681 lines
20 KiB
C
681 lines
20 KiB
C
/*
|
|
* GPL HEADER START
|
|
*
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 only,
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program 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 version 2 for more details (a copy is included
|
|
* in the LICENSE file that accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* version 2 along with this program; If not, see
|
|
* http://www.gnu.org/licenses/gpl-2.0.html
|
|
*
|
|
* GPL HEADER END
|
|
*/
|
|
/*
|
|
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
|
|
* Use is subject to license terms.
|
|
*
|
|
* Copyright (c) 2012, 2015, Intel Corporation.
|
|
*/
|
|
/*
|
|
* This file is part of Lustre, http://www.lustre.org/
|
|
* Lustre is a trademark of Sun Microsystems, Inc.
|
|
*/
|
|
/*
|
|
* This file is part of Lustre, http://www.lustre.org/
|
|
* Lustre is a trademark of Sun Microsystems, Inc.
|
|
*
|
|
* Internal interfaces of OSC layer.
|
|
*
|
|
* Author: Nikita Danilov <nikita.danilov@sun.com>
|
|
* Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
|
|
*/
|
|
|
|
#ifndef OSC_CL_INTERNAL_H
|
|
#define OSC_CL_INTERNAL_H
|
|
|
|
#include "../../include/linux/libcfs/libcfs.h"
|
|
|
|
#include "../include/obd.h"
|
|
/* osc_build_res_name() */
|
|
#include "../include/cl_object.h"
|
|
#include "osc_internal.h"
|
|
|
|
/** \defgroup osc osc
|
|
* @{
|
|
*/
|
|
|
|
struct osc_extent;
|
|
|
|
/**
|
|
* State maintained by osc layer for each IO context.
|
|
*/
|
|
struct osc_io {
|
|
/** super class */
|
|
struct cl_io_slice oi_cl;
|
|
/** true if this io is lockless. */
|
|
unsigned int oi_lockless;
|
|
/** how many LRU pages are reserved for this IO */
|
|
unsigned long oi_lru_reserved;
|
|
|
|
/** active extents, we know how many bytes is going to be written,
|
|
* so having an active extent will prevent it from being fragmented
|
|
*/
|
|
struct osc_extent *oi_active;
|
|
/** partially truncated extent, we need to hold this extent to prevent
|
|
* page writeback from happening.
|
|
*/
|
|
struct osc_extent *oi_trunc;
|
|
|
|
/** write osc_lock for this IO, used by osc_extent_find(). */
|
|
struct osc_lock *oi_write_osclock;
|
|
struct obdo oi_oa;
|
|
struct osc_async_cbargs {
|
|
bool opc_rpc_sent;
|
|
int opc_rc;
|
|
struct completion opc_sync;
|
|
} oi_cbarg;
|
|
};
|
|
|
|
/**
|
|
* State maintained by osc layer for the duration of a system call.
|
|
*/
|
|
struct osc_session {
|
|
struct osc_io os_io;
|
|
};
|
|
|
|
#define OTI_PVEC_SIZE 256
|
|
struct osc_thread_info {
|
|
struct ldlm_res_id oti_resname;
|
|
union ldlm_policy_data oti_policy;
|
|
struct cl_lock_descr oti_descr;
|
|
struct cl_attr oti_attr;
|
|
struct lustre_handle oti_handle;
|
|
struct cl_page_list oti_plist;
|
|
struct cl_io oti_io;
|
|
void *oti_pvec[OTI_PVEC_SIZE];
|
|
/**
|
|
* Fields used by cl_lock_discard_pages().
|
|
*/
|
|
pgoff_t oti_next_index;
|
|
pgoff_t oti_fn_index; /* first non-overlapped index */
|
|
struct cl_sync_io oti_anchor;
|
|
struct cl_req_attr oti_req_attr;
|
|
};
|
|
|
|
struct osc_object {
|
|
struct cl_object oo_cl;
|
|
struct lov_oinfo *oo_oinfo;
|
|
/**
|
|
* True if locking against this stripe got -EUSERS.
