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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_io 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
* @{
*/
static inline void lov_sub_enter(struct lov_io_sub *sub)
{
sub->sub_reenter++;
}
static inline void lov_sub_exit(struct lov_io_sub *sub)
{
sub->sub_reenter--;
}
static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
struct lov_io_sub *sub)
{
if (sub->sub_io != NULL) {
if (sub->sub_io_initialized) {
lov_sub_enter(sub);
cl_io_fini(sub->sub_env, sub->sub_io);
lov_sub_exit(sub);
sub->sub_io_initialized = 0;
lio->lis_active_subios--;
}
if (sub->sub_stripe == lio->lis_single_subio_index)
lio->lis_single_subio_index = -1;
else if (!sub->sub_borrowed)
OBD_FREE_PTR(sub->sub_io);
sub->sub_io = NULL;
}
if (sub->sub_env != NULL && !IS_ERR(sub->sub_env)) {
if (!sub->sub_borrowed)
cl_env_put(sub->sub_env, &sub->sub_refcheck);
sub->sub_env = NULL;
}
}
static void lov_io_sub_inherit(struct cl_io *io, struct lov_io *lio,
int stripe, loff_t start, loff_t end)
{
struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
struct cl_io *parent = lio->lis_cl.cis_io;
switch(io->ci_type) {
case CIT_SETATTR: {
io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
io->u.ci_setattr.sa_capa = parent->u.ci_setattr.sa_capa;
if (cl_io_is_trunc(io)) {
loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
new_size = lov_size_to_stripe(lsm, new_size, stripe);
io->u.ci_setattr.sa_attr.lvb_size = new_size;
}
break;
}
case CIT_FAULT: {
struct cl_object *obj = parent->ci_obj;
loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
io->u.ci_fault = parent->u.ci_fault;
off = lov_size_to_stripe(lsm, off, stripe);
io->u.ci_fault.ft_index = cl_index(obj, off);
break;
}
case CIT_FSYNC: {
io->u.ci_fsync.fi_start = start;
io->u.ci_fsync.fi_end = end;
io->u.ci_fsync.fi_capa = parent->u.ci_fsync.fi_capa;
io->u.ci_fsync.fi_fid = parent->u.ci_fsync.fi_fid;
io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
break;
}
case CIT_READ:
case CIT_WRITE: {
io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
if (cl_io_is_append(parent)) {
io->u.ci_wr.wr_append = 1;
} else {
io->u.ci_rw.crw_pos = start;
io->u.ci_rw.crw_count = end - start;
}
break;
}
default:
break;
}
}
static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
struct lov_io_sub *sub)
{
struct lov_object *lov = lio->lis_object;
struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
struct cl_io *sub_io;
struct cl_object *sub_obj;
struct cl_io *io = lio->lis_cl.cis_io;
int stripe = sub->sub_stripe;
int result;
LASSERT(sub->sub_io == NULL);
LASSERT(sub->sub_env == NULL);
LASSERT(sub->sub_stripe < lio->lis_stripe_count);
result = 0;
sub->sub_io_initialized = 0;
sub->sub_borrowed = 0;
if (lio->lis_mem_frozen) {
LASSERT(mutex_is_locked(&ld->ld_mutex));
sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
sub->sub_borrowed = 1;
} else {
void *cookie;
/* obtain new environment */
cookie = cl_env_reenter();
sub->sub_env = cl_env_get(&sub->sub_refcheck);
cl_env_reexit(cookie);
if (IS_ERR(sub->sub_env))
result = PTR_ERR(sub->sub_env);
if (result == 0) {
/*
* First sub-io. Use ->lis_single_subio to
* avoid dynamic allocation.
