| 1 | #include "ceph_debug.h" |
| 2 | |
| 3 | #include <linux/err.h> |
| 4 | #include <linux/sched.h> |
| 5 | #include <linux/types.h> |
| 6 | #include <linux/vmalloc.h> |
| 7 | |
| 8 | #include "msgpool.h" |
| 9 | |
| 10 | static void *alloc_fn(gfp_t gfp_mask, void *arg) |
| 11 | { |
| 12 | struct ceph_msgpool *pool = arg; |
| 13 | |
| 14 | return ceph_msg_new(0, pool->front_len); |
| 15 | } |
| 16 | |
| 17 | static void free_fn(void *element, void *arg) |
| 18 | { |
| 19 | ceph_msg_put(element); |
| 20 | } |
| 21 | |
| 22 | int ceph_msgpool_init(struct ceph_msgpool *pool, |
| 23 | int front_len, int size, bool blocking) |
| 24 | { |
| 25 | pool->front_len = front_len; |
| 26 | pool->pool = mempool_create(size, alloc_fn, free_fn, pool); |
| 27 | if (!pool->pool) |
| 28 | return -ENOMEM; |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | void ceph_msgpool_destroy(struct ceph_msgpool *pool) |
| 33 | { |
| 34 | mempool_destroy(pool->pool); |
| 35 | } |
| 36 | |
| 37 | struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, |
| 38 | int front_len) |
| 39 | { |
| 40 | if (front_len > pool->front_len) { |
| 41 | pr_err("msgpool_get pool %p need front %d, pool size is %d\n", |
| 42 | pool, front_len, pool->front_len); |
| 43 | WARN_ON(1); |
| 44 | |
| 45 | /* try to alloc a fresh message */ |
| 46 | return ceph_msg_new(0, front_len); |
| 47 | } |
| 48 | |
| 49 | return mempool_alloc(pool->pool, GFP_NOFS); |
| 50 | } |
| 51 | |
| 52 | void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg) |
| 53 | { |
| 54 | /* reset msg front_len; user may have changed it */ |
| 55 | msg->front.iov_len = pool->front_len; |
| 56 | msg->hdr.front_len = cpu_to_le32(pool->front_len); |
| 57 | |
| 58 | kref_init(&msg->kref); /* retake single ref */ |
| 59 | } |