-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2014, 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
-#ifndef __KERNEL__
-# error This file is kernel only.
-#endif
#include <obd.h>
-#include <lustre_lite.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);
-
/**
- * True, if \a io is a normal io, False for sendfile() / splice_{read|write}
+ * True, if \a io is a normal io, False for splice_{read,write}
*/
int cl_is_normalio(const struct lu_env *env, const struct cl_io *io)
{
return vio->cui_io_subtype == IO_NORMAL;
}
+/**
+ * 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 *cio = 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) != cio->cui_layout_gen) {
+ io->ci_need_restart = 1;
+ /* this will return application 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;
+}
+
/*****************************************************************************
*
* io operations.
*
*/
-static int vvp_io_fault_iter_init(const struct lu_env *env,
- const struct cl_io_slice *ios)
+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);
- struct inode *inode = ccc_object_inode(ios->cis_obj);
+ struct vvp_io *cio = cl2vvp_io(env, ios);
+
+ cl_page_list_init(&cio->u.write.cui_queue);
+ cio->u.write.cui_written = 0;
+ cio->u.write.cui_from = 0;
+ cio->u.write.cui_to = PAGE_SIZE;
- LASSERT(inode ==
- cl2ccc_io(env, ios)->cui_fd->fd_file->f_dentry->d_inode);
- vio->u.fault.ft_mtime = LTIME_S(inode->i_mtime);
- return 0;
+ return 0;
}
-static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
+static void vvp_io_write_iter_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 *cio = cl2vvp_io(env, ios);
- CLOBINVRNT(env, obj, ccc_object_invariant(obj));
- if (io->ci_type == CIT_READ) {
- struct vvp_io *vio = cl2vvp_io(env, ios);
- struct ccc_io *cio = cl2ccc_io(env, ios);
+ LASSERT(cio->u.write.cui_queue.pl_nr == 0);
+}
- if (vio->cui_ra_window_set)
- ll_ra_read_ex(cio->cui_fd->fd_file, &vio->cui_bead);
- }
+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 == vio->cui_fd->fd_file->f_dentry->d_inode);
+ vio->u.fault.ft_mtime = LTIME_S(inode->i_mtime);
+ 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 *cio = 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,
+ cio->cui_layout_gen, io->ci_restore_needed);
+
+ if (io->ci_restore_needed == 1) {
+ 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 = cio->cui_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)),
+ cio->cui_layout_gen, gen);
+ /* today successful restore is the only possible
+ * case */
+ /* restore was done, clear restoring state */
+ ll_i2info(vvp_object_inode(obj))->lli_flags &=
+ ~LLIF_FILE_RESTORING;
+ }
+ }
}
static void vvp_io_fault_fini(const struct lu_env *env,
struct cl_io *io = ios->cis_io;
struct cl_page *page = io->u.ci_fault.ft_page;
- CLOBINVRNT(env, io->ci_obj, ccc_object_invariant(io->ci_obj));
+ CLOBINVRNT(env, io->ci_obj, vvp_object_invariant(io->ci_obj));
if (page != NULL) {
lu_ref_del(&page->cp_reference, "fault", io);
vvp_io_fini(env, ios);
}
-enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma)
+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
}
static int vvp_mmap_locks(const struct lu_env *env,
- struct ccc_io *vio, struct cl_io *io)
+ struct vvp_io *vio, struct cl_io *io)
{
struct ccc_thread_info *cti = ccc_env_info(env);
+ struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct cl_lock_descr *descr = &cti->cti_descr;
ldlm_policy_data_t policy;
unsigned long addr;
unsigned long seg;
ssize_t count;
- int result;
+ int result = 0;
ENTRY;
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
if (!cl_is_normalio(env, io))
RETURN(0);
+ if (vio->cui_iov == NULL) /* nfs or loop back device write */
+ RETURN(0);
+
+ /* No MM (e.g. NFS)? No vmas too. */
+ if (mm == NULL)
+ RETURN(0);
+
for (seg = 0; seg < vio->cui_nrsegs; seg++) {
const struct iovec *iv = &vio->cui_iov[seg];
count += addr & (~CFS_PAGE_MASK);
addr &= CFS_PAGE_MASK;
- while((vma = our_vma(addr, count)) != NULL) {
+
+ down_read(&mm->mmap_sem);
+ while((vma = our_vma(mm, addr, count)) != NULL) {
struct inode *inode = vma->vm_file->f_dentry->d_inode;
int flags = CEF_MUST;
- if (ll_file_nolock(vma->vm_file)) {
- /*
- * For no lock case, a lockless lock will be
- * generated.
