btrfs-progs/qgroup.c

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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 "qgroup.h"
#include "ctree.h"
u64 parse_qgroupid(char *p)
{
char *s = strchr(p, '/');
u64 level;
u64 id;
if (!s)
return atoll(p);
level = atoll(p);
id = atoll(s + 1);
return (level << 48) | id;
}
int qgroup_inherit_size(struct btrfs_qgroup_inherit *p)
{
return sizeof(*p) + sizeof(p->qgroups[0]) *
(p->num_qgroups + 2 * p->num_ref_copies +
2 * p->num_excl_copies);
}
int qgroup_inherit_realloc(struct btrfs_qgroup_inherit **inherit, int n,
int pos)
{
struct btrfs_qgroup_inherit *out;
int nitems = 0;
if (*inherit) {
nitems = (*inherit)->num_qgroups +
(*inherit)->num_ref_copies +
(*inherit)->num_excl_copies;
}
out = calloc(sizeof(*out) + sizeof(out->qgroups[0]) * (nitems + n), 1);
if (out == NULL) {
fprintf(stderr, "ERROR: Not enough memory\n");
return 13;
}
if (*inherit) {
struct btrfs_qgroup_inherit *i = *inherit;
int s = sizeof(out->qgroups);
out->num_qgroups = i->num_qgroups;
out->num_ref_copies = i->num_ref_copies;
out->num_excl_copies = i->num_excl_copies;
memcpy(out->qgroups, i->qgroups, pos * s);
memcpy(out->qgroups + pos + n, i->qgroups + pos,
(nitems - pos) * s);
}
free(*inherit);
*inherit = out;
return 0;
}
int qgroup_inherit_add_group(struct btrfs_qgroup_inherit **inherit, char *arg)
{
int ret;
u64 qgroupid = parse_qgroupid(arg);
int pos = 0;
if (qgroupid == 0) {
fprintf(stderr, "ERROR: bad qgroup specification\n");
return 12;
}
if (*inherit)
pos = (*inherit)->num_qgroups;
ret = qgroup_inherit_realloc(inherit, 1, pos);
if (ret)
return ret;
(*inherit)->qgroups[(*inherit)->num_qgroups++] = qgroupid;
return 0;
}
int qgroup_inherit_add_copy(struct btrfs_qgroup_inherit **inherit, char *arg,
int type)
{
int ret;
u64 qgroup_src;
u64 qgroup_dst;
char *p;
int pos = 0;
p = strchr(arg, ':');
if (!p) {
bad:
fprintf(stderr, "ERROR: bad copy specification\n");
return 12;
}
*p = 0;
qgroup_src = parse_qgroupid(arg);
qgroup_dst = parse_qgroupid(p + 1);
*p = ':';
if (!qgroup_src || !qgroup_dst)
goto bad;
if (*inherit)
pos = (*inherit)->num_qgroups +
(*inherit)->num_ref_copies * 2 * type;
ret = qgroup_inherit_realloc(inherit, 2, pos);
if (ret)
return ret;
(*inherit)->qgroups[pos++] = qgroup_src;
(*inherit)->qgroups[pos++] = qgroup_dst;
if (!type)
++(*inherit)->num_ref_copies;
else
++(*inherit)->num_excl_copies;
return 0;
}