Viewing: osc_cache.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, 2017, Intel Corporation.
*
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* osc cache management.
*
* Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
*/
#define DEBUG_SUBSYSTEM S_OSC
#include <lustre_osc.h>
#include <lustre_dlm.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,
enum osc_extent_state state);
static void osc_completion(const struct lu_env *env, struct osc_object *osc,
struct osc_async_page *oap, enum cl_req_type crt,
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_object *osc,
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, unsigned int dirty_grant);
static void __osc_extent_tree_dump(int mask, struct osc_object *obj,
const char *func, int line);
#define osc_extent_tree_dump(mask, obj) \
__osc_extent_tree_dump(mask, obj, __func__, __LINE__)
static void osc_unreserve_grant(struct client_obd *cli, unsigned int reserved,
unsigned int unused);
/* OSC */
/* ------------------ osc extent ------------------ */
static inline char *ext_flags(struct osc_extent *ext, char *flags)
{
char *buf = flags;
*buf++ = ext->oe_rw ? 'r' : 'w';
if (!RB_EMPTY_NODE(&ext->oe_node))
*buf++ = 'i';
if (ext->oe_sync)
*buf++ = 'S';
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;
}
#define EXTSTR "[%lu -> %lu/%lu]"
#define EXTPARA(ext) (ext)->oe_start, (ext)->oe_end, (ext)->oe_max_end
static const char *const oes_strings[] = {
"inv", "active", "cache", "locking", "lockdone", "rpc", "trunc", NULL };
#define OSC_EXTENT_DUMP_WITH_LOC(file, func, line, mask, extent, fmt, ...) do {\
static struct cfs_debug_limit_state cdls; \
struct osc_extent *__ext = (extent); \
char __buf[16]; \
\
__CDEBUG_WITH_LOC(file, func, line, mask, &cdls, \
"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 ----- */ \
kref_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_dlmlock, __ext->oe_mppr, __ext->oe_owner, \
/* ----- part 4 ----- */ \
## __VA_ARGS__); \
if (mask == D_ERROR && __ext->oe_dlmlock != NULL) \
LDLM_ERROR(__ext->oe_dlmlock, "extent: %p", __ext); \
else \
LDLM_DEBUG(__ext->oe_dlmlock, "extent: %p", __ext); \
} while (0)
#define OSC_EXTENT_DUMP(mask, ext, fmt, ...) \
OSC_EXTENT_DUMP_WITH_LOC(__FILE__, __func__, __LINE__, \
mask, ext, fmt, ## __VA_ARGS__)
#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)
{
return rb_entry_safe(n, struct osc_extent, oe_node);
}
static inline struct osc_extent *next_extent(struct osc_extent *ext)
{
if (ext == NULL)
return NULL;
LASSERT(!RB_EMPTY_NODE(&ext->oe_node));
return rb_extent(rb_next(&ext->oe_node));
}
static inline struct osc_extent *prev_extent(struct osc_extent *ext)
{
if (ext == NULL)
return NULL;
LASSERT(!RB_EMPTY_NODE(&ext->oe_node));
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_check(struct osc_extent *ext,
const char *func, const int line)
{
struct osc_object *obj = ext->oe_obj;
struct osc_async_page *oap;
size_t page_count;
int rc = 0;
assert_osc_object_is_locked(obj);
if (ext->oe_state >= OES_STATE_MAX)
GOTO(out, rc = 10);
if (kref_read(&ext->oe_refc) <= 0)
GOTO(out, rc = 20);
if (kref_read(&ext->oe_refc) < atomic_read(&ext->oe_users))
GOTO(out, rc = 30);
switch (ext->oe_state) {
case OES_INV:
if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages))
GOTO(out, rc = 35);
GOTO(out, rc = 0);
break;
case OES_ACTIVE:
if (atomic_read(&ext->oe_users) == 0)
GOTO(out, rc = 40);
if (ext->oe_hp)
GOTO(out, rc = 50);
if (ext->oe_fsync_wait && !ext->oe_urgent)
GOTO(out, rc = 55);
break;
case OES_CACHE:
if (ext->oe_grants == 0)
GOTO(out, rc = 60);
if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp)
GOTO(out, rc = 65);
fallthrough;
default:
break;
}
if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start)
GOTO(out, rc = 80);
if (ext->oe_sync && ext->oe_grants > 0)
GOTO(out, rc = 90);
if (ext->oe_dlmlock != NULL &&
ext->oe_dlmlock->l_resource->lr_type == LDLM_EXTENT &&
!ldlm_is_failed(ext->oe_dlmlock)) {
struct ldlm_extent *extent;
extent = &ext->oe_dlmlock->l_policy_data.l_extent;
if (!(extent->start <= ext->oe_start << PAGE_SHIFT &&
extent->end >= ext->oe_max_end << PAGE_SHIFT))
GOTO(out, rc = 100);
if (!(ext->oe_dlmlock->l_granted_mode & (LCK_PW | LCK_GROUP)))
GOTO(out, rc = 102);
}
if (ext->oe_nr_pages > ext->oe_mppr)
GOTO(out, rc = 105);
/* 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)
GOTO(out, rc = 0);
if (!extent_debug)
GOTO(out, rc = 0);
page_count = 0;
list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
pgoff_t index = osc_index(oap2osc(oap));
++page_count;
if (index > ext->oe_end || index < ext->oe_start)
GOTO(out, rc = 110);
}
if (page_count != ext->oe_nr_pages)
GOTO(out, rc = 120);
out:
if (rc != 0)
OSC_EXTENT_DUMP_WITH_LOC(__FILE__, func, line, D_ERROR, ext,
"sanity check %p failed: rc = %d\n",
ext, rc);
return rc;
}
#define sanity_check_nolock(ext) \
__osc_extent_sanity_check(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; \
})
static inline bool
overlapped(const struct osc_extent *ex1, const struct osc_extent *ex2)
{
return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start);
}
/**
* osc_extent_is_overlapped() - Report if no overlapped extent in the tree.
* @obj: Pointer to struct osc_object (all extents)
* @ext: osc_extent that is checked for overlap
*
* sanity check - to make sure there is no overlapped extent in the tree.
*
* Return:
* * %0 no overlap found
* * %1 overlap found
*/
static int osc_extent_is_overlapped(struct osc_object *obj,
struct osc_extent *ext)
{
struct osc_extent *tmp;
assert_osc_object_is_locked(obj);
if (!extent_debug)
return 0;
for (tmp = first_extent(obj); tmp != NULL; tmp = next_extent(tmp)) {
if (tmp == ext)
continue;
if (overlapped(tmp, ext))
return 1;
}
return 0;
}
static void osc_extent_state_set(struct osc_extent *ext, int state)
{
assert_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 */
smp_store_release(&ext->oe_state, state);
wake_up(&ext->oe_waitq);
}
static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
{
struct osc_extent *ext;
OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, GFP_NOFS);
if (ext == NULL)
return NULL;
RB_CLEAR_NODE(&ext->oe_node);
ext->oe_obj = obj;
cl_object_get(osc2cl(obj));
kref_init(&ext->oe_refc);
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_dlmlock = NULL;
return ext;
}
static void osc_extent_free(struct kref *kref)
{
struct osc_extent *ext = container_of(kref, struct osc_extent,
oe_refc);
LASSERT(list_empty(&ext->oe_link));
LASSERT(atomic_read(&ext->oe_users) == 0);
LASSERT(ext->oe_state == OES_INV);
LASSERT(RB_EMPTY_NODE(&ext->oe_node));
if (ext->oe_dlmlock) {
ldlm_lock_put(ext->oe_dlmlock);
ext->oe_dlmlock = NULL;
}
#if 0
/* If/When cl_object_put drops the need for 'env',
* this code can be enabled, and matching code in
* osc_extent_put removed.
*/
cl_object_put(osc2cl(ext->oe_obj));
OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
#endif
}
static struct osc_extent *osc_extent_get(struct osc_extent *ext)
{
LASSERT(kref_read(&ext->oe_refc) >= 0);
kref_get(&ext->oe_refc);
return ext;
}
static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
{
LASSERT(kref_read(&ext->oe_refc) > 0);
if (kref_put(&ext->oe_refc, osc_extent_free)) {
/* This should be in osc_extent_free(), but
* while we need to pass 'env' it cannot be.
*/
cl_object_put(env, osc2cl(ext->oe_obj));
OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
}
}
/**
* osc_extent_put_trust() - Special version of osc_extent_put()
* @ext: osc_extent that is checked to be not the last
*
* 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(kref_read(&ext->oe_refc) > 1);
assert_osc_object_is_locked(ext->oe_obj);
osc_extent_put(NULL, ext);
}
/**
* osc_extent_search() - Return extent having pgoff @index, or return the
* greatest previous extent in the tree.
* @obj: Pointer to struct osc_object (all extents)
* @index: Index to return
*
* 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;
assert_osc_object_is_locked(obj);
while (n != NULL) {
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 != NULL && 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(RB_EMPTY_NODE(&ext->oe_node));
LASSERT(ext->oe_obj == obj);
assert_osc_object_is_locked(obj);
while (*n != NULL) {
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);
}
/* caller must have held object lock. */
static void osc_extent_erase(struct osc_extent *ext)
{
struct osc_object *obj = ext->oe_obj;
assert_osc_object_is_locked(obj);
if (!RB_EMPTY_NODE(&ext->oe_node)) {
rb_erase(&ext->oe_node, &obj->oo_root);
RB_CLEAR_NODE(&ext->oe_node);
/* 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;
assert_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)
{
assert_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);
}
/**
* osc_extent_merge() - merge extents to get better performance.
* @env: Lustre environment
* @cur: Pointer to osc_extent (extent which @victim is being merged too)
* @victim: Pointer to osc_extent (extent which is being merged to @cur)
*
* This function is used to merge extents to get better performance. It checks
* if @cur and @victim are contiguous at block level.
*
* Return:
* * %0 on success
* * %negative on failure
*/
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;
struct client_obd *cli = osc_cli(obj);
pgoff_t chunk_start;
pgoff_t chunk_end;
int ppc_bits;
LASSERT(cur->oe_state == OES_CACHE);
assert_osc_object_is_locked(obj);
if (victim == NULL)
return -EINVAL;
if (victim->oe_state != OES_INV &&
(victim->oe_state != OES_CACHE || victim->oe_fsync_wait))
return -EBUSY;
if (cur->oe_max_end != victim->oe_max_end)
return -ERANGE;
/*
* In the rare case max_pages_per_rpc (mppr) is changed, don't
* merge extents until after old ones have been sent, or the
* "extents are aligned to RPCs" checks are unhappy.
