2996 lines
80 KiB
C
2996 lines
80 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.sun.com/software/products/lustre/docs/GPLv2.pdf
|
|
*
|
|
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
* CA 95054 USA or visit www.sun.com if you need additional information or
|
|
* have any questions.
|
|
*
|
|
* 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.
|
|
*
|
|
* osc cache management.
|
|
*
|
|
* Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
|
|
*/
|
|
|
|
#define DEBUG_SUBSYSTEM S_OSC
|
|
|
|
#include "osc_cl_internal.h"
|
|
#include "osc_internal.h"
|
|
|
|
static int extent_debug; /* set it to be true for more debug */
|
|
|
|
static void osc_update_pending(struct osc_object *obj, int cmd, int delta);
|
|
static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
|
|
int state);
|
|
static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_async_page *oap, int sent, int rc);
|
|
static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
|
|
int cmd);
|
|
static int osc_refresh_count(const struct lu_env *env,
|
|
struct osc_async_page *oap, int cmd);
|
|
static int osc_io_unplug_async(const struct lu_env *env,
|
|
struct client_obd *cli, struct osc_object *osc);
|
|
static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
|
|
unsigned int lost_grant);
|
|
|
|
static void osc_extent_tree_dump0(int level, struct osc_object *obj,
|
|
const char *func, int line);
|
|
#define osc_extent_tree_dump(lvl, obj) \
|
|
osc_extent_tree_dump0(lvl, obj, __func__, __LINE__)
|
|
|
|
/** \addtogroup osc
|
|
* @{
|
|
*/
|
|
|
|
/* ------------------ osc extent ------------------ */
|
|
static inline char *ext_flags(struct osc_extent *ext, char *flags)
|
|
{
|
|
char *buf = flags;
|
|
*buf++ = ext->oe_rw ? 'r' : 'w';
|
|
if (ext->oe_intree)
|
|
*buf++ = 'i';
|
|
if (ext->oe_srvlock)
|
|
*buf++ = 's';
|
|
if (ext->oe_hp)
|
|
*buf++ = 'h';
|
|
if (ext->oe_urgent)
|
|
*buf++ = 'u';
|
|
if (ext->oe_memalloc)
|
|
*buf++ = 'm';
|
|
if (ext->oe_trunc_pending)
|
|
*buf++ = 't';
|
|
if (ext->oe_fsync_wait)
|
|
*buf++ = 'Y';
|
|
*buf = 0;
|
|
return flags;
|
|
}
|
|
|
|
static inline char list_empty_marker(struct list_head *list)
|
|
{
|
|
return list_empty(list) ? '-' : '+';
|
|
}
|
|
|
|
#define EXTSTR "[%lu -> %lu/%lu]"
|
|
#define EXTPARA(ext) (ext)->oe_start, (ext)->oe_end, (ext)->oe_max_end
|
|
static const char *oes_strings[] = {
|
|
"inv", "active", "cache", "locking", "lockdone", "rpc", "trunc", NULL };
|
|
|
|
#define OSC_EXTENT_DUMP(lvl, extent, fmt, ...) do { \
|
|
struct osc_extent *__ext = (extent); \
|
|
char __buf[16]; \
|
|
\
|
|
CDEBUG(lvl, \
|
|
"extent %p@{" EXTSTR ", " \
|
|
"[%d|%d|%c|%s|%s|%p], [%d|%d|%c|%c|%p|%u|%p]} " fmt, \
|
|
/* ----- extent part 0 ----- */ \
|
|
__ext, EXTPARA(__ext), \
|
|
/* ----- part 1 ----- */ \
|
|
atomic_read(&__ext->oe_refc), \
|
|
atomic_read(&__ext->oe_users), \
|
|
list_empty_marker(&__ext->oe_link), \
|
|
oes_strings[__ext->oe_state], ext_flags(__ext, __buf), \
|
|
__ext->oe_obj, \
|
|
/* ----- part 2 ----- */ \
|
|
__ext->oe_grants, __ext->oe_nr_pages, \
|
|
list_empty_marker(&__ext->oe_pages), \
|
|
waitqueue_active(&__ext->oe_waitq) ? '+' : '-', \
|
|
__ext->oe_osclock, __ext->oe_mppr, __ext->oe_owner, \
|
|
/* ----- part 4 ----- */ \
|
|
## __VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#undef EASSERTF
|
|
#define EASSERTF(expr, ext, fmt, args...) do { \
|
|
if (!(expr)) { \
|
|
OSC_EXTENT_DUMP(D_ERROR, (ext), fmt, ##args); \
|
|
osc_extent_tree_dump(D_ERROR, (ext)->oe_obj); \
|
|
LASSERT(expr); \
|
|
} \
|
|
} while (0)
|
|
|
|
#undef EASSERT
|
|
#define EASSERT(expr, ext) EASSERTF(expr, ext, "\n")
|
|
|
|
static inline struct osc_extent *rb_extent(struct rb_node *n)
|
|
{
|
|
if (!n)
|
|
return NULL;
|
|
|
|
return container_of(n, struct osc_extent, oe_node);
|
|
}
|
|
|
|
static inline struct osc_extent *next_extent(struct osc_extent *ext)
|
|
{
|
|
if (!ext)
|
|
return NULL;
|
|
|
|
LASSERT(ext->oe_intree);
|
|
return rb_extent(rb_next(&ext->oe_node));
|
|
}
|
|
|
|
static inline struct osc_extent *prev_extent(struct osc_extent *ext)
|
|
{
|
|
if (!ext)
|
|
return NULL;
|
|
|
|
LASSERT(ext->oe_intree);
|
|
return rb_extent(rb_prev(&ext->oe_node));
|
|
}
|
|
|
|
static inline struct osc_extent *first_extent(struct osc_object *obj)
|
|
{
|
|
return rb_extent(rb_first(&obj->oo_root));
|
|
}
|
|
|
|
/* object must be locked by caller. */
|
|
static int osc_extent_sanity_check0(struct osc_extent *ext,
|
|
const char *func, const int line)
|
|
{
|
|
struct osc_object *obj = ext->oe_obj;
|
|
struct osc_async_page *oap;
|
|
int page_count;
|
|
int rc = 0;
|
|
|
|
if (!osc_object_is_locked(obj)) {
|
|
rc = 9;
|
|
goto out;
|
|
}
|
|
|
|
if (ext->oe_state >= OES_STATE_MAX) {
|
|
rc = 10;
|
|
goto out;
|
|
}
|
|
|
|
if (atomic_read(&ext->oe_refc) <= 0) {
|
|
rc = 20;
|
|
goto out;
|
|
}
|
|
|
|
if (atomic_read(&ext->oe_refc) < atomic_read(&ext->oe_users)) {
|
|
rc = 30;
|
|
goto out;
|
|
}
|
|
|
|
switch (ext->oe_state) {
|
|
case OES_INV:
|
|
if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages))
|
|
rc = 35;
|
|
else
|
|
rc = 0;
|
|
goto out;
|
|
case OES_ACTIVE:
|
|
if (atomic_read(&ext->oe_users) == 0) {
|
|
rc = 40;
|
|
goto out;
|
|
}
|
|
if (ext->oe_hp) {
|
|
rc = 50;
|
|
goto out;
|
|
}
|
|
if (ext->oe_fsync_wait && !ext->oe_urgent) {
|
|
rc = 55;
|
|
goto out;
|
|
}
|
|
break;
|
|
case OES_CACHE:
|
|
if (ext->oe_grants == 0) {
|
|
rc = 60;
|
|
goto out;
|
|
}
|
|
if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp) {
|
|
rc = 65;
|
|
goto out;
|
|
}
|
|
default:
|
|
if (atomic_read(&ext->oe_users) > 0) {
|
|
rc = 70;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start) {
|
|
rc = 80;
|
|
goto out;
|
|
}
|
|
|
|
if (!ext->oe_osclock && ext->oe_grants > 0) {
|
|
rc = 90;
|
|
goto out;
|
|
}
|
|
|
|
if (ext->oe_osclock) {
|
|
struct cl_lock_descr *descr;
|
|
|
|
descr = &ext->oe_osclock->cll_descr;
|
|
if (!(descr->cld_start <= ext->oe_start &&
|
|
descr->cld_end >= ext->oe_max_end)) {
|
|
rc = 100;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (ext->oe_nr_pages > ext->oe_mppr) {
|
|
rc = 105;
|
|
goto out;
|
|
}
|
|
|
|
/* Do not verify page list if extent is in RPC. This is because an
|
|
* in-RPC extent is supposed to be exclusively accessible w/o lock.
|
|
*/
|
|
if (ext->oe_state > OES_CACHE) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (!extent_debug) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
page_count = 0;
|
|
list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
|
|
pgoff_t index = oap2cl_page(oap)->cp_index;
|
|
++page_count;
|
|
if (index > ext->oe_end || index < ext->oe_start) {
|
|
rc = 110;
|
|
goto out;
|
|
}
|
|
}
|
|
if (page_count != ext->oe_nr_pages) {
|
|
rc = 120;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (rc != 0)
|
|
OSC_EXTENT_DUMP(D_ERROR, ext,
|
|
"%s:%d sanity check %p failed with rc = %d\n",
|
|
func, line, ext, rc);
|
|
return rc;
|
|
}
|
|
|
|
#define sanity_check_nolock(ext) \
|
|
osc_extent_sanity_check0(ext, __func__, __LINE__)
|
|
|
|
#define sanity_check(ext) ({ \
|
|
int __res; \
|
|
osc_object_lock((ext)->oe_obj); \
|
|
__res = sanity_check_nolock(ext); \
|
|
osc_object_unlock((ext)->oe_obj); \
|
|
__res; \
|
|
})
|
|
|
|
/**
|
|
* sanity check - to make sure there is no overlapped extent in the tree.
|
|
*/
|
|
static int osc_extent_is_overlapped(struct osc_object *obj,
|
|
struct osc_extent *ext)
|
|
{
|
|
struct osc_extent *tmp;
|
|
|
|
LASSERT(osc_object_is_locked(obj));
|
|
|
|
if (!extent_debug)
|
|
return 0;
|
|
|
|
for (tmp = first_extent(obj); tmp; tmp = next_extent(tmp)) {
|
|
if (tmp == ext)
|
|
continue;
|
|
if (tmp->oe_end >= ext->oe_start &&
|
|
tmp->oe_start <= ext->oe_end)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void osc_extent_state_set(struct osc_extent *ext, int state)
|
|
{
|
|
LASSERT(osc_object_is_locked(ext->oe_obj));
|
|
LASSERT(state >= OES_INV && state < OES_STATE_MAX);
|
|
|
|
/* Never try to sanity check a state changing extent :-) */
|
|
/* LASSERT(sanity_check_nolock(ext) == 0); */
|
|
|
|
/* TODO: validate the state machine */
|
|
ext->oe_state = state;
|
|
wake_up_all(&ext->oe_waitq);
|
|
}
|
|
|
|
static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
|
|
{
|
|
struct osc_extent *ext;
|
|
|
|
ext = kmem_cache_zalloc(osc_extent_kmem, GFP_NOFS);
|
|
if (!ext)
|
|
return NULL;
|
|
|
|
RB_CLEAR_NODE(&ext->oe_node);
|
|
ext->oe_obj = obj;
|
|
atomic_set(&ext->oe_refc, 1);
|
|
atomic_set(&ext->oe_users, 0);
|
|
INIT_LIST_HEAD(&ext->oe_link);
|
|
ext->oe_state = OES_INV;
|
|
INIT_LIST_HEAD(&ext->oe_pages);
|
|
init_waitqueue_head(&ext->oe_waitq);
|
|
ext->oe_osclock = NULL;
|
|
|
|
return ext;
|
|
}
|
|
|
|
static void osc_extent_free(struct osc_extent *ext)
|
|
{
|
|
kmem_cache_free(osc_extent_kmem, ext);
|
|
}
|
|
|
|
static struct osc_extent *osc_extent_get(struct osc_extent *ext)
|
|
{
|
|
LASSERT(atomic_read(&ext->oe_refc) >= 0);
|
|
atomic_inc(&ext->oe_refc);
|
|
return ext;
|
|
}
|
|
|
|
static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
|
|
{
|
|
LASSERT(atomic_read(&ext->oe_refc) > 0);
|
|
if (atomic_dec_and_test(&ext->oe_refc)) {
|
|
LASSERT(list_empty(&ext->oe_link));
|
|
LASSERT(atomic_read(&ext->oe_users) == 0);
|
|
LASSERT(ext->oe_state == OES_INV);
|
|
LASSERT(!ext->oe_intree);
|
|
|
|
if (ext->oe_osclock) {
|
|
cl_lock_put(env, ext->oe_osclock);
|
|
ext->oe_osclock = NULL;
|
|
}
|
|
osc_extent_free(ext);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* osc_extent_put_trust() is a special version of osc_extent_put() when
|
|
* it's known that the caller is not the last user. This is to address the
|
|
* problem of lacking of lu_env ;-).
|
|
*/
|
|
static void osc_extent_put_trust(struct osc_extent *ext)
|
|
{
|
|
LASSERT(atomic_read(&ext->oe_refc) > 1);
|
|
LASSERT(osc_object_is_locked(ext->oe_obj));
|
|
atomic_dec(&ext->oe_refc);
|
|
}
|
|
|
|
/**
|
|
* Return the extent which includes pgoff @index, or return the greatest
|
|
* previous extent in the tree.
