[RFC, PATCH 3/2] xfsprogs: space management tool

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From: Dave Chinner <dchinner@xxxxxxxxxx>

xfs_spaceman is intended as a diagnostic and control tool for space
management operations within XFS. Operations like examining free
space, managing allocation policies, issuing block discards on free
space, etc.

The tool is modelled on the xfs_io interface, allowing both
interactive and command line control of the tool, enabling it to be
used in scripts and automated management tools.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
 Makefile          |    3 +-
 spaceman/Makefile |   34 +++++
 spaceman/file.c   |  149 +++++++++++++++++++++
 spaceman/freesp.c |  377 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 spaceman/init.c   |  117 +++++++++++++++++
 spaceman/init.h   |   24 ++++
 spaceman/space.h  |   37 ++++++
 7 files changed, 740 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index c40fb2c..a81b8b2 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ endif
 
 LIB_SUBDIRS = libxfs libxlog libxcmd libhandle libdisk
 TOOL_SUBDIRS = copy db estimate fsck fsr growfs io logprint mkfs quota \
-		mdrestore repair rtcp m4 man doc po debian
+		mdrestore repair rtcp m4 man doc po debian spaceman
 
 SUBDIRS = include $(LIB_SUBDIRS) $(TOOL_SUBDIRS)
 
@@ -62,6 +62,7 @@ io: libxcmd libhandle
 mkfs: libxfs
 quota: libxcmd
 repair: libxfs libxlog
+space: libxcmd
 
 ifneq ($(ENABLE_BLKID), yes)
 mkfs: libdisk
diff --git a/spaceman/Makefile b/spaceman/Makefile
new file mode 100644
index 0000000..612d36b
--- /dev/null
+++ b/spaceman/Makefile
@@ -0,0 +1,34 @@
+#
+# Copyright (c) 2012 Red Hat, Inc.  All Rights Reserved.
+#
+
+TOPDIR = ..
+include $(TOPDIR)/include/builddefs
+
+LTCOMMAND = xfs_spaceman
+HFILES = init.h space.h
+CFILES = init.c \
+	file.c freesp.c
+
+LLDLIBS = $(LIBXCMD)
+LTDEPENDENCIES = $(LIBXCMD)
+LLDFLAGS = -static
+
+ifeq ($(ENABLE_READLINE),yes)
+LLDLIBS += $(LIBREADLINE) $(LIBTERMCAP)
+endif
+
+ifeq ($(ENABLE_EDITLINE),yes)
+LLDLIBS += $(LIBEDITLINE) $(LIBTERMCAP)
+endif
+
+default: depend $(LTCOMMAND)
+
+include $(BUILDRULES)
+
+install: default
+	$(INSTALL) -m 755 -d $(PKG_SBIN_DIR)
+	$(LTINSTALL) -m 755 $(LTCOMMAND) $(PKG_SBIN_DIR)
+install-dev:
+
+-include .dep
diff --git a/spaceman/file.c b/spaceman/file.c
new file mode 100644
index 0000000..ea4ab0c
--- /dev/null
+++ b/spaceman/file.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2004-2005 Silicon Graphics, Inc.
+ * Copyright (c) 2012 Red Hat, Inc.
