Viewing: vvp_io.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* 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 <obd.h>
#include <linux/pagevec.h>
#include <lustre_compat/linux/mm.h>
#include <linux/memcontrol.h>
#include <linux/falloc.h>
#include "llite_internal.h"
#include "vvp_internal.h"
#include <lustre_compat.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 ||
CFS_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;
}
fallthrough;
case CIT_FAULT:
/* fault is okay because we've already had a page. */
fallthrough;
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: i_size_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 bytes,
int *exceed)
{
struct cl_attr *attr = vvp_env_new_attr(env);
struct inode *inode = vvp_object_inode(obj);
loff_t pos = start + bytes - 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;
/*
* For parity I/O, use ci_parity_eof instead of kms to
* determine if we're past EOF.
*/
if (io->ci_parity_io && exceed != NULL) {
loff_t parity_eof = io->ci_parity_eof;
unsigned long cur_index = start >> PAGE_SHIFT;
if ((parity_eof == 0 && cur_index != 0) ||
(((parity_eof - 1) >> PAGE_SHIFT) < cur_index)) {
*exceed = 1;
vvp_object_size_unlock(obj);
return 0;
}
}
if (pos > kms || !attr->cat_kms_valid) {
/*
* 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 != NULL) {
/* If objective page index exceed end-of-file
* page index, return directly. Do not expect
* kernel will check such case correctly.
* For parity I/O, use ci_parity_eof which is
* calculated from RAID geometry in the LOV
* layer.
*/
loff_t size = io->ci_parity_io ?
io->ci_parity_eof : i_size_read(inode);
unsigned long cur_index = start >> PAGE_SHIFT;
if ((size == 0 && cur_index != 0) ||
(((size - 1) >> PAGE_SHIFT) < cur_index))
*exceed = 1;
}
return result;
}
/*
* region is within kms and, hence, within real file
* size (A). We need to fix 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 read outside of kms - glimpse needed.
* size might to be wrong due lock cancelation in middle.
* b=11081
*/
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));
ENTRY;
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->lfd_file_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)
{
return vvp_io_one_lock_index(env, io, enqflags, mode,
start >> PAGE_SHIFT, end >> PAGE_SHIFT);
}
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.readwrite.vui_queue);
vio->u.readwrite.vui_written = 0;
vio->u.readwrite.vui_from = 0;
vio->u.readwrite.vui_to = PAGE_SIZE;
return 0;
}
static int vvp_io_read_iter_init(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct vvp_io *vio = cl2vvp_io(env, ios);
vio->u.readwrite.vui_read = 0;
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.readwrite.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));
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);
__u32 gen = 0;
int rc;
ENTRY;
CLOBINVRNT(env, obj, vvp_object_invariant(obj));
CDEBUG(D_VFSTRACE, DFID" ignore/verify layout %d/%d, layout version %d need write layout %d, restore needed %d, invalidate_lock %d\n",
PFID(lu_object_fid(&obj->co_lu)),
io->ci_ignore_layout, io->ci_verify_layout,
vio->vui_layout_gen, io->ci_need_write_intent,
io->ci_restore_needed, io->ci_invalidate_page_cache);
#ifdef HAVE_INVALIDATE_LOCK
if (io->ci_invalidate_page_cache) {
filemap_invalidate_unlock(inode->i_mapping);
io->ci_invalidate_page_cache = 0;
}
#endif /* HAVE_INVALIDATE_LOCK */
if (io->ci_restore_needed) {
/* 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 held 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().
* Even if ll_layout_restore() returns zero, it doesn't mean
* that restore has been successful. Therefore it sets
* ci_verify_layout so that it will check layout at the end
* of this function.
*/
if (rc) {
io->ci_restore_needed = 1;
io->ci_need_restart = 0;
io->ci_verify_layout = 0;
io->ci_result = rc;
GOTO(out, rc);
}
io->ci_restore_needed = 0;
/* Even if ll_layout_restore() returns zero, it doesn't mean
* that restore has been successful. Therefore it should verify
* if there was layout change and restart I/O correspondingly.
