[PATCH 3/3] xfsqa: Add fiemap exerciser
Dave Chinner
david at fromorbit.com
Wed Mar 3 00:19:22 CST 2010
From: Eric Sandeen <sandeen at redhat.com>
Preliminary fiemap testing support based on a test util written by
Josef Bacik.
For now it's only run with preallocation disabled, because xfs has a
tendency to fill in holes with data blocks (EOF prealloc stuff I
think) and similar for explicit preallocation, so this is breaking
the preallocation tests for now, when it finds a "data" block where
it expects a preallocated block.
Signed-off-by: Eric Sandeen <sandeen at redhat.com>
Reviewed-by: Dave Chinner <dchinner at redhat.com>
---
225 | 62 +++++
225.out | 2 +
aclocal.m4 | 19 ++
configure.in | 2 +
group | 1 +
include/builddefs.in | 2 +
src/Makefile | 8 +
src/fiemap-tester.c | 638 ++++++++++++++++++++++++++++++++++++++++++++++++++
8 files changed, 734 insertions(+), 0 deletions(-)
create mode 100644 225
create mode 100644 225.out
create mode 100644 src/fiemap-tester.c
diff --git a/225 b/225
new file mode 100644
index 0000000..673e93e
--- /dev/null
+++ b/225
@@ -0,0 +1,62 @@
+#! /bin/sh
+# FS QA Test No. 225
+#
+# Run the fiemap (file extent mapping) tester
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2009 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 at sandeen.net
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ cd /
+ rm -f $tmp.*
+ _cleanup_testdir
+}
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+
+_setup_testdir
+
+fiemapfile=$TEST_DIR/fiemap.$$
+
+[ -x $here/src/fiemap-tester ] || _notrun "fiemap-tester not built"
+
+echo "fiemap run without preallocation"
+$here/src/fiemap-tester -q -p 0 -r 200 /mnt/test/fiemapfile
+
+rm -f $fiemapfile
+rm -f $seq.full
+
+status=0
+exit
diff --git a/225.out b/225.out
new file mode 100644
index 0000000..7bc9312
--- /dev/null
+++ b/225.out
@@ -0,0 +1,2 @@
+QA output created by 225
+fiemap run without preallocation
diff --git a/aclocal.m4 b/aclocal.m4
index 02f56f2..6457d39 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -11,6 +11,25 @@
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.
+AC_DEFUN([AC_PACKAGE_WANT_LINUX_FIEMAP_H],
+ [ AC_CHECK_HEADERS([linux/fiemap.h], [ have_fiemap=true ], [ have_fiemap=false ])
+ AC_SUBST(have_fiemap)
+ ])
+
+AC_DEFUN([AC_PACKAGE_WANT_FALLOCATE],
+ [ AC_MSG_CHECKING([for fallocate])
+ AC_TRY_LINK([
+#define _GNU_SOURCE
+#define _FILE_OFFSET_BITS 64
+#include <fcntl.h>
+#include <linux/falloc.h>
+ ], [
+ fallocate(0, 0, 0, 0);
+ ], have_fallocate=yes
+ AC_MSG_RESULT(yes),
+ AC_MSG_RESULT(no))
+ AC_SUBST(have_fallocate)
+ ])
m4_include([m4/multilib.m4])
m4_include([m4/package_acldev.m4])
m4_include([m4/package_aiodev.m4])
diff --git a/configure.in b/configure.in
index 0d6f153..45b7fd1 100644
--- a/configure.in
+++ b/configure.in
@@ -64,6 +64,8 @@ in
AC_PACKAGE_WANT_GDBM
AC_PACKAGE_WANT_AIO
AC_PACKAGE_WANT_DMAPI
+ AC_PACKAGE_WANT_LINUX_FIEMAP_H
+ AC_PACKAGE_WANT_FALLOCATE
;;
esac
diff --git a/group b/group
index 5d675f0..8d4a83a 100644
