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 = filp->f_dentry->d_inode; 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, 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, 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 file *donor_filp; 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_filp = fget(me.donor_fd); 249 if (!donor_filp) 250 return -EBADF; 251 252 if (!(donor_filp->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 return -EOPNOTSUPP; 262 } 263 264 err = mnt_want_write_file(filp); 265 if (err) 266 goto mext_out; 267 268 err = ext4_move_extents(filp, donor_filp, me.orig_start, 269 me.donor_start, me.len, &me.moved_len); 270 mnt_drop_write_file(filp); 271 272 if (copy_to_user((struct move_extent __user *)arg, 273 &me, sizeof(me))) 274 err = -EFAULT; 275 mext_out: 276 fput(donor_filp); 277 return err; 278 } 279 280 case EXT4_IOC_GROUP_ADD: { 281 struct ext4_new_group_data input; 282 int err, err2=0; 283 284 err = ext4_resize_begin(sb); 285 if (err) 286 return err; 287 288 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 289 sizeof(input))) { 290 err = -EFAULT; 291 goto group_add_out; 292 } 293 294 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 295 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 296 ext4_msg(sb, KERN_ERR, 297 "Online resizing not supported with bigalloc"); 298 err = -EOPNOTSUPP; 299 goto group_add_out; 300 } 301 302 err = mnt_want_write_file(filp); 303 if (err) 304 goto group_add_out; 305 306 err = ext4_group_add(sb, &input); 307 if (EXT4_SB(sb)->s_journal) { 308 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 309 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 310 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 311 } 312 if (err == 0) 313 err = err2; 314 mnt_drop_write_file(filp); 315 group_add_out: 316 ext4_resize_end(sb); 317 return err; 318 } 319 320 case EXT4_IOC_MIGRATE: 321 { 322 int err; 323 if (!inode_owner_or_capable(inode)) 324 return -EACCES; 325 326 err = mnt_want_write_file(filp); 327 if (err) 328 return err; 329 /* 330 * inode_mutex prevent write and truncate on the file. 331 * Read still goes through. We take i_data_sem in 332 * ext4_ext_swap_inode_data before we switch the 333 * inode format to prevent read. 334 */ 335 mutex_lock(&(inode->i_mutex)); 336 err = ext4_ext_migrate(inode); 337 mutex_unlock(&(inode->i_mutex)); 338 mnt_drop_write_file(filp); 339 return err; 340 } 341 342 case EXT4_IOC_ALLOC_DA_BLKS: 343 { 344 int err; 345 if (!inode_owner_or_capable(inode)) 346 return -EACCES; 347 348 err = mnt_want_write_file(filp); 349 if (err) 350 return err; 351 err = ext4_alloc_da_blocks(inode); 352 mnt_drop_write_file(filp); 353 return err; 354 } 355 356 case EXT4_IOC_RESIZE_FS: { 357 ext4_fsblk_t n_blocks_count; 358 struct super_block *sb = inode->i_sb; 359 int err = 0, err2 = 0; 360 361 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 362 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 363 ext4_msg(sb, KERN_ERR, 364 "Online resizing not (yet) supported with bigalloc"); 365 return -EOPNOTSUPP; 366 } 367 368 if (EXT4_HAS_INCOMPAT_FEATURE(sb, 369 EXT4_FEATURE_INCOMPAT_META_BG)) { 370 ext4_msg(sb, KERN_ERR, 371 "Online resizing not (yet) supported with meta_bg"); 372 return -EOPNOTSUPP; 373 } 374 375 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 376 sizeof(__u64))) { 377 return -EFAULT; 378 } 379 380 if (n_blocks_count > MAX_32_NUM && 381 !EXT4_HAS_INCOMPAT_FEATURE(sb, 382 EXT4_FEATURE_INCOMPAT_64BIT)) { 383 ext4_msg(sb, KERN_ERR, 384 "File system only supports 32-bit block numbers"); 385 return -EOPNOTSUPP; 386 } 387 388 err = ext4_resize_begin(sb); 389 if (err) 390 return err; 391 392 err = mnt_want_write(filp->f_path.mnt); 393 if (err) 394 goto resizefs_out; 395 396 err = ext4_resize_fs(sb, n_blocks_count); 397 if (EXT4_SB(sb)->s_journal) { 398 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 399 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 400 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 401 } 402 if (err == 0) 403 err = err2; 404 mnt_drop_write(filp->f_path.mnt); 405 resizefs_out: 406 ext4_resize_end(sb); 407 return err; 408 } 409 410 case FITRIM: 411 { 412 struct request_queue *q = bdev_get_queue(sb->s_bdev); 413 struct fstrim_range range; 414 int ret = 0; 415 416 if (!capable(CAP_SYS_ADMIN)) 417 return -EPERM; 418 419 if (!blk_queue_discard(q)) 420 return -EOPNOTSUPP; 421 422 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 423 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 424 ext4_msg(sb, KERN_ERR, 425 "FITRIM not supported with bigalloc"); 426 return -EOPNOTSUPP; 427 } 428 429 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 430 sizeof(range))) 431 return -EFAULT; 432 433 range.minlen = max((unsigned int)range.minlen, 434 q->limits.discard_granularity); 435 ret = ext4_trim_fs(sb, &range); 436 if (ret < 0) 437 return ret; 438 439 if (copy_to_user((struct fstrim_range __user *)arg, &range, 440 sizeof(range))) 441 return -EFAULT; 442 443 return 0; 444 } 445 446 default: 447 return -ENOTTY; 448 } 449 } 450 451 #ifdef CONFIG_COMPAT 452 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 453 { 454 /* These are just misnamed, they actually get/put from/to user an int */ 455 switch (cmd) { 456 case EXT4_IOC32_GETFLAGS: 457 cmd = EXT4_IOC_GETFLAGS; 458 break; 459 case EXT4_IOC32_SETFLAGS: 460 cmd = EXT4_IOC_SETFLAGS; 461 break; 462 case EXT4_IOC32_GETVERSION: 463 cmd = EXT4_IOC_GETVERSION; 464 break; 465 case EXT4_IOC32_SETVERSION: 466 cmd = EXT4_IOC_SETVERSION; 467 break; 468 case EXT4_IOC32_GROUP_EXTEND: 469 cmd = EXT4_IOC_GROUP_EXTEND; 470 break; 471 case EXT4_IOC32_GETVERSION_OLD: 472 cmd = EXT4_IOC_GETVERSION_OLD; 473 break; 474 case EXT4_IOC32_SETVERSION_OLD: 475 cmd = EXT4_IOC_SETVERSION_OLD; 476 break; 477 case EXT4_IOC32_GETRSVSZ: 478 cmd = EXT4_IOC_GETRSVSZ; 479 break; 480 case EXT4_IOC32_SETRSVSZ: 481 cmd = EXT4_IOC_SETRSVSZ; 482 break; 483 case EXT4_IOC32_GROUP_ADD: { 484 struct compat_ext4_new_group_input __user *uinput; 485 struct ext4_new_group_input input; 486 mm_segment_t old_fs; 487 int err; 488 489 uinput = compat_ptr(arg); 490 err = get_user(input.group, &uinput->group); 491 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 492 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 493 err |= get_user(input.inode_table, &uinput->inode_table); 494 err |= get_user(input.blocks_count, &uinput->blocks_count); 495 err |= get_user(input.reserved_blocks, 496 &uinput->reserved_blocks); 497 if (err) 498 return -EFAULT; 499 old_fs = get_fs(); 500 set_fs(KERNEL_DS); 501 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, 502 (unsigned long) &input); 503 set_fs(old_fs); 504 return err; 505 } 506 case EXT4_IOC_MOVE_EXT: 507 case FITRIM: 508 case EXT4_IOC_RESIZE_FS: 509 break; 510 default: 511 return -ENOIOCTLCMD; 512 } 513 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 514 } 515 #endif 516