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40 * Internal interfaces of OSC layer.
42 * Author: Nikita Danilov <nikita.danilov@sun.com>
43 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
46 #ifndef OSC_CL_INTERNAL_H
47 #define OSC_CL_INTERNAL_H
49 #include <libcfs/libcfs.h>
51 /* osc_build_res_name() */
52 #include <cl_object.h>
53 #include "osc_internal.h"
62 * State maintained by osc layer for each IO context.
66 struct cl_io_slice oi_cl;
67 /** true if this io is lockless. */
69 /** how many LRU pages are reserved for this IO */
70 unsigned long oi_lru_reserved;
72 /** active extents, we know how many bytes is going to be written,
73 * so having an active extent will prevent it from being fragmented */
74 struct osc_extent *oi_active;
75 /** partially truncated extent, we need to hold this extent to prevent
76 * page writeback from happening. */
77 struct osc_extent *oi_trunc;
78 /** write osc_lock for this IO, used by osc_extent_find(). */
79 struct osc_lock *oi_write_osclock;
81 struct osc_async_cbargs {
84 struct completion opc_sync;
89 * State of transfer for osc.
92 struct cl_req_slice or_cl;
96 * State maintained by osc layer for the duration of a system call.
102 #define OTI_PVEC_SIZE 256
103 struct osc_thread_info {
104 struct ldlm_res_id oti_resname;
105 union ldlm_policy_data oti_policy;
106 struct cl_lock_descr oti_descr;
107 struct cl_attr oti_attr;
108 struct lustre_handle oti_handle;
109 struct cl_page_list oti_plist;
111 void *oti_pvec[OTI_PVEC_SIZE];
113 * Fields used by cl_lock_discard_pages().
115 pgoff_t oti_next_index;
116 pgoff_t oti_fn_index; /* first non-overlapped index */
117 struct cl_sync_io oti_anchor;
121 struct cl_object oo_cl;
122 struct lov_oinfo *oo_oinfo;
124 * True if locking against this stripe got -EUSERS.
127 cfs_time_t oo_contention_time;
128 #ifdef CONFIG_LUSTRE_DEBUG_EXPENSIVE_CHECK
130 * IO context used for invariant checks in osc_lock_has_pages().
132 struct cl_io oo_debug_io;
133 /** Serialization object for osc_object::oo_debug_io. */
134 struct mutex oo_debug_mutex;
137 * used by the osc to keep track of what objects to build into rpcs.
138 * Protected by client_obd->cli_loi_list_lock.
140 struct list_head oo_ready_item;
141 struct list_head oo_hp_ready_item;
142 struct list_head oo_write_item;
143 struct list_head oo_read_item;
146 * extent is a red black tree to manage (async) dirty pages.
148 struct rb_root oo_root;
150 * Manage write(dirty) extents.
152 struct list_head oo_hp_exts; /* list of hp extents */
153 struct list_head oo_urgent_exts; /* list of writeback extents */
154 struct list_head oo_rpc_exts;
156 struct list_head oo_reading_exts;
158 atomic_t oo_nr_reads;
159 atomic_t oo_nr_writes;
161 /** Protect extent tree. Will be used to protect
162 * oo_{read|write}_pages soon. */
166 * Radix tree for caching pages
168 struct radix_tree_root oo_tree;
169 spinlock_t oo_tree_lock;
170 unsigned long oo_npages;
172 /* Protect osc_lock this osc_object has */
173 spinlock_t oo_ol_spin;
174 struct list_head oo_ol_list;
177 static inline void osc_object_lock(struct osc_object *obj)
179 spin_lock(&obj->oo_lock);
182 static inline int osc_object_trylock(struct osc_object *obj)
184 return spin_trylock(&obj->oo_lock);
187 static inline void osc_object_unlock(struct osc_object *obj)
189 spin_unlock(&obj->oo_lock);
192 static inline int osc_object_is_locked(struct osc_object *obj)
194 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
195 return spin_is_locked(&obj->oo_lock);
198 * It is not perfect to return true all the time.
