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Date: Wed, 01 Mar 2017 20:52:19 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 2/3] e2info: create a tool to display ext4 fs geometry online
From: Darrick J. Wong <darrick.wong@...cle.com>
Create e2info, which reports the fs geometry of an online ext4 filesystem.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
configure | 4 +
configure.ac | 3 +
lib/ext2fs/ext2_fs.h | 34 ++++++++
misc/Makefile.in | 30 ++++++-
misc/e2info.8.in | 64 ++++++++++++++++
misc/e2info.c | 205 ++++++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 336 insertions(+), 4 deletions(-)
create mode 100644 misc/e2info.8.in
create mode 100644 misc/e2info.c
diff --git a/configure b/configure
index 5f7b429..b553da1 100755
--- a/configure
+++ b/configure
@@ -642,6 +642,7 @@ root_prefix
UNIX_CMT
CYGWIN_CMT
LINUX_CMT
+E2INFO_CMT
UNI_DIFF_OPTS
SEM_INIT_LIB
FUSE_CMT
@@ -13663,13 +13664,16 @@ fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $UNI_DIFF_OPTS" >&5
$as_echo "$UNI_DIFF_OPTS" >&6; }
+E2INFO_CMT="#"
case "$host_os" in
linux*)
$as_echo "#define HAVE_EXT2_IOCTLS 1" >>confdefs.h
+ E2INFO_CMT=
;;
esac
+
LINUX_CMT="#"
CYGWIN_CMT="#"
UNIX_CMT=
diff --git a/configure.ac b/configure.ac
index 9da7b86..bf613fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1260,11 +1260,14 @@ AC_SUBST(UNI_DIFF_OPTS)
dnl
dnl We use the EXT2 ioctls only under Linux
dnl
+E2INFO_CMT="#"
case "$host_os" in
linux*)
AC_DEFINE(HAVE_EXT2_IOCTLS, 1, [Define to 1 if Ext2 ioctls present])
+ E2INFO_CMT=
;;
esac
+AC_SUBST(E2INFO_CMT)
dnl
dnl OS-specific uncomment control
dnl
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index 27a7d3a..bad7648 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -372,6 +372,40 @@ struct ext4_new_group_input {
#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
+/* ext4 fs geometry. */
+struct ext4_fsop_geom {
+ __u32 efg_blocksize; /* filesystem (data) block size */
+ __u32 efg_bgblocks; /* fsblocks in an AG */
+ __u32 efg_bgcount; /* number of allocation groups */
+ __u32 efg_logblocks; /* fsblocks in the log */
+ __u32 efg_resvblocks; /* number of reserved blocks */
+ __u32 efg_inodesize; /* inode size in bytes */
+ __u32 efg_bg_iblocks; /* inode blocks per AG */
+ __u32 efg_flags; /* superblock version flags */
+ __u64 efg_inodecount; /* inode count */
+ __u64 efg_blockcount; /* fsblocks in filesystem */
+ unsigned char efg_uuid[16]; /* unique id of the filesystem */
+ __u32 efg_sunit; /* stripe unit, fsblocks */
+ __u32 efg_swidth; /* stripe width, fsblocks */
+ __u32 efg_clustersize;/* fs cluster size */
+ __u32 efg_flexbgsize; /* number of bg's in a flexbg */
+ __u64 efg_resv[6];
+};
+
+#define EXT4_FSOP_GEOM_FLAGS_ATTR 0x00001 /* extended attr in use */
+#define EXT4_FSOP_GEOM_FLAGS_NLINK 0x00002 /* 32-bit nlink values */
+#define EXT4_FSOP_GEOM_FLAGS_QUOTA 0x00004 /* quotas enabled */
+#define EXT4_FSOP_GEOM_FLAGS_PROJQ 0x00008 /* project quotas */
+#define EXT4_FSOP_GEOM_FLAGS_META_CSUM 0x00010 /* metadata checksums */
+#define EXT4_FSOP_GEOM_FLAGS_FTYPE 0x00020 /* inode directory types */
