/*
* Author: Brian Behlendorf <behlendorf1@llnl.gov>
*/
+#ifndef HAVE_ZFS_MULTIHOST
+#include <sys/list.h>
+#define list_move_tail(a, b) spl_list_move_tail(a, b)
+#include <sys/spa.h>
+#endif
#include "mount_utils.h"
#include <stddef.h>
#include <stdio.h>
return 0;
}
+/*
+ * ZFS on linux 0.7.0-rc5 commit 379ca9cf2beba802f096273e89e30914a2d6bafc
+ * Multi-modifier protection (MMP)
+ *
+ * Introduced spa_get_hostid() along with a few constants like
+ * ZPOOL_CONFIG_MMP_HOSTID that can be checked to imply availablity of
+ * spa_get_hostid. Supply a fallback when spa_get_hostid is not
+ * available.
+ *
+ * This can be removed when zfs 0.6.x support is dropped.
+ */
+#if !defined(ZPOOL_CONFIG_MMP_HOSTID) && !defined(HAVE_ZFS_MULTIHOST)
+unsigned long _hostid_from_proc(void)
+{
+ FILE *f;
+ unsigned long hostid;
+ int rc;
+
+ f = fopen("/proc/sys/kernel/spl/hostid", "r");
+ if (f == NULL)
+ goto out;
+
+ rc = fscanf(f, "%lx", &hostid);
+ fclose(f);
+ if (rc == 1)
+ return hostid;
+out:
+ return 0;
+}
+
+unsigned long _hostid_from_module_param(void)
+{
+ FILE *f;
+ unsigned long hostid;
+ int rc;
+
+ f = fopen("/sys/module/spl/parameters/spl_hostid", "r");
+ if (f == NULL)
+ goto out;
+
+ rc = fscanf(f, "%li", &hostid);
+ fclose(f);
+ if (rc == 1)
+ return hostid;
+out:
+ return 0;
+}
+
+unsigned long _from_module_param_indirect(void)
+{
+ FILE *f;
+ unsigned long hostid = 0;
+ uint32_t hwid;
+ int rc;
+ char *spl_hostid_path = NULL;
+
+ /* read the module parameter for HW_HOSTID_PATH */
+ f = fopen("/sys/module/spl/parameters/spl_hostid_path", "r");
+ if (f == NULL) {
+ fatal();
+ fprintf(stderr, "Failed to open spl_hostid_path param: %s\n",
+ strerror(errno));
+ goto out;
+ }
+
+ rc = fscanf(f, "%ms%*[\n]", &spl_hostid_path);
+ fclose(f);
+ if (rc == 0 || !spl_hostid_path)
+ goto out;
+
+ /* read the hostid from the file */
+ f = fopen(spl_hostid_path, "r");
+ if (f == NULL) {
+ fatal();
+ fprintf(stderr, "Failed to open %s param: %s\n",
+ spl_hostid_path, strerror(errno));
+ goto out;
+ }
+
+ /* hostid is the first 4 bytes in native endian order */
+ rc = fread(&hwid, sizeof(uint32_t), 1, f);
+ fclose(f);
+ if (rc == 1)
+ hostid = (unsigned long)hwid;
+
+out:
+ if (spl_hostid_path)
+ free(spl_hostid_path);
+
+ return hostid;
+}
+
+unsigned long spa_get_hostid(void)
+{
+ unsigned long hostid;
+
+ hostid = _hostid_from_proc();
+ if (hostid)
+ return hostid;
+
+ /* if /proc isn't available, try /sys */
+ hostid = _hostid_from_module_param();
+ if (hostid)
+ return hostid;
+
+ return _from_module_param_indirect();
+}
+#endif
/*
* Map '<key>=<value> ...' pairs in the passed string to dataset properties
static int zfs_check_hostid(struct mkfs_opts *mop)
{
unsigned long hostid;
-#ifndef HAVE_ZFS_MULTIHOST
- FILE *f;
- int rc;
-#endif
if (strstr(mop->mo_ldd.ldd_params, PARAM_FAILNODE) == NULL)
return 0;
#ifdef HAVE_ZFS_MULTIHOST
hostid = get_system_hostid();
#else
- /* This reimplements libzfs2::get_system_hostid() from 0.7+ because
- * prior to 0.7.0 (MULTIHOST support), get_system_hostid() would return
- * gethostid() if spl_hostid was 0, which would generate a hostid if
- * /etc/hostid wasn't set, which is incompatible with the kernel
- * implementation.
- */
- f = fopen("/sys/module/spl/parameters/spl_hostid", "r");
- if (f == NULL) {
- fatal();
- fprintf(stderr, "Failed to open spl_hostid: %s\n",
- strerror(errno));
- return errno;
- }
- rc = fscanf(f, "%li", &hostid);
- fclose(f);
- if (rc != 1) {
- fatal();
- fprintf(stderr, "Failed to read spl_hostid: %d\n", rc);
- return rc;
- }
-
- if (hostid != 0)
- return 0;
-
- f = fopen(HW_HOSTID_PATH, "r");
- if (f == NULL)
- goto out;
-
- rc = fread(&hostid, sizeof(uint32_t), 1, f);
- fclose(f);
-
- if (rc != 1) {
- fprintf(stderr, "Failed to read "HW_HOSTID_PATH": %d\n",
- rc);
- hostid = 0;
- }
-
-out:
+ hostid = spa_get_hostid();
#endif
if (hostid == 0) {
if (mop->mo_flags & MO_NOHOSTID_CHECK) {
git://git.whamcloud.com / fs / lustre-release.git / commitdiff