+ * 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 <xfs/xfs.h>
+#include <xfs/command.h>
+#include <xfs/input.h>
+#include <sys/mman.h>
+#include "init.h"
+#include "space.h"
+
+static cmdinfo_t print_cmd;
+
+fileio_t	*filetable;
+int		filecount;
+fileio_t	*file;
+
+static void
+print_fileio(
+	fileio_t	*file,
+	int		index,
+	int		braces)
+{
+	printf(_("%c%03d%c %-14s (%s,%s,%s%s%s)\n"),
+		braces? '[' : ' ', index, braces? ']' : ' ', file->name,
+		file->flags & O_SYNC ? _("sync") : _("non-sync"),
+		file->flags & O_DIRECT ? _("direct") : _("non-direct"),
+		file->flags & O_RDONLY ? _("read-only") : _("read-write"),
+		file->flags & O_APPEND ? _(",append-only") : "",
+		file->flags & O_NONBLOCK ? _(",non-block") : "");
+}
+
+int
+filelist_f(void)
+{
+	int		i;
+
+	for (i = 0; i < filecount; i++)
+		print_fileio(&filetable[i], i, &filetable[i] == file);
+	return 0;
+}
+
+static int
+print_f(
+	int		argc,
+	char		**argv)
+{
+	filelist_f();
+	return 0;
+}
+
+int
+openfile(
+	char		*path,
+	xfs_fsop_geom_t	*geom,
+	int		flags,
+	mode_t		mode)
+{
+	int		fd;
+
+	fd = open(path, flags, mode);
+	if (fd < 0) {
+		if ((errno == EISDIR) && (flags & O_RDWR)) {
+			/* make it as if we asked for O_RDONLY & try again */
+			flags &= ~O_RDWR;
+			flags |= O_RDONLY;
+			fd = open(path, flags, mode);
+			if (fd < 0) {
+				perror(path);
+				return -1;
+			}
+		} else {
+			perror(path);
+			return -1;
+		}
+	}
+
+	if (xfsctl(path, fd, XFS_IOC_FSGEOMETRY, geom) < 0) {
+		perror("XFS_IOC_FSGEOMETRY");
+		close(fd);
+		return -1;
+	}
+	return fd;
+}
+
+int
+addfile(
+	char		*name,
+	int		fd,
+	xfs_fsop_geom_t	*geometry,
+	int		flags)
+{
+	char		*filename;
+
+	filename = strdup(name);
+	if (!filename) {
+		perror("strdup");
+		close(fd);
+		return -1;
+	}
+
+	/* Extend the table of currently open files */
+	filetable = (fileio_t *)realloc(filetable,	/* growing */
+					++filecount * sizeof(fileio_t));
+	if (!filetable) {
+		perror("realloc");
+		filecount = 0;
+		free(filename);
+		close(fd);
+		return -1;
+	}
+
+	/* Finally, make this the new active open file */
+	file = &filetable[filecount - 1];
+	file->fd = fd;
+	file->flags = flags;
+	file->name = filename;
+	file->geom = *geometry;
+	return 0;
+}
+
+void
+file_init(void)
+{
+	print_cmd.name = "print";
+	print_cmd.altname = "p";
+	print_cmd.cfunc = print_f;
+	print_cmd.argmin = 0;
+	print_cmd.argmax = 0;
+	print_cmd.flags = CMD_FLAG_GLOBAL;
+	print_cmd.oneline = _("list current open files");
+
+	add_command(&print_cmd);
+}
diff --git a/spaceman/freesp.c b/spaceman/freesp.c
new file mode 100644
index 0000000..bfc93c9
--- /dev/null
+++ b/spaceman/freesp.c
@@ -0,0 +1,377 @@
+/*
+ * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2012 Red Hat, Inc.
+ * 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 <xfs/xfs.h>
+#include <xfs/xfs_types.h>
+#include <xfs/command.h>
+#include <linux/fs.h>
+#include <linux/fiemap.h>
+#include "init.h"
+#include "space.h"
+
+#ifndef FIEMAP_FLAG_FREESPACE
+#define FIEMAP_FLAG_FREESPACE		0x4
+#define FIEMAP_FLAG_FREESPACE_SIZE	0x8
+#endif
+
+typedef struct histent
+{
+	int		low;
+	int		high;
+	long long	count;
+	long long	blocks;
+} histent_t;
+
+static int		agcount;
+static xfs_agnumber_t	*aglist;
+static int		countflag;
+static int		dumpflag;
+static int		equalsize;
+static histent_t	*hist;
+static int		histcount;
+static int		multsize;
+static int		seen1;
+static int		summaryflag;
+static long long	totblocks;
+static long long	totexts;
+
+static cmdinfo_t freesp_cmd;
+
+static void
+addhistent(
+	int	h)
+{
