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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>
This commit is contained in:
Juergen Gross 2018-08-13 16:01:13 +02:00 committed by Konrad Rzeszutek Wilk
parent 4bcddbae01
commit d77ff24e7f
2 changed files with 7 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/block/xen-blkback/blkback.c
View File

@ -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;

7
drivers/block/xen-blkback/common.h
View File

@ -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;
};