OpenE2K/qemu-e2k
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fdfab37dfe
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Eric Blake fdfab37dfe qcow2: Make distinction between zero cluster types obvious 
Treat plain zero clusters differently from allocated ones, so that
we can simplify the logic of checking whether an offset is present.
Do this by splitting QCOW2_CLUSTER_ZERO into two new enums,
QCOW2_CLUSTER_ZERO_PLAIN and QCOW2_CLUSTER_ZERO_ALLOC.

I tried to arrange the enum so that we could use
'ret <= QCOW2_CLUSTER_ZERO_PLAIN' for all unallocated types, and
'ret >= QCOW2_CLUSTER_ZERO_ALLOC' for allocated types, although
I didn't actually end up taking advantage of the layout.

In many cases, this leads to simpler code, by properly combining
cases (sometimes, both zero types pair together, other times,
plain zero is more like unallocated while allocated zero is more
like normal).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-id: 20170507000552.20847-7-eblake@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-05-11 14:28:07 +02:00
..
accounting.c block: Clean up includes 2016-01-20 13:36:23 +01:00
backup.c backup: React to bdrv_is_allocated() errors 2017-03-13 12:49:33 +01:00
blkdebug.c blkdebug: Add ability to override unmap geometries 2017-05-11 14:28:06 +02:00
blkreplay.c block: Do not unref bs->file on error in BD's open 2017-04-27 16:12:13 +02:00
blkverify.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
block-backend.c block: Drop permissions when migration completes 2017-05-11 12:08:24 +02:00
bochs.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
cloop.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
commit.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
crypto.c block: Add errp to BD.bdrv_truncate() 2017-04-28 16:02:03 +02:00
curl.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
dirty-bitmap.c block: More operations for meta dirty bitmap 2016-10-24 17:56:07 +02:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
dmg.h dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
file-posix.c file-posix: Remove .bdrv_inactivate/invalidate_cache 2017-05-11 12:08:24 +02:00
file-win32.c file-win32: Error out if locking=on 2017-05-11 11:08:41 +02:00
gluster.c sockets: Rename SocketAddressFlat to SocketAddress 2017-05-09 09:14:40 +02:00
io.c block: fix alignment calculations in bdrv_co_do_zero_pwritev 2017-04-27 16:24:01 +02:00
iscsi-opts.c block/iscsi: statically link qemu_iscsi_opts 2017-01-27 18:07:58 +01:00
iscsi.c block: Add .bdrv_truncate() error messages 2017-04-28 16:02:03 +02:00
linux-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
Makefile.objs block/vxhs.c: Add support for a new block device type called "vxhs" 2017-04-24 15:08:42 -04:00
mirror.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
nbd-client.c nbd-client: fix handling of hungup connections 2017-03-27 16:50:36 +02:00
nbd-client.h nbd: drop unused NBDClientSession.is_unix field 2017-03-27 14:41:01 +02:00
nbd.c sockets: Limit SocketAddressLegacy to external interfaces 2017-05-09 09:14:40 +02:00
nfs.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
null.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
parallels.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
qapi.c block: Don't bother asserting type of output visitor's output 2017-02-22 19:52:20 +01:00
qcow2-cache.c qcow2: Remove stale comment 2016-11-25 13:51:30 +01:00
qcow2-cluster.c qcow2: Make distinction between zero cluster types obvious 2017-05-11 14:28:07 +02:00
qcow2-refcount.c qcow2: Make distinction between zero cluster types obvious 2017-05-11 14:28:07 +02:00
qcow2-snapshot.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +02:00
qcow2.c qcow2: Make distinction between zero cluster types obvious 2017-05-11 14:28:07 +02:00
qcow2.h qcow2: Make distinction between zero cluster types obvious 2017-05-11 14:28:07 +02:00
qcow.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
qed-check.c qed: Use DIV_ROUND_UP 2016-06-07 18:19:24 +03:00
qed-cluster.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
qed-gencb.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-l2-cache.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-table.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
qed.c block: Add .bdrv_truncate() error messages 2017-04-28 16:02:03 +02:00
qed.h block: explicitly acquire aiocontext in timers that need it 2017-02-21 11:14:08 +00:00
quorum.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
raw-format.c block: Add .bdrv_truncate() error messages 2017-04-28 16:02:03 +02:00
rbd.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
replication.c block: Make errp the last parameter of commit_active_start 2017-04-24 09:13:44 +02:00
sheepdog.c sockets: Limit SocketAddressLegacy to external interfaces 2017-05-09 09:14:40 +02:00
snapshot.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
ssh.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
stream.c block: Add Error parameter to bdrv_set_backing_hd() 2017-02-28 20:47:51 +01:00
throttle-groups.c coroutine-lock: add mutex argument to CoQueue APIs 2017-02-21 11:39:40 +00:00
trace-events block/vxhs.c: Add support for a new block device type called "vxhs" 2017-04-24 15:08:42 -04:00
vdi.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
vhdx-endian.c vhdx: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx-log.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
vhdx.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
vhdx.h block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec 2014-12-12 15:42:22 +00:00
vmdk.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
vpc.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
vvfat.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
vxhs.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
win32-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
write-threshold.c block: use bdrv_add_before_write_notifier 2016-10-07 13:34:07 +02:00