[PATCH] generic: detect preallocation support for fsx tests 075 and 112

[Christoph Hellwig <hch@lst.de>]

Currently generic/075 and generic/112 have two extra fsx passes each that
exercise fsx with preallocation, which are only enabled for XFS.

These tests can also be run with other file systems, given that the XFS
prealloc ioctls are implemented in generic code since the addition of
the fallocate system call.  This also means a version of XFS that does
not support preallocation (e.g. because it always writes out of place)
can skip the prealloc tests while still completing the normal fsx tests
just fine.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/generic/075 | 16 +++++++++++-----
 tests/generic/112 | 20 +++++++++++++-------
 2 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/tests/generic/075 b/tests/generic/075
index 2b957891..8981c560 100755
--- a/tests/generic/075
+++ b/tests/generic/075
@@ -48,11 +48,12 @@ _do_test()
     echo "fsx.$_n : $_filter_param"
     echo "-----------------------------------------------"
 
-    if [ "$FSTYP" != "xfs" ]
-    then
-	if [ "$_n" = "1" -o "$_n" = "3" ]
-	then
-	    # HACK: only xfs handles preallocation (-x) so just skip this test
+    if [ "$_n" = "1" -o "$_n" = "3" ]; then
+        if echo $testio | grep -q "Operation not supported"; then
+	    #
+	    # Skip the prealloc runs if the file system does not support
+	    # preallocation
+	    #
 	    return
 	fi
     fi
@@ -128,6 +129,11 @@ echo "brevity is wit..."
 
 _check_test_fs
 
+# check if preallocation is supported
+testfile=$TEST_DIR/$$.xfs_io
+testio=`$XFS_IO_PROG -F -f -c "falloc 0 1m" $testfile 2>&1`
+rm -f $testfile 2>&1 > /dev/null
+
 # Options:
 # -d: debug output for all operations
 # -l flen: the upper bound on file size (default 262144)
diff --git a/tests/generic/112 b/tests/generic/112
index 1879e7b5..a6f8fc14 100755
--- a/tests/generic/112
+++ b/tests/generic/112
@@ -48,13 +48,14 @@ _do_test()
     echo "fsx.$_n : $_filter_param"
     echo "-----------------------------------------------"
 
-    if [ "$FSTYP" != "xfs" ]
-    then
-        if [ "$_n" = "1" -o "$_n" = "3" ]
-        then
-            # HACK: only xfs handles preallocation (-x) so just skip this test
-            return
-        fi
+    if [ "$_n" = "1" -o "$_n" = "3" ]; then
+        if echo $testio | grep -q "Operation not supported"; then
+	    #
+	    # Skip the prealloc runs if the file system does not support
+	    # preallocation
+	    #
+	    return
+	fi
     fi
 
     # This cd and use of -P gets full debug on $here (not TEST_DEV)
@@ -128,6 +129,11 @@ echo "brevity is wit..."
 
 _check_test_fs
 
+# check if preallocation is supported
+testfile=$TEST_DIR/$$.xfs_io
+testio=`$XFS_IO_PROG -F -f -c "falloc 0 1m" $testfile 2>&1`
+rm -f $testfile 2>&1 > /dev/null
+
 # Options:
 # -d: debug output for all operations
 # -l flen: the upper bound on file size (default 262144)
-- 
2.20.1