xfstests: 223 - test file alignment on stripe geometry

A first-cut test to ensure that files are well-aligned on filesystems
with stripe geometry.

Several sizes of stripe units are mkfs'd, and then files are written
and fallocated in various multiples of those stripe sizes.
Each file is checked to ensure that the first block is
stripe-aligned.

(Ideally, for any fragmented files, we should ensure that each
fragment start is well-aligned, but this does not do that yet)

(slightly unrelated: don't send scratch mkfs output to /dev/null,
we'd like to see mkfs output and direct it to $seq.full - this
more or less matches _scratch_mkfs_xfs behavior and doesn't
break any tests that I can see)

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/223 b/223
new file mode 100755 (executable)
index 0000000..5c95f7d
--- /dev/null
+++ b/223
@@ -0,0 +1,103 @@
+#! /bin/bash
+# FS QA Test No. 223
+#
+# File alignment tests
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2010 Eric Sandeen.  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
+#
+#-----------------------------------------------------------------------
+#
+# creator
+owner=sandeen@sandeen.net
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1       # failure is the default!
+
+_cleanup()
+{
+    rm -f $tmp.*
+}
+
+trap "_cleanup ; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+
+_require_scratch
+_require_xfs_io_falloc
+
+rm -f $seq.full
+
+_filter_scratch()
+{
+       sed -e "s,$SCRATCH_MNT,SCRATCH_MNT,g"
+}
+
+BLOCKSIZE=4096
+
+for SUNIT_K in 8 16 32 64 128; do
+       let SUNIT_BYTES=$SUNIT_K*1024
+       let SUNIT_BLOCKS=$SUNIT_BYTES/$BLOCKSIZE
+
+       echo "=== mkfs with su $SUNIT_BLOCKS blocks x 4 ==="
+       _scratch_mkfs_geom $SUNIT_BYTES 4 $BLOCKSIZE &>> $seq.full
+       _scratch_mount
+
+       for SIZE_MULT in 1 2 8 64 256; do
+               let SIZE=$SIZE_MULT*$SUNIT_BYTES
+
+               echo "=== Testing size ${SIZE_MULT}*${SUNIT_K}k on ${SUNIT_K}k stripe ==="
+               for FILE in 1 2 3 4; do
+                       xfs_io -F -f -c "falloc 0 $SIZE" \
+                               $SCRATCH_MNT/file-$FILE-$SIZE-falloc \
+                                       &>> $seq.full
+                       xfs_io -F -f -c "pwrite 0 $SIZE" \
+                               $SCRATCH_MNT/file-$FILE-$SIZE-write \
+                                       &>> $seq.full
+                       src/t_stripealign $SCRATCH_MNT/file-$FILE-$SIZE-falloc \
+                               $SUNIT_BLOCKS | _filter_scratch
+                       src/t_stripealign $SCRATCH_MNT/file-$FILE-$SIZE-write \
+                               $SUNIT_BLOCKS | _filter_scratch
+               done
+       done
+
+       echo "=== Testing size 1g falloc on ${SUNIT_K}k stripe ==="
+       xfs_io -F -f -c "falloc 0 1g" $SCRATCH_MNT/file-1g-falloc &>> $seq.full
+       src/t_stripealign $SCRATCH_MNT/file-1g-falloc $SUNIT_BLOCKS
+
+       rm -f $SCRATCH_MNT/file-1g-falloc | _filter_scratch
+
+       echo "=== Testing size 1073745920 falloc on ${SUNIT_K}k stripe ==="
+       xfs_io -F -f -c "falloc 0 1073745920" \
+               $SCRATCH_MNT/file-1073745920-falloc &>> $seq.full
+       src/t_stripealign $SCRATCH_MNT/file-1073745920-falloc \
+               $SUNIT_BLOCKS | _filter_scratch
+
+       _scratch_unmount
+done
+
+status=0
+exit

