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xfs_inode_item.c

/*
 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_trans_priv.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rw.h"


kmem_zone_t *xfs_ili_zone;          /* inode log item zone */

/*
 * This returns the number of iovecs needed to log the given inode item.
 *
 * We need one iovec for the inode log format structure, one for the
 * inode core, and possibly one for the inode data/extents/b-tree root
 * and one for the inode attribute data/extents/b-tree root.
 */
STATIC uint
xfs_inode_item_size(
      xfs_inode_log_item_t    *iip)
{
      uint        nvecs;
      xfs_inode_t *ip;

      ip = iip->ili_inode;
      nvecs = 2;

      /*
       * Only log the data/extents/b-tree root if there is something
       * left to log.
       */
      iip->ili_format.ilf_fields |= XFS_ILOG_CORE;

      switch (ip->i_d.di_format) {
      case XFS_DINODE_FMT_EXTENTS:
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
                    XFS_ILOG_DEV | XFS_ILOG_UUID);
            if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
                (ip->i_d.di_nextents > 0) &&
                (ip->i_df.if_bytes > 0)) {
                  ASSERT(ip->i_df.if_u1.if_extents != NULL);
                  nvecs++;
            } else {
                  iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
            }
            break;

      case XFS_DINODE_FMT_BTREE:
            ASSERT(ip->i_df.if_ext_max ==
                   XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
                    XFS_ILOG_DEV | XFS_ILOG_UUID);
            if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
                (ip->i_df.if_broot_bytes > 0)) {
                  ASSERT(ip->i_df.if_broot != NULL);
                  nvecs++;
            } else {
                  ASSERT(!(iip->ili_format.ilf_fields &
                         XFS_ILOG_DBROOT));
#ifdef XFS_TRANS_DEBUG
                  if (iip->ili_root_size > 0) {
                        ASSERT(iip->ili_root_size ==
                               ip->i_df.if_broot_bytes);
                        ASSERT(memcmp(iip->ili_orig_root,
                                  ip->i_df.if_broot,
                                  iip->ili_root_size) == 0);
                  } else {
                        ASSERT(ip->i_df.if_broot_bytes == 0);
                  }
#endif
                  iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
            }
            break;

      case XFS_DINODE_FMT_LOCAL:
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
                    XFS_ILOG_DEV | XFS_ILOG_UUID);
            if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
                (ip->i_df.if_bytes > 0)) {
                  ASSERT(ip->i_df.if_u1.if_data != NULL);
                  ASSERT(ip->i_d.di_size > 0);
                  nvecs++;
            } else {
                  iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
            }
            break;

      case XFS_DINODE_FMT_DEV:
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
                    XFS_ILOG_DEXT | XFS_ILOG_UUID);
            break;

      case XFS_DINODE_FMT_UUID:
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
                    XFS_ILOG_DEXT | XFS_ILOG_DEV);
            break;

      default:
            ASSERT(0);
            break;
      }

      /*
       * If there are no attributes associated with this file,
       * then there cannot be anything more to log.
       * Clear all attribute-related log flags.
       */
      if (!XFS_IFORK_Q(ip)) {
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
            return nvecs;
      }

      /*
       * Log any necessary attribute data.
       */
      switch (ip->i_d.di_aformat) {
      case XFS_DINODE_FMT_EXTENTS:
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
            if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
                (ip->i_d.di_anextents > 0) &&
                (ip->i_afp->if_bytes > 0)) {
                  ASSERT(ip->i_afp->if_u1.if_extents != NULL);
                  nvecs++;
            } else {
                  iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
            }
            break;

      case XFS_DINODE_FMT_BTREE:
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
            if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
                (ip->i_afp->if_broot_bytes > 0)) {
                  ASSERT(ip->i_afp->if_broot != NULL);
                  nvecs++;
            } else {
                  iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
            }
            break;

      case XFS_DINODE_FMT_LOCAL:
            iip->ili_format.ilf_fields &=
                  ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
            if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
                (ip->i_afp->if_bytes > 0)) {
                  ASSERT(ip->i_afp->if_u1.if_data != NULL);
                  nvecs++;
            } else {
                  iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
            }
            break;

