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
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 int
xfs_qm_newmount(xfs_mount_t * mp,uint * needquotamount,uint * quotaflags)83 xfs_qm_newmount(
84 xfs_mount_t *mp,
85 uint *needquotamount,
86 uint *quotaflags)
87 {
88 uint quotaondisk;
89 uint uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
90
91 quotaondisk = xfs_has_quota(mp) &&
92 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
93
94 if (quotaondisk) {
95 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
96 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
97 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
98 }
99
100 /*
101 * If the device itself is read-only, we can't allow
102 * the user to change the state of quota on the mount -
103 * this would generate a transaction on the ro device,
104 * which would lead to an I/O error and shutdown
105 */
106
107 if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
108 (!uquotaondisk && XFS_IS_UQUOTA_ON(mp)) ||
109 (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
110 (!gquotaondisk && XFS_IS_GQUOTA_ON(mp)) ||
111 (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
112 (!pquotaondisk && XFS_IS_PQUOTA_ON(mp))) &&
113 xfs_dev_is_read_only(mp, "changing quota state")) {
114 xfs_warn(mp, "please mount with%s%s%s%s.",
115 (!quotaondisk ? "out quota" : ""),
116 (uquotaondisk ? " usrquota" : ""),
117 (gquotaondisk ? " grpquota" : ""),
118 (pquotaondisk ? " prjquota" : ""));
119 return -EPERM;
120 }
121
122 if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
123 /*
124 * Call mount_quotas at this point only if we won't have to do
125 * a quotacheck.
126 */
127 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
128 /*
129 * If an error occurred, qm_mount_quotas code
130 * has already disabled quotas. So, just finish
131 * mounting, and get on with the boring life
132 * without disk quotas.
133 */
134 xfs_qm_mount_quotas(mp);
135 } else {
136 /*
137 * Clear the quota flags, but remember them. This
138 * is so that the quota code doesn't get invoked
139 * before we're ready. This can happen when an
140 * inode goes inactive and wants to free blocks,
141 * or via xfs_log_mount_finish.
142 */
143 *needquotamount = true;
144 *quotaflags = mp->m_qflags;
145 mp->m_qflags = 0;
146 }
147 }
148
149 return 0;
150 }
151