*/
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(vvp_object_inode(obj))->lli_flags);
}
GOTO(out, 0);
}
/* dynamic layout change needed, send layout intent RPC. */
if (io->ci_need_write_intent || io->ci_need_pccro_clear) {
enum layout_intent_opc opc = LAYOUT_INTENT_WRITE;
io->ci_need_write_intent = 0;
LASSERT(io->ci_type == CIT_WRITE || cl_io_is_fallocate(io) ||
cl_io_is_trunc(io) || cl_io_is_mkwrite(io));
CDEBUG(D_VFSTRACE, DFID" write layout, type %u "DEXT"\n",
PFID(lu_object_fid(&obj->co_lu)), io->ci_type,
PEXT(&io->ci_write_intent));
if (cl_io_is_trunc(io))
opc = LAYOUT_INTENT_TRUNC;
if (io->ci_need_pccro_clear) {
io->ci_need_pccro_clear = 0;
opc = LAYOUT_INTENT_PCCRO_CLEAR;
}
rc = ll_layout_write_intent(inode, opc, &io->ci_write_intent);
io->ci_result = rc;
if (!rc)
io->ci_need_restart = 1;
GOTO(out, rc);
}
if (!io->ci_need_restart &&
!io->ci_ignore_layout && io->ci_verify_layout) {
/* 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);
}
GOTO(out, 0);
}
out:
EXIT;
}
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 != NULL) {
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 *vti = vvp_env_info(env);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct cl_lock_descr *descr = &vti->vti_descr;
union ldlm_policy_data policy;
struct iovec iov;
struct iov_iter i;
unsigned long addr;
ssize_t bytes;
int result = 0;
ENTRY;
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
/* nfs or loop back device write */
if (vio->vui_iter == NULL)
RETURN(0);
/* No MM (e.g. NFS)? No vmas too. */
if (mm == NULL)
RETURN(0);
if (!iter_is_iovec(vio->vui_iter) && !iov_iter_is_kvec(vio->vui_iter))
RETURN(0);
for (i = *vio->vui_iter;
iov_iter_count(&i);
iov_iter_advance(&i, iov.iov_len)) {
iov = iov_iter_iovec(&i);
addr = (unsigned long)iov.iov_base;
bytes = iov.iov_len;
if (bytes == 0)
continue;
bytes += addr & ~PAGE_MASK;
addr &= PAGE_MASK;
mmap_read_lock(mm);
while ((vma = our_vma(mm, addr, bytes)) != NULL) {
struct file *file = pcc_vma_file(vma);
struct dentry *de = file_dentry(file);
struct inode *inode = de->d_inode;
int flags = CEF_MUST;
if (ll_file_nolock(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, bytes);
descr->cld_mode = vvp_mode_from_vma(vma);
descr->cld_obj = ll_i2info(inode)->lli_clob;
descr->cld_start = policy.l_extent.start >> PAGE_SHIFT;
descr->cld_end = policy.l_extent.end >> PAGE_SHIFT;
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 >= bytes)
break;
bytes -= vma->vm_end - addr;
addr = vma->vm_end;
}
mmap_read_unlock(mm);
if (result < 0)
break;
}
RETURN(result);
}
static void vvp_io_advance(const struct lu_env *env,
const struct cl_io_slice *ios, size_t bytes)
{
struct cl_object *obj = ios->cis_io->ci_obj;
struct vvp_io *vio = cl2vvp_io(env, ios);
CLOBINVRNT(env, obj, vvp_object_invariant(obj));
/*
* Since 3.16(26978b8b4) vfs revert iov iter to
* original position even io succeed, so instead
* of relying on VFS, we move iov iter by ourselves.
*/
iov_iter_advance(vio->vui_iter, bytes);
CDEBUG(D_VFSTRACE, "advancing %ld bytes\n", bytes);
vio->vui_tot_bytes -= bytes;
iov_iter_reexpand(vio->vui_iter, vio->vui_tot_bytes);
}
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_bytes;
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;
ENTRY;
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;
if (io->ci_lock_no_expand)
ast_flags |= CEF_LOCK_NO_EXPAND;
if (vio->vui_fd) {
/* Group lock held means no lockless any more */
if (vio->vui_fd->lfd_file_flags & LL_FILE_GROUP_LOCKED)
io->ci_dio_lock = 1;
if (ll_file_nolock(vio->vui_fd->fd_file) ||
(iocb_ki_flags_check(vio->vui_iocb, IOCB_DIRECT) &&
!io->ci_dio_lock))
ast_flags |= CEF_NEVER;
}
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;
ENTRY;
result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos,
rd->crw_pos + rd->crw_bytes - 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) {
