SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/xfs/linux-2.6/xfs_super.c

   1 /*
   2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_bit.h"
  20 #include "xfs_log.h"
  21 #include "xfs_clnt.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_dir2.h"
  27 #include "xfs_alloc.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_quota.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_ialloc_btree.h"
  34 #include "xfs_dir2_sf.h"
  35 #include "xfs_attr_sf.h"
  36 #include "xfs_dinode.h"
  37 #include "xfs_inode.h"
  38 #include "xfs_btree.h"
  39 #include "xfs_ialloc.h"
  40 #include "xfs_bmap.h"
  41 #include "xfs_rtalloc.h"
  42 #include "xfs_error.h"
  43 #include "xfs_itable.h"
  44 #include "xfs_rw.h"
  45 #include "xfs_acl.h"
  46 #include "xfs_attr.h"
  47 #include "xfs_buf_item.h"
  48 #include "xfs_utils.h"
  49 #include "xfs_version.h"
  50
  51 #include <linux/namei.h>
  52 #include <linux/init.h>
  53 #include <linux/mount.h>
  54 #include <linux/mempool.h>
  55 #include <linux/writeback.h>
  56 #include <linux/kthread.h>
  57 #include <linux/freezer.h>
  58
  59 static struct quotactl_ops xfs_quotactl_operations;
  60 static struct super_operations xfs_super_operations;
  61 static kmem_zone_t *xfs_vnode_zone;
  62 static kmem_zone_t *xfs_ioend_zone;
  63 mempool_t *xfs_ioend_pool;
  64
  65 STATIC struct xfs_mount_args *
  66 xfs_args_allocate(
  67         struct super_block      *sb,
  68         int                     silent)
  69 {
  70         struct xfs_mount_args   *args;
  71
  72         args = kmem_zalloc(sizeof(struct xfs_mount_args), KM_SLEEP);
  73         args->logbufs = args->logbufsize = -1;
  74         strncpy(args->fsname, sb->s_id, MAXNAMELEN);
  75
  76         /* Copy the already-parsed mount(2) flags we're interested in */
  77         if (sb->s_flags & MS_DIRSYNC)
  78                 args->flags |= XFSMNT_DIRSYNC;
  79         if (sb->s_flags & MS_SYNCHRONOUS)
  80                 args->flags |= XFSMNT_WSYNC;
  81         if (silent)
  82                 args->flags |= XFSMNT_QUIET;
  83         args->flags |= XFSMNT_32BITINODES;
  84
  85         return args;
  86 }
  87
  88 __uint64_t
  89 xfs_max_file_offset(
  90         unsigned int            blockshift)
  91 {
  92         unsigned int            pagefactor = 1;
  93         unsigned int            bitshift = BITS_PER_LONG - 1;
  94
  95         /* Figure out maximum filesize, on Linux this can depend on
  96          * the filesystem blocksize (on 32 bit platforms).
  97          * __block_prepare_write does this in an [unsigned] long...
  98          *      page->index << (PAGE_CACHE_SHIFT - bbits)
  99          * So, for page sized blocks (4K on 32 bit platforms),
 100          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 101          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
 102          * but for smaller blocksizes it is less (bbits = log2 bsize).
 103          * Note1: get_block_t takes a long (implicit cast from above)
 104          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
 105          * can optionally convert the [unsigned] long from above into
 106          * an [unsigned] long long.
