2 * linux/fs/affs/amigaffs.c
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Amiga FFS filesystem.
8 * Please send bug reports to: hjw@zvw.de
13 extern struct timezone sys_tz;
15 static char ErrorBuffer[256];
18 * Functions for accessing Amiga-FFS structures.
22 /* Insert a header block bh into the directory dir
23 * caller must hold AFFS_DIR->i_hash_lock!
27 affs_insert_hash(struct inode *dir, struct buffer_head *bh)
29 struct super_block *sb = dir->i_sb;
30 struct buffer_head *dir_bh;
35 offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]);
37 pr_debug("AFFS: insert_hash(dir=%u, ino=%d)\n", (u32)dir->i_ino, ino);
39 dir_bh = affs_bread(sb, dir->i_ino);
43 hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]);
46 dir_bh = affs_bread(sb, hash_ino);
49 hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain);
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);
55 if (dir->i_ino == dir_bh->b_blocknr)
56 AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino);
58 AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino);
60 affs_adjust_checksum(dir_bh, ino);
61 mark_buffer_dirty_inode(dir_bh, dir);
64 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
66 mark_inode_dirty(dir);
71 /* Remove a header block from its directory.
72 * caller must hold AFFS_DIR->i_hash_lock!
76 affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh)
78 struct super_block *sb;
79 struct buffer_head *bh;
80 u32 rem_ino, hash_ino;
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);
89 bh = affs_bread(sb, dir->i_ino);
94 hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]);
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;
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;
109 bh = affs_bread(sb, hash_ino);
112 hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
117 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
119 mark_inode_dirty(dir);
125 affs_fix_dcache(struct inode *inode, u32 entry_ino)
127 struct dentry *dentry;
128 struct hlist_node *p;
129 spin_lock(&inode->i_lock);
130 hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
131 if (entry_ino == (u32)(long)dentry->d_fsdata) {
132 dentry->d_fsdata = (void *)inode->i_ino;
136 spin_unlock(&inode->i_lock);
140 /* Remove header from link chain */
143 affs_remove_link(struct dentry *dentry)
145 struct inode *dir, *inode = dentry->d_inode;
146 struct super_block *sb = inode->i_sb;
147 struct buffer_head *bh = NULL, *link_bh = NULL;
151 pr_debug("AFFS: remove_link(key=%ld)\n", inode->i_ino);
153 bh = affs_bread(sb, inode->i_ino);
157 link_ino = (u32)(long)dentry->d_fsdata;
158 if (inode->i_ino == link_ino) {
159 /* we can't remove the head of the link, as its blocknr is still used as ino,
160 * so we remove the block of the first link instead.
162 link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
163 link_bh = affs_bread(sb, link_ino);
167 dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
169 retval = PTR_ERR(dir);
175 * if there's a dentry for that block, make it
176 * refer to inode itself.
178 affs_fix_dcache(inode, link_ino);
179 retval = affs_remove_hash(dir, link_bh);
181 affs_unlock_dir(dir);
184 mark_buffer_dirty_inode(link_bh, inode);
186 memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
187 retval = affs_insert_hash(dir, bh);
189 affs_unlock_dir(dir);
192 mark_buffer_dirty_inode(bh, inode);
194 affs_unlock_dir(dir);
197 link_bh = affs_bread(sb, link_ino);
202 while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
203 if (ino == link_ino) {
204 __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
205 AFFS_TAIL(sb, bh)->link_chain = ino2;
206 affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
207 mark_buffer_dirty_inode(bh, inode);
209 /* Fix the link count, if bh is a normal header block without links */
210 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
215 if (!AFFS_TAIL(sb, bh)->link_chain)
218 affs_free_block(sb, link_ino);
222 bh = affs_bread(sb, ino);
228 affs_brelse(link_bh);
235 affs_empty_dir(struct inode *inode)
237 struct super_block *sb = inode->i_sb;
238 struct buffer_head *bh;
242 bh = affs_bread(sb, inode->i_ino);
247 for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--)
248 if (AFFS_HEAD(bh)->table[size])
258 /* Remove a filesystem object. If the object to be removed has
259 * links to it, one of the links must be changed to inherit
260 * the file or directory. As above, any inode will do.
261 * The buffer will not be freed. If the header is a link, the
262 * block will be marked as free.
263 * This function returns a negative error number in case of
264 * an error, else 0 if the inode is to be deleted or 1 if not.
