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@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?
Hi, Pekka, Systemd needs it, see http://lkml.org/lkml/2011/10/20/275. I am adding Kay into Cc. Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>