1 /* 2 * linux/fs/ext4/ioctl.c 3 * 4 * Copyright (C) 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 */ 9 10 #include <linux/fs.h> 11 #include <linux/jbd2.h> 12 #include <linux/capability.h> 13 #include <linux/time.h> 14 #include <linux/compat.h> 15 #include <linux/mount.h> 16 #include <linux/file.h> 17 #include <asm/uaccess.h> 18 #include "ext4_jbd2.h" 19 #include "ext4.h" 20 21 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1) 22 23 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 24 { 25 struct inode *inode = file_inode(filp); 26 struct super_block *sb = inode->i_sb; 27 struct ext4_inode_info *ei = EXT4_I(inode); 28 unsigned int flags; 29 30 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 31 32 switch (cmd) { 33 case EXT4_IOC_GETFLAGS: 34 ext4_get_inode_flags(ei); 35 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 36 return put_user(flags, (int __user *) arg); 37 case EXT4_IOC_SETFLAGS: { 38 handle_t *handle = NULL; 39 int err, migrate = 0; 40 struct ext4_iloc iloc; 41 unsigned int oldflags, mask, i; 42 unsigned int jflag; 43 44 if (!inode_owner_or_capable(inode)) 45 return -EACCES; 46 47 if (get_user(flags, (int __user *) arg)) 48 return -EFAULT; 49 50 err = mnt_want_write_file(filp); 51 if (err) 52 return err; 53 54 flags = ext4_mask_flags(inode->i_mode, flags); 55 56 err = -EPERM; 57 mutex_lock(&inode->i_mutex); 58 /* Is it quota file? Do not allow user to mess with it */ 59 if (IS_NOQUOTA(inode)) 60 goto flags_out; 61 62 oldflags = ei->i_flags; 63 64 /* The JOURNAL_DATA flag is modifiable only by root */ 65 jflag = flags & EXT4_JOURNAL_DATA_FL; 66 67 /* 68 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 69 * the relevant capability. 70 * 71 * This test looks nicer. Thanks to Pauline Middelink 72 */ 73 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { 74 if (!capable(CAP_LINUX_IMMUTABLE)) 75 goto flags_out; 76 } 77 78 /* 79 * The JOURNAL_DATA flag can only be changed by 80 * the relevant capability. 81 */ 82 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 83 if (!capable(CAP_SYS_RESOURCE)) 84 goto flags_out; 85 } 86 if (oldflags & EXT4_EXTENTS_FL) { 87 /* We don't support clearning extent flags */ 88 if (!(flags & EXT4_EXTENTS_FL)) { 89 err = -EOPNOTSUPP; 90 goto flags_out; 91 } 92 } else if (flags & EXT4_EXTENTS_FL) { 93 /* migrate the file */ 94 migrate = 1; 95 flags &= ~EXT4_EXTENTS_FL; 96 } 97 98 if (flags & EXT4_EOFBLOCKS_FL) { 99 /* we don't support adding EOFBLOCKS flag */ 100 if (!(oldflags & EXT4_EOFBLOCKS_FL)) { 101 err = -EOPNOTSUPP; 102 goto flags_out; 103 } 104 } else if (oldflags & EXT4_EOFBLOCKS_FL) 105 ext4_truncate(inode); 106 107 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 108 if (IS_ERR(handle)) { 109 err = PTR_ERR(handle); 110 goto flags_out; 111 } 112 if (IS_SYNC(inode)) 113 ext4_handle_sync(handle); 114 err = ext4_reserve_inode_write(handle, inode, &iloc); 115 if (err) 116 goto flags_err; 117 118 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { 119 if (!(mask & EXT4_FL_USER_MODIFIABLE)) 120 continue; 121 if (mask & flags) 122 ext4_set_inode_flag(inode, i); 123 else 124 ext4_clear_inode_flag(inode, i); 125 } 126 127 ext4_set_inode_flags(inode); 128 inode->i_ctime = ext4_current_time(inode); 129 130 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 131 flags_err: 132 ext4_journal_stop(handle); 133 if (err) 134 goto flags_out; 135 136 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) 137 err = ext4_change_inode_journal_flag(inode, jflag); 138 if (err) 139 goto flags_out; 140 if (migrate) 141 err = ext4_ext_migrate(inode); 142 flags_out: 143 mutex_unlock(&inode->i_mutex); 144 mnt_drop_write_file(filp); 145 return err; 146 } 147 case EXT4_IOC_GETVERSION: 148 case EXT4_IOC_GETVERSION_OLD: 149 return put_user(inode->i_generation, (int __user *) arg); 150 case EXT4_IOC_SETVERSION: 151 case EXT4_IOC_SETVERSION_OLD: { 152 handle_t *handle; 153 struct ext4_iloc iloc; 154 __u32 generation; 155 int err; 156 157 if (!inode_owner_or_capable(inode)) 158 return -EPERM; 159 160 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 161 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { 162 ext4_warning(sb, "Setting inode version is not " 163 "supported with metadata_csum enabled."); 164 return -ENOTTY; 165 } 166 167 err = mnt_want_write_file(filp); 168 if (err) 169 return err; 170 if (get_user(generation, (int __user *) arg)) { 171 err = -EFAULT; 172 goto setversion_out; 173 } 174 175 mutex_lock(&inode->i_mutex); 176 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 177 if (IS_ERR(handle)) { 178 err = PTR_ERR(handle); 179 goto unlock_out; 180 } 181 err = ext4_reserve_inode_write(handle, inode, &iloc); 182 if (err == 0) { 183 inode->i_ctime = ext4_current_time(inode); 184 inode->i_generation = generation; 185 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 186 } 187 ext4_journal_stop(handle); 188 189 unlock_out: 190 mutex_unlock(&inode->i_mutex); 191 setversion_out: 192 mnt_drop_write_file(filp); 193 return err; 194 } 195 case EXT4_IOC_GROUP_EXTEND: { 196 ext4_fsblk_t n_blocks_count; 197 int err, err2=0; 198 199 err = ext4_resize_begin(sb); 200 if (err) 201 return err; 202 203 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 204 err = -EFAULT; 205 goto group_extend_out; 206 } 207 208 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 209 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 210 ext4_msg(sb, KERN_ERR, 211 "Online resizing not supported with bigalloc"); 212 err = -EOPNOTSUPP; 213 goto group_extend_out; 214 } 215 216 err = mnt_want_write_file(filp); 217 if (err) 218 goto group_extend_out; 219 220 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 221 if (EXT4_SB(sb)->s_journal) { 222 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 223 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 224 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 225 } 226 if (err == 0) 227 err = err2; 228 mnt_drop_write_file(filp); 229 group_extend_out: 230 ext4_resize_end(sb); 231 return err; 232 } 233 234 case EXT4_IOC_MOVE_EXT: { 235 struct move_extent me; 236 struct fd donor; 237 int err; 238 239 if (!(filp->f_mode & FMODE_READ) || 240 !(filp->f_mode & FMODE_WRITE)) 241 return -EBADF; 242 243 if (copy_from_user(&me, 244 (struct move_extent __user *)arg, sizeof(me))) 245 return -EFAULT; 246 me.moved_len = 0; 247 248 donor = fdget(me.donor_fd); 249 if (!donor.file) 250 return -EBADF; 251 252 if (!(donor.file->f_mode & FMODE_WRITE)) { 253 err = -EBADF; 254 goto mext_out; 255 } 256 257 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 258 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 259 ext4_msg(sb, KERN_ERR, 260 "Online defrag not supported with bigalloc"); 261 err = -EOPNOTSUPP; 262 goto mext_out; 263 } 264 265 err = mnt_want_write_file(filp); 266 if (err) 267 goto mext_out; 268 269 err = ext4_move_extents(filp, donor.file, me.orig_start, 270 me.donor_start, me.len, &me.moved_len); 271 mnt_drop_write_file(filp); 272 273 if (copy_to_user((struct move_extent __user *)arg, 274 &me, sizeof(me))) 275 err = -EFAULT; 276 mext_out: 277 fdput(donor); 278 return err; 279 } 280 281 case EXT4_IOC_GROUP_ADD: { 282 struct ext4_new_group_data input; 283 int err, err2=0; 284 285 err = ext4_resize_begin(sb); 286 if (err) 287 return err; 288 289 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 290 sizeof(input))) { 291 err = -EFAULT; 292 goto group_add_out; 293 } 294 295 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 296 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 297 ext4_msg(sb, KERN_ERR, 298 "Online resizing not supported with bigalloc"); 299 err = -EOPNOTSUPP; 300 goto group_add_out; 301 } 302 303 err = mnt_want_write_file(filp); 304 if (err) 305 goto group_add_out; 306 307 err = ext4_group_add(sb, &input); 308 if (EXT4_SB(sb)->s_journal) { 309 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 310 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 311 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 312 } 313 if (err == 0) 314 err = err2; 315 mnt_drop_write_file(filp); 316 if (!err && ext4_has_group_desc_csum(sb) && 317 test_opt(sb, INIT_INODE_TABLE)) 318 err = ext4_register_li_request(sb, input.group); 319 group_add_out: 320 ext4_resize_end(sb); 321 return err; 322 } 323 324 case EXT4_IOC_MIGRATE: 325 { 326 int err; 327 if (!inode_owner_or_capable(inode)) 328 return -EACCES; 329 330 err = mnt_want_write_file(filp); 331 if (err) 332 return err; 333 /* 334 * inode_mutex prevent write and truncate on the file. 335 * Read still goes through. We take i_data_sem in 336 * ext4_ext_swap_inode_data