Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
pnfs_osd_xdr_cli.c
Go to the documentation of this file.
1 /*
2  * Object-Based pNFS Layout XDR layer
3  *
4  * Copyright (C) 2007 Panasas Inc. [year of first publication]
5  * All rights reserved.
6  *
7  * Benny Halevy <[email protected]>
8  * Boaz Harrosh <[email protected]>
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/pnfs_osd_xdr.h>
41 
42 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
43 
44 /*
45  * The following implementation is based on RFC5664
46  */
47 
48 /*
49  * struct pnfs_osd_objid {
50  * struct nfs4_deviceid oid_device_id;
51  * u64 oid_partition_id;
52  * u64 oid_object_id;
53  * }; // xdr size 32 bytes
54  */
55 static __be32 *
56 _osd_xdr_decode_objid(__be32 *p, struct pnfs_osd_objid *objid)
57 {
58  p = xdr_decode_opaque_fixed(p, objid->oid_device_id.data,
59  sizeof(objid->oid_device_id.data));
60 
61  p = xdr_decode_hyper(p, &objid->oid_partition_id);
62  p = xdr_decode_hyper(p, &objid->oid_object_id);
63  return p;
64 }
65 /*
66  * struct pnfs_osd_opaque_cred {
67  * u32 cred_len;
68  * void *cred;
69  * }; // xdr size [variable]
70  * The return pointers are from the xdr buffer
71  */
72 static int
73 _osd_xdr_decode_opaque_cred(struct pnfs_osd_opaque_cred *opaque_cred,
74  struct xdr_stream *xdr)
75 {
76  __be32 *p = xdr_inline_decode(xdr, 1);
77 
78  if (!p)
79  return -EINVAL;
80 
81  opaque_cred->cred_len = be32_to_cpu(*p++);
82 
83  p = xdr_inline_decode(xdr, opaque_cred->cred_len);
84  if (!p)
85  return -EINVAL;
86 
87  opaque_cred->cred = p;
88  return 0;
89 }
90 
91 /*
92  * struct pnfs_osd_object_cred {
93  * struct pnfs_osd_objid oc_object_id;
94  * u32 oc_osd_version;
95  * u32 oc_cap_key_sec;
96  * struct pnfs_osd_opaque_cred oc_cap_key
97  * struct pnfs_osd_opaque_cred oc_cap;
98  * }; // xdr size 32 + 4 + 4 + [variable] + [variable]
99  */
100 static int
101 _osd_xdr_decode_object_cred(struct pnfs_osd_object_cred *comp,
102  struct xdr_stream *xdr)
103 {
104  __be32 *p = xdr_inline_decode(xdr, 32 + 4 + 4);
105  int ret;
106 
107  if (!p)
108  return -EIO;
109 
110  p = _osd_xdr_decode_objid(p, &comp->oc_object_id);
111  comp->oc_osd_version = be32_to_cpup(p++);
112  comp->oc_cap_key_sec = be32_to_cpup(p);
113 
114  ret = _osd_xdr_decode_opaque_cred(&comp->oc_cap_key, xdr);
115  if (unlikely(ret))
116  return ret;
117 
118  ret = _osd_xdr_decode_opaque_cred(&comp->oc_cap, xdr);
119  return ret;
120 }
121 
122 /*
123  * struct pnfs_osd_data_map {
124  * u32 odm_num_comps;
125  * u64 odm_stripe_unit;
126  * u32 odm_group_width;
127  * u32 odm_group_depth;
128  * u32 odm_mirror_cnt;
129  * u32 odm_raid_algorithm;
130  * }; // xdr size 4 + 8 + 4 + 4 + 4 + 4
131  */
132 static inline int
133 _osd_data_map_xdr_sz(void)
134 {
135  return 4 + 8 + 4 + 4 + 4 + 4;
136 }
137 
138 static __be32 *
139 _osd_xdr_decode_data_map(__be32 *p, struct pnfs_osd_data_map *data_map)
140 {
141  data_map->odm_num_comps = be32_to_cpup(p++);
142  p = xdr_decode_hyper(p, &data_map->odm_stripe_unit);
143  data_map->odm_group_width = be32_to_cpup(p++);
144  data_map->odm_group_depth = be32_to_cpup(p++);
145  data_map->odm_mirror_cnt = be32_to_cpup(p++);
146  data_map->odm_raid_algorithm = be32_to_cpup(p++);
147  dprintk("%s: odm_num_comps=%u odm_stripe_unit=%llu odm_group_width=%u "
148  "odm_group_depth=%u odm_mirror_cnt=%u odm_raid_algorithm=%u\n",
149  __func__,
150  data_map->odm_num_comps,
151  (unsigned long long)data_map->odm_stripe_unit,
152  data_map->odm_group_width,
153  data_map->odm_group_depth,
