From patchwork Tue Dec 5 23:56:50 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ross Zwisler X-Patchwork-Id: 10094173 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CCE106020F for ; Tue, 5 Dec 2017 23:57:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BB3E52949D for ; Tue, 5 Dec 2017 23:57:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AC636299F7; Tue, 5 Dec 2017 23:57:11 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=unavailable version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3538F294B6 for ; Tue, 5 Dec 2017 23:57:10 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 95FE120352AB5; Tue, 5 Dec 2017 15:52:38 -0800 (PST) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: None (no SPF record) identity=mailfrom; client-ip=192.55.52.88; helo=mga01.intel.com; envelope-from=ross.zwisler@linux.intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id D21BB20352A8A for ; Tue, 5 Dec 2017 15:52:36 -0800 (PST) Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Dec 2017 15:57:06 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,365,1508828400"; d="scan'208";a="181701315" Received: from theros.lm.intel.com ([10.232.112.77]) by orsmga005.jf.intel.com with ESMTP; 05 Dec 2017 15:57:06 -0800 From: Ross Zwisler To: linux-xfs Subject: [xfsprogs PATCH v2 2/3] xfs_io: add MAP_SYNC support to mmap() Date: Tue, 5 Dec 2017 16:56:50 -0700 Message-Id: <20171205235651.17102-3-ross.zwisler@linux.intel.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20171205235651.17102-1-ross.zwisler@linux.intel.com> References: <20171205235651.17102-1-ross.zwisler@linux.intel.com> X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jan Kara , linux-nvdimm , Dave Chinner , fstests MIME-Version: 1.0 Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Add support for a new -S flag to xfs_io's mmap command. This opens the mapping with the (MAP_SYNC | MAP_SHARED_VALIDATE) flags instead of the standard MAP_SHARED flag. Signed-off-by: Ross Zwisler Suggested-by: Dave Chinner --- configure.ac | 1 + include/builddefs.in | 1 + include/linux.h | 8 ++++++++ io/Makefile | 4 ++++ io/io.h | 1 + io/mmap.c | 23 ++++++++++++++++++----- m4/package_libcdev.m4 | 16 ++++++++++++++++ man/man8/xfs_io.8 | 6 +++++- 8 files changed, 54 insertions(+), 6 deletions(-) diff --git a/configure.ac b/configure.ac index e5d0309f..f3325aa0 100644 --- a/configure.ac +++ b/configure.ac @@ -163,6 +163,7 @@ AC_HAVE_MREMAP AC_NEED_INTERNAL_FSXATTR AC_HAVE_GETFSMAP AC_HAVE_STATFS_FLAGS +AC_HAVE_MAP_SYNC if test "$enable_blkid" = yes; then AC_HAVE_BLKID_TOPO diff --git a/include/builddefs.in b/include/builddefs.in index fd274ddc..126f7e95 100644 --- a/include/builddefs.in +++ b/include/builddefs.in @@ -115,6 +115,7 @@ HAVE_MREMAP = @have_mremap@ NEED_INTERNAL_FSXATTR = @need_internal_fsxattr@ HAVE_GETFSMAP = @have_getfsmap@ HAVE_STATFS_FLAGS = @have_statfs_flags@ +HAVE_MAP_SYNC = @have_map_sync@ GCCFLAGS = -funsigned-char -fno-strict-aliasing -Wall # -Wbitwise -Wno-transparent-union -Wno-old-initializer -Wno-decl diff --git a/include/linux.h b/include/linux.h index 6ce344c5..1998941a 100644 --- a/include/linux.h +++ b/include/linux.h @@ -327,4 +327,12 @@ fsmap_advance( #define HAVE_GETFSMAP #endif /* HAVE_GETFSMAP */ +#ifndef HAVE_MAP_SYNC +#define MAP_SYNC 0 +#define MAP_SHARED_VALIDATE 0 +#else +#include +#include +#endif /* HAVE_MAP_SYNC */ + #endif /* __XFS_LINUX_H__ */ diff --git a/io/Makefile b/io/Makefile index 6725936d..2987ee11 100644 --- a/io/Makefile +++ b/io/Makefile @@ -103,6 +103,10 @@ ifeq ($(HAVE_MREMAP),yes) LCFLAGS += -DHAVE_MREMAP endif +ifeq ($(HAVE_MAP_SYNC),yes) +LCFLAGS += -DHAVE_MAP_SYNC +endif + # On linux we get fsmap from the system or define it ourselves # so include this based on platform type. If this reverts to only # the autoconf check w/o local definition, change to testing HAVE_GETFSMAP diff --git a/io/io.h b/io/io.h index 3862985f..8b2753b3 100644 --- a/io/io.h +++ b/io/io.h @@ -65,6 +65,7 @@ typedef struct mmap_region { size_t length; /* length of