LASSERT(io->u.ci_wr.wr_append_lockpos >=
io->u.ci_wr.wr.crw_pos + io->u.ci_wr.wr.crw_bytes);
start = 0;
end = io->u.ci_wr.wr_append_lockpos;
} else {
start = io->u.ci_wr.wr.crw_pos;
end = start + io->u.ci_wr.wr.crw_bytes - 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::cio_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 lock_start = 0;
__u64 lock_end = OBD_OBJECT_EOF;
__u32 enqflags = 0;
if (cl_io_is_trunc(io)) {
struct inode *inode = vvp_object_inode(io->ci_obj);
/* set enqueue flags to CEF_MUST in case of encrypted file,
* to prevent lockless truncate
*/
if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
enqflags = CEF_MUST;
else if (io->u.ci_setattr.sa_attr.lvb_size == 0)
enqflags = CEF_DISCARD_DATA;
} else if (cl_io_is_fallocate(io)) {
lock_start = io->u.ci_setattr.sa_falloc_offset;
lock_end = io->u.ci_setattr.sa_falloc_end - 1;
} else {
unsigned int valid = io->u.ci_setattr.sa_avalid;
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;
}
return vvp_io_one_lock(env, io, enqflags, CLM_WRITE,
lock_start, lock_end);
}
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;
}
i_size_write(inode, size);
truncate_pagecache(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_new_attr(env);
int result;
enum cl_attr_valid 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_avalid & ATTR_ATIME_SET) {
attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
valid |= CAT_ATIME;
}
if (io->u.ci_setattr.sa_avalid & 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);
int mode = io->u.ci_setattr.sa_falloc_mode;
if (cl_io_is_trunc(io)) {
trunc_sem_down_write(&lli->lli_trunc_sem);
mutex_lock(&lli->lli_setattr_mutex);
inode_dio_wait(inode);
} else if (cl_io_is_fallocate(io)) {
loff_t size;
trunc_sem_down_write(&lli->lli_trunc_sem);
mutex_lock(&lli->lli_setattr_mutex);
inode_dio_wait(inode);
ll_merge_attr(env, inode);
size = i_size_read(inode);
if (io->u.ci_setattr.sa_falloc_end > size &&
!(mode & FALLOC_FL_KEEP_SIZE)) {
size = io->u.ci_setattr.sa_falloc_end;
io->u.ci_setattr.sa_avalid |= ATTR_SIZE;
}
io->u.ci_setattr.sa_attr.lvb_size = size;
} else {
mutex_lock(&lli->lli_setattr_mutex);
}
if (io->u.ci_setattr.sa_avalid & 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);
loff_t size = io->u.ci_setattr.sa_attr.lvb_size;
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, size);
mutex_unlock(&lli->lli_setattr_mutex);
trunc_sem_up_write(&lli->lli_trunc_sem);
/* Update size and blocks for LSOM */
if (!io->ci_ignore_layout)
ll_merge_attr(env, inode);
} else if (cl_io_is_fallocate(io)) {
int mode = io->u.ci_setattr.sa_falloc_mode;
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
size > i_size_read(inode)) {
ll_inode_size_lock(inode);
i_size_write(inode, size);
ll_inode_size_unlock(inode);
}
inode_set_ctime_current(inode);
mutex_unlock(&lli->lli_setattr_mutex);
trunc_sem_up_write(&lli->lli_trunc_sem);
} else {
mutex_unlock(&lli->lli_setattr_mutex);
}
}
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;
loff_t pos = io->u.ci_rd.rd.crw_pos;
size_t crw_bytes = io->u.ci_rd.rd.crw_bytes;
size_t tot_bytes = vio->vui_tot_bytes;
struct ll_cl_context *lcc;
unsigned int seq;
int exceed = 0;
int result;
int total_bytes_read = 0;
struct iov_iter iter;
pgoff_t page_offset;
ENTRY;
CLOBINVRNT(env, obj, vvp_object_invariant(obj));
CDEBUG(D_VFSTRACE, DNAME": read [%llu, %llu)\n",
encode_fn_file(file), pos, pos + crw_bytes);
trunc_sem_down_read(&lli->lli_trunc_sem);
if (io->ci_async_readahead) {
file_accessed(file);
RETURN(0);
}
if (!can_populate_pages(env, io, inode))
RETURN(0);
if (!iocb_ki_flags_check(vio->vui_iocb, IOCB_DIRECT)) {
result = cl_io_lru_reserve(env, io, pos, crw_bytes);
if (result)
RETURN(result);
}
/* Unless this is reading a sparse file, otherwise the lock has already
* been acquired so vvp_prep_size() is an empty op.
