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 } 139