mirror of https://gitee.com/openkylin/linux.git
395 lines
10 KiB
C
395 lines
10 KiB
C
/*
|
|
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "xfs.h"
|
|
#include "xfs_fs.h"
|
|
#include "xfs_types.h"
|
|
#include "xfs_log.h"
|
|
#include "xfs_inum.h"
|
|
#include "xfs_trans.h"
|
|
#include "xfs_sb.h"
|
|
#include "xfs_ag.h"
|
|
#include "xfs_dir2.h"
|
|
#include "xfs_dmapi.h"
|
|
#include "xfs_mount.h"
|
|
#include "xfs_da_btree.h"
|
|
#include "xfs_bmap_btree.h"
|
|
#include "xfs_dir2_sf.h"
|
|
#include "xfs_attr_sf.h"
|
|
#include "xfs_dinode.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_inode_item.h"
|
|
#include "xfs_bmap.h"
|
|
#include "xfs_error.h"
|
|
#include "xfs_quota.h"
|
|
#include "xfs_utils.h"
|
|
#include "xfs_trans_space.h"
|
|
#include "xfs_vnodeops.h"
|
|
#include "xfs_trace.h"
|
|
|
|
|
|
/*
|
|
* Enter all inodes for a rename transaction into a sorted array.
|
|
*/
|
|
STATIC void
|
|
xfs_sort_for_rename(
|
|
xfs_inode_t *dp1, /* in: old (source) directory inode */
|
|
xfs_inode_t *dp2, /* in: new (target) directory inode */
|
|
xfs_inode_t *ip1, /* in: inode of old entry */
|
|
xfs_inode_t *ip2, /* in: inode of new entry, if it
|
|
already exists, NULL otherwise. */
|
|
xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
|
|
int *num_inodes) /* out: number of inodes in array */
|
|
{
|
|
xfs_inode_t *temp;
|
|
int i, j;
|
|
|
|
/*
|
|
* i_tab contains a list of pointers to inodes. We initialize
|
|
* the table here & we'll sort it. We will then use it to
|
|
* order the acquisition of the inode locks.
|
|
*
|
|
* Note that the table may contain duplicates. e.g., dp1 == dp2.
|
|
*/
|
|
i_tab[0] = dp1;
|
|
i_tab[1] = dp2;
|
|
i_tab[2] = ip1;
|
|
if (ip2) {
|
|
*num_inodes = 4;
|
|
i_tab[3] = ip2;
|
|
} else {
|
|
*num_inodes = 3;
|
|
i_tab[3] = NULL;
|
|
}
|
|
|
|
/*
|
|
* Sort the elements via bubble sort. (Remember, there are at
|
|
* most 4 elements to sort, so this is adequate.)
|
|
*/
|
|
for (i = 0; i < *num_inodes; i++) {
|
|
for (j = 1; j < *num_inodes; j++) {
|
|
if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
|
|
temp = i_tab[j];
|
|
i_tab[j] = i_tab[j-1];
|
|
i_tab[j-1] = temp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* xfs_rename
|
|
*/
|
|
int
|
|
xfs_rename(
|
|
xfs_inode_t *src_dp,
|
|
struct xfs_name *src_name,
|
|
xfs_inode_t *src_ip,
|
|
xfs_inode_t *target_dp,
|
|
struct xfs_name *target_name,
|
|
xfs_inode_t *target_ip)
|
|
{
|
|
xfs_trans_t *tp = NULL;
|
|
xfs_mount_t *mp = src_dp->i_mount;
|
|
int new_parent; /* moving to a new dir */
|
|
int src_is_directory; /* src_name is a directory */
|
|
int error;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_fsblock_t first_block;
|
|
int cancel_flags;
|
|
int committed;
|
|
xfs_inode_t *inodes[4];
|
|
int spaceres;
|
|
int num_inodes;
|
|
|
|
xfs_itrace_entry(src_dp);
|
|
xfs_itrace_entry(target_dp);
|
|
|
|
if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) ||
|
|
DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
|
|
error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
|
|
src_dp, DM_RIGHT_NULL,
|
|
target_dp, DM_RIGHT_NULL,
|
|
src_name->name, target_name->name,
|
|
0, 0, 0);
|
|
if (error)
|
|
return error;
|
|
}
|
|
/* Return through std_return after this point. */
|
|
|
|
new_parent = (src_dp != target_dp);
|
|
src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
|
|
|
|
if (src_is_directory) {
|
|
/*
|
|
* Check for link count overflow on target_dp
|
|
*/
|
|
if (target_ip == NULL && new_parent &&
|
|
target_dp->i_d.di_nlink >= XFS_MAXLINK) {
|
|
error = XFS_ERROR(EMLINK);
|
|
goto std_return;
|
|
}
|
|
}
|
|
|
|
xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
|
|
inodes, &num_inodes);
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
|
|
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
|
|
spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
|
|
error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
|
|
if (error == ENOSPC) {
|
|
spaceres = 0;
|
|
error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
|
|
}
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
goto std_return;
|
|
}
|
|
|
|
/*
|
|
* Attach the dquots to the inodes
|
|
*/
|
|
error = xfs_qm_vop_rename_dqattach(inodes);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, cancel_flags);
|
|
goto std_return;
|
|
}
|
|
|
|
/*
|
|
* Lock all the participating inodes. Depending upon whether
|
|
* the target_name exists in the target directory, and
|
|
* whether the target directory is the same as the source
|
|
* directory, we can lock from 2 to 4 inodes.