*/
if (lio->lis_active_subios == 0) {
sub->sub_io = &lio->lis_single_subio;
lio->lis_single_subio_index = stripe;
} else {
OBD_ALLOC_PTR(sub->sub_io);
if (sub->sub_io == NULL)
result = -ENOMEM;
}
}
}
if (result == 0) {
sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
sub_io = sub->sub_io;
sub_io->ci_obj = sub_obj;
sub_io->ci_result = 0;
sub_io->ci_parent = io;
sub_io->ci_lockreq = io->ci_lockreq;
sub_io->ci_type = io->ci_type;
sub_io->ci_no_srvlock = io->ci_no_srvlock;
lov_sub_enter(sub);
result = cl_io_sub_init(sub->sub_env, sub_io,
io->ci_type, sub_obj);
lov_sub_exit(sub);
if (result >= 0) {
lio->lis_active_subios++;
sub->sub_io_initialized = 1;
result = 0;
}
}
if (result != 0)
lov_io_sub_fini(env, lio, sub);
return result;
}
struct lov_io_sub *lov_sub_get(const struct lu_env *env,
struct lov_io *lio, int stripe)
{
int rc;
struct lov_io_sub *sub = &lio->lis_subs[stripe];
LASSERT(stripe < lio->lis_stripe_count);
if (!sub->sub_io_initialized) {
sub->sub_stripe = stripe;
rc = lov_io_sub_init(env, lio, sub);
} else
rc = 0;
if (rc == 0)
lov_sub_enter(sub);
else
sub = ERR_PTR(rc);
return sub;
}
void lov_sub_put(struct lov_io_sub *sub)
{
lov_sub_exit(sub);
}
/*****************************************************************************
*
* Lov io operations.
*
*/
static int lov_page_stripe(const struct cl_page *page)
{
struct lovsub_object *subobj;
subobj = lu2lovsub(
lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
&lovsub_device_type));
LASSERT(subobj != NULL);
return subobj->lso_index;
}
struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
const struct cl_page_slice *slice)
{
struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
struct cl_page *page = slice->cpl_page;
int stripe;
LASSERT(lio->lis_cl.cis_io != NULL);
LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
LASSERT(lsm != NULL);
LASSERT(lio->lis_nr_subios > 0);
stripe = lov_page_stripe(page);
return lov_sub_get(env, lio, stripe);
}
static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
struct cl_io *io)
{
struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
int result;
LASSERT(lio->lis_object != NULL);
/*
* Need to be optimized, we can't afford to allocate a piece of memory
* when writing a page. -jay
*/
OBD_ALLOC_LARGE(lio->lis_subs,
lsm->lsm_stripe_count * sizeof lio->lis_subs[0]);
if (lio->lis_subs != NULL) {
lio->lis_nr_subios = lio->lis_stripe_count;
lio->lis_single_subio_index = -1;
lio->lis_active_subios = 0;
result = 0;
} else
result = -ENOMEM;
return result;
}
static void lov_io_slice_init(struct lov_io *lio,
struct lov_object *obj, struct cl_io *io)
{
io->ci_result = 0;
lio->lis_object = obj;
LASSERT(obj->lo_lsm != NULL);
lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
switch (io->ci_type) {
case CIT_READ:
case CIT_WRITE:
lio->lis_pos = io->u.ci_rw.crw_pos;
lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
lio->lis_io_endpos = lio->lis_endpos;
if (cl_io_is_append(io)) {
LASSERT(io->ci_type == CIT_WRITE);
lio->lis_pos = 0;
lio->lis_endpos = OBD_OBJECT_EOF;
}
break;
case CIT_SETATTR:
if (cl_io_is_trunc(io))
lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
else
lio->lis_pos = 0;
lio->lis_endpos = OBD_OBJECT_EOF;
break;
case CIT_FAULT: {
pgoff_t index = io->u.ci_fault.ft_index;
lio->lis_pos = cl_offset(io->ci_obj, index);
lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
break;
}
case CIT_FSYNC: {
lio->lis_pos = io->u.ci_fsync.fi_start;
lio->lis_endpos = io->u.ci_fsync.fi_end;
break;
}
case CIT_MISC:
lio->lis_pos = 0;
lio->lis_endpos = OBD_OBJECT_EOF;
break;
default:
LBUG();
}
}
static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
{
struct lov_io *lio = cl2lov_io(env, ios);
struct lov_object *lov = cl2lov(ios->cis_obj);
int i;
if (lio->lis_subs != NULL) {
for (i = 0; i < lio->lis_nr_subios; i++)
lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
OBD_FREE_LARGE(lio->lis_subs,
lio->lis_nr_subios * sizeof lio->lis_subs[0]);
lio->lis_nr_subios = 0;
}
LASSERT(atomic_read(&lov->lo_active_ios) > 0);
if (atomic_dec_and_test(&lov->lo_active_ios))
wake_up_all(&lov->lo_waitq);
}
static obd_off lov_offset_mod(obd_off val, int delta)