--- a/group
+++ b/group
@@ -338,3 +338,4 @@ deprecated
222 auto fsr ioctl quick
223 auto quick
224 auto
+225 auto quick
diff --git a/include/builddefs.in b/include/builddefs.in
index 23a4991..3bea050 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -60,6 +60,8 @@ HAVE_DB = @have_db@
HAVE_AIO = @have_aio@
HAVE_DMAPI = @have_dmapi@
HAVE_ATTR_LIST = @have_attr_list@
+HAVE_FIEMAP = @have_fiemap@
+HAVE_FALLOCATE = @have_fallocate@
GCCFLAGS = -funsigned-char -fno-strict-aliasing -Wall
diff --git a/src/Makefile b/src/Makefile
index d86d50a..2f95fe2 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -25,6 +25,14 @@ ifeq ($(HAVE_XLOG_ASSIGN_LSN), true)
LINUX_TARGETS += loggen
endif
+ifeq ($(HAVE_FIEMAP), true)
+LINUX_TARGETS += fiemap-tester
+endif
+
+ifeq ($(HAVE_FALLOCATE),yes)
+LCFLAGS += -DHAVE_FALLOCATE
+endif
+
IRIX_TARGETS = open_unlink
ifeq ($(PKG_PLATFORM),linux)
diff --git a/src/fiemap-tester.c b/src/fiemap-tester.c
new file mode 100644
index 0000000..69016a9
--- /dev/null
+++ b/src/fiemap-tester.c
@@ -0,0 +1,638 @@
+/*
+ * Copyright (c) 2009 Josef Bacik
+ * 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 V2
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <ctype.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/fiemap.h>
+
+/* Global for non-critical message suppression */
+int quiet;
+
+static void
+usage(void)
+{
+ printf("Usage: fiemap-tester [-m map] [-r number of runs] [-s seed] [-q]");
+#ifdef HAVE_FALLOCATE
+ printf("[-p preallocate (1/0)] ");
+#endif
+ printf("filename\n");
+ printf(" -m map : generate a file with the map given and test\n");
+#ifdef HAVE_FALLOCATE
+ printf(" -p 0/1 : turn block preallocation on or off\n");
+#endif
+ printf(" -r count : number of runs to execute (default infinity)\n");
+ printf(" -s seed : seed for random map generator (default 1)\n");
+ printf(" -q : be quiet about non-errors\n");
+ printf("-m and -r cannot be used together\n");
+ exit(EXIT_FAILURE);
+}
+
+static char *
+generate_file_mapping(int blocks, int prealloc)
+{
+ char *map;
+ int num_types = 2, cur_block = 0;
+ int i = 0;
+
+ map = malloc(sizeof(char) * blocks);
+ if (!map)
+ return NULL;
+
+ if (prealloc)
+ num_types++;
+
+
+ for (i = 0; i < blocks; i++) {
+ long num = random() % num_types;
+ switch (num) {
+ case 0:
+ map[cur_block] = 'D';
+ break;
+ case 1:
+ map[cur_block] = 'H';
+ break;
+ case 2:
+ map[cur_block] = 'P';
+ break;
+ }
+ cur_block++;
+ }
+
+ return map;
+}
+
+static int
+create_file_from_mapping(int fd, char *map, int blocks, int blocksize)
+{
+ int cur_offset = 0, ret = 0, bufsize;
+ char *buf;
+ int i = 0;
+
+ bufsize = sizeof(char) * blocksize;
+ buf = malloc(bufsize);
+ if (!buf)
+ return -1;
+
+ memset(buf, 'a', bufsize);
+
+ for (i = 0; i < blocks; i++) {
+ switch (map[i]) {
+ case 'D':
+ ret = write(fd, buf, bufsize);
+ if (ret < bufsize) {
+ printf("Short write\n");
+ ret = -1;
+ goto out;
+ }
+ break;
+#ifdef HAVE_FALLOCATE
+ case 'P':
+ ret = fallocate(fd, 0, cur_offset, blocksize);