diff --git a/223.out b/223.out
new file mode 100644 (file)
index 0000000..c9588ef
--- /dev/null
+++ b/223.out
@@ -0,0 +1,251 @@
+QA output created by 223
+=== mkfs with su 2 blocks x 4 ===
+=== Testing size 1*8k on 8k stripe ===
+SCRATCH_MNT/file-1-8192-falloc: well-aligned
+SCRATCH_MNT/file-1-8192-write: well-aligned
+SCRATCH_MNT/file-2-8192-falloc: well-aligned
+SCRATCH_MNT/file-2-8192-write: well-aligned
+SCRATCH_MNT/file-3-8192-falloc: well-aligned
+SCRATCH_MNT/file-3-8192-write: well-aligned
+SCRATCH_MNT/file-4-8192-falloc: well-aligned
+SCRATCH_MNT/file-4-8192-write: well-aligned
+=== Testing size 2*8k on 8k stripe ===
+SCRATCH_MNT/file-1-16384-falloc: well-aligned
+SCRATCH_MNT/file-1-16384-write: well-aligned
+SCRATCH_MNT/file-2-16384-falloc: well-aligned
+SCRATCH_MNT/file-2-16384-write: well-aligned
+SCRATCH_MNT/file-3-16384-falloc: well-aligned
+SCRATCH_MNT/file-3-16384-write: well-aligned
+SCRATCH_MNT/file-4-16384-falloc: well-aligned
+SCRATCH_MNT/file-4-16384-write: well-aligned
+=== Testing size 8*8k on 8k stripe ===
+SCRATCH_MNT/file-1-65536-falloc: well-aligned
+SCRATCH_MNT/file-1-65536-write: well-aligned
+SCRATCH_MNT/file-2-65536-falloc: well-aligned
+SCRATCH_MNT/file-2-65536-write: well-aligned
+SCRATCH_MNT/file-3-65536-falloc: well-aligned
+SCRATCH_MNT/file-3-65536-write: well-aligned
+SCRATCH_MNT/file-4-65536-falloc: well-aligned
+SCRATCH_MNT/file-4-65536-write: well-aligned
+=== Testing size 64*8k on 8k stripe ===
+SCRATCH_MNT/file-1-524288-falloc: well-aligned
+SCRATCH_MNT/file-1-524288-write: well-aligned
+SCRATCH_MNT/file-2-524288-falloc: well-aligned
+SCRATCH_MNT/file-2-524288-write: well-aligned
+SCRATCH_MNT/file-3-524288-falloc: well-aligned
+SCRATCH_MNT/file-3-524288-write: well-aligned
+SCRATCH_MNT/file-4-524288-falloc: well-aligned
+SCRATCH_MNT/file-4-524288-write: well-aligned
+=== Testing size 256*8k on 8k stripe ===
+SCRATCH_MNT/file-1-2097152-falloc: well-aligned
+SCRATCH_MNT/file-1-2097152-write: well-aligned
+SCRATCH_MNT/file-2-2097152-falloc: well-aligned
+SCRATCH_MNT/file-2-2097152-write: well-aligned
+SCRATCH_MNT/file-3-2097152-falloc: well-aligned
+SCRATCH_MNT/file-3-2097152-write: well-aligned
+SCRATCH_MNT/file-4-2097152-falloc: well-aligned
+SCRATCH_MNT/file-4-2097152-write: well-aligned
+=== Testing size 1g falloc on 8k stripe ===
+/mnt/scratch/file-1g-falloc: well-aligned
+=== Testing size 1073745920 falloc on 8k stripe ===
+SCRATCH_MNT/file-1073745920-falloc: well-aligned
+=== mkfs with su 4 blocks x 4 ===
+=== Testing size 1*16k on 16k stripe ===
+SCRATCH_MNT/file-1-16384-falloc: well-aligned
+SCRATCH_MNT/file-1-16384-write: well-aligned
+SCRATCH_MNT/file-2-16384-falloc: well-aligned
+SCRATCH_MNT/file-2-16384-write: well-aligned
+SCRATCH_MNT/file-3-16384-falloc: well-aligned
+SCRATCH_MNT/file-3-16384-write: well-aligned
+SCRATCH_MNT/file-4-16384-falloc: well-aligned
+SCRATCH_MNT/file-4-16384-write: well-aligned
+=== Testing size 2*16k on 16k stripe ===
+SCRATCH_MNT/file-1-32768-falloc: well-aligned
+SCRATCH_MNT/file-1-32768-write: well-aligned
+SCRATCH_MNT/file-2-32768-falloc: well-aligned
+SCRATCH_MNT/file-2-32768-write: well-aligned
+SCRATCH_MNT/file-3-32768-falloc: well-aligned
+SCRATCH_MNT/file-3-32768-write: well-aligned
+SCRATCH_MNT/file-4-32768-falloc: well-aligned
+SCRATCH_MNT/file-4-32768-write: well-aligned
+=== Testing size 8*16k on 16k stripe ===
+SCRATCH_MNT/file-1-131072-falloc: well-aligned
+SCRATCH_MNT/file-1-131072-write: well-aligned
+SCRATCH_MNT/file-2-131072-falloc: well-aligned
+SCRATCH_MNT/file-2-131072-write: well-aligned
+SCRATCH_MNT/file-3-131072-falloc: well-aligned
+SCRATCH_MNT/file-3-131072-write: well-aligned
+SCRATCH_MNT/file-4-131072-falloc: well-aligned
+SCRATCH_MNT/file-4-131072-write: well-aligned
+=== Testing size 64*16k on 16k stripe ===
+SCRATCH_MNT/file-1-1048576-falloc: well-aligned
+SCRATCH_MNT/file-1-1048576-write: well-aligned
+SCRATCH_MNT/file-2-1048576-falloc: well-aligned
+SCRATCH_MNT/file-2-1048576-write: well-aligned
