fs/ocfs2/ioctl.c

   1 /*
   2  * linux/fs/ocfs2/ioctl.c
   3  *
   4  * Copyright (C) 2006 Herbert Poetzl
   5  * adapted from Remy Card's ext2/ioctl.c
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/mount.h>
  10 #include <linux/compat.h>
  11
  12 #define MLOG_MASK_PREFIX ML_INODE
  13 #include <cluster/masklog.h>
  14
  15 #include "ocfs2.h"
  16 #include "alloc.h"
  17 #include "dlmglue.h"
  18 #include "file.h"
  19 #include "inode.h"
  20 #include "journal.h"
  21
  22 #include "ocfs2_fs.h"
  23 #include "ioctl.h"
  24 #include "resize.h"
  25 #include "refcounttree.h"
  26
  27 #include <linux/ext2_fs.h>
  28
  29 #define o2info_from_user(a, b)  \
  30                 copy_from_user(&(a), (b), sizeof(a))
  31 #define o2info_to_user(a, b)    \
  32                 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
  33
  34 /*
  35  * This call is void because we are already reporting an error that may
  36  * be -EFAULT.  The error will be returned from the ioctl(2) call.  It's
  37  * just a best-effort to tell userspace that this request caused the error.
  38  */
  39 static inline void __o2info_set_request_error(struct ocfs2_info_request *kreq,
  40                                         struct ocfs2_info_request __user *req)
  41 {
  42         kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
  43         (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
  44 }
  45
  46 #define o2info_set_request_error(a, b) \
  47                 __o2info_set_request_error((struct ocfs2_info_request *)&(a), b)
  48
  49 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
  50 {
  51         int status;
  52
  53         status = ocfs2_inode_lock(inode, NULL, 0);
  54         if (status < 0) {
  55                 mlog_errno(status);
  56                 return status;
  57         }
  58         ocfs2_get_inode_flags(OCFS2_I(inode));
  59         *flags = OCFS2_I(inode)->ip_attr;
  60         ocfs2_inode_unlock(inode, 0);
  61
  62         mlog_exit(status);
  63         return status;
  64 }
  65
  66 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
  67                                 unsigned mask)
  68 {
  69         struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
  70         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  71         handle_t *handle = NULL;
  72         struct buffer_head *bh = NULL;
  73         unsigned oldflags;
  74         int status;
  75
  76         mutex_lock(&inode->i_mutex);
  77
  78         status = ocfs2_inode_lock(inode, &bh, 1);
  79         if (status < 0) {
  80                 mlog_errno(status);
  81                 goto bail;
  82         }
  83
  84         status = -EACCES;
  85         if (!inode_owner_or_capable(inode))
  86                 goto bail_unlock;
  87
  88         if (!S_ISDIR(inode->i_mode))
  89                 flags &= ~OCFS2_DIRSYNC_FL;
  90
  91         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
  92         if (IS_ERR(handle)) {
  93                 status = PTR_ERR(handle);
  94                 mlog_errno(status);
  95                 goto bail_unlock;
  96         }
  97
  98         oldflags = ocfs2_inode->ip_attr;
  99         flags = flags & mask;
 100         flags |= oldflags & ~mask;
 101
 102         /*
 103          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 104          * the relevant capability.
