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) { 36 uint64_t remaining = 0; 37 38 if (limit > blkres->reserved) 39 remaining = limit - blkres->reserved; 40 41 statp->f_blocks = min(statp->f_blocks, limit); 42 statp->f_bfree = min(statp->f_bfree, remaining); 43 } 44 45 limit = dqp->q_ino.softlimit ? 46 dqp->q_ino.softlimit : 47 dqp->q_ino.hardlimit; 48 if (limit) { 49 uint64_t remaining = 0; 50 51 if (limit > dqp->q_ino.reserved) 52 remaining = limit - dqp->q_ino.reserved; 53 54 statp->f_files = min(statp->f_files, limit); 55 statp->f_ffree = min(statp->f_ffree, remaining); 56 } 57 } 58 59 60 /* 61 * Directory tree accounting is implemented using project quotas, where 62 * the project identifier is inherited from parent directories. 63 * A statvfs (df, etc.) of a directory that is using project quota should 64 * return a statvfs of the project, not the entire filesystem. 65 * This makes such trees appear as if they are filesystems in themselves. 66 */ 67 void 68 xfs_qm_statvfs( 69 struct xfs_inode *ip, 70 struct kstatfs *statp) 71 { 72 struct xfs_mount *mp = ip->i_mount; 73 struct xfs_dquot *dqp; 74 75 if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) { 76 xfs_fill_statvfs_from_dquot(statp, ip, dqp); 77 xfs_qm_dqput(dqp); 78 } 79 } 80 81 int 82 xfs_qm_newmount( 83 xfs_mount_t *mp, 84 uint *needquotamount, 85 uint *quotaflags) 86 { 87 uint quotaondisk; 88 uint uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0; 89 90 quotaondisk = xfs_has_quota(mp) && 91 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT); 92 93 if (quotaondisk) { 94 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT; 95 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT; 96 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT; 97 } 98 99 /* 100 * If the device itself is read-only, we can't allow 101 * the user to change the state of quota on the mount - 102 * this would generate a transaction on the ro device, 103 * which would lead to an I/O error and shutdown 104 */ 105 106 if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) || 107 (!uquotaondisk && XFS_IS_UQUOTA_ON(mp)) || 108 (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) || 109 (!gquotaondisk && XFS_IS_GQUOTA_ON(mp)) || 110 (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) || 111 (!pquotaondisk && XFS_IS_PQUOTA_ON(mp))) && 112 xfs_dev_is_read_only(mp, "changing quota state")) { 113 xfs_warn(mp, "please mount with%s%s%s%s.", 114 (!quotaondisk ? "out quota" : ""), 115 (uquotaondisk ? " usrquota" : ""), 116 (gquotaondisk ? " grpquota" : ""), 117 (pquotaondisk ? " prjquota" : "")); 118 return -EPERM; 119 } 120 121 if (XFS_IS_QUOTA_ON(mp) || quotaondisk) { 122 /* 123 * Call mount_quotas at this point only if we won't have to do 124 * a quotacheck. 125 */ 126 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) { 127 /* 128 * If an error occurred, qm_mount_quotas code 129 * has already disabled quotas. So, just finish 130 * mounting, and get on with the boring life 131 * without disk quotas. 132 */ 133 xfs_qm_mount_quotas(mp); 134 } else { 135 /* 136 * Clear the quota flags, but remember them. This 137 * is so that the quota code doesn't get invoked 138 * before we're ready. This can happen when an 139 * inode goes inactive and wants to free blocks, 140 * or via xfs_log_mount_finish. 141 */ 142 *needquotamount = true; 143 *quotaflags = mp->m_qflags; 144 mp->m_qflags = 0; 145 } 146 } 147 148 return 0; 149 } 150 151 /* 152 * If the sysadmin didn't provide any quota mount options, restore the quota 153 * accounting and enforcement state from the ondisk superblock. Only do this 154 * for metadir filesystems because this is a behavior change. 155 */ 156 void 157 xfs_qm_resume_quotaon( 158 struct xfs_mount *mp) 159 { 160 if (!xfs_has_metadir(mp)) 161 return; 162 if (xfs_has_norecovery(mp)) 163 return; 164 165 mp->m_qflags = mp->m_sb.sb_qflags & (XFS_ALL_QUOTA_ACCT | 166 XFS_ALL_QUOTA_ENFD); 167 } 168