btrfs-progs: factor filesystem helpers out of utils.c
Group helpers that retrieve information from the filesystem out of utils.c. Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
parent
eac3cb577c
commit
d04a1fa10e
1
Makefile
1
Makefile
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@ -174,6 +174,7 @@ objects = \
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common/device-scan.o \
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common/device-utils.o \
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common/extent-cache.o \
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common/filesystem-utils.o \
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common/format-output.o \
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common/fsfeatures.o \
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common/help.o \
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@ -43,6 +43,7 @@
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#include "common/device-utils.h"
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#include "common/open-utils.h"
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#include "common/parse-utils.h"
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#include "common/filesystem-utils.h"
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#include "cmds/commands.h"
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#include "cmds/filesystem-usage.h"
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@ -28,6 +28,7 @@
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#include "common/open-utils.h"
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#include "common/utils.h"
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#include "common/help.h"
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#include "common/filesystem-utils.h"
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#include "cmds/commands.h"
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#include "cmds/props.h"
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@ -0,0 +1,217 @@
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "kernel-shared/ctree.h"
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#include "kernel-shared/disk-io.h"
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#include "kernel-shared/transaction.h"
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#include "common/filesystem-utils.h"
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#include "common/messages.h"
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#include "common/open-utils.h"
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#include "common/path-utils.h"
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#include "ioctl.h"
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/*
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* For a given:
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* - file or directory return the containing tree root id
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* - subvolume return its own tree id
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* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
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* undefined and function returns -1
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*/
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int lookup_path_rootid(int fd, u64 *rootid)
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{
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struct btrfs_ioctl_ino_lookup_args args;
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int ret;
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memset(&args, 0, sizeof(args));
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args.treeid = 0;
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args.objectid = BTRFS_FIRST_FREE_OBJECTID;
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ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
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if (ret < 0)
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return -errno;
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*rootid = args.treeid;
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return 0;
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}
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/*
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* Checks to make sure that the label matches our requirements.
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* Returns:
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0 if everything is safe and usable
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-1 if the label is too long
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*/
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static int check_label(const char *input)
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{
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int len = strlen(input);
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if (len > BTRFS_LABEL_SIZE - 1) {
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error("label %s is too long (max %d)", input,
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BTRFS_LABEL_SIZE - 1);
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return -1;
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}
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return 0;
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}
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static int set_label_unmounted(const char *dev, const char *label)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root;
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int ret;
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ret = check_mounted(dev);
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if (ret < 0) {
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error("checking mount status of %s failed: %d", dev, ret);
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return -1;
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}
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if (ret > 0) {
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error("device %s is mounted, use mount point", dev);
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return -1;
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}
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/* Open the super_block at the default location
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* and as read-write.
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*/
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root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
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if (!root) /* errors are printed by open_ctree() */
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return -1;
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trans = btrfs_start_transaction(root, 1);
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BUG_ON(IS_ERR(trans));
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__strncpy_null(root->fs_info->super_copy->label, label, BTRFS_LABEL_SIZE - 1);
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btrfs_commit_transaction(trans, root);
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/* Now we close it since we are done. */
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close_ctree(root);
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return 0;
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}
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static int set_label_mounted(const char *mount_path, const char *labelp)
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{
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int fd;
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char label[BTRFS_LABEL_SIZE];
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fd = open(mount_path, O_RDONLY | O_NOATIME);
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if (fd < 0) {
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error("unable to access %s: %m", mount_path);
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return -1;
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}
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memset(label, 0, sizeof(label));
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__strncpy_null(label, labelp, BTRFS_LABEL_SIZE - 1);
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if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
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error("unable to set label of %s: %m", mount_path);
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close(fd);
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return -1;
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}
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close(fd);
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return 0;
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}
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int get_label_unmounted(const char *dev, char *label)
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{
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struct btrfs_root *root;
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int ret;
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ret = check_mounted(dev);
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if (ret < 0) {
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error("checking mount status of %s failed: %d", dev, ret);
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return -1;
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}
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/* Open the super_block at the default location
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* and as read-only.
