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Message-ID: <148843034776.21733.3790987196585797215.stgit@birch.djwong.org>
Date: Wed, 01 Mar 2017 20:52:27 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 3/3] e2spacey: create a program to use getfsmap to profile
free space
From: Darrick J. Wong <darrick.wong@...cle.com>
e2spacey is a new tool that uses the GETFSMAP ioctl and the FSGEOMETRY
ioctl to find all the free extents in a mounted filesystem and display
either per-flexbg free block counts or a histogram of free extents.
At this point it's mostly useful as a debugging tool.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
Makefile.in | 3
configure | 6 +
configure.ac | 5 -
lib/ext2fs/ext2_fs.h | 8 +
spacey/Makefile.in | 152 +++++++++++++++++
spacey/e2spacey.8.in | 65 +++++++
spacey/fsmap.h | 89 ++++++++++
spacey/main.c | 456 ++++++++++++++++++++++++++++++++++++++++++++++++++
8 files changed, 781 insertions(+), 3 deletions(-)
create mode 100644 spacey/Makefile.in
create mode 100644 spacey/e2spacey.8.in
create mode 100644 spacey/fsmap.h
create mode 100644 spacey/main.c
diff --git a/Makefile.in b/Makefile.in
index 7da9ad7..b48d0f9 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -13,10 +13,11 @@ INSTALL = @INSTALL@
@DEBUGFS_CMT@...UGFS_DIR= debugfs
@UUID_CMT@...D_LIB_SUBDIR= lib/uuid
@BLKID_CMT@...ID_LIB_SUBDIR= lib/blkid
+@...CEY_CMT@...CEY_DIR= spacey
SUPPORT_LIB_SUBDIR= lib/support
LIB_SUBDIRS=lib/et lib/ss lib/e2p $(UUID_LIB_SUBDIR) $(BLKID_LIB_SUBDIR) $(SUPPORT_LIB_SUBDIR) lib/ext2fs intl
-PROG_SUBDIRS=e2fsck $(DEBUGFS_DIR) misc $(RESIZE_DIR) tests/progs po
+PROG_SUBDIRS=e2fsck $(DEBUGFS_DIR) misc $(RESIZE_DIR) tests/progs po $(SPACEY_DIR)
SUBDIRS=util $(LIB_SUBDIRS) $(PROG_SUBDIRS) tests
SUBS= util/subst.conf lib/config.h $(top_builddir)/lib/dirpaths.h \
diff --git a/configure b/configure
index b553da1..940b11c 100755
--- a/configure
+++ b/configure
@@ -642,6 +642,7 @@ root_prefix
UNIX_CMT
CYGWIN_CMT
LINUX_CMT
+SPACEY_CMT
E2INFO_CMT
UNI_DIFF_OPTS
SEM_INIT_LIB
@@ -13665,15 +13666,18 @@ fi
$as_echo "$UNI_DIFF_OPTS" >&6; }
E2INFO_CMT="#"
+SPACEY_CMT="#"
case "$host_os" in
linux*)
$as_echo "#define HAVE_EXT2_IOCTLS 1" >>confdefs.h
E2INFO_CMT=
+ SPACEY_CMT=
;;
esac
+
LINUX_CMT="#"
CYGWIN_CMT="#"
UNIX_CMT=
@@ -13875,7 +13879,7 @@ for i in MCONFIG Makefile e2fsprogs.spec \
misc/Makefile ext2ed/Makefile e2fsck/Makefile \
debugfs/Makefile tests/Makefile tests/progs/Makefile \
resize/Makefile doc/Makefile intl/Makefile \
