Kathy KN wrote: > Good day all, > > How do I access/read the content of the files via using inodes > or blocks that belong to the inode, at sys_link and vfs_link layer? > I used bmap to access the blocks that belongs to the inodes, but > getting access to the buffer_head's b_data doesn't seem to help.
Hi Kathy - What you're trying to do is possible, but you need to go about it in a different way. Ignore the buffer cache completely and use the page cache; it's more appropriate for file contents. You have two options: If performance isn't critical, a simple approach would be to use your old_dentry pointer to dentry_open a file and then vfs_read from it to a buffer you allocate. Make sure you use get_fs/set_fs, since vfs_read won't accept a kernel pointer otherwise. If performance is more important or you really do only have access to an inode, you can read from the page cache directly using inode->i_mapping and read_cache_page. This has the advantage that you don't need to copy the data to access it, but the disadvantage that it is more complex and can be tricky to get right. -Jeff -- Jeff Mahoney SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
