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13#include "xattr.h"
14
15#include <trace/events/erofs.h>
16
17
18static int read_inode(struct inode *inode, void *data)
19{
20 struct erofs_vnode *vi = EROFS_V(inode);
21 struct erofs_inode_v1 *v1 = data;
22 const unsigned int advise = le16_to_cpu(v1->i_advise);
23 erofs_blk_t nblks = 0;
24
25 vi->datamode = __inode_data_mapping(advise);
26
27 if (unlikely(vi->datamode >= EROFS_INODE_LAYOUT_MAX)) {
28 errln("unsupported data mapping %u of nid %llu",
29 vi->datamode, vi->nid);
30 DBG_BUGON(1);
31 return -EIO;
32 }
33
34 if (__inode_version(advise) == EROFS_INODE_LAYOUT_V2) {
35 struct erofs_inode_v2 *v2 = data;
36
37 vi->inode_isize = sizeof(struct erofs_inode_v2);
38 vi->xattr_isize = ondisk_xattr_ibody_size(v2->i_xattr_icount);
39
40 inode->i_mode = le16_to_cpu(v2->i_mode);
41 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
42 S_ISLNK(inode->i_mode)) {
43 vi->raw_blkaddr = le32_to_cpu(v2->i_u.raw_blkaddr);
44 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
45 inode->i_rdev =
46 new_decode_dev(le32_to_cpu(v2->i_u.rdev));
47 } else if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
48 inode->i_rdev = 0;
49 } else {
50 return -EIO;
51 }
52
53 i_uid_write(inode, le32_to_cpu(v2->i_uid));
54 i_gid_write(inode, le32_to_cpu(v2->i_gid));
55 set_nlink(inode, le32_to_cpu(v2->i_nlink));
56
57
58 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
59 le64_to_cpu(v2->i_ctime);
60 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
61 le32_to_cpu(v2->i_ctime_nsec);
62
63 inode->i_size = le64_to_cpu(v2->i_size);
64
65
66 if (is_inode_layout_compression(inode))
67 nblks = le32_to_cpu(v2->i_u.compressed_blocks);
68 } else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
69 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
70
71 vi->inode_isize = sizeof(struct erofs_inode_v1);
72 vi->xattr_isize = ondisk_xattr_ibody_size(v1->i_xattr_icount);
73
74 inode->i_mode = le16_to_cpu(v1->i_mode);
75 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
76 S_ISLNK(inode->i_mode)) {
77 vi->raw_blkaddr = le32_to_cpu(v1->i_u.raw_blkaddr);
78 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
79 inode->i_rdev =
80 new_decode_dev(le32_to_cpu(v1->i_u.rdev));
81 } else if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
82 inode->i_rdev = 0;
83 } else {
84 return -EIO;
85 }
86
87 i_uid_write(inode, le16_to_cpu(v1->i_uid));
88 i_gid_write(inode, le16_to_cpu(v1->i_gid));
89 set_nlink(inode, le16_to_cpu(v1->i_nlink));
90
91
92 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
93 sbi->build_time;
94 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
95 sbi->build_time_nsec;
96
97 inode->i_size = le32_to_cpu(v1->i_size);
98 if (is_inode_layout_compression(inode))
99 nblks = le32_to_cpu(v1->i_u.compressed_blocks);
100 } else {
101 errln("unsupported on-disk inode version %u of nid %llu",
102 __inode_version(advise), vi->nid);
103 DBG_BUGON(1);
104 return -EIO;
105 }
106
107 if (!nblks)
108
109 inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
110 else
111 inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
112 return 0;
113}
114
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123
124
125static int fill_inline_data(struct inode *inode, void *data,
126 unsigned int m_pofs)
127{
128 struct erofs_vnode *vi = EROFS_V(inode);
129 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
130
131
132 if (!is_inode_flat_inline(inode))
133 return 0;
134
135
136 if (S_ISLNK(inode->i_mode) && inode->i_size < PAGE_SIZE) {
137 char *lnk = erofs_kmalloc(sbi, inode->i_size + 1, GFP_KERNEL);
138
139 if (unlikely(!lnk))
140 return -ENOMEM;
141
142 m_pofs += vi->inode_isize + vi->xattr_isize;
143
144
145 if (unlikely(m_pofs + inode->i_size > PAGE_SIZE)) {
146 DBG_BUGON(1);
147 kfree(lnk);
148 return -EIO;
149 }
150
151
152 memcpy(lnk, data + m_pofs, inode->i_size);
153 lnk[inode->i_size] = '\0';
154
155 inode->i_link = lnk;
156 set_inode_fast_symlink(inode);
157 }
158 return 0;
159}
160
161static int fill_inode(struct inode *inode, int isdir)
162{
163 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
