7283bccb37a6bcdd018179b140fa264a0f8188a4
[pandora-kernel.git] / fs / xfs / quota / xfs_qm_bhv.c
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_bit.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_dir2.h"
27 #include "xfs_alloc.h"
28 #include "xfs_quota.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_ialloc.h"
38 #include "xfs_itable.h"
39 #include "xfs_btree.h"
40 #include "xfs_bmap.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_rw.h"
44 #include "xfs_attr.h"
45 #include "xfs_buf_item.h"
46 #include "xfs_qm.h"
47
48
49 STATIC void
50 xfs_fill_statvfs_from_dquot(
51         struct kstatfs          *statp,
52         xfs_disk_dquot_t        *dp)
53 {
54         __uint64_t              limit;
55
56         limit = dp->d_blk_softlimit ?
57                 be64_to_cpu(dp->d_blk_softlimit) :
58                 be64_to_cpu(dp->d_blk_hardlimit);
59         if (limit && statp->f_blocks > limit) {
60                 statp->f_blocks = limit;
61                 statp->f_bfree = statp->f_bavail =
62                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
63                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
64         }
65
66         limit = dp->d_ino_softlimit ?
67                 be64_to_cpu(dp->d_ino_softlimit) :
68                 be64_to_cpu(dp->d_ino_hardlimit);
69         if (limit && statp->f_files > limit) {
70                 statp->f_files = limit;
71                 statp->f_ffree =
72                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
73                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
74         }
75 }
76
77
78 /*
79  * Directory tree accounting is implemented using project quotas, where
80  * the project identifier is inherited from parent directories.
81  * A statvfs (df, etc.) of a directory that is using project quota should
82  * return a statvfs of the project, not the entire filesystem.
83  * This makes such trees appear as if they are filesystems in themselves.
84  */
85 void
86 xfs_qm_statvfs(
87         xfs_inode_t             *ip,
88         struct kstatfs          *statp)
89 {
90         xfs_mount_t             *mp = ip->i_mount;
91         xfs_dquot_t             *dqp;
92
93         if (!xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp)) {
94                 xfs_fill_statvfs_from_dquot(statp, &dqp->q_core);
95                 xfs_qm_dqput(dqp);
96         }
97 }
98
99 int
100 xfs_qm_newmount(
101         xfs_mount_t     *mp,
102         uint            *needquotamount,
103         uint            *quotaflags)
104 {
105         uint            quotaondisk;
106         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
107
108         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
109                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
110
111         if (quotaondisk) {
112                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
113                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
114                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
115         }
116
117         /*
118          * If the device itself is read-only, we can't allow
119          * the user to change the state of quota on the mount -
120          * this would generate a transaction on the ro device,
121          * which would lead to an I/O error and shutdown
122          */
123
124         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
125             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
126              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
127             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
128              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
129             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
130             xfs_dev_is_read_only(mp, "changing quota state")) {
131                 cmn_err(CE_WARN,
132                         "XFS: please mount with%s%s%s%s.",
133                         (!quotaondisk ? "out quota" : ""),
134                         (uquotaondisk ? " usrquota" : ""),
135                         (pquotaondisk ? " prjquota" : ""),
136                         (gquotaondisk ? " grpquota" : ""));
137                 return XFS_ERROR(EPERM);
138         }
139
140         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
141                 /*
142                  * Call mount_quotas at this point only if we won't have to do
143                  * a quotacheck.
144                  */
145                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
146                         /*
147                          * If an error occured, qm_mount_quotas code
148                          * has already disabled quotas. So, just finish
149                          * mounting, and get on with the boring life
150                          * without disk quotas.
151                          */
152                         xfs_qm_mount_quotas(mp);
153                 } else {
154                         /*
155                          * Clear the quota flags, but remember them. This
156                          * is so that the quota code doesn't get invoked
157                          * before we're ready. This can happen when an
158                          * inode goes inactive and wants to free blocks,
159                          * or via xfs_log_mount_finish.
160                          */
161                         *needquotamount = B_TRUE;
162                         *quotaflags = mp->m_qflags;
163                         mp->m_qflags = 0;
164                 }
165         }
166
167         return 0;
168 }
169
170 void __init
171 xfs_qm_init(void)
172 {
173         printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
174         mutex_init(&xfs_Gqm_lock);
175         xfs_qm_init_procfs();
176 }
177
178 void __exit
179 xfs_qm_exit(void)
180 {
181         xfs_qm_cleanup_procfs();
182         if (qm_dqzone)
183                 kmem_zone_destroy(qm_dqzone);
184         if (qm_dqtrxzone)
185                 kmem_zone_destroy(qm_dqtrxzone);
186 }