btrfs-progs: tests: correctly receive clones to mounted subvol

clone needs to resolve the paths of the involved subvolumes in the target
fs from their UUIDs. When doing so it might need to strip the prefix
that is mounted as the root of the fs from those paths.

It didn't do so correctly when processing the source of "clone" commands

This is a regression test for
    btrfs-progs: receive: handle root subvol path in clone

Signed-off-by: Benedikt Morbach <benedikt.morbach@googlemail.com>
[ copied the fstests version, will be updated later ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/tests/misc-tests/019-receive-clones-on-munted-subvol/test.sh b/tests/misc-tests/019-receive-clones-on-munted-subvol/test.sh
new file mode 100755 (executable)
index 0000000..b32a59a
--- /dev/null
+++ b/tests/misc-tests/019-receive-clones-on-munted-subvol/test.sh
@@ -0,0 +1,179 @@
+#! /bin/bash
+#
+# Test that an incremental send operation works when in both snapshots there are
+# two directory inodes that have the same number but different generations and
+# have an entry with the same name that corresponds to different inodes in each
+# snapshot.
+
+# temporary, until the test gets adapted
+exit 0
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+tmp=/tmp/$$
+status=1    # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+    cd /
+    rm -fr $send_files_dir
+    rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs btrfs
+_supported_os Linux
+_require_test
+_require_scratch
+_require_cloner
+_require_fssum
+
+send_files_dir=$TEST_DIR/btrfs-test-$seq
+
+rm -f $seqres.full
+rm -fr $send_files_dir
+mkdir $send_files_dir
+
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+
+BLOCK_SIZE=$(_get_block_size $SCRATCH_MNT)
+
+# create source fs
+
+$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/foo | _filter_scratch
+$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/bar | _filter_scratch
+$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/baz | _filter_scratch
+$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/snap | _filter_scratch
+
+$XFS_IO_PROG -s -f -c "pwrite -S 0xaa -b $((32 * $BLOCK_SIZE)) 0 $((32 * $BLOCK_SIZE))" \
+             $SCRATCH_MNT/foo/file_a | _filter_xfs_io_blocks_modified
+$XFS_IO_PROG -s -f -c "pwrite -S 0xbb -b $((32 * $BLOCK_SIZE)) 0 $((32 * $BLOCK_SIZE))" \
+             $SCRATCH_MNT/bar/file_b | _filter_xfs_io_blocks_modified
+
+$CLONER_PROG $SCRATCH_MNT/{foo/file_a,baz/file_a}
+$CLONER_PROG $SCRATCH_MNT/{bar/file_b,baz/file_b}
+
+# Filesystem looks like:
+#
+# .
+# |--- foo/
+# |       |--- file_a
+# |--- bar/
+# |       |--- file_b
+# |--- baz/
+# |       |--- file_a                   (clone of "foo/file_a")
+# |       |--- file_b                   (clone of "bar/file_b")
+# |--- snap/
+#
+
+# create snapshots and send streams
+
+$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT/foo \
+    $SCRATCH_MNT/snap/foo.0 > /dev/null
+
+$BTRFS_UTIL_PROG send $SCRATCH_MNT/snap/foo.0   \
+    -f $send_files_dir/foo.0.snap               \
+    2>&1 1>/dev/null | _filter_scratch
+
+$BTRFS_UTIL_PROG subvolume snapshot -r          \
+    $SCRATCH_MNT/bar $SCRATCH_MNT/snap/bar.0    \
+    > /dev/null
+
+$BTRFS_UTIL_PROG send $SCRATCH_MNT/snap/bar.0   \
+    -f $send_files_dir/bar.0.snap               \