*/
result = vvp_prep_size(env, obj, io, pos, crw_bytes, &exceed);
if (result != 0)
RETURN(result);
else if (exceed != 0)
GOTO(out, result);
LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
"Read ino %lu, %zu bytes, offset %lld, size %llu\n",
inode->i_ino, crw_bytes, pos, i_size_read(inode));
/* initialize read-ahead window once per syscall */
if (!vio->vui_ra_valid) {
vio->vui_ra_valid = true;
vio->vui_ra_start_idx = pos >> PAGE_SHIFT;
vio->vui_ra_pages = 0;
page_offset = pos & ~PAGE_MASK;
if (page_offset) {
vio->vui_ra_pages++;
if (tot_bytes > PAGE_SIZE - page_offset)
tot_bytes -= (PAGE_SIZE - page_offset);
else
tot_bytes = 0;
}
vio->vui_ra_pages += (tot_bytes + PAGE_SIZE - 1) >> PAGE_SHIFT;
CDEBUG(D_READA, "tot %zu, ra_start %lu, ra_count %lu\n",
vio->vui_tot_bytes, vio->vui_ra_start_idx,
vio->vui_ra_pages);
}
/* BUG: 5972 */
file_accessed(file);
LASSERT(vio->vui_iocb->ki_pos == pos);
iter = *vio->vui_iter;
lcc = ll_cl_find(inode);
lcc->lcc_end_index = DIV_ROUND_UP(pos + iter.count, PAGE_SIZE);
CDEBUG(D_VFSTRACE, "count:%ld iocb pos:%lld\n", iter.count, pos);
/* this seqlock lets us notice if a page has been deleted on this inode
* during the fault process, allowing us to catch an erroneous short
* read or EIO. See LU-16160
*/
do {
seq = read_seqbegin(&ll_i2info(inode)->lli_page_inv_lock);
result = generic_file_read_iter(vio->vui_iocb, &iter);
if (result >= 0) {
io->ci_bytes += result;
total_bytes_read += result;
}
/* got a short read or -EIO and we raced with page invalidation retry */
} while (read_seqretry(&ll_i2info(inode)->lli_page_inv_lock, seq) &&
((result >= 0 && iov_iter_count(&iter) > 0)
|| result == -EIO));
out:
if (result >= 0) {
if (total_bytes_read < crw_bytes)
io->ci_continue = 0;
result = 0;
} else if (result == -EIOCBQUEUED) {
io->ci_bytes += vio->u.readwrite.vui_read;
vio->vui_iocb->ki_pos = pos + vio->u.readwrite.vui_read;
}
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;
ENTRY;
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, true);
cl_page_clip(env, page, 0, PAGE_SIZE);
SetPageUptodate(cl_page_vmpage(page));
cl_page_disown(env, io, page);
/* held in ll_cl_init() */
cl_page_put(env, page);
}
}
RETURN(bytes > 0 ? bytes : rc);
}
/* Taken from kernel set_page_dirty, __set_page_dirty_nobuffers
* Last change to this area: b93b016313b3ba8003c3b8bb71f569af91f19fc7
*
* Current with Linus tip of tree (7/13/2019):
* v5.2-rc4-224-ge01e060fe0
*
* Backwards compat for 3.x, 5.x kernels relating to memcg handling
* & rename of radix tree to xarray.
*/
static void vvp_set_batch_dirty(struct folio_batch *fbatch)
{
struct page *page = fbatch_at_pg(fbatch, 0, 0);
int count = folio_batch_count(fbatch);
#ifdef HAVE_ACCOUNT_PAGE_DIRTIED
struct address_space *mapping = page->mapping;
unsigned long flags;
unsigned long skip_pages = 0;
int pgno, pg, npgs;
int dirtied = 0;
#elif !defined(HAVE_FOLIO_BATCH) || !defined(HAVE_FILEMAP_GET_FOLIOS)
int pg, npgs;
#endif
int i;
ENTRY;
BUILD_BUG_ON(PAGEVEC_SIZE > BITS_PER_LONG);
LASSERTF(page->mapping,
"mapping must be set. page %px, page->private (cl_page) %px\n",
page, (void *) page->private);
/*
* kernels without HAVE_KALLSYMS_LOOKUP_NAME also don't have
* account_dirty_page exported, and if we can't access that symbol,
* we can't do page dirtying in batch (taking the xarray lock only once)
* so we just fall back to a looped call to __set_page_dirty_nobuffers
*/
#ifndef HAVE_ACCOUNT_PAGE_DIRTIED
for (i = 0; i < count; i++) {
#if defined(HAVE_FOLIO_BATCH) && defined(HAVE_FILEMAP_GET_FOLIOS)
filemap_dirty_folio(page->mapping, fbatch->folios[i]);
#else
npgs = fbatch_at_npgs(fbatch, i);
for (pg = 0; pg < npgs; pg++) {
page = fbatch_at_pg(fbatch, i, pg);
__set_page_dirty_nobuffers(page);
}
#endif
}
EXIT;
#else
/* account_page_dirtied is available directly or via kallsyms */
for (pgno = i = 0; i < count; i++) {
npgs = fbatch_at_npgs(fbatch, i);
for (pg = 0; pg < npgs; pg++) {
page = fbatch_at_pg(fbatch, i, pg);
ClearPageReclaim(page);
folio_memcg_lock_page(page);
if (TestSetPageDirty(page)) {
/* page is already dirty .. no extra work needed
* set a flag for the i'th page to be skipped
*/
folio_memcg_unlock_page(page);
skip_pages |= (1ul << pgno++);
LASSERTF(pgno <= BITS_PER_LONG,
"Limit exceeded pgno: %d/%d\n", pgno,
BITS_PER_LONG);
}
}
}
xa_lock_irqsave(&mapping->i_pages, flags);
/* Notes on differences with __set_page_dirty_nobuffers:
* 1. We don't need to call page_mapping because we know this is a page
* cache page.
