393 lines
10 KiB
C
393 lines
10 KiB
C
/*
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* Copyright (c) 2000-2003,2005 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_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_da_btree.h"
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#include "xfs_bmap_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_error.h"
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#include "xfs_quota.h"
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#include "xfs_utils.h"
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#include "xfs_trans_space.h"
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#include "xfs_vnodeops.h"
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/*
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* Enter all inodes for a rename transaction into a sorted array.
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*/
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STATIC void
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xfs_sort_for_rename(
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xfs_inode_t *dp1, /* in: old (source) directory inode */
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xfs_inode_t *dp2, /* in: new (target) directory inode */
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xfs_inode_t *ip1, /* in: inode of old entry */
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xfs_inode_t *ip2, /* in: inode of new entry, if it
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already exists, NULL otherwise. */
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xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
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int *num_inodes) /* out: number of inodes in array */
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{
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xfs_inode_t *temp;
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int i, j;
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/*
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* i_tab contains a list of pointers to inodes. We initialize
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* the table here & we'll sort it. We will then use it to
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* order the acquisition of the inode locks.
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*
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* Note that the table may contain duplicates. e.g., dp1 == dp2.
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*/
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i_tab[0] = dp1;
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i_tab[1] = dp2;
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i_tab[2] = ip1;
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if (ip2) {
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*num_inodes = 4;
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i_tab[3] = ip2;
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} else {
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*num_inodes = 3;
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i_tab[3] = NULL;
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}
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/*
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* Sort the elements via bubble sort. (Remember, there are at
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* most 4 elements to sort, so this is adequate.)
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*/
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for (i = 0; i < *num_inodes; i++) {
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for (j = 1; j < *num_inodes; j++) {
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if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
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temp = i_tab[j];
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i_tab[j] = i_tab[j-1];
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i_tab[j-1] = temp;
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}
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}
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}
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}
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/*
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* xfs_rename
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*/
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int
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xfs_rename(
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xfs_inode_t *src_dp,
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struct xfs_name *src_name,
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xfs_inode_t *src_ip,
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xfs_inode_t *target_dp,
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struct xfs_name *target_name,
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xfs_inode_t *target_ip)
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{
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xfs_trans_t *tp = NULL;
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xfs_mount_t *mp = src_dp->i_mount;
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int new_parent; /* moving to a new dir */
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int src_is_directory; /* src_name is a directory */
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int error;
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xfs_bmap_free_t free_list;
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xfs_fsblock_t first_block;
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int cancel_flags;
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int committed;
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xfs_inode_t *inodes[4];
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int spaceres;
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int num_inodes;
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xfs_itrace_entry(src_dp);
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xfs_itrace_entry(target_dp);
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if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) ||
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DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
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error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
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src_dp, DM_RIGHT_NULL,
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target_dp, DM_RIGHT_NULL,
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src_name->name, target_name->name,
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0, 0, 0);
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if (error)
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return error;
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}
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/* Return through std_return after this point. */
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new_parent = (src_dp != target_dp);
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src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
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if (src_is_directory) {
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/*
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* Check for link count overflow on target_dp
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*/
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if (target_ip == NULL && new_parent &&
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target_dp->i_d.di_nlink >= XFS_MAXLINK) {
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error = XFS_ERROR(EMLINK);
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goto std_return;
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}
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}
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xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
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inodes, &num_inodes);
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xfs_bmap_init(&free_list, &first_block);
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tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
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cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
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spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
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error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
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XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
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if (error == ENOSPC) {
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spaceres = 0;
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error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
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XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
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}
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if (error) {
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xfs_trans_cancel(tp, 0);
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goto std_return;
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}
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/*
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* Attach the dquots to the inodes
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*/
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if ((error = XFS_QM_DQVOPRENAME(mp, inodes))) {
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xfs_trans_cancel(tp, cancel_flags);
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goto std_return;
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}
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/*
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* Lock all the participating inodes. Depending upon whether
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* the target_name exists in the target directory, and
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* whether the target directory is the same as the source
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* directory, we can lock from 2 to 4 inodes.
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*/
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xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
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/*
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* Join all the inodes to the transaction. From this point on,
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* we can rely on either trans_commit or trans_cancel to unlock
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* them. Note that we need to add a vnode reference to the
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* directories since trans_commit & trans_cancel will decrement
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* them when they unlock the inodes. Also, we need to be careful
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* not to add an inode to the transaction more than once.
