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>
14 #include <linux/blkdev.h>
19 __inode_direct_access(struct inode *inode, sector_t block,
20 void **kaddr, unsigned long *pfn)
22 struct block_device *bdev = inode->i_sb->s_bdev;
23 const struct block_device_operations *ops = bdev->bd_disk->fops;
26 sector = block * (PAGE_SIZE / 512); /* ext2 block to bdev sector */
28 BUG_ON(!ops->direct_access);
29 return ops->direct_access(bdev, sector, kaddr, pfn);
33 __ext2_get_block(struct inode *inode, pgoff_t pgoff, int create,
36 struct buffer_head tmp;
39 memset(&tmp, 0, sizeof(struct buffer_head));
40 tmp.b_size = 1 << inode->i_blkbits;
41 rc = ext2_get_block(inode, pgoff, &tmp, create);
42 *result = tmp.b_blocknr;
44 /* did we get a sparse block (hole in the file)? */
45 if (!tmp.b_blocknr && !rc) {
54 ext2_clear_xip_target(struct inode *inode, sector_t block)
60 rc = __inode_direct_access(inode, block, &kaddr, &pfn);
66 void ext2_xip_verify_sb(struct super_block *sb)
68 struct ext2_sb_info *sbi = EXT2_SB(sb);
70 if ((sbi->s_mount_opt & EXT2_MOUNT_XIP) &&
71 !sb->s_bdev->bd_disk->fops->direct_access) {
72 sbi->s_mount_opt &= (~EXT2_MOUNT_XIP);
73 ext2_msg(sb, KERN_WARNING,
74 "warning: ignoring xip option - "
75 "not supported by bdev");
79 int ext2_get_xip_mem(struct address_space *mapping, pgoff_t pgoff, int create,
80 void **kmem, unsigned long *pfn)
85 /* first, retrieve the sector number */
86 rc = __ext2_get_block(mapping->host, pgoff, create, &block);
90 /* retrieve address of the target data */
91 rc = __inode_direct_access(mapping->host, block, kmem, pfn);