mirror of
git://sourceware.org/git/lvm2.git
synced 2025-01-03 05:18:29 +03:00
126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/*
|
|
* dmfs-table.c
|
|
*
|
|
* Copyright (C) 2001 Sistina Software
|
|
*
|
|
* This software 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, or (at
|
|
* your option) any later version.
|
|
*
|
|
* This software 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 GNU CC; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/fs.h>
|
|
|
|
static int dmfs_release(struct inode *inode, struct file *f)
|
|
{
|
|
struct dm_table *table;
|
|
|
|
/* FIXME: we should lock the inode to
|
|
prevent someone else opening it while
|
|
we are parsing */
|
|
|
|
if (!(f->f_mode & S_IWUGO))
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int dmfs_readpage(struct file *file, struct page *page)
|
|
{
|
|
if (!PageUptodate(page)) {
|
|
memset(kmap(page), 0, PAGE_CACHE_SIZE);
|
|
kunmap(page);
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
}
|
|
UnlockPage(page);
|
|
return 0;
|
|
}
|
|
|
|
static int dmfs_writepage(struct page *page)
|
|
{
|
|
SetPageDirty(page);
|
|
UnlockPage(page);
|
|
return 0;
|
|
}
|
|
|
|
static int dmfs_prepare_write(struct file *file, struct page *page,
|
|
unsigned offset, unsigned to)
|
|
{
|
|
void *addr = kmap(page);
|
|
if (!Page_Uptodate(page)) {
|
|
memset(addr, 0, PAGE_CACHE_SIZE);
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
}
|
|
SetPageDirty(page);
|
|
return 0;
|
|
}
|
|
|
|
static int dmfs_commit_write(struct file *file, struct page *page,
|
|
unsigned offset, unsigned to)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
|
|
|
|
kunmap(page);
|
|
if (pos > inode->i_size)
|
|
inode->i_size = pos;
|
|
return 0;
|
|
}
|
|
|
|
static int dmfs_table_sync(struct file *file, struct dentry *dentry, int datasync)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct dm_table_address_space_operations = {
|
|
readpage: dmfs_readpage,
|
|
writepage: dmfs_writepage,
|
|
prepare_write: dmfs_prepare_write,
|
|
commit_write: dmfs_commit_write,
|
|
};
|
|
|
|
static struct dm_table_file_operations = {
|
|
llseek: generic_file_llseek,
|
|
read: generic_file_read,
|
|
write: generic_file_write,
|
|
mmap: generic_file_mmap,
|
|
fsync: dmfs_table_sync,
|
|
release: dmfs_release,
|
|
};
|
|
|
|
static struct dmfs_table_inode_operations = {
|
|
};
|
|
|
|
int dmfs_create_table(struct inode *dir, int mode)
|
|
{
|
|
struct inode *inode = new_inode(dir->i_sb);
|
|
|
|
if (inode) {
|
|
inode->i_mode = mode | S_IFREG;
|
|
inode->i_uid = current->fsuid;
|
|
inode->i_gid = current->fsgid;
|
|
inode->i_blksize = PAGE_CACHE_SIZE;
|
|
inode->i_blocks = 0;
|
|
inode->i_rdev = NODEV;
|
|
inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME;
|
|
inode->i_mapping->a_ops = &dmfs_table_address_space_operations;
|
|
inode->i_fop = &dmfs_table_file_operations;
|
|
inode->i_op = &dmfs_table_inode_operations;
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|