btrfs-progs/cmds-qgroup.c

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/*
* Copyright (C) 2012 STRATO. 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.
*/
#include <sys/ioctl.h>
#include <unistd.h>
#include <getopt.h>
#include "ctree.h"
#include "ioctl.h"
#include "commands.h"
#include "qgroup.h"
#include "utils.h"
static const char * const qgroup_cmd_group_usage[] = {
"btrfs qgroup <command> [options] <path>",
NULL
};
static int qgroup_assign(int assign, int argc, char **argv)
{
int ret = 0;
int fd;
int e;
char *path = argv[3];
struct btrfs_ioctl_qgroup_assign_args args;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 4))
return -1;
memset(&args, 0, sizeof(args));
args.assign = assign;
args.src = parse_qgroupid(argv[1]);
args.dst = parse_qgroupid(argv[2]);
/*
* FIXME src should accept subvol path
*/
if ((args.src >> 48) >= (args.dst >> 48)) {
fprintf(stderr, "ERROR: bad relation requested '%s'\n", path);
return 1;
}
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
ret = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0) {
fprintf(stderr, "ERROR: unable to assign quota group: %s\n",
strerror(e));
return 1;
}
return 0;
}
static int qgroup_create(int create, int argc, char **argv)
{
int ret = 0;
int fd;
int e;
char *path = argv[2];
struct btrfs_ioctl_qgroup_create_args args;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 3))
return -1;
memset(&args, 0, sizeof(args));
args.create = create;
args.qgroupid = parse_qgroupid(argv[1]);
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
ret = ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0) {
fprintf(stderr, "ERROR: unable to create quota group: %s\n",
strerror(e));
return 1;
}
return 0;
}
static int parse_limit(const char *p, unsigned long long *s)
{
char *endptr;
unsigned long long size;
if (strcasecmp(p, "none") == 0) {
*s = 0;
return 1;
}
size = strtoull(p, &endptr, 10);
switch (*endptr) {
case 'T':
case 't':
size *= 1024;
case 'G':
case 'g':
size *= 1024;
case 'M':
case 'm':
size *= 1024;
case 'K':
case 'k':
size *= 1024;
++endptr;
break;
case 0:
break;
default:
return 0;
}
if (*endptr)
return 0;
*s = size;
return 1;
}
static const char * const cmd_qgroup_assign_usage[] = {
"btrfs qgroup assign <src> <dst> <path>",
"Enable subvolume qgroup support for a filesystem.",
NULL
};
static int cmd_qgroup_assign(int argc, char **argv)
{
int ret = qgroup_assign(1, argc, argv);
if (ret < 0)
usage(cmd_qgroup_assign_usage);
return ret;
}
static const char * const cmd_qgroup_remove_usage[] = {
"btrfs qgroup remove <src> <dst> <path>",
"Remove a subvol from a quota group.",
NULL
};
static int cmd_qgroup_remove(int argc, char **argv)
{
int ret = qgroup_assign(0, argc, argv);
if (ret < 0)
usage(cmd_qgroup_remove_usage);
return ret;
}
static const char * const cmd_qgroup_create_usage[] = {
"btrfs qgroup create <qgroupid> <path>",
"Create a subvolume quota group.",
NULL
};
static int cmd_qgroup_create(int argc, char **argv)
{
int ret = qgroup_create(1, argc, argv);
if (ret < 0)
usage(cmd_qgroup_create_usage);
return ret;
}
static const char * const cmd_qgroup_destroy_usage[] = {
"btrfs qgroup destroy <qgroupid> <path>",
"Destroy a subvolume quota group.",
NULL
};
static int cmd_qgroup_destroy(int argc, char **argv)
{
int ret = qgroup_create(0, argc, argv);
if (ret < 0)
usage(cmd_qgroup_destroy_usage);
return ret;
}
static const char * const cmd_qgroup_show_usage[] = {
"btrfs qgroup show -p <path>",
"Show all subvolume quota groups.",
"-p print parent qgroup id",
NULL
};
static int cmd_qgroup_show(int argc, char **argv)
{
char *path;
int ret = 0;
int fd;
int e;
DIR *dirstream = NULL;
int c;
optind = 1;
while (1) {
c = getopt(argc, argv, "p");
if (c < 0)
break;
switch (c) {
case 'p':
btrfs_qgroup_setup_print_column(
BTRFS_QGROUP_PARENT);
break;
default:
usage(cmd_qgroup_show_usage);
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_qgroup_show_usage);
path = argv[optind];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
Btrfs-progs: restructure show_qgroups The current show_qgroups() just shows a little information, and it is hard to add some functions which the users need in the future, so i restructure it, make it easy to add new functions. In order to improve the scalability of show_qgroups(), i add some important structures: struct qgroup_lookup { struct rb_root root; } /* *store qgroup's information */ struct btrfs_qgroup { struct rb_node rb_node; u64 qgroupid; u64 generation; u64 rfer; u64 rfer_cmpr; u64 excl_cmpr; u64 flags; u64 max_rfer; u64 max_excl; u64 rsv_rfer; u64 rsv_excl; struct list_head qgroups; struct list_head members; } /* *glue structure to represent the relations *between qgroups */ struct btrfs_qgroup_list { struct list_head next_qgroups; struct list_head next_member; struct btrfs_qgroup *qgroup; struct btrfs_qgroup *member; } The above 3 structures are used to manage all the information of qgroups. struct { char *name; char *column_name; int need_print; } btrfs_qgroup_columns[] We define a arrary to manage all the columns that can be outputed, and use a member variant(->need_print) to control the output of the relative column. Some columns are outputed by default. But we can change it according to the requirement of the users. For example: if outputing max referenced size of qgroup is needed,the function 'btrfs_qgroup_setup_column()' will be called, and the parameter 'BTRFS_QGROUP_MAX_RFER' (extend in the future) will be passsed to the function. After the function is done, when showing qgroups, max referenced size of qgroup will be output. Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-10-07 07:21:37 +00:00
ret = btrfs_show_qgroups(fd);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0)
fprintf(stderr, "ERROR: can't list qgroups: %s\n",
strerror(e));
return !!ret;
}
static const char * const cmd_qgroup_limit_usage[] = {
"btrfs qgroup limit [options] <size>|none [<qgroupid>] <path>",
"Limit the size of a subvolume quota group.",
"",
"-c limit amount of data after compression. This is the default,",
" it is currently not possible to turn off this option.",
"-e limit space exclusively assigned to this qgroup",
NULL
};
static int cmd_qgroup_limit(int argc, char **argv)
{
int ret = 0;
int fd;
int e;
char *path = NULL;
struct btrfs_ioctl_qgroup_limit_args args;
unsigned long long size;
int compressed = 0;
int exclusive = 0;
DIR *dirstream = NULL;
optind = 1;
while (1) {
int c = getopt(argc, argv, "ce");
if (c < 0)
break;
switch (c) {
case 'c':
compressed = 1;
break;
case 'e':
exclusive = 1;
break;
default:
usage(cmd_qgroup_limit_usage);
}
}
if (check_argc_min(argc - optind, 2))
usage(cmd_qgroup_limit_usage);
if (!parse_limit(argv[optind], &size)) {
fprintf(stderr, "Invalid size argument given\n");
return 1;
}
memset(&args, 0, sizeof(args));
if (size) {
if (compressed)
args.lim.flags |= BTRFS_QGROUP_LIMIT_RFER_CMPR |
BTRFS_QGROUP_LIMIT_EXCL_CMPR;
if (exclusive) {
args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_EXCL;
args.lim.max_exclusive = size;
} else {
args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_RFER;
args.lim.max_referenced = size;
}
}
if (argc - optind == 2) {
args.qgroupid = 0;
path = argv[optind + 1];
ret = test_issubvolume(path);
if (ret < 0) {
fprintf(stderr, "ERROR: error accessing '%s'\n", path);
return 1;
}
if (!ret) {
fprintf(stderr, "ERROR: '%s' is not a subvolume\n",
path);
return 1;
}
/*
* keep qgroupid at 0, this indicates that the subvolume the
* fd refers to is to be limited
*/
} else if (argc - optind == 3) {
args.qgroupid = parse_qgroupid(argv[optind + 1]);
path = argv[optind + 2];
} else
usage(cmd_qgroup_limit_usage);
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
ret = ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0) {
fprintf(stderr, "ERROR: unable to limit requested quota group: "
"%s\n", strerror(e));
return 1;
}
return 0;
}
const struct cmd_group qgroup_cmd_group = {
qgroup_cmd_group_usage, NULL, {
{ "assign", cmd_qgroup_assign, cmd_qgroup_assign_usage,
NULL, 0 },
{ "remove", cmd_qgroup_remove, cmd_qgroup_remove_usage,
NULL, 0 },
{ "create", cmd_qgroup_create, cmd_qgroup_create_usage,
NULL, 0 },
{ "destroy", cmd_qgroup_destroy, cmd_qgroup_destroy_usage,
NULL, 0 },
{ "show", cmd_qgroup_show, cmd_qgroup_show_usage,
NULL, 0 },
{ "limit", cmd_qgroup_limit, cmd_qgroup_limit_usage,
NULL, 0 },
NULL_CMD_STRUCT
}
};
int cmd_qgroup(int argc, char **argv)
{
return handle_command_group(&qgroup_cmd_group, argc, argv);
}