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Squashfs: factor out remaining zlib dependencies into separate wrapper file

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Move zlib buffer init/destroy code into separate wrapper file.  Also
make zlib z_stream field a void * removing the need to include zlib.h
for most files.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
This commit is contained in:
Phillip Lougher 2009-09-23 19:04:49 +01:00
parent e6a6d37955
commit f1a40359f8
14 changed files with 51 additions and 33 deletions
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1
fs/squashfs/block.c
View File

@ -31,7 +31,6 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/buffer_head.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

1
fs/squashfs/cache.c
View File

@ -51,7 +51,6 @@
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/zlib.h>
#include <linux/pagemap.h>
#include "squashfs_fs.h"

1
fs/squashfs/dir.c
View File

@ -30,7 +30,6 @@
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

1
fs/squashfs/export.c
View File

@ -39,7 +39,6 @@
#include <linux/vfs.h>
#include <linux/dcache.h>
#include <linux/exportfs.h>
#include <linux/zlib.h>
#include <linux/slab.h>
#include "squashfs_fs.h"

1
fs/squashfs/file.c
View File

@ -47,7 +47,6 @@
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/mutex.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

1
fs/squashfs/fragment.c
View File

@ -36,7 +36,6 @@
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

1
fs/squashfs/id.c
View File

@ -34,7 +34,6 @@
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

1
fs/squashfs/inode.c
View File

@ -40,7 +40,6 @@
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

1
fs/squashfs/namei.c
View File

@ -57,7 +57,6 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/dcache.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

2
fs/squashfs/squashfs.h
View File

@ -71,6 +71,8 @@ extern struct inode *squashfs_iget(struct super_block *, long long,
extern int squashfs_read_inode(struct inode *, long long);
/* zlib_wrapper.c */
extern void *squashfs_zlib_init(void);
extern void squashfs_zlib_free(void *);
extern int squashfs_zlib_uncompress(struct squashfs_sb_info *, void **,
struct buffer_head **, int, int, int, int, int);

2
fs/squashfs/squashfs_fs_sb.h
View File

@ -64,7 +64,7 @@ struct squashfs_sb_info {
struct mutex read_data_mutex;
struct mutex meta_index_mutex;
struct meta_index *meta_index;
z_stream stream;
void *stream;
__le64 *inode_lookup_table;
u64 inode_table;
u64 directory_table;

14
fs/squashfs/super.c
View File

@ -35,7 +35,6 @@
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/zlib.h>
#include <linux/magic.h>
#include "squashfs_fs.h"
@ -87,12 +86,9 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
}
msblk = sb->s_fs_info;
msblk->stream.workspace = kmalloc(zlib_inflate_workspacesize(),
GFP_KERNEL);
if (msblk->stream.workspace == NULL) {
ERROR("Failed to allocate zlib workspace\n");
msblk->stream = squashfs_zlib_init();
if (msblk->stream == NULL)
goto failure;
}
sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
if (sblk == NULL) {
@ -292,17 +288,17 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
squashfs_cache_delete(msblk->block_cache);
squashfs_cache_delete(msblk->fragment_cache);
squashfs_cache_delete(msblk->read_page);
squashfs_zlib_free(msblk->stream);
kfree(msblk->inode_lookup_table);
kfree(msblk->fragment_index);
kfree(msblk->id_table);
kfree(msblk->stream.workspace);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
kfree(sblk);
return err;
failure:
kfree(msblk->stream.workspace);
squashfs_zlib_free(msblk->stream);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
return -ENOMEM;
@ -346,10 +342,10 @@ static void squashfs_put_super(struct super_block *sb)
squashfs_cache_delete(sbi->block_cache);
squashfs_cache_delete(sbi->fragment_cache);
squashfs_cache_delete(sbi->read_page);
squashfs_zlib_free(sbi->stream);
kfree(sbi->id_table);
kfree(sbi->fragment_index);
kfree(sbi->meta_index);
kfree(sbi->stream.workspace);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
}

1
fs/squashfs/symlink.c
View File

@ -36,7 +36,6 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/zlib.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"

56
fs/squashfs/zlib_wrapper.c
View File

@ -31,21 +31,51 @@
#include "squashfs_fs_i.h"
#include "squashfs.h"
void *squashfs_zlib_init()
{
z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
if (stream == NULL)
goto failed;
stream->workspace = kmalloc(zlib_inflate_workspacesize(),
GFP_KERNEL);
if (stream->workspace == NULL)
goto failed;
return stream;
failed:
ERROR("Failed to allocate zlib workspace\n");
kfree(stream);
return NULL;
}
void squashfs_zlib_free(void *strm)
{
z_stream *stream = strm;
if (stream)
kfree(stream->workspace);
kfree(stream);
}
int squashfs_zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
struct buffer_head **bh, int b, int offset, int length, int srclength,
int pages)
{
int zlib_err = 0, zlib_init = 0;
int avail, bytes, k = 0, page = 0;
z_stream *stream = msblk->stream;
mutex_lock(&msblk->read_data_mutex);
msblk->stream.avail_out = 0;
msblk->stream.avail_in = 0;
stream->avail_out = 0;
stream->avail_in = 0;
bytes = length;
do {
if (msblk->stream.avail_in == 0 && k < b) {
if (stream->avail_in == 0 && k < b) {
avail = min(bytes, msblk->devblksize - offset);
bytes -= avail;
wait_on_buffer(bh[k]);
@ -58,18 +88,18 @@ int squashfs_zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
continue;
}
msblk->stream.next_in = bh[k]->b_data + offset;
msblk->stream.avail_in = avail;
stream->next_in = bh[k]->b_data + offset;
stream->avail_in = avail;
offset = 0;
}
if (msblk->stream.avail_out == 0 && page < pages) {
msblk->stream.next_out = buffer[page++];
msblk->stream.avail_out = PAGE_CACHE_SIZE;
if (stream->avail_out == 0 && page < pages) {
stream->next_out = buffer[page++];
stream->avail_out = PAGE_CACHE_SIZE;
}
if (!zlib_init) {
zlib_err = zlib_inflateInit(&msblk->stream);
zlib_err = zlib_inflateInit(stream);
if (zlib_err != Z_OK) {
ERROR("zlib_inflateInit returned unexpected "
"result 0x%x, srclength %d\n",
@ -79,9 +109,9 @@ int squashfs_zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
zlib_init = 1;
}
zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
zlib_err = zlib_inflate(stream, Z_SYNC_FLUSH);
if (msblk->stream.avail_in == 0 && k < b)
if (stream->avail_in == 0 && k < b)
put_bh(bh[k++]);
} while (zlib_err == Z_OK);
@ -90,14 +120,14 @@ int squashfs_zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
goto release_mutex;
}
zlib_err = zlib_inflateEnd(&msblk->stream);
zlib_err = zlib_inflateEnd(stream);
if (zlib_err != Z_OK) {
ERROR("zlib_inflate error, data probably corrupt\n");
goto release_mutex;
}
mutex_unlock(&msblk->read_data_mutex);
return msblk->stream.total_out;
return stream->total_out;
release_mutex:
mutex_unlock(&msblk->read_data_mutex);