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| author | Phillip Lougher <phillip@lougher.demon.co.uk> | 2010-12-09 05:08:31 +0300 |
|---|---|---|
| committer | Phillip Lougher <phillip@lougher.demon.co.uk> | 2011-01-14 00:16:52 +0300 |
| commit | 7a43ae523744c01b6187013e781f44c2281c579c (patch) | |
| tree | 7f122fb883ef7cd86f08f90b770e03cae601efd3 | |
| parent | 81bb8debd0d570dc67dc1e9d8b612632cb941893 (diff) | |
| download | linux-7a43ae523744c01b6187013e781f44c2281c579c.tar.xz | |
Squashfs: Add XZ compression configuration option
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
| -rw-r--r-- | fs/squashfs/Kconfig | 15 | ||||
| -rw-r--r-- | fs/squashfs/Makefile | 1 | ||||
| -rw-r--r-- | fs/squashfs/decompressor.c | 7 | ||||
| -rw-r--r-- | fs/squashfs/decompressor.h | 5 |
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 |