 107          */
 108
 109 #if BITS_PER_LONG == 32
 110 # if defined(CONFIG_LBD)
 111         ASSERT(sizeof(sector_t) == 8);
 112         pagefactor = PAGE_CACHE_SIZE;
 113         bitshift = BITS_PER_LONG;
 114 # else
 115         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
 116 # endif
 117 #endif
 118
 119         return (((__uint64_t)pagefactor) << bitshift) - 1;
 120 }
 121
 122 STATIC_INLINE void
 123 xfs_set_inodeops(
 124         struct inode            *inode)
 125 {
 126         switch (inode->i_mode & S_IFMT) {
 127         case S_IFREG:
 128                 inode->i_op = &xfs_inode_operations;
 129                 inode->i_fop = &xfs_file_operations;
 130                 inode->i_mapping->a_ops = &xfs_address_space_operations;
 131                 break;
 132         case S_IFDIR:
 133                 inode->i_op = &xfs_dir_inode_operations;
 134                 inode->i_fop = &xfs_dir_file_operations;
 135                 break;
 136         case S_IFLNK:
 137                 inode->i_op = &xfs_symlink_inode_operations;
 138                 if (inode->i_blocks)
 139                         inode->i_mapping->a_ops = &xfs_address_space_operations;
 140                 break;
 141         default:
 142                 inode->i_op = &xfs_inode_operations;
 143                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 144                 break;
 145         }
 146 }
 147
 148 STATIC_INLINE void
 149 xfs_revalidate_inode(
 150         xfs_mount_t             *mp,
 151         bhv_vnode_t             *vp,
 152         xfs_inode_t             *ip)
 153 {
 154         struct inode            *inode = vn_to_inode(vp);
 155
 156         inode->i_mode   = ip->i_d.di_mode;
 157         inode->i_nlink  = ip->i_d.di_nlink;
 158         inode->i_uid    = ip->i_d.di_uid;
 159         inode->i_gid    = ip->i_d.di_gid;
 160
 161         switch (inode->i_mode & S_IFMT) {
 162         case S_IFBLK:
 163         case S_IFCHR:
 164                 inode->i_rdev =
 165                         MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
 166                               sysv_minor(ip->i_df.if_u2.if_rdev));
 167                 break;
 168         default:
 169                 inode->i_rdev = 0;
 170                 break;
 171         }
 172
 173         inode->i_generation = ip->i_d.di_gen;
 174         i_size_write(inode, ip->i_d.di_size);
 175         inode->i_blocks =
 176                 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
 177         inode->i_atime.tv_sec   = ip->i_d.di_atime.t_sec;
 178         inode->i_atime.tv_nsec  = ip->i_d.di_atime.t_nsec;
 179         inode->i_mtime.tv_sec   = ip->i_d.di_mtime.t_sec;
 180         inode->i_mtime.tv_nsec  = ip->i_d.di_mtime.t_nsec;
 181         inode->i_ctime.tv_sec   = ip->i_d.di_ctime.t_sec;
 182         inode->i_ctime.tv_nsec  = ip->i_d.di_ctime.t_nsec;
 183         if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
 184                 inode->i_flags |= S_IMMUTABLE;
 185         else
 186                 inode->i_flags &= ~S_IMMUTABLE;
 187         if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
 188                 inode->i_flags |= S_APPEND;
 189         else
 190                 inode->i_flags &= ~S_APPEND;
 191         if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
 192                 inode->i_flags |= S_SYNC;
 193         else
 194                 inode->i_flags &= ~S_SYNC;
 195         if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
 196                 inode->i_flags |= S_NOATIME;
 197         else
 198                 inode->i_flags &= ~S_NOATIME;
 199         vp->v_flag &= ~VMODIFIED;
 200 }
 201
 202 void
 203 xfs_initialize_vnode(
 204         bhv_desc_t              *bdp,
 205         bhv_vnode_t             *vp,
 206         bhv_desc_t              *inode_bhv,
 207         int                     unlock)
 208 {
 209         xfs_inode_t             *ip = XFS_BHVTOI(inode_bhv);
 210         struct inode            *inode = vn_to_inode(vp);
 211
 212         if (!inode_bhv->bd_vobj) {
 213                 vp->v_vfsp = bhvtovfs(bdp);
 214                 bhv_desc_init(inode_bhv, ip, vp, &xfs_vnodeops);
 215                 bhv_insert(VN_BHV_HEAD(vp), inode_bhv);
 216         }
 217
 218         /*
 219          * We need to set the ops vectors, and unlock the inode, but if
 220          * we have been called during the new inode create process, it is
 221          * too early to fill in the Linux inode.  We will get called a
 222          * second time once the inode is properly set up, and then we can
 223          * finish our work.
 224          */
 225         if (ip->i_d.di_mode != 0 && unlock && (inode->i_state & I_NEW)) {
 226                 xfs_revalidate_inode(XFS_BHVTOM(bdp), vp, ip);
 227                 xfs_set_inodeops(inode);
 228
 229                 xfs_iflags_clear(ip, XFS_INEW);
 230                 barrier();
 231
 232                 unlock_new_inode(inode);
 233         }
 234 }
 235
 236 int
 237 xfs_blkdev_get(
 238         xfs_mount_t             *mp,
 239         const char              *name,
 240         struct block_device     **bdevp)
 241 {
 242         int                     error = 0;
 243
 244         *bdevp = open_bdev_excl(name, 0, mp);
 245         if (IS_ERR(*bdevp)) {
 246                 error = PTR_ERR(*bdevp);
 247                 printk("XFS: Invalid device [%s], error=%d\n", name, error);
 248         }
 249
 250         return -error;
 251 }
 252
 253 void
 254 xfs_blkdev_put(
 255         struct block_device     *bdev)
 256 {
 257         if (bdev)
 258                 close_bdev_excl(bdev);
 259 }
 260
 261 /*
 262  * Try to write out the superblock using barriers.
