btrfs: add device delete cancel

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Accept device name "cancel" as a request to cancel running device
deletion operation. The string is literal, in case there's a real device
named "cancel", pass it as full absolute path or as "./cancel"

This works for v1 and v2 ioctls when the device is specified by name.
Moving chunks from the device uses relocation, 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 2021-05-14 21:21:27 +02:00

parent bb059a37c9

commit 67ae34b69c

1 changed files with 24 additions and 19 deletions

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45

fs/btrfs/ioctl.c

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