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History

Alex Elder d8fb02abdc 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>

2012-02-02 12:49:19 -08:00

addr.c

ceph: use i_ceph_lock instead of i_lock

2011-12-07 10:46:44 -08:00

caps.c

ceph: create a new session lock to avoid lock inversion

2012-02-02 12:49:19 -08:00

ceph_frag.c

ceph: factor out libceph from Ceph file system

2010-10-20 15:37:28 -07:00

debugfs.c

ceph: explicitly reference rename old_dentry parent dir in request