/*
* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Whamcloud, Inc.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#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);
{
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;
fio = &io->u.ci_fault;
fio->ft_index = index;
- fio->ft_writable = (vma->vm_flags&writable) == writable;
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 %d %d)\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);
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;
+ 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);
+
+ /* Don't enqueue new locks for page_mkwrite().
+ * If the lock has been cancelled then page must have been
+ * truncated, in that case, kernel will handle it.
+ */
+ io->ci_lockreq = CILR_PEEK;
+ 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;
+
+ result = cl_io_loop(env, io);
+
+ if (result == -ENODATA) /* peek failed, no lock caching. */
+ CDEBUG(D_MMAP, "race on page_mkwrite: %lx (%lu %p)\n",
+ vma->vm_flags, io->u.ci_fault.ft_index, vmpage);
+
+ if (result == 0 || result == -ENODATA) {
+ 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 (result == -ENODATA) {
+ /* Invalidate it if the cl_lock is being revoked.
+ * This piece of code is definitely needed for RHEL5,
+ * otherwise, SIGBUS will be wrongly returned to
+ * applications. */
+ write_one_page(vmpage, 1);
+ lock_page(vmpage);
+ if (vmpage->mapping != NULL) {
+ ll_invalidate_page(vmpage);
+ LASSERT(vmpage->mapping == NULL);
+ }
+ unlock_page(vmpage);
+ } 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;
+ }
+ }
+ 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;
ENTRY;
pg_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
if (result < 0)
goto out_err;
+ 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);
+ page = vio->u.fault.ft_vmpage;
+ if (result != 0 && page != NULL)
+ page_cache_release(page);
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
/**
* Lustre implementation of a vm_operations_struct::fault() method, called by
* \retval VM_FAULT_ERROR on general error
* \retval NOPAGE_OOM not have memory for allocate new page
*/
-int ll_fault0(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;
vio->u.fault.fault.ft_vmf = vmf;
result = cl_io_loop(env, io);
+
+ vmpage = vio->u.fault.ft_vmpage;
+ if (result != 0 && vmpage != NULL) {
+ page_cache_release(vmpage);
+ vmf->page = NULL;
+ }
+
fault_ret = vio->u.fault.fault.ft_flags;
out_err:
- if (result != 0)
- fault_ret |= VM_FAULT_ERROR;
+ if (result != 0 && fault_ret == 0)
+ fault_ret = VM_FAULT_ERROR;
vma->vm_flags |= ra_flags;
cl_io_fini(env, io);
cl_env_nested_put(&nest, env);
+ CDEBUG(D_MMAP, "%s fault %d/%d\n",
+ cfs_current()->comm, fault_ret, result);
RETURN(fault_ret);
}
-int ll_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+static int ll_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
int count = 0;
bool printed = false;
}
#endif
+#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);
+
+ if (result == 0)
+ unlock_page(vmpage);
+ else if (result == -ENODATA)
+ result = 0; /* kernel will know truncate has happened and
+ * retry */
+
+ 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
+
/**
* To avoid cancel the locks covering mmapped region for lock cache pressure,
* we track the mapped vma count in ccc_object::cob_mmap_cnt.
#else
.fault = ll_fault,
#endif
+ .page_mkwrite = ll_page_mkwrite,
.open = ll_vm_open,
.close = ll_vm_close,
};
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