- intl/libgnuintl.h po/Makefile.in ; do
+ intl/libgnuintl.h po/Makefile.in spacey/Makefile ; do
if test -d `dirname ${srcdir}/$i` ; then
outlist="$outlist $i"
fi
diff --git a/configure.ac b/configure.ac
index bf613fd..5b95f6b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1261,13 +1261,16 @@ dnl
dnl We use the EXT2 ioctls only under Linux
dnl
E2INFO_CMT="#"
+SPACEY_CMT="#"
case "$host_os" in
linux*)
AC_DEFINE(HAVE_EXT2_IOCTLS, 1, [Define to 1 if Ext2 ioctls present])
E2INFO_CMT=
+ SPACEY_CMT=
;;
esac
AC_SUBST(E2INFO_CMT)
+AC_SUBST(SPACEY_CMT)
dnl
dnl OS-specific uncomment control
dnl
@@ -1469,7 +1472,7 @@ for i in MCONFIG Makefile e2fsprogs.spec \
misc/Makefile ext2ed/Makefile e2fsck/Makefile \
debugfs/Makefile tests/Makefile tests/progs/Makefile \
resize/Makefile doc/Makefile intl/Makefile \
- intl/libgnuintl.h po/Makefile.in ; do
+ intl/libgnuintl.h po/Makefile.in spacey/Makefile ; do
if test -d `dirname ${srcdir}/$i` ; then
outlist="$outlist $i"
fi
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index bad7648..4beebb6 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -406,6 +406,14 @@ struct ext4_fsop_geom {
#define EXT4_IOC_FSGEOMETRY _IOR ('f', 19, struct ext4_fsop_geom)
+/* Custom FS_IOC_GETFSMAP owner codes */
+#define EXT4_FMR_OWN_FREE FMR_OWN_FREE /* free space */
+#define EXT4_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */
+#define EXT4_FMR_OWN_GDT FMR_OWNER('f', 1) /* group descriptors */
+#define EXT4_FMR_OWN_RESV_GDT FMR_OWNER('f', 2) /* reserved gdt blocks */
+#define EXT4_FMR_OWN_BLKBM FMR_OWNER('f', 3) /* inode bitmap */
+#define EXT4_FMR_OWN_INOBM FMR_OWNER('f', 4) /* block bitmap */
+
/*
* Structure of an inode on the disk
*/
diff --git a/spacey/Makefile.in b/spacey/Makefile.in
new file mode 100644
index 0000000..3c842f3
--- /dev/null
+++ b/spacey/Makefile.in
@@ -0,0 +1,152 @@
+#
+# Makefile for e2spacey
+#
+
+srcdir = @srcdir@
+top_srcdir = @top_srcdir@
+VPATH = @srcdir@
+top_builddir = ..
+my_dir = scrub
+INSTALL = @INSTALL@
+
+@...NFIG@
+
+PROGS= e2spacey
+MANPAGES= e2spacey.8
+
+LIBS= $(LIBSUPPORT) $(LIBEXT2FS) $(LIBCOM_ERR) $(LIBBLKID) $(LIBUUID) \
+ $(LIBINTL) $(LIBE2P) $(LIBMAGIC) $(SYSLIBS)
+DEPLIBS= $(DEPLIBSUPPORT) $(LIBEXT2FS) $(DEPLIBCOM_ERR) $(DEPLIBBLKID) \
+ $(DEPLIBUUID) $(DEPLIBE2P)
+
+STATIC_LIBS= $(STATIC_LIBSUPPORT) $(STATIC_LIBEXT2FS) $(STATIC_LIBCOM_ERR) \
+ $(STATIC_LIBBLKID) $(STATIC_LIBUUID) $(LIBINTL) $(STATIC_LIBE2P) \
+ $(LIBMAGIC) $(SYSLIBS)
