2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
|
* Quota code necessary even when VFS quota support is not compiled
|
|
|
|
|
* into the kernel. The interesting stuff is over in dquot.c, here
|
|
|
|
|
* we have symbols for initial quotactl(2) handling, the sysctl(2)
|
|
|
|
|
* variables, etc - things needed even when quota support disabled.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <linux/fs.h>
|
|
|
|
|
#include <linux/namei.h>
|
|
|
|
|
#include <linux/slab.h>
|
|
|
|
|
#include <asm/current.h>
|
2012-05-28 23:40:17 +08:00
|
|
|
#include <linux/uaccess.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/kernel.h>
|
|
|
|
|
#include <linux/security.h>
|
|
|
|
|
#include <linux/syscalls.h>
|
2006-01-12 04:17:46 +08:00
|
|
|
#include <linux/capability.h>
|
2005-11-07 16:59:35 +08:00
|
|
|
#include <linux/quotaops.h>
|
2007-07-16 14:41:12 +08:00
|
|
|
#include <linux/types.h>
|
2010-02-16 16:44:51 +08:00
|
|
|
#include <linux/writeback.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-16 16:44:50 +08:00
|
|
|
static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
|
|
|
|
|
qid_t id)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2010-02-16 16:44:50 +08:00
|
|
|
switch (cmd) {
|
|
|
|
|
/* these commands do not require any special privilegues */
|
|
|
|
|
case Q_GETFMT:
|
|
|
|
|
case Q_SYNC:
|
|
|
|
|
case Q_GETINFO:
|
|
|
|
|
case Q_XGETQSTAT:
|
2013-08-07 06:27:07 +08:00
|
|
|
case Q_XGETQSTATV:
|
2010-02-16 16:44:50 +08:00
|
|
|
case Q_XQUOTASYNC:
|
|
|
|
|
break;
|
|
|
|
|
/* allow to query information for dquots we "own" */
|
|
|
|
|
case Q_GETQUOTA:
|
|
|
|
|
case Q_XGETQUOTA:
|
2012-09-16 17:07:49 +08:00
|
|
|
if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) ||
|
|
|
|
|
(type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id))))
|
2010-02-16 16:44:50 +08:00
|
|
|
break;
|
|
|
|
|
/*FALLTHROUGH*/
|
|
|
|
|
default:
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
|
|
|
return -EPERM;
|
|
|
|
|
}
|
|
|
|
|
|
2010-02-16 16:44:50 +08:00
|
|
|
return security_quotactl(cmd, type, id, sb);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
2010-03-23 18:06:58 +08:00
|
|
|
static void quota_sync_one(struct super_block *sb, void *arg)
|
|
|
|
|
{
|
2014-09-30 16:43:09 +08:00
|
|
|
int type = *(int *)arg;
|
|
|
|
|
|
|
|
|
|
if (sb->s_qcop && sb->s_qcop->quota_sync &&
|
|
|
|
|
(sb->s_quota_types & (1 << type)))
|
|
|
|
|
sb->s_qcop->quota_sync(sb, type);
|
2010-03-23 18:06:58 +08:00
|
|
|
}
|
|
|
|
|
|
2010-02-16 16:44:49 +08:00
|
|
|
static int quota_sync_all(int type)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2010-02-16 16:44:49 +08:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (type >= MAXQUOTAS)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
ret = security_quotactl(Q_SYNC, type, 0, NULL);
|
2010-03-23 18:06:58 +08:00
|
|
|
if (!ret)
|
|
|
|
|
iterate_supers(quota_sync_one, &type);
|
|
|
|
|
return ret;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
|
2010-09-15 23:38:58 +08:00
|
|
|
struct path *path)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2010-09-15 23:38:58 +08:00
|
|
|
if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_on_meta)
|
|
|
|
|
return -ENOSYS;
|
|
|
|
|
if (sb->s_qcop->quota_on_meta)
|
|
|
|
|
return sb->s_qcop->quota_on_meta(sb, type, id);
|
|
|
|
|
if (IS_ERR(path))
|
|
|
|
|
return PTR_ERR(path);
|
|
|
|
|
return sb->s_qcop->quota_on(sb, type, id, path);
|
2010-02-16 16:44:47 +08:00
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
__u32 fmt;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2014-06-04 12:19:12 +08:00
|
|
|
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
2010-02-16 16:44:47 +08:00
|
|
|
if (!sb_has_quota_active(sb, type)) {
|
2014-06-04 12:19:12 +08:00
|
|
|
