fill files with random data

snapshot data integrity test-case needs filesystem with random data.

Signed-off-by: Anand Jain <Anand.Jain@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/common.rc b/common.rc
index e948169b554cdf166e8a9a9dd04630da37559f5d..37379a5e0495fe6c2f297cfdeb2dd40d86349268 100644 (file)
--- a/common.rc
+++ b/common.rc
@@ -1490,6 +1490,7 @@ _die()
         exit 1
 }
 
+#takes files, randomdata
 _nfiles()
 {
         f=0
@@ -1498,20 +1499,24 @@ _nfiles()
                 file=f$f
                 echo > $file
                 if [ $size -gt 0 ]; then
-                    dd if=/dev/zero of=$file bs=1024 count=$size
+                    if [ $2 == false ]; then
+                        dd if=/dev/zero of=$file bs=1024 count=$size 2>&1 | _filter_dd
+                    else
+                        dd if=/dev/urandom of=$file bs=1024 count=$size 2>&1 | _filter_dd
+                    fi
                 fi
                let f=$f+1
         done
 }
 
-# takes dirname, depth
+# takes dirname, depth, randomdata
 _descend()
 {
-        dirname=$1; depth=$2
+        dirname=$1; depth=$2; randomdata=$3
         mkdir $dirname  || die "mkdir $dirname failed"
         cd $dirname
 
-        _nfiles $files           # files for this dir
+        _nfiles $files $randomdata          # files for this dir and data type
 
         [ $depth -eq 0 ] && return
        let deep=$depth-1 # go 1 down
@@ -1529,7 +1534,7 @@ _descend()
 
 # Populate a filesystem with inodes for performance experiments
 #
-# usage: populate [-v] [-n ndirs] [-f nfiles] [-d depth] [-r root] [-s size]
+# usage: populate [-v] [-n ndirs] [-f nfiles] [-d depth] [-r root] [-s size] [-x]
 #
 _populate_fs()
 {
@@ -1540,8 +1545,9 @@ _populate_fs()
     depth=2         # depth of tree from root to leaves
     verbose=false
     root=root       # path of initial root of directory tree
+    randomdata=false # -x data type urandom or zero
 
-    while getopts "d:f:n:r:s:v" c
+    while getopts "d:f:n:r:s:v:x" c
     do
         case $c in
         d)      depth=$OPTARG;;
@@ -1550,10 +1556,11 @@ _populate_fs()
         s)      size=$OPTARG;;
         v)      verbose=true;;
         r)      root=$OPTARG;;
+        x)      randomdata=true;;
         esac
     done
 
-    _descend $root $depth
+    _descend $root $depth $randomdata
     wait
 
     cd $here