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disk_util: allocate the maximum number of usable inodes

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This change changes the default 'bytes-per-inode' ration from 16K to 4K,
the block size. To prevent this from wasting too much space change the
inode size from the default 256 to the minimum size, 128. Larger inodes
are used to store extended attributes more efficiently but since we do
not use SELinux the majority of files do not have security attributes.

These defaults may be modified via the new `bytes_per_inode` and
`inode_size` options.
This commit is contained in:
Michael Marineau 2015-02-11 17:05:36 -08:00
parent f5ec568cee
commit d09aeb368c
1 changed files with 9 additions and 2 deletions
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11
build_library/disk_util
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@ -45,9 +45,10 @@ def LoadPartitionConfig(options):
valid_layout_keys = set(( valid_layout_keys = set((
'_comment', 'type', 'num', 'label', 'blocks', 'block_size', 'fs_blocks', '_comment', 'type', 'num', 'label', 'blocks', 'block_size', 'fs_blocks',
'fs_block_size', 'fs_type', 'features', 'uuid', 'part_alignment', 'mount', 'fs_block_size', 'fs_type', 'features', 'uuid', 'part_alignment', 'mount',
'binds', 'fs_subvolume')) 'binds', 'fs_subvolume', 'fs_bytes_per_inode', 'fs_inode_size'))
integer_layout_keys = set(( integer_layout_keys = set((
'blocks', 'block_size', 'fs_blocks', 'fs_block_size', 'part_alignment')) 'blocks', 'block_size', 'fs_blocks', 'fs_block_size', 'part_alignment',
'fs_bytes_per_inode', 'fs_inode_size'))
required_layout_keys = set(('type', 'num', 'label', 'blocks')) required_layout_keys = set(('type', 'num', 'label', 'blocks'))
filename = options.disk_layout_file filename = options.disk_layout_file
@ -108,6 +109,10 @@ def LoadPartitionConfig(options):
if part.get('fs_type', None) != 'btrfs': if part.get('fs_type', None) != 'btrfs':
raise InvalidLayout('Invalid fs: only btrfs supports subvolumes') raise InvalidLayout('Invalid fs: only btrfs supports subvolumes')
if 'fs_bytes_per_inode' in part or 'fs_inode_size' in part:
if part.get('fs_type', None) not in ('ext2', 'ext4'):
raise InvalidLayout('Invalid fs: only extX supports inode options')
def Align(count, alignment): def Align(count, alignment):
offset = count % alignment offset = count % alignment
if offset: if offset:
@ -393,6 +398,8 @@ def FormatExt(part, device):
Sudo(['mke2fs', '-q', Sudo(['mke2fs', '-q',
'-t', part['fs_type'], '-t', part['fs_type'],
'-b', part['fs_block_size'], '-b', part['fs_block_size'],
'-i', part.get('fs_bytes_per_inode', part['fs_block_size']),
'-I', part.get('fs_inode_size', 128),
device, device,
part['fs_blocks']]) part['fs_blocks']])