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
2010-02-16 16:44:47 +08:00
|
|
|
return -ESRCH;
|
|
|
|
|
}
|
|
|
|
|
fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
|
2014-06-04 12:19:12 +08:00
|
|
|
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
2010-02-16 16:44:47 +08:00
|
|
|
if (copy_to_user(addr, &fmt, sizeof(fmt)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
struct if_dqinfo info;
|
|
|
|
|
int ret;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-16 16:44:48 +08:00
|
|
|
if (!sb->s_qcop->get_info)
|
|
|
|
|
return -ENOSYS;
|
2010-02-16 16:44:47 +08:00
|
|
|
ret = sb->s_qcop->get_info(sb, type, &info);
|
|
|
|
|
if (!ret && copy_to_user(addr, &info, sizeof(info)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
struct if_dqinfo info;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
if (copy_from_user(&info, addr, sizeof(info)))
|
|
|
|
|
return -EFAULT;
|
2010-02-16 16:44:48 +08:00
|
|
|
if (!sb->s_qcop->set_info)
|
|
|
|
|
return -ENOSYS;
|
2010-02-16 16:44:47 +08:00
|
|
|
return sb->s_qcop->set_info(sb, type, &info);
|
|
|
|
|
}
|
|
|
|
|
|
2014-10-09 22:03:13 +08:00
|
|
|
static inline qsize_t qbtos(qsize_t blocks)
|
|
|
|
|
{
|
|
|
|
|
return blocks << QIF_DQBLKSIZE_BITS;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline qsize_t stoqb(qsize_t space)
|
|
|
|
|
{
|
|
|
|
|
return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
|
2010-05-07 05:04:58 +08:00
|
|
|
{
|
2013-11-01 18:21:54 +08:00
|
|
|
memset(dst, 0, sizeof(*dst));
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
|
|
|
|
|
dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
|
|
|
|
|
dst->dqb_curspace = src->d_space;
|
2010-05-07 05:04:58 +08:00
|
|
|
dst->dqb_ihardlimit = src->d_ino_hardlimit;
|
|
|
|
|
dst->dqb_isoftlimit = src->d_ino_softlimit;
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->dqb_curinodes = src->d_ino_count;
|
|
|
|
|
dst->dqb_btime = src->d_spc_timer;
|
|
|
|
|
dst->dqb_itime = src->d_ino_timer;
|
2010-05-07 05:04:58 +08:00
|
|
|
dst->dqb_valid = QIF_ALL;
|
|
|
|
|
}
|
|
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
static int quota_getquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
|
void __user *addr)
|
|
|
|
|
{
|
2012-09-16 17:07:49 +08:00
|
|
|
struct kqid qid;
|
2014-10-09 22:03:13 +08:00
|
|
|
struct qc_dqblk fdq;
|
2010-02-16 16:44:47 +08:00
|
|
|
struct if_dqblk idq;
|
|
|
|
|
int ret;
|
|
|
|
|
|
2010-02-16 16:44:48 +08:00
|
|
|
if (!sb->s_qcop->get_dqblk)
|
|
|
|
|
return -ENOSYS;
|
2012-09-16 17:07:49 +08:00
|
|
|
qid = make_kqid(current_user_ns(), type, id);
|
|
|
|
|
if (!qid_valid(qid))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
|
2010-02-16 16:44:47 +08:00
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
2010-05-07 05:04:58 +08:00
|
|
|
copy_to_if_dqblk(&idq, &fdq);
|
2010-02-16 16:44:47 +08:00
|
|
|
if (copy_to_user(addr, &idq, sizeof(idq)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2014-10-09 22:03:13 +08:00
|
|
|
static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
|
2010-05-07 05:05:17 +08:00
|
|
|
{
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
|
|
|
|
|
dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
|
|
|
|
|
dst->d_space = src->dqb_curspace;
|
2010-05-07 05:05:17 +08:00
|
|
|
dst->d_ino_hardlimit = src->dqb_ihardlimit;
|
|
|
|
|
dst->d_ino_softlimit = src->dqb_isoftlimit;
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_ino_count = src->dqb_curinodes;
|
|
|
|
|
dst->d_spc_timer = src->dqb_btime;
|
|
|
|
|
dst->d_ino_timer = src->dqb_itime;
|
2010-05-07 05:05:17 +08:00
|
|
|
|
|
|
|
|
dst->d_fieldmask = 0;
|
|
|
|
|
if (src->dqb_valid & QIF_BLIMITS)
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
|
2010-05-07 05:05:17 +08:00
|
|
|
if (src->dqb_valid & QIF_SPACE)