+ if (ret < 0) {
+ printf("Error fallocating\n");
+ goto out;
+ }
+ /* fallthrough; seek to end of prealloc space */
+#endif
+ case 'H':
+ ret = lseek(fd, blocksize, SEEK_CUR);
+ if (ret == (off_t)-1) {
+ printf("Error lseeking\n");
+ ret = -1;
+ goto out;
+ }
+ break;
+ default:
+ printf("Hrm, unrecognized flag in map\n");
+ ret = -1;
+ goto out;
+ }
+ cur_offset += blocksize;
+ }
+
+ ret = 0;
+out:
+ return ret;
+}
+
+static void
+show_extent_block(struct fiemap_extent *extent, int blocksize)
+{
+ __u64 logical = extent->fe_logical;
+ __u64 phys = extent->fe_physical;
+ __u64 length = extent->fe_length;
+ int flags = extent->fe_flags;
+
+ printf("logical: [%8llu..%8llu] phys: %8llu..%8llu "
+ "flags: 0x%03X tot: %llu\n",
+ logical / blocksize, (logical + length - 1) / blocksize,
+ phys / blocksize, (phys + length - 1) / blocksize,
+ flags,
+ (length / blocksize));
+}
+
+static void
+show_extents(struct fiemap *fiemap, int blocksize)
+{
+ unsigned int i;
+
+ for (i = 0; i < fiemap->fm_mapped_extents; i++)
+ show_extent_block(&fiemap->fm_extents[i], blocksize);
+}
+
+static int
+check_flags(struct fiemap *fiemap, int blocksize)
+{
+ struct fiemap_extent *extent;
+ __u64 aligned_offset, aligned_length;
+ int c;
+
+ for (c = 0; c < fiemap->fm_mapped_extents; c++) {
+ extent = &fiemap->fm_extents[c];
+
+ aligned_offset = extent->fe_physical & ~((__u64)blocksize - 1);
+ aligned_length = extent->fe_length & ~((__u64)blocksize - 1);
+
+ if ((aligned_offset != extent->fe_physical ||
+ aligned_length != extent->fe_length) &&
+ !(extent->fe_flags & FIEMAP_EXTENT_NOT_ALIGNED)) {
+ printf("ERROR: FIEMAP_EXTENT_NOT_ALIGNED is not set "
+ "but the extent is unaligned: %llu\n",
+ (unsigned long long)
+ (extent->fe_logical / blocksize));
+ return -1;
+ }
+
+ if (extent->fe_flags & FIEMAP_EXTENT_DATA_ENCRYPTED &&
+ !(extent->fe_flags & FIEMAP_EXTENT_ENCODED)) {
+ printf("ERROR: FIEMAP_EXTENT_DATA_ENCRYPTED is set, "
+ "but FIEMAP_EXTENT_ENCODED is not set: %llu\n",
+ (unsigned long long)
+ (extent->fe_logical / blocksize));
+ return -1;
+ }
+
+ if (extent->fe_flags & FIEMAP_EXTENT_NOT_ALIGNED &&
+ aligned_offset == extent->fe_physical &&
+ aligned_length == extent->fe_length) {
+ printf("ERROR: FIEMAP_EXTENT_NOT_ALIGNED is set but "
+ "offset and length is blocksize aligned: "
+ "%llu\n",
+ (unsigned long long)
+ (extent->fe_logical / blocksize));
+ return -1;
+ }
+
+ if (extent->fe_flags & FIEMAP_EXTENT_LAST &&
+ c + 1 < fiemap->fm_mapped_extents) {
+ printf("ERROR: FIEMAP_EXTENT_LAST is set but there are"
+ " more extents left: %llu\n",
+ (unsigned long long)
+ (extent->fe_logical / blocksize));
+ return -1;
+ }
+
+ if (extent->fe_flags & FIEMAP_EXTENT_DELALLOC &&
+ !(extent->fe_flags & FIEMAP_EXTENT_UNKNOWN)) {
+ printf("ERROR: FIEMAP_EXTENT_DELALLOC is set but "
+ "FIEMAP_EXTENT_UNKNOWN is not set: %llu\n",
+ (unsigned long long)
+ (extent->fe_logical / blocksize));
+ return -1;
+ }
+
+ if (extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE &&
