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authorJuergen Gross <jgross@suse.com>2018-08-13 16:01:13 +0200
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2018-08-27 12:12:04 -0400
commitd77ff24e7fa2258877fa0b87efa06b9a58a37aab (patch)
treef565def0002a001f377daeafc317e1ad311b5574 /drivers/block
parent4bcddbae019df2614ea36976ba3d36313f93c6d3 (diff)
xen/blkback: move persistent grants flags to bool
The struct persistent_gnt flags member is meant to be a bitfield of different flags. There is only PERSISTENT_GNT_ACTIVE flag left, so convert it to a bool named "active". Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/xen-blkback/blkback.c13
-rw-r--r--drivers/block/xen-blkback/common.h7
2 files changed, 7 insertions, 13 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 9eae7b243f68..fd1e19f1a49f 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -255,8 +255,7 @@ static int add_persistent_gnt(struct xen_blkif_ring *ring,
}
}
- bitmap_zero(persistent_gnt->flags, PERSISTENT_GNT_FLAGS_SIZE);
- set_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags);
+ persistent_gnt->active = true;
/* Add new node and rebalance tree. */
rb_link_node(&(persistent_gnt->node), parent, new);
rb_insert_color(&(persistent_gnt->node), &ring->persistent_gnts);
@@ -280,11 +279,11 @@ static struct persistent_gnt *get_persistent_gnt(struct xen_blkif_ring *ring,
else if (gref > data->gnt)
node = node->rb_right;
else {
- if(test_bit(PERSISTENT_GNT_ACTIVE, data->flags)) {
+ if (data->active) {
pr_alert_ratelimited("requesting a grant already in use\n");
return NULL;
}
- set_bit(PERSISTENT_GNT_ACTIVE, data->flags);
+ data->active = true;
atomic_inc(&ring->persistent_gnt_in_use);
return data;
}
@@ -295,10 +294,10 @@ static struct persistent_gnt *get_persistent_gnt(struct xen_blkif_ring *ring,
static void put_persistent_gnt(struct xen_blkif_ring *ring,
struct persistent_gnt *persistent_gnt)
{
- if(!test_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags))
+ if (!persistent_gnt->active)
pr_alert_ratelimited("freeing a grant already unused\n");
persistent_gnt->last_used = jiffies;
- clear_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags);
+ persistent_gnt->active = false;
atomic_dec(&ring->persistent_gnt_in_use);
}
@@ -429,7 +428,7 @@ purge_list:
BUG_ON(persistent_gnt->handle ==
BLKBACK_INVALID_HANDLE);
- if (test_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags))
+ if (persistent_gnt->active)
continue;
if (!scan_used && !persistent_gnt_timeout(persistent_gnt))
continue;
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 7bff72db3b7e..2339b8d39c5e 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -233,11 +233,6 @@ struct xen_vbd {
struct backend_info;
-/* Number of available flags */
-#define PERSISTENT_GNT_FLAGS_SIZE 1
-/* This persistent grant is currently in use */
-#define PERSISTENT_GNT_ACTIVE 0
-
/* Number of requests that we can fit in a ring */
#define XEN_BLKIF_REQS_PER_PAGE 32
@@ -246,7 +241,7 @@ struct persistent_gnt {
grant_ref_t gnt;
grant_handle_t handle;
unsigned long last_used;
- DECLARE_BITMAP(flags, PERSISTENT_GNT_FLAGS_SIZE);
+ bool active;
struct rb_node node;
struct list_head remove_node;
};