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_fieldmask |= QC_SPACE;
|
2010-05-07 05:05:17 +08:00
|
|
|
if (src->dqb_valid & QIF_ILIMITS)
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
|
2010-05-07 05:05:17 +08:00
|
|
|
if (src->dqb_valid & QIF_INODES)
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_fieldmask |= QC_INO_COUNT;
|
2010-05-07 05:05:17 +08:00
|
|
|
if (src->dqb_valid & QIF_BTIME)
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_fieldmask |= QC_SPC_TIMER;
|
2010-05-07 05:05:17 +08:00
|
|
|
if (src->dqb_valid & QIF_ITIME)
|
2014-10-09 22:03:13 +08:00
|
|
|
dst->d_fieldmask |= QC_INO_TIMER;
|
2010-05-07 05:05:17 +08:00
|
|
|
}
|
|
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
static int quota_setquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
|
void __user *addr)
|
|
|
|
|
{
|
2014-10-09 22:03:13 +08:00
|
|
|
struct qc_dqblk fdq;
|
2010-02-16 16:44:47 +08:00
|
|
|
struct if_dqblk idq;
|
2012-09-16 17:07:49 +08:00
|
|
|
struct kqid qid;
|
2010-02-16 16:44:47 +08:00
|
|
|
|
|
|
|
|
if (copy_from_user(&idq, addr, sizeof(idq)))
|
|
|
|
|
return -EFAULT;
|
2010-02-16 16:44:48 +08:00
|
|
|
if (!sb->s_qcop->set_dqblk)
|
|
|
|
|
return -ENOSYS;
|
2012-09-16 17:07:49 +08:00
|
|
|
qid = make_kqid(current_user_ns(), type, id);
|
|
|
|
|
if (!qid_valid(qid))
|
|
|
|
|
return -EINVAL;
|
2010-05-07 05:05:17 +08:00
|
|
|
copy_from_if_dqblk(&fdq, &idq);
|
2012-09-16 17:07:49 +08:00
|
|
|
return sb->s_qcop->set_dqblk(sb, qid, &fdq);
|
2010-02-16 16:44:47 +08:00
|
|
|
}
|
|
|
|
|
|
2014-10-08 21:56:21 +08:00
|
|
|
static int quota_enable(struct super_block *sb, void __user *addr)
|
2010-02-16 16:44:47 +08:00
|
|
|
{
|
|
|
|
|
__u32 flags;
|
|
|
|
|
|
|
|
|
|
if (copy_from_user(&flags, addr, sizeof(flags)))
|
|
|
|
|
return -EFAULT;
|
2014-10-08 21:56:21 +08:00
|
|
|
if (!sb->s_qcop->quota_enable)
|
2010-02-16 16:44:48 +08:00
|
|
|
return -ENOSYS;
|
2014-10-08 21:56:21 +08:00
|
|
|
return sb->s_qcop->quota_enable(sb, flags);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int quota_disable(struct super_block *sb, void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
__u32 flags;
|
|
|
|
|
|
|
|
|
|
if (copy_from_user(&flags, addr, sizeof(flags)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
if (!sb->s_qcop->quota_disable)
|
|
|
|
|
return -ENOSYS;
|
|
|
|
|
return sb->s_qcop->quota_disable(sb, flags);
|
2010-02-16 16:44:47 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int quota_getxstate(struct super_block *sb, void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
struct fs_quota_stat fqs;
|
|
|
|
|
int ret;
|
2010-02-16 16:44:48 +08:00
|
|
|
|
|
|
|
|
if (!sb->s_qcop->get_xstate)
|
|
|
|
|
return -ENOSYS;
|
2010-02-16 16:44:47 +08:00
|
|
|
ret = sb->s_qcop->get_xstate(sb, &fqs);
|
|
|
|
|
if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2013-08-07 06:27:07 +08:00
|
|
|
static int quota_getxstatev(struct super_block *sb, void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
struct fs_quota_statv fqs;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (!sb->s_qcop->get_xstatev)
|
|
|
|
|
return -ENOSYS;
|
|
|
|
|
|
|
|
|
|
memset(&fqs, 0, sizeof(fqs));
|
|
|
|
|
if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
/* If this kernel doesn't support user specified version, fail */
|
|
|
|
|
switch (fqs.qs_version) {
|
|
|
|
|
case FS_QSTATV_VERSION1:
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
ret = sb->s_qcop->get_xstatev(sb, &fqs);
|
|
|
|
|
if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
2014-10-09 22:03:13 +08:00
|
|
|
/*
|
|
|
|
|
* XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
|
|
|
|
|
* out of there as xfsprogs rely on definitions being in that header file. So
|
|
|
|
|
* just define same functions here for quota purposes.
