1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/affs/inode.c
4 *
5 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 *
7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 *
9 * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.
10 *
11 * (C) 1991 Linus Torvalds - minix filesystem
12 */
13 #include <linux/sched.h>
14 #include <linux/cred.h>
15 #include <linux/gfp.h>
16 #include "affs.h"
17
affs_iget(struct super_block * sb,unsigned long ino)18 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
19 {
20 struct affs_sb_info *sbi = AFFS_SB(sb);
21 struct buffer_head *bh;
22 struct affs_tail *tail;
23 struct inode *inode;
24 u32 block;
25 u32 size;
26 u32 prot;
27 u16 id;
28
29 inode = iget_locked(sb, ino);
30 if (!inode)
31 return ERR_PTR(-ENOMEM);
32 if (!(inode_state_read_once(inode) & I_NEW))
33 return inode;
34
35 pr_debug("affs_iget(%llu)\n", inode->i_ino);
36
37 block = inode->i_ino;
38 bh = affs_bread(sb, block);
39 if (!bh) {
40 affs_warning(sb, "read_inode", "Cannot read block %d", block);
41 goto bad_inode;
42 }
43 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
44 affs_warning(sb,"read_inode",
45 "Checksum or type (ptype=%d) error on inode %d",
46 AFFS_HEAD(bh)->ptype, block);
47 goto bad_inode;
48 }
49
50 tail = AFFS_TAIL(sb, bh);
51 prot = be32_to_cpu(tail->protect);
52
53 inode->i_size = 0;
54 set_nlink(inode, 1);
55 inode->i_mode = 0;
56 AFFS_I(inode)->i_extcnt = 1;
57 AFFS_I(inode)->i_ext_last = ~1;
58 AFFS_I(inode)->i_protect = prot;
59 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
60 AFFS_I(inode)->i_blkcnt = 0;
61 AFFS_I(inode)->i_lc = NULL;
62 AFFS_I(inode)->i_lc_size = 0;
63 AFFS_I(inode)->i_lc_shift = 0;
64 AFFS_I(inode)->i_lc_mask = 0;
65 AFFS_I(inode)->i_ac = NULL;
66 AFFS_I(inode)->i_ext_bh = NULL;
67 AFFS_I(inode)->mmu_private = 0;
68 AFFS_I(inode)->i_lastalloc = 0;
69 AFFS_I(inode)->i_pa_cnt = 0;
70
71 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
72 inode->i_mode = sbi->s_mode;
73 else
74 inode->i_mode = affs_prot_to_mode(prot);
75
76 id = be16_to_cpu(tail->uid);
77 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))
78 inode->i_uid = sbi->s_uid;
79 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
80 i_uid_write(inode, 0);
81 else
82 i_uid_write(inode, id);
83
84 id = be16_to_cpu(tail->gid);
85 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))
86 inode->i_gid = sbi->s_gid;
87 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
88 i_gid_write(inode, 0);
89 else
90 i_gid_write(inode, id);
91
92 switch (be32_to_cpu(tail->stype)) {
93 case ST_ROOT:
94 inode->i_uid = sbi->s_uid;
95 inode->i_gid = sbi->s_gid;
96 fallthrough;
97 case ST_USERDIR:
98 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
99 affs_test_opt(sbi->s_flags, SF_SETMODE)) {
100 if (inode->i_mode & S_IRUSR)
101 inode->i_mode |= S_IXUSR;
102 if (inode->i_mode & S_IRGRP)
103 inode->i_mode |= S_IXGRP;
104 if (inode->i_mode & S_IROTH)
105 inode->i_mode |= S_IXOTH;
106 inode->i_mode |= S_IFDIR;
107 } else
108 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
109 /* Maybe it should be controlled by mount parameter? */
110 //inode->i_mode |= S_ISVTX;
111 inode->i_op = &affs_dir_inode_operations;
112 inode->i_fop = &affs_dir_operations;
113 break;
114 case ST_LINKDIR:
115 #if 0
116 affs_warning(sb, "read_inode", "inode is LINKDIR");
117 goto bad_inode;
118 #else
119 inode->i_mode |= S_IFDIR;
120 /* ... and leave ->i_op and ->i_fop pointing to empty */
121 break;
122 #endif
123 case ST_LINKFILE:
124 affs_warning(sb, "read_inode", "inode is LINKFILE");
125 goto bad_inode;
126 case ST_FILE:
127 size = be32_to_cpu(tail->size);
128 inode->i_mode |= S_IFREG;
129 AFFS_I(inode)->mmu_private = inode->i_size = size;
130 if (inode->i_size) {
131 AFFS_I(inode)->i_blkcnt = (size - 1) /
132 sbi->s_data_blksize + 1;
133 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
134 sbi->s_hashsize + 1;
135 }
136 if (tail->link_chain)
137 set_nlink(inode, 2);
138 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?
