4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * lustre/lov/lov_pack.c
33 * (Un)packing of OST/MDS requests
35 * Author: Andreas Dilger <adilger@clusterfs.com>
38 #define DEBUG_SUBSYSTEM S_LOV
40 #include <lustre_net.h>
41 #include <lustre_swab.h>
43 #include <obd_class.h>
44 #include <obd_support.h>
46 #include "lov_cl_internal.h"
47 #include "lov_internal.h"
49 void lov_dump_lmm_common(int level, void *lmmp)
51 struct lov_mds_md *lmm = lmmp;
54 lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
55 CDEBUG_LIMIT(level, "objid "DOSTID", magic 0x%08x, pattern %#x\n",
56 POSTID(&oi), le32_to_cpu(lmm->lmm_magic),
57 le32_to_cpu(lmm->lmm_pattern));
58 CDEBUG_LIMIT(level, "stripe_size %u, stripe_count %u, layout_gen %u\n",
59 le32_to_cpu(lmm->lmm_stripe_size),
60 le16_to_cpu(lmm->lmm_stripe_count),
61 le16_to_cpu(lmm->lmm_layout_gen));
64 static void lov_dump_lmm_objects(int level, struct lov_ost_data *lod,
69 if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
71 "bad stripe_count %u > max_stripe_count %u\n",
72 stripe_count, LOV_V1_INSANE_STRIPE_COUNT);
76 for (i = 0; i < stripe_count; ++i, ++lod) {
79 ostid_le_to_cpu(&lod->l_ost_oi, &oi);
80 CDEBUG_LIMIT(level, "stripe %u idx %u subobj "DOSTID"\n", i,
81 le32_to_cpu(lod->l_ost_idx), POSTID(&oi));
85 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm)
87 lov_dump_lmm_common(level, lmm);
88 lov_dump_lmm_objects(level, lmm->lmm_objects,
89 le16_to_cpu(lmm->lmm_stripe_count));
93 * Pack LOV striping metadata for disk storage format (in little
96 * This follows the getxattr() conventions. If \a buf_size is zero
97 * then return the size needed. If \a buf_size is too small then
98 * return -ERANGE. Otherwise return the size of the result.
100 static ssize_t lov_lsm_pack_v1v3(const struct lov_stripe_md *lsm, void *buf,
103 struct lov_mds_md_v1 *lmmv1 = buf;
104 struct lov_mds_md_v3 *lmmv3 = buf;
105 struct lov_ost_data_v1 *lmm_objects;
111 lmm_size = lov_mds_md_size(lsm->lsm_entries[0]->lsme_stripe_count,
116 if (buf_size < lmm_size)
120 * lmmv1 and lmmv3 point to the same struct and have the
123 lmmv1->lmm_magic = cpu_to_le32(lsm->lsm_magic);
124 lmm_oi_cpu_to_le(&lmmv1->lmm_oi, &lsm->lsm_oi);
125 lmmv1->lmm_stripe_size = cpu_to_le32(
126 lsm->lsm_entries[0]->lsme_stripe_size);
127 lmmv1->lmm_stripe_count = cpu_to_le16(
128 lsm->lsm_entries[0]->lsme_stripe_count);
129 lmmv1->lmm_pattern = cpu_to_le32(lsm->lsm_entries[0]->lsme_pattern);
130 lmmv1->lmm_layout_gen = cpu_to_le16(lsm->lsm_layout_gen);
132 if (lsm->lsm_magic == LOV_MAGIC_V3) {
133 BUILD_BUG_ON(sizeof(lsm->lsm_entries[0]->lsme_pool_name) !=
134 sizeof(lmmv3->lmm_pool_name));
135 strscpy(lmmv3->lmm_pool_name,
136 lsm->lsm_entries[0]->lsme_pool_name,
137 sizeof(lmmv3->lmm_pool_name));
138 lmm_objects = lmmv3->lmm_objects;
140 lmm_objects = lmmv1->lmm_objects;
143 if (lsm->lsm_is_released)
146 for (i = 0; i < lsm->lsm_entries[0]->lsme_stripe_count; i++) {
147 struct lov_oinfo *loi = lsm->lsm_entries[0]->lsme_oinfo[i];
