Btrfs: lock the transition from dirty to writeback for an eb

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There is a small window where an eb can have no IO bits set on it, which
could potentially result in extent_buffer_under_io() returning false when we
want it to return true, which could result in not fun things happening.  So
in order to protect this case we need to hold the refs_lock when we make
this transition to make sure we get reliable results out of
extent_buffer_udner_io().  Thanks,

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

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Josef Bacik 2012-07-20 16:25:24 -04:00 • committed by Chris Mason

parent 594831c4b2

commit 51561ffec9

1 changed files with 9 additions and 0 deletions

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fs/btrfs/extent_io.c

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