Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus

91d44d99 · Linus Torvalds <[email protected]> · 2011-07-25 22:50:35 -07:00

* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus:
  Squashfs: Make ZLIB compression support optional
  Squashfs: Update documentation for XZ and add squashfs-tools devel tree

Commit: 91d44d99992ff2587104df5760bfffbb3564b3c2
Parents: 2dad3206 · cc6d3497

Merge commit. Changes below are compared with the first parent: 2dad3206.

Changes

6 files changed · +28 −6

File	Status	Add	Del	Content
Documentation/filesystems/squashfs.txt	modified	+3	−1	View file
fs/squashfs/Kconfig	modified	+13	−1	View file
fs/squashfs/Makefile	modified	+2	−1	View file
fs/squashfs/decompressor.c	modified	+6	−0	View file
fs/squashfs/decompressor.h	modified	+4	−0	View file
fs/squashfs/squashfs.h	modified	+0	−3	View file

Documentation/filesystems/squashfs.txt

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diff --git a/Documentation/filesystems/squashfs.txt b/Documentation/filesystems/squashfs.txt
index d4d4146..7db3ebd 100644
--- a/Documentation/filesystems/squashfs.txt
+++ b/Documentation/filesystems/squashfs.txt
@@ -2,7 +2,7 @@ SQUASHFS 4.0 FILESYSTEM
 =======================
 
 Squashfs is a compressed read-only filesystem for Linux.
-It uses zlib/lzo compression to compress files, inodes and directories.
+It uses zlib/lzo/xz compression to compress 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 1Mbytes (default block size 128K).
@@ -55,6 +55,8 @@ create populated squashfs filesystems.  This and other squashfs utilities
 can be obtained from http://www.squashfs.org.  Usage instructions can be
 obtained from this site also.
 
+The squashfs-tools development tree is now located on kernel.org
+	git://git.kernel.org/pub/scm/fs/squashfs/squashfs-tools.git
 
 3. SQUASHFS FILESYSTEM DESIGN
 -----------------------------

fs/squashfs/Kconfig

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diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
index 7797218..1360d4f 100644
--- a/fs/squashfs/Kconfig
+++ b/fs/squashfs/Kconfig
@@ -1,7 +1,6 @@
 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
@@ -36,6 +35,19 @@ config SQUASHFS_XATTR
 
 	  If unsure, say N.
 
+config SQUASHFS_ZLIB
+	bool "Include support for ZLIB compressed file systems"
+	depends on SQUASHFS
+	select ZLIB_INFLATE
+	default y
+	help
+	  ZLIB compression is the standard compression used by Squashfs
+	  file systems.  It offers a good trade-off between compression
+	  achieved and the amount of CPU time and memory necessary to
+	  compress and decompress.
+
+	  If unsure, say Y.
+
 config SQUASHFS_LZO
 	bool "Include support for LZO compressed file systems"
 	depends on SQUASHFS

fs/squashfs/Makefile

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diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
index cecf2be..110b047 100644
--- a/fs/squashfs/Makefile
+++ b/fs/squashfs/Makefile
@@ -4,7 +4,8 @@
 
 obj-$(CONFIG_SQUASHFS) += squashfs.o
 squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
-squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
+squashfs-y += namei.o super.o symlink.o decompressor.o
 squashfs-$(CONFIG_SQUASHFS_XATTR) += xattr.o xattr_id.o
 squashfs-$(CONFIG_SQUASHFS_LZO) += lzo_wrapper.o
 squashfs-$(CONFIG_SQUASHFS_XZ) += xz_wrapper.o
+squashfs-$(CONFIG_SQUASHFS_ZLIB) += zlib_wrapper.o

fs/squashfs/decompressor.c

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diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
index 9f1b0bb..3f6271d 100644
--- a/fs/squashfs/decompressor.c
+++ b/fs/squashfs/decompressor.c
@@ -52,6 +52,12 @@ static const struct squashfs_decompressor squashfs_xz_comp_ops = {
 };
 #endif
 
+#ifndef CONFIG_SQUASHFS_ZLIB
+static const struct squashfs_decompressor squashfs_zlib_comp_ops = {
+	NULL, NULL, NULL, ZLIB_COMPRESSION, "zlib", 0
+};
+#endif
+
 static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
 	NULL, NULL, NULL, 0, "unknown", 0
 };

fs/squashfs/decompressor.h

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diff --git a/fs/squashfs/decompressor.h b/fs/squashfs/decompressor.h
index 8ba70cf..330073e 100644
--- a/fs/squashfs/decompressor.h
+++ b/fs/squashfs/decompressor.h
@@ -56,4 +56,8 @@ extern const struct squashfs_decompressor squashfs_xz_comp_ops;
 extern const struct squashfs_decompressor squashfs_lzo_comp_ops;
 #endif
 
+#ifdef CONFIG_SQUASHFS_ZLIB
+extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
+#endif
+
 #endif

fs/squashfs/squashfs.h

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diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
index e3be6a7..d126651 100644
--- a/fs/squashfs/squashfs.h
+++ b/fs/squashfs/squashfs.h
@@ -97,6 +97,3 @@ extern const struct inode_operations squashfs_symlink_inode_ops;
 
 /* xattr.c */
 extern const struct xattr_handler *squashfs_xattr_handlers[];
-
-/* zlib_wrapper.c */
-extern const struct squashfs_decompressor squashfs_zlib_comp_ops;