+#define EXT4_FSOP_GEOM_FLAGS_64BIT 0x00040 /* 64-bit support */
+#define EXT4_FSOP_GEOM_FLAGS_INLINEDATA 0x00080 /* inline data */
+#define EXT4_FSOP_GEOM_FLAGS_ENCRYPT 0x00100 /* encrypted files */
+#define EXT4_FSOP_GEOM_FLAGS_LARGEDIR 0x00200 /* large directories */
+#define EXT4_FSOP_GEOM_FLAGS_EXTENTS 0x00400 /* extents */
+
+#define EXT4_IOC_FSGEOMETRY _IOR ('f', 19, struct ext4_fsop_geom)
+
/*
* Structure of an inode on the disk
*/
diff --git a/misc/Makefile.in b/misc/Makefile.in
index 467c15d..311aa57 100644
--- a/misc/Makefile.in
+++ b/misc/Makefile.in
@@ -32,14 +32,19 @@ INSTALL = @INSTALL@
@FUSE_CMT@...E_PROG= fuse2fs
+@...NFO_CMT@...NFO_PROG= e2info
+@...NFO_CMT@...NFO_MAN= e2info.8
+
SPROGS= mke2fs badblocks tune2fs dumpe2fs $(BLKID_PROG) logsave \
$(E2IMAGE_PROG) @FSCK_PROG@ e2undo
USPROGS= mklost+found filefrag e2freefrag $(UUIDD_PROG) \
- $(E4DEFRAG_PROG) $(E4CRYPT_PROG) $(FUSE_PROG)
+ $(E4DEFRAG_PROG) $(E4CRYPT_PROG) $(FUSE_PROG) \
+ $(E2INFO_PROG)
SMANPAGES= tune2fs.8 mklost+found.8 mke2fs.8 dumpe2fs.8 badblocks.8 \
e2label.8 $(FINDFS_MAN) $(BLKID_MAN) $(E2IMAGE_MAN) \
logsave.8 filefrag.8 e2freefrag.8 e2undo.8 \
- $(UUIDD_MAN) $(E4DEFRAG_MAN) $(E4CRYPT_MAN) @FSCK_MAN@
+ $(UUIDD_MAN) $(E4DEFRAG_MAN) $(E4CRYPT_MAN) @FSCK_MAN@ \
+ $(E2INFO_MAN)
FMANPAGES= mke2fs.conf.5 ext4.5
UPROGS= chattr lsattr @UUID_CMT@ uuidgen
@@ -68,6 +73,7 @@ E4CRYPT_OBJS= e4crypt.o
E2FREEFRAG_OBJS= e2freefrag.o
E2FUZZ_OBJS= e2fuzz.o
FUSE2FS_OBJS= fuse2fs.o journal.o recovery.o revoke.o
+E2INFO_OBJS= e2info.o
PROFILED_TUNE2FS_OBJS= profiled/tune2fs.o profiled/util.o
PROFILED_MKLPF_OBJS= profiled/mklost+found.o
@@ -90,8 +96,9 @@ PROFILED_E2FREEFRAG_OBJS= profiled/e2freefrag.o
PROFILED_E2UNDO_OBJS= profiled/e2undo.o
PROFILED_E4DEFRAG_OBJS= profiled/e4defrag.o
PROFILED_E4CRYPT_OBJS= profiled/e4crypt.o
-PROFILED_FUSE2FS_OJBS= profiled/fuse2fs.o profiled/journal.o \
+PROFILED_FUSE2FS_OBJS= profiled/fuse2fs.o profiled/journal.o \
profiled/recovery.o profiled/revoke.o
+PROFILED_E2INFO_OBJS= profiled/e2info.o
SRCS= $(srcdir)/tune2fs.c $(srcdir)/mklost+found.c $(srcdir)/mke2fs.c $(srcdir)/mk_hugefiles.c \
$(srcdir)/chattr.c $(srcdir)/lsattr.c $(srcdir)/dumpe2fs.c \
@@ -102,7 +109,7 @@ SRCS= $(srcdir)/tune2fs.c $(srcdir)/mklost+found.c $(srcdir)/mke2fs.c $(srcdir)/
$(srcdir)/e2freefrag.c $(srcdir)/create_inode.c \
$(srcdir)/fuse2fs.c \
$(srcdir)/../debugfs/journal.c $(srcdir)/../e2fsck/revoke.c \
- $(srcdir)/../e2fsck/recovery.c
+ $(srcdir)/../e2fsck/recovery.c $(srcdir)/e2info.c
LIBS= $(LIBEXT2FS) $(LIBCOM_ERR) $(LIBSUPPORT)
DEPLIBS= $(LIBEXT2FS) $(DEPLIBCOM_ERR) $(DEPLIBSUPPORT)
@@ -391,6 +398,11 @@ fuse2fs: $(FUSE2FS_OBJS) $(DEPLIBS) $(DEPLIBBLKID) $(DEPLIBUUID) \
$(LIBFUSE) $(LIBBLKID) $(LIBUUID) $(LIBEXT2FS) $(LIBINTL) \
$(CLOCK_GETTIME_LIB) $(SYSLIBS)
+e2info: $(E2INFO_OBJS) $(DEPLIBS)
+ $(E) " LD $@"
+ $(Q) $(CC) $(ALL_LDFLAGS) -o e2info $(E2INFO_OBJS) $(LIBINTL) \
+ $(SYSLIBS)
+
journal.o: $(srcdir)/../debugfs/journal.c
$(E) " CC $@"
$(Q) $(CC) -c $(JOURNAL_CFLAGS) -I$(srcdir) \
