Line data    Source code

       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_quota.h"
      13             : #include "xfs_mount.h"
      14             : #include "xfs_inode.h"
      15             : #include "xfs_trans.h"
      16             : #include "xfs_qm.h"
      17             : 
      18             : 
      19             : STATIC void
      20         608 : xfs_fill_statvfs_from_dquot(
      21             :         struct kstatfs          *statp,
      22             :         struct xfs_dquot        *dqp)
      23             : {
      24         608 :         uint64_t                limit;
      25             : 
      26         608 :         limit = dqp->q_blk.softlimit ?
      27         608 :                 dqp->q_blk.softlimit :
      28             :                 dqp->q_blk.hardlimit;
      29         608 :         if (limit && statp->f_blocks > limit) {
      30         474 :                 statp->f_blocks = limit;
      31         474 :                 statp->f_bfree = statp->f_bavail =
      32         474 :                         (statp->f_blocks > dqp->q_blk.reserved) ?
      33         474 :                          (statp->f_blocks - dqp->q_blk.reserved) : 0;
      34             :         }
      35             : 
      36         608 :         limit = dqp->q_ino.softlimit ?
      37         608 :                 dqp->q_ino.softlimit :
      38             :                 dqp->q_ino.hardlimit;
      39         608 :         if (limit && statp->f_files > limit) {
      40         228 :                 statp->f_files = limit;
      41         228 :                 statp->f_ffree =
      42         228 :                         (statp->f_files > dqp->q_ino.reserved) ?
      43         228 :                          (statp->f_files - dqp->q_ino.reserved) : 0;
      44             :         }
      45         608 : }
      46             : 
      47             : 
      48             : /*
      49             :  * Directory tree accounting is implemented using project quotas, where
      50             :  * the project identifier is inherited from parent directories.
      51             :  * A statvfs (df, etc.) of a directory that is using project quota should
      52             :  * return a statvfs of the project, not the entire filesystem.
      53             :  * This makes such trees appear as if they are filesystems in themselves.
      54             :  */
      55             : void
      56         608 : xfs_qm_statvfs(
      57             :         struct xfs_inode        *ip,
      58             :         struct kstatfs          *statp)
      59             : {
      60         608 :         struct xfs_mount        *mp = ip->i_mount;
      61         608 :         struct xfs_dquot        *dqp;
      62             : 
      63         608 :         if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
      64         608 :                 xfs_fill_statvfs_from_dquot(statp, dqp);
      65         608 :                 xfs_qm_dqput(dqp);
      66             :         }
      67         608 : }
      68             : 
      69             : int
      70       20367 : xfs_qm_newmount(
      71             :         xfs_mount_t     *mp,
      72             :         uint            *needquotamount,
      73             :         uint            *quotaflags)
      74             : {
      75       20367 :         uint            quotaondisk;
      76       20367 :         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
      77             : 
      78       20367 :         quotaondisk = xfs_has_quota(mp) &&
      79       17553 :                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
      80             : 
      81       20367 :         if (quotaondisk) {
      82       17533 :                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
      83       17533 :                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
      84       17533 :                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
      85             :         }
      86             : 
      87             :         /*
      88             :          * If the device itself is read-only, we can't allow
      89             :          * the user to change the state of quota on the mount -
      90             :          * this would generate a transaction on the ro device,
      91             :          * which would lead to an I/O error and shutdown
      92             :          */
      93             : 
      94       20367 :         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
      95       20347 :             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
      96       17551 :              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
      97       17543 :             (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
      98       17493 :              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
      99        3096 :             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
     100        2916 :             xfs_dev_is_read_only(mp, "changing quota state")) {
     101          12 :                 xfs_warn(mp, "please mount with%s%s%s%s.",
     102             :                         (!quotaondisk ? "out quota" : ""),
     103             :                         (uquotaondisk ? " usrquota" : ""),
     104             :                         (gquotaondisk ? " grpquota" : ""),
     105             :                         (pquotaondisk ? " prjquota" : ""));
     106           4 :                 return -EPERM;
     107             :         }
     108             : 
     109       20363 :         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
     110             :                 /*
     111             :                  * Call mount_quotas at this point only if we won't have to do
     112             :                  * a quotacheck.
     113             :                  */
     114       20363 :                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
     115             :                         /*
     116             :                          * If an error occurred, qm_mount_quotas code
     117             :                          * has already disabled quotas. So, just finish
     118             :                          * mounting, and get on with the boring life
     119             :                          * without disk quotas.
     120             :                          */
     121       17423 :                         xfs_qm_mount_quotas(mp);
     122             :                 } else {
     123             :                         /*
     124             :                          * Clear the quota flags, but remember them. This
     125             :                          * is so that the quota code doesn't get invoked
     126             :                          * before we're ready. This can happen when an
     127             :                          * inode goes inactive and wants to free blocks,
     128             :                          * or via xfs_log_mount_finish.
     129             :                          */
     130        2940 :                         *needquotamount = true;
     131        2940 :                         *quotaflags = mp->m_qflags;
     132        2940 :                         mp->m_qflags = 0;
     133             :                 }
     134             :         }
     135             : 
     136             :         return 0;
     137             : }