*/
if (cur->oe_mppr != victim->oe_mppr)
return -ERANGE;
LASSERT(cur->oe_dlmlock == victim->oe_dlmlock);
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;
/* overall extent size should not exceed the max supported limit
* reported by the server */
if (cur->oe_end - cur->oe_start + 1 +
victim->oe_end - victim->oe_start + 1 > cli->cl_max_extent_pages)
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);
/* per-extent tax should be accounted only once for the whole extent */
cur->oe_grants += victim->oe_grants - cli->cl_grant_extent_tax;
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);
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;
}
/**
* osc_extent_release() - Drop user count of osc_extent, and unplug IO
* asyncronously.
* @env: Lustre environment
* @ext: Pointer to osc_extent (extent which is being released)
* @prio: priority of IO
*/
void osc_extent_release(const struct lu_env *env, struct osc_extent *ext,
enum cl_io_priority prio)
{
struct osc_object *obj = ext->oe_obj;
struct client_obd *cli = osc_cli(obj);
bool hp = cl_io_high_prio(prio);
ENTRY;
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)) {
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().
*/
if (ext->oe_state != OES_ACTIVE) {
int rc;
osc_object_unlock(obj);
rc = osc_extent_wait(env, ext, OES_INV);
if (rc < 0)
OSC_EXTENT_DUMP(D_ERROR, ext,
"error: %d.\n", rc);
osc_object_lock(obj);
}
osc_extent_state_set(ext, OES_TRUNC);
ext->oe_trunc_pending = 0;
osc_object_unlock(obj);
} else if (ext->oe_state == OES_ACTIVE) {
int grant = 0;
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. */
if (osc_extent_merge(env, ext, prev_extent(ext)) == 0)
grant += cli->cl_grant_extent_tax;
if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
grant += cli->cl_grant_extent_tax;
if (!hp && !ext->oe_rw && ext->oe_dlmlock) {
lock_res_and_lock(ext->oe_dlmlock);
hp = ldlm_is_cbpending(ext->oe_dlmlock);
unlock_res_and_lock(ext->oe_dlmlock);
}
/* HP extent should be written ASAP. */
if (hp)
ext->oe_hp = 1;
if (ext->oe_hp)
list_move_tail(&ext->oe_link,
&obj->oo_hp_exts);
else if (ext->oe_urgent)
list_move_tail(&ext->oe_link,
&obj->oo_urgent_exts);
else if (ext->oe_nr_pages == ext->oe_mppr) {
list_move_tail(&ext->oe_link,
&obj->oo_full_exts);
}
osc_object_unlock(obj);
if (grant > 0)
osc_unreserve_grant(cli, 0, grant);
} else {
osc_object_unlock(obj);
}
if (unlikely(cl_io_high_prio(prio)))
osc_io_unplug(env, cli, obj);
else
osc_io_unplug_async(env, cli, obj);
}
osc_extent_put(env, ext);
RETURN_EXIT;
}
/**
* osc_extent_find() - Find or create an extent which includes @index, core
* function to manage extent tree.
* @env: Lustre environment
* @obj: Pointer to struct osc_object (all extents)
* @index: Page index
* @grants: Used when creating extent
*
* Return:
* * Valid osc_extent poiner on success
* * %negative on failure
*/
static struct osc_extent *osc_extent_find(const struct lu_env *env,
struct osc_object *obj, pgoff_t index,
unsigned int *grants)
{
struct client_obd *cli = osc_cli(obj);
struct osc_lock *olck;
struct cl_lock_descr *descr;
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;
unsigned int max_pages; /* max_pages_per_rpc */
unsigned int chunksize;
int ppc_bits; /* pages per chunk bits */
pgoff_t chunk_mask;
int rc;
ENTRY;
cur = osc_extent_alloc(obj);
if (cur == NULL)
RETURN(ERR_PTR(-ENOMEM));
olck = osc_env_io(env)->oi_write_osclock;
LASSERTF(olck != NULL, "page %lu is not covered by lock\n", index);
LASSERT(olck->ols_state == OLS_GRANTED);
descr = &olck->ols_cl.cls_lock->cll_descr;
LASSERT(descr->cld_mode >= CLM_WRITE);
LASSERTF(cli->cl_chunkbits >= PAGE_SHIFT,
"chunkbits: %u\n", cli->cl_chunkbits);
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. */
max_pages = cli->cl_max_pages_per_rpc_write;
if ((max_pages & ~chunk_mask) != 0) {
CERROR("max_pages: %#x chunkbits: %u chunk_mask: %#lx\n",
max_pages, cli->cl_chunkbits, chunk_mask);
RETURN(ERR_PTR(-EINVAL));
}
max_end = index - (index % max_pages) + max_pages - 1;
max_end = min_t(pgoff_t, max_end, 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 < descr->cld_start)
cur->oe_start = descr->cld_start;
if (cur->oe_end > max_end)
cur->oe_end = max_end;
cur->oe_grants = chunksize + cli->cl_grant_extent_tax;
cur->oe_mppr = max_pages;
if (olck->ols_dlmlock != NULL) {
LASSERT(olck->ols_hold);
cur->oe_dlmlock = ldlm_lock_get(olck->ols_dlmlock);
}
/* grants has been allocated by caller */
LASSERTF(*grants >= chunksize + cli->cl_grant_extent_tax,
"%u/%u/%u.\n", *grants, chunksize, cli->cl_grant_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);
for (; ext; ext = next_extent(ext)) {
pgoff_t ext_chk_start = ext->oe_start >> ppc_bits;
pgoff_t ext_chk_end = ext->oe_end >> ppc_bits;
LASSERT(sanity_check_nolock(ext) == 0);
if (chunk > ext_chk_end + 1 || chunk < ext_chk_start)
break;
/* if covering by different locks, no chance to match */
if (olck->ols_dlmlock != ext->oe_dlmlock) {
EASSERTF(!overlapped(ext, cur), ext,
EXTSTR"\n", EXTPARA(cur));
continue;
}
/* discontiguous chunks? */
if (chunk + 1 < ext_chk_start)
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_hp ||
ext->oe_fsync_wait || ext->oe_memalloc) {
/* for simplicity, we wait for this extent to
* finish before going forward.
* Also wait if oe_memalloc is set, which means
* a page in this extent has been marked
* PG_writeback by osc_flush_async_page() but
* the RPC has not been submitted yet. Holding
* this extent would remove it from the urgent
* list and prevent the RPC from being sent,
* causing a deadlock if the writer later hits
* that PG_writeback page in cl_page_assume(). */
conflict = osc_extent_get(ext);
break;
}
found = osc_extent_hold(ext);
break;
}
/* non-overlapped extent */
if (ext->oe_state != OES_CACHE || ext->oe_hp ||
ext->oe_fsync_wait || ext->oe_memalloc)
/* we can't do anything for a non OES_CACHE extent, or
* if there is someone waiting for this extent to be
* flushed, or if a writeback page is pending RPC
* submission (oe_memalloc), try next one. */
continue;
if (osc_extent_merge(env, ext, cur) == 0) {
LASSERT(*grants >= chunksize);
*grants -= chunksize;
/*
* Try to merge with the next one too because we
* might have just filled in a gap.
*/
if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
/* we can save extent tax from next extent */
*grants += cli->cl_grant_extent_tax;
found = osc_extent_hold(ext);
break;
}
}
osc_extent_tree_dump(D_CACHE, obj);
if (found != NULL) {
LASSERT(conflict == NULL);
if (!IS_ERR(found)) {
LASSERT(found->oe_dlmlock == cur->oe_dlmlock);
OSC_EXTENT_DUMP(D_CACHE, found,
"found caching ext for %lu.\n", index);
}
} else if (conflict == NULL) {
/* create a new extent */
EASSERT(osc_extent_is_overlapped(obj, cur) == 0, cur);
LASSERT(*grants >= cur->oe_grants);
*grants -= cur->oe_grants;
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, descr->cld_end);
}
osc_object_unlock(obj);
if (conflict != NULL) {
LASSERT(found == NULL);
/* 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)
GOTO(out, found = ERR_PTR(rc));
goto restart;
}
EXIT;
out:
osc_extent_put(env, cur);
return found;
}
/**
* osc_extent_finish() - Called when IO is finished to an extent.
* @env: Lustre environment
* @ext: Pointer to osc_extent (extent which is IO finish is called)
* @sent: %True if RPC was dispatched
* @rc: return value of writeback stored under @ext [out]
*
* Return %0 always
*/
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_object *osc = 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;
loff_t last_off = 0;
int last_count = -1;
enum cl_req_type crt;
ENTRY;
if (ext->oe_rw == 0)
crt = CRT_WRITE;
else
crt = CRT_READ;
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);
/* dio pages do not go in the LRU */
if (!ext->oe_dio)
osc_lru_add_batch(cli, &ext->oe_pages);
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_completion(env, osc, oap, crt, rc);
}
EASSERT(ext->oe_nr_pages == 0, ext);
if (!sent) {
lost_grant = ext->oe_grants;
} else if (cli->cl_ocd_grant_param == 0 &&
blocksize < PAGE_SIZE &&
last_count != PAGE_SIZE) {
/* For short writes without OBD_CONNECT_GRANT support, 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 tgt_grant_check.
*/
int offset = last_off & ~PAGE_MASK;
int count = last_count + (offset & (blocksize - 1));
int end = (offset + last_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, ext->oe_grants);
osc_extent_remove(ext);
/* put the refcount for RPC */
osc_extent_put(env, ext);
RETURN(0);
}
/**
* osc_extent_wait() - Wait for the extent's state to become @state.
