1219 lines
34 KiB
C
1219 lines
34 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) 2008, 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, 2015, 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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* Implementation of cl_io for VVP layer.
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*
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* Author: Nikita Danilov <nikita.danilov@sun.com>
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* Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
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*/
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#define DEBUG_SUBSYSTEM S_LLITE
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#include "../include/obd.h"
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#include "../include/lustre_lite.h"
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#include "vvp_internal.h"
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static struct vvp_io *cl2vvp_io(const struct lu_env *env,
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const struct cl_io_slice *slice);
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/**
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* True, if \a io is a normal io, False for splice_{read,write}
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*/
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int cl_is_normalio(const struct lu_env *env, const struct cl_io *io)
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{
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struct vvp_io *vio = vvp_env_io(env);
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LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
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return vio->cui_io_subtype == IO_NORMAL;
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}
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/**
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* For swapping layout. The file's layout may have changed.
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* To avoid populating pages to a wrong stripe, we have to verify the
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* correctness of layout. It works because swapping layout processes
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* have to acquire group lock.
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*/
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static bool can_populate_pages(const struct lu_env *env, struct cl_io *io,
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struct inode *inode)
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{
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struct ll_inode_info *lli = ll_i2info(inode);
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struct ccc_io *cio = ccc_env_io(env);
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bool rc = true;
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switch (io->ci_type) {
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case CIT_READ:
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case CIT_WRITE:
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/* don't need lock here to check lli_layout_gen as we have held
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* extent lock and GROUP lock has to hold to swap layout
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*/
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if (ll_layout_version_get(lli) != cio->cui_layout_gen) {
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io->ci_need_restart = 1;
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/* this will return application a short read/write */
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io->ci_continue = 0;
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rc = false;
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}
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case CIT_FAULT:
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/* fault is okay because we've already had a page. */
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default:
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break;
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}
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return rc;
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}
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/*****************************************************************************
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*
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* io operations.
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*
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*/
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static int vvp_io_fault_iter_init(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct vvp_io *vio = cl2vvp_io(env, ios);
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struct inode *inode = ccc_object_inode(ios->cis_obj);
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LASSERT(inode ==
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file_inode(cl2ccc_io(env, ios)->cui_fd->fd_file));
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vio->u.fault.ft_mtime = inode->i_mtime.tv_sec;
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return 0;
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}
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static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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struct cl_object *obj = io->ci_obj;
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struct ccc_io *cio = cl2ccc_io(env, ios);
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CLOBINVRNT(env, obj, ccc_object_invariant(obj));
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CDEBUG(D_VFSTRACE, DFID
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" ignore/verify layout %d/%d, layout version %d restore needed %d\n",
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PFID(lu_object_fid(&obj->co_lu)),
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io->ci_ignore_layout, io->ci_verify_layout,
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cio->cui_layout_gen, io->ci_restore_needed);
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if (io->ci_restore_needed == 1) {
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int rc;
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/* file was detected release, we need to restore it
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* before finishing the io
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*/
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rc = ll_layout_restore(ccc_object_inode(obj));
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/* if restore registration failed, no restart,
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* we will return -ENODATA
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*/
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/* The layout will change after restore, so we need to
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* block on layout lock hold by the MDT
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* as MDT will not send new layout in lvb (see LU-3124)
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* we have to explicitly fetch it, all this will be done
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* by ll_layout_refresh()
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*/
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if (rc == 0) {
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io->ci_restore_needed = 0;
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io->ci_need_restart = 1;
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io->ci_verify_layout = 1;
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} else {
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io->ci_restore_needed = 1;
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io->ci_need_restart = 0;
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io->ci_verify_layout = 0;
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io->ci_result = rc;
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}
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}
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if (!io->ci_ignore_layout && io->ci_verify_layout) {
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__u32 gen = 0;
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/* check layout version */
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ll_layout_refresh(ccc_object_inode(obj), &gen);
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io->ci_need_restart = cio->cui_layout_gen != gen;
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if (io->ci_need_restart) {
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CDEBUG(D_VFSTRACE,
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DFID" layout changed from %d to %d.\n",
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PFID(lu_object_fid(&obj->co_lu)),
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cio->cui_layout_gen, gen);
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/* today successful restore is the only possible case */
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/* restore was done, clear restoring state */
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ll_i2info(ccc_object_inode(obj))->lli_flags &=
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~LLIF_FILE_RESTORING;
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}
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}
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}
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static void vvp_io_fault_fini(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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struct cl_page *page = io->u.ci_fault.ft_page;
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CLOBINVRNT(env, io->ci_obj, ccc_object_invariant(io->ci_obj));
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if (page) {
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lu_ref_del(&page->cp_reference, "fault", io);
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cl_page_put(env, page);
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io->u.ci_fault.ft_page = NULL;
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}
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vvp_io_fini(env, ios);
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}
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static enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma)
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{
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/*
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* we only want to hold PW locks if the mmap() can generate
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* writes back to the file and that only happens in shared
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* writable vmas
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*/
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if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE))
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return CLM_WRITE;
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return CLM_READ;
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}
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static int vvp_mmap_locks(const struct lu_env *env,
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struct ccc_io *vio, struct cl_io *io)
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{
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struct ccc_thread_info *cti = ccc_env_info(env);
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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struct cl_lock_descr *descr = &cti->cti_descr;
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ldlm_policy_data_t policy;
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unsigned long addr;
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ssize_t count;
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int result;
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struct iov_iter i;
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struct iovec iov;
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LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
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if (!cl_is_normalio(env, io))
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return 0;
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if (!vio->cui_iter) /* nfs or loop back device write */
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return 0;
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/* No MM (e.g. NFS)? No vmas too. */
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if (!mm)
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return 0;
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iov_for_each(iov, i, *(vio->cui_iter)) {
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addr = (unsigned long)iov.iov_base;
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count = iov.iov_len;
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if (count == 0)
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continue;
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count += addr & (~CFS_PAGE_MASK);
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addr &= CFS_PAGE_MASK;
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down_read(&mm->mmap_sem);
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while ((vma = our_vma(mm, addr, count)) != NULL) {
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struct inode *inode = file_inode(vma->vm_file);
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int flags = CEF_MUST;
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if (ll_file_nolock(vma->vm_file)) {
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/*
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* For no lock case, a lockless lock will be
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* generated.