      default:
            ASSERT(0);
            break;
      }

      return nvecs;
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given inode log item.  It fills the first item with an inode
 * log format structure, the second with the on-disk inode structure,
 * and a possible third and/or fourth with the inode data/extents/b-tree
 * root and inode attributes data/extents/b-tree root.
 */
STATIC void
xfs_inode_item_format(
      xfs_inode_log_item_t    *iip,
      xfs_log_iovec_t         *log_vector)
{
      uint              nvecs;
      xfs_log_iovec_t         *vecp;
      xfs_inode_t       *ip;
      size_t                  data_bytes;
      xfs_bmbt_rec_t          *ext_buffer;
      int               nrecs;
      xfs_mount_t       *mp;

      ip = iip->ili_inode;
      vecp = log_vector;

      vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
      vecp->i_len  = sizeof(xfs_inode_log_format_t);
      XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
      vecp++;
      nvecs      = 1;

      /*
       * Clear i_update_core if the timestamps (or any other
       * non-transactional modification) need flushing/logging
       * and we're about to log them with the rest of the core.
       *
       * This is the same logic as xfs_iflush() but this code can't
       * run at the same time as xfs_iflush because we're in commit
       * processing here and so we have the inode lock held in
       * exclusive mode.  Although it doesn't really matter
       * for the timestamps if both routines were to grab the
       * timestamps or not.  That would be ok.
       *
       * We clear i_update_core before copying out the data.
       * This is for coordination with our timestamp updates
       * that don't hold the inode lock. They will always
       * update the timestamps BEFORE setting i_update_core,
       * so if we clear i_update_core after they set it we
       * are guaranteed to see their updates to the timestamps
       * either here.  Likewise, if they set it after we clear it
       * here, we'll see it either on the next commit of this
       * inode or the next time the inode gets flushed via
       * xfs_iflush().  This depends on strongly ordered memory
       * semantics, but we have that.  We use the SYNCHRONIZE
       * macro to make sure that the compiler does not reorder
       * the i_update_core access below the data copy below.
       */
      if (ip->i_update_core)  {
            ip->i_update_core = 0;
            SYNCHRONIZE();
      }

      /*
       * We don't have to worry about re-ordering here because
       * the update_size field is protected by the inode lock
       * and we have that held in exclusive mode.
       */
      if (ip->i_update_size)
            ip->i_update_size = 0;

      /*
       * Make sure to get the latest atime from the Linux inode.
       */
      xfs_synchronize_atime(ip);

      vecp->i_addr = (xfs_caddr_t)&ip->i_d;
      vecp->i_len  = sizeof(xfs_dinode_core_t);
      XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
      vecp++;
      nvecs++;
      iip->ili_format.ilf_fields |= XFS_ILOG_CORE;

      /*
       * If this is really an old format inode, then we need to
       * log it as such.  This means that we have to copy the link
       * count from the new field to the old.  We don't have to worry
       * about the new fields, because nothing trusts them as long as
       * the old inode version number is there.  If the superblock already
       * has a new version number, then we don't bother converting back.
       */
      mp = ip->i_mount;
      ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 ||
             XFS_SB_VERSION_HASNLINK(&mp->m_sb));
      if (ip->i_d.di_version == XFS_DINODE_VERSION_1) {
            if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) {
                  /*
                   * Convert it back.
                   */
                  ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
                  ip->i_d.di_onlink = ip->i_d.di_nlink;
            } else {
                  /*
                   * The superblock version has already been bumped,
                   * so just make the conversion to the new inode
                   * format permanent.
                   */
                  ip->i_d.di_version = XFS_DINODE_VERSION_2;
                  ip->i_d.di_onlink = 0;
                  memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
            }
      }

