1 files changed, 356 insertions, 0 deletions

diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c
new file mode 100644
index 000000000000..d3ff7aef33ba
--- /dev/null
+++ b/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);
+}