* @env: Lustre environment
* @ext: Pointer to osc_extent (extent which is being waited for state change)
* @state: Value of OSC state
*
* Return:
* * %0 on success
* * %1 on failure
*/
static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
enum osc_extent_state state)
{
struct osc_object *obj = ext->oe_obj;
int rc = 0;
ENTRY;
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) {
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, IO_PRIO_NORMAL);
/* wait for the extent until its state becomes @state */
rc = wait_event_idle_timeout(ext->oe_waitq,
smp_load_acquire(&ext->oe_state) == state,
cfs_time_seconds(600));
if (rc == 0) {
OSC_EXTENT_DUMP(D_ERROR, ext,
"%s: wait ext to %u timedout, recovery in progress?\n",
cli_name(osc_cli(obj)), state);
wait_event_idle(ext->oe_waitq,
smp_load_acquire(&ext->oe_state) == state);
}
if (ext->oe_rc < 0)
rc = ext->oe_rc;
else
rc = 0;
RETURN(rc);
}
/**
* osc_extent_truncate() - trunacate an extent
* @ext: Pointer to osc_extent (extent which is being truncated)
* @trunc_index: truncate extent beyond @trunc_index
* @partial: If %False truncate is at page boundry. Else it is partial
*
* Discard pages with index greater than @size. If @ext is overlapped with
* @size, then partial truncate happens.
*
* Return:
* * %0 on success
* * %negative on failure
*/
static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
bool partial)
{
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;
struct folio_batch *fbatch;
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;
__u16 refcheck;
ENTRY;
LASSERT(sanity_check(ext) == 0);
LASSERT(ext->oe_state == OES_TRUNC);
LASSERT(!ext->oe_urgent);
/* 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_get(&refcheck);
if (IS_ERR(env))
RETURN(PTR_ERR(env));
io = osc_env_new_io(env);
io->ci_obj = cl_object_top(osc2cl(obj));
io->ci_ignore_layout = 1;
fbatch = &osc_env_info(env)->oti_fbatch;
ll_folio_batch_init(fbatch);
rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
if (rc < 0)
GOTO(out, rc);
/* discard all pages with index greater than trunc_index */
list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
oap_pending_item) {
pgoff_t index = osc_index(oap2osc(oap));
struct cl_page *page = oap2cl_page(oap);
LASSERT(list_empty(&oap->oap_rpc_item));
/* only discard the pages with their index greater than
* trunc_index, and ... */
if (index < trunc_index ||
(index == trunc_index && partial)) {
/* accounting how many pages remaining in the chunk
* so that we can calculate grants correctly. */
if (index >> ppc_bits == trunc_chunk)
++pages_in_chunk;
continue;
}
list_del_init(&oap->oap_pending_item);
cl_page_get(page);
if (cl_page_own(env, io, page) == 0) {
cl_page_discard(env, io, page);
cl_page_disown(env, io, page);
} else {
LASSERT(page->cp_state == CPS_FREEING);
LASSERT(0);
}
cl_batch_put(env, page, fbatch);
--ext->oe_nr_pages;
++nr_pages;
}
folio_batch_release(fbatch);
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, grants);
out:
cl_io_fini(env, io);
cl_env_put(env, &refcheck);
RETURN(rc);
}
/**
* osc_extent_make_ready() - Make the extent prepared for transfer.
* @env: Lustre environment
* @ext: Pointer to osc_extent (extent which is being ready for transfer)
*
* This function is used to make the extent prepared for transfer.
* A race with flusing page - ll_writepage() has to be handled cautiously.
*
* Return:
* * %0 on success
* * %negative on failure
*/
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;
unsigned int page_count = 0;
int rc;
ENTRY;
/* 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 != NULL, 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 == NULL || 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:
oap->oap_async_flags |= ASYNC_READY;
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 != NULL);
/* 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)) {
int last_oap_count = osc_refresh_count(env, obj, last,
OBD_BRW_WRITE);
LASSERTF(last_oap_count > 0,
"last_oap_count %d\n", last_oap_count);
LASSERT(last->oap_page_off + last_oap_count <= PAGE_SIZE);
last->oap_count = last_oap_count;
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);
}
/**
* osc_extent_expand() - Simpilified version of osc_extent_find()
* @ext: Extent to expand
* @index: Page index
* @grants: Used when creating extent
*
* 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.
*
* Return:
* * %0 on success
* * %negative on failure
*/
static int osc_extent_expand(struct osc_extent *ext, pgoff_t index,
unsigned 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;
unsigned int chunksize = 1 << cli->cl_chunkbits;
int rc = 0;
ENTRY;
LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
osc_object_lock(obj);
if (ext->oe_state != OES_ACTIVE)
GOTO(out, rc = -ESTALE);
LASSERT(sanity_check_nolock(ext) == 0);
end_chunk = ext->oe_end >> ppc_bits;
if (chunk > end_chunk + 1)
GOTO(out, rc = -ERANGE);
if (end_chunk >= chunk)
GOTO(out, rc = 0);
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);
/* don't go over the maximum extent size reported by server */
if (end_index - ext->oe_start + 1 > cli->cl_max_extent_pages)
GOTO(out, rc = -ERANGE);
next = next_extent(ext);
if (next != NULL && next->oe_start <= end_index)
/* complex mode - overlapped with the next extent,
* this case will be handled by osc_extent_find() */
GOTO(out, rc = -EAGAIN);
ext->oe_end = end_index;
ext->oe_grants += chunksize;
LASSERT(*grants >= chunksize);
*grants -= chunksize;
EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
"overlapped after expanding for %lu.\n", index);
EXIT;
out:
osc_object_unlock(obj);
RETURN(rc);
}
static void __osc_extent_tree_dump(int mask, struct osc_object *obj,
const char *func, int line)
{
struct osc_extent *ext;
int cnt;
if (!cfs_cdebug_show(mask, DEBUG_SUBSYSTEM))
return;
CDEBUG(mask, "Dump object %p extents at %s:%d, mppr: %u.\n",
obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc_write);
/* osc_object_lock(obj); */
cnt = 1;
for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
OSC_EXTENT_DUMP(mask, ext, "in tree %d.\n", cnt++);
cnt = 1;
list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
OSC_EXTENT_DUMP(mask, ext, "hp %d.\n", cnt++);
cnt = 1;
list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
OSC_EXTENT_DUMP(mask, ext, "urgent %d.\n", cnt++);
cnt = 1;
list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
OSC_EXTENT_DUMP(mask, 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 cl_page *page = oap2cl_page(oap);
int result;
LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
ENTRY;
result = cl_page_make_ready(env, page, CRT_WRITE);
RETURN(result);
}
static int osc_refresh_count(const struct lu_env *env, struct osc_object *osc,
struct osc_async_page *oap, int cmd)
{
struct osc_page *opg = oap2osc_page(oap);
pgoff_t index = osc_index(oap2osc(oap));
struct cl_object *obj = osc2cl(osc);
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));
LASSERT(opg != NULL);
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 (index << PAGE_SHIFT >= kms)
/* catch race with truncate */
return 0;
else if ((index + 1) << PAGE_SHIFT > kms)
/* catch sub-page write at end of file */
return kms & ~PAGE_MASK;
else
return PAGE_SIZE;
}
/* this must be called holding the loi list lock to give coverage to exit_cache,
* async_flag maintenance
*/
static void osc_completion(const struct lu_env *env, struct osc_object *osc,
struct osc_async_page *oap, enum cl_req_type crt,
int rc)
{
struct osc_page *opg = oap2osc_page(oap);
struct cl_page *page = oap2cl_page(oap);
int srvlock;
int cptype = page->cp_type;
ENTRY;
if (cptype != CPT_TRANSIENT) {
/* As the transfer for this page is done, clear the flags */
oap->oap_async_flags = 0;
LASSERTF(equi(page->cp_state == CPS_PAGEIN,
crt == CRT_READ),
"cp_state:%u, crt:%d\n", page->cp_state, crt);
LASSERTF(equi(page->cp_state == CPS_PAGEOUT,
crt == CRT_WRITE),
"cp_state:%u, crt:%d\n", page->cp_state, crt);
LASSERT(opg->ops_transfer_pinned);
/* Clear opg->ops_transfer_pinned before VM lock is released.*/
opg->ops_transfer_pinned = 0;
}
srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
/* statistic */
if (rc == 0 && srvlock) {
struct lu_device *ld = osc->oo_cl.co_lu.lo_dev;
struct osc_stats *stats = &lu2osc_dev(ld)->osc_stats;
size_t 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.
*/
/* for transient pages, the last reference can be destroyed by
* cl_page_complete, so do not reference the page after this
*/
cl_page_complete(env, page, crt, rc);
if (cptype != CPT_TRANSIENT)
cl_page_put(env, page);
EXIT;
return;
}
#define OSC_DUMP_GRANT(mask, cli, fmt, args...) do { \
struct client_obd *__tmp = (cli); \
CDEBUG(mask, "%s: grant { dirty: %ld/%ld dirty_pages: %ld/%lu " \
"dropped: %ld avail: %ld, dirty_grant: %ld, " \
"reserved: %ld, flight: %d } lru {in list: %ld, " \
"left: %ld, waiters: %d }" fmt "\n", \
cli_name(__tmp), \
__tmp->cl_dirty_pages, __tmp->cl_dirty_max_pages, \
atomic_long_read(&obd_dirty_pages), obd_max_dirty_pages, \
__tmp->cl_lost_grant, __tmp->cl_avail_grant, \
__tmp->cl_dirty_grant, \
__tmp->cl_reserved_grant, __tmp->cl_w_in_flight, \
atomic_long_read(&__tmp->cl_lru_in_list), \
atomic_long_read(&__tmp->cl_lru_busy), \
atomic_read(&__tmp->cl_lru_shrinkers), ##args); \
} while (0)
/* caller must hold loi_list_lock */
static void osc_consume_write_grant(struct client_obd *cli,
struct brw_page *pga)
{
LASSERT(!(pga->bp_flag & OBD_BRW_FROM_GRANT));
cli->cl_dirty_pages++;
pga->bp_flag |= OBD_BRW_FROM_GRANT;
CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
PAGE_SIZE, pga, pga->bp_folio);
}
/* 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)
{
ENTRY;
if (!(pga->bp_flag & OBD_BRW_FROM_GRANT)) {
EXIT;
return;
}
pga->bp_flag &= ~OBD_BRW_FROM_GRANT;
atomic_long_dec(&obd_dirty_pages);
cli->cl_dirty_pages--;
EXIT;
}
/**
* osc_reserve_grant() - Reserve grants for IO
* @cli: client side OBD
* @bytes: Grants(memory) to reserve
*
* 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
*
* Return:
* * %0 on success
* * %negative on failure
*/
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;
cli->cl_dirty_grant -= unused - reserved;
} else {
cli->cl_avail_grant += unused;
cli->cl_dirty_grant += reserved - unused;
}
}
static void osc_unreserve_grant_nolock(struct client_obd *cli,
unsigned int reserved,
unsigned int unused)
{
__osc_unreserve_grant(cli, reserved, unused);
if (unused > 0)
osc_wake_cache_waiters(cli);
}
static void osc_unreserve_grant(struct client_obd *cli,
unsigned int reserved, unsigned int unused)
{
spin_lock(&cli->cl_loi_list_lock);
osc_unreserve_grant_nolock(cli, reserved, unused);
spin_unlock(&cli->cl_loi_list_lock);
}
/**
* osc_free_grant() - Free grant after IO is finished or canceled.
