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authorVivek Goyal <vgoyal@redhat.com>2018-05-11 17:49:30 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2018-07-20 09:56:09 +0200
commit4f93b426ab3930952eca6c5c456c2223a3adcbf5 (patch)
tree17fd2e4590d6c1c2823598cecca0e8700ab2d09b /fs/overlayfs/util.c
parentovl: Modify ovl_lookup() and friends to lookup metacopy dentry (diff)
downloadlinux-4f93b426ab3930952eca6c5c456c2223a3adcbf5.tar.xz
linux-4f93b426ab3930952eca6c5c456c2223a3adcbf5.zip
ovl: Copy up meta inode data from lowest data inode
So far lower could not be a meta inode. So whenever it was time to copy up data of a meta inode, we could copy it up from top most lower dentry. But now lower itself can be a metacopy inode. That means data copy up needs to take place from a data inode in metacopy inode chain. Find lower data inode in the chain and use that for data copy up. Introduced a helper called ovl_path_lowerdata() to find the lower data inode chain. 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.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index ab9a8fae0f99..32ff67fa0bfb 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -164,6 +164,18 @@ void ovl_path_lower(struct dentry *dentry, struct path *path)
}
}
+void ovl_path_lowerdata(struct dentry *dentry, struct path *path)
+{
+ struct ovl_entry *oe = dentry->d_fsdata;
+
+ if (oe->numlower) {
+ path->mnt = oe->lowerstack[oe->numlower - 1].layer->mnt;
+ path->dentry = oe->lowerstack[oe->numlower - 1].dentry;
+ } else {
+ *path = (struct path) { };
+ }
+}
+
enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path)
{
enum ovl_path_type type = ovl_path_type(dentry);