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 |
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 | |