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*/
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root = open_ctree(dev, 0, 0);
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if(!root)
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return -1;
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__strncpy_null(label, root->fs_info->super_copy->label,
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BTRFS_LABEL_SIZE - 1);
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/* Now we close it since we are done. */
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close_ctree(root);
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return 0;
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}
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/*
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* If a partition is mounted, try to get the filesystem label via its
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* mounted path rather than device. Return the corresponding error
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* the user specified the device path.
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*/
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int get_label_mounted(const char *mount_path, char *labelp)
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{
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char label[BTRFS_LABEL_SIZE];
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int fd;
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int ret;
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fd = open(mount_path, O_RDONLY | O_NOATIME);
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if (fd < 0) {
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error("unable to access %s: %m", mount_path);
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return -1;
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}
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memset(label, '\0', sizeof(label));
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ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
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if (ret < 0) {
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if (errno != ENOTTY)
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error("unable to get label of %s: %m", mount_path);
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ret = -errno;
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close(fd);
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return ret;
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}
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__strncpy_null(labelp, label, BTRFS_LABEL_SIZE - 1);
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close(fd);
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return 0;
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}
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int get_label(const char *btrfs_dev, char *label)
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{
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int ret;
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ret = path_is_reg_or_block_device(btrfs_dev);
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if (!ret)
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ret = get_label_mounted(btrfs_dev, label);
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else if (ret > 0)
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ret = get_label_unmounted(btrfs_dev, label);
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return ret;
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}
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int set_label(const char *btrfs_dev, const char *label)
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{
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int ret;
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if (check_label(label))
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return -1;
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ret = path_is_reg_or_block_device(btrfs_dev);
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if (!ret)
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ret = set_label_mounted(btrfs_dev, label);
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else if (ret > 0)
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ret = set_label_unmounted(btrfs_dev, label);
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return ret;
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}
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@ -0,0 +1,26 @@
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_FILESYSTEM_UTILS_H__
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#define __BTRFS_FILESYSTEM_UTILS_H__
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int lookup_path_rootid(int fd, u64 *rootid);
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int get_label(const char *btrfs_dev, char *label);
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int set_label(const char *btrfs_dev, const char *label);
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int get_label_mounted(const char *mount_path, char *labelp);
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int get_label_unmounted(const char *dev, char *label);
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#endif
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188
common/utils.c
188
common/utils.c
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@ -63,169 +63,6 @@ struct pending_dir {
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char name[PATH_MAX];
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};
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/*
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* Checks to make sure that the label matches our requirements.
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* Returns:
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0 if everything is safe and usable
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-1 if the label is too long
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*/
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static int check_label(const char *input)
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{
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int len = strlen(input);
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if (len > BTRFS_LABEL_SIZE - 1) {
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error("label %s is too long (max %d)", input,
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BTRFS_LABEL_SIZE - 1);
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return -1;
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}
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return 0;
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}
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static int set_label_unmounted(const char *dev, const char *label)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root;
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int ret;
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ret = check_mounted(dev);
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if (ret < 0) {
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error("checking mount status of %s failed: %d", dev, ret);
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return -1;
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}
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if (ret > 0) {
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error("device %s is mounted, use mount point", dev);
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return -1;
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}
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/* Open the super_block at the default location
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* and as read-write.