* 2. We have the pages locked, so there is no need for the careful
* mapping/mapping2 dance.
* 3. No mapping is impossible. (Race w/truncate mentioned in
* dirty_nobuffers should be impossible because we hold the page lock.)
* 4. All mappings are the same because i/o is only to one file.
*/
for (pgno = i = 0; i < count; i++) {
npgs = fbatch_at_npgs(fbatch, i);
for (pg = 0; pg < npgs; pg++) {
page = fbatch_at_pg(fbatch, i, pg);
/* if the i'th page was unlocked above, skip it here */
if ((skip_pages >> pgno++) & 1)
continue;
LASSERTF(page->mapping == mapping,
"all pages must have the same mapping. page %px, mapping %px, first mapping %px\n",
page, page->mapping, mapping);
WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
compat_account_page_dirtied(page, mapping);
__xa_set_mark(&mapping->i_pages, folio_index_page(page),
PAGECACHE_TAG_DIRTY);
dirtied++;
folio_memcg_unlock_page(page);
}
}
xa_unlock_irqrestore(&mapping->i_pages, flags);
CDEBUG(D_VFSTRACE, "mapping %p, count %d, dirtied %d\n", mapping,
count, dirtied);
if (mapping->host && dirtied) {
/* !PageAnon && !swapper_space */
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
}
#endif
EXIT;
}
static void write_commit_callback(const struct lu_env *env, struct cl_io *io,
struct folio_batch *fbatch)
{
struct page *vmpage;
struct cl_page *page;
int pg, npgs;
int count = 0;
int i = 0;
ENTRY;
count = folio_batch_count(fbatch);
LASSERT(count > 0);
for (i = 0; i < count; i++) {
npgs = fbatch_at_npgs(fbatch, i);
for (pg = 0; pg < npgs; pg++)
SetPageUptodate(fbatch_at_pg(fbatch, i, pg));
}
vvp_set_batch_dirty(fbatch);
for (i = 0; i < count; i++) {
npgs = fbatch_at_npgs(fbatch, i);
for (pg = 0; pg < npgs; pg++) {
vmpage = fbatch_at_pg(fbatch, i, pg);
page = (struct cl_page *) vmpage->private;
cl_page_disown(env, io, page);
cl_page_put(env, page);
}
}
EXIT;
}
/* 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) {
if (index == CL_PAGE_EOF) {
index = cl_page_index(page);
continue;
}
++index;
if (index == cl_page_index(page))
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,
enum cl_io_priority prio)
{
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.readwrite.vui_queue;
struct cl_page *page;
int rc = 0;
int bytes = 0;
unsigned int npages = vio->u.readwrite.vui_queue.pl_nr;
ENTRY;
if (npages == 0)
RETURN(0);
CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d prio %d\n",
npages, vio->u.readwrite.vui_from, vio->u.readwrite.vui_to,
prio);
LASSERT(page_list_sanity_check(obj, queue));
/* submit IO with async write */
rc = cl_io_commit_async(env, io, queue,
vio->u.readwrite.vui_from,
vio->u.readwrite.vui_to,
write_commit_callback, prio);
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.readwrite.vui_from;
if (queue->pl_nr == 0) /* last page */
bytes -= PAGE_SIZE - vio->u.readwrite.vui_to;
LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages);
vio->u.readwrite.vui_written += bytes;
CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n",
npages, bytes, vio->u.readwrite.vui_written);
/* the first page must have been written. */
vio->u.readwrite.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)) || prio > IO_PRIO_NORMAL) {
struct ll_inode_info *lli = ll_i2info(inode);
rc = vvp_io_commit_sync(env, io, queue,
vio->u.readwrite.vui_from,
vio->u.readwrite.vui_to);
if (rc > 0) {
