xfs: refactor minimum log size formatting code

[xfstests-dev.git] / common / xfs

diff --git a/common/xfs b/common/xfs
index af2b62ba920a8a069fe31abd58963800aae783f7..42f02ff73b36bd11754d68593153ce44fb1409a9 100644 (file)
--- a/common/xfs
+++ b/common/xfs
@@ -77,6 +77,42 @@ _scratch_mkfs_xfs_supported()
        return $mkfs_status
 }
 
+# Returns the minimum XFS log size, in units of log blocks.
+_scratch_find_xfs_min_logblocks()
+{
+       local mkfs_cmd="`_scratch_mkfs_xfs_opts`"
+
+       # The smallest log size we can specify is 2M (XFS_MIN_LOG_BYTES) so
+       # pass that in and see if mkfs succeeds or tells us what is the
+       # minimum log size.
+       local XFS_MIN_LOG_BYTES=2097152
+
+       _scratch_do_mkfs "$mkfs_cmd" "cat" $* -N -l size=$XFS_MIN_LOG_BYTES \
+               2>$tmp.mkfserr 1>$tmp.mkfsstd
+       local mkfs_status=$?
+
+       # mkfs suceeded, so we must pick out the log block size to do the
+       # unit conversion
+       if [ $mkfs_status -eq 0 ]; then
+               local blksz="$(grep '^log.*bsize' $tmp.mkfsstd | \
+                       sed -e 's/log.*bsize=\([0-9]*\).*$/\1/g')"
+               echo $((XFS_MIN_LOG_BYTES / blksz))
+               return
+       fi
+
+       # Usually mkfs will tell us the minimum log size...
+       if grep -q 'minimum size is' $tmp.mkfserr; then
+               grep 'minimum size is' $tmp.mkfserr | \
+                       sed -e 's/^.*minimum size is \([0-9]*\) blocks/\1/g'
+               return
+       fi
+
+       # Don't know what to do, so fail
+       echo "Cannot determine minimum log size" >&2
+       cat $tmp.mkfsstd >> $seqres.full
+       cat $tmp.mkfserr >> $seqres.full
+}
+
 _scratch_mkfs_xfs()
 {
        local mkfs_cmd="`_scratch_mkfs_xfs_opts`"