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[DLM] fix grant_after_purge softlockup

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In dlm_grant_after_purge() we were holding a hash table read_lock while
calling put_rsb() which potentially removes the rsb from the hash table,
taking the same lock in write.  Fix this by flagging rsb's ahead of time
that have been purged.  Then iteratively read_lock the hash table, find a
flagged rsb, unlock, process rsb.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
David Teigland
2006-05-02 13:34:03 -04:00
committed by Steven Whitehouse
parent d2d7b8a2a7
commit 97a35d1e5f
3 changed files with 30 additions and 15 deletions
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fs/dlm/dlm_internal.h
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@@ -280,6 +280,7 @@ enum rsb_flags {
RSB_NEW_MASTER,
RSB_NEW_MASTER2,
RSB_RECOVER_CONVERT,
RSB_LOCKS_PURGED,
};
static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)