/* * ramdisk.c - Multiple RAM disk driver - gzip-loading version - v. 0.8 beta. * * (C) Chad Page, Theodore Ts'o, et. al, 1995. * * This RAM disk is designed to have filesystems created on it and mounted * just like a regular floppy disk. * * It also does something suggested by Linus: use the buffer cache as the * RAM disk data. This makes it possible to dynamically allocate the RAM disk * buffer - with some consequences I have to deal with as I write this. * * This code is based on the original ramdisk.c, written mostly by * Theodore Ts'o (TYT) in 1991. The code was largely rewritten by * Chad Page to use the buffer cache to store the RAM disk data in * 1995; Theodore then took over the driver again, and cleaned it up * for inclusion in the mainline kernel. * * The original CRAMDISK code was written by Richard Lyons, and * adapted by Chad Page to use the new RAM disk interface. Theodore * Ts'o rewrote it so that both the compressed RAM disk loader and the * kernel decompressor uses the same inflate.c codebase. The RAM disk * loader now also loads into a dynamic (buffer cache based) RAM disk, * not the old static RAM disk. Support for the old static RAM disk has * been completely removed. * * Loadable module support added by Tom Dyas. * * Further cleanups by Chad Page (page0588@sundance.sjsu.edu): * Cosmetic changes in #ifdef MODULE, code movement, etc. * When the RAM disk module is removed, free the protected buffers * Default RAM disk size changed to 2.88 MB * * Added initrd: Werner Almesberger & Hans Lermen, Feb '96 * * 4/25/96 : Made RAM disk size a parameter (default is now 4 MB) * - Chad Page * * Add support for fs images split across >1 disk, Paul Gortmaker, Mar '98 * * Make block size and block size shift for RAM disks a global macro * and set blk_size for -ENOSPC, Werner Fink , Apr '99 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern void wait_for_keypress(void); /* * 35 has been officially registered as the RAMDISK major number, but * so is the original MAJOR number of 1. We're using 1 in * include/linux/major.h for now */ #define MAJOR_NR RAMDISK_MAJOR #include #include /* The RAM disk size is now a parameter */ #define NUM_RAMDISKS 16 /* This cannot be overridden (yet) */ #ifndef MODULE /* We don't have to load RAM disks or gunzip them in a module. */ #define RD_LOADER #define BUILD_CRAMDISK void rd_load(void); static int crd_load(struct file *fp, struct file *outfp); #ifdef CONFIG_BLK_DEV_INITRD static int initrd_users; #endif #endif /* Various static variables go here. Most are used only in the RAM disk code. */ static unsigned long rd_length[NUM_RAMDISKS]; /* Size of RAM disks in bytes */ static int rd_hardsec[NUM_RAMDISKS]; /* Size of real blocks in bytes */ static int rd_blocksizes[NUM_RAMDISKS]; /* Size of 1024 byte blocks :) */ static int rd_kbsize[NUM_RAMDISKS]; /* Size in blocks of 1024 bytes */ static devfs_handle_t devfs_handle; static struct block_device *rd_bdev[NUM_RAMDISKS];/* Protected device data */ /* * Parameters for the boot-loading of the RAM disk. These are set by * init/main.c (from arguments to the kernel command line) or from the * architecture-specific setup routine (from the stored boot sector * information). */ int rd_size = CONFIG_BLK_DEV_RAM_SIZE; /* Size of the RAM disks */ /* * It would be very desirable to have a soft-blocksize (that in the case * of the ramdisk driver is also the hardblocksize ;) of PAGE_SIZE because * doing that we'll achieve a far better MM footprint. Using a rd_blocksize of * BLOCK_SIZE in the worst case we'll make PAGE_SIZE/BLOCK_SIZE buffer-pages * unfreeable. With a rd_blocksize of PAGE_SIZE instead we are sure that only * 1 page will be protected. Depending on the size of the ramdisk you * may want to change the ramdisk blocksize to achieve a better or worse MM * behaviour. The default is still BLOCK_SIZE (needed by rd_load_image that * supposes the filesystem in the image uses a BLOCK_SIZE blocksize). */ int rd_blocksize = BLOCK_SIZE; /* blocksize of the RAM disks */ #ifndef MODULE int rd_doload; /* 1 = load RAM disk, 0 = don't load */ int rd_prompt = 1; /* 1 = prompt for RAM disk, 0 = don't prompt */ int rd_image_start; /* starting block # of image */ #ifdef CONFIG_BLK_DEV_INITRD unsigned long initrd_start, initrd_end; int mount_initrd = 1; /* zero if initrd should not be mounted */ int initrd_below_start_ok; static int __init no_initrd(char *str) { mount_initrd = 0; return 1; } __setup("noinitrd", no_initrd); #endif static int __init ramdisk_start_setup(char *str) { rd_image_start = simple_strtol(str,NULL,0); return 1; } static int __init load_ramdisk(char *str) { rd_doload = simple_strtol(str,NULL,0) & 3; return 1; } static int __init prompt_ramdisk(char *str) { rd_prompt = simple_strtol(str,NULL,0) & 1; return 1; } static int __init ramdisk_size(char *str) { rd_size = simple_strtol(str,NULL,0); return 1; } static int __init ramdisk_size2(char *str) { return ramdisk_size(str); } static int __init ramdisk_blocksize(char *str) { rd_blocksize = simple_strtol(str,NULL,0); return 1; } __setup("ramdisk_start=", ramdisk_start_setup); __setup("load_ramdisk=", load_ramdisk); __setup("prompt_ramdisk=", prompt_ramdisk); __setup("ramdisk=", ramdisk_size); __setup("ramdisk_size=", ramdisk_size2); __setup("ramdisk_blocksize=", ramdisk_blocksize); #endif /* * Copyright (C) 2000 Linus Torvalds. * 2000 Transmeta Corp. * aops copied from ramfs. */ static void ramdisk_updatepage(struct page * page, int need_kmap) { if (!Page_Uptodate(page)) { struct buffer_head *bh = page->buffers; void * address; if (need_kmap) kmap(page); address = page_address(page); if (bh) { struct buffer_head *tmp = bh; do { if (!buffer_uptodate(tmp)) { memset(address, 0, tmp->b_size); mark_buffer_uptodate(tmp, 1); } address += tmp->b_size; tmp = tmp->b_this_page; } while (tmp != bh); } else memset(address, 0, PAGE_CACHE_SIZE); if (need_kmap) kunmap(page); flush_dcache_page(page); SetPageUptodate(page); } } static int ramdisk_readpage(struct file *file, struct page * page) { ramdisk_updatepage(page, 1); UnlockPage(page); return 0; } static int ramdisk_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) { ramdisk_updatepage(page, 0); SetPageDirty(page); return 0; } static int ramdisk_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to) { return 0; } static struct address_space_operations ramdisk_aops = { readpage: ramdisk_readpage, writepage: fail_writepage, prepare_write: ramdisk_prepare_write, commit_write: ramdisk_commit_write, }; static int rd_blkdev_pagecache_IO(int rw, struct buffer_head * sbh, int minor) { struct address_space * mapping; unsigned long index; int offset, size, err; err = 0; mapping = rd_bdev[minor]->bd_inode->i_mapping; /* writing a buffer cache not uptodate must not clear it */ if (sbh->b_page->mapping == mapping) { if (rw == WRITE) { mark_buffer_uptodate(sbh, 1); SetPageDirty(sbh->b_page); } goto out; } index = sbh->b_rsector >> (PAGE_CACHE_SHIFT - 9); offset = (sbh->b_rsector << 9) & ~PAGE_CACHE_MASK; size = sbh->b_size; do { int count; struct page * page; char * src, * dst; count = PAGE_CACHE_SIZE - offset; if (count > size) count = size; size -= count; page = grab_cache_page(mapping, index); if (!page) { err = -ENOMEM; goto out; } ramdisk_updatepage(page, 1); index++; if (rw == READ) { src = kmap(page); src += offset; dst = bh_kmap(sbh); } else { dst = kmap(page); dst += offset; src = bh_kmap(sbh); } offset = 0; memcpy(dst, src, count); kunmap(page); bh_kunmap(sbh); if (rw == READ) { flush_dcache_page(page); } else { SetPageDirty(page); } UnlockPage(page); __free_page(page); } while (size); out: return