1 // SPDX-License-Identifier: GPL-2.0-only
22 static sector_t _efs_bmap(struct address_space *mapping, sector_t block)  in _efs_bmap()  argument
24 	return generic_block_bmap(mapping,block,efs_get_block);  in _efs_bmap()
36 	 * the bits so that dst ends up in cpu byte-order.  in extent_copy()
39 	dst->cooked.ex_magic  =  (unsigned int) src->raw[0];  in extent_copy()
40 	dst->cooked.ex_bn     = ((unsigned int) src->raw[1] << 16) |  in extent_copy()
41 				((unsigned int) src->raw[2] <<  8) |  in extent_copy()
42 				((unsigned int) src->raw[3] <<  0);  in extent_copy()
43 	dst->cooked.ex_length =  (unsigned int) src->raw[4];  in extent_copy()
44 	dst->cooked.ex_offset = ((unsigned int) src->raw[5] << 16) |  in extent_copy()
45 				((unsigned int) src->raw[6] <<  8) |  in extent_copy()
46 				((unsigned int) src->raw[7] <<  0);  in extent_copy()
58 	efs_block_t block, offset;  in efs_iget()  local
64 		return ERR_PTR(-ENOMEM);  in efs_iget()
65 	if (!(inode->i_state & I_NEW))  in efs_iget()
76 	** work out the inode block index, (considering initially that the  in efs_iget()
77 	** inodes are stored as consecutive blocks). then work out the block  in efs_iget()
79 	** offset of the inode within that block.  in efs_iget()
82 	inode_index = inode->i_ino /  in efs_iget()
85 	block = sb->fs_start + sb->first_block +   in efs_iget()
86 		(sb->group_size * (inode_index / sb->inode_blocks)) +  in efs_iget()
87 		(inode_index % sb->inode_blocks);  in efs_iget()
89 	offset = (inode->i_ino %  in efs_iget()
93 	bh = sb_bread(inode->i_sb, block);  in efs_iget()
95 		pr_warn("%s() failed at block %d\n", __func__, block);  in efs_iget()
99 	efs_inode = (struct efs_dinode *) (bh->b_data + offset);  in efs_iget()
101 	inode->i_mode  = be16_to_cpu(efs_inode->di_mode);  in efs_iget()
102 	set_nlink(inode, be16_to_cpu(efs_inode->di_nlink));  in efs_iget()
103 	i_uid_write(inode, (uid_t)be16_to_cpu(efs_inode->di_uid));  in efs_iget()
104 	i_gid_write(inode, (gid_t)be16_to_cpu(efs_inode->di_gid));  in efs_iget()
105 	inode->i_size  = be32_to_cpu(efs_inode->di_size);  in efs_iget()
106 	inode_set_atime(inode, be32_to_cpu(efs_inode->di_atime), 0);  in efs_iget()
107 	inode_set_mtime(inode, be32_to_cpu(efs_inode->di_mtime), 0);  in efs_iget()
108 	inode_set_ctime(inode, be32_to_cpu(efs_inode->di_ctime), 0);  in efs_iget()
111 	if (inode->i_size == 0) {  in efs_iget()
112 		inode->i_blocks = 0;  in efs_iget()
114 		inode->i_blocks = ((inode->i_size - 1) >> EFS_BLOCKSIZE_BITS) + 1;  in efs_iget()
117 	rdev = be16_to_cpu(efs_inode->di_u.di_dev.odev);  in efs_iget()
119 		rdev = be32_to_cpu(efs_inode->di_u.di_dev.ndev);  in efs_iget()
128 	in->numextents = be16_to_cpu(efs_inode->di_numextents);  in efs_iget()
129 	in->lastextent = 0;  in efs_iget()
133 		extent_copy(&(efs_inode->di_u.di_extents[i]), &(in->extents[i]));  in efs_iget()
134 		if (i < in->numextents && in->extents[i].cooked.ex_magic != 0) {  in efs_iget()
136 				i, inode->i_ino);  in efs_iget()
144 		 inode->i_ino, in->numextents, inode->i_mode);  in efs_iget()
145 	switch (inode->i_mode & S_IFMT) {  in efs_iget()
147 			inode->i_op = &efs_dir_inode_operations;   in efs_iget()
148 			inode->i_fop = &efs_dir_operations;   in efs_iget()
