+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * Copyright (C) 2006 Cluster File Systems, Inc.
- *
- * This file is part of Lustre, http://www.lustre.org.
- *
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * Lustre is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#ifndef __LUSTRE_DT_OBJECT_H
-#define __LUSTRE_DT_OBJECT_H
-
-/*
- * Sub-class of lu_object with methods common for "data" objects in OST stack.
- *
- * Data objects behave like regular files: you can read/write them, get and
- * set their attributes. Implementation of dt interface is supposed to
- * implement some form of garbage collection, normally reference counting
- * (nlink) based one.
- *
- * Examples: osd (lustre/osd) is an implementation of dt interface.
- */
-
-
-/*
- * super-class definitions.
- */
-#include <lu_object.h>
-
-#include <libcfs/list.h>
-#include <libcfs/kp30.h>
-
-struct seq_file;
-struct proc_dir_entry;
-struct lustre_cfg;
-
-struct thandle;
-struct txn_param;
-struct dt_device;
-struct dt_object;
-
-/*
- * Lock mode for DT objects.
- */
-enum dt_lock_mode {
- DT_WRITE_LOCK = 1,
- DT_READ_LOCK = 2,
-};
-
-/*
- * Operations on dt device.
- */
-struct dt_device_operations {
- /*
- * Method for getting/setting device wide back stored config data,
- * like last used meta-sequence, etc.
- *
- * XXX this is ioctl()-like interface we want to get rid of.
- */
- int (*dt_config) (struct lu_context *ctx,
- struct dt_device *dev, const char *name,
- void *buf, int size, int mode);
- /*
- * Return device-wide statistics.
- */
- int (*dt_statfs)(struct lu_context *ctx,
- struct dt_device *dev, struct kstatfs *sfs);
- /*
- * Start transaction, described by @param.
- */
- struct thandle *(*dt_trans_start)(struct lu_context *ctx,
- struct dt_device *dev,
- struct txn_param *param);
- /*
- * Finish previously started transaction.
- */
- void (*dt_trans_stop)(struct lu_context *ctx, struct thandle *th);
- /*
- * Return fid of root index object.
- */
- int (*dt_root_get)(struct lu_context *ctx,
- struct dt_device *dev, struct lu_fid *f);
-};
-
-/*
- * Per-dt-object operations.
- */
-struct dt_object_operations {
- void (*do_object_lock)(struct lu_context *ctx,
- struct dt_object *dt, enum dt_lock_mode mode);
- void (*do_object_unlock)(struct lu_context *ctx,
- struct dt_object *dt, enum dt_lock_mode mode);
- /*
- * Note: following ->do_{x,}attr_{set,get}() operations are very
- * similar to ->moo_{x,}attr_{set,get}() operations in struct
- * md_object_operations (see md_object.h). These operations are not in
- * lu_object_operations, because ->do_{x,}attr_set() versions take
- * transaction handle as an argument (this transaction is started by
- * caller). We might factor ->do_{x,}attr_get() into
- * lu_object_operations, but that would break existing symmetry.
- */
-
- /*
- * Return standard attributes.
- *
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*do_attr_get)(struct lu_context *ctxt, struct dt_object *dt,
- struct lu_attr *attr);
- /*
- * Set standard attributes.
- *
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*do_attr_set)(struct lu_context *ctxt, struct dt_object *dt,
- struct lu_attr *attr, struct thandle *handle);
- /*
- * Return a value of an extended attribute.
- *
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*do_xattr_get)(struct lu_context *ctxt, struct dt_object *dt,
- void *buf, int buf_len, const char *name);
- /*
- * Set value of an extended attribute.
- *
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*do_xattr_set)(struct lu_context *ctxt, struct dt_object *dt,
- void *buf, int buf_len, const char *name,
- struct thandle *handle);
- /*
- * Create new object on this device.
- *
- * precondition: !lu_object_exists(ctxt, &dt->do_lu);
- * postcondition: ergo(result == 0, lu_object_exists(ctxt, &dt->do_lu));
- */
- int (*do_object_create)(struct lu_context *ctxt, struct dt_object *dt,
- struct lu_attr *attr, struct thandle *th);
- /*
- * Destroy existing object.
- *
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- * postcondition: ergo(result == 0,
- * !lu_object_exists(ctxt, &dt->do_lu));
- */
- int (*do_object_destroy)(struct lu_context *ctxt,
- struct dt_object *dt, struct thandle *th);
-};
-
-/*
- * Per-dt-object operations on "file body".
