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26c5295135
i_gen is incremented in directory operations when the directory is changed. It is never read or otherwise used so it should be removed to help reduce the size of the struct xfs_inode. The patch also removes a duplicate logging of the directory inode core. We only need to do this once per transaction so kill the one associated with the i_gen increment. Signed-off-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Niv Sardi <xaiki@sgi.com>
420 lines
11 KiB
C
420 lines
11 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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* Given an array of up to 4 inode pointers, unlock the pointed to inodes.
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* If there are fewer than 4 entries in the array, the empty entries will
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* be at the end and will have NULL pointers in them.
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*/
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STATIC void
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xfs_rename_unlock4(
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xfs_inode_t **i_tab,
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uint lock_mode)
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{
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int i;
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xfs_iunlock(i_tab[0], lock_mode);
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for (i = 1; i < 4; i++) {
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if (i_tab[i] == NULL)
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break;
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/*
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* Watch out for duplicate entries in the table.
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*/
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if (i_tab[i] != i_tab[i-1])
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xfs_iunlock(i_tab[i], lock_mode);
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}
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}
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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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* 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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xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
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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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* 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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* 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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