--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2014, Intel Corporation.
+ *
+ * Copyright 2015 Cray Inc, all rights reserved.
+ * Author: Ben Evans.
+ *
+ * Define ost_id associated functions
+ */
+
+#ifndef _UAPI_LUSTRE_OSTID_H_
+#define _UAPI_LUSTRE_OSTID_H_
+
+#include <linux/errno.h>
+/*
+ * This is due to us being out of kernel and the way the OpenSFS branch
+ * handles CFLAGS.
+ */
+#ifdef __KERNEL__
+#include <uapi/linux/lustre/lustre_fid.h>
+#else
+#include <linux/lustre/lustre_fid.h>
+#endif
+
+static inline __u64 lmm_oi_id(const struct ost_id *oi)
+{
+ return oi->oi.oi_id;
+}
+
+static inline __u64 lmm_oi_seq(const struct ost_id *oi)
+{
+ return oi->oi.oi_seq;
+}
+
+static inline void lmm_oi_set_seq(struct ost_id *oi, __u64 seq)
+{
+ oi->oi.oi_seq = seq;
+}
+
+static inline void lmm_oi_set_id(struct ost_id *oi, __u64 oid)
+{
+ oi->oi.oi_id = oid;
+}
+
+static inline void lmm_oi_le_to_cpu(struct ost_id *dst_oi,
+ const struct ost_id *src_oi)
+{
+ dst_oi->oi.oi_id = __le64_to_cpu(src_oi->oi.oi_id);
+ dst_oi->oi.oi_seq = __le64_to_cpu(src_oi->oi.oi_seq);
+}
+
+static inline void lmm_oi_cpu_to_le(struct ost_id *dst_oi,
+ const struct ost_id *src_oi)
+{
+ dst_oi->oi.oi_id = __cpu_to_le64(src_oi->oi.oi_id);
+ dst_oi->oi.oi_seq = __cpu_to_le64(src_oi->oi.oi_seq);
+}
+
+/* extract OST sequence (group) from a wire ost_id (id/seq) pair */
+static inline __u64 ostid_seq(const struct ost_id *ostid)
+{
+ if (fid_seq_is_mdt0(ostid->oi.oi_seq))
+ return FID_SEQ_OST_MDT0;
+
+ if (fid_seq_is_default(ostid->oi.oi_seq))
+ return FID_SEQ_LOV_DEFAULT;
+
+ if (fid_is_idif(&ostid->oi_fid))
+ return FID_SEQ_OST_MDT0;
+
+ return fid_seq(&ostid->oi_fid);
+}
+
+/* extract OST objid from a wire ost_id (id/seq) pair */
+static inline __u64 ostid_id(const struct ost_id *ostid)
+{
+ if (fid_seq_is_mdt0(ostid->oi.oi_seq))
+ return ostid->oi.oi_id & IDIF_OID_MASK;
+
+ if (fid_seq_is_default(ostid->oi.oi_seq))
+ return ostid->oi.oi_id;
+
+ if (fid_is_idif(&ostid->oi_fid))
+ return fid_idif_id(fid_seq(&ostid->oi_fid),
+ fid_oid(&ostid->oi_fid), 0);
+
+ return fid_oid(&ostid->oi_fid);
+}
+
+static inline void ostid_set_seq(struct ost_id *oi, __u64 seq)
+{
+ if (fid_seq_is_mdt0(seq) || fid_seq_is_default(seq)) {
+ oi->oi.oi_seq = seq;
+ } else {
+ oi->oi_fid.f_seq = seq;
+ /*
+ * Note: if f_oid + f_ver is zero, we need init it
+ * to be 1, otherwise, ostid_seq will treat this
+ * as old ostid (oi_seq == 0)
+ */
+ if (!oi->oi_fid.f_oid && !oi->oi_fid.f_ver)
+ oi->oi_fid.f_oid = LUSTRE_FID_INIT_OID;
+ }
+}
+
+static inline void ostid_set_seq_mdt0(struct ost_id *oi)
+{
+ ostid_set_seq(oi, FID_SEQ_OST_MDT0);
+}
+
+static inline void ostid_set_seq_echo(struct ost_id *oi)
+{
+ ostid_set_seq(oi, FID_SEQ_ECHO);
+}
+
+static inline void ostid_set_seq_llog(struct ost_id *oi)
+{
+ ostid_set_seq(oi, FID_SEQ_LLOG);
+}
+
+static inline void ostid_cpu_to_le(const struct ost_id *src_oi,
+ struct ost_id *dst_oi)
+{
+ if (fid_seq_is_mdt0(src_oi->oi.oi_seq)) {
+ dst_oi->oi.oi_id = __cpu_to_le64(src_oi->oi.oi_id);
+ dst_oi->oi.oi_seq = __cpu_to_le64(src_oi->oi.oi_seq);
+ } else {
+ fid_cpu_to_le(&dst_oi->oi_fid, &src_oi->oi_fid);
+ }
+}
+
+static inline void ostid_le_to_cpu(const struct ost_id *src_oi,
+ struct ost_id *dst_oi)
+{
+ if (fid_seq_is_mdt0(src_oi->oi.oi_seq)) {
+ dst_oi->oi.oi_id = __le64_to_cpu(src_oi->oi.oi_id);
+ dst_oi->oi.oi_seq = __le64_to_cpu(src_oi->oi.oi_seq);
+ } else {
+ fid_le_to_cpu(&dst_oi->oi_fid, &src_oi->oi_fid);
+ }
+}
+
+/**
+ * Sigh, because pre-2.4 uses
+ * struct lov_mds_md_v1 {
+ * ........
