[PATCH V3] xfstests: make 275 pass

[Eric Sandeen <sandeen@sandeen.net>]

Ok, this is a significant rework of 275, which made too many
assumptions about details of space usage and failed on several
filesystems (it passed on xfs, but only by accident).

This new version tries to leave about 256k free, then tries
a single 1M IO, and fails only if 0 bytes are written.

It also sends a lot more to $seq.full for debugging on failure
and fixes a few other stylistic things.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

V2: bunch of fixups from V1 ;)
V3: use ls for size check, and 2g fs size

diff --git a/275 b/275
index 214262e..69b2895 100755
--- a/275
+++ b/275
@@ -1,8 +1,8 @@
 #! /bin/bash
 # FS QA Test No. 275
 #
-# The posix write test. when write size is larger than disk free size,
-# should write as more as possible
+# The posix write test.  When write size is larger than disk free size,
+# should write as much as possible until ENOSPC.
 #
 #-----------------------------------------------------------------------
 # Copyright (c) 2011-2012 Fujitsu, Inc.  All Rights Reserved.
@@ -30,13 +30,12 @@ echo "QA output created by $seq"
 
 here=`pwd`
 tmp=/tmp/$$
-status=0    # success is the default!
+status=1    # failure is the default!
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 _cleanup()
 {
 	cd /
-	rm -f $SCRATCH_MNT/* $tmp.*
 	_scratch_unmount
 }
 
@@ -49,41 +48,48 @@ _supported_os IRIX Linux
 _require_scratch
 
 echo "------------------------------"
-echo "write lack test"
+echo "write until ENOSPC test"
 echo "------------------------------"
 
 rm -f $seq.full
 
 umount $SCRATCH_DEV 2>/dev/null
-_scratch_mkfs_sized $((1 * 1024 * 1024 * 1024)) >>$seq.full 2>&1
+_scratch_mkfs_sized $((2 * 1024 * 1024 * 1024)) >>$seq.full 2>&1
 _scratch_mount
 
 rm -rf $SCRATCH_MNT/*
-cd $SCRATCH_MNT
 
-dd if=/dev/zero of=tmp1 bs=4K count=1 >/dev/null 2>&1
-if [ $? -ne 0 ]
-then
-	echo "create file err"
-	status=1
-	exit
-fi
+dd if=/dev/zero of=$SCRATCH_MNT/tmp1 bs=256K count=1 >>$seq.full 2>&1
+[ $? -ne 0 ] && _fail "Error creating file"
 
-dd if=/dev/zero of=tmp2 bs=1M >/dev/null 2>&1
-dd if=/dev/zero of=tmp3 bs=4K >/dev/null 2>&1
+# Attempt to completely fill fs
+dd if=/dev/zero of=$SCRATCH_MNT/tmp2 bs=1M >>$seq.full 2>&1
 sync
+dd if=/dev/zero of=$SCRATCH_MNT/tmp3 bs=4K >>$seq.full 2>&1
+sync
+# Last effort, use O_SYNC
+dd if=/dev/zero of=$SCRATCH_MNT/tmp4 bs=4K oflag=sync >>$seq.full 2>&1
+# Save space usage info to the full file
+echo "Pre rm space:" >> $seq.full
+df $SCRATCH_MNT >>$seq.full 2>&1
 
-rm -f tmp1
+# Should leave approx 256k free
+rm -f $SCRATCH_MNT/tmp1
 sync
+echo "Post rm space:" >> $seq.full
+df $SCRATCH_MNT >>$seq.full 2>&1
+_freespace=`df -k $SCRATCH_MNT | tail -n 1 | awk '{print $4}'`
+[ $_freespace -gt 1024 ] && _fail "could not sufficiently fill filesystem"
+
+# Try a write larger than available space
+dd if=/dev/zero of=$SCRATCH_MNT/tmp1 bs=1M count=1 >>$seq.full 2>&1
+echo "Bytes written until ENOSPC:" >>$seq.full
+du $SCRATCH_MNT/tmp1 >>$seq.full
 
-dd if=/dev/zero of=tmp1 bs=8K count=1 >/dev/null 2>&1
-_filesize=`du tmp1 | awk '{print $1}'`
-if [ $_filesize -ne 4 ]
-then
-	echo "write file err"
-	status=1
-	exit
-fi
+# And at least some of it should succeed.
+_filesize=`ls -l $SCRATCH_MNT/tmp1 | awk '{print $5}'`
+[ $_filesize -eq 0 ] && _fail "write file err: Partial write until enospc failed; wrote 0 bytes."
 
 echo "done"
+status=0
 exit
diff --git a/275.out b/275.out
index 30af43c..69b9d52 100644
--- a/275.out
+++ b/275.out
@@ -1,5 +1,5 @@
 QA output created by 275
 ------------------------------
-write lack test
+write until ENOSPC test
 ------------------------------
 done


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