Hello,
On Tue, Nov 15, 2011 at 10:42 AM, Amerigo Wang <amwang@xxxxxxxxxx> 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@xxxxxxxxxx>
What's the use case for this?
Pekka
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