- */
-struct dt_body_operations {
- /*
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*dbo_read)(struct lu_context *ctxt, struct dt_object *dt, ...);
- /*
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*dbo_write)(struct lu_context *ctxt, struct dt_object *dt, ...);
- /*
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*dbo_truncate)(struct lu_context *ctxt, struct dt_object *dt, ...);
-};
-
-/*
- * Incomplete type of index record.
- */
-struct dt_rec;
-
-/*
- * Incomplete type of index key.
- */
-struct dt_key;
-
-struct dt_index_features {
- /* required feature flags from enum dt_index_flags */
- __u32 dif_flags;
- /* minimal required key size */
- size_t dif_keysize_min;
- /* maximal required key size, 0 if no limit */
- size_t dif_keysize_max;
- /* minimal required record size */
- size_t dif_recsize_min;
- /* maximal required record size, 0 if no limit */
- size_t dif_recsize_max;
-};
-
-enum dt_index_flags {
- /* index supports variable sized keys */
- DT_IND_VARKEY = 1 << 0,
- /* index supports variable sized records */
- DT_IND_VARREC = 1 << 1,
- /* index can be modified */
- DT_IND_UPDATE = 1 << 2,
- /* index supports records with non-unique (duplicate) keys */
- DT_IND_NONUNQ = 1 << 3
-};
-
-/*
- * Features, required from index to support file system directories (mapping
- * names to fids).
- */
-extern const struct dt_index_features dt_directory_features;
-
-/*
- * Per-dt-object operations on object as index.
- */
-struct dt_index_operations {
- /*
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*dio_lookup)(struct lu_context *ctxt, struct dt_object *dt,
- struct dt_rec *rec, const struct dt_key *key);
- /*
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*dio_insert)(struct lu_context *ctxt, struct dt_object *dt,
- const struct dt_rec *rec, const struct dt_key *key,
- struct thandle *handle);
- /*
- * precondition: lu_object_exists(ctxt, &dt->do_lu);
- */
- int (*dio_delete)(struct lu_context *ctxt, struct dt_object *dt,
- const struct dt_rec *rec, const struct dt_key *key,
- struct thandle *handle);
-
- /*
- * Features probing. Returns 1 if this index supports all features in
- * @feat, -ve on error, 0 otherwise.
- */
- int (*dio_probe)(struct lu_context *ctxt, struct dt_object *dt,
- const struct dt_index_features *feat);
-};
-
-struct dt_device {
- struct lu_device dd_lu_dev;
- struct dt_device_operations *dd_ops;
- /*
- * List of dt_txn_callback (see below). This is not protected in any
- * way, because callbacks are supposed to be added/deleted only during
- * single-threaded start-up shut-down procedures.
- */
- struct list_head dd_txn_callbacks;
-};
-
-int dt_device_init(struct dt_device *dev, struct lu_device_type *t);
-void dt_device_fini(struct dt_device *dev);
-
-static inline int lu_device_is_dt(const struct lu_device *d)
-{
- return ergo(d != NULL, d->ld_type->ldt_tags & LU_DEVICE_DT);
-}
-
-static inline struct dt_device * lu2dt_dev(struct lu_device *l)
-{
- LASSERT(lu_device_is_dt(l));
- return container_of0(l, struct dt_device, dd_lu_dev);
-}
-
-struct dt_object {
- struct lu_object do_lu;
- struct dt_object_operations *do_ops;
- struct dt_body_operations *do_body_ops;
- struct dt_index_operations *do_index_ops;
-};
-
-int dt_object_init(struct dt_object *obj,
- struct lu_object_header *h, struct lu_device *d);
-
-void dt_object_fini(struct dt_object *obj);
-
-struct txn_param {
- unsigned int tp_credits;
-};
-
-struct thandle {
- struct dt_device *th_dev;
-};
-
-/*
- * Transaction call-backs.
- *
- * These are invoked by osd (or underlying transaction engine) when
- * transaction changes state.
- *
- * Call-backs are used by upper layers to modify transaction parameters and to
- * perform some actions on for each transaction state transition. Typical
- * example is mdt registering call-back to write into last-received file
- * before each transaction commit.
- */
-struct dt_txn_callback {
- int (*dtc_txn_start)(struct lu_context *ctx, struct dt_device *dev,
- struct txn_param *param, void *cookie);
- int (*dtc_txn_stop)(struct lu_context *ctx, struct dt_device *dev,
- struct thandle *txn, void *cookie);
- int (*dtc_txn_commit)(struct lu_context *ctx, struct dt_device *dev,
- struct thandle *txn, void *cookie);
- void *dtc_cookie;
- struct list_head dtc_linkage;
-};
-
-void dt_txn_callback_add(struct dt_device *dev, struct dt_txn_callback *cb);
-void dt_txn_callback_del(struct dt_device *dev, struct dt_txn_callback *cb);
-
-int dt_txn_hook_start(struct lu_context *ctx,
- struct dt_device *dev, struct txn_param *param);
-int dt_txn_hook_stop(struct lu_context *ctx,
- struct dt_device *dev, struct thandle *txn);
-int dt_txn_hook_commit(struct lu_context *ctx,
- struct dt_device *dev, struct thandle *txn);
-
-#endif /* __LUSTRE_DT_OBJECT_H */
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * Copyright (C) 2006 Cluster File Systems, Inc.
