--- /dev/null
+/*
+ * 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+
+#include "commands.h"
+#include "props.h"
+#include "ctree.h"
+
+static const char * const property_cmd_group_usage[] = {
+ "btrfs property get/set/list [-t <type>] <object> [<name>] [value]",
+ NULL
+};
+
+static const char * const cmd_get_usage[] = {
+ "btrfs property get [-t <type>] <object> [<name>]",
+ "Gets a property from a btrfs object.",
+ "If no name is specified, all properties for the given object are",
+ "printed.",
+ "A filesystem object can be a the filesystem itself, a subvolume,",
+ "an inode or a device. The '-t <type>' option can be used to explicitly",
+ "specify what type of object you meant. This is only needed when a",
+ "property could be set for more then one object type. Possible types",
+ "are s[ubvol], f[ilesystem], i[node] and d[evice].",
+ NULL
+};
+
+static const char * const cmd_set_usage[] = {
+ "btrfs property set [-t <type>] <object> <name> <value>",
+ "Sets a property on a btrfs object.",
+ "Please see the help of 'btrfs property get' for a description of",
+ "objects and object types.",
+ NULL
+};
+
+static const char * const cmd_list_usage[] = {
+ "btrfs property list [-t <type>] <object>",
+ "Lists available properties with their descriptions for the given object.",
+ "Please see the help of 'btrfs property get' for a description of",
+ "objects and object types.",
+ NULL
+};
+
+static int parse_prop(const char *arg, const struct prop_handler *props,
+ const struct prop_handler **prop_ret)
+{
+ const struct prop_handler *prop = props;
+
+ for (; prop->name; prop++) {
+ if (!strcmp(prop->name, arg)) {
+ *prop_ret = prop;
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+static int get_fsid(const char *path, u8 *fsid)
+{
+ int ret;
+ int fd;
+ struct btrfs_ioctl_fs_info_args args;
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ ret = -errno;
+ fprintf(stderr, "ERROR: open %s failed. %s\n", path,
+ strerror(-ret));
+ goto out;
+ }
+
+ ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
+ if (ret < 0) {
+ ret = -errno;
+ goto out;
+ }
+
+ memcpy(fsid, args.fsid, BTRFS_FSID_SIZE);
+ ret = 0;
+
+out:
+ if (fd != -1)
+ close(fd);
+ return ret;
+}
+
+static int check_btrfs_object(const char *object)
+{
+ int ret;
+ u8 fsid[BTRFS_FSID_SIZE];
+
+ ret = get_fsid(object, fsid);
+ if (ret < 0)
+ ret = 0;
+ else
+ ret = 1;
+ return ret;
+}
+
+static int check_is_root(const char *object)
+{
+ int ret;
+ u8 fsid[BTRFS_FSID_SIZE];
+ u8 fsid2[BTRFS_FSID_SIZE];
+ char *tmp;
+
+ tmp = malloc(strlen(object) + 5);
+ if (!tmp) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ strcpy(tmp, object);
+ if (tmp[strlen(tmp) - 1] != '/')
+ strcat(tmp, "/");
+ strcat(tmp, "..");
+
+ ret = get_fsid(object, fsid);
+ if (ret < 0) {
+ fprintf(stderr, "ERROR: get_fsid for %s failed. %s\n", object,
+ strerror(-ret));
+ goto out;
+ }
+
+ ret = get_fsid(tmp, fsid2);
+ if (ret < 0) {
+ ret = 0;
+ goto out;
+ }
+
+ if (!memcmp(fsid, fsid2, BTRFS_FSID_SIZE)) {
+ ret = 0;
+ goto out;
+ }
+
+ ret = 1;
+
+out:
+ free(tmp);
+ return ret;
+}
+
+static int count_bits(int v)
+{
+ unsigned int tmp = (unsigned int)v;
+ int cnt = 0;
+
+ while (tmp) {
+ if (tmp & 1)
+ cnt++;
+ tmp >>= 1;
+ }
+ return cnt;
+}
+
+static int autodetect_object_types(const char *object, int *types_out)
+{
+ int ret;
+ int is_btrfs_object;
+ int types = 0;
+ struct stat st;
+
+ is_btrfs_object = check_btrfs_object(object);
+
+ ret = lstat(object, &st);
+ if (ret < 0) {
+ ret = -errno;
+ goto out;
+ }
+
+ if (is_btrfs_object) {
+ types |= prop_object_inode;
+ if (st.st_ino == BTRFS_FIRST_FREE_OBJECTID)
+ types |= prop_object_subvol;
+