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*/
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flags = CEF_NEVER;
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}
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/*
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* XXX: Required lock mode can be weakened: CIT_WRITE
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* io only ever reads user level buffer, and CIT_READ
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* only writes on it.
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*/
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policy_from_vma(&policy, vma, addr, count);
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descr->cld_mode = vvp_mode_from_vma(vma);
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descr->cld_obj = ll_i2info(inode)->lli_clob;
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descr->cld_start = cl_index(descr->cld_obj,
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policy.l_extent.start);
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descr->cld_end = cl_index(descr->cld_obj,
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policy.l_extent.end);
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descr->cld_enq_flags = flags;
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result = cl_io_lock_alloc_add(env, io, descr);
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CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n",
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descr->cld_mode, descr->cld_start,
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descr->cld_end);
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if (result < 0) {
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up_read(&mm->mmap_sem);
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return result;
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}
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if (vma->vm_end - addr >= count)
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break;
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count -= vma->vm_end - addr;
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addr = vma->vm_end;
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}
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up_read(&mm->mmap_sem);
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}
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return 0;
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}
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static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
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enum cl_lock_mode mode, loff_t start, loff_t end)
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{
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struct ccc_io *cio = ccc_env_io(env);
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int result;
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int ast_flags = 0;
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LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
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ccc_io_update_iov(env, cio, io);
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if (io->u.ci_rw.crw_nonblock)
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ast_flags |= CEF_NONBLOCK;
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result = vvp_mmap_locks(env, cio, io);
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if (result == 0)
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result = ccc_io_one_lock(env, io, ast_flags, mode, start, end);
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return result;
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}
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static int vvp_io_read_lock(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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struct cl_io_rw_common *rd = &io->u.ci_rd.rd;
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int result;
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result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos,
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rd->crw_pos + rd->crw_count - 1);
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return result;
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}
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static int vvp_io_fault_lock(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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struct vvp_io *vio = cl2vvp_io(env, ios);
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/*
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* XXX LDLM_FL_CBPENDING
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*/
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return ccc_io_one_lock_index
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(env, io, 0, vvp_mode_from_vma(vio->u.fault.ft_vma),
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io->u.ci_fault.ft_index, io->u.ci_fault.ft_index);
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}
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static int vvp_io_write_lock(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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loff_t start;
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loff_t end;
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if (io->u.ci_wr.wr_append) {
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start = 0;
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end = OBD_OBJECT_EOF;
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} else {
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start = io->u.ci_wr.wr.crw_pos;
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end = start + io->u.ci_wr.wr.crw_count - 1;
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}
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return vvp_io_rw_lock(env, io, CLM_WRITE, start, end);
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}
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static int vvp_io_setattr_iter_init(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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return 0;
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}
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/**
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* Implementation of cl_io_operations::cio_lock() method for CIT_SETATTR io.
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*
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* Handles "lockless io" mode when extent locking is done by server.
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*/
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static int vvp_io_setattr_lock(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct ccc_io *cio = ccc_env_io(env);
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struct cl_io *io = ios->cis_io;
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__u64 new_size;
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__u32 enqflags = 0;
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if (cl_io_is_trunc(io)) {
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new_size = io->u.ci_setattr.sa_attr.lvb_size;
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if (new_size == 0)
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enqflags = CEF_DISCARD_DATA;
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} else {
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if ((io->u.ci_setattr.sa_attr.lvb_mtime >=
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io->u.ci_setattr.sa_attr.lvb_ctime) ||
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(io->u.ci_setattr.sa_attr.lvb_atime >=
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io->u.ci_setattr.sa_attr.lvb_ctime))
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return 0;
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new_size = 0;
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}
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cio->u.setattr.cui_local_lock = SETATTR_EXTENT_LOCK;
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return ccc_io_one_lock(env, io, enqflags, CLM_WRITE,
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new_size, OBD_OBJECT_EOF);
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}
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static int vvp_do_vmtruncate(struct inode *inode, size_t size)
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{
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int result;
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/*
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* Only ll_inode_size_lock is taken at this level.
