[Libguestfs] [PATCH nbdkit v4 10/15] partition: Implement mapping of extents.

--- filters/partition/partition.c | 36 +++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/filters/partition/partition.c b/filters/partition/partition.c index c1fe7a1..853d734 100644 --- a/filters/partition/partition.c +++ b/filters/partition/partition.c @@ -38,6 +38,7 @@ #include <stdint.h> #include <string.h> #include <inttypes.h> +#include <assert.h> #include <nbdkit-filter.h> @@ -222,6 +223,40 @@ partition_zero (struct nbdkit_next_ops *next_ops, void *nxdata, return next_ops->zero (nxdata, count, offs + h->offset, flags, err); } +/* Extents. */ +static int +partition_extents (struct nbdkit_next_ops *next_ops, void *nxdata, + void *handle, uint32_t count, uint64_t offs, uint32_t flags, + struct nbdkit_extents *extents, int *err) +{ + struct handle *h = handle; + size_t i; + struct nbdkit_extents *extents2; + struct nbdkit_extent e; + + extents2 = nbdkit_extents_new (offs + h->offset); + if (extents2 == NULL) { + *err = errno; + return -1; + } + if (next_ops->extents (nxdata, count, offs + h->offset, + flags, extents2, err) == -1) + goto error; + + for (i = 0; i < nbdkit_extents_count (extents2); ++i) { + e = nbdkit_get_extent (extents2, i); + e.offset -= h->offset; + if (nbdkit_add_extent (extents, e.offset, e.length, e.type) == -1) + goto error; + } + nbdkit_extents_free (extents2); + return 0; + + error: + nbdkit_extents_free (extents2); + return -1; +} + static struct nbdkit_filter filter = { .name = "partition", .longname = "nbdkit partition filter", @@ -237,6 +272,7 @@ static struct nbdkit_filter filter = { .pwrite = partition_pwrite, .trim = partition_trim, .zero = partition_zero, + .extents = partition_extents, }; NBDKIT_REGISTER_FILTER(filter) -- 2.20.1