Btrfs: barrier before waitqueue_active

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We need a barrir before calling waitqueue_active otherwise we will miss
wakeups.  So in places that do atomic_dec(); then atomic_read() use
atomic_dec_return() which imply a memory barrier (see memory-barriers.txt)
and then add an explicit memory barrier everywhere else that need them.
Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

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Josef Bacik 2012-08-01 15:36:24 -04:00 • committed by Chris Mason

parent 1fa11e265f

commit 66657b318e

5 changed files with 10 additions and 12 deletions

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1

fs/btrfs/compression.c

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7

fs/btrfs/delayed-inode.c

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7

fs/btrfs/disk-io.c

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4

fs/btrfs/inode.c

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3

fs/btrfs/volumes.c

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