@@ -411,6 +423,10 @@ tst_ismounted: $(srcdir)/ismounted.c $(STATIC_LIBEXT2FS) $(DEPLIBCOM_ERR)
$(CC) -o tst_ismounted $(srcdir)/ismounted.c -DDEBUG $(ALL_CFLAGS) \
$(LIBCOM_ERR) $(SYSLIBS)
+e2info.8: $(DEP_SUBSTITUTE) $(srcdir)/e2info.8.in
+ $(E) " SUBST $@"
+ $(Q) $(SUBSTITUTE_UPTIME) $(srcdir)/e2info.8.in e2info.8
+
tune2fs.8: $(DEP_SUBSTITUTE) $(srcdir)/tune2fs.8.in
$(E) " SUBST $@"
$(Q) $(SUBSTITUTE_UPTIME) $(srcdir)/tune2fs.8.in tune2fs.8
@@ -844,3 +860,9 @@ recovery.o: $(srcdir)/../e2fsck/recovery.c $(srcdir)/../e2fsck/jfs_user.h \
$(top_srcdir)/lib/support/quotaio_tree.h \
$(top_srcdir)/lib/ext2fs/kernel-jbd.h $(top_srcdir)/lib/ext2fs/jfs_compat.h \
$(top_srcdir)/lib/ext2fs/kernel-list.h
+e2info.o: $(srcdir)/e2info.c $(top_builddir)/lib/config.h \
+ $(top_builddir)/lib/dirpaths.h $(top_srcdir)/lib/ext2fs/ext2fs.h \
+ $(top_builddir)/lib/ext2fs/ext2_types.h $(top_srcdir)/lib/ext2fs/ext2_fs.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
diff --git a/misc/e2info.8.in b/misc/e2info.8.in
new file mode 100644
index 0000000..c7f580f
--- /dev/null
+++ b/misc/e2info.8.in
@@ -0,0 +1,64 @@
+.\" -*- nroff -*-
+.\" Copyright 2017 Oracle Inc. All Rights Reserved.
+.\" This file may be copied under the terms of the GNU Public License.
+.\"
+.\" Verbatim blocks taken from openssl req manpage content
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+
+.TH E2INFO 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
+.SH NAME
+e2info \- Display information about a mounted ext4 filesystem
+.SH SYNOPSIS
+.B e2info
+.I mount-point
+.br
+.B e2info \-V
+.SH DESCRIPTION
+Prints the filesystem geometry of an ext4 filesystem. If the mounted
+filesystem is an ext2 or ext3 filesystem mounted with the ext4 driver,
+the geometry will be displayed.
+.SH "EXAMPLES"
+
+Understanding e2info output.
+.PP
+Suppose one has the following "e2info /dev/sda" output:
+.PP
+.RS 2
+.Vb
+\&meta-data=/dev/loop0 isize=256 bgcount=14808 bgsize=32768 blks
+\& = attr=1 quota=0 pquota=0
+\& = crc=0 64bit=0 inlinedata=0 extents=1
+\& = flexbg=16
+\&data = bsize=4096 blocks=485198848 bg_iblocks=512
+\& = sunit=32 swidth=128 blks clustersize=0
+\& = encrypt=0
+\&naming = bsize=4096 largedir=0 ftype=1 nlink=1
+\&log = bsize=4096 blocks=32768
+.Ve
+.RE
+.PP
+
+Here, the data section of the output indicates "bsize=4096",
+meaning the data block size for this filesystem is 4096 bytes.
+This section also shows "sunit=32 swidth=128 blks", which means
+the stripe unit is 32*4096 bytes = 128 kibibytes and the stripe
+width is 128*4096 bytes = 512 kibibytes.
+A single stripe of this filesystem therefore consists
+of four stripe units (128 blocks / 32 blocks per unit).
+Note also that "flexbg=16", which means that this filesystem has
+512MB flex block groups.
+That is the upper limit of how much physical disk space can be mapped
+into a file.
+.SH SEE ALSO
+.BR mkfs.ext4 (8),
+.BR md (4),
+.BR lvm (8),
+.BR mount (8).
diff --git a/misc/e2info.c b/misc/e2info.c
new file mode 100644
index 0000000..675f005
--- /dev/null
+++ b/misc/e2info.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright (c) 2017 Oracle.