+STATIC_DEPLIBS= $(DEPSTATIC_LIBSUPPORT) $(STATIC_LIBEXT2FS) \
+ $(DEPSTATIC_LIBCOM_ERR) $(DEPSTATIC_LIBBLKID) \
+ $(DEPSTATIC_LIBUUID) $(DEPSTATIC_LIBE2P)
+
+PROFILED_LIBS= $(PROFILED_LIBSUPPORT) $(PROFILED_LIBEXT2FS) \
+ $(PROFILED_LIBCOM_ERR) $(PROFILED_LIBBLKID) $(PROFILED_LIBUUID) \
+ $(PROFILED_LIBE2P) $(LIBINTL) $(LIBMAGIC) $(SYSLIBS)
+PROFILED_DEPLIBS= $(DEPPROFILED_LIBSUPPORT) $(PROFILED_LIBEXT2FS) \
+ $(DEPPROFILED_LIBCOM_ERR) $(DEPPROFILED_LIBBLKID) \
+ $(DEPPROFILED_LIBUUID) $(DEPPROFILED_LIBE2P)
+
+COMPILE_ET= _ET_DIR_OVERRIDE=$(srcdir)/../lib/et/et ../lib/et/compile_et
+
+.c.o:
+ $(E) " CC $<"
+ $(Q) $(CC) -c $(ALL_CFLAGS) $< -o $@
+ $(Q) $(CHECK_CMD) $(ALL_CFLAGS) $<
+ $(Q) $(CPPCHECK_CMD) $(CPPFLAGS) $<
+@...FILE_CMT@ $(Q) $(CC) $(ALL_CFLAGS) -g -pg -o profiled/$*.o -c $<
+
+#
+# Flags for doing mtrace --- uncomment to produce mtracing e2spacey
+# Note: The optimization flags must include -g
+#
+#MTRACE= -DMTRACE
+#MTRACE_OBJ= mtrace.o
+#MTRACE_SRC= $(srcdir)/mtrace.c
+#OPT= -g
+
+#
+# Flags for doing mcheck --- uncomment to produce mchecking e2spacey
+# Note: The optimization flags must include -g
+#
+#MCHECK= -DMCHECK
+
+OBJS= main.o
+
+PROFILED_OBJS= profiled/main.o
+
+SRCS= $(srcdir)/main.o
+
+all:: profiled $(PROGS) $(MANPAGES)
+
+@...FILE_CMT@all:: e2spacey.profiled
+
+e2spacey: $(OBJS) $(DEPLIBS)
+ $(E) " LD $@"
+ $(Q) $(LD) $(ALL_LDFLAGS) $(RDYNAMIC) -o e2spacey $(OBJS) $(LIBS)
+
+e2spacey.static: $(OBJS) $(STATIC_DEPLIBS)
+ $(E) " LD $@"
+ $(Q) $(LD) $(LDFLAGS_STATIC) -o e2spacey.static $(OBJS) $(STATIC_LIBS) -lpthread
+
+e2spacey.profiled: $(OBJS) $(PROFILED_DEPLIBS)
+ $(E) " LD $@"
+ $(Q) $(LD) $(ALL_LDFLAGS) -g -pg -o e2spacey.profiled $(PROFILED_OBJS) \
+ $(PROFILED_LIBS) -lpthread
+
+test_profile: $(srcdir)/profile.c profile_helpers.o argv_parse.o \
+ prof_err.o profile.h $(DEPSTATIC_LIBCOM_ERR)
+ $(E) " LD $@"
+ $(Q) $(CC) -o test_profile -DDEBUG_PROGRAM $(srcdir)/profile.c prof_err.o \
+ profile_helpers.o argv_parse.o $(STATIC_LIBCOM_ERR) \
+ $(ALL_CFLAGS)
+
+profiled:
+@...FILE_CMT@ $(E) " MKDIR $@"
+@...FILE_CMT@ $(Q) mkdir profiled
+
+e2spacey.8: $(DEP_SUBSTITUTE) $(srcdir)/e2spacey.8.in
+ $(E) " SUBST $@"
+ $(Q) $(SUBSTITUTE_UPTIME) $(srcdir)/e2spacey.8.in e2spacey.8
+
+installdirs:
+ $(E) " MKINSTALLDIRS $(root_sbindir) $(man8dir)"
+ $(Q) $(MKINSTALLDIRS) $(DESTDIR)$(root_sbindir) \
+ $(DESTDIR)$(man8dir) $(DESTDIR)$(man5dir)
+
+install: $(PROGS) $(MANPAGES) $(FMANPAGES) installdirs
+ $(Q) for i in $(PROGS); do \
