fs/nilfs2/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * ioctl.c - NILFS ioctl operations.
   4  *
   5  * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
   6  *
   7  * Written by Koji Sato.
   8  */
   9
  10 #include <linux/fs.h>
  11 #include <linux/wait.h>
  12 #include <linux/slab.h>
  13 #include <linux/capability.h>   /* capable() */
  14 #include <linux/uaccess.h>      /* copy_from_user(), copy_to_user() */
  15 #include <linux/vmalloc.h>
  16 #include <linux/compat.h>       /* compat_ptr() */
  17 #include <linux/mount.h>        /* mnt_want_write_file(), mnt_drop_write_file() */
  18 #include <linux/buffer_head.h>
  19 #include "nilfs.h"
  20 #include "segment.h"
  21 #include "bmap.h"
  22 #include "cpfile.h"
  23 #include "sufile.h"
  24 #include "dat.h"
  25
  26 /**
  27  * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
  28  * @nilfs: nilfs object
  29  * @argv: vector of arguments from userspace
  30  * @dir: set of direction flags
  31  * @dofunc: concrete function of get/set metadata info
  32  *
  33  * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
  34  * calling dofunc() function on the basis of @argv argument.
  35  *
  36  * Return Value: On success, 0 is returned and requested metadata info
  37  * is copied into userspace. On error, one of the following
  38  * negative error codes is returned.
  39  *
  40  * %-EINVAL - Invalid arguments from userspace.
  41  *
  42  * %-ENOMEM - Insufficient amount of memory available.
  43  *
  44  * %-EFAULT - Failure during execution of requested operation.
  45  */
  46 static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
  47                                  struct nilfs_argv *argv, int dir,
  48                                  ssize_t (*dofunc)(struct the_nilfs *,
  49                                                    __u64 *, int,
  50                                                    void *, size_t, size_t))
  51 {
  52         void *buf;
  53         void __user *base = (void __user *)(unsigned long)argv->v_base;
  54         size_t maxmembs, total, n;
  55         ssize_t nr;
  56         int ret, i;
  57         __u64 pos, ppos;
  58
  59         if (argv->v_nmembs == 0)
  60                 return 0;
  61
  62         if (argv->v_size > PAGE_SIZE)
  63                 return -EINVAL;
  64
  65         /*
  66          * Reject pairs of a start item position (argv->v_index) and a
  67          * total count (argv->v_nmembs) which leads position 'pos' to
  68          * overflow by the increment at the end of the loop.
  69          */
  70         if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
  71                 return -EINVAL;
  72
  73         buf = (void *)__get_free_pages(GFP_NOFS, 0);
  74         if (unlikely(!buf))
  75                 return -ENOMEM;
  76         maxmembs = PAGE_SIZE / argv->v_size;
  77
  78         ret = 0;
  79         total = 0;
  80         pos = argv->v_index;
  81         for (i = 0; i < argv->v_nmembs; i += n) {
  82                 n = (argv->v_nmembs - i < maxmembs) ?
  83                         argv->v_nmembs - i : maxmembs;
  84                 if ((dir & _IOC_WRITE) &&
  85                     copy_from_user(buf, base + argv->v_size * i,
  86                                    argv->v_size * n)) {
  87                         ret = -EFAULT;
  88                         break;
  89                 }
  90                 ppos = pos;
  91                 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
  92                                n);
  93                 if (nr < 0) {
  94                         ret = nr;
  95                         break;
  96                 }
  97                 if ((dir & _IOC_READ) &&
  98                     copy_to_user(base + argv->v_size * i, buf,
  99                                  argv->v_size * nr)) {
 100                         ret = -EFAULT;
 101                         break;
 102                 }
 103                 total += nr;
 104                 if ((size_t)nr < n)
 105                         break;
 106                 if (pos == ppos)
 107                         pos += n;
 108         }
 109         argv->v_nmembs = total;
 110
 111         free_pages((unsigned long)buf, 0);
 112         return ret;
 113 }
 114
 115 /**
 116  * nilfs_ioctl_getflags - ioctl to support lsattr
 117  */
 118 static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
 119 {
 120         unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
 121
 122         return put_user(flags, (int __user *)argp);
 123 }
 124
 125 /**
 126  * nilfs_ioctl_setflags - ioctl to support chattr
 127  */
 128 static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
 129                                 void __user *argp)
 130 {
 131         struct nilfs_transaction_info ti;
 132         unsigned int flags, oldflags;
 133         int ret;
 134
 135         if (!inode_owner_or_capable(inode))
 136                 return -EACCES;
 137
 138         if (get_user(flags, (int __user *)argp))
 139                 return -EFAULT;
 140
 141         ret = mnt_want_write_file(filp);
 142         if (ret)
 143                 return ret;
 144
 145         flags = nilfs_mask_flags(inode->i_mode, flags);
 146
 147         inode_lock(inode);
 148
 149         oldflags = NILFS_I(inode)->i_flags;
 150
 151         /*
 152          * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
 153          * relevant capability.
 154          */
 155         ret = -EPERM;
 156         if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
 157             !capable(CAP_LINUX_IMMUTABLE))
 158                 goto out;
 159
 160         ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
 161         if (ret)
 162                 goto out;
 163
 164         NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
 165                 (flags & FS_FL_USER_MODIFIABLE);
 166
 167         nilfs_set_inode_flags(inode);
 168         inode->i_ctime = current_time(inode);
 169         if (IS_SYNC(inode))
 170                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
 171
 172         nilfs_mark_inode_dirty(inode);
 173         ret = nilfs_transaction_commit(inode->i_sb);
 174 out:
 175         inode_unlock(inode);
 176         mnt_drop_write_file(filp);
 177         return ret;
 178 }
 179
 180 /**
 181  * nilfs_ioctl_getversion - get info about a file's version (generation number)
 182  */
 183 static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
 184 {
 185         return put_user(inode->i_generation, (int __user *)argp);
 186 }
 187
 188 /**
 189  * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
 190  * @inode: inode object
 191  * @filp: file object
 192  * @cmd: ioctl's request code
 193  * @argp: pointer on argument from userspace
 194  *
 195  * Description: nilfs_ioctl_change_cpmode() function changes mode of
 196  * given checkpoint between checkpoint and snapshot state. This ioctl
 197  * is used in chcp and mkcp utilities.
