rewrite rd

This is a rewrite of the ramdisk block device driver.

The old one is really difficult because it effectively implements a block
device which serves data out of its own buffer cache.  It relies on the dirty
bit being set, to pin its backing store in cache, however there are non
trivial paths which can clear the dirty bit (eg.  try_to_free_buffers()),
which had recently lead to data corruption.  And in general it is completely
wrong for a block device driver to do this.

The new one is more like a regular block device driver.  It has no idea about
vm/vfs stuff.  It's backing store is similar to the buffer cache (a simple
radix-tree of pages), but it doesn't know anything about page cache (the pages
in the radix tree are not pagecache pages).

There is one slight downside -- direct block device access and filesystem
metadata access goes through an extra copy and gets stored in RAM twice.
However, this downside is only slight, because the real buffercache of the
device is now reclaimable (because we're not playing crazy games with it), so
under memory intensive situations, footprint should effectively be the same --
maybe even a slight advantage to the new driver because it can also reclaim
buffer heads.

The fact that it now goes through all the regular vm/fs paths makes it
much more useful for testing, too.

   text    data     bss     dec     hex filename
   2837     849     384    4070     fe6 drivers/block/rd.o
   3528     371      12    3911     f47 drivers/block/brd.o

Text is larger, but data and bss are smaller, making total size smaller.

A few other nice things about it:
- Similar structure and layout to the new loop device handlinag.
- Dynamic ramdisk creation.
- Runtime flexible buffer head size (because it is no longer part of the
  ramdisk code).
- Boot / load time flexible ramdisk size, which could easily be extended
  to a per-ramdisk runtime changeable size (eg. with an ioctl).
- Can use highmem for the backing store.

[akpm@linux-foundation.org: fix build]
[byron.bbradley@gmail.com: make rd_size non-static]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Byron Bradley <byron.bbradley@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 537 deletions

