search for: offset_config_complet

The man page claims both offset and range are optional (matching the code), but the --help text claims offset is mandatory, and the comment to the no-op offset_config_complete claims we require both parameters. We did not check for an offset larger than the underlying size when there was no range, and even when there is a range, we were not careful about integer overflow (offset=5E range=5E happily claims to export a 5E image; but all bets are off if you later try to ac...

...return -1; + return 0; + } + else if (strcmp (key, "range") == 0) { + range = nbdkit_parse_size (value); + if (range == -1) + return -1; + return 0; + } + else + return next (nxdata, key, value); +} + +/* Check the user did pass both parameters. */ +static int +offset_config_complete (nbdkit_next_config_complete *next, void *nxdata) +{ + if (offset == -1) { + nbdkit_error ("you must supply the offset parameter on the command line"); + return -1; + } + + return next (nxdata); +} + +#define offset_config_help \ + "offset=<OFFSET> (required) The...

...1)>, L<nbdkit-file-plugin(1)>, L<nbdkit-filter(3)>. +L<nbdkit-partition-filter(1)>. =head1 AUTHORS diff --git a/filters/offset/offset.c b/filters/offset/offset.c index cd0c89b..892d5ec 100644 --- a/filters/offset/offset.c +++ b/filters/offset/offset.c @@ -81,10 +81,10 @@ offset_config_complete (nbdkit_next_config_complete *next, void *nxdata) /* Get the file size. */ static int64_t -offset_get_size (struct nbdkit_next *next, void *nxdata, +offset_get_size (struct nbdkit_next_ops *next_ops, void *nxdata, void *handle) { - int64_t real_size = next->get_size (nxd...

Rebased filters patch. Requires current git master + the locks / thread model fix (https://www.redhat.com/archives/libguestfs/2018-January/msg00128.html) So a few changes here since last time: The "introduce filters" and "implement filters" patches are squashed together. I introduced a concept of .prepare and .finalize. These run before and after the data serving phase

This patch isn't complete (patch 6/6 isn't finished) so it's just for discussion, although it does compile and run. This introduces to nbdkit a concept of "filters" which can be placed in front of plugins to modify their behaviour. Some examples where you might use filters: * Serve a subset of the data, such as (offset, range) or a single partition from a disk image.

This is still tentative and needs a lot of work, but: - partition filter works, supporting MBR & GPT - prepare and finalize methods fixed - open method can now be changed (allowing readonly flag to be modified) - thread_model can be limited I believe I made most of the changes which were previously suggested in email. I think the only one I didn't was preventing inclusion of both

The first three patches are identical to: https://www.redhat.com/archives/libguestfs/2018-January/msg00079.html "[PATCH nbdkit v2 0/3] Refactor plugin_* functions into a backend" The rest of the patches add filters using the new filter API previously described here: https://www.redhat.com/archives/libguestfs/2018-January/msg00073.html This needs a lot more testing -- and tests --

A combination of the work that both Rich and I have been doing lately, where filters use only the new API with flags on every command that the client can send over the wire (we can then add support for more flags in nbdkit without having to add new callbacks, as NBD adds more flags upstream). Eric Blake (4): protocol: Split flags from cmd field in requests backend: Pass flags argument through