Btrfs: don't map extent buffer if path->skip_locking is set

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Arne's scrub stuff exposed a problem with mapping the extent buffer in
reada_for_search.  He searches the commit root with multiple threads and with
skip_locking set, so we can race and overwrite node->map_token since node isn't
locked.  So fix this so that we only map the extent buffer if we don't already
have a map_token and skip_locking isn't set.  Without this patch scrub would
panic almost immediately, with the patch it doesn't panic anymore.  Thanks,

Reported-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Josef Bacik <josef@redhat.com>

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This commit is contained in:

Josef Bacik 2011-06-08 14:36:54 -04:00

parent f6a398298d

commit 25b8b936ed

1 changed files with 7 additions and 3 deletions

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fs/btrfs/ctree.c

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