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24 * Copyright (c) 2012 Intel, Inc.
25 * Use is subject to license terms.
28 #include "lquota_internal.h"
30 #ifndef _QMT_INTERNAL_H
31 #define _QMT_INTERNAL_H
34 * The Quota Master Target Device.
35 * The qmt is responsible for:
36 * - all interactions with MDT0 (provide request handlers, share ldlm namespace,
37 * manage ldlm lvbo, ...)
38 * - all quota lock management (i.e. global quota locks as well as per-ID locks)
39 * - manage the quota pool configuration
41 * That's the structure MDT0 connects to in mdt_quota_init().
44 /* Super-class. dt_device/lu_device for this master target */
45 struct dt_device qmt_dt_dev;
47 /* service name of this qmt */
48 char qmt_svname[MAX_OBD_NAME];
50 /* Reference to the next device in the side stack
51 * The child device is actually the OSD device where we store the quota
53 struct obd_export *qmt_child_exp;
54 struct dt_device *qmt_child;
56 /* pointer to ldlm namespace to be used for quota locks */
57 struct ldlm_namespace *qmt_ns;
59 /* Hash table containing a qmt_pool_info structure for each pool
60 * this quota master is in charge of. We only have 2 pools in this
61 * hash for the time being:
62 * - one for quota management on the default metadata pool
63 * - one for quota managment on the default data pool
65 * Once we support quota on non-default pools, then more pools will
66 * be added to this hash table and pool master setup would have to be
67 * handled via configuration logs */
68 cfs_hash_t *qmt_pool_hash;
70 /* List of pools managed by this master target */
71 cfs_list_t qmt_pool_list;
73 /* procfs root directory for this qmt */
74 cfs_proc_dir_entry_t *qmt_proc;
76 unsigned long qmt_stopping:1; /* qmt is stopping */
81 * Per-pool quota information.
82 * The qmt creates one such structure for each pool
83 * with quota enforced. All the structures are kept in a hash which is used to
84 * determine whether or not quota is enforced for a given pool.
85 * We currently only support the default data pool and default metadata pool
88 struct qmt_pool_info {
89 /* link to qmt's pool hash */
90 cfs_hlist_node_t qpi_hash;
92 /* chained list of all pools managed by the same qmt */
93 cfs_list_t qpi_linkage;
95 /* Pool key composed of pool_id | (pool_type << 16)
96 * Only pool ID 0 is supported for now and the pool type is either
97 * QUOTA_RES_MD or QUOTA_RES_DT.
98 * immutable after creation. */
101 /* track users of this pool instance */
102 cfs_atomic_t qpi_ref;
104 /* back pointer to master target
105 * immutable after creation. */
106 struct qmt_device *qpi_qmt;
108 /* pointer to dt object associated with global indexes for both user
110 struct dt_object *qpi_glb_obj[MAXQUOTAS];
112 /* A pool supports two different quota types: user and group quota.
113 * Each quota type has its own global index and lquota_entry hash table.