268 affs_remove_header(struct dentry *dentry)
270 struct super_block *sb;
271 struct inode *inode, *dir;
272 struct buffer_head *bh = NULL;
275 dir = dentry->d_parent->d_inode;
279 inode = dentry->d_inode;
283 pr_debug("AFFS: remove_header(key=%ld)\n", inode->i_ino);
285 bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
289 affs_lock_link(inode);
291 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
293 /* if we ever want to support links to dirs
294 * i_hash_lock of the inode must only be
295 * taken after some checks
297 affs_lock_dir(inode);
298 retval = affs_empty_dir(inode);
299 affs_unlock_dir(inode);
307 retval = affs_remove_hash(dir, bh);
310 mark_buffer_dirty_inode(bh, inode);
312 affs_unlock_dir(dir);
314 if (inode->i_nlink > 1)
315 retval = affs_remove_link(dentry);
318 affs_unlock_link(inode);
319 inode->i_ctime = CURRENT_TIME_SEC;
320 mark_inode_dirty(inode);
327 affs_unlock_dir(dir);
328 affs_unlock_link(inode);
332 /* Checksum a block, do various consistency checks and optionally return
333 the blocks type number. DATA points to the block. If their pointers
334 are non-null, *PTYPE and *STYPE are set to the primary and secondary
335 block types respectively, *HASHSIZE is set to the size of the hashtable
336 (which lets us calculate the block size).
337 Returns non-zero if the block is not consistent. */
340 affs_checksum_block(struct super_block *sb, struct buffer_head *bh)
342 __be32 *ptr = (__be32 *)bh->b_data;
347 for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--)
348 sum += be32_to_cpu(*ptr++);
353 * Calculate the checksum of a disk block and store it
354 * at the indicated position.
358 affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
360 int cnt = sb->s_blocksize / sizeof(__be32);
361 __be32 *ptr = (__be32 *)bh->b_data;
365 checksumptr = ptr + 5;
367 for (checksum = 0; cnt > 0; ptr++, cnt--)
368 checksum += be32_to_cpu(*ptr);
369 *checksumptr = cpu_to_be32(-checksum);
373 secs_to_datestamp(time_t secs, struct affs_date *ds)
378 secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60);
382 secs -= days * 86400;
386 ds->days = cpu_to_be32(days);
387 ds->mins = cpu_to_be32(minute);
388 ds->ticks = cpu_to_be32(secs * 50);
392 prot_to_mode(u32 prot)
396 if (!(prot & FIBF_NOWRITE))
398 if (!(prot & FIBF_NOREAD))
400 if (!(prot & FIBF_NOEXECUTE))
402 if (prot & FIBF_GRP_WRITE)
404 if (prot & FIBF_GRP_READ)
406 if (prot & FIBF_GRP_EXECUTE)
408 if (prot & FIBF_OTR_WRITE)
410 if (prot & FIBF_OTR_READ)
412 if (prot & FIBF_OTR_EXECUTE)
419 mode_to_prot(struct inode *inode)
421 u32 prot = AFFS_I(inode)->i_protect;
422 umode_t mode = inode->i_mode;
424 if (!(mode & S_IXUSR))
425 prot |= FIBF_NOEXECUTE;
426 if (!(mode & S_IRUSR))
428 if (!(mode & S_IWUSR))
429 prot |= FIBF_NOWRITE;
431 prot |= FIBF_GRP_EXECUTE;
433 prot |= FIBF_GRP_READ;
435 prot |= FIBF_GRP_WRITE;
437 prot |= FIBF_OTR_EXECUTE;
439 prot |= FIBF_OTR_READ;
441 prot |= FIBF_OTR_WRITE;
443 AFFS_I(inode)->i_protect = prot;
447 affs_error(struct super_block *sb, const char *function, const char *fmt, ...)
452 vsnprintf(ErrorBuffer,sizeof(ErrorBuffer),fmt,args);
455 printk(KERN_CRIT "AFFS error (device %s): %s(): %s\n", sb->s_id,
456 function,ErrorBuffer);
457 if (!(sb->s_flags & MS_RDONLY))
458 printk(KERN_WARNING "AFFS: Remounting filesystem read-only\n");
459 sb->s_flags |= MS_RDONLY;
463 affs_warning(struct super_block *sb, const char *function, const char *fmt, ...)
468 vsnprintf(ErrorBuffer,sizeof(ErrorBuffer),fmt,args);
471 printk(KERN_WARNING "AFFS warning (device %s): %s(): %s\n", sb->s_id,
472 function,ErrorBuffer);
475 /* Check if the name is valid for a affs object. */
478 affs_check_name(const unsigned char *name, int len)
483 #ifdef AFFS_NO_TRUNCATE
484 return -ENAMETOOLONG;
489 for (i = 0; i < len; i++) {
490 if (name[i] < ' ' || name[i] == ':'
491 || (name[i] > 0x7e && name[i] < 0xa0))
498 /* This function copies name to bstr, with at most 30
499 * characters length. The bstr will be prepended by
501 * NOTE: The name will must be already checked by
506 affs_copy_name(unsigned char *bstr, struct dentry *dentry)
508 int len = min(dentry->d_name.len, 30u);
511 memcpy(bstr, dentry->d_name.name, len);