Implement vfs_ea_tdb

This is an option for file systems that do not implement xattrs: in
lockdir/eas.tdb an array of xatts per inode is stored.

It can not solve the problem that xattrs might reappear if a posix-level
process deletes a file and happens to re-create it under the same name. On file
systems with birthtime we might have a chance to detect this, but not with
standard posix. A future version might put relief on file systems that do have
xattrs but where these are severely limited in size/speed/whatever: We can put
a simple marker as a native xattr, but the xattrs proper are stored in the tdb.

Volker
(This used to be commit 2036b4c5ad677b8a477b34b0f076febab0abff5e)

4 files changed, 159 insertions, 0 deletions

diff --git a/source3/librpc/gen_ndr/ndr_xattr.c b/source3/librpc/gen_ndr/ndr_xattr.c
new file mode 100644
index 0000000000..29a31a12b2
--- /dev/null
+++ b/source3/librpc/gen_ndr/ndr_xattr.c
@@ -0,0 +1,102 @@
+/* parser auto-generated by pidl */
+
+#include "includes.h"
+#include "librpc/gen_ndr/ndr_xattr.h"
+
+_PUBLIC_ enum ndr_err_code ndr_push_tdb_xattr(struct ndr_push *ndr, int ndr_flags, const struct tdb_xattr *r)
+{
+	if (ndr_flags & NDR_SCALARS) {
+		NDR_CHECK(ndr_push_align(ndr, 4));
+		{
+			uint32_t _flags_save_string = ndr->flags;
+			ndr_set_flags(&ndr->flags, LIBNDR_FLAG_STR_UTF8|LIBNDR_FLAG_STR_NULLTERM);
+			NDR_CHECK(ndr_push_string(ndr, NDR_SCALARS, r->name));
+			ndr->flags = _flags_save_string;
+		}
+		NDR_CHECK(ndr_push_DATA_BLOB(ndr, NDR_SCALARS, r->value));
+	}
+	if (ndr_flags & NDR_BUFFERS) {
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ enum ndr_err_code ndr_pull_tdb_xattr(struct ndr_pull *ndr, int ndr_flags, struct tdb_xattr *r)
+{
+	if (ndr_flags & NDR_SCALARS) {
+		NDR_CHECK(ndr_pull_align(ndr, 4));
+		{
+			uint32_t _flags_save_string = ndr->flags;
+			ndr_set_flags(&ndr->flags, LIBNDR_FLAG_STR_UTF8|LIBNDR_FLAG_STR_NULLTERM);
+			NDR_CHECK(ndr_pull_string(ndr, NDR_SCALARS, &r->name));
+			ndr->flags = _flags_save_string;
+		}
+		NDR_CHECK(ndr_pull_DATA_BLOB(ndr, NDR_SCALARS, &r->value));
+	}
+	if (ndr_flags & NDR_BUFFERS) {
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ void ndr_print_tdb_xattr(struct ndr_print *ndr, const char *name, const struct tdb_xattr *r)
+{
+	ndr_print_struct(ndr, name, "tdb_xattr");
+	ndr->depth++;
+	ndr_print_string(ndr, "name", r->name);
+	ndr_print_DATA_BLOB(ndr, "value", r->value);
+	ndr->depth--;
+}
+
+_PUBLIC_ enum ndr_err_code ndr_push_tdb_xattrs(struct ndr_push *ndr, int ndr_flags, const struct tdb_xattrs *r)
+{
+	uint32_t cntr_xattrs_0;
+	if (ndr_flags & NDR_SCALARS) {
+		NDR_CHECK(ndr_push_align(ndr, 4));
+		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->num_xattrs));
+		for (cntr_xattrs_0 = 0; cntr_xattrs_0 < r->num_xattrs; cntr_xattrs_0++) {
+			NDR_CHECK(ndr_push_tdb_xattr(ndr, NDR_SCALARS, &r->xattrs[cntr_xattrs_0]));
+		}
+	}
+	if (ndr_flags & NDR_BUFFERS) {
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ enum ndr_err_code ndr_pull_tdb_xattrs(struct ndr_pull *ndr, int ndr_flags, struct tdb_xattrs *r)
+{
+	uint32_t cntr_xattrs_0;
+	TALLOC_CTX *_mem_save_xattrs_0;
+	if (ndr_flags & NDR_SCALARS) {
+		NDR_CHECK(ndr_pull_align(ndr, 4));
+		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->num_xattrs));
+		NDR_PULL_ALLOC_N(ndr, r->xattrs, r->num_xattrs);
+		_mem_save_xattrs_0 = NDR_PULL_GET_MEM_CTX(ndr);
+		NDR_PULL_SET_MEM_CTX(ndr, r->xattrs, 0);
+		for (cntr_xattrs_0 = 0; cntr_xattrs_0 < r->num_xattrs; cntr_xattrs_0++) {
+			NDR_CHECK(ndr_pull_tdb_xattr(ndr, NDR_SCALARS, &r->xattrs[cntr_xattrs_0]));
+		}
+		NDR_PULL_SET_MEM_CTX(ndr, _mem_save_xattrs_0, 0);
+	}
+	if (ndr_flags & NDR_BUFFERS) {
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ void ndr_print_tdb_xattrs(struct ndr_print *ndr, const char *name, const struct tdb_xattrs *r)
+{
+	uint32_t cntr_xattrs_0;
+	ndr_print_struct(ndr, name, "tdb_xattrs");
+	ndr->depth++;
+	ndr_print_uint32(ndr, "num_xattrs", r->num_xattrs);
+	ndr->print(ndr, "%s: ARRAY(%d)", "xattrs", r->num_xattrs);
+	ndr->depth++;
+	for (cntr_xattrs_0=0;cntr_xattrs_0<r->num_xattrs;cntr_xattrs_0++) {
+		char *idx_0=NULL;
+		asprintf(&idx_0, "[%d]", cntr_xattrs_0);
+		if (idx_0) {
+			ndr_print_tdb_xattr(ndr, "xattrs", &r->xattrs[cntr_xattrs_0]);
+			free(idx_0);
+		}
+	}
+	ndr->depth--;
+	ndr->depth--;
+}
diff --git a/source3/librpc/gen_ndr/ndr_xattr.h b/source3/librpc/gen_ndr/ndr_xattr.h
new file mode 100644
index 0000000000..a18477f347
--- /dev/null
+++ b/source3/librpc/gen_ndr/ndr_xattr.h
@@ -0,0 +1,16 @@
+/* header auto-generated by pidl */
+
+#include "librpc/ndr/libndr.h"
+#include "librpc/gen_ndr/xattr.h"
+
+#ifndef _HEADER_NDR_xattr
+#define _HEADER_NDR_xattr
+
+#define NDR_XATTR_CALL_COUNT (0)
+enum ndr_err_code ndr_push_tdb_xattr(struct ndr_push *ndr, int ndr_flags, const struct tdb_xattr *r);
+enum ndr_err_code ndr_pull_tdb_xattr(struct ndr_pull *ndr, int ndr_flags, struct tdb_xattr *r);
+void ndr_print_tdb_xattr(struct ndr_print *ndr, const char *name, const struct tdb_xattr *r);
+enum ndr_err_code ndr_push_tdb_xattrs(struct ndr_push *ndr, int ndr_flags, const struct tdb_xattrs *r);
+enum ndr_err_code ndr_pull_tdb_xattrs(struct ndr_pull *ndr, int ndr_flags, struct tdb_xattrs *r);
+void ndr_print_tdb_xattrs(struct ndr_print *ndr, const char *name, const struct tdb_xattrs *r);
+#endif /* _HEADER_NDR_xattr */
diff --git a/source3/librpc/gen_ndr/xattr.h b/source3/librpc/gen_ndr/xattr.h
new file mode 100644
index 0000000000..ee30376be8
--- /dev/null
+++ b/source3/librpc/gen_ndr/xattr.h
@@ -0,0 +1,18 @@
+/* header auto-generated by pidl */
+
+#include <stdint.h>
+
+#ifndef _HEADER_xattr
+#define _HEADER_xattr
+
+struct tdb_xattr {
+	const char * name;/* [flag(LIBNDR_FLAG_STR_UTF8|LIBNDR_FLAG_STR_NULLTERM)] */
+	DATA_BLOB value;
+}/* [public] */;
+
+struct tdb_xattrs {
+	uint32_t num_xattrs;
+	struct tdb_xattr *xattrs;
+}/* [public] */;
+
+#endif /* _HEADER_xattr */
diff --git a/source3/librpc/idl/xattr.idl b/source3/librpc/idl/xattr.idl
new file mode 100644
index 0000000000..ec230a4efb
--- /dev/null
+++ b/source3/librpc/idl/xattr.idl
@@ -0,0 +1,23 @@
+#include "idl_types.h"
+
+/*
+   IDL structures for xattrs
+*/
+
+[
+  pointer_default(unique)
+]
+interface xattr
+{
+	/* xattrs for file systems that don't have any */
+
+	typedef [public] struct {
+		utf8string name;
+		DATA_BLOB value;
+	} tdb_xattr;
+
+	typedef [public] struct {
+		uint32 num_xattrs;
+		tdb_xattr xattrs[num_xattrs];
+	} tdb_xattrs;
+}