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btrfs-progs: balance filter: add limit of processed chunks 

Add more control to the balance behaviour.

Usage filter may not be finegrained enough and can lead to moving too
many chunks at once. Another example use is in connection with
drange+devid or vrange filters that allow to work with a specific chunk
or even with a chunk on a given device.

The limit filter applies last, the value of 0 means no limiting.

CC: Ilya Dryomov <idryomov@gmail.com>
CC: Hugo Mills <hugo@carfax.org.uk>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
David Sterba 2014-05-07 17:38:00 +02:00
parent 9875a10133
commit 266c81a910
3 changed files with 18 additions and 1 deletions
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14
cmds-balance.c
View File

@ -218,6 +218,18 @@ static int parse_filters(char *filters, struct btrfs_balance_args *args)
args->flags |= BTRFS_BALANCE_ARGS_CONVERT;
} else if (!strcmp(this_char, "soft")) {
args->flags |= BTRFS_BALANCE_ARGS_SOFT;
} else if (!strcmp(this_char, "limit")) {
if (!value || !*value) {
fprintf(stderr,
"the limit filter requires an argument\n");
return 1;
}
if (parse_u64(value, &args->limit)) {
fprintf(stderr, "Invalid limit argument: %s\n",
value);
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
} else {
fprintf(stderr, "Unrecognized balance option '%s'\n",
this_char);
@ -252,6 +264,8 @@ static void dump_balance_args(struct btrfs_balance_args *args)
printf(", vrange=%llu..%llu",
(unsigned long long)args->vstart,
(unsigned long long)args->vend);
if (args->flags & BTRFS_BALANCE_ARGS_LIMIT)
printf(", limit=%llu", (unsigned long long)args->limit);
printf("\n");
}

4
ioctl.h
View File

@ -194,7 +194,9 @@ struct btrfs_balance_args {
__u64 flags;
__u64 unused[8];
__u64 limit;
__u64 unused[7];
} __attribute__ ((__packed__));
struct btrfs_balance_progress {

1
volumes.h
View File

@ -130,6 +130,7 @@ struct map_lookup {
#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
/*
* Profile changing flags. When SOFT is set we won't relocate chunk if