199 * But since this function is only used for assertion
200 * and checking, it seems OK.
207 * Lock "micro-states" for osc layer.
209 enum osc_lock_state {
218 * osc-private state of cl_lock.
220 * Interaction with DLM.
222 * Once receive upcall is invoked, osc_lock remembers a handle of DLM lock in
223 * osc_lock::ols_handle and a pointer to that lock in osc_lock::ols_dlmlock.
225 * This pointer is protected through a reference, acquired by
226 * osc_lock_upcall0(). Also, an additional reference is acquired by
227 * ldlm_lock_addref() call protecting the lock from cancellation, until
228 * osc_lock_unuse() releases it.
230 * Below is a description of how lock references are acquired and released
233 * - When new lock is created and enqueued to the server (ldlm_cli_enqueue())
234 * - ldlm_lock_create()
235 * - ldlm_lock_new(): initializes a lock with 2 references. One for
236 * the caller (released when reply from the server is received, or on
237 * error), and another for the hash table.
238 * - ldlm_lock_addref_internal(): protects the lock from cancellation.
240 * - When reply is received from the server (osc_enqueue_interpret())
241 * - ldlm_cli_enqueue_fini()
242 * - LDLM_LOCK_PUT(): releases caller reference acquired by
245 * ldlm_lock_decref(): error case: matches ldlm_cli_enqueue().
246 * - ldlm_lock_decref(): for async locks, matches ldlm_cli_enqueue().
248 * - When lock is being cancelled (ldlm_lock_cancel())
249 * - ldlm_lock_destroy()
250 * - LDLM_LOCK_PUT(): releases hash-table reference acquired by
253 * osc_lock is detached from ldlm_lock by osc_lock_detach() that is called
254 * either when lock is cancelled (osc_lock_blocking()), or when locks is
255 * deleted without cancellation (e.g., from cl_locks_prune()). In the latter
256 * case ldlm lock remains in memory, and can be re-attached to osc_lock in the
260 struct cl_lock_slice ols_cl;
261 /** Internal lock to protect states, etc. */
263 /** Owner sleeps on this channel for state change */
264 struct cl_sync_io *ols_owner;
265 /** waiting list for this lock to be cancelled */
266 struct list_head ols_waiting_list;
267 /** wait entry of ols_waiting_list */
268 struct list_head ols_wait_entry;
269 /** list entry for osc_object::oo_ol_list */
270 struct list_head ols_nextlock_oscobj;
272 /** underlying DLM lock */
273 struct ldlm_lock *ols_dlmlock;
274 /** DLM flags with which osc_lock::ols_lock was enqueued */
276 /** osc_lock::ols_lock handle */
277 struct lustre_handle ols_handle;
278 struct ldlm_enqueue_info ols_einfo;
279 enum osc_lock_state ols_state;
280 /** lock value block */
281 struct ost_lvb ols_lvb;
284 * true, if ldlm_lock_addref() was called against
285 * osc_lock::ols_lock. This is used for sanity checking.
287 * \see osc_lock::ols_has_ref
289 unsigned ols_hold :1,
291 * this is much like osc_lock::ols_hold, except that this bit is
292 * cleared _after_ reference in released in osc_lock_unuse(). This
293 * fine distinction is needed because:
295 * - if ldlm lock still has a reference, osc_ast_data_get() needs
296 * to return associated cl_lock (so that a flag is needed that is
297 * cleared after ldlm_lock_decref() returned), and
299 * - ldlm_lock_decref() can invoke blocking ast (for a
300 * LDLM_FL_CBPENDING lock), and osc_lock functions like
301 * osc_lock_cancel() called from there need to know whether to
302 * release lock reference (so that a flag is needed that is
303 * cleared before ldlm_lock_decref() is called).
307 * inherit the lockless attribute from top level cl_io.
308 * If true, osc_lock_enqueue is able to tolerate the -EUSERS error.
