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btrfs: add lzo workspace buffer length constants

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It makes it more readable for length checking and is be used repeatedly.

Signed-off-by: Dāvis Mosāns <davispuh@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Dāvis Mosāns 2022-02-02 23:44:54 +02:00 committed by David Sterba
parent 40e7efe057
commit dc4a4bdb3f
1 changed files with 7 additions and 4 deletions
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11
fs/btrfs/lzo.c
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@ -55,6 +55,9 @@
* 0x1000 | SegHdr N+1| Data payload N+1 ... |
*/
#define WORKSPACE_BUF_LENGTH (lzo1x_worst_compress(PAGE_SIZE))
#define WORKSPACE_CBUF_LENGTH (lzo1x_worst_compress(PAGE_SIZE))
struct workspace {
void *mem;
void *buf; /* where decompressed data goes */
@ -83,8 +86,8 @@ struct list_head *lzo_alloc_workspace(unsigned int level)
return ERR_PTR(-ENOMEM);
workspace->mem = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
workspace->buf = kvmalloc(lzo1x_worst_compress(PAGE_SIZE), GFP_KERNEL);
workspace->cbuf = kvmalloc(lzo1x_worst_compress(PAGE_SIZE), GFP_KERNEL);
workspace->buf = kvmalloc(WORKSPACE_BUF_LENGTH, GFP_KERNEL);
workspace->cbuf = kvmalloc(WORKSPACE_CBUF_LENGTH, GFP_KERNEL);
if (!workspace->mem || !workspace->buf || !workspace->cbuf)
goto fail;
@ -380,7 +383,7 @@ int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
kunmap(cur_page);
cur_in += LZO_LEN;
if (seg_len > lzo1x_worst_compress(PAGE_SIZE)) {
if (seg_len > WORKSPACE_CBUF_LENGTH) {
/*
* seg_len shouldn't be larger than we have allocated
* for workspace->cbuf
@ -433,7 +436,7 @@ int lzo_decompress(struct list_head *ws, unsigned char *data_in,
struct workspace *workspace = list_entry(ws, struct workspace, list);
size_t in_len;
size_t out_len;
size_t max_segment_len = lzo1x_worst_compress(PAGE_SIZE);
size_t max_segment_len = WORKSPACE_BUF_LENGTH;
int ret = 0;
char *kaddr;
unsigned long bytes;