[Libguestfs] [PATCH nbdkit v2 6/9] retry-request: Allow get_size operation to be retried

This plugin operation might need to do some real work (instead of just fetching a number from memory), and so it might have to be retried. In particular, changes to the curl plugin make .get_size into a heavyweight operation, where previously it was done as a side-effect of .open. And so we must allow .get_size to be retried independent of .open. --- filters/retry-request/retry-request.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/filters/retry-request/retry-request.c b/filters/retry-request/retry-request.c index e5b8344cd..8e3dd8246 100644 --- a/filters/retry-request/retry-request.c +++ b/filters/retry-request/retry-request.c @@ -141,6 +141,18 @@ retry_request_open (nbdkit_next_open *next, nbdkit_context *nxdata, return r == 0 ? NBDKIT_HANDLE_NOT_NEEDED : NULL; } +static int64_t +retry_request_get_size (nbdkit_next *next, void *handle) +{ + int64_t r; + int *err = &errno; /* used by the RETRY_* macros */ + + RETRY_START("get_size") + r = next->get_size (next); + RETRY_END; + return r; +} + static int retry_request_pread (nbdkit_next *next, void *handle, void *buf, uint32_t count, uint64_t offset, @@ -267,6 +279,7 @@ static struct nbdkit_filter filter = { .config = retry_request_config, .config_help = retry_request_config_help, .open = retry_request_open, + .get_size = retry_request_get_size, .pread = retry_request_pread, .pwrite = retry_request_pwrite, .trim = retry_request_trim, -- 2.41.0