|
|
*/
|
|
static struct osc_extent *osc_extent_search(struct osc_object *obj,
|
|
pgoff_t index)
|
|
{
|
|
struct rb_node *n = obj->oo_root.rb_node;
|
|
struct osc_extent *tmp, *p = NULL;
|
|
|
|
LASSERT(osc_object_is_locked(obj));
|
|
while (n) {
|
|
tmp = rb_extent(n);
|
|
if (index < tmp->oe_start) {
|
|
n = n->rb_left;
|
|
} else if (index > tmp->oe_end) {
|
|
p = rb_extent(n);
|
|
n = n->rb_right;
|
|
} else {
|
|
return tmp;
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
/*
|
|
* Return the extent covering @index, otherwise return NULL.
|
|
* caller must have held object lock.
|
|
*/
|
|
static struct osc_extent *osc_extent_lookup(struct osc_object *obj,
|
|
pgoff_t index)
|
|
{
|
|
struct osc_extent *ext;
|
|
|
|
ext = osc_extent_search(obj, index);
|
|
if (ext && ext->oe_start <= index && index <= ext->oe_end)
|
|
return osc_extent_get(ext);
|
|
return NULL;
|
|
}
|
|
|
|
/* caller must have held object lock. */
|
|
static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext)
|
|
{
|
|
struct rb_node **n = &obj->oo_root.rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct osc_extent *tmp;
|
|
|
|
LASSERT(ext->oe_intree == 0);
|
|
LASSERT(ext->oe_obj == obj);
|
|
LASSERT(osc_object_is_locked(obj));
|
|
while (*n) {
|
|
tmp = rb_extent(*n);
|
|
parent = *n;
|
|
|
|
if (ext->oe_end < tmp->oe_start)
|
|
n = &(*n)->rb_left;
|
|
else if (ext->oe_start > tmp->oe_end)
|
|
n = &(*n)->rb_right;
|
|
else
|
|
EASSERTF(0, tmp, EXTSTR"\n", EXTPARA(ext));
|
|
}
|
|
rb_link_node(&ext->oe_node, parent, n);
|
|
rb_insert_color(&ext->oe_node, &obj->oo_root);
|
|
osc_extent_get(ext);
|
|
ext->oe_intree = 1;
|
|
}
|
|
|
|
/* caller must have held object lock. */
|
|
static void osc_extent_erase(struct osc_extent *ext)
|
|
{
|
|
struct osc_object *obj = ext->oe_obj;
|
|
|
|
LASSERT(osc_object_is_locked(obj));
|
|
if (ext->oe_intree) {
|
|
rb_erase(&ext->oe_node, &obj->oo_root);
|
|
ext->oe_intree = 0;
|
|
/* rbtree held a refcount */
|
|
osc_extent_put_trust(ext);
|
|
}
|
|
}
|
|
|
|
static struct osc_extent *osc_extent_hold(struct osc_extent *ext)
|
|
{
|
|
struct osc_object *obj = ext->oe_obj;
|
|
|
|
LASSERT(osc_object_is_locked(obj));
|
|
LASSERT(ext->oe_state == OES_ACTIVE || ext->oe_state == OES_CACHE);
|
|
if (ext->oe_state == OES_CACHE) {
|
|
osc_extent_state_set(ext, OES_ACTIVE);
|
|
osc_update_pending(obj, OBD_BRW_WRITE, -ext->oe_nr_pages);
|
|
}
|
|
atomic_inc(&ext->oe_users);
|
|
list_del_init(&ext->oe_link);
|
|
return osc_extent_get(ext);
|
|
}
|
|
|
|
static void __osc_extent_remove(struct osc_extent *ext)
|
|
{
|
|
LASSERT(osc_object_is_locked(ext->oe_obj));
|
|
LASSERT(list_empty(&ext->oe_pages));
|
|
osc_extent_erase(ext);
|
|
list_del_init(&ext->oe_link);
|
|
osc_extent_state_set(ext, OES_INV);
|
|
OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n");
|
|
}
|
|
|
|
static void osc_extent_remove(struct osc_extent *ext)
|
|
{
|
|
struct osc_object *obj = ext->oe_obj;
|
|
|
|
osc_object_lock(obj);
|
|
__osc_extent_remove(ext);
|
|
osc_object_unlock(obj);
|
|
}
|
|
|
|
/**
|
|
* This function is used to merge extents to get better performance. It checks
|
|
* if @cur and @victim are contiguous at chunk level.
|
|
*/
|
|
static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
|
|
struct osc_extent *victim)
|
|
{
|
|
struct osc_object *obj = cur->oe_obj;
|
|
pgoff_t chunk_start;
|
|
pgoff_t chunk_end;
|
|
int ppc_bits;
|
|
|
|
LASSERT(cur->oe_state == OES_CACHE);
|
|
LASSERT(osc_object_is_locked(obj));
|
|
if (!victim)
|
|
return -EINVAL;
|
|
|
|
if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait)
|
|
return -EBUSY;
|
|
|
|
if (cur->oe_max_end != victim->oe_max_end)
|
|
return -ERANGE;
|
|
|
|
LASSERT(cur->oe_osclock == victim->oe_osclock);
|
|
ppc_bits = osc_cli(obj)->cl_chunkbits - PAGE_SHIFT;
|
|
chunk_start = cur->oe_start >> ppc_bits;
|
|
chunk_end = cur->oe_end >> ppc_bits;
|
|
if (chunk_start != (victim->oe_end >> ppc_bits) + 1 &&
|
|
chunk_end + 1 != victim->oe_start >> ppc_bits)
|
|
return -ERANGE;
|
|
|
|
OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur);
|
|
|
|
cur->oe_start = min(cur->oe_start, victim->oe_start);
|
|
cur->oe_end = max(cur->oe_end, victim->oe_end);
|
|
cur->oe_grants += victim->oe_grants;
|
|
cur->oe_nr_pages += victim->oe_nr_pages;
|
|
/* only the following bits are needed to merge */
|
|
cur->oe_urgent |= victim->oe_urgent;
|
|
cur->oe_memalloc |= victim->oe_memalloc;
|
|
list_splice_init(&victim->oe_pages, &cur->oe_pages);
|
|
list_del_init(&victim->oe_link);
|
|
victim->oe_nr_pages = 0;
|
|
|
|
osc_extent_get(victim);
|
|
__osc_extent_remove(victim);
|
|
osc_extent_put(env, victim);
|
|
|
|
OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Drop user count of osc_extent, and unplug IO asynchronously.
|
|
*/
|
|
void osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
|
|
{
|
|
struct osc_object *obj = ext->oe_obj;
|
|
|
|
LASSERT(atomic_read(&ext->oe_users) > 0);
|
|
LASSERT(sanity_check(ext) == 0);
|
|
LASSERT(ext->oe_grants > 0);
|
|
|
|
if (atomic_dec_and_lock(&ext->oe_users, &obj->oo_lock)) {
|
|
LASSERT(ext->oe_state == OES_ACTIVE);
|
|
if (ext->oe_trunc_pending) {
|
|
/* a truncate process is waiting for this extent.
|
|
* This may happen due to a race, check
|
|
* osc_cache_truncate_start().
|
|
*/
|
|
osc_extent_state_set(ext, OES_TRUNC);
|
|
ext->oe_trunc_pending = 0;
|
|
} else {
|
|
osc_extent_state_set(ext, OES_CACHE);
|
|
osc_update_pending(obj, OBD_BRW_WRITE,
|
|
ext->oe_nr_pages);
|
|
|
|
/* try to merge the previous and next extent. */
|
|
osc_extent_merge(env, ext, prev_extent(ext));
|
|
osc_extent_merge(env, ext, next_extent(ext));
|
|
|
|
if (ext->oe_urgent)
|
|
list_move_tail(&ext->oe_link,
|
|
&obj->oo_urgent_exts);
|
|
}
|
|
osc_object_unlock(obj);
|
|
|
|
osc_io_unplug_async(env, osc_cli(obj), obj);
|
|
}
|
|
osc_extent_put(env, ext);
|
|
}
|
|
|
|
static inline int overlapped(struct osc_extent *ex1, struct osc_extent *ex2)
|
|
{
|
|
return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start);
|
|
}
|
|
|
|
/**
|
|
* Find or create an extent which includes @index, core function to manage
|
|
* extent tree.
|
|
*/
|
|
static struct osc_extent *osc_extent_find(const struct lu_env *env,
|
|
struct osc_object *obj, pgoff_t index,
|
|
int *grants)
|
|
|
|
{
|
|
struct client_obd *cli = osc_cli(obj);
|
|
struct cl_lock *lock;
|
|
struct osc_extent *cur;
|
|
struct osc_extent *ext;
|
|
struct osc_extent *conflict = NULL;
|
|
struct osc_extent *found = NULL;
|
|
pgoff_t chunk;
|
|
pgoff_t max_end;
|
|
int max_pages; /* max_pages_per_rpc */
|
|
int chunksize;
|
|
int ppc_bits; /* pages per chunk bits */
|
|
int chunk_mask;
|
|
int rc;
|
|
|
|
cur = osc_extent_alloc(obj);
|
|
if (!cur)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
lock = cl_lock_at_pgoff(env, osc2cl(obj), index, NULL, 1, 0);
|
|
LASSERT(lock->cll_descr.cld_mode >= CLM_WRITE);
|
|
|
|
LASSERT(cli->cl_chunkbits >= PAGE_SHIFT);
|
|
ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
|
|
chunk_mask = ~((1 << ppc_bits) - 1);
|
|
chunksize = 1 << cli->cl_chunkbits;
|
|
chunk = index >> ppc_bits;
|
|
|
|
/* align end to rpc edge, rpc size may not be a power 2 integer. */
|
|
max_pages = cli->cl_max_pages_per_rpc;
|
|
LASSERT((max_pages & ~chunk_mask) == 0);
|
|
max_end = index - (index % max_pages) + max_pages - 1;
|
|
max_end = min_t(pgoff_t, max_end, lock->cll_descr.cld_end);
|
|
|
|
/* initialize new extent by parameters so far */
|
|
cur->oe_max_end = max_end;
|
|
cur->oe_start = index & chunk_mask;
|
|
cur->oe_end = ((index + ~chunk_mask + 1) & chunk_mask) - 1;
|
|
if (cur->oe_start < lock->cll_descr.cld_start)
|
|
cur->oe_start = lock->cll_descr.cld_start;
|
|
if (cur->oe_end > max_end)
|
|
cur->oe_end = max_end;
|
|
cur->oe_osclock = lock;
|
|
cur->oe_grants = 0;
|
|
cur->oe_mppr = max_pages;
|
|
|
|
/* grants has been allocated by caller */
|
|
LASSERTF(*grants >= chunksize + cli->cl_extent_tax,
|
|
"%u/%u/%u.\n", *grants, chunksize, cli->cl_extent_tax);
|
|
LASSERTF((max_end - cur->oe_start) < max_pages, EXTSTR"\n",
|
|
EXTPARA(cur));
|
|
|
|
restart:
|
|
osc_object_lock(obj);
|
|
ext = osc_extent_search(obj, cur->oe_start);
|
|
if (!ext)
|
|
ext = first_extent(obj);
|
|
while (ext) {
|
|
loff_t ext_chk_start = ext->oe_start >> ppc_bits;
|
|
loff_t ext_chk_end = ext->oe_end >> ppc_bits;
|
|
|
|
LASSERT(sanity_check_nolock(ext) == 0);
|
|
if (chunk > ext_chk_end + 1)
|
|
break;
|
|
|
|
/* if covering by different locks, no chance to match */
|
|
if (lock != ext->oe_osclock) {
|
|
EASSERTF(!overlapped(ext, cur), ext,
|
|
EXTSTR"\n", EXTPARA(cur));
|
|
|
|
ext = next_extent(ext);
|
|
continue;
|
|
}
|
|
|
|
/* discontiguous chunks? */
|
|
if (chunk + 1 < ext_chk_start) {
|
|
ext = next_extent(ext);
|
|
continue;
|
|
}
|
|
|
|
/* ok, from now on, ext and cur have these attrs:
|
|
* 1. covered by the same lock
|
|
* 2. contiguous at chunk level or overlapping.
|
|
*/
|
|
|
|
if (overlapped(ext, cur)) {
|
|
/* cur is the minimum unit, so overlapping means
|
|
* full contain.
|
|
*/
|
|
EASSERTF((ext->oe_start <= cur->oe_start &&
|
|
ext->oe_end >= cur->oe_end),
|
|
ext, EXTSTR"\n", EXTPARA(cur));
|
|
|
|
if (ext->oe_state > OES_CACHE || ext->oe_fsync_wait) {
|
|
/* for simplicity, we wait for this extent to
|
|
* finish before going forward.
|
|
*/
|
|
conflict = osc_extent_get(ext);
|
|
break;
|
|
}
|
|
|
|
found = osc_extent_hold(ext);
|
|
break;
|
|
}
|
|
|
|
/* non-overlapped extent */
|
|
if (ext->oe_state != OES_CACHE || ext->oe_fsync_wait) {
|
|
/* we can't do anything for a non OES_CACHE extent, or
|
|
* if there is someone waiting for this extent to be
|
|
* flushed, try next one.
|
|
*/
|
|
ext = next_extent(ext);
|
|
continue;
|
|
}
|
|
|
|
/* check if they belong to the same rpc slot before trying to
|
|
* merge. the extents are not overlapped and contiguous at
|
|
* chunk level to get here.
|
|
*/
|
|
if (ext->oe_max_end != max_end) {
|
|
/* if they don't belong to the same RPC slot or
|
|
* max_pages_per_rpc has ever changed, do not merge.
|
|
*/
|
|
ext = next_extent(ext);
|
|
continue;
|
|
}
|
|
|
|
/* it's required that an extent must be contiguous at chunk
|
|
* level so that we know the whole extent is covered by grant
|
|
* (the pages in the extent are NOT required to be contiguous).
|
|
* Otherwise, it will be too much difficult to know which
|
|
* chunks have grants allocated.