      switch (ip->i_d.di_format) {
      case XFS_DINODE_FMT_EXTENTS:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
                    XFS_ILOG_DEV | XFS_ILOG_UUID)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
                  ASSERT(ip->i_df.if_bytes > 0);
                  ASSERT(ip->i_df.if_u1.if_extents != NULL);
                  ASSERT(ip->i_d.di_nextents > 0);
                  ASSERT(iip->ili_extents_buf == NULL);
                  nrecs = ip->i_df.if_bytes /
                        (uint)sizeof(xfs_bmbt_rec_t);
                  ASSERT(nrecs > 0);
#ifdef XFS_NATIVE_HOST
                  if (nrecs == ip->i_d.di_nextents) {
                        /*
                         * There are no delayed allocation
                         * extents, so just point to the
                         * real extents array.
                         */
                        vecp->i_addr =
                              (char *)(ip->i_df.if_u1.if_extents);
                        vecp->i_len = ip->i_df.if_bytes;
                        XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
                  } else
#endif
                  {
                        /*
                         * There are delayed allocation extents
                         * in the inode, or we need to convert
                         * the extents to on disk format.
                         * Use xfs_iextents_copy()
                         * to copy only the real extents into
                         * a separate buffer.  We'll free the
                         * buffer in the unlock routine.
                         */
                        ext_buffer = kmem_alloc(ip->i_df.if_bytes,
                              KM_SLEEP);
                        iip->ili_extents_buf = ext_buffer;
                        vecp->i_addr = (xfs_caddr_t)ext_buffer;
                        vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
                                    XFS_DATA_FORK);
                        XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
                  }
                  ASSERT(vecp->i_len <= ip->i_df.if_bytes);
                  iip->ili_format.ilf_dsize = vecp->i_len;
                  vecp++;
                  nvecs++;
            }
            break;

      case XFS_DINODE_FMT_BTREE:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
                    XFS_ILOG_DEV | XFS_ILOG_UUID)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
                  ASSERT(ip->i_df.if_broot_bytes > 0);
                  ASSERT(ip->i_df.if_broot != NULL);
                  vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
                  vecp->i_len = ip->i_df.if_broot_bytes;
                  XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
                  vecp++;
                  nvecs++;
                  iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
            }
            break;

      case XFS_DINODE_FMT_LOCAL:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
                    XFS_ILOG_DEV | XFS_ILOG_UUID)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
                  ASSERT(ip->i_df.if_bytes > 0);
                  ASSERT(ip->i_df.if_u1.if_data != NULL);
                  ASSERT(ip->i_d.di_size > 0);

                  vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
                  /*
                   * Round i_bytes up to a word boundary.
                   * The underlying memory is guaranteed to
                   * to be there by xfs_idata_realloc().
                   */
                  data_bytes = roundup(ip->i_df.if_bytes, 4);
                  ASSERT((ip->i_df.if_real_bytes == 0) ||
                         (ip->i_df.if_real_bytes == data_bytes));
                  vecp->i_len = (int)data_bytes;
                  XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
                  vecp++;
                  nvecs++;
                  iip->ili_format.ilf_dsize = (unsigned)data_bytes;
            }
            break;

      case XFS_DINODE_FMT_DEV:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
                    XFS_ILOG_DDATA | XFS_ILOG_UUID)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
                  iip->ili_format.ilf_u.ilfu_rdev =
                        ip->i_df.if_u2.if_rdev;
            }
            break;

      case XFS_DINODE_FMT_UUID:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
                    XFS_ILOG_DDATA | XFS_ILOG_DEV)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
                  iip->ili_format.ilf_u.ilfu_uuid =
                        ip->i_df.if_u2.if_uuid;
            }
            break;

      default:
            ASSERT(0);
            break;
      }

      /*
       * If there are no attributes associated with the file,
       * then we're done.
       * Assert that no attribute-related log flags are set.
       */
      if (!XFS_IFORK_Q(ip)) {
            ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
            iip->ili_format.ilf_size = nvecs;
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
            return;
      }

