1 files changed, 0 insertions, 274 deletions
diff --git a/fs/logfs/dev_mtd.c b/fs/logfs/dev_mtd.c
deleted file mode 100644
index b76a62b1978f..000000000000
--- a/fs/logfs/dev_mtd.c
+++ /dev/null
@@ -1,274 +0,0 @@
-/*
- * fs/logfs/dev_mtd.c	- Device access methods for MTD
- *
- * As should be obvious for Linux kernel code, license is GPLv2
- *
- * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org>
- */
-#include "logfs.h"
-#include <linux/completion.h>
-#include <linux/mount.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-
-#define PAGE_OFS(ofs) ((ofs) & (PAGE_SIZE-1))
-
-static int logfs_mtd_read(struct super_block *sb, loff_t ofs, size_t len,
-			void *buf)
-{
-	struct mtd_info *mtd = logfs_super(sb)->s_mtd;
-	size_t retlen;
-	int ret;
-
-	ret = mtd_read(mtd, ofs, len, &retlen, buf);
-	BUG_ON(ret == -EINVAL);
-	if (ret)
-		return ret;
-
-	/* Not sure if we should loop instead. */
-	if (retlen != len)
-		return -EIO;
-
-	return 0;
-}
-
-static int loffs_mtd_write(struct super_block *sb, loff_t ofs, size_t len,
-			void *buf)
-{
-	struct logfs_super *super = logfs_super(sb);
-	struct mtd_info *mtd = super->s_mtd;
-	size_t retlen;
-	loff_t page_start, page_end;
-	int ret;
-
-	if (super->s_flags & LOGFS_SB_FLAG_RO)
-		return -EROFS;
-
-	BUG_ON((ofs >= mtd->size) || (len > mtd->size - ofs));
-	BUG_ON(ofs != (ofs >> super->s_writeshift) << super->s_writeshift);
-	BUG_ON(len > PAGE_SIZE);
-	page_start = ofs & PAGE_MASK;
-	page_end = PAGE_ALIGN(ofs + len) - 1;
-	ret = mtd_write(mtd, ofs, len, &retlen, buf);
-	if (ret || (retlen != len))
-		return -EIO;
-
-	return 0;
-}
-
-/*
- * For as long as I can remember (since about 2001) mtd->erase has been an
- * asynchronous interface lacking the first driver to actually use the
- * asynchronous properties.  So just to prevent the first implementor of such
- * a thing from breaking logfs in 2350, we do the usual pointless dance to
- * declare a completion variable and wait for completion before returning
- * from logfs_mtd_erase().  What an exercise in futility!
- */
-static void logfs_erase_callback(struct erase_info *ei)
-{
-	complete((struct completion *)ei->priv);
-}
-
-static int logfs_mtd_erase_mapping(struct super_block *sb, loff_t ofs,
-				size_t len)
-{
-	struct logfs_super *super = logfs_super(sb);
-	struct address_space *mapping = super->s_mapping_inode->i_mapping;
-	struct page *page;
-	pgoff_t index = ofs >> PAGE_SHIFT;
-
-	for (index = ofs >> PAGE_SHIFT; index < (ofs + len) >> PAGE_SHIFT; index++) {
-		page = find_get_page(mapping, index);
-		if (!page)
-			continue;
-		memset(page_address(page), 0xFF, PAGE_SIZE);
-		put_page(page);
-	}
-	return 0;
-}
-
-static int logfs_mtd_erase(struct super_block *sb, loff_t ofs, size_t len,
-		int ensure_write)
-{
-	struct mtd_info *mtd = logfs_super(sb)->s_mtd;
-	struct erase_info ei;
-	DECLARE_COMPLETION_ONSTACK(complete);
-	int ret;
-
-	BUG_ON(len % mtd->erasesize);
-	if (logfs_super(sb)->s_flags & LOGFS_SB_FLAG_RO)
-		return -EROFS;
-
-	memset(&ei, 0, sizeof(ei));
-	ei.mtd = mtd;
-	ei.addr = ofs;
-	ei.len = len;
-	ei.callback = logfs_erase_callback;
-	ei.priv = (long)&complete;
-	ret = mtd_erase(mtd, &ei);
-	if (ret)
-		return -EIO;
-
-	wait_for_completion(&complete);
-	if (ei.state != MTD_ERASE_DONE)
-		return -EIO;
-	return logfs_mtd_erase_mapping(sb, ofs, len);
-}
-
-static void logfs_mtd_sync(struct super_block *sb)
-{
-	struct mtd_info *mtd = logfs_super(sb)->s_mtd;
-
-	mtd_sync(mtd);
-}
-
-static int logfs_mtd_readpage(void *_sb, struct page *page)
-{
-	struct super_block *sb = _sb;
-	int err;
-
-	err = logfs_mtd_read(sb, page->index << PAGE_SHIFT, PAGE_SIZE,
