-/* -*- 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.
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
-#ifndef AUTOCONF_INCLUDED
-#include <linux/config.h>
-#endif
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
-#include <linux/smp_lock.h>
#include <linux/unistd.h>
#include <linux/version.h>
-#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
#define DEBUG_SUBSYSTEM S_LLITE
-//#include <lustre_mdc.h>
#include <lustre_lite.h>
#include "llite_internal.h"
#include <linux/lustre_compat25.h>
-#define VMA_DEBUG(vma, fmt, arg...) \
- CDEBUG(D_MMAP, "vma(%p) start(%ld) end(%ld) pgoff(%ld) inode(%p) " \
- "ino(%lu) iname(%s): " fmt, vma, vma->vm_start, vma->vm_end, \
- vma->vm_pgoff, vma->vm_file->f_dentry->d_inode, \
- vma->vm_file->f_dentry->d_inode->i_ino, \
- vma->vm_file->f_dentry->d_iname, ## arg); \
-
struct page *ll_nopage(struct vm_area_struct *vma, unsigned long address,
int *type);
~CFS_PAGE_MASK;
}
-struct vm_area_struct * our_vma(unsigned long addr, size_t count)
+struct vm_area_struct *our_vma(struct mm_struct *mm, unsigned long addr,
+ size_t count)
{
- struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *ret = NULL;
ENTRY;
- /* No MM (e.g. NFS)? No vmas too. */
- if (!mm)
- RETURN(NULL);
+ /* mmap_sem must have been held by caller. */
+ LASSERT(!down_write_trylock(&mm->mmap_sem));
- spin_lock(&mm->page_table_lock);
for(vma = find_vma(mm, addr);
vma != NULL && vma->vm_start < (addr + count); vma = vma->vm_next) {
if (vma->vm_ops && vma->vm_ops == &ll_file_vm_ops &&
break;
}
}
- spin_unlock(&mm->page_table_lock);
RETURN(ret);
}
* \retval EINVAL if env can't allocated
* \return other error codes from cl_io_init.
*/
-int ll_fault_io_init(struct vm_area_struct *vma, struct lu_env **env_ret,
- struct cl_env_nest *nest, pgoff_t index, unsigned long *ra_flags)
+struct cl_io *ll_fault_io_init(struct vm_area_struct *vma,
+ struct lu_env **env_ret,
+ struct cl_env_nest *nest,
+ pgoff_t index, unsigned long *ra_flags)
{
struct file *file = vma->vm_file;
struct inode *inode = file->f_dentry->d_inode;
- const unsigned long writable = VM_SHARED|VM_WRITE;
struct cl_io *io;
struct cl_fault_io *fio;
struct lu_env *env;
ENTRY;
+ *env_ret = NULL;
if (ll_file_nolock(file))
- RETURN(-EOPNOTSUPP);
+ RETURN(ERR_PTR(-EOPNOTSUPP));
/*
* page fault can be called when lustre IO is
* one.
*/
env = cl_env_nested_get(nest);
- if (IS_ERR(env)) {
- *env_ret = NULL;
- RETURN(-EINVAL);
- }
+ if (IS_ERR(env))
+ RETURN(ERR_PTR(-EINVAL));
*env_ret = env;
- io = &ccc_env_info(env)->cti_io;
+ io = ccc_env_thread_io(env);
io->ci_obj = ll_i2info(inode)->lli_clob;
LASSERT(io->ci_obj != NULL);
fio = &io->u.ci_fault;
- fio->ft_index = vma->vm_pgoff + index;
- fio->ft_writable = (vma->vm_flags&writable) == writable;
+ fio->ft_index = index;
fio->ft_executable = vma->vm_flags&VM_EXEC;
/*
* the kernel will not read other pages not covered by ldlm in
* filemap_nopage. we do our readahead in ll_readpage.