      switch (ip->i_d.di_aformat) {
      case XFS_DINODE_FMT_EXTENTS:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
                  ASSERT(ip->i_afp->if_bytes > 0);
                  ASSERT(ip->i_afp->if_u1.if_extents != NULL);
                  ASSERT(ip->i_d.di_anextents > 0);
#ifdef DEBUG
                  nrecs = ip->i_afp->if_bytes /
                        (uint)sizeof(xfs_bmbt_rec_t);
#endif
                  ASSERT(nrecs > 0);
                  ASSERT(nrecs == ip->i_d.di_anextents);
#ifdef XFS_NATIVE_HOST
                  /*
                   * There are not delayed allocation extents
                   * for attributes, so just point at the array.
                   */
                  vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
                  vecp->i_len = ip->i_afp->if_bytes;
#else
                  ASSERT(iip->ili_aextents_buf == NULL);
                  /*
                   * Need to endian flip before logging
                   */
                  ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
                        KM_SLEEP);
                  iip->ili_aextents_buf = ext_buffer;
                  vecp->i_addr = (xfs_caddr_t)ext_buffer;
                  vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
                              XFS_ATTR_FORK);
#endif
                  XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
                  iip->ili_format.ilf_asize = vecp->i_len;
                  vecp++;
                  nvecs++;
            }
            break;

      case XFS_DINODE_FMT_BTREE:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
                  ASSERT(ip->i_afp->if_broot_bytes > 0);
                  ASSERT(ip->i_afp->if_broot != NULL);
                  vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
                  vecp->i_len = ip->i_afp->if_broot_bytes;
                  XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
                  vecp++;
                  nvecs++;
                  iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
            }
            break;

      case XFS_DINODE_FMT_LOCAL:
            ASSERT(!(iip->ili_format.ilf_fields &
                   (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
            if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
                  ASSERT(ip->i_afp->if_bytes > 0);
                  ASSERT(ip->i_afp->if_u1.if_data != NULL);

                  vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
                  /*
                   * Round i_bytes up to a word boundary.
                   * The underlying memory is guaranteed to
                   * to be there by xfs_idata_realloc().
                   */
                  data_bytes = roundup(ip->i_afp->if_bytes, 4);
                  ASSERT((ip->i_afp->if_real_bytes == 0) ||
                         (ip->i_afp->if_real_bytes == data_bytes));
                  vecp->i_len = (int)data_bytes;
                  XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
                  vecp++;
                  nvecs++;
                  iip->ili_format.ilf_asize = (unsigned)data_bytes;
            }
            break;

      default:
            ASSERT(0);
            break;
      }

      ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
      iip->ili_format.ilf_size = nvecs;
}


/*
 * This is called to pin the inode associated with the inode log
 * item in memory so it cannot be written out.  Do this by calling
 * xfs_ipin() to bump the pin count in the inode while holding the
 * inode pin lock.
 */
STATIC void
xfs_inode_item_pin(
      xfs_inode_log_item_t    *iip)
{
      ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
      xfs_ipin(iip->ili_inode);
}


/*
 * This is called to unpin the inode associated with the inode log
 * item which was previously pinned with a call to xfs_inode_item_pin().
 * Just call xfs_iunpin() on the inode to do this.
 */
/* ARGSUSED */
STATIC void
xfs_inode_item_unpin(
      xfs_inode_log_item_t    *iip,
      int               stale)
{
      xfs_iunpin(iip->ili_inode);
}

/* ARGSUSED */
STATIC void
xfs_inode_item_unpin_remove(
      xfs_inode_log_item_t    *iip,
      xfs_trans_t       *tp)
{
      xfs_iunpin(iip->ili_inode);
}

