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1/*
2 * linux/fs/affs/amigaffs.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Amiga FFS filesystem.
7 *
8 * Please send bug reports to: hjw@zvw.de
9 */
10
11#include "affs.h"
12
13extern struct timezone sys_tz;
14
15static char ErrorBuffer[256];
16
17/*
18 * Functions for accessing Amiga-FFS structures.
19 */
20
21
22/* Insert a header block bh into the directory dir
23 * caller must hold AFFS_DIR->i_hash_lock!
24 */
25
26int
27affs_insert_hash(struct inode *dir, struct buffer_head *bh)
28{
29 struct super_block *sb = dir->i_sb;
30 struct buffer_head *dir_bh;
31 u32 ino, hash_ino;
32 int offset;
33
34 ino = bh->b_blocknr;
35 offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]);
36
37 pr_debug("AFFS: insert_hash(dir=%u, ino=%d)\n", (u32)dir->i_ino, ino);
38
39 dir_bh = affs_bread(sb, dir->i_ino);
40 if (!dir_bh)
41 return -EIO;
42
43 hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]);
44 while (hash_ino) {
45 affs_brelse(dir_bh);
46 dir_bh = affs_bread(sb, hash_ino);
47 if (!dir_bh)
48 return -EIO;
49 hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain);
50 }
51 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
52 AFFS_TAIL(sb, bh)->hash_chain = 0;
53 affs_fix_checksum(sb, bh);
54
55 if (dir->i_ino == dir_bh->b_blocknr)
56 AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino);
57 else
58 AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino);
59
60 affs_adjust_checksum(dir_bh, ino);
61 mark_buffer_dirty_inode(dir_bh, dir);
62 affs_brelse(dir_bh);
63
64 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
65 dir->i_version++;
66 mark_inode_dirty(dir);
67
68 return 0;
69}
70
71/* Remove a header block from its directory.
72 * caller must hold AFFS_DIR->i_hash_lock!
73 */
74
75int
76affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh)
77{
78 struct super_block *sb;
79 struct buffer_head *bh;
80 u32 rem_ino, hash_ino;
81 __be32 ino;
82 int offset, retval;
83
84 sb = dir->i_sb;
85 rem_ino = rem_bh->b_blocknr;
86 offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]);
87 pr_debug("AFFS: remove_hash(dir=%d, ino=%d, hashval=%d)\n", (u32)dir->i_ino, rem_ino, offset);
88
89 bh = affs_bread(sb, dir->i_ino);
90 if (!bh)
91 return -EIO;
92
93 retval = -ENOENT;
94 hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]);
95 while (hash_ino) {
96 if (hash_ino == rem_ino) {
97 ino = AFFS_TAIL(sb, rem_bh)->hash_chain;
98 if (dir->i_ino == bh->b_blocknr)
99 AFFS_HEAD(bh)->table[offset] = ino;
100 else
101 AFFS_TAIL(sb, bh)->hash_chain = ino;
102 affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino);
103 mark_buffer_dirty_inode(bh, dir);
104 AFFS_TAIL(sb, rem_bh)->parent = 0;
105 retval = 0;
106 break;
107 }
108 affs_brelse(bh);
109 bh = affs_bread(sb, hash_ino);
110 if (!bh)
111 return -EIO;
112 hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
113 }
114
115 affs_brelse(bh);
116
117 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
118 dir->i_version++;
119 mark_inode_dirty(dir);
120
121 return retval;
122}
123
124static void
125affs_fix_dcache(struct dentry *dentry, u32 entry_ino)
126{
127 struct inode *inode = dentry->d_inode;
128 void *data = dentry->d_fsdata;
129 struct list_head *head, *next;
130
131 spin_lock(&inode->i_lock);
132 head = &inode->i_dentry;
133 next = head->next;
134 while (next != head) {
135 dentry = list_entry(next, struct dentry, d_alias);
136 if (entry_ino == (u32)(long)dentry->d_fsdata) {
137 dentry->d_fsdata = data;
138 break;
139 }
140 next = next->next;
141 }
142 spin_unlock(&inode->i_lock);
143}
144
145
146/* Remove header from link chain */
147
148static int
149affs_remove_link(struct dentry *dentry)
150{
151 struct inode *dir, *inode = dentry->d_inode;
152 struct super_block *sb = inode->i_sb;
153 struct buffer_head *bh = NULL, *link_bh = NULL;
154 u32 link_ino, ino;
155 int retval;
156
157 pr_debug("AFFS: remove_link(key=%ld)\n", inode->i_ino);
158 retval = -EIO;
159 bh = affs_bread(sb, inode->i_ino);
160 if (!bh)
161 goto done;
162
163 link_ino = (u32)(long)dentry->d_fsdata;
164 if (inode->i_ino == link_ino) {
165 /* we can't remove the head of the link, as its blocknr is still used as ino,
166 * so we remove the block of the first link instead.
