From patchwork Tue Aug 27 05:09:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13778853 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 BD5C013CFB8; Tue, 27 Aug 2024 05:10:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724735442; cv=none; b=pQu214QcFreldPjvhjnU2EM1ieK96K1LhT+t4QPE+xRMaX9zQ51ZwJ0NdroGC2SwoHcTpSEcTl4CgLZS7L/PQkiRw+27sge8F783OxFQPBgSkeIRTQBGB/vuV/Y9iGSY2lQcJPgFu64Bp9pWMcXGEvVmOUQHN/wzqJ7hN3FhCvw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724735442; c=relaxed/simple; bh=BH3E2EljWKkt/EnwnIn+m7EMy7myNXtIz5HwY3J/w70=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=frPW+tcfCU/JMz5pqiuar0KyGzS4E7xF9az03nO6Asn8y7ZX1sAcgcSk4mz6DMIjb0xsICtBbPSrrb6hvI0bSmbVZHUE/UWYUS0dvEia7GRf/BJlMGmS0+RWRy89nWKpXKT0XCW+tgNNGdOYlnCuZveyPa+iaHHM5UyFZz2YdmI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ZxJPAb4t; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de 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) header.d=infradead.org header.i=@infradead.org header.b="ZxJPAb4t" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=rQX3p1gVPRWrNCtCKMUnpcimvyKViygFqeh0W5iRZZ0=; b=ZxJPAb4tqf5jOIWuYWUf84+zUt mBoC30AWCj1PWE39/B9TjyhprNUBIjyOPvYaa2VNtaLBxHDFKtGJsYA8KH1n52ZZTJEVwhkD1Bl7k a5XZ8HkxEHdEUQRcNtfOj9Ir60fmVN6nc2Brlw7/uDdcGbioC2xcx0JlceQSMwOyjOXz2TGoCcvgY 2tPGk58nzB5bAAXgrKyfTxk8FrMEzUTZ3wMKhQnugBNwTc+I+ExrYU/pafWAuuQkQ/EepP25PPEwe rlFJo0Pry5v4aG24fqaTAP4Ke5L+v8QK9IHp44dV9Or+jVSUV4CpYmlF31o2TAEmgPsBdhpXqBCHA 5z7jjzHw==; Received: from 2a02-8389-2341-5b80-0483-5781-2c2b-8fb4.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:483:5781:2c2b:8fb4] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sioTY-00000009otX-0P0Q; Tue, 27 Aug 2024 05:10:40 +0000 From: Christoph Hellwig To: Chandan Babu R , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 04/10] iomap: zeroing already holds invalidate_lock in iomap_file_buffered_write_punch_delalloc Date: Tue, 27 Aug 2024 07:09:51 +0200 Message-ID: <20240827051028.1751933-5-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240827051028.1751933-1-hch@lst.de> References: <20240827051028.1751933-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html All callers of iomap_zero_range already hold invalidate_lock, so we can't take it again in iomap_file_buffered_write_punch_delalloc. Use the passed in flags argument to detect if we're called from a zeroing operation and don't take the lock again in this case. Signed-off-by: Christoph Hellwig --- fs/iomap/buffered-io.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 34de9f58794ad5..574ca413516443 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1198,8 +1198,8 @@ static int iomap_write_delalloc_scan(struct inode *inode, * require sprinkling this code with magic "+ 1" and "- 1" arithmetic and expose * the code to subtle off-by-one bugs.... */ -static int iomap_write_delalloc_release(struct inode *inode, - loff_t start_byte, loff_t end_byte, iomap_punch_t punch) +static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, + loff_t end_byte, unsigned flags, iomap_punch_t punch) { loff_t punch_start_byte = start_byte; loff_t scan_end_byte = min(i_size_read(inode), end_byte); @@ -1210,8 +1210,13 @@ static int iomap_write_delalloc_release(struct inode *inode, * folios and dirtying them via ->page_mkwrite whilst we walk the * cache and perform delalloc extent removal. Failing to do this can * leave dirty pages with no space reservation in the cache. + * + * For zeroing operations the callers already hold invalidate_lock. */ - filemap_invalidate_lock(inode->i_mapping); + if (flags & IOMAP_ZERO) + rwsem_assert_held_write(&inode->i_mapping->invalidate_lock); + else + filemap_invalidate_lock(inode->i_mapping); while (start_byte < scan_end_byte) { loff_t data_end; @@ -1264,7 +1269,8 @@ static int iomap_write_delalloc_release(struct inode *inode, error = punch(inode, punch_start_byte, end_byte - punch_start_byte); out_unlock: - filemap_invalidate_unlock(inode->i_mapping); + if (!(flags & IOMAP_ZERO)) + filemap_invalidate_unlock(inode->i_mapping); return error; } @@ -1328,7 +1334,7 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode, if (start_byte >= end_byte) return 0; - return iomap_write_delalloc_release(inode, start_byte, end_byte, + return iomap_write_delalloc_release(inode, start_byte, end_byte, flags, punch); } EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc);