source3/modules/vfs_glusterfs_fuse.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (c) 2019 Guenther Deschner <gd@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "smbd/smbd.h"
  22 #include "system/filesys.h"
  23
  24 #define GLUSTER_NAME_MAX 255
  25
  26 static int vfs_gluster_fuse_get_real_filename(struct vfs_handle_struct *handle,
  27                                               const char *path,
  28                                               const char *name,
  29                                               TALLOC_CTX *mem_ctx,
  30                                               char **_found_name)
  31 {
  32         int ret;
  33         char key_buf[GLUSTER_NAME_MAX + 64];
  34         char val_buf[GLUSTER_NAME_MAX + 1];
  35         char *found_name = NULL;
  36
  37         if (strlen(name) >= GLUSTER_NAME_MAX) {
  38                 errno = ENAMETOOLONG;
  39                 return -1;
  40         }
  41
  42         snprintf(key_buf, GLUSTER_NAME_MAX + 64,
  43                  "glusterfs.get_real_filename:%s", name);
  44
  45         ret = getxattr(path, key_buf, val_buf, GLUSTER_NAME_MAX + 1);
  46         if (ret == -1) {
  47                 if (errno == ENOATTR) {
  48                         errno = ENOENT;
  49                 }
  50                 return -1;
  51         }
  52
  53         found_name = talloc_strdup(mem_ctx, val_buf);
  54         if (found_name == NULL) {
  55                 errno = ENOMEM;
  56                 return -1;
  57         }
  58         *_found_name = found_name;
  59         return 0;
  60 }
  61
  62 struct vfs_fn_pointers glusterfs_fuse_fns = {
  63
  64         /* File Operations */
  65         .get_real_filename_fn = vfs_gluster_fuse_get_real_filename,
  66 };
  67
  68 static_decl_vfs;
  69 NTSTATUS vfs_glusterfs_fuse_init(TALLOC_CTX *ctx)
  70 {
  71         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
  72                                 "glusterfs_fuse", &glusterfs_fuse_fns);
  73 }