linux/fs/nilfs2/ioctl.c
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   1/*
   2 * ioctl.c - NILFS ioctl operations.
   3 *
   4 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 *
  20 * Written by Koji Sato <koji@osrg.net>.
  21 */
  22
  23#include <linux/fs.h>
  24#include <linux/wait.h>
  25#include <linux/slab.h>
  26#include <linux/capability.h>   /* capable() */
  27#include <linux/uaccess.h>      /* copy_from_user(), copy_to_user() */
  28#include <linux/vmalloc.h>
  29#include <linux/compat.h>       /* compat_ptr() */
  30#include <linux/mount.h>        /* mnt_want_write_file(), mnt_drop_write_file() */
  31#include <linux/buffer_head.h>
  32#include <linux/nilfs2_fs.h>
  33#include "nilfs.h"
  34#include "segment.h"
  35#include "bmap.h"
  36#include "cpfile.h"
  37#include "sufile.h"
  38#include "dat.h"
  39
  40
  41static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
  42                                 struct nilfs_argv *argv, int dir,
  43                                 ssize_t (*dofunc)(struct the_nilfs *,
  44                                                   __u64 *, int,
  45                                                   void *, size_t, size_t))
  46{
  47        void *buf;
  48        void __user *base = (void __user *)(unsigned long)argv->v_base;
  49        size_t maxmembs, total, n;
  50        ssize_t nr;
  51        int ret, i;
  52        __u64 pos, ppos;
  53
  54        if (argv->v_nmembs == 0)
  55                return 0;
  56
  57        if (argv->v_size > PAGE_SIZE)
  58                return -EINVAL;
  59
  60        buf = (void *)__get_free_pages(GFP_NOFS, 0);
  61        if (unlikely(!buf))
  62                return -ENOMEM;
  63        maxmembs = PAGE_SIZE / argv->v_size;
  64
  65        ret = 0;
  66        total = 0;
  67        pos = argv->v_index;
  68        for (i = 0; i < argv->v_nmembs; i += n) {
  69                n = (argv->v_nmembs - i < maxmembs) ?
  70                        argv->v_nmembs - i : maxmembs;
  71                if ((dir & _IOC_WRITE) &&
  72                    copy_from_user(buf, base + argv->v_size * i,
  73                                   argv->v_size * n)) {
  74                        ret = -EFAULT;
  75                        break;
  76                }
  77                ppos = pos;
  78                nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
  79                               n);
  80                if (nr < 0) {
  81                        ret = nr;
  82                        break;
  83                }
  84                if ((dir & _IOC_READ) &&
  85                    copy_to_user(base + argv->v_size * i, buf,
  86                                 argv->v_size * nr)) {
  87                        ret = -EFAULT;
  88                        break;
  89                }
  90                total += nr;
  91                if ((size_t)nr < n)
  92                        break;
  93                if (pos == ppos)
  94                        pos += n;
  95        }
  96        argv->v_nmembs = total;
  97
  98        free_pages((unsigned long)buf, 0);
  99        return ret;
 100}
 101
 102static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
 103{
 104        unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
 105
 106        return put_user(flags, (int __user *)argp);
 107}
 108
 109static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
 110                                void __user *argp)
 111{
 112        struct nilfs_transaction_info ti;
 113        unsigned int flags, oldflags;
 114        int ret;
 115
 116        if (!inode_owner_or_capable(inode))
 117                return -EACCES;
 118
 119        if (get_user(flags, (int __user *)argp))
 120                return -EFAULT;
 121
 122        ret = mnt_want_write_file(filp);
 123        if (ret)
 124                return ret;
 125
 126        flags = nilfs_mask_flags(inode->i_mode, flags);
 127
 128        mutex_lock(&inode->i_mutex);
 129
 130        oldflags = NILFS_I(inode)->i_flags;
 131
 132        /*
 133         * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
 134         * relevant capability.
