| /* |
| * 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 <lustre_net.h> |
| #include <obd.h> |
| #include <obd_lov.h> |
| #include <obd_class.h> |
| #include <obd_support.h> |
| #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 = ((struct lov_mds_md_v1 *)(lmm))->lmm_magic; |
| switch (magic) { |
| case LOV_MAGIC_V1: |
| return lov_dump_lmm_v1(level, (struct lov_mds_md_v1 *)(lmm)); |
| case LOV_MAGIC_V3: |
| return lov_dump_lmm_v3(level, (struct lov_mds_md_v3 *)(lmm)); |
| default: |
| CERROR("Cannot recognize lmm_magic %x", magic); |
| } |
| return; |
| } |
| |
| #define LMM_ASSERT(test) \ |
| do { \ |
| if (!(test)) lov_dump_lmm(D_ERROR, lmm); \ |
| LASSERT(test); /* so we know what assertion failed */ \ |
| } while(0) |
| |
| /* 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 obd_id |
| * 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; |
| ENTRY; |
| |
| 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 { |
| stripe_count = lsm->lsm_stripe_count; |
| } |
| } 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_stripecnt(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_stripecnt(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; |
| ENTRY; |
| |
| 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; |
| (*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); |
| if ((refc = atomic_dec_return(&lsm->lsm_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; |
| ENTRY; |
| |
| /* 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); |
| } |
| |
| lsm_size = lov_alloc_memmd(lsmp, stripe_count, LOV_PATTERN_RAID0, |
| 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); |
| } |
| |
| static int __lov_setstripe(struct obd_export *exp, int max_lmm_size, |
| struct lov_stripe_md **lsmp, |
| struct lov_user_md *lump) |
| { |
| struct obd_device *obd = class_exp2obd(exp); |
| struct lov_obd *lov = &obd->u.lov; |
| char buffer[sizeof(struct lov_user_md_v3)]; |
| struct lov_user_md_v3 *lumv3 = (struct lov_user_md_v3 *)&buffer[0]; |
| struct lov_user_md_v1 *lumv1 = (struct lov_user_md_v1 *)&buffer[0]; |
| int lmm_magic; |
| __u16 stripe_count; |
| int rc; |
| int cplen = 0; |
| ENTRY; |
| |
| rc = lov_lum_swab_if_needed(lumv3, &lmm_magic, lump); |
| if (rc) |
| RETURN(rc); |
| |
| /* in the rest of the tests, as *lumv1 and lumv3 have the same |
| * fields, we use lumv1 to avoid code duplication */ |
| |
| if (lumv1->lmm_pattern == 0) { |
| lumv1->lmm_pattern = lov->desc.ld_pattern ? |
| lov->desc.ld_pattern : LOV_PATTERN_RAID0; |
| } |
| |
| if (lumv1->lmm_pattern != LOV_PATTERN_RAID0) { |
| CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n", |
| lumv1->lmm_pattern); |
| RETURN(-EINVAL); |
| } |
| |
| /* 64kB is the largest common page size we see (ia64), and matches the |
| * check in lfs */ |
| if (lumv1->lmm_stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) { |
| CDEBUG(D_IOCTL, "stripe size %u not multiple of %u, fixing\n", |
| lumv1->lmm_stripe_size, LOV_MIN_STRIPE_SIZE); |
| lumv1->lmm_stripe_size = LOV_MIN_STRIPE_SIZE; |
| } |
| |
| if ((lumv1->lmm_stripe_offset >= lov->desc.ld_tgt_count) && |
| (lumv1->lmm_stripe_offset != |
| (typeof(lumv1->lmm_stripe_offset))(-1))) { |
| CDEBUG(D_IOCTL, "stripe offset %u > number of OSTs %u\n", |
| lumv1->lmm_stripe_offset, lov->desc.ld_tgt_count); |
| RETURN(-EINVAL); |
| } |
| stripe_count = lov_get_stripecnt(lov, lmm_magic, |
| lumv1->lmm_stripe_count); |
| |
| if (max_lmm_size) { |
| int max_stripes = (max_lmm_size - |
| lov_mds_md_size(0, lmm_magic)) / |
| sizeof(struct lov_ost_data_v1); |
| if (unlikely(max_stripes < stripe_count)) { |
| CDEBUG(D_IOCTL, "stripe count reset from %d to %d\n", |
| stripe_count, max_stripes); |
| stripe_count = max_stripes; |
| } |
| } |
| |