vio->u.readwrite.vui_written += rc;
rc = 0;
}
if (lli->lli_clob != NULL)
lov_read_and_clear_async_rc(lli->lli_clob);
lli->lli_async_rc = 0;
}
/* 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, true);
if (!PageDirty(cl_page_vmpage(page)))
cl_page_discard(env, io, page);
cl_page_disown(env, io, page);
/* held in ll_cl_init() */
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);
struct file *file = vio->vui_fd->fd_file;
ssize_t result = 0;
loff_t pos = io->u.ci_wr.wr.crw_pos;
size_t crw_bytes = io->u.ci_wr.wr.crw_bytes;
bool lock_inode = !IS_NOSEC(inode);
size_t ci_bytes = io->ci_bytes;
struct iov_iter iter;
size_t written = 0;
ENTRY;
trunc_sem_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);
io->u.ci_wr.wr.crw_pos = i_size_read(inode);
if (io->u.ci_wr.wr_append_lockpos <
io->u.ci_wr.wr.crw_pos + io->u.ci_wr.wr.crw_bytes) {
CDEBUG(D_VFSTRACE, "size changed during append old size %llu, new size %llu, bytes %lu\n",
pos, io->u.ci_wr.wr.crw_pos, io->ci_bytes);
if (io->ci_bytes == 0)
io->ci_need_restart = 1;
RETURN(0);
}
pos = vio->vui_iocb->ki_pos = io->u.ci_wr.wr.crw_pos;
} else {
LASSERTF(vio->vui_iocb->ki_pos == pos,
"ki_pos %lld [%lld, %lld)\n",
vio->vui_iocb->ki_pos,
pos, pos + crw_bytes);
}
CDEBUG(D_VFSTRACE, DNAME": write [%llu, %llu) append %d append lockpos "
"%llu\n", encode_fn_file(file), pos, pos + crw_bytes,
cl_io_is_append(io), io->u.ci_wr.wr_append_lockpos);
/* 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 + crw_bytes > ll_file_maxbytes(inode)) {
CDEBUG(D_INODE,
"%s: file %s ("DFID") offset %llu > maxbytes %llu\n",
ll_i2sbi(inode)->ll_fsname,
file_dentry(file)->d_name.name,
PFID(ll_inode2fid(inode)), pos + crw_bytes,
ll_file_maxbytes(inode));
RETURN(-EFBIG);
}
/* Tests to verify we take the i_mutex correctly */
if (CFS_FAIL_CHECK(OBD_FAIL_LLITE_IMUTEX_SEC) && !lock_inode)
RETURN(-EINVAL);
if (CFS_FAIL_CHECK(OBD_FAIL_LLITE_IMUTEX_NOSEC) && lock_inode)
RETURN(-EINVAL);
if (!iocb_ki_flags_check(vio->vui_iocb, IOCB_DIRECT)) {
result = cl_io_lru_reserve(env, io, pos, crw_bytes);
if (result)
RETURN(result);
}
if (vio->vui_iter == NULL) {
/* 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.
*/
lock_inode = !IS_NOSEC(inode);
iter = *vio->vui_iter;
if (unlikely(lock_inode))
inode_lock(inode);
result = __generic_file_write_iter(vio->vui_iocb, &iter);
if (unlikely(lock_inode))
inode_unlock(inode);
written = result;
if (result > 0)
result = generic_write_sync(vio->vui_iocb, result);
}
if (result > 0) {
result = vvp_io_write_commit(env, io, IO_PRIO_NORMAL);
/* Simulate short commit */
if (CFS_FAULT_CHECK(OBD_FAIL_LLITE_SHORT_COMMIT)) {
vio->u.readwrite.vui_written >>= 1;
if (vio->u.readwrite.vui_written > 0)
io->ci_need_restart = 1;
}
if (vio->u.readwrite.vui_written > 0) {
result = vio->u.readwrite.vui_written;
CDEBUG(D_VFSTRACE, DNAME": write bytes %zd, result: %zd\n",
encode_fn_file(file), io->ci_bytes, result);
io->ci_bytes += result;
} else {
io->ci_continue = 0;
}
}
if (vio->vui_iocb->ki_pos != (pos + io->ci_bytes - ci_bytes)) {
CDEBUG(D_VFSTRACE,
DNAME": write position mismatch: ki_pos %lld vs. pos %lld, written %zd, commit %ld: rc = %zd\n",
encode_fn_file(file), vio->vui_iocb->ki_pos,
pos + io->ci_bytes - ci_bytes, written,
io->ci_bytes - ci_bytes, result);
/*
* Rewind ki_pos and vui_iter to where it has
* successfully committed.