 135         */
 136        ret = -EPERM;
 137        if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
 138            !capable(CAP_LINUX_IMMUTABLE))
 139                goto out;
 140
 141        ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
 142        if (ret)
 143                goto out;
 144
 145        NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
 146                (flags & FS_FL_USER_MODIFIABLE);
 147
 148        nilfs_set_inode_flags(inode);
 149        inode->i_ctime = CURRENT_TIME;
 150        if (IS_SYNC(inode))
 151                nilfs_set_transaction_flag(NILFS_TI_SYNC);
 152
 153        nilfs_mark_inode_dirty(inode);
 154        ret = nilfs_transaction_commit(inode->i_sb);
 155out:
 156        mutex_unlock(&inode->i_mutex);
 157        mnt_drop_write_file(filp);
 158        return ret;
 159}
 160
 161static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
 162{
 163        return put_user(inode->i_generation, (int __user *)argp);
 164}
 165
 166static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
 167                                     unsigned int cmd, void __user *argp)
 168{
 169        struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 170        struct nilfs_transaction_info ti;
 171        struct nilfs_cpmode cpmode;
 172        int ret;
 173
 174        if (!capable(CAP_SYS_ADMIN))
 175                return -EPERM;
 176
 177        ret = mnt_want_write_file(filp);
 178        if (ret)
 179                return ret;
 180
 181        ret = -EFAULT;
 182        if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
 183                goto out;
 184
 185        mutex_lock(&nilfs->ns_snapshot_mount_mutex);
 186
 187        nilfs_transaction_begin(inode->i_sb, &ti, 0);
 188        ret = nilfs_cpfile_change_cpmode(
 189                nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
 190        if (unlikely(ret < 0))
 191                nilfs_transaction_abort(inode->i_sb);
 192        else
 193                nilfs_transaction_commit(inode->i_sb); /* never fails */
 194
 195        mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
 196out:
 197        mnt_drop_write_file(filp);
 198        return ret;
 199}
 200
 201static int
 202nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
 203                              unsigned int cmd, void __user *argp)
 204{
 205        struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 206        struct nilfs_transaction_info ti;
 207        __u64 cno;
 208        int ret;
 209
 210        if (!capable(CAP_SYS_ADMIN))
 211                return -EPERM;
 212
 213        ret = mnt_want_write_file(filp);
 214        if (ret)
 215                return ret;
 216
 217        ret = -EFAULT;
 218        if (copy_from_user(&cno, argp, sizeof(cno)))
 219                goto out;
 220
 221        nilfs_transaction_begin(inode->i_sb, &ti, 0);
 222        ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
 223        if (unlikely(ret < 0))
 224                nilfs_transaction_abort(inode->i_sb);
 225        else
 226                nilfs_transaction_commit(inode->i_sb); /* never fails */
 227out:
 228        mnt_drop_write_file(filp);
 229        return ret;
 230}
 231
 232static ssize_t
 233nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 234                          void *buf, size_t size, size_t nmembs)
 235{
 236        int ret;
 237
 238        down_read(&nilfs->ns_segctor_sem);
 239        ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
 240                                      size, nmembs);
 241        up_read(&nilfs->ns_segctor_sem);
 242        return ret;
 243}
 244
 245static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
 246                                  unsigned int cmd, void __user *argp)
 247{
 248        struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 249        struct nilfs_cpstat cpstat;
 250        int ret;
 251
 252        down_read(&nilfs->ns_segctor_sem);
 253        ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
 254        up_read(&nilfs->ns_segctor_sem);
 255        if (ret < 0)
 256                return ret;
 257
 258        if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
 259                ret = -EFAULT;
 260        return ret;
 261}
 262
 263static ssize_t
 264nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 265                          void *buf, size_t size, size_t nmembs)
 266{
 267        int ret;
 268
 269        down_read(&nilfs->ns_segctor_sem);
 270        ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
 271                                      nmembs);
 272        up_read(&nilfs->ns_segctor_sem);
 273        return ret;
 274}
 275
 276static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
 277                                  unsigned int cmd, void __user *argp)
 278{
 279        struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 280        struct nilfs_sustat sustat;
