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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/overlayfs.h
parent02b69b284cd7815239fabfe895bfef9a9eb5a3ce (diff)
downloadlinux-a6c6065511411c57167a6cdae0c33263fb662b51.tar.bz2
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/overlayfs.h')
-rw-r--r--fs/overlayfs/overlayfs.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index e76d9d529e64..bdda37fa3f67 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -157,6 +157,10 @@ void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
bool ovl_dentry_is_opaque(struct dentry *dentry);
bool ovl_dentry_is_whiteout(struct dentry *dentry);
void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
+bool ovl_redirect_dir(struct super_block *sb);
+void ovl_clear_redirect_dir(struct super_block *sb);
+const char *ovl_dentry_get_redirect(struct dentry *dentry);
+void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
void ovl_inode_init(struct inode *inode, struct inode *realinode,
bool is_upper);