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29 * This file is part of Lustre, http://www.lustre.org/
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33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Internal interfaces of LOV layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@intel.com>
42 #ifndef LOV_CL_INTERNAL_H
43 #define LOV_CL_INTERNAL_H
45 #include <libcfs/libcfs.h>
47 #include <cl_object.h>
48 #include "lov_internal.h"
51 * Logical object volume layer. This layer implements data striping (raid0).
53 * At the lov layer top-entity (object, page, lock, io) is connected to one or
54 * more sub-entities: top-object, representing a file is connected to a set of
55 * sub-objects, each representing a stripe, file-level top-lock is connected
56 * to a set of per-stripe sub-locks, top-page is connected to a (single)
57 * sub-page, and a top-level IO is connected to a set of (potentially
58 * concurrent) sub-IO's.
60 * Sub-object, sub-page, and sub-io have well-defined top-object and top-page
61 * respectively, while a single sub-lock can be part of multiple top-locks.
63 * Reference counting models are different for different types of entities:
65 * - top-object keeps a reference to its sub-objects, and destroys them
66 * when it is destroyed.
68 * - top-page keeps a reference to its sub-page, and destroys it when it
71 * - IO's are not reference counted.
73 * To implement a connection between top and sub entities, lov layer is split
74 * into two pieces: lov ("upper half"), and lovsub ("bottom half"), both
75 * implementing full set of cl-interfaces. For example, top-object has vvp and
76 * lov layers, and it's sub-object has lovsub and osc layers. lovsub layer is
77 * used to track child-parent relationship.
85 enum lov_device_flags {
86 LOV_DEV_INITIALIZED = BIT(0),
93 /* Data-on-MDT array item in lov_device::ld_md_tgts[] */
94 struct lovdom_device {
95 struct cl_device *ldm_mdc;
101 * XXX Locking of lov-private data is missing.
103 struct cl_device ld_cl;
104 struct lov_obd *ld_lov;
105 /** size of lov_device::ld_target[] array */
107 struct lovsub_device **ld_target;
110 /* Data-on-MDT devices */
112 struct lovdom_device *ld_md_tgts;
113 struct obd_device *ld_lmv;
114 /* LU site for subdevices */
115 struct lu_site ld_site;
121 enum lov_layout_type {
122 LLT_EMPTY, /** empty file without body (mknod + truncate) */
123 LLT_RELEASED, /** file with no objects (data in HSM) */
124 LLT_COMP, /** support composite layout */
125 LLT_FOREIGN, /** foreign layout */
129 static inline char *llt2str(enum lov_layout_type llt)
148 * Return lov_layout_entry_type associated with a given composite layout
151 static inline __u32 lov_entry_type(struct lov_stripe_md_entry *lsme)
153 if ((lov_pattern(lsme->lsme_pattern) & LOV_PATTERN_RAID0) ||
154 (lov_pattern(lsme->lsme_pattern) == LOV_PATTERN_MDT) ||
155 (lov_pattern(lsme->lsme_pattern) == LOV_PATTERN_FOREIGN))
156 return lov_pattern(lsme->lsme_pattern &
157 ~LOV_PATTERN_OVERSTRIPING);
161 struct lov_layout_entry;
165 struct lov_comp_layout_entry_ops {
166 int (*lco_init)(const struct lu_env *env, struct lov_device *dev,
167 struct lov_object *lov, unsigned int index,
168 const struct cl_object_conf *conf,
169 struct lov_layout_entry *lle);
170 void (*lco_fini)(const struct lu_env *env,
171 struct lov_layout_entry *lle);
172 int (*lco_getattr)(const struct lu_env *env, struct lov_object *obj,
173 unsigned int index, struct lov_layout_entry *lle,
174 struct cl_attr **attr);
177 struct lov_layout_raid0 {
180 * record the stripe no before the truncate size, used for setting OST
181 * object size for truncate. LU-14128.
183 int lo_trunc_stripeno;
185 * When this is true, lov_object::lo_attr contains
186 * valid up to date attributes for a top-level
187 * object. This field is reset to 0 when attributes of
188 * any sub-object change.
192 * Array of sub-objects. Allocated when top-object is
193 * created (lov_init_raid0()).