+ !(extent->fe_flags & FIEMAP_EXTENT_NOT_ALIGNED)) {
+ printf("ERROR: FIEMAP_EXTENT_DATA_INLINE is set but "
+ "FIEMAP_EXTENT_NOT_ALIGNED is not set: %llu\n",
+ (unsigned long long)
+ (extent->fe_logical / blocksize));
+ return -1;
+ }
+
+ if (extent->fe_flags & FIEMAP_EXTENT_DATA_TAIL &&
+ !(extent->fe_flags & FIEMAP_EXTENT_NOT_ALIGNED)) {
+ printf("ERROR: FIEMAP_EXTENT_DATA_TAIL is set but "
+ "FIEMAP_EXTENT_NOT_ALIGNED is not set: %llu\n",
+ (unsigned long long)
+ (extent->fe_logical / blocksize));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int
+check_data(struct fiemap *fiemap, __u64 logical_offset, int blocksize,
+ int last, int prealloc)
+{
+ struct fiemap_extent *extent;
+ __u64 orig_offset = logical_offset;
+ int c, found = 0;
+
+ for (c = 0; c < fiemap->fm_mapped_extents; c++) {
+ __u64 start, end;
+ extent = &fiemap->fm_extents[c];
+
+ start = extent->fe_logical;
+ end = extent->fe_logical + extent->fe_length;
+
+ if (logical_offset > end)
+ continue;
+
+ if (logical_offset + blocksize < start)
+ break;
+
+ if (logical_offset >= start &&
+ logical_offset < end) {
+ if (prealloc &&
+ !(extent->fe_flags & FIEMAP_EXTENT_UNWRITTEN)) {
+ printf("ERROR: preallocated extent is not "
+ "marked with FIEMAP_EXTENT_UNWRITTEN: "
+ "%llu\n",
+ (unsigned long long)
+ (start / blocksize));
+ return -1;
+ }
+
+ if (logical_offset + blocksize > end) {
+ logical_offset = end+1;
+ continue;
+ } else {
+ found = 1;
+ break;
+ }
+ }
+ }
+
+ if (!found) {
+ printf("ERROR: couldn't find extent at %llu\n",
+ (unsigned long long)(orig_offset / blocksize));
+ } else if (last &&
+ !(fiemap->fm_extents[c].fe_flags & FIEMAP_EXTENT_LAST)) {
+ printf("ERROR: last extent not marked as last: %llu\n",
+ (unsigned long long)(orig_offset / blocksize));
+ found = 0;
+ }
+
+ return (!found) ? -1 : 0;
+}
+
+static int
+check_weird_fs_hole(int fd, __u64 logical_offset, int blocksize)
+{
+ static int warning_printed = 0;
+ int block, i;
+ size_t buf_len = sizeof(char) * blocksize;
+ char *buf;
+
+ block = (int)(logical_offset / blocksize);
+ if (ioctl(fd, FIBMAP, &block) < 0) {
+ perror("Can't fibmap file");
+ return -1;
+ }
+
+ if (!block) {
+ printf("ERROR: FIEMAP claimed there was data at a block "
+ "which should be a hole, and FIBMAP confirmend that "
+ "it is in fact a hole, so FIEMAP is wrong: %llu\n",
+ (unsigned long long)(logical_offset / blocksize));
+ return -1;
+ }
+
+ buf = malloc(buf_len);
+ if (!buf) {
+ perror("Could not allocate temporary buffer");
+ return -1;
+ }
+
+ if (pread(fd, buf, buf_len, (off_t)logical_offset) < 0) {
+ perror("Error reading from file");
+ free(buf);
+ return -1;
+ }
+
+ for (i = 0; i < buf_len; i++) {
+ if (buf[i] != 0) {
+ printf("ERROR: FIEMAP claimed there was data (%c) at "
+ "block %llu that should have been a hole, and "
+ "FIBMAP confirmed that it was allocated, but "
+ "it should be filled with 0's, but it was not "
+ "so you have a big problem!\n",
+ buf[i],
+ (unsigned long long)(logical_offset / blocksize));