 263  */
 264 STATIC int
 265 xfs_barrier_test(
 266         xfs_mount_t     *mp)
 267 {
 268         xfs_buf_t       *sbp = xfs_getsb(mp, 0);
 269         int             error;
 270
 271         XFS_BUF_UNDONE(sbp);
 272         XFS_BUF_UNREAD(sbp);
 273         XFS_BUF_UNDELAYWRITE(sbp);
 274         XFS_BUF_WRITE(sbp);
 275         XFS_BUF_UNASYNC(sbp);
 276         XFS_BUF_ORDERED(sbp);
 277
 278         xfsbdstrat(mp, sbp);
 279         error = xfs_iowait(sbp);
 280
 281         /*
 282          * Clear all the flags we set and possible error state in the
 283          * buffer.  We only did the write to try out whether barriers
 284          * worked and shouldn't leave any traces in the superblock
 285          * buffer.
 286          */
 287         XFS_BUF_DONE(sbp);
 288         XFS_BUF_ERROR(sbp, 0);
 289         XFS_BUF_UNORDERED(sbp);
 290
 291         xfs_buf_relse(sbp);
 292         return error;
 293 }
 294
 295 void
 296 xfs_mountfs_check_barriers(xfs_mount_t *mp)
 297 {
 298         int error;
 299
 300         if (mp->m_logdev_targp != mp->m_ddev_targp) {
 301                 xfs_fs_cmn_err(CE_NOTE, mp,
 302                   "Disabling barriers, not supported with external log device");
 303                 mp->m_flags &= ~XFS_MOUNT_BARRIER;
 304                 return;
 305         }
 306
 307         if (mp->m_ddev_targp->bt_bdev->bd_disk->queue->ordered ==
 308                                         QUEUE_ORDERED_NONE) {
 309                 xfs_fs_cmn_err(CE_NOTE, mp,
 310                   "Disabling barriers, not supported by the underlying device");
 311                 mp->m_flags &= ~XFS_MOUNT_BARRIER;
 312                 return;
 313         }
 314
 315         if (xfs_readonly_buftarg(mp->m_ddev_targp)) {
 316                 xfs_fs_cmn_err(CE_NOTE, mp,
 317                   "Disabling barriers, underlying device is readonly");
 318                 mp->m_flags &= ~XFS_MOUNT_BARRIER;
 319                 return;
 320         }
 321
 322         error = xfs_barrier_test(mp);
 323         if (error) {
 324                 xfs_fs_cmn_err(CE_NOTE, mp,
 325                   "Disabling barriers, trial barrier write failed");
 326                 mp->m_flags &= ~XFS_MOUNT_BARRIER;
 327                 return;
 328         }
 329 }
 330
 331 void
 332 xfs_blkdev_issue_flush(
 333         xfs_buftarg_t           *buftarg)
 334 {
 335         blkdev_issue_flush(buftarg->bt_bdev, NULL);
 336 }
 337
 338 STATIC struct inode *
 339 xfs_fs_alloc_inode(
 340         struct super_block      *sb)
 341 {
 342         bhv_vnode_t             *vp;
 343
 344         vp = kmem_zone_alloc(xfs_vnode_zone, KM_SLEEP);
 345         if (unlikely(!vp))
 346                 return NULL;
 347         return vn_to_inode(vp);
 348 }
 349
 350 STATIC void
 351 xfs_fs_destroy_inode(
 352         struct inode            *inode)
 353 {
 354         kmem_zone_free(xfs_vnode_zone, vn_from_inode(inode));
 355 }
 356
 357 STATIC void
 358 xfs_fs_inode_init_once(
 359         void                    *vnode,
 360         kmem_zone_t             *zonep,
 361         unsigned long           flags)
 362 {
 363         inode_init_once(vn_to_inode((bhv_vnode_t *)vnode));
 364 }
 365
 366 STATIC int
 367 xfs_init_zones(void)
 368 {
 369         xfs_vnode_zone = kmem_zone_init_flags(sizeof(bhv_vnode_t), "xfs_vnode",
 370                                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
 371                                         KM_ZONE_SPREAD,
 372                                         xfs_fs_inode_init_once);
 373         if (!xfs_vnode_zone)
 374                 goto out;
 375
 376         xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
 377         if (!xfs_ioend_zone)
 378                 goto out_destroy_vnode_zone;
 379
 380         xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
 381                                                   xfs_ioend_zone);
 382         if (!xfs_ioend_pool)
 383                 goto out_free_ioend_zone;
 384         return 0;
 385
 386  out_free_ioend_zone:
 387         kmem_zone_destroy(xfs_ioend_zone);
 388  out_destroy_vnode_zone:
 389         kmem_zone_destroy(xfs_vnode_zone);
 390  out:
 391         return -ENOMEM;
 392 }
 393
 394 STATIC void
 395 xfs_destroy_zones(void)
 396 {
 397         mempool_destroy(xfs_ioend_pool);
 398         kmem_zone_destroy(xfs_vnode_zone);
 399         kmem_zone_destroy(xfs_ioend_zone);
 400 }
 401
 402 /*
 403  * Attempt to flush the inode, this will actually fail
 404  * if the inode is pinned, but we dirty the inode again
 405  * at the point when it is unpinned after a log write,
 406  * since this is when the inode itself becomes flushable.
