btrfs: Stop using call_rcu for device freeing

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btrfs_device structs are freed from RCU context since device iteration
is protected by RCU. Currently this is achieved by using call_rcu since
no blocking functions are called within btrfs_free_device. Future
refactoring of pending/pinned chunks will require calling sleeping
functions.

This patch is in preparation for these changes by simply switching from
RCU callbacks to explicit calls of synchronize_rcu and calling
btrfs_free_device directly. This is functionally equivalent, making sure
that there are no readers at that time.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Nikolay Borisov 2019-03-27 14:24:11 +02:00 • committed by David Sterba

parent 4ca7365606

commit 8e75fd893b

2 changed files with 8 additions and 13 deletions

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20

fs/btrfs/volumes.c

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1

fs/btrfs/volumes.h

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