 198  *
 199  * Return Value: On success, 0 is returned and mode of a checkpoint is
 200  * changed. On error, one of the following negative error codes
 201  * is returned.
 202  *
 203  * %-EPERM - Operation not permitted.
 204  *
 205  * %-EFAULT - Failure during checkpoint mode changing.
 206  */
 207 static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
 208                                      unsigned int cmd, void __user *argp)
 209 {
 210         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 211         struct nilfs_transaction_info ti;
 212         struct nilfs_cpmode cpmode;
 213         int ret;
 214
 215         if (!capable(CAP_SYS_ADMIN))
 216                 return -EPERM;
 217
 218         ret = mnt_want_write_file(filp);
 219         if (ret)
 220                 return ret;
 221
 222         ret = -EFAULT;
 223         if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
 224                 goto out;
 225
 226         mutex_lock(&nilfs->ns_snapshot_mount_mutex);
 227
 228         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 229         ret = nilfs_cpfile_change_cpmode(
 230                 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
 231         if (unlikely(ret < 0))
 232                 nilfs_transaction_abort(inode->i_sb);
 233         else
 234                 nilfs_transaction_commit(inode->i_sb); /* never fails */
 235
 236         mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
 237 out:
 238         mnt_drop_write_file(filp);
 239         return ret;
 240 }
 241
 242 /**
 243  * nilfs_ioctl_delete_checkpoint - remove checkpoint
 244  * @inode: inode object
 245  * @filp: file object
 246  * @cmd: ioctl's request code
 247  * @argp: pointer on argument from userspace
 248  *
 249  * Description: nilfs_ioctl_delete_checkpoint() function removes
 250  * checkpoint from NILFS2 file system. This ioctl is used in rmcp
 251  * utility.
 252  *
 253  * Return Value: On success, 0 is returned and a checkpoint is
 254  * removed. On error, one of the following negative error codes
 255  * is returned.
 256  *
 257  * %-EPERM - Operation not permitted.
 258  *
 259  * %-EFAULT - Failure during checkpoint removing.
 260  */
 261 static int
 262 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
 263                               unsigned int cmd, void __user *argp)
 264 {
 265         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 266         struct nilfs_transaction_info ti;
 267         __u64 cno;
 268         int ret;
 269
 270         if (!capable(CAP_SYS_ADMIN))
 271                 return -EPERM;
 272
 273         ret = mnt_want_write_file(filp);
 274         if (ret)
 275                 return ret;
 276
 277         ret = -EFAULT;
 278         if (copy_from_user(&cno, argp, sizeof(cno)))
 279                 goto out;
 280
 281         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 282         ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
 283         if (unlikely(ret < 0))
 284                 nilfs_transaction_abort(inode->i_sb);
 285         else
 286                 nilfs_transaction_commit(inode->i_sb); /* never fails */
 287 out:
 288         mnt_drop_write_file(filp);
 289         return ret;
 290 }
 291
 292 /**
 293  * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
 294  * @nilfs: nilfs object
 295  * @posp: pointer on array of checkpoint's numbers
 296  * @flags: checkpoint mode (checkpoint or snapshot)
 297  * @buf: buffer for storing checkponts' info
 298  * @size: size in bytes of one checkpoint info item in array
 299  * @nmembs: number of checkpoints in array (numbers and infos)
 300  *
 301  * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
 302  * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
 303  * lscp utility and by nilfs_cleanerd daemon.
 304  *
 305  * Return value: count of nilfs_cpinfo structures in output buffer.
 306  */
 307 static ssize_t
 308 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 309                           void *buf, size_t size, size_t nmembs)
 310 {
 311         int ret;
 312
 313         down_read(&nilfs->ns_segctor_sem);
 314         ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
 315                                       size, nmembs);
 316         up_read(&nilfs->ns_segctor_sem);
 317         return ret;
 318 }
 319
 320 /**
 321  * nilfs_ioctl_get_cpstat - get checkpoints statistics
 322  * @inode: inode object
 323  * @filp: file object
 324  * @cmd: ioctl's request code
 325  * @argp: pointer on argument from userspace
 326  *
 327  * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
 328  * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
 329  * and by nilfs_cleanerd daemon.
 330  *
 331  * Return Value: On success, 0 is returned, and checkpoints information is
 332  * copied into userspace pointer @argp. On error, one of the following
 333  * negative error codes is returned.
 334  *
 335  * %-EIO - I/O error.
 336  *
 337  * %-ENOMEM - Insufficient amount of memory available.
 338  *
 339  * %-EFAULT - Failure during getting checkpoints statistics.
 340  */
 341 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
 342                                   unsigned int cmd, void __user *argp)
 343 {
 344         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 345         struct nilfs_cpstat cpstat;
 346         int ret;
 347
 348         down_read(&nilfs->ns_segctor_sem);
 349         ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
 350         up_read(&nilfs->ns_segctor_sem);
 351         if (ret < 0)
 352                 return ret;
 353
 354         if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
 355                 ret = -EFAULT;
 356         return ret;
 357 }
 358
 359 /**
 360  * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
 361  * @nilfs: nilfs object
 362  * @posp: pointer on array of segment numbers
 363  * @flags: *not used*
 364  * @buf: buffer for storing suinfo array
 365  * @size: size in bytes of one suinfo item in array
 366  * @nmembs: count of segment numbers and suinfos in array
 367  *
 368  * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
 369  * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
 370  * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
 371  *
 372  * Return value: count of nilfs_suinfo structures in output buffer.
