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Date: Fri, 02 Oct 2009 11:32:42 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH V3] mke2fs: get device topology values from blkid
Handle automatic selection of stride/stripe:
# misc/mke2fs /dev/md0
mke2fs 1.41.9 (22-Aug-2009)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=16 blocks, Stripe width=32 blocks
...
And warn on block device misalignment:
# misc/mke2fs /dev/sdc1
mke2fs 1.41.9 (22-Aug-2009)
/dev/sdc1 alignment is offset by 32256 bytes.
This may result in very poor performance, (re)-partitioning suggested.
Proceed anyway? (y,n)
V2:
Add blkid_free_probe() per kzak
Add alignment check and warning message for misalignment
V3: use new blkid_new_probe_from_filename to drop some LOC
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
(Note that this will cause the build to fail if the topo stuff is
found in the system's libblkid but the local lib/blkid headers don't
define it; either needs stubs or a library move first).
diff --git a/configure.in b/configure.in
index 4bb5b08..3319f70 100644
--- a/configure.in
+++ b/configure.in
@@ -802,7 +802,11 @@ AC_CHECK_MEMBER(struct sockaddr.sa_len,
[#include <sys/types.h>
#include <sys/socket.h>])
dnl
-AC_CHECK_FUNCS(chflags getrusage llseek lseek64 open64 fstat64 ftruncate64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid usleep nanosleep getdtablesize getrlimit sync_file_range posix_fadvise fallocate)
+dnl This will add -lblkid to the AC_CHECK_FUNCS search
+dnl
+AC_SEARCH_LIBS([blkid_probe_all], [blkid])
+dnl
+AC_CHECK_FUNCS(chflags getrusage llseek lseek64 open64 fstat64 ftruncate64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid usleep nanosleep getdtablesize getrlimit sync_file_range posix_fadvise fallocate blkid_probe_get_topology2)
dnl
dnl Check to see if -lsocket is required (solaris) to make something
dnl that uses socket() to compile; this is needed for the UUID library
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 84c4361..b8f3410 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -49,6 +49,7 @@ extern int optind;
#include <sys/types.h>
#include <libgen.h>
#include <limits.h>
+#include <blkid/blkid.h>
#include "ext2fs/ext2_fs.h"
#include "et/com_err.h"
@@ -614,6 +615,8 @@ static void show_stats(ext2_filsys fs)
s->s_log_block_size);
printf(_("Fragment size=%u (log=%u)\n"), fs->fragsize,
s->s_log_frag_size);
+ printf(_("Stride=%u blocks, Stripe width=%u blocks\n"),
+ s->s_raid_stride, s->s_raid_stripe_width);
printf(_("%u inodes, %u blocks\n"), s->s_inodes_count,
s->s_blocks_count);
printf(_("%u blocks (%2.2f%%) reserved for the super user\n"),
@@ -1073,6 +1076,43 @@ static int get_bool_from_profile(char **fs_types, const char *opt, int def_val)
extern const char *mke2fs_default_profile;
static const char *default_files[] = { "<default>", 0 };
+#ifdef HAVE_BLKID_PROBE_GET_TOPOLOGY
+/*
+ * Sets the geometry of a device (stripe/stride), and returns the
+ * device's alignment offset, if any, or a negative error.
+ */
+static int ext2fs_get_device_geometry(const char *file,
+ struct ext2_super_block *fs_param)
+{
+ int rc = -1;
+ int blocksize;
+ blkid_probe pr;
+ blkid_topology tp;
+ unsigned long min_io;
+ unsigned long opt_io;
+
+ pr = blkid_new_probe_from_filename(file);
+ if (!pr)
+ goto out;
+
+ tp = blkid_probe_get_topology(pr);
+ if (!tp)
+ goto out;
+
+ min_io = blkid_topology_get_minimum_io_size(tp);
+ opt_io = blkid_topology_get_optimal_io_size(tp);
+ blocksize = EXT2_BLOCK_SIZE(fs_param);
+
+ fs_param->s_raid_stride = min_io / blocksize;
+ fs_param->s_raid_stripe_width = opt_io / blocksize;
+
+ rc = blkid_topology_get_alignment_offset(tp);
+out:
+ blkid_free_probe(pr);
+ return rc;
+}
+#endif
+
static void PRS(int argc, char *argv[])
{
int b, c;
@@ -1633,6 +1673,21 @@ got_size:
fs_param.s_log_frag_size = fs_param.s_log_block_size =
int_log2(blocksize >> EXT2_MIN_BLOCK_LOG_SIZE);
+#ifdef HAVE_BLKID_PROBE_GET_TOPOLOGY
+ retval = ext2fs_get_device_geometry(device_name, &fs_param);
+ if (retval < 0) {
+ fprintf(stderr,
+ _("warning: Unable to get device geometry for %s"),
+ device_name);
+ } else if (retval) {
+ printf(_("%s alignment is offset by %lu bytes.\n"),
+ device_name, retval);
+ printf(_("This may result in very poor performance, "
+ "(re)-partitioning suggested.\n"));
+ proceed_question();
+ }
+#endif
+
blocksize = EXT2_BLOCK_SIZE(&fs_param);
lazy_itable_init = get_bool_from_profile(fs_types,
--
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