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[PATCH] xfstests: add SEEK_DATA/SEEK_HOLE sanity checker

To: xfs@xxxxxxxxxxx
Subject: [PATCH] xfstests: add SEEK_DATA/SEEK_HOLE sanity checker
From: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Wed, 28 Dec 2011 21:41:33 +0800
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Chris Mason <chris.mason@xxxxxxxxxx>
Organization: Oracle
Reply-to: jeff.liu@xxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.18) Gecko/20110617 Thunderbird/3.1.11
Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>

---
 276                      |   63 +++++
 group                    |    1 +
 src/Makefile             |    2 +-
 src/seek_sanity_tester.c |  683
++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 748 insertions(+), 1 deletions(-)
 create mode 100755 276
 create mode 100644 src/seek_sanity_tester.c

diff --git a/276 b/276
new file mode 100755
index 0000000..13843fe
--- /dev/null
+++ b/276
@@ -0,0 +1,63 @@
+#! /bin/bash
+# FS QA Test No. 276
+#
+# SEEK_DATA/SEEK_HOLE sanity checker.
+#
+# Improved by Jeff.liu@xxxxxxxxxx
+# Creater: josef@xxxxxxxxxx
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2011 Oracle Inc.  All Rights Reserved.
+# Copyright (c) 2011 Red Hat.  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=josef@xxxxxxxxxx
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+status=0       # success is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# real QA test starts here
+
+# Modify as appropriate.
+# FIXME: _supported_os should include Solaris too.
+_supported_fs generic
+_supported_os Linux Solaris
+
+base_test_path=$TEST_DIR/seek_sanity_testfile
+
+[ -x $here/src/seek_sanity_tester ] || _notrun "seek_sanitfy_tester not
built"
+
+_cleanup()
+{
+       rm -f $base_test_path.*
+}
+
+rm -rf $seq.out
+echo "QA output created by $seq" > $seq.out
+$here/src/seek_sanity_tester $base_test_path 2>&1 | tee -a $seq.out
+
+# success, all done
+status=0
+exit
diff --git a/group b/group
index 08d999a..be4bd9b 100644
--- a/group
+++ b/group
@@ -389,3 +389,4 @@ deprecated
 273 auto rw
 274 auto rw
 275 auto rw
+276 auto quick
diff --git a/src/Makefile b/src/Makefile
index 67250ee..6797064 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -17,7 +17,7 @@ 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 t_stripealign \
        bulkstat_unlink_test_modified t_dir_offset t_futimens t_immutable \
-       stale_handle pwrite_mmap_blocked fstrim t_dir_offset2
+       stale_handle pwrite_mmap_blocked fstrim t_dir_offset2 seek_sanity_tester

 SUBDIRS =

diff --git a/src/seek_sanity_tester.c b/src/seek_sanity_tester.c
new file mode 100644
index 0000000..2ef3839
--- /dev/null
+++ b/src/seek_sanity_tester.c
@@ -0,0 +1,683 @@
+/*
+ * Copyright (C) 2011 Oracle.  All rights reserved.
+ * Copyright (C) 2011 Red Hat.  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 will 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 to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#define _XOPEN_SOURCE 500
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#ifndef SEEK_DATA
+#define SEEK_DATA      3
+#define SEEK_HOLE      4
+#endif
+
+static blksize_t alloc_size;
+int default_behavior = 0;
+char *base_file_path;
+
+static void get_file_system(int fd)
+{
+       struct statfs buf;
+
+       if (!fstatfs(fd, &buf))
+               fprintf(stdout, "File system magic#: 0x%x\n", buf.f_type);
+}
+
+static int get_io_sizes(int fd)
+{
+       struct stat buf;
+       int ret;
+
+       ret = fstat(fd, &buf);
+       if (ret)
+               fprintf(stderr, "  ERROR %d: Failed to find io blocksize\n",
+                       errno);
+
+       /* st_blksize is typically also the allocation size */
+       alloc_size = buf.st_blksize;
+       fprintf(stdout, "Allocation size: %ld\n", alloc_size);
+
+       return ret;
+}
+
+#define do_free(x)     do { if(x) free(x); } while(0);
+
+static void *do_malloc(size_t size)
+{
+       void *buf;
+
+       buf = malloc(size);
+       if (!buf)
+               fprintf(stderr, "  ERROR: Unable to allocate %ld bytes\n",
+                       (long)size);
+
+       return buf;
+}
+
+static int do_truncate(int fd, off_t length)
+{
+       int ret;
+
+       ret = ftruncate(fd, length);
+       if (ret)
+               fprintf(stderr, "  ERROR %d: Failed to extend file "
+                       "to %ld bytes\n", errno, (long)length);
+       return ret;
+}
+
+static int do_fallocate(int fd, off_t offset, off_t length, int mode)
+{
+       int ret;
+
+       ret = fallocate(fd, mode, offset, length);
+       if (ret)
+               fprintf(stderr, "  ERROR %d: Failed to preallocate "
+                       "space to %ld bytes\n", errno, (long) length);
+
+       return ret;
+}
+
+/*
+ * Synchnorize all dirty pages in the file range starting from
+ * offset to nbytes length.
+ */
+static int do_sync_dirty_pages(int fd, off64_t offset, off64_t nbytes)
+{
+       int ret;
+
+       ret = sync_file_range(fd, offset, nbytes, SYNC_FILE_RANGE_WRITE);
+       if (ret)
+               fprintf(stderr, "  ERROR %d: Failed to sync out dirty "
+                       "pages\n", errno);
+
+       return ret;
+}
+
+static ssize_t do_pwrite(int fd, const void *buf, size_t count, off_t
offset)
+{
+       ssize_t ret, written = 0;
+
+       while (count > written) {
+               ret = pwrite(fd, buf + written, count - written, offset
+ written);
+               if (ret < 0) {
+                       fprintf(stderr, "  ERROR %d: Failed to write %ld "
+                               "bytes\n", errno, (long)count);
+                       return ret;
+               }
+               written += ret;
+       }
+
+       return 0;
+}
+
+#define do_close(x)    do { if ((x) > -1) close(x); } while(0);
+
+static int do_create(const char *filename)
+{
+       int fd;
+
+       fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0644);
+       if (fd < 0)
+               fprintf(stderr, " ERROR %d: Failed to create file '%s'\n",
+                       errno, filename);
+
+       return fd;
+}
+
+static int do_lseek(int testnum, int subtest, int fd, int filsz, int
origin,
+                   off_t set, off_t exp)
+{
+       off_t pos, exp2;
+       int x, ret;
+
+       assert(!(origin != SEEK_HOLE && origin != SEEK_DATA));
+
+       /*
+        * The file pointer can be set to different values depending
+        * on the implementation. For SEEK_HOLE, EOF could be a valid
+        * value. For SEEK_DATA, supplied offset could be the valid
+        * value.
+        */
+       exp2 = exp;
+       if (origin == SEEK_HOLE && exp2 != -1)
+               exp2 = filsz;
+       if (origin == SEEK_DATA && default_behavior && set < filsz)
+               exp2 = set;
+
+       pos = lseek(fd, set, origin);
+
+       if (pos == -1 && exp == -1) {
+               x = fprintf(stdout, "%02d.%02d %s expected -1 with errno %d, 
got %d. ",
+                           testnum, subtest,
+                           (origin == SEEK_HOLE) ? "SEEK_HOLE" : "SEEK_DATA",
+                           -ENXIO, -errno);
+               ret = !(errno == ENXIO);
+       } else {
+
+               x = fprintf(stdout, "%02d.%02d %s expected %ld or %ld, got %ld. 
",
+                           testnum, subtest,
+                           (origin == SEEK_HOLE) ? "SEEK_HOLE" : "SEEK_DATA",
+                           (long)exp, (long)exp2, (long)pos);
+               ret = !(pos == exp || pos == exp2);
+       }
+
+       fprintf(stdout, "%*s\n", (70 - x), ret ? "FAIL" : "succ");
+
+       return ret;
+}
+
+/*
+ * test file with unwritten extents, have both dirty and
+ * writeback pages in page cache.
+ */
+static int test09(int fd, int testnum)
+{      
+       int ret = 0;
+       char *buf = NULL;
+       int bufsz = alloc_size;
+       int filsz = 8 << 20;
+
+       /*
+        * HOLE - unwritten DATA in dirty page - HOLE -
+        * unwritten DATA in writeback page
+        */
+
+       /* Each unit is bufsz */
+       buf = do_malloc(bufsz);
+       if (!buf)
+               goto out;
+       memset(buf, 'a', bufsz);
+
+       /* preallocate 8M space to file */
+       ret = do_fallocate(fd, 0, filsz, 0);
+       if (ret < 0)
+               goto out;
+
+       ret = do_pwrite(fd, buf, bufsz, bufsz * 10);
+       if (!ret) {
+               ret = do_pwrite(fd, buf, bufsz, bufsz * 100);
+               if (ret)
+                       goto out;
+       }
+
+       /*
+        * Sync out dirty pages from bufsz * 100, this will convert
+        * the dirty page to writeback.
+        */
+       ret = do_sync_dirty_pages(fd, bufsz * 100, 0);
+       if (ret)
+               goto out;
+
+       /* offset at the beginning */
+       ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, 0);
+       ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, 1);
+       ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, bufsz * 10);
+       ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, bufsz * 10);
+
+out:
+       do_free(buf);
+       return ret;
+}
+
+/* test file with unwritten extent, only have writeback page */
+static int test08(int fd, int testnum)
+{
+       int ret = 0;
+       char *buf = NULL;
+       int bufsz = alloc_size;
+       int filsz = 4 << 20;
+
+       /* HOLE - unwritten DATA in writeback page */
+       /* Each unit is bufsz */
+       buf = do_malloc(bufsz);
+       if (!buf)
+               goto out;
+       memset(buf, 'a', bufsz);
+
+       /* preallocate 4M space to file */
+       ret = do_fallocate(fd, 0, filsz, 0);
+       if (ret < 0)
+               goto out;
+
+       ret = do_pwrite(fd, buf, bufsz, bufsz * 10);
+       if (ret)
+               goto out;
+
+       /* Sync out all file */
+       ret = do_sync_dirty_pages(fd, 0, 0);
+       if (ret)
+               goto out;
+
+       /* offset at the beginning */
+       ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, 0);
+       ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, 1);
+       ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, bufsz * 10);
+       ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, bufsz * 10);
+
+out:
+       do_free(buf);
+       return ret;
+}
+
+/*
+ * test file with unwritten extents, only have dirty pages
+ * in page cache.
+ */
+static int test07(int fd, int testnum)
+{
+       int ret = 0;
+       char *buf = NULL;
+       int bufsz = alloc_size;
+       int filsz = 4 << 20;
+
+       /* HOLE - unwritten DATA in dirty page */
+       /* Each unit is bufsz */
+       buf = do_malloc(bufsz);
+       if (!buf)
+               goto out;
+       memset(buf, 'a', bufsz);
+
+       /* preallocate 4M space to file */
+       ret = do_fallocate(fd, 0, filsz, 0);
+       if (ret < 0)
+               goto out;
+
+       ret = do_pwrite(fd, buf, bufsz, bufsz * 10);
+       if (ret)
+               goto out;
+
+       /* offset at the beginning */
+       ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, 0);
+       ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, 1);
+       ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, bufsz * 10);
+       ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, bufsz * 10);
+
+out:
+       do_free(buf);
+       return ret;
+}
+
+/* test hole data hole data */
+static int test06(int fd, int testnum)
+{
+       int ret = -1;
+       char *buf = NULL;
+       int bufsz = alloc_size;
+       int filsz = bufsz * 4;
+       int off;
+
+       /* HOLE - DATA - HOLE - DATA */
+       /* Each unit is bufsz */
+
+       buf = do_malloc(bufsz);
+       if (!buf)
+               goto out;
+
+       memset(buf, 'a', bufsz);
+
+       ret = do_pwrite(fd, buf, bufsz, bufsz);
+       if (!ret)
+               do_pwrite(fd, buf, bufsz, bufsz * 3);
+       if (ret)
+               goto out;
+
+       /* offset at the beginning */
+       ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, 0);
+       ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, 1);
+       ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, bufsz);
+       ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, bufsz);
+
+       /* offset around first hole-data boundary */
+       off = bufsz;
+       ret += do_lseek(testnum,  5, fd, filsz, SEEK_HOLE, off - 1, off - 1);
+       ret += do_lseek(testnum,  6, fd, filsz, SEEK_DATA, off - 1, off);
+       ret += do_lseek(testnum,  7, fd, filsz, SEEK_HOLE, off,     bufsz * 2);
+       ret += do_lseek(testnum,  8, fd, filsz, SEEK_DATA, off,     off);
+       ret += do_lseek(testnum,  9, fd, filsz, SEEK_HOLE, off + 1, bufsz * 2);
+       ret += do_lseek(testnum, 10, fd, filsz, SEEK_DATA, off + 1, off + 1);
+
+       /* offset around data-hole boundary */
+       off = bufsz * 2;
+       ret += do_lseek(testnum, 11, fd, filsz, SEEK_HOLE, off - 1, off);
+       ret += do_lseek(testnum, 12, fd, filsz, SEEK_DATA, off - 1, off - 1);
+       ret += do_lseek(testnum, 13, fd, filsz, SEEK_HOLE, off,     off);
+       ret += do_lseek(testnum, 14, fd, filsz, SEEK_DATA, off,     bufsz * 3);
+       ret += do_lseek(testnum, 15, fd, filsz, SEEK_HOLE, off + 1, off + 1);
+       ret += do_lseek(testnum, 16, fd, filsz, SEEK_DATA, off + 1, bufsz * 3);
+
+       /* offset around second hole-data boundary */
+       off = bufsz * 3;
+       ret += do_lseek(testnum, 17, fd, filsz, SEEK_HOLE, off - 1, off - 1);
+       ret += do_lseek(testnum, 18, fd, filsz, SEEK_DATA, off - 1, off);
+       ret += do_lseek(testnum, 19, fd, filsz, SEEK_HOLE, off,     filsz);
+       ret += do_lseek(testnum, 20, fd, filsz, SEEK_DATA, off,     off);
+       ret += do_lseek(testnum, 21, fd, filsz, SEEK_HOLE, off + 1, filsz);
+       ret += do_lseek(testnum, 22, fd, filsz, SEEK_DATA, off + 1, off + 1);
+
+       /* offset around the end of file */
+       off = filsz;
+       ret += do_lseek(testnum, 23, fd, filsz, SEEK_HOLE, off - 1, filsz);
+       ret += do_lseek(testnum, 24, fd, filsz, SEEK_DATA, off - 1, filsz - 1);
+       ret += do_lseek(testnum, 25, fd, filsz, SEEK_HOLE, off, -1);
+       ret += do_lseek(testnum, 26, fd, filsz, SEEK_DATA, off, -1);
+       ret += do_lseek(testnum, 27, fd, filsz, SEEK_HOLE, off + 1, -1);
+       ret += do_lseek(testnum, 28, fd, filsz, SEEK_DATA, off + 1, -1);
+
+out:
+       do_free(buf);
+       return ret;
+}
+
+/* test file with data at the beginning and a hole at the end */
+static int test05(int fd, int testnum)
+{
+       int ret = -1;
+       char *buf = NULL;
+       int bufsz = alloc_size;
+       int filsz = bufsz * 4;
+
+       /* |- DATA -|- HOLE -|- HOLE -|- HOLE -| */
+
+       buf = do_malloc(bufsz);
+       if (!buf)
+               goto out;
+       memset(buf, 'a', bufsz);
+
+       ret = do_truncate(fd, filsz);
+       if (!ret)
+               ret = do_pwrite(fd, buf, bufsz, 0);
+       if (ret)
+               goto out;
+
+       /* offset at the beginning */
+
+       ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, bufsz);
+       ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, bufsz);
+
+       ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, 0);
+       ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, 1);
+
+       /* offset around data-hole boundary */
+       ret += do_lseek(testnum,  5, fd, filsz, SEEK_HOLE, bufsz - 1, bufsz);
+       ret += do_lseek(testnum,  6, fd, filsz, SEEK_DATA, bufsz - 1, bufsz - 
1);
+
+       ret += do_lseek(testnum,  7, fd, filsz, SEEK_HOLE, bufsz,     bufsz);
+       ret += do_lseek(testnum,  8, fd, filsz, SEEK_DATA, bufsz,     -1);
+       ret += do_lseek(testnum,  9, fd, filsz, SEEK_HOLE, bufsz + 1, bufsz + 
1);
+       ret += do_lseek(testnum, 10, fd, filsz, SEEK_DATA, bufsz + 1, -1);
+
+       /* offset around eof */
+       ret += do_lseek(testnum, 11, fd, filsz, SEEK_HOLE, filsz - 1, filsz - 
1);
+       ret += do_lseek(testnum, 12, fd, filsz, SEEK_DATA, filsz - 1, -1);
+       ret += do_lseek(testnum, 13, fd, filsz, SEEK_HOLE, filsz,     -1);
+       ret += do_lseek(testnum, 14, fd, filsz, SEEK_DATA, filsz,     -1);
+       ret += do_lseek(testnum, 15, fd, filsz, SEEK_HOLE, filsz + 1, -1);
+       ret += do_lseek(testnum, 16, fd, filsz, SEEK_DATA, filsz + 1, -1);
+out:
+       do_free(buf);
+       return ret;
+}