+ $(ES) " INSTALL $(root_sbindir)/$$i"; \
+ $(INSTALL_PROGRAM) $$i $(DESTDIR)$(root_sbindir)/$$i; \
+ done
+ $(Q) for i in $(MANPAGES); do \
+ for j in $(COMPRESS_EXT); do \
+ $(RM) -f $(DESTDIR)$(man8dir)/$$i.$$j; \
+ done; \
+ $(ES) " INSTALL_DATA $(man8dir)/$$i"; \
+ $(INSTALL_DATA) $$i $(DESTDIR)$(man8dir)/$$i; \
+ done
+
+install-strip: install
+ $(Q) for i in $(PROGS); do \
+ $(ES) " STRIP $(root_sbindir)/$$i"; \
+ $(STRIP) $(DESTDIR)$(root_sbindir)/$$i; \
+ done
+
+uninstall:
+ for i in $(PROGS); do \
+ $(RM) -f $(DESTDIR)$(root_sbindir)/$$i; \
+ done
+ for i in $(MANPAGES); do \
+ $(RM) -f $(DESTDIR)$(man8dir)/$$i; \
+ done
+
+clean::
+ $(RM) -f $(PROGS)
+ $(RM) -rf profiled
+
+mostlyclean: clean
+distclean: clean
+ $(RM) -f .depend Makefile $(srcdir)/TAGS $(srcdir)/Makefile.in.old
+
+# +++ Dependency line eater +++
+#
+# Makefile dependencies follow. This must be the last section in
+# the Makefile.in file
+#
+main.o: $(srcdir)/main.c $(top_builddir)/lib/config.h \
+ $(top_builddir)/lib/dirpaths.h $(srcdir)/fsmap.h \
+ $(top_srcdir)/lib/ext2fs/ext2_fs.h $(top_builddir)/lib/ext2fs/ext2_types.h \
+ $(top_srcdir)/lib/ext2fs/ext2fs.h $(top_srcdir)/lib/ext2fs/ext3_extents.h \
+ $(top_srcdir)/lib/et/com_err.h $(top_srcdir)/lib/ext2fs/ext2_io.h \
+ $(top_builddir)/lib/ext2fs/ext2_err.h \
+ $(top_srcdir)/lib/ext2fs/ext2_ext_attr.h $(top_srcdir)/lib/ext2fs/bitops.h \
+ $(top_srcdir)/lib/support/profile.h $(top_builddir)/lib/support/prof_err.h \
+ $(top_srcdir)/lib/support/quotaio.h $(top_srcdir)/lib/support/dqblk_v2.h \
+ $(top_srcdir)/lib/support/quotaio_tree.h
diff --git a/spacey/e2spacey.8.in b/spacey/e2spacey.8.in
new file mode 100644
index 0000000..f4956fc
--- /dev/null
+++ b/spacey/e2spacey.8.in
@@ -0,0 +1,65 @@
+.TH E2SPACEY 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
+.SH NAME
+e2spacey \- show free space information about an ext4 filesystem
+.SH SYNOPSIS
+.B e2spacey
+[
+.B \-srg
+]
+[
+.B \-b
+|
+.B \-e
+.I bsize
+|
+.B \-h
+.I h1
+[
+.B \-m
+.I bmult
+]
+]
+[
+.B \-a
+.I group
+]
+.I mountpoint
+.br
+.B e2spacey \-V
+.SH DESCRIPTION
+.B e2spacey
+reports and controls free space usage in an ext4 filesystem.
+When the
+.B flex_bg
+feature is enabled, the free space information is grouped by flex block groups
+instead of regular block groups.
+This enables reporting of free space extents that span multiple block groups.
+
+.SH OPTIONS
+.TP 1.0i
+.BI \-a " group"
+Only query the specified block group's free space information.
