1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017-2018 HUAWEI, Inc.
4 * https://www.huawei.com/
5 * Copyright (C) 2021, Alibaba Cloud
6 */
7 #include "xattr.h"
8
9 #include <trace/events/erofs.h>
10
erofs_read_inode(struct erofs_buf * buf,struct inode * inode,unsigned int * ofs)11 static void *erofs_read_inode(struct erofs_buf *buf,
12 struct inode *inode, unsigned int *ofs)
13 {
14 struct super_block *sb = inode->i_sb;
15 struct erofs_sb_info *sbi = EROFS_SB(sb);
16 struct erofs_inode *vi = EROFS_I(inode);
17 const erofs_off_t inode_loc = erofs_iloc(inode);
18
19 erofs_blk_t blkaddr, nblks = 0;
20 void *kaddr;
21 struct erofs_inode_compact *dic;
22 struct erofs_inode_extended *die, *copied = NULL;
23 unsigned int ifmt;
24 int err;
25
26 blkaddr = erofs_blknr(sb, inode_loc);
27 *ofs = erofs_blkoff(sb, inode_loc);
28
29 kaddr = erofs_read_metabuf(buf, sb, blkaddr, EROFS_KMAP);
30 if (IS_ERR(kaddr)) {
31 erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
32 vi->nid, PTR_ERR(kaddr));
33 return kaddr;
34 }
35
36 dic = kaddr + *ofs;
37 ifmt = le16_to_cpu(dic->i_format);
38
39 if (ifmt & ~EROFS_I_ALL) {
40 erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu",
41 ifmt, vi->nid);
42 err = -EOPNOTSUPP;
43 goto err_out;
44 }
45
46 vi->datalayout = erofs_inode_datalayout(ifmt);
47 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
48 erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
49 vi->datalayout, vi->nid);
50 err = -EOPNOTSUPP;
51 goto err_out;
52 }
53
54 switch (erofs_inode_version(ifmt)) {
55 case EROFS_INODE_LAYOUT_EXTENDED:
56 vi->inode_isize = sizeof(struct erofs_inode_extended);
57 /* check if the extended inode acrosses block boundary */
58 if (*ofs + vi->inode_isize <= sb->s_blocksize) {
59 *ofs += vi->inode_isize;
60 die = (struct erofs_inode_extended *)dic;
61 } else {
62 const unsigned int gotten = sb->s_blocksize - *ofs;
63
64 copied = kmalloc(vi->inode_isize, GFP_NOFS);
65 if (!copied) {
66 err = -ENOMEM;
67 goto err_out;
68 }
69 memcpy(copied, dic, gotten);
70 kaddr = erofs_read_metabuf(buf, sb, blkaddr + 1,
71 EROFS_KMAP);
72 if (IS_ERR(kaddr)) {
73 erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld",
74 vi->nid, PTR_ERR(kaddr));
75 kfree(copied);
76 return kaddr;
77 }
78 *ofs = vi->inode_isize - gotten;
79 memcpy((u8 *)copied + gotten, kaddr, *ofs);
80 die = copied;
81 }
82 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
83
84 inode->i_mode = le16_to_cpu(die->i_mode);
85 switch (inode->i_mode & S_IFMT) {
86 case S_IFREG:
87 case S_IFDIR:
88 case S_IFLNK:
89 vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr);
90 break;
91 case S_IFCHR:
92 case S_IFBLK:
93 inode->i_rdev =
94 new_decode_dev(le32_to_cpu(die->i_u.rdev));
95 break;
96 case S_IFIFO:
97 case S_IFSOCK:
98 inode->i_rdev = 0;
99 break;
100 default:
101 goto bogusimode;
102 }
103 i_uid_write(inode, le32_to_cpu(die->i_uid));
104 i_gid_write(inode, le32_to_cpu(die->i_gid));
105 set_nlink(inode, le32_to_cpu(die->i_nlink));
106
107 /* extended inode has its own timestamp */
108 inode_set_ctime(inode, le64_to_cpu(die->i_mtime),
109 le32_to_cpu(die->i_mtime_nsec));
110
111 inode->i_size = le64_to_cpu(die->i_size);
112
113 /* total blocks for compressed files */
114 if (erofs_inode_is_data_compressed(vi->datalayout))
115 nblks = le32_to_cpu(die->i_u.compressed_blocks);
116 else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
117 /* fill chunked inode summary info */
118 vi->chunkformat = le16_to_cpu(die->i_u.c.format);
119 kfree(copied);
120 copied = NULL;
121 break;
122 case EROFS_INODE_LAYOUT_COMPACT:
123 vi->inode_isize = sizeof(struct erofs_inode_compact);
124 *ofs += vi->inode_isize;
125 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
126
127 inode->i_mode = le16_to_cpu(dic->i_mode);
128 switch (inode->i_mode & S_IFMT) {
129 case S_IFREG:
130 case S_IFDIR:
