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authorMiklos Szeredi <mszeredi@redhat.com>2016-07-29 12:05:25 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2016-07-29 12:05:25 +0200
commit30c17ebfb2a11468fe825de19afa3934ee98bfd2 (patch)
tree231bafeafebab56786642d36526782dbe42f49e4
parent29c42e80ba5b1e59a4f427b44e2bdebd347b9409 (diff)
ovl: simplify empty checking
The empty checking logic is duplicated in ovl_check_empty_and_clear() and ovl_remove_and_whiteout(), except the condition for clearing whiteouts is different: ovl_check_empty_and_clear() checked for being upper ovl_remove_and_whiteout() checked for merge OR lower Move the intersection of those checks (upper AND merge) into ovl_check_empty_and_clear() and simplify ovl_remove_and_whiteout(). Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
-rw-r--r--fs/overlayfs/dir.c50
1 files changed, 21 insertions, 29 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index ddda948109d3..12bcd07b9e32 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -307,23 +307,29 @@ static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry)
{
int err;
struct dentry *ret = NULL;
+ enum ovl_path_type type = ovl_path_type(dentry);
LIST_HEAD(list);
err = ovl_check_empty_dir(dentry, &list);
- if (err)
+ if (err) {
ret = ERR_PTR(err);
- else {
- /*
- * If no upperdentry then skip clearing whiteouts.
- *
- * Can race with copy-up, since we don't hold the upperdir
- * mutex. Doesn't matter, since copy-up can't create a
- * non-empty directory from an empty one.
- */
- if (ovl_dentry_upper(dentry))
- ret = ovl_clear_empty(dentry, &list);
+ goto out_free;
}
+ /*
+ * When removing an empty opaque directory, then it makes no sense to
+ * replace it with an exact replica of itself.
+ *
+ * If no upperdentry then skip clearing whiteouts.
+ *
+ * Can race with copy-up, since we don't hold the upperdir mutex.
+ * Doesn't matter, since copy-up can't create a non-empty directory
+ * from an empty one.
+ */
+ if (OVL_TYPE_UPPER(type) && OVL_TYPE_MERGE(type))
+ ret = ovl_clear_empty(dentry, &list);
+
+out_free:
ovl_cache_free(&list);
return ret;
@@ -551,24 +557,10 @@ static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir)
return -EROFS;
if (is_dir) {
- if (OVL_TYPE_MERGE_OR_LOWER(ovl_path_type(dentry))) {
- opaquedir = ovl_check_empty_and_clear(dentry);
- err = PTR_ERR(opaquedir);
- if (IS_ERR(opaquedir))
- goto out;
- } else {
- LIST_HEAD(list);
-
- /*
- * When removing an empty opaque directory, then it
- * makes no sense to replace it with an exact replica of
- * itself. But emptiness still needs to be checked.
- */
- err = ovl_check_empty_dir(dentry, &list);
- ovl_cache_free(&list);
- if (err)
- goto out;
- }
+ opaquedir = ovl_check_empty_and_clear(dentry);
+ err = PTR_ERR(opaquedir);
+ if (IS_ERR(opaquedir))
+ goto out;
}
err = ovl_lock_rename_workdir(workdir, upperdir);