195 * Top-object is a strict master of its sub-objects:
196 * it is created before them, and outlives its
197 * children (this later is necessary so that basic
198 * functions like cl_object_top() always
199 * work). Top-object keeps a reference on every
202 * When top-object is destroyed (lov_delete_raid0())
203 * it releases its reference to a sub-object and waits
204 * until the latter is finally destroyed.
206 struct lovsub_object **lo_sub;
210 spinlock_t lo_sub_lock;
212 * Cached object attribute, built from sub-object
215 struct cl_attr lo_attr;
218 struct lov_layout_dom {
219 /* keep this always at first place so DOM layout entry
220 * can be addressed also as RAID0 after initialization.
222 struct lov_layout_raid0 lo_dom_r0;
223 struct lovsub_object *lo_dom;
224 struct lov_oinfo *lo_loi;
227 struct lov_layout_entry {
229 unsigned int lle_valid:1;
230 struct lu_extent *lle_extent;
231 struct lov_stripe_md_entry *lle_lsme;
232 struct lov_comp_layout_entry_ops *lle_comp_ops;
234 struct lov_layout_raid0 lle_raid0;
235 struct lov_layout_dom lle_dom;
239 struct lov_mirror_entry {
240 unsigned short lre_mirror_id;
241 unsigned short lre_preferred:1,
242 lre_stale:1, /* set if any components is stale */
243 lre_valid:1, /* set if at least one of components
244 * in this mirror is valid */
245 lre_foreign:1; /* set if it is a foreign component */
247 unsigned short lre_start; /* index to lo_entries, start index of
249 unsigned short lre_end; /* end index of this mirror */
253 * lov-specific file state.
255 * lov object has particular layout type, determining how top-object is built
256 * on top of sub-objects. Layout type can change dynamically. When this
257 * happens, lov_object::lo_type_guard semaphore is taken in exclusive mode,
258 * all state pertaining to the old layout type is destroyed, and new state is
259 * constructed. All object methods take said semaphore in the shared mode,
260 * providing serialization against transition between layout types.
262 * To avoid multiple `if' or `switch' statements, selecting behavior for the
263 * current layout type, object methods perform double-dispatch, invoking
264 * function corresponding to the current layout type.
267 struct cl_object lo_cl;
269 * Serializes object operations with transitions between layout types.
271 * This semaphore is taken in shared mode by all object methods, and
272 * is taken in exclusive mode when object type is changed.
274 * \see lov_object::lo_type
276 struct rw_semaphore lo_type_guard;
278 * Type of an object. Protected by lov_object::lo_type_guard.
280 enum lov_layout_type lo_type;
282 * True if layout is invalid. This bit is cleared when layout lock
285 bool lo_layout_invalid;
287 * How many IOs are on going on this object. Layout can be changed
288 * only if there is no active IO.
290 atomic_t lo_active_ios;
292 * Waitq - wait for no one else is using lo_lsm
294 wait_queue_head_t lo_waitq;
296 * Layout metadata. NULL if empty layout.
298 struct lov_stripe_md *lo_lsm;
300 union lov_layout_state {
301 struct lov_layout_state_empty {
303 struct lov_layout_state_released {
305 struct lov_layout_composite {
307 * flags of lov_comp_md_v1::lcm_flags. Mainly used
312 * For FLR: index of preferred mirror to read.
313 * Preferred mirror is initialized by the preferred
314 * bit of lsme. It can be changed when the preferred
316 * In order to make lov_lsm_entry() return the same
317 * mirror in the same IO context, it's only possible
318 * to change the preferred mirror when the
319 * lo_active_ios reaches zero.
321 int lo_preferred_mirror;
323 * For FLR: the lock to protect access to
324 * lo_preferred_mirror.
326 spinlock_t lo_write_lock;
328 * For FLR: Number of (valid) mirrors.
