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![Christoph Hellwig](/assets/img/avatar_default.png)
There is no reason to keep a reference to the inode even if we unlock it during transaction commit because we never drop a reference between the ijoin and commit. Also use this fact to merge xfs_trans_ijoin_ref back into xfs_trans_ijoin - the third argument decides if an unlock is needed now. I'm actually starting to wonder if allowing inodes to be unlocked at transaction commit really is worth the effort. The only real benefit is that they can be unlocked earlier when commiting a synchronous transactions, but that could be solved by doing the log force manually after the unlock, too. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
358 lines
9.4 KiB
C
358 lines
9.4 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_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_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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#include "xfs_trace.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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trace_xfs_rename(src_dp, target_dp, src_name, target_name);
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new_parent = (src_dp != target_dp);
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src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
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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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error = xfs_qm_vop_rename_dqattach(inodes);
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if (error) {
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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.
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*/
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xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
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if (new_parent)
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xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
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if (target_ip)
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xfs_trans_ijoin(tp, target_ip, 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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(xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
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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_trans_ichgtime(tp, target_dp,
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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 (S_ISDIR(target_ip->i_d.di_mode)) {
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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_trans_ichgtime(tp, target_dp,
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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_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
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xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);
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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_trans_ichgtime(tp, 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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return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
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abort_return:
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cancel_flags |= XFS_TRANS_ABORT;
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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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std_return:
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return error;
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}
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