+	hist = realloc(hist, (histcount + 1) * sizeof(*hist));
+	if (h == 0)
+		h = 1;
+	hist[histcount].low = h;
+	hist[histcount].count = hist[histcount].blocks = 0;
+	histcount++;
+	if (h == 1)
+		seen1 = 1;
+}
+
+static void
+addtohist(
+	xfs_agnumber_t	agno,
+	xfs_agblock_t	agbno,
+	off64_t		len)
+{
+	int		i;
+
+	if (dumpflag)
+		printf("%8d %8d %8Zu\n", agno, agbno, len);
+	totexts++;
+	totblocks += len;
+	for (i = 0; i < histcount; i++) {
+		if (hist[i].high >= len) {
+			hist[i].count++;
+			hist[i].blocks += len;
+			break;
+		}
+	}
+}
+
+static int
+hcmp(
+	const void	*a,
+	const void	*b)
+{
+	return ((histent_t *)a)->low - ((histent_t *)b)->low;
+}
+
+static void
+histinit(
+	int	maxlen)
+{
+	int	i;
+
+	if (equalsize) {
+		for (i = 1; i < maxlen; i += equalsize)
+			addhistent(i);
+	} else if (multsize) {
+		for (i = 1; i < maxlen; i *= multsize)
+			addhistent(i);
+	} else {
+		if (!seen1)
+			addhistent(1);
+		qsort(hist, histcount, sizeof(*hist), hcmp);
+	}
+	for (i = 0; i < histcount; i++) {
+		if (i < histcount - 1)
+			hist[i].high = hist[i + 1].low - 1;
+		else
+			hist[i].high = maxlen;
+	}
+}
+
+static void
+printhist(void)
+{
+	int	i;
+
+	printf("%7s %7s %7s %7s %6s\n",
+		_("from"), _("to"), _("extents"), _("blocks"), _("pct"));
+	for (i = 0; i < histcount; i++) {
+		if (hist[i].count)
+			printf("%7d %7d %7lld %7lld %6.2f\n", hist[i].low,
+				hist[i].high, hist[i].count, hist[i].blocks,
+				hist[i].blocks * 100.0 / totblocks);
+	}
+}
+
+static int
+inaglist(
+	xfs_agnumber_t	agno)
+{
+	int		i;
+
+	if (agcount == 0)
+		return 1;
+	for (i = 0; i < agcount; i++)
+		if (aglist[i] == agno)
+			return 1;
+	return 0;
+}
+
+#define NR_EXTENTS 128
+
+static void
+scan_ag(
+	xfs_agnumber_t	agno)
+{
+	struct fiemap	*fiemap;
+	off64_t		blocksize = file->geom.blocksize;
+	uint64_t	last_logical = agno * file->geom.agblocks * blocksize;
+	uint64_t	length = file->geom.agblocks * blocksize;
+	off64_t		fsbperag;
+	int		fiemap_flags;
+	int		last = 0;
+	int		map_size;
+
+
+	last_logical = (off64_t)file->geom.agblocks * blocksize * agno;
+	length = (off64_t)file->geom.agblocks * blocksize;
+	fsbperag = (off64_t)file->geom.agblocks * blocksize;
+
+	map_size = sizeof(struct fiemap) +
+		   sizeof(struct fiemap_extent) * NR_EXTENTS;
+	fiemap = malloc(map_size);
+	if (!fiemap) {
+		fprintf(stderr, _("%s: fiemap malloc failed.\n"), progname);
+		exitcode = 1;
+		return;
+	}
+	if (countflag)
+		fiemap_flags = FIEMAP_FLAG_FREESPACE_SIZE;
+	else
+		fiemap_flags = FIEMAP_FLAG_FREESPACE;
+
+	while (!last) {
+		xfs_agblock_t	agbno;
+		int		ret;
+		int		i;
+
+		memset(fiemap, 0, map_size);
+		fiemap->fm_flags = fiemap_flags;
+		fiemap->fm_start = last_logical;
+		fiemap->fm_length = length;
+		fiemap->fm_extent_count = NR_EXTENTS;
+
+		ret = ioctl(file->fd, FS_IOC_FIEMAP, (unsigned long)fiemap);
+		if (ret < 0) {
+			fprintf(stderr, "%s: ioctl(FS_IOC_FIEMAP) [\"%s\"]: "
+				"%s\n", progname, file->name, strerror(errno));
+			free(fiemap);
+			exitcode = 1;
+			return;
+		}
+
+		/* No more extents to map, exit */
+		if (!fiemap->fm_mapped_extents)
+			break;
+
+		for (i = 0; i < fiemap->fm_mapped_extents; i++) {
+			struct fiemap_extent	*extent;
+			off64_t			aglen;
+
+			extent = &fiemap->fm_extents[i];
+
+
+			agbno = (extent->fe_physical - (fsbperag * agno)) /
+								blocksize;
+			aglen = extent->fe_length / blocksize;
+
+			addtohist(agno, agbno, aglen);
+
+			/*
+			 * we have to keep track of the highest offset extent we
+			 * see when getting size ordered free space, so just do
+			 * for all extents we get.
