/*
 * 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;
}