* @cli: client side OBD
* @nr_pages: Number of pages involved in IO
* @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. Without OBD_CONNECT_GRANT support and blocksize at OST is less than
* PAGE_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 tgt_grant_check() for details.
* @dirty_grant: grants for dirty pages
*/
static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
unsigned int lost_grant, unsigned int dirty_grant)
{
unsigned long grant;
grant = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
spin_lock(&cli->cl_loi_list_lock);
atomic_long_sub(nr_pages, &obd_dirty_pages);
cli->cl_dirty_pages -= nr_pages;
cli->cl_lost_grant += lost_grant;
cli->cl_dirty_grant -= dirty_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);
spin_unlock(&cli->cl_loi_list_lock);
CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu/%lu\n",
lost_grant, cli->cl_lost_grant,
cli->cl_avail_grant, cli->cl_dirty_pages << PAGE_SHIFT,
cli->cl_dirty_grant);
}
/**
* osc_exit_cache() - Companion to osc_enter_cache()
* @cli: client side OBD
* @oap: Page not part of dirty accounting
*
* 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)
{
spin_lock(&cli->cl_loi_list_lock);
osc_release_write_grant(cli, &oap->oap_brw_page);
spin_unlock(&cli->cl_loi_list_lock);
}
/**
* osc_enter_cache_try() - Try & check if @bytes is availabe for @oap caching
* @cli: client side OBD
* @oap: Page for caching
* @bytes: Grants in bytes required
*
* 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 rc;
OSC_DUMP_GRANT(D_CACHE, cli, "need:%d", bytes);
rc = osc_reserve_grant(cli, bytes);
if (rc < 0)
return 0;
if (cli->cl_dirty_pages < cli->cl_dirty_max_pages) {
if (atomic_long_add_return(1, &obd_dirty_pages) <=
obd_max_dirty_pages) {
osc_consume_write_grant(cli, &oap->oap_brw_page);
rc = 1;
goto out;
} else
atomic_long_dec(&obd_dirty_pages);
}
__osc_unreserve_grant(cli, bytes, bytes);
out:
return rc;
}
#define __wait_event_idle_exclusive_timeout_cmd(wq_head, condition, \
timeout, cmd1, cmd2) \
___wait_event(wq_head, ___wait_cond_timeout(condition), \
TASK_IDLE, 1, timeout, \
cmd1; __ret = schedule_timeout(__ret); cmd2)
#define wait_event_idle_exclusive_timeout_cmd(wq_head, condition, timeout,\
cmd1, cmd2) \
({ \
long __ret = timeout; \
if (!___wait_cond_timeout(condition)) \
__ret = __wait_event_idle_exclusive_timeout_cmd( \
wq_head, condition, timeout, cmd1, cmd2); \
__ret; \
})
/* Following two inlines exist to pass code fragments
* to wait_event_idle_exclusive_timeout_cmd(). Passing
* code fragments as macro args can look confusing, so
* we provide inlines to encapsulate them.
*/
static inline void cli_unlock_and_unplug(const struct lu_env *env,
struct client_obd *cli,
struct osc_async_page *oap)
{
spin_unlock(&cli->cl_loi_list_lock);
osc_io_unplug_async(env, cli, NULL);
CDEBUG(D_CACHE,
"%s: sleeping for cache space for %p\n",
cli_name(cli), oap);
}
static inline void cli_lock_after_unplug(struct client_obd *cli)
{
spin_lock(&cli->cl_loi_list_lock);
}
/**
* osc_enter_cache() - reserve dirty page accounting
* @env: Lustre environment
* @cli: client side OBD
* @osc: pointer to the Lustre client object
* @oap: Page for caching
* @bytes: Grants in bytes required
*
* 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_object *osc, struct osc_async_page *oap,
int bytes)
{
struct lov_oinfo *loi = osc->oo_oinfo;
int rc = -EDQUOT;
int remain;
bool entered = false;
struct obd_device *obd = cli->cl_import->imp_obd;
/* We cannot wait for a long time here since we are holding ldlm lock
* across the actual IO. If no requests complete fast (e.g. due to
* overloaded OST that takes a long time to process everything, we'd
* get evicted if we wait for a normal obd_timeout or some such.
* So we try to wait half the time it would take the client to be
* evicted by server which is half obd_timeout when AT is off
* or at least ldlm_enqueue_min with AT on.
* See LU-13131 */
unsigned long timeout =
cfs_time_seconds(obd_at_off(obd) ?
obd_timeout / 2 :
obd_get_ldlm_enqueue_min(obd) / 2);
ENTRY;
OSC_DUMP_GRANT(D_CACHE, cli, "need:%d", bytes);
spin_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 (CFS_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
cli->cl_dirty_max_pages == 0 ||
cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) {
OSC_DUMP_GRANT(D_CACHE, cli, "forced sync i/o");
GOTO(out, rc = -EDQUOT);
}
/*
* We can wait 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 (other than success) is no avail grants
* and no dirty pages caching, that really means there is no space
* on the OST.
*/
remain = wait_event_idle_exclusive_timeout_cmd(
cli->cl_cache_waiters,
(entered = osc_enter_cache_try(cli, oap, bytes)) ||
(cli->cl_dirty_pages == 0 && cli->cl_w_in_flight == 0),
timeout,
cli_unlock_and_unplug(env, cli, oap),
cli_lock_after_unplug(cli));
if (entered) {
if (remain == timeout)
OSC_DUMP_GRANT(D_CACHE, cli, "granted from cache");
else
OSC_DUMP_GRANT(D_CACHE, cli,
"finally got grant space");
wake_up(&cli->cl_cache_waiters);
rc = 0;
} else if (remain == 0) {
OSC_DUMP_GRANT(D_CACHE, cli,
"timeout, fall back to sync i/o");
osc_extent_tree_dump(D_CACHE, osc);
/* fall back to synchronous I/O */
} else {
OSC_DUMP_GRANT(D_CACHE, cli,
"no grant space, fall back to sync i/o");
wake_up_all(&cli->cl_cache_waiters);
}
EXIT;
out:
spin_unlock(&cli->cl_loi_list_lock);
RETURN(rc);
}
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;
}
/* Check whether all I/O RPC slots are used out by parallel DIO. */
static inline bool osc_full_dio_in_flight(struct client_obd *cli)
{
__u32 rpcs = rpcs_in_flight(cli);
return rpcs >= cli->cl_max_rpcs_in_flight &&
rpcs <= cli->cl_d_in_flight;
}
/* 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;
ENTRY;
/* 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 || test_bit(IMPF_INVALID, cli->cl_import->imp_flags))
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 (waitqueue_active(&cli->cl_cache_waiters)) {
CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
RETURN(1);
}
if (!list_empty(&osc->oo_full_exts)) {
CDEBUG(D_CACHE, "full extent ready, make an RPC\n");
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);
}
if (!list_empty(&osc->oo_hp_read_exts)) {
CDEBUG(D_CACHE, "high prio read request 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 bool osc_makes_hprpc(struct osc_object *obj)
{
return !list_empty(&obj->oo_hp_exts) ||
!list_empty(&obj->oo_hp_read_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;
spin_lock(&cli->cl_loi_list_lock);
is_ready = __osc_list_maint(cli, osc);
spin_unlock(&cli->cl_loi_list_lock);
return is_ready;
}
struct extent_rpc_data {
struct list_head *erd_rpc_list;
unsigned int erd_page_count;
unsigned int erd_max_pages;
unsigned int erd_max_chunks;
unsigned int erd_max_extents;
unsigned int erd_max_io_slots; /* max iov count */
unsigned int erd_io_slots; /* iov used */
};
#define IO_SLOTS(brw) (((size_t)LNET_MAX_IOV * (brw)) >> LNET_MTU_BITS)
#define write_rpc_def(rpclist, cli) \
{ \
.erd_rpc_list = (rpclist), \
.erd_page_count = 0, \
.erd_max_pages = (cli)->cl_max_pages_per_rpc_write, \
.erd_max_chunks = osc_max_write_chunks(cli), \
.erd_max_extents = 256, \
.erd_io_slots = 0, \
.erd_max_io_slots = IO_SLOTS(\
(cli)->cl_import->imp_connect_data.ocd_brw_size), \
}
#define read_rpc_def(rpclist, cli) \
{ \
.erd_rpc_list = (rpclist), \
.erd_page_count = 0, \
.erd_max_pages = (cli)->cl_max_pages_per_rpc_read, \
.erd_max_chunks = UINT_MAX, \
.erd_max_extents = UINT_MAX, \
.erd_io_slots = 0, \
.erd_max_io_slots = IO_SLOTS(\
(cli)->cl_import->imp_connect_data.ocd_brw_size), \
}
static inline unsigned osc_extent_chunks(const struct osc_extent *ext)
{
struct client_obd *cli = osc_cli(ext->oe_obj);
unsigned ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
return (ext->oe_end >> ppc_bits) - (ext->oe_start >> ppc_bits) + 1;
}
static inline bool
can_merge(const struct osc_extent *ext, const struct osc_extent *in_rpc)
{
if (ext->oe_no_merge || in_rpc->oe_no_merge)
return false;
if (ext->oe_srvlock != in_rpc->oe_srvlock)
return false;
if (ext->oe_ndelay != in_rpc->oe_ndelay)
return false;
if (!ext->oe_grants != !in_rpc->oe_grants)
return false;
if (ext->oe_dio != in_rpc->oe_dio)
return false;
/* It's possible to have overlap on DIO */
if (in_rpc->oe_dio && overlapped(ext, in_rpc))
return false;
if (ext->oe_is_rdma_only != in_rpc->oe_is_rdma_only)
return false;
return true;
}
/**
* try_to_add_extent_for_io() - Add extent to RPC
* @cli: client side OBD
* @ext: Pointer to osc_extent (extent which is being added to RPC)
* @data: pointer to struct extent_rpc_data
*
* 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 extent_rpc_data *data)
{
struct osc_extent *tmp;
unsigned int chunk_count;
#if PAGE_SIZE != PTLRPC_BULK_INTEROP_PAGE_SIZE
unsigned int unalign_tax = 0;
#endif
ENTRY;
EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
ext);
OSC_EXTENT_DUMP(D_CACHE, ext, "trying to add this extent\n");
if (data->erd_max_extents == 0)
RETURN(0);
chunk_count = osc_extent_chunks(ext);
EASSERTF(data->erd_page_count != 0 ||
chunk_count <= data->erd_max_chunks, ext,
"The first extent to be fit in a RPC contains %u chunks, "
"which is over the limit %u.\n", chunk_count,
data->erd_max_chunks);
if (chunk_count > data->erd_max_chunks)
RETURN(0);
data->erd_max_pages = max(ext->oe_mppr, data->erd_max_pages);
EASSERTF(data->erd_page_count != 0 ||
ext->oe_nr_pages <= data->erd_max_pages, ext,
"The first extent to be fit in a RPC contains %u pages, "
"which is over the limit %u.\n", ext->oe_nr_pages,
data->erd_max_pages);
if (data->erd_page_count + ext->oe_nr_pages > data->erd_max_pages)
RETURN(0);
#if PAGE_SIZE != PTLRPC_BULK_INTEROP_PAGE_SIZE
/** unaligned extent might needs one more page due split */
if (ext->oe_start != 0)
unalign_tax = 1;
/* check for full bulk size when free bulk 64k IOV remain */
if (data->erd_io_slots + ext->oe_nr_pages + unalign_tax >
data->erd_max_io_slots)
RETURN(0);
#endif
list_for_each_entry(tmp, data->erd_rpc_list, oe_link) {
EASSERT(tmp->oe_owner == current, tmp);
if (!can_merge(ext, tmp))
RETURN(0);
}
data->erd_max_extents--;
data->erd_max_chunks -= chunk_count;
data->erd_page_count += ext->oe_nr_pages;
#if PAGE_SIZE != PTLRPC_BULK_INTEROP_PAGE_SIZE
data->erd_io_slots += ext->oe_nr_pages + unalign_tax;
#endif
list_move_tail(&ext->oe_link, data->erd_rpc_list);
ext->oe_owner = current;
RETURN(1);
}
/**
* get_write_extents() - Prepare pages that will be attached to RPC
* @obj: Pointer to struct osc_object (all extents)
* @rpclist: List of extents that will be write RPC
*
* 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.
