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

• Lines: 386
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_dfrag.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_dfrag.c linux-2.4.25/fs/xfs/xfs_dfrag.c
@@ -0,0 +1,385 @@
+/*
+ * Copyright (c) 2000-2002 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_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_ag.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.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_ialloc.h"
+#include "xfs_itable.h"
+#include "xfs_dfrag.h"
+#include "xfs_error.h"
+#include "xfs_mac.h"
+#include "xfs_rw.h"
+
+/*
+ * Syssgi interface for swapext
+ */
+int
+xfs_swapext(
+	xfs_swapext_t   *sxp)
+{
+	xfs_swapext_t	sx;
+	xfs_inode_t     *ip=NULL, *tip=NULL, *ips[2];
+	xfs_trans_t     *tp;
+	xfs_mount_t     *mp;
+	xfs_bstat_t	*sbp;
+	struct file	*fp = NULL, *tfp = NULL;
+	vnode_t		*vp, *tvp;
+	bhv_desc_t      *bdp, *tbdp;
+	vn_bhv_head_t   *bhp, *tbhp;
+	uint		lock_flags=0;
+	int		ilf_fields, tilf_fields;
+	int		error = 0;
+	xfs_ifork_t	tempif, *ifp, *tifp;
+	__uint64_t	tmp;
+	int		aforkblks = 0;
+	int		taforkblks = 0;
+	int		locked = 0;
+
+	if (copy_from_user(&sx, sxp, sizeof(sx)))
+		return XFS_ERROR(EFAULT);
+
+	/* Pull information for the target fd */
+	if (((fp = fget((int)sx.sx_fdtarget)) == NULL) ||
+	    ((vp = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL))  {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	bhp = VN_BHV_HEAD(vp);
+	bdp = vn_bhv_lookup(bhp, &xfs_vnodeops);
+	if (bdp == NULL) {
+		error = XFS_ERROR(EBADF);
+		goto error0;
+	} else {
+		ip = XFS_BHVTOI(bdp);
+	}
+
+	if (((tfp = fget((int)sx.sx_fdtmp)) == NULL) ||
+	    ((tvp = LINVFS_GET_VP(tfp->f_dentry->d_inode)) == NULL)) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	tbhp = VN_BHV_HEAD(tvp);
+	tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops);
+	if (tbdp == NULL) {
+		error = XFS_ERROR(EBADF);
+		goto error0;
+	} else {
+		tip = XFS_BHVTOI(tbdp);
+	}
+
+	if (ip->i_ino == tip->i_ino) {
+		error =  XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	mp = ip->i_mount;
+
+	sbp = &sx.sx_stat;
+
+	if (XFS_FORCED_SHUTDOWN(mp)) {
+		error =  XFS_ERROR(EIO);
+		goto error0;
+	}
+
+	locked = 1;
+
+	/* Lock in i_ino order */
+	if (ip->i_ino < tip->i_ino) {
+		ips[0] = ip;
+		ips[1] = tip;
+	} else {
+		ips[0] = tip;
+		ips[1] = ip;
+	}
+	lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
+	xfs_lock_inodes(ips, 2, 0, lock_flags);
+
+	/* Check permissions */
+	if ((error = _MAC_XFS_IACCESS(ip, MACWRITE, NULL))) {
+		goto error0;
+	}
+	if ((error = _MAC_XFS_IACCESS(tip, MACWRITE, NULL))) {
+		goto error0;
+	}
+	if ((current_fsuid(cred) != ip->i_d.di_uid) &&
+	    (error = xfs_iaccess(ip, S_IWUSR, NULL)) &&
+	    !capable_cred(NULL, CAP_FOWNER)) {
+		goto error0;
+	}
+	if ((current_fsuid(cred) != tip->i_d.di_uid) &&
+	    (error = xfs_iaccess(tip, S_IWUSR, NULL)) &&
+	    !capable_cred(NULL, CAP_FOWNER)) {
+		goto error0;
+	}
+
+	/* Verify both files are either real-time or non-realtime */
+	if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
+	    (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	/* Should never get a local format */
+	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
+	    tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	if (VN_CACHED(tvp) != 0)
+		xfs_inval_cached_pages(XFS_ITOV(tip), &(tip->i_iocore),
+						(loff_t)0, 0, 0);
+
+	/* Verify O_DIRECT for ftmp */
+	if (VN_CACHED(tvp) != 0) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	/* Verify all data are being swapped */
+	if (sx.sx_offset != 0 ||
+	    sx.sx_length != ip->i_d.di_size ||
+	    sx.sx_length != tip->i_d.di_size) {
+		error = XFS_ERROR(EFAULT);
+		goto error0;
+	}
+
+	/*
+	 * If the target has extended attributes, the tmp file
+	 * must also in order to ensure the correct data fork
+	 * format.
+	 */
+	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	/*
+	 * Compare the current change & modify times with that
+	 * passed in.  If they differ, we abort this swap.
+	 * This is the mechanism used to ensure the calling
+	 * process that the file was not changed out from
+	 * under it.