+ free(buf);
+ return -1;
+ }
+ }
+
+ if (warning_printed || quiet) {
+ free(buf);
+ return 0;
+ }
+
+ printf("HEY FS PERSON: your fs is weird. I specifically wanted a\n"
+ "hole and you allocated a block anyway. FIBMAP confirms that\n"
+ "you allocated a block, and the block is filled with 0's so\n"
+ "everything is kosher, but you still allocated a block when\n"
+ "didn't need to. This may or may not be what you wanted,\n"
+ "which is why I'm only printing this message once, in case\n"
+ "you didn't do it on purpose. This was at block %llu.\n",
+ (unsigned long long)(logical_offset / blocksize));
+ warning_printed = 1;
+ free(buf);
+
+ return 0;
+}
+
+static int
+check_hole(struct fiemap *fiemap, int fd, __u64 logical_offset, int blocksize)
+{
+ struct fiemap_extent *extent;
+ int c;
+
+ for (c = 0; c < fiemap->fm_mapped_extents; c++) {
+ __u64 start, end;
+ extent = &fiemap->fm_extents[c];
+
+ start = extent->fe_logical;
+ end = extent->fe_logical + extent->fe_length;
+
+ if (logical_offset > end)
+ continue;
+ if (logical_offset + blocksize < start)
+ break;
+
+ if (logical_offset >= start &&
+ logical_offset < end) {
+
+ if (check_weird_fs_hole(fd, logical_offset,
+ blocksize) == 0)
+ break;
+
+ printf("ERROR: found an allocated extent where a hole "
+ "should be: %llu\n",
+ (unsigned long long)(start / blocksize));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int
+compare_fiemap_and_map(int fd, char *map, int blocks, int blocksize)
+{
+ struct fiemap *fiemap;
+ char *fiebuf;
+ int blocks_to_map, ret, cur_extent = 0, last_data;
+ __u64 map_start, map_length;
+ int i, c;
+
+ blocks_to_map = (random() % blocks) + 1;
+ fiebuf = malloc(sizeof(struct fiemap) +
+ (blocks_to_map * sizeof(struct fiemap_extent)));
+ if (!fiebuf) {
+ perror("Could not allocate fiemap buffers");
+ return -1;
+ }
+
+ fiemap = (struct fiemap *)fiebuf;
+ map_start = 0;
+ map_length = blocks_to_map * blocksize;
+
+ for (i = 0; i < blocks; i++) {
+ if (map[i] != 'H')
+ last_data = i;
+ }
+
+ fiemap->fm_flags = FIEMAP_FLAG_SYNC;
+ fiemap->fm_extent_count = blocks_to_map;
+ fiemap->fm_mapped_extents = 0;
+
+ do {
+ fiemap->fm_start = map_start;
+ fiemap->fm_length = map_length;
+
+ ret = ioctl(fd, FS_IOC_FIEMAP, (unsigned long)fiemap);
+ if (ret < 0) {
+ perror("FIEMAP ioctl failed");
+ free(fiemap);
+ return -1;
+ }
+
+ if (check_flags(fiemap, blocksize))
+ goto error;
+
+ for (i = cur_extent, c = 1; i < blocks; i++, c++) {
+ __u64 logical_offset = i * blocksize;
+
+ if (c > blocks_to_map)
+ break;
+
+ switch (map[i]) {
+ case 'D':
+ if (check_data(fiemap, logical_offset,
+ blocksize, last_data == i, 0))
+ goto error;
+ break;
+ case 'H':
+ if (check_hole(fiemap, fd, logical_offset,
+ blocksize))
+ goto error;
+ break;
+ case 'P':
+ if (check_data(fiemap, logical_offset,
+ blocksize, last_data == i, 1))
+ goto error;
+ break;
+ default:
+ printf("ERROR: weird value in map: %c\n",
+ map[i]);
+ goto error;
+ }
+ }
+ cur_extent = i;
+ map_start = i * blocksize;
