linux/fs/xfs/xfs_inode_item.c
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   1/*
   2 * Copyright (c) 2000-2002,2005 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_fs.h"
  20#include "xfs_format.h"
  21#include "xfs_log_format.h"
  22#include "xfs_trans_resv.h"
  23#include "xfs_mount.h"
  24#include "xfs_inode.h"
  25#include "xfs_trans.h"
  26#include "xfs_inode_item.h"
  27#include "xfs_error.h"
  28#include "xfs_trace.h"
  29#include "xfs_trans_priv.h"
  30#include "xfs_log.h"
  31
  32
  33kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  34
  35static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
  36{
  37        return container_of(lip, struct xfs_inode_log_item, ili_item);
  38}
  39
  40STATIC void
  41xfs_inode_item_data_fork_size(
  42        struct xfs_inode_log_item *iip,
  43        int                     *nvecs,
  44        int                     *nbytes)
  45{
  46        struct xfs_inode        *ip = iip->ili_inode;
  47
  48        switch (ip->i_d.di_format) {
  49        case XFS_DINODE_FMT_EXTENTS:
  50                if ((iip->ili_fields & XFS_ILOG_DEXT) &&
  51                    ip->i_d.di_nextents > 0 &&
  52                    ip->i_df.if_bytes > 0) {
  53                        /* worst case, doesn't subtract delalloc extents */
  54                        *nbytes += XFS_IFORK_DSIZE(ip);
  55                        *nvecs += 1;
  56                }
  57                break;
  58        case XFS_DINODE_FMT_BTREE:
  59                if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
  60                    ip->i_df.if_broot_bytes > 0) {
  61                        *nbytes += ip->i_df.if_broot_bytes;
  62                        *nvecs += 1;
  63                }
  64                break;
  65        case XFS_DINODE_FMT_LOCAL:
  66                if ((iip->ili_fields & XFS_ILOG_DDATA) &&
  67                    ip->i_df.if_bytes > 0) {
  68                        *nbytes += roundup(ip->i_df.if_bytes, 4);
  69                        *nvecs += 1;
  70                }
  71                break;
  72
  73        case XFS_DINODE_FMT_DEV:
  74        case XFS_DINODE_FMT_UUID:
  75                break;
  76        default:
  77                ASSERT(0);
  78                break;
  79        }
  80}
  81
  82STATIC void
  83xfs_inode_item_attr_fork_size(
  84        struct xfs_inode_log_item *iip,
  85        int                     *nvecs,
  86        int                     *nbytes)
  87{
  88        struct xfs_inode        *ip = iip->ili_inode;
  89
  90        switch (ip->i_d.di_aformat) {
  91        case XFS_DINODE_FMT_EXTENTS:
  92                if ((iip->ili_fields & XFS_ILOG_AEXT) &&
  93                    ip->i_d.di_anextents > 0 &&
  94                    ip->i_afp->if_bytes > 0) {
  95                        /* worst case, doesn't subtract unused space */
  96                        *nbytes += XFS_IFORK_ASIZE(ip);
  97                        *nvecs += 1;
  98                }
  99                break;
 100        case XFS_DINODE_FMT_BTREE:
 101                if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 102                    ip->i_afp->if_broot_bytes > 0) {
 103                        *nbytes += ip->i_afp->if_broot_bytes;
 104                        *nvecs += 1;
 105                }
 106                break;
 107        case XFS_DINODE_FMT_LOCAL:
 108                if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 109                    ip->i_afp->if_bytes > 0) {
 110                        *nbytes += roundup(ip->i_afp->if_bytes, 4);
 111                        *nvecs += 1;
 112                }
 113                break;
 114        default:
 115                ASSERT(0);
 116                break;
 117        }
 118}
 119
 120/*
 121 * This returns the number of iovecs needed to log the given inode item.
 122 *
 123 * We need one iovec for the inode log format structure, one for the
 124 * inode core, and possibly one for the inode data/extents/b-tree root
 125 * and one for the inode attribute data/extents/b-tree root.
