1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_quota.h"
14#include "xfs_mount.h"
15#include "xfs_inode.h"
16#include "xfs_trans.h"
17#include "xfs_qm.h"
18
19
20STATIC void
21xfs_fill_statvfs_from_dquot(
22	struct kstatfs		*statp,
23	struct xfs_dquot	*dqp)
24{
25	uint64_t		limit;
26
27	limit = dqp->q_blk.softlimit ?
28		dqp->q_blk.softlimit :
29		dqp->q_blk.hardlimit;
30	if (limit && statp->f_blocks > limit) {
31		statp->f_blocks = limit;
32		statp->f_bfree = statp->f_bavail =
33			(statp->f_blocks > dqp->q_blk.reserved) ?
34			 (statp->f_blocks - dqp->q_blk.reserved) : 0;
35	}
36
37	limit = dqp->q_ino.softlimit ?
38		dqp->q_ino.softlimit :
39		dqp->q_ino.hardlimit;
40	if (limit && statp->f_files > limit) {
41		statp->f_files = limit;
42		statp->f_ffree =
43			(statp->f_files > dqp->q_ino.reserved) ?
44			 (statp->f_files - dqp->q_ino.reserved) : 0;
45	}
46}
47
48
49/*
50 * Directory tree accounting is implemented using project quotas, where
51 * the project identifier is inherited from parent directories.
52 * A statvfs (df, etc.) of a directory that is using project quota should
53 * return a statvfs of the project, not the entire filesystem.
54 * This makes such trees appear as if they are filesystems in themselves.
55 */
56void
57xfs_qm_statvfs(
58	struct xfs_inode	*ip,
59	struct kstatfs		*statp)
60{
61	struct xfs_mount	*mp = ip->i_mount;
62	struct xfs_dquot	*dqp;
63
64	if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
65		xfs_fill_statvfs_from_dquot(statp, dqp);
66		xfs_qm_dqput(dqp);
67	}
68}
69
70int
71xfs_qm_newmount(
72	xfs_mount_t	*mp,
73	uint		*needquotamount,
74	uint		*quotaflags)
75{
76	uint		quotaondisk;
77	uint		uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
78
79	quotaondisk = xfs_has_quota(mp) &&
80				(mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
81
82	if (quotaondisk) {
83		uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
84		pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
85		gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
86	}
87
88	/*
89	 * If the device itself is read-only, we can't allow
90	 * the user to change the state of quota on the mount -
91	 * this would generate a transaction on the ro device,
92	 * which would lead to an I/O error and shutdown
93	 */
94
95	if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
96	    (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
97	     (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
98	    (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
99	     (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
100	    (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
101	    xfs_dev_is_read_only(mp, "changing quota state")) {
102		xfs_warn(mp, "please mount with%s%s%s%s.",
103			(!quotaondisk ? "out quota" : ""),
104			(uquotaondisk ? " usrquota" : ""),
105			(gquotaondisk ? " grpquota" : ""),
106			(pquotaondisk ? " prjquota" : ""));
107		return -EPERM;
108	}
109
110	if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
111		/*
112		 * Call mount_quotas at this point only if we won't have to do
113		 * a quotacheck.
114		 */
115		if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
116			/*
117			 * If an error occurred, qm_mount_quotas code
118			 * has already disabled quotas. So, just finish
119			 * mounting, and get on with the boring life
120			 * without disk quotas.
121			 */
122			xfs_qm_mount_quotas(mp);
123		} else {
124			/*
125			 * Clear the quota flags, but remember them. This
126			 * is so that the quota code doesn't get invoked
127			 * before we're ready. This can happen when an
128			 * inode goes inactive and wants to free blocks,
129			 * or via xfs_log_mount_finish.
130			 */
131			*needquotamount = true;
132			*quotaflags = mp->m_qflags;
133			mp->m_qflags = 0;
134		}
135	}
136
137	return 0;
138}
139