*
* Return IO page count
*/
static unsigned int get_write_extents(struct osc_object *obj,
struct list_head *rpclist)
{
struct client_obd *cli = osc_cli(obj);
struct osc_extent *ext;
struct extent_rpc_data data = write_rpc_def(rpclist, cli);
assert_osc_object_is_locked(obj);
while ((ext = list_first_entry_or_null(&obj->oo_hp_exts,
struct osc_extent,
oe_link)) != NULL) {
if (!try_to_add_extent_for_io(cli, ext, &data))
return data.erd_page_count;
EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
}
if (data.erd_page_count == data.erd_max_pages)
return data.erd_page_count;
while ((ext = list_first_entry_or_null(&obj->oo_urgent_exts,
struct osc_extent,
oe_link)) != NULL) {
if (!try_to_add_extent_for_io(cli, ext, &data))
return data.erd_page_count;
}
if (data.erd_page_count == data.erd_max_pages)
return data.erd_page_count;
/* One key difference between full extents and other extents: full
* extents can usually only be added if the rpclist was empty, so if we
* can't add one, we continue on to trying to add normal extents. This
* is so we don't miss adding extra extents to an RPC containing high
* priority or urgent extents.
*/
while ((ext = list_first_entry_or_null(&obj->oo_full_exts,
struct osc_extent,
oe_link)) != NULL) {
if (!try_to_add_extent_for_io(cli, ext, &data))
break;
}
if (data.erd_page_count == data.erd_max_pages)
return data.erd_page_count;
for (ext = first_extent(obj);
ext;
ext = next_extent(ext)) {
if ((ext->oe_state != OES_CACHE) ||
/* this extent may be already in current rpclist */
(!list_empty(&ext->oe_link) && ext->oe_owner))
continue;
if (!try_to_add_extent_for_io(cli, ext, &data))
return data.erd_page_count;
}
return data.erd_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;
unsigned int page_count = 0;
int srvlock = 0;
int rc = 0;
ENTRY;
assert_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 == NULL) {
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);
}
static unsigned int get_read_extents(struct osc_object *obj,
struct list_head *rpclist)
{
struct client_obd *cli = osc_cli(obj);
struct osc_extent *ext;
struct osc_extent *next;
struct extent_rpc_data data = read_rpc_def(rpclist, cli);
assert_osc_object_is_locked(obj);
while ((ext = list_first_entry_or_null(&obj->oo_hp_read_exts,
struct osc_extent,
oe_link)) != NULL) {
EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
if (!try_to_add_extent_for_io(cli, ext, &data))
return data.erd_page_count;
osc_extent_state_set(ext, OES_RPC);
EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
}
if (data.erd_page_count == data.erd_max_pages)
return data.erd_page_count;
list_for_each_entry_safe(ext, next, &obj->oo_reading_exts, oe_link) {
EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
if (!try_to_add_extent_for_io(cli, ext, &data))
break;
osc_extent_state_set(ext, OES_RPC);
EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
}
LASSERT(data.erd_page_count <= data.erd_max_pages);
return data.erd_page_count;
}
/**
* osc_send_read_rpc() - prepare pages for ASYNC io and put pages in send queue.
* @env: Lustre environment
* @cli: client side OBD
* @osc: pointer to the Lustre client object
*
* \param cmd OBD_BRW_* macroses
* \param lop pending pages
*
* Return:
* * %0 if no page added to send queue.
* * %1 if pages successfully added to send queue.
* * %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)
{
LIST_HEAD(rpclist);
unsigned int page_count;
int rc = 0;
ENTRY;
assert_osc_object_is_locked(osc);
page_count = get_read_extents(osc, &rpclist);
osc_update_pending(osc, OBD_BRW_READ, -page_count);
if (!list_empty(&rpclist)) {
osc_object_unlock(osc);
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)
{
ENTRY;
/* 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 threshhold
*/
if (waitqueue_active(&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 ||
test_bit(IMPF_INVALID, cli->cl_import->imp_flags)) {
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;
ENTRY;
while ((osc = osc_next_obj(cli)) != NULL) {
struct cl_object *obj = osc2cl(osc);
OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
/* even if we have reached our max in flight RPCs, we still
* allow all high-priority RPCs through to prevent their
* starvation and leading to server evicting us for not
* writing out pages in a timely manner LU-13131 */
if (osc_max_rpc_in_flight(cli, osc) &&
list_empty(&osc->oo_hp_exts) &&
list_empty(&osc->oo_hp_read_exts)) {
__osc_list_maint(cli, osc);
break;
}
cl_object_get(obj);
spin_unlock(&cli->cl_loi_list_lock);
/* 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);
cl_object_put(env, obj);
spin_lock(&cli->cl_loi_list_lock);
}
EXIT;
}
int __osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
struct osc_object *osc, int async)
{
int rc = 0;
if (osc != NULL && osc_list_maint(cli, osc) == 0)
return 0;
if (!async) {
spin_lock(&cli->cl_loi_list_lock);
osc_check_rpcs(env, cli);
spin_unlock(&cli->cl_loi_list_lock);
} else {
CDEBUG(D_CACHE, "Queue writeback work for client %p.\n", cli);
schedule_work(&cli->cl_writeback_work);
rc = 0;
}
return rc;
}
EXPORT_SYMBOL(__osc_io_unplug);
int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
struct cl_page *page, loff_t offset)
{
struct osc_async_page *oap = &ops->ops_oap;
ENTRY;
if (!page)
return round_up(sizeof(*oap), 8);
oap->oap_obj = osc;
oap->oap_brw_page.bp_folio = page_folio(page->cp_vmpage);
oap->oap_brw_page.bp_pgno = cl_folio_pgno(page);
oap->oap_obj_off = offset;
LASSERT(!(offset & ~PAGE_MASK));
/* Count of transient (direct i/o) pages is always stable by the time
* they're submitted. Setting this here lets us avoid calling
* cl_page_clip later to set this.
