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* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.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 VVP layer.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
* Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
*/
#define DEBUG_SUBSYSTEM S_LLITE
#include "../include/obd.h"
#include "llite_internal.h"
#include "vvp_internal.h"
static struct vvp_io *cl2vvp_io(const struct lu_env *env,
const struct cl_io_slice *slice)
{
struct vvp_io *vio;
vio = container_of(slice, struct vvp_io, vui_cl);
LASSERT(vio == vvp_env_io(env));
return vio;
}
/**
* For swapping layout. The file's layout may have changed.
* To avoid populating pages to a wrong stripe, we have to verify the
* correctness of layout. It works because swapping layout processes
* have to acquire group lock.
*/
static bool can_populate_pages(const struct lu_env *env, struct cl_io *io,
struct inode *inode)
{
struct ll_inode_info *lli = ll_i2info(inode);
struct vvp_io *vio = vvp_env_io(env);
bool rc = true;
switch (io->ci_type) {
case CIT_READ:
case CIT_WRITE:
/* don't need lock here to check lli_layout_gen as we have held
* extent lock and GROUP lock has to hold to swap layout
*/
if (ll_layout_version_get(lli) != vio->vui_layout_gen ||
OBD_FAIL_CHECK_RESET(OBD_FAIL_LLITE_LOST_LAYOUT, 0)) {
io->ci_need_restart = 1;
/* this will cause a short read/write */
io->ci_continue = 0;
rc = false;
}
case CIT_FAULT:
/* fault is okay because we've already had a page. */
default:
break;
}
return rc;
}
static void vvp_object_size_lock(struct cl_object *obj)
{
struct inode *inode = vvp_object_inode(obj);
ll_inode_size_lock(inode);
cl_object_attr_lock(obj);
}
static void vvp_object_size_unlock(struct cl_object *obj)
{
struct inode *inode = vvp_object_inode(obj);
cl_object_attr_unlock(obj);
ll_inode_size_unlock(inode);
}
/**
* Helper function that if necessary adjusts file size (inode->i_size), when
* position at the offset \a pos is accessed. File size can be arbitrary stale
* on a Lustre client, but client at least knows KMS. If accessed area is
* inside [0, KMS], set file size to KMS, otherwise glimpse file size.
*
* Locking: cl_isize_lock is used to serialize changes to inode size and to
* protect consistency between inode size and cl_object
* attributes. cl_object_size_lock() protects consistency between cl_attr's of
* top-object and sub-objects.
*/
static int vvp_prep_size(const struct lu_env *env, struct cl_object *obj,
struct cl_io *io, loff_t start, size_t count,
int *exceed)
{
struct cl_attr *attr = vvp_env_thread_attr(env);
struct inode *inode = vvp_object_inode(obj);
loff_t pos = start + count - 1;
loff_t kms;
int result;
/*
* Consistency guarantees: following possibilities exist for the
* relation between region being accessed and real file size at this
* moment:
*
* (A): the region is completely inside of the file;
*
* (B-x): x bytes of region are inside of the file, the rest is
* outside;
*
* (C): the region is completely outside of the file.
*
* This classification is stable under DLM lock already acquired by
* the caller, because to change the class, other client has to take
* DLM lock conflicting with our lock. Also, any updates to ->i_size
* by other threads on this client are serialized by
* ll_inode_size_lock(). This guarantees that short reads are handled
* correctly in the face of concurrent writes and truncates.
*/
vvp_object_size_lock(obj);
result = cl_object_attr_get(env, obj, attr);
if (result == 0) {
kms = attr->cat_kms;
if (pos > kms) {
/*
* A glimpse is necessary to determine whether we
* return a short read (B) or some zeroes at the end
* of the buffer (C)
*/
vvp_object_size_unlock(obj);
result = cl_glimpse_lock(env, io, inode, obj, 0);
if (result == 0 && exceed) {
/* If objective page index exceed end-of-file
* page index, return directly. Do not expect
* kernel will check such case correctly.