- *
- * This file is part of Lustre, http://www.lustre.org.
- *
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * Lustre is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#ifndef __LUSTRE_LU_OBJECT_H
-#define __LUSTRE_LU_OBJECT_H
-
-/*
- * struct lu_fid
- */
-#include <lustre/lustre_idl.h>
-
-#include <libcfs/list.h>
-#include <libcfs/kp30.h>
-
-/*
- * Layered objects support for CMD3/C5.
- */
-
-
-struct seq_file;
-struct proc_dir_entry;
-struct lustre_cfg;
-
-/*
- * lu_* data-types represent server-side entities shared by data and meta-data
- * stacks.
- *
- * Design goals:
- *
- * 0. support for layering.
- *
- * Server side object is split into layers, one per device in the
- * corresponding device stack. Individual layer is represented by struct
- * lu_object. Compound layered object --- by struct lu_object_header. Most
- * interface functions take lu_object as an argument and operate on the
- * whole compound object. This decision was made due to the following
- * reasons:
- *
- * - it's envisaged that lu_object will be used much more often than
- * lu_object_header;
- *
- * - we want lower (non-top) layers to be able to initiate operations
- * on the whole object.
- *
- * Generic code supports layering more complex than simple stacking, e.g.,
- * it is possible that at some layer object "spawns" multiple sub-objects
- * on the lower layer.
- *
- * 1. fid-based identification.
- *
- * Compound object is uniquely identified by its fid. Objects are indexed
- * by their fids (hash table is used for index).
- *
- * 2. caching and life-cycle management.
- *
- * Object's life-time is controlled by reference counting. When reference
- * count drops to 0, object is returned to cache. Cached objects still
- * retain their identity (i.e., fid), and can be recovered from cache.
- *
- * Objects are kept in the global LRU list, and lu_site_purge() function
- * can be used to reclaim given number of unused objects from the tail of
- * the LRU.
- *
- * 3. avoiding recursion.
- *
- * Generic code tries to replace recursion through layers by iterations
- * where possible. Additionally to the end of reducing stack consumption,
- * data, when practically possible, are allocated through lu_context_key
- * interface rather than on stack.
- *
- */
-
-struct lu_site;
-struct lu_object;
-struct lu_device;
-struct lu_object_header;
-struct lu_context;
-/*
- * Operations common for data and meta-data devices.
- */
-struct lu_device_operations {
- /*
- * Object creation protocol.
- *
- * Due to design goal of avoiding recursion, object creation (see
- * lu_object_alloc()) is somewhat involved:
- *
- * - first, ->ldo_object_alloc() method of the top-level device
- * in the stack is called. It should allocate top level object
- * (including lu_object_header), but without any lower-layer
- * sub-object(s).
- *
- * - then lu_object_alloc() sets fid in the header of newly created
- * object.
- *
- * - then ->loo_object_init() (a method from struct
- * lu_object_operations) is called. It has to allocate lower-layer
- * object(s). To do this, ->loo_object_init() calls
- * ldo_object_alloc() of the lower-layer device(s).
- *
- * - for all new objects allocated by ->loo_object_init() (and
- * inserted into object stack), ->loo_object_init() is called again
- * repeatedly, until no new objects are created.
- *
- */
-
- /*
- * Allocate object for the given device (without lower-layer
- * parts). This is called by ->loo_object_init() from the parent
- * layer, and should setup at least ->lo_dev and ->lo_ops fields of
- * resulting lu_object.
- *
- * postcondition: ergo(!IS_ERR(result), result->lo_dev == d &&
- * result->lo_ops != NULL);
- */
- struct lu_object *(*ldo_object_alloc)(struct lu_context *ctx,
- struct lu_device *d);
- /*
- * Dual to ->ldo_object_alloc(). Called when object is removed from
- * memory.
- */
- void (*ldo_object_free)(struct lu_context *ctx, struct lu_object *o);
-
- /*
- * process config specific for device
- */
- int (*ldo_process_config)(struct lu_context *ctx,
- struct lu_device *, struct lustre_cfg *);
-};
-
-/*
- * Operations specific for particular lu_object.
