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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>
This commit is contained in:
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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@ -217,7 +217,18 @@ struct btrfs_balance_args {
__u64 flags;
__u64 limit; /* limit number of processed chunks */
/*
* BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
* BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
* and maximum
*/
union {
__u64 limit; /* limit number of processed chunks */
struct {
__u32 limit_min;
__u32 limit_max;
};
};
__u64 unused[7];
} __attribute__ ((__packed__));