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NFSv4: Ensure delegation recall and byte range lock removal don't conflict

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Add a mutex to the struct nfs4_state_owner to ensure that delegation
recall doesn't conflict with byte range lock removal.

Note that we nest the new mutex _outside_ the state manager reclaim
protection (nfsi->rwsem) in order to avoid deadlocks.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-02-07 10:54:07 -05:00
parent 37380e4264
commit 65b62a29f7
4 changed files with 16 additions and 2 deletions
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1
fs/nfs/nfs4_fs.h
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@ -93,6 +93,7 @@ struct nfs4_state_owner {
struct list_head so_states;
struct nfs_seqid_counter so_seqid;
seqcount_t so_reclaim_seqcount;
struct mutex so_delegreturn_mutex;
};
enum {