Messages in this thread | | | Date | Wed, 16 Nov 2011 15:09:52 +0800 | From | Cong Wang <> | Subject | Re: [Patch] tmpfs: add fallocate support |
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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.
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