330 unsigned lo_mirror_count;
331 struct lov_mirror_entry *lo_mirrors;
333 * Current entry count of lo_entries, include
336 unsigned int lo_entry_count;
337 struct lov_layout_entry *lo_entries;
341 * Thread that acquired lov_object::lo_type_guard in an exclusive
344 struct task_struct *lo_owner;
347 static inline struct lov_layout_raid0 *lov_r0(struct lov_object *lov, int i)
349 LASSERT(lov->lo_type == LLT_COMP);
350 LASSERTF(i < lov->u.composite.lo_entry_count,
351 "entry %d entry_count %d\n", i,
352 lov->u.composite.lo_entry_count);
354 return &lov->u.composite.lo_entries[i].lle_raid0;
357 static inline struct lov_stripe_md_entry *lov_lse(struct lov_object *lov, int i)
359 LASSERT(lov->lo_lsm != NULL);
360 LASSERT(i < lov->lo_lsm->lsm_entry_count);
362 return lov->lo_lsm->lsm_entries[i];
365 static inline unsigned lov_flr_state(const struct lov_object *lov)
367 if (lov->lo_type != LLT_COMP)
370 return lov->u.composite.lo_flags & LCM_FL_FLR_MASK;
373 static inline bool lov_is_flr(const struct lov_object *lov)
375 return lov_flr_state(lov) != LCM_FL_NONE;
378 static inline struct lov_layout_entry *lov_entry(struct lov_object *lov, int i)
380 LASSERT(lov->lo_type == LLT_COMP);
381 LASSERTF(i < lov->u.composite.lo_entry_count,
382 "entry %d entry_count %d\n", i,
383 lov->u.composite.lo_entry_count);
385 return &lov->u.composite.lo_entries[i];
388 #define lov_for_layout_entry(lov, entry, start, end) \
389 for (entry = lov_entry(lov, start); \
390 entry <= lov_entry(lov, end); entry++)
392 #define lov_foreach_layout_entry(lov, entry) \
393 lov_for_layout_entry(lov, entry, 0, \
394 (lov)->u.composite.lo_entry_count - 1)
396 #define lov_foreach_mirror_layout_entry(lov, entry, lre) \
397 lov_for_layout_entry(lov, entry, (lre)->lre_start, (lre)->lre_end)
399 static inline struct lov_mirror_entry *
400 lov_mirror_entry(struct lov_object *lov, int i)
402 LASSERT(i < lov->u.composite.lo_mirror_count);
403 return &lov->u.composite.lo_mirrors[i];
406 #define lov_foreach_mirror_entry(lov, lre) \
407 for (lre = lov_mirror_entry(lov, 0); \
408 lre <= lov_mirror_entry(lov, \
409 lov->u.composite.lo_mirror_count - 1); \
412 static inline unsigned
413 lov_layout_entry_index(struct lov_object *lov, struct lov_layout_entry *entry)
415 struct lov_layout_entry *first = &lov->u.composite.lo_entries[0];
416 unsigned index = (unsigned)(entry - first);
418 LASSERT(entry >= first);
419 LASSERT(index < lov->u.composite.lo_entry_count);
425 * State lov_lock keeps for each sub-lock.
427 struct lov_lock_sub {
428 /** sub-lock itself */
429 struct cl_lock sub_lock;
430 /** Set if the sublock has ever been enqueued, meaning it may
431 * hold resources of underlying layers */
432 unsigned int sub_is_enqueued:1,
438 * lov-specific lock state.
441 struct cl_lock_slice lls_cl;
442 /** Number of sub-locks in this lock */
445 struct lov_lock_sub lls_sub[0];
449 struct cl_page_slice lps_cl;
450 /* the layout gen when this page was created */
451 __u32 lps_layout_gen;
458 struct lovsub_device {
459 struct cl_device acid_cl;
460 struct cl_device *acid_next;
463 struct lovsub_object {
464 struct cl_object_header lso_header;
465 struct cl_object lso_cl;
466 struct lov_object *lso_super;
471 * Describe the environment settings for sublocks.
473 struct lov_sublock_env {
474 const struct lu_env *lse_env;
475 struct cl_io *lse_io;
478 struct lov_thread_info {
479 struct cl_object_conf lti_stripe_conf;
480 struct lu_fid lti_fid;
481 struct ost_lvb lti_lvb;
482 struct cl_2queue lti_cl2q;
483 struct cl_page_list lti_plist;
487 * State that lov_io maintains for every sub-io.
491 * Linkage into a list (hanging off lov_io::lis_subios)
493 struct list_head sub_list;
495 * Linkage into a list (hanging off lov_io::lis_active) of all
496 * sub-io's active for the current IO iteration.
498 struct list_head sub_linkage;
499 unsigned int sub_subio_index;
501 * sub-io for a stripe. Ideally sub-io's can be stopped and resumed
502 * independently, with lov acting as a scheduler to maximize overall
507 * environment, in which sub-io executes.
509 struct lu_env *sub_env;
511 * environment's refcheck.
519 * IO state private for LOV.