167 */
168 link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
169 link_bh = affs_bread(sb, link_ino);
170 if (!link_bh)
171 goto done;
172
173 dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
174 if (IS_ERR(dir)) {
175 retval = PTR_ERR(dir);
176 goto done;
177 }
178
179 affs_lock_dir(dir);
180 affs_fix_dcache(dentry, link_ino);
181 retval = affs_remove_hash(dir, link_bh);
182 if (retval) {
183 affs_unlock_dir(dir);
184 goto done;
185 }
186 mark_buffer_dirty_inode(link_bh, inode);
187
188 memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
189 retval = affs_insert_hash(dir, bh);
190 if (retval) {
191 affs_unlock_dir(dir);
192 goto done;
193 }
194 mark_buffer_dirty_inode(bh, inode);
195
196 affs_unlock_dir(dir);
197 iput(dir);
198 } else {
199 link_bh = affs_bread(sb, link_ino);
200 if (!link_bh)
201 goto done;
202 }
203
204 while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
205 if (ino == link_ino) {
206 __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
207 AFFS_TAIL(sb, bh)->link_chain = ino2;
208 affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
209 mark_buffer_dirty_inode(bh, inode);
210 retval = 0;
211 /* Fix the link count, if bh is a normal header block without links */
212 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
213 case ST_LINKDIR:
214 case ST_LINKFILE:
215 break;
216 default:
217 if (!AFFS_TAIL(sb, bh)->link_chain)
218 set_nlink(inode, 1);
219 }
220 affs_free_block(sb, link_ino);
221 goto done;
222 }
223 affs_brelse(bh);
224 bh = affs_bread(sb, ino);
225 if (!bh)
226 goto done;
227 }
228 retval = -ENOENT;
229done:
230 affs_brelse(link_bh);
231 affs_brelse(bh);
232 return retval;
233}
234
235
236static int
237affs_empty_dir(struct inode *inode)
238{
239 struct super_block *sb = inode->i_sb;
240 struct buffer_head *bh;
241 int retval, size;
242
243 retval = -EIO;
244 bh = affs_bread(sb, inode->i_ino);
245 if (!bh)
246 goto done;
247
248 retval = -ENOTEMPTY;
249 for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--)
250 if (AFFS_HEAD(bh)->table[size])
251 goto not_empty;
252 retval = 0;
253not_empty:
254 affs_brelse(bh);
255done:
256 return retval;
257}
258
259
260/* Remove a filesystem object. If the object to be removed has
261 * links to it, one of the links must be changed to inherit
262 * the file or directory. As above, any inode will do.
263 * The buffer will not be freed. If the header is a link, the
264 * block will be marked as free.
265 * This function returns a negative error number in case of
266 * an error, else 0 if the inode is to be deleted or 1 if not.
267 */
268
269int
270affs_remove_header(struct dentry *dentry)
271{
272 struct super_block *sb;
273 struct inode *inode, *dir;
274 struct buffer_head *bh = NULL;
275 int retval;
276
277 dir = dentry->d_parent->d_inode;
278 sb = dir->i_sb;
279
280 retval = -ENOENT;
281 inode = dentry->d_inode;
282 if (!inode)
283 goto done;
284
285 pr_debug("AFFS: remove_header(key=%ld)\n", inode->i_ino);
286 retval = -EIO;
287 bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
288 if (!bh)
289 goto done;
290
291 affs_lock_link(inode);
292 affs_lock_dir(dir);
293 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
294 case ST_USERDIR:
295 /* if we ever want to support links to dirs
296 * i_hash_lock of the inode must only be
297 * taken after some checks
298 */
299 affs_lock_dir(inode);
300 retval = affs_empty_dir(inode);
301 affs_unlock_dir(inode);
302 if (retval)
303 goto done_unlock;
304 break;
305 default:
306 break;
307 }
308
309 retval = affs_remove_hash(dir, bh);
310 if (retval)
311 goto done_unlock;
312 mark_buffer_dirty_inode(bh, inode);
313
314 affs_unlock_dir(dir);
315
316 if (inode->i_nlink > 1)
317 retval = affs_remove_link(dentry);
318 else
319 clear_nlink(inode);
320 affs_unlock_link(inode);
321 inode->i_ctime = CURRENT_TIME_SEC;
322 mark_inode_dirty(inode);
323
324done:
325 affs_brelse(bh);
326 return retval;
327
328done_unlock:
329 affs_unlock_dir(dir);
330 affs_unlock_link(inode);
331 goto done;
332}
333
334/* Checksum a block, do various consistency checks and optionally return
335 the blocks type number. DATA points to the block. If their pointers
336 are non-null, *PTYPE and *STYPE are set to the primary and secondary
337 block types respectively, *HASHSIZE is set to the size of the hashtable
338 (which lets us calculate the block size).