|
|
*/
|
|
int oo_contended;
|
|
unsigned long oo_contention_time;
|
|
/**
|
|
* used by the osc to keep track of what objects to build into rpcs.
|
|
* Protected by client_obd->cli_loi_list_lock.
|
|
*/
|
|
struct list_head oo_ready_item;
|
|
struct list_head oo_hp_ready_item;
|
|
struct list_head oo_write_item;
|
|
struct list_head oo_read_item;
|
|
|
|
/**
|
|
* extent is a red black tree to manage (async) dirty pages.
|
|
*/
|
|
struct rb_root oo_root;
|
|
/**
|
|
* Manage write(dirty) extents.
|
|
*/
|
|
struct list_head oo_hp_exts; /* list of hp extents */
|
|
struct list_head oo_urgent_exts; /* list of writeback extents */
|
|
struct list_head oo_rpc_exts;
|
|
|
|
struct list_head oo_reading_exts;
|
|
|
|
atomic_t oo_nr_reads;
|
|
atomic_t oo_nr_writes;
|
|
|
|
/** Protect extent tree. Will be used to protect
|
|
* oo_{read|write}_pages soon.
|
|
*/
|
|
spinlock_t oo_lock;
|
|
|
|
/**
|
|
* Radix tree for caching pages
|
|
*/
|
|
struct radix_tree_root oo_tree;
|
|
spinlock_t oo_tree_lock;
|
|
unsigned long oo_npages;
|
|
|
|
/* Protect osc_lock this osc_object has */
|
|
spinlock_t oo_ol_spin;
|
|
struct list_head oo_ol_list;
|
|
|
|
/** number of active IOs of this object */
|
|
atomic_t oo_nr_ios;
|
|
wait_queue_head_t oo_io_waitq;
|
|
};
|
|
|
|
static inline void osc_object_lock(struct osc_object *obj)
|
|
{
|
|
spin_lock(&obj->oo_lock);
|
|
}
|
|
|
|
static inline int osc_object_trylock(struct osc_object *obj)
|
|
{
|
|
return spin_trylock(&obj->oo_lock);
|
|
}
|
|
|
|
static inline void osc_object_unlock(struct osc_object *obj)
|
|
{
|
|
spin_unlock(&obj->oo_lock);
|
|
}
|
|
|
|
static inline int osc_object_is_locked(struct osc_object *obj)
|
|
{
|
|
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
|
|
return spin_is_locked(&obj->oo_lock);
|
|
#else
|
|
/*
|
|
* It is not perfect to return true all the time.
|
|
* But since this function is only used for assertion
|
|
* and checking, it seems OK.
|
|
*/
|
|
return 1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Lock "micro-states" for osc layer.
|
|
*/
|
|
enum osc_lock_state {
|
|
OLS_NEW,
|
|
OLS_ENQUEUED,
|
|
OLS_UPCALL_RECEIVED,
|
|
OLS_GRANTED,
|
|
OLS_CANCELLED
|
|
};
|
|
|
|
/**
|
|
* osc-private state of cl_lock.
|
|
*
|
|
* Interaction with DLM.
|
|
*
|
|
* Once receive upcall is invoked, osc_lock remembers a handle of DLM lock in
|
|
* osc_lock::ols_handle and a pointer to that lock in osc_lock::ols_dlmlock.
|
|
*
|
|
* This pointer is protected through a reference, acquired by
|
|
* osc_lock_upcall0(). Also, an additional reference is acquired by
|
|
* ldlm_lock_addref() call protecting the lock from cancellation, until
|
|
* osc_lock_unuse() releases it.
|
|
*
|
|
* Below is a description of how lock references are acquired and released
|
|
* inside of DLM.
|
|
*
|
|
* - When new lock is created and enqueued to the server (ldlm_cli_enqueue())
|
|
* - ldlm_lock_create()
|
|
* - ldlm_lock_new(): initializes a lock with 2 references. One for
|
|
* the caller (released when reply from the server is received, or on
|
|
* error), and another for the hash table.
