summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_qm_bhv.c
blob: fa9797382d5b153547ab35c6966d4468573c9858 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_error.h"
#include "xfs_trans.h"
#include "xfs_qm.h"


STATIC void
xfs_fill_statvfs_from_dquot(
	struct kstatfs		*statp,
	struct xfs_dquot	*dqp)
{
	__uint64_t		limit;

	limit = dqp->q_core.d_blk_softlimit ?
		be64_to_cpu(dqp->q_core.d_blk_softlimit) :
		be64_to_cpu(dqp->q_core.d_blk_hardlimit);
	if (limit && statp->f_blocks > limit) {
		statp->f_blocks = limit;
		statp->f_bfree = statp->f_bavail =
			(statp->f_blocks > dqp->q_res_bcount) ?
			 (statp->f_blocks - dqp->q_res_bcount) : 0;
	}

	limit = dqp->q_core.d_ino_softlimit ?
		be64_to_cpu(dqp->q_core.d_ino_softlimit) :
		be64_to_cpu(dqp->q_core.d_ino_hardlimit);
	if (limit && statp->f_files > limit) {
		statp->f_files = limit;
		statp->f_ffree =
			(statp->f_files > dqp->q_res_icount) ?
			 (statp->f_ffree - dqp->q_res_icount) : 0;
	}
}


/*
 * Directory tree accounting is implemented using project quotas, where
 * the project identifier is inherited from parent directories.
 * A statvfs (df, etc.) of a directory that is using project quota should
 * return a statvfs of the project, not the entire filesystem.
 * This makes such trees appear as if they are filesystems in themselves.
 */
void
xfs_qm_statvfs(
	xfs_inode_t		*ip,
	struct kstatfs		*statp)
{
	xfs_mount_t		*mp = ip->i_mount;
	xfs_dquot_t		*dqp;

	if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
		xfs_fill_statvfs_from_dquot(statp, dqp);
		xfs_qm_dqput(dqp);
	}
}

int
xfs_qm_newmount(
	xfs_mount_t	*mp,
	uint		*needquotamount,
	uint		*quotaflags)
{
	uint		quotaondisk;
	uint		uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;

	quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
				(mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);

	if (quotaondisk) {
		uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
		pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
		gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
	}

	/*
	 * If the device itself is read-only, we can't allow
	 * the user to change the state of quota on the mount -
	 * this would generate a transaction on the ro device,
	 * which would lead to an I/O error and shutdown
	 */

	if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
	    (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
	     (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
	    (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
	     (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
	    (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
	    xfs_dev_is_read_only(mp, "changing quota state")) {
		xfs_warn(mp, "please mount with%s%s%s%s.",
			(!quotaondisk ? "out quota" : ""),
			(uquotaondisk ? " usrquota" : ""),
			(gquotaondisk ? " grpquota" : ""),
			(pquotaondisk ? " prjquota" : ""));
		return EPERM;
	}

	if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
		/*
		 * Call mount_quotas at this point only if we won't have to do
		 * a quotacheck.
		 */
		if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
			/*
			 * If an error occurred, qm_mount_quotas code
			 * has already disabled quotas. So, just finish
			 * mounting, and get on with the boring life
			 * without disk quotas.
			 */
			xfs_qm_mount_quotas(mp);
		} else {
			/*
			 * Clear the quota flags, but remember them. This
			 * is so that the quota code doesn't get invoked
			 * before we're ready. This can happen when an
			 * inode goes inactive and wants to free blocks,
			 * or via xfs_log_mount_finish.
			 */
			*needquotamount = true;
			*quotaflags = mp->m_qflags;
			mp->m_qflags = 0;
		}
	}

	return 0;
}