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 21long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 22{ 23 struct inode *inode = filp->f_dentry->d_inode; 24 struct ext4_inode_info *ei = EXT4_I(inode); 25 unsigned int flags; 26 27 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 28 29 switch (cmd) { 30 case EXT4_IOC_GETFLAGS: 31 ext4_get_inode_flags(ei); 32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 33 return put_user(flags, (int __user *) arg); 34 case EXT4_IOC_SETFLAGS: { 35 handle_t *handle = NULL; 36 int err, migrate = 0; 37 struct ext4_iloc iloc; 38 unsigned int oldflags; 39 unsigned int jflag; 40 41 if (!is_owner_or_cap(inode)) 42 return -EACCES; 43 44 if (get_user(flags, (int __user *) arg)) 45 return -EFAULT; 46 47 err = mnt_want_write(filp->f_path.mnt); 48 if (err) 49 return err; 50 51 flags = ext4_mask_flags(inode->i_mode, flags); 52 53 err = -EPERM; 54 mutex_lock(&inode->i_mutex); 55 /* Is it quota file? Do not allow user to mess with it */ 56 if (IS_NOQUOTA(inode)) 57 goto flags_out; 58 59 oldflags = ei->i_flags; 60 61 /* The JOURNAL_DATA flag is modifiable only by root */ 62 jflag = flags & EXT4_JOURNAL_DATA_FL; 63 64 /* 65 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 66 * the relevant capability. 67 * 68 * This test looks nicer. Thanks to Pauline Middelink 69 */ 70 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { 71 if (!capable(CAP_LINUX_IMMUTABLE)) 72 goto flags_out; 73 } 74 75 /* 76 * The JOURNAL_DATA flag can only be changed by 77 * the relevant capability. 78 */ 79 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 80 if (!capable(CAP_SYS_RESOURCE)) 81 goto flags_out; 82 } 83 if (oldflags & EXT4_EXTENTS_FL) { 84 /* We don't support clearning extent flags */ 85 if (!(flags & EXT4_EXTENTS_FL)) { 86 err = -EOPNOTSUPP; 87 goto flags_out; 88 } 89 } else if (flags & EXT4_EXTENTS_FL) { 90 /* migrate the file */ 91 migrate = 1; 92 flags &= ~EXT4_EXTENTS_FL; 93 } 94 95 if (flags & EXT4_EOFBLOCKS_FL) { 96 /* we don't support adding EOFBLOCKS flag */ 97 if (!(oldflags & EXT4_EOFBLOCKS_FL)) { 98 err = -EOPNOTSUPP; 99 goto flags_out; 100 } 101 } else if (oldflags & EXT4_EOFBLOCKS_FL) 102 ext4_truncate(inode); 103 104 handle = ext4_journal_start(inode, 1); 105 if (IS_ERR(handle)) { 106 err = PTR_ERR(handle); 107 goto flags_out; 108 } 109 if (IS_SYNC(inode)) 110 ext4_handle_sync(handle); 111 err = ext4_reserve_inode_write(handle, inode, &iloc); 112 if (err) 113 goto flags_err; 114 115 flags = flags & EXT4_FL_USER_MODIFIABLE; 116 flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; 117 ei->i_flags = flags; 118 119 ext4_set_inode_flags(inode); 120 inode->i_ctime = ext4_current_time(inode); 121 122 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 123flags_err: 124 ext4_journal_stop(handle); 125 if (err) 126 goto flags_out; 127 128 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) 129 err = ext4_change_inode_journal_flag(inode, jflag); 130 if (err) 131 goto flags_out; 132 if (migrate) 133 err = ext4_ext_migrate(inode); 134flags_out: 135 mutex_unlock(&inode->i_mutex); 136 mnt_drop_write(filp->f_path.mnt); 137 return err; 138 } 139 case EXT4_IOC_GETVERSION: 140 case EXT4_IOC_GETVERSION_OLD: 141 return put_user(inode->i_generation, (int __user *) arg); 142 case EXT4_IOC_SETVERSION: 143 case EXT4_IOC_SETVERSION_OLD: { 144 