424 строки
11 KiB
C
424 строки
11 KiB
C
/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir2.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_itable.h"
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#include "xfs_btree.h"
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#include "xfs_alloc.h"
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#include "xfs_ialloc.h"
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#include "xfs_attr.h"
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#include "xfs_bmap.h"
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#include "xfs_acl.h"
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#include "xfs_error.h"
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#include "xfs_buf_item.h"
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#include "xfs_rw.h"
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/*
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* This is a subroutine for xfs_write() and other writers (xfs_ioctl)
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* which clears the setuid and setgid bits when a file is written.
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*/
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int
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xfs_write_clear_setuid(
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xfs_inode_t *ip)
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{
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xfs_mount_t *mp;
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xfs_trans_t *tp;
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int error;
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mp = ip->i_mount;
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tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
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if ((error = xfs_trans_reserve(tp, 0,
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XFS_WRITEID_LOG_RES(mp),
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0, 0, 0))) {
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xfs_trans_cancel(tp, 0);
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return error;
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}
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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xfs_trans_ihold(tp, ip);
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ip->i_d.di_mode &= ~S_ISUID;
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/*
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* Note that we don't have to worry about mandatory
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* file locking being disabled here because we only
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* clear the S_ISGID bit if the Group execute bit is
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* on, but if it was on then mandatory locking wouldn't
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* have been enabled.
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*/
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if (ip->i_d.di_mode & S_IXGRP) {
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ip->i_d.di_mode &= ~S_ISGID;
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}
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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xfs_trans_set_sync(tp);
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error = xfs_trans_commit(tp, 0);
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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return 0;
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}
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/*
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* Handle logging requirements of various synchronous types of write.
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*/
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int
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xfs_write_sync_logforce(
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xfs_mount_t *mp,
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xfs_inode_t *ip)
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{
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int error = 0;
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/*
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* If we're treating this as O_DSYNC and we have not updated the
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* size, force the log.
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*/
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if (!(mp->m_flags & XFS_MOUNT_OSYNCISOSYNC) &&
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!(ip->i_update_size)) {
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xfs_inode_log_item_t *iip = ip->i_itemp;
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/*
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* If an allocation transaction occurred
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* without extending the size, then we have to force
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* the log up the proper point to ensure that the
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* allocation is permanent. We can't count on
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* the fact that buffered writes lock out direct I/O
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* writes - the direct I/O write could have extended
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* the size nontransactionally, then finished before
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* we started. xfs_write_file will think that the file
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* didn't grow but the update isn't safe unless the
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* size change is logged.
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*
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* Force the log if we've committed a transaction
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* against the inode or if someone else has and
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* the commit record hasn't gone to disk (e.g.
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* the inode is pinned). This guarantees that
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* all changes affecting the inode are permanent
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* when we return.
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*/
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if (iip && iip->ili_last_lsn) {
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error = _xfs_log_force(mp, iip->ili_last_lsn,
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XFS_LOG_FORCE | XFS_LOG_SYNC, NULL);
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} else if (xfs_ipincount(ip) > 0) {
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error = _xfs_log_force(mp, (xfs_lsn_t)0,
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XFS_LOG_FORCE | XFS_LOG_SYNC, NULL);
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}
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} else {
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xfs_trans_t *tp;
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/*
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* O_SYNC or O_DSYNC _with_ a size update are handled
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* the same way.
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*
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* If the write was synchronous then we need to make
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* sure that the inode modification time is permanent.
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* We'll have updated the timestamp above, so here
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* we use a synchronous transaction to log the inode.
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* It's not fast, but it's necessary.
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*
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* If this a dsync write and the size got changed
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* non-transactionally, then we need to ensure that
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* the size change gets logged in a synchronous
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* transaction.
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*/
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tp = xfs_trans_alloc(mp, XFS_TRANS_WRITE_SYNC);
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if ((error = xfs_trans_reserve(tp, 0,
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XFS_SWRITE_LOG_RES(mp),
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0, 0, 0))) {
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/* Transaction reserve failed */
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xfs_trans_cancel(tp, 0);
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} else {
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/* Transaction reserve successful */
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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xfs_trans_ihold(tp, ip);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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xfs_trans_set_sync(tp);
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error = xfs_trans_commit(tp, 0);
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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}
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}
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return error;
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}
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/*
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* Force a shutdown of the filesystem instantly while keeping
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* the filesystem consistent. We don't do an unmount here; just shutdown
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* the shop, make sure that absolutely nothing persistent happens to
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* this filesystem after this point.
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*/
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void
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xfs_do_force_shutdown(
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xfs_mount_t *mp,
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int flags,
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char *fname,
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int lnnum)
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{
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int logerror;
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logerror = flags & SHUTDOWN_LOG_IO_ERROR;
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if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
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cmn_err(CE_NOTE, "xfs_force_shutdown(%s,0x%x) called from "
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"line %d of file %s. Return address = 0x%p",
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mp->m_fsname, flags, lnnum, fname, __return_address);
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}
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/*
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* No need to duplicate efforts.
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*/
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if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
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return;
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/*
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* This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
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* queue up anybody new on the log reservations, and wakes up
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* everybody who's sleeping on log reservations to tell them
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* the bad news.
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*/
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if (xfs_log_force_umount(mp, logerror))
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return;
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if (flags & SHUTDOWN_CORRUPT_INCORE) {
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xfs_cmn_err(XFS_PTAG_SHUTDOWN_CORRUPT, CE_ALERT, mp,
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"Corruption of in-memory data detected. Shutting down filesystem: %s",
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mp->m_fsname);
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if (XFS_ERRLEVEL_HIGH <= xfs_error_level) {
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xfs_stack_trace();
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}
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} else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
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if (logerror) {
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xfs_cmn_err(XFS_PTAG_SHUTDOWN_LOGERROR, CE_ALERT, mp,
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"Log I/O Error Detected. Shutting down filesystem: %s",
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mp->m_fsname);
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} else if (flags & SHUTDOWN_DEVICE_REQ) {
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xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
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"All device paths lost. Shutting down filesystem: %s",
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mp->m_fsname);
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} else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
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xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
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"I/O Error Detected. Shutting down filesystem: %s",
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mp->m_fsname);
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}
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}
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if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
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cmn_err(CE_ALERT, "Please umount the filesystem, "
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"and rectify the problem(s)");
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}
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}
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/*
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* Called when we want to stop a buffer from getting written or read.
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* We attach the EIO error, muck with its flags, and call biodone
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* so that the proper iodone callbacks get called.
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*/
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int
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xfs_bioerror(
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xfs_buf_t *bp)
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{
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#ifdef XFSERRORDEBUG
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ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone);
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#endif
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/*
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* No need to wait until the buffer is unpinned.
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* We aren't flushing it.
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*/
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xfs_buftrace("XFS IOERROR", bp);
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XFS_BUF_ERROR(bp, EIO);
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/*
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* We're calling biodone, so delete B_DONE flag. Either way
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* we have to call the iodone callback, and calling biodone
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* probably is the best way since it takes care of
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* GRIO as well.
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*/
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XFS_BUF_UNREAD(bp);
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XFS_BUF_UNDELAYWRITE(bp);
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XFS_BUF_UNDONE(bp);
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XFS_BUF_STALE(bp);
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XFS_BUF_CLR_BDSTRAT_FUNC(bp);
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xfs_biodone(bp);
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return (EIO);
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}
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/*
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* Same as xfs_bioerror, except that we are releasing the buffer
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* here ourselves, and avoiding the biodone call.
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* This is meant for userdata errors; metadata bufs come with
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* iodone functions attached, so that we can track down errors.
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*/
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int
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xfs_bioerror_relse(
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xfs_buf_t *bp)
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{
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int64_t fl;
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ASSERT(XFS_BUF_IODONE_FUNC(bp) != xfs_buf_iodone_callbacks);
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ASSERT(XFS_BUF_IODONE_FUNC(bp) != xlog_iodone);
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xfs_buftrace("XFS IOERRELSE", bp);
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fl = XFS_BUF_BFLAGS(bp);
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/*
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* No need to wait until the buffer is unpinned.
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* We aren't flushing it.
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*
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* chunkhold expects B_DONE to be set, whether
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* we actually finish the I/O or not. We don't want to
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* change that interface.
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*/
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XFS_BUF_UNREAD(bp);
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XFS_BUF_UNDELAYWRITE(bp);
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XFS_BUF_DONE(bp);
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XFS_BUF_STALE(bp);
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XFS_BUF_CLR_IODONE_FUNC(bp);
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XFS_BUF_CLR_BDSTRAT_FUNC(bp);
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if (!(fl & XFS_B_ASYNC)) {
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/*
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* Mark b_error and B_ERROR _both_.
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* Lot's of chunkcache code assumes that.
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* There's no reason to mark error for
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* ASYNC buffers.
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*/
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XFS_BUF_ERROR(bp, EIO);
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XFS_BUF_FINISH_IOWAIT(bp);
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} else {
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xfs_buf_relse(bp);
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}
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return (EIO);
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}
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/*
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* Prints out an ALERT message about I/O error.
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*/
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void
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xfs_ioerror_alert(
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char *func,
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struct xfs_mount *mp,
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xfs_buf_t *bp,
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xfs_daddr_t blkno)
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{
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cmn_err(CE_ALERT,
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"I/O error in filesystem (\"%s\") meta-data dev %s block 0x%llx"
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" (\"%s\") error %d buf count %zd",
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(!mp || !mp->m_fsname) ? "(fs name not set)" : mp->m_fsname,
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XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)),
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(__uint64_t)blkno, func,
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XFS_BUF_GETERROR(bp), XFS_BUF_COUNT(bp));
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}
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/*
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* This isn't an absolute requirement, but it is
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* just a good idea to call xfs_read_buf instead of
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* directly doing a read_buf call. For one, we shouldn't
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* be doing this disk read if we are in SHUTDOWN state anyway,
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* so this stops that from happening. Secondly, this does all
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* the error checking stuff and the brelse if appropriate for
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* the caller, so the code can be a little leaner.
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*/
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int
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xfs_read_buf(
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struct xfs_mount *mp,
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xfs_buftarg_t *target,
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xfs_daddr_t blkno,
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int len,
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uint flags,
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xfs_buf_t **bpp)
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{
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xfs_buf_t *bp;
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int error;
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if (flags)
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bp = xfs_buf_read_flags(target, blkno, len, flags);
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else
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bp = xfs_buf_read(target, blkno, len, flags);
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if (!bp)
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return XFS_ERROR(EIO);
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error = XFS_BUF_GETERROR(bp);
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if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
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*bpp = bp;
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} else {
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*bpp = NULL;
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if (error) {
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xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
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} else {
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error = XFS_ERROR(EIO);
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}
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if (bp) {
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XFS_BUF_UNDONE(bp);
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XFS_BUF_UNDELAYWRITE(bp);
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XFS_BUF_STALE(bp);
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/*
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* brelse clears B_ERROR and b_error
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*/
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xfs_buf_relse(bp);
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}
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}
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return (error);
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}
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/*
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* Wrapper around bwrite() so that we can trap
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* write errors, and act accordingly.
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*/
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int
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xfs_bwrite(
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struct xfs_mount *mp,
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struct xfs_buf *bp)
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{
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int error;
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/*
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* XXXsup how does this work for quotas.
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*/
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XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb);
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XFS_BUF_SET_FSPRIVATE3(bp, mp);
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XFS_BUF_WRITE(bp);
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if ((error = XFS_bwrite(bp))) {
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ASSERT(mp);
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/*
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* Cannot put a buftrace here since if the buffer is not
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* B_HOLD then we will brelse() the buffer before returning
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* from bwrite and we could be tracing a buffer that has
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* been reused.
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*/
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xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
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}
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return (error);
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}
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