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*/
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ll_inode_size_lock(inode);
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result = inode_newsize_ok(inode, size);
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if (result < 0) {
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ll_inode_size_unlock(inode);
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return result;
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}
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truncate_setsize(inode, size);
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ll_inode_size_unlock(inode);
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return result;
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}
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static int vvp_io_setattr_trunc(const struct lu_env *env,
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const struct cl_io_slice *ios,
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struct inode *inode, loff_t size)
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{
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inode_dio_wait(inode);
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return 0;
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}
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static int vvp_io_setattr_time(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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struct cl_object *obj = io->ci_obj;
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struct cl_attr *attr = ccc_env_thread_attr(env);
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int result;
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unsigned valid = CAT_CTIME;
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cl_object_attr_lock(obj);
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attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime;
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if (io->u.ci_setattr.sa_valid & ATTR_ATIME_SET) {
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attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
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valid |= CAT_ATIME;
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}
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if (io->u.ci_setattr.sa_valid & ATTR_MTIME_SET) {
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attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
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valid |= CAT_MTIME;
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}
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result = cl_object_attr_set(env, obj, attr, valid);
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cl_object_attr_unlock(obj);
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return result;
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}
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static int vvp_io_setattr_start(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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struct inode *inode = ccc_object_inode(io->ci_obj);
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int result = 0;
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inode_lock(inode);
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if (cl_io_is_trunc(io))
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result = vvp_io_setattr_trunc(env, ios, inode,
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io->u.ci_setattr.sa_attr.lvb_size);
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if (result == 0)
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result = vvp_io_setattr_time(env, ios);
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return result;
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}
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static void vvp_io_setattr_end(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct cl_io *io = ios->cis_io;
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struct inode *inode = ccc_object_inode(io->ci_obj);
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if (cl_io_is_trunc(io))
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/* Truncate in memory pages - they must be clean pages
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* because osc has already notified to destroy osc_extents.
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*/
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vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
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inode_unlock(inode);
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}
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static void vvp_io_setattr_fini(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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vvp_io_fini(env, ios);
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}
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static int vvp_io_read_start(const struct lu_env *env,
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const struct cl_io_slice *ios)
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{
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struct vvp_io *vio = cl2vvp_io(env, ios);
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struct ccc_io *cio = cl2ccc_io(env, ios);
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struct cl_io *io = ios->cis_io;
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struct cl_object *obj = io->ci_obj;
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struct inode *inode = ccc_object_inode(obj);
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struct ll_ra_read *bead = &vio->cui_bead;
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struct file *file = cio->cui_fd->fd_file;
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int result;
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loff_t pos = io->u.ci_rd.rd.crw_pos;
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long cnt = io->u.ci_rd.rd.crw_count;
|
|
long tot = cio->cui_tot_count;
|
|
int exceed = 0;
|
|
|
|
CLOBINVRNT(env, obj, ccc_object_invariant(obj));
|
|
|
|
CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt);
|
|
|
|
if (!can_populate_pages(env, io, inode))
|
|
return 0;
|
|
|
|
result = ccc_prep_size(env, obj, io, pos, tot, &exceed);
|
|
if (result != 0)
|
|
return result;
|
|
else if (exceed != 0)
|
|
goto out;
|
|
|
|
LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
|
|
"Read ino %lu, %lu bytes, offset %lld, size %llu\n",
|
|
inode->i_ino, cnt, pos, i_size_read(inode));
|
|
|
|
/* turn off the kernel's read-ahead */
|
|
cio->cui_fd->fd_file->f_ra.ra_pages = 0;
|
|
|
|
/* initialize read-ahead window once per syscall */
|
|
if (!vio->cui_ra_window_set) {
|
|
vio->cui_ra_window_set = 1;
|
|
bead->lrr_start = cl_index(obj, pos);
|
|
/*
|
|
* XXX: explicit PAGE_CACHE_SIZE
|
|
*/
|
|
bead->lrr_count = cl_index(obj, tot + PAGE_SIZE - 1);
|
|
ll_ra_read_in(file, bead);
|
|
}
|
|
|
|
/* BUG: 5972 */
|
|
file_accessed(file);
|
|
switch (vio->cui_io_subtype) {
|
|
case IO_NORMAL:
|
|
LASSERT(cio->cui_iocb->ki_pos == pos);
|
|
result = generic_file_read_iter(cio->cui_iocb, cio->cui_iter);
|
|
break;
|
|
case IO_SPLICE:
|
|
result = generic_file_splice_read(file, &pos,
|
|
vio->u.splice.cui_pipe, cnt,
|
|
vio->u.splice.cui_flags);
|
|
/* LU-1109: do splice read stripe by stripe otherwise if it
|
|
* may make nfsd stuck if this read occupied all internal pipe
|
|
* buffers.
|
|
*/
|
|
io->ci_continue = 0;
|
|
break;
|
|
default:
|
|
CERROR("Wrong IO type %u\n", vio->cui_io_subtype);
|
|
LBUG();
|
|
}
|
|
|
|
out:
|
|
if (result >= 0) {
|
|
if (result < cnt)
|
|
io->ci_continue = 0;
|
|
io->ci_nob += result;
|
|
ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
|
|
cio->cui_fd, pos, result, READ);
|
|
result = 0;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static void vvp_io_read_fini(const struct lu_env *env, const struct cl_io_slice *ios)
|
|
{
|
|
struct vvp_io *vio = cl2vvp_io(env, ios);
|
|
struct ccc_io *cio = cl2ccc_io(env, ios);
|
|
|
|
if (vio->cui_ra_window_set)
|
|
ll_ra_read_ex(cio->cui_fd->fd_file, &vio->cui_bead);
|
|
|
|
vvp_io_fini(env, ios);
|
|
}
|
|
|
|
static int vvp_io_write_start(const struct lu_env *env,
|
|
const struct cl_io_slice *ios)
|
|
{
|
|
struct ccc_io *cio = cl2ccc_io(env, ios);
|
|
struct cl_io *io = ios->cis_io;
|
|
struct cl_object *obj = io->ci_obj;
|
|
struct inode *inode = ccc_object_inode(obj);
|
|
ssize_t result = 0;
|
|
loff_t pos = io->u.ci_wr.wr.crw_pos;
|
|
size_t cnt = io->u.ci_wr.wr.crw_count;
|
|
|
|
if (!can_populate_pages(env, io, inode))
|
|
return 0;
|
|
|
|
if (cl_io_is_append(io)) {
|
|
/*
|
|
* PARALLEL IO This has to be changed for parallel IO doing
|
|
* out-of-order writes.
|
|
*/
|
|
pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
|
|
cio->cui_iocb->ki_pos = pos;
|
|
} else {
|
|
LASSERT(cio->cui_iocb->ki_pos == pos);
|
|
}
|
|
|
|
CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
|
|
|
|
if (!cio->cui_iter) /* from a temp io in ll_cl_init(). */
|
|
result = 0;
|
|
else
|
|
result = generic_file_write_iter(cio->cui_iocb, cio->cui_iter);
|
|
|
|
if (result > 0) {
|
|
if (result < cnt)
|
|
io->ci_continue = 0;
|
|
io->ci_nob += result;
|
|
ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
|
|
cio->cui_fd, pos, result, WRITE);
|
|
result = 0;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
|
|
{
|
|
struct vm_fault *vmf = cfio->fault.ft_vmf;
|
|
|
|
cfio->fault.ft_flags = filemap_fault(cfio->ft_vma, vmf);
|
|
cfio->fault.ft_flags_valid = 1;
|
|
|
|
if (vmf->page) {
|
|
CDEBUG(D_PAGE,
|
|
"page %p map %p index %lu flags %lx count %u priv %0lx: got addr %p type NOPAGE\n",
|
|
vmf->page, vmf->page->mapping, vmf->page->index,
|
|
(long)vmf->page->flags, page_count(vmf->page),
|
|
page_private(vmf->page), vmf->virtual_address);
|
|
if (unlikely(!(cfio->fault.ft_flags & VM_FAULT_LOCKED))) {
|
|
lock_page(vmf->page);
|
|
cfio->fault.ft_flags |= VM_FAULT_LOCKED;
|
|
}
|
|
|
|
cfio->ft_vmpage = vmf->page;
|
|
return 0;
|
|
}
|
|
|
|
if (cfio->fault.ft_flags & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
|
|
CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", vmf->virtual_address);
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (cfio->fault.ft_flags & VM_FAULT_OOM) {
|
|
CDEBUG(D_PAGE, "got addr %p - OOM\n", vmf->virtual_address);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (cfio->fault.ft_flags & VM_FAULT_RETRY)
|
|
return -EAGAIN;
|
|
|
|
CERROR("Unknown error in page fault %d!\n", cfio->fault.ft_flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int vvp_io_fault_start(const struct lu_env *env,
|
|
const struct cl_io_slice *ios)
|
|
{
|
|
struct vvp_io *vio = cl2vvp_io(env, ios);
|
|
struct cl_io *io = ios->cis_io;
|
|
struct cl_object *obj = io->ci_obj;
|
|
struct inode *inode = ccc_object_inode(obj);
|
|
struct cl_fault_io *fio = &io->u.ci_fault;
|
|
struct vvp_fault_io *cfio = &vio->u.fault;
|
|
loff_t offset;
|
|
int result = 0;
|
|
struct page *vmpage = NULL;
|
|
struct cl_page *page;
|
|
loff_t size;
|
|
pgoff_t last; /* last page in a file data region */
|
|
|
|
if (fio->ft_executable &&
|
|
inode->i_mtime.tv_sec != vio->u.fault.ft_mtime)
|
|
CWARN("binary "DFID
|
|
" changed while waiting for the page fault lock\n",
|
|
PFID(lu_object_fid(&obj->co_lu)));
|
|
|
|
/* offset of the last byte on the page */
|
|
offset = cl_offset(obj, fio->ft_index + 1) - 1;
|
|
LASSERT(cl_index(obj, offset) == fio->ft_index);
|
|
result = ccc_prep_size(env, obj, io, 0, offset + 1, NULL);
|
|
if (result != 0)
|
|
return result;
|
|
|
|
/* must return locked page */
|
|
if (fio->ft_mkwrite) {
|
|
LASSERT(cfio->ft_vmpage);
|
|
lock_page(cfio->ft_vmpage);
|
|
} else {
|
|
result = vvp_io_kernel_fault(cfio);
|
|
if (result != 0)
|
|
return result;
|
|
}
|
|
|
|
vmpage = cfio->ft_vmpage;
|
|
LASSERT(PageLocked(vmpage));
|
|
|
|
if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
|
|
ll_invalidate_page(vmpage);
|
|
|
|
size = i_size_read(inode);
|
|
/* Though we have already held a cl_lock upon this page, but
|
|
* it still can be truncated locally.
