fs/erofs/xattr.c

31 	struct erofs_xattr_iter it;
57 	 * 1) it is not enough to contain erofs_xattr_ibody_header then
58 	 *    ->xattr_isize should be 0 (it means no xattr);
59 	 * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk
79 	it.buf = __EROFS_BUF_INITIALIZER;
80 	ret = erofs_init_metabuf(&it.buf, sb, erofs_inode_in_metabox(inode));
83 	it.pos = erofs_iloc(inode) + vi->inode_isize;
86 	it.kaddr = erofs_bread(&it.buf, it.pos, true);
87 	if (IS_ERR(it.kaddr)) {
88 		ret = PTR_ERR(it.kaddr);
92 	ih = it.kaddr;
98 		erofs_put_metabuf(&it.buf);
104 	it.pos += sizeof(struct erofs_xattr_ibody_header);
107 		it.kaddr = erofs_bread(&it.buf, it.pos, true);
108 		if (IS_ERR(it.kaddr)) {
111 			ret = PTR_ERR(it.kaddr);
114 		vi->xattr_shared_xattrs[i] = le32_to_cpu(*(__le32 *)it.kaddr);
115 		it.pos += sizeof(__le32);
117 	erofs_put_metabuf(&it.buf);
180 static int erofs_xattr_copy_to_buffer(struct erofs_xattr_iter *it,
184 	struct super_block *sb = it->sb;
188 		it->kaddr = erofs_bread(&it->buf, it->pos, true);
189 		if (IS_ERR(it->kaddr))
190 			return PTR_ERR(it->kaddr);
192 		src = it->kaddr;
194 				erofs_blkoff(sb, it->pos), len - processed);
195 		memcpy(it->buffer + it->buffer_ofs, src, slice);
196 		it->buffer_ofs += slice;
197 		it->pos += slice;
202 static int erofs_listxattr_foreach(struct erofs_xattr_iter *it)
210 	entry = *(struct erofs_xattr_entry *)it->kaddr;
211 	it->pos += sizeof(struct erofs_xattr_entry);
215 		struct erofs_sb_info *sbi = EROFS_SB(it->sb);
226 	prefix = erofs_xattr_prefix(base_index, it->dentry);
232 	if (!it->buffer) {
233 		it->buffer_ofs += name_total;
237 	if (it->buffer_ofs + name_total > it->buffer_size)
240 	memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);
241 	memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len);
242 	it->buffer_ofs += prefix_len + infix_len;
245 	err = erofs_xattr_copy_to_buffer(it, entry.e_name_len);
249 	it->buffer[it->buffer_ofs++] = '\0';
253 static int erofs_getxattr_foreach(struct erofs_xattr_iter *it)
255 	struct super_block *sb = it->sb;
260 	entry = *(struct erofs_xattr_entry *)it->kaddr;
261 	it->pos += sizeof(struct erofs_xattr_entry);
273 		if (it->index != pf->prefix->base_index ||
274 		    it->name.len != entry.e_name_len + pf->infix_len)
277 		if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len))
280 		it->infix_len = pf->infix_len;
282 		if (it->index != entry.e_name_index ||
283 		    it->name.len != entry.e_name_len)
286 		it->infix_len = 0;
291 		it->kaddr = erofs_bread(&it->buf, it->pos, true);
292 		if (IS_ERR(it->kaddr))
293 			return PTR_ERR(it->kaddr);
296 				sb->s_blocksize - erofs_blkoff(sb, it->pos),
298 		if (memcmp(it->name.name + it->infix_len + processed,
299 			   it->kaddr, slice))
301 		it->pos += slice;
305 	if (!it->buffer) {
306 		it->buffer_ofs = value_sz;
310 	if (it->buffer_size < value_sz)
313 	return erofs_xattr_copy_to_buffer(it, value_sz);
316 static int erofs_xattr_iter_inline(struct erofs_xattr_iter *it,
331 	ret = erofs_init_metabuf(&it->buf, it->sb, erofs_inode_in_metabox(inode));
335 	it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz;
338 		it->kaddr = erofs_bread(&it->buf, it->pos, true);
339 		if (IS_ERR(it->kaddr))
340 			return PTR_ERR(it->kaddr);
342 		entry_sz = erofs_xattr_entry_size(it->kaddr);
349 		next_pos = it->pos + entry_sz;
352 			ret = erofs_getxattr_foreach(it);
354 			ret = erofs_listxattr_foreach(it);
358 		it->pos = next_pos;
363 static int erofs_xattr_iter_shared(struct erofs_xattr_iter *it,
367 	struct super_block *const sb = it->sb;
372 	ret = erofs_init_metabuf(&it->buf, sb,
378 		it->pos = erofs_pos(sb, sbi->xattr_blkaddr) +
380 		it->kaddr = erofs_bread(&it->buf, it->pos, true);
381 		if (IS_ERR(it->kaddr))
382 			return PTR_ERR(it->kaddr);
385 			ret = erofs_getxattr_foreach(it);
387 			ret = erofs_listxattr_foreach(it);
399 	struct erofs_xattr_iter it;
419 	it.index = index;
420 	it.name = QSTR(name);
421 	if (it.name.len > EROFS_NAME_LEN)
424 	it.sb = inode->i_sb;
425 	it.buf = __EROFS_BUF_INITIALIZER;
426 	it.buffer = buffer;
427 	it.buffer_size = buffer_size;
428 	it.buffer_ofs = 0;
430 	ret = erofs_xattr_iter_inline(&it, inode, true);
432 		ret = erofs_xattr_iter_shared(&it, inode, true);
433 	erofs_put_metabuf(&it.buf);
434 	return ret ? ret : it.buffer_ofs;
440 	struct erofs_xattr_iter it;
449 	it.sb = dentry->d_sb;
450 	it.buf = __EROFS_BUF_INITIALIZER;
451 	it.dentry = dentry;
452 	it.buffer = buffer;
453 	it.buffer_size = buffer_size;
454 	it.buffer_ofs = 0;
456 	ret = erofs_xattr_iter_inline(&it, inode, false);
458 		ret = erofs_xattr_iter_shared(&it, inode, false);
461 	erofs_put_metabuf(&it.buf);
462 	return ret ? ret : it.buffer_ofs;