Add a new 'log_writes' command to xfs_io so that we can add dm-log-writes log marks. It's helpful to allow users of xfs_io to adds these marks from within xfs_io instead of waiting until after xfs_io exits because then they are able to replay the dm-log-writes log up to immediately after another xfs_io operation such as mwrite. This isolates the log replay from other operations that happen as part of xfs_io exiting (file handles being closed, mmaps being torn down, etc.). This also allows users to insert multiple marks between different xfs_io commands. Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Suggested-by: Dave Chinner <david@xxxxxxxxxxxxx> Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> --- configure.ac | 1 + debian/control | 2 +- include/builddefs.in | 2 + io/Makefile | 6 +++ io/init.c | 1 + io/io.h | 6 +++ io/log_writes.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++ m4/Makefile | 1 + m4/package_devmapper.m4 | 11 +++++ man/man8/xfs_io.8 | 23 ++++++++++- 10 files changed, 157 insertions(+), 2 deletions(-) create mode 100644 io/log_writes.c create mode 100644 m4/package_devmapper.m4 diff --git a/configure.ac b/configure.ac index f3325aa0..f83d5817 100644 --- a/configure.ac +++ b/configure.ac @@ -164,6 +164,7 @@ AC_NEED_INTERNAL_FSXATTR AC_HAVE_GETFSMAP AC_HAVE_STATFS_FLAGS AC_HAVE_MAP_SYNC +AC_HAVE_DEVMAPPER if test "$enable_blkid" = yes; then AC_HAVE_BLKID_TOPO diff --git a/debian/control b/debian/control index ad816622..5c26e3d7 100644 --- a/debian/control +++ b/debian/control @@ -3,7 +3,7 @@ Section: admin Priority: optional Maintainer: XFS Development Team <linux-xfs@xxxxxxxxxxxxxxx> Uploaders: Nathan Scott <nathans@xxxxxxxxxx>, Anibal Monsalve Salazar <anibal@xxxxxxxxxx> -Build-Depends: uuid-dev, dh-autoreconf, debhelper (>= 5), gettext, libtool, libreadline-gplv2-dev | libreadline5-dev, libblkid-dev (>= 2.17), linux-libc-dev +Build-Depends: uuid-dev, dh-autoreconf, debhelper (>= 5), gettext, libtool, libreadline-gplv2-dev | libreadline5-dev, libblkid-dev (>= 2.17), linux-libc-dev, libdevmapper-dev Standards-Version: 3.9.1 Homepage: http://xfs.org/ diff --git a/include/builddefs.in b/include/builddefs.in index 126f7e95..66bdbfa2 100644 --- a/include/builddefs.in +++ b/include/builddefs.in @@ -35,6 +35,7 @@ LIBTERMCAP = @libtermcap@ LIBEDITLINE = @libeditline@ LIBREADLINE = @libreadline@ LIBBLKID = @libblkid@ +LIBDEVMAPPER = @libdevmapper@ LIBXFS = $(TOPDIR)/libxfs/libxfs.la LIBXCMD = $(TOPDIR)/libxcmd/libxcmd.la LIBXLOG = $(TOPDIR)/libxlog/libxlog.la @@ -116,6 +117,7 @@ NEED_INTERNAL_FSXATTR = @need_internal_fsxattr@ HAVE_GETFSMAP = @have_getfsmap@ HAVE_STATFS_FLAGS = @have_statfs_flags@ HAVE_MAP_SYNC = @have_map_sync@ +HAVE_DEVMAPPER = @have_devmapper@ GCCFLAGS = -funsigned-char -fno-strict-aliasing -Wall # -Wbitwise -Wno-transparent-union -Wno-old-initializer -Wno-decl diff --git a/io/Makefile b/io/Makefile index 2987ee11..b7585a1b 100644 --- a/io/Makefile +++ b/io/Makefile @@ -107,6 +107,12 @@ ifeq ($(HAVE_MAP_SYNC),yes) LCFLAGS += -DHAVE_MAP_SYNC endif +ifeq ($(HAVE_DEVMAPPER),yes) +CFILES += log_writes.c +LLDLIBS += $(LIBDEVMAPPER) +LCFLAGS += -DHAVE_DEVMAPPER +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/init.c b/io/init.c index 20d5f80d..34d87b5f 100644 --- a/io/init.c +++ b/io/init.c @@ -72,6 +72,7 @@ init_commands(void) help_init(); imap_init(); inject_init(); + log_writes_init(); madvise_init(); mincore_init(); mmap_init(); diff --git a/io/io.h b/io/io.h index 8b2753b3..9349cc75 100644 --- a/io/io.h +++ b/io/io.h @@ -186,3 +186,9 @@ extern void fsmap_init(void); #else # define fsmap_init() do { } while (0) #endif + +#ifdef HAVE_DEVMAPPER +extern void log_writes_init(void); +#else +#define log_writes_init() do { } while (0) +#endif diff --git a/io/log_writes.c b/io/log_writes.c new file mode 100644 index 00000000..46ea1c26 --- /dev/null +++ b/io/log_writes.c @@ -0,0 +1,106 @@ +/* + * Copyright (c) 2017 Intel Corporation. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "platform_defs.h" +#include <libdevmapper.h> +#include "command.h" +#include "init.h" + +static cmdinfo_t log_writes_cmd; + +static int +mark_log(const char *device, const char *mark) +{ + struct dm_task *dmt; + const int size = 80; + char message[size]; + int len, ret = 0; + + len = snprintf(message, size, "mark %s", mark); + if (len >= size) { + printf("mark '%s' is too long\n", mark); + return ret; + } + + if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG))) + return ret; + + if (!dm_task_set_name(dmt, device)) + goto out; + + if (!dm_task_set_sector(dmt, 0)) + goto out; + + if (!dm_task_set_message(dmt, message)) + goto out; + + if (dm_task_run(dmt)) + ret = 1; +out: + dm_task_destroy(dmt); + return ret; +} + +static int +log_writes_f( + int argc, + char **argv) +{ + const char *device = NULL; + const char *mark = NULL; + int c; + + exitcode = 1; + while ((c = getopt(argc, argv, "d:m:")) != EOF) { + switch (c) { + case 'd': + device = optarg; + break; + case 'm': + mark = optarg; + break; + default: + return command_usage(&log_writes_cmd); + } + } + + if (device == NULL || mark == NULL) + return command_usage(&log_writes_cmd); + + if (mark_log(device, mark)) + exitcode = 0; + + return 0; +} + +void +log_writes_init(void) +{ + log_writes_cmd.name = "log_writes"; + log_writes_cmd.altname = "lw"; + log_writes_cmd.cfunc = log_writes_f; + log_writes_cmd.flags = CMD_NOMAP_OK | CMD_NOFILE_OK | CMD_FOREIGN_OK + | CMD_FLAG_ONESHOT; + log_writes_cmd.argmin = 0; + log_writes_cmd.argmax = -1; + log_writes_cmd.args = _("-d device -m mark"); + log_writes_cmd.oneline = + _("create mark <mark> in the dm-log-writes log specified by <device>"); + + add_command(&log_writes_cmd); +} diff --git a/m4/Makefile b/m4/Makefile index 4706121b..77f2edda 100644 --- a/m4/Makefile +++ b/m4/Makefile @@ -15,6 +15,7 @@ CONFIGURE = \ LSRCFILES = \ manual_format.m4 \ package_blkid.m4 \ + package_devmapper.m4 \ package_globals.m4 \ package_libcdev.m4 \ package_pthread.m4 \ diff --git a/m4/package_devmapper.m4 b/m4/package_devmapper.m4 new file mode 100644 index 00000000..821f283c --- /dev/null +++ b/m4/package_devmapper.m4 @@ -0,0 +1,11 @@ +# +# See if libdevmapper is available on the system. +# +AC_DEFUN([AC_HAVE_DEVMAPPER], +[ AC_SEARCH_LIBS([dm_task_create], [devmapper], + libdevmapper="-ldevmapper" + have_devmapper=yes, + have_devmapper=no,) + AC_SUBST(have_devmapper) + AC_SUBST(libdevmapper) +]) diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8 index 1693f7f1..4fce6d39 100644 --- a/man/man8/xfs_io.8 +++ b/man/man8/xfs_io.8 @@ -1123,7 +1123,27 @@ version of policy structure (numeric) .BR get_encpolicy On filesystems that support encryption, display the encryption policy of the current file. +.RE +.PD +.TP +.BI "log_writes \-d " device " \-m " mark +Create a mark named +.I mark +in the dm-log-writes log specified by +.I device. +This is intended to be equivalent to the shell command: +.B dmsetup message +.I device +.B 0 mark +.I mark +.PD +.RE +.TP +.B lw +See the +.B log_writes +command. .SH SEE ALSO .BR mkfs.xfs (8), .BR xfsctl (3), @@ -1141,4 +1161,5 @@ current file. .BR open (2), .BR pread (2), .BR pwrite (2), -.BR readdir (3). +.BR readdir (3), +.BR dmsetup (8). -- 2.14.3 -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
