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quota: Wire up Q_GETXSTATE and Q_GETXSTATV calls to work with ->get_s…
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…tate

Add appropriate conversion functions so that filesystems supporting
->get_state() method can be queried using Q_GETXSTATE and Q_GETXSTATV
calls.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
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Jan Kara committed Mar 4, 2015
1 parent 0a24033 commit bc230e4
Showing 1 changed file with 134 additions and 4 deletions.
138 changes: 134 additions & 4 deletions fs/quota/quota.c
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Original file line number Diff line number Diff line change
Expand Up @@ -269,25 +269,152 @@ static int quota_disable(struct super_block *sb, void __user *addr)
return sb->s_qcop->quota_disable(sb, flags);
}

static int quota_state_to_flags(struct qc_state *state)
{
int flags = 0;

if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED)
flags |= FS_QUOTA_UDQ_ACCT;
if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED)
flags |= FS_QUOTA_UDQ_ENFD;
if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)
flags |= FS_QUOTA_GDQ_ACCT;
if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED)
flags |= FS_QUOTA_GDQ_ENFD;
if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED)
flags |= FS_QUOTA_PDQ_ACCT;
if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED)
flags |= FS_QUOTA_PDQ_ENFD;
return flags;
}

static int quota_getstate(struct super_block *sb, struct fs_quota_stat *fqs)
{
int type;
struct qc_state state;
int ret;

ret = sb->s_qcop->get_state(sb, &state);
if (ret < 0)
return ret;

memset(fqs, 0, sizeof(*fqs));
fqs->qs_version = FS_QSTAT_VERSION;
fqs->qs_flags = quota_state_to_flags(&state);
/* No quota enabled? */
if (!fqs->qs_flags)
return -ENOSYS;
fqs->qs_incoredqs = state.s_incoredqs;
/*
* GETXSTATE quotactl has space for just one set of time limits so
* report them for the first enabled quota type
*/
for (type = 0; type < XQM_MAXQUOTAS; type++)
if (state.s_state[type].flags & QCI_ACCT_ENABLED)
break;
BUG_ON(type == XQM_MAXQUOTAS);
fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
if (state.s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) {
fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
}
if (state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) {
fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
}
if (state.s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) {
/*
* Q_XGETQSTAT doesn't have room for both group and project
* quotas. So, allow the project quota values to be copied out
* only if there is no group quota information available.
*/
if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) {
fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino;
fqs->qs_gquota.qfs_nblks =
state.s_state[PRJQUOTA].blocks;
fqs->qs_gquota.qfs_nextents =
state.s_state[PRJQUOTA].nextents;
}
}
return 0;
}

static int quota_getxstate(struct super_block *sb, void __user *addr)
{
struct fs_quota_stat fqs;
int ret;

if (!sb->s_qcop->get_xstate)
if (!sb->s_qcop->get_xstate && !sb->s_qcop->get_state)
return -ENOSYS;
ret = sb->s_qcop->get_xstate(sb, &fqs);
if (sb->s_qcop->get_state)
ret = quota_getstate(sb, &fqs);
else
ret = sb->s_qcop->get_xstate(sb, &fqs);
if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
return -EFAULT;
return ret;
}

static int quota_getstatev(struct super_block *sb, struct fs_quota_statv *fqs)
{
int type;
struct qc_state state;
int ret;

ret = sb->s_qcop->get_state(sb, &state);
if (ret < 0)
return ret;

memset(fqs, 0, sizeof(*fqs));
fqs->qs_version = FS_QSTAT_VERSION;
fqs->qs_flags = quota_state_to_flags(&state);
/* No quota enabled? */
if (!fqs->qs_flags)
return -ENOSYS;
fqs->qs_incoredqs = state.s_incoredqs;
/*
* GETXSTATV quotactl has space for just one set of time limits so
* report them for the first enabled quota type
*/
for (type = 0; type < XQM_MAXQUOTAS; type++)
if (state.s_state[type].flags & QCI_ACCT_ENABLED)
break;
BUG_ON(type == XQM_MAXQUOTAS);
fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
if (state.s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) {
fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
}
if (state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) {
fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
}
if (state.s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) {
fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino;
fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks;
fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents;
}
return 0;
}

static int quota_getxstatev(struct super_block *sb, void __user *addr)
{
struct fs_quota_statv fqs;
int ret;

if (!sb->s_qcop->get_xstatev)
if (!sb->s_qcop->get_xstatev && !sb->s_qcop->get_state)
return -ENOSYS;

memset(&fqs, 0, sizeof(fqs));
Expand All @@ -301,7 +428,10 @@ static int quota_getxstatev(struct super_block *sb, void __user *addr)
default:
return -EINVAL;
}
ret = sb->s_qcop->get_xstatev(sb, &fqs);
if (sb->s_qcop->get_state)
ret = quota_getstatev(sb, &fqs);
else
ret = sb->s_qcop->get_xstatev(sb, &fqs);
if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
return -EFAULT;
return ret;
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