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![P J P](/assets/img/avatar_default.png)
Make menuconfig allows one to choose compression format of an initial ramdisk image. But this choice does not result in duly compressed ramdisk image. Because - $ make install - does not pass on the selected compression choice to the dracut(8) tool, which creates the initramfs file. dracut(8) generates the image with the default compression, ie. gzip(1). This patch exports the selected compression option to a sub-shell environment, so that it could be used by dracut(8) tool to generate appropriately compressed initramfs images. There isn't a straightforward way to pass on options to dracut(8) via positional parameters. Because it is indirectly invoked at the end of a $ make install sequence. # make install -> arch/$arch/boot/Makefile -> arch/$arch/boot/install.sh -> /sbing/installkernel ... -> /sbin/new-kernel-pkg ... -> /sbin/dracut ... Signed-off-by: P J P <ppandit@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
361 lines
8.6 KiB
C
361 lines
8.6 KiB
C
/*
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* Many of the syscalls used in this file expect some of the arguments
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* to be __user pointers not __kernel pointers. To limit the sparse
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* noise, turn off sparse checking for this file.
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*/
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#ifdef __CHECKER__
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#undef __CHECKER__
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#warning "Sparse checking disabled for this file"
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#endif
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/minix_fs.h>
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#include <linux/ext2_fs.h>
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#include <linux/romfs_fs.h>
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#include <linux/cramfs_fs.h>
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#include <linux/initrd.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include "do_mounts.h"
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#include "../fs/squashfs/squashfs_fs.h"
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#include <linux/decompress/generic.h>
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int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */
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static int __init prompt_ramdisk(char *str)
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{
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rd_prompt = simple_strtol(str,NULL,0) & 1;
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return 1;
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}
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__setup("prompt_ramdisk=", prompt_ramdisk);
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int __initdata rd_image_start; /* starting block # of image */
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static int __init ramdisk_start_setup(char *str)
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{
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rd_image_start = simple_strtol(str,NULL,0);
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return 1;
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}
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__setup("ramdisk_start=", ramdisk_start_setup);
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static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
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/*
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* This routine tries to find a RAM disk image to load, and returns the
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* number of blocks to read for a non-compressed image, 0 if the image
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* is a compressed image, and -1 if an image with the right magic
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* numbers could not be found.
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*
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* We currently check for the following magic numbers:
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* minix
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* ext2
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* romfs
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* cramfs
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* squashfs
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* gzip
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* bzip2
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* lzma
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* xz
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* lzo
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* lz4
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*/
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static int __init
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identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
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{
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const int size = 512;
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struct minix_super_block *minixsb;
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struct romfs_super_block *romfsb;
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struct cramfs_super *cramfsb;
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struct squashfs_super_block *squashfsb;
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int nblocks = -1;
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unsigned char *buf;
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const char *compress_name;
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unsigned long n;
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buf = kmalloc(size, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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minixsb = (struct minix_super_block *) buf;
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romfsb = (struct romfs_super_block *) buf;
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cramfsb = (struct cramfs_super *) buf;
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squashfsb = (struct squashfs_super_block *) buf;
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memset(buf, 0xe5, size);
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/*
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* Read block 0 to test for compressed kernel
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*/
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sys_lseek(fd, start_block * BLOCK_SIZE, 0);
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sys_read(fd, buf, size);
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*decompressor = decompress_method(buf, size, &compress_name);
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if (compress_name) {
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printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
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compress_name, start_block);
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if (!*decompressor)
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printk(KERN_EMERG
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"RAMDISK: %s decompressor not configured!\n",
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compress_name);
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nblocks = 0;
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goto done;
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}
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/* romfs is at block zero too */
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if (romfsb->word0 == ROMSB_WORD0 &&
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romfsb->word1 == ROMSB_WORD1) {
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printk(KERN_NOTICE
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"RAMDISK: romfs filesystem found at block %d\n",
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start_block);
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nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
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goto done;
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}
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if (cramfsb->magic == CRAMFS_MAGIC) {
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printk(KERN_NOTICE
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"RAMDISK: cramfs filesystem found at block %d\n",
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start_block);
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nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
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goto done;
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}
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/* squashfs is at block zero too */
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if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
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printk(KERN_NOTICE
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"RAMDISK: squashfs filesystem found at block %d\n",
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start_block);
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nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
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>> BLOCK_SIZE_BITS;
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goto done;
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}
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/*
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* Read 512 bytes further to check if cramfs is padded
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*/
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sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
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sys_read(fd, buf, size);
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if (cramfsb->magic == CRAMFS_MAGIC) {
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printk(KERN_NOTICE
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"RAMDISK: cramfs filesystem found at block %d\n",
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start_block);
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nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
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goto done;
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}
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/*
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* Read block 1 to test for minix and ext2 superblock
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*/
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sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
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sys_read(fd, buf, size);
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/* Try minix */
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if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
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minixsb->s_magic == MINIX_SUPER_MAGIC2) {
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printk(KERN_NOTICE
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"RAMDISK: Minix filesystem found at block %d\n",
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start_block);
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nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
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goto done;
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}
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/* Try ext2 */
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n = ext2_image_size(buf);
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if (n) {
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printk(KERN_NOTICE
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"RAMDISK: ext2 filesystem found at block %d\n",
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start_block);
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nblocks = n;
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goto done;
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}
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printk(KERN_NOTICE
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"RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
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start_block);
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done:
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sys_lseek(fd, start_block * BLOCK_SIZE, 0);
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kfree(buf);
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return nblocks;
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}
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int __init rd_load_image(char *from)
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{
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int res = 0;
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int in_fd, out_fd;
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unsigned long rd_blocks, devblocks;
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int nblocks, i, disk;
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char *buf = NULL;
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unsigned short rotate = 0;
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decompress_fn decompressor = NULL;
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#if !defined(CONFIG_S390)
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char rotator[4] = { '|' , '/' , '-' , '\\' };
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#endif
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out_fd = sys_open("/dev/ram", O_RDWR, 0);
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if (out_fd < 0)
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goto out;
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in_fd = sys_open(from, O_RDONLY, 0);
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if (in_fd < 0)
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goto noclose_input;
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nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
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if (nblocks < 0)
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goto done;
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if (nblocks == 0) {
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if (crd_load(in_fd, out_fd, decompressor) == 0)
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goto successful_load;
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goto done;
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}
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/*
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* NOTE NOTE: nblocks is not actually blocks but
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* the number of kibibytes of data to load into a ramdisk.
