fs/xfs/xfs_rw.c

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include "xfs.h"
  34 #include "xfs_macros.h"
  35 #include "xfs_types.h"
  36 #include "xfs_inum.h"
  37 #include "xfs_log.h"
  38 #include "xfs_trans.h"
  39 #include "xfs_sb.h"
  40 #include "xfs_ag.h"
  41 #include "xfs_dir.h"
  42 #include "xfs_dir2.h"
  43 #include "xfs_dmapi.h"
  44 #include "xfs_mount.h"
  45 #include "xfs_alloc_btree.h"
  46 #include "xfs_bmap_btree.h"
  47 #include "xfs_ialloc_btree.h"
  48 #include "xfs_itable.h"
  49 #include "xfs_btree.h"
  50 #include "xfs_alloc.h"
  51 #include "xfs_ialloc.h"
  52 #include "xfs_attr.h"
  53 #include "xfs_attr_sf.h"
  54 #include "xfs_dir_sf.h"
  55 #include "xfs_dir2_sf.h"
  56 #include "xfs_dinode.h"
  57 #include "xfs_inode_item.h"
  58 #include "xfs_inode.h"
  59 #include "xfs_bmap.h"
  60 #include "xfs_acl.h"
  61 #include "xfs_mac.h"
  62 #include "xfs_error.h"
  63 #include "xfs_buf_item.h"
  64 #include "xfs_rw.h"
  65
  66 /*
  67  * This is a subroutine for xfs_write() and other writers (xfs_ioctl)
  68  * which clears the setuid and setgid bits when a file is written.
  69  */
  70 int
  71 xfs_write_clear_setuid(
  72         xfs_inode_t     *ip)
  73 {
  74         xfs_mount_t     *mp;
  75         xfs_trans_t     *tp;
  76         int             error;
  77
  78         mp = ip->i_mount;
  79         tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
  80         if ((error = xfs_trans_reserve(tp, 0,
  81                                       XFS_WRITEID_LOG_RES(mp),
  82                                       0, 0, 0))) {
  83                 xfs_trans_cancel(tp, 0);
  84                 return error;
  85         }
  86         xfs_ilock(ip, XFS_ILOCK_EXCL);
  87         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
  88         xfs_trans_ihold(tp, ip);
  89         ip->i_d.di_mode &= ~S_ISUID;
  90
  91         /*
  92          * Note that we don't have to worry about mandatory
  93          * file locking being disabled here because we only
  94          * clear the S_ISGID bit if the Group execute bit is
  95          * on, but if it was on then mandatory locking wouldn't
  96          * have been enabled.
  97          */
  98         if (ip->i_d.di_mode & S_IXGRP) {
  99                 ip->i_d.di_mode &= ~S_ISGID;
 100         }
 101         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 102         xfs_trans_set_sync(tp);
 103         error = xfs_trans_commit(tp, 0, NULL);
 104         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 105         return 0;
 106 }
 107
 108 /*
 109  * Force a shutdown of the filesystem instantly while keeping
 110  * the filesystem consistent. We don't do an unmount here; just shutdown
 111  * the shop, make sure that absolutely nothing persistent happens to
 112  * this filesystem after this point.
 113  */
 114
 115 void
 116 xfs_do_force_shutdown(
 117         bhv_desc_t      *bdp,
 118         int             flags,
 119         char            *fname,
 120         int             lnnum)
 121 {
 122         int             logerror;
 123         xfs_mount_t     *mp;
 124
 125         mp = XFS_BHVTOM(bdp);
 126         logerror = flags & XFS_LOG_IO_ERROR;
 127
 128         if (!(flags & XFS_FORCE_UMOUNT)) {
 129                 cmn_err(CE_NOTE,
 130                 "xfs_force_shutdown(%s,0x%x) called from line %d of file %s.  Return address = 0x%p",
 131                         mp->m_fsname,flags,lnnum,fname,__return_address);
 132         }
 133         /*
 134          * No need to duplicate efforts.