handle_t *handle; 145 struct ext4_iloc iloc; 146 __u32 generation; 147 int err; 148 149 if (!is_owner_or_cap(inode)) 150 return -EPERM; 151 152 err = mnt_want_write(filp->f_path.mnt); 153 if (err) 154 return err; 155 if (get_user(generation, (int __user *) arg)) { 156 err = -EFAULT; 157 goto setversion_out; 158 } 159 160 handle = ext4_journal_start(inode, 1); 161 if (IS_ERR(handle)) { 162 err = PTR_ERR(handle); 163 goto setversion_out; 164 } 165 err = ext4_reserve_inode_write(handle, inode, &iloc); 166 if (err == 0) { 167 inode->i_ctime = ext4_current_time(inode); 168 inode->i_generation = generation; 169 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 170 } 171 ext4_journal_stop(handle); 172setversion_out: 173 mnt_drop_write(filp->f_path.mnt); 174 return err; 175 } 176#ifdef CONFIG_JBD2_DEBUG 177 case EXT4_IOC_WAIT_FOR_READONLY: 178 /* 179 * This is racy - by the time we're woken up and running, 180 * the superblock could be released. And the module could 181 * have been unloaded. So sue me. 182 * 183 * Returns 1 if it slept, else zero. 184 */ 185 { 186 struct super_block *sb = inode->i_sb; 187 DECLARE_WAITQUEUE(wait, current); 188 int ret = 0; 189 190 set_current_state(TASK_INTERRUPTIBLE); 191 add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); 192 if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { 193 schedule(); 194 ret = 1; 195 } 196 remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); 197 return ret; 198 } 199#endif 200 case EXT4_IOC_GROUP_EXTEND: { 201 ext4_fsblk_t n_blocks_count; 202 struct super_block *sb = inode->i_sb; 203 int err, err2=0; 204 205 if (!capable(CAP_SYS_RESOURCE)) 206 return -EPERM; 207 208 if (get_user(n_blocks_count, (__u32 __user *)arg)) 209 return -EFAULT; 210 211 err = mnt_want_write(filp->f_path.mnt); 212 if (err) 213 return err; 214 215 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 216 if (EXT4_SB(sb)->s_journal) { 217 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 218 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 219 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 220 } 221 if (err == 0) 222 err = err2; 223 mnt_drop_write(filp->f_path.mnt); 224 225 return err; 226 } 227 228 case EXT4_IOC_MOVE_EXT: { 229 struct move_extent me; 230 struct file *donor_filp; 231 int err; 232 233 if (!(filp->f_mode & FMODE_READ) || 234 !(filp->f_mode & FMODE_WRITE)) 235 return -EBADF; 236 237 if (copy_from_user(&me, 238 (struct move_extent __user *)arg, sizeof(me))) 239 return -EFAULT; 240 me.moved_len = 0; 241 242 donor_filp = fget(me.donor_fd); 243 if (!donor_filp) 244 return -EBADF; 245 246 if (!(donor_filp->f_mode & FMODE_WRITE)) { 247 err = -EBADF; 248 goto mext_out; 249 } 250 251 err = mnt_want_write(filp->f_path.mnt); 252 if (err) 253 goto mext_out; 254 255 err = ext4_move_extents(filp, donor_filp, me.orig_start, 256 me.donor_start, me.len, &me.moved_len); 257 mnt_drop_write(filp->f_path.mnt); 258 if (me.moved_len > 0) 259 file_remove_suid(donor_filp); 260 261 if (copy_to_user((struct move_extent __user *)arg, 262 &me, sizeof(me))) 263 err = -EFAULT; 264mext_out: 265 fput(donor_filp); 266 return err; 267 } 268 269 case EXT4_IOC_GROUP_ADD: { 270 struct ext4_new_group_data input; 271 struct super_block *sb = inode->i_sb; 272 int err, err2=0; 273 274 if (!capable(CAP_SYS_RESOURCE)) 275 return -EPERM; 276 277 