- */
- flags = CEF_NEVER;
- }
+ 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
descr->cld_mode, descr->cld_start,
descr->cld_end);
- if (result < 0)
- RETURN(result);
+ if (result < 0)
+ break;
- if (vma->vm_end - addr >= count)
- break;
+ if (vma->vm_end - addr >= count)
+ break;
- count -= vma->vm_end - addr;
- addr = vma->vm_end;
- }
- }
- RETURN(0);
+ count -= vma->vm_end - addr;
+ addr = vma->vm_end;
+ }
+ up_read(&mm->mmap_sem);
+ if (result < 0)
+ break;
+ }
+ RETURN(result);
}
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 ccc_io *cio = ccc_env_io(env);
- int result;
- int ast_flags = 0;
+ struct vvp_io *cio = vvp_env_io(env);
+ int result;
+ int ast_flags = 0;
- LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
- ENTRY;
+ LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
+ ENTRY;
- ccc_io_update_iov(env, cio, io);
+ vvp_io_update_iov(env, cio, io);
+
+ if (io->u.ci_rw.crw_nonblock)
+ ast_flags |= CEF_NONBLOCK;
+
+ result = vvp_mmap_locks(env, cio, io);
+ if (result == 0)
+ result = vvp_io_one_lock(env, io, ast_flags, mode, start, end);
- if (io->u.ci_rw.crw_nonblock)
- ast_flags |= CEF_NONBLOCK;
- result = vvp_mmap_locks(env, cio, io);
- if (result == 0)
- result = ccc_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 ll_inode_info *lli = ll_i2info(ccc_object_inode(io->ci_obj));
- int result;
-
- ENTRY;
- /* XXX: Layer violation, we shouldn't see lsm at llite level. */
- if (lli->lli_smd != NULL) /* lsm-less file, don't need to lock */
- result = vvp_io_rw_lock(env, io, CLM_READ,
- io->u.ci_rd.rd.crw_pos,
- io->u.ci_rd.rd.crw_pos +
- io->u.ci_rd.rd.crw_count - 1);
- else
- result = 0;
- RETURN(result);
+ 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_count - 1);
+ RETURN(result);
}
static int vvp_io_fault_lock(const struct lu_env *env,
/*
* XXX LDLM_FL_CBPENDING
*/
- return ccc_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);
+ 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,
}
static int vvp_io_setattr_iter_init(const struct lu_env *env,
- const struct cl_io_slice *ios)
+ const struct cl_io_slice *ios)
{
- struct ccc_io *cio = ccc_env_io(env);
- struct inode *inode = ccc_object_inode(ios->cis_obj);
-
- /*
- * We really need to get our PW lock before we change inode->i_size.
- * If we don't we can race with other i_size updaters on our node,
- * like ll_file_read. We can also race with i_size propogation to
- * other nodes through dirtying and writeback of final cached pages.
- * This last one is especially bad for racing o_append users on other
- * nodes.