+			 */
+			last_logical = max(last_logical,
+					extent->fe_logical + extent->fe_length);
+
+			if (extent->fe_flags & FIEMAP_EXTENT_LAST) {
+				last = 1;
+				break;
+			}
+		}
+	}
+}
+static void
+aglistadd(
+	char	*a)
+{
+	aglist = realloc(aglist, (agcount + 1) * sizeof(*aglist));
+	aglist[agcount] = (xfs_agnumber_t)atoi(a);
+	agcount++;
+}
+
+static int
+init(
+	int		argc,
+	char		**argv)
+{
+	int		c;
+	int		speced = 0;
+
+	agcount = countflag = dumpflag = equalsize = multsize = optind = 0;
+	histcount = seen1 = summaryflag = 0;
+	totblocks = totexts = 0;
+	aglist = NULL;
+	hist = NULL;
+	while ((c = getopt(argc, argv, "a:bcde:h:m:s")) != EOF) {
+		switch (c) {
+		case 'a':
+			aglistadd(optarg);
+			break;
+		case 'b':
+			if (speced)
+				return 0;
+			multsize = 2;
+			speced = 1;
+			break;
+		case 'c':
+			countflag = 1;
+			break;
+		case 'd':
+			dumpflag = 1;
+			break;
+		case 'e':
+			if (speced)
+				return 0;
+			equalsize = atoi(optarg);
+			speced = 1;
+			break;
+		case 'h':
+			if (speced && !histcount)
+				return 0;
+			addhistent(atoi(optarg));
+			speced = 1;
+			break;
+		case 'm':
+			if (speced)
+				return 0;
+			multsize = atoi(optarg);
+			speced = 1;
+			break;
+		case 's':
+			summaryflag = 1;
+			break;
+		case '?':
+			return 0;
+		}
+	}
+	if (optind != argc)
+		return 0;
+	if (!speced)
+		multsize = 2;
+	histinit(file->geom.agblocks);
+	return 1;
+}
+
+/*
+ * Report on freespace usage in xfs filesystem.
+ */
+static int
+freesp_f(
+	int		argc,
+	char		**argv)
+{
+	xfs_agnumber_t	agno;
+
+	if (!init(argc, argv))
+		return 0;
+	for (agno = 0; agno < file->geom.agcount; agno++)  {
+		if (inaglist(agno))
+			scan_ag(agno);
+	}
+	if (histcount)
+		printhist();
+	if (summaryflag) {
+		printf(_("total free extents %lld\n"), totexts);
+		printf(_("total free blocks %lld\n"), totblocks);
+		printf(_("average free extent size %g\n"),
+			(double)totblocks / (double)totexts);
+	}
+	if (aglist)
+		free(aglist);
+	if (hist)
+		free(hist);
+	return 0;
+}
+
+static void
+freesp_help(void)
+{
+	printf(_(
+"\n"
+"Examine filesystem free space\n"
+"\n"
+"Options: [-bcds] [-a agno] [-e bsize] [-h h1]... [-m bmult]\n"
+"\n"
+" -b -- binary histogram bin size\n"
+" -c -- scan the by-count (size) ordered freespace tree\n"
+" -d -- debug output\n"
+" -s -- emit freespace summary information\n"
+" -a agno -- scan only the given AG agno\n"
+" -e bsize -- use fixed histogram bin size of bsize\n"
+" -h h1 -- use custom histogram bin size of h1. Multiple specifications allowed.\n"
+" -m bmult -- use histogram bin size multiplier of bmult\n"
+"\n"));
+
+}
+
+void
+freesp_init(void)
+{
+	freesp_cmd.name = "freesp";
+	freesp_cmd.altname = "fsp";
+	freesp_cmd.cfunc = freesp_f;
+	freesp_cmd.argmin = 0;
+	freesp_cmd.argmax = -1;
+	freesp_cmd.args = "[-bcds] [-a agno] [-e bsize] [-h h1]... [-m bmult]\n";
+	freesp_cmd.flags = CMD_FLAG_GLOBAL;
+	freesp_cmd.oneline = _("Examine filesystem free space");
+	freesp_cmd.help = freesp_help;
+
+	add_command(&freesp_cmd);
+}
+
diff --git a/spaceman/init.c b/spaceman/init.c
new file mode 100644
index 0000000..108dcd7
