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* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* Implementation of cl_object for LOV layer.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
* Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
*/
#define DEBUG_SUBSYSTEM S_LOV
#include "lov_cl_internal.h"
/** \addtogroup lov
* @{
*/
/*****************************************************************************
*
* Layout operations.
*
*/
struct lov_layout_operations {
int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
struct lov_object *lov,
const struct cl_object_conf *conf,
union lov_layout_state *state);
int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state);
void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state);
void (*llo_install)(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state);
int (*llo_print)(const struct lu_env *env, void *cookie,
lu_printer_t p, const struct lu_object *o);
int (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
struct cl_page *page, struct page *vmpage);
int (*llo_lock_init)(const struct lu_env *env,
struct cl_object *obj, struct cl_lock *lock,
const struct cl_io *io);
int (*llo_io_init)(const struct lu_env *env,
struct cl_object *obj, struct cl_io *io);
int (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
struct cl_attr *attr);
};
static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
/*****************************************************************************
*
* Lov object layout operations.
*
*/
static void lov_install_empty(const struct lu_env *env,
struct lov_object *lov,
union lov_layout_state *state)
{
/*
* File without objects.
*/
}
static int lov_init_empty(const struct lu_env *env,
struct lov_device *dev, struct lov_object *lov,
const struct cl_object_conf *conf,
union lov_layout_state *state)
{
return 0;
}
static void lov_install_raid0(const struct lu_env *env,
struct lov_object *lov,
union lov_layout_state *state)
{
}
static struct cl_object *lov_sub_find(const struct lu_env *env,
struct cl_device *dev,
const struct lu_fid *fid,
const struct cl_object_conf *conf)
{
struct lu_object *o;
o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
return lu2cl(o);
}
static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
struct cl_object *stripe, struct lov_layout_raid0 *r0,
int idx)
{
struct cl_object_header *hdr;
struct cl_object_header *subhdr;
struct cl_object_header *parent;
struct lov_oinfo *oinfo;
int result;
if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
/* For sanity:test_206.
* Do not leave the object in cache to avoid accessing
* freed memory. This is because osc_object is referring to
* lov_oinfo of lsm_stripe_data which will be freed due to
* this failure. */
cl_object_kill(env, stripe);
cl_object_put(env, stripe);
return -EIO;
}
hdr = cl_object_header(lov2cl(lov));
subhdr = cl_object_header(stripe);
oinfo = lov->lo_lsm->lsm_oinfo[idx];
CDEBUG(D_INODE, DFID"@%p[%d] -> "DFID"@%p: ostid: "DOSTID
" idx: %d gen: %d\n",
PFID(&subhdr->coh_lu.loh_fid), subhdr, idx,
PFID(&hdr->coh_lu.loh_fid), hdr, POSTID(&oinfo->loi_oi),
oinfo->loi_ost_idx, oinfo->loi_ost_gen);
/* reuse ->coh_attr_guard to protect coh_parent change */
spin_lock(&subhdr->coh_attr_guard);
parent = subhdr->coh_parent;
if (parent == NULL) {
subhdr->coh_parent = hdr;
spin_unlock(&subhdr->coh_attr_guard);
subhdr->coh_nesting = hdr->coh_nesting + 1;
lu_object_ref_add(&stripe->co_lu, "lov-parent", lov);
r0->lo_sub[idx] = cl2lovsub(stripe);
r0->lo_sub[idx]->lso_super = lov;
r0->lo_sub[idx]->lso_index = idx;
result = 0;
} else {
struct lu_object *old_obj;
struct lov_object *old_lov;
unsigned int mask = D_INODE;
spin_unlock(&subhdr->coh_attr_guard);
old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
LASSERT(old_obj != NULL);
old_lov = cl2lov(lu2cl(old_obj));
if (old_lov->lo_layout_invalid) {
/* the object's layout has already changed but isn't
* refreshed */
lu_object_unhash(env, &stripe->co_lu);
result = -EAGAIN;
} else {
mask = D_ERROR;
result = -EIO;
}
LU_OBJECT_DEBUG(mask, env, &stripe->co_lu,
"stripe %d is already owned.\n", idx);
LU_OBJECT_DEBUG(mask, env, old_obj, "owned.\n");
LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
cl_object_put(env, stripe);
}
return result;
}
static int lov_init_raid0(const struct lu_env *env,
struct lov_device *dev, struct lov_object *lov,
const struct cl_object_conf *conf,
union lov_layout_state *state)
{
int result;
int i;
struct cl_object *stripe;
struct lov_thread_info *lti = lov_env_info(env);
struct cl_object_conf *subconf = <i->lti_stripe_conf;
struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
struct lu_fid *ofid = <i->lti_fid;
struct lov_layout_raid0 *r0 = &state->raid0;
if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) {
dump_lsm(D_ERROR, lsm);
LASSERTF(0, "magic mismatch, expected %d/%d, actual %d.\n",
LOV_MAGIC_V1, LOV_MAGIC_V3, lsm->lsm_magic);
}
LASSERT(lov->lo_lsm == NULL);
lov->lo_lsm = lsm_addref(lsm);
r0->lo_nr = lsm->lsm_stripe_count;
LASSERT(r0->lo_nr <= lov_targets_nr(dev));
OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof(r0->lo_sub[0]));
if (r0->lo_sub != NULL) {
result = 0;
subconf->coc_inode = conf->coc_inode;
spin_lock_init(&r0->lo_sub_lock);
/*
* Create stripe cl_objects.
*/
for (i = 0; i < r0->lo_nr && result == 0; ++i) {
struct cl_device *subdev;
struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
int ost_idx = oinfo->loi_ost_idx;
result = ostid_to_fid(ofid, &oinfo->loi_oi,
oinfo->loi_ost_idx);
if (result != 0)
goto out;
subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
subconf->u.coc_oinfo = oinfo;
LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
/* In the function below, .hs_keycmp resolves to
* lu_obj_hop_keycmp() */
/* coverity[overrun-buffer-val] */
stripe = lov_sub_find(env, subdev, ofid, subconf);
if (!IS_ERR(stripe)) {
result = lov_init_sub(env, lov, stripe, r0, i);
if (result == -EAGAIN) { /* try again */
--i;
result = 0;
}
} else {
result = PTR_ERR(stripe);
}
}
} else
result = -ENOMEM;
out:
return result;
}
static int lov_init_released(const struct lu_env *env,
struct lov_device *dev, struct lov_object *lov,
const struct cl_object_conf *conf,
union lov_layout_state *state)
{
struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
LASSERT(lsm != NULL);
LASSERT(lsm_is_released(lsm));
LASSERT(lov->lo_lsm == NULL);
lov->lo_lsm = lsm_addref(lsm);
return 0;
}
static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state)
{
LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
lov_layout_wait(env, lov);
cl_object_prune(env, &lov->lo_cl);
return 0;
}
static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
struct lovsub_object *los, int idx)
{
struct cl_object *sub;
struct lov_layout_raid0 *r0;
struct lu_site *site;
struct lu_site_bkt_data *bkt;
wait_queue_t *waiter;
r0 = &lov->u.raid0;
LASSERT(r0->lo_sub[idx] == los);
sub = lovsub2cl(los);
site = sub->co_lu.lo_dev->ld_site;
bkt = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
cl_object_kill(env, sub);
/* release a reference to the sub-object and ... */
lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
cl_object_put(env, sub);
/* ... wait until it is actually destroyed---sub-object clears its
* ->lo_sub[] slot in lovsub_object_fini() */
if (r0->lo_sub[idx] == los) {
waiter = &lov_env_info(env)->lti_waiter;
init_waitqueue_entry(waiter, current);
add_wait_queue(&bkt->lsb_marche_funebre, waiter);
set_current_state(TASK_UNINTERRUPTIBLE);
while (1) {
/* this wait-queue is signaled at the end of
* lu_object_free(). */
set_current_state(TASK_UNINTERRUPTIBLE);
spin_lock(&r0->lo_sub_lock);
if (r0->lo_sub[idx] == los) {
spin_unlock(&r0->lo_sub_lock);
schedule();
} else {
spin_unlock(&r0->lo_sub_lock);
set_current_state(TASK_RUNNING);
break;
}
}
remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
}
LASSERT(r0->lo_sub[idx] == NULL);
}
static int lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state)
{
struct lov_layout_raid0 *r0 = &state->raid0;
struct lov_stripe_md *lsm = lov->lo_lsm;
int i;
dump_lsm(D_INODE, lsm);
lov_layout_wait(env, lov);
if (r0->lo_sub != NULL) {
for (i = 0; i < r0->lo_nr; ++i) {
struct lovsub_object *los = r0->lo_sub[i];
if (los != NULL) {
cl_locks_prune(env, &los->lso_cl, 1);
/*
* If top-level object is to be evicted from
* the cache, so are its sub-objects.
