3 # Copyright (C) 2019 Red Hat Inc.
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20 # THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
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30 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 # Regression test when next_ops->get_size changes between connections.
34 # For now, NBD does not support dynamic resize; but the file plugin
35 # reads size from the file system for each new connection, at which
36 # point the client remembers that size for the life of the connection.
37 # We are testing that connection A can still see the tail of a file,
38 # even when connection B is opened while the file was temporarily
39 # shorter (if the actions of connection B affect the size visible
40 # through connection A, we didn't isolate per-connection state).
46 requires qemu-io
--version
49 files
="truncate4.out truncate4.pid $sock truncate4.data"
51 cleanup_fn
rm -f $files
53 # Initial file contents: 1k of pattern 1
54 truncate
-s 1024 truncate4.data
55 qemu-io
-c 'w -P 1 0 1024' -f raw truncate4.data
57 # Run nbdkit with file plugin and truncate filter in front.
58 start_nbdkit
-P truncate4.pid
-U $sock \
64 exec 4>&1 # Save original stdout
66 exec 5>&1 >&4 # Save connection A, set stdout back to original
67 echo 'Reading from connection A, try 1'
68 echo 'r -P 1 0 1024' >&5
71 truncate
-s 512 truncate4.data
72 echo 'Reading from connection B'
73 echo 'r -P 1 0 512' | qemu-io
-f raw nbd
:unix
:$sock >> truncate4.out
75 truncate
-s 1024 truncate4.data
76 qemu-io
-c 'w -P 2 0 1024' -f raw truncate4.data
77 echo 'Reading from connection A, try 2'
78 echo 'r -P 2 512 512' >&5
80 } | qemu-io
-f raw nbd
:unix
:$sock >> truncate4.out || fail
=1
84 grep 'Pattern verification failed' truncate4.out
&& fail
=1