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1/*
2 * Squashfs - a compressed read only filesystem for Linux
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
5 * Phillip Lougher <phillip@squashfs.org.uk>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2,
10 * or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 *
21 * inode.c
22 */
23
24/*
25 * This file implements code to create and read inodes from disk.
26 *
27 * Inodes in Squashfs are identified by a 48-bit inode which encodes the
28 * location of the compressed metadata block containing the inode, and the byte
29 * offset into that block where the inode is placed (<block, offset>).
30 *
31 * To maximise compression there are different inodes for each file type
32 * (regular file, directory, device, etc.), the inode contents and length
33 * varying with the type.
34 *
35 * To further maximise compression, two types of regular file inode and
36 * directory inode are defined: inodes optimised for frequently occurring
37 * regular files and directories, and extended types where extra
38 * information has to be stored.
39 */
40
41#include <linux/fs.h>
42#include <linux/vfs.h>
43#include <linux/xattr.h>
44
45#include "squashfs_fs.h"
46#include "squashfs_fs_sb.h"
47#include "squashfs_fs_i.h"
48#include "squashfs.h"
49#include "xattr.h"
50
51/*
52 * Initialise VFS inode with the base inode information common to all
53 * Squashfs inode types. Sqsh_ino contains the unswapped base inode
54 * off disk.
55 */
56static int squashfs_new_inode(struct super_block *sb, struct inode *inode,
57 struct squashfs_base_inode *sqsh_ino)
58{
59 int err;
60
61 err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &inode->i_uid);
62 if (err)
63 return err;
64
65 err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &inode->i_gid);
66 if (err)
67 return err;
68
69 inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
70 inode->i_mtime.tv_sec = le32_to_cpu(sqsh_ino->mtime);
71 inode->i_atime.tv_sec = inode->i_mtime.tv_sec;
72 inode->i_ctime.tv_sec = inode->i_mtime.tv_sec;
73 inode->i_mode = le16_to_cpu(sqsh_ino->mode);
74 inode->i_size = 0;
75
76 return err;
77}
78
79
80struct inode *squashfs_iget(struct super_block *sb, long long ino,
81 unsigned int ino_number)
82{
83 struct inode *inode = iget_locked(sb, ino_number);
84 int err;
85
86 TRACE("Entered squashfs_iget\n");
87
88 if (!inode)
89 return ERR_PTR(-ENOMEM);
90 if (!(inode->i_state & I_NEW))
91 return inode;
92
93 err = squashfs_read_inode(inode, ino);
94 if (err) {
95 iget_failed(inode);
96 return ERR_PTR(err);
97 }
98
99 unlock_new_inode(inode);
100 return inode;
101}
102
103
104/*
105 * Initialise VFS inode by reading inode from inode table (compressed
106 * metadata). The format and amount of data read depends on type.
107 */
108int squashfs_read_inode(struct inode *inode, long long ino)
109{
110 struct super_block *sb = inode->i_sb;
111 struct squashfs_sb_info *msblk = sb->s_fs_info;
112 u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
113 int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
114 union squashfs_inode squashfs_ino;
115 struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
116 int xattr_id = SQUASHFS_INVALID_XATTR;
117
118 TRACE("Entered squashfs_read_inode\n");
119
120 /*
121 * Read inode base common to all inode types.