 126 */
 127STATIC void
 128xfs_inode_item_size(
 129        struct xfs_log_item     *lip,
 130        int                     *nvecs,
 131        int                     *nbytes)
 132{
 133        struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 134        struct xfs_inode        *ip = iip->ili_inode;
 135
 136        *nvecs += 2;
 137        *nbytes += sizeof(struct xfs_inode_log_format) +
 138                   xfs_log_dinode_size(ip->i_d.di_version);
 139
 140        xfs_inode_item_data_fork_size(iip, nvecs, nbytes);
 141        if (XFS_IFORK_Q(ip))
 142                xfs_inode_item_attr_fork_size(iip, nvecs, nbytes);
 143}
 144
 145STATIC void
 146xfs_inode_item_format_data_fork(
 147        struct xfs_inode_log_item *iip,
 148        struct xfs_inode_log_format *ilf,
 149        struct xfs_log_vec      *lv,
 150        struct xfs_log_iovec    **vecp)
 151{
 152        struct xfs_inode        *ip = iip->ili_inode;
 153        size_t                  data_bytes;
 154
 155        switch (ip->i_d.di_format) {
 156        case XFS_DINODE_FMT_EXTENTS:
 157                iip->ili_fields &=
 158                        ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 159                          XFS_ILOG_DEV | XFS_ILOG_UUID);
 160
 161                if ((iip->ili_fields & XFS_ILOG_DEXT) &&
 162                    ip->i_d.di_nextents > 0 &&
 163                    ip->i_df.if_bytes > 0) {
 164                        struct xfs_bmbt_rec *p;
 165
 166                        ASSERT(ip->i_df.if_u1.if_extents != NULL);
 167                        ASSERT(ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) > 0);
 168
 169                        p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IEXT);
 170                        data_bytes = xfs_iextents_copy(ip, p, XFS_DATA_FORK);
 171                        xlog_finish_iovec(lv, *vecp, data_bytes);
 172
 173                        ASSERT(data_bytes <= ip->i_df.if_bytes);
 174
 175                        ilf->ilf_dsize = data_bytes;
 176                        ilf->ilf_size++;
 177                } else {
 178                        iip->ili_fields &= ~XFS_ILOG_DEXT;
 179                }
 180                break;
 181        case XFS_DINODE_FMT_BTREE:
 182                iip->ili_fields &=
 183                        ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 184                          XFS_ILOG_DEV | XFS_ILOG_UUID);
 185
 186                if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
 187                    ip->i_df.if_broot_bytes > 0) {
 188                        ASSERT(ip->i_df.if_broot != NULL);
 189                        xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IBROOT,
 190                                        ip->i_df.if_broot,
 191                                        ip->i_df.if_broot_bytes);
 192                        ilf->ilf_dsize = ip->i_df.if_broot_bytes;
 193                        ilf->ilf_size++;
 194                } else {
 195                        ASSERT(!(iip->ili_fields &
 196                                 XFS_ILOG_DBROOT));
 197                        iip->ili_fields &= ~XFS_ILOG_DBROOT;
 198                }
 199                break;
 200        case XFS_DINODE_FMT_LOCAL:
 201                iip->ili_fields &=
 202                        ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 203                          XFS_ILOG_DEV | XFS_ILOG_UUID);
 204                if ((iip->ili_fields & XFS_ILOG_DDATA) &&
 205                    ip->i_df.if_bytes > 0) {
 206                        /*
 207                         * Round i_bytes up to a word boundary.
 208                         * The underlying memory is guaranteed to
 209                         * to be there by xfs_idata_realloc().