*/
lov_subobject_kill(env, lov, los, i);
}
}
}
cl_object_prune(env, &lov->lo_cl);
return 0;
}
static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state)
{
LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
}
static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state)
{
struct lov_layout_raid0 *r0 = &state->raid0;
if (r0->lo_sub != NULL) {
OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof(r0->lo_sub[0]));
r0->lo_sub = NULL;
}
dump_lsm(D_INODE, lov->lo_lsm);
lov_free_memmd(&lov->lo_lsm);
}
static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
union lov_layout_state *state)
{
dump_lsm(D_INODE, lov->lo_lsm);
lov_free_memmd(&lov->lo_lsm);
}
static int lov_print_empty(const struct lu_env *env, void *cookie,
lu_printer_t p, const struct lu_object *o)
{
(*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
return 0;
}
static int lov_print_raid0(const struct lu_env *env, void *cookie,
lu_printer_t p, const struct lu_object *o)
{
struct lov_object *lov = lu2lov(o);
struct lov_layout_raid0 *r0 = lov_r0(lov);
struct lov_stripe_md *lsm = lov->lo_lsm;
int i;
(*p)(env, cookie, "stripes: %d, %s, lsm{%p 0x%08X %d %u %u}:\n",
r0->lo_nr, lov->lo_layout_invalid ? "invalid" : "valid", lsm,
lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
lsm->lsm_stripe_count, lsm->lsm_layout_gen);
for (i = 0; i < r0->lo_nr; ++i) {
struct lu_object *sub;
if (r0->lo_sub[i] != NULL) {
sub = lovsub2lu(r0->lo_sub[i]);
lu_object_print(env, cookie, p, sub);
} else {
(*p)(env, cookie, "sub %d absent\n", i);
}
}
return 0;
}
static int lov_print_released(const struct lu_env *env, void *cookie,
lu_printer_t p, const struct lu_object *o)
{
struct lov_object *lov = lu2lov(o);
struct lov_stripe_md *lsm = lov->lo_lsm;
(*p)(env, cookie,
"released: %s, lsm{%p 0x%08X %d %u %u}:\n",
lov->lo_layout_invalid ? "invalid" : "valid", lsm,
lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
lsm->lsm_stripe_count, lsm->lsm_layout_gen);
return 0;
}
/**
* Implements cl_object_operations::coo_attr_get() method for an object
* without stripes (LLT_EMPTY layout type).
*
* The only attributes this layer is authoritative in this case is
* cl_attr::cat_blocks---it's 0.
*/
static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
struct cl_attr *attr)
{
attr->cat_blocks = 0;
return 0;
}
static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj,
struct cl_attr *attr)
{
struct lov_object *lov = cl2lov(obj);
struct lov_layout_raid0 *r0 = lov_r0(lov);
struct cl_attr *lov_attr = &r0->lo_attr;
int result = 0;
/* this is called w/o holding type guard mutex, so it must be inside
* an on going IO otherwise lsm may be replaced.
