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Btrfs: do not merge logged extents if we've removed them from the tree 

You can run into this problem where if somebody is fsyncing and writing out
the existing extents you will have removed the extent map from the em tree,
but it's still valid for the current fsync so we go ahead and write it.  The
problem is we unconditionally try to merge it back into the em tree, but if
we've removed it from the em tree that will cause use after free problems.
Fix this to only merge if we are still a part of the tree.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-01-28 09:45:20 -05:00
parent 1eafa6c737
commit 222c81dc38
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/extent_map.c
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@ -289,7 +289,8 @@ out:
void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em)
{
clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
try_merge_map(tree, em);
if (em->in_tree)
try_merge_map(tree, em);
}
/**