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authorPhillip Lougher <phillip@lougher.demon.co.uk>2010-12-09 02:08:31 +0000
committerPhillip Lougher <phillip@lougher.demon.co.uk>2011-01-13 21:16:52 +0000
commit7a43ae523744c01b6187013e781f44c2281c579c (patch)
tree7f122fb883ef7cd86f08f90b770e03cae601efd3
parent81bb8debd0d570dc67dc1e9d8b612632cb941893 (diff)
Squashfs: Add XZ compression configuration option
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
-rw-r--r--fs/squashfs/Kconfig15
-rw-r--r--fs/squashfs/Makefile1
-rw-r--r--fs/squashfs/decompressor.c7
-rw-r--r--fs/squashfs/decompressor.h5
4 files changed, 28 insertions, 0 deletions
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
index e5f63da64d04..50cc4edbca06 100644
--- a/fs/squashfs/Kconfig
+++ b/fs/squashfs/Kconfig
@@ -53,6 +53,21 @@ config SQUASHFS_LZO
If unsure, say N.
+config SQUASHFS_XZ
+ bool "Include support for XZ compressed file systems"
+ depends on SQUASHFS
+ select XZ_DEC
+ help
+ Saying Y here includes support for reading Squashfs file systems
+ compressed with XZ compresssion. XZ gives better compression than
+ the default zlib compression, at the expense of greater CPU and
+ memory overhead.
+
+ XZ is not the standard compression used in Squashfs and so most
+ file systems will be readable without selecting this option.
+
+ If unsure, say N.
+
config SQUASHFS_EMBEDDED
bool "Additional option for memory-constrained systems"
depends on SQUASHFS
diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
index 7672bac8d328..cecf2bea07af 100644
--- a/fs/squashfs/Makefile
+++ b/fs/squashfs/Makefile
@@ -7,3 +7,4 @@ squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
squashfs-$(CONFIG_SQUASHFS_XATTR) += xattr.o xattr_id.o
squashfs-$(CONFIG_SQUASHFS_LZO) += lzo_wrapper.o
+squashfs-$(CONFIG_SQUASHFS_XZ) += xz_wrapper.o
diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
index 24af9ce9722f..482d78197811 100644
--- a/fs/squashfs/decompressor.c
+++ b/fs/squashfs/decompressor.c
@@ -46,6 +46,12 @@ static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = {
};
#endif
+#ifndef CONFIG_SQUASHFS_XZ
+static const struct squashfs_decompressor squashfs_xz_comp_ops = {
+ NULL, NULL, NULL, XZ_COMPRESSION, "xz", 0
+};
+#endif
+
static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
NULL, NULL, NULL, 0, "unknown", 0
};
@@ -58,6 +64,7 @@ static const struct squashfs_decompressor *decompressor[] = {
#else
&squashfs_lzo_unsupported_comp_ops,
#endif
+ &squashfs_xz_comp_ops,
&squashfs_unknown_comp_ops
};
diff --git a/fs/squashfs/decompressor.h b/fs/squashfs/decompressor.h
index 7425f80783f6..57e1acb4c6a9 100644
--- a/fs/squashfs/decompressor.h
+++ b/fs/squashfs/decompressor.h
@@ -52,4 +52,9 @@ static inline int squashfs_decompress(struct squashfs_sb_info *msblk,
return msblk->decompressor->decompress(msblk, buffer, bh, b, offset,
length, srclength, pages);
}
+
+#ifdef CONFIG_SQUASHFS_XZ
+extern const struct squashfs_decompressor squashfs_xz_comp_ops;
+#endif
+
#endif