{
if (val != OBD_OBJECT_EOF)
val += delta;
return val;
}
static int lov_io_iter_init(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct lov_io *lio = cl2lov_io(env, ios);
struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
struct lov_io_sub *sub;
obd_off endpos;
obd_off start;
obd_off end;
int stripe;
int rc = 0;
endpos = lov_offset_mod(lio->lis_endpos, -1);
for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
endpos, &start, &end))
continue;
end = lov_offset_mod(end, +1);
sub = lov_sub_get(env, lio, stripe);
if (!IS_ERR(sub)) {
lov_io_sub_inherit(sub->sub_io, lio, stripe,
start, end);
rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
lov_sub_put(sub);
CDEBUG(D_VFSTRACE, "shrink: %d ["LPU64", "LPU64")\n",
stripe, start, end);
} else
rc = PTR_ERR(sub);
if (!rc)
list_add_tail(&sub->sub_linkage, &lio->lis_active);
else
break;
}
return rc;
}
static int lov_io_rw_iter_init(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct lov_io *lio = cl2lov_io(env, ios);
struct cl_io *io = ios->cis_io;
struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
__u64 start = io->u.ci_rw.crw_pos;
loff_t next;
unsigned long ssize = lsm->lsm_stripe_size;
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
/* fast path for common case. */
if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
lov_do_div64(start, ssize);
next = (start + 1) * ssize;
if (next <= start * ssize)
next = ~0ull;
io->ci_continue = next < lio->lis_io_endpos;
io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
next) - io->u.ci_rw.crw_pos;
lio->lis_pos = io->u.ci_rw.crw_pos;
lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "
LPU64"\n", (__u64)start, lio->lis_pos, lio->lis_endpos,
(__u64)lio->lis_io_endpos);
}
/*
* XXX The following call should be optimized: we know, that
* [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
*/
return lov_io_iter_init(env, ios);
}
static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
int (*iofunc)(const struct lu_env *, struct cl_io *))
{
struct cl_io *parent = lio->lis_cl.cis_io;
struct lov_io_sub *sub;
int rc = 0;
list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
lov_sub_enter(sub);
rc = iofunc(sub->sub_env, sub->sub_io);
lov_sub_exit(sub);
if (rc)
break;
if (parent->ci_result == 0)
parent->ci_result = sub->sub_io->ci_result;
}
return rc;
}
static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
{
return lov_io_call(env, cl2lov_io(env, ios), cl_io_lock);
}
static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
{
return lov_io_call(env, cl2lov_io(env, ios), cl_io_start);
}
static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
{
/*
* It's possible that lov_io_start() wasn't called against this
* sub-io, either because previous sub-io failed, or upper layer
* completed IO.
*/
if (io->ci_state == CIS_IO_GOING)
cl_io_end(env, io);
else
io->ci_state = CIS_IO_FINISHED;
return 0;
}
static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
{
cl_io_iter_fini(env, io);
return 0;
}
static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
{
cl_io_unlock(env, io);
return 0;
}
static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
{
int rc;
rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
LASSERT(rc == 0);
}
static void lov_io_iter_fini(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct lov_io *lio = cl2lov_io(env, ios);
int rc;
rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
LASSERT(rc == 0);
while (!list_empty(&lio->lis_active))
list_del_init(lio->lis_active.next);
}
static void lov_io_unlock(const struct lu_env *env,
const struct cl_io_slice *ios)
{
int rc;
rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
LASSERT(rc == 0);
}
static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
struct cl_page_list *qin,
int idx, int alloc)
{
return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
}
/**
* lov implementation of cl_operations::cio_submit() method. It takes a list
* of pages in \a queue, splits it into per-stripe sub-lists, invokes
* cl_io_submit() on underlying devices to submit sub-lists, and then splices
* everything back.
