xfs_qm_bhv.c revision 38c26bfd
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_quota.h"
13#include "xfs_mount.h"
14#include "xfs_inode.h"
15#include "xfs_trans.h"
16#include "xfs_qm.h"
17
18
19STATIC void
20xfs_fill_statvfs_from_dquot(
21	struct kstatfs		*statp,
22	struct xfs_dquot	*dqp)
23{
24	uint64_t		limit;
25
26	limit = dqp->q_blk.softlimit ?
27		dqp->q_blk.softlimit :
28		dqp->q_blk.hardlimit;
29	if (limit && statp->f_blocks > limit) {
30		statp->f_blocks = limit;
31		statp->f_bfree = statp->f_bavail =
32			(statp->f_blocks > dqp->q_blk.reserved) ?
33			 (statp->f_blocks - dqp->q_blk.reserved) : 0;
34	}
35
36	limit = dqp->q_ino.softlimit ?
37		dqp->q_ino.softlimit :
38		dqp->q_ino.hardlimit;
39	if (limit && statp->f_files > limit) {
40		statp->f_files = limit;
41		statp->f_ffree =
42			(statp->f_files > dqp->q_ino.reserved) ?
43			 (statp->f_files - dqp->q_ino.reserved) : 0;
44	}
45}
46
47
48/*
49 * Directory tree accounting is implemented using project quotas, where
50 * the project identifier is inherited from parent directories.
51 * A statvfs (df, etc.) of a directory that is using project quota should
52 * return a statvfs of the project, not the entire filesystem.
53 * This makes such trees appear as if they are filesystems in themselves.
54 */
55void
56xfs_qm_statvfs(
57	struct xfs_inode	*ip,
58	struct kstatfs		*statp)
59{
60	struct xfs_mount	*mp = ip->i_mount;
61	struct xfs_dquot	*dqp;
62
63	if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
64		xfs_fill_statvfs_from_dquot(statp, dqp);
65		xfs_qm_dqput(dqp);
66	}
67}
68
69int
70xfs_qm_newmount(
71	xfs_mount_t	*mp,
72	uint		*needquotamount,
73	uint		*quotaflags)
74{
75	uint		quotaondisk;
76	uint		uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
77
78	quotaondisk = xfs_has_quota(mp) &&
79				(mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
80
81	if (quotaondisk) {
82		uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
83		pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
84		gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
85	}
86
87	/*
88	 * If the device itself is read-only, we can't allow
89	 * the user to change the state of quota on the mount -
90	 * this would generate a transaction on the ro device,
91	 * which would lead to an I/O error and shutdown
92	 */
93
94	if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
95	    (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
96	     (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
97	    (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
98	     (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
99	    (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
100	    xfs_dev_is_read_only(mp, "changing quota state")) {
101		xfs_warn(mp, "please mount with%s%s%s%s.",
102			(!quotaondisk ? "out quota" : ""),
103			(uquotaondisk ? " usrquota" : ""),
104			(gquotaondisk ? " grpquota" : ""),
105			(pquotaondisk ? " prjquota" : ""));
106		return -EPERM;
107	}
108
109	if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
110		/*
111		 * Call mount_quotas at this point only if we won't have to do
112		 * a quotacheck.
113		 */
114		if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
115			/*
116			 * If an error occurred, qm_mount_quotas code
117			 * has already disabled quotas. So, just finish
118			 * mounting, and get on with the boring life
119			 * without disk quotas.
120			 */
121			xfs_qm_mount_quotas(mp);
122		} else {
123			/*
124			 * Clear the quota flags, but remember them. This
125			 * is so that the quota code doesn't get invoked
126			 * before we're ready. This can happen when an
127			 * inode goes inactive and wants to free blocks,
128			 * or via xfs_log_mount_finish.
129			 */
130			*needquotamount = true;
131			*quotaflags = mp->m_qflags;
132			mp->m_qflags = 0;
133		}
134	}
135
136	return 0;
137}
138