uss/gluster: generate gfid for snapshot files from snapname and gfid

If 'a' and 'b' are hardlinks, we need to generate a virtual
gfid for these files so that the inode number for 'a' and 'b'
are same.

Generate gfid as below:
gfid_of_a = MD5(snapname + back_end_gfid(a))
if '/dir1/a' and '/dir2/b' are hardlinks, then inode number should be
same for
all below files:
/mnt/.snaps/snap1/dir1/a
/mnt/.snaps/snap1/dir2/b
/mnt/dir1/.snaps/snap1/a
/mnt/dir2/.snaps/snap1/b

Change-Id: Ifda793455610e554f3f1e4cbb90d44c02cda4b0f
BUG: 1171703
Signed-off-by: vmallika <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/9255
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>

1 files changed, 30 insertions, 2 deletions

diff --git a/tests/basic/uss.t b/tests/basic/uss.t
index 7a4f043d260..55fab660aa2 100644
--- a/tests/basic/uss.t
+++ b/tests/basic/uss.t
@@ -41,7 +41,14 @@ TEST $GFS --volfile-server=$H0 --volfile-id=$V0 $M0;
 
 for i in {1..10} ; do echo "file" > $M0/file$i ; done
 
+# Create file and hard-links
+TEST touch $M0/f1
+TEST mkdir $M0/dir
+TEST ln $M0/f1 $M0/f2
+TEST ln $M0/f1 $M0/dir/f3
+
 TEST $CLI snapshot config activate-on-create enable
+TEST $CLI volume set $V0 features.uss enable;
 
 TEST $CLI snapshot create snap1 $V0 no-timestamp;
 
@@ -49,6 +56,29 @@ for i in {11..20} ; do echo "file" > $M0/file$i ; done
 
 TEST $CLI snapshot create snap2 $V0 no-timestamp;
 
+########### Test inode numbers ###########
+s1_f1_ino=$(STAT_INO $M0/.snaps/snap1/f1)
+TEST [ $s1_f1_ino != 0 ]
+
+# Inode number of f1 should be same as f2 f3 within snapshot
+EXPECT $s1_f1_ino STAT_INO $M0/.snaps/snap1/f2
+EXPECT $s1_f1_ino STAT_INO $M0/.snaps/snap1/dir/f3
+EXPECT $s1_f1_ino STAT_INO $M0/dir/.snaps/snap1/f3
+
+# Inode number of f1 in snap1 should be different from f1 in snap2
+tmp_ino=$(STAT_INO $M0/.snaps/snap2/f1)
+TEST [ $s1_f1_ino != $tmp_ino ]
+
+# Inode number of f1 in snap1 should be different from f1 in regular volume
+tmp_ino=$(STAT_INO $M0/f1)
+TEST [ $s1_f1_ino != $tmp_ino ]
+
+# Directory inode of snap1 should be different in each sub-dir
+s1_ino=$(STAT_INO $M0/.snaps/snap1)
+tmp_ino=$(STAT_INO $M0/dir/.snaps/snap1)
+TEST [ $s1_ino != $tmp_ino ]
+##########################################
+
 mkdir $M0/dir1;
 mkdir $M0/dir2;
 
@@ -80,8 +110,6 @@ TEST ! $CLI volume set $V0 features.snapshot-directory .
 TEST ! $CLI volume set $V0 features.snapshot-directory ..
 TEST ! $CLI volume set $V0 features.snapshot-directory .123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345
 
-TEST $CLI volume set $V0 features.uss enable;
-
 EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
 
 TEST $GFS --volfile-server=$H0 --volfile-id=$V0 $M0;