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Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / fs / xfs / xfs_qm_bhv.c
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_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 && statp->f_blocks > limit) {
36                 statp->f_blocks = limit;
37                 statp->f_bfree = statp->f_bavail =
38                         (statp->f_blocks > blkres->reserved) ?
39                          (statp->f_blocks - blkres->reserved) : 0;
40         }
41
42         limit = dqp->q_ino.softlimit ?
43                 dqp->q_ino.softlimit :
44                 dqp->q_ino.hardlimit;
45         if (limit && statp->f_files > limit) {
46                 statp->f_files = limit;
47                 statp->f_ffree =
48                         (statp->f_files > dqp->q_ino.reserved) ?
49                          (statp->f_files - dqp->q_ino.reserved) : 0;
50         }
51 }
52
53
54 /*
55  * Directory tree accounting is implemented using project quotas, where
56  * the project identifier is inherited from parent directories.
57  * A statvfs (df, etc.) of a directory that is using project quota should
58  * return a statvfs of the project, not the entire filesystem.
59  * This makes such trees appear as if they are filesystems in themselves.
60  */
61 void
62 xfs_qm_statvfs(
63         struct xfs_inode        *ip,
64         struct kstatfs          *statp)
65 {
66         struct xfs_mount        *mp = ip->i_mount;
67         struct xfs_dquot        *dqp;
68
69         if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
70                 xfs_fill_statvfs_from_dquot(statp, ip, dqp);
71                 xfs_qm_dqput(dqp);
72         }
73 }
74
75 int
76 xfs_qm_newmount(
77         xfs_mount_t     *mp,
78         uint            *needquotamount,
79         uint            *quotaflags)
80 {
81         uint            quotaondisk;
82         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
83
84         quotaondisk = xfs_has_quota(mp) &&
85                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
86
87         if (quotaondisk) {
88                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
89                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
90                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
91         }
92
93         /*
94          * If the device itself is read-only, we can't allow
95          * the user to change the state of quota on the mount -
96          * this would generate a transaction on the ro device,
97          * which would lead to an I/O error and shutdown
98          */
99
100         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
101             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
102              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
103             (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
104              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
105             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
106             xfs_dev_is_read_only(mp, "changing quota state")) {
107                 xfs_warn(mp, "please mount with%s%s%s%s.",
108                         (!quotaondisk ? "out quota" : ""),
109                         (uquotaondisk ? " usrquota" : ""),
110                         (gquotaondisk ? " grpquota" : ""),
111                         (pquotaondisk ? " prjquota" : ""));
112                 return -EPERM;
113         }
114
115         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
116                 /*
117                  * Call mount_quotas at this point only if we won't have to do
118                  * a quotacheck.
119                  */
120                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
121                         /*
122                          * If an error occurred, qm_mount_quotas code
123                          * has already disabled quotas. So, just finish
124                          * mounting, and get on with the boring life
125                          * without disk quotas.
126                          */
127                         xfs_qm_mount_quotas(mp);
128                 } else {
129                         /*
130                          * Clear the quota flags, but remember them. This
131                          * is so that the quota code doesn't get invoked
132                          * before we're ready. This can happen when an
133                          * inode goes inactive and wants to free blocks,
134                          * or via xfs_log_mount_finish.
135                          */
136                         *needquotamount = true;
137                         *quotaflags = mp->m_qflags;
138                         mp->m_qflags = 0;
139                 }
140         }
141
142         return 0;
143 }
144
145 /*
146  * If the sysadmin didn't provide any quota mount options, restore the quota
147  * accounting and enforcement state from the ondisk superblock.  Only do this
148  * for metadir filesystems because this is a behavior change.
149  */
150 void
151 xfs_qm_resume_quotaon(
152         struct xfs_mount        *mp)
153 {
154         if (!xfs_has_metadir(mp))
155                 return;
156         if (xfs_has_norecovery(mp))
157                 return;
158
159         mp->m_qflags = mp->m_sb.sb_qflags & (XFS_ALL_QUOTA_ACCT |
160                                              XFS_ALL_QUOTA_ENFD);
161 }
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