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authorNeilBrown <neilb@suse.de>2014-07-14 11:28:20 +1000
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-08-03 17:14:12 -0400
commit912a108da767ae75cc929d2854e698aff527ec5d (patch)
tree7ae1fda9f3512f9fabd1cc6d2467b4a9c416d745 /include/linux/nfs_fs.h
parentf3324a2a94c229831cfd42d871902cd4a9bd5e0f (diff)
downloadop-kernel-dev-912a108da767ae75cc929d2854e698aff527ec5d.zip
op-kernel-dev-912a108da767ae75cc929d2854e698aff527ec5d.tar.gz
NFS: teach nfs_neg_need_reval to understand LOOKUP_RCU
This requires nfs_check_verifier to take an rcu_walk flag, and requires an rcu version of nfs_revalidate_inode which returns -ECHILD rather than making an RPC call. With this, nfs_lookup_revalidate can call nfs_neg_need_reval in RCU-walk mode. We can also move the LOOKUP_RCU check past the nfs_check_verifier() call in nfs_lookup_revalidate. If RCU_WALK prevents nfs_check_verifier or nfs_neg_need_reval from doing a full check, they return a status indicating that a revalidation is required. As this revalidation will not be possible in RCU_WALK mode, -ECHILD will ultimately be returned, which is the desired result. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'include/linux/nfs_fs.h')
-rw-r--r--include/linux/nfs_fs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index e30f605..60cd9e3 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -352,6 +352,7 @@ extern int nfs_release(struct inode *, struct file *);
extern int nfs_attribute_timeout(struct inode *inode);
extern int nfs_attribute_cache_expired(struct inode *inode);
extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
+extern int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_setattr(struct dentry *, struct iattr *);
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