summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--Makefile2
-rw-r--r--btrfs.c5
-rw-r--r--btrfs_cmds.c16
-rw-r--r--btrfs_cmds.h1
-rw-r--r--btrfslabel.c121
-rw-r--r--btrfslabel.h5
-rw-r--r--man/btrfs.8.in19
-rw-r--r--utils.c57
-rw-r--r--utils.h2
9 files changed, 222 insertions, 6 deletions
diff --git a/Makefile b/Makefile
index d65f6a22..4b95d2f0 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ CFLAGS = -g -Werror -Os
objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
root-tree.o dir-item.o file-item.o inode-item.o \
inode-map.o crc32c.o rbtree.o extent-cache.o extent_io.o \
- volumes.o utils.o btrfs-list.o
+ volumes.o utils.o btrfs-list.o btrfslabel.o
#
CHECKFLAGS=-D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise \
diff --git a/btrfs.c b/btrfs.c
index 62140efb..4cd42102 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -108,11 +108,6 @@ static struct Command commands[] = {
"device delete", "<device> [<device>...] <path>\n"
"Remove a device from a filesystem."
},
- /* coming soon
- { 2, "filesystem label", "<label> <path>\n"
- "Set the label of a filesystem"
- }
- */
{ 0, 0 , 0 }
};
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index 26d4fccd..6de73f4d 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -40,6 +40,7 @@
#include "volumes.h"
#include "btrfs_cmds.h"
+#include "btrfslabel.h"
#ifdef __CHECKER__
#define BLKGETSIZE64 0
@@ -874,6 +875,21 @@ int do_set_default_subvol(int nargs, char **argv)
return 0;
}
+int do_change_label(int nargs, char **argv)
+{
+ /* check the number of argument */
+ if ( nargs > 3 ){
+ fprintf(stderr, "ERROR: '%s' requires maximum 2 args\n",
+ argv[0]);
+ return -2;
+ }else if (nargs == 2){
+ return get_label(argv[1]);
+ } else { /* nargs == 0 */
+ return set_label(argv[1], argv[2]);
+ }
+}
+
+
int do_df_filesystem(int nargs, char **argv)
{
struct btrfs_ioctl_space_args *sargs;
diff --git a/btrfs_cmds.h b/btrfs_cmds.h
index 7bde1910..ab722d4f 100644
--- a/btrfs_cmds.h
+++ b/btrfs_cmds.h
@@ -32,3 +32,4 @@ int list_subvols(int fd);
int do_df_filesystem(int nargs, char **argv);
int find_updated_files(int fd, u64 root_id, u64 oldest_gen);
int do_find_newer(int argc, char **argv);
+int do_change_label(int argc, char **argv);
diff --git a/btrfslabel.c b/btrfslabel.c
new file mode 100644
index 00000000..c9f46844
--- /dev/null
+++ b/btrfslabel.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2008 Morey Roof. 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 v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will 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 to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#define _GNU_SOURCE
+
+#ifndef __CHECKER__
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include "ioctl.h"
+#endif /* __CHECKER__ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/fs.h>
+#include <linux/limits.h>
+#include <ctype.h>
+#include "kerncompat.h"
+#include "ctree.h"
+#include "utils.h"
+#include "version.h"
+#include "disk-io.h"
+#include "transaction.h"
+
+#define MOUNTED 1
+#define UNMOUNTED 2
+#define GET_LABEL 3
+#define SET_LABEL 4
+
+static void change_label_unmounted(char *dev, char *nLabel)
+{
+ struct btrfs_root *root;
+ struct btrfs_trans_handle *trans;
+
+ /* Open the super_block at the default location
+ * and as read-write.
+ */
+ root = open_ctree(dev, 0, 1);
+
+ trans = btrfs_start_transaction(root, 1);
+ strncpy(root->fs_info->super_copy.label, nLabel, BTRFS_LABEL_SIZE);
+ btrfs_commit_transaction(trans, root);
+
+ /* Now we close it since we are done. */
+ close_ctree(root);
+}
+
+static void get_label_unmounted(char *dev)
+{
+ struct btrfs_root *root;
+
+ /* Open the super_block at the default location
+ * and as read-only.
