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btrfs: constify input buffer parameter in compression code

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The input buffers passed down to compression must never be changed,
switch type to u8 as it's a raw byte buffer and use const.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2022-11-07 17:30:21 +01:00
parent ad3daf1c3f
commit 3e09b5b229
5 changed files with 9 additions and 9 deletions
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4
fs/btrfs/compression.c
View file

@ -119,7 +119,7 @@ static int compression_decompress_bio(struct list_head *ws,
}
static int compression_decompress(int type, struct list_head *ws,
unsigned char *data_in, struct page *dest_page,
const u8 *data_in, struct page *dest_page,
unsigned long start_byte, size_t srclen, size_t destlen)
{
switch (type) {
@ -1232,7 +1232,7 @@ static int btrfs_decompress_bio(struct compressed_bio *cb)
* single page, and we want to read a single page out of it.
* start_byte tells us the offset into the compressed data we're interested in
*/
int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
int btrfs_decompress(int type, const u8 *data_in, struct page *dest_page,
unsigned long start_byte, size_t srclen, size_t destlen)
{
struct list_head *workspace;

8
fs/btrfs/compression.h
View file

@ -86,7 +86,7 @@ int btrfs_compress_pages(unsigned int type_level, struct address_space *mapping,
unsigned long *out_pages,
unsigned long *total_in,
unsigned long *total_out);
int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
int btrfs_decompress(int type, const u8 *data_in, struct page *dest_page,
unsigned long start_byte, size_t srclen, size_t destlen);
int btrfs_decompress_buf2page(const char *buf, u32 buf_len,
struct compressed_bio *cb, u32 decompressed);
@ -150,7 +150,7 @@ int zlib_compress_pages(struct list_head *ws, struct address_space *mapping,
u64 start, struct page **pages, unsigned long *out_pages,
unsigned long *total_in, unsigned long *total_out);
int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
int zlib_decompress(struct list_head *ws, unsigned char *data_in,
int zlib_decompress(struct list_head *ws, const u8 *data_in,
struct page *dest_page, unsigned long start_byte, size_t srclen,
size_t destlen);
struct list_head *zlib_alloc_workspace(unsigned int level);
@ -161,7 +161,7 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
u64 start, struct page **pages, unsigned long *out_pages,
unsigned long *total_in, unsigned long *total_out);
int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
int lzo_decompress(struct list_head *ws, unsigned char *data_in,
int lzo_decompress(struct list_head *ws, const u8 *data_in,
struct page *dest_page, unsigned long start_byte, size_t srclen,
size_t destlen);
struct list_head *lzo_alloc_workspace(unsigned int level);
@ -171,7 +171,7 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
u64 start, struct page **pages, unsigned long *out_pages,
unsigned long *total_in, unsigned long *total_out);
int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
int zstd_decompress(struct list_head *ws, unsigned char *data_in,
int zstd_decompress(struct list_head *ws, const u8 *data_in,
struct page *dest_page, unsigned long start_byte, size_t srclen,
size_t destlen);
void zstd_init_workspace_manager(void);

2
fs/btrfs/lzo.c
View file

@ -427,7 +427,7 @@ int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
return ret;
}
int lzo_decompress(struct list_head *ws, unsigned char *data_in,
int lzo_decompress(struct list_head *ws, const u8 *data_in,
struct page *dest_page, unsigned long start_byte, size_t srclen,
size_t destlen)
{

2
fs/btrfs/zlib.c
View file

@ -355,7 +355,7 @@ int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
return ret;
}
int zlib_decompress(struct list_head *ws, unsigned char *data_in,
int zlib_decompress(struct list_head *ws, const u8 *data_in,
struct page *dest_page, unsigned long start_byte, size_t srclen,
size_t destlen)
{

2
fs/btrfs/zstd.c
View file

@ -616,7 +616,7 @@ int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
return ret;
}
int zstd_decompress(struct list_head *ws, unsigned char *data_in,
int zstd_decompress(struct list_head *ws, const u8 *data_in,
struct page *dest_page, unsigned long start_byte, size_t srclen,
size_t destlen)
{