122 */
123 err = squashfs_read_metadata(sb, sqshb_ino, &block,
124 &offset, sizeof(*sqshb_ino));
125 if (err < 0)
126 goto failed_read;
127
128 err = squashfs_new_inode(sb, inode, sqshb_ino);
129 if (err)
130 goto failed_read;
131
132 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
133 offset = SQUASHFS_INODE_OFFSET(ino);
134
135 type = le16_to_cpu(sqshb_ino->inode_type);
136 switch (type) {
137 case SQUASHFS_REG_TYPE: {
138 unsigned int frag_offset, frag;
139 int frag_size;
140 u64 frag_blk;
141 struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
142
143 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
144 sizeof(*sqsh_ino));
145 if (err < 0)
146 goto failed_read;
147
148 frag = le32_to_cpu(sqsh_ino->fragment);
149 if (frag != SQUASHFS_INVALID_FRAG) {
150 frag_offset = le32_to_cpu(sqsh_ino->offset);
151 frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
152 if (frag_size < 0) {
153 err = frag_size;
154 goto failed_read;
155 }
156 } else {
157 frag_blk = SQUASHFS_INVALID_BLK;
158 frag_size = 0;
159 frag_offset = 0;
160 }
161
162 inode->i_nlink = 1;
163 inode->i_size = le32_to_cpu(sqsh_ino->file_size);
164 inode->i_fop = &generic_ro_fops;
165 inode->i_mode |= S_IFREG;
166 inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
167 squashfs_i(inode)->fragment_block = frag_blk;
168 squashfs_i(inode)->fragment_size = frag_size;
169 squashfs_i(inode)->fragment_offset = frag_offset;
170 squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
171 squashfs_i(inode)->block_list_start = block;
172 squashfs_i(inode)->offset = offset;
173 inode->i_data.a_ops = &squashfs_aops;
174
175 TRACE("File inode %x:%x, start_block %llx, block_list_start "
176 "%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
177 offset, squashfs_i(inode)->start, block, offset);
178 break;
179 }
180 case SQUASHFS_LREG_TYPE: {
181 unsigned int frag_offset, frag;
182 int frag_size;
183 u64 frag_blk;
184 struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
185
186 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
187 sizeof(*sqsh_ino));
188 if (err < 0)
189 goto failed_read;
190
191 frag = le32_to_cpu(sqsh_ino->fragment);
192 if (frag != SQUASHFS_INVALID_FRAG) {
193 frag_offset = le32_to_cpu(sqsh_ino->offset);
194 frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
195 if (frag_size < 0) {
196 err = frag_size;
197 goto failed_read;
198 }
199 } else {
200 frag_blk = SQUASHFS_INVALID_BLK;
201 frag_size = 0;
202 frag_offset = 0;
203 }
204
205 xattr_id = le32_to_cpu(sqsh_ino->xattr);
206 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
207 inode->i_size = le64_to_cpu(sqsh_ino->file_size);
208 inode->i_op = &squashfs_inode_ops;
209 inode->i_fop = &generic_ro_fops;
210 inode->i_mode |= S_IFREG;
211 inode->i_blocks = ((inode->i_size -
212 le64_to_cpu(sqsh_ino->sparse) - 1) >> 9) + 1;
213
214 squashfs_i(inode)->fragment_block = frag_blk;
215 squashfs_i(inode)->fragment_size = frag_size;
216 squashfs_i(inode)->fragment_offset = frag_offset;
217 squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
218 squashfs_i(inode)->block_list_start = block;
219 squashfs_i(inode)->offset = offset;
220 inode->i_data.a_ops = &squashfs_aops;
221
222 TRACE("File inode %x:%x, start_block %llx, block_list_start "
223 "%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
224 offset, squashfs_i(inode)->start, block, offset);
225 break;
226 }
227 case SQUASHFS_DIR_TYPE: {
228 struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;
229
230 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
231 sizeof(*sqsh_ino));
232 if (err < 0)
233 goto failed_read;
234
235 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
236 inode->i_size = le16_to_cpu(sqsh_ino->file_size);
237 inode->i_op = &squashfs_dir_inode_ops;
238 inode->i_fop = &squashfs_dir_ops;
239 inode->i_mode |= S_IFDIR;
240 squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
241 squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
242 squashfs_i(inode)->dir_idx_cnt = 0;
243 squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
244
245 TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
246 SQUASHFS_INODE_BLK(ino), offset,
