Gitweb:
http://git.fedorahosted.org/git/gfs2-utils.git?p=gfs2-utils.git;a=commitd...
Commit: fb6372ed083c08c0e66f7f7ebd5bdce64f220921
Parent: 5158b880e285481c378d82136eeff30ec5215750
Author: Goldwyn Rodrigues <rgoldwyn(a)gmail.com>
AuthorDate: Fri Aug 6 21:24:10 2010 -0500
Committer: Goldwyn Rodrigues <rgoldwyn(a)gmail.com>
CommitterDate: Fri Aug 6 21:24:10 2010 -0500
[PATCH 2/3] tunegfs2: Add operations to modify the superblock
---
gfs2/tune/super.c | 228 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 228 insertions(+), 0 deletions(-)
diff --git a/gfs2/tune/super.c b/gfs2/tune/super.c
new file mode 100644
index 0000000..1d3e99e
--- /dev/null
+++ b/gfs2/tune/super.c
@@ -0,0 +1,228 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <string.h>
+#include <libintl.h>
+#define _(String) gettext(String)
+#include <linux_endian.h>
+#include <linux/gfs2_ondisk.h>
+#include "tunegfs2.h"
+
+static int str_to_hexchar(const char *estring)
+{
+ int ch = 0;
+
+ if (isdigit(*estring))
+ ch = (*estring - '0') * 0x10;
+ else if (*estring >= 'a' && *estring <= 'f')
+ ch = (*estring - 'a' + 0x0a) * 0x10;
+ else if (*estring >= 'A' && *estring <= 'F')
+ ch = (*estring - 'A' + 0x0a) * 0x10;
+
+ estring++;
+ if (isdigit(*estring))
+ ch += (*estring - '0');
+ else if (*estring >= 'a' && *estring <= 'f')
+ ch += (*estring - 'a' + 0x0a);
+ else if (*estring >= 'A' && *estring <= 'F')
+ ch += (*estring - 'A' + 0x0a);
+ return ch;
+}
+
+
+
+static const char *uuid2str(const unsigned char *uuid)
+{
+ static char str[64];
+ char *ch;
+ int i;
+
+ memset(str, 0, 64);
+ ch = str;
+ for (i = 0; i < 16; i++) {
+ sprintf(ch, "%02X", uuid[i]);
+ ch += 2;
+ if ((i == 3) || (i == 5) || (i == 7) || (i == 9)) {
+ *ch = '-';
+ ch++;
+ }
+ }
+ return str;
+}
+
+static int str2uuid(const char *newval, char *uuid)
+{
+ char *cp;
+ int i;
+
+ if (strlen(newval) != 36) {
+ fprintf(stderr, _("Invalid UUID specified.\n"));
+ return -EINVAL;
+ }
+
+ cp = uuid;
+ for (i = 0; i < 36; i++) {
+ if ((i == 8) || (i == 13) ||
+ (i == 18) || (i == 23)) {
+ if (newval[i] == '-')
+ continue;
+ fprintf(stderr, _("uuid %s has an invalid format."),
+ newval);
+ return -EINVAL;
+ }
+ if (!isxdigit(newval[i])) {
+ fprintf(stderr, _("uuid %s has an invalid hex "
+ "digit '%c' at offset %d.\n"),
+ newval, newval[i], i + 1);
+ return -EINVAL;
+ }
+ *cp = str_to_hexchar(&newval[i++]);
+ cp++;
+ }
+ return 0;
+}
+
+int read_super(struct tunegfs2 *tfs)
+{
+ char *block;
+ int n;
+ tfs->sb_start = GFS2_SB_ADDR << GFS2_BASIC_BLOCK_SHIFT;
+ block = (char *)malloc(sizeof(char) * GFS2_DEFAULT_BSIZE);
+ n = pread(tfs->fd, block, GFS2_DEFAULT_BSIZE, tfs->sb_start);
+ if (n < 0) {
+ fprintf(stderr, _("Error reading from device"));
+ return errno;
+ }
+ tfs->sb = (struct gfs2_sb *)(block);
+ if (be32_to_cpu(tfs->sb->sb_header.mh_magic != GFS_MAGIC) &&
+ (be32_to_cpu(tfs->sb->sb_header.mh_magic) != GFS2_MAGIC)) {
+ fprintf(stderr, _("Not a GFS2 device\n"));
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int print_super(struct tunegfs2 *tfs)
+{
+ char *fsname = NULL;
+ int table_len = 0, fsname_len = 0;
+
+ fprintf(stdout, _("Superblock Details\n"));
+ fprintf(stdout, _("Block size: %d\n"), be32_to_cpu(tfs->sb->sb_bsize));