312 * if set, the osc_lock is a glimpse lock. For glimpse locks, we treat
313 * the EVAVAIL error as torerable, this will make upper logic happy
314 * to wait all glimpse locks to each OSTs to be completed.
315 * Glimpse lock converts to normal lock if the server lock is
317 * Glimpse lock should be destroyed immediately after use.
321 * For async glimpse lock.
328 * Page state private for osc layer.
331 struct cl_page_slice ops_cl;
333 * Page queues used by osc to detect when RPC can be formed.
335 struct osc_async_page ops_oap;
337 * An offset within page from which next transfer starts. This is used
338 * by cl_page_clip() to submit partial page transfers.
342 * An offset within page at which next transfer ends.
344 * \see osc_page::ops_from.
348 * Boolean, true iff page is under transfer. Used for sanity checking.
350 unsigned ops_transfer_pinned:1,
352 * True for a `temporary page' created by read-ahead code, probably
353 * outside of any DLM lock.
361 * Set if the page must be transferred with OBD_BRW_SRVLOCK.
365 * lru page list. See osc_lru_{del|use}() in osc_page.c for usage.
367 struct list_head ops_lru;
369 * Submit time - the time when the page is starting RPC. For debugging.
371 cfs_time_t ops_submit_time;
374 extern struct kmem_cache *osc_lock_kmem;
375 extern struct kmem_cache *osc_object_kmem;
376 extern struct kmem_cache *osc_thread_kmem;
377 extern struct kmem_cache *osc_session_kmem;
378 extern struct kmem_cache *osc_req_kmem;
379 extern struct kmem_cache *osc_extent_kmem;
381 extern struct lu_device_type osc_device_type;
382 extern struct lu_context_key osc_key;
383 extern struct lu_context_key osc_session_key;
385 #define OSC_FLAGS (ASYNC_URGENT|ASYNC_READY)
387 int osc_lock_init(const struct lu_env *env,
388 struct cl_object *obj, struct cl_lock *lock,
389 const struct cl_io *io);
390 int osc_io_init (const struct lu_env *env,
391 struct cl_object *obj, struct cl_io *io);
392 int osc_req_init (const struct lu_env *env, struct cl_device *dev,
394 struct lu_object *osc_object_alloc(const struct lu_env *env,
395 const struct lu_object_header *hdr,
396 struct lu_device *dev);
397 int osc_page_init(const struct lu_env *env, struct cl_object *obj,
398 struct cl_page *page, pgoff_t ind);
400 void osc_index2policy(union ldlm_policy_data *policy,
401 const struct cl_object *obj, pgoff_t start, pgoff_t end);
402 int osc_lvb_print(const struct lu_env *env, void *cookie,
403 lu_printer_t p, const struct ost_lvb *lvb);
405 void osc_lru_add_batch(struct client_obd *cli, struct list_head *list);
406 void osc_page_submit(const struct lu_env *env, struct osc_page *opg,
407 enum cl_req_type crt, int brw_flags);
408 int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops);
409 int osc_set_async_flags(struct osc_object *obj, struct osc_page *opg,
411 int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
412 struct page *page, loff_t offset);
413 int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
414 struct osc_page *ops);
415 int osc_page_cache_add(const struct lu_env *env,
416 const struct cl_page_slice *slice, struct cl_io *io);
417 int osc_teardown_async_page(const struct lu_env *env, struct osc_object *obj,
418 struct osc_page *ops);
419 int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
420 struct osc_page *ops);
421 int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
422 struct list_head *list, int cmd, int brw_flags);
423 int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
424 struct osc_object *obj, __u64 size);
425 void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
426 struct osc_object *obj);
427 int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
428 pgoff_t start, pgoff_t end, int hp, int discard);
429 int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
