[for-2.7,v2,06/17] gluster: Implement .bdrv_lockf

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/gluster.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

On Fri, Apr 15, 2016 at 11:27:56AM +0800, Fam Zheng wrote:
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  block/gluster.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)

The Gluster changes look good to me.

Reviewed-by: Niels de Vos <ndevos@redhat.com>

> 
> diff --git a/block/gluster.c b/block/gluster.c
> index 51e154c..c23e944 100644
> --- a/block/gluster.c
> +++ b/block/gluster.c
> @@ -672,6 +672,32 @@ static void qemu_gluster_close(BlockDriverState *bs)
>      glfs_fini(s->glfs);
>  }
>  
> +static int qemu_gluster_lockf(BlockDriverState *bs, BdrvLockfCmd cmd)
> +{
> +    BDRVGlusterState *s = bs->opaque;
> +    int ret;
> +    struct flock fl = (struct flock) {
> +        .l_start = 0,
> +        .l_whence  = SEEK_SET,
> +        .l_len = 0,
> +    };
> +    switch (cmd) {
> +    case BDRV_LOCKF_RWLOCK:
> +        fl.l_type = F_WRLCK;
> +        break;
> +    case BDRV_LOCKF_ROLOCK:
> +        fl.l_type = F_RDLCK;
> +        break;
> +    case BDRV_LOCKF_UNLOCK:
> +        fl.l_type = F_UNLCK;
> +        break;
> +    default:
> +        abort();
> +    }
> +    ret = glfs_posix_lock(s->fd, F_SETLK, &fl);
> +    return ret == -1 ? -errno : 0;
> +}
> +
>  static int qemu_gluster_has_zero_init(BlockDriverState *bs)
>  {
>      /* GlusterFS volume could be backed by a block device */
> @@ -713,6 +739,7 @@ static BlockDriver bdrv_gluster = {
>      .bdrv_co_readv                = qemu_gluster_co_readv,
>      .bdrv_co_writev               = qemu_gluster_co_writev,
>      .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
> +    .bdrv_lockf                   = qemu_gluster_lockf,
>      .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
>  #ifdef CONFIG_GLUSTERFS_DISCARD
>      .bdrv_co_discard              = qemu_gluster_co_discard,
> @@ -740,6 +767,7 @@ static BlockDriver bdrv_gluster_tcp = {
>      .bdrv_co_readv                = qemu_gluster_co_readv,
>      .bdrv_co_writev               = qemu_gluster_co_writev,
>      .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
> +    .bdrv_lockf                   = qemu_gluster_lockf,
>      .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
>  #ifdef CONFIG_GLUSTERFS_DISCARD
>      .bdrv_co_discard              = qemu_gluster_co_discard,
> @@ -767,6 +795,7 @@ static BlockDriver bdrv_gluster_unix = {
>      .bdrv_co_readv                = qemu_gluster_co_readv,
>      .bdrv_co_writev               = qemu_gluster_co_writev,
>      .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
> +    .bdrv_lockf                   = qemu_gluster_lockf,
>      .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
>  #ifdef CONFIG_GLUSTERFS_DISCARD
>      .bdrv_co_discard              = qemu_gluster_co_discard,
> @@ -794,6 +823,7 @@ static BlockDriver bdrv_gluster_rdma = {
>      .bdrv_co_readv                = qemu_gluster_co_readv,
>      .bdrv_co_writev               = qemu_gluster_co_writev,
>      .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
> +    .bdrv_lockf                   = qemu_gluster_lockf,
>      .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
>  #ifdef CONFIG_GLUSTERFS_DISCARD
>      .bdrv_co_discard              = qemu_gluster_co_discard,
> -- 
> 2.8.0
> 
>