e1cccd917b
When multiple inodes are locked in XFS it happens in order of the inode number, with the everything but the first inode trylocked if any of the previous inodes is in the AIL. Except for the sorting of the inodes this logic is implemented in xfs_lock_inodes, but also partially duplicated in xfs_lock_dir_and_entry in a particularly stupid way adds a lock roundtrip if the inode ordering is not optimal. This patch adds a new helper xfs_lock_two_inodes that takes two inodes and locks them in the most optimal way according to the above locking protocol and uses it for all places that want to lock two inodes. The only caller of xfs_lock_inodes is xfs_rename which might lock up to four inodes. SGI-PV: 981498 SGI-Modid: xfs-linux-melb:xfs-kern:31772a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Donald Douwsma <donaldd@sgi.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
373 lines
8.8 KiB
C
373 lines
8.8 KiB
C
/*
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* Copyright (c) 2000-2006 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_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_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_rw.h"
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#include "xfs_vnodeops.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, *tip;
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struct file *file, *target_file;
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int error = 0;
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sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
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if (!sxp) {
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error = XFS_ERROR(ENOMEM);
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goto out;
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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 out_free_sxp;
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}
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/* Pull information for the target fd */
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file = fget((int)sxp->sx_fdtarget);
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if (!file) {
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error = XFS_ERROR(EINVAL);
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goto out_free_sxp;
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}
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if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) {
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error = XFS_ERROR(EBADF);
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goto out_put_file;
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}
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target_file = fget((int)sxp->sx_fdtmp);
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if (!target_file) {
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error = XFS_ERROR(EINVAL);
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goto out_put_file;
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}
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if (!(target_file->f_mode & FMODE_WRITE) ||
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(target_file->f_flags & O_APPEND)) {
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error = XFS_ERROR(EBADF);
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goto out_put_target_file;
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}
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ip = XFS_I(file->f_path.dentry->d_inode);
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tip = XFS_I(target_file->f_path.dentry->d_inode);
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if (ip->i_mount != tip->i_mount) {
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error = XFS_ERROR(EINVAL);
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goto out_put_target_file;
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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 out_put_target_file;
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}
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if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
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error = XFS_ERROR(EIO);
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goto out_put_target_file;
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}
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error = xfs_swap_extents(ip, tip, sxp);
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out_put_target_file:
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fput(target_file);
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out_put_file:
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fput(file);
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out_free_sxp:
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kmem_free(sxp);
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out:
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return error;
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}
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int
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xfs_swap_extents(
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xfs_inode_t *ip,
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xfs_inode_t *tip,
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xfs_swapext_t *sxp)
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{
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xfs_mount_t *mp;
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xfs_trans_t *tp;
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xfs_bstat_t *sbp = &sxp->sx_stat;
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bhv_vnode_t *vp, *tvp;
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xfs_ifork_t *tempifp, *ifp, *tifp;
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int ilf_fields, tilf_fields;
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static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
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int error = 0;
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int aforkblks = 0;
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int taforkblks = 0;
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__uint64_t tmp;
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char locked = 0;
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mp = ip->i_mount;
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tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
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if (!tempifp) {
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error = XFS_ERROR(ENOMEM);
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goto error0;
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}
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sbp = &sxp->sx_stat;
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vp = VFS_I(ip);
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tvp = VFS_I(tip);
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xfs_lock_two_inodes(ip, tip, lock_flags);
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locked = 1;
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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 (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
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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, 0, -1, 0, -1);
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error = xfs_flushinval_pages(tip, 0, -1,
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FI_REMAPF_LOCKED);
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if (error)
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goto error0;
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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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xfs_tosspages(ip, 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_two_inodes(ip, tip, 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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IHOLD(ip);
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xfs_trans_ijoin(tp, ip, lock_flags);
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IHOLD(tip);
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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);
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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 (tempifp != NULL)
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kmem_free(tempifp);
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return error;
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}
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