 105          */
 106         status = -EPERM;
 107         if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
 108                 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
 109                 if (!capable(CAP_LINUX_IMMUTABLE))
 110                         goto bail_unlock;
 111         }
 112
 113         ocfs2_inode->ip_attr = flags;
 114         ocfs2_set_inode_flags(inode);
 115
 116         status = ocfs2_mark_inode_dirty(handle, inode, bh);
 117         if (status < 0)
 118                 mlog_errno(status);
 119
 120         ocfs2_commit_trans(osb, handle);
 121 bail_unlock:
 122         ocfs2_inode_unlock(inode, 1);
 123 bail:
 124         mutex_unlock(&inode->i_mutex);
 125
 126         brelse(bh);
 127
 128         mlog_exit(status);
 129         return status;
 130 }
 131
 132 int ocfs2_info_handle_blocksize(struct inode *inode,
 133                                 struct ocfs2_info_request __user *req)
 134 {
 135         int status = -EFAULT;
 136         struct ocfs2_info_blocksize oib;
 137
 138         if (o2info_from_user(oib, req))
 139                 goto bail;
 140
 141         oib.ib_blocksize = inode->i_sb->s_blocksize;
 142         oib.ib_req.ir_flags |= OCFS2_INFO_FL_FILLED;
 143
 144         if (o2info_to_user(oib, req))
 145                 goto bail;
 146
 147         status = 0;
 148 bail:
 149         if (status)
 150                 o2info_set_request_error(oib, req);
 151
 152         return status;
 153 }
 154
 155 int ocfs2_info_handle_clustersize(struct inode *inode,
 156                                   struct ocfs2_info_request __user *req)
 157 {
 158         int status = -EFAULT;
 159         struct ocfs2_info_clustersize oic;
 160         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 161
 162         if (o2info_from_user(oic, req))
 163                 goto bail;
 164
 165         oic.ic_clustersize = osb->s_clustersize;
 166         oic.ic_req.ir_flags |= OCFS2_INFO_FL_FILLED;
 167
 168         if (o2info_to_user(oic, req))
 169                 goto bail;
 170
 171         status = 0;
 172 bail:
 173         if (status)
 174                 o2info_set_request_error(oic, req);
 175
 176         return status;
 177 }
 178
 179 int ocfs2_info_handle_maxslots(struct inode *inode,
 180                                struct ocfs2_info_request __user *req)
 181 {
 182         int status = -EFAULT;
 183         struct ocfs2_info_maxslots oim;
 184         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 185
 186         if (o2info_from_user(oim, req))
 187                 goto bail;
 188
 189         oim.im_max_slots = osb->max_slots;
 190         oim.im_req.ir_flags |= OCFS2_INFO_FL_FILLED;
 191
 192         if (o2info_to_user(oim, req))
 193                 goto bail;
 194
 195         status = 0;
 196 bail:
 197         if (status)
 198                 o2info_set_request_error(oim, req);
 199
 200         return status;
 201 }
 202
 203 int ocfs2_info_handle_label(struct inode *inode,
 204                             struct ocfs2_info_request __user *req)
 205 {
 206         int status = -EFAULT;
 207         struct ocfs2_info_label oil;
 208         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 209
 210         if (o2info_from_user(oil, req))
 211                 goto bail;
 212
 213         memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
 214         oil.il_req.ir_flags |= OCFS2_INFO_FL_FILLED;
 215
 216         if (o2info_to_user(oil, req))
 217                 goto bail;
 218
 219         status = 0;
 220 bail:
 221         if (status)
 222                 o2info_set_request_error(oil, req);
 223
 224         return status;
 225 }
 226
 227 int ocfs2_info_handle_uuid(struct inode *inode,
 228                            struct ocfs2_info_request __user *req)
 229 {
 230         int status = -EFAULT;
 231         struct ocfs2_info_uuid oiu;
 232         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 233
 234         if (o2info_from_user(oiu, req))
 235                 goto bail;
 236
 237         memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
 238         oiu.iu_req.ir_flags |= OCFS2_INFO_FL_FILLED;
 239
 240         if (o2info_to_user(oiu, req))
 241                 goto bail;
 242
 243         status = 0;
 244 bail:
 245         if (status)
 246                 o2info_set_request_error(oiu, req);
 247
 248         return status;
 249 }
 250
 251 int ocfs2_info_handle_fs_features(struct inode *inode,
 252                                   struct ocfs2_info_request __user *req)
 253 {
 254         int status = -EFAULT;
 255         struct ocfs2_info_fs_features oif;
 256         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 257
 258         if (o2info_from_user(oif, req))
 259                 goto bail;
 260
 261         oif.if_compat_features = osb->s_feature_compat;
 262         oif.if_incompat_features = osb->s_feature_incompat;
 263         oif.if_ro_compat_features = osb->s_feature_ro_compat;
 264         oif.if_req.ir_flags |= OCFS2_INFO_FL_FILLED;
 265
 266         if (o2info_to_user(oif, req))
 267                 goto bail;
 268
 269         status = 0;
 270 bail:
 271         if (status)
 272                 o2info_set_request_error(oif, req);
 273
 274         return status;
 275 }
 276
 277 int ocfs2_info_handle_journal_size(struct inode *inode,
 278                                    struct ocfs2_info_request __user *req)
 279 {
 280         int status = -EFAULT;
 281         struct ocfs2_info_journal_size oij;
 282         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 283
 284         if (o2info_from_user(oij, req))
 285                 goto bail;
 286
 287         oij.ij_journal_size = osb->journal->j_inode->i_size;
 288
 289         oij.ij_req.ir_flags |= OCFS2_INFO_FL_FILLED;
 290
 291         if (o2info_to_user(oij, req))
 292                 goto bail;
 293
 294         status = 0;
 295 bail:
 296         if (status)
 297                 o2info_set_request_error(oij, req);
 298
 299         return status;
 300 }
 301
 302 int ocfs2_info_handle_unknown(struct inode *inode,
 303                               struct ocfs2_info_request __user *req)
 304 {
 305         int status = -EFAULT;
 306         struct ocfs2_info_request oir;
 307
 308         if (o2info_from_user(oir, req))
 309                 goto bail;
 310
 311         oir.ir_flags &= ~OCFS2_INFO_FL_FILLED;
 312
 313         if (o2info_to_user(oir, req))
 314                 goto bail;
 315
 316         status = 0;
 317 bail:
 318         if (status)
 319                 o2info_set_request_error(oir, req);
 320
 321         return status;
 322 }
 323
 324 /*
 325  * Validate and distinguish OCFS2_IOC_INFO requests.
