ops_lustre.c revision 310490 
1/*
2 * Copyright (c) 2011 Christos Zoulas
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *
27 * File: am-utils/amd/ops_lustre.c
28 *
29 */
30
31/*
32 * Lustre file system
33 */
34
35#ifdef HAVE_CONFIG_H
36# include <config.h>
37#endif /* HAVE_CONFIG_H */
38#ifdef HAVE_FS_LUSTRE
39#include <am_defs.h>
40#include <amd.h>
41
42/* forward declarations */
43static char *lustre_match(am_opts *fo);
44static int lustre_mount(am_node *am, mntfs *mf);
45static int lustre_umount(am_node *am, mntfs *mf);
46
47/*
48 * Ops structure
49 */
50am_ops lustre_ops =
51{
52  "lustre",
53  lustre_match,
54  0,				/* lustre_init */
55  lustre_mount,
56  lustre_umount,
57  amfs_error_lookup_child,
58  amfs_error_mount_child,
59  amfs_error_readdir,
60  0,				/* lustre_readlink */
61  0,				/* lustre_mounted */
62  0,				/* lustre_umounted */
63  amfs_generic_find_srvr,
64  0,				/* lustre_get_wchan */
65  FS_MKMNT | FS_UBACKGROUND | FS_AMQINFO,	/* nfs_fs_flags */
66#ifdef HAVE_FS_AUTOFS
67  AUTOFS_LUSTRE_FS_FLAGS,
68#endif /* HAVE_FS_AUTOFS */
69};
70
71
72/*
73 * Lustre needs remote filesystem and host.
74 */
75static char *
76lustre_match(am_opts *fo)
77{
78  char *xmtab, *cp;
79  size_t l;
80  char *rhost, *ptr, *remhost;
81  struct in_addr addr;
82
83  if (fo->opt_fs && !fo->opt_rfs)
84    fo->opt_rfs = fo->opt_fs;
85  if (!fo->opt_rfs) {
86    plog(XLOG_USER, "lustre: no remote filesystem specified");
87    return NULL;
88  }
89  if (!fo->opt_rhost) {
90    plog(XLOG_USER, "lustre: no remote host specified");
91    return NULL;
92  }
93
94  /*
95   * Determine magic cookie to put in mtab
96   */
97  rhost = xstrdup(fo->opt_rhost);
98  remhost = NULL;
99  for (ptr = strtok(rhost, ":"); ptr; ptr = strtok(NULL, ":")) {
100    char *at = strchr(ptr, '@');
101    if (at == NULL) {
102      plog(XLOG_USER, "lustre: missing protocol in host `%s'", ptr);
103      XFREE(rhost);
104      return NULL;
105    }
106    *at = '\0';
107    /*
108     * Convert symbolic addresses to numbers that the kernel likes
109     */
110    if (inet_aton(ptr, &addr) == 0) {
111      struct hostent *hp;
112      if ((hp = gethostbyname(ptr)) == NULL) {
113	plog(XLOG_USER, "lustre: unknown host `%s'", ptr);
114	XFREE(rhost);
115	return NULL;
116      }
117      if (hp->h_length != sizeof(addr.s_addr)) {
118	plog(XLOG_USER, "lustre: bad address length %zu != %d for %s",
119	  sizeof(addr), hp->h_length, ptr);
120	XFREE(rhost);
121	return NULL;
122      }
123      memcpy(&addr.s_addr, hp->h_addr, sizeof(addr));
124    }
125    *at = '@';
126
127    cp = remhost;
128    if (remhost)
129      remhost = strvcat(cp, ":", inet_ntoa(addr), at, NULL);
130    else
131      remhost = strvcat(inet_ntoa(addr), at, NULL);
132    XFREE(cp);
133  }
134  if (remhost == NULL) {
135    plog(XLOG_USER, "lustre: empty host");
136    XFREE(rhost);
137    return NULL;
138  }
139
140  XFREE(rhost);
141  XFREE(fo->opt_rhost);
142  fo->opt_rhost = remhost;
143
144  l = strlen(fo->opt_rhost) + strlen(fo->opt_rfs) + 2;
145  xmtab = xmalloc(l);
146  xsnprintf(xmtab, l, "%s:%s", fo->opt_rhost, fo->opt_rfs);
147  dlog("lustre: mounting remote server \"%s\", remote fs \"%s\" on \"%s\"",
148       fo->opt_rhost, fo->opt_rfs, fo->opt_fs);
149
150
151  return xmtab;
152}
153
154static int
155lustre_mount(am_node *am, mntfs *mf)
156{
157  mntent_t mnt;
158  int genflags, error;
159  int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
160
161  /*
162   * Figure out the name of the file system type.
163   */
164  MTYPE_TYPE type = MOUNT_TYPE_LUSTRE;
165
166  /*
167   * Fill in the mount structure
168   */
169  memset(&mnt, 0, sizeof(mnt));
170  mnt.mnt_dir = mf->mf_mount;
171  mnt.mnt_fsname = mf->mf_info;
172  mnt.mnt_type = MNTTAB_TYPE_LUSTRE;
173  mnt.mnt_opts = mf->mf_mopts;
174
175  genflags = compute_mount_flags(&mnt);
176#ifdef HAVE_FS_AUTOFS
177  if (on_autofs)
178    genflags |= autofs_compute_mount_flags(&mnt);
179#endif /* HAVE_FS_AUTOFS */
180
181  /*
182   * Call generic mount routine
183   */
184  error = mount_fs(&mnt, genflags, NULL, 0, type, 0,
185      NULL, mnttab_file_name, on_autofs);
186  if (error) {
187    errno = error;
188    plog(XLOG_ERROR, "mount_lustre: %m");
189    return error;
190  }
191
192  return 0;
193}
194
195
196static int
197lustre_umount(am_node *am, mntfs *mf)
198{
199  int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
200
201  return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
202}
203#endif
204