430 pgoff_t start, pgoff_t end);
431 void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
432 struct osc_object *osc);
433 int lru_queue_work(const struct lu_env *env, void *data);
435 void osc_object_set_contended (struct osc_object *obj);
436 void osc_object_clear_contended(struct osc_object *obj);
437 int osc_object_is_contended (struct osc_object *obj);
439 int osc_lock_is_lockless (const struct osc_lock *olck);
441 /*****************************************************************************
447 static inline struct osc_thread_info *osc_env_info(const struct lu_env *env)
449 struct osc_thread_info *info;
451 info = lu_context_key_get(&env->le_ctx, &osc_key);
452 LASSERT(info != NULL);
456 static inline struct osc_session *osc_env_session(const struct lu_env *env)
458 struct osc_session *ses;
460 ses = lu_context_key_get(env->le_ses, &osc_session_key);
461 LASSERT(ses != NULL);
465 static inline struct osc_io *osc_env_io(const struct lu_env *env)
467 return &osc_env_session(env)->os_io;
470 static inline int osc_is_object(const struct lu_object *obj)
472 return obj->lo_dev->ld_type == &osc_device_type;
475 static inline struct osc_device *lu2osc_dev(const struct lu_device *d)
477 LINVRNT(d->ld_type == &osc_device_type);
478 return container_of0(d, struct osc_device, od_cl.cd_lu_dev);
481 static inline struct obd_export *osc_export(const struct osc_object *obj)
483 return lu2osc_dev(obj->oo_cl.co_lu.lo_dev)->od_exp;
486 static inline struct client_obd *osc_cli(const struct osc_object *obj)
488 return &osc_export(obj)->exp_obd->u.cli;
491 static inline struct osc_object *cl2osc(const struct cl_object *obj)
493 LINVRNT(osc_is_object(&obj->co_lu));
494 return container_of0(obj, struct osc_object, oo_cl);
497 static inline struct cl_object *osc2cl(const struct osc_object *obj)
499 return (struct cl_object *)&obj->oo_cl;
502 static inline enum ldlm_mode osc_cl_lock2ldlm(enum cl_lock_mode mode)
504 LASSERT(mode == CLM_READ || mode == CLM_WRITE || mode == CLM_GROUP);
505 if (mode == CLM_READ)
507 if (mode == CLM_WRITE)
512 static inline enum cl_lock_mode osc_ldlm2cl_lock(enum ldlm_mode mode)
514 LASSERT(mode == LCK_PR || mode == LCK_PW || mode == LCK_GROUP);
522 static inline struct osc_page *cl2osc_page(const struct cl_page_slice *slice)
524 LINVRNT(osc_is_object(&slice->cpl_obj->co_lu));
525 return container_of0(slice, struct osc_page, ops_cl);
528 static inline struct osc_page *oap2osc(struct osc_async_page *oap)
530 return container_of0(oap, struct osc_page, ops_oap);
533 static inline pgoff_t osc_index(struct osc_page *opg)
535 return opg->ops_cl.cpl_index;
538 static inline struct cl_page *oap2cl_page(struct osc_async_page *oap)
540 return oap2osc(oap)->ops_cl.cpl_page;
543 static inline struct osc_page *oap2osc_page(struct osc_async_page *oap)
545 return (struct osc_page *)container_of(oap, struct osc_page, ops_oap);
548 static inline struct osc_lock *cl2osc_lock(const struct cl_lock_slice *slice)
550 LINVRNT(osc_is_object(&slice->cls_obj->co_lu));
551 return container_of0(slice, struct osc_lock, ols_cl);
554 static inline struct osc_lock *osc_lock_at(const struct cl_lock *lock)
556 return cl2osc_lock(cl_lock_at(lock, &osc_device_type));
559 static inline int osc_io_srvlock(struct osc_io *oio)
561 return (oio->oi_lockless && !oio->oi_cl.cis_io->ci_no_srvlock);
564 enum osc_extent_state {
565 OES_INV = 0, /** extent is just initialized or destroyed */
566 OES_ACTIVE = 1, /** process is using this extent */
567 OES_CACHE = 2, /** extent is ready for IO */
568 OES_LOCKING = 3, /** locking page to prepare IO */
569 OES_LOCK_DONE = 4, /** locking finished, ready to send */
570 OES_RPC = 5, /** in RPC */
571 OES_TRUNC = 6, /** being truncated */
576 * osc_extent data to manage dirty pages.