 373  */
 374 static ssize_t
 375 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 376                           void *buf, size_t size, size_t nmembs)
 377 {
 378         int ret;
 379
 380         down_read(&nilfs->ns_segctor_sem);
 381         ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
 382                                       nmembs);
 383         up_read(&nilfs->ns_segctor_sem);
 384         return ret;
 385 }
 386
 387 /**
 388  * nilfs_ioctl_get_sustat - get segment usage statistics
 389  * @inode: inode object
 390  * @filp: file object
 391  * @cmd: ioctl's request code
 392  * @argp: pointer on argument from userspace
 393  *
 394  * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
 395  * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
 396  * and by nilfs_cleanerd daemon.
 397  *
 398  * Return Value: On success, 0 is returned, and segment usage information is
 399  * copied into userspace pointer @argp. On error, one of the following
 400  * negative error codes is returned.
 401  *
 402  * %-EIO - I/O error.
 403  *
 404  * %-ENOMEM - Insufficient amount of memory available.
 405  *
 406  * %-EFAULT - Failure during getting segment usage statistics.
 407  */
 408 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
 409                                   unsigned int cmd, void __user *argp)
 410 {
 411         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 412         struct nilfs_sustat sustat;
 413         int ret;
 414
 415         down_read(&nilfs->ns_segctor_sem);
 416         ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
 417         up_read(&nilfs->ns_segctor_sem);
 418         if (ret < 0)
 419                 return ret;
 420
 421         if (copy_to_user(argp, &sustat, sizeof(sustat)))
 422                 ret = -EFAULT;
 423         return ret;
 424 }
 425
 426 /**
 427  * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
 428  * @nilfs: nilfs object
 429  * @posp: *not used*
 430  * @flags: *not used*
 431  * @buf: buffer for storing array of nilfs_vinfo structures
 432  * @size: size in bytes of one vinfo item in array
 433  * @nmembs: count of vinfos in array
 434  *
 435  * Description: nilfs_ioctl_do_get_vinfo() function returns information
 436  * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
 437  * by nilfs_cleanerd daemon.
 438  *
 439  * Return value: count of nilfs_vinfo structures in output buffer.
 440  */
 441 static ssize_t
 442 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 443                          void *buf, size_t size, size_t nmembs)
 444 {
 445         int ret;
 446
 447         down_read(&nilfs->ns_segctor_sem);
 448         ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
 449         up_read(&nilfs->ns_segctor_sem);
 450         return ret;
 451 }
 452
 453 /**
 454  * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
 455  * @nilfs: nilfs object
 456  * @posp: *not used*
 457  * @flags: *not used*
 458  * @buf: buffer for storing array of nilfs_bdesc structures
 459  * @size: size in bytes of one bdesc item in array
 460  * @nmembs: count of bdescs in array
 461  *
 462  * Description: nilfs_ioctl_do_get_bdescs() function returns information
 463  * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
 464  * is used by nilfs_cleanerd daemon.
 465  *
 466  * Return value: count of nilfs_bdescs structures in output buffer.
 467  */
 468 static ssize_t
 469 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
 470                           void *buf, size_t size, size_t nmembs)
 471 {
 472         struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
 473         struct nilfs_bdesc *bdescs = buf;
 474         int ret, i;
 475
 476         down_read(&nilfs->ns_segctor_sem);
 477         for (i = 0; i < nmembs; i++) {
 478                 ret = nilfs_bmap_lookup_at_level(bmap,
 479                                                  bdescs[i].bd_offset,
 480                                                  bdescs[i].bd_level + 1,
 481                                                  &bdescs[i].bd_blocknr);
 482                 if (ret < 0) {
 483                         if (ret != -ENOENT) {
 484                                 up_read(&nilfs->ns_segctor_sem);
 485                                 return ret;
 486                         }
 487                         bdescs[i].bd_blocknr = 0;
 488                 }
 489         }
 490         up_read(&nilfs->ns_segctor_sem);
 491         return nmembs;
 492 }
 493
 494 /**
 495  * nilfs_ioctl_get_bdescs - get disk block descriptors
 496  * @inode: inode object
 497  * @filp: file object
 498  * @cmd: ioctl's request code
 499  * @argp: pointer on argument from userspace
 500  *
 501  * Description: nilfs_ioctl_do_get_bdescs() function returns information
 502  * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
 503  * is used by nilfs_cleanerd daemon.
 504  *
 505  * Return Value: On success, 0 is returned, and disk block descriptors are
 506  * copied into userspace pointer @argp. On error, one of the following
 507  * negative error codes is returned.
 508  *
 509  * %-EINVAL - Invalid arguments from userspace.
 510  *
 511  * %-EIO - I/O error.
 512  *
 513  * %-ENOMEM - Insufficient amount of memory available.
 514  *
 515  * %-EFAULT - Failure during getting disk block descriptors.
