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-rw-r--r--fs/squashfs/Kconfig51
-rw-r--r--fs/squashfs/block.c18
-rw-r--r--fs/squashfs/cache.c4
-rw-r--r--fs/squashfs/inode.c6
-rw-r--r--fs/squashfs/squashfs.h2
-rw-r--r--fs/squashfs/super.c2
6 files changed, 66 insertions, 17 deletions
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
new file mode 100644
index 00000000000..25a00d19d68
--- /dev/null
+++ b/fs/squashfs/Kconfig
@@ -0,0 +1,51 @@
+config SQUASHFS
+ tristate "SquashFS 4.0 - Squashed file system support"
+ depends on BLOCK
+ select ZLIB_INFLATE
+ help
+ Saying Y here includes support for SquashFS 4.0 (a Compressed
+ Read-Only File System). Squashfs is a highly compressed read-only
+ filesystem for Linux. It uses zlib compression to compress both
+ files, inodes and directories. Inodes in the system are very small
+ and all blocks are packed to minimise data overhead. Block sizes
+ greater than 4K are supported up to a maximum of 1 Mbytes (default
+ block size 128K). SquashFS 4.0 supports 64 bit filesystems and files
+ (larger than 4GB), full uid/gid information, hard links and
+ timestamps.
+
+ Squashfs is intended for general read-only filesystem use, for
+ archival use (i.e. in cases where a .tar.gz file may be used), and in
+ embedded systems where low overhead is needed. Further information
+ and tools are available from http://squashfs.sourceforge.net.
+
+ If you want to compile this as a module ( = code which can be
+ inserted in and removed from the running kernel whenever you want),
+ say M here and read <file:Documentation/modules.txt>. The module
+ will be called squashfs. Note that the root file system (the one
+ containing the directory /) cannot be compiled as a module.
+
+ If unsure, say N.
+
+config SQUASHFS_EMBEDDED
+
+ bool "Additional option for memory-constrained systems"
+ depends on SQUASHFS
+ default n
+ help
+ Saying Y here allows you to specify cache size.
+
+ If unsure, say N.
+
+config SQUASHFS_FRAGMENT_CACHE_SIZE
+ int "Number of fragments cached" if SQUASHFS_EMBEDDED
+ depends on SQUASHFS
+ default "3"
+ help
+ By default SquashFS caches the last 3 fragments read from
+ the filesystem. Increasing this amount may mean SquashFS
+ has to re-read fragments less often from disk, at the expense
+ of extra system memory. Decreasing this amount will mean
+ SquashFS uses less memory at the expense of extra reads from disk.
+
+ Note there must be at least one cached fragment. Anything
+ much more than three will probably not make much difference.
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index c837dfc2b3c..2a796031034 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -80,7 +80,7 @@ static struct buffer_head *get_block_length(struct super_block *sb,
* generated a larger block - this does occasionally happen with zlib).
*/
int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
- int length, u64 *next_index, int srclength)
+ int length, u64 *next_index, int srclength, int pages)
{
struct squashfs_sb_info *msblk = sb->s_fs_info;
struct buffer_head **bh;
@@ -184,7 +184,7 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
offset = 0;
}
- if (msblk->stream.avail_out == 0) {
+ if (msblk->stream.avail_out == 0 && page < pages) {
msblk->stream.next_out = buffer[page++];
msblk->stream.avail_out = PAGE_CACHE_SIZE;
}
@@ -201,25 +201,20 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
zlib_init = 1;
}
- zlib_err = zlib_inflate(&msblk->stream, Z_NO_FLUSH);
+ zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
if (msblk->stream.avail_in == 0 && k < b)
put_bh(bh[k++]);
} while (zlib_err == Z_OK);
if (zlib_err != Z_STREAM_END) {
- ERROR("zlib_inflate returned unexpected result"
- " 0x%x, srclength %d, avail_in %d,"
- " avail_out %d\n", zlib_err, srclength,
- msblk->stream.avail_in,
- msblk->stream.avail_out);
+ ERROR("zlib_inflate error, data probably corrupt\n");
goto release_mutex;
}
zlib_err = zlib_inflateEnd(&msblk->stream);
if (zlib_err != Z_OK) {
- ERROR("zlib_inflateEnd returned unexpected result 0x%x,"
- " srclength %d\n", zlib_err, srclength);
+ ERROR("zlib_inflate error, data probably corrupt\n");
goto release_mutex;
}
length = msblk->stream.total_out;
@@ -268,7 +263,8 @@ block_release:
put_bh(bh[k]);
read_failure:
- ERROR("sb_bread failed reading block 0x%llx\n", cur_index);
+ ERROR("squashfs_read_data failed to read block 0x%llx\n",
+ (unsigned long long) index);
kfree(bh);
return -EIO;
}
diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c
index f29eda16d25..1c4739e33af 100644
--- a/fs/squashfs/cache.c
+++ b/fs/squashfs/cache.c
@@ -119,7 +119,7 @@ struct squashfs_cache_entry *squashfs_cache_get(struct super_block *sb,
entry->length = squashfs_read_data(sb, entry->data,
block, length, &entry->next_index,
- cache->block_size);
+ cache->block_size, cache->pages);
spin_lock(&cache->lock);
@@ -406,7 +406,7 @@ int squashfs_read_table(struct super_block *sb, void *buffer, u64 block,
for (i = 0; i < pages; i++, buffer += PAGE_CACHE_SIZE)
data[i] = buffer;
res = squashfs_read_data(sb, data, block, length |
- SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length);
+ SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length, pages);
kfree(data);
return res;
}
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index 7a63398bb85..9101dbde39e 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -133,7 +133,8 @@ int squashfs_read_inode(struct inode *inode, long long ino)
type = le16_to_cpu(sqshb_ino->inode_type);
switch (type) {
case SQUASHFS_REG_TYPE: {
- unsigned int frag_offset, frag_size, frag;
+ unsigned int frag_offset, frag;
+ int frag_size;
u64 frag_blk;
struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
@@ -175,7 +176,8 @@ int squashfs_read_inode(struct inode *inode, long long ino)
break;
}
case SQUASHFS_LREG_TYPE: {
- unsigned int frag_offset, frag_size, frag;
+ unsigned int frag_offset, frag;
+ int frag_size;
u64 frag_blk;
struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
index 6b2515d027d..0e9feb6adf7 100644
--- a/fs/squashfs/squashfs.h
+++ b/fs/squashfs/squashfs.h
@@ -34,7 +34,7 @@ static inline struct squashfs_inode_info *squashfs_i(struct inode *inode)
/* block.c */
extern int squashfs_read_data(struct super_block *, void **, u64, int, u64 *,
- int);
+ int, int);
/* cache.c */
extern struct squashfs_cache *squashfs_cache_init(char *, int, int);
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 071df5b5b49..681ec0d8379 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -389,7 +389,7 @@ static int __init init_squashfs_fs(void)
return err;
}
- printk(KERN_INFO "squashfs: version 4.0 (2009/01/03) "
+ printk(KERN_INFO "squashfs: version 4.0 (2009/01/31) "
"Phillip Lougher\n");
return 0;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-30 02:17:49 +0000