|
|
|
|
|
*/
|
|
|
|
|
#define XFS_BB_SHIFT 9
|
|
|
|
|
|
|
|
|
|
static inline u64 quota_bbtob(u64 blocks)
|
|
|
|
|
{
|
|
|
|
|
return blocks << XFS_BB_SHIFT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline u64 quota_btobb(u64 bytes)
|
|
|
|
|
{
|
|
|
|
|
return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
|
|
|
|
|
{
|
|
|
|
|
dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
|
|
|
|
|
dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
|
|
|
|
|
dst->d_ino_hardlimit = src->d_ino_hardlimit;
|
|
|
|
|
dst->d_ino_softlimit = src->d_ino_softlimit;
|
|
|
|
|
dst->d_space = quota_bbtob(src->d_bcount);
|
|
|
|
|
dst->d_ino_count = src->d_icount;
|
|
|
|
|
dst->d_ino_timer = src->d_itimer;
|
|
|
|
|
dst->d_spc_timer = src->d_btimer;
|
|
|
|
|
dst->d_ino_warns = src->d_iwarns;
|
|
|
|
|
dst->d_spc_warns = src->d_bwarns;
|
|
|
|
|
dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
|
|
|
|
|
dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
|
|
|
|
|
dst->d_rt_space = quota_bbtob(src->d_rtbcount);
|
|
|
|
|
dst->d_rt_spc_timer = src->d_rtbtimer;
|
|
|
|
|
dst->d_rt_spc_warns = src->d_rtbwarns;
|
|
|
|
|
dst->d_fieldmask = 0;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_ISOFT)
|
|
|
|
|
dst->d_fieldmask |= QC_INO_SOFT;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_IHARD)
|
|
|
|
|
dst->d_fieldmask |= QC_INO_HARD;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_BSOFT)
|
|
|
|
|
dst->d_fieldmask |= QC_SPC_SOFT;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_BHARD)
|
|
|
|
|
dst->d_fieldmask |= QC_SPC_HARD;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_RTBSOFT)
|
|
|
|
|
dst->d_fieldmask |= QC_RT_SPC_SOFT;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_RTBHARD)
|
|
|
|
|
dst->d_fieldmask |= QC_RT_SPC_HARD;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_BTIMER)
|
|
|
|
|
dst->d_fieldmask |= QC_SPC_TIMER;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_ITIMER)
|
|
|
|
|
dst->d_fieldmask |= QC_INO_TIMER;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_RTBTIMER)
|
|
|
|
|
dst->d_fieldmask |= QC_RT_SPC_TIMER;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_BWARNS)
|
|
|
|
|
dst->d_fieldmask |= QC_SPC_WARNS;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_IWARNS)
|
|
|
|
|
dst->d_fieldmask |= QC_INO_WARNS;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_RTBWARNS)
|
|
|
|
|
dst->d_fieldmask |= QC_RT_SPC_WARNS;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_BCOUNT)
|
|
|
|
|
dst->d_fieldmask |= QC_SPACE;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_ICOUNT)
|
|
|
|
|
dst->d_fieldmask |= QC_INO_COUNT;
|
|
|
|
|
if (src->d_fieldmask & FS_DQ_RTBCOUNT)
|
|
|
|
|
dst->d_fieldmask |= QC_RT_SPACE;
|
|
|
|
|
}
|
|
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
static int quota_setxquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
|
void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
struct fs_disk_quota fdq;
|
2014-10-09 22:03:13 +08:00
|
|
|
struct qc_dqblk qdq;
|
2012-09-16 17:07:49 +08:00