+ ret = check_is_root(object);
+ if (ret < 0)
+ goto out;
+ if (ret)
+ types |= prop_object_root;
+ }
+
+ if (S_ISBLK(st.st_mode))
+ types |= prop_object_dev;
+
+ ret = 0;
+ *types_out = types;
+
+out:
+ return ret;
+}
+
+static int print_prop_help(const struct prop_handler *prop)
+{
+ fprintf(stdout, "%-20s%s\n", prop->name, prop->desc);
+ return 0;
+}
+
+static int dump_prop(const struct prop_handler *prop,
+ const char *object,
+ int types,
+ int type,
+ int name_and_help)
+{
+ int ret = 0;
+
+ if ((types & type) && (prop->types & type)) {
+ if (!name_and_help)
+ ret = prop->handler(type, object, prop->name, NULL);
+ else
+ ret = print_prop_help(prop);
+ }
+ return ret;
+}
+
+static int dump_props(int types, const char *object, int name_and_help)
+{
+ int ret;
+ int i;
+ int j;
+ const struct prop_handler *prop;
+
+ for (i = 0; prop_handlers[i].name; i++) {
+ prop = &prop_handlers[i];
+ for (j = 1; j < __prop_object_max; j <<= 1) {
+ ret = dump_prop(prop, object, types, j, name_and_help);
+ if (ret < 0) {
+ ret = 50;
+ goto out;
+ }
+ }
+ }
+
+ ret = 0;
+
+out:
+ return ret;
+}
+
+static int setget_prop(int types, const char *object,
+ const char *name, const char *value)
+{
+ int ret;
+ const struct prop_handler *prop = NULL;
+
+ ret = parse_prop(name, prop_handlers, &prop);
+ if (ret == -1) {
+ fprintf(stderr, "ERROR: property is unknown\n");
+ ret = 40;
+ goto out;
+ } else if (ret) {
+ fprintf(stderr, "ERROR: parse_prop reported unknown error\n");
+ ret = 42;
+ goto out;
+ }
+
+ types &= prop->types;
+ if (!types) {
+ fprintf(stderr,
+ "ERROR: object is not compatible with property\n");
+ ret = 47;
+ goto out;
+ }
+
+ if (count_bits(types) > 1) {
+ fprintf(stderr,
+ "ERROR: type of object is ambiguous. Please specify a type by hand.\n");
+ ret = 48;
+ goto out;
+ }
+
+ if (value && prop->read_only) {
+ fprintf(stderr, "ERROR: %s is a read-only property.\n",
+ prop->name);
+ ret = 51;
+ goto out;
+ }
+
+ ret = prop->handler(types, object, name, value);
+
+ if (ret < 0)
+ ret = 50;
+ else
+ ret = 0;
+
+out:
+ return ret;
+
+}
+
+static void parse_args(int argc, char **argv,
+ const char * const *usage_str,
+ int *types, char **object,
+ char **name, char **value)
+{
+ int ret;
+ char *type_str = NULL;
+
+ optind = 1;
+ while (1) {
+ int c = getopt(argc, argv, "t:");
+ if (c < 0)
+ break;
+
+ switch (c) {
+ case 't':
+ type_str = optarg;
+ break;
+ default:
+ usage(usage_str);
+ break;
+ }
+ }
+
+ *types = 0;
+ if (type_str) {
+ if (!strcmp(type_str, "s") || !strcmp(type_str, "subvol")) {
+ *types = prop_object_subvol;
+ } else if (!strcmp(type_str, "f") ||
+ !strcmp(type_str, "filesystem")) {
+ *types = prop_object_root;
+ } else if (!strcmp(type_str, "i") ||
+ !strcmp(type_str, "inode")) {
+ *types = prop_object_inode;
+ } else if (!strcmp(type_str, "d") ||
+ !strcmp(type_str, "device")) {
+ *types = prop_object_dev;
+ } else {
+ fprintf(stderr, "ERROR: invalid object type.\n");
+ usage(usage_str);
+ }
+ }
+
+ if (object && optind < argc)
+ *object = argv[optind++];
+ if (name && optind < argc)
+ *name = argv[optind++];
+ if (value && optind < argc)
+ *value = argv[optind++];
+
+ if (optind != argc) {
+ fprintf(stderr, "ERROR: invalid arguments.\n");
+ usage(usage_str);
+ }
+
+ if (!*types && object && *object) {
+ ret = autodetect_object_types(*object, types);
+ if (ret < 0) {
+ fprintf(stderr,
+ "ERROR: failed to detect object type. %s\n",
+ strerror(-ret));
+ usage(usage_str);
+ }
+ if (!*types) {
+ fprintf(stderr,
+ "ERROR: object is not a btrfs object.\n");
+ usage(usage_str);
+ }
+ }
+}
+
+static int cmd_get(int argc, char **argv)
+{
+ int ret;
+ char *object;
+ char *name = NULL;
+ int types = 0;
+
+ if (check_argc_min(argc, 2) || check_argc_max(argc, 4))
+ usage(cmd_get_usage);
+
+ parse_args(argc, argv, cmd_get_usage, &types, &object, &name, NULL);
+ if (!object) {
+ fprintf(stderr, "ERROR: invalid arguments.\n");
+ usage(cmd_set_usage);
+ }
+
+ if (name)
+ ret = setget_prop(types, object, name, NULL);
+ else
+ ret = dump_props(types, object, 0);
+
+ return ret;
+}
+
+static int cmd_set(int argc, char **argv)
+{
+ int ret;
+ char *object;
+ char *name;
+ char *value;
+ int types = 0;
+
+ if (check_argc_min(argc, 4) || check_argc_max(argc, 5))
+ usage(cmd_set_usage);
+
+ parse_args(argc, argv, cmd_set_usage, &types, &object, &name, &value);
+ if (!object || !name || !value) {
+ fprintf(stderr, "ERROR: invalid arguments.\n");
+ usage(cmd_set_usage);
+ }
+
+ ret = setget_prop(types, object, name, value);
+
+ return ret;
+}
+
+static int cmd_list(int argc, char **argv)
+{
+ int ret;
+ char *object = NULL;
+ int types = 0;
+
+ if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
+ usage(cmd_list_usage);
+
+ parse_args(argc, argv, cmd_list_usage, &types, &object, NULL, NULL);
+ if (!object) {
+ fprintf(stderr, "ERROR: invalid arguments.\n");
+ usage(cmd_set_usage);
+ }
+
+ ret = dump_props(types, object, 1);
+
+ return ret;
+}
+
+const struct cmd_group property_cmd_group = {
+ property_cmd_group_usage, NULL, {
+ { "get", cmd_get, cmd_get_usage, NULL, 0 },
+ { "set", cmd_set, cmd_set_usage, NULL, 0 },
+ { "list", cmd_list, cmd_list_usage, NULL, 0 },
+ { 0, 0, 0, 0, 0 },
+ }
+};
+
+int cmd_property(int argc, char **argv)
+{
+ return handle_command_group(&property_cmd_group, argc, argv);
+}
--- /dev/null
+/*
+ * 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.
+ */
+
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "ctree.h"
+#include "commands.h"
+#include "utils.h"
+#include "props.h"
+
+static int prop_read_only(enum prop_object_type type,
+ const char *object,
+ const char *name,
+ const char *value)
+{
+ int ret = 0;
+ int fd = -1;
+ u64 flags = 0;
+
+ fd = open(object, O_RDONLY);
+ if (fd < 0) {
+ ret = -errno;
+ fprintf(stderr, "ERROR: open %s failed. %s\n",
+ object, strerror(-ret));
+ goto out;
+ }
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+ if (ret < 0) {
+ ret = -errno;
+ fprintf(stderr, "ERROR: failed to get flags for %s. %s\n",
+ object, strerror(-ret));
+ goto out;
+ }
+
+ if (!value) {
+ if (flags & BTRFS_SUBVOL_RDONLY)
+ fprintf(stdout, "ro=true\n");
+ else
+ fprintf(stdout, "ro=false\n");
+ ret = 0;
+ goto out;
+ }
+
+ if (!strcmp(value, "true")) {
+ flags |= BTRFS_SUBVOL_RDONLY;
+ } else if (!strcmp(value, "false")) {
+ flags = flags & ~BTRFS_SUBVOL_RDONLY;
+ } else {
+ ret = -EINVAL;
+ fprintf(stderr, "ERROR: invalid value for property.\n");
+ goto out;
+ }
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &flags);
+ if (ret < 0) {
+ ret = -errno;
+ fprintf(stderr, "ERROR: failed to set flags for %s. %s\n",
+ object, strerror(-ret));
+ goto out;
+ }
+
+out:
+ if (fd != -1)
+ close(fd);
+ return ret;
+}
+
+static int prop_label(enum prop_object_type type,
+ const char *object,
+ const char *name,
+ const char *value)
+{
+ int ret;
+
+ if (value) {
+ ret = set_label((char *) object, (char *) value);
+ } else {
+ char label[BTRFS_LABEL_SIZE];
+
+ ret = get_label((char *) object, label);
+ if (!ret)
+ fprintf(stdout, "label=%s\n", label);
+ }
+
+ return ret;
+}
+
+const struct prop_handler prop_handlers[] = {
+ {"ro", "Set/get read-only flag of subvolume.", 0, prop_object_subvol,
+ prop_read_only},
+ {"label", "Set/get label of device.", 0, prop_object_dev, prop_label},
+ {0, 0, 0, 0, 0}
+};
projects / platform / upstream / btrfs-progs.git / commitdiff