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init/do_mounts_rd.c
8.37 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * Many of the syscalls used in this file expect some of the arguments * to be __user pointers not __kernel pointers. To limit the sparse * noise, turn off sparse checking for this file. */ #ifdef __CHECKER__ #undef __CHECKER__ #warning "Sparse checking disabled for this file" #endif |
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#include <linux/kernel.h> #include <linux/fs.h> #include <linux/minix_fs.h> #include <linux/ext2_fs.h> #include <linux/romfs_fs.h> |
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#include <uapi/linux/cramfs_fs.h> |
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#include <linux/initrd.h> #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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|
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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 */ static int __init prompt_ramdisk(char *str) { rd_prompt = simple_strtol(str,NULL,0) & 1; return 1; } __setup("prompt_ramdisk=", prompt_ramdisk); int __initdata rd_image_start; /* starting block # of image */ static int __init ramdisk_start_setup(char *str) { rd_image_start = simple_strtol(str,NULL,0); return 1; } __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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/* * This routine tries to find a RAM disk image to load, and returns the * number of blocks to read for a non-compressed image, 0 if the image * is a compressed image, and -1 if an image with the right magic * numbers could not be found. * * We currently check for the following magic numbers: |
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* minix * ext2 |
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* romfs * cramfs |
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* squashfs |
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* gzip |
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* bzip2 * lzma * xz * lzo * 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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{ const int size = 512; struct minix_super_block *minixsb; |
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struct romfs_super_block *romfsb; struct cramfs_super *cramfsb; |
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struct squashfs_super_block *squashfsb; |
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int nblocks = -1; 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; 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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* Read block 0 to test for compressed kernel |
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*/ sys_lseek(fd, start_block * BLOCK_SIZE, 0); 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 ", compress_name, start_block); |
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if (!*decompressor) |
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printk(KERN_EMERG "RAMDISK: %s decompressor not configured! ", |
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compress_name); |
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nblocks = 0; goto done; |
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} /* romfs is at block zero too */ if (romfsb->word0 == ROMSB_WORD0 && romfsb->word1 == ROMSB_WORD1) { printk(KERN_NOTICE "RAMDISK: romfs filesystem found at block %d ", start_block); nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; goto done; } if (cramfsb->magic == CRAMFS_MAGIC) { printk(KERN_NOTICE "RAMDISK: cramfs filesystem found at block %d ", start_block); nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; goto done; } |
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/* squashfs is at block zero too */ if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) { printk(KERN_NOTICE "RAMDISK: squashfs filesystem found at block %d ", start_block); nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; goto done; } |
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/* |
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* Read 512 bytes further to check if cramfs is padded */ sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0); sys_read(fd, buf, size); if (cramfsb->magic == CRAMFS_MAGIC) { printk(KERN_NOTICE "RAMDISK: cramfs filesystem found at block %d ", start_block); nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; goto done; } /* |
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* Read block 1 to test for minix and ext2 superblock */ sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); sys_read(fd, buf, size); /* Try minix */ if (minixsb->s_magic == MINIX_SUPER_MAGIC || minixsb->s_magic == MINIX_SUPER_MAGIC2) { printk(KERN_NOTICE "RAMDISK: Minix filesystem found at block %d ", start_block); nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; goto done; } /* Try ext2 */ |
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n = ext2_image_size(buf); if (n) { |
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printk(KERN_NOTICE "RAMDISK: ext2 filesystem found at block %d ", start_block); |
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nblocks = n; |
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goto done; } printk(KERN_NOTICE "RAMDISK: Couldn't find valid RAM disk image starting at %d. ", start_block); |
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done: sys_lseek(fd, start_block * BLOCK_SIZE, 0); kfree(buf); return nblocks; } int __init rd_load_image(char *from) { int res = 0; int in_fd, out_fd; unsigned long rd_blocks, devblocks; int nblocks, i, disk; char *buf = NULL; 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] = { '|' , '/' , '-' , '\\' }; #endif |
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out_fd = sys_open("/dev/ram", O_RDWR, 0); |
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if (out_fd < 0) goto out; in_fd = sys_open(from, O_RDONLY, 0); if (in_fd < 0) goto noclose_input; |
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nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor); |
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if (nblocks < 0) goto done; 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; } /* * NOTE NOTE: nblocks is not actually blocks but * the number of kibibytes of data to load into a ramdisk. |
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*/ if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0) rd_blocks = 0; else rd_blocks >>= 1; if (nblocks > rd_blocks) { printk("RAMDISK: image too big! (%dKiB/%ldKiB) ", nblocks, rd_blocks); goto done; } |
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/* * OK, time to copy in the data */ if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0) devblocks = 0; else devblocks >>= 1; if (strcmp(from, "/initrd.image") == 0) devblocks = nblocks; if (devblocks == 0) { printk(KERN_ERR "RAMDISK: could not determine device size "); goto done; } buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); |
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if (!buf) { |
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printk(KERN_ERR "RAMDISK: could not allocate buffer "); goto done; } printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ", nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); for (i = 0, disk = 1; i < nblocks; i++) { if (i && (i % devblocks == 0)) { printk("done disk #%d. ", disk++); rotate = 0; if (sys_close(in_fd)) { printk("Error closing the disk. "); goto noclose_input; } change_floppy("disk #%d", disk); in_fd = sys_open(from, O_RDONLY, 0); if (in_fd < 0) { printk("Error opening disk. "); goto noclose_input; } printk("Loading disk #%d... ", disk); } sys_read(in_fd, buf, BLOCK_SIZE); 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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pr_cont("%c\b", rotator[rotate & 0x3]); |
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rotate++; } #endif } printk("done. "); successful_load: res = 1; done: sys_close(in_fd); noclose_input: sys_close(out_fd); out: kfree(buf); |
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sys_unlink("/dev/ram"); |
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return res; } int __init rd_load_disk(int n) { if (rd_prompt) change_floppy("root floppy disk to be loaded into RAM disk"); |
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create_dev("/dev/root", ROOT_DEV); create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n)); |
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return rd_load_image("/dev/root"); } |
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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 long __init compr_fill(void *buf, unsigned long len) |
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{ |
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long r = sys_read(crd_infd, buf, len); |
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if (r < 0) printk(KERN_ERR "RAMDISK: error while reading compressed data"); else if (r == 0) printk(KERN_ERR "RAMDISK: EOF while reading compressed data"); return r; |
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} |
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static long __init compr_flush(void *window, unsigned long outcnt) |
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{ |
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long written = sys_write(crd_outfd, window, outcnt); |
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if (written != outcnt) { if (decompress_error == 0) printk(KERN_ERR |
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"RAMDISK: incomplete write (%ld != %ld) ", |
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written, outcnt); decompress_error = 1; return -1; } return outcnt; |
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} static void __init error(char *x) { printk(KERN_ERR "%s ", x); 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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{ int result; |
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crd_infd = in_fd; crd_outfd = out_fd; |
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if (!deco) { pr_emerg("Invalid ramdisk decompression routine. " "Select appropriate config option. "); panic("Could not decompress initial ramdisk image."); } |
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result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error); if (decompress_error) |
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result = 1; |
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return result; } |