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 278 sizeof(input))) 279 return -EFAULT; 280 281 err = mnt_want_write(filp->f_path.mnt); 282 if (err) 283 return err; 284 285 err = ext4_group_add(sb, &input); 286 if (EXT4_SB(sb)->s_journal) { 287 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 288 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 289 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 290 } 291 if (err == 0) 292 err = err2; 293 mnt_drop_write(filp->f_path.mnt); 294 295 return err; 296 } 297 298 case EXT4_IOC_MIGRATE: 299 { 300 int err; 301 if (!is_owner_or_cap(inode)) 302 return -EACCES; 303 304 err = mnt_want_write(filp->f_path.mnt); 305 if (err) 306 return err; 307 /* 308 * inode_mutex prevent write and truncate on the file. 309 * Read still goes through. We take i_data_sem in 310 * ext4_ext_swap_inode_data before we switch the 311 * inode format to prevent read. 312 */ 313 mutex_lock(&(inode->i_mutex)); 314 err = ext4_ext_migrate(inode); 315 mutex_unlock(&(inode->i_mutex)); 316 mnt_drop_write(filp->f_path.mnt); 317 return err; 318 } 319 320 case EXT4_IOC_ALLOC_DA_BLKS: 321 { 322 int err; 323 if (!is_owner_or_cap(inode)) 324 return -EACCES; 325 326 err = mnt_want_write(filp->f_path.mnt); 327 if (err) 328 return err; 329 err = ext4_alloc_da_blocks(inode); 330 mnt_drop_write(filp->f_path.mnt); 331 return err; 332 } 333 334 default: 335 return -ENOTTY; 336 } 337} 338 339#ifdef CONFIG_COMPAT 340long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 341{ 342 /* These are just misnamed, they actually get/put from/to user an int */ 343 switch (cmd) { 344 case EXT4_IOC32_GETFLAGS: 345 cmd = EXT4_IOC_GETFLAGS; 346 break; 347 case EXT4_IOC32_SETFLAGS: 348 cmd = EXT4_IOC_SETFLAGS; 349 break; 350 case EXT4_IOC32_GETVERSION: 351 cmd = EXT4_IOC_GETVERSION; 352 break; 353 case EXT4_IOC32_SETVERSION: 354 cmd = EXT4_IOC_SETVERSION; 355 break; 356 case EXT4_IOC32_GROUP_EXTEND: 357 cmd = EXT4_IOC_GROUP_EXTEND; 358 break; 359 case EXT4_IOC32_GETVERSION_OLD: 360 cmd = EXT4_IOC_GETVERSION_OLD; 361 break; 362 case EXT4_IOC32_SETVERSION_OLD: 363 cmd = EXT4_IOC_SETVERSION_OLD; 364 break; 365#ifdef CONFIG_JBD2_DEBUG 366 case EXT4_IOC32_WAIT_FOR_READONLY: 367 cmd = EXT4_IOC_WAIT_FOR_READONLY; 368 break; 369#endif 370 case EXT4_IOC32_GETRSVSZ: 371 cmd = EXT4_IOC_GETRSVSZ; 372 break; 373 case EXT4_IOC32_SETRSVSZ: 374 cmd = EXT4_IOC_SETRSVSZ; 375 break; 376 case EXT4_IOC32_GROUP_ADD: { 377 struct compat_ext4_new_group_input __user *uinput; 378 struct ext4_new_group_input input; 379 mm_segment_t old_fs; 380 int err; 381 382 uinput = compat_ptr(arg); 383 err = get_user(input.group, &uinput->group); 384 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 385 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 386 err |= get_user(input.inode_table, &uinput->inode_table); 387 err |= get_user(input.blocks_count, &uinput->blocks_count); 388 err |= get_user(input.reserved_blocks, 389 &uinput->reserved_blocks); 390 if (err) 391 return -EFAULT; 392 old_fs = get_fs(); 393 set_fs(KERNEL_DS); 394 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, 395 (unsigned long) &input); 396 set_fs(old_fs); 397 return err; 398 } 399 case EXT4_IOC_MOVE_EXT: 400 break; 401 default: 402 return -ENOIOCTLCMD; 403 } 404 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 405} 406#endif 407