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authorMiklos Szeredi <mszeredi@redhat.com>2016-12-16 11:02:56 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2016-12-16 11:02:56 +0100
commita6c6065511411c57167a6cdae0c33263fb662b51 (patch)
treecd2c7904884c557a0d7d26a88efc737a8885407a /fs/overlayfs/ovl_entry.h
parent02b69b284cd7815239fabfe895bfef9a9eb5a3ce (diff)
ovl: redirect on rename-dir
Current code returns EXDEV when a directory would need to be copied up to move. We could copy up the directory tree in this case, but there's another, simpler solution: point to old lower directory from moved upper directory. This is achieved with a "trusted.overlay.redirect" xattr storing the path relative to the root of the overlay. After such attribute has been set, the directory can be moved without further actions required. This is a backward incompatible feature, old kernels won't be able to correctly mount an overlay containing redirected directories. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/ovl_entry.h')
-rw-r--r--fs/overlayfs/ovl_entry.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index eb29882b6a54..d14bca1850d9 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -13,6 +13,7 @@ struct ovl_config {
char *upperdir;
char *workdir;
bool default_permissions;
+ bool redirect_dir;
};
/* private information held for overlayfs's superblock */