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,
19 void **kaddr, unsigned long *pfn)
21 struct block_device *bdev = inode->i_sb->s_bdev;
22 struct block_device_operations *ops = bdev->bd_disk->fops;
24 BUG_ON(!ops->direct_access);
25 return ops->direct_access(bdev, sector, kaddr, pfn);
29 __ext2_get_sector(struct inode *inode, sector_t offset, int create,
32 struct buffer_head tmp;
35 memset(&tmp, 0, sizeof(struct buffer_head));
36 rc = ext2_get_block(inode, offset/ (PAGE_SIZE/512), &tmp,
38 *result = tmp.b_blocknr;
40 /* did we get a sparse block (hole in the file)? */
41 if (!tmp.b_blocknr && !rc) {
50 ext2_clear_xip_target(struct inode *inode, int block)
52 sector_t sector = block * (PAGE_SIZE/512);
57 rc = __inode_direct_access(inode, sector, &kaddr, &pfn);
63 void ext2_xip_verify_sb(struct super_block *sb)
65 struct ext2_sb_info *sbi = EXT2_SB(sb);
67 if ((sbi->s_mount_opt & EXT2_MOUNT_XIP) &&
68 !sb->s_bdev->bd_disk->fops->direct_access) {
69 sbi->s_mount_opt &= (~EXT2_MOUNT_XIP);
70 ext2_warning(sb, __FUNCTION__,
71 "ignoring xip option - not supported by bdev");
76 ext2_get_xip_page(struct address_space *mapping, sector_t offset,
84 /* first, retrieve the sector number */
85 rc = __ext2_get_sector(mapping->host, offset, create, §or);
89 /* retrieve address of the target data */
90 rc = __inode_direct_access
91 (mapping->host, sector * (PAGE_SIZE/512), &kaddr, &pfn);
93 return pfn_to_page(pfn);