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SubjectRe: [Patch] tmpfs: add fallocate support
于 2011年11月15日 19:23, Pekka Enberg 写道:
> Hello,
>
> On Tue, Nov 15, 2011 at 10:42 AM, Amerigo Wang<amwang@redhat.com> wrote:
>> This patch adds fallocate support to tmpfs. I tested this patch
>> with the following test case,
>>
>> % sudo mount -t tmpfs -o size=100 tmpfs /mnt
>> % touch /mnt/foobar
>> % echo hi> /mnt/foobar
>> % fallocate -o 3 -l 5000 /mnt/foobar
>> fallocate: /mnt/foobar: fallocate failed: No space left on device
>> % fallocate -o 3 -l 3000 /mnt/foobar
>> % ls -l /mnt/foobar
>> -rw-rw-r-- 1 wangcong wangcong 3003 Nov 15 16:10 /mnt/foobar
>> % dd if=/dev/zero of=/mnt/foobar seek=3 bs=1 count=3000
>> 3000+0 records in
>> 3000+0 records out
>> 3000 bytes (3.0 kB) copied, 0.0153224 s, 196 kB/s
>> % hexdump -C /mnt/foobar
>> 00000000 68 69 0a 00 00 00 00 00 00 00 00 00 00 00 00 00 |hi..............|
>> 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
>> *
>> 00000bb0 00 00 00 00 00 00 00 00 00 00 00 |...........|
>> 00000bbb
>> % cat /mnt/foobar
>> hi
>>
>> Signed-off-by: WANG Cong<amwang@redhat.com>
>
> What's the use case for this?
>

Hi, Pekka,

Systemd needs it, see http://lkml.org/lkml/2011/10/20/275.
I am adding Kay into Cc.

Thanks.
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