|
|
*/
|
|
|
|
/* try to do front merge - extend ext's start */
|
|
if (chunk + 1 == ext_chk_start) {
|
|
/* ext must be chunk size aligned */
|
|
EASSERT((ext->oe_start & ~chunk_mask) == 0, ext);
|
|
|
|
/* pull ext's start back to cover cur */
|
|
ext->oe_start = cur->oe_start;
|
|
ext->oe_grants += chunksize;
|
|
*grants -= chunksize;
|
|
|
|
found = osc_extent_hold(ext);
|
|
} else if (chunk == ext_chk_end + 1) {
|
|
/* rear merge */
|
|
ext->oe_end = cur->oe_end;
|
|
ext->oe_grants += chunksize;
|
|
*grants -= chunksize;
|
|
|
|
/* try to merge with the next one because we just fill
|
|
* in a gap
|
|
*/
|
|
if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
|
|
/* we can save extent tax from next extent */
|
|
*grants += cli->cl_extent_tax;
|
|
|
|
found = osc_extent_hold(ext);
|
|
}
|
|
if (found)
|
|
break;
|
|
|
|
ext = next_extent(ext);
|
|
}
|
|
|
|
osc_extent_tree_dump(D_CACHE, obj);
|
|
if (found) {
|
|
LASSERT(!conflict);
|
|
if (!IS_ERR(found)) {
|
|
LASSERT(found->oe_osclock == cur->oe_osclock);
|
|
OSC_EXTENT_DUMP(D_CACHE, found,
|
|
"found caching ext for %lu.\n", index);
|
|
}
|
|
} else if (!conflict) {
|
|
/* create a new extent */
|
|
EASSERT(osc_extent_is_overlapped(obj, cur) == 0, cur);
|
|
cur->oe_grants = chunksize + cli->cl_extent_tax;
|
|
*grants -= cur->oe_grants;
|
|
LASSERT(*grants >= 0);
|
|
|
|
cur->oe_state = OES_CACHE;
|
|
found = osc_extent_hold(cur);
|
|
osc_extent_insert(obj, cur);
|
|
OSC_EXTENT_DUMP(D_CACHE, cur, "add into tree %lu/%lu.\n",
|
|
index, lock->cll_descr.cld_end);
|
|
}
|
|
osc_object_unlock(obj);
|
|
|
|
if (conflict) {
|
|
LASSERT(!found);
|
|
|
|
/* waiting for IO to finish. Please notice that it's impossible
|
|
* to be an OES_TRUNC extent.
|
|
*/
|
|
rc = osc_extent_wait(env, conflict, OES_INV);
|
|
osc_extent_put(env, conflict);
|
|
conflict = NULL;
|
|
if (rc < 0) {
|
|
found = ERR_PTR(rc);
|
|
goto out;
|
|
}
|
|
|
|
goto restart;
|
|
}
|
|
|
|
out:
|
|
osc_extent_put(env, cur);
|
|
LASSERT(*grants >= 0);
|
|
return found;
|
|
}
|
|
|
|
/**
|
|
* Called when IO is finished to an extent.
|
|
*/
|
|
int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
|
|
int sent, int rc)
|
|
{
|
|
struct client_obd *cli = osc_cli(ext->oe_obj);
|
|
struct osc_async_page *oap;
|
|
struct osc_async_page *tmp;
|
|
int nr_pages = ext->oe_nr_pages;
|
|
int lost_grant = 0;
|
|
int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
|
|
__u64 last_off = 0;
|
|
int last_count = -1;
|
|
|
|
OSC_EXTENT_DUMP(D_CACHE, ext, "extent finished.\n");
|
|
|
|
ext->oe_rc = rc ?: ext->oe_nr_pages;
|
|
EASSERT(ergo(rc == 0, ext->oe_state == OES_RPC), ext);
|
|
list_for_each_entry_safe(oap, tmp, &ext->oe_pages, oap_pending_item) {
|
|
list_del_init(&oap->oap_rpc_item);
|
|
list_del_init(&oap->oap_pending_item);
|
|
if (last_off <= oap->oap_obj_off) {
|
|
last_off = oap->oap_obj_off;
|
|
last_count = oap->oap_count;
|
|
}
|
|
|
|
--ext->oe_nr_pages;
|
|
osc_ap_completion(env, cli, oap, sent, rc);
|
|
}
|
|
EASSERT(ext->oe_nr_pages == 0, ext);
|
|
|
|
if (!sent) {
|
|
lost_grant = ext->oe_grants;
|
|
} else if (blocksize < PAGE_SIZE &&
|
|
last_count != PAGE_SIZE) {
|
|
/* For short writes we shouldn't count parts of pages that
|
|
* span a whole chunk on the OST side, or our accounting goes
|
|
* wrong. Should match the code in filter_grant_check.
|
|
*/
|
|
int offset = oap->oap_page_off & ~CFS_PAGE_MASK;
|
|
int count = oap->oap_count + (offset & (blocksize - 1));
|
|
int end = (offset + oap->oap_count) & (blocksize - 1);
|
|
|
|
if (end)
|
|
count += blocksize - end;
|
|
|
|
lost_grant = PAGE_SIZE - count;
|
|
}
|
|
if (ext->oe_grants > 0)
|
|
osc_free_grant(cli, nr_pages, lost_grant);
|
|
|
|
osc_extent_remove(ext);
|
|
/* put the refcount for RPC */
|
|
osc_extent_put(env, ext);
|
|
return 0;
|
|
}
|
|
|
|
static int extent_wait_cb(struct osc_extent *ext, int state)
|
|
{
|
|
int ret;
|
|
|
|
osc_object_lock(ext->oe_obj);
|
|
ret = ext->oe_state == state;
|
|
osc_object_unlock(ext->oe_obj);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Wait for the extent's state to become @state.
|
|
*/
|
|
static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
|
|
int state)
|
|
{
|
|
struct osc_object *obj = ext->oe_obj;
|
|
struct l_wait_info lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(600), NULL,
|
|
LWI_ON_SIGNAL_NOOP, NULL);
|
|
int rc = 0;
|
|
|
|
osc_object_lock(obj);
|
|
LASSERT(sanity_check_nolock(ext) == 0);
|
|
/* `Kick' this extent only if the caller is waiting for it to be
|
|
* written out.
|
|
*/
|
|
if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp &&
|
|
!ext->oe_trunc_pending) {
|
|
if (ext->oe_state == OES_ACTIVE) {
|
|
ext->oe_urgent = 1;
|
|
} else if (ext->oe_state == OES_CACHE) {
|
|
ext->oe_urgent = 1;
|
|
osc_extent_hold(ext);
|
|
rc = 1;
|
|
}
|
|
}
|
|
osc_object_unlock(obj);
|
|
if (rc == 1)
|
|
osc_extent_release(env, ext);
|
|
|
|
/* wait for the extent until its state becomes @state */
|
|
rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state), &lwi);
|
|
if (rc == -ETIMEDOUT) {
|
|
OSC_EXTENT_DUMP(D_ERROR, ext,
|
|
"%s: wait ext to %d timedout, recovery in progress?\n",
|
|
osc_export(obj)->exp_obd->obd_name, state);
|
|
|
|
lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
|
|
rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state),
|
|
&lwi);
|
|
}
|
|
if (rc == 0 && ext->oe_rc < 0)
|
|
rc = ext->oe_rc;
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Discard pages with index greater than @size. If @ext is overlapped with
|
|
* @size, then partial truncate happens.
|
|
*/
|
|
static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
|
|
bool partial)
|
|
{
|
|
struct cl_env_nest nest;
|
|
struct lu_env *env;
|
|
struct cl_io *io;
|
|
struct osc_object *obj = ext->oe_obj;
|
|
struct client_obd *cli = osc_cli(obj);
|
|
struct osc_async_page *oap;
|
|
struct osc_async_page *tmp;
|
|
int pages_in_chunk = 0;
|
|
int ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
|
|
__u64 trunc_chunk = trunc_index >> ppc_bits;
|
|
int grants = 0;
|
|
int nr_pages = 0;
|
|
int rc = 0;
|
|
|
|
LASSERT(sanity_check(ext) == 0);
|
|
EASSERT(ext->oe_state == OES_TRUNC, ext);
|
|
EASSERT(!ext->oe_urgent, ext);
|
|
|
|
/* Request new lu_env.
|
|
* We can't use that env from osc_cache_truncate_start() because
|
|
* it's from lov_io_sub and not fully initialized.
|
|
*/
|
|
env = cl_env_nested_get(&nest);
|
|
io = &osc_env_info(env)->oti_io;
|
|
io->ci_obj = cl_object_top(osc2cl(obj));
|
|
rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
|
|
if (rc < 0)
|
|
goto out;
|
|
|
|
/* discard all pages with index greater then trunc_index */
|
|
list_for_each_entry_safe(oap, tmp, &ext->oe_pages, oap_pending_item) {
|
|
struct cl_page *sub = oap2cl_page(oap);
|
|
struct cl_page *page = cl_page_top(sub);
|
|
|
|
LASSERT(list_empty(&oap->oap_rpc_item));
|
|
|
|
/* only discard the pages with their index greater than
|
|
* trunc_index, and ...
|
|
*/
|
|
if (sub->cp_index < trunc_index ||
|
|
(sub->cp_index == trunc_index && partial)) {
|
|
/* accounting how many pages remaining in the chunk
|
|
* so that we can calculate grants correctly. */
|
|
if (sub->cp_index >> ppc_bits == trunc_chunk)
|
|
++pages_in_chunk;
|
|
continue;
|
|
}
|
|
|
|
list_del_init(&oap->oap_pending_item);
|
|
|
|
cl_page_get(page);
|
|
lu_ref_add(&page->cp_reference, "truncate", current);
|
|
|
|
if (cl_page_own(env, io, page) == 0) {
|
|
cl_page_unmap(env, io, page);
|
|
cl_page_discard(env, io, page);
|
|
cl_page_disown(env, io, page);
|
|
} else {
|
|
LASSERT(page->cp_state == CPS_FREEING);
|
|
LASSERT(0);
|
|
}
|
|
|
|
lu_ref_del(&page->cp_reference, "truncate", current);
|
|
cl_page_put(env, page);
|
|
|
|
--ext->oe_nr_pages;
|
|
++nr_pages;
|
|
}
|
|
EASSERTF(ergo(ext->oe_start >= trunc_index + !!partial,
|
|
ext->oe_nr_pages == 0),
|
|
ext, "trunc_index %lu, partial %d\n", trunc_index, partial);
|
|
|
|
osc_object_lock(obj);
|
|
if (ext->oe_nr_pages == 0) {
|
|
LASSERT(pages_in_chunk == 0);
|
|
grants = ext->oe_grants;
|
|
ext->oe_grants = 0;
|
|
} else { /* calculate how many grants we can free */
|
|
int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk;
|
|
pgoff_t last_index;
|
|
|
|
/* if there is no pages in this chunk, we can also free grants
|
|
* for the last chunk
|
|
*/
|
|
if (pages_in_chunk == 0) {
|
|
/* if this is the 1st chunk and no pages in this chunk,
|
|
* ext->oe_nr_pages must be zero, so we should be in
|
|
* the other if-clause.
|
|
*/
|
|
LASSERT(trunc_chunk > 0);
|
|
--trunc_chunk;
|
|
++chunks;
|
|
}
|
|
|
|
/* this is what we can free from this extent */
|
|
grants = chunks << cli->cl_chunkbits;
|
|
ext->oe_grants -= grants;
|
|
last_index = ((trunc_chunk + 1) << ppc_bits) - 1;
|
|
ext->oe_end = min(last_index, ext->oe_max_end);
|
|
LASSERT(ext->oe_end >= ext->oe_start);
|
|
LASSERT(ext->oe_grants > 0);
|
|
}
|
|
osc_object_unlock(obj);
|
|
|
|
if (grants > 0 || nr_pages > 0)
|
|
osc_free_grant(cli, nr_pages, grants);
|
|
|
|
out:
|
|
cl_io_fini(env, io);
|
|
cl_env_nested_put(&nest, env);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* This function is used to make the extent prepared for transfer.
|
|
* A race with flushing page - ll_writepage() has to be handled cautiously.
|
|
*/
|
|
static int osc_extent_make_ready(const struct lu_env *env,
|
|
struct osc_extent *ext)
|
|
{
|
|
struct osc_async_page *oap;
|
|
struct osc_async_page *last = NULL;
|
|
struct osc_object *obj = ext->oe_obj;
|
|
int page_count = 0;
|
|
int rc;
|
|
|
|
/* we're going to grab page lock, so object lock must not be taken. */
|
|
LASSERT(sanity_check(ext) == 0);
|
|
/* in locking state, any process should not touch this extent. */
|
|
EASSERT(ext->oe_state == OES_LOCKING, ext);
|
|
EASSERT(ext->oe_owner, ext);
|
|
|
|
OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n");
|
|
|
|
list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
|
|
++page_count;
|
|
if (!last || last->oap_obj_off < oap->oap_obj_off)
|
|
last = oap;
|
|
|
|
/* checking ASYNC_READY is race safe */
|
|
if ((oap->oap_async_flags & ASYNC_READY) != 0)
|
|
continue;
|
|
|
|
rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
|
|
switch (rc) {
|
|
case 0:
|
|
spin_lock(&oap->oap_lock);
|
|
oap->oap_async_flags |= ASYNC_READY;
|
|
spin_unlock(&oap->oap_lock);
|
|
break;
|
|
case -EALREADY:
|
|
LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
|
|
break;
|
|
default:
|
|
LASSERTF(0, "unknown return code: %d\n", rc);
|
|
}
|
|
}
|
|
|
|
LASSERT(page_count == ext->oe_nr_pages);
|
|
LASSERT(last);
|
|
/* the last page is the only one we need to refresh its count by
|
|
* the size of file.
