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btrfs-progs: balance: add stripes filter

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Add new balance filter 'stripes=<range>' to process only chunks that are
spread accross given number of chunks.

The range minimum and maximum are inclusive.

Signed-off-by: Gabríel Arthúr Pétursson <gabriel@system.is>
[ reworked a bit to use the range helpers, dropped the single value
  for stripes ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Gabríel Arthúr Pétursson 2015-09-28 22:33:04 +00:00 committed by David Sterba
parent 7dff5c9c9b
commit 0826a8ddb9
4 changed files with 26 additions and 1 deletions
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6
Documentation/btrfs-balance.asciidoc
View File

@ -137,6 +137,12 @@ only the single value format.
+
The range minimum and maximum are inclusive.
*stripes*::
Balances only block groups which have the given number of stripes. The
parameter is a range specified as <start..end>.
+
The range minimum and maximum are inclusive.
*soft*::
Takes no parameters. Only has meaning when converting between profiles.
When doing convert from one profile to another and soft mode is on,

16
cmds-balance.c
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@ -319,6 +319,18 @@ static int parse_filters(char *filters, struct btrfs_balance_args *args)
args->flags &= ~BTRFS_BALANCE_ARGS_LIMIT_RANGE;
args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
}
} else if (!strcmp(this_char, "stripes")) {
if (!value || !*value) {
fprintf(stderr,
"the stripes filter requires an argument\n");
return 1;
}
if (parse_range_u32(value, &args->stripes_min,
&args->stripes_max)) {
fprintf(stderr, "Invalid stripes argument\n");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_STRIPES_RANGE;
} else {
fprintf(stderr, "Unrecognized balance option '%s'\n",
this_char);
@ -359,6 +371,10 @@ static void dump_balance_args(struct btrfs_balance_args *args)
printf(", limit=");
print_range_u32(args->limit_min, args->limit_max);
}
if (args->flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE) {
printf(", stripes=");
print_range_u32(args->stripes_min, args->stripes_max);
}
printf("\n");
}

4
ioctl.h
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@ -239,7 +239,9 @@ struct btrfs_balance_args {
__u32 limit_max;
};
};
__u64 unused[7];
__u32 stripes_min;
__u32 stripes_max;
__u64 unused[6];
} __attribute__ ((__packed__));
/* report balance progress to userspace */

1
volumes.h
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@ -137,6 +137,7 @@ struct map_lookup {
#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
#define BTRFS_BALANCE_ARGS_LIMIT_RANGE (1ULL << 6)
#define BTRFS_BALANCE_ARGS_STRIPES_RANGE (1ULL << 7)
/*
* Profile changing flags. When SOFT is set we won't relocate chunk if