|
|
|
struct kqid qid;
|
2010-02-16 16:44:47 +08:00
|
|
|
|
|
|
|
|
if (copy_from_user(&fdq, addr, sizeof(fdq)))
|
|
|
|
|
return -EFAULT;
|
2010-05-07 05:05:17 +08:00
|
|
|
if (!sb->s_qcop->set_dqblk)
|
2010-02-16 16:44:48 +08:00
|
|
|
return -ENOSYS;
|
2012-09-16 17:07:49 +08:00
|
|
|
qid = make_kqid(current_user_ns(), type, id);
|
|
|
|
|
if (!qid_valid(qid))
|
|
|
|
|
return -EINVAL;
|
2014-10-09 22:03:13 +08:00
|
|
|
copy_from_xfs_dqblk(&qdq, &fdq);
|
|
|
|
|
return sb->s_qcop->set_dqblk(sb, qid, &qdq);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
|
|
|
|
|
int type, qid_t id)
|
|
|
|
|
{
|
|
|
|
|
memset(dst, 0, sizeof(*dst));
|
|
|
|
|
dst->d_version = FS_DQUOT_VERSION;
|
|
|
|
|
dst->d_id = id;
|
|
|
|
|
if (type == USRQUOTA)
|
|
|
|
|
dst->d_flags = FS_USER_QUOTA;
|
|
|
|
|
else if (type == PRJQUOTA)
|
|
|
|
|
dst->d_flags = FS_PROJ_QUOTA;
|
|
|
|
|
else
|
|
|
|
|
dst->d_flags = FS_GROUP_QUOTA;
|
|
|
|
|
dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
|
|
|
|
|
dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
|
|
|
|
|
dst->d_ino_hardlimit = src->d_ino_hardlimit;
|
|
|
|
|
dst->d_ino_softlimit = src->d_ino_softlimit;
|
|
|
|
|
dst->d_bcount = quota_btobb(src->d_space);
|
|
|
|
|
dst->d_icount = src->d_ino_count;
|
|
|
|
|
dst->d_itimer = src->d_ino_timer;
|
|
|
|
|
dst->d_btimer = src->d_spc_timer;
|
|
|
|
|
dst->d_iwarns = src->d_ino_warns;
|
|
|
|
|
dst->d_bwarns = src->d_spc_warns;
|
|
|
|
|
dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
|
|
|
|
|
dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
|
|
|
|
|
dst->d_rtbcount = quota_btobb(src->d_rt_space);
|
|
|
|
|
dst->d_rtbtimer = src->d_rt_spc_timer;
|
|
|
|
|
dst->d_rtbwarns = src->d_rt_spc_warns;
|
2010-02-16 16:44:47 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int quota_getxquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
|
void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
struct fs_disk_quota fdq;
|
2014-10-09 22:03:13 +08:00
|
|
|
struct qc_dqblk qdq;
|
2012-09-16 17:07:49 +08:00
|
|
|
struct kqid qid;
|
2010-02-16 16:44:47 +08:00
|
|
|
int ret;
|
|
|
|
|
|
2010-05-07 05:04:58 +08:00
|
|
|
if (!sb->s_qcop->get_dqblk)
|
2010-02-16 16:44:48 +08:00
|
|
|
return -ENOSYS;
|
2012-09-16 17:07:49 +08:00
|
|
|
qid = make_kqid(current_user_ns(), type, id);
|
|
|
|
|
if (!qid_valid(qid))
|
|
|
|
|
return -EINVAL;
|
2014-10-09 22:03:13 +08:00
|
|
|
ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
copy_to_xfs_dqblk(&fdq, &qdq, type, id);
|
|
|
|
|
if (copy_to_user(addr, &fdq, sizeof(fdq)))
|
2010-02-16 16:44:47 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
xfs: fix Q_XQUOTARM ioctl
The Q_XQUOTARM quotactl was not working properly, because
we weren't passing around proper flags. The xfs_fs_set_xstate()
ioctl handler used the same flags for Q_XQUOTAON/OFF as
well as for Q_XQUOTARM, but Q_XQUOTAON/OFF look for
XFS_UQUOTA_ACCT, XFS_UQUOTA_ENFD, XFS_GQUOTA_ACCT etc,
i.e. quota type + state, while Q_XQUOTARM looks only for
the type of quota, i.e. XFS_DQ_USER, XFS_DQ_GROUP etc.
