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review.evervolv.com / android_kernel_htc_msm8960 / be539c73b54dcc9f54fb2c2b70e204c93b616c9b / . / fs / xfs / quota / xfs_qm.h
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Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32#ifndef __XFS_QM_H__
33#define __XFS_QM_H__
34
35#include "xfs_dquot_item.h"
36#include "xfs_dquot.h"
37#include "xfs_quota_priv.h"
38#include "xfs_qm_stats.h"
39
40struct xfs_qm;
41struct xfs_inode;
42
43extern mutex_t xfs_Gqm_lock;
44extern struct xfs_qm *xfs_Gqm;
45extern kmem_zone_t *qm_dqzone;
46extern kmem_zone_t *qm_dqtrxzone;
47
48/*
49 * Used in xfs_qm_sync called by xfs_sync to count the max times that it can
50 * iterate over the mountpt's dquot list in one call.
51 */
52#define XFS_QM_SYNC_MAX_RESTARTS 7
53
54/*
55 * Ditto, for xfs_qm_dqreclaim_one.
56 */
57#define XFS_QM_RECLAIM_MAX_RESTARTS 4
58
59/*
60 * Ideal ratio of free to in use dquots. Quota manager makes an attempt
61 * to keep this balance.
62 */
63#define XFS_QM_DQFREE_RATIO 2
64
65/*
66 * Dquot hashtable constants/threshold values.
67 */
68#define XFS_QM_NCSIZE_THRESHOLD 5000
69#define XFS_QM_HASHSIZE_LOW 32
70#define XFS_QM_HASHSIZE_HIGH 64
71
72/*
73 * We output a cmn_err when quotachecking a quota file with more than
74 * this many fsbs.
75 */
76#define XFS_QM_BIG_QCHECK_NBLKS 500
77
78/*
79 * This defines the unit of allocation of dquots.
80 * Currently, it is just one file system block, and a 4K blk contains 30
81 * (136 * 30 = 4080) dquots. It's probably not worth trying to make
82 * this more dynamic.
83 * XXXsup However, if this number is changed, we have to make sure that we don't
84 * implicitly assume that we do allocations in chunks of a single filesystem
85 * block in the dquot/xqm code.
86 */
87#define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1
88/*
89 * When doing a quotacheck, we log dquot clusters of this many FSBs at most
90 * in a single transaction. We don't want to ask for too huge a log reservation.
91 */
92#define XFS_QM_MAX_DQCLUSTER_LOGSZ 3
93
94typedef xfs_dqhash_t xfs_dqlist_t;
95/*
96 * The freelist head. The first two fields match the first two in the
97 * xfs_dquot_t structure (in xfs_dqmarker_t)
98 */
99typedef struct xfs_frlist {
100 struct xfs_dquot *qh_next;
101 struct xfs_dquot *qh_prev;
102 mutex_t qh_lock;
103 uint qh_version;
104 uint qh_nelems;
105} xfs_frlist_t;
106
107/*
108 * Quota Manager (global) structure. Lives only in core.
109 */
110typedef struct xfs_qm {
111 xfs_dqlist_t *qm_usr_dqhtable;/* udquot hash table */
112 xfs_dqlist_t *qm_grp_dqhtable;/* gdquot hash table */
113 uint qm_dqhashmask; /* # buckets in dq hashtab - 1 */
114 xfs_frlist_t qm_dqfreelist; /* freelist of dquots */
115 atomic_t qm_totaldquots; /* total incore dquots */
116 uint qm_nrefs; /* file systems with quota on */
117 int qm_dqfree_ratio;/* ratio of free to inuse dquots */
118 kmem_zone_t *qm_dqzone; /* dquot mem-alloc zone */
119 kmem_zone_t *qm_dqtrxzone; /* t_dqinfo of transactions */
120} xfs_qm_t;
121
122/*
123 * Various quota information for individual filesystems.
124 * The mount structure keeps a pointer to this.
125 */
126typedef struct xfs_quotainfo {
127 xfs_inode_t *qi_uquotaip; /* user quota inode */
128 xfs_inode_t *qi_gquotaip; /* group quota inode */
129 lock_t qi_pinlock; /* dquot pinning mutex */
130 xfs_dqlist_t qi_dqlist; /* all dquots in filesys */
131 int qi_dqreclaims; /* a change here indicates
132 a removal in the dqlist */
133 time_t qi_btimelimit; /* limit for blks timer */
134 time_t qi_itimelimit; /* limit for inodes timer */
135 time_t qi_rtbtimelimit;/* limit for rt blks timer */
136 xfs_qwarncnt_t qi_bwarnlimit; /* limit for num warnings */
137 xfs_qwarncnt_t qi_iwarnlimit; /* limit for num warnings */
138 mutex_t qi_quotaofflock;/* to serialize quotaoff */
139 xfs_filblks_t qi_dqchunklen; /* # BBs in a chunk of dqs */
140 uint qi_dqperchunk; /* # ondisk dqs in above chunk */
141 xfs_qcnt_t qi_bhardlimit; /* default data blk hard limit */
142 xfs_qcnt_t qi_bsoftlimit; /* default data blk soft limit */
143 xfs_qcnt_t qi_ihardlimit; /* default inode count hard limit */
144 xfs_qcnt_t qi_isoftlimit; /* default inode count soft limit */
145 xfs_qcnt_t qi_rtbhardlimit;/* default realtime blk hard limit */
146 xfs_qcnt_t qi_rtbsoftlimit;/* default realtime blk soft limit */
147} xfs_quotainfo_t;
148
149
150extern xfs_dqtrxops_t xfs_trans_dquot_ops;
151
152extern void xfs_trans_mod_dquot(xfs_trans_t *, xfs_dquot_t *, uint, long);
153extern int xfs_trans_reserve_quota_bydquots(xfs_trans_t *, xfs_mount_t *,
154 xfs_dquot_t *, xfs_dquot_t *, long, long, uint);
155extern void xfs_trans_dqjoin(xfs_trans_t *, xfs_dquot_t *);
156extern void xfs_trans_log_dquot(xfs_trans_t *, xfs_dquot_t *);
157
158/*
159 * We keep the usr and grp dquots separately so that locking will be easier
160 * to do at commit time. All transactions that we know of at this point
161 * affect no more than two dquots of one type. Hence, the TRANS_MAXDQS value.