-			page_address(page));
-	if (err == -EUCLEAN || err == -EBADMSG) {
-		/* -EBADMSG happens regularly on power failures */
-		err = 0;
-		/* FIXME: force GC this segment */
-	}
-	if (err) {
-		ClearPageUptodate(page);
-		SetPageError(page);
-	} else {
-		SetPageUptodate(page);
-		ClearPageError(page);
-	}
-	unlock_page(page);
-	return err;
-}
-
-static struct page *logfs_mtd_find_first_sb(struct super_block *sb, u64 *ofs)
-{
-	struct logfs_super *super = logfs_super(sb);
-	struct address_space *mapping = super->s_mapping_inode->i_mapping;
-	filler_t *filler = logfs_mtd_readpage;
-	struct mtd_info *mtd = super->s_mtd;
-
-	*ofs = 0;
-	while (mtd_block_isbad(mtd, *ofs)) {
-		*ofs += mtd->erasesize;
-		if (*ofs >= mtd->size)
-			return NULL;
-	}
-	BUG_ON(*ofs & ~PAGE_MASK);
-	return read_cache_page(mapping, *ofs >> PAGE_SHIFT, filler, sb);
-}
-
-static struct page *logfs_mtd_find_last_sb(struct super_block *sb, u64 *ofs)
-{
-	struct logfs_super *super = logfs_super(sb);
-	struct address_space *mapping = super->s_mapping_inode->i_mapping;
-	filler_t *filler = logfs_mtd_readpage;
-	struct mtd_info *mtd = super->s_mtd;
-
-	*ofs = mtd->size - mtd->erasesize;
-	while (mtd_block_isbad(mtd, *ofs)) {
-		*ofs -= mtd->erasesize;
-		if (*ofs <= 0)
-			return NULL;
-	}
-	*ofs = *ofs + mtd->erasesize - 0x1000;
-	BUG_ON(*ofs & ~PAGE_MASK);
-	return read_cache_page(mapping, *ofs >> PAGE_SHIFT, filler, sb);
-}
-
-static int __logfs_mtd_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
-		size_t nr_pages)
-{
-	struct logfs_super *super = logfs_super(sb);
-	struct address_space *mapping = super->s_mapping_inode->i_mapping;
-	struct page *page;
-	int i, err;
-
-	for (i = 0; i < nr_pages; i++) {
-		page = find_lock_page(mapping, index + i);
-		BUG_ON(!page);
-
-		err = loffs_mtd_write(sb, page->index << PAGE_SHIFT, PAGE_SIZE,
-					page_address(page));
-		unlock_page(page);
-		put_page(page);
-		if (err)
-			return err;
-	}
-	return 0;
-}
-
-static void logfs_mtd_writeseg(struct super_block *sb, u64 ofs, size_t len)
-{
-	struct logfs_super *super = logfs_super(sb);
-	int head;
-
-	if (super->s_flags & LOGFS_SB_FLAG_RO)
-		return;
-
-	if (len == 0) {
-		/* This can happen when the object fit perfectly into a
-		 * segment, the segment gets written per sync and subsequently
-		 * closed.
-		 */
-		return;
-	}
-	head = ofs & (PAGE_SIZE - 1);
-	if (head) {
-		ofs -= head;
-		len += head;
-	}
-	len = PAGE_ALIGN(len);
-	__logfs_mtd_writeseg(sb, ofs, ofs >> PAGE_SHIFT, len >> PAGE_SHIFT);
-}
-
-static void logfs_mtd_put_device(struct logfs_super *s)
-{
-	put_mtd_device(s->s_mtd);
-}
-
-static int logfs_mtd_can_write_buf(struct super_block *sb, u64 ofs)
-{
-	struct logfs_super *super = logfs_super(sb);
-	void *buf;
-	int err;
-
-	buf = kmalloc(super->s_writesize, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-	err = logfs_mtd_read(sb, ofs, super->s_writesize, buf);
-	if (err)
-		goto out;
-	if (memchr_inv(buf, 0xff, super->s_writesize))
-		err = -EIO;
-	kfree(buf);
-out:
-	return err;
-}
-
-static const struct logfs_device_ops mtd_devops = {
-	.find_first_sb	= logfs_mtd_find_first_sb,
-	.find_last_sb	= logfs_mtd_find_last_sb,
-	.readpage	= logfs_mtd_readpage,
-	.writeseg	= logfs_mtd_writeseg,
-	.erase		= logfs_mtd_erase,
-	.can_write_buf	= logfs_mtd_can_write_buf,
-	.sync		= logfs_mtd_sync,
-	.put_device	= logfs_mtd_put_device,
-};
-
-int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr)
-{
-	struct mtd_info *mtd = get_mtd_device(NULL, mtdnr);
-	if (IS_ERR(mtd))
-		return PTR_ERR(mtd);
-
-	s->s_bdev = NULL;
-	s->s_mtd = mtd;
-	s->s_devops = &mtd_devops;
-	return 0;
-}