- */
- UNLOCK_INODE_MUTEX(inode);
- if (cl_io_is_trunc(ios->cis_io))
- UP_WRITE_I_ALLOC_SEM(inode);
- cio->u.setattr.cui_locks_released = 1;
- return 0;
+ return 0;
}
/**
static int vvp_io_setattr_lock(const struct lu_env *env,
const struct cl_io_slice *ios)
{
- struct ccc_io *cio = ccc_env_io(env);
- struct cl_io *io = ios->cis_io;
- size_t new_size;
- __u32 enqflags = 0;
+ struct vvp_io *cio = vvp_env_io(env);
+ 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;
new_size = 0;
}
cio->u.setattr.cui_local_lock = SETATTR_EXTENT_LOCK;
- return ccc_io_one_lock(env, io, enqflags, CLM_WRITE,
- new_size, OBD_OBJECT_EOF);
+
+ 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. lov_stripe_lock()
- * is grabbed by ll_truncate() only over call to obd_adjust_kms(). If
- * vmtruncate returns 0, then ll_truncate dropped ll_inode_size_lock()
- */
- ll_inode_size_lock(inode, 0);
- result = vmtruncate(inode, size);
- if (result != 0)
- ll_inode_size_unlock(inode, 0);
-
- return result;
+ 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);
+
+ ll_truncate_pagecache(inode, size);
+ ll_inode_size_unlock(inode);
+ return result;
}
static int vvp_io_setattr_trunc(const struct lu_env *env,
const struct cl_io_slice *ios,
struct inode *inode, loff_t size)
{
- struct vvp_io *vio = cl2vvp_io(env, ios);
- struct cl_io *io = ios->cis_io;
- struct cl_object *obj = ios->cis_obj;
- pgoff_t start = cl_index(obj, size);
- int result;
-
- DOWN_WRITE_I_ALLOC_SEM(inode);
-
- result = vvp_do_vmtruncate(inode, size);
-
- /*
- * If a page is partially truncated, keep it owned across truncate to
- * prevent... races.
- *
- * XXX this properly belongs to osc, because races in question are OST
- * specific.
- */
- if (cl_offset(obj, start) != size) {
- struct cl_object_header *hdr;
-
- hdr = cl_object_header(obj);
- cfs_spin_lock(&hdr->coh_page_guard);
- vio->cui_partpage = cl_page_lookup(hdr, start);
- cfs_spin_unlock(&hdr->coh_page_guard);
-
- if (vio->cui_partpage != NULL)
- /*
- * Wait for the transfer completion for a partially
- * truncated page to avoid dead-locking an OST with
- * the concurrent page-wise overlapping WRITE and
- * PUNCH requests. BUG:17397.
- *
- * Partial page is disowned in vvp_io_trunc_end().
- */
- cl_page_own(env, io, vio->cui_partpage);
- } else
- vio->cui_partpage = NULL;
- return result;
+ inode_dio_wait(inode);
+ return 0;
}
static int vvp_io_setattr_time(const struct lu_env *env,
attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
valid |= CAT_MTIME;
}
- result = cl_object_attr_set(env, obj, attr, valid);
- cl_object_attr_unlock(obj);
+ result = cl_object_attr_update(env, obj, attr, valid);
+ cl_object_attr_unlock(obj);
- return result;
+ return result;
}
static int vvp_io_setattr_start(const struct lu_env *env,
- const struct cl_io_slice *ios)
+ const struct cl_io_slice *ios)
{
- struct ccc_io *cio = cl2ccc_io(env, ios);
- struct cl_io *io = ios->cis_io;
- struct inode *inode = ccc_object_inode(io->ci_obj);
-
- LASSERT(cio->u.setattr.cui_locks_released);
-
- LOCK_INODE_MUTEX(inode);
- cio->u.setattr.cui_locks_released = 0;
-
- if (cl_io_is_trunc(io))
- return vvp_io_setattr_trunc(env, ios, inode,
- io->u.ci_setattr.sa_attr.lvb_size);
- else
- return vvp_io_setattr_time(env, ios);
+ struct cl_io *io = ios->cis_io;
+ struct inode *inode = vvp_object_inode(io->ci_obj);
+ int result = 0;
+
+ mutex_lock(&inode->i_mutex);
+ if (cl_io_is_trunc(io))
+ result = vvp_io_setattr_trunc(env, ios, inode,
+ io->u.ci_setattr.sa_attr.lvb_size);
+ if (result == 0)
+ result = vvp_io_setattr_time(env, ios);
+ return result;
}
static void vvp_io_setattr_end(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 inode *inode = ccc_object_inode(io->ci_obj);
-
- if (!cl_io_is_trunc(io))
- return;
- if (vio->cui_partpage != NULL) {
- cl_page_disown(env, ios->cis_io, vio->cui_partpage);
- cl_page_put(env, vio->cui_partpage);
- vio->cui_partpage = NULL;
- }
-
- /*
- * Do vmtruncate again, to remove possible stale pages populated by
- * competing read threads. bz20645.