|
|
*/
|
|
xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* Join all the inodes to the transaction. From this point on,
|
|
* we can rely on either trans_commit or trans_cancel to unlock
|
|
* them. Note that we need to add a vnode reference to the
|
|
* directories since trans_commit & trans_cancel will decrement
|
|
* them when they unlock the inodes. Also, we need to be careful
|
|
* not to add an inode to the transaction more than once.
|
|
*/
|
|
IHOLD(src_dp);
|
|
xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
|
|
|
|
if (new_parent) {
|
|
IHOLD(target_dp);
|
|
xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
IHOLD(src_ip);
|
|
xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
|
|
|
|
if (target_ip) {
|
|
IHOLD(target_ip);
|
|
xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
/*
|
|
* If we are using project inheritance, we only allow renames
|
|
* into our tree when the project IDs are the same; else the
|
|
* tree quota mechanism would be circumvented.
|
|
*/
|
|
if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
|
|
(target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
|
|
error = XFS_ERROR(EXDEV);
|
|
goto error_return;
|
|
}
|
|
|
|
/*
|
|
* Set up the target.
|
|
*/
|
|
if (target_ip == NULL) {
|
|
/*
|
|
* If there's no space reservation, check the entry will
|
|
* fit before actually inserting it.
|
|
*/
|
|
error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
|
|
if (error)
|
|
goto error_return;
|
|
/*
|
|
* If target does not exist and the rename crosses
|
|
* directories, adjust the target directory link count
|
|
* to account for the ".." reference from the new entry.
|
|
*/
|
|
error = xfs_dir_createname(tp, target_dp, target_name,
|
|
src_ip->i_ino, &first_block,
|
|
&free_list, spaceres);
|
|
if (error == ENOSPC)
|
|
goto error_return;
|
|
if (error)
|
|
goto abort_return;
|
|
xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
|
|
if (new_parent && src_is_directory) {
|
|
error = xfs_bumplink(tp, target_dp);
|
|
if (error)
|
|
goto abort_return;
|
|
}
|
|
} else { /* target_ip != NULL */
|
|
/*
|
|
* If target exists and it's a directory, check that both
|
|
* target and source are directories and that target can be
|
|
* destroyed, or that neither is a directory.
|
|
*/
|
|
if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
|
|
/*
|
|
* Make sure target dir is empty.
|
|
*/
|
|
if (!(xfs_dir_isempty(target_ip)) ||
|
|
(target_ip->i_d.di_nlink > 2)) {
|
|
error = XFS_ERROR(EEXIST);
|
|
goto error_return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Link the source inode under the target name.
|
|
* If the source inode is a directory and we are moving
|
|
* it across directories, its ".." entry will be
|
|
* inconsistent until we replace that down below.
|
|
*
|
|
* In case there is already an entry with the same
|
|
* name at the destination directory, remove it first.
|
|
*/
|
|
error = xfs_dir_replace(tp, target_dp, target_name,
|
|
src_ip->i_ino,
|
|
&first_block, &free_list, spaceres);
|
|
if (error)
|
|
goto abort_return;
|
|
xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
|
|
/*
|
|
* Decrement the link count on the target since the target
|
|
* dir no longer points to it.
|
|
*/
|
|
error = xfs_droplink(tp, target_ip);
|
|
if (error)
|
|
goto abort_return;
|
|
|
|
if (src_is_directory) {
|
|
/*
|
|
* Drop the link from the old "." entry.
|
|
*/
|
|
error = xfs_droplink(tp, target_ip);
|
|
if (error)
|
|
goto abort_return;
|
|
}
|
|
} /* target_ip != NULL */
|
|
|
|
/*
|
|
* Remove the source.
|
|
*/
|
|
if (new_parent && src_is_directory) {
|
|
/*
|
|
* Rewrite the ".." entry to point to the new
|
|
* directory.
|
|
*/
|
|
error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
|
|
target_dp->i_ino,
|
|
&first_block, &free_list, spaceres);
|
|
ASSERT(error != EEXIST);
|
|
if (error)
|
|
goto abort_return;
|
|
}
|
|
|
|
/*
|
|
* We always want to hit the ctime on the source inode.
|
|
*
|
|
* 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_ip->i_ino,
|
|
&first_block, &free_list, spaceres);
|
|
if (error)
|
|
goto abort_return;
|
|
|
|
xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
|
|
if (new_parent)
|
|
xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
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));
|
|
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);
|
|
|
|
/* 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_dp, DM_RIGHT_NULL,
|
|
target_dp, DM_RIGHT_NULL,
|
|
src_name->name, target_name->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;
|
|
}
|