 135          */
 136         if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
 137                 return;
 138
 139         /*
 140          * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
 141          * queue up anybody new on the log reservations, and wakes up
 142          * everybody who's sleeping on log reservations and tells
 143          * them the bad news.
 144          */
 145         if (xfs_log_force_umount(mp, logerror))
 146                 return;
 147
 148         if (flags & XFS_CORRUPT_INCORE) {
 149                 xfs_cmn_err(XFS_PTAG_SHUTDOWN_CORRUPT, CE_ALERT, mp,
 150     "Corruption of in-memory data detected.  Shutting down filesystem: %s",
 151                         mp->m_fsname);
 152                 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) {
 153                         xfs_stack_trace();
 154                 }
 155         } else if (!(flags & XFS_FORCE_UMOUNT)) {
 156                 if (logerror) {
 157                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_LOGERROR, CE_ALERT, mp,
 158                         "Log I/O Error Detected.  Shutting down filesystem: %s",
 159                                 mp->m_fsname);
 160                 } else if (!(flags & XFS_SHUTDOWN_REMOTE_REQ)) {
 161                         xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
 162                                 "I/O Error Detected.  Shutting down filesystem: %s",
 163                                 mp->m_fsname);
 164                 }
 165         }
 166         if (!(flags & XFS_FORCE_UMOUNT)) {
 167                 cmn_err(CE_ALERT,
 168                 "Please umount the filesystem, and rectify the problem(s)");
 169         }
 170 }
 171
 172
 173 /*
 174  * Called when we want to stop a buffer from getting written or read.
 175  * We attach the EIO error, muck with its flags, and call biodone
 176  * so that the proper iodone callbacks get called.
 177  */
 178 int
 179 xfs_bioerror(
 180         xfs_buf_t *bp)
 181 {
 182
 183 #ifdef XFSERRORDEBUG
 184         ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone);
 185 #endif
 186
 187         /*
 188          * No need to wait until the buffer is unpinned.
 189          * We aren't flushing it.
 190          */
 191         xfs_buftrace("XFS IOERROR", bp);
 192         XFS_BUF_ERROR(bp, EIO);
 193         /*
 194          * We're calling biodone, so delete B_DONE flag. Either way
 195          * we have to call the iodone callback, and calling biodone
 196          * probably is the best way since it takes care of
 197          * GRIO as well.
 198          */
 199         XFS_BUF_UNREAD(bp);
 200         XFS_BUF_UNDELAYWRITE(bp);
 201         XFS_BUF_UNDONE(bp);
 202         XFS_BUF_STALE(bp);
 203
 204         XFS_BUF_CLR_BDSTRAT_FUNC(bp);
 205         xfs_biodone(bp);
 206
 207         return (EIO);
 208 }
 209
 210 /*
 211  * Same as xfs_bioerror, except that we are releasing the buffer
 212  * here ourselves, and avoiding the biodone call.
 213  * This is meant for userdata errors; metadata bufs come with
 214  * iodone functions attached, so that we can track down errors.
 215  */
 216 int
 217 xfs_bioerror_relse(
 218         xfs_buf_t *bp)
 219 {
 220         int64_t fl;
 221
 222         ASSERT(XFS_BUF_IODONE_FUNC(bp) != xfs_buf_iodone_callbacks);
 223         ASSERT(XFS_BUF_IODONE_FUNC(bp) != xlog_iodone);
 224
 225         xfs_buftrace("XFS IOERRELSE", bp);
 226         fl = XFS_BUF_BFLAGS(bp);
 227         /*
 228          * No need to wait until the buffer is unpinned.
 229          * We aren't flushing it.
 230          *
 231          * chunkhold expects B_DONE to be set, whether
 232          * we actually finish the I/O or not. We don't want to
 233          * change that interface.
 234          */
 235         XFS_BUF_UNREAD(bp);
 236         XFS_BUF_UNDELAYWRITE(bp);
 237         XFS_BUF_DONE(bp);
 238         XFS_BUF_STALE(bp);
 239         XFS_BUF_CLR_IODONE_FUNC(bp);
 240         XFS_BUF_CLR_BDSTRAT_FUNC(bp);
 241         if (!(fl & XFS_B_ASYNC)) {
 242                 /*
 243                  * Mark b_error and B_ERROR _both_.
 244                  * Lot's of chunkcache code assumes that.
 245                  * There's no reason to mark error for
 246                  * ASYNC buffers.
 247                  */
 248                 XFS_BUF_ERROR(bp, EIO);
 249                 XFS_BUF_V_IODONESEMA(bp);
 250         } else {
 251                 xfs_buf_relse(bp);
 252         }
 253         return (EIO);
 254 }
 255 /*
 256  * Prints out an ALERT message about I/O error.
 257  */
 258 void
 259 xfs_ioerror_alert(
 260         char                    *func,
 261         struct xfs_mount        *mp,
 262         xfs_buf_t               *bp,
 263         xfs_daddr_t             blkno)
 264 {
 265         cmn_err(CE_ALERT,
 266  "I/O error in filesystem (\"%s\") meta-data dev %s block 0x%llx"
 267  "       (\"%s\") error %d buf count %u",
 268                 (!mp || !mp->m_fsname) ? "(fs name not set)" : mp->m_fsname,
 269                 XFS_BUFTARG_NAME(bp->pb_target),
 270                 (__uint64_t)blkno,
 271                 func,
 272                 XFS_BUF_GETERROR(bp),
 273                 XFS_BUF_COUNT(bp));
 274 }
 275
 276 /*
 277  * This isn't an absolute requirement, but it is
 278  * just a good idea to call xfs_read_buf instead of
 279  * directly doing a read_buf call. For one, we shouldn't
 280  * be doing this disk read if we are in SHUTDOWN state anyway,
 281  * so this stops that from happening. Secondly, this does all
 282  * the error checking stuff and the brelse if appropriate for
 283  * the caller, so the code can be a little leaner.
 284  */
 285
 286 int
 287 xfs_read_buf(
 288         struct xfs_mount *mp,
 289         xfs_buftarg_t    *target,
 290         xfs_daddr_t      blkno,
 291         int              len,
 292         uint             flags,
 293         xfs_buf_t        **bpp)
 294 {
 295         xfs_buf_t        *bp;
 296         int              error;
 297
 298         if (flags)
 299                 bp = xfs_buf_read_flags(target, blkno, len, flags);
 300         else
 301                 bp = xfs_buf_read(target, blkno, len, flags);
 302         if (!bp)
 303                 return XFS_ERROR(EIO);
 304         error = XFS_BUF_GETERROR(bp);
 305         if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
 306                 *bpp = bp;
 307         } else {
 308                 *bpp = NULL;
 309                 if (error) {
 310                         xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
 311                 } else {
 312                         error = XFS_ERROR(EIO);
 313                 }
 314                 if (bp) {
 315                         XFS_BUF_UNDONE(bp);
 316                         XFS_BUF_UNDELAYWRITE(bp);
 317                         XFS_BUF_STALE(bp);
 318                         /*
 319                          * brelse clears B_ERROR and b_error
 320                          */
 321                         xfs_buf_relse(bp);
 322                 }
 323         }
 324         return (error);
 325 }
 326
 327 /*
 328  * Wrapper around bwrite() so that we can trap
 329  * write errors, and act accordingly.
 330  */
 331 int
 332 xfs_bwrite(
 333         struct xfs_mount *mp,
 334         struct xfs_buf   *bp)
 335 {
 336         int     error;
 337
 338         /*
 339          * XXXsup how does this work for quotas.
 340          */
 341         XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb);
 342         XFS_BUF_SET_FSPRIVATE3(bp, mp);
 343         XFS_BUF_WRITE(bp);
 344
 345         if ((error = XFS_bwrite(bp))) {
 346                 ASSERT(mp);
 347                 /*
 348                  * Cannot put a buftrace here since if the buffer is not
 349                  * B_HOLD then we will brelse() the buffer before returning
 350                  * from bwrite and we could be tracing a buffer that has
 351                  * been reused.
 352                  */
 353                 xfs_force_shutdown(mp, XFS_METADATA_IO_ERROR);
 354         }
 355         return (error);
 356 }