115 struct lquota_site *qpi_site[MAXQUOTAS];
117 /* number of slaves registered for each quota types */
118 int qpi_slv_nr[MAXQUOTAS];
120 /* procfs root directory for this pool */
121 cfs_proc_dir_entry_t *qpi_proc;
123 /* pool directory where all indexes related to this pool instance are
125 struct dt_object *qpi_root;
127 /* Global quota parameters which apply to all quota type */
128 /* the least value of qunit */
129 unsigned long qpi_least_qunit;
133 * Helper routines and prototypes
136 /* helper routine to find qmt_pool_info associated a lquota_entry */
137 static inline struct qmt_pool_info *lqe2qpi(struct lquota_entry *lqe)
139 LASSERT(lqe_is_master(lqe));
140 return (struct qmt_pool_info *)lqe->lqe_site->lqs_parent;
143 /* return true if someone holds either a read or write lock on the lqe */
144 static inline bool lqe_is_locked(struct lquota_entry *lqe)
146 LASSERT(lqe_is_master(lqe));
147 if (cfs_down_write_trylock(&lqe->lqe_sem) == 0)
149 lqe_write_unlock(lqe);
153 /* value to be restored if someone wrong happens during lqe writeback */
154 struct qmt_lqe_restore {
162 /* Common data shared by qmt handlers */
163 struct qmt_thread_info {
164 union lquota_rec qti_rec;
165 union lquota_id qti_id;
166 union lquota_id qti_id_bis;
167 char qti_buf[MTI_NAME_MAXLEN];
168 struct lu_fid qti_fid;
169 struct ldlm_res_id qti_resid;
170 union ldlm_gl_desc qti_gl_desc;
171 struct quota_body qti_body;
172 struct quota_body qti_repbody;
173 struct qmt_lqe_restore qti_restore;
176 extern struct lu_context_key qmt_thread_key;
178 /* helper function to extract qmt_thread_info from current environment */
180 struct qmt_thread_info *qmt_info(const struct lu_env *env)
182 struct qmt_thread_info *info;
184 info = lu_context_key_get(&env->le_ctx, &qmt_thread_key);
186 lu_env_refill((struct lu_env *)env);
187 info = lu_context_key_get(&env->le_ctx, &qmt_thread_key);
193 /* helper routine to convert a lu_device into a qmt_device */
194 static inline struct qmt_device *lu2qmt_dev(struct lu_device *ld)
196 return container_of0(lu2dt_dev(ld), struct qmt_device, qmt_dt_dev);
199 /* helper routine to convert a qmt_device into lu_device */
200 static inline struct lu_device *qmt2lu_dev(struct qmt_device *qmt)
202 return &qmt->qmt_dt_dev.dd_lu_dev;
205 #define LQE_ROOT(lqe) (lqe2qpi(lqe)->qpi_root)
206 #define LQE_GLB_OBJ(lqe) (lqe2qpi(lqe)->qpi_glb_obj[lqe->lqe_site->lqs_qtype])
208 static inline void qmt_restore(struct lquota_entry *lqe,
209 struct qmt_lqe_restore *restore)
211 lqe->lqe_hardlimit = restore->qlr_hardlimit;
212 lqe->lqe_softlimit = restore->qlr_softlimit;
213 lqe->lqe_gracetime = restore->qlr_gracetime;
214 lqe->lqe_granted = restore->qlr_granted;
215 lqe->lqe_qunit = restore->qlr_qunit;
219 void qmt_pool_fini(const struct lu_env *, struct qmt_device *);
220 int qmt_pool_init(const struct lu_env *, struct qmt_device *);
221 int qmt_pool_prepare(const struct lu_env *, struct qmt_device *,
223 int qmt_pool_new_conn(const struct lu_env *, struct qmt_device *,
224 struct lu_fid *, struct lu_fid *, __u64 *,
226 struct lquota_entry *qmt_pool_lqe_lookup(const struct lu_env *,
227 struct qmt_device *, int, int, int,
230 extern struct lquota_entry_operations qmt_lqe_ops;
231 struct thandle *qmt_trans_start_with_slv(const struct lu_env *,
232 struct lquota_entry *,
234 struct qmt_lqe_restore *);
235 struct thandle *qmt_trans_start(const struct lu_env *, struct lquota_entry *,
236 struct qmt_lqe_restore *);
237 int qmt_glb_write(const struct lu_env *, struct thandle *,
238 struct lquota_entry *, __u32, __u64 *);
239 int qmt_slv_write(const struct lu_env *, struct thandle *,
240 struct lquota_entry *, struct dt_object *, __u32, __u64 *,
242 int qmt_slv_read(const struct lu_env *, struct lquota_entry *,
243 struct dt_object *, __u64 *);
244 int qmt_validate_limits(struct lquota_entry *, __u64, __u64);
247 int qmt_intent_policy(const struct lu_env *, struct lu_device *,
248 struct ptlrpc_request *, struct ldlm_lock **, int);
249 int qmt_lvbo_init(struct lu_device *, struct ldlm_resource *);
250 int qmt_lvbo_update(struct lu_device *, struct ldlm_resource *,
251 struct ptlrpc_request *, int);
252 int qmt_lvbo_size(struct lu_device *, struct ldlm_lock *);
253 int qmt_lvbo_fill(struct lu_device *, struct ldlm_lock *, void *, int);
254 int qmt_lvbo_free(struct lu_device *, struct ldlm_resource *);
255 #endif /* _QMT_INTERNAL_H */