btrfs: add cancellation to resize

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Accept literal string "cancel" as resize operation and interpret that
as a request to cancel the running operation. If it's running, wait
until it finishes current work and return ECANCELED.

Shrinking resize uses relocation to move the chunks away, use the
conditional exclusive operation start and cancellation helpers.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2021-05-18 21:12:33 +02:00

parent 17aaa434ed

commit bb059a37c9

1 changed files with 26 additions and 21 deletions

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fs/btrfs/ioctl.c

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