139 &affs_aops_ofs : &affs_aops;
140 inode->i_op = &affs_file_inode_operations;
141 inode->i_fop = &affs_file_operations;
142 break;
143 case ST_SOFTLINK:
144 inode->i_size = strlen((char *)AFFS_HEAD(bh)->table);
145 inode->i_mode |= S_IFLNK;
146 inode_nohighmem(inode);
147 inode->i_op = &affs_symlink_inode_operations;
148 inode->i_data.a_ops = &affs_symlink_aops;
149 break;
150 }
151
152 inode_set_mtime(inode,
153 inode_set_atime(inode, inode_set_ctime(inode, (be32_to_cpu(tail->change.days) * 86400LL + be32_to_cpu(tail->change.mins) * 60 + be32_to_cpu(tail->change.ticks) / 50 + AFFS_EPOCH_DELTA) + sys_tz.tz_minuteswest * 60, 0).tv_sec, 0).tv_sec,
154 0);
155 affs_brelse(bh);
156 unlock_new_inode(inode);
157 return inode;
158
159 bad_inode:
160 affs_brelse(bh);
161 iget_failed(inode);
162 return ERR_PTR(-EIO);
163 }
164
165 int
affs_write_inode(struct inode * inode,struct writeback_control * wbc)166 affs_write_inode(struct inode *inode, struct writeback_control *wbc)
167 {
168 struct super_block *sb = inode->i_sb;
169 struct buffer_head *bh;
170 struct affs_tail *tail;
171 uid_t uid;
172 gid_t gid;
173
174 pr_debug("write_inode(%llu)\n", inode->i_ino);
175
176 if (!inode->i_nlink)
177 // possibly free block
178 return 0;
179 bh = affs_bread(sb, inode->i_ino);
180 if (!bh) {
181 affs_error(sb, "write_inode", "Cannot read block %llu", inode->i_ino);
182 return -EIO;
183 }
184 tail = AFFS_TAIL(sb, bh);
185 if (tail->stype == cpu_to_be32(ST_ROOT)) {
186 affs_secs_to_datestamp(inode_get_mtime_sec(inode),
187 &AFFS_ROOT_TAIL(sb, bh)->root_change);
188 } else {
189 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
190 tail->size = cpu_to_be32(inode->i_size);
191 affs_secs_to_datestamp(inode_get_mtime_sec(inode),
192 &tail->change);
193 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
194 uid = i_uid_read(inode);
195 gid = i_gid_read(inode);
196 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
197 if (uid == 0 || uid == 0xFFFF)
198 uid = uid ^ ~0;
199 if (gid == 0 || gid == 0xFFFF)
200 gid = gid ^ ~0;
201 }
202 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
203 tail->uid = cpu_to_be16(uid);
204 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))
205 tail->gid = cpu_to_be16(gid);
206 }
207 }
208 affs_fix_checksum(sb, bh);
209 mmb_mark_buffer_dirty(bh, &AFFS_I(inode)->i_metadata_bhs);
210 affs_brelse(bh);
211 affs_free_prealloc(inode);
212 return 0;
213 }
214
215 int
affs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)216 affs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *attr)
217 {
218 struct inode *inode = d_inode(dentry);
219 int error;
220
221 pr_debug("setattr(%llu,0x%x)\n", inode->i_ino, attr->ia_valid);
222
223 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
224 if (error)
225 goto out;
226
227 if (((attr->ia_valid & ATTR_UID) &&
228 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
229 ((attr->ia_valid & ATTR_GID) &&
230 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
231 ((attr->ia_valid & ATTR_MODE) &&
232 (AFFS_SB(inode->i_sb)->s_flags &
233 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
234 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
235 error = -EPERM;
236 goto out;
237 }
238
239 if ((attr->ia_valid & ATTR_SIZE) &&
240 attr->ia_size != i_size_read(inode)) {
241 error = inode_newsize_ok(inode, attr->ia_size);
242 if (error)
243 return error;
244
245 truncate_setsize(inode, attr->ia_size);
246 affs_truncate(inode);
247 }
248
249 setattr_copy(&nop_mnt_idmap, inode, attr);
250 mark_inode_dirty(inode);
251
252 if (attr->ia_valid & ATTR_MODE)
253 affs_mode_to_prot(inode);
254 out:
255 return error;
256 }
257
258 void
affs_evict_inode(struct inode * inode)259 affs_evict_inode(struct inode *inode)
260 {
261 unsigned long cache_page;
262 pr_debug("evict_inode(ino=%llu, nlink=%u)\n",
263 inode->i_ino, inode->i_nlink);
264 truncate_inode_pages_final(&inode->i_data);
265
266 if (!inode->i_nlink) {
267 inode->i_size = 0;
268 affs_truncate(inode);
269 } else {
270 mmb_sync(&AFFS_I(inode)->i_metadata_bhs);
271 }
272
273 mmb_invalidate(&AFFS_I(inode)->i_metadata_bhs);
