Merge branch 'master' into for-linus
[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_dmapi.h"
29 #include "xfs_quota.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_ialloc.h"
39 #include "xfs_itable.h"
40 #include "xfs_btree.h"
41 #include "xfs_bmap.h"
42 #include "xfs_rtalloc.h"
43 #include "xfs_error.h"
44 #include "xfs_rw.h"
45 #include "xfs_attr.h"
46 #include "xfs_buf_item.h"
47 #include "xfs_qm.h"
48
49
50 STATIC void
51 xfs_fill_statvfs_from_dquot(
52         struct kstatfs          *statp,
53         xfs_disk_dquot_t        *dp)
54 {
55         __uint64_t              limit;
56
57         limit = dp->d_blk_softlimit ?
58                 be64_to_cpu(dp->d_blk_softlimit) :
59                 be64_to_cpu(dp->d_blk_hardlimit);
60         if (limit && statp->f_blocks > limit) {
61                 statp->f_blocks = limit;
62                 statp->f_bfree = statp->f_bavail =
63                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
64                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
65         }
66
67         limit = dp->d_ino_softlimit ?
68                 be64_to_cpu(dp->d_ino_softlimit) :
69                 be64_to_cpu(dp->d_ino_hardlimit);
70         if (limit && statp->f_files > limit) {
71                 statp->f_files = limit;
72                 statp->f_ffree =
73                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
74                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
75         }
76 }
77
78
79 /*
80  * Directory tree accounting is implemented using project quotas, where
81  * the project identifier is inherited from parent directories.
82  * A statvfs (df, etc.) of a directory that is using project quota should
83  * return a statvfs of the project, not the entire filesystem.
84  * This makes such trees appear as if they are filesystems in themselves.
85  */
86 void
87 xfs_qm_statvfs(
88         xfs_inode_t             *ip,
89         struct kstatfs          *statp)
90 {
91         xfs_mount_t             *mp = ip->i_mount;
92         xfs_dquot_t             *dqp;
93
94         if (!xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp)) {
95                 xfs_fill_statvfs_from_dquot(statp, &dqp->q_core);
96                 xfs_qm_dqput(dqp);
97         }
98 }
99
100 int
101 xfs_qm_newmount(
102         xfs_mount_t     *mp,
103         uint            *needquotamount,
104         uint            *quotaflags)
105 {
106         uint            quotaondisk;
107         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
108
109         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
110                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
111
112         if (quotaondisk) {
113                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
114                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
115                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
116         }
117
118         /*
119          * If the device itself is read-only, we can't allow
120          * the user to change the state of quota on the mount -
121          * this would generate a transaction on the ro device,
122          * which would lead to an I/O error and shutdown
123          */
124
125         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
126             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
127              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
128             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
129              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
130             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
131             xfs_dev_is_read_only(mp, "changing quota state")) {
132                 cmn_err(CE_WARN,
133                         "XFS: please mount with%s%s%s%s.",
134                         (!quotaondisk ? "out quota" : ""),
135                         (uquotaondisk ? " usrquota" : ""),
136                         (pquotaondisk ? " prjquota" : ""),
137                         (gquotaondisk ? " grpquota" : ""));
138                 return XFS_ERROR(EPERM);
139         }
140
141         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
142                 /*
143                  * Call mount_quotas at this point only if we won't have to do
144                  * a quotacheck.
145                  */
146                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
147                         /*
148                          * If an error occured, qm_mount_quotas code
149                          * has already disabled quotas. So, just finish
150                          * mounting, and get on with the boring life
151                          * without disk quotas.
152                          */
153                         xfs_qm_mount_quotas(mp);
154                 } else {
155                         /*
156                          * Clear the quota flags, but remember them. This
157                          * is so that the quota code doesn't get invoked
158                          * before we're ready. This can happen when an
159                          * inode goes inactive and wants to free blocks,
160                          * or via xfs_log_mount_finish.
161                          */
162                         *needquotamount = B_TRUE;
163                         *quotaflags = mp->m_qflags;
164                         mp->m_qflags = 0;
165                 }
166         }
167
168         return 0;
169 }
170
171 void __init
172 xfs_qm_init(void)
173 {
174         printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
175         mutex_init(&xfs_Gqm_lock);
176         xfs_qm_init_procfs();
177 }
178
179 void __exit
180 xfs_qm_exit(void)
181 {
182         xfs_qm_cleanup_procfs();
183         if (qm_dqzone)
184                 kmem_zone_destroy(qm_dqzone);
185         if (qm_dqtrxzone)
186                 kmem_zone_destroy(qm_dqtrxzone);
187 }