 516  */
 517 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
 518                                   unsigned int cmd, void __user *argp)
 519 {
 520         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 521         struct nilfs_argv argv;
 522         int ret;
 523
 524         if (copy_from_user(&argv, argp, sizeof(argv)))
 525                 return -EFAULT;
 526
 527         if (argv.v_size != sizeof(struct nilfs_bdesc))
 528                 return -EINVAL;
 529
 530         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 531                                     nilfs_ioctl_do_get_bdescs);
 532         if (ret < 0)
 533                 return ret;
 534
 535         if (copy_to_user(argp, &argv, sizeof(argv)))
 536                 ret = -EFAULT;
 537         return ret;
 538 }
 539
 540 /**
 541  * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
 542  * @inode: inode object
 543  * @vdesc: descriptor of virtual block number
 544  * @buffers: list of moving buffers
 545  *
 546  * Description: nilfs_ioctl_move_inode_block() function registers data/node
 547  * buffer in the GC pagecache and submit read request.
 548  *
 549  * Return Value: On success, 0 is returned. On error, one of the following
 550  * negative error codes is returned.
 551  *
 552  * %-EIO - I/O error.
 553  *
 554  * %-ENOMEM - Insufficient amount of memory available.
 555  *
 556  * %-ENOENT - Requested block doesn't exist.
 557  *
 558  * %-EEXIST - Blocks conflict is detected.
 559  */
 560 static int nilfs_ioctl_move_inode_block(struct inode *inode,
 561                                         struct nilfs_vdesc *vdesc,
 562                                         struct list_head *buffers)
 563 {
 564         struct buffer_head *bh;
 565         int ret;
 566
 567         if (vdesc->vd_flags == 0)
 568                 ret = nilfs_gccache_submit_read_data(
 569                         inode, vdesc->vd_offset, vdesc->vd_blocknr,
 570                         vdesc->vd_vblocknr, &bh);
 571         else
 572                 ret = nilfs_gccache_submit_read_node(
 573                         inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
 574
 575         if (unlikely(ret < 0)) {
 576                 if (ret == -ENOENT)
 577                         nilfs_msg(inode->i_sb, KERN_CRIT,
 578                                   "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
 579                                   __func__, vdesc->vd_flags ? "node" : "data",
 580                                   (unsigned long long)vdesc->vd_ino,
 581                                   (unsigned long long)vdesc->vd_cno,
 582                                   (unsigned long long)vdesc->vd_offset,
 583                                   (unsigned long long)vdesc->vd_blocknr,
 584                                   (unsigned long long)vdesc->vd_vblocknr);
 585                 return ret;
 586         }
 587         if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
 588                 nilfs_msg(inode->i_sb, KERN_CRIT,
 589                           "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
 590                           __func__, vdesc->vd_flags ? "node" : "data",
 591                           (unsigned long long)vdesc->vd_ino,
 592                           (unsigned long long)vdesc->vd_cno,
 593                           (unsigned long long)vdesc->vd_offset,
 594                           (unsigned long long)vdesc->vd_blocknr,
 595                           (unsigned long long)vdesc->vd_vblocknr);
 596                 brelse(bh);
 597                 return -EEXIST;
 598         }
 599         list_add_tail(&bh->b_assoc_buffers, buffers);
 600         return 0;
 601 }
 602
 603 /**
 604  * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
 605  * @sb: superblock object
 606  * @argv: vector of arguments from userspace
 607  * @buf: array of nilfs_vdesc structures
 608  *
 609  * Description: nilfs_ioctl_move_blocks() function reads valid data/node
 610  * blocks that garbage collector specified with the array of nilfs_vdesc
 611  * structures and stores them into page caches of GC inodes.
 612  *
 613  * Return Value: Number of processed nilfs_vdesc structures or
 614  * error code, otherwise.
 615  */
 616 static int nilfs_ioctl_move_blocks(struct super_block *sb,
 617                                    struct nilfs_argv *argv, void *buf)
 618 {
 619         size_t nmembs = argv->v_nmembs;
 620         struct the_nilfs *nilfs = sb->s_fs_info;
 621         struct inode *inode;
 622         struct nilfs_vdesc *vdesc;
 623         struct buffer_head *bh, *n;
 624         LIST_HEAD(buffers);
 625         ino_t ino;
 626         __u64 cno;
 627         int i, ret;
 628
 629         for (i = 0, vdesc = buf; i < nmembs; ) {
 630                 ino = vdesc->vd_ino;
 631                 cno = vdesc->vd_cno;
 632                 inode = nilfs_iget_for_gc(sb, ino, cno);
 633                 if (IS_ERR(inode)) {
 634                         ret = PTR_ERR(inode);
 635                         goto failed;
 636                 }
 637                 if (list_empty(&NILFS_I(inode)->i_dirty)) {
 638                         /*
 639                          * Add the inode to GC inode list. Garbage Collection
 640                          * is serialized and no two processes manipulate the
 641                          * list simultaneously.
 642                          */
 643                         igrab(inode);
 644                         list_add(&NILFS_I(inode)->i_dirty,
 645                                  &nilfs->ns_gc_inodes);
 646                 }
 647
 648                 do {
 649                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
 650                                                            &buffers);
 651                         if (unlikely(ret < 0)) {
 652                                 iput(inode);
 653                                 goto failed;
 654                         }
 655                         vdesc++;
 656                 } while (++i < nmembs &&
 657                          vdesc->vd_ino == ino && vdesc->vd_cno == cno);
 658
 659                 iput(inode); /* The inode still remains in GC inode list */
 660         }
 661
 662         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 663                 ret = nilfs_gccache_wait_and_mark_dirty(bh);
 664                 if (unlikely(ret < 0)) {
 665                         WARN_ON(ret == -EEXIST);
 666                         goto failed;
 667                 }
 668                 list_del_init(&bh->b_assoc_buffers);
 669                 brelse(bh);
 670         }
 671         return nmembs;
 672
 673  failed:
 674         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 675                 list_del_init(&bh->b_assoc_buffers);
 676                 brelse(bh);
 677         }
 678         return ret;
 679 }
 680
 681 /**
 682  * nilfs_ioctl_delete_checkpoints - delete checkpoints
 683  * @nilfs: nilfs object
 684  * @argv: vector of arguments from userspace
 685  * @buf: array of periods of checkpoints numbers
 686  *
 687  * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
 688  * in the period from p_start to p_end, excluding p_end itself. The checkpoints
 689  * which have been already deleted are ignored.
