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| author | H. Peter Anvin <hpa@zytor.com> | 2009-01-08 15:14:17 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-01-08 15:14:17 -0800 |
| commit | 889c92d21db40be0b7d22a59395060237895bb85 (patch) | |
| tree | db76e1e002e450cccc1b7a8119ad629eccc24da8 /init/do_mounts_rd.c | |
| parent | 6c11b12ac6f101732d43b5682f5b3ae4dda4205f (diff) | |
| download | lwn-889c92d21db40be0b7d22a59395060237895bb85.tar.gz lwn-889c92d21db40be0b7d22a59395060237895bb85.zip | |
bzip2/lzma: centralize format detection
Centralize the compression format detection to a common routine in the
lib directory, and use it for both initramfs and initrd.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'init/do_mounts_rd.c')
| -rw-r--r-- | init/do_mounts_rd.c | 38 |
1 files changed, 7 insertions, 31 deletions
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c index 9c9d7dbcf9ca..a06ed4f92e0e 100644 --- a/init/do_mounts_rd.c +++ b/init/do_mounts_rd.c @@ -12,9 +12,6 @@ #include <linux/decompress/generic.h> -#include <linux/decompress/bunzip2.h> -#include <linux/decompress/unlzma.h> -#include <linux/decompress/inflate.h> int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */ @@ -49,24 +46,6 @@ static int __init crd_load(int in_fd, int out_fd, decompress_fn deco); * cramfs * gzip */ -static const struct compress_format { - unsigned char magic[2]; - const char *name; - decompress_fn decompressor; -} compressed_formats[] = { -#ifdef CONFIG_RD_GZIP - { {037, 0213}, "gzip", gunzip }, - { {037, 0236}, "gzip", gunzip }, -#endif -#ifdef CONFIG_RD_BZIP2 - { {0x42, 0x5a}, "bzip2", bunzip2 }, -#endif -#ifdef CONFIG_RD_LZMA - { {0x5d, 0x00}, "lzma", unlzma }, -#endif - { {0, 0}, NULL, NULL } -}; - static int __init identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) { @@ -77,7 +56,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) struct cramfs_super *cramfsb; int nblocks = -1; unsigned char *buf; - const struct compress_format *cf; + const char *compress_name; buf = kmalloc(size, GFP_KERNEL); if (!buf) @@ -95,15 +74,12 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) sys_lseek(fd, start_block * BLOCK_SIZE, 0); sys_read(fd, buf, size); - for (cf = compressed_formats; cf->decompressor; cf++) { - if (buf[0] == cf->magic[0] && buf[1] == cf->magic[1]) { - printk(KERN_NOTICE - "RAMDISK: %s image found at block %d\n", - cf->name, start_block); - *decompressor = cf->decompressor; - nblocks = 0; - goto done; - } + *decompressor = decompress_method(buf, size, &compress_name); + if (*decompressor) { + printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n", + compress_name, start_block); + nblocks = 0; + goto done; } /* romfs is at block zero too */ |