 210                         */
 211                        data_bytes = roundup(ip->i_df.if_bytes, 4);
 212                        ASSERT(ip->i_df.if_real_bytes == 0 ||
 213                               ip->i_df.if_real_bytes == data_bytes);
 214                        ASSERT(ip->i_df.if_u1.if_data != NULL);
 215                        ASSERT(ip->i_d.di_size > 0);
 216                        xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_ILOCAL,
 217                                        ip->i_df.if_u1.if_data, data_bytes);
 218                        ilf->ilf_dsize = (unsigned)data_bytes;
 219                        ilf->ilf_size++;
 220                } else {
 221                        iip->ili_fields &= ~XFS_ILOG_DDATA;
 222                }
 223                break;
 224        case XFS_DINODE_FMT_DEV:
 225                iip->ili_fields &=
 226                        ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 227                          XFS_ILOG_DEXT | XFS_ILOG_UUID);
 228                if (iip->ili_fields & XFS_ILOG_DEV)
 229                        ilf->ilf_u.ilfu_rdev = ip->i_df.if_u2.if_rdev;
 230                break;
 231        case XFS_DINODE_FMT_UUID:
 232                iip->ili_fields &=
 233                        ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 234                          XFS_ILOG_DEXT | XFS_ILOG_DEV);
 235                if (iip->ili_fields & XFS_ILOG_UUID)
 236                        ilf->ilf_u.ilfu_uuid = ip->i_df.if_u2.if_uuid;
 237                break;
 238        default:
 239                ASSERT(0);
 240                break;
 241        }
 242}
 243
 244STATIC void
 245xfs_inode_item_format_attr_fork(
 246        struct xfs_inode_log_item *iip,
 247        struct xfs_inode_log_format *ilf,
 248        struct xfs_log_vec      *lv,
 249        struct xfs_log_iovec    **vecp)
 250{
 251        struct xfs_inode        *ip = iip->ili_inode;
 252        size_t                  data_bytes;
 253
 254        switch (ip->i_d.di_aformat) {
 255        case XFS_DINODE_FMT_EXTENTS:
 256                iip->ili_fields &=
 257                        ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 258
 259                if ((iip->ili_fields & XFS_ILOG_AEXT) &&
 260                    ip->i_d.di_anextents > 0 &&
 261                    ip->i_afp->if_bytes > 0) {
 262                        struct xfs_bmbt_rec *p;
 263
 264                        ASSERT(ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) ==
 265                                ip->i_d.di_anextents);
 266                        ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 267
 268                        p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_EXT);
 269                        data_bytes = xfs_iextents_copy(ip, p, XFS_ATTR_FORK);
 270                        xlog_finish_iovec(lv, *vecp, data_bytes);
 271
 272                        ilf->ilf_asize = data_bytes;
 273                        ilf->ilf_size++;
 274                } else {
 275                        iip->ili_fields &= ~XFS_ILOG_AEXT;
 276                }
 277                break;
 278        case XFS_DINODE_FMT_BTREE:
 279                iip->ili_fields &=
 280                        ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 281
 282                if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 283                    ip->i_afp->if_broot_bytes > 0) {
 284                        ASSERT(ip->i_afp->if_broot != NULL);
 285
 286                        xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_BROOT,
 287                                        ip->i_afp->if_broot,
 288                                        ip->i_afp->if_broot_bytes);
 289                        ilf->ilf_asize = ip->i_afp->if_broot_bytes;
 290                        ilf->ilf_size++;
 291                } else {
 292                        iip->ili_fields &= ~XFS_ILOG_ABROOT;
 293                }
 294                break;
 295        case XFS_DINODE_FMT_LOCAL:
 296                iip->ili_fields &=
 297                        ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 298
 299                if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 300                    ip->i_afp->if_bytes > 0) {
 301                        /*
 302                         * Round i_bytes up to a word boundary.
 303                         * The underlying memory is guaranteed to
 304                         * to be there by xfs_idata_realloc().
