os/FuseStore: only flush if dirty

No need to rewrite the object unless it was changed. This partially fixes truncate. Signed-off-by: Sage Weil <[email protected]>
att · Sep 7, 2016 · 265730a · 265730a
1 parent b6870a6
commit 265730a
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diff --git a/qa/workunits/objectstore/test_fuse.sh b/qa/workunits/objectstore/test_fuse.sh
@@ -81,9 +81,13 @@ test ! -s $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
 echo asdfasdfasdf > $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
 test -s $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
 grep -q asdfasdfasdf $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
+truncate --size 4 $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
+stat --format=%s $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data | grep -q ^4$
+expect_false grep -q asdfasdfasdf $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
 rm $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
 test ! -s $MNT/meta/all/#-1:7b3f43c4:::osd_superblock:0#/data
 
+
 # create pg collection
 mkdir --mode 0003 $MNT/0.0_head
 cat $MNT/0.0_head/bitwise_hash_bits