/*
 * This is called to attempt to lock the inode associated with this
 * inode log item, in preparation for the push routine which does the actual
 * iflush.  Don't sleep on the inode lock or the flush lock.
 *
 * If the flush lock is already held, indicating that the inode has
 * been or is in the process of being flushed, then (ideally) we'd like to
 * see if the inode's buffer is still incore, and if so give it a nudge.
 * We delay doing so until the pushbuf routine, though, to avoid holding
 * the AIL lock across a call to the blackhole which is the buffer cache.
 * Also we don't want to sleep in any device strategy routines, which can happen
 * if we do the subsequent bawrite in here.
 */
STATIC uint
xfs_inode_item_trylock(
      xfs_inode_log_item_t    *iip)
{
      register xfs_inode_t    *ip;

      ip = iip->ili_inode;

      if (xfs_ipincount(ip) > 0) {
            return XFS_ITEM_PINNED;
      }

      if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
            return XFS_ITEM_LOCKED;
      }

      if (!xfs_iflock_nowait(ip)) {
            /*
             * If someone else isn't already trying to push the inode
             * buffer, we get to do it.
             */
            if (iip->ili_pushbuf_flag == 0) {
                  iip->ili_pushbuf_flag = 1;
#ifdef DEBUG
                  iip->ili_push_owner = current_pid();
#endif
                  /*
                   * Inode is left locked in shared mode.
                   * Pushbuf routine gets to unlock it.
                   */
                  return XFS_ITEM_PUSHBUF;
            } else {
                  /*
                   * We hold the AIL_LOCK, so we must specify the
                   * NONOTIFY flag so that we won't double trip.
                   */
                  xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
                  return XFS_ITEM_FLUSHING;
            }
            /* NOTREACHED */
      }

      /* Stale items should force out the iclog */
      if (ip->i_flags & XFS_ISTALE) {
            xfs_ifunlock(ip);
            xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
            return XFS_ITEM_PINNED;
      }

#ifdef DEBUG
      if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
            ASSERT(iip->ili_format.ilf_fields != 0);
            ASSERT(iip->ili_logged == 0);
            ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
      }
#endif
      return XFS_ITEM_SUCCESS;
}

/*
 * Unlock the inode associated with the inode log item.
 * Clear the fields of the inode and inode log item that
 * are specific to the current transaction.  If the
 * hold flags is set, do not unlock the inode.
 */
STATIC void
xfs_inode_item_unlock(
      xfs_inode_log_item_t    *iip)
{
      uint        hold;
      uint        iolocked;
      uint        lock_flags;
      xfs_inode_t *ip;

      ASSERT(iip != NULL);
      ASSERT(iip->ili_inode->i_itemp != NULL);
      ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
      ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
              XFS_ILI_IOLOCKED_EXCL)) ||
             ismrlocked(&(iip->ili_inode->i_iolock), MR_UPDATE));
      ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
              XFS_ILI_IOLOCKED_SHARED)) ||
             ismrlocked(&(iip->ili_inode->i_iolock), MR_ACCESS));
      /*
       * Clear the transaction pointer in the inode.
       */
      ip = iip->ili_inode;
      ip->i_transp = NULL;

      /*
       * If the inode needed a separate buffer with which to log
       * its extents, then free it now.
       */
      if (iip->ili_extents_buf != NULL) {
            ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
            ASSERT(ip->i_d.di_nextents > 0);
            ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
            ASSERT(ip->i_df.if_bytes > 0);
            kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes);
            iip->ili_extents_buf = NULL;
      }
      if (iip->ili_aextents_buf != NULL) {
            ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
            ASSERT(ip->i_d.di_anextents > 0);
            ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
            ASSERT(ip->i_afp->if_bytes > 0);
            kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes);
            iip->ili_aextents_buf = NULL;
      }

      /*
       * Figure out if we should unlock the inode or not.
       */
      hold = iip->ili_flags & XFS_ILI_HOLD;

      /*
       * Before clearing out the flags, remember whether we
       * are holding the inode's IO lock.
       */
      iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;

      /*
       * Clear out the fields of the inode log item particular
       * to the current transaction.
       */
      iip->ili_ilock_recur = 0;
      iip->ili_iolock_recur = 0;
      iip->ili_flags = 0;

      /*
       * Unlock the inode if XFS_ILI_HOLD was not set.
       */
      if (!hold) {
            lock_flags = XFS_ILOCK_EXCL;
            if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
                  lock_flags |= XFS_IOLOCK_EXCL;
            } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
                  lock_flags |= XFS_IOLOCK_SHARED;
            }
            xfs_iput(iip->ili_inode, lock_flags);
      }
}