diff --git a/drivers/block/rd.c b/drivers/block/rd.c
deleted file mode 100644
index 06e23be7090..00000000000
--- a/drivers/block/rd.c
+++ /dev/null
@@ -1,537 +0,0 @@
-/*
- * 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/string.h>
-#include <linux/slab.h>
-#include <asm/atomic.h>
-#include <linux/bio.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/init.h>
-#include <linux/pagemap.h>
-#include <linux/blkdev.h>
-#include <linux/genhd.h>
-#include <linux/buffer_head.h>		/* for invalidate_bdev() */
-#include <linux/backing-dev.h>
-#include <linux/blkpg.h>
-#include <linux/writeback.h>
-#include <linux/log2.h>
-
-#include <asm/uaccess.h>
-
-/* Various static variables go here.  Most are used only in the RAM disk code.
- */
-
-static struct gendisk *rd_disks[CONFIG_BLK_DEV_RAM_COUNT];
-static struct block_device *rd_bdev[CONFIG_BLK_DEV_RAM_COUNT];/* Protected device data */
-static struct request_queue *rd_queue[CONFIG_BLK_DEV_RAM_COUNT];
-
-/*
- * 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).
- */
-static int rd_blocksize = CONFIG_BLK_DEV_RAM_BLOCKSIZE;
-
-/*
- * Copyright (C) 2000 Linus Torvalds.
- *               2000 Transmeta Corp.
- * aops copied from ramfs.
- */
-
-/*
- * If a ramdisk page has buffers, some may be uptodate and some may be not.
- * To bring the page uptodate we zero out the non-uptodate buffers.  The
- * page must be locked.
- */
-static void make_page_uptodate(struct page *page)
-{
-	if (page_has_buffers(page)) {
-		struct buffer_head *bh = page_buffers(page);
-		struct buffer_head *head = bh;
-
-		do {
-			if (!buffer_uptodate(bh)) {
-				memset(bh->b_data, 0, bh->b_size);
-				/*
-				 * akpm: I'm totally undecided about this.  The
-				 * buffer has just been magically brought "up to
-				 * date", but nobody should want to be reading
-				 * it anyway, because it hasn't been used for
-				 * anything yet.  It is still in a "not read
-				 * from disk yet" state.
-				 *
-				 * But non-uptodate buffers against an uptodate
-				 * page are against the rules.  So do it anyway.
-				 */
-				 set_buffer_uptodate(bh);
-			}
-		} while ((bh = bh->b_this_page) != head);
-	} else {
-		memset(page_address(page), 0, PAGE_CACHE_SIZE);
-	}
-	flush_dcache_page(page);
-	SetPageUptodate(page);
-}
-
-static int ramdisk_readpage(struct file *file, struct page *page)
-{
-	if (!PageUptodate(page))
-		make_page_uptodate(page);
-	unlock_page(page);
-	return 0;
-}
-
-static int ramdisk_prepare_write(struct file *file, struct page *page,
-				unsigned offset, unsigned to)
-{
-	if (!PageUptodate(page))
-		make_page_uptodate(page);
-	return 0;
-}
-
-static int ramdisk_commit_write(struct file *file, struct page *page,
-				unsigned offset, unsigned to)
-{
-	set_page_dirty(page);
-	return 0;
-}
-
-/*
- * ->writepage to the blockdev's mapping has to redirty the page so that the
- * VM doesn't go and steal it.  We return AOP_WRITEPAGE_ACTIVATE so that the VM
- * won't try to (pointlessly) write the page again for a while.
- *
- * Really, these pages should not be on the LRU at all.
- */
-static int ramdisk_writepage(struct page *page, struct writeback_control *wbc)
-{
-	if (!PageUptodate(page))
-		make_page_uptodate(page);
-	SetPageDirty(page);
-	if (wbc->for_reclaim)
-		return AOP_WRITEPAGE_ACTIVATE;
-	unlock_page(page);
-	return 0;
-}
-
-/*
- * This is a little speedup thing: short-circuit attempts to write back the
- * ramdisk blockdev inode to its non-existent backing store.
- */
-static int ramdisk_writepages(struct address_space *mapping,
-				struct writeback_control *wbc)
-{
-	return 0;
-}
-
-/*
- * ramdisk blockdev pages have their own ->set_page_dirty() because we don't
- * want them to contribute to dirty memory accounting.
- */
-static int ramdisk_set_page_dirty(struct page *page)
-{
-	if (!TestSetPageDirty(page))
-		return 1;
-	return 0;
-}
-
-/*
- * releasepage is called by pagevec_strip/try_to_release_page if
- * buffers_heads_over_limit is true. Without a releasepage function
- * try_to_free_buffers is called instead. That can unset the dirty
