From cfa10b0f972005b38ed294bca66cebf2f65298ec Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Thu, 24 May 2018 14:48:33 -0500 Subject: [PATCH] xfs_io: add label command This adds an online get/set/clear label command to xfs_io. Signed-off-by: Eric Sandeen Reviewed-by: Dave Chinner Signed-off-by: Eric Sandeen --- io/Makefile | 6 +-- io/init.c | 1 + io/io.h | 1 + io/label.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ man/man8/xfs_io.8 | 13 +++++++ 5 files changed, 126 insertions(+), 3 deletions(-) create mode 100644 io/label.c Index: xfsprogs-4.5.0/io/Makefile =================================================================== --- xfsprogs-4.5.0.orig/io/Makefile +++ xfsprogs-4.5.0/io/Makefile @@ -9,7 +9,7 @@ LTCOMMAND = xfs_io LSRCFILES = xfs_bmap.sh xfs_freeze.sh xfs_mkfile.sh HFILES = init.h io.h CFILES = init.c \ - attr.c bmap.c file.c freeze.c fsync.c getrusage.c imap.c link.c \ + attr.c bmap.c file.c freeze.c fsync.c getrusage.c imap.c label.c link.c \ mmap.c open.c parent.c pread.c prealloc.c pwrite.c seek.c shutdown.c \ sync.c truncate.c reflink.c Index: xfsprogs-4.5.0/io/init.c =================================================================== --- xfsprogs-4.5.0.orig/io/init.c +++ xfsprogs-4.5.0/io/init.c @@ -65,6 +65,7 @@ init_commands(void) help_init(); imap_init(); inject_init(); + label_init(); seek_init(); madvise_init(); mincore_init(); Index: xfsprogs-4.5.0/io/io.h =================================================================== --- xfsprogs-4.5.0.orig/io/io.h +++ xfsprogs-4.5.0/io/io.h @@ -102,6 +102,7 @@ extern void getrusage_init(void); extern void help_init(void); extern void imap_init(void); extern void inject_init(void); +extern void label_init(void); extern void mmap_init(void); extern void open_init(void); extern void parent_init(void); Index: xfsprogs-4.5.0/io/label.c =================================================================== --- /dev/null +++ xfsprogs-4.5.0/io/label.c @@ -0,0 +1,108 @@ +/* + * Copyright (c) 2018 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 +#include +#include "platform_defs.h" +#include "libxfs.h" +#include "path.h" +#include "command.h" +#include "init.h" +#include "io.h" + +#ifndef FS_IOC_GETFSLABEL +/* Max chars for the interface; fs limits may differ */ +#define FSLABEL_MAX 256 +#define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX]) +#define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX]) +#endif + +static cmdinfo_t label_cmd; + +static void +label_help(void) +{ + printf(_( +"\n" +" Manipulate or query the filesystem label while mounted.\n" +"\n" +" With no arguments, displays the current filesystem label.\n" +" -s newlabel -- set the filesystem label to newlabel\n" +" -c -- clear the filesystem label (sets to NULL string)\n" +"\n")); +} + +static int +label_f( + int argc, + char **argv) +{ + int c; + int error; + char label[FSLABEL_MAX]; + + if (argc == 1) { + memset(label, 0, sizeof(label)); + error = ioctl(file->fd, FS_IOC_GETFSLABEL, &label); + goto out; + } + + while ((c = getopt(argc, argv, "cs:")) != EOF) { + switch (c) { + case 'c': + label[0] = '\0'; + break; + case 's': + strncpy(label, optarg, sizeof(label)); + break; + default: + return command_usage(&label_cmd); + } + } + + /* Check for trailing arguments */ + if (argc != optind) + return command_usage(&label_cmd); + + error = ioctl(file->fd, FS_IOC_SETFSLABEL, label); +out: + if (error) { + perror("label"); + exitcode = 1; + } else { + printf("label = \"%s\"\n", label); + } + + return 0; +} + +void +label_init(void) +{ + label_cmd.name = "label"; + label_cmd.cfunc = label_f; + label_cmd.argmin = 0; + label_cmd.argmax = 3; + label_cmd.args = _("[-s label|-c]"); + label_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK; + label_cmd.oneline = + _("query, set, or clear the filesystem label while mounted"); + label_cmd.help = label_help; + + add_command(&label_cmd); +} Index: xfsprogs-4.5.0/man/man8/xfs_io.8 =================================================================== --- xfsprogs-4.5.0.orig/man/man8/xfs_io.8 +++ xfsprogs-4.5.0/man/man8/xfs_io.8 @@ -812,7 +812,19 @@ verbose output will be printed. .IP .B [NOTE: Not currently operational on Linux.] .PD - +.TP +.BI "label" " " "[ -c | -s " label " ] " +On filesystems that support online label manipulation, get, set, or clear the +filesystem label. With no options, print the current filesystem label. The +.B \-c +option clears the filesystem label by setting it to the null string. The +.BI "\-s " label +option sets the filesystem label to +.IR label . +If the label is longer than the filesystem will accept, +.B xfs_io +will print an error message. XFS filesystem labels can be at most 12 +characters long. .SH SEE ALSO .BR mkfs.xfs (8), .BR xfsctl (3),