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