![Konstantin Khlebnikov](/assets/img/avatar_default.png)
Move actual pte filling for non-linear file mappings into the new special vma operation: ->remap_pages(). Filesystems must implement this method to get non-linear mapping support, if it uses filemap_fault() then generic_file_remap_pages() can be used. Now device drivers can implement this method and obtain nonlinear vma support. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Carsten Otte <cotte@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> #arch/tile Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Eric Paris <eparis@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morris <james.l.morris@oracle.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Kentaro Takeda <takedakn@nttdata.co.jp> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Venkatesh Pallipadi <venki@google.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
177 lines
4.6 KiB
C
177 lines
4.6 KiB
C
/*
|
|
* file.c - NILFS regular file handling primitives including fsync().
|
|
*
|
|
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Written by Amagai Yoshiji <amagai@osrg.net>,
|
|
* Ryusuke Konishi <ryusuke@osrg.net>
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/writeback.h>
|
|
#include "nilfs.h"
|
|
#include "segment.h"
|
|
|
|
int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
|
|
/*
|
|
* Called from fsync() system call
|
|
* This is the only entry point that can catch write and synch
|
|
* timing for both data blocks and intermediate blocks.
|
|
*
|
|
* This function should be implemented when the writeback function
|
|
* will be implemented.
|
|
*/
|
|
struct the_nilfs *nilfs;
|
|
struct inode *inode = file->f_mapping->host;
|
|
int err;
|
|
|
|
err = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (err)
|
|
return err;
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
if (nilfs_inode_dirty(inode)) {
|
|
if (datasync)
|
|
err = nilfs_construct_dsync_segment(inode->i_sb, inode,
|
|
0, LLONG_MAX);
|
|
else
|
|
err = nilfs_construct_segment(inode->i_sb);
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
nilfs = inode->i_sb->s_fs_info;
|
|
if (!err && nilfs_test_opt(nilfs, BARRIER)) {
|
|
err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
|
|
if (err != -EIO)
|
|
err = 0;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct page *page = vmf->page;
|
|
struct inode *inode = vma->vm_file->f_dentry->d_inode;
|
|
struct nilfs_transaction_info ti;
|
|
int ret = 0;
|
|
|
|
if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
|
|
return VM_FAULT_SIGBUS; /* -ENOSPC */
|
|
|
|
sb_start_pagefault(inode->i_sb);
|
|
lock_page(page);
|
|
if (page->mapping != inode->i_mapping ||
|
|
page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
|
|
unlock_page(page);
|
|
ret = -EFAULT; /* make the VM retry the fault */
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* check to see if the page is mapped already (no holes)
|
|
*/
|
|
if (PageMappedToDisk(page))
|
|
goto mapped;
|
|
|
|
if (page_has_buffers(page)) {
|
|
struct buffer_head *bh, *head;
|
|
int fully_mapped = 1;
|
|
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
if (!buffer_mapped(bh)) {
|
|
fully_mapped = 0;
|
|
break;
|
|
}
|
|
} while (bh = bh->b_this_page, bh != head);
|
|
|
|
if (fully_mapped) {
|
|
SetPageMappedToDisk(page);
|
|
goto mapped;
|
|
}
|
|
}
|
|
unlock_page(page);
|
|
|
|
/*
|
|
* fill hole blocks
|
|
*/
|
|
ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
|
|
/* never returns -ENOMEM, but may return -ENOSPC */
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
file_update_time(vma->vm_file);
|
|
ret = __block_page_mkwrite(vma, vmf, nilfs_get_block);
|
|
if (ret) {
|
|
nilfs_transaction_abort(inode->i_sb);
|
|
goto out;
|
|
}
|
|
nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
|
|
nilfs_transaction_commit(inode->i_sb);
|
|
|
|
mapped:
|
|
wait_on_page_writeback(page);
|
|
out:
|
|
sb_end_pagefault(inode->i_sb);
|
|
return block_page_mkwrite_return(ret);
|
|
}
|
|
|
|
static const struct vm_operations_struct nilfs_file_vm_ops = {
|
|
.fault = filemap_fault,
|
|
.page_mkwrite = nilfs_page_mkwrite,
|
|
.remap_pages = generic_file_remap_pages,
|
|
};
|
|
|
|
static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
file_accessed(file);
|
|
vma->vm_ops = &nilfs_file_vm_ops;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We have mostly NULL's here: the current defaults are ok for
|
|
* the nilfs filesystem.
|
|
*/
|
|
const struct file_operations nilfs_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.aio_read = generic_file_aio_read,
|
|
.aio_write = generic_file_aio_write,
|
|
.unlocked_ioctl = nilfs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = nilfs_compat_ioctl,
|
|
#endif /* CONFIG_COMPAT */
|
|
.mmap = nilfs_file_mmap,
|
|
.open = generic_file_open,
|
|
/* .release = nilfs_release_file, */
|
|
.fsync = nilfs_sync_file,
|
|
.splice_read = generic_file_splice_read,
|
|
};
|
|
|
|
const struct inode_operations nilfs_file_inode_operations = {
|
|
.truncate = nilfs_truncate,
|
|
.setattr = nilfs_setattr,
|
|
.permission = nilfs_permission,
|
|
.fiemap = nilfs_fiemap,
|
|
};
|
|
|
|
/* end of file */
|