2 * Copyright (c) Björn Jacke 2010
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include "smbd/smbd.h"
20 #include "system/filesys.h"
21 #include "transfer_file.h"
22 #include "smbprofile.h"
24 #define MODULE "crossrename"
25 static SMB_OFF_T module_sizelimit;
27 static int crossrename_connect(
28 struct vfs_handle_struct * handle,
32 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
38 module_sizelimit = (SMB_OFF_T) lp_parm_int(SNUM(handle->conn),
39 MODULE, "sizelimit", 20);
40 /* convert from MiB to byte: */
41 module_sizelimit *= 1048576;
46 /*********************************************************
47 For rename across filesystems initial Patch from Warren Birnbaum
48 <warrenb@hpcvscdp.cv.hp.com>
49 **********************************************************/
51 static int copy_reg(const char *source, const char *dest)
53 SMB_STRUCT_STAT source_stats;
58 if (sys_lstat(source, &source_stats, false) == -1)
61 if (!S_ISREG (source_stats.st_ex_mode))
64 if (source_stats.st_ex_size > module_sizelimit) {
66 ("%s: size of %s larger than sizelimit (%lld > %lld), rename prohititted\n",
68 (long long)source_stats.st_ex_size,
69 (long long)module_sizelimit));
73 if((ifd = sys_open (source, O_RDONLY, 0)) < 0)
76 if (unlink (dest) && errno != ENOENT)
80 if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0600)) < 0 )
82 if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC , 0600)) < 0 )
86 if (transfer_file(ifd, ofd, source_stats.st_ex_size) == -1)
90 * Try to preserve ownership. For non-root it might fail, but that's ok.
91 * But root probably wants to know, e.g. if NFS disallows it.
95 if ((fchown(ofd, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
97 if ((chown(dest, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
102 * fchown turns off set[ug]id bits for non-root,
103 * so do the chmod last.
106 #if defined(HAVE_FCHMOD)
107 if (fchmod (ofd, source_stats.st_ex_mode & 07777))
109 if (chmod (dest, source_stats.st_ex_mode & 07777))
113 if (close (ifd) == -1)
116 if (close (ofd) == -1)
119 /* Try to copy the old file's modtime and access time. */
120 #if defined(HAVE_UTIMENSAT)
122 struct timespec ts[2];
124 ts[0] = source_stats.st_ex_atime;
125 ts[1] = source_stats.st_ex_mtime;
126 utimensat(AT_FDCWD, dest, ts, AT_SYMLINK_NOFOLLOW);
128 #elif defined(HAVE_UTIMES)
130 struct timeval tv[2];
132 tv[0] = convert_timespec_to_timeval(source_stats.st_ex_atime);
133 tv[1] = convert_timespec_to_timeval(source_stats.st_ex_mtime);
140 #elif defined(HAVE_UTIME)
144 tv.actime = convert_timespec_to_time_t(source_stats.st_ex_atime);
145 tv.modtime = convert_timespec_to_time_t(source_stats.st_ex_mtime);
150 if (unlink (source) == -1)
167 static int crossrename_rename(vfs_handle_struct *handle,
168 const struct smb_filename *smb_fname_src,
169 const struct smb_filename *smb_fname_dst)
173 START_PROFILE(syscall_rename);
175 if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
180 result = rename(smb_fname_src->base_name, smb_fname_dst->base_name);
181 if ((result == -1) && (errno == EXDEV)) {
182 /* Rename across filesystems needed. */
183 result = copy_reg(smb_fname_src->base_name,
184 smb_fname_dst->base_name);
188 END_PROFILE(syscall_rename);
192 static struct vfs_fn_pointers vfs_crossrename_fns = {
193 .connect_fn = crossrename_connect,
194 .rename = crossrename_rename
197 NTSTATUS vfs_crossrename_init(void);
198 NTSTATUS vfs_crossrename_init(void)
200 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE,
201 &vfs_crossrename_fns);