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/*
* Module to work around a bug in Linux XFS:
* http://oss.sgi.com/bugzilla/show_bug.cgi?id=280
*
* Copyright (c) Volker Lendecke 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"
#include "system/filesys.h"
#include "smbd/smbd.h"
static int linux_xfs_sgid_mkdir(vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
mode_t mode)
{
struct smb_filename fname = { 0, };
int mkdir_res;
int res;
DEBUG(10, ("Calling linux_xfs_sgid_mkdir(%s)\n", smb_fname->base_name));
mkdir_res = SMB_VFS_NEXT_MKDIR(handle, smb_fname, mode);
if (mkdir_res == -1) {
DEBUG(10, ("SMB_VFS_NEXT_MKDIR returned error: %s\n",
strerror(errno)));
return mkdir_res;
}
if (!parent_dirname(talloc_tos(),
smb_fname->base_name,
&fname.base_name,
NULL)) {
DEBUG(1, ("parent_dirname failed\n"));
/* return success, we did the mkdir */
return mkdir_res;
}
res = SMB_VFS_NEXT_STAT(handle, &fname);
if (res == -1) {
DEBUG(10, ("NEXT_STAT(%s) failed: %s\n", fname.base_name,
strerror(errno)));
/* return success, we did the mkdir */
return mkdir_res;
}
TALLOC_FREE(fname.base_name);
if ((fname.st.st_ex_mode & S_ISGID) == 0) {
/* No SGID to inherit */
DEBUG(10, ("No SGID to inherit\n"));
return mkdir_res;
}
fname.base_name = discard_const_p(char, smb_fname->base_name);
res = SMB_VFS_NEXT_STAT(handle, &fname);
if (res == -1) {
DEBUG(2, ("Could not stat just created dir %s: %s\n",
smb_fname->base_name,
strerror(errno)));
/* return success, we did the mkdir */
return mkdir_res;
}
fname.st.st_ex_mode |= S_ISGID;
fname.st.st_ex_mode &= ~S_IFDIR;
/*
* Yes, we have to do this as root. If you do it as
* non-privileged user, XFS on Linux will just ignore us and
* return success. What can you do...
*/
become_root();
res = SMB_VFS_NEXT_CHMOD(handle,
smb_fname,
fname.st.st_ex_mode);
unbecome_root();
if (res == -1) {
DEBUG(2, ("CHMOD(%s, %o) failed: %s\n", smb_fname->base_name,
(int)fname.st.st_ex_mode, strerror(errno)));
/* return success, we did the mkdir */
return mkdir_res;
}
return mkdir_res;
}
static int linux_xfs_sgid_chmod_acl(vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
mode_t mode)
{
errno = ENOSYS;
return -1;
}
static struct vfs_fn_pointers linux_xfs_sgid_fns = {
.mkdir_fn = linux_xfs_sgid_mkdir,
.chmod_acl_fn = linux_xfs_sgid_chmod_acl,
};
NTSTATUS vfs_linux_xfs_sgid_init(TALLOC_CTX *);
NTSTATUS vfs_linux_xfs_sgid_init(TALLOC_CTX *ctx)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
"linux_xfs_sgid", &linux_xfs_sgid_fns);
}
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