*/
- *ra_flags = vma->vm_flags & (VM_RAND_READ|VM_SEQ_READ);
+ if (ra_flags != NULL)
+ *ra_flags = vma->vm_flags & (VM_RAND_READ|VM_SEQ_READ);
vma->vm_flags &= ~VM_SEQ_READ;
vma->vm_flags |= VM_RAND_READ;
- CDEBUG(D_INFO, "vm_flags: %lx (%lu %i %i)\n", vma->vm_flags,
- fio->ft_index, fio->ft_writable, fio->ft_executable);
+ CDEBUG(D_MMAP, "vm_flags: %lx (%lu %d)\n", vma->vm_flags,
+ fio->ft_index, fio->ft_executable);
if (cl_io_init(env, io, CIT_FAULT, io->ci_obj) == 0) {
struct ccc_io *cio = ccc_env_io(env);
cio->cui_fd = fd;
}
- return io->ci_result;
+ return io;
+}
+
+/* Sharing code of page_mkwrite method for rhel5 and rhel6 */
+static int ll_page_mkwrite0(struct vm_area_struct *vma, struct page *vmpage,
+ bool *retry)
+{
+ struct lu_env *env;
+ struct cl_io *io;
+ struct vvp_io *vio;
+ struct cl_env_nest nest;
+ int result;
+ cfs_sigset_t set;
+ struct inode *inode;
+ struct ll_inode_info *lli;
+ ENTRY;
+
+ LASSERT(vmpage != NULL);
+
+ io = ll_fault_io_init(vma, &env, &nest, vmpage->index, NULL);
+ if (IS_ERR(io))
+ GOTO(out, result = PTR_ERR(io));
+
+ result = io->ci_result;
+ if (result < 0)
+ GOTO(out, result);
+
+ io->u.ci_fault.ft_mkwrite = 1;
+ io->u.ci_fault.ft_writable = 1;
+
+ vio = vvp_env_io(env);
+ vio->u.fault.ft_vma = vma;
+ vio->u.fault.ft_vmpage = vmpage;
+
+ set = cfs_block_sigsinv(sigmask(SIGKILL) | sigmask(SIGTERM));
+
+ /* we grab lli_trunc_sem to exclude truncate case.
+ * Otherwise, we could add dirty pages into osc cache
+ * while truncate is on-going. */
+ inode = ccc_object_inode(io->ci_obj);
+ lli = ll_i2info(inode);
+ down_read(&lli->lli_trunc_sem);
+
+ result = cl_io_loop(env, io);
+
+ up_read(&lli->lli_trunc_sem);
+
+ cfs_restore_sigs(set);
+
+ if (result == 0) {
+ struct inode *inode = vma->vm_file->f_dentry->d_inode;
+ struct ll_inode_info *lli = ll_i2info(inode);
+
+ lock_page(vmpage);
+ if (vmpage->mapping == NULL) {
+ unlock_page(vmpage);
+
+ /* page was truncated and lock was cancelled, return
+ * ENODATA so that VM_FAULT_NOPAGE will be returned
+ * to handle_mm_fault(). */
+ if (result == 0)
+ result = -ENODATA;
+ } else if (!PageDirty(vmpage)) {
+ /* race, the page has been cleaned by ptlrpcd after
+ * it was unlocked, it has to be added into dirty
+ * cache again otherwise this soon-to-dirty page won't
+ * consume any grants, even worse if this page is being
+ * transferred because it will break RPC checksum.
+ */
+ unlock_page(vmpage);
+
+ CDEBUG(D_MMAP, "Race on page_mkwrite %p/%lu, page has "
+ "been written out, retry.\n",
+ vmpage, vmpage->index);
+
+ *retry = true;
+ result = -EAGAIN;
+ }
+
+ if (result == 0) {
+ spin_lock(&lli->lli_lock);
+ lli->lli_flags |= LLIF_DATA_MODIFIED;
+ spin_unlock(&lli->lli_lock);
+ }
+ }
+ EXIT;
+
+out:
+ cl_io_fini(env, io);
+ cl_env_nested_put(&nest, env);
+
+ CDEBUG(D_MMAP, "%s mkwrite with %d\n", cfs_current()->comm, result);
+
+ LASSERT(ergo(result == 0, PageLocked(vmpage)));
+ return(result);
}
+
#ifndef HAVE_VM_OP_FAULT
/**
* Lustre implementation of a vm_operations_struct::nopage() method, called by
unsigned long ra_flags;
pgoff_t pg_offset;
int result;
+ const unsigned long writable = VM_SHARED|VM_WRITE;
+ cfs_sigset_t set;
ENTRY;
- pg_offset = (address - vma->vm_start) >> PAGE_SHIFT;