- * bit of our ram disk pages, which will be eventually freed, even
- * if the page is still in use.
- */
-static int ramdisk_releasepage(struct page *page, gfp_t dummy)
-{
-	return 0;
-}
-
-static const struct address_space_operations ramdisk_aops = {
-	.readpage	= ramdisk_readpage,
-	.prepare_write	= ramdisk_prepare_write,
-	.commit_write	= ramdisk_commit_write,
-	.writepage	= ramdisk_writepage,
-	.set_page_dirty	= ramdisk_set_page_dirty,
-	.writepages	= ramdisk_writepages,
-	.releasepage	= ramdisk_releasepage,
-};
-
-static int rd_blkdev_pagecache_IO(int rw, struct bio_vec *vec, sector_t sector,
-				struct address_space *mapping)
-{
-	pgoff_t index = sector >> (PAGE_CACHE_SHIFT - 9);
-	unsigned int vec_offset = vec->bv_offset;
-	int offset = (sector << 9) & ~PAGE_CACHE_MASK;
-	int size = vec->bv_len;
-	int err = 0;
-
-	do {
-		int count;
-		struct page *page;
-		char *src;
-		char *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;
-		}
-
-		if (!PageUptodate(page))
-			make_page_uptodate(page);
-
-		index++;
-
-		if (rw == READ) {
-			src = kmap_atomic(page, KM_USER0) + offset;
-			dst = kmap_atomic(vec->bv_page, KM_USER1) + vec_offset;
-		} else {
-			src = kmap_atomic(vec->bv_page, KM_USER0) + vec_offset;
-			dst = kmap_atomic(page, KM_USER1) + offset;
-		}
-		offset = 0;
-		vec_offset += count;
-
-		memcpy(dst, src, count);
-
-		kunmap_atomic(src, KM_USER0);
-		kunmap_atomic(dst, KM_USER1);
-
-		if (rw == READ)
-			flush_dcache_page(vec->bv_page);
-		else
-			set_page_dirty(page);
-		unlock_page(page);
-		put_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(struct request_queue *q, struct bio *bio)
-{
-	struct block_device *bdev = bio->bi_bdev;
-	struct address_space * mapping = bdev->bd_inode->i_mapping;
-	sector_t sector = bio->bi_sector;
-	unsigned long len = bio->bi_size >> 9;
-	int rw = bio_data_dir(bio);
-	struct bio_vec *bvec;
-	int ret = 0, i;
-
-	if (sector + len > get_capacity(bdev->bd_disk))
-		goto fail;
-
-	if (rw==READA)
-		rw=READ;
-
-	bio_for_each_segment(bvec, bio, i) {
-		ret |= rd_blkdev_pagecache_IO(rw, bvec, sector, mapping);
-		sector += bvec->bv_len >> 9;
-	}
-	if (ret)
-		goto fail;
-
-	bio_endio(bio, 0);
-	return 0;
-fail:
-	bio_io_error(bio);
-	return 0;
-} 
-
-static int rd_ioctl(struct inode *inode, struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	int error;
-	struct block_device *bdev = inode->i_bdev;
-
-	if (cmd != BLKFLSBUF)
-		return -ENOTTY;
-
-	/*
-	 * 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;
-	mutex_lock(&bdev->bd_mutex);
-	if (bdev->bd_openers <= 2) {
-		truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
-		error = 0;
-	}
-	mutex_unlock(&bdev->bd_mutex);
-	return error;
-}
-
-/*
- * This is the backing_dev_info for the blockdev inode itself.  It doesn't need
- * writeback and it does not contribute to dirty memory accounting.
- */
-static struct backing_dev_info rd_backing_dev_info = {
-	.ra_pages	= 0,	/* No readahead */
-	.capabilities	= BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK | BDI_CAP_MAP_COPY,
-	.unplug_io_fn	= default_unplug_io_fn,
-};
-
-/*
- * This is the backing_dev_info for the files which live atop the ramdisk
- * "device".  These files do need writeback and they do contribute to dirty
- * memory accounting.
- */
-static struct backing_dev_info rd_file_backing_dev_info = {
-	.ra_pages	= 0,	/* No readahead */
-	.capabilities	= BDI_CAP_MAP_COPY,	/* Does contribute to dirty memory */
-	.unplug_io_fn	= default_unplug_io_fn,
-};
-
-static int rd_open(struct inode *inode, struct file *filp)
-{
-	unsigned unit = iminor(inode);
-
-	if (rd_bdev[unit] == NULL) {
-		struct block_device *bdev = inode->i_bdev;
-		struct address_space *mapping;
-		unsigned bsize;
-		gfp_t gfp_mask;
-
-		inode = igrab(bdev->bd_inode);
-		rd_bdev[unit] = bdev;
-		bdev->bd_openers++;
-		bsize = bdev_hardsect_size(bdev);
-		bdev->bd_block_size = bsize;
-		inode->i_blkbits = blksize_bits(bsize);
-		inode->i_size = get_capacity(bdev->bd_disk)<<9;
-
-		mapping = inode->i_mapping;
-		mapping->a_ops = &ramdisk_aops;
-		mapping->backing_dev_info = &rd_backing_dev_info;
-		bdev->bd_inode_backing_dev_info = &rd_file_backing_dev_info;
-
-		/*
-		 * Deep badness.  rd_blkdev_pagecache_IO() needs to allocate
-		 * pagecache pages within a request_fn.  We cannot recur back
-		 * into the filesystem which is mounted atop the ramdisk, because
-		 * that would deadlock on fs locks.  And we really don't want
-		 * to reenter rd_blkdev_pagecache_IO when we're already within
-		 * that function.
-		 *
-		 * So we turn off __GFP_FS and __GFP_IO.
-		 *
-		 * And to give this thing a hope of working, turn on __GFP_HIGH.
-		 * Hopefully, there's enough regular memory allocation going on
-		 * for the page allocator emergency pools to keep the ramdisk
-		 * driver happy.
-		 */
-		gfp_mask = mapping_gfp_mask(mapping);
-		gfp_mask &= ~(__GFP_FS|__GFP_IO);
-		gfp_mask |= __GFP_HIGH;
-		mapping_set_gfp_mask(mapping, gfp_mask);
-	}
-
-	return 0;
-}
-
-static struct block_device_operations rd_bd_op = {
-	.owner =	THIS_MODULE,
-	.open =		rd_open,
-	.ioctl =	rd_ioctl,
-};
-
-/*
- * Before freeing the module, invalidate all of the protected buffers!
- */
-static void __exit rd_cleanup(void)
-{
-	int i;
-
-	for (i = 0; i < CONFIG_BLK_DEV_RAM_COUNT; i++) {
-		struct block_device *bdev = rd_bdev[i];
-		rd_bdev[i] = NULL;
-		if (bdev) {
-			invalidate_bdev(bdev);
-			blkdev_put(bdev);
-		}
-		del_gendisk(rd_disks[i]);
-		put_disk(rd_disks[i]);
-		blk_cleanup_queue(rd_queue[i]);
-	}
-	unregister_blkdev(RAMDISK_MAJOR, "ramdisk");
-
-	bdi_destroy(&rd_file_backing_dev_info);
-	bdi_destroy(&rd_backing_dev_info);
-}
-
-/*
- * This is the registration and initialization section of the RAM disk driver
- */
-static int __init rd_init(void)
-{
-	int i;
-	int err;
-
-	err = bdi_init(&rd_backing_dev_info);
-	if (err)
-		goto out2;
-
-	err = bdi_init(&rd_file_backing_dev_info);
-	if (err) {
-		bdi_destroy(&rd_backing_dev_info);
-		goto out2;
-	}
-
-	err = -ENOMEM;
-
-	if (rd_blocksize > PAGE_SIZE || rd_blocksize < 512 ||
-			!is_power_of_2(rd_blocksize)) {
-		printk("RAMDISK: wrong blocksize %d, reverting to defaults\n",
-		       rd_blocksize);
-		rd_blocksize = BLOCK_SIZE;
-	}
-
-	for (i = 0; i < CONFIG_BLK_DEV_RAM_COUNT; i++) {
-		rd_disks[i] = alloc_disk(1);
-		if (!rd_disks[i])
-			goto out;
-
-		rd_queue[i] = blk_alloc_queue(GFP_KERNEL);
-		if (!rd_queue[i]) {
-			put_disk(rd_disks[i]);
-			goto out;
-		}
-	}
-
-	if (register_blkdev(RAMDISK_MAJOR, "ramdisk")) {
-		err = -EIO;
-		goto out;
-	}
-
-	for (i = 0; i < CONFIG_BLK_DEV_RAM_COUNT; i++) {
-		struct gendisk *disk = rd_disks[i];
-
-		blk_queue_make_request(rd_queue[i], &rd_make_request);
-		blk_queue_hardsect_size(rd_queue[i], rd_blocksize);
-
-		/* rd_size is given in kB */
-		disk->major = RAMDISK_MAJOR;
-		disk->first_minor = i;
-		disk->fops = &rd_bd_op;
-		disk->queue = rd_queue[i];
-		disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO;
-		sprintf(disk->disk_name, "ram%d", i);
-		set_capacity(disk, rd_size * 2);
-		add_disk(rd_disks[i]);
-	}
-
-	/* rd_size is given in kB */
-	printk("RAMDISK driver initialized: "
-		"%d RAM disks of %dK size %d blocksize\n",
-		CONFIG_BLK_DEV_RAM_COUNT, rd_size, rd_blocksize);
-
-	return 0;
-out:
-	while (i--) {
-		put_disk(rd_disks[i]);
-		blk_cleanup_queue(rd_queue[i]);
-	}
-	bdi_destroy(&rd_backing_dev_info);
-	bdi_destroy(&rd_file_backing_dev_info);
-out2:
-	return err;
-}
-
-module_init(rd_init);
-module_exit(rd_cleanup);
-
-/* options - nonmodular */
-#ifndef MODULE
-static int __init ramdisk_size(char *str)
-{
-	rd_size = simple_strtol(str,NULL,0);
-	return 1;
-}
-static int __init ramdisk_blocksize(char *str)
-{
-	rd_blocksize = simple_strtol(str,NULL,0);
-	return 1;
-}
-__setup("ramdisk_size=", ramdisk_size);
-__setup("ramdisk_blocksize=", ramdisk_blocksize);
-#endif
-
-/* options - modular */
-module_param(rd_size, int, 0);
-MODULE_PARM_DESC(rd_size, "Size of each RAM disk in kbytes.");
-module_param(rd_blocksize, int, 0);
-MODULE_PARM_DESC(rd_blocksize, "Blocksize of each RAM disk in bytes.");
-MODULE_ALIAS_BLOCKDEV_MAJOR(RAMDISK_MAJOR);
-
-MODULE_LICENSE("GPL");