*/
if (page->cp_type == CPT_TRANSIENT)
oap->oap_async_flags |= ASYNC_COUNT_STABLE|ASYNC_URGENT|
ASYNC_READY;
INIT_LIST_HEAD(&oap->oap_pending_item);
INIT_LIST_HEAD(&oap->oap_rpc_item);
CDEBUG(D_INFO, "oap %p folio %p pg:%d obj off %llu\n",
oap, oap->oap_brw_page.bp_folio, oap->oap_brw_page.bp_pgno,
oap->oap_obj_off);
RETURN(0);
}
EXPORT_SYMBOL(osc_prep_async_page);
int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
struct osc_object *osc, struct osc_page *ops,
cl_commit_cbt cb)
{
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 = osc_cli(osc);
struct folio_batch *fbatch = &osc_env_info(env)->oti_fbatch;
pgoff_t index;
unsigned int tmp;
unsigned int grants = 0;
u32 brw_flags = OBD_BRW_ASYNC;
int cmd = OBD_BRW_WRITE;
int need_release = 0;
int rc = 0;
ENTRY;
if (!cli->cl_import ||
test_bit(IMPF_INVALID, cli->cl_import->imp_flags))
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 (io->ci_noquota) {
brw_flags |= OBD_BRW_NOQUOTA;
cmd |= OBD_BRW_NOQUOTA;
}
if (oio->oi_cap_sys_resource) {
brw_flags |= OBD_BRW_SYS_RESOURCE;
cmd |= OBD_BRW_SYS_RESOURCE;
}
/* check if the file's owner/group is over quota */
/* do not check for root without root squash, because in this case
* we should bypass quota
*/
if ((!oio->oi_cap_sys_resource ||
cli->cl_root_squash || cli->cl_root_prjquota) &&
!io->ci_noquota) {
struct cl_object *obj;
struct cl_attr *attr;
unsigned int qid[LL_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;
qid[PRJQUOTA] = attr->cat_projid;
if (rc == 0 && osc_quota_chkdq(cli, qid) == -EDQUOT)
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 + 1;
/* No need to hold a lock here,
* since this page is not in any list yet. */
oap->oap_async_flags = 0;
oap->oap_brw_flags = brw_flags;
oap->oap_brw_page.bp_pgno = cl_folio_pgno(ops->ops_cl.cpl_page);
OSC_IO_DEBUG(osc, "oap %p folio %p pg:%d added for cmd %d\n",
oap, oap->oap_brw_page.bp_folio,
oap->oap_brw_page.bp_pgno, oap->oap_cmd & OBD_BRW_RWMASK);
index = osc_index(oap2osc(oap));
/* 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 accomodate this page;
* 2. otherwise, a new extent will be allocated. */
ext = oio->oi_active;
if (ext != NULL && ext->oe_state != OES_ACTIVE) {
need_release = 1;
} else if (ext != NULL && 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_grant_extent_tax;
if (ext->oe_end >= index)
grants = 0;
/* it doesn't need any grant to dirty this page */
spin_lock(&cli->cl_loi_list_lock);
rc = osc_enter_cache_try(cli, oap, grants);
if (rc == 0) { /* try failed */
grants = 0;
need_release = 1;
} else if (ext->oe_end < index) {
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_nolock(cli, grants, tmp);
grants = 0;
}
}
spin_unlock(&cli->cl_loi_list_lock);
rc = 0;
} else if (ext != NULL) {
/* index is located outside of active extent */
need_release = 1;
}
if (need_release) {
osc_extent_release(env, ext, IO_PRIO_NORMAL);
oio->oi_active = NULL;
ext = NULL;
}
if (ext == NULL) {
tmp = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
/* try to find new extent to cover this page */
LASSERT(oio->oi_active == NULL);
/* 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;
/* We must not hold a page lock while we do osc_enter_cache()
* or osc_extent_find(), so we must mark dirty & unlock
* any pages in the write commit folio_batch.
*/
if (folio_batch_count(fbatch)) {
cb(env, io, fbatch);
folio_batch_reinit(fbatch);
}
if (grants == 0) {
rc = osc_enter_cache(env, cli, osc, oap, tmp);
if (rc == 0)
grants = tmp;
}
restart_find:
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 != NULL));
if (ext != NULL) {
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_state != OES_ACTIVE) {
if (ext->oe_state == OES_CACHE) {
osc_extent_state_set(ext, OES_ACTIVE);
osc_update_pending(osc, OBD_BRW_WRITE,
-ext->oe_nr_pages);
list_del_init(&ext->oe_link);
} else {
osc_object_unlock(osc);
osc_extent_get(ext);
osc_extent_release(env, ext, IO_PRIO_NORMAL);
oio->oi_active = NULL;
/* Waiting for IO finished. */
rc = osc_extent_wait(env, ext, OES_INV);
osc_extent_put(env, ext);
if (rc < 0)
RETURN(rc);
GOTO(restart_find, rc);
}
}
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);
if (!ext->oe_layout_version)
ext->oe_layout_version = io->ci_layout_version;
}
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;
int rc = 0;
ENTRY;
CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
oap, ops, osc_index(oap2osc(oap)));
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)) {
struct osc_extent *ext = NULL;
osc_object_lock(obj);
ext = osc_extent_lookup(obj, osc_index(oap2osc(oap)));
osc_object_unlock(obj);
/* only truncated pages are allowed to be taken out.
* See osc_extent_truncate() and osc_cache_truncate_start()
* for details. */
if (ext != NULL && ext->oe_state != OES_TRUNC) {
OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
osc_index(oap2osc(oap)));
rc = -EBUSY;
}
if (ext != NULL)
osc_extent_put(env, ext);
}
RETURN(rc);
}
int osc_queue_dio_pages(const struct lu_env *env, struct cl_io *io,
struct osc_object *obj, struct cl_dio_pages *cdp,
struct list_head *list, int from_page, int to_page,
int brw_flags)
{
struct client_obd *cli = osc_cli(obj);
struct osc_io *oio = osc_env_io(env);
struct osc_async_page *oap;
struct osc_extent *ext;
struct osc_lock *oscl;
struct cl_page *page;
struct osc_page *opg;
pgoff_t cdp_index = cdp->cdp_osc_off >> PAGE_SHIFT;
int page_count = to_page - from_page + 1;
int mppr = brw_flags & OBD_BRW_READ ? cli->cl_max_pages_per_rpc_read :
cli->cl_max_pages_per_rpc_write;
pgoff_t start = CL_PAGE_EOF;
bool can_merge = true;
enum cl_req_type crt;
pgoff_t end = 0;
int i;
ENTRY;
if (brw_flags & OBD_BRW_READ)
crt = CRT_READ;
else
crt = CRT_WRITE;
/* we should never have more pages than can fit in an RPC, but if we do
* we must allow sending of a larger RPC
*/
while (page_count > mppr)
mppr = mppr << 1;
if (unlikely(cdp->cdp_from > 0 || cdp->cdp_to < PAGE_SIZE - 1))
can_merge = false;
start = cdp_index + from_page;
end = cdp_index + to_page;
ext = osc_extent_alloc(obj);
if (ext == NULL) {
for (i = from_page; i <= to_page; i++) {
page = cdp->cdp_cl_pages[i];
opg = osc_cl_page_osc(page, obj);
oap = &opg->ops_oap;
list_del_init(&oap->oap_pending_item);
osc_completion(env, obj, oap, crt, -ENOMEM);
}
RETURN(-ENOMEM);
}
ext->oe_rw = !!(brw_flags & OBD_BRW_READ);
ext->oe_sync = 1;
ext->oe_no_merge = !can_merge;
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_ndelay = !!(brw_flags & OBD_BRW_NDELAY);
ext->oe_dio = true;
if (ext->oe_dio) {
struct cl_sync_io *anchor;
struct cl_page *clpage;
oap = list_first_entry(list, struct osc_async_page,
oap_pending_item);
clpage = oap2cl_page(oap);
LASSERT(clpage->cp_type == CPT_TRANSIENT);
anchor = clpage->cp_sync_io;
ext->oe_csd = anchor->csi_dio_aio;
}
oscl = oio->oi_write_osclock ? : oio->oi_read_osclock;
if (oscl && oscl->ols_dlmlock != NULL)
ext->oe_dlmlock = ldlm_lock_get(oscl->ols_dlmlock);
if (!ext->oe_rw) { /* direct io write */
int grants;
int ppc;
ppc = 1 << (cli->cl_chunkbits - PAGE_SHIFT);
grants = cli->cl_grant_extent_tax;
grants += (1 << cli->cl_chunkbits) *
((page_count + ppc - 1) / ppc);
CDEBUG(D_CACHE, "requesting %d bytes grant\n", grants);
spin_lock(&cli->cl_loi_list_lock);
if (osc_reserve_grant(cli, grants) == 0) {
for (i = from_page; i <= to_page; i++) {
page = cdp->cdp_cl_pages[i];
opg = osc_cl_page_osc(page, obj);
oap = &opg->ops_oap;
osc_consume_write_grant(cli,
&oap->oap_brw_page);
}
atomic_long_add(page_count, &obd_dirty_pages);
osc_unreserve_grant_nolock(cli, grants, 0);
ext->oe_grants = grants;
} else {
/* We cannot report ENOSPC correctly if we do parallel
* DIO (async RPC submission), so turn off parallel dio
* if there is not sufficient grant available. This
* makes individual RPCs synchronous.
*/
io->ci_parallel_dio = false;
CDEBUG(D_CACHE,
"not enough grant available, switching to sync for this i/o\n");
}
spin_unlock(&cli->cl_loi_list_lock);
osc_update_next_shrink(cli);
}
ext->oe_is_rdma_only = !!(brw_flags & OBD_BRW_RDMA_ONLY);
ext->oe_nr_pages = page_count;
ext->oe_mppr = mppr;
list_splice_init(list, &ext->oe_pages);
ext->oe_layout_version = io->ci_layout_version;
osc_object_lock(obj);
/* Reuse the initial refcount for RPC, don't drop it */
osc_extent_state_set(ext, OES_LOCK_DONE);
if (!ext->oe_rw) { /* 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);
}
int osc_queue_sync_pages(const struct lu_env *env, struct cl_io *io,
struct osc_object *obj, struct list_head *list,
int brw_flags)
{
struct osc_io *oio = osc_env_io(env);
struct client_obd *cli = osc_cli(obj);
struct osc_extent *ext;
struct osc_async_page *oap;
int page_count = 0;
int mppr = brw_flags & OBD_BRW_READ ? cli->cl_max_pages_per_rpc_read :
cli->cl_max_pages_per_rpc_write;
bool can_merge = true;
pgoff_t start = CL_PAGE_EOF;
pgoff_t end = 0;
enum cl_req_type crt;
ENTRY;
if (brw_flags & OBD_BRW_READ)
crt = CRT_READ;
else
crt = CRT_WRITE;
list_for_each_entry(oap, list, oap_pending_item) {
struct osc_page *opg = oap2osc_page(oap);
pgoff_t index = osc_index(opg);
if (index > end)
end = index;
if (index < start)
start = index;
++page_count;
mppr <<= (page_count > mppr);
if (unlikely(opg->ops_from > 0 ||
opg->ops_to < PAGE_SIZE - 1))
can_merge = false;
}
ext = osc_extent_alloc(obj);
if (ext == NULL) {
struct osc_async_page *tmp;
list_for_each_entry_safe(oap, tmp, list, oap_pending_item) {
list_del_init(&oap->oap_pending_item);
osc_completion(env, obj, oap, crt, -ENOMEM);
}
RETURN(-ENOMEM);
}
ext->oe_rw = !!(brw_flags & OBD_BRW_READ);
ext->oe_sync = 1;
ext->oe_no_merge = !can_merge;
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_ndelay = !!(brw_flags & OBD_BRW_NDELAY);
ext->oe_dio = !!(brw_flags & OBD_BRW_NOCACHE);
if (ext->oe_dio) {
struct cl_sync_io *anchor;
struct cl_page *clpage;
oap = list_first_entry(list, struct osc_async_page,
oap_pending_item);
clpage = oap2cl_page(oap);
LASSERT(clpage->cp_type == CPT_TRANSIENT);
anchor = clpage->cp_sync_io;
ext->oe_csd = anchor->csi_dio_aio;
}
if (ext->oe_dio && !ext->oe_rw) { /* direct io write */
int grants;
int ppc;
ppc = 1 << (cli->cl_chunkbits - PAGE_SHIFT);
grants = cli->cl_grant_extent_tax;
grants += (1 << cli->cl_chunkbits) *
((page_count + ppc - 1) / ppc);
CDEBUG(D_CACHE, "requesting %d bytes grant\n", grants);
spin_lock(&cli->cl_loi_list_lock);
if (osc_reserve_grant(cli, grants) == 0 &&
cli->cl_dirty_pages + page_count <
cli->cl_dirty_max_pages) {
list_for_each_entry(oap, list, oap_pending_item) {
osc_consume_write_grant(cli,
&oap->oap_brw_page);
}
atomic_long_add(page_count, &obd_dirty_pages);
osc_unreserve_grant_nolock(cli, grants, 0);
ext->oe_grants = grants;
} else {
/* We cannot report ENOSPC correctly if we do parallel
* DIO (async RPC submission), so turn off parallel dio
* if there is not sufficient grant or dirty pages
* available. This makes individual RPCs synchronous.
