Andrew Morton <[email protected]> writes:
>> +/* 128kb is the whole sectors for FAT12 and FAT16 */
>> +#define FAT_READA_SIZE (128 * 1024)
>> +
>> +static void fat_ent_reada(struct super_block *sb, struct fat_entry *fatent,
>> + unsigned long reada_blocks)
>> +{
>> + struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
>> + sector_t blocknr;
>> + int i, offset;
>> +
>> + ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
>> +
>> + for (i = 0; i < reada_blocks; i++)
>> + sb_breadahead(sb, blocknr + i);
>> +}
>
> You might find that it's simpler and faster to call
> page_cache_sync_readahead() against sb->s_bdev->bd_inode->i_mapping.
>
> Or maybe not - that requires a struct file_ra_state. We _used_ to have a
> nice simple read-some-stuff-into-pagecache function which didn't need an
> ra_state but that seems to have disappeared in the various recent readahead
> churn. Oh well.
Yes. I found it, but I gave up for now by file_ra_state. Also I'd like
to use a large block to read FAT. I'll rethink this code after large
block was merged.
Thanks.
--
OGAWA Hirofumi <[email protected]>
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