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24 * Copyright (c) 2011, 2012, Whamcloud, Inc.
25 * Use is subject to license terms.
28 #include <dt_object.h>
29 #include <lustre_fid.h>
30 #include <lustre_dlm.h>
32 #ifndef _LUSTRE_LQUOTA_H
33 #define _LUSTRE_LQUOTA_H
35 struct lquota_id_info;
38 /* Gather all quota record type in an union that can be used to read any records
39 * from disk. All fields of these records must be 64-bit aligned, otherwise the
40 * OSD layer may swab them incorrectly. */
42 struct lquota_glb_rec lqr_glb_rec;
43 struct lquota_slv_rec lqr_slv_rec;
44 struct lquota_acct_rec lqr_acct_rec;
47 /* Index features supported by the global index objects
48 * Only used for migration purpose and should be removed once on-disk migration
49 * is no longer needed */
50 extern struct dt_index_features dt_quota_iusr_features;
51 extern struct dt_index_features dt_quota_busr_features;
52 extern struct dt_index_features dt_quota_igrp_features;
53 extern struct dt_index_features dt_quota_bgrp_features;
55 /* Name used in the configuration logs to identify the default metadata pool
56 * (composed of all the MDTs, with pool ID 0) and the default data pool (all
57 * the OSTs, with pool ID 0 too). */
58 #define QUOTA_METAPOOL_NAME "mdt="
59 #define QUOTA_DATAPOOL_NAME "ost="
62 * Quota Master Target support
65 /* Request handlers for quota master operations.
66 * This is used by the MDT to pass quota/lock requests to the quota master
67 * target. This won't be needed any more once the QMT is a real target and
68 * does not rely any more on the MDT service threads and namespace. */
70 /* Handle quotactl request from client. */
71 int (*qmth_quotactl)(const struct lu_env *, struct lu_device *,
72 struct obd_quotactl *);
74 /* Handle dqacq/dqrel request from slave. */
75 int (*qmth_dqacq)(const struct lu_env *, struct lu_device *,
76 struct ptlrpc_request *);
78 /* LDLM intent policy associated with quota locks */
79 int (*qmth_intent_policy)(const struct lu_env *, struct lu_device *,
80 struct ptlrpc_request *, struct ldlm_lock **,
83 /* Initialize LVB of ldlm resource associated with quota objects */
84 int (*qmth_lvbo_init)(struct lu_device *, struct ldlm_resource *);
86 /* Update LVB of ldlm resource associated with quota objects */
87 int (*qmth_lvbo_update)(struct lu_device *, struct ldlm_resource *,
88 struct ptlrpc_request *, int);
90 /* Return size of LVB to be packed in ldlm message */
91 int (*qmth_lvbo_size)(struct lu_device *, struct ldlm_lock *);
93 /* Fill request buffer with lvb */
94 int (*qmth_lvbo_fill)(struct lu_device *, struct ldlm_lock *, void *,
97 /* Free lvb associated with ldlm resource */
98 int (*qmth_lvbo_free)(struct lu_device *, struct ldlm_resource *);
101 /* actual handlers are defined in lustre/quota/qmt_handler.c */
102 extern struct qmt_handlers qmt_hdls;
105 * Quota enforcement support on slaves
110 /* The quota slave feature is implemented under the form of a library.
111 * The API is the following:
113 * - qsd_init(): the user (mostly the OSD layer) should first allocate a qsd
114 * instance via qsd_init(). This creates all required structures
115 * to manage quota enforcement for this target and performs all
116 * low-level initialization which does not involve any lustre
117 * object. qsd_init() should typically be called when the OSD
120 * - qsd_prepare(): This sets up on-disk objects associated with the quota slave
121 * feature and initiates the quota reintegration procedure if
122 * needed. qsd_prepare() should typically be called when
123 * ->ldo_prepare is invoked.