164 struct erofs_vnode *vi = EROFS_V(inode);
165 struct page *page;
166 void *data;
167 int err;
168 erofs_blk_t blkaddr;
169 unsigned int ofs;
170
171 trace_erofs_fill_inode(inode, isdir);
172
173 blkaddr = erofs_blknr(iloc(sbi, vi->nid));
174 ofs = erofs_blkoff(iloc(sbi, vi->nid));
175
176 debugln("%s, reading inode nid %llu at %u of blkaddr %u",
177 __func__, vi->nid, ofs, blkaddr);
178
179 page = erofs_get_meta_page(inode->i_sb, blkaddr, isdir);
180
181 if (IS_ERR(page)) {
182 errln("failed to get inode (nid: %llu) page, err %ld",
183 vi->nid, PTR_ERR(page));
184 return PTR_ERR(page);
185 }
186
187 DBG_BUGON(!PageUptodate(page));
188 data = page_address(page);
189
190 err = read_inode(inode, data + ofs);
191 if (!err) {
192
193 if (S_ISREG(inode->i_mode)) {
194 inode->i_op = &erofs_generic_iops;
195 inode->i_fop = &generic_ro_fops;
196 } else if (S_ISDIR(inode->i_mode)) {
197 inode->i_op = &erofs_dir_iops;
198 inode->i_fop = &erofs_dir_fops;
199 } else if (S_ISLNK(inode->i_mode)) {
200
201 inode->i_op = &erofs_symlink_iops;
202 inode_nohighmem(inode);
203 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
204 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
205 inode->i_op = &erofs_generic_iops;
206 init_special_inode(inode, inode->i_mode, inode->i_rdev);
207 goto out_unlock;
208 } else {
209 err = -EIO;
210 goto out_unlock;
211 }
212
213 if (is_inode_layout_compression(inode)) {
214 err = z_erofs_fill_inode(inode);
215 goto out_unlock;
216 }
217
218 inode->i_mapping->a_ops = &erofs_raw_access_aops;
219
220
221 err = fill_inline_data(inode, data, ofs);
222 }
223
224out_unlock:
225 unlock_page(page);
226 put_page(page);
227 return err;
228}
229
230
231
232
233
234#if BITS_PER_LONG == 32
235static int erofs_ilookup_test_actor(struct inode *inode, void *opaque)
236{
237 const erofs_nid_t nid = *(erofs_nid_t *)opaque;
238
239 return EROFS_V(inode)->nid == nid;
240}
241
242static int erofs_iget_set_actor(struct inode *inode, void *opaque)
243{
244 const erofs_nid_t nid = *(erofs_nid_t *)opaque;
245
246 inode->i_ino = erofs_inode_hash(nid);
247 return 0;
248}
249#endif
250
251static inline struct inode *erofs_iget_locked(struct super_block *sb,
252 erofs_nid_t nid)
253{
254 const unsigned long hashval = erofs_inode_hash(nid);
255
256#if BITS_PER_LONG >= 64
257
258 return iget_locked(sb, hashval);
259#else
260 return iget5_locked(sb, hashval, erofs_ilookup_test_actor,
261 erofs_iget_set_actor, &nid);
262#endif
263}
264
265struct inode *erofs_iget(struct super_block *sb,
266 erofs_nid_t nid,
267 bool isdir)
268{
269 struct inode *inode = erofs_iget_locked(sb, nid);
270
271 if (unlikely(!inode))
272 return ERR_PTR(-ENOMEM);
273
274 if (inode->i_state & I_NEW) {
275 int err;
276 struct erofs_vnode *vi = EROFS_V(inode);
277
278 vi->nid = nid;
279
280 err = fill_inode(inode, isdir);
281 if (likely(!err))
282 unlock_new_inode(inode);
283 else {
284 iget_failed(inode);
285 inode = ERR_PTR(err);
286 }
287 }
288 return inode;
289}
290
291int erofs_getattr(const struct path *path, struct kstat *stat,
292 u32 request_mask, unsigned int query_flags)
293{
294 struct inode *const inode = d_inode(path->dentry);
295
296 if (is_inode_layout_compression(inode))
297 stat->attributes |= STATX_ATTR_COMPRESSED;
298
299 stat->attributes |= STATX_ATTR_IMMUTABLE;
300 stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
301 STATX_ATTR_IMMUTABLE);
302
303 generic_fillattr(inode, stat);
304 return 0;
305}
306
307const struct inode_operations erofs_generic_iops = {
308 .getattr = erofs_getattr,
309#ifdef CONFIG_EROFS_FS_XATTR
310 .listxattr = erofs_listxattr,
311#endif
312 .get_acl = erofs_get_acl,
313};
314
315const struct inode_operations erofs_symlink_iops = {
316 .get_link = page_get_link,
317 .getattr = erofs_getattr,
318#ifdef CONFIG_EROFS_FS_XATTR
319 .listxattr = erofs_listxattr,
320#endif
321 .get_acl = erofs_get_acl,
322};
323
324const struct inode_operations erofs_fast_symlink_iops = {
325 .get_link = simple_get_link,
326 .getattr = erofs_getattr,
327#ifdef CONFIG_EROFS_FS_XATTR
328 .listxattr = erofs_listxattr,
329#endif
330 .get_acl = erofs_get_acl,
331};
332
333