577 * osc_extent has the following attributes:
578 * 1. all pages in the same must be in one RPC in write back;
579 * 2. # of pages must be less than max_pages_per_rpc - implied by 1;
580 * 3. must be covered by only 1 osc_lock;
581 * 4. exclusive. It's impossible to have overlapped osc_extent.
583 * The lifetime of an extent is from when the 1st page is dirtied to when
584 * all pages inside it are written out.
588 * page lock -> client_obd_list_lock -> object lock(osc_object::oo_lock)
591 /** red-black tree node */
592 struct rb_node oe_node;
593 /** osc_object of this extent */
594 struct osc_object *oe_obj;
595 /** refcount, removed from red-black tree if reaches zero. */
597 /** busy if non-zero */
599 /** link list of osc_object's oo_{hp|urgent|locking}_exts. */
600 struct list_head oe_link;
601 /** state of this extent */
602 enum osc_extent_state oe_state;
603 /** flags for this extent. */
604 unsigned int oe_intree:1,
605 /** 0 is write, 1 is read */
607 /** sync extent, queued by osc_queue_sync_pages() */
611 /** an ACTIVE extent is going to be truncated, so when this extent
612 * is released, it will turn into TRUNC state instead of CACHE. */
614 /** this extent should be written asap and someone may wait for the
615 * write to finish. This bit is usually set along with urgent if
616 * the extent was CACHE state.
617 * fsync_wait extent can't be merged because new extent region may
618 * exceed fsync range. */
620 /** covering lock is being canceled */
622 /** this extent should be written back asap. set if one of pages is
623 * called by page WB daemon, or sync write or reading requests. */
625 /** how many grants allocated for this extent.
626 * Grant allocated for this extent. There is no grant allocated
627 * for reading extents and sync write extents. */
628 unsigned int oe_grants;
629 /** # of dirty pages in this extent */
630 unsigned int oe_nr_pages;
631 /** list of pending oap pages. Pages in this list are NOT sorted. */
632 struct list_head oe_pages;
633 /** Since an extent has to be written out in atomic, this is used to
634 * remember the next page need to be locked to write this extent out.
635 * Not used right now.
637 struct osc_page *oe_next_page;
638 /** start and end index of this extent, include start and end
639 * themselves. Page offset here is the page index of osc_pages.
640 * oe_start is used as keyword for red-black tree. */
643 /** maximum ending index of this extent, this is limited by
644 * max_pages_per_rpc, lock extent and chunk size. */
646 /** waitqueue - for those who want to be notified if this extent's
647 * state has changed. */
648 wait_queue_head_t oe_waitq;
649 /** lock covering this extent */
650 struct ldlm_lock *oe_dlmlock;
651 /** terminator of this extent. Must be true if this extent is in IO. */
652 struct task_struct *oe_owner;
653 /** return value of writeback. If somebody is waiting for this extent,
654 * this value can be known by outside world. */
656 /** max pages per rpc when this extent was created */
657 unsigned int oe_mppr;
660 int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
662 int osc_extent_release(const struct lu_env *env, struct osc_extent *ext);
664 int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
665 pgoff_t start, pgoff_t end, enum cl_lock_mode mode);
667 typedef int (*osc_page_gang_cbt)(const struct lu_env *, struct cl_io *,
668 struct osc_page *, void *);
669 int osc_page_gang_lookup(const struct lu_env *env, struct cl_io *io,
670 struct osc_object *osc, pgoff_t start, pgoff_t end,
671 osc_page_gang_cbt cb, void *cbdata);
674 #endif /* OSC_CL_INTERNAL_H */