* LU-2117: it turns out there exists one exception. For mmaped files,
* the lock of those files may be requested in the other file's IO
* context, and this function is called in ccc_lock_state(), it will
* hit this assertion.
* Anyway, it's still okay to call attr_get w/o type guard as layout
* can't go if locks exist. */
/* LASSERT(atomic_read(&lsm->lsm_refc) > 1); */
if (!r0->lo_attr_valid) {
struct lov_stripe_md *lsm = lov->lo_lsm;
struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
__u64 kms = 0;
memset(lvb, 0, sizeof(*lvb));
/* XXX: timestamps can be negative by sanity:test_39m,
* how can it be? */
lvb->lvb_atime = LLONG_MIN;
lvb->lvb_ctime = LLONG_MIN;
lvb->lvb_mtime = LLONG_MIN;
/*
* XXX that should be replaced with a loop over sub-objects,
* doing cl_object_attr_get() on them. But for now, let's
* reuse old lov code.
*/
/*
* XXX take lsm spin-lock to keep lov_merge_lvb_kms()
* happy. It's not needed, because new code uses
* ->coh_attr_guard spin-lock to protect consistency of
* sub-object attributes.
*/
lov_stripe_lock(lsm);
result = lov_merge_lvb_kms(lsm, lvb, &kms);
lov_stripe_unlock(lsm);
if (result == 0) {
cl_lvb2attr(lov_attr, lvb);
lov_attr->cat_kms = kms;
r0->lo_attr_valid = 1;
}
}
if (result == 0) { /* merge results */
attr->cat_blocks = lov_attr->cat_blocks;
attr->cat_size = lov_attr->cat_size;
attr->cat_kms = lov_attr->cat_kms;
if (attr->cat_atime < lov_attr->cat_atime)
attr->cat_atime = lov_attr->cat_atime;
if (attr->cat_ctime < lov_attr->cat_ctime)
attr->cat_ctime = lov_attr->cat_ctime;
if (attr->cat_mtime < lov_attr->cat_mtime)
attr->cat_mtime = lov_attr->cat_mtime;
}
return result;
}
static const struct lov_layout_operations lov_dispatch[] = {
[LLT_EMPTY] = {
.llo_init = lov_init_empty,
.llo_delete = lov_delete_empty,
.llo_fini = lov_fini_empty,
.llo_install = lov_install_empty,
.llo_print = lov_print_empty,
.llo_page_init = lov_page_init_empty,
.llo_lock_init = lov_lock_init_empty,
.llo_io_init = lov_io_init_empty,
.llo_getattr = lov_attr_get_empty
},
[LLT_RAID0] = {
.llo_init = lov_init_raid0,
.llo_delete = lov_delete_raid0,
.llo_fini = lov_fini_raid0,
.llo_install = lov_install_raid0,
.llo_print = lov_print_raid0,
.llo_page_init = lov_page_init_raid0,
.llo_lock_init = lov_lock_init_raid0,
.llo_io_init = lov_io_init_raid0,
.llo_getattr = lov_attr_get_raid0
},
[LLT_RELEASED] = {
.llo_init = lov_init_released,
.llo_delete = lov_delete_empty,
.llo_fini = lov_fini_released,
.llo_install = lov_install_empty,
.llo_print = lov_print_released,
.llo_page_init = lov_page_init_empty,
.llo_lock_init = lov_lock_init_empty,
.llo_io_init = lov_io_init_released,
.llo_getattr = lov_attr_get_empty
}
};
/**
* Performs a double-dispatch based on the layout type of an object.
