622 строки
16 KiB
C
622 строки
16 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_refcache.h"
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#include "xfs_utils.h"
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#include "xfs_trans_space.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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/*
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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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#ifdef DEBUG
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int xfs_rename_skip, xfs_rename_nskip;
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#endif
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/*
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* The following routine will acquire the locks required for a rename
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* operation. The code understands the semantics of renames and will
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* validate that name1 exists under dp1 & that name2 may or may not
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* exist under dp2.
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*
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* We are renaming dp1/name1 to dp2/name2.
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*
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* Return ENOENT if dp1 does not exist, other lookup errors, or 0 for success.
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*/
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STATIC int
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xfs_lock_for_rename(
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xfs_inode_t *dp1, /* old (source) directory inode */
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xfs_inode_t *dp2, /* new (target) directory inode */
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bhv_vname_t *vname1,/* old entry name */
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bhv_vname_t *vname2,/* new entry name */
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xfs_inode_t **ipp1, /* inode of old entry */
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xfs_inode_t **ipp2, /* inode of new entry, if it
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already exists, NULL otherwise. */
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xfs_inode_t **i_tab,/* array of inode returned, sorted */
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int *num_inodes) /* number of inodes in array */
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{
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xfs_inode_t *ip1, *ip2, *temp;
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xfs_ino_t inum1, inum2;
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int error;
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int i, j;
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uint lock_mode;
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int diff_dirs = (dp1 != dp2);
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ip2 = NULL;
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/*
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* First, find out the current inums of the entries so that we
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* can determine the initial locking order. We'll have to
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* sanity check stuff after all the locks have been acquired
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* to see if we still have the right inodes, directories, etc.
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*/
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lock_mode = xfs_ilock_map_shared(dp1);
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error = xfs_get_dir_entry(vname1, &ip1);
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if (error) {
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xfs_iunlock_map_shared(dp1, lock_mode);
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return error;
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}
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inum1 = ip1->i_ino;
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ASSERT(ip1);
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ITRACE(ip1);
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/*
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* Unlock dp1 and lock dp2 if they are different.
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*/
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if (diff_dirs) {
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xfs_iunlock_map_shared(dp1, lock_mode);
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lock_mode = xfs_ilock_map_shared(dp2);
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}
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error = xfs_dir_lookup_int(dp2, lock_mode, vname2, &inum2, &ip2);
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if (error == ENOENT) { /* target does not need to exist. */
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inum2 = 0;
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} else if (error) {
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/*
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* If dp2 and dp1 are the same, the next line unlocks dp1.
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* Got it?
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*/
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xfs_iunlock_map_shared(dp2, lock_mode);
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IRELE (ip1);
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return error;
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} else {
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ITRACE(ip2);
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}
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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 (inum2 == 0) {
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*num_inodes = 3;
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i_tab[3] = NULL;
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} else {
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*num_inodes = 4;
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i_tab[3] = ip2;
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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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* We have dp2 locked. If it isn't first, unlock it.
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* If it is first, tell xfs_lock_inodes so it can skip it
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* when locking. if dp1 == dp2, xfs_lock_inodes will skip both
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* since they are equal. xfs_lock_inodes needs all these inodes
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* so that it can unlock and retry if there might be a dead-lock
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* potential with the log.
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*/
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if (i_tab[0] == dp2 && lock_mode == XFS_ILOCK_SHARED) {
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#ifdef DEBUG
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xfs_rename_skip++;
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#endif
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xfs_lock_inodes(i_tab, *num_inodes, 1, XFS_ILOCK_SHARED);
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} else {
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#ifdef DEBUG
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xfs_rename_nskip++;
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#endif
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xfs_iunlock_map_shared(dp2, lock_mode);
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xfs_lock_inodes(i_tab, *num_inodes, 0, XFS_ILOCK_SHARED);
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}
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/*
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* Set the return value. Null out any unused entries in i_tab.
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*/
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*ipp1 = *ipp2 = NULL;
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for (i=0; i < *num_inodes; i++) {
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if (i_tab[i]->i_ino == inum1) {
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*ipp1 = i_tab[i];
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}
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if (i_tab[i]->i_ino == inum2) {
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*ipp2 = i_tab[i];
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}
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}
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for (;i < 4; i++) {
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i_tab[i] = NULL;
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}
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return 0;
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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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bhv_vname_t *src_vname,
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bhv_vnode_t *target_dir_vp,
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bhv_vname_t *target_vname)
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{
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bhv_vnode_t *src_dir_vp = XFS_ITOV(src_dp);
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xfs_trans_t *tp;
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xfs_inode_t *target_dp, *src_ip, *target_ip;
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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 target_ip_dropped = 0; /* dropped target_ip link? */
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int spaceres;
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int target_link_zero = 0;
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int num_inodes;
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char *src_name = VNAME(src_vname);
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char *target_name = VNAME(target_vname);
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int src_namelen = VNAMELEN(src_vname);
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int target_namelen = VNAMELEN(target_vname);
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vn_trace_entry(src_dp, "xfs_rename", (inst_t *)__return_address);
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vn_trace_entry(xfs_vtoi(target_dir_vp), "xfs_rename", (inst_t *)__return_address);
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/*
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* Find the XFS behavior descriptor for the target directory
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* vnode since it was not handed to us.
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*/
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target_dp = xfs_vtoi(target_dir_vp);
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if (target_dp == NULL) {
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return XFS_ERROR(EXDEV);
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}
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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_dir_vp, DM_RIGHT_NULL,
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target_dir_vp, DM_RIGHT_NULL,
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src_name, target_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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}
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/* Return through std_return after this point. */
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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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* xfs_lock_for_rename() will return ENOENT if src_name
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* does not exist in the source directory.
