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_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_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_has_quota(mp) &&
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
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