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From:   Honggang LI <honli@redhat.com>
To:     jlbec@evilplan.org, hch@lst.de
Cc:     linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
        bvanassche@acm.org, Honggang Li <honli@redhat.com>
Subject: [PATCH] configfs: calculate the depth of parent item
Date:   Mon,  4 Nov 2019 20:43:22 +0800
Message-Id: <20191104124322.31226-1-honli@redhat.com>
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From: Honggang Li <honli@redhat.com>

When create symbolic link, create_link should calculate the depth
of the parent item. However, both the first and second parameters
of configfs_get_target_path had been set to the target. Broken
symbolic link created.

$ targetcli ls /
o- / ............................................................. [...]
  o- backstores .................................................. [...]
  | o- block ...................................... [Storage Objects: 0]
  | o- fileio ..................................... [Storage Objects: 2]
  | | o- vdev0 .......... [/dev/ramdisk1 (16.0MiB) write-thru activated]
  | | | o- alua ....................................... [ALUA Groups: 1]
  | | |   o- default_tg_pt_gp ........... [ALUA state: Active/optimized]
  | | o- vdev1 .......... [/dev/ramdisk2 (16.0MiB) write-thru activated]
  | |   o- alua ....................................... [ALUA Groups: 1]
  | |     o- default_tg_pt_gp ........... [ALUA state: Active/optimized]
  | o- pscsi ...................................... [Storage Objects: 0]
  | o- ramdisk .................................... [Storage Objects: 0]
  o- iscsi ................................................ [Targets: 0]
  o- loopback ............................................. [Targets: 0]
  o- srpt ................................................. [Targets: 2]
  | o- ib.e89a8f91cb3200000000000000000000 ............... [no-gen-acls]
  | | o- acls ................................................ [ACLs: 2]
  | | | o- ib.e89a8f91cb3200000000000000000000 ........ [Mapped LUNs: 2]
  | | | | o- mapped_lun0 ............................. [BROKEN LUN LINK]
  | | | | o- mapped_lun1 ............................. [BROKEN LUN LINK]
  | | | o- ib.e89a8f91cb3300000000000000000000 ........ [Mapped LUNs: 2]
  | | |   o- mapped_lun0 ............................. [BROKEN LUN LINK]
  | | |   o- mapped_lun1 ............................. [BROKEN LUN LINK]
  | | o- luns ................................................ [LUNs: 2]
  | |   o- lun0 ...... [fileio/vdev0 (/dev/ramdisk1) (default_tg_pt_gp)]
  | |   o- lun1 ...... [fileio/vdev1 (/dev/ramdisk2) (default_tg_pt_gp)]
  | o- ib.e89a8f91cb3300000000000000000000 ............... [no-gen-acls]
  |   o- acls ................................................ [ACLs: 0]
  |   o- luns ................................................ [LUNs: 0]
  o- vhost ................................................ [Targets: 0]

Fixes: e9c03af21cc7 ("configfs: calculate the symlink target only once")
Signed-off-by: Honggang Li <honli@redhat.com>
---
 fs/configfs/symlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index dc5dbf6a81d7..cb61467478ca 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -101,7 +101,7 @@ static int create_link(struct config_item *parent_item,
 =09}
 =09target_sd->s_links++;
 =09spin_unlock(&configfs_dirent_lock);
-=09ret =3D configfs_get_target_path(item, item, body);
+=09ret =3D configfs_get_target_path(parent_item, item, body);
 =09if (!ret)
 =09=09ret =3D configfs_create_link(target_sd, parent_item->ci_dentry,
 =09=09=09=09=09   dentry, body);
--=20
2.21.0