 281        int ret;
 282
 283        down_read(&nilfs->ns_segctor_sem);
 284        ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
 285        up_read(&nilfs->ns_segctor_sem);
 286        if (ret < 0)
 287                return ret;
 288
 289        if (copy_to_user(argp, &sustat, sizeof(sustat)))
 290                ret = -EFAULT;
 291        return ret;
 292}
 293
 294static ssize_t
 295nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 296                         void *buf, size_t size, size_t nmembs)
 297{
 298        int ret;
 299
 300        down_read(&nilfs->ns_segctor_sem);
 301        ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
 302        up_read(&nilfs->ns_segctor_sem);
 303        return ret;
 304}
 305
 306static ssize_t
 307nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
 308                          void *buf, size_t size, size_t nmembs)
 309{
 310        struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
 311        struct nilfs_bdesc *bdescs = buf;
 312        int ret, i;
 313
 314        down_read(&nilfs->ns_segctor_sem);
 315        for (i = 0; i < nmembs; i++) {
 316                ret = nilfs_bmap_lookup_at_level(bmap,
 317                                                 bdescs[i].bd_offset,
 318                                                 bdescs[i].bd_level + 1,
 319                                                 &bdescs[i].bd_blocknr);
 320                if (ret < 0) {
 321                        if (ret != -ENOENT) {
 322                                up_read(&nilfs->ns_segctor_sem);
 323                                return ret;
 324                        }
 325                        bdescs[i].bd_blocknr = 0;
 326                }
 327        }
 328        up_read(&nilfs->ns_segctor_sem);
 329        return nmembs;
 330}
 331
 332static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
 333                                  unsigned int cmd, void __user *argp)
 334{
 335        struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 336        struct nilfs_argv argv;
 337        int ret;
 338
 339        if (copy_from_user(&argv, argp, sizeof(argv)))
 340                return -EFAULT;
 341
 342        if (argv.v_size != sizeof(struct nilfs_bdesc))
 343                return -EINVAL;
 344
 345        ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 346                                    nilfs_ioctl_do_get_bdescs);
 347        if (ret < 0)
 348                return ret;
 349
 350        if (copy_to_user(argp, &argv, sizeof(argv)))
 351                ret = -EFAULT;
 352        return ret;
 353}
 354
 355static int nilfs_ioctl_move_inode_block(struct inode *inode,
 356                                        struct nilfs_vdesc *vdesc,
 357                                        struct list_head *buffers)
 358{
 359        struct buffer_head *bh;
 360        int ret;
 361
 362        if (vdesc->vd_flags == 0)
 363                ret = nilfs_gccache_submit_read_data(
 364                        inode, vdesc->vd_offset, vdesc->vd_blocknr,
 365                        vdesc->vd_vblocknr, &bh);
 366        else
 367                ret = nilfs_gccache_submit_read_node(
 368                        inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
 369
 370        if (unlikely(ret < 0)) {
 371                if (ret == -ENOENT)
 372                        printk(KERN_CRIT
 373                               "%s: invalid virtual block address (%s): "
 374                               "ino=%llu, cno=%llu, offset=%llu, "
 375                               "blocknr=%llu, vblocknr=%llu\n",
 376                               __func__, vdesc->vd_flags ? "node" : "data",
 377                               (unsigned long long)vdesc->vd_ino,
 378                               (unsigned long long)vdesc->vd_cno,
 379                               (unsigned long long)vdesc->vd_offset,
 380                               (unsigned long long)vdesc->vd_blocknr,
 381                               (unsigned long long)vdesc->vd_vblocknr);
 382                return ret;
 383        }
 384        if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
 385                printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
 386                       "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
 387                       __func__, vdesc->vd_flags ? "node" : "data",
 388                       (unsigned long long)vdesc->vd_ino,
 389                       (unsigned long long)vdesc->vd_cno,
 390                       (unsigned long long)vdesc->vd_offset,
 391                       (unsigned long long)vdesc->vd_blocknr,
 392                       (unsigned long long)vdesc->vd_vblocknr);
 393                brelse(bh);
 394                return -EEXIST;
 395        }
 396        list_add_tail(&bh->b_assoc_buffers, buffers);
 397        return 0;
 398}
 399