/*
 * This is called to find out where the oldest active copy of the
 * inode log item in the on disk log resides now that the last log
 * write of it completed at the given lsn.  Since we always re-log
 * all dirty data in an inode, the latest copy in the on disk log
 * is the only one that matters.  Therefore, simply return the
 * given lsn.
 */
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_inode_item_committed(
      xfs_inode_log_item_t    *iip,
      xfs_lsn_t         lsn)
{
      return (lsn);
}

/*
 * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
 * failed to get the inode flush lock but did get the inode locked SHARED.
 * Here we're trying to see if the inode buffer is incore, and if so whether it's
 * marked delayed write. If that's the case, we'll initiate a bawrite on that
 * buffer to expedite the process.
 *
 * We aren't holding the AIL_LOCK (or the flush lock) when this gets called,
 * so it is inherently race-y.
 */
STATIC void
xfs_inode_item_pushbuf(
      xfs_inode_log_item_t    *iip)
{
      xfs_inode_t *ip;
      xfs_mount_t *mp;
      xfs_buf_t   *bp;
      uint        dopush;

      ip = iip->ili_inode;

      ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));

      /*
       * The ili_pushbuf_flag keeps others from
       * trying to duplicate our effort.
       */
      ASSERT(iip->ili_pushbuf_flag != 0);
      ASSERT(iip->ili_push_owner == current_pid());

      /*
       * If flushlock isn't locked anymore, chances are that the
       * inode flush completed and the inode was taken off the AIL.
       * So, just get out.
       */
      if (!issemalocked(&(ip->i_flock)) ||
          ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
            iip->ili_pushbuf_flag = 0;
            xfs_iunlock(ip, XFS_ILOCK_SHARED);
            return;
      }

      mp = ip->i_mount;
      bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
                iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);

      if (bp != NULL) {
            if (XFS_BUF_ISDELAYWRITE(bp)) {
                  /*
                   * We were racing with iflush because we don't hold
                   * the AIL_LOCK or the flush lock. However, at this point,
                   * we have the buffer, and we know that it's dirty.
                   * So, it's possible that iflush raced with us, and
                   * this item is already taken off the AIL.
                   * If not, we can flush it async.
                   */
                  dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
                          issemalocked(&(ip->i_flock)));
                  iip->ili_pushbuf_flag = 0;
                  xfs_iunlock(ip, XFS_ILOCK_SHARED);
                  xfs_buftrace("INODE ITEM PUSH", bp);
                  if (XFS_BUF_ISPINNED(bp)) {
                        xfs_log_force(mp, (xfs_lsn_t)0,
                                    XFS_LOG_FORCE);
                  }
                  if (dopush) {
                        xfs_bawrite(mp, bp);
                  } else {
                        xfs_buf_relse(bp);
                  }
            } else {
                  iip->ili_pushbuf_flag = 0;
                  xfs_iunlock(ip, XFS_ILOCK_SHARED);
                  xfs_buf_relse(bp);
            }
            return;
      }
      /*
       * We have to be careful about resetting pushbuf flag too early (above).
       * Even though in theory we can do it as soon as we have the buflock,
       * we don't want others to be doing work needlessly. They'll come to
       * this function thinking that pushing the buffer is their
       * responsibility only to find that the buffer is still locked by
       * another doing the same thing
       */
      iip->ili_pushbuf_flag = 0;
      xfs_iunlock(ip, XFS_ILOCK_SHARED);
      return;
}


/*
 * This is called to asynchronously write the inode associated with this
 * inode log item out to disk. The inode will already have been locked by
 * a successful call to xfs_inode_item_trylock().
 */
STATIC void
xfs_inode_item_push(
      xfs_inode_log_item_t    *iip)
{
      xfs_inode_t *ip;

      ip = iip->ili_inode;

      ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
      ASSERT(issemalocked(&(ip->i_flock)));
      /*
       * Since we were able to lock the inode's flush lock and
       * we found it on the AIL, the inode must be dirty.  This
       * is because the inode is removed from the AIL while still
       * holding the flush lock in xfs_iflush_done().  Thus, if
       * we found it in the AIL and were able to obtain the flush
       * lock without sleeping, then there must not have been
       * anyone in the process of flushing the inode.
       */
      ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
             iip->ili_format.ilf_fields != 0);

      /*
       * Write out the inode.  The completion routine ('iflush_done') will
       * pull it from the AIL, mark it clean, unlock the flush lock.
       */
      (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
      xfs_iunlock(ip, XFS_ILOCK_SHARED);

      return;
}

/*
 * XXX rcc - this one really has to do something.  Probably needs
 * to stamp in a new field in the incore inode.
 */
/* ARGSUSED */
STATIC void
xfs_inode_item_committing(
      xfs_inode_log_item_t    *iip,
      xfs_lsn_t         lsn)
{
      iip->ili_last_lsn = lsn;
      return;
}

/*
 * This is the ops vector shared by all buf log items.
 */
static struct xfs_item_ops xfs_inode_item_ops = {
      .iop_size   = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
      .iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                              xfs_inode_item_format,
      .iop_pin    = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
      .iop_unpin  = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
      .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
                              xfs_inode_item_unpin_remove,
      .iop_trylock      = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
      .iop_unlock = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
      .iop_committed    = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
                              xfs_inode_item_committed,
      .iop_push   = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
      .iop_pushbuf      = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
      .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
                              xfs_inode_item_committing
};


/*
 * Initialize the inode log item for a newly allocated (in-core) inode.
 */
void
xfs_inode_item_init(
      xfs_inode_t *ip,
      xfs_mount_t *mp)
{
      xfs_inode_log_item_t    *iip;

      ASSERT(ip->i_itemp == NULL);
      iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);

      iip->ili_item.li_type = XFS_LI_INODE;
      iip->ili_item.li_ops = &xfs_inode_item_ops;
      iip->ili_item.li_mountp = mp;
      iip->ili_inode = ip;

      /*
         We have zeroed memory. No need ...
         iip->ili_extents_buf = NULL;
         iip->ili_pushbuf_flag = 0;
       */

      iip->ili_format.ilf_type = XFS_LI_INODE;
      iip->ili_format.ilf_ino = ip->i_ino;
      iip->ili_format.ilf_blkno = ip->i_blkno;
      iip->ili_format.ilf_len = ip->i_len;
      iip->ili_format.ilf_boffset = ip->i_boffset;
}

/*
 * Free the inode log item and any memory hanging off of it.
 */
void
xfs_inode_item_destroy(
      xfs_inode_t *ip)
{
#ifdef XFS_TRANS_DEBUG
      if (ip->i_itemp->ili_root_size != 0) {
            kmem_free(ip->i_itemp->ili_orig_root,
                    ip->i_itemp->ili_root_size);
      }
#endif
      kmem_zone_free(xfs_ili_zone, ip->i_itemp);
}


/*
 * This is the inode flushing I/O completion routine.  It is called
 * from interrupt level when the buffer containing the inode is
 * flushed to disk.  It is responsible for removing the inode item
 * from the AIL if it has not been re-logged, and unlocking the inode's
 * flush lock.
 */
/*ARGSUSED*/
void
xfs_iflush_done(
      xfs_buf_t         *bp,
      xfs_inode_log_item_t    *iip)
{
      xfs_inode_t *ip;
      SPLDECL(s);

      ip = iip->ili_inode;

      /*
       * We only want to pull the item from the AIL if it is
       * actually there and its location in the log has not
       * changed since we started the flush.  Thus, we only bother
       * if the ili_logged flag is set and the inode's lsn has not
       * changed.  First we check the lsn outside
       * the lock since it's cheaper, and then we recheck while
       * holding the lock before removing the inode from the AIL.
       */
      if (iip->ili_logged &&
          (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
            AIL_LOCK(ip->i_mount, s);
            if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
                  /*
                   * xfs_trans_delete_ail() drops the AIL lock.
                   */
                  xfs_trans_delete_ail(ip->i_mount,
                                   (xfs_log_item_t*)iip, s);
            } else {
                  AIL_UNLOCK(ip->i_mount, s);
            }
      }

      iip->ili_logged = 0;