+Multiple options may be provided.
+.TP
+.B \-b
+Establish histogram bins sized in successive powers of two.
+.TP
+.B \-e
+Fix the histogram bin size to a specific value.
+.TP
+.B \-g
+Instead of printing a histogram, simply report the number of free extents
+and number of free blocks per block group.
+.TP
+.BI \-h " hist"
+Fix the histogram bin size to a specific initial value.
+Use this in comination with the
+.B \-m
+option to specify a custom histgram bin size growth function.
+.TP
+.BI \-m " mult"
+The size of each histogram bin should be computed by multiplying the
+previous bin's size by this quantity.
+.TP
+.B \-s
+Print a summary of the free space before exiting.
diff --git a/spacey/fsmap.h b/spacey/fsmap.h
new file mode 100644
index 0000000..3c5084c
--- /dev/null
+++ b/spacey/fsmap.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2017 Oracle.
+ * All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@...cle.com>
+ *
+ * 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
+ */
+#ifndef FSMAP_H_
+#define FSMAP_H_
+
+/* FS_IOC_GETFSMAP ioctl definitions */
+#ifndef FS_IOC_GETFSMAP
+struct fsmap {
+ __u32 fmr_device; /* device id */
+ __u32 fmr_flags; /* mapping flags */
+ __u64 fmr_physical; /* device offset of segment */
+ __u64 fmr_owner; /* owner id */
+ __u64 fmr_offset; /* file offset of segment */
+ __u64 fmr_length; /* length of segment */
+ __u64 fmr_reserved[3]; /* must be zero */
+};
+
+struct fsmap_head {
+ __u32 fmh_iflags; /* control flags */
+ __u32 fmh_oflags; /* output flags */
+ __u32 fmh_count; /* # of entries in array incl. input */
+ __u32 fmh_entries; /* # of entries filled in (output). */
+ __u64 fmh_reserved[6]; /* must be zero */
+
+ struct fsmap fmh_keys[2]; /* low and high keys for the mapping search */
+ struct fsmap fmh_recs[]; /* returned records */
+};
+
+/* Size of an fsmap_head with room for nr records. */
+static inline size_t
+fsmap_sizeof(
+ unsigned int nr)
+{
+ return sizeof(struct fsmap_head) + nr * sizeof(struct fsmap);
+}
+
+/* Start the next fsmap query at the end of the current query results. */
+static inline void
+fsmap_advance(
+ struct fsmap_head *head)
+{
+ head->fmh_keys[0] = head->fmh_recs[head->fmh_entries - 1];
+}
+
+/* fmh_iflags values - set by FS_IOC_GETFSMAP caller in the header. */
+/* no flags defined yet */
+#define FMH_IF_VALID 0
+
+/* fmh_oflags values - returned in the header segment only. */
+#define FMH_OF_DEV_T 0x1 /* fmr_device values will be dev_t */
+
+/* fmr_flags values - returned for each non-header segment */
+#define FMR_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */
+#define FMR_OF_ATTR_FORK 0x2 /* segment = attribute fork */
+#define FMR_OF_EXTENT_MAP 0x4 /* segment = extent map */
+#define FMR_OF_SHARED 0x8 /* segment = shared with another file */
+#define FMR_OF_SPECIAL_OWNER 0x10 /* owner is a special value */
+#define FMR_OF_LAST 0x20 /* segment is the last in the FS */
+
+/* Each FS gets to define its own special owner codes. */
+#define FMR_OWNER(type, code) (((__u64)type << 32) | \
+ ((__u64)code & 0xFFFFFFFFULL))
+#define FMR_OWNER_TYPE(owner) ((__u32)((__u64)owner >> 32))
+#define FMR_OWNER_CODE(owner) ((__u32)(((__u64)owner & 0xFFFFFFFFULL)))
+#define FMR_OWN_FREE FMR_OWNER(0, 1) /* free space */
+#define FMR_OWN_UNKNOWN FMR_OWNER(0, 2) /* unknown owner */
+#define FMR_OWN_METADATA FMR_OWNER(0, 3) /* metadata */
+
+#define FS_IOC_GETFSMAP _IOWR('X', 59, struct fsmap_head)
+#endif /* FS_IOC_GETFSMAP */
+
+#endif
diff --git a/spacey/main.c b/spacey/main.c
new file mode 100644
index 0000000..009a965
--- /dev/null
+++ b/spacey/main.c
@@ -0,0 +1,456 @@
+/*
+ * Copyright (c) 2017 Oracle.
