Added nfs4_vfh_getdentry() that traverses all the dcache
entries for the nfs mount and looks for a matching file handle.
The dentry with a matching file handle can then be used for
recovering from a FHEXPIRED error.
Signed-off-by: Matthew Treinish <treinish@xxxxxxxxxxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3706c44..ee62c1e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2547,6 +2547,53 @@ static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qst
return err;
}
+/* In the case of gettattr only a fh is given, and we need a VFS object to do
+ * vfh recovery. This function traverses the dcache to find the dentry with
+ * a matching fh
+ */
+struct dentry *nfs4_vfh_getdentry(struct nfs_server *server, struct nfs_fh *fhandle)
+{
+ struct dentry *this_parent;
+ struct list_head *next;
+ struct dentry *d_root = server->rootdentry;
+
+ this_parent = d_root;
+repeat:
+ next = this_parent->d_subdirs.next;
+resume:
+ while (next != &this_parent->d_subdirs) {
+ struct list_head *tmp = next;
+ struct dentry *dentry = list_entry(tmp, struct dentry,
+ d_u.d_child);
+ next = tmp->next;
+ /* Compare dentry's fh with one provided */
+ if (dentry && dentry->d_inode && &dentry->d_name)
+ if (!nfs_compare_fh(NFS_FH(dentry->d_inode), fhandle))
+ return dget(dentry);
+
+ if (!list_empty(&dentry->d_subdirs)) {
+ this_parent = dentry;
+ goto repeat;
+ }
+ }
+ if (this_parent != d_root) {
+ struct dentry *child = this_parent;
+ struct dentry *new = this_parent->d_parent;
+ /*
+ * might go back up the wrong parent if we have had a rename
+ * or deletion return ESTALE if it is renamed or deleted
+ */
+ if (new != this_parent->d_parent ||
+ (this_parent->d_flags & DCACHE_DISCONNECTED)) {
+ return ERR_PTR(-ESTALE);
+ }
+ this_parent = new;
+ next = child->d_u.d_child.next;
+ goto resume;
+ }
+ return ERR_PTR(-ENOENT);
+}
+
static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
struct nfs_server *server = NFS_SERVER(inode);
--
1.7.4.4
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