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authorVivek Goyal <vgoyal@redhat.com>2018-05-11 17:49:32 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2018-07-20 09:56:14 +0200
commit60124877b9ec4fa5a34ddeeedba473820888d4b2 (patch)
tree8d0c99d3c5e5cb72065915960b0d7cbf51d0078f /fs/overlayfs/util.c
parentovl: Add an inode flag OVL_CONST_INO (diff)
downloadlinux-60124877b9ec4fa5a34ddeeedba473820888d4b2.tar.xz
linux-60124877b9ec4fa5a34ddeeedba473820888d4b2.zip
ovl: Do not set dentry type ORIGIN for broken hardlinks
If a dentry has copy up origin, we set flag OVL_PATH_ORIGIN. So far this decision was easy that we had to check only for oe->numlower and if it is non-zero, we knew there is copy up origin. (For non-dir we installed origin dentry in lowerstack[0]). But we don't create ORGIN xattr for broken hardlinks (index=off). And with metacopy feature it is possible that we will install lowerstack[0] but ORIGIN xattr is not there. It is data dentry of upper metacopy dentry which has been found using regular name based lookup or using REDIRECT. So with addition of this new case, just presence of oe->numlower is not sufficient to guarantee that ORIGIN xattr is present. So to differentiate between two cases, look at OVL_CONST_INO flag. If this flag is set and upperdentry is there, that means it can be marked as type ORIGIN. OVL_CONST_INO is not set if lower hardlink is broken or will be broken over copy up. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/util.c')
-rw-r--r--fs/overlayfs/util.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 61ace2de3019..1aa9e0c5a327 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -133,7 +133,8 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
* Non-dir dentry can hold lower dentry of its copy up origin.
*/
if (oe->numlower) {
- type |= __OVL_PATH_ORIGIN;
+ if (ovl_test_flag(OVL_CONST_INO, d_inode(dentry)))
+ type |= __OVL_PATH_ORIGIN;
if (d_is_dir(dentry) ||
!ovl_has_upperdata(d_inode(dentry)))
type |= __OVL_PATH_MERGE;