- */
-struct lu_object_operations {
-
- /*
- * Allocate lower-layer parts of the object by calling
- * ->ldo_object_alloc() of the corresponding underlying device.
- *
- * This method is called once for each object inserted into object
- * stack. It's responsibility of this method to insert lower-layer
- * object(s) it create into appropriate places of object stack.
- */
- int (*loo_object_init)(struct lu_context *ctx, struct lu_object *o);
- /*
- * Called before ->ldo_object_free() to signal that object is being
- * destroyed. Dual to ->loo_object_init().
- */
- void (*loo_object_delete)(struct lu_context *ctx, struct lu_object *o);
-
- /*
- * Called when last active reference to the object is released (and
- * object returns to the cache).
- */
- void (*loo_object_release)(struct lu_context *ctx, struct lu_object *o);
-
- /*
- * Return true off object @o exists on a storage.
- */
- int (*loo_object_exists)(struct lu_context *ctx, struct lu_object *o);
- /*
- * Debugging helper. Print given object.
- */
- int (*loo_object_print)(struct lu_context *ctx,
- struct seq_file *f, const struct lu_object *o);
-};
-
-/*
- * Type of lu_device.
- */
-struct lu_device_type;
-
-/*
- * Device: a layer in the server side abstraction stacking.
- */
-struct lu_device {
- /*
- * reference count. This is incremented, in particular, on each object
- * created at this layer.
- *
- * XXX which means that atomic_t is probably too small.
- */
- atomic_t ld_ref;
- /*
- * Pointer to device type. Never modified once set.
- */
- struct lu_device_type *ld_type;
- /*
- * Operation vector for this device.
- */
- struct lu_device_operations *ld_ops;
- /*
- * Stack this device belongs to.
- */
- struct lu_site *ld_site;
- struct proc_dir_entry *ld_proc_entry;
-
- /* XXX: temporary back pointer into obd. */
- struct obd_device *ld_obd;
-};
-
-struct lu_device_type_operations;
-
-/*
- * Tag bits for device type. They are used to distinguish certain groups of
- * device types.
- */
-enum lu_device_tag {
- /* this is meta-data device */
- LU_DEVICE_MD = (1 << 0),
- /* this is data device */
- LU_DEVICE_DT = (1 << 1)
-};
-
-/*
- * Type of device.
- */
-struct lu_device_type {
- /*
- * Tag bits. Taken from enum lu_device_tag. Never modified once set.
- */
- __u32 ldt_tags;
- /*
- * Name of this class. Unique system-wide. Never modified once set.
- */
- char *ldt_name;
- /*
- * Operations for this type.
- */
- struct lu_device_type_operations *ldt_ops;
- /*
- * XXX: temporary pointer to associated obd_type.
- */
- struct obd_type *ldt_obd_type;
-};
-
-/*
- * Operations on a device type.
- */
-struct lu_device_type_operations {
- /*
- * Allocate new device.
- */
- struct lu_device *(*ldto_device_alloc)(struct lu_context *ctx,
- struct lu_device_type *t,
- struct lustre_cfg *lcfg);
- /*
- * Free device. Dual to ->ldto_device_alloc().
- */
- void (*ldto_device_free)(struct lu_context *ctx, struct lu_device *d);
-
- /*
- * Initialize the devices after allocation
- */
- int (*ldto_device_init)(struct lu_context *ctx,
- struct lu_device *, struct lu_device *);
- /*
- * Finalize device. Dual to ->ldto_device_init(). Returns pointer to
- * the next device in the stack.
- */
- struct lu_device *(*ldto_device_fini)(struct lu_context *ctx,
- struct lu_device *);
-
- /*
- * Initialize device type. This is called on module load.
- */
- int (*ldto_init)(struct lu_device_type *t);
- /*
- * Finalize device type. Dual to ->ldto_init(). Called on module
- * unload.
- */
- void (*ldto_fini)(struct lu_device_type *t);
-};
-
-/*
- * Flags for the object layers.
- */
-enum lu_object_flags {
- /*
- * this flags is set if ->loo_object_init() has been called for this
- * layer. Used by lu_object_alloc().
- */
- LU_OBJECT_ALLOCATED = (1 << 0)
-};
-
-/*
- * Common object attributes.
- */
-struct lu_attr {
- __u64 la_size; /* size in bytes */
- __u64 la_mtime; /* modification time in seconds since Epoch */
- __u64 la_atime; /* access time in seconds since Epoch */
- __u64 la_ctime; /* change time in seconds since Epoch */
- __u64 la_blocks; /* 512-byte blocks allocated to object */
- __u32 la_mode; /* permission bits and file type */
- __u32 la_uid; /* owner id */
- __u32 la_gid; /* group id */
- __u32 la_flags; /* object flags */
- __u32 la_nlink; /* number of persistent references to this
- * object */
-};
-
-
-/*
- * Layer in the layered object.