339 Returns non-zero if the block is not consistent. */
340
341u32
342affs_checksum_block(struct super_block *sb, struct buffer_head *bh)
343{
344 __be32 *ptr = (__be32 *)bh->b_data;
345 u32 sum;
346 int bsize;
347
348 sum = 0;
349 for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--)
350 sum += be32_to_cpu(*ptr++);
351 return sum;
352}
353
354/*
355 * Calculate the checksum of a disk block and store it
356 * at the indicated position.
357 */
358
359void
360affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
361{
362 int cnt = sb->s_blocksize / sizeof(__be32);
363 __be32 *ptr = (__be32 *)bh->b_data;
364 u32 checksum;
365 __be32 *checksumptr;
366
367 checksumptr = ptr + 5;
368 *checksumptr = 0;
369 for (checksum = 0; cnt > 0; ptr++, cnt--)
370 checksum += be32_to_cpu(*ptr);
371 *checksumptr = cpu_to_be32(-checksum);
372}
373
374void
375secs_to_datestamp(time_t secs, struct affs_date *ds)
376{
377 u32 days;
378 u32 minute;
379
380 secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60);
381 if (secs < 0)
382 secs = 0;
383 days = secs / 86400;
384 secs -= days * 86400;
385 minute = secs / 60;
386 secs -= minute * 60;
387
388 ds->days = cpu_to_be32(days);
389 ds->mins = cpu_to_be32(minute);
390 ds->ticks = cpu_to_be32(secs * 50);
391}
392
393umode_t
394prot_to_mode(u32 prot)
395{
396 umode_t mode = 0;
397
398 if (!(prot & FIBF_NOWRITE))
399 mode |= S_IWUSR;
400 if (!(prot & FIBF_NOREAD))
401 mode |= S_IRUSR;
402 if (!(prot & FIBF_NOEXECUTE))
403 mode |= S_IXUSR;
404 if (prot & FIBF_GRP_WRITE)
405 mode |= S_IWGRP;
406 if (prot & FIBF_GRP_READ)
407 mode |= S_IRGRP;
408 if (prot & FIBF_GRP_EXECUTE)
409 mode |= S_IXGRP;
410 if (prot & FIBF_OTR_WRITE)
411 mode |= S_IWOTH;
412 if (prot & FIBF_OTR_READ)
413 mode |= S_IROTH;
414 if (prot & FIBF_OTR_EXECUTE)
415 mode |= S_IXOTH;
416
417 return mode;
418}
419
420void
421mode_to_prot(struct inode *inode)
422{
423 u32 prot = AFFS_I(inode)->i_protect;
424 umode_t mode = inode->i_mode;
425
426 if (!(mode & S_IXUSR))
427 prot |= FIBF_NOEXECUTE;
428 if (!(mode & S_IRUSR))
429 prot |= FIBF_NOREAD;
430 if (!(mode & S_IWUSR))
431 prot |= FIBF_NOWRITE;
432 if (mode & S_IXGRP)
433 prot |= FIBF_GRP_EXECUTE;
434 if (mode & S_IRGRP)
435 prot |= FIBF_GRP_READ;
436 if (mode & S_IWGRP)
437 prot |= FIBF_GRP_WRITE;
438 if (mode & S_IXOTH)
439 prot |= FIBF_OTR_EXECUTE;
440 if (mode & S_IROTH)
441 prot |= FIBF_OTR_READ;
442 if (mode & S_IWOTH)
443 prot |= FIBF_OTR_WRITE;
444
445 AFFS_I(inode)->i_protect = prot;
446}
447
448void
449affs_error(struct super_block *sb, const char *function, const char *fmt, ...)
