--- /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.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/lov/lov_pack.c
+ *
+ * (Un)packing of OST/MDS requests
+ *
+ * Author: Andreas Dilger <adilger@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LOV
+
+#include "../include/lustre_net.h"
+#include "../include/obd.h"
+#include "../include/obd_class.h"
+#include "../include/obd_support.h"
+#include "../include/lustre/lustre_user.h"
+
+#include "lov_internal.h"
+
+void lov_dump_lmm_common(int level, void *lmmp)
+{
+ struct lov_mds_md *lmm = lmmp;
+ struct ost_id oi;
+
+ lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
+ CDEBUG(level, "objid "DOSTID", magic 0x%08x, pattern %#x\n",
+ POSTID(&oi), le32_to_cpu(lmm->lmm_magic),
+ le32_to_cpu(lmm->lmm_pattern));
+ CDEBUG(level, "stripe_size %u, stripe_count %u, layout_gen %u\n",
+ le32_to_cpu(lmm->lmm_stripe_size),
+ le16_to_cpu(lmm->lmm_stripe_count),
+ le16_to_cpu(lmm->lmm_layout_gen));
+}
+
+static void lov_dump_lmm_objects(int level, struct lov_ost_data *lod,
+ int stripe_count)
+{
+ int i;
+
+ if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
+ CDEBUG(level, "bad stripe_count %u > max_stripe_count %u\n",
+ stripe_count, LOV_V1_INSANE_STRIPE_COUNT);
+ return;
+ }
+
+ for (i = 0; i < stripe_count; ++i, ++lod) {
+ struct ost_id oi;
+
+ ostid_le_to_cpu(&lod->l_ost_oi, &oi);
+ CDEBUG(level, "stripe %u idx %u subobj "DOSTID"\n", i,
+ le32_to_cpu(lod->l_ost_idx), POSTID(&oi));
+ }
+}
+
+void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
+{
+ lov_dump_lmm_common(level, lmm);
+ lov_dump_lmm_objects(level, lmm->lmm_objects,
+ le16_to_cpu(lmm->lmm_stripe_count));
+}
+
+void lov_dump_lmm_v3(int level, struct lov_mds_md_v3 *lmm)
+{
+ lov_dump_lmm_common(level, lmm);
+ CDEBUG(level, "pool_name "LOV_POOLNAMEF"\n", lmm->lmm_pool_name);
+ lov_dump_lmm_objects(level, lmm->lmm_objects,
+ le16_to_cpu(lmm->lmm_stripe_count));
+}
+
+void lov_dump_lmm(int level, void *lmm)
+{
+ int magic;
+
+ magic = le32_to_cpu(((struct lov_mds_md *)lmm)->lmm_magic);
+ switch (magic) {
+ case LOV_MAGIC_V1:
+ lov_dump_lmm_v1(level, (struct lov_mds_md_v1 *)lmm);
+ break;
+ case LOV_MAGIC_V3:
+ lov_dump_lmm_v3(level, (struct lov_mds_md_v3 *)lmm);
+ break;
+ default:
+ CDEBUG(level, "unrecognized lmm_magic %x, assuming %x\n",
+ magic, LOV_MAGIC_V1);
+ lov_dump_lmm_common(level, lmm);
+ break;
+ }
+}
+
+/* Pack LOV object metadata for disk storage. It is packed in LE byte
+ * order and is opaque to the networking layer.
+ *
+ * XXX In the future, this will be enhanced to get the EA size from the
+ * underlying OSC device(s) to get their EA sizes so we can stack
+ * LOVs properly. For now lov_mds_md_size() just assumes one u64
+ * per stripe.