- */
-struct lu_object {
- /*
- * Header for this object.
- */
- struct lu_object_header *lo_header;
- /*
- * Device for this layer.
- */
- struct lu_device *lo_dev;
- /*
- * Operations for this object.
- */
- struct lu_object_operations *lo_ops;
- /*
- * Linkage into list of all layers.
- */
- struct list_head lo_linkage;
- /*
- * Depth. Top level layer depth is 0.
- */
- int lo_depth;
- /*
- * Flags from enum lu_object_flags.
- */
- unsigned long lo_flags;
-};
-
-enum lu_object_header_flags {
- /*
- * Don't keep this object in cache. Object will be destroyed as soon
- * as last reference to it is released. This flag cannot be cleared
- * once set.
- */
- LU_OBJECT_HEARD_BANSHEE = 0,
-};
-
-/*
- * "Compound" object, consisting of multiple layers.
- *
- * Compound object with given fid is unique with given lu_site.
- *
- * Note, that object does *not* necessary correspond to the real object in the
- * persistent storage: object is an anchor for locking and method calling, so
- * it is created for things like not-yet-existing child created by mkdir or
- * create calls. ->loo_exists() can be used to check whether object is backed
- * by persistent storage entity.
- */
-struct lu_object_header {
- /*
- * Object flags from enum lu_object_header_flags. Set and checked
- * atomically.
- */
- unsigned long loh_flags;
- /*
- * Object reference count. Protected by site guard lock.
- */
- int loh_ref;
- /*
- * Fid, uniquely identifying this object.
- */
- struct lu_fid loh_fid;
- /*
- * Linkage into per-site hash table. Protected by site guard lock.
- */
- struct hlist_node loh_hash;
- /*
- * Linkage into per-site LRU list. Protected by site guard lock.
- */
- struct list_head loh_lru;
- /*
- * Linkage into list of layers. Never modified once set (except lately
- * during object destruction). No locking is necessary.
- */
- struct list_head loh_layers;
-};
-
-struct fld;
-/*
- * lu_site is a "compartment" within which objects are unique, and LRU
- * discipline is maintained.
- *
- * lu_site exists so that multiple layered stacks can co-exist in the same
- * address space.
- *
- * lu_site has the same relation to lu_device as lu_object_header to
- * lu_object.
- */
-struct lu_site {
- /*
- * lock protecting:
- *
- * - ->ls_hash hash table (and its linkages in objects);
- *
- * - ->ls_lru list (and its linkages in objects);
- *
- * - 0/1 transitions of object ->loh_ref reference count;
- *
- * yes, it's heavy.
- */
- spinlock_t ls_guard;
- /*
- * Hash-table where objects are indexed by fid.
- */
- struct hlist_head *ls_hash;
- /*
- * Bit-mask for hash-table size.
- */
- int ls_hash_mask;
-
-
- /*
- * LRU list, updated on each access to object. Protected by
- * ->ls_guard.
- *
- * "Cold" end of LRU is ->ls_lru.next. Accessed object are moved to
- * the ->ls_lru.prev (this is due to the non-existence of
- * list_for_each_entry_safe_reverse()).
- */
- struct list_head ls_lru;
- /*
- * Total number of objects in this site. Protected by ->ls_guard.
- */
- unsigned ls_total;
- /*
- * Total number of objects in this site with reference counter greater
- * than 0. Protected by ->ls_guard.
- */
- unsigned ls_busy;
-
- /*
- * Top-level device for this stack.
- */
- struct lu_device *ls_top_dev;
- /* current server index */
- __u32 ls_node_id;
- /*
- * Fid location database
- */
- struct fld *ls_fld;
-
- /* statistical counters. Protected by nothing, races are accepted. */
- struct {
- __u32 s_created;
- __u32 s_cache_hit;
- __u32 s_cache_miss;
- /*
- * Number of hash-table entry checks made.
- *
- * ->s_cache_check / (->s_cache_miss + ->s_cache_hit)
- *
- * is an average number of hash slots inspected during single
- * lookup.
- */
- __u32 s_cache_check;
- /* raced cache insertions */
- __u32 s_cache_race;
- __u32 s_lru_purged;
- } ls_stats;
-};
-
-/*
- * Constructors/destructors.
- */
-
-/*
- * Initialize site @s, with @d as the top level device.
- */
-int lu_site_init(struct lu_site *s, struct lu_device *d);
-/*
- * Finalize @s and release its resources.
