[PATCH 1/2] ceph: factor out ceph_lookup_inode()

[Luis Henriques]

This function will be used by __fh_to_dentry and by the quotas code, to find
quota realm inodes that are not visible in the mountpoint.

Signed-off-by: Luis Henriques <lhenriq...@suse.com>
---
 fs/ceph/export.c | 14 +++++++++++++-
 fs/ceph/super.h  |  1 +
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index 3c59ad180ef0..0d8ead82c816 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -59,7 +59,7 @@ static int ceph_encode_fh(struct inode *inode, u32 *rawfh, 
int *max_len,
        return type;
 }
 
-static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
+struct inode *ceph_lookup_inode(struct super_block *sb, u64 ino)
 {
        struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
        struct inode *inode;
@@ -92,12 +92,24 @@ static struct dentry *__fh_to_dentry(struct super_block 
*sb, u64 ino)
                ceph_mdsc_put_request(req);
                if (!inode)
                        return ERR_PTR(-ESTALE);
+               if (err)
+                       return ERR_PTR(err);
                if (inode->i_nlink == 0) {
                        iput(inode);
                        return ERR_PTR(-ESTALE);
                }
        }
 
+       return inode;
+}
+
+static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
+{
+       struct inode *inode = ceph_lookup_inode(sb, ino);
+
+       if (IS_ERR(inode))
+               return ERR_CAST(inode);
+
        return d_obtain_alias(inode);
 }
 
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index dfb64a5211b6..ce51e98b08ec 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1061,6 +1061,7 @@ extern long ceph_ioctl(struct file *file, unsigned int 
cmd, unsigned long arg);
 
 /* export.c */
 extern const struct export_operations ceph_export_ops;
+struct inode *ceph_lookup_inode(struct super_block *sb, u64 ino);
 
 /* locks.c */
 extern __init void ceph_flock_init(void);