ovl: Move the copy up helpers to copy_up.c
Right now two copy up helpers are in inode.c. Amir suggested it might be
better to move these to copy_up.c.
There will one more related function which will come in later patch.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 65ee07e..304b268 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -779,6 +779,38 @@ int ovl_copy_up_flags(struct dentry *dentry, int flags)
return err;
}
+static bool ovl_open_need_copy_up(struct dentry *dentry, int flags)
+{
+ /* Copy up of disconnected dentry does not set upper alias */
+ if (ovl_dentry_upper(dentry) &&
+ (ovl_dentry_has_upper_alias(dentry) ||
+ (dentry->d_flags & DCACHE_DISCONNECTED)))
+ return false;
+
+ if (special_file(d_inode(dentry)->i_mode))
+ return false;
+
+ if (!(OPEN_FMODE(flags) & FMODE_WRITE) && !(flags & O_TRUNC))
+ return false;
+
+ return true;
+}
+
+int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags)
+{
+ int err = 0;
+
+ if (ovl_open_need_copy_up(dentry, file_flags)) {
+ err = ovl_want_write(dentry);
+ if (!err) {
+ err = ovl_copy_up_flags(dentry, file_flags);
+ ovl_drop_write(dentry);
+ }
+ }
+
+ return err;
+}
+
int ovl_copy_up(struct dentry *dentry)
{
return ovl_copy_up_flags(dentry, 0);