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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - crypto/scatterwalk.h
4 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
5 * Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com>
6 * Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
15 #ifndef _CRYPTO_SCATTERWALK_H
16 #define _CRYPTO_SCATTERWALK_H
19 #include <linux/scatterlist.h>
23 static inline unsigned long scatterwalk_samebuf(struct scatter_walk
*walk_in
,
24 struct scatter_walk
*walk_out
)
26 return !(((sg_page(walk_in
->sg
) - sg_page(walk_out
->sg
)) << PAGE_SHIFT
) +
27 (int)(walk_in
->offset
- walk_out
->offset
));
30 static inline unsigned int scatterwalk_pagelen(struct scatter_walk
*walk
)
32 unsigned int len
= walk
->sg
->offset
+ walk
->sg
->length
- walk
->offset
;
33 unsigned int len_this_page
= offset_in_page(~walk
->offset
) + 1;
34 return len_this_page
> len
? len
: len_this_page
;
37 static inline unsigned int scatterwalk_clamp(struct scatter_walk
*walk
,
40 unsigned int len_this_page
= scatterwalk_pagelen(walk
);
41 return nbytes
> len_this_page
? len_this_page
: nbytes
;
44 static inline void scatterwalk_advance(struct scatter_walk
*walk
,
47 walk
->offset
+= nbytes
;
50 static inline unsigned int scatterwalk_aligned(struct scatter_walk
*walk
,
51 unsigned int alignmask
)
53 return !(walk
->offset
& alignmask
);
56 static inline struct page
*scatterwalk_page(struct scatter_walk
*walk
)
58 return sg_page(walk
->sg
) + (walk
->offset
>> PAGE_SHIFT
);
61 static inline void scatterwalk_unmap(void *vaddr
, int out
)
63 crypto_kunmap(vaddr
, out
);
66 void scatterwalk_start(struct scatter_walk
*walk
, struct scatterlist
*sg
);
67 void scatterwalk_copychunks(void *buf
, struct scatter_walk
*walk
,
68 size_t nbytes
, int out
);
69 void *scatterwalk_map(struct scatter_walk
*walk
, int out
);
70 void scatterwalk_done(struct scatter_walk
*walk
, int out
, int more
);
72 void scatterwalk_map_and_copy(void *buf
, struct scatterlist
*sg
,
73 unsigned int start
, unsigned int nbytes
, int out
);
75 #endif /* _CRYPTO_SCATTERWALK_H */