1 files changed, 0 insertions, 382 deletions
diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
deleted file mode 100644
index 2e126d72d619..000000000000
--- a/fs/sysv/dir.c
+++ /dev/null
@@ -1,382 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  linux/fs/sysv/dir.c
- *
- *  minix/dir.c
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  coh/dir.c
- *  Copyright (C) 1993  Pascal Haible, Bruno Haible
- *
- *  sysv/dir.c
- *  Copyright (C) 1993  Bruno Haible
- *
- *  SystemV/Coherent directory handling functions
- */
-
-#include <linux/pagemap.h>
-#include <linux/highmem.h>
-#include <linux/swap.h>
-#include "sysv.h"
-
-static int sysv_readdir(struct file *, struct dir_context *);
-
-const struct file_operations sysv_dir_operations = {
-	.llseek		= generic_file_llseek,
-	.read		= generic_read_dir,
-	.iterate_shared	= sysv_readdir,
-	.fsync		= generic_file_fsync,
-};
-
-static void dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
-{
-	struct address_space *mapping = page->mapping;
-	struct inode *dir = mapping->host;
-
-	block_write_end(NULL, mapping, pos, len, len, page, NULL);
-	if (pos+len > dir->i_size) {
-		i_size_write(dir, pos+len);
-		mark_inode_dirty(dir);
-	}
-	unlock_page(page);
-}
-
-static int sysv_handle_dirsync(struct inode *dir)
-{
-	int err;
-
-	err = filemap_write_and_wait(dir->i_mapping);
-	if (!err)
-		err = sync_inode_metadata(dir, 1);
-	return err;
-}
-
-/*
- * Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
- * rules documented in mm/highmem.rst.
- *
- * NOTE: sysv_find_entry() and sysv_dotdot() act as calls to dir_get_page()
- * and must be treated accordingly for nesting purposes.
- */
-static void *dir_get_page(struct inode *dir, unsigned long n, struct page **p)
-{
-	struct address_space *mapping = dir->i_mapping;
-	struct page *page = read_mapping_page(mapping, n, NULL);
-	if (IS_ERR(page))
-		return ERR_CAST(page);
-	*p = page;
-	return kmap_local_page(page);
-}
-
-static int sysv_readdir(struct file *file, struct dir_context *ctx)
-{
-	unsigned long pos = ctx->pos;
-	struct inode *inode = file_inode(file);
-	struct super_block *sb = inode->i_sb;
-	unsigned long npages = dir_pages(inode);
-	unsigned offset;
-	unsigned long n;
-
-	ctx->pos = pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
-	if (pos >= inode->i_size)
-		return 0;
-
-	offset = pos & ~PAGE_MASK;
-	n = pos >> PAGE_SHIFT;
-
-	for ( ; n < npages; n++, offset = 0) {
-		char *kaddr, *limit;
-		struct sysv_dir_entry *de;
-		struct page *page;
-
-		kaddr = dir_get_page(inode, n, &page);
-		if (IS_ERR(kaddr))
-			continue;
-		de = (struct sysv_dir_entry *)(kaddr+offset);
-		limit = kaddr + PAGE_SIZE - SYSV_DIRSIZE;
-		for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) {
-			char *name = de->name;
-
-			if (!de->inode)
-				continue;
-
-			if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
-					fs16_to_cpu(SYSV_SB(sb), de->inode),
-					DT_UNKNOWN)) {
-				unmap_and_put_page(page, kaddr);
-				return 0;
-			}
-		}
-		unmap_and_put_page(page, kaddr);
-	}
-	return 0;
-}
-
-/* compare strings: name[0..len-1] (not zero-terminated) and
- * buffer[0..] (filled with zeroes up to buffer[0..maxlen-1])
- */
-static inline int namecompare(int len, int maxlen,
-	const char * name, const char * buffer)
-{
-	if (len < maxlen && buffer[len])
-		return 0;
-	return !memcmp(name, buffer, len);
-}
-
-/*
- *	sysv_find_entry()
- *
- * finds an entry in the specified directory with the wanted name. It
- * returns the cache buffer in which the entry was found, and the entry
- * itself (as a parameter - res_dir). It does NOT read the inode of the
- * entry - you'll have to do that yourself if you want to.
- *
- * On Success unmap_and_put_page() should be called on *res_page.
- *
- * sysv_find_entry() acts as a call to dir_get_page() and must be treated
- * accordingly for nesting purposes.