 690  *
 691  * Return Value: Number of processed nilfs_period structures or
 692  * error code, otherwise.
 693  *
 694  * %-EIO - I/O error.
 695  *
 696  * %-ENOMEM - Insufficient amount of memory available.
 697  *
 698  * %-EINVAL - invalid checkpoints.
 699  */
 700 static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
 701                                           struct nilfs_argv *argv, void *buf)
 702 {
 703         size_t nmembs = argv->v_nmembs;
 704         struct inode *cpfile = nilfs->ns_cpfile;
 705         struct nilfs_period *periods = buf;
 706         int ret, i;
 707
 708         for (i = 0; i < nmembs; i++) {
 709                 ret = nilfs_cpfile_delete_checkpoints(
 710                         cpfile, periods[i].p_start, periods[i].p_end);
 711                 if (ret < 0)
 712                         return ret;
 713         }
 714         return nmembs;
 715 }
 716
 717 /**
 718  * nilfs_ioctl_free_vblocknrs - free virtual block numbers
 719  * @nilfs: nilfs object
 720  * @argv: vector of arguments from userspace
 721  * @buf: array of virtual block numbers
 722  *
 723  * Description: nilfs_ioctl_free_vblocknrs() function frees
 724  * the virtual block numbers specified by @buf and @argv->v_nmembs.
 725  *
 726  * Return Value: Number of processed virtual block numbers or
 727  * error code, otherwise.
 728  *
 729  * %-EIO - I/O error.
 730  *
 731  * %-ENOMEM - Insufficient amount of memory available.
 732  *
 733  * %-ENOENT - The virtual block number have not been allocated.
 734  */
 735 static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
 736                                       struct nilfs_argv *argv, void *buf)
 737 {
 738         size_t nmembs = argv->v_nmembs;
 739         int ret;
 740
 741         ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
 742
 743         return (ret < 0) ? ret : nmembs;
 744 }
 745
 746 /**
 747  * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
 748  * @nilfs: nilfs object
 749  * @argv: vector of arguments from userspace
 750  * @buf: array of block descriptors
 751  *
 752  * Description: nilfs_ioctl_mark_blocks_dirty() function marks
 753  * metadata file or data blocks as dirty.
 754  *
 755  * Return Value: Number of processed block descriptors or
 756  * error code, otherwise.
 757  *
 758  * %-ENOMEM - Insufficient memory available.
 759  *
 760  * %-EIO - I/O error
 761  *
 762  * %-ENOENT - the specified block does not exist (hole block)
 763  */
 764 static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 765                                          struct nilfs_argv *argv, void *buf)
 766 {
 767         size_t nmembs = argv->v_nmembs;
 768         struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
 769         struct nilfs_bdesc *bdescs = buf;
 770         struct buffer_head *bh;
 771         int ret, i;
 772
 773         for (i = 0; i < nmembs; i++) {
 774                 /* XXX: use macro or inline func to check liveness */
 775                 ret = nilfs_bmap_lookup_at_level(bmap,
 776                                                  bdescs[i].bd_offset,
 777                                                  bdescs[i].bd_level + 1,
 778                                                  &bdescs[i].bd_blocknr);
 779                 if (ret < 0) {
 780                         if (ret != -ENOENT)
 781                                 return ret;
 782                         bdescs[i].bd_blocknr = 0;
 783                 }
 784                 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
 785                         /* skip dead block */
 786                         continue;
 787                 if (bdescs[i].bd_level == 0) {
 788                         ret = nilfs_mdt_get_block(nilfs->ns_dat,
 789                                                   bdescs[i].bd_offset,
 790                                                   false, NULL, &bh);
 791                         if (unlikely(ret)) {
 792                                 WARN_ON(ret == -ENOENT);
 793                                 return ret;
 794                         }
 795                         mark_buffer_dirty(bh);
 796                         nilfs_mdt_mark_dirty(nilfs->ns_dat);
 797                         put_bh(bh);
 798                 } else {
 799                         ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
 800                                               bdescs[i].bd_level);
 801                         if (ret < 0) {
 802                                 WARN_ON(ret == -ENOENT);
 803                                 return ret;
 804                         }
 805                 }
 806         }
 807         return nmembs;
 808 }
 809
 810 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
 811                                        struct nilfs_argv *argv, void **kbufs)
 812 {
 813         const char *msg;
 814         int ret;
 815
 816         ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
 817         if (ret < 0) {
 818                 /*
 819                  * can safely abort because checkpoints can be removed
 820                  * independently.
 821                  */
 822                 msg = "cannot delete checkpoints";
 823                 goto failed;
 824         }
 825         ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
 826         if (ret < 0) {
 827                 /*
 828                  * can safely abort because DAT file is updated atomically
 829                  * using a copy-on-write technique.
 830                  */
 831                 msg = "cannot delete virtual blocks from DAT file";
 832                 goto failed;
 833         }
 834         ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
 835         if (ret < 0) {
 836                 /*
 837                  * can safely abort because the operation is nondestructive.
 838                  */
 839                 msg = "cannot mark copying blocks dirty";
 840                 goto failed;
 841         }
 842         return 0;
 843
 844  failed:
 845         nilfs_msg(nilfs->ns_sb, KERN_ERR, "error %d preparing GC: %s", ret,
 846                   msg);
 847         return ret;
 848 }
 849
 850 /**
 851  * nilfs_ioctl_clean_segments - clean segments
 852  * @inode: inode object
 853  * @filp: file object
 854  * @cmd: ioctl's request code
 855  * @argp: pointer on argument from userspace
 856  *
 857  * Description: nilfs_ioctl_clean_segments() function makes garbage
 858  * collection operation in the environment of requested parameters
 859  * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
 860  * nilfs_cleanerd daemon.