|
|
*/
|
|
if (unlikely((vmpage->mapping != inode->i_mapping) ||
|
|
(page_offset(vmpage) > size))) {
|
|
CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n");
|
|
|
|
/* return +1 to stop cl_io_loop() and ll_fault() will catch
|
|
* and retry.
|
|
*/
|
|
result = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (fio->ft_mkwrite) {
|
|
pgoff_t last_index;
|
|
/*
|
|
* Capture the size while holding the lli_trunc_sem from above
|
|
* we want to make sure that we complete the mkwrite action
|
|
* while holding this lock. We need to make sure that we are
|
|
* not past the end of the file.
|
|
*/
|
|
last_index = cl_index(obj, size - 1);
|
|
if (last_index < fio->ft_index) {
|
|
CDEBUG(D_PAGE,
|
|
"llite: mkwrite and truncate race happened: %p: 0x%lx 0x%lx\n",
|
|
vmpage->mapping, fio->ft_index, last_index);
|
|
/*
|
|
* We need to return if we are
|
|
* passed the end of the file. This will propagate
|
|
* up the call stack to ll_page_mkwrite where
|
|
* we will return VM_FAULT_NOPAGE. Any non-negative
|
|
* value returned here will be silently
|
|
* converted to 0. If the vmpage->mapping is null
|
|
* the error code would be converted back to ENODATA
|
|
* in ll_page_mkwrite0. Thus we return -ENODATA
|
|
* to handle both cases
|
|
*/
|
|
result = -ENODATA;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE);
|
|
if (IS_ERR(page)) {
|
|
result = PTR_ERR(page);
|
|
goto out;
|
|
}
|
|
|
|
/* if page is going to be written, we should add this page into cache
|
|
* earlier.
|
|
*/
|
|
if (fio->ft_mkwrite) {
|
|
wait_on_page_writeback(vmpage);
|
|
if (set_page_dirty(vmpage)) {
|
|
struct ccc_page *cp;
|
|
|
|
/* vvp_page_assume() calls wait_on_page_writeback(). */
|
|
cl_page_assume(env, io, page);
|
|
|
|
cp = cl2ccc_page(cl_page_at(page, &vvp_device_type));
|
|
vvp_write_pending(cl2ccc(obj), cp);
|
|
|
|
/* Do not set Dirty bit here so that in case IO is
|
|
* started before the page is really made dirty, we
|
|
* still have chance to detect it.
|
|
*/
|
|
result = cl_page_cache_add(env, io, page, CRT_WRITE);
|
|
LASSERT(cl_page_is_owned(page, io));
|
|
|
|
vmpage = NULL;
|
|
if (result < 0) {
|
|
cl_page_unmap(env, io, page);
|
|
cl_page_discard(env, io, page);
|
|
cl_page_disown(env, io, page);
|
|
|
|
cl_page_put(env, page);
|
|
|
|
/* we're in big trouble, what can we do now? */
|
|
if (result == -EDQUOT)
|
|
result = -ENOSPC;
|
|
goto out;
|
|
} else
|
|
cl_page_disown(env, io, page);
|
|
}
|
|
}
|
|
|
|
last = cl_index(obj, size - 1);
|
|
/*
|
|
* The ft_index is only used in the case of
|
|
* a mkwrite action. We need to check
|
|
* our assertions are correct, since
|
|
* we should have caught this above
|
|
*/
|
|
LASSERT(!fio->ft_mkwrite || fio->ft_index <= last);
|
|
if (fio->ft_index == last)
|
|
/*
|
|
* Last page is mapped partially.
|
|
*/
|
|
fio->ft_nob = size - cl_offset(obj, fio->ft_index);
|
|
else
|
|
fio->ft_nob = cl_page_size(obj);
|
|
|
|
lu_ref_add(&page->cp_reference, "fault", io);
|
|
fio->ft_page = page;
|
|
|
|
out:
|
|
/* return unlocked vmpage to avoid deadlocking */
|
|
if (vmpage)
|
|
unlock_page(vmpage);
|
|
cfio->fault.ft_flags &= ~VM_FAULT_LOCKED;
|
|
return result;
|
|
}
|
|
|
|
static int vvp_io_fsync_start(const struct lu_env *env,
|
|
const struct cl_io_slice *ios)
|
|
{
|
|
/* we should mark TOWRITE bit to each dirty page in radix tree to
|
|
* verify pages have been written, but this is difficult because of
|
|
* race.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int vvp_io_read_page(const struct lu_env *env,
|
|
const struct cl_io_slice *ios,
|
|
const struct cl_page_slice *slice)
|
|
{
|
|
struct cl_io *io = ios->cis_io;
|
|
struct cl_object *obj = slice->cpl_obj;
|
|
struct ccc_page *cp = cl2ccc_page(slice);
|
|
struct cl_page *page = slice->cpl_page;
|
|
struct inode *inode = ccc_object_inode(obj);
|
|
struct ll_sb_info *sbi = ll_i2sbi(inode);
|
|
struct ll_file_data *fd = cl2ccc_io(env, ios)->cui_fd;
|
|
struct ll_readahead_state *ras = &fd->fd_ras;
|
|
struct page *vmpage = cp->cpg_page;
|
|
struct cl_2queue *queue = &io->ci_queue;
|
|
int rc;
|
|
|
|
CLOBINVRNT(env, obj, ccc_object_invariant(obj));
|
|
LASSERT(slice->cpl_obj == obj);
|
|
|
|
if (sbi->ll_ra_info.ra_max_pages_per_file &&
|
|
sbi->ll_ra_info.ra_max_pages)
|
|
ras_update(sbi, inode, ras, page->cp_index,
|
|
cp->cpg_defer_uptodate);
|
|
|
|
/* Sanity check whether the page is protected by a lock. */
|
|
rc = cl_page_is_under_lock(env, io, page);
|
|
if (rc != -EBUSY) {
|
|
CL_PAGE_HEADER(D_WARNING, env, page, "%s: %d\n",
|
|
rc == -ENODATA ? "without a lock" :
|
|
"match failed", rc);
|
|
if (rc != -ENODATA)
|
|
return rc;
|
|
}
|
|
|
|
if (cp->cpg_defer_uptodate) {
|
|
cp->cpg_ra_used = 1;
|
|
cl_page_export(env, page, 1);
|
|
}
|
|
/*
|
|
* Add page into the queue even when it is marked uptodate above.
