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btrfs-progs: balance: enhance the usage filter with range

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

The 'usage=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 2015-10-22 10:26:10 +02:00
parent 40db5cd7ff
commit 5a657cad46
1 changed files with 24 additions and 5 deletions
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29
cmds-balance.c
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@ -244,11 +244,30 @@ static int parse_filters(char *filters, struct btrfs_balance_args *args)
"an argument\n");
return 1;
}
if (parse_u64(value, &args->usage) ||
args->usage > 100) {
fprintf(stderr, "Invalid usage argument: %s\n",
value);
return 1;
if (parse_u64(value, &args->usage)) {
if (parse_range_u32(value, &args->usage_min,
&args->usage_max)) {
fprintf(stderr,
"Invalid usage argument: %s\n",
value);
return 1;
}
if (args->usage_max > 100) {
fprintf(stderr,
"Invalid usage argument: %s\n",
value);
}
args->flags &= ~BTRFS_BALANCE_ARGS_USAGE;
args->flags |= BTRFS_BALANCE_ARGS_USAGE_RANGE;
} else {
if (args->usage > 100) {
fprintf(stderr,
"Invalid usage argument: %s\n",
value);
return 1;
}
args->flags &= ~BTRFS_BALANCE_ARGS_USAGE_RANGE;
args->flags |= BTRFS_BALANCE_ARGS_USAGE;
}
args->flags |= BTRFS_BALANCE_ARGS_USAGE;
} else if (!strcmp(this_char, "devid")) {