131 case S_IFLNK:
132 vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr);
133 break;
134 case S_IFCHR:
135 case S_IFBLK:
136 inode->i_rdev =
137 new_decode_dev(le32_to_cpu(dic->i_u.rdev));
138 break;
139 case S_IFIFO:
140 case S_IFSOCK:
141 inode->i_rdev = 0;
142 break;
143 default:
144 goto bogusimode;
145 }
146 i_uid_write(inode, le16_to_cpu(dic->i_uid));
147 i_gid_write(inode, le16_to_cpu(dic->i_gid));
148 set_nlink(inode, le16_to_cpu(dic->i_nlink));
149
150 /* use build time for compact inodes */
151 inode_set_ctime(inode, sbi->build_time, sbi->build_time_nsec);
152
153 inode->i_size = le32_to_cpu(dic->i_size);
154 if (erofs_inode_is_data_compressed(vi->datalayout))
155 nblks = le32_to_cpu(dic->i_u.compressed_blocks);
156 else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
157 vi->chunkformat = le16_to_cpu(dic->i_u.c.format);
158 break;
159 default:
160 erofs_err(inode->i_sb,
161 "unsupported on-disk inode version %u of nid %llu",
162 erofs_inode_version(ifmt), vi->nid);
163 err = -EOPNOTSUPP;
164 goto err_out;
165 }
166
167 if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
168 if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {
169 erofs_err(inode->i_sb,
170 "unsupported chunk format %x of nid %llu",
171 vi->chunkformat, vi->nid);
172 err = -EOPNOTSUPP;
173 goto err_out;
174 }
175 vi->chunkbits = sb->s_blocksize_bits +
176 (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
177 }
178 inode->i_mtime = inode->i_atime = inode_get_ctime(inode);
179
180 inode->i_flags &= ~S_DAX;
181 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
182 (vi->datalayout == EROFS_INODE_FLAT_PLAIN ||
183 vi->datalayout == EROFS_INODE_CHUNK_BASED))
184 inode->i_flags |= S_DAX;
185
186 if (!nblks)
187 /* measure inode.i_blocks as generic filesystems */
188 inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9;
189 else
190 inode->i_blocks = nblks << (sb->s_blocksize_bits - 9);
191 return kaddr;
192
193 bogusimode:
194 erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu",
195 inode->i_mode, vi->nid);
196 err = -EFSCORRUPTED;
197 err_out:
198 DBG_BUGON(1);
199 kfree(copied);
200 erofs_put_metabuf(buf);
201 return ERR_PTR(err);
202 }
203
erofs_fill_symlink(struct inode * inode,void * kaddr,unsigned int m_pofs)204 static int erofs_fill_symlink(struct inode *inode, void *kaddr,
205 unsigned int m_pofs)
206 {
207 struct erofs_inode *vi = EROFS_I(inode);
208 unsigned int bsz = i_blocksize(inode);
209 char *lnk;
210
211 /* if it cannot be handled with fast symlink scheme */
212 if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
213 inode->i_size >= bsz || inode->i_size < 0) {
214 inode->i_op = &erofs_symlink_iops;
215 return 0;
216 }
217
218 lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
219 if (!lnk)
220 return -ENOMEM;
221
222 m_pofs += vi->xattr_isize;
223 /* inline symlink data shouldn't cross block boundary */
224 if (m_pofs + inode->i_size > bsz) {
225 kfree(lnk);
226 erofs_err(inode->i_sb,
227 "inline data cross block boundary @ nid %llu",
228 vi->nid);
229 DBG_BUGON(1);
230 return -EFSCORRUPTED;
231 }
232 memcpy(lnk, kaddr + m_pofs, inode->i_size);
233 lnk[inode->i_size] = '\0';
234
235 inode->i_link = lnk;
236 inode->i_op = &erofs_fast_symlink_iops;
237 return 0;
238 }
239
erofs_fill_inode(struct inode * inode)240 static int erofs_fill_inode(struct inode *inode)
241 {
242 struct erofs_inode *vi = EROFS_I(inode);
243 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
244 void *kaddr;
245 unsigned int ofs;
246 int err = 0;
247
248 trace_erofs_fill_inode(inode);
249
250 /* read inode base data from disk */
251 kaddr = erofs_read_inode(&buf, inode, &ofs);
252 if (IS_ERR(kaddr))
253 return PTR_ERR(kaddr);
254
255 /* setup the new inode */
256 switch (inode->i_mode & S_IFMT) {
257 case S_IFREG:
258 inode->i_op = &erofs_generic_iops;
259 if (erofs_inode_is_data_compressed(vi->datalayout))
260 inode->i_fop = &generic_ro_fops;
261 else
262 inode->i_fop = &erofs_file_fops;
263 break;
264 case S_IFDIR:
265 inode->i_op = &erofs_dir_iops;
266 inode->i_fop = &erofs_dir_fops;
267 inode_nohighmem(inode);
268 break;
269 case S_IFLNK:
270 err = erofs_fill_symlink(inode, kaddr, ofs);
271 if (err)
272 goto out_unlock;
273 inode_nohighmem(inode);
274 break;
275 case S_IFCHR:
276 case S_IFBLK:
277 case S_IFIFO:
278 case S_IFSOCK:
279 inode->i_op = &erofs_generic_iops;
280 init_special_inode(inode, inode->i_mode, inode->i_rdev);
281 goto out_unlock;
282 default:
283 err = -EFSCORRUPTED;
284 goto out_unlock;
285 }
286
287 if (erofs_inode_is_data_compressed(vi->datalayout)) {
288 #ifdef CONFIG_EROFS_FS_ZIP
289 if (!erofs_is_fscache_mode(inode->i_sb) &&
290 inode->i_sb->s_blocksize_bits == PAGE_SHIFT) {
291 inode->i_mapping->a_ops = &z_erofs_aops;
292 err = 0;
293 goto out_unlock;
294 }
295 #endif
296 err = -EOPNOTSUPP;
297 goto out_unlock;
298 }
299 inode->i_mapping->a_ops = &erofs_raw_access_aops;
300 mapping_set_large_folios(inode->i_mapping);
301 #ifdef CONFIG_EROFS_FS_ONDEMAND
302 if (erofs_is_fscache_mode(inode->i_sb))
303 inode->i_mapping->a_ops = &erofs_fscache_access_aops;
304 #endif
305
306 out_unlock:
307 erofs_put_metabuf(&buf);
308 return err;
309 }
310
311 /*
312 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
313 * so that it will fit.
314 */
erofs_squash_ino(erofs_nid_t nid)315 static ino_t erofs_squash_ino(erofs_nid_t nid)
316 {
317 ino_t ino = (ino_t)nid;
318
319 if (sizeof(ino_t) < sizeof(erofs_nid_t))
320 ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8;
321 return ino;
322 }
323
erofs_iget5_eq(struct inode * inode,void * opaque)324 static int erofs_iget5_eq(struct inode *inode, void *opaque)
325 {
326 return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque;
327 }
328
erofs_iget5_set(struct inode * inode,void * opaque)329 static int erofs_iget5_set(struct inode *inode, void *opaque)
330 {
331 const erofs_nid_t nid = *(erofs_nid_t *)opaque;
332
333 inode->i_ino = erofs_squash_ino(nid);
334 EROFS_I(inode)->nid = nid;
335 return 0;
336 }
337
erofs_iget(struct super_block * sb,erofs_nid_t nid)338 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid)
339 {
340 struct inode *inode;
341
342 inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq,
343 erofs_iget5_set, &nid);
344 if (!inode)
345 return ERR_PTR(-ENOMEM);
346
347 if (inode->i_state & I_NEW) {
348 int err = erofs_fill_inode(inode);
349
350 if (err) {
351 iget_failed(inode);
352 return ERR_PTR(err);
353 }
354 unlock_new_inode(inode);
355 }
356 return inode;
357 }
358
erofs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)359 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
360 struct kstat *stat, u32 request_mask,
361 unsigned int query_flags)
362 {
363 struct inode *const inode = d_inode(path->dentry);
364
365 if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
366 stat->attributes |= STATX_ATTR_COMPRESSED;
367
368 stat->attributes |= STATX_ATTR_IMMUTABLE;
369 stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
370 STATX_ATTR_IMMUTABLE);
371
372 generic_fillattr(idmap, request_mask, inode, stat);
373 return 0;
374 }
375
376 const struct inode_operations erofs_generic_iops = {
377 .getattr = erofs_getattr,
378 .listxattr = erofs_listxattr,
379 .get_inode_acl = erofs_get_acl,
380 .fiemap = erofs_fiemap,
381 };
382
383 const struct inode_operations erofs_symlink_iops = {
384 .get_link = page_get_link,
385 .getattr = erofs_getattr,
386 .listxattr = erofs_listxattr,
387 .get_inode_acl = erofs_get_acl,
388 };
389
390 const struct inode_operations erofs_fast_symlink_iops = {
391 .get_link = simple_get_link,
392 .getattr = erofs_getattr,
393 .listxattr = erofs_listxattr,
394 .get_inode_acl = erofs_get_acl,
395 };
396
