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...the C<.thread_model> if present, any restrictions +requested by filters, and any platform-specific limitations implied if +C<.fork_safe> is not set. The possible settings for C<THREAD_MODEL> are defined below. diff --git a/include/nbdkit-plugin.h b/include/nbdkit-plugin.h index 632df867..75e08651 100644 --- a/include/nbdkit-plugin.h +++ b/include/nbdkit-plugin.h @@ -132,6 +132,7 @@ struct nbdkit_plugin { int (*cache) (void *handle, uint32_t count, uint64_t offset, uint32_t flags); int (*thread_model) (void); + int fork_safe; }; extern void nbdkit_set_error (int err); di...

...err = EOPNOTSUPP; + return -1; + } r = p->plugin._zero_old (connection_get_handle (conn, 0), count, offset, may_trim); + } else emulate = true; if (r == -1) diff --git a/include/nbdkit-plugin.h b/include/nbdkit-plugin.h index 632df867..45ae7053 100644 --- a/include/nbdkit-plugin.h +++ b/include/nbdkit-plugin.h @@ -132,6 +132,8 @@ struct nbdkit_plugin { int (*cache) (void *handle, uint32_t count, uint64_t offset, uint32_t flags); int (*thread_model) (void); + + int (*can_fast_zero) (void *handle); }; extern void nbdkit...

This is a major rewrite compared to my v1 series, where I've tried a lot harder to ensure that we still accommodate building on Haiku (although I have not actually yet fired up a Haiku VM to try it for myself). I also managed to make the sh plugin fully parallel, on capable platforms. See also my question on patch 10 on whether I've picked the best naming convention. Eric Blake (17):

This is a cover letter to a series of patches being proposed in tandem to four different projects: - nbd: Document a new NBD_CMD_FLAG_FAST_ZERO command flag - qemu: Implement the flag for both clients and server - libnbd: Implement the flag for clients - nbdkit: Implement the flag for servers, including the nbd passthrough client If you want to test the patches together, I've pushed a