err; } /* * Basically, my strategy here is to set up a buffer-head which can't be * deleted, and make that my Ramdisk. If the request is outside of the * allocated size, we must get rid of it... * * 19-JAN-1998 Richard Gooch Added devfs support * */ static int rd_make_request(request_queue_t * q, int rw, struct buffer_head *sbh) { unsigned int minor; unsigned long offset, len; minor = MINOR(sbh->b_rdev); if (minor >= NUM_RAMDISKS) goto fail; offset = sbh->b_rsector << 9; len = sbh->b_size; if ((offset + len) > rd_length[minor]) goto fail; if (rw==READA) rw=READ; if ((rw != READ) && (rw != WRITE)) { printk(KERN_INFO "RAMDISK: bad command: %d\n", rw); goto fail; } if (rd_blkdev_pagecache_IO(rw, sbh, minor)) goto fail; sbh->b_end_io(sbh,1); return 0; fail: buffer_IO_error(sbh); return 0; } static int rd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { int error = -EINVAL; unsigned int minor; if (!inode || !inode->i_rdev) goto out; minor = MINOR(inode->i_rdev); switch (cmd) { case BLKFLSBUF: if (!capable(CAP_SYS_ADMIN)) return -EACCES; /* special: we want to release the ramdisk memory, it's not like with the other blockdevices where this ioctl only flushes away the buffer cache. */ error = -EBUSY; down(&inode->i_bdev->bd_sem); if (inode->i_bdev->bd_openers <= 2) { truncate_inode_pages(inode->i_mapping, 0); error = 0; } up(&inode->i_bdev->bd_sem); invalidate_buffers(inode->i_rdev); break; case BLKGETSIZE: /* Return device size */ if (!arg) break; error = put_user(rd_kbsize[minor] << 1, (unsigned long *) arg); break; case BLKGETSIZE64: error = put_user((u64)rd_kbsize[minor]<<10, (u64*)arg); break; case BLKROSET: case BLKROGET: case BLKSSZGET: error = blk_ioctl(inode->i_rdev, cmd, arg); }; out: return error; } #ifdef CONFIG_BLK_DEV_INITRD static ssize_t initrd_read(struct file *file, char *buf, size_t count, loff_t *ppos) { int left; left = initrd_end - initrd_start - *ppos; if (count > left) count = left; if (count == 0) return 0; copy_to_user(buf, (char *)initrd_start + *ppos, count); *ppos += count; return count; } static int initrd_release(struct inode *inode,struct file *file) { extern void free_initrd_mem(unsigned long, unsigned long); lock_kernel(); if (!--initrd_users) { free_initrd_mem(initrd_start, initrd_end); initrd_start = 0; } unlock_kernel(); blkdev_put(inode->i_bdev, BDEV_FILE); return 0; } static struct file_operations initrd_fops = { read: initrd_read, release: initrd_release, }; #endif static int rd_open(struct inode * inode, struct file * filp) { int unit = DEVICE_NR(inode->i_rdev); #ifdef CONFIG_BLK_DEV_INITRD if (unit == INITRD_MINOR) { if (!initrd_start) return -ENODEV; initrd_users++; filp->f_op = &initrd_fops; return 0; } #endif if (unit >= NUM_RAMDISKS) return -ENXIO; /* * Immunize device against invalidate_buffers() and prune_icache(). */ if (rd_bdev[unit] == NULL) { rd_bdev[unit] = bdget(kdev_t_to_nr(inode->i_rdev)); rd_bdev[unit]->bd_openers++; rd_bdev[unit]->bd_inode->i_mapping->a_ops = &ramdisk_aops; } return 0; } static struct block_device_operations rd_bd_op = { owner: THIS_MODULE, open: rd_open, ioctl: rd_ioctl, }; #ifdef MODULE /* Before freeing the module, invalidate all of the protected buffers! */ static void __exit rd_cleanup (void) { int i; for (i = 0 ; i < NUM_RAMDISKS; i++) { struct block_device *bdev = rd_bdev[i]; rd_bdev[i] = NULL; if (bdev) blkdev_put(bdev, BDEV_FILE); destroy_buffers(MKDEV(MAJOR_NR, i)); } devfs_unregister (devfs_handle); unregister_blkdev( MAJOR_NR, "ramdisk" ); hardsect_size[MAJOR_NR] = NULL; blksize_size[MAJOR_NR] = NULL; blk_size[MAJOR_NR] = NULL; } #endif /* This is the registration and initialization section of the RAM disk driver */ int __init rd_init (void) { int i; if (rd_blocksize > PAGE_SIZE || rd_blocksize < 512 || (rd_blocksize & (rd_blocksize-1))) { printk("RAMDISK: wrong