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383 lines
9.2 KiB
383 lines
9.2 KiB
/*
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* Copyright (c) 2000-2002,2005 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_dir.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_dir_sf.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_bmap.h"
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#include "xfs_btree.h"
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#include "xfs_ialloc.h"
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#include "xfs_itable.h"
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#include "xfs_dfrag.h"
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#include "xfs_error.h"
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#include "xfs_mac.h"
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#include "xfs_rw.h"
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/*
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* Syssgi interface for swapext
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*/
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int
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xfs_swapext(
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xfs_swapext_t __user *sxu)
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{
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xfs_swapext_t *sxp;
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xfs_inode_t *ip=NULL, *tip=NULL, *ips[2];
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xfs_trans_t *tp;
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xfs_mount_t *mp;
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xfs_bstat_t *sbp;
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struct file *fp = NULL, *tfp = NULL;
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vnode_t *vp, *tvp;
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bhv_desc_t *bdp, *tbdp;
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vn_bhv_head_t *bhp, *tbhp;
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static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
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int ilf_fields, tilf_fields;
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int error = 0;
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xfs_ifork_t *tempifp, *ifp, *tifp;
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__uint64_t tmp;
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int aforkblks = 0;
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int taforkblks = 0;
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char locked = 0;
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sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
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tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
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if (!sxp || !tempifp) {
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error = XFS_ERROR(ENOMEM);
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goto error0;
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}
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if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
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error = XFS_ERROR(EFAULT);
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goto error0;
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}
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/* Pull information for the target fd */
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if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) ||
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((vp = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL)) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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bhp = VN_BHV_HEAD(vp);
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bdp = vn_bhv_lookup(bhp, &xfs_vnodeops);
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if (bdp == NULL) {
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error = XFS_ERROR(EBADF);
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goto error0;
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} else {
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ip = XFS_BHVTOI(bdp);
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}
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if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) ||
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((tvp = LINVFS_GET_VP(tfp->f_dentry->d_inode)) == NULL)) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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tbhp = VN_BHV_HEAD(tvp);
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tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops);
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if (tbdp == NULL) {
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error = XFS_ERROR(EBADF);
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goto error0;
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} else {
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tip = XFS_BHVTOI(tbdp);
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}
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if (ip->i_mount != tip->i_mount) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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if (ip->i_ino == tip->i_ino) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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mp = ip->i_mount;
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sbp = &sxp->sx_stat;
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if (XFS_FORCED_SHUTDOWN(mp)) {
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error = XFS_ERROR(EIO);
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goto error0;
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}
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locked = 1;
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/* Lock in i_ino order */
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if (ip->i_ino < tip->i_ino) {
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ips[0] = ip;
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ips[1] = tip;
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} else {
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ips[0] = tip;
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ips[1] = ip;
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}
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xfs_lock_inodes(ips, 2, 0, lock_flags);
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/* Check permissions */
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error = xfs_iaccess(ip, S_IWUSR, NULL);
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if (error)
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goto error0;
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error = xfs_iaccess(tip, S_IWUSR, NULL);
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if (error)
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goto error0;
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/* Verify that both files have the same format */
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if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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/* Verify both files are either real-time or non-realtime */
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if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
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(tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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/* Should never get a local format */
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if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
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tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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if (VN_CACHED(tvp) != 0) {
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xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1);
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VOP_FLUSHINVAL_PAGES(tvp, 0, -1, FI_REMAPF_LOCKED);
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}
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/* Verify O_DIRECT for ftmp */
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if (VN_CACHED(tvp) != 0) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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/* Verify all data are being swapped */
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if (sxp->sx_offset != 0 ||
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sxp->sx_length != ip->i_d.di_size ||
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sxp->sx_length != tip->i_d.di_size) {
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error = XFS_ERROR(EFAULT);
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goto error0;
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}
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/*
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* If the target has extended attributes, the tmp file
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* must also in order to ensure the correct data fork
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* format.
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*/
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if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
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error = XFS_ERROR(EINVAL);
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goto error0;
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}
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/*
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* Compare the current change & modify times with that
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* passed in. If they differ, we abort this swap.
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* This is the mechanism used to ensure the calling
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* process that the file was not changed out from
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* under it.
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*/
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if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
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(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
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(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
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(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
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error = XFS_ERROR(EBUSY);
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goto error0;
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}
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/* We need to fail if the file is memory mapped. Once we have tossed
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* all existing pages, the page fault will have no option
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* but to go to the filesystem for pages. By making the page fault call
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* VOP_READ (or write in the case of autogrow) they block on the iolock
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* until we have switched the extents.
