From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
This helper will allow to find an existing NFS inode by the file handle
and fattr.
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/nfs/inode.c | 22 ++++++++++++++++++++++
include/linux/nfs_fs.h | 1 +
2 files changed, 23 insertions(+)
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 1de93ba78dc9..a84eab1a18a7 100644
--- 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 bb0eb2c9acca..e52cc55ac300 100644
--- 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);
--
2.11.0
--
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