450{
451 va_list args;
452
453 va_start(args,fmt);
454 vsnprintf(ErrorBuffer,sizeof(ErrorBuffer),fmt,args);
455 va_end(args);
456
457 printk(KERN_CRIT "AFFS error (device %s): %s(): %s\n", sb->s_id,
458 function,ErrorBuffer);
459 if (!(sb->s_flags & MS_RDONLY))
460 printk(KERN_WARNING "AFFS: Remounting filesystem read-only\n");
461 sb->s_flags |= MS_RDONLY;
462}
463
464void
465affs_warning(struct super_block *sb, const char *function, const char *fmt, ...)
466{
467 va_list args;
468
469 va_start(args,fmt);
470 vsnprintf(ErrorBuffer,sizeof(ErrorBuffer),fmt,args);
471 va_end(args);
472
473 printk(KERN_WARNING "AFFS warning (device %s): %s(): %s\n", sb->s_id,
474 function,ErrorBuffer);
475}
476
477/* Check if the name is valid for a affs object. */
478
479int
480affs_check_name(const unsigned char *name, int len)
481{
482 int i;
483
484 if (len > 30)
485#ifdef AFFS_NO_TRUNCATE
486 return -ENAMETOOLONG;
487#else
488 len = 30;
489#endif
490
491 for (i = 0; i < len; i++) {
492 if (name[i] < ' ' || name[i] == ':'
493 || (name[i] > 0x7e && name[i] < 0xa0))
494 return -EINVAL;
495 }
496
497 return 0;
498}
499
500/* This function copies name to bstr, with at most 30
501 * characters length. The bstr will be prepended by
502 * a length byte.
503 * NOTE: The name will must be already checked by
504 * affs_check_name()!
505 */
506
507int
508affs_copy_name(unsigned char *bstr, struct dentry *dentry)
509{
510 int len = min(dentry->d_name.len, 30u);
511
512 *bstr++ = len;
513 memcpy(bstr, dentry->d_name.name, len);
514 return len;
515}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/affs/amigaffs.c
4 *
5 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 *
7 * (C) 1993 Ray Burr - Amiga FFS filesystem.
8 *
9 * Please send bug reports to: hjw@zvw.de
10 */
11
12#include <linux/math64.h>
13#include <linux/iversion.h>
14#include "affs.h"
15
16/*
17 * Functions for accessing Amiga-FFS structures.
18 */
19
20
21/* Insert a header block bh into the directory dir
22 * caller must hold AFFS_DIR->i_hash_lock!
23 */
24
25int
26affs_insert_hash(struct inode *dir, struct buffer_head *bh)
27{
28 struct super_block *sb = dir->i_sb;
29 struct buffer_head *dir_bh;
30 u32 ino, hash_ino;
31 int offset;
32
33 ino = bh->b_blocknr;
34 offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]);
35
36 pr_debug("%s(dir=%lu, ino=%d)\n", __func__, dir->i_ino, ino);
37
38 dir_bh = affs_bread(sb, dir->i_ino);
39 if (!dir_bh)
40 return -EIO;
41
42 hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]);
43 while (hash_ino) {
44 affs_brelse(dir_bh);
45 dir_bh = affs_bread(sb, hash_ino);
46 if (!dir_bh)
47 return -EIO;
48 hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain);
49 }
50 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
51 AFFS_TAIL(sb, bh)->hash_chain = 0;
52 affs_fix_checksum(sb, bh);
53
54 if (dir->i_ino == dir_bh->b_blocknr)
55 AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino);
56 else
57 AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino);
58
59 affs_adjust_checksum(dir_bh, ino);
60 mark_buffer_dirty_inode(dir_bh, dir);
61 affs_brelse(dir_bh);
62
63 dir->i_mtime = dir->i_ctime = current_time(dir);
64 inode_inc_iversion(dir);
65 mark_inode_dirty(dir);
66
67 return 0;
68}
69
70/* Remove a header block from its directory.
71 * caller must hold AFFS_DIR->i_hash_lock!