before we switch the 337 * inode format to prevent read. 338 */ 339 mutex_lock(&(inode->i_mutex)); 340 err = ext4_ext_migrate(inode); 341 mutex_unlock(&(inode->i_mutex)); 342 mnt_drop_write_file(filp); 343 return err; 344 } 345 346 case EXT4_IOC_ALLOC_DA_BLKS: 347 { 348 int err; 349 if (!inode_owner_or_capable(inode)) 350 return -EACCES; 351 352 err = mnt_want_write_file(filp); 353 if (err) 354 return err; 355 err = ext4_alloc_da_blocks(inode); 356 mnt_drop_write_file(filp); 357 return err; 358 } 359 360 case EXT4_IOC_RESIZE_FS: { 361 ext4_fsblk_t n_blocks_count; 362 struct super_block *sb = inode->i_sb; 363 int err = 0, err2 = 0; 364 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 365 366 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 367 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 368 ext4_msg(sb, KERN_ERR, 369 "Online resizing not (yet) supported with bigalloc"); 370 return -EOPNOTSUPP; 371 } 372 373 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 374 sizeof(__u64))) { 375 return -EFAULT; 376 } 377 378 err = ext4_resize_begin(sb); 379 if (err) 380 return err; 381 382 err = mnt_want_write_file(filp); 383 if (err) 384 goto resizefs_out; 385 386 err = ext4_resize_fs(sb, n_blocks_count); 387 if (EXT4_SB(sb)->s_journal) { 388 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 389 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 390 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 391 } 392 if (err == 0) 393 err = err2; 394 mnt_drop_write_file(filp); 395 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) && 396 ext4_has_group_desc_csum(sb) && 397 test_opt(sb, INIT_INODE_TABLE)) 398 err = ext4_register_li_request(sb, o_group); 399 400 resizefs_out: 401 ext4_resize_end(sb); 402 return err; 403 } 404 405 case FITRIM: 406 { 407 struct request_queue *q = bdev_get_queue(sb->s_bdev); 408 struct fstrim_range range; 409 int ret = 0; 410 411 if (!capable(CAP_SYS_ADMIN)) 412 return -EPERM; 413 414 if (!blk_queue_discard(q)) 415 return -EOPNOTSUPP; 416 417 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 418 sizeof(range))) 419 return -EFAULT; 420 421 range.minlen = max((unsigned int)range.minlen, 422 q->limits.discard_granularity); 423 ret = ext4_trim_fs(sb, &range); 424 if (ret < 0) 425 return ret; 426 427 if (copy_to_user((struct fstrim_range __user *)arg, &range, 428 sizeof(range))) 429 return -EFAULT; 430 431 return 0; 432 } 433 434 default: 435 return -ENOTTY; 436 } 437 } 438 439 #ifdef CONFIG_COMPAT 440 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 441 { 442 /* These are just misnamed, they actually get/put from/to user an int */ 443 switch (cmd) { 444 case EXT4_IOC32_GETFLAGS: 445 cmd = EXT4_IOC_GETFLAGS; 446 break; 447 case EXT4_IOC32_SETFLAGS: 448 cmd = EXT4_IOC_SETFLAGS; 449 break; 450 case EXT4_IOC32_GETVERSION: 451 cmd = EXT4_IOC_GETVERSION; 452 break; 453 case EXT4_IOC32_SETVERSION: 454 cmd = EXT4_IOC_SETVERSION; 455 break; 456 case EXT4_IOC32_GROUP_EXTEND: 457 cmd = EXT4_IOC_GROUP_EXTEND; 458 break; 459 case EXT4_IOC32_GETVERSION_OLD: 460 cmd = EXT4_IOC_GETVERSION_OLD; 461 break; 462 case EXT4_IOC32_SETVERSION_OLD: 463 cmd = EXT4_IOC_SETVERSION_OLD; 464 break; 465 case EXT4_IOC32_GETRSVSZ: 466 cmd = EXT4_IOC_GETRSVSZ; 467 break; 468 case EXT4_IOC32_SETRSVSZ: 469 cmd = EXT4_IOC_SETRSVSZ; 470 break; 471 case EXT4_IOC32_GROUP_ADD: { 472 struct compat_ext4_new_group_input __user *uinput; 473 struct ext4_new_group_input input; 474 mm_segment_t old_fs; 475 int err; 476 477 uinput = compat_ptr(arg); 478 err = get_user(input.group, &uinput->group); 479 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 480 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 481 err |= get_user(input.inode_table, &uinput->inode_table); 482 err |= get_user(input.blocks_count, &uinput->blocks_count); 483 err |= get_user(input.reserved_blocks, 484 &uinput->reserved_blocks); 485 if (err) 486 return -EFAULT; 487 old_fs = get_fs(); 488 set_fs(KERNEL_DS); 489 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, 490 (unsigned long) &input); 491 set_fs(old_fs); 492 return err; 493 } 494 case EXT4_IOC_MOVE_EXT: 495 case FITRIM: 496 case EXT4_IOC_RESIZE_FS: 497 break; 498 default: 499 return -ENOIOCTLCMD; 500 } 501 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 502 } 503 #endif 504