From: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
To: qemu-block@nongnu.org
Cc: kwolf@redhat.com, vsementsov@virtuozzo.com,
qemu-devel@nongnu.org, mreitz@redhat.com,
andrey.shinkevich@virtuozzo.com, den@openvz.org
Subject: [PATCH v9 05/10] qcow2_format.py: Dump bitmap directory information
Date: Mon, 13 Jul 2020 10:27:51 +0300 [thread overview]
Message-ID: <1594625276-134500-6-git-send-email-andrey.shinkevich@virtuozzo.com> (raw)
In-Reply-To: <1594625276-134500-1-git-send-email-andrey.shinkevich@virtuozzo.com>
Read and dump entries from the bitmap directory of QCOW2 image.
It extends the output in the test case #291.
Header extension:
magic 0x23852875 (Bitmaps)
...
Bitmap name bitmap-1
bitmap_table_offset 0xf0000
bitmap_table_size 1
flags 0x2 (['auto'])
type 1
granularity_bits 16
name_size 8
extra_data_size 0
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
---
tests/qemu-iotests/291.out | 45 ++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/qcow2_format.py | 47 ++++++++++++++++++++++++++++++++++++++
2 files changed, 92 insertions(+)
diff --git a/tests/qemu-iotests/291.out b/tests/qemu-iotests/291.out
index 08bfaaa..53a8eeb 100644
--- a/tests/qemu-iotests/291.out
+++ b/tests/qemu-iotests/291.out
@@ -33,6 +33,24 @@ reserved32 0
bitmap_directory_size 0x40
bitmap_directory_offset 0x510000
+Bitmap name b1
+bitmap_table_offset 0x4e0000
+bitmap_table_size 1
+flags 0x0 ([])
+type 1
+granularity_bits 19
+name_size 2
+extra_data_size 0
+
+Bitmap name b2
+bitmap_table_offset 0x500000
+bitmap_table_size 1
+flags 0x2 (['auto'])
+type 1
+granularity_bits 16
+name_size 2
+extra_data_size 0
+
=== Bitmap preservation not possible to non-qcow2 ===
@@ -98,6 +116,33 @@ reserved32 0
bitmap_directory_size 0x60
bitmap_directory_offset 0x520000
+Bitmap name b1
+bitmap_table_offset 0x470000
+bitmap_table_size 1
+flags 0x0 ([])
+type 1
+granularity_bits 19
+name_size 2
+extra_data_size 0
+
+Bitmap name b2
+bitmap_table_offset 0x490000
+bitmap_table_size 1
+flags 0x2 (['auto'])
+type 1
+granularity_bits 16
+name_size 2
+extra_data_size 0
+
+Bitmap name b0
+bitmap_table_offset 0x510000
+bitmap_table_size 1
+flags 0x0 ([])
+type 1
+granularity_bits 16
+name_size 2
+extra_data_size 0
+
=== Check bitmap contents ===
diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_format.py
index 934062a..1438792 100644
--- a/tests/qemu-iotests/qcow2_format.py
+++ b/tests/qemu-iotests/qcow2_format.py
@@ -129,6 +129,53 @@ class Qcow2BitmapExt(Qcow2Struct):
('u64', '{:#x}', 'bitmap_directory_offset')
)
+ def __init__(self, fd):
+ super().__init__(fd=fd)
+ self.read_bitmap_directory(fd)
+
+ def read_bitmap_directory(self, fd):
+ fd.seek(self.bitmap_directory_offset)
+ self.bitmap_directory = \
+ [Qcow2BitmapDirEntry(fd) for _ in range(self.nb_bitmaps)]
+
+ def dump(self):
+ super().dump()
+ for entry in self.bitmap_directory:
+ print()
+ entry.dump()
+
+
+class Qcow2BitmapDirEntry(Qcow2Struct):
+
+ fields = (
+ ('u64', '{:#x}', 'bitmap_table_offset'),
+ ('u32', '{}', 'bitmap_table_size'),
+ ('u32', BitmapFlags, 'flags'),
+ ('u8', '{}', 'type'),
+ ('u8', '{}', 'granularity_bits'),
+ ('u16', '{}', 'name_size'),
+ ('u32', '{}', 'extra_data_size')
+ )
+
+ def __init__(self, fd):
+ super().__init__(fd=fd)
+ # Seek relative to the current position in the file
+ fd.seek(self.extra_data_size, 1)
+ bitmap_name = fd.read(self.name_size)
+ self.name = bitmap_name.decode('ascii')
+ # Move position to the end of the entry in the directory
+ entry_raw_size = self.bitmap_dir_entry_raw_size()
+ padding = ((entry_raw_size + 7) & ~7) - entry_raw_size
+ fd.seek(padding, 1)
+
+ def bitmap_dir_entry_raw_size(self):
+ return struct.calcsize(self.fmt) + self.name_size + \
+ self.extra_data_size
+
+ def dump(self):
+ print(f'{"Bitmap name":<25} {self.name}')
+ super(Qcow2BitmapDirEntry, self).dump()
+
QCOW2_EXT_MAGIC_BITMAPS = 0x23852875
--
1.8.3.1
next prev parent reply other threads:[~2020-07-13 7:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-13 7:27 [PATCH v9 00/10] iotests: Dump QCOW2 dirty bitmaps metadata Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 01/10] qcow2: Fix capitalization of header extension constant Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 02/10] qcow2_format.py: make printable data an extension class member Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 03/10] qcow2_format.py: change Qcow2BitmapExt initialization method Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 04/10] qcow2_format.py: dump bitmap flags in human readable way Andrey Shinkevich
2020-07-13 7:27 ` Andrey Shinkevich [this message]
2020-07-13 7:27 ` [PATCH v9 06/10] qcow2_format.py: pass cluster size to substructures Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 07/10] qcow2_format.py: Dump bitmap table serialized entries Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 08/10] qcow2.py: Introduce '-j' key to dump in JSON format Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 09/10] qcow2_format.py: collect fields " Andrey Shinkevich
2020-07-13 7:27 ` [PATCH v9 10/10] qcow2_format.py: support dumping metadata " Andrey Shinkevich
2020-07-13 12:41 ` [PATCH v9 00/10] iotests: Dump QCOW2 dirty bitmaps metadata Eric Blake
2020-07-13 12:52 ` Andrey Shinkevich
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1594625276-134500-6-git-send-email-andrey.shinkevich@virtuozzo.com \
--to=andrey.shinkevich@virtuozzo.com \
--cc=den@openvz.org \
--cc=kwolf@redhat.com \
--cc=mreitz@redhat.com \
--cc=qemu-block@nongnu.org \
--cc=qemu-devel@nongnu.org \
--cc=vsementsov@virtuozzo.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.