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ceph: buffer decoding helpers

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Helper for decoding into a ceph_buffer, and other misc decoding helpers
we will need.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
2010-02-02 16:11:19 -08:00
parent 79788c698b
commit c7e337d649
3 changed files with 53 additions and 0 deletions
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17
fs/ceph/buffer.c
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@@ -1,6 +1,7 @@
#include "ceph_debug.h"
#include "buffer.h"
#include "decode.h"
struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
{
@@ -59,3 +60,19 @@ int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp)
return 0;
}
int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
{
size_t len;
ceph_decode_need(p, end, sizeof(u32), bad);
len = ceph_decode_32(p);
dout("decode_buffer len %d\n", (int)len);
ceph_decode_need(p, end, len, bad);
*b = ceph_buffer_new(len, GFP_NOFS);
if (!*b)
return -ENOMEM;
ceph_decode_copy(p, (*b)->vec.iov_base, len);
return 0;
bad:
return -EINVAL;
}