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nfs: per-name sillyunlink exclusion

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use d_alloc_parallel() for sillyunlink/lookup exclusion and
explicit rwsem (nfs_rmdir() being a writer and nfs_call_unlink() -
a reader) for rmdir/sillyunlink one.

That ought to make lookup/readdir/!O_CREAT atomic_open really
parallel on NFS.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-04-28 23:56:31 -04:00
parent 9ac3d3e846
commit 884be17535
7 changed files with 71 additions and 174 deletions
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4
include/linux/nfs_xdr.h
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@ -1468,10 +1468,10 @@ struct nfs_pgio_completion_ops {
};
struct nfs_unlinkdata {
struct hlist_node list;
struct nfs_removeargs args;
struct nfs_removeres res;
struct inode *dir;
struct dentry *dentry;
wait_queue_head_t wq;
struct rpc_cred *cred;
struct nfs_fattr dir_attr;
long timeout;