xiaoxiang781216 commented on code in PR #1577:
URL: https://github.com/apache/nuttx-apps/pull/1577#discussion_r1111045787
##########
nshlib/nsh_fscmds.c:
##########
@@ -998,6 +1001,170 @@ int cmd_losmart(FAR struct nsh_vtbl_s *vtbl, int argc,
FAR char **argv)
#endif
#endif
+/****************************************************************************
+ * Name: cmd_lomtd
+ ****************************************************************************/
+
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+# if defined(CONFIG_MTD_DEV_LOOP) && !defined(CONFIG_NSH_DISABLE_LOMTD)
+int cmd_lomtd(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
+{
+ FAR char *loopdev = NULL;
+ FAR char *filepath = NULL;
+ struct mtd_losetup_s setup;
+ bool teardown = false;
+ int erasesize = -1;
+ int sectsize = -1;
+ off_t offset = 0;
+ bool badarg = false;
+ int ret = ERROR;
+ int option;
+ int fd;
+
+ /* Get the lomtd options: Two forms are supported:
+ *
+ * lomtd -d <loop-device>
+ * lomtd [-o <offset>] [-e erasesize] [-s sectsize]
+ * <loop-device> <filename>
+ *
+ * NOTE that the -o and -r options are accepted with the -d option, but
+ * will be ignored.
+ */
+
+ while ((option = getopt(argc, argv, "d:o:e:s:")) != ERROR)
+ {
+ switch (option)
+ {
+ case 'd':
+ loopdev = nsh_getfullpath(vtbl, optarg);
+ teardown = true;
+ break;
+
+ case 'e':
+ erasesize = atoi(optarg);
+ break;
+
+ case 'o':
+ offset = atoi(optarg);
+ break;
+
+ case 's':
+ sectsize = atoi(optarg);
+ break;
+
+ case '?':
+ default:
+ nsh_error(vtbl, g_fmtarginvalid, argv[0]);
+ badarg = true;
+ break;
+ }
+ }
+
+ /* If a bad argument was encountered,
+ * then return without processing the command
+ */
+
+ if (badarg)
+ {
+ goto errout_with_paths;
+ }
+
+ /* If this is not a tear down operation, then additional command line
+ * parameters are required.
+ */
+
+ if (!teardown)
+ {
+ /* There must be two arguments on the command line after the options */
+
+ if (optind + 1 < argc)
+ {
+ loopdev = nsh_getfullpath(vtbl, argv[optind]);
+ optind++;
+
+ filepath = nsh_getfullpath(vtbl, argv[optind]);
+ optind++;
+ }
+ else
+ {
+ nsh_error(vtbl, g_fmtargrequired, argv[0]);
+ goto errout_with_paths;
+ }
+ }
+
+ /* There should be nothing else on the command line */
+
+ if (optind < argc)
+ {
+ nsh_error(vtbl, g_fmttoomanyargs, argv[0]);
+ goto errout_with_paths;
+ }
+
+ /* Open the loop device */
+
+ fd = open("/dev/loopmtd", O_RDONLY);
+ if (fd < 0)
+ {
+ nsh_error(vtbl, g_fmtcmdfailed, argv[0], "open", NSH_ERRNO);
+ goto errout_with_paths;
+ }
+
+ /* Perform the teardown operation */
+
+ if (teardown)
+ {
+ /* Tear down the loop device. */
+
+ ret = ioctl(fd, MTD_LOOPIOC_TEARDOWN,
+ (unsigned long)((uintptr_t) loopdev));
+ if (ret < 0)
+ {
+ nsh_error(vtbl, g_fmtcmdfailed, argv[0], "ioctl", NSH_ERRNO);
+ goto errout_with_fd;
+ }
+ }
+ else
+ {
+ /* Set up the loop device */
+
+ setup.devname = loopdev; /* The loop block device to be created */
+ setup.filename = filepath; /* The file or character device to use */
+ setup.sectsize = sectsize; /* The sector size to use with the block
device */
+ setup.erasesize = erasesize; /* The sector size to use with the block
device */
+ setup.offset = offset; /* An offset that may be applied to the
device */
+
+ ret = ioctl(fd, MTD_LOOPIOC_SETUP,
+ (unsigned long)((uintptr_t)&setup));
+ if (ret < 0)
+ {
+ nsh_error(vtbl, g_fmtcmdfailed, argv[0], "ioctl", NSH_ERRNO);
+ goto errout_with_fd;
+ }
+ }
+
+ ret = OK;
+
+ /* Free resources */
+
+errout_with_fd:
+ close(fd);
+
+errout_with_paths:
+ if (loopdev)
+ {
+ free(loopdev);
+ }
+
+ if (filepath)
+ {
+ free(filepath);
+ }
+
+ return ret;
+}
+#endif
Review Comment:
```suggestion
# endif
```
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