1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2006 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #ifndef __LUSTRE_LU_OBJECT_H
24 #define __LUSTRE_LU_OBJECT_H
31 #include <lustre/lustre_idl.h>
33 #include <libcfs/list.h>
34 #include <libcfs/kp30.h>
37 * Layered objects support for CMD3/C5.
41 struct proc_dir_entry;
46 * lu_* data-types represent server-side entities shared by data and meta-data
51 * 0. support for layering.
53 * Server side object is split into layers, one per device in the
54 * corresponding device stack. Individual layer is represented by struct
55 * lu_object. Compound layered object --- by struct lu_object_header. Most
56 * interface functions take lu_object as an argument and operate on the
57 * whole compound object. This decision was made due to the following
60 * - it's envisaged that lu_object will be used much more often than
63 * - we want lower (non-top) layers to be able to initiate operations
64 * on the whole object.
66 * Generic code supports layering more complex than simple stacking, e.g.,
67 * it is possible that at some layer object "spawns" multiple sub-objects
70 * 1. fid-based identification.
72 * Compound object is uniquely identified by its fid. Objects are indexed
73 * by their fids (hash table is used for index).
75 * 2. caching and life-cycle management.
77 * Object's life-time is controlled by reference counting. When reference
78 * count drops to 0, object is returned to cache. Cached objects still
79 * retain their identity (i.e., fid), and can be recovered from cache.
81 * Objects are kept in the global LRU list, and lu_site_purge() function
82 * can be used to reclaim given number of unused objects from the tail of
85 * 3. avoiding recursion.
87 * Generic code tries to replace recursion through layers by iterations
88 * where possible. Additionally to the end of reducing stack consumption,
89 * data, when practically possible, are allocated through lu_context_key
90 * interface rather than on stack.
97 struct lu_object_header;
102 * Operations common for data and meta-data devices.
104 struct lu_device_operations {
106 * Object creation protocol.
108 * Due to design goal of avoiding recursion, object creation (see
109 * lu_object_alloc()) is somewhat involved:
111 * - first, ->ldo_object_alloc() method of the top-level device
112 * in the stack is called. It should allocate top level object
113 * (including lu_object_header), but without any lower-layer
116 * - then lu_object_alloc() sets fid in the header of newly created
119 * - then ->loo_object_init() (a method from struct
120 * lu_object_operations) is called. It has to allocate lower-layer
121 * object(s). To do this, ->loo_object_init() calls
122 * ldo_object_alloc() of the lower-layer device(s).
124 * - for all new objects allocated by ->loo_object_init() (and
125 * inserted into object stack), ->loo_object_init() is called again
126 * repeatedly, until no new objects are created.
131 * Allocate object for the given device (without lower-layer
132 * parts). This is called by ->loo_object_init() from the parent
133 * layer, and should setup at least ->lo_dev and ->lo_ops fields of
134 * resulting lu_object.
136 * postcondition: ergo(!IS_ERR(result), result->lo_dev == d &&
137 * result->lo_ops != NULL);
139 struct lu_object *(*ldo_object_alloc)(const struct lu_env *env,
140 const struct lu_object_header *h,
141 struct lu_device *d);
143 * process config specific for device
145 int (*ldo_process_config)(const struct lu_env *env,
146 struct lu_device *, struct lustre_cfg *);
147 int (*ldo_recovery_complete)(const struct lu_env *,
153 * Type of "printer" function used by ->loo_object_print() method.
155 * Printer function is needed to provide some flexibility in (semi-)debugging
156 * output: possible implementations: printk, CDEBUG, sysfs/seq_file
158 typedef int (*lu_printer_t)(const struct lu_env *env,
159 void *cookie, const char *format, ...)
160 __attribute__ ((format (printf, 3, 4)));
163 * Operations specific for particular lu_object.
165 struct lu_object_operations {
168 * Allocate lower-layer parts of the object by calling
169 * ->ldo_object_alloc() of the corresponding underlying device.
