UBIFS is one of the remaining users of the obsolete 'comp' compression
API exposed by the crypto subsystem. Given that it operates strictly on
contiguous buffers that are either entirely in lowmem or covered by a
single page, the conversion to the acomp API is quite straight-forward.
Only synchronous acomp implementations are considered at the moment, and
whether or not a future conversion to permit asynchronous ones too will
be worth the effort remains to be seen.
Signed-off-by: Ard Biesheuvel
---
fs/ubifs/compress.c | 61 ++--
fs/ubifs/file.c | 46 ---
fs/ubifs/journal.c | 19 --
fs/ubifs/ubifs.h| 15 +++--
4 files changed, 90 insertions(+), 51 deletions(-)
diff --git a/fs/ubifs/compress.c b/fs/ubifs/compress.c
index 75461777c466b1c9..570919b218a0a8cc 100644
--- a/fs/ubifs/compress.c
+++ b/fs/ubifs/compress.c
@@ -82,15 +82,15 @@ struct ubifs_compressor
*ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
/**
* ubifs_compress - compress data.
- * @in_buf: data to compress
+ * @in_sg: data to compress
* @in_len: length of the data to compress
* @out_buf: output buffer where compressed data should be stored
* @out_len: output buffer length is returned here
* @compr_type: type of compression to use on enter, actually used compression
* type on exit
*
- * This function compresses input buffer @in_buf of length @in_len and stores
- * the result in the output buffer @out_buf and the resulting length in
+ * This function compresses input scatterlist @in_sg of length @in_len and
+ * stores the result in the output buffer @out_buf and the resulting length in
* @out_len. If the input buffer does not compress, it is just copied to the
* @out_buf. The same happens if @compr_type is %UBIFS_COMPR_NONE or if
* compression error occurred.
@@ -98,11 +98,12 @@ struct ubifs_compressor
*ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
* Note, if the input buffer was not compressed, it is copied to the output
* buffer and %UBIFS_COMPR_NONE is returned in @compr_type.
*/
-void ubifs_compress(const struct ubifs_info *c, const void *in_buf,
+void ubifs_compress(const struct ubifs_info *c, struct scatterlist *in_sg,
int in_len, void *out_buf, int *out_len, int *compr_type)
{
int err;
struct ubifs_compressor *compr = ubifs_compressors[*compr_type];
+ struct scatterlist out_sg;
if (*compr_type == UBIFS_COMPR_NONE)
goto no_compr;
@@ -111,10 +112,13 @@ void ubifs_compress(const struct ubifs_info *c, const
void *in_buf,
if (in_len < UBIFS_MIN_COMPR_LEN)
goto no_compr;
+ sg_init_one(&out_sg, out_buf, *out_len);
+
if (compr->comp_mutex)
mutex_lock(compr->comp_mutex);
- err = crypto_comp_compress(compr->cc, in_buf, in_len, out_buf,
- (unsigned int *)out_len);
+ acomp_request_set_params(compr->req, in_sg, &out_sg, in_len, *out_len);
+ err = crypto_acomp_compress(compr->req);
+ *out_len = compr->req->dlen;
if (compr->comp_mutex)
mutex_unlock(compr->comp_mutex);
if (unlikely(err)) {
@@ -133,7 +137,7 @@ void ubifs_compress(const struct ubifs_info *c, const void
*in_buf,
return;
no_compr:
- memcpy(out_buf, in_buf, in_len);
+ sg_copy_to_buffer(in_sg, 1, out_buf, in_len);
*out_len = in_len;
*compr_type = UBIFS_COMPR_NONE;
}
@@ -142,19 +146,20 @@ void ubifs_compress(const struct ubifs_info *c, const
void *in_buf,
* ubifs_decompress - decompress data.
* @in_buf: data to decompress
* @in_len: length of the data to decompress
- * @out_buf: output buffer where decompressed data should
+ * @out_sg: output buffer where decompressed data should be stored
* @out_len: output length is returned here
* @compr_type: type of compression
*
- * This function decompresses data from buffer @in_buf into buffer @out_buf.
+ * This function decompresses data from buffer @in_buf into scatterlist
@out_sg.
* The length of the uncompressed data is returned in @out_len. This functions
* returns %0 on success or a negative error code on failure.
*/
-int ubifs_decompress(const struct ubifs_info *c, const void *in_buf,
-int in_len, void *out_buf, int *out_len, int compr_type)
+int ubifs_decompress(const struct ubifs_info *c, const void *in_buf, int
in_len,
+struct scatterlist *out_sg, int *out_len, int compr_type)
{
int err;
struct ubifs_compressor *compr;
+ struct scatterlist in_sg;
if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) {
ubifs_err(c, "invalid compression type %d", compr_type);
@@ -169,15 +174,18 @@ int ubifs_decompress(const struct ubifs_info *c, const
void *in_buf,
}
if (compr_type == UBIFS_COMPR_NONE) {
- memcpy(out_buf, in_buf, in_len);
+ sg_copy_from_buffer(out