 861  *
 862  * Return Value: On success, 0 is returned or error code, otherwise.
 863  */
 864 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
 865                                       unsigned int cmd, void __user *argp)
 866 {
 867         struct nilfs_argv argv[5];
 868         static const size_t argsz[5] = {
 869                 sizeof(struct nilfs_vdesc),
 870                 sizeof(struct nilfs_period),
 871                 sizeof(__u64),
 872                 sizeof(struct nilfs_bdesc),
 873                 sizeof(__u64),
 874         };
 875         void __user *base;
 876         void *kbufs[5];
 877         struct the_nilfs *nilfs;
 878         size_t len, nsegs;
 879         int n, ret;
 880
 881         if (!capable(CAP_SYS_ADMIN))
 882                 return -EPERM;
 883
 884         ret = mnt_want_write_file(filp);
 885         if (ret)
 886                 return ret;
 887
 888         ret = -EFAULT;
 889         if (copy_from_user(argv, argp, sizeof(argv)))
 890                 goto out;
 891
 892         ret = -EINVAL;
 893         nsegs = argv[4].v_nmembs;
 894         if (argv[4].v_size != argsz[4])
 895                 goto out;
 896         if (nsegs > UINT_MAX / sizeof(__u64))
 897                 goto out;
 898
 899         /*
 900          * argv[4] points to segment numbers this ioctl cleans.  We
 901          * use kmalloc() for its buffer because memory used for the
 902          * segment numbers is enough small.
 903          */
 904         kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
 905                                nsegs * sizeof(__u64));
 906         if (IS_ERR(kbufs[4])) {
 907                 ret = PTR_ERR(kbufs[4]);
 908                 goto out;
 909         }
 910         nilfs = inode->i_sb->s_fs_info;
 911
 912         for (n = 0; n < 4; n++) {
 913                 ret = -EINVAL;
 914                 if (argv[n].v_size != argsz[n])
 915                         goto out_free;
 916
 917                 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
 918                         goto out_free;
 919
 920                 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
 921                         goto out_free;
 922
 923                 len = argv[n].v_size * argv[n].v_nmembs;
 924                 base = (void __user *)(unsigned long)argv[n].v_base;
 925                 if (len == 0) {
 926                         kbufs[n] = NULL;
 927                         continue;
 928                 }
 929
 930                 kbufs[n] = vmalloc(len);
 931                 if (!kbufs[n]) {
 932                         ret = -ENOMEM;
 933                         goto out_free;
 934                 }
 935                 if (copy_from_user(kbufs[n], base, len)) {
 936                         ret = -EFAULT;
 937                         vfree(kbufs[n]);
 938                         goto out_free;
 939                 }
 940         }
 941
 942         /*
 943          * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
 944          * which will operates an inode list without blocking.
 945          * To protect the list from concurrent operations,
 946          * nilfs_ioctl_move_blocks should be atomic operation.
 947          */
 948         if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
 949                 ret = -EBUSY;
 950                 goto out_free;
 951         }
 952
 953         ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
 954         if (ret < 0) {
 955                 nilfs_msg(inode->i_sb, KERN_ERR,
 956                           "error %d preparing GC: cannot read source blocks",
 957                           ret);
 958         } else {
 959                 if (nilfs_sb_need_update(nilfs))
 960                         set_nilfs_discontinued(nilfs);
 961                 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
 962         }
 963
 964         nilfs_remove_all_gcinodes(nilfs);
 965         clear_nilfs_gc_running(nilfs);
 966
 967 out_free:
 968         while (--n >= 0)
 969                 vfree(kbufs[n]);
 970         kfree(kbufs[4]);
 971 out:
 972         mnt_drop_write_file(filp);
 973         return ret;
 974 }
 975
 976 /**
 977  * nilfs_ioctl_sync - make a checkpoint
 978  * @inode: inode object
 979  * @filp: file object
 980  * @cmd: ioctl's request code
 981  * @argp: pointer on argument from userspace
 982  *
 983  * Description: nilfs_ioctl_sync() function constructs a logical segment
 984  * for checkpointing.  This function guarantees that all modified data
 985  * and metadata are written out to the device when it successfully
 986  * returned.
 987  *
 988  * Return Value: On success, 0 is retured. On errors, one of the following
 989  * negative error code is returned.
 990  *
 991  * %-EROFS - Read only filesystem.
 992  *
 993  * %-EIO - I/O error
 994  *
 995  * %-ENOSPC - No space left on device (only in a panic state).
 996  *
 997  * %-ERESTARTSYS - Interrupted.
 998  *
 999  * %-ENOMEM - Insufficient memory available.
1000  *
1001  * %-EFAULT - Failure during execution of requested operation.
1002  */
1003 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
1004                             unsigned int cmd, void __user *argp)
1005 {
1006         __u64 cno;
1007         int ret;
1008         struct the_nilfs *nilfs;
1009
1010         ret = nilfs_construct_segment(inode->i_sb);
1011         if (ret < 0)
1012                 return ret;
1013
1014         nilfs = inode->i_sb->s_fs_info;
1015         ret = nilfs_flush_device(nilfs);
1016         if (ret < 0)
1017                 return ret;
1018
1019         if (argp != NULL) {
1020                 down_read(&nilfs->ns_segctor_sem);
1021                 cno = nilfs->ns_cno - 1;
1022                 up_read(&nilfs->ns_segctor_sem);
1023                 if (copy_to_user(argp, &cno, sizeof(cno)))
1024                         return -EFAULT;
1025         }
1026         return 0;
1027 }
1028
1029 /**
1030  * nilfs_ioctl_resize - resize NILFS2 volume
1031  * @inode: inode object
1032  * @filp: file object
1033  * @argp: pointer on argument from userspace
1034  *
1035  * Return Value: On success, 0 is returned or error code, otherwise.