|
|
* this will unlock it automatically as part of cl_page_list_disown().
|
|
*/
|
|
cl_page_list_add(&queue->c2_qin, page);
|
|
if (sbi->ll_ra_info.ra_max_pages_per_file &&
|
|
sbi->ll_ra_info.ra_max_pages)
|
|
ll_readahead(env, io, ras,
|
|
vmpage->mapping, &queue->c2_qin, fd->fd_flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vvp_page_sync_io(const struct lu_env *env, struct cl_io *io,
|
|
struct cl_page *page, struct ccc_page *cp,
|
|
enum cl_req_type crt)
|
|
{
|
|
struct cl_2queue *queue;
|
|
int result;
|
|
|
|
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
|
|
|
|
queue = &io->ci_queue;
|
|
cl_2queue_init_page(queue, page);
|
|
|
|
result = cl_io_submit_sync(env, io, crt, queue, 0);
|
|
LASSERT(cl_page_is_owned(page, io));
|
|
|
|
if (crt == CRT_READ)
|
|
/*
|
|
* in CRT_WRITE case page is left locked even in case of
|
|
* error.
|
|
*/
|
|
cl_page_list_disown(env, io, &queue->c2_qin);
|
|
cl_2queue_fini(env, queue);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Prepare partially written-to page for a write.
|
|
*/
|
|
static int vvp_io_prepare_partial(const struct lu_env *env, struct cl_io *io,
|
|
struct cl_object *obj, struct cl_page *pg,
|
|
struct ccc_page *cp,
|
|
unsigned from, unsigned to)
|
|
{
|
|
struct cl_attr *attr = ccc_env_thread_attr(env);
|
|
loff_t offset = cl_offset(obj, pg->cp_index);
|
|
int result;
|
|
|
|
cl_object_attr_lock(obj);
|
|
result = cl_object_attr_get(env, obj, attr);
|
|
cl_object_attr_unlock(obj);
|
|
if (result == 0) {
|
|
/*
|
|
* If are writing to a new page, no need to read old data.
|
|
* The extent locking will have updated the KMS, and for our
|
|
* purposes here we can treat it like i_size.
|
|
*/
|
|
if (attr->cat_kms <= offset) {
|
|
char *kaddr = kmap_atomic(cp->cpg_page);
|
|
|
|
memset(kaddr, 0, cl_page_size(obj));
|
|
kunmap_atomic(kaddr);
|
|
} else if (cp->cpg_defer_uptodate)
|
|
cp->cpg_ra_used = 1;
|
|
else
|
|
result = vvp_page_sync_io(env, io, pg, cp, CRT_READ);
|
|
/*
|
|
* In older implementations, obdo_refresh_inode is called here
|
|
* to update the inode because the write might modify the
|
|
* object info at OST. However, this has been proven useless,
|
|
* since LVB functions will be called when user space program
|
|
* tries to retrieve inode attribute. Also, see bug 15909 for
|
|
* details. -jay
|
|
*/
|
|
if (result == 0)
|
|
cl_page_export(env, pg, 1);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static int vvp_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 cl_object *obj = slice->cpl_obj;
|
|
struct ccc_page *cp = cl2ccc_page(slice);
|
|
struct cl_page *pg = slice->cpl_page;
|
|
struct page *vmpage = cp->cpg_page;
|
|
|
|
int result;
|
|
|
|
LINVRNT(cl_page_is_vmlocked(env, pg));
|
|
LASSERT(vmpage->mapping->host == ccc_object_inode(obj));
|
|
|
|
result = 0;
|
|
|
|
CL_PAGE_HEADER(D_PAGE, env, pg, "preparing: [%d, %d]\n", from, to);
|
|
if (!PageUptodate(vmpage)) {
|
|
/*
|
|
* We're completely overwriting an existing page, so _don't_
|
|
* set it up to date until commit_write
|
|
*/
|
|
if (from == 0 && to == PAGE_SIZE) {
|
|
CL_PAGE_HEADER(D_PAGE, env, pg, "full page write\n");
|
|
POISON_PAGE(page, 0x11);
|
|
} else
|
|
result = vvp_io_prepare_partial(env, ios->cis_io, obj,
|
|
pg, cp, from, to);
|
|
} else
|
|
CL_PAGE_HEADER(D_PAGE, env, pg, "uptodate\n");
|
|
return result;
|
|
}
|
|
|
|
static int vvp_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 cl_object *obj = slice->cpl_obj;
|
|
struct cl_io *io = ios->cis_io;
|
|
struct ccc_page *cp = cl2ccc_page(slice);
|
|
struct cl_page *pg = slice->cpl_page;
|
|
struct inode *inode = ccc_object_inode(obj);
|
|
struct ll_sb_info *sbi = ll_i2sbi(inode);
|
|
struct ll_inode_info *lli = ll_i2info(inode);
|
|
struct page *vmpage = cp->cpg_page;
|
|
|
|
int result;
|
|
int tallyop;
|
|
loff_t size;
|
|
|
|
LINVRNT(cl_page_is_vmlocked(env, pg));
|
|
LASSERT(vmpage->mapping->host == inode);
|
|
|
|
LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, "committing page write\n");
|
|
CL_PAGE_HEADER(D_PAGE, env, pg, "committing: [%d, %d]\n", from, to);
|
|
|
|
/*
|
|
* queue a write for some time in the future the first time we
|
|
* dirty the page.