*
* Major complication of this function is a need to handle memory cleansing:
* cl_io_submit() is called to write out pages as a part of VM memory
* reclamation, and hence it may not fail due to memory shortages (system
* dead-locks otherwise). To deal with this, some resources (sub-lists,
* sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
* not-memory cleansing context), and in case of memory shortage, these
* pre-allocated resources are used by lov_io_submit() under
* lov_device::ld_mutex mutex.
*/
static int lov_io_submit(const struct lu_env *env,
const struct cl_io_slice *ios,
enum cl_req_type crt, struct cl_2queue *queue)
{
struct lov_io *lio = cl2lov_io(env, ios);
struct lov_object *obj = lio->lis_object;
struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
struct cl_page_list *qin = &queue->c2_qin;
struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
struct cl_page_list *stripes_qin = NULL;
struct cl_page *page;
struct cl_page *tmp;
int stripe;
#define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
int rc = 0;
int alloc =
!(current->flags & PF_MEMALLOC);
if (lio->lis_active_subios == 1) {
int idx = lio->lis_single_subio_index;
struct lov_io_sub *sub;
LASSERT(idx < lio->lis_nr_subios);
sub = lov_sub_get(env, lio, idx);
LASSERT(!IS_ERR(sub));
LASSERT(sub->sub_io == &lio->lis_single_subio);
rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
crt, queue);
lov_sub_put(sub);
return rc;
}
LASSERT(lio->lis_subs != NULL);
if (alloc) {
OBD_ALLOC_LARGE(stripes_qin,
sizeof(*stripes_qin) * lio->lis_nr_subios);
if (stripes_qin == NULL)
return -ENOMEM;
for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
cl_page_list_init(&stripes_qin[stripe]);
} else {
/*
* If we get here, it means pageout & swap doesn't help.
* In order to not make things worse, even don't try to
* allocate the memory with __GFP_NOWARN. -jay
*/
mutex_lock(&ld->ld_mutex);
lio->lis_mem_frozen = 1;
}
cl_2queue_init(cl2q);
cl_page_list_for_each_safe(page, tmp, qin) {
stripe = lov_page_stripe(page);
cl_page_list_move(QIN(stripe), qin, page);
}
for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
struct lov_io_sub *sub;
struct cl_page_list *sub_qin = QIN(stripe);
if (list_empty(&sub_qin->pl_pages))
continue;
cl_page_list_splice(sub_qin, &cl2q->c2_qin);
sub = lov_sub_get(env, lio, stripe);
if (!IS_ERR(sub)) {
rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
crt, cl2q);
lov_sub_put(sub);
} else
rc = PTR_ERR(sub);
cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
if (rc != 0)
break;
}
for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
struct cl_page_list *sub_qin = QIN(stripe);
if (list_empty(&sub_qin->pl_pages))
continue;
cl_page_list_splice(sub_qin, qin);
}
if (alloc) {
OBD_FREE_LARGE(stripes_qin,
sizeof(*stripes_qin) * lio->lis_nr_subios);
} else {
int i;
for (i = 0; i < lio->lis_nr_subios; i++) {
struct cl_io *cio = lio->lis_subs[i].sub_io;
if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
}
lio->lis_mem_frozen = 0;
mutex_unlock(&ld->ld_mutex);
}
return rc;
#undef QIN
}
static int lov_io_prepare_write(const struct lu_env *env,
const struct cl_io_slice *ios,
const struct cl_page_slice *slice,
unsigned from, unsigned to)
{
struct lov_io *lio = cl2lov_io(env, ios);
struct cl_page *sub_page = lov_sub_page(slice);
struct lov_io_sub *sub;
int result;
sub = lov_page_subio(env, lio, slice);