+ * All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@...cle.com>
+ *
+ * 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 "config.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <libgen.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <mntent.h>
+#include <limits.h>
+#include "ext2fs/ext2_types.h"
+#include "ext2fs/ext2fs.h"
+#include "fsmap.h"
+#include "ext2fs/ext2_fs.h"
+
+#include "../version.h"
+#include "support/nls-enable.h"
+
+static const char *progname = "e2spaceman";
+
+struct histent
+{
+ blk64_t low;
+ blk64_t high;
+ size_t count;
+ blk64_t blocks;
+};
+
+static struct ext4_fsop_geom fsgeo;
+static struct ext4_fsop_geom flexgeo;
+
+static struct histent *hist;
+static size_t histcount;
+
+static dgrp_t *bglist;
+static size_t bgcount;
+
+static blk64_t totblocks;
+static long long totexts;
+
+static int equalsize;
+static int multsize;
+
+static int seen1;
+static int dumpflag;
+static int gflag;
+static const char *filename;
+static dev_t datadev;
+
+static inline dgrp_t f2b(dgrp_t fgroup)
+{
+ return fsgeo.efg_flexbgsize ? fgroup * fsgeo.efg_flexbgsize : fgroup;
+}
+
+static inline dgrp_t b2f(dgrp_t group)
+{
+ return fsgeo.efg_flexbgsize ? group / fsgeo.efg_flexbgsize : group;
+}
+
+static void usage(void)
+{
+ fprintf(stderr, _(
+"Usage: %s [options] mountpoint\n\n\
+ -V print version information\n"),
+ progname);
+ exit(2);
+}
+
+#define PROC_MOUNTS "/proc/mounts"
+int find_datadev(const char *arg, dev_t *datadev, char *mntpoint)
+{
+ struct mntent *mnt;
+ FILE *mtp;
+ char *mtab_file;
+ char rmnt_fsname[PATH_MAX], rmnt_dir[PATH_MAX];
+ struct stat sbuf;
+ dev_t fd_dev;
+
+ if (stat(arg, &sbuf) < 0)
+ return errno;
+ /*
+ * We want to match st_rdev if the path provided is a device
+ * special file. Otherwise we are looking for the the
+ * device id for the containing filesystem, in st_dev.
