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_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_inode_item.h"
  38 #include "xfs_itable.h"
  39 #include "xfs_btree.h"
  40 #include "xfs_alloc.h"
  41 #include "xfs_ialloc.h"
  42 #include "xfs_attr.h"
  43 #include "xfs_bmap.h"
  44 #include "xfs_error.h"
  45 #include "xfs_buf_item.h"
  46 #include "xfs_rw.h"
  47 #include "xfs_trace.h"
  48
  49 /*
  50  * Force a shutdown of the filesystem instantly while keeping
  51  * the filesystem consistent. We don't do an unmount here; just shutdown
  52  * the shop, make sure that absolutely nothing persistent happens to
  53  * this filesystem after this point.
  54  */
  55 void
  56 xfs_do_force_shutdown(
  57         xfs_mount_t     *mp,
  58         int             flags,
  59         char            *fname,
  60         int             lnnum)
  61 {
  62         int             logerror;
  63
  64         logerror = flags & SHUTDOWN_LOG_IO_ERROR;
  65
  66         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
  67                 cmn_err(CE_NOTE, "xfs_force_shutdown(%s,0x%x) called from "
  68                                  "line %d of file %s.  Return address = 0x%p",
  69                         mp->m_fsname, flags, lnnum, fname, __return_address);
  70         }
  71         /*
  72          * No need to duplicate efforts.
  73          */
  74         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
  75                 return;
  76
  77         /*
  78          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
  79          * queue up anybody new on the log reservations, and wakes up
  80          * everybody who's sleeping on log reservations to tell them
  81          * the bad news.
  82          */
  83         if (xfs_log_force_umount(mp, logerror))
  84                 return;
  85
  86         if (flags & SHUTDOWN_CORRUPT_INCORE) {
  87                 xfs_cmn_err(XFS_PTAG_SHUTDOWN_CORRUPT, CE_ALERT, mp,
  88     "Corruption of in-memory data detected.  Shutting down filesystem: %s",
  89                         mp->m_fsname);
  90                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) {
  91                         xfs_stack_trace();
  92                 }
  93         } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
  94                 if (logerror) {
  95                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_LOGERROR, CE_ALERT, mp,
  96                 "Log I/O Error Detected.  Shutting down filesystem: %s",
  97                                 mp->m_fsname);
  98                 } else if (flags & SHUTDOWN_DEVICE_REQ) {
  99                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
 100                 "All device paths lost.  Shutting down filesystem: %s",
 101                                 mp->m_fsname);
 102                 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
 103                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
 104                 "I/O Error Detected.  Shutting down filesystem: %s",
 105                                 mp->m_fsname);
 106                 }
 107         }
 108         if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
 109                 cmn_err(CE_ALERT, "Please umount the filesystem, "
 110                                   "and rectify the problem(s)");
 111         }
 112 }
 113
 114 /*
 115  * Prints out an ALERT message about I/O error.
 116  */
 117 void
 118 xfs_ioerror_alert(
 119         char                    *func,
 120         struct xfs_mount        *mp,
 121         xfs_buf_t               *bp,
 122         xfs_daddr_t             blkno)
 123 {
 124         cmn_err(CE_ALERT,
 125  "I/O error in filesystem (\"%s\") meta-data dev %s block 0x%llx"
 126  "       (\"%s\") error %d buf count %zd",
 127                 (!mp || !mp->m_fsname) ? "(fs name not set)" : mp->m_fsname,
 128                 XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
 129                 (__uint64_t)blkno, func,
 130                 XFS_BUF_GETERROR(bp), XFS_BUF_COUNT(bp));
 131 }
 132
 133 /*
 134  * This isn't an absolute requirement, but it is
 135  * just a good idea to call xfs_read_buf instead of
 136  * directly doing a read_buf call. For one, we shouldn't
 137  * be doing this disk read if we are in SHUTDOWN state anyway,
 138  * so this stops that from happening. Secondly, this does all
 139  * the error checking stuff and the brelse if appropriate for
 140  * the caller, so the code can be a little leaner.
 141  */
 142
 143 int
 144 xfs_read_buf(
 145         struct xfs_mount *mp,
 146         xfs_buftarg_t    *target,
 147         xfs_daddr_t      blkno,
 148         int              len,
 149         uint             flags,
 150         xfs_buf_t        **bpp)
 151 {
 152         xfs_buf_t        *bp;
 153         int              error;
 154
 155         if (!flags)
 156                 flags = XBF_LOCK | XBF_MAPPED;
 157
 158         bp = xfs_buf_read(target, blkno, len, flags);
 159         if (!bp)
 160                 return XFS_ERROR(EIO);
 161         error = XFS_BUF_GETERROR(bp);
 162         if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
 163                 *bpp = bp;
 164         } else {
 165                 *bpp = NULL;
 166                 if (error) {
 167                         xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
 168                 } else {
 169                         error = XFS_ERROR(EIO);
 170                 }
 171                 if (bp) {
 172                         XFS_BUF_UNDONE(bp);
 173                         XFS_BUF_UNDELAYWRITE(bp);
 174                         XFS_BUF_STALE(bp);
 175                         /*
 176                          * brelse clears B_ERROR and b_error
 177                          */
 178                         xfs_buf_relse(bp);
 179                 }
 180         }
 181         return (error);
 182 }
 183
 184 /*
 185  * helper function to extract extent size hint from inode
 186  */
 187 xfs_extlen_t
 188 xfs_get_extsz_hint(
 189         struct xfs_inode        *ip)
 190 {
 191         xfs_extlen_t            extsz;
 192
 193         if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
 194                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
 195                                 ? ip->i_d.di_extsize
 196                                 : ip->i_mount->m_sb.sb_rextsize;
 197                 ASSERT(extsz);
 198         } else {
 199                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
 200                                 ? ip->i_d.di_extsize : 0;
 201         }
 202
 203         return extsz;
 204 }