398 lines
11 KiB
C
398 lines
11 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2011, 2012, Intel Corporation.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*
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* lustre/llite/llite_close.c
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*
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* Lustre Lite routines to issue a secondary close after writeback
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*/
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#include <linux/module.h>
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#define DEBUG_SUBSYSTEM S_LLITE
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#include "../include/lustre_lite.h"
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#include "llite_internal.h"
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/** records that a write is in flight */
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void vvp_write_pending(struct ccc_object *club, struct ccc_page *page)
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{
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struct ll_inode_info *lli = ll_i2info(club->cob_inode);
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spin_lock(&lli->lli_lock);
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lli->lli_flags |= LLIF_SOM_DIRTY;
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if (page != NULL && list_empty(&page->cpg_pending_linkage))
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list_add(&page->cpg_pending_linkage,
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&club->cob_pending_list);
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spin_unlock(&lli->lli_lock);
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}
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/** records that a write has completed */
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void vvp_write_complete(struct ccc_object *club, struct ccc_page *page)
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{
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struct ll_inode_info *lli = ll_i2info(club->cob_inode);
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int rc = 0;
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spin_lock(&lli->lli_lock);
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if (page != NULL && !list_empty(&page->cpg_pending_linkage)) {
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list_del_init(&page->cpg_pending_linkage);
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rc = 1;
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}
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spin_unlock(&lli->lli_lock);
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if (rc)
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ll_queue_done_writing(club->cob_inode, 0);
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}
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/** Queues DONE_WRITING if
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* - done writing is allowed;
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* - inode has no no dirty pages; */
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void ll_queue_done_writing(struct inode *inode, unsigned long flags)
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{
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struct ll_inode_info *lli = ll_i2info(inode);
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struct ccc_object *club = cl2ccc(ll_i2info(inode)->lli_clob);
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spin_lock(&lli->lli_lock);
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lli->lli_flags |= flags;
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if ((lli->lli_flags & LLIF_DONE_WRITING) &&
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list_empty(&club->cob_pending_list)) {
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struct ll_close_queue *lcq = ll_i2sbi(inode)->ll_lcq;
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if (lli->lli_flags & LLIF_MDS_SIZE_LOCK)
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CWARN("ino %lu/%u(flags %u) som valid it just after "
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"recovery\n",
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inode->i_ino, inode->i_generation,
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lli->lli_flags);
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/* DONE_WRITING is allowed and inode has no dirty page. */
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spin_lock(&lcq->lcq_lock);
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LASSERT(list_empty(&lli->lli_close_list));
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CDEBUG(D_INODE, "adding inode %lu/%u to close list\n",
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inode->i_ino, inode->i_generation);
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list_add_tail(&lli->lli_close_list, &lcq->lcq_head);
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/* Avoid a concurrent insertion into the close thread queue:
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* an inode is already in the close thread, open(), write(),
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* close() happen, epoch is closed as the inode is marked as
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* LLIF_EPOCH_PENDING. When pages are written inode should not
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* be inserted into the queue again, clear this flag to avoid
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* it. */
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lli->lli_flags &= ~LLIF_DONE_WRITING;
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wake_up(&lcq->lcq_waitq);
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spin_unlock(&lcq->lcq_lock);
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}
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spin_unlock(&lli->lli_lock);
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}
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/** Pack SOM attributes info @opdata for CLOSE, DONE_WRITING rpc. */
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void ll_done_writing_attr(struct inode *inode, struct md_op_data *op_data)
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{
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struct ll_inode_info *lli = ll_i2info(inode);
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op_data->op_flags |= MF_SOM_CHANGE;
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/* Check if Size-on-MDS attributes are valid. */
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if (lli->lli_flags & LLIF_MDS_SIZE_LOCK)
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CERROR("ino %lu/%u(flags %u) som valid it just after "
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"recovery\n", inode->i_ino, inode->i_generation,
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lli->lli_flags);
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if (!cl_local_size(inode)) {
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/* Send Size-on-MDS Attributes if valid. */
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op_data->op_attr.ia_valid |= ATTR_MTIME_SET | ATTR_CTIME_SET |
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ATTR_ATIME_SET | ATTR_SIZE | ATTR_BLOCKS;
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}
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}
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/** Closes ioepoch and packs Size-on-MDS attribute if needed into @op_data. */
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void ll_ioepoch_close(struct inode *inode, struct md_op_data *op_data,
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struct obd_client_handle **och, unsigned long flags)
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{
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struct ll_inode_info *lli = ll_i2info(inode);
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struct ccc_object *club = cl2ccc(ll_i2info(inode)->lli_clob);
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spin_lock(&lli->lli_lock);
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if (!(list_empty(&club->cob_pending_list))) {
