[lkml]   [2010]   [Oct]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: introduce dm-snap-mv
On Fri, Oct 8, 2010 at 5:24 PM, Christoph Hellwig <> wrote:
> On Fri, Oct 08, 2010 at 05:14:27PM +0800, McPacino wrote:
>> Hi Christoph,
>> I have to take care the cache problem If using the bio directly.
>> BHs can be released by kernel when necessary.
>> Is there any existing code using bio to read/write metadata
>> blocks? How do they handle the timing freeing bios? I really
>> wish to learn something form it.
> If you actually need caching just use the pagecache, e.g.
> read_mapping_page to read in your data.  That completely abstracts
> away the underlying block size.

Hi Christoph,

My understanding is that, read_mapping_page_async() works in submit-wait
way. But whatI want is some function works in submit-callback way, just like
sumbit_bh(). Is there something like it in kernel?

cong meng.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2010-10-13 18:47    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean