2005-04-17 02:20:36 +04:00
|
|
|
/*
|
|
|
|
* 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 19:40:17 +04:00
|
|
|
#include <linux/uaccess.h>
|
2005-04-17 02:20:36 +04:00
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/security.h>
|
|
|
|
#include <linux/syscalls.h>
|
2006-01-11 23:17:46 +03:00
|
|
|
#include <linux/capability.h>
|
2005-11-07 11:59:35 +03:00
|
|
|
#include <linux/quotaops.h>
|
2007-07-16 10:41:12 +04:00
|
|
|
#include <linux/types.h>
|
2010-02-16 11:44:51 +03:00
|
|
|
#include <linux/writeback.h>
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:50 +03:00
|
|
|
static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
|
|
|
|
qid_t id)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
2010-02-16 11:44:50 +03:00
|
|
|
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 02:27:07 +04:00
|
|
|
case Q_XGETQSTATV:
|
2010-02-16 11:44:50 +03:00
|
|
|
case Q_XQUOTASYNC:
|
|
|
|
break;
|
|
|
|
/* allow to query information for dquots we "own" */
|
|
|
|
case Q_GETQUOTA:
|
|
|
|
case Q_XGETQUOTA:
|
2012-09-16 13:07:49 +04:00
|
|
|
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 11:44:50 +03:00
|
|
|
break;
|
|
|
|
/*FALLTHROUGH*/
|
|
|
|
default:
|
2005-04-17 02:20:36 +04:00
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
|
|
return -EPERM;
|
|
|
|
}
|
|
|
|
|
2010-02-16 11:44:50 +03:00
|
|
|
return security_quotactl(cmd, type, id, sb);
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
2010-03-23 13:06:58 +03:00
|
|
|
static void quota_sync_one(struct super_block *sb, void *arg)
|
|
|
|
{
|
|
|
|
if (sb->s_qcop && sb->s_qcop->quota_sync)
|
2012-07-03 18:45:28 +04:00
|
|
|
sb->s_qcop->quota_sync(sb, *(int *)arg);
|
2010-03-23 13:06:58 +03:00
|
|
|
}
|
|
|
|
|
2010-02-16 11:44:49 +03:00
|
|
|
static int quota_sync_all(int type)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
2010-02-16 11:44:49 +03:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (type >= MAXQUOTAS)
|
|
|
|
return -EINVAL;
|
|
|
|
ret = security_quotactl(Q_SYNC, type, 0, NULL);
|
2010-03-23 13:06:58 +03:00
|
|
|
if (!ret)
|
|
|
|
iterate_supers(quota_sync_one, &type);
|
|
|
|
return ret;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
|
2010-09-15 19:38:58 +04:00
|
|
|
struct path *path)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
2010-09-15 19:38:58 +04:00
|
|
|
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 11:44:47 +03:00
|
|
|
}
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
|
|
|
|
{
|
|
|
|
__u32 fmt;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
down_read(&sb_dqopt(sb)->dqptr_sem);
|
|
|
|
if (!sb_has_quota_active(sb, type)) {
|
|
|
|
up_read(&sb_dqopt(sb)->dqptr_sem);
|
|
|
|
return -ESRCH;
|
|
|
|
}
|
|
|
|
fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
|
|
|
|
up_read(&sb_dqopt(sb)->dqptr_sem);
|
|
|
|
if (copy_to_user(addr, &fmt, sizeof(fmt)))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
}
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
|
|
|
|
{
|
|
|
|
struct if_dqinfo info;
|
|
|
|
int ret;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:48 +03:00
|
|
|
if (!sb->s_qcop->get_info)
|
|
|
|
return -ENOSYS;
|
2010-02-16 11:44:47 +03:00
|
|
|
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 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
|
|
|
|
{
|
|
|
|
struct if_dqinfo info;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
if (copy_from_user(&info, addr, sizeof(info)))
|
|
|
|
return -EFAULT;
|
2010-02-16 11:44:48 +03:00
|
|
|
if (!sb->s_qcop->set_info)
|
|
|
|