|
|
*/
|
|
if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) {
|
|
last->oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
|
|
LASSERT(last->oap_count > 0);
|
|
LASSERT(last->oap_page_off + last->oap_count <= PAGE_SIZE);
|
|
last->oap_async_flags |= ASYNC_COUNT_STABLE;
|
|
}
|
|
|
|
/* for the rest of pages, we don't need to call osf_refresh_count()
|
|
* because it's known they are not the last page
|
|
*/
|
|
list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
|
|
if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
|
|
oap->oap_count = PAGE_SIZE - oap->oap_page_off;
|
|
oap->oap_async_flags |= ASYNC_COUNT_STABLE;
|
|
}
|
|
}
|
|
|
|
osc_object_lock(obj);
|
|
osc_extent_state_set(ext, OES_RPC);
|
|
osc_object_unlock(obj);
|
|
/* get a refcount for RPC. */
|
|
osc_extent_get(ext);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Quick and simple version of osc_extent_find(). This function is frequently
|
|
* called to expand the extent for the same IO. To expand the extent, the
|
|
* page index must be in the same or next chunk of ext->oe_end.
|
|
*/
|
|
static int osc_extent_expand(struct osc_extent *ext, pgoff_t index, int *grants)
|
|
{
|
|
struct osc_object *obj = ext->oe_obj;
|
|
struct client_obd *cli = osc_cli(obj);
|
|
struct osc_extent *next;
|
|
int ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
|
|
pgoff_t chunk = index >> ppc_bits;
|
|
pgoff_t end_chunk;
|
|
pgoff_t end_index;
|
|
int chunksize = 1 << cli->cl_chunkbits;
|
|
int rc = 0;
|
|
|
|
LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
|
|
osc_object_lock(obj);
|
|
LASSERT(sanity_check_nolock(ext) == 0);
|
|
end_chunk = ext->oe_end >> ppc_bits;
|
|
if (chunk > end_chunk + 1) {
|
|
rc = -ERANGE;
|
|
goto out;
|
|
}
|
|
|
|
if (end_chunk >= chunk) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
LASSERT(end_chunk + 1 == chunk);
|
|
/* try to expand this extent to cover @index */
|
|
end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1);
|
|
|
|
next = next_extent(ext);
|
|
if (next && next->oe_start <= end_index) {
|
|
/* complex mode - overlapped with the next extent,
|
|
* this case will be handled by osc_extent_find()
|
|
*/
|
|
rc = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
ext->oe_end = end_index;
|
|
ext->oe_grants += chunksize;
|
|
*grants -= chunksize;
|
|
LASSERT(*grants >= 0);
|
|
EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
|
|
"overlapped after expanding for %lu.\n", index);
|
|
|
|
out:
|
|
osc_object_unlock(obj);
|
|
return rc;
|
|
}
|
|
|
|
static void osc_extent_tree_dump0(int level, struct osc_object *obj,
|
|
const char *func, int line)
|
|
{
|
|
struct osc_extent *ext;
|
|
int cnt;
|
|
|
|
CDEBUG(level, "Dump object %p extents at %s:%d, mppr: %u.\n",
|
|
obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
|
|
|
|
/* osc_object_lock(obj); */
|
|
cnt = 1;
|
|
for (ext = first_extent(obj); ext; ext = next_extent(ext))
|
|
OSC_EXTENT_DUMP(level, ext, "in tree %d.\n", cnt++);
|
|
|
|
cnt = 1;
|
|
list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
|
|
OSC_EXTENT_DUMP(level, ext, "hp %d.\n", cnt++);
|
|
|
|
cnt = 1;
|
|
list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
|
|
OSC_EXTENT_DUMP(level, ext, "urgent %d.\n", cnt++);
|
|
|
|
cnt = 1;
|
|
list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
|
|
OSC_EXTENT_DUMP(level, ext, "reading %d.\n", cnt++);
|
|
/* osc_object_unlock(obj); */
|
|
}
|
|
|
|
/* ------------------ osc extent end ------------------ */
|
|
|
|
static inline int osc_is_ready(struct osc_object *osc)
|
|
{
|
|
return !list_empty(&osc->oo_ready_item) ||
|
|
!list_empty(&osc->oo_hp_ready_item);
|
|
}
|
|
|
|
#define OSC_IO_DEBUG(OSC, STR, args...) \
|
|
CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
|
|
(OSC), osc_is_ready(OSC), \
|
|
list_empty_marker(&(OSC)->oo_hp_ready_item), \
|
|
list_empty_marker(&(OSC)->oo_ready_item), \
|
|
atomic_read(&(OSC)->oo_nr_writes), \
|
|
list_empty_marker(&(OSC)->oo_hp_exts), \
|
|
list_empty_marker(&(OSC)->oo_urgent_exts), \
|
|
atomic_read(&(OSC)->oo_nr_reads), \
|
|
list_empty_marker(&(OSC)->oo_reading_exts), \
|
|
##args)
|
|
|
|
static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
|
|
int cmd)
|
|
{
|
|
struct osc_page *opg = oap2osc_page(oap);
|
|
struct cl_page *page = cl_page_top(oap2cl_page(oap));
|
|
int result;
|
|
|
|
LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
|
|
|
|
result = cl_page_make_ready(env, page, CRT_WRITE);
|
|
if (result == 0)
|
|
opg->ops_submit_time = cfs_time_current();
|
|
return result;
|
|
}
|
|
|
|
static int osc_refresh_count(const struct lu_env *env,
|
|
struct osc_async_page *oap, int cmd)
|
|
{
|
|
struct osc_page *opg = oap2osc_page(oap);
|
|
struct cl_page *page = oap2cl_page(oap);
|
|
struct cl_object *obj;
|
|
struct cl_attr *attr = &osc_env_info(env)->oti_attr;
|
|
|
|
int result;
|
|
loff_t kms;
|
|
|
|
/* readpage queues with _COUNT_STABLE, shouldn't get here. */
|
|
LASSERT(!(cmd & OBD_BRW_READ));
|
|
obj = opg->ops_cl.cpl_obj;
|
|
|
|
cl_object_attr_lock(obj);
|
|
result = cl_object_attr_get(env, obj, attr);
|
|
cl_object_attr_unlock(obj);
|
|
if (result < 0)
|
|
return result;
|
|
kms = attr->cat_kms;
|
|
if (cl_offset(obj, page->cp_index) >= kms)
|
|
/* catch race with truncate */
|
|
return 0;
|
|
else if (cl_offset(obj, page->cp_index + 1) > kms)
|
|
/* catch sub-page write at end of file */
|
|
return kms % PAGE_SIZE;
|
|
else
|
|
return PAGE_SIZE;
|
|
}
|
|
|
|
static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
|
|
int cmd, int rc)
|
|
{
|
|
struct osc_page *opg = oap2osc_page(oap);
|
|
struct cl_page *page = cl_page_top(oap2cl_page(oap));
|
|
struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
|
|
enum cl_req_type crt;
|
|
int srvlock;
|
|
|
|
cmd &= ~OBD_BRW_NOQUOTA;
|
|
LASSERT(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ));
|
|
LASSERT(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE));
|
|
LASSERT(opg->ops_transfer_pinned);
|
|
|
|
/*
|
|
* page->cp_req can be NULL if io submission failed before
|
|
* cl_req was allocated.
|
|
*/
|
|
if (page->cp_req)
|
|
cl_req_page_done(env, page);
|
|
LASSERT(!page->cp_req);
|
|
|
|
crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE;
|
|
/* Clear opg->ops_transfer_pinned before VM lock is released. */
|
|
opg->ops_transfer_pinned = 0;
|
|
|
|
spin_lock(&obj->oo_seatbelt);
|
|
LASSERT(opg->ops_submitter);
|
|
LASSERT(!list_empty(&opg->ops_inflight));
|
|
list_del_init(&opg->ops_inflight);
|
|
opg->ops_submitter = NULL;
|
|
spin_unlock(&obj->oo_seatbelt);
|
|
|
|
opg->ops_submit_time = 0;
|
|
srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
|
|
|
|
/* statistic */
|
|
if (rc == 0 && srvlock) {
|
|
struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
|
|
struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
|
|
int bytes = oap->oap_count;
|
|
|
|
if (crt == CRT_READ)
|
|
stats->os_lockless_reads += bytes;
|
|
else
|
|
stats->os_lockless_writes += bytes;
|
|
}
|
|
|
|
/*
|
|
* This has to be the last operation with the page, as locks are
|
|
* released in cl_page_completion() and nothing except for the
|
|
* reference counter protects page from concurrent reclaim.
|
|
*/
|
|
lu_ref_del(&page->cp_reference, "transfer", page);
|
|
|
|
cl_page_completion(env, page, crt, rc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define OSC_DUMP_GRANT(cli, fmt, args...) do { \
|
|
struct client_obd *__tmp = (cli); \
|
|
CDEBUG(D_CACHE, "%s: { dirty: %ld/%ld dirty_pages: %d/%d " \
|
|
"dropped: %ld avail: %ld, reserved: %ld, flight: %d } " fmt, \
|
|
__tmp->cl_import->imp_obd->obd_name, \
|
|
__tmp->cl_dirty, __tmp->cl_dirty_max, \
|
|
atomic_read(&obd_dirty_pages), obd_max_dirty_pages, \
|
|
__tmp->cl_lost_grant, __tmp->cl_avail_grant, \
|
|
__tmp->cl_reserved_grant, __tmp->cl_w_in_flight, ##args); \
|
|
} while (0)
|
|
|
|
/* caller must hold loi_list_lock */
|
|
static void osc_consume_write_grant(struct client_obd *cli,
|
|
struct brw_page *pga)
|
|
{
|
|
assert_spin_locked(&cli->cl_loi_list_lock.lock);
|
|
LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
|
|
atomic_inc(&obd_dirty_pages);
|
|
cli->cl_dirty += PAGE_SIZE;
|
|
pga->flag |= OBD_BRW_FROM_GRANT;
|
|
CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
|
|
PAGE_SIZE, pga, pga->pg);
|
|
osc_update_next_shrink(cli);
|
|
}
|
|
|
|
/* the companion to osc_consume_write_grant, called when a brw has completed.
|
|
* must be called with the loi lock held.
|
|
*/
|
|
static void osc_release_write_grant(struct client_obd *cli,
|
|
struct brw_page *pga)
|
|
{
|
|
assert_spin_locked(&cli->cl_loi_list_lock.lock);
|
|
if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
|
|
return;
|
|
}
|
|
|
|
pga->flag &= ~OBD_BRW_FROM_GRANT;
|
|
atomic_dec(&obd_dirty_pages);
|
|
cli->cl_dirty -= PAGE_SIZE;
|
|
if (pga->flag & OBD_BRW_NOCACHE) {
|
|
pga->flag &= ~OBD_BRW_NOCACHE;
|
|
atomic_dec(&obd_dirty_transit_pages);
|
|
cli->cl_dirty_transit -= PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* To avoid sleeping with object lock held, it's good for us allocate enough
|
|
* grants before entering into critical section.
|
|
*
|
|
* client_obd_list_lock held by caller
|
|
*/
|
|
static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes)
|
|
{
|
|
int rc = -EDQUOT;
|
|
|
|
if (cli->cl_avail_grant >= bytes) {
|
|
cli->cl_avail_grant -= bytes;
|
|
cli->cl_reserved_grant += bytes;
|
|
rc = 0;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static void __osc_unreserve_grant(struct client_obd *cli,
|
|
unsigned int reserved, unsigned int unused)
|
|
{
|
|
/* it's quite normal for us to get more grant than reserved.
|
|
* Thinking about a case that two extents merged by adding a new
|
|
* chunk, we can save one extent tax. If extent tax is greater than
|
|
* one chunk, we can save more grant by adding a new chunk
|
|
*/
|
|
cli->cl_reserved_grant -= reserved;
|
|
if (unused > reserved) {
|
|
cli->cl_avail_grant += reserved;
|
|
cli->cl_lost_grant += unused - reserved;
|
|
} else {
|
|
cli->cl_avail_grant += unused;
|
|
}
|
|
}
|
|
|
|
static void osc_unreserve_grant(struct client_obd *cli,
|
|
unsigned int reserved, unsigned int unused)
|
|
{
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
__osc_unreserve_grant(cli, reserved, unused);
|
|
if (unused > 0)
|
|
osc_wake_cache_waiters(cli);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
}
|
|
|
|
/**
|
|
* Free grant after IO is finished or canceled.
|
|
*
|
|
* @lost_grant is used to remember how many grants we have allocated but not
|
|
* used, we should return these grants to OST. There're two cases where grants
|
|
* can be lost:
|
|
* 1. truncate;
|
|
* 2. blocksize at OST is less than PAGE_CACHE_SIZE and a partial page was
|
|
* written. In this case OST may use less chunks to serve this partial
|
|
* write. OSTs don't actually know the page size on the client side. so
|
|
* clients have to calculate lost grant by the blocksize on the OST.
|
|
* See filter_grant_check() for details.
|
|
*/
|
|
static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
|
|
unsigned int lost_grant)
|
|
{
|
|
int grant = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
|
|
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
atomic_sub(nr_pages, &obd_dirty_pages);
|
|
cli->cl_dirty -= nr_pages << PAGE_SHIFT;
|
|
cli->cl_lost_grant += lost_grant;
|
|
if (cli->cl_avail_grant < grant && cli->cl_lost_grant >= grant) {
|
|
/* borrow some grant from truncate to avoid the case that
|
|
* truncate uses up all avail grant
|
|
*/
|
|
cli->cl_lost_grant -= grant;
|
|
cli->cl_avail_grant += grant;
|
|
}
|
|
osc_wake_cache_waiters(cli);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu\n",
|
|
lost_grant, cli->cl_lost_grant,
|
|
cli->cl_avail_grant, cli->cl_dirty);
|
|
}
|
|
|
|
/**
|
|
* The companion to osc_enter_cache(), called when @oap is no longer part of
|
|
* the dirty accounting due to error.
