Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 494 deletions

diff --git a/ANDROID_3.4.5/fs/sysv/itree.c b/ANDROID_3.4.5/fs/sysv/itree.c
deleted file mode 100644
index 90b54b43..00000000
--- a/ANDROID_3.4.5/fs/sysv/itree.c
+++ /dev/null
@@ -1,494 +0,0 @@
-/*
- *  linux/fs/sysv/itree.c
- *
- *  Handling of indirect blocks' trees.
- *  AV, Sep--Dec 2000
- */
-
-#include <linux/buffer_head.h>
-#include <linux/mount.h>
-#include <linux/string.h>
-#include "sysv.h"
-
-enum {DIRECT = 10, DEPTH = 4};	/* Have triple indirect */
-
-static inline void dirty_indirect(struct buffer_head *bh, struct inode *inode)
-{
-	mark_buffer_dirty_inode(bh, inode);
-	if (IS_SYNC(inode))
-		sync_dirty_buffer(bh);
-}
-
-static int block_to_path(struct inode *inode, long block, int offsets[DEPTH])
-{
-	struct super_block *sb = inode->i_sb;
-	struct sysv_sb_info *sbi = SYSV_SB(sb);
-	int ptrs_bits = sbi->s_ind_per_block_bits;
-	unsigned long	indirect_blocks = sbi->s_ind_per_block,
-			double_blocks = sbi->s_ind_per_block_2;
-	int n = 0;
-
-	if (block < 0) {
-		printk("sysv_block_map: block < 0\n");
-	} else if (block < DIRECT) {
-		offsets[n++] = block;
-	} else if ( (block -= DIRECT) < indirect_blocks) {
-		offsets[n++] = DIRECT;
-		offsets[n++] = block;
-	} else if ((block -= indirect_blocks) < double_blocks) {
-		offsets[n++] = DIRECT+1;
-		offsets[n++] = block >> ptrs_bits;
-		offsets[n++] = block & (indirect_blocks - 1);
-	} else if (((block -= double_blocks) >> (ptrs_bits * 2)) < indirect_blocks) {
-		offsets[n++] = DIRECT+2;
-		offsets[n++] = block >> (ptrs_bits * 2);
-		offsets[n++] = (block >> ptrs_bits) & (indirect_blocks - 1);
-		offsets[n++] = block & (indirect_blocks - 1);
-	} else {
-		/* nothing */;
-	}
-	return n;
-}
-
-static inline int block_to_cpu(struct sysv_sb_info *sbi, sysv_zone_t nr)
-{
-	return sbi->s_block_base + fs32_to_cpu(sbi, nr);
-}
-
-typedef struct {
-	sysv_zone_t     *p;
-	sysv_zone_t     key;
-	struct buffer_head *bh;
-} Indirect;
-
-static DEFINE_RWLOCK(pointers_lock);
-
-static inline void add_chain(Indirect *p, struct buffer_head *bh, sysv_zone_t *v)
-{
-	p->key = *(p->p = v);
-	p->bh = bh;
-}
-
-static inline int verify_chain(Indirect *from, Indirect *to)
-{
-	while (from <= to && from->key == *from->p)
-		from++;
-	return (from > to);
-}
-
-static inline sysv_zone_t *block_end(struct buffer_head *bh)
-{
-	return (sysv_zone_t*)((char*)bh->b_data + bh->b_size);
-}
-
-/*
- * Requires read_lock(&pointers_lock) or write_lock(&pointers_lock)
- */
-static Indirect *get_branch(struct inode *inode,
-			    int depth,
-			    int offsets[],
-			    Indirect chain[],
-			    int *err)
-{
-	struct super_block *sb = inode->i_sb;
-	Indirect *p = chain;
-	struct buffer_head *bh;
-
-	*err = 0;
-	add_chain(chain, NULL, SYSV_I(inode)->i_data + *offsets);
-	if (!p->key)
-		goto no_block;
-	while (--depth) {
-		int block = block_to_cpu(SYSV_SB(sb), p->key);
-		bh = sb_bread(sb, block);
-		if (!bh)
-			goto failure;
-		if (!verify_chain(chain, p))
-			goto changed;
-		add_chain(++p, bh, (sysv_zone_t*)bh->b_data + *++offsets);
-		if (!p->key)
-			goto no_block;
-	}
-	return NULL;
-
-changed:
-	brelse(bh);
-	*err = -EAGAIN;
-	goto no_block;
-failure:
-	*err = -EIO;
-no_block:
-	return p;
-}
-
-static int alloc_branch(struct inode *inode,
-			int num,
-			int *offsets,
-			Indirect *branch)
-{
-	int blocksize = inode->i_sb->s_blocksize;
-	int n = 0;
-	int i;
-
-	branch[0].key = sysv_new_block(inode->i_sb);
-	if (branch[0].key) for (n = 1; n < num; n++) {
-		struct buffer_head *bh;
-		int parent;
-		/* Allocate the next block */
-		branch[n].key = sysv_new_block(inode->i_sb);
-		if (!branch[n].key)
-			break;
-		/*
-		 * Get buffer_head for parent block, zero it out and set 
-		 * the pointer to new one, then send parent to disk.
