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linux/3.2: add XZ decompression support to ubifs

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SVN-Revision: 30793
This commit is contained in:
Gabor Juhos 2012-03-02 23:08:59 +00:00
parent b8bc1eca45
commit 5202e9908b
1 changed files with 94 additions and 0 deletions
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94
target/linux/generic/patches-3.2/541-ubifs-xz-decompression-support.patch Normal file
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@ -0,0 +1,94 @@
--- a/fs/ubifs/Kconfig
+++ b/fs/ubifs/Kconfig
@@ -5,8 +5,10 @@ config UBIFS_FS
select CRYPTO if UBIFS_FS_ADVANCED_COMPR
select CRYPTO if UBIFS_FS_LZO
select CRYPTO if UBIFS_FS_ZLIB
+ select CRYPTO if UBIFS_FS_XZ
select CRYPTO_LZO if UBIFS_FS_LZO
select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
+ select CRYPTO_XZ if UBIFS_FS_XZ
depends on MTD_UBI
help
UBIFS is a file system for flash devices which works on top of UBI.
@@ -42,6 +44,14 @@ config UBIFS_FS_ZLIB
help
Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
+config UBIFS_FS_XZ
+ bool "XZ decompression support" if UBIFS_FS_ADVANCED_COMPR
+ depends on UBIFS_FS
+ default y
+ help
+ XZ compresses better the ZLIB but it is slower.
+ Say 'Y' if unsure.
+
# Debugging-related stuff
config UBIFS_FS_DEBUG
bool "Enable debugging support"
--- a/fs/ubifs/compress.c
+++ b/fs/ubifs/compress.c
@@ -71,6 +71,24 @@ static struct ubifs_compressor zlib_comp
};
#endif
+#ifdef CONFIG_UBIFS_FS_XZ
+static DEFINE_MUTEX(xz_enc_mutex);
+static DEFINE_MUTEX(xz_dec_mutex);
+
+static struct ubifs_compressor xz_compr = {
+ .compr_type = UBIFS_COMPR_XZ,
+ .comp_mutex = &xz_enc_mutex,
+ .decomp_mutex = &xz_dec_mutex,
+ .name = "xz",
+ .capi_name = "xz",
+};
+#else
+static struct ubifs_compressor zlib_compr = {
+ .compr_type = UBIFS_COMPR_XZ,
+ .name = "xz",
+};
+#endif
+
/* All UBIFS compressors */
struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
@@ -233,9 +251,15 @@ int __init ubifs_compressors_init(void)
if (err)
goto out_lzo;
+ err = compr_init(&xz_compr);
+ if (err)
+ goto out_zlib;
+
ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
return 0;
+out_zlib:
+ compr_exit(&zlib_compr);
out_lzo:
compr_exit(&lzo_compr);
return err;
@@ -248,4 +272,5 @@ void ubifs_compressors_exit(void)
{
compr_exit(&lzo_compr);
compr_exit(&zlib_compr);
+ compr_exit(&xz_compr);
}
--- a/fs/ubifs/ubifs-media.h
+++ b/fs/ubifs/ubifs-media.h
@@ -332,12 +332,14 @@ enum {
* UBIFS_COMPR_NONE: no compression
* UBIFS_COMPR_LZO: LZO compression
* UBIFS_COMPR_ZLIB: ZLIB compression
+ * UBIFS_COMPR_XZ: XZ compression
* UBIFS_COMPR_TYPES_CNT: count of supported compression types
*/
enum {
UBIFS_COMPR_NONE,
UBIFS_COMPR_LZO,
UBIFS_COMPR_ZLIB,
+ UBIFS_COMPR_XZ,
UBIFS_COMPR_TYPES_CNT,
};