diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/lov/lov_pack.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/lov/lov_pack.c | 678 |
1 files changed, 678 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/lov/lov_pack.c b/drivers/staging/lustre/lustre/lov/lov_pack.c new file mode 100644 index 000000000000..492948aad685 --- /dev/null +++ b/drivers/staging/lustre/lustre/lov/lov_pack.c @@ -0,0 +1,678 @@ +/* + * 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); +} |