+ */
+ if (S_ISBLK(sbuf.st_mode) || S_ISCHR(sbuf.st_mode))
+ fd_dev = sbuf.st_rdev;
+ else
+ fd_dev = sbuf.st_dev;
+
+ mtab_file = PROC_MOUNTS;
+ if (access(mtab_file, R_OK) != 0)
+ mtab_file = MOUNTED;
+
+ if ((mtp = setmntent(mtab_file, "r")) == NULL)
+ return ENOENT;
+
+ while ((mnt = getmntent(mtp)) != NULL) {
+ if (!realpath(mnt->mnt_dir, rmnt_dir))
+ continue;
+ if (!realpath(mnt->mnt_fsname, rmnt_fsname))
+ continue;
+
+ if (stat(rmnt_fsname, &sbuf) < 0)
+ continue;
+ if (sbuf.st_rdev == fd_dev) {
+ *datadev = fd_dev;
+ strncpy(mntpoint, rmnt_dir, PATH_MAX);
+ break;
+ }
+ }
+ endmntent(mtp);
+ return 0;
+}
+
+static void addhistent(blk64_t h)
+{
+ hist = realloc(hist, (histcount + 1) * sizeof(*hist));
+ if (!hist) {
+ perror("addhistent");
+ exit(2);
+ }
+ 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(dgrp_t group, blk64_t fsb, blk64_t len)
+{
+ size_t i;
+
+ if (dumpflag)
+ printf("%8u %8llu %8llu\n", group, fsb, 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 ((struct histent *)a)->low - ((struct histent *)b)->low;
+}
+
+static void histinit(blk64_t maxlen)
+{
+ blk64_t 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)
+{
+ size_t i;
+
+ printf("%7s %7s %7s %7s %6s\n",
+ _("from"), _("to"), _("extents"), _("blocks"), _("pct"));
+ for (i = 0; i < histcount; i++) {
+ if (hist[i].count)
+ printf("%7llu %7llu %7Zu %7llu %6.2f\n", hist[i].low,
+ hist[i].high, hist[i].count, hist[i].blocks,
+ hist[i].blocks * 100.0 / totblocks);
+ }
+}
+
+static int inbglist(dgrp_t fgroup)
+{
+ size_t i;
+
+ if (bgcount == 0)
+ return 1;
+ for (i = 0; i < bgcount; i++)
+ if (b2f(bglist[i]) == fgroup)
+ return 1;
+ return 0;
+}
+
+#define NR_EXTENTS 1024
+
+static void scan_bg(int fd, dgrp_t fgroup)
+{
+ struct fsmap_head *fsmap;
+ struct fsmap *extent;
+ struct fsmap *l, *h;
+ struct fsmap *p;
+ off64_t blocksize = flexgeo.efg_blocksize;
+ off64_t bytes_per_bg;
+ off64_t len;
+ blk64_t fsb;
+ blk64_t freeblks = 0;
+ blk64_t freeexts = 0;
+ int ret;
+ int i;
+
+ bytes_per_bg = (off64_t)flexgeo.efg_bgblocks * blocksize;
+
+ fsmap = malloc(fsmap_sizeof(NR_EXTENTS));
+ if (!fsmap) {
+ fprintf(stderr, _("%s: fsmap malloc failed.\n"), progname);
+ exit(1);
+ }
+
+ memset(fsmap, 0, sizeof(*fsmap));
+ fsmap->fmh_count = NR_EXTENTS;
+ l = fsmap->fmh_keys;
+ h = fsmap->fmh_keys + 1;
+ l->fmr_physical = fgroup * bytes_per_bg;
+ h->fmr_physical = ((fgroup + 1) * bytes_per_bg) - 1;
+ l->fmr_device = h->fmr_device = datadev;
+ h->fmr_owner = ULLONG_MAX;
+ h->fmr_flags = UINT_MAX;
+ h->fmr_offset = ULLONG_MAX;
+
+ while (1) {
+ ret = ioctl(fd, FS_IOC_GETFSMAP, fsmap);
+ if (ret < 0) {
+ fprintf(stderr,
+_("%s: FS_IOC_GETFSMAP [\"%s\"]: %s\n"),
+ progname, filename, strerror(errno));
+ free(fsmap);
+ exit(1);
+ }
+
+ /* No more extents to map, exit */
+ if (!fsmap->fmh_entries)
+ break;
+
+ for (i = 0, extent = fsmap->fmh_recs;
+ i < fsmap->fmh_entries;
+ i++, extent++) {
+ if (!(extent->fmr_flags & FMR_OF_SPECIAL_OWNER) ||
+ extent->fmr_owner != FMR_OWN_FREE)
+ continue;
+
+ fsb = extent->fmr_physical / blocksize;
+ len = extent->fmr_length / blocksize;
+ freeblks += len;
+ freeexts++;
+
+ addtohist(f2b(fgroup), fsb, len);
+ }
+
+ p = &fsmap->fmh_recs[fsmap->fmh_entries - 1];
+ if (p->fmr_flags & FMR_OF_LAST)
+ break;
+ fsmap_advance(fsmap);
+ }
+
+ if (gflag)
+ printf(_("%10u %10llu %10llu\n"), f2b(fgroup), freeexts,
+ freeblks);
+}
+
+static void bglistadd(char *a)
+{
+ bglist = realloc(bglist, (bgcount + 1) * sizeof(*bglist));
+ bglist[bgcount] = (dgrp_t)atoi(a);
+ bgcount++;
+}
+
+
+static void setup_fsgeo(int fd)
+{
+ /* Get the current filesystem size & geometry */
+ if (ioctl(fd, EXT4_IOC_FSGEOMETRY, &fsgeo) < 0) {
+ fprintf(stderr, _(
+ "%s: cannot determine geometry of ext4 filesystem"
+ " mounted at %s.\n"),
+ progname, filename);
+ exit(1);
+ }
+
+ /*
+ * Refactor the geometry so that a "group" is the size of the smallest
+ * number of BGs required to contain the longest free extent possible.