72 */
73
74int
75affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh)
76{
77 struct super_block *sb;
78 struct buffer_head *bh;
79 u32 rem_ino, hash_ino;
80 __be32 ino;
81 int offset, retval;
82
83 sb = dir->i_sb;
84 rem_ino = rem_bh->b_blocknr;
85 offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]);
86 pr_debug("%s(dir=%lu, ino=%d, hashval=%d)\n", __func__, dir->i_ino,
87 rem_ino, offset);
88
89 bh = affs_bread(sb, dir->i_ino);
90 if (!bh)
91 return -EIO;
92
93 retval = -ENOENT;
94 hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]);
95 while (hash_ino) {
96 if (hash_ino == rem_ino) {
97 ino = AFFS_TAIL(sb, rem_bh)->hash_chain;
98 if (dir->i_ino == bh->b_blocknr)
99 AFFS_HEAD(bh)->table[offset] = ino;
100 else
101 AFFS_TAIL(sb, bh)->hash_chain = ino;
102 affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino);
103 mark_buffer_dirty_inode(bh, dir);
104 AFFS_TAIL(sb, rem_bh)->parent = 0;
105 retval = 0;
106 break;
107 }
108 affs_brelse(bh);
109 bh = affs_bread(sb, hash_ino);
110 if (!bh)
111 return -EIO;
112 hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
113 }
114
115 affs_brelse(bh);
116
117 dir->i_mtime = dir->i_ctime = current_time(dir);
118 inode_inc_iversion(dir);
119 mark_inode_dirty(dir);
120
121 return retval;
122}
123
124static void
125affs_fix_dcache(struct inode *inode, u32 entry_ino)
126{
127 struct dentry *dentry;
128 spin_lock(&inode->i_lock);
129 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
130 if (entry_ino == (u32)(long)dentry->d_fsdata) {
131 dentry->d_fsdata = (void *)inode->i_ino;
132 break;
133 }
134 }
135 spin_unlock(&inode->i_lock);
136}
137
138
139/* Remove header from link chain */
140
141static int
142affs_remove_link(struct dentry *dentry)
143{
144 struct inode *dir, *inode = d_inode(dentry);
145 struct super_block *sb = inode->i_sb;
146 struct buffer_head *bh, *link_bh = NULL;
147 u32 link_ino, ino;
148 int retval;
149
150 pr_debug("%s(key=%ld)\n", __func__, inode->i_ino);
151 retval = -EIO;
152 bh = affs_bread(sb, inode->i_ino);
153 if (!bh)
154 goto done;
155
156 link_ino = (u32)(long)dentry->d_fsdata;
157 if (inode->i_ino == link_ino) {
158 /* we can't remove the head of the link, as its blocknr is still used as ino,
159 * so we remove the block of the first link instead.
160 */
161 link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
162 link_bh = affs_bread(sb, link_ino);
163 if (!link_bh)
164 goto done;
165
166 dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
167 if (IS_ERR(dir)) {
168 retval = PTR_ERR(dir);
169 goto done;
170 }
171
172 affs_lock_dir(dir);
173 /*
174 * if there's a dentry for that block, make it
175 * refer to inode itself.
176 */
177 affs_fix_dcache(inode, link_ino);
178 retval = affs_remove_hash(dir, link_bh);
179 if (retval) {
180 affs_unlock_dir(dir);
181 goto done;
182 }
183 mark_buffer_dirty_inode(link_bh, inode);
184
185 memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
186 retval = affs_insert_hash(dir, bh);
187 if (retval) {
188 affs_unlock_dir(dir);
189 goto done;
190 }
191 mark_buffer_dirty_inode(bh, inode);
192
193 affs_unlock_dir(dir);
194 iput(dir);
195 } else {
196 link_bh = affs_bread(sb, link_ino);
197 if (!link_bh)
198 goto done;
199 }
200
201 while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
202 if (ino == link_ino) {
203 __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
204 AFFS_TAIL(sb, bh)->link_chain = ino2;
205 affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
206 mark_buffer_dirty_inode(bh, inode);
207 retval = 0;
208 /* Fix the link count, if bh is a normal header block without links */
209 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
210 case ST_LINKDIR:
211 case ST_LINKFILE:
212 break;
213 default:
214 if (!AFFS_TAIL(sb, bh)->link_chain)
215 set_nlink(inode, 1);
216 }
217 affs_free_block(sb, link_ino);
218 goto done;
219 }
220 affs_brelse(bh);
221 bh = affs_bread(sb, ino);
222 if (!bh)
223 goto done;
224 }
225 retval = -ENOENT;
226done:
227 affs_brelse(link_bh);
228 affs_brelse(bh);
229 return retval;
230}
231
232
233static int
234affs_empty_dir(struct inode *inode)
235{
236 struct super_block *sb = inode->i_sb;
237 struct buffer_head *bh;
238 int retval, size;
239
240 retval = -EIO;
241 bh = affs_bread(sb, inode->i_ino);
242 if (!bh)
243 goto done;
244
245 retval = -ENOTEMPTY;
246 for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--)
247 if (AFFS_HEAD(bh)->table[size])
248 goto not_empty;
249 retval = 0;
250not_empty:
251 affs_brelse(bh);
252done:
253 return retval;
254}
255
256
257/* Remove a filesystem object. If the object to be removed has
258 * links to it, one of the links must be changed to inherit
259 * the file or directory. As above, any inode will do.