--- /dev/null
+++ b/spaceman/init.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2012 Red Hat, Inc
+ * 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 <xfs/xfs.h>
+#include <xfs/command.h>
+#include <xfs/input.h>
+#include "init.h"
+#include "space.h"
+
+char	*progname;
+int	exitcode;
+
+void
+usage(void)
+{
+	fprintf(stderr,
+		_("Usage: %s [-c cmd] file\n"),
+		progname);
+	exit(1);
+}
+
+static void
+init_commands(void)
+{
+	file_init();
+	freesp_init();
+	help_init();
+	quit_init();
+}
+
+static int
+init_args_command(
+	int	index)
+{
+	if (index >= filecount)
+		return 0;
+	file = &filetable[index++];
+	return index;
+}
+
+static int
+init_check_command(
+	const cmdinfo_t	*ct)
+{
+	if (!(ct->flags & CMD_FLAG_GLOBAL))
+		return 0;
+	return 1;
+}
+
+void
+init(
+	int		argc,
+	char		**argv)
+{
+	int		c, flags = 0;
+	mode_t		mode = 0600;
+	xfs_fsop_geom_t	geometry = { 0 };
+
+	progname = basename(argv[0]);
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+
+	while ((c = getopt(argc, argv, "c:V")) != EOF) {
+		switch (c) {
+		case 'c':
+			add_user_command(optarg);
+			break;
+		case 'V':
+			printf(_("%s version %s\n"), progname, VERSION);
+			exit(0);
+		default:
+			usage();
+		}
+	}
+
+	while (optind < argc) {
+		if ((c = openfile(argv[optind], &geometry, flags, mode)) < 0)
+			exit(1);
+		if (!platform_test_xfs_fd(c)) {
+			printf(_("Not an XFS filesystem!\n"));
+			exit(1);
+		}
+		if (addfile(argv[optind], c, &geometry, flags) < 0)
+			exit(1);
+		optind++;
+	}
+
+	init_commands();
+	add_args_command(init_args_command);
+	add_check_command(init_check_command);
+}
+
+int
+main(
+	int	argc,
+	char	**argv)
+{
+	init(argc, argv);
+	command_loop();
+	return exitcode;
+}
diff --git a/spaceman/init.h b/spaceman/init.h
new file mode 100644
index 0000000..ecd0b5d
--- /dev/null
+++ b/spaceman/init.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2012 Red Hat, Inc.
+ * 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
+ */
+
+extern char	*progname;
+extern int	exitcode;
+
+#define min(a,b)	(((a)<(b))?(a):(b))
+#define max(a,b)	(((a)>(b))?(a):(b))
+
diff --git a/spaceman/space.h b/spaceman/space.h
new file mode 100644
index 0000000..c6a63fe
--- /dev/null
+++ b/spaceman/space.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2012 Red Hat, Inc.
+ * 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
+ */
+
+typedef struct fileio {
+	int		fd;		/* open file descriptor */
+	int		flags;		/* flags describing file state */
+	char		*name;		/* file name at time of open */
+	xfs_fsop_geom_t	geom;		/* XFS filesystem geometry */
+} fileio_t;
+
+extern fileio_t		*filetable;	/* open file table */
+extern int		filecount;	/* number of open files */
+extern fileio_t		*file;		/* active file in file table */
+extern int filelist_f(void);
+
+extern int	openfile(char *, xfs_fsop_geom_t *, int, mode_t);
+extern int	addfile(char *, int , xfs_fsop_geom_t *, int);
+
+extern void	file_init(void);
+extern void	help_init(void);
+extern void	quit_init(void);
+extern void	freesp_init(void);
--
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