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| author | Josef Bacik <josef@redhat.com> | 2012-03-09 09:51:43 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2012-03-26 16:51:08 -0400 |
| commit | 115391d2315239164e400a8259b26392afccf3bd (patch) | |
| tree | 83f6bd7698b5bfddbe3be57d6411a120eced2399 /fs/btrfs/ioctl.c | |
| parent | 4f2de97acee6532b36dd6e995b858343771ad126 (diff) | |
| download | linux-115391d2315239164e400a8259b26392afccf3bd.tar.bz2 | |
Btrfs: only use the existing eb if it's count isn't 0
We can run into a problem where we find an eb for our existing page already on
the radix tree but it has a ref count of 0. It hasn't yet been removed by RCU
yet so this can cause issues where we will use the EB after free. So do
atomic_inc_not_zero on the exists->refs and if it is zero just do
synchronize_rcu() and try again. We won't have to worry about new allocators
coming in since they will block on the page lock at this point. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs/btrfs/ioctl.c')
0 files changed, 0 insertions, 0 deletions