| if (lmm_magic == LOV_USER_MAGIC_V3) { |
| struct pool_desc *pool; |
| |
| /* In the function below, .hs_keycmp resolves to |
| * pool_hashkey_keycmp() */ |
| /* coverity[overrun-buffer-val] */ |
| pool = lov_find_pool(lov, lumv3->lmm_pool_name); |
| if (pool != NULL) { |
| if (lumv3->lmm_stripe_offset != |
| (typeof(lumv3->lmm_stripe_offset))(-1)) { |
| rc = lov_check_index_in_pool( |
| lumv3->lmm_stripe_offset, pool); |
| if (rc < 0) { |
| lov_pool_putref(pool); |
| RETURN(-EINVAL); |
| } |
| } |
| |
| if (stripe_count > pool_tgt_count(pool)) |
| stripe_count = pool_tgt_count(pool); |
| |
| lov_pool_putref(pool); |
| } |
| } |
| |
| rc = lov_alloc_memmd(lsmp, stripe_count, lumv1->lmm_pattern, lmm_magic); |
| |
| if (rc >= 0) { |
| (*lsmp)->lsm_oinfo[0]->loi_ost_idx = lumv1->lmm_stripe_offset; |
| (*lsmp)->lsm_stripe_size = lumv1->lmm_stripe_size; |
| if (lmm_magic == LOV_USER_MAGIC_V3) { |
| cplen = strlcpy((*lsmp)->lsm_pool_name, |
| lumv3->lmm_pool_name, |
| sizeof((*lsmp)->lsm_pool_name)); |
| if (cplen >= sizeof((*lsmp)->lsm_pool_name)) |
| rc = -E2BIG; |
| } |
| rc = 0; |
| } |
| |
| RETURN(rc); |
| } |
| |
| /* Configure object striping information on a new file. |
| * |
| * @lmmu is a pointer to a user struct with one or more of the fields set to |
| * indicate the application preference: lmm_stripe_count, lmm_stripe_size, |
| * lmm_stripe_offset, and lmm_stripe_pattern. lmm_magic must be LOV_MAGIC. |
| * @lsmp is a pointer to an in-core stripe MD that needs to be filled in. |
| */ |
| int lov_setstripe(struct obd_export *exp, int max_lmm_size, |
| struct lov_stripe_md **lsmp, struct lov_user_md *lump) |
| { |
| int rc; |
| mm_segment_t seg; |
| |
| seg = get_fs(); |
| set_fs(KERNEL_DS); |
| |
| rc = __lov_setstripe(exp, max_lmm_size, lsmp, lump); |
| set_fs(seg); |
| RETURN(rc); |
| } |
| |
| int lov_setea(struct obd_export *exp, struct lov_stripe_md **lsmp, |
| struct lov_user_md *lump) |
| { |
| int i; |
| int rc; |
| struct obd_export *oexp; |
| struct lov_obd *lov = &exp->exp_obd->u.lov; |
| obd_id last_id = 0; |
| struct lov_user_ost_data_v1 *lmm_objects; |
| |
| ENTRY; |
| |
| if (lump->lmm_magic == LOV_USER_MAGIC_V3) |
| lmm_objects = ((struct lov_user_md_v3 *)lump)->lmm_objects; |
| else |
| lmm_objects = lump->lmm_objects; |
| |
| for (i = 0; i < lump->lmm_stripe_count; i++) { |
| __u32 len = sizeof(last_id); |
| oexp = lov->lov_tgts[lmm_objects[i].l_ost_idx]->ltd_exp; |
| rc = obd_get_info(NULL, oexp, sizeof(KEY_LAST_ID), KEY_LAST_ID, |
| &len, &last_id, NULL); |
| if (rc) |
| RETURN(rc); |
| if (ostid_id(&lmm_objects[i].l_ost_oi) > last_id) { |
| CERROR("Setting EA for object > than last id on" |
| " ost idx %d "DOSTID" > "LPD64" \n", |
| lmm_objects[i].l_ost_idx, |
| POSTID(&lmm_objects[i].l_ost_oi), last_id); |
| RETURN(-EINVAL); |
| } |
| } |
| |
| rc = lov_setstripe(exp, 0, lsmp, lump); |
| if (rc) |
| RETURN(rc); |
| |
| for (i = 0; i < lump->lmm_stripe_count; i++) { |
| (*lsmp)->lsm_oinfo[i]->loi_ost_idx = |
| lmm_objects[i].l_ost_idx; |
| (*lsmp)->lsm_oinfo[i]->loi_oi = lmm_objects[i].l_ost_oi; |
| } |
| RETURN(0); |
| } |
| |
| |
| /* 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; |
| ENTRY; |
| |
| 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)) |
| GOTO(out_set, rc = -EFAULT); |
| else if ((lum.lmm_magic != LOV_USER_MAGIC) && |
| (lum.lmm_magic != LOV_USER_MAGIC_V3)) |
| GOTO(out_set, rc = -EINVAL); |
| |
| 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); |
| GOTO(out_set, rc = -EOVERFLOW); |
| } |
| rc = lov_packmd(exp, &lmmk, lsm); |
| if (rc < 0) |
| GOTO(out_set, rc); |
| 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) |
| GOTO(out_set, rc = -EOVERFLOW); |
| /* |
| * 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); |
| } |