- */
-struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_page)
-{
-	const char * name = dentry->d_name.name;
-	int namelen = dentry->d_name.len;
-	struct inode * dir = d_inode(dentry->d_parent);
-	unsigned long start, n;
-	unsigned long npages = dir_pages(dir);
-	struct page *page = NULL;
-	struct sysv_dir_entry *de;
-
-	*res_page = NULL;
-
-	start = SYSV_I(dir)->i_dir_start_lookup;
-	if (start >= npages)
-		start = 0;
-	n = start;
-
-	do {
-		char *kaddr = dir_get_page(dir, n, &page);
-
-		if (!IS_ERR(kaddr)) {
-			de = (struct sysv_dir_entry *)kaddr;
-			kaddr += PAGE_SIZE - SYSV_DIRSIZE;
-			for ( ; (char *) de <= kaddr ; de++) {
-				if (!de->inode)
-					continue;
-				if (namecompare(namelen, SYSV_NAMELEN,
-							name, de->name))
-					goto found;
-			}
-			unmap_and_put_page(page, kaddr);
-		}
-
-		if (++n >= npages)
-			n = 0;
-	} while (n != start);
-
-	return NULL;
-
-found:
-	SYSV_I(dir)->i_dir_start_lookup = n;
-	*res_page = page;
-	return de;
-}
-
-int sysv_add_link(struct dentry *dentry, struct inode *inode)
-{
-	struct inode *dir = d_inode(dentry->d_parent);
-	const char * name = dentry->d_name.name;
-	int namelen = dentry->d_name.len;
-	struct page *page = NULL;
-	struct sysv_dir_entry * de;
-	unsigned long npages = dir_pages(dir);
-	unsigned long n;
-	char *kaddr;
-	loff_t pos;
-	int err;
-
-	/* We take care of directory expansion in the same loop */
-	for (n = 0; n <= npages; n++) {
-		kaddr = dir_get_page(dir, n, &page);
-		if (IS_ERR(kaddr))
-			return PTR_ERR(kaddr);
-		de = (struct sysv_dir_entry *)kaddr;
-		kaddr += PAGE_SIZE - SYSV_DIRSIZE;
-		while ((char *)de <= kaddr) {
-			if (!de->inode)
-				goto got_it;
-			err = -EEXIST;
-			if (namecompare(namelen, SYSV_NAMELEN, name, de->name)) 
-				goto out_page;
-			de++;
-		}
-		unmap_and_put_page(page, kaddr);
-	}
-	BUG();
-	return -EINVAL;
-
-got_it:
-	pos = page_offset(page) + offset_in_page(de);
-	lock_page(page);
-	err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
-	if (err)
-		goto out_unlock;
-	memcpy (de->name, name, namelen);
-	memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
-	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
-	dir_commit_chunk(page, pos, SYSV_DIRSIZE);
-	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
-	mark_inode_dirty(dir);
-	err = sysv_handle_dirsync(dir);
-out_page:
-	unmap_and_put_page(page, kaddr);
-	return err;
-out_unlock:
-	unlock_page(page);
-	goto out_page;
-}
-
-int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)
-{
-	struct inode *inode = page->mapping->host;
-	loff_t pos = page_offset(page) + offset_in_page(de);
-	int err;
-
-	lock_page(page);
-	err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
-	if (err) {
-		unlock_page(page);
-		return err;
-	}
-	de->inode = 0;
-	dir_commit_chunk(page, pos, SYSV_DIRSIZE);
-	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
-	mark_inode_dirty(inode);
-	return sysv_handle_dirsync(inode);
-}
-
-int sysv_make_empty(struct inode *inode, struct inode *dir)
-{
-	struct page *page = grab_cache_page(inode->i_mapping, 0);
-	struct sysv_dir_entry * de;
-	char *base;
-	int err;
-
-	if (!page)
-		return -ENOMEM;
-	err = sysv_prepare_chunk(page, 0, 2 * SYSV_DIRSIZE);
-	if (err) {
-		unlock_page(page);
-		goto fail;
-	}
-	base = kmap_local_page(page);
-	memset(base, 0, PAGE_SIZE);
-
-	de = (struct sysv_dir_entry *) base;
-	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
-	strcpy(de->name,".");
-	de++;
-	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
-	strcpy(de->name,"..");
-
-	kunmap_local(base);
-	dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
-	err = sysv_handle_dirsync(inode);
-fail:
-	put_page(page);
-	return err;
-}
-
-/*
- * routine to check that the specified directory is empty (for rmdir)
- */
-int sysv_empty_dir(struct inode * inode)
-{
-	struct super_block *sb = inode->i_sb;
-	struct page *page = NULL;
-	unsigned long i, npages = dir_pages(inode);
-	char *kaddr;
-
-	for (i = 0; i < npages; i++) {
-		struct sysv_dir_entry *de;
-
-		kaddr = dir_get_page(inode, i, &page);
-		if (IS_ERR(kaddr))
-			continue;
-
-		de = (struct sysv_dir_entry *)kaddr;
-		kaddr += PAGE_SIZE-SYSV_DIRSIZE;
-
-		for ( ;(char *)de <= kaddr; de++) {
-			if (!de->inode)
-				continue;
-			/* check for . and .. */
-			if (de->name[0] != '.')
-				goto not_empty;
-			if (!de->name[1]) {
-				if (de->inode == cpu_to_fs16(SYSV_SB(sb),
-							inode->i_ino))
-					continue;
-				goto not_empty;
-			}
-			if (de->name[1] != '.' || de->name[2])
-				goto not_empty;
-		}
-		unmap_and_put_page(page, kaddr);
-	}
-	return 1;
-
-not_empty:
-	unmap_and_put_page(page, kaddr);
-	return 0;
-}
-
-/* Releases the page */
-int sysv_set_link(struct sysv_dir_entry *de, struct page *page,
-	struct inode *inode)
-{
-	struct inode *dir = page->mapping->host;
-	loff_t pos = page_offset(page) + offset_in_page(de);
-	int err;
-
-	lock_page(page);
-	err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
-	if (err) {
-		unlock_page(page);
-		return err;
-	}
-	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
-	dir_commit_chunk(page, pos, SYSV_DIRSIZE);
-	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
-	mark_inode_dirty(dir);
-	return sysv_handle_dirsync(inode);
-}
-
-/*
- * Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
- * rules documented in mm/highmem.rst.
- *
- * sysv_dotdot() acts as a call to dir_get_page() and must be treated
- * accordingly for nesting purposes.
- */
-struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct page **p)
-{
-	struct sysv_dir_entry *de = dir_get_page(dir, 0, p);
-
-	if (IS_ERR(de))
-		return NULL;
-	/* ".." is the second directory entry */
-	return de + 1;
-}
-
-ino_t sysv_inode_by_name(struct dentry *dentry)
-{
-	struct page *page;
-	struct sysv_dir_entry *de = sysv_find_entry (dentry, &page);
-	ino_t res = 0;
-	
-	if (de) {
-		res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
-		unmap_and_put_page(page, de);
-	}
-	return res;
-}