Unfortunately these flag spaces overlap a bit, so we
got semi-random results for Q_XQUOTARM; i.e. the value
for XFS_DQ_USER == XFS_UQUOTA_ACCT, etc. yeargh.
Add a new quotactl op vector specifically for the QUOTARM
operation, since it operates with a different flag space.
This has been broken more or less forever, AFAICT.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-05-05 15:25:50 +08:00
|
|
|
static int quota_rmxquota(struct super_block *sb, void __user *addr)
|
|
|
|
|
{
|
|
|
|
|
__u32 flags;
|
|
|
|
|
|
|
|
|
|
if (copy_from_user(&flags, addr, sizeof(flags)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
if (!sb->s_qcop->rm_xquota)
|
|
|
|
|
return -ENOSYS;
|
|
|
|
|
return sb->s_qcop->rm_xquota(sb, flags);
|
|
|
|
|
}
|
|
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
/* Copy parameters and call proper function */
|
|
|
|
|
static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
|
2010-09-15 23:38:58 +08:00
|
|
|
void __user *addr, struct path *path)
|
2010-02-16 16:44:47 +08:00
|
|
|
{
|
2010-02-16 16:44:50 +08:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
|
|
|
|
|
return -EINVAL;
|
2014-09-30 16:43:09 +08:00
|
|
|
/*
|
|
|
|
|
* Quota not supported on this fs? Check this before s_quota_types
|
|
|
|
|
* since they needn't be set if quota is not supported at all.
|
|
|
|
|
*/
|
2010-02-16 16:44:50 +08:00
|
|
|
if (!sb->s_qcop)
|
|
|
|
|
return -ENOSYS;
|
2014-09-30 16:43:09 +08:00
|
|
|
if (!(sb->s_quota_types & (1 << type)))
|
|
|
|
|
return -EINVAL;
|
2010-02-16 16:44:50 +08:00
|
|
|
|
|
|
|
|
ret = check_quotactl_permission(sb, type, cmd, id);
|
|
|
|
|
if (ret < 0)
|
|
|
|
|
return ret;
|
|
|
|
|
|
2010-02-16 16:44:47 +08:00
|
|
|
switch (cmd) {
|
|
|
|
|
case Q_QUOTAON:
|
2010-09-15 23:38:58 +08:00
|
|
|
return quota_quotaon(sb, type, cmd, id, path);
|
2010-02-16 16:44:47 +08:00
|
|
|
case Q_QUOTAOFF:
|
2010-02-16 16:44:48 +08:00
|
|
|
if (!sb->s_qcop->quota_off)
|
|
|
|
|
return -ENOSYS;
|
2010-05-19 19:16:43 +08:00
|
|
|
return sb->s_qcop->quota_off(sb, type);
|
2010-02-16 16:44:47 +08:00
|
|
|
case Q_GETFMT:
|
|
|
|
|
return quota_getfmt(sb, type, addr);
|
|
|
|
|
case Q_GETINFO:
|
|
|
|
|
return quota_getinfo(sb, type, addr);
|
|
|
|
|
case Q_SETINFO:
|
|
|
|
|
return quota_setinfo(sb, type, addr);
|
|
|
|
|
case Q_GETQUOTA:
|
|
|
|
|
return quota_getquota(sb, type, id, addr);
|
|
|
|
|
case Q_SETQUOTA:
|
|
|
|
|
return quota_setquota(sb, type, id, addr);
|
|
|
|
|
case Q_SYNC:
|
2010-02-16 16:44:49 +08:00
|
|
|
if (!sb->s_qcop->quota_sync)
|
|
|
|
|
return -ENOSYS;
|
2012-07-03 22:45:28 +08:00
|
|
|
return sb->s_qcop->quota_sync(sb, type);
|
2010-02-16 16:44:47 +08:00
|
|
|
case Q_XQUOTAON:
|
2014-10-08 21:56:21 +08:00
|
|
|
return quota_enable(sb, addr);
|
2010-02-16 16:44:47 +08:00
|
|
|
case Q_XQUOTAOFF:
|
2014-10-08 21:56:21 +08:00
|
|
|
return quota_disable(sb, addr);
|
xfs: fix Q_XQUOTARM ioctl
The Q_XQUOTARM quotactl was not working properly, because
we weren't passing around proper flags. The xfs_fs_set_xstate()
ioctl handler used the same flags for Q_XQUOTAON/OFF as
well as for Q_XQUOTARM, but Q_XQUOTAON/OFF look for
XFS_UQUOTA_ACCT, XFS_UQUOTA_ENFD, XFS_GQUOTA_ACCT etc,
i.e. quota type + state, while Q_XQUOTARM looks only for
the type of quota, i.e. XFS_DQ_USER, XFS_DQ_GROUP etc.
