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quota: Allow to separately enable quota accounting and enforcing limits

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Split DQUOT_USR_ENABLED (and DQUOT_GRP_ENABLED) into DQUOT_USR_USAGE_ENABLED
and DQUOT_USR_LIMITS_ENABLED. This way we are able to separately enable /
disable whether we should:
1) ignore quotas completely
2) just keep uptodate information about usage
3) actually enforce quota limits

This is going to be useful when quota is treated as filesystem metadata - we
then want to keep quota information uptodate all the time and just enable /
disable limits enforcement.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Jan Kara
2008-08-20 17:50:32 +02:00
committed by Mark Fasheh
parent e4bc7b4b7f
commit f55abc0fb9
4 changed files with 239 additions and 112 deletions
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30
include/linux/quota.h
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@ -318,12 +318,34 @@ struct quota_format_type {
struct quota_format_type *qf_next;
};
#define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */
#define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */
#define DQUOT_USR_SUSPENDED 0x04 /* User diskquotas are off, but
/* Quota state flags - they actually come in two flavors - for users and groups */
enum {
_DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
_DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
_DQUOT_SUSPENDED, /* User diskquotas are off, but
* we have necessary info in
* memory to turn them on */
#define DQUOT_GRP_SUSPENDED 0x08 /* The same for group quotas */
_DQUOT_STATE_FLAGS
};
#define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED)
#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED)
#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED)
#define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
DQUOT_SUSPENDED)
static inline unsigned int dquot_state_flag(unsigned int flags, int type)
{
if (type == USRQUOTA)
return flags;
return flags << _DQUOT_STATE_FLAGS;
}
static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
{
if (type == USRQUOTA)
return flags;
return flags >> _DQUOT_STATE_FLAGS;
}
struct quota_info {
unsigned int flags; /* Flags for diskquotas on this device */