*/
#define LOV_2DISPATCH_NOLOCK(obj, op, ...) \
({ \
struct lov_object *__obj = (obj); \
enum lov_layout_type __llt; \
\
__llt = __obj->lo_type; \
LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
lov_dispatch[__llt].op(__VA_ARGS__); \
})
/**
* Return lov_layout_type associated with a given lsm
*/
enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
{
if (lsm == NULL)
return LLT_EMPTY;
if (lsm_is_released(lsm))
return LLT_RELEASED;
return LLT_RAID0;
}
static inline void lov_conf_freeze(struct lov_object *lov)
{
if (lov->lo_owner != current)
down_read(&lov->lo_type_guard);
}
static inline void lov_conf_thaw(struct lov_object *lov)
{
if (lov->lo_owner != current)
up_read(&lov->lo_type_guard);
}
#define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...) \
({ \
struct lov_object *__obj = (obj); \
int __lock = !!(lock); \
typeof(lov_dispatch[0].op(__VA_ARGS__)) __result; \
\
if (__lock) \
lov_conf_freeze(__obj); \
__result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__); \
if (__lock) \
lov_conf_thaw(__obj); \
__result; \
})
/**
* Performs a locked double-dispatch based on the layout type of an object.
*/
#define LOV_2DISPATCH(obj, op, ...) \
LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
#define LOV_2DISPATCH_VOID(obj, op, ...) \
do { \
struct lov_object *__obj = (obj); \
enum lov_layout_type __llt; \
\
lov_conf_freeze(__obj); \
__llt = __obj->lo_type; \
LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
lov_dispatch[__llt].op(__VA_ARGS__); \
lov_conf_thaw(__obj); \
} while (0)
static void lov_conf_lock(struct lov_object *lov)
{
LASSERT(lov->lo_owner != current);
down_write(&lov->lo_type_guard);
LASSERT(lov->lo_owner == NULL);
lov->lo_owner = current;
}
static void lov_conf_unlock(struct lov_object *lov)
{
lov->lo_owner = NULL;
up_write(&lov->lo_type_guard);
}
static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
{
struct l_wait_info lwi = { 0 };
while (atomic_read(&lov->lo_active_ios) > 0) {
CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
PFID(lu_object_fid(lov2lu(lov))),
atomic_read(&lov->lo_active_ios));
l_wait_event(lov->lo_waitq,
atomic_read(&lov->lo_active_ios) == 0, &lwi);
}
return 0;
}
static int lov_layout_change(const struct lu_env *unused,
struct lov_object *lov,
const struct cl_object_conf *conf)
{
int result;
enum lov_layout_type llt = LLT_EMPTY;
union lov_layout_state *state = &lov->u;
const struct lov_layout_operations *old_ops;
const struct lov_layout_operations *new_ops;
struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
void *cookie;
struct lu_env *env;
int refcheck;
LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
if (conf->u.coc_md != NULL)
llt = lov_type(conf->u.coc_md->lsm);
LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
cookie = cl_env_reenter();
env = cl_env_get(&refcheck);
if (IS_ERR(env)) {
cl_env_reexit(cookie);
return PTR_ERR(env);
}
CDEBUG(D_INODE, DFID" from %s to %s\n",
PFID(lu_object_fid(lov2lu(lov))),
llt2str(lov->lo_type), llt2str(llt));
old_ops = &lov_dispatch[lov->lo_type];
new_ops = &lov_dispatch[llt];
result = old_ops->llo_delete(env, lov, &lov->u);
if (result == 0) {
old_ops->llo_fini(env, lov, &lov->u);
LASSERT(atomic_read(&lov->lo_active_ios) == 0);
LASSERT(hdr->coh_tree.rnode == NULL);
LASSERT(hdr->coh_pages == 0);
lov->lo_type = LLT_EMPTY;
result = new_ops->llo_init(env,
lu2lov_dev(lov->lo_cl.co_lu.lo_dev),
lov, conf, state);
if (result == 0) {
new_ops->llo_install(env, lov, state);
lov->lo_type = llt;
} else {
new_ops->llo_delete(env, lov, state);
new_ops->llo_fini(env, lov, state);
/* this file becomes an EMPTY file. */
}
}
cl_env_put(env, &refcheck);
cl_env_reexit(cookie);
return result;
}
/*****************************************************************************
*
* Lov object operations.