|
|
* - ldlm_lock_addref_internal(): protects the lock from cancellation.
|
|
*
|
|
* - When reply is received from the server (osc_enqueue_interpret())
|
|
* - ldlm_cli_enqueue_fini()
|
|
* - LDLM_LOCK_PUT(): releases caller reference acquired by
|
|
* ldlm_lock_new().
|
|
* - if (rc != 0)
|
|
* ldlm_lock_decref(): error case: matches ldlm_cli_enqueue().
|
|
* - ldlm_lock_decref(): for async locks, matches ldlm_cli_enqueue().
|
|
*
|
|
* - When lock is being cancelled (ldlm_lock_cancel())
|
|
* - ldlm_lock_destroy()
|
|
* - LDLM_LOCK_PUT(): releases hash-table reference acquired by
|
|
* ldlm_lock_new().
|
|
*
|
|
* osc_lock is detached from ldlm_lock by osc_lock_detach() that is called
|
|
* either when lock is cancelled (osc_lock_blocking()), or when locks is
|
|
* deleted without cancellation (e.g., from cl_locks_prune()). In the latter
|
|
* case ldlm lock remains in memory, and can be re-attached to osc_lock in the
|
|
* future.
|
|
*/
|
|
struct osc_lock {
|
|
struct cl_lock_slice ols_cl;
|
|
/** Internal lock to protect states, etc. */
|
|
spinlock_t ols_lock;
|
|
/** Owner sleeps on this channel for state change */
|
|
struct cl_sync_io *ols_owner;
|
|
/** waiting list for this lock to be cancelled */
|
|
struct list_head ols_waiting_list;
|
|
/** wait entry of ols_waiting_list */
|
|
struct list_head ols_wait_entry;
|
|
/** list entry for osc_object::oo_ol_list */
|
|
struct list_head ols_nextlock_oscobj;
|
|
|
|
/** underlying DLM lock */
|
|
struct ldlm_lock *ols_dlmlock;
|
|
/** DLM flags with which osc_lock::ols_lock was enqueued */
|
|
__u64 ols_flags;
|
|
/** osc_lock::ols_lock handle */
|
|
struct lustre_handle ols_handle;
|
|
struct ldlm_enqueue_info ols_einfo;
|
|
enum osc_lock_state ols_state;
|
|
/** lock value block */
|
|
struct ost_lvb ols_lvb;
|
|
|
|
/**
|
|
* true, if ldlm_lock_addref() was called against
|
|
* osc_lock::ols_lock. This is used for sanity checking.
|
|
*
|
|
* \see osc_lock::ols_has_ref
|
|
*/
|
|
unsigned ols_hold :1,
|
|
/**
|
|
* this is much like osc_lock::ols_hold, except that this bit is
|
|
* cleared _after_ reference in released in osc_lock_unuse(). This
|
|
* fine distinction is needed because:
|
|
*
|
|
* - if ldlm lock still has a reference, osc_ast_data_get() needs
|
|
* to return associated cl_lock (so that a flag is needed that is
|
|
* cleared after ldlm_lock_decref() returned), and
|
|
*
|
|
* - ldlm_lock_decref() can invoke blocking ast (for a
|
|
* LDLM_FL_CBPENDING lock), and osc_lock functions like
|
|
* osc_lock_cancel() called from there need to know whether to
|
|
* release lock reference (so that a flag is needed that is
|
|
* cleared before ldlm_lock_decref() is called).
|
|
*/
|
|
ols_has_ref:1,
|
|
/**
|
|
* inherit the lockless attribute from top level cl_io.
|
|
* If true, osc_lock_enqueue is able to tolerate the -EUSERS error.
|
|
*/
|
|
ols_locklessable:1,
|
|
/**
|
|
* if set, the osc_lock is a glimpse lock. For glimpse locks, we treat
|
|
* the EVAVAIL error as tolerable, this will make upper logic happy
|
|
* to wait all glimpse locks to each OSTs to be completed.
