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authorzhangyi (F) <yi.zhang@huawei.com>2017-07-04 13:02:27 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2017-11-09 10:23:27 +0100
commit07f6fff148364ad7c0174d6536a124a0679177a2 (patch)
tree6a69a726ecb812d73bec841c6f91e7c4ed1a0c9e /fs/overlayfs/dir.c
parent95e598e7ace2d89717cc3370c2126570667e2007 (diff)
downloadlinux-07f6fff148364ad7c0174d6536a124a0679177a2.tar.bz2
ovl: fix rmdir problem on non-merge dir with origin xattr
An "origin && non-merge" upper dir may have leftover whiteouts that were created in past mount. overlayfs does no clear this dir when we delete it, which may lead to rmdir fail or temp file left in workdir. Simple reproducer: mkdir lower upper work merge mkdir -p lower/dir touch lower/dir/a mount -t overlay overlay -olowerdir=lower,upperdir=upper,\ workdir=work merge rm merge/dir/a umount merge rm -rf lower/* touch lower/dir (*) mount -t overlay overlay -olowerdir=lower,upperdir=upper,\ workdir=work merge rm -rf merge/dir Syslog dump: overlayfs: cleanup of 'work/#7' failed (-39) (*): if we do not create the regular file, the result is different: rm: cannot remove "dir/": Directory not empty This patch adds a check for the case of non-merge dir that may contain whiteouts, and calls ovl_check_empty_dir() to check and clear whiteouts from upper dir when an empty dir is being deleted. [amir: split patch from ovl_check_empty_dir() cleanup rename ovl_is_origin() to ovl_may_have_whiteouts() check OVL_WHITEOUTS flag instead of checking origin xattr] Signed-off-by: zhangyi (F) <yi.zhang@huawei.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/dir.c')
-rw-r--r--fs/overlayfs/dir.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 4edef400fe51..ef533198be45 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -181,6 +181,11 @@ static bool ovl_type_origin(struct dentry *dentry)
return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
}
+static bool ovl_may_have_whiteouts(struct dentry *dentry)
+{
+ return ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry));
+}
+
static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
struct cattr *attr, struct dentry *hardlink)
{
@@ -697,8 +702,9 @@ static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
struct dentry *opaquedir = NULL;
int err;
- /* Redirect dir can be !ovl_lower_positive && OVL_TYPE_MERGE */
- if (is_dir && ovl_dentry_get_redirect(dentry)) {
+ /* Redirect/origin dir can be !ovl_lower_positive && not clean */
+ if (is_dir && (ovl_dentry_get_redirect(dentry) ||
+ ovl_may_have_whiteouts(dentry))) {
opaquedir = ovl_check_empty_and_clear(dentry);
err = PTR_ERR(opaquedir);
if (IS_ERR(opaquedir))
@@ -945,7 +951,8 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
old_cred = ovl_override_creds(old->d_sb);
- if (overwrite && new_is_dir && ovl_type_merge_or_lower(new)) {
+ if (overwrite && new_is_dir && (ovl_type_merge_or_lower(new) ||
+ ovl_may_have_whiteouts(new))) {
opaquedir = ovl_check_empty_and_clear(new);
err = PTR_ERR(opaquedir);
if (IS_ERR(opaquedir)) {