+/* test hole begin and data end */
+static int test04(int fd, int testnum)
+{
+       int ret;
+       char *buf = "ABCDEFGH";
+       int bufsz, holsz, filsz;
+
+       bufsz = strlen(buf);
+       holsz = alloc_size * 2;
+       filsz = holsz + bufsz;
+
+       /* |- HOLE -|- HOLE -|- DATA -| */
+
+       ret = do_pwrite(fd, buf, bufsz, holsz);
+       if (ret)
+               goto out;
+
+       /* offset at the beginning */
+       ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, 0);
+       ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, 1);
+       ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, holsz);
+       ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, holsz);
+       /* offset around hole-data boundary */
+       ret += do_lseek(testnum,  5, fd, filsz, SEEK_HOLE, holsz - 1, holsz - 
1);
+       ret += do_lseek(testnum,  6, fd, filsz, SEEK_DATA, holsz - 1, holsz);
+       ret += do_lseek(testnum,  7, fd, filsz, SEEK_HOLE, holsz,     filsz);
+       ret += do_lseek(testnum,  8, fd, filsz, SEEK_DATA, holsz,     holsz);
+       ret += do_lseek(testnum,  9, fd, filsz, SEEK_HOLE, holsz + 1, filsz);
+       ret += do_lseek(testnum, 10, fd, filsz, SEEK_DATA, holsz + 1, holsz + 
1);
+
+       /* offset around eof */
+       ret += do_lseek(testnum, 11, fd, filsz, SEEK_HOLE, filsz - 1, filsz);
+       ret += do_lseek(testnum, 12, fd, filsz, SEEK_DATA, filsz - 1, filsz - 
1);
+       ret += do_lseek(testnum, 13, fd, filsz, SEEK_HOLE, filsz,     -1);
+       ret += do_lseek(testnum, 14, fd, filsz, SEEK_DATA, filsz,     -1);
+       ret += do_lseek(testnum, 15, fd, filsz, SEEK_HOLE, filsz + 1, -1);
+       ret += do_lseek(testnum, 16, fd, filsz, SEEK_DATA, filsz + 1, -1);
+out:
+       return ret;
+}
+
+/* test a larger full file */
+static int test03(int fd, int testnum)
+{
+       char *buf = NULL;
+       int bufsz = alloc_size * 2 + 100;
+       int filsz = bufsz;
+       int ret = -1;
+
+       buf = do_malloc(bufsz);
+       if (!buf)
+               goto out;
+       memset(buf, 'a', bufsz);
+
+       ret = do_pwrite(fd, buf, bufsz, 0);
+       if (ret)
+               goto out;
+
+       /* offset at the beginning */
+       ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, bufsz);
+       ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, bufsz);
+       ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, 0);
+       ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, 1);
+
+       /* offset around eof */
+       ret += do_lseek(testnum,  5, fd, filsz, SEEK_HOLE, bufsz - 1, bufsz);
+       ret += do_lseek(testnum,  6, fd, filsz, SEEK_DATA, bufsz - 1, bufsz - 
1);
+       ret += do_lseek(testnum,  7, fd, filsz, SEEK_HOLE, bufsz,     -1);
+       ret += do_lseek(testnum,  8, fd, filsz, SEEK_DATA, bufsz,     -1);
+       ret += do_lseek(testnum,  9, fd, filsz, SEEK_HOLE, bufsz + 1, -1);
+       ret += do_lseek(testnum, 10, fd, filsz, SEEK_DATA, bufsz + 1, -1);
+
+out:
+       do_free(buf);
+       return ret;
+}
+
+/* test tiny full file */
+static int test02(int fd, int testnum)
+{
+       int ret;
+       char buf[] = "ABCDEFGH";
+       int bufsz, filsz;
+
+       bufsz = strlen(buf);
+       filsz = bufsz;
+
+       /* |- DATA -| */
+
+       ret = do_pwrite(fd, buf, bufsz, 0);
+       if (ret)
+               goto out;
+
+       ret += do_lseek(testnum, 1, fd, filsz, SEEK_HOLE, 0, filsz);
+       ret += do_lseek(testnum, 2, fd, filsz, SEEK_DATA, 0, 0);
+       ret += do_lseek(testnum, 3, fd, filsz, SEEK_DATA, 1, 1);
+       ret += do_lseek(testnum, 4, fd, filsz, SEEK_HOLE, bufsz - 1, filsz);
+       ret += do_lseek(testnum, 5, fd, filsz, SEEK_DATA, bufsz - 1, bufsz - 1);
+       ret += do_lseek(testnum, 6, fd, filsz, SEEK_HOLE, bufsz,     -1);
+       ret += do_lseek(testnum, 7, fd, filsz, SEEK_DATA, bufsz,     -1);
