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                 cmn_err(CE_NOTE, "xfs_force_shutdown(%s,0x%x) called from "
  53                                  "line %d of file %s.  Return address = 0x%p",
  54                         mp->m_fsname, 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_cmn_err(XFS_PTAG_SHUTDOWN_CORRUPT, CE_ALERT, mp,
  73     "Corruption of in-memory data detected.  Shutting down filesystem: %s",
  74                         mp->m_fsname);
  75                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) {
  76                         xfs_stack_trace();
  77                 }
  78         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
  79                 if (logerror) {
  80                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_LOGERROR, CE_ALERT, mp,
  81                 "Log I/O Error Detected.  Shutting down filesystem: %s",
  82                                 mp->m_fsname);
  83                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
  84                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
  85                 "All device paths lost.  Shutting down filesystem: %s",
  86                                 mp->m_fsname);
  87                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
  88                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
  89                 "I/O Error Detected.  Shutting down filesystem: %s",
  90                                 mp->m_fsname);
  91                 }
  92         }
  93         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
  94                 cmn_err(CE_ALERT, "Please umount the filesystem, "
  95                                   "and rectify the problem(s)");
  96         }
  97 }
  98
  99 /*
 100  * Prints out an ALERT message about I/O error.
 101  */
 102 void
 103 xfs_ioerror_alert(
 104         char                    *func,
 105         struct xfs_mount        *mp,
 106         xfs_buf_t               *bp,
 107         xfs_daddr_t             blkno)
 108 {
 109         cmn_err(CE_ALERT,
 110  "I/O error in filesystem (\"%s\") meta-data dev %s block 0x%llx"
 111  "       (\"%s\") error %d buf count %zd",
 112                 (!mp || !mp->m_fsname) ? "(fs name not set)" : mp->m_fsname,
 113                 XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
 114                 (__uint64_t)blkno, func,
 115                 XFS_BUF_GETERROR(bp), XFS_BUF_COUNT(bp));
 116 }
 117
 118 /*
 119  * This isn't an absolute requirement, but it is
 120  * just a good idea to call xfs_read_buf instead of
 121  * directly doing a read_buf call. For one, we shouldn't
 122  * be doing this disk read if we are in SHUTDOWN state anyway,
 123  * so this stops that from happening. Secondly, this does all
 124  * the error checking stuff and the brelse if appropriate for
 125  * the caller, so the code can be a little leaner.
 126  */
 127
 128 int
 129 xfs_read_buf(
 130         struct xfs_mount *mp,
 131         xfs_buftarg_t    *target,
 132         xfs_daddr_t      blkno,
 133         int              len,
 134         uint             flags,
 135         xfs_buf_t        **bpp)
 136 {
 137         xfs_buf_t        *bp;
 138         int              error;
 139
 140         if (!flags)
 141                 flags = XBF_LOCK | XBF_MAPPED;
 142
 143         bp = xfs_buf_read(target, blkno, len, flags);
 144         if (!bp)
 145                 return XFS_ERROR(EIO);
 146         error = XFS_BUF_GETERROR(bp);
 147         if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
 148                 *bpp = bp;
 149         } else {
 150                 *bpp = NULL;
 151                 if (error) {
 152                         xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
 153                 } else {
 154                         error = XFS_ERROR(EIO);
 155                 }
 156                 if (bp) {
 157                         XFS_BUF_UNDONE(bp);
 158                         XFS_BUF_UNDELAYWRITE(bp);
 159                         XFS_BUF_STALE(bp);
 160                         /*
 161                          * brelse clears B_ERROR and b_error
 162                          */
 163                         xfs_buf_relse(bp);
 164                 }
 165         }
 166         return (error);
 167 }
 168
 169 /*
 170  * helper function to extract extent size hint from inode
 171  */
 172 xfs_extlen_t
 173 xfs_get_extsz_hint(
 174         struct xfs_inode        *ip)
 175 {
 176         xfs_extlen_t            extsz;
 177
 178         if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
 179                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
 180                                 ? ip->i_d.di_extsize
 181                                 : ip->i_mount->m_sb.sb_rextsize;
 182                 ASSERT(extsz);
 183         } else {
 184                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
 185                                 ? ip->i_d.di_extsize : 0;
 186         }
 187
 188         return extsz;
 189 }