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*/
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tp = NULL;
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error = xfs_lock_for_rename(src_dp, target_dp, src_vname,
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target_vname, &src_ip, &target_ip, inodes,
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&num_inodes);
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if (error) {
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/*
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* We have nothing locked, no inode references, and
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* no transaction, so just get out.
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*/
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goto std_return;
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}
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ASSERT(src_ip != NULL);
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if ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
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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 && (src_dp != target_dp) &&
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target_dp->i_d.di_nlink >= XFS_MAXLINK) {
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error = XFS_ERROR(EMLINK);
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xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
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goto rele_return;
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}
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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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xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
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goto rele_return;
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}
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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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/*
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* Drop the locks on our inodes so that we can start the transaction.
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*/
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xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
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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_namelen);
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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 rele_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 rele_return;
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}
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/*
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* Reacquire the inode locks we dropped above.
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*/
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xfs_lock_inodes(inodes, num_inodes, 0, 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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VN_HOLD(src_dir_vp);
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xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
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if (new_parent) {
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VN_HOLD(target_dir_vp);
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xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
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}
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if ((src_ip != src_dp) && (src_ip != target_dp)) {
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xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
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}
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if ((target_ip != NULL) &&
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(target_ip != src_ip) &&
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(target_ip != src_dp) &&
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(target_ip != target_dp)) {
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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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if (spaceres == 0 &&
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(error = xfs_dir_canenter(tp, target_dp, target_name,
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target_namelen)))
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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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target_namelen, src_ip->i_ino,
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&first_block, &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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target_namelen, 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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target_ip_dropped = 1;
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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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/* Do this test while we still hold the locks */
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target_link_zero = (target_ip)->i_d.di_nlink==0;
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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, "..", 2, 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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xfs_ichgtime(src_ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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} else {
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/*
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* We always want to hit the ctime on the source inode.
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* We do it in the if clause above for the 'new_parent &&
|
|
* src_is_directory' case, and here we get all the other
|
|
* cases. This isn't strictly required by the standards
|
|
* since the source inode isn't really being changed,
|
|
* but old unix file systems did it and some incremental
|
|
* backup programs won't work without it.
|
|
*/
|
|
xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
|
|
}
|
|
|
|
/*
|
|
* Adjust the link count on src_dp. This is necessary when
|
|
* renaming a directory, either within one parent when
|
|
* the target existed, or across two parent directories.
|
|
*/
|
|
if (src_is_directory && (new_parent || target_ip != NULL)) {
|
|
|
|
/*
|
|
* Decrement link count on src_directory since the
|
|
* entry that's moved no longer points to it.
|
|
*/
|
|
error = xfs_droplink(tp, src_dp);
|
|
if (error)
|
|
goto abort_return;
|
|
}
|
|
|
|
error = xfs_dir_removename(tp, src_dp, src_name, src_namelen,
|
|
src_ip->i_ino, &first_block, &free_list, spaceres);
|
|
if (error)
|
|
goto abort_return;
|
|
xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
|
|
/*
|
|
* Update the generation counts on all the directory inodes
|
|
* that we're modifying.
|
|
*/
|
|
src_dp->i_gen++;
|
|
xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
|
|
|
|
if (new_parent) {
|
|
target_dp->i_gen++;
|
|
xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
|
|
}
|
|
|
|
/*
|
|
* If there was a target inode, take an extra reference on
|
|
* it here so that it doesn't go to xfs_inactive() from
|
|
* within the commit.
|
|
*/
|
|
if (target_ip != NULL) {
|
|
IHOLD(target_ip);
|
|
}
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* rename transaction goes to disk before returning to
|
|
* the user.
|
|
*/
|
|
if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
|
|
xfs_trans_set_sync(tp);
|
|
}
|
|
|
|
/*
|
|
* Take refs. for vop_link_removed calls below. No need to worry
|
|
* about directory refs. because the caller holds them.
|
|
*
|
|
* Do holds before the xfs_bmap_finish since it might rele them down
|
|
* to zero.
|
|
*/
|
|
|
|
if (target_ip_dropped)
|
|
IHOLD(target_ip);
|
|
IHOLD(src_ip);
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error) {
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
|
|
XFS_TRANS_ABORT));
|
|
if (target_ip != NULL) {
|
|
IRELE(target_ip);
|
|
}
|
|
if (target_ip_dropped) {
|
|
IRELE(target_ip);
|
|
}
|
|
IRELE(src_ip);
|
|
goto std_return;
|
|
}
|
|
|
|
/*
|
|
* trans_commit will unlock src_ip, target_ip & decrement
|
|
* the vnode references.
|
|
*/
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (target_ip != NULL) {
|
|
xfs_refcache_purge_ip(target_ip);
|
|
IRELE(target_ip);
|
|
}
|
|
/*
|
|
* Let interposed file systems know about removed links.
|
|
*/
|
|
if (target_ip_dropped)
|
|
IRELE(target_ip);
|
|
|
|
IRELE(src_ip);
|
|
|
|
/* Fall through to std_return with error = 0 or errno from
|
|
* xfs_trans_commit */
|
|
std_return:
|
|
if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) ||
|
|
DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
|
|
(void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
|
|
src_dir_vp, DM_RIGHT_NULL,
|
|
target_dir_vp, DM_RIGHT_NULL,
|
|
src_name, target_name,
|
|
0, error, 0);
|
|
}
|
|
return error;
|
|
|
|
abort_return:
|
|
cancel_flags |= XFS_TRANS_ABORT;
|
|
/* FALLTHROUGH */
|
|
error_return:
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, cancel_flags);
|
|
goto std_return;
|
|
|
|
rele_return:
|
|
IRELE(src_ip);
|
|
if (target_ip != NULL) {
|
|
IRELE(target_ip);
|
|
}
|
|
goto std_return;
|
|
}
|