| /* |
| * Copyright (c) 2012 Red Hat, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "command.h" |
| #include "input.h" |
| #include "init.h" |
| #include "io.h" |
| |
| static cmdinfo_t sync_range_cmd; |
| |
| static void |
| sync_range_help(void) |
| { |
| printf(_( |
| "\n" |
| " Trigger specific writeback commands on a range of the current file\n" |
| "\n" |
| " With no options, the SYNC_FILE_RANGE_WRITE is implied.\n" |
| " -a -- wait for IO to finish after writing (SYNC_FILE_RANGE_WAIT_AFTER).\n" |
| " -b -- wait for IO to finish before writing (SYNC_FILE_RANGE_WAIT_BEFORE).\n" |
| " -w -- write dirty data in range (SYNC_FILE_RANGE_WRITE).\n" |
| "\n")); |
| } |
| |
| static int |
| sync_range_f( |
| int argc, |
| char **argv) |
| { |
| off64_t offset = 0, length = 0; |
| int c, sync_mode = 0; |
| size_t blocksize, sectsize; |
| |
| while ((c = getopt(argc, argv, "abw")) != EOF) { |
| switch (c) { |
| case 'a': |
| sync_mode = SYNC_FILE_RANGE_WAIT_AFTER; |
| break; |
| case 'b': |
| sync_mode = SYNC_FILE_RANGE_WAIT_BEFORE; |
| break; |
| case 'w': |
| sync_mode = SYNC_FILE_RANGE_WRITE; |
| break; |
| default: |
| return command_usage(&sync_range_cmd); |
| } |
| } |
| |
| /* default to just starting writeback on the range */ |
| if (!sync_mode) |
| sync_mode = SYNC_FILE_RANGE_WRITE; |
| |
| if (optind != argc - 2) |
| return command_usage(&sync_range_cmd); |
| init_cvtnum(&blocksize, §size); |
| offset = cvtnum(blocksize, sectsize, argv[optind]); |
| if (offset < 0) { |
| printf(_("non-numeric offset argument -- %s\n"), |
| argv[optind]); |
| return 0; |
| } |
| optind++; |
| length = cvtnum(blocksize, sectsize, argv[optind]); |
| if (length < 0) { |
| printf(_("non-numeric length argument -- %s\n"), |
| argv[optind]); |
| return 0; |
| } |
| |
| if (sync_file_range(file->fd, offset, length, sync_mode) < 0) { |
| perror("sync_file_range"); |
| return 0; |
| } |
| return 0; |
| } |
| |
| void |
| sync_range_init(void) |
| { |
| sync_range_cmd.name = "sync_range"; |
| sync_range_cmd.cfunc = sync_range_f; |
| sync_range_cmd.argmin = 2; |
| sync_range_cmd.argmax = -1; |
| sync_range_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK; |
| sync_range_cmd.args = _("[-abw] off len"); |
| sync_range_cmd.oneline = _("Control writeback on a range of a file"); |
| sync_range_cmd.help = sync_range_help; |
| |
| add_command(&sync_range_cmd); |
| } |