/*

   * Copyright (c) 2000-2006 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_sb.h"
  #include "xfs_ag.h"

  #include "xfs_mount.h"

  #include "xfs_bmap_btree.h"

  #include "xfs_dinode.h"
  #include "xfs_inode.h"

  #include "xfs_error.h"

  #include "xfs_rw.h"
  
  /*

   * Force a shutdown of the filesystem instantly while keeping
   * the filesystem consistent. We don't do an unmount here; just shutdown
   * the shop, make sure that absolutely nothing persistent happens to
   * this filesystem after this point.
   */

  void
  xfs_do_force_shutdown(

  	xfs_mount_t	*mp,

  	int		flags,
  	char		*fname,
  	int		lnnum)
  {
  	int		logerror;

  	logerror = flags & SHUTDOWN_LOG_IO_ERROR;

  	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {

  		xfs_notice(mp,
  	"%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
  			__func__, flags, lnnum, fname, __return_address);

  	}
  	/*
  	 * No need to duplicate efforts.
  	 */
  	if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
  		return;
  
  	/*
  	 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
  	 * queue up anybody new on the log reservations, and wakes up

  	 * everybody who's sleeping on log reservations to tell them
  	 * the bad news.

  	 */
  	if (xfs_log_force_umount(mp, logerror))
  		return;

  	if (flags & SHUTDOWN_CORRUPT_INCORE) {

  		xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
      "Corruption of in-memory data detected.  Shutting down filesystem");
  		if (XFS_ERRLEVEL_HIGH <= xfs_error_level)

  			xfs_stack_trace();

  	} else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {

  		if (logerror) {

  			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
  		"Log I/O Error Detected.  Shutting down filesystem");

  		} else if (flags & SHUTDOWN_DEVICE_REQ) {

  			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
  		"All device paths lost.  Shutting down filesystem");

  		} else if (!(flags & SHUTDOWN_REMOTE_REQ)) {

  			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
  		"I/O Error Detected. Shutting down filesystem");

  		}
  	}

  	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {

  		xfs_alert(mp,
  	"Please umount the filesystem and rectify the problem(s)");

  	}
  }

  /*
   * Prints out an ALERT message about I/O error.
   */
  void
  xfs_ioerror_alert(
  	char			*func,
  	struct xfs_mount	*mp,
  	xfs_buf_t		*bp,
  	xfs_daddr_t		blkno)
  {

  	xfs_alert(mp,
  		 "I/O error occurred: meta-data dev %s block 0x%llx"
  		 "       (\"%s\") error %d buf count %zd",

  		XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
  		(__uint64_t)blkno, func,
  		XFS_BUF_GETERROR(bp), XFS_BUF_COUNT(bp));

  }
  
  /*
   * This isn't an absolute requirement, but it is
   * just a good idea to call xfs_read_buf instead of
   * directly doing a read_buf call. For one, we shouldn't
   * be doing this disk read if we are in SHUTDOWN state anyway,
   * so this stops that from happening. Secondly, this does all
   * the error checking stuff and the brelse if appropriate for
   * the caller, so the code can be a little leaner.
   */
  
  int
  xfs_read_buf(
  	struct xfs_mount *mp,
  	xfs_buftarg_t	 *target,
  	xfs_daddr_t	 blkno,
  	int              len,
  	uint             flags,
  	xfs_buf_t	 **bpp)
  {
  	xfs_buf_t	 *bp;
  	int		 error;

  	if (!flags)
  		flags = XBF_LOCK | XBF_MAPPED;
  
  	bp = xfs_buf_read(target, blkno, len, flags);

  	if (!bp)
  		return XFS_ERROR(EIO);
  	error = XFS_BUF_GETERROR(bp);
  	if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
  		*bpp = bp;
  	} else {
  		*bpp = NULL;
  		if (error) {
  			xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
  		} else {
  			error = XFS_ERROR(EIO);
  		}
  		if (bp) {
  			XFS_BUF_UNDONE(bp);
  			XFS_BUF_UNDELAYWRITE(bp);
  			XFS_BUF_STALE(bp);
  			/*
  			 * brelse clears B_ERROR and b_error
  			 */
  			xfs_buf_relse(bp);
  		}
  	}
  	return (error);
  }
  
  /*

   * helper function to extract extent size hint from inode
   */
  xfs_extlen_t
  xfs_get_extsz_hint(
  	struct xfs_inode	*ip)
  {

  	if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
  		return ip->i_d.di_extsize;
  	if (XFS_IS_REALTIME_INODE(ip))
  		return ip->i_mount->m_sb.sb_rextsize;
  	return 0;

  }