This adds a get/set label command to xfs_io.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
V2: Set exitcode rather than error return on ioctl failure
fix ioctl definitions o_O :)
diff --git a/io/Makefile b/io/Makefile
index 88e47517..b40156da 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 0336c962..612962e8 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 a2676361..7f8197ca 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 00000000..7eeab324
--- /dev/null
+++ b/io/label.c
@@ -0,0 +1,75 @@
+/*
+ * 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_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 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_GETFSLABEL, &label);
+ } else {
+ strncpy(label, argv[1], sizeof(label));
+ error = ioctl(file->fd, FS_IOC_SETFSLABEL, label);
+ }
+
+ 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 = 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 c3ab532d..52b983d5 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, excluding any terminating NULL.
.SH SEE ALSO
.BR mkfs.xfs (8),
.BR xfsctl (3),
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