#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
+#include <libgen.h>
#include "e2p/e2p.h"
static void usage (char *prog)
{
fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
- "[-p] device [-b|-s|new_size]\n\n"), prog);
+ "[-p] device [-b|-s|new_size] [-z undo_file]\n\n"),
+ prog);
exit (1);
}
}
}
+static int resize2fs_setup_tdb(const char *device_name, char *undo_file,
+ io_manager *io_ptr)
+{
+ errcode_t retval = ENOMEM;
+ char *tdb_dir = NULL, *tdb_file = NULL;
+ char *dev_name, *tmp_name;
+ int free_tdb_dir = 0;
+
+ /* (re)open a specific undo file */
+ if (undo_file && undo_file[0] != 0) {
+ set_undo_io_backing_manager(*io_ptr);
+ *io_ptr = undo_io_manager;
+ retval = set_undo_io_backup_file(undo_file);
+ if (retval)
+ goto err;
+ printf(_("Overwriting existing filesystem; this can be undone "
+ "using the command:\n"
+ " e2undo %s %s\n\n"),
+ undo_file, device_name);
+ return 0;
+ }
+
+ /*
+ * Configuration via a conf file would be
+ * nice
+ */
+ tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
+
+ if (tdb_dir == NULL || !strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
+ access(tdb_dir, W_OK)) {
+ if (free_tdb_dir)
+ free(tdb_dir);
+ return 0;
+ }
+
+ tmp_name = strdup(device_name);
+ if (!tmp_name)
+ goto errout;
+ dev_name = basename(tmp_name);
+ tdb_file = malloc(strlen(tdb_dir) + 8 + strlen(dev_name) + 7 + 1);
+ if (!tdb_file) {
+ free(tmp_name);
+ goto errout;
+ }
+ sprintf(tdb_file, "%s/resize2fs-%s.e2undo", tdb_dir, dev_name);
+ free(tmp_name);
+
+ if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
+ retval = errno;
+ goto errout;
+ }
+
+ set_undo_io_backing_manager(*io_ptr);
+ *io_ptr = undo_io_manager;
+ retval = set_undo_io_backup_file(tdb_file);
+ if (retval)
+ goto errout;
+ printf(_("Overwriting existing filesystem; this can be undone "
+ "using the command:\n"
+ " e2undo %s %s\n\n"), tdb_file, device_name);
+
+ if (free_tdb_dir)
+ free(tdb_dir);
+ free(tdb_file);
+ return 0;
+
+errout:
+ if (free_tdb_dir)
+ free(tdb_dir);
+ free(tdb_file);
+err:
+ com_err(program_name, retval, "%s",
+ _("while trying to setup undo file\n"));
+ return retval;
+}
+
int main (int argc, char ** argv)
{
errcode_t retval;
unsigned int blocksize;
long sysval;
int len, mount_flags;
- char *mtpt;
+ char *mtpt, *undo_file = NULL;
#ifdef ENABLE_NLS
setlocale(LC_MESSAGES, "");
if (argc && *argv)
program_name = *argv;
- while ((c = getopt(argc, argv, "d:fFhMPpS:bs")) != EOF) {
+ while ((c = getopt(argc, argv, "d:fFhMPpS:bsz:")) != EOF) {
switch (c) {
case 'h':
usage(program_name);
case 's':
flags |= RESIZE_DISABLE_64BIT;
break;
+ case 'z':
+ undo_file = optarg;
+ break;
default:
usage(program_name);
}
io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
io_flags |= EXT2_FLAG_64BITS;
-
+ if (undo_file) {
+ retval = resize2fs_setup_tdb(device_name, undo_file, &io_ptr);
+ if (retval)
+ exit(1);
+ }
retval = ext2fs_open2(device_name, io_options, io_flags,
0, 0, io_ptr, &fs);
if (retval) {
.B \-S
.I RAID-stride
]
+[
+.B \-z
+.I undo_file
+]
.I device
[
.I size
program will heuristically determine the RAID stride that was specified
when the filesystem was created. This option allows the user to
explicitly specify a RAID stride setting to be used by resize2fs instead.
+.TP
+.BI \-z " undo_file"
+Before overwriting a file system block, write the old contents of the block to
+an undo file. This undo file can be used with e2undo(8) to restore the old
+contents of the file system should something go wrong. If the empty string is
+passed as the undo_file argument, the undo file will be written to a file named
+resize2fs-\fIdevice\fR.e2undo in the directory specified via the
+\fIE2FSPROGS_UNDO_DIR\fR environment variable.
+
+WARNING: The undo file cannot be used to recover from a power or system crash.
.SH KNOWN BUGS
The minimum size of the filesystem as estimated by resize2fs may be
incorrect, especially for filesystems with 1k and 2k blocksizes.