- */
-void lu_site_fini(struct lu_site *s);
-
-/*
- * Acquire additional reference on device @d
- */
-void lu_device_get(struct lu_device *d);
-/*
- * Release reference on device @d.
- */
-void lu_device_put(struct lu_device *d);
-
-/*
- * Initialize device @d of type @t.
- */
-int lu_device_init(struct lu_device *d, struct lu_device_type *t);
-/*
- * Finalize device @d.
- */
-void lu_device_fini(struct lu_device *d);
-
-/*
- * Initialize compound object.
- */
-int lu_object_header_init(struct lu_object_header *h);
-/*
- * Finalize compound object.
- */
-void lu_object_header_fini(struct lu_object_header *h);
-
-/*
- * Initialize object @o that is part of compound object @h and was created by
- * device @d.
- */
-int lu_object_init(struct lu_object *o,
- struct lu_object_header *h, struct lu_device *d);
-/*
- * Finalize object and release its resources.
- */
-void lu_object_fini(struct lu_object *o);
-/*
- * Add object @o as first layer of compound object @h.
- *
- * This is typically called by the ->ldo_object_alloc() method of top-level
- * device.
- */
-void lu_object_add_top(struct lu_object_header *h, struct lu_object *o);
-/*
- * Add object @o as a layer of compound object, going after @before.1
- *
- * This is typically called by the ->ldo_object_alloc() method of
- * @before->lo_dev.
- */
-void lu_object_add(struct lu_object *before, struct lu_object *o);
-
-/*
- * Caching and reference counting.
- */
-
-/*
- * Acquire additional reference to the given object. This function is used to
- * attain additional reference. To acquire initial reference use
- * lu_object_find().
- */
-static inline void lu_object_get(struct lu_object *o)
-{
- LASSERT(o->lo_header->loh_ref > 0);
- spin_lock(&o->lo_dev->ld_site->ls_guard);
- o->lo_header->loh_ref ++;
- spin_unlock(&o->lo_dev->ld_site->ls_guard);
-}
-
-/*
- * Return true of object will not be cached after last reference to it is
- * released.
- */
-static inline int lu_object_is_dying(struct lu_object_header *h)
-{
- return test_bit(LU_OBJECT_HEARD_BANSHEE, &h->loh_flags);
-}
-
-/*
- * Decrease reference counter on object. If last reference is freed, return
- * object to the cache, unless lu_object_is_dying(o) holds. In the latter
- * case, free object immediately.
- */
-void lu_object_put(struct lu_context *ctxt, struct lu_object *o);
-
-/*
- * Free @nr objects from the cold end of the site LRU list.
- */
-void lu_site_purge(struct lu_context *ctx, struct lu_site *s, int nr);
-
-/*
- * Search cache for an object with the fid @f. If such object is found, return
- * it. Otherwise, create new object, insert it into cache and return it. In
- * any case, additional reference is acquired on the returned object.
- */
-struct lu_object *lu_object_find(struct lu_context *ctxt,
- struct lu_site *s, const struct lu_fid *f);
-
-/*
- * Helpers.
- */
-
-/*
- * First (topmost) sub-object of given compound object
- */
-static inline struct lu_object *lu_object_top(struct lu_object_header *h)
-{
- LASSERT(!list_empty(&h->loh_layers));
- return container_of0(h->loh_layers.next, struct lu_object, lo_linkage);
-}
-
-/*
- * Next sub-object in the layering
- */
-static inline struct lu_object *lu_object_next(const struct lu_object *o)
-{
- return container_of0(o->lo_linkage.next, struct lu_object, lo_linkage);
-}
-
-/*
- * Pointer to the fid of this object.
- */
-static inline const struct lu_fid *lu_object_fid(const struct lu_object *o)
-{
- return &o->lo_header->loh_fid;
-}
-
-/*
- * return device operations vector for this object
- */
-static inline struct lu_device_operations *
-lu_object_ops(const struct lu_object *o)
-{
- return o->lo_dev->ld_ops;
-}
-
-/*
- * Given a compound object, find its slice, corresponding to the device type
- * @dtype.
- */
-struct lu_object *lu_object_locate(struct lu_object_header *h,
- struct lu_device_type *dtype);
-
-/*
- * Print human readable representation of the @o to the @f.
- */
-int lu_object_print(struct lu_context *ctxt,
- struct seq_file *f, const struct lu_object *o);
-
-/*
- * Returns true iff object @o exists on the stable storage.
- */
-static inline int lu_object_exists(struct lu_context *ctx, struct lu_object *o)
-{
- return o->lo_ops->loo_object_exists(ctx, o);
-}
-
-/*
- * lu_context. Execution context for lu_object methods. Currently associated
- * with thread.