+SCRATCH_MNT/file-3-1048576-falloc: well-aligned
+SCRATCH_MNT/file-3-1048576-write: well-aligned
+SCRATCH_MNT/file-4-1048576-falloc: well-aligned
+SCRATCH_MNT/file-4-1048576-write: well-aligned
+=== Testing size 256*16k on 16k stripe ===
+SCRATCH_MNT/file-1-4194304-falloc: well-aligned
+SCRATCH_MNT/file-1-4194304-write: well-aligned
+SCRATCH_MNT/file-2-4194304-falloc: well-aligned
+SCRATCH_MNT/file-2-4194304-write: well-aligned
+SCRATCH_MNT/file-3-4194304-falloc: well-aligned
+SCRATCH_MNT/file-3-4194304-write: well-aligned
+SCRATCH_MNT/file-4-4194304-falloc: well-aligned
+SCRATCH_MNT/file-4-4194304-write: well-aligned
+=== Testing size 1g falloc on 16k stripe ===
+/mnt/scratch/file-1g-falloc: well-aligned
+=== Testing size 1073745920 falloc on 16k stripe ===
+SCRATCH_MNT/file-1073745920-falloc: well-aligned
+=== mkfs with su 8 blocks x 4 ===
+=== Testing size 1*32k on 32k stripe ===
+SCRATCH_MNT/file-1-32768-falloc: well-aligned
+SCRATCH_MNT/file-1-32768-write: well-aligned
+SCRATCH_MNT/file-2-32768-falloc: well-aligned
+SCRATCH_MNT/file-2-32768-write: well-aligned
+SCRATCH_MNT/file-3-32768-falloc: well-aligned
+SCRATCH_MNT/file-3-32768-write: well-aligned
+SCRATCH_MNT/file-4-32768-falloc: well-aligned
+SCRATCH_MNT/file-4-32768-write: well-aligned
+=== Testing size 2*32k on 32k stripe ===
+SCRATCH_MNT/file-1-65536-falloc: well-aligned
+SCRATCH_MNT/file-1-65536-write: well-aligned
+SCRATCH_MNT/file-2-65536-falloc: well-aligned
+SCRATCH_MNT/file-2-65536-write: well-aligned
+SCRATCH_MNT/file-3-65536-falloc: well-aligned
+SCRATCH_MNT/file-3-65536-write: well-aligned
+SCRATCH_MNT/file-4-65536-falloc: well-aligned
+SCRATCH_MNT/file-4-65536-write: well-aligned
+=== Testing size 8*32k on 32k stripe ===
+SCRATCH_MNT/file-1-262144-falloc: well-aligned
+SCRATCH_MNT/file-1-262144-write: well-aligned
+SCRATCH_MNT/file-2-262144-falloc: well-aligned
+SCRATCH_MNT/file-2-262144-write: well-aligned
+SCRATCH_MNT/file-3-262144-falloc: well-aligned
+SCRATCH_MNT/file-3-262144-write: well-aligned
+SCRATCH_MNT/file-4-262144-falloc: well-aligned
+SCRATCH_MNT/file-4-262144-write: well-aligned
+=== Testing size 64*32k on 32k stripe ===
+SCRATCH_MNT/file-1-2097152-falloc: well-aligned
+SCRATCH_MNT/file-1-2097152-write: well-aligned
+SCRATCH_MNT/file-2-2097152-falloc: well-aligned
+SCRATCH_MNT/file-2-2097152-write: well-aligned
+SCRATCH_MNT/file-3-2097152-falloc: well-aligned
+SCRATCH_MNT/file-3-2097152-write: well-aligned
+SCRATCH_MNT/file-4-2097152-falloc: well-aligned
+SCRATCH_MNT/file-4-2097152-write: well-aligned
+=== Testing size 256*32k on 32k stripe ===
+SCRATCH_MNT/file-1-8388608-falloc: well-aligned
+SCRATCH_MNT/file-1-8388608-write: well-aligned
+SCRATCH_MNT/file-2-8388608-falloc: well-aligned
+SCRATCH_MNT/file-2-8388608-write: well-aligned
+SCRATCH_MNT/file-3-8388608-falloc: well-aligned
+SCRATCH_MNT/file-3-8388608-write: well-aligned
+SCRATCH_MNT/file-4-8388608-falloc: well-aligned
+SCRATCH_MNT/file-4-8388608-write: well-aligned
+=== Testing size 1g falloc on 32k stripe ===
+/mnt/scratch/file-1g-falloc: well-aligned
+=== Testing size 1073745920 falloc on 32k stripe ===
+SCRATCH_MNT/file-1073745920-falloc: well-aligned
+=== mkfs with su 16 blocks x 4 ===
+=== Testing size 1*64k on 64k stripe ===
+SCRATCH_MNT/file-1-65536-falloc: well-aligned
+SCRATCH_MNT/file-1-65536-write: well-aligned
+SCRATCH_MNT/file-2-65536-falloc: well-aligned
+SCRATCH_MNT/file-2-65536-write: well-aligned
+SCRATCH_MNT/file-3-65536-falloc: well-aligned
+SCRATCH_MNT/file-3-65536-write: well-aligned
+SCRATCH_MNT/file-4-65536-falloc: well-aligned
+SCRATCH_MNT/file-4-65536-write: well-aligned
+=== Testing size 2*64k on 64k stripe ===
+SCRATCH_MNT/file-1-131072-falloc: well-aligned
+SCRATCH_MNT/file-1-131072-write: well-aligned
+SCRATCH_MNT/file-2-131072-falloc: well-aligned
+SCRATCH_MNT/file-2-131072-write: well-aligned
+SCRATCH_MNT/file-3-131072-falloc: well-aligned
+SCRATCH_MNT/file-3-131072-write: well-aligned