* linux-2.6.18-128.1.1 miss to do that.
* --bug 17336
*/
loff_t size = i_size_read(inode);
loff_t cur_index = start >> PAGE_SHIFT;
loff_t size_index = (size - 1) >> PAGE_SHIFT;
if ((size == 0 && cur_index != 0) ||
size_index < cur_index)
*exceed = 1;
}
return result;
}
/*
* region is within kms and, hence, within real file
* size (A). We need to increase i_size to cover the
* read region so that generic_file_read() will do its
* job, but that doesn't mean the kms size is
* _correct_, it is only the _minimum_ size. If
* someone does a stat they will get the correct size
* which will always be >= the kms value here.
* b=11081
*/
if (i_size_read(inode) < kms) {
i_size_write(inode, kms);
CDEBUG(D_VFSTRACE, DFID " updating i_size %llu\n",
PFID(lu_object_fid(&obj->co_lu)),
(__u64)i_size_read(inode));
}
}
vvp_object_size_unlock(obj);
return result;
}
/*****************************************************************************
*
* io operations.
*
*/
static int vvp_io_one_lock_index(const struct lu_env *env, struct cl_io *io,
__u32 enqflags, enum cl_lock_mode mode,
pgoff_t start, pgoff_t end)
{
struct vvp_io *vio = vvp_env_io(env);
struct cl_lock_descr *descr = &vio->vui_link.cill_descr;
struct cl_object *obj = io->ci_obj;
CLOBINVRNT(env, obj, vvp_object_invariant(obj));
CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end);
memset(&vio->vui_link, 0, sizeof(vio->vui_link));
if (vio->vui_fd && (vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
descr->cld_mode = CLM_GROUP;
descr->cld_gid = vio->vui_fd->fd_grouplock.lg_gid;
enqflags |= CEF_LOCK_MATCH;
} else {
descr->cld_mode = mode;
}
descr->cld_obj = obj;
descr->cld_start = start;
descr->cld_end = end;
descr->cld_enq_flags = enqflags;
cl_io_lock_add(env, io, &vio->vui_link);
return 0;
}
static int vvp_io_one_lock(const struct lu_env *env, struct cl_io *io,
__u32 enqflags, enum cl_lock_mode mode,
loff_t start, loff_t end)
{
struct cl_object *obj = io->ci_obj;
return vvp_io_one_lock_index(env, io, enqflags, mode,
cl_index(obj, start), cl_index(obj, end));
}
static int vvp_io_write_iter_init(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct vvp_io *vio = cl2vvp_io(env, ios);
cl_page_list_init(&vio->u.write.vui_queue);
vio->u.write.vui_written = 0;
vio->u.write.vui_from = 0;
vio->u.write.vui_to = PAGE_SIZE;
return 0;
}
static void vvp_io_write_iter_fini(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct vvp_io *vio = cl2vvp_io(env, ios);
LASSERT(vio->u.write.vui_queue.pl_nr == 0);
}
static int vvp_io_fault_iter_init(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct vvp_io *vio = cl2vvp_io(env, ios);
struct inode *inode = vvp_object_inode(ios->cis_obj);
LASSERT(inode == file_inode(vio->vui_fd->fd_file));
vio->u.fault.ft_mtime = inode->i_mtime.tv_sec;
return 0;
}
static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
struct cl_object *obj = io->ci_obj;
struct vvp_io *vio = cl2vvp_io(env, ios);
struct inode *inode = vvp_object_inode(obj);
