On Mon, Mar 05, 2007 at 12:02:59PM -0800, Mingming Cao wrote:
> Yep, I think it makes sense to use preallocation for defragmentation.
> After all both preallocation and defragmentation shall call underlying
> filesystem multiple block allocator to try to allocate a chunk of
> contiguous blocks on
Jörn Engel wrote:
> Does the allocation have to be persistent beyond lifetime of the file
> descriptor? It would be fairly simple to support the write guarantee
> while the file is open (or rather the inode remains cached) and drop it
> afterwards.
"The posix_fallocate() function shall ensure tha
Jan Kara wrote:
>> I am wondering if it is useful to add another mode to advise block
>> allocation policy? Something like indicating which physical block/block
>> group to allocate from (goal), and whether ask for strict contigous
>> blocks. This will help preallocation or reservation to choos
Jan Kara wrote:
On Fri, 02 Mar 2007 09:40:54 +1100
Nathan Scott <[EMAIL PROTECTED]> wrote:
On Thu, 2007-03-01 at 14:25 -0800, Andrew Morton wrote:
On Fri, 2 Mar 2007 00:04:45 +0530
"Amit K. Arora" <[EMAIL PROTECTED]> wrote:
This is to give a heads up on few patches that we will be soon
Hello listers,
I'm tutor on the Faculty ICT, department NID. This is a bachelor degree
and we are preparing our students to become something more then just
System Administrators (such as manager, consulting, etc). Since this
department is part of the Microsoft camp, the students are educated
m
Theodore Tso wrote:
> [...] although the libc
> implementation still wouldn't be able to go away for long time due to
> the need to be backwards compatible with older kernels that didn't
> have this support.
It's better than that. If somebody compiles glibc to not run on older
kernels at all (tes
On Mon, Mar 05, 2007 at 07:15:33AM -0800, Ulrich Drepper wrote:
> Well, I'm sure the kernel can do better than the code we have in libc
> now. The kernel has access to the bitmasks which say which blocks have
> already been allocated. The libc code does not and we have to be very
> simple-minded
Jörn Engel wrote:
>> Of course. You call posix_fallocate once for the lifetime of the file
>> when it is created to ensure that all future uses will work.
>
> That part is not quite clear from the manpage but I trust most people
> would assume the same.
Not only that, it is what this function is
On Mon, 5 March 2007 07:08:03 -0800, Ulrich Drepper wrote:
> Jörn Engel wrote:
> > Does the allocation have to be persistent beyond lifetime of the file
> > descriptor?
>
> Of course. You call posix_fallocate once for the lifetime of the file
> when it is created to ensure that all future uses wi
On Mon, Mar 05, 2007 at 07:15:33AM -0800, Ulrich Drepper wrote:
> Theodore Tso wrote:
> > Given that glibc already has to support this for older kernels, I
> > would argue that there's no point putting in generic support for
> > filesystem that can't support a more advanced way of doing things.
>
Jörn Engel wrote:
> The bad news for posix_fallocate() is that even if libc is smart enough
> to write random data, mmap() can still cause problems.
This is not smart, quite to the contrary. The standard guarantees that
all not-yet-written-to places in the file are zero. And if a block has
alrea
Jörn Engel wrote:
> Does the allocation have to be persistent beyond lifetime of the file
> descriptor?
Of course. You call posix_fallocate once for the lifetime of the file
when it is created to ensure that all future uses will work.
It seems your filesystem will not be able to support this unl
Theodore Tso wrote:
> Given that glibc already has to support this for older kernels, I
> would argue that there's no point putting in generic support for
> filesystem that can't support a more advanced way of doing things.
Well, I'm sure the kernel can do better than the code we have in libc
now.
On 5 Mar 2007, at 14:37, Theodore Tso wrote:
On Sun, Mar 04, 2007 at 11:22:06PM +, Anton Altaparmakov wrote:
And I specifically did NOT update the initialized size in the inode
thus it will remain at its old value thus all new allocated blocks
will be considered as present but not initialize
On Sun, Mar 04, 2007 at 11:22:06PM +, Anton Altaparmakov wrote:
> And I specifically did NOT update the initialized size in the inode
> thus it will remain at its old value thus all new allocated blocks
> will be considered as present but not initialized thus a read will
> always return z
On Mon, 5 March 2007 00:32:14 +, Anton Altaparmakov wrote:
>
> I don't know how your compression algorithm works [...]
LogFS is designed for flash media, so it does not have to worry much
about reducing disk seeks. It is log-structured, which simplifies
compression further.
When writing a b
On Sat, Mar 03, 2007 at 11:45:32PM +0100, Arnd Bergmann wrote:
> > I'd be more happy to have the write out zeroes loop in glibc. ?And
> > glibc needs to have it anyway, for older kernels.
>
> A generic_fallocate makes sense to me iff we can do it in the kernel
> more significantly more efficiently
On Mon, 5 March 2007 01:36:36 +0100, Arnd Bergmann wrote:
>
> Using the current glibc implementation on a compressed file system ideally
> should be a very expensive no-op because you won't actually allocate much
> space for a file when writing zeroes to it. You also don't benefit of a
> contiguou
> >On Fri, 02 Mar 2007 09:40:54 +1100
> >Nathan Scott <[EMAIL PROTECTED]> wrote:
> >
> >
> >>On Thu, 2007-03-01 at 14:25 -0800, Andrew Morton wrote:
> >>
> >>>On Fri, 2 Mar 2007 00:04:45 +0530
> >>>"Amit K. Arora" <[EMAIL PROTECTED]> wrote:
> >>>
> >>>
> This is to give a heads up on few patche
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