fs/squashfs/inode.c

8  * inode.c
14  * Inodes in Squashfs are identified by a 48-bit inode which encodes the
15  * location of the compressed metadata block containing the inode, and the byte
16  * offset into that block where the inode is placed (<block, offset>).
19  * (regular file, directory, device, etc.), the inode contents and length
22  * To further maximise compression, two types of regular file inode and
23  * directory inode are defined: inodes optimised for frequently occurring
40  * Initialise VFS inode with the base inode information common to all
41  * Squashfs inode types.  Sqsh_ino contains the unswapped base inode
44 static int squashfs_new_inode(struct super_block *sb, struct inode *inode,
51 	inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
52 	if (inode->i_ino == 0)
63 	i_uid_write(inode, i_uid);
64 	i_gid_write(inode, i_gid);
65 	inode_set_mtime(inode, le32_to_cpu(sqsh_ino->mtime), 0);
66 	inode_set_atime(inode, inode_get_mtime_sec(inode), 0);
67 	inode_set_ctime(inode, inode_get_mtime_sec(inode), 0);
68 	inode->i_mode = le16_to_cpu(sqsh_ino->mode);
69 	inode->i_size = 0;
75 struct inode *squashfs_iget(struct super_block *sb, long long ino,
78 	struct inode *inode = iget_locked(sb, ino_number);
83 	if (!inode)
85 	if (!(inode->i_state & I_NEW))
86 		return inode;
88 	err = squashfs_read_inode(inode, ino);
90 		iget_failed(inode);
94 	unlock_new_inode(inode);
95 	return inode;
100  * Initialise VFS inode by reading inode from inode table (compressed
103 int squashfs_read_inode(struct inode *inode, long long ino)
105 	struct super_block *sb = inode->i_sb;
116 	 * Read inode base common to all inode types.
123 	err = squashfs_new_inode(sb, inode, sqshb_ino);
157 		set_nlink(inode, 1);
158 		inode->i_size = le32_to_cpu(sqsh_ino->file_size);
159 		inode->i_fop = &generic_ro_fops;
160 		inode->i_mode |= S_IFREG;
161 		inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
162 		squashfs_i(inode)->fragment_block = frag_blk;
163 		squashfs_i(inode)->fragment_size = frag_size;
164 		squashfs_i(inode)->fragment_offset = frag_offset;
165 		squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
166 		squashfs_i(inode)->block_list_start = block;
167 		squashfs_i(inode)->offset = offset;
168 		inode->i_data.a_ops = &squashfs_aops;
170 		TRACE("File inode %x:%x, start_block %llx, block_list_start "
172 			offset, squashfs_i(inode)->start, block, offset);
201 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
202 		inode->i_size = le64_to_cpu(sqsh_ino->file_size);
203 		inode->i_op = &squashfs_inode_ops;
204 		inode->i_fop = &generic_ro_fops;
205 		inode->i_mode |= S_IFREG;
206 		inode->i_blocks = (inode->i_size -
209 		squashfs_i(inode)->fragment_block = frag_blk;
210 		squashfs_i(inode)->fragment_size = frag_size;
211 		squashfs_i(inode)->fragment_offset = frag_offset;
212 		squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
213 		squashfs_i(inode)->block_list_start = block;
214 		squashfs_i(inode)->offset = offset;
215 		inode->i_data.a_ops = &squashfs_aops;
217 		TRACE("File inode %x:%x, start_block %llx, block_list_start "
219 			offset, squashfs_i(inode)->start, block, offset);
230 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
231 		inode->i_size = le16_to_cpu(sqsh_ino->file_size);
232 		inode->i_op = &squashfs_dir_inode_ops;
233 		inode->i_fop = &squashfs_dir_ops;
234 		inode->i_mode |= S_IFDIR;
235 		squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
236 		squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
237 		squashfs_i(inode)->dir_idx_cnt = 0;
238 		squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
240 		TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
242 				squashfs_i(inode)->start,
255 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
256 		inode->i_size = le32_to_cpu(sqsh_ino->file_size);
257 		inode->i_op = &squashfs_dir_inode_ops;
258 		inode->i_fop = &squashfs_dir_ops;
259 		inode->i_mode |= S_IFDIR;
260 		squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
261 		squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
262 		squashfs_i(inode)->dir_idx_start = block;
263 		squashfs_i(inode)->dir_idx_offset = offset;
264 		squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
265 		squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
267 		TRACE("Long directory inode %x:%x, start_block %llx, offset "
269 				squashfs_i(inode)->start,
282 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
283 		inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
284 		inode->i_op = &squashfs_symlink_inode_ops;
285 		inode_nohighmem(inode);
286 		inode->i_data.a_ops = &squashfs_symlink_aops;
287 		inode->i_mode |= S_IFLNK;
288 		squashfs_i(inode)->start = block;
289 		squashfs_i(inode)->offset = offset;
295 						&offset, inode->i_size);
305 		TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
321 			inode->i_mode |= S_IFCHR;
323 			inode->i_mode |= S_IFBLK;
324 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
326 		init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
328 		TRACE("Device inode %x:%x, rdev %x\n",
343 			inode->i_mode |= S_IFCHR;
345 			inode->i_mode |= S_IFBLK;
347 		inode->i_op = &squashfs_inode_ops;
348 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
350 		init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
352 		TRACE("Device inode %x:%x, rdev %x\n",
366 			inode->i_mode |= S_IFIFO;
368 			inode->i_mode |= S_IFSOCK;
369 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
370 		init_special_inode(inode, inode->i_mode, 0);
383 			inode->i_mode |= S_IFIFO;
385 			inode->i_mode |= S_IFSOCK;
387 		inode->i_op = &squashfs_inode_ops;
388 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
389 		init_special_inode(inode, inode->i_mode, 0);
393 		ERROR("Unknown inode type %d in squashfs_iget!\n", type);
399 					&squashfs_i(inode)->xattr_count,
400 					&squashfs_i(inode)->xattr_size,
401 					&squashfs_i(inode)->xattr);
404 		inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
407 		squashfs_i(inode)->xattr_count = 0;
412 	ERROR("Unable to read inode 0x%llx\n", ino);