- result = ll_fault_io_init(vma, &env, &nest, pg_offset, &ra_flags);
- if (env == NULL)
+ pg_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+ io = ll_fault_io_init(vma, &env, &nest, pg_offset, &ra_flags);
+ if (IS_ERR(io))
return NOPAGE_SIGBUS;
- io = &ccc_env_info(env)->cti_io;
+ result = io->ci_result;
if (result < 0)
goto out_err;
- vio = vvp_env_io(env);
+ io->u.ci_fault.ft_writable = (vma->vm_flags&writable) == writable;
+ vio = vvp_env_io(env);
vio->u.fault.ft_vma = vma;
vio->u.fault.nopage.ft_address = address;
vio->u.fault.nopage.ft_type = type;
+ vio->u.fault.ft_vmpage = NULL;
- result = cl_io_loop(env, io);
+ set = cfs_block_sigsinv(sigmask(SIGKILL)|sigmask(SIGTERM));
+ result = cl_io_loop(env, io);
+ cfs_restore_sigs(set);
+
+ page = vio->u.fault.ft_vmpage;
+ if (result != 0 && page != NULL) {
+ page_cache_release(page);
+ page = NOPAGE_SIGBUS;
+ }
out_err:
- if (result == 0) {
- LASSERT(io->u.ci_fault.ft_page != NULL);
- page = vio->u.fault.ft_vmpage;
- } else {
- if (result == -ENOMEM)
- page = NOPAGE_OOM;
- }
+ if (result == -ENOMEM)
+ page = NOPAGE_OOM;
vma->vm_flags &= ~VM_RAND_READ;
vma->vm_flags |= ra_flags;
RETURN(page);
}
+
#else
+
+static inline int to_fault_error(int result)
+{
+ switch(result) {
+ case 0:
+ result = VM_FAULT_LOCKED;
+ break;
+ case -EFAULT:
+ result = VM_FAULT_NOPAGE;
+ break;
+ case -ENOMEM:
+ result = VM_FAULT_OOM;
+ break;
+ default:
+ result = VM_FAULT_SIGBUS;
+ break;
+ }
+ return result;
+}
+
/**
* Lustre implementation of a vm_operations_struct::fault() method, called by
* VM to server page fault (both in kernel and user space).
* \retval VM_FAULT_ERROR on general error
* \retval NOPAGE_OOM not have memory for allocate new page
*/
-int ll_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+static int ll_fault0(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct lu_env *env;
struct cl_io *io;
struct vvp_io *vio = NULL;
+ struct page *vmpage;
unsigned long ra_flags;
struct cl_env_nest nest;
int result;
int fault_ret = 0;
ENTRY;
- result = ll_fault_io_init(vma, &env, &nest, vmf->pgoff, &ra_flags);
- if (env == NULL)
- RETURN(VM_FAULT_ERROR);
-
- io = &ccc_env_info(env)->cti_io;
- if (result < 0)
- goto out_err;
+ io = ll_fault_io_init(vma, &env, &nest, vmf->pgoff, &ra_flags);
+ if (IS_ERR(io))
+ RETURN(to_fault_error(PTR_ERR(io)));
+
+ result = io->ci_result;
+ if (result == 0) {
+ vio = vvp_env_io(env);
+ vio->u.fault.ft_vma = vma;
+ vio->u.fault.ft_vmpage = NULL;
+ vio->u.fault.fault.ft_vmf = vmf;
+
+ result = cl_io_loop(env, io);
+
+ fault_ret = vio->u.fault.fault.ft_flags;
+ vmpage = vio->u.fault.ft_vmpage;
+ if (result != 0 && vmpage != NULL) {
+ page_cache_release(vmpage);
+ vmf->page = NULL;
+ }
+ }
+ cl_io_fini(env, io);
+ cl_env_nested_put(&nest, env);
- vio = vvp_env_io(env);
+ vma->vm_flags |= ra_flags;
+ if (result != 0 && !(fault_ret & VM_FAULT_RETRY))
+ fault_ret |= to_fault_error(result);
- vio->u.fault.ft_vma = vma;
- vio->u.fault.fault.ft_vmf = vmf;
+ CDEBUG(D_MMAP, "%s fault %d/%d\n",
+ cfs_current()->comm, fault_ret, result);
+ RETURN(fault_ret);
+}
- result = cl_io_loop(env, io);
- fault_ret = vio->u.fault.fault.ft_flags;
+static int ll_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ int count = 0;
+ bool printed = false;