523 struct cl_io_slice lis_cl;
526 * FLR: index to lo_mirrors. Valid only if lov_is_flr() returns true.
528 * The mirror index of this io. Preserved over cl_io_init()
529 * if io->ci_ndelay_tried is greater than zero.
531 int lis_mirror_index;
533 * FLR: the layout gen when lis_mirror_index was cached. The
534 * mirror index makes sense only when the layout gen doesn't
537 int lis_mirror_layout_gen;
540 * fields below this will be initialized in lov_io_init().
542 unsigned lis_preserved;
545 * Pointer to the object slice. This is a duplicate of
546 * lov_io::lis_cl::cis_object.
548 struct lov_object *lis_object;
550 * Original end-of-io position for this IO, set by the upper layer as
551 * cl_io::u::ci_rw::pos + cl_io::u::ci_rw::count. lov remembers this,
552 * changes pos and count to fit IO into a single stripe and uses saved
553 * value to determine when IO iterations have to stop.
555 * This is used only for CIT_READ and CIT_WRITE io's.
557 loff_t lis_io_endpos;
560 * starting position within a file, for the current io loop iteration
561 * (stripe), used by ci_io_loop().
565 * end position with in a file, for the current stripe io. This is
566 * exclusive (i.e., next offset after last byte affected by io).
572 * the index of ls_single_subio in ls_subios array
574 int lis_single_subio_index;
575 struct lov_io_sub lis_single_subio;
578 * List of active sub-io's. Active sub-io's are under the range
579 * of [lis_pos, lis_endpos).
581 struct list_head lis_active;
583 * All sub-io's created in this lov_io.
585 struct list_head lis_subios;
591 struct lov_sublock_env ls_subenv;
594 extern struct lu_device_type lov_device_type;
595 extern struct lu_device_type lovsub_device_type;
597 extern struct lu_context_key lov_key;
598 extern struct lu_context_key lov_session_key;
600 extern struct kmem_cache *lov_lock_kmem;
601 extern struct kmem_cache *lov_object_kmem;
602 extern struct kmem_cache *lov_thread_kmem;
603 extern struct kmem_cache *lov_session_kmem;
605 extern struct kmem_cache *lovsub_object_kmem;
607 int lov_lock_init_composite(const struct lu_env *env, struct cl_object *obj,
608 struct cl_lock *lock, const struct cl_io *io);
609 int lov_lock_init_empty (const struct lu_env *env, struct cl_object *obj,
610 struct cl_lock *lock, const struct cl_io *io);
611 int lov_io_init_composite(const struct lu_env *env, struct cl_object *obj,
613 int lov_io_init_empty (const struct lu_env *env, struct cl_object *obj,
615 int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
618 struct lov_io_sub *lov_sub_get(const struct lu_env *env, struct lov_io *lio,
621 int lov_page_init_empty (const struct lu_env *env, struct cl_object *obj,
622 struct cl_page *page, pgoff_t index);
623 int lov_page_init_composite(const struct lu_env *env, struct cl_object *obj,
624 struct cl_page *page, pgoff_t index);
625 int lov_page_init_foreign(const struct lu_env *env, struct cl_object *obj,
626 struct cl_page *page, pgoff_t index);
627 struct lu_object *lov_object_alloc (const struct lu_env *env,
628 const struct lu_object_header *hdr,
629 struct lu_device *dev);
631 struct lu_object *lovsub_object_alloc(const struct lu_env *env,
632 const struct lu_object_header *hdr,
633 struct lu_device *dev);
635 int lov_page_stripe(const struct cl_page *page);
636 bool lov_page_is_empty(const struct cl_page *page);
637 int lov_lsm_entry(const struct lov_stripe_md *lsm, __u64 offset);
638 int lov_io_layout_at(struct lov_io *lio, __u64 offset);
640 #define lov_foreach_target(lov, var) \
641 for (var = 0; var < lov_targets_nr(lov); ++var)
643 static inline struct lu_extent *lov_io_extent(struct lov_io *io, int i)
645 return &lov_lse(io->lis_object, i)->lsme_extent;
649 * For layout entries within @ext.