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if (!(lli->lli_flags & LLIF_EPOCH_PENDING)) {
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LASSERT(*och != NULL);
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LASSERT(lli->lli_pending_och == NULL);
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/* Inode is dirty and there is no pending write done
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* request yet, DONE_WRITE is to be sent later. */
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lli->lli_flags |= LLIF_EPOCH_PENDING;
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lli->lli_pending_och = *och;
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spin_unlock(&lli->lli_lock);
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inode = igrab(inode);
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LASSERT(inode);
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GOTO(out, 0);
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}
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if (flags & LLIF_DONE_WRITING) {
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/* Some pages are still dirty, it is early to send
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* DONE_WRITE. Wait until all pages will be flushed
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* and try DONE_WRITE again later. */
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LASSERT(!(lli->lli_flags & LLIF_DONE_WRITING));
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lli->lli_flags |= LLIF_DONE_WRITING;
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spin_unlock(&lli->lli_lock);
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inode = igrab(inode);
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LASSERT(inode);
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GOTO(out, 0);
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}
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}
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CDEBUG(D_INODE, "Epoch %llu closed on "DFID"\n",
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ll_i2info(inode)->lli_ioepoch, PFID(&lli->lli_fid));
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op_data->op_flags |= MF_EPOCH_CLOSE;
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if (flags & LLIF_DONE_WRITING) {
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LASSERT(lli->lli_flags & LLIF_SOM_DIRTY);
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LASSERT(!(lli->lli_flags & LLIF_DONE_WRITING));
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*och = lli->lli_pending_och;
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lli->lli_pending_och = NULL;
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lli->lli_flags &= ~LLIF_EPOCH_PENDING;
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} else {
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/* Pack Size-on-MDS inode attributes only if they has changed */
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if (!(lli->lli_flags & LLIF_SOM_DIRTY)) {
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spin_unlock(&lli->lli_lock);
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GOTO(out, 0);
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}
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/* There is a pending DONE_WRITE -- close epoch with no
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* attribute change. */
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if (lli->lli_flags & LLIF_EPOCH_PENDING) {
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spin_unlock(&lli->lli_lock);
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GOTO(out, 0);
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}
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}
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LASSERT(list_empty(&club->cob_pending_list));
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lli->lli_flags &= ~LLIF_SOM_DIRTY;
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spin_unlock(&lli->lli_lock);
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ll_done_writing_attr(inode, op_data);
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out:
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return;
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}
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/**
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* Cliens updates SOM attributes on MDS (including llog cookies):
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* obd_getattr with no lock and md_setattr.
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*/
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int ll_som_update(struct inode *inode, struct md_op_data *op_data)
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{
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struct ll_inode_info *lli = ll_i2info(inode);
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struct ptlrpc_request *request = NULL;
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__u32 old_flags;
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struct obdo *oa;
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int rc;
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LASSERT(op_data != NULL);
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if (lli->lli_flags & LLIF_MDS_SIZE_LOCK)
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CERROR("ino %lu/%u(flags %u) som valid it just after "
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"recovery\n", inode->i_ino, inode->i_generation,
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lli->lli_flags);
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OBDO_ALLOC(oa);
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if (!oa) {
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CERROR("can't allocate memory for Size-on-MDS update.\n");
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return -ENOMEM;
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}
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old_flags = op_data->op_flags;
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op_data->op_flags = MF_SOM_CHANGE;
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/* If inode is already in another epoch, skip getattr from OSTs. */
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if (lli->lli_ioepoch == op_data->op_ioepoch) {
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rc = ll_inode_getattr(inode, oa, op_data->op_ioepoch,
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old_flags & MF_GETATTR_LOCK);
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if (rc) {
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oa->o_valid = 0;
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if (rc != -ENOENT)
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CERROR("inode_getattr failed (%d): unable to "
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"send a Size-on-MDS attribute update "
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"for inode %lu/%u\n", rc, inode->i_ino,
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inode->i_generation);
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} else {
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CDEBUG(D_INODE, "Size-on-MDS update on "DFID"\n",
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PFID(&lli->lli_fid));
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}
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/* Install attributes into op_data. */
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md_from_obdo(op_data, oa, oa->o_valid);
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}
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rc = md_setattr(ll_i2sbi(inode)->ll_md_exp, op_data,
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NULL, 0, NULL, 0, &request, NULL);
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ptlrpc_req_finished(request);
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OBDO_FREE(oa);
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return rc;
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}
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/**
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* Closes the ioepoch and packs all the attributes into @op_data for
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* DONE_WRITING rpc.