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*/
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IHOLD(src_dp);
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xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
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if (new_parent) {
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IHOLD(target_dp);
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xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
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}
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IHOLD(src_ip);
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xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
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if (target_ip) {
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IHOLD(target_ip);
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xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
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}
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/*
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* If we are using project inheritance, we only allow renames
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* into our tree when the project IDs are the same; else the
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* tree quota mechanism would be circumvented.
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*/
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if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
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(target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
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error = XFS_ERROR(EXDEV);
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goto error_return;
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}
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/*
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* Set up the target.
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*/
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if (target_ip == NULL) {
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/*
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* If there's no space reservation, check the entry will
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* fit before actually inserting it.
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*/
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error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
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if (error)
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goto error_return;
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/*
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* If target does not exist and the rename crosses
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* directories, adjust the target directory link count
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* to account for the ".." reference from the new entry.
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*/
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error = xfs_dir_createname(tp, target_dp, target_name,
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src_ip->i_ino, &first_block,
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&free_list, spaceres);
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if (error == ENOSPC)
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goto error_return;
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if (error)
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goto abort_return;
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xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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if (new_parent && src_is_directory) {
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error = xfs_bumplink(tp, target_dp);
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if (error)
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goto abort_return;
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}
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} else { /* target_ip != NULL */
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/*
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* If target exists and it's a directory, check that both
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* target and source are directories and that target can be
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* destroyed, or that neither is a directory.
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*/
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if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
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/*
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* Make sure target dir is empty.
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*/
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if (!(xfs_dir_isempty(target_ip)) ||
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(target_ip->i_d.di_nlink > 2)) {
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error = XFS_ERROR(EEXIST);
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goto error_return;
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}
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}
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/*
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* Link the source inode under the target name.
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* If the source inode is a directory and we are moving
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* it across directories, its ".." entry will be
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* inconsistent until we replace that down below.
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*
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* In case there is already an entry with the same
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* name at the destination directory, remove it first.
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*/
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error = xfs_dir_replace(tp, target_dp, target_name,
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src_ip->i_ino,
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&first_block, &free_list, spaceres);
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if (error)
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goto abort_return;
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xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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/*
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* Decrement the link count on the target since the target
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* dir no longer points to it.
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*/
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error = xfs_droplink(tp, target_ip);
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if (error)
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goto abort_return;
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if (src_is_directory) {
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/*
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* Drop the link from the old "." entry.
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*/
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error = xfs_droplink(tp, target_ip);
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if (error)
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goto abort_return;
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}
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} /* target_ip != NULL */
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/*
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* Remove the source.
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*/
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if (new_parent && src_is_directory) {
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/*
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* Rewrite the ".." entry to point to the new
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* directory.
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*/
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error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
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target_dp->i_ino,
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&first_block, &free_list, spaceres);
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ASSERT(error != EEXIST);
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if (error)
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goto abort_return;
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}
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/*
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* We always want to hit the ctime on the source inode.
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*
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* This isn't strictly required by the standards since the source
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* inode isn't really being changed, but old unix file systems did
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* it and some incremental backup programs won't work without it.
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*/
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xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
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/*
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* Adjust the link count on src_dp. This is necessary when
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* renaming a directory, either within one parent when
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* the target existed, or across two parent directories.
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*/
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if (src_is_directory && (new_parent || target_ip != NULL)) {
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/*
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* Decrement link count on src_directory since the
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* entry that's moved no longer points to it.
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*/
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error = xfs_droplink(tp, src_dp);
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if (error)
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goto abort_return;
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}
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error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
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&first_block, &free_list, spaceres);
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if (error)
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goto abort_return;
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xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
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if (new_parent)
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xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
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/*
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* If this is a synchronous mount, make sure that the
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* rename transaction goes to disk before returning to
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* the user.
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*/
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if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
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xfs_trans_set_sync(tp);
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}
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error = xfs_bmap_finish(&tp, &free_list, &committed);
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if (error) {
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xfs_bmap_cancel(&free_list);
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xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
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XFS_TRANS_ABORT));
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goto std_return;
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}
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/*
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* trans_commit will unlock src_ip, target_ip & decrement
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* the vnode references.
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*/
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error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
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/* Fall through to std_return with error = 0 or errno from
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* xfs_trans_commit */
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std_return:
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if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) ||
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DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
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(void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
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src_dp, DM_RIGHT_NULL,
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target_dp, DM_RIGHT_NULL,
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src_name->name, target_name->name,
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0, error, 0);
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}
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return error;
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abort_return:
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cancel_flags |= XFS_TRANS_ABORT;
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/* FALLTHROUGH */
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error_return:
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xfs_bmap_cancel(&free_list);
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xfs_trans_cancel(tp, cancel_flags);
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goto std_return;
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}
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