nfs: add a nfs_ilookup helper

This helper will allow to find an existing NFS inode by the file handle
and fattr.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 7e7a894601b9bda412c1addcdaa0ae934ac6d108..109279d6d91bd61421ef572bbcaa1dfe9fa0e9c8 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -386,6 +386,28 @@ void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 #endif
 EXPORT_SYMBOL_GPL(nfs_setsecurity);
 
+/* Search for inode identified by fh, fileid and i_mode in inode cache. */
+struct inode *
+nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
+{
+       struct nfs_find_desc desc = {
+               .fh     = fh,
+               .fattr  = fattr,
+       };
+       struct inode *inode;
+       unsigned long hash;
+
+       if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
+           !(fattr->valid & NFS_ATTR_FATTR_TYPE))
+               return NULL;
+
+       hash = nfs_fattr_to_ino_t(fattr);
+       inode = ilookup5(sb, hash, nfs_find_actor, &desc);
+
+       dprintk("%s: returning %p\n", __func__, inode);
+       return inode;
+}
+
 /*
  * This is our front-end to iget that looks up inodes by file handle
  * instead of inode number.

diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index bb0eb2c9acca7d19ddf14c65480a9ee27715c561..e52cc55ac300f56b7ea876fe05d3377163d4f358 100644 (file)
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -332,6 +332,7 @@ extern void nfs_zap_caches(struct inode *);
 extern void nfs_invalidate_atime(struct inode *);
 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
                                struct nfs_fattr *, struct nfs4_label *);
+struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);