btrfs: protect exclusive_operation by super_lock

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The exclusive operation is now atomically checked and set using bit
operations. Switch it to protection by spinlock. The super block lock is
not frequently used and adding a new lock seems like an overkill so it
should be safe to reuse it.

The reason to use spinlock is to enhance the locking context so more
checks can be done, eg. allowing the same exclusive operation enter
the exclop section and cancel the running one. This will be used for
resize and device delete.

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 17:42:30 +02:00

parent 24880be59c

commit 0d7ed32c1e

2 changed files with 17 additions and 3 deletions

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4

fs/btrfs/ctree.h

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16

fs/btrfs/ioctl.c

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