+SCRATCH_MNT/file-4-131072-falloc: well-aligned
+SCRATCH_MNT/file-4-131072-write: well-aligned
+=== Testing size 8*64k on 64k stripe ===
+SCRATCH_MNT/file-1-524288-falloc: well-aligned
+SCRATCH_MNT/file-1-524288-write: well-aligned
+SCRATCH_MNT/file-2-524288-falloc: well-aligned
+SCRATCH_MNT/file-2-524288-write: well-aligned
+SCRATCH_MNT/file-3-524288-falloc: well-aligned
+SCRATCH_MNT/file-3-524288-write: well-aligned
+SCRATCH_MNT/file-4-524288-falloc: well-aligned
+SCRATCH_MNT/file-4-524288-write: well-aligned
+=== Testing size 64*64k on 64k stripe ===
+SCRATCH_MNT/file-1-4194304-falloc: well-aligned
+SCRATCH_MNT/file-1-4194304-write: well-aligned
+SCRATCH_MNT/file-2-4194304-falloc: well-aligned
+SCRATCH_MNT/file-2-4194304-write: well-aligned
+SCRATCH_MNT/file-3-4194304-falloc: well-aligned
+SCRATCH_MNT/file-3-4194304-write: well-aligned
+SCRATCH_MNT/file-4-4194304-falloc: well-aligned
+SCRATCH_MNT/file-4-4194304-write: well-aligned
+=== Testing size 256*64k on 64k stripe ===
+SCRATCH_MNT/file-1-16777216-falloc: well-aligned
+SCRATCH_MNT/file-1-16777216-write: well-aligned
+SCRATCH_MNT/file-2-16777216-falloc: well-aligned
+SCRATCH_MNT/file-2-16777216-write: well-aligned
+SCRATCH_MNT/file-3-16777216-falloc: well-aligned
+SCRATCH_MNT/file-3-16777216-write: well-aligned
+SCRATCH_MNT/file-4-16777216-falloc: well-aligned
+SCRATCH_MNT/file-4-16777216-write: well-aligned
+=== Testing size 1g falloc on 64k stripe ===
+/mnt/scratch/file-1g-falloc: well-aligned
+=== Testing size 1073745920 falloc on 64k stripe ===
+SCRATCH_MNT/file-1073745920-falloc: well-aligned
+=== mkfs with su 32 blocks x 4 ===
+=== Testing size 1*128k on 128k stripe ===
+SCRATCH_MNT/file-1-131072-falloc: well-aligned
+SCRATCH_MNT/file-1-131072-write: well-aligned
+SCRATCH_MNT/file-2-131072-falloc: well-aligned
+SCRATCH_MNT/file-2-131072-write: well-aligned
+SCRATCH_MNT/file-3-131072-falloc: well-aligned
+SCRATCH_MNT/file-3-131072-write: well-aligned
+SCRATCH_MNT/file-4-131072-falloc: well-aligned
+SCRATCH_MNT/file-4-131072-write: well-aligned
+=== Testing size 2*128k on 128k stripe ===
+SCRATCH_MNT/file-1-262144-falloc: well-aligned
+SCRATCH_MNT/file-1-262144-write: well-aligned
+SCRATCH_MNT/file-2-262144-falloc: well-aligned
+SCRATCH_MNT/file-2-262144-write: well-aligned
+SCRATCH_MNT/file-3-262144-falloc: well-aligned
+SCRATCH_MNT/file-3-262144-write: well-aligned
+SCRATCH_MNT/file-4-262144-falloc: well-aligned
+SCRATCH_MNT/file-4-262144-write: well-aligned
+=== Testing size 8*128k on 128k stripe ===
+SCRATCH_MNT/file-1-1048576-falloc: well-aligned
+SCRATCH_MNT/file-1-1048576-write: well-aligned
+SCRATCH_MNT/file-2-1048576-falloc: well-aligned
+SCRATCH_MNT/file-2-1048576-write: well-aligned
+SCRATCH_MNT/file-3-1048576-falloc: well-aligned
+SCRATCH_MNT/file-3-1048576-write: well-aligned
+SCRATCH_MNT/file-4-1048576-falloc: well-aligned
+SCRATCH_MNT/file-4-1048576-write: well-aligned
+=== Testing size 64*128k on 128k stripe ===
+SCRATCH_MNT/file-1-8388608-falloc: well-aligned
+SCRATCH_MNT/file-1-8388608-write: well-aligned
+SCRATCH_MNT/file-2-8388608-falloc: well-aligned
+SCRATCH_MNT/file-2-8388608-write: well-aligned
+SCRATCH_MNT/file-3-8388608-falloc: well-aligned
+SCRATCH_MNT/file-3-8388608-write: well-aligned
+SCRATCH_MNT/file-4-8388608-falloc: well-aligned
+SCRATCH_MNT/file-4-8388608-write: well-aligned
+=== Testing size 256*128k on 128k stripe ===
+SCRATCH_MNT/file-1-33554432-falloc: well-aligned
+SCRATCH_MNT/file-1-33554432-write: well-aligned
+SCRATCH_MNT/file-2-33554432-falloc: well-aligned
+SCRATCH_MNT/file-2-33554432-write: well-aligned
+SCRATCH_MNT/file-3-33554432-falloc: well-aligned
+SCRATCH_MNT/file-3-33554432-write: well-aligned
+SCRATCH_MNT/file-4-33554432-falloc: well-aligned
+SCRATCH_MNT/file-4-33554432-write: well-aligned
+=== Testing size 1g falloc on 128k stripe ===
+/mnt/scratch/file-1g-falloc: well-aligned
+=== Testing size 1073745920 falloc on 128k stripe ===
+SCRATCH_MNT/file-1073745920-falloc: well-aligned