+ * __u64 lmm_object_id;
+ * __u64 lmm_object_seq;
+ * ......
+ * }
+ * to identify the LOV(MDT) object, and lmm_object_seq will
+ * be normal_fid, which make it hard to combine these conversion
+ * to ostid_to FID. so we will do lmm_oi/fid conversion separately
+ *
+ * We can tell the lmm_oi by this way,
+ * 1.8: lmm_object_id = {inode}, lmm_object_gr = 0
+ * 2.1: lmm_object_id = {oid < 128k}, lmm_object_seq = FID_SEQ_NORMAL
+ * 2.4: lmm_oi.f_seq = FID_SEQ_NORMAL, lmm_oi.f_oid = {oid < 128k},
+ * lmm_oi.f_ver = 0
+ *
+ * But currently lmm_oi/lsm_oi does not have any "real" usages,
+ * except for printing some information, and the user can always
+ * get the real FID from LMA, besides this multiple case check might
+ * make swab more complicate. So we will keep using id/seq for lmm_oi.
+ */
+
+static inline void fid_to_lmm_oi(const struct lu_fid *fid,
+ struct ost_id *oi)
+{
+ oi->oi.oi_id = fid_oid(fid);
+ oi->oi.oi_seq = fid_seq(fid);
+}
+
+/**
+ * Unpack an OST object id/seq (group) into a FID. This is needed for
+ * converting all obdo, lmm, lsm, etc. 64-bit id/seq pairs into proper
+ * FIDs. Note that if an id/seq is already in FID/IDIF format it will
+ * be passed through unchanged. Only legacy OST objects in "group 0"
+ * will be mapped into the IDIF namespace so that they can fit into the
+ * struct lu_fid fields without loss.
+ */
+static inline int ostid_to_fid(struct lu_fid *fid, const struct ost_id *ostid,
+ __u32 ost_idx)
+{
+ __u64 seq = ostid_seq(ostid);
+
+ if (ost_idx > 0xffff)
+ return -EBADF;
+
+ if (fid_seq_is_mdt0(seq)) {
+ __u64 oid = ostid_id(ostid);
+
+ /* This is a "legacy" (old 1.x/2.early) OST object in "group 0"
+ * that we map into the IDIF namespace. It allows up to 2^48
+ * objects per OST, as this is the object namespace that has
+ * been in production for years. This can handle create rates
+ * of 1M objects/s/OST for 9 years, or combinations thereof.
+ */
+ if (oid >= IDIF_MAX_OID)
+ return -EBADF;
+
+ fid->f_seq = fid_idif_seq(oid, ost_idx);
+ /* truncate to 32 bits by assignment */
+ fid->f_oid = oid;
+ /* in theory, not currently used */
+ fid->f_ver = oid >> 48;
+ } else if (!fid_seq_is_default(seq)) {
+ /* This is either an IDIF object, which identifies objects
+ * across all OSTs, or a regular FID. The IDIF namespace
+ * maps legacy OST objects into the FID namespace. In both
+ * cases, we just pass the FID through, no conversion needed.
+ */
+ if (ostid->oi_fid.f_ver)
+ return -EBADF;
+
+ *fid = ostid->oi_fid;
+ }
+
+ return 0;
+}
+#endif /* _UAPI_LUSTRE_OSTID_H_ */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff