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#!/usr/bin/python3
#
# Copyright (C) 2018 Hans van Kranenburg <hans@knorrie.org>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import argparse
import btrfs
import sys
class WastedSpaceError(Exception):
pass
class FakeDevItem(object):
def __init__(self, devid, total_bytes):
self.devid = devid
self.total_bytes = total_bytes
self.bytes_used = 0
class FakeFileSystem(object):
def __init__(self, device_sizes, mixed_groups, metadata_profile, data_profile):
self._mixed_groups = mixed_groups
self._devices = [FakeDevItem(devid+1, size)
for devid, size in enumerate(device_sizes)]
def mixed_groups(self):
return self._mixed_groups
def space_info(self):
return []
def devices(self):
return self._devices
def chunks(self):
return []
def parse_args():
parser = argparse.ArgumentParser(description="Calculate usable and unallocatable disk space")
parser.add_argument(
'-m', '--metadata',
required=True,
action='store',
help="metadata profile, values like for data profile",
)
parser.add_argument(
'-d', '--data',
required=True,
action='store',
help="data profile, raid0, raid1, raid5, raid6, raid10, dup or single",
)
parser.add_argument(
'-M', '--mixed',
action='store_true',
help="use mixed block groups (data and metadata profile must match)",
)
parser.add_argument(
'-r', '--ratio',
action='store',
type=int,
help="data to metadata ratio for non-mixed filesystem, e.g. 200 (the default), "
"which means allocate 0.5%% for metadata",
)
parser.add_argument(
'size',
nargs='+',
help="disk sizes, e.g. 2TB 500G 1TiB",
)
return parser.parse_args()
_str_to_profile_map = {
'raid0': btrfs.BLOCK_GROUP_RAID0,
'raid1': btrfs.BLOCK_GROUP_RAID1,
'raid1c3': btrfs.BLOCK_GROUP_RAID1C3,
'raid1c4': btrfs.BLOCK_GROUP_RAID1C4,
'raid5': btrfs.BLOCK_GROUP_RAID5,
'raid6': btrfs.BLOCK_GROUP_RAID6,
'raid10': btrfs.BLOCK_GROUP_RAID10,
'single': 0,
'dup': btrfs.BLOCK_GROUP_DUP,
}
def main():
args = parse_args()
device_sizes = []
for size in args.size:
try:
device_sizes.append(btrfs.utils.parse_pretty_size(size))
except ValueError as e:
raise WastedSpaceError("Invalid device size {}".format(size))
mixed_groups = args.mixed
try:
metadata_profile = _str_to_profile_map[args.metadata]
except KeyError as e:
raise WastedSpaceError("Unknown profile {}".format(args.metadata))
try:
data_profile = _str_to_profile_map[args.data]
except KeyError as e:
raise WastedSpaceError("Unknown profile {}".format(args.data))
if mixed_groups and metadata_profile != data_profile:
raise WastedSpaceError(
"When using mixed groups, metadata and data profile need to be identical.")
fs = FakeFileSystem(device_sizes, mixed_groups, metadata_profile, data_profile)
if not mixed_groups:
usage = btrfs.fs_usage.FsUsage(
fs,
data_metadata_ratio=args.ratio,
target_profile_metadata=metadata_profile,
target_profile_data=data_profile,
)
else:
usage = btrfs.fs_usage.FsUsage(
fs,
target_profile_mixed=metadata_profile,
)
print("Target metadata profile: {}".format(
btrfs.utils.space_profile_description(metadata_profile)))
print("Target data profile: {}".format(
btrfs.utils.space_profile_description(data_profile)))
print("Mixed block groups: {}".format(mixed_groups))
print("Total raw filesystem size: {}".format(btrfs.utils.pretty_size(usage.total)))
print("Device sizes:")
for devid, size in enumerate(device_sizes):
print(" Device {}: {}".format(devid+1, btrfs.utils.pretty_size(size)))
if not mixed_groups:
print("Metadata to data ratio: 1:{}".format(usage.default_data_metadata_ratio))
print("Estimated virtual space to use for metadata: {}".format(
btrfs.utils.pretty_size(usage.estimated_full_allocatable_virtual_metadata)))
print("Estimated virtual space to use for data: {}".format(
btrfs.utils.pretty_size(usage.estimated_full_allocatable_virtual_data)))
else:
if args.ratio is not None:
print("Notice: Metadata to data ratio is not used in mixed mode.")
print("Estimated virtual space to use for metadata and data: {}".format(
btrfs.utils.pretty_size(usage.estimated_full_allocatable_virtual_mixed)))
print("Total unallocatable raw amount: {}".format(
btrfs.utils.pretty_size(usage.unallocatable_hard)))
print("Unallocatable raw bytes per device:")
for key in sorted(usage.dev_usage.keys()):
print(" Device {}: {}".format(
key, btrfs.utils.pretty_size(usage.dev_usage[key].unallocatable_hard)))
if __name__ == '__main__':
try:
main()
except WastedSpaceError as e:
print("Error: {0}".format(e), file=sys.stderr)
sys.exit(1)
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