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author | J. Bruce Fields <bfields@citi.umich.edu> | 2010-05-04 17:27:05 +0200 |
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committer | J. Bruce Fields <bfields@citi.umich.edu> | 2010-05-04 17:29:05 +0200 |
commit | 5306293c9cd2caf41849cc909281bda628bb989e (patch) | |
tree | 3be4e8231e2772c8a43ddbef5c6a72c20b3054bb /fs/ceph/buffer.h | |
parent | nfsd4: use local variable in nfs4svc_encode_compoundres (diff) | |
parent | Linux 2.6.34-rc6 (diff) | |
download | linux-5306293c9cd2caf41849cc909281bda628bb989e.tar.xz linux-5306293c9cd2caf41849cc909281bda628bb989e.zip |
Merge commit 'v2.6.34-rc6'
Conflicts:
fs/nfsd/nfs4callback.c
Diffstat (limited to 'fs/ceph/buffer.h')
-rw-r--r-- | fs/ceph/buffer.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/fs/ceph/buffer.h b/fs/ceph/buffer.h new file mode 100644 index 000000000000..58d19014068f --- /dev/null +++ b/fs/ceph/buffer.h @@ -0,0 +1,39 @@ +#ifndef __FS_CEPH_BUFFER_H +#define __FS_CEPH_BUFFER_H + +#include <linux/kref.h> +#include <linux/mm.h> +#include <linux/vmalloc.h> +#include <linux/types.h> +#include <linux/uio.h> + +/* + * a simple reference counted buffer. + * + * use kmalloc for small sizes (<= one page), vmalloc for larger + * sizes. + */ +struct ceph_buffer { + struct kref kref; + struct kvec vec; + size_t alloc_len; + bool is_vmalloc; +}; + +extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp); +extern void ceph_buffer_release(struct kref *kref); + +static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b) +{ + kref_get(&b->kref); + return b; +} + +static inline void ceph_buffer_put(struct ceph_buffer *b) +{ + kref_put(&b->kref, ceph_buffer_release); +} + +extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end); + +#endif |