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24 * Copyright (c) 2012, Intel Corporation.
25 * Use is subject to license terms.
28 #ifndef _QMT_INTERNAL_H
29 #define _QMT_INTERNAL_H
31 #include <lustre_mdt.h> /* err_serious() */
32 #include "lquota_internal.h"
35 * The Quota Master Target Device.
36 * The qmt is responsible for:
37 * - all interactions with MDT0 (provide request handlers, share ldlm namespace,
38 * manage ldlm lvbo, ...)
39 * - all quota lock management (i.e. global quota locks as well as per-ID locks)
40 * - manage the quota pool configuration
42 * That's the structure MDT0 connects to in mdt_quota_init().
45 /* Super-class. dt_device/lu_device for this master target */
46 struct dt_device qmt_dt_dev;
48 /* service name of this qmt */
49 char qmt_svname[MAX_OBD_NAME];
51 /* Reference to the next device in the side stack
52 * The child device is actually the OSD device where we store the quota
54 struct obd_export *qmt_child_exp;
55 struct dt_device *qmt_child;
57 /* pointer to ldlm namespace to be used for quota locks */
58 struct ldlm_namespace *qmt_ns;
60 /* Hash table containing a qmt_pool_info structure for each pool
61 * this quota master is in charge of. We only have 2 pools in this
62 * hash for the time being:
63 * - one for quota management on the default metadata pool
64 * - one for quota managment on the default data pool
66 * Once we support quota on non-default pools, then more pools will
67 * be added to this hash table and pool master setup would have to be
68 * handled via configuration logs */
69 cfs_hash_t *qmt_pool_hash;
71 /* List of pools managed by this master target */
72 cfs_list_t qmt_pool_list;
74 /* procfs root directory for this qmt */
75 cfs_proc_dir_entry_t *qmt_proc;
77 /* dedicated thread in charge of space rebalancing */
78 struct ptlrpc_thread qmt_reba_thread;
80 /* list of lqe entry which need space rebalancing */
81 cfs_list_t qmt_reba_list;
83 /* lock protecting rebalancing list */
84 spinlock_t qmt_reba_lock;
86 unsigned long qmt_stopping:1; /* qmt is stopping */
91 * Per-pool quota information.
92 * The qmt creates one such structure for each pool
93 * with quota enforced. All the structures are kept in a hash which is used to
94 * determine whether or not quota is enforced for a given pool.
95 * We currently only support the default data pool and default metadata pool
98 struct qmt_pool_info {
99 /* link to qmt's pool hash */
100 cfs_hlist_node_t qpi_hash;
102 /* chained list of all pools managed by the same qmt */
103 cfs_list_t qpi_linkage;
105 /* Pool key composed of pool_id | (pool_type << 16)
106 * Only pool ID 0 is supported for now and the pool type is either
107 * QUOTA_RES_MD or QUOTA_RES_DT.
108 * immutable after creation. */
111 /* track users of this pool instance */
112 cfs_atomic_t qpi_ref;
114 /* back pointer to master target
115 * immutable after creation. */
116 struct qmt_device *qpi_qmt;
118 /* pointer to dt object associated with global indexes for both user
120 struct dt_object *qpi_glb_obj[MAXQUOTAS];
122 /* A pool supports two different quota types: user and group quota.
123 * Each quota type has its own global index and lquota_entry hash table.
125 struct lquota_site *qpi_site[MAXQUOTAS];
127 /* number of slaves registered for each quota types */
128 int qpi_slv_nr[MAXQUOTAS];
130 /* reference on lqe (ID 0) storing grace time. */
131 struct lquota_entry *qpi_grace_lqe[MAXQUOTAS];
133 /* procfs root directory for this pool */
134 cfs_proc_dir_entry_t *qpi_proc;
136 /* pool directory where all indexes related to this pool instance are
138 struct dt_object *qpi_root;
140 /* Global quota parameters which apply to all quota type */
141 /* the least value of qunit */
142 unsigned long qpi_least_qunit;
146 * Helper routines and prototypes
149 /* helper routine to find qmt_pool_info associated a lquota_entry */
150 static inline struct qmt_pool_info *lqe2qpi(struct lquota_entry *lqe)
152 LASSERT(lqe_is_master(lqe));
153 return (struct qmt_pool_info *)lqe->lqe_site->lqs_parent;
156 /* return true if someone holds either a read or write lock on the lqe */
157 static inline bool lqe_is_locked(struct lquota_entry *lqe)
159 LASSERT(lqe_is_master(lqe));
160 if (down_write_trylock(&lqe->lqe_sem) == 0)
162 lqe_write_unlock(lqe);
166 /* value to be restored if someone wrong happens during lqe writeback */
167 struct qmt_lqe_restore {
175 /* Common data shared by qmt handlers */
176 struct qmt_thread_info {
177 union lquota_rec qti_rec;
178 union lquota_id qti_id;
179 char qti_buf[MTI_NAME_MAXLEN];
180 struct lu_fid qti_fid;
181 struct ldlm_res_id qti_resid;
182 union ldlm_gl_desc qti_gl_desc;
183 struct quota_body qti_body;
184 struct qmt_lqe_restore qti_restore;
187 extern struct lu_context_key qmt_thread_key;
189 /* helper function to extract qmt_thread_info from current environment */
191 struct qmt_thread_info *qmt_info(const struct lu_env *env)
193 struct qmt_thread_info *info;
195 info = lu_context_key_get(&env->le_ctx, &qmt_thread_key);
197 lu_env_refill((struct lu_env *)env);
198 info = lu_context_key_get(&env->le_ctx, &qmt_thread_key);
204 /* helper routine to convert a lu_device into a qmt_device */
205 static inline struct qmt_device *lu2qmt_dev(struct lu_device *ld)
207 return container_of0(lu2dt_dev(ld), struct qmt_device, qmt_dt_dev);
210 /* helper routine to convert a qmt_device into lu_device */
211 static inline struct lu_device *qmt2lu_dev(struct qmt_device *qmt)
213 return &qmt->qmt_dt_dev.dd_lu_dev;
216 #define LQE_ROOT(lqe) (lqe2qpi(lqe)->qpi_root)
217 #define LQE_GLB_OBJ(lqe) (lqe2qpi(lqe)->qpi_glb_obj[lqe->lqe_site->lqs_qtype])
219 /* helper function returning grace time to use for a given lquota entry */
220 static inline __u64 qmt_lqe_grace(struct lquota_entry *lqe)
222 struct qmt_pool_info *pool = lqe2qpi(lqe);
223 struct lquota_entry *grace_lqe;
225 grace_lqe = pool->qpi_grace_lqe[lqe->lqe_site->lqs_qtype];
226 LASSERT(grace_lqe != NULL);
228 return grace_lqe->lqe_gracetime;
231 static inline void qmt_restore(struct lquota_entry *lqe,
232 struct qmt_lqe_restore *restore)
234 lqe->lqe_hardlimit = restore->qlr_hardlimit;
235 lqe->lqe_softlimit = restore->qlr_softlimit;
236 lqe->lqe_gracetime = restore->qlr_gracetime;
237 lqe->lqe_granted = restore->qlr_granted;
238 lqe->lqe_qunit = restore->qlr_qunit;
241 #define QMT_GRANT(lqe, slv, cnt) \
243 (lqe)->lqe_granted += (cnt); \
246 #define QMT_REL(lqe, slv, cnt) \
248 (lqe)->lqe_granted -= (cnt); \
252 /* helper routine returning true when the id has run out of quota space, which
253 * means that it has either:
254 * - reached hardlimit
256 * - reached softlimit and grace time expired already */
257 static inline bool qmt_space_exhausted(struct lquota_entry *lqe, __u64 now)
259 if (lqe->lqe_hardlimit != 0 && lqe->lqe_granted >= lqe->lqe_hardlimit)
261 if (lqe->lqe_softlimit != 0 && lqe->lqe_granted > lqe->lqe_softlimit &&
262 lqe->lqe_gracetime != 0 && now >= lqe->lqe_gracetime)
267 /* number of seconds to wait for slaves to release quota space after
269 #define QMT_REBA_TIMEOUT 2
272 void qmt_pool_fini(const struct lu_env *, struct qmt_device *);
273 int qmt_pool_init(const struct lu_env *, struct qmt_device *);
274 int qmt_pool_prepare(const struct lu_env *, struct qmt_device *,
276 int qmt_pool_new_conn(const struct lu_env *, struct qmt_device *,
277 struct lu_fid *, struct lu_fid *, __u64 *,
279 struct lquota_entry *qmt_pool_lqe_lookup(const struct lu_env *,
280 struct qmt_device *, int, int, int,
283 extern struct lquota_entry_operations qmt_lqe_ops;
284 struct thandle *qmt_trans_start_with_slv(const struct lu_env *,
285 struct lquota_entry *,
287 struct qmt_lqe_restore *);
288 struct thandle *qmt_trans_start(const struct lu_env *, struct lquota_entry *,
289 struct qmt_lqe_restore *);
290 int qmt_glb_write(const struct lu_env *, struct thandle *,
291 struct lquota_entry *, __u32, __u64 *);
292 int qmt_slv_write(const struct lu_env *, struct thandle *,
293 struct lquota_entry *, struct dt_object *, __u32, __u64 *,
295 int qmt_slv_read(const struct lu_env *, struct lquota_entry *,
296 struct dt_object *, __u64 *);
297 int qmt_validate_limits(struct lquota_entry *, __u64, __u64);
298 void qmt_adjust_qunit(const struct lu_env *, struct lquota_entry *);
299 void qmt_adjust_edquot(struct lquota_entry *, __u64);
300 void qmt_revalidate(const struct lu_env *, struct lquota_entry *);
301 __u64 qmt_alloc_expand(struct lquota_entry *, __u64, __u64);
304 int qmt_dqacq0(const struct lu_env *, struct lquota_entry *,
305 struct qmt_device *, struct obd_uuid *, __u32, __u64, __u64,
306 struct quota_body *);
309 int qmt_intent_policy(const struct lu_env *, struct lu_device *,
310 struct ptlrpc_request *, struct ldlm_lock **, int);
311 int qmt_lvbo_init(struct lu_device *, struct ldlm_resource *);
312 int qmt_lvbo_update(struct lu_device *, struct ldlm_resource *,
313 struct ptlrpc_request *, int);
314 int qmt_lvbo_size(struct lu_device *, struct ldlm_lock *);
315 int qmt_lvbo_fill(struct lu_device *, struct ldlm_lock *, void *, int);
316 int qmt_lvbo_free(struct lu_device *, struct ldlm_resource *);
317 int qmt_start_reba_thread(struct qmt_device *);
318 void qmt_stop_reba_thread(struct qmt_device *);
319 void qmt_glb_lock_notify(const struct lu_env *, struct lquota_entry *, __u64);
320 void qmt_id_lock_notify(struct qmt_device *, struct lquota_entry *);
321 #endif /* _QMT_INTERNAL_H */