diff options
Diffstat (limited to 'crypto/scatterwalk.c')
| -rw-r--r-- | crypto/scatterwalk.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index 81afd1790a1d..3052f6507f53 100644 --- a/crypto/scatterwalk.c +++ b/crypto/scatterwalk.c @@ -23,14 +23,6 @@ #include "internal.h" #include "scatterwalk.h" -enum km_type crypto_km_types[] = { - KM_USER0, - KM_USER1, - KM_SOFTIRQ0, - KM_SOFTIRQ1, -}; -EXPORT_SYMBOL_GPL(crypto_km_types); - static inline void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out) { void *src = out ? buf : sgdata; @@ -107,3 +99,25 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, } } EXPORT_SYMBOL_GPL(scatterwalk_copychunks); + +void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, + unsigned int start, unsigned int nbytes, int out) +{ + struct scatter_walk walk; + unsigned int offset = 0; + + for (;;) { + scatterwalk_start(&walk, sg); + + if (start < offset + sg->length) + break; + + offset += sg->length; + sg = sg_next(sg); + } + + scatterwalk_advance(&walk, start - offset); + scatterwalk_copychunks(buf, &walk, nbytes, out); + scatterwalk_done(&walk, out, 0); +} +EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy); |