|
|
* Glimpse lock converts to normal lock if the server lock is
|
|
* granted.
|
|
* Glimpse lock should be destroyed immediately after use.
|
|
*/
|
|
ols_glimpse:1,
|
|
/**
|
|
* For async glimpse lock.
|
|
*/
|
|
ols_agl:1;
|
|
};
|
|
|
|
/**
|
|
* Page state private for osc layer.
|
|
*/
|
|
struct osc_page {
|
|
struct cl_page_slice ops_cl;
|
|
/**
|
|
* Page queues used by osc to detect when RPC can be formed.
|
|
*/
|
|
struct osc_async_page ops_oap;
|
|
/**
|
|
* An offset within page from which next transfer starts. This is used
|
|
* by cl_page_clip() to submit partial page transfers.
|
|
*/
|
|
int ops_from;
|
|
/**
|
|
* An offset within page at which next transfer ends.
|
|
*
|
|
* \see osc_page::ops_from.
|
|
*/
|
|
int ops_to;
|
|
/**
|
|
* Boolean, true iff page is under transfer. Used for sanity checking.
|
|
*/
|
|
unsigned ops_transfer_pinned:1,
|
|
/**
|
|
* in LRU?
|
|
*/
|
|
ops_in_lru:1,
|
|
/**
|
|
* Set if the page must be transferred with OBD_BRW_SRVLOCK.
|
|
*/
|
|
ops_srvlock:1;
|
|
/**
|
|
* lru page list. See osc_lru_{del|use}() in osc_page.c for usage.
|
|
*/
|
|
struct list_head ops_lru;
|
|
/**
|
|
* Submit time - the time when the page is starting RPC. For debugging.
|
|
*/
|
|
unsigned long ops_submit_time;
|
|
};
|
|
|
|
extern struct kmem_cache *osc_lock_kmem;
|
|
extern struct kmem_cache *osc_object_kmem;
|
|
extern struct kmem_cache *osc_thread_kmem;
|
|
extern struct kmem_cache *osc_session_kmem;
|
|
extern struct kmem_cache *osc_extent_kmem;
|
|
|
|
extern struct lu_device_type osc_device_type;
|
|
extern struct lu_context_key osc_key;
|
|
extern struct lu_context_key osc_session_key;
|
|
|
|
#define OSC_FLAGS (ASYNC_URGENT | ASYNC_READY)
|
|
|
|
int osc_lock_init(const struct lu_env *env,
|
|
struct cl_object *obj, struct cl_lock *lock,
|
|
const struct cl_io *io);
|
|
int osc_io_init(const struct lu_env *env,
|
|
struct cl_object *obj, struct cl_io *io);
|
|
struct lu_object *osc_object_alloc(const struct lu_env *env,
|
|
const struct lu_object_header *hdr,
|
|
struct lu_device *dev);
|
|
int osc_page_init(const struct lu_env *env, struct cl_object *obj,
|
|
struct cl_page *page, pgoff_t ind);
|
|
|
|
void osc_index2policy(union ldlm_policy_data *policy,
|
|
const struct cl_object *obj,
|
|
pgoff_t start, pgoff_t end);
|
|
int osc_lvb_print(const struct lu_env *env, void *cookie,
|
|
lu_printer_t p, const struct ost_lvb *lvb);
|
|
|
|
void osc_lru_add_batch(struct client_obd *cli, struct list_head *list);
|
|
void osc_page_submit(const struct lu_env *env, struct osc_page *opg,
|
|
enum cl_req_type crt, int brw_flags);
|
|
int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops);
|
|
int osc_set_async_flags(struct osc_object *obj, struct osc_page *opg,
|
|
u32 async_flags);
|
|
int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
|
|
struct page *page, loff_t offset);
|
|
int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
|
|
struct osc_page *ops);
|
|
int osc_page_cache_add(const struct lu_env *env,
|
|
const struct cl_page_slice *slice, struct cl_io *io);
|
|
int osc_teardown_async_page(const struct lu_env *env, struct osc_object *obj,
|
|
struct osc_page *ops);
|
|
int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
|
|
struct osc_page *ops);
|
|
int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
|
|
struct list_head *list, int cmd, int brw_flags);
|
|
int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
|
|
u64 size, struct osc_extent **extp);
|
|
void osc_cache_truncate_end(const struct lu_env *env, struct osc_extent *ext);
|
|
int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
|
|
pgoff_t start, pgoff_t end, int hp, int discard);
|
|
int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
|
|
pgoff_t start, pgoff_t end);
|
|
void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_object *osc);
|
|
int lru_queue_work(const struct lu_env *env, void *data);
|
|
|
|
void osc_object_set_contended(struct osc_object *obj);
|
|
void osc_object_clear_contended(struct osc_object *obj);
|
|
int osc_object_is_contended(struct osc_object *obj);
|
|
|
|
int osc_lock_is_lockless(const struct osc_lock *olck);
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* Accessors.
