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fd630039c0
qemu/block
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Alberto Garcia fd630039c0 qcow2: Update qcow2_get_cluster_offset() to support L2 slices 
qcow2_get_cluster_offset() checks how many contiguous bytes are
available at a given offset. The returned number of bytes is limited
by the amount that can be addressed without having to load more than
one L2 table.

Since we'll be loading L2 slices instead of full tables this patch
changes the limit accordingly using the size of the L2 slice for the
calculations instead of the full table size.

One consequence of this is that with small L2 slices operations such
as 'qemu-img map' will need to iterate in more steps because each
qcow2_get_cluster_offset() call will potentially return a smaller
number. However the code is already prepared for that so this doesn't
break semantics.

The l2_table variable is also renamed to l2_slice to reflect this, and
offset_to_l2_index() is replaced with offset_to_l2_slice_index().

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 6b602260acb33da56ed6af9611731cb7acd110eb.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
2018-02-13 16:59:59 +01:00
..
accounting.c block: make accounting thread-safe 2017-06-16 07:55:00 +08:00
backup.c backup: use copy_bitmap in incremental backup 2017-12-18 10:54:13 -05:00
blkdebug.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
blkreplay.c block: change variable names in BlockDriverState 2017-06-26 14:54:46 +02:00
blkverify.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
block-backend.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
bochs.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
cloop.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
commit.c commit: Simplify reopen of base 2017-12-22 15:05:32 +01:00
crypto.c block: Simplify bdrv_can_write_zeroes_with_unmap() 2018-02-09 12:32:44 -06:00
crypto.h qcow: convert QCow to use QCryptoBlock for encryption 2017-07-11 17:44:56 +02:00
curl.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
dirty-bitmap.c block: maintain persistent disabled bitmaps 2018-02-13 16:59:58 +01:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
dmg.h block: remove "qemu/osdep.h" from header file 2017-12-18 17:07:02 +03:00
file-posix.c block: Simplify bdrv_can_write_zeroes_with_unmap() 2018-02-09 12:32:44 -06:00
file-win32.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
gluster.c gluster: Add preallocated truncation 2018-02-13 16:18:35 +01:00
io.c block: Introduce buf register API 2018-02-08 09:22:03 +08:00
iscsi-opts.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
iscsi.c block: Simplify bdrv_can_write_zeroes_with_unmap() 2018-02-09 12:32:44 -06:00
linux-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
Makefile.objs block: Add VFIO based NVMe driver 2018-02-08 09:22:03 +08:00
mirror.c blockjob: remove clock argument from block_job_sleep_ns 2017-11-29 15:11:02 +01:00
nbd-client.c nbd: Don't crash when server reports NBD_CMD_READ failure 2017-11-17 08:02:45 -06:00
nbd-client.h nbd: Minimal structured read for client 2017-10-30 21:48:41 +01:00
nbd.c block: Simplify bdrv_can_write_zeroes_with_unmap() 2018-02-09 12:32:44 -06:00
nfs.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
null.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
nvme.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
parallels.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
parallels.h Clean up includes 2018-02-09 05:05:11 +01:00
qapi.c Include qapi/qmp/qdict.h exactly where needed 2018-02-09 13:52:15 +01:00
qcow2-bitmap.c block: maintain persistent disabled bitmaps 2018-02-13 16:59:58 +01:00
qcow2-cache.c qcow2: Remove BDS parameter from qcow2_cache_is_table_offset() 2018-02-13 16:59:59 +01:00
qcow2-cluster.c qcow2: Update qcow2_get_cluster_offset() to support L2 slices 2018-02-13 16:59:59 +01:00
qcow2-refcount.c qcow2: Remove BDS parameter from qcow2_cache_is_table_offset() 2018-02-13 16:59:59 +01:00
qcow2-snapshot.c qcow2: Discard/zero clusters by byte count 2017-05-11 14:28:07 +02:00
qcow2.c qcow2: Add l2_slice_size field to BDRVQcow2State 2018-02-13 16:59:59 +01:00
qcow2.h qcow2: Add offset_to_l2_slice_index() 2018-02-13 16:59:59 +01:00
qcow.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
qed-check.c qed: Use DIV_ROUND_UP 2016-06-07 18:19:24 +03:00
qed-cluster.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-l2-cache.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-table.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed.c block: Simplify bdrv_can_write_zeroes_with_unmap() 2018-02-09 12:32:44 -06:00
qed.h qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
quorum.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
raw-format.c block: remove unused bdrv_media_changed 2017-09-04 18:31:13 +02:00
rbd.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
replication.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
sheepdog.c sheepdog: Allow fully preallocated truncation 2018-02-13 16:18:41 +01:00
snapshot.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
ssh.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
stream.c blockjob: remove clock argument from block_job_sleep_ns 2017-11-29 15:11:02 +01:00
throttle-groups.c throttle-groups: forget timer and schedule next TGM on detach 2017-11-16 14:12:57 +00:00
throttle.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
trace-events block: Add VFIO based NVMe driver 2018-02-08 09:22:03 +08:00
vdi.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
vhdx-endian.c vhdx: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx-log.c vhdx: use QEMU_ALIGN_DOWN 2017-08-31 12:29:07 +02:00
vhdx.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
vhdx.h block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec 2014-12-12 15:42:22 +00:00
vmdk.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
vpc.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
vvfat.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
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 Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00