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NFS: teach nfs_lookup_verify_inode to handle LOOKUP_RCU 

It fails with -ECHILD rather than make an RPC call.

This allows nfs_lookup_revalidate to call it in RCU-walk mode.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
NeilBrown 2014-07-14 11:28:20 +10:00 committed by Trond Myklebust
parent 912a108da7
commit 1fa1e38447
1 changed files with 6 additions and 4 deletions
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10
fs/nfs/dir.c
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@ -1050,6 +1050,8 @@ int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags)
out:
return (inode->i_nlink == 0) ? -ENOENT : 0;
out_force:
if (flags & LOOKUP_RCU)
return -ECHILD;
ret = __nfs_revalidate_inode(server, inode);
if (ret != 0)
return ret;
@ -1135,11 +1137,11 @@ static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
if (!nfs_is_exclusive_create(dir, flags) &&
nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) {
if (flags & LOOKUP_RCU)
return -ECHILD;
if (nfs_lookup_verify_inode(inode, flags))
if (nfs_lookup_verify_inode(inode, flags)) {
if (flags & LOOKUP_RCU)
return -ECHILD;
goto out_zap_parent;
}
goto out_valid;
}