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*/
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if (VN_MAPPED(vp)) {
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error = XFS_ERROR(EBUSY);
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goto error0;
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}
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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xfs_iunlock(tip, XFS_ILOCK_EXCL);
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/*
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* There is a race condition here since we gave up the
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* ilock. However, the data fork will not change since
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* we have the iolock (locked for truncation too) so we
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* are safe. We don't really care if non-io related
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* fields change.
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*/
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VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
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tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
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if ((error = xfs_trans_reserve(tp, 0,
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XFS_ICHANGE_LOG_RES(mp), 0,
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0, 0))) {
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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xfs_iunlock(tip, XFS_IOLOCK_EXCL);
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xfs_trans_cancel(tp, 0);
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locked = 0;
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goto error0;
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}
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xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
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/*
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* Count the number of extended attribute blocks
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*/
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if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
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(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
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error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
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if (error) {
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xfs_trans_cancel(tp, 0);
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goto error0;
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}
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}
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if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
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(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
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error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
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&taforkblks);
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if (error) {
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xfs_trans_cancel(tp, 0);
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goto error0;
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}
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}
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/*
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* Swap the data forks of the inodes
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*/
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ifp = &ip->i_df;
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tifp = &tip->i_df;
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*tempifp = *ifp; /* struct copy */
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*ifp = *tifp; /* struct copy */
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*tifp = *tempifp; /* struct copy */
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/*
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* Fix the on-disk inode values
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*/
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tmp = (__uint64_t)ip->i_d.di_nblocks;
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ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
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tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
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tmp = (__uint64_t) ip->i_d.di_nextents;
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ip->i_d.di_nextents = tip->i_d.di_nextents;
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tip->i_d.di_nextents = tmp;
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tmp = (__uint64_t) ip->i_d.di_format;
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ip->i_d.di_format = tip->i_d.di_format;
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tip->i_d.di_format = tmp;
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ilf_fields = XFS_ILOG_CORE;
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switch(ip->i_d.di_format) {
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case XFS_DINODE_FMT_EXTENTS:
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/* If the extents fit in the inode, fix the
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* pointer. Otherwise it's already NULL or
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* pointing to the extent.
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*/
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if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
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ifp->if_u1.if_extents =
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ifp->if_u2.if_inline_ext;
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}
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ilf_fields |= XFS_ILOG_DEXT;
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break;
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case XFS_DINODE_FMT_BTREE:
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ilf_fields |= XFS_ILOG_DBROOT;
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break;
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}
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tilf_fields = XFS_ILOG_CORE;
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switch(tip->i_d.di_format) {
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case XFS_DINODE_FMT_EXTENTS:
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/* If the extents fit in the inode, fix the
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* pointer. Otherwise it's already NULL or
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* pointing to the extent.
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*/
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if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
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tifp->if_u1.if_extents =
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tifp->if_u2.if_inline_ext;
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}
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tilf_fields |= XFS_ILOG_DEXT;
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break;
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case XFS_DINODE_FMT_BTREE:
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tilf_fields |= XFS_ILOG_DBROOT;
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break;
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}
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/*
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* Increment vnode ref counts since xfs_trans_commit &
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* xfs_trans_cancel will both unlock the inodes and
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* decrement the associated ref counts.
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*/
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VN_HOLD(vp);
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VN_HOLD(tvp);
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xfs_trans_ijoin(tp, ip, lock_flags);
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xfs_trans_ijoin(tp, tip, lock_flags);
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xfs_trans_log_inode(tp, ip, ilf_fields);
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xfs_trans_log_inode(tp, tip, tilf_fields);
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/*
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* If this is a synchronous mount, make sure that the
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* transaction goes to disk before returning to the user.
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*/
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if (mp->m_flags & XFS_MOUNT_WSYNC) {
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xfs_trans_set_sync(tp);
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}
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error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL);
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locked = 0;
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error0:
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if (locked) {
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xfs_iunlock(ip, lock_flags);
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xfs_iunlock(tip, lock_flags);
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}
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if (fp != NULL)
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fput(fp);
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if (tfp != NULL)
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fput(tfp);
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if (sxp != NULL)
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kmem_free(sxp, sizeof(xfs_swapext_t));
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if (tempifp != NULL)
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kmem_free(tempifp, sizeof(xfs_ifork_t));
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return error;
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}
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