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6
7#include "xattr.h"
8
9#include <trace/events/erofs.h>
10
11
12static int erofs_read_inode(struct inode *inode, void *data)
13{
14 struct erofs_inode *vi = EROFS_I(inode);
15 struct erofs_inode_compact *dic = data;
16 struct erofs_inode_extended *die;
17
18 const unsigned int ifmt = le16_to_cpu(dic->i_format);
19 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
20 erofs_blk_t nblks = 0;
21
22 vi->datalayout = erofs_inode_datalayout(ifmt);
23
24 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
25 erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
26 vi->datalayout, vi->nid);
27 DBG_BUGON(1);
28 return -EOPNOTSUPP;
29 }
30
31 switch (erofs_inode_version(ifmt)) {
32 case EROFS_INODE_LAYOUT_EXTENDED:
33 die = data;
34
35 vi->inode_isize = sizeof(struct erofs_inode_extended);
36 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
37
38 inode->i_mode = le16_to_cpu(die->i_mode);
39 switch (inode->i_mode & S_IFMT) {
40 case S_IFREG:
41 case S_IFDIR:
42 case S_IFLNK:
43 vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr);
44 break;
45 case S_IFCHR:
46 case S_IFBLK:
47 inode->i_rdev =
48 new_decode_dev(le32_to_cpu(die->i_u.rdev));
49 break;
50 case S_IFIFO:
51 case S_IFSOCK:
52 inode->i_rdev = 0;
53 break;
54 default:
55 goto bogusimode;
56 }
57 i_uid_write(inode, le32_to_cpu(die->i_uid));
58 i_gid_write(inode, le32_to_cpu(die->i_gid));
59 set_nlink(inode, le32_to_cpu(die->i_nlink));
60
61
62 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
63 le64_to_cpu(die->i_ctime);
64 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
65 le32_to_cpu(die->i_ctime_nsec);
66
67 inode->i_size = le64_to_cpu(die->i_size);
68
69
70 if (erofs_inode_is_data_compressed(vi->datalayout))
71 nblks = le32_to_cpu(die->i_u.compressed_blocks);
72 break;
73 case EROFS_INODE_LAYOUT_COMPACT:
74 vi->inode_isize = sizeof(struct erofs_inode_compact);
75 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
76
77 inode->i_mode = le16_to_cpu(dic->i_mode);
78 switch (inode->i_mode & S_IFMT) {
79 case S_IFREG:
80 case S_IFDIR:
81 case S_IFLNK:
82 vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr);
83 break;
84 case S_IFCHR:
85 case S_IFBLK:
86 inode->i_rdev =
87 new_decode_dev(le32_to_cpu(dic->i_u.rdev));
88 break;
89 case S_IFIFO:
90 case S_IFSOCK:
91 inode->i_rdev = 0;
92 break;
93 default:
94 goto bogusimode;
95 }
96 i_uid_write(inode, le16_to_cpu(dic->i_uid));
97 i_gid_write(inode, le16_to_cpu(dic->i_gid));
98 set_nlink(inode, le16_to_cpu(dic->i_nlink));
99
100
101 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
102 sbi->build_time;
103 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
104 sbi->build_time_nsec;
105
106 inode->i_size = le32_to_cpu(dic->i_size);
107 if (erofs_inode_is_data_compressed(vi->datalayout))
108 nblks = le32_to_cpu(dic->i_u.compressed_blocks);
109 break;
110 default:
111 erofs_err(inode->i_sb,
112 "unsupported on-disk inode version %u of nid %llu",
113 erofs_inode_version(ifmt), vi->nid);
114 DBG_BUGON(1);
115 return -EOPNOTSUPP;
116 }
117
118 if (!nblks)
119
120 inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
121 else
122 inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
123 return 0;
124
125bogusimode:
126 erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu",
127 inode->i_mode, vi->nid);
128 DBG_BUGON(1);
129 return -EFSCORRUPTED;
130}
131
132static int erofs_fill_symlink(struct inode *inode, void *data,
133 unsigned int m_pofs)
134{
135 struct erofs_inode *vi = EROFS_I(inode);
136 char *lnk;
137
138
139 if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
140 inode->i_size >= PAGE_SIZE) {
141 inode->i_op = &erofs_symlink_iops;
142 return 0;
143 }
144
145 lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
146 if (!lnk)
147 return -ENOMEM;
148
149 m_pofs += vi->inode_isize + vi->xattr_isize;
150
151 if (m_pofs + inode->i_size > PAGE_SIZE) {
152 kfree(lnk);
153 erofs_err(inode->i_sb,
154 "inline data cross block boundary @ nid %llu",
155 vi->nid);
156 DBG_BUGON(1);
157 return -EFSCORRUPTED;
158 }
159
160 memcpy(lnk, data + m_pofs, inode->i_size);
161 lnk[inode->i_size] = '\0';
162
163 inode->i_link = lnk;
