1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/ioctl.c 3ac27a0ecSDave Kleikamp * 4ac27a0ecSDave Kleikamp * Copyright (C) 1993, 1994, 1995 5ac27a0ecSDave Kleikamp * Remy Card (card@masi.ibp.fr) 6ac27a0ecSDave Kleikamp * Laboratoire MASI - Institut Blaise Pascal 7ac27a0ecSDave Kleikamp * Universite Pierre et Marie Curie (Paris VI) 8ac27a0ecSDave Kleikamp */ 9ac27a0ecSDave Kleikamp 10ac27a0ecSDave Kleikamp #include <linux/fs.h> 11dab291afSMingming Cao #include <linux/jbd2.h> 12ac27a0ecSDave Kleikamp #include <linux/capability.h> 13ac27a0ecSDave Kleikamp #include <linux/time.h> 14ac27a0ecSDave Kleikamp #include <linux/compat.h> 15ac27a0ecSDave Kleikamp #include <linux/smp_lock.h> 1642a74f20SDave Hansen #include <linux/mount.h> 17ac27a0ecSDave Kleikamp #include <asm/uaccess.h> 183dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 193dcf5451SChristoph Hellwig #include "ext4.h" 20ac27a0ecSDave Kleikamp 215cdd7b2dSAndi Kleen long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 22ac27a0ecSDave Kleikamp { 235cdd7b2dSAndi Kleen struct inode *inode = filp->f_dentry->d_inode; 24617ba13bSMingming Cao struct ext4_inode_info *ei = EXT4_I(inode); 25ac27a0ecSDave Kleikamp unsigned int flags; 26ac27a0ecSDave Kleikamp 27617ba13bSMingming Cao ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 28ac27a0ecSDave Kleikamp 29ac27a0ecSDave Kleikamp switch (cmd) { 30617ba13bSMingming Cao case EXT4_IOC_GETFLAGS: 31ff9ddf7eSJan Kara ext4_get_inode_flags(ei); 32617ba13bSMingming Cao flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 33ac27a0ecSDave Kleikamp return put_user(flags, (int __user *) arg); 34617ba13bSMingming Cao case EXT4_IOC_SETFLAGS: { 35ac27a0ecSDave Kleikamp handle_t *handle = NULL; 364db46fc2SAneesh Kumar K.V int err, migrate = 0; 37617ba13bSMingming Cao struct ext4_iloc iloc; 38ac27a0ecSDave Kleikamp unsigned int oldflags; 39ac27a0ecSDave Kleikamp unsigned int jflag; 40ac27a0ecSDave Kleikamp 413bd858abSSatyam Sharma if (!is_owner_or_cap(inode)) 42ac27a0ecSDave Kleikamp return -EACCES; 43ac27a0ecSDave Kleikamp 44ac27a0ecSDave Kleikamp if (get_user(flags, (int __user *) arg)) 45ac27a0ecSDave Kleikamp return -EFAULT; 46ac27a0ecSDave Kleikamp 4742a74f20SDave Hansen err = mnt_want_write(filp->f_path.mnt); 4842a74f20SDave Hansen if (err) 4942a74f20SDave Hansen return err; 5042a74f20SDave Hansen 512dc6b0d4SDuane Griffin flags = ext4_mask_flags(inode->i_mode, flags); 52ac27a0ecSDave Kleikamp 5342a74f20SDave Hansen err = -EPERM; 54ac27a0ecSDave Kleikamp mutex_lock(&inode->i_mutex); 55e47776a0SJan Kara /* Is it quota file? Do not allow user to mess with it */ 5642a74f20SDave Hansen if (IS_NOQUOTA(inode)) 5742a74f20SDave Hansen goto flags_out; 5842a74f20SDave Hansen 59ac27a0ecSDave Kleikamp oldflags = ei->i_flags; 60ac27a0ecSDave Kleikamp 61ac27a0ecSDave Kleikamp /* The JOURNAL_DATA flag is modifiable only by root */ 62617ba13bSMingming Cao jflag = flags & EXT4_JOURNAL_DATA_FL; 63ac27a0ecSDave Kleikamp 64ac27a0ecSDave Kleikamp /* 65ac27a0ecSDave Kleikamp * The IMMUTABLE and APPEND_ONLY flags can only be changed by 66ac27a0ecSDave Kleikamp * the relevant capability. 