CLOBINVRNT(env, obj, vvp_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,
vio->vui_layout_gen, io->ci_restore_needed);
if (io->ci_restore_needed) {
int rc;
/* file was detected release, we need to restore it
* before finishing the io
*/
rc = ll_layout_restore(inode, 0, OBD_OBJECT_EOF);
/* if restore registration failed, no restart,
* we will return -ENODATA
*/
/* The layout will change after restore, so we need to
* block on layout lock hold by the MDT
* as MDT will not send new layout in lvb (see LU-3124)
* we have to explicitly fetch it, all this will be done
* by ll_layout_refresh()
*/
if (rc == 0) {
io->ci_restore_needed = 0;
io->ci_need_restart = 1;
io->ci_verify_layout = 1;
} else {
io->ci_restore_needed = 1;
io->ci_need_restart = 0;
io->ci_verify_layout = 0;
io->ci_result = rc;
}
}
if (!io->ci_ignore_layout && io->ci_verify_layout) {
__u32 gen = 0;
/* check layout version */
ll_layout_refresh(inode, &gen);
io->ci_need_restart = vio->vui_layout_gen != gen;
if (io->ci_need_restart) {
CDEBUG(D_VFSTRACE,
DFID" layout changed from %d to %d.\n",
PFID(lu_object_fid(&obj->co_lu)),
vio->vui_layout_gen, gen);
/* today successful restore is the only possible case */
/* restore was done, clear restoring state */
clear_bit(LLIF_FILE_RESTORING,
&ll_i2info(inode)->lli_flags);
}
}
}
static void vvp_io_fault_fini(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
struct cl_page *page = io->u.ci_fault.ft_page;
CLOBINVRNT(env, io->ci_obj, vvp_object_invariant(io->ci_obj));
if (page) {
lu_ref_del(&page->cp_reference, "fault", io);
cl_page_put(env, page);
io->u.ci_fault.ft_page = NULL;
}
vvp_io_fini(env, ios);
}
static enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma)
{
/*
* we only want to hold PW locks if the mmap() can generate
* writes back to the file and that only happens in shared
* writable vmas
*/
if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE))
return CLM_WRITE;
return CLM_READ;
}
static int vvp_mmap_locks(const struct lu_env *env,
struct vvp_io *vio, struct cl_io *io)
{
struct vvp_thread_info *cti = vvp_env_info(env);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct cl_lock_descr *descr = &cti->vti_descr;
union ldlm_policy_data policy;
unsigned long addr;
ssize_t count;
int result = 0;
struct iov_iter i;
struct iovec iov;
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
if (!vio->vui_iter) /* nfs or loop back device write */
return 0;
/* No MM (e.g. NFS)? No vmas too. */
if (!mm)
return 0;
iov_for_each(iov, i, *vio->vui_iter) {
addr = (unsigned long)iov.iov_base;
count = iov.iov_len;
if (count == 0)
continue;
count += addr & (~PAGE_MASK);
addr &= PAGE_MASK;
down_read(&mm->mmap_sem);
while ((vma = our_vma(mm, addr, count)) != NULL) {
struct inode *inode = file_inode(vma->vm_file);
int flags = CEF_MUST;
if (ll_file_nolock(vma->vm_file)) {
/*
* For no lock case is not allowed for mmap
*/
result = -EINVAL;
break;
}
/*
* XXX: Required lock mode can be weakened: CIT_WRITE
* io only ever reads user level buffer, and CIT_READ
* only writes on it.