diff --git a/common.rc b/common.rc
index 67128381ec6ed1751fe55a5925eff0f17f6148db..1edea2f65c6930fbc14e9288cc1e77d493932ffb 100644 (file)
--- a/common.rc
+++ b/common.rc
@@ -300,11 +300,37 @@ _scratch_mkfs()
         $MKFS_UDF_PROG $MKFS_OPTIONS $* $SCRATCH_DEV > /dev/null
        ;;
     *)
-       /sbin/mkfs -t $FSTYP -- $MKFS_OPTIONS $* $SCRATCH_DEV > /dev/null
+       /sbin/mkfs -t $FSTYP -- $MKFS_OPTIONS $* $SCRATCH_DEV
        ;;
     esac
 }
 
+# Emulate an N-data-disk stripe w/ various stripe units
+# _scratch_mkfs_geom <sunit bytes> <swidth multiplier> [optional blocksize]
+_scratch_mkfs_geom()
+{
+    sunit_bytes=$1
+    swidth_mult=$2
+    blocksize=$3
+    [ -z "$blocksize" ] && blocksize=4096
+
+    let sunit_blocks=$sunit_bytes/$blocksize
+    let swidth_blocks=$sunit_blocks*$swidth_mult
+
+    case $FSTYP in
+    xfs)
+       MKFS_OPTIONS="-b size=$blocksize, -d su=$sunit_bytes,sw=$swidth_mult"
+       ;;
+    ext4)
+       MKFS_OPTIONS="-b $blocksize -E stride=$sunit_blocks,stripe_width=$swidth_blocks"
+       ;;
+    *)
+       _notrun "can't mkfs $FSTYP with geometry"
+       ;;
+    esac
+    _scratch_mkfs
+}
+
 _scratch_xfs_db_options()
 {
     SCRATCH_OPTIONS=""

