--- /dev/null
+/*
+ * 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);
+
+ if (unlikely(lov_r0(lov)->lo_sub[stripe] == NULL))
+ return -EIO;
+
+ 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;
+ sub_io->ci_noatime = io->ci_noatime;
+
+ 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 u64 lov_offset_mod(u64 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;
+ u64 endpos;
+ u64 start;
+ u64 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;
+
+ if (unlikely(lov_r0(lio->lis_object)->lo_sub[stripe] == NULL)) {
+ if (ios->cis_io->ci_type == CIT_READ ||
+ ios->cis_io->ci_type == CIT_WRITE ||
+ ios->cis_io->ci_type == CIT_FAULT)
+ return -EIO;
+
+ 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 [%llu, %llu)\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: %llu chunk: [%llu, %llu) %llu\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:
+ /* the truncate to 0 is managed by MDT:
+ * - in open, for open O_TRUNC
+ * - in setattr, for truncate
+ */
+ /* the truncate is for size > 0 so triggers a restore */
+ if (cl_io_is_trunc(io))
+ io->ci_restore_needed = 1;
+ result = -ENODATA;
+ break;
+ case CIT_READ:
+ case CIT_WRITE:
+ case CIT_FAULT:
+ io->ci_restore_needed = 1;
+ result = -ENODATA;
+ 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 */
Code Review / kvmfornfv.git / blobdiff