+    2>&1 1>/dev/null | _filter_scratch
+
+$CLONER_PROG $SCRATCH_MNT/foo/file_a{,.clone}
+rm $SCRATCH_MNT/foo/file_a
+
+$BTRFS_UTIL_PROG subvolume snapshot -r          \
+    $SCRATCH_MNT/foo $SCRATCH_MNT/snap/foo.1    \
+    > /dev/null
+
+$BTRFS_UTIL_PROG send                           \
+    -p $SCRATCH_MNT/snap/foo.0                  \
+    -f $send_files_dir/foo.1.snap               \
+    $SCRATCH_MNT/snap/foo.1                     \
+    2>&1 1>/dev/null | _filter_scratch
+
+$BTRFS_UTIL_PROG subvolume snapshot -r          \
+    $SCRATCH_MNT/baz $SCRATCH_MNT/snap/baz.0    \
+    > /dev/null
+
+$BTRFS_UTIL_PROG send                           \
+    -p $SCRATCH_MNT/snap/foo.1                  \
+    -c $SCRATCH_MNT/snap/bar.0                  \
+    -f $send_files_dir/baz.0.snap               \
+    $SCRATCH_MNT/snap/baz.0                     \
+    2>&1 1>/dev/null | _filter_scratch
+
+# Filesystem looks like:
+#
+# .
+# |--- foo/
+# |       |--- file_a.clone             (clone of "foo/file_a")
+# |--- bar/
+# |       |--- file_b
+# |--- baz/
+# |       |--- file_a                   (clone of "foo/file_a")
+# |       |--- file_b                   (clone of "bar/file_b")
+# |--- snap/
+#          |--- bar.0/                  (snapshot of "bar")
+#          |         |--- file_b
+#          |--- foo.0/                  (snapshot of "foo")
+#          |         |--- file_a
+#          |--- foo.1/                  (snapshot of "foo")
+#          |         |--- file_a.clone
+#          |--- baz.0/                  (snapshot of "baz")
+#          |         |--- file_a
+#          |         |--- file_b
+
+run_check $FSSUM_PROG -A -f -w $send_files_dir/foo.0.fssum $SCRATCH_MNT/snap/foo.0
+run_check $FSSUM_PROG -A -f -w $send_files_dir/foo.1.fssum $SCRATCH_MNT/snap/foo.1
+run_check $FSSUM_PROG -A -f -w $send_files_dir/bar.0.fssum $SCRATCH_MNT/snap/bar.0
+run_check $FSSUM_PROG -A -f -w $send_files_dir/baz.0.fssum $SCRATCH_MNT/snap/baz.0
+
+_scratch_unmount
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/dest | _filter_scratch
+_scratch_unmount
+_scratch_mount -o subvol=/dest
+
+$BTRFS_UTIL_PROG receive            \
+    -f $send_files_dir/foo.0.snap   \
+    $SCRATCH_MNT                    \
+    2>&1 | _filter_scratch
+$BTRFS_UTIL_PROG receive            \
+    -f $send_files_dir/bar.0.snap   \
+    $SCRATCH_MNT                    \
+    2>&1 | _filter_scratch
+
+# if "dest/" is not correctly stripped from the beginning of the path to "foo.0" in the target fs,
+# we would get an error here because the clone source "foo.0/file_a" for "foo.1/file_a.clone" can't be found.
+$BTRFS_UTIL_PROG receive            \
+    -f $send_files_dir/foo.1.snap   \
+    $SCRATCH_MNT                    \
+    2>&1 | _filter_scratch
+
+# same here, but with send -c instead of -p
+$BTRFS_UTIL_PROG receive            \
+    -f $send_files_dir/baz.0.snap   \
+    $SCRATCH_MNT                    \
+    2>&1 | _filter_scratch
+
+run_check $FSSUM_PROG -r $send_files_dir/foo.0.fssum $SCRATCH_MNT/foo.0
+run_check $FSSUM_PROG -r $send_files_dir/foo.1.fssum $SCRATCH_MNT/foo.1
+run_check $FSSUM_PROG -r $send_files_dir/bar.0.fssum $SCRATCH_MNT/bar.0
+run_check $FSSUM_PROG -r $send_files_dir/baz.0.fssum $SCRATCH_MNT/baz.0
+
+status=0
+exit