274 clear_inode(inode);
275 affs_free_prealloc(inode);
276 cache_page = (unsigned long)AFFS_I(inode)->i_lc;
277 if (cache_page) {
278 pr_debug("freeing ext cache\n");
279 AFFS_I(inode)->i_lc = NULL;
280 AFFS_I(inode)->i_ac = NULL;
281 free_page(cache_page);
282 }
283 affs_brelse(AFFS_I(inode)->i_ext_bh);
284 AFFS_I(inode)->i_ext_last = ~1;
285 AFFS_I(inode)->i_ext_bh = NULL;
286
287 if (!inode->i_nlink)
288 affs_free_block(inode->i_sb, inode->i_ino);
289 }
290
291 struct inode *
affs_new_inode(struct inode * dir)292 affs_new_inode(struct inode *dir)
293 {
294 struct super_block *sb = dir->i_sb;
295 struct inode *inode;
296 u32 block;
297 struct buffer_head *bh;
298
299 if (!(inode = new_inode(sb)))
300 goto err_inode;
301
302 if (!(block = affs_alloc_block(dir, dir->i_ino)))
303 goto err_block;
304
305 bh = affs_getzeroblk(sb, block);
306 if (!bh)
307 goto err_bh;
308 mmb_mark_buffer_dirty(bh, &AFFS_I(inode)->i_metadata_bhs);
309 affs_brelse(bh);
310
311 inode->i_uid = current_fsuid();
312 inode->i_gid = current_fsgid();
313 inode->i_ino = block;
314 set_nlink(inode, 1);
315 simple_inode_init_ts(inode);
316 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
317 AFFS_I(inode)->i_blkcnt = 0;
318 AFFS_I(inode)->i_lc = NULL;
319 AFFS_I(inode)->i_lc_size = 0;
320 AFFS_I(inode)->i_lc_shift = 0;
321 AFFS_I(inode)->i_lc_mask = 0;
322 AFFS_I(inode)->i_ac = NULL;
323 AFFS_I(inode)->i_ext_bh = NULL;
324 AFFS_I(inode)->mmu_private = 0;
325 AFFS_I(inode)->i_protect = 0;
326 AFFS_I(inode)->i_lastalloc = 0;
327 AFFS_I(inode)->i_pa_cnt = 0;
328 AFFS_I(inode)->i_extcnt = 1;
329 AFFS_I(inode)->i_ext_last = ~1;
330
331 insert_inode_hash(inode);
332
333 return inode;
334
335 err_bh:
336 affs_free_block(sb, block);
337 err_block:
338 iput(inode);
339 err_inode:
340 return NULL;
341 }
342
343 /*
344 * Add an entry to a directory. Create the header block
345 * and insert it into the hash table.
346 */
347
348 int
affs_add_entry(struct inode * dir,struct inode * inode,struct dentry * dentry,s32 type)349 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
350 {
351 struct super_block *sb = dir->i_sb;
352 struct buffer_head *inode_bh = NULL;
353 struct buffer_head *bh;
354 u32 block = 0;
355 int retval;
356
357 pr_debug("%s(dir=%llu, inode=%llu, \"%pd\", type=%d)\n", __func__,
358 dir->i_ino, inode->i_ino, dentry, type);
359
360 retval = -EIO;
361 bh = affs_bread(sb, inode->i_ino);
362 if (!bh)
363 goto done;
364
365 affs_lock_link(inode);
366 switch (type) {
367 case ST_LINKFILE:
368 case ST_LINKDIR:
369 retval = -ENOSPC;
370 block = affs_alloc_block(dir, dir->i_ino);
371 if (!block)
372 goto err;
373 retval = -EIO;
374 inode_bh = bh;
375 bh = affs_getzeroblk(sb, block);
376 if (!bh)
377 goto err;
378 break;
379 default:
380 break;
381 }
382
383 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
384 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
385 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
386 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
387 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
388
389 if (inode_bh) {
390 __be32 chain;
391 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
392 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
393 AFFS_TAIL(sb, bh)->link_chain = chain;
394 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
395 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
396 mmb_mark_buffer_dirty(inode_bh, &AFFS_I(inode)->i_metadata_bhs);
397 set_nlink(inode, 2);
398 ihold(inode);
399 }
400 affs_fix_checksum(sb, bh);
401 mmb_mark_buffer_dirty(bh, &AFFS_I(inode)->i_metadata_bhs);
402 dentry->d_fsdata = (void *)(long)bh->b_blocknr;
403
404 affs_lock_dir(dir);
405 retval = affs_insert_hash(dir, bh);
406 mmb_mark_buffer_dirty(bh, &AFFS_I(inode)->i_metadata_bhs);
407 affs_unlock_dir(dir);
408 affs_unlock_link(inode);
409
410 d_instantiate(dentry, inode);
411 done:
412 affs_brelse(inode_bh);
413 affs_brelse(bh);
414 return retval;
415 err:
416 if (block)
417 affs_free_block(sb, block);
418 affs_unlock_link(inode);
419 goto done;
420 }
421