*/
policy_from_vma(&policy, vma, addr, count);
descr->cld_mode = vvp_mode_from_vma(vma);
descr->cld_obj = ll_i2info(inode)->lli_clob;
descr->cld_start = cl_index(descr->cld_obj,
policy.l_extent.start);
descr->cld_end = cl_index(descr->cld_obj,
policy.l_extent.end);
descr->cld_enq_flags = flags;
result = cl_io_lock_alloc_add(env, io, descr);
CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n",
descr->cld_mode, descr->cld_start,
descr->cld_end);
if (result < 0)
break;
if (vma->vm_end - addr >= count)
break;
count -= vma->vm_end - addr;
addr = vma->vm_end;
}
up_read(&mm->mmap_sem);
if (result < 0)
break;
}
return result;
}
static void vvp_io_advance(const struct lu_env *env,
const struct cl_io_slice *ios,
size_t nob)
{
struct cl_object *obj = ios->cis_io->ci_obj;
struct vvp_io *vio = cl2vvp_io(env, ios);
CLOBINVRNT(env, obj, vvp_object_invariant(obj));
vio->vui_tot_count -= nob;
iov_iter_reexpand(vio->vui_iter, vio->vui_tot_count);
}
static void vvp_io_update_iov(const struct lu_env *env,
struct vvp_io *vio, struct cl_io *io)
{
size_t size = io->u.ci_rw.crw_count;
if (!vio->vui_iter)
return;
iov_iter_truncate(vio->vui_iter, size);
}
static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
enum cl_lock_mode mode, loff_t start, loff_t end)
{
struct vvp_io *vio = vvp_env_io(env);
int result;
int ast_flags = 0;
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
vvp_io_update_iov(env, vio, io);
if (io->u.ci_rw.crw_nonblock)
ast_flags |= CEF_NONBLOCK;
result = vvp_mmap_locks(env, vio, io);
if (result == 0)
result = vvp_io_one_lock(env, io, ast_flags, mode, start, end);
return result;
}
static int vvp_io_read_lock(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
struct cl_io_rw_common *rd = &io->u.ci_rd.rd;
int result;
result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos,
rd->crw_pos + rd->crw_count - 1);
return result;
}
static int vvp_io_fault_lock(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
struct vvp_io *vio = cl2vvp_io(env, ios);
/*
* XXX LDLM_FL_CBPENDING
*/
return vvp_io_one_lock_index(env,
io, 0,
vvp_mode_from_vma(vio->u.fault.ft_vma),
io->u.ci_fault.ft_index,
io->u.ci_fault.ft_index);
}
static int vvp_io_write_lock(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
loff_t start;
loff_t end;
if (io->u.ci_wr.wr_append) {
start = 0;
end = OBD_OBJECT_EOF;
} else {
start = io->u.ci_wr.wr.crw_pos;
end = start + io->u.ci_wr.wr.crw_count - 1;
}
return vvp_io_rw_lock(env, io, CLM_WRITE, start, end);
}
static int vvp_io_setattr_iter_init(const struct lu_env *env,
const struct cl_io_slice *ios)
{
return 0;
}
/**
* Implementation of cl_io_operations::vio_lock() method for CIT_SETATTR io.
*
* Handles "lockless io" mode when extent locking is done by server.
*/
static int vvp_io_setattr_lock(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
__u64 new_size;
__u32 enqflags = 0;
if (cl_io_is_trunc(io)) {
new_size = io->u.ci_setattr.sa_attr.lvb_size;
if (new_size == 0)
enqflags = CEF_DISCARD_DATA;
} else {
unsigned int valid = io->u.ci_setattr.sa_valid;
if (!(valid & TIMES_SET_FLAGS))
return 0;
if ((!(valid & ATTR_MTIME) ||
io->u.ci_setattr.sa_attr.lvb_mtime >=
io->u.ci_setattr.sa_attr.lvb_ctime) &&
(!(valid & ATTR_ATIME) ||
io->u.ci_setattr.sa_attr.lvb_atime >=
io->u.ci_setattr.sa_attr.lvb_ctime))
return 0;
new_size = 0;
}
return vvp_io_one_lock(env, io, enqflags, CLM_WRITE,
new_size, OBD_OBJECT_EOF);
}
static int vvp_do_vmtruncate(struct inode *inode, size_t size)
{
int result;
/*
* Only ll_inode_size_lock is taken at this level.
*/
ll_inode_size_lock(inode);
result = inode_newsize_ok(inode, size);
if (result < 0) {
ll_inode_size_unlock(inode);
return result;
}
truncate_setsize(inode, size);
ll_inode_size_unlock(inode);
return result;
}
static int vvp_io_setattr_time(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
struct cl_object *obj = io->ci_obj;
struct cl_attr *attr = vvp_env_thread_attr(env);
int result;
unsigned valid = CAT_CTIME;
cl_object_attr_lock(obj);
attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime;
if (io->u.ci_setattr.sa_valid & ATTR_ATIME_SET) {
attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
valid |= CAT_ATIME;
}
if (io->u.ci_setattr.sa_valid & ATTR_MTIME_SET) {
attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
valid |= CAT_MTIME;
}
result = cl_object_attr_update(env, obj, attr, valid);
cl_object_attr_unlock(obj);
return result;
}
static int vvp_io_setattr_start(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
struct inode *inode = vvp_object_inode(io->ci_obj);
struct ll_inode_info *lli = ll_i2info(inode);
if (cl_io_is_trunc(io)) {
down_write(&lli->lli_trunc_sem);
inode_lock(inode);
inode_dio_wait(inode);
} else {
inode_lock(inode);
}
if (io->u.ci_setattr.sa_valid & TIMES_SET_FLAGS)
return vvp_io_setattr_time(env, ios);
return 0;
}
static void vvp_io_setattr_end(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
struct inode *inode = vvp_object_inode(io->ci_obj);
struct ll_inode_info *lli = ll_i2info(inode);
if (cl_io_is_trunc(io)) {
/* Truncate in memory pages - they must be clean pages
* because osc has already notified to destroy osc_extents.
*/
vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
inode_unlock(inode);
up_write(&lli->lli_trunc_sem);
} else {
inode_unlock(inode);
}
}
static void vvp_io_setattr_fini(const struct lu_env *env,
const struct cl_io_slice *ios)
{
bool restore_needed = ios->cis_io->ci_restore_needed;
struct inode *inode = vvp_object_inode(ios->cis_obj);
vvp_io_fini(env, ios);
if (restore_needed && !ios->cis_io->ci_restore_needed) {
/* restore finished, set data modified flag for HSM */
set_bit(LLIF_DATA_MODIFIED, &(ll_i2info(inode))->lli_flags);
}
}
static int vvp_io_read_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 = vvp_object_inode(obj);
struct ll_inode_info *lli = ll_i2info(inode);
struct file *file = vio->vui_fd->fd_file;
int result;
loff_t pos = io->u.ci_rd.rd.crw_pos;
long cnt = io->u.ci_rd.rd.crw_count;
long tot = vio->vui_tot_count;
int exceed = 0;
CLOBINVRNT(env, obj, vvp_object_invariant(obj));
CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt);
down_read(&lli->lli_trunc_sem);
if (!can_populate_pages(env, io, inode))
return 0;
result = vvp_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 */
vio->vui_fd->fd_file->f_ra.ra_pages = 0;
/* initialize read-ahead window once per syscall */
if (!vio->vui_ra_valid) {
vio->vui_ra_valid = true;
vio->vui_ra_start = cl_index(obj, pos);
vio->vui_ra_count = cl_index(obj, tot + PAGE_SIZE - 1);
ll_ras_enter(file);
}
/* BUG: 5972 */
file_accessed(file);
LASSERT(vio->vui_iocb->ki_pos == pos);
result = generic_file_read_iter(vio->vui_iocb, vio->vui_iter);
out:
if (result >= 0) {
if (result < cnt)
io->ci_continue = 0;
io->ci_nob += result;
ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
vio->vui_fd, pos, result, READ);
result = 0;
}
return result;
}
static int vvp_io_commit_sync(const struct lu_env *env, struct cl_io *io,
struct cl_page_list *plist, int from, int to)
{
struct cl_2queue *queue = &io->ci_queue;
struct cl_page *page;
unsigned int bytes = 0;
int rc = 0;
if (plist->pl_nr == 0)
return 0;
if (from > 0 || to != PAGE_SIZE) {
page = cl_page_list_first(plist);
if (plist->pl_nr == 1) {
cl_page_clip(env, page, from, to);
} else {
if (from > 0)
cl_page_clip(env, page, from, PAGE_SIZE);
if (to != PAGE_SIZE) {
page = cl_page_list_last(plist);
cl_page_clip(env, page, 0, to);
}
}
}
cl_2queue_init(queue);
cl_page_list_splice(plist, &queue->c2_qin);
rc = cl_io_submit_sync(env, io, CRT_WRITE, queue, 0);
/* plist is not sorted any more */
cl_page_list_splice(&queue->c2_qin, plist);
cl_page_list_splice(&queue->c2_qout, plist);
cl_2queue_fini(env, queue);
if (rc == 0) {
/* calculate bytes */
bytes = plist->pl_nr << PAGE_SHIFT;
bytes -= from + PAGE_SIZE - to;
while (plist->pl_nr > 0) {
page = cl_page_list_first(plist);
cl_page_list_del(env, plist, page);
cl_page_clip(env, page, 0, PAGE_SIZE);
SetPageUptodate(cl_page_vmpage(page));
cl_page_disown(env, io, page);
/* held in ll_cl_init() */
lu_ref_del(&page->cp_reference, "cl_io", io);
cl_page_put(env, page);
}
}
return bytes > 0 ? bytes : rc;
}
static void write_commit_callback(const struct lu_env *env, struct cl_io *io,
struct cl_page *page)
{
struct page *vmpage = page->cp_vmpage;
SetPageUptodate(vmpage);
set_page_dirty(vmpage);
cl_page_disown(env, io, page);
/* held in ll_cl_init() */
lu_ref_del(&page->cp_reference, "cl_io", cl_io_top(io));
cl_page_put(env, page);
}
/* make sure the page list is contiguous */
static bool page_list_sanity_check(struct cl_object *obj,
struct cl_page_list *plist)
{
struct cl_page *page;
pgoff_t index = CL_PAGE_EOF;
cl_page_list_for_each(page, plist) {
struct vvp_page *vpg = cl_object_page_slice(obj, page);
if (index == CL_PAGE_EOF) {
index = vvp_index(vpg);
continue;
}
++index;
if (index == vvp_index(vpg))
continue;
return false;
}
return true;
}
/* Return how many bytes have queued or written */
int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io)
{
struct cl_object *obj = io->ci_obj;
struct inode *inode = vvp_object_inode(obj);
struct vvp_io *vio = vvp_env_io(env);
struct cl_page_list *queue = &vio->u.write.vui_queue;
struct cl_page *page;
int rc = 0;
int bytes = 0;
unsigned int npages = vio->u.write.vui_queue.pl_nr;
if (npages == 0)
return 0;
CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d\n",
npages, vio->u.write.vui_from, vio->u.write.vui_to);
LASSERT(page_list_sanity_check(obj, queue));
/* submit IO with async write */
rc = cl_io_commit_async(env, io, queue,
vio->u.write.vui_from, vio->u.write.vui_to,
write_commit_callback);
npages -= queue->pl_nr; /* already committed pages */
if (npages > 0) {
/* calculate how many bytes were written */
bytes = npages << PAGE_SHIFT;
/* first page */
bytes -= vio->u.write.vui_from;
if (queue->pl_nr == 0) /* last page */
bytes -= PAGE_SIZE - vio->u.write.vui_to;
LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages);
vio->u.write.vui_written += bytes;
CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n",
npages, bytes, vio->u.write.vui_written);
/* the first page must have been written. */
vio->u.write.vui_from = 0;
}
LASSERT(page_list_sanity_check(obj, queue));
LASSERT(ergo(rc == 0, queue->pl_nr == 0));
/* out of quota, try sync write */
if (rc == -EDQUOT && !cl_io_is_mkwrite(io)) {
rc = vvp_io_commit_sync(env, io, queue,
vio->u.write.vui_from,
vio->u.write.vui_to);
if (rc > 0) {
vio->u.write.vui_written += rc;
rc = 0;
}
}
/* update inode size */
ll_merge_attr(env, inode);
/* Now the pages in queue were failed to commit, discard them
* unless they were dirtied before.
*/
while (queue->pl_nr > 0) {
page = cl_page_list_first(queue);
cl_page_list_del(env, queue, page);
if (!PageDirty(cl_page_vmpage(page)))
cl_page_discard(env, io, page);
cl_page_disown(env, io, page);
/* held in ll_cl_init() */
lu_ref_del(&page->cp_reference, "cl_io", io);
cl_page_put(env, page);
}
cl_page_list_fini(env, queue);
return rc;
}
static int vvp_io_write_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 = vvp_object_inode(obj);
struct ll_inode_info *lli = ll_i2info(inode);
ssize_t result = 0;
loff_t pos = io->u.ci_wr.wr.crw_pos;
size_t cnt = io->u.ci_wr.wr.crw_count;
down_read(&lli->lli_trunc_sem);
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.
*/
ll_merge_attr(env, inode);
pos = i_size_read(inode);
io->u.ci_wr.wr.crw_pos = pos;
vio->vui_iocb->ki_pos = pos;
} else {
LASSERT(vio->vui_iocb->ki_pos == pos);
}
CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
/*
* The maximum Lustre file size is variable, based on the OST maximum
* object size and number of stripes. This needs another check in
* addition to the VFS checks earlier.
*/
if (pos + cnt > ll_file_maxbytes(inode)) {
CDEBUG(D_INODE,
"%s: file " DFID " offset %llu > maxbytes %llu\n",
ll_get_fsname(inode->i_sb, NULL, 0),
PFID(ll_inode2fid(inode)), pos + cnt,
ll_file_maxbytes(inode));
return -EFBIG;
}
if (!vio->vui_iter) {
/* from a temp io in ll_cl_init(). */
result = 0;
} else {
/*
* When using the locked AIO function (generic_file_aio_write())
* testing has shown the inode mutex to be a limiting factor
* with multi-threaded single shared file performance. To get
* around this, we now use the lockless version. To maintain
* consistency, proper locking to protect against writes,
* trucates, etc. is handled in the higher layers of lustre.
*/
bool lock_node = !IS_NOSEC(inode);
if (lock_node)
inode_lock(inode);
result = __generic_file_write_iter(vio->vui_iocb,
vio->vui_iter);
if (lock_node)
inode_unlock(inode);
if (result > 0 || result == -EIOCBQUEUED)
result = generic_write_sync(vio->vui_iocb, result);
}
if (result > 0) {
result = vvp_io_write_commit(env, io);
if (vio->u.write.vui_written > 0) {
result = vio->u.write.vui_written;
io->ci_nob += result;
CDEBUG(D_VFSTRACE, "write: nob %zd, result: %zd\n",
io->ci_nob, result);
}
}
if (result > 0) {
set_bit(LLIF_DATA_MODIFIED, &(ll_i2info(inode))->lli_flags);
if (result < cnt)
io->ci_continue = 0;
ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
vio->vui_fd, pos, result, WRITE);
result = 0;
}
return result;
}
static void vvp_io_rw_end(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct inode *inode = vvp_object_inode(ios->cis_obj);
struct ll_inode_info *lli = ll_i2info(inode);
up_read(&lli->lli_trunc_sem);
}
static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
{
struct vm_fault *vmf = cfio->ft_vmf;
cfio->ft_flags = filemap_fault(vmf);
cfio->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), (void *)vmf->address);
if (unlikely(!(cfio->ft_flags & VM_FAULT_LOCKED))) {
lock_page(vmf->page);
cfio->ft_flags |= VM_FAULT_LOCKED;
}
cfio->ft_vmpage = vmf->page;
return 0;
}
if (cfio->ft_flags & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", (void *)vmf->address);
return -EFAULT;
}
if (cfio->ft_flags & VM_FAULT_OOM) {
CDEBUG(D_PAGE, "got addr %p - OOM\n", (void *)vmf->address);
return -ENOMEM;
}
if (cfio->ft_flags & VM_FAULT_RETRY)
return -EAGAIN;
CERROR("Unknown error in page fault %d!\n", cfio->ft_flags);
return -EINVAL;
}
static void mkwrite_commit_callback(const struct lu_env *env, struct cl_io *io,
struct cl_page *page)
{
set_page_dirty(page->cp_vmpage);
}
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 = vvp_object_inode(obj);
struct ll_inode_info *lli = ll_i2info(inode);
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_index;
down_read(&lli->lli_trunc_sem);
/* 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 = vvp_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;
}
last_index = cl_index(obj, size - 1);
if (fio->ft_mkwrite) {
/*
* 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.
*/
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 (!PageDirty(vmpage)) {
struct cl_page_list *plist = &io->ci_queue.c2_qin;
struct vvp_page *vpg = cl_object_page_slice(obj, page);
int to = PAGE_SIZE;
/* vvp_page_assume() calls wait_on_page_writeback(). */
cl_page_assume(env, io, page);
cl_page_list_init(plist);
cl_page_list_add(plist, page);
/* size fixup */
if (last_index == vvp_index(vpg))
to = size & ~PAGE_MASK;
/* 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_io_commit_async(env, io, plist, 0, to,
mkwrite_commit_callback);
LASSERT(cl_page_is_owned(page, io));
cl_page_list_fini(env, plist);
vmpage = NULL;
if (result < 0) {
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);
}
}
}
/*
* 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_index);
if (fio->ft_index == last_index)
/*
* 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->ft_flags &= ~VM_FAULT_LOCKED;
return result;
}
static void vvp_io_fault_end(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct inode *inode = vvp_object_inode(ios->cis_obj);
struct ll_inode_info *lli = ll_i2info(inode);
CLOBINVRNT(env, ios->cis_io->ci_obj,
vvp_object_invariant(ios->cis_io->ci_obj));
up_read(&lli->lli_trunc_sem);
}
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_ahead(const struct lu_env *env,
const struct cl_io_slice *ios,
pgoff_t start, struct cl_read_ahead *ra)
{
int result = 0;
if (ios->cis_io->ci_type == CIT_READ ||
ios->cis_io->ci_type == CIT_FAULT) {
struct vvp_io *vio = cl2vvp_io(env, ios);
if (unlikely(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
ra->cra_end = CL_PAGE_EOF;
result = 1; /* no need to call down */
}
}
return result;
}
static const struct cl_io_operations vvp_io_ops = {
.op = {
[CIT_READ] = {
.cio_fini = vvp_io_fini,
.cio_lock = vvp_io_read_lock,
.cio_start = vvp_io_read_start,
.cio_end = vvp_io_rw_end,
.cio_advance = vvp_io_advance,
},
[CIT_WRITE] = {
.cio_fini = vvp_io_fini,
.cio_iter_init = vvp_io_write_iter_init,
.cio_iter_fini = vvp_io_write_iter_fini,
.cio_lock = vvp_io_write_lock,
.cio_start = vvp_io_write_start,
.cio_end = vvp_io_rw_end,
.cio_advance = vvp_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 = vvp_io_fault_end,
},
[CIT_FSYNC] = {
.cio_start = vvp_io_fsync_start,
.cio_fini = vvp_io_fini
},
[CIT_MISC] = {
.cio_fini = vvp_io_fini
}
},
.cio_read_ahead = vvp_io_read_ahead,
};
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 inode *inode = vvp_object_inode(obj);
int result;
CLOBINVRNT(env, obj, vvp_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,
vio->vui_layout_gen, io->ci_restore_needed);
CL_IO_SLICE_CLEAN(vio, vui_cl);
cl_io_slice_add(io, &vio->vui_cl, obj, &vvp_io_ops);
vio->vui_ra_valid = false;
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
vio->vui_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;
}
/* 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, &vio->vui_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;
}
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