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*/
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root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
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if (!root) /* errors are printed by open_ctree() */
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return -1;
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trans = btrfs_start_transaction(root, 1);
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BUG_ON(IS_ERR(trans));
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__strncpy_null(root->fs_info->super_copy->label, label, BTRFS_LABEL_SIZE - 1);
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btrfs_commit_transaction(trans, root);
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/* Now we close it since we are done. */
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close_ctree(root);
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return 0;
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}
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static int set_label_mounted(const char *mount_path, const char *labelp)
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{
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int fd;
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char label[BTRFS_LABEL_SIZE];
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fd = open(mount_path, O_RDONLY | O_NOATIME);
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if (fd < 0) {
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error("unable to access %s: %m", mount_path);
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return -1;
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}
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memset(label, 0, sizeof(label));
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__strncpy_null(label, labelp, BTRFS_LABEL_SIZE - 1);
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if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
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error("unable to set label of %s: %m", mount_path);
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close(fd);
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return -1;
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}
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close(fd);
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return 0;
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}
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int get_label_unmounted(const char *dev, char *label)
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{
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struct btrfs_root *root;
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int ret;
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ret = check_mounted(dev);
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if (ret < 0) {
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error("checking mount status of %s failed: %d", dev, ret);
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return -1;
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}
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/* Open the super_block at the default location
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* and as read-only.
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*/
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root = open_ctree(dev, 0, 0);
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if(!root)
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return -1;
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__strncpy_null(label, root->fs_info->super_copy->label,
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BTRFS_LABEL_SIZE - 1);
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/* Now we close it since we are done. */
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close_ctree(root);
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return 0;
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}
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/*
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* If a partition is mounted, try to get the filesystem label via its
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* mounted path rather than device. Return the corresponding error
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* the user specified the device path.
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*/
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int get_label_mounted(const char *mount_path, char *labelp)
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{
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char label[BTRFS_LABEL_SIZE];
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int fd;
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int ret;
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fd = open(mount_path, O_RDONLY | O_NOATIME);
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if (fd < 0) {
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error("unable to access %s: %m", mount_path);
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return -1;
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}
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memset(label, '\0', sizeof(label));
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ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
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if (ret < 0) {
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if (errno != ENOTTY)
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error("unable to get label of %s: %m", mount_path);
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ret = -errno;
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close(fd);
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return ret;
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}
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__strncpy_null(labelp, label, BTRFS_LABEL_SIZE - 1);
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close(fd);
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return 0;
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}
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int get_label(const char *btrfs_dev, char *label)
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{
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int ret;
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ret = path_is_reg_or_block_device(btrfs_dev);
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if (!ret)
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ret = get_label_mounted(btrfs_dev, label);
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else if (ret > 0)
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ret = get_label_unmounted(btrfs_dev, label);
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return ret;
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}
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int set_label(const char *btrfs_dev, const char *label)
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{
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int ret;
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if (check_label(label))
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return -1;
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ret = path_is_reg_or_block_device(btrfs_dev);
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if (!ret)
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ret = set_label_mounted(btrfs_dev, label);
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else if (ret > 0)
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ret = set_label_unmounted(btrfs_dev, label);
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return ret;
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}
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void btrfs_format_csum(u16 csum_type, const u8 *data, char *output)
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{
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int i;
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@ -1540,28 +1377,3 @@ out:
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return ret;
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}
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/*
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* For a given:
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* - file or directory return the containing tree root id
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* - subvolume return its own tree id
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* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
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* undefined and function returns -1
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*/
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int lookup_path_rootid(int fd, u64 *rootid)
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{
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struct btrfs_ioctl_ino_lookup_args args;
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int ret;
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memset(&args, 0, sizeof(args));
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args.treeid = 0;
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args.objectid = BTRFS_FIRST_FREE_OBJECTID;
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ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
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if (ret < 0)
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return -errno;
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*rootid = args.treeid;
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return 0;
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}
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@ -53,12 +53,7 @@ int get_fs_exclop(int fd);
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int check_running_fs_exclop(int fd, enum exclusive_operation start, bool enqueue);
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const char *get_fs_exclop_name(int op);
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int get_label(const char *btrfs_dev, char *label);
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int set_label(const char *btrfs_dev, const char *label);
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int check_arg_type(const char *input);
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int get_label_mounted(const char *mount_path, char *labelp);
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int get_label_unmounted(const char *dev, char *label);
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int ask_user(const char *question);
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int lookup_path_rootid(int fd, u64 *rootid);
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int find_mount_fsroot(const char *subvol, const char *subvolid, char **mount);
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