162 */
163#define XFS_QM_TRANS_MAXDQS 2
164typedef struct xfs_dquot_acct {
165 xfs_dqtrx_t dqa_usrdquots[XFS_QM_TRANS_MAXDQS];
166 xfs_dqtrx_t dqa_grpdquots[XFS_QM_TRANS_MAXDQS];
167} xfs_dquot_acct_t;
168
169/*
170 * Users are allowed to have a usage exceeding their softlimit for
171 * a period this long.
172 */
173#define XFS_QM_BTIMELIMIT (7 * 24*60*60) /* 1 week */
174#define XFS_QM_RTBTIMELIMIT (7 * 24*60*60) /* 1 week */
175#define XFS_QM_ITIMELIMIT (7 * 24*60*60) /* 1 week */
176
177#define XFS_QM_BWARNLIMIT 5
178#define XFS_QM_IWARNLIMIT 5
179
180#define XFS_QM_LOCK(xqm) (mutex_lock(&xqm##_lock, PINOD))
181#define XFS_QM_UNLOCK(xqm) (mutex_unlock(&xqm##_lock))
182#define XFS_QM_HOLD(xqm) ((xqm)->qm_nrefs++)
183#define XFS_QM_RELE(xqm) ((xqm)->qm_nrefs--)
184
185extern void xfs_mount_reset_sbqflags(xfs_mount_t *);
186
187extern int xfs_qm_init_quotainfo(xfs_mount_t *);
188extern void xfs_qm_destroy_quotainfo(xfs_mount_t *);
189extern int xfs_qm_mount_quotas(xfs_mount_t *, int);
190extern void xfs_qm_mount_quotainit(xfs_mount_t *, uint);
191extern int xfs_qm_quotacheck(xfs_mount_t *);
192extern void xfs_qm_unmount_quotadestroy(xfs_mount_t *);
193extern int xfs_qm_unmount_quotas(xfs_mount_t *);
194extern int xfs_qm_write_sb_changes(xfs_mount_t *, __int64_t);
195extern int xfs_qm_sync(xfs_mount_t *, short);
196
197/* dquot stuff */
198extern boolean_t xfs_qm_dqalloc_incore(xfs_dquot_t **);
199extern int xfs_qm_dqattach(xfs_inode_t *, uint);
200extern void xfs_qm_dqdetach(xfs_inode_t *);
201extern int xfs_qm_dqpurge_all(xfs_mount_t *, uint);
202extern void xfs_qm_dqrele_all_inodes(xfs_mount_t *, uint);
203
204/* vop stuff */
205extern int xfs_qm_vop_dqalloc(xfs_mount_t *, xfs_inode_t *,
206 uid_t, gid_t, uint,
207 xfs_dquot_t **, xfs_dquot_t **);
208extern void xfs_qm_vop_dqattach_and_dqmod_newinode(
209 xfs_trans_t *, xfs_inode_t *,
210 xfs_dquot_t *, xfs_dquot_t *);
211extern int xfs_qm_vop_rename_dqattach(xfs_inode_t **);
212extern xfs_dquot_t * xfs_qm_vop_chown(xfs_trans_t *, xfs_inode_t *,
213 xfs_dquot_t **, xfs_dquot_t *);
214extern int xfs_qm_vop_chown_reserve(xfs_trans_t *, xfs_inode_t *,
215 xfs_dquot_t *, xfs_dquot_t *, uint);
216
217/* list stuff */
218extern void xfs_qm_freelist_init(xfs_frlist_t *);
219extern void xfs_qm_freelist_destroy(xfs_frlist_t *);
220extern void xfs_qm_freelist_insert(xfs_frlist_t *, xfs_dquot_t *);
221extern void xfs_qm_freelist_append(xfs_frlist_t *, xfs_dquot_t *);
222extern void xfs_qm_freelist_unlink(xfs_dquot_t *);
223extern int xfs_qm_freelist_lock_nowait(xfs_qm_t *);
224extern int xfs_qm_mplist_nowait(xfs_mount_t *);
225extern int xfs_qm_dqhashlock_nowait(xfs_dquot_t *);
226
227/* system call interface */
228extern int xfs_qm_quotactl(bhv_desc_t *, int, int, xfs_caddr_t);
229
230#ifdef DEBUG
231extern int xfs_qm_internalqcheck(xfs_mount_t *);
232#else
233#define xfs_qm_internalqcheck(mp) (0)
234#endif
235
236#endif /* __XFS_QM_H__ */