      /*
       * Clear the ili_last_fields bits now that we know that the
       * data corresponding to them is safely on disk.
       */
      iip->ili_last_fields = 0;

      /*
       * Release the inode's flush lock since we're done with it.
       */
      xfs_ifunlock(ip);

      return;
}

/*
 * This is the inode flushing abort routine.  It is called
 * from xfs_iflush when the filesystem is shutting down to clean
 * up the inode state.
 * It is responsible for removing the inode item
 * from the AIL if it has not been re-logged, and unlocking the inode's
 * flush lock.
 */
void
xfs_iflush_abort(
      xfs_inode_t       *ip)
{
      xfs_inode_log_item_t    *iip;
      xfs_mount_t       *mp;
      SPLDECL(s);

      iip = ip->i_itemp;
      mp = ip->i_mount;
      if (iip) {
            if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
                  AIL_LOCK(mp, s);
                  if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
                        /*
                         * xfs_trans_delete_ail() drops the AIL lock.
                         */
                        xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip,
                              s);
                  } else
                        AIL_UNLOCK(mp, s);
            }
            iip->ili_logged = 0;
            /*
             * Clear the ili_last_fields bits now that we know that the
             * data corresponding to them is safely on disk.
             */
            iip->ili_last_fields = 0;
            /*
             * Clear the inode logging fields so no more flushes are
             * attempted.
             */
            iip->ili_format.ilf_fields = 0;
      }
      /*
       * Release the inode's flush lock since we're done with it.
       */
      xfs_ifunlock(ip);
}

void
xfs_istale_done(
      xfs_buf_t         *bp,
      xfs_inode_log_item_t    *iip)
{
      xfs_iflush_abort(iip->ili_inode);
}

/*
 * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
 * (which can have different field alignments) to the native version
 */
int
xfs_inode_item_format_convert(
      xfs_log_iovec_t         *buf,
      xfs_inode_log_format_t  *in_f)
{
      if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
            xfs_inode_log_format_32_t *in_f32;

            in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
            in_f->ilf_type = in_f32->ilf_type;
            in_f->ilf_size = in_f32->ilf_size;
            in_f->ilf_fields = in_f32->ilf_fields;
            in_f->ilf_asize = in_f32->ilf_asize;
            in_f->ilf_dsize = in_f32->ilf_dsize;
            in_f->ilf_ino = in_f32->ilf_ino;
            /* copy biggest field of ilf_u */
            memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
                   in_f32->ilf_u.ilfu_uuid.__u_bits,
                   sizeof(uuid_t));
            in_f->ilf_blkno = in_f32->ilf_blkno;
            in_f->ilf_len = in_f32->ilf_len;
            in_f->ilf_boffset = in_f32->ilf_boffset;
            return 0;
      } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
            xfs_inode_log_format_64_t *in_f64;

            in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
            in_f->ilf_type = in_f64->ilf_type;
            in_f->ilf_size = in_f64->ilf_size;
            in_f->ilf_fields = in_f64->ilf_fields;
            in_f->ilf_asize = in_f64->ilf_asize;
            in_f->ilf_dsize = in_f64->ilf_dsize;
            in_f->ilf_ino = in_f64->ilf_ino;
            /* copy biggest field of ilf_u */
            memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
                   in_f64->ilf_u.ilfu_uuid.__u_bits,
                   sizeof(uuid_t));
            in_f->ilf_blkno = in_f64->ilf_blkno;
            in_f->ilf_len = in_f64->ilf_len;
            in_f->ilf_boffset = in_f64->ilf_boffset;
            return 0;
      }
      return EFSCORRUPTED;
}

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