 407  */
 408 STATIC int
 409 xfs_fs_write_inode(
 410         struct inode            *inode,
 411         int                     sync)
 412 {
 413         bhv_vnode_t             *vp = vn_from_inode(inode);
 414         int                     error = 0, flags = FLUSH_INODE;
 415
 416         if (vp) {
 417                 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
 418                 if (sync)
 419                         flags |= FLUSH_SYNC;
 420                 error = bhv_vop_iflush(vp, flags);
 421                 if (error == EAGAIN)
 422                         error = sync? bhv_vop_iflush(vp, flags | FLUSH_LOG) : 0;
 423         }
 424         return -error;
 425 }
 426
 427 STATIC void
 428 xfs_fs_clear_inode(
 429         struct inode            *inode)
 430 {
 431         bhv_vnode_t             *vp = vn_from_inode(inode);
 432
 433         vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
 434
 435         XFS_STATS_INC(vn_rele);
 436         XFS_STATS_INC(vn_remove);
 437         XFS_STATS_INC(vn_reclaim);
 438         XFS_STATS_DEC(vn_active);
 439
 440         /*
 441          * This can happen because xfs_iget_core calls xfs_idestroy if we
 442          * find an inode with di_mode == 0 but without IGET_CREATE set.
 443          */
 444         if (VNHEAD(vp))
 445                 bhv_vop_inactive(vp, NULL);
 446
 447         VN_LOCK(vp);
 448         vp->v_flag &= ~VMODIFIED;
 449         VN_UNLOCK(vp, 0);
 450
 451         if (VNHEAD(vp))
 452                 if (bhv_vop_reclaim(vp))
 453                         panic("%s: cannot reclaim 0x%p\n", __FUNCTION__, vp);
 454
 455         ASSERT(VNHEAD(vp) == NULL);
 456
 457 #ifdef XFS_VNODE_TRACE
 458         ktrace_free(vp->v_trace);
 459 #endif
 460 }
 461
 462 /*
 463  * Enqueue a work item to be picked up by the vfs xfssyncd thread.
 464  * Doing this has two advantages:
 465  * - It saves on stack space, which is tight in certain situations
 466  * - It can be used (with care) as a mechanism to avoid deadlocks.
 467  * Flushing while allocating in a full filesystem requires both.
 468  */
 469 STATIC void
 470 xfs_syncd_queue_work(
 471         struct bhv_vfs  *vfs,
 472         void            *data,
 473         void            (*syncer)(bhv_vfs_t *, void *))
 474 {
 475         struct bhv_vfs_sync_work *work;
 476
 477         work = kmem_alloc(sizeof(struct bhv_vfs_sync_work), KM_SLEEP);
 478         INIT_LIST_HEAD(&work->w_list);
 479         work->w_syncer = syncer;
 480         work->w_data = data;
 481         work->w_vfs = vfs;
 482         spin_lock(&vfs->vfs_sync_lock);
 483         list_add_tail(&work->w_list, &vfs->vfs_sync_list);
 484         spin_unlock(&vfs->vfs_sync_lock);
 485         wake_up_process(vfs->vfs_sync_task);
 486 }
 487
 488 /*
 489  * Flush delayed allocate data, attempting to free up reserved space
 490  * from existing allocations.  At this point a new allocation attempt
 491  * has failed with ENOSPC and we are in the process of scratching our
 492  * heads, looking about for more room...