 305                         */
 306                        data_bytes = roundup(ip->i_afp->if_bytes, 4);
 307                        ASSERT(ip->i_afp->if_real_bytes == 0 ||
 308                               ip->i_afp->if_real_bytes == data_bytes);
 309                        ASSERT(ip->i_afp->if_u1.if_data != NULL);
 310                        xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_LOCAL,
 311                                        ip->i_afp->if_u1.if_data,
 312                                        data_bytes);
 313                        ilf->ilf_asize = (unsigned)data_bytes;
 314                        ilf->ilf_size++;
 315                } else {
 316                        iip->ili_fields &= ~XFS_ILOG_ADATA;
 317                }
 318                break;
 319        default:
 320                ASSERT(0);
 321                break;
 322        }
 323}
 324
 325static void
 326xfs_inode_to_log_dinode(
 327        struct xfs_inode        *ip,
 328        struct xfs_log_dinode   *to,
 329        xfs_lsn_t               lsn)
 330{
 331        struct xfs_icdinode     *from = &ip->i_d;
 332        struct inode            *inode = VFS_I(ip);
 333
 334        to->di_magic = XFS_DINODE_MAGIC;
 335
 336        to->di_version = from->di_version;
 337        to->di_format = from->di_format;
 338        to->di_uid = from->di_uid;
 339        to->di_gid = from->di_gid;
 340        to->di_projid_lo = from->di_projid_lo;
 341        to->di_projid_hi = from->di_projid_hi;
 342
 343        memset(to->di_pad, 0, sizeof(to->di_pad));
 344        memset(to->di_pad3, 0, sizeof(to->di_pad3));
 345        to->di_atime.t_sec = inode->i_atime.tv_sec;
 346        to->di_atime.t_nsec = inode->i_atime.tv_nsec;
 347        to->di_mtime.t_sec = inode->i_mtime.tv_sec;
 348        to->di_mtime.t_nsec = inode->i_mtime.tv_nsec;
 349        to->di_ctime.t_sec = inode->i_ctime.tv_sec;
 350        to->di_ctime.t_nsec = inode->i_ctime.tv_nsec;
 351        to->di_nlink = inode->i_nlink;
 352        to->di_gen = inode->i_generation;
 353        to->di_mode = inode->i_mode;
 354
 355        to->di_size = from->di_size;
 356        to->di_nblocks = from->di_nblocks;
 357        to->di_extsize = from->di_extsize;
 358        to->di_nextents = from->di_nextents;
 359        to->di_anextents = from->di_anextents;
 360        to->di_forkoff = from->di_forkoff;
 361        to->di_aformat = from->di_aformat;
 362        to->di_dmevmask = from->di_dmevmask;
 363        to->di_dmstate = from->di_dmstate;
 364        to->di_flags = from->di_flags;
 365
 366        if (from->di_version == 3) {
 367                to->di_changecount = inode->i_version;
 368                to->di_crtime.t_sec = from->di_crtime.t_sec;
 369                to->di_crtime.t_nsec = from->di_crtime.t_nsec;
 370                to->di_flags2 = from->di_flags2;
 371
 372                to->di_ino = ip->i_ino;
 373                to->di_lsn = lsn;
 374                memset(to->di_pad2, 0, sizeof(to->di_pad2));
 375                uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
 376                to->di_flushiter = 0;
 377        } else {
 378                to->di_flushiter = from->di_flushiter;
 379        }
 380}
 381
 382/*
 383 * Format the inode core. Current timestamp data is only in the VFS inode
 384 * fields, so we need to grab them from there. Hence rather than just copying
 385 * the XFS inode core structure, format the fields directly into the iovec.
 386 */
 387static void
 388xfs_inode_item_format_core(
 389        struct xfs_inode        *ip,
 390        struct xfs_log_vec      *lv,
 391        struct xfs_log_iovec    **vecp)
 392{
 393        struct xfs_log_dinode   *dic;
 394
 395        dic = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_ICORE);
 396        xfs_inode_to_log_dinode(ip, dic, ip->i_itemp->ili_item.li_lsn);
 397        xlog_finish_iovec(lv, *vecp, xfs_log_dinode_size(ip->i_d.di_version));
 398}
 399
 400/*
 401 * This is called to fill in the vector of log iovecs for the given inode
 402 * log item.  It fills the first item with an inode log format structure,
 403 * the second with the on-disk inode structure, and a possible third and/or
 404 * fourth with the inode data/extents/b-tree root and inode attributes
 405 * data/extents/b-tree root.
