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_mount.h"
  15 #include "xfs_inode.h"
  16 #include "xfs_trans.h"
  17 #include "xfs_qm.h"
  18
  19
  20 STATIC void
  21 xfs_fill_statvfs_from_dquot(
  22         struct kstatfs          *statp,
  23         struct xfs_dquot        *dqp)
  24 {
  25         uint64_t                limit;
  26
  27         limit = dqp->q_blk.softlimit ?
  28                 dqp->q_blk.softlimit :
  29                 dqp->q_blk.hardlimit;
  30         if (limit && statp->f_blocks > limit) {
  31                 statp->f_blocks = limit;
  32                 statp->f_bfree = statp->f_bavail =
  33                         (statp->f_blocks > dqp->q_blk.reserved) ?
  34                          (statp->f_blocks - dqp->q_blk.reserved) : 0;
  35         }
  36
  37         limit = dqp->q_ino.softlimit ?
  38                 dqp->q_ino.softlimit :
  39                 dqp->q_ino.hardlimit;
  40         if (limit && statp->f_files > limit) {
  41                 statp->f_files = limit;
  42                 statp->f_ffree =
  43                         (statp->f_files > dqp->q_ino.reserved) ?
  44                          (statp->f_files - dqp->q_ino.reserved) : 0;
  45         }
  46 }
  47
  48
  49 /*
  50  * Directory tree accounting is implemented using project quotas, where
  51  * the project identifier is inherited from parent directories.
  52  * A statvfs (df, etc.) of a directory that is using project quota should
  53  * return a statvfs of the project, not the entire filesystem.
  54  * This makes such trees appear as if they are filesystems in themselves.
  55  */
  56 void
  57 xfs_qm_statvfs(
  58         struct xfs_inode        *ip,
  59         struct kstatfs          *statp)
  60 {
  61         struct xfs_mount        *mp = ip->i_mount;
  62         struct xfs_dquot        *dqp;
  63
  64         if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
  65                 xfs_fill_statvfs_from_dquot(statp, dqp);
  66                 xfs_qm_dqput(dqp);
  67         }
  68 }
  69
  70 int
  71 xfs_qm_newmount(
  72         xfs_mount_t     *mp,
  73         uint            *needquotamount,
  74         uint            *quotaflags)
  75 {
  76         uint            quotaondisk;
  77         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
  78
  79         quotaondisk = xfs_has_quota(mp) &&
  80                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
  81
  82         if (quotaondisk) {
  83                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
  84                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
  85                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
  86         }
  87
  88         /*
  89          * If the device itself is read-only, we can't allow
  90          * the user to change the state of quota on the mount -
  91          * this would generate a transaction on the ro device,
  92          * which would lead to an I/O error and shutdown
  93          */
  94
  95         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
  96             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
  97              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
  98             (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
  99              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 100             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
 101             xfs_dev_is_read_only(mp, "changing quota state")) {
 102                 xfs_warn(mp, "please mount with%s%s%s%s.",
 103                         (!quotaondisk ? "out quota" : ""),
 104                         (uquotaondisk ? " usrquota" : ""),
 105                         (gquotaondisk ? " grpquota" : ""),
 106                         (pquotaondisk ? " prjquota" : ""));
 107                 return -EPERM;
 108         }
 109
 110         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 111                 /*
 112                  * Call mount_quotas at this point only if we won't have to do
 113                  * a quotacheck.
 114                  */
 115                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 116                         /*
 117                          * If an error occurred, qm_mount_quotas code
 118                          * has already disabled quotas. So, just finish
 119                          * mounting, and get on with the boring life
 120                          * without disk quotas.
 121                          */
 122                         xfs_qm_mount_quotas(mp);
 123                 } else {
 124                         /*
 125                          * Clear the quota flags, but remember them. This
 126                          * is so that the quota code doesn't get invoked
 127                          * before we're ready. This can happen when an
 128                          * inode goes inactive and wants to free blocks,
 129                          * or via xfs_log_mount_finish.
 130                          */
 131                         *needquotamount = true;
 132                         *quotaflags = mp->m_qflags;
 133                         mp->m_qflags = 0;
 134                 }
 135         }
 136
 137         return 0;
 138 }