|
|
*/
|
|
static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
|
|
{
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
osc_release_write_grant(cli, &oap->oap_brw_page);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
}
|
|
|
|
/**
|
|
* Non-blocking version of osc_enter_cache() that consumes grant only when it
|
|
* is available.
|
|
*/
|
|
static int osc_enter_cache_try(struct client_obd *cli,
|
|
struct osc_async_page *oap,
|
|
int bytes, int transient)
|
|
{
|
|
int rc;
|
|
|
|
OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
|
|
|
|
rc = osc_reserve_grant(cli, bytes);
|
|
if (rc < 0)
|
|
return 0;
|
|
|
|
if (cli->cl_dirty + PAGE_SIZE <= cli->cl_dirty_max &&
|
|
atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages) {
|
|
osc_consume_write_grant(cli, &oap->oap_brw_page);
|
|
if (transient) {
|
|
cli->cl_dirty_transit += PAGE_SIZE;
|
|
atomic_inc(&obd_dirty_transit_pages);
|
|
oap->oap_brw_flags |= OBD_BRW_NOCACHE;
|
|
}
|
|
rc = 1;
|
|
} else {
|
|
__osc_unreserve_grant(cli, bytes, bytes);
|
|
rc = 0;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
|
|
{
|
|
int rc;
|
|
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
rc = list_empty(&ocw->ocw_entry);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* The main entry to reserve dirty page accounting. Usually the grant reserved
|
|
* in this function will be freed in bulk in osc_free_grant() unless it fails
|
|
* to add osc cache, in that case, it will be freed in osc_exit_cache().
|
|
*
|
|
* The process will be put into sleep if it's already run out of grant.
|
|
*/
|
|
static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_async_page *oap, int bytes)
|
|
{
|
|
struct osc_object *osc = oap->oap_obj;
|
|
struct lov_oinfo *loi = osc->oo_oinfo;
|
|
struct osc_cache_waiter ocw;
|
|
struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
|
|
int rc = -EDQUOT;
|
|
|
|
OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
|
|
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
|
|
/* force the caller to try sync io. this can jump the list
|
|
* of queued writes and create a discontiguous rpc stream
|
|
*/
|
|
if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
|
|
cli->cl_dirty_max < PAGE_SIZE ||
|
|
cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) {
|
|
rc = -EDQUOT;
|
|
goto out;
|
|
}
|
|
|
|
/* Hopefully normal case - cache space and write credits available */
|
|
if (osc_enter_cache_try(cli, oap, bytes, 0)) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* We can get here for two reasons: too many dirty pages in cache, or
|
|
* run out of grants. In both cases we should write dirty pages out.
|
|
* Adding a cache waiter will trigger urgent write-out no matter what
|
|
* RPC size will be.
|
|
* The exiting condition is no avail grants and no dirty pages caching,
|
|
* that really means there is no space on the OST.
|
|
*/
|
|
init_waitqueue_head(&ocw.ocw_waitq);
|
|
ocw.ocw_oap = oap;
|
|
ocw.ocw_grant = bytes;
|
|
while (cli->cl_dirty > 0 || cli->cl_w_in_flight > 0) {
|
|
list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
|
|
ocw.ocw_rc = 0;
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
|
|
osc_io_unplug_async(env, cli, NULL);
|
|
|
|
CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
|
|
cli->cl_import->imp_obd->obd_name, &ocw, oap);
|
|
|
|
rc = l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
|
|
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
|
|
/* l_wait_event is interrupted by signal */
|
|
if (rc < 0) {
|
|
list_del_init(&ocw.ocw_entry);
|
|
goto out;
|
|
}
|
|
|
|
LASSERT(list_empty(&ocw.ocw_entry));
|
|
rc = ocw.ocw_rc;
|
|
|
|
if (rc != -EDQUOT)
|
|
goto out;
|
|
if (osc_enter_cache_try(cli, oap, bytes, 0)) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
OSC_DUMP_GRANT(cli, "returned %d.\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
/* caller must hold loi_list_lock */
|
|
void osc_wake_cache_waiters(struct client_obd *cli)
|
|
{
|
|
struct list_head *l, *tmp;
|
|
struct osc_cache_waiter *ocw;
|
|
|
|
list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
|
|
ocw = list_entry(l, struct osc_cache_waiter, ocw_entry);
|
|
list_del_init(&ocw->ocw_entry);
|
|
|
|
ocw->ocw_rc = -EDQUOT;
|
|
/* we can't dirty more */
|
|
if ((cli->cl_dirty + PAGE_SIZE > cli->cl_dirty_max) ||
|
|
(atomic_read(&obd_dirty_pages) + 1 >
|
|
obd_max_dirty_pages)) {
|
|
CDEBUG(D_CACHE, "no dirty room: dirty: %ld osc max %ld, sys max %d\n",
|
|
cli->cl_dirty,
|
|
cli->cl_dirty_max, obd_max_dirty_pages);
|
|
goto wakeup;
|
|
}
|
|
|
|
ocw->ocw_rc = 0;
|
|
if (!osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0))
|
|
ocw->ocw_rc = -EDQUOT;
|
|
|
|
wakeup:
|
|
CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld, %d\n",
|
|
ocw, ocw->ocw_oap, cli->cl_avail_grant, ocw->ocw_rc);
|
|
|
|
wake_up(&ocw->ocw_waitq);
|
|
}
|
|
}
|
|
|
|
static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc)
|
|
{
|
|
int hprpc = !!list_empty(&osc->oo_hp_exts);
|
|
|
|
return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
|
|
}
|
|
|
|
/* This maintains the lists of pending pages to read/write for a given object
|
|
* (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint()
|
|
* to quickly find objects that are ready to send an RPC.
|
|
*/
|
|
static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc,
|
|
int cmd)
|
|
{
|
|
int invalid_import = 0;
|
|
|
|
/* if we have an invalid import we want to drain the queued pages
|
|
* by forcing them through rpcs that immediately fail and complete
|
|
* the pages. recovery relies on this to empty the queued pages
|
|
* before canceling the locks and evicting down the llite pages
|
|
*/
|
|
if (!cli->cl_import || cli->cl_import->imp_invalid)
|
|
invalid_import = 1;
|
|
|
|
if (cmd & OBD_BRW_WRITE) {
|
|
if (atomic_read(&osc->oo_nr_writes) == 0)
|
|
return 0;
|
|
if (invalid_import) {
|
|
CDEBUG(D_CACHE, "invalid import forcing RPC\n");
|
|
return 1;
|
|
}
|
|
if (!list_empty(&osc->oo_hp_exts)) {
|
|
CDEBUG(D_CACHE, "high prio request forcing RPC\n");
|
|
return 1;
|
|
}
|
|
if (!list_empty(&osc->oo_urgent_exts)) {
|
|
CDEBUG(D_CACHE, "urgent request forcing RPC\n");
|
|
return 1;
|
|
}
|
|
/* trigger a write rpc stream as long as there are dirtiers
|
|
* waiting for space. as they're waiting, they're not going to
|
|
* create more pages to coalesce with what's waiting..
|
|
*/
|
|
if (!list_empty(&cli->cl_cache_waiters)) {
|
|
CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
|
|
return 1;
|
|
}
|
|
if (atomic_read(&osc->oo_nr_writes) >=
|
|
cli->cl_max_pages_per_rpc)
|
|
return 1;
|
|
} else {
|
|
if (atomic_read(&osc->oo_nr_reads) == 0)
|
|
return 0;
|
|
if (invalid_import) {
|
|
CDEBUG(D_CACHE, "invalid import forcing RPC\n");
|
|
return 1;
|
|
}
|
|
/* all read are urgent. */
|
|
if (!list_empty(&osc->oo_reading_exts))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void osc_update_pending(struct osc_object *obj, int cmd, int delta)
|
|
{
|
|
struct client_obd *cli = osc_cli(obj);
|
|
|
|
if (cmd & OBD_BRW_WRITE) {
|
|
atomic_add(delta, &obj->oo_nr_writes);
|
|
atomic_add(delta, &cli->cl_pending_w_pages);
|
|
LASSERT(atomic_read(&obj->oo_nr_writes) >= 0);
|
|
} else {
|
|
atomic_add(delta, &obj->oo_nr_reads);
|
|
atomic_add(delta, &cli->cl_pending_r_pages);
|
|
LASSERT(atomic_read(&obj->oo_nr_reads) >= 0);
|
|
}
|
|
OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
|
|
}
|
|
|
|
static int osc_makes_hprpc(struct osc_object *obj)
|
|
{
|
|
return !list_empty(&obj->oo_hp_exts);
|
|
}
|
|
|
|
static void on_list(struct list_head *item, struct list_head *list, int should_be_on)
|
|
{
|
|
if (list_empty(item) && should_be_on)
|
|
list_add_tail(item, list);
|
|
else if (!list_empty(item) && !should_be_on)
|
|
list_del_init(item);
|
|
}
|
|
|
|
/* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
|
|
* can find pages to build into rpcs quickly
|
|
*/
|
|
static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc)
|
|
{
|
|
if (osc_makes_hprpc(osc)) {
|
|
/* HP rpc */
|
|
on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0);
|
|
on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
|
|
} else {
|
|
on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
|
|
on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list,
|
|
osc_makes_rpc(cli, osc, OBD_BRW_WRITE) ||
|
|
osc_makes_rpc(cli, osc, OBD_BRW_READ));
|
|
}
|
|
|
|
on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
|
|
atomic_read(&osc->oo_nr_writes) > 0);
|
|
|
|
on_list(&osc->oo_read_item, &cli->cl_loi_read_list,
|
|
atomic_read(&osc->oo_nr_reads) > 0);
|
|
|
|
return osc_is_ready(osc);
|
|
}
|
|
|
|
static int osc_list_maint(struct client_obd *cli, struct osc_object *osc)
|
|
{
|
|
int is_ready;
|
|
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
is_ready = __osc_list_maint(cli, osc);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
|
|
return is_ready;
|
|
}
|
|
|
|
/* this is trying to propagate async writeback errors back up to the
|
|
* application. As an async write fails we record the error code for later if
|
|
* the app does an fsync. As long as errors persist we force future rpcs to be
|
|
* sync so that the app can get a sync error and break the cycle of queueing
|
|
* pages for which writeback will fail.
|
|
*/
|
|
static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
|
|
int rc)
|
|
{
|
|
if (rc) {
|
|
if (!ar->ar_rc)
|
|
ar->ar_rc = rc;
|
|
|
|
ar->ar_force_sync = 1;
|
|
ar->ar_min_xid = ptlrpc_sample_next_xid();
|
|
return;
|
|
|
|
}
|
|
|
|
if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
|
|
ar->ar_force_sync = 0;
|
|
}
|
|
|
|
/* this must be called holding the loi list lock to give coverage to exit_cache,
|
|
* async_flag maintenance, and oap_request
|
|
*/
|
|
static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_async_page *oap, int sent, int rc)
|
|
{
|
|
struct osc_object *osc = oap->oap_obj;
|
|
struct lov_oinfo *loi = osc->oo_oinfo;
|
|
__u64 xid = 0;
|
|
|
|
if (oap->oap_request) {
|
|
xid = ptlrpc_req_xid(oap->oap_request);
|
|
ptlrpc_req_finished(oap->oap_request);
|
|
oap->oap_request = NULL;
|
|
}
|
|
|
|
/* As the transfer for this page is being done, clear the flags */
|
|
spin_lock(&oap->oap_lock);
|
|
oap->oap_async_flags = 0;
|
|
spin_unlock(&oap->oap_lock);
|
|
oap->oap_interrupted = 0;
|
|
|
|
if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
osc_process_ar(&cli->cl_ar, xid, rc);
|
|
osc_process_ar(&loi->loi_ar, xid, rc);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
}
|
|
|
|
rc = osc_completion(env, oap, oap->oap_cmd, rc);
|
|
if (rc)
|
|
CERROR("completion on oap %p obj %p returns %d.\n",
|
|
oap, osc, rc);
|
|
}
|
|
|
|
/**
|
|
* Try to add extent to one RPC. We need to think about the following things:
|
|
* - # of pages must not be over max_pages_per_rpc
|
|
* - extent must be compatible with previous ones
|
|
*/
|
|
static int try_to_add_extent_for_io(struct client_obd *cli,
|
|
struct osc_extent *ext, struct list_head *rpclist,
|
|
int *pc, unsigned int *max_pages)
|
|
{
|
|
struct osc_extent *tmp;
|
|
struct osc_async_page *oap = list_first_entry(&ext->oe_pages,
|
|
struct osc_async_page,
|
|
oap_pending_item);
|
|
|
|
EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
|
|
ext);
|
|
|
|
*max_pages = max(ext->oe_mppr, *max_pages);
|
|
if (*pc + ext->oe_nr_pages > *max_pages)
|
|
return 0;
|
|
|
|
list_for_each_entry(tmp, rpclist, oe_link) {
|
|
struct osc_async_page *oap2;
|
|
|
|
oap2 = list_first_entry(&tmp->oe_pages, struct osc_async_page,
|
|
oap_pending_item);
|
|
EASSERT(tmp->oe_owner == current, tmp);
|
|
if (oap2cl_page(oap)->cp_type != oap2cl_page(oap2)->cp_type) {
|
|
CDEBUG(D_CACHE, "Do not permit different type of IO"
|
|
" for a same RPC\n");
|
|
return 0;
|
|
}
|
|
|
|
if (tmp->oe_srvlock != ext->oe_srvlock ||
|
|
!tmp->oe_grants != !ext->oe_grants)
|
|
return 0;
|
|
|
|
/* remove break for strict check */
|
|
break;
|
|
}
|
|
|
|
*pc += ext->oe_nr_pages;
|
|
list_move_tail(&ext->oe_link, rpclist);
|
|
ext->oe_owner = current;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* In order to prevent multiple ptlrpcd from breaking contiguous extents,
|
|
* get_write_extent() takes all appropriate extents in atomic.
