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btrfs: balance filter: add limit of processed chunks

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This started as debugging helper, to watch the effects of converting
between raid levels on multiple devices, but could be useful standalone.

In my case the usage filter was not finegrained enough and led to
converting 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>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba 2014-05-07 17:37:51 +02:00 • committed by Chris Mason
parent fc19c5e736
commit 7d824b6f9c
4 changed files with 27 additions and 2 deletions
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3
include/uapi/linux/btrfs.h
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@ -211,7 +211,8 @@ struct btrfs_balance_args {
__u64 flags;
__u64 unused[8];
__u64 limit; /* limit number of processed chunks */
__u64 unused[7];
} __attribute__ ((__packed__));
/* report balance progress to userspace */