![]() Currently, __dquot_transfer() acquires its own references of dquot structures that will be put into inode. But for OCFS2, this creates a lock inversion between dq_lock (waited on in dqget) and transaction start (started in ocfs2_setattr). Currently, deadlock is impossible because dq_lock is acquired only during dquot_acquire and dquot_release and we already hold a reference to dquot structures in ocfs2_setattr so neither of these functions can be called while we call dquot_transfer. But this is rather subtle and it is hard to teach lockdep about it. So provide __dquot_transfer function that can be passed dquot references directly. OCFS2 can then pass acquired dquot references directly to __dquot_transfer with proper locking. Signed-off-by: Jan Kara <jack@suse.cz> |
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.. | ||
Kconfig | ||
Makefile | ||
compat.c | ||
dquot.c | ||
netlink.c | ||
quota.c | ||
quota_tree.c | ||
quota_tree.h | ||
quota_v1.c | ||
quota_v2.c | ||
quotaio_v1.h | ||
quotaio_v2.h |