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Btrfs: implement online profile changing

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Profile changing is done by launching a balance with
BTRFS_BALANCE_CONVERT bits set and target fields of respective
btrfs_balance_args structs initialized.  Profile reducing code in this
case will pick restriper's target profile if it's available instead of
doing a blind reduce.  If target profile is not yet available it goes
back to a plain reduce.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
2012-01-16 22:04:48 +02:00
parent 70922617b0
commit e4d8ec0f65
3 changed files with 129 additions and 1 deletions
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5
fs/btrfs/volumes.h
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@ -196,6 +196,9 @@ struct map_lookup {
#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
BTRFS_BALANCE_SYSTEM | \
BTRFS_BALANCE_METADATA)
#define BTRFS_BALANCE_FORCE (1ULL << 3)
/*
* Balance filters
*/
@ -205,6 +208,8 @@ struct map_lookup {
#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
struct btrfs_balance_args;
struct btrfs_balance_control {
struct btrfs_fs_info *fs_info;