if (!IS_ERR(sub)) {
result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
sub_page, from, to);
lov_sub_put(sub);
} else
result = PTR_ERR(sub);
return result;
}
static int lov_io_commit_write(const struct lu_env *env,
const struct cl_io_slice *ios,
const struct cl_page_slice *slice,
unsigned from, unsigned to)
{
struct lov_io *lio = cl2lov_io(env, ios);
struct cl_page *sub_page = lov_sub_page(slice);
struct lov_io_sub *sub;
int result;
sub = lov_page_subio(env, lio, slice);
if (!IS_ERR(sub)) {
result = cl_io_commit_write(sub->sub_env, sub->sub_io,
sub_page, from, to);
lov_sub_put(sub);
} else
result = PTR_ERR(sub);
return result;
}
static int lov_io_fault_start(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_fault_io *fio;
struct lov_io *lio;
struct lov_io_sub *sub;
fio = &ios->cis_io->u.ci_fault;
lio = cl2lov_io(env, ios);
sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
lov_sub_put(sub);
return lov_io_start(env, ios);
}
static void lov_io_fsync_end(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct lov_io *lio = cl2lov_io(env, ios);
struct lov_io_sub *sub;
unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
*written = 0;
list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
struct cl_io *subio = sub->sub_io;
lov_sub_enter(sub);
lov_io_end_wrapper(sub->sub_env, subio);
lov_sub_exit(sub);
if (subio->ci_result == 0)
*written += subio->u.ci_fsync.fi_nr_written;
}
}
static const struct cl_io_operations lov_io_ops = {
.op = {
[CIT_READ] = {
.cio_fini = lov_io_fini,
.cio_iter_init = lov_io_rw_iter_init,
.cio_iter_fini = lov_io_iter_fini,
.cio_lock = lov_io_lock,
.cio_unlock = lov_io_unlock,
.cio_start = lov_io_start,
.cio_end = lov_io_end
},
[CIT_WRITE] = {
.cio_fini = lov_io_fini,
.cio_iter_init = lov_io_rw_iter_init,
.cio_iter_fini = lov_io_iter_fini,
.cio_lock = lov_io_lock,
.cio_unlock = lov_io_unlock,
.cio_start = lov_io_start,
.cio_end = lov_io_end
},
[CIT_SETATTR] = {
.cio_fini = lov_io_fini,
.cio_iter_init = lov_io_iter_init,
.cio_iter_fini = lov_io_iter_fini,
.cio_lock = lov_io_lock,
.cio_unlock = lov_io_unlock,
.cio_start = lov_io_start,
.cio_end = lov_io_end
},
[CIT_FAULT] = {
.cio_fini = lov_io_fini,
.cio_iter_init = lov_io_iter_init,
.cio_iter_fini = lov_io_iter_fini,
.cio_lock = lov_io_lock,
.cio_unlock = lov_io_unlock,
.cio_start = lov_io_fault_start,
.cio_end = lov_io_end
},
[CIT_FSYNC] = {
.cio_fini = lov_io_fini,
.cio_iter_init = lov_io_iter_init,
.cio_iter_fini = lov_io_iter_fini,
.cio_lock = lov_io_lock,
.cio_unlock = lov_io_unlock,
.cio_start = lov_io_start,
.cio_end = lov_io_fsync_end
},
[CIT_MISC] = {
.cio_fini = lov_io_fini
}
},
.req_op = {
[CRT_READ] = {
.cio_submit = lov_io_submit
},
[CRT_WRITE] = {
.cio_submit = lov_io_submit
}
},
.cio_prepare_write = lov_io_prepare_write,
.cio_commit_write = lov_io_commit_write
};
/*****************************************************************************
*
* Empty lov io operations.
*
*/
static void lov_empty_io_fini(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct lov_object *lov = cl2lov(ios->cis_obj);
if (atomic_dec_and_test(&lov->lo_active_ios))
wake_up_all(&lov->lo_waitq);
}
static void lov_empty_impossible(const struct lu_env *env,
struct cl_io_slice *ios)
{
LBUG();
}
#define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
/**
* An io operation vector for files without stripes.
