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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_quota.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_qm.h"
STATIC void
xfs_fill_statvfs_from_dquot(
struct kstatfs *statp,
struct xfs_inode *ip,
struct xfs_dquot *dqp)
{
struct xfs_dquot_res *blkres = &dqp->q_blk;
uint64_t limit;
if (XFS_IS_REALTIME_MOUNT(ip->i_mount) &&
(ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME)))
blkres = &dqp->q_rtb;
limit = blkres->softlimit ?
blkres->softlimit :
blkres->hardlimit;
if (limit) {
uint64_t remaining = 0;
if (limit > blkres->reserved)
remaining = limit - blkres->reserved;
statp->f_blocks = min(statp->f_blocks, limit);
statp->f_bfree = min(statp->f_bfree, remaining);
}
limit = dqp->q_ino.softlimit ?
dqp->q_ino.softlimit :
dqp->q_ino.hardlimit;
if (limit) {
uint64_t remaining = 0;
if (limit > dqp->q_ino.reserved)
remaining = limit - dqp->q_ino.reserved;
statp->f_files = min(statp->f_files, limit);
statp->f_ffree = min(statp->f_ffree, remaining);
}
}
/*
* Directory tree accounting is implemented using project quotas, where
* the project identifier is inherited from parent directories.
* A statvfs (df, etc.) of a directory that is using project quota should
* return a statvfs of the project, not the entire filesystem.
* This makes such trees appear as if they are filesystems in themselves.
*/
void
xfs_qm_statvfs(
struct xfs_inode *ip,
struct kstatfs *statp)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_dquot *dqp;
if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
xfs_fill_statvfs_from_dquot(statp, ip, dqp);
xfs_qm_dqput(dqp);
}
}
STATIC int
xfs_qm_validate_state_change(
struct xfs_mount *mp,
uint uqd,
uint gqd,
uint pqd)
{
int state;
/* Is quota state changing? */
state = ((uqd && !XFS_IS_UQUOTA_ON(mp)) ||
(!uqd && XFS_IS_UQUOTA_ON(mp)) ||
(gqd && !XFS_IS_GQUOTA_ON(mp)) ||
(!gqd && XFS_IS_GQUOTA_ON(mp)) ||
(pqd && !XFS_IS_PQUOTA_ON(mp)) ||
(!pqd && XFS_IS_PQUOTA_ON(mp)));
return state &&
(xfs_dev_is_read_only(mp, "changing quota state") ||
xfs_has_norecovery(mp));
}
int
xfs_qm_newmount(
xfs_mount_t *mp,
uint *needquotamount,
uint *quotaflags)
{
uint quotaondisk;
uint uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
quotaondisk = xfs_has_quota(mp) &&
(mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
if (quotaondisk) {
uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
}
/*
* If the device itself is read-only and/or in norecovery
* mode, we can't allow the user to change the state of
* quota on the mount - this would generate a transaction
* on the ro device, which would lead to an I/O error and
* shutdown.
*/
if (xfs_qm_validate_state_change(mp, uquotaondisk,
gquotaondisk, pquotaondisk)) {
if (xfs_has_metadir(mp))
xfs_warn(mp,
"metadir enabled, please mount without any quota mount options");
else
xfs_warn(mp, "please mount with%s%s%s%s.",
(!quotaondisk ? "out quota" : ""),
(uquotaondisk ? " usrquota" : ""),
(gquotaondisk ? " grpquota" : ""),
(pquotaondisk ? " prjquota" : ""));
return -EPERM;
}
if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
/*
* Call mount_quotas at this point only if we won't have to do
* a quotacheck.
*/
if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
/*
* If an error occurred, qm_mount_quotas code
* has already disabled quotas. So, just finish
* mounting, and get on with the boring life
* without disk quotas.
*/
xfs_qm_mount_quotas(mp);
} else {
/*
* Clear the quota flags, but remember them. This
* is so that the quota code doesn't get invoked
* before we're ready. This can happen when an
* inode goes inactive and wants to free blocks,
* or via xfs_log_mount_finish.
*/
*needquotamount = true;
*quotaflags = mp->m_qflags;
mp->m_qflags = 0;
}
}
return 0;
}
/*
* If the sysadmin didn't provide any quota mount options, restore the quota
* accounting and enforcement state from the ondisk superblock. Only do this
* for metadir filesystems because this is a behavior change.
*/
void
xfs_qm_resume_quotaon(
struct xfs_mount *mp)
{
if (!xfs_has_metadir(mp))
return;
if (xfs_has_norecovery(mp))
return;
mp->m_qflags = mp->m_sb.sb_qflags & (XFS_ALL_QUOTA_ACCT |
XFS_ALL_QUOTA_ENFD);
}
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