125 * - qsd_start(): a qsd instance should be started once recovery is completed
126 * (i.e. when ->ldo_recovery_complete is called). This is used
127 * to notify the qsd layer that quota should now be enforced
128 * again via the qsd_op_begin/end functions. The last step of the
129 * reintegration prodecure (namely usage reconciliation) will be
130 * completed during start.
132 * - qsd_fini(): is used to release a qsd_instance structure allocated with
133 * qsd_init(). This releases all quota slave objects and frees the
134 * structures associated with the qsd_instance.
136 * - qsd_op_begin(): is used to enforce quota, it must be called in the
137 * declaration of each operation. qsd_op_end() should then be
138 * invoked later once all operations have been completed in
139 * order to release/adjust the quota space.
140 * Running qsd_op_begin() before qsd_start() isn't fatal and
141 * will return success.
142 * Once qsd_start() has been run, qsd_op_begin() will block
143 * until the reintegration procedure is completed.
145 * - qsd_op_end(): performs the post operation quota processing. This must be
146 * called after the operation transaction stopped.
147 * While qsd_op_begin() must be invoked each time a new
148 * operation is declared, qsd_op_end() should be called only
149 * once for the whole transaction.
151 * - qsd_adjust_quota(): triggers pre-acquire/release if necessary.
153 * Below are the function prototypes to be used by OSD layer to manage quota
154 * enforcement. Arguments are documented where each function is defined. */
156 struct qsd_instance *qsd_init(const struct lu_env *, char *, struct dt_device *,
157 cfs_proc_dir_entry_t *);
158 int qsd_prepare(const struct lu_env *, struct qsd_instance *);
159 int qsd_start(const struct lu_env *, struct qsd_instance *);
160 void qsd_fini(const struct lu_env *, struct qsd_instance *);
161 int qsd_op_begin(const struct lu_env *, struct qsd_instance *,
162 struct lquota_trans *, struct lquota_id_info *, int *);
163 void qsd_op_end(const struct lu_env *, struct qsd_instance *,
164 struct lquota_trans *);
165 void qsd_adjust_quota(const struct lu_env *, struct qsd_instance *,
166 union lquota_id *, int);
169 * Quota information attached to a transaction
174 struct lquota_id_info {
175 /* quota identifier */
176 union lquota_id lqi_id;
178 /* USRQUOTA or GRPQUOTA for now, could be expanded for
179 * directory quota or other types later. */
182 /* inodes or kbytes to be consumed or released, it could
183 * be negative when releasing space. */
186 /* quota slave entry structure associated with this ID */
187 struct lquota_entry *lqi_qentry;
189 /* whether we are reporting blocks or inodes */
193 /* Since we enforce only inode quota in meta pool (MDTs), and block quota in
194 * data pool (OSTs), there are at most 4 quota ids being enforced in a single
195 * transaction, which is chown transaction:
196 * original uid and gid, new uid and gid.
198 * This value might need to be revised when directory quota is added. */
199 #define QUOTA_MAX_TRANSIDS 4
201 /* all qids involved in a single transaction */
202 struct lquota_trans {
203 unsigned short lqt_id_cnt;
204 struct lquota_id_info lqt_ids[QUOTA_MAX_TRANSIDS];
207 /* flags for quota local enforcement */
208 #define QUOTA_FL_OVER_USRQUOTA 0x01
209 #define QUOTA_FL_OVER_GRPQUOTA 0x02
210 #define QUOTA_FL_SYNC 0x04
212 #define IS_LQUOTA_RES(res) \
213 (res->lr_name.name[LUSTRE_RES_ID_SEQ_OFF] == FID_SEQ_QUOTA || \
214 res->lr_name.name[LUSTRE_RES_ID_SEQ_OFF] == FID_SEQ_QUOTA_GLB)
216 /* helper function used by MDT & OFD to retrieve quota accounting information
218 int lquotactl_slv(const struct lu_env *, struct dt_device *,
219 struct obd_quotactl *);
220 #endif /* _LUSTRE_LQUOTA_H */