Unfortunately these flag spaces overlap a bit, so we
got semi-random results for Q_XQUOTARM; i.e. the value
for XFS_DQ_USER == XFS_UQUOTA_ACCT, etc. yeargh.
Add a new quotactl op vector specifically for the QUOTARM
operation, since it operates with a different flag space.
This has been broken more or less forever, AFAICT.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-05-05 15:25:50 +08:00
|
|
|
case Q_XQUOTARM:
|
|
|
|
|
return quota_rmxquota(sb, addr);
|
2010-02-16 16:44:47 +08:00
|
|
|
case Q_XGETQSTAT:
|
|
|
|
|
return quota_getxstate(sb, addr);
|
2013-08-07 06:27:07 +08:00
|
|
|
case Q_XGETQSTATV:
|
|
|
|
|
return quota_getxstatev(sb, addr);
|
2010-02-16 16:44:47 +08:00
|
|
|
case Q_XSETQLIM:
|
|
|
|
|
return quota_setxquota(sb, type, id, addr);
|
|
|
|
|
case Q_XGETQUOTA:
|
|
|
|
|
return quota_getxquota(sb, type, id, addr);
|
|
|
|
|
case Q_XQUOTASYNC:
|
2010-02-16 16:44:51 +08:00
|
|
|
if (sb->s_flags & MS_RDONLY)
|
|
|
|
|
return -EROFS;
|
2012-02-20 10:28:18 +08:00
|
|
|
/* XFS quotas are fully coherent now, making this call a noop */
|
2010-02-16 16:44:51 +08:00
|
|
|
return 0;
|
2010-02-16 16:44:47 +08:00
|
|
|
default:
|
2010-02-16 16:44:48 +08:00
|
|
|
return -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2012-11-04 06:02:28 +08:00
|
|
|
#ifdef CONFIG_BLOCK
|
|
|
|
|
|
2012-02-10 18:03:01 +08:00
|
|
|
/* Return 1 if 'cmd' will block on frozen filesystem */
|
|
|
|
|
static int quotactl_cmd_write(int cmd)
|
|
|
|
|
{
|
|
|
|
|
switch (cmd) {
|
|
|
|
|
case Q_GETFMT:
|
|
|
|
|
case Q_GETINFO:
|
|
|
|
|
case Q_SYNC:
|
|
|
|
|
case Q_XGETQSTAT:
|
2013-08-07 06:27:07 +08:00
|
|
|
case Q_XGETQSTATV:
|
2012-02-10 18:03:01 +08:00
|
|
|
case Q_XGETQUOTA:
|
|
|
|
|
case Q_XQUOTASYNC:
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2012-11-04 06:02:28 +08:00
|
|
|
#endif /* CONFIG_BLOCK */
|
|
|
|
|
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-10-01 02:45:40 +08:00
|
|
|
/*
|
|
|
|
|
* look up a superblock on which quota ops will be performed
|
|
|
|
|
* - use the name of a block device to find the superblock thereon
|
|
|
|
|
*/
|
2012-02-10 18:03:01 +08:00
|
|
|
static struct super_block *quotactl_block(const char __user *special, int cmd)
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-10-01 02:45:40 +08:00
|
|
|
{
|
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
|
|
|
struct block_device *bdev;
|
|
|
|
|
struct super_block *sb;
|
2012-10-11 03:25:28 +08:00
|
|
|
struct filename *tmp = getname(special);
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-10-01 02:45:40 +08:00
|
|
|
|
|
|
|
|
if (IS_ERR(tmp))
|
2008-02-07 16:15:26 +08:00
|
|
|
return ERR_CAST(tmp);
|
2012-10-11 03:25:28 +08:00
|
|
|
bdev = lookup_bdev(tmp->name);
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-10-01 02:45:40 +08:00
|
|
|