|
|
*
|
|
* This is different from what other file systems do: they usually
|
|
* just mark page (and some of its buffers) dirty and rely on
|
|
* balance_dirty_pages() to start a write-back. Lustre wants write-back
|
|
* to be started earlier for the following reasons:
|
|
*
|
|
* (1) with a large number of clients we need to limit the amount
|
|
* of cached data on the clients a lot;
|
|
*
|
|
* (2) large compute jobs generally want compute-only then io-only
|
|
* and the IO should complete as quickly as possible;
|
|
*
|
|
* (3) IO is batched up to the RPC size and is async until the
|
|
* client max cache is hit
|
|
* (/sys/fs/lustre/osc/OSC.../max_dirty_mb)
|
|
*
|
|
*/
|
|
if (!PageDirty(vmpage)) {
|
|
tallyop = LPROC_LL_DIRTY_MISSES;
|
|
result = cl_page_cache_add(env, io, pg, CRT_WRITE);
|
|
if (result == 0) {
|
|
/* page was added into cache successfully. */
|
|
set_page_dirty(vmpage);
|
|
vvp_write_pending(cl2ccc(obj), cp);
|
|
} else if (result == -EDQUOT) {
|
|
pgoff_t last_index = i_size_read(inode) >> PAGE_SHIFT;
|
|
bool need_clip = true;
|
|
|
|
/*
|
|
* Client ran out of disk space grant. Possible
|
|
* strategies are:
|
|
*
|
|
* (a) do a sync write, renewing grant;
|
|
*
|
|
* (b) stop writing on this stripe, switch to the
|
|
* next one.
|
|
*
|
|
* (b) is a part of "parallel io" design that is the
|
|
* ultimate goal. (a) is what "old" client did, and
|
|
* what the new code continues to do for the time
|
|
* being.
|
|
*/
|
|
if (last_index > pg->cp_index) {
|
|
to = PAGE_SIZE;
|
|
need_clip = false;
|
|
} else if (last_index == pg->cp_index) {
|
|
int size_to = i_size_read(inode) & ~CFS_PAGE_MASK;
|
|
|
|
if (to < size_to)
|
|
to = size_to;
|
|
}
|
|
if (need_clip)
|
|
cl_page_clip(env, pg, 0, to);
|
|
result = vvp_page_sync_io(env, io, pg, cp, CRT_WRITE);
|
|
if (result)
|
|
CERROR("Write page %lu of inode %p failed %d\n",
|
|
pg->cp_index, inode, result);
|
|
}
|
|
} else {
|
|
tallyop = LPROC_LL_DIRTY_HITS;
|
|
result = 0;
|
|
}
|
|
ll_stats_ops_tally(sbi, tallyop, 1);
|
|
|
|
/* Inode should be marked DIRTY even if no new page was marked DIRTY
|
|
* because page could have been not flushed between 2 modifications.
|
|
* It is important the file is marked DIRTY as soon as the I/O is done
|
|
* Indeed, when cache is flushed, file could be already closed and it
|
|
* is too late to warn the MDT.
|
|
* It is acceptable that file is marked DIRTY even if I/O is dropped
|
|
* for some reasons before being flushed to OST.