|
|
*
|
|
* The following policy is used to collect extents for IO:
|
|
* 1. Add as many HP extents as possible;
|
|
* 2. Add the first urgent extent in urgent extent list and take it out of
|
|
* urgent list;
|
|
* 3. Add subsequent extents of this urgent extent;
|
|
* 4. If urgent list is not empty, goto 2;
|
|
* 5. Traverse the extent tree from the 1st extent;
|
|
* 6. Above steps exit if there is no space in this RPC.
|
|
*/
|
|
static int get_write_extents(struct osc_object *obj, struct list_head *rpclist)
|
|
{
|
|
struct client_obd *cli = osc_cli(obj);
|
|
struct osc_extent *ext;
|
|
struct osc_extent *temp;
|
|
int page_count = 0;
|
|
unsigned int max_pages = cli->cl_max_pages_per_rpc;
|
|
|
|
LASSERT(osc_object_is_locked(obj));
|
|
list_for_each_entry_safe(ext, temp, &obj->oo_hp_exts, oe_link) {
|
|
LASSERT(ext->oe_state == OES_CACHE);
|
|
if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
|
|
&max_pages))
|
|
return page_count;
|
|
EASSERT(ext->oe_nr_pages <= max_pages, ext);
|
|
}
|
|
if (page_count == max_pages)
|
|
return page_count;
|
|
|
|
while (!list_empty(&obj->oo_urgent_exts)) {
|
|
ext = list_entry(obj->oo_urgent_exts.next,
|
|
struct osc_extent, oe_link);
|
|
if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
|
|
&max_pages))
|
|
return page_count;
|
|
|
|
if (!ext->oe_intree)
|
|
continue;
|
|
|
|
while ((ext = next_extent(ext)) != NULL) {
|
|
if ((ext->oe_state != OES_CACHE) ||
|
|
(!list_empty(&ext->oe_link) &&
|
|
ext->oe_owner))
|
|
continue;
|
|
|
|
if (!try_to_add_extent_for_io(cli, ext, rpclist,
|
|
&page_count, &max_pages))
|
|
return page_count;
|
|
}
|
|
}
|
|
if (page_count == max_pages)
|
|
return page_count;
|
|
|
|
ext = first_extent(obj);
|
|
while (ext) {
|
|
if ((ext->oe_state != OES_CACHE) ||
|
|
/* this extent may be already in current rpclist */
|
|
(!list_empty(&ext->oe_link) && ext->oe_owner)) {
|
|
ext = next_extent(ext);
|
|
continue;
|
|
}
|
|
|
|
if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
|
|
&max_pages))
|
|
return page_count;
|
|
|
|
ext = next_extent(ext);
|
|
}
|
|
return page_count;
|
|
}
|
|
|
|
static int
|
|
osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_object *osc)
|
|
__must_hold(osc)
|
|
{
|
|
LIST_HEAD(rpclist);
|
|
struct osc_extent *ext;
|
|
struct osc_extent *tmp;
|
|
struct osc_extent *first = NULL;
|
|
u32 page_count = 0;
|
|
int srvlock = 0;
|
|
int rc = 0;
|
|
|
|
LASSERT(osc_object_is_locked(osc));
|
|
|
|
page_count = get_write_extents(osc, &rpclist);
|
|
LASSERT(equi(page_count == 0, list_empty(&rpclist)));
|
|
|
|
if (list_empty(&rpclist))
|
|
return 0;
|
|
|
|
osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
|
|
|
|
list_for_each_entry(ext, &rpclist, oe_link) {
|
|
LASSERT(ext->oe_state == OES_CACHE ||
|
|
ext->oe_state == OES_LOCK_DONE);
|
|
if (ext->oe_state == OES_CACHE)
|
|
osc_extent_state_set(ext, OES_LOCKING);
|
|
else
|
|
osc_extent_state_set(ext, OES_RPC);
|
|
}
|
|
|
|
/* we're going to grab page lock, so release object lock because
|
|
* lock order is page lock -> object lock.
|
|
*/
|
|
osc_object_unlock(osc);
|
|
|
|
list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
|
|
if (ext->oe_state == OES_LOCKING) {
|
|
rc = osc_extent_make_ready(env, ext);
|
|
if (unlikely(rc < 0)) {
|
|
list_del_init(&ext->oe_link);
|
|
osc_extent_finish(env, ext, 0, rc);
|
|
continue;
|
|
}
|
|
}
|
|
if (!first) {
|
|
first = ext;
|
|
srvlock = ext->oe_srvlock;
|
|
} else {
|
|
LASSERT(srvlock == ext->oe_srvlock);
|
|
}
|
|
}
|
|
|
|
if (!list_empty(&rpclist)) {
|
|
LASSERT(page_count > 0);
|
|
rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE);
|
|
LASSERT(list_empty(&rpclist));
|
|
}
|
|
|
|
osc_object_lock(osc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* prepare pages for ASYNC io and put pages in send queue.
|
|
*
|
|
* \param cmd OBD_BRW_* macroses
|
|
* \param lop pending pages
|
|
*
|
|
* \return zero if no page added to send queue.
|
|
* \return 1 if pages successfully added to send queue.
|
|
* \return negative on errors.
|
|
*/
|
|
static int
|
|
osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_object *osc)
|
|
__must_hold(osc)
|
|
{
|
|
struct osc_extent *ext;
|
|
struct osc_extent *next;
|
|
LIST_HEAD(rpclist);
|
|
int page_count = 0;
|
|
unsigned int max_pages = cli->cl_max_pages_per_rpc;
|
|
int rc = 0;
|
|
|
|
LASSERT(osc_object_is_locked(osc));
|
|
list_for_each_entry_safe(ext, next, &osc->oo_reading_exts, oe_link) {
|
|
EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
|
|
if (!try_to_add_extent_for_io(cli, ext, &rpclist, &page_count,
|
|
&max_pages))
|
|
break;
|
|
osc_extent_state_set(ext, OES_RPC);
|
|
EASSERT(ext->oe_nr_pages <= max_pages, ext);
|
|
}
|
|
LASSERT(page_count <= max_pages);
|
|
|
|
osc_update_pending(osc, OBD_BRW_READ, -page_count);
|
|
|
|
if (!list_empty(&rpclist)) {
|
|
osc_object_unlock(osc);
|
|
|
|
LASSERT(page_count > 0);
|
|
rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ);
|
|
LASSERT(list_empty(&rpclist));
|
|
|
|
osc_object_lock(osc);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
#define list_to_obj(list, item) ({ \
|
|
struct list_head *__tmp = (list)->next; \
|
|
list_del_init(__tmp); \
|
|
list_entry(__tmp, struct osc_object, oo_##item); \
|
|
})
|
|
|
|
/* This is called by osc_check_rpcs() to find which objects have pages that
|
|
* we could be sending. These lists are maintained by osc_makes_rpc().
|
|
*/
|
|
static struct osc_object *osc_next_obj(struct client_obd *cli)
|
|
{
|
|
/* First return objects that have blocked locks so that they
|
|
* will be flushed quickly and other clients can get the lock,
|
|
* then objects which have pages ready to be stuffed into RPCs
|
|
*/
|
|
if (!list_empty(&cli->cl_loi_hp_ready_list))
|
|
return list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item);
|
|
if (!list_empty(&cli->cl_loi_ready_list))
|
|
return list_to_obj(&cli->cl_loi_ready_list, ready_item);
|
|
|
|
/* then if we have cache waiters, return all objects with queued
|
|
* writes. This is especially important when many small files
|
|
* have filled up the cache and not been fired into rpcs because
|
|
* they don't pass the nr_pending/object threshold
|
|
*/
|
|
if (!list_empty(&cli->cl_cache_waiters) &&
|
|
!list_empty(&cli->cl_loi_write_list))
|
|
return list_to_obj(&cli->cl_loi_write_list, write_item);
|
|
|
|
/* then return all queued objects when we have an invalid import
|
|
* so that they get flushed
|
|
*/
|
|
if (!cli->cl_import || cli->cl_import->imp_invalid) {
|
|
if (!list_empty(&cli->cl_loi_write_list))
|
|
return list_to_obj(&cli->cl_loi_write_list, write_item);
|
|
if (!list_empty(&cli->cl_loi_read_list))
|
|
return list_to_obj(&cli->cl_loi_read_list, read_item);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* called with the loi list lock held */
|
|
static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
|
|
__must_hold(&cli->cl_loi_list_lock)
|
|
{
|
|
struct osc_object *osc;
|
|
int rc = 0;
|
|
|
|
while ((osc = osc_next_obj(cli)) != NULL) {
|
|
struct cl_object *obj = osc2cl(osc);
|
|
struct lu_ref_link link;
|
|
|
|
OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
|
|
|
|
if (osc_max_rpc_in_flight(cli, osc)) {
|
|
__osc_list_maint(cli, osc);
|
|
break;
|
|
}
|
|
|
|
cl_object_get(obj);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
lu_object_ref_add_at(&obj->co_lu, &link, "check",
|
|
current);
|
|
|
|
/* attempt some read/write balancing by alternating between
|
|
* reads and writes in an object. The makes_rpc checks here
|
|
* would be redundant if we were getting read/write work items
|
|
* instead of objects. we don't want send_oap_rpc to drain a
|
|
* partial read pending queue when we're given this object to
|
|
* do io on writes while there are cache waiters
|
|
*/
|
|
osc_object_lock(osc);
|
|
if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) {
|
|
rc = osc_send_write_rpc(env, cli, osc);
|
|
if (rc < 0) {
|
|
CERROR("Write request failed with %d\n", rc);
|
|
|
|
/* osc_send_write_rpc failed, mostly because of
|
|
* memory pressure.
|
|
*
|
|
* It can't break here, because if:
|
|
* - a page was submitted by osc_io_submit, so
|
|
* page locked;
|
|
* - no request in flight
|
|
* - no subsequent request
|
|
* The system will be in live-lock state,
|
|
* because there is no chance to call
|
|
* osc_io_unplug() and osc_check_rpcs() any
|
|
* more. pdflush can't help in this case,
|
|
* because it might be blocked at grabbing
|
|
* the page lock as we mentioned.
|
|
*
|
|
* Anyway, continue to drain pages.
|
|
*/
|
|
/* break; */
|
|
}
|
|
}
|
|
if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) {
|
|
rc = osc_send_read_rpc(env, cli, osc);
|
|
if (rc < 0)
|
|
CERROR("Read request failed with %d\n", rc);
|
|
}
|
|
osc_object_unlock(osc);
|
|
|
|
osc_list_maint(cli, osc);
|
|
lu_object_ref_del_at(&obj->co_lu, &link, "check",
|
|
current);
|
|
cl_object_put(env, obj);
|
|
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
}
|
|
}
|
|
|
|
static int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_object *osc, int async)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (osc && osc_list_maint(cli, osc) == 0)
|
|
return 0;
|
|
|
|
if (!async) {
|
|
/* disable osc_lru_shrink() temporarily to avoid
|
|
* potential stack overrun problem. LU-2859
|
|
*/
|
|
atomic_inc(&cli->cl_lru_shrinkers);
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
osc_check_rpcs(env, cli);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
atomic_dec(&cli->cl_lru_shrinkers);
|
|
} else {
|
|
CDEBUG(D_CACHE, "Queue writeback work for client %p.\n", cli);
|
|
LASSERT(cli->cl_writeback_work);
|
|
rc = ptlrpcd_queue_work(cli->cl_writeback_work);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int osc_io_unplug_async(const struct lu_env *env,
|
|
struct client_obd *cli, struct osc_object *osc)
|
|
{
|
|
return osc_io_unplug0(env, cli, osc, 1);
|
|
}
|
|
|
|
void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
|
|
struct osc_object *osc)
|
|
{
|
|
(void)osc_io_unplug0(env, cli, osc, 0);
|
|
}
|
|
|
|
int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
|
|
struct page *page, loff_t offset)
|
|
{
|
|
struct obd_export *exp = osc_export(osc);
|
|
struct osc_async_page *oap = &ops->ops_oap;
|
|
|
|
if (!page)
|
|
return cfs_size_round(sizeof(*oap));
|
|
|
|
oap->oap_magic = OAP_MAGIC;
|
|
oap->oap_cli = &exp->exp_obd->u.cli;
|
|
oap->oap_obj = osc;
|
|
|
|
oap->oap_page = page;
|
|
oap->oap_obj_off = offset;
|
|
LASSERT(!(offset & ~CFS_PAGE_MASK));
|
|
|
|
if (!client_is_remote(exp) && capable(CFS_CAP_SYS_RESOURCE))
|
|
oap->oap_brw_flags = OBD_BRW_NOQUOTA;
|
|
|
|
INIT_LIST_HEAD(&oap->oap_pending_item);
|
|
INIT_LIST_HEAD(&oap->oap_rpc_item);
|
|
|
|
spin_lock_init(&oap->oap_lock);
|
|
CDEBUG(D_INFO, "oap %p page %p obj off %llu\n",
|
|
oap, page, oap->oap_obj_off);
|
|
return 0;
|
|
}
|
|
|
|
int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
|
|
struct osc_page *ops)
|
|
{
|
|
struct osc_io *oio = osc_env_io(env);
|
|
struct osc_extent *ext = NULL;
|
|
struct osc_async_page *oap = &ops->ops_oap;
|
|
struct client_obd *cli = oap->oap_cli;
|
|
struct osc_object *osc = oap->oap_obj;
|
|
pgoff_t index;
|
|
int grants = 0;
|
|
int brw_flags = OBD_BRW_ASYNC;
|
|
int cmd = OBD_BRW_WRITE;
|
|
int need_release = 0;
|
|
int rc = 0;
|
|
|
|
if (oap->oap_magic != OAP_MAGIC)
|
|
return -EINVAL;
|
|
|
|
if (!cli->cl_import || cli->cl_import->imp_invalid)
|
|
return -EIO;
|
|
|
|
if (!list_empty(&oap->oap_pending_item) ||
|
|
!list_empty(&oap->oap_rpc_item))
|
|
return -EBUSY;
|
|
|
|
/* Set the OBD_BRW_SRVLOCK before the page is queued. */
|
|
brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
|
|
if (!client_is_remote(osc_export(osc)) &&
|
|
capable(CFS_CAP_SYS_RESOURCE)) {
|
|
brw_flags |= OBD_BRW_NOQUOTA;
|
|
cmd |= OBD_BRW_NOQUOTA;
|
|
}
|
|
|
|
/* check if the file's owner/group is over quota */
|
|
if (!(cmd & OBD_BRW_NOQUOTA)) {
|
|
struct cl_object *obj;
|
|
struct cl_attr *attr;
|
|
unsigned int qid[MAXQUOTAS];
|
|
|
|
obj = cl_object_top(&osc->oo_cl);
|
|
attr = &osc_env_info(env)->oti_attr;
|
|
|
|
cl_object_attr_lock(obj);
|
|
rc = cl_object_attr_get(env, obj, attr);
|
|
cl_object_attr_unlock(obj);
|
|
|
|
qid[USRQUOTA] = attr->cat_uid;
|
|
qid[GRPQUOTA] = attr->cat_gid;
|
|
if (rc == 0 && osc_quota_chkdq(cli, qid) == NO_QUOTA)
|
|
rc = -EDQUOT;
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
oap->oap_cmd = cmd;
|
|
oap->oap_page_off = ops->ops_from;
|
|
oap->oap_count = ops->ops_to - ops->ops_from;
|
|
oap->oap_async_flags = 0;
|
|
oap->oap_brw_flags = brw_flags;
|
|
|
|
OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n",
|
|
oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK);
|
|
|
|
index = oap2cl_page(oap)->cp_index;
|
|
|
|
/* Add this page into extent by the following steps:
|
|
* 1. if there exists an active extent for this IO, mostly this page
|
|
* can be added to the active extent and sometimes we need to
|
|
* expand extent to accommodate this page;
|
|
* 2. otherwise, a new extent will be allocated.
