1libnbd-release-notes-1.8(1) LIBNBD libnbd-release-notes-1.8(1)
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6 libnbd-release-notes-1.8 - release notes for libnbd 1.8
7
9 These are the release notes for libnbd stable release 1.8. This
10 describes the major changes since 1.6.
11 libnbd 1.8.0 was released on 7 June 2021.
13 libnbd is now hosted on gitlab:
15 https://listman.redhat.com/archives/libguestfs/2021-February/msg00021.html
16 Security
18 If you find a security issue, please read SECURITY in the source
19 (online here: https://gitlab.com/nbdkit/libnbd/blob/master/SECURITY).
20 To find out about previous security issues in libnbd, see
21 libnbd-security(3).
22 There was one security bug found in libnbd during this release cycle.
24 CVE-2021-20286 denial of service when using nbd_set_opt_mode(3)
26 See the full announcement here:
28 https://listman.redhat.com/archives/libguestfs/2021-March/msg00092.html
29 (Found and fixed by Eric Blake).
30 New APIs
32 nbd_get_private_data(3)
33 nbd_set_private_data(3)
34 These calls allow you to store either an unsigned integer or a
35 pointer in the handle for the application to use for its own
36 purposes.
37 nbd_get_uri(3)
39 This call constructs an NBD URI which can be used to connect back
40 to the same server (using nbd_connect_uri(3) or from other tools
41 that support the NBD URI standard).
42 Enhancements to existing APIs
44 Numeric IPv6 URIs (like "nbd://[::1]/") are now supported.
45 libnbd gives a better error message if the server backlog overflows
47 (thanks Xin Long, Lukas Doktor, Eric Blake, Martin Kletzander).
48 New features
50 Continuous integration (CI) tests now run on every commit and merge
51 request to the upstream repository (Martin Kletzander).
52 Tools
54 A great deal of work has been done to improve the performance of
55 nbdcopy(1) (Nir Soffer, Eric Blake).
56 On Linux, nbdcopy now uses readahead when reading from files, and takes
58 steps to preserve the host page cache.
59 nbdcopy new --request-size option to allow controlling the size of
61 requests made to NBD servers. Adjusting this can affect performance
62 (Nir Soffer).
63 nbdcopy now supports "null:" pseudo-target, where it discards the
65 output. This is useful for benchmarking.
66 nbdcopy new -v flag to enable libnbd and other debugging.
68 nbdinfo(1) --list (which lists all exports of a server) no longer exits
70 early if one of the exports is inaccessible or there is a recoverable
71 error (Eric Blake).
72 nbdinfo now prints the URI of each export in the output making it
74 easier to connect back to each export.
75 nbdfuse(1) is now multithreaded and supports issuing parallel NBD
77 commands on a single connection as well as multi-conn, and other
78 enhancements have been made. This resulted in around 50% performance
79 improvement when tested with fio.
80 nbdfuse now supports nbdcopy-style "[ CMD ]", eg:
82 nbdfuse dir/ramdisk [ nbdkit memory 1G ]
83 nbdfuse now supports trimming. Also it supports fast zeroing, but this
85 requires a forthcoming kernel patch before it will work.
86 nbdfuse sets the virtual file permissions appropriately if the NBD
88 export is read-only.
89 nbdfuse new -v flag to enable libnbd and other debugging.
91 Tests
93 Added a test of interoperability with qemu-storage-daemon(1). Note
94 that qemu-storage-daemon was broken in qemu 6.0.0 so this test can fail
95 unless you update to a fixed version (thanks Stefan Hajnoczi, Daniel
96 Berrangé).
97 Added a test of nbdcopy with TLS which was previously untested.
99 Python code style tests are now opt-in using
101 ./configure --enable-python-code-style
102 More tests should now run on FreeBSD and not be skipped.
104 nbdfuse tests now ensure that errors from NBD are transmitted through
106 FUSE back to the local client.
107 "MALLOC_CHECK_" and "MALLOC_PERTURB_" are only enabled when running the
109 tests, not when running libnbd programs from the build directory. This
110 makes it easier to do benchmarks.
111 Other improvements and bug fixes
113 The minimum C compiler is now ISO C99 (previously ANSI C90).
114 FUSE 3 (instead of FUSE 2) is now required to build nbdfuse.
116 The library tries harder not to leak thread-local storage memory on
118 dlclose or exit. (Because of the design of Linux it is not always
119 possible to avoid this, especially in multithreaded programs.)
120 Fix the progress bar in nbdcopy(1).
122 UTF-8 export names are now processed and displayed properly by
124 nbdinfo(1).
125 The --help output of nbdcopy, nbdfuse and nbdinfo now displays a brief
127 summary of all options and has some examples.
128 The generator now only requires ocamlc, not ocamlfind (Abhay Raj
130 Singh).
131 Golang bindings now use and require golang modules.
133 Documentation
135 Document using libnbd with the Meson build system.
136 Added Python examples.
138 Add example of how to integrate libnbd with libev (Nir Soffer).
140
142 libnbd(3).
143
145 Eric Blake
146 Richard W.M. Jones
148 Martin Kletzander
150 Nir Soffer
152
154 Copyright (C) 2021 Red Hat Inc.
155
157 This library is free software; you can redistribute it and/or modify it
158 under the terms of the GNU Lesser General Public License as published
159 by the Free Software Foundation; either version 2 of the License, or
160 (at your option) any later version.
161 This library is distributed in the hope that it will be useful, but
163 WITHOUT ANY WARRANTY; without even the implied warranty of
164 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
165 Lesser General Public License for more details.
166 You should have received a copy of the GNU Lesser General Public
168 License along with this library; if not, write to the Free Software
169 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
170 02110-1301 USA
171libnbd-1.14.2 2023-01-03 libnbd-release-notes-1.8(1)