diff --git a/group b/group
index 342ac89b248d73d7a598a88faef586fafca1cfb1..6b8528f48df8607a3cf0fc1f99d5d9120a219d6f 100644 (file)
--- a/group
+++ b/group
@@ -336,3 +336,4 @@ deprecated
 220 auto quota quick
 221 auto metadata quick
 222 auto fsr ioctl quick
+223 auto quick

diff --git a/src/Makefile b/src/Makefile
index baa2e94b03da76d6dfd283cc702d631b338ed18f..d86d50a2b2984bbc8510c90203b614db7e2e6f9b 100644 (file)
--- a/src/Makefile
+++ b/src/Makefile
@@ -14,7 +14,7 @@ TARGETS = dirstress fill fill2 getpagesize holes lstat64 \
 
 LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \
        preallo_rw_pattern_writer ftrunc trunc fs_perms testx looptest \
-       locktest unwritten_mmap bulkstat_unlink_test \
+       locktest unwritten_mmap bulkstat_unlink_test t_stripealign \
        bulkstat_unlink_test_modified t_dir_offset t_futimens t_immutable
 
 SUBDIRS =

diff --git a/src/t_stripealign.c b/src/t_stripealign.c
new file mode 100644 (file)
index 0000000..05ed36b
--- /dev/null
+++ b/src/t_stripealign.c
@@ -0,0 +1,68 @@
+/*
+ * t_stripealign.c
+ *
+ * Print whether the file start block is stripe-aligned.
+ *
+ * Copyright (c) 2010 Eric Sandeen <sandeen@sandeen.net>
+ *
+ * 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; either version 2, or (at your option)
+ * any later version.
+ */
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+
+#define FIBMAP          _IO(0x00, 1)    /* bmap access */
+
+/*
+ * If only filename given, print first block.
+ *
+ * If filename & sunit (in blocks) given, print whether we are well-aligned
+ */
+
+int main(int argc, char ** argv)
+{
+       int     fd;
+       int     ret;
+       int     sunit = 0;      /* in blocks */
+       char    *filename;
+       unsigned int    block = 0;
+
+        if (argc < 3) {
+                printf("Usage: %s <filename> <sunit in blocks>\n", argv[0]);
+                return 1;
+        }
+
+        filename = argv[1];
+       sunit = atoi(argv[2]);
+
+        fd = open(filename, O_RDONLY);
+        if (fd < 0) {
+                perror("can't open file\n");
+                return 1;
+        }
+
+       ret = ioctl(fd, FIBMAP, &block);
+       if (ret < 0) {
+               close(fd);
+               perror("fibmap");
+               return 1;
+       }
+
+       close(fd);
+
+       if (block % sunit) {
+               printf("%s: Start block %u not multiple of sunit %u\n",
+                       filename, block, sunit);
+               return 1;
+       } else
+               printf("%s: well-aligned\n", filename);
+
+       return 0;
+}