171 * This method is called once for each object inserted into object
172 * stack. It's responsibility of this method to insert lower-layer
173 * object(s) it create into appropriate places of object stack.
175 int (*loo_object_init)(const struct lu_env *env,
176 struct lu_object *o);
178 * Called (in top-to-bottom order) during object allocation after all
179 * layers were allocated and initialized. Can be used to perform
180 * initialization depending on lower layers.
182 int (*loo_object_start)(const struct lu_env *env,
183 struct lu_object *o);
185 * Called before ->loo_object_free() to signal that object is being
186 * destroyed. Dual to ->loo_object_init().
188 void (*loo_object_delete)(const struct lu_env *env,
189 struct lu_object *o);
192 * Dual to ->ldo_object_alloc(). Called when object is removed from
195 void (*loo_object_free)(const struct lu_env *env,
196 struct lu_object *o);
199 * Called when last active reference to the object is released (and
200 * object returns to the cache). This method is optional.
202 void (*loo_object_release)(const struct lu_env *env,
203 struct lu_object *o);
205 * Debugging helper. Print given object.
207 int (*loo_object_print)(const struct lu_env *env, void *cookie,
208 lu_printer_t p, const struct lu_object *o);
210 * Optional debugging method. Returns true iff method is internally
213 int (*loo_object_invariant)(const struct lu_object *o);
219 struct lu_device_type;
222 * Device: a layer in the server side abstraction stacking.
226 * reference count. This is incremented, in particular, on each object
227 * created at this layer.
229 * XXX which means that atomic_t is probably too small.
233 * Pointer to device type. Never modified once set.
235 struct lu_device_type *ld_type;
237 * Operation vector for this device.
239 struct lu_device_operations *ld_ops;
241 * Stack this device belongs to.
243 struct lu_site *ld_site;
244 struct proc_dir_entry *ld_proc_entry;
246 /* XXX: temporary back pointer into obd. */
247 struct obd_device *ld_obd;
250 struct lu_device_type_operations;
253 * Tag bits for device type. They are used to distinguish certain groups of
257 /* this is meta-data device */
258 LU_DEVICE_MD = (1 << 0),
259 /* this is data device */
260 LU_DEVICE_DT = (1 << 1)
266 struct lu_device_type {
268 * Tag bits. Taken from enum lu_device_tag. Never modified once set.
272 * Name of this class. Unique system-wide. Never modified once set.
276 * Operations for this type.
278 struct lu_device_type_operations *ldt_ops;
280 * XXX: temporary pointer to associated obd_type.
282 struct obd_type *ldt_obd_type;
284 * XXX: temporary: context tags used by obd_*() calls.
290 * Operations on a device type.
292 struct lu_device_type_operations {
294 * Allocate new device.
296 struct lu_device *(*ldto_device_alloc)(const struct lu_env *env,
297 struct lu_device_type *t,
298 struct lustre_cfg *lcfg);
300 * Free device. Dual to ->ldto_device_alloc(). Returns pointer to
301 * the next device in the stack.
303 struct lu_device *(*ldto_device_free)(const struct lu_env *,
307 * Initialize the devices after allocation
309 int (*ldto_device_init)(const struct lu_env *env,
310 struct lu_device *, const char *,
313 * Finalize device. Dual to ->ldto_device_init(). Returns pointer to
314 * the next device in the stack.
316 struct lu_device *(*ldto_device_fini)(const struct lu_env *env,
320 * Initialize device type. This is called on module load.
322 int (*ldto_init)(struct lu_device_type *t);
324 * Finalize device type. Dual to ->ldto_init(). Called on module
327 void (*ldto_fini)(struct lu_device_type *t);
331 * Flags for the object layers.
333 enum lu_object_flags {
335 * this flags is set if ->loo_object_init() has been called for this
336 * layer. Used by lu_object_alloc().
