Merge branch 'v3.10/topic/mm-timer' into linux-linaro-lsk-v3.10
[firefly-linux-kernel-4.4.55.git] / fs / xfs / 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_log.h"
21 #include "xfs_trans.h"
22 #include "xfs_sb.h"
23 #include "xfs_ag.h"
24 #include "xfs_alloc.h"
25 #include "xfs_quota.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_inode.h"
29 #include "xfs_itable.h"
30 #include "xfs_bmap.h"
31 #include "xfs_rtalloc.h"
32 #include "xfs_error.h"
33 #include "xfs_attr.h"
34 #include "xfs_buf_item.h"
35 #include "xfs_qm.h"
36
37
38 STATIC void
39 xfs_fill_statvfs_from_dquot(
40         struct kstatfs          *statp,
41         struct xfs_dquot        *dqp)
42 {
43         __uint64_t              limit;
44
45         limit = dqp->q_core.d_blk_softlimit ?
46                 be64_to_cpu(dqp->q_core.d_blk_softlimit) :
47                 be64_to_cpu(dqp->q_core.d_blk_hardlimit);
48         if (limit && statp->f_blocks > limit) {
49                 statp->f_blocks = limit;
50                 statp->f_bfree = statp->f_bavail =
51                         (statp->f_blocks > dqp->q_res_bcount) ?
52                          (statp->f_blocks - dqp->q_res_bcount) : 0;
53         }
54
55         limit = dqp->q_core.d_ino_softlimit ?
56                 be64_to_cpu(dqp->q_core.d_ino_softlimit) :
57                 be64_to_cpu(dqp->q_core.d_ino_hardlimit);
58         if (limit && statp->f_files > limit) {
59                 statp->f_files = limit;
60                 statp->f_ffree =
61                         (statp->f_files > dqp->q_res_icount) ?
62                          (statp->f_ffree - dqp->q_res_icount) : 0;
63         }
64 }
65
66
67 /*
68  * Directory tree accounting is implemented using project quotas, where
69  * the project identifier is inherited from parent directories.
70  * A statvfs (df, etc.) of a directory that is using project quota should
71  * return a statvfs of the project, not the entire filesystem.
72  * This makes such trees appear as if they are filesystems in themselves.
73  */
74 void
75 xfs_qm_statvfs(
76         xfs_inode_t             *ip,
77         struct kstatfs          *statp)
78 {
79         xfs_mount_t             *mp = ip->i_mount;
80         xfs_dquot_t             *dqp;
81
82         if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
83                 xfs_fill_statvfs_from_dquot(statp, dqp);
84                 xfs_qm_dqput(dqp);
85         }
86 }
87
88 int
89 xfs_qm_newmount(
90         xfs_mount_t     *mp,
91         uint            *needquotamount,
92         uint            *quotaflags)
93 {
94         uint            quotaondisk;
95         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
96
97         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
98                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
99
100         if (quotaondisk) {
101                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
102                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
103                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
104         }
105
106         /*
107          * If the device itself is read-only, we can't allow
108          * the user to change the state of quota on the mount -
109          * this would generate a transaction on the ro device,
110          * which would lead to an I/O error and shutdown
111          */
112
113         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
114             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
115              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
116             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
117              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
118             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
119             xfs_dev_is_read_only(mp, "changing quota state")) {
120                 xfs_warn(mp, "please mount with%s%s%s%s.",
121                         (!quotaondisk ? "out quota" : ""),
122                         (uquotaondisk ? " usrquota" : ""),
123                         (pquotaondisk ? " prjquota" : ""),
124                         (gquotaondisk ? " grpquota" : ""));
125                 return XFS_ERROR(EPERM);
126         }
127
128         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
129                 /*
130                  * Call mount_quotas at this point only if we won't have to do
131                  * a quotacheck.
132                  */
133                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
134                         /*
135                          * If an error occurred, qm_mount_quotas code
136                          * has already disabled quotas. So, just finish
137                          * mounting, and get on with the boring life
138                          * without disk quotas.
139                          */
140                         xfs_qm_mount_quotas(mp);
141                 } else {
142                         /*
143                          * Clear the quota flags, but remember them. This
144                          * is so that the quota code doesn't get invoked
145                          * before we're ready. This can happen when an
146                          * inode goes inactive and wants to free blocks,
147                          * or via xfs_log_mount_finish.
148                          */
149                         *needquotamount = true;
150                         *quotaflags = mp->m_qflags;
151                         mp->m_qflags = 0;
152                 }
153         }
154
155         return 0;
156 }