+       ret += do_lseek(testnum, 8, fd, filsz, SEEK_HOLE, bufsz + 1, -1);
+       ret += do_lseek(testnum, 9, fd, filsz, SEEK_DATA, bufsz + 1, -1);
+
+out:
+       return ret;
+}
+
+/* test empty file */
+static int test01(int fd, int testnum)
+{
+       int ret = 0;
+
+       ret += do_lseek(testnum, 1, fd, 0, SEEK_DATA, 0, -1);
+       ret += do_lseek(testnum, 2, fd, 0, SEEK_HOLE, 0, -1);
+       ret += do_lseek(testnum, 3, fd, 0, SEEK_HOLE, 1, -1);
+
+       return ret;
+}
+
+struct testrec {
+       int     test_num;
+       int     (*test_func)(int fd, int testnum);
+       char    *test_desc;
+};
+
+struct testrec seek_tests[] = {
+       {  1, test01, "Test empty file" },
+       {  2, test02, "Test a tiny full file" },
+       {  3, test03, "Test a larger full file" },
+       {  4, test04, "Test file hole at beg, data at end" },
+       {  5, test05, "Test file data at beg, hole at end" },
+       {  6, test06, "Test file hole data hole data" },
+       {  7, test07, "Test file with unwritten extents, only have dirty
pages" },
+       {  8, test08, "Test file with unwritten extents, only have
unwritten pages" },
+       {  9, test09, "Test file with unwritten extents, have both dirty
&& unwritten pages" },
+};
+
+static int run_test(struct testrec *tr)
+{
+       int ret = 0, fd = -1;
+       char filename[255];
+
+       snprintf(filename, sizeof(filename), "%s%02d", base_file_path,
tr->test_num);
+
+       fd = do_create(filename);
+       if (fd > -1) {
+               printf("%02d. %-50s\n", tr->test_num, tr->test_desc);
+               ret = tr->test_func(fd, tr->test_num);
+               printf("\n");
+       }
+
+       do_close(fd);
+       return ret;
+}
+
+static int test_basic_support(void)
+{
+       int ret = -1, fd;
+       off_t pos;
+       char *buf = NULL;
+       int bufsz, filsz;
+
+       fd = do_create(base_file_path);
+       if (fd == -1)
+               goto out;
+
+       get_file_system(fd);
+
+       ret = get_io_sizes(fd);
+       if (ret)
+               goto out;
+
+       bufsz = alloc_size * 2;
+       filsz = bufsz * 2;
+
+       buf = do_malloc(bufsz);
+       if (!buf)
+               goto out;
+       memset(buf, 'a', bufsz);
+
+       /* File with 2 allocated blocks.... */
+       ret = do_pwrite(fd, buf, bufsz, 0);
+       if (ret)
+               goto out;
+
+       /* followed by a hole... */
+       ret = do_truncate(fd, filsz);
+       if (ret)
+               goto out;
+
+       /* Is SEEK_DATA and SEEK_HOLE supported in the kernel? */
+       pos = lseek(fd, 0, SEEK_DATA);
+       if (pos != -1)
+               pos = lseek(fd, 0, SEEK_HOLE);
+       if (pos == -1) {
+               fprintf(stderr, "Kernel does not support llseek(2) extensions "
+                       "SEEK_HOLE and/or SEEK_DATA. Aborting.\n");
+               ret = -1;
+               goto out;
+       }
+
+       if (pos == filsz) {
+               default_behavior = 1;
+               fprintf(stderr, "File system supports the default behavior.\n");
+       }
+
+       printf("\n");
+
+out:
+       do_free(buf);
+       do_close(fd);
+       return ret;
+}
+
+int main(int argc, char **argv)
+{
+       int ret = -1;
+       int i = 0;
+       int numtests = sizeof(seek_tests) / sizeof(struct testrec);
+
+       if (argc != 2) {
+               fprintf(stdout, "Usage: %s base_file_path\n", argv[0]);
+               return ret;
+       }
+
+       base_file_path = (char *)strdup(argv[1]);
+
+       ret = test_basic_support();
+       if (ret)
+               goto out;
+
+       for (i = 0; i < numtests; ++i) {
+               if (ret)
+                       goto out;
+               run_test(&seek_tests[i]);
+       }
+
+out:
+       free(base_file_path);
+       return ret;
+}
-- 
1.7.4.1

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