151 			inode->i_fop = &generic_ro_fops;  in efs_iget()
152 			inode->i_data.a_ops = &efs_aops;  in efs_iget()
155 			inode->i_op = &page_symlink_inode_operations;  in efs_iget()
157 			inode->i_data.a_ops = &efs_symlink_aops;  in efs_iget()
162 			init_special_inode(inode, inode->i_mode, device);  in efs_iget()
165 			pr_warn("unsupported inode mode %o\n", inode->i_mode);  in efs_iget()
174 	pr_warn("failed to read inode %lu\n", inode->i_ino);  in efs_iget()
176 	return ERR_PTR(-EIO);  in efs_iget()
180 efs_extent_check(efs_extent *ptr, efs_block_t block, struct efs_sb_info *sb) {  in efs_extent_check()  argument
183 	efs_block_t offset;  in efs_extent_check()  local
186 	 * given an extent and a logical block within a file,  in efs_extent_check()
187 	 * can this block be found within this extent ?  in efs_extent_check()
189 	start  = ptr->cooked.ex_bn;  in efs_extent_check()
190 	length = ptr->cooked.ex_length;  in efs_extent_check()
191 	offset = ptr->cooked.ex_offset;  in efs_extent_check()
193 	if ((block >= offset) && (block < offset+length)) {  in efs_extent_check()
194 		return(sb->fs_start + start + block - offset);  in efs_extent_check()
200 efs_block_t efs_map_block(struct inode *inode, efs_block_t block) {  in efs_map_block()  argument
201 	struct efs_sb_info    *sb = SUPER_INFO(inode->i_sb);  in efs_map_block()
210 	last = in->lastextent;  in efs_map_block()
212 	if (in->numextents <= EFS_DIRECTEXTENTS) {  in efs_map_block()
214 		if ((result = efs_extent_check(&in->extents[last], block, sb)))  in efs_map_block()
218 		if (in->numextents == 1) {  in efs_map_block()
223 		direxts = in->numextents;  in efs_map_block()
230 			cur = (last + dirext) % in->numextents;  in efs_map_block()
231 			if ((result = efs_extent_check(&in->extents[cur], block, sb))) {  in efs_map_block()
232 				in->lastextent = cur;  in efs_map_block()
237 		pr_err("%s() failed to map block %u (dir)\n", __func__, block);  in efs_map_block()
241 	pr_debug("%s(): indirect search for logical block %u\n",  in efs_map_block()
242 		 __func__, block);  in efs_map_block()
243 	direxts = in->extents[0].cooked.ex_offset;  in efs_map_block()
244 	indexts = in->numextents;  in efs_map_block()
258 			ibase += in->extents[dirext].cooked.ex_length *  in efs_map_block()
264 			pr_err("couldn't find direct extent for indirect extent %d (block %u)\n",  in efs_map_block()
265 			       cur, block);  in efs_map_block()
270 		/* work out block number and offset of this indirect extent */  in efs_map_block()
271 		iblock = sb->fs_start + in->extents[dirext].cooked.ex_bn +  in efs_map_block()
272 			(cur - ibase) /  in efs_map_block()
274 		ioffset = (cur - ibase) %  in efs_map_block()
280 			bh = sb_bread(inode->i_sb, iblock);  in efs_map_block()
282 				pr_err("%s() failed at block %d\n",  in efs_map_block()
286 			pr_debug("%s(): read indirect extent block %d\n",  in efs_map_block()
292 		exts = (efs_extent *) bh->b_data;  in efs_map_block()
297 			pr_err("extent %d has bad magic number in block %d\n",  in efs_map_block()
303 		if ((result = efs_extent_check(&ext, block, sb))) {  in efs_map_block()
305 			in->lastextent = cur;  in efs_map_block()
310 	pr_err("%s() failed to map block %u (indir)\n", __func__, block);  in efs_map_block()