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* So any ramdisk block size that is a multiple of 1KiB should
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* work when the appropriate ramdisk_blocksize is specified
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* on the command line.
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*
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* The default ramdisk_blocksize is 1KiB and it is generally
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* silly to use anything else, so make sure to use 1KiB
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* blocksize while generating ext2fs ramdisk-images.
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*/
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if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
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rd_blocks = 0;
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else
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rd_blocks >>= 1;
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if (nblocks > rd_blocks) {
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printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
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nblocks, rd_blocks);
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goto done;
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}
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/*
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* OK, time to copy in the data
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*/
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if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
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devblocks = 0;
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else
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devblocks >>= 1;
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if (strcmp(from, "/initrd.image") == 0)
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devblocks = nblocks;
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if (devblocks == 0) {
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printk(KERN_ERR "RAMDISK: could not determine device size\n");
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goto done;
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}
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buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
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if (!buf) {
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printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
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goto done;
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}
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printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
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nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
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for (i = 0, disk = 1; i < nblocks; i++) {
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if (i && (i % devblocks == 0)) {
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printk("done disk #%d.\n", disk++);
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rotate = 0;
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if (sys_close(in_fd)) {
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printk("Error closing the disk.\n");
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goto noclose_input;
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}
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change_floppy("disk #%d", disk);
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in_fd = sys_open(from, O_RDONLY, 0);
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if (in_fd < 0) {
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printk("Error opening disk.\n");
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goto noclose_input;
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}
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printk("Loading disk #%d... ", disk);
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}
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sys_read(in_fd, buf, BLOCK_SIZE);
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sys_write(out_fd, buf, BLOCK_SIZE);
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#if !defined(CONFIG_S390)
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if (!(i % 16)) {
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printk("%c\b", rotator[rotate & 0x3]);
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rotate++;
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}
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#endif
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}
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printk("done.\n");
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successful_load:
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res = 1;
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done:
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sys_close(in_fd);
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noclose_input:
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sys_close(out_fd);
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out:
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kfree(buf);
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sys_unlink("/dev/ram");
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return res;
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}
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int __init rd_load_disk(int n)
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{
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if (rd_prompt)
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change_floppy("root floppy disk to be loaded into RAM disk");
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create_dev("/dev/root", ROOT_DEV);
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create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
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return rd_load_image("/dev/root");
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}
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static int exit_code;
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static int decompress_error;
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static int crd_infd, crd_outfd;
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static int __init compr_fill(void *buf, unsigned int len)
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{
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int r = sys_read(crd_infd, buf, len);
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if (r < 0)
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printk(KERN_ERR "RAMDISK: error while reading compressed data");
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else if (r == 0)
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printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
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return r;
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}
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static int __init compr_flush(void *window, unsigned int outcnt)
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{
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int written = sys_write(crd_outfd, window, outcnt);
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if (written != outcnt) {
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if (decompress_error == 0)
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printk(KERN_ERR
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"RAMDISK: incomplete write (%d != %d)\n",
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written, outcnt);
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decompress_error = 1;
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return -1;
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}
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return outcnt;
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}
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static void __init error(char *x)
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{
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printk(KERN_ERR "%s\n", x);
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exit_code = 1;
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decompress_error = 1;
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}
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static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
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{
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int result;
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crd_infd = in_fd;
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crd_outfd = out_fd;
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if (!deco) {
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pr_emerg("Invalid ramdisk decompression routine. "
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"Select appropriate config option.\n");
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panic("Could not decompress initial ramdisk image.");
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}
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result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
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if (decompress_error)
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result = 1;
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return result;
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}
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