 326  *
 327  * - validate the magic number.
 328  * - distinguish different requests.
 329  * - validate size of different requests.
 330  */
 331 int ocfs2_info_handle_request(struct inode *inode,
 332                               struct ocfs2_info_request __user *req)
 333 {
 334         int status = -EFAULT;
 335         struct ocfs2_info_request oir;
 336
 337         if (o2info_from_user(oir, req))
 338                 goto bail;
 339
 340         status = -EINVAL;
 341         if (oir.ir_magic != OCFS2_INFO_MAGIC)
 342                 goto bail;
 343
 344         switch (oir.ir_code) {
 345         case OCFS2_INFO_BLOCKSIZE:
 346                 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
 347                         status = ocfs2_info_handle_blocksize(inode, req);
 348                 break;
 349         case OCFS2_INFO_CLUSTERSIZE:
 350                 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
 351                         status = ocfs2_info_handle_clustersize(inode, req);
 352                 break;
 353         case OCFS2_INFO_MAXSLOTS:
 354                 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
 355                         status = ocfs2_info_handle_maxslots(inode, req);
 356                 break;
 357         case OCFS2_INFO_LABEL:
 358                 if (oir.ir_size == sizeof(struct ocfs2_info_label))
 359                         status = ocfs2_info_handle_label(inode, req);
 360                 break;
 361         case OCFS2_INFO_UUID:
 362                 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
 363                         status = ocfs2_info_handle_uuid(inode, req);
 364                 break;
 365         case OCFS2_INFO_FS_FEATURES:
 366                 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
 367                         status = ocfs2_info_handle_fs_features(inode, req);
 368                 break;
 369         case OCFS2_INFO_JOURNAL_SIZE:
 370                 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
 371                         status = ocfs2_info_handle_journal_size(inode, req);
 372                 break;
 373         default:
 374                 status = ocfs2_info_handle_unknown(inode, req);
 375                 break;
 376         }
 377
 378 bail:
 379         return status;
 380 }
 381
 382 int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
 383                           u64 *req_addr, int compat_flag)
 384 {
 385         int status = -EFAULT;
 386         u64 __user *bp = NULL;
 387
 388         if (compat_flag) {
 389 #ifdef CONFIG_COMPAT
 390                 /*
 391                  * pointer bp stores the base address of a pointers array,
 392                  * which collects all addresses of separate request.
 393                  */
 394                 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
 395 #else
 396                 BUG();
 397 #endif
 398         } else
 399                 bp = (u64 __user *)(unsigned long)(info->oi_requests);
 400
 401         if (o2info_from_user(*req_addr, bp + idx))
 402                 goto bail;
 403
 404         status = 0;
 405 bail:
 406         return status;
 407 }
 408
 409 /*
 410  * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 411  *
 412  * ocfs2_info_handle() recevies a large info aggregation, grab and
 413  * validate the request count from header, then break it into small
 414  * pieces, later specific handlers can handle them one by one.
 415  *
 416  * Idea here is to make each separate request small enough to ensure
 417  * a better backward&forward compatibility, since a small piece of
 418  * request will be less likely to be broken if disk layout get changed.