*/
io->ci_parallel_dio = false;
CDEBUG(D_CACHE,
"not enough grant or dirty pages available, switching to sync for this i/o\n");
}
spin_unlock(&cli->cl_loi_list_lock);
osc_update_next_shrink(cli);
}
ext->oe_is_rdma_only = !!(brw_flags & OBD_BRW_RDMA_ONLY);
ext->oe_nr_pages = page_count;
ext->oe_mppr = mppr;
list_splice_init(list, &ext->oe_pages);
ext->oe_layout_version = io->ci_layout_version;
osc_object_lock(obj);
/* Reuse the initial refcount for RPC, don't drop it */
osc_extent_state_set(ext, OES_LOCK_DONE);
if (!ext->oe_rw) { /* write */
if (!ext->oe_srvlock && !ext->oe_dio) {
/* The most likely case here is from lack of grants
* so we are either out of quota or out of space.
* Since this means we are holding locks across
* potentially multi-striped IO, we must send out
* everything out instantly to avoid prolonged
* waits resulting in lock eviction (likely since
* the extended wait in osc_cache_enter() did not
* yield any additional grant due to a timeout.
* LU-13131 */
ext->oe_hp = 1;
list_add_tail(&ext->oe_link, &obj->oo_hp_exts);
} else {
list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
}
osc_update_pending(obj, OBD_BRW_WRITE, page_count);
} else {
bool hp_read = false;
struct ldlm_lock *dlmlock;
struct osc_lock *oscl;
/*
* The DLM extent lock is under blocking AST, and make
* this I/O with high priority.
*/
oscl = oio->oi_read_osclock ? : oio->oi_write_osclock;
dlmlock = oscl ? oscl->ols_dlmlock : NULL;
if (dlmlock == NULL && !ext->oe_srvlock) {
CDEBUG(D_CACHE,
"NOLCK: io %pK "EXTSTR" dio: %d srvlock: %d\n",
io, EXTPARA(ext), ext->oe_dio, ext->oe_srvlock);
}
if (!ext->oe_srvlock && dlmlock != NULL) {
lock_res_and_lock(dlmlock);
hp_read = ldlm_is_cbpending(dlmlock);
unlock_res_and_lock(dlmlock);
if (hp_read)
CDEBUG(D_CACHE,
"HP read: io %pK ext@%pK "EXTSTR"\n",
io, ext, EXTPARA(ext));
}
if (hp_read)
list_add_tail(&ext->oe_link, &obj->oo_hp_read_exts);
else
list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
osc_update_pending(obj, OBD_BRW_READ, page_count);
}
OSC_EXTENT_DUMP(D_CACHE, ext, "allocate ext: rw=%d\n", ext->oe_rw);
osc_object_unlock(obj);
osc_io_unplug_async(env, cli, obj);
RETURN(0);
}
/**
* osc_cache_truncate_start() - Called by osc_io_setattr_start() to freeze and
* destroy covering extents.
* @env: Lustre environment
* @obj: Pointer to struct osc_object (all extents)
* @size: Size in bytes to truncate
* @extp: Exptent that needs to be truncated [out]
*
* Return:
* * %0 on sucess
* * %negative on failure
*/
int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
__u64 size, struct osc_extent **extp)
{
struct client_obd *cli = osc_cli(obj);
struct osc_extent *ext;
struct osc_extent *waiting = NULL;
pgoff_t index;
LIST_HEAD(list);
int result = 0;
bool partial;
ENTRY;
/* pages with index greater or equal to index will be truncated. */
index = size >> PAGE_SHIFT;
partial = size > (index << PAGE_SHIFT);
again:
osc_object_lock(obj);
ext = osc_extent_search(obj, index);
if (ext == NULL)
ext = first_extent(obj);
else if (ext->oe_end < index)
ext = next_extent(ext);
while (ext != NULL) {
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. */
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);
}
/* This extent could be on the full extents list, that's OK */
if (!list_empty(&ext->oe_link))
list_move_tail(&ext->oe_link, &list);
else
list_add_tail(&ext->oe_link, &list);
ext = next_extent(ext);
}
osc_object_unlock(obj);
osc_list_maint(cli, obj);
while ((ext = list_first_entry_or_null(&list,
struct osc_extent,
oe_link)) != NULL) {
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.
* Only partial truncate can reach here, if @size is
* not zero, the caller should provide a valid @extp. */
LASSERT(*extp == NULL);
*extp = osc_extent_get(ext);
OSC_EXTENT_DUMP(D_CACHE, ext,
"trunc at %llu\n", size);
}
osc_extent_put(env, ext);
}
if (waiting != NULL) {
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);
}
EXPORT_SYMBOL(osc_cache_truncate_start);
/**
* osc_cache_truncate_end() - Called after osc_io_setattr_end to add
* oio->oi_trunc back to cache.
* @env: Lustre environment
* @ext: Pointer to osc_extent (extent which is being truncated)
*/
void osc_cache_truncate_end(const struct lu_env *env, struct osc_extent *ext)
{
if (ext != NULL) {
struct osc_object *obj = ext->oe_obj;
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);
}
}
/**
* osc_cache_wait_range() - Wait for extents in specific range to be written out
* @env: Lustre environment
* @obj: pointer to the Lustre client object
* @start: Start index
* @end: End index
*
* 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.
*
* Return:
* * %0 on sucess
* * %negative on failure
*/
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;
ENTRY;
again:
osc_object_lock(obj);
ext = osc_extent_search(obj, index);
if (ext == NULL)
ext = first_extent(obj);
else if (ext->oe_end < index)
ext = next_extent(ext);
while (ext != NULL) {
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);
}
EXPORT_SYMBOL(osc_cache_wait_range);
/**
* osc_cache_writeback_range() - Called to write out a range of osc object.
* @env: Lustre environment
* @obj: pointer to the Lustre client object
* @start: Start index
* @end: End index
* @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.
* @prio: priority of IO
*
* Return how many pages will be issued, or %-ERRNO 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,
enum cl_io_priority prio)
{
struct osc_extent *ext;
LIST_HEAD(discard_list);
bool active_ext_check = false;
bool unplug = false;
int result = 0;
ENTRY;
repeat:
osc_object_lock(obj);
ext = osc_extent_search(obj, start);
if (ext == NULL)
ext = first_extent(obj);
else if (ext->oe_end < start)
ext = next_extent(ext);
while (ext != NULL) {
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 (ext->oe_hp) {
/*
* The extent is already added into HP
* list.
* Another thread has already written
* back the extent with high priority.
*/
unplug = true;
break;
} else if (hp) {
ext->oe_hp = 1;
list = &obj->oo_hp_exts;
} else if (!ext->oe_urgent && !ext->oe_hp) {
ext->oe_urgent = 1;
list = &obj->oo_urgent_exts;
}
if (list != NULL)
list_move_tail(&ext->oe_link, list);
unplug = true;
} else {
struct client_obd *cli = osc_cli(obj);
int pcc_bits = cli->cl_chunkbits - PAGE_SHIFT;
pgoff_t align_by = (1 << pcc_bits);
pgoff_t a_start = round_down(start, align_by);
pgoff_t a_end = round_up(end, align_by);
/* overflow case */
if (end && !a_end)
a_end = CL_PAGE_EOF;
/* the only discarder is lock cancelling, so
* [start, end], aligned by chunk size, must
* contain this extent */
LASSERTF(ext->oe_start >= a_start &&
ext->oe_end <= a_end,
"ext [%lu, %lu] reg [%lu, %lu] "
"orig [%lu %lu] align %lu bits "
"%d\n", ext->oe_start, ext->oe_end,
a_start, a_end, start, end,
align_by, pcc_bits);
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;
if (active_ext_check) {
osc_extent_state_set(ext, OES_CACHE);
list_move_tail(&ext->oe_link,
&obj->oo_urgent_exts);
osc_update_pending(obj, OBD_BRW_WRITE,
ext->oe_nr_pages);
unplug = true;
}
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, "pageout [%lu, %lu] npages %lu: rc=%d.\n",
start, end, obj->oo_npages, result);
/*
* Try to flush the active I/O extents of the object.
* Otherwise, the user process writing the file may be dirty exceeded
* and waiting endless in balance_dirty_pages().
*/
if (result == 0 && prio == IO_PRIO_DIRTY_EXCEEDED &&
!active_ext_check && atomic_read(&obj->oo_nr_ios) &&
obj->oo_npages > 0) {
osc_extent_tree_dump(D_CACHE, obj);
active_ext_check = true;
GOTO(repeat, result);
}
RETURN(result);
}
EXPORT_SYMBOL(osc_cache_writeback_range);
/**
* osc_page_gang_lookup() - loop over group(gang) of pages and check for locks
* or discard them
* @env: Lustre environment
* @io: client IO context
* @osc: pointer to the Lustre client object
* @start: Start index
* @end: End index
* @cb: callback function
* @cbdata: Data for callback
*
* Gang tree lookup (radix_tree_gang_lookup()) optimization is absolutely
* crucial in the face of [offset, EOF] locks.