blocksize %d, reverting to defaults\n", rd_blocksize); rd_blocksize = BLOCK_SIZE; } if (register_blkdev(MAJOR_NR, "ramdisk", &rd_bd_op)) { printk("RAMDISK: Could not get major %d", MAJOR_NR); return -EIO; } blk_queue_make_request(BLK_DEFAULT_QUEUE(MAJOR_NR), &rd_make_request); for (i = 0; i < NUM_RAMDISKS; i++) { /* rd_size is given in kB */ rd_length[i] = rd_size << 10; rd_hardsec[i] = rd_blocksize; rd_blocksizes[i] = rd_blocksize; rd_kbsize[i] = rd_size; } devfs_handle = devfs_mk_dir (NULL, "rd", NULL); devfs_register_series (devfs_handle, "%u", NUM_RAMDISKS, DEVFS_FL_DEFAULT, MAJOR_NR, 0, S_IFBLK | S_IRUSR | S_IWUSR, &rd_bd_op, NULL); for (i = 0; i < NUM_RAMDISKS; i++) register_disk(NULL, MKDEV(MAJOR_NR,i), 1, &rd_bd_op, rd_size<<1); #ifdef CONFIG_BLK_DEV_INITRD /* We ought to separate initrd operations here */ register_disk(NULL, MKDEV(MAJOR_NR,INITRD_MINOR), 1, &rd_bd_op, rd_size<<1); #endif hardsect_size[MAJOR_NR] = rd_hardsec; /* Size of the RAM disk blocks */ blksize_size[MAJOR_NR] = rd_blocksizes; /* Avoid set_blocksize() check */ blk_size[MAJOR_NR] = rd_kbsize; /* Size of the RAM disk in kB */ /* rd_size is given in kB */ printk("RAMDISK driver initialized: " "%d RAM disks of %dK size %d blocksize\n", NUM_RAMDISKS, rd_size, rd_blocksize); return 0; } #ifdef MODULE module_init(rd_init); module_exit(rd_cleanup); #endif /* loadable module support */ MODULE_PARM (rd_size, "1i"); MODULE_PARM_DESC(rd_size, "Size of each RAM disk in kbytes."); MODULE_PARM (rd_blocksize, "i"); MODULE_PARM_DESC(rd_blocksize, "Blocksize of each RAM disk in bytes."); MODULE_LICENSE("GPL"); /* End of non-loading portions of the RAM disk driver */ #ifdef RD_LOADER /* * 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: * minix * ext2 * romfs * gzip */ static int __init identify_ramdisk_image(kdev_t device, struct file *fp, int start_block) { const int size = 512; struct minix_super_block *minixsb; struct ext2_super_block *ext2sb; struct romfs_super_block *romfsb; int nblocks = -1; unsigned char *buf; buf = kmalloc(size, GFP_KERNEL); if (buf == 0) return -1; minixsb = (struct minix_super_block *) buf; ext2sb = (struct ext2_super_block *) buf; romfsb = (struct romfs_super_block *) buf; memset(buf, 0xe5, size); /* * Read block 0 to test for gzipped kernel */ if (fp->f_op->llseek) fp->f_op->llseek(fp, start_block * BLOCK_SIZE, 0); fp->f_pos = start_block * BLOCK_SIZE; fp->f_op->read(fp, buf, size, &fp->f_pos); /* * If it matches the gzip magic numbers, return -1 */ if (buf[0] == 037 && ((buf[1] == 0213) || (buf[1] == 0236))) { printk(KERN_NOTICE "RAMDISK: Compressed image found at block %d\n", start_block); nblocks = 0; goto done; } /* 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\n", start_block); nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; goto done; } /* * Read block 1 to test for minix and ext2 superblock */ if (fp->f_op->llseek) fp->f_op->llseek(fp, (start_block+1) * BLOCK_SIZE, 0); fp->f_pos = (start_block+1) * BLOCK_SIZE; fp->f_op->read(fp, buf, size, &fp->f_pos); /* 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\n", start_block); nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; goto done; } /* Try ext2 */ if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) { printk(KERN_NOTICE "RAMDISK: ext2 filesystem found at block %d\n", start_block); nblocks = le32_to_cpu(ext2sb->s_blocks_count); goto done; } printk(KERN_NOTICE "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", start_block); done: if (fp->f_op->llseek) fp->f_op->llseek(fp, start_block * BLOCK_SIZE, 0); fp->f_pos = start_block * BLOCK_SIZE; kfree(buf); return nblocks; } /* * This routine loads in the RAM disk image. */ static void __init rd_load_image(kdev_t device, int offset, int unit) { struct inode *inode, *out_inode; struct file infile, outfile; struct