651 #define lov_foreach_io_layout(ind, lio, ext) \
652 for (ind = lov_io_layout_at(lio, (ext)->e_start); \
654 lu_extent_is_overlapped(lov_io_extent(lio, ind), ext); \
655 ind = lov_io_layout_at(lio, lov_io_extent(lio, ind)->e_end))
657 /*****************************************************************************
665 static inline struct lov_session *lov_env_session(const struct lu_env *env)
667 struct lov_session *ses;
669 ses = lu_context_key_get(env->le_ses, &lov_session_key);
670 LASSERT(ses != NULL);
674 static inline struct lov_io *lov_env_io(const struct lu_env *env)
676 return &lov_env_session(env)->ls_io;
679 static inline int lov_is_object(const struct lu_object *obj)
681 return obj->lo_dev->ld_type == &lov_device_type;
684 static inline int lovsub_is_object(const struct lu_object *obj)
686 return obj->lo_dev->ld_type == &lovsub_device_type;
689 static inline struct lu_device *lov2lu_dev(struct lov_device *lov)
691 return &lov->ld_cl.cd_lu_dev;
694 static inline struct lov_device *lu2lov_dev(const struct lu_device *d)
696 LINVRNT(d->ld_type == &lov_device_type);
697 return container_of(d, struct lov_device, ld_cl.cd_lu_dev);
700 static inline struct cl_device *lovsub2cl_dev(struct lovsub_device *lovsub)
702 return &lovsub->acid_cl;
705 static inline struct lu_device *lovsub2lu_dev(struct lovsub_device *lovsub)
707 return &lovsub2cl_dev(lovsub)->cd_lu_dev;
710 static inline struct lovsub_device *lu2lovsub_dev(const struct lu_device *d)
712 LINVRNT(d->ld_type == &lovsub_device_type);
713 return container_of(d, struct lovsub_device, acid_cl.cd_lu_dev);
716 static inline struct lovsub_device *cl2lovsub_dev(const struct cl_device *d)
718 LINVRNT(d->cd_lu_dev.ld_type == &lovsub_device_type);
719 return container_of(d, struct lovsub_device, acid_cl);
722 static inline struct lu_object *lov2lu(struct lov_object *lov)
724 return &lov->lo_cl.co_lu;
727 static inline struct cl_object *lov2cl(struct lov_object *lov)
732 static inline struct lov_object *lu2lov(const struct lu_object *obj)
734 LINVRNT(lov_is_object(obj));
735 return container_of(obj, struct lov_object, lo_cl.co_lu);
738 static inline struct lov_object *cl2lov(const struct cl_object *obj)
740 LINVRNT(lov_is_object(&obj->co_lu));
741 return container_of(obj, struct lov_object, lo_cl);
744 static inline struct lu_object *lovsub2lu(struct lovsub_object *los)
746 return &los->lso_cl.co_lu;
749 static inline struct cl_object *lovsub2cl(struct lovsub_object *los)
754 static inline struct lovsub_object *cl2lovsub(const struct cl_object *obj)
756 LINVRNT(lovsub_is_object(&obj->co_lu));
757 return container_of(obj, struct lovsub_object, lso_cl);
760 static inline struct lovsub_object *lu2lovsub(const struct lu_object *obj)
762 LINVRNT(lovsub_is_object(obj));
763 return container_of(obj, struct lovsub_object, lso_cl.co_lu);
766 static inline struct lov_lock *cl2lov_lock(const struct cl_lock_slice *slice)
768 LINVRNT(lov_is_object(&slice->cls_obj->co_lu));
769 return container_of(slice, struct lov_lock, lls_cl);
772 static inline struct lov_page *cl2lov_page(const struct cl_page_slice *slice)
774 LINVRNT(lov_is_object(&slice->cpl_obj->co_lu));
775 return container_of(slice, struct lov_page, lps_cl);
778 static inline struct lov_io *cl2lov_io(const struct lu_env *env,
779 const struct cl_io_slice *ios)
783 lio = container_of(ios, struct lov_io, lis_cl);
784 LASSERT(lio == lov_env_io(env));
788 static inline int lov_targets_nr(const struct lov_device *lov)
790 return lov->ld_lov->desc.ld_tgt_count;
793 static inline struct lov_thread_info *lov_env_info(const struct lu_env *env)
795 struct lov_thread_info *info;
797 info = lu_context_key_get(&env->le_ctx, &lov_key);
798 LASSERT(info != NULL);
803 int lov_getstripe(const struct lu_env *env, struct lov_object *obj,
804 struct lov_stripe_md *lsm, struct lov_user_md __user *lump,