 493  */
 494 STATIC void
 495 xfs_flush_inode_work(
 496         bhv_vfs_t       *vfs,
 497         void            *inode)
 498 {
 499         filemap_flush(((struct inode *)inode)->i_mapping);
 500         iput((struct inode *)inode);
 501 }
 502
 503 void
 504 xfs_flush_inode(
 505         xfs_inode_t     *ip)
 506 {
 507         struct inode    *inode = vn_to_inode(XFS_ITOV(ip));
 508         struct bhv_vfs  *vfs = XFS_MTOVFS(ip->i_mount);
 509
 510         igrab(inode);
 511         xfs_syncd_queue_work(vfs, inode, xfs_flush_inode_work);
 512         delay(msecs_to_jiffies(500));
 513 }
 514
 515 /*
 516  * This is the "bigger hammer" version of xfs_flush_inode_work...
 517  * (IOW, "If at first you don't succeed, use a Bigger Hammer").
 518  */
 519 STATIC void
 520 xfs_flush_device_work(
 521         bhv_vfs_t       *vfs,
 522         void            *inode)
 523 {
 524         sync_blockdev(vfs->vfs_super->s_bdev);
 525         iput((struct inode *)inode);
 526 }
 527
 528 void
 529 xfs_flush_device(
 530         xfs_inode_t     *ip)
 531 {
 532         struct inode    *inode = vn_to_inode(XFS_ITOV(ip));
 533         struct bhv_vfs  *vfs = XFS_MTOVFS(ip->i_mount);
 534
 535         igrab(inode);
 536         xfs_syncd_queue_work(vfs, inode, xfs_flush_device_work);
 537         delay(msecs_to_jiffies(500));
 538         xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
 539 }
 540
 541 STATIC void
 542 vfs_sync_worker(
 543         bhv_vfs_t       *vfsp,
 544         void            *unused)
 545 {
 546         int             error;
 547
 548         if (!(vfsp->vfs_flag & VFS_RDONLY))
 549                 error = bhv_vfs_sync(vfsp, SYNC_FSDATA | SYNC_BDFLUSH | \
 550                                         SYNC_ATTR | SYNC_REFCACHE, NULL);
 551         vfsp->vfs_sync_seq++;
 552         wake_up(&vfsp->vfs_wait_single_sync_task);
 553 }
 554
 555 STATIC int
 556 xfssyncd(
 557         void                    *arg)
 558 {
 559         long                    timeleft;
 560         bhv_vfs_t               *vfsp = (bhv_vfs_t *) arg;
 561         bhv_vfs_sync_work_t     *work, *n;
 562         LIST_HEAD               (tmp);
 563
 564         timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10);
 565         for (;;) {
 566                 timeleft = schedule_timeout_interruptible(timeleft);
 567                 /* swsusp */
 568                 try_to_freeze();
 569                 if (kthread_should_stop() && list_empty(&vfsp->vfs_sync_list))
 570                         break;
 571
 572                 spin_lock(&vfsp->vfs_sync_lock);
 573                 /*
 574                  * We can get woken by laptop mode, to do a sync -
 575                  * that's the (only!) case where the list would be
 576                  * empty with time remaining.