+ */
+ root = open_ctree(dev, 0, 0);
+
+ fprintf(stdout, "%s\n", root->fs_info->super_copy.label);
+
+ /* Now we close it since we are done. */
+ close_ctree(root);
+}
+
+int get_label(char *btrfs_dev)
+{
+
+ int ret;
+ ret = check_mounted(btrfs_dev);
+ if (ret < 0)
+ {
+ fprintf(stderr, "FATAL: error checking %s mount status\n", btrfs_dev);
+ return -1;
+ }
+
+ if(ret != 0)
+ {
+ fprintf(stderr, "FATAL: the filesystem has to be unmounted\n");
+ return -2;
+ }
+ get_label_unmounted(btrfs_dev);
+ return 0;
+}
+
+
+int set_label(char *btrfs_dev, char *nLabel)
+{
+
+ int ret;
+ ret = check_mounted(btrfs_dev);
+ if (ret < 0)
+ {
+ fprintf(stderr, "FATAL: error checking %s mount status\n", btrfs_dev);
+ return -1;
+ }
+
+ if(ret != 0)
+ {
+ fprintf(stderr, "FATAL: the filesystem has to be unmounted\n");
+ return -2;
+ }
+ change_label_unmounted(btrfs_dev, nLabel);
+ return 0;
+}
diff --git a/btrfslabel.h b/btrfslabel.h
new file mode 100644
index 00000000..abf43ad8
--- /dev/null
+++ b/btrfslabel.h
@@ -0,0 +1,5 @@
+/* btrflabel.h */
+
+
+int get_label(char *btrfs_dev);
+int set_label(char *btrfs_dev, char *nLabel); \ No newline at end of file
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index b9b89130..6f92f916 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -19,6 +19,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBfilesystem resize\fP\fI [+/\-]<size>[gkm]|max <filesystem>\fP
.PP
+\fBbtrfs\fP \fBfilesystem label\fP\fI <dev> [newlabel]\fP
+.PP
\fBbtrfs\fP \fBfilesystem defrag\fP\fI [options] <file>|<dir> [<file>|<dir>...]\fP
.PP
\fBbtrfs\fP \fBsubvolume find-new\fP\fI <subvolume> <last_gen>\fP
@@ -164,6 +166,23 @@ can expand the partition before enlarging the filesystem and shrink the
partition after reducing the size of the filesystem.
.TP
+\fBbtrfs\fP \fBfilesystem label\fP\fI <dev> [newlabel]\fP
+Show or update the label of a filesystem. \fI<dev>\fR is used to identify the
+filesystem.
+If a \fInewlabel\fR optional argument is passed, the label is changed. The
+following costraints exist for a label:
+.IP
+- the maximum allowable lenght shall be less or equal than 256 chars
+.IP
+- the label shall not contain the '/' or '\\' characters.
+
+NOTE: Currently there are the following limitations:
+.IP
+- the filesystem has to be unmounted
+.IP
+- the filesystem should not have more than one device.
+.TP
+
\fBfilesystem show\fR [<uuid>|<label>]\fR
Show the btrfs filesystem with some additional info. If no UUID or label is
passed, \fBbtrfs\fR show info of all the btrfs filesystem.
diff --git a/utils.c b/utils.c
index ad980aed..13373c99 100644
--- a/utils.c
+++ b/utils.c
@@ -812,6 +812,39 @@ out_mntloop_err:
return ret;
}
+/* Gets the mount point of btrfs filesystem that is using the specified device.
+ * Returns 0 is everything is good, <0 if we have an error.
+ * TODO: Fix this fucntion and check_mounted to work with multiple drive BTRFS
+ * setups.
+ */
+int get_mountpt(char *dev, char *mntpt, size_t size)
+{
+ struct mntent *mnt;
+ FILE *f;
+ int ret = 0;
+
+ f = setmntent("/proc/mounts", "r");
+ if (f == NULL)
+ return -errno;
+
+ while ((mnt = getmntent(f)) != NULL )
+ {
+ if (strcmp(dev, mnt->mnt_fsname) == 0)
+ {
+ strncpy(mntpt, mnt->mnt_dir, size);
+ break;
+ }
+ }
+
+ if (mnt == NULL)
+ {
+ /* We didn't find an entry so lets report an error */
+ ret = -1;
+ }
+
+ return ret;
+}
+
struct pending_dir {
struct list_head list;
char name[256];
@@ -1002,3 +1035,27 @@ char *pretty_sizes(u64 size)
return pretty;
}
+/*
+ * Checks to make sure that the label matches our requirements.
+ * Returns:
+ 0 if everything is safe and usable
+ -1 if the label is too long
+ -2 if the label contains an invalid character
+ */
+int check_label(char *input)
+{
+ int i;
+ int len = strlen(input);
+
+ if (len > BTRFS_LABEL_SIZE) {
+ return -1;
+ }
+
+ for (i = 0; i < len; i++) {
+ if (input[i] == '/' || input[i] == '\\') {
+ return -2;
+ }
+ }
+
+ return 0;
+}
diff --git a/utils.h b/utils.h
index a28d7f4b..c3004ae8 100644
--- a/utils.h
+++ b/utils.h
@@ -40,4 +40,6 @@ int check_mounted(const char *devicename);
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
int super_offset);
char *pretty_sizes(u64 size);
+int check_label(char *input);
+int get_mountpt(char *dev, char *mntpt, size_t size);
#endif