 406 */
 407STATIC void
 408xfs_inode_item_format(
 409        struct xfs_log_item     *lip,
 410        struct xfs_log_vec      *lv)
 411{
 412        struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 413        struct xfs_inode        *ip = iip->ili_inode;
 414        struct xfs_inode_log_format *ilf;
 415        struct xfs_log_iovec    *vecp = NULL;
 416
 417        ASSERT(ip->i_d.di_version > 1);
 418
 419        ilf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_IFORMAT);
 420        ilf->ilf_type = XFS_LI_INODE;
 421        ilf->ilf_ino = ip->i_ino;
 422        ilf->ilf_blkno = ip->i_imap.im_blkno;
 423        ilf->ilf_len = ip->i_imap.im_len;
 424        ilf->ilf_boffset = ip->i_imap.im_boffset;
 425        ilf->ilf_fields = XFS_ILOG_CORE;
 426        ilf->ilf_size = 2; /* format + core */
 427        xlog_finish_iovec(lv, vecp, sizeof(struct xfs_inode_log_format));
 428
 429        xfs_inode_item_format_core(ip, lv, &vecp);
 430        xfs_inode_item_format_data_fork(iip, ilf, lv, &vecp);
 431        if (XFS_IFORK_Q(ip)) {
 432                xfs_inode_item_format_attr_fork(iip, ilf, lv, &vecp);
 433        } else {
 434                iip->ili_fields &=
 435                        ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 436        }
 437
 438        /* update the format with the exact fields we actually logged */
 439        ilf->ilf_fields |= (iip->ili_fields & ~XFS_ILOG_TIMESTAMP);
 440}
 441
 442/*
 443 * This is called to pin the inode associated with the inode log
 444 * item in memory so it cannot be written out.
 445 */
 446STATIC void
 447xfs_inode_item_pin(
 448        struct xfs_log_item     *lip)
 449{
 450        struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 451
 452        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 453
 454        trace_xfs_inode_pin(ip, _RET_IP_);
 455        atomic_inc(&ip->i_pincount);
 456}
 457
 458
 459/*
 460 * This is called to unpin the inode associated with the inode log
 461 * item which was previously pinned with a call to xfs_inode_item_pin().
 462 *
 463 * Also wake up anyone in xfs_iunpin_wait() if the count goes to 0.
 464 */
 465STATIC void
 466xfs_inode_item_unpin(
 467        struct xfs_log_item     *lip,
 468        int                     remove)
 469{
 470        struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 471
 472        trace_xfs_inode_unpin(ip, _RET_IP_);
 473        ASSERT(atomic_read(&ip->i_pincount) > 0);
 474        if (atomic_dec_and_test(&ip->i_pincount))
 475                wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
 476}
 477
 478STATIC uint
 479xfs_inode_item_push(
 480        struct xfs_log_item     *lip,
 481        struct list_head        *buffer_list)
 482                __releases(&lip->li_ailp->xa_lock)
 483                __acquires(&lip->li_ailp->xa_lock)
 484{
 485        struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 486        struct xfs_inode        *ip = iip->ili_inode;
 487        struct xfs_buf          *bp = NULL;
 488        uint                    rval = XFS_ITEM_SUCCESS;
 489        int                     error;
 490
 491        if (xfs_ipincount(ip) > 0)
 492                return XFS_ITEM_PINNED;
 493
 494        if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
 495                return XFS_ITEM_LOCKED;
 496
 497        /*
 498         * Re-check the pincount now that we stabilized the value by
 499         * taking the ilock.
 500         */
 501        if (xfs_ipincount(ip) > 0) {
 502                rval = XFS_ITEM_PINNED;
 503                goto out_unlock;
 504        }
 505
 506        /*
 507         * Stale inode items should force out the iclog.
 508         */
 509        if (ip->i_flags & XFS_ISTALE) {
 510                rval = XFS_ITEM_PINNED;
 511                goto out_unlock;
 512        }
 513
 514        /*
 515         * Someone else is already flushing the inode.  Nothing we can do
 516         * here but wait for the flush to finish and remove the item from
 517         * the AIL.
 518         */
 519        if (!xfs_iflock_nowait(ip)) {
 520                rval = XFS_ITEM_FLUSHING;
 521                goto out_unlock;
 522        }
 523
 524        ASSERT(iip->ili_fields != 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 525        ASSERT(iip->ili_logged == 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 526
 527        spin_unlock(&lip->li_ailp->xa_lock);
 528
 529        error = xfs_iflush(ip, &bp);
 530        if (!error) {
 531                if (!xfs_buf_delwri_queue(bp, buffer_list))
 532                        rval = XFS_ITEM_FLUSHING;
 533                xfs_buf_relse(bp);
 534        }
 535
 536        spin_lock(&lip->li_ailp->xa_lock);
 537out_unlock:
 538        xfs_iunlock(ip, XFS_ILOCK_SHARED);
 539        return rval;
 540}
 541
 542/*
 543 * Unlock the inode associated with the inode log item.
