Here is my latest patch:
http://ftp.espci.fr/shadow/manu/puffs-falloc.patch
The whole thing is not very satisfying. Here are a few issues:
- if we do not have fallocate and go the emulation way writing zeroes,
we must first call VOP_PUTPAGES for the whole vnode so that no data
remain in th cache
J. Hannken-Illjes wrote:
> Ok -- if you want to use it, you have to implement it on the client side
> as puffs has no idea how to allocate blocks -- right?
Here is my GOP_ALLOC so far. If available, use fallocate, otherwise
write zeroes. puffs_vnop_write() was split into puffs_vnop_write_cache()
On 02 Oct 2014, at 19:09, Emmanuel Dreyfus wrote:
> J. Hannken-Illjes wrote:
>
>> Please describe "cached write operation" in terms of vnode operations.
>
> A write on a mount that uses page cache, without direct I/O.
>
>> Which vnode operation finally calls GOP_ALLOC()?
>
> From genfs, onl
J. Hannken-Illjes wrote:
> Please describe "cached write operation" in terms of vnode operations.
A write on a mount that uses page cache, without direct I/O.
> Which vnode operation finally calls GOP_ALLOC()?
>From genfs, only VOP_GETPAGES, but I understand we should call it on our
own. For
On 02 Oct 2014, at 17:23, Emmanuel Dreyfus wrote:
> On Thu, Oct 02, 2014 at 12:02:39PM +0200, J. Hannken-Illjes wrote:
>> GOP_ALLOC() gets called from VOP_GETPAGES() for missing pages. Here you
>> run VOP_PUTPAGES() on a range known to be unmapped so it becomes a NOP.
>>
>> GOP_ALLOC() aka puff
On Thu, Oct 02, 2014 at 12:02:39PM +0200, J. Hannken-Illjes wrote:
> GOP_ALLOC() gets called from VOP_GETPAGES() for missing pages. Here you
> run VOP_PUTPAGES() on a range known to be unmapped so it becomes a NOP.
>
> GOP_ALLOC() aka puffs_gop_alloc() has to run on the client to make
> sure the
On 02 Oct 2014, at 06:45, Emmanuel Dreyfus wrote:
> J. Hannken-Illjes wrote:
>
>> genfs_gop_write calls genfs_do_io which does "error = biowait(mbp);"
>> near the end. This will catch errors from VOP_STRATEGY.
>
> I run the code below but VOP_PUTPAGES never return anything else than 0.
Sure