*/
vio->vui_iocb->ki_pos = pos + io->ci_bytes - ci_bytes;
}
if (result > 0 || result == -EIOCBQUEUED) {
set_bit(LLIF_DATA_MODIFIED, &ll_i2info(inode)->lli_flags);
if (result != -EIOCBQUEUED && result < crw_bytes)
io->ci_continue = 0;
if (result > 0)
result = 0;
/* move forward */
if (result == -EIOCBQUEUED) {
io->ci_bytes += vio->u.readwrite.vui_written;
vio->vui_iocb->ki_pos = pos +
vio->u.readwrite.vui_written;
}
}
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);
trunc_sem_up_read(&lli->lli_trunc_sem);
}
static void vvp_io_write_end(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct inode *inode = vvp_object_inode(ios->cis_obj);
struct cl_io *io = ios->cis_io;
vvp_io_rw_end(env, ios);
/* Update size and blocks for LSOM (best effort) */
if (!io->ci_ignore_layout && cl_io_is_sync_write(io))
ll_merge_attr_try(env, inode);
}
static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
{
struct vm_fault *vmf = cfio->ft_vmf;
cfio->ft_flags = ll_filemap_fault(cfio->ft_vma, vmf);
cfio->ft_flags_valid = 1;
if (vmf->page) {
/* success, vmpage is locked */
LL_CDEBUG_PAGE(D_PAGE, vmf->page, "got addr %p type NOPAGE\n",
(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) {
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 folio_batch *fbatch)
{
vvp_set_batch_dirty(fbatch);
}
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;
ENTRY;
trunc_sem_down_read_nowait(&lli->lli_trunc_sem);
/* offset of the last byte on the page */
offset = ((fio->ft_index + 1) << PAGE_SHIFT) - 1;
LASSERT((offset >> PAGE_SHIFT) == fio->ft_index);
result = vvp_prep_size(env, obj, io, 0, offset + 1, NULL);
if (result != 0)
RETURN(result);
CFS_FAIL_TIMEOUT(OBD_FAIL_LLITE_FAULT_PAUSE, cfs_fail_val);
/* must return locked page */
if (fio->ft_mkwrite) {
LASSERT(cfio->ft_vmpage != NULL);
vmpage = cfio->ft_vmpage;
lock_page(vmpage);
/**
* page was turncated and lock was cancelled, return ENODATA
* so that VM_FAULT_NOPAGE will be returned to handle_mm_fault()
* XXX: cannot return VM_FAULT_RETRY to vfs since we cannot
* release mmap_lock and VM_FAULT_RETRY implies that the
* mmap_lock is released.
*/
if (!PageUptodate(vmpage))
GOTO(out, result = -ENODATA);
} else {
result = vvp_io_kernel_fault(cfio);
if (result != 0)
RETURN(result);
}
vmpage = cfio->ft_vmpage;
LASSERT(PageLocked(vmpage));
if (CFS_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
generic_error_remove_folio(vmpage->mapping, page_folio(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.
*/
GOTO(out, result = + 1);
}
last_index = (size - 1) >> PAGE_SHIFT;
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
*/
GOTO(out, result = -ENODATA);
}
}
page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE);
if (IS_ERR(page))
GOTO(out, result = PTR_ERR(page));
/* if page will be written, then add this page into cache earlier. */
if (fio->ft_mkwrite) {
wait_on_page_writeback(vmpage);
if (!PageDirty(vmpage)) {
struct cl_page_list *plist = &vio->u.fault.ft_queue;
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, true);
/* size fixup */
if (last_index == cl_page_index(page))
to = ((size - 1) & ~PAGE_MASK) + 1;
/* 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,
IO_PRIO_NORMAL);
/* Have overquota flag, trying sync write to check
* whether indeed out of quota
*/
if (result == -EDQUOT) {
cl_page_get(page);
result = vvp_io_commit_sync(env, io,
plist, 0, to);
if (result >= 0) {
io->ci_noquota = 1;
cl_page_own(env, io, page);
cl_page_list_add(plist, page, true);
result = cl_io_commit_async(env, io,
plist, 0, to,
mkwrite_commit_callback,
IO_PRIO_NORMAL);
io->ci_noquota = 0;
} else {
cl_page_put(env, page);
}
}
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, result);
} else {
CDEBUG(D_DENTRY,
"inode %p need_sync_to_oss "DFID"\n",
inode, PFID(&ll_i2info(inode)->lli_fid));
ll_i2info(inode)->lli_need_sync_to_oss = true;
cl_page_disown(env, io, page);
}
}
}
/*
* The ft_index is only used in the case of 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_bytes = size - (fio->ft_index << PAGE_SHIFT);
else
fio->ft_bytes = PAGE_SIZE;
fio->ft_page = page;
EXIT;
out:
/* return unlocked vmpage to avoid deadlocking */
if (vmpage != NULL)
