1 // SPDX-License-Identifier: GPL-2.0
33 	struct address_space *mapping = folio->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_folio()/folio_release_kmap() must be nested according to the
59  * and must be treated accordingly for nesting purposes.
64 	struct folio *folio = read_mapping_folio(dir->i_mapping, n, NULL);  in dir_get_folio()
74 	unsigned long pos = ctx->pos;  in sysv_readdir()
76 	struct super_block *sb = inode->i_sb;  in sysv_readdir()
81 	ctx->pos = pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);  in sysv_readdir()
82 	if (pos >= inode->i_size)  in sysv_readdir()
90 		struct sysv_dir_entry *de;  in sysv_readdir()  local
96 		de = (struct sysv_dir_entry *)(kaddr+offset);  in sysv_readdir()
97 		limit = kaddr + PAGE_SIZE - SYSV_DIRSIZE;  in sysv_readdir()
98 		for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) {  in sysv_readdir()
99 			char *name = de->name;  in sysv_readdir()
101 			if (!de->inode)  in sysv_readdir()
105 					fs16_to_cpu(SYSV_SB(sb), de->inode),  in sysv_readdir()
116 /* compare strings: name[0..len-1] (not zero-terminated) and
117  * buffer[0..] (filled with zeroes up to buffer[0..maxlen-1])
132  * entry - you'll have to do that yourself if you want to.
134  * On Success folio_release_kmap() should be called on *foliop.
136  * sysv_find_entry() acts as a call to dir_get_folio() 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()
146 	struct sysv_dir_entry *de;  in sysv_find_entry()  local
148 	start = SYSV_I(dir)->i_dir_start_lookup;  in sysv_find_entry()
157 			de = (struct sysv_dir_entry *)kaddr;  in sysv_find_entry()
158 			kaddr += folio_size(*foliop) - SYSV_DIRSIZE;  in sysv_find_entry()
159 			for ( ; (char *) de <= kaddr ; de++) {  in sysv_find_entry()
160 				if (!de->inode)  in sysv_find_entry()
163 							name, de->name))  in sysv_find_entry()
176 	SYSV_I(dir)->i_dir_start_lookup = n;  in sysv_find_entry()
177 	return de;  in sysv_find_entry()
182 	struct inode *dir = d_inode(dentry->d_parent);  in sysv_add_link()
183 	const char * name = dentry->d_name.name;  in sysv_add_link()
184 	int namelen = dentry->d_name.len;  in sysv_add_link()
186 	struct sysv_dir_entry * de;  in sysv_add_link()  local
198 		de = (struct sysv_dir_entry *)kaddr;  in sysv_add_link()
199 		kaddr += PAGE_SIZE - SYSV_DIRSIZE;  in sysv_add_link()
200 		while ((char *)de <= kaddr) {  in sysv_add_link()
201 			if (!de->inode)  in sysv_add_link()
203 			err = -EEXIST;  in sysv_add_link()
204 			if (namecompare(namelen, SYSV_NAMELEN, name, de->name))   in sysv_add_link()
206 			de++;  in sysv_add_link()
211 	return -EINVAL;  in sysv_add_link()
214 	pos = folio_pos(folio) + offset_in_folio(folio, de);  in sysv_add_link()
219 	memcpy (de->name, name, namelen);  in sysv_add_link()
220 	memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);  in sysv_add_link()
221 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);  in sysv_add_link()
234 int sysv_delete_entry(struct sysv_dir_entry *de, struct folio *folio)  in sysv_delete_entry()  argument
236 	struct inode *inode = folio->mapping->host;  in sysv_delete_entry()
237 	loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);  in sysv_delete_entry()
246 	de->inode = 0;  in sysv_delete_entry()
255 	struct folio *folio = filemap_grab_folio(inode->i_mapping, 0);  in sysv_make_empty()
256 	struct sysv_dir_entry * de;  in sysv_make_empty()  local
270 	de = (struct sysv_dir_entry *)kaddr;  in sysv_make_empty()
271 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);  in sysv_make_empty()
272 	strcpy(de->name,".");  in sysv_make_empty()
273 	de++;  in sysv_make_empty()
274 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);  in sysv_make_empty()
275 	strcpy(de->name,"..");  in sysv_make_empty()
290 	struct super_block *sb = inode->i_sb;  in sysv_empty_dir()
296 		struct sysv_dir_entry *de;  in sysv_empty_dir()  local
302 		de = (struct sysv_dir_entry *)kaddr;  in sysv_empty_dir()
303 		kaddr += folio_size(folio) - SYSV_DIRSIZE;  in sysv_empty_dir()
305 		for ( ;(char *)de <= kaddr; de++) {  in sysv_empty_dir()
306 			if (!de->inode)  in sysv_empty_dir()
309 			if (de->name[0] != '.')  in sysv_empty_dir()
311 			if (!de->name[1]) {  in sysv_empty_dir()
312 				if (de->inode == cpu_to_fs16(SYSV_SB(sb),  in sysv_empty_dir()
313 							inode->i_ino))  in sysv_empty_dir()
317 			if (de->name[1] != '.' || de->name[2])  in sysv_empty_dir()
330 int sysv_set_link(struct sysv_dir_entry *de, struct folio *folio,  in sysv_set_link()  argument
333 	struct inode *dir = folio->mapping->host;  in sysv_set_link()
334 	loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);  in sysv_set_link()
343 	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);  in sysv_set_link()
351  * Calls to dir_get_folio()/folio_release_kmap() must be nested according to the
354  * sysv_dotdot() acts as a call to dir_get_folio() and must be treated
359 	struct sysv_dir_entry *de = dir_get_folio(dir, 0, foliop);  in sysv_dotdot()  local
361 	if (IS_ERR(de))  in sysv_dotdot()
364 	return de + 1;  in sysv_dotdot()
370 	struct sysv_dir_entry *de = sysv_find_entry (dentry, &folio);  in sysv_inode_by_name()  local
373 	if (de) {  in sysv_inode_by_name()
374 		res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);  in sysv_inode_by_name()
375 		folio_release_kmap(folio, de);  in sysv_inode_by_name()