| /* |
| * 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) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2011, 2015, 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 <lustre_swab.h> |
| #include <obd.h> |
| #include <obd_class.h> |
| #include <obd_support.h> |
| |
| #include "lov_cl_internal.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)); |
| } |
| |
| /** |
| * Pack LOV striping metadata for disk storage format (in little |
| * endian byte order). |
| * |
| * This follows the getxattr() conventions. If \a buf_size is zero |
| * then return the size needed. If \a buf_size is too small then |
| * return -ERANGE. Otherwise return the size of the result. |
| */ |
| ssize_t lov_lsm_pack(const struct lov_stripe_md *lsm, void *buf, |
| size_t buf_size) |
| { |
| struct lov_ost_data_v1 *lmm_objects; |
| struct lov_mds_md_v1 *lmmv1 = buf; |
| struct lov_mds_md_v3 *lmmv3 = buf; |
| size_t lmm_size; |
| unsigned int i; |
| |
| lmm_size = lov_mds_md_size(lsm->lsm_stripe_count, lsm->lsm_magic); |
| if (!buf_size) |
| return lmm_size; |
| |
| if (buf_size < lmm_size) |
| return -ERANGE; |
| |
| /* |
| * lmmv1 and lmmv3 point to the same struct and have the |
| * same first fields |
| */ |
| lmmv1->lmm_magic = cpu_to_le32(lsm->lsm_magic); |
| 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(lsm->lsm_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) { |
| BUILD_BUG_ON(sizeof(lsm->lsm_pool_name) != |
| sizeof(lmmv3->lmm_pool_name)); |
| strlcpy(lmmv3->lmm_pool_name, lsm->lsm_pool_name, |
| sizeof(lmmv3->lmm_pool_name)); |
| lmm_objects = lmmv3->lmm_objects; |
| } else { |
| lmm_objects = lmmv1->lmm_objects; |
| } |
| |
| for (i = 0; i < lsm->lsm_stripe_count; i++) { |
| struct lov_oinfo *loi = lsm->lsm_oinfo[i]; |
| |
| 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))) { |
| CERROR("bad disk LOV MAGIC: 0x%08X; dumping LMM (size=%d):\n", |
| le32_to_cpu(*(__u32 *)lmm), lmm_bytes); |
| CERROR("%*phN\n", lmm_bytes, lmm); |
| return -EINVAL; |
| } |
| rc = lsm_op_find(le32_to_cpu(*(__u32 *)lmm))->lsm_lmm_verify(lmm, |
| lmm_bytes, |
| stripe_count); |
| return rc; |
| } |
| |
| static struct lov_stripe_md *lov_lsm_alloc(u16 stripe_count, u32 pattern, |
| u32 magic) |
| { |
| struct lov_stripe_md *lsm; |
| unsigned int i; |
| |
| CDEBUG(D_INFO, "alloc lsm, stripe_count %u\n", stripe_count); |
| |
| lsm = lsm_alloc_plain(stripe_count); |
| if (!lsm) { |
| CERROR("cannot allocate LSM stripe_count %u\n", stripe_count); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| atomic_set(&lsm->lsm_refc, 1); |
| spin_lock_init(&lsm->lsm_lock); |
| lsm->lsm_magic = magic; |
| lsm->lsm_stripe_count = stripe_count; |
| lsm->lsm_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES * stripe_count; |
| lsm->lsm_pattern = pattern; |
| lsm->lsm_pool_name[0] = '\0'; |
| lsm->lsm_layout_gen = 0; |
| if (stripe_count > 0) |
| lsm->lsm_oinfo[0]->loi_ost_idx = ~0; |
| |
| for (i = 0; i < stripe_count; i++) |
| loi_init(lsm->lsm_oinfo[i]); |
| |
| return lsm; |
| } |
| |
| 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) |
| 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. |
| */ |
| struct lov_stripe_md *lov_unpackmd(struct lov_obd *lov, struct lov_mds_md *lmm, |
| size_t lmm_size) |
| { |
| struct lov_stripe_md *lsm; |
| u16 stripe_count; |
| u32 pattern; |
| u32 magic; |
| int rc; |
| |
| rc = lov_verify_lmm(lmm, lmm_size, &stripe_count); |
| if (rc) |
| return ERR_PTR(rc); |
| |
| magic = le32_to_cpu(lmm->lmm_magic); |
| pattern = le32_to_cpu(lmm->lmm_pattern); |
| |
| lsm = lov_lsm_alloc(stripe_count, pattern, magic); |
| if (IS_ERR(lsm)) |
| return lsm; |
| |
| LASSERT(lsm_op_find(magic)); |
| rc = lsm_op_find(magic)->lsm_unpackmd(lov, lsm, lmm); |
| if (rc) { |
| lov_free_memmd(&lsm); |
| return ERR_PTR(rc); |
| } |
| |
| return lsm; |
| } |
| |
| /* 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 lov_object *obj, struct lov_stripe_md *lsm, |
| struct lov_user_md __user *lump) |
| { |
| /* 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; |
| u32 stripe_count; |
| ssize_t lmm_size; |
| size_t lmmk_size; |
| size_t lum_size; |
| int rc; |
| |
| if (!lsm) |
| return -ENODATA; |
| |
| if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) { |
| CERROR("bad LSM MAGIC: 0x%08X != 0x%08X nor 0x%08X\n", |
| lsm->lsm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3); |
| rc = -EIO; |
| goto out; |
| } |
| |
| if (!lsm_is_released(lsm)) |
| stripe_count = lsm->lsm_stripe_count; |
| else |
| stripe_count = 0; |
| |
| /* 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; |
| } |
| if (lum.lmm_magic != LOV_USER_MAGIC_V1 && |
| lum.lmm_magic != LOV_USER_MAGIC_V3 && |
| lum.lmm_magic != LOV_USER_MAGIC_SPECIFIC) { |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| if (lum.lmm_stripe_count && |
| (lum.lmm_stripe_count < lsm->lsm_stripe_count)) { |
| /* Return right size of stripe to user */ |
| lum.lmm_stripe_count = stripe_count; |
| rc = copy_to_user(lump, &lum, lum_size); |
| rc = -EOVERFLOW; |
| goto out; |
| } |
| lmmk_size = lov_mds_md_size(stripe_count, lsm->lsm_magic); |
| |
| |
| lmmk = libcfs_kvzalloc(lmmk_size, GFP_NOFS); |
| if (!lmmk) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| lmm_size = lov_lsm_pack(lsm, lmmk, lmmk_size); |
| if (lmm_size < 0) { |
| rc = lmm_size; |
| goto out_free; |
| } |
| |
| /* FIXME: Bug 1185 - copy fields properly when structs change */ |
| /* struct lov_user_md_v3 and struct lov_mds_md_v3 must be the same */ |
| BUILD_BUG_ON(sizeof(lum) != sizeof(struct lov_mds_md_v3)); |
| BUILD_BUG_ON(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(((struct lov_mds_md_v1 *)lmmk)->lmm_objects, |
| ((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_free; |
| } |
| /* |
| * 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; |
| else |
| rc = 0; |
| |
| out_free: |
| kvfree(lmmk); |
| out: |
| return rc; |
| } |