mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-09 08:00:13 +00:00
e4df433b8a
As btrfs is specific to Linux, %m can be used instead of strerror(errno) in format strings. This has some size reduction benefits for embedded systems. glibc, musl, and uclibc-ng all support %m as a modifier to printf. A quick glance at the BIONIC libc source indicates that it has support for %m as well. BSDs and Windows do not but I do believe them to be beyond the scope of btrfs-progs. Compiled sizes on Ubuntu 16.04: Before: 3916512 btrfs 233688 libbtrfs.so.0.1 4899 bcp 2367672 btrfs-convert 2208488 btrfs-corrupt-block 13302 btrfs-debugfs 2152160 btrfs-debug-tree 2136024 btrfs-find-root 2287592 btrfs-image 2144600 btrfs-map-logical 2130760 btrfs-select-super 2152608 btrfstune 2131760 btrfs-zero-log 2277752 mkfs.btrfs 9166 show-blocks After: 3908744 btrfs 233256 libbtrfs.so.0.1 4899 bcp 2366560 btrfs-convert 2207432 btrfs-corrupt-block 13302 btrfs-debugfs 2151104 btrfs-debug-tree 2134968 btrfs-find-root 2281864 btrfs-image 2143536 btrfs-map-logical 2129704 btrfs-select-super 2151552 btrfstune 2130696 btrfs-zero-log 2276272 mkfs.btrfs 9166 show-blocks Total savings: 23928 (24 kilo)bytes Signed-off-by: Rosen Penev <rosenp@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
210 lines
4.8 KiB
C
210 lines
4.8 KiB
C
/*
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* Copyright (C) 2012 STRATO. All rights reserved.
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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 <sys/ioctl.h>
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#include <unistd.h>
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#include "ctree.h"
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#include "ioctl.h"
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#include "commands.h"
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#include "utils.h"
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#include "help.h"
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static const char * const quota_cmd_group_usage[] = {
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"btrfs quota <command> [options] <path>",
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NULL
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};
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static int quota_ctl(int cmd, int argc, char **argv)
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{
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int ret = 0;
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int fd;
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char *path = argv[1];
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struct btrfs_ioctl_quota_ctl_args args;
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DIR *dirstream = NULL;
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if (check_argc_exact(argc, 2))
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return -1;
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memset(&args, 0, sizeof(args));
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args.cmd = cmd;
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fd = btrfs_open_dir(path, &dirstream, 1);
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if (fd < 0)
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return 1;
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ret = ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args);
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close_file_or_dir(fd, dirstream);
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if (ret < 0) {
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error("quota command failed: %m");
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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 const char * const cmd_quota_enable_usage[] = {
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"btrfs quota enable <path>",
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"Enable subvolume quota support for a filesystem.",
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"Any data already present on the filesystem will not count towards",
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"the space usage numbers. It is recommended to enable quota for a",
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"filesystem before writing any data to it.",
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NULL
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};
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static int cmd_quota_enable(int argc, char **argv)
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{
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int ret;
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clean_args_no_options(argc, argv, cmd_quota_enable_usage);
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ret = quota_ctl(BTRFS_QUOTA_CTL_ENABLE, argc, argv);
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if (ret < 0)
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usage(cmd_quota_enable_usage);
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return ret;
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}
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static const char * const cmd_quota_disable_usage[] = {
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"btrfs quota disable <path>",
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"Disable subvolume quota support for a filesystem.",
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NULL
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};
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static int cmd_quota_disable(int argc, char **argv)
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{
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int ret;
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clean_args_no_options(argc, argv, cmd_quota_disable_usage);
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ret = quota_ctl(BTRFS_QUOTA_CTL_DISABLE, argc, argv);
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if (ret < 0)
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usage(cmd_quota_disable_usage);
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return ret;
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}
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static const char * const cmd_quota_rescan_usage[] = {
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"btrfs quota rescan [-sw] <path>",
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"Trash all qgroup numbers and scan the metadata again with the current config.",
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"",
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"-s show status of a running rescan operation",
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"-w wait for rescan operation to finish (can be already in progress)",
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NULL
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};
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static int cmd_quota_rescan(int argc, char **argv)
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{
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int ret = 0;
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int fd;
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int e;
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char *path = NULL;
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struct btrfs_ioctl_quota_rescan_args args;
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unsigned long ioctlnum = BTRFS_IOC_QUOTA_RESCAN;
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DIR *dirstream = NULL;
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int wait_for_completion = 0;
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while (1) {
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int c = getopt(argc, argv, "sw");
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if (c < 0)
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break;
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switch (c) {
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case 's':
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ioctlnum = BTRFS_IOC_QUOTA_RESCAN_STATUS;
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break;
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case 'w':
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wait_for_completion = 1;
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break;
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default:
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usage(cmd_quota_rescan_usage);
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}
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}
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if (ioctlnum != BTRFS_IOC_QUOTA_RESCAN && wait_for_completion) {
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error("switch -w cannot be used with -s");
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return 1;
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}
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if (check_argc_exact(argc - optind, 1))
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usage(cmd_quota_rescan_usage);
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memset(&args, 0, sizeof(args));
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path = argv[optind];
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fd = btrfs_open_dir(path, &dirstream, 1);
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if (fd < 0)
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return 1;
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ret = ioctl(fd, ioctlnum, &args);
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e = errno;
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if (ioctlnum == BTRFS_IOC_QUOTA_RESCAN_STATUS) {
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close_file_or_dir(fd, dirstream);
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if (ret < 0) {
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error("could not obtain quota rescan status: %m");
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return 1;
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}
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if (!args.flags)
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printf("no rescan operation in progress\n");
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else
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printf("rescan operation running (current key %lld)\n",
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args.progress);
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return 0;
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}
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if (ret == 0) {
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printf("quota rescan started\n");
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fflush(stdout);
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} else if (ret < 0 && (!wait_for_completion || e != EINPROGRESS)) {
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error("quota rescan failed: %m");
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close_file_or_dir(fd, dirstream);
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return 1;
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}
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if (wait_for_completion) {
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ret = ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_WAIT, &args);
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e = errno;
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if (ret < 0) {
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error("quota rescan wait failed: %m");
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close_file_or_dir(fd, dirstream);
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return 1;
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}
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}
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close_file_or_dir(fd, dirstream);
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return 0;
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}
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static const char quota_cmd_group_info[] =
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"manage filesystem quota settings";
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const struct cmd_group quota_cmd_group = {
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quota_cmd_group_usage, quota_cmd_group_info, {
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{ "enable", cmd_quota_enable, cmd_quota_enable_usage, NULL, 0 },
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{ "disable", cmd_quota_disable, cmd_quota_disable_usage,
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NULL, 0 },
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{ "rescan", cmd_quota_rescan, cmd_quota_rescan_usage, NULL, 0 },
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NULL_CMD_STRUCT
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}
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};
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int cmd_quota(int argc, char **argv)
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{
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return handle_command_group("a_cmd_group, argc, argv);
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}
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