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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-07-06 15:12:04 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-07-10 23:40:41 -0400 |
| commit | 8383e4602c89857ef926f29ca61ac0a83a614443 (patch) | |
| tree | c60d44dbbfccfa6976d61fb7b10f9f97cc6cda06 /fs/nfs/delegation.h | |
| parent | 13437e12fb43cb7e285ff59248f781c91578eafe (diff) | |
| download | lwn-8383e4602c89857ef926f29ca61ac0a83a614443.tar.gz lwn-8383e4602c89857ef926f29ca61ac0a83a614443.zip | |
NFSv4: Use RCU to protect delegations
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/delegation.h')
| -rw-r--r-- | fs/nfs/delegation.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h index 8f79a3135167..5874ce7fdbae 100644 --- a/fs/nfs/delegation.h +++ b/fs/nfs/delegation.h @@ -22,6 +22,7 @@ struct nfs_delegation { long flags; loff_t maxsize; __u64 change_attr; + struct rcu_head rcu; }; int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); @@ -45,11 +46,16 @@ int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); static inline int nfs_have_delegation(struct inode *inode, int flags) { + struct nfs_delegation *delegation; + int ret = 0; + flags &= FMODE_READ|FMODE_WRITE; - smp_rmb(); - if ((NFS_I(inode)->delegation_state & flags) == flags) - return 1; - return 0; + rcu_read_lock(); + delegation = rcu_dereference(NFS_I(inode)->delegation); + if (delegation != NULL && (delegation->type & flags) == flags) + ret = 1; + rcu_read_unlock(); + return ret; } #else |