6:32 a.m.
This thread from a little over a year ago:
http://lists.wpkg.org/pipermail/sheepdog/2019-March/thread.html
states that sheepdog is no longer actively developed. The only mentioned
users are some companies who are said to have it for legacy reasons with
plans to replace it by Ceph. There is talk about cutting out existing
features to turn it into a simple demo of how to write a distributed
block service. There is no evidence of anyone working on that idea:
https://github.com/sheepdog/sheepdog/commits/master
No real commits to git since Jan 2018, and before then just some minor
technical debt cleanup.
There is essentially no activity on the mailing list aside from
patches to QEMU that get CC'd due to our MAINTAINERS entry.
Fedora packages for sheepdog failed to build from upstream source
because of the more strict linker that no longer merges duplicate
global symbols. Fedora patches it to add the missing "extern"
annotations and presumably other distros do to, but upstream source
remains broken.
There is only basic compile testing, no functional testing of the
driver.
Since there are no build pre-requisites the sheepdog driver is currently
enabled unconditionally. This would result in configure issuing a
deprecation warning by default for all users. Thus the configure default
is changed to disable it, requiring users to pass --enable-sheepdog to
build the driver.
Reviewed-by: Markus Armbruster <armbru(a)redhat.com>
Reviewed-by: Thomas Huth <thuth(a)redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov(a)virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd(a)redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com>
---
block/sheepdog.c | 14 ++++++++++++++
configure | 5 +++--
docs/system/deprecated.rst | 9 +++++++++
3 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 2f5c0eb376..e270f2022c 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -242,6 +242,16 @@ typedef struct SheepdogInode {
*/
#define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
+static void deprecation_warning(void)
+{
+ static bool warned;
+
+ if (!warned) {
+ warn_report("the sheepdog block driver is deprecated");
+ warned = true;
+ }
+}
+
/*
* 64 bit Fowler/Noll/Vo FNV-1a hash code
*/
@@ -1548,6 +1558,8 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
char *buf = NULL;
QemuOpts *opts;
+ deprecation_warning();
+
s->bs = bs;
s->aio_context = bdrv_get_aio_context(bs);
@@ -2007,6 +2019,8 @@ static int sd_co_create(BlockdevCreateOptions *options, Error
**errp)
assert(options->driver == BLOCKDEV_DRIVER_SHEEPDOG);
+ deprecation_warning();
+
s = g_new0(BDRVSheepdogState, 1);
/* Steal SocketAddress from QAPI, set NULL to prevent double free */
diff --git a/configure b/configure
index ca9b458ea0..c5971fe560 100755
--- a/configure
+++ b/configure
@@ -533,7 +533,7 @@ vdi="yes"
vvfat="yes"
qed="yes"
parallels="yes"
-sheepdog="yes"
+sheepdog="no"
libxml2=""
debug_mutex="no"
libpmem=""
@@ -1940,7 +1940,7 @@ disabled with --disable-FEATURE, default is enabled if available:
vvfat vvfat image format support
qed qed image format support
parallels parallels image format support
- sheepdog sheepdog block driver support
+ sheepdog sheepdog block driver support (deprecated)
crypto-afalg Linux AF_ALG crypto backend driver
capstone capstone disassembler support
debug-mutex mutex debugging support
@@ -7200,6 +7200,7 @@ if test "$parallels" = "yes" ; then
echo "CONFIG_PARALLELS=y" >> $config_host_mak
fi
if test "$sheepdog" = "yes" ; then
+ add_to deprecated_features "sheepdog"
echo "CONFIG_SHEEPDOG=y" >> $config_host_mak
fi
if test "$pty_h" = "yes" ; then
diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
index da862201ba..fbc67b189b 100644
--- a/docs/system/deprecated.rst
+++ b/docs/system/deprecated.rst
@@ -376,6 +376,15 @@ The above, converted to the current supported format::
json:{"file.driver":"rbd", "file.pool":"rbd",
"file.image":"name"}
+``sheepdog`` driver (since 5.2.0)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The ``sheepdog`` block device driver is deprecated. The corresponding upstream
+server project is no longer actively maintained. Users are recommended to switch
+to an alternative distributed block device driver such as RBD. The
+``qemu-img convert`` command can be used to liberate existing data by moving
+it out of sheepdog volumes into an alternative storage backend.
+
linux-user mode CPUs
--------------------
--
2.26.2