67ac27a0ecSDave Kleikamp * 68ac27a0ecSDave Kleikamp * This test looks nicer. Thanks to Pauline Middelink 69ac27a0ecSDave Kleikamp */ 70617ba13bSMingming Cao if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { 7142a74f20SDave Hansen if (!capable(CAP_LINUX_IMMUTABLE)) 7242a74f20SDave Hansen goto flags_out; 73ac27a0ecSDave Kleikamp } 74ac27a0ecSDave Kleikamp 75ac27a0ecSDave Kleikamp /* 76ac27a0ecSDave Kleikamp * The JOURNAL_DATA flag can only be changed by 77ac27a0ecSDave Kleikamp * the relevant capability. 78ac27a0ecSDave Kleikamp */ 79617ba13bSMingming Cao if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 8042a74f20SDave Hansen if (!capable(CAP_SYS_RESOURCE)) 8142a74f20SDave Hansen goto flags_out; 82ac27a0ecSDave Kleikamp } 834db46fc2SAneesh Kumar K.V if (oldflags & EXT4_EXTENTS_FL) { 844db46fc2SAneesh Kumar K.V /* We don't support clearning extent flags */ 854db46fc2SAneesh Kumar K.V if (!(flags & EXT4_EXTENTS_FL)) { 864db46fc2SAneesh Kumar K.V err = -EOPNOTSUPP; 874db46fc2SAneesh Kumar K.V goto flags_out; 884db46fc2SAneesh Kumar K.V } 894db46fc2SAneesh Kumar K.V } else if (flags & EXT4_EXTENTS_FL) { 904db46fc2SAneesh Kumar K.V /* migrate the file */ 914db46fc2SAneesh Kumar K.V migrate = 1; 924db46fc2SAneesh Kumar K.V flags &= ~EXT4_EXTENTS_FL; 934db46fc2SAneesh Kumar K.V } 94ac27a0ecSDave Kleikamp 95617ba13bSMingming Cao handle = ext4_journal_start(inode, 1); 96ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 9742a74f20SDave Hansen err = PTR_ERR(handle); 9842a74f20SDave Hansen goto flags_out; 99ac27a0ecSDave Kleikamp } 100ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 1010390131bSFrank Mayhar ext4_handle_sync(handle); 102617ba13bSMingming Cao err = ext4_reserve_inode_write(handle, inode, &iloc); 103ac27a0ecSDave Kleikamp if (err) 104ac27a0ecSDave Kleikamp goto flags_err; 105ac27a0ecSDave Kleikamp 106617ba13bSMingming Cao flags = flags & EXT4_FL_USER_MODIFIABLE; 107617ba13bSMingming Cao flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; 108ac27a0ecSDave Kleikamp ei->i_flags = flags; 109ac27a0ecSDave Kleikamp 110617ba13bSMingming Cao ext4_set_inode_flags(inode); 111ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 112ac27a0ecSDave Kleikamp 113617ba13bSMingming Cao err = ext4_mark_iloc_dirty(handle, inode, &iloc); 114ac27a0ecSDave Kleikamp flags_err: 115617ba13bSMingming Cao ext4_journal_stop(handle); 11642a74f20SDave Hansen if (err) 11742a74f20SDave Hansen goto flags_out; 118ac27a0ecSDave Kleikamp 119617ba13bSMingming Cao if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) 120617ba13bSMingming Cao err = ext4_change_inode_journal_flag(inode, jflag); 1214db46fc2SAneesh Kumar K.V if (err) 1224db46fc2SAneesh Kumar K.V goto flags_out; 1234db46fc2SAneesh Kumar K.V if (migrate) 1244db46fc2SAneesh Kumar K.V err = ext4_ext_migrate(inode); 12542a74f20SDave Hansen flags_out: 126ac27a0ecSDave Kleikamp mutex_unlock(&inode->i_mutex); 12742a74f20SDave Hansen mnt_drop_write(filp->f_path.mnt); 128ac27a0ecSDave Kleikamp return err; 129ac27a0ecSDave Kleikamp } 130617ba13bSMingming Cao case EXT4_IOC_GETVERSION: 131617ba13bSMingming Cao