Benny Halevy | c93407d | 2011-05-22 19:49:06 +0300 | [diff] [blame] | 1 | /* |
| 2 | * pNFS Objects layout implementation over open-osd initiator library |
| 3 | * |
| 4 | * Copyright (C) 2009 Panasas Inc. [year of first publication] |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Benny Halevy <bhalevy@panasas.com> |
| 8 | * Boaz Harrosh <bharrosh@panasas.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 |
| 12 | * See the file COPYING included with this distribution for more details. |
| 13 | * |
| 14 | * Redistribution and use in source and binary forms, with or without |
| 15 | * modification, are permitted provided that the following conditions |
| 16 | * are met: |
| 17 | * |
| 18 | * 1. Redistributions of source code must retain the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer. |
| 20 | * 2. Redistributions in binary form must reproduce the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer in the |
| 22 | * documentation and/or other materials provided with the distribution. |
| 23 | * 3. Neither the name of the Panasas company nor the names of its |
| 24 | * contributors may be used to endorse or promote products derived |
| 25 | * from this software without specific prior written permission. |
| 26 | * |
| 27 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 28 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 29 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 30 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 32 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 33 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 34 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 35 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 36 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 37 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 38 | */ |
| 39 | |
| 40 | #include <linux/module.h> |
Boaz Harrosh | 09f5bf4 | 2011-05-22 19:50:20 +0300 | [diff] [blame^] | 41 | #include <scsi/osd_initiator.h> |
| 42 | |
| 43 | #include "objlayout.h" |
| 44 | |
| 45 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD |
| 46 | |
| 47 | #define _LLU(x) ((unsigned long long)x) |
| 48 | |
| 49 | struct caps_buffers { |
| 50 | u8 caps_key[OSD_CRYPTO_KEYID_SIZE]; |
| 51 | u8 creds[OSD_CAP_LEN]; |
| 52 | }; |
| 53 | |
| 54 | struct objio_segment { |
| 55 | struct pnfs_layout_segment lseg; |
| 56 | |
| 57 | struct pnfs_osd_object_cred *comps; |
| 58 | |
| 59 | unsigned mirrors_p1; |
| 60 | unsigned stripe_unit; |
| 61 | unsigned group_width; /* Data stripe_units without integrity comps */ |
| 62 | u64 group_depth; |
| 63 | unsigned group_count; |
| 64 | |
| 65 | unsigned comps_index; |
| 66 | unsigned num_comps; |
| 67 | /* variable length */ |
| 68 | struct objio_dev_ent *ods[]; |
| 69 | }; |
| 70 | |
| 71 | static inline struct objio_segment * |
| 72 | OBJIO_LSEG(struct pnfs_layout_segment *lseg) |
| 73 | { |
| 74 | return container_of(lseg, struct objio_segment, lseg); |
| 75 | } |
| 76 | |
| 77 | static int _verify_data_map(struct pnfs_osd_layout *layout) |
| 78 | { |
| 79 | struct pnfs_osd_data_map *data_map = &layout->olo_map; |
| 80 | u64 stripe_length; |
| 81 | u32 group_width; |
| 82 | |
| 83 | /* FIXME: Only raid0 for now. if not go through MDS */ |
| 84 | if (data_map->odm_raid_algorithm != PNFS_OSD_RAID_0) { |
| 85 | printk(KERN_ERR "Only RAID_0 for now\n"); |
| 86 | return -ENOTSUPP; |
| 87 | } |
| 88 | if (0 != (data_map->odm_num_comps % (data_map->odm_mirror_cnt + 1))) { |
| 89 | printk(KERN_ERR "Data Map wrong, num_comps=%u mirrors=%u\n", |
| 90 | data_map->odm_num_comps, data_map->odm_mirror_cnt); |
| 91 | return -EINVAL; |
| 92 | } |
| 93 | |
| 94 | if (data_map->odm_group_width) |
| 95 | group_width = data_map->odm_group_width; |
| 96 | else |
| 97 | group_width = data_map->odm_num_comps / |
| 98 | (data_map->odm_mirror_cnt + 1); |
| 99 | |
| 100 | stripe_length = (u64)data_map->odm_stripe_unit * group_width; |
| 101 | if (stripe_length >= (1ULL << 32)) { |
| 102 | printk(KERN_ERR "Total Stripe length(0x%llx)" |
| 103 | " >= 32bit is not supported\n", _LLU(stripe_length)); |
| 104 | return -ENOTSUPP; |
| 105 | } |
| 106 | |
| 107 | if (0 != (data_map->odm_stripe_unit & ~PAGE_MASK)) { |
| 108 | printk(KERN_ERR "Stripe Unit(0x%llx)" |
| 109 | " must be Multples of PAGE_SIZE(0x%lx)\n", |
| 110 | _LLU(data_map->odm_stripe_unit), PAGE_SIZE); |
| 111 | return -ENOTSUPP; |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static void copy_single_comp(struct pnfs_osd_object_cred *cur_comp, |
| 118 | struct pnfs_osd_object_cred *src_comp, |
| 119 | struct caps_buffers *caps_p) |
| 120 | { |
| 121 | WARN_ON(src_comp->oc_cap_key.cred_len > sizeof(caps_p->caps_key)); |
| 122 | WARN_ON(src_comp->oc_cap.cred_len > sizeof(caps_p->creds)); |
| 123 | |
| 124 | *cur_comp = *src_comp; |
| 125 | |
| 126 | memcpy(caps_p->caps_key, src_comp->oc_cap_key.cred, |
| 127 | sizeof(caps_p->caps_key)); |
| 128 | cur_comp->oc_cap_key.cred = caps_p->caps_key; |
| 129 | |
| 130 | memcpy(caps_p->creds, src_comp->oc_cap.cred, |
| 131 | sizeof(caps_p->creds)); |
| 132 | cur_comp->oc_cap.cred = caps_p->creds; |
| 133 | } |
| 134 | |
| 135 | int objio_alloc_lseg(struct pnfs_layout_segment **outp, |
| 136 | struct pnfs_layout_hdr *pnfslay, |
| 137 | struct pnfs_layout_range *range, |
| 138 | struct xdr_stream *xdr, |
| 139 | gfp_t gfp_flags) |
| 140 | { |
| 141 | struct objio_segment *objio_seg; |
| 142 | struct pnfs_osd_xdr_decode_layout_iter iter; |
| 143 | struct pnfs_osd_layout layout; |
| 144 | struct pnfs_osd_object_cred *cur_comp, src_comp; |
| 145 | struct caps_buffers *caps_p; |
| 146 | int err; |
| 147 | |
| 148 | err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr); |
| 149 | if (unlikely(err)) |
| 150 | return err; |
| 151 | |
| 152 | err = _verify_data_map(&layout); |
| 153 | if (unlikely(err)) |
| 154 | return err; |
| 155 | |
| 156 | objio_seg = kzalloc(sizeof(*objio_seg) + |
| 157 | sizeof(objio_seg->ods[0]) * layout.olo_num_comps + |
| 158 | sizeof(*objio_seg->comps) * layout.olo_num_comps + |
| 159 | sizeof(struct caps_buffers) * layout.olo_num_comps, |
| 160 | gfp_flags); |
| 161 | if (!objio_seg) |
| 162 | return -ENOMEM; |
| 163 | |
| 164 | objio_seg->comps = (void *)(objio_seg->ods + layout.olo_num_comps); |
| 165 | cur_comp = objio_seg->comps; |
| 166 | caps_p = (void *)(cur_comp + layout.olo_num_comps); |
| 167 | while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err)) |
| 168 | copy_single_comp(cur_comp++, &src_comp, caps_p++); |
| 169 | if (unlikely(err)) |
| 170 | goto err; |
| 171 | |
| 172 | objio_seg->num_comps = layout.olo_num_comps; |
| 173 | objio_seg->comps_index = layout.olo_comps_index; |
| 174 | |
| 175 | objio_seg->mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1; |
| 176 | objio_seg->stripe_unit = layout.olo_map.odm_stripe_unit; |
| 177 | if (layout.olo_map.odm_group_width) { |
| 178 | objio_seg->group_width = layout.olo_map.odm_group_width; |
| 179 | objio_seg->group_depth = layout.olo_map.odm_group_depth; |
| 180 | objio_seg->group_count = layout.olo_map.odm_num_comps / |
| 181 | objio_seg->mirrors_p1 / |
| 182 | objio_seg->group_width; |
| 183 | } else { |
| 184 | objio_seg->group_width = layout.olo_map.odm_num_comps / |
| 185 | objio_seg->mirrors_p1; |
| 186 | objio_seg->group_depth = -1; |
| 187 | objio_seg->group_count = 1; |
| 188 | } |
| 189 | |
| 190 | *outp = &objio_seg->lseg; |
| 191 | return 0; |
| 192 | |
| 193 | err: |
| 194 | kfree(objio_seg); |
| 195 | dprintk("%s: Error: return %d\n", __func__, err); |
| 196 | *outp = NULL; |
| 197 | return err; |
| 198 | } |
| 199 | |
| 200 | void objio_free_lseg(struct pnfs_layout_segment *lseg) |
| 201 | { |
| 202 | struct objio_segment *objio_seg = OBJIO_LSEG(lseg); |
| 203 | |
| 204 | kfree(objio_seg); |
| 205 | } |
| 206 | |
Benny Halevy | c93407d | 2011-05-22 19:49:06 +0300 | [diff] [blame] | 207 | |
| 208 | static struct pnfs_layoutdriver_type objlayout_type = { |
| 209 | .id = LAYOUT_OSD2_OBJECTS, |
| 210 | .name = "LAYOUT_OSD2_OBJECTS", |
Boaz Harrosh | 09f5bf4 | 2011-05-22 19:50:20 +0300 | [diff] [blame^] | 211 | |
| 212 | .alloc_lseg = objlayout_alloc_lseg, |
| 213 | .free_lseg = objlayout_free_lseg, |
Benny Halevy | c93407d | 2011-05-22 19:49:06 +0300 | [diff] [blame] | 214 | }; |
| 215 | |
| 216 | MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects"); |
| 217 | MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>"); |
| 218 | MODULE_LICENSE("GPL"); |
| 219 | |
| 220 | static int __init |
| 221 | objlayout_init(void) |
| 222 | { |
| 223 | int ret = pnfs_register_layoutdriver(&objlayout_type); |
| 224 | |
| 225 | if (ret) |
| 226 | printk(KERN_INFO |
| 227 | "%s: Registering OSD pNFS Layout Driver failed: error=%d\n", |
| 228 | __func__, ret); |
| 229 | else |
| 230 | printk(KERN_INFO "%s: Registered OSD pNFS Layout Driver\n", |
| 231 | __func__); |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | static void __exit |
| 236 | objlayout_exit(void) |
| 237 | { |
| 238 | pnfs_unregister_layoutdriver(&objlayout_type); |
| 239 | printk(KERN_INFO "%s: Unregistered OSD pNFS Layout Driver\n", |
| 240 | __func__); |
| 241 | } |
| 242 | |
| 243 | module_init(objlayout_init); |
| 244 | module_exit(objlayout_exit); |