5HxGMUc=; b=xhW3+i6GIndWQ6PWQg1xqIoWx2YRPGPVEFnNqGEgXI9/2z1bVt1zrAuQyCHQZu1aqU9+ O1vlbye7C07ciFZuNiZPmHVdjHzXnP+EnxOyaj5E536ziZE95X7QP4SE4ecsVRmnAIYsG xeUwM/n5qRY5uD2anfWknH857STuole4LJ1YuQkJQ6bSXkOGDoGf1nuXhsWu+dSVNU9yV bw6WwhXPIPJlPtJY63twbJTqctnTRf1eY2X174DnqS6sBZBwnO8q9oTwjbV6QHXB6BmhC ygukZpl+p/JDVKID/Ppe2IllPv8hPH0xaW/gKVsxBoJMFeJ5a3ubdue0KhvfuDFUOLw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=wGx51Sk4; arc=none smtp.remote-ip=198.137.202.133 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 58C24606D825 for ; Fri, 6 Nov 2026 15:21:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 58C24606D825 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=wGx51Sk4 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Q1NE3WJ6X7I6EvJyqTueFcBcKQ9APRrKdguN5HxGMUc=; b=wGx51Sk4ryvBmOtc6EBfiPRitJ uvg80bD0n62b5k9n3Q5yl90zNqGpZ7ptPUiLSvUcU3OlfveCv9E8McHoOzwJ+FWVnyt5vJ96uhYL5 ALPmfpfkqjaB2nw6QZ360kiSnb9PaH2q/qrY764II9sPVPpAdXP2t9JDyO9pcOzKQLnW8KEZG4LTO /QofK9uIiS4I+CVwe+1zaNjwHAOiHodxHahKlbAtyBGaKL8sjL+Zn+ftoKipFVomv9Bd+ZKKvFrXj 2r+vbTVuPIfqYQHpTU0oifvB1mL3oJUHxM8h+namA555EGE8TcE74NVIMx+RTSJFqb/n6zXIYbFFb 2mdunmbw==; Received: from hch by bombadil.infradead.org with local (Exim 4.100.1 #2 (Red Hat Linux)) id 1xPLkp-0000000Cnsm-3PQR; Fri, 06 Nov 2026 15:21:23 +0000 Date: Fri, 6 Nov 2026 07:21:23 -0800 From: Christoph Hellwig To: Lauri Gates Cc: Christoph Hellwig , linux-xfs@vger.kernel.org, Carlos Maiolino Subject: Re: Concurrent FIEMAP on reflinked files serialises on the AGF buffer lock Message-ID: References: <20261104124118.34200-1-lauri.gates@gmail.com> X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261104124118.34200-1-lauri.gates@gmail.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Wed, Nov 04, 2026 at 02:41:16PM +0200, Lauri Gates wrote: > Would the refcount-sum ioctl you describe be callable without > CAP_SYS_ADMIN? A device-wide total reveals much less than per-file > owners. I was pointed that patches for refcount reporting already exist: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/commit/?h=report-refcounts&id=9f3eca4098ff8226911f84af7b21d79670413876 and that does not require privileges, although in this form it might not be very useful for you.