Re: [LSF/MM TOPIC] Fixing large block devices on 32 bit

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 01/31/2014 11:02 AM, James Bottomley wrote:
>      3. Increase pgoff_t and the radix tree indexes to u64 for
>         CONFIG_LBDAF.  This will blow out the size of struct page on 32
>         bits by 4 bytes and may have other knock on effects, but at
>         least it will be transparent.

I'm not sure how many acrobatics we want to go through for 32-bit, but...

Between page->mapping and page->index, we have 64 bits of space, which
*should* be plenty to uniquely identify a block.  We could easily add a
second-level lookup somewhere so that we store some cookie for the
address_space instead of a direct pointer.  How many devices would need,
practically?  8 bits worth?
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux