ovl: Ensure upper filesystem supports d_type

In some instances xfs has been created with ftype=0 and there if a file
on lower fs is removed, overlay leaves a whiteout in upper fs but that
whiteout does not get filtered out and is visible to overlayfs users.

And reason it does not get filtered out because upper filesystem does
not report file type of whiteout as DT_CHR during iterate_dir().

So it seems to be a requirement that upper filesystem support d_type for
overlayfs to work properly. Do this check during mount and fail if d_type
is not supported.

Suggested-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 99b4168c36ffb70bb37f81210ca1ce69883ae337..6a7090f4a4413010545bd808484b9a4cbb705c07 100644 (file)
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -166,6 +166,7 @@ extern const struct file_operations ovl_dir_operations;
 int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
 void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
 void ovl_cache_free(struct list_head *list);
+int ovl_check_d_type_supported(struct path *realpath);
 
 /* inode.c */
 int ovl_setattr(struct dentry *dentry, struct iattr *attr);

diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index fdaf28f75e12acf1f4dba023c31017c81747744b..18d0a16252209cda0411dd10e1e0371cfed06b57 100644 (file)
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -43,6 +43,7 @@ struct ovl_readdir_data {
        struct ovl_cache_entry *first_maybe_whiteout;
        int count;
        int err;
+       bool d_type_supported;
 };
 
 struct ovl_dir_file {
@@ -577,3 +578,39 @@ void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list)
        }
        inode_unlock(upper->d_inode);
 }
+
+static int ovl_check_d_type(struct dir_context *ctx, const char *name,
+                         int namelen, loff_t offset, u64 ino,
+                         unsigned int d_type)
+{
+       struct ovl_readdir_data *rdd =
+               container_of(ctx, struct ovl_readdir_data, ctx);
+
+       /* Even if d_type is not supported, DT_DIR is returned for . and .. */
+       if (!strncmp(name, ".", namelen) || !strncmp(name, "..", namelen))
+               return 0;
+
+       if (d_type != DT_UNKNOWN)
+               rdd->d_type_supported = true;
+
+       return 0;
+}
+
+/*
+ * Returns 1 if d_type is supported, 0 not supported/unknown. Negative values
+ * if error is encountered.
+ */
+int ovl_check_d_type_supported(struct path *realpath)
+{
+       int err;
+       struct ovl_readdir_data rdd = {
+               .ctx.actor = ovl_check_d_type,
+               .d_type_supported = false,
+       };
+
+       err = ovl_dir_read(realpath, &rdd);
+       if (err)
+               return err;
+
+       return rdd.d_type_supported;
+}

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 6b0111ae2ceb3513b15db06231e521fd28d11028..ef64984c9bbcec1f765ed0601dbfb9082bc44f42 100644 (file)
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1029,6 +1029,21 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
                        sb->s_flags |= MS_RDONLY;
                        ufs->workdir = NULL;
                }
+
+               /*
+                * Upper should support d_type, else whiteouts are visible.
+                * Given workdir and upper are on same fs, we can do
+                * iterate_dir() on workdir.
+                */
+               err = ovl_check_d_type_supported(&workpath);
+               if (err < 0)
+                       goto out_put_workdir;
+
+               if (!err) {
+                       pr_err("overlayfs: upper fs needs to support d_type.\n");
+                       err = -EINVAL;
+                       goto out_put_workdir;
+               }
        }
 
        err = -ENOMEM;