dentry in_dentry, out_dentry; mm_segment_t fs; kdev_t ram_device; int nblocks, i; char *buf; unsigned short rotate = 0; unsigned short devblocks = 0; #if !defined(CONFIG_ARCH_S390) && !defined(CONFIG_PPC_ISERIES) char rotator[4] = { '|' , '/' , '-' , '\\' }; #endif ram_device = MKDEV(MAJOR_NR, unit); if ((inode = get_empty_inode()) == NULL) return; memset(&infile, 0, sizeof(infile)); memset(&in_dentry, 0, sizeof(in_dentry)); infile.f_mode = 1; /* read only */ infile.f_dentry = &in_dentry; in_dentry.d_inode = inode; infile.f_op = &def_blk_fops; init_special_inode(inode, S_IFBLK | S_IRUSR, kdev_t_to_nr(device)); if ((out_inode = get_empty_inode()) == NULL) goto free_inode; memset(&outfile, 0, sizeof(outfile)); memset(&out_dentry, 0, sizeof(out_dentry)); outfile.f_mode = 3; /* read/write */ outfile.f_dentry = &out_dentry; out_dentry.d_inode = out_inode; outfile.f_op = &def_blk_fops; init_special_inode(out_inode, S_IFBLK | S_IRUSR | S_IWUSR, kdev_t_to_nr(ram_device)); if (blkdev_open(inode, &infile) != 0) { iput(out_inode); goto free_inode; } if (blkdev_open(out_inode, &outfile) != 0) goto free_inodes; fs = get_fs(); set_fs(KERNEL_DS); nblocks = identify_ramdisk_image(device, &infile, offset); if (nblocks < 0) goto done; if (nblocks == 0) { #ifdef BUILD_CRAMDISK if (crd_load(&infile, &outfile) == 0) goto successful_load; #else printk(KERN_NOTICE "RAMDISK: Kernel does not support compressed " "RAM disk images\n"); #endif goto done; } /* * NOTE NOTE: nblocks suppose that the blocksize is BLOCK_SIZE, so * rd_load_image will work only with filesystem BLOCK_SIZE wide! * So make sure to use 1k blocksize while generating ext2fs * ramdisk-images. */ if (nblocks > (rd_length[unit] >> BLOCK_SIZE_BITS)) { printk("RAMDISK: image too big! (%d/%ld blocks)\n", nblocks, rd_length[unit] >> BLOCK_SIZE_BITS); goto done; } /* * OK, time to copy in the data */ buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); if (buf == 0) { printk(KERN_ERR "RAMDISK: could not allocate buffer\n"); goto done; } if (blk_size[MAJOR(device)]) devblocks = blk_size[MAJOR(device)][MINOR(device)]; #ifdef CONFIG_BLK_DEV_INITRD if (MAJOR(device) == MAJOR_NR && MINOR(device) == INITRD_MINOR) devblocks = nblocks; #endif if (devblocks == 0) { printk(KERN_ERR "RAMDISK: could not determine device size\n"); goto done; } printk(KERN_NOTICE "RAMDISK: Loading %d blocks [%d disk%s] into ram disk... ", nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); for (i=0; i < nblocks; i++) { if (i && (i % devblocks == 0)) { printk("done disk #%d.\n", i/devblocks); rotate = 0; if (infile.f_op->release(inode, &infile) != 0) { printk("Error closing the disk.\n"); goto noclose_input; } printk("Please insert disk #%d and press ENTER\n", i/devblocks+1); wait_for_keypress(); if (blkdev_open(inode, &infile) != 0) { printk("Error opening disk.\n"); goto noclose_input; } infile.f_pos = 0; printk("Loading disk #%d... ", i/devblocks+1); } infile.f_op->read(&infile, buf, BLOCK_SIZE, &infile.f_pos); outfile.f_op->write(&outfile, buf, BLOCK_SIZE, &outfile.f_pos); #if !defined(CONFIG_ARCH_S390) && !defined(CONFIG_PPC_ISERIES) if (!(i % 16)) { printk("%c\b", rotator[rotate & 0x3]); rotate++; } #endif } printk("done.\n"); kfree(buf); successful_load: ROOT_DEV = MKDEV(MAJOR_NR, unit); if (ROOT_DEVICE_NAME != NULL) strcpy (ROOT_DEVICE_NAME, "rd/0"); done: infile.f_op->release(inode, &infile); noclose_input: blkdev_close(out_inode, &outfile); iput(inode); iput(out_inode); set_fs(fs); return; free_inodes: /* free inodes on error */ iput(out_inode); infile.f_op->release(inode, &infile); free_inode: iput(inode); } #ifdef CONFIG_MAC_FLOPPY int swim3_fd_eject(int devnum); #endif static void __init rd_load_disk(int n) { if (rd_doload == 0) return; if (MAJOR(ROOT_DEV) != FLOPPY_MAJOR #ifdef CONFIG_BLK_DEV_INITRD && MAJOR(real_root_dev) != FLOPPY_MAJOR #endif ) return; if (rd_prompt) { #ifdef CONFIG_BLK_DEV_FD floppy_eject(); #endif #ifdef CONFIG_MAC_FLOPPY if(MAJOR(ROOT_DEV) == FLOPPY_MAJOR) swim3_fd_eject(MINOR(ROOT_DEV)); else if(MAJOR(real_root_dev) == FLOPPY_MAJOR) swim3_fd_eject(MINOR(real_root_dev)); #endif printk(KERN_NOTICE "VFS: Insert root floppy disk to be loaded into RAM disk and press ENTER\n"); wait_for_keypress(); } rd_load_image(ROOT_DEV,rd_image_start, n); } void __init rd_load(void) { rd_load_disk(0); } void __init rd_load_secondary(void) { rd_load_disk(1); } #ifdef CONFIG_BLK_DEV_INITRD void __init initrd_load(void) { rd_load_image(MKDEV(MAJOR_NR, INITRD_MINOR),rd_image_start,0); } #endif #endif /* RD_LOADER */ #ifdef BUILD_CRAMDISK /* * gzip declarations */ #define OF(args) args #ifndef memzero #define memzero(s, n) memset ((s), 0, (n)) #endif typedef unsigned char uch; typedef unsigned short ush; typedef unsigned long ulg; #define INBUFSIZ 4096 #define WSIZE 0x8000 /* window size--must be a power of two, and */ /* at least 32K for zip's deflate method */ static uch *inbuf; static uch *window; static unsigned insize; /* valid bytes in inbuf */ static unsigned inptr; /* index of next byte to be processed in inbuf */ static unsigned outcnt; /* bytes in output buffer */ static int exit_code; static long bytes_out; static struct file *crd_infp, *crd_outfp; #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) /* Diagnostic functions (stubbed out) */ #define Assert(cond,msg) #define Trace(x) #define Tracev(x) #define Tracevv(x) #define Tracec(c,x) #define Tracecv(c,x) #define STATIC static static int fill_inbuf(void); static void flush_window(void); static void *malloc(int size); static void free(void *where); static void error(char *m); static void gzip_mark(void **); static void gzip_release(void **); #include "../../lib/inflate.c" static void __init *malloc(int size) { return kmalloc(size, GFP_KERNEL); } static void __init free(void *where) { kfree(where); } static void __init gzip_mark(void **ptr) { } static void __init gzip_release(void **ptr) { } /* =========================================================================== * Fill the input buffer. This is called only when the buffer is empty * and at least one byte is really needed. */ static int __init fill_inbuf(void) { if (exit_code) return -1; insize = crd_infp->f_op->read(crd_infp, inbuf, INBUFSIZ, &crd_infp->f_pos); if (insize == 0) return -1; inptr = 1; return inbuf[0]; } /* =========================================================================== * Write the output window window[0..outcnt-1] and update crc and bytes_out. * (Used for the decompressed data only.) */ static void __init flush_window(void) { ulg c = crc; /* temporary variable */ unsigned n; uch *in, ch; crd_outfp->f_op->write(crd_outfp, window, outcnt, &crd_outfp->f_pos); in = window; for (n = 0; n < outcnt; n++) { ch = *in++; c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); } crc = c; bytes_out += (ulg)outcnt; outcnt = 0; } static void __init error(char *x) { printk(KERN_ERR "%s", x); exit_code = 1; } static int __init crd_load(struct file * fp, struct file *outfp) { int result; insize = 0; /* valid bytes in inbuf */ inptr = 0; /* index of next byte to be processed in inbuf */ outcnt = 0; /* bytes in output buffer */ exit_code = 0; bytes_out = 0; crc = (ulg)0xffffffffL; /* shift register contents */ crd_infp = fp; crd_outfp = outfp; inbuf = kmalloc(INBUFSIZ, GFP_KERNEL); if (inbuf == 0) { printk(KERN_ERR "RAMDISK: Couldn't allocate gzip buffer\n"); return -1; } window = kmalloc(WSIZE, GFP_KERNEL); if (window == 0) { printk(KERN_ERR "RAMDISK: Couldn't allocate gzip window\n"); kfree(inbuf); return -1; } makecrc(); result = gunzip(); kfree(inbuf); kfree(window); return result; } #endif /* BUILD_CRAMDISK */