1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/ceph/ceph_debug.h> 4 5 #include <linux/module.h> 6 #include <linux/slab.h> 7 8 #include <linux/ceph/buffer.h> 9 #include <linux/ceph/decode.h> 10 #include <linux/ceph/libceph.h> /* for kvmalloc */ 11 12 struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp) 13 { 14 struct ceph_buffer *b; 15 16 b = kmalloc(sizeof(*b), gfp); 17 if (!b) 18 return NULL; 19 20 b->vec.iov_base = kvmalloc(len, gfp); 21 if (!b->vec.iov_base) { 22 kfree(b); 23 return NULL; 24 } 25 26 kref_init(&b->kref); 27 b->alloc_len = len; 28 b->vec.iov_len = len; 29 dout("buffer_new %p\n", b); 30 return b; 31 } 32 EXPORT_SYMBOL(ceph_buffer_new); 33 34 void ceph_buffer_release(struct kref *kref) 35 { 36 struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref); 37 38 dout("buffer_release %p\n", b); 39 kvfree(b->vec.iov_base); 40 kfree(b); 41 } 42 EXPORT_SYMBOL(ceph_buffer_release); 43 44 int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end) 45 { 46 size_t len; 47 48 ceph_decode_need(p, end, sizeof(u32), bad); 49 len = ceph_decode_32(p); 50 dout("decode_buffer len %d\n", (int)len); 51 ceph_decode_need(p, end, len, bad); 52 *b = ceph_buffer_new(len, GFP_NOFS); 53 if (!*b) 54 return -ENOMEM; 55 ceph_decode_copy(p, (*b)->vec.iov_base, len); 56 return 0; 57 bad: 58 return -EINVAL; 59 } 60