target/linux/generic-2.6/patches-2.6.31/002-squashfs_factor_out_remaining_zlib.patch

   1 From 37c44e85fd49676ec15ccaeea065662c1fbcda7d Mon Sep 17 00:00:00 2001
   2 From: Phillip Lougher <phillip@lougher.demon.co.uk>
   3 Date: Wed, 23 Sep 2009 19:04:49 +0100
   4 Subject: [PATCH] Squashfs: Factor out remaining zlib dependencies into separate wrapper file
   5
   6 Move zlib buffer init/destroy code into separate wrapper file.  Also
   7 make zlib z_stream field a void * removing the need to include zlib.h
   8 for most files.
   9
  10 Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
  11 ---
  12  fs/squashfs/block.c          |    1 -
  13  fs/squashfs/cache.c          |    1 -
  14  fs/squashfs/dir.c            |    1 -
  15  fs/squashfs/export.c         |    1 -
  16  fs/squashfs/file.c           |    1 -
  17  fs/squashfs/fragment.c       |    1 -
  18  fs/squashfs/id.c             |    1 -
  19  fs/squashfs/inode.c          |    1 -
  20  fs/squashfs/namei.c          |    1 -
  21  fs/squashfs/squashfs.h       |    2 +
  22  fs/squashfs/squashfs_fs_sb.h |    2 +-
  23  fs/squashfs/super.c          |   14 +++------
  24  fs/squashfs/symlink.c        |    1 -
  25  fs/squashfs/zlib_wrapper.c   |   56 ++++++++++++++++++++++++++++++++---------
  26  14 files changed, 51 insertions(+), 33 deletions(-)
  27
  28 --- a/fs/squashfs/block.c
  29 +++ b/fs/squashfs/block.c
  30 @@ -31,7 +31,6 @@
  31  #include <linux/slab.h>
  32  #include <linux/string.h>
  33  #include <linux/buffer_head.h>
  34 -#include <linux/zlib.h>
  35
  36  #include "squashfs_fs.h"
  37  #include "squashfs_fs_sb.h"
  38 --- a/fs/squashfs/cache.c
  39 +++ b/fs/squashfs/cache.c
  40 @@ -51,7 +51,6 @@
  41  #include <linux/sched.h>
  42  #include <linux/spinlock.h>
  43  #include <linux/wait.h>
  44 -#include <linux/zlib.h>
  45  #include <linux/pagemap.h>
  46
  47  #include "squashfs_fs.h"
  48 --- a/fs/squashfs/dir.c
  49 +++ b/fs/squashfs/dir.c
  50 @@ -30,7 +30,6 @@
  51  #include <linux/fs.h>
  52  #include <linux/vfs.h>
  53  #include <linux/slab.h>
  54 -#include <linux/zlib.h>
  55
  56  #include "squashfs_fs.h"
  57  #include "squashfs_fs_sb.h"
  58 --- a/fs/squashfs/export.c
  59 +++ b/fs/squashfs/export.c
  60 @@ -39,7 +39,6 @@
  61  #include <linux/vfs.h>
  62  #include <linux/dcache.h>
  63  #include <linux/exportfs.h>
  64 -#include <linux/zlib.h>
  65  #include <linux/slab.h>
  66
  67  #include "squashfs_fs.h"
  68 --- a/fs/squashfs/file.c
  69 +++ b/fs/squashfs/file.c
  70 @@ -47,7 +47,6 @@
  71  #include <linux/string.h>
  72  #include <linux/pagemap.h>
  73  #include <linux/mutex.h>
  74 -#include <linux/zlib.h>
  75
  76  #include "squashfs_fs.h"
  77  #include "squashfs_fs_sb.h"
  78 --- a/fs/squashfs/fragment.c
  79 +++ b/fs/squashfs/fragment.c
  80 @@ -36,7 +36,6 @@
  81  #include <linux/fs.h>
  82  #include <linux/vfs.h>
  83  #include <linux/slab.h>
  84 -#include <linux/zlib.h>
  85
  86  #include "squashfs_fs.h"
  87  #include "squashfs_fs_sb.h"
  88 --- a/fs/squashfs/id.c
  89 +++ b/fs/squashfs/id.c
  90 @@ -34,7 +34,6 @@
  91  #include <linux/fs.h>
  92  #include <linux/vfs.h>
  93  #include <linux/slab.h>
  94 -#include <linux/zlib.h>
  95
  96  #include "squashfs_fs.h"
  97  #include "squashfs_fs_sb.h"
  98 --- a/fs/squashfs/inode.c
  99 +++ b/fs/squashfs/inode.c
 100 @@ -40,7 +40,6 @@
 101
 102  #include <linux/fs.h>
 103  #include <linux/vfs.h>
 104 -#include <linux/zlib.h>
 105
 106  #include "squashfs_fs.h"
 107  #include "squashfs_fs_sb.h"
 108 --- a/fs/squashfs/namei.c
 109 +++ b/fs/squashfs/namei.c
 110 @@ -57,7 +57,6 @@
 111  #include <linux/slab.h>
 112  #include <linux/string.h>
 113  #include <linux/dcache.h>
 114 -#include <linux/zlib.h>
 115
 116  #include "squashfs_fs.h"
 117  #include "squashfs_fs_sb.h"
 118 --- a/fs/squashfs/squashfs.h
 119 +++ b/fs/squashfs/squashfs.h
 120 @@ -71,6 +71,8 @@ extern struct inode *squashfs_iget(struc
 121  extern int squashfs_read_inode(struct inode *, long long);
 122
 123  /* zlib_wrapper.c */
 124 +extern void *zlib_init(void);
 125 +extern void zlib_free(void *);
 126  extern int zlib_uncompress(struct squashfs_sb_info *, void **,
 127                                 struct buffer_head **, int, int, int, int, int);
 128
 129 --- a/fs/squashfs/squashfs_fs_sb.h
 130 +++ b/fs/squashfs/squashfs_fs_sb.h
 131 @@ -64,7 +64,7 @@ struct squashfs_sb_info {
 132         struct mutex            read_data_mutex;
 133         struct mutex            meta_index_mutex;
 134         struct meta_index       *meta_index;
 135 -       z_stream                stream;
 136 +       void                    *stream;
 137         __le64                  *inode_lookup_table;
 138         u64                     inode_table;
 139         u64                     directory_table;
 140 --- a/fs/squashfs/super.c
 141 +++ b/fs/squashfs/super.c
 142 @@ -35,7 +35,6 @@
 143  #include <linux/pagemap.h>
 144  #include <linux/init.h>
 145  #include <linux/module.h>
 146 -#include <linux/zlib.h>
 147  #include <linux/magic.h>
 148
 149  #include "squashfs_fs.h"
 150 @@ -87,12 +86,9 @@ static int squashfs_fill_super(struct su
 151         }
 152         msblk = sb->s_fs_info;
 153
 154 -       msblk->stream.workspace = kmalloc(zlib_inflate_workspacesize(),
 155 -               GFP_KERNEL);
 156 -       if (msblk->stream.workspace == NULL) {
 157 -               ERROR("Failed to allocate zlib workspace\n");
 158 +       msblk->stream = zlib_init();
 159 +       if (msblk->stream == NULL)
 160                 goto failure;
 161 -       }
 162
 163         sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
 164         if (sblk == NULL) {
 165 @@ -292,17 +288,17 @@ failed_mount:
 166         squashfs_cache_delete(msblk->block_cache);
 167         squashfs_cache_delete(msblk->fragment_cache);
 168         squashfs_cache_delete(msblk->read_page);
 169 +       zlib_free(msblk->stream);
 170         kfree(msblk->inode_lookup_table);
 171         kfree(msblk->fragment_index);
 172         kfree(msblk->id_table);
 173 -       kfree(msblk->stream.workspace);
 174         kfree(sb->s_fs_info);
 175         sb->s_fs_info = NULL;
 176         kfree(sblk);
 177         return err;
 178
 179  failure:
 180 -       kfree(msblk->stream.workspace);
 181 +       zlib_free(msblk->stream);
 182         kfree(sb->s_fs_info);
 183         sb->s_fs_info = NULL;
 184         return -ENOMEM;
 185 @@ -346,10 +342,10 @@ static void squashfs_put_super(struct su
 186                 squashfs_cache_delete(sbi->block_cache);
 187                 squashfs_cache_delete(sbi->fragment_cache);
 188                 squashfs_cache_delete(sbi->read_page);
 189 +               zlib_free(sbi->stream);
 190                 kfree(sbi->id_table);
 191                 kfree(sbi->fragment_index);
 192                 kfree(sbi->meta_index);
 193 -               kfree(sbi->stream.workspace);
 194                 kfree(sb->s_fs_info);
 195                 sb->s_fs_info = NULL;
 196         }
 197 --- a/fs/squashfs/symlink.c
 198 +++ b/fs/squashfs/symlink.c
 199 @@ -36,7 +36,6 @@
 200  #include <linux/slab.h>
 201  #include <linux/string.h>
 202  #include <linux/pagemap.h>
 203 -#include <linux/zlib.h>
 204
 205  #include "squashfs_fs.h"
 206  #include "squashfs_fs_sb.h"
 207 --- a/fs/squashfs/zlib_wrapper.c
 208 +++ b/fs/squashfs/zlib_wrapper.c
 209 @@ -31,21 +31,51 @@
 210  #include "squashfs_fs_i.h"
 211  #include "squashfs.h"
 212
 213 +void *zlib_init()
 214 +{
 215 +       z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
 216 +       if (stream == NULL)
 217 +               goto failed;
 218 +       stream->workspace = kmalloc(zlib_inflate_workspacesize(),
 219 +               GFP_KERNEL);
 220 +       if (stream->workspace == NULL)
 221 +               goto failed;
 222 +
 223 +       return stream;
 224 +
 225 +failed:
 226 +       ERROR("Failed to allocate zlib workspace\n");
 227 +       kfree(stream);
 228 +       return NULL;
 229 +}
 230 +
 231 +
 232 +void zlib_free(void *strm)
 233 +{
 234 +       z_stream *stream = strm;
 235 +
 236 +       if (stream)
 237 +               kfree(stream->workspace);
 238 +       kfree(stream);
 239 +}
 240 +
 241 +
 242  int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
 243         struct buffer_head **bh, int b, int offset, int length, int srclength,
 244         int pages)
 245  {
 246         int zlib_err = 0, zlib_init = 0;
 247         int avail, bytes, k = 0, page = 0;
 248 +       z_stream *stream = msblk->stream;
 249
 250         mutex_lock(&msblk->read_data_mutex);
 251
 252 -       msblk->stream.avail_out = 0;
 253 -       msblk->stream.avail_in = 0;
 254 +       stream->avail_out = 0;
 255 +       stream->avail_in = 0;
 256
 257         bytes = length;
 258         do {
 259 -               if (msblk->stream.avail_in == 0 && k < b) {
 260 +               if (stream->avail_in == 0 && k < b) {
 261                         avail = min(bytes, msblk->devblksize - offset);
 262                         bytes -= avail;
 263                         wait_on_buffer(bh[k]);
 264 @@ -58,18 +88,18 @@ int zlib_uncompress(struct squashfs_sb_i
 265                                 continue;
 266                         }
 267
 268 -                       msblk->stream.next_in = bh[k]->b_data + offset;
 269 -                       msblk->stream.avail_in = avail;
 270 +                       stream->next_in = bh[k]->b_data + offset;
 271 +                       stream->avail_in = avail;
 272                         offset = 0;
 273                 }
 274
 275 -               if (msblk->stream.avail_out == 0 && page < pages) {
 276 -                       msblk->stream.next_out = buffer[page++];
 277 -                       msblk->stream.avail_out = PAGE_CACHE_SIZE;
 278 +               if (stream->avail_out == 0 && page < pages) {
 279 +                       stream->next_out = buffer[page++];
 280 +                       stream->avail_out = PAGE_CACHE_SIZE;
 281                 }
 282
 283                 if (!zlib_init) {
 284 -                       zlib_err = zlib_inflateInit(&msblk->stream);
 285 +                       zlib_err = zlib_inflateInit(stream);
 286                         if (zlib_err != Z_OK) {
 287                                 ERROR("zlib_inflateInit returned unexpected "
 288                                         "result 0x%x, srclength %d\n",
 289 @@ -79,9 +109,9 @@ int zlib_uncompress(struct squashfs_sb_i
 290                         zlib_init = 1;
 291                 }
 292
 293 -               zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
 294 +               zlib_err = zlib_inflate(stream, Z_SYNC_FLUSH);
 295
 296 -               if (msblk->stream.avail_in == 0 && k < b)
 297 +               if (stream->avail_in == 0 && k < b)
 298                         put_bh(bh[k++]);
 299         } while (zlib_err == Z_OK);
 300
 301 @@ -90,14 +120,14 @@ int zlib_uncompress(struct squashfs_sb_i
 302                 goto release_mutex;
 303         }
 304
 305 -       zlib_err = zlib_inflateEnd(&msblk->stream);
 306 +       zlib_err = zlib_inflateEnd(stream);
 307         if (zlib_err != Z_OK) {
 308                 ERROR("zlib_inflate error, data probably corrupt\n");
 309                 goto release_mutex;
 310         }
 311
 312         mutex_unlock(&msblk->read_data_mutex);
 313 -       return msblk->stream.total_out;
 314 +       return stream->total_out;
 315
 316  release_mutex:
 317         mutex_unlock(&msblk->read_data_mutex);