|
|
*/
|
|
|
|
ext = oio->oi_active;
|
|
if (ext && ext->oe_start <= index && ext->oe_max_end >= index) {
|
|
/* one chunk plus extent overhead must be enough to write this
|
|
* page
|
|
*/
|
|
grants = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
|
|
if (ext->oe_end >= index)
|
|
grants = 0;
|
|
|
|
/* it doesn't need any grant to dirty this page */
|
|
client_obd_list_lock(&cli->cl_loi_list_lock);
|
|
rc = osc_enter_cache_try(cli, oap, grants, 0);
|
|
client_obd_list_unlock(&cli->cl_loi_list_lock);
|
|
if (rc == 0) { /* try failed */
|
|
grants = 0;
|
|
need_release = 1;
|
|
} else if (ext->oe_end < index) {
|
|
int tmp = grants;
|
|
/* try to expand this extent */
|
|
rc = osc_extent_expand(ext, index, &tmp);
|
|
if (rc < 0) {
|
|
need_release = 1;
|
|
/* don't free reserved grant */
|
|
} else {
|
|
OSC_EXTENT_DUMP(D_CACHE, ext,
|
|
"expanded for %lu.\n", index);
|
|
osc_unreserve_grant(cli, grants, tmp);
|
|
grants = 0;
|
|
}
|
|
}
|
|
rc = 0;
|
|
} else if (ext) {
|
|
/* index is located outside of active extent */
|
|
need_release = 1;
|
|
}
|
|
if (need_release) {
|
|
osc_extent_release(env, ext);
|
|
oio->oi_active = NULL;
|
|
ext = NULL;
|
|
}
|
|
|
|
if (!ext) {
|
|
int tmp = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
|
|
|
|
/* try to find new extent to cover this page */
|
|
LASSERT(!oio->oi_active);
|
|
/* we may have allocated grant for this page if we failed
|
|
* to expand the previous active extent.
|
|
*/
|
|
LASSERT(ergo(grants > 0, grants >= tmp));
|
|
|
|
rc = 0;
|
|
if (grants == 0) {
|
|
/* we haven't allocated grant for this page. */
|
|
rc = osc_enter_cache(env, cli, oap, tmp);
|
|
if (rc == 0)
|
|
grants = tmp;
|
|
}
|
|
|
|
tmp = grants;
|
|
if (rc == 0) {
|
|
ext = osc_extent_find(env, osc, index, &tmp);
|
|
if (IS_ERR(ext)) {
|
|
LASSERT(tmp == grants);
|
|
osc_exit_cache(cli, oap);
|
|
rc = PTR_ERR(ext);
|
|
ext = NULL;
|
|
} else {
|
|
oio->oi_active = ext;
|
|
}
|
|
}
|
|
if (grants > 0)
|
|
osc_unreserve_grant(cli, grants, tmp);
|
|
}
|
|
|
|
LASSERT(ergo(rc == 0, ext));
|
|
if (ext) {
|
|
EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
|
|
ext, "index = %lu.\n", index);
|
|
LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
|
|
|
|
osc_object_lock(osc);
|
|
if (ext->oe_nr_pages == 0)
|
|
ext->oe_srvlock = ops->ops_srvlock;
|
|
else
|
|
LASSERT(ext->oe_srvlock == ops->ops_srvlock);
|
|
++ext->oe_nr_pages;
|
|
list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
|
|
osc_object_unlock(osc);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int osc_teardown_async_page(const struct lu_env *env,
|
|
struct osc_object *obj, struct osc_page *ops)
|
|
{
|
|
struct osc_async_page *oap = &ops->ops_oap;
|
|
struct osc_extent *ext = NULL;
|
|
int rc = 0;
|
|
|
|
LASSERT(oap->oap_magic == OAP_MAGIC);
|
|
|
|
CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
|
|
oap, ops, oap2cl_page(oap)->cp_index);
|
|
|
|
osc_object_lock(obj);
|
|
if (!list_empty(&oap->oap_rpc_item)) {
|
|
CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
|
|
rc = -EBUSY;
|
|
} else if (!list_empty(&oap->oap_pending_item)) {
|
|
ext = osc_extent_lookup(obj, oap2cl_page(oap)->cp_index);
|
|
/* only truncated pages are allowed to be taken out.
|
|
* See osc_extent_truncate() and osc_cache_truncate_start()
|
|
* for details.
|
|
*/
|
|
if (ext && ext->oe_state != OES_TRUNC) {
|
|
OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
|
|
oap2cl_page(oap)->cp_index);
|
|
rc = -EBUSY;
|
|
}
|
|
}
|
|
osc_object_unlock(obj);
|
|
if (ext)
|
|
osc_extent_put(env, ext);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* This is called when a page is picked up by kernel to write out.
|
|
*
|
|
* We should find out the corresponding extent and add the whole extent
|
|
* into urgent list. The extent may be being truncated or used, handle it
|
|
* carefully.
|
|
*/
|
|
int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
|
|
struct osc_page *ops)
|
|
{
|
|
struct osc_extent *ext = NULL;
|
|
struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj);
|
|
struct cl_page *cp = ops->ops_cl.cpl_page;
|
|
pgoff_t index = cp->cp_index;
|
|
struct osc_async_page *oap = &ops->ops_oap;
|
|
bool unplug = false;
|
|
int rc = 0;
|
|
|
|
osc_object_lock(obj);
|
|
ext = osc_extent_lookup(obj, index);
|
|
if (!ext) {
|
|
osc_extent_tree_dump(D_ERROR, obj);
|
|
LASSERTF(0, "page index %lu is NOT covered.\n", index);
|
|
}
|
|
|
|
switch (ext->oe_state) {
|
|
case OES_RPC:
|
|
case OES_LOCK_DONE:
|
|
CL_PAGE_DEBUG(D_ERROR, env, cl_page_top(cp),
|
|
"flush an in-rpc page?\n");
|
|
LASSERT(0);
|
|
break;
|
|
case OES_LOCKING:
|
|
/* If we know this extent is being written out, we should abort
|
|
* so that the writer can make this page ready. Otherwise, there
|
|
* exists a deadlock problem because other process can wait for
|
|
* page writeback bit holding page lock; and meanwhile in
|
|
* vvp_page_make_ready(), we need to grab page lock before
|
|
* really sending the RPC.
|
|
*/
|
|
case OES_TRUNC:
|
|
/* race with truncate, page will be redirtied */
|
|
case OES_ACTIVE:
|
|
/* The extent is active so we need to abort and let the caller
|
|
* re-dirty the page. If we continued on here, and we were the
|
|
* one making the extent active, we could deadlock waiting for
|
|
* the page writeback to clear but it won't because the extent
|
|
* is active and won't be written out.
|
|
*/
|
|
rc = -EAGAIN;
|
|
goto out;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
rc = cl_page_prep(env, io, cl_page_top(cp), CRT_WRITE);
|
|
if (rc)
|
|
goto out;
|
|
|
|
spin_lock(&oap->oap_lock);
|
|
oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
|
|
spin_unlock(&oap->oap_lock);
|
|
|
|
if (memory_pressure_get())
|
|
ext->oe_memalloc = 1;
|
|
|
|
ext->oe_urgent = 1;
|
|
if (ext->oe_state == OES_CACHE) {
|
|
OSC_EXTENT_DUMP(D_CACHE, ext,
|
|
"flush page %p make it urgent.\n", oap);
|
|
if (list_empty(&ext->oe_link))
|
|
list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
|
|
unplug = true;
|
|
}
|
|
rc = 0;
|
|
|
|
out:
|
|
osc_object_unlock(obj);
|
|
osc_extent_put(env, ext);
|
|
if (unplug)
|
|
osc_io_unplug_async(env, osc_cli(obj), obj);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* this is called when a sync waiter receives an interruption. Its job is to
|
|
* get the caller woken as soon as possible. If its page hasn't been put in an
|
|
* rpc yet it can dequeue immediately. Otherwise it has to mark the rpc as
|
|
* desiring interruption which will forcefully complete the rpc once the rpc
|
|
* has timed out.
|
|
*/
|
|
int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops)
|
|
{
|
|
struct osc_async_page *oap = &ops->ops_oap;
|
|
struct osc_object *obj = oap->oap_obj;
|
|
struct client_obd *cli = osc_cli(obj);
|
|
struct osc_extent *ext;
|
|
struct osc_extent *found = NULL;
|
|
struct list_head *plist;
|
|
pgoff_t index = oap2cl_page(oap)->cp_index;
|
|
int rc = -EBUSY;
|
|
int cmd;
|
|
|
|
LASSERT(!oap->oap_interrupted);
|
|
oap->oap_interrupted = 1;
|
|
|
|
/* Find out the caching extent */
|
|
osc_object_lock(obj);
|
|
if (oap->oap_cmd & OBD_BRW_WRITE) {
|
|
plist = &obj->oo_urgent_exts;
|
|
cmd = OBD_BRW_WRITE;
|
|
} else {
|
|
plist = &obj->oo_reading_exts;
|
|
cmd = OBD_BRW_READ;
|
|
}
|
|
list_for_each_entry(ext, plist, oe_link) {
|
|
if (ext->oe_start <= index && ext->oe_end >= index) {
|
|
LASSERT(ext->oe_state == OES_LOCK_DONE);
|
|
/* For OES_LOCK_DONE state extent, it has already held
|
|
* a refcount for RPC.
|
|
*/
|
|
found = osc_extent_get(ext);
|
|
break;
|
|
}
|
|
}
|
|
if (found) {
|
|
list_del_init(&found->oe_link);
|
|
osc_update_pending(obj, cmd, -found->oe_nr_pages);
|
|
osc_object_unlock(obj);
|
|
|
|
osc_extent_finish(env, found, 0, -EINTR);
|
|
osc_extent_put(env, found);
|
|
rc = 0;
|
|
} else {
|
|
osc_object_unlock(obj);
|
|
/* ok, it's been put in an rpc. only one oap gets a request
|
|
* reference
|
|
*/
|
|
if (oap->oap_request) {
|
|
ptlrpc_mark_interrupted(oap->oap_request);
|
|
ptlrpcd_wake(oap->oap_request);
|
|
ptlrpc_req_finished(oap->oap_request);
|
|
oap->oap_request = NULL;
|
|
}
|
|
}
|
|
|
|
osc_list_maint(cli, obj);
|
|
return rc;
|
|
}
|
|
|
|
int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
|
|
struct list_head *list, int cmd, int brw_flags)
|
|
{
|
|
struct client_obd *cli = osc_cli(obj);
|
|
struct osc_extent *ext;
|
|
struct osc_async_page *oap, *tmp;
|
|
int page_count = 0;
|
|
int mppr = cli->cl_max_pages_per_rpc;
|
|
pgoff_t start = CL_PAGE_EOF;
|
|
pgoff_t end = 0;
|
|
|
|
list_for_each_entry(oap, list, oap_pending_item) {
|
|
struct cl_page *cp = oap2cl_page(oap);
|
|
|
|
if (cp->cp_index > end)
|
|
end = cp->cp_index;
|
|
if (cp->cp_index < start)
|
|
start = cp->cp_index;
|
|
++page_count;
|
|
mppr <<= (page_count > mppr);
|
|
}
|
|
|
|
ext = osc_extent_alloc(obj);
|
|
if (!ext) {
|
|
list_for_each_entry_safe(oap, tmp, list, oap_pending_item) {
|
|
list_del_init(&oap->oap_pending_item);
|
|
osc_ap_completion(env, cli, oap, 0, -ENOMEM);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ext->oe_rw = !!(cmd & OBD_BRW_READ);
|
|
ext->oe_urgent = 1;
|
|
ext->oe_start = start;
|
|
ext->oe_end = ext->oe_max_end = end;
|
|
ext->oe_obj = obj;
|
|
ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
|
|
ext->oe_nr_pages = page_count;
|
|
ext->oe_mppr = mppr;
|
|
list_splice_init(list, &ext->oe_pages);
|
|
|
|
osc_object_lock(obj);
|
|
/* Reuse the initial refcount for RPC, don't drop it */
|
|
osc_extent_state_set(ext, OES_LOCK_DONE);
|
|
if (cmd & OBD_BRW_WRITE) {
|
|
list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
|
|
osc_update_pending(obj, OBD_BRW_WRITE, page_count);
|
|
} else {
|
|
list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
|
|
osc_update_pending(obj, OBD_BRW_READ, page_count);
|
|
}
|
|
osc_object_unlock(obj);
|
|
|
|
osc_io_unplug_async(env, cli, obj);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Called by osc_io_setattr_start() to freeze and destroy covering extents.
