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
xfs_fill_statvfs_from_dquot(struct kstatfs * statp,struct xfs_inode * ip,struct xfs_dquot * dqp)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 statp->f_bavail = min(statp->f_bavail, remaining);
44 }
45
46 limit = dqp->q_ino.softlimit ?
47 dqp->q_ino.softlimit :
48 dqp->q_ino.hardlimit;
49 if (limit) {
50 uint64_t remaining = 0;
51
52 if (limit > dqp->q_ino.reserved)
53 remaining = limit - dqp->q_ino.reserved;
54
55 statp->f_files = min(statp->f_files, limit);
56 statp->f_ffree = min(statp->f_ffree, remaining);
57 }
58 }
59
60
61 /*
62 * Directory tree accounting is implemented using project quotas, where
63 * the project identifier is inherited from parent directories.
64 * A statvfs (df, etc.) of a directory that is using project quota should
65 * return a statvfs of the project, not the entire filesystem.
66 * This makes such trees appear as if they are filesystems in themselves.
67 */
68 void
xfs_qm_statvfs(struct xfs_inode * ip,struct kstatfs * statp)69 xfs_qm_statvfs(
70 struct xfs_inode *ip,
71 struct kstatfs *statp)
72 {
73 struct xfs_mount *mp = ip->i_mount;
74 struct xfs_dquot *dqp;
75
76 if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
77 xfs_fill_statvfs_from_dquot(statp, ip, dqp);
78 xfs_qm_dqput(dqp);
79 }
80 }
81
82 STATIC int
xfs_qm_validate_state_change(struct xfs_mount * mp,uint uqd,uint gqd,uint pqd)83 xfs_qm_validate_state_change(
84 struct xfs_mount *mp,
85 uint uqd,
86 uint gqd,
87 uint pqd)
88 {
89 int state;
90
91 /* Is quota state changing? */
92 state = ((uqd && !XFS_IS_UQUOTA_ON(mp)) ||
93 (!uqd && XFS_IS_UQUOTA_ON(mp)) ||
94 (gqd && !XFS_IS_GQUOTA_ON(mp)) ||
95 (!gqd && XFS_IS_GQUOTA_ON(mp)) ||
96 (pqd && !XFS_IS_PQUOTA_ON(mp)) ||
97 (!pqd && XFS_IS_PQUOTA_ON(mp)));
98
99 return state &&
100 (xfs_dev_is_read_only(mp, "changing quota state") ||
101 xfs_has_norecovery(mp));
102 }
103
104 int
xfs_qm_newmount(xfs_mount_t * mp,uint * needquotamount,uint * quotaflags)105 xfs_qm_newmount(
106 xfs_mount_t *mp,
107 uint *needquotamount,
108 uint *quotaflags)
109 {
110 uint quotaondisk;
111 uint uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
112
113 quotaondisk = xfs_has_quota(mp) &&
114 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
115
116 if (quotaondisk) {
117 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
118 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
119 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
120 }
121
122 /*
123 * If the device itself is read-only and/or in norecovery
124 * mode, we can't allow the user to change the state of
125 * quota on the mount - this would generate a transaction
126 * on the ro device, which would lead to an I/O error and
127 * shutdown.
128 */
129
130 if (xfs_qm_validate_state_change(mp, uquotaondisk,
131 gquotaondisk, pquotaondisk)) {
132
133 xfs_warn(mp, "please mount with%s%s%s%s.",
134 (!quotaondisk ? "out quota" : ""),
135 (uquotaondisk ? " usrquota" : ""),
136 (gquotaondisk ? " grpquota" : ""),
137 (pquotaondisk ? " prjquota" : ""));
138 return -EPERM;
139 }
140
141 if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
142 /*
143 * Call mount_quotas at this point only if we won't have to do
144 * a quotacheck.
145 */
146 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
147 /*
148 * If an error occurred, qm_mount_quotas code
149 * has already disabled quotas. So, just finish
150 * mounting, and get on with the boring life
151 * without disk quotas.
152 */
153 xfs_qm_mount_quotas(mp);
154 } else {
155 /*
156 * Clear the quota flags, but remember them. This
157 * is so that the quota code doesn't get invoked
158 * before we're ready. This can happen when an
159 * inode goes inactive and wants to free blocks,
160 * or via xfs_log_mount_finish.
161 */
162 *needquotamount = true;
163 *quotaflags = mp->m_qflags;
164 mp->m_qflags = 0;
165 }
166 }
167
168 return 0;
169 }
170