*/
static const struct cl_io_operations lov_empty_io_ops = {
.op = {
[CIT_READ] = {
.cio_fini = lov_empty_io_fini,
#if 0
.cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
.cio_lock = LOV_EMPTY_IMPOSSIBLE,
.cio_start = LOV_EMPTY_IMPOSSIBLE,
.cio_end = LOV_EMPTY_IMPOSSIBLE
#endif
},
[CIT_WRITE] = {
.cio_fini = lov_empty_io_fini,
.cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
.cio_lock = LOV_EMPTY_IMPOSSIBLE,
.cio_start = LOV_EMPTY_IMPOSSIBLE,
.cio_end = LOV_EMPTY_IMPOSSIBLE
},
[CIT_SETATTR] = {
.cio_fini = lov_empty_io_fini,
.cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
.cio_lock = LOV_EMPTY_IMPOSSIBLE,
.cio_start = LOV_EMPTY_IMPOSSIBLE,
.cio_end = LOV_EMPTY_IMPOSSIBLE
},
[CIT_FAULT] = {
.cio_fini = lov_empty_io_fini,
.cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
.cio_lock = LOV_EMPTY_IMPOSSIBLE,
.cio_start = LOV_EMPTY_IMPOSSIBLE,
.cio_end = LOV_EMPTY_IMPOSSIBLE
},
[CIT_FSYNC] = {
.cio_fini = lov_empty_io_fini
},
[CIT_MISC] = {
.cio_fini = lov_empty_io_fini
}
},
.req_op = {
[CRT_READ] = {
.cio_submit = LOV_EMPTY_IMPOSSIBLE
},
[CRT_WRITE] = {
.cio_submit = LOV_EMPTY_IMPOSSIBLE
}
},
.cio_commit_write = LOV_EMPTY_IMPOSSIBLE
};
int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
struct cl_io *io)
{
struct lov_io *lio = lov_env_io(env);
struct lov_object *lov = cl2lov(obj);
INIT_LIST_HEAD(&lio->lis_active);
lov_io_slice_init(lio, lov, io);
if (io->ci_result == 0) {
io->ci_result = lov_io_subio_init(env, lio, io);
if (io->ci_result == 0) {
cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
atomic_inc(&lov->lo_active_ios);
}
}
return io->ci_result;
}
int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
struct cl_io *io)
{
struct lov_object *lov = cl2lov(obj);
struct lov_io *lio = lov_env_io(env);
int result;
lio->lis_object = lov;
switch (io->ci_type) {
default:
LBUG();
case CIT_MISC:
case CIT_READ:
result = 0;
break;
case CIT_FSYNC:
case CIT_SETATTR:
result = +1;
break;
case CIT_WRITE:
result = -EBADF;
break;
case CIT_FAULT:
result = -EFAULT;
CERROR("Page fault on a file without stripes: "DFID"\n",
PFID(lu_object_fid(&obj->co_lu)));
break;
}
if (result == 0) {
cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
atomic_inc(&lov->lo_active_ios);
}
io->ci_result = result < 0 ? result : 0;
return result != 0;
}
int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
struct cl_io *io)
{
struct lov_object *lov = cl2lov(obj);
struct lov_io *lio = lov_env_io(env);
int result;
LASSERT(lov->lo_lsm != NULL);
lio->lis_object = lov;
switch (io->ci_type) {
default:
LASSERTF(0, "invalid type %d\n", io->ci_type);
case CIT_MISC:
case CIT_FSYNC:
result = +1;
break;
case CIT_SETATTR:
case CIT_READ:
case CIT_WRITE:
case CIT_FAULT:
/* TODO: need to restore the file. */
result = -EBADF;
break;
}
if (result == 0) {
cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
atomic_inc(&lov->lo_active_ios);
}
io->ci_result = result < 0 ? result : 0;
return result != 0;
}
/** @} lov */
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