|
|
*
|
|
*/
|
|
|
|
static inline struct osc_thread_info *osc_env_info(const struct lu_env *env)
|
|
{
|
|
struct osc_thread_info *info;
|
|
|
|
info = lu_context_key_get(&env->le_ctx, &osc_key);
|
|
LASSERT(info);
|
|
return info;
|
|
}
|
|
|
|
static inline struct osc_session *osc_env_session(const struct lu_env *env)
|
|
{
|
|
struct osc_session *ses;
|
|
|
|
ses = lu_context_key_get(env->le_ses, &osc_session_key);
|
|
LASSERT(ses);
|
|
return ses;
|
|
}
|
|
|
|
static inline struct osc_io *osc_env_io(const struct lu_env *env)
|
|
{
|
|
return &osc_env_session(env)->os_io;
|
|
}
|
|
|
|
static inline int osc_is_object(const struct lu_object *obj)
|
|
{
|
|
return obj->lo_dev->ld_type == &osc_device_type;
|
|
}
|
|
|
|
static inline struct osc_device *lu2osc_dev(const struct lu_device *d)
|
|
{
|
|
LINVRNT(d->ld_type == &osc_device_type);
|
|
return container_of0(d, struct osc_device, od_cl.cd_lu_dev);
|
|
}
|
|
|
|
static inline struct obd_export *osc_export(const struct osc_object *obj)
|
|
{
|
|
return lu2osc_dev(obj->oo_cl.co_lu.lo_dev)->od_exp;
|
|
}
|
|
|
|
static inline struct client_obd *osc_cli(const struct osc_object *obj)
|
|
{
|
|
return &osc_export(obj)->exp_obd->u.cli;
|
|
}
|
|
|
|
static inline struct osc_object *cl2osc(const struct cl_object *obj)
|
|
{
|
|
LINVRNT(osc_is_object(&obj->co_lu));
|
|
return container_of0(obj, struct osc_object, oo_cl);
|
|
}
|
|
|
|
static inline struct cl_object *osc2cl(const struct osc_object *obj)
|
|
{
|
|
return (struct cl_object *)&obj->oo_cl;
|
|
}
|
|
|
|
static inline enum ldlm_mode osc_cl_lock2ldlm(enum cl_lock_mode mode)
|
|
{
|
|
LASSERT(mode == CLM_READ || mode == CLM_WRITE || mode == CLM_GROUP);
|
|
if (mode == CLM_READ)
|
|
return LCK_PR;
|
|
else if (mode == CLM_WRITE)
|
|
return LCK_PW;
|
|
else
|
|
return LCK_GROUP;
|
|
}
|
|
|
|
static inline enum cl_lock_mode osc_ldlm2cl_lock(enum ldlm_mode mode)
|
|
{
|
|
LASSERT(mode == LCK_PR || mode == LCK_PW || mode == LCK_GROUP);
|
|
if (mode == LCK_PR)
|
|
return CLM_READ;
|
|
else if (mode == LCK_PW)
|
|
return CLM_WRITE;
|
|
else
|
|
return CLM_GROUP;
|
|
}
|
|
|
|
static inline struct osc_page *cl2osc_page(const struct cl_page_slice *slice)
|
|
{
|
|
LINVRNT(osc_is_object(&slice->cpl_obj->co_lu));
|
|
return container_of0(slice, struct osc_page, ops_cl);
|
|
}
|
|
|
|
static inline struct osc_page *oap2osc(struct osc_async_page *oap)
|
|
{
|
|
return container_of0(oap, struct osc_page, ops_oap);
|
|
}
|
|
|
|
static inline pgoff_t osc_index(struct osc_page *opg)
|
|
{
|
|
return opg->ops_cl.cpl_index;
|
|
}
|
|
|
|
static inline struct cl_page *oap2cl_page(struct osc_async_page *oap)
|
|
{
|
|
