On Mon, Jan 14, 2013 at 10:18:30PM +0800, Zheng Liu wrote:
> +static errcode_t ext2fs_file_llseek_data(ext2_file_t file, __u64 offset)
> +{
> + int ret_flags, flag = 1;
> + ext2_filsys fs = file->fs;
> + errcode_t retval;
> +
> + /*
> + * If offset == EXT2_SEEK_OFFSET_INVALID, that means that
> + * the caller wants to find the data from file->pos.
> + */
> + offset = offset != EXT2_SEEK_OFFSET_INVALID ? offset : file->pos;
> + file->blockno = offset / fs->blocksize;
> + while (file->blockno * fs->blocksize < EXT2_I_SIZE(&file->inode)) {
> + retval = ext2fs_bmap2(fs, file->ino, &file->inode,
> + BMAP_BUFFER, 0, file->blockno,
> + &ret_flags, &file->physblock);
Using bmap will certainly work, although as an optimization we can do
much better for extents if we use the extents interface. I won't
insist on this, though. (We can always optimize this later).
- Ted
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