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 xfs_fill_statvfs_from_dquot( 21 struct kstatfs *statp, 22 struct xfs_dquot *dqp) 23 { 24 uint64_t limit; 25 26 limit = dqp->q_blk.softlimit ? 27 dqp->q_blk.softlimit : 28 dqp->q_blk.hardlimit; 29 if (limit && statp->f_blocks > limit) { 30 statp->f_blocks = limit; 31 statp->f_bfree = statp->f_bavail = 32 (statp->f_blocks > dqp->q_blk.reserved) ? 33 (statp->f_blocks - dqp->q_blk.reserved) : 0; 34 } 35 36 limit = dqp->q_ino.softlimit ? 37 dqp->q_ino.softlimit : 38 dqp->q_ino.hardlimit; 39 if (limit && statp->f_files > limit) { 40 statp->f_files = limit; 41 statp->f_ffree = 42 (statp->f_files > dqp->q_ino.reserved) ? 43 (statp->f_files - dqp->q_ino.reserved) : 0; 44 } 45 } 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 xfs_qm_statvfs( 57 struct xfs_inode *ip, 58 struct kstatfs *statp) 59 { 60 struct xfs_mount *mp = ip->i_mount; 61 struct xfs_dquot *dqp; 62 63 if (!xfs_qm_dqget(mp, ip->i_d.di_projid, XFS_DQTYPE_PROJ, false, &dqp)) { 64 xfs_fill_statvfs_from_dquot(statp, dqp); 65 xfs_qm_dqput(dqp); 66 } 67 } 68 69 int 70 xfs_qm_newmount( 71 xfs_mount_t *mp, 72 uint *needquotamount, 73 uint *quotaflags) 74 { 75 uint quotaondisk; 76 uint uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0; 77 78 quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) && 79 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT); 80 81 if (quotaondisk) { 82 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT; 83 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT; 84 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 if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) || 95 (!uquotaondisk && XFS_IS_UQUOTA_ON(mp)) || 96 (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) || 97 (!gquotaondisk && XFS_IS_GQUOTA_ON(mp)) || 98 (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) || 99 (!pquotaondisk && XFS_IS_PQUOTA_ON(mp))) && 100 xfs_dev_is_read_only(mp, "changing quota state")) { 101 xfs_warn(mp, "please mount with%s%s%s%s.", 102 (!quotaondisk ? "out quota" : ""), 103 (uquotaondisk ? " usrquota" : ""), 104 (gquotaondisk ? " grpquota" : ""), 105 (pquotaondisk ? " prjquota" : "")); 106 return -EPERM; 107 } 108 109 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 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 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 *needquotamount = true; 131 *quotaflags = mp->m_qflags; 132 mp->m_qflags = 0; 133 } 134 } 135 136 return 0; 137 } 138