return oap2osc(oap)->ops_cl.cpl_page;
|
|
}
|
|
|
|
static inline struct osc_page *oap2osc_page(struct osc_async_page *oap)
|
|
{
|
|
return (struct osc_page *)container_of(oap, struct osc_page, ops_oap);
|
|
}
|
|
|
|
static inline struct osc_page *
|
|
osc_cl_page_osc(struct cl_page *page, struct osc_object *osc)
|
|
{
|
|
const struct cl_page_slice *slice;
|
|
|
|
LASSERT(osc);
|
|
slice = cl_object_page_slice(&osc->oo_cl, page);
|
|
return cl2osc_page(slice);
|
|
}
|
|
|
|
static inline struct osc_lock *cl2osc_lock(const struct cl_lock_slice *slice)
|
|
{
|
|
LINVRNT(osc_is_object(&slice->cls_obj->co_lu));
|
|
return container_of0(slice, struct osc_lock, ols_cl);
|
|
}
|
|
|
|
static inline struct osc_lock *osc_lock_at(const struct cl_lock *lock)
|
|
{
|
|
return cl2osc_lock(cl_lock_at(lock, &osc_device_type));
|
|
}
|
|
|
|
static inline int osc_io_srvlock(struct osc_io *oio)
|
|
{
|
|
return (oio->oi_lockless && !oio->oi_cl.cis_io->ci_no_srvlock);
|
|
}
|
|
|
|
enum osc_extent_state {
|
|
OES_INV = 0, /** extent is just initialized or destroyed */
|
|
OES_ACTIVE = 1, /** process is using this extent */
|
|
OES_CACHE = 2, /** extent is ready for IO */
|
|
OES_LOCKING = 3, /** locking page to prepare IO */
|
|
OES_LOCK_DONE = 4, /** locking finished, ready to send */
|
|
OES_RPC = 5, /** in RPC */
|
|
OES_TRUNC = 6, /** being truncated */
|
|
OES_STATE_MAX
|
|
};
|
|
|
|
/**
|
|
* osc_extent data to manage dirty pages.
|
|
* osc_extent has the following attributes:
|
|
* 1. all pages in the same must be in one RPC in write back;
|
|
* 2. # of pages must be less than max_pages_per_rpc - implied by 1;
|
|
* 3. must be covered by only 1 osc_lock;
|
|
* 4. exclusive. It's impossible to have overlapped osc_extent.
|
|
*
|
|
* The lifetime of an extent is from when the 1st page is dirtied to when
|
|
* all pages inside it are written out.
|
|
*
|
|
* LOCKING ORDER
|
|
* =============
|
|
* page lock -> cl_loi_list_lock -> object lock(osc_object::oo_lock)
|
|
*/
|
|
struct osc_extent {
|
|
/** red-black tree node */
|
|
struct rb_node oe_node;
|
|
/** osc_object of this extent */
|
|
struct osc_object *oe_obj;
|
|
/** refcount, removed from red-black tree if reaches zero. */
|
|
atomic_t oe_refc;
|
|
/** busy if non-zero */
|
|
atomic_t oe_users;
|
|
/** link list of osc_object's oo_{hp|urgent|locking}_exts. */
|
|
struct list_head oe_link;
|
|
/** state of this extent */
|
|
enum osc_extent_state oe_state;
|
|
/** flags for this extent. */
|
|
unsigned int oe_intree:1,
|
|
/** 0 is write, 1 is read */
|
|
oe_rw:1,
|
|
/** sync extent, queued by osc_queue_sync_pages() */
|
|
oe_sync:1,
|
|
/** set if this extent has partial, sync pages.
