diff options
Diffstat (limited to 'old/xenolinux-2.4.16-sparse/drivers/block/rd.c')
| -rw-r--r-- | old/xenolinux-2.4.16-sparse/drivers/block/rd.c | 1009 |
1 files changed, 1009 insertions, 0 deletions
diff --git a/old/xenolinux-2.4.16-sparse/drivers/block/rd.c b/old/xenolinux-2.4.16-sparse/drivers/block/rd.c new file mode 100644 index 0000000000..ffcc9d3825 --- /dev/null +++ b/old/xenolinux-2.4.16-sparse/drivers/block/rd.c @@ -0,0 +1,1009 @@ +/* + * 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 <werner@suse.de>, Apr '99 + */ + +#include <linux/config.h> +#include <linux/sched.h> +#include <linux/minix_fs.h> +#include <linux/ext2_fs.h> +#include <linux/romfs_fs.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/hdreg.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/slab.h> +#include <linux/ioctl.h> +#include <linux/fd.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/devfs_fs_kernel.h> +#include <linux/smp_lock.h> + +#include <asm/system.h> +#include <asm/uaccess.h> +#include <asm/byteorder.h> + +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 <linux/blk.h> +#include <linux/blkpg.h> + +/* 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 desiderable 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 int ramdisk_readpage(struct file *file, struct page * page) +{ + if (!Page_Uptodate(page)) { + memset(kmap(page), 0, PAGE_CACHE_SIZE); + kunmap(page); + flush_dcache_page(page); + SetPageUptodate(page); + } + UnlockPage(page); + return 0; +} + +static int ramdisk_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) +{ + if (!Page_Uptodate(page)) { + void *addr = page_address(page); + memset(addr, 0, PAGE_CACHE_SIZE); + flush_dcache_page(page); + SetPageUptodate(page); + } + 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 = -EIO; + err = 0; + mapping = rd_bdev[minor]->bd_inode->i_mapping; + + 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 ** hash; + struct page * page; + char * src, * dst; + int unlock = 0; + + count = PAGE_CACHE_SIZE - offset; + if (count > size) + count = size; + size -= count; + + hash = page_hash(mapping, index); + page = __find_get_page(mapping, index, hash); + if (!page) { + page = grab_cache_page(mapping, index); + err = -ENOMEM; + if (!page) + goto out; + err = 0; + + if (!Page_Uptodate(page)) { + memset(kmap(page), 0, PAGE_CACHE_SIZE); + kunmap(page); + SetPageUptodate(page); + } + + unlock = 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); + } + if (unlock) + 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 <rgooch@atnf.csiro.au> 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: + sbh->b_end_io(sbh,0); + 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); + 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) && !defined(CONFIG_XENO) + 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) && !defined(CONFIG_XENO) + 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 */ + |