149 ostid_cpu_to_le(&loi->loi_oi, &lmm_objects[i].l_ost_oi);
150 lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
151 lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
157 static ssize_t lov_lsm_pack_foreign(const struct lov_stripe_md *lsm, void *buf,
160 struct lov_foreign_md *lfm = buf;
163 lfm_size = lsm->lsm_foreign_size;
168 /* if buffer too small return ERANGE but copy the size the
169 * caller has requested anyway. This may be useful to get
170 * only the header without the need to alloc the full size
172 if (buf_size < lfm_size) {
173 memcpy(lfm, lsm_foreign(lsm), buf_size);
177 /* full foreign LOV is already avail in its cache
178 * no need to translate format fields to little-endian
180 memcpy(lfm, lsm_foreign(lsm), lsm->lsm_foreign_size);
185 static unsigned int lov_lsme_pack_foreign(struct lov_stripe_md_entry *lsme,
188 struct lov_foreign_md *lfm = (struct lov_foreign_md *)lmm;
190 lfm->lfm_magic = cpu_to_le32(lsme->lsme_magic);
191 lfm->lfm_length = cpu_to_le32(lsme->lsme_length);
192 lfm->lfm_type = cpu_to_le32(lsme->lsme_type);
193 lfm->lfm_flags = cpu_to_le32(lsme->lsme_foreign_flags);
195 /* TODO: support for foreign layout other than HSM, i.e. DAOS. */
196 if (lov_hsm_type_supported(lsme->lsme_type))
197 lov_foreign_hsm_to_le(lfm, &lsme->lsme_hsm);
199 return lov_foreign_md_size(lsme->lsme_length);
202 static unsigned int lov_lsme_pack_v1v3(struct lov_stripe_md_entry *lsme,
203 struct lov_mds_md *lmm)
205 struct lov_ost_data_v1 *lmm_objects;
209 lmm->lmm_magic = cpu_to_le32(lsme->lsme_magic);
210 /* lmm->lmm_oi not set */
211 lmm->lmm_pattern = cpu_to_le32(lsme->lsme_pattern);
212 lmm->lmm_stripe_size = cpu_to_le32(lsme->lsme_stripe_size);
213 lmm->lmm_stripe_count = cpu_to_le16(lsme->lsme_stripe_count);
214 lmm->lmm_layout_gen = cpu_to_le16(lsme->lsme_layout_gen);
216 if (lsme->lsme_magic == LOV_MAGIC_V3) {
217 struct lov_mds_md_v3 *lmmv3 = (struct lov_mds_md_v3 *)lmm;
219 strscpy(lmmv3->lmm_pool_name, lsme->lsme_pool_name,
220 sizeof(lmmv3->lmm_pool_name));
221 lmm_objects = lmmv3->lmm_objects;
223 lmm_objects = ((struct lov_mds_md_v1 *)lmm)->lmm_objects;
226 if (lsme_inited(lsme) && !(lsme->lsme_pattern & LOV_PATTERN_F_RELEASED))
227 stripe_count = lsme->lsme_stripe_count;
231 for (i = 0; i < stripe_count; i++) {
232 struct lov_oinfo *loi = lsme->lsme_oinfo[i];
234 ostid_cpu_to_le(&loi->loi_oi, &lmm_objects[i].l_ost_oi);
235 lmm_objects[i].l_ost_gen = cpu_to_le32(loi->loi_ost_gen);
236 lmm_objects[i].l_ost_idx = cpu_to_le32(loi->loi_ost_idx);
239 return lov_mds_md_size(stripe_count, lsme->lsme_magic);
242 ssize_t lov_lsm_pack(const struct lov_stripe_md *lsm, void *buf,
245 struct lov_comp_md_v1 *lcmv1 = buf;
246 struct lov_comp_md_entry_v1 *lcme;
254 if (lsm->lsm_magic == LOV_MAGIC_V1 || lsm->lsm_magic == LOV_MAGIC_V3)
255 return lov_lsm_pack_v1v3(lsm, buf, buf_size);
257 if (lsm->lsm_magic == LOV_MAGIC_FOREIGN)
258 return lov_lsm_pack_foreign(lsm, buf, buf_size);
260 lmm_size = lov_comp_md_size(lsm);
264 if (buf_size < lmm_size)
267 lcmv1->lcm_magic = cpu_to_le32(lsm->lsm_magic);
268 lcmv1->lcm_size = cpu_to_le32(lmm_size);
269 lcmv1->lcm_layout_gen = cpu_to_le32(lsm->lsm_layout_gen);
270 lcmv1->lcm_flags = cpu_to_le16(lsm->lsm_flags);
271 lcmv1->lcm_mirror_count = cpu_to_le16(lsm->lsm_mirror_count);
272 lcmv1->lcm_entry_count = cpu_to_le16(lsm->lsm_entry_count);
274 offset = sizeof(*lcmv1) + sizeof(*lcme) * lsm->lsm_entry_count;
276 for (entry = 0; entry < lsm->lsm_entry_count; entry++) {
277 struct lov_stripe_md_entry *lsme;
278 struct lov_mds_md *lmm;
280 lsme = lsm->lsm_entries[entry];
281 lcme = &lcmv1->lcm_entries[entry];
283 lcme->lcme_id = cpu_to_le32(lsme->lsme_id);
284 lcme->lcme_flags = cpu_to_le32(lsme->lsme_flags);
285 if (lsme->lsme_flags & LCME_FL_NOSYNC)
286 lcme->lcme_timestamp =
287 cpu_to_le64(lsme->lsme_timestamp);
288 lcme->lcme_extent.e_start =
289 cpu_to_le64(lsme->lsme_extent.e_start);
290 lcme->lcme_extent.e_end =
291 cpu_to_le64(lsme->lsme_extent.e_end);
292 lcme->lcme_offset = cpu_to_le32(offset);
294 lmm = (struct lov_mds_md *)((char *)lcmv1 + offset);
295 if (lsme->lsme_magic == LOV_MAGIC_FOREIGN)
296 size = lov_lsme_pack_foreign(lsme, lmm);
298 size = lov_lsme_pack_v1v3(lsme, lmm);
299 lcme->lcme_size = cpu_to_le32(size);
301 } /* for each layout component */
306 /* Find the max stripecount we should use */
307 __u16 lov_get_stripe_count(struct lov_obd *lov, __u32 magic, __u16 stripe_count)
309 __u32 max_stripes = LOV_MAX_STRIPE_COUNT_OLD;
312 stripe_count = lov->desc.ld_default_stripe_count;
313 if (stripe_count > lov->desc.ld_active_tgt_count)
314 stripe_count = lov->desc.ld_active_tgt_count;
319 * stripe count is based on whether ldiskfs can handle
322 if (lov->lov_ocd.ocd_connect_flags & OBD_CONNECT_MAX_EASIZE &&
323 lov->lov_ocd.ocd_max_easize)
324 max_stripes = lov_mds_md_max_stripe_count(
325 lov->lov_ocd.ocd_max_easize, magic);
327 if (stripe_count > max_stripes)
328 stripe_count = max_stripes;
333 int lov_free_memmd(struct lov_stripe_md **lsmp)
335 struct lov_stripe_md *lsm = *lsmp;
339 refc = atomic_dec_return(&lsm->lsm_refc);
348 * Unpack LOV object metadata from disk storage. It is packed in LE byte
349 * order and is opaque to the networking layer.
351 struct lov_stripe_md *lov_unpackmd(struct lov_obd *lov, void *buf,
354 const struct lsm_operations *op;
355 struct lov_stripe_md *lsm;
360 if (buf_size < sizeof(magic))
361 RETURN(ERR_PTR(-EINVAL));
363 magic = le32_to_cpu(*(u32 *)buf);
364 op = lsm_op_find(magic);
366 RETURN(ERR_PTR(-EINVAL));
368 lsm = op->lsm_unpackmd(lov, buf, buf_size);
374 * Retrieve object striping information.
376 * @lump is a pointer to an in-core struct with lmm_ost_count indicating
377 * the maximum number of OST indices which will fit in the user buffer.
378 * lmm_magic must be LOV_USER_MAGIC.
380 * If @size > 0, User specified limited buffer size, usually the buffer is from
381 * ll_lov_setstripe(), and the buffer can only hold basic layout template info.
383 int lov_getstripe(const struct lu_env *env, struct lov_object *obj,
384 struct lov_stripe_md *lsm, struct lov_user_md __user *lump,
387 /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
388 struct lov_mds_md *lmmk, *lmm;
389 struct lov_foreign_md *lfm;
390 struct lov_user_md_v1 lum;
391 size_t lmmk_size, lum_size = 0;
397 if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3 &&
398 lsm->lsm_magic != LOV_MAGIC_COMP_V1 &&
399 lsm->lsm_magic != LOV_MAGIC_FOREIGN) {
400 CERROR("bad LSM MAGIC: 0x%08X != 0x%08X nor 0x%08X\n",
401 lsm->lsm_magic, LOV_MAGIC_V1, LOV_MAGIC_V3);
402 GOTO(out, rc = -EIO);
405 lmmk_size = lov_comp_md_size(lsm);
407 OBD_ALLOC_LARGE(lmmk, lmmk_size);
409 GOTO(out, rc = -ENOMEM);
411 lmm_size = lov_lsm_pack(lsm, lmmk, lmmk_size);
413 GOTO(out_free, rc = lmm_size);
415 if (cpu_to_le32(LOV_MAGIC) != LOV_MAGIC) {
416 if (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1) ||
417 lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
418 lustre_swab_lov_mds_md(lmmk);
419 lustre_swab_lov_user_md_objects(
420 (struct lov_user_ost_data *)lmmk->lmm_objects,
421 lmmk->lmm_stripe_count);
422 } else if (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_COMP_V1)) {
423 lustre_swab_lov_comp_md_v1(
424 (struct lov_comp_md_v1 *)lmmk);
425 } else if (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_FOREIGN)) {
426 lfm = (struct lov_foreign_md *)lmmk;
427 __swab32s(&lfm->lfm_magic);
428 __swab32s(&lfm->lfm_length);
429 __swab32s(&lfm->lfm_type);
430 __swab32s(&lfm->lfm_flags);
435 * Legacy appication passes limited buffer, we need to figure out
436 * the user buffer size by the passed in lmm_stripe_count.
438 if (lsm->lsm_magic != LOV_MAGIC_FOREIGN)
439 if (copy_from_user(&lum, lump, sizeof(struct lov_user_md_v1)))
440 GOTO(out_free, rc = -EFAULT);
442 if (lum.lmm_magic == LOV_USER_MAGIC_V1 ||
443 lum.lmm_magic == LOV_USER_MAGIC_V3)
444 lum_size = lov_user_md_size(lum.lmm_stripe_count,
448 struct lov_mds_md *comp_md = lmmk;
451 * Legacy app (ADIO for instance) treats the layout as V1/V3
452 * blindly, we'd return a reasonable V1/V3 for them.
454 if (lmmk->lmm_magic == LOV_MAGIC_COMP_V1) {
455 struct lov_comp_md_v1 *comp_v1;
456 struct cl_object *cl_obj;
461 cl_obj = cl_object_top(&obj->lo_cl);
462 cl_object_attr_lock(cl_obj);
463 cl_object_attr_get(env, cl_obj, &attr);
464 cl_object_attr_unlock(cl_obj);
467 * return the last instantiated component if file size
468 * is non-zero, otherwise, return the last component.
470 comp_v1 = (struct lov_comp_md_v1 *)lmmk;
471 i = attr.cat_size == 0 ? comp_v1->lcm_entry_count : 0;
472 for (; i < comp_v1->lcm_entry_count; i++) {
473 if (!(comp_v1->lcm_entries[i].lcme_flags &
479 comp_md = (struct lov_mds_md *)((char *)comp_v1 +
480 comp_v1->lcm_entries[i].lcme_offset);
481 lum_size = comp_v1->lcm_entries[i].lcme_size;
485 lmm_size = min(lum_size, lmmk_size);
488 lmm_size = lmmk_size;
492 * User specified limited buffer size, usually the buffer is
493 * from ll_lov_setstripe(), and the buffer can only hold basic
494 * layout template info.
496 if (size == 0 || size > lmm_size)
498 if (copy_to_user(lump, lmm, size))
499 GOTO(out_free, rc = -EFAULT);
502 OBD_FREE_LARGE(lmmk, lmmk_size);