 400static int nilfs_ioctl_move_blocks(struct super_block *sb,
 401                                   struct nilfs_argv *argv, void *buf)
 402{
 403        size_t nmembs = argv->v_nmembs;
 404        struct the_nilfs *nilfs = sb->s_fs_info;
 405        struct inode *inode;
 406        struct nilfs_vdesc *vdesc;
 407        struct buffer_head *bh, *n;
 408        LIST_HEAD(buffers);
 409        ino_t ino;
 410        __u64 cno;
 411        int i, ret;
 412
 413        for (i = 0, vdesc = buf; i < nmembs; ) {
 414                ino = vdesc->vd_ino;
 415                cno = vdesc->vd_cno;
 416                inode = nilfs_iget_for_gc(sb, ino, cno);
 417                if (IS_ERR(inode)) {
 418                        ret = PTR_ERR(inode);
 419                        goto failed;
 420                }
 421                if (list_empty(&NILFS_I(inode)->i_dirty)) {
 422                        /*
 423                         * Add the inode to GC inode list. Garbage Collection
 424                         * is serialized and no two processes manipulate the
 425                         * list simultaneously.
 426                         */
 427                        igrab(inode);
 428                        list_add(&NILFS_I(inode)->i_dirty,
 429                                 &nilfs->ns_gc_inodes);
 430                }
 431
 432                do {
 433                        ret = nilfs_ioctl_move_inode_block(inode, vdesc,
 434                                                           &buffers);
 435                        if (unlikely(ret < 0)) {
 436                                iput(inode);
 437                                goto failed;
 438                        }
 439                        vdesc++;
 440                } while (++i < nmembs &&
 441                         vdesc->vd_ino == ino && vdesc->vd_cno == cno);
 442
 443                iput(inode); /* The inode still remains in GC inode list */
 444        }
 445
 446        list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 447                ret = nilfs_gccache_wait_and_mark_dirty(bh);
 448                if (unlikely(ret < 0)) {
 449                        WARN_ON(ret == -EEXIST);
 450                        goto failed;
 451                }
 452                list_del_init(&bh->b_assoc_buffers);
 453                brelse(bh);
 454        }
 455        return nmembs;
 456
 457 failed:
 458        list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 459                list_del_init(&bh->b_assoc_buffers);
 460                brelse(bh);
 461        }
 462        return ret;
 463}
 464
 465static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
 466                                          struct nilfs_argv *argv, void *buf)
 467{
 468        size_t nmembs = argv->v_nmembs;
 469        struct inode *cpfile = nilfs->ns_cpfile;
 470        struct nilfs_period *periods = buf;
 471        int ret, i;
 472
 473        for (i = 0; i < nmembs; i++) {
 474                ret = nilfs_cpfile_delete_checkpoints(
 475                        cpfile, periods[i].p_start, periods[i].p_end);
 476                if (ret < 0)
 477                        return ret;
 478        }
 479        return nmembs;
 480}
 481
 482static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
 483                                      struct nilfs_argv *argv, void *buf)
 484{
 485        size_t nmembs = argv->v_nmembs;
 486        int ret;
 487
 488        ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
 489
 490        return (ret < 0) ? ret : nmembs;
 491}
 492
 493static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 494                                         struct nilfs_argv *argv, void *buf)
 495{
 496        size_t nmembs = argv->v_nmembs;
 497        struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
 498        struct nilfs_bdesc *bdescs = buf;
 499        int ret, i;
 500
 501        for (i = 0; i < nmembs; i++) {
 502                /* XXX: use macro or inline func to check liveness */
 503                ret = nilfs_bmap_lookup_at_level(bmap,
 504                                                 bdescs[i].bd_offset,
 505                                                 bdescs[i].bd_level + 1,
 506                                                 &bdescs[i].bd_blocknr);
 507                if (ret < 0) {
 508                        if (ret != -ENOENT)
 509                                return ret;
 510                        bdescs[i].bd_blocknr = 0;
 511                }
 512                if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
 513                        /* skip dead block */
 514                        continue;
 515                if (bdescs[i].bd_level == 0) {
 516                        ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
 517                                                         bdescs[i].bd_offset);
 518                        if (ret < 0) {
