4 * Copyright (C) 2005 IBM Corporation
5 * Author: Carsten Otte (cotte@de.ibm.com)
10 #include <linux/genhd.h>
11 #include <linux/buffer_head.h>
12 #include <linux/ext2_fs_sb.h>
13 #include <linux/ext2_fs.h>
18 __inode_direct_access(struct inode *inode, sector_t sector, unsigned long *data) {
19 BUG_ON(!inode->i_sb->s_bdev->bd_disk->fops->direct_access);
20 return inode->i_sb->s_bdev->bd_disk->fops
21 ->direct_access(inode->i_sb->s_bdev,sector,data);
25 ext2_clear_xip_target(struct inode *inode, int block) {
26 sector_t sector = block*(PAGE_SIZE/512);
30 rc = __inode_direct_access(inode, sector, &data);
33 clear_page((void*)data);
37 void ext2_xip_verify_sb(struct super_block *sb)
39 struct ext2_sb_info *sbi = EXT2_SB(sb);
41 if ((sbi->s_mount_opt & EXT2_MOUNT_XIP)) {
42 if ((sb->s_bdev == NULL) ||
43 sb->s_bdev->bd_disk == NULL ||
44 sb->s_bdev->bd_disk->fops == NULL ||
45 sb->s_bdev->bd_disk->fops->direct_access == NULL) {
46 sbi->s_mount_opt &= (~EXT2_MOUNT_XIP);
47 ext2_warning(sb, __FUNCTION__,
48 "ignoring xip option - not supported by bdev");
54 ext2_get_xip_page(struct address_space *mapping, sector_t blockno,
59 struct buffer_head tmp;
63 rc = ext2_get_block(mapping->host, blockno/(PAGE_SIZE/512) , &tmp,
67 if (tmp.b_blocknr == 0) {
70 return ERR_PTR(-ENODATA);
73 rc = __inode_direct_access
74 (mapping->host,tmp.b_blocknr*(PAGE_SIZE/512) ,&data);
78 SetPageUptodate(virt_to_page(data));
79 return virt_to_page(data);