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1 /*
2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_format.h"
21 #include "xfs_log.h"
22 #include "xfs_trans.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.h"
25 #include "xfs_alloc.h"
26 #include "xfs_quota.h"
27 #include "xfs_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_itable.h"
31 #include "xfs_bmap.h"
32 #include "xfs_rtalloc.h"
33 #include "xfs_error.h"
34 #include "xfs_attr.h"
35 #include "xfs_buf_item.h"
36 #include "xfs_qm.h"
37
38
39 STATIC void
40 xfs_fill_statvfs_from_dquot(
41         struct kstatfs          *statp,
42         struct xfs_dquot        *dqp)
43 {
44         __uint64_t              limit;
45
46         limit = dqp->q_core.d_blk_softlimit ?
47                 be64_to_cpu(dqp->q_core.d_blk_softlimit) :
48                 be64_to_cpu(dqp->q_core.d_blk_hardlimit);
49         if (limit && statp->f_blocks > limit) {
50                 statp->f_blocks = limit;
51                 statp->f_bfree = statp->f_bavail =
52                         (statp->f_blocks > dqp->q_res_bcount) ?
53                          (statp->f_blocks - dqp->q_res_bcount) : 0;
54         }
55
56         limit = dqp->q_core.d_ino_softlimit ?
57                 be64_to_cpu(dqp->q_core.d_ino_softlimit) :
58                 be64_to_cpu(dqp->q_core.d_ino_hardlimit);
59         if (limit && statp->f_files > limit) {
60                 statp->f_files = limit;
61                 statp->f_ffree =
62                         (statp->f_files > dqp->q_res_icount) ?
63                          (statp->f_ffree - dqp->q_res_icount) : 0;
64         }
65 }
66
67
68 /*
69  * Directory tree accounting is implemented using project quotas, where
70  * the project identifier is inherited from parent directories.
71  * A statvfs (df, etc.) of a directory that is using project quota should
72  * return a statvfs of the project, not the entire filesystem.
73  * This makes such trees appear as if they are filesystems in themselves.
74  */
75 void
76 xfs_qm_statvfs(
77         xfs_inode_t             *ip,
78         struct kstatfs          *statp)
79 {
80         xfs_mount_t             *mp = ip->i_mount;
81         xfs_dquot_t             *dqp;
82
83         if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
84                 xfs_fill_statvfs_from_dquot(statp, dqp);
85                 xfs_qm_dqput(dqp);
86         }
87 }
88
89 int
90 xfs_qm_newmount(
91         xfs_mount_t     *mp,
92         uint            *needquotamount,
93         uint            *quotaflags)
94 {
95         uint            quotaondisk;
96         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
97
98         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
99                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
100
101         if (quotaondisk) {
102                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
103                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
104                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
105         }
106
107         /*
108          * If the device itself is read-only, we can't allow
109          * the user to change the state of quota on the mount -
110          * this would generate a transaction on the ro device,
111          * which would lead to an I/O error and shutdown
112          */
113
114         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
115             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
116              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
117             (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
118              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
119             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
120             xfs_dev_is_read_only(mp, "changing quota state")) {
121                 xfs_warn(mp, "please mount with%s%s%s%s.",
122                         (!quotaondisk ? "out quota" : ""),
123                         (uquotaondisk ? " usrquota" : ""),
124                         (gquotaondisk ? " grpquota" : ""),
125                         (pquotaondisk ? " prjquota" : ""));
126                 return XFS_ERROR(EPERM);
127         }
128
129         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
130                 /*
131                  * Call mount_quotas at this point only if we won't have to do
132                  * a quotacheck.
133                  */
134                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
135                         /*
136                          * If an error occurred, qm_mount_quotas code
137                          * has already disabled quotas. So, just finish
138                          * mounting, and get on with the boring life
139                          * without disk quotas.
140                          */
141                         xfs_qm_mount_quotas(mp);
142                 } else {
143                         /*
144                          * Clear the quota flags, but remember them. This
145                          * is so that the quota code doesn't get invoked
146                          * before we're ready. This can happen when an
147                          * inode goes inactive and wants to free blocks,
148                          * or via xfs_log_mount_finish.
149                          */
150                         *needquotamount = true;
151                         *quotaflags = mp->m_qflags;
152                         mp->m_qflags = 0;
153                 }
154         }
155
156         return 0;
157 }