247 squashfs_i(inode)->start,
248 le16_to_cpu(sqsh_ino->offset));
249 break;
250 }
251 case SQUASHFS_LDIR_TYPE: {
252 struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;
253
254 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
255 sizeof(*sqsh_ino));
256 if (err < 0)
257 goto failed_read;
258
259 xattr_id = le32_to_cpu(sqsh_ino->xattr);
260 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
261 inode->i_size = le32_to_cpu(sqsh_ino->file_size);
262 inode->i_op = &squashfs_dir_inode_ops;
263 inode->i_fop = &squashfs_dir_ops;
264 inode->i_mode |= S_IFDIR;
265 squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
266 squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
267 squashfs_i(inode)->dir_idx_start = block;
268 squashfs_i(inode)->dir_idx_offset = offset;
269 squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
270 squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
271
272 TRACE("Long directory inode %x:%x, start_block %llx, offset "
273 "%x\n", SQUASHFS_INODE_BLK(ino), offset,
274 squashfs_i(inode)->start,
275 le16_to_cpu(sqsh_ino->offset));
276 break;
277 }
278 case SQUASHFS_SYMLINK_TYPE:
279 case SQUASHFS_LSYMLINK_TYPE: {
280 struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;
281
282 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
283 sizeof(*sqsh_ino));
284 if (err < 0)
285 goto failed_read;
286
287 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
288 inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
289 inode->i_op = &squashfs_symlink_inode_ops;
290 inode->i_data.a_ops = &squashfs_symlink_aops;
291 inode->i_mode |= S_IFLNK;
292 squashfs_i(inode)->start = block;
293 squashfs_i(inode)->offset = offset;
294
295 if (type == SQUASHFS_LSYMLINK_TYPE) {
296 __le32 xattr;
297
298 err = squashfs_read_metadata(sb, NULL, &block,
299 &offset, inode->i_size);
300 if (err < 0)
301 goto failed_read;
302 err = squashfs_read_metadata(sb, &xattr, &block,
303 &offset, sizeof(xattr));
304 if (err < 0)
305 goto failed_read;
306 xattr_id = le32_to_cpu(xattr);
307 }
308
309 TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
310 "%x\n", SQUASHFS_INODE_BLK(ino), offset,
311 block, offset);
312 break;
313 }
314 case SQUASHFS_BLKDEV_TYPE:
315 case SQUASHFS_CHRDEV_TYPE: {
316 struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
317 unsigned int rdev;
318
319 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
320 sizeof(*sqsh_ino));
321 if (err < 0)
322 goto failed_read;
323
324 if (type == SQUASHFS_CHRDEV_TYPE)
325 inode->i_mode |= S_IFCHR;
326 else
327 inode->i_mode |= S_IFBLK;
328 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
329 rdev = le32_to_cpu(sqsh_ino->rdev);
330 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
331
332 TRACE("Device inode %x:%x, rdev %x\n",
333 SQUASHFS_INODE_BLK(ino), offset, rdev);
334 break;
335 }
336 case SQUASHFS_LBLKDEV_TYPE:
337 case SQUASHFS_LCHRDEV_TYPE: {
338 struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
339 unsigned int rdev;
340
341 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
342 sizeof(*sqsh_ino));
343 if (err < 0)
344 goto failed_read;
345
346 if (type == SQUASHFS_LCHRDEV_TYPE)
347 inode->i_mode |= S_IFCHR;
348 else
349 inode->i_mode |= S_IFBLK;
350 xattr_id = le32_to_cpu(sqsh_ino->xattr);
351 inode->i_op = &squashfs_inode_ops;
352 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
353 rdev = le32_to_cpu(sqsh_ino->rdev);
354 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
355
356 TRACE("Device inode %x:%x, rdev %x\n",
357 SQUASHFS_INODE_BLK(ino), offset, rdev);
358 break;
359 }
360 case SQUASHFS_FIFO_TYPE:
361 case SQUASHFS_SOCKET_TYPE: {
362 struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;
363
364 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
365 sizeof(*sqsh_ino));
366 if (err < 0)
367 goto failed_read;
368
369 if (type == SQUASHFS_FIFO_TYPE)
370 inode->i_mode |= S_IFIFO;
371 else
372 inode->i_mode |= S_IFSOCK;
373 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
374 init_special_inode(inode, inode->i_mode, 0);
375 break;
376 }
377 case SQUASHFS_LFIFO_TYPE:
378 case SQUASHFS_LSOCKET_TYPE: {
