search for: nbdplug_open

Another series on top of my exportname filter, marking off another todo bullet point. With this, you can now use the NBD plugin as a transparent passthrough of all export names served by the remote server in both directions (list advertisement server to client, and export name from client to server). Eric Blake (3): nbd: Implement .default_export, .export_description nbd: Add

...Fixes: ab7760fc Signed-off-by: Eric Blake <eblake@redhat.com> --- plugins/nbd/nbd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/plugins/nbd/nbd.c b/plugins/nbd/nbd.c index ba1e7188..0ea2a4a2 100644 --- a/plugins/nbd/nbd.c +++ b/plugins/nbd/nbd.c @@ -532,7 +532,7 @@ nbdplug_open (int readonly) static void nbdplug_close_handle (struct handle *h) { - if (nbd_shutdown (h->nbd, 0) == -1) + if (nbd_aio_disconnect (h->nbd, 0) == -1) nbdkit_debug ("failed to clean up handle: %s", nbd_get_error ()); if ((errno = pthread_join (h->reader, NULL)))...

...void) } nbd_close (nbd); } + return 0; +} - /* Create the shared connection. */ +/* Create the shared connection. Because this may create a background + * thread it must be done after we fork. + */ +static int +nbdplug_after_fork (void) +{ if (shared && (shared_handle = nbdplug_open_handle (false)) == NULL) return -1; return 0; @@ -858,6 +865,7 @@ static struct nbdkit_plugin plugin = { .config_complete = nbdplug_config_complete, .config_help = nbdplug_config_help, .magic_config_key = "uri", + .after_fork = nbdplug_after_fork,...

...t cookie) } nbdkit_debug ("cookie %" PRId64 " started by state machine", cookie); + trans->cookie = cookie; if (write (h->fds[1], &c, 1) != 1 && errno != EAGAIN) nbdkit_debug ("failed to kick reader thread: %m"); @@ -504,7 +510,7 @@ nbdplug_open (int readonly) static void nbdplug_close_handle (struct handle *h) { - if (nbd_shutdown (h->nbd) == -1) + if (nbd_shutdown (h->nbd, 0) == -1) nbdkit_debug ("failed to clean up handle: %s", nbd_get_error ()); if ((errno = pthread_join (h->reader, NULL))) nbdkit_d...

...tf ("libnbd_uri=%d\n", nbd_supports_uri (nbd)); printf ("libnbd_vsock=%d\n", USE_VSOCK); +#if LIBNBD_HAVE_NBD_OPT_LIST + printf ("libnbd_dynamic_list=1\n"); +#else + printf ("libnbd_dynamic_list=0\n"); +#endif nbd_close (nbd); } @@ -685,6 +690,53 @@ nbdplug_open_handle (int readonly, const char *client_export) return NULL; } +#if LIBNBD_HAVE_NBD_OPT_LIST +static int +collect_one (void *opaque, const char *name, const char *desc) +{ + struct nbdkit_exports *exports = opaque; + + if (nbdkit_add_export (exports, name, desc) == -1) + nbdkit_debug (&q...

I fixed the deadlock - turned out to be an actual bug in the nbd plugin (see patch 8). I changed the command syntax so it's now: nbdkit nbd command=qemu arg=-f arg=qcow2 arg=/path/to/disk.qcow2 Nir wrote: 18:08 < nsoffer> rwmjones: regarding the nbd proxy patches, did you have specific flow that help us? 18:08 < nsoffer> rwmjones: or this is just a way to support qcow2 in the

Patch 1 played with an early draft of Rich's Fedora 30 libnbd package: https://bugzilla.redhat.com/show_bug.cgi?id=1713767#c17 Note that comment 21 provides a newer package 0.1.1-1 with a different API; and that libnbd has more unreleased API changes in the pipeline (whether that will be called 0.2 or 0.1.2); so we'll have to tweak things based on what is actually available in distros.

libnbd-0.1.2-1 is now available in Fedora 29/30 updates-testing, although it was not compiled against libxml2 so it lacks uri support (I ended up testing patch 4 with a self-built libnbd). Diffs since v1 - rebase to master, bump from libnbd 0.1 to 0.1.2, add URI support, better timing results Still not done - patch 5 needs associated tests Eric Blake (5): nbd: Check for libnbd nbd:

libnbd-0.1.4-1 is now available in Fedora 29/30 updates testing. Diffs since v2 - rebase to master, bump from libnbd 0.1.2 to 0.1.3+, add tests to TLS usage which flushed out the need to turn relative pathnames into absolute, doc tweaks Now that the testsuite covers TLS and libnbd has been fixed to provide the things I found lacking when developing v2, I'm leaning towards pushing this on

...f (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &optval, - sizeof (int)) == -1) { - nbdkit_error ("cannot set TCP_NODELAY option: %m"); - close (fd); - return -1; - } - return fd; -} - /* Create the shared or per-connection handle. */ static struct handle * nbdplug_open_handle (int readonly) { struct handle *h; - struct old_handshake old; - uint64_t version; + int r; h = calloc (1, sizeof *h); if (h == NULL) { nbdkit_error ("malloc: %m"); return NULL; } + if (pipe (h->fds)) { + nbdkit_error ("pipe: %m"); + f...

...f (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &optval, - sizeof (int)) == -1) { - nbdkit_error ("cannot set TCP_NODELAY option: %m"); - close (fd); - return -1; - } - return fd; -} - /* Create the shared or per-connection handle. */ static struct handle * nbdplug_open_handle (int readonly) { struct handle *h; - struct old_handshake old; - uint64_t version; + int r; h = calloc (1, sizeof *h); if (h == NULL) { nbdkit_error ("malloc: %m"); return NULL; } + if (pipe (h->fds)) { + nbdkit_error ("pipe: %m"); + f...

It's been several weeks since I posted v2 (I got distracted by improving libnbd to better test things, which in turn surfaced some major memory leak problems in nbdsh that are now fixed). Many of the patches are minor rebases from v2, with the biggest changes being fallout from: - patch 2: rename nbdkit_add_default_export to nbdkit_use_default_export - overall: this missed 1.22, so update