338 LU_OBJECT_ALLOCATED = (1 << 0)
342 * Common object attributes.
358 LA_BLKSIZE = 1 << 12,
363 __u64 la_size; /* size in bytes */
364 __u64 la_mtime; /* modification time in seconds since Epoch */
365 __u64 la_atime; /* access time in seconds since Epoch */
366 __u64 la_ctime; /* change time in seconds since Epoch */
367 __u64 la_blocks; /* 512-byte blocks allocated to object */
368 __u32 la_mode; /* permission bits and file type */
369 __u32 la_uid; /* owner id */
370 __u32 la_gid; /* group id */
371 __u32 la_flags; /* object flags */
372 __u32 la_nlink; /* number of persistent references to this
374 __u32 la_blkbits; /* blk bits of the object*/
375 __u32 la_blksize; /* blk size of the object*/
377 __u32 la_rdev; /* real device */
378 __u64 la_valid; /* valid bits */
382 * Layer in the layered object.
386 * Header for this object.
388 struct lu_object_header *lo_header;
390 * Device for this layer.
392 struct lu_device *lo_dev;
394 * Operations for this object.
396 struct lu_object_operations *lo_ops;
398 * Linkage into list of all layers.
400 struct list_head lo_linkage;
402 * Depth. Top level layer depth is 0.
406 * Flags from enum lu_object_flags.
408 unsigned long lo_flags;
411 enum lu_object_header_flags {
413 * Don't keep this object in cache. Object will be destroyed as soon
414 * as last reference to it is released. This flag cannot be cleared
417 LU_OBJECT_HEARD_BANSHEE = 0
420 enum lu_object_header_attr {
421 LOHA_EXISTS = 1 << 0,
422 LOHA_REMOTE = 1 << 1,
424 * UNIX file type is stored in S_IFMT bits.
426 LOHA_FT_START = 1 << 12, /* S_IFIFO */
427 LOHA_FT_END = 1 << 15, /* S_IFREG */
431 * "Compound" object, consisting of multiple layers.
433 * Compound object with given fid is unique with given lu_site.
435 * Note, that object does *not* necessary correspond to the real object in the
436 * persistent storage: object is an anchor for locking and method calling, so
437 * it is created for things like not-yet-existing child created by mkdir or
438 * create calls. ->loo_exists() can be used to check whether object is backed
439 * by persistent storage entity.
441 struct lu_object_header {
443 * Object flags from enum lu_object_header_flags. Set and checked
446 unsigned long loh_flags;
448 * Object reference count. Protected by site guard lock.
452 * Fid, uniquely identifying this object.
454 struct lu_fid loh_fid;
456 * Common object attributes, cached for efficiency. From enum
457 * lu_object_header_attr.
461 * Linkage into per-site hash table. Protected by site guard lock.
463 struct hlist_node loh_hash;
465 * Linkage into per-site LRU list. Protected by site guard lock.
467 struct list_head loh_lru;
469 * Linkage into list of layers. Never modified once set (except lately
470 * during object destruction). No locking is necessary.
472 struct list_head loh_layers;
478 * lu_site is a "compartment" within which objects are unique, and LRU
479 * discipline is maintained.
481 * lu_site exists so that multiple layered stacks can co-exist in the same
484 * lu_site has the same relation to lu_device as lu_object_header to
491 * - ->ls_hash hash table (and its linkages in objects);
493 * - ->ls_lru list (and its linkages in objects);
495 * - 0/1 transitions of object ->loh_ref reference count;
501 * Hash-table where objects are indexed by fid.
503 struct hlist_head *ls_hash;
505 * Bit-mask for hash-table size.
509 * Order of hash-table.
513 * Number of buckets in the hash-table.
518 * LRU list, updated on each access to object. Protected by
521 * "Cold" end of LRU is ->ls_lru.next. Accessed object are moved to
522 * the ->ls_lru.prev (this is due to the non-existence of
523 * list_for_each_entry_safe_reverse()).