379 struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;
380
381 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
382 sizeof(*sqsh_ino));
383 if (err < 0)
384 goto failed_read;
385
386 if (type == SQUASHFS_LFIFO_TYPE)
387 inode->i_mode |= S_IFIFO;
388 else
389 inode->i_mode |= S_IFSOCK;
390 xattr_id = le32_to_cpu(sqsh_ino->xattr);
391 inode->i_op = &squashfs_inode_ops;
392 inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
393 init_special_inode(inode, inode->i_mode, 0);
394 break;
395 }
396 default:
397 ERROR("Unknown inode type %d in squashfs_iget!\n", type);
398 return -EINVAL;
399 }
400
401 if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
402 err = squashfs_xattr_lookup(sb, xattr_id,
403 &squashfs_i(inode)->xattr_count,
404 &squashfs_i(inode)->xattr_size,
405 &squashfs_i(inode)->xattr);
406 if (err < 0)
407 goto failed_read;
408 inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
409 + 1;
410 } else
411 squashfs_i(inode)->xattr_count = 0;
412
413 return 0;
414
415failed_read:
416 ERROR("Unable to read inode 0x%llx\n", ino);
417 return err;
418}
419
420
421const struct inode_operations squashfs_inode_ops = {
422 .getxattr = generic_getxattr,
423 .listxattr = squashfs_listxattr
424};
425
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Squashfs - a compressed read only filesystem for Linux
4 *
5 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
6 * Phillip Lougher <phillip@squashfs.org.uk>
7 *
8 * inode.c
9 */
10
11/*
12 * This file implements code to create and read inodes from disk.
13 *
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>).
17 *
18 * To maximise compression there are different inodes for each file type
19 * (regular file, directory, device, etc.), the inode contents and length
20 * varying with the type.
21 *
22 * To further maximise compression, two types of regular file inode and
23 * directory inode are defined: inodes optimised for frequently occurring
24 * regular files and directories, and extended types where extra
25 * information has to be stored.
26 */
27
28#include <linux/fs.h>
29#include <linux/vfs.h>
30#include <linux/xattr.h>
31#include <linux/pagemap.h>
32
33#include "squashfs_fs.h"
34#include "squashfs_fs_sb.h"
35#include "squashfs_fs_i.h"
36#include "squashfs.h"
37#include "xattr.h"
38
39/*
40 * Initialise VFS inode with the base inode information common to all
41 * Squashfs inode types. Sqsh_ino contains the unswapped base inode
42 * off disk.
43 */
44static int squashfs_new_inode(struct super_block *sb, struct inode *inode,
45 struct squashfs_base_inode *sqsh_ino)
46{
47 uid_t i_uid;
48 gid_t i_gid;
49 int err;
50
51 inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
52 if (inode->i_ino == 0)
53 return -EINVAL;
54
55 err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid);
56 if (err)
57 return err;
58
59 err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid);
60 if (err)
61 return err;
62
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;
70
71 return err;
72}
73
74
75struct inode *squashfs_iget(struct super_block *sb, long long ino,
76 unsigned int ino_number)
77{
78 struct inode *inode = iget_locked(sb, ino_number);
79 int err;
80
81 TRACE("Entered squashfs_iget\n");
82
83 if (!inode)
84 return ERR_PTR(-ENOMEM);
85 if (!(inode->i_state & I_NEW))
86 return inode;
87
88 err = squashfs_read_inode(inode, ino);
89 if (err) {
90 iget_failed(inode);
91 return ERR_PTR(err);
92 }
93
94 unlock_new_inode(inode);
95 return inode;
96}
97
98
99/*
100 * Initialise VFS inode by reading inode from inode table (compressed
101 * metadata). The format and amount of data read depends on type.
102 */
103int squashfs_read_inode(struct inode *inode, long long ino)
104{
105 struct super_block *sb = inode->i_sb;
106 struct squashfs_sb_info *msblk = sb->s_fs_info;
107 u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
108 int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
109 union squashfs_inode squashfs_ino;
110 struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
111 int xattr_id = SQUASHFS_INVALID_XATTR;
112
113 TRACE("Entered squashfs_read_inode\n");
114
115 /*
116 * Read inode base common to all inode types.
