Btrfs: try to keep a healthy ratio of metadata vs data block groups

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This patch makes the chunk allocator keep a good ratio of metadata vs data
block groups.  By default for every 8 data block groups, we'll allocate 1
metadata chunk, or about 12% of the disk will be allocated for metadata.  This
can be changed by specifying the metadata_ratio mount option.

This is simply the number of data block groups that have to be allocated to
force a metadata chunk allocation.  By making sure we allocate metadata chunks
more often, we are less likely to get into situations where the whole disk
has been allocated as data block groups.

Signed-off-by: Josef Bacik <jbacik@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Josef Bacik 2009-04-21 17:40:57 -04:00 • committed by Chris Mason

parent 546888da82

commit 97e728d435

4 changed files with 42 additions and 2 deletions

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3

fs/btrfs/ctree.h

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1

fs/btrfs/disk-io.c

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28

fs/btrfs/extent-tree.c

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12

fs/btrfs/super.c

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