525 struct list_head ls_lru;
527 * Total number of objects in this site. Protected by ->ls_guard.
531 * Total number of objects in this site with reference counter greater
532 * than 0. Protected by ->ls_guard.
537 * Top-level device for this stack.
539 struct lu_device *ls_top_dev;
541 * mds number of this site.
545 * Fid location database
547 struct lu_server_fld *ls_server_fld;
548 struct lu_client_fld *ls_client_fld;
553 struct lu_server_seq *ls_server_seq;
556 * Controller Seq Manager
558 struct lu_server_seq *ls_control_seq;
559 struct obd_export *ls_control_exp;
564 struct lu_client_seq *ls_client_seq;
566 /* statistical counters. Protected by nothing, races are accepted. */
572 * Number of hash-table entry checks made.
574 * ->s_cache_check / (->s_cache_miss + ->s_cache_hit)
576 * is an average number of hash slots inspected during single
580 /* raced cache insertions */
586 * Linkage into global list of sites.
588 struct list_head ls_linkage;
589 struct lprocfs_stats *ls_time_stats;
593 * Constructors/destructors.
597 * Initialize site @s, with @d as the top level device.
599 int lu_site_init(struct lu_site *s, struct lu_device *d);
601 * Finalize @s and release its resources.
603 void lu_site_fini(struct lu_site *s);
606 * Called when initialization of stack for this site is completed.
608 int lu_site_init_finish(struct lu_site *s);
611 * Acquire additional reference on device @d
613 void lu_device_get(struct lu_device *d);
615 * Release reference on device @d.
617 void lu_device_put(struct lu_device *d);
620 * Initialize device @d of type @t.
622 int lu_device_init(struct lu_device *d, struct lu_device_type *t);
624 * Finalize device @d.
626 void lu_device_fini(struct lu_device *d);
629 * Initialize compound object.
631 int lu_object_header_init(struct lu_object_header *h);
633 * Finalize compound object.
635 void lu_object_header_fini(struct lu_object_header *h);
638 * Initialize object @o that is part of compound object @h and was created by
641 int lu_object_init(struct lu_object *o,
642 struct lu_object_header *h, struct lu_device *d);
644 * Finalize object and release its resources.
646 void lu_object_fini(struct lu_object *o);
648 * Add object @o as first layer of compound object @h.
650 * This is typically called by the ->ldo_object_alloc() method of top-level
653 void lu_object_add_top(struct lu_object_header *h, struct lu_object *o);
655 * Add object @o as a layer of compound object, going after @before.1
657 * This is typically called by the ->ldo_object_alloc() method of
660 void lu_object_add(struct lu_object *before, struct lu_object *o);
663 * Caching and reference counting.
667 * Acquire additional reference to the given object. This function is used to
668 * attain additional reference. To acquire initial reference use
671 static inline void lu_object_get(struct lu_object *o)
673 LASSERT(atomic_read(&o->lo_header->loh_ref) > 0);
674 atomic_inc(&o->lo_header->loh_ref);
678 * Return true of object will not be cached after last reference to it is
681 static inline int lu_object_is_dying(const struct lu_object_header *h)
683 return test_bit(LU_OBJECT_HEARD_BANSHEE, &h->loh_flags);
687 * Decrease reference counter on object. If last reference is freed, return
688 * object to the cache, unless lu_object_is_dying(o) holds. In the latter
689 * case, free object immediately.
691 void lu_object_put(const struct lu_env *env,
692 struct lu_object *o);
695 * Free @nr objects from the cold end of the site LRU list.
697 int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr);
700 * Print all objects in @s.
702 void lu_site_print(const struct lu_env *env, struct lu_site *s, void *cookie,
703 lu_printer_t printer);
705 * Search cache for an object with the fid @f. If such object is found, return
706 * it. Otherwise, create new object, insert it into cache and return it. In
707 * any case, additional reference is acquired on the returned object.