*
*/
int lov_object_init(const struct lu_env *env, struct lu_object *obj,
const struct lu_object_conf *conf)
{
struct lov_device *dev = lu2lov_dev(obj->lo_dev);
struct lov_object *lov = lu2lov(obj);
const struct cl_object_conf *cconf = lu2cl_conf(conf);
union lov_layout_state *set = &lov->u;
const struct lov_layout_operations *ops;
int result;
init_rwsem(&lov->lo_type_guard);
atomic_set(&lov->lo_active_ios, 0);
init_waitqueue_head(&lov->lo_waitq);
cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
/* no locking is necessary, as object is being created */
lov->lo_type = lov_type(cconf->u.coc_md->lsm);
ops = &lov_dispatch[lov->lo_type];
result = ops->llo_init(env, dev, lov, cconf, set);
if (result == 0)
ops->llo_install(env, lov, set);
return result;
}
static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
const struct cl_object_conf *conf)
{
struct lov_stripe_md *lsm = NULL;
struct lov_object *lov = cl2lov(obj);
int result = 0;
lov_conf_lock(lov);
if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
lov->lo_layout_invalid = true;
result = 0;
goto out;
}
if (conf->coc_opc == OBJECT_CONF_WAIT) {
if (lov->lo_layout_invalid &&
atomic_read(&lov->lo_active_ios) > 0) {
lov_conf_unlock(lov);
result = lov_layout_wait(env, lov);
lov_conf_lock(lov);
}
goto out;
}
LASSERT(conf->coc_opc == OBJECT_CONF_SET);
if (conf->u.coc_md != NULL)
lsm = conf->u.coc_md->lsm;
if ((lsm == NULL && lov->lo_lsm == NULL) ||
((lsm != NULL && lov->lo_lsm != NULL) &&
(lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
(lov->lo_lsm->lsm_pattern == lsm->lsm_pattern))) {
/* same version of layout */
lov->lo_layout_invalid = false;
result = 0;
goto out;
}
/* will change layout - check if there still exists active IO. */
if (atomic_read(&lov->lo_active_ios) > 0) {
lov->lo_layout_invalid = true;
result = -EBUSY;
goto out;
}
lov->lo_layout_invalid = lov_layout_change(env, lov, conf);
out:
lov_conf_unlock(lov);
CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
return result;
}
static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
{
struct lov_object *lov = lu2lov(obj);
LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
}
static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
{
struct lov_object *lov = lu2lov(obj);
LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
lu_object_fini(obj);
OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
}
static int lov_object_print(const struct lu_env *env, void *cookie,
lu_printer_t p, const struct lu_object *o)
{
return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
}
int lov_page_init(const struct lu_env *env, struct cl_object *obj,
struct cl_page *page, struct page *vmpage)
{
return LOV_2DISPATCH_NOLOCK(cl2lov(obj),
llo_page_init, env, obj, page, vmpage);
}
/**
* Implements cl_object_operations::clo_io_init() method for lov
* layer. Dispatches to the appropriate layout io initialization method.
*/
int lov_io_init(const struct lu_env *env, struct cl_object *obj,
struct cl_io *io)
{
CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
!io->ci_ignore_layout, env, obj, io);
}
/**
* An implementation of cl_object_operations::clo_attr_get() method for lov
* layer. For raid0 layout this collects and merges attributes of all
* sub-objects.
*/
static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
struct cl_attr *attr)
{
/* do not take lock, as this function is called under a
* spin-lock. Layout is protected from changing by ongoing IO. */
return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
}
static int lov_attr_set(const struct lu_env *env, struct cl_object *obj,
const struct cl_attr *attr, unsigned valid)
{
/*
* No dispatch is required here, as no layout implements this.
