1 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/module.h> 5 #include <linux/slab.h> 6 7 #include <linux/ceph/buffer.h> 8 #include <linux/ceph/decode.h> 9 #include <linux/ceph/libceph.h> /* for ceph_kv{malloc,free} */ 10 11 struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp) 12 { 13 struct ceph_buffer *b; 14 15 b = kmalloc(sizeof(*b), gfp); 16 if (!b) 17 return NULL; 18 19 b->vec.iov_base = ceph_kvmalloc(len, gfp); 20 if (!b->vec.iov_base) { 21 kfree(b); 22 return NULL; 23 } 24 25 kref_init(&b->kref); 26 b->alloc_len = len; 27 b->vec.iov_len = len; 28 dout("buffer_new %p\n", b); 29 return b; 30 } 31 EXPORT_SYMBOL(ceph_buffer_new); 32 33 void ceph_buffer_release(struct kref *kref) 34 { 35 struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref); 36 37 dout("buffer_release %p\n", b); 38 ceph_kvfree(b->vec.iov_base); 39 kfree(b); 40 } 41 EXPORT_SYMBOL(ceph_buffer_release); 42 43 int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end) 44 { 45 size_t len; 46 47 ceph_decode_need(p, end, sizeof(u32), bad); 48 len = ceph_decode_32(p); 49 dout("decode_buffer len %d\n", (int)len); 50 ceph_decode_need(p, end, len, bad); 51 *b = ceph_buffer_new(len, GFP_NOFS); 52 if (!*b) 53 return -ENOMEM; 54 ceph_decode_copy(p, (*b)->vec.iov_base, len); 55 return 0; 56 bad: 57 return -EINVAL; 58 } 59