ovl: move copy up lock out

Move ovl_copy_up_start()/ovl_copy_up_end() out so that it's used for both
tempfile and workdir copy ups.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 15668d3..0d9de35 100644 (file)
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -506,37 +506,18 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
 
        /* Should we copyup with O_TMPFILE or with workdir? */
        if (S_ISREG(c->stat.mode) && ofs->tmpfile) {
-               err = ovl_copy_up_start(c->dentry);
-               /* err < 0: interrupted, err > 0: raced with another copy-up */
-               if (unlikely(err)) {
-                       pr_debug("ovl_copy_up_start(%pd2) = %i\n", c->dentry,
-                                err);
-                       if (err > 0)
-                               err = 0;
-                       goto out_done;
-               }
                c->tmpfile = true;
-               err = ovl_copy_up_locked(c);
-               ovl_copy_up_end(c->dentry);
-               goto out_done;
+               return  ovl_copy_up_locked(c);
        }
 
        err = -EIO;
        if (lock_rename(c->workdir, c->upperdir) != NULL) {
                pr_err("overlayfs: failed to lock workdir+upperdir\n");
-               goto out_unlock;
-       }
-       if (ovl_dentry_upper(c->dentry)) {
-               /* Raced with another copy-up?  Nothing to do, then... */
-               err = 0;
-               goto out_unlock;
+       } else {
+               err = ovl_copy_up_locked(c);
+               unlock_rename(c->workdir, c->upperdir);
        }
 
-       err = ovl_copy_up_locked(c);
-out_unlock:
-       unlock_rename(c->workdir, c->upperdir);
-out_done:
-
        return err;
 }
 
@@ -580,8 +561,15 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
        }
        ovl_do_check_copy_up(ctx.lowerpath.dentry);
 
-       err = ovl_do_copy_up(&ctx);
-
+       err = ovl_copy_up_start(dentry);
+       /* err < 0: interrupted, err > 0: raced with another copy-up */
+       if (unlikely(err)) {
+               if (err > 0)
+                       err = 0;
+       } else {
+               err = ovl_do_copy_up(&ctx);
+               ovl_copy_up_end(dentry);
+       }
        do_delayed_call(&done);
 
        return err;