+ * 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 "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_fs.h"
+
+#include "../version.h"
+#include "support/nls-enable.h"
+
+static const char *progname = "e2info";
+
+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,
+ char *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) {
+ strncpy(datadev, rmnt_fsname, PATH_MAX);
+ strncpy(mntpoint, rmnt_dir, PATH_MAX);
+ break;
+ }
+ }
+ endmntent(mtp);
+ return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+ struct ext4_fsop_geom geo;
+ char *progname;
+ int fd;
+ int c;
+ int attr_enabled;
+ int nlink_enabled;
+ int quota_enabled;
+ int projquota_enabled;
+ int metacrc_enabled;
+ int ftype_enabled;
+ int is_64bit;
+ int inlinedata_enabled;
+ int encrypt_enabled;
+ int largedir_enabled;
+ int extents_enabled;
+ char datadev[PATH_MAX];
+ char mntpoint[PATH_MAX];
+
+ progname = basename(argv[0]);
+#ifdef ENABLE_NLS
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+#endif
+
+ while ((c = getopt(argc, argv, "V")) != EOF) {
+ switch (c) {
+ case 'V':
+ printf(_("%s version %s\n"), progname, VERSION);
+ exit(0);
+ case '?':
+ default:
+ usage();
+ }
+ }
+ if (argc - optind != 1)
+ usage();
+
+ fd = open(argv[optind], O_RDONLY);
+ if (fd < 0) {
+ perror(argv[optind]);
+ return 1;
+ }
+
+ if (find_datadev(argv[optind], datadev, mntpoint)) {
+ perror("find_datadev");
+ strncpy(datadev, argv[optind], PATH_MAX);
+ strncpy(mntpoint, argv[optind], PATH_MAX);
+ }
+
+ close(fd);
+ fd = open(mntpoint, O_RDONLY);
+ if (fd < 0) {
+ perror(mntpoint);
+ return 1;
+ }
+
+ /* get the current filesystem size & geometry */
+ if (ioctl(fd, EXT4_IOC_FSGEOMETRY, &geo) < 0) {
+ fprintf(stderr, _(
+ "%s: cannot determine geometry of filesystem"
+ " mounted at %s: %s\n"),
+ progname, argv[optind], strerror(errno));
+ exit(1);
+ }
+
+ attr_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_ATTR ? 1 : 0;
+ nlink_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_NLINK ? 1 : 0;
+ quota_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_QUOTA ? 1 : 0;
+ projquota_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_PROJQ ? 1 : 0;
+ metacrc_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_META_CSUM ? 1 : 0;
+ ftype_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_FTYPE ? 1 : 0;
+ is_64bit = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_64BIT ? 1 : 0;
+ inlinedata_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_INLINEDATA ? 1 : 0;
+ encrypt_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_ENCRYPT ? 1 : 0;
+ largedir_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_LARGEDIR ? 1 : 0;
+ extents_enabled = geo.efg_flags & EXT4_FSOP_GEOM_FLAGS_EXTENTS ? 1 : 0;
+
+ printf(_(
+ "meta-data=%-22s isize=%-6u bgcount=%u bgsize=%u blks\n"
+ " =%-22s attr=%-7u quota=%u pquota=%u\n"
+ " =%-22s crc=%-8u 64bit=%u inlinedata=%u extents=%u\n"
+ " =%-22s flexbg=%u\n"
+ "data =%-22s bsize=%-6u blocks=%llu bg_iblocks=%u\n"
+ " =%-22s sunit=%-6u swidth=%u blks clustersize=%u\n"
+ " =%-22s encrypt=%u\n"
+ "naming =%-22s bsize=%-6u largedir=%d ftype=%d nlink=%u\n"
+ "log =%-22s bsize=%-6u blocks=%u\n"),
+ datadev, geo.efg_inodesize, geo.efg_bgcount, geo.efg_bgblocks,
+ "", attr_enabled, quota_enabled, projquota_enabled,
+ "", metacrc_enabled, is_64bit, inlinedata_enabled,
+ extents_enabled,
+ "", geo.efg_flexbgsize,
+ "", geo.efg_blocksize, (unsigned long long)geo.efg_blockcount,
+ geo.efg_bg_iblocks,
+ "", geo.efg_sunit, geo.efg_swidth, geo.efg_clustersize,
+ "", encrypt_enabled,
+ "", geo.efg_blocksize, largedir_enabled, ftype_enabled,
+ nlink_enabled,
+ "", geo.efg_blocksize, geo.efg_logblocks);
+
+ exit(0);
+}
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