--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * lustre/include/linux/lustre_req_layout.h
+ * Lustre Metadata Target (mdt) request handler
+ *
+ * Copyright (c) 2006 Cluster File Systems, Inc.
+ * Author: Nikita Danilov <nikita@clusterfs.com>
+ *
+ * This file is part of the Lustre file system, http://www.lustre.org
+ * Lustre is a trademark of Cluster File Systems, Inc.
+ *
+ * You may have signed or agreed to another license before downloading
+ * this software. If so, you are bound by the terms and conditions
+ * of that agreement, and the following does not apply to you. See the
+ * LICENSE file included with this distribution for more information.
+ *
+ * If you did not agree to a different license, then this copy of Lustre
+ * is open source software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In either case, Lustre is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * license text for more details.
+ */
+
+#ifndef _LINUX_LUSTRE_REQ_LAYOUT_H__
+#define _LINUX_LUSTRE_REQ_LAYOUT_H__
+
+/* struct ptlrpc_request, lustre_msg* */
+#include <linux/lustre_net.h>
+
+struct req_msg_field;
+struct req_format;
+struct req_capsule;
+
+struct ptlrpc_request;
+
+enum req_location {
+ RCL_CLIENT,
+ RCL_SERVER,
+ RCL_NR
+};
+
+struct req_capsule {
+ struct ptlrpc_request *rc_req;
+ const struct req_format *rc_fmt[RCL_NR];
+ __u32 rc_swabbed;
+ enum req_location rc_loc;
+};
+
+void req_capsule_init(struct req_capsule *pill,
+ struct ptlrpc_request *req,
+ enum req_location location);
+void req_capsule_fini(struct req_capsule *pill);
+
+void req_capsule_client_init(struct req_capsule *pill,
+ const struct req_format *fmt);
+void req_capsule_server_init(struct req_capsule *pill,
+ const struct req_format *fmt);
+int req_capsule_start(struct req_capsule *pill,
+ const struct req_format *fmt, int *area);
+
+const void *req_capsule_client_get(const struct req_capsule *pill,
+ const struct req_msg_field *field);
+void *req_capsule_server_get(const struct req_capsule *pill,
+ const struct req_msg_field *field);
+
+int req_layout_init(void);
+void req_layout_fini(void);
+
+extern const struct req_format RQF_MDS_GETSTATUS;
+extern const struct req_format RQF_MDS_STATFS;
+extern const struct req_format RQF_MDS_GETATTR;
+extern const struct req_format RQF_MDS_GETATTR_NAME;
+extern const struct req_format RQF_MDS_REINT_CREATE;
+
+extern const struct req_msg_field RMF_MDT_BODY;
+extern const struct req_msg_field RMF_OBD_STATFS;
+extern const struct req_msg_field RMF_NAME;
+extern const struct req_msg_field RMF_REC_CREATE;
+
+
+#endif /* _LINUX_LUSTRE_REQ_LAYOUT_H__ */
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * lustre/ptlrpc/layout.c
+ * Lustre Metadata Target (mdt) request handler
+ *
+ * Copyright (c) 2006 Cluster File Systems, Inc.
+ * Author: Nikita Danilov <nikita@clusterfs.com>
+ *
+ * This file is part of the Lustre file system, http://www.lustre.org
+ * Lustre is a trademark of Cluster File Systems, Inc.
+ *
+ * You may have signed or agreed to another license before downloading
+ * this software. If so, you are bound by the terms and conditions
+ * of that agreement, and the following does not apply to you. See the
+ * LICENSE file included with this distribution for more information.
+ *
+ * If you did not agree to a different license, then this copy of Lustre
+ * is open source software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In either case, Lustre is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * license text for more details.
+ */
+
+#ifndef EXPORT_SYMTAB
+# define EXPORT_SYMTAB
+#endif
+#define DEBUG_SUBSYSTEM S_RPC
+
+#ifdef __KERNEL__
+#include <linux/module.h>
+#else
+# include <liblustre.h>
+#endif
+
+/* LUSTRE_VERSION_CODE */
+#include <linux/lustre_ver.h>
+
+#include <linux/obd_support.h>
+/* lustre_swab_mdt_body */
+#include <linux/lustre_idl.h>
+/* obd2cli_tgt() (required by DEBUG_REQ()) */
+#include <linux/obd.h>
+
+/* struct ptlrpc_request, lustre_msg* */
+#include <linux/lustre_req_layout.h>
+
+static const struct req_msg_field *empty[] = {}; /* none */
+
+static const struct req_msg_field *mdt_body_only[] = {
+ &RMF_MDT_BODY
+};
+
+static const struct req_msg_field *mds_statfs_server[] = {
+ &RMF_OBD_STATFS
+};
+
+static const struct req_msg_field *mds_getattr_name_client[] = {
+ &RMF_MDT_BODY,
+ &RMF_NAME
+};
+
+static const struct req_msg_field *mds_reint_create_client[] = {
+ &RMF_REC_CREATE,
+ &RMF_NAME
+};
+
+static const struct req_format *req_formats[] = {
+ &RQF_MDS_GETSTATUS,
+ &RQF_MDS_STATFS,
+ &RQF_MDS_GETATTR,
+ &RQF_MDS_GETATTR_NAME,
+ &RQF_MDS_REINT_CREATE
+};
+
+struct req_msg_field {
+ __u32 rmf_flags;
+ const char *rmf_name;
+ int rmf_size;
+ void (*rmf_swabber)(void *);
+ int rmf_offset[ARRAY_SIZE(req_formats)][RCL_NR];
+};
+
+enum rmf_flags {
+ RMF_F_STRING = 1 << 0
+};
+
+struct req_capsule;
+
+/*
+ * Request fields.
