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nbd patches for 2018-09-26

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Fixes for external clients; add reminder to revisit naming of x- command
 
 - Vladimir Sementsov-Ogievskiy: nbd/server: send more than one extent of base:allocation context
 - John Snow: qapi: bitmap-merge: document name change
 - Vladimir Sementsov-Ogievskiy: nbd/server: fix bitmap export
 -----BEGIN PGP SIGNATURE-----
 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg
 
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Merge remote-tracking branch 'remotes/ericb/tags/pull-nbd-2018-09-26' into staging

nbd patches for 2018-09-26

Fixes for external clients; add reminder to revisit naming of x- command

- Vladimir Sementsov-Ogievskiy: nbd/server: send more than one extent of base:allocation context
- John Snow: qapi: bitmap-merge: document name change
- Vladimir Sementsov-Ogievskiy: nbd/server: fix bitmap export

# gpg: Signature made Thu 27 Sep 2018 03:40:03 BST
# gpg:                using RSA key A7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>"
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>"
# gpg:                 aka "[jpeg image of size 6874]"
# Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 436A

* remotes/ericb/tags/pull-nbd-2018-09-26:
  nbd/server: send more than one extent of base:allocation context
  qapi: bitmap-merge: document name change
  nbd/server: fix bitmap export

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-10-01 09:21:22 +01:00
commit e7f5f0b6e6
2 changed files with 70 additions and 24 deletions
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92
nbd/server.c
View File

@ -1844,37 +1844,68 @@ static int coroutine_fn nbd_co_send_sparse_read(NBDClient *client,
return ret;
}
static int blockstatus_to_extent_be(BlockDriverState *bs, uint64_t offset,
uint64_t bytes, NBDExtent *extent)
/*
* Populate @extents from block status. Update @bytes to be the actual
* length encoded (which may be smaller than the original), and update
* @nb_extents to the number of extents used.
*
* Returns zero on success and -errno on bdrv_block_status_above failure.
*/
static int blockstatus_to_extents(BlockDriverState *bs, uint64_t offset,
uint64_t *bytes, NBDExtent *extents,
unsigned int *nb_extents)
{
uint64_t remaining_bytes = bytes;
uint64_t remaining_bytes = *bytes;
NBDExtent *extent = extents, *extents_end = extents + *nb_extents;
bool first_extent = true;
assert(*nb_extents);
while (remaining_bytes) {
uint32_t flags;
int64_t num;
int ret = bdrv_block_status_above(bs, NULL, offset, remaining_bytes,
&num, NULL, NULL);
if (ret < 0) {
return ret;
}
flags = (ret & BDRV_BLOCK_ALLOCATED ? 0 : NBD_STATE_HOLE) |
(ret & BDRV_BLOCK_ZERO ? NBD_STATE_ZERO : 0);
if (remaining_bytes == bytes) {
extent->flags = flags;
}
if (flags != extent->flags) {
break;
}
offset += num;
remaining_bytes -= num;
if (first_extent) {
extent->flags = flags;
extent->length = num;
first_extent = false;
continue;
}
if (flags == extent->flags) {
/* extend current extent */
extent->length += num;
} else {
if (extent + 1 == extents_end) {
break;
}
/* start new extent */
extent++;
extent->flags = flags;
extent->length = num;
}
}
cpu_to_be32s(&extent->flags);
extent->length = cpu_to_be32(bytes - remaining_bytes);
extents_end = extent + 1;
for (extent = extents; extent < extents_end; extent++) {
cpu_to_be32s(&extent->flags);
cpu_to_be32s(&extent->length);
}
*bytes -= remaining_bytes;
*nb_extents = extents_end - extents;
return 0;
}
@ -1910,21 +1941,29 @@ static int nbd_co_send_extents(NBDClient *client, uint64_t handle,
/* Get block status from the exported device and send it to the client */
static int nbd_co_send_block_status(NBDClient *client, uint64_t handle,
BlockDriverState *bs, uint64_t offset,
uint32_t length, bool last,
uint32_t context_id, Error **errp)
uint32_t length, bool dont_fragment,
bool last, uint32_t context_id,
Error **errp)
{
int ret;
NBDExtent extent;
unsigned int nb_extents = dont_fragment ? 1 : NBD_MAX_BITMAP_EXTENTS;
NBDExtent *extents = g_new(NBDExtent, nb_extents);
uint64_t final_length = length;
ret = blockstatus_to_extent_be(bs, offset, length, &extent);
ret = blockstatus_to_extents(bs, offset, &final_length, extents,
&nb_extents);
if (ret < 0) {
g_free(extents);
return nbd_co_send_structured_error(
client, handle, -ret, "can't get block status", errp);
}
return nbd_co_send_extents(client, handle, &extent, 1,
be32_to_cpu(extent.length), last,
context_id, errp);
ret = nbd_co_send_extents(client, handle, extents, nb_extents,
final_length, last, context_id, errp);
g_free(extents);
return ret;
}
/*
@ -1951,6 +1990,8 @@ static unsigned int bitmap_to_extents(BdrvDirtyBitmap *bitmap, uint64_t offset,
assert(begin < overall_end && nb_extents);
while (begin < overall_end && i < nb_extents) {
bool next_dirty = !dirty;
if (dirty) {
end = bdrv_dirty_bitmap_next_zero(bitmap, begin);
} else {
@ -1962,6 +2003,7 @@ static unsigned int bitmap_to_extents(BdrvDirtyBitmap *bitmap, uint64_t offset,
end = MIN(bdrv_dirty_bitmap_size(bitmap),
begin + UINT32_MAX + 1 -
bdrv_dirty_bitmap_granularity(bitmap));
next_dirty = dirty;
}
if (dont_fragment && end > overall_end) {
end = overall_end;
@ -1971,7 +2013,7 @@ static unsigned int bitmap_to_extents(BdrvDirtyBitmap *bitmap, uint64_t offset,
extents[i].flags = cpu_to_be32(dirty ? NBD_STATE_DIRTY : 0);
i++;
begin = end;
dirty = !dirty;
dirty = next_dirty;
}
bdrv_dirty_iter_free(it);
@ -2228,10 +2270,12 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
(client->export_meta.base_allocation ||
client->export_meta.bitmap))
{
bool dont_fragment = request->flags & NBD_CMD_FLAG_REQ_ONE;
if (client->export_meta.base_allocation) {
ret = nbd_co_send_block_status(client, request->handle,
blk_bs(exp->blk), request->from,
request->len,
request->len, dont_fragment,
!client->export_meta.bitmap,
NBD_META_ID_BASE_ALLOCATION,
errp);
@ -2244,7 +2288,7 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
ret = nbd_co_send_bitmap(client, request->handle,
client->exp->export_bitmap,
request->from, request->len,
request->flags & NBD_CMD_FLAG_REQ_ONE,
dont_fragment,
true, NBD_META_ID_DIRTY_BITMAP, errp);
if (ret < 0) {
return ret;

2
qapi/block-core.json
View File

@ -1935,6 +1935,8 @@
##
# @x-block-dirty-bitmap-merge:
#
# FIXME: Rename @src_name and @dst_name to src-name and dst-name.
#
# Merge @src_name dirty bitmap to @dst_name dirty bitmap. @src_name dirty
# bitmap is unchanged. On error, @dst_name is unchanged.
#