return -ENOSYS;
|
2010-02-16 11:44:47 +03:00
|
|
|
return sb->s_qcop->set_info(sb, type, &info);
|
|
|
|
}
|
|
|
|
|
2010-05-07 01:04:58 +04:00
|
|
|
static void copy_to_if_dqblk(struct if_dqblk *dst, struct fs_disk_quota *src)
|
|
|
|
{
|
2013-11-01 14:21:54 +04:00
|
|
|
memset(dst, 0, sizeof(*dst));
|
2010-05-07 01:04:58 +04:00
|
|
|
dst->dqb_bhardlimit = src->d_blk_hardlimit;
|
|
|
|
dst->dqb_bsoftlimit = src->d_blk_softlimit;
|
|
|
|
dst->dqb_curspace = src->d_bcount;
|
|
|
|
dst->dqb_ihardlimit = src->d_ino_hardlimit;
|
|
|
|
dst->dqb_isoftlimit = src->d_ino_softlimit;
|
|
|
|
dst->dqb_curinodes = src->d_icount;
|
|
|
|
dst->dqb_btime = src->d_btimer;
|
|
|
|
dst->dqb_itime = src->d_itimer;
|
|
|
|
dst->dqb_valid = QIF_ALL;
|
|
|
|
}
|
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
static int quota_getquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
void __user *addr)
|
|
|
|
{
|
2012-09-16 13:07:49 +04:00
|
|
|
struct kqid qid;
|
2010-05-07 01:04:58 +04:00
|
|
|
struct fs_disk_quota fdq;
|
2010-02-16 11:44:47 +03:00
|
|
|
struct if_dqblk idq;
|
|
|
|
int ret;
|
|
|
|
|
2010-02-16 11:44:48 +03:00
|
|
|
if (!sb->s_qcop->get_dqblk)
|
|
|
|
return -ENOSYS;
|
2012-09-16 13:07:49 +04:00
|
|
|
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 11:44:47 +03:00
|
|
|
if (ret)
|
|
|
|
return ret;
|
2010-05-07 01:04:58 +04:00
|
|
|
copy_to_if_dqblk(&idq, &fdq);
|
2010-02-16 11:44:47 +03:00
|
|
|
if (copy_to_user(addr, &idq, sizeof(idq)))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-05-07 01:05:17 +04:00
|
|
|
static void copy_from_if_dqblk(struct fs_disk_quota *dst, struct if_dqblk *src)
|
|
|
|
{
|
|
|
|
dst->d_blk_hardlimit = src->dqb_bhardlimit;
|
|
|
|
dst->d_blk_softlimit = src->dqb_bsoftlimit;
|
|
|
|
dst->d_bcount = src->dqb_curspace;
|
|
|
|
dst->d_ino_hardlimit = src->dqb_ihardlimit;
|
|
|
|
dst->d_ino_softlimit = src->dqb_isoftlimit;
|
|
|
|
dst->d_icount = src->dqb_curinodes;
|
|
|
|
dst->d_btimer = src->dqb_btime;
|
|
|
|
dst->d_itimer = src->dqb_itime;
|
|
|
|
|
|
|
|
dst->d_fieldmask = 0;
|
|
|
|
if (src->dqb_valid & QIF_BLIMITS)
|
|
|
|
dst->d_fieldmask |= FS_DQ_BSOFT | FS_DQ_BHARD;
|
|
|
|
if (src->dqb_valid & QIF_SPACE)
|
|
|
|
dst->d_fieldmask |= FS_DQ_BCOUNT;
|
|
|
|
if (src->dqb_valid & QIF_ILIMITS)
|
|
|
|
dst->d_fieldmask |= FS_DQ_ISOFT | FS_DQ_IHARD;
|
|
|
|
if (src->dqb_valid & QIF_INODES)
|
|
|
|
dst->d_fieldmask |= FS_DQ_ICOUNT;
|
|
|
|
if (src->dqb_valid & QIF_BTIME)
|
|
|
|
dst->d_fieldmask |= FS_DQ_BTIMER;
|
|
|
|
if (src->dqb_valid & QIF_ITIME)
|
|
|
|
dst->d_fieldmask |= FS_DQ_ITIMER;
|
|
|
|
}
|
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
static int quota_setquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
void __user *addr)
|
|
|
|
{
|
2010-05-07 01:05:17 +04:00
|
|
|
struct fs_disk_quota fdq;
|
2010-02-16 11:44:47 +03:00
|
|
|
struct if_dqblk idq;
|
2012-09-16 13:07:49 +04:00
|
|
|
struct kqid qid;
|
2010-02-16 11:44:47 +03:00
|
|
|
|
|
|
|
if (copy_from_user(&idq, addr, sizeof(idq)))
|
|
|
|
return -EFAULT;
|
2010-02-16 11:44:48 +03:00
|
|
|
if (!sb->s_qcop->set_dqblk)
|
|
|
|
return -ENOSYS;
|
2012-09-16 13:07:49 +04:00
|
|
|
qid = make_kqid(current_user_ns(), type, id);
|
|
|
|
if (!qid_valid(qid))
|
|
|
|
return -EINVAL;
|
2010-05-07 01:05:17 +04:00
|
|
|
copy_from_if_dqblk(&fdq, &idq);
|
2012-09-16 13:07:49 +04:00
|
|
|
return sb->s_qcop->set_dqblk(sb, qid, &fdq);
|
2010-02-16 11:44:47 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
static int quota_setxstate(struct super_block *sb, int cmd, void __user *addr)
