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