| 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_kvmalloc */ |
| 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 | 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 | } |