+ */
+#define DEFINE_MSGF(name, flags, size, swabber) { \
+ .rmf_name = (name), \
+ .rmf_flags = (flags), \
+ .rmf_size = (size), \
+ .rmf_swabber = (void (*)(void*))(swabber) \
+}
+
+const struct req_msg_field RMF_MDT_BODY =
+ DEFINE_MSGF("mdt_body", 0,
+ sizeof(struct mdt_body), lustre_swab_mdt_body);
+EXPORT_SYMBOL(RMF_MDT_BODY);
+
+const struct req_msg_field RMF_OBD_STATFS =
+ DEFINE_MSGF("obd_statfs", 0,
+ sizeof(struct obd_statfs), lustre_swab_obd_statfs);
+EXPORT_SYMBOL(RMF_OBD_STATFS);
+
+const struct req_msg_field RMF_NAME =
+ DEFINE_MSGF("name", RMF_F_STRING, 0, NULL);
+EXPORT_SYMBOL(RMF_NAME);
+
+const struct req_msg_field RMF_REC_CREATE =
+ DEFINE_MSGF("rec_create", 0,
+ sizeof(struct mdt_rec_create), lustre_swab_mdt_rec_create);
+EXPORT_SYMBOL(RMF_REC_CREATE);
+
+/*
+ * Request formats.
+ */
+
+struct req_format {
+ const char *rf_name;
+ int rf_idx;
+ struct {
+ int nr;
+ const struct req_msg_field **d;
+ } rf_fields[RCL_NR];
+};
+
+#define DEFINE_REQ_FMT(name, client, client_nr, server, server_nr) { \
+ .rf_name = name, \
+ .rf_fields = { \
+ [RCL_CLIENT] = { \
+ .nr = client_nr, \
+ .d = client \
+ }, \
+ [RCL_SERVER] = { \
+ .nr = server_nr, \
+ .d = server \
+ } \
+ } \
+}
+
+#define DEFINE_REQ_FMT0(name, client, server) \
+DEFINE_REQ_FMT(name, client, ARRAY_SIZE(client), server, ARRAY_SIZE(server))
+
+const struct req_format RQF_MDS_GETSTATUS =
+ DEFINE_REQ_FMT0("MDS_GETSTATUS", empty, mdt_body_only);
+EXPORT_SYMBOL(RQF_MDS_GETSTATUS);
+
+const struct req_format RQF_MDS_STATFS =
+ DEFINE_REQ_FMT0("MDS_STATFS", empty, mds_statfs_server);
+EXPORT_SYMBOL(RQF_MDS_STATFS);
+
+const struct req_format RQF_MDS_GETATTR =
+ DEFINE_REQ_FMT0("MDS_GETATTR", mdt_body_only, mdt_body_only);
+EXPORT_SYMBOL(RQF_MDS_GETATTR);
+
+const struct req_format RQF_MDS_GETATTR_NAME =
+ DEFINE_REQ_FMT0("MDS_GETATTR_NAME",
+ mds_getattr_name_client, mdt_body_only);
+EXPORT_SYMBOL(RQF_MDS_GETATTR_NAME);
+
+const struct req_format RQF_MDS_REINT_CREATE =
+ DEFINE_REQ_FMT0("MDS_REINT_CREATE",
+ mds_reint_create_client, mdt_body_only);
+EXPORT_SYMBOL(RQF_MDS_REINT_CREATE);
+
+int req_layout_init(void)
+{
+ int i;
+ int j;
+ int k;
+
+ for (i = 0; i < ARRAY_SIZE(req_formats); ++i) {
+ struct req_format *rf;
+
+ rf = (struct req_format *)req_formats[i];
+ rf->rf_idx = i;
+ for (j = 0; j < RCL_NR; ++j) {
+ for (k = 0; k < rf->rf_fields[j].nr; ++k) {
+ struct req_msg_field *field;
+
+ field = (typeof(field))rf->rf_fields[j].d[k];
+ LASSERT(field->rmf_offset[i][j] == 0);
+ /*
+ * k + 1 to detect unused format/field
+ * combinations.
