2 * pNFS Objects layout implementation over open-osd initiator library
4 * Copyright (C) 2009 Panasas Inc. [year of first publication]
7 * Benny Halevy <bhalevy@panasas.com>
8 * Boaz Harrosh <bharrosh@panasas.com>
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.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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.
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.
40 #include <linux/module.h>
41 #include <scsi/osd_initiator.h>
43 #include "objlayout.h"
45 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
47 #define _LLU(x) ((unsigned long long)x)
50 u8 caps_key[OSD_CRYPTO_KEYID_SIZE];
51 u8 creds[OSD_CAP_LEN];
54 struct objio_segment {
55 struct pnfs_layout_segment lseg;
57 struct pnfs_osd_object_cred *comps;
61 unsigned group_width; /* Data stripe_units without integrity comps */
68 struct objio_dev_ent *ods[];
71 static inline struct objio_segment *
72 OBJIO_LSEG(struct pnfs_layout_segment *lseg)
74 return container_of(lseg, struct objio_segment, lseg);
77 static int _verify_data_map(struct pnfs_osd_layout *layout)
79 struct pnfs_osd_data_map *data_map = &layout->olo_map;
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");
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);
94 if (data_map->odm_group_width)
95 group_width = data_map->odm_group_width;
97 group_width = data_map->odm_num_comps /
98 (data_map->odm_mirror_cnt + 1);
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));
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);
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)
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));
124 *cur_comp = *src_comp;
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;
130 memcpy(caps_p->creds, src_comp->oc_cap.cred,
131 sizeof(caps_p->creds));
132 cur_comp->oc_cap.cred = caps_p->creds;
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,
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;
148 err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
152 err = _verify_data_map(&layout);
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,
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++);
172 objio_seg->num_comps = layout.olo_num_comps;
173 objio_seg->comps_index = layout.olo_comps_index;
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;
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;
190 *outp = &objio_seg->lseg;
195 dprintk("%s: Error: return %d\n", __func__, err);
200 void objio_free_lseg(struct pnfs_layout_segment *lseg)
202 struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
208 static struct pnfs_layoutdriver_type objlayout_type = {
209 .id = LAYOUT_OSD2_OBJECTS,
210 .name = "LAYOUT_OSD2_OBJECTS",
212 .alloc_lseg = objlayout_alloc_lseg,
213 .free_lseg = objlayout_free_lseg,
216 MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects");
217 MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>");
218 MODULE_LICENSE("GPL");
223 int ret = pnfs_register_layoutdriver(&objlayout_type);
227 "%s: Registering OSD pNFS Layout Driver failed: error=%d\n",
230 printk(KERN_INFO "%s: Registered OSD pNFS Layout Driver\n",
238 pnfs_unregister_layoutdriver(&objlayout_type);
239 printk(KERN_INFO "%s: Unregistered OSD pNFS Layout Driver\n",
243 module_init(objlayout_init);
244 module_exit(objlayout_exit);