 577                  */
 578                 if (!timeleft || list_empty(&vfsp->vfs_sync_list)) {
 579                         if (!timeleft)
 580                                 timeleft = xfs_syncd_centisecs *
 581                                                         msecs_to_jiffies(10);
 582                         INIT_LIST_HEAD(&vfsp->vfs_sync_work.w_list);
 583                         list_add_tail(&vfsp->vfs_sync_work.w_list,
 584                                         &vfsp->vfs_sync_list);
 585                 }
 586                 list_for_each_entry_safe(work, n, &vfsp->vfs_sync_list, w_list)
 587                         list_move(&work->w_list, &tmp);
 588                 spin_unlock(&vfsp->vfs_sync_lock);
 589
 590                 list_for_each_entry_safe(work, n, &tmp, w_list) {
 591                         (*work->w_syncer)(vfsp, work->w_data);
 592                         list_del(&work->w_list);
 593                         if (work == &vfsp->vfs_sync_work)
 594                                 continue;
 595                         kmem_free(work, sizeof(struct bhv_vfs_sync_work));
 596                 }
 597         }
 598
 599         return 0;
 600 }
 601
 602 STATIC int
 603 xfs_fs_start_syncd(
 604         bhv_vfs_t               *vfsp)
 605 {
 606         vfsp->vfs_sync_work.w_syncer = vfs_sync_worker;
 607         vfsp->vfs_sync_work.w_vfs = vfsp;
 608         vfsp->vfs_sync_task = kthread_run(xfssyncd, vfsp, "xfssyncd");
 609         if (IS_ERR(vfsp->vfs_sync_task))
 610                 return -PTR_ERR(vfsp->vfs_sync_task);
 611         return 0;
 612 }
 613
 614 STATIC void
 615 xfs_fs_stop_syncd(
 616         bhv_vfs_t               *vfsp)
 617 {
 618         kthread_stop(vfsp->vfs_sync_task);
 619 }
 620
 621 STATIC void
 622 xfs_fs_put_super(
 623         struct super_block      *sb)
 624 {
 625         bhv_vfs_t               *vfsp = vfs_from_sb(sb);
 626         int                     error;
 627
 628         xfs_fs_stop_syncd(vfsp);
 629         bhv_vfs_sync(vfsp, SYNC_ATTR | SYNC_DELWRI, NULL);
 630         error = bhv_vfs_unmount(vfsp, 0, NULL);
 631         if (error) {
 632                 printk("XFS: unmount got error=%d\n", error);
 633                 printk("%s: vfs=0x%p left dangling!\n", __FUNCTION__, vfsp);
 634         } else {
 635                 vfs_deallocate(vfsp);
 636         }
 637 }
 638
 639 STATIC void
 640 xfs_fs_write_super(
 641         struct super_block      *sb)
 642 {
 643         if (!(sb->s_flags & MS_RDONLY))
 644                 bhv_vfs_sync(vfs_from_sb(sb), SYNC_FSDATA, NULL);
 645         sb->s_dirt = 0;
 646 }
 647
 648 STATIC int
 649 xfs_fs_sync_super(
 650         struct super_block      *sb,
 651         int                     wait)
 652 {
 653         bhv_vfs_t               *vfsp = vfs_from_sb(sb);
 654         int                     error;
 655         int                     flags;
 656
 657         if (unlikely(sb->s_frozen == SB_FREEZE_WRITE)) {
 658                 /*
 659                  * First stage of freeze - no more writers will make progress
 660                  * now we are here, so we flush delwri and delalloc buffers
 661                  * here, then wait for all I/O to complete.  Data is frozen at
 662                  * that point. Metadata is not frozen, transactions can still
 663                  * occur here so don't bother flushing the buftarg (i.e
 664                  * SYNC_QUIESCE) because it'll just get dirty again.
 665                  */
 666                 flags = SYNC_FSDATA | SYNC_DELWRI | SYNC_WAIT | SYNC_IOWAIT;
 667         } else
 668                 flags = SYNC_FSDATA | (wait ? SYNC_WAIT : 0);
 669
 670         error = bhv_vfs_sync(vfsp, flags, NULL);
 671         sb->s_dirt = 0;
 672
 673         if (unlikely(laptop_mode)) {
 674                 int     prev_sync_seq = vfsp->vfs_sync_seq;
 675
 676                 /*
 677                  * The disk must be active because we're syncing.
 678                  * We schedule xfssyncd now (now that the disk is
 679                  * active) instead of later (when it might not be).
 680                  */
 681                 wake_up_process(vfsp->vfs_sync_task);
 682                 /*
 683                  * We have to wait for the sync iteration to complete.
 684                  * If we don't, the disk activity caused by the sync
 685                  * will come after the sync is completed, and that
 686                  * triggers another sync from laptop mode.