+ */
+int lov_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
+ struct lov_stripe_md *lsm)
+{
+ struct obd_device *obd = class_exp2obd(exp);
+ struct lov_obd *lov = &obd->u.lov;
+ struct lov_mds_md_v1 *lmmv1;
+ struct lov_mds_md_v3 *lmmv3;
+ __u16 stripe_count;
+ struct lov_ost_data_v1 *lmm_objects;
+ int lmm_size, lmm_magic;
+ int i;
+ int cplen = 0;
+
+ if (lsm) {
+ lmm_magic = lsm->lsm_magic;
+ } else {
+ if (lmmp && *lmmp)
+ lmm_magic = le32_to_cpu((*lmmp)->lmm_magic);
+ else
+ /* lsm == NULL and lmmp == NULL */
+ lmm_magic = LOV_MAGIC;
+ }
+
+ if ((lmm_magic != LOV_MAGIC_V1) &&
+ (lmm_magic != LOV_MAGIC_V3)) {
+ CERROR("bad mem LOV MAGIC: 0x%08X != 0x%08X nor 0x%08X\n",
+ lmm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3);
+ return -EINVAL;
+
+ }
+
+ if (lsm) {
+ /* If we are just sizing the EA, limit the stripe count
+ * to the actual number of OSTs in this filesystem. */
+ if (!lmmp) {
+ stripe_count = lov_get_stripecnt(lov, lmm_magic,
+ lsm->lsm_stripe_count);
+ lsm->lsm_stripe_count = stripe_count;
+ } else if (!lsm_is_released(lsm)) {
+ stripe_count = lsm->lsm_stripe_count;
+ } else {
+ stripe_count = 0;
+ }
+ } else {
+ /* No need to allocate more than maximum supported stripes.
+ * Anyway, this is pretty inaccurate since ld_tgt_count now
+ * represents max index and we should rely on the actual number
+ * of OSTs instead */
+ stripe_count = lov_mds_md_max_stripe_count(
+ lov->lov_ocd.ocd_max_easize, lmm_magic);
+
+ if (stripe_count > lov->desc.ld_tgt_count)
+ stripe_count = lov->desc.ld_tgt_count;
+ }
+
+ /* XXX LOV STACKING call into osc for sizes */
+ lmm_size = lov_mds_md_size(stripe_count, lmm_magic);
+
+ if (!lmmp)
+ return lmm_size;
+
+ if (*lmmp && !lsm) {
+ stripe_count = le16_to_cpu((*lmmp)->lmm_stripe_count);
+ lmm_size = lov_mds_md_size(stripe_count, lmm_magic);
+ OBD_FREE_LARGE(*lmmp, lmm_size);
+ *lmmp = NULL;
+ return 0;
+ }
+
+ if (!*lmmp) {
+ OBD_ALLOC_LARGE(*lmmp, lmm_size);
+ if (!*lmmp)
+ return -ENOMEM;
+ }
+
+ CDEBUG(D_INFO, "lov_packmd: LOV_MAGIC 0x%08X, lmm_size = %d \n",
+ lmm_magic, lmm_size);
+
+ lmmv1 = *lmmp;
+ lmmv3 = (struct lov_mds_md_v3 *)*lmmp;
+ if (lmm_magic == LOV_MAGIC_V3)
+ lmmv3->lmm_magic = cpu_to_le32(LOV_MAGIC_V3);
+ else
+ lmmv1->lmm_magic = cpu_to_le32(LOV_MAGIC_V1);
+
+ if (!lsm)
+ return lmm_size;
+
+ /* lmmv1 and lmmv3 point to the same struct and have the
+ * same first fields
+ */
+ lmm_oi_cpu_to_le(&lmmv1->lmm_oi, &lsm->lsm_oi);
+ lmmv1->lmm_stripe_size = cpu_to_le32(lsm->lsm_stripe_size);
+ lmmv1->lmm_stripe_count = cpu_to_le16(stripe_count);
+ lmmv1->lmm_pattern = cpu_to_le32(lsm->lsm_pattern);
+ lmmv1->lmm_layout_gen = cpu_to_le16(lsm->lsm_layout_gen);
+ if (lsm->lsm_magic == LOV_MAGIC_V3) {
+ cplen = strlcpy(lmmv3->lmm_pool_name, lsm->lsm_pool_name,
+ sizeof(lmmv3->lmm_pool_name));
+ if (cplen >= sizeof(lmmv3->lmm_pool_name))
+ return -E2BIG;
+ lmm_objects = lmmv3->lmm_objects;
+ } else {
+ lmm_objects = lmmv1->lmm_objects;
+ }
+
+ for (i = 0; i < stripe_count; i++) {
+ struct lov_oinfo *loi = lsm->lsm_oinfo[i];
+ /* XXX LOV STACKING call down to osc_packmd() to do packing */
+ LASSERTF(ostid_id(&loi->loi_oi) != 0, "lmm_oi "DOSTID
+ " stripe %u/%u idx %u\n", POSTID(&lmmv1->lmm_oi),
+ i, stripe_count, loi->loi_ost_idx);
+ ostid_cpu_to_le(&loi->loi_oi, &lmm_objects[i].l_ost_oi);
+ lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
+ lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
+ }
+
+ return lmm_size;
+}
+
+/* Find the max stripecount we should use */
+__u16 lov_get_stripecnt(struct lov_obd *lov, __u32 magic, __u16 stripe_count)
+{
+ __u32 max_stripes = LOV_MAX_STRIPE_COUNT_OLD;
+
+ if (!stripe_count)
+ stripe_count = lov->desc.ld_default_stripe_count;
+ if (stripe_count > lov->desc.ld_active_tgt_count)
+ stripe_count = lov->desc.ld_active_tgt_count;
+ if (!stripe_count)
+ stripe_count = 1;
+
+ /* stripe count is based on whether ldiskfs can handle
+ * larger EA sizes */
+ if (lov->lov_ocd.ocd_connect_flags & OBD_CONNECT_MAX_EASIZE &&
+ lov->lov_ocd.ocd_max_easize)
+ max_stripes = lov_mds_md_max_stripe_count(
+ lov->lov_ocd.ocd_max_easize, magic);
+
+ if (stripe_count > max_stripes)
+ stripe_count = max_stripes;
+
+ return stripe_count;
+}
+
+
+static int lov_verify_lmm(void *lmm, int lmm_bytes, __u16 *stripe_count)
+{
+ int rc;
+
+ if (lsm_op_find(le32_to_cpu(*(__u32 *)lmm)) == NULL) {
+ char *buffer;
+ int sz;
+
+ CERROR("bad disk LOV MAGIC: 0x%08X; dumping LMM (size=%d):\n",
+ le32_to_cpu(*(__u32 *)lmm), lmm_bytes);
+ sz = lmm_bytes * 2 + 1;
+ OBD_ALLOC_LARGE(buffer, sz);
+ if (buffer != NULL) {
+ int i;
+
+ for (i = 0; i < lmm_bytes; i++)
+ sprintf(buffer+2*i, "%.2X", ((char *)lmm)[i]);
+ buffer[sz - 1] = '\0';
+ CERROR("%s\n", buffer);
+ OBD_FREE_LARGE(buffer, sz);
+ }
+ return -EINVAL;
+ }
+ rc = lsm_op_find(le32_to_cpu(*(__u32 *)lmm))->lsm_lmm_verify(lmm,
+ lmm_bytes, stripe_count);
+ return rc;
+}
+
+int lov_alloc_memmd(struct lov_stripe_md **lsmp, __u16 stripe_count,
+ int pattern, int magic)
+{
+ int i, lsm_size;
+
+ CDEBUG(D_INFO, "alloc lsm, stripe_count %d\n", stripe_count);
+
+ *lsmp = lsm_alloc_plain(stripe_count, &lsm_size);
+ if (!*lsmp) {
+ CERROR("can't allocate lsmp stripe_count %d\n", stripe_count);
+ return -ENOMEM;
+ }
+
+ atomic_set(&(*lsmp)->lsm_refc, 1);
+ spin_lock_init(&(*lsmp)->lsm_lock);
+ (*lsmp)->lsm_magic = magic;
+ (*lsmp)->lsm_stripe_count = stripe_count;
+ (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES * stripe_count;
+ (*lsmp)->lsm_pattern = pattern;
+ (*lsmp)->lsm_pool_name[0] = '\0';
+ (*lsmp)->lsm_layout_gen = 0;
+ if (stripe_count > 0)
+ (*lsmp)->lsm_oinfo[0]->loi_ost_idx = ~0;
+
+ for (i = 0; i < stripe_count; i++)
+ loi_init((*lsmp)->lsm_oinfo[i]);
+
+ return lsm_size;
+}
+
+int lov_free_memmd(struct lov_stripe_md **lsmp)
+{
+ struct lov_stripe_md *lsm = *lsmp;
+ int refc;
+
+ *lsmp = NULL;
+ LASSERT(atomic_read(&lsm->lsm_refc) > 0);
+ refc = atomic_dec_return(&lsm->lsm_refc);
+ if (refc == 0) {
+ LASSERT(lsm_op_find(lsm->lsm_magic) != NULL);
+ lsm_op_find(lsm->lsm_magic)->lsm_free(lsm);
+ }
+ return refc;
+}
+
+
+/* Unpack LOV object metadata from disk storage. It is packed in LE byte
+ * order and is opaque to the networking layer.
+ */
+int lov_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
+ struct lov_mds_md *lmm, int lmm_bytes)
+{
+ struct obd_device *obd = class_exp2obd(exp);
+ struct lov_obd *lov = &obd->u.lov;
+ int rc = 0, lsm_size;
+ __u16 stripe_count;
+ __u32 magic;
+ __u32 pattern;
+
+ /* If passed an MDS struct use values from there, otherwise defaults */
+ if (lmm) {
+ rc = lov_verify_lmm(lmm, lmm_bytes, &stripe_count);
+ if (rc)
+ return rc;
+ magic = le32_to_cpu(lmm->lmm_magic);
+ } else {
+ magic = LOV_MAGIC;
+ stripe_count = lov_get_stripecnt(lov, magic, 0);
+ }
+
+ /* If we aren't passed an lsmp struct, we just want the size */
+ if (!lsmp) {
+ /* XXX LOV STACKING call into osc for sizes */
+ LBUG();
+ return lov_stripe_md_size(stripe_count);
+ }
+ /* If we are passed an allocated struct but nothing to unpack, free */
+ if (*lsmp && !lmm) {
+ lov_free_memmd(lsmp);
+ return 0;
+ }
+
+ pattern = le32_to_cpu(lmm->lmm_pattern);
+ lsm_size = lov_alloc_memmd(lsmp, stripe_count, pattern, magic);
+ if (lsm_size < 0)
+ return lsm_size;
+
+ /* If we are passed a pointer but nothing to unpack, we only alloc */
+ if (!lmm)
+ return lsm_size;
+
+ LASSERT(lsm_op_find(magic) != NULL);
+ rc = lsm_op_find(magic)->lsm_unpackmd(lov, *lsmp, lmm);
+ if (rc) {
+ lov_free_memmd(lsmp);
+ return rc;
+ }
+
+ return lsm_size;
+}
+
+/* Retrieve object striping information.
+ *
+ * @lump is a pointer to an in-core struct with lmm_ost_count indicating
+ * the maximum number of OST indices which will fit in the user buffer.
+ * lmm_magic must be LOV_USER_MAGIC.
+ */
+int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm,
+ struct lov_user_md *lump)
+{
+ /*
+ * XXX huge struct allocated on stack.
+ */
+ /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
+ struct lov_user_md_v3 lum;
+ struct lov_mds_md *lmmk = NULL;
+ int rc, lmm_size;
+ int lum_size;
+ mm_segment_t seg;
+
+ if (!lsm)
+ return -ENODATA;
+
+ /*
+ * "Switch to kernel segment" to allow copying from kernel space by
+ * copy_{to,from}_user().
+ */
+ seg = get_fs();
+ set_fs(KERNEL_DS);
+
+ /* we only need the header part from user space to get lmm_magic and
+ * lmm_stripe_count, (the header part is common to v1 and v3) */
+ lum_size = sizeof(struct lov_user_md_v1);
+ if (copy_from_user(&lum, lump, lum_size)) {
+ rc = -EFAULT;
+ goto out_set;
+ } else if ((lum.lmm_magic != LOV_USER_MAGIC) &&
+ (lum.lmm_magic != LOV_USER_MAGIC_V3)) {
+ rc = -EINVAL;
+ goto out_set;
+ }
+
+ if (lum.lmm_stripe_count &&
+ (lum.lmm_stripe_count < lsm->lsm_stripe_count)) {
+ /* Return right size of stripe to user */
+ lum.lmm_stripe_count = lsm->lsm_stripe_count;
+ rc = copy_to_user(lump, &lum, lum_size);
+ rc = -EOVERFLOW;
+ goto out_set;
+ }
+ rc = lov_packmd(exp, &lmmk, lsm);
+ if (rc < 0)
+ goto out_set;
+ lmm_size = rc;
+ rc = 0;
+
+ /* FIXME: Bug 1185 - copy fields properly when structs change */
+ /* struct lov_user_md_v3 and struct lov_mds_md_v3 must be the same */
+ CLASSERT(sizeof(lum) == sizeof(struct lov_mds_md_v3));
+ CLASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lmmk->lmm_objects[0]));
+
+ if ((cpu_to_le32(LOV_MAGIC) != LOV_MAGIC) &&
+ ((lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1)) ||
+ (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)))) {
+ lustre_swab_lov_mds_md(lmmk);
+ lustre_swab_lov_user_md_objects(
+ (struct lov_user_ost_data *)lmmk->lmm_objects,
+ lmmk->lmm_stripe_count);
+ }
+ if (lum.lmm_magic == LOV_USER_MAGIC) {
+ /* User request for v1, we need skip lmm_pool_name */
+ if (lmmk->lmm_magic == LOV_MAGIC_V3) {
+ memmove((char *)(&lmmk->lmm_stripe_count) +
+ sizeof(lmmk->lmm_stripe_count),
+ ((struct lov_mds_md_v3 *)lmmk)->lmm_objects,
+ lmmk->lmm_stripe_count *
+ sizeof(struct lov_ost_data_v1));
+ lmm_size -= LOV_MAXPOOLNAME;
+ }
+ } else {
+ /* if v3 we just have to update the lum_size */
+ lum_size = sizeof(struct lov_user_md_v3);
+ }
+
+ /* User wasn't expecting this many OST entries */
+ if (lum.lmm_stripe_count == 0)
+ lmm_size = lum_size;
+ else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count) {
+ rc = -EOVERFLOW;
+ goto out_set;
+ }
+ /*
+ * Have a difference between lov_mds_md & lov_user_md.
+ * So we have to re-order the data before copy to user.
+ */
+ lum.lmm_stripe_count = lmmk->lmm_stripe_count;
+ lum.lmm_layout_gen = lmmk->lmm_layout_gen;
+ ((struct lov_user_md *)lmmk)->lmm_layout_gen = lum.lmm_layout_gen;
+ ((struct lov_user_md *)lmmk)->lmm_stripe_count = lum.lmm_stripe_count;
+ if (copy_to_user(lump, lmmk, lmm_size))
+ rc = -EFAULT;
+
+ obd_free_diskmd(exp, &lmmk);
+out_set:
+ set_fs(seg);
+ return rc;
+}
Code Review / kvmfornfv.git / blobdiff