 419  */
 420 int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
 421                       int compat_flag)
 422 {
 423         int i, status = 0;
 424         u64 req_addr;
 425         struct ocfs2_info_request __user *reqp;
 426
 427         if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
 428             (!info->oi_requests)) {
 429                 status = -EINVAL;
 430                 goto bail;
 431         }
 432
 433         for (i = 0; i < info->oi_count; i++) {
 434
 435                 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
 436                 if (status)
 437                         break;
 438
 439                 reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
 440                 if (!reqp) {
 441                         status = -EINVAL;
 442                         goto bail;
 443                 }
 444
 445                 status = ocfs2_info_handle_request(inode, reqp);
 446                 if (status)
 447                         break;
 448         }
 449
 450 bail:
 451         return status;
 452 }
 453
 454 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 455 {
 456         struct inode *inode = filp->f_path.dentry->d_inode;
 457         unsigned int flags;
 458         int new_clusters;
 459         int status;
 460         struct ocfs2_space_resv sr;
 461         struct ocfs2_new_group_input input;
 462         struct reflink_arguments args;
 463         const char *old_path, *new_path;
 464         bool preserve;
 465         struct ocfs2_info info;
 466
 467         switch (cmd) {
 468         case OCFS2_IOC_GETFLAGS:
 469                 status = ocfs2_get_inode_attr(inode, &flags);
 470                 if (status < 0)
 471                         return status;
 472
 473                 flags &= OCFS2_FL_VISIBLE;
 474                 return put_user(flags, (int __user *) arg);
 475         case OCFS2_IOC_SETFLAGS:
 476                 if (get_user(flags, (int __user *) arg))
 477                         return -EFAULT;
 478
 479                 status = mnt_want_write(filp->f_path.mnt);
 480                 if (status)
 481                         return status;
 482                 status = ocfs2_set_inode_attr(inode, flags,
 483                         OCFS2_FL_MODIFIABLE);
 484                 mnt_drop_write(filp->f_path.mnt);
 485                 return status;
 486         case OCFS2_IOC_RESVSP:
 487         case OCFS2_IOC_RESVSP64:
 488         case OCFS2_IOC_UNRESVSP:
 489         case OCFS2_IOC_UNRESVSP64:
 490                 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
 491                         return -EFAULT;
 492
 493                 return ocfs2_change_file_space(filp, cmd, &sr);
 494         case OCFS2_IOC_GROUP_EXTEND:
 495                 if (!capable(CAP_SYS_RESOURCE))
 496                         return -EPERM;
 497
 498                 if (get_user(new_clusters, (int __user *)arg))
 499                         return -EFAULT;
 500
 501                 return ocfs2_group_extend(inode, new_clusters);
 502         case OCFS2_IOC_GROUP_ADD:
 503         case OCFS2_IOC_GROUP_ADD64:
 504                 if (!capable(CAP_SYS_RESOURCE))
 505                         return -EPERM;
 506
 507                 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
 508                         return -EFAULT;
 509
 510                 return ocfs2_group_add(inode, &input);
 511         case OCFS2_IOC_REFLINK:
 512                 if (copy_from_user(&args, (struct reflink_arguments *)arg,
 513                                    sizeof(args)))
 514                         return -EFAULT;
 515                 old_path = (const char *)(unsigned long)args.old_path;
 516                 new_path = (const char *)(unsigned long)args.new_path;
 517                 preserve = (args.preserve != 0);
 518
 519                 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
 520         case OCFS2_IOC_INFO:
 521                 if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
 522                                    sizeof(struct ocfs2_info)))
 523                         return -EFAULT;
 524
 525                 return ocfs2_info_handle(inode, &info, 0);
 526         default:
 527                 return -ENOTTY;
 528         }
 529 }
 530
 531 #ifdef CONFIG_COMPAT
 532 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 533 {
 534         bool preserve;
 535         struct reflink_arguments args;
 536         struct inode *inode = file->f_path.dentry->d_inode;
 537         struct ocfs2_info info;
 538
 539         switch (cmd) {
 540         case OCFS2_IOC32_GETFLAGS:
 541                 cmd = OCFS2_IOC_GETFLAGS;
 542                 break;
 543         case OCFS2_IOC32_SETFLAGS:
 544                 cmd = OCFS2_IOC_SETFLAGS;
 545                 break;
 546         case OCFS2_IOC_RESVSP:
 547         case OCFS2_IOC_RESVSP64:
 548         case OCFS2_IOC_UNRESVSP:
 549         case OCFS2_IOC_UNRESVSP64:
 550         case OCFS2_IOC_GROUP_EXTEND:
 551         case OCFS2_IOC_GROUP_ADD:
 552         case OCFS2_IOC_GROUP_ADD64:
 553                 break;
 554         case OCFS2_IOC_REFLINK:
 555                 if (copy_from_user(&args, (struct reflink_arguments *)arg,
 556                                    sizeof(args)))
 557                         return -EFAULT;
 558                 preserve = (args.preserve != 0);
 559
 560                 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
 561                                            compat_ptr(args.new_path), preserve);
 562         case OCFS2_IOC_INFO:
 563                 if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
 564                                    sizeof(struct ocfs2_info)))
 565                         return -EFAULT;
 566
 567                 return ocfs2_info_handle(inode, &info, 1);
 568         default:
 569                 return -ENOIOCTLCMD;
 570         }
 571
 572         return ocfs2_ioctl(file, cmd, arg);
 573 }
 574 #endif