fs/xfs/xfs_qm_bhv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_quota.h"
  14 #include "xfs_inode.h"
  15 #include "xfs_trans.h"
  16 #include "xfs_qm.h"
  17
  18
  19 STATIC void
  20 xfs_fill_statvfs_from_dquot(
  21         struct kstatfs          *statp,
  22         struct xfs_inode        *ip,
  23         struct xfs_dquot        *dqp)
  24 {
  25         struct xfs_dquot_res    *blkres = &dqp->q_blk;
  26         uint64_t                limit;
  27
  28         if (XFS_IS_REALTIME_MOUNT(ip->i_mount) &&
  29             (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME)))
  30                 blkres = &dqp->q_rtb;
  31
  32         limit = blkres->softlimit ?
  33                 blkres->softlimit :
  34                 blkres->hardlimit;
  35         if (limit && statp->f_blocks > limit) {
  36                 statp->f_blocks = limit;
  37                 statp->f_bfree = statp->f_bavail =
  38                         (statp->f_blocks > blkres->reserved) ?
  39                          (statp->f_blocks - blkres->reserved) : 0;
  40         }
  41
  42         limit = dqp->q_ino.softlimit ?
  43                 dqp->q_ino.softlimit :
  44                 dqp->q_ino.hardlimit;
  45         if (limit && statp->f_files > limit) {
  46                 statp->f_files = limit;
  47                 statp->f_ffree =
  48                         (statp->f_files > dqp->q_ino.reserved) ?
  49                          (statp->f_files - dqp->q_ino.reserved) : 0;
  50         }
  51 }
  52
  53
  54 /*
  55  * Directory tree accounting is implemented using project quotas, where
  56  * the project identifier is inherited from parent directories.
  57  * A statvfs (df, etc.) of a directory that is using project quota should
  58  * return a statvfs of the project, not the entire filesystem.
  59  * This makes such trees appear as if they are filesystems in themselves.
  60  */
  61 void
  62 xfs_qm_statvfs(
  63         struct xfs_inode        *ip,
  64         struct kstatfs          *statp)
  65 {
  66         struct xfs_mount        *mp = ip->i_mount;
  67         struct xfs_dquot        *dqp;
  68
  69         if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
  70                 xfs_fill_statvfs_from_dquot(statp, ip, dqp);
  71                 xfs_qm_dqput(dqp);
  72         }
  73 }
  74
  75 int
  76 xfs_qm_newmount(
  77         xfs_mount_t     *mp,
  78         uint            *needquotamount,
  79         uint            *quotaflags)
  80 {
  81         uint            quotaondisk;
  82         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
  83
  84         quotaondisk = xfs_has_quota(mp) &&
  85                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
  86
  87         if (quotaondisk) {
  88                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
  89                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
  90                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
  91         }
  92
  93         /*
  94          * If the device itself is read-only, we can't allow
  95          * the user to change the state of quota on the mount -
  96          * this would generate a transaction on the ro device,
  97          * which would lead to an I/O error and shutdown
  98          */
  99
 100         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 101             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 102              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 103             (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
 104              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 105             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
 106             xfs_dev_is_read_only(mp, "changing quota state")) {
 107                 xfs_warn(mp, "please mount with%s%s%s%s.",
 108                         (!quotaondisk ? "out quota" : ""),
 109                         (uquotaondisk ? " usrquota" : ""),
 110                         (gquotaondisk ? " grpquota" : ""),
 111                         (pquotaondisk ? " prjquota" : ""));
 112                 return -EPERM;
 113         }
 114
 115         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 116                 /*
 117                  * Call mount_quotas at this point only if we won't have to do
 118                  * a quotacheck.
 119                  */
 120                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 121                         /*
 122                          * If an error occurred, qm_mount_quotas code
 123                          * has already disabled quotas. So, just finish
 124                          * mounting, and get on with the boring life
 125                          * without disk quotas.
 126                          */
 127                         xfs_qm_mount_quotas(mp);
 128                 } else {
 129                         /*
 130                          * Clear the quota flags, but remember them. This
 131                          * is so that the quota code doesn't get invoked
 132                          * before we're ready. This can happen when an
 133                          * inode goes inactive and wants to free blocks,
 134                          * or via xfs_log_mount_finish.
 135                          */
 136                         *needquotamount = true;
 137                         *quotaflags = mp->m_qflags;
 138                         mp->m_qflags = 0;
 139                 }
 140         }
 141
 142         return 0;
 143 }
 144
 145 /*
 146  * If the sysadmin didn't provide any quota mount options, restore the quota
 147  * accounting and enforcement state from the ondisk superblock.  Only do this
 148  * for metadir filesystems because this is a behavior change.
 149  */
 150 void
 151 xfs_qm_resume_quotaon(
 152         struct xfs_mount        *mp)
 153 {
 154         if (!xfs_has_metadir(mp))
 155                 return;
 156         if (xfs_has_norecovery(mp))
 157                 return;
 158
 159         mp->m_qflags = mp->m_sb.sb_qflags & (XFS_ALL_QUOTA_ACCT |
 160                                              XFS_ALL_QUOTA_ENFD);
 161 }