+	 */
+	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
+	    (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
+	    (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
+	    (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
+		error = XFS_ERROR(EBUSY);
+		goto error0;
+	}
+
+	/* We need to fail if the file is memory mapped.  Once we have tossed
+	 * all existing pages, the page fault will have no option
+	 * but to go to the filesystem for pages. By making the page fault call
+	 * VOP_READ (or write in the case of autogrow) they block on the iolock
+	 * until we have switched the extents.
+	 */
+	if (VN_MAPPED(vp)) {
+		error = XFS_ERROR(EBUSY);
+		goto error0;
+	}
+
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	xfs_iunlock(tip, XFS_ILOCK_EXCL);
+
+	/*
+	 * There is a race condition here since we gave up the
+	 * ilock.  However, the data fork will not change since
+	 * we have the iolock (locked for truncation too) so we
+	 * are safe.  We don't really care if non-io related
+	 * fields change.
+	 */
+
+	VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
+
+	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
+	if ((error = xfs_trans_reserve(tp, 0,
+				     XFS_ICHANGE_LOG_RES(mp), 0,
+				     0, 0))) {
+		xfs_iunlock(ip,  XFS_IOLOCK_EXCL);
+		xfs_iunlock(tip, XFS_IOLOCK_EXCL);
+		xfs_trans_cancel(tp, 0);
+		return error;
+	}
+	xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
+
+	/*
+	 * Count the number of extended attribute blocks
+	 */
+	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
+	     (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
+		error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
+		if (error) {
+			xfs_iunlock(ip,  lock_flags);
+			xfs_iunlock(tip, lock_flags);
+			xfs_trans_cancel(tp, 0);
+			return error;
+		}
+	}
+	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
+	     (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
+		error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
+			&taforkblks);
+		if (error) {
+			xfs_iunlock(ip,  lock_flags);
+			xfs_iunlock(tip, lock_flags);
+			xfs_trans_cancel(tp, 0);
+			return error;
+		}
+	}
+
+	/*
+	 * Swap the data forks of the inodes
+	 */
+	ifp = &ip->i_df;
+	tifp = &tip->i_df;
+	tempif = *ifp;	/* struct copy */
+	*ifp = *tifp;	/* struct copy */
+	*tifp = tempif;	/* struct copy */
+
+	/*
+	 * Fix the on-disk inode values
+	 */
+	tmp = (__uint64_t)ip->i_d.di_nblocks;
+	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
+	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
+
+	tmp = (__uint64_t) ip->i_d.di_nextents;
+	ip->i_d.di_nextents = tip->i_d.di_nextents;
+	tip->i_d.di_nextents = tmp;
+
+	tmp = (__uint64_t) ip->i_d.di_format;
+	ip->i_d.di_format = tip->i_d.di_format;
+	tip->i_d.di_format = tmp;
+
+	ilf_fields = XFS_ILOG_CORE;
+
+	switch(ip->i_d.di_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		/* If the extents fit in the inode, fix the
+		 * pointer.  Otherwise it's already NULL or
+		 * pointing to the extent.
+		 */
+		if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
+			ifp->if_u1.if_extents =
+				ifp->if_u2.if_inline_ext;
+		}
+		ilf_fields |= XFS_ILOG_DEXT;
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		ilf_fields |= XFS_ILOG_DBROOT;
+		break;
+	}
+
+	tilf_fields = XFS_ILOG_CORE;
+
+	switch(tip->i_d.di_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		/* If the extents fit in the inode, fix the
+		 * pointer.  Otherwise it's already NULL or
+		 * pointing to the extent.
+		 */
+		if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
+			tifp->if_u1.if_extents =
+				tifp->if_u2.if_inline_ext;
+		}
+		tilf_fields |= XFS_ILOG_DEXT;
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		tilf_fields |= XFS_ILOG_DBROOT;
+		break;
+	}
+
+	/*
+	 * Increment vnode ref counts since xfs_trans_commit &
+	 * xfs_trans_cancel will both unlock the inodes and
+	 * decrement the associated ref counts.
+	 */
+	VN_HOLD(vp);
+	VN_HOLD(tvp);
+
+	xfs_trans_ijoin(tp, ip, lock_flags);
+	xfs_trans_ijoin(tp, tip, lock_flags);
+
+	xfs_trans_log_inode(tp, ip,  ilf_fields);
+	xfs_trans_log_inode(tp, tip, tilf_fields);
+
+	/*
+	 * If this is a synchronous mount, make sure that the
+	 * transaction goes to disk before returning to the user.
+	 */
+	if (mp->m_flags & XFS_MOUNT_WSYNC) {
+		xfs_trans_set_sync(tp);
+	}
+
+	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL);
+
+	fput(fp);
+	fput(tfp);
+
+	return error;
+
+ error0:
+	if (locked) {
+		xfs_iunlock(ip,  lock_flags);
+		xfs_iunlock(tip, lock_flags);
+	}
+
+	if (fp != NULL) fput(fp);
+	if (tfp != NULL) fput(tfp);
+
+	return error;
+}