btrfs: extend balance filter limit to take minimum and maximum

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The 'limit' filter is underdesigned, it should have been a range for
[min,max], with some relaxed semantics when one of the bounds is
missing. Besides that, using a full u64 for a single value is a waste of
bytes.

Let's fix both by extending the use of the u64 bytes for the [min,max]
range. This can be done in a backward compatible way, the range will be
interpreted only if the appropriate flag is set
(BTRFS_BALANCE_ARGS_LIMIT_RANGE).

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

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David Sterba 2015-10-10 17:16:50 +02:00 • committed by Chris Mason

parent 2849a85422

commit 12907fc798

4 changed files with 67 additions and 3 deletions

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13

include/uapi/linux/btrfs.h

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