diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/lov/lov_io.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/lov/lov_io.c | 1023 |
1 files changed, 0 insertions, 1023 deletions
diff --git a/drivers/staging/lustre/lustre/lov/lov_io.c b/drivers/staging/lustre/lustre/lov/lov_io.c deleted file mode 100644 index b823f8a21856..000000000000 --- a/drivers/staging/lustre/lustre/lov/lov_io.c +++ /dev/null @@ -1,1023 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2011, 2015, 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 void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio, - struct lov_io_sub *sub) -{ - if (sub->sub_io) { - if (sub->sub_io_initialized) { - cl_io_fini(sub->sub_env, sub->sub_io); - 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) - kfree(sub->sub_io); - sub->sub_io = NULL; - } - if (!IS_ERR_OR_NULL(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_attr_flags = - parent->u.ci_setattr.sa_attr_flags; - io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid; - io->u.ci_setattr.sa_stripe_index = stripe; - io->u.ci_setattr.sa_parent_fid = - parent->u.ci_setattr.sa_parent_fid; - 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_DATA_VERSION: { - io->u.ci_data_version.dv_data_version = 0; - io->u.ci_data_version.dv_flags = - parent->u.ci_data_version.dv_flags; - 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_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 cl_io *sub_io; - struct cl_object *sub_obj; - struct cl_io *io = lio->lis_cl.cis_io; - int stripe = sub->sub_stripe; - int rc; - - LASSERT(!sub->sub_io); - LASSERT(!sub->sub_env); - LASSERT(sub->sub_stripe < lio->lis_stripe_count); - - if (unlikely(!lov_r0(lov)->lo_sub[stripe])) - return -EIO; - - sub->sub_io_initialized = 0; - sub->sub_borrowed = 0; - - /* obtain new environment */ - sub->sub_env = cl_env_get(&sub->sub_refcheck); - if (IS_ERR(sub->sub_env)) { - rc = PTR_ERR(sub->sub_env); - goto fini_lov_io; - } - - /* - * 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 { - sub->sub_io = kzalloc(sizeof(*sub->sub_io), - GFP_NOFS); - if (!sub->sub_io) { - rc = -ENOMEM; - goto fini_lov_io; - } - } - - 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; - - rc = cl_io_sub_init(sub->sub_env, sub_io, io->ci_type, sub_obj); - if (rc >= 0) { - lio->lis_active_subios++; - sub->sub_io_initialized = 1; - rc = 0; - } -fini_lov_io: - if (rc) - lov_io_sub_fini(env, lio, sub); - return rc; -} - -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) - sub = ERR_PTR(rc); - - return sub; -} - -/***************************************************************************** - * - * Lov io operations. - * - */ - -int lov_page_stripe(const struct cl_page *page) -{ - const struct cl_page_slice *slice; - - slice = cl_page_at(page, &lov_device_type); - LASSERT(slice->cpl_obj); - - return cl2lov_page(slice)->lps_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; - int result; - - LASSERT(lio->lis_object); - lsm = lio->lis_object->lo_lsm; - - /* - * Need to be optimized, we can't afford to allocate a piece of memory - * when writing a page. -jay - */ - lio->lis_subs = - kvzalloc(lsm->lsm_stripe_count * - sizeof(lio->lis_subs[0]), - GFP_NOFS); - if (lio->lis_subs) { - 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 int lov_io_slice_init(struct lov_io *lio, struct lov_object *obj, - struct cl_io *io) -{ - io->ci_result = 0; - lio->lis_object = obj; - - 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); - - /* - * If there is LOV EA hole, then we may cannot locate - * the current file-tail exactly. - */ - if (unlikely(obj->lo_lsm->lsm_pattern & - LOV_PATTERN_F_HOLE)) - return -EIO; - - 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_DATA_VERSION: - 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(); - } - return 0; -} - -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) { - for (i = 0; i < lio->lis_nr_subios; i++) - lov_io_sub_fini(env, lio, &lio->lis_subs[i]); - kvfree(lio->lis_subs); - 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])) { - 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)) { - rc = PTR_ERR(sub); - break; - } - - lov_io_sub_inherit(sub->sub_io, lio, stripe, start, end); - rc = cl_io_iter_init(sub->sub_env, sub->sub_io); - if (rc) { - cl_io_iter_fini(sub->sub_env, sub->sub_io); - break; - } - CDEBUG(D_VFSTRACE, "shrink: %d [%llu, %llu)\n", - stripe, start, end); - - list_add_tail(&sub->sub_linkage, &lio->lis_active); - } - 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) { - rc = iofunc(sub->sub_env, sub->sub_io); - 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 void -lov_io_data_version_end(const struct lu_env *env, const struct cl_io_slice *ios) -{ - struct lov_io *lio = cl2lov_io(env, ios); - struct cl_io *parent = lio->lis_cl.cis_io; - struct lov_io_sub *sub; - - list_for_each_entry(sub, &lio->lis_active, sub_linkage) { - lov_io_end_wrapper(sub->sub_env, sub->sub_io); - - parent->u.ci_data_version.dv_data_version += - sub->sub_io->u.ci_data_version.dv_data_version; - - if (!parent->ci_result) - parent->ci_result = sub->sub_io->ci_result; - } -} - -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 int lov_io_read_ahead(const struct lu_env *env, - const struct cl_io_slice *ios, - pgoff_t start, struct cl_read_ahead *ra) -{ - struct lov_io *lio = cl2lov_io(env, ios); - struct lov_object *loo = lio->lis_object; - struct cl_object *obj = lov2cl(loo); - struct lov_layout_raid0 *r0 = lov_r0(loo); - unsigned int pps; /* pages per stripe */ - struct lov_io_sub *sub; - pgoff_t ra_end; - loff_t suboff; - int stripe; - int rc; - - stripe = lov_stripe_number(loo->lo_lsm, cl_offset(obj, start)); - if (unlikely(!r0->lo_sub[stripe])) - return -EIO; - - sub = lov_sub_get(env, lio, stripe); - if (IS_ERR(sub)) - return PTR_ERR(sub); - - lov_stripe_offset(loo->lo_lsm, cl_offset(obj, start), stripe, &suboff); - rc = cl_io_read_ahead(sub->sub_env, sub->sub_io, - cl_index(lovsub2cl(r0->lo_sub[stripe]), suboff), - ra); - - CDEBUG(D_READA, DFID " cra_end = %lu, stripes = %d, rc = %d\n", - PFID(lu_object_fid(lov2lu(loo))), ra->cra_end, r0->lo_nr, rc); - if (rc) - return rc; - - /** - * Adjust the stripe index by layout of raid0. ra->cra_end is - * the maximum page index covered by an underlying DLM lock. - * This function converts cra_end from stripe level to file - * level, and make sure it's not beyond stripe boundary. - */ - if (r0->lo_nr == 1) /* single stripe file */ - return 0; - - /* cra_end is stripe level, convert it into file level */ - ra_end = ra->cra_end; - if (ra_end != CL_PAGE_EOF) - ra_end = lov_stripe_pgoff(loo->lo_lsm, ra_end, stripe); - - pps = loo->lo_lsm->lsm_stripe_size >> PAGE_SHIFT; - - CDEBUG(D_READA, DFID " max_index = %lu, pps = %u, stripe_size = %u, stripe no = %u, start index = %lu\n", - PFID(lu_object_fid(lov2lu(loo))), ra_end, pps, - loo->lo_lsm->lsm_stripe_size, stripe, start); - - /* never exceed the end of the stripe */ - ra->cra_end = min_t(pgoff_t, ra_end, start + pps - start % pps - 1); - return 0; -} - -/** - * 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 cl_page_list *qin = &queue->c2_qin; - struct lov_io *lio = cl2lov_io(env, ios); - struct lov_io_sub *sub; - struct cl_page_list *plist = &lov_env_info(env)->lti_plist; - struct cl_page *page; - int stripe; - - int rc = 0; - - if (lio->lis_active_subios == 1) { - int idx = lio->lis_single_subio_index; - - 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); - return rc; - } - - LASSERT(lio->lis_subs); - - cl_page_list_init(plist); - while (qin->pl_nr > 0) { - struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q; - - cl_2queue_init(cl2q); - - page = cl_page_list_first(qin); - cl_page_list_move(&cl2q->c2_qin, qin, page); - - stripe = lov_page_stripe(page); - while (qin->pl_nr > 0) { - page = cl_page_list_first(qin); - if (stripe != lov_page_stripe(page)) - break; - - cl_page_list_move(&cl2q->c2_qin, qin, page); - } - - sub = lov_sub_get(env, lio, stripe); - if (!IS_ERR(sub)) { - rc = cl_io_submit_rw(sub->sub_env, sub->sub_io, - crt, cl2q); - } else { - rc = PTR_ERR(sub); - } - - cl_page_list_splice(&cl2q->c2_qin, plist); - cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout); - cl_2queue_fini(env, cl2q); - - if (rc != 0) - break; - } - - cl_page_list_splice(plist, qin); - cl_page_list_fini(env, plist); - - return rc; -} - -static int lov_io_commit_async(const struct lu_env *env, - const struct cl_io_slice *ios, - struct cl_page_list *queue, int from, int to, - cl_commit_cbt cb) -{ - struct cl_page_list *plist = &lov_env_info(env)->lti_plist; - struct lov_io *lio = cl2lov_io(env, ios); - struct lov_io_sub *sub; - struct cl_page *page; - int rc = 0; - - if (lio->lis_active_subios == 1) { - int idx = lio->lis_single_subio_index; - - 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_commit_async(sub->sub_env, sub->sub_io, queue, - from, to, cb); - return rc; - } - - LASSERT(lio->lis_subs); - - cl_page_list_init(plist); - while (queue->pl_nr > 0) { - int stripe_to = to; - int stripe; - - LASSERT(plist->pl_nr == 0); - page = cl_page_list_first(queue); - cl_page_list_move(plist, queue, page); - - stripe = lov_page_stripe(page); - while (queue->pl_nr > 0) { - page = cl_page_list_first(queue); - if (stripe != lov_page_stripe(page)) - break; - - cl_page_list_move(plist, queue, page); - } - - if (queue->pl_nr > 0) /* still has more pages */ - stripe_to = PAGE_SIZE; - - sub = lov_sub_get(env, lio, stripe); - if (!IS_ERR(sub)) { - rc = cl_io_commit_async(sub->sub_env, sub->sub_io, - plist, from, stripe_to, cb); - } else { - rc = PTR_ERR(sub); - break; - } - - if (plist->pl_nr > 0) /* short write */ - break; - - from = 0; - } - - /* for error case, add the page back into the qin list */ - LASSERT(ergo(rc == 0, plist->pl_nr == 0)); - while (plist->pl_nr > 0) { - /* error occurred, add the uncommitted pages back into queue */ - page = cl_page_list_last(plist); - cl_page_list_move_head(queue, plist, page); - } - - return rc; -} - -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)); - if (IS_ERR(sub)) - return PTR_ERR(sub); - sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob; - 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_io_end_wrapper(sub->sub_env, subio); - - 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_DATA_VERSION] = { - .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_data_version_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 - } - }, - .cio_read_ahead = lov_io_read_ahead, - .cio_submit = lov_io_submit, - .cio_commit_async = lov_io_commit_async, -}; - -/***************************************************************************** - * - * 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 int lov_empty_io_submit(const struct lu_env *env, - const struct cl_io_slice *ios, - enum cl_req_type crt, struct cl_2queue *queue) -{ - return -EBADF; -} - -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, - }, - [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 - } - }, - .cio_submit = lov_empty_io_submit, - .cio_commit_async = 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); - io->ci_result = 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: - case CIT_DATA_VERSION: - 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; -} - -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); - lio->lis_object = lov; - - switch (io->ci_type) { - default: - LASSERTF(0, "invalid type %d\n", io->ci_type); - result = -EOPNOTSUPP; - break; - case CIT_MISC: - case CIT_FSYNC: - case CIT_DATA_VERSION: - 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; - } else { - result = 1; - } - 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; -} - -/** @} lov */ |