- */
- vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
+ struct cl_io *io = ios->cis_io;
+ struct inode *inode = vvp_object_inode(io->ci_obj);
+
+ 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_dio_write_done(inode);
+ }
+ mutex_unlock(&inode->i_mutex);
}
static void vvp_io_setattr_fini(const struct lu_env *env,
- const struct cl_io_slice *ios)
+ const struct cl_io_slice *ios)
{
- struct ccc_io *cio = ccc_env_io(env);
- struct cl_io *io = ios->cis_io;
- struct inode *inode = ccc_object_inode(ios->cis_io->ci_obj);
-
- if (cio->u.setattr.cui_locks_released) {
- LOCK_INODE_MUTEX(inode);
- if (cl_io_is_trunc(io))
- DOWN_WRITE_I_ALLOC_SEM(inode);
- cio->u.setattr.cui_locks_released = 0;
- }
- vvp_io_fini(env, ios);
+ vvp_io_fini(env, ios);
}
-#ifdef HAVE_FILE_READV
-static ssize_t lustre_generic_file_read(struct file *file,
- struct ccc_io *vio, loff_t *ppos)
-{
- return generic_file_readv(file, vio->cui_iov, vio->cui_nrsegs, ppos);
-}
-
-static ssize_t lustre_generic_file_write(struct file *file,
- struct ccc_io *vio, loff_t *ppos)
-{
- return generic_file_writev(file, vio->cui_iov, vio->cui_nrsegs, ppos);
-}
-#else
-static ssize_t lustre_generic_file_read(struct file *file,
- struct ccc_io *vio, loff_t *ppos)
-{
- return generic_file_aio_read(vio->cui_iocb, vio->cui_iov,
- vio->cui_nrsegs, *ppos);
-}
-
-static ssize_t lustre_generic_file_write(struct file *file,
- struct ccc_io *vio, loff_t *ppos)
-{
- return generic_file_aio_write(vio->cui_iocb, vio->cui_iov,
- vio->cui_nrsegs, *ppos);
-}
-#endif
-
static int vvp_io_read_start(const struct lu_env *env,
- const struct cl_io_slice *ios)
+ const struct cl_io_slice *ios)
{
- struct vvp_io *vio = cl2vvp_io(env, 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);
- struct ll_ra_read *bead = &vio->cui_bead;
- struct file *file = cio->cui_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 = cio->cui_tot_count;
+ 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 file *file = vio->cui_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->cui_tot_count;
int exceed = 0;
- CLOBINVRNT(env, obj, ccc_object_invariant(obj));
+ CLOBINVRNT(env, obj, vvp_object_invariant(obj));
CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt);
- result = ccc_prep_size(env, obj, io, pos, tot, 1, &exceed);
+ 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)
"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;
+ /* turn off the kernel's read-ahead */
+ vio->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 CFS_PAGE_SIZE
- */
- bead->lrr_count = cl_index(obj, tot + CFS_PAGE_SIZE - 1);
- ll_ra_read_in(file, bead);
- }
+ /* initialize read-ahead window once per syscall */
+ if (!vio->cui_ra_valid) {
+ vio->cui_ra_valid = true;
+ vio->cui_ra_start = cl_index(obj, pos);
+ vio->cui_ra_count = cl_index(obj, tot + PAGE_CACHE_SIZE - 1);
+ ll_ras_enter(file);
+ }
/* BUG: 5972 */
file_accessed(file);
switch (vio->cui_io_subtype) {
case IO_NORMAL:
- result = lustre_generic_file_read(file, cio, &pos);
- break;
-#ifdef HAVE_KERNEL_SENDFILE
- case IO_SENDFILE:
- result = generic_file_sendfile(file, &pos, cnt,
- vio->u.sendfile.cui_actor,
- vio->u.sendfile.cui_target);
- break;
-#endif
-#ifdef HAVE_KERNEL_SPLICE_READ
- case IO_SPLICE:
- result = generic_file_splice_read(file, &pos,
- vio->u.splice.cui_pipe, cnt,
- vio->u.splice.cui_flags);
- break;
-#endif
- default:
- CERROR("Wrong IO type %u\n", vio->cui_io_subtype);
- LBUG();
- }
+ LASSERT(vio->cui_iocb->ki_pos == pos);
+ result = generic_file_aio_read(vio->cui_iocb,
+ vio->cui_iov, vio->cui_nrsegs,
+ vio->cui_iocb->ki_pos);
+ 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, 0);
- result = 0;
- }
- return result;
+ if (result >= 0) {
+ if (result < cnt)
+ io->ci_continue = 0;
+ io->ci_nob += result;
+ ll_rw_stats_tally(ll_i2sbi(inode), current->pid, vio->cui_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;
+ 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);
+
+ 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 vvp_page *vpg;
+ struct page *vmpage = page->cp_vmpage;
+ struct cl_object *clob = cl_io_top(io)->ci_obj;
+
+ SetPageUptodate(vmpage);
+ set_page_dirty(vmpage);
+
+ vpg = cl2vvp_page(cl_object_page_slice(clob, page));
+ vvp_write_pending(cl2vvp(clob), vpg);
+
+ 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 *cio = vvp_env_io(env);
+ struct cl_page_list *queue = &cio->u.write.cui_queue;
+ struct cl_page *page;
+ int rc = 0;
+ int bytes = 0;
+ unsigned int npages = cio->u.write.cui_queue.pl_nr;
+ ENTRY;
+
+ if (npages == 0)
+ RETURN(0);
+
+ CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d\n",
+ npages, cio->u.write.cui_from, cio->u.write.cui_to);
+
+ LASSERT(page_list_sanity_check(obj, queue));
+
+ /* submit IO with async write */
+ rc = cl_io_commit_async(env, io, queue,
+ cio->u.write.cui_from, cio->u.write.cui_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 -= cio->u.write.cui_from;
+ if (queue->pl_nr == 0) /* last page */
+ bytes -= PAGE_SIZE - cio->u.write.cui_to;
+ LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages);
+
+ cio->u.write.cui_written += bytes;
+
+ CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n",
+ npages, bytes, cio->u.write.cui_written);
+
+ /* the first page must have been written. */
+ cio->u.write.cui_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,
+ cio->u.write.cui_from,
+ cio->u.write.cui_to);
+ if (rc > 0) {
+ cio->u.write.cui_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 ccc_io *cio = cl2ccc_io(env, ios);
+ struct vvp_io *cio = 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 file *file = cio->cui_fd->fd_file;
+ struct inode *inode = vvp_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;
ENTRY;
+ 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 = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
-#ifndef HAVE_FILE_WRITEV
cio->cui_iocb->ki_pos = pos;
-#endif
- }
-
- CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
-
- if (cio->cui_iov == NULL) /* from a temp io in ll_cl_init(). */
- result = 0;
- else
- result = lustre_generic_file_write(file, cio, &pos);
-
- 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, 0);
- result = 0;
- }
- RETURN(result);
+ } else {
+ LASSERT(cio->cui_iocb->ki_pos == pos);
+ }
+
+ CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
+
+ if (cio->cui_iov == 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.
+ */
+ result = __generic_file_aio_write(cio->cui_iocb,
+ cio->cui_iov, cio->cui_nrsegs,
+ &cio->cui_iocb->ki_pos);
+ if (result > 0 || result == -EIOCBQUEUED) {
+ ssize_t err;
+
+ err = generic_write_sync(cio->cui_iocb->ki_filp,
+ pos, result);
+ if (err < 0 && result > 0)
+ result = err;
+ }
+
+ }
+ if (result > 0) {
+ result = vvp_io_write_commit(env, io);
+ if (cio->u.write.cui_written > 0) {
+ result = cio->u.write.cui_written;
+ io->ci_nob += result;
+
+ CDEBUG(D_VFSTRACE, "write: nob %zd, result: %zd\n",
+ io->ci_nob, result);
+ }
+ }
+ if (result > 0) {
+ struct ll_inode_info *lli = ll_i2info(inode);
+
+ spin_lock(&lli->lli_lock);
+ lli->lli_flags |= LLIF_DATA_MODIFIED;
+ spin_unlock(&lli->lli_lock);
+
+ if (result < cnt)
+ io->ci_continue = 0;
+ ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
+ cio->cui_fd, pos, result, WRITE);
+ result = 0;
+ }
+
+ RETURN(result);
}
-#ifndef HAVE_VM_OP_FAULT
static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
{
- cfs_page_t *vmpage;
-
- vmpage = filemap_nopage(cfio->ft_vma, cfio->nopage.ft_address,
- cfio->nopage.ft_type);
-
- if (vmpage == NOPAGE_SIGBUS) {
- CDEBUG(D_PAGE, "got addr %lu type %lx - SIGBUS\n",
- cfio->nopage.ft_address,(long)cfio->nopage.ft_type);
- return -EFAULT;
- } else if (vmpage == NOPAGE_OOM) {
- CDEBUG(D_PAGE, "got addr %lu type %lx - OOM\n",
- cfio->nopage.ft_address, (long)cfio->nopage.ft_type);
- return -ENOMEM;
- }
+ struct vm_fault *vmf = cfio->ft_vmf;
- LL_CDEBUG_PAGE(D_PAGE, vmpage, "got addr %lu type %lx\n",
- cfio->nopage.ft_address, (long)cfio->nopage.ft_type);
+ cfio->ft_flags = filemap_fault(cfio->ft_vma, vmf);
+ cfio->ft_flags_valid = 1;
- cfio->ft_vmpage = vmpage;
+ if (vmf->page) {
+ LL_CDEBUG_PAGE(D_PAGE, vmf->page, "got addr %p type NOPAGE\n",
+ vmf->virtual_address);
+ if (unlikely(!(cfio->ft_flags & VM_FAULT_LOCKED))) {
+ lock_page(vmf->page);
+ cfio->ft_flags |= VM_FAULT_LOCKED;
+ }
- return 0;
-}
-#else
-static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
-{
- cfio->fault.ft_flags = filemap_fault(cfio->ft_vma, cfio->fault.ft_vmf);
-
- if (cfio->fault.ft_vmf->page) {
- LL_CDEBUG_PAGE(D_PAGE, cfio->fault.ft_vmf->page,
- "got addr %p type NOPAGE\n",
- cfio->fault.ft_vmf->virtual_address);
- /*XXX workaround to bug in CLIO - he deadlocked with
- lock cancel if page locked */
- if (likely(cfio->fault.ft_flags & VM_FAULT_LOCKED)) {
- unlock_page(cfio->fault.ft_vmf->page);
- cfio->fault.ft_flags &= ~VM_FAULT_LOCKED;
- }
+ cfio->ft_vmpage = vmf->page;
- cfio->ft_vmpage = cfio->fault.ft_vmf->page;
- return 0;
- }
+ return 0;
+ }
- if (unlikely (cfio->fault.ft_flags & VM_FAULT_ERROR)) {
- CDEBUG(D_PAGE, "got addr %p - SIGBUS\n",
- cfio->fault.ft_vmf->virtual_address);
- return -EFAULT;
- }
+ if (cfio->ft_flags & VM_FAULT_SIGBUS) {
+ CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", vmf->virtual_address);
+ return -EFAULT;
+ }
- if (unlikely (cfio->fault.ft_flags & VM_FAULT_NOPAGE)) {
- CDEBUG(D_PAGE, "got addr %p - OOM\n",
- cfio->fault.ft_vmf->virtual_address);
- return -ENOMEM;
- }
+ if (cfio->ft_flags & VM_FAULT_OOM) {
+ CDEBUG(D_PAGE, "got addr %p - OOM\n", vmf->virtual_address);
+ return -ENOMEM;
+ }
+
+ if (cfio->ft_flags & VM_FAULT_RETRY)
+ return -EAGAIN;
- CERROR("unknow error in page fault!\n");
- return -EINVAL;
+ CERROR("unknown error in page fault %d\n", cfio->ft_flags);
+
+ return -EINVAL;
}
-#endif
+static void mkwrite_commit_callback(const struct lu_env *env, struct cl_io *io,
+ struct cl_page *page)
+{
+ struct vvp_page *vpg;
+ struct cl_object *clob = cl_io_top(io)->ci_obj;
+
+ set_page_dirty(page->cp_vmpage);
+
+ vpg = cl2vvp_page(cl_object_page_slice(clob, page));
+ vvp_write_pending(cl2vvp(clob), vpg);
+}
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 kernel_result = 0;
- int result = 0;
- struct cl_page *page;
- loff_t size;
- pgoff_t last; /* last page in a file data region */
+ 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 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;
if (fio->ft_executable &&
LTIME_S(inode->i_mtime) != vio->u.fault.ft_mtime)
/* 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, 0, NULL);
- if (result != 0)
- return result;
-
- /* must return unlocked page */
- kernel_result = vvp_io_kernel_fault(cfio);
- if (kernel_result != 0)
- return kernel_result;