|
|
*/
|
|
if (result == 0) {
|
|
spin_lock(&lli->lli_lock);
|
|
lli->lli_flags |= LLIF_DATA_MODIFIED;
|
|
spin_unlock(&lli->lli_lock);
|
|
}
|
|
|
|
size = cl_offset(obj, pg->cp_index) + to;
|
|
|
|
ll_inode_size_lock(inode);
|
|
if (result == 0) {
|
|
if (size > i_size_read(inode)) {
|
|
cl_isize_write_nolock(inode, size);
|
|
CDEBUG(D_VFSTRACE, DFID" updating i_size %lu\n",
|
|
PFID(lu_object_fid(&obj->co_lu)),
|
|
(unsigned long)size);
|
|
}
|
|
cl_page_export(env, pg, 1);
|
|
} else {
|
|
if (size > i_size_read(inode))
|
|
cl_page_discard(env, io, pg);
|
|
}
|
|
ll_inode_size_unlock(inode);
|
|
return result;
|
|
}
|
|
|
|
static const struct cl_io_operations vvp_io_ops = {
|
|
.op = {
|
|
[CIT_READ] = {
|
|
.cio_fini = vvp_io_read_fini,
|
|
.cio_lock = vvp_io_read_lock,
|
|
.cio_start = vvp_io_read_start,
|
|
.cio_advance = ccc_io_advance
|
|
},
|
|
[CIT_WRITE] = {
|
|
.cio_fini = vvp_io_fini,
|
|
.cio_lock = vvp_io_write_lock,
|
|
.cio_start = vvp_io_write_start,
|
|
.cio_advance = ccc_io_advance
|
|
},
|
|
[CIT_SETATTR] = {
|
|
.cio_fini = vvp_io_setattr_fini,
|
|
.cio_iter_init = vvp_io_setattr_iter_init,
|
|
.cio_lock = vvp_io_setattr_lock,
|
|
.cio_start = vvp_io_setattr_start,
|
|
.cio_end = vvp_io_setattr_end
|
|
},
|
|
[CIT_FAULT] = {
|
|
.cio_fini = vvp_io_fault_fini,
|
|
.cio_iter_init = vvp_io_fault_iter_init,
|
|
.cio_lock = vvp_io_fault_lock,
|
|
.cio_start = vvp_io_fault_start,
|
|
.cio_end = ccc_io_end
|
|
},
|
|
[CIT_FSYNC] = {
|
|
.cio_start = vvp_io_fsync_start,
|
|
.cio_fini = vvp_io_fini
|
|
},
|
|
[CIT_MISC] = {
|
|
.cio_fini = vvp_io_fini
|
|
}
|
|
},
|
|
.cio_read_page = vvp_io_read_page,
|
|
.cio_prepare_write = vvp_io_prepare_write,
|
|
.cio_commit_write = vvp_io_commit_write
|
|
};
|
|
|
|
int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
|
|
struct cl_io *io)
|
|
{
|
|
struct vvp_io *vio = vvp_env_io(env);
|
|
struct ccc_io *cio = ccc_env_io(env);
|
|
struct inode *inode = ccc_object_inode(obj);
|
|
int result;
|
|
|
|
CLOBINVRNT(env, obj, ccc_object_invariant(obj));
|
|
|
|
CDEBUG(D_VFSTRACE, DFID
|
|
" ignore/verify layout %d/%d, layout version %d restore needed %d\n",
|
|
PFID(lu_object_fid(&obj->co_lu)),
|
|
io->ci_ignore_layout, io->ci_verify_layout,
|
|
cio->cui_layout_gen, io->ci_restore_needed);
|
|
|
|
CL_IO_SLICE_CLEAN(cio, cui_cl);
|
|
cl_io_slice_add(io, &cio->cui_cl, obj, &vvp_io_ops);
|
|
vio->cui_ra_window_set = 0;
|
|
result = 0;
|
|
if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) {
|
|
size_t count;
|
|
struct ll_inode_info *lli = ll_i2info(inode);
|
|
|
|
count = io->u.ci_rw.crw_count;
|
|
/* "If nbyte is 0, read() will return 0 and have no other
|
|
* results." -- Single Unix Spec
|
|
*/
|
|
if (count == 0)
|
|
result = 1;
|
|
else
|
|
cio->cui_tot_count = count;
|
|
|
|
/* for read/write, we store the jobid in the inode, and
|
|
* it'll be fetched by osc when building RPC.
|
|
*
|
|
* it's not accurate if the file is shared by different
|
|
* jobs.
|
|
*/
|
|
lustre_get_jobid(lli->lli_jobid);
|
|
} else if (io->ci_type == CIT_SETATTR) {
|
|
if (!cl_io_is_trunc(io))
|
|
io->ci_lockreq = CILR_MANDATORY;
|
|
}
|
|
|
|
/* ignore layout change for generic CIT_MISC but not for glimpse.
|
|
* io context for glimpse must set ci_verify_layout to true,
|
|
* see cl_glimpse_size0() for details.
|
|
*/
|
|
if (io->ci_type == CIT_MISC && !io->ci_verify_layout)
|
|
io->ci_ignore_layout = 1;
|
|
|
|
/* Enqueue layout lock and get layout version. We need to do this
|
|
* even for operations requiring to open file, such as read and write,
|
|
* because it might not grant layout lock in IT_OPEN.
|
|
*/
|
|
if (result == 0 && !io->ci_ignore_layout) {
|
|
result = ll_layout_refresh(inode, &cio->cui_layout_gen);
|
|
if (result == -ENOENT)
|
|
/* If the inode on MDS has been removed, but the objects
|
|
* on OSTs haven't been destroyed (async unlink), layout
|
|
* fetch will return -ENOENT, we'd ignore this error
|
|
* and continue with dirty flush. LU-3230.
|
|
*/
|
|
result = 0;
|
|
if (result < 0)
|
|
CERROR("%s: refresh file layout " DFID " error %d.\n",
|
|
ll_get_fsname(inode->i_sb, NULL, 0),
|
|
PFID(lu_object_fid(&obj->co_lu)), result);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static struct vvp_io *cl2vvp_io(const struct lu_env *env,
|
|
const struct cl_io_slice *slice)
|
|
{
|
|
/* Calling just for assertion */
|
|
cl2ccc_io(env, slice);
|
|
return vvp_env_io(env);
|
|
}
|