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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_rw.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/xfs/xfs_rw.c')
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diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c
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+/*
+ * 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);
+}
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