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authorBjörn Jacke <bj@sernet.de>2010-03-08 12:59:40 +0100
committerBjörn Jacke <bj@sernet.de>2010-03-08 17:17:58 +0100
commit0769a1833aff2057e7f6ab05713d7fd6886d6040 (patch)
tree1bb99b1d79b647751cde25ccbe3d13c347b980e6 /source3/modules
parent583de7b582956d3bec7e875d88ef16b3b8ac6e53 (diff)
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s3: add vfs_crossrename
this module adds optional server-side support for limited rename operations beyond filesystem boundaries, which was the previously the default.
Diffstat (limited to 'source3/modules')
-rw-r--r--source3/modules/vfs_crossrename.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/source3/modules/vfs_crossrename.c b/source3/modules/vfs_crossrename.c
new file mode 100644
index 0000000000..323ceb120b
--- /dev/null
+++ b/source3/modules/vfs_crossrename.c
@@ -0,0 +1,200 @@
+/*
+ * Copyright (c) Björn Jacke 2010
+ *
+ * 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; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+
+
+#define MODULE "crossrename"
+static SMB_OFF_T module_sizelimit;
+
+static int crossrename_connect(
+ struct vfs_handle_struct * handle,
+ const char * service,
+ const char * user)
+{
+ int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
+
+ if (ret < 0) {
+ return ret;
+ }
+
+ module_sizelimit = (SMB_OFF_T) lp_parm_int(SNUM(handle->conn),
+ MODULE, "sizelimit", 20);
+ /* convert from MiB to byte: */
+ module_sizelimit *= 1048576;
+
+ return 0;
+}
+
+/*********************************************************
+ For rename across filesystems initial Patch from Warren Birnbaum
+ <warrenb@hpcvscdp.cv.hp.com>
+**********************************************************/
+
+static int copy_reg(const char *source, const char *dest)
+{
+ SMB_STRUCT_STAT source_stats;
+ int saved_errno;
+ int ifd = -1;
+ int ofd = -1;
+
+ if (sys_lstat(source, &source_stats, false) == -1)
+ return -1;
+
+ if (!S_ISREG (source_stats.st_ex_mode))
+ return -1;
+
+ if (source_stats.st_ex_size > module_sizelimit) {
+ DEBUG(5,
+ ("%s: size of %s larger than sizelimit (%lld > %lld), rename prohititted\n",
+ MODULE, source,
+ (long long)source_stats.st_ex_size,
+ (long long)module_sizelimit));
+ return -1;
+ }
+
+ if((ifd = sys_open (source, O_RDONLY, 0)) < 0)
+ return -1;
+
+ if (unlink (dest) && errno != ENOENT)
+ return -1;
+
+#ifdef O_NOFOLLOW
+ if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0600)) < 0 )
+#else
+ if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC , 0600)) < 0 )
+#endif
+ goto err;
+
+ if (transfer_file(ifd, ofd, (size_t)-1) == -1)
+ goto err;
+
+ /*
+ * Try to preserve ownership. For non-root it might fail, but that's ok.
+ * But root probably wants to know, e.g. if NFS disallows it.
+ */
+
+#ifdef HAVE_FCHOWN
+ if ((fchown(ofd, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
+#else
+ if ((chown(dest, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
+#endif
+ goto err;
+
+ /*
+ * fchown turns off set[ug]id bits for non-root,
+ * so do the chmod last.
+ */
+
+#if defined(HAVE_FCHMOD)
+ if (fchmod (ofd, source_stats.st_ex_mode & 07777))
+#else
+ if (chmod (dest, source_stats.st_ex_mode & 07777))
+#endif
+ goto err;
+
+ if (close (ifd) == -1)
+ goto err;
+
+ if (close (ofd) == -1)
+ return -1;
+
+ /* Try to copy the old file's modtime and access time. */
+#if defined(HAVE_UTIMENSAT)
+ {
+ struct timespec ts[2];
+
+ ts[0] = source_stats.st_ex_atime;
+ ts[1] = source_stats.st_ex_mtime;
+ utimensat(AT_FDCWD, dest, ts, AT_SYMLINK_NOFOLLOW);
+ }
+#elif defined(HAVE_UTIMES)
+ {
+ struct timeval tv[2];
+
+ tv[0] = convert_timespec_to_timeval(source_stats.st_ex_atime);
+ tv[1] = convert_timespec_to_timeval(source_stats.st_ex_mtime);
+#ifdef HAVE_LUTIMES
+ lutimes(dest, tv);
+#else
+ utimes(dest, tv);
+#endif
+ }
+#elif defined(HAVE_UTIME)
+ {
+ struct utimbuf tv;
+
+ tv.actime = convert_timespec_to_time_t(source_stats.st_ex_atime);
+ tv.modtime = convert_timespec_to_time_t(source_stats.st_ex_mtime);
+ utime(dest, &tv);
+ }
+#endif
+
+ if (unlink (source) == -1)
+ return -1;
+
+ return 0;
+
+ err:
+
+ saved_errno = errno;
+ if (ifd != -1)
+ close(ifd);
+ if (ofd != -1)
+ close(ofd);
+ errno = saved_errno;
+ return -1;
+}
+
+
+static int crossrename_rename(vfs_handle_struct *handle,
+ const struct smb_filename *smb_fname_src,
+ const struct smb_filename *smb_fname_dst)
+{
+ int result = -1;
+
+ START_PROFILE(syscall_rename);
+
+ if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
+ errno = ENOENT;
+ goto out;
+ }
+
+ result = rename(smb_fname_src->base_name, smb_fname_dst->base_name);
+ if ((result == -1) && (errno == EXDEV)) {
+ /* Rename across filesystems needed. */
+ result = copy_reg(smb_fname_src->base_name,
+ smb_fname_dst->base_name);
+ }
+
+ out:
+ END_PROFILE(syscall_rename);
+ return result;
+}
+
+static struct vfs_fn_pointers vfs_crossrename_fns = {
+ .connect_fn = crossrename_connect,
+ .rename = crossrename_rename
+};
+
+NTSTATUS vfs_crossrename_init(void);
+NTSTATUS vfs_crossrename_init(void)
+{
+ return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE,
+ &vfs_crossrename_fns);
+}
+