260 * The buffer will not be freed. If the header is a link, the
261 * block will be marked as free.
262 * This function returns a negative error number in case of
263 * an error, else 0 if the inode is to be deleted or 1 if not.
264 */
265
266int
267affs_remove_header(struct dentry *dentry)
268{
269 struct super_block *sb;
270 struct inode *inode, *dir;
271 struct buffer_head *bh = NULL;
272 int retval;
273
274 dir = d_inode(dentry->d_parent);
275 sb = dir->i_sb;
276
277 retval = -ENOENT;
278 inode = d_inode(dentry);
279 if (!inode)
280 goto done;
281
282 pr_debug("%s(key=%ld)\n", __func__, inode->i_ino);
283 retval = -EIO;
284 bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
285 if (!bh)
286 goto done;
287
288 affs_lock_link(inode);
289 affs_lock_dir(dir);
290 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
291 case ST_USERDIR:
292 /* if we ever want to support links to dirs
293 * i_hash_lock of the inode must only be
294 * taken after some checks
295 */
296 affs_lock_dir(inode);
297 retval = affs_empty_dir(inode);
298 affs_unlock_dir(inode);
299 if (retval)
300 goto done_unlock;
301 break;
302 default:
303 break;
304 }
305
306 retval = affs_remove_hash(dir, bh);
307 if (retval)
308 goto done_unlock;
309 mark_buffer_dirty_inode(bh, inode);
310
311 affs_unlock_dir(dir);
312
313 if (inode->i_nlink > 1)
314 retval = affs_remove_link(dentry);
315 else
316 clear_nlink(inode);
317 affs_unlock_link(inode);
318 inode->i_ctime = current_time(inode);
319 mark_inode_dirty(inode);
320
321done:
322 affs_brelse(bh);
323 return retval;
324
325done_unlock:
326 affs_unlock_dir(dir);
327 affs_unlock_link(inode);
328 goto done;
329}
330
331/* Checksum a block, do various consistency checks and optionally return
332 the blocks type number. DATA points to the block. If their pointers
333 are non-null, *PTYPE and *STYPE are set to the primary and secondary
334 block types respectively, *HASHSIZE is set to the size of the hashtable
335 (which lets us calculate the block size).
336 Returns non-zero if the block is not consistent. */
337
338u32
339affs_checksum_block(struct super_block *sb, struct buffer_head *bh)
340{
341 __be32 *ptr = (__be32 *)bh->b_data;
342 u32 sum;
343 int bsize;
344
345 sum = 0;
346 for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--)
347 sum += be32_to_cpu(*ptr++);
348 return sum;
349}
350
351/*
352 * Calculate the checksum of a disk block and store it
353 * at the indicated position.
