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