 687                  */
 688                 wait_event(vfsp->vfs_wait_single_sync_task,
 689                                 vfsp->vfs_sync_seq != prev_sync_seq);
 690         }
 691
 692         return -error;
 693 }
 694
 695 STATIC int
 696 xfs_fs_statfs(
 697         struct dentry           *dentry,
 698         struct kstatfs          *statp)
 699 {
 700         return -bhv_vfs_statvfs(vfs_from_sb(dentry->d_sb), statp,
 701                                 vn_from_inode(dentry->d_inode));
 702 }
 703
 704 STATIC int
 705 xfs_fs_remount(
 706         struct super_block      *sb,
 707         int                     *flags,
 708         char                    *options)
 709 {
 710         bhv_vfs_t               *vfsp = vfs_from_sb(sb);
 711         struct xfs_mount_args   *args = xfs_args_allocate(sb, 0);
 712         int                     error;
 713
 714         error = bhv_vfs_parseargs(vfsp, options, args, 1);
 715         if (!error)
 716                 error = bhv_vfs_mntupdate(vfsp, flags, args);
 717         kmem_free(args, sizeof(*args));
 718         return -error;
 719 }
 720
 721 STATIC void
 722 xfs_fs_lockfs(
 723         struct super_block      *sb)
 724 {
 725         bhv_vfs_freeze(vfs_from_sb(sb));
 726 }
 727
 728 STATIC int
 729 xfs_fs_show_options(
 730         struct seq_file         *m,
 731         struct vfsmount         *mnt)
 732 {
 733         return -bhv_vfs_showargs(vfs_from_sb(mnt->mnt_sb), m);
 734 }
 735
 736 STATIC int
 737 xfs_fs_quotasync(
 738         struct super_block      *sb,
 739         int                     type)
 740 {
 741         return -bhv_vfs_quotactl(vfs_from_sb(sb), Q_XQUOTASYNC, 0, NULL);
 742 }
 743
 744 STATIC int
 745 xfs_fs_getxstate(
 746         struct super_block      *sb,
 747         struct fs_quota_stat    *fqs)
 748 {
 749         return -bhv_vfs_quotactl(vfs_from_sb(sb), Q_XGETQSTAT, 0, (caddr_t)fqs);
 750 }
 751
 752 STATIC int
 753 xfs_fs_setxstate(
 754         struct super_block      *sb,
 755         unsigned int            flags,
 756         int                     op)
 757 {
 758         return -bhv_vfs_quotactl(vfs_from_sb(sb), op, 0, (caddr_t)&flags);
 759 }
 760
 761 STATIC int
 762 xfs_fs_getxquota(
 763         struct super_block      *sb,
 764         int                     type,
 765         qid_t                   id,
 766         struct fs_disk_quota    *fdq)
 767 {
 768         return -bhv_vfs_quotactl(vfs_from_sb(sb),
 769                                  (type == USRQUOTA) ? Q_XGETQUOTA :
 770                                   ((type == GRPQUOTA) ? Q_XGETGQUOTA :
 771                                    Q_XGETPQUOTA), id, (caddr_t)fdq);
 772 }
 773
 774 STATIC int
 775 xfs_fs_setxquota(
 776         struct super_block      *sb,
 777         int                     type,
 778         qid_t                   id,
 779         struct fs_disk_quota    *fdq)
 780 {
 781         return -bhv_vfs_quotactl(vfs_from_sb(sb),
 782                                  (type == USRQUOTA) ? Q_XSETQLIM :
 783                                   ((type == GRPQUOTA) ? Q_XSETGQLIM :
 784                                    Q_XSETPQLIM), id, (caddr_t)fdq);
 785 }
 786
 787 STATIC int
 788 xfs_fs_fill_super(
 789         struct super_block      *sb,
 790         void                    *data,
 791         int                     silent)
 792 {
 793         struct bhv_vnode        *rootvp;
 794         struct bhv_vfs          *vfsp = vfs_allocate(sb);
 795         struct xfs_mount_args   *args = xfs_args_allocate(sb, silent);
 796         struct kstatfs          statvfs;
 797         int                     error;
 798
 799         bhv_insert_all_vfsops(vfsp);
 800
 801         error = bhv_vfs_parseargs(vfsp, (char *)data, args, 0);
 802         if (error) {
 803                 bhv_remove_all_vfsops(vfsp, 1);
 804                 goto fail_vfsop;
 805         }
 806
 807         sb_min_blocksize(sb, BBSIZE);
 808         sb->s_export_op = &xfs_export_operations;
 809         sb->s_qcop = &xfs_quotactl_operations;
 810         sb->s_op = &xfs_super_operations;
 811
 812         error = bhv_vfs_mount(vfsp, args, NULL);
 813         if (error) {
 814                 bhv_remove_all_vfsops(vfsp, 1);
 815                 goto fail_vfsop;
 816         }
 817
 818         error = bhv_vfs_statvfs(vfsp, &statvfs, NULL);
 819         if (error)
 820                 goto fail_unmount;
 821
 822         sb->s_dirt = 1;
 823         sb->s_magic = statvfs.f_type;
 824         sb->s_blocksize = statvfs.f_bsize;
 825         sb->s_blocksize_bits = ffs(statvfs.f_bsize) - 1;
