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Linux/net/ceph/buffer.c

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  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 }
 59 

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