1036  */
1037 static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1038                               void __user *argp)
1039 {
1040         __u64 newsize;
1041         int ret = -EPERM;
1042
1043         if (!capable(CAP_SYS_ADMIN))
1044                 goto out;
1045
1046         ret = mnt_want_write_file(filp);
1047         if (ret)
1048                 goto out;
1049
1050         ret = -EFAULT;
1051         if (copy_from_user(&newsize, argp, sizeof(newsize)))
1052                 goto out_drop_write;
1053
1054         ret = nilfs_resize_fs(inode->i_sb, newsize);
1055
1056 out_drop_write:
1057         mnt_drop_write_file(filp);
1058 out:
1059         return ret;
1060 }
1061
1062 /**
1063  * nilfs_ioctl_trim_fs() - trim ioctl handle function
1064  * @inode: inode object
1065  * @argp: pointer on argument from userspace
1066  *
1067  * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1068  * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1069  * performs the actual trim operation.
1070  *
1071  * Return Value: On success, 0 is returned or negative error code, otherwise.
1072  */
1073 static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1074 {
1075         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1076         struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
1077         struct fstrim_range range;
1078         int ret;
1079
1080         if (!capable(CAP_SYS_ADMIN))
1081                 return -EPERM;
1082
1083         if (!blk_queue_discard(q))
1084                 return -EOPNOTSUPP;
1085
1086         if (copy_from_user(&range, argp, sizeof(range)))
1087                 return -EFAULT;
1088
1089         range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
1090
1091         down_read(&nilfs->ns_segctor_sem);
1092         ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1093         up_read(&nilfs->ns_segctor_sem);
1094
1095         if (ret < 0)
1096                 return ret;
1097
1098         if (copy_to_user(argp, &range, sizeof(range)))
1099                 return -EFAULT;
1100
1101         return 0;
1102 }
1103
1104 /**
1105  * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1106  * @inode: inode object
1107  * @argp: pointer on argument from userspace
1108  *
1109  * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
1110  * of segments in bytes and upper limit of segments in bytes.
1111  * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1112  *
1113  * Return Value: On success, 0 is returned or error code, otherwise.
1114  */
1115 static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1116 {
1117         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1118         __u64 range[2];
1119         __u64 minseg, maxseg;
1120         unsigned long segbytes;
1121         int ret = -EPERM;
1122
1123         if (!capable(CAP_SYS_ADMIN))
1124                 goto out;
1125
1126         ret = -EFAULT;
1127         if (copy_from_user(range, argp, sizeof(__u64[2])))
1128                 goto out;
1129
1130         ret = -ERANGE;
1131         if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
1132                 goto out;
1133
1134         segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1135
1136         minseg = range[0] + segbytes - 1;
1137         do_div(minseg, segbytes);
1138         maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1139         do_div(maxseg, segbytes);
1140         maxseg--;
1141
1142         ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1143 out:
1144         return ret;
1145 }
1146
1147 /**
1148  * nilfs_ioctl_get_info - wrapping function of get metadata info
1149  * @inode: inode object
1150  * @filp: file object
1151  * @cmd: ioctl's request code
1152  * @argp: pointer on argument from userspace
1153  * @membsz: size of an item in bytes
1154  * @dofunc: concrete function of getting metadata info
1155  *
1156  * Description: nilfs_ioctl_get_info() gets metadata info by means of
1157  * calling dofunc() function.
1158  *
1159  * Return Value: On success, 0 is returned and requested metadata info
1160  * is copied into userspace. On error, one of the following
1161  * negative error codes is returned.
1162  *
1163  * %-EINVAL - Invalid arguments from userspace.
1164  *
1165  * %-ENOMEM - Insufficient amount of memory available.
1166  *
1167  * %-EFAULT - Failure during execution of requested operation.
1168  */
1169 static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1170                                 unsigned int cmd, void __user *argp,
1171                                 size_t membsz,
1172                                 ssize_t (*dofunc)(struct the_nilfs *,
1173                                                   __u64 *, int,
1174                                                   void *, size_t, size_t))
1175
1176 {
1177         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1178         struct nilfs_argv argv;
1179         int ret;
1180
1181         if (copy_from_user(&argv, argp, sizeof(argv)))
1182                 return -EFAULT;
1183
1184         if (argv.v_size < membsz)
1185                 return -EINVAL;
1186
1187         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1188         if (ret < 0)
1189                 return ret;
1190
1191         if (copy_to_user(argp, &argv, sizeof(argv)))
1192                 ret = -EFAULT;
1193         return ret;
1194 }
1195
1196 /**
1197  * nilfs_ioctl_set_suinfo - set segment usage info
1198  * @inode: inode object
1199  * @filp: file object
1200  * @cmd: ioctl's request code
1201  * @argp: pointer on argument from userspace
1202  *
1203  * Description: Expects an array of nilfs_suinfo_update structures
1204  * encapsulated in nilfs_argv and updates the segment usage info
1205  * according to the flags in nilfs_suinfo_update.
1206  *
1207  * Return Value: On success, 0 is returned. On error, one of the
1208  * following negative error codes is returned.
1209  *
1210  * %-EPERM - Not enough permissions
1211  *
1212  * %-EFAULT - Error copying input data
1213  *
1214  * %-EIO - I/O error.
1215  *
1216  * %-ENOMEM - Insufficient amount of memory available.
1217  *
1218  * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1219  */
1220 static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1221                                 unsigned int cmd, void __user *argp)
1222 {
1223         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1224         struct nilfs_transaction_info ti;
1225         struct nilfs_argv argv;
1226         size_t len;
1227         void __user *base;
1228         void *kbuf;
1229         int ret;
1230
1231         if (!capable(CAP_SYS_ADMIN))
1232                 return -EPERM;
1233
1234         ret = mnt_want_write_file(filp);
1235         if (ret)
1236                 return ret;
1237
1238         ret = -EFAULT;
1239         if (copy_from_user(&argv, argp, sizeof(argv)))
1240                 goto out;
1241
1242         ret = -EINVAL;
1243         if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1244                 goto out;
1245
1246         if (argv.v_nmembs > nilfs->ns_nsegments)
1247                 goto out;
1248
1249         if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1250                 goto out;
1251
1252         len = argv.v_size * argv.v_nmembs;
1253         if (!len) {
1254                 ret = 0;
1255                 goto out;
1256         }
1257
1258         base = (void __user *)(unsigned long)argv.v_base;
1259         kbuf = vmalloc(len);
1260         if (!kbuf) {
1261                 ret = -ENOMEM;
1262                 goto out;
1263         }
1264
1265         if (copy_from_user(kbuf, base, len)) {
1266                 ret = -EFAULT;
1267                 goto out_free;
1268         }
1269
1270         nilfs_transaction_begin(inode->i_sb, &ti, 0);
1271         ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1272                         argv.v_nmembs);
1273         if (unlikely(ret < 0))
1274                 nilfs_transaction_abort(inode->i_sb);
1275         else
1276                 nilfs_transaction_commit(inode->i_sb); /* never fails */
1277
1278 out_free:
1279         vfree(kbuf);
1280 out:
1281         mnt_drop_write_file(filp);
1282         return ret;
1283 }
1284
1285 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1286 {
1287         struct inode *inode = file_inode(filp);
1288         void __user *argp = (void __user *)arg;
1289
1290         switch (cmd) {
1291         case FS_IOC_GETFLAGS:
1292                 return nilfs_ioctl_getflags(inode, argp);
1293         case FS_IOC_SETFLAGS:
1294                 return nilfs_ioctl_setflags(inode, filp, argp);
1295         case FS_IOC_GETVERSION:
1296                 return nilfs_ioctl_getversion(inode, argp);
1297         case NILFS_IOCTL_CHANGE_CPMODE:
1298                 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1299         case NILFS_IOCTL_DELETE_CHECKPOINT:
1300                 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1301         case NILFS_IOCTL_GET_CPINFO:
1302                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1303                                             sizeof(struct nilfs_cpinfo),
1304                                             nilfs_ioctl_do_get_cpinfo);
1305         case NILFS_IOCTL_GET_CPSTAT:
1306                 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1307         case NILFS_IOCTL_GET_SUINFO:
1308                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1309                                             sizeof(struct nilfs_suinfo),
1310                                             nilfs_ioctl_do_get_suinfo);
1311         case NILFS_IOCTL_SET_SUINFO:
1312                 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
1313         case NILFS_IOCTL_GET_SUSTAT:
1314                 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1315         case NILFS_IOCTL_GET_VINFO:
1316                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1317                                             sizeof(struct nilfs_vinfo),
1318                                             nilfs_ioctl_do_get_vinfo);
1319         case NILFS_IOCTL_GET_BDESCS:
1320                 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1321         case NILFS_IOCTL_CLEAN_SEGMENTS:
1322                 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
1323         case NILFS_IOCTL_SYNC:
1324                 return nilfs_ioctl_sync(inode, filp, cmd, argp);
1325         case NILFS_IOCTL_RESIZE:
1326                 return nilfs_ioctl_resize(inode, filp, argp);
1327         case NILFS_IOCTL_SET_ALLOC_RANGE:
1328                 return nilfs_ioctl_set_alloc_range(inode, argp);
1329         case FITRIM:
1330                 return nilfs_ioctl_trim_fs(inode, argp);
1331         default:
1332                 return -ENOTTY;
1333         }
1334 }
1335
1336 #ifdef CONFIG_COMPAT
1337 long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1338 {
1339         switch (cmd) {
1340         case FS_IOC32_GETFLAGS:
1341                 cmd = FS_IOC_GETFLAGS;
1342                 break;
1343         case FS_IOC32_SETFLAGS:
1344                 cmd = FS_IOC_SETFLAGS;
1345                 break;
1346         case FS_IOC32_GETVERSION:
1347                 cmd = FS_IOC_GETVERSION;
1348                 break;
1349         case NILFS_IOCTL_CHANGE_CPMODE:
1350         case NILFS_IOCTL_DELETE_CHECKPOINT:
1351         case NILFS_IOCTL_GET_CPINFO:
1352         case NILFS_IOCTL_GET_CPSTAT:
1353         case NILFS_IOCTL_GET_SUINFO:
1354         case NILFS_IOCTL_SET_SUINFO:
1355         case NILFS_IOCTL_GET_SUSTAT:
1356         case NILFS_IOCTL_GET_VINFO:
1357         case NILFS_IOCTL_GET_BDESCS:
1358         case NILFS_IOCTL_CLEAN_SEGMENTS:
1359         case NILFS_IOCTL_SYNC:
1360         case NILFS_IOCTL_RESIZE:
1361         case NILFS_IOCTL_SET_ALLOC_RANGE:
1362                 break;
1363         default:
1364                 return -ENOIOCTLCMD;
1365         }
1366         return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1367 }
1368 #endif