- *
- * All lu_object methods, except device and device type methods (called during
- * system initialization and shutdown) are executed "within" some
- * lu_context. This means, that pointer to some "current" lu_context is passed
- * as an argument to all methods.
- *
- * All service ptlrpc threads create lu_context as part of their
- * initialization. It is possible to create "stand-alone" context for other
- * execution environments (like system calls).
- *
- * lu_object methods mainly use lu_context through lu_context_key interface
- * that allows each layer to associate arbitrary pieces of data with each
- * context (see pthread_key_create(3) for similar interface).
- *
- */
-struct lu_context {
- /*
- * Theoretically we'd want to use lu_objects and lu_contexts on the
- * client side too. On the other hand, we don't want to allocate
- * values of server-side keys for the client contexts and vice versa.
- *
- * To achieve this, set of tags in introduced. Contexts and keys are
- * marked with tags. Key value are created only for context whose set
- * of tags has non-empty intersection with one for key. NOT YET
- * IMPLEMENTED.
- */
- __u32 lc_tags;
- /*
- * Pointer to the home service thread. NULL for other execution
- * contexts.
- */
- struct ptlrpc_thread *lc_thread;
- /*
- * Pointer to an array with key values. Internal implementation
- * detail.
- */
- void **lc_value;
-};
-
-/*
- * lu_context_key interface. Similar to pthread_key.
- */
-
-
-/*
- * Key. Represents per-context value slot.
- */
-struct lu_context_key {
- /*
- * Value constructor. This is called when new value is created for a
- * context. Returns pointer to new value of error pointer.
- */
- void *(*lct_init)(struct lu_context *ctx);
- /*
- * Value destructor. Called when context with previously allocated
- * value of this slot is destroyed. @data is a value that was returned
- * by a matching call to ->lct_init().
- */
- void (*lct_fini)(struct lu_context *ctx, void *data);
- /*
- * Internal implementation detail: index within ->lc_value[] reserved
- * for this key.
- */
- int lct_index;
- /*
- * Internal implementation detail: number of values created for this
- * key.
- */
- unsigned lct_used;
-};
-
-/*
- * Register new key.
- */
-int lu_context_key_register(struct lu_context_key *key);
-/*
- * Deregister key.
- */
-void lu_context_key_degister(struct lu_context_key *key);
-/*
- * Return value associated with key @key in context @ctx.
- */
-void *lu_context_key_get(struct lu_context *ctx, struct lu_context_key *key);
-
-/*
- * Initialize context data-structure. Create values for all keys.
- */
-int lu_context_init(struct lu_context *ctx);
-/*
- * Finalize context data-structure. Destroy key values.
- */
-void lu_context_fini(struct lu_context *ctx);
-
-/*
- * Called before entering context.
- */
-void lu_context_enter(struct lu_context *ctx);
-/*
- * Called after exiting from @ctx
- */
-void lu_context_exit(struct lu_context *ctx);
-
-
-#endif /* __LUSTRE_LU_OBJECT_H */
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * Extention of lu_object.h for metadata objects
- *
- * Copyright (C) 2006 Cluster File Systems, Inc.
- *
- * This file is part of Lustre, http://www.lustre.org.
- *
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * Lustre is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#ifndef _LUSTRE_MD_OBJECT_H
-#define _LUSTRE_MD_OBJECT_H
-
-/*
- * Sub-class of lu_object with methods common for "meta-data" objects in MDT
- * stack.
- *
- * Meta-data objects implement namespace operations: you can link, unlink
- * them, and treat them as directories.
- *
- * Examples: mdt, cmm, and mdt are implementations of md interface.
- */
-
-
-/*
- * super-class definitions.
- */
-#include <lu_object.h>
-
-struct md_device;
-struct md_device_operations;
-struct md_object;
-
-/*
- * Operations implemented for each md object (both directory and leaf).
- */
-struct md_object_operations {
- int (*moo_attr_get)(struct lu_context *ctxt, struct md_object *dt,
- struct lu_attr *attr);
- int (*moo_attr_set)(struct lu_context *ctxt, struct md_object *dt,
- struct lu_attr *attr);
-
- int (*moo_xattr_get)(struct lu_context *ctxt, struct md_object *obj,
- void *buf, int buf_len, const char *name);
-
- int (*moo_xattr_set)(struct lu_context *ctxt, struct md_object *obj,
- void *buf, int buf_len, const char *name);
- /* part of cross-ref operation */
- int (*moo_object_create)(struct lu_context *,
- struct md_object *, struct lu_attr *);
- int (*moo_ref_add)(struct lu_context *, struct md_object *);
- int (*moo_ref_del)(struct lu_context *, struct md_object *);
- int (*moo_open)(struct lu_context *, struct md_object *);
- int (*moo_close)(struct lu_context *, struct md_object *);
-};
-
-/*
- * Operations implemented for each directory object.