+ } while (cur_extent < blocks);
+
+ ret = 0;
+ return ret;
+error:
+ printf("map is '%s'\n", map);
+ show_extents(fiemap, blocksize);
+ return -1;
+}
+
+int
+main(int argc, char **argv)
+{
+ int blocksize = 0; /* filesystem blocksize */
+ int fd; /* file descriptor */
+ int opt;
+ int rc;
+ char *fname; /* filename to map */
+ char *map = NULL; /* file map to generate */
+ int runs = -1; /* the number of runs to have */
+ int blocks = 0; /* the number of blocks to generate */
+ int maxblocks = 0; /* max # of blocks to create */
+ int prealloc = 1; /* whether or not to do preallocation */
+ int seed = 1;
+
+ while ((opt = getopt(argc, argv, "m:r:s:p:q")) != -1) {
+ switch(opt) {
+ case 'm':
+ map = strdup(optarg);
+ break;
+ case 'p':
+ prealloc = atoi(optarg);;
+#ifndef HAVE_FALLOCATE
+ if (prealloc)
+ printf("Not built with preallocation support\n");
+ usage();
+#endif
+ break;
+ case 'q':
+ quiet = 1;
+ break;
+ /* sync file before mapping */
+ case 'r':
+ runs = atoi(optarg);
+ break;
+ case 's':
+ seed = atoi(optarg);
+ break;
+ default:
+ usage();
+ }
+ }
+
+ if (runs != -1 && map)
+ usage();
+
+ fname = argv[optind++];
+ if (!fname)
+ usage();
+
+ fd = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0644);
+ if (fd < 0) {
+ perror("Can't open file");
+ exit(1);
+ }
+
+ if (ioctl(fd, FIGETBSZ, &blocksize) < 0) {
+ perror("Can't get filesystem block size");
+ close(fd);
+ exit(1);
+ }
+
+#ifdef HAVE_FALLOCATE
+ /* if fallocate passes, then we can do preallocation, else not */
+ if (prealloc) {
+ prealloc = !((int)fallocate(fd, 0, 0, blocksize));
+ if (!prealloc)
+ printf("preallocation not supported, disabling\n");
+ }
+#else
+ prealloc = 0;
+#endif
+
+ if (ftruncate(fd, 0)) {
+ perror("Can't truncate file");
+ close(fd);
+ exit(1);
+ }
+
+ if (map) {
+ blocks = strlen(map);
+ runs = 0;
+ }
+
+ srandom(seed);
+
+ /* max file size 2mb / block size */
+ maxblocks = (2 * 1024 * 1024) / blocksize;
+
+ if (runs == -1)
+ printf("Starting infinite run, if you don't see any output "
+ "then its working properly.\n");
+ do {
+ if (!map) {
+ blocks = random() % maxblocks;
+ if (blocks == 0) {
+ if (!quiet)
+ printf("Skipping 0 length file\n");
+ continue;
+ }
+
+ map = generate_file_mapping(blocks, prealloc);
+ if (!map) {
+ printf("Could not create map\n");
+ exit(1);
+ }
+ }
+
+ rc = create_file_from_mapping(fd, map, blocks, blocksize);
+ if (rc) {
+ perror("Could not create file\n");
+ free(map);
+ close(fd);
+ exit(1);
+ }
+
+ rc = compare_fiemap_and_map(fd, map, blocks, blocksize);
+ if (rc) {
+ printf("Problem comparing fiemap and map\n");
+ free(map);
+ close(fd);
+ exit(1);
+ }
+
+ free(map);
+ map = NULL;
+
+ if (ftruncate(fd, 0)) {
+ perror("Could not truncate file\n");
+ close(fd);
+ exit(1);
+ }
+
+ if (lseek(fd, 0, SEEK_SET)) {
+ perror("Could not seek set\n");
+ close(fd);
+ exit(1);
+ }
+
+ if (runs) runs--;
+ } while (runs != 0);
+
+ close(fd);
+
+ return 0;
+}
--
1.6.5
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