case EXT4_IOC_GETVERSION_OLD: 132ac27a0ecSDave Kleikamp return put_user(inode->i_generation, (int __user *) arg); 133617ba13bSMingming Cao case EXT4_IOC_SETVERSION: 134617ba13bSMingming Cao case EXT4_IOC_SETVERSION_OLD: { 135ac27a0ecSDave Kleikamp handle_t *handle; 136617ba13bSMingming Cao struct ext4_iloc iloc; 137ac27a0ecSDave Kleikamp __u32 generation; 138ac27a0ecSDave Kleikamp int err; 139ac27a0ecSDave Kleikamp 1403bd858abSSatyam Sharma if (!is_owner_or_cap(inode)) 141ac27a0ecSDave Kleikamp return -EPERM; 14242a74f20SDave Hansen 14342a74f20SDave Hansen err = mnt_want_write(filp->f_path.mnt); 14442a74f20SDave Hansen if (err) 14542a74f20SDave Hansen return err; 14642a74f20SDave Hansen if (get_user(generation, (int __user *) arg)) { 14742a74f20SDave Hansen err = -EFAULT; 14842a74f20SDave Hansen goto setversion_out; 14942a74f20SDave Hansen } 150ac27a0ecSDave Kleikamp 151617ba13bSMingming Cao handle = ext4_journal_start(inode, 1); 15242a74f20SDave Hansen if (IS_ERR(handle)) { 15342a74f20SDave Hansen err = PTR_ERR(handle); 15442a74f20SDave Hansen goto setversion_out; 15542a74f20SDave Hansen } 156617ba13bSMingming Cao err = ext4_reserve_inode_write(handle, inode, &iloc); 157ac27a0ecSDave Kleikamp if (err == 0) { 158ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 159ac27a0ecSDave Kleikamp inode->i_generation = generation; 160617ba13bSMingming Cao err = ext4_mark_iloc_dirty(handle, inode, &iloc); 161ac27a0ecSDave Kleikamp } 162617ba13bSMingming Cao ext4_journal_stop(handle); 16342a74f20SDave Hansen setversion_out: 16442a74f20SDave Hansen mnt_drop_write(filp->f_path.mnt); 165ac27a0ecSDave Kleikamp return err; 166ac27a0ecSDave Kleikamp } 167e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 168617ba13bSMingming Cao case EXT4_IOC_WAIT_FOR_READONLY: 169ac27a0ecSDave Kleikamp /* 170ac27a0ecSDave Kleikamp * This is racy - by the time we're woken up and running, 171ac27a0ecSDave Kleikamp * the superblock could be released. And the module could 172ac27a0ecSDave Kleikamp * have been unloaded. So sue me. 173ac27a0ecSDave Kleikamp * 174ac27a0ecSDave Kleikamp * Returns 1 if it slept, else zero. 175ac27a0ecSDave Kleikamp */ 176ac27a0ecSDave Kleikamp { 177ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 178ac27a0ecSDave Kleikamp DECLARE_WAITQUEUE(wait, current); 179ac27a0ecSDave Kleikamp int ret = 0; 180ac27a0ecSDave Kleikamp 181ac27a0ecSDave Kleikamp set_current_state(TASK_INTERRUPTIBLE); 182617ba13bSMingming Cao add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); 183617ba13bSMingming Cao if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { 184ac27a0ecSDave Kleikamp schedule(); 185ac27a0ecSDave Kleikamp ret = 1; 186ac27a0ecSDave Kleikamp } 187617ba13bSMingming Cao remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); 188ac27a0ecSDave Kleikamp return ret; 189ac27a0ecSDave Kleikamp } 190ac27a0ecSDave Kleikamp #endif 191617ba13bSMingming Cao case EXT4_IOC_GROUP_EXTEND: { 192617ba13bSMingming Cao ext4_fsblk_t n_blocks_count; 193ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1947ffe1ea8SHidehiro Kawai int err, err2; 195ac27a0ecSDave Kleikamp 