SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/exofs/ios.c

   1 /*
   2  * Copyright (C) 2005, 2006
   3  * Avishay Traeger (avishay@gmail.com)
   4  * Copyright (C) 2008, 2009
   5  * Boaz Harrosh <bharrosh@panasas.com>
   6  *
   7  * This file is part of exofs.
   8  *
   9  * exofs is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation.  Since it is based on ext2, and the only
  12  * valid version of GPL for the Linux kernel is version 2, the only valid
  13  * version of GPL for exofs is version 2.
  14  *
  15  * exofs is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with exofs; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  23  */
  24
  25 #include <scsi/scsi_device.h>
  26
  27 #include "exofs.h"
  28
  29 #define EXOFS_DBGMSG2(M...) do {} while (0)
  30 /* #define EXOFS_DBGMSG2 EXOFS_DBGMSG */
  31
  32 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
  33 {
  34         osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
  35 }
  36
  37 int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
  38                     u64 offset, void *p, unsigned length)
  39 {
  40         struct osd_request *or = osd_start_request(od, GFP_KERNEL);
  41 /*      struct osd_sense_info osi = {.key = 0};*/
  42         int ret;
  43
  44         if (unlikely(!or)) {
  45                 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
  46                 return -ENOMEM;
  47         }
  48         ret = osd_req_read_kern(or, obj, offset, p, length);
  49         if (unlikely(ret)) {
  50                 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
  51                 goto out;
  52         }
  53
  54         ret = osd_finalize_request(or, 0, cred, NULL);
  55         if (unlikely(ret)) {
  56                 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
  57                 goto out;
  58         }
  59
  60         ret = osd_execute_request(or);
  61         if (unlikely(ret))
  62                 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
  63         /* osd_req_decode_sense(or, ret); */
  64
  65 out:
  66         osd_end_request(or);
  67         return ret;
  68 }
  69
  70 int exofs_get_io_state(struct exofs_sb_info *sbi, struct exofs_io_state** pios)
  71 {
  72         struct exofs_io_state *ios;
  73
  74         /*TODO: Maybe use kmem_cach per sbi of size
  75          * exofs_io_state_size(sbi->s_numdevs)
  76          */
  77         ios = kzalloc(exofs_io_state_size(sbi->s_numdevs), GFP_KERNEL);
  78         if (unlikely(!ios)) {
  79                 EXOFS_DBGMSG("Faild kzalloc bytes=%d\n",
  80                              exofs_io_state_size(sbi->s_numdevs));
  81                 *pios = NULL;
  82                 return -ENOMEM;
  83         }
  84
  85         ios->sbi = sbi;
  86         ios->obj.partition = sbi->s_pid;
  87         *pios = ios;
  88         return 0;
  89 }
  90
  91 void exofs_put_io_state(struct exofs_io_state *ios)
  92 {
  93         if (ios) {
  94                 unsigned i;
  95
  96                 for (i = 0; i < ios->numdevs; i++) {
  97                         struct exofs_per_dev_state *per_dev = &ios->per_dev[i];
  98
  99                         if (per_dev->or)
 100                                 osd_end_request(per_dev->or);
 101                         if (per_dev->bio)
 102                                 bio_put(per_dev->bio);
 103                 }
 104
 105                 kfree(ios);
 106         }
 107 }
 108
 109 static void _sync_done(struct exofs_io_state *ios, void *p)
 110 {
 111         struct completion *waiting = p;
 112
 113         complete(waiting);
 114 }
 115
 116 static void _last_io(struct kref *kref)
 117 {
 118         struct exofs_io_state *ios = container_of(
 119                                         kref, struct exofs_io_state, kref);
 120
 121         ios->done(ios, ios->private);
 122 }
 123
 124 static void _done_io(struct osd_request *or, void *p)
 125 {
 126         struct exofs_io_state *ios = p;
 127
 128         kref_put(&ios->kref, _last_io);
 129 }
 130
 131 static int exofs_io_execute(struct exofs_io_state *ios)
 132 {
 133         DECLARE_COMPLETION_ONSTACK(wait);
 134         bool sync = (ios->done == NULL);
 135         int i, ret;
 136
 137         if (sync) {
 138                 ios->done = _sync_done;
 139                 ios->private = &wait;
 140         }
 141
 142         for (i = 0; i < ios->numdevs; i++) {
 143                 struct osd_request *or = ios->per_dev[i].or;
 144                 if (unlikely(!or))
 145                         continue;
 146
 147                 ret = osd_finalize_request(or, 0, ios->cred, NULL);
 148                 if (unlikely(ret)) {
 149                         EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
 150                                      ret);
 151                         return ret;
 152                 }
 153         }
 154
 155         kref_init(&ios->kref);
 156
 157         for (i = 0; i < ios->numdevs; i++) {
 158                 struct osd_request *or = ios->per_dev[i].or;
 159                 if (unlikely(!or))
 160                         continue;
 161
 162                 kref_get(&ios->kref);
 163                 osd_execute_request_async(or, _done_io, ios);
 164         }
 165
 166         kref_put(&ios->kref, _last_io);
 167         ret = 0;
 168
 169         if (sync) {
 170                 wait_for_completion(&wait);
 171                 ret = exofs_check_io(ios, NULL);
 172         }
 173         return ret;
 174 }
 175
 176 int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
 177 {
 178         enum osd_err_priority acumulated_osd_err = 0;
 179         int acumulated_lin_err = 0;
 180         int i;
 181
 182         for (i = 0; i < ios->numdevs; i++) {
 183                 struct osd_sense_info osi;
 184                 int ret = osd_req_decode_sense(ios->per_dev[i].or, &osi);
 185
 186                 if (likely(!ret))
 187                         continue;
 188
 189                 if (unlikely(ret == -EFAULT)) {
 190                         EXOFS_DBGMSG("%s: EFAULT Need page clear\n", __func__);
 191                         /*FIXME: All the pages in this device range should:
 192                          *      clear_highpage(page);
 193                          */
 194                 }
 195
 196                 if (osi.osd_err_pri >= acumulated_osd_err) {
 197                         acumulated_osd_err = osi.osd_err_pri;
 198                         acumulated_lin_err = ret;
 199                 }
 200         }
 201
 202         /* TODO: raid specific residual calculations */
 203         if (resid) {
 204                 if (likely(!acumulated_lin_err))
 205                         *resid = 0;
 206                 else
 207                         *resid = ios->length;
 208         }
 209
 210         return acumulated_lin_err;
 211 }
 212
 213 int exofs_sbi_create(struct exofs_io_state *ios)
 214 {
 215         int i, ret;
 216
 217         for (i = 0; i < ios->sbi->s_numdevs; i++) {
 218                 struct osd_request *or;
 219
 220                 or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
 221                 if (unlikely(!or)) {
 222                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 223                         ret = -ENOMEM;
 224                         goto out;
 225                 }
 226                 ios->per_dev[i].or = or;
 227                 ios->numdevs++;
 228
 229                 osd_req_create_object(or, &ios->obj);
 230         }
 231         ret = exofs_io_execute(ios);
 232
 233 out:
 234         return ret;
 235 }
 236
 237 int exofs_sbi_remove(struct exofs_io_state *ios)
 238 {
 239         int i, ret;
 240
 241         for (i = 0; i < ios->sbi->s_numdevs; i++) {
 242                 struct osd_request *or;
 243
 244                 or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
 245                 if (unlikely(!or)) {
 246                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 247                         ret = -ENOMEM;
 248                         goto out;
 249                 }
 250                 ios->per_dev[i].or = or;
 251                 ios->numdevs++;
 252
 253                 osd_req_remove_object(or, &ios->obj);
 254         }
 255         ret = exofs_io_execute(ios);
 256
 257 out:
 258         return ret;
 259 }
 260
 261 int exofs_sbi_write(struct exofs_io_state *ios)
 262 {
 263         int i, ret;
 264
 265         for (i = 0; i < ios->sbi->s_numdevs; i++) {
 266                 struct osd_request *or;
 267
 268                 or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
 269                 if (unlikely(!or)) {
 270                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 271                         ret = -ENOMEM;
 272                         goto out;
 273                 }
 274                 ios->per_dev[i].or = or;
 275                 ios->numdevs++;
 276
 277                 if (ios->bio) {
 278                         struct bio *bio;
 279
 280                         if (i != 0) {
 281                                 bio = bio_kmalloc(GFP_KERNEL,
 282                                                   ios->bio->bi_max_vecs);
 283                                 if (unlikely(!bio)) {
 284                                         EXOFS_DBGMSG(
 285                                               "Faild to allocate BIO size=%u\n",
 286                                               ios->bio->bi_max_vecs);
 287                                         ret = -ENOMEM;
 288                                         goto out;
 289                                 }
 290
 291                                 __bio_clone(bio, ios->bio);
 292                                 bio->bi_bdev = NULL;
 293                                 bio->bi_next = NULL;
 294                                 ios->per_dev[i].bio =  bio;
 295                         } else {
 296                                 bio = ios->bio;
 297                         }
 298
 299                         osd_req_write(or, &ios->obj, ios->offset, bio,
 300                                       ios->length);
 301                         EXOFS_DBGMSG("write(0x%llx) offset=0x%llx "
 302                                       "length=0x%llx dev=%d\n",
 303                                      _LLU(ios->obj.id), _LLU(ios->offset),
 304                                      _LLU(ios->length), i);
 305                 } else if (ios->kern_buff) {
 306                         osd_req_write_kern(or, &ios->obj, ios->offset,
 307                                            ios->kern_buff, ios->length);
 308                         EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
 309                                       "length=0x%llx dev=%d\n",
 310                                      _LLU(ios->obj.id), _LLU(ios->offset),
 311                                      _LLU(ios->length), i);
 312                 } else {
 313                         osd_req_set_attributes(or, &ios->obj);
 314                         EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
 315                                      _LLU(ios->obj.id), ios->out_attr_len, i);
 316                 }
 317
 318                 if (ios->out_attr)
 319                         osd_req_add_set_attr_list(or, ios->out_attr,
 320                                                   ios->out_attr_len);
 321
 322                 if (ios->in_attr)
 323                         osd_req_add_get_attr_list(or, ios->in_attr,
 324                                                   ios->in_attr_len);
 325         }
 326         ret = exofs_io_execute(ios);
 327
 328 out:
 329         return ret;
 330 }
 331
 332 int exofs_sbi_read(struct exofs_io_state *ios)
 333 {
 334         int i, ret;
 335
 336         for (i = 0; i < 1; i++) {
 337                 struct osd_request *or;
 338                 unsigned first_dev = (unsigned)ios->obj.id;
 339
 340                 first_dev %= ios->sbi->s_numdevs;
 341                 or = osd_start_request(ios->sbi->s_ods[first_dev], GFP_KERNEL);
 342                 if (unlikely(!or)) {
 343                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 344                         ret = -ENOMEM;
 345                         goto out;
 346                 }
 347                 ios->per_dev[i].or = or;
 348                 ios->numdevs++;
 349
 350                 if (ios->bio) {
 351                         osd_req_read(or, &ios->obj, ios->offset, ios->bio,
 352                                      ios->length);
 353                         EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
 354                                       " dev=%d\n", _LLU(ios->obj.id),
 355                                      _LLU(ios->offset),
 356                                      _LLU(ios->length),
 357                                      first_dev);
 358                 } else if (ios->kern_buff) {
 359                         osd_req_read_kern(or, &ios->obj, ios->offset,
 360                                            ios->kern_buff, ios->length);
 361                         EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
 362                                       "length=0x%llx dev=%d\n",
 363                                      _LLU(ios->obj.id),
 364                                      _LLU(ios->offset),
 365                                      _LLU(ios->length),
 366                                      first_dev);
 367                 } else {
 368                         osd_req_get_attributes(or, &ios->obj);
 369                         EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
 370                                      _LLU(ios->obj.id), ios->in_attr_len,
 371                                      first_dev);
 372                 }
 373
 374                 if (ios->out_attr)
 375                         osd_req_add_set_attr_list(or, ios->out_attr,
 376                                                   ios->out_attr_len);
 377
 378                 if (ios->in_attr)
 379                         osd_req_add_get_attr_list(or, ios->in_attr,
 380                                                   ios->in_attr_len);
 381         }
 382         ret = exofs_io_execute(ios);
 383
 384 out:
 385         return ret;
 386 }
 387
 388 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
 389 {
 390         struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
 391         void *iter = NULL;
 392         int nelem;
 393
 394         do {
 395                 nelem = 1;
 396                 osd_req_decode_get_attr_list(ios->per_dev[0].or,
 397                                              &cur_attr, &nelem, &iter);
 398                 if ((cur_attr.attr_page == attr->attr_page) &&
 399                     (cur_attr.attr_id == attr->attr_id)) {
 400                         attr->len = cur_attr.len;
 401                         attr->val_ptr = cur_attr.val_ptr;
 402                         return 0;
 403                 }
 404         } while (iter);
 405
 406         return -EIO;
 407 }
 408
 409 int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
 410 {
 411         struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
 412         struct exofs_io_state *ios;
 413         struct osd_attr attr;
 414         __be64 newsize;
 415         int i, ret;
 416
 417         if (exofs_get_io_state(sbi, &ios))
 418                 return -ENOMEM;
 419
 420         ios->obj.id = exofs_oi_objno(oi);
 421         ios->cred = oi->i_cred;
 422
 423         newsize = cpu_to_be64(size);
 424         attr = g_attr_logical_length;
 425         attr.val_ptr = &newsize;
 426
 427         for (i = 0; i < sbi->s_numdevs; i++) {
 428                 struct osd_request *or;
 429
 430                 or = osd_start_request(sbi->s_ods[i], GFP_KERNEL);
 431                 if (unlikely(!or)) {
 432                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 433                         ret = -ENOMEM;
 434                         goto out;
 435                 }
 436                 ios->per_dev[i].or = or;
 437                 ios->numdevs++;
 438
 439                 osd_req_set_attributes(or, &ios->obj);
 440                 osd_req_add_set_attr_list(or, &attr, 1);
 441         }
 442         ret = exofs_io_execute(ios);
 443
 444 out:
 445         exofs_put_io_state(ios);
 446         return ret;
 447 }