On Mon, Apr 30, 2018 at 10:48:54AM -0500, Eric Sandeen wrote:
> This adds a get/set label command to xfs_io.
>
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
>
> diff --git a/io/Makefile b/io/Makefile
> index 88e4751..b40156d 100644
> --- a/io/Makefile
> +++ b/io/Makefile
> @@ -10,9 +10,9 @@ LSRCFILES = xfs_bmap.sh xfs_freeze.sh xfs_mkfile.sh
> HFILES = init.h io.h
> CFILES = init.c \
> attr.c bmap.c cowextsize.c encrypt.c file.c freeze.c fsync.c \
> - getrusage.c imap.c link.c mmap.c open.c parent.c pread.c prealloc.c \
> - pwrite.c reflink.c scrub.c seek.c shutdown.c stat.c swapext.c sync.c \
> - truncate.c utimes.c
> + getrusage.c imap.c label.c link.c mmap.c open.c parent.c pread.c \
> + prealloc.c pwrite.c reflink.c scrub.c seek.c shutdown.c stat.c \
> + swapext.c sync.c truncate.c utimes.c
>
> LLDLIBS = $(LIBXCMD) $(LIBHANDLE) $(LIBFROG) $(LIBPTHREAD)
> LTDEPENDENCIES = $(LIBXCMD) $(LIBHANDLE) $(LIBFROG)
> diff --git a/io/init.c b/io/init.c
> index 0336c96..612962e 100644
> --- a/io/init.c
> +++ b/io/init.c
> @@ -72,6 +72,7 @@ init_commands(void)
> help_init();
> imap_init();
> inject_init();
> + label_init();
> log_writes_init();
> madvise_init();
> mincore_init();
> diff --git a/io/io.h b/io/io.h
> index a267636..7f8197c 100644
> --- a/io/io.h
> +++ b/io/io.h
> @@ -109,6 +109,7 @@ 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);
> diff --git a/io/label.c b/io/label.c
> new file mode 100644
> index 0000000..acab67f
> --- /dev/null
> +++ b/io/label.c
> @@ -0,0 +1,74 @@
> +/*
> + * 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 <sys/ioctl.h>
> +#include <sys/mount.h>
> +#include "platform_defs.h"
> +#include "libxfs.h"
> +#include "path.h"
> +#include "command.h"
> +#include "init.h"
> +#include "io.h"
> +
> +#ifndef FS_IOC_GET_FSLABEL
> +/* Max chars for the interface; fs limits may differ */
> +#define FSLABEL_MAX 256
> +#define FS_IOC_GET_FSLABEL _IOR(0x94, 49, char[FSLABEL_MAX])
> +#define FS_IOC_SET_FSLABEL _IOW(0x94, 50, char[FSLABEL_MAX])
> +#endif
> +
> +static cmdinfo_t label_cmd;
> +
> +static int
> +label_f(
> + int argc,
> + char **argv)
> +{
> + int error;
> + char label[FSLABEL_MAX];
> +
> + if (argc == 1) {
> + memset(&label, 0, sizeof(label));
> + error = ioctl(file->fd, FS_IOC_GET_FSLABEL, &label);
> + } else {
> + strncpy(label, argv[1], sizeof(label));
> + error = ioctl(file->fd, FS_IOC_SET_FSLABEL, &label);
> + }
> +
> + if (error)
> + perror("label");
> + else
> + printf("label = \"%s\"\n", label);
> +
> + return error;
> +}
> +
> +void
> +label_init(void)
> +{
> + label_cmd.name = "label";
> + label_cmd.cfunc = label_f;
> + label_cmd.argmin = 0;
> + label_cmd.argmax = 1;
> + label_cmd.args = _("[label]");
> + label_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
> + label_cmd.oneline =
> + _("query or set the filesystem label while mounted");
> +
> + add_command(&label_cmd);
> +}
> diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
> index c3ab532..52b983d 100644
> --- a/man/man8/xfs_io.8
> +++ b/man/man8/xfs_io.8
> @@ -1175,6 +1175,16 @@ This is intended to be equivalent to the shell command:
> See the
> .B log_writes
> command.
> +.TP
> +.BI "label" " " [ " label " ]
> +On filesystems that support online label manipulation, set or get the
> +filesystem label. With no options, get the current filesystem label.
> +With one option, set 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.
Needs proper ioctl_[gs]etlabel manpage documenting the semantics of this
new xfs ioctl, though that should be sent to mkerrisk/linux-api so we
don't have to maintain it. :)
--D
> .SH SEE ALSO
> .BR mkfs.xfs (8),
> .BR xfsctl (3),
>
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