 544 * Clear the fields of the inode and inode log item that
 545 * are specific to the current transaction.  If the
 546 * hold flags is set, do not unlock the inode.
 547 */
 548STATIC void
 549xfs_inode_item_unlock(
 550        struct xfs_log_item     *lip)
 551{
 552        struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 553        struct xfs_inode        *ip = iip->ili_inode;
 554        unsigned short          lock_flags;
 555
 556        ASSERT(ip->i_itemp != NULL);
 557        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 558
 559        lock_flags = iip->ili_lock_flags;
 560        iip->ili_lock_flags = 0;
 561        if (lock_flags)
 562                xfs_iunlock(ip, lock_flags);
 563}
 564
 565/*
 566 * This is called to find out where the oldest active copy of the inode log
 567 * item in the on disk log resides now that the last log write of it completed
 568 * at the given lsn.  Since we always re-log all dirty data in an inode, the
 569 * latest copy in the on disk log is the only one that matters.  Therefore,
 570 * simply return the given lsn.
 571 *
 572 * If the inode has been marked stale because the cluster is being freed, we
 573 * don't want to (re-)insert this inode into the AIL. There is a race condition
 574 * where the cluster buffer may be unpinned before the inode is inserted into
 575 * the AIL during transaction committed processing. If the buffer is unpinned
 576 * before the inode item has been committed and inserted, then it is possible
 577 * for the buffer to be written and IO completes before the inode is inserted
 578 * into the AIL. In that case, we'd be inserting a clean, stale inode into the
 579 * AIL which will never get removed. It will, however, get reclaimed which
 580 * triggers an assert in xfs_inode_free() complaining about freein an inode
 581 * still in the AIL.
 582 *
 583 * To avoid this, just unpin the inode directly and return a LSN of -1 so the
 584 * transaction committed code knows that it does not need to do any further
 585 * processing on the item.
 586 */
 587STATIC xfs_lsn_t
 588xfs_inode_item_committed(
 589        struct xfs_log_item     *lip,
 590        xfs_lsn_t               lsn)
 591{
 592        struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 593        struct xfs_inode        *ip = iip->ili_inode;
 594
 595        if (xfs_iflags_test(ip, XFS_ISTALE)) {
 596                xfs_inode_item_unpin(lip, 0);
 597                return -1;
 598        }
 599        return lsn;
 600}
 601
 602/*
 603 * XXX rcc - this one really has to do something.  Probably needs
 604 * to stamp in a new field in the incore inode.
 605 */
 606STATIC void
 607xfs_inode_item_committing(
 608        struct xfs_log_item     *lip,
 609        xfs_lsn_t               lsn)
 610{
 611        INODE_ITEM(lip)->ili_last_lsn = lsn;
 612}
 613
 614/*
 615 * This is the ops vector shared by all buf log items.
 616 */
 617static const struct xfs_item_ops xfs_inode_item_ops = {
 618        .iop_size       = xfs_inode_item_size,
 619        .iop_format     = xfs_inode_item_format,
 620        .iop_pin        = xfs_inode_item_pin,
 621        .iop_unpin      = xfs_inode_item_unpin,
 622        .iop_unlock     = xfs_inode_item_unlock,
 623        .iop_committed  = xfs_inode_item_committed,
 624        .iop_push       = xfs_inode_item_push,
 625        .iop_committing = xfs_inode_item_committing
 626};
 627
 628
 629/*
 630 * Initialize the inode log item for a newly allocated (in-core) inode.
 631 */
 632void
 633xfs_inode_item_init(
 634        struct xfs_inode        *ip,
 635        struct xfs_mount        *mp)
 636{
 637        struct xfs_inode_log_item *iip;
 638
 639        ASSERT(ip->i_itemp == NULL);
 640        iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 641
 642        iip->ili_inode = ip;
 643        xfs_log_item_init(mp, &iip->ili_item, XFS_LI_INODE,
 644                                                &xfs_inode_item_ops);
 645}
 646
 647/*
 648 * Free the inode log item and any memory hanging off of it.
