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authorAlex Elder <elder@dreamhost.com>2012-01-12 17:48:10 -0800
committerSage Weil <sage@newdream.net>2012-02-02 12:49:19 -0800
commitd8fb02abdc39f92a1066313e2b17047876afa8f9 (patch)
tree32f8126683dd185411b701b79d23900cf6c02035 /fs/befs
parent32852a81bccd9e3d1953b894966393d1b546576d (diff)
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ceph: create a new session lock to avoid lock inversion
Lockdep was reporting a possible circular lock dependency in dentry_lease_is_valid(). That function needs to sample the session's s_cap_gen and and s_cap_ttl fields coherently, but needs to do so while holding a dentry lock. The s_cap_lock field was being used to protect the two fields, but that can't be taken while holding a lock on a dentry within the session. In most cases, the s_cap_gen and s_cap_ttl fields only get operated on separately. But in three cases they need to be updated together. Implement a new lock to protect the spots updating both fields atomically is required. Signed-off-by: Alex Elder <elder@dreamhost.com> Reviewed-by: Sage Weil <sage@newdream.net>
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