From 85be2aaf913f0e234058c56fab460c5d7a2c084b Mon Sep 17 00:00:00 2001 From: Alexander Block Date: Tue, 12 Nov 2013 13:41:43 +0000 Subject: Btrfs-progs: introduce btrfs property subgroup "btrfs filesystem property" is a generic interface to set/get properties on filesystem objects (inodes/subvolumes/filesystems /devs). This patch adds the generic framework for properties and also implements two properties. The first is the read-only property for subvolumes and the second is the label property for devices. Signed-off-by: Alexander Block Signed-off-by: Filipe David Borba Manana Signed-off-by: David Sterba Signed-off-by: Chris Mason --- props.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 props.c (limited to 'props.c') diff --git a/props.c b/props.c new file mode 100644 index 00000000..763fd57e --- /dev/null +++ b/props.c @@ -0,0 +1,110 @@ +/* + * 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 +#include +#include +#include + +#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} +}; -- cgit v1.2.3