709 struct lu_object *lu_object_find(const struct lu_env *env,
710 struct lu_site *s, const struct lu_fid *f);
717 * First (topmost) sub-object of given compound object
719 static inline struct lu_object *lu_object_top(struct lu_object_header *h)
721 LASSERT(!list_empty(&h->loh_layers));
722 return container_of0(h->loh_layers.next, struct lu_object, lo_linkage);
726 * Next sub-object in the layering
728 static inline struct lu_object *lu_object_next(const struct lu_object *o)
730 return container_of0(o->lo_linkage.next, struct lu_object, lo_linkage);
734 * Pointer to the fid of this object.
736 static inline const struct lu_fid *lu_object_fid(const struct lu_object *o)
738 return &o->lo_header->loh_fid;
742 * return device operations vector for this object
744 static inline struct lu_device_operations *
745 lu_object_ops(const struct lu_object *o)
747 return o->lo_dev->ld_ops;
751 * Given a compound object, find its slice, corresponding to the device type
754 struct lu_object *lu_object_locate(struct lu_object_header *h,
755 struct lu_device_type *dtype);
757 struct lu_cdebug_print_info {
760 const char *lpi_file;
766 * Printer function emitting messages through libcfs_debug_msg().
768 int lu_cdebug_printer(const struct lu_env *env,
769 void *cookie, const char *format, ...);
771 #define DECLARE_LU_CDEBUG_PRINT_INFO(var, mask) \
772 struct lu_cdebug_print_info var = { \
773 .lpi_subsys = DEBUG_SUBSYSTEM, \
774 .lpi_mask = (mask), \
775 .lpi_file = __FILE__, \
776 .lpi_fn = __FUNCTION__, \
777 .lpi_line = __LINE__ \
781 * Print object description followed by user-supplied message.
783 #define LU_OBJECT_DEBUG(mask, env, object, format, ...) \
785 static DECLARE_LU_CDEBUG_PRINT_INFO(__info, mask); \
787 lu_object_print(env, &__info, lu_cdebug_printer, object); \
788 CDEBUG(mask, format , ## __VA_ARGS__); \
792 * Print human readable representation of the @o to the @f.
794 void lu_object_print(const struct lu_env *env, void *cookie,
795 lu_printer_t printer, const struct lu_object *o);
798 * Check object consistency.
800 int lu_object_invariant(const struct lu_object *o);
803 * Finalize and free devices in the device stack.
805 void lu_stack_fini(const struct lu_env *env, struct lu_device *top);
808 * Returns 1 iff object @o exists on the stable storage,
809 * returns -1 iff object @o is on remote server.
811 static inline int lu_object_exists(const struct lu_object *o)
815 attr = o->lo_header->loh_attr;
816 if (attr & LOHA_REMOTE)
818 else if (attr & LOHA_EXISTS)
824 static inline int lu_object_assert_exists(const struct lu_object *o)
826 return lu_object_exists(o) != 0;
829 static inline int lu_object_assert_not_exists(const struct lu_object *o)
831 return lu_object_exists(o) <= 0;
835 * Attr of this object.
837 static inline __u32 lu_object_attr(const struct lu_object *o)
839 LASSERT(lu_object_exists(o) > 0);
840 return o->lo_header->loh_attr;
844 /* input params, should be filled out by mdt */
845 __u64 rp_hash; /* hash */
846 int rp_count; /* count in bytes */
847 int rp_npages; /* number of pages */
848 struct page **rp_pages; /* pointers to pages */
851 enum lu_xattr_flags {
852 LU_XATTR_REPLACE = (1 << 0),
853 LU_XATTR_CREATE = (1 << 1)
856 /* For lu_context health-checks */
857 enum lu_context_state {
865 * lu_context. Execution context for lu_object methods. Currently associated
868 * All lu_object methods, except device and device type methods (called during
869 * system initialization and shutdown) are executed "within" some
870 * lu_context. This means, that pointer to some "current" lu_context is passed
871 * as an argument to all methods.
