diff options
author | Carsten Otte <cotte@de.ibm.com> | 2005-06-23 22:05:26 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-24 00:06:41 -0700 |
commit | 6d79125bba55ee82701f1c7d4ebbc1aa20ecbe4e (patch) | |
tree | fbd7f82fea19fd89e09312fe89919774b94a6efe /fs/ext2/xip.c | |
parent | ceffc078528befc008c6f2c2c4decda79eabd534 (diff) | |
download | kernel_samsung_tuna-6d79125bba55ee82701f1c7d4ebbc1aa20ecbe4e.zip kernel_samsung_tuna-6d79125bba55ee82701f1c7d4ebbc1aa20ecbe4e.tar.gz kernel_samsung_tuna-6d79125bba55ee82701f1c7d4ebbc1aa20ecbe4e.tar.bz2 |
[PATCH] xip: ext2: execute in place
These are the ext2 related parts. Ext2 now uses the xip_* file operations
along with the get_xip_page aop when mounted with -o xip.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/ext2/xip.c')
-rw-r--r-- | fs/ext2/xip.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/fs/ext2/xip.c b/fs/ext2/xip.c new file mode 100644 index 0000000..d44431d --- /dev/null +++ b/fs/ext2/xip.c @@ -0,0 +1,80 @@ +/* + * linux/fs/ext2/xip.c + * + * Copyright (C) 2005 IBM Corporation + * Author: Carsten Otte (cotte@de.ibm.com) + */ + +#include <linux/mm.h> +#include <linux/fs.h> +#include <linux/genhd.h> +#include <linux/buffer_head.h> +#include <linux/ext2_fs_sb.h> +#include <linux/ext2_fs.h> +#include "ext2.h" +#include "xip.h" + +static inline int +__inode_direct_access(struct inode *inode, sector_t sector, unsigned long *data) { + BUG_ON(!inode->i_sb->s_bdev->bd_disk->fops->direct_access); + return inode->i_sb->s_bdev->bd_disk->fops + ->direct_access(inode->i_sb->s_bdev,sector,data); +} + +int +ext2_clear_xip_target(struct inode *inode, int block) { + sector_t sector = block*(PAGE_SIZE/512); + unsigned long data; + int rc; + + rc = __inode_direct_access(inode, sector, &data); + if (rc) + return rc; + clear_page((void*)data); + return 0; +} + +void ext2_xip_verify_sb(struct super_block *sb) +{ + struct ext2_sb_info *sbi = EXT2_SB(sb); + + if ((sbi->s_mount_opt & EXT2_MOUNT_XIP)) { + if ((sb->s_bdev == NULL) || + sb->s_bdev->bd_disk == NULL || + sb->s_bdev->bd_disk->fops == NULL || + sb->s_bdev->bd_disk->fops->direct_access == NULL) { + sbi->s_mount_opt &= (~EXT2_MOUNT_XIP); + ext2_warning(sb, __FUNCTION__, + "ignoring xip option - not supported by bdev"); + } + } +} + +struct page* +ext2_get_xip_page(struct address_space *mapping, sector_t blockno, + int create) +{ + int rc; + unsigned long data; + struct buffer_head tmp; + + tmp.b_state = 0; + tmp.b_blocknr = 0; + rc = ext2_get_block(mapping->host, blockno/(PAGE_SIZE/512) , &tmp, + create); + if (rc) + return ERR_PTR(rc); + if (tmp.b_blocknr == 0) { + /* SPARSE block */ + BUG_ON(create); + return ERR_PTR(-ENODATA); + } + + rc = __inode_direct_access + (mapping->host,tmp.b_blocknr*(PAGE_SIZE/512) ,&data); + if (rc) + return ERR_PTR(rc); + + SetPageUptodate(virt_to_page(data)); + return virt_to_page(data); +} |