+ */
+ field->rmf_offset[i][j] = k + 1;
+ }
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(req_layout_init);
+
+void req_layout_fini(void)
+{
+}
+EXPORT_SYMBOL(req_layout_fini);
+
+void req_capsule_init(struct req_capsule *pill,
+ struct ptlrpc_request *req, enum req_location location)
+{
+ LASSERT(location == RCL_SERVER || location == RCL_CLIENT);
+
+ memset(pill, 0, sizeof *pill);
+ pill->rc_req = req;
+ pill->rc_loc = location;
+}
+EXPORT_SYMBOL(req_capsule_init);
+
+void req_capsule_fini(struct req_capsule *pill)
+{
+}
+EXPORT_SYMBOL(req_capsule_fini);
+
+static int __req_format_is_sane(const struct req_format *fmt)
+{
+ return
+ 0 <= fmt->rf_idx && fmt->rf_idx < ARRAY_SIZE(req_formats) &&
+ req_formats[fmt->rf_idx] == fmt;
+}
+
+static void __req_capsule_init(struct req_capsule *pill,
+ const struct req_format *fmt,
+ enum req_location loc)
+{
+ LASSERT(0 <= loc && loc < ARRAY_SIZE(pill->rc_fmt));
+ LASSERT(pill->rc_fmt[loc] == NULL);
+ LASSERT(ergo(loc != pill->rc_loc, pill->rc_swabbed == 0));
+ LASSERT(__req_format_is_sane(fmt));
+
+ pill->rc_fmt[loc] = fmt;
+}
+
+void req_capsule_server_init(struct req_capsule *pill,
+ const struct req_format *fmt)
+{
+ __req_capsule_init(pill, fmt, RCL_SERVER);
+}
+EXPORT_SYMBOL(req_capsule_server_init);
+
+void req_capsule_client_init(struct req_capsule *pill,
+ const struct req_format *fmt)
+{
+ __req_capsule_init(pill, fmt, RCL_CLIENT);
+}
+EXPORT_SYMBOL(req_capsule_client_init);
+
+int req_capsule_start(struct req_capsule *pill,
+ const struct req_format *fmt, int *area)
+{
+ int i;
+ int nr;
+ int result;
+
+ LASSERT(pill->rc_loc == RCL_SERVER);
+
+ nr = fmt->rf_fields[RCL_SERVER].nr;
+ for (i = 0; i < nr; ++i)
+ area[i] = fmt->rf_fields[RCL_SERVER].d[i]->rmf_size;
+ req_capsule_server_init(pill, fmt);
+ result = lustre_pack_reply(pill->rc_req, nr, area, NULL);
+ if (result != 0) {
+ DEBUG_REQ(D_ERROR, pill->rc_req,
+ "Failed to pack %d fields in format `%s': ",
+ nr, fmt->rf_name);
+ }
+ return result;
+}
+EXPORT_SYMBOL(req_capsule_start);
+
+static void *__req_capsule_get(const struct req_capsule *pill,
+ const struct req_msg_field *field,
+ enum req_location loc)
+{
+ const struct req_format *fmt;
+ const struct ptlrpc_request *req;
+ struct lustre_msg *msg;
+ void *value;
+ int offset;
+
+ void *(*getter)(struct lustre_msg *m, int n, int minlen);
+
+ static const char *rcl_names[RCL_NR] = {
+ [RCL_CLIENT] = "client",
+ [RCL_SERVER] = "server"
+ };
+
+ LASSERT(0 <= loc && loc < ARRAY_SIZE(pill->rc_fmt));
+ CLASSERT(ARRAY_SIZE(pill->rc_fmt) == ARRAY_SIZE(field->rmf_offset[0]));
+
+ fmt = pill->rc_fmt[loc];
+ LASSERT(fmt != NULL);
+ LASSERT(__req_format_is_sane(fmt));
+
+ offset = field->rmf_offset[fmt->rf_idx][loc];
+ LASSERT(offset > 0);
+ -- offset;
+ LASSERT(0 <= offset && offset < (sizeof(pill->rc_swabbed) << 3));
+
+ req = pill->rc_req;
+ msg = loc == RCL_CLIENT ? req->rq_reqmsg : req->rq_repmsg;
+
+ getter = (field->rmf_flags & RMF_F_STRING) ?
+ (typeof(getter))lustre_msg_string : lustre_msg_buf;
+
+ value = getter(msg, offset, field->rmf_size);
+
+ if (!(pill->rc_swabbed & (1 << offset)) && loc != pill->rc_loc &&
+ field->rmf_swabber != NULL && value != NULL &&
+ lustre_msg_swabbed(msg))
+ field->rmf_swabber(value);
+ if (value == NULL)
+ DEBUG_REQ(D_ERROR, pill->rc_req,
+ "Wrong buffer for field `%s' (%d) in format `%s': "
+ "%d < %d (%s)\n",
+ field->rmf_name, offset, fmt->rf_name,
+ lustre_msg_buflen(msg, offset), field->rmf_size,
+ rcl_names[loc]);
+ return value;
+}
+
+const void *req_capsule_client_get(const struct req_capsule *pill,
+ const struct req_msg_field *field)
+{
+ return (const void *)__req_capsule_get(pill, field, RCL_CLIENT);
+}
+EXPORT_SYMBOL(req_capsule_client_get);
+
+void *req_capsule_server_get(const struct req_capsule *pill,
+ const struct req_msg_field *field)
+{
+ return __req_capsule_get(pill, field, RCL_SERVER);
+}
+EXPORT_SYMBOL(req_capsule_server_get);
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff