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_layout *layout,
  71                        struct exofs_io_state **pios)
  72 {
  73         struct exofs_io_state *ios;
  74
  75         /*TODO: Maybe use kmem_cach per sbi of size
  76          * exofs_io_state_size(layout->s_numdevs)
  77          */
  78         ios = kzalloc(exofs_io_state_size(layout->s_numdevs), GFP_KERNEL);
  79         if (unlikely(!ios)) {
  80                 EXOFS_DBGMSG("Faild kzalloc bytes=%d\n",
  81                              exofs_io_state_size(layout->s_numdevs));
  82                 *pios = NULL;
  83                 return -ENOMEM;
  84         }
  85
  86         ios->layout = layout;
  87         ios->obj.partition = layout->s_pid;
  88         *pios = ios;
  89         return 0;
  90 }
  91
  92 void exofs_put_io_state(struct exofs_io_state *ios)
  93 {
  94         if (ios) {
  95                 unsigned i;
  96
  97                 for (i = 0; i < ios->numdevs; i++) {
  98                         struct exofs_per_dev_state *per_dev = &ios->per_dev[i];
  99
 100                         if (per_dev->or)
 101                                 osd_end_request(per_dev->or);
 102                         if (per_dev->bio)
 103                                 bio_put(per_dev->bio);
 104                 }
 105
 106                 kfree(ios);
 107         }
 108 }
 109
 110 static void _sync_done(struct exofs_io_state *ios, void *p)
 111 {
 112         struct completion *waiting = p;
 113
 114         complete(waiting);
 115 }
 116
 117 static void _last_io(struct kref *kref)
 118 {
 119         struct exofs_io_state *ios = container_of(
 120                                         kref, struct exofs_io_state, kref);
 121
 122         ios->done(ios, ios->private);
 123 }
 124
 125 static void _done_io(struct osd_request *or, void *p)
 126 {
 127         struct exofs_io_state *ios = p;
 128
 129         kref_put(&ios->kref, _last_io);
 130 }
 131
 132 static int exofs_io_execute(struct exofs_io_state *ios)
 133 {
 134         DECLARE_COMPLETION_ONSTACK(wait);
 135         bool sync = (ios->done == NULL);
 136         int i, ret;
 137
 138         if (sync) {
 139                 ios->done = _sync_done;
 140                 ios->private = &wait;
 141         }
 142
 143         for (i = 0; i < ios->numdevs; i++) {
 144                 struct osd_request *or = ios->per_dev[i].or;
 145                 if (unlikely(!or))
 146                         continue;
 147
 148                 ret = osd_finalize_request(or, 0, ios->cred, NULL);
 149                 if (unlikely(ret)) {
 150                         EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
 151                                      ret);
 152                         return ret;
 153                 }
 154         }
 155
 156         kref_init(&ios->kref);
 157
 158         for (i = 0; i < ios->numdevs; i++) {
 159                 struct osd_request *or = ios->per_dev[i].or;
 160                 if (unlikely(!or))
 161                         continue;
 162
 163                 kref_get(&ios->kref);
 164                 osd_execute_request_async(or, _done_io, ios);
 165         }
 166
 167         kref_put(&ios->kref, _last_io);
 168         ret = 0;
 169
 170         if (sync) {
 171                 wait_for_completion(&wait);
 172                 ret = exofs_check_io(ios, NULL);
 173         }
 174         return ret;
 175 }
 176
 177 static void _clear_bio(struct bio *bio)
 178 {
 179         struct bio_vec *bv;
 180         unsigned i;
 181
 182         __bio_for_each_segment(bv, bio, i, 0) {
 183                 unsigned this_count = bv->bv_len;
 184
 185                 if (likely(PAGE_SIZE == this_count))
 186                         clear_highpage(bv->bv_page);
 187                 else
 188                         zero_user(bv->bv_page, bv->bv_offset, this_count);
 189         }
 190 }
 191
 192 int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
 193 {
 194         enum osd_err_priority acumulated_osd_err = 0;
 195         int acumulated_lin_err = 0;
 196         int i;
 197
 198         for (i = 0; i < ios->numdevs; i++) {
 199                 struct osd_sense_info osi;
 200                 struct osd_request *or = ios->per_dev[i].or;
 201                 int ret;
 202
 203                 if (unlikely(!or))
 204                         continue;
 205
 206                 ret = osd_req_decode_sense(or, &osi);
 207                 if (likely(!ret))
 208                         continue;
 209
 210                 if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
 211                         /* start read offset passed endof file */
 212                         _clear_bio(ios->per_dev[i].bio);
 213                         EXOFS_DBGMSG("start read offset passed end of file "
 214                                 "offset=0x%llx, length=0x%llx\n",
 215                                 _LLU(ios->offset),
 216                                 _LLU(ios->length));
 217
 218                         continue; /* we recovered */
 219                 }
 220
 221                 if (osi.osd_err_pri >= acumulated_osd_err) {
 222                         acumulated_osd_err = osi.osd_err_pri;
 223                         acumulated_lin_err = ret;
 224                 }
 225         }
 226
 227         /* TODO: raid specific residual calculations */
 228         if (resid) {
 229                 if (likely(!acumulated_lin_err))
 230                         *resid = 0;
 231                 else
 232                         *resid = ios->length;
 233         }
 234
 235         return acumulated_lin_err;
 236 }
 237
 238 int exofs_sbi_create(struct exofs_io_state *ios)
 239 {
 240         int i, ret;
 241
 242         for (i = 0; i < ios->layout->s_numdevs; i++) {
 243                 struct osd_request *or;
 244
 245                 or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL);
 246                 if (unlikely(!or)) {
 247                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 248                         ret = -ENOMEM;
 249                         goto out;
 250                 }
 251                 ios->per_dev[i].or = or;
 252                 ios->numdevs++;
 253
 254                 osd_req_create_object(or, &ios->obj);
 255         }
 256         ret = exofs_io_execute(ios);
 257
 258 out:
 259         return ret;
 260 }
 261
 262 int exofs_sbi_remove(struct exofs_io_state *ios)
 263 {
 264         int i, ret;
 265
 266         for (i = 0; i < ios->layout->s_numdevs; i++) {
 267                 struct osd_request *or;
 268
 269                 or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL);
 270                 if (unlikely(!or)) {
 271                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 272                         ret = -ENOMEM;
 273                         goto out;
 274                 }
 275                 ios->per_dev[i].or = or;
 276                 ios->numdevs++;
 277
 278                 osd_req_remove_object(or, &ios->obj);
 279         }
 280         ret = exofs_io_execute(ios);
 281
 282 out:
 283         return ret;
 284 }
 285
 286 int exofs_sbi_write(struct exofs_io_state *ios)
 287 {
 288         int i, ret;
 289
 290         for (i = 0; i < ios->layout->s_numdevs; i++) {
 291                 struct osd_request *or;
 292
 293                 or = osd_start_request(ios->layout->s_ods[i], GFP_KERNEL);
 294                 if (unlikely(!or)) {
 295                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 296                         ret = -ENOMEM;
 297                         goto out;
 298                 }
 299                 ios->per_dev[i].or = or;
 300                 ios->numdevs++;
 301
 302                 if (ios->bio) {
 303                         struct bio *bio;
 304
 305                         if (i != 0) {
 306                                 bio = bio_kmalloc(GFP_KERNEL,
 307                                                   ios->bio->bi_max_vecs);
 308                                 if (unlikely(!bio)) {
 309                                         EXOFS_DBGMSG(
 310                                               "Faild to allocate BIO size=%u\n",
 311                                               ios->bio->bi_max_vecs);
 312                                         ret = -ENOMEM;
 313                                         goto out;
 314                                 }
 315
 316                                 __bio_clone(bio, ios->bio);
 317                                 bio->bi_bdev = NULL;
 318                                 bio->bi_next = NULL;
 319                                 ios->per_dev[i].bio =  bio;
 320                         } else {
 321                                 bio = ios->bio;
 322                         }
 323
 324                         osd_req_write(or, &ios->obj, ios->offset, bio,
 325                                       ios->length);
 326                         EXOFS_DBGMSG("write(0x%llx) offset=0x%llx "
 327                                       "length=0x%llx dev=%d\n",
 328                                      _LLU(ios->obj.id), _LLU(ios->offset),
 329                                      _LLU(ios->length), i);
 330                 } else if (ios->kern_buff) {
 331                         osd_req_write_kern(or, &ios->obj, ios->offset,
 332                                            ios->kern_buff, ios->length);
 333                         EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
 334                                       "length=0x%llx dev=%d\n",
 335                                      _LLU(ios->obj.id), _LLU(ios->offset),
 336                                      _LLU(ios->length), i);
 337                 } else {
 338                         osd_req_set_attributes(or, &ios->obj);
 339                         EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
 340                                      _LLU(ios->obj.id), ios->out_attr_len, i);
 341                 }
 342
 343                 if (ios->out_attr)
 344                         osd_req_add_set_attr_list(or, ios->out_attr,
 345                                                   ios->out_attr_len);
 346
 347                 if (ios->in_attr)
 348                         osd_req_add_get_attr_list(or, ios->in_attr,
 349                                                   ios->in_attr_len);
 350         }
 351         ret = exofs_io_execute(ios);
 352
 353 out:
 354         return ret;
 355 }
 356
 357 int exofs_sbi_read(struct exofs_io_state *ios)
 358 {
 359         struct osd_request *or;
 360         struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
 361         unsigned first_dev = (unsigned)ios->obj.id;
 362
 363         first_dev %= ios->layout->s_numdevs;
 364         or = osd_start_request(ios->layout->s_ods[first_dev], GFP_KERNEL);
 365         if (unlikely(!or)) {
 366                 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 367                 return -ENOMEM;
 368         }
 369         per_dev->or = or;
 370         ios->numdevs++;
 371
 372         if (ios->bio) {
 373                 osd_req_read(or, &ios->obj, ios->offset, ios->bio, ios->length);
 374                 EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
 375                              " dev=%d\n", _LLU(ios->obj.id),
 376                              _LLU(ios->offset), _LLU(ios->length),
 377                              first_dev);
 378         } else if (ios->kern_buff) {
 379                 int ret = osd_req_read_kern(or, &ios->obj, ios->offset,
 380                                             ios->kern_buff, ios->length);
 381
 382                 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
 383                               "length=0x%llx dev=%d ret=>%d\n",
 384                               _LLU(ios->obj.id), _LLU(ios->offset),
 385                               _LLU(ios->length), first_dev, ret);
 386                 if (unlikely(ret))
 387                         return ret;
 388         } else {
 389                 osd_req_get_attributes(or, &ios->obj);
 390                 EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
 391                               _LLU(ios->obj.id), ios->in_attr_len, first_dev);
 392         }
 393
 394         if (ios->out_attr)
 395                 osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len);
 396
 397         if (ios->in_attr)
 398                 osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
 399
 400         return exofs_io_execute(ios);
 401 }
 402
 403 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
 404 {
 405         struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
 406         void *iter = NULL;
 407         int nelem;
 408
 409         do {
 410                 nelem = 1;
 411                 osd_req_decode_get_attr_list(ios->per_dev[0].or,
 412                                              &cur_attr, &nelem, &iter);
 413                 if ((cur_attr.attr_page == attr->attr_page) &&
 414                     (cur_attr.attr_id == attr->attr_id)) {
 415                         attr->len = cur_attr.len;
 416                         attr->val_ptr = cur_attr.val_ptr;
 417                         return 0;
 418                 }
 419         } while (iter);
 420
 421         return -EIO;
 422 }
 423
 424 int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
 425 {
 426         struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
 427         struct exofs_io_state *ios;
 428         struct osd_attr attr;
 429         __be64 newsize;
 430         int i, ret;
 431
 432         if (exofs_get_io_state(&sbi->layout, &ios))
 433                 return -ENOMEM;
 434
 435         ios->obj.id = exofs_oi_objno(oi);
 436         ios->cred = oi->i_cred;
 437
 438         newsize = cpu_to_be64(size);
 439         attr = g_attr_logical_length;
 440         attr.val_ptr = &newsize;
 441
 442         for (i = 0; i < sbi->layout.s_numdevs; i++) {
 443                 struct osd_request *or;
 444
 445                 or = osd_start_request(sbi->layout.s_ods[i], GFP_KERNEL);
 446                 if (unlikely(!or)) {
 447                         EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 448                         ret = -ENOMEM;
 449                         goto out;
 450                 }
 451                 ios->per_dev[i].or = or;
 452                 ios->numdevs++;
 453
 454                 osd_req_set_attributes(or, &ios->obj);
 455                 osd_req_add_set_attr_list(or, &attr, 1);
 456         }
 457         ret = exofs_io_execute(ios);
 458
 459 out:
 460         exofs_put_io_state(ios);
 461         return ret;
 462 }