354 */
355
356void
357affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
358{
359 int cnt = sb->s_blocksize / sizeof(__be32);
360 __be32 *ptr = (__be32 *)bh->b_data;
361 u32 checksum;
362 __be32 *checksumptr;
363
364 checksumptr = ptr + 5;
365 *checksumptr = 0;
366 for (checksum = 0; cnt > 0; ptr++, cnt--)
367 checksum += be32_to_cpu(*ptr);
368 *checksumptr = cpu_to_be32(-checksum);
369}
370
371void
372affs_secs_to_datestamp(time64_t secs, struct affs_date *ds)
373{
374 u32 days;
375 u32 minute;
376 s32 rem;
377
378 secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60);
379 if (secs < 0)
380 secs = 0;
381 days = div_s64_rem(secs, 86400, &rem);
382 minute = rem / 60;
383 rem -= minute * 60;
384
385 ds->days = cpu_to_be32(days);
386 ds->mins = cpu_to_be32(minute);
387 ds->ticks = cpu_to_be32(rem * 50);
388}
389
390umode_t
391affs_prot_to_mode(u32 prot)
392{
393 umode_t mode = 0;
394
395 if (!(prot & FIBF_NOWRITE))
396 mode |= 0200;
397 if (!(prot & FIBF_NOREAD))
398 mode |= 0400;
399 if (!(prot & FIBF_NOEXECUTE))
400 mode |= 0100;
401 if (prot & FIBF_GRP_WRITE)
402 mode |= 0020;
403 if (prot & FIBF_GRP_READ)
404 mode |= 0040;
405 if (prot & FIBF_GRP_EXECUTE)
406 mode |= 0010;
407 if (prot & FIBF_OTR_WRITE)
408 mode |= 0002;
409 if (prot & FIBF_OTR_READ)
410 mode |= 0004;
411 if (prot & FIBF_OTR_EXECUTE)
412 mode |= 0001;
413
414 return mode;
415}
416
417void
418affs_mode_to_prot(struct inode *inode)
419{
420 u32 prot = AFFS_I(inode)->i_protect;
421 umode_t mode = inode->i_mode;
422
423 if (!(mode & 0100))
424 prot |= FIBF_NOEXECUTE;
425 if (!(mode & 0400))
426 prot |= FIBF_NOREAD;
427 if (!(mode & 0200))
428 prot |= FIBF_NOWRITE;
429 if (mode & 0010)
430 prot |= FIBF_GRP_EXECUTE;
431 if (mode & 0040)
432 prot |= FIBF_GRP_READ;
433 if (mode & 0020)
434 prot |= FIBF_GRP_WRITE;
435 if (mode & 0001)
436 prot |= FIBF_OTR_EXECUTE;
437 if (mode & 0004)
438 prot |= FIBF_OTR_READ;
439 if (mode & 0002)
440 prot |= FIBF_OTR_WRITE;
441
442 AFFS_I(inode)->i_protect = prot;
443}
444
445void
446affs_error(struct super_block *sb, const char *function, const char *fmt, ...)
447{
448 struct va_format vaf;
449 va_list args;
450
451 va_start(args, fmt);
452 vaf.fmt = fmt;
453 vaf.va = &args;
454 pr_crit("error (device %s): %s(): %pV\n", sb->s_id, function, &vaf);
455 if (!sb_rdonly(sb))
456 pr_warn("Remounting filesystem read-only\n");
457 sb->s_flags |= SB_RDONLY;
458 va_end(args);
459}
460
461void
462affs_warning(struct super_block *sb, const char *function, const char *fmt, ...)
463{
464 struct va_format vaf;
465 va_list args;
466
467 va_start(args, fmt);
468 vaf.fmt = fmt;
469 vaf.va = &args;
470 pr_warn("(device %s): %s(): %pV\n", sb->s_id, function, &vaf);
471 va_end(args);
472}
473
474bool
475affs_nofilenametruncate(const struct dentry *dentry)
476{
477 return affs_test_opt(AFFS_SB(dentry->d_sb)->s_flags, SF_NO_TRUNCATE);
478}
479
480/* Check if the name is valid for a affs object. */
481
482int
483affs_check_name(const unsigned char *name, int len, bool notruncate)
484{
485 int i;
486
487 if (len > AFFSNAMEMAX) {
488 if (notruncate)
489 return -ENAMETOOLONG;
490 len = AFFSNAMEMAX;
491 }
492 for (i = 0; i < len; i++) {
493 if (name[i] < ' ' || name[i] == ':'
494 || (name[i] > 0x7e && name[i] < 0xa0))
495 return -EINVAL;
496 }
497
498 return 0;
499}
500
501/* This function copies name to bstr, with at most 30
502 * characters length. The bstr will be prepended by
503 * a length byte.
504 * NOTE: The name will must be already checked by
505 * affs_check_name()!
506 */
507
508int
509affs_copy_name(unsigned char *bstr, struct dentry *dentry)
510{
511 u32 len = min(dentry->d_name.len, AFFSNAMEMAX);
512
513 *bstr++ = len;
514 memcpy(bstr, dentry->d_name.name, len);
515 return len;
516}