-
- /* Temporarily lock vmpage to keep cl_page_find() happy. */
- lock_page(cfio->ft_vmpage);
+ 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 != NULL);
+ 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. */
- page = ERR_PTR(-EFAULT);
- if (likely(cfio->ft_vmpage->mapping != NULL))
- page = cl_page_find(env, obj, fio->ft_index, cfio->ft_vmpage,
- CPT_CACHEABLE);
- unlock_page(cfio->ft_vmpage);
- if (IS_ERR(page)) {
- page_cache_release(cfio->ft_vmpage);
- cfio->ft_vmpage = NULL;
- return PTR_ERR(page);
+ 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);
}
- size = i_size_read(inode);
- last = cl_index(obj, size - 1);
- if (fio->ft_index == last)
+ 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
+ */
+ 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 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 & ~CFS_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, result);
+ } 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
+ else
fio->ft_nob = cl_page_size(obj);
- lu_ref_add(&page->cp_reference, "fault", io);
- fio->ft_page = page;
- /*
- * Certain 2.6 kernels return not-NULL from
- * filemap_nopage() when page is beyond the file size,
- * on the grounds that "An external ptracer can access
- * pages that normally aren't accessible.." Don't
- * propagate such page fault to the lower layers to
- * avoid side-effects like KMS updates.
- */
- if (fio->ft_index > last)
- result = +1;
-
- return result;
-}
-
-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;
- cfs_page_t *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);
-
- ENTRY;
-
- if (sbi->ll_ra_info.ra_max_pages_per_file)
- 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_2queue_add(queue, page);
- if (sbi->ll_ra_info.ra_max_pages_per_file)
- 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,
- int to, 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);
- cl_page_clip(env, page, 0, to);
-
- result = cl_io_submit_sync(env, io, crt, queue, CRP_NORMAL, 0);
- LASSERT(cl_page_is_owned(page, io));
- cl_page_clip(env, page, 0, CFS_PAGE_SIZE);
-
- 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);
+ lu_ref_add(&page->cp_reference, "fault", io);
+ fio->ft_page = page;
+ EXIT;
- return result;
-}
+out:
+ /* return unlocked vmpage to avoid deadlocking */
+ if (vmpage != NULL)
+ unlock_page(vmpage);
-/**
- * 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;
+ cfio->ft_flags &= ~VM_FAULT_LOCKED;
- 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, KM_USER0);
-
- memset(kaddr, 0, cl_page_size(obj));
- kunmap_atomic(kaddr, KM_USER0);
- } else if (cp->cpg_defer_uptodate)
- cp->cpg_ra_used = 1;
- else
- result = vvp_page_sync_io(env, io, pg, cp,
- CFS_PAGE_SIZE, 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;
+ 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)
+static int vvp_io_fsync_start(const struct lu_env *env,
+ const struct cl_io_slice *ios)
{
- struct cl_object *obj = slice->cpl_obj;
- struct ccc_page *cp = cl2ccc_page(slice);
- struct cl_page *pg = slice->cpl_page;
- cfs_page_t *vmpage = cp->cpg_page;
-
- int result;
-
- ENTRY;
-
- 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 == CFS_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);
+ /* 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_commit_write(const struct lu_env *env,
- const struct cl_io_slice *ios,
- const struct cl_page_slice *slice,
- unsigned from, unsigned to)
+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_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);
- cfs_page_t *vmpage = cp->cpg_page;
-
- int result;
- int tallyop;
- loff_t size;
-
- ENTRY;
-
- LINVRNT(cl_page_is_vmlocked(env, pg));
- LASSERT(vmpage->mapping->host == inode);
-
- LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, "commiting 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
- * (/proc/fs/lustre/osc/OSC.../max_dirty_mb)
- *
- */
- if (!PageDirty(vmpage)) {
- tallyop = LPROC_LL_DIRTY_MISSES;
- vvp_write_pending(cl2ccc(obj), cp);
- set_page_dirty(vmpage);
- /* ll_set_page_dirty() does the same for now, but
- * it will not soon. */
- vvp_write_pending(cl2ccc(obj), cp);
- result = cl_page_cache_add(env, io, pg, CRT_WRITE);
- if (result == -EDQUOT)
- /*
- * 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.
- */
- result = vvp_page_sync_io(env, io, pg, cp,
- to, 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);
-
- size = cl_offset(obj, pg->cp_index) + to;
-
- ll_inode_size_lock(inode, 0);
- 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, 0);
-
- RETURN(result);
+ struct cl_io *io = ios->cis_io;
+ struct vvp_page *vpg = cl2vvp_page(slice);
+ struct cl_page *page = slice->cpl_page;
+ struct inode *inode = vvp_object_inode(slice->cpl_obj);
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ struct ll_file_data *fd = cl2vvp_io(env, ios)->cui_fd;
+ struct ll_readahead_state *ras = &fd->fd_ras;
+ struct cl_2queue *queue = &io->ci_queue;
+
+ ENTRY;
+
+ if (sbi->ll_ra_info.ra_max_pages_per_file > 0 &&
+ sbi->ll_ra_info.ra_max_pages > 0)
+ ras_update(sbi, inode, ras, vvp_index(vpg),
+ vpg->vpg_defer_uptodate);
+
+ if (vpg->vpg_defer_uptodate) {
+ vpg->vpg_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_2queue_add(queue, page);
+ if (sbi->ll_ra_info.ra_max_pages_per_file > 0 &&
+ sbi->ll_ra_info.ra_max_pages > 0)
+ ll_readahead(env, io, &queue->c2_qin, ras,
+ vpg->vpg_defer_uptodate);
+
+ RETURN(0);
}
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_advance = ccc_io_advance
- },
+ .op = {
+ [CIT_READ] = {
+ .cio_fini = vvp_io_fini,
+ .cio_lock = vvp_io_read_lock,
+ .cio_start = vvp_io_read_start,
+ .cio_advance = vvp_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
+ .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_advance = vvp_io_advance,
},
[CIT_SETATTR] = {
.cio_fini = vvp_io_setattr_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
+ .cio_end = vvp_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);
- struct ll_sb_info *sbi = ll_i2sbi(inode);
- int result;
-
- CLOBINVRNT(env, obj, ccc_object_invariant(obj));
- ENTRY;
-
- 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) {
- int op;
- size_t count;
+ 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->cui_layout_gen, io->ci_restore_needed);
+
+ CL_IO_SLICE_CLEAN(vio, cui_cl);
+ cl_io_slice_add(io, &vio->cui_cl, obj, &vvp_io_ops);
+ vio->cui_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;
- op = io->ci_type == CIT_READ ?
- LPROC_LL_READ_BYTES : LPROC_LL_WRITE_BYTES;
/* "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;
- cio->cui_tot_nrsegs = 0;
- ll_stats_ops_tally(sbi, op, count);
- }
- } else if (io->ci_type == CIT_SETATTR) {
- if (cl_io_is_trunc(io))
- /* lockless truncate? */
- ll_stats_ops_tally(sbi, LPROC_LL_TRUNC, 1);
- else
- io->ci_lockreq = CILR_MANDATORY;
- }
- RETURN(result);
-}
-
-static struct vvp_io *cl2vvp_io(const struct lu_env *env,
- const struct cl_io_slice *slice)
-{
- /* Caling just for assertion */
- cl2ccc_io(env, slice);
- return vvp_env_io(env);
+ else {
+ vio->cui_tot_count = count;
+ vio->cui_tot_nrsegs = 0;
+ }
+
+ /* 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, &vio->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 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_get_fsname(inode->i_sb, NULL, 0),
+ PFID(lu_object_fid(&obj->co_lu)), result);
+ }
+
+ RETURN(result);
}
-
git://git.whamcloud.com / fs / lustre-release.git / blobdiff