mapping */ off64_t offset; /* start offset into backing file */ int prot; /* protection mode of the mapping */ + bool map_sync; /* is this a MAP_SYNC mapping? */ char *name; /* name of backing file */ } mmap_region_t; diff --git a/io/mmap.c b/io/mmap.c index 7a8150e3..84319f48 100644 --- a/io/mmap.c +++ b/io/mmap.c @@ -42,7 +42,7 @@ print_mapping( int index, int braces) { - unsigned char buffer[8] = { 0 }; + char buffer[8] = { 0 }; int i; static struct { @@ -57,6 +57,10 @@ print_mapping( for (i = 0, p = pflags; p->prot != PROT_NONE; i++, p++) buffer[i] = (map->prot & p->prot) ? p->mode : '-'; + + if (map->map_sync) + sprintf(&buffer[i], " S"); + printf("%c%03d%c 0x%lx - 0x%lx %s %14s (%lld : %ld)\n", braces? '[' : ' ', index, braces? ']' : ' ', (unsigned long)map->addr, @@ -146,6 +150,7 @@ mmap_help(void) " -r -- map with PROT_READ protection\n" " -w -- map with PROT_WRITE protection\n" " -x -- map with PROT_EXEC protection\n" +" -S -- map with MAP_SYNC and MAP_SHARED_VALIDATE flags\n" " -s -- first do mmap(size)/munmap(size), try to reserve some free space\n" " If no protection mode is specified, all are used by default.\n" "\n")); @@ -161,7 +166,7 @@ mmap_f( void *address = NULL; char *filename; size_t blocksize, sectsize; - int c, prot = 0; + int c, prot = 0, flags = MAP_SHARED; if (argc == 1) { if (mapping) @@ -184,7 +189,7 @@ mmap_f( init_cvtnum(&blocksize, §size); - while ((c = getopt(argc, argv, "rwxs:")) != EOF) { + while ((c = getopt(argc, argv, "rwxSs:")) != EOF) { switch (c) { case 'r': prot |= PROT_READ; @@ -195,6 +200,13 @@ mmap_f( case 'x': prot |= PROT_EXEC; break; + case 'S': + flags = MAP_SYNC | MAP_SHARED_VALIDATE; + if (!flags) { + printf("MAP_SYNC not supported\n"); + return 0; + } + break; case 's': length2 = cvtnum(blocksize, sectsize, optarg); break; @@ -238,7 +250,7 @@ mmap_f( MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); munmap(address, length2); } - address = mmap(address, length, prot, MAP_SHARED, file->fd, offset); + address = mmap(address, length, prot, flags, file->fd, offset); if (address == MAP_FAILED) { perror("mmap"); free(filename); @@ -263,6 +275,7 @@ mmap_f( mapping->offset = offset; mapping->name = filename; mapping->prot = prot; + mapping->map_sync = (flags == (MAP_SYNC | MAP_SHARED_VALIDATE)); return 0; } @@ -676,7 +689,7 @@ mmap_init(void) mmap_cmd.argmax = -1; mmap_cmd.flags = CMD_NOMAP_OK | CMD_NOFILE_OK | CMD_FOREIGN_OK | CMD_FLAG_ONESHOT; - mmap_cmd.args = _("[N] | [-rwx] [-s size] [off len]"); + mmap_cmd.args = _("[N] | [-rwxS] [-s size] [off len]"); mmap_cmd.oneline = _("mmap a range in the current file, show mappings"); mmap_cmd.help = mmap_help; diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4 index 7b4dfc85..71cedc5c 100644 --- a/m4/package_libcdev.m4 +++ b/m4/package_libcdev.m4 @@ -328,3 +328,19 @@ AC_DEFUN([AC_HAVE_STATFS_FLAGS], ) AC_SUBST(have_statfs_flags) ]) + +# +# Check if we have MAP_SYNC defines (Linux) +# +AC_DEFUN([AC_HAVE_MAP_SYNC], + [ AC_MSG_CHECKING([for MAP_SYNC]) + AC_TRY_COMPILE([ +#include +#include + ], [ + int flags = MAP_SYNC | MAP_SHARED_VALIDATE; + ], have_map_sync=yes + AC_MSG_RESULT(yes), + AC_MSG_RESULT(no)) + AC_SUBST(have_map_sync) + ]) diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8 index 9bf1a478..1693f7f1 100644 --- a/man/man8/xfs_io.8 +++ b/man/man8/xfs_io.8 @@ -764,7 +764,7 @@ Each (sec, nsec) pair constitutes a single timestamp value. .SH MEMORY MAPPED I/O COMMANDS .TP -.BI "mmap [ " N " | [[ \-rwx ] [\-s " size " ] " "offset length " ]] +.BI "mmap [ " N " | [[ \-rwxS ] [\-s " size " ] " "offset length " ]] With no arguments, .B mmap shows the current mappings. Specifying a single numeric argument @@ -780,6 +780,10 @@ PROT_WRITE .RB ( \-w ), and PROT_EXEC .RB ( \-x ). +The mapping will be created with the MAP_SHARED flag by default, or with the +Linux specific (MAP_SYNC | MAP_SHARED_VALIDATE) flags if +.B -S +is given. .BI \-s " size" is used to do a mmap(size) && munmap(size) operation at first, try to reserve some extendible free memory space, if