164 inode->i_op = &erofs_fast_symlink_iops;
165 return 0;
166}
167
168static int erofs_fill_inode(struct inode *inode, int isdir)
169{
170 struct super_block *sb = inode->i_sb;
171 struct erofs_inode *vi = EROFS_I(inode);
172 struct page *page;
173 void *data;
174 int err;
175 erofs_blk_t blkaddr;
176 unsigned int ofs;
177 erofs_off_t inode_loc;
178
179 trace_erofs_fill_inode(inode, isdir);
180 inode_loc = iloc(EROFS_SB(sb), vi->nid);
181 blkaddr = erofs_blknr(inode_loc);
182 ofs = erofs_blkoff(inode_loc);
183
184 erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u",
185 __func__, vi->nid, ofs, blkaddr);
186
187 page = erofs_get_meta_page(sb, blkaddr);
188
189 if (IS_ERR(page)) {
190 erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
191 vi->nid, PTR_ERR(page));
192 return PTR_ERR(page);
193 }
194
195 DBG_BUGON(!PageUptodate(page));
196 data = page_address(page);
197
198 err = erofs_read_inode(inode, data + ofs);
199 if (err)
200 goto out_unlock;
201
202
203 switch (inode->i_mode & S_IFMT) {
204 case S_IFREG:
205 inode->i_op = &erofs_generic_iops;
206 inode->i_fop = &generic_ro_fops;
207 break;
208 case S_IFDIR:
209 inode->i_op = &erofs_dir_iops;
210 inode->i_fop = &erofs_dir_fops;
211 break;
212 case S_IFLNK:
213 err = erofs_fill_symlink(inode, data, ofs);
214 if (err)
215 goto out_unlock;
216 inode_nohighmem(inode);
217 break;
218 case S_IFCHR:
219 case S_IFBLK:
220 case S_IFIFO:
221 case S_IFSOCK:
222 inode->i_op = &erofs_generic_iops;
223 init_special_inode(inode, inode->i_mode, inode->i_rdev);
224 goto out_unlock;
225 default:
226 err = -EFSCORRUPTED;
227 goto out_unlock;
228 }
229
230 if (erofs_inode_is_data_compressed(vi->datalayout)) {
231 err = z_erofs_fill_inode(inode);
232 goto out_unlock;
233 }
234 inode->i_mapping->a_ops = &erofs_raw_access_aops;
235
236out_unlock:
237 unlock_page(page);
238 put_page(page);
239 return err;
240}
241
242
243
244
245
246static int erofs_ilookup_test_actor(struct inode *inode, void *opaque)
247{
248 const erofs_nid_t nid = *(erofs_nid_t *)opaque;
249
250 return EROFS_I(inode)->nid == nid;
251}
252
253static int erofs_iget_set_actor(struct inode *inode, void *opaque)
254{
255 const erofs_nid_t nid = *(erofs_nid_t *)opaque;
256
257 inode->i_ino = erofs_inode_hash(nid);
258 return 0;
259}
260
261static inline struct inode *erofs_iget_locked(struct super_block *sb,
262 erofs_nid_t nid)
263{
264 const unsigned long hashval = erofs_inode_hash(nid);
265
266 return iget5_locked(sb, hashval, erofs_ilookup_test_actor,
267 erofs_iget_set_actor, &nid);
268}
269
270struct inode *erofs_iget(struct super_block *sb,
271 erofs_nid_t nid,
272 bool isdir)
273{
274 struct inode *inode = erofs_iget_locked(sb, nid);
275
276 if (!inode)
277 return ERR_PTR(-ENOMEM);
278
279 if (inode->i_state & I_NEW) {
280 int err;
281 struct erofs_inode *vi = EROFS_I(inode);
282
283 vi->nid = nid;
284
285 err = erofs_fill_inode(inode, isdir);
286 if (!err)
287 unlock_new_inode(inode);
288 else {
289 iget_failed(inode);
290 inode = ERR_PTR(err);
291 }
292 }
293 return inode;
294}
295
296int erofs_getattr(const struct path *path, struct kstat *stat,
297 u32 request_mask, unsigned int query_flags)
298{
299 struct inode *const inode = d_inode(path->dentry);
300
301 if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
302 stat->attributes |= STATX_ATTR_COMPRESSED;
303
304 stat->attributes |= STATX_ATTR_IMMUTABLE;
305 stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
306 STATX_ATTR_IMMUTABLE);
307
308 generic_fillattr(inode, stat);
309 return 0;
310}
311
312const struct inode_operations erofs_generic_iops = {
313 .getattr = erofs_getattr,
314#ifdef CONFIG_EROFS_FS_XATTR
315 .listxattr = erofs_listxattr,
316#endif
317 .get_acl = erofs_get_acl,
318};
319
320const struct inode_operations erofs_symlink_iops = {
321 .get_link = page_get_link,
322 .getattr = erofs_getattr,
323#ifdef CONFIG_EROFS_FS_XATTR
324 .listxattr = erofs_listxattr,
325#endif
326 .get_acl = erofs_get_acl,
327};
328
329const struct inode_operations erofs_fast_symlink_iops = {
330 .get_link = simple_get_link,
331 .getattr = erofs_getattr,
332#ifdef CONFIG_EROFS_FS_XATTR
333 .listxattr = erofs_listxattr,
334#endif
335 .get_acl = erofs_get_acl,
336};
337
338
