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
20STATIC void
21xfs_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 */
56void
57xfs_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
70int
71xfs_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

source code of linux/fs/xfs/xfs_qm_bhv.c