196ac27a0ecSDave Kleikamp if (!capable(CAP_SYS_RESOURCE)) 197ac27a0ecSDave Kleikamp return -EPERM; 198ac27a0ecSDave Kleikamp 199ac27a0ecSDave Kleikamp if (get_user(n_blocks_count, (__u32 __user *)arg)) 200ac27a0ecSDave Kleikamp return -EFAULT; 201ac27a0ecSDave Kleikamp 20242a74f20SDave Hansen err = mnt_want_write(filp->f_path.mnt); 20342a74f20SDave Hansen if (err) 20442a74f20SDave Hansen return err; 20542a74f20SDave Hansen 206617ba13bSMingming Cao err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 207dab291afSMingming Cao jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 2087ffe1ea8SHidehiro Kawai err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 209dab291afSMingming Cao jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2107ffe1ea8SHidehiro Kawai if (err == 0) 2117ffe1ea8SHidehiro Kawai err = err2; 21242a74f20SDave Hansen mnt_drop_write(filp->f_path.mnt); 213ac27a0ecSDave Kleikamp 214ac27a0ecSDave Kleikamp return err; 215ac27a0ecSDave Kleikamp } 216617ba13bSMingming Cao case EXT4_IOC_GROUP_ADD: { 217617ba13bSMingming Cao struct ext4_new_group_data input; 218ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 2197ffe1ea8SHidehiro Kawai int err, err2; 220ac27a0ecSDave Kleikamp 221ac27a0ecSDave Kleikamp if (!capable(CAP_SYS_RESOURCE)) 222ac27a0ecSDave Kleikamp return -EPERM; 223ac27a0ecSDave Kleikamp 224617ba13bSMingming Cao if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 225ac27a0ecSDave Kleikamp sizeof(input))) 226ac27a0ecSDave Kleikamp return -EFAULT; 227ac27a0ecSDave Kleikamp 22842a74f20SDave Hansen err = mnt_want_write(filp->f_path.mnt); 22942a74f20SDave Hansen if (err) 23042a74f20SDave Hansen return err; 23142a74f20SDave Hansen 232617ba13bSMingming Cao err = ext4_group_add(sb, &input); 233dab291afSMingming Cao jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 2347ffe1ea8SHidehiro Kawai err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 235dab291afSMingming Cao jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2367ffe1ea8SHidehiro Kawai if (err == 0) 2377ffe1ea8SHidehiro Kawai err = err2; 23842a74f20SDave Hansen mnt_drop_write(filp->f_path.mnt); 239ac27a0ecSDave Kleikamp 240ac27a0ecSDave Kleikamp return err; 241ac27a0ecSDave Kleikamp } 242ac27a0ecSDave Kleikamp 243c14c6fd5SAneesh Kumar K.V case EXT4_IOC_MIGRATE: 2442a43a878SAneesh Kumar K.V { 2452a43a878SAneesh Kumar K.V int err; 2462a43a878SAneesh Kumar K.V if (!is_owner_or_cap(inode)) 2472a43a878SAneesh Kumar K.V return -EACCES; 2482a43a878SAneesh Kumar K.V 2492a43a878SAneesh Kumar K.V err = mnt_want_write(filp->f_path.mnt); 2502a43a878SAneesh Kumar K.V if (err) 2512a43a878SAneesh Kumar K.V return err; 2522a43a878SAneesh Kumar K.V /* 2532a43a878SAneesh Kumar K.V * inode_mutex prevent write and truncate on the file. 2542a43a878SAneesh Kumar K.V * Read still goes through. We take i_data_sem in 2552a43a878SAneesh Kumar K.V * ext4_ext_swap_inode_data before we switch the 2562a43a878SAneesh Kumar K.V * inode format to prevent read. 2572a43a878SAneesh Kumar K.V */ 2582a43a878SAneesh Kumar K.V mutex_lock(&(inode->i_mutex)); 2592a43a878SAneesh Kumar K.V err = ext4_ext_migrate(inode); 