|
|
|
|
{
|
|
|
|
__u32 flags;
|
|
|
|
|
|
|
|
if (copy_from_user(&flags, addr, sizeof(flags)))
|
|
|
|
return -EFAULT;
|
2010-02-16 11:44:48 +03:00
|
|
|
if (!sb->s_qcop->set_xstate)
|
|
|
|
return -ENOSYS;
|
2010-02-16 11:44:47 +03:00
|
|
|
return sb->s_qcop->set_xstate(sb, flags, cmd);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int quota_getxstate(struct super_block *sb, void __user *addr)
|
|
|
|
{
|
|
|
|
struct fs_quota_stat fqs;
|
|
|
|
int ret;
|
2010-02-16 11:44:48 +03:00
|
|
|
|
|
|
|
if (!sb->s_qcop->get_xstate)
|
|
|
|
return -ENOSYS;
|
2010-02-16 11:44:47 +03:00
|
|
|
ret = sb->s_qcop->get_xstate(sb, &fqs);
|
|
|
|
if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
|
|
|
|
return -EFAULT;
|
|
|
|
return ret;
|
|
|
|
}
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2013-08-07 02:27:07 +04:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
static int quota_setxquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
void __user *addr)
|
|
|
|
{
|
|
|
|
struct fs_disk_quota fdq;
|
2012-09-16 13:07:49 +04:00
|
|
|
struct kqid qid;
|
2010-02-16 11:44:47 +03:00
|
|
|
|
|
|
|
if (copy_from_user(&fdq, addr, sizeof(fdq)))
|
|
|
|
return -EFAULT;
|
2010-05-07 01:05:17 +04:00
|
|
|
if (!sb->s_qcop->set_dqblk)
|
2010-02-16 11:44:48 +03:00
|
|
|
return -ENOSYS;
|
2012-09-16 13:07:49 +04:00
|
|
|
qid = make_kqid(current_user_ns(), type, id);
|
|
|
|
if (!qid_valid(qid))
|
|
|
|
return -EINVAL;
|
|
|
|
return sb->s_qcop->set_dqblk(sb, qid, &fdq);
|
2010-02-16 11:44:47 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
static int quota_getxquota(struct super_block *sb, int type, qid_t id,
|
|
|
|
void __user *addr)
|
|
|
|
{
|
|
|
|
struct fs_disk_quota fdq;
|
2012-09-16 13:07:49 +04:00
|
|
|
struct kqid qid;
|
2010-02-16 11:44:47 +03:00
|
|
|
int ret;
|
|
|
|
|
2010-05-07 01:04:58 +04:00
|
|
|
if (!sb->s_qcop->get_dqblk)
|
2010-02-16 11:44:48 +03:00
|
|
|
return -ENOSYS;
|
2012-09-16 13:07:49 +04:00
|
|
|
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 11:44:47 +03:00
|
|
|
if (!ret && copy_to_user(addr, &fdq, sizeof(fdq)))
|
|
|
|
return -EFAULT;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Copy parameters and call proper function */
|
|
|
|
static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
|
2010-09-15 19:38:58 +04:00
|
|
|
void __user *addr, struct path *path)
|
2010-02-16 11:44:47 +03:00
|
|
|
{
|
2010-02-16 11:44:50 +03:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
|
|
|
|
return -EINVAL;
|
|
|
|
if (!sb->s_qcop)
|
|
|
|
return -ENOSYS;
|
|
|
|
|
|
|
|
ret = check_quotactl_permission(sb, type, cmd, id);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
2010-02-16 11:44:47 +03:00
|
|
|
switch (cmd) {
|
|
|
|
case Q_QUOTAON:
|
2010-09-15 19:38:58 +04:00
|
|
|
return quota_quotaon(sb, type, cmd, id, path);
|
2010-02-16 11:44:47 +03:00
|
|
|
case Q_QUOTAOFF:
|
2010-02-16 11:44:48 +03:00
|
|
|
if (!sb->s_qcop->quota_off)
|
|
|
|
return -ENOSYS;
|
2010-05-19 15:16:43 +04:00
|
|
|
return sb->s_qcop->quota_off(sb, type);
|
2010-02-16 11:44:47 +03:00
|
|
|
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 11:44:49 +03:00
|
|
|
if (!sb->s_qcop->quota_sync)
|
|
|
|
return -ENOSYS;
|
2012-07-03 18:45:28 +04:00
|
|
|
return sb->s_qcop->quota_sync(sb, type);
|
2010-02-16 11:44:47 +03:00
|
|
|
case Q_XQUOTAON:
|
|
|
|
case Q_XQUOTAOFF:
|
|
|
|
case Q_XQUOTARM:
|
|
|
|
return quota_setxstate(sb, cmd, addr);
|
|
|
|
case Q_XGETQSTAT:
|
|
|
|
return quota_getxstate(sb, addr);
|
2013-08-07 02:27:07 +04:00
|
|
|
case Q_XGETQSTATV:
|
|
|
|
return quota_getxstatev(sb, addr);
|
2010-02-16 11:44:47 +03:00
|
|
|
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 11:44:51 +03:00
|
|
|
if (sb->s_flags & MS_RDONLY)
|
|
|
|
return -EROFS;
|
2012-02-20 06:28:18 +04:00
|
|
|
/* XFS quotas are fully coherent now, making this call a noop */
|
2010-02-16 11:44:51 +03:00
|
|
|
return 0;
|
2010-02-16 11:44:47 +03:00
|
|
|
default:
|
2010-02-16 11:44:48 +03:00
|
|
|
return -EINVAL;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-11-04 02:02:28 +04:00
|
|
|
#ifdef CONFIG_BLOCK
|
|
|
|
|
2012-02-10 14:03:01 +04:00
|
|
|
/* 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 02:27:07 +04:00
|
|
|
case Q_XGETQSTATV:
|
2012-02-10 14:03:01 +04:00
|
|
|
case Q_XGETQUOTA:
|
|
|
|
case Q_XQUOTASYNC:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2012-11-04 02:02:28 +04:00
|
|
|
#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>
2006-09-30 22:45:40 +04:00
|
|
|
/*
|
|
|
|
* 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 14:03:01 +04:00
|
|
|
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>
2006-09-30 22:45:40 +04:00
|
|
|
{
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
|
|
struct block_device *bdev;
|
|
|
|
struct super_block *sb;
|
2012-10-10 23:25:28 +04:00
|
|
|
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>
2006-09-30 22:45:40 +04:00
|
|
|
|
|
|
|
if (IS_ERR(tmp))
|
2008-02-07 11:15:26 +03:00
|
|
|
return ERR_CAST(tmp);
|
2012-10-10 23:25:28 +04:00
|
|
|
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>
2006-09-30 22:45:40 +04:00
|
|
|
putname(tmp);
|
|
|
|
if (IS_ERR(bdev))
|
2008-02-07 11:15:26 +03:00
|
|
|
return ERR_CAST(bdev);
|
2012-02-10 14:03:01 +04:00
|
|
|
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>
2006-09-30 22:45:40 +04:00
|
|
|
bdput(bdev);
|
|
|
|
if (!sb)
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
|
|
|
return sb;
|
|
|
|
#else
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
/*
|
|
|
|
* 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 16:14:22 +03:00
|
|
|
SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
|
|
|
|
qid_t, id, void __user *, addr)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
|
|
|
uint cmds, type;
|
|
|
|
struct super_block *sb = NULL;
|
2010-09-15 19:38:58 +04:00
|
|
|
struct path path, *pathp = NULL;
|
2005-04-17 02:20:36 +04:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
cmds = cmd >> SUBCMDSHIFT;
|
|
|
|
type = cmd & SUBCMDMASK;
|
|
|
|
|
2010-02-16 11:44:49 +03:00
|
|
|
/*
|
|
|
|
* 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 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
2010-09-15 19:38:58 +04:00
|
|
|
/*
|
|
|
|
* 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 04:36:09 +04:00
|
|
|
ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
|
2010-09-15 19:38:58 +04:00
|
|
|
if (ret)
|
|
|
|
pathp = ERR_PTR(ret);
|
|
|
|
else
|
|
|
|
pathp = &path;
|
|
|
|
}
|
|
|
|
|
2012-02-10 14:03:01 +04:00
|
|
|
sb = quotactl_block(special, cmds);
|
2011-10-10 20:32:06 +04:00
|
|
|
if (IS_ERR(sb)) {
|
|
|
|
ret = PTR_ERR(sb);
|
|
|
|
goto out;
|
|
|
|
}
|
2010-02-16 11:44:49 +03:00
|
|
|
|
2010-09-15 19:38:58 +04:00
|
|
|
ret = do_quotactl(sb, type, cmds, id, addr, pathp);
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2010-02-16 11:44:49 +03:00
|
|
|
drop_super(sb);
|
2011-10-10 20:32:06 +04:00
|
|
|
out:
|
2010-09-15 19:38:58 +04:00
|
|
|
if (pathp && !IS_ERR(pathp))
|
|
|
|
path_put(pathp);
|
2005-04-17 02:20:36 +04:00
|
|
|
return ret;
|
|
|
|
}
|