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));
trunc_sem_up_read(&lli->lli_trunc_sem);
}
static int vvp_io_fsync_start(const struct lu_env *env,
const struct cl_io_slice *ios)
{
/* 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 void vvp_io_fsync_end(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct inode *inode = vvp_object_inode(ios->cis_obj);
struct cl_io *io = ios->cis_io;
/* Update size and blocks for LSOM (best effort) */
if (!io->ci_ignore_layout)
ll_merge_attr_try(env, inode);
}
static int vvp_io_read_ahead_prep(const struct lu_env *env,
const struct cl_io_slice *ios,
pgoff_t start, struct cl_read_ahead *ra)
{
int result = 0;
ENTRY;
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->lfd_file_flags &
LL_FILE_GROUP_LOCKED)) {
ra->cra_end_idx = CL_PAGE_EOF;
result = 1; /* no need to call down */
}
}
RETURN(result);
}
static int vvp_io_lseek_lock(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
__u64 lock_start = io->u.ci_lseek.ls_start;
__u64 lock_end = OBD_OBJECT_EOF;
__u32 enqflags = CEF_MUST; /* always take client lock */
return vvp_io_one_lock(env, io, enqflags, CLM_READ,
lock_start, lock_end);
}
static int vvp_io_lseek_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);
__u64 start = io->u.ci_lseek.ls_start;
inode_lock(inode);
inode_dio_wait(inode);
/* At the moment we have DLM lock so just update inode
* to know the file size.
*/
ll_merge_attr(env, inode);
if (start >= i_size_read(inode)) {
io->u.ci_lseek.ls_result = -ENXIO;
return -ENXIO;
}
return 0;
}
static void vvp_io_lseek_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);
if (io->u.ci_lseek.ls_result > i_size_read(inode))
io->u.ci_lseek.ls_result = -ENXIO;
inode_unlock(inode);
}
static const struct cl_io_operations vvp_io_ops = {
.op = {
[CIT_READ] = {
.cio_fini = vvp_io_fini,
.cio_iter_init = vvp_io_read_iter_init,
.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_write_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,
.cio_end = vvp_io_fsync_end,
},
[CIT_GLIMPSE] = {
.cio_fini = vvp_io_fini
},
[CIT_MISC] = {
.cio_fini = vvp_io_fini
},
[CIT_LADVISE] = {
.cio_fini = vvp_io_fini
},
[CIT_LSEEK] = {
.cio_fini = vvp_io_fini,
.cio_lock = vvp_io_lseek_lock,
.cio_start = vvp_io_lseek_start,
.cio_end = vvp_io_lseek_end,
},
},
.cio_read_ahead_prep = vvp_io_read_ahead_prep,
};
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));
ENTRY;
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 bytes;
struct ll_inode_info *lli = ll_i2info(inode);
struct job_info ji;
bytes = io->u.ci_rw.crw_bytes;
/* "If nbyte is 0, read() will return 0 and have no other
* results." -- Single Unix Spec
*/
if (bytes == 0)
result = 1;
else
vio->vui_tot_bytes = bytes;
/* this might sleep */
lustre_get_jobid(ji.ji_jobid, sizeof(ji.ji_jobid));
ji.ji_uid = from_kuid(&init_user_ns, current_uid());
ji.ji_gid = from_kgid(&init_user_ns, current_gid());
/* for read/write, we store the process jobid/gid/uid 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/user/group.
*/
write_seqlock(&lli->lli_jobinfo_seqlock);
memcpy(&lli->lli_jobinfo, &ji, sizeof(ji));
write_sequnlock(&lli->lli_jobinfo_seqlock);
} 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.
*
* However, fsync operations should NOT acquire layout locks because:
* 1. fsync only flushes already-mapped pages to disk
* 2. The mapping from file offsets to OST objects already occurred
* during the original write operations that populated the page cache
* 3. Layout changes should only affect NEW writes, not existing cache
* 4. Acquiring layout locks during fsync can cause deadlocks when
* fsync is called from within write operations (EX-12989)
*/
if (result == 0 && !io->ci_ignore_layout && io->ci_type != CIT_FSYNC) {
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 ingore this error
* and continue with dirty flush. LU-3230.
*/
result = 0;
if (result < 0)
CERROR("%s: refresh file layout " DFID " error %d.\n",
ll_i2sbi(inode)->ll_fsname,
PFID(lu_object_fid(&obj->co_lu)), result);
}
#ifdef HAVE_INVALIDATE_LOCK
if (io->ci_invalidate_page_cache)
filemap_invalidate_lock(inode->i_mapping);
#endif /* HAVE_INVALIDATE_LOCK */
io->ci_result = result < 0 ? result : 0;
RETURN(result);
}
