fs/xfs/xfs_rw.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_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_dinode.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_error.h"
  32 #include "xfs_rw.h"
  33
  34 /*
  35  * Force a shutdown of the filesystem instantly while keeping
  36  * the filesystem consistent. We don't do an unmount here; just shutdown
  37  * the shop, make sure that absolutely nothing persistent happens to
  38  * this filesystem after this point.
  39  */
  40 void
  41 xfs_do_force_shutdown(
  42         xfs_mount_t     *mp,
  43         int             flags,
  44         char            *fname,
  45         int             lnnum)
  46 {
  47         int             logerror;
  48
  49         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
  50
  51         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
  52                 xfs_notice(mp,
  53         "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
  54                         __func__, flags, lnnum, fname, __return_address);
  55         }
  56         /*
  57          * No need to duplicate efforts.
  58          */
  59         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
  60                 return;
  61
  62         /*
  63          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
  64          * queue up anybody new on the log reservations, and wakes up
  65          * everybody who's sleeping on log reservations to tell them
  66          * the bad news.
  67          */
  68         if (xfs_log_force_umount(mp, logerror))
  69                 return;
  70
  71         if (flags & SHUTDOWN_CORRUPT_INCORE) {
  72                 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
  73     "Corruption of in-memory data detected.  Shutting down filesystem");
  74                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
  75                         xfs_stack_trace();
  76         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
  77                 if (logerror) {
  78                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
  79                 "Log I/O Error Detected.  Shutting down filesystem");
  80                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
  81                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
  82                 "All device paths lost.  Shutting down filesystem");
  83                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
  84                         xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
  85                 "I/O Error Detected. Shutting down filesystem");
  86                 }
  87         }
  88         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
  89                 xfs_alert(mp,
  90         "Please umount the filesystem and rectify the problem(s)");
  91         }
  92 }
  93
  94 /*
  95  * Prints out an ALERT message about I/O error.
  96  */
  97 void
  98 xfs_ioerror_alert(
  99         char                    *func,
 100         struct xfs_mount        *mp,
 101         xfs_buf_t               *bp,
 102         xfs_daddr_t             blkno)
 103 {
 104         xfs_alert(mp,
 105                  "I/O error occurred: meta-data dev %s block 0x%llx"
 106                  "       (\"%s\") error %d buf count %zd",
 107                 XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
 108                 (__uint64_t)blkno, func,
 109                 XFS_BUF_GETERROR(bp), XFS_BUF_COUNT(bp));
 110 }
 111
 112 /*
 113  * This isn't an absolute requirement, but it is
 114  * just a good idea to call xfs_read_buf instead of
 115  * directly doing a read_buf call. For one, we shouldn't
 116  * be doing this disk read if we are in SHUTDOWN state anyway,
 117  * so this stops that from happening. Secondly, this does all
 118  * the error checking stuff and the brelse if appropriate for
 119  * the caller, so the code can be a little leaner.
 120  */
 121
 122 int
 123 xfs_read_buf(
 124         struct xfs_mount *mp,
 125         xfs_buftarg_t    *target,
 126         xfs_daddr_t      blkno,
 127         int              len,
 128         uint             flags,
 129         xfs_buf_t        **bpp)
 130 {
 131         xfs_buf_t        *bp;
 132         int              error;
 133
 134         if (!flags)
 135                 flags = XBF_LOCK | XBF_MAPPED;
 136
 137         bp = xfs_buf_read(target, blkno, len, flags);
 138         if (!bp)
 139                 return XFS_ERROR(EIO);
 140         error = XFS_BUF_GETERROR(bp);
 141         if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
 142                 *bpp = bp;
 143         } else {
 144                 *bpp = NULL;
 145                 if (error) {
 146                         xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
 147                 } else {
 148                         error = XFS_ERROR(EIO);
 149                 }
 150                 if (bp) {
 151                         XFS_BUF_UNDONE(bp);
 152                         XFS_BUF_UNDELAYWRITE(bp);
 153                         XFS_BUF_STALE(bp);
 154                         /*
 155                          * brelse clears B_ERROR and b_error
 156                          */
 157                         xfs_buf_relse(bp);
 158                 }
 159         }
 160         return (error);
 161 }
 162
 163 /*
 164  * helper function to extract extent size hint from inode
 165  */
 166 xfs_extlen_t
 167 xfs_get_extsz_hint(
 168         struct xfs_inode        *ip)
 169 {
 170         if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
 171                 return ip->i_d.di_extsize;
 172         if (XFS_IS_REALTIME_INODE(ip))
 173                 return ip->i_mount->m_sb.sb_rextsize;
 174         return 0;
 175 }