|
|
* Extents with partial page(s) can't merge with others in RPC
|
|
*/
|
|
oe_no_merge:1,
|
|
oe_srvlock:1,
|
|
oe_memalloc:1,
|
|
/** an ACTIVE extent is going to be truncated, so when this extent
|
|
* is released, it will turn into TRUNC state instead of CACHE.
|
|
*/
|
|
oe_trunc_pending:1,
|
|
/** this extent should be written asap and someone may wait for the
|
|
* write to finish. This bit is usually set along with urgent if
|
|
* the extent was CACHE state.
|
|
* fsync_wait extent can't be merged because new extent region may
|
|
* exceed fsync range.
|
|
*/
|
|
oe_fsync_wait:1,
|
|
/** covering lock is being canceled */
|
|
oe_hp:1,
|
|
/** this extent should be written back asap. set if one of pages is
|
|
* called by page WB daemon, or sync write or reading requests.
|
|
*/
|
|
oe_urgent:1;
|
|
/** how many grants allocated for this extent.
|
|
* Grant allocated for this extent. There is no grant allocated
|
|
* for reading extents and sync write extents.
|
|
*/
|
|
unsigned int oe_grants;
|
|
/** # of dirty pages in this extent */
|
|
unsigned int oe_nr_pages;
|
|
/** list of pending oap pages. Pages in this list are NOT sorted. */
|
|
struct list_head oe_pages;
|
|
/** Since an extent has to be written out in atomic, this is used to
|
|
* remember the next page need to be locked to write this extent out.
|
|
* Not used right now.
|
|
*/
|
|
struct osc_page *oe_next_page;
|
|
/** start and end index of this extent, include start and end
|
|
* themselves. Page offset here is the page index of osc_pages.
|
|
* oe_start is used as keyword for red-black tree.
|
|
*/
|
|
pgoff_t oe_start;
|
|
pgoff_t oe_end;
|
|
/** maximum ending index of this extent, this is limited by
|
|
* max_pages_per_rpc, lock extent and chunk size.
|
|
*/
|
|
pgoff_t oe_max_end;
|
|
/** waitqueue - for those who want to be notified if this extent's
|
|
* state has changed.
|
|
*/
|
|
wait_queue_head_t oe_waitq;
|
|
/** lock covering this extent */
|
|
struct ldlm_lock *oe_dlmlock;
|
|
/** terminator of this extent. Must be true if this extent is in IO. */
|
|
struct task_struct *oe_owner;
|
|
/** return value of writeback. If somebody is waiting for this extent,
|
|
* this value can be known by outside world.
|
|
*/
|
|
int oe_rc;
|
|
/** max pages per rpc when this extent was created */
|
|
unsigned int oe_mppr;
|
|
};
|
|
|
|
int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
|
|
int sent, int rc);
|
|
void osc_extent_release(const struct lu_env *env, struct osc_extent *ext);
|
|
|
|
int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
|
|
pgoff_t start, pgoff_t end, enum cl_lock_mode mode);
|
|
|
|
typedef int (*osc_page_gang_cbt)(const struct lu_env *, struct cl_io *,
|
|
struct osc_page *, void *);
|
|
int osc_page_gang_lookup(const struct lu_env *env, struct cl_io *io,
|
|
struct osc_object *osc, pgoff_t start, pgoff_t end,
|
|
osc_page_gang_cbt cb, void *cbdata);
|
|
/** @} osc */
|
|
|
|
#endif /* OSC_CL_INTERNAL_H */
|