-		 */
-		parent = block_to_cpu(SYSV_SB(inode->i_sb), branch[n-1].key);
-		bh = sb_getblk(inode->i_sb, parent);
-		lock_buffer(bh);
-		memset(bh->b_data, 0, blocksize);
-		branch[n].bh = bh;
-		branch[n].p = (sysv_zone_t*) bh->b_data + offsets[n];
-		*branch[n].p = branch[n].key;
-		set_buffer_uptodate(bh);
-		unlock_buffer(bh);
-		dirty_indirect(bh, inode);
-	}
-	if (n == num)
-		return 0;
-
-	/* Allocation failed, free what we already allocated */
-	for (i = 1; i < n; i++)
-		bforget(branch[i].bh);
-	for (i = 0; i < n; i++)
-		sysv_free_block(inode->i_sb, branch[i].key);
-	return -ENOSPC;
-}
-
-static inline int splice_branch(struct inode *inode,
-				Indirect chain[],
-				Indirect *where,
-				int num)
-{
-	int i;
-
-	/* Verify that place we are splicing to is still there and vacant */
-	write_lock(&pointers_lock);
-	if (!verify_chain(chain, where-1) || *where->p)
-		goto changed;
-	*where->p = where->key;
-	write_unlock(&pointers_lock);
-
-	inode->i_ctime = CURRENT_TIME_SEC;
-
-	/* had we spliced it onto indirect block? */
-	if (where->bh)
-		dirty_indirect(where->bh, inode);
-
-	if (IS_SYNC(inode))
-		sysv_sync_inode(inode);
-	else
-		mark_inode_dirty(inode);
-	return 0;
-
-changed:
-	write_unlock(&pointers_lock);
-	for (i = 1; i < num; i++)
-		bforget(where[i].bh);
-	for (i = 0; i < num; i++)
-		sysv_free_block(inode->i_sb, where[i].key);
-	return -EAGAIN;
-}
-
-static int get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
-{
-	int err = -EIO;
-	int offsets[DEPTH];
-	Indirect chain[DEPTH];
-	struct super_block *sb = inode->i_sb;
-	Indirect *partial;
-	int left;
-	int depth = block_to_path(inode, iblock, offsets);
-
-	if (depth == 0)
-		goto out;
-
-reread:
-	read_lock(&pointers_lock);
-	partial = get_branch(inode, depth, offsets, chain, &err);
-	read_unlock(&pointers_lock);
-
-	/* Simplest case - block found, no allocation needed */
-	if (!partial) {
-got_it:
-		map_bh(bh_result, sb, block_to_cpu(SYSV_SB(sb),
-					chain[depth-1].key));
-		/* Clean up and exit */
-		partial = chain+depth-1; /* the whole chain */
-		goto cleanup;
-	}
-
-	/* Next simple case - plain lookup or failed read of indirect block */
-	if (!create || err == -EIO) {
-cleanup:
-		while (partial > chain) {
-			brelse(partial->bh);
-			partial--;
-		}
-out:
-		return err;
-	}
-
-	/*
-	 * Indirect block might be removed by truncate while we were
-	 * reading it. Handling of that case (forget what we've got and
-	 * reread) is taken out of the main path.
-	 */
-	if (err == -EAGAIN)
-		goto changed;
-
-	left = (chain + depth) - partial;
-	err = alloc_branch(inode, left, offsets+(partial-chain), partial);
-	if (err)
-		goto cleanup;
-
-	if (splice_branch(inode, chain, partial, left) < 0)
-		goto changed;
-
-	set_buffer_new(bh_result);
-	goto got_it;
-
-changed:
-	while (partial > chain) {
-		brelse(partial->bh);
-		partial--;
-	}
-	goto reread;
-}
-
-static inline int all_zeroes(sysv_zone_t *p, sysv_zone_t *q)
-{
-	while (p < q)
-		if (*p++)
-			return 0;
-	return 1;
-}
-
-static Indirect *find_shared(struct inode *inode,
-				int depth,
-				int offsets[],
-				Indirect chain[],
-				sysv_zone_t *top)
-{
-	Indirect *partial, *p;
-	int k, err;
-
-	*top = 0;
-	for (k = depth; k > 1 && !offsets[k-1]; k--)
-		;
-
-	write_lock(&pointers_lock);
-	partial = get_branch(inode, k, offsets, chain, &err);
-	if (!partial)
-		partial = chain + k-1;
-	/*
-	 * If the branch acquired continuation since we've looked at it -
-	 * fine, it should all survive and (new) top doesn't belong to us.
-	 */
-	if (!partial->key && *partial->p) {
-		write_unlock(&pointers_lock);
-		goto no_top;
-	}
-	for (p=partial; p>chain && all_zeroes((sysv_zone_t*)p->bh->b_data,p->p); p--)
-		;
-	/*
-	 * OK, we've found the last block that must survive. The rest of our
-	 * branch should be detached before unlocking. However, if that rest
-	 * of branch is all ours and does not grow immediately from the inode
-	 * it's easier to cheat and just decrement partial->p.
-	 */
-	if (p == chain + k - 1 && p > chain) {
-		p->p--;
-	} else {
-		*top = *p->p;
-		*p->p = 0;
-	}
-	write_unlock(&pointers_lock);
-
-	while (partial > p) {
-		brelse(partial->bh);
-		partial--;
-	}
-no_top:
-	return partial;
-}
-
-static inline void free_data(struct inode *inode, sysv_zone_t *p, sysv_zone_t *q)
-{
-	for ( ; p < q ; p++) {
-		sysv_zone_t nr = *p;
-		if (nr) {
-			*p = 0;
-			sysv_free_block(inode->i_sb, nr);
-			mark_inode_dirty(inode);
-		}
-	}
-}
-
-static void free_branches(struct inode *inode, sysv_zone_t *p, sysv_zone_t *q, int depth)
-{
-	struct buffer_head * bh;
-	struct super_block *sb = inode->i_sb;
-
-	if (depth--) {
-		for ( ; p < q ; p++) {
-			int block;
-			sysv_zone_t nr = *p;
-			if (!nr)
-				continue;
-			*p = 0;
-			block = block_to_cpu(SYSV_SB(sb), nr);
-			bh = sb_bread(sb, block);
-			if (!bh)
-				continue;
-			free_branches(inode, (sysv_zone_t*)bh->b_data,
-					block_end(bh), depth);
-			bforget(bh);
-			sysv_free_block(sb, nr);
-			mark_inode_dirty(inode);
-		}
-	} else
-		free_data(inode, p, q);
-}
-
-void sysv_truncate (struct inode * inode)
-{
-	sysv_zone_t *i_data = SYSV_I(inode)->i_data;
-	int offsets[DEPTH];
-	Indirect chain[DEPTH];
-	Indirect *partial;
-	sysv_zone_t nr = 0;
-	int n;
-	long iblock;
-	unsigned blocksize;
-
-	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
-	    S_ISLNK(inode->i_mode)))
-		return;
-
-	blocksize = inode->i_sb->s_blocksize;
-	iblock = (inode->i_size + blocksize-1)
-					>> inode->i_sb->s_blocksize_bits;
-
