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Commit e1ddce71 authored by Anand Jain's avatar Anand Jain Committed by David Sterba
Browse files

btrfs: reduce arguments for decompress_bio ops 



struct compressed_bio pointer can be used instead.

Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 8140dc30

fs/btrfs/compression.c

+2 −44
Original line number Diff line number Diff line
@@ -42,45 +42,6 @@ 
#include "extent_io.h"

#include "extent_map.h"



struct compressed_bio {

	/* number of bios pending for this compressed extent */

	refcount_t pending_bios;



	/* the pages with the compressed data on them */

	struct page **compressed_pages;



	/* inode that owns this data */

	struct inode *inode;



	/* starting offset in the inode for our pages */

	u64 start;



	/* number of bytes in the inode we're working on */

	unsigned long len;



	/* number of bytes on disk */

	unsigned long compressed_len;



	/* the compression algorithm for this bio */

	int compress_type;



	/* number of compressed pages in the array */

	unsigned long nr_pages;



	/* IO errors */

	int errors;

	int mirror_num;



	/* for reads, this is the bio we are copying the data into */

	struct bio *orig_bio;



	/*

	 * the start of a variable length array of checksums only

	 * used by reads

	 */

	u32 sums;

};



static int btrfs_decompress_bio(struct compressed_bio *cb);



static inline int compressed_bio_size(struct btrfs_fs_info *fs_info,
@@ -963,12 +924,9 @@ static int btrfs_decompress_bio(struct compressed_bio *cb) 
	int type = cb->compress_type;



	workspace = find_workspace(type);



	ret = btrfs_compress_op[type - 1]->decompress_bio(workspace,

			cb->compressed_pages, cb->start, cb->orig_bio,

			cb->compressed_len);



	ret = btrfs_compress_op[type - 1]->decompress_bio(workspace, cb);

	free_workspace(type, workspace);



	return ret;

}

fs/btrfs/compression.h

+40 −4
Original line number Diff line number Diff line
@@ -34,6 +34,45 @@ 
/* Maximum size of data before compression */

#define BTRFS_MAX_UNCOMPRESSED		(SZ_128K)



struct compressed_bio {

	/* number of bios pending for this compressed extent */

	refcount_t pending_bios;



	/* the pages with the compressed data on them */

	struct page **compressed_pages;



	/* inode that owns this data */

	struct inode *inode;



	/* starting offset in the inode for our pages */

	u64 start;



	/* number of bytes in the inode we're working on */

	unsigned long len;



	/* number of bytes on disk */

	unsigned long compressed_len;



	/* the compression algorithm for this bio */

	int compress_type;



	/* number of compressed pages in the array */

	unsigned long nr_pages;



	/* IO errors */

	int errors;

	int mirror_num;



	/* for reads, this is the bio we are copying the data into */

	struct bio *orig_bio;



	/*

	 * the start of a variable length array of checksums only

	 * used by reads

	 */

	u32 sums;

};



void btrfs_init_compress(void);

void btrfs_exit_compress(void);
@@ -78,10 +117,7 @@ struct btrfs_compress_op { 
			      unsigned long *total_out);



	int (*decompress_bio)(struct list_head *workspace,

				 struct page **pages_in,

				 u64 disk_start,

				 struct bio *orig_bio,

				 size_t srclen);

				struct compressed_bio *cb);



	int (*decompress)(struct list_head *workspace,

			  unsigned char *data_in,

fs/btrfs/lzo.c

+6 −5
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/pagemap.h>

#include <linux/bio.h>

#include <linux/lzo.h>

#include <linux/refcount.h>

#include "compression.h"



#define LZO_LEN	4
@@ -254,16 +255,13 @@ static int lzo_compress_pages(struct list_head *ws, 
	return ret;

}



static int lzo_decompress_bio(struct list_head *ws,

				 struct page **pages_in,

				 u64 disk_start,

				 struct bio *orig_bio,

				 size_t srclen)

static int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb)

{

	struct workspace *workspace = list_entry(ws, struct workspace, list);

	int ret = 0, ret2;

	char *data_in;

	unsigned long page_in_index = 0;

	size_t srclen = cb->compressed_len;

	unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_SIZE);

	unsigned long buf_start;

	unsigned long buf_offset = 0;
@@ -278,6 +276,9 @@ static int lzo_decompress_bio(struct list_head *ws, 
	unsigned long tot_len;

	char *buf;

	bool may_late_unmap, need_unmap;

	struct page **pages_in = cb->compressed_pages;

	u64 disk_start = cb->start;

	struct bio *orig_bio = cb->orig_bio;



	data_in = kmap(pages_in[0]);

	tot_len = read_compress_length(data_in);

fs/btrfs/zlib.c

+6 −4
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <linux/sched.h>

#include <linux/pagemap.h>

#include <linux/bio.h>

#include <linux/refcount.h>

#include "compression.h"



struct workspace {
@@ -211,10 +212,7 @@ static int zlib_compress_pages(struct list_head *ws, 
	return ret;

}



static int zlib_decompress_bio(struct list_head *ws, struct page **pages_in,

				  u64 disk_start,

				  struct bio *orig_bio,

				  size_t srclen)

static int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb)

{

	struct workspace *workspace = list_entry(ws, struct workspace, list);

	int ret = 0, ret2;
@@ -222,8 +220,12 @@ static int zlib_decompress_bio(struct list_head *ws, struct page **pages_in, 
	char *data_in;

	size_t total_out = 0;

	unsigned long page_in_index = 0;

	size_t srclen = cb->compressed_len;

	unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_SIZE);

	unsigned long buf_start;

	struct page **pages_in = cb->compressed_pages;

	u64 disk_start = cb->start;

	struct bio *orig_bio = cb->orig_bio;



	data_in = kmap(pages_in[page_in_index]);

	workspace->strm.next_in = data_in;