117 */
118 err = squashfs_read_metadata(sb, sqshb_ino, &block,
119 &offset, sizeof(*sqshb_ino));
120 if (err < 0)
121 goto failed_read;
122
123 err = squashfs_new_inode(sb, inode, sqshb_ino);
124 if (err)
125 goto failed_read;
126
127 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
128 offset = SQUASHFS_INODE_OFFSET(ino);
129
130 type = le16_to_cpu(sqshb_ino->inode_type);
131 switch (type) {
132 case SQUASHFS_REG_TYPE: {
133 unsigned int frag_offset, frag;
134 int frag_size;
135 u64 frag_blk;
136 struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
137
138 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
139 sizeof(*sqsh_ino));
140 if (err < 0)
141 goto failed_read;
142
143 frag = le32_to_cpu(sqsh_ino->fragment);
144 if (frag != SQUASHFS_INVALID_FRAG) {
145 frag_offset = le32_to_cpu(sqsh_ino->offset);
146 frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
147 if (frag_size < 0) {
148 err = frag_size;
149 goto failed_read;
150 }
151 } else {
152 frag_blk = SQUASHFS_INVALID_BLK;
153 frag_size = 0;
154 frag_offset = 0;
155 }
156
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;
169
170 TRACE("File inode %x:%x, start_block %llx, block_list_start "
171 "%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
172 offset, squashfs_i(inode)->start, block, offset);
173 break;
174 }
175 case SQUASHFS_LREG_TYPE: {
176 unsigned int frag_offset, frag;
177 int frag_size;
178 u64 frag_blk;
179 struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
180
181 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
182 sizeof(*sqsh_ino));
183 if (err < 0)
184 goto failed_read;
185
186 frag = le32_to_cpu(sqsh_ino->fragment);
187 if (frag != SQUASHFS_INVALID_FRAG) {
188 frag_offset = le32_to_cpu(sqsh_ino->offset);
189 frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
190 if (frag_size < 0) {
191 err = frag_size;
192 goto failed_read;
193 }
194 } else {
195 frag_blk = SQUASHFS_INVALID_BLK;
196 frag_size = 0;
197 frag_offset = 0;
198 }
199
200 xattr_id = le32_to_cpu(sqsh_ino->xattr);
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 -
207 le64_to_cpu(sqsh_ino->sparse) + 511) >> 9;
208
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;
216
217 TRACE("File inode %x:%x, start_block %llx, block_list_start "
218 "%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
219 offset, squashfs_i(inode)->start, block, offset);
220 break;
221 }
222 case SQUASHFS_DIR_TYPE: {
223 struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;
224
225 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
226 sizeof(*sqsh_ino));
227 if (err < 0)
228 goto failed_read;
229
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);
239
240 TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
241 SQUASHFS_INODE_BLK(ino), offset,
242 squashfs_i(inode)->start,
243 le16_to_cpu(sqsh_ino->offset));
244 break;
245 }
246 case SQUASHFS_LDIR_TYPE: {
247 struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;
248
249 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
250 sizeof(*sqsh_ino));
251 if (err < 0)
252 goto failed_read;
253
254 xattr_id = le32_to_cpu(sqsh_ino->xattr);
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);
266
267 TRACE("Long directory inode %x:%x, start_block %llx, offset "
268 "%x\n", SQUASHFS_INODE_BLK(ino), offset,
269 squashfs_i(inode)->start,
270 le16_to_cpu(sqsh_ino->offset));
271 break;
272 }
273 case SQUASHFS_SYMLINK_TYPE:
274 case SQUASHFS_LSYMLINK_TYPE: {
275 struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;
276
277 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
278 sizeof(*sqsh_ino));
279 if (err < 0)
280 goto failed_read;
281
282 inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
283 if (inode->i_size > PAGE_SIZE) {
284 ERROR("Corrupted symlink\n");
285 return -EINVAL;
286 }
287
288 set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
