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btrfs-progs: balance: enhance the limit fiter with range

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We can do more with the balance filter. Enhance it so we can specify
also the minimum number of block groups to process. The 'limit' filter
now accepts a range (a..b, can be partial) and needs kernel support.

The 'limit=value' filter is equivalent to 'limit=..value' but works on
older kernels as well.

The min/max values are 32bit, unlike the single-value limit which is
64bit.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2015-10-12 00:52:43 +02:00
parent 45e9bf8098
commit 7dff5c9c9b
1 changed files with 12 additions and 4 deletions
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16
cmds-balance.c
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@ -306,11 +306,19 @@ static int parse_filters(char *filters, struct btrfs_balance_args *args)
return 1;
}
if (parse_u64(value, &args->limit)) {
fprintf(stderr, "Invalid limit argument: %s\n",
value);
return 1;
if (parse_range_u32(value, &args->limit_min,
&args->limit_max)) {
fprintf(stderr,
"Invalid limit argument: %s\n",
value);
return 1;
}
args->flags &= ~BTRFS_BALANCE_ARGS_LIMIT;
args->flags |= BTRFS_BALANCE_ARGS_LIMIT_RANGE;
} else {
args->flags &= ~BTRFS_BALANCE_ARGS_LIMIT_RANGE;
args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
}
args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
} else {
fprintf(stderr, "Unrecognized balance option '%s'\n",
this_char);