+ int result;
+ cfs_sigset_t set;
+
+ /* Only SIGKILL and SIGTERM is allowed for fault/nopage/mkwrite
+ * so that it can be killed by admin but not cause segfault by
+ * other signals. */
+ set = cfs_block_sigsinv(sigmask(SIGKILL) | sigmask(SIGTERM));
+
+restart:
+ result = ll_fault0(vma, vmf);
+ LASSERT(!(result & VM_FAULT_LOCKED));
+ if (result == 0) {
+ struct page *vmpage = vmf->page;
+
+ /* check if this page has been truncated */
+ lock_page(vmpage);
+ if (unlikely(vmpage->mapping == NULL)) { /* unlucky */
+ unlock_page(vmpage);
+ page_cache_release(vmpage);
+ vmf->page = NULL;
+
+ if (!printed && ++count > 16) {
+ CWARN("the page is under heavy contention,"
+ "maybe your app(%s) needs revising :-)\n",
+ current->comm);
+ printed = true;
+ }
+
+ goto restart;
+ }
-out_err:
- if (result != 0)
- fault_ret |= VM_FAULT_ERROR;
+ result |= VM_FAULT_LOCKED;
+ }
+ cfs_restore_sigs(set);
+ return result;
+}
+#endif
- vma->vm_flags |= ra_flags;
+#ifndef HAVE_PGMKWRITE_USE_VMFAULT
+static int ll_page_mkwrite(struct vm_area_struct *vma, struct page *vmpage)
+{
+ int count = 0;
+ bool printed = false;
+ bool retry;
+ int result;
+
+ do {
+ retry = false;
+ result = ll_page_mkwrite0(vma, vmpage, &retry);
+
+ if (!printed && ++count > 16) {
+ CWARN("app(%s): the page %lu of file %lu is under heavy"
+ " contention.\n",
+ current->comm, page_index(vmpage),
+ vma->vm_file->f_dentry->d_inode->i_ino);
+ printed = true;
+ }
+ } while (retry);
- cl_io_fini(env, io);
- cl_env_nested_put(&nest, env);
+ if (result == 0)
+ unlock_page(vmpage);
+ else if (result == -ENODATA)
+ result = 0; /* kernel will know truncate has happened and
+ * retry */
- RETURN(fault_ret);
+ return result;
}
+#else
+static int ll_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ int count = 0;
+ bool printed = false;
+ bool retry;
+ int result;
+
+ do {
+ retry = false;
+ result = ll_page_mkwrite0(vma, vmf->page, &retry);
+
+ if (!printed && ++count > 16) {
+ CWARN("app(%s): the page %lu of file %lu is under heavy"
+ " contention.\n",
+ current->comm, vmf->pgoff,
+ vma->vm_file->f_dentry->d_inode->i_ino);
+ printed = true;
+ }
+ } while (retry);
+
+ switch(result) {
+ case 0:
+ LASSERT(PageLocked(vmf->page));
+ result = VM_FAULT_LOCKED;
+ break;
+ case -ENODATA:
+ case -EFAULT:
+ result = VM_FAULT_NOPAGE;
+ break;
+ case -ENOMEM:
+ result = VM_FAULT_OOM;
+ break;
+ case -EAGAIN:
+ result = VM_FAULT_RETRY;
+ break;
+ default:
+ result = VM_FAULT_SIGBUS;
+ break;
+ }
+ return result;
+}
#endif
/**
static struct vm_operations_struct ll_file_vm_ops = {
#ifndef HAVE_VM_OP_FAULT
- .nopage = ll_nopage,
- .populate = ll_populate,
-
+ .nopage = ll_nopage,
+ .populate = ll_populate,
+#else
+ .fault = ll_fault,
+#endif
+#ifndef HAVE_PGMKWRITE_COMPACT
+ .page_mkwrite = ll_page_mkwrite,
#else
- .fault = ll_fault,
+ ._pmkw.page_mkwrite = ll_page_mkwrite,
#endif
- .open = ll_vm_open,
- .close = ll_vm_close,
+ .open = ll_vm_open,
+ .close = ll_vm_close,
};
int ll_file_mmap(struct file *file, struct vm_area_struct * vma)
vma->vm_ops = &ll_file_vm_ops;
vma->vm_ops->open(vma);
/* update the inode's size and mtime */
- rc = cl_glimpse_size(inode);
+ rc = ll_glimpse_size(inode);
}
RETURN(rc);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff