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authorLinus Torvalds <torvalds@linux-foundation.org>2010-03-05 13:46:04 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-05 13:46:04 -0500
commitb24bc1e61cec2174faf5dfa632da16b6ca17144f (patch)
tree33abe2345c70d4bce31cda8fe2e562a8a9a24dfc
parent64ba9926759792cf7b95f823402e2781edd1b5d4 (diff)
parent06862f884d9c2453daaf0c1d070c69cf444f10b1 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus
* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus: Squashfs: get rid of obsolete definition in header file Squashfs: get rid of obsolete variable in struct squashfs_sb_info Squashfs: add decompressor entries for lzma and lzo Squashfs: add a decompressor framework Squashfs: factor out remaining zlib dependencies into separate wrapper file Squashfs: move zlib decompression wrapper code into a separate file
Diffstat
-rw-r--r--fs/squashfs/Makefile2
-rw-r--r--fs/squashfs/block.c76
-rw-r--r--fs/squashfs/cache.c1
-rw-r--r--fs/squashfs/decompressor.c68
-rw-r--r--fs/squashfs/decompressor.h55
-rw-r--r--fs/squashfs/dir.c1
-rw-r--r--fs/squashfs/export.c1
-rw-r--r--fs/squashfs/file.c1
-rw-r--r--fs/squashfs/fragment.c1
-rw-r--r--fs/squashfs/id.c1
-rw-r--r--fs/squashfs/inode.c1
-rw-r--r--fs/squashfs/namei.c1
-rw-r--r--fs/squashfs/squashfs.h8
-rw-r--r--fs/squashfs/squashfs_fs.h6
-rw-r--r--fs/squashfs/squashfs_fs_sb.h40
-rw-r--r--fs/squashfs/super.c49
-rw-r--r--fs/squashfs/symlink.c1
-rw-r--r--fs/squashfs/zlib_wrapper.c150
18 files changed, 335 insertions, 128 deletions
diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
index 70e3244fa30f..df8a19ef870d 100644
--- a/fs/squashfs/Makefile
+++ b/fs/squashfs/Makefile
@@ -4,4 +4,4 @@
4 4
5obj-$(CONFIG_SQUASHFS) += squashfs.o 5obj-$(CONFIG_SQUASHFS) += squashfs.o
6squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o 6squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
7squashfs-y += namei.o super.o symlink.o 7squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 2a7960310349..1cb0d81b164b 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -29,15 +29,14 @@
29#include <linux/fs.h> 29#include <linux/fs.h>
30#include <linux/vfs.h> 30#include <linux/vfs.h>
31#include <linux/slab.h> 31#include <linux/slab.h>
32#include <linux/mutex.h>
33#include <linux/string.h> 32#include <linux/string.h>
34#include <linux/buffer_head.h> 33#include <linux/buffer_head.h>
35#include <linux/zlib.h>
36 34
37#include "squashfs_fs.h" 35#include "squashfs_fs.h"
38#include "squashfs_fs_sb.h" 36#include "squashfs_fs_sb.h"
39#include "squashfs_fs_i.h" 37#include "squashfs_fs_i.h"
40#include "squashfs.h" 38#include "squashfs.h"
39#include "decompressor.h"
41 40
42/* 41/*
43 * Read the metadata block length, this is stored in the first two 42 * Read the metadata block length, this is stored in the first two
@@ -153,72 +152,10 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
153 } 152 }
154 153
155 if (compressed) { 154 if (compressed) {
156 int zlib_err = 0, zlib_init = 0; 155 length = squashfs_decompress(msblk, buffer, bh, b, offset,
157 156 length, srclength, pages);
158 /* 157 if (length < 0)
159 * Uncompress block. 158 goto read_failure;
160 */
161
162 mutex_lock(&msblk->read_data_mutex);
163
164 msblk->stream.avail_out = 0;
165 msblk->stream.avail_in = 0;
166
167 bytes = length;
168 do {
169 if (msblk->stream.avail_in == 0 && k < b) {
170 avail = min(bytes, msblk->devblksize - offset);
171 bytes -= avail;
172 wait_on_buffer(bh[k]);
173 if (!buffer_uptodate(bh[k]))
174 goto release_mutex;
175
176 if (avail == 0) {
177 offset = 0;
178 put_bh(bh[k++]);
179 continue;
180 }
181
182 msblk->stream.next_in = bh[k]->b_data + offset;
183 msblk->stream.avail_in = avail;
184 offset = 0;
185 }
186
187 if (msblk->stream.avail_out == 0 && page < pages) {
188 msblk->stream.next_out = buffer[page++];
189 msblk->stream.avail_out = PAGE_CACHE_SIZE;
190 }
191
192 if (!zlib_init) {
193 zlib_err = zlib_inflateInit(&msblk->stream);
194 if (zlib_err != Z_OK) {
195 ERROR("zlib_inflateInit returned"
196 " unexpected result 0x%x,"
197 " srclength %d\n", zlib_err,
198 srclength);
199 goto release_mutex;
200 }
201 zlib_init = 1;
202 }
203
204 zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
205
206 if (msblk->stream.avail_in == 0 && k < b)
207 put_bh(bh[k++]);
208 } while (zlib_err == Z_OK);
209
210 if (zlib_err != Z_STREAM_END) {
211 ERROR("zlib_inflate error, data probably corrupt\n");
212 goto release_mutex;
213 }
214
215 zlib_err = zlib_inflateEnd(&msblk->stream);
216 if (zlib_err != Z_OK) {
217 ERROR("zlib_inflate error, data probably corrupt\n");
218 goto release_mutex;
219 }
220 length = msblk->stream.total_out;
221 mutex_unlock(&msblk->read_data_mutex);
222 } else { 159 } else {
223 /* 160 /*
224 * Block is uncompressed. 161 * Block is uncompressed.
@@ -255,9 +192,6 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
255 kfree(bh); 192 kfree(bh);
256 return length; 193 return length;
257 194
258release_mutex:
259 mutex_unlock(&msblk->read_data_mutex);
260
261block_release: 195block_release:
262 for (; k < b; k++) 196 for (; k < b; k++)
263 put_bh(bh[k]); 197 put_bh(bh[k]);
diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c
index 40c98fa6b5d6..57314bee9059 100644
--- a/fs/squashfs/cache.c
+++ b/fs/squashfs/cache.c
@@ -51,7 +51,6 @@
51#include <linux/sched.h> 51#include <linux/sched.h>
52#include <linux/spinlock.h> 52#include <linux/spinlock.h>
53#include <linux/wait.h> 53#include <linux/wait.h>
54#include <linux/zlib.h>
55#include <linux/pagemap.h> 54#include <linux/pagemap.h>
56 55
57#include "squashfs_fs.h" 56#include "squashfs_fs.h"
diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
new file mode 100644
index 000000000000..157478da6ac9
--- /dev/null
+++ b/fs/squashfs/decompressor.c
@@ -0,0 +1,68 @@
1/*
2 * Squashfs - a compressed read only filesystem for Linux
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
5 * Phillip Lougher <phillip@lougher.demon.co.uk>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2,
10 * or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 *
21 * decompressor.c
22 */
23
24#include <linux/types.h>
25#include <linux/mutex.h>
26#include <linux/buffer_head.h>
27
28#include "squashfs_fs.h"
29#include "squashfs_fs_sb.h"
30#include "squashfs_fs_i.h"
31#include "decompressor.h"
32#include "squashfs.h"
33
34/*
35 * This file (and decompressor.h) implements a decompressor framework for
36 * Squashfs, allowing multiple decompressors to be easily supported
37 */
38
39static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = {
40 NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
41};
42
43static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = {
44 NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
45};
46
47static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
48 NULL, NULL, NULL, 0, "unknown", 0
49};
50
51static const struct squashfs_decompressor *decompressor[] = {
52 &squashfs_zlib_comp_ops,
53 &squashfs_lzma_unsupported_comp_ops,
54 &squashfs_lzo_unsupported_comp_ops,
55 &squashfs_unknown_comp_ops
56};
57
58
59const struct squashfs_decompressor *squashfs_lookup_decompressor(int id)
60{
61 int i;
62
63 for (i = 0; decompressor[i]->id; i++)
64 if (id == decompressor[i]->id)
65 break;
66
67 return decompressor[i];
68}
diff --git a/fs/squashfs/decompressor.h b/fs/squashfs/decompressor.h
new file mode 100644
index 000000000000..7425f80783f6
--- /dev/null
+++ b/fs/squashfs/decompressor.h
@@ -0,0 +1,55 @@
1#ifndef DECOMPRESSOR_H
2#define DECOMPRESSOR_H
3/*
4 * Squashfs - a compressed read only filesystem for Linux
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
7 * Phillip Lougher <phillip@lougher.demon.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2,
12 * or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 *
23 * decompressor.h
24 */
25
26struct squashfs_decompressor {
27 void *(*init)(struct squashfs_sb_info *);
28 void (*free)(void *);
29 int (*decompress)(struct squashfs_sb_info *, void **,
30 struct buffer_head **, int, int, int, int, int);
31 int id;
32 char *name;
33 int supported;
34};
35
36static inline void *squashfs_decompressor_init(struct squashfs_sb_info *msblk)
37{
38 return msblk->decompressor->init(msblk);
39}
40
41static inline void squashfs_decompressor_free(struct squashfs_sb_info *msblk,
42 void *s)
43{
44 if (msblk->decompressor)
45 msblk->decompressor->free(s);
46}
47
48static inline int squashfs_decompress(struct squashfs_sb_info *msblk,
49 void **buffer, struct buffer_head **bh, int b, int offset, int length,
50 int srclength, int pages)
51{
52 return msblk->decompressor->decompress(msblk, buffer, bh, b, offset,
53 length, srclength, pages);
54}
55#endif
diff --git a/fs/squashfs/dir.c b/fs/squashfs/dir.c
index 566b0eaed868..12b933ac6585 100644
--- a/fs/squashfs/dir.c
+++ b/fs/squashfs/dir.c
@@ -30,7 +30,6 @@
30#include <linux/fs.h> 30#include <linux/fs.h>
31#include <linux/vfs.h> 31#include <linux/vfs.h>
32#include <linux/slab.h> 32#include <linux/slab.h>
33#include <linux/zlib.h>
34 33
35#include "squashfs_fs.h" 34#include "squashfs_fs.h"
36#include "squashfs_fs_sb.h" 35#include "squashfs_fs_sb.h"
diff --git a/fs/squashfs/export.c b/fs/squashfs/export.c
index 2b1b8fe5e037..7f93d5a9ee05 100644
--- a/fs/squashfs/export.c
+++ b/fs/squashfs/export.c
@@ -39,7 +39,6 @@
39#include <linux/vfs.h> 39#include <linux/vfs.h>
40#include <linux/dcache.h> 40#include <linux/dcache.h>
41#include <linux/exportfs.h> 41#include <linux/exportfs.h>
42#include <linux/zlib.h>
43#include <linux/slab.h> 42#include <linux/slab.h>
44 43
45#include "squashfs_fs.h" 44#include "squashfs_fs.h"
diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c
index 717767d831df..a25c5060bdcb 100644
--- a/fs/squashfs/file.c
+++ b/fs/squashfs/file.c
@@ -47,7 +47,6 @@
47#include <linux/string.h> 47#include <linux/string.h>
48#include <linux/pagemap.h> 48#include <linux/pagemap.h>
49#include <linux/mutex.h> 49#include <linux/mutex.h>
50#include <linux/zlib.h>
51 50
52#include "squashfs_fs.h" 51#include "squashfs_fs.h"
53#include "squashfs_fs_sb.h" 52#include "squashfs_fs_sb.h"
diff --git a/fs/squashfs/fragment.c b/fs/squashfs/fragment.c
index b5a2c15bbbc7..7c90bbd6879d 100644
--- a/fs/squashfs/fragment.c
+++ b/fs/squashfs/fragment.c
@@ -36,7 +36,6 @@
36#include <linux/fs.h> 36#include <linux/fs.h>
37#include <linux/vfs.h> 37#include <linux/vfs.h>
38#include <linux/slab.h> 38#include <linux/slab.h>
39#include <linux/zlib.h>
40 39
41#include "squashfs_fs.h" 40#include "squashfs_fs.h"
42#include "squashfs_fs_sb.h" 41#include "squashfs_fs_sb.h"
diff --git a/fs/squashfs/id.c b/fs/squashfs/id.c
index 3795b837ba28..b7f64bcd2b70 100644
--- a/fs/squashfs/id.c
+++ b/fs/squashfs/id.c
@@ -34,7 +34,6 @@
34#include <linux/fs.h> 34#include <linux/fs.h>
35#include <linux/vfs.h> 35#include <linux/vfs.h>
36#include <linux/slab.h> 36#include <linux/slab.h>
37#include <linux/zlib.h>
38 37
39#include "squashfs_fs.h" 38#include "squashfs_fs.h"
40#include "squashfs_fs_sb.h" 39#include "squashfs_fs_sb.h"
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index 9101dbde39ec..49daaf669e41 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -40,7 +40,6 @@
40 40
41#include <linux/fs.h> 41#include <linux/fs.h>
42#include <linux/vfs.h> 42#include <linux/vfs.h>
43#include <linux/zlib.h>
44 43
45#include "squashfs_fs.h" 44#include "squashfs_fs.h"
46#include "squashfs_fs_sb.h" 45#include "squashfs_fs_sb.h"
diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c
index 9e398653b22b..5266bd8ad932 100644
--- a/fs/squashfs/namei.c
+++ b/fs/squashfs/namei.c
@@ -57,7 +57,6 @@
57#include <linux/slab.h> 57#include <linux/slab.h>
58#include <linux/string.h> 58#include <linux/string.h>
59#include <linux/dcache.h> 59#include <linux/dcache.h>
60#include <linux/zlib.h>
61 60
62#include "squashfs_fs.h" 61#include "squashfs_fs.h"
63#include "squashfs_fs_sb.h" 62#include "squashfs_fs_sb.h"
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
index 0e9feb6adf7e..fe2587af5512 100644
--- a/fs/squashfs/squashfs.h
+++ b/fs/squashfs/squashfs.h
@@ -51,6 +51,9 @@ extern struct squashfs_cache_entry *squashfs_get_datablock(struct super_block *,
51 u64, int); 51 u64, int);
52extern int squashfs_read_table(struct super_block *, void *, u64, int); 52extern int squashfs_read_table(struct super_block *, void *, u64, int);
53 53
54/* decompressor.c */
55extern const struct squashfs_decompressor *squashfs_lookup_decompressor(int);
56
54/* export.c */ 57/* export.c */
55extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64, 58extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64,
56 unsigned int); 59 unsigned int);
@@ -71,7 +74,7 @@ extern struct inode *squashfs_iget(struct super_block *, long long,
71extern int squashfs_read_inode(struct inode *, long long); 74extern int squashfs_read_inode(struct inode *, long long);
72 75
73/* 76/*
74 * Inodes and files operations 77 * Inodes, files and decompressor operations
75 */ 78 */
76 79
77/* dir.c */ 80/* dir.c */
@@ -88,3 +91,6 @@ extern const struct inode_operations squashfs_dir_inode_ops;
88 91
89/* symlink.c */ 92/* symlink.c */
90extern const struct address_space_operations squashfs_symlink_aops; 93extern const struct address_space_operations squashfs_symlink_aops;
94
95/* zlib_wrapper.c */
96extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h
index 283daafc568e..79024245ea00 100644
--- a/fs/squashfs/squashfs_fs.h
+++ b/fs/squashfs/squashfs_fs.h
@@ -183,8 +183,6 @@
183#define SQUASHFS_MAX_FILE_SIZE (1LL << \ 183#define SQUASHFS_MAX_FILE_SIZE (1LL << \
184 (SQUASHFS_MAX_FILE_SIZE_LOG - 2)) 184 (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
185 185
186#define SQUASHFS_MARKER_BYTE 0xff
187
188/* meta index cache */ 186/* meta index cache */
189#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int)) 187#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
190#define SQUASHFS_META_ENTRIES 127 188#define SQUASHFS_META_ENTRIES 127
@@ -211,7 +209,9 @@ struct meta_index {
211/* 209/*
212 * definitions for structures on disk 210 * definitions for structures on disk
213 */ 211 */
214#define ZLIB_COMPRESSION 1 212#define ZLIB_COMPRESSION 1
213#define LZMA_COMPRESSION 2
214#define LZO_COMPRESSION 3
215 215
216struct squashfs_super_block { 216struct squashfs_super_block {
217 __le32 s_magic; 217 __le32 s_magic;
diff --git a/fs/squashfs/squashfs_fs_sb.h b/fs/squashfs/squashfs_fs_sb.h
index c8c65614dd1c..2e77dc547e25 100644
--- a/fs/squashfs/squashfs_fs_sb.h
+++ b/fs/squashfs/squashfs_fs_sb.h
@@ -52,25 +52,25 @@ struct squashfs_cache_entry {
52}; 52};
53 53
54struct squashfs_sb_info { 54struct squashfs_sb_info {
55 int devblksize; 55 const struct squashfs_decompressor *decompressor;
56 int devblksize_log2; 56 int devblksize;
57 struct squashfs_cache *block_cache; 57 int devblksize_log2;
58 struct squashfs_cache *fragment_cache; 58 struct squashfs_cache *block_cache;
59 struct squashfs_cache *read_page; 59 struct squashfs_cache *fragment_cache;
60 int next_meta_index; 60 struct squashfs_cache *read_page;
61 __le64 *id_table; 61 int next_meta_index;
62 __le64 *fragment_index; 62 __le64 *id_table;
63 unsigned int *fragment_index_2; 63 __le64 *fragment_index;
64 struct mutex read_data_mutex; 64 struct mutex read_data_mutex;
65 struct mutex meta_index_mutex; 65 struct mutex meta_index_mutex;
66 struct meta_index *meta_index; 66 struct meta_index *meta_index;
67 z_stream stream; 67 void *stream;
68 __le64 *inode_lookup_table; 68 __le64 *inode_lookup_table;
69 u64 inode_table; 69 u64 inode_table;
70 u64 directory_table; 70 u64 directory_table;
71 unsigned int block_size; 71 unsigned int block_size;
72 unsigned short block_log; 72 unsigned short block_log;
73 long long bytes_used; 73 long long bytes_used;
74 unsigned int inodes; 74 unsigned int inodes;
75}; 75};
76#endif 76#endif
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 6c197ef53add..3550aec2f655 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -35,34 +35,41 @@
35#include <linux/pagemap.h> 35#include <linux/pagemap.h>
36#include <linux/init.h> 36#include <linux/init.h>
37#include <linux/module.h> 37#include <linux/module.h>
38#include <linux/zlib.h>
39#include <linux/magic.h> 38#include <linux/magic.h>
40 39
41#include "squashfs_fs.h" 40#include "squashfs_fs.h"
42#include "squashfs_fs_sb.h" 41#include "squashfs_fs_sb.h"
43#include "squashfs_fs_i.h" 42#include "squashfs_fs_i.h"
44#include "squashfs.h" 43#include "squashfs.h"
44#include "decompressor.h"
45 45
46static struct file_system_type squashfs_fs_type; 46static struct file_system_type squashfs_fs_type;
47static const struct super_operations squashfs_super_ops; 47static const struct super_operations squashfs_super_ops;
48 48
49static int supported_squashfs_filesystem(short major, short minor, short comp) 49static const struct squashfs_decompressor *supported_squashfs_filesystem(short
50 major, short minor, short id)
50{ 51{
52 const struct squashfs_decompressor *decompressor;
53
51 if (major < SQUASHFS_MAJOR) { 54 if (major < SQUASHFS_MAJOR) {
52 ERROR("Major/Minor mismatch, older Squashfs %d.%d " 55 ERROR("Major/Minor mismatch, older Squashfs %d.%d "
53 "filesystems are unsupported\n", major, minor); 56 "filesystems are unsupported\n", major, minor);
54 return -EINVAL; 57 return NULL;
55 } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) { 58 } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) {
56 ERROR("Major/Minor mismatch, trying to mount newer " 59 ERROR("Major/Minor mismatch, trying to mount newer "
57 "%d.%d filesystem\n", major, minor); 60 "%d.%d filesystem\n", major, minor);
58 ERROR("Please update your kernel\n"); 61 ERROR("Please update your kernel\n");
59 return -EINVAL; 62 return NULL;
60 } 63 }
61 64
62 if (comp != ZLIB_COMPRESSION) 65 decompressor = squashfs_lookup_decompressor(id);
63 return -EINVAL; 66 if (!decompressor->supported) {
67 ERROR("Filesystem uses \"%s\" compression. This is not "
68 "supported\n", decompressor->name);
69 return NULL;
70 }
64 71
65 return 0; 72 return decompressor;
66} 73}
67 74
68 75
@@ -87,13 +94,6 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
87 } 94 }
88 msblk = sb->s_fs_info; 95 msblk = sb->s_fs_info;
89 96
90 msblk->stream.workspace = kmalloc(zlib_inflate_workspacesize(),
91 GFP_KERNEL);
92 if (msblk->stream.workspace == NULL) {
93 ERROR("Failed to allocate zlib workspace\n");
94 goto failure;
95 }
96
97 sblk = kzalloc(sizeof(*sblk), GFP_KERNEL); 97 sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
98 if (sblk == NULL) { 98 if (sblk == NULL) {
99 ERROR("Failed to allocate squashfs_super_block\n"); 99 ERROR("Failed to allocate squashfs_super_block\n");
@@ -120,25 +120,25 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
120 goto failed_mount; 120 goto failed_mount;
121 } 121 }
122 122
123 err = -EINVAL;
124
123 /* Check it is a SQUASHFS superblock */ 125 /* Check it is a SQUASHFS superblock */
124 sb->s_magic = le32_to_cpu(sblk->s_magic); 126 sb->s_magic = le32_to_cpu(sblk->s_magic);
125 if (sb->s_magic != SQUASHFS_MAGIC) { 127 if (sb->s_magic != SQUASHFS_MAGIC) {
126 if (!silent) 128 if (!silent)
127 ERROR("Can't find a SQUASHFS superblock on %s\n", 129 ERROR("Can't find a SQUASHFS superblock on %s\n",
128 bdevname(sb->s_bdev, b)); 130 bdevname(sb->s_bdev, b));
129 err = -EINVAL;
130 goto failed_mount; 131 goto failed_mount;
131 } 132 }
132 133
133 /* Check the MAJOR & MINOR versions and compression type */ 134 /* Check the MAJOR & MINOR versions and lookup compression type */
134 err = supported_squashfs_filesystem(le16_to_cpu(sblk->s_major), 135 msblk->decompressor = supported_squashfs_filesystem(
136 le16_to_cpu(sblk->s_major),
135 le16_to_cpu(sblk->s_minor), 137 le16_to_cpu(sblk->s_minor),
136 le16_to_cpu(sblk->compression)); 138 le16_to_cpu(sblk->compression));
137 if (err < 0) 139 if (msblk->decompressor == NULL)
138 goto failed_mount; 140 goto failed_mount;
139 141
140 err = -EINVAL;
141
142 /* 142 /*
143 * Check if there's xattrs in the filesystem. These are not 143 * Check if there's xattrs in the filesystem. These are not
144 * supported in this version, so warn that they will be ignored. 144 * supported in this version, so warn that they will be ignored.
@@ -205,6 +205,10 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
205 205
206 err = -ENOMEM; 206 err = -ENOMEM;
207 207
208 msblk->stream = squashfs_decompressor_init(msblk);
209 if (msblk->stream == NULL)
210 goto failed_mount;
211
208 msblk->block_cache = squashfs_cache_init("metadata", 212 msblk->block_cache = squashfs_cache_init("metadata",
209 SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); 213 SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE);
210 if (msblk->block_cache == NULL) 214 if (msblk->block_cache == NULL)
@@ -292,17 +296,16 @@ failed_mount:
292 squashfs_cache_delete(msblk->block_cache); 296 squashfs_cache_delete(msblk->block_cache);
293 squashfs_cache_delete(msblk->fragment_cache); 297 squashfs_cache_delete(msblk->fragment_cache);
294 squashfs_cache_delete(msblk->read_page); 298 squashfs_cache_delete(msblk->read_page);
299 squashfs_decompressor_free(msblk, msblk->stream);
295 kfree(msblk->inode_lookup_table); 300 kfree(msblk->inode_lookup_table);
296 kfree(msblk->fragment_index); 301 kfree(msblk->fragment_index);
297 kfree(msblk->id_table); 302 kfree(msblk->id_table);
298 kfree(msblk->stream.workspace);
299 kfree(sb->s_fs_info); 303 kfree(sb->s_fs_info);
300 sb->s_fs_info = NULL; 304 sb->s_fs_info = NULL;
301 kfree(sblk); 305 kfree(sblk);
302 return err; 306 return err;
303 307
304failure: 308failure:
305 kfree(msblk->stream.workspace);
306 kfree(sb->s_fs_info); 309 kfree(sb->s_fs_info);
307 sb->s_fs_info = NULL; 310 sb->s_fs_info = NULL;
308 return -ENOMEM; 311 return -ENOMEM;
@@ -346,10 +349,10 @@ static void squashfs_put_super(struct super_block *sb)
346 squashfs_cache_delete(sbi->block_cache); 349 squashfs_cache_delete(sbi->block_cache);
347 squashfs_cache_delete(sbi->fragment_cache); 350 squashfs_cache_delete(sbi->fragment_cache);
348 squashfs_cache_delete(sbi->read_page); 351 squashfs_cache_delete(sbi->read_page);
352 squashfs_decompressor_free(sbi, sbi->stream);
349 kfree(sbi->id_table); 353 kfree(sbi->id_table);
350 kfree(sbi->fragment_index); 354 kfree(sbi->fragment_index);
351 kfree(sbi->meta_index); 355 kfree(sbi->meta_index);
352 kfree(sbi->stream.workspace);
353 kfree(sb->s_fs_info); 356 kfree(sb->s_fs_info);
354 sb->s_fs_info = NULL; 357 sb->s_fs_info = NULL;
355 } 358 }
diff --git a/fs/squashfs/symlink.c b/fs/squashfs/symlink.c
index 83d87880aac8..e80be2022a7f 100644
--- a/fs/squashfs/symlink.c
+++ b/fs/squashfs/symlink.c
@@ -36,7 +36,6 @@
36#include <linux/slab.h> 36#include <linux/slab.h>
37#include <linux/string.h> 37#include <linux/string.h>
38#include <linux/pagemap.h> 38#include <linux/pagemap.h>
39#include <linux/zlib.h>
40 39
41#include "squashfs_fs.h" 40#include "squashfs_fs.h"
42#include "squashfs_fs_sb.h" 41#include "squashfs_fs_sb.h"
diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
new file mode 100644
index 000000000000..4dd70e04333b
--- /dev/null
+++ b/fs/squashfs/zlib_wrapper.c
@@ -0,0 +1,150 @@
1/*
2 * Squashfs - a compressed read only filesystem for Linux
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
5 * Phillip Lougher <phillip@lougher.demon.co.uk>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2,
10 * or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 *
21 * zlib_wrapper.c
22 */
23
24
25#include <linux/mutex.h>
26#include <linux/buffer_head.h>
27#include <linux/zlib.h>
28
29#include "squashfs_fs.h"
30#include "squashfs_fs_sb.h"
31#include "squashfs_fs_i.h"
32#include "squashfs.h"
33#include "decompressor.h"
34
35static void *zlib_init(struct squashfs_sb_info *dummy)
36{
37 z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
38 if (stream == NULL)
39 goto failed;
40 stream->workspace = kmalloc(zlib_inflate_workspacesize(),
41 GFP_KERNEL);
42 if (stream->workspace == NULL)
43 goto failed;
44
45 return stream;
46
47failed:
48 ERROR("Failed to allocate zlib workspace\n");
49 kfree(stream);
50 return NULL;
51}
52
53
54static void zlib_free(void *strm)
55{
56 z_stream *stream = strm;
57
58 if (stream)
59 kfree(stream->workspace);
60 kfree(stream);
61}
62
63
64static int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
65 struct buffer_head **bh, int b, int offset, int length, int srclength,
66 int pages)
67{
68 int zlib_err = 0, zlib_init = 0;
69 int avail, bytes, k = 0, page = 0;
70 z_stream *stream = msblk->stream;
71
72 mutex_lock(&msblk->read_data_mutex);
73
74 stream->avail_out = 0;
75 stream->avail_in = 0;
76
77 bytes = length;
78 do {
79 if (stream->avail_in == 0 && k < b) {
80 avail = min(bytes, msblk->devblksize - offset);
81 bytes -= avail;
82 wait_on_buffer(bh[k]);
83 if (!buffer_uptodate(bh[k]))
84 goto release_mutex;
85
86 if (avail == 0) {
87 offset = 0;
88 put_bh(bh[k++]);
89 continue;
90 }
91
92 stream->next_in = bh[k]->b_data + offset;
93 stream->avail_in = avail;
94 offset = 0;
95 }
96
97 if (stream->avail_out == 0 && page < pages) {
98 stream->next_out = buffer[page++];
99 stream->avail_out = PAGE_CACHE_SIZE;
100 }
101
102 if (!zlib_init) {
103 zlib_err = zlib_inflateInit(stream);
104 if (zlib_err != Z_OK) {
105 ERROR("zlib_inflateInit returned unexpected "
106 "result 0x%x, srclength %d\n",
107 zlib_err, srclength);
108 goto release_mutex;
109 }
110 zlib_init = 1;
111 }
112
113 zlib_err = zlib_inflate(stream, Z_SYNC_FLUSH);
114
115 if (stream->avail_in == 0 && k < b)
116 put_bh(bh[k++]);
117 } while (zlib_err == Z_OK);
118
119 if (zlib_err != Z_STREAM_END) {
120 ERROR("zlib_inflate error, data probably corrupt\n");
121 goto release_mutex;
122 }
123
124 zlib_err = zlib_inflateEnd(stream);
125 if (zlib_err != Z_OK) {
126 ERROR("zlib_inflate error, data probably corrupt\n");
127 goto release_mutex;
128 }
129
130 mutex_unlock(&msblk->read_data_mutex);
131 return stream->total_out;
132
133release_mutex:
134 mutex_unlock(&msblk->read_data_mutex);
135
136 for (; k < b; k++)
137 put_bh(bh[k]);
138
139 return -EIO;
140}
141
142const struct squashfs_decompressor squashfs_zlib_comp_ops = {
143 .init = zlib_init,
144 .free = zlib_free,
145 .decompress = zlib_uncompress,
146 .id = ZLIB_COMPRESSION,
147 .name = "zlib",
148 .supported = 1
149};
150
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-25 16:58:12 -0500