1 // SPDX-License-Identifier: GPL-2.0
33 	struct address_space *mapping = page->mapping;  in dir_commit_chunk()
34 	struct inode *dir = mapping->host;  in dir_commit_chunk()
37 	if (pos+len > dir->i_size) {  in dir_commit_chunk()
48 	err = filemap_write_and_wait(dir->i_mapping);  in sysv_handle_dirsync()
55  * Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
59  * and must be treated accordingly for nesting purposes.
63 	struct address_space *mapping = dir->i_mapping;  in dir_get_page()
73 	unsigned long pos = ctx->pos;  in sysv_readdir()
75 	struct super_block *sb = inode->i_sb;  in sysv_readdir()
80 	ctx->pos = pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);  in sysv_readdir()
81 	if (pos >= inode->i_size)  in sysv_readdir()
89 		struct sysv_dir_entry *de;  in sysv_readdir()  local
95 		de = (struct sysv_dir_entry *)(kaddr+offset);  in sysv_readdir()
96 		limit = kaddr + PAGE_SIZE - SYSV_DIRSIZE;  in sysv_readdir()
97 		for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) {  in sysv_readdir()
98 			char *name = de->name;  in sysv_readdir()
100 			if (!de->inode)  in sysv_readdir()
104 					fs16_to_cpu(SYSV_SB(sb), de->inode),  in sysv_readdir()
115 /* compare strings: name[0..len-1] (not zero-terminated) and
116  * buffer[0..] (filled with zeroes up to buffer[0..maxlen-1])
131  * itself (as a parameter - res_dir). It does NOT read the inode of the
132  * entry - you'll have to do that yourself if you want to.
134  * On Success unmap_and_put_page() should be called on *res_page.
136  * sysv_find_entry() acts as a call to dir_get_page() and must be treated
141 	const char * name = dentry->d_name.name;  in sysv_find_entry()
142 	int namelen = dentry->d_name.len;  in sysv_find_entry()
143 	struct inode * dir = d_inode(dentry->d_parent);  in sysv_find_entry()
147 	struct sysv_dir_entry *de;  in sysv_find_entry()  local
151 	start = SYSV_I(dir)->i_dir_start_lookup;  in sysv_find_entry()
160 			de = (struct sysv_dir_entry *)kaddr;  in sysv_find_entry()
161 			kaddr += PAGE_SIZE - SYSV_DIRSIZE;  in sysv_find_entry()
162 			for ( ; (char *) de <= kaddr ; de++) {  in sysv_find_entry()
163 				if (!de->inode)  in sysv_find_entry()
166 							name, de->name))  in sysv_find_entry()
179 	SYSV_I(dir)->i_dir_start_lookup = n;  in sysv_find_entry()
181 	return de;  in sysv_find_entry()
186 	struct inode *dir = d_inode(dentry->d_parent);  in sysv_add_link()
187 	const char * name = dentry->d_name.name;  in sysv_add_link()
188 	int namelen = dentry->d_name.len;  in sysv_add_link()
190 	struct sysv_dir_entry * de;  in sysv_add_link()  local
202 		de = (struct sysv_dir_entry *)kaddr;  in sysv_add_link()
203 		kaddr += PAGE_SIZE - SYSV_DIRSIZE;  in sysv_add_link()
204 		while ((char *)de <= kaddr) {  in sysv_add_link()
205 			if (!de->inode)  in sysv_add_link()
207 			err = -EEXIST;  in sysv_add_link()
208 			if (namecompare(namelen, SYSV_NAMELEN, name, de->name))   in sysv_add_link()
210 			de++;  in sysv_add_link()
215 	return -EINVAL;  in sysv_add_link()
218 	pos = page_offset(page) + offset_in_page(de);  in sysv_add_link()
223 	memcpy (de->name, name, namelen);  in sysv_add_link()
224 	memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);  in sysv_add_link()
225 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);  in sysv_add_link()
227 	dir->i_mtime = inode_set_ctime_current(dir);  in sysv_add_link()
238 int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)  in sysv_delete_entry()  argument
240 	struct inode *inode = page->mapping->host;  in sysv_delete_entry()
241 	loff_t pos = page_offset(page) + offset_in_page(de);  in sysv_delete_entry()
250 	de->inode = 0;  in sysv_delete_entry()
252 	inode->i_mtime = inode_set_ctime_current(inode);  in sysv_delete_entry()
259 	struct page *page = grab_cache_page(inode->i_mapping, 0);  in sysv_make_empty()
260 	struct sysv_dir_entry * de;  in sysv_make_empty()  local
265 		return -ENOMEM;  in sysv_make_empty()
274 	de = (struct sysv_dir_entry *) base;  in sysv_make_empty()
275 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);  in sysv_make_empty()
276 	strcpy(de->name,".");  in sysv_make_empty()
277 	de++;  in sysv_make_empty()
278 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);  in sysv_make_empty()
279 	strcpy(de->name,"..");  in sysv_make_empty()
294 	struct super_block *sb = inode->i_sb;  in sysv_empty_dir()
300 		struct sysv_dir_entry *de;  in sysv_empty_dir()  local
306 		de = (struct sysv_dir_entry *)kaddr;  in sysv_empty_dir()
307 		kaddr += PAGE_SIZE-SYSV_DIRSIZE;  in sysv_empty_dir()
309 		for ( ;(char *)de <= kaddr; de++) {  in sysv_empty_dir()
310 			if (!de->inode)  in sysv_empty_dir()
313 			if (de->name[0] != '.')  in sysv_empty_dir()
315 			if (!de->name[1]) {  in sysv_empty_dir()
316 				if (de->inode == cpu_to_fs16(SYSV_SB(sb),  in sysv_empty_dir()
317 							inode->i_ino))  in sysv_empty_dir()
321 			if (de->name[1] != '.' || de->name[2])  in sysv_empty_dir()
334 int sysv_set_link(struct sysv_dir_entry *de, struct page *page,  in sysv_set_link()  argument
337 	struct inode *dir = page->mapping->host;  in sysv_set_link()
338 	loff_t pos = page_offset(page) + offset_in_page(de);  in sysv_set_link()
347 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);  in sysv_set_link()
349 	dir->i_mtime = inode_set_ctime_current(dir);  in sysv_set_link()
355  * Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
358  * sysv_dotdot() acts as a call to dir_get_page() and must be treated
363 	struct sysv_dir_entry *de = dir_get_page(dir, 0, p);  in sysv_dotdot()  local
365 	if (IS_ERR(de))  in sysv_dotdot()
368 	return de + 1;  in sysv_dotdot()
374 	struct sysv_dir_entry *de = sysv_find_entry (dentry, &page);  in sysv_inode_by_name()  local
377 	if (de) {  in sysv_inode_by_name()
378 		res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);  in sysv_inode_by_name()
379 		unmap_and_put_page(page, de);  in sysv_inode_by_name()