+ *
+ * (IOWs, we handle everything in terms of flexbgs.)
+ */
+ flexgeo = fsgeo;
+ if (fsgeo.efg_flexbgsize) {
+ flexgeo.efg_bgblocks *= fsgeo.efg_flexbgsize;
+ flexgeo.efg_bgcount = (fsgeo.efg_bgcount +
+ fsgeo.efg_flexbgsize - 1) /
+ fsgeo.efg_flexbgsize;
+ flexgeo.efg_bg_iblocks *= fsgeo.efg_flexbgsize;
+ flexgeo.efg_flexbgsize = 0;
+ }
+}
+
+int main(int argc, char **argv)
+{
+ char *progname;
+ int fd;
+ int c;
+ char mntpoint[PATH_MAX];
+ blk64_t max_extent;
+ int speced, summaryflag;
+ dgrp_t fgroup;
+
+ speced = dumpflag = summaryflag = gflag = 0;
+
+ progname = basename(argv[0]);
+#ifdef ENABLE_NLS
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+#endif
+
+ while ((c = getopt(argc, argv, "a:bde:gh:m:sV")) != EOF) {
+ switch (c) {
+ case 'a':
+ bglistadd(optarg);
+ break;
+ case 'b':
+ if (speced)
+ return 0;
+ multsize = 2;
+ speced = 1;
+ break;
+ case 'd':
+ dumpflag = 1;
+ break;
+ case 'e':
+ if (speced)
+ return 0;
+ equalsize = atoi(optarg);
+ speced = 1;
+ break;
+ case 'g':
+ histcount = 0;
+ gflag++;
+ 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 'V':
+ printf(_("%s version %s\n"), progname, VERSION);
+ exit(0);
+ case '?':
+ default:
+ usage();
+ }
+ }
+ if (argc - optind != 1)
+ usage();
+
+ filename = argv[optind];
+ fd = open(argv[optind], O_RDONLY);
+ if (fd < 0) {
+ perror(argv[optind]);
+ return 1;
+ }
+
+ if (find_datadev(argv[optind], &datadev, mntpoint)) {
+ perror("find_datadev");
+ exit(1);
+ }
+
+ close(fd);
+ fd = open(mntpoint, O_RDONLY);
+ if (fd < 0) {
+ perror(mntpoint);
+ return 1;
+ }
+
+ setup_fsgeo(fd);
+
+ /* Set up histogram */
+ max_extent = flexgeo.efg_bgblocks;
+
+ if (!speced)
+ multsize = 2;
+ histinit(max_extent);
+
+ /* Collect data and print */
+ if (gflag)
+ printf(_(" AG extents blocks\n"));
+ for (fgroup = 0; fgroup < flexgeo.efg_bgcount; fgroup++) {
+ if (inbglist(fgroup))
+ scan_bg(fd, fgroup);
+ }
+ if (histcount && !gflag)
+ 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 (bglist)
+ free(bglist);
+ if (hist)
+ free(hist);
+ close(fd);
+
+ return 0;
+}
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