 826         sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
 827         sb->s_time_gran = 1;
 828         set_posix_acl_flag(sb);
 829
 830         error = bhv_vfs_root(vfsp, &rootvp);
 831         if (error)
 832                 goto fail_unmount;
 833
 834         sb->s_root = d_alloc_root(vn_to_inode(rootvp));
 835         if (!sb->s_root) {
 836                 error = ENOMEM;
 837                 goto fail_vnrele;
 838         }
 839         if (is_bad_inode(sb->s_root->d_inode)) {
 840                 error = EINVAL;
 841                 goto fail_vnrele;
 842         }
 843         if ((error = xfs_fs_start_syncd(vfsp)))
 844                 goto fail_vnrele;
 845         vn_trace_exit(rootvp, __FUNCTION__, (inst_t *)__return_address);
 846
 847         kmem_free(args, sizeof(*args));
 848         return 0;
 849
 850 fail_vnrele:
 851         if (sb->s_root) {
 852                 dput(sb->s_root);
 853                 sb->s_root = NULL;
 854         } else {
 855                 VN_RELE(rootvp);
 856         }
 857
 858 fail_unmount:
 859         bhv_vfs_unmount(vfsp, 0, NULL);
 860
 861 fail_vfsop:
 862         vfs_deallocate(vfsp);
 863         kmem_free(args, sizeof(*args));
 864         return -error;
 865 }
 866
 867 STATIC int
 868 xfs_fs_get_sb(
 869         struct file_system_type *fs_type,
 870         int                     flags,
 871         const char              *dev_name,
 872         void                    *data,
 873         struct vfsmount         *mnt)
 874 {
 875         return get_sb_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super,
 876                            mnt);
 877 }
 878
 879 static struct super_operations xfs_super_operations = {
 880         .alloc_inode            = xfs_fs_alloc_inode,
 881         .destroy_inode          = xfs_fs_destroy_inode,
 882         .write_inode            = xfs_fs_write_inode,
 883         .clear_inode            = xfs_fs_clear_inode,
 884         .put_super              = xfs_fs_put_super,
 885         .write_super            = xfs_fs_write_super,
 886         .sync_fs                = xfs_fs_sync_super,
 887         .write_super_lockfs     = xfs_fs_lockfs,
 888         .statfs                 = xfs_fs_statfs,
 889         .remount_fs             = xfs_fs_remount,
 890         .show_options           = xfs_fs_show_options,
 891 };
 892
 893 static struct quotactl_ops xfs_quotactl_operations = {
 894         .quota_sync             = xfs_fs_quotasync,
 895         .get_xstate             = xfs_fs_getxstate,
 896         .set_xstate             = xfs_fs_setxstate,
 897         .get_xquota             = xfs_fs_getxquota,
 898         .set_xquota             = xfs_fs_setxquota,
 899 };
 900
 901 static struct file_system_type xfs_fs_type = {
 902         .owner                  = THIS_MODULE,
 903         .name                   = "xfs",
 904         .get_sb                 = xfs_fs_get_sb,
 905         .kill_sb                = kill_block_super,
 906         .fs_flags               = FS_REQUIRES_DEV,
 907 };
 908
 909
 910 STATIC int __init
 911 init_xfs_fs( void )
 912 {
 913         int                     error;
 914         struct sysinfo          si;
 915         static char             message[] __initdata = KERN_INFO \
 916                 XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled\n";
 917
 918         printk(message);
 919
 920         si_meminfo(&si);
 921         xfs_physmem = si.totalram;
 922
 923         ktrace_init(64);
 924
 925         error = xfs_init_zones();
 926         if (error < 0)
 927                 goto undo_zones;
 928
 929         error = xfs_buf_init();
 930         if (error < 0)
 931                 goto undo_buffers;
 932
 933         vn_init();
 934         xfs_init();
 935         uuid_init();
 936         vfs_initquota();
 937
 938         error = register_filesystem(&xfs_fs_type);
 939         if (error)
 940                 goto undo_register;
 941         return 0;
 942
 943 undo_register:
 944         xfs_buf_terminate();
 945
 946 undo_buffers:
 947         xfs_destroy_zones();
 948
 949 undo_zones:
 950         return error;
 951 }
 952
 953 STATIC void __exit
 954 exit_xfs_fs( void )
 955 {
 956         vfs_exitquota();
 957         unregister_filesystem(&xfs_fs_type);
 958         xfs_cleanup();
 959         xfs_buf_terminate();
 960         xfs_destroy_zones();
 961         ktrace_uninit();
 962 }
 963
 964 module_init(init_xfs_fs);
 965 module_exit(exit_xfs_fs);
 966
 967 MODULE_AUTHOR("Silicon Graphics, Inc.");
 968 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
 969 MODULE_LICENSE("GPL");