btrfs: derive maximum output size in the compression implementation
The value of max_out can be calculated from the parameters passed to the
compressors, which is number of pages and the page size, and we don't
have to needlessly pass it around.
Signed-off-by: David Sterba <[email protected]>
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 11dcda5..c7721a6 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -932,8 +932,7 @@ int btrfs_compress_pages(int type, struct address_space *mapping,
u64 start, struct page **pages,
unsigned long *out_pages,
unsigned long *total_in,
- unsigned long *total_out,
- unsigned long max_out)
+ unsigned long *total_out)
{
struct list_head *workspace;
int ret;
@@ -943,8 +942,7 @@ int btrfs_compress_pages(int type, struct address_space *mapping,
ret = btrfs_compress_op[type-1]->compress_pages(workspace, mapping,
start, pages,
out_pages,
- total_in, total_out,
- max_out);
+ total_in, total_out);
free_workspace(type, workspace);
return ret;
}
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index 619e64c..39ec43a 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -41,8 +41,7 @@ int btrfs_compress_pages(int type, struct address_space *mapping,
u64 start, struct page **pages,
unsigned long *out_pages,
unsigned long *total_in,
- unsigned long *total_out,
- unsigned long max_out);
+ unsigned long *total_out);
int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
unsigned long start_byte, size_t srclen, size_t destlen);
int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start,
@@ -76,8 +75,7 @@ struct btrfs_compress_op {
struct page **pages,
unsigned long *out_pages,
unsigned long *total_in,
- unsigned long *total_out,
- unsigned long max_out);
+ unsigned long *total_out);
int (*decompress_bio)(struct list_head *workspace,
struct page **pages_in,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 11a4eea..0d932b9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -510,8 +510,7 @@ static noinline void compress_file_range(struct inode *inode,
pages,
&nr_pages,
&total_in,
- &total_compressed,
- BTRFS_MAX_COMPRESSED);
+ &total_compressed);
if (!ret) {
unsigned long offset = total_compressed &
diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c
index 0baf978..f48c8c1 100644
--- a/fs/btrfs/lzo.c
+++ b/fs/btrfs/lzo.c
@@ -90,8 +90,7 @@ static int lzo_compress_pages(struct list_head *ws,
struct page **pages,
unsigned long *out_pages,
unsigned long *total_in,
- unsigned long *total_out,
- unsigned long max_out)
+ unsigned long *total_out)
{
struct workspace *workspace = list_entry(ws, struct workspace, list);
int ret = 0;
@@ -103,6 +102,7 @@ static int lzo_compress_pages(struct list_head *ws,
unsigned long bytes_left;
unsigned long len = *total_out;
unsigned long nr_dest_pages = *out_pages;
+ const unsigned long max_out = nr_dest_pages * PAGE_SIZE;
size_t in_len;
size_t out_len;
char *buf;
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index e7f2020..135b108 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -77,8 +77,7 @@ static int zlib_compress_pages(struct list_head *ws,
struct page **pages,
unsigned long *out_pages,
unsigned long *total_in,
- unsigned long *total_out,
- unsigned long max_out)
+ unsigned long *total_out)
{
struct workspace *workspace = list_entry(ws, struct workspace, list);
int ret;
@@ -90,6 +89,7 @@ static int zlib_compress_pages(struct list_head *ws,
unsigned long bytes_left;
unsigned long len = *total_out;
unsigned long nr_dest_pages = *out_pages;
+ const unsigned long max_out = nr_dest_pages * PAGE_SIZE;
*out_pages = 0;
*total_out = 0;
