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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>
This commit is contained in:
Peng Tao 2017-06-29 06:34:51 -07:00 committed by Anna Schumaker
parent 774d9513a3
commit f174ff7a0a
2 changed files with 23 additions and 0 deletions
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22
fs/nfs/inode.c
View File

@ -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.

1
include/linux/nfs_fs.h
View File

@ -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);