*/
return 0;
}
int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
struct cl_lock *lock, const struct cl_io *io)
{
/* No need to lock because we've taken one refcount of layout. */
return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
io);
}
static const struct cl_object_operations lov_ops = {
.coo_page_init = lov_page_init,
.coo_lock_init = lov_lock_init,
.coo_io_init = lov_io_init,
.coo_attr_get = lov_attr_get,
.coo_attr_set = lov_attr_set,
.coo_conf_set = lov_conf_set
};
static const struct lu_object_operations lov_lu_obj_ops = {
.loo_object_init = lov_object_init,
.loo_object_delete = lov_object_delete,
.loo_object_release = NULL,
.loo_object_free = lov_object_free,
.loo_object_print = lov_object_print,
.loo_object_invariant = NULL
};
struct lu_object *lov_object_alloc(const struct lu_env *env,
const struct lu_object_header *unused,
struct lu_device *dev)
{
struct lov_object *lov;
struct lu_object *obj;
OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
if (lov != NULL) {
obj = lov2lu(lov);
lu_object_init(obj, NULL, dev);
lov->lo_cl.co_ops = &lov_ops;
lov->lo_type = -1; /* invalid, to catch uninitialized type */
/*
* object io operation vector (cl_object::co_iop) is installed
* later in lov_object_init(), as different vectors are used
* for object with different layouts.
*/
obj->lo_ops = &lov_lu_obj_ops;
} else
obj = NULL;
return obj;
}
struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
{
struct lov_stripe_md *lsm = NULL;
lov_conf_freeze(lov);
if (lov->lo_lsm != NULL) {
lsm = lsm_addref(lov->lo_lsm);
CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
lsm, atomic_read(&lsm->lsm_refc),
lov->lo_layout_invalid, current);
}
lov_conf_thaw(lov);
return lsm;
}
void lov_lsm_decref(struct lov_object *lov, struct lov_stripe_md *lsm)
{
if (lsm == NULL)
return;
CDEBUG(D_INODE, "lsm %p decref %d by %p.\n",
lsm, atomic_read(&lsm->lsm_refc), current);
lov_free_memmd(&lsm);
}
struct lov_stripe_md *lov_lsm_get(struct cl_object *clobj)
{
struct lu_object *luobj;
struct lov_stripe_md *lsm = NULL;
if (clobj == NULL)
return NULL;
luobj = lu_object_locate(&cl_object_header(clobj)->coh_lu,
&lov_device_type);
if (luobj != NULL)
lsm = lov_lsm_addref(lu2lov(luobj));
return lsm;
}
EXPORT_SYMBOL(lov_lsm_get);
void lov_lsm_put(struct cl_object *unused, struct lov_stripe_md *lsm)
{
if (lsm != NULL)
lov_free_memmd(&lsm);
}
EXPORT_SYMBOL(lov_lsm_put);
int lov_read_and_clear_async_rc(struct cl_object *clob)
{
struct lu_object *luobj;
int rc = 0;
luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
&lov_device_type);
if (luobj != NULL) {
struct lov_object *lov = lu2lov(luobj);
lov_conf_freeze(lov);
switch (lov->lo_type) {
case LLT_RAID0: {
struct lov_stripe_md *lsm;
int i;
lsm = lov->lo_lsm;
LASSERT(lsm != NULL);
for (i = 0; i < lsm->lsm_stripe_count; i++) {
struct lov_oinfo *loi = lsm->lsm_oinfo[i];
if (loi->loi_ar.ar_rc && !rc)
rc = loi->loi_ar.ar_rc;
loi->loi_ar.ar_rc = 0;
}
}
case LLT_RELEASED:
case LLT_EMPTY:
break;
default:
LBUG();
}
lov_conf_thaw(lov);
}
return rc;
}
EXPORT_SYMBOL(lov_read_and_clear_async_rc);
/** @} lov */
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