- */
-struct md_dir_operations {
- int (*mdo_lookup)(struct lu_context *, struct md_object *,
- const char *, struct lu_fid *);
-
- int (*mdo_mkdir)(struct lu_context *, struct lu_attr *,
- struct md_object *, const char *,
- struct md_object *);
-
- int (*mdo_rename)(struct lu_context *ctxt, struct md_object *spobj,
- struct md_object *tpobj, struct md_object *sobj,
- const char *sname, struct md_object *tobj,
- const char *tname);
-
- int (*mdo_link)(struct lu_context *ctxt, struct md_object *tobj,
- struct md_object *sobj, const char *name);
-
- /* partial ops for cross-ref case */
- int (*mdo_name_insert)(struct lu_context *, struct md_object *,
- const char *, const struct lu_fid *,
- struct lu_attr *);
- int (*mdo_name_remove)(struct lu_context *, struct md_object *,
- const char *, struct lu_attr *);
-};
-
-struct md_device_operations {
- /* method for getting/setting device wide back stored config data, like
- * last used meta-sequence, etc. */
- int (*mdo_config) (struct lu_context *ctx,
- struct md_device *m, const char *name,
- void *buf, int size, int mode);
-
- /* meta-data device related handlers. */
- int (*mdo_root_get)(struct lu_context *ctx,
- struct md_device *m, struct lu_fid *f);
- int (*mdo_statfs)(struct lu_context *ctx,
- struct md_device *m, struct kstatfs *sfs);
-
-};
-
-struct md_device {
- struct lu_device md_lu_dev;
- struct md_device_operations *md_ops;
-};
-
-struct md_object {
- struct lu_object mo_lu;
- struct md_object_operations *mo_ops;
- struct md_dir_operations *mo_dir_ops;
-};
-
-static inline int lu_device_is_md(const struct lu_device *d)
-{
- return ergo(d != NULL, d->ld_type->ldt_tags & LU_DEVICE_MD);
-}
-
-static inline struct md_device *lu2md_dev(const struct lu_device *d)
-{
- LASSERT(lu_device_is_md(d));
- return container_of0(d, struct md_device, md_lu_dev);
-}
-
-static inline struct lu_device *md2lu_dev(struct md_device *d)
-{
- return &d->md_lu_dev;
-}
-
-static inline struct md_object *lu2md(const struct lu_object *o)
-{
- LASSERT(lu_device_is_md(o->lo_dev));
- return container_of0(o, struct md_object, mo_lu);
-}
-
-static inline struct md_object *md_object_next(const struct md_object *obj)
-{
- return lu2md(lu_object_next(&obj->mo_lu));
-}
-
-static inline struct md_device *md_device_get(const struct md_object *o)
-{
- LASSERT(lu_device_is_md(o->mo_lu.lo_dev));
- return container_of0(o->mo_lu.lo_dev, struct md_device, md_lu_dev);
-}
-
-static inline int md_device_init(struct md_device *md, struct lu_device_type *t)
-{
- return lu_device_init(&md->md_lu_dev, t);
-}
-
-static inline void md_device_fini(struct md_device *md)
-{
- lu_device_fini(&md->md_lu_dev);
-}
-
-/* md operations */
-static inline int mo_attr_get(struct lu_context *cx, struct md_object *m,
- struct lu_attr *at)
-{
- return m->mo_ops->moo_attr_get(cx, m, at);
-}
-
-static inline int mo_object_create(struct lu_context *cx, struct md_object *m,
- struct lu_attr *at)
-{
- return m->mo_ops->moo_object_create(cx, m, at);
-}
-
-static inline int mdo_lookup(struct lu_context *cx, struct md_object *p,
- const char *name, struct lu_fid *f)
-{
- return p->mo_dir_ops->mdo_lookup(cx, p, name, f);
-}
-
-static inline int mdo_mkdir(struct lu_context *cx, struct lu_attr *at,
- struct md_object *p, const char *name,
- struct md_object *c)
-{
- return p->mo_dir_ops->mdo_mkdir(cx, at, p, name, c);
-}
-
-static inline int mdo_name_insert(struct lu_context *cx, struct md_object *p,
- const char *name, const struct lu_fid *f,
- struct lu_attr *at)
-{
- return p->mo_dir_ops->mdo_name_insert(cx, p, name, f, at);
-}
-
-#endif /* _LINUX_MD_OBJECT_H */
git://git.whamcloud.com / fs / lustre-release.git / commitdiff