|
|
*/
|
|
int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
|
|
struct osc_object *obj, __u64 size)
|
|
{
|
|
struct client_obd *cli = osc_cli(obj);
|
|
struct osc_extent *ext;
|
|
struct osc_extent *temp;
|
|
struct osc_extent *waiting = NULL;
|
|
pgoff_t index;
|
|
LIST_HEAD(list);
|
|
int result = 0;
|
|
bool partial;
|
|
|
|
/* pages with index greater or equal to index will be truncated. */
|
|
index = cl_index(osc2cl(obj), size);
|
|
partial = size > cl_offset(osc2cl(obj), index);
|
|
|
|
again:
|
|
osc_object_lock(obj);
|
|
ext = osc_extent_search(obj, index);
|
|
if (!ext)
|
|
ext = first_extent(obj);
|
|
else if (ext->oe_end < index)
|
|
ext = next_extent(ext);
|
|
while (ext) {
|
|
EASSERT(ext->oe_state != OES_TRUNC, ext);
|
|
|
|
if (ext->oe_state > OES_CACHE || ext->oe_urgent) {
|
|
/* if ext is in urgent state, it means there must exist
|
|
* a page already having been flushed by write_page().
|
|
* We have to wait for this extent because we can't
|
|
* truncate that page.
|
|
*/
|
|
LASSERT(!ext->oe_hp);
|
|
OSC_EXTENT_DUMP(D_CACHE, ext,
|
|
"waiting for busy extent\n");
|
|
waiting = osc_extent_get(ext);
|
|
break;
|
|
}
|
|
|
|
OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:%llu.\n", size);
|
|
|
|
osc_extent_get(ext);
|
|
if (ext->oe_state == OES_ACTIVE) {
|
|
/* though we grab inode mutex for write path, but we
|
|
* release it before releasing extent(in osc_io_end()),
|
|
* so there is a race window that an extent is still
|
|
* in OES_ACTIVE when truncate starts.
|
|
*/
|
|
LASSERT(!ext->oe_trunc_pending);
|
|
ext->oe_trunc_pending = 1;
|
|
} else {
|
|
EASSERT(ext->oe_state == OES_CACHE, ext);
|
|
osc_extent_state_set(ext, OES_TRUNC);
|
|
osc_update_pending(obj, OBD_BRW_WRITE,
|
|
-ext->oe_nr_pages);
|
|
}
|
|
EASSERT(list_empty(&ext->oe_link), ext);
|
|
list_add_tail(&ext->oe_link, &list);
|
|
|
|
ext = next_extent(ext);
|
|
}
|
|
osc_object_unlock(obj);
|
|
|
|
osc_list_maint(cli, obj);
|
|
|
|
list_for_each_entry_safe(ext, temp, &list, oe_link) {
|
|
int rc;
|
|
|
|
list_del_init(&ext->oe_link);
|
|
|
|
/* extent may be in OES_ACTIVE state because inode mutex
|
|
* is released before osc_io_end() in file write case
|
|
*/
|
|
if (ext->oe_state != OES_TRUNC)
|
|
osc_extent_wait(env, ext, OES_TRUNC);
|
|
|
|
rc = osc_extent_truncate(ext, index, partial);
|
|
if (rc < 0) {
|
|
if (result == 0)
|
|
result = rc;
|
|
|
|
OSC_EXTENT_DUMP(D_ERROR, ext,
|
|
"truncate error %d\n", rc);
|
|
} else if (ext->oe_nr_pages == 0) {
|
|
osc_extent_remove(ext);
|
|
} else {
|
|
/* this must be an overlapped extent which means only
|
|
* part of pages in this extent have been truncated.
|
|
*/
|
|
EASSERTF(ext->oe_start <= index, ext,
|
|
"trunc index = %lu/%d.\n", index, partial);
|
|
/* fix index to skip this partially truncated extent */
|
|
index = ext->oe_end + 1;
|
|
partial = false;
|
|
|
|
/* we need to hold this extent in OES_TRUNC state so
|
|
* that no writeback will happen. This is to avoid
|
|
* BUG 17397.
|
|
*/
|
|
LASSERT(!oio->oi_trunc);
|
|
oio->oi_trunc = osc_extent_get(ext);
|
|
OSC_EXTENT_DUMP(D_CACHE, ext,
|
|
"trunc at %llu\n", size);
|
|
}
|
|
osc_extent_put(env, ext);
|
|
}
|
|
if (waiting) {
|
|
int rc;
|
|
|
|
/* ignore the result of osc_extent_wait the write initiator
|
|
* should take care of it.
|
|
*/
|
|
rc = osc_extent_wait(env, waiting, OES_INV);
|
|
if (rc < 0)
|
|
OSC_EXTENT_DUMP(D_CACHE, waiting, "error: %d.\n", rc);
|
|
|
|
osc_extent_put(env, waiting);
|
|
waiting = NULL;
|
|
goto again;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
|
|
*/
|
|
void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
|
|
struct osc_object *obj)
|
|
{
|
|
struct osc_extent *ext = oio->oi_trunc;
|
|
|
|
oio->oi_trunc = NULL;
|
|
if (ext) {
|
|
bool unplug = false;
|
|
|
|
EASSERT(ext->oe_nr_pages > 0, ext);
|
|
EASSERT(ext->oe_state == OES_TRUNC, ext);
|
|
EASSERT(!ext->oe_urgent, ext);
|
|
|
|
OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
|
|
osc_object_lock(obj);
|
|
osc_extent_state_set(ext, OES_CACHE);
|
|
if (ext->oe_fsync_wait && !ext->oe_urgent) {
|
|
ext->oe_urgent = 1;
|
|
list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
|
|
unplug = true;
|
|
}
|
|
osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
|
|
osc_object_unlock(obj);
|
|
osc_extent_put(env, ext);
|
|
|
|
if (unplug)
|
|
osc_io_unplug_async(env, osc_cli(obj), obj);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Wait for extents in a specific range to be written out.
|
|
* The caller must have called osc_cache_writeback_range() to issue IO
|
|
* otherwise it will take a long time for this function to finish.
|
|
*
|
|
* Caller must hold inode_mutex , or cancel exclusive dlm lock so that
|
|
* nobody else can dirty this range of file while we're waiting for
|
|
* extents to be written.
|
|
*/
|
|
int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
|
|
pgoff_t start, pgoff_t end)
|
|
{
|
|
struct osc_extent *ext;
|
|
pgoff_t index = start;
|
|
int result = 0;
|
|
|
|
again:
|
|
osc_object_lock(obj);
|
|
ext = osc_extent_search(obj, index);
|
|
if (!ext)
|
|
ext = first_extent(obj);
|
|
else if (ext->oe_end < index)
|
|
ext = next_extent(ext);
|
|
while (ext) {
|
|
int rc;
|
|
|
|
if (ext->oe_start > end)
|
|
break;
|
|
|
|
if (!ext->oe_fsync_wait) {
|
|
ext = next_extent(ext);
|
|
continue;
|
|
}
|
|
|
|
EASSERT(ergo(ext->oe_state == OES_CACHE,
|
|
ext->oe_hp || ext->oe_urgent), ext);
|
|
EASSERT(ergo(ext->oe_state == OES_ACTIVE,
|
|
!ext->oe_hp && ext->oe_urgent), ext);
|
|
|
|
index = ext->oe_end + 1;
|
|
osc_extent_get(ext);
|
|
osc_object_unlock(obj);
|
|
|
|
rc = osc_extent_wait(env, ext, OES_INV);
|
|
if (result == 0)
|
|
result = rc;
|
|
osc_extent_put(env, ext);
|
|
goto again;
|
|
}
|
|
osc_object_unlock(obj);
|
|
|
|
OSC_IO_DEBUG(obj, "sync file range.\n");
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Called to write out a range of osc object.
|
|
*
|
|
* @hp : should be set this is caused by lock cancel;
|
|
* @discard: is set if dirty pages should be dropped - file will be deleted or
|
|
* truncated, this implies there is no partially discarding extents.
|
|
*
|
|
* Return how many pages will be issued, or error code if error occurred.
|
|
*/
|
|
int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
|
|
pgoff_t start, pgoff_t end, int hp, int discard)
|
|
{
|
|
struct osc_extent *ext;
|
|
LIST_HEAD(discard_list);
|
|
bool unplug = false;
|
|
int result = 0;
|
|
|
|
osc_object_lock(obj);
|
|
ext = osc_extent_search(obj, start);
|
|
if (!ext)
|
|
ext = first_extent(obj);
|
|
else if (ext->oe_end < start)
|
|
ext = next_extent(ext);
|
|
while (ext) {
|
|
if (ext->oe_start > end)
|
|
break;
|
|
|
|
ext->oe_fsync_wait = 1;
|
|
switch (ext->oe_state) {
|
|
case OES_CACHE:
|
|
result += ext->oe_nr_pages;
|
|
if (!discard) {
|
|
struct list_head *list = NULL;
|
|
|
|
if (hp) {
|
|
EASSERT(!ext->oe_hp, ext);
|
|
ext->oe_hp = 1;
|
|
list = &obj->oo_hp_exts;
|
|
} else if (!ext->oe_urgent) {
|
|
ext->oe_urgent = 1;
|
|
list = &obj->oo_urgent_exts;
|
|
}
|
|
if (list)
|
|
list_move_tail(&ext->oe_link, list);
|
|
unplug = true;
|
|
} else {
|
|
/* the only discarder is lock cancelling, so
|
|
* [start, end] must contain this extent
|
|
*/
|
|
EASSERT(ext->oe_start >= start &&
|
|
ext->oe_max_end <= end, ext);
|
|
osc_extent_state_set(ext, OES_LOCKING);
|
|
ext->oe_owner = current;
|
|
list_move_tail(&ext->oe_link, &discard_list);
|
|
osc_update_pending(obj, OBD_BRW_WRITE,
|
|
-ext->oe_nr_pages);
|
|
}
|
|
break;
|
|
case OES_ACTIVE:
|
|
/* It's pretty bad to wait for ACTIVE extents, because
|
|
* we don't know how long we will wait for it to be
|
|
* flushed since it may be blocked at awaiting more
|
|
* grants. We do this for the correctness of fsync.
|
|
*/
|
|
LASSERT(hp == 0 && discard == 0);
|
|
ext->oe_urgent = 1;
|
|
break;
|
|
case OES_TRUNC:
|
|
/* this extent is being truncated, can't do anything
|
|
* for it now. it will be set to urgent after truncate
|
|
* is finished in osc_cache_truncate_end().
|
|
*/
|
|
default:
|
|
break;
|
|
}
|
|
ext = next_extent(ext);
|
|
}
|
|
osc_object_unlock(obj);
|
|
|
|
LASSERT(ergo(!discard, list_empty(&discard_list)));
|
|
if (!list_empty(&discard_list)) {
|
|
struct osc_extent *tmp;
|
|
int rc;
|
|
|
|
osc_list_maint(osc_cli(obj), obj);
|
|
list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
|
|
list_del_init(&ext->oe_link);
|
|
EASSERT(ext->oe_state == OES_LOCKING, ext);
|
|
|
|
/* Discard caching pages. We don't actually write this
|
|
* extent out but we complete it as if we did.
|
|
*/
|
|
rc = osc_extent_make_ready(env, ext);
|
|
if (unlikely(rc < 0)) {
|
|
OSC_EXTENT_DUMP(D_ERROR, ext,
|
|
"make_ready returned %d\n", rc);
|
|
if (result >= 0)
|
|
result = rc;
|
|
}
|
|
|
|
/* finish the extent as if the pages were sent */
|
|
osc_extent_finish(env, ext, 0, 0);
|
|
}
|
|
}
|
|
|
|
if (unplug)
|
|
osc_io_unplug(env, osc_cli(obj), obj);
|
|
|
|
if (hp || discard) {
|
|
int rc;
|
|
|
|
rc = osc_cache_wait_range(env, obj, start, end);
|
|
if (result >= 0 && rc < 0)
|
|
result = rc;
|
|
}
|
|
|
|
OSC_IO_DEBUG(obj, "cache page out.\n");
|
|
return result;
|
|
}
|
|
|
|
/** @} osc */
|