 649 */
 650void
 651xfs_inode_item_destroy(
 652        xfs_inode_t     *ip)
 653{
 654        kmem_free(ip->i_itemp->ili_item.li_lv_shadow);
 655        kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 656}
 657
 658
 659/*
 660 * This is the inode flushing I/O completion routine.  It is called
 661 * from interrupt level when the buffer containing the inode is
 662 * flushed to disk.  It is responsible for removing the inode item
 663 * from the AIL if it has not been re-logged, and unlocking the inode's
 664 * flush lock.
 665 *
 666 * To reduce AIL lock traffic as much as possible, we scan the buffer log item
 667 * list for other inodes that will run this function. We remove them from the
 668 * buffer list so we can process all the inode IO completions in one AIL lock
 669 * traversal.
 670 */
 671void
 672xfs_iflush_done(
 673        struct xfs_buf          *bp,
 674        struct xfs_log_item     *lip)
 675{
 676        struct xfs_inode_log_item *iip;
 677        struct xfs_log_item     *blip;
 678        struct xfs_log_item     *next;
 679        struct xfs_log_item     *prev;
 680        struct xfs_ail          *ailp = lip->li_ailp;
 681        int                     need_ail = 0;
 682
 683        /*
 684         * Scan the buffer IO completions for other inodes being completed and
 685         * attach them to the current inode log item.
 686         */
 687        blip = bp->b_fspriv;
 688        prev = NULL;
 689        while (blip != NULL) {
 690                if (blip->li_cb != xfs_iflush_done) {
 691                        prev = blip;
 692                        blip = blip->li_bio_list;
 693                        continue;
 694                }
 695
 696                /* remove from list */
 697                next = blip->li_bio_list;
 698                if (!prev) {
 699                        bp->b_fspriv = next;
 700                } else {
 701                        prev->li_bio_list = next;
 702                }
 703
 704                /* add to current list */
 705                blip->li_bio_list = lip->li_bio_list;
 706                lip->li_bio_list = blip;
 707
 708                /*
 709                 * while we have the item, do the unlocked check for needing
 710                 * the AIL lock.
 711                 */
 712                iip = INODE_ITEM(blip);
 713                if (iip->ili_logged && blip->li_lsn == iip->ili_flush_lsn)
 714                        need_ail++;
 715
 716                blip = next;
 717        }
 718
 719        /* make sure we capture the state of the initial inode. */
 720        iip = INODE_ITEM(lip);
 721        if (iip->ili_logged && lip->li_lsn == iip->ili_flush_lsn)
 722                need_ail++;
 723
 724        /*
 725         * We only want to pull the item from the AIL if it is
 726         * actually there and its location in the log has not
 727         * changed since we started the flush.  Thus, we only bother
 728         * if the ili_logged flag is set and the inode's lsn has not
 729         * changed.  First we check the lsn outside
 730         * the lock since it's cheaper, and then we recheck while
 731         * holding the lock before removing the inode from the AIL.
 732         */
 733        if (need_ail) {
 734                struct xfs_log_item *log_items[need_ail];
 735                int i = 0;
 736                spin_lock(&ailp->xa_lock);
 737                for (blip = lip; blip; blip = blip->li_bio_list) {
 738                        iip = INODE_ITEM(blip);
 739                        if (iip->ili_logged &&
 740                            blip->li_lsn == iip->ili_flush_lsn) {
 741                                log_items[i++] = blip;
 742                        }
 743                        ASSERT(i <= need_ail);
 744                }
 745                /* xfs_trans_ail_delete_bulk() drops the AIL lock. */
 746                xfs_trans_ail_delete_bulk(ailp, log_items, i,
 747                                          SHUTDOWN_CORRUPT_INCORE);
 748        }
 749
 750
 751        /*
 752         * clean up and unlock the flush lock now we are done. We can clear the
 753         * ili_last_fields bits now that we know that the data corresponding to
 754         * them is safely on disk.