154  data_map->odm_mirror_cnt,
155  data_map->odm_raid_algorithm);
156  return p;
157 }
158 
160  struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr)
161 {
162  __be32 *p;
163 
164  memset(iter, 0, sizeof(*iter));
165 
166  p = xdr_inline_decode(xdr, _osd_data_map_xdr_sz() + 4 + 4);
167  if (unlikely(!p))
168  return -EINVAL;
169 
170  p = _osd_xdr_decode_data_map(p, &layout->olo_map);
171  layout->olo_comps_index = be32_to_cpup(p++);
172  layout->olo_num_comps = be32_to_cpup(p++);
173  dprintk("%s: olo_comps_index=%d olo_num_comps=%d\n", __func__,
174  layout->olo_comps_index, layout->olo_num_comps);
175 
176  iter->total_comps = layout->olo_num_comps;
177  return 0;
178 }
179 
181  struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr,
182  int *err)
183 {
184  BUG_ON(iter->decoded_comps > iter->total_comps);
185  if (iter->decoded_comps == iter->total_comps)
186  return false;
187 
188  *err = _osd_xdr_decode_object_cred(comp, xdr);
189  if (unlikely(*err)) {
190  dprintk("%s: _osd_xdr_decode_object_cred=>%d decoded_comps=%d "
191  "total_comps=%d\n", __func__, *err,
192  iter->decoded_comps, iter->total_comps);
193  return false; /* stop the loop */
194  }
195  dprintk("%s: dev(%llx:%llx) par=0x%llx obj=0x%llx "
196  "key_len=%u cap_len=%u\n",
197  __func__,
198  _DEVID_LO(&comp->oc_object_id.oid_device_id),
199  _DEVID_HI(&comp->oc_object_id.oid_device_id),
200  comp->oc_object_id.oid_partition_id,
201  comp->oc_object_id.oid_object_id,
202  comp->oc_cap_key.cred_len, comp->oc_cap.cred_len);
203 
204  iter->decoded_comps++;
205  return true;
206 }
207 
208 /*
209  * Get Device Information Decoding
210  *
211  * Note: since Device Information is currently done synchronously, all
212  * variable strings fields are left inside the rpc buffer and are only
213  * pointed to by the pnfs_osd_deviceaddr members. So the read buffer
214  * should not be freed while the returned information is in use.
215  */
216 /*
217  *struct nfs4_string {
218  * unsigned int len;
219  * char *data;
220  *}; // size [variable]
221  * NOTE: Returned string points to inside the XDR buffer
222  */
223 static __be32 *
224 __read_u8_opaque(__be32 *p, struct nfs4_string *str)
225 {
226  str->len = be32_to_cpup(p++);
227  str->data = (char *)p;
228 
229  p += XDR_QUADLEN(str->len);
230  return p;
231 }
232 
233 /*
234  * struct pnfs_osd_targetid {
235  * u32 oti_type;
236  * struct nfs4_string oti_scsi_device_id;
237  * };// size 4 + [variable]
238  */
239 static __be32 *
240 __read_targetid(__be32 *p, struct pnfs_osd_targetid* targetid)
241 {
242  u32 oti_type;
243 
244  oti_type = be32_to_cpup(p++);
245  targetid->oti_type = oti_type;
246 
247  switch (oti_type) {
250  p = __read_u8_opaque(p, &targetid->oti_scsi_device_id);
251  }
252 
253  return p;
254 }
255 
256 /*
257  * struct pnfs_osd_net_addr {
258  * struct nfs4_string r_netid;
259  * struct nfs4_string r_addr;
260  * };
261  */
262 static __be32 *
263 __read_net_addr(__be32 *p, struct pnfs_osd_net_addr* netaddr)
264 {
265  p = __read_u8_opaque(p, &netaddr->r_netid);
266  p = __read_u8_opaque(p, &netaddr->r_addr);
267 
268  return p;
269 }
270 
271 /*
272  * struct pnfs_osd_targetaddr {
273  * u32 ota_available;
274  * struct pnfs_osd_net_addr ota_netaddr;
275  * };
276  */
277 static __be32 *
278 __read_targetaddr(__be32 *p, struct pnfs_osd_targetaddr *targetaddr)
279 {
280  u32 ota_available;
281 
282  ota_available = be32_to_cpup(p++);
283  targetaddr->ota_available = ota_available;
284 
285  if (ota_available)
286  p = __read_net_addr(p, &targetaddr->ota_netaddr);
287 
288 
289  return p;
290 }
291 
292 /*
293  * struct pnfs_osd_deviceaddr {
294  * struct pnfs_osd_targetid oda_targetid;
295  * struct pnfs_osd_targetaddr oda_targetaddr;
296  * u8 oda_lun[8];
297  * struct nfs4_string oda_systemid;
298  * struct pnfs_osd_object_cred oda_root_obj_cred;
299  * struct nfs4_string oda_osdname;
300  * };
301  */
302 
303 /* We need this version for the pnfs_osd_xdr_decode_deviceaddr which does
304  * not have an xdr_stream
305  */
306 static __be32 *
307 __read_opaque_cred(__be32 *p,
308  struct pnfs_osd_opaque_cred *opaque_cred)
309 {
310  opaque_cred->cred_len = be32_to_cpu(*p++);
311  opaque_cred->cred = p;
312  return p + XDR_QUADLEN(opaque_cred->cred_len);
313 }
314 
315 static __be32 *
316 __read_object_cred(__be32 *p, struct pnfs_osd_object_cred *comp)
317 {
318  p = _osd_xdr_decode_objid(p, &comp->oc_object_id);
319  comp->oc_osd_version = be32_to_cpup(p++);
320  comp->oc_cap_key_sec = be32_to_cpup(p++);
321 
322  p = __read_opaque_cred(p, &comp->oc_cap_key);
323  p = __read_opaque_cred(p, &comp->oc_cap);
324  return p;
325 }
326 
328  struct pnfs_osd_deviceaddr *deviceaddr, __be32 *p)
329 {
330  p = __read_targetid(p, &deviceaddr->oda_targetid);
331 
332  p = __read_targetaddr(p, &deviceaddr->oda_targetaddr);
333 
334  p = xdr_decode_opaque_fixed(p, deviceaddr->oda_lun,
335  sizeof(deviceaddr->oda_lun));
336 
337  p = __read_u8_opaque(p, &deviceaddr->oda_systemid);
338 
339  p = __read_object_cred(p, &deviceaddr->oda_root_obj_cred);
340 
341  p = __read_u8_opaque(p, &deviceaddr->oda_osdname);
342 
343  /* libosd likes this terminated in dbg. It's last, so no problems */
344  deviceaddr->oda_osdname.data[deviceaddr->oda_osdname.len] = 0;
345 }
346 
347 /*
348  * struct pnfs_osd_layoutupdate {
349  * u32 dsu_valid;
350  * s64 dsu_delta;
351  * u32 olu_ioerr_flag;
352  * }; xdr size 4 + 8 + 4
353  */
354 int
355 pnfs_osd_xdr_encode_layoutupdate(struct xdr_stream *xdr,
356  struct pnfs_osd_layoutupdate *lou)
357 {
358  __be32 *p = xdr_reserve_space(xdr, 4 + 8 + 4);
359 
360  if (!p)
361  return -E2BIG;
362 
363  *p++ = cpu_to_be32(lou->dsu_valid);
364  if (lou->dsu_valid)
365  p = xdr_encode_hyper(p, lou->dsu_delta);
366  *p++ = cpu_to_be32(lou->olu_ioerr_flag);
367  return 0;
368 }
369 
370 /*
371  * struct pnfs_osd_objid {
372  * struct nfs4_deviceid oid_device_id;
373  * u64 oid_partition_id;
374  * u64 oid_object_id;
375  * }; // xdr size 32 bytes
376  */
377 static inline __be32 *
378 pnfs_osd_xdr_encode_objid(__be32 *p, struct pnfs_osd_objid *object_id)
379 {
380  p = xdr_encode_opaque_fixed(p, &object_id->oid_device_id.data,
381  sizeof(object_id->oid_device_id.data));
382  p = xdr_encode_hyper(p, object_id->oid_partition_id);
383  p = xdr_encode_hyper(p, object_id->oid_object_id);
384 
385  return p;
386 }
387 
388 /*
389  * struct pnfs_osd_ioerr {
390  * struct pnfs_osd_objid oer_component;
391  * u64 oer_comp_offset;
392  * u64 oer_comp_length;
393  * u32 oer_iswrite;
394  * u32 oer_errno;
395  * }; // xdr size 32 + 24 bytes
396  */
398 {
399  p = pnfs_osd_xdr_encode_objid(p, &ioerr->oer_component);
400  p = xdr_encode_hyper(p, ioerr->oer_comp_offset);
401  p = xdr_encode_hyper(p, ioerr->oer_comp_length);
402  *p++ = cpu_to_be32(ioerr->oer_iswrite);
403  *p = cpu_to_be32(ioerr->oer_errno);
404 }
405 
406 __be32 *pnfs_osd_xdr_ioerr_reserve_space(struct xdr_stream *xdr)
407 {
408  __be32 *p;
409 
410  p = xdr_reserve_space(xdr, 32 + 24);
411  if (unlikely(!p))
412  dprintk("%s: out of xdr space\n", __func__);
413 
414  return p;
415 }