873 * All service ptlrpc threads create lu_context as part of their
874 * initialization. It is possible to create "stand-alone" context for other
875 * execution environments (like system calls).
877 * lu_object methods mainly use lu_context through lu_context_key interface
878 * that allows each layer to associate arbitrary pieces of data with each
879 * context (see pthread_key_create(3) for similar interface).
884 * Theoretically we'd want to use lu_objects and lu_contexts on the
885 * client side too. On the other hand, we don't want to allocate
886 * values of server-side keys for the client contexts and vice versa.
888 * To achieve this, set of tags in introduced. Contexts and keys are
889 * marked with tags. Key value are created only for context whose set
890 * of tags has non-empty intersection with one for key. Tags are taken
891 * from enum lu_context_tag.
895 * Pointer to the home service thread. NULL for other execution
898 struct ptlrpc_thread *lc_thread;
900 * Pointer to an array with key values. Internal implementation
904 enum lu_context_state lc_state;
908 * lu_context_key interface. Similar to pthread_key.
911 enum lu_context_tag {
913 * Thread on md server
915 LCT_MD_THREAD = 1 << 0,
917 * Thread on dt server
919 LCT_DT_THREAD = 1 << 1,
921 * Context for transaction handle
923 LCT_TX_HANDLE = 1 << 2,
927 LCT_CL_THREAD = 1 << 3,
929 * Per-request session on server
931 LCT_SESSION = 1 << 4,
933 * Don't add references for modules creating key values in that context.
934 * This is only for contexts used internally by lu_object framework.
938 * Contexts usable in cache shrinker thread.
940 LCT_SHRINKER = LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD|LCT_NOREF
944 * Key. Represents per-context value slot.
946 struct lu_context_key {
948 * Set of tags for which values of this key are to be instantiated.
952 * Value constructor. This is called when new value is created for a
953 * context. Returns pointer to new value of error pointer.
955 void *(*lct_init)(const struct lu_context *ctx,
956 struct lu_context_key *key);
958 * Value destructor. Called when context with previously allocated
959 * value of this slot is destroyed. @data is a value that was returned
960 * by a matching call to ->lct_init().
962 void (*lct_fini)(const struct lu_context *ctx,
963 struct lu_context_key *key, void *data);
965 * Optional method called on lu_context_exit() for all allocated
966 * keys. Can be used by debugging code checking that locks are
969 void (*lct_exit)(const struct lu_context *ctx,
970 struct lu_context_key *key, void *data);
972 * Internal implementation detail: index within ->lc_value[] reserved
977 * Internal implementation detail: number of values created for this
982 * Internal implementation detail: module for this key.
984 struct module *lct_owner;
987 #define LU_KEY_INIT(mod, type) \
988 static void* mod##_key_init(const struct lu_context *ctx, \
989 struct lu_context_key *key) \
993 CLASSERT(CFS_PAGE_SIZE >= sizeof (*value)); \
995 OBD_ALLOC_PTR(value); \
997 value = ERR_PTR(-ENOMEM); \
1001 struct __##mod##__dummy_init {;} /* semicolon catcher */
1003 #define LU_KEY_FINI(mod, type) \
1004 static void mod##_key_fini(const struct lu_context *ctx, \
1005 struct lu_context_key *key, void* data) \
1007 type *info = data; \
1009 OBD_FREE_PTR(info); \
1011 struct __##mod##__dummy_fini {;} /* semicolon catcher */
1013 #define LU_KEY_INIT_FINI(mod, type) \
