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Linux/net/ceph/buffer.c

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  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 ceph_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 = ceph_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 

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