btrfs: track exclusive filesystem operation in flags

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There are several operations, usually started from ioctls, that cannot
run concurrently. The status is tracked in
mutually_exclusive_operation_running as an atomic_t. We can easily track
the status as one of the per-filesystem flag bits with same
synchronization guarantees.

The conversion replaces:

* atomic_xchg(..., 1)    ->   test_and_set_bit(FLAG, ...)
* atomic_set(..., 0)     ->   clear_bit(FLAG, ...)

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

...

This commit is contained in:

David Sterba 2017-03-28 14:44:21 +02:00

parent 48a89bc4f2

commit 171938e528

4 changed files with 25 additions and 26 deletions

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7

fs/btrfs/ctree.h

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5

fs/btrfs/dev-replace.c

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33

fs/btrfs/ioctl.c

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6

fs/btrfs/volumes.c

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