1014 LU_KEY_INIT(mod,type); \
1015 LU_KEY_FINI(mod,type)
1017 #define LU_CONTEXT_KEY_DEFINE(mod, tags) \
1018 struct lu_context_key mod##_thread_key = { \
1020 .lct_init = mod##_key_init, \
1021 .lct_fini = mod##_key_fini \
1024 #define LU_CONTEXT_KEY_INIT(key) \
1026 (key)->lct_owner = THIS_MODULE; \
1033 int lu_context_key_register(struct lu_context_key *key);
1037 void lu_context_key_degister(struct lu_context_key *key);
1039 #define LU_KEY_REGISTER_GENERIC(mod) \
1040 static int mod##_key_register_generic(struct lu_context_key *k, ...) \
1042 struct lu_context_key* key = k; \
1046 va_start(args, k); \
1049 LU_CONTEXT_KEY_INIT(key); \
1050 result = lu_context_key_register(key); \
1053 key = va_arg(args, struct lu_context_key*); \
1054 } while (key != NULL); \
1059 va_start(args, k); \
1060 while (k != key) { \
1061 lu_context_key_degister(k); \
1062 k = va_arg(args, struct lu_context_key*); \
1070 #define LU_KEY_DEGISTER_GENERIC(mod) \
1071 static void mod##_key_degister_generic(struct lu_context_key *k, ...) \
1075 va_start(args, k); \
1078 lu_context_key_degister(k); \
1079 k = va_arg(args, struct lu_context_key*); \
1080 } while (k != NULL); \
1085 #define LU_TYPE_INIT(mod, ...) \
1086 LU_KEY_REGISTER_GENERIC(mod) \
1087 static int mod##_type_init(struct lu_device_type *t) \
1089 return mod##_key_register_generic(__VA_ARGS__, NULL); \
1091 struct __##mod##_dummy_type_init {;}
1093 #define LU_TYPE_FINI(mod, ...) \
1094 LU_KEY_DEGISTER_GENERIC(mod) \
1095 static void mod##_type_fini(struct lu_device_type *t) \
1097 mod##_key_degister_generic(__VA_ARGS__, NULL); \
1099 struct __##mod##_dummy_type_fini {;}
1101 #define LU_TYPE_INIT_FINI(mod, ...) \
1102 LU_TYPE_INIT(mod, __VA_ARGS__); \
1103 LU_TYPE_FINI(mod, __VA_ARGS__)
1106 * Return value associated with key @key in context @ctx.
1108 void *lu_context_key_get(const struct lu_context *ctx,
1109 struct lu_context_key *key);
1112 * Initialize context data-structure. Create values for all keys.
1114 int lu_context_init(struct lu_context *ctx, __u32 tags);
1116 * Finalize context data-structure. Destroy key values.
1118 void lu_context_fini(struct lu_context *ctx);
1121 * Called before entering context.
1123 void lu_context_enter(struct lu_context *ctx);
1125 * Called after exiting from @ctx
1127 void lu_context_exit(struct lu_context *ctx);
1130 * Allocate for context all missing keys that were registered after context
1133 int lu_context_refill(const struct lu_context *ctx);
1140 * "Local" context, used to store data instead of stack.
1142 struct lu_context le_ctx;
1144 * "Session" context for per-request data.
1146 struct lu_context *le_ses;
1149 int lu_env_init(struct lu_env *env, struct lu_context *ses, __u32 tags);
1150 void lu_env_fini(struct lu_env *env);
1153 * Common name structure to be passed around for various name related methods.
1161 * Common buffer structure to be passed around for various xattr_{s,g}et()
1169 extern struct lu_buf LU_BUF_NULL; /* null buffer */
1171 #define DLUBUF "(%p %z)"
1172 #define PLUBUF(buf) (buf)->lb_buf, (buf)->lb_len
1174 * One-time initializers, called at obdclass module initialization, not
1179 * Initialization of global lu_* data.
1181 int lu_global_init(void);
1184 * Dual to lu_global_init().
1186 void lu_global_fini(void);
1189 LU_TIME_FIND_LOOKUP,
1191 LU_TIME_FIND_INSERT,
1195 extern const char *lu_time_names[LU_TIME_NR];
1197 #endif /* __LUSTRE_LU_OBJECT_H */