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*/
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static void ll_prepare_done_writing(struct inode *inode,
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struct md_op_data *op_data,
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struct obd_client_handle **och)
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{
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ll_ioepoch_close(inode, op_data, och, LLIF_DONE_WRITING);
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/* If there is no @och, we do not do D_W yet. */
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if (*och == NULL)
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return;
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ll_pack_inode2opdata(inode, op_data, &(*och)->och_fh);
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ll_prep_md_op_data(op_data, inode, NULL, NULL,
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0, 0, LUSTRE_OPC_ANY, NULL);
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}
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/** Send a DONE_WRITING rpc. */
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static void ll_done_writing(struct inode *inode)
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{
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struct obd_client_handle *och = NULL;
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struct md_op_data *op_data;
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int rc;
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LASSERT(exp_connect_som(ll_i2mdexp(inode)));
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OBD_ALLOC_PTR(op_data);
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if (op_data == NULL) {
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CERROR("can't allocate op_data\n");
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return;
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}
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ll_prepare_done_writing(inode, op_data, &och);
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/* If there is no @och, we do not do D_W yet. */
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if (och == NULL)
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GOTO(out, 0);
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rc = md_done_writing(ll_i2sbi(inode)->ll_md_exp, op_data, NULL);
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if (rc == -EAGAIN) {
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/* MDS has instructed us to obtain Size-on-MDS attribute from
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* OSTs and send setattr to back to MDS. */
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rc = ll_som_update(inode, op_data);
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} else if (rc) {
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CERROR("inode %lu mdc done_writing failed: rc = %d\n",
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inode->i_ino, rc);
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}
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out:
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ll_finish_md_op_data(op_data);
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if (och) {
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md_clear_open_replay_data(ll_i2sbi(inode)->ll_md_exp, och);
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OBD_FREE_PTR(och);
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}
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}
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static struct ll_inode_info *ll_close_next_lli(struct ll_close_queue *lcq)
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{
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struct ll_inode_info *lli = NULL;
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spin_lock(&lcq->lcq_lock);
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if (!list_empty(&lcq->lcq_head)) {
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lli = list_entry(lcq->lcq_head.next, struct ll_inode_info,
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lli_close_list);
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list_del_init(&lli->lli_close_list);
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} else if (atomic_read(&lcq->lcq_stop))
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lli = ERR_PTR(-EALREADY);
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spin_unlock(&lcq->lcq_lock);
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return lli;
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}
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static int ll_close_thread(void *arg)
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{
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struct ll_close_queue *lcq = arg;
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complete(&lcq->lcq_comp);
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while (1) {
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struct l_wait_info lwi = { 0 };
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struct ll_inode_info *lli;
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struct inode *inode;
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l_wait_event_exclusive(lcq->lcq_waitq,
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(lli = ll_close_next_lli(lcq)) != NULL,
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&lwi);
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if (IS_ERR(lli))
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break;
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inode = ll_info2i(lli);
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CDEBUG(D_INFO, "done_writing for inode %lu/%u\n",
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inode->i_ino, inode->i_generation);
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ll_done_writing(inode);
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iput(inode);
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}
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CDEBUG(D_INFO, "ll_close exiting\n");
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complete(&lcq->lcq_comp);
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return 0;
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}
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int ll_close_thread_start(struct ll_close_queue **lcq_ret)
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{
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struct ll_close_queue *lcq;
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struct task_struct *task;
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if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CLOSE_THREAD))
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return -EINTR;
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OBD_ALLOC(lcq, sizeof(*lcq));
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if (lcq == NULL)
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return -ENOMEM;
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spin_lock_init(&lcq->lcq_lock);
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INIT_LIST_HEAD(&lcq->lcq_head);
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init_waitqueue_head(&lcq->lcq_waitq);
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init_completion(&lcq->lcq_comp);
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task = kthread_run(ll_close_thread, lcq, "ll_close");
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if (IS_ERR(task)) {
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OBD_FREE(lcq, sizeof(*lcq));
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return PTR_ERR(task);
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}
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wait_for_completion(&lcq->lcq_comp);
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*lcq_ret = lcq;
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return 0;
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}
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void ll_close_thread_shutdown(struct ll_close_queue *lcq)
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{
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init_completion(&lcq->lcq_comp);
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atomic_inc(&lcq->lcq_stop);
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wake_up(&lcq->lcq_waitq);
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wait_for_completion(&lcq->lcq_comp);
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OBD_FREE(lcq, sizeof(*lcq));
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}
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