putname(tmp);
|
|
|
|
|
if (IS_ERR(bdev))
|
2008-02-07 16:15:26 +08:00
|
|
|
return ERR_CAST(bdev);
|
2012-02-10 18:03:01 +08:00
|
|
|
if (quotactl_cmd_write(cmd))
|
|
|
|
|
sb = get_super_thawed(bdev);
|
|
|
|
|
else
|
|
|
|
|
sb = get_super(bdev);
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-10-01 02:45:40 +08:00
|
|
|
bdput(bdev);
|
|
|
|
|
if (!sb)
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
|
|
|
|
|
return sb;
|
|
|
|
|
#else
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
|
* This is the system call interface. This communicates with
|
|
|
|
|
* the user-level programs. Currently this only supports diskquota
|
|
|
|
|
* calls. Maybe we need to add the process quotas etc. in the future,
|
|
|
|
|
* but we probably should use rlimits for that.
|
|
|
|
|
*/
|
2009-01-14 21:14:22 +08:00
|
|
|
SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
|
|
|
|
|
qid_t, id, void __user *, addr)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
uint cmds, type;
|
|
|
|
|
struct super_block *sb = NULL;
|
2010-09-15 23:38:58 +08:00
|
|
|
struct path path, *pathp = NULL;
|
2005-04-17 06:20:36 +08:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
cmds = cmd >> SUBCMDSHIFT;
|
|
|
|
|
type = cmd & SUBCMDMASK;
|
|
|
|
|
|
2010-02-16 16:44:49 +08:00
|
|
|
/*
|
|
|
|
|
* As a special case Q_SYNC can be called without a specific device.
|
|
|
|
|
* It will iterate all superblocks that have quota enabled and call
|
|
|
|
|
* the sync action on each of them.
|
|
|
|
|
*/
|
|
|
|
|
if (!special) {
|
|
|
|
|
if (cmds == Q_SYNC)
|
|
|
|
|
return quota_sync_all(type);
|
|
|
|
|
return -ENODEV;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
2010-09-15 23:38:58 +08:00
|
|
|
/*
|
|
|
|
|
* Path for quotaon has to be resolved before grabbing superblock
|
|
|
|
|
* because that gets s_umount sem which is also possibly needed by path
|
|
|
|
|
* resolution (think about autofs) and thus deadlocks could arise.
|
|
|
|
|
*/
|
|
|
|
|
if (cmds == Q_QUOTAON) {
|
2011-09-27 08:36:09 +08:00
|
|
|
ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
|
2010-09-15 23:38:58 +08:00
|
|
|
if (ret)
|
|
|
|
|
pathp = ERR_PTR(ret);
|
|
|
|
|
else
|
|
|
|
|
pathp = &path;
|
|
|
|
|
}
|
|
|
|
|
|
2012-02-10 18:03:01 +08:00
|
|
|
sb = quotactl_block(special, cmds);
|
2011-10-11 00:32:06 +08:00
|
|
|
if (IS_ERR(sb)) {
|
|
|
|
|
ret = PTR_ERR(sb);
|
|
|
|
|
goto out;
|
|
|
|
|
}
|
2010-02-16 16:44:49 +08:00
|
|
|
|
2010-09-15 23:38:58 +08:00
|
|
|
ret = do_quotactl(sb, type, cmds, id, addr, pathp);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-16 16:44:49 +08:00
|
|
|
drop_super(sb);
|
2011-10-11 00:32:06 +08:00
|
|
|
out:
|
2010-09-15 23:38:58 +08:00
|
|
|
if (pathp && !IS_ERR(pathp))
|
|
|
|
|
path_put(pathp);
|
2005-04-17 06:20:36 +08:00
|
|
|
return ret;
|
|
|
|
|
}
|