OpenE2K/qemu-e2k
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fdfab37dfe
qemu-e2k/block
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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
backup.c
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
dmg-bz2.c
dmg.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
dmg.h
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
iscsi.c block: Add .bdrv_truncate() error messages 2017-04-28 16:02:03 +02:00
linux-aio.c
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.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
qcow2-cache.c
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
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-cluster.c
qed-gencb.c
qed-l2-cache.c
qed-table.c
qed.c block: Add .bdrv_truncate() error messages 2017-04-28 16:02:03 +02:00
qed.h
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
throttle-groups.c
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-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
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
write-threshold.c