-	block_truncate_page(inode->i_mapping, inode->i_size, get_block);
-
-	n = block_to_path(inode, iblock, offsets);
-	if (n == 0)
-		return;
-
-	if (n == 1) {
-		free_data(inode, i_data+offsets[0], i_data + DIRECT);
-		goto do_indirects;
-	}
-
-	partial = find_shared(inode, n, offsets, chain, &nr);
-	/* Kill the top of shared branch (already detached) */
-	if (nr) {
-		if (partial == chain)
-			mark_inode_dirty(inode);
-		else
-			dirty_indirect(partial->bh, inode);
-		free_branches(inode, &nr, &nr+1, (chain+n-1) - partial);
-	}
-	/* Clear the ends of indirect blocks on the shared branch */
-	while (partial > chain) {
-		free_branches(inode, partial->p + 1, block_end(partial->bh),
-				(chain+n-1) - partial);
-		dirty_indirect(partial->bh, inode);
-		brelse (partial->bh);
-		partial--;
-	}
-do_indirects:
-	/* Kill the remaining (whole) subtrees (== subtrees deeper than...) */
-	while (n < DEPTH) {
-		nr = i_data[DIRECT + n - 1];
-		if (nr) {
-			i_data[DIRECT + n - 1] = 0;
-			mark_inode_dirty(inode);
-			free_branches(inode, &nr, &nr+1, n);
-		}
-		n++;
-	}
-	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
-	if (IS_SYNC(inode))
-		sysv_sync_inode (inode);
-	else
-		mark_inode_dirty(inode);
-}
-
-static unsigned sysv_nblocks(struct super_block *s, loff_t size)
-{
-	struct sysv_sb_info *sbi = SYSV_SB(s);
-	int ptrs_bits = sbi->s_ind_per_block_bits;
-	unsigned blocks, res, direct = DIRECT, i = DEPTH;
-	blocks = (size + s->s_blocksize - 1) >> s->s_blocksize_bits;
-	res = blocks;
-	while (--i && blocks > direct) {
-		blocks = ((blocks - direct - 1) >> ptrs_bits) + 1;
-		res += blocks;
-		direct = 1;
-	}
-	return blocks;
-}
-
-int sysv_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
-{
-	struct super_block *s = dentry->d_sb;
-	generic_fillattr(dentry->d_inode, stat);
-	stat->blocks = (s->s_blocksize / 512) * sysv_nblocks(s, stat->size);
-	stat->blksize = s->s_blocksize;
-	return 0;
-}
-
-static int sysv_writepage(struct page *page, struct writeback_control *wbc)
-{
-	return block_write_full_page(page,get_block,wbc);
-}
-
-static int sysv_readpage(struct file *file, struct page *page)
-{
-	return block_read_full_page(page,get_block);
-}
-
-int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len)
-{
-	return __block_write_begin(page, pos, len, get_block);
-}
-
-static int sysv_write_begin(struct file *file, struct address_space *mapping,
-			loff_t pos, unsigned len, unsigned flags,
-			struct page **pagep, void **fsdata)
-{
-	int ret;
-
-	ret = block_write_begin(mapping, pos, len, flags, pagep, get_block);
-	if (unlikely(ret)) {
-		loff_t isize = mapping->host->i_size;
-		if (pos + len > isize)
-			vmtruncate(mapping->host, isize);
-	}
-
-	return ret;
-}
-
-static sector_t sysv_bmap(struct address_space *mapping, sector_t block)
-{
-	return generic_block_bmap(mapping,block,get_block);
-}
-
-const struct address_space_operations sysv_aops = {
-	.readpage = sysv_readpage,
-	.writepage = sysv_writepage,
-	.write_begin = sysv_write_begin,
-	.write_end = generic_write_end,
-	.bmap = sysv_bmap
-};