patch-2.4.25 linux-2.4.25/fs/xfs/xfs_rw.c

• Lines: 357
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_rw.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_rw.c linux-2.4.25/fs/xfs/xfs_rw.c
@@ -0,0 +1,356 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_itable.h"
+#include "xfs_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_acl.h"
+#include "xfs_mac.h"
+#include "xfs_error.h"
+#include "xfs_buf_item.h"
+#include "xfs_rw.h"
+
+/*
+ * This is a subroutine for xfs_write() and other writers (xfs_ioctl)
+ * which clears the setuid and setgid bits when a file is written.
+ */
+int
+xfs_write_clear_setuid(
+	xfs_inode_t	*ip)
+{
+	xfs_mount_t	*mp;
+	xfs_trans_t	*tp;
+	int		error;
+
+	mp = ip->i_mount;
+	tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
+	if ((error = xfs_trans_reserve(tp, 0,
+				      XFS_WRITEID_LOG_RES(mp),
+				      0, 0, 0))) {
+		xfs_trans_cancel(tp, 0);
+		return error;
+	}
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+	xfs_trans_ihold(tp, ip);
+	ip->i_d.di_mode &= ~S_ISUID;
+
+	/*
+	 * Note that we don't have to worry about mandatory
+	 * file locking being disabled here because we only
+	 * clear the S_ISGID bit if the Group execute bit is
+	 * on, but if it was on then mandatory locking wouldn't
+	 * have been enabled.
+	 */
+	if (ip->i_d.di_mode & S_IXGRP) {
+		ip->i_d.di_mode &= ~S_ISGID;
+	}
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+	xfs_trans_set_sync(tp);
+	error = xfs_trans_commit(tp, 0, NULL);
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	return 0;
+}
+
+/*
+ * Force a shutdown of the filesystem instantly while keeping
+ * the filesystem consistent. We don't do an unmount here; just shutdown
+ * the shop, make sure that absolutely nothing persistent happens to
+ * this filesystem after this point.
+ */
+
+void
+xfs_do_force_shutdown(
+	bhv_desc_t	*bdp,
+	int		flags,
+	char		*fname,
+	int		lnnum)
+{
+	int		logerror;
+	xfs_mount_t	*mp;
+
+	mp = XFS_BHVTOM(bdp);
+	logerror = flags & XFS_LOG_IO_ERROR;
+
+	if (!(flags & XFS_FORCE_UMOUNT)) {
+		cmn_err(CE_NOTE,
+		"xfs_force_shutdown(%s,0x%x) called from line %d of file %s.  Return address = 0x%p",
+			mp->m_fsname,flags,lnnum,fname,__return_address);
+	}
+	/*
+	 * No need to duplicate efforts.
+	 */
+	if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
+		return;
+
+	/*
+	 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
+	 * queue up anybody new on the log reservations, and wakes up
+	 * everybody who's sleeping on log reservations and tells
+	 * them the bad news.
+	 */
+	if (xfs_log_force_umount(mp, logerror))
+		return;
+
+	if (flags & XFS_CORRUPT_INCORE) {
+		xfs_cmn_err(XFS_PTAG_SHUTDOWN_CORRUPT, CE_ALERT, mp,
+    "Corruption of in-memory data detected.  Shutting down filesystem: %s",
+			mp->m_fsname);
+		if (XFS_ERRLEVEL_HIGH <= xfs_error_level) {
+			xfs_stack_trace();
+		}
+	} else if (!(flags & XFS_FORCE_UMOUNT)) {
+		if (logerror) {
+			xfs_cmn_err(XFS_PTAG_SHUTDOWN_LOGERROR, CE_ALERT, mp,
+			"Log I/O Error Detected.  Shutting down filesystem: %s",
+				mp->m_fsname);
+		} else if (!(flags & XFS_SHUTDOWN_REMOTE_REQ)) {
+			xfs_cmn_err(XFS_PTAG_SHUTDOWN_IOERROR, CE_ALERT, mp,
+				"I/O Error Detected.  Shutting down filesystem: %s",
+				mp->m_fsname);
+		}
+	}
+	if (!(flags & XFS_FORCE_UMOUNT)) {
+		cmn_err(CE_ALERT,
+		"Please umount the filesystem, and rectify the problem(s)");
+	}
+}
+
+
+/*
+ * Called when we want to stop a buffer from getting written or read.
+ * We attach the EIO error, muck with its flags, and call biodone
+ * so that the proper iodone callbacks get called.
+ */
+int
+xfs_bioerror(
+	xfs_buf_t *bp)
+{
+
+#ifdef XFSERRORDEBUG
+	ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone);
+#endif
+
+	/*
+	 * No need to wait until the buffer is unpinned.
+	 * We aren't flushing it.
+	 */
+	xfs_buftrace("XFS IOERROR", bp);
+	XFS_BUF_ERROR(bp, EIO);
+	/*
+	 * We're calling biodone, so delete B_DONE flag. Either way
+	 * we have to call the iodone callback, and calling biodone
+	 * probably is the best way since it takes care of
+	 * GRIO as well.