*
* Return:
* * list of pages by a given [start, end] of @obj.
* * at least one page in @queue unless there is no covered page.
*/
bool 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)
{
struct osc_page *ops;
struct folio_batch *fbatch;
void **pvec;
pgoff_t idx;
unsigned int nr;
unsigned int i;
unsigned int j;
bool res = true;
bool tree_lock = true;
ENTRY;
idx = start;
pvec = osc_env_info(env)->oti_pvec;
fbatch = &osc_env_info(env)->oti_fbatch;
ll_folio_batch_init(fbatch);
spin_lock(&osc->oo_tree_lock);
while ((nr = radix_tree_gang_lookup(&osc->oo_tree, pvec,
idx, OTI_PVEC_SIZE)) > 0) {
struct cl_page *page;
bool end_of_region = false;
for (i = 0, j = 0; i < nr; ++i) {
ops = pvec[i];
pvec[i] = NULL;
idx = osc_index(ops);
if (idx > end) {
end_of_region = true;
break;
}
page = ops->ops_cl.cpl_page;
LASSERT(page->cp_type == CPT_CACHEABLE);
if (page->cp_state == CPS_FREEING)
continue;
cl_page_get(page);
pvec[j++] = ops;
}
/*
* Here a delicate locking dance is performed. Current thread
* holds a reference to a page, but has to own it before it
* can be placed into queue. Owning implies waiting, so
* radix-tree lock is to be released. After a wait one has to
* check that pages weren't truncated (cl_page_own() returns
* error in the latter case).
*/
spin_unlock(&osc->oo_tree_lock);
tree_lock = false;
res = (*cb)(env, io, pvec, j, cbdata);
for (i = 0; i < j; ++i) {
ops = pvec[i];
page = ops->ops_cl.cpl_page;
cl_batch_put(env, page, fbatch);
}
folio_batch_release(fbatch);
if (nr < OTI_PVEC_SIZE || end_of_region)
break;
if (!res)
break;
CFS_FAIL_TIMEOUT(OBD_FAIL_OSC_SLOW_PAGE_EVICT,
cfs_fail_val ?: 20);
if (io->ci_type == CIT_MISC &&
io->u.ci_misc.lm_next_rpc_time &&
ktime_get_seconds() > io->u.ci_misc.lm_next_rpc_time) {
osc_send_empty_rpc(osc, idx << PAGE_SHIFT);
io->u.ci_misc.lm_next_rpc_time = ktime_get_seconds() +
5 * obd_timeout / 16;
}
if (need_resched())
cond_resched();
++idx;
spin_lock(&osc->oo_tree_lock);
tree_lock = true;
}
if (tree_lock)
spin_unlock(&osc->oo_tree_lock);
RETURN(res);
}
EXPORT_SYMBOL(osc_page_gang_lookup);
/*
* Check if page @page is covered by an extra lock or discard it.
*/
static bool check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
void **pvec, int count, void *cbdata)
{
struct osc_thread_info *info = osc_env_info(env);
struct osc_object *osc = cbdata;
int i;
for (i = 0; i < count; i++) {
struct osc_page *ops = pvec[i];
struct cl_page *page = ops->ops_cl.cpl_page;
pgoff_t index = osc_index(ops);
bool discard = false;
/* negative lock caching */
if (index < info->oti_ng_index) {
discard = true;
} else if (index >= info->oti_fn_index) {
struct ldlm_lock *tmp;
/* refresh non-overlapped index */
tmp = osc_dlmlock_at_pgoff(env, osc, index,
OSC_DAP_FL_TEST_LOCK |
OSC_DAP_FL_AST |
OSC_DAP_FL_RIGHT);
if (tmp != NULL) {
__u64 end =
tmp->l_policy_data.l_extent.end;
__u64 start =
tmp->l_policy_data.l_extent.start;
/* no lock covering this page */
if (index < start >> PAGE_SHIFT) {
/* no lock at @index,
* first lock at @start
*/
info->oti_ng_index =
start >> PAGE_SHIFT;
discard = true;
} else {
/* Cache the first-non-overlapped
* index so as to skip all pages
* within [index, oti_fn_index).
* This is safe because if tmp lock
* is canceled, it will discard these
* pages.
*/
info->oti_fn_index =
(end + 1) >> PAGE_SHIFT;
if (end == OBD_OBJECT_EOF)
info->oti_fn_index =
CL_PAGE_EOF;
}
ldlm_lock_put(tmp);
} else {
info->oti_ng_index = CL_PAGE_EOF;
discard = true;
}
}
if (discard) {
if (cl_page_own(env, io, page) == 0) {
cl_page_discard(env, io, page);
cl_page_disown(env, io, page);
} else {
LASSERT(page->cp_state == CPS_FREEING);
}
}
info->oti_next_index = index + 1;
}
return true;
}
bool osc_discard_cb(const struct lu_env *env, struct cl_io *io,
void **pvec, int count, void *cbdata)
{
struct osc_thread_info *info = osc_env_info(env);
int i;
for (i = 0; i < count; i++) {
struct osc_page *ops = pvec[i];
struct cl_page *page = ops->ops_cl.cpl_page;
/* page is top page. */
info->oti_next_index = osc_index(ops) + 1;
if (cl_page_own(env, io, page) == 0) {
if (!ergo(page->cp_type == CPT_CACHEABLE,
!PageDirty(cl_page_vmpage(page))))
CL_PAGE_DEBUG(D_ERROR, env, page,
"discard dirty page?\n");
/* discard the page */
cl_page_discard(env, io, page);
cl_page_disown(env, io, page);
} else {
LASSERT(page->cp_state == CPS_FREEING);
}
}
return true;
}
EXPORT_SYMBOL(osc_discard_cb);
/**
* osc_lock_discard_pages() - Handle OSC discard/check for lock of pages
* @env: Lustre environment
* @osc: pointer to the Lustre client object
* @start: Start index
* @end: End index
* @discard: If %true discard page. Else check for lock
*
* Discard pages protected by the given lock. This function traverses radix
* tree to find all covering pages and discard them. If a page is being covered
* by other locks, it should remain in cache.
*
* If error happens on any step, the process continues anyway (the reasoning
* behind this being that lock cancellation cannot be delayed indefinitely).
*
* Return:
* * %0: on Success
* * %-ERRNO: on Failure
*/
int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
pgoff_t start, pgoff_t end, bool discard)
{
struct osc_thread_info *info = osc_env_info(env);
struct cl_io *io = osc_env_new_io(env);
osc_page_gang_cbt cb;
int result;
ENTRY;
io->ci_obj = cl_object_top(osc2cl(osc));
io->ci_ignore_layout = 1;
io->ci_invalidate_page_cache = 1;
io->u.ci_misc.lm_next_rpc_time = ktime_get_seconds() +
5 * obd_timeout / 16;
result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
if (result != 0)
GOTO(out, result);
cb = discard ? osc_discard_cb : check_and_discard_cb;
info->oti_fn_index = info->oti_next_index = start;
info->oti_ng_index = 0;
osc_page_gang_lookup(env, io, osc,
info->oti_next_index, end, cb, osc);
out:
cl_io_fini(env, io);
RETURN(result);
}
int osc_ldlm_hp_handle(const struct lu_env *env, struct osc_object *obj,
pgoff_t start, pgoff_t end, bool read_check_only)
{
struct client_obd *cli = osc_cli(obj);
struct osc_extent *ext;
struct osc_extent *next;
bool no_rpc_slots = false;
bool unplug = false;
ENTRY;
spin_lock(&cli->cl_loi_list_lock);
no_rpc_slots = osc_full_dio_in_flight(cli);
spin_unlock(&cli->cl_loi_list_lock);
/*
* Current we only handle with high priority for the case that
* all I/O RPC slots are used out by parallel DIO and there are
* conflict I/O extents in lock blocking AST.
* TODO: Send all I/Os to OSTs on the object corresponding to
* the lock in blocking AST. With higher priority, it does not
* need to iterate over all OSC objects one by one, the conflict
* I/O can be handled more quickly. Thus the lock taken by this
* I/O can be release quickly.
*/
CDEBUG(D_CACHE,
"High prio I/O check: start %lu end %lu RPC(%d):r%u/w%u/d%u\n",
start, end, no_rpc_slots, cli->cl_r_in_flight,
cli->cl_w_in_flight, cli->cl_d_in_flight);
osc_object_lock(obj);
/* Check buffered read extents. */
list_for_each_entry_safe(ext, next, &obj->oo_reading_exts, oe_link) {
EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
if (ext->oe_end < start || ext->oe_start > end)
continue;
if (ext->oe_dio || ext->oe_srvlock)
continue;
list_move_tail(&ext->oe_link, &obj->oo_hp_read_exts);
OSC_EXTENT_DUMP(D_CACHE, ext, "HP read this extent\n");
unplug = true;
}
if (read_check_only)
GOTO(out_unlock, unplug);
/* Check buffered write extents. */
ext = osc_extent_search(obj, start);
if (ext == NULL)
ext = first_extent(obj);
else if (ext->oe_end < start)
ext = next_extent(ext);
while (ext != NULL) {
if (ext->oe_start > end)
break;
ext->oe_fsync_wait = 1;
switch (ext->oe_state) {
case OES_CACHE:
/*
* The extent in HP (oe_hp) is being written back by
* another thread.
*/
if (ext->oe_hp || ext->oe_dio || ext->oe_srvlock)
break;
ext->oe_hp = 1;
list_move_tail(&ext->oe_link, &obj->oo_hp_exts);
OSC_EXTENT_DUMP(D_CACHE, ext, "HP write this extent\n");
unplug = true;
break;
case OES_ACTIVE:
/*
* It is pretty bad to wait for ACTIVE extents, because
* we do not 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.
*/
ext->oe_urgent = 1;
break;
default:
break;
}
ext = next_extent(ext);
}
out_unlock:
osc_object_unlock(obj);
if (unplug)
osc_io_unplug(env, cli, obj);
RETURN(0);
}