 519                                WARN_ON(ret == -ENOENT);
 520                                return ret;
 521                        }
 522                } else {
 523                        ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
 524                                              bdescs[i].bd_level);
 525                        if (ret < 0) {
 526                                WARN_ON(ret == -ENOENT);
 527                                return ret;
 528                        }
 529                }
 530        }
 531        return nmembs;
 532}
 533
 534int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
 535                                       struct nilfs_argv *argv, void **kbufs)
 536{
 537        const char *msg;
 538        int ret;
 539
 540        ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
 541        if (ret < 0) {
 542                /*
 543                 * can safely abort because checkpoints can be removed
 544                 * independently.
 545                 */
 546                msg = "cannot delete checkpoints";
 547                goto failed;
 548        }
 549        ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
 550        if (ret < 0) {
 551                /*
 552                 * can safely abort because DAT file is updated atomically
 553                 * using a copy-on-write technique.
 554                 */
 555                msg = "cannot delete virtual blocks from DAT file";
 556                goto failed;
 557        }
 558        ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
 559        if (ret < 0) {
 560                /*
 561                 * can safely abort because the operation is nondestructive.
 562                 */
 563                msg = "cannot mark copying blocks dirty";
 564                goto failed;
 565        }
 566        return 0;
 567
 568 failed:
 569        printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
 570               msg, ret);
 571        return ret;
 572}
 573
 574static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
 575                                      unsigned int cmd, void __user *argp)
 576{
 577        struct nilfs_argv argv[5];
 578        static const size_t argsz[5] = {
 579                sizeof(struct nilfs_vdesc),
 580                sizeof(struct nilfs_period),
 581                sizeof(__u64),
 582                sizeof(struct nilfs_bdesc),
 583                sizeof(__u64),
 584        };
 585        void __user *base;
 586        void *kbufs[5];
 587        struct the_nilfs *nilfs;
 588        size_t len, nsegs;
 589        int n, ret;
 590
 591        if (!capable(CAP_SYS_ADMIN))
 592                return -EPERM;
 593
 594        ret = mnt_want_write_file(filp);
 595        if (ret)
 596                return ret;
 597
 598        ret = -EFAULT;
 599        if (copy_from_user(argv, argp, sizeof(argv)))
 600                goto out;
 601
 602        ret = -EINVAL;
 603        nsegs = argv[4].v_nmembs;
 604        if (argv[4].v_size != argsz[4])
 605                goto out;
 606        if (nsegs > UINT_MAX / sizeof(__u64))
 607                goto out;
 608
 609        /*
 610         * argv[4] points to segment numbers this ioctl cleans.  We
 611         * use kmalloc() for its buffer because memory used for the
 612         * segment numbers is enough small.
 613         */
 614        kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
 615                               nsegs * sizeof(__u64));
 616        if (IS_ERR(kbufs[4])) {
 617                ret = PTR_ERR(kbufs[4]);
 618                goto out;
 619        }
 620        nilfs = inode->i_sb->s_fs_info;
 621
 622        for (n = 0; n < 4; n++) {
 623                ret = -EINVAL;
 624                if (argv[n].v_size != argsz[n])
 625                        goto out_free;
 626
 627                if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
 628                        goto out_free;
 629
 630                if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
 631                        goto out_free;
 632
 633                len = argv[n].v_size * argv[n].v_nmembs;
 634                base = (void __user *)(unsigned long)argv[n].v_base;
 635                if (len == 0) {
 636                        kbufs[n] = NULL;
 637                        continue;
 638                }
 639
 640                kbufs[n] = vmalloc(len);
 641                if (!kbufs[n]) {
 642                        ret = -ENOMEM;
 643                        goto out_free;
 644                }
 645                if (copy_from_user(kbufs[n], base, len)) {
 646                        ret = -EFAULT;
 647                        vfree(kbufs[n]);
 648                        goto out_free;
 649                }
 650        }
 651
 652        /*
 653         * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
 654         * which will operates an inode list without blocking.
 655         * To protect the list from concurrent operations,
 656         * nilfs_ioctl_move_blocks should be atomic operation.
 657         */
 658        if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
 659                ret = -EBUSY;
 660                goto out_free;
 661        }
 662
 663        ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
 664        if (ret < 0)
 665                printk(KERN_ERR "NILFS: GC failed during preparation: "
 666                        "cannot read source blocks: err=%d\n", ret);
 667        else
 668                ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
 669
 670        nilfs_remove_all_gcinodes(nilfs);
 671        clear_nilfs_gc_running(nilfs);
 672
 673out_free:
 674        while (--n >= 0)
 675                vfree(kbufs[n]);
 676        kfree(kbufs[4]);
 677out:
 678        mnt_drop_write_file(filp);
 679        return ret;
 680}
 681
 682static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
 683                            unsigned int cmd, void __user *argp)
 684{
 685        __u64 cno;
 686        int ret;
 687        struct the_nilfs *nilfs;
 688
 689        ret = nilfs_construct_segment(inode->i_sb);
 690        if (ret < 0)
 691                return ret;
 692
 693        nilfs = inode->i_sb->s_fs_info;
 694        if (nilfs_test_opt(nilfs, BARRIER)) {
 695                ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 696                if (ret == -EIO)
 697                        return ret;
 698        }
 699
 700        if (argp != NULL) {
 701                down_read(&nilfs->ns_segctor_sem);
 702                cno = nilfs->ns_cno - 1;
 703                up_read(&nilfs->ns_segctor_sem);
 704                if (copy_to_user(argp, &cno, sizeof(cno)))
 705                        return -EFAULT;
 706        }
 707        return 0;
 708}
 709
 710static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
 711                              void __user *argp)
 712{
 713        __u64 newsize;
 714        int ret = -EPERM;
 715
 716        if (!capable(CAP_SYS_ADMIN))
 717                goto out;
 718
 719        ret = mnt_want_write_file(filp);
 720        if (ret)
 721                goto out;
 722
 723        ret = -EFAULT;
 724        if (copy_from_user(&newsize, argp, sizeof(newsize)))
 725                goto out_drop_write;
 726
 727        ret = nilfs_resize_fs(inode->i_sb, newsize);
 728
 729out_drop_write:
 730        mnt_drop_write_file(filp);
 731out:
 732        return ret;
 733}
 734
 735static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
 736{
 737        struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 738        __u64 range[2];
 739        __u64 minseg, maxseg;
 740        unsigned long segbytes;
 741        int ret = -EPERM;
 742
 743        if (!capable(CAP_SYS_ADMIN))
 744                goto out;
 745
 746        ret = -EFAULT;
 747        if (copy_from_user(range, argp, sizeof(__u64[2])))
 748                goto out;
 749
 750        ret = -ERANGE;
 751        if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
 752                goto out;
 753
 754        segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
 755
 756        minseg = range[0] + segbytes - 1;
 757        do_div(minseg, segbytes);
 758        maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
 759        do_div(maxseg, segbytes);
 760        maxseg--;
 761
 762        ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
 763out:
 764        return ret;
 765}
 766
 767static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
 768                                unsigned int cmd, void __user *argp,
 769                                size_t membsz,
 770                                ssize_t (*dofunc)(struct the_nilfs *,
 771                                                  __u64 *, int,
 772                                                  void *, size_t, size_t))
 773
 774{
 775        struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 776        struct nilfs_argv argv;
 777        int ret;
 778
 779        if (copy_from_user(&argv, argp, sizeof(argv)))
 780                return -EFAULT;
 781
 782        if (argv.v_size < membsz)
 783                return -EINVAL;
 784
 785        ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
 786        if (ret < 0)
 787                return ret;
 788
 789        if (copy_to_user(argp, &argv, sizeof(argv)))
 790                ret = -EFAULT;
 791        return ret;
 792}
 793
 794long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 795{
 796        struct inode *inode = filp->f_dentry->d_inode;
 797        void __user *argp = (void __user *)arg;
 798
 799        switch (cmd) {
 800        case FS_IOC_GETFLAGS:
 801                return nilfs_ioctl_getflags(inode, argp);
 802        case FS_IOC_SETFLAGS:
 803                return nilfs_ioctl_setflags(inode, filp, argp);
 804        case FS_IOC_GETVERSION:
 805                return nilfs_ioctl_getversion(inode, argp);
 806        case NILFS_IOCTL_CHANGE_CPMODE:
 807                return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
 808        case NILFS_IOCTL_DELETE_CHECKPOINT:
 809                return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
 810        case NILFS_IOCTL_GET_CPINFO:
 811                return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 812                                            sizeof(struct nilfs_cpinfo),
 813                                            nilfs_ioctl_do_get_cpinfo);
 814        case NILFS_IOCTL_GET_CPSTAT:
 815                return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
 816        case NILFS_IOCTL_GET_SUINFO:
 817                return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 818                                            sizeof(struct nilfs_suinfo),
 819                                            nilfs_ioctl_do_get_suinfo);
 820        case NILFS_IOCTL_GET_SUSTAT:
 821                return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
 822        case NILFS_IOCTL_GET_VINFO:
 823                return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 824                                            sizeof(struct nilfs_vinfo),
 825                                            nilfs_ioctl_do_get_vinfo);
 826        case NILFS_IOCTL_GET_BDESCS:
 827                return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
 828        case NILFS_IOCTL_CLEAN_SEGMENTS:
 829                return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
 830        case NILFS_IOCTL_SYNC:
 831                return nilfs_ioctl_sync(inode, filp, cmd, argp);
 832        case NILFS_IOCTL_RESIZE:
 833                return nilfs_ioctl_resize(inode, filp, argp);
 834        case NILFS_IOCTL_SET_ALLOC_RANGE:
 835                return nilfs_ioctl_set_alloc_range(inode, argp);
 836        default:
 837                return -ENOTTY;
 838        }
 839}
 840
 841#ifdef CONFIG_COMPAT
 842long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 843{
 844        switch (cmd) {
 845        case FS_IOC32_GETFLAGS:
 846                cmd = FS_IOC_GETFLAGS;
 847                break;
 848        case FS_IOC32_SETFLAGS:
 849                cmd = FS_IOC_SETFLAGS;
 850                break;
 851        case FS_IOC32_GETVERSION:
 852                cmd = FS_IOC_GETVERSION;
 853                break;
 854        case NILFS_IOCTL_CHANGE_CPMODE:
 855        case NILFS_IOCTL_DELETE_CHECKPOINT:
 856        case NILFS_IOCTL_GET_CPINFO:
 857        case NILFS_IOCTL_GET_CPSTAT:
 858        case NILFS_IOCTL_GET_SUINFO:
 859        case NILFS_IOCTL_GET_SUSTAT:
 860        case NILFS_IOCTL_GET_VINFO:
 861        case NILFS_IOCTL_GET_BDESCS:
 862        case NILFS_IOCTL_CLEAN_SEGMENTS:
 863        case NILFS_IOCTL_SYNC:
 864        case NILFS_IOCTL_RESIZE:
 865        case NILFS_IOCTL_SET_ALLOC_RANGE:
 866                break;
 867        default:
 868                return -ENOIOCTLCMD;
 869        }
 870        return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
 871}
 872#endif
 873
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