2602a43a878SAneesh Kumar K.V mutex_unlock(&(inode->i_mutex)); 2612a43a878SAneesh Kumar K.V mnt_drop_write(filp->f_path.mnt); 2622a43a878SAneesh Kumar K.V return err; 2632a43a878SAneesh Kumar K.V } 264c14c6fd5SAneesh Kumar K.V 265ccd2506bSTheodore Ts'o case EXT4_IOC_ALLOC_DA_BLKS: 266ccd2506bSTheodore Ts'o { 267ccd2506bSTheodore Ts'o int err; 268ccd2506bSTheodore Ts'o if (!is_owner_or_cap(inode)) 269ccd2506bSTheodore Ts'o return -EACCES; 270ccd2506bSTheodore Ts'o 271ccd2506bSTheodore Ts'o err = mnt_want_write(filp->f_path.mnt); 272ccd2506bSTheodore Ts'o if (err) 273ccd2506bSTheodore Ts'o return err; 274ccd2506bSTheodore Ts'o err = ext4_alloc_da_blocks(inode); 275ccd2506bSTheodore Ts'o mnt_drop_write(filp->f_path.mnt); 276ccd2506bSTheodore Ts'o return err; 277ccd2506bSTheodore Ts'o } 278ccd2506bSTheodore Ts'o 279ac27a0ecSDave Kleikamp default: 280ac27a0ecSDave Kleikamp return -ENOTTY; 281ac27a0ecSDave Kleikamp } 282ac27a0ecSDave Kleikamp } 283ac27a0ecSDave Kleikamp 284ac27a0ecSDave Kleikamp #ifdef CONFIG_COMPAT 285617ba13bSMingming Cao long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 286ac27a0ecSDave Kleikamp { 287ac27a0ecSDave Kleikamp /* These are just misnamed, they actually get/put from/to user an int */ 288ac27a0ecSDave Kleikamp switch (cmd) { 289617ba13bSMingming Cao case EXT4_IOC32_GETFLAGS: 290617ba13bSMingming Cao cmd = EXT4_IOC_GETFLAGS; 291ac27a0ecSDave Kleikamp break; 292617ba13bSMingming Cao case EXT4_IOC32_SETFLAGS: 293617ba13bSMingming Cao cmd = EXT4_IOC_SETFLAGS; 294ac27a0ecSDave Kleikamp break; 295617ba13bSMingming Cao case EXT4_IOC32_GETVERSION: 296617ba13bSMingming Cao cmd = EXT4_IOC_GETVERSION; 297ac27a0ecSDave Kleikamp break; 298617ba13bSMingming Cao case EXT4_IOC32_SETVERSION: 299617ba13bSMingming Cao cmd = EXT4_IOC_SETVERSION; 300ac27a0ecSDave Kleikamp break; 301617ba13bSMingming Cao case EXT4_IOC32_GROUP_EXTEND: 302617ba13bSMingming Cao cmd = EXT4_IOC_GROUP_EXTEND; 303ac27a0ecSDave Kleikamp break; 304617ba13bSMingming Cao case EXT4_IOC32_GETVERSION_OLD: 305617ba13bSMingming Cao cmd = EXT4_IOC_GETVERSION_OLD; 306ac27a0ecSDave Kleikamp break; 307617ba13bSMingming Cao case EXT4_IOC32_SETVERSION_OLD: 308617ba13bSMingming Cao cmd = EXT4_IOC_SETVERSION_OLD; 309ac27a0ecSDave Kleikamp break; 310e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 311617ba13bSMingming Cao case EXT4_IOC32_WAIT_FOR_READONLY: 312617ba13bSMingming Cao cmd = EXT4_IOC_WAIT_FOR_READONLY; 313ac27a0ecSDave Kleikamp break; 314ac27a0ecSDave Kleikamp #endif 315617ba13bSMingming Cao case EXT4_IOC32_GETRSVSZ: 316617ba13bSMingming Cao cmd = EXT4_IOC_GETRSVSZ; 317ac27a0ecSDave Kleikamp break; 318617ba13bSMingming Cao case EXT4_IOC32_SETRSVSZ: 319617ba13bSMingming Cao cmd = EXT4_IOC_SETRSVSZ; 320ac27a0ecSDave Kleikamp break; 321617ba13bSMingming Cao case EXT4_IOC_GROUP_ADD: 322ac27a0ecSDave Kleikamp break; 323ac27a0ecSDave Kleikamp default: 324ac27a0ecSDave Kleikamp return -ENOIOCTLCMD; 325ac27a0ecSDave Kleikamp } 3265cdd7b2dSAndi Kleen return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 327ac27a0ecSDave Kleikamp } 328ac27a0ecSDave Kleikamp #endif 329