ao? 2011a1'11ae??15ae?JPY 19:23, Pekka Enberg a??e??:

Hello,

On Tue, Nov 15, 2011 at 10:42 AM, Amerigo Wang[off-list ref]  wrote:

quoted

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<redacted>

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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