 755         */
 756        for (blip = lip; blip; blip = next) {
 757                next = blip->li_bio_list;
 758                blip->li_bio_list = NULL;
 759
 760                iip = INODE_ITEM(blip);
 761                iip->ili_logged = 0;
 762                iip->ili_last_fields = 0;
 763                xfs_ifunlock(iip->ili_inode);
 764        }
 765}
 766
 767/*
 768 * This is the inode flushing abort routine.  It is called from xfs_iflush when
 769 * the filesystem is shutting down to clean up the inode state.  It is
 770 * responsible for removing the inode item from the AIL if it has not been
 771 * re-logged, and unlocking the inode's flush lock.
 772 */
 773void
 774xfs_iflush_abort(
 775        xfs_inode_t             *ip,
 776        bool                    stale)
 777{
 778        xfs_inode_log_item_t    *iip = ip->i_itemp;
 779
 780        if (iip) {
 781                if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 782                        xfs_trans_ail_remove(&iip->ili_item,
 783                                             stale ? SHUTDOWN_LOG_IO_ERROR :
 784                                                     SHUTDOWN_CORRUPT_INCORE);
 785                }
 786                iip->ili_logged = 0;
 787                /*
 788                 * Clear the ili_last_fields bits now that we know that the
 789                 * data corresponding to them is safely on disk.
 790                 */
 791                iip->ili_last_fields = 0;
 792                /*
 793                 * Clear the inode logging fields so no more flushes are
 794                 * attempted.
 795                 */
 796                iip->ili_fields = 0;
 797                iip->ili_fsync_fields = 0;
 798        }
 799        /*
 800         * Release the inode's flush lock since we're done with it.
 801         */
 802        xfs_ifunlock(ip);
 803}
 804
 805void
 806xfs_istale_done(
 807        struct xfs_buf          *bp,
 808        struct xfs_log_item     *lip)
 809{
 810        xfs_iflush_abort(INODE_ITEM(lip)->ili_inode, true);
 811}
 812
 813/*
 814 * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
 815 * (which can have different field alignments) to the native version
 816 */
 817int
 818xfs_inode_item_format_convert(
 819        xfs_log_iovec_t         *buf,
 820        xfs_inode_log_format_t  *in_f)
 821{
 822        if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
 823                xfs_inode_log_format_32_t *in_f32 = buf->i_addr;
 824
 825                in_f->ilf_type = in_f32->ilf_type;
 826                in_f->ilf_size = in_f32->ilf_size;
 827                in_f->ilf_fields = in_f32->ilf_fields;
 828                in_f->ilf_asize = in_f32->ilf_asize;
 829                in_f->ilf_dsize = in_f32->ilf_dsize;
 830                in_f->ilf_ino = in_f32->ilf_ino;
 831                /* copy biggest field of ilf_u */
 832                memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 833                       in_f32->ilf_u.ilfu_uuid.__u_bits,
 834                       sizeof(uuid_t));
 835                in_f->ilf_blkno = in_f32->ilf_blkno;
 836                in_f->ilf_len = in_f32->ilf_len;
 837                in_f->ilf_boffset = in_f32->ilf_boffset;
 838                return 0;
 839        } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
 840                xfs_inode_log_format_64_t *in_f64 = buf->i_addr;
 841
 842                in_f->ilf_type = in_f64->ilf_type;
 843                in_f->ilf_size = in_f64->ilf_size;
 844                in_f->ilf_fields = in_f64->ilf_fields;
 845                in_f->ilf_asize = in_f64->ilf_asize;
 846                in_f->ilf_dsize = in_f64->ilf_dsize;
 847                in_f->ilf_ino = in_f64->ilf_ino;
 848                /* copy biggest field of ilf_u */
 849                memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 850                       in_f64->ilf_u.ilfu_uuid.__u_bits,
 851                       sizeof(uuid_t));
 852                in_f->ilf_blkno = in_f64->ilf_blkno;
 853                in_f->ilf_len = in_f64->ilf_len;
 854                in_f->ilf_boffset = in_f64->ilf_boffset;
 855                return 0;
 856        }
 857        return -EFSCORRUPTED;
 858}
 859