+ fprintf(stdout, _("Block shift: %d\n"),
be32_to_cpu(tfs->sb->sb_bsize_shift));
+ fprintf(stdout, _("Locking Protocol: %.*s\n"), GFS2_LOCKNAME_LEN,
+ tfs->sb->sb_lockproto);
+ fsname = strchr(tfs->sb->sb_locktable, ':');
+ if (fsname) {
+ table_len = fsname - tfs->sb->sb_locktable;
+ fsname_len = GFS2_LOCKNAME_LEN - table_len - 1;
+ fsname++;
+ }
+
+ fprintf(stdout, _("lock table: %.*s\n"), table_len,
+ tfs->sb->sb_locktable);
+ fprintf(stdout, _("fsname: %.*s\n"), fsname_len, fsname);
+ if (be32_to_cpu(tfs->sb->sb_header.mh_magic) == GFS2_MAGIC)
+ fprintf(stdout, _("Superblock UUID: %s\n"),
+ uuid2str(tfs->sb->sb_uuid));
+ return 0;
+}
+
+int write_super(struct tunegfs2 *tfs)
+{
+ char *block = (char *)tfs->sb;
+ int n;
+ n = pwrite(tfs->fd, block, GFS2_DEFAULT_BSIZE, tfs->sb_start);
+ if (n<0) {
+ fprintf(stderr, _("Unable to write super block\n"));
+ return -errno;
+ }
+ return 0;
+}
+
+int change_label(struct tunegfs2 *tfs, char *fsname)
+{
+ char *sb_fsname = NULL;
+ int l = strlen(fsname), table_len = 0, fsname_len = 0;
+
+ sb_fsname = strchr(tfs->sb->sb_locktable, ':');
+ if (sb_fsname) {
+ table_len = sb_fsname - tfs->sb->sb_locktable;
+ fsname_len = GFS2_LOCKNAME_LEN - table_len - 1;
+ sb_fsname++;
+ }
+ if (fsname_len < l) {
+ fprintf(stderr, _("Label too long\n"));
+ return -E2BIG;
+ }
+ memset(sb_fsname, '\0', fsname_len);
+ memcpy(sb_fsname, fsname, l);
+ return 0;
+}
+
+int change_uuid(struct tunegfs2 *tfs, char *str)
+{
+ char uuid[16];
+ int status = 0;
+ if (be32_to_cpu(tfs->sb->sb_header.mh_magic) != GFS2_MAGIC) {
+ fprintf(stderr, _("UUID can be changed for a GFS2"));
+ fprintf(stderr, _(" device only\n"));
+ return -EINVAL;
+ }
+ status = str2uuid(str, uuid);
+ if (!status) {
+ memset(tfs->sb->sb_uuid , '\0', 16);
+ strncpy((char *)tfs->sb->sb_uuid, uuid, 16);
+ }
+ return status;
+}
+
+
+int change_lockproto(struct tunegfs2 *tfs, char *lockproto)
+{
+ int l = strlen(lockproto);
+ if (strncmp(lockproto, "lock_dlm", 8)
+ && strncmp(lockproto, "lock_nolock", 11)) {
+ fprintf(stderr, _("Incorrect lockproto specified\n"));
+ return -EINVAL;
+ }
+ memset(tfs->sb->sb_lockproto, '\0', GFS2_LOCKNAME_LEN);
+ strncpy(tfs->sb->sb_lockproto, lockproto, l);
+ return 0;
+}
+
+int change_locktable(struct tunegfs2 *tfs, char *locktable)
+{
+ char *sb_fsname = NULL;
+ char t_fsname[GFS2_LOCKNAME_LEN];
+ int l = strlen(locktable), table_len = 0, fsname_len = 0;
+
+ sb_fsname = strchr(tfs->sb->sb_locktable, ':');
+ if (sb_fsname) {
+ table_len = sb_fsname - tfs->sb->sb_locktable;
+ fsname_len = GFS2_LOCKNAME_LEN - table_len - 1;
+ sb_fsname++;
+ }
+ /* Gotta check if the existing fsname will allow us to fit in
+ * the new locktable name */
+ fsname_len = strlen(sb_fsname);
+ if (fsname_len > GFS2_LOCKNAME_LEN - table_len - 1)
+ fsname_len = GFS2_LOCKNAME_LEN - table_len - 1;
+
+ if (l > GFS2_LOCKNAME_LEN - fsname_len - 1) {
+ fprintf(stderr, _("Lock table name too big\n"));
+ return -E2BIG;
+ }
+ memset(t_fsname, '\0', GFS2_LOCKNAME_LEN);
+ strncpy(t_fsname, sb_fsname, fsname_len);
+ memset(tfs->sb->sb_locktable, '\0', GFS2_LOCKNAME_LEN);
+ sprintf(tfs->sb->sb_locktable, "%s:%s", locktable, t_fsname);
+ return 0;
+}
+