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SubjectRe: [PATCH v5] blk-cgroup:be able to remove the record of unplugged device
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On Wed, 2011-07-27 at 10:11 -0400, Vivek Goyal wrote:
> On Wed, Jul 27, 2011 at 08:11:48AM +0800, Wanlong Gao wrote:
> > The bug is we're not able to remove the device from blkio cgroup's
> > per-device control files if it gets unplugged.
> >
> > To reproduce the bug:
> >
> > # mount -t cgroup -o blkio xxx /cgroup
> > # cd /cgroup
> > # echo "8:0 1000" > blkio.throttle.read_bps_device
> > # unplug the device
> > # cat blkio.throttle.read_bps_device
> > 8:0 1000
> > # echo "8:0 0" > blkio.throttle.read_bps_device
> > -bash: echo: write error: No such device
> >
> > After patching, the device removal will succeed.
> >
> > Thanks for the comments of Paul, Zefan, and Vivek.
> >
> > Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
>
> Thanks. This looks good to me.
>
> Acked-by: Vivek Goyal <vgoyal@redhat.com>
>
> Vivek
>
> > ---
> > block/blk-cgroup.c | 37 ++++++++++++++++---------------------
> > 1 files changed, 16 insertions(+), 21 deletions(-)
> >
> > diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
> > index bcaf16e..b596e54 100644
> > --- a/block/blk-cgroup.c
> > +++ b/block/blk-cgroup.c
> > @@ -785,10 +785,10 @@ static int blkio_policy_parse_and_set(char *buf,
> > {
> > char *s[4], *p, *major_s = NULL, *minor_s = NULL;
> > int ret;
> > - unsigned long major, minor, temp;
> > + unsigned long major, minor;
> > int i = 0;
> > dev_t dev;
> > - u64 bps, iops;
> > + u64 temp;
> >
> > memset(s, 0, sizeof(s));
> >
> > @@ -826,20 +826,23 @@ static int blkio_policy_parse_and_set(char *buf,
> >
> > dev = MKDEV(major, minor);
> >
> > - ret = blkio_check_dev_num(dev);
> > + ret = strict_strtoull(s[1], 10, &temp);
> > if (ret)
> > - return ret;
> > + return -EINVAL;
> >
> > - newpn->dev = dev;
> > + /* For rule removal, do not check for device presence. */
> > + if (temp) {
> > + ret = blkio_check_dev_num(dev);
> > + if (ret)
> > + return ret;
> > + }
> >
> > - if (s[1] == NULL)
> > - return -EINVAL;
> > + newpn->dev = dev;
> >
> > switch (plid) {
> > case BLKIO_POLICY_PROP:
> > - ret = strict_strtoul(s[1], 10, &temp);
> > - if (ret || (temp < BLKIO_WEIGHT_MIN && temp > 0) ||
> > - temp > BLKIO_WEIGHT_MAX)
> > + if ((temp < BLKIO_WEIGHT_MIN && temp > 0) ||
> > + temp > BLKIO_WEIGHT_MAX)
> > return -EINVAL;
> >
> > newpn->plid = plid;
> > @@ -850,26 +853,18 @@ static int blkio_policy_parse_and_set(char *buf,
> > switch(fileid) {
> > case BLKIO_THROTL_read_bps_device:
> > case BLKIO_THROTL_write_bps_device:
> > - ret = strict_strtoull(s[1], 10, &bps);
> > - if (ret)
> > - return -EINVAL;
> > -
> > newpn->plid = plid;
> > newpn->fileid = fileid;
> > - newpn->val.bps = bps;
> > + newpn->val.bps = temp;
> > break;
> > case BLKIO_THROTL_read_iops_device:
> > case BLKIO_THROTL_write_iops_device:
> > - ret = strict_strtoull(s[1], 10, &iops);
> > - if (ret)
> > - return -EINVAL;
> > -
> > - if (iops > THROTL_IOPS_MAX)
> > + if (temp > THROTL_IOPS_MAX)
> > return -EINVAL;
> >
> > newpn->plid = plid;
> > newpn->fileid = fileid;
> > - newpn->val.iops = (unsigned int)iops;
> > + newpn->val.iops = (unsigned int)temp;
> > break;
> > }
> > break;
> > --
> > 1.7.6

How about this? For a long time.

Thanks
Wanlong Gao



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