diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/mmap.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/mmap.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/mmap.c b/ANDROID_3.4.5/fs/ocfs2/mmap.c deleted file mode 100644 index 9cd41083..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/mmap.c +++ /dev/null @@ -1,192 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * mmap.c - * - * Code to deal with the mess that is clustered mmap. - * - * Copyright (C) 2002, 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#include <linux/fs.h> -#include <linux/types.h> -#include <linux/highmem.h> -#include <linux/pagemap.h> -#include <linux/uio.h> -#include <linux/signal.h> -#include <linux/rbtree.h> - -#include <cluster/masklog.h> - -#include "ocfs2.h" - -#include "aops.h" -#include "dlmglue.h" -#include "file.h" -#include "inode.h" -#include "mmap.h" -#include "super.h" -#include "ocfs2_trace.h" - - -static int ocfs2_fault(struct vm_area_struct *area, struct vm_fault *vmf) -{ - sigset_t oldset; - int ret; - - ocfs2_block_signals(&oldset); - ret = filemap_fault(area, vmf); - ocfs2_unblock_signals(&oldset); - - trace_ocfs2_fault(OCFS2_I(area->vm_file->f_mapping->host)->ip_blkno, - area, vmf->page, vmf->pgoff); - return ret; -} - -static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh, - struct page *page) -{ - int ret = VM_FAULT_NOPAGE; - struct inode *inode = file->f_path.dentry->d_inode; - struct address_space *mapping = inode->i_mapping; - loff_t pos = page_offset(page); - unsigned int len = PAGE_CACHE_SIZE; - pgoff_t last_index; - struct page *locked_page = NULL; - void *fsdata; - loff_t size = i_size_read(inode); - - last_index = (size - 1) >> PAGE_CACHE_SHIFT; - - /* - * There are cases that lead to the page no longer bebongs to the - * mapping. - * 1) pagecache truncates locally due to memory pressure. - * 2) pagecache truncates when another is taking EX lock against - * inode lock. see ocfs2_data_convert_worker. - * - * The i_size check doesn't catch the case where nodes truncated and - * then re-extended the file. We'll re-check the page mapping after - * taking the page lock inside of ocfs2_write_begin_nolock(). - * - * Let VM retry with these cases. - */ - if ((page->mapping != inode->i_mapping) || - (!PageUptodate(page)) || - (page_offset(page) >= size)) - goto out; - - /* - * Call ocfs2_write_begin() and ocfs2_write_end() to take - * advantage of the allocation code there. We pass a write - * length of the whole page (chopped to i_size) to make sure - * the whole thing is allocated. - * - * Since we know the page is up to date, we don't have to - * worry about ocfs2_write_begin() skipping some buffer reads - * because the "write" would invalidate their data. - */ - if (page->index == last_index) - len = ((size - 1) & ~PAGE_CACHE_MASK) + 1; - - ret = ocfs2_write_begin_nolock(file, mapping, pos, len, 0, &locked_page, - &fsdata, di_bh, page); - if (ret) { - if (ret != -ENOSPC) - mlog_errno(ret); - if (ret == -ENOMEM) - ret = VM_FAULT_OOM; - else - ret = VM_FAULT_SIGBUS; - goto out; - } - - if (!locked_page) { - ret = VM_FAULT_NOPAGE; - goto out; - } - ret = ocfs2_write_end_nolock(mapping, pos, len, len, locked_page, - fsdata); - BUG_ON(ret != len); - ret = VM_FAULT_LOCKED; -out: - return ret; -} - -static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) -{ - struct page *page = vmf->page; - struct inode *inode = vma->vm_file->f_path.dentry->d_inode; - struct buffer_head *di_bh = NULL; - sigset_t oldset; - int ret; - - ocfs2_block_signals(&oldset); - - /* - * The cluster locks taken will block a truncate from another - * node. Taking the data lock will also ensure that we don't - * attempt page truncation as part of a downconvert. - */ - ret = ocfs2_inode_lock(inode, &di_bh, 1); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - /* - * The alloc sem should be enough to serialize with - * ocfs2_truncate_file() changing i_size as well as any thread - * modifying the inode btree. - */ - down_write(&OCFS2_I(inode)->ip_alloc_sem); - - ret = __ocfs2_page_mkwrite(vma->vm_file, di_bh, page); - - up_write(&OCFS2_I(inode)->ip_alloc_sem); - - brelse(di_bh); - ocfs2_inode_unlock(inode, 1); - -out: - ocfs2_unblock_signals(&oldset); - return ret; -} - -static const struct vm_operations_struct ocfs2_file_vm_ops = { - .fault = ocfs2_fault, - .page_mkwrite = ocfs2_page_mkwrite, -}; - -int ocfs2_mmap(struct file *file, struct vm_area_struct *vma) -{ - int ret = 0, lock_level = 0; - - ret = ocfs2_inode_lock_atime(file->f_dentry->d_inode, - file->f_vfsmnt, &lock_level); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - ocfs2_inode_unlock(file->f_dentry->d_inode, lock_level); -out: - vma->vm_ops = &ocfs2_file_vm_ops; - vma->vm_flags |= VM_CAN_NONLINEAR; - return 0; -} - |