+	 */
+	XFS_BUF_UNREAD(bp);
+	XFS_BUF_UNDELAYWRITE(bp);
+	XFS_BUF_UNDONE(bp);
+	XFS_BUF_STALE(bp);
+
+	XFS_BUF_CLR_BDSTRAT_FUNC(bp);
+	xfs_biodone(bp);
+
+	return (EIO);
+}
+
+/*
+ * Same as xfs_bioerror, except that we are releasing the buffer
+ * here ourselves, and avoiding the biodone call.
+ * This is meant for userdata errors; metadata bufs come with
+ * iodone functions attached, so that we can track down errors.
+ */
+int
+xfs_bioerror_relse(
+	xfs_buf_t *bp)
+{
+	int64_t fl;
+
+	ASSERT(XFS_BUF_IODONE_FUNC(bp) != xfs_buf_iodone_callbacks);
+	ASSERT(XFS_BUF_IODONE_FUNC(bp) != xlog_iodone);
+
+	xfs_buftrace("XFS IOERRELSE", bp);
+	fl = XFS_BUF_BFLAGS(bp);
+	/*
+	 * No need to wait until the buffer is unpinned.
+	 * We aren't flushing it.
+	 *
+	 * chunkhold expects B_DONE to be set, whether
+	 * we actually finish the I/O or not. We don't want to
+	 * change that interface.
+	 */
+	XFS_BUF_UNREAD(bp);
+	XFS_BUF_UNDELAYWRITE(bp);
+	XFS_BUF_DONE(bp);
+	XFS_BUF_STALE(bp);
+	XFS_BUF_CLR_IODONE_FUNC(bp);
+	XFS_BUF_CLR_BDSTRAT_FUNC(bp);
+	if (!(fl & XFS_B_ASYNC)) {
+		/*
+		 * Mark b_error and B_ERROR _both_.
+		 * Lot's of chunkcache code assumes that.
+		 * There's no reason to mark error for
+		 * ASYNC buffers.
+		 */
+		XFS_BUF_ERROR(bp, EIO);
+		XFS_BUF_V_IODONESEMA(bp);
+	} else {
+		xfs_buf_relse(bp);
+	}
+	return (EIO);
+}
+/*
+ * Prints out an ALERT message about I/O error.
+ */
+void
+xfs_ioerror_alert(
+	char			*func,
+	struct xfs_mount	*mp,
+	xfs_buf_t		*bp,
+	xfs_daddr_t		blkno)
+{
+	cmn_err(CE_ALERT,
+ "I/O error in filesystem (\"%s\") meta-data dev %s block 0x%llx"
+ "       (\"%s\") error %d buf count %u",
+		(!mp || !mp->m_fsname) ? "(fs name not set)" : mp->m_fsname,
+		XFS_BUFTARG_NAME(bp->pb_target),
+		(__uint64_t)blkno,
+		func,
+		XFS_BUF_GETERROR(bp),
+		XFS_BUF_COUNT(bp));
+}
+
+/*
+ * This isn't an absolute requirement, but it is
+ * just a good idea to call xfs_read_buf instead of
+ * directly doing a read_buf call. For one, we shouldn't
+ * be doing this disk read if we are in SHUTDOWN state anyway,
+ * so this stops that from happening. Secondly, this does all
+ * the error checking stuff and the brelse if appropriate for
+ * the caller, so the code can be a little leaner.
+ */
+
+int
+xfs_read_buf(
+	struct xfs_mount *mp,
+	xfs_buftarg_t	 *target,
+	xfs_daddr_t	 blkno,
+	int              len,
+	uint             flags,
+	xfs_buf_t	 **bpp)
+{
+	xfs_buf_t	 *bp;
+	int		 error;
+
+	if (flags)
+		bp = xfs_buf_read_flags(target, blkno, len, flags);
+	else
+		bp = xfs_buf_read(target, blkno, len, flags);
+	if (!bp)
+		return XFS_ERROR(EIO);
+	error = XFS_BUF_GETERROR(bp);
+	if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) {
+		*bpp = bp;
+	} else {
+		*bpp = NULL;
+		if (error) {
+			xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
+		} else {
+			error = XFS_ERROR(EIO);
+		}
+		if (bp) {
+			XFS_BUF_UNDONE(bp);
+			XFS_BUF_UNDELAYWRITE(bp);
+			XFS_BUF_STALE(bp);
+			/*
+			 * brelse clears B_ERROR and b_error
+			 */
+			xfs_buf_relse(bp);
+		}
+	}
+	return (error);
+}
+
+/*
+ * Wrapper around bwrite() so that we can trap
+ * write errors, and act accordingly.
+ */
+int
+xfs_bwrite(
+	struct xfs_mount *mp,
+	struct xfs_buf	 *bp)
+{
+	int	error;
+
+	/*
+	 * XXXsup how does this work for quotas.
+	 */
+	XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb);
+	XFS_BUF_SET_FSPRIVATE3(bp, mp);
+	XFS_BUF_WRITE(bp);
+
+	if ((error = XFS_bwrite(bp))) {
+		ASSERT(mp);
+		/*
+		 * Cannot put a buftrace here since if the buffer is not
+		 * B_HOLD then we will brelse() the buffer before returning
+		 * from bwrite and we could be tracing a buffer that has
+		 * been reused.
+		 */
+		xfs_force_shutdown(mp, XFS_METADATA_IO_ERROR);
+	}
+	return (error);
+}