289 inode->i_op = &squashfs_symlink_inode_ops;
290 inode_nohighmem(inode);
291 inode->i_data.a_ops = &squashfs_symlink_aops;
292 inode->i_mode |= S_IFLNK;
293 squashfs_i(inode)->start = block;
294 squashfs_i(inode)->offset = offset;
295
296 if (type == SQUASHFS_LSYMLINK_TYPE) {
297 __le32 xattr;
298
299 err = squashfs_read_metadata(sb, NULL, &block,
300 &offset, inode->i_size);
301 if (err < 0)
302 goto failed_read;
303 err = squashfs_read_metadata(sb, &xattr, &block,
304 &offset, sizeof(xattr));
305 if (err < 0)
306 goto failed_read;
307 xattr_id = le32_to_cpu(xattr);
308 }
309
310 TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
311 "%x\n", SQUASHFS_INODE_BLK(ino), offset,
312 block, offset);
313 break;
314 }
315 case SQUASHFS_BLKDEV_TYPE:
316 case SQUASHFS_CHRDEV_TYPE: {
317 struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
318 unsigned int rdev;
319
320 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
321 sizeof(*sqsh_ino));
322 if (err < 0)
323 goto failed_read;
324
325 if (type == SQUASHFS_CHRDEV_TYPE)
326 inode->i_mode |= S_IFCHR;
327 else
328 inode->i_mode |= S_IFBLK;
329 set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
330 rdev = le32_to_cpu(sqsh_ino->rdev);
331 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
332
333 TRACE("Device inode %x:%x, rdev %x\n",
334 SQUASHFS_INODE_BLK(ino), offset, rdev);
335 break;
336 }
337 case SQUASHFS_LBLKDEV_TYPE:
338 case SQUASHFS_LCHRDEV_TYPE: {
339 struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
340 unsigned int rdev;
341
342 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
343 sizeof(*sqsh_ino));
344 if (err < 0)
345 goto failed_read;
346
347 if (type == SQUASHFS_LCHRDEV_TYPE)
348 inode->i_mode |= S_IFCHR;
349 else
350 inode->i_mode |= S_IFBLK;
351 xattr_id = le32_to_cpu(sqsh_ino->xattr);
352 inode->i_op = &squashfs_inode_ops;
353 set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
354 rdev = le32_to_cpu(sqsh_ino->rdev);
355 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
356
357 TRACE("Device inode %x:%x, rdev %x\n",
358 SQUASHFS_INODE_BLK(ino), offset, rdev);
359 break;
360 }
361 case SQUASHFS_FIFO_TYPE:
362 case SQUASHFS_SOCKET_TYPE: {
363 struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;
364
365 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
366 sizeof(*sqsh_ino));
367 if (err < 0)
368 goto failed_read;
369
370 if (type == SQUASHFS_FIFO_TYPE)
371 inode->i_mode |= S_IFIFO;
372 else
373 inode->i_mode |= S_IFSOCK;
374 set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
375 init_special_inode(inode, inode->i_mode, 0);
376 break;
377 }
378 case SQUASHFS_LFIFO_TYPE:
379 case SQUASHFS_LSOCKET_TYPE: {
380 struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;
381
382 err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
383 sizeof(*sqsh_ino));
384 if (err < 0)
385 goto failed_read;
386
387 if (type == SQUASHFS_LFIFO_TYPE)
388 inode->i_mode |= S_IFIFO;
389 else
390 inode->i_mode |= S_IFSOCK;
391 xattr_id = le32_to_cpu(sqsh_ino->xattr);
392 inode->i_op = &squashfs_inode_ops;
393 set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
394 init_special_inode(inode, inode->i_mode, 0);
395 break;
396 }
397 default:
398 ERROR("Unknown inode type %d in squashfs_iget!\n", type);
399 return -EINVAL;
400 }
401
402 if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
403 err = squashfs_xattr_lookup(sb, xattr_id,
404 &squashfs_i(inode)->xattr_count,
405 &squashfs_i(inode)->xattr_size,
406 &squashfs_i(inode)->xattr);
407 if (err < 0)
408 goto failed_read;
409 inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
410 + 1